From df9a681dc9ad41c9cdeb9ecc5d060ba9abd27e01 Mon Sep 17 00:00:00 2001 From: Fam Zheng Date: Mon, 9 Nov 2015 18:16:54 +0800 Subject: qed: Implement .bdrv_drain The "need_check_timer" is used to clear the "NEED_CHECK" flag in the image header after a grace period once metadata update has finished. In compliance to the bdrv_drain semantics we should make sure it remains deleted once .bdrv_drain is called. We cannot reuse qed_need_check_timer_cb because here it doesn't satisfy the assertion. Do the "plug" and "flush" calls manually. Signed-off-by: Fam Zheng Reviewed-by: Kevin Wolf Message-id: 1447064214-29930-10-git-send-email-famz@redhat.com Signed-off-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- block/qed.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'block/qed.c') diff --git a/block/qed.c b/block/qed.c index 5ea05d4909..9b88895038 100644 --- a/block/qed.c +++ b/block/qed.c @@ -375,6 +375,18 @@ static void bdrv_qed_attach_aio_context(BlockDriverState *bs, } } +static void bdrv_qed_drain(BlockDriverState *bs) +{ + BDRVQEDState *s = bs->opaque; + + /* Cancel timer and start doing I/O that were meant to happen as if it + * fired, that way we get bdrv_drain() taking care of the ongoing requests + * correctly. */ + qed_cancel_need_check_timer(s); + qed_plug_allocating_write_reqs(s); + bdrv_aio_flush(s->bs, qed_clear_need_check, s); +} + static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { @@ -1676,6 +1688,7 @@ static BlockDriver bdrv_qed = { .bdrv_check = bdrv_qed_check, .bdrv_detach_aio_context = bdrv_qed_detach_aio_context, .bdrv_attach_aio_context = bdrv_qed_attach_aio_context, + .bdrv_drain = bdrv_qed_drain, }; static void bdrv_qed_init(void) -- cgit v1.2.3