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block: use BlockDriverState AioContext 

Drop the assumption that we're using the main AioContext.  Convert
qemu_aio_wait() to aio_poll() and qemu_bh_new() to aio_bh_new() so the
BlockDriverState AioContext is used.

Note there is still one qemu_aio_wait() left in bdrv_create() but we do
not have a BlockDriverState there and only main loop code invokes this
function.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2014-05-08 16:34:34 +02:00
parent 924fe1293c
commit 2572b37a47
1 changed files with 18 additions and 9 deletions
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27
block.c
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@ -2775,10 +2775,12 @@ static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset,
/* Fast-path if already in coroutine context */
bdrv_rw_co_entry(&rwco);
} else {
AioContext *aio_context = bdrv_get_aio_context(bs);
co = qemu_coroutine_create(bdrv_rw_co_entry);
qemu_coroutine_enter(co, &rwco);
while (rwco.ret == NOT_DONE) {
qemu_aio_wait();
aio_poll(aio_context, true);
}
}
return rwco.ret;
@ -4025,10 +4027,12 @@ int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
/* Fast-path if already in coroutine context */
bdrv_get_block_status_co_entry(&data);
} else {
AioContext *aio_context = bdrv_get_aio_context(bs);
co = qemu_coroutine_create(bdrv_get_block_status_co_entry);
qemu_coroutine_enter(co, &data);
while (!data.done) {
qemu_aio_wait();
aio_poll(aio_context, true);
}
}
return data.ret;
@ -4621,7 +4625,7 @@ static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
acb->is_write = is_write;
acb->qiov = qiov;
acb->bounce = qemu_blockalign(bs, qiov->size);
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_aio_bh_cb, acb);
if (is_write) {
qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size);
@ -4660,13 +4664,14 @@ typedef struct BlockDriverAIOCBCoroutine {
static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb)
{
AioContext *aio_context = bdrv_get_aio_context(blockacb->bs);
BlockDriverAIOCBCoroutine *acb =
container_of(blockacb, BlockDriverAIOCBCoroutine, common);
bool done = false;
acb->done = &done;
while (!done) {
qemu_aio_wait();
aio_poll(aio_context, true);
}
}
@ -4703,7 +4708,7 @@ static void coroutine_fn bdrv_co_do_rw(void *opaque)
acb->req.nb_sectors, acb->req.qiov, acb->req.flags);
}
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb);
acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb);
qemu_bh_schedule(acb->bh);
}
@ -4739,7 +4744,7 @@ static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque)
BlockDriverState *bs = acb->common.bs;
acb->req.error = bdrv_co_flush(bs);
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb);
acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb);
qemu_bh_schedule(acb->bh);
}
@ -4766,7 +4771,7 @@ static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque)
BlockDriverState *bs = acb->common.bs;
acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors);
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb);
acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb);
qemu_bh_schedule(acb->bh);
}
@ -5006,10 +5011,12 @@ int bdrv_flush(BlockDriverState *bs)
/* Fast-path if already in coroutine context */
bdrv_flush_co_entry(&rwco);
} else {
AioContext *aio_context = bdrv_get_aio_context(bs);
co = qemu_coroutine_create(bdrv_flush_co_entry);
qemu_coroutine_enter(co, &rwco);
while (rwco.ret == NOT_DONE) {
qemu_aio_wait();
aio_poll(aio_context, true);
}
}
@ -5119,10 +5126,12 @@ int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
/* Fast-path if already in coroutine context */
bdrv_discard_co_entry(&rwco);
} else {
AioContext *aio_context = bdrv_get_aio_context(bs);
co = qemu_coroutine_create(bdrv_discard_co_entry);
qemu_coroutine_enter(co, &rwco);
while (rwco.ret == NOT_DONE) {
qemu_aio_wait();
aio_poll(aio_context, true);
}
}