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

[Brian Foster <bfoster@redhat.com>]

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;
>  
> 
> --
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