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Linux/fs/ocfs2/xattr.c

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * xattr.c
  5  *
  6  * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
  7  *
  8  * CREDITS:
  9  * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
 10  * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
 11  *
 12  * This program is free software; you can redistribute it and/or
 13  * modify it under the terms of the GNU General Public
 14  * License version 2 as published by the Free Software Foundation.
 15  *
 16  * This program is distributed in the hope that it will be useful,
 17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 19  * General Public License for more details.
 20  */
 21 
 22 #include <linux/capability.h>
 23 #include <linux/fs.h>
 24 #include <linux/types.h>
 25 #include <linux/slab.h>
 26 #include <linux/highmem.h>
 27 #include <linux/pagemap.h>
 28 #include <linux/uio.h>
 29 #include <linux/sched.h>
 30 #include <linux/splice.h>
 31 #include <linux/mount.h>
 32 #include <linux/writeback.h>
 33 #include <linux/falloc.h>
 34 #include <linux/sort.h>
 35 #include <linux/init.h>
 36 #include <linux/module.h>
 37 #include <linux/string.h>
 38 #include <linux/security.h>
 39 
 40 #include <cluster/masklog.h>
 41 
 42 #include "ocfs2.h"
 43 #include "alloc.h"
 44 #include "blockcheck.h"
 45 #include "dlmglue.h"
 46 #include "file.h"
 47 #include "symlink.h"
 48 #include "sysfile.h"
 49 #include "inode.h"
 50 #include "journal.h"
 51 #include "ocfs2_fs.h"
 52 #include "suballoc.h"
 53 #include "uptodate.h"
 54 #include "buffer_head_io.h"
 55 #include "super.h"
 56 #include "xattr.h"
 57 #include "refcounttree.h"
 58 #include "acl.h"
 59 #include "ocfs2_trace.h"
 60 
 61 struct ocfs2_xattr_def_value_root {
 62         struct ocfs2_xattr_value_root   xv;
 63         struct ocfs2_extent_rec         er;
 64 };
 65 
 66 struct ocfs2_xattr_bucket {
 67         /* The inode these xattrs are associated with */
 68         struct inode *bu_inode;
 69 
 70         /* The actual buffers that make up the bucket */
 71         struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
 72 
 73         /* How many blocks make up one bucket for this filesystem */
 74         int bu_blocks;
 75 };
 76 
 77 struct ocfs2_xattr_set_ctxt {
 78         handle_t *handle;
 79         struct ocfs2_alloc_context *meta_ac;
 80         struct ocfs2_alloc_context *data_ac;
 81         struct ocfs2_cached_dealloc_ctxt dealloc;
 82         int set_abort;
 83 };
 84 
 85 #define OCFS2_XATTR_ROOT_SIZE   (sizeof(struct ocfs2_xattr_def_value_root))
 86 #define OCFS2_XATTR_INLINE_SIZE 80
 87 #define OCFS2_XATTR_HEADER_GAP  4
 88 #define OCFS2_XATTR_FREE_IN_IBODY       (OCFS2_MIN_XATTR_INLINE_SIZE \
 89                                          - sizeof(struct ocfs2_xattr_header) \
 90                                          - OCFS2_XATTR_HEADER_GAP)
 91 #define OCFS2_XATTR_FREE_IN_BLOCK(ptr)  ((ptr)->i_sb->s_blocksize \
 92                                          - sizeof(struct ocfs2_xattr_block) \
 93                                          - sizeof(struct ocfs2_xattr_header) \
 94                                          - OCFS2_XATTR_HEADER_GAP)
 95 
 96 static struct ocfs2_xattr_def_value_root def_xv = {
 97         .xv.xr_list.l_count = cpu_to_le16(1),
 98 };
 99 
100 const struct xattr_handler *ocfs2_xattr_handlers[] = {
101         &ocfs2_xattr_user_handler,
102         &posix_acl_access_xattr_handler,
103         &posix_acl_default_xattr_handler,
104         &ocfs2_xattr_trusted_handler,
105         &ocfs2_xattr_security_handler,
106         NULL
107 };
108 
109 static const struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
110         [OCFS2_XATTR_INDEX_USER]        = &ocfs2_xattr_user_handler,
111         [OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
112                                         = &posix_acl_access_xattr_handler,
113         [OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
114                                         = &posix_acl_default_xattr_handler,
115         [OCFS2_XATTR_INDEX_TRUSTED]     = &ocfs2_xattr_trusted_handler,
116         [OCFS2_XATTR_INDEX_SECURITY]    = &ocfs2_xattr_security_handler,
117 };
118 
119 struct ocfs2_xattr_info {
120         int             xi_name_index;
121         const char      *xi_name;
122         int             xi_name_len;
123         const void      *xi_value;
124         size_t          xi_value_len;
125 };
126 
127 struct ocfs2_xattr_search {
128         struct buffer_head *inode_bh;
129         /*
130          * xattr_bh point to the block buffer head which has extended attribute
131          * when extended attribute in inode, xattr_bh is equal to inode_bh.
132          */
133         struct buffer_head *xattr_bh;
134         struct ocfs2_xattr_header *header;
135         struct ocfs2_xattr_bucket *bucket;
136         void *base;
137         void *end;
138         struct ocfs2_xattr_entry *here;
139         int not_found;
140 };
141 
142 /* Operations on struct ocfs2_xa_entry */
143 struct ocfs2_xa_loc;
144 struct ocfs2_xa_loc_operations {
145         /*
146          * Journal functions
147          */
148         int (*xlo_journal_access)(handle_t *handle, struct ocfs2_xa_loc *loc,
149                                   int type);
150         void (*xlo_journal_dirty)(handle_t *handle, struct ocfs2_xa_loc *loc);
151 
152         /*
153          * Return a pointer to the appropriate buffer in loc->xl_storage
154          * at the given offset from loc->xl_header.
155          */
156         void *(*xlo_offset_pointer)(struct ocfs2_xa_loc *loc, int offset);
157 
158         /* Can we reuse the existing entry for the new value? */
159         int (*xlo_can_reuse)(struct ocfs2_xa_loc *loc,
160                              struct ocfs2_xattr_info *xi);
161 
162         /* How much space is needed for the new value? */
163         int (*xlo_check_space)(struct ocfs2_xa_loc *loc,
164                                struct ocfs2_xattr_info *xi);
165 
166         /*
167          * Return the offset of the first name+value pair.  This is
168          * the start of our downward-filling free space.
169          */
170         int (*xlo_get_free_start)(struct ocfs2_xa_loc *loc);
171 
172         /*
173          * Remove the name+value at this location.  Do whatever is
174          * appropriate with the remaining name+value pairs.
175          */
176         void (*xlo_wipe_namevalue)(struct ocfs2_xa_loc *loc);
177 
178         /* Fill xl_entry with a new entry */
179         void (*xlo_add_entry)(struct ocfs2_xa_loc *loc, u32 name_hash);
180 
181         /* Add name+value storage to an entry */
182         void (*xlo_add_namevalue)(struct ocfs2_xa_loc *loc, int size);
183 
184         /*
185          * Initialize the value buf's access and bh fields for this entry.
186          * ocfs2_xa_fill_value_buf() will handle the xv pointer.
187          */
188         void (*xlo_fill_value_buf)(struct ocfs2_xa_loc *loc,
189                                    struct ocfs2_xattr_value_buf *vb);
190 };
191 
192 /*
193  * Describes an xattr entry location.  This is a memory structure
194  * tracking the on-disk structure.
195  */
196 struct ocfs2_xa_loc {
197         /* This xattr belongs to this inode */
198         struct inode *xl_inode;
199 
200         /* The ocfs2_xattr_header inside the on-disk storage. Not NULL. */
201         struct ocfs2_xattr_header *xl_header;
202 
203         /* Bytes from xl_header to the end of the storage */
204         int xl_size;
205 
206         /*
207          * The ocfs2_xattr_entry this location describes.  If this is
208          * NULL, this location describes the on-disk structure where it
209          * would have been.
210          */
211         struct ocfs2_xattr_entry *xl_entry;
212 
213         /*
214          * Internal housekeeping
215          */
216 
217         /* Buffer(s) containing this entry */
218         void *xl_storage;
219 
220         /* Operations on the storage backing this location */
221         const struct ocfs2_xa_loc_operations *xl_ops;
222 };
223 
224 /*
225  * Convenience functions to calculate how much space is needed for a
226  * given name+value pair
227  */
228 static int namevalue_size(int name_len, uint64_t value_len)
229 {
230         if (value_len > OCFS2_XATTR_INLINE_SIZE)
231                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
232         else
233                 return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
234 }
235 
236 static int namevalue_size_xi(struct ocfs2_xattr_info *xi)
237 {
238         return namevalue_size(xi->xi_name_len, xi->xi_value_len);
239 }
240 
241 static int namevalue_size_xe(struct ocfs2_xattr_entry *xe)
242 {
243         u64 value_len = le64_to_cpu(xe->xe_value_size);
244 
245         BUG_ON((value_len > OCFS2_XATTR_INLINE_SIZE) &&
246                ocfs2_xattr_is_local(xe));
247         return namevalue_size(xe->xe_name_len, value_len);
248 }
249 
250 
251 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
252                                              struct ocfs2_xattr_header *xh,
253                                              int index,
254                                              int *block_off,
255                                              int *new_offset);
256 
257 static int ocfs2_xattr_block_find(struct inode *inode,
258                                   int name_index,
259                                   const char *name,
260                                   struct ocfs2_xattr_search *xs);
261 static int ocfs2_xattr_index_block_find(struct inode *inode,
262                                         struct buffer_head *root_bh,
263                                         int name_index,
264                                         const char *name,
265                                         struct ocfs2_xattr_search *xs);
266 
267 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
268                                         struct buffer_head *blk_bh,
269                                         char *buffer,
270                                         size_t buffer_size);
271 
272 static int ocfs2_xattr_create_index_block(struct inode *inode,
273                                           struct ocfs2_xattr_search *xs,
274                                           struct ocfs2_xattr_set_ctxt *ctxt);
275 
276 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
277                                              struct ocfs2_xattr_info *xi,
278                                              struct ocfs2_xattr_search *xs,
279                                              struct ocfs2_xattr_set_ctxt *ctxt);
280 
281 typedef int (xattr_tree_rec_func)(struct inode *inode,
282                                   struct buffer_head *root_bh,
283                                   u64 blkno, u32 cpos, u32 len, void *para);
284 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
285                                            struct buffer_head *root_bh,
286                                            xattr_tree_rec_func *rec_func,
287                                            void *para);
288 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
289                                         struct ocfs2_xattr_bucket *bucket,
290                                         void *para);
291 static int ocfs2_rm_xattr_cluster(struct inode *inode,
292                                   struct buffer_head *root_bh,
293                                   u64 blkno,
294                                   u32 cpos,
295                                   u32 len,
296                                   void *para);
297 
298 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
299                                   u64 src_blk, u64 last_blk, u64 to_blk,
300                                   unsigned int start_bucket,
301                                   u32 *first_hash);
302 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
303                                         struct ocfs2_dinode *di,
304                                         struct ocfs2_xattr_info *xi,
305                                         struct ocfs2_xattr_search *xis,
306                                         struct ocfs2_xattr_search *xbs,
307                                         struct ocfs2_refcount_tree **ref_tree,
308                                         int *meta_need,
309                                         int *credits);
310 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
311                                            struct ocfs2_xattr_bucket *bucket,
312                                            int offset,
313                                            struct ocfs2_xattr_value_root **xv,
314                                            struct buffer_head **bh);
315 
316 static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
317 {
318         return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
319 }
320 
321 static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
322 {
323         return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
324 }
325 
326 #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
327 #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
328 #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
329 
330 static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
331 {
332         struct ocfs2_xattr_bucket *bucket;
333         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
334 
335         BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
336 
337         bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
338         if (bucket) {
339                 bucket->bu_inode = inode;
340                 bucket->bu_blocks = blks;
341         }
342 
343         return bucket;
344 }
345 
346 static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
347 {
348         int i;
349 
350         for (i = 0; i < bucket->bu_blocks; i++) {
351                 brelse(bucket->bu_bhs[i]);
352                 bucket->bu_bhs[i] = NULL;
353         }
354 }
355 
356 static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
357 {
358         if (bucket) {
359                 ocfs2_xattr_bucket_relse(bucket);
360                 bucket->bu_inode = NULL;
361                 kfree(bucket);
362         }
363 }
364 
365 /*
366  * A bucket that has never been written to disk doesn't need to be
367  * read.  We just need the buffer_heads.  Don't call this for
368  * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
369  * them fully.
370  */
371 static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
372                                    u64 xb_blkno, int new)
373 {
374         int i, rc = 0;
375 
376         for (i = 0; i < bucket->bu_blocks; i++) {
377                 bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
378                                               xb_blkno + i);
379                 if (!bucket->bu_bhs[i]) {
380                         rc = -ENOMEM;
381                         mlog_errno(rc);
382                         break;
383                 }
384 
385                 if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
386                                            bucket->bu_bhs[i])) {
387                         if (new)
388                                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
389                                                               bucket->bu_bhs[i]);
390                         else {
391                                 set_buffer_uptodate(bucket->bu_bhs[i]);
392                                 ocfs2_set_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
393                                                           bucket->bu_bhs[i]);
394                         }
395                 }
396         }
397 
398         if (rc)
399                 ocfs2_xattr_bucket_relse(bucket);
400         return rc;
401 }
402 
403 /* Read the xattr bucket at xb_blkno */
404 static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
405                                    u64 xb_blkno)
406 {
407         int rc;
408 
409         rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
410                                bucket->bu_blocks, bucket->bu_bhs, 0,
411                                NULL);
412         if (!rc) {
413                 spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
414                 rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
415                                                  bucket->bu_bhs,
416                                                  bucket->bu_blocks,
417                                                  &bucket_xh(bucket)->xh_check);
418                 spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
419                 if (rc)
420                         mlog_errno(rc);
421         }
422 
423         if (rc)
424                 ocfs2_xattr_bucket_relse(bucket);
425         return rc;
426 }
427 
428 static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
429                                              struct ocfs2_xattr_bucket *bucket,
430                                              int type)
431 {
432         int i, rc = 0;
433 
434         for (i = 0; i < bucket->bu_blocks; i++) {
435                 rc = ocfs2_journal_access(handle,
436                                           INODE_CACHE(bucket->bu_inode),
437                                           bucket->bu_bhs[i], type);
438                 if (rc) {
439                         mlog_errno(rc);
440                         break;
441                 }
442         }
443 
444         return rc;
445 }
446 
447 static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
448                                              struct ocfs2_xattr_bucket *bucket)
449 {
450         int i;
451 
452         spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
453         ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
454                                    bucket->bu_bhs, bucket->bu_blocks,
455                                    &bucket_xh(bucket)->xh_check);
456         spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
457 
458         for (i = 0; i < bucket->bu_blocks; i++)
459                 ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
460 }
461 
462 static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
463                                          struct ocfs2_xattr_bucket *src)
464 {
465         int i;
466         int blocksize = src->bu_inode->i_sb->s_blocksize;
467 
468         BUG_ON(dest->bu_blocks != src->bu_blocks);
469         BUG_ON(dest->bu_inode != src->bu_inode);
470 
471         for (i = 0; i < src->bu_blocks; i++) {
472                 memcpy(bucket_block(dest, i), bucket_block(src, i),
473                        blocksize);
474         }
475 }
476 
477 static int ocfs2_validate_xattr_block(struct super_block *sb,
478                                       struct buffer_head *bh)
479 {
480         int rc;
481         struct ocfs2_xattr_block *xb =
482                 (struct ocfs2_xattr_block *)bh->b_data;
483 
484         trace_ocfs2_validate_xattr_block((unsigned long long)bh->b_blocknr);
485 
486         BUG_ON(!buffer_uptodate(bh));
487 
488         /*
489          * If the ecc fails, we return the error but otherwise
490          * leave the filesystem running.  We know any error is
491          * local to this block.
492          */
493         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
494         if (rc)
495                 return rc;
496 
497         /*
498          * Errors after here are fatal
499          */
500 
501         if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
502                 ocfs2_error(sb,
503                             "Extended attribute block #%llu has bad "
504                             "signature %.*s",
505                             (unsigned long long)bh->b_blocknr, 7,
506                             xb->xb_signature);
507                 return -EINVAL;
508         }
509 
510         if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
511                 ocfs2_error(sb,
512                             "Extended attribute block #%llu has an "
513                             "invalid xb_blkno of %llu",
514                             (unsigned long long)bh->b_blocknr,
515                             (unsigned long long)le64_to_cpu(xb->xb_blkno));
516                 return -EINVAL;
517         }
518 
519         if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
520                 ocfs2_error(sb,
521                             "Extended attribute block #%llu has an invalid "
522                             "xb_fs_generation of #%u",
523                             (unsigned long long)bh->b_blocknr,
524                             le32_to_cpu(xb->xb_fs_generation));
525                 return -EINVAL;
526         }
527 
528         return 0;
529 }
530 
531 static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
532                                   struct buffer_head **bh)
533 {
534         int rc;
535         struct buffer_head *tmp = *bh;
536 
537         rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
538                               ocfs2_validate_xattr_block);
539 
540         /* If ocfs2_read_block() got us a new bh, pass it up. */
541         if (!rc && !*bh)
542                 *bh = tmp;
543 
544         return rc;
545 }
546 
547 static inline const char *ocfs2_xattr_prefix(int name_index)
548 {
549         const struct xattr_handler *handler = NULL;
550 
551         if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
552                 handler = ocfs2_xattr_handler_map[name_index];
553 
554         return handler ? handler->prefix : NULL;
555 }
556 
557 static u32 ocfs2_xattr_name_hash(struct inode *inode,
558                                  const char *name,
559                                  int name_len)
560 {
561         /* Get hash value of uuid from super block */
562         u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
563         int i;
564 
565         /* hash extended attribute name */
566         for (i = 0; i < name_len; i++) {
567                 hash = (hash << OCFS2_HASH_SHIFT) ^
568                        (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
569                        *name++;
570         }
571 
572         return hash;
573 }
574 
575 static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
576 {
577         return namevalue_size(name_len, value_len) +
578                 sizeof(struct ocfs2_xattr_entry);
579 }
580 
581 static int ocfs2_xi_entry_usage(struct ocfs2_xattr_info *xi)
582 {
583         return namevalue_size_xi(xi) +
584                 sizeof(struct ocfs2_xattr_entry);
585 }
586 
587 static int ocfs2_xe_entry_usage(struct ocfs2_xattr_entry *xe)
588 {
589         return namevalue_size_xe(xe) +
590                 sizeof(struct ocfs2_xattr_entry);
591 }
592 
593 int ocfs2_calc_security_init(struct inode *dir,
594                              struct ocfs2_security_xattr_info *si,
595                              int *want_clusters,
596                              int *xattr_credits,
597                              struct ocfs2_alloc_context **xattr_ac)
598 {
599         int ret = 0;
600         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
601         int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
602                                                  si->value_len);
603 
604         /*
605          * The max space of security xattr taken inline is
606          * 256(name) + 80(value) + 16(entry) = 352 bytes,
607          * So reserve one metadata block for it is ok.
608          */
609         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
610             s_size > OCFS2_XATTR_FREE_IN_IBODY) {
611                 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
612                 if (ret) {
613                         mlog_errno(ret);
614                         return ret;
615                 }
616                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
617         }
618 
619         /* reserve clusters for xattr value which will be set in B tree*/
620         if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
621                 int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
622                                                             si->value_len);
623 
624                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
625                                                            new_clusters);
626                 *want_clusters += new_clusters;
627         }
628         return ret;
629 }
630 
631 int ocfs2_calc_xattr_init(struct inode *dir,
632                           struct buffer_head *dir_bh,
633                           umode_t mode,
634                           struct ocfs2_security_xattr_info *si,
635                           int *want_clusters,
636                           int *xattr_credits,
637                           int *want_meta)
638 {
639         int ret = 0;
640         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
641         int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
642 
643         if (si->enable)
644                 s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
645                                                      si->value_len);
646 
647         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
648                 acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
649                                         OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
650                                         "", NULL, 0);
651                 if (acl_len > 0) {
652                         a_size = ocfs2_xattr_entry_real_size(0, acl_len);
653                         if (S_ISDIR(mode))
654                                 a_size <<= 1;
655                 } else if (acl_len != 0 && acl_len != -ENODATA) {
656                         mlog_errno(ret);
657                         return ret;
658                 }
659         }
660 
661         if (!(s_size + a_size))
662                 return ret;
663 
664         /*
665          * The max space of security xattr taken inline is
666          * 256(name) + 80(value) + 16(entry) = 352 bytes,
667          * The max space of acl xattr taken inline is
668          * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
669          * when blocksize = 512, may reserve one more cluser for
670          * xattr bucket, otherwise reserve one metadata block
671          * for them is ok.
672          * If this is a new directory with inline data,
673          * we choose to reserve the entire inline area for
674          * directory contents and force an external xattr block.
675          */
676         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
677             (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
678             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
679                 *want_meta = *want_meta + 1;
680                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
681         }
682 
683         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
684             (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
685                 *want_clusters += 1;
686                 *xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
687         }
688 
689         /*
690          * reserve credits and clusters for xattrs which has large value
691          * and have to be set outside
692          */
693         if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
694                 new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
695                                                         si->value_len);
696                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
697                                                            new_clusters);
698                 *want_clusters += new_clusters;
699         }
700         if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
701             acl_len > OCFS2_XATTR_INLINE_SIZE) {
702                 /* for directory, it has DEFAULT and ACCESS two types of acls */
703                 new_clusters = (S_ISDIR(mode) ? 2 : 1) *
704                                 ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
705                 *xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
706                                                            new_clusters);
707                 *want_clusters += new_clusters;
708         }
709 
710         return ret;
711 }
712 
713 static int ocfs2_xattr_extend_allocation(struct inode *inode,
714                                          u32 clusters_to_add,
715                                          struct ocfs2_xattr_value_buf *vb,
716                                          struct ocfs2_xattr_set_ctxt *ctxt)
717 {
718         int status = 0, credits;
719         handle_t *handle = ctxt->handle;
720         enum ocfs2_alloc_restarted why;
721         u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
722         struct ocfs2_extent_tree et;
723 
724         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
725 
726         while (clusters_to_add) {
727                 trace_ocfs2_xattr_extend_allocation(clusters_to_add);
728 
729                 status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
730                                        OCFS2_JOURNAL_ACCESS_WRITE);
731                 if (status < 0) {
732                         mlog_errno(status);
733                         break;
734                 }
735 
736                 prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
737                 status = ocfs2_add_clusters_in_btree(handle,
738                                                      &et,
739                                                      &logical_start,
740                                                      clusters_to_add,
741                                                      0,
742                                                      ctxt->data_ac,
743                                                      ctxt->meta_ac,
744                                                      &why);
745                 if ((status < 0) && (status != -EAGAIN)) {
746                         if (status != -ENOSPC)
747                                 mlog_errno(status);
748                         break;
749                 }
750 
751                 ocfs2_journal_dirty(handle, vb->vb_bh);
752 
753                 clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) -
754                                          prev_clusters;
755 
756                 if (why != RESTART_NONE && clusters_to_add) {
757                         /*
758                          * We can only fail in case the alloc file doesn't give
759                          * up enough clusters.
