2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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.
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.
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
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_errortag.h"
28 #include "xfs_error.h"
29 #include "xfs_cksum.h"
30 #include "xfs_icache.h"
31 #include "xfs_trans.h"
32 #include "xfs_ialloc.h"
35 #include <linux/iversion.h>
38 * Check that none of the inode's in the buffer have a next
39 * unlinked field of 0.
51 j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
53 for (i = 0; i < j; i++) {
54 dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize);
55 if (!dip->di_next_unlinked) {
57 "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
58 i, (long long)bp->b_bn);
65 xfs_dinode_good_version(
69 if (xfs_sb_version_hascrc(&mp->m_sb))
72 return version == 1 || version == 2;
76 * If we are doing readahead on an inode buffer, we might be in log recovery
77 * reading an inode allocation buffer that hasn't yet been replayed, and hence
78 * has not had the inode cores stamped into it. Hence for readahead, the buffer
79 * may be potentially invalid.
81 * If the readahead buffer is invalid, we need to mark it with an error and
82 * clear the DONE status of the buffer so that a followup read will re-read it
83 * from disk. We don't report the error otherwise to avoid warnings during log
84 * recovery and we don't get unnecssary panics on debug kernels. We use EIO here
85 * because all we want to do is say readahead failed; there is no-one to report
86 * the error to, so this will distinguish it from a non-ra verifier failure.
87 * Changes to this readahead error behavour also need to be reflected in
88 * xfs_dquot_buf_readahead_verify().
95 struct xfs_mount *mp = bp->b_target->bt_mount;
101 * Validate the magic number and version of every inode in the buffer
103 agno = xfs_daddr_to_agno(mp, XFS_BUF_ADDR(bp));
104 ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
105 for (i = 0; i < ni; i++) {
108 xfs_agino_t unlinked_ino;
110 dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
111 unlinked_ino = be32_to_cpu(dip->di_next_unlinked);
112 di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
113 xfs_dinode_good_version(mp, dip->di_version) &&
114 (unlinked_ino == NULLAGINO ||
115 xfs_verify_agino(mp, agno, unlinked_ino));
116 if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
117 XFS_ERRTAG_ITOBP_INOTOBP))) {
119 bp->b_flags &= ~XBF_DONE;
120 xfs_buf_ioerror(bp, -EIO);
126 "bad inode magic/vsn daddr %lld #%d (magic=%x)",
127 (unsigned long long)bp->b_bn, i,
128 be16_to_cpu(dip->di_magic));
130 xfs_buf_verifier_error(bp, -EFSCORRUPTED,
131 __func__, dip, sizeof(*dip),
140 xfs_inode_buf_read_verify(
143 xfs_inode_buf_verify(bp, false);
147 xfs_inode_buf_readahead_verify(
150 xfs_inode_buf_verify(bp, true);
154 xfs_inode_buf_write_verify(
157 xfs_inode_buf_verify(bp, false);
160 const struct xfs_buf_ops xfs_inode_buf_ops = {
162 .verify_read = xfs_inode_buf_read_verify,
163 .verify_write = xfs_inode_buf_write_verify,
166 const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
167 .name = "xxfs_inode_ra",
168 .verify_read = xfs_inode_buf_readahead_verify,
169 .verify_write = xfs_inode_buf_write_verify,
174 * This routine is called to map an inode to the buffer containing the on-disk
175 * version of the inode. It returns a pointer to the buffer containing the
176 * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
177 * pointer to the on-disk inode within that buffer.
