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sheepdog: restart I/O when socket becomes ready in do_co_req()

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Currently, no one reenters the yielded coroutine.  This fixes it.

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
MORITA Kazutaka 2012-06-27 07:26:19 +09:00 committed by Kevin Wolf
parent 1b6ac9985a
commit 2dfcca3b68
1 changed files with 14 additions and 0 deletions
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14
block/sheepdog.c
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@ -577,10 +577,21 @@ out:
return ret;
}
static void restart_co_req(void *opaque)
{
Coroutine *co = opaque;
qemu_coroutine_enter(co, NULL);
}
static coroutine_fn int do_co_req(int sockfd, SheepdogReq *hdr, void *data,
unsigned int *wlen, unsigned int *rlen)
{
int ret;
Coroutine *co;
co = qemu_coroutine_self();
qemu_aio_set_fd_handler(sockfd, NULL, restart_co_req, NULL, co);
socket_set_block(sockfd);
ret = send_co_req(sockfd, hdr, data, wlen);
@ -588,6 +599,8 @@ static coroutine_fn int do_co_req(int sockfd, SheepdogReq *hdr, void *data,
goto out;
}
qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, NULL, co);
ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr));
if (ret < sizeof(*hdr)) {
error_report("failed to get a rsp, %s", strerror(errno));
@ -609,6 +622,7 @@ static coroutine_fn int do_co_req(int sockfd, SheepdogReq *hdr, void *data,
}
ret = 0;
out:
qemu_aio_set_fd_handler(sockfd, NULL, NULL, NULL, NULL);
socket_set_nonblock(sockfd);
return ret;
}