Re: [PATCH] NFS: Only warn on unrecognized mount options

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On Fri, 11 Apr 2008 16:28:43 -0400
Chuck Lever <chuck.lever@xxxxxxxxxx> wrote:

> To provide compatibility with automounters who use a common set of mount
> options for all file systems, change the NFS in-kernel mount option parser
> to ignore mount options it doesn't recognize.
> 
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
> Take 2.
> 
>  fs/nfs/super.c |    7 ++-----
>  1 files changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/nfs/super.c b/fs/nfs/super.c
> index f921902..cbf2b37 100644
> --- a/fs/nfs/super.c
> +++ b/fs/nfs/super.c
> @@ -1044,7 +1044,8 @@ static int nfs_parse_mount_options(char *raw,
>  			break;
>  
>  		default:
> -			goto out_unknown;
> +			dfprintk(MOUNT, "NFS: unrecognized mount option '%s'"
> +					" ignored\n", p);
>  		}
>  	}
>  
> @@ -1070,10 +1071,6 @@ out_unrec_xprt:
>  out_unrec_sec:
>  	printk(KERN_INFO "NFS: unrecognized security flavor\n");
>  	return 0;
> -
> -out_unknown:
> -	printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
> -	return 0;
>  }
>  
>  /*
> 


Sorry for late reply on this...

I wonder if we should make this conditional on the "-s" (sloppy)
option? I think autofs will use that option when it mounts. There are a
couple of ways we could approach this:

1) have -s set a mount flag (which means getting a new MS_SLOPPY flag
added to the VFS).

2) have -s make mount.nfs prepend an implicit "sloppy," to the option
string. That would get parsed first and you could make the behavior of
unrecognized mount options be dependent upon that.

#2 sounds fairly easy to do, actually...

-- 
Jeff Layton <jlayton@xxxxxxxxxx>
--
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