From 44049db95d613a08c4a5591e80a81ae75ce2e901 Mon Sep 17 00:00:00 2001
From: Li Zefan <lizf@cn.fujitsu.com>
Date: Sun, 20 Nov 2011 07:33:38 -0500
Subject: [PATCH] --- yaml --- r: 275851 b: refs/heads/master c:
 0f0fbf1d0e188d129756e9508090af4bdbfde00b h: refs/heads/master i:   275849:
 f55bcdfe00c4ce7493d5f6dd7fc6213229c285c2   275847:
 f2ce2ebd37443d7c18cb01a4c8fe187dae011270 v: v3

---
 [refs]                            |  2 +-
 trunk/fs/btrfs/free-space-cache.c | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index fd38929827c3..7bc9fd5c58ed 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 32240a913d9f3a5aad42175d7696590ea1bfdb08
+refs/heads/master: 0f0fbf1d0e188d129756e9508090af4bdbfde00b
diff --git a/trunk/fs/btrfs/free-space-cache.c b/trunk/fs/btrfs/free-space-cache.c
index 181760f9d2ab..8f792f41feab 100644
--- a/trunk/fs/btrfs/free-space-cache.c
+++ b/trunk/fs/btrfs/free-space-cache.c
@@ -2453,10 +2453,22 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group,
 	struct btrfs_free_space *entry;
 	struct rb_node *node;
 	int ret = -ENOSPC;
+	u64 bitmap_offset = offset_to_bitmap(ctl, offset);
 
 	if (ctl->total_bitmaps == 0)
 		return -ENOSPC;
 
+	/*
+	 * The bitmap that covers offset won't be in the list unless offset
+	 * is just its start offset.
+	 */
+	entry = list_first_entry(bitmaps, struct btrfs_free_space, list);
+	if (entry->offset != bitmap_offset) {
+		entry = tree_search_offset(ctl, bitmap_offset, 1, 0);
+		if (entry && list_empty(&entry->list))
+			list_add(&entry->list, bitmaps);
+	}
+
 	/*
 	 * First check our cached list of bitmaps and see if there is an entry
 	 * here that will work.