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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/file.c

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * file.c
  5  *
  6  * File open, close, extend, truncate
  7  *
  8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public
 12  * License as published by the Free Software Foundation; either
 13  * version 2 of the License, or (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public
 21  * License along with this program; if not, write to the
 22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 23  * Boston, MA 021110-1307, USA.
 24  */
 25 
 26 #include <linux/capability.h>
 27 #include <linux/fs.h>
 28 #include <linux/types.h>
 29 #include <linux/slab.h>
 30 #include <linux/highmem.h>
 31 #include <linux/pagemap.h>
 32 #include <linux/uio.h>
 33 #include <linux/sched.h>
 34 #include <linux/splice.h>
 35 #include <linux/mount.h>
 36 #include <linux/writeback.h>
 37 #include <linux/falloc.h>
 38 #include <linux/quotaops.h>
 39 #include <linux/blkdev.h>
 40 #include <linux/backing-dev.h>
 41 
 42 #include <cluster/masklog.h>
 43 
 44 #include "ocfs2.h"
 45 
 46 #include "alloc.h"
 47 #include "aops.h"
 48 #include "dir.h"
 49 #include "dlmglue.h"
 50 #include "extent_map.h"
 51 #include "file.h"
 52 #include "sysfile.h"
 53 #include "inode.h"
 54 #include "ioctl.h"
 55 #include "journal.h"
 56 #include "locks.h"
 57 #include "mmap.h"
 58 #include "suballoc.h"
 59 #include "super.h"
 60 #include "xattr.h"
 61 #include "acl.h"
 62 #include "quota.h"
 63 #include "refcounttree.h"
 64 #include "ocfs2_trace.h"
 65 
 66 #include "buffer_head_io.h"
 67 
 68 static int ocfs2_init_file_private(struct inode *inode, struct file *file)
 69 {
 70         struct ocfs2_file_private *fp;
 71 
 72         fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
 73         if (!fp)
 74                 return -ENOMEM;
 75 
 76         fp->fp_file = file;
 77         mutex_init(&fp->fp_mutex);
 78         ocfs2_file_lock_res_init(&fp->fp_flock, fp);
 79         file->private_data = fp;
 80 
 81         return 0;
 82 }
 83 
 84 static void ocfs2_free_file_private(struct inode *inode, struct file *file)
 85 {
 86         struct ocfs2_file_private *fp = file->private_data;
 87         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 88 
 89         if (fp) {
 90                 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
 91                 ocfs2_lock_res_free(&fp->fp_flock);
 92                 kfree(fp);
 93                 file->private_data = NULL;
 94         }
 95 }
 96 
 97 static int ocfs2_file_open(struct inode *inode, struct file *file)
 98 {
 99         int status;
100         int mode = file->f_flags;
101         struct ocfs2_inode_info *oi = OCFS2_I(inode);
102 
103         trace_ocfs2_file_open(inode, file, file->f_path.dentry,
104                               (unsigned long long)OCFS2_I(inode)->ip_blkno,
105                               file->f_path.dentry->d_name.len,
106                               file->f_path.dentry->d_name.name, mode);
107 
108         if (file->f_mode & FMODE_WRITE) {
109                 status = dquot_initialize(inode);
110                 if (status)
111                         goto leave;
112         }
113 
114         spin_lock(&oi->ip_lock);
115 
116         /* Check that the inode hasn't been wiped from disk by another
117          * node. If it hasn't then we're safe as long as we hold the
118          * spin lock until our increment of open count. */
119         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
120                 spin_unlock(&oi->ip_lock);
121 
122                 status = -ENOENT;
123                 goto leave;
124         }
125 
126         if (mode & O_DIRECT)
127                 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
128 
129         oi->ip_open_count++;
130         spin_unlock(&oi->ip_lock);
131 
132         status = ocfs2_init_file_private(inode, file);
133         if (status) {
134                 /*
135                  * We want to set open count back if we're failing the
136                  * open.
137                  */
138                 spin_lock(&oi->ip_lock);
139                 oi->ip_open_count--;
140                 spin_unlock(&oi->ip_lock);
141         }
142 
143 leave:
144         return status;
145 }
146 
147 static int ocfs2_file_release(struct inode *inode, struct file *file)
148 {
149         struct ocfs2_inode_info *oi = OCFS2_I(inode);
150 
151         spin_lock(&oi->ip_lock);
152         if (!--oi->ip_open_count)
153                 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
154 
155         trace_ocfs2_file_release(inode, file, file->f_path.dentry,
156                                  oi->ip_blkno,
157                                  file->f_path.dentry->d_name.len,
158                                  file->f_path.dentry->d_name.name,
159                                  oi->ip_open_count);
160         spin_unlock(&oi->ip_lock);
161 
162         ocfs2_free_file_private(inode, file);
163 
164         return 0;
165 }
166 
167 static int ocfs2_dir_open(struct inode *inode, struct file *file)
168 {
169         return ocfs2_init_file_private(inode, file);
170 }
171 
172 static int ocfs2_dir_release(struct inode *inode, struct file *file)
173 {
174         ocfs2_free_file_private(inode, file);
175         return 0;
176 }
177 
178 static int ocfs2_sync_file(struct file *file, loff_t start, loff_t end,
179                            int datasync)
180 {
181         int err = 0;
182         struct inode *inode = file->f_mapping->host;
183         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
184         struct ocfs2_inode_info *oi = OCFS2_I(inode);
185         journal_t *journal = osb->journal->j_journal;
186         int ret;
187         tid_t commit_tid;
188         bool needs_barrier = false;
189 
190         trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
191                               OCFS2_I(inode)->ip_blkno,
192                               file->f_path.dentry->d_name.len,
193                               file->f_path.dentry->d_name.name,
194                               (unsigned long long)datasync);
195 
196         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
197                 return -EROFS;
198 
199         err = filemap_write_and_wait_range(inode->i_mapping, start, end);
200         if (err)
201                 return err;
202 
203         commit_tid = datasync ? oi->i_datasync_tid : oi->i_sync_tid;
204         if (journal->j_flags & JBD2_BARRIER &&
205             !jbd2_trans_will_send_data_barrier(journal, commit_tid))
206                 needs_barrier = true;
207         err = jbd2_complete_transaction(journal, commit_tid);
208         if (needs_barrier) {
209                 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
210                 if (!err)
211                         err = ret;
212         }
213 
214         if (err)
215                 mlog_errno(err);
216 
217         return (err < 0) ? -EIO : 0;
218 }
219 
220 int ocfs2_should_update_atime(struct inode *inode,
221                               struct vfsmount *vfsmnt)
222 {
223         struct timespec now;
224         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
225 
226         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
227                 return 0;
228 
229         if ((inode->i_flags & S_NOATIME) ||
230             ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
231                 return 0;
232 
233         /*
234          * We can be called with no vfsmnt structure - NFSD will
235          * sometimes do this.
236          *
237          * Note that our action here is different than touch_atime() -
238          * if we can't tell whether this is a noatime mount, then we
239          * don't know whether to trust the value of s_atime_quantum.
240          */
241         if (vfsmnt == NULL)
242                 return 0;
243 
244         if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
245             ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
246                 return 0;
247 
248         if (vfsmnt->mnt_flags & MNT_RELATIME) {
249                 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
250                     (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
251                         return 1;
252 
253                 return 0;
254         }
255 
256         now = CURRENT_TIME;
257         if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
258                 return 0;
259         else
260                 return 1;
261 }
262 
263 int ocfs2_update_inode_atime(struct inode *inode,
264                              struct buffer_head *bh)
265 {
266         int ret;
267         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
268         handle_t *handle;
269         struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
270 
271         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
272         if (IS_ERR(handle)) {
273                 ret = PTR_ERR(handle);
274                 mlog_errno(ret);
275                 goto out;
276         }
277 
278         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
279                                       OCFS2_JOURNAL_ACCESS_WRITE);
280         if (ret) {
281                 mlog_errno(ret);
282                 goto out_commit;
283         }
284 
285         /*
286          * Don't use ocfs2_mark_inode_dirty() here as we don't always
287          * have i_mutex to guard against concurrent changes to other
288          * inode fields.
289          */
290         inode->i_atime = CURRENT_TIME;
291         di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
292         di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
293         ocfs2_update_inode_fsync_trans(handle, inode, 0);
294         ocfs2_journal_dirty(handle, bh);
295 
296 out_commit:
297         ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
298 out:
299         return ret;
300 }
301 
302 int ocfs2_set_inode_size(handle_t *handle,
303                                 struct inode *inode,
304                                 struct buffer_head *fe_bh,
305                                 u64 new_i_size)
306 {
307         int status;
308 
309         i_size_write(inode, new_i_size);
310         inode->i_blocks = ocfs2_inode_sector_count(inode);
311         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
312 
313         status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
314         if (status < 0) {
315                 mlog_errno(status);
316                 goto bail;
317         }
318 
319 bail:
320         return status;
321 }
322 
323 int ocfs2_simple_size_update(struct inode *inode,
324                              struct buffer_head *di_bh,
325                              u64 new_i_size)
326 {
327         int ret;
328         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
329         handle_t *handle = NULL;
330 
331         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
332         if (IS_ERR(handle)) {
333                 ret = PTR_ERR(handle);
334                 mlog_errno(ret);
335                 goto out;
336         }
337 
338         ret = ocfs2_set_inode_size(handle, inode, di_bh,
339                                    new_i_size);
340         if (ret < 0)
341                 mlog_errno(ret);
342 
343         ocfs2_update_inode_fsync_trans(handle, inode, 0);
344         ocfs2_commit_trans(osb, handle);
345 out:
346         return ret;
347 }
348 
349 static int ocfs2_cow_file_pos(struct inode *inode,
350                               struct buffer_head *fe_bh,
351                               u64 offset)
352 {
353         int status;
354         u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
355         unsigned int num_clusters = 0;
356         unsigned int ext_flags = 0;
357 
358         /*
359          * If the new offset is aligned to the range of the cluster, there is
360          * no space for ocfs2_zero_range_for_truncate to fill, so no need to
361          * CoW either.
