[PATCH]: Remove redundant underlying file system checking that the quota files resides from dquot_quota_on()

[Jeff Liu <jeff.liu@oracle.com>]

Hi Jan,

When executing quotaon(8), all the file systems(ext3/ext4/reiserfs) binded to the VFS quota framework have
already ensured that the quota files are resides on the same file system with the specified super block
before invoking dquot_quota_on(), looks like we can be safely remove it from there IMHO.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>

---
 fs/quota/dquot.c |   11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 4674197..cb917a2 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2199,13 +2199,10 @@ int dquot_quota_on(struct super_block *sb, int type, int format_id,
 	int error = security_quota_on(path->dentry);
 	if (error)
 		return error;
-	/* Quota file not on the same filesystem? */
-	if (path->dentry->d_sb != sb)
-		error = -EXDEV;
-	else
-		error = vfs_load_quota_inode(path->dentry->d_inode, type,
-					     format_id, DQUOT_USAGE_ENABLED |
-					     DQUOT_LIMITS_ENABLED);
+
+	error = vfs_load_quota_inode(path->dentry->d_inode, type,
+				     format_id, DQUOT_USAGE_ENABLED |
+				     DQUOT_LIMITS_ENABLED);
 	return error;
 }
 EXPORT_SYMBOL(dquot_quota_on);
-- 
1.7.9