Re: [PATCH v2] xfs: only validate summary counts on primary superblock

[Carlos Maiolino <cmaiolino@redhat.com>]

On Wed, Aug 01, 2018 at 11:13:31PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> Skip the summary counter checks for secondary superblocks and inprogress
> primary superblocks because mkfs has always written those out with
> zeroed summary counters.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---
> v2: add the inprogress check
> ---

Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>

>  fs/xfs/libxfs/xfs_sb.c |   14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
> index ca1b3a7a9171..081f46e30556 100644
> --- a/fs/xfs/libxfs/xfs_sb.c
> +++ b/fs/xfs/libxfs/xfs_sb.c
> @@ -148,6 +148,7 @@ xfs_validate_sb_read(
>  STATIC int
>  xfs_validate_sb_write(
>  	struct xfs_mount	*mp,
> +	struct xfs_buf		*bp,
>  	struct xfs_sb		*sbp)
>  {
>  	/*
> @@ -155,10 +156,15 @@ xfs_validate_sb_write(
>  	 * the superblock.  We skip this in the read validator because there
>  	 * could be newer superblocks in the log and if the values are garbage
>  	 * even after replay we'll recalculate them at the end of log mount.
> +	 *
> +	 * mkfs has traditionally written zeroed counters to inprogress and
> +	 * secondary superblocks, so allow this usage to continue because
> +	 * we never read counters from such superblocks.
>  	 */
> -	if (sbp->sb_fdblocks > sbp->sb_dblocks ||
> -	    !xfs_verify_icount(mp, sbp->sb_icount) ||
> -	    sbp->sb_ifree > sbp->sb_icount) {
> +	if (XFS_BUF_ADDR(bp) == XFS_SB_DADDR && !sbp->sb_inprogress &&
> +	    (sbp->sb_fdblocks > sbp->sb_dblocks ||
> +	     !xfs_verify_icount(mp, sbp->sb_icount) ||
> +	     sbp->sb_ifree > sbp->sb_icount)) {
>  		xfs_warn(mp, "SB summary counter sanity check failed");
>  		return -EFSCORRUPTED;
>  	}
> @@ -756,7 +762,7 @@ xfs_sb_write_verify(
>  	error = xfs_validate_sb_common(mp, bp, &sb);
>  	if (error)
>  		goto out_error;
> -	error = xfs_validate_sb_write(mp, &sb);
> +	error = xfs_validate_sb_write(mp, bp, &sb);
>  	if (error)
>  		goto out_error;
>  
> --
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-- 
Carlos