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.
Signed-off-by: Josef Bacik <jo...@toxicpanda.com> --- fs/btrfs/extent-tree.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 13441a293c73..44d59bee6e5e 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; @@ -8084,11 +8085,17 @@ static int __btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info, if (pin) pin_down_extent(fs_info, cache, start, len, 1); else { + struct btrfs_space_info *space_info = cache->space_info; + if (btrfs_test_opt(fs_info, DISCARD)) ret = btrfs_discard_extent(fs_info, start, len, NULL, BTRFS_CLEAR_OP_DISCARD); btrfs_add_free_space(cache, start, len); btrfs_free_reserved_bytes(cache, len, delalloc); + + spin_lock(&space_info->lock); + space_info->max_extent_size = 0; + spin_unlock(&space_info->lock); trace_btrfs_reserved_extent_free(fs_info, start, len); } -- 2.14.3