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Commit 27cf10e1 authored by Namjae Jeon's avatar Namjae Jeon Committed by Linus Torvalds
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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: default avatarNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: default avatarRavishankar N <ravi.n1@samsung.com>
Signed-off-by: default avatarAmit Sahrawat <a.sahrawat@samsung.com>
Acked-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Acked-by: default avatarRob Landley <rob@landley.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f1e6fb0a

Documentation/filesystems/vfat.txt

+21 −5
Original line number Diff line number Diff line
@@ -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

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.

		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