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

Brian Foster
2018-05-11T15:19:34Z

On Thu, May 10, 2018 at 12:18:19PM -0700, Darrick J. Wong wrote:
> 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>
> ---

Reviewed-by: Brian Foster <bfoster@redhat.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;