aio: add AioPollFn and io_poll() interface

The new AioPollFn io_poll() argument to aio_set_fd_handler() and
aio_set_event_handler() is used in the next patch.

Keep this code change separate due to the number of files it touches.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20161201192652.9509-3-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

8 files changed, 33 insertions, 31 deletions

diff --git a/block/curl.c b/block/curl.c
index 0404c1b5fa..792fef8269 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -192,19 +192,19 @@ static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
     switch (action) {
         case CURL_POLL_IN:
             aio_set_fd_handler(s->aio_context, fd, false,
-                               curl_multi_read, NULL, state);
+                               curl_multi_read, NULL, NULL, state);
             break;
         case CURL_POLL_OUT:
             aio_set_fd_handler(s->aio_context, fd, false,
-                               NULL, curl_multi_do, state);
+                               NULL, curl_multi_do, NULL, state);
             break;
         case CURL_POLL_INOUT:
             aio_set_fd_handler(s->aio_context, fd, false,
-                               curl_multi_read, curl_multi_do, state);
+                               curl_multi_read, curl_multi_do, NULL, state);
             break;
         case CURL_POLL_REMOVE:
             aio_set_fd_handler(s->aio_context, fd, false,
-                               NULL, NULL, NULL);
+                               NULL, NULL, NULL, NULL);
             break;
     }
 
diff --git a/block/iscsi.c b/block/iscsi.c
index 0960929d57..6aeeb9ec4f 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -362,6 +362,7 @@ iscsi_set_events(IscsiLun *iscsilun)
                            false,
                            (ev & POLLIN) ? iscsi_process_read : NULL,
                            (ev & POLLOUT) ? iscsi_process_write : NULL,
+                           NULL,
                            iscsilun);
         iscsilun->events = ev;
     }
@@ -1526,7 +1527,7 @@ static void iscsi_detach_aio_context(BlockDriverState *bs)
     IscsiLun *iscsilun = bs->opaque;
 
     aio_set_fd_handler(iscsilun->aio_context, iscsi_get_fd(iscsilun->iscsi),
-                       false, NULL, NULL, NULL);
+                       false, NULL, NULL, NULL, NULL);
     iscsilun->events = 0;
 
     if (iscsilun->nop_timer) {
diff --git a/block/linux-aio.c b/block/linux-aio.c
index 1685ec29a3..69c4ed52ca 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -439,7 +439,7 @@ BlockAIOCB *laio_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
 
 void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context)
 {
-    aio_set_event_notifier(old_context, &s->e, false, NULL);
+    aio_set_event_notifier(old_context, &s->e, false, NULL, NULL);
     qemu_bh_delete(s->completion_bh);
 }
 
@@ -448,7 +448,7 @@ void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context)
     s->aio_context = new_context;
     s->completion_bh = aio_bh_new(new_context, qemu_laio_completion_bh, s);
     aio_set_event_notifier(new_context, &s->e, false,
-                           qemu_laio_completion_cb);
+                           qemu_laio_completion_cb, NULL);
 }
 
 LinuxAioState *laio_init(void)
diff --git a/block/nbd-client.c b/block/nbd-client.c
index 3779c6c999..06f1532805 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -145,7 +145,7 @@ static int nbd_co_send_request(BlockDriverState *bs,
     aio_context = bdrv_get_aio_context(bs);
 
     aio_set_fd_handler(aio_context, s->sioc->fd, false,
-                       nbd_reply_ready, nbd_restart_write, bs);
+                       nbd_reply_ready, nbd_restart_write, NULL, bs);
     if (qiov) {
         qio_channel_set_cork(s->ioc, true);
         rc = nbd_send_request(s->ioc, request);
@@ -161,7 +161,7 @@ static int nbd_co_send_request(BlockDriverState *bs,
         rc = nbd_send_request(s->ioc, request);
     }
     aio_set_fd_handler(aio_context, s->sioc->fd, false,
-                       nbd_reply_ready, NULL, bs);
+                       nbd_reply_ready, NULL, NULL, bs);
     s->send_coroutine = NULL;
     qemu_co_mutex_unlock(&s->send_mutex);
     return rc;
@@ -366,14 +366,14 @@ void nbd_client_detach_aio_context(BlockDriverState *bs)
 {
     aio_set_fd_handler(bdrv_get_aio_context(bs),
                        nbd_get_client_session(bs)->sioc->fd,
-                       false, NULL, NULL, NULL);
+                       false, NULL, NULL, NULL, NULL);
 }
 
