[Qemu-block] [PATCH v2 0/3] potentially broken drive-mirror/drive-backup in bdrv_co_discard

[Denis V. Lunev]

Actually I have found this problem running iotest 132 for active async
mirror I have sent yesturday. Anyway, the problem is actual for current
backup/mirror implementation.

bdrv_co_discard must mark areas dirty after writing zeroes, it must call
before_write_notifier chain to push underlying data to backup and it also
must properly fill tracked request information.

Changes from v1:
- fixed problem in patch as pointed out by Vova
- ported to current (was made on top of active block mirror)
- minor spelling changes in commit messages

Signed-off-by: Denis V. Lunev <address@hidden>
Reviewed-by: Vladimir Sementsov-Ogievskiy<address@hidden>
Reviewed-by: Fam Zheng <address@hidden>
CC: Stefan Hajnoczi <address@hidden>
CC: Kevin Wolf <address@hidden>
CC: Max Reitz <address@hidden>

Denis V. Lunev (3):
  block: fixed BdrvTrackedRequest filling in bdrv_co_discard
  block: fix race in bdrv_co_discard with drive-mirror
  block: process before_write_notifiers in bdrv_co_discard

 block/io.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

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2.1.4