From: Filipe Manana <fdmanana@suse.com>
Date: Sat, 13 Jun 2015 05:52:56 +0000 (+0100)
Subject: Btrfs: use kmem_cache_free when freeing entry in inode cache
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=c3f4a1685bb87e59c886ee68f7967eae07d4dffa;p=openwrt%2Fstaging%2Fblogic.git

Btrfs: use kmem_cache_free when freeing entry in inode cache

The free space entries are allocated using kmem_cache_zalloc(),
through __btrfs_add_free_space(), therefore we should use
kmem_cache_free() and not kfree() to avoid any confusion and
any potential problem. Looking at the kfree() definition at
mm/slab.c it has the following comment:

  /*
   * (...)
   *
   * Don't free memory not originally allocated by kmalloc()
   * or you will run into trouble.
   */

So better be safe and use kmem_cache_free().

Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index f6a596d5a637..218df701e607 100644
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -271,7 +271,7 @@ void btrfs_unpin_free_ino(struct btrfs_root *root)
 		__btrfs_add_free_space(ctl, info->offset, count);
 free:
 		rb_erase(&info->offset_index, rbroot);
-		kfree(info);
+		kmem_cache_free(btrfs_free_space_cachep, info);
 	}
 }