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

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * inode.c
  5  *
  6  * vfs' aops, fops, dops and iops
  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/fs.h>
 27 #include <linux/types.h>
 28 #include <linux/highmem.h>
 29 #include <linux/pagemap.h>
 30 #include <linux/quotaops.h>
 31 
 32 #include <asm/byteorder.h>
 33 
 34 #include <cluster/masklog.h>
 35 
 36 #include "ocfs2.h"
 37 
 38 #include "alloc.h"
 39 #include "dir.h"
 40 #include "blockcheck.h"
 41 #include "dlmglue.h"
 42 #include "extent_map.h"
 43 #include "file.h"
 44 #include "heartbeat.h"
 45 #include "inode.h"
 46 #include "journal.h"
 47 #include "namei.h"
 48 #include "suballoc.h"
 49 #include "super.h"
 50 #include "symlink.h"
 51 #include "sysfile.h"
 52 #include "uptodate.h"
 53 #include "xattr.h"
 54 #include "refcounttree.h"
 55 #include "ocfs2_trace.h"
 56 #include "filecheck.h"
 57 
 58 #include "buffer_head_io.h"
 59 
 60 struct ocfs2_find_inode_args
 61 {
 62         u64             fi_blkno;
 63         unsigned long   fi_ino;
 64         unsigned int    fi_flags;
 65         unsigned int    fi_sysfile_type;
 66 };
 67 
 68 static struct lock_class_key ocfs2_sysfile_lock_key[NUM_SYSTEM_INODES];
 69 
 70 static int ocfs2_read_locked_inode(struct inode *inode,
 71                                    struct ocfs2_find_inode_args *args);
 72 static int ocfs2_init_locked_inode(struct inode *inode, void *opaque);
 73 static int ocfs2_find_actor(struct inode *inode, void *opaque);
 74 static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
 75                                     struct inode *inode,
 76                                     struct buffer_head *fe_bh);
 77 
 78 static int ocfs2_filecheck_read_inode_block_full(struct inode *inode,
 79                                                  struct buffer_head **bh,
 80                                                  int flags, int type);
 81 static int ocfs2_filecheck_validate_inode_block(struct super_block *sb,
 82                                                 struct buffer_head *bh);
 83 static int ocfs2_filecheck_repair_inode_block(struct super_block *sb,
 84                                               struct buffer_head *bh);
 85 
 86 void ocfs2_set_inode_flags(struct inode *inode)
 87 {
 88         unsigned int flags = OCFS2_I(inode)->ip_attr;
 89 
 90         inode->i_flags &= ~(S_IMMUTABLE |
 91                 S_SYNC | S_APPEND | S_NOATIME | S_DIRSYNC);
 92 
 93         if (flags & OCFS2_IMMUTABLE_FL)
 94                 inode->i_flags |= S_IMMUTABLE;
 95 
 96         if (flags & OCFS2_SYNC_FL)
 97                 inode->i_flags |= S_SYNC;
 98         if (flags & OCFS2_APPEND_FL)
 99                 inode->i_flags |= S_APPEND;
100         if (flags & OCFS2_NOATIME_FL)
101                 inode->i_flags |= S_NOATIME;
102         if (flags & OCFS2_DIRSYNC_FL)
103                 inode->i_flags |= S_DIRSYNC;
104 }
105 
106 /* Propagate flags from i_flags to OCFS2_I(inode)->ip_attr */
107 void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi)
108 {
109         unsigned int flags = oi->vfs_inode.i_flags;
110 
111         oi->ip_attr &= ~(OCFS2_SYNC_FL|OCFS2_APPEND_FL|
112                         OCFS2_IMMUTABLE_FL|OCFS2_NOATIME_FL|OCFS2_DIRSYNC_FL);
113         if (flags & S_SYNC)
114                 oi->ip_attr |= OCFS2_SYNC_FL;
115         if (flags & S_APPEND)
116                 oi->ip_attr |= OCFS2_APPEND_FL;
117         if (flags & S_IMMUTABLE)
118                 oi->ip_attr |= OCFS2_IMMUTABLE_FL;
119         if (flags & S_NOATIME)
120                 oi->ip_attr |= OCFS2_NOATIME_FL;
121         if (flags & S_DIRSYNC)
122                 oi->ip_attr |= OCFS2_DIRSYNC_FL;
123 }
124 
125 struct inode *ocfs2_ilookup(struct super_block *sb, u64 blkno)
126 {
127         struct ocfs2_find_inode_args args;
128 
129         args.fi_blkno = blkno;
130         args.fi_flags = 0;
131         args.fi_ino = ino_from_blkno(sb, blkno);
132         args.fi_sysfile_type = 0;
133 
134         return ilookup5(sb, blkno, ocfs2_find_actor, &args);
135 }
136 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
137                          int sysfile_type)
138 {
139         int rc = 0;
140         struct inode *inode = NULL;
141         struct super_block *sb = osb->sb;
142         struct ocfs2_find_inode_args args;
143         journal_t *journal = OCFS2_SB(sb)->journal->j_journal;
144 
145         trace_ocfs2_iget_begin((unsigned long long)blkno, flags,
146                                sysfile_type);
147 
148         /* Ok. By now we've either got the offsets passed to us by the
149          * caller, or we just pulled them off the bh. Lets do some
150          * sanity checks to make sure they're OK. */
151         if (blkno == 0) {
152                 inode = ERR_PTR(-EINVAL);
153                 mlog_errno(PTR_ERR(inode));
154                 goto bail;
155         }
156 
157         args.fi_blkno = blkno;
158         args.fi_flags = flags;
159         args.fi_ino = ino_from_blkno(sb, blkno);
160         args.fi_sysfile_type = sysfile_type;
161 
162         inode = iget5_locked(sb, args.fi_ino, ocfs2_find_actor,
163                              ocfs2_init_locked_inode, &args);
164         /* inode was *not* in the inode cache. 2.6.x requires
165          * us to do our own read_inode call and unlock it
166          * afterwards. */
167         if (inode == NULL) {
168                 inode = ERR_PTR(-ENOMEM);
169                 mlog_errno(PTR_ERR(inode));
170                 goto bail;
171         }
172         trace_ocfs2_iget5_locked(inode->i_state);
173         if (inode->i_state & I_NEW) {
174                 rc = ocfs2_read_locked_inode(inode, &args);
175                 unlock_new_inode(inode);
176         }
177         if (is_bad_inode(inode)) {
178                 iput(inode);
179                 if ((flags & OCFS2_FI_FLAG_FILECHECK_CHK) ||
180                     (flags & OCFS2_FI_FLAG_FILECHECK_FIX))
181                         /* Return OCFS2_FILECHECK_ERR_XXX related errno */
182                         inode = ERR_PTR(rc);
183                 else
184                         inode = ERR_PTR(-ESTALE);
185                 goto bail;
186         }
187 
188         /*
189          * Set transaction id's of transactions that have to be committed
190          * to finish f[data]sync. We set them to currently running transaction
191          * as we cannot be sure that the inode or some of its metadata isn't
192          * part of the transaction - the inode could have been reclaimed and
193          * now it is reread from disk.
