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);
204 xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
210 *dipp = xfs_buf_offset(bp, imap->im_boffset);
216 struct xfs_inode *ip,
217 struct xfs_dinode *from)
219 struct xfs_icdinode *to = &ip->i_d;
220 struct inode *inode = VFS_I(ip);
224 * Convert v1 inodes immediately to v2 inode format as this is the
225 * minimum inode version format we support in the rest of the code.
227 to->di_version = from->di_version;
228 if (to->di_version == 1) {
229 set_nlink(inode, be16_to_cpu(from->di_onlink));
230 to->di_projid_lo = 0;
231 to->di_projid_hi = 0;
234 set_nlink(inode, be32_to_cpu(from->di_nlink));
235 to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
236 to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
239 to->di_format = from->di_format;
240 to->di_uid = be32_to_cpu(from->di_uid);
241 to->di_gid = be32_to_cpu(from->di_gid);
242 to->di_flushiter = be16_to_cpu(from->di_flushiter);
245 * Time is signed, so need to convert to signed 32 bit before
246 * storing in inode timestamp which may be 64 bit. Otherwise
247 * a time before epoch is converted to a time long after epoch
250 inode->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec);
251 inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec);
252 inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec);
253 inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec);
254 inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec);
255 inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec);
256 inode->i_generation = be32_to_cpu(from->di_gen);
257 inode->i_mode = be16_to_cpu(from->di_mode);
259 to->di_size = be64_to_cpu(from->di_size);
260 to->di_nblocks = be64_to_cpu(from->di_nblocks);
261 to->di_extsize = be32_to_cpu(from->di_extsize);
262 to->di_nextents = be32_to_cpu(from->di_nextents);
263 to->di_anextents = be16_to_cpu(from->di_anextents);
264 to->di_forkoff = from->di_forkoff;
265 to->di_aformat = from->di_aformat;
266 to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
267 to->di_dmstate = be16_to_cpu(from->di_dmstate);
268 to->di_flags = be16_to_cpu(from->di_flags);
270 if (to->di_version == 3) {
271 inode_set_iversion_queried(inode,
272 be64_to_cpu(from->di_changecount));
273 to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
274 to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
275 to->di_flags2 = be64_to_cpu(from->di_flags2);
276 to->di_cowextsize = be32_to_cpu(from->di_cowextsize);
282 struct xfs_inode *ip,
283 struct xfs_dinode *to,
286 struct xfs_icdinode *from = &ip->i_d;
287 struct inode *inode = VFS_I(ip);
289 to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
292 to->di_version = from->di_version;
293 to->di_format = from->di_format;
294 to->di_uid = cpu_to_be32(from->di_uid);
295 to->di_gid = cpu_to_be32(from->di_gid);
296 to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
297 to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
299 memset(to->di_pad, 0, sizeof(to->di_pad));
300 to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec);
301 to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
302 to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec);
303 to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
304 to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
305 to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
306 to->di_nlink = cpu_to_be32(inode->i_nlink);
307 to->di_gen = cpu_to_be32(inode->i_generation);
308 to->di_mode = cpu_to_be16(inode->i_mode);
310 to->di_size = cpu_to_be64(from->di_size);
311 to->di_nblocks = cpu_to_be64(from->di_nblocks);
312 to->di_extsize = cpu_to_be32(from->di_extsize);
313 to->di_nextents = cpu_to_be32(from->di_nextents);
314 to->di_anextents = cpu_to_be16(from->di_anextents);
315 to->di_forkoff = from->di_forkoff;
316 to->di_aformat = from->di_aformat;
317 to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
318 to->di_dmstate = cpu_to_be16(from->di_dmstate);
319 to->di_flags = cpu_to_be16(from->di_flags);
321 if (from->di_version == 3) {
322 to->di_changecount = cpu_to_be64(inode_peek_iversion(inode));
323 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
324 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
325 to->di_flags2 = cpu_to_be64(from->di_flags2);
326 to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
327 to->di_ino = cpu_to_be64(ip->i_ino);
328 to->di_lsn = cpu_to_be64(lsn);
329 memset(to->di_pad2, 0, sizeof(to->di_pad2));
330 uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
331 to->di_flushiter = 0;
333 to->di_flushiter = cpu_to_be16(from->di_flushiter);
338 xfs_log_dinode_to_disk(
339 struct xfs_log_dinode *from,
340 struct xfs_dinode *to)
342 to->di_magic = cpu_to_be16(from->di_magic);
343 to->di_mode = cpu_to_be16(from->di_mode);
344 to->di_version = from->di_version;
345 to->di_format = from->di_format;
347 to->di_uid = cpu_to_be32(from->di_uid);
348 to->di_gid = cpu_to_be32(from->di_gid);
349 to->di_nlink = cpu_to_be32(from->di_nlink);
350 to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
351 to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
352 memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
354 to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
355 to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
356 to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
357 to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
358 to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
359 to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
