This is a note to let you know that I've just added the patch titled
Btrfs: return immediately if tree log mod is not necessary
to the 3.13-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:
btrfs-return-immediately-if-tree-log-mod-is-not-necessary.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 783577663507411e36e459390ef056556e93ef29 Mon Sep 17 00:00:00 2001
From: Filipe David Borba Manana <fdmanana@xxxxxxxxx>
Date: Thu, 12 Dec 2013 19:19:52 +0000
Subject: Btrfs: return immediately if tree log mod is not necessary
From: Filipe David Borba Manana <fdmanana@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Josef Bacik <jbacik@xxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);
Patches currently in stable-queue which might be from fdmanana@xxxxxxxxx are
queue-3.13/btrfs-fix-data-corruption-when-reading-updating-compressed-extents.patch
queue-3.13/btrfs-fix-tree-mod-logging.patch
queue-3.13/btrfs-return-immediately-if-tree-log-mod-is-not-necessary.patch
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