194          */
195         if (journal) {
196                 transaction_t *transaction;
197                 tid_t tid;
198                 struct ocfs2_inode_info *oi = OCFS2_I(inode);
199 
200                 read_lock(&journal->j_state_lock);
201                 if (journal->j_running_transaction)
202                         transaction = journal->j_running_transaction;
203                 else
204                         transaction = journal->j_committing_transaction;
205                 if (transaction)
206                         tid = transaction->t_tid;
207                 else
208                         tid = journal->j_commit_sequence;
209                 read_unlock(&journal->j_state_lock);
210                 oi->i_sync_tid = tid;
211                 oi->i_datasync_tid = tid;
212         }
213 
214 bail:
215         if (!IS_ERR(inode)) {
216                 trace_ocfs2_iget_end(inode, 
217                         (unsigned long long)OCFS2_I(inode)->ip_blkno);
218         }
219 
220         return inode;
221 }
222 
223 
224 /*
225  * here's how inodes get read from disk:
226  * iget5_locked -> find_actor -> OCFS2_FIND_ACTOR
227  * found? : return the in-memory inode
228  * not found? : get_new_inode -> OCFS2_INIT_LOCKED_INODE
229  */
230 
231 static int ocfs2_find_actor(struct inode *inode, void *opaque)
232 {
233         struct ocfs2_find_inode_args *args = NULL;
234         struct ocfs2_inode_info *oi = OCFS2_I(inode);
235         int ret = 0;
236 
237         args = opaque;
238 
239         mlog_bug_on_msg(!inode, "No inode in find actor!\n");
240 
241         trace_ocfs2_find_actor(inode, inode->i_ino, opaque, args->fi_blkno);
242 
243         if (oi->ip_blkno != args->fi_blkno)
244                 goto bail;
245 
246         ret = 1;
247 bail:
248         return ret;
249 }
250 
251 /*
252  * initialize the new inode, but don't do anything that would cause
253  * us to sleep.
254  * return 0 on success, 1 on failure
255  */
256 static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
257 {
258         struct ocfs2_find_inode_args *args = opaque;
259         static struct lock_class_key ocfs2_quota_ip_alloc_sem_key,
260                                      ocfs2_file_ip_alloc_sem_key;
261 
262         inode->i_ino = args->fi_ino;
263         OCFS2_I(inode)->ip_blkno = args->fi_blkno;
264         if (args->fi_sysfile_type != 0)
265                 lockdep_set_class(&inode->i_mutex,
266                         &ocfs2_sysfile_lock_key[args->fi_sysfile_type]);
267         if (args->fi_sysfile_type == USER_QUOTA_SYSTEM_INODE ||
268             args->fi_sysfile_type == GROUP_QUOTA_SYSTEM_INODE ||
269             args->fi_sysfile_type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
270             args->fi_sysfile_type == LOCAL_GROUP_QUOTA_SYSTEM_INODE)
271                 lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
272                                   &ocfs2_quota_ip_alloc_sem_key);
273         else
274                 lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
275                                   &ocfs2_file_ip_alloc_sem_key);
276 
277         return 0;
278 }
279 
280 void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
281                           int create_ino)
282 {
283         struct super_block *sb;
284         struct ocfs2_super *osb;
285         int use_plocks = 1;
286 
287         sb = inode->i_sb;
288         osb = OCFS2_SB(sb);
289 
290         if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
291             ocfs2_mount_local(osb) || !ocfs2_stack_supports_plocks())
292                 use_plocks = 0;
293 
294         /*
295          * These have all been checked by ocfs2_read_inode_block() or set
296          * by ocfs2_mknod_locked(), so a failure is a code bug.
297          */
298         BUG_ON(!OCFS2_IS_VALID_DINODE(fe));  /* This means that read_inode
299                                                 cannot create a superblock
300                                                 inode today.  change if
301                                                 that is needed. */
302         BUG_ON(!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)));
303         BUG_ON(le32_to_cpu(fe->i_fs_generation) != osb->fs_generation);
304 
305 
306         OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
307         OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
308         OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
309 
310         inode->i_version = 1;
311         inode->i_generation = le32_to_cpu(fe->i_generation);
312         inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
313         inode->i_mode = le16_to_cpu(fe->i_mode);
314         i_uid_write(inode, le32_to_cpu(fe->i_uid));
315         i_gid_write(inode, le32_to_cpu(fe->i_gid));
316 
317         /* Fast symlinks will have i_size but no allocated clusters. */
318         if (S_ISLNK(inode->i_mode) && !fe->i_clusters) {
319                 inode->i_blocks = 0;
320                 inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
321         } else {
322                 inode->i_blocks = ocfs2_inode_sector_count(inode);
323                 inode->i_mapping->a_ops = &ocfs2_aops;
324         }
325         inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
326         inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
327         inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
328         inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
329         inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
330         inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
331 
332         if (OCFS2_I(inode)->ip_blkno != le64_to_cpu(fe->i_blkno))
333                 mlog(ML_ERROR,
334                      "ip_blkno %llu != i_blkno %llu!\n",
335                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
336                      (unsigned long long)le64_to_cpu(fe->i_blkno));
337 
338         set_nlink(inode, ocfs2_read_links_count(fe));
339 
340         trace_ocfs2_populate_inode(OCFS2_I(inode)->ip_blkno,
341                                    le32_to_cpu(fe->i_flags));
342         if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) {
343                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE;
344                 inode->i_flags |= S_NOQUOTA;
345         }
346   
347         if (fe->i_flags & cpu_to_le32(OCFS2_LOCAL_ALLOC_FL)) {
348                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
349         } else if (fe->i_flags & cpu_to_le32(OCFS2_BITMAP_FL)) {
350                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
351         } else if (fe->i_flags & cpu_to_le32(OCFS2_QUOTA_FL)) {
352                 inode->i_flags |= S_NOQUOTA;
353         } else if (fe->i_flags & cpu_to_le32(OCFS2_SUPER_BLOCK_FL)) {
354                 /* we can't actually hit this as read_inode can't
355                  * handle superblocks today ;-) */
356                 BUG();
357         }
358 
359         switch (inode->i_mode & S_IFMT) {
360             case S_IFREG:
361                     if (use_plocks)
362                             inode->i_fop = &ocfs2_fops;
363                     else
364                             inode->i_fop = &ocfs2_fops_no_plocks;
365                     inode->i_op = &ocfs2_file_iops;
366                     i_size_write(inode, le64_to_cpu(fe->i_size));
367                     break;
368             case S_IFDIR:
369                     inode->i_op = &ocfs2_dir_iops;
370                     if (use_plocks)
371                             inode->i_fop = &ocfs2_dops;
372                     else
373                             inode->i_fop = &ocfs2_dops_no_plocks;
374                     i_size_write(inode, le64_to_cpu(fe->i_size));
375                     OCFS2_I(inode)->ip_dir_lock_gen = 1;
376                     break;
377             case S_IFLNK:
378                     inode->i_op = &ocfs2_symlink_inode_operations;
379                     inode_nohighmem(inode);
380                     i_size_write(inode, le64_to_cpu(fe->i_size));
381                     break;
382             default:
383                     inode->i_op = &ocfs2_special_file_iops;
384                     init_special_inode(inode, inode->i_mode,
385                                        inode->i_rdev);
386                     break;
387         }
388 
389         if (create_ino) {
390                 inode->i_ino = ino_from_blkno(inode->i_sb,
391                                le64_to_cpu(fe->i_blkno));
392 
393                 /*
394                  * If we ever want to create system files from kernel,
395                  * the generation argument to
396                  * ocfs2_inode_lock_res_init() will have to change.
397                  */
398                 BUG_ON(le32_to_cpu(fe->i_flags) & OCFS2_SYSTEM_FL);
399 
400                 ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,
401                                           OCFS2_LOCK_TYPE_META, 0, inode);
402 
403                 ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
404                                           OCFS2_LOCK_TYPE_OPEN, 0, inode);
405         }
406 
407         ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_rw_lockres,
408                                   OCFS2_LOCK_TYPE_RW, inode->i_generation,
409                                   inode);
410 
411         ocfs2_set_inode_flags(inode);
412 
413         OCFS2_I(inode)->ip_last_used_slot = 0;
414         OCFS2_I(inode)->ip_last_used_group = 0;
415 
416         if (S_ISDIR(inode->i_mode))
417                 ocfs2_resv_set_type(&OCFS2_I(inode)->ip_la_data_resv,
418                                     OCFS2_RESV_FLAG_DIR);
419 }
420 
421 static int ocfs2_read_locked_inode(struct inode *inode,
422                                    struct ocfs2_find_inode_args *args)
423 {
424         struct super_block *sb;
425         struct ocfs2_super *osb;
426         struct ocfs2_dinode *fe;
427         struct buffer_head *bh = NULL;
428         int status, can_lock, lock_level = 0;
429         u32 generation = 0;
430 
431         status = -EINVAL;
432         sb = inode->i_sb;
433         osb = OCFS2_SB(sb);
434 
435         /*
436          * To improve performance of cold-cache inode stats, we take
437          * the cluster lock here if possible.
