linux-kernel - [110/272] NFS: Fix NFSv3 exclusive open semantics

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Date:	Tue, 15 Feb 2011 16:12:47 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Trond Myklebust <Trond.Myklebust@...app.com>
Subject: [110/272] NFS: Fix NFSv3 exclusive open semantics

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Trond Myklebust <Trond.Myklebust@...app.com>

commit 8a0eebf66e3b1deae036553ba641a9c2bdbae678 upstream.

Commit c0204fd2b8fe047b18b67e07e1bf2a03691240cd (NFS: Clean up
nfs4_proc_create()) broke NFSv3 exclusive open by removing the code
that passes the O_EXCL flag down to nfs3_proc_create(). This patch
reverts that offending hunk from the original commit.

Reported-by: Nick Bowler <nbowler@...iptictech.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Tested-by: Nick Bowler <nbowler@...iptictech.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/nfs/dir.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1577,6 +1577,7 @@ static int nfs_create(struct inode *dir,
 {
 	struct iattr attr;
 	int error;
+	int open_flags = 0;
 
 	dfprintk(VFS, "NFS: create(%s/%ld), %s\n",
 			dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
@@ -1584,7 +1585,10 @@ static int nfs_create(struct inode *dir,
 	attr.ia_mode = mode;
 	attr.ia_valid = ATTR_MODE;
 
-	error = NFS_PROTO(dir)->create(dir, dentry, &attr, 0, NULL);
+	if ((nd->flags & LOOKUP_CREATE) != 0)
+		open_flags = nd->intent.open.flags;
+
+	error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, NULL);
 	if (error != 0)
 		goto out_err;
 	return 0;


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