linux-kernel - Re: [PATCH v4 4/4] Documentation: update nfs option in filesystem/vfat.txt

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Date:	Mon, 8 Oct 2012 14:53:47 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	hirofumi@...l.parknet.co.jp, akpm@...ux-foundation.org,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ravishankar N <ravi.n1@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH v4 4/4] Documentation: update nfs option in
 filesystem/vfat.txt

On Sun, Oct 07, 2012 at 04:33:02AM -0400, Namjae Jeon wrote:
> From: Namjae Jeon <namjae.jeon@...sung.com>
> 
> update nfs option in filesystem/vfat.txt
> 
> Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
> Signed-off-by: Ravishankar N <ravi.n1@...sung.com>
> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
> ---
>  Documentation/filesystems/vfat.txt |   23 ++++++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt
> index de1e6c4..d62f8e6 100644
> --- a/Documentation/filesystems/vfat.txt
> +++ b/Documentation/filesystems/vfat.txt
> @@ -141,13 +141,26 @@ discard       -- If set, issues discard/TRIM commands to the block
>  		 device when blocks are freed. This is useful for SSD devices
>  		 and sparse/thinly-provisoned LUNs.
>  
> -nfs           -- This option maintains an index (cache) of directory
> -		 inodes by i_logstart which is used by the nfs-related code to
> -		 improve look-ups.
> -
> -		 Enable this only if you want to export the FAT filesystem
> +nfs= stale_rw|nostale_ro
> +	      -- Enable this only if you want to export the FAT filesystem
>  		 over NFS
>  
> +		 stale_rw:This option maintains an index (cache) of directory
> +		 inodes by i_logstart which is used by the nfs-related code to
> +		 improve look-ups.Full file operations (read/write) over NFS is supported
> +		 but with cache eviction at NFS server, this could result in ESTALE issues.
> +
> +		 nostale_ro:This option bases the inode number and filehandle on the on-disk
> +		 location of a file in the MS-DOS directory entry.This ensures that ESTALE
> +		 will not be returned after a file is evicted from the inode cache. However,
> +		 it means that operations such as rename, create and unlink could cause
> +		 filehandles that previously pointed at one file to point at a different file,
> +		 potentially causing data corruption. For this reason, this option also mounts
> +		 the filesystem readonly.
> +
> +		 To maintain backward compatibility, '-o nfs' is also accepted, defaulting to
> +		 stale_rw
> +

The documentation makes more sense to me now, thanks.

--b.
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