362          */
363         if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
364                 return 0;
365 
366         status = ocfs2_get_clusters(inode, cpos, &phys,
367                                     &num_clusters, &ext_flags);
368         if (status) {
369                 mlog_errno(status);
370                 goto out;
371         }
372 
373         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
374                 goto out;
375 
376         return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
377 
378 out:
379         return status;
380 }
381 
382 static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
383                                      struct inode *inode,
384                                      struct buffer_head *fe_bh,
385                                      u64 new_i_size)
386 {
387         int status;
388         handle_t *handle;
389         struct ocfs2_dinode *di;
390         u64 cluster_bytes;
391 
392         /*
393          * We need to CoW the cluster contains the offset if it is reflinked
394          * since we will call ocfs2_zero_range_for_truncate later which will
395          * write "" from offset to the end of the cluster.
396          */
397         status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
398         if (status) {
399                 mlog_errno(status);
400                 return status;
401         }
402 
403         /* TODO: This needs to actually orphan the inode in this
404          * transaction. */
405 
406         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
407         if (IS_ERR(handle)) {
408                 status = PTR_ERR(handle);
409                 mlog_errno(status);
410                 goto out;
411         }
412 
413         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
414                                          OCFS2_JOURNAL_ACCESS_WRITE);
415         if (status < 0) {
416                 mlog_errno(status);
417                 goto out_commit;
418         }
419 
420         /*
421          * Do this before setting i_size.
422          */
423         cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
424         status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
425                                                cluster_bytes);
426         if (status) {
427                 mlog_errno(status);
428                 goto out_commit;
429         }
430 
431         i_size_write(inode, new_i_size);
432         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
433 
434         di = (struct ocfs2_dinode *) fe_bh->b_data;
435         di->i_size = cpu_to_le64(new_i_size);
436         di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
437         di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
438         ocfs2_update_inode_fsync_trans(handle, inode, 0);
439 
440         ocfs2_journal_dirty(handle, fe_bh);
441 
442 out_commit:
443         ocfs2_commit_trans(osb, handle);
444 out:
445         return status;
446 }
447 
448 int ocfs2_truncate_file(struct inode *inode,
449                                struct buffer_head *di_bh,
450                                u64 new_i_size)
451 {
452         int status = 0;
453         struct ocfs2_dinode *fe = NULL;
454         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
455 
456         /* We trust di_bh because it comes from ocfs2_inode_lock(), which
457          * already validated it */
458         fe = (struct ocfs2_dinode *) di_bh->b_data;
459 
460         trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno,
461                                   (unsigned long long)le64_to_cpu(fe->i_size),
462                                   (unsigned long long)new_i_size);
463 
464         mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
465                         "Inode %llu, inode i_size = %lld != di "
466                         "i_size = %llu, i_flags = 0x%x\n",
467                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
468                         i_size_read(inode),
469                         (unsigned long long)le64_to_cpu(fe->i_size),
470                         le32_to_cpu(fe->i_flags));
471 
472         if (new_i_size > le64_to_cpu(fe->i_size)) {
473                 trace_ocfs2_truncate_file_error(
474                         (unsigned long long)le64_to_cpu(fe->i_size),
475                         (unsigned long long)new_i_size);
476                 status = -EINVAL;
477                 mlog_errno(status);
478                 goto bail;
479         }
480 
481         down_write(&OCFS2_I(inode)->ip_alloc_sem);
482 
483         ocfs2_resv_discard(&osb->osb_la_resmap,
484                            &OCFS2_I(inode)->ip_la_data_resv);
485 
486         /*
487          * The inode lock forced other nodes to sync and drop their
488          * pages, which (correctly) happens even if we have a truncate
489          * without allocation change - ocfs2 cluster sizes can be much
490          * greater than page size, so we have to truncate them
491          * anyway.
492          */
493         unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
494         truncate_inode_pages(inode->i_mapping, new_i_size);
495 
496         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
497                 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
498                                                i_size_read(inode), 1);
499                 if (status)
500                         mlog_errno(status);
501 
502                 goto bail_unlock_sem;
503         }
504 
505         /* alright, we're going to need to do a full blown alloc size
506          * change. Orphan the inode so that recovery can complete the
507          * truncate if necessary. This does the task of marking
508          * i_size. */
509         status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
510         if (status < 0) {
511                 mlog_errno(status);
512                 goto bail_unlock_sem;
513         }
514 
515         status = ocfs2_commit_truncate(osb, inode, di_bh);
516         if (status < 0) {
517                 mlog_errno(status);
518                 goto bail_unlock_sem;
519         }
520 
521         /* TODO: orphan dir cleanup here. */
522 bail_unlock_sem:
523         up_write(&OCFS2_I(inode)->ip_alloc_sem);
524 
525 bail:
526         if (!status && OCFS2_I(inode)->ip_clusters == 0)
527                 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
528 
529         return status;
530 }
531 
532 /*
533  * extend file allocation only here.
534  * we'll update all the disk stuff, and oip->alloc_size
535  *
536  * expect stuff to be locked, a transaction started and enough data /
537  * metadata reservations in the contexts.
538  *
539  * Will return -EAGAIN, and a reason if a restart is needed.
540  * If passed in, *reason will always be set, even in error.
541  */
542 int ocfs2_add_inode_data(struct ocfs2_super *osb,
543                          struct inode *inode,
544                          u32 *logical_offset,
545                          u32 clusters_to_add,
546                          int mark_unwritten,
547                          struct buffer_head *fe_bh,
548                          handle_t *handle,
549                          struct ocfs2_alloc_context *data_ac,
550                          struct ocfs2_alloc_context *meta_ac,
551                          enum ocfs2_alloc_restarted *reason_ret)
552 {
553         int ret;
554         struct ocfs2_extent_tree et;
555 
556         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
557         ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
558                                           clusters_to_add, mark_unwritten,
559                                           data_ac, meta_ac, reason_ret);
560 
561         return ret;
562 }
563 
564 static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
565                                      u32 clusters_to_add, int mark_unwritten)
566 {
567         int status = 0;
568         int restart_func = 0;
569         int credits;
570         u32 prev_clusters;
571         struct buffer_head *bh = NULL;
572         struct ocfs2_dinode *fe = NULL;
573         handle_t *handle = NULL;
574         struct ocfs2_alloc_context *data_ac = NULL;
575         struct ocfs2_alloc_context *meta_ac = NULL;
576         enum ocfs2_alloc_restarted why = RESTART_NONE;
577         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
578         struct ocfs2_extent_tree et;
579         int did_quota = 0;
580 
581         /*
582          * Unwritten extent only exists for file systems which
583          * support holes.
584          */
585         BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
586 
587         status = ocfs2_read_inode_block(inode, &bh);
588         if (status < 0) {
589                 mlog_errno(status);
590                 goto leave;
591         }
592         fe = (struct ocfs2_dinode *) bh->b_data;
593 
594 restart_all:
595         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
596 
597         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
598         status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
599                                        &data_ac, &meta_ac);
600         if (status) {
601                 mlog_errno(status);
602                 goto leave;
603         }
604 
605         credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list);
606         handle = ocfs2_start_trans(osb, credits);
607         if (IS_ERR(handle)) {
608                 status = PTR_ERR(handle);
609                 handle = NULL;
610                 mlog_errno(status);
611                 goto leave;
612         }
613 
614 restarted_transaction:
615         trace_ocfs2_extend_allocation(
616                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
617                 (unsigned long long)i_size_read(inode),
618                 le32_to_cpu(fe->i_clusters), clusters_to_add,
619                 why, restart_func);
620 
621         status = dquot_alloc_space_nodirty(inode,
622                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
623         if (status)
624                 goto leave;
625         did_quota = 1;
626 
627         /* reserve a write to the file entry early on - that we if we
628          * run out of credits in the allocation path, we can still
629          * update i_size. */
630         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
631                                          OCFS2_JOURNAL_ACCESS_WRITE);
632         if (status < 0) {
633                 mlog_errno(status);
634                 goto leave;
635         }
636 
637         prev_clusters = OCFS2_I(inode)->ip_clusters;
638 
639         status = ocfs2_add_inode_data(osb,
640                                       inode,
641                                       &logical_start,
642                                       clusters_to_add,
643                                       mark_unwritten,
644                                       bh,
645                                       handle,
646                                       data_ac,
647                                       meta_ac,
648                                       &why);
649         if ((status < 0) && (status != -EAGAIN)) {
650                 if (status != -ENOSPC)
651                         mlog_errno(status);
652                 goto leave;
653         }
654         ocfs2_update_inode_fsync_trans(handle, inode, 1);
655         ocfs2_journal_dirty(handle, bh);
656 
657         spin_lock(&OCFS2_I(inode)->ip_lock);
658         clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
659         spin_unlock(&OCFS2_I(inode)->ip_lock);
660         /* Release unused quota reservation */
661         dquot_free_space(inode,
662                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
663         did_quota = 0;
664 
665         if (why != RESTART_NONE && clusters_to_add) {
666                 if (why == RESTART_META) {
667                         restart_func = 1;
668                         status = 0;
669                 } else {
670                         BUG_ON(why != RESTART_TRANS);
671 
672                         status = ocfs2_allocate_extend_trans(handle, 1);
673                         if (status < 0) {
674                                 /* handle still has to be committed at
675                                  * this point. */
676                                 status = -ENOMEM;
677                                 mlog_errno(status);
678                                 goto leave;
679                         }
680                         goto restarted_transaction;
681                 }
682         }
683 
684         trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno,
685              le32_to_cpu(fe->i_clusters),
686              (unsigned long long)le64_to_cpu(fe->i_size),
687              OCFS2_I(inode)->ip_clusters,
688              (unsigned long long)i_size_read(inode));
689 
690 leave:
691         if (status < 0 && did_quota)
692                 dquot_free_space(inode,
693                         ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
694         if (handle) {
695                 ocfs2_commit_trans(osb, handle);
696                 handle = NULL;
697         }
698         if (data_ac) {
699                 ocfs2_free_alloc_context(data_ac);
700                 data_ac = NULL;
701         }
702         if (meta_ac) {
703                 ocfs2_free_alloc_context(meta_ac);
704                 meta_ac = NULL;
705         }
706         if ((!status) && restart_func) {
707                 restart_func = 0;
708                 goto restart_all;
709         }
710         brelse(bh);
711         bh = NULL;
712 
713         return status;
714 }
715 
716 int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
717                 u32 clusters_to_add, int mark_unwritten)
718 {
719         return __ocfs2_extend_allocation(inode, logical_start,
720                         clusters_to_add, mark_unwritten);
721 }
722 
723 /*
724  * While a write will already be ordering the data, a truncate will not.
