On Tue, Dec 18, 2018 at 03:10:02PM +0200, Nikolay Borisov wrote: > We can never have extents marked as EXTENT_MAP_DELALLOC since this > value is only ever used by btrfs_get_extent_fiemap. In this case the > extent map is created by btrfs_get_extent_fiemap and is never really > published, this flag is used to return the corresponding userspace one. > Considering this, it's pointless having a check for EXTENT_MAP_DELALLOC > in mergable_maps. Just remove it.
An assert would be good and a comment at EXTENT_MAP_DELALLOC definition repeating what's in the changelog. Otherwise ok.
