linux-kernel - [47/53] fuse: fix llseek bug

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Date:	Fri, 16 Dec 2011 11:45:44 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Miklos Szeredi <mszeredi@...e.cz>,
	Josef Bacik <josef@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: [47/53] fuse: fix llseek bug

3.1-stable review patch.  If anyone has any objections, please let me know.

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

From: Roel Kluin <roel.kluin@...il.com>

commit b48c6af2086ab2ba8a9c9b6ce9ecb34592ce500c upstream.

The test in fuse_file_llseek() "not SEEK_CUR or not SEEK_SET" always evaluates
to true.

This was introduced in 3.1 by commit 06222e49 (fs: handle SEEK_HOLE/SEEK_DATA
properly in all fs's that define their own llseek) and changed the behavior of
SEEK_CUR and SEEK_SET to always retrieve the file attributes.  This is a
performance regression.

Fix the test so that it makes sense.

Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
CC: Josef Bacik <josef@...hat.com>
CC: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/fuse/file.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1556,7 +1556,7 @@ static loff_t fuse_file_llseek(struct fi
 	struct inode *inode = file->f_path.dentry->d_inode;
 
 	mutex_lock(&inode->i_mutex);
-	if (origin != SEEK_CUR || origin != SEEK_SET) {
+	if (origin != SEEK_CUR && origin != SEEK_SET) {
 		retval = fuse_update_attributes(inode, NULL, file, NULL);
 		if (retval)
 			goto exit;


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