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TOMOYO Linux Cross Reference
Linux/fs/xfs/libxfs/xfs_inode_buf.c

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  1 /*
  2  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  3  * All Rights Reserved.
  4  *
  5  * This program is free software; you can redistribute it and/or
  6  * modify it under the terms of the GNU General Public License as
  7  * published by the Free Software Foundation.
  8  *
  9  * This program is distributed in the hope that it would be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write the Free Software Foundation,
 16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 17  */
 18 #include "xfs.h"
 19 #include "xfs_fs.h"
 20 #include "xfs_shared.h"
 21 #include "xfs_format.h"
 22 #include "xfs_log_format.h"
 23 #include "xfs_trans_resv.h"
 24 #include "xfs_mount.h"
 25 #include "xfs_defer.h"
 26 #include "xfs_inode.h"
 27 #include "xfs_error.h"
 28 #include "xfs_cksum.h"
 29 #include "xfs_icache.h"
 30 #include "xfs_trans.h"
 31 #include "xfs_ialloc.h"
 32 #include "xfs_dir2.h"
 33 
 34 /*
 35  * Check that none of the inode's in the buffer have a next
 36  * unlinked field of 0.
 37  */
 38 #if defined(DEBUG)
 39 void
 40 xfs_inobp_check(
 41         xfs_mount_t     *mp,
 42         xfs_buf_t       *bp)
 43 {
 44         int             i;
 45         int             j;
 46         xfs_dinode_t    *dip;
 47 
 48         j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
 49 
 50         for (i = 0; i < j; i++) {
 51                 dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize);
 52                 if (!dip->di_next_unlinked)  {
 53                         xfs_alert(mp,
 54         "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
 55                                 i, (long long)bp->b_bn);
 56                 }
 57         }
 58 }
 59 #endif
 60 
 61 bool
 62 xfs_dinode_good_version(
 63         struct xfs_mount *mp,
 64         __u8            version)
 65 {
 66         if (xfs_sb_version_hascrc(&mp->m_sb))
 67                 return version == 3;
 68 
 69         return version == 1 || version == 2;
 70 }
 71 
 72 /*
 73  * If we are doing readahead on an inode buffer, we might be in log recovery
 74  * reading an inode allocation buffer that hasn't yet been replayed, and hence
 75  * has not had the inode cores stamped into it. Hence for readahead, the buffer
 76  * may be potentially invalid.
 77  *
 78  * If the readahead buffer is invalid, we need to mark it with an error and
 79  * clear the DONE status of the buffer so that a followup read will re-read it
 80  * from disk. We don't report the error otherwise to avoid warnings during log
 81  * recovery and we don't get unnecssary panics on debug kernels. We use EIO here
 82  * because all we want to do is say readahead failed; there is no-one to report
 83  * the error to, so this will distinguish it from a non-ra verifier failure.
 84  * Changes to this readahead error behavour also need to be reflected in
 85  * xfs_dquot_buf_readahead_verify().
