From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx> update nfs option in filesystem/vfat.txt Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx> Signed-off-by: Ravishankar N <ravi.n1@xxxxxxxxxxx> Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx> --- 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 d230dd9..f663c70 100644 --- a/Documentation/filesystems/vfat.txt +++ b/Documentation/filesystems/vfat.txt @@ -150,13 +150,26 @@ 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 + <bool>: 0,1,yes,no,true,false TODO -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
