From 8ca6a4dbbf33d398b3afa736379fd3cd56347e4a Mon Sep 17 00:00:00 2001
From: Liu Bo <bo.li.liu@oracle.com>
Date: Wed, 20 Feb 2013 14:10:23 +0000
Subject: [PATCH] --- yaml --- r: 360461 b: refs/heads/master c:
 fa6ac8765c48a06dfed914e8c8c3a903f9d313a0 h: refs/heads/master i:   360459:
 899cf573158a28da137d7f89d1df4dc6fab49cec v: v3

---
 [refs]                 | 2 +-
 trunk/fs/btrfs/inode.c | 3 ++-
 trunk/fs/btrfs/ioctl.c | 6 ++++++
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index db04087cd685..0c141def6daa 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d4edf39bd5db443151efc993dac67ec9d6b5b8c1
+refs/heads/master: fa6ac8765c48a06dfed914e8c8c3a903f9d313a0
diff --git a/trunk/fs/btrfs/inode.c b/trunk/fs/btrfs/inode.c
index fce61991213c..b009fb52bd8a 100644
--- a/trunk/fs/btrfs/inode.c
+++ b/trunk/fs/btrfs/inode.c
@@ -7315,8 +7315,9 @@ int btrfs_drop_inode(struct inode *inode)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 
+	/* the snap/subvol tree is on deleting */
 	if (btrfs_root_refs(&root->root_item) == 0 &&
-	    !btrfs_is_free_space_inode(inode))
+	    root != root->fs_info->tree_root)
 		return 1;
 	else
 		return generic_drop_inode(inode);
diff --git a/trunk/fs/btrfs/ioctl.c b/trunk/fs/btrfs/ioctl.c
index e0893036da08..2bbbed506f5b 100644
--- a/trunk/fs/btrfs/ioctl.c
+++ b/trunk/fs/btrfs/ioctl.c
@@ -2174,6 +2174,12 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
 		shrink_dcache_sb(root->fs_info->sb);
 		btrfs_invalidate_inodes(dest);
 		d_delete(dentry);
+
+		/* the last ref */
+		if (dest->cache_inode) {
+			iput(dest->cache_inode);
+			dest->cache_inode = NULL;
+		}
 	}
 out_dput:
 	dput(dentry);