 86  */
 87 static void
 88 xfs_inode_buf_verify(
 89         struct xfs_buf  *bp,
 90         bool            readahead)
 91 {
 92         struct xfs_mount *mp = bp->b_target->bt_mount;
 93         int             i;
 94         int             ni;
 95 
 96         /*
 97          * Validate the magic number and version of every inode in the buffer
 98          */
 99         ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
100         for (i = 0; i < ni; i++) {
101                 int             di_ok;
102                 xfs_dinode_t    *dip;
103 
104                 dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
105                 di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
106                         xfs_dinode_good_version(mp, dip->di_version);
107                 if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
108                                                 XFS_ERRTAG_ITOBP_INOTOBP,
109                                                 XFS_RANDOM_ITOBP_INOTOBP))) {
110                         if (readahead) {
111                                 bp->b_flags &= ~XBF_DONE;
112                                 xfs_buf_ioerror(bp, -EIO);
113                                 return;
114                         }
115 
116                         xfs_buf_ioerror(bp, -EFSCORRUPTED);
117                         xfs_verifier_error(bp);
118 #ifdef DEBUG
119                         xfs_alert(mp,
120                                 "bad inode magic/vsn daddr %lld #%d (magic=%x)",
121                                 (unsigned long long)bp->b_bn, i,
122                                 be16_to_cpu(dip->di_magic));
123 #endif
124                 }
125         }
126         xfs_inobp_check(mp, bp);
127 }
128 
129 
130 static void
131 xfs_inode_buf_read_verify(
132         struct xfs_buf  *bp)
133 {
134         xfs_inode_buf_verify(bp, false);
135 }
136 
137 static void
138 xfs_inode_buf_readahead_verify(
139         struct xfs_buf  *bp)
140 {
141         xfs_inode_buf_verify(bp, true);
142 }
143 
144 static void
145 xfs_inode_buf_write_verify(
146         struct xfs_buf  *bp)
147 {
148         xfs_inode_buf_verify(bp, false);
149 }
150 
151 const struct xfs_buf_ops xfs_inode_buf_ops = {
152         .name = "xfs_inode",
153         .verify_read = xfs_inode_buf_read_verify,
154         .verify_write = xfs_inode_buf_write_verify,
155 };
156 
157 const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
158         .name = "xxfs_inode_ra",
159         .verify_read = xfs_inode_buf_readahead_verify,
160         .verify_write = xfs_inode_buf_write_verify,
161 };
162 
163 
164 /*
165  * This routine is called to map an inode to the buffer containing the on-disk
166  * version of the inode.  It returns a pointer to the buffer containing the
167  * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
168  * pointer to the on-disk inode within that buffer.
169  *
170  * If a non-zero error is returned, then the contents of bpp and dipp are
171  * undefined.
172  */
173 int
174 xfs_imap_to_bp(
175         struct xfs_mount        *mp,
176         struct xfs_trans        *tp,
177         struct xfs_imap         *imap,
178         struct xfs_dinode       **dipp,
179         struct xfs_buf          **bpp,
180         uint                    buf_flags,
181         uint                    iget_flags)
182 {
183         struct xfs_buf          *bp;
184         int                     error;
185 
186         buf_flags |= XBF_UNMAPPED;
187         error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
188                                    (int)imap->im_len, buf_flags, &bp,
189                                    &xfs_inode_buf_ops);
190         if (error) {
191                 if (error == -EAGAIN) {
192                         ASSERT(buf_flags & XBF_TRYLOCK);
193                         return error;
194                 }
195 
196                 if (error == -EFSCORRUPTED &&
197                     (iget_flags & XFS_IGET_UNTRUSTED))
198                         return -EINVAL;
199 
200                 xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
201                         __func__, error);
202                 return error;
203         }
204 
205         *bpp = bp;
206         *dipp = xfs_buf_offset(bp, imap->im_boffset);
207         return 0;
208 }
209 
210 void
211 xfs_inode_from_disk(
212         struct xfs_inode        *ip,
213         struct xfs_dinode       *from)
214 {
215         struct xfs_icdinode     *to = &ip->i_d;
216         struct inode            *inode = VFS_I(ip);
217 
218 
219         /*
220          * Convert v1 inodes immediately to v2 inode format as this is the
221          * minimum inode version format we support in the rest of the code.
222          */
223         to->di_version = from->di_version;
224         if (to->di_version == 1) {
225                 set_nlink(inode, be16_to_cpu(from->di_onlink));
226                 to->di_projid_lo = 0;
227                 to->di_projid_hi = 0;
228                 to->di_version = 2;
229         } else {
230                 set_nlink(inode, be32_to_cpu(from->di_nlink));
231                 to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
232                 to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
233         }
234 
235         to->di_format = from->di_format;
236         to->di_uid = be32_to_cpu(from->di_uid);
237         to->di_gid = be32_to_cpu(from->di_gid);
238         to->di_flushiter = be16_to_cpu(from->di_flushiter);
239 
240         /*
241          * Time is signed, so need to convert to signed 32 bit before
242          * storing in inode timestamp which may be 64 bit. Otherwise
243          * a time before epoch is converted to a time long after epoch
244          * on 64 bit systems.
