Re: [PATCH 03/12] xfs: skip scrub xref if corruption already noted

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On Thu, May 03, 2018 at 11:06:13AM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> 
> Don't bother looking for cross-referencing problems if the metadata is
> already corrupt or we've already found a cross-referencing problem.
> Since we added a helper function for flags testing, convert existing
> users to use it.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---

Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>

>  fs/xfs/scrub/alloc.c    |    4 ++--
>  fs/xfs/scrub/bmap.c     |    2 +-
>  fs/xfs/scrub/common.c   |    4 ++++
>  fs/xfs/scrub/common.h   |   10 ++++++++++
>  fs/xfs/scrub/ialloc.c   |    7 ++++---
>  fs/xfs/scrub/inode.c    |    5 ++++-
>  fs/xfs/scrub/refcount.c |    8 ++++----
>  fs/xfs/scrub/rmap.c     |    6 +++---
>  fs/xfs/scrub/rtbitmap.c |    3 +++
>  fs/xfs/scrub/scrub.c    |    4 ++--
>  10 files changed, 37 insertions(+), 16 deletions(-)
> 
> 
> diff --git a/fs/xfs/scrub/alloc.c b/fs/xfs/scrub/alloc.c
> index 517c079d3f68..941a0a55224e 100644
> --- a/fs/xfs/scrub/alloc.c
> +++ b/fs/xfs/scrub/alloc.c
> @@ -70,7 +70,7 @@ xfs_scrub_allocbt_xref_other(
>  		pcur = &sc->sa.cnt_cur;
>  	else
>  		pcur = &sc->sa.bno_cur;
> -	if (!*pcur)
> +	if (!*pcur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	error = xfs_alloc_lookup_le(*pcur, agbno, len, &has_otherrec);
> @@ -172,7 +172,7 @@ xfs_scrub_xref_is_used_space(
>  	bool				is_freesp;
>  	int				error;
>  
> -	if (!sc->sa.bno_cur)
> +	if (!sc->sa.bno_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	error = xfs_alloc_has_record(sc->sa.bno_cur, agbno, len, &is_freesp);
> diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
> index 639d14b51e90..fb91caf17652 100644
> --- a/fs/xfs/scrub/bmap.c
> +++ b/fs/xfs/scrub/bmap.c
> @@ -175,7 +175,7 @@ xfs_scrub_bmap_xref_rmap(
>  	unsigned long long		rmap_end;
>  	uint64_t			owner;
>  
> -	if (!info->sc->sa.rmap_cur)
> +	if (!info->sc->sa.rmap_cur || xfs_scrub_skip_xref(info->sc->sm))
>  		return;
>  
>  	if (info->whichfork == XFS_COW_FORK)
> diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
> index 8ed91d5c868d..e9ca5f0802d5 100644
> --- a/fs/xfs/scrub/common.c
> +++ b/fs/xfs/scrub/common.c
> @@ -727,6 +727,10 @@ xfs_scrub_should_check_xref(
>  	int				*error,
>  	struct xfs_btree_cur		**curpp)
>  {
> +	/* No point in xref if we already know we're corrupt. */
> +	if (xfs_scrub_skip_xref(sc->sm))
> +		return false;
> +
>  	if (*error == 0)
>  		return true;
>  
> diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h
> index deaf60400981..80fa5a67c265 100644
> --- a/fs/xfs/scrub/common.h
> +++ b/fs/xfs/scrub/common.h
> @@ -157,4 +157,14 @@ int xfs_scrub_setup_inode_contents(struct xfs_scrub_context *sc,
>  				   struct xfs_inode *ip, unsigned int resblks);
>  void xfs_scrub_buffer_recheck(struct xfs_scrub_context *sc, struct xfs_buf *bp);
>  
> +/*
> + * Don't bother cross-referencing if we already found corruption or cross
> + * referencing discrepancies.
> + */
> +static inline bool xfs_scrub_skip_xref(struct xfs_scrub_metadata *sm)
> +{
> +	return sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
> +			       XFS_SCRUB_OFLAG_XCORRUPT);
> +}
> +
>  #endif	/* __XFS_SCRUB_COMMON_H__ */
> diff --git a/fs/xfs/scrub/ialloc.c b/fs/xfs/scrub/ialloc.c
> index 106ca4bd753f..00a834d3b56d 100644
> --- a/fs/xfs/scrub/ialloc.c
> +++ b/fs/xfs/scrub/ialloc.c
> @@ -387,7 +387,8 @@ xfs_scrub_iallocbt_xref_rmap_btreeblks(
>  	int				error;
>  
>  	if (!sc->sa.ino_cur || !sc->sa.rmap_cur ||
> -	    (xfs_sb_version_hasfinobt(&sc->mp->m_sb) && !sc->sa.fino_cur))
> +	    (xfs_sb_version_hasfinobt(&sc->mp->m_sb) && !sc->sa.fino_cur) ||
> +	    xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	/* Check that we saw as many inobt blocks as the rmap says. */
> @@ -424,7 +425,7 @@ xfs_scrub_iallocbt_xref_rmap_inodes(
>  	xfs_filblks_t			blocks;
>  	int				error;
>  
> -	if (!sc->sa.rmap_cur)
> +	if (!sc->sa.rmap_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	/* Check that we saw as many inode blocks as the rmap knows about. */
