[0/8] loop: improve dio on backing file

Message

Ming Lei Oct. 25, 2021, 9:44 a.m. UTC

Hello,

Improve dio on backing file:

1) cover simple read/write via aio style(lo_rw_aio)

2) fallback to buffered io in case of dio failure

3) relax dio use condition and not check if lo->lo_offset & loop queue's
bs is aligned with backing queue

4) enable backing dio at default(RFC)


Ming Lei (8):
  loop: move flush_dcache_page to ->complete of request
  loop: remove always true check
  loop: add one helper for submitting IO on backing file
  loop: cover simple read/write via lo_rw_aio()
  loop: fallback to buffered IO in case of dio submission
  loop: relax loop dio use condition
  loop: remove lo->use_dio
  loop: use backing dio at default

 drivers/block/loop.c | 182 +++++++++++++------------------------------
 drivers/block/loop.h |   2 +-
 2 files changed, 57 insertions(+), 127 deletions(-)