438          *
439          * Generally, OCFS2 never trusts the contents of an inode
440          * unless it's holding a cluster lock, so taking it here isn't
441          * a correctness issue as much as it is a performance
442          * improvement.
443          *
444          * There are three times when taking the lock is not a good idea:
445          *
446          * 1) During startup, before we have initialized the DLM.
447          *
448          * 2) If we are reading certain system files which never get
449          *    cluster locks (local alloc, truncate log).
450          *
451          * 3) If the process doing the iget() is responsible for
452          *    orphan dir recovery. We're holding the orphan dir lock and
453          *    can get into a deadlock with another process on another
454          *    node in ->delete_inode().
455          *
456          * #1 and #2 can be simply solved by never taking the lock
457          * here for system files (which are the only type we read
458          * during mount). It's a heavier approach, but our main
459          * concern is user-accessible files anyway.
460          *
461          * #3 works itself out because we'll eventually take the
462          * cluster lock before trusting anything anyway.
463          */
464         can_lock = !(args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
465                 && !(args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY)
466                 && !ocfs2_mount_local(osb);
467 
468         trace_ocfs2_read_locked_inode(
469                 (unsigned long long)OCFS2_I(inode)->ip_blkno, can_lock);
470 
471         /*
472          * To maintain backwards compatibility with older versions of
473          * ocfs2-tools, we still store the generation value for system
474          * files. The only ones that actually matter to userspace are
475          * the journals, but it's easier and inexpensive to just flag
476          * all system files similarly.
477          */
478         if (args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
479                 generation = osb->fs_generation;
480 
481         ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,
482                                   OCFS2_LOCK_TYPE_META,
483                                   generation, inode);
484 
485         ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
486                                   OCFS2_LOCK_TYPE_OPEN,
487                                   0, inode);
488 
489         if (can_lock) {
490                 status = ocfs2_open_lock(inode);
491                 if (status) {
492                         make_bad_inode(inode);
493                         mlog_errno(status);
494                         return status;
495                 }
496                 status = ocfs2_inode_lock(inode, NULL, lock_level);
497                 if (status) {
498                         make_bad_inode(inode);
499                         mlog_errno(status);
500                         return status;
501                 }
502         }
503 
504         if (args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY) {
505                 status = ocfs2_try_open_lock(inode, 0);
506                 if (status) {
507                         make_bad_inode(inode);
508                         return status;
509                 }
510         }
511 
512         if (can_lock) {
513                 if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_CHK)
514                         status = ocfs2_filecheck_read_inode_block_full(inode,
515                                                 &bh, OCFS2_BH_IGNORE_CACHE, 0);
516                 else if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_FIX)
517                         status = ocfs2_filecheck_read_inode_block_full(inode,
518                                                 &bh, OCFS2_BH_IGNORE_CACHE, 1);
519                 else
520                         status = ocfs2_read_inode_block_full(inode,
521                                                 &bh, OCFS2_BH_IGNORE_CACHE);
522         } else {
523                 status = ocfs2_read_blocks_sync(osb, args->fi_blkno, 1, &bh);
524                 /*
525                  * If buffer is in jbd, then its checksum may not have been
526                  * computed as yet.
527                  */
528                 if (!status && !buffer_jbd(bh)) {
529                         if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_CHK)
530                                 status = ocfs2_filecheck_validate_inode_block(
531                                                                 osb->sb, bh);
532                         else if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_FIX)
533                                 status = ocfs2_filecheck_repair_inode_block(
534                                                                 osb->sb, bh);
535                         else
536                                 status = ocfs2_validate_inode_block(
537                                                                 osb->sb, bh);
538                 }
539         }
540         if (status < 0) {
541                 mlog_errno(status);
542                 goto bail;
543         }
544 
545         status = -EINVAL;
546         fe = (struct ocfs2_dinode *) bh->b_data;
547 
548         /*
549          * This is a code bug. Right now the caller needs to
550          * understand whether it is asking for a system file inode or
551          * not so the proper lock names can be built.
552          */
553         mlog_bug_on_msg(!!(fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) !=
554                         !!(args->fi_flags & OCFS2_FI_FLAG_SYSFILE),
555                         "Inode %llu: system file state is ambigous\n",
556                         (unsigned long long)args->fi_blkno);
557 
558         if (S_ISCHR(le16_to_cpu(fe->i_mode)) ||
559             S_ISBLK(le16_to_cpu(fe->i_mode)))
560                 inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
561 
562         ocfs2_populate_inode(inode, fe, 0);
563 
564         BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno));
565 
566         if (buffer_dirty(bh) && !buffer_jbd(bh)) {
567                 if (can_lock) {
568                         ocfs2_inode_unlock(inode, lock_level);
569                         lock_level = 1;
570                         ocfs2_inode_lock(inode, NULL, lock_level);
571                 }
572                 status = ocfs2_write_block(osb, bh, INODE_CACHE(inode));
573                 if (status < 0) {
574                         mlog_errno(status);
575                         goto bail;
576                 }
577         }
578 
579         status = 0;
580 
581 bail:
582         if (can_lock)
583                 ocfs2_inode_unlock(inode, lock_level);
584 
585         if (status < 0)
586                 make_bad_inode(inode);
587 
588         brelse(bh);
589 
590         return status;
591 }
592 
593 void ocfs2_sync_blockdev(struct super_block *sb)
594 {
595         sync_blockdev(sb->s_bdev);
596 }
597 
598 static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
599                                      struct inode *inode,
600                                      struct buffer_head *fe_bh)
601 {
602         int status = 0;
603         struct ocfs2_dinode *fe;
604         handle_t *handle = NULL;
605 
606         fe = (struct ocfs2_dinode *) fe_bh->b_data;
607 
608         /*
609          * This check will also skip truncate of inodes with inline
610          * data and fast symlinks.
