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block: invoke .bdrv_drain callback in coroutine context and from AioContext

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This will let the callback take a CoMutex in the next patch.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20170629132749.997-8-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-06-29 15:27:45 +02:00 committed by Fam Zheng
parent e7569c1829
commit 61124f03ab
3 changed files with 37 additions and 13 deletions
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42
block/io.c
View file

@ -149,6 +149,37 @@ bool bdrv_requests_pending(BlockDriverState *bs)
return false;
}
typedef struct {
Coroutine *co;
BlockDriverState *bs;
bool done;
} BdrvCoDrainData;
static void coroutine_fn bdrv_drain_invoke_entry(void *opaque)
{
BdrvCoDrainData *data = opaque;
BlockDriverState *bs = data->bs;
bs->drv->bdrv_co_drain(bs);
/* Set data->done before reading bs->wakeup. */
atomic_mb_set(&data->done, true);
bdrv_wakeup(bs);
}
static void bdrv_drain_invoke(BlockDriverState *bs)
{
BdrvCoDrainData data = { .bs = bs, .done = false };
if (!bs->drv || !bs->drv->bdrv_co_drain) {
return;
}
data.co = qemu_coroutine_create(bdrv_drain_invoke_entry, &data);
bdrv_coroutine_enter(bs, data.co);
BDRV_POLL_WHILE(bs, !data.done);
}
static bool bdrv_drain_recurse(BlockDriverState *bs)
{
BdrvChild *child, *tmp;
@ -156,9 +187,8 @@ static bool bdrv_drain_recurse(BlockDriverState *bs)
waited = BDRV_POLL_WHILE(bs, atomic_read(&bs->in_flight) > 0);
if (bs->drv && bs->drv->bdrv_drain) {
bs->drv->bdrv_drain(bs);
}
/* Ensure any pending metadata writes are submitted to bs->file. */
bdrv_drain_invoke(bs);
QLIST_FOREACH_SAFE(child, &bs->children, next, tmp) {
BlockDriverState *bs = child->bs;
@ -184,12 +214,6 @@ static bool bdrv_drain_recurse(BlockDriverState *bs)
return waited;
}
typedef struct {
Coroutine *co;
BlockDriverState *bs;
bool done;
} BdrvCoDrainData;
static void bdrv_co_drain_bh_cb(void *opaque)
{
BdrvCoDrainData *data = opaque;

6
block/qed.c
View file

@ -350,7 +350,7 @@ static void bdrv_qed_attach_aio_context(BlockDriverState *bs,
}
}
static void bdrv_qed_drain(BlockDriverState *bs)
static void coroutine_fn bdrv_qed_co_drain(BlockDriverState *bs)
{
BDRVQEDState *s = bs->opaque;
@ -359,7 +359,7 @@ static void bdrv_qed_drain(BlockDriverState *bs)
*/
if (s->need_check_timer && timer_pending(s->need_check_timer)) {
qed_cancel_need_check_timer(s);
qed_need_check_timer_cb(s);
qed_need_check_timer_entry(s);
}
}
@ -1548,7 +1548,7 @@ 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,
.bdrv_co_drain = bdrv_qed_co_drain,
};
static void bdrv_qed_init(void)

2
include/block/block_int.h
View file

@ -324,7 +324,7 @@ struct BlockDriver {
* Drain and stop any internal sources of requests in the driver, and
* remain so until next I/O callback (e.g. bdrv_co_writev) is called.
*/
void (*bdrv_drain)(BlockDriverState *bs);
void coroutine_fn (*bdrv_co_drain)(BlockDriverState *bs);
void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child,
Error **errp);