From: Liu Bo <bo.li.liu@oracle.com>
Date: Thu, 25 Jan 2018 18:02:53 +0000 (-0700)
Subject: Btrfs: fix btrfs_evict_inode to handle abnormal inodes correctly
X-Git-Tag: v4.19~1424^2~17
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e8f1bc1493855e32b7a2a019decc3c353d94daf6;p=platform%2Fkernel%2Flinux-rpi.git

Btrfs: fix btrfs_evict_inode to handle abnormal inodes correctly

This regression is introduced in
commit 3d48d9810de4 ("btrfs: Handle uninitialised inode eviction").

There are two problems,

a) it is ->destroy_inode() that does the final free on inode, not
   ->evict_inode(),
b) clear_inode() must be called before ->evict_inode() returns.

This could end up hitting BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
in evict() because I_CLEAR is set in clear_inode().

Fixes: commit 3d48d9810de4 ("btrfs: Handle uninitialised inode eviction")
Cc: <stable@vger.kernel.org> # v4.7-rc6+
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a68a4ac..44a152d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5281,7 +5281,7 @@ void btrfs_evict_inode(struct inode *inode)
 	trace_btrfs_inode_evict(inode);
 
 	if (!root) {
-		kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
+		clear_inode(inode);
 		return;
 	}