|author||Namjae Jeon <email@example.com>||2013-04-29 16:21:15 -0700|
|committer||Linus Torvalds <firstname.lastname@example.org>||2013-04-29 18:28:41 -0700|
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 <email@example.com> Signed-off-by: Ravishankar N <firstname.lastname@example.org> Signed-off-by: Amit Sahrawat <email@example.com> Acked-by: OGAWA Hirofumi <firstname.lastname@example.org> Acked-by: Rob Landley <email@example.com> Signed-off-by: Andrew Morton <firstname.lastname@example.org> Signed-off-by: Linus Torvalds <email@example.com>
1 files changed, 21 insertions, 5 deletions
diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt
index d230dd9c99b..4a93e98b290 100644
@@ -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.
+ 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