179 * If a non-zero error is returned, then the contents of bpp and dipp are
184 struct xfs_mount *mp,
185 struct xfs_trans *tp,
186 struct xfs_imap *imap,
187 struct xfs_dinode **dipp,
188 struct xfs_buf **bpp,
195 buf_flags |= XBF_UNMAPPED;
196 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
197 (int)imap->im_len, buf_flags, &bp,
200 if (error == -EAGAIN) {
201 ASSERT(buf_flags & XBF_TRYLOCK);
205 if (error == -EFSCORRUPTED &&
206 (iget_flags & XFS_IGET_UNTRUSTED))
209 xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
215 *dipp = xfs_buf_offset(bp, imap->im_boffset);
221 struct xfs_inode *ip,
222 struct xfs_dinode *from)
224 struct xfs_icdinode *to = &ip->i_d;
225 struct inode *inode = VFS_I(ip);
229 * Convert v1 inodes immediately to v2 inode format as this is the
230 * minimum inode version format we support in the rest of the code.
232 to->di_version = from->di_version;
233 if (to->di_version == 1) {
234 set_nlink(inode, be16_to_cpu(from->di_onlink));
235 to->di_projid_lo = 0;
236 to->di_projid_hi = 0;
239 set_nlink(inode, be32_to_cpu(from->di_nlink));
240 to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
241 to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
244 to->di_format = from->di_format;
245 to->di_uid = be32_to_cpu(from->di_uid);
246 to->di_gid = be32_to_cpu(from->di_gid);
247 to->di_flushiter = be16_to_cpu(from->di_flushiter);
250 * Time is signed, so need to convert to signed 32 bit before
251 * storing in inode timestamp which may be 64 bit. Otherwise
252 * a time before epoch is converted to a time long after epoch
255 inode->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec);
256 inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec);
257 inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec);
258 inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec);
259 inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec);
260 inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec);
261 inode->i_generation = be32_to_cpu(from->di_gen);
262 inode->i_mode = be16_to_cpu(from->di_mode);
264 to->di_size = be64_to_cpu(from->di_size);
265 to->di_nblocks = be64_to_cpu(from->di_nblocks);
266 to->di_extsize = be32_to_cpu(from->di_extsize);
267 to->di_nextents = be32_to_cpu(from->di_nextents);
268 to->di_anextents = be16_to_cpu(from->di_anextents);
269 to->di_forkoff = from->di_forkoff;
270 to->di_aformat = from->di_aformat;
271 to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
272 to->di_dmstate = be16_to_cpu(from->di_dmstate);
273 to->di_flags = be16_to_cpu(from->di_flags);
275 if (to->di_version == 3) {
276 inode_set_iversion_queried(inode,
277 be64_to_cpu(from->di_changecount));
278 to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
279 to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
280 to->di_flags2 = be64_to_cpu(from->di_flags2);
281 to->di_cowextsize = be32_to_cpu(from->di_cowextsize);
287 struct xfs_inode *ip,
288 struct xfs_dinode *to,
291 struct xfs_icdinode *from = &ip->i_d;
292 struct inode *inode = VFS_I(ip);
294 to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
297 to->di_version = from->di_version;
298 to->di_format = from->di_format;
299 to->di_uid = cpu_to_be32(from->di_uid);
300 to->di_gid = cpu_to_be32(from->di_gid);
301 to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
302 to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
304 memset(to->di_pad, 0, sizeof(to->di_pad));
305 to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec);
306 to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
307 to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec);
308 to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
309 to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
310 to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
311 to->di_nlink = cpu_to_be32(inode->i_nlink);
312 to->di_gen = cpu_to_be32(inode->i_generation);
313 to->di_mode = cpu_to_be16(inode->i_mode);
315 to->di_size = cpu_to_be64(from->di_size);
316 to->di_nblocks = cpu_to_be64(from->di_nblocks);
317 to->di_extsize = cpu_to_be32(from->di_extsize);
318 to->di_nextents = cpu_to_be32(from->di_nextents);
319 to->di_anextents = cpu_to_be16(from->di_anextents);
320 to->di_forkoff = from->di_forkoff;
321 to->di_aformat = from->di_aformat;
322 to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
323 to->di_dmstate = cpu_to_be16(from->di_dmstate);
324 to->di_flags = cpu_to_be16(from->di_flags);
326 if (from->di_version == 3) {
327 to->di_changecount = cpu_to_be64(inode_peek_iversion(inode));
328 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
329 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
330 to->di_flags2 = cpu_to_be64(from->di_flags2);