611          */
612         if (fe->i_clusters) {
613                 if (ocfs2_should_order_data(inode))
614                         ocfs2_begin_ordered_truncate(inode, 0);
615 
616                 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
617                 if (IS_ERR(handle)) {
618                         status = PTR_ERR(handle);
619                         handle = NULL;
620                         mlog_errno(status);
621                         goto out;
622                 }
623 
624                 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
625                                                  fe_bh,
626                                                  OCFS2_JOURNAL_ACCESS_WRITE);
627                 if (status < 0) {
628                         mlog_errno(status);
629                         goto out;
630                 }
631 
632                 i_size_write(inode, 0);
633 
634                 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
635                 if (status < 0) {
636                         mlog_errno(status);
637                         goto out;
638                 }
639 
640                 ocfs2_commit_trans(osb, handle);
641                 handle = NULL;
642 
643                 status = ocfs2_commit_truncate(osb, inode, fe_bh);
644                 if (status < 0) {
645                         mlog_errno(status);
646                         goto out;
647                 }
648         }
649 
650 out:
651         if (handle)
652                 ocfs2_commit_trans(osb, handle);
653         return status;
654 }
655 
656 static int ocfs2_remove_inode(struct inode *inode,
657                               struct buffer_head *di_bh,
658                               struct inode *orphan_dir_inode,
659                               struct buffer_head *orphan_dir_bh)
660 {
661         int status;
662         struct inode *inode_alloc_inode = NULL;
663         struct buffer_head *inode_alloc_bh = NULL;
664         handle_t *handle;
665         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
666         struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
667 
668         inode_alloc_inode =
669                 ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
670                                             le16_to_cpu(di->i_suballoc_slot));
671         if (!inode_alloc_inode) {
672                 status = -ENOENT;
673                 mlog_errno(status);
674                 goto bail;
675         }
676 
677         inode_lock(inode_alloc_inode);
678         status = ocfs2_inode_lock(inode_alloc_inode, &inode_alloc_bh, 1);
679         if (status < 0) {
680                 inode_unlock(inode_alloc_inode);
681 
682                 mlog_errno(status);
683                 goto bail;
684         }
685 
686         handle = ocfs2_start_trans(osb, OCFS2_DELETE_INODE_CREDITS +
687                                    ocfs2_quota_trans_credits(inode->i_sb));
688         if (IS_ERR(handle)) {
689                 status = PTR_ERR(handle);
690                 mlog_errno(status);
691                 goto bail_unlock;
692         }
693 
694         if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
695                 status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
696                                           orphan_dir_bh, false);
697                 if (status < 0) {
698                         mlog_errno(status);
699                         goto bail_commit;
700                 }
701         }
702 
703         /* set the inodes dtime */
704         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
705                                          OCFS2_JOURNAL_ACCESS_WRITE);
706         if (status < 0) {
707                 mlog_errno(status);
708                 goto bail_commit;
709         }
710 
711         di->i_dtime = cpu_to_le64(CURRENT_TIME.tv_sec);
712         di->i_flags &= cpu_to_le32(~(OCFS2_VALID_FL | OCFS2_ORPHANED_FL));
713         ocfs2_journal_dirty(handle, di_bh);
714 
715         ocfs2_remove_from_cache(INODE_CACHE(inode), di_bh);
716         dquot_free_inode(inode);
717 
718         status = ocfs2_free_dinode(handle, inode_alloc_inode,
719                                    inode_alloc_bh, di);
720         if (status < 0)
721                 mlog_errno(status);
722 
723 bail_commit:
724         ocfs2_commit_trans(osb, handle);
725 bail_unlock:
726         ocfs2_inode_unlock(inode_alloc_inode, 1);
727         inode_unlock(inode_alloc_inode);
728         brelse(inode_alloc_bh);
729 bail:
730         iput(inode_alloc_inode);
731 
732         return status;
733 }
734 
735 /*
736  * Serialize with orphan dir recovery. If the process doing
737  * recovery on this orphan dir does an iget() with the dir
738  * i_mutex held, we'll deadlock here. Instead we detect this
739  * and exit early - recovery will wipe this inode for us.
740  */
741 static int ocfs2_check_orphan_recovery_state(struct ocfs2_super *osb,
742                                              int slot)
743 {
744         int ret = 0;
745 
746         spin_lock(&osb->osb_lock);
747         if (ocfs2_node_map_test_bit(osb, &osb->osb_recovering_orphan_dirs, slot)) {
748                 ret = -EDEADLK;
749                 goto out;
750         }
751         /* This signals to the orphan recovery process that it should
752          * wait for us to handle the wipe. */
753         osb->osb_orphan_wipes[slot]++;
754 out:
755         spin_unlock(&osb->osb_lock);
756         trace_ocfs2_check_orphan_recovery_state(slot, ret);
757         return ret;
758 }
759 
760 static void ocfs2_signal_wipe_completion(struct ocfs2_super *osb,
761                                          int slot)
762 {
763         spin_lock(&osb->osb_lock);
764         osb->osb_orphan_wipes[slot]--;
765         spin_unlock(&osb->osb_lock);
766 
767         wake_up(&osb->osb_wipe_event);
768 }
769 
770 static int ocfs2_wipe_inode(struct inode *inode,
771                             struct buffer_head *di_bh)
772 {
773         int status, orphaned_slot = -1;
774         struct inode *orphan_dir_inode = NULL;
775         struct buffer_head *orphan_dir_bh = NULL;
776         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
777         struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
778 
779         if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
780                 orphaned_slot = le16_to_cpu(di->i_orphaned_slot);
781 
782                 status = ocfs2_check_orphan_recovery_state(osb, orphaned_slot);
783                 if (status)
784                         return status;
785 
786                 orphan_dir_inode = ocfs2_get_system_file_inode(osb,
787                                                                ORPHAN_DIR_SYSTEM_INODE,
788                                                                orphaned_slot);
789                 if (!orphan_dir_inode) {
790                         status = -ENOENT;
791                         mlog_errno(status);
792                         goto bail;
793                 }
794 
795                 /* Lock the orphan dir. The lock will be held for the entire
796                  * delete_inode operation. We do this now to avoid races with
797                  * recovery completion on other nodes. */
798                 inode_lock(orphan_dir_inode);
799                 status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
800                 if (status < 0) {
801                         inode_unlock(orphan_dir_inode);
802 
803                         mlog_errno(status);
804                         goto bail;
805                 }
806         }
807 
808         /* we do this while holding the orphan dir lock because we
809          * don't want recovery being run from another node to try an
810          * inode delete underneath us -- this will result in two nodes
811          * truncating the same file! */
812         status = ocfs2_truncate_for_delete(osb, inode, di_bh);
813         if (status < 0) {
814                 mlog_errno(status);
815                 goto bail_unlock_dir;
816         }
817 
818         /* Remove any dir index tree */
819         if (S_ISDIR(inode->i_mode)) {
820                 status = ocfs2_dx_dir_truncate(inode, di_bh);
821                 if (status) {
822                         mlog_errno(status);
823                         goto bail_unlock_dir;
824                 }
825         }
826 
827         /*Free extended attribute resources associated with this inode.*/
828         status = ocfs2_xattr_remove(inode, di_bh);
829         if (status < 0) {
830                 mlog_errno(status);
831                 goto bail_unlock_dir;
832         }
833 
834         status = ocfs2_remove_refcount_tree(inode, di_bh);
835         if (status < 0) {
836                 mlog_errno(status);
837                 goto bail_unlock_dir;
838         }
839 
840         status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode,
841                                     orphan_dir_bh);
842         if (status < 0)
843                 mlog_errno(status);
844 
845 bail_unlock_dir:
846         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)
847                 return status;
848 
849         ocfs2_inode_unlock(orphan_dir_inode, 1);
850         inode_unlock(orphan_dir_inode);
851         brelse(orphan_dir_bh);
852 bail:
853         iput(orphan_dir_inode);
854         ocfs2_signal_wipe_completion(osb, orphaned_slot);
855 
856         return status;
857 }
858 
859 /* There is a series of simple checks that should be done before a
860  * trylock is even considered. Encapsulate those in this function. */
861 static int ocfs2_inode_is_valid_to_delete(struct inode *inode)
862 {
863         int ret = 0;
864         struct ocfs2_inode_info *oi = OCFS2_I(inode);
865         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
866 
867         trace_ocfs2_inode_is_valid_to_delete(current, osb->dc_task,
868                                              (unsigned long long)oi->ip_blkno,
869                                              oi->ip_flags);
870 
871         /* We shouldn't be getting here for the root directory
872          * inode.. */
873         if (inode == osb->root_inode) {
874                 mlog(ML_ERROR, "Skipping delete of root inode.\n");
875                 goto bail;
876         }
877 
878         /*
879          * If we're coming from downconvert_thread we can't go into our own
880          * voting [hello, deadlock city!] so we cannot delete the inode. But
881          * since we dropped last inode ref when downconverting dentry lock,
882          * we cannot have the file open and thus the node doing unlink will
883          * take care of deleting the inode.
