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Documentation: update nfs option in filesystem/vfat.txt 

Add descriptions about 'stale_rw' and 'nostale_ro' nfs options 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>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Namjae Jeon 2013-04-29 16:21:15 -07:00 committed by Linus Torvalds
parent f1e6fb0ab4
commit 27cf10e133
1 changed files with 21 additions and 5 deletions
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26
Documentation/filesystems/vfat.txt
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@ -150,12 +150,28 @@ 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.
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
Enable this only if you want to export the FAT filesystem
over NFS
<bool>: 0,1,yes,no,true,false