[PATCH 0/8] btrfs: some speedups around nowait dio

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

This patchset makes our direct IO code behave better for NOWAIT writes,
avoiding blocking in several places for potentially long periods due to
waits for IO. It also removes running the same nocow checks twice (which
can be expensive) and doing extra path allocations. The last patch in
the series has a test and the results I got before and after applying
this patchset.

Filipe Manana (8):
  btrfs: avoid blocking on page locks with nowait dio on compressed range
  btrfs: avoid blocking nowait dio when locking file range
  btrfs: avoid double nocow check when doing nowait dio writes
  btrfs: stop allocating a path when checking if cross reference exists
  btrfs: free path at can_nocow_extent() before checking for checksum items
  btrfs: release path earlier at can_nocow_extent()
  btrfs: avoid blocking when allocating context for nowait dio read/write
  btrfs: avoid blocking on space revervation when doing nowait dio writes

 fs/btrfs/ctree.h          |   5 +-
 fs/btrfs/delalloc-space.c |   9 +--
 fs/btrfs/extent-tree.c    |   9 +--
 fs/btrfs/file.c           | 104 +++++++++++-----------------------
 fs/btrfs/inode.c          | 116 ++++++++++++++++++++++++++++----------
 fs/btrfs/qgroup.c         |   5 +-
 fs/btrfs/qgroup.h         |  12 ++--
 fs/btrfs/relocation.c     |   3 +-
 fs/btrfs/root-tree.c      |   3 +-
 9 files changed, 144 insertions(+), 122 deletions(-)

-- 
2.33.0