760                          */
761                         BUG_ON(why == RESTART_META);
762 
763                         credits = ocfs2_calc_extend_credits(inode->i_sb,
764                                                             &vb->vb_xv->xr_list);
765                         status = ocfs2_extend_trans(handle, credits);
766                         if (status < 0) {
767                                 status = -ENOMEM;
768                                 mlog_errno(status);
769                                 break;
770                         }
771                 }
772         }
773 
774         return status;
775 }
776 
777 static int __ocfs2_remove_xattr_range(struct inode *inode,
778                                       struct ocfs2_xattr_value_buf *vb,
779                                       u32 cpos, u32 phys_cpos, u32 len,
780                                       unsigned int ext_flags,
781                                       struct ocfs2_xattr_set_ctxt *ctxt)
782 {
783         int ret;
784         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
785         handle_t *handle = ctxt->handle;
786         struct ocfs2_extent_tree et;
787 
788         ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
789 
790         ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
791                             OCFS2_JOURNAL_ACCESS_WRITE);
792         if (ret) {
793                 mlog_errno(ret);
794                 goto out;
795         }
796 
797         ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
798                                   &ctxt->dealloc);
799         if (ret) {
800                 mlog_errno(ret);
801                 goto out;
802         }
803 
804         le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
805         ocfs2_journal_dirty(handle, vb->vb_bh);
806 
807         if (ext_flags & OCFS2_EXT_REFCOUNTED)
808                 ret = ocfs2_decrease_refcount(inode, handle,
809                                         ocfs2_blocks_to_clusters(inode->i_sb,
810                                                                  phys_blkno),
811                                         len, ctxt->meta_ac, &ctxt->dealloc, 1);
812         else
813                 ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
814                                                   phys_blkno, len);
815         if (ret)
816                 mlog_errno(ret);
817 
818 out:
819         return ret;
820 }
821 
822 static int ocfs2_xattr_shrink_size(struct inode *inode,
823                                    u32 old_clusters,
824                                    u32 new_clusters,
825                                    struct ocfs2_xattr_value_buf *vb,
826                                    struct ocfs2_xattr_set_ctxt *ctxt)
827 {
828         int ret = 0;
829         unsigned int ext_flags;
830         u32 trunc_len, cpos, phys_cpos, alloc_size;
831         u64 block;
832 
833         if (old_clusters <= new_clusters)
834                 return 0;
835 
836         cpos = new_clusters;
837         trunc_len = old_clusters - new_clusters;
838         while (trunc_len) {
839                 ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
840                                                &alloc_size,
841                                                &vb->vb_xv->xr_list, &ext_flags);
842                 if (ret) {
843                         mlog_errno(ret);
844                         goto out;
845                 }
846 
847                 if (alloc_size > trunc_len)
848                         alloc_size = trunc_len;
849 
850                 ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
851                                                  phys_cpos, alloc_size,
852                                                  ext_flags, ctxt);
853                 if (ret) {
854                         mlog_errno(ret);
855                         goto out;
856                 }
857 
858                 block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
859                 ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
860                                                        block, alloc_size);
861                 cpos += alloc_size;
862                 trunc_len -= alloc_size;
863         }
864 
865 out:
866         return ret;
867 }
868 
869 static int ocfs2_xattr_value_truncate(struct inode *inode,
870                                       struct ocfs2_xattr_value_buf *vb,
871                                       int len,
872                                       struct ocfs2_xattr_set_ctxt *ctxt)
873 {
874         int ret;
875         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
876         u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
877 
878         if (new_clusters == old_clusters)
879                 return 0;
880 
881         if (new_clusters > old_clusters)
882                 ret = ocfs2_xattr_extend_allocation(inode,
883                                                     new_clusters - old_clusters,
884                                                     vb, ctxt);
885         else
886                 ret = ocfs2_xattr_shrink_size(inode,
887                                               old_clusters, new_clusters,
888                                               vb, ctxt);
889 
890         return ret;
891 }
892 
893 static int ocfs2_xattr_list_entry(char *buffer, size_t size,
894                                   size_t *result, const char *prefix,
895                                   const char *name, int name_len)
896 {
897         char *p = buffer + *result;
898         int prefix_len = strlen(prefix);
899         int total_len = prefix_len + name_len + 1;
900 
901         *result += total_len;
902 
903         /* we are just looking for how big our buffer needs to be */
904         if (!size)
905                 return 0;
906 
907         if (*result > size)
908                 return -ERANGE;
909 
910         memcpy(p, prefix, prefix_len);
911         memcpy(p + prefix_len, name, name_len);
912         p[prefix_len + name_len] = '\0';
913 
914         return 0;
915 }
916 
917 static int ocfs2_xattr_list_entries(struct inode *inode,
918                                     struct ocfs2_xattr_header *header,
919                                     char *buffer, size_t buffer_size)
920 {
921         size_t result = 0;
922         int i, type, ret;
923         const char *prefix, *name;
924 
925         for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
926                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
927                 type = ocfs2_xattr_get_type(entry);
928                 prefix = ocfs2_xattr_prefix(type);
929 
930                 if (prefix) {
931                         name = (const char *)header +
932                                 le16_to_cpu(entry->xe_name_offset);
933 
934                         ret = ocfs2_xattr_list_entry(buffer, buffer_size,
935                                                      &result, prefix, name,
936                                                      entry->xe_name_len);
937                         if (ret)
938                                 return ret;
939                 }
940         }
941 
942         return result;
943 }
944 
945 int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
946                                          struct ocfs2_dinode *di)
947 {
948         struct ocfs2_xattr_header *xh;
949         int i;
950 
951         xh = (struct ocfs2_xattr_header *)
952                  ((void *)di + inode->i_sb->s_blocksize -
953                  le16_to_cpu(di->i_xattr_inline_size));
954 
955         for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
956                 if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
957                         return 1;
958 
959         return 0;
960 }
961 
962 static int ocfs2_xattr_ibody_list(struct inode *inode,
963                                   struct ocfs2_dinode *di,
964                                   char *buffer,
965                                   size_t buffer_size)
966 {
967         struct ocfs2_xattr_header *header = NULL;
968         struct ocfs2_inode_info *oi = OCFS2_I(inode);
969         int ret = 0;
970 
971         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
972                 return ret;
973 
974         header = (struct ocfs2_xattr_header *)
975                  ((void *)di + inode->i_sb->s_blocksize -
976                  le16_to_cpu(di->i_xattr_inline_size));
977 
978         ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
979 
980         return ret;
981 }
982 
983 static int ocfs2_xattr_block_list(struct inode *inode,
984                                   struct ocfs2_dinode *di,
985                                   char *buffer,
986                                   size_t buffer_size)
987 {
988         struct buffer_head *blk_bh = NULL;
989         struct ocfs2_xattr_block *xb;
990         int ret = 0;
991 
992         if (!di->i_xattr_loc)
993                 return ret;
994 
995         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
996                                      &blk_bh);
997         if (ret < 0) {
998                 mlog_errno(ret);
999                 return ret;
1000         }
1001 
1002         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
1003         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
1004                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
1005                 ret = ocfs2_xattr_list_entries(inode, header,
1006                                                buffer, buffer_size);
1007         } else
1008                 ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
1009                                                    buffer, buffer_size);
1010 
1011         brelse(blk_bh);
1012 
1013         return ret;
1014 }
1015 
1016 ssize_t ocfs2_listxattr(struct dentry *dentry,
1017                         char *buffer,
1018                         size_t size)
1019 {
1020         int ret = 0, i_ret = 0, b_ret = 0;
1021         struct buffer_head *di_bh = NULL;
1022         struct ocfs2_dinode *di = NULL;
1023         struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
1024 
1025         if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
1026                 return -EOPNOTSUPP;
1027 
1028         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1029                 return ret;
1030 
1031         ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
1032         if (ret < 0) {
1033                 mlog_errno(ret);
1034                 return ret;
1035         }
1036 
1037         di = (struct ocfs2_dinode *)di_bh->b_data;
1038 
1039         down_read(&oi->ip_xattr_sem);
1040         i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
1041         if (i_ret < 0)
1042                 b_ret = 0;
1043         else {
1044                 if (buffer) {
1045                         buffer += i_ret;
1046                         size -= i_ret;
1047                 }
1048                 b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
1049                                                buffer, size);
1050                 if (b_ret < 0)
1051                         i_ret = 0;
1052         }
1053         up_read(&oi->ip_xattr_sem);
1054         ocfs2_inode_unlock(dentry->d_inode, 0);
1055 
1056         brelse(di_bh);
1057 
1058         return i_ret + b_ret;
1059 }
1060 
1061 static int ocfs2_xattr_find_entry(int name_index,
1062                                   const char *name,
1063                                   struct ocfs2_xattr_search *xs)
1064 {
1065         struct ocfs2_xattr_entry *entry;
1066         size_t name_len;
1067         int i, cmp = 1;
1068 
1069         if (name == NULL)
1070                 return -EINVAL;
1071 
1072         name_len = strlen(name);
1073         entry = xs->here;
1074         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1075                 cmp = name_index - ocfs2_xattr_get_type(entry);
1076                 if (!cmp)
1077                         cmp = name_len - entry->xe_name_len;
1078                 if (!cmp)
1079                         cmp = memcmp(name, (xs->base +
1080                                      le16_to_cpu(entry->xe_name_offset)),
1081                                      name_len);
1082                 if (cmp == 0)
1083                         break;
1084                 entry += 1;
1085         }
1086         xs->here = entry;
1087 
1088         return cmp ? -ENODATA : 0;
1089 }
1090 
1091 static int ocfs2_xattr_get_value_outside(struct inode *inode,
1092                                          struct ocfs2_xattr_value_root *xv,
1093                                          void *buffer,
1094                                          size_t len)
1095 {
1096         u32 cpos, p_cluster, num_clusters, bpc, clusters;
1097         u64 blkno;
1098         int i, ret = 0;
1099         size_t cplen, blocksize;
1100         struct buffer_head *bh = NULL;
1101         struct ocfs2_extent_list *el;
1102 
1103         el = &xv->xr_list;
1104         clusters = le32_to_cpu(xv->xr_clusters);
1105         bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1106         blocksize = inode->i_sb->s_blocksize;
1107 
1108         cpos = 0;
1109         while (cpos < clusters) {
1110                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1111                                                &num_clusters, el, NULL);
1112                 if (ret) {
1113                         mlog_errno(ret);
1114                         goto out;
1115                 }
1116 
1117                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1118                 /* Copy ocfs2_xattr_value */
1119                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1120                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1121                                                &bh, NULL);
1122                         if (ret) {
1123                                 mlog_errno(ret);
1124                                 goto out;
1125                         }
1126 
1127                         cplen = len >= blocksize ? blocksize : len;
1128                         memcpy(buffer, bh->b_data, cplen);
1129                         len -= cplen;
1130                         buffer += cplen;
1131 
1132                         brelse(bh);
1133                         bh = NULL;
1134                         if (len == 0)
1135                                 break;
1136                 }
1137                 cpos += num_clusters;
1138         }
1139 out:
1140         return ret;
1141 }
1142 
1143 static int ocfs2_xattr_ibody_get(struct inode *inode,
1144                                  int name_index,
1145                                  const char *name,
1146                                  void *buffer,
1147                                  size_t buffer_size,
1148                                  struct ocfs2_xattr_search *xs)
1149 {
1150         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1151         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1152         struct ocfs2_xattr_value_root *xv;
1153         size_t size;
1154         int ret = 0;
1155 
1156         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1157                 return -ENODATA;
1158 
1159         xs->end = (void *)di + inode->i_sb->s_blocksize;
1160         xs->header = (struct ocfs2_xattr_header *)
1161                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
1162         xs->base = (void *)xs->header;
1163         xs->here = xs->header->xh_entries;
1164 
1165         ret = ocfs2_xattr_find_entry(name_index, name, xs);
1166         if (ret)
1167                 return ret;
1168         size = le64_to_cpu(xs->here->xe_value_size);
1169         if (buffer) {
1170                 if (size > buffer_size)
1171                         return -ERANGE;
1172                 if (ocfs2_xattr_is_local(xs->here)) {
1173                         memcpy(buffer, (void *)xs->base +
1174                                le16_to_cpu(xs->here->xe_name_offset) +
1175                                OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1176                 } else {
1177                         xv = (struct ocfs2_xattr_value_root *)
1178                                 (xs->base + le16_to_cpu(
1179                                  xs->here->xe_name_offset) +
1180                                 OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1181                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1182                                                             buffer, size);
1183                         if (ret < 0) {
1184                                 mlog_errno(ret);
1185                                 return ret;
1186                         }
1187                 }
1188         }
1189 
1190         return size;
1191 }
1192 
1193 static int ocfs2_xattr_block_get(struct inode *inode,
1194                                  int name_index,
1195                                  const char *name,
1196                                  void *buffer,
1197                                  size_t buffer_size,
1198                                  struct ocfs2_xattr_search *xs)
1199 {
1200         struct ocfs2_xattr_block *xb;
1201         struct ocfs2_xattr_value_root *xv;
1202         size_t size;
1203         int ret = -ENODATA, name_offset, name_len, i;
1204         int uninitialized_var(block_off);
1205 
1206         xs->bucket = ocfs2_xattr_bucket_new(inode);
1207         if (!xs->bucket) {
1208                 ret = -ENOMEM;
1209                 mlog_errno(ret);
1210                 goto cleanup;
1211         }
1212 
1213         ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1214         if (ret) {
1215                 mlog_errno(ret);
1216                 goto cleanup;
1217         }
1218 
1219         if (xs->not_found) {
1220                 ret = -ENODATA;
1221                 goto cleanup;
1222         }
1223 
1224         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1225         size = le64_to_cpu(xs->here->xe_value_size);
1226         if (buffer) {
1227                 ret = -ERANGE;
1228                 if (size > buffer_size)
1229                         goto cleanup;
1230 
1231                 name_offset = le16_to_cpu(xs->here->xe_name_offset);
1232                 name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1233                 i = xs->here - xs->header->xh_entries;
1234 
1235                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1236                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1237                                                                 bucket_xh(xs->bucket),
1238                                                                 i,
1239                                                                 &block_off,
1240                                                                 &name_offset);
1241                         xs->base = bucket_block(xs->bucket, block_off);
1242                 }
1243                 if (ocfs2_xattr_is_local(xs->here)) {
1244                         memcpy(buffer, (void *)xs->base +
1245                                name_offset + name_len, size);
1246                 } else {
1247                         xv = (struct ocfs2_xattr_value_root *)
1248                                 (xs->base + name_offset + name_len);
1249                         ret = ocfs2_xattr_get_value_outside(inode, xv,
1250                                                             buffer, size);
1251                         if (ret < 0) {
1252                                 mlog_errno(ret);
1253                                 goto cleanup;
1254                         }
1255                 }
1256         }
1257         ret = size;
1258 cleanup:
1259         ocfs2_xattr_bucket_free(xs->bucket);
1260 
1261         brelse(xs->xattr_bh);
1262         xs->xattr_bh = NULL;
1263         return ret;
1264 }
1265 
1266 int ocfs2_xattr_get_nolock(struct inode *inode,
1267                            struct buffer_head *di_bh,
1268                            int name_index,
1269                            const char *name,
1270                            void *buffer,
1271                            size_t buffer_size)
1272 {
1273         int ret;
1274         struct ocfs2_dinode *di = NULL;
1275         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1276         struct ocfs2_xattr_search xis = {
1277                 .not_found = -ENODATA,
1278         };
1279         struct ocfs2_xattr_search xbs = {
1280                 .not_found = -ENODATA,
1281         };
1282 
1283         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1284                 return -EOPNOTSUPP;
1285 
1286         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1287                 return -ENODATA;
1288 
1289         xis.inode_bh = xbs.inode_bh = di_bh;
1290         di = (struct ocfs2_dinode *)di_bh->b_data;
1291 
1292         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1293                                     buffer_size, &xis);
1294         if (ret == -ENODATA && di->i_xattr_loc)
1295                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1296                                             buffer_size, &xbs);
1297 
1298         return ret;
1299 }
1300 
1301 /* ocfs2_xattr_get()
1302  *
1303  * Copy an extended attribute into the buffer provided.
1304  * Buffer is NULL to compute the size of buffer required.
1305  */
1306 static int ocfs2_xattr_get(struct inode *inode,
1307                            int name_index,
1308                            const char *name,
1309                            void *buffer,
1310                            size_t buffer_size)
1311 {
1312         int ret;
1313         struct buffer_head *di_bh = NULL;
1314 
1315         ret = ocfs2_inode_lock(inode, &di_bh, 0);
1316         if (ret < 0) {
1317                 mlog_errno(ret);
1318                 return ret;
1319         }
1320         down_read(&OCFS2_I(inode)->ip_xattr_sem);
1321         ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1322                                      name, buffer, buffer_size);
1323         up_read(&OCFS2_I(inode)->ip_xattr_sem);
1324 
1325         ocfs2_inode_unlock(inode, 0);
1326 
1327         brelse(di_bh);
1328 
1329         return ret;
1330 }
1331 
1332 static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1333                                            handle_t *handle,
1334                                            struct ocfs2_xattr_value_buf *vb,
1335                                            const void *value,
1336                                            int value_len)
1337 {
1338         int ret = 0, i, cp_len;
1339         u16 blocksize = inode->i_sb->s_blocksize;
1340         u32 p_cluster, num_clusters;
1341         u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1342         u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1343         u64 blkno;
1344         struct buffer_head *bh = NULL;
1345         unsigned int ext_flags;
1346         struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1347 
1348         BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1349 
1350         while (cpos < clusters) {
1351                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1352                                                &num_clusters, &xv->xr_list,
1353                                                &ext_flags);
1354                 if (ret) {
1355                         mlog_errno(ret);
1356                         goto out;
1357                 }
1358 
1359                 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1360 
1361                 blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1362 
1363                 for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1364                         ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1365                                                &bh, NULL);
1366                         if (ret) {
1367                                 mlog_errno(ret);
1368                                 goto out;
1369                         }
1370 
1371                         ret = ocfs2_journal_access(handle,
1372                                                    INODE_CACHE(inode),
1373                                                    bh,
1374                                                    OCFS2_JOURNAL_ACCESS_WRITE);
1375                         if (ret < 0) {
1376                                 mlog_errno(ret);
1377                                 goto out;
1378                         }
1379 
1380                         cp_len = value_len > blocksize ? blocksize : value_len;
1381                         memcpy(bh->b_data, value, cp_len);
1382                         value_len -= cp_len;
1383                         value += cp_len;
1384                         if (cp_len < blocksize)
1385                                 memset(bh->b_data + cp_len, 0,
1386                                        blocksize - cp_len);
1387 
1388                         ocfs2_journal_dirty(handle, bh);
1389                         brelse(bh);
1390                         bh = NULL;
1391 
1392                         /*
1393                          * XXX: do we need to empty all the following
1394                          * blocks in this cluster?
1395                          */
1396                         if (!value_len)
1397                                 break;
1398                 }
1399                 cpos += num_clusters;
1400         }
1401 out:
1402         brelse(bh);
1403 
1404         return ret;
1405 }
1406 
1407 static int ocfs2_xa_check_space_helper(int needed_space, int free_start,
1408                                        int num_entries)
1409 {
1410         int free_space;
1411 
1412         if (!needed_space)
1413                 return 0;
1414 
1415         free_space = free_start -
1416                 sizeof(struct ocfs2_xattr_header) -
1417                 (num_entries * sizeof(struct ocfs2_xattr_entry)) -
1418                 OCFS2_XATTR_HEADER_GAP;
1419         if (free_space < 0)
1420                 return -EIO;
1421         if (free_space < needed_space)
1422                 return -ENOSPC;
1423 
1424         return 0;
1425 }
1426 
1427 static int ocfs2_xa_journal_access(handle_t *handle, struct ocfs2_xa_loc *loc,
1428                                    int type)
1429 {
1430         return loc->xl_ops->xlo_journal_access(handle, loc, type);
1431 }
1432 
1433 static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
1434 {
1435         loc->xl_ops->xlo_journal_dirty(handle, loc);
1436 }
1437 
1438 /* Give a pointer into the storage for the given offset */
1439 static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
1440 {
1441         BUG_ON(offset >= loc->xl_size);
1442         return loc->xl_ops->xlo_offset_pointer(loc, offset);
1443 }
1444 
1445 /*
1446  * Wipe the name+value pair and allow the storage to reclaim it.  This
1447  * must be followed by either removal of the entry or a call to
1448  * ocfs2_xa_add_namevalue().
1449  */
1450 static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1451 {
1452         loc->xl_ops->xlo_wipe_namevalue(loc);
1453 }
1454 
1455 /*
1456  * Find lowest offset to a name+value pair.  This is the start of our
1457  * downward-growing free space.
1458  */
1459 static int ocfs2_xa_get_free_start(struct ocfs2_xa_loc *loc)
1460 {
1461         return loc->xl_ops->xlo_get_free_start(loc);
1462 }
1463 
1464 /* Can we reuse loc->xl_entry for xi? */
1465 static int ocfs2_xa_can_reuse_entry(struct ocfs2_xa_loc *loc,
1466                                     struct ocfs2_xattr_info *xi)
1467 {
1468         return loc->xl_ops->xlo_can_reuse(loc, xi);
1469 }
1470 
1471 /* How much free space is needed to set the new value */
1472 static int ocfs2_xa_check_space(struct ocfs2_xa_loc *loc,
1473                                 struct ocfs2_xattr_info *xi)
1474 {
1475         return loc->xl_ops->xlo_check_space(loc, xi);
1476 }
1477 
1478 static void ocfs2_xa_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1479 {
1480         loc->xl_ops->xlo_add_entry(loc, name_hash);
1481         loc->xl_entry->xe_name_hash = cpu_to_le32(name_hash);
1482         /*
1483          * We can't leave the new entry's xe_name_offset at zero or
1484          * add_namevalue() will go nuts.  We set it to the size of our
1485          * storage so that it can never be less than any other entry.
1486          */
1487         loc->xl_entry->xe_name_offset = cpu_to_le16(loc->xl_size);
1488 }
1489 
1490 static void ocfs2_xa_add_namevalue(struct ocfs2_xa_loc *loc,
1491                                    struct ocfs2_xattr_info *xi)
1492 {
1493         int size = namevalue_size_xi(xi);
1494         int nameval_offset;
1495         char *nameval_buf;
1496 
1497         loc->xl_ops->xlo_add_namevalue(loc, size);
1498         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
1499         loc->xl_entry->xe_name_len = xi->xi_name_len;
1500         ocfs2_xattr_set_type(loc->xl_entry, xi->xi_name_index);
1501         ocfs2_xattr_set_local(loc->xl_entry,
1502                               xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE);
1503 
1504         nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1505         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
1506         memset(nameval_buf, 0, size);
1507         memcpy(nameval_buf, xi->xi_name, xi->xi_name_len);
1508 }
1509 
1510 static void ocfs2_xa_fill_value_buf(struct ocfs2_xa_loc *loc,
1511                                     struct ocfs2_xattr_value_buf *vb)
1512 {
1513         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1514         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1515 
1516         /* Value bufs are for value trees */
1517         BUG_ON(ocfs2_xattr_is_local(loc->xl_entry));
1518         BUG_ON(namevalue_size_xe(loc->xl_entry) !=
1519                (name_size + OCFS2_XATTR_ROOT_SIZE));
1520 
1521         loc->xl_ops->xlo_fill_value_buf(loc, vb);
1522         vb->vb_xv =
1523                 (struct ocfs2_xattr_value_root *)ocfs2_xa_offset_pointer(loc,
1524                                                         nameval_offset +
1525                                                         name_size);
1526 }
1527 
1528 static int ocfs2_xa_block_journal_access(handle_t *handle,
1529                                          struct ocfs2_xa_loc *loc, int type)
1530 {
1531         struct buffer_head *bh = loc->xl_storage;
1532         ocfs2_journal_access_func access;
1533 
1534         if (loc->xl_size == (bh->b_size -
1535                              offsetof(struct ocfs2_xattr_block,
1536                                       xb_attrs.xb_header)))
1537                 access = ocfs2_journal_access_xb;
1538         else
1539                 access = ocfs2_journal_access_di;
1540         return access(handle, INODE_CACHE(loc->xl_inode), bh, type);
1541 }
1542 
1543 static void ocfs2_xa_block_journal_dirty(handle_t *handle,
1544                                          struct ocfs2_xa_loc *loc)
1545 {
1546         struct buffer_head *bh = loc->xl_storage;
1547 
1548         ocfs2_journal_dirty(handle, bh);
1549 }
1550 
1551 static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1552                                            int offset)
1553 {
1554         return (char *)loc->xl_header + offset;
1555 }
1556 
1557 static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
1558                                     struct ocfs2_xattr_info *xi)
1559 {
1560         /*
1561          * Block storage is strict.  If the sizes aren't exact, we will
1562          * remove the old one and reinsert the new.
1563          */
1564         return namevalue_size_xe(loc->xl_entry) ==
1565                 namevalue_size_xi(xi);
1566 }
1567 
1568 static int ocfs2_xa_block_get_free_start(struct ocfs2_xa_loc *loc)
1569 {
1570         struct ocfs2_xattr_header *xh = loc->xl_header;
1571         int i, count = le16_to_cpu(xh->xh_count);
1572         int offset, free_start = loc->xl_size;
1573 
1574         for (i = 0; i < count; i++) {
1575                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1576                 if (offset < free_start)
1577                         free_start = offset;
1578         }
1579 
1580         return free_start;
1581 }
1582 
1583 static int ocfs2_xa_block_check_space(struct ocfs2_xa_loc *loc,
1584                                       struct ocfs2_xattr_info *xi)
1585 {
1586         int count = le16_to_cpu(loc->xl_header->xh_count);
1587         int free_start = ocfs2_xa_get_free_start(loc);
1588         int needed_space = ocfs2_xi_entry_usage(xi);
1589 
1590         /*
1591          * Block storage will reclaim the original entry before inserting
1592          * the new value, so we only need the difference.  If the new
1593          * entry is smaller than the old one, we don't need anything.
1594          */
1595         if (loc->xl_entry) {
1596                 /* Don't need space if we're reusing! */
1597                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1598                         needed_space = 0;
1599                 else
1600                         needed_space -= ocfs2_xe_entry_usage(loc->xl_entry);
1601         }
1602         if (needed_space < 0)
1603                 needed_space = 0;
1604         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1605 }
1606 
1607 /*
1608  * Block storage for xattrs keeps the name+value pairs compacted.  When
1609  * we remove one, we have to shift any that preceded it towards the end.
1610  */
1611 static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1612 {
1613         int i, offset;
1614         int namevalue_offset, first_namevalue_offset, namevalue_size;
1615         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1616         struct ocfs2_xattr_header *xh = loc->xl_header;
1617         int count = le16_to_cpu(xh->xh_count);
1618 
1619         namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1620         namevalue_size = namevalue_size_xe(entry);
1621         first_namevalue_offset = ocfs2_xa_get_free_start(loc);
1622 
1623         /* Shift the name+value pairs */
1624         memmove((char *)xh + first_namevalue_offset + namevalue_size,
1625                 (char *)xh + first_namevalue_offset,
1626                 namevalue_offset - first_namevalue_offset);
1627         memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1628 
1629         /* Now tell xh->xh_entries about it */
1630         for (i = 0; i < count; i++) {
1631                 offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1632                 if (offset <= namevalue_offset)
1633                         le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1634                                      namevalue_size);
1635         }
1636 
1637         /*
1638          * Note that we don't update xh_free_start or xh_name_value_len
1639          * because they're not used in block-stored xattrs.
1640          */
1641 }
1642 
1643 static void ocfs2_xa_block_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1644 {
1645         int count = le16_to_cpu(loc->xl_header->xh_count);
1646         loc->xl_entry = &(loc->xl_header->xh_entries[count]);
1647         le16_add_cpu(&loc->xl_header->xh_count, 1);
1648         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1649 }
1650 
1651 static void ocfs2_xa_block_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1652 {
1653         int free_start = ocfs2_xa_get_free_start(loc);
1654 
1655         loc->xl_entry->xe_name_offset = cpu_to_le16(free_start - size);
1656 }
1657 
1658 static void ocfs2_xa_block_fill_value_buf(struct ocfs2_xa_loc *loc,
1659                                           struct ocfs2_xattr_value_buf *vb)
1660 {
1661         struct buffer_head *bh = loc->xl_storage;
1662 
1663         if (loc->xl_size == (bh->b_size -
1664                              offsetof(struct ocfs2_xattr_block,
1665                                       xb_attrs.xb_header)))
1666                 vb->vb_access = ocfs2_journal_access_xb;
1667         else
1668                 vb->vb_access = ocfs2_journal_access_di;
1669         vb->vb_bh = bh;
1670 }
1671 
1672 /*
1673  * Operations for xattrs stored in blocks.  This includes inline inode
1674  * storage and unindexed ocfs2_xattr_blocks.
1675  */
1676 static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1677         .xlo_journal_access     = ocfs2_xa_block_journal_access,
1678         .xlo_journal_dirty      = ocfs2_xa_block_journal_dirty,
1679         .xlo_offset_pointer     = ocfs2_xa_block_offset_pointer,
1680         .xlo_check_space        = ocfs2_xa_block_check_space,
1681         .xlo_can_reuse          = ocfs2_xa_block_can_reuse,
1682         .xlo_get_free_start     = ocfs2_xa_block_get_free_start,
1683         .xlo_wipe_namevalue     = ocfs2_xa_block_wipe_namevalue,
1684         .xlo_add_entry          = ocfs2_xa_block_add_entry,
1685         .xlo_add_namevalue      = ocfs2_xa_block_add_namevalue,
1686         .xlo_fill_value_buf     = ocfs2_xa_block_fill_value_buf,
1687 };
1688 
1689 static int ocfs2_xa_bucket_journal_access(handle_t *handle,
1690                                           struct ocfs2_xa_loc *loc, int type)
1691 {
1692         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1693 
1694         return ocfs2_xattr_bucket_journal_access(handle, bucket, type);
1695 }
1696 
1697 static void ocfs2_xa_bucket_journal_dirty(handle_t *handle,
1698                                           struct ocfs2_xa_loc *loc)
1699 {
1700         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1701 
1702         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
1703 }
1704 
1705 static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1706                                             int offset)
1707 {
1708         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1709         int block, block_offset;
1710 
1711         /* The header is at the front of the bucket */
1712         block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
1713         block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
1714 
1715         return bucket_block(bucket, block) + block_offset;
1716 }
1717 
1718 static int ocfs2_xa_bucket_can_reuse(struct ocfs2_xa_loc *loc,
1719                                      struct ocfs2_xattr_info *xi)
1720 {
1721         return namevalue_size_xe(loc->xl_entry) >=
1722                 namevalue_size_xi(xi);
1723 }
1724 
1725 static int ocfs2_xa_bucket_get_free_start(struct ocfs2_xa_loc *loc)
1726 {
1727         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1728         return le16_to_cpu(bucket_xh(bucket)->xh_free_start);
1729 }
1730 
1731 static int ocfs2_bucket_align_free_start(struct super_block *sb,
1732                                          int free_start, int size)
1733 {
1734         /*
1735          * We need to make sure that the name+value pair fits within
1736          * one block.