725  * Thus, we need to explicitly order the zeroed pages.
726  */
727 static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode,
728                                                 struct buffer_head *di_bh)
729 {
730         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
731         handle_t *handle = NULL;
732         int ret = 0;
733 
734         if (!ocfs2_should_order_data(inode))
735                 goto out;
736 
737         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
738         if (IS_ERR(handle)) {
739                 ret = -ENOMEM;
740                 mlog_errno(ret);
741                 goto out;
742         }
743 
744         ret = ocfs2_jbd2_file_inode(handle, inode);
745         if (ret < 0) {
746                 mlog_errno(ret);
747                 goto out;
748         }
749 
750         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
751                                       OCFS2_JOURNAL_ACCESS_WRITE);
752         if (ret)
753                 mlog_errno(ret);
754         ocfs2_update_inode_fsync_trans(handle, inode, 1);
755 
756 out:
757         if (ret) {
758                 if (!IS_ERR(handle))
759                         ocfs2_commit_trans(osb, handle);
760                 handle = ERR_PTR(ret);
761         }
762         return handle;
763 }
764 
765 /* Some parts of this taken from generic_cont_expand, which turned out
766  * to be too fragile to do exactly what we need without us having to
767  * worry about recursive locking in ->write_begin() and ->write_end(). */
768 static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
769                                  u64 abs_to, struct buffer_head *di_bh)
770 {
771         struct address_space *mapping = inode->i_mapping;
772         struct page *page;
773         unsigned long index = abs_from >> PAGE_SHIFT;
774         handle_t *handle;
775         int ret = 0;
776         unsigned zero_from, zero_to, block_start, block_end;
777         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
778 
779         BUG_ON(abs_from >= abs_to);
780         BUG_ON(abs_to > (((u64)index + 1) << PAGE_SHIFT));
781         BUG_ON(abs_from & (inode->i_blkbits - 1));
782 
783         handle = ocfs2_zero_start_ordered_transaction(inode, di_bh);
784         if (IS_ERR(handle)) {
785                 ret = PTR_ERR(handle);
786                 goto out;
787         }
788 
789         page = find_or_create_page(mapping, index, GFP_NOFS);
790         if (!page) {
791                 ret = -ENOMEM;
792                 mlog_errno(ret);
793                 goto out_commit_trans;
794         }
795 
796         /* Get the offsets within the page that we want to zero */
797         zero_from = abs_from & (PAGE_SIZE - 1);
798         zero_to = abs_to & (PAGE_SIZE - 1);
799         if (!zero_to)
800                 zero_to = PAGE_SIZE;
801 
802         trace_ocfs2_write_zero_page(
803                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
804                         (unsigned long long)abs_from,
805                         (unsigned long long)abs_to,
806                         index, zero_from, zero_to);
807 
808         /* We know that zero_from is block aligned */
809         for (block_start = zero_from; block_start < zero_to;
810              block_start = block_end) {
811                 block_end = block_start + (1 << inode->i_blkbits);
812 
813                 /*
814                  * block_start is block-aligned.  Bump it by one to force
815                  * __block_write_begin and block_commit_write to zero the
816                  * whole block.
817                  */
818                 ret = __block_write_begin(page, block_start + 1, 0,
819                                           ocfs2_get_block);
820                 if (ret < 0) {
821                         mlog_errno(ret);
822                         goto out_unlock;
823                 }
824 
825 
826                 /* must not update i_size! */
827                 ret = block_commit_write(page, block_start + 1,
828                                          block_start + 1);
829                 if (ret < 0)
830                         mlog_errno(ret);
831                 else
832                         ret = 0;
833         }
834 
835         /*
836          * fs-writeback will release the dirty pages without page lock
837          * whose offset are over inode size, the release happens at
838          * block_write_full_page().
839          */
840         i_size_write(inode, abs_to);
841         inode->i_blocks = ocfs2_inode_sector_count(inode);
842         di->i_size = cpu_to_le64((u64)i_size_read(inode));
843         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
844         di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
845         di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
846         di->i_mtime_nsec = di->i_ctime_nsec;
847         if (handle) {
848                 ocfs2_journal_dirty(handle, di_bh);
849                 ocfs2_update_inode_fsync_trans(handle, inode, 1);
850         }
851 
852 out_unlock:
853         unlock_page(page);
854         put_page(page);
855 out_commit_trans:
856         if (handle)
857                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
858 out:
859         return ret;
860 }
861 
862 /*
863  * Find the next range to zero.  We do this in terms of bytes because
864  * that's what ocfs2_zero_extend() wants, and it is dealing with the
865  * pagecache.  We may return multiple extents.
866  *
867  * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
868  * needs to be zeroed.  range_start and range_end return the next zeroing
869  * range.  A subsequent call should pass the previous range_end as its
870  * zero_start.  If range_end is 0, there's nothing to do.
871  *
872  * Unwritten extents are skipped over.  Refcounted extents are CoWd.
873  */
874 static int ocfs2_zero_extend_get_range(struct inode *inode,
875                                        struct buffer_head *di_bh,
876                                        u64 zero_start, u64 zero_end,
877                                        u64 *range_start, u64 *range_end)
878 {
879         int rc = 0, needs_cow = 0;
880         u32 p_cpos, zero_clusters = 0;
881         u32 zero_cpos =
882                 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
883         u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
884         unsigned int num_clusters = 0;
885         unsigned int ext_flags = 0;
886 
887         while (zero_cpos < last_cpos) {
888                 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
889                                         &num_clusters, &ext_flags);
890                 if (rc) {
891                         mlog_errno(rc);
892                         goto out;
893                 }
894 
895                 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
896                         zero_clusters = num_clusters;
897                         if (ext_flags & OCFS2_EXT_REFCOUNTED)
898                                 needs_cow = 1;
899                         break;
900                 }
901 
902                 zero_cpos += num_clusters;
903         }
904         if (!zero_clusters) {
905                 *range_end = 0;
906                 goto out;
907         }
908 
909         while ((zero_cpos + zero_clusters) < last_cpos) {
910                 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
911                                         &p_cpos, &num_clusters,
912                                         &ext_flags);
913                 if (rc) {
914                         mlog_errno(rc);
915                         goto out;
916                 }
917 
918                 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
919                         break;
920                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
921                         needs_cow = 1;
922                 zero_clusters += num_clusters;
923         }
924         if ((zero_cpos + zero_clusters) > last_cpos)
925                 zero_clusters = last_cpos - zero_cpos;
926 
927         if (needs_cow) {
928                 rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos,
929                                         zero_clusters, UINT_MAX);
930                 if (rc) {
931                         mlog_errno(rc);
932                         goto out;
933                 }
934         }
935 
936         *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
937         *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
938                                              zero_cpos + zero_clusters);
939 
940 out:
941         return rc;
942 }
943 
944 /*
945  * Zero one range returned from ocfs2_zero_extend_get_range().  The caller
946  * has made sure that the entire range needs zeroing.
947  */
948 static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
949                                    u64 range_end, struct buffer_head *di_bh)
950 {
951         int rc = 0;
952         u64 next_pos;
953         u64 zero_pos = range_start;
954 
955         trace_ocfs2_zero_extend_range(
956                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
957                         (unsigned long long)range_start,
958                         (unsigned long long)range_end);
959         BUG_ON(range_start >= range_end);
960 
961         while (zero_pos < range_end) {
962                 next_pos = (zero_pos & PAGE_MASK) + PAGE_SIZE;
963                 if (next_pos > range_end)
964                         next_pos = range_end;
965                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos, di_bh);
966                 if (rc < 0) {
967                         mlog_errno(rc);
968                         break;
969                 }
970                 zero_pos = next_pos;
971 
972                 /*
973                  * Very large extends have the potential to lock up
974                  * the cpu for extended periods of time.
