From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752655Ab2JGIdP (ORCPT ); Sun, 7 Oct 2012 04:33:15 -0400 Received: from mail-pa0-f46.google.com ([209.85.220.46]:48938 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751010Ab2JGIdM (ORCPT ); Sun, 7 Oct 2012 04:33:12 -0400 From: Namjae Jeon To: hirofumi@mail.parknet.co.jp, akpm@linux-foundation.org Cc: bfields@fieldses.org, viro@zeniv.linux.org.uk, linux-kernel@vger.kernel.org, Namjae Jeon , Namjae Jeon , Ravishankar N , Amit Sahrawat Subject: [PATCH v4 4/4] Documentation: update nfs option in filesystem/vfat.txt Date: Sun, 7 Oct 2012 04:33:02 -0400 Message-Id: <1349598782-3286-1-git-send-email-linkinjeon@gmail.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Namjae Jeon update nfs option in filesystem/vfat.txt Signed-off-by: Namjae Jeon Signed-off-by: Ravishankar N Signed-off-by: Amit Sahrawat --- 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 de1e6c4..d62f8e6 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 -- 1.7.9.5