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xfs: cross-reference reverse-mapping btree

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When scrubbing various btrees, we should cross-reference the records
with the reverse mapping btree and ensure that traversing the btree
finds the same number of blocks that the rmapbt thinks are owned by
that btree.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong
2018-01-16 18:53:08 -08:00
parent 2e6f27561b
commit d852657ccf
10 changed files with 440 additions and 4 deletions
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65
fs/xfs/scrub/rmap.c
View File

@@ -157,3 +157,68 @@ xfs_scrub_rmapbt(
return xfs_scrub_btree(sc, sc->sa.rmap_cur, xfs_scrub_rmapbt_rec,
&oinfo, NULL);
}
/* xref check that the extent is owned by a given owner */
static inline void
xfs_scrub_xref_check_owner(
struct xfs_scrub_context *sc,
xfs_agblock_t bno,
xfs_extlen_t len,
struct xfs_owner_info *oinfo,
bool should_have_rmap)
{
bool has_rmap;
int error;
if (!sc->sa.rmap_cur)
return;
error = xfs_rmap_record_exists(sc->sa.rmap_cur, bno, len, oinfo,
&has_rmap);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.rmap_cur))
return;
if (has_rmap != should_have_rmap)
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
}
/* xref check that the extent is owned by a given owner */
void
xfs_scrub_xref_is_owned_by(
struct xfs_scrub_context *sc,
xfs_agblock_t bno,
xfs_extlen_t len,
struct xfs_owner_info *oinfo)
{
xfs_scrub_xref_check_owner(sc, bno, len, oinfo, true);
}
/* xref check that the extent is not owned by a given owner */
void
xfs_scrub_xref_is_not_owned_by(
struct xfs_scrub_context *sc,
xfs_agblock_t bno,
xfs_extlen_t len,
struct xfs_owner_info *oinfo)
{
xfs_scrub_xref_check_owner(sc, bno, len, oinfo, false);
}
/* xref check that the extent has no reverse mapping at all */
void
xfs_scrub_xref_has_no_owner(
struct xfs_scrub_context *sc,
xfs_agblock_t bno,
xfs_extlen_t len)
{
bool has_rmap;
int error;
if (!sc->sa.rmap_cur)
return;
error = xfs_rmap_has_record(sc->sa.rmap_cur, bno, len, &has_rmap);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.rmap_cur))
return;
if (has_rmap)
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.rmap_cur, 0);
}