Btrfs: Properly update free space cache in __free_extent

When pin_down_bytes decides not to pin a block because it was from the
current transaction, make sure the in memory cache of free extents is updated

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e7192ea8f96c..9eb2ee02f643 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -714,7 +714,7 @@ static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
                                     root->fs_info->running_transaction->transid;
                                 if (btrfs_header_generation(buf) == transid) {
                                         free_extent_buffer(buf);
-                                        return 0;
+                                        return 1;
                                 }
                         }
                         free_extent_buffer(buf);
@@ -774,7 +774,9 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 
                 if (pin) {
                         ret = pin_down_bytes(root, bytenr, num_bytes, 0);
-                        BUG_ON(ret);
+                        if (ret > 0)
+                                mark_free = 1;
+                        BUG_ON(ret < 0);
                 }
 
                 /* block accounting for super block */