975                  */
976                 cond_resched();
977         }
978 
979         return rc;
980 }
981 
982 int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
983                       loff_t zero_to_size)
984 {
985         int ret = 0;
986         u64 zero_start, range_start = 0, range_end = 0;
987         struct super_block *sb = inode->i_sb;
988 
989         zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
990         trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno,
991                                 (unsigned long long)zero_start,
992                                 (unsigned long long)i_size_read(inode));
993         while (zero_start < zero_to_size) {
994                 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
995                                                   zero_to_size,
996                                                   &range_start,
997                                                   &range_end);
998                 if (ret) {
999                         mlog_errno(ret);
1000                         break;
1001                 }
1002                 if (!range_end)
1003                         break;
1004                 /* Trim the ends */
1005                 if (range_start < zero_start)
1006                         range_start = zero_start;
1007                 if (range_end > zero_to_size)
1008                         range_end = zero_to_size;
1009 
1010                 ret = ocfs2_zero_extend_range(inode, range_start,
1011                                               range_end, di_bh);
1012                 if (ret) {
1013                         mlog_errno(ret);
1014                         break;
1015                 }
1016                 zero_start = range_end;
1017         }
1018 
1019         return ret;
1020 }
1021 
1022 int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
1023                           u64 new_i_size, u64 zero_to)
1024 {
1025         int ret;
1026         u32 clusters_to_add;
1027         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1028 
1029         /*
1030          * Only quota files call this without a bh, and they can't be
1031          * refcounted.
1032          */
1033         BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
1034         BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1035 
1036         clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1037         if (clusters_to_add < oi->ip_clusters)
1038                 clusters_to_add = 0;
1039         else
1040                 clusters_to_add -= oi->ip_clusters;
1041 
1042         if (clusters_to_add) {
1043                 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1044                                                 clusters_to_add, 0);
1045                 if (ret) {
1046                         mlog_errno(ret);
1047                         goto out;
1048                 }
1049         }
1050 
1051         /*
1052          * Call this even if we don't add any clusters to the tree. We
1053          * still need to zero the area between the old i_size and the
1054          * new i_size.
1055          */
1056         ret = ocfs2_zero_extend(inode, di_bh, zero_to);
1057         if (ret < 0)
1058                 mlog_errno(ret);
1059 
1060 out:
1061         return ret;
1062 }
1063 
1064 static int ocfs2_extend_file(struct inode *inode,
1065                              struct buffer_head *di_bh,
1066                              u64 new_i_size)
1067 {
1068         int ret = 0;
1069         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1070 
1071         BUG_ON(!di_bh);
1072 
1073         /* setattr sometimes calls us like this. */
1074         if (new_i_size == 0)
1075                 goto out;
1076 
1077         if (i_size_read(inode) == new_i_size)
1078                 goto out;
1079         BUG_ON(new_i_size < i_size_read(inode));
1080 
1081         /*
1082          * The alloc sem blocks people in read/write from reading our
1083          * allocation until we're done changing it. We depend on
1084          * i_mutex to block other extend/truncate calls while we're
1085          * here.  We even have to hold it for sparse files because there
1086          * might be some tail zeroing.
1087          */
1088         down_write(&oi->ip_alloc_sem);
1089 
1090         if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1091                 /*
1092                  * We can optimize small extends by keeping the inodes
1093                  * inline data.
1094                  */
1095                 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1096                         up_write(&oi->ip_alloc_sem);
1097                         goto out_update_size;
1098                 }
1099 
1100                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1101                 if (ret) {
1102                         up_write(&oi->ip_alloc_sem);
1103                         mlog_errno(ret);
1104                         goto out;
1105                 }
1106         }
1107 
1108         if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1109                 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1110         else
1111                 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1112                                             new_i_size);
1113 
1114         up_write(&oi->ip_alloc_sem);
1115 
1116         if (ret < 0) {
1117                 mlog_errno(ret);
1118                 goto out;
1119         }
1120 
1121 out_update_size:
1122         ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1123         if (ret < 0)
1124                 mlog_errno(ret);
1125 
1126 out:
1127         return ret;
1128 }
1129 
1130 int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1131 {
1132         int status = 0, size_change;
1133         int inode_locked = 0;
1134         struct inode *inode = d_inode(dentry);
1135         struct super_block *sb = inode->i_sb;
1136         struct ocfs2_super *osb = OCFS2_SB(sb);
1137         struct buffer_head *bh = NULL;
1138         handle_t *handle = NULL;
1139         struct dquot *transfer_to[MAXQUOTAS] = { };
1140         int qtype;
1141 
1142         trace_ocfs2_setattr(inode, dentry,
1143                             (unsigned long long)OCFS2_I(inode)->ip_blkno,
1144                             dentry->d_name.len, dentry->d_name.name,
1145                             attr->ia_valid, attr->ia_mode,
1146                             from_kuid(&init_user_ns, attr->ia_uid),
1147                             from_kgid(&init_user_ns, attr->ia_gid));
1148 
1149         /* ensuring we don't even attempt to truncate a symlink */
1150         if (S_ISLNK(inode->i_mode))
1151                 attr->ia_valid &= ~ATTR_SIZE;
1152 
1153 #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1154                            | ATTR_GID | ATTR_UID | ATTR_MODE)
1155         if (!(attr->ia_valid & OCFS2_VALID_ATTRS))
1156                 return 0;
1157 
1158         status = inode_change_ok(inode, attr);
1159         if (status)
1160                 return status;
1161 
1162         if (is_quota_modification(inode, attr)) {
1163                 status = dquot_initialize(inode);
1164                 if (status)
1165                         return status;
1166         }
1167         size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1168         if (size_change) {
1169                 status = ocfs2_rw_lock(inode, 1);
1170                 if (status < 0) {
1171                         mlog_errno(status);
1172                         goto bail;
1173                 }
1174         }
1175 
1176         status = ocfs2_inode_lock(inode, &bh, 1);
1177         if (status < 0) {
1178                 if (status != -ENOENT)
1179                         mlog_errno(status);
1180                 goto bail_unlock_rw;
1181         }
1182         inode_locked = 1;
1183 
1184         if (size_change) {
1185                 status = inode_newsize_ok(inode, attr->ia_size);
1186                 if (status)
1187                         goto bail_unlock;
1188 
1189                 inode_dio_wait(inode);
1190 
1191                 if (i_size_read(inode) >= attr->ia_size) {
1192                         if (ocfs2_should_order_data(inode)) {
1193                                 status = ocfs2_begin_ordered_truncate(inode,
1194                                                                       attr->ia_size);
1195                                 if (status)
1196                                         goto bail_unlock;
1197                         }
1198                         status = ocfs2_truncate_file(inode, bh, attr->ia_size);
1199                 } else
1200                         status = ocfs2_extend_file(inode, bh, attr->ia_size);
1201                 if (status < 0) {
1202                         if (status != -ENOSPC)
1203                                 mlog_errno(status);
1204                         status = -ENOSPC;
1205                         goto bail_unlock;
1206                 }
1207         }
1208 
1209         if ((attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
1210             (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
1211                 /*
1212                  * Gather pointers to quota structures so that allocation /
1213                  * freeing of quota structures happens here and not inside
1214                  * dquot_transfer() where we have problems with lock ordering
1215                  */
1216                 if (attr->ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)
1217                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1218                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1219                         transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
1220                         if (IS_ERR(transfer_to[USRQUOTA])) {
1221                                 status = PTR_ERR(transfer_to[USRQUOTA]);
1222                                 goto bail_unlock;
1223                         }
1224                 }
1225                 if (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid)
1226                     && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1227                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1228                         transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
1229                         if (IS_ERR(transfer_to[GRPQUOTA])) {
1230                                 status = PTR_ERR(transfer_to[GRPQUOTA]);
1231                                 goto bail_unlock;
1232                         }
1233                 }
1234                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1235                                            2 * ocfs2_quota_trans_credits(sb));
1236                 if (IS_ERR(handle)) {
1237                         status = PTR_ERR(handle);
1238                         mlog_errno(status);
1239                         goto bail_unlock;
1240                 }
1241                 status = __dquot_transfer(inode, transfer_to);
1242                 if (status < 0)
1243                         goto bail_commit;
1244         } else {
1245                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1246                 if (IS_ERR(handle)) {
1247                         status = PTR_ERR(handle);
1248                         mlog_errno(status);
1249                         goto bail_unlock;
1250                 }
1251         }
1252 
1253         setattr_copy(inode, attr);
1254         mark_inode_dirty(inode);
1255 
1256         status = ocfs2_mark_inode_dirty(handle, inode, bh);
1257         if (status < 0)
1258                 mlog_errno(status);
1259 
1260 bail_commit:
1261         ocfs2_commit_trans(osb, handle);
1262 bail_unlock:
1263         if (status) {
1264                 ocfs2_inode_unlock(inode, 1);
1265                 inode_locked = 0;
1266         }
1267 bail_unlock_rw:
1268         if (size_change)
1269                 ocfs2_rw_unlock(inode, 1);
1270 bail:
1271 
1272         /* Release quota pointers in case we acquired them */
1273         for (qtype = 0; qtype < OCFS2_MAXQUOTAS; qtype++)
1274                 dqput(transfer_to[qtype]);
1275 
1276         if (!status && attr->ia_valid & ATTR_MODE) {
1277                 status = ocfs2_acl_chmod(inode, bh);
1278                 if (status < 0)
1279                         mlog_errno(status);
1280         }
1281         if (inode_locked)
1282                 ocfs2_inode_unlock(inode, 1);
1283 
1284         brelse(bh);
1285         return status;
1286 }
1287 
1288 int ocfs2_getattr(struct vfsmount *mnt,
1289                   struct dentry *dentry,
1290                   struct kstat *stat)
1291 {
1292         struct inode *inode = d_inode(dentry);
1293         struct super_block *sb = d_inode(dentry)->i_sb;
1294         struct ocfs2_super *osb = sb->s_fs_info;
1295         int err;
1296 
1297         err = ocfs2_inode_revalidate(dentry);
1298         if (err) {
1299                 if (err != -ENOENT)
1300                         mlog_errno(err);
1301                 goto bail;
1302         }
1303 
1304         generic_fillattr(inode, stat);
1305         /*
1306          * If there is inline data in the inode, the inode will normally not
1307          * have data blocks allocated (it may have an external xattr block).
1308          * Report at least one sector for such files, so tools like tar, rsync,
1309          * others don't incorrectly think the file is completely sparse.