> @@ -496,7 +497,7 @@ xfs_scrub_xref_inode_check(
>  	bool				has_inodes;
>  	int				error;
>  
> -	if (!(*icur))
> +	if (!(*icur) || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	error = xfs_ialloc_has_inodes_at_extent(*icur, agbno, len, &has_inodes);
> diff --git a/fs/xfs/scrub/inode.c b/fs/xfs/scrub/inode.c
> index df14930e4fc5..8532fc7be838 100644
> --- a/fs/xfs/scrub/inode.c
> +++ b/fs/xfs/scrub/inode.c
> @@ -449,7 +449,7 @@ xfs_scrub_inode_xref_finobt(
>  	int				has_record;
>  	int				error;
>  
> -	if (!sc->sa.fino_cur)
> +	if (!sc->sa.fino_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	agino = XFS_INO_TO_AGINO(sc->mp, ino);
> @@ -492,6 +492,9 @@ xfs_scrub_inode_xref_bmap(
>  	xfs_filblks_t			acount;
>  	int				error;
>  
> +	if (xfs_scrub_skip_xref(sc->sm))
> +		return;
> +
>  	/* Walk all the extents to check nextents/naextents/nblocks. */
>  	error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK,
>  			&nextents, &count);
> diff --git a/fs/xfs/scrub/refcount.c b/fs/xfs/scrub/refcount.c
> index 400f1561cd3d..913b0a190e68 100644
> --- a/fs/xfs/scrub/refcount.c
> +++ b/fs/xfs/scrub/refcount.c
> @@ -310,7 +310,7 @@ xfs_scrub_refcountbt_xref_rmap(
>  	struct xfs_scrub_refcnt_frag	*n;
>  	int				error;
>  
> -	if (!sc->sa.rmap_cur)
> +	if (!sc->sa.rmap_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	/* Cross-reference with the rmapbt to confirm the refcount. */
> @@ -404,7 +404,7 @@ xfs_scrub_refcount_xref_rmap(
>  	xfs_filblks_t			blocks;
>  	int				error;
>  
> -	if (!sc->sa.rmap_cur)
> +	if (!sc->sa.rmap_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	/* Check that we saw as many refcbt blocks as the rmap knows about. */
> @@ -460,7 +460,7 @@ xfs_scrub_xref_is_cow_staging(
>  	int				has_refcount;
>  	int				error;
>  
> -	if (!sc->sa.refc_cur)
> +	if (!sc->sa.refc_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	/* Find the CoW staging extent. */
> @@ -504,7 +504,7 @@ xfs_scrub_xref_is_not_shared(
>  	bool				shared;
>  	int				error;
>  
> -	if (!sc->sa.refc_cur)
> +	if (!sc->sa.refc_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	error = xfs_refcount_has_record(sc->sa.refc_cur, agbno, len, &shared);
> diff --git a/fs/xfs/scrub/rmap.c b/fs/xfs/scrub/rmap.c
> index 8f2a7c3ff455..b376a9a77c04 100644
> --- a/fs/xfs/scrub/rmap.c
> +++ b/fs/xfs/scrub/rmap.c
> @@ -66,7 +66,7 @@ xfs_scrub_rmapbt_xref_refc(
>  	bool				is_unwritten;
>  	int				error;
>  
> -	if (!sc->sa.refc_cur)
> +	if (!sc->sa.refc_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	non_inode = XFS_RMAP_NON_INODE_OWNER(irec->rm_owner);
> @@ -207,7 +207,7 @@ xfs_scrub_xref_check_owner(
>  	bool				has_rmap;
>  	int				error;
>  
> -	if (!sc->sa.rmap_cur)
> +	if (!sc->sa.rmap_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	error = xfs_rmap_record_exists(sc->sa.rmap_cur, bno, len, oinfo,
> @@ -250,7 +250,7 @@ xfs_scrub_xref_has_no_owner(
>  	bool				has_rmap;
>  	int				error;
>  
> -	if (!sc->sa.rmap_cur)
> +	if (!sc->sa.rmap_cur || xfs_scrub_skip_xref(sc->sm))
>  		return;
>  
>  	error = xfs_rmap_has_record(sc->sa.rmap_cur, bno, len, &has_rmap);
> diff --git a/fs/xfs/scrub/rtbitmap.c b/fs/xfs/scrub/rtbitmap.c
> index 39c41dfe08ee..8b048f107af2 100644
> --- a/fs/xfs/scrub/rtbitmap.c
> +++ b/fs/xfs/scrub/rtbitmap.c
> @@ -110,6 +110,9 @@ xfs_scrub_xref_is_used_rt_space(
>  	bool				is_free;
>  	int				error;
>  
> +	if (xfs_scrub_skip_xref(sc->sm))
> +		return;
> +
>  	xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
>  	error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, fsbno, len,
>  			&is_free);
> diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
> index 26c75967a072..d9ecbb6ad4a3 100644
> --- a/fs/xfs/scrub/scrub.c
> +++ b/fs/xfs/scrub/scrub.c
> @@ -446,8 +446,8 @@ xfs_scrub_metadata(
>  	} else if (error)
>  		goto out_teardown;
>  
> -	if (sc.sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
> -			       XFS_SCRUB_OFLAG_XCORRUPT))
> +	if (sm->sm_flags & (XFS_SCRUB_OFLAG_CORRUPT |
> +			    XFS_SCRUB_OFLAG_XCORRUPT))
>  		xfs_alert_ratelimited(mp, "Corruption detected during scrub.");
>  
>  out_teardown:
> 
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