331 to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
332 to->di_ino = cpu_to_be64(ip->i_ino);
333 to->di_lsn = cpu_to_be64(lsn);
334 memset(to->di_pad2, 0, sizeof(to->di_pad2));
335 uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
336 to->di_flushiter = 0;
338 to->di_flushiter = cpu_to_be16(from->di_flushiter);
343 xfs_log_dinode_to_disk(
344 struct xfs_log_dinode *from,
345 struct xfs_dinode *to)
347 to->di_magic = cpu_to_be16(from->di_magic);
348 to->di_mode = cpu_to_be16(from->di_mode);
349 to->di_version = from->di_version;
350 to->di_format = from->di_format;
352 to->di_uid = cpu_to_be32(from->di_uid);
353 to->di_gid = cpu_to_be32(from->di_gid);
354 to->di_nlink = cpu_to_be32(from->di_nlink);
355 to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
356 to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
357 memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
359 to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
360 to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
361 to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
362 to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
363 to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
364 to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
366 to->di_size = cpu_to_be64(from->di_size);
367 to->di_nblocks = cpu_to_be64(from->di_nblocks);
368 to->di_extsize = cpu_to_be32(from->di_extsize);
369 to->di_nextents = cpu_to_be32(from->di_nextents);
370 to->di_anextents = cpu_to_be16(from->di_anextents);
371 to->di_forkoff = from->di_forkoff;
372 to->di_aformat = from->di_aformat;
373 to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
374 to->di_dmstate = cpu_to_be16(from->di_dmstate);
375 to->di_flags = cpu_to_be16(from->di_flags);
376 to->di_gen = cpu_to_be32(from->di_gen);
378 if (from->di_version == 3) {
379 to->di_changecount = cpu_to_be64(from->di_changecount);
380 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
381 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
382 to->di_flags2 = cpu_to_be64(from->di_flags2);
383 to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
384 to->di_ino = cpu_to_be64(from->di_ino);
385 to->di_lsn = cpu_to_be64(from->di_lsn);
386 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
387 uuid_copy(&to->di_uuid, &from->di_uuid);
388 to->di_flushiter = 0;
390 to->di_flushiter = cpu_to_be16(from->di_flushiter);
396 struct xfs_mount *mp,
398 struct xfs_dinode *dip)
406 if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
407 return __this_address;
409 /* Verify v3 integrity information first */
410 if (dip->di_version >= 3) {
411 if (!xfs_sb_version_hascrc(&mp->m_sb))
412 return __this_address;
413 if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
415 return __this_address;
416 if (be64_to_cpu(dip->di_ino) != ino)
417 return __this_address;
418 if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
419 return __this_address;
422 /* don't allow invalid i_size */
423 di_size = be64_to_cpu(dip->di_size);
424 if (di_size & (1ULL << 63))
425 return __this_address;
427 mode = be16_to_cpu(dip->di_mode);
428 if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN)
429 return __this_address;
431 /* No zero-length symlinks/dirs. */
432 if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0)
433 return __this_address;
435 /* Fork checks carried over from xfs_iformat_fork */
437 be32_to_cpu(dip->di_nextents) + be16_to_cpu(dip->di_anextents) >
438 be64_to_cpu(dip->di_nblocks))
439 return __this_address;
441 if (mode && XFS_DFORK_BOFF(dip) > mp->m_sb.sb_inodesize)
442 return __this_address;
444 flags = be16_to_cpu(dip->di_flags);
446 if (mode && (flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
447 return __this_address;
449 /* Do we have appropriate data fork formats for the mode? */
450 switch (mode & S_IFMT) {
455 if (dip->di_format != XFS_DINODE_FMT_DEV)
456 return __this_address;
461 switch (dip->di_format) {
462 case XFS_DINODE_FMT_LOCAL:
464 * no local regular files yet
467 return __this_address;
468 if (di_size > XFS_DFORK_DSIZE(dip, mp))
469 return __this_address;
470 if (dip->di_nextents)
471 return __this_address;
473 case XFS_DINODE_FMT_EXTENTS:
474 case XFS_DINODE_FMT_BTREE:
477 return __this_address;
481 /* Uninitialized inode ok. */
484 return __this_address;
487 if (XFS_DFORK_Q(dip)) {
488 switch (dip->di_aformat) {
489 case XFS_DINODE_FMT_LOCAL:
490 if (dip->di_anextents)
491 return __this_address;
493 case XFS_DINODE_FMT_EXTENTS:
494 case XFS_DINODE_FMT_BTREE:
497 return __this_address;
501 * If there is no fork offset, this may be a freshly-made inode
502 * in a new disk cluster, in which case di_aformat is zeroed.