1737          */
1738         if (((free_start - size) >> sb->s_blocksize_bits) !=
1739             ((free_start - 1) >> sb->s_blocksize_bits))
1740                 free_start -= free_start % sb->s_blocksize;
1741 
1742         return free_start;
1743 }
1744 
1745 static int ocfs2_xa_bucket_check_space(struct ocfs2_xa_loc *loc,
1746                                        struct ocfs2_xattr_info *xi)
1747 {
1748         int rc;
1749         int count = le16_to_cpu(loc->xl_header->xh_count);
1750         int free_start = ocfs2_xa_get_free_start(loc);
1751         int needed_space = ocfs2_xi_entry_usage(xi);
1752         int size = namevalue_size_xi(xi);
1753         struct super_block *sb = loc->xl_inode->i_sb;
1754 
1755         /*
1756          * Bucket storage does not reclaim name+value pairs it cannot
1757          * reuse.  They live as holes until the bucket fills, and then
1758          * the bucket is defragmented.  However, the bucket can reclaim
1759          * the ocfs2_xattr_entry.
1760          */
1761         if (loc->xl_entry) {
1762                 /* Don't need space if we're reusing! */
1763                 if (ocfs2_xa_can_reuse_entry(loc, xi))
1764                         needed_space = 0;
1765                 else
1766                         needed_space -= sizeof(struct ocfs2_xattr_entry);
1767         }
1768         BUG_ON(needed_space < 0);
1769 
1770         if (free_start < size) {
1771                 if (needed_space)
1772                         return -ENOSPC;
1773         } else {
1774                 /*
1775                  * First we check if it would fit in the first place.
1776                  * Below, we align the free start to a block.  This may
1777                  * slide us below the minimum gap.  By checking unaligned
1778                  * first, we avoid that error.
1779                  */
1780                 rc = ocfs2_xa_check_space_helper(needed_space, free_start,
1781                                                  count);
1782                 if (rc)
1783                         return rc;
1784                 free_start = ocfs2_bucket_align_free_start(sb, free_start,
1785                                                            size);
1786         }
1787         return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1788 }
1789 
1790 static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1791 {
1792         le16_add_cpu(&loc->xl_header->xh_name_value_len,
1793                      -namevalue_size_xe(loc->xl_entry));
1794 }
1795 
1796 static void ocfs2_xa_bucket_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1797 {
1798         struct ocfs2_xattr_header *xh = loc->xl_header;
1799         int count = le16_to_cpu(xh->xh_count);
1800         int low = 0, high = count - 1, tmp;
1801         struct ocfs2_xattr_entry *tmp_xe;
1802 
1803         /*
1804          * We keep buckets sorted by name_hash, so we need to find
1805          * our insert place.
1806          */
1807         while (low <= high && count) {
1808                 tmp = (low + high) / 2;
1809                 tmp_xe = &xh->xh_entries[tmp];
1810 
1811                 if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
1812                         low = tmp + 1;
1813                 else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash))
1814                         high = tmp - 1;
1815                 else {
1816                         low = tmp;
1817                         break;
1818                 }
1819         }
1820 
1821         if (low != count)
1822                 memmove(&xh->xh_entries[low + 1],
1823                         &xh->xh_entries[low],
1824                         ((count - low) * sizeof(struct ocfs2_xattr_entry)));
1825 
1826         le16_add_cpu(&xh->xh_count, 1);
1827         loc->xl_entry = &xh->xh_entries[low];
1828         memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1829 }
1830 
1831 static void ocfs2_xa_bucket_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1832 {
1833         int free_start = ocfs2_xa_get_free_start(loc);
1834         struct ocfs2_xattr_header *xh = loc->xl_header;
1835         struct super_block *sb = loc->xl_inode->i_sb;
1836         int nameval_offset;
1837 
1838         free_start = ocfs2_bucket_align_free_start(sb, free_start, size);
1839         nameval_offset = free_start - size;
1840         loc->xl_entry->xe_name_offset = cpu_to_le16(nameval_offset);
1841         xh->xh_free_start = cpu_to_le16(nameval_offset);
1842         le16_add_cpu(&xh->xh_name_value_len, size);
1843 
1844 }
1845 
1846 static void ocfs2_xa_bucket_fill_value_buf(struct ocfs2_xa_loc *loc,
1847                                            struct ocfs2_xattr_value_buf *vb)
1848 {
1849         struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1850         struct super_block *sb = loc->xl_inode->i_sb;
1851         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1852         int size = namevalue_size_xe(loc->xl_entry);
1853         int block_offset = nameval_offset >> sb->s_blocksize_bits;
1854 
1855         /* Values are not allowed to straddle block boundaries */
1856         BUG_ON(block_offset !=
1857                ((nameval_offset + size - 1) >> sb->s_blocksize_bits));
1858         /* We expect the bucket to be filled in */
1859         BUG_ON(!bucket->bu_bhs[block_offset]);
1860 
1861         vb->vb_access = ocfs2_journal_access;
1862         vb->vb_bh = bucket->bu_bhs[block_offset];
1863 }
1864 
1865 /* Operations for xattrs stored in buckets. */
1866 static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1867         .xlo_journal_access     = ocfs2_xa_bucket_journal_access,
1868         .xlo_journal_dirty      = ocfs2_xa_bucket_journal_dirty,
1869         .xlo_offset_pointer     = ocfs2_xa_bucket_offset_pointer,
1870         .xlo_check_space        = ocfs2_xa_bucket_check_space,
1871         .xlo_can_reuse          = ocfs2_xa_bucket_can_reuse,
1872         .xlo_get_free_start     = ocfs2_xa_bucket_get_free_start,
1873         .xlo_wipe_namevalue     = ocfs2_xa_bucket_wipe_namevalue,
1874         .xlo_add_entry          = ocfs2_xa_bucket_add_entry,
1875         .xlo_add_namevalue      = ocfs2_xa_bucket_add_namevalue,
1876         .xlo_fill_value_buf     = ocfs2_xa_bucket_fill_value_buf,
1877 };
1878 
1879 static unsigned int ocfs2_xa_value_clusters(struct ocfs2_xa_loc *loc)
1880 {
1881         struct ocfs2_xattr_value_buf vb;
1882 
1883         if (ocfs2_xattr_is_local(loc->xl_entry))
1884                 return 0;
1885 
1886         ocfs2_xa_fill_value_buf(loc, &vb);
1887         return le32_to_cpu(vb.vb_xv->xr_clusters);
1888 }
1889 
1890 static int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1891                                    struct ocfs2_xattr_set_ctxt *ctxt)
1892 {
1893         int trunc_rc, access_rc;
1894         struct ocfs2_xattr_value_buf vb;
1895 
1896         ocfs2_xa_fill_value_buf(loc, &vb);
1897         trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1898                                               ctxt);
1899 
1900         /*
1901          * The caller of ocfs2_xa_value_truncate() has already called
1902          * ocfs2_xa_journal_access on the loc.  However, The truncate code
1903          * calls ocfs2_extend_trans().  This may commit the previous
1904          * transaction and open a new one.  If this is a bucket, truncate
1905          * could leave only vb->vb_bh set up for journaling.  Meanwhile,
1906          * the caller is expecting to dirty the entire bucket.  So we must
1907          * reset the journal work.  We do this even if truncate has failed,
1908          * as it could have failed after committing the extend.
1909          */
1910         access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1911                                             OCFS2_JOURNAL_ACCESS_WRITE);
1912 
1913         /* Errors in truncate take precedence */
1914         return trunc_rc ? trunc_rc : access_rc;
1915 }
1916 
1917 static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1918 {
1919         int index, count;
1920         struct ocfs2_xattr_header *xh = loc->xl_header;
1921         struct ocfs2_xattr_entry *entry = loc->xl_entry;
1922 
1923         ocfs2_xa_wipe_namevalue(loc);
1924         loc->xl_entry = NULL;
1925 
1926         le16_add_cpu(&xh->xh_count, -1);
1927         count = le16_to_cpu(xh->xh_count);
1928 
1929         /*
1930          * Only zero out the entry if there are more remaining.  This is
1931          * important for an empty bucket, as it keeps track of the
1932          * bucket's hash value.  It doesn't hurt empty block storage.
1933          */
1934         if (count) {
1935                 index = ((char *)entry - (char *)&xh->xh_entries) /
1936                         sizeof(struct ocfs2_xattr_entry);
1937                 memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1938                         (count - index) * sizeof(struct ocfs2_xattr_entry));
1939                 memset(&xh->xh_entries[count], 0,
1940                        sizeof(struct ocfs2_xattr_entry));
1941         }
1942 }
1943 
1944 /*
1945  * If we have a problem adjusting the size of an external value during
1946  * ocfs2_xa_prepare_entry() or ocfs2_xa_remove(), we may have an xattr
1947  * in an intermediate state.  For example, the value may be partially
1948  * truncated.
1949  *
1950  * If the value tree hasn't changed, the extend/truncate went nowhere.
1951  * We have nothing to do.  The caller can treat it as a straight error.
1952  *
1953  * If the value tree got partially truncated, we now have a corrupted
1954  * extended attribute.  We're going to wipe its entry and leak the
1955  * clusters.  Better to leak some storage than leave a corrupt entry.
1956  *
1957  * If the value tree grew, it obviously didn't grow enough for the
1958  * new entry.  We're not going to try and reclaim those clusters either.
1959  * If there was already an external value there (orig_clusters != 0),
1960  * the new clusters are attached safely and we can just leave the old
1961  * value in place.  If there was no external value there, we remove
1962  * the entry.
1963  *
1964  * This way, the xattr block we store in the journal will be consistent.
1965  * If the size change broke because of the journal, no changes will hit
1966  * disk anyway.
1967  */
1968 static void ocfs2_xa_cleanup_value_truncate(struct ocfs2_xa_loc *loc,
1969                                             const char *what,
1970                                             unsigned int orig_clusters)
1971 {
1972         unsigned int new_clusters = ocfs2_xa_value_clusters(loc);
1973         char *nameval_buf = ocfs2_xa_offset_pointer(loc,
1974                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
1975 
1976         if (new_clusters < orig_clusters) {
1977                 mlog(ML_ERROR,
1978                      "Partial truncate while %s xattr %.*s.  Leaking "
1979                      "%u clusters and removing the entry\n",
1980                      what, loc->xl_entry->xe_name_len, nameval_buf,
1981                      orig_clusters - new_clusters);
1982                 ocfs2_xa_remove_entry(loc);
1983         } else if (!orig_clusters) {
1984                 mlog(ML_ERROR,
1985                      "Unable to allocate an external value for xattr "
1986                      "%.*s safely.  Leaking %u clusters and removing the "
1987                      "entry\n",
1988                      loc->xl_entry->xe_name_len, nameval_buf,
1989                      new_clusters - orig_clusters);
1990                 ocfs2_xa_remove_entry(loc);
1991         } else if (new_clusters > orig_clusters)
1992                 mlog(ML_ERROR,
1993                      "Unable to grow xattr %.*s safely.  %u new clusters "
1994                      "have been added, but the value will not be "
1995                      "modified\n",
1996                      loc->xl_entry->xe_name_len, nameval_buf,
1997                      new_clusters - orig_clusters);
1998 }
1999 
2000 static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
2001                            struct ocfs2_xattr_set_ctxt *ctxt)
2002 {
2003         int rc = 0;
2004         unsigned int orig_clusters;
2005 
2006         if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2007                 orig_clusters = ocfs2_xa_value_clusters(loc);
2008                 rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2009                 if (rc) {
2010                         mlog_errno(rc);
2011                         /*
2012                          * Since this is remove, we can return 0 if
2013                          * ocfs2_xa_cleanup_value_truncate() is going to
2014                          * wipe the entry anyway.  So we check the
2015                          * cluster count as well.
2016                          */
2017                         if (orig_clusters != ocfs2_xa_value_clusters(loc))
2018                                 rc = 0;
2019                         ocfs2_xa_cleanup_value_truncate(loc, "removing",
2020                                                         orig_clusters);
2021                         if (rc)
2022                                 goto out;
2023                 }
2024         }
2025 
2026         ocfs2_xa_remove_entry(loc);
2027 
2028 out:
2029         return rc;
2030 }
2031 
2032 static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
2033 {
2034         int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
2035         char *nameval_buf;
2036 
2037         nameval_buf = ocfs2_xa_offset_pointer(loc,
2038                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2039         memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
2040 }
2041 
2042 /*
2043  * Take an existing entry and make it ready for the new value.  This
2044  * won't allocate space, but it may free space.  It should be ready for
2045  * ocfs2_xa_prepare_entry() to finish the work.
2046  */
2047 static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
2048                                 struct ocfs2_xattr_info *xi,
2049                                 struct ocfs2_xattr_set_ctxt *ctxt)
2050 {
2051         int rc = 0;
2052         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2053         unsigned int orig_clusters;
2054         char *nameval_buf;
2055         int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
2056         int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
2057 
2058         BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
2059                name_size);
2060 
2061         nameval_buf = ocfs2_xa_offset_pointer(loc,
2062                                 le16_to_cpu(loc->xl_entry->xe_name_offset));
2063         if (xe_local) {
2064                 memset(nameval_buf + name_size, 0,
2065                        namevalue_size_xe(loc->xl_entry) - name_size);
2066                 if (!xi_local)
2067                         ocfs2_xa_install_value_root(loc);
2068         } else {
2069                 orig_clusters = ocfs2_xa_value_clusters(loc);
2070                 if (xi_local) {
2071                         rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2072                         if (rc < 0)
2073                                 mlog_errno(rc);
2074                         else
2075                                 memset(nameval_buf + name_size, 0,
2076                                        namevalue_size_xe(loc->xl_entry) -
2077                                        name_size);
2078                 } else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
2079                            xi->xi_value_len) {
2080                         rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
2081                                                      ctxt);
2082                         if (rc < 0)
2083                                 mlog_errno(rc);
2084                 }
2085 
2086                 if (rc) {
2087                         ocfs2_xa_cleanup_value_truncate(loc, "reusing",
2088                                                         orig_clusters);
2089                         goto out;
2090                 }
2091         }
2092 
2093         loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2094         ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2095 
2096 out:
2097         return rc;
2098 }
2099 
2100 /*
2101  * Prepares loc->xl_entry to receive the new xattr.  This includes
2102  * properly setting up the name+value pair region.  If loc->xl_entry
2103  * already exists, it will take care of modifying it appropriately.
2104  *
2105  * Note that this modifies the data.  You did journal_access already,
2106  * right?
2107  */
2108 static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2109                                   struct ocfs2_xattr_info *xi,
2110                                   u32 name_hash,
2111                                   struct ocfs2_xattr_set_ctxt *ctxt)
2112 {
2113         int rc = 0;
2114         unsigned int orig_clusters;
2115         __le64 orig_value_size = 0;
2116 
2117         rc = ocfs2_xa_check_space(loc, xi);
2118         if (rc)
2119                 goto out;
2120 
2121         if (loc->xl_entry) {
2122                 if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2123                         orig_value_size = loc->xl_entry->xe_value_size;
2124                         rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2125                         if (rc)
2126                                 goto out;
2127                         goto alloc_value;
2128                 }
2129 
2130                 if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2131                         orig_clusters = ocfs2_xa_value_clusters(loc);
2132                         rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2133                         if (rc) {
2134                                 mlog_errno(rc);
2135                                 ocfs2_xa_cleanup_value_truncate(loc,
2136                                                                 "overwriting",
2137                                                                 orig_clusters);
2138                                 goto out;
2139                         }
2140                 }
2141                 ocfs2_xa_wipe_namevalue(loc);
2142         } else
2143                 ocfs2_xa_add_entry(loc, name_hash);
2144 
2145         /*
2146          * If we get here, we have a blank entry.  Fill it.  We grow our
2147          * name+value pair back from the end.
2148          */
2149         ocfs2_xa_add_namevalue(loc, xi);
2150         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2151                 ocfs2_xa_install_value_root(loc);
2152 
2153 alloc_value:
2154         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2155                 orig_clusters = ocfs2_xa_value_clusters(loc);
2156                 rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2157                 if (rc < 0) {
2158                         ctxt->set_abort = 1;
2159                         ocfs2_xa_cleanup_value_truncate(loc, "growing",
2160                                                         orig_clusters);
2161                         /*
2162                          * If we were growing an existing value,
2163                          * ocfs2_xa_cleanup_value_truncate() won't remove
2164                          * the entry. We need to restore the original value
2165                          * size.
2166                          */
2167                         if (loc->xl_entry) {
2168                                 BUG_ON(!orig_value_size);
2169                                 loc->xl_entry->xe_value_size = orig_value_size;
2170                         }
2171                         mlog_errno(rc);
2172                 }
2173         }
2174 
2175 out:
2176         return rc;
2177 }
2178 
2179 /*
2180  * Store the value portion of the name+value pair.  This will skip
2181  * values that are stored externally.  Their tree roots were set up
2182  * by ocfs2_xa_prepare_entry().
2183  */
2184 static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2185                                 struct ocfs2_xattr_info *xi,
2186                                 struct ocfs2_xattr_set_ctxt *ctxt)
2187 {
2188         int rc = 0;
2189         int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2190         int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2191         char *nameval_buf;
2192         struct ocfs2_xattr_value_buf vb;
2193 
2194         nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2195         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2196                 ocfs2_xa_fill_value_buf(loc, &vb);
2197                 rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2198                                                      ctxt->handle, &vb,
2199                                                      xi->xi_value,
2200                                                      xi->xi_value_len);
2201         } else
2202                 memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2203 
2204         return rc;
2205 }
2206 
2207 static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2208                         struct ocfs2_xattr_info *xi,
2209                         struct ocfs2_xattr_set_ctxt *ctxt)
2210 {
2211         int ret;
2212         u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2213                                               xi->xi_name_len);
2214 
2215         ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2216                                       OCFS2_JOURNAL_ACCESS_WRITE);
2217         if (ret) {
2218                 mlog_errno(ret);
2219                 goto out;
2220         }
2221 
2222         /*
2223          * From here on out, everything is going to modify the buffer a
2224          * little.  Errors are going to leave the xattr header in a
2225          * sane state.  Thus, even with errors we dirty the sucker.
2226          */
2227 
2228         /* Don't worry, we are never called with !xi_value and !xl_entry */
2229         if (!xi->xi_value) {
2230                 ret = ocfs2_xa_remove(loc, ctxt);
2231                 goto out_dirty;
2232         }
2233 
2234         ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2235         if (ret) {
2236                 if (ret != -ENOSPC)
2237                         mlog_errno(ret);
2238                 goto out_dirty;
2239         }
2240 
2241         ret = ocfs2_xa_store_value(loc, xi, ctxt);
2242         if (ret)
2243                 mlog_errno(ret);
2244 
2245 out_dirty:
2246         ocfs2_xa_journal_dirty(ctxt->handle, loc);
2247 
2248 out:
2249         return ret;
2250 }
2251 
2252 static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2253                                      struct inode *inode,
2254                                      struct buffer_head *bh,
2255                                      struct ocfs2_xattr_entry *entry)
2256 {
2257         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2258 
2259         BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL));
2260 
2261         loc->xl_inode = inode;
2262         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2263         loc->xl_storage = bh;
2264         loc->xl_entry = entry;
2265         loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2266         loc->xl_header =
2267                 (struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2268                                               loc->xl_size);
2269 }
2270 
2271 static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2272                                           struct inode *inode,
2273                                           struct buffer_head *bh,
2274                                           struct ocfs2_xattr_entry *entry)
2275 {
2276         struct ocfs2_xattr_block *xb =
2277                 (struct ocfs2_xattr_block *)bh->b_data;
2278 
2279         BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2280 
2281         loc->xl_inode = inode;
2282         loc->xl_ops = &ocfs2_xa_block_loc_ops;
2283         loc->xl_storage = bh;
2284         loc->xl_header = &(xb->xb_attrs.xb_header);
2285         loc->xl_entry = entry;
2286         loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2287                                              xb_attrs.xb_header);
2288 }
2289 
2290 static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2291                                            struct ocfs2_xattr_bucket *bucket,
2292                                            struct ocfs2_xattr_entry *entry)
2293 {
2294         loc->xl_inode = bucket->bu_inode;
2295         loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2296         loc->xl_storage = bucket;
2297         loc->xl_header = bucket_xh(bucket);
2298         loc->xl_entry = entry;
2299         loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2300 }
2301 
2302 /*
2303  * In xattr remove, if it is stored outside and refcounted, we may have
2304  * the chance to split the refcount tree. So need the allocators.
2305  */
2306 static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2307                                         struct ocfs2_xattr_value_root *xv,
2308                                         struct ocfs2_caching_info *ref_ci,
2309                                         struct buffer_head *ref_root_bh,
2310                                         struct ocfs2_alloc_context **meta_ac,
2311                                         int *ref_credits)
2312 {
2313         int ret, meta_add = 0;
2314         u32 p_cluster, num_clusters;
2315         unsigned int ext_flags;
2316 
2317         *ref_credits = 0;
2318         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2319                                        &num_clusters,
2320                                        &xv->xr_list,
2321                                        &ext_flags);
2322         if (ret) {
2323                 mlog_errno(ret);
2324                 goto out;
2325         }
2326 
2327         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2328                 goto out;
2329 
2330         ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2331                                                  ref_root_bh, xv,
2332                                                  &meta_add, ref_credits);
2333         if (ret) {
2334                 mlog_errno(ret);
2335                 goto out;
2336         }
2337 
2338         ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2339                                                 meta_add, meta_ac);
2340         if (ret)
2341                 mlog_errno(ret);
2342 
2343 out:
2344         return ret;
2345 }
2346 
2347 static int ocfs2_remove_value_outside(struct inode*inode,
2348                                       struct ocfs2_xattr_value_buf *vb,
2349                                       struct ocfs2_xattr_header *header,
2350                                       struct ocfs2_caching_info *ref_ci,
2351                                       struct buffer_head *ref_root_bh)
2352 {
2353         int ret = 0, i, ref_credits;
2354         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2355         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2356         void *val;
2357 
2358         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2359 
2360         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2361                 struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2362 
2363                 if (ocfs2_xattr_is_local(entry))
2364                         continue;
2365 
2366                 val = (void *)header +
2367                         le16_to_cpu(entry->xe_name_offset);
2368                 vb->vb_xv = (struct ocfs2_xattr_value_root *)
2369                         (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2370 
2371                 ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2372                                                          ref_ci, ref_root_bh,
2373                                                          &ctxt.meta_ac,
2374                                                          &ref_credits);
2375 
2376                 ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2377                                         ocfs2_remove_extent_credits(osb->sb));
2378                 if (IS_ERR(ctxt.handle)) {
2379                         ret = PTR_ERR(ctxt.handle);
2380                         mlog_errno(ret);
2381                         break;
2382                 }
2383 
2384                 ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2385 
2386                 ocfs2_commit_trans(osb, ctxt.handle);
2387                 if (ctxt.meta_ac) {
2388                         ocfs2_free_alloc_context(ctxt.meta_ac);
2389                         ctxt.meta_ac = NULL;
2390                 }
2391 
2392                 if (ret < 0) {
2393                         mlog_errno(ret);
2394                         break;
2395                 }
2396 
2397         }
2398 
2399         if (ctxt.meta_ac)
2400                 ocfs2_free_alloc_context(ctxt.meta_ac);
2401         ocfs2_schedule_truncate_log_flush(osb, 1);
2402         ocfs2_run_deallocs(osb, &ctxt.dealloc);
2403         return ret;
2404 }
2405 
2406 static int ocfs2_xattr_ibody_remove(struct inode *inode,
2407                                     struct buffer_head *di_bh,
2408                                     struct ocfs2_caching_info *ref_ci,
2409                                     struct buffer_head *ref_root_bh)
2410 {
2411 
2412         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2413         struct ocfs2_xattr_header *header;
2414         int ret;
2415         struct ocfs2_xattr_value_buf vb = {
2416                 .vb_bh = di_bh,
2417                 .vb_access = ocfs2_journal_access_di,
2418         };
2419 
2420         header = (struct ocfs2_xattr_header *)
2421                  ((void *)di + inode->i_sb->s_blocksize -
2422                  le16_to_cpu(di->i_xattr_inline_size));
2423 
2424         ret = ocfs2_remove_value_outside(inode, &vb, header,
2425                                          ref_ci, ref_root_bh);
2426 
2427         return ret;
2428 }
2429 
2430 struct ocfs2_rm_xattr_bucket_para {
2431         struct ocfs2_caching_info *ref_ci;
2432         struct buffer_head *ref_root_bh;
2433 };
2434 
2435 static int ocfs2_xattr_block_remove(struct inode *inode,
2436                                     struct buffer_head *blk_bh,
2437                                     struct ocfs2_caching_info *ref_ci,
2438                                     struct buffer_head *ref_root_bh)
2439 {
2440         struct ocfs2_xattr_block *xb;
2441         int ret = 0;
2442         struct ocfs2_xattr_value_buf vb = {
2443                 .vb_bh = blk_bh,
2444                 .vb_access = ocfs2_journal_access_xb,
2445         };
2446         struct ocfs2_rm_xattr_bucket_para args = {
2447                 .ref_ci = ref_ci,
2448                 .ref_root_bh = ref_root_bh,
2449         };
2450 
2451         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2452         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2453                 struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2454                 ret = ocfs2_remove_value_outside(inode, &vb, header,
2455                                                  ref_ci, ref_root_bh);
2456         } else
2457                 ret = ocfs2_iterate_xattr_index_block(inode,
2458                                                 blk_bh,
2459                                                 ocfs2_rm_xattr_cluster,
2460                                                 &args);
2461 
2462         return ret;
2463 }
2464 
2465 static int ocfs2_xattr_free_block(struct inode *inode,
2466                                   u64 block,
2467                                   struct ocfs2_caching_info *ref_ci,
2468                                   struct buffer_head *ref_root_bh)
2469 {
2470         struct inode *xb_alloc_inode;
2471         struct buffer_head *xb_alloc_bh = NULL;
2472         struct buffer_head *blk_bh = NULL;
2473         struct ocfs2_xattr_block *xb;
2474         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2475         handle_t *handle;
2476         int ret = 0;
2477         u64 blk, bg_blkno;
2478         u16 bit;
2479 
2480         ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2481         if (ret < 0) {
2482                 mlog_errno(ret);
2483                 goto out;
2484         }
2485 
2486         ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2487         if (ret < 0) {
2488                 mlog_errno(ret);
2489                 goto out;
2490         }
2491 
2492         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2493         blk = le64_to_cpu(xb->xb_blkno);
2494         bit = le16_to_cpu(xb->xb_suballoc_bit);
2495         if (xb->xb_suballoc_loc)
2496                 bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2497         else
2498                 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2499 
2500         xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2501                                 EXTENT_ALLOC_SYSTEM_INODE,
2502                                 le16_to_cpu(xb->xb_suballoc_slot));
2503         if (!xb_alloc_inode) {
2504                 ret = -ENOMEM;
2505                 mlog_errno(ret);
2506                 goto out;
2507         }
2508         mutex_lock(&xb_alloc_inode->i_mutex);
2509 
2510         ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2511         if (ret < 0) {
2512                 mlog_errno(ret);
2513                 goto out_mutex;
2514         }
2515 
2516         handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2517         if (IS_ERR(handle)) {
2518                 ret = PTR_ERR(handle);
2519                 mlog_errno(ret);
2520                 goto out_unlock;
2521         }
2522 
2523         ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2524                                        bit, bg_blkno, 1);
2525         if (ret < 0)
2526                 mlog_errno(ret);
2527 
2528         ocfs2_commit_trans(osb, handle);
2529 out_unlock:
2530         ocfs2_inode_unlock(xb_alloc_inode, 1);
2531         brelse(xb_alloc_bh);
2532 out_mutex:
2533         mutex_unlock(&xb_alloc_inode->i_mutex);
2534         iput(xb_alloc_inode);
2535 out:
2536         brelse(blk_bh);
2537         return ret;
2538 }
2539 
2540 /*
2541  * ocfs2_xattr_remove()
2542  *
2543  * Free extended attribute resources associated with this inode.
