From: Yan, Zheng <zheng.yan@oracle.com>
Date: Mon, 31 May 2010 09:04:46 +0000 (+0000)
Subject: Btrfs: Fix BUG_ON for fs converted from extN
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=3bf84a5a834d13e7c5c3e8e5b5c6b26012118dd8;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

Btrfs: Fix BUG_ON for fs converted from extN

Tree blocks can live in data block groups in FS converted from extN.
So it's easy to trigger the BUG_ON.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 6c14101506e1..a46b64de8f02 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4360,7 +4360,8 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
 
 	block_rsv = get_block_rsv(trans, root);
 	cache = btrfs_lookup_block_group(root->fs_info, buf->start);
-	BUG_ON(block_rsv->space_info != cache->space_info);
+	if (block_rsv->space_info != cache->space_info)
+		goto out;
 
 	if (btrfs_header_generation(buf) == trans->transid) {
 		if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {