Re: [PATCH] xfs: clear zapped attr fork state when bmap repair finds no attr fork

["Darrick J. Wong" <djwong@kernel.org>]

On Wed, Jul 15, 2026 at 06:30:26PM +0800, Qiang Ma wrote:
> xfstests xfs/377 can make xfs_scrub repeatedly check and repair the
> attr block map after inode repair zaps an attr fork.
> 
> When inode repair zaps an attr fork, it records
> XFS_SICK_INO_BMBTA_ZAPPED so that scrub/repair can revisit the attr fork
> block map.  If the fork has been reset to an empty state and removed,
> BMBTA repair has no attr fork mappings to rebuild and can return success.
> 
> The post-repair scrub then runs with XREP_ALREADY_FIXED set, which means
> xchk_file_looks_zapped() deliberately ignores the stale zapped health bit
> and asks xchk_bmap() to check the current attr fork.  For an absent attr
> fork, xchk_bmap() returns -ENOENT.  Returning that error prevents
> xchk_bmap_attr() from marking XFS_SICK_INO_BMBTA_ZAPPED healthy, leaving
> the zapped health state behind even though there are no attr fork mappings
> left to check.
> 
> Treat -ENOENT during post-repair BMBTA revalidation as a clean result for
> the zapped attr fork: clear XFS_SICK_INO_BMBTA_ZAPPED and return success.
> Keep the existing -ENOENT behavior for ordinary scrubs of absent attr
> forks.
> 
> Fixes: d9041681dd2f ("xfs: set inode sick state flags when we zap either ondisk fork")
> Signed-off-by: Qiang Ma <maqianga@uniontech.com>
> ---
>  fs/xfs/scrub/bmap.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
> index 70028da1aacc7..0cee51d4338e4 100644
> --- a/fs/xfs/scrub/bmap.c
> +++ b/fs/xfs/scrub/bmap.c
> @@ -1170,6 +1170,11 @@ xchk_bmap_attr(
>  	}
>  
>  	error = xchk_bmap(sc, XFS_ATTR_FORK);
> +	if (error == -ENOENT && (sc->flags & XREP_ALREADY_FIXED)) {
> +		/* A repaired, empty attr fork no longer has mappings to check. */
> +		xchk_mark_healthy_if_clean(sc, XFS_SICK_INO_BMBTA_ZAPPED);
> +		return 0;
> +	}

That makes sense.

Cc: <stable@vger.kernel.org> # v6.8
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

>  	if (error)
>  		return error;
>  
> -- 
> 2.20.1
> 
> 
>