From f4e38042b87d05f46bdc04d9811fb6bf76b42b0d Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 23 Sep 2024 13:42:44 -0700 Subject: [PATCH] xfs: allow overlapping rtrmapbt records for shared data extents 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 --- fs/xfs/scrub/rtrmap.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/fs/xfs/scrub/rtrmap.c b/fs/xfs/scrub/rtrmap.c index 6add6378289d..dc464749fbe3 100644 --- a/fs/xfs/scrub/rtrmap.c +++ b/fs/xfs/scrub/rtrmap.c @@ -79,6 +79,18 @@ 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( @@ -100,7 +112,10 @@ 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; -- 2.50.1