1310          */
1311         if (unlikely(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1312                 stat->blocks += (stat->size + 511)>>9;
1313 
1314         /* We set the blksize from the cluster size for performance */
1315         stat->blksize = osb->s_clustersize;
1316 
1317 bail:
1318         return err;
1319 }
1320 
1321 int ocfs2_permission(struct inode *inode, int mask)
1322 {
1323         int ret;
1324 
1325         if (mask & MAY_NOT_BLOCK)
1326                 return -ECHILD;
1327 
1328         ret = ocfs2_inode_lock(inode, NULL, 0);
1329         if (ret) {
1330                 if (ret != -ENOENT)
1331                         mlog_errno(ret);
1332                 goto out;
1333         }
1334 
1335         ret = generic_permission(inode, mask);
1336 
1337         ocfs2_inode_unlock(inode, 0);
1338 out:
1339         return ret;
1340 }
1341 
1342 static int __ocfs2_write_remove_suid(struct inode *inode,
1343                                      struct buffer_head *bh)
1344 {
1345         int ret;
1346         handle_t *handle;
1347         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1348         struct ocfs2_dinode *di;
1349 
1350         trace_ocfs2_write_remove_suid(
1351                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1352                         inode->i_mode);
1353 
1354         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1355         if (IS_ERR(handle)) {
1356                 ret = PTR_ERR(handle);
1357                 mlog_errno(ret);
1358                 goto out;
1359         }
1360 
1361         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1362                                       OCFS2_JOURNAL_ACCESS_WRITE);
1363         if (ret < 0) {
1364                 mlog_errno(ret);
1365                 goto out_trans;
1366         }
1367 
1368         inode->i_mode &= ~S_ISUID;
1369         if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1370                 inode->i_mode &= ~S_ISGID;
1371 
1372         di = (struct ocfs2_dinode *) bh->b_data;
1373         di->i_mode = cpu_to_le16(inode->i_mode);
1374         ocfs2_update_inode_fsync_trans(handle, inode, 0);
1375 
1376         ocfs2_journal_dirty(handle, bh);
1377 
1378 out_trans:
1379         ocfs2_commit_trans(osb, handle);
1380 out:
1381         return ret;
1382 }
1383 
1384 static int ocfs2_write_remove_suid(struct inode *inode)
1385 {
1386         int ret;
1387         struct buffer_head *bh = NULL;
1388 
1389         ret = ocfs2_read_inode_block(inode, &bh);
1390         if (ret < 0) {
1391                 mlog_errno(ret);
1392                 goto out;
1393         }
1394 
1395         ret =  __ocfs2_write_remove_suid(inode, bh);
1396 out:
1397         brelse(bh);
1398         return ret;
1399 }
1400 
1401 /*
1402  * Allocate enough extents to cover the region starting at byte offset
1403  * start for len bytes. Existing extents are skipped, any extents
1404  * added are marked as "unwritten".
1405  */
1406 static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1407                                             u64 start, u64 len)
1408 {
1409         int ret;
1410         u32 cpos, phys_cpos, clusters, alloc_size;
1411         u64 end = start + len;
1412         struct buffer_head *di_bh = NULL;
1413 
1414         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1415                 ret = ocfs2_read_inode_block(inode, &di_bh);
1416                 if (ret) {
1417                         mlog_errno(ret);
1418                         goto out;
1419                 }
1420 
1421                 /*
1422                  * Nothing to do if the requested reservation range
1423                  * fits within the inode.
1424                  */
1425                 if (ocfs2_size_fits_inline_data(di_bh, end))
1426                         goto out;
1427 
1428                 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1429                 if (ret) {
1430                         mlog_errno(ret);
1431                         goto out;
1432                 }
1433         }
1434 
1435         /*
1436          * We consider both start and len to be inclusive.
1437          */
1438         cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1439         clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1440         clusters -= cpos;
1441 
1442         while (clusters) {
1443                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1444                                          &alloc_size, NULL);
1445                 if (ret) {
1446                         mlog_errno(ret);
1447                         goto out;
1448                 }
1449 
1450                 /*
1451                  * Hole or existing extent len can be arbitrary, so
1452                  * cap it to our own allocation request.
1453                  */
1454                 if (alloc_size > clusters)
1455                         alloc_size = clusters;
1456 
1457                 if (phys_cpos) {
1458                         /*
1459                          * We already have an allocation at this
1460                          * region so we can safely skip it.
1461                          */
1462                         goto next;
1463                 }
1464 
1465                 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1466                 if (ret) {
1467                         if (ret != -ENOSPC)
1468                                 mlog_errno(ret);
1469                         goto out;
1470                 }
1471 
1472 next:
1473                 cpos += alloc_size;
1474                 clusters -= alloc_size;
1475         }
1476 
1477         ret = 0;
1478 out:
1479 
1480         brelse(di_bh);
1481         return ret;
1482 }
1483 
1484 /*
1485  * Truncate a byte range, avoiding pages within partial clusters. This
1486  * preserves those pages for the zeroing code to write to.
1487  */
1488 static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1489                                          u64 byte_len)
1490 {
1491         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1492         loff_t start, end;
1493         struct address_space *mapping = inode->i_mapping;
1494 
1495         start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1496         end = byte_start + byte_len;
1497         end = end & ~(osb->s_clustersize - 1);
1498 
1499         if (start < end) {
1500                 unmap_mapping_range(mapping, start, end - start, 0);
1501                 truncate_inode_pages_range(mapping, start, end - 1);
1502         }
1503 }
1504 
1505 static int ocfs2_zero_partial_clusters(struct inode *inode,
1506                                        u64 start, u64 len)
1507 {
1508         int ret = 0;
1509         u64 tmpend, end = start + len;
1510         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1511         unsigned int csize = osb->s_clustersize;
1512         handle_t *handle;
1513 
1514         /*
1515          * The "start" and "end" values are NOT necessarily part of
1516          * the range whose allocation is being deleted. Rather, this
1517          * is what the user passed in with the request. We must zero
1518          * partial clusters here. There's no need to worry about
1519          * physical allocation - the zeroing code knows to skip holes.
1520          */
1521         trace_ocfs2_zero_partial_clusters(
1522                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1523                 (unsigned long long)start, (unsigned long long)end);
1524 
1525         /*
1526          * If both edges are on a cluster boundary then there's no
1527          * zeroing required as the region is part of the allocation to
1528          * be truncated.
1529          */
1530         if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1531                 goto out;
1532 
1533         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1534         if (IS_ERR(handle)) {
1535                 ret = PTR_ERR(handle);
1536                 mlog_errno(ret);
1537                 goto out;
1538         }
1539 
1540         /*
1541          * We want to get the byte offset of the end of the 1st cluster.
1542          */
1543         tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1544         if (tmpend > end)
1545                 tmpend = end;
1546 
1547         trace_ocfs2_zero_partial_clusters_range1((unsigned long long)start,
1548                                                  (unsigned long long)tmpend);
1549 
1550         ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1551         if (ret)
1552                 mlog_errno(ret);
1553 
1554         if (tmpend < end) {
1555                 /*
1556                  * This may make start and end equal, but the zeroing
1557                  * code will skip any work in that case so there's no
1558                  * need to catch it up here.
1559                  */
1560                 start = end & ~(osb->s_clustersize - 1);
1561 
1562                 trace_ocfs2_zero_partial_clusters_range2(
1563                         (unsigned long long)start, (unsigned long long)end);
1564 
1565                 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1566                 if (ret)
1567                         mlog_errno(ret);
1568         }
1569         ocfs2_update_inode_fsync_trans(handle, inode, 1);
1570 
1571         ocfs2_commit_trans(osb, handle);
1572 out:
1573         return ret;
1574 }
1575 
1576 static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1577 {
1578         int i;
1579         struct ocfs2_extent_rec *rec = NULL;
1580 
1581         for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1582 
1583                 rec = &el->l_recs[i];
1584 
1585                 if (le32_to_cpu(rec->e_cpos) < pos)
1586                         break;
1587         }
1588 
1589         return i;
1590 }
1591 
1592 /*
1593  * Helper to calculate the punching pos and length in one run, we handle the
1594  * following three cases in order:
1595  *
1596  * - remove the entire record
1597  * - remove a partial record
1598  * - no record needs to be removed (hole-punching completed)
1599 */
1600 static void ocfs2_calc_trunc_pos(struct inode *inode,
1601                                  struct ocfs2_extent_list *el,
1602                                  struct ocfs2_extent_rec *rec,
1603                                  u32 trunc_start, u32 *trunc_cpos,
1604                                  u32 *trunc_len, u32 *trunc_end,
1605                                  u64 *blkno, int *done)
1606 {
1607         int ret = 0;
1608         u32 coff, range;
1609 
1610         range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1611 
1612         if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1613                 /*
1614                  * remove an entire extent record.
1615                  */
1616                 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1617                 /*
1618                  * Skip holes if any.
1619                  */
1620                 if (range < *trunc_end)
1621                         *trunc_end = range;
1622                 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1623                 *blkno = le64_to_cpu(rec->e_blkno);
1624                 *trunc_end = le32_to_cpu(rec->e_cpos);
1625         } else if (range > trunc_start) {
1626                 /*
1627                  * remove a partial extent record, which means we're
1628                  * removing the last extent record.
1629                  */
1630                 *trunc_cpos = trunc_start;
1631                 /*
1632                  * skip hole if any.
1633                  */
1634                 if (range < *trunc_end)
1635                         *trunc_end = range;
1636                 *trunc_len = *trunc_end - trunc_start;
1637                 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1638                 *blkno = le64_to_cpu(rec->e_blkno) +
1639                                 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1640                 *trunc_end = trunc_start;
1641         } else {
1642                 /*
1643                  * It may have two following possibilities:
1644                  *
1645                  * - last record has been removed
1646                  * - trunc_start was within a hole
1647                  *
1648                  * both two cases mean the completion of hole punching.