2544  */
2545 int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2546 {
2547         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2548         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2549         struct ocfs2_refcount_tree *ref_tree = NULL;
2550         struct buffer_head *ref_root_bh = NULL;
2551         struct ocfs2_caching_info *ref_ci = NULL;
2552         handle_t *handle;
2553         int ret;
2554 
2555         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2556                 return 0;
2557 
2558         if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2559                 return 0;
2560 
2561         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2562                 ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2563                                                le64_to_cpu(di->i_refcount_loc),
2564                                                1, &ref_tree, &ref_root_bh);
2565                 if (ret) {
2566                         mlog_errno(ret);
2567                         goto out;
2568                 }
2569                 ref_ci = &ref_tree->rf_ci;
2570 
2571         }
2572 
2573         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2574                 ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2575                                                ref_ci, ref_root_bh);
2576                 if (ret < 0) {
2577                         mlog_errno(ret);
2578                         goto out;
2579                 }
2580         }
2581 
2582         if (di->i_xattr_loc) {
2583                 ret = ocfs2_xattr_free_block(inode,
2584                                              le64_to_cpu(di->i_xattr_loc),
2585                                              ref_ci, ref_root_bh);
2586                 if (ret < 0) {
2587                         mlog_errno(ret);
2588                         goto out;
2589                 }
2590         }
2591 
2592         handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2593                                    OCFS2_INODE_UPDATE_CREDITS);
2594         if (IS_ERR(handle)) {
2595                 ret = PTR_ERR(handle);
2596                 mlog_errno(ret);
2597                 goto out;
2598         }
2599         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2600                                       OCFS2_JOURNAL_ACCESS_WRITE);
2601         if (ret) {
2602                 mlog_errno(ret);
2603                 goto out_commit;
2604         }
2605 
2606         di->i_xattr_loc = 0;
2607 
2608         spin_lock(&oi->ip_lock);
2609         oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2610         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2611         spin_unlock(&oi->ip_lock);
2612         ocfs2_update_inode_fsync_trans(handle, inode, 0);
2613 
2614         ocfs2_journal_dirty(handle, di_bh);
2615 out_commit:
2616         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2617 out:
2618         if (ref_tree)
2619                 ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2620         brelse(ref_root_bh);
2621         return ret;
2622 }
2623 
2624 static int ocfs2_xattr_has_space_inline(struct inode *inode,
2625                                         struct ocfs2_dinode *di)
2626 {
2627         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2628         unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2629         int free;
2630 
2631         if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2632                 return 0;
2633 
2634         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2635                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2636                 free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2637         } else if (ocfs2_inode_is_fast_symlink(inode)) {
2638                 free = ocfs2_fast_symlink_chars(inode->i_sb) -
2639                         le64_to_cpu(di->i_size);
2640         } else {
2641                 struct ocfs2_extent_list *el = &di->id2.i_list;
2642                 free = (le16_to_cpu(el->l_count) -
2643                         le16_to_cpu(el->l_next_free_rec)) *
2644                         sizeof(struct ocfs2_extent_rec);
2645         }
2646         if (free >= xattrsize)
2647                 return 1;
2648 
2649         return 0;
2650 }
2651 
2652 /*
2653  * ocfs2_xattr_ibody_find()
2654  *
2655  * Find extended attribute in inode block and
2656  * fill search info into struct ocfs2_xattr_search.
2657  */
2658 static int ocfs2_xattr_ibody_find(struct inode *inode,
2659                                   int name_index,
2660                                   const char *name,
2661                                   struct ocfs2_xattr_search *xs)
2662 {
2663         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2664         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2665         int ret;
2666         int has_space = 0;
2667 
2668         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2669                 return 0;
2670 
2671         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2672                 down_read(&oi->ip_alloc_sem);
2673                 has_space = ocfs2_xattr_has_space_inline(inode, di);
2674                 up_read(&oi->ip_alloc_sem);
2675                 if (!has_space)
2676                         return 0;
2677         }
2678 
2679         xs->xattr_bh = xs->inode_bh;
2680         xs->end = (void *)di + inode->i_sb->s_blocksize;
2681         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2682                 xs->header = (struct ocfs2_xattr_header *)
2683                         (xs->end - le16_to_cpu(di->i_xattr_inline_size));
2684         else
2685                 xs->header = (struct ocfs2_xattr_header *)
2686                         (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2687         xs->base = (void *)xs->header;
2688         xs->here = xs->header->xh_entries;
2689 
2690         /* Find the named attribute. */
2691         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2692                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2693                 if (ret && ret != -ENODATA)
2694                         return ret;
2695                 xs->not_found = ret;
2696         }
2697 
2698         return 0;
2699 }
2700 
2701 static int ocfs2_xattr_ibody_init(struct inode *inode,
2702                                   struct buffer_head *di_bh,
2703                                   struct ocfs2_xattr_set_ctxt *ctxt)
2704 {
2705         int ret;
2706         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2707         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2708         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2709         unsigned int xattrsize = osb->s_xattr_inline_size;
2710 
2711         if (!ocfs2_xattr_has_space_inline(inode, di)) {
2712                 ret = -ENOSPC;
2713                 goto out;
2714         }
2715 
2716         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2717                                       OCFS2_JOURNAL_ACCESS_WRITE);
2718         if (ret) {
2719                 mlog_errno(ret);
2720                 goto out;
2721         }
2722 
2723         /*
2724          * Adjust extent record count or inline data size
2725          * to reserve space for extended attribute.
2726          */
2727         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2728                 struct ocfs2_inline_data *idata = &di->id2.i_data;
2729                 le16_add_cpu(&idata->id_count, -xattrsize);
2730         } else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2731                 struct ocfs2_extent_list *el = &di->id2.i_list;
2732                 le16_add_cpu(&el->l_count, -(xattrsize /
2733                                              sizeof(struct ocfs2_extent_rec)));
2734         }
2735         di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2736 
2737         spin_lock(&oi->ip_lock);
2738         oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2739         di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2740         spin_unlock(&oi->ip_lock);
2741 
2742         ocfs2_journal_dirty(ctxt->handle, di_bh);
2743 
2744 out:
2745         return ret;
2746 }
2747 
2748 /*
2749  * ocfs2_xattr_ibody_set()
2750  *
2751  * Set, replace or remove an extended attribute into inode block.
2752  *
2753  */
2754 static int ocfs2_xattr_ibody_set(struct inode *inode,
2755                                  struct ocfs2_xattr_info *xi,
2756                                  struct ocfs2_xattr_search *xs,
2757                                  struct ocfs2_xattr_set_ctxt *ctxt)
2758 {
2759         int ret;
2760         struct ocfs2_inode_info *oi = OCFS2_I(inode);
2761         struct ocfs2_xa_loc loc;
2762 
2763         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2764                 return -ENOSPC;
2765 
2766         down_write(&oi->ip_alloc_sem);
2767         if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2768                 ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2769                 if (ret) {
2770                         if (ret != -ENOSPC)
2771                                 mlog_errno(ret);
2772                         goto out;
2773                 }
2774         }
2775 
2776         ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2777                                  xs->not_found ? NULL : xs->here);
2778         ret = ocfs2_xa_set(&loc, xi, ctxt);
2779         if (ret) {
2780                 if (ret != -ENOSPC)
2781                         mlog_errno(ret);
2782                 goto out;
2783         }
2784         xs->here = loc.xl_entry;
2785 
2786 out:
2787         up_write(&oi->ip_alloc_sem);
2788 
2789         return ret;
2790 }
2791 
2792 /*
2793  * ocfs2_xattr_block_find()
2794  *
2795  * Find extended attribute in external block and
2796  * fill search info into struct ocfs2_xattr_search.
2797  */
2798 static int ocfs2_xattr_block_find(struct inode *inode,
2799                                   int name_index,
2800                                   const char *name,
2801                                   struct ocfs2_xattr_search *xs)
2802 {
2803         struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2804         struct buffer_head *blk_bh = NULL;
2805         struct ocfs2_xattr_block *xb;
2806         int ret = 0;
2807 
2808         if (!di->i_xattr_loc)
2809                 return ret;
2810 
2811         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2812                                      &blk_bh);
2813         if (ret < 0) {
2814                 mlog_errno(ret);
2815                 return ret;
2816         }
2817 
2818         xs->xattr_bh = blk_bh;
2819         xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2820 
2821         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2822                 xs->header = &xb->xb_attrs.xb_header;
2823                 xs->base = (void *)xs->header;
2824                 xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2825                 xs->here = xs->header->xh_entries;
2826 
2827                 ret = ocfs2_xattr_find_entry(name_index, name, xs);
2828         } else
2829                 ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2830                                                    name_index,
2831                                                    name, xs);
2832 
2833         if (ret && ret != -ENODATA) {
2834                 xs->xattr_bh = NULL;
2835                 goto cleanup;
2836         }
2837         xs->not_found = ret;
2838         return 0;
2839 cleanup:
2840         brelse(blk_bh);
2841 
2842         return ret;
2843 }
2844 
2845 static int ocfs2_create_xattr_block(struct inode *inode,
2846                                     struct buffer_head *inode_bh,
2847                                     struct ocfs2_xattr_set_ctxt *ctxt,
2848                                     int indexed,
2849                                     struct buffer_head **ret_bh)
2850 {
2851         int ret;
2852         u16 suballoc_bit_start;
2853         u32 num_got;
2854         u64 suballoc_loc, first_blkno;
2855         struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
2856         struct buffer_head *new_bh = NULL;
2857         struct ocfs2_xattr_block *xblk;
2858 
2859         ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2860                                       inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2861         if (ret < 0) {
2862                 mlog_errno(ret);
2863                 goto end;
2864         }
2865 
2866         ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2867                                    &suballoc_loc, &suballoc_bit_start,
2868                                    &num_got, &first_blkno);
2869         if (ret < 0) {
2870                 mlog_errno(ret);
2871                 goto end;
2872         }
2873 
2874         new_bh = sb_getblk(inode->i_sb, first_blkno);
2875         if (!new_bh) {
2876                 ret = -ENOMEM;
2877                 mlog_errno(ret);
2878                 goto end;
2879         }
2880 
2881         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2882 
2883         ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2884                                       new_bh,
2885                                       OCFS2_JOURNAL_ACCESS_CREATE);
2886         if (ret < 0) {
2887                 mlog_errno(ret);
2888                 goto end;
2889         }
2890 
2891         /* Initialize ocfs2_xattr_block */
2892         xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2893         memset(xblk, 0, inode->i_sb->s_blocksize);
2894         strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2895         xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2896         xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2897         xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2898         xblk->xb_fs_generation =
2899                 cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2900         xblk->xb_blkno = cpu_to_le64(first_blkno);
2901         if (indexed) {
2902                 struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2903                 xr->xt_clusters = cpu_to_le32(1);
2904                 xr->xt_last_eb_blk = 0;
2905                 xr->xt_list.l_tree_depth = 0;
2906                 xr->xt_list.l_count = cpu_to_le16(
2907                                         ocfs2_xattr_recs_per_xb(inode->i_sb));
2908                 xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2909                 xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2910         }
2911         ocfs2_journal_dirty(ctxt->handle, new_bh);
2912 
2913         /* Add it to the inode */
2914         di->i_xattr_loc = cpu_to_le64(first_blkno);
2915 
2916         spin_lock(&OCFS2_I(inode)->ip_lock);
2917         OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2918         di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2919         spin_unlock(&OCFS2_I(inode)->ip_lock);
2920 
2921         ocfs2_journal_dirty(ctxt->handle, inode_bh);
2922 
2923         *ret_bh = new_bh;
2924         new_bh = NULL;
2925 
2926 end:
2927         brelse(new_bh);
2928         return ret;
2929 }
2930 
2931 /*
2932  * ocfs2_xattr_block_set()
2933  *
2934  * Set, replace or remove an extended attribute into external block.
2935  *
2936  */
2937 static int ocfs2_xattr_block_set(struct inode *inode,
2938                                  struct ocfs2_xattr_info *xi,
2939                                  struct ocfs2_xattr_search *xs,
2940                                  struct ocfs2_xattr_set_ctxt *ctxt)
2941 {
2942         struct buffer_head *new_bh = NULL;
2943         struct ocfs2_xattr_block *xblk = NULL;
2944         int ret;
2945         struct ocfs2_xa_loc loc;
2946 
2947         if (!xs->xattr_bh) {
2948                 ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2949                                                0, &new_bh);
2950                 if (ret) {
2951                         mlog_errno(ret);
2952                         goto end;
2953                 }
2954 
2955                 xs->xattr_bh = new_bh;
2956                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2957                 xs->header = &xblk->xb_attrs.xb_header;
2958                 xs->base = (void *)xs->header;
2959                 xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2960                 xs->here = xs->header->xh_entries;
2961         } else
2962                 xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2963 
2964         if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2965                 ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2966                                               xs->not_found ? NULL : xs->here);
2967 
2968                 ret = ocfs2_xa_set(&loc, xi, ctxt);
2969                 if (!ret)
2970                         xs->here = loc.xl_entry;
2971                 else if ((ret != -ENOSPC) || ctxt->set_abort)
2972                         goto end;
2973                 else {
2974                         ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2975                         if (ret)
2976                                 goto end;
2977                 }
2978         }
2979 
2980         if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2981                 ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2982 
2983 end:
2984         return ret;
2985 }
2986 
2987 /* Check whether the new xattr can be inserted into the inode. */
2988 static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2989                                        struct ocfs2_xattr_info *xi,
2990                                        struct ocfs2_xattr_search *xs)
2991 {
2992         struct ocfs2_xattr_entry *last;
2993         int free, i;
2994         size_t min_offs = xs->end - xs->base;
2995 
2996         if (!xs->header)
2997                 return 0;
2998 
2999         last = xs->header->xh_entries;
3000 
3001         for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
3002                 size_t offs = le16_to_cpu(last->xe_name_offset);
3003                 if (offs < min_offs)
3004                         min_offs = offs;
3005                 last += 1;
3006         }
3007 
3008         free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3009         if (free < 0)
3010                 return 0;
3011 
3012         BUG_ON(!xs->not_found);
3013 
3014         if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3015                 return 1;
3016 
3017         return 0;
3018 }
3019 
3020 static int ocfs2_calc_xattr_set_need(struct inode *inode,
3021                                      struct ocfs2_dinode *di,
3022                                      struct ocfs2_xattr_info *xi,
3023                                      struct ocfs2_xattr_search *xis,
3024                                      struct ocfs2_xattr_search *xbs,
3025                                      int *clusters_need,
3026                                      int *meta_need,
3027                                      int *credits_need)
3028 {
3029         int ret = 0, old_in_xb = 0;
3030         int clusters_add = 0, meta_add = 0, credits = 0;
3031         struct buffer_head *bh = NULL;
3032         struct ocfs2_xattr_block *xb = NULL;
3033         struct ocfs2_xattr_entry *xe = NULL;
3034         struct ocfs2_xattr_value_root *xv = NULL;
3035         char *base = NULL;
3036         int name_offset, name_len = 0;
3037         u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3038                                                     xi->xi_value_len);
3039         u64 value_size;
3040 
3041         /*
3042          * Calculate the clusters we need to write.
3043          * No matter whether we replace an old one or add a new one,
3044          * we need this for writing.
3045          */
3046         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3047                 credits += new_clusters *
3048                            ocfs2_clusters_to_blocks(inode->i_sb, 1);
3049 
3050         if (xis->not_found && xbs->not_found) {
3051                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3052 
3053                 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3054                         clusters_add += new_clusters;
3055                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3056                                                         &def_xv.xv.xr_list);
3057                 }
3058 
3059                 goto meta_guess;
3060         }
3061 
3062         if (!xis->not_found) {
3063                 xe = xis->here;
3064                 name_offset = le16_to_cpu(xe->xe_name_offset);
3065                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3066                 base = xis->base;
3067                 credits += OCFS2_INODE_UPDATE_CREDITS;
3068         } else {
3069                 int i, block_off = 0;
3070                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3071                 xe = xbs->here;
3072                 name_offset = le16_to_cpu(xe->xe_name_offset);
3073                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3074                 i = xbs->here - xbs->header->xh_entries;
3075                 old_in_xb = 1;
3076 
3077                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3078                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3079                                                         bucket_xh(xbs->bucket),
3080                                                         i, &block_off,
3081                                                         &name_offset);
3082                         base = bucket_block(xbs->bucket, block_off);
3083                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3084                 } else {
3085                         base = xbs->base;
3086                         credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3087                 }
3088         }
3089 
3090         /*
3091          * delete a xattr doesn't need metadata and cluster allocation.
3092          * so just calculate the credits and return.
3093          *
3094          * The credits for removing the value tree will be extended
3095          * by ocfs2_remove_extent itself.
3096          */
3097         if (!xi->xi_value) {
3098                 if (!ocfs2_xattr_is_local(xe))
3099                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3100 
3101                 goto out;
3102         }
3103 
3104         /* do cluster allocation guess first. */
3105         value_size = le64_to_cpu(xe->xe_value_size);
3106 
3107         if (old_in_xb) {
3108                 /*
3109                  * In xattr set, we always try to set the xe in inode first,
3110                  * so if it can be inserted into inode successfully, the old
3111                  * one will be removed from the xattr block, and this xattr
3112                  * will be inserted into inode as a new xattr in inode.
3113                  */
3114                 if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3115                         clusters_add += new_clusters;
3116                         credits += ocfs2_remove_extent_credits(inode->i_sb) +
3117                                     OCFS2_INODE_UPDATE_CREDITS;
3118                         if (!ocfs2_xattr_is_local(xe))
3119                                 credits += ocfs2_calc_extend_credits(
3120                                                         inode->i_sb,
3121                                                         &def_xv.xv.xr_list);
3122                         goto out;
3123                 }
3124         }
3125 
3126         if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3127                 /* the new values will be stored outside. */
3128                 u32 old_clusters = 0;
3129 
3130                 if (!ocfs2_xattr_is_local(xe)) {
3131                         old_clusters =  ocfs2_clusters_for_bytes(inode->i_sb,
3132                                                                  value_size);
3133                         xv = (struct ocfs2_xattr_value_root *)
3134                              (base + name_offset + name_len);
3135                         value_size = OCFS2_XATTR_ROOT_SIZE;
3136                 } else
3137                         xv = &def_xv.xv;
3138 
3139                 if (old_clusters >= new_clusters) {
3140                         credits += ocfs2_remove_extent_credits(inode->i_sb);
3141                         goto out;
3142                 } else {
3143                         meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3144                         clusters_add += new_clusters - old_clusters;
3145                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3146                                                              &xv->xr_list);
3147                         if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3148                                 goto out;
3149                 }
3150         } else {
3151                 /*
3152                  * Now the new value will be stored inside. So if the new
3153                  * value is smaller than the size of value root or the old
3154                  * value, we don't need any allocation, otherwise we have
3155                  * to guess metadata allocation.
3156                  */
3157                 if ((ocfs2_xattr_is_local(xe) &&
3158                      (value_size >= xi->xi_value_len)) ||
3159                     (!ocfs2_xattr_is_local(xe) &&
3160                      OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3161                         goto out;
3162         }
3163 
3164 meta_guess:
3165         /* calculate metadata allocation. */
3166         if (di->i_xattr_loc) {
3167                 if (!xbs->xattr_bh) {
3168                         ret = ocfs2_read_xattr_block(inode,
3169                                                      le64_to_cpu(di->i_xattr_loc),
3170                                                      &bh);
3171                         if (ret) {
3172                                 mlog_errno(ret);
3173                                 goto out;
3174                         }
3175 
3176                         xb = (struct ocfs2_xattr_block *)bh->b_data;
3177                 } else
3178                         xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3179 
3180                 /*
3181                  * If there is already an xattr tree, good, we can calculate
3182                  * like other b-trees. Otherwise we may have the chance of
3183                  * create a tree, the credit calculation is borrowed from
3184                  * ocfs2_calc_extend_credits with root_el = NULL. And the
3185                  * new tree will be cluster based, so no meta is needed.
3186                  */
3187                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3188                         struct ocfs2_extent_list *el =
3189                                  &xb->xb_attrs.xb_root.xt_list;
3190                         meta_add += ocfs2_extend_meta_needed(el);
3191                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3192                                                              el);
3193                 } else
3194                         credits += OCFS2_SUBALLOC_ALLOC + 1;
3195 
3196                 /*
3197                  * This cluster will be used either for new bucket or for
3198                  * new xattr block.
3199                  * If the cluster size is the same as the bucket size, one
3200                  * more is needed since we may need to extend the bucket
3201                  * also.
3202                  */
3203                 clusters_add += 1;
3204                 credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3205                 if (OCFS2_XATTR_BUCKET_SIZE ==
3206                         OCFS2_SB(inode->i_sb)->s_clustersize) {
3207                         credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3208                         clusters_add += 1;
3209                 }
3210         } else {
3211                 credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
3212                 if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3213                         struct ocfs2_extent_list *el = &def_xv.xv.xr_list;
3214                         meta_add += ocfs2_extend_meta_needed(el);
3215                         credits += ocfs2_calc_extend_credits(inode->i_sb,
3216                                                              el);
3217                 } else {
3218                         meta_add += 1;
3219                 }
3220         }
3221 out:
3222         if (clusters_need)
3223                 *clusters_need = clusters_add;
3224         if (meta_need)
3225                 *meta_need = meta_add;
3226         if (credits_need)
3227                 *credits_need = credits;
3228         brelse(bh);
3229         return ret;
3230 }
3231 
3232 static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3233                                      struct ocfs2_dinode *di,
3234                                      struct ocfs2_xattr_info *xi,
3235                                      struct ocfs2_xattr_search *xis,
3236                                      struct ocfs2_xattr_search *xbs,
3237                                      struct ocfs2_xattr_set_ctxt *ctxt,
3238                                      int extra_meta,
3239                                      int *credits)
3240 {
3241         int clusters_add, meta_add, ret;
3242         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3243 
3244         memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3245 
3246         ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3247 
3248         ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3249                                         &clusters_add, &meta_add, credits);
3250         if (ret) {
3251                 mlog_errno(ret);
3252                 return ret;
3253         }
3254 
3255         meta_add += extra_meta;
3256         trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3257                                         clusters_add, *credits);
3258 
3259         if (meta_add) {
3260                 ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3261                                                         &ctxt->meta_ac);
3262                 if (ret) {
3263                         mlog_errno(ret);
3264                         goto out;
3265                 }
3266         }
3267 
3268         if (clusters_add) {
3269                 ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3270                 if (ret)
3271                         mlog_errno(ret);
3272         }
3273 out:
3274         if (ret) {
3275                 if (ctxt->meta_ac) {
3276                         ocfs2_free_alloc_context(ctxt->meta_ac);
3277                         ctxt->meta_ac = NULL;
3278                 }
3279 
3280                 /*
3281                  * We cannot have an error and a non null ctxt->data_ac.
3282                  */
3283         }
3284 
3285         return ret;
3286 }
3287 
3288 static int __ocfs2_xattr_set_handle(struct inode *inode,
3289                                     struct ocfs2_dinode *di,
3290                                     struct ocfs2_xattr_info *xi,
3291                                     struct ocfs2_xattr_search *xis,
3292                                     struct ocfs2_xattr_search *xbs,
3293                                     struct ocfs2_xattr_set_ctxt *ctxt)
3294 {
3295         int ret = 0, credits, old_found;
3296 
3297         if (!xi->xi_value) {
3298                 /* Remove existing extended attribute */
3299                 if (!xis->not_found)
3300                         ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3301                 else if (!xbs->not_found)
3302                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3303         } else {
3304                 /* We always try to set extended attribute into inode first*/
3305                 ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3306                 if (!ret && !xbs->not_found) {
3307                         /*
3308                          * If succeed and that extended attribute existing in
3309                          * external block, then we will remove it.
3310                          */
3311                         xi->xi_value = NULL;
3312                         xi->xi_value_len = 0;
3313 
3314                         old_found = xis->not_found;
3315                         xis->not_found = -ENODATA;
3316                         ret = ocfs2_calc_xattr_set_need(inode,
3317                                                         di,
3318                                                         xi,
3319                                                         xis,
3320                                                         xbs,
3321                                                         NULL,
3322                                                         NULL,
3323                                                         &credits);
3324                         xis->not_found = old_found;
3325                         if (ret) {
3326                                 mlog_errno(ret);
3327                                 goto out;
3328                         }
3329 
3330                         ret = ocfs2_extend_trans(ctxt->handle, credits);
3331                         if (ret) {
3332                                 mlog_errno(ret);
3333                                 goto out;
3334                         }
3335                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3336                 } else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3337                         if (di->i_xattr_loc && !xbs->xattr_bh) {
3338                                 ret = ocfs2_xattr_block_find(inode,
3339                                                              xi->xi_name_index,
3340                                                              xi->xi_name, xbs);
3341                                 if (ret)
3342                                         goto out;
3343 
3344                                 old_found = xis->not_found;
3345                                 xis->not_found = -ENODATA;
3346                                 ret = ocfs2_calc_xattr_set_need(inode,
3347                                                                 di,
3348                                                                 xi,
3349                                                                 xis,
3350                                                                 xbs,
3351                                                                 NULL,
3352                                                                 NULL,
3353                                                                 &credits);
3354                                 xis->not_found = old_found;
3355                                 if (ret) {
3356                                         mlog_errno(ret);
3357                                         goto out;
3358                                 }
3359 
3360                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3361                                 if (ret) {
3362                                         mlog_errno(ret);
3363                                         goto out;
3364                                 }
3365                         }
3366                         /*
3367                          * If no space in inode, we will set extended attribute
3368                          * into external block.
3369                          */
3370                         ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3371                         if (ret)
3372                                 goto out;
3373                         if (!xis->not_found) {
3374                                 /*
3375                                  * If succeed and that extended attribute
3376                                  * existing in inode, we will remove it.
3377                                  */
3378                                 xi->xi_value = NULL;
3379                                 xi->xi_value_len = 0;
3380                                 xbs->not_found = -ENODATA;
3381                                 ret = ocfs2_calc_xattr_set_need(inode,
3382                                                                 di,
3383                                                                 xi,
3384                                                                 xis,
3385                                                                 xbs,
3386                                                                 NULL,
3387                                                                 NULL,
3388                                                                 &credits);
3389                                 if (ret) {
3390                                         mlog_errno(ret);
3391                                         goto out;
3392                                 }
3393 
3394                                 ret = ocfs2_extend_trans(ctxt->handle, credits);
3395                                 if (ret) {
3396                                         mlog_errno(ret);
3397                                         goto out;
3398                                 }
3399                                 ret = ocfs2_xattr_ibody_set(inode, xi,
3400                                                             xis, ctxt);
3401                         }
3402                 }
3403         }
3404 
3405         if (!ret) {
3406                 /* Update inode ctime. */
3407                 ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3408                                               xis->inode_bh,
3409                                               OCFS2_JOURNAL_ACCESS_WRITE);
3410                 if (ret) {
3411                         mlog_errno(ret);
3412                         goto out;
3413                 }
3414 
3415                 inode->i_ctime = CURRENT_TIME;
3416                 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3417                 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3418                 ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3419         }
3420 out:
3421         return ret;
3422 }
3423 
3424 /*
3425  * This function only called duing creating inode
3426  * for init security/acl xattrs of the new inode.
