diff options
| -rw-r--r-- | fs/xfs/scrub/rmap.c | 74 |
1 files changed, 72 insertions, 2 deletions
diff --git a/fs/xfs/scrub/rmap.c b/fs/xfs/scrub/rmap.c index 18b64287158e..f7e0384a0e69 100644 --- a/fs/xfs/scrub/rmap.c +++ b/fs/xfs/scrub/rmap.c @@ -32,6 +32,15 @@ xchk_setup_ag_rmapbt( /* Reverse-mapping scrubber. */ +struct xchk_rmap { + /* + * The furthest-reaching of the rmapbt records that we've already + * processed. This enables us to detect overlapping records for space + * allocations that cannot be shared. + */ + struct xfs_rmap_irec overlap_rec; +}; + /* Cross-reference a rmap against the refcount btree. */ STATIC void xchk_rmapbt_xref_refc( @@ -139,12 +148,63 @@ xchk_rmapbt_check_unwritten_in_keyflags( } } +static inline bool +xchk_rmapbt_is_shareable( + struct xfs_scrub *sc, + const struct xfs_rmap_irec *irec) +{ + if (!xfs_has_reflink(sc->mp)) + return false; + if (XFS_RMAP_NON_INODE_OWNER(irec->rm_owner)) + return false; + if (irec->rm_flags & (XFS_RMAP_BMBT_BLOCK | XFS_RMAP_ATTR_FORK | + XFS_RMAP_UNWRITTEN)) + return false; + return true; +} + +/* Flag failures for records that overlap but cannot. */ +STATIC void +xchk_rmapbt_check_overlapping( + struct xchk_btree *bs, + struct xchk_rmap *cr, + const struct xfs_rmap_irec *irec) +{ + xfs_agblock_t pnext, inext; + + if (bs->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT) + return; + + /* No previous record? */ + if (cr->overlap_rec.rm_blockcount == 0) + goto set_prev; + + /* Do overlap_rec and irec overlap? */ + pnext = cr->overlap_rec.rm_startblock + cr->overlap_rec.rm_blockcount; + if (pnext <= irec->rm_startblock) + goto set_prev; + + /* Overlap is only allowed if both records are data fork mappings. */ + if (!xchk_rmapbt_is_shareable(bs->sc, &cr->overlap_rec) || + !xchk_rmapbt_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; + if (pnext > inext) + return; + +set_prev: + memcpy(&cr->overlap_rec, irec, sizeof(struct xfs_rmap_irec)); +} + /* Scrub an rmapbt record. */ STATIC int xchk_rmapbt_rec( struct xchk_btree *bs, const union xfs_btree_rec *rec) { + struct xchk_rmap *cr = bs->private; struct xfs_rmap_irec irec; if (xfs_rmap_btrec_to_irec(rec, &irec) != NULL || @@ -154,6 +214,7 @@ xchk_rmapbt_rec( } xchk_rmapbt_check_unwritten_in_keyflags(bs); + xchk_rmapbt_check_overlapping(bs, cr, &irec); xchk_rmapbt_xref(bs->sc, &irec); return 0; } @@ -163,8 +224,17 @@ int xchk_rmapbt( struct xfs_scrub *sc) { - return xchk_btree(sc, sc->sa.rmap_cur, xchk_rmapbt_rec, - &XFS_RMAP_OINFO_AG, NULL); + struct xchk_rmap *cr; + int error; + + cr = kzalloc(sizeof(struct xchk_rmap), XCHK_GFP_FLAGS); + if (!cr) + return -ENOMEM; + + error = xchk_btree(sc, sc->sa.rmap_cur, xchk_rmapbt_rec, + &XFS_RMAP_OINFO_AG, cr); + kfree(cr); + return error; } /* xref check that the extent is owned only by a given owner */ |