[PATCH 4/6] btrfs: update stats when allocating from a cluster

[Li Zefan]

When allocating extent entry from a cluster, we should update
the free_space and free_extents fields of the block group.

Signed-off-by: Li Zefan <l...@cn.fujitsu.com>
---
 fs/btrfs/free-space-cache.c |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 631e14f..20f3141 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1090,15 +1090,26 @@ u64 btrfs_alloc_from_cluster(struct 
btrfs_block_group_cache *block_group,
                entry->offset += bytes;
                entry->bytes -= bytes;
 
-               if (entry->bytes == 0) {
+               if (entry->bytes == 0)
                        rb_erase(&entry->offset_index, &cluster->root);
-                       kfree(entry);
-               }
                break;
        }
 out:
        spin_unlock(&cluster->lock);
 
+       if (!ret)
+               return 0;
+
+       spin_lock(&block_group->tree_lock);
+
+       block_group->free_space -= bytes;
+       if (entry->bytes == 0) {
+               block_group->free_extents--;
+               kfree(entry);
+       }
+
+       spin_unlock(&block_group->tree_lock);
+
        return ret;
 }
 
-- 
1.7.0.1

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