1649                  */
1650                 ret = 1;
1651         }
1652 
1653         *done = ret;
1654 }
1655 
1656 static int ocfs2_remove_inode_range(struct inode *inode,
1657                                     struct buffer_head *di_bh, u64 byte_start,
1658                                     u64 byte_len)
1659 {
1660         int ret = 0, flags = 0, done = 0, i;
1661         u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1662         u32 cluster_in_el;
1663         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1664         struct ocfs2_cached_dealloc_ctxt dealloc;
1665         struct address_space *mapping = inode->i_mapping;
1666         struct ocfs2_extent_tree et;
1667         struct ocfs2_path *path = NULL;
1668         struct ocfs2_extent_list *el = NULL;
1669         struct ocfs2_extent_rec *rec = NULL;
1670         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1671         u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
1672 
1673         ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
1674         ocfs2_init_dealloc_ctxt(&dealloc);
1675 
1676         trace_ocfs2_remove_inode_range(
1677                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
1678                         (unsigned long long)byte_start,
1679                         (unsigned long long)byte_len);
1680 
1681         if (byte_len == 0)
1682                 return 0;
1683 
1684         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1685                 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
1686                                             byte_start + byte_len, 0);
1687                 if (ret) {
1688                         mlog_errno(ret);
1689                         goto out;
1690                 }
1691                 /*
1692                  * There's no need to get fancy with the page cache
1693                  * truncate of an inline-data inode. We're talking
1694                  * about less than a page here, which will be cached
1695                  * in the dinode buffer anyway.
1696                  */
1697                 unmap_mapping_range(mapping, 0, 0, 0);
1698                 truncate_inode_pages(mapping, 0);
1699                 goto out;
1700         }
1701 
1702         /*
1703          * For reflinks, we may need to CoW 2 clusters which might be
1704          * partially zero'd later, if hole's start and end offset were
1705          * within one cluster(means is not exactly aligned to clustersize).
1706          */
1707 
1708         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1709 
1710                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1711                 if (ret) {
1712                         mlog_errno(ret);
1713                         goto out;
1714                 }
1715 
1716                 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1717                 if (ret) {
1718                         mlog_errno(ret);
1719                         goto out;
1720                 }
1721         }
1722 
1723         trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
1724         trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1725         cluster_in_el = trunc_end;
1726 
1727         ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1728         if (ret) {
1729                 mlog_errno(ret);
1730                 goto out;
1731         }
1732 
1733         path = ocfs2_new_path_from_et(&et);
1734         if (!path) {
1735                 ret = -ENOMEM;
1736                 mlog_errno(ret);
1737                 goto out;
1738         }
1739 
1740         while (trunc_end > trunc_start) {
1741 
1742                 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1743                                       cluster_in_el);
1744                 if (ret) {
1745                         mlog_errno(ret);
1746                         goto out;
1747                 }
1748 
1749                 el = path_leaf_el(path);
1750 
1751                 i = ocfs2_find_rec(el, trunc_end);
1752                 /*
1753                  * Need to go to previous extent block.
1754                  */
1755                 if (i < 0) {
1756                         if (path->p_tree_depth == 0)
1757                                 break;
1758 
1759                         ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1760                                                             path,
1761                                                             &cluster_in_el);
1762                         if (ret) {
1763                                 mlog_errno(ret);
1764                                 goto out;
1765                         }
1766 
1767                         /*
1768                          * We've reached the leftmost extent block,
1769                          * it's safe to leave.
1770                          */
1771                         if (cluster_in_el == 0)
1772                                 break;
1773 
1774                         /*
1775                          * The 'pos' searched for previous extent block is
1776                          * always one cluster less than actual trunc_end.
1777                          */
1778                         trunc_end = cluster_in_el + 1;
1779 
1780                         ocfs2_reinit_path(path, 1);
1781 
1782                         continue;
1783 
1784                 } else
1785                         rec = &el->l_recs[i];
1786 
1787                 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1788                                      &trunc_len, &trunc_end, &blkno, &done);
1789                 if (done)
1790                         break;
1791 
1792                 flags = rec->e_flags;
1793                 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1794 
1795                 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1796                                                phys_cpos, trunc_len, flags,
1797                                                &dealloc, refcount_loc, false);
1798                 if (ret < 0) {
1799                         mlog_errno(ret);
1800                         goto out;
1801                 }
1802 
1803                 cluster_in_el = trunc_end;
1804 
1805                 ocfs2_reinit_path(path, 1);
1806         }
1807 
1808         ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1809 
1810 out:
1811         ocfs2_free_path(path);
1812         ocfs2_schedule_truncate_log_flush(osb, 1);
1813         ocfs2_run_deallocs(osb, &dealloc);
1814 
1815         return ret;
1816 }
1817 
1818 /*
1819  * Parts of this function taken from xfs_change_file_space()
1820  */
1821 static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1822                                      loff_t f_pos, unsigned int cmd,
1823                                      struct ocfs2_space_resv *sr,
1824                                      int change_size)
1825 {
1826         int ret;
1827         s64 llen;
1828         loff_t size;
1829         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1830         struct buffer_head *di_bh = NULL;
1831         handle_t *handle;
1832         unsigned long long max_off = inode->i_sb->s_maxbytes;
1833 
1834         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1835                 return -EROFS;
1836 
1837         inode_lock(inode);
1838 
1839         /*
1840          * This prevents concurrent writes on other nodes
1841          */
1842         ret = ocfs2_rw_lock(inode, 1);
1843         if (ret) {
1844                 mlog_errno(ret);
1845                 goto out;
1846         }
1847 
1848         ret = ocfs2_inode_lock(inode, &di_bh, 1);
1849         if (ret) {
1850                 mlog_errno(ret);
1851                 goto out_rw_unlock;
1852         }
1853 
1854         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1855                 ret = -EPERM;
1856                 goto out_inode_unlock;
1857         }
1858 
1859         switch (sr->l_whence) {
1860         case 0: /*SEEK_SET*/
1861                 break;
1862         case 1: /*SEEK_CUR*/
1863                 sr->l_start += f_pos;
1864                 break;
1865         case 2: /*SEEK_END*/
1866                 sr->l_start += i_size_read(inode);
1867                 break;
1868         default:
1869                 ret = -EINVAL;
1870                 goto out_inode_unlock;
1871         }
1872         sr->l_whence = 0;
1873 
1874         llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1875 
1876         if (sr->l_start < 0
1877             || sr->l_start > max_off
1878             || (sr->l_start + llen) < 0
1879             || (sr->l_start + llen) > max_off) {
1880                 ret = -EINVAL;
1881                 goto out_inode_unlock;
1882         }
1883         size = sr->l_start + sr->l_len;
1884 
1885         if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64 ||
1886             cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) {
1887                 if (sr->l_len <= 0) {
1888                         ret = -EINVAL;
1889                         goto out_inode_unlock;
1890                 }
1891         }
1892 
1893         if (file && should_remove_suid(file->f_path.dentry)) {
1894                 ret = __ocfs2_write_remove_suid(inode, di_bh);
1895                 if (ret) {
1896                         mlog_errno(ret);
1897                         goto out_inode_unlock;
1898                 }
1899         }
1900 
1901         down_write(&OCFS2_I(inode)->ip_alloc_sem);
1902         switch (cmd) {
1903         case OCFS2_IOC_RESVSP:
1904         case OCFS2_IOC_RESVSP64:
1905                 /*
1906                  * This takes unsigned offsets, but the signed ones we
1907                  * pass have been checked against overflow above.
