Re: [PATCH 5/6] xfs: verify root inode more thoroughly

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Tue, Jun 05, 2018 at 04:24:22PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
> 
> When looking up the root inode at mount time, we don't actually do
> any verification to check that the inode is allocated and accounted
> for correctly in the INOBT. Make the checks on the root inode more
> robust by making it an untrusted lookup. This forces the inode
> lookup to use the inode btree to verify the inode is allocated
> and mapped correctly to disk. This will also have the effect of
> catching a significant number of AGI/INOBT related corruptions in
> AG 0 at mount time.
> 
> Signed-off-by: Dave Chinner <dchinner@redhat.com>

Looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> ---
>  fs/xfs/xfs_mount.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> index 189fa7b615d3..a3378252baa1 100644
> --- a/fs/xfs/xfs_mount.c
> +++ b/fs/xfs/xfs_mount.c
> @@ -862,9 +862,12 @@ xfs_mountfs(
>  	 * Get and sanity-check the root inode.
>  	 * Save the pointer to it in the mount structure.
>  	 */
> -	error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip);
> +	error = xfs_iget(mp, NULL, sbp->sb_rootino, XFS_IGET_UNTRUSTED,
> +			 XFS_ILOCK_EXCL, &rip);
>  	if (error) {
> -		xfs_warn(mp, "failed to read root inode");
> +		xfs_warn(mp,
> +			"Failed to read root inode 0x%llx, error %d",
> +			sbp->sb_rootino, -error);
>  		goto out_log_dealloc;
>  	}
>  
> -- 
> 2.17.0
> 
> --
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