[PATCH 08/11] xfs: don't emit v5 superblock warnings on write

[Ben Myers]

On Tue, May 21, 2013 at 06:02:07PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner at redhat.com>
> 
> We write the superblock every 30s or so which results in the
> verifier being called. Right now that results in this output
> every 30s:
> 
> XFS (vda): Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled!
> Use of these features in this kernel is at your own risk!
> 
> And spamming the logs. Stop this output from occurring on superblock
> writes.
> 
> Signed-off-by: Dave Chinner <dchinner at redhat.com>
> ---
>  fs/xfs/xfs_mount.c |   18 +++++++++++-------
>  1 file changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> index f6bfbd7..e8e310c 100644
> --- a/fs/xfs/xfs_mount.c
> +++ b/fs/xfs/xfs_mount.c
> @@ -314,7 +314,8 @@ STATIC int
>  xfs_mount_validate_sb(
>  	xfs_mount_t	*mp,
>  	xfs_sb_t	*sbp,
> -	bool		check_inprogress)
> +	bool		check_inprogress,
> +	bool		check_version)
>  {
>  
>  	/*
> @@ -337,9 +338,10 @@ xfs_mount_validate_sb(
>  
>  	/*
>  	 * Version 5 superblock feature mask validation. Reject combinations the
> -	 * kernel cannot support up front before checking anything else.
> +	 * kernel cannot support up front before checking anything else. For
> +	 * write validation, we don't need to check feature masks.
>  	 */
> -	if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) {
> +	if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) {

if (!quiet_version) {
>  		xfs_alert(mp,
>  "Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled!\n"
>  "Use of these features in this kernel is at your own risk!");

}

Since the stated goal of the patch is to be quieter and not to disable useful
tests in the verifier, I suggest you disable the print rather than disable the
test.

-Ben