From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Fri, 29 Jun 2012 09:58:48 +0000 (-0600)
Subject: Btrfs: use mnt_want_write_file instead of mnt_want_write
X-Git-Tag: v3.12-rc1~2408^2~53
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e54bfa31044d602a57d4e190f6d1c3763ea76bfe;p=kernel%2Fkernel-generic.git

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>
---

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 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
 	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_bargs:
 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;
 }