commit e54bfa31044d602a57d4e190f6d1c3763ea76bfe
author Liu Bo <liubo2009@cn.fujitsu.com> Fri Jun 29 03:58:48 2012 -0600
committer Chris Mason <chris.mason@fusionio.com> Mon Jul 23 16:27:57 2012 -0400
tree 5274bf7cf782bbcaeab1505c51f4eb5d58a20448
parent 768e9dfe820abdcfb6683e05c60b8634f1a4ffce

Btrfs: use mnt_want_write_file instead of mnt_want_write

mnt_want_write_file is faster when file has been opened for write.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>

fs/btrfs/ioctl.c

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index b8034dc..13ed1c9 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3265,7 +3265,7 @@
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	ret = mnt_want_write(file->f_path.mnt);
+	ret = mnt_want_write_file(file);
 	if (ret)
 		return ret;
 
@@ -3335,7 +3335,7 @@
 out:
 	mutex_unlock(&fs_info->balance_mutex);
 	mutex_unlock(&fs_info->volume_mutex);
-	mnt_drop_write(file->f_path.mnt);
+	mnt_drop_write_file(file);
 	return ret;
 }