[PATCH 0/3 v2] Preallocate flush bio

[David Sterba <dsterba@suse.com>]

This patchset follows the updates in the write_dev_flush function. The flush
bio can be preallocated at the device creation time, so we avoid repeated
alloc/free.

v2:
- merge 'flush_bio_sent' from 4 to 1 and dropped patch 4
- dropped sysfs tunable (patch 5)
- fix typo in patch 1 changelog

David Sterba (3):
  btrfs: preallocate device flush bio
  btrfs: account as waiting for IO, while waiting fot the flush bio
    completion
  btrfs: move dev stats accounting out of wait_dev_flush

 fs/btrfs/disk-io.c | 38 +++++++++++---------------------------
 fs/btrfs/volumes.c | 12 ++++++++++++
 fs/btrfs/volumes.h |  1 +
 3 files changed, 24 insertions(+), 27 deletions(-)

-- 
2.13.0