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block: plug whole tree at once, introduce bdrv_io_unplugged_begin/end

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Extract the handling of io_plug "depth" from linux-aio.c and let the
main bdrv_drain loop do nothing but wait on I/O.

Like the two newly introduced functions, bdrv_io_plug and bdrv_io_unplug
now operate on all children.  The visit order is now symmetrical between
plug and unplug, making it possible for formats to implement plug/unplug.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-04-07 18:33:34 +02:00 • committed by Kevin Wolf
parent ce0f141259
commit 6b98bd6495
6 changed files with 71 additions and 44 deletions
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13
block/linux-aio.c
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@ -220,19 +220,16 @@ void laio_io_plug(BlockDriverState *bs, void *aio_ctx)
{
struct qemu_laio_state *s = aio_ctx;
s->io_q.plugged++;
assert(!s->io_q.plugged);
s->io_q.plugged = 1;
}
void laio_io_unplug(BlockDriverState *bs, void *aio_ctx, bool unplug)
void laio_io_unplug(BlockDriverState *bs, void *aio_ctx)
{
struct qemu_laio_state *s = aio_ctx;
assert(s->io_q.plugged > 0 || !unplug);
if (unplug && --s->io_q.plugged > 0) {
return;
}
assert(s->io_q.plugged);
s->io_q.plugged = 0;
if (!s->io_q.blocked && !QSIMPLEQ_EMPTY(&s->io_q.pending)) {
ioq_submit(s);
}