 void nbd_client_attach_aio_context(BlockDriverState *bs,
                                    AioContext *new_context)
 {
     aio_set_fd_handler(new_context, nbd_get_client_session(bs)->sioc->fd,
-                       false, nbd_reply_ready, NULL, bs);
+                       false, nbd_reply_ready, NULL, NULL, bs);
 }
 
 void nbd_client_close(BlockDriverState *bs)
diff --git a/block/nfs.c b/block/nfs.c
index a490660027..a564340d15 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -197,7 +197,8 @@ static void nfs_set_events(NFSClient *client)
         aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
                            false,
                            (ev & POLLIN) ? nfs_process_read : NULL,
-                           (ev & POLLOUT) ? nfs_process_write : NULL, client);
+                           (ev & POLLOUT) ? nfs_process_write : NULL,
+                           NULL, client);
 
     }
     client->events = ev;
@@ -395,7 +396,7 @@ static void nfs_detach_aio_context(BlockDriverState *bs)
     NFSClient *client = bs->opaque;
 
     aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
-                       false, NULL, NULL, NULL);
+                       false, NULL, NULL, NULL, NULL);
     client->events = 0;
 }
 
@@ -415,7 +416,7 @@ static void nfs_client_close(NFSClient *client)
             nfs_close(client->context, client->fh);
         }
         aio_set_fd_handler(client->aio_context, nfs_get_fd(client->context),
-                           false, NULL, NULL, NULL);
+                           false, NULL, NULL, NULL, NULL);
         nfs_destroy_context(client->context);
     }
     memset(client, 0, sizeof(NFSClient));
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 4c9af89180..5637e0cd37 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -664,7 +664,7 @@ static coroutine_fn void do_co_req(void *opaque)
 
     co = qemu_coroutine_self();
     aio_set_fd_handler(srco->aio_context, sockfd, false,
-                       NULL, restart_co_req, co);
+                       NULL, restart_co_req, NULL, co);
 
     ret = send_co_req(sockfd, hdr, data, wlen);
     if (ret < 0) {
@@ -672,7 +672,7 @@ static coroutine_fn void do_co_req(void *opaque)
     }
 
     aio_set_fd_handler(srco->aio_context, sockfd, false,
-                       restart_co_req, NULL, co);
+                       restart_co_req, NULL, NULL, co);
 
     ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr));
     if (ret != sizeof(*hdr)) {
@@ -698,7 +698,7 @@ out:
     /* there is at most one request for this sockfd, so it is safe to
      * set each handler to NULL. */
     aio_set_fd_handler(srco->aio_context, sockfd, false,
-                       NULL, NULL, NULL);
+                       NULL, NULL, NULL, NULL);
 
     srco->ret = ret;
     srco->finished = true;
@@ -760,7 +760,7 @@ static coroutine_fn void reconnect_to_sdog(void *opaque)
     AIOReq *aio_req, *next;
 
     aio_set_fd_handler(s->aio_context, s->fd, false, NULL,
-                       NULL, NULL);
+                       NULL, NULL, NULL);
     close(s->fd);
     s->fd = -1;
 
@@ -964,7 +964,7 @@ static int get_sheep_fd(BDRVSheepdogState *s, Error **errp)
     }
 
     aio_set_fd_handler(s->aio_context, fd, false,
-                       co_read_response, NULL, s);
+                       co_read_response, NULL, NULL, s);
     return fd;
 }
 
@@ -1226,7 +1226,7 @@ static void coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
     qemu_co_mutex_lock(&s->lock);
     s->co_send = qemu_coroutine_self();
     aio_set_fd_handler(s->aio_context, s->fd, false,
-                       co_read_response, co_write_request, s);
+                       co_read_response, co_write_request, NULL, s);
     socket_set_cork(s->fd, 1);
 
