If we use up our block group before allocating a new one we'll easily get a max_extent_size that's set really really low, which will result in a lot of fragmentation. We need to make sure we're resetting the max_extent_size when we add a new chunk or add new space.
Reviewed-by: Filipe Manana <fdman...@suse.com> Signed-off-by: Josef Bacik <jo...@toxicpanda.com> --- fs/btrfs/extent-tree.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 640ec640b21c..2b1704331d21 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4573,6 +4573,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags, goto out; } else { ret = 1; + space_info->max_extent_size = 0; } space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; @@ -6671,6 +6672,7 @@ static int btrfs_free_reserved_bytes(struct btrfs_block_group_cache *cache, space_info->bytes_readonly += num_bytes; cache->reserved -= num_bytes; space_info->bytes_reserved -= num_bytes; + space_info->max_extent_size = 0; if (delalloc) cache->delalloc_bytes -= num_bytes; -- 2.14.3