503 * Otherwise, such an inode must be in EXTENTS format; this goes
504 * for freed inodes as well.
506 switch (dip->di_aformat) {
508 case XFS_DINODE_FMT_EXTENTS:
511 return __this_address;
513 if (dip->di_anextents)
514 return __this_address;
517 /* extent size hint validation */
518 fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
523 /* only version 3 or greater inodes are extensively verified here */
524 if (dip->di_version < 3)
527 flags2 = be64_to_cpu(dip->di_flags2);
529 /* don't allow reflink/cowextsize if we don't have reflink */
530 if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
531 !xfs_sb_version_hasreflink(&mp->m_sb))
532 return __this_address;
534 /* only regular files get reflink */
535 if ((flags2 & XFS_DIFLAG2_REFLINK) && (mode & S_IFMT) != S_IFREG)
536 return __this_address;
538 /* don't let reflink and realtime mix */
539 if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
540 return __this_address;
542 /* don't let reflink and dax mix */
543 if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX))
544 return __this_address;
546 /* COW extent size hint validation */
547 fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
548 mode, flags, flags2);
557 struct xfs_mount *mp,
558 struct xfs_dinode *dip)
562 if (dip->di_version < 3)
565 ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
566 crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
568 dip->di_crc = xfs_end_cksum(crc);
572 * Read the disk inode attributes into the in-core inode structure.
574 * For version 5 superblocks, if we are initialising a new inode and we are not
575 * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
576 * inode core with a random generation number. If we are keeping inodes around,
577 * we need to read the inode cluster to get the existing generation number off
578 * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
579 * format) then log recovery is dependent on the di_flushiter field being
580 * initialised from the current on-disk value and hence we must also read the
596 * Fill in the location information in the in-core inode.
598 error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
602 /* shortcut IO on inode allocation if possible */
603 if ((iget_flags & XFS_IGET_CREATE) &&
604 xfs_sb_version_hascrc(&mp->m_sb) &&
605 !(mp->m_flags & XFS_MOUNT_IKEEP)) {
606 /* initialise the on-disk inode core */
607 memset(&ip->i_d, 0, sizeof(ip->i_d));
608 VFS_I(ip)->i_generation = prandom_u32();
609 ip->i_d.di_version = 3;
614 * Get pointers to the on-disk inode and the buffer containing it.
616 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
620 /* even unallocated inodes are verified */
621 fa = xfs_dinode_verify(mp, ip->i_ino, dip);
623 xfs_inode_verifier_error(ip, -EFSCORRUPTED, "dinode", dip,
625 error = -EFSCORRUPTED;
630 * If the on-disk inode is already linked to a directory
631 * entry, copy all of the inode into the in-core inode.
632 * xfs_iformat_fork() handles copying in the inode format
633 * specific information.
634 * Otherwise, just get the truly permanent information.