1908                  */
1909                 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1910                                                        sr->l_len);
1911                 break;
1912         case OCFS2_IOC_UNRESVSP:
1913         case OCFS2_IOC_UNRESVSP64:
1914                 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1915                                                sr->l_len);
1916                 break;
1917         default:
1918                 ret = -EINVAL;
1919         }
1920         up_write(&OCFS2_I(inode)->ip_alloc_sem);
1921         if (ret) {
1922                 mlog_errno(ret);
1923                 goto out_inode_unlock;
1924         }
1925 
1926         /*
1927          * We update c/mtime for these changes
1928          */
1929         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1930         if (IS_ERR(handle)) {
1931                 ret = PTR_ERR(handle);
1932                 mlog_errno(ret);
1933                 goto out_inode_unlock;
1934         }
1935 
1936         if (change_size && i_size_read(inode) < size)
1937                 i_size_write(inode, size);
1938 
1939         inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1940         ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1941         if (ret < 0)
1942                 mlog_errno(ret);
1943 
1944         if (file && (file->f_flags & O_SYNC))
1945                 handle->h_sync = 1;
1946 
1947         ocfs2_commit_trans(osb, handle);
1948 
1949 out_inode_unlock:
1950         brelse(di_bh);
1951         ocfs2_inode_unlock(inode, 1);
1952 out_rw_unlock:
1953         ocfs2_rw_unlock(inode, 1);
1954 
1955 out:
1956         inode_unlock(inode);
1957         return ret;
1958 }
1959 
1960 int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1961                             struct ocfs2_space_resv *sr)
1962 {
1963         struct inode *inode = file_inode(file);
1964         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1965         int ret;
1966 
1967         if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1968             !ocfs2_writes_unwritten_extents(osb))
1969                 return -ENOTTY;
1970         else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1971                  !ocfs2_sparse_alloc(osb))
1972                 return -ENOTTY;
1973 
1974         if (!S_ISREG(inode->i_mode))
1975                 return -EINVAL;
1976 
1977         if (!(file->f_mode & FMODE_WRITE))
1978                 return -EBADF;
1979 
1980         ret = mnt_want_write_file(file);
1981         if (ret)
1982                 return ret;
1983         ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1984         mnt_drop_write_file(file);
1985         return ret;
1986 }
1987 
1988 static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
1989                             loff_t len)
1990 {
1991         struct inode *inode = file_inode(file);
1992         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1993         struct ocfs2_space_resv sr;
1994         int change_size = 1;
1995         int cmd = OCFS2_IOC_RESVSP64;
1996 
1997         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1998                 return -EOPNOTSUPP;
1999         if (!ocfs2_writes_unwritten_extents(osb))
2000                 return -EOPNOTSUPP;
2001 
2002         if (mode & FALLOC_FL_KEEP_SIZE)
2003                 change_size = 0;
2004 
2005         if (mode & FALLOC_FL_PUNCH_HOLE)
2006                 cmd = OCFS2_IOC_UNRESVSP64;
2007 
2008         sr.l_whence = 0;
2009         sr.l_start = (s64)offset;
2010         sr.l_len = (s64)len;
2011 
2012         return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2013                                          change_size);
2014 }
2015 
2016 int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2017                                    size_t count)
2018 {
2019         int ret = 0;
2020         unsigned int extent_flags;
2021         u32 cpos, clusters, extent_len, phys_cpos;
2022         struct super_block *sb = inode->i_sb;
2023 
2024         if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
2025             !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2026             OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2027                 return 0;
2028 
2029         cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2030         clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2031 
2032         while (clusters) {
2033                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2034                                          &extent_flags);
2035                 if (ret < 0) {
2036                         mlog_errno(ret);
2037                         goto out;
2038                 }
2039 
2040                 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2041                         ret = 1;
2042                         break;
2043                 }
2044 
2045                 if (extent_len > clusters)
2046                         extent_len = clusters;
2047 
2048                 clusters -= extent_len;
2049                 cpos += extent_len;
2050         }
2051 out:
2052         return ret;
2053 }
2054 
2055 static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
2056 {
2057         int blockmask = inode->i_sb->s_blocksize - 1;
2058         loff_t final_size = pos + count;
2059 
2060         if ((pos & blockmask) || (final_size & blockmask))
2061                 return 1;
2062         return 0;
2063 }
2064 
2065 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
2066                                             struct file *file,
2067                                             loff_t pos, size_t count,
2068                                             int *meta_level)
2069 {
2070         int ret;
2071         struct buffer_head *di_bh = NULL;
2072         u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2073         u32 clusters =
2074                 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2075 
2076         ret = ocfs2_inode_lock(inode, &di_bh, 1);
2077         if (ret) {
2078                 mlog_errno(ret);
2079                 goto out;
2080         }
2081 
2082         *meta_level = 1;
2083 
2084         ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
2085         if (ret)
2086                 mlog_errno(ret);
2087 out:
2088         brelse(di_bh);
2089         return ret;
2090 }
2091 
2092 static int ocfs2_prepare_inode_for_write(struct file *file,
2093                                          loff_t pos,
2094                                          size_t count)
2095 {
2096         int ret = 0, meta_level = 0;
2097         struct dentry *dentry = file->f_path.dentry;
2098         struct inode *inode = d_inode(dentry);
2099         loff_t end;
2100 
2101         /*
2102          * We start with a read level meta lock and only jump to an ex
2103          * if we need to make modifications here.
2104          */
2105         for(;;) {
2106                 ret = ocfs2_inode_lock(inode, NULL, meta_level);
2107                 if (ret < 0) {
2108                         meta_level = -1;
2109                         mlog_errno(ret);
2110                         goto out;
2111                 }
2112 
2113                 /* Clear suid / sgid if necessary. We do this here
2114                  * instead of later in the write path because
2115                  * remove_suid() calls ->setattr without any hint that
2116                  * we may have already done our cluster locking. Since
2117                  * ocfs2_setattr() *must* take cluster locks to
2118                  * proceed, this will lead us to recursively lock the
2119                  * inode. There's also the dinode i_size state which
2120                  * can be lost via setattr during extending writes (we
2121                  * set inode->i_size at the end of a write. */
2122                 if (should_remove_suid(dentry)) {
2123                         if (meta_level == 0) {
2124                                 ocfs2_inode_unlock(inode, meta_level);
2125                                 meta_level = 1;
2126                                 continue;
2127                         }
2128 
2129                         ret = ocfs2_write_remove_suid(inode);
2130                         if (ret < 0) {
2131                                 mlog_errno(ret);
2132                                 goto out_unlock;
2133                         }
2134                 }
2135 
2136                 end = pos + count;
2137 
2138                 ret = ocfs2_check_range_for_refcount(inode, pos, count);
2139                 if (ret == 1) {
2140                         ocfs2_inode_unlock(inode, meta_level);
2141                         meta_level = -1;
2142 
2143                         ret = ocfs2_prepare_inode_for_refcount(inode,
2144                                                                file,
2145                                                                pos,
2146                                                                count,
2147                                                                &meta_level);
2148                 }
2149 
2150                 if (ret < 0) {
2151                         mlog_errno(ret);
2152                         goto out_unlock;
2153                 }
2154 
2155                 break;
2156         }
2157 
2158 out_unlock:
2159         trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
2160                                             pos, count);
2161 
2162         if (meta_level >= 0)
2163                 ocfs2_inode_unlock(inode, meta_level);
2164 
2165 out:
2166         return ret;
2167 }
2168 
2169 static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
2170                                     struct iov_iter *from)
2171 {
2172         int direct_io, rw_level;
2173         ssize_t written = 0;
2174         ssize_t ret;
2175         size_t count = iov_iter_count(from);
2176         struct file *file = iocb->ki_filp;
2177         struct inode *inode = file_inode(file);
2178         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2179         int full_coherency = !(osb->s_mount_opt &
2180                                OCFS2_MOUNT_COHERENCY_BUFFERED);
2181         void *saved_ki_complete = NULL;
2182         int append_write = ((iocb->ki_pos + count) >=
2183                         i_size_read(inode) ? 1 : 0);
2184 
2185         trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
2186                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
2187                 file->f_path.dentry->d_name.len,
2188                 file->f_path.dentry->d_name.name,
2189                 (unsigned int)from->nr_segs);   /* GRRRRR */
2190 
2191         if (count == 0)
2192                 return 0;
2193 
2194         direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
2195 
2196         inode_lock(inode);
2197 
2198         /*
2199          * Concurrent O_DIRECT writes are allowed with
2200          * mount_option "coherency=buffered".
2201          * For append write, we must take rw EX.
2202          */
2203         rw_level = (!direct_io || full_coherency || append_write);
2204 
2205         ret = ocfs2_rw_lock(inode, rw_level);
2206         if (ret < 0) {
2207                 mlog_errno(ret);
2208                 goto out_mutex;
2209         }
2210 
2211         /*
2212          * O_DIRECT writes with "coherency=full" need to take EX cluster
2213          * inode_lock to guarantee coherency.
2214          */
2215         if (direct_io && full_coherency) {
2216                 /*
2217                  * We need to take and drop the inode lock to force
2218                  * other nodes to drop their caches.  Buffered I/O
2219                  * already does this in write_begin().
2220                  */
2221                 ret = ocfs2_inode_lock(inode, NULL, 1);
2222                 if (ret < 0) {
2223                         mlog_errno(ret);
2224                         goto out;
2225                 }
2226 
2227                 ocfs2_inode_unlock(inode, 1);
2228         }
2229 
2230         ret = generic_write_checks(iocb, from);
2231         if (ret <= 0) {
2232                 if (ret)
2233                         mlog_errno(ret);
2234                 goto out;
2235         }
2236         count = ret;
2237 
2238         ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count);
2239         if (ret < 0) {
2240                 mlog_errno(ret);
2241                 goto out;
2242         }
2243 
2244         if (direct_io && !is_sync_kiocb(iocb) &&
2245             ocfs2_is_io_unaligned(inode, count, iocb->ki_pos)) {
2246                 /*
2247                  * Make it a sync io if it's an unaligned aio.
2248                  */
2249                 saved_ki_complete = xchg(&iocb->ki_complete, NULL);
2250         }
2251 
2252         /* communicate with ocfs2_dio_end_io */
2253         ocfs2_iocb_set_rw_locked(iocb, rw_level);
2254 
2255         written = __generic_file_write_iter(iocb, from);
2256         /* buffered aio wouldn't have proper lock coverage today */
2257         BUG_ON(written == -EIOCBQUEUED && !(iocb->ki_flags & IOCB_DIRECT));
2258 
2259         /*
2260          * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2261          * function pointer which is called when o_direct io completes so that
2262          * it can unlock our rw lock.
2263          * Unfortunately there are error cases which call end_io and others
2264          * that don't.  so we don't have to unlock the rw_lock if either an
2265          * async dio is going to do it in the future or an end_io after an
2266          * error has already done it.
