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xfs: check for shared rt extents when rebuilding rt file's data fork

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When we're rebuilding the data fork of a realtime file, we need to
cross-reference each mapping with the rt refcount btree to ensure that
the reflink flag is set if there are any shared extents found.

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 16:21:15 -08:00
parent 92b2019493
commit 12f4d20328
1 changed files with 13 additions and 8 deletions
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21
fs/xfs/scrub/bmap_repair.c
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@ -101,14 +101,21 @@ xrep_bmap_discover_shared(
xfs_filblks_t blockcount)
{
struct xfs_scrub *sc = rb->sc;
struct xfs_btree_cur *cur;
xfs_agblock_t agbno;
xfs_agblock_t fbno;
xfs_extlen_t flen;
int error;
agbno = XFS_FSB_TO_AGBNO(sc->mp, startblock);
error = xfs_refcount_find_shared(sc->sa.refc_cur, agbno, blockcount,
&fbno, &flen, false);
if (XFS_IS_REALTIME_INODE(sc->ip)) {
agbno = xfs_rtb_to_rgbno(sc->mp, startblock);
cur = sc->sr.refc_cur;
} else {
agbno = XFS_FSB_TO_AGBNO(sc->mp, startblock);
cur = sc->sa.refc_cur;
}
error = xfs_refcount_find_shared(cur, agbno, blockcount, &fbno, &flen,
false);
if (error)
return error;
@ -450,7 +457,9 @@ xrep_bmap_scan_rtgroup(
return 0;
error = xrep_rtgroup_init(sc, rtg, &sc->sr,
XFS_RTGLOCK_RMAP | XFS_RTGLOCK_BITMAP_SHARED);
XFS_RTGLOCK_RMAP |
XFS_RTGLOCK_REFCOUNT |
XFS_RTGLOCK_BITMAP_SHARED);
if (error)
return error;
@ -903,10 +912,6 @@ xrep_bmap_init_reflink_scan(
if (whichfork != XFS_DATA_FORK)
return RLS_IRRELEVANT;
/* cannot share realtime extents */
if (XFS_IS_REALTIME_INODE(sc->ip))
return RLS_IRRELEVANT;
return RLS_UNKNOWN;
}