Hi all, this series adds the always_cow mode support after improving our COW write support a little bit first. The always_cow mode stresses the COW path a lot, but with a few xfstests fixups it generall looks good, except for a few tests that complain about fragmentation, which is rather inherent in this mode, and xfs/326 which inserts error tags into the COW path not getting the expected result. Changes since v2: - add a patch to remove xfs_trim_extent_eof - add a patch to remove the separate io_type and rely on existing state in the writeback path - rework the truncate race handling in the writeback path a little more Changes since v1: - make delalloc and unwritten extent conversions simpler and more robust - add a few additional cleanups - support all fallocate modes but actual preallocation - rebase on top of a fix from Brian (which is included as first patch to make the patch set more usable)
