linux-kernel - [PATCH 3.13 137/149] Btrfs: return immediately if tree log mod is not necessary

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Date:	Thu, 20 Mar 2014 17:05:00 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Filipe David Borba Manana <fdmanana@...il.com>,
	Josef Bacik <jbacik@...com>, Chris Mason <clm@...com>
Subject: [PATCH 3.13 137/149] Btrfs: return immediately if tree log mod is not necessary

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

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

From: Filipe David Borba Manana <fdmanana@...il.com>

commit 783577663507411e36e459390ef056556e93ef29 upstream.

In ctree.c:tree_mod_log_set_node_key() we were calling
__tree_mod_log_insert_key() even when the modification doesn't need
to be logged. This would allocate a tree_mod_elem structure, fill it
and pass it to  __tree_mod_log_insert(), which would just acquire
the tree mod log write lock and then free the tree_mod_elem structure
and return (that is, a no-op).

Therefore call tree_mod_log_insert() instead of __tree_mod_log_insert()
which just returns immediately if the modification doesn't need to be
logged (without allocating the structure, fill it, acquire write lock,
free structure).

Signed-off-by: Filipe David Borba Manana <fdmanana@...il.com>
Signed-off-by: Josef Bacik <jbacik@...com>
Signed-off-by: Chris Mason <clm@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -772,7 +772,7 @@ tree_mod_log_set_node_key(struct btrfs_f
 {
 	int ret;

-	ret = __tree_mod_log_insert_key(fs_info, eb, slot,
+	ret = tree_mod_log_insert_key(fs_info, eb, slot,
 					MOD_LOG_KEY_REPLACE,
 					atomic ? GFP_ATOMIC : GFP_NOFS);
 	BUG_ON(ret < 0);

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