361 to->di_size = cpu_to_be64(from->di_size);
362 to->di_nblocks = cpu_to_be64(from->di_nblocks);
363 to->di_extsize = cpu_to_be32(from->di_extsize);
364 to->di_nextents = cpu_to_be32(from->di_nextents);
365 to->di_anextents = cpu_to_be16(from->di_anextents);
366 to->di_forkoff = from->di_forkoff;
367 to->di_aformat = from->di_aformat;
368 to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
369 to->di_dmstate = cpu_to_be16(from->di_dmstate);
370 to->di_flags = cpu_to_be16(from->di_flags);
371 to->di_gen = cpu_to_be32(from->di_gen);
373 if (from->di_version == 3) {
374 to->di_changecount = cpu_to_be64(from->di_changecount);
375 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
376 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
377 to->di_flags2 = cpu_to_be64(from->di_flags2);
378 to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
379 to->di_ino = cpu_to_be64(from->di_ino);
380 to->di_lsn = cpu_to_be64(from->di_lsn);
381 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
382 uuid_copy(&to->di_uuid, &from->di_uuid);
383 to->di_flushiter = 0;
385 to->di_flushiter = cpu_to_be16(from->di_flushiter);
391 struct xfs_mount *mp,
393 struct xfs_dinode *dip)
401 if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
402 return __this_address;
404 /* Verify v3 integrity information first */
405 if (dip->di_version >= 3) {
406 if (!xfs_sb_version_hascrc(&mp->m_sb))
407 return __this_address;
408 if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
410 return __this_address;
411 if (be64_to_cpu(dip->di_ino) != ino)
412 return __this_address;
413 if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
414 return __this_address;
417 /* don't allow invalid i_size */
418 di_size = be64_to_cpu(dip->di_size);
419 if (di_size & (1ULL << 63))
420 return __this_address;
422 mode = be16_to_cpu(dip->di_mode);
423 if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN)
424 return __this_address;
426 /* No zero-length symlinks/dirs. */
427 if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0)
428 return __this_address;
430 /* Fork checks carried over from xfs_iformat_fork */
432 be32_to_cpu(dip->di_nextents) + be16_to_cpu(dip->di_anextents) >
433 be64_to_cpu(dip->di_nblocks))
434 return __this_address;
436 if (mode && XFS_DFORK_BOFF(dip) > mp->m_sb.sb_inodesize)
437 return __this_address;
439 flags = be16_to_cpu(dip->di_flags);
441 if (mode && (flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
442 return __this_address;
444 /* Do we have appropriate data fork formats for the mode? */
445 switch (mode & S_IFMT) {
450 if (dip->di_format != XFS_DINODE_FMT_DEV)
451 return __this_address;
456 switch (dip->di_format) {
457 case XFS_DINODE_FMT_LOCAL:
459 * no local regular files yet
462 return __this_address;
463 if (di_size > XFS_DFORK_DSIZE(dip, mp))
464 return __this_address;
465 if (dip->di_nextents)
466 return __this_address;
468 case XFS_DINODE_FMT_EXTENTS:
469 case XFS_DINODE_FMT_BTREE:
472 return __this_address;
476 /* Uninitialized inode ok. */
479 return __this_address;
482 if (XFS_DFORK_Q(dip)) {
483 switch (dip->di_aformat) {
484 case XFS_DINODE_FMT_LOCAL:
485 if (dip->di_anextents)
486 return __this_address;
488 case XFS_DINODE_FMT_EXTENTS:
489 case XFS_DINODE_FMT_BTREE:
492 return __this_address;
496 * If there is no fork offset, this may be a freshly-made inode
497 * in a new disk cluster, in which case di_aformat is zeroed.
498 * Otherwise, such an inode must be in EXTENTS format; this goes
499 * for freed inodes as well.
501 switch (dip->di_aformat) {
503 case XFS_DINODE_FMT_EXTENTS:
506 return __this_address;
508 if (dip->di_anextents)
509 return __this_address;
512 /* extent size hint validation */
513 fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
518 /* only version 3 or greater inodes are extensively verified here */
519 if (dip->di_version < 3)
522 flags2 = be64_to_cpu(dip->di_flags2);
524 /* don't allow reflink/cowextsize if we don't have reflink */
525 if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
526 !xfs_sb_version_hasreflink(&mp->m_sb))
527 return __this_address;
529 /* only regular files get reflink */
530 if ((flags2 & XFS_DIFLAG2_REFLINK) && (mode & S_IFMT) != S_IFREG)
531 return __this_address;
533 /* don't let reflink and realtime mix */
534 if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
535 return __this_address;
537 /* don't let reflink and dax mix */
538 if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX))
539 return __this_address;
541 /* COW extent size hint validation */
542 fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
543 mode, flags, flags2);
552 struct xfs_mount *mp,
553 struct xfs_dinode *dip)
557 if (dip->di_version < 3)
560 ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
561 crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
563 dip->di_crc = xfs_end_cksum(crc);
567 * Read the disk inode attributes into the in-core inode structure.
569 * For version 5 superblocks, if we are initialising a new inode and we are not
570 * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
571 * inode core with a random generation number. If we are keeping inodes around,
572 * we need to read the inode cluster to get the existing generation number off
573 * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
574 * format) then log recovery is dependent on the di_flushiter field being
575 * initialised from the current on-disk value and hence we must also read the
591 * Fill in the location information in the in-core inode.
