linux-kernel - [PATCH v6 7/7] Documentation: update nfs option in filesystem/vfat.txt

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1360422191-12382-1-git-send-email-linkinjeon@gmail.com>
Date:	Sun, 10 Feb 2013 00:03:11 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	hirofumi@...l.parknet.co.jp, akpm@...ux-foundation.org
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <linkinjeon@...il.com>,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ravishankar N <ravi.n1@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: [PATCH v6 7/7] Documentation: update nfs option in filesystem/vfat.txt

From: Namjae Jeon <namjae.jeon@...sung.com>

Add descriptions about 'stale_rw' and 'nostale_ro' nfs options in
filesystem/vfat.txt

Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Ravishankar N <ravi.n1@...sung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
---
 Documentation/filesystems/vfat.txt |   26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt
index d230dd9..1ce26d5 100644
--- a/Documentation/filesystems/vfat.txt
+++ b/Documentation/filesystems/vfat.txt
@@ -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.
+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
 
-		 Enable this only if you want to export the FAT filesystem
-		 over NFS
 
 <bool>: 0,1,yes,no,true,false
 
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/