2012/10/9, J. Bruce Fields <[email protected]>:
> On Sun, Oct 07, 2012 at 04:33:02AM -0400, Namjae Jeon wrote:
>> From: Namjae Jeon <[email protected]>
>>
>> update nfs option in filesystem/vfat.txt
>>
>> Signed-off-by: Namjae Jeon <[email protected]>
>> Signed-off-by: Ravishankar N <[email protected]>
>> Signed-off-by: Amit Sahrawat <[email protected]>
>> ---
>> 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.
Thanks for your review.
>
> --b.
>
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