884          */
885         if (current == osb->dc_task)
886                 goto bail;
887 
888         spin_lock(&oi->ip_lock);
889         /* OCFS2 *never* deletes system files. This should technically
890          * never get here as system file inodes should always have a
891          * positive link count. */
892         if (oi->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
893                 mlog(ML_ERROR, "Skipping delete of system file %llu\n",
894                      (unsigned long long)oi->ip_blkno);
895                 goto bail_unlock;
896         }
897 
898         ret = 1;
899 bail_unlock:
900         spin_unlock(&oi->ip_lock);
901 bail:
902         return ret;
903 }
904 
905 /* Query the cluster to determine whether we should wipe an inode from
906  * disk or not.
907  *
908  * Requires the inode to have the cluster lock. */
909 static int ocfs2_query_inode_wipe(struct inode *inode,
910                                   struct buffer_head *di_bh,
911                                   int *wipe)
912 {
913         int status = 0, reason = 0;
914         struct ocfs2_inode_info *oi = OCFS2_I(inode);
915         struct ocfs2_dinode *di;
916 
917         *wipe = 0;
918 
919         trace_ocfs2_query_inode_wipe_begin((unsigned long long)oi->ip_blkno,
920                                            inode->i_nlink);
921 
922         /* While we were waiting for the cluster lock in
923          * ocfs2_delete_inode, another node might have asked to delete
924          * the inode. Recheck our flags to catch this. */
925         if (!ocfs2_inode_is_valid_to_delete(inode)) {
926                 reason = 1;
927                 goto bail;
928         }
929 
930         /* Now that we have an up to date inode, we can double check
931          * the link count. */
932         if (inode->i_nlink)
933                 goto bail;
934 
935         /* Do some basic inode verification... */
936         di = (struct ocfs2_dinode *) di_bh->b_data;
937         if (!(di->i_flags & cpu_to_le32(OCFS2_ORPHANED_FL)) &&
938             !(oi->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
939                 /*
940                  * Inodes in the orphan dir must have ORPHANED_FL.  The only
941                  * inodes that come back out of the orphan dir are reflink
942                  * targets. A reflink target may be moved out of the orphan
943                  * dir between the time we scan the directory and the time we
944                  * process it. This would lead to HAS_REFCOUNT_FL being set but
945                  * ORPHANED_FL not.
946                  */
947                 if (di->i_dyn_features & cpu_to_le16(OCFS2_HAS_REFCOUNT_FL)) {
948                         reason = 2;
949                         goto bail;
950                 }
951 
952                 /* for lack of a better error? */
953                 status = -EEXIST;
954                 mlog(ML_ERROR,
955                      "Inode %llu (on-disk %llu) not orphaned! "
956                      "Disk flags  0x%x, inode flags 0x%x\n",
957                      (unsigned long long)oi->ip_blkno,
958                      (unsigned long long)le64_to_cpu(di->i_blkno),
959                      le32_to_cpu(di->i_flags), oi->ip_flags);
960                 goto bail;
961         }
962 
963         /* has someone already deleted us?! baaad... */
964         if (di->i_dtime) {
965                 status = -EEXIST;
966                 mlog_errno(status);
967                 goto bail;
968         }
969 
970         /*
971          * This is how ocfs2 determines whether an inode is still live
972          * within the cluster. Every node takes a shared read lock on
973          * the inode open lock in ocfs2_read_locked_inode(). When we
974          * get to ->delete_inode(), each node tries to convert it's
975          * lock to an exclusive. Trylocks are serialized by the inode
976          * meta data lock. If the upconvert succeeds, we know the inode
977          * is no longer live and can be deleted.
978          *
979          * Though we call this with the meta data lock held, the
980          * trylock keeps us from ABBA deadlock.
981          */
982         status = ocfs2_try_open_lock(inode, 1);
983         if (status == -EAGAIN) {
984                 status = 0;
985                 reason = 3;
986                 goto bail;
987         }
988         if (status < 0) {
989                 mlog_errno(status);
990                 goto bail;
991         }
992 
993         *wipe = 1;
994         trace_ocfs2_query_inode_wipe_succ(le16_to_cpu(di->i_orphaned_slot));
995 
996 bail:
997         trace_ocfs2_query_inode_wipe_end(status, reason);
998         return status;
999 }
1000 
1001 /* Support function for ocfs2_delete_inode. Will help us keep the
1002  * inode data in a consistent state for clear_inode. Always truncates
1003  * pages, optionally sync's them first. */
1004 static void ocfs2_cleanup_delete_inode(struct inode *inode,
1005                                        int sync_data)
1006 {
1007         trace_ocfs2_cleanup_delete_inode(
1008                 (unsigned long long)OCFS2_I(inode)->ip_blkno, sync_data);
1009         if (sync_data)
1010                 filemap_write_and_wait(inode->i_mapping);
1011         truncate_inode_pages_final(&inode->i_data);
1012 }
1013 
1014 static void ocfs2_delete_inode(struct inode *inode)
1015 {
1016         int wipe, status;
1017         sigset_t oldset;
1018         struct buffer_head *di_bh = NULL;
1019         struct ocfs2_dinode *di = NULL;
1020 
1021         trace_ocfs2_delete_inode(inode->i_ino,
1022                                  (unsigned long long)OCFS2_I(inode)->ip_blkno,
1023                                  is_bad_inode(inode));
1024 
1025         /* When we fail in read_inode() we mark inode as bad. The second test
1026          * catches the case when inode allocation fails before allocating
1027          * a block for inode. */
1028         if (is_bad_inode(inode) || !OCFS2_I(inode)->ip_blkno)
1029                 goto bail;
1030 
1031         if (!ocfs2_inode_is_valid_to_delete(inode)) {
1032                 /* It's probably not necessary to truncate_inode_pages
1033                  * here but we do it for safety anyway (it will most
1034                  * likely be a no-op anyway) */
1035                 ocfs2_cleanup_delete_inode(inode, 0);
1036                 goto bail;
1037         }
1038 
1039         dquot_initialize(inode);
1040 
1041         /* We want to block signals in delete_inode as the lock and
1042          * messaging paths may return us -ERESTARTSYS. Which would
1043          * cause us to exit early, resulting in inodes being orphaned
1044          * forever. */
1045         ocfs2_block_signals(&oldset);
1046 
1047         /*
1048          * Synchronize us against ocfs2_get_dentry. We take this in
1049          * shared mode so that all nodes can still concurrently
1050          * process deletes.
1051          */
1052         status = ocfs2_nfs_sync_lock(OCFS2_SB(inode->i_sb), 0);
1053         if (status < 0) {
1054                 mlog(ML_ERROR, "getting nfs sync lock(PR) failed %d\n", status);
1055                 ocfs2_cleanup_delete_inode(inode, 0);
1056                 goto bail_unblock;
1057         }
1058         /* Lock down the inode. This gives us an up to date view of
1059          * it's metadata (for verification), and allows us to
1060          * serialize delete_inode on multiple nodes.
1061          *
1062          * Even though we might be doing a truncate, we don't take the
1063          * allocation lock here as it won't be needed - nobody will
1064          * have the file open.
1065          */
1066         status = ocfs2_inode_lock(inode, &di_bh, 1);
1067         if (status < 0) {
1068                 if (status != -ENOENT)
1069                         mlog_errno(status);
1070                 ocfs2_cleanup_delete_inode(inode, 0);
1071                 goto bail_unlock_nfs_sync;
1072         }
1073 
1074         di = (struct ocfs2_dinode *)di_bh->b_data;
1075         /* Skip inode deletion and wait for dio orphan entry recovered
1076          * first */
1077         if (unlikely(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
1078                 ocfs2_cleanup_delete_inode(inode, 0);
1079                 goto bail_unlock_inode;
1080         }
1081 
1082         /* Query the cluster. This will be the final decision made
1083          * before we go ahead and wipe the inode. */
1084         status = ocfs2_query_inode_wipe(inode, di_bh, &wipe);
1085         if (!wipe || status < 0) {
1086                 /* Error and remote inode busy both mean we won't be
1087                  * removing the inode, so they take almost the same
1088                  * path. */
1089                 if (status < 0)
1090                         mlog_errno(status);
1091 
1092                 /* Someone in the cluster has disallowed a wipe of
1093                  * this inode, or it was never completely
1094                  * orphaned. Write out the pages and exit now. */
1095                 ocfs2_cleanup_delete_inode(inode, 1);
1096                 goto bail_unlock_inode;
1097         }
1098 
1099         ocfs2_cleanup_delete_inode(inode, 0);
1100 
1101         status = ocfs2_wipe_inode(inode, di_bh);
1102         if (status < 0) {
1103                 if (status != -EDEADLK)
1104                         mlog_errno(status);
1105                 goto bail_unlock_inode;
1106         }
1107 
1108         /*
1109          * Mark the inode as successfully deleted.
