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block-backend: allow blk_prw from coroutine context

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qcow2_create2 calls this.  Do not run a nested event loop, as that
breaks when aio_co_wake tries to queue the coroutine on the co_queue_wakeup
list of the currently running one.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170213135235.12274-4-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-02-13 14:52:20 +01:00 committed by Stefan Hajnoczi
parent 0c330a734b
commit 35f106e684
1 changed files with 8 additions and 4 deletions
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12
block/block-backend.c
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@ -880,7 +880,6 @@ static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf,
{
QEMUIOVector qiov;
struct iovec iov;
Coroutine *co;
BlkRwCo rwco;
iov = (struct iovec) {
@ -897,9 +896,14 @@ static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf,
.ret = NOT_DONE,
};
co = qemu_coroutine_create(co_entry, &rwco);
qemu_coroutine_enter(co);
BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE);
if (qemu_in_coroutine()) {
/* Fast-path if already in coroutine context */
co_entry(&rwco);
} else {
Coroutine *co = qemu_coroutine_create(co_entry, &rwco);
qemu_coroutine_enter(co);
BDRV_POLL_WHILE(blk_bs(blk), rwco.ret == NOT_DONE);
}
return rwco.ret;
}