From: Chris Mason Date: Fri, 10 Jun 2011 20:36:57 +0000 (-0400) Subject: Btrfs: make sure to recheck for bitmaps in clusters X-Git-Tag: firefly_0821_release~7613^2~914^2~8 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=38e87880666091fe9c572a7a2ed2e771d97ca5aa;p=firefly-linux-kernel-4.4.55.git Btrfs: make sure to recheck for bitmaps in clusters Josef recently changed the free extent cache to look in the block group cluster for any bitmaps before trying to add a new bitmap for the same offset. This avoids BUG_ON()s due covering duplicate ranges. But it didn't go quite far enough. A given free range might span between one or more bitmaps or free space entries. The code has looping to cover this, but it doesn't check for clustered bitmaps every time. This shuffles our gotos to check for a bitmap in the cluster for every new bitmap entry we try to add. Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 38f3fd923043..9f985a429877 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1492,7 +1492,7 @@ static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, if (ctl->op == &free_space_op) block_group = ctl->private; - +again: /* * Since we link bitmaps right into the cluster we need to see if we * have a cluster here, and if so and it has our bitmap we need to add @@ -1510,13 +1510,13 @@ static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, node = rb_first(&cluster->root); if (!node) { spin_unlock(&cluster->lock); - goto again; + goto no_cluster_bitmap; } entry = rb_entry(node, struct btrfs_free_space, offset_index); if (!entry->bitmap) { spin_unlock(&cluster->lock); - goto again; + goto no_cluster_bitmap; } if (entry->offset == offset_to_bitmap(ctl, offset)) { @@ -1531,7 +1531,8 @@ static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, goto out; } } -again: + +no_cluster_bitmap: bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), 1, 0); if (!bitmap_info) {