Re: [PATCH] NFS: Don't print a pNFS error if we aren't using pNFS

[Jeff Layton <jlayton@redhat.com>]

On Fri, 2016-11-04 at 09:08 -0400, Anna.Schumaker@netapp.com wrote:
> From: Anna Schumaker <Anna.Schumaker@Netapp.com>
> 
> We used to check for a valid layout type id before verifying pNFS flags
> as an indicator for if we are using pNFS.  This changed in 3132e49ece
> with the introduction of multiple layout types, since now we are passing
> an array of ids instead of just one.  Since then, users have been seeing
> a KERN_ERR printk show up whenever mounting NFS v4 without pNFS.  This
> patch restores the original behavior of exiting set_pnfs_layoutdriver()
> early if we aren't using pNFS.
> 
> Fixes 3132e49ece ("pnfs: track multiple layout types in fsinfo
> structure")
> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
> ---
>  fs/nfs/pnfs.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
> index 56b2d96..259ef85 100644
> --- a/fs/nfs/pnfs.c
> +++ b/fs/nfs/pnfs.c
> @@ -146,6 +146,8 @@ set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
>  	u32 id;
>  	int i;
>  
> +	if (fsinfo->nlayouttypes == 0)
> +		goto out_no_driver;
>  	if (!(server->nfs_client->cl_exchange_flags &
>  		 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
>  		printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",

Good catch!

Reviewed-by: Jeff Layton <jlayton@redhat.com>