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xfs: change bmap scrubber to store the previous mapping

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Convert the inode data/attr/cow fork scrubber to remember the entire
previous mapping, not just the next expected offset.  No behavior
changes here, but this will enable some better checking in subsequent
patches.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2023-04-11 19:00:23 -07:00
parent 1fc7a0597d
commit 971ee3a670
1 changed files with 18 additions and 5 deletions
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23
fs/xfs/scrub/bmap.c
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@ -96,11 +96,23 @@ out:
struct xchk_bmap_info {
struct xfs_scrub *sc;
/* Incore extent tree cursor */
struct xfs_iext_cursor icur;
xfs_fileoff_t lastoff;
/* Previous fork mapping that we examined */
struct xfs_bmbt_irec prev_rec;
/* Is this a realtime fork? */
bool is_rt;
/* May mappings point to shared space? */
bool is_shared;
/* Was the incore extent tree loaded? */
bool was_loaded;
/* Which inode fork are we checking? */
int whichfork;
};
@ -405,7 +417,8 @@ xchk_bmap_iextent(
* Check for out-of-order extents. This record could have come
* from the incore list, for which there is no ordering check.
*/
if (irec->br_startoff < info->lastoff)
if (irec->br_startoff < info->prev_rec.br_startoff +
info->prev_rec.br_blockcount)
xchk_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
@ -712,7 +725,8 @@ xchk_bmap_iextent_delalloc(
* Check for out-of-order extents. This record could have come
* from the incore list, for which there is no ordering check.
*/
if (irec->br_startoff < info->lastoff)
if (irec->br_startoff < info->prev_rec.br_startoff +
info->prev_rec.br_blockcount)
xchk_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
@ -806,7 +820,6 @@ xchk_bmap(
goto out;
/* Scrub extent records. */
info.lastoff = 0;
ifp = xfs_ifork_ptr(ip, whichfork);
for_each_xfs_iext(ifp, &info.icur, &irec) {
if (xchk_should_terminate(sc, &error) ||
@ -823,7 +836,7 @@ xchk_bmap(
xchk_bmap_iextent_delalloc(ip, &info, &irec);
else
xchk_bmap_iextent(ip, &info, &irec);
info.lastoff = irec.br_startoff + irec.br_blockcount;
memcpy(&info.prev_rec, &irec, sizeof(struct xfs_bmbt_irec));
}
error = xchk_bmap_check_rmaps(sc, whichfork);