3427  * All transanction credits have been reserved in mknod.
3428  */
3429 int ocfs2_xattr_set_handle(handle_t *handle,
3430                            struct inode *inode,
3431                            struct buffer_head *di_bh,
3432                            int name_index,
3433                            const char *name,
3434                            const void *value,
3435                            size_t value_len,
3436                            int flags,
3437                            struct ocfs2_alloc_context *meta_ac,
3438                            struct ocfs2_alloc_context *data_ac)
3439 {
3440         struct ocfs2_dinode *di;
3441         int ret;
3442 
3443         struct ocfs2_xattr_info xi = {
3444                 .xi_name_index = name_index,
3445                 .xi_name = name,
3446                 .xi_name_len = strlen(name),
3447                 .xi_value = value,
3448                 .xi_value_len = value_len,
3449         };
3450 
3451         struct ocfs2_xattr_search xis = {
3452                 .not_found = -ENODATA,
3453         };
3454 
3455         struct ocfs2_xattr_search xbs = {
3456                 .not_found = -ENODATA,
3457         };
3458 
3459         struct ocfs2_xattr_set_ctxt ctxt = {
3460                 .handle = handle,
3461                 .meta_ac = meta_ac,
3462                 .data_ac = data_ac,
3463         };
3464 
3465         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3466                 return -EOPNOTSUPP;
3467 
3468         /*
3469          * In extreme situation, may need xattr bucket when
3470          * block size is too small. And we have already reserved
3471          * the credits for bucket in mknod.
3472          */
3473         if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3474                 xbs.bucket = ocfs2_xattr_bucket_new(inode);
3475                 if (!xbs.bucket) {
3476                         mlog_errno(-ENOMEM);
3477                         return -ENOMEM;
3478                 }
3479         }
3480 
3481         xis.inode_bh = xbs.inode_bh = di_bh;
3482         di = (struct ocfs2_dinode *)di_bh->b_data;
3483 
3484         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3485 
3486         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3487         if (ret)
3488                 goto cleanup;
3489         if (xis.not_found) {
3490                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3491                 if (ret)
3492                         goto cleanup;
3493         }
3494 
3495         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3496 
3497 cleanup:
3498         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3499         brelse(xbs.xattr_bh);
3500         ocfs2_xattr_bucket_free(xbs.bucket);
3501 
3502         return ret;
3503 }
3504 
3505 /*
3506  * ocfs2_xattr_set()
3507  *
3508  * Set, replace or remove an extended attribute for this inode.
3509  * value is NULL to remove an existing extended attribute, else either
3510  * create or replace an extended attribute.
3511  */
3512 int ocfs2_xattr_set(struct inode *inode,
3513                     int name_index,
3514                     const char *name,
3515                     const void *value,
3516                     size_t value_len,
3517                     int flags)
3518 {
3519         struct buffer_head *di_bh = NULL;
3520         struct ocfs2_dinode *di;
3521         int ret, credits, ref_meta = 0, ref_credits = 0;
3522         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3523         struct inode *tl_inode = osb->osb_tl_inode;
3524         struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, NULL, };
3525         struct ocfs2_refcount_tree *ref_tree = NULL;
3526 
3527         struct ocfs2_xattr_info xi = {
3528                 .xi_name_index = name_index,
3529                 .xi_name = name,
3530                 .xi_name_len = strlen(name),
3531                 .xi_value = value,
3532                 .xi_value_len = value_len,
3533         };
3534 
3535         struct ocfs2_xattr_search xis = {
3536                 .not_found = -ENODATA,
3537         };
3538 
3539         struct ocfs2_xattr_search xbs = {
3540                 .not_found = -ENODATA,
3541         };
3542 
3543         if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3544                 return -EOPNOTSUPP;
3545 
3546         /*
3547          * Only xbs will be used on indexed trees.  xis doesn't need a
3548          * bucket.
3549          */
3550         xbs.bucket = ocfs2_xattr_bucket_new(inode);
3551         if (!xbs.bucket) {
3552                 mlog_errno(-ENOMEM);
3553                 return -ENOMEM;
3554         }
3555 
3556         ret = ocfs2_inode_lock(inode, &di_bh, 1);
3557         if (ret < 0) {
3558                 mlog_errno(ret);
3559                 goto cleanup_nolock;
3560         }
3561         xis.inode_bh = xbs.inode_bh = di_bh;
3562         di = (struct ocfs2_dinode *)di_bh->b_data;
3563 
3564         down_write(&OCFS2_I(inode)->ip_xattr_sem);
3565         /*
3566          * Scan inode and external block to find the same name
3567          * extended attribute and collect search information.
3568          */
3569         ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3570         if (ret)
3571                 goto cleanup;
3572         if (xis.not_found) {
3573                 ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3574                 if (ret)
3575                         goto cleanup;
3576         }
3577 
3578         if (xis.not_found && xbs.not_found) {
3579                 ret = -ENODATA;
3580                 if (flags & XATTR_REPLACE)
3581                         goto cleanup;
3582                 ret = 0;
3583                 if (!value)
3584                         goto cleanup;
3585         } else {
3586                 ret = -EEXIST;
3587                 if (flags & XATTR_CREATE)
3588                         goto cleanup;
3589         }
3590 
3591         /* Check whether the value is refcounted and do some preparation. */
3592         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3593             (!xis.not_found || !xbs.not_found)) {
3594                 ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3595                                                    &xis, &xbs, &ref_tree,
3596                                                    &ref_meta, &ref_credits);
3597                 if (ret) {
3598                         mlog_errno(ret);
3599                         goto cleanup;
3600                 }
3601         }
3602 
3603         mutex_lock(&tl_inode->i_mutex);
3604 
3605         if (ocfs2_truncate_log_needs_flush(osb)) {
3606                 ret = __ocfs2_flush_truncate_log(osb);
3607                 if (ret < 0) {
3608                         mutex_unlock(&tl_inode->i_mutex);
3609                         mlog_errno(ret);
3610                         goto cleanup;
3611                 }
3612         }
3613         mutex_unlock(&tl_inode->i_mutex);
3614 
3615         ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3616                                         &xbs, &ctxt, ref_meta, &credits);
3617         if (ret) {
3618                 mlog_errno(ret);
3619                 goto cleanup;
3620         }
3621 
3622         /* we need to update inode's ctime field, so add credit for it. */
3623         credits += OCFS2_INODE_UPDATE_CREDITS;
3624         ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3625         if (IS_ERR(ctxt.handle)) {
3626                 ret = PTR_ERR(ctxt.handle);
3627                 mlog_errno(ret);
3628                 goto out_free_ac;
3629         }
3630 
3631         ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3632         ocfs2_update_inode_fsync_trans(ctxt.handle, inode, 0);
3633 
3634         ocfs2_commit_trans(osb, ctxt.handle);
3635 
3636 out_free_ac:
3637         if (ctxt.data_ac)
3638                 ocfs2_free_alloc_context(ctxt.data_ac);
3639         if (ctxt.meta_ac)
3640                 ocfs2_free_alloc_context(ctxt.meta_ac);
3641         if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3642                 ocfs2_schedule_truncate_log_flush(osb, 1);
3643         ocfs2_run_deallocs(osb, &ctxt.dealloc);
3644 
3645 cleanup:
3646         if (ref_tree)
3647                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3648         up_write(&OCFS2_I(inode)->ip_xattr_sem);
3649         if (!value && !ret) {
3650                 ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3651                 if (ret)
3652                         mlog_errno(ret);
3653         }
3654         ocfs2_inode_unlock(inode, 1);
3655 cleanup_nolock:
3656         brelse(di_bh);
3657         brelse(xbs.xattr_bh);
3658         ocfs2_xattr_bucket_free(xbs.bucket);
3659 
3660         return ret;
3661 }
3662 
3663 /*
3664  * Find the xattr extent rec which may contains name_hash.
3665  * e_cpos will be the first name hash of the xattr rec.
3666  * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3667  */
3668 static int ocfs2_xattr_get_rec(struct inode *inode,
3669                                u32 name_hash,
3670                                u64 *p_blkno,
3671                                u32 *e_cpos,
3672                                u32 *num_clusters,
3673                                struct ocfs2_extent_list *el)
3674 {
3675         int ret = 0, i;
3676         struct buffer_head *eb_bh = NULL;
3677         struct ocfs2_extent_block *eb;
3678         struct ocfs2_extent_rec *rec = NULL;
3679         u64 e_blkno = 0;
3680 
3681         if (el->l_tree_depth) {
3682                 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3683                                       &eb_bh);
3684                 if (ret) {
3685                         mlog_errno(ret);
3686                         goto out;
3687                 }
3688 
3689                 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3690                 el = &eb->h_list;
3691 
3692                 if (el->l_tree_depth) {
3693                         ocfs2_error(inode->i_sb,
3694                                     "Inode %lu has non zero tree depth in "
3695                                     "xattr tree block %llu\n", inode->i_ino,
3696                                     (unsigned long long)eb_bh->b_blocknr);
3697                         ret = -EROFS;
3698                         goto out;
3699                 }
3700         }
3701 
3702         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3703                 rec = &el->l_recs[i];
3704 
3705                 if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3706                         e_blkno = le64_to_cpu(rec->e_blkno);
3707                         break;
3708                 }
3709         }
3710 
3711         if (!e_blkno) {
3712                 ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3713                             "record (%u, %u, 0) in xattr", inode->i_ino,
3714                             le32_to_cpu(rec->e_cpos),
3715                             ocfs2_rec_clusters(el, rec));
3716                 ret = -EROFS;
3717                 goto out;
3718         }
3719 
3720         *p_blkno = le64_to_cpu(rec->e_blkno);
3721         *num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3722         if (e_cpos)
3723                 *e_cpos = le32_to_cpu(rec->e_cpos);
3724 out:
3725         brelse(eb_bh);
3726         return ret;
3727 }
3728 
3729 typedef int (xattr_bucket_func)(struct inode *inode,
3730                                 struct ocfs2_xattr_bucket *bucket,
3731                                 void *para);
3732 
3733 static int ocfs2_find_xe_in_bucket(struct inode *inode,
3734                                    struct ocfs2_xattr_bucket *bucket,
3735                                    int name_index,
3736                                    const char *name,
3737                                    u32 name_hash,
3738                                    u16 *xe_index,
3739                                    int *found)
3740 {
3741         int i, ret = 0, cmp = 1, block_off, new_offset;
3742         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3743         size_t name_len = strlen(name);
3744         struct ocfs2_xattr_entry *xe = NULL;
3745         char *xe_name;
3746 
3747         /*
3748          * We don't use binary search in the bucket because there
3749          * may be multiple entries with the same name hash.
3750          */
3751         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3752                 xe = &xh->xh_entries[i];
3753 
3754                 if (name_hash > le32_to_cpu(xe->xe_name_hash))
3755                         continue;
3756                 else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3757                         break;
3758 
3759                 cmp = name_index - ocfs2_xattr_get_type(xe);
3760                 if (!cmp)
3761                         cmp = name_len - xe->xe_name_len;
3762                 if (cmp)
3763                         continue;
3764 
3765                 ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3766                                                         xh,
3767                                                         i,
3768                                                         &block_off,
3769                                                         &new_offset);
3770                 if (ret) {
3771                         mlog_errno(ret);
3772                         break;
3773                 }
3774 
3775 
3776                 xe_name = bucket_block(bucket, block_off) + new_offset;
3777                 if (!memcmp(name, xe_name, name_len)) {
3778                         *xe_index = i;
3779                         *found = 1;
3780                         ret = 0;
3781                         break;
3782                 }
3783         }
3784 
3785         return ret;
3786 }
3787 
3788 /*
3789  * Find the specified xattr entry in a series of buckets.
3790  * This series start from p_blkno and last for num_clusters.
3791  * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3792  * the num of the valid buckets.
3793  *
3794  * Return the buffer_head this xattr should reside in. And if the xattr's
3795  * hash is in the gap of 2 buckets, return the lower bucket.
3796  */
3797 static int ocfs2_xattr_bucket_find(struct inode *inode,
3798                                    int name_index,
3799                                    const char *name,
3800                                    u32 name_hash,
3801                                    u64 p_blkno,
3802                                    u32 first_hash,
3803                                    u32 num_clusters,
3804                                    struct ocfs2_xattr_search *xs)
3805 {
3806         int ret, found = 0;
3807         struct ocfs2_xattr_header *xh = NULL;
3808         struct ocfs2_xattr_entry *xe = NULL;
3809         u16 index = 0;
3810         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3811         int low_bucket = 0, bucket, high_bucket;
3812         struct ocfs2_xattr_bucket *search;
3813         u32 last_hash;
3814         u64 blkno, lower_blkno = 0;
3815 
3816         search = ocfs2_xattr_bucket_new(inode);
3817         if (!search) {
3818                 ret = -ENOMEM;
3819                 mlog_errno(ret);
3820                 goto out;
3821         }
3822 
3823         ret = ocfs2_read_xattr_bucket(search, p_blkno);
3824         if (ret) {
3825                 mlog_errno(ret);
3826                 goto out;
3827         }
3828 
3829         xh = bucket_xh(search);
3830         high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3831         while (low_bucket <= high_bucket) {
3832                 ocfs2_xattr_bucket_relse(search);
3833 
3834                 bucket = (low_bucket + high_bucket) / 2;
3835                 blkno = p_blkno + bucket * blk_per_bucket;
3836                 ret = ocfs2_read_xattr_bucket(search, blkno);
3837                 if (ret) {
3838                         mlog_errno(ret);
3839                         goto out;
3840                 }
3841 
3842                 xh = bucket_xh(search);
3843                 xe = &xh->xh_entries[0];
3844                 if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3845                         high_bucket = bucket - 1;
3846                         continue;
3847                 }
3848 
3849                 /*
3850                  * Check whether the hash of the last entry in our
3851                  * bucket is larger than the search one. for an empty
3852                  * bucket, the last one is also the first one.
3853                  */
3854                 if (xh->xh_count)
3855                         xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3856 
3857                 last_hash = le32_to_cpu(xe->xe_name_hash);
3858 
3859                 /* record lower_blkno which may be the insert place. */
3860                 lower_blkno = blkno;
3861 
3862                 if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3863                         low_bucket = bucket + 1;
3864                         continue;
3865                 }
3866 
3867                 /* the searched xattr should reside in this bucket if exists. */
3868                 ret = ocfs2_find_xe_in_bucket(inode, search,
3869                                               name_index, name, name_hash,
3870                                               &index, &found);
3871                 if (ret) {
3872                         mlog_errno(ret);
3873                         goto out;
3874                 }
3875                 break;
3876         }
3877 
3878         /*
3879          * Record the bucket we have found.
3880          * When the xattr's hash value is in the gap of 2 buckets, we will
3881          * always set it to the previous bucket.
3882          */
3883         if (!lower_blkno)
3884                 lower_blkno = p_blkno;
3885 
3886         /* This should be in cache - we just read it during the search */
3887         ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3888         if (ret) {
3889                 mlog_errno(ret);
3890                 goto out;
3891         }
3892 
3893         xs->header = bucket_xh(xs->bucket);
3894         xs->base = bucket_block(xs->bucket, 0);
3895         xs->end = xs->base + inode->i_sb->s_blocksize;
3896 
3897         if (found) {
3898                 xs->here = &xs->header->xh_entries[index];
3899                 trace_ocfs2_xattr_bucket_find(OCFS2_I(inode)->ip_blkno,
3900                         name, name_index, name_hash,
3901                         (unsigned long long)bucket_blkno(xs->bucket),
3902                         index);
3903         } else
3904                 ret = -ENODATA;
3905 
3906 out:
3907         ocfs2_xattr_bucket_free(search);
3908         return ret;
3909 }
3910 
3911 static int ocfs2_xattr_index_block_find(struct inode *inode,
3912                                         struct buffer_head *root_bh,
3913                                         int name_index,
3914                                         const char *name,
3915                                         struct ocfs2_xattr_search *xs)
3916 {
3917         int ret;
3918         struct ocfs2_xattr_block *xb =
3919                         (struct ocfs2_xattr_block *)root_bh->b_data;
3920         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3921         struct ocfs2_extent_list *el = &xb_root->xt_list;
3922         u64 p_blkno = 0;
3923         u32 first_hash, num_clusters = 0;
3924         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3925 
3926         if (le16_to_cpu(el->l_next_free_rec) == 0)
3927                 return -ENODATA;
3928 
3929         trace_ocfs2_xattr_index_block_find(OCFS2_I(inode)->ip_blkno,
3930                                         name, name_index, name_hash,
3931                                         (unsigned long long)root_bh->b_blocknr,
3932                                         -1);
3933 
3934         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3935                                   &num_clusters, el);
3936         if (ret) {
3937                 mlog_errno(ret);
3938                 goto out;
3939         }
3940 
3941         BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3942 
3943         trace_ocfs2_xattr_index_block_find_rec(OCFS2_I(inode)->ip_blkno,
3944                                         name, name_index, first_hash,
3945                                         (unsigned long long)p_blkno,
3946                                         num_clusters);
3947 
3948         ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3949                                       p_blkno, first_hash, num_clusters, xs);
3950 
3951 out:
3952         return ret;
3953 }
3954 
3955 static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3956                                        u64 blkno,
3957                                        u32 clusters,
3958                                        xattr_bucket_func *func,
3959                                        void *para)
3960 {
3961         int i, ret = 0;
3962         u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3963         u32 num_buckets = clusters * bpc;
3964         struct ocfs2_xattr_bucket *bucket;
3965 
3966         bucket = ocfs2_xattr_bucket_new(inode);
3967         if (!bucket) {
3968                 mlog_errno(-ENOMEM);
3969                 return -ENOMEM;
3970         }
3971 
3972         trace_ocfs2_iterate_xattr_buckets(
3973                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
3974                 (unsigned long long)blkno, clusters);
3975 
3976         for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3977                 ret = ocfs2_read_xattr_bucket(bucket, blkno);
3978                 if (ret) {
3979                         mlog_errno(ret);
3980                         break;
3981                 }
3982 
3983                 /*
3984                  * The real bucket num in this series of blocks is stored
3985                  * in the 1st bucket.
3986                  */
3987                 if (i == 0)
3988                         num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3989 
3990                 trace_ocfs2_iterate_xattr_bucket((unsigned long long)blkno,
3991                      le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3992                 if (func) {
3993                         ret = func(inode, bucket, para);
3994                         if (ret && ret != -ERANGE)
3995                                 mlog_errno(ret);
3996                         /* Fall through to bucket_relse() */
3997                 }
3998 
3999                 ocfs2_xattr_bucket_relse(bucket);
4000                 if (ret)
4001                         break;
4002         }
4003 
4004         ocfs2_xattr_bucket_free(bucket);
4005         return ret;
4006 }
4007 
4008 struct ocfs2_xattr_tree_list {
4009         char *buffer;
4010         size_t buffer_size;
4011         size_t result;
4012 };
4013 
4014 static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
4015                                              struct ocfs2_xattr_header *xh,
4016                                              int index,
4017                                              int *block_off,
4018                                              int *new_offset)
4019 {
4020         u16 name_offset;
4021 
4022         if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4023                 return -EINVAL;
4024 
4025         name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4026 
4027         *block_off = name_offset >> sb->s_blocksize_bits;
4028         *new_offset = name_offset % sb->s_blocksize;
4029 
4030         return 0;
4031 }
4032 
4033 static int ocfs2_list_xattr_bucket(struct inode *inode,
4034                                    struct ocfs2_xattr_bucket *bucket,
4035                                    void *para)
4036 {
4037         int ret = 0, type;
4038         struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4039         int i, block_off, new_offset;
4040         const char *prefix, *name;
4041 
4042         for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4043                 struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4044                 type = ocfs2_xattr_get_type(entry);
4045                 prefix = ocfs2_xattr_prefix(type);
4046 
4047                 if (prefix) {
4048                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4049                                                                 bucket_xh(bucket),
4050                                                                 i,
4051                                                                 &block_off,
4052                                                                 &new_offset);
4053                         if (ret)
4054                                 break;
4055 
4056                         name = (const char *)bucket_block(bucket, block_off) +
4057                                 new_offset;
4058                         ret = ocfs2_xattr_list_entry(xl->buffer,
4059                                                      xl->buffer_size,
4060                                                      &xl->result,
4061                                                      prefix, name,
4062                                                      entry->xe_name_len);
4063                         if (ret)
4064                                 break;
4065                 }
4066         }
4067 
4068         return ret;
4069 }
4070 
4071 static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4072                                            struct buffer_head *blk_bh,
4073                                            xattr_tree_rec_func *rec_func,
4074                                            void *para)
4075 {
4076         struct ocfs2_xattr_block *xb =
4077                         (struct ocfs2_xattr_block *)blk_bh->b_data;
4078         struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4079         int ret = 0;
4080         u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4081         u64 p_blkno = 0;
4082 
4083         if (!el->l_next_free_rec || !rec_func)
4084                 return 0;
4085 
4086         while (name_hash > 0) {
4087                 ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4088                                           &e_cpos, &num_clusters, el);
4089                 if (ret) {
4090                         mlog_errno(ret);
4091                         break;
4092                 }
4093 
4094                 ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4095                                num_clusters, para);
4096                 if (ret) {
4097                         if (ret != -ERANGE)
4098                                 mlog_errno(ret);
4099                         break;
4100                 }
4101 
4102                 if (e_cpos == 0)
4103                         break;
4104 
4105                 name_hash = e_cpos - 1;
4106         }
4107 
4108         return ret;
4109 
4110 }
4111 
4112 static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4113                                      struct buffer_head *root_bh,
4114                                      u64 blkno, u32 cpos, u32 len, void *para)
4115 {
4116         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4117                                            ocfs2_list_xattr_bucket, para);
4118 }
4119 
4120 static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4121                                              struct buffer_head *blk_bh,
4122                                              char *buffer,
4123                                              size_t buffer_size)
4124 {
4125         int ret;
4126         struct ocfs2_xattr_tree_list xl = {
4127                 .buffer = buffer,
4128                 .buffer_size = buffer_size,
4129                 .result = 0,
4130         };
4131 
4132         ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4133                                               ocfs2_list_xattr_tree_rec, &xl);
4134         if (ret) {
4135                 mlog_errno(ret);
4136                 goto out;
4137         }
4138 
4139         ret = xl.result;
4140 out:
4141         return ret;
4142 }
4143 
4144 static int cmp_xe(const void *a, const void *b)
4145 {
4146         const struct ocfs2_xattr_entry *l = a, *r = b;
4147         u32 l_hash = le32_to_cpu(l->xe_name_hash);
4148         u32 r_hash = le32_to_cpu(r->xe_name_hash);
4149 
4150         if (l_hash > r_hash)
4151                 return 1;
4152         if (l_hash < r_hash)
4153                 return -1;
4154         return 0;
4155 }
4156 
4157 static void swap_xe(void *a, void *b, int size)
4158 {
4159         struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4160 
4161         tmp = *l;
4162         memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4163         memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4164 }
4165 
4166 /*
4167  * When the ocfs2_xattr_block is filled up, new bucket will be created
4168  * and all the xattr entries will be moved to the new bucket.
4169  * The header goes at the start of the bucket, and the names+values are
4170  * filled from the end.  This is why *target starts as the last buffer.
4171  * Note: we need to sort the entries since they are not saved in order
4172  * in the ocfs2_xattr_block.
4173  */
4174 static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4175                                            struct buffer_head *xb_bh,
4176                                            struct ocfs2_xattr_bucket *bucket)
4177 {
4178         int i, blocksize = inode->i_sb->s_blocksize;
4179         int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4180         u16 offset, size, off_change;
4181         struct ocfs2_xattr_entry *xe;
4182         struct ocfs2_xattr_block *xb =
4183                                 (struct ocfs2_xattr_block *)xb_bh->b_data;
4184         struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4185         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4186         u16 count = le16_to_cpu(xb_xh->xh_count);
4187         char *src = xb_bh->b_data;
4188         char *target = bucket_block(bucket, blks - 1);
4189 
4190         trace_ocfs2_cp_xattr_block_to_bucket_begin(
4191                                 (unsigned long long)xb_bh->b_blocknr,
4192                                 (unsigned long long)bucket_blkno(bucket));
4193 
4194         for (i = 0; i < blks; i++)
4195                 memset(bucket_block(bucket, i), 0, blocksize);
4196 
4197         /*
4198          * Since the xe_name_offset is based on ocfs2_xattr_header,
4199          * there is a offset change corresponding to the change of
4200          * ocfs2_xattr_header's position.
4201          */
4202         off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4203         xe = &xb_xh->xh_entries[count - 1];
4204         offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4205         size = blocksize - offset;
4206 
4207         /* copy all the names and values. */
4208         memcpy(target + offset, src + offset, size);
4209 
4210         /* Init new header now. */
4211         xh->xh_count = xb_xh->xh_count;
4212         xh->xh_num_buckets = cpu_to_le16(1);
4213         xh->xh_name_value_len = cpu_to_le16(size);
4214         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4215 
4216         /* copy all the entries. */
4217         target = bucket_block(bucket, 0);
4218         offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4219         size = count * sizeof(struct ocfs2_xattr_entry);
4220         memcpy(target + offset, (char *)xb_xh + offset, size);
4221 
4222         /* Change the xe offset for all the xe because of the move. */
4223         off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4224                  offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4225         for (i = 0; i < count; i++)
4226                 le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4227 
4228         trace_ocfs2_cp_xattr_block_to_bucket_end(offset, size, off_change);
4229 
4230         sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4231              cmp_xe, swap_xe);
4232 }
4233 
4234 /*
4235  * After we move xattr from block to index btree, we have to
4236  * update ocfs2_xattr_search to the new xe and base.
4237  *
4238  * When the entry is in xattr block, xattr_bh indicates the storage place.
4239  * While if the entry is in index b-tree, "bucket" indicates the
4240  * real place of the xattr.
4241  */
4242 static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4243                                             struct ocfs2_xattr_search *xs,
4244                                             struct buffer_head *old_bh)
4245 {
4246         char *buf = old_bh->b_data;
4247         struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4248         struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4249         int i;
4250 
4251         xs->header = bucket_xh(xs->bucket);
4252         xs->base = bucket_block(xs->bucket, 0);
4253         xs->end = xs->base + inode->i_sb->s_blocksize;
4254 
4255         if (xs->not_found)
4256                 return;
4257 
4258         i = xs->here - old_xh->xh_entries;
4259         xs->here = &xs->header->xh_entries[i];
4260 }
4261 
4262 static int ocfs2_xattr_create_index_block(struct inode *inode,
4263                                           struct ocfs2_xattr_search *xs,
4264                                           struct ocfs2_xattr_set_ctxt *ctxt)
4265 {
4266         int ret;
4267         u32 bit_off, len;
4268         u64 blkno;
4269         handle_t *handle = ctxt->handle;
4270         struct ocfs2_inode_info *oi = OCFS2_I(inode);
4271         struct buffer_head *xb_bh = xs->xattr_bh;
4272         struct ocfs2_xattr_block *xb =
4273                         (struct ocfs2_xattr_block *)xb_bh->b_data;
4274         struct ocfs2_xattr_tree_root *xr;
4275         u16 xb_flags = le16_to_cpu(xb->xb_flags);
4276 
4277         trace_ocfs2_xattr_create_index_block_begin(
4278                                 (unsigned long long)xb_bh->b_blocknr);
4279 
4280         BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4281         BUG_ON(!xs->bucket);
4282 
4283         /*
4284          * XXX:
4285          * We can use this lock for now, and maybe move to a dedicated mutex
4286          * if performance becomes a problem later.