     /* send a header */
@@ -1245,7 +1245,7 @@ static void coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
 out:
     socket_set_cork(s->fd, 0);
     aio_set_fd_handler(s->aio_context, s->fd, false,
-                       co_read_response, NULL, s);
+                       co_read_response, NULL, NULL, s);
     s->co_send = NULL;
     qemu_co_mutex_unlock(&s->lock);
 }
@@ -1396,7 +1396,7 @@ static void sd_detach_aio_context(BlockDriverState *bs)
     BDRVSheepdogState *s = bs->opaque;
 
     aio_set_fd_handler(s->aio_context, s->fd, false, NULL,
-                       NULL, NULL);
+                       NULL, NULL, NULL);
 }
 
 static void sd_attach_aio_context(BlockDriverState *bs,
@@ -1406,7 +1406,7 @@ static void sd_attach_aio_context(BlockDriverState *bs,
 
     s->aio_context = new_context;
     aio_set_fd_handler(new_context, s->fd, false,
-                       co_read_response, NULL, s);
+                       co_read_response, NULL, NULL, s);
 }
 
 /* TODO Convert to fine grained options */
@@ -1520,7 +1520,7 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
     return 0;
 out:
     aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd,
-                       false, NULL, NULL, NULL);
+                       false, NULL, NULL, NULL, NULL);
     if (s->fd >= 0) {
         closesocket(s->fd);
     }
@@ -1559,7 +1559,7 @@ static void sd_reopen_commit(BDRVReopenState *state)
 
     if (s->fd) {
         aio_set_fd_handler(s->aio_context, s->fd, false,
-                           NULL, NULL, NULL);
+                           NULL, NULL, NULL, NULL);
         closesocket(s->fd);
     }
 
@@ -1583,7 +1583,7 @@ static void sd_reopen_abort(BDRVReopenState *state)
 
     if (re_s->fd) {
         aio_set_fd_handler(s->aio_context, re_s->fd, false,
-                           NULL, NULL, NULL);
+                           NULL, NULL, NULL, NULL);
         closesocket(re_s->fd);
     }
 
@@ -1972,7 +1972,7 @@ static void sd_close(BlockDriverState *bs)
     }
 
     aio_set_fd_handler(bdrv_get_aio_context(bs), s->fd,
-                       false, NULL, NULL, NULL);
+                       false, NULL, NULL, NULL, NULL);
     closesocket(s->fd);
     g_free(s->host_spec);
 }
diff --git a/block/ssh.c b/block/ssh.c
index 15ed2818c5..e0edf20f78 100644
--- a/block/ssh.c
+++ b/block/ssh.c
@@ -911,7 +911,7 @@ static coroutine_fn void set_fd_handler(BDRVSSHState *s, BlockDriverState *bs)
             rd_handler, wr_handler);
 
     aio_set_fd_handler(bdrv_get_aio_context(bs), s->sock,
-                       false, rd_handler, wr_handler, co);
+                       false, rd_handler, wr_handler, NULL, co);
 }
 
 static coroutine_fn void clear_fd_handler(BDRVSSHState *s,
@@ -919,7 +919,7 @@ static coroutine_fn void clear_fd_handler(BDRVSSHState *s,
 {
     DPRINTF("s->sock=%d", s->sock);
     aio_set_fd_handler(bdrv_get_aio_context(bs), s->sock,
-                       false, NULL, NULL, NULL);
+                       false, NULL, NULL, NULL, NULL);
 }
 
 /* A non-blocking call returned EAGAIN, so yield, ensuring the
diff --git a/block/win32-aio.c b/block/win32-aio.c
index 95e3ab1541..8cdf73b00d 100644
--- a/block/win32-aio.c
+++ b/block/win32-aio.c
@@ -175,7 +175,7 @@ int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile)
 void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
                                   AioContext *old_context)
 {
-    aio_set_event_notifier(old_context, &aio->e, false, NULL);
+    aio_set_event_notifier(old_context, &aio->e, false, NULL, NULL);
     aio->is_aio_context_attached = false;
 }
 
@@ -184,7 +184,7 @@ void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
 {
     aio->is_aio_context_attached = true;
     aio_set_event_notifier(new_context, &aio->e, false,
-                           win32_aio_completion_cb);
+                           win32_aio_completion_cb, NULL);
 }
 
 QEMUWin32AIOState *win32_aio_init(void)