1110          *
1111          * This is important for ocfs2_clear_inode() as it will check
1112          * this flag and skip any checkpointing work
1113          *
1114          * ocfs2_stuff_meta_lvb() also uses this flag to invalidate
1115          * the LVB for other nodes.
1116          */
1117         OCFS2_I(inode)->ip_flags |= OCFS2_INODE_DELETED;
1118 
1119 bail_unlock_inode:
1120         ocfs2_inode_unlock(inode, 1);
1121         brelse(di_bh);
1122 
1123 bail_unlock_nfs_sync:
1124         ocfs2_nfs_sync_unlock(OCFS2_SB(inode->i_sb), 0);
1125 
1126 bail_unblock:
1127         ocfs2_unblock_signals(&oldset);
1128 bail:
1129         return;
1130 }
1131 
1132 static void ocfs2_clear_inode(struct inode *inode)
1133 {
1134         int status;
1135         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1136         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1137 
1138         clear_inode(inode);
1139         trace_ocfs2_clear_inode((unsigned long long)oi->ip_blkno,
1140                                 inode->i_nlink);
1141 
1142         mlog_bug_on_msg(OCFS2_SB(inode->i_sb) == NULL,
1143                         "Inode=%lu\n", inode->i_ino);
1144 
1145         dquot_drop(inode);
1146 
1147         /* To preven remote deletes we hold open lock before, now it
1148          * is time to unlock PR and EX open locks. */
1149         ocfs2_open_unlock(inode);
1150 
1151         /* Do these before all the other work so that we don't bounce
1152          * the downconvert thread while waiting to destroy the locks. */
1153         ocfs2_mark_lockres_freeing(osb, &oi->ip_rw_lockres);
1154         ocfs2_mark_lockres_freeing(osb, &oi->ip_inode_lockres);
1155         ocfs2_mark_lockres_freeing(osb, &oi->ip_open_lockres);
1156 
1157         ocfs2_resv_discard(&OCFS2_SB(inode->i_sb)->osb_la_resmap,
1158                            &oi->ip_la_data_resv);
1159         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1160 
1161         /* We very well may get a clear_inode before all an inodes
1162          * metadata has hit disk. Of course, we can't drop any cluster
1163          * locks until the journal has finished with it. The only
1164          * exception here are successfully wiped inodes - their
1165          * metadata can now be considered to be part of the system
1166          * inodes from which it came. */
1167         if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED))
1168                 ocfs2_checkpoint_inode(inode);
1169 
1170         mlog_bug_on_msg(!list_empty(&oi->ip_io_markers),
1171                         "Clear inode of %llu, inode has io markers\n",
1172                         (unsigned long long)oi->ip_blkno);
1173         mlog_bug_on_msg(!list_empty(&oi->ip_unwritten_list),
1174                         "Clear inode of %llu, inode has unwritten extents\n",
1175                         (unsigned long long)oi->ip_blkno);
1176 
1177         ocfs2_extent_map_trunc(inode, 0);
1178 
1179         status = ocfs2_drop_inode_locks(inode);
1180         if (status < 0)
1181                 mlog_errno(status);
1182 
1183         ocfs2_lock_res_free(&oi->ip_rw_lockres);
1184         ocfs2_lock_res_free(&oi->ip_inode_lockres);
1185         ocfs2_lock_res_free(&oi->ip_open_lockres);
1186 
1187         ocfs2_metadata_cache_exit(INODE_CACHE(inode));
1188 
1189         mlog_bug_on_msg(INODE_CACHE(inode)->ci_num_cached,
1190                         "Clear inode of %llu, inode has %u cache items\n",
1191                         (unsigned long long)oi->ip_blkno,
1192                         INODE_CACHE(inode)->ci_num_cached);
1193 
1194         mlog_bug_on_msg(!(INODE_CACHE(inode)->ci_flags & OCFS2_CACHE_FL_INLINE),
1195                         "Clear inode of %llu, inode has a bad flag\n",
1196                         (unsigned long long)oi->ip_blkno);
1197 
1198         mlog_bug_on_msg(spin_is_locked(&oi->ip_lock),
1199                         "Clear inode of %llu, inode is locked\n",
1200                         (unsigned long long)oi->ip_blkno);
1201 
1202         mlog_bug_on_msg(!mutex_trylock(&oi->ip_io_mutex),
1203                         "Clear inode of %llu, io_mutex is locked\n",
1204                         (unsigned long long)oi->ip_blkno);
1205         mutex_unlock(&oi->ip_io_mutex);
1206 
1207         /*
1208          * down_trylock() returns 0, down_write_trylock() returns 1
1209          * kernel 1, world 0
1210          */
1211         mlog_bug_on_msg(!down_write_trylock(&oi->ip_alloc_sem),
1212                         "Clear inode of %llu, alloc_sem is locked\n",
1213                         (unsigned long long)oi->ip_blkno);
1214         up_write(&oi->ip_alloc_sem);
1215 
1216         mlog_bug_on_msg(oi->ip_open_count,
1217                         "Clear inode of %llu has open count %d\n",
1218                         (unsigned long long)oi->ip_blkno, oi->ip_open_count);
1219 
1220         /* Clear all other flags. */
1221         oi->ip_flags = 0;
1222         oi->ip_dir_start_lookup = 0;
1223         oi->ip_blkno = 0ULL;
1224 
1225         /*
1226          * ip_jinode is used to track txns against this inode. We ensure that
1227          * the journal is flushed before journal shutdown. Thus it is safe to
1228          * have inodes get cleaned up after journal shutdown.
1229          */
1230         jbd2_journal_release_jbd_inode(OCFS2_SB(inode->i_sb)->journal->j_journal,
1231                                        &oi->ip_jinode);
1232 }
1233 
1234 void ocfs2_evict_inode(struct inode *inode)
1235 {
1236         if (!inode->i_nlink ||
1237             (OCFS2_I(inode)->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)) {
1238                 ocfs2_delete_inode(inode);
1239         } else {
1240                 truncate_inode_pages_final(&inode->i_data);
1241         }
1242         ocfs2_clear_inode(inode);
1243 }
1244 
1245 /* Called under inode_lock, with no more references on the
1246  * struct inode, so it's safe here to check the flags field
1247  * and to manipulate i_nlink without any other locks. */
1248 int ocfs2_drop_inode(struct inode *inode)
1249 {
1250         struct ocfs2_inode_info *oi = OCFS2_I(inode);
1251 
1252         trace_ocfs2_drop_inode((unsigned long long)oi->ip_blkno,
1253                                 inode->i_nlink, oi->ip_flags);
1254 
1255         assert_spin_locked(&inode->i_lock);
1256         inode->i_state |= I_WILL_FREE;
1257         spin_unlock(&inode->i_lock);
1258         write_inode_now(inode, 1);
1259         spin_lock(&inode->i_lock);
1260         WARN_ON(inode->i_state & I_NEW);
1261         inode->i_state &= ~I_WILL_FREE;
1262 
1263         return 1;
1264 }
1265 
1266 /*
1267  * This is called from our getattr.
