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rbd: check return values when scheduling aio

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If scheduling fails, the number of outstanding I/Os must be correct,
or there will be a hang when waiting for everything to be flushed.

Reviewed-by: Christian Brunner <chb@muc.de>
Reported-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Josh Durgin 2011-05-26 16:07:33 -07:00 committed by Kevin Wolf
parent fab5cf592c
commit 51a135287a
1 changed files with 20 additions and 4 deletions
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24
block/rbd.c
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@ -581,10 +581,14 @@ static BlockDriverAIOCB *rbd_aio_rw_vector(BlockDriverState *bs,
rbd_completion_t c;
int64_t off, size;
char *buf;
int r;
BDRVRBDState *s = bs->opaque;
acb = qemu_aio_get(&rbd_aio_pool, bs, cb, opaque);
if (!acb) {
return NULL;
}
acb->write = write;
acb->qiov = qiov;
acb->bounce = qemu_blockalign(bs, qiov->size);
@ -611,16 +615,28 @@ static BlockDriverAIOCB *rbd_aio_rw_vector(BlockDriverState *bs,
rcb->buf = buf;
rcb->s = acb->s;
rcb->size = size;
r = rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c);
if (r < 0) {
goto failed;
}
if (write) {
rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c);
rbd_aio_write(s->image, off, size, buf, c);
r = rbd_aio_write(s->image, off, size, buf, c);
} else {
rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c);
rbd_aio_read(s->image, off, size, buf, c);
r = rbd_aio_read(s->image, off, size, buf, c);
}
if (r < 0) {
goto failed;
}
return &acb->common;
failed:
qemu_free(rcb);
s->qemu_aio_count--;
qemu_aio_release(acb);
return NULL;
}
static BlockDriverAIOCB *qemu_rbd_aio_readv(BlockDriverState *bs,