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xfs: cross-reference refcount btree during scrub

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During metadata btree scrub, we should cross-reference with the
reference counts.

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 18:53:09 -08:00
parent dbde19da96
commit f6d5fc21fd
8 changed files with 186 additions and 14 deletions
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67
fs/xfs/scrub/refcount.c
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@@ -31,6 +31,7 @@
#include "xfs_sb.h"
#include "xfs_alloc.h"
#include "xfs_rmap.h"
#include "xfs_refcount.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
@@ -446,3 +447,69 @@ xfs_scrub_refcountbt(
return 0;
}
/* xref check that a cow staging extent is marked in the refcountbt. */
void
xfs_scrub_xref_is_cow_staging(
struct xfs_scrub_context *sc,
xfs_agblock_t agbno,
xfs_extlen_t len)
{
struct xfs_refcount_irec rc;
bool has_cowflag;
int has_refcount;
int error;
if (!sc->sa.refc_cur)
return;
/* Find the CoW staging extent. */
error = xfs_refcount_lookup_le(sc->sa.refc_cur,
agbno + XFS_REFC_COW_START, &has_refcount);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.refc_cur))
return;
if (!has_refcount) {
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
return;
}
error = xfs_refcount_get_rec(sc->sa.refc_cur, &rc, &has_refcount);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.refc_cur))
return;
if (!has_refcount) {
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
return;
}
/* CoW flag must be set, refcount must be 1. */
has_cowflag = (rc.rc_startblock & XFS_REFC_COW_START);
if (!has_cowflag || rc.rc_refcount != 1)
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
/* Must be at least as long as what was passed in */
if (rc.rc_blockcount < len)
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
}
/*
* xref check that the extent is not shared. Only file data blocks
* can have multiple owners.
*/
void
xfs_scrub_xref_is_not_shared(
struct xfs_scrub_context *sc,
xfs_agblock_t agbno,
xfs_extlen_t len)
{
bool shared;
int error;
if (!sc->sa.refc_cur)
return;
error = xfs_refcount_has_record(sc->sa.refc_cur, agbno, len, &shared);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.refc_cur))
return;
if (shared)
xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0);
}