4287          */
4288         down_write(&oi->ip_alloc_sem);
4289 
4290         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4291                                       OCFS2_JOURNAL_ACCESS_WRITE);
4292         if (ret) {
4293                 mlog_errno(ret);
4294                 goto out;
4295         }
4296 
4297         ret = __ocfs2_claim_clusters(handle, ctxt->data_ac,
4298                                      1, 1, &bit_off, &len);
4299         if (ret) {
4300                 mlog_errno(ret);
4301                 goto out;
4302         }
4303 
4304         /*
4305          * The bucket may spread in many blocks, and
4306          * we will only touch the 1st block and the last block
4307          * in the whole bucket(one for entry and one for data).
4308          */
4309         blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4310 
4311         trace_ocfs2_xattr_create_index_block((unsigned long long)blkno);
4312 
4313         ret = ocfs2_init_xattr_bucket(xs->bucket, blkno, 1);
4314         if (ret) {
4315                 mlog_errno(ret);
4316                 goto out;
4317         }
4318 
4319         ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4320                                                 OCFS2_JOURNAL_ACCESS_CREATE);
4321         if (ret) {
4322                 mlog_errno(ret);
4323                 goto out;
4324         }
4325 
4326         ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4327         ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4328 
4329         ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4330 
4331         /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4332         memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4333                offsetof(struct ocfs2_xattr_block, xb_attrs));
4334 
4335         xr = &xb->xb_attrs.xb_root;
4336         xr->xt_clusters = cpu_to_le32(1);
4337         xr->xt_last_eb_blk = 0;
4338         xr->xt_list.l_tree_depth = 0;
4339         xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4340         xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4341 
4342         xr->xt_list.l_recs[0].e_cpos = 0;
4343         xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4344         xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4345 
4346         xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4347 
4348         ocfs2_journal_dirty(handle, xb_bh);
4349 
4350 out:
4351         up_write(&oi->ip_alloc_sem);
4352 
4353         return ret;
4354 }
4355 
4356 static int cmp_xe_offset(const void *a, const void *b)
4357 {
4358         const struct ocfs2_xattr_entry *l = a, *r = b;
4359         u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4360         u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4361 
4362         if (l_name_offset < r_name_offset)
4363                 return 1;
4364         if (l_name_offset > r_name_offset)
4365                 return -1;
4366         return 0;
4367 }
4368 
4369 /*
4370  * defrag a xattr bucket if we find that the bucket has some
4371  * holes beteen name/value pairs.
4372  * We will move all the name/value pairs to the end of the bucket
4373  * so that we can spare some space for insertion.
4374  */
4375 static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4376                                      handle_t *handle,
4377                                      struct ocfs2_xattr_bucket *bucket)
4378 {
4379         int ret, i;
4380         size_t end, offset, len;
4381         struct ocfs2_xattr_header *xh;
4382         char *entries, *buf, *bucket_buf = NULL;
4383         u64 blkno = bucket_blkno(bucket);
4384         u16 xh_free_start;
4385         size_t blocksize = inode->i_sb->s_blocksize;
4386         struct ocfs2_xattr_entry *xe;
4387 
4388         /*
4389          * In order to make the operation more efficient and generic,
4390          * we copy all the blocks into a contiguous memory and do the
4391          * defragment there, so if anything is error, we will not touch
4392          * the real block.
4393          */
4394         bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4395         if (!bucket_buf) {
4396                 ret = -EIO;
4397                 goto out;
4398         }
4399 
4400         buf = bucket_buf;
4401         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4402                 memcpy(buf, bucket_block(bucket, i), blocksize);
4403 
4404         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4405                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4406         if (ret < 0) {
4407                 mlog_errno(ret);
4408                 goto out;
4409         }
4410 
4411         xh = (struct ocfs2_xattr_header *)bucket_buf;
4412         entries = (char *)xh->xh_entries;
4413         xh_free_start = le16_to_cpu(xh->xh_free_start);
4414 
4415         trace_ocfs2_defrag_xattr_bucket(
4416              (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4417              xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4418 
4419         /*
4420          * sort all the entries by their offset.
4421          * the largest will be the first, so that we can
4422          * move them to the end one by one.
4423          */
4424         sort(entries, le16_to_cpu(xh->xh_count),
4425              sizeof(struct ocfs2_xattr_entry),
4426              cmp_xe_offset, swap_xe);
4427 
4428         /* Move all name/values to the end of the bucket. */
4429         xe = xh->xh_entries;
4430         end = OCFS2_XATTR_BUCKET_SIZE;
4431         for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4432                 offset = le16_to_cpu(xe->xe_name_offset);
4433                 len = namevalue_size_xe(xe);
4434 
4435                 /*
4436                  * We must make sure that the name/value pair
4437                  * exist in the same block. So adjust end to
4438                  * the previous block end if needed.
4439                  */
4440                 if (((end - len) / blocksize !=
4441                         (end - 1) / blocksize))
4442                         end = end - end % blocksize;
4443 
4444                 if (end > offset + len) {
4445                         memmove(bucket_buf + end - len,
4446                                 bucket_buf + offset, len);
4447                         xe->xe_name_offset = cpu_to_le16(end - len);
4448                 }
4449 
4450                 mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4451                                 "bucket %llu\n", (unsigned long long)blkno);
4452 
4453                 end -= len;
4454         }
4455 
4456         mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4457                         "bucket %llu\n", (unsigned long long)blkno);
4458 
4459         if (xh_free_start == end)
4460                 goto out;
4461 
4462         memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4463         xh->xh_free_start = cpu_to_le16(end);
4464 
4465         /* sort the entries by their name_hash. */
4466         sort(entries, le16_to_cpu(xh->xh_count),
4467              sizeof(struct ocfs2_xattr_entry),
4468              cmp_xe, swap_xe);
4469 
4470         buf = bucket_buf;
4471         for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4472                 memcpy(bucket_block(bucket, i), buf, blocksize);
4473         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4474 
4475 out:
4476         kfree(bucket_buf);
4477         return ret;
4478 }
4479 
4480 /*
4481  * prev_blkno points to the start of an existing extent.  new_blkno
4482  * points to a newly allocated extent.  Because we know each of our
4483  * clusters contains more than bucket, we can easily split one cluster
4484  * at a bucket boundary.  So we take the last cluster of the existing
4485  * extent and split it down the middle.  We move the last half of the
4486  * buckets in the last cluster of the existing extent over to the new
4487  * extent.
4488  *
4489  * first_bh is the buffer at prev_blkno so we can update the existing
4490  * extent's bucket count.  header_bh is the bucket were we were hoping
4491  * to insert our xattr.  If the bucket move places the target in the new
4492  * extent, we'll update first_bh and header_bh after modifying the old
4493  * extent.
4494  *
4495  * first_hash will be set as the 1st xe's name_hash in the new extent.
4496  */
4497 static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4498                                                handle_t *handle,
4499                                                struct ocfs2_xattr_bucket *first,
4500                                                struct ocfs2_xattr_bucket *target,
4501                                                u64 new_blkno,
4502                                                u32 num_clusters,
4503                                                u32 *first_hash)
4504 {
4505         int ret;
4506         struct super_block *sb = inode->i_sb;
4507         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4508         int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4509         int to_move = num_buckets / 2;
4510         u64 src_blkno;
4511         u64 last_cluster_blkno = bucket_blkno(first) +
4512                 ((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4513 
4514         BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4515         BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4516 
4517         trace_ocfs2_mv_xattr_bucket_cross_cluster(
4518                                 (unsigned long long)last_cluster_blkno,
4519                                 (unsigned long long)new_blkno);
4520 
4521         ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4522                                      last_cluster_blkno, new_blkno,
4523                                      to_move, first_hash);
4524         if (ret) {
4525                 mlog_errno(ret);
4526                 goto out;
4527         }
4528 
4529         /* This is the first bucket that got moved */
4530         src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4531 
4532         /*
4533          * If the target bucket was part of the moved buckets, we need to
4534          * update first and target.
4535          */
4536         if (bucket_blkno(target) >= src_blkno) {
4537                 /* Find the block for the new target bucket */
4538                 src_blkno = new_blkno +
4539                         (bucket_blkno(target) - src_blkno);
4540 
4541                 ocfs2_xattr_bucket_relse(first);
4542                 ocfs2_xattr_bucket_relse(target);
4543 
4544                 /*
4545                  * These shouldn't fail - the buffers are in the
4546                  * journal from ocfs2_cp_xattr_bucket().
4547                  */
4548                 ret = ocfs2_read_xattr_bucket(first, new_blkno);
4549                 if (ret) {
4550                         mlog_errno(ret);
4551                         goto out;
4552                 }
4553                 ret = ocfs2_read_xattr_bucket(target, src_blkno);
4554                 if (ret)
4555                         mlog_errno(ret);
4556 
4557         }
4558 
4559 out:
4560         return ret;
4561 }
4562 
4563 /*
4564  * Find the suitable pos when we divide a bucket into 2.
4565  * We have to make sure the xattrs with the same hash value exist
4566  * in the same bucket.
4567  *
4568  * If this ocfs2_xattr_header covers more than one hash value, find a
4569  * place where the hash value changes.  Try to find the most even split.
4570  * The most common case is that all entries have different hash values,
4571  * and the first check we make will find a place to split.
4572  */
4573 static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4574 {
4575         struct ocfs2_xattr_entry *entries = xh->xh_entries;
4576         int count = le16_to_cpu(xh->xh_count);
4577         int delta, middle = count / 2;
4578 
4579         /*
4580          * We start at the middle.  Each step gets farther away in both
4581          * directions.  We therefore hit the change in hash value
4582          * nearest to the middle.  Note that this loop does not execute for
4583          * count < 2.
4584          */
4585         for (delta = 0; delta < middle; delta++) {
4586                 /* Let's check delta earlier than middle */
4587                 if (cmp_xe(&entries[middle - delta - 1],
4588                            &entries[middle - delta]))
4589                         return middle - delta;
4590 
4591                 /* For even counts, don't walk off the end */
4592                 if ((middle + delta + 1) == count)
4593                         continue;
4594 
4595                 /* Now try delta past middle */
4596                 if (cmp_xe(&entries[middle + delta],
4597                            &entries[middle + delta + 1]))
4598                         return middle + delta + 1;
4599         }
4600 
4601         /* Every entry had the same hash */
4602         return count;
4603 }
4604 
4605 /*
4606  * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4607  * first_hash will record the 1st hash of the new bucket.
4608  *
4609  * Normally half of the xattrs will be moved.  But we have to make
4610  * sure that the xattrs with the same hash value are stored in the
4611  * same bucket. If all the xattrs in this bucket have the same hash
4612  * value, the new bucket will be initialized as an empty one and the
4613  * first_hash will be initialized as (hash_value+1).
4614  */
4615 static int ocfs2_divide_xattr_bucket(struct inode *inode,
4616                                     handle_t *handle,
4617                                     u64 blk,
4618                                     u64 new_blk,
4619                                     u32 *first_hash,
4620                                     int new_bucket_head)
4621 {
4622         int ret, i;
4623         int count, start, len, name_value_len = 0, name_offset = 0;
4624         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4625         struct ocfs2_xattr_header *xh;
4626         struct ocfs2_xattr_entry *xe;
4627         int blocksize = inode->i_sb->s_blocksize;
4628 
4629         trace_ocfs2_divide_xattr_bucket_begin((unsigned long long)blk,
4630                                               (unsigned long long)new_blk);
4631 
4632         s_bucket = ocfs2_xattr_bucket_new(inode);
4633         t_bucket = ocfs2_xattr_bucket_new(inode);
4634         if (!s_bucket || !t_bucket) {
4635                 ret = -ENOMEM;
4636                 mlog_errno(ret);
4637                 goto out;
4638         }
4639 
4640         ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4641         if (ret) {
4642                 mlog_errno(ret);
4643                 goto out;
4644         }
4645 
4646         ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4647                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4648         if (ret) {
4649                 mlog_errno(ret);
4650                 goto out;
4651         }
4652 
4653         /*
4654          * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
4655          * there's no need to read it.
4656          */
4657         ret = ocfs2_init_xattr_bucket(t_bucket, new_blk, new_bucket_head);
4658         if (ret) {
4659                 mlog_errno(ret);
4660                 goto out;
4661         }
4662 
4663         /*
4664          * Hey, if we're overwriting t_bucket, what difference does
4665          * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
4666          * same part of ocfs2_cp_xattr_bucket().
4667          */
4668         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4669                                                 new_bucket_head ?
4670                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4671                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4672         if (ret) {
4673                 mlog_errno(ret);
4674                 goto out;
4675         }
4676 
4677         xh = bucket_xh(s_bucket);
4678         count = le16_to_cpu(xh->xh_count);
4679         start = ocfs2_xattr_find_divide_pos(xh);
4680 
4681         if (start == count) {
4682                 xe = &xh->xh_entries[start-1];
4683 
4684                 /*
4685                  * initialized a new empty bucket here.
4686                  * The hash value is set as one larger than
4687                  * that of the last entry in the previous bucket.
4688                  */
4689                 for (i = 0; i < t_bucket->bu_blocks; i++)
4690                         memset(bucket_block(t_bucket, i), 0, blocksize);
4691 
4692                 xh = bucket_xh(t_bucket);
4693                 xh->xh_free_start = cpu_to_le16(blocksize);
4694                 xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4695                 le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4696 
4697                 goto set_num_buckets;
4698         }
4699 
4700         /* copy the whole bucket to the new first. */
4701         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4702 
4703         /* update the new bucket. */
4704         xh = bucket_xh(t_bucket);
4705 
4706         /*
4707          * Calculate the total name/value len and xh_free_start for
4708          * the old bucket first.
4709          */
4710         name_offset = OCFS2_XATTR_BUCKET_SIZE;
4711         name_value_len = 0;
4712         for (i = 0; i < start; i++) {
4713                 xe = &xh->xh_entries[i];
4714                 name_value_len += namevalue_size_xe(xe);
4715                 if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4716                         name_offset = le16_to_cpu(xe->xe_name_offset);
4717         }
4718 
4719         /*
4720          * Now begin the modification to the new bucket.
4721          *
4722          * In the new bucket, We just move the xattr entry to the beginning
4723          * and don't touch the name/value. So there will be some holes in the
4724          * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4725          * called.
4726          */
4727         xe = &xh->xh_entries[start];
4728         len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4729         trace_ocfs2_divide_xattr_bucket_move(len,
4730                         (int)((char *)xe - (char *)xh),
4731                         (int)((char *)xh->xh_entries - (char *)xh));
4732         memmove((char *)xh->xh_entries, (char *)xe, len);
4733         xe = &xh->xh_entries[count - start];
4734         len = sizeof(struct ocfs2_xattr_entry) * start;
4735         memset((char *)xe, 0, len);
4736 
4737         le16_add_cpu(&xh->xh_count, -start);
4738         le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4739 
4740         /* Calculate xh_free_start for the new bucket. */
4741         xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4742         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4743                 xe = &xh->xh_entries[i];
4744                 if (le16_to_cpu(xe->xe_name_offset) <
4745                     le16_to_cpu(xh->xh_free_start))
4746                         xh->xh_free_start = xe->xe_name_offset;
4747         }
4748 
4749 set_num_buckets:
4750         /* set xh->xh_num_buckets for the new xh. */
4751         if (new_bucket_head)
4752                 xh->xh_num_buckets = cpu_to_le16(1);
4753         else
4754                 xh->xh_num_buckets = 0;
4755 
4756         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4757 
4758         /* store the first_hash of the new bucket. */
4759         if (first_hash)
4760                 *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4761 
4762         /*
4763          * Now only update the 1st block of the old bucket.  If we
4764          * just added a new empty bucket, there is no need to modify
4765          * it.
4766          */
4767         if (start == count)
4768                 goto out;
4769 
4770         xh = bucket_xh(s_bucket);
4771         memset(&xh->xh_entries[start], 0,
4772                sizeof(struct ocfs2_xattr_entry) * (count - start));
4773         xh->xh_count = cpu_to_le16(start);
4774         xh->xh_free_start = cpu_to_le16(name_offset);
4775         xh->xh_name_value_len = cpu_to_le16(name_value_len);
4776 
4777         ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4778 
4779 out:
4780         ocfs2_xattr_bucket_free(s_bucket);
4781         ocfs2_xattr_bucket_free(t_bucket);
4782 
4783         return ret;
4784 }
4785 
4786 /*
4787  * Copy xattr from one bucket to another bucket.
4788  *
4789  * The caller must make sure that the journal transaction
4790  * has enough space for journaling.
4791  */
4792 static int ocfs2_cp_xattr_bucket(struct inode *inode,
4793                                  handle_t *handle,
4794                                  u64 s_blkno,
4795                                  u64 t_blkno,
4796                                  int t_is_new)
4797 {
4798         int ret;
4799         struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4800 
4801         BUG_ON(s_blkno == t_blkno);
4802 
4803         trace_ocfs2_cp_xattr_bucket((unsigned long long)s_blkno,
4804                                     (unsigned long long)t_blkno,
4805                                     t_is_new);
4806 
4807         s_bucket = ocfs2_xattr_bucket_new(inode);
4808         t_bucket = ocfs2_xattr_bucket_new(inode);
4809         if (!s_bucket || !t_bucket) {
4810                 ret = -ENOMEM;
4811                 mlog_errno(ret);
4812                 goto out;
4813         }
4814 
4815         ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4816         if (ret)
4817                 goto out;
4818 
4819         /*
4820          * Even if !t_is_new, we're overwriting t_bucket.  Thus,
4821          * there's no need to read it.
4822          */
4823         ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno, t_is_new);
4824         if (ret)
4825                 goto out;
4826 
4827         /*
4828          * Hey, if we're overwriting t_bucket, what difference does
4829          * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
4830          * cluster to fill, we came here from
4831          * ocfs2_mv_xattr_buckets(), and it is really new -
4832          * ACCESS_CREATE is required.  But we also might have moved data
4833          * out of t_bucket before extending back into it.
4834          * ocfs2_add_new_xattr_bucket() can do this - its call to
4835          * ocfs2_add_new_xattr_cluster() may have created a new extent
4836          * and copied out the end of the old extent.  Then it re-extends
4837          * the old extent back to create space for new xattrs.  That's
4838          * how we get here, and the bucket isn't really new.
4839          */
4840         ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4841                                                 t_is_new ?
4842                                                 OCFS2_JOURNAL_ACCESS_CREATE :
4843                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4844         if (ret)
4845                 goto out;
4846 
4847         ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4848         ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4849 
4850 out:
4851         ocfs2_xattr_bucket_free(t_bucket);
4852         ocfs2_xattr_bucket_free(s_bucket);
4853 
4854         return ret;
4855 }
4856 
4857 /*
4858  * src_blk points to the start of an existing extent.  last_blk points to
4859  * last cluster in that extent.  to_blk points to a newly allocated
4860  * extent.  We copy the buckets from the cluster at last_blk to the new
4861  * extent.  If start_bucket is non-zero, we skip that many buckets before
4862  * we start copying.  The new extent's xh_num_buckets gets set to the
4863  * number of buckets we copied.  The old extent's xh_num_buckets shrinks
4864  * by the same amount.
4865  */
4866 static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4867                                   u64 src_blk, u64 last_blk, u64 to_blk,
4868                                   unsigned int start_bucket,
4869                                   u32 *first_hash)
4870 {
4871         int i, ret, credits;
4872         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4873         int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4874         int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4875         struct ocfs2_xattr_bucket *old_first, *new_first;
4876 
4877         trace_ocfs2_mv_xattr_buckets((unsigned long long)last_blk,
4878                                      (unsigned long long)to_blk);
4879 
4880         BUG_ON(start_bucket >= num_buckets);
4881         if (start_bucket) {
4882                 num_buckets -= start_bucket;
4883                 last_blk += (start_bucket * blks_per_bucket);
4884         }
4885 
4886         /* The first bucket of the original extent */
4887         old_first = ocfs2_xattr_bucket_new(inode);
4888         /* The first bucket of the new extent */
4889         new_first = ocfs2_xattr_bucket_new(inode);
4890         if (!old_first || !new_first) {
4891                 ret = -ENOMEM;
4892                 mlog_errno(ret);
4893                 goto out;
4894         }
4895 
4896         ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4897         if (ret) {
4898                 mlog_errno(ret);
4899                 goto out;
4900         }
4901 
4902         /*
4903          * We need to update the first bucket of the old extent and all
4904          * the buckets going to the new extent.
4905          */
4906         credits = ((num_buckets + 1) * blks_per_bucket);
4907         ret = ocfs2_extend_trans(handle, credits);
4908         if (ret) {
4909                 mlog_errno(ret);
4910                 goto out;
4911         }
4912 
4913         ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4914                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4915         if (ret) {
4916                 mlog_errno(ret);
4917                 goto out;
4918         }
4919 
4920         for (i = 0; i < num_buckets; i++) {
4921                 ret = ocfs2_cp_xattr_bucket(inode, handle,
4922                                             last_blk + (i * blks_per_bucket),
4923                                             to_blk + (i * blks_per_bucket),
4924                                             1);
4925                 if (ret) {
4926                         mlog_errno(ret);
4927                         goto out;
4928                 }
4929         }
4930 
4931         /*
4932          * Get the new bucket ready before we dirty anything
4933          * (This actually shouldn't fail, because we already dirtied
4934          * it once in ocfs2_cp_xattr_bucket()).
4935          */
4936         ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4937         if (ret) {
4938                 mlog_errno(ret);
4939                 goto out;
4940         }
4941         ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4942                                                 OCFS2_JOURNAL_ACCESS_WRITE);
4943         if (ret) {
4944                 mlog_errno(ret);
4945                 goto out;
4946         }
4947 
4948         /* Now update the headers */
4949         le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4950         ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4951 
4952         bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4953         ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4954 
4955         if (first_hash)
4956                 *first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4957 
4958 out:
4959         ocfs2_xattr_bucket_free(new_first);
4960         ocfs2_xattr_bucket_free(old_first);
4961         return ret;
4962 }
4963 
4964 /*
4965  * Move some xattrs in this cluster to the new cluster.
4966  * This function should only be called when bucket size == cluster size.
4967  * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4968  */
4969 static int ocfs2_divide_xattr_cluster(struct inode *inode,
4970                                       handle_t *handle,
4971                                       u64 prev_blk,
4972                                       u64 new_blk,
4973                                       u32 *first_hash)
4974 {
4975         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4976         int ret, credits = 2 * blk_per_bucket;
4977 
4978         BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4979 
4980         ret = ocfs2_extend_trans(handle, credits);
4981         if (ret) {
4982                 mlog_errno(ret);
4983                 return ret;
4984         }
4985 
4986         /* Move half of the xattr in start_blk to the next bucket. */
4987         return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4988                                           new_blk, first_hash, 1);
4989 }
4990 
4991 /*
4992  * Move some xattrs from the old cluster to the new one since they are not
4993  * contiguous in ocfs2 xattr tree.
4994  *
4995  * new_blk starts a new separate cluster, and we will move some xattrs from
4996  * prev_blk to it. v_start will be set as the first name hash value in this
4997  * new cluster so that it can be used as e_cpos during tree insertion and
4998  * don't collide with our original b-tree operations. first_bh and header_bh
4999  * will also be updated since they will be used in ocfs2_extend_xattr_bucket
5000  * to extend the insert bucket.
5001  *
5002  * The problem is how much xattr should we move to the new one and when should
5003  * we update first_bh and header_bh?
5004  * 1. If cluster size > bucket size, that means the previous cluster has more
5005  *    than 1 bucket, so just move half nums of bucket into the new cluster and
5006  *    update the first_bh and header_bh if the insert bucket has been moved
5007  *    to the new cluster.
5008  * 2. If cluster_size == bucket_size:
5009  *    a) If the previous extent rec has more than one cluster and the insert
5010  *       place isn't in the last cluster, copy the entire last cluster to the
5011  *       new one. This time, we don't need to upate the first_bh and header_bh
5012  *       since they will not be moved into the new cluster.
5013  *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
5014  *       the new one. And we set the extend flag to zero if the insert place is
5015  *       moved into the new allocated cluster since no extend is needed.
5016  */
5017 static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5018                                             handle_t *handle,
5019                                             struct ocfs2_xattr_bucket *first,
5020                                             struct ocfs2_xattr_bucket *target,
5021                                             u64 new_blk,
5022                                             u32 prev_clusters,
5023                                             u32 *v_start,
5024                                             int *extend)
5025 {
5026         int ret;
5027 
5028         trace_ocfs2_adjust_xattr_cross_cluster(
5029                         (unsigned long long)bucket_blkno(first),
5030                         (unsigned long long)new_blk, prev_clusters);
5031 
5032         if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5033                 ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5034                                                           handle,
5035                                                           first, target,
5036                                                           new_blk,
5037                                                           prev_clusters,
5038                                                           v_start);
5039                 if (ret)
5040                         mlog_errno(ret);
5041         } else {
5042                 /* The start of the last cluster in the first extent */
5043                 u64 last_blk = bucket_blkno(first) +
5044                         ((prev_clusters - 1) *
5045                          ocfs2_clusters_to_blocks(inode->i_sb, 1));
5046 
5047                 if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5048                         ret = ocfs2_mv_xattr_buckets(inode, handle,
5049                                                      bucket_blkno(first),
5050                                                      last_blk, new_blk, 0,
5051                                                      v_start);
5052                         if (ret)
5053                                 mlog_errno(ret);
5054                 } else {
5055                         ret = ocfs2_divide_xattr_cluster(inode, handle,
5056                                                          last_blk, new_blk,
5057                                                          v_start);
5058                         if (ret)
5059                                 mlog_errno(ret);
5060 
5061                         if ((bucket_blkno(target) == last_blk) && extend)
5062                                 *extend = 0;
5063                 }
5064         }
5065 
5066         return ret;
5067 }
5068 
5069 /*
5070  * Add a new cluster for xattr storage.
5071  *
5072  * If the new cluster is contiguous with the previous one, it will be
5073  * appended to the same extent record, and num_clusters will be updated.
5074  * If not, we will insert a new extent for it and move some xattrs in
5075  * the last cluster into the new allocated one.
5076  * We also need to limit the maximum size of a btree leaf, otherwise we'll
5077  * lose the benefits of hashing because we'll have to search large leaves.
5078  * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5079  * if it's bigger).
5080  *
5081  * first_bh is the first block of the previous extent rec and header_bh
5082  * indicates the bucket we will insert the new xattrs. They will be updated
5083  * when the header_bh is moved into the new cluster.