245          */
246         inode->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec);
247         inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec);
248         inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec);
249         inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec);
250         inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec);
251         inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec);
252         inode->i_generation = be32_to_cpu(from->di_gen);
253         inode->i_mode = be16_to_cpu(from->di_mode);
254 
255         to->di_size = be64_to_cpu(from->di_size);
256         to->di_nblocks = be64_to_cpu(from->di_nblocks);
257         to->di_extsize = be32_to_cpu(from->di_extsize);
258         to->di_nextents = be32_to_cpu(from->di_nextents);
259         to->di_anextents = be16_to_cpu(from->di_anextents);
260         to->di_forkoff = from->di_forkoff;
261         to->di_aformat  = from->di_aformat;
262         to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
263         to->di_dmstate  = be16_to_cpu(from->di_dmstate);
264         to->di_flags    = be16_to_cpu(from->di_flags);
265 
266         if (to->di_version == 3) {
267                 inode->i_version = be64_to_cpu(from->di_changecount);
268                 to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
269                 to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
270                 to->di_flags2 = be64_to_cpu(from->di_flags2);
271                 to->di_cowextsize = be32_to_cpu(from->di_cowextsize);
272         }
273 }
274 
275 void
276 xfs_inode_to_disk(
277         struct xfs_inode        *ip,
278         struct xfs_dinode       *to,
279         xfs_lsn_t               lsn)
280 {
281         struct xfs_icdinode     *from = &ip->i_d;
282         struct inode            *inode = VFS_I(ip);
283 
284         to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
285         to->di_onlink = 0;
286 
287         to->di_version = from->di_version;
288         to->di_format = from->di_format;
289         to->di_uid = cpu_to_be32(from->di_uid);
290         to->di_gid = cpu_to_be32(from->di_gid);
291         to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
292         to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
293 
294         memset(to->di_pad, 0, sizeof(to->di_pad));
295         to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec);
296         to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
297         to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec);
298         to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
299         to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
300         to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
301         to->di_nlink = cpu_to_be32(inode->i_nlink);
302         to->di_gen = cpu_to_be32(inode->i_generation);
303         to->di_mode = cpu_to_be16(inode->i_mode);
304 
305         to->di_size = cpu_to_be64(from->di_size);
306         to->di_nblocks = cpu_to_be64(from->di_nblocks);
307         to->di_extsize = cpu_to_be32(from->di_extsize);
308         to->di_nextents = cpu_to_be32(from->di_nextents);
309         to->di_anextents = cpu_to_be16(from->di_anextents);
310         to->di_forkoff = from->di_forkoff;
311         to->di_aformat = from->di_aformat;
312         to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
313         to->di_dmstate = cpu_to_be16(from->di_dmstate);
314         to->di_flags = cpu_to_be16(from->di_flags);
315 
316         if (from->di_version == 3) {
317                 to->di_changecount = cpu_to_be64(inode->i_version);
318                 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
319                 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
320                 to->di_flags2 = cpu_to_be64(from->di_flags2);
321                 to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
322                 to->di_ino = cpu_to_be64(ip->i_ino);
323                 to->di_lsn = cpu_to_be64(lsn);
324                 memset(to->di_pad2, 0, sizeof(to->di_pad2));
325                 uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
326                 to->di_flushiter = 0;
327         } else {
328                 to->di_flushiter = cpu_to_be16(from->di_flushiter);
329         }
330 }
331 
332 void
333 xfs_log_dinode_to_disk(
334         struct xfs_log_dinode   *from,
335         struct xfs_dinode       *to)
336 {
337         to->di_magic = cpu_to_be16(from->di_magic);
338         to->di_mode = cpu_to_be16(from->di_mode);
339         to->di_version = from->di_version;
340         to->di_format = from->di_format;
341         to->di_onlink = 0;
342         to->di_uid = cpu_to_be32(from->di_uid);
343         to->di_gid = cpu_to_be32(from->di_gid);
344         to->di_nlink = cpu_to_be32(from->di_nlink);
345         to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
346         to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
347         memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
348 