2267          */
2268         if ((written == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
2269                 rw_level = -1;
2270         }
2271 
2272         if (unlikely(written <= 0))
2273                 goto out;
2274 
2275         if (((file->f_flags & O_DSYNC) && !direct_io) ||
2276             IS_SYNC(inode)) {
2277                 ret = filemap_fdatawrite_range(file->f_mapping,
2278                                                iocb->ki_pos - written,
2279                                                iocb->ki_pos - 1);
2280                 if (ret < 0)
2281                         written = ret;
2282 
2283                 if (!ret) {
2284                         ret = jbd2_journal_force_commit(osb->journal->j_journal);
2285                         if (ret < 0)
2286                                 written = ret;
2287                 }
2288 
2289                 if (!ret)
2290                         ret = filemap_fdatawait_range(file->f_mapping,
2291                                                       iocb->ki_pos - written,
2292                                                       iocb->ki_pos - 1);
2293         }
2294 
2295 out:
2296         if (saved_ki_complete)
2297                 xchg(&iocb->ki_complete, saved_ki_complete);
2298 
2299         if (rw_level != -1)
2300                 ocfs2_rw_unlock(inode, rw_level);
2301 
2302 out_mutex:
2303         inode_unlock(inode);
2304 
2305         if (written)
2306                 ret = written;
2307         return ret;
2308 }
2309 
2310 static ssize_t ocfs2_file_splice_read(struct file *in,
2311                                       loff_t *ppos,
2312                                       struct pipe_inode_info *pipe,
2313                                       size_t len,
2314                                       unsigned int flags)
2315 {
2316         int ret = 0, lock_level = 0;
2317         struct inode *inode = file_inode(in);
2318 
2319         trace_ocfs2_file_splice_read(inode, in, in->f_path.dentry,
2320                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2321                         in->f_path.dentry->d_name.len,
2322                         in->f_path.dentry->d_name.name, len);
2323 
2324         /*
2325          * See the comment in ocfs2_file_read_iter()
2326          */
2327         ret = ocfs2_inode_lock_atime(inode, in->f_path.mnt, &lock_level);
2328         if (ret < 0) {
2329                 mlog_errno(ret);
2330                 goto bail;
2331         }
2332         ocfs2_inode_unlock(inode, lock_level);
2333 
2334         ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2335 
2336 bail:
2337         return ret;
2338 }
2339 
2340 static ssize_t ocfs2_file_read_iter(struct kiocb *iocb,
2341                                    struct iov_iter *to)
2342 {
2343         int ret = 0, rw_level = -1, lock_level = 0;
2344         struct file *filp = iocb->ki_filp;
2345         struct inode *inode = file_inode(filp);
2346 
2347         trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry,
2348                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
2349                         filp->f_path.dentry->d_name.len,
2350                         filp->f_path.dentry->d_name.name,
2351                         to->nr_segs);   /* GRRRRR */
2352 
2353 
2354         if (!inode) {
2355                 ret = -EINVAL;
2356                 mlog_errno(ret);
2357                 goto bail;
2358         }
2359 
2360         /*
2361          * buffered reads protect themselves in ->readpage().  O_DIRECT reads
2362          * need locks to protect pending reads from racing with truncate.
2363          */
2364         if (iocb->ki_flags & IOCB_DIRECT) {
2365                 ret = ocfs2_rw_lock(inode, 0);
2366                 if (ret < 0) {
2367                         mlog_errno(ret);
2368                         goto bail;
2369                 }
2370                 rw_level = 0;
2371                 /* communicate with ocfs2_dio_end_io */
2372                 ocfs2_iocb_set_rw_locked(iocb, rw_level);
2373         }
2374 
2375         /*
2376          * We're fine letting folks race truncates and extending
2377          * writes with read across the cluster, just like they can
2378          * locally. Hence no rw_lock during read.
2379          *
2380          * Take and drop the meta data lock to update inode fields
2381          * like i_size. This allows the checks down below
2382          * generic_file_aio_read() a chance of actually working.
2383          */
2384         ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level);
2385         if (ret < 0) {
2386                 mlog_errno(ret);
2387                 goto bail;
2388         }
2389         ocfs2_inode_unlock(inode, lock_level);
2390 
2391         ret = generic_file_read_iter(iocb, to);
2392         trace_generic_file_aio_read_ret(ret);
2393 
2394         /* buffered aio wouldn't have proper lock coverage today */
2395         BUG_ON(ret == -EIOCBQUEUED && !(iocb->ki_flags & IOCB_DIRECT));
2396 
2397         /* see ocfs2_file_write_iter */
2398         if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2399                 rw_level = -1;
2400         }
2401 
2402 bail:
2403         if (rw_level != -1)
2404                 ocfs2_rw_unlock(inode, rw_level);
2405 
2406         return ret;
2407 }
2408 
2409 /* Refer generic_file_llseek_unlocked() */
2410 static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
2411 {
2412         struct inode *inode = file->f_mapping->host;
2413         int ret = 0;
2414 
2415         inode_lock(inode);
2416 
2417         switch (whence) {
2418         case SEEK_SET:
2419                 break;
2420         case SEEK_END:
2421                 /* SEEK_END requires the OCFS2 inode lock for the file
2422                  * because it references the file's size.
2423                  */
2424                 ret = ocfs2_inode_lock(inode, NULL, 0);
2425                 if (ret < 0) {
2426                         mlog_errno(ret);
2427                         goto out;
2428                 }
2429                 offset += i_size_read(inode);
2430                 ocfs2_inode_unlock(inode, 0);
2431                 break;
2432         case SEEK_CUR:
2433                 if (offset == 0) {
2434                         offset = file->f_pos;
2435                         goto out;
2436                 }
2437                 offset += file->f_pos;
2438                 break;
2439         case SEEK_DATA:
2440         case SEEK_HOLE:
2441                 ret = ocfs2_seek_data_hole_offset(file, &offset, whence);
2442                 if (ret)
2443                         goto out;
2444                 break;
2445         default:
2446                 ret = -EINVAL;
2447                 goto out;
2448         }
2449 
2450         offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
2451 
2452 out:
2453         inode_unlock(inode);
2454         if (ret)
2455                 return ret;
2456         return offset;
2457 }
2458 
2459 const struct inode_operations ocfs2_file_iops = {
2460         .setattr        = ocfs2_setattr,
2461         .getattr        = ocfs2_getattr,
2462         .permission     = ocfs2_permission,
2463         .setxattr       = generic_setxattr,
2464         .getxattr       = generic_getxattr,
2465         .listxattr      = ocfs2_listxattr,
2466         .removexattr    = generic_removexattr,
2467         .fiemap         = ocfs2_fiemap,
2468         .get_acl        = ocfs2_iop_get_acl,
2469         .set_acl        = ocfs2_iop_set_acl,
2470 };
2471 
2472 const struct inode_operations ocfs2_special_file_iops = {
2473         .setattr        = ocfs2_setattr,
2474         .getattr        = ocfs2_getattr,
2475         .permission     = ocfs2_permission,
2476         .get_acl        = ocfs2_iop_get_acl,
2477         .set_acl        = ocfs2_iop_set_acl,
2478 };
2479 
2480 /*
2481  * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2482  * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2483  */
2484 const struct file_operations ocfs2_fops = {
2485         .llseek         = ocfs2_file_llseek,
2486         .mmap           = ocfs2_mmap,
2487         .fsync          = ocfs2_sync_file,
2488         .release        = ocfs2_file_release,
2489         .open           = ocfs2_file_open,
2490         .read_iter      = ocfs2_file_read_iter,
2491         .write_iter     = ocfs2_file_write_iter,
2492         .unlocked_ioctl = ocfs2_ioctl,
2493 #ifdef CONFIG_COMPAT
2494         .compat_ioctl   = ocfs2_compat_ioctl,
2495 #endif
2496         .lock           = ocfs2_lock,
2497         .flock          = ocfs2_flock,
2498         .splice_read    = ocfs2_file_splice_read,
2499         .splice_write   = iter_file_splice_write,
2500         .fallocate      = ocfs2_fallocate,
2501 };
2502 
2503 const struct file_operations ocfs2_dops = {
2504         .llseek         = generic_file_llseek,
2505         .read           = generic_read_dir,
2506         .iterate        = ocfs2_readdir,
2507         .fsync          = ocfs2_sync_file,
2508         .release        = ocfs2_dir_release,
2509         .open           = ocfs2_dir_open,
2510         .unlocked_ioctl = ocfs2_ioctl,
2511 #ifdef CONFIG_COMPAT
2512         .compat_ioctl   = ocfs2_compat_ioctl,
2513 #endif
2514         .lock           = ocfs2_lock,
2515         .flock          = ocfs2_flock,
2516 };
2517 
2518 /*
2519  * POSIX-lockless variants of our file_operations.
2520  *
2521  * These will be used if the underlying cluster stack does not support
2522  * posix file locking, if the user passes the "localflocks" mount
2523  * option, or if we have a local-only fs.
2524  *
2525  * ocfs2_flock is in here because all stacks handle UNIX file locks,
2526  * so we still want it in the case of no stack support for
2527  * plocks. Internally, it will do the right thing when asked to ignore
2528  * the cluster.
2529  */
2530 const struct file_operations ocfs2_fops_no_plocks = {
2531         .llseek         = ocfs2_file_llseek,
2532         .mmap           = ocfs2_mmap,
2533         .fsync          = ocfs2_sync_file,
2534         .release        = ocfs2_file_release,
2535         .open           = ocfs2_file_open,
2536         .read_iter      = ocfs2_file_read_iter,
2537         .write_iter     = ocfs2_file_write_iter,
2538         .unlocked_ioctl = ocfs2_ioctl,
2539 #ifdef CONFIG_COMPAT
2540         .compat_ioctl   = ocfs2_compat_ioctl,
2541 #endif
2542         .flock          = ocfs2_flock,
2543         .splice_read    = ocfs2_file_splice_read,
2544         .splice_write   = iter_file_splice_write,
2545         .fallocate      = ocfs2_fallocate,
2546 };
2547 
2548 const struct file_operations ocfs2_dops_no_plocks = {
2549         .llseek         = generic_file_llseek,
2550         .read           = generic_read_dir,
2551         .iterate        = ocfs2_readdir,
2552         .fsync          = ocfs2_sync_file,
2553         .release        = ocfs2_dir_release,
2554         .open           = ocfs2_dir_open,
2555         .unlocked_ioctl = ocfs2_ioctl,
2556 #ifdef CONFIG_COMPAT
2557         .compat_ioctl   = ocfs2_compat_ioctl,
2558 #endif
2559         .flock          = ocfs2_flock,
2560 };
2561 

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