5084  */
5085 static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5086                                        struct buffer_head *root_bh,
5087                                        struct ocfs2_xattr_bucket *first,
5088                                        struct ocfs2_xattr_bucket *target,
5089                                        u32 *num_clusters,
5090                                        u32 prev_cpos,
5091                                        int *extend,
5092                                        struct ocfs2_xattr_set_ctxt *ctxt)
5093 {
5094         int ret;
5095         u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5096         u32 prev_clusters = *num_clusters;
5097         u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5098         u64 block;
5099         handle_t *handle = ctxt->handle;
5100         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5101         struct ocfs2_extent_tree et;
5102 
5103         trace_ocfs2_add_new_xattr_cluster_begin(
5104                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
5105                 (unsigned long long)bucket_blkno(first),
5106                 prev_cpos, prev_clusters);
5107 
5108         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5109 
5110         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5111                                       OCFS2_JOURNAL_ACCESS_WRITE);
5112         if (ret < 0) {
5113                 mlog_errno(ret);
5114                 goto leave;
5115         }
5116 
5117         ret = __ocfs2_claim_clusters(handle, ctxt->data_ac, 1,
5118                                      clusters_to_add, &bit_off, &num_bits);
5119         if (ret < 0) {
5120                 if (ret != -ENOSPC)
5121                         mlog_errno(ret);
5122                 goto leave;
5123         }
5124 
5125         BUG_ON(num_bits > clusters_to_add);
5126 
5127         block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5128         trace_ocfs2_add_new_xattr_cluster((unsigned long long)block, num_bits);
5129 
5130         if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5131             (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5132              OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5133                 /*
5134                  * If this cluster is contiguous with the old one and
5135                  * adding this new cluster, we don't surpass the limit of
5136                  * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5137                  * initialized and used like other buckets in the previous
5138                  * cluster.
5139                  * So add it as a contiguous one. The caller will handle
5140                  * its init process.
5141                  */
5142                 v_start = prev_cpos + prev_clusters;
5143                 *num_clusters = prev_clusters + num_bits;
5144         } else {
5145                 ret = ocfs2_adjust_xattr_cross_cluster(inode,
5146                                                        handle,
5147                                                        first,
5148                                                        target,
5149                                                        block,
5150                                                        prev_clusters,
5151                                                        &v_start,
5152                                                        extend);
5153                 if (ret) {
5154                         mlog_errno(ret);
5155                         goto leave;
5156                 }
5157         }
5158 
5159         trace_ocfs2_add_new_xattr_cluster_insert((unsigned long long)block,
5160                                                  v_start, num_bits);
5161         ret = ocfs2_insert_extent(handle, &et, v_start, block,
5162                                   num_bits, 0, ctxt->meta_ac);
5163         if (ret < 0) {
5164                 mlog_errno(ret);
5165                 goto leave;
5166         }
5167 
5168         ocfs2_journal_dirty(handle, root_bh);
5169 
5170 leave:
5171         return ret;
5172 }
5173 
5174 /*
5175  * We are given an extent.  'first' is the bucket at the very front of
5176  * the extent.  The extent has space for an additional bucket past
5177  * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
5178  * of the target bucket.  We wish to shift every bucket past the target
5179  * down one, filling in that additional space.  When we get back to the
5180  * target, we split the target between itself and the now-empty bucket
5181  * at target+1 (aka, target_blkno + blks_per_bucket).
5182  */
5183 static int ocfs2_extend_xattr_bucket(struct inode *inode,
5184                                      handle_t *handle,
5185                                      struct ocfs2_xattr_bucket *first,
5186                                      u64 target_blk,
5187                                      u32 num_clusters)
5188 {
5189         int ret, credits;
5190         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5191         u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5192         u64 end_blk;
5193         u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5194 
5195         trace_ocfs2_extend_xattr_bucket((unsigned long long)target_blk,
5196                                         (unsigned long long)bucket_blkno(first),
5197                                         num_clusters, new_bucket);
5198 
5199         /* The extent must have room for an additional bucket */
5200         BUG_ON(new_bucket >=
5201                (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5202 
5203         /* end_blk points to the last existing bucket */
5204         end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5205 
5206         /*
5207          * end_blk is the start of the last existing bucket.
5208          * Thus, (end_blk - target_blk) covers the target bucket and
5209          * every bucket after it up to, but not including, the last
5210          * existing bucket.  Then we add the last existing bucket, the
5211          * new bucket, and the first bucket (3 * blk_per_bucket).
5212          */
5213         credits = (end_blk - target_blk) + (3 * blk_per_bucket);
5214         ret = ocfs2_extend_trans(handle, credits);
5215         if (ret) {
5216                 mlog_errno(ret);
5217                 goto out;
5218         }
5219 
5220         ret = ocfs2_xattr_bucket_journal_access(handle, first,
5221                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5222         if (ret) {
5223                 mlog_errno(ret);
5224                 goto out;
5225         }
5226 
5227         while (end_blk != target_blk) {
5228                 ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5229                                             end_blk + blk_per_bucket, 0);
5230                 if (ret)
5231                         goto out;
5232                 end_blk -= blk_per_bucket;
5233         }
5234 
5235         /* Move half of the xattr in target_blkno to the next bucket. */
5236         ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5237                                         target_blk + blk_per_bucket, NULL, 0);
5238 
5239         le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5240         ocfs2_xattr_bucket_journal_dirty(handle, first);
5241 
5242 out:
5243         return ret;
5244 }
5245 
5246 /*
5247  * Add new xattr bucket in an extent record and adjust the buckets
5248  * accordingly.  xb_bh is the ocfs2_xattr_block, and target is the
5249  * bucket we want to insert into.
5250  *
5251  * In the easy case, we will move all the buckets after target down by
5252  * one. Half of target's xattrs will be moved to the next bucket.
5253  *
5254  * If current cluster is full, we'll allocate a new one.  This may not
5255  * be contiguous.  The underlying calls will make sure that there is
5256  * space for the insert, shifting buckets around if necessary.
5257  * 'target' may be moved by those calls.
5258  */
5259 static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5260                                       struct buffer_head *xb_bh,
5261                                       struct ocfs2_xattr_bucket *target,
5262                                       struct ocfs2_xattr_set_ctxt *ctxt)
5263 {
5264         struct ocfs2_xattr_block *xb =
5265                         (struct ocfs2_xattr_block *)xb_bh->b_data;
5266         struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5267         struct ocfs2_extent_list *el = &xb_root->xt_list;
5268         u32 name_hash =
5269                 le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5270         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5271         int ret, num_buckets, extend = 1;
5272         u64 p_blkno;
5273         u32 e_cpos, num_clusters;
5274         /* The bucket at the front of the extent */
5275         struct ocfs2_xattr_bucket *first;
5276 
5277         trace_ocfs2_add_new_xattr_bucket(
5278                                 (unsigned long long)bucket_blkno(target));
5279 
5280         /* The first bucket of the original extent */
5281         first = ocfs2_xattr_bucket_new(inode);
5282         if (!first) {
5283                 ret = -ENOMEM;
5284                 mlog_errno(ret);
5285                 goto out;
5286         }
5287 
5288         ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5289                                   &num_clusters, el);
5290         if (ret) {
5291                 mlog_errno(ret);
5292                 goto out;
5293         }
5294 
5295         ret = ocfs2_read_xattr_bucket(first, p_blkno);
5296         if (ret) {
5297                 mlog_errno(ret);
5298                 goto out;
5299         }
5300 
5301         num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5302         if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5303                 /*
5304                  * This can move first+target if the target bucket moves
5305                  * to the new extent.
5306                  */
5307                 ret = ocfs2_add_new_xattr_cluster(inode,
5308                                                   xb_bh,
5309                                                   first,
5310                                                   target,
5311                                                   &num_clusters,
5312                                                   e_cpos,
5313                                                   &extend,
5314                                                   ctxt);
5315                 if (ret) {
5316                         mlog_errno(ret);
5317                         goto out;
5318                 }
5319         }
5320 
5321         if (extend) {
5322                 ret = ocfs2_extend_xattr_bucket(inode,
5323                                                 ctxt->handle,
5324                                                 first,
5325                                                 bucket_blkno(target),
5326                                                 num_clusters);
5327                 if (ret)
5328                         mlog_errno(ret);
5329         }
5330 
5331 out:
5332         ocfs2_xattr_bucket_free(first);
5333 
5334         return ret;
5335 }
5336 
5337 /*
5338  * Truncate the specified xe_off entry in xattr bucket.
5339  * bucket is indicated by header_bh and len is the new length.
5340  * Both the ocfs2_xattr_value_root and the entry will be updated here.
5341  *
5342  * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5343  */
5344 static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5345                                              struct ocfs2_xattr_bucket *bucket,
5346                                              int xe_off,
5347                                              int len,
5348                                              struct ocfs2_xattr_set_ctxt *ctxt)
5349 {
5350         int ret, offset;
5351         u64 value_blk;
5352         struct ocfs2_xattr_entry *xe;
5353         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5354         size_t blocksize = inode->i_sb->s_blocksize;
5355         struct ocfs2_xattr_value_buf vb = {
5356                 .vb_access = ocfs2_journal_access,
5357         };
5358 
5359         xe = &xh->xh_entries[xe_off];
5360 
5361         BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5362 
5363         offset = le16_to_cpu(xe->xe_name_offset) +
5364                  OCFS2_XATTR_SIZE(xe->xe_name_len);
5365 
5366         value_blk = offset / blocksize;
5367 
5368         /* We don't allow ocfs2_xattr_value to be stored in different block. */
5369         BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5370 
5371         vb.vb_bh = bucket->bu_bhs[value_blk];
5372         BUG_ON(!vb.vb_bh);
5373 
5374         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5375                 (vb.vb_bh->b_data + offset % blocksize);
5376 
5377         /*
5378          * From here on out we have to dirty the bucket.  The generic
5379          * value calls only modify one of the bucket's bhs, but we need
5380          * to send the bucket at once.  So if they error, they *could* have
5381          * modified something.  We have to assume they did, and dirty
5382          * the whole bucket.  This leaves us in a consistent state.
5383          */
5384         trace_ocfs2_xattr_bucket_value_truncate(
5385                         (unsigned long long)bucket_blkno(bucket), xe_off, len);
5386         ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5387         if (ret) {
5388                 mlog_errno(ret);
5389                 goto out;
5390         }
5391 
5392         ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5393                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5394         if (ret) {
5395                 mlog_errno(ret);
5396                 goto out;
5397         }
5398 
5399         xe->xe_value_size = cpu_to_le64(len);
5400 
5401         ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5402 
5403 out:
5404         return ret;
5405 }
5406 
5407 static int ocfs2_rm_xattr_cluster(struct inode *inode,
5408                                   struct buffer_head *root_bh,
5409                                   u64 blkno,
5410                                   u32 cpos,
5411                                   u32 len,
5412                                   void *para)
5413 {
5414         int ret;
5415         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5416         struct inode *tl_inode = osb->osb_tl_inode;
5417         handle_t *handle;
5418         struct ocfs2_xattr_block *xb =
5419                         (struct ocfs2_xattr_block *)root_bh->b_data;
5420         struct ocfs2_alloc_context *meta_ac = NULL;
5421         struct ocfs2_cached_dealloc_ctxt dealloc;
5422         struct ocfs2_extent_tree et;
5423 
5424         ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5425                                           ocfs2_delete_xattr_in_bucket, para);
5426         if (ret) {
5427                 mlog_errno(ret);
5428                 return ret;
5429         }
5430 
5431         ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5432 
5433         ocfs2_init_dealloc_ctxt(&dealloc);
5434 
5435         trace_ocfs2_rm_xattr_cluster(
5436                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
5437                         (unsigned long long)blkno, cpos, len);
5438 
5439         ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5440                                                len);
5441 
5442         ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5443         if (ret) {
5444                 mlog_errno(ret);
5445                 return ret;
5446         }
5447 
5448         mutex_lock(&tl_inode->i_mutex);
5449 
5450         if (ocfs2_truncate_log_needs_flush(osb)) {
5451                 ret = __ocfs2_flush_truncate_log(osb);
5452                 if (ret < 0) {
5453                         mlog_errno(ret);
5454                         goto out;
5455                 }
5456         }
5457 
5458         handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5459         if (IS_ERR(handle)) {
5460                 ret = -ENOMEM;
5461                 mlog_errno(ret);
5462                 goto out;
5463         }
5464 
5465         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5466                                       OCFS2_JOURNAL_ACCESS_WRITE);
5467         if (ret) {
5468                 mlog_errno(ret);
5469                 goto out_commit;
5470         }
5471 
5472         ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5473                                   &dealloc);
5474         if (ret) {
5475                 mlog_errno(ret);
5476                 goto out_commit;
5477         }
5478 
5479         le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5480         ocfs2_journal_dirty(handle, root_bh);
5481 
5482         ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5483         if (ret)
5484                 mlog_errno(ret);
5485         ocfs2_update_inode_fsync_trans(handle, inode, 0);
5486 
5487 out_commit:
5488         ocfs2_commit_trans(osb, handle);
5489 out:
5490         ocfs2_schedule_truncate_log_flush(osb, 1);
5491 
5492         mutex_unlock(&tl_inode->i_mutex);
5493 
5494         if (meta_ac)
5495                 ocfs2_free_alloc_context(meta_ac);
5496 
5497         ocfs2_run_deallocs(osb, &dealloc);
5498 
5499         return ret;
5500 }
5501 
5502 /*
5503  * check whether the xattr bucket is filled up with the same hash value.
5504  * If we want to insert the xattr with the same hash, return -ENOSPC.
5505  * If we want to insert a xattr with different hash value, go ahead
5506  * and ocfs2_divide_xattr_bucket will handle this.
5507  */
5508 static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5509                                               struct ocfs2_xattr_bucket *bucket,
5510                                               const char *name)
5511 {
5512         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5513         u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5514 
5515         if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5516                 return 0;
5517 
5518         if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5519             xh->xh_entries[0].xe_name_hash) {
5520                 mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5521                      "hash = %u\n",
5522                      (unsigned long long)bucket_blkno(bucket),
5523                      le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5524                 return -ENOSPC;
5525         }
5526 
5527         return 0;
5528 }
5529 
5530 /*
5531  * Try to set the entry in the current bucket.  If we fail, the caller
5532  * will handle getting us another bucket.
5533  */
5534 static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5535                                         struct ocfs2_xattr_info *xi,
5536                                         struct ocfs2_xattr_search *xs,
5537                                         struct ocfs2_xattr_set_ctxt *ctxt)
5538 {
5539         int ret;
5540         struct ocfs2_xa_loc loc;
5541 
5542         trace_ocfs2_xattr_set_entry_bucket(xi->xi_name);
5543 
5544         ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5545                                        xs->not_found ? NULL : xs->here);
5546         ret = ocfs2_xa_set(&loc, xi, ctxt);
5547         if (!ret) {
5548                 xs->here = loc.xl_entry;
5549                 goto out;
5550         }
5551         if (ret != -ENOSPC) {
5552                 mlog_errno(ret);
5553                 goto out;
5554         }
5555 
5556         /* Ok, we need space.  Let's try defragmenting the bucket. */
5557         ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5558                                         xs->bucket);
5559         if (ret) {
5560                 mlog_errno(ret);
5561                 goto out;
5562         }
5563 
5564         ret = ocfs2_xa_set(&loc, xi, ctxt);
5565         if (!ret) {
5566                 xs->here = loc.xl_entry;
5567                 goto out;
5568         }
5569         if (ret != -ENOSPC)
5570                 mlog_errno(ret);
5571 
5572 
5573 out:
5574         return ret;
5575 }
5576 
5577 static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5578                                              struct ocfs2_xattr_info *xi,
5579                                              struct ocfs2_xattr_search *xs,
5580                                              struct ocfs2_xattr_set_ctxt *ctxt)
5581 {
5582         int ret;
5583 
5584         trace_ocfs2_xattr_set_entry_index_block(xi->xi_name);
5585 
5586         ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5587         if (!ret)
5588                 goto out;
5589         if (ret != -ENOSPC) {
5590                 mlog_errno(ret);
5591                 goto out;
5592         }
5593 
5594         /* Ack, need more space.  Let's try to get another bucket! */
5595 
5596         /*
5597          * We do not allow for overlapping ranges between buckets. And
5598          * the maximum number of collisions we will allow for then is
5599          * one bucket's worth, so check it here whether we need to
5600          * add a new bucket for the insert.
5601          */
5602         ret = ocfs2_check_xattr_bucket_collision(inode,
5603                                                  xs->bucket,
5604                                                  xi->xi_name);
5605         if (ret) {
5606                 mlog_errno(ret);
5607                 goto out;
5608         }
5609 
5610         ret = ocfs2_add_new_xattr_bucket(inode,
5611                                          xs->xattr_bh,
5612                                          xs->bucket,
5613                                          ctxt);
5614         if (ret) {
5615                 mlog_errno(ret);
5616                 goto out;
5617         }
5618 
5619         /*
5620          * ocfs2_add_new_xattr_bucket() will have updated
5621          * xs->bucket if it moved, but it will not have updated
5622          * any of the other search fields.  Thus, we drop it and
5623          * re-search.  Everything should be cached, so it'll be
5624          * quick.
5625          */
5626         ocfs2_xattr_bucket_relse(xs->bucket);
5627         ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5628                                            xi->xi_name_index,
5629                                            xi->xi_name, xs);
5630         if (ret && ret != -ENODATA)
5631                 goto out;
5632         xs->not_found = ret;
5633 
5634         /* Ok, we have a new bucket, let's try again */
5635         ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5636         if (ret && (ret != -ENOSPC))
5637                 mlog_errno(ret);
5638 
5639 out:
5640         return ret;
5641 }
5642 
5643 static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5644                                         struct ocfs2_xattr_bucket *bucket,
5645                                         void *para)
5646 {
5647         int ret = 0, ref_credits;
5648         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5649         u16 i;
5650         struct ocfs2_xattr_entry *xe;
5651         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5652         struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5653         int credits = ocfs2_remove_extent_credits(osb->sb) +
5654                 ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5655         struct ocfs2_xattr_value_root *xv;
5656         struct ocfs2_rm_xattr_bucket_para *args =
5657                         (struct ocfs2_rm_xattr_bucket_para *)para;
5658 
5659         ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5660 
5661         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5662                 xe = &xh->xh_entries[i];
5663                 if (ocfs2_xattr_is_local(xe))
5664                         continue;
5665 
5666                 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5667                                                       i, &xv, NULL);
5668 
5669                 ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5670                                                          args->ref_ci,
5671                                                          args->ref_root_bh,
5672                                                          &ctxt.meta_ac,
5673                                                          &ref_credits);
5674 
5675                 ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5676                 if (IS_ERR(ctxt.handle)) {
5677                         ret = PTR_ERR(ctxt.handle);
5678                         mlog_errno(ret);
5679                         break;
5680                 }
5681 
5682                 ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5683                                                         i, 0, &ctxt);
5684 
5685                 ocfs2_commit_trans(osb, ctxt.handle);
5686                 if (ctxt.meta_ac) {
5687                         ocfs2_free_alloc_context(ctxt.meta_ac);
5688                         ctxt.meta_ac = NULL;
5689                 }
5690                 if (ret) {
5691                         mlog_errno(ret);
5692                         break;
5693                 }
5694         }
5695 
5696         if (ctxt.meta_ac)
5697                 ocfs2_free_alloc_context(ctxt.meta_ac);
5698         ocfs2_schedule_truncate_log_flush(osb, 1);
5699         ocfs2_run_deallocs(osb, &ctxt.dealloc);
5700         return ret;
5701 }
5702 
5703 /*
5704  * Whenever we modify a xattr value root in the bucket(e.g, CoW
5705  * or change the extent record flag), we need to recalculate
5706  * the metaecc for the whole bucket. So it is done here.
5707  *
5708  * Note:
5709  * We have to give the extra credits for the caller.
5710  */
5711 static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5712                                             handle_t *handle,
5713                                             void *para)
5714 {
5715         int ret;
5716         struct ocfs2_xattr_bucket *bucket =
5717                         (struct ocfs2_xattr_bucket *)para;
5718 
5719         ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5720                                                 OCFS2_JOURNAL_ACCESS_WRITE);
5721         if (ret) {
5722                 mlog_errno(ret);
5723                 return ret;
5724         }
5725 
5726         ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5727 
5728         return 0;
5729 }
5730 
5731 /*
5732  * Special action we need if the xattr value is refcounted.
5733  *
5734  * 1. If the xattr is refcounted, lock the tree.
5735  * 2. CoW the xattr if we are setting the new value and the value
5736  *    will be stored outside.
5737  * 3. In other case, decrease_refcount will work for us, so just
5738  *    lock the refcount tree, calculate the meta and credits is OK.
5739  *
5740  * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5741  * currently CoW is a completed transaction, while this function
5742  * will also lock the allocators and let us deadlock. So we will
5743  * CoW the whole xattr value.
5744  */
5745 static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5746                                         struct ocfs2_dinode *di,
5747                                         struct ocfs2_xattr_info *xi,
5748                                         struct ocfs2_xattr_search *xis,
5749                                         struct ocfs2_xattr_search *xbs,
5750                                         struct ocfs2_refcount_tree **ref_tree,
5751                                         int *meta_add,
5752                                         int *credits)
5753 {
5754         int ret = 0;
5755         struct ocfs2_xattr_block *xb;
5756         struct ocfs2_xattr_entry *xe;
5757         char *base;
5758         u32 p_cluster, num_clusters;
5759         unsigned int ext_flags;
5760         int name_offset, name_len;
5761         struct ocfs2_xattr_value_buf vb;
5762         struct ocfs2_xattr_bucket *bucket = NULL;
5763         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5764         struct ocfs2_post_refcount refcount;
5765         struct ocfs2_post_refcount *p = NULL;
5766         struct buffer_head *ref_root_bh = NULL;
5767 
5768         if (!xis->not_found) {
5769                 xe = xis->here;
5770                 name_offset = le16_to_cpu(xe->xe_name_offset);
5771                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5772                 base = xis->base;
5773                 vb.vb_bh = xis->inode_bh;
5774                 vb.vb_access = ocfs2_journal_access_di;
5775         } else {
5776                 int i, block_off = 0;
5777                 xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5778                 xe = xbs->here;
5779                 name_offset = le16_to_cpu(xe->xe_name_offset);
5780                 name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5781                 i = xbs->here - xbs->header->xh_entries;
5782 
5783                 if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5784                         ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5785                                                         bucket_xh(xbs->bucket),
5786                                                         i, &block_off,
5787                                                         &name_offset);
5788                         if (ret) {
5789                                 mlog_errno(ret);
5790                                 goto out;
5791                         }
5792                         base = bucket_block(xbs->bucket, block_off);
5793                         vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5794                         vb.vb_access = ocfs2_journal_access;
5795 
5796                         if (ocfs2_meta_ecc(osb)) {
5797                                 /*create parameters for ocfs2_post_refcount. */
5798                                 bucket = xbs->bucket;
5799                                 refcount.credits = bucket->bu_blocks;
5800                                 refcount.para = bucket;
5801                                 refcount.func =
5802                                         ocfs2_xattr_bucket_post_refcount;
5803                                 p = &refcount;
5804                         }
5805                 } else {
5806                         base = xbs->base;
5807                         vb.vb_bh = xbs->xattr_bh;
5808                         vb.vb_access = ocfs2_journal_access_xb;
5809                 }
5810         }
5811 
5812         if (ocfs2_xattr_is_local(xe))
5813                 goto out;
5814 
5815         vb.vb_xv = (struct ocfs2_xattr_value_root *)
5816                                 (base + name_offset + name_len);
5817 
5818         ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5819                                        &num_clusters, &vb.vb_xv->xr_list,
5820                                        &ext_flags);
5821         if (ret) {
5822                 mlog_errno(ret);
5823                 goto out;
5824         }
5825 
5826         /*
5827          * We just need to check the 1st extent record, since we always
5828          * CoW the whole xattr. So there shouldn't be a xattr with
5829          * some REFCOUNT extent recs after the 1st one.
5830          */
5831         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5832                 goto out;
5833 
5834         ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5835                                        1, ref_tree, &ref_root_bh);
5836         if (ret) {
5837                 mlog_errno(ret);
5838                 goto out;
5839         }
5840 
5841         /*
5842          * If we are deleting the xattr or the new size will be stored inside,
5843          * cool, leave it there, the xattr truncate process will remove them
5844          * for us(it still needs the refcount tree lock and the meta, credits).
5845          * And the worse case is that every cluster truncate will split the
5846          * refcount tree, and make the original extent become 3. So we will need
5847          * 2 * cluster more extent recs at most.
5848          */
5849         if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5850 
5851                 ret = ocfs2_refcounted_xattr_delete_need(inode,
5852                                                          &(*ref_tree)->rf_ci,
5853                                                          ref_root_bh, vb.vb_xv,
5854                                                          meta_add, credits);
5855                 if (ret)
5856                         mlog_errno(ret);
5857                 goto out;
5858         }
5859 
5860         ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5861                                        *ref_tree, ref_root_bh, 0,
5862                                        le32_to_cpu(vb.vb_xv->xr_clusters), p);
5863         if (ret)
5864                 mlog_errno(ret);
5865 
5866 out:
5867         brelse(ref_root_bh);
5868         return ret;
5869 }
5870 
5871 /*
5872  * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5873  * The physical clusters will be added to refcount tree.
5874  */
5875 static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5876                                 struct ocfs2_xattr_value_root *xv,
5877                                 struct ocfs2_extent_tree *value_et,
5878                                 struct ocfs2_caching_info *ref_ci,
5879                                 struct buffer_head *ref_root_bh,
5880                                 struct ocfs2_cached_dealloc_ctxt *dealloc,
5881                                 struct ocfs2_post_refcount *refcount)
5882 {
5883         int ret = 0;
5884         u32 clusters = le32_to_cpu(xv->xr_clusters);
5885         u32 cpos, p_cluster, num_clusters;
5886         struct ocfs2_extent_list *el = &xv->xr_list;
5887         unsigned int ext_flags;
5888 
5889         cpos = 0;
5890         while (cpos < clusters) {
5891                 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5892                                                &num_clusters, el, &ext_flags);
5893                 if (ret) {
5894                         mlog_errno(ret);
5895                         break;
5896                 }
5897 
5898                 cpos += num_clusters;
5899                 if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5900                         continue;
5901 
5902                 BUG_ON(!p_cluster);
5903 
5904                 ret = ocfs2_add_refcount_flag(inode, value_et,
5905                                               ref_ci, ref_root_bh,
5906                                               cpos - num_clusters,
5907                                               p_cluster, num_clusters,
5908                                               dealloc, refcount);
5909                 if (ret) {
5910                         mlog_errno(ret);
5911                         break;
5912                 }
5913         }
5914 
5915         return ret;
5916 }
5917 
5918 /*
5919  * Given a normal ocfs2_xattr_header, refcount all the entries which
5920  * have value stored outside.
5921  * Used for xattrs stored in inode and ocfs2_xattr_block.