349         to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
350         to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
351         to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
352         to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
353         to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
354         to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
355 
356         to->di_size = cpu_to_be64(from->di_size);
357         to->di_nblocks = cpu_to_be64(from->di_nblocks);
358         to->di_extsize = cpu_to_be32(from->di_extsize);
359         to->di_nextents = cpu_to_be32(from->di_nextents);
360         to->di_anextents = cpu_to_be16(from->di_anextents);
361         to->di_forkoff = from->di_forkoff;
362         to->di_aformat = from->di_aformat;
363         to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
364         to->di_dmstate = cpu_to_be16(from->di_dmstate);
365         to->di_flags = cpu_to_be16(from->di_flags);
366         to->di_gen = cpu_to_be32(from->di_gen);
367 
368         if (from->di_version == 3) {
369                 to->di_changecount = cpu_to_be64(from->di_changecount);
370                 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
371                 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
372                 to->di_flags2 = cpu_to_be64(from->di_flags2);
373                 to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
374                 to->di_ino = cpu_to_be64(from->di_ino);
375                 to->di_lsn = cpu_to_be64(from->di_lsn);
376                 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
377                 uuid_copy(&to->di_uuid, &from->di_uuid);
378                 to->di_flushiter = 0;
379         } else {
380                 to->di_flushiter = cpu_to_be16(from->di_flushiter);
381         }
382 }
383 
384 static bool
385 xfs_dinode_verify(
386         struct xfs_mount        *mp,
387         xfs_ino_t               ino,
388         struct xfs_dinode       *dip)
389 {
390         uint16_t                mode;
391         uint16_t                flags;
392         uint64_t                flags2;
393 
394         if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
395                 return false;
396 
397         /* don't allow invalid i_size */
398         if (be64_to_cpu(dip->di_size) & (1ULL << 63))
399                 return false;
400 
401         mode = be16_to_cpu(dip->di_mode);
402         if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN)
403                 return false;
404 
405         /* No zero-length symlinks/dirs. */
406         if ((S_ISLNK(mode) || S_ISDIR(mode)) && dip->di_size == 0)
407                 return false;
408 
409         /* only version 3 or greater inodes are extensively verified here */
410         if (dip->di_version < 3)
411                 return true;
412 
413         if (!xfs_sb_version_hascrc(&mp->m_sb))
414                 return false;
415         if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
416                               XFS_DINODE_CRC_OFF))
417                 return false;
418         if (be64_to_cpu(dip->di_ino) != ino)
419                 return false;
420         if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
421                 return false;
422 
423         flags = be16_to_cpu(dip->di_flags);
424         flags2 = be64_to_cpu(dip->di_flags2);
425 
426         /* don't allow reflink/cowextsize if we don't have reflink */
427         if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
428             !xfs_sb_version_hasreflink(&mp->m_sb))
429                 return false;
430 
431         /* don't let reflink and realtime mix */
432         if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
433                 return false;
434 
435         /* don't let reflink and dax mix */
436         if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX))
437                 return false;
438 
439         return true;
440 }
441 
442 void
443 xfs_dinode_calc_crc(
444         struct xfs_mount        *mp,
445         struct xfs_dinode       *dip)
446 {
447         __uint32_t              crc;
448 
449         if (dip->di_version < 3)
450                 return;
451 
452         ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
453         crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
454                               XFS_DINODE_CRC_OFF);
455         dip->di_crc = xfs_end_cksum(crc);
456 }
457 
458 /*
459  * Read the disk inode attributes into the in-core inode structure.
460  *
461  * For version 5 superblocks, if we are initialising a new inode and we are not
462  * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
463  * inode core with a random generation number. If we are keeping inodes around,
464  * we need to read the inode cluster to get the existing generation number off
465  * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
466  * format) then log recovery is dependent on the di_flushiter field being
467  * initialised from the current on-disk value and hence we must also read the
468  * inode off disk.