593 error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
597 /* shortcut IO on inode allocation if possible */
598 if ((iget_flags & XFS_IGET_CREATE) &&
599 xfs_sb_version_hascrc(&mp->m_sb) &&
600 !(mp->m_flags & XFS_MOUNT_IKEEP)) {
601 /* initialise the on-disk inode core */
602 memset(&ip->i_d, 0, sizeof(ip->i_d));
603 VFS_I(ip)->i_generation = prandom_u32();
604 ip->i_d.di_version = 3;
609 * Get pointers to the on-disk inode and the buffer containing it.
611 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
615 /* even unallocated inodes are verified */
616 fa = xfs_dinode_verify(mp, ip->i_ino, dip);
618 xfs_inode_verifier_error(ip, -EFSCORRUPTED, "dinode", dip,
620 error = -EFSCORRUPTED;
625 * If the on-disk inode is already linked to a directory
626 * entry, copy all of the inode into the in-core inode.
627 * xfs_iformat_fork() handles copying in the inode format
628 * specific information.
629 * Otherwise, just get the truly permanent information.
632 xfs_inode_from_disk(ip, dip);
633 error = xfs_iformat_fork(ip, dip);
636 xfs_alert(mp, "%s: xfs_iformat() returned error %d",
643 * Partial initialisation of the in-core inode. Just the bits
644 * that xfs_ialloc won't overwrite or relies on being correct.
646 ip->i_d.di_version = dip->di_version;
647 VFS_I(ip)->i_generation = be32_to_cpu(dip->di_gen);
648 ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
651 * Make sure to pull in the mode here as well in
652 * case the inode is released without being used.
653 * This ensures that xfs_inactive() will see that
654 * the inode is already free and not try to mess
655 * with the uninitialized part of it.
657 VFS_I(ip)->i_mode = 0;
660 ASSERT(ip->i_d.di_version >= 2);
661 ip->i_delayed_blks = 0;
664 * Mark the buffer containing the inode as something to keep
665 * around for a while. This helps to keep recently accessed
666 * meta-data in-core longer.
668 xfs_buf_set_ref(bp, XFS_INO_REF);
671 * Use xfs_trans_brelse() to release the buffer containing the on-disk
672 * inode, because it was acquired with xfs_trans_read_buf() in
673 * xfs_imap_to_bp() above. If tp is NULL, this is just a normal
674 * brelse(). If we're within a transaction, then xfs_trans_brelse()
675 * will only release the buffer if it is not dirty within the
676 * transaction. It will be OK to release the buffer in this case,
677 * because inodes on disk are never destroyed and we will be locking the
678 * new in-core inode before putting it in the cache where other
679 * processes can find it. Thus we don't have to worry about the inode
680 * being changed just because we released the buffer.
683 xfs_trans_brelse(tp, bp);
688 * Validate di_extsize hint.
690 * The rules are documented at xfs_ioctl_setattr_check_extsize().
691 * These functions must be kept in sync with each other.
694 xfs_inode_validate_extsize(
695 struct xfs_mount *mp,
703 uint32_t extsize_bytes;
704 uint32_t blocksize_bytes;
706 rt_flag = (flags & XFS_DIFLAG_REALTIME);
707 hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
708 inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
709 extsize_bytes = XFS_FSB_TO_B(mp, extsize);
712 blocksize_bytes = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
714 blocksize_bytes = mp->m_sb.sb_blocksize;
716 if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
717 return __this_address;
719 if (hint_flag && !S_ISREG(mode))
720 return __this_address;
722 if (inherit_flag && !S_ISDIR(mode))
723 return __this_address;
725 if ((hint_flag || inherit_flag) && extsize == 0)
726 return __this_address;
728 if (!(hint_flag || inherit_flag) && extsize != 0)
729 return __this_address;
731 if (extsize_bytes % blocksize_bytes)
732 return __this_address;
734 if (extsize > MAXEXTLEN)
735 return __this_address;
737 if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
738 return __this_address;
744 * Validate di_cowextsize hint.
746 * The rules are documented at xfs_ioctl_setattr_check_cowextsize().
747 * These functions must be kept in sync with each other.
750 xfs_inode_validate_cowextsize(
751 struct xfs_mount *mp,
759 uint32_t cowextsize_bytes;
761 rt_flag = (flags & XFS_DIFLAG_REALTIME);
762 hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
763 cowextsize_bytes = XFS_FSB_TO_B(mp, cowextsize);
765 if (hint_flag && !xfs_sb_version_hasreflink(&mp->m_sb))
766 return __this_address;
768 if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
769 return __this_address;
771 if (hint_flag && cowextsize == 0)
772 return __this_address;
774 if (!hint_flag && cowextsize != 0)
775 return __this_address;
777 if (hint_flag && rt_flag)
778 return __this_address;
780 if (cowextsize_bytes % mp->m_sb.sb_blocksize)
781 return __this_address;
783 if (cowextsize > MAXEXTLEN)
784 return __this_address;
786 if (cowextsize > mp->m_sb.sb_agblocks / 2)
787 return __this_address;