The patch titled
Subject: Documentation: update nfs option in filesystem/vfat.txt
has been added to the -mm tree. Its filename is
documentation-update-nfs-option-in-filesystem-vfattxt.patch
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------------------------------------------------------
From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Subject: Documentation: update nfs option in filesystem/vfat.txt
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>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Cc: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/vfat.txt | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff -puN Documentation/filesystems/vfat.txt~documentation-update-nfs-option-in-filesystem-vfattxt Documentation/filesystems/vfat.txt
--- a/Documentation/filesystems/vfat.txt~documentation-update-nfs-option-in-filesystem-vfattxt
+++ a/Documentation/filesystems/vfat.txt
@@ -141,12 +141,25 @@ discard -- If set, issues discard/
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.
- Enable this only if you want to export the FAT filesystem
- over NFS
+ 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
_
Patches currently in -mm which might be from namjae.jeon@xxxxxxxxxxx are
fat-modify-nfs-mount-option.patch
fat-exportfs-rebuild-inode-if-ilookup-fails.patch
fat-exportfs-rebuild-directory-inode-if-fat_dget-fails.patch
documentation-update-nfs-option-in-filesystem-vfattxt.patch
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