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xfs: allow overlapping rtrmapbt records for shared data extents

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Allow overlapping realtime reverse mapping records if they both describe
shared data extents and the fs supports reflink on the realtime volume.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong
2024-11-20 16:21:07 -08:00
parent 91683bb3f2
commit 2d9a3e9805
1 changed files with 16 additions and 1 deletions
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17
fs/xfs/scrub/rtrmap.c
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@@ -78,6 +78,18 @@ struct xchk_rtrmap {
struct xfs_rmap_irec prev_rec;
};
static inline bool
xchk_rtrmapbt_is_shareable(
struct xfs_scrub *sc,
const struct xfs_rmap_irec *irec)
{
if (!xfs_has_rtreflink(sc->mp))
return false;
if (irec->rm_flags & XFS_RMAP_UNWRITTEN)
return false;
return true;
}
/* Flag failures for records that overlap but cannot. */
STATIC void
xchk_rtrmapbt_check_overlapping(
@@ -99,7 +111,10 @@ xchk_rtrmapbt_check_overlapping(
if (pnext <= irec->rm_startblock)
goto set_prev;
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
/* Overlap is only allowed if both records are data fork mappings. */
if (!xchk_rtrmapbt_is_shareable(bs->sc, &cr->overlap_rec) ||
!xchk_rtrmapbt_is_shareable(bs->sc, irec))
xchk_btree_set_corrupt(bs->sc, bs->cur, 0);
/* Save whichever rmap record extends furthest. */
inext = irec->rm_startblock + irec->rm_blockcount;