From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Fri, 29 Jun 2012 09:58:47 +0000 (-0600)
Subject: Btrfs: remove redundant r/o check for superblock
X-Git-Tag: v3.6-rc4~6^2~53
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=768e9dfe820abdcfb6683e05c60b8634f1a4ffce;p=platform%2Fkernel%2Flinux-stable.git

Btrfs: remove redundant r/o check for superblock

mnt_want_write() and mnt_want_write_file() will check sb->s_flags with
MS_RDONLY, and we don't need to do it ourselves.

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

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index c1f4975..b8034dc 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1381,14 +1381,10 @@ static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
 						    u64 *transid,
 						    bool readonly)
 {
-	struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
 	struct file *src_file;
 	int namelen;
 	int ret = 0;
 
-	if (root->fs_info->sb->s_flags & MS_RDONLY)
-		return -EROFS;
-
 	ret = mnt_want_write_file(file);
 	if (ret)
 		goto out;
@@ -3269,9 +3265,6 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	if (fs_info->sb->s_flags & MS_RDONLY)
-		return -EROFS;
-
 	ret = mnt_want_write(file->f_path.mnt);
 	if (ret)
 		return ret;