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SubjectRe: [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@samsung.com>
>
> update nfs option in filesystem/vfat.txt
>
> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
> Signed-off-by: Ravishankar N <ravi.n1@samsung.com>
> Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.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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