1268  */
1269 int ocfs2_inode_revalidate(struct dentry *dentry)
1270 {
1271         struct inode *inode = d_inode(dentry);
1272         int status = 0;
1273 
1274         trace_ocfs2_inode_revalidate(inode,
1275                 inode ? (unsigned long long)OCFS2_I(inode)->ip_blkno : 0ULL,
1276                 inode ? (unsigned long long)OCFS2_I(inode)->ip_flags : 0);
1277 
1278         if (!inode) {
1279                 status = -ENOENT;
1280                 goto bail;
1281         }
1282 
1283         spin_lock(&OCFS2_I(inode)->ip_lock);
1284         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
1285                 spin_unlock(&OCFS2_I(inode)->ip_lock);
1286                 status = -ENOENT;
1287                 goto bail;
1288         }
1289         spin_unlock(&OCFS2_I(inode)->ip_lock);
1290 
1291         /* Let ocfs2_inode_lock do the work of updating our struct
1292          * inode for us. */
1293         status = ocfs2_inode_lock(inode, NULL, 0);
1294         if (status < 0) {
1295                 if (status != -ENOENT)
1296                         mlog_errno(status);
1297                 goto bail;
1298         }
1299         ocfs2_inode_unlock(inode, 0);
1300 bail:
1301         return status;
1302 }
1303 
1304 /*
1305  * Updates a disk inode from a
1306  * struct inode.
1307  * Only takes ip_lock.
1308  */
1309 int ocfs2_mark_inode_dirty(handle_t *handle,
1310                            struct inode *inode,
1311                            struct buffer_head *bh)
1312 {
1313         int status;
1314         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
1315 
1316         trace_ocfs2_mark_inode_dirty((unsigned long long)OCFS2_I(inode)->ip_blkno);
1317 
1318         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1319                                          OCFS2_JOURNAL_ACCESS_WRITE);
1320         if (status < 0) {
1321                 mlog_errno(status);
1322                 goto leave;
1323         }
1324 
1325         spin_lock(&OCFS2_I(inode)->ip_lock);
1326         fe->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);
1327         ocfs2_get_inode_flags(OCFS2_I(inode));
1328         fe->i_attr = cpu_to_le32(OCFS2_I(inode)->ip_attr);
1329         fe->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
1330         spin_unlock(&OCFS2_I(inode)->ip_lock);
1331 
1332         fe->i_size = cpu_to_le64(i_size_read(inode));
1333         ocfs2_set_links_count(fe, inode->i_nlink);
1334         fe->i_uid = cpu_to_le32(i_uid_read(inode));
1335         fe->i_gid = cpu_to_le32(i_gid_read(inode));
1336         fe->i_mode = cpu_to_le16(inode->i_mode);
1337         fe->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
1338         fe->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
1339         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1340         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1341         fe->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
1342         fe->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
1343 
1344         ocfs2_journal_dirty(handle, bh);
1345         ocfs2_update_inode_fsync_trans(handle, inode, 1);
1346 leave:
1347         return status;
1348 }
1349 
1350 /*
1351  *
1352  * Updates a struct inode from a disk inode.
1353  * does no i/o, only takes ip_lock.
1354  */
1355 void ocfs2_refresh_inode(struct inode *inode,
1356                          struct ocfs2_dinode *fe)
1357 {
1358         spin_lock(&OCFS2_I(inode)->ip_lock);
1359 
1360         OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
1361         OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
1362         OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
1363         ocfs2_set_inode_flags(inode);
1364         i_size_write(inode, le64_to_cpu(fe->i_size));
1365         set_nlink(inode, ocfs2_read_links_count(fe));
1366         i_uid_write(inode, le32_to_cpu(fe->i_uid));
1367         i_gid_write(inode, le32_to_cpu(fe->i_gid));
1368         inode->i_mode = le16_to_cpu(fe->i_mode);
1369         if (S_ISLNK(inode->i_mode) && le32_to_cpu(fe->i_clusters) == 0)
1370                 inode->i_blocks = 0;
1371         else
1372                 inode->i_blocks = ocfs2_inode_sector_count(inode);
1373         inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
1374         inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
1375         inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
1376         inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
1377         inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
1378         inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
1379 
1380         spin_unlock(&OCFS2_I(inode)->ip_lock);
1381 }
1382 
1383 int ocfs2_validate_inode_block(struct super_block *sb,
1384                                struct buffer_head *bh)
1385 {
1386         int rc;
1387         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1388 
1389         trace_ocfs2_validate_inode_block((unsigned long long)bh->b_blocknr);
1390 
1391         BUG_ON(!buffer_uptodate(bh));
1392 
1393         /*
1394          * If the ecc fails, we return the error but otherwise
1395          * leave the filesystem running.  We know any error is
1396          * local to this block.
1397          */
1398         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check);
1399         if (rc) {
1400                 mlog(ML_ERROR, "Checksum failed for dinode %llu\n",
1401                      (unsigned long long)bh->b_blocknr);
1402                 goto bail;
1403         }
1404 
1405         /*
1406          * Errors after here are fatal.
1407          */
1408 
1409         rc = -EINVAL;
1410 
1411         if (!OCFS2_IS_VALID_DINODE(di)) {
1412                 rc = ocfs2_error(sb, "Invalid dinode #%llu: signature = %.*s\n",
1413                                  (unsigned long long)bh->b_blocknr, 7,
1414                                  di->i_signature);
1415                 goto bail;
1416         }
1417 
1418         if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
1419                 rc = ocfs2_error(sb, "Invalid dinode #%llu: i_blkno is %llu\n",
1420                                  (unsigned long long)bh->b_blocknr,
1421                                  (unsigned long long)le64_to_cpu(di->i_blkno));
1422                 goto bail;
1423         }
1424 
1425         if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
1426                 rc = ocfs2_error(sb,
1427                                  "Invalid dinode #%llu: OCFS2_VALID_FL not set\n",
1428                                  (unsigned long long)bh->b_blocknr);
1429                 goto bail;
1430         }
1431 
1432         if (le32_to_cpu(di->i_fs_generation) !=
1433             OCFS2_SB(sb)->fs_generation) {
1434                 rc = ocfs2_error(sb,
1435                                  "Invalid dinode #%llu: fs_generation is %u\n",
1436                                  (unsigned long long)bh->b_blocknr,
1437                                  le32_to_cpu(di->i_fs_generation));
1438                 goto bail;
1439         }
1440 
1441         rc = 0;
1442 
1443 bail:
1444         return rc;
1445 }
1446 
1447 static int ocfs2_filecheck_validate_inode_block(struct super_block *sb,
1448                                                 struct buffer_head *bh)
1449 {
1450         int rc = 0;
1451         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1452 
1453         trace_ocfs2_filecheck_validate_inode_block(
1454                 (unsigned long long)bh->b_blocknr);
1455 
1456         BUG_ON(!buffer_uptodate(bh));
1457 
1458         /*
1459          * Call ocfs2_validate_meta_ecc() first since it has ecc repair
1460          * function, but we should not return error immediately when ecc
1461          * validation fails, because the reason is quite likely the invalid
1462          * inode number inputed.
