+ blk-cgroup-fix-return-code-for-mkdir-calls.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     blk-cgroup: fix return code for mkdir calls
has been added to the -mm tree.  Its filename is
     blk-cgroup-fix-return-code-for-mkdir-calls.patch

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------------------------------------------------------
Subject: blk-cgroup: fix return code for mkdir calls
From: Ciju Rajan K <ciju@linux.vnet.ibm.com>

If the cgroup hierarchy for blkio control groups is deeper than two
levels, kernel should not allow the creation of further levels.  mkdir
system call does not except EINVAL as a return value.  This patch replaces
EINVAL with more appropriate EPERM

Signed-off-by: Ciju Rajan K <ciju@linux.vnet.ibm.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Divyesh Shah <dpshah@google.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 block/blk-cgroup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN block/blk-cgroup.c~blk-cgroup-fix-return-code-for-mkdir-calls block/blk-cgroup.c
--- a/block/blk-cgroup.c~blk-cgroup-fix-return-code-for-mkdir-calls
+++ a/block/blk-cgroup.c
@@ -966,7 +966,7 @@ blkiocg_create(struct cgroup_subsys *sub
 
 	/* Currently we do not support hierarchy deeper than two level (0,1) */
 	if (parent != cgroup->top_cgroup)
-		return ERR_PTR(-EINVAL);
+		return ERR_PTR(-EPERM);
 
 	blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL);
 	if (!blkcg)
_

Patches currently in -mm which might be from ciju@linux.vnet.ibm.com are

blk-cgroup-fix-return-code-for-mkdir-calls.patch