469  */
470 int
471 xfs_iread(
472         xfs_mount_t     *mp,
473         xfs_trans_t     *tp,
474         xfs_inode_t     *ip,
475         uint            iget_flags)
476 {
477         xfs_buf_t       *bp;
478         xfs_dinode_t    *dip;
479         int             error;
480 
481         /*
482          * Fill in the location information in the in-core inode.
483          */
484         error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
485         if (error)
486                 return error;
487 
488         /* shortcut IO on inode allocation if possible */
489         if ((iget_flags & XFS_IGET_CREATE) &&
490             xfs_sb_version_hascrc(&mp->m_sb) &&
491             !(mp->m_flags & XFS_MOUNT_IKEEP)) {
492                 /* initialise the on-disk inode core */
493                 memset(&ip->i_d, 0, sizeof(ip->i_d));
494                 VFS_I(ip)->i_generation = prandom_u32();
495                 if (xfs_sb_version_hascrc(&mp->m_sb))
496                         ip->i_d.di_version = 3;
497                 else
498                         ip->i_d.di_version = 2;
499                 return 0;
500         }
501 
502         /*
503          * Get pointers to the on-disk inode and the buffer containing it.
504          */
505         error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
506         if (error)
507                 return error;
508 
509         /* even unallocated inodes are verified */
510         if (!xfs_dinode_verify(mp, ip->i_ino, dip)) {
511                 xfs_alert(mp, "%s: validation failed for inode %lld failed",
512                                 __func__, ip->i_ino);
513 
514                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, dip);
515                 error = -EFSCORRUPTED;
516                 goto out_brelse;
517         }
518 
519         /*
520          * If the on-disk inode is already linked to a directory
521          * entry, copy all of the inode into the in-core inode.
522          * xfs_iformat_fork() handles copying in the inode format
523          * specific information.
524          * Otherwise, just get the truly permanent information.
525          */
526         if (dip->di_mode) {
527                 xfs_inode_from_disk(ip, dip);
528                 error = xfs_iformat_fork(ip, dip);
529                 if (error)  {
530 #ifdef DEBUG
531                         xfs_alert(mp, "%s: xfs_iformat() returned error %d",
532                                 __func__, error);
533 #endif /* DEBUG */
534                         goto out_brelse;
535                 }
536         } else {
537                 /*
538                  * Partial initialisation of the in-core inode. Just the bits
539                  * that xfs_ialloc won't overwrite or relies on being correct.
540                  */
541                 ip->i_d.di_version = dip->di_version;
542                 VFS_I(ip)->i_generation = be32_to_cpu(dip->di_gen);
543                 ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
544 
545                 /*
546                  * Make sure to pull in the mode here as well in
547                  * case the inode is released without being used.
548                  * This ensures that xfs_inactive() will see that
549                  * the inode is already free and not try to mess
550                  * with the uninitialized part of it.
551                  */
552                 VFS_I(ip)->i_mode = 0;
553         }
554 
555         ASSERT(ip->i_d.di_version >= 2);
556         ip->i_delayed_blks = 0;
557 
558         /*
559          * Mark the buffer containing the inode as something to keep
560          * around for a while.  This helps to keep recently accessed
561          * meta-data in-core longer.
562          */
563         xfs_buf_set_ref(bp, XFS_INO_REF);
564 
565         /*
566          * Use xfs_trans_brelse() to release the buffer containing the on-disk
567          * inode, because it was acquired with xfs_trans_read_buf() in
568          * xfs_imap_to_bp() above.  If tp is NULL, this is just a normal
569          * brelse().  If we're within a transaction, then xfs_trans_brelse()
570          * will only release the buffer if it is not dirty within the
571          * transaction.  It will be OK to release the buffer in this case,
572          * because inodes on disk are never destroyed and we will be locking the
573          * new in-core inode before putting it in the cache where other
574          * processes can find it.  Thus we don't have to worry about the inode
575          * being changed just because we released the buffer.
576          */
577  out_brelse:
578         xfs_trans_brelse(tp, bp);
579         return error;
580 }
581 

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