5922  */
5923 static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5924                                 struct ocfs2_xattr_value_buf *vb,
5925                                 struct ocfs2_xattr_header *header,
5926                                 struct ocfs2_caching_info *ref_ci,
5927                                 struct buffer_head *ref_root_bh,
5928                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
5929 {
5930 
5931         struct ocfs2_xattr_entry *xe;
5932         struct ocfs2_xattr_value_root *xv;
5933         struct ocfs2_extent_tree et;
5934         int i, ret = 0;
5935 
5936         for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5937                 xe = &header->xh_entries[i];
5938 
5939                 if (ocfs2_xattr_is_local(xe))
5940                         continue;
5941 
5942                 xv = (struct ocfs2_xattr_value_root *)((void *)header +
5943                         le16_to_cpu(xe->xe_name_offset) +
5944                         OCFS2_XATTR_SIZE(xe->xe_name_len));
5945 
5946                 vb->vb_xv = xv;
5947                 ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5948 
5949                 ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5950                                                         ref_ci, ref_root_bh,
5951                                                         dealloc, NULL);
5952                 if (ret) {
5953                         mlog_errno(ret);
5954                         break;
5955                 }
5956         }
5957 
5958         return ret;
5959 }
5960 
5961 static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5962                                 struct buffer_head *fe_bh,
5963                                 struct ocfs2_caching_info *ref_ci,
5964                                 struct buffer_head *ref_root_bh,
5965                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
5966 {
5967         struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5968         struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5969                                 (fe_bh->b_data + inode->i_sb->s_blocksize -
5970                                 le16_to_cpu(di->i_xattr_inline_size));
5971         struct ocfs2_xattr_value_buf vb = {
5972                 .vb_bh = fe_bh,
5973                 .vb_access = ocfs2_journal_access_di,
5974         };
5975 
5976         return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5977                                                   ref_ci, ref_root_bh, dealloc);
5978 }
5979 
5980 struct ocfs2_xattr_tree_value_refcount_para {
5981         struct ocfs2_caching_info *ref_ci;
5982         struct buffer_head *ref_root_bh;
5983         struct ocfs2_cached_dealloc_ctxt *dealloc;
5984 };
5985 
5986 static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5987                                            struct ocfs2_xattr_bucket *bucket,
5988                                            int offset,
5989                                            struct ocfs2_xattr_value_root **xv,
5990                                            struct buffer_head **bh)
5991 {
5992         int ret, block_off, name_offset;
5993         struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5994         struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5995         void *base;
5996 
5997         ret = ocfs2_xattr_bucket_get_name_value(sb,
5998                                                 bucket_xh(bucket),
5999                                                 offset,
6000                                                 &block_off,
6001                                                 &name_offset);
6002         if (ret) {
6003                 mlog_errno(ret);
6004                 goto out;
6005         }
6006 
6007         base = bucket_block(bucket, block_off);
6008 
6009         *xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6010                          OCFS2_XATTR_SIZE(xe->xe_name_len));
6011 
6012         if (bh)
6013                 *bh = bucket->bu_bhs[block_off];
6014 out:
6015         return ret;
6016 }
6017 
6018 /*
6019  * For a given xattr bucket, refcount all the entries which
6020  * have value stored outside.
6021  */
6022 static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6023                                              struct ocfs2_xattr_bucket *bucket,
6024                                              void *para)
6025 {
6026         int i, ret = 0;
6027         struct ocfs2_extent_tree et;
6028         struct ocfs2_xattr_tree_value_refcount_para *ref =
6029                         (struct ocfs2_xattr_tree_value_refcount_para *)para;
6030         struct ocfs2_xattr_header *xh =
6031                         (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6032         struct ocfs2_xattr_entry *xe;
6033         struct ocfs2_xattr_value_buf vb = {
6034                 .vb_access = ocfs2_journal_access,
6035         };
6036         struct ocfs2_post_refcount refcount = {
6037                 .credits = bucket->bu_blocks,
6038                 .para = bucket,
6039                 .func = ocfs2_xattr_bucket_post_refcount,
6040         };
6041         struct ocfs2_post_refcount *p = NULL;
6042 
6043         /* We only need post_refcount if we support metaecc. */
6044         if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6045                 p = &refcount;
6046 
6047         trace_ocfs2_xattr_bucket_value_refcount(
6048                                 (unsigned long long)bucket_blkno(bucket),
6049                                 le16_to_cpu(xh->xh_count));
6050         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6051                 xe = &xh->xh_entries[i];
6052 
6053                 if (ocfs2_xattr_is_local(xe))
6054                         continue;
6055 
6056                 ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6057                                                       &vb.vb_xv, &vb.vb_bh);
6058                 if (ret) {
6059                         mlog_errno(ret);
6060                         break;
6061                 }
6062 
6063                 ocfs2_init_xattr_value_extent_tree(&et,
6064                                                    INODE_CACHE(inode), &vb);
6065 
6066                 ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6067                                                         &et, ref->ref_ci,
6068                                                         ref->ref_root_bh,
6069                                                         ref->dealloc, p);
6070                 if (ret) {
6071                         mlog_errno(ret);
6072                         break;
6073                 }
6074         }
6075 
6076         return ret;
6077 
6078 }
6079 
6080 static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6081                                      struct buffer_head *root_bh,
6082                                      u64 blkno, u32 cpos, u32 len, void *para)
6083 {
6084         return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6085                                            ocfs2_xattr_bucket_value_refcount,
6086                                            para);
6087 }
6088 
6089 static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6090                                 struct buffer_head *blk_bh,
6091                                 struct ocfs2_caching_info *ref_ci,
6092                                 struct buffer_head *ref_root_bh,
6093                                 struct ocfs2_cached_dealloc_ctxt *dealloc)
6094 {
6095         int ret = 0;
6096         struct ocfs2_xattr_block *xb =
6097                                 (struct ocfs2_xattr_block *)blk_bh->b_data;
6098 
6099         if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6100                 struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6101                 struct ocfs2_xattr_value_buf vb = {
6102                         .vb_bh = blk_bh,
6103                         .vb_access = ocfs2_journal_access_xb,
6104                 };
6105 
6106                 ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6107                                                          ref_ci, ref_root_bh,
6108                                                          dealloc);
6109         } else {
6110                 struct ocfs2_xattr_tree_value_refcount_para para = {
6111                         .ref_ci = ref_ci,
6112                         .ref_root_bh = ref_root_bh,
6113                         .dealloc = dealloc,
6114                 };
6115 
6116                 ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6117                                                 ocfs2_refcount_xattr_tree_rec,
6118                                                 &para);
6119         }
6120 
6121         return ret;
6122 }
6123 
6124 int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6125                                      struct buffer_head *fe_bh,
6126                                      struct ocfs2_caching_info *ref_ci,
6127                                      struct buffer_head *ref_root_bh,
6128                                      struct ocfs2_cached_dealloc_ctxt *dealloc)
6129 {
6130         int ret = 0;
6131         struct ocfs2_inode_info *oi = OCFS2_I(inode);
6132         struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6133         struct buffer_head *blk_bh = NULL;
6134 
6135         if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6136                 ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6137                                                          ref_ci, ref_root_bh,
6138                                                          dealloc);
6139                 if (ret) {
6140                         mlog_errno(ret);
6141                         goto out;
6142                 }
6143         }
6144 
6145         if (!di->i_xattr_loc)
6146                 goto out;
6147 
6148         ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6149                                      &blk_bh);
6150         if (ret < 0) {
6151                 mlog_errno(ret);
6152                 goto out;
6153         }
6154 
6155         ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6156                                                 ref_root_bh, dealloc);
6157         if (ret)
6158                 mlog_errno(ret);
6159 
6160         brelse(blk_bh);
6161 out:
6162 
6163         return ret;
6164 }
6165 
6166 typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6167 /*
6168  * Store the information we need in xattr reflink.
6169  * old_bh and new_bh are inode bh for the old and new inode.
6170  */
6171 struct ocfs2_xattr_reflink {
6172         struct inode *old_inode;
6173         struct inode *new_inode;
6174         struct buffer_head *old_bh;
6175         struct buffer_head *new_bh;
6176         struct ocfs2_caching_info *ref_ci;
6177         struct buffer_head *ref_root_bh;
6178         struct ocfs2_cached_dealloc_ctxt *dealloc;
6179         should_xattr_reflinked *xattr_reflinked;
6180 };
6181 
6182 /*
6183  * Given a xattr header and xe offset,
6184  * return the proper xv and the corresponding bh.
6185  * xattr in inode, block and xattr tree have different implementaions.
6186  */
6187 typedef int (get_xattr_value_root)(struct super_block *sb,
6188                                    struct buffer_head *bh,
6189                                    struct ocfs2_xattr_header *xh,
6190                                    int offset,
6191                                    struct ocfs2_xattr_value_root **xv,
6192                                    struct buffer_head **ret_bh,
6193                                    void *para);
6194 
6195 /*
6196  * Calculate all the xattr value root metadata stored in this xattr header and
6197  * credits we need if we create them from the scratch.
6198  * We use get_xattr_value_root so that all types of xattr container can use it.
6199  */
6200 static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6201                                              struct buffer_head *bh,
6202                                              struct ocfs2_xattr_header *xh,
6203                                              int *metas, int *credits,
6204                                              int *num_recs,
6205                                              get_xattr_value_root *func,
6206                                              void *para)
6207 {
6208         int i, ret = 0;
6209         struct ocfs2_xattr_value_root *xv;
6210         struct ocfs2_xattr_entry *xe;
6211 
6212         for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6213                 xe = &xh->xh_entries[i];
6214                 if (ocfs2_xattr_is_local(xe))
6215                         continue;
6216 
6217                 ret = func(sb, bh, xh, i, &xv, NULL, para);
6218                 if (ret) {
6219                         mlog_errno(ret);
6220                         break;
6221                 }
6222 
6223                 *metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6224                           le16_to_cpu(xv->xr_list.l_next_free_rec);
6225 
6226                 *credits += ocfs2_calc_extend_credits(sb,
6227                                                 &def_xv.xv.xr_list);
6228 
6229                 /*
6230                  * If the value is a tree with depth > 1, We don't go deep
6231                  * to the extent block, so just calculate a maximum record num.
6232                  */
6233                 if (!xv->xr_list.l_tree_depth)
6234                         *num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6235                 else
6236                         *num_recs += ocfs2_clusters_for_bytes(sb,
6237                                                               XATTR_SIZE_MAX);
6238         }
6239 
6240         return ret;
6241 }
6242 
6243 /* Used by xattr inode and block to return the right xv and buffer_head. */
6244 static int ocfs2_get_xattr_value_root(struct super_block *sb,
6245                                       struct buffer_head *bh,
6246                                       struct ocfs2_xattr_header *xh,
6247                                       int offset,
6248                                       struct ocfs2_xattr_value_root **xv,
6249                                       struct buffer_head **ret_bh,
6250                                       void *para)
6251 {
6252         struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6253 
6254         *xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6255                 le16_to_cpu(xe->xe_name_offset) +
6256                 OCFS2_XATTR_SIZE(xe->xe_name_len));
6257 
6258         if (ret_bh)
6259                 *ret_bh = bh;
6260 
6261         return 0;
6262 }
6263 
6264 /*
6265  * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6266  * It is only used for inline xattr and xattr block.
6267  */
6268 static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6269                                         struct ocfs2_xattr_header *xh,
6270                                         struct buffer_head *ref_root_bh,
6271                                         int *credits,
6272                                         struct ocfs2_alloc_context **meta_ac)
6273 {
6274         int ret, meta_add = 0, num_recs = 0;
6275         struct ocfs2_refcount_block *rb =
6276                         (struct ocfs2_refcount_block *)ref_root_bh->b_data;
6277 
6278         *credits = 0;
6279 
6280         ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6281                                                 &meta_add, credits, &num_recs,
6282                                                 ocfs2_get_xattr_value_root,
6283                                                 NULL);
6284         if (ret) {
6285                 mlog_errno(ret);
6286                 goto out;
6287         }
6288 
6289         /*
6290          * We need to add/modify num_recs in refcount tree, so just calculate
6291          * an approximate number we need for refcount tree change.
6292          * Sometimes we need to split the tree, and after split,  half recs
6293          * will be moved to the new block, and a new block can only provide
6294          * half number of recs. So we multiple new blocks by 2.
6295          */
6296         num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6297         meta_add += num_recs;
6298         *credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6299         if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6300                 *credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6301                             le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6302         else
6303                 *credits += 1;
6304 
6305         ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6306         if (ret)
6307                 mlog_errno(ret);
6308 
6309 out:
6310         return ret;
6311 }
6312 
6313 /*
6314  * Given a xattr header, reflink all the xattrs in this container.
6315  * It can be used for inode, block and bucket.
6316  *
6317  * NOTE:
6318  * Before we call this function, the caller has memcpy the xattr in
6319  * old_xh to the new_xh.
6320  *
6321  * If args.xattr_reflinked is set, call it to decide whether the xe should
6322  * be reflinked or not. If not, remove it from the new xattr header.
6323  */
6324 static int ocfs2_reflink_xattr_header(handle_t *handle,
6325                                       struct ocfs2_xattr_reflink *args,
6326                                       struct buffer_head *old_bh,
6327                                       struct ocfs2_xattr_header *xh,
6328                                       struct buffer_head *new_bh,
6329                                       struct ocfs2_xattr_header *new_xh,
6330                                       struct ocfs2_xattr_value_buf *vb,
6331                                       struct ocfs2_alloc_context *meta_ac,
6332                                       get_xattr_value_root *func,
6333                                       void *para)
6334 {
6335         int ret = 0, i, j;
6336         struct super_block *sb = args->old_inode->i_sb;
6337         struct buffer_head *value_bh;
6338         struct ocfs2_xattr_entry *xe, *last;
6339         struct ocfs2_xattr_value_root *xv, *new_xv;
6340         struct ocfs2_extent_tree data_et;
6341         u32 clusters, cpos, p_cluster, num_clusters;
6342         unsigned int ext_flags = 0;
6343 
6344         trace_ocfs2_reflink_xattr_header((unsigned long long)old_bh->b_blocknr,
6345                                          le16_to_cpu(xh->xh_count));
6346 
6347         last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6348         for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6349                 xe = &xh->xh_entries[i];
6350 
6351                 if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6352                         xe = &new_xh->xh_entries[j];
6353 
6354                         le16_add_cpu(&new_xh->xh_count, -1);
6355                         if (new_xh->xh_count) {
6356                                 memmove(xe, xe + 1,
6357                                         (void *)last - (void *)xe);
6358                                 memset(last, 0,
6359                                        sizeof(struct ocfs2_xattr_entry));
6360                         }
6361 
6362                         /*
6363                          * We don't want j to increase in the next round since
6364                          * it is already moved ahead.
6365                          */
6366                         j--;
6367                         continue;
6368                 }
6369 
6370                 if (ocfs2_xattr_is_local(xe))
6371                         continue;
6372 
6373                 ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6374                 if (ret) {
6375                         mlog_errno(ret);
6376                         break;
6377                 }
6378 
6379                 ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6380                 if (ret) {
6381                         mlog_errno(ret);
6382                         break;
6383                 }
6384 
6385                 /*
6386                  * For the xattr which has l_tree_depth = 0, all the extent
6387                  * recs have already be copied to the new xh with the
6388                  * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6389                  * increase the refount count int the refcount tree.
6390                  *
6391                  * For the xattr which has l_tree_depth > 0, we need
6392                  * to initialize it to the empty default value root,
6393                  * and then insert the extents one by one.
6394                  */
6395                 if (xv->xr_list.l_tree_depth) {
6396                         memcpy(new_xv, &def_xv, sizeof(def_xv));
6397                         vb->vb_xv = new_xv;
6398                         vb->vb_bh = value_bh;
6399                         ocfs2_init_xattr_value_extent_tree(&data_et,
6400                                         INODE_CACHE(args->new_inode), vb);
6401                 }
6402 
6403                 clusters = le32_to_cpu(xv->xr_clusters);
6404                 cpos = 0;
6405                 while (cpos < clusters) {
6406                         ret = ocfs2_xattr_get_clusters(args->old_inode,
6407                                                        cpos,
6408                                                        &p_cluster,
6409                                                        &num_clusters,
6410                                                        &xv->xr_list,
6411                                                        &ext_flags);
6412                         if (ret) {
6413                                 mlog_errno(ret);
6414                                 goto out;
6415                         }
6416 
6417                         BUG_ON(!p_cluster);
6418 
6419                         if (xv->xr_list.l_tree_depth) {
6420                                 ret = ocfs2_insert_extent(handle,
6421                                                 &data_et, cpos,
6422                                                 ocfs2_clusters_to_blocks(
6423                                                         args->old_inode->i_sb,
6424                                                         p_cluster),
6425                                                 num_clusters, ext_flags,
6426                                                 meta_ac);
6427                                 if (ret) {
6428                                         mlog_errno(ret);
6429                                         goto out;
6430                                 }
6431                         }
6432 
6433                         ret = ocfs2_increase_refcount(handle, args->ref_ci,
6434                                                       args->ref_root_bh,
6435                                                       p_cluster, num_clusters,
6436                                                       meta_ac, args->dealloc);
6437                         if (ret) {
6438                                 mlog_errno(ret);
6439                                 goto out;
6440                         }
6441 
6442                         cpos += num_clusters;
6443                 }
6444         }
6445 
6446 out:
6447         return ret;
6448 }
6449 
6450 static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6451 {
6452         int ret = 0, credits = 0;
6453         handle_t *handle;
6454         struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6455         struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6456         int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6457         int header_off = osb->sb->s_blocksize - inline_size;
6458         struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6459                                         (args->old_bh->b_data + header_off);
6460         struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6461                                         (args->new_bh->b_data + header_off);
6462         struct ocfs2_alloc_context *meta_ac = NULL;
6463         struct ocfs2_inode_info *new_oi;
6464         struct ocfs2_dinode *new_di;
6465         struct ocfs2_xattr_value_buf vb = {
6466                 .vb_bh = args->new_bh,
6467                 .vb_access = ocfs2_journal_access_di,
6468         };
6469 
6470         ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6471                                                   &credits, &meta_ac);
6472         if (ret) {
6473                 mlog_errno(ret);
6474                 goto out;
6475         }
6476 
6477         handle = ocfs2_start_trans(osb, credits);
6478         if (IS_ERR(handle)) {
6479                 ret = PTR_ERR(handle);
6480                 mlog_errno(ret);
6481                 goto out;
6482         }
6483 
6484         ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6485                                       args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6486         if (ret) {
6487                 mlog_errno(ret);
6488                 goto out_commit;
6489         }
6490 
6491         memcpy(args->new_bh->b_data + header_off,
6492                args->old_bh->b_data + header_off, inline_size);
6493 
6494         new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6495         new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6496 
6497         ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6498                                          args->new_bh, new_xh, &vb, meta_ac,
6499                                          ocfs2_get_xattr_value_root, NULL);
6500         if (ret) {
6501                 mlog_errno(ret);
6502                 goto out_commit;
6503         }
6504 
6505         new_oi = OCFS2_I(args->new_inode);
6506         /*
6507          * Adjust extent record count to reserve space for extended attribute.
6508          * Inline data count had been adjusted in ocfs2_duplicate_inline_data().
6509          */
6510         if (!(new_oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) &&
6511             !(ocfs2_inode_is_fast_symlink(args->new_inode))) {
6512                 struct ocfs2_extent_list *el = &new_di->id2.i_list;
6513                 le16_add_cpu(&el->l_count, -(inline_size /
6514                                         sizeof(struct ocfs2_extent_rec)));
6515         }
6516         spin_lock(&new_oi->ip_lock);
6517         new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6518         new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6519         spin_unlock(&new_oi->ip_lock);
6520 
6521         ocfs2_journal_dirty(handle, args->new_bh);
6522 
6523 out_commit:
6524         ocfs2_commit_trans(osb, handle);
6525 
6526 out:
6527         if (meta_ac)
6528                 ocfs2_free_alloc_context(meta_ac);
6529         return ret;
6530 }
6531 
6532 static int ocfs2_create_empty_xattr_block(struct inode *inode,
6533                                           struct buffer_head *fe_bh,
6534                                           struct buffer_head **ret_bh,
6535                                           int indexed)
6536 {
6537         int ret;
6538         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6539         struct ocfs2_xattr_set_ctxt ctxt;
6540 
6541         memset(&ctxt, 0, sizeof(ctxt));
6542         ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &ctxt.meta_ac);
6543         if (ret < 0) {
6544                 mlog_errno(ret);
6545                 return ret;
6546         }
6547 
6548         ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6549         if (IS_ERR(ctxt.handle)) {
6550                 ret = PTR_ERR(ctxt.handle);
6551                 mlog_errno(ret);
6552                 goto out;
6553         }
6554 
6555         trace_ocfs2_create_empty_xattr_block(
6556                                 (unsigned long long)fe_bh->b_blocknr, indexed);
6557         ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6558                                        ret_bh);
6559         if (ret)
6560                 mlog_errno(ret);
6561 
6562         ocfs2_commit_trans(osb, ctxt.handle);
6563 out:
6564         ocfs2_free_alloc_context(ctxt.meta_ac);
6565         return ret;
6566 }
6567 
6568 static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6569                                      struct buffer_head *blk_bh,
6570                                      struct buffer_head *new_blk_bh)
6571 {
6572         int ret = 0, credits = 0;
6573         handle_t *handle;
6574         struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6575         struct ocfs2_dinode *new_di;
6576         struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6577         int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6578         struct ocfs2_xattr_block *xb =
6579                         (struct ocfs2_xattr_block *)blk_bh->b_data;
6580         struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6581         struct ocfs2_xattr_block *new_xb =
6582                         (struct ocfs2_xattr_block *)new_blk_bh->b_data;
6583         struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6584         struct ocfs2_alloc_context *meta_ac;
6585         struct ocfs2_xattr_value_buf vb = {
6586                 .vb_bh = new_blk_bh,
6587                 .vb_access = ocfs2_journal_access_xb,
6588         };
6589 
6590         ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6591                                                   &credits, &meta_ac);
6592         if (ret) {
6593                 mlog_errno(ret);
6594                 return ret;
6595         }
6596 
6597         /* One more credits in case we need to add xattr flags in new inode. */
6598         handle = ocfs2_start_trans(osb, credits + 1);
6599         if (IS_ERR(handle)) {
6600                 ret = PTR_ERR(handle);
6601                 mlog_errno(ret);
6602                 goto out;
6603         }
6604 
6605         if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6606                 ret = ocfs2_journal_access_di(handle,
6607                                               INODE_CACHE(args->new_inode),
6608                                               args->new_bh,
6609                                               OCFS2_JOURNAL_ACCESS_WRITE);
6610                 if (ret) {
6611                         mlog_errno(ret);
6612                         goto out_commit;
6613                 }
6614         }
6615 
6616         ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6617                                       new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6618         if (ret) {
6619                 mlog_errno(ret);
6620                 goto out_commit;
6621         }
6622 
6623         memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6624                osb->sb->s_blocksize - header_off);
6625 
6626         ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6627                                          new_blk_bh, new_xh, &vb, meta_ac,
6628                                          ocfs2_get_xattr_value_root, NULL);
6629         if (ret) {
6630                 mlog_errno(ret);
6631                 goto out_commit;
6632         }
6633 
6634         ocfs2_journal_dirty(handle, new_blk_bh);
6635 
6636         if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6637                 new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6638                 spin_lock(&new_oi->ip_lock);
6639                 new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6640                 new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6641                 spin_unlock(&new_oi->ip_lock);
6642 
6643                 ocfs2_journal_dirty(handle, args->new_bh);
6644         }
6645 
6646 out_commit:
6647         ocfs2_commit_trans(osb, handle);
6648 
6649 out:
6650         ocfs2_free_alloc_context(meta_ac);
6651         return ret;
6652 }
6653 
6654 struct ocfs2_reflink_xattr_tree_args {
6655         struct ocfs2_xattr_reflink *reflink;
6656         struct buffer_head *old_blk_bh;
6657         struct buffer_head *new_blk_bh;
6658         struct ocfs2_xattr_bucket *old_bucket;
6659         struct ocfs2_xattr_bucket *new_bucket;
6660 };
6661 
6662 /*
6663  * NOTE:
6664  * We have to handle the case that both old bucket and new bucket
6665  * will call this function to get the right ret_bh.
6666  * So The caller must give us the right bh.
6667  */
6668 static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6669                                         struct buffer_head *bh,
6670                                         struct ocfs2_xattr_header *xh,
6671                                         int offset,
6672                                         struct ocfs2_xattr_value_root **xv,
6673                                         struct buffer_head **ret_bh,
6674                                         void *para)
6675 {
6676         struct ocfs2_reflink_xattr_tree_args *args =
6677                         (struct ocfs2_reflink_xattr_tree_args *)para;
6678         struct ocfs2_xattr_bucket *bucket;
6679 
6680         if (bh == args->old_bucket->bu_bhs[0])
6681                 bucket = args->old_bucket;
6682         else
6683                 bucket = args->new_bucket;
6684 
6685         return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6686                                                xv, ret_bh);
6687 }
6688 
6689 struct ocfs2_value_tree_metas {
6690         int num_metas;
6691         int credits;
6692         int num_recs;
6693 };
6694 
6695 static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6696                                         struct buffer_head *bh,
6697                                         struct ocfs2_xattr_header *xh,
6698                                         int offset,
6699                                         struct ocfs2_xattr_value_root **xv,
6700                                         struct buffer_head **ret_bh,
6701                                         void *para)
6702 {
6703         struct ocfs2_xattr_bucket *bucket =
6704                                 (struct ocfs2_xattr_bucket *)para;
6705 
6706         return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6707                                                xv, ret_bh);
6708 }
6709 
6710 static int ocfs2_calc_value_tree_metas(struct inode *inode,
6711                                       struct ocfs2_xattr_bucket *bucket,
6712                                       void *para)
6713 {
6714         struct ocfs2_value_tree_metas *metas =
6715                         (struct ocfs2_value_tree_metas *)para;
6716         struct ocfs2_xattr_header *xh =
6717                         (struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6718 
6719         /* Add the credits for this bucket first. */
6720         metas->credits += bucket->bu_blocks;
6721         return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6722                                         xh, &metas->num_metas,
6723                                         &metas->credits, &metas->num_recs,
6724                                         ocfs2_value_tree_metas_in_bucket,
6725                                         bucket);
6726 }
6727 
6728 /*
6729  * Given a xattr extent rec starting from blkno and having len clusters,
6730  * iterate all the buckets calculate how much metadata we need for reflinking
6731  * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6732  */
6733 static int ocfs2_lock_reflink_xattr_rec_allocators(
6734                                 struct ocfs2_reflink_xattr_tree_args *args,
6735                                 struct ocfs2_extent_tree *xt_et,
6736                                 u64 blkno, u32 len, int *credits,
6737                                 struct ocfs2_alloc_context **meta_ac,
6738                                 struct ocfs2_alloc_context **data_ac)
6739 {
6740         int ret, num_free_extents;
6741         struct ocfs2_value_tree_metas metas;
6742         struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6743         struct ocfs2_refcount_block *rb;
6744 
6745         memset(&metas, 0, sizeof(metas));
6746 
6747         ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6748                                           ocfs2_calc_value_tree_metas, &metas);
6749         if (ret) {
6750                 mlog_errno(ret);
6751                 goto out;
6752         }
6753 
6754         *credits = metas.credits;
6755 
6756         /*
6757          * Calculate we need for refcount tree change.
6758          *
6759          * We need to add/modify num_recs in refcount tree, so just calculate
6760          * an approximate number we need for refcount tree change.
6761          * Sometimes we need to split the tree, and after split,  half recs
6762          * will be moved to the new block, and a new block can only provide
6763          * half number of recs. So we multiple new blocks by 2.
6764          * In the end, we have to add credits for modifying the already
67