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

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