[Qemu-devel] [PATCH v5 0/4] block: ignore flush requests when storage is clean

["Denis V. Lunev" <den@openvz.org>]

Changes from v4:
- Moved to write generation scheme instead of dirty flag
- Added retry setup to IDE PIO and FLUSH requests

Changes from v3:
- Fixed a typo in commit message
- Rebased on Kevin'n origin/block

Changes from v2:
- Better comments
- Rebased on latest master

Changes from v1:
- Flush requests that should be skipped will now wait for completion
of any previous requests already in flight
- Fixed IDE and AHCI tests to dirty media for new flush behaviour
- Fixed a problem in IDE CMD_FLUSH_CACHE failure handling

Signed-off-by: Evgeny Yakovlev <eyakovlev@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Fam Zheng <famz@redhat.com>
CC: John Snow <jsnow@redhat.com>

Evgeny Yakovlev (4):
  ide: refactor retry_unit set and clear into separate function
  ide: set retry_unit for PIO and FLUSH requests
  tests: in IDE and AHCI tests perform DMA write before flushing
  block: ignore flush requests when storage is clean

 block.c                   |  3 +++
 block/io.c                | 18 ++++++++++++++++++
 hw/ide/core.c             | 24 ++++++++++++++++++------
 include/block/block_int.h |  5 +++++
 tests/ahci-test.c         | 34 ++++++++++++++++++++++++++++++++--
 tests/ide-test.c          | 43 +++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 119 insertions(+), 8 deletions(-)

-- 
2.1.4