This is a note to let you know that I've just added the patch titled
NFS: Fix fcntl F_GETLK not reporting some conflicts
to the 2.6.36-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfs-fix-fcntl-f_getlk-not-reporting-some-conflicts.patch
and it can be found in the queue-2.6.36 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 21ac19d484a8ffb66f64487846c8d53afef04d2b Mon Sep 17 00:00:00 2001
From: Sergey Vlasov <[email protected]>
Date: Sun, 28 Nov 2010 21:04:05 +0000
Subject: NFS: Fix fcntl F_GETLK not reporting some conflicts
From: Sergey Vlasov <[email protected]>
commit 21ac19d484a8ffb66f64487846c8d53afef04d2b upstream.
The commit 129a84de2347002f09721cda3155ccfd19fade40 (locks: fix F_GETLK
regression (failure to find conflicts)) fixed the posix_test_lock()
function by itself, however, its usage in NFS changed by the commit
9d6a8c5c213e34c475e72b245a8eb709258e968c (locks: give posix_test_lock
same interface as ->lock) remained broken - subsequent NFS-specific
locking code received F_UNLCK instead of the user-specified lock type.
To fix the problem, fl->fl_type needs to be saved before the
posix_test_lock() call and restored if no local conflicts were reported.
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=23892
Tested-by: Alexander Morozov <[email protected]>
Signed-off-by: Sergey Vlasov <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/nfs/file.c | 2 ++
1 file changed, 2 insertions(+)
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -687,6 +687,7 @@ static int do_getlk(struct file *filp, i
{
struct inode *inode = filp->f_mapping->host;
int status = 0;
+ unsigned int saved_type = fl->fl_type;
/* Try local locking first */
posix_test_lock(filp, fl);
@@ -694,6 +695,7 @@ static int do_getlk(struct file *filp, i
/* found a conflict */
goto out;
}
+ fl->fl_type = saved_type;
if (nfs_have_delegation(inode, FMODE_READ))
goto out_noconflict;
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.36/nfs-fix-fcntl-f_getlk-not-reporting-some-conflicts.patch
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