1463          */
1464         rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check);
1465         if (rc) {
1466                 mlog(ML_ERROR,
1467                      "Filecheck: checksum failed for dinode %llu\n",
1468                      (unsigned long long)bh->b_blocknr);
1469                 rc = -OCFS2_FILECHECK_ERR_BLOCKECC;
1470         }
1471 
1472         if (!OCFS2_IS_VALID_DINODE(di)) {
1473                 mlog(ML_ERROR,
1474                      "Filecheck: invalid dinode #%llu: signature = %.*s\n",
1475                      (unsigned long long)bh->b_blocknr, 7, di->i_signature);
1476                 rc = -OCFS2_FILECHECK_ERR_INVALIDINO;
1477                 goto bail;
1478         } else if (rc)
1479                 goto bail;
1480 
1481         if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
1482                 mlog(ML_ERROR,
1483                      "Filecheck: invalid dinode #%llu: i_blkno is %llu\n",
1484                      (unsigned long long)bh->b_blocknr,
1485                      (unsigned long long)le64_to_cpu(di->i_blkno));
1486                 rc = -OCFS2_FILECHECK_ERR_BLOCKNO;
1487                 goto bail;
1488         }
1489 
1490         if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
1491                 mlog(ML_ERROR,
1492                      "Filecheck: invalid dinode #%llu: OCFS2_VALID_FL "
1493                      "not set\n",
1494                      (unsigned long long)bh->b_blocknr);
1495                 rc = -OCFS2_FILECHECK_ERR_VALIDFLAG;
1496                 goto bail;
1497         }
1498 
1499         if (le32_to_cpu(di->i_fs_generation) !=
1500             OCFS2_SB(sb)->fs_generation) {
1501                 mlog(ML_ERROR,
1502                      "Filecheck: invalid dinode #%llu: fs_generation is %u\n",
1503                      (unsigned long long)bh->b_blocknr,
1504                      le32_to_cpu(di->i_fs_generation));
1505                 rc = -OCFS2_FILECHECK_ERR_GENERATION;
1506                 goto bail;
1507         }
1508 
1509 bail:
1510         return rc;
1511 }
1512 
1513 static int ocfs2_filecheck_repair_inode_block(struct super_block *sb,
1514                                               struct buffer_head *bh)
1515 {
1516         int changed = 0;
1517         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1518 
1519         if (!ocfs2_filecheck_validate_inode_block(sb, bh))
1520                 return 0;
1521 
1522         trace_ocfs2_filecheck_repair_inode_block(
1523                 (unsigned long long)bh->b_blocknr);
1524 
1525         if (ocfs2_is_hard_readonly(OCFS2_SB(sb)) ||
1526             ocfs2_is_soft_readonly(OCFS2_SB(sb))) {
1527                 mlog(ML_ERROR,
1528                      "Filecheck: cannot repair dinode #%llu "
1529                      "on readonly filesystem\n",
1530                      (unsigned long long)bh->b_blocknr);
1531                 return -OCFS2_FILECHECK_ERR_READONLY;
1532         }
1533 
1534         if (buffer_jbd(bh)) {
1535                 mlog(ML_ERROR,
1536                      "Filecheck: cannot repair dinode #%llu, "
1537                      "its buffer is in jbd\n",
1538                      (unsigned long long)bh->b_blocknr);
1539                 return -OCFS2_FILECHECK_ERR_INJBD;
1540         }
1541 
1542         if (!OCFS2_IS_VALID_DINODE(di)) {
1543                 /* Cannot fix invalid inode block */
1544                 return -OCFS2_FILECHECK_ERR_INVALIDINO;
1545         }
1546 
1547         if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
1548                 /* Cannot just add VALID_FL flag back as a fix,
1549                  * need more things to check here.
1550                  */
1551                 return -OCFS2_FILECHECK_ERR_VALIDFLAG;
1552         }
1553 
1554         if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
1555                 di->i_blkno = cpu_to_le64(bh->b_blocknr);
1556                 changed = 1;
1557                 mlog(ML_ERROR,
1558                      "Filecheck: reset dinode #%llu: i_blkno to %llu\n",
1559                      (unsigned long long)bh->b_blocknr,
1560                      (unsigned long long)le64_to_cpu(di->i_blkno));
1561         }
1562 
1563         if (le32_to_cpu(di->i_fs_generation) !=
1564             OCFS2_SB(sb)->fs_generation) {
1565                 di->i_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1566                 changed = 1;
1567                 mlog(ML_ERROR,
1568                      "Filecheck: reset dinode #%llu: fs_generation to %u\n",
1569                      (unsigned long long)bh->b_blocknr,
1570                      le32_to_cpu(di->i_fs_generation));
1571         }
1572 
1573         if (changed || ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check)) {
1574                 ocfs2_compute_meta_ecc(sb, bh->b_data, &di->i_check);
1575                 mark_buffer_dirty(bh);
1576                 mlog(ML_ERROR,
1577                      "Filecheck: reset dinode #%llu: compute meta ecc\n",
1578                      (unsigned long long)bh->b_blocknr);
1579         }
1580 
1581         return 0;
1582 }
1583 
1584 static int
1585 ocfs2_filecheck_read_inode_block_full(struct inode *inode,
1586                                       struct buffer_head **bh,
1587                                       int flags, int type)
1588 {
1589         int rc;
1590         struct buffer_head *tmp = *bh;
1591 
1592         if (!type) /* Check inode block */
1593                 rc = ocfs2_read_blocks(INODE_CACHE(inode),
1594                                 OCFS2_I(inode)->ip_blkno,
1595                                 1, &tmp, flags,
1596                                 ocfs2_filecheck_validate_inode_block);
1597         else /* Repair inode block */
1598                 rc = ocfs2_read_blocks(INODE_CACHE(inode),
1599                                 OCFS2_I(inode)->ip_blkno,
1600                                 1, &tmp, flags,
1601                                 ocfs2_filecheck_repair_inode_block);
1602 
1603         /* If ocfs2_read_blocks() got us a new bh, pass it up. */
1604         if (!rc && !*bh)
1605                 *bh = tmp;
1606 
1607         return rc;
1608 }
1609 
1610 int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
1611                                 int flags)
1612 {
1613         int rc;
1614         struct buffer_head *tmp = *bh;
1615 
1616         rc = ocfs2_read_blocks(INODE_CACHE(inode), OCFS2_I(inode)->ip_blkno,
1617                                1, &tmp, flags, ocfs2_validate_inode_block);
1618 
1619         /* If ocfs2_read_blocks() got us a new bh, pass it up. */
1620         if (!rc && !*bh)
1621                 *bh = tmp;
1622 
1623         return rc;
1624 }
1625 
1626 int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh)
1627 {
1628         return ocfs2_read_inode_block_full(inode, bh, 0);
1629 }
1630 
1631 
1632 static u64 ocfs2_inode_cache_owner(struct ocfs2_caching_info *ci)
1633 {
1634         struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1635 
1636         return oi->ip_blkno;
1637 }
1638 
1639 static struct super_block *ocfs2_inode_cache_get_super(struct ocfs2_caching_info *ci)
1640 {
1641         struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1642 
1643         return oi->vfs_inode.i_sb;
1644 }
1645 
1646 static void ocfs2_inode_cache_lock(struct ocfs2_caching_info *ci)
1647 {
1648         struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1649 
1650         spin_lock(&oi->ip_lock);
1651 }
1652 
1653 static void ocfs2_inode_cache_unlock(struct ocfs2_caching_info *ci)
1654 {
1655         struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1656 
1657         spin_unlock(&oi->ip_lock);
1658 }
1659 
1660 static void ocfs2_inode_cache_io_lock(struct ocfs2_caching_info *ci)
1661 {
1662         struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1663 
1664         mutex_lock(&oi->ip_io_mutex);
1665 }
1666 
1667 static void ocfs2_inode_cache_io_unlock(struct ocfs2_caching_info *ci)
1668 {
1669         struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1670 
1671         mutex_unlock(&oi->ip_io_mutex);
1672 }
1673 
1674 const struct ocfs2_caching_operations ocfs2_inode_caching_ops = {
1675         .co_owner               = ocfs2_inode_cache_owner,
1676         .co_get_super           = ocfs2_inode_cache_get_super,
1677         .co_cache_lock          = ocfs2_inode_cache_lock,
1678         .co_cache_unlock        = ocfs2_inode_cache_unlock,
1679         .co_io_lock             = ocfs2_inode_cache_io_lock,
1680         .co_io_unlock           = ocfs2_inode_cache_io_unlock,
1681 };
1682 
1683 

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