[PATCH 3/8] xfs: quota scrub should use bmapbtd scrubber

Darrick J. Wong
2018-05-10T19:18:39Z

From: Darrick J. Wong <darrick.wong@oracle.com>

Replace the quota scrubber's open-coded data fork scrubber with a
redirected call to the bmapbtd scrubber. This strengthens the quota
scrub to include all the cross-referencing that it does.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/scrub/common.c | 57 ++++++++++++++++++++++++++++++++++
fs/xfs/scrub/common.h | 2 +
fs/xfs/scrub/quota.c | 83 ++++++++++++++++++++++++-------------------------
3 files changed, 99 insertions(+), 43 deletions(-)

diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index 2ac8576c4670..62b33c99efe4 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -44,6 +44,8 @@
#include "xfs_rmap_btree.h"
#include "xfs_log.h"
#include "xfs_trans_priv.h"
+#include "xfs_attr.h"
+#include "xfs_reflink.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
@@ -787,3 +789,58 @@ xfs_scrub_buffer_recheck(
sc->sm->sm_flags |= XFS_SCRUB_OFLAG_CORRUPT;
trace_xfs_scrub_block_error(sc, bp->b_bn, fa);
}
+
+/*
+ * Scrub the attr/data forks of a metadata inode. The metadata inode must be
+ * pointed to by sc->ip and the ILOCK must be held.
+ */
+int
+xfs_scrub_metadata_inode_forks(
+ struct xfs_scrub_context *sc)
+{
+ __u32 smtype;
+ bool shared;
+ int error;
+
+ if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
+ return 0;
+
+ /* Metadata inodes don't live on the rt device. */
+ if (sc->ip->i_d.di_flags & XFS_DIFLAG_REALTIME) {
+ xfs_scrub_ino_set_corrupt(sc, sc->ip->i_ino);
+ return 0;
+ }
+
+ /* They should never participate in reflink. */
+ if (xfs_is_reflink_inode(sc->ip)) {
+ xfs_scrub_ino_set_corrupt(sc, sc->ip->i_ino);
+ return 0;
+ }
+
+ /* They also should never have extended attributes. */
+ if (xfs_inode_hasattr(sc->ip)) {
+ xfs_scrub_ino_set_corrupt(sc, sc->ip->i_ino);
+ return 0;
+ }
+
+ /* Invoke the data fork scrubber. */
+ smtype = sc->sm->sm_type;
+ sc->sm->sm_type = XFS_SCRUB_TYPE_BMBTD;
+ error = xfs_scrub_bmap_data(sc);
+ sc->sm->sm_type = smtype;
+ if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
+ return error;
+
+ /* Look for incorrect shared blocks. */
+ if (xfs_sb_version_hasreflink(&sc->mp->m_sb)) {
+ error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip,
+ &shared);
+ if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, 0,
+ &error))
+ return error;
+ if (shared)
+ xfs_scrub_ino_set_corrupt(sc, sc->ip->i_ino);
+ }
+
+ return error;
+}
diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h
index a23ad7fa2b6c..5d78bb9602ab 100644
--- a/fs/xfs/scrub/common.h
+++ b/fs/xfs/scrub/common.h
@@ -155,4 +155,6 @@ static inline bool xfs_scrub_skip_xref(struct xfs_scrub_metadata *sm)
XFS_SCRUB_OFLAG_XCORRUPT);
}

+int xfs_scrub_metadata_inode_forks(struct xfs_scrub_context *sc);
+
#endif /* __XFS_SCRUB_COMMON_H__ */
diff --git a/fs/xfs/scrub/quota.c b/fs/xfs/scrub/quota.c
index d3d08978f53a..15ae4d23d6ac 100644
--- a/fs/xfs/scrub/quota.c
+++ b/fs/xfs/scrub/quota.c
@@ -206,65 +206,62 @@ xfs_scrub_quota_item(
return 0;
}

-/* Scrub all of a quota type's items. */
-int
-xfs_scrub_quota(
+/* Check the quota's data fork. */
+STATIC int
+xfs_scrub_quota_data_fork(
struct xfs_scrub_context *sc)
{
struct xfs_bmbt_irec irec = { 0 };
- struct xfs_scrub_quota_info sqi;
- struct xfs_mount *mp = sc->mp;
- struct xfs_quotainfo *qi = mp->m_quotainfo;
+ struct xfs_iext_cursor icur;
+ struct xfs_quotainfo *qi = sc->mp->m_quotainfo;
+ struct xfs_ifork *ifp;
xfs_fileoff_t max_dqid_off;
- xfs_fileoff_t off = 0;
- uint dqtype;
- int nimaps;
int error = 0;

- dqtype = xfs_scrub_quota_to_dqtype(sc);
+ /* Invoke the fork scrubber. */
+ error = xfs_scrub_metadata_inode_forks(sc);
+ if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
+ return error;

- /* Look for problem extents. */
- if (sc->ip->i_d.di_flags & XFS_DIFLAG_REALTIME) {
- xfs_scrub_ino_set_corrupt(sc, sc->ip->i_ino);
- goto out;
- }
+ /* Check for data fork problems that apply only to quota files. */
max_dqid_off = ((xfs_dqid_t)-1) / qi->qi_dqperchunk;
- while (1) {
+ ifp = XFS_IFORK_PTR(sc->ip, XFS_DATA_FORK);
+ for_each_xfs_iext(ifp, &icur, &irec) {
if (xfs_scrub_should_terminate(sc, &error))
break;
-
- off = irec.br_startoff + irec.br_blockcount;
- nimaps = 1;
- error = xfs_bmapi_read(sc->ip, off, -1, &irec, &nimaps,
- XFS_BMAPI_ENTIRE);
- if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, off,
- &error))
- goto out;
- if (!nimaps)
- break;
- if (irec.br_startblock == HOLESTARTBLOCK)
- continue;
-
- /* Check the extent record doesn't point to crap. */
- if (irec.br_startblock + irec.br_blockcount <=
- irec.br_startblock)
- xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK,
- irec.br_startoff);
- if (!xfs_verify_fsbno(mp, irec.br_startblock) ||
- !xfs_verify_fsbno(mp, irec.br_startblock +
- irec.br_blockcount - 1))
- xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK,
- irec.br_startoff);
-
/*
- * Unwritten extents or blocks mapped above the highest
+ * delalloc extents or blocks mapped above the highest
* quota id shouldn't happen.
*/
if (isnullstartblock(irec.br_startblock) ||
irec.br_startoff > max_dqid_off ||
- irec.br_startoff + irec.br_blockcount > max_dqid_off + 1)
- xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, off);
+ irec.br_startoff + irec.br_blockcount - 1 > max_dqid_off) {
+ xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK,
+ irec.br_startoff);
+ break;
+ }
}
+
+ return error;
+}
+
+/* Scrub all of a quota type's items. */
+int
+xfs_scrub_quota(
+ struct xfs_scrub_context *sc)
+{
+ struct xfs_scrub_quota_info sqi;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_quotainfo *qi = mp->m_quotainfo;
+ uint dqtype;
+ int error = 0;
+
+ dqtype = xfs_scrub_quota_to_dqtype(sc);
+
+ /* Look for problem extents. */
+ error = xfs_scrub_quota_data_fork(sc);
+ if (error)
+ goto out;
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
goto out;