637 xfs_inode_from_disk(ip, dip);
638 error = xfs_iformat_fork(ip, dip);
641 xfs_alert(mp, "%s: xfs_iformat() returned error %d",
648 * Partial initialisation of the in-core inode. Just the bits
649 * that xfs_ialloc won't overwrite or relies on being correct.
651 ip->i_d.di_version = dip->di_version;
652 VFS_I(ip)->i_generation = be32_to_cpu(dip->di_gen);
653 ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
656 * Make sure to pull in the mode here as well in
657 * case the inode is released without being used.
658 * This ensures that xfs_inactive() will see that
659 * the inode is already free and not try to mess
660 * with the uninitialized part of it.
662 VFS_I(ip)->i_mode = 0;
665 ASSERT(ip->i_d.di_version >= 2);
666 ip->i_delayed_blks = 0;
669 * Mark the buffer containing the inode as something to keep
670 * around for a while. This helps to keep recently accessed
671 * meta-data in-core longer.
673 xfs_buf_set_ref(bp, XFS_INO_REF);
676 * Use xfs_trans_brelse() to release the buffer containing the on-disk
677 * inode, because it was acquired with xfs_trans_read_buf() in
678 * xfs_imap_to_bp() above. If tp is NULL, this is just a normal
679 * brelse(). If we're within a transaction, then xfs_trans_brelse()
680 * will only release the buffer if it is not dirty within the
681 * transaction. It will be OK to release the buffer in this case,
682 * because inodes on disk are never destroyed and we will be locking the
683 * new in-core inode before putting it in the cache where other
684 * processes can find it. Thus we don't have to worry about the inode
685 * being changed just because we released the buffer.
688 xfs_trans_brelse(tp, bp);
693 * Validate di_extsize hint.
695 * The rules are documented at xfs_ioctl_setattr_check_extsize().
696 * These functions must be kept in sync with each other.
699 xfs_inode_validate_extsize(
700 struct xfs_mount *mp,
708 uint32_t extsize_bytes;
709 uint32_t blocksize_bytes;
711 rt_flag = (flags & XFS_DIFLAG_REALTIME);
712 hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
713 inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
714 extsize_bytes = XFS_FSB_TO_B(mp, extsize);
717 blocksize_bytes = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
719 blocksize_bytes = mp->m_sb.sb_blocksize;
721 if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
722 return __this_address;
724 if (hint_flag && !S_ISREG(mode))
725 return __this_address;
727 if (inherit_flag && !S_ISDIR(mode))
728 return __this_address;
730 if ((hint_flag || inherit_flag) && extsize == 0)
731 return __this_address;
733 if (!(hint_flag || inherit_flag) && extsize != 0)
734 return __this_address;
736 if (extsize_bytes % blocksize_bytes)
737 return __this_address;
739 if (extsize > MAXEXTLEN)
740 return __this_address;
742 if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
743 return __this_address;
749 * Validate di_cowextsize hint.
751 * The rules are documented at xfs_ioctl_setattr_check_cowextsize().
752 * These functions must be kept in sync with each other.
755 xfs_inode_validate_cowextsize(
756 struct xfs_mount *mp,
764 uint32_t cowextsize_bytes;
766 rt_flag = (flags & XFS_DIFLAG_REALTIME);
767 hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
768 cowextsize_bytes = XFS_FSB_TO_B(mp, cowextsize);
770 if (hint_flag && !xfs_sb_version_hasreflink(&mp->m_sb))
771 return __this_address;
773 if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
774 return __this_address;
776 if (hint_flag && cowextsize == 0)
777 return __this_address;
779 if (!hint_flag && cowextsize != 0)
780 return __this_address;
782 if (hint_flag && rt_flag)
783 return __this_address;
785 if (cowextsize_bytes % mp->m_sb.sb_blocksize)
786 return __this_address;
788 if (cowextsize > MAXEXTLEN)
789 return __this_address;
791 if (cowextsize > mp->m_sb.sb_agblocks / 2)
792 return __this_address;