From: Filipe David Borba Manana <fdmanana@gmail.com>
Date: Thu, 12 Dec 2013 19:19:52 +0000 (+0000)
Subject: Btrfs: return immediately if tree log mod is not necessary
X-Git-Tag: v3.14-rc1~29^2~92
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=783577663507411e36e459390ef056556e93ef29;p=pandora-kernel.git

Btrfs: return immediately if tree log mod is not necessary

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@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

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