From: Namjae Jeon Date: Thu, 25 Oct 2012 01:15:15 +0000 (+1100) Subject: Documentation: update nfs option in filesystem/vfat.txt X-Git-Tag: next-20121031~1^2~30 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=dcb0837cb8f77a1bd6c5c6947481a0e30787610b;p=karo-tx-linux.git Documentation: update nfs option in filesystem/vfat.txt Update nfs option in filesystem/vfat.txt Signed-off-by: Namjae Jeon Signed-off-by: Ravishankar N Signed-off-by: Amit Sahrawat Cc: OGAWA Hirofumi Cc: "J. Bruce Fields" Signed-off-by: Andrew Morton --- diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt index de1e6c4dccff..d62f8e6967dc 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 + : 0,1,yes,no,true,false TODO