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Merge remote-tracking branch 'stefanha/block-next' into staging 

# By Stefan Hajnoczi
# Via Stefan Hajnoczi
* stefanha/block-next:
  aio: drop io_flush argument
  tests: drop event_active_cb()
  thread-pool: drop thread_pool_active()
  dataplane/virtio-blk: drop flush_true() and flush_io()
  block/ssh: drop return_true()
  block/sheepdog: drop have_co_req() and aio_flush_request()
  block/rbd: drop qemu_rbd_aio_flush_cb()
  block/nbd: drop nbd_have_request()
  block/linux-aio: drop qemu_laio_completion_cb()
  block/iscsi: drop iscsi_process_flush()
  block/gluster: drop qemu_gluster_aio_flush_cb()
  block/curl: drop curl_aio_flush()
  aio: stop using .io_flush()
  tests: adjust test-thread-pool to new aio_poll() semantics
  tests: adjust test-aio to new aio_poll() semantics
  dataplane/virtio-blk: check exit conditions before aio_poll()
  block: stop relying on io_flush() in bdrv_drain_all()
  block: ensure bdrv_drain_all() works during bdrv_delete()

Message-id: 1376921877-9576-1-git-send-email-stefanha@redhat.com
Signed-off-by: Anthony Liguori <anthony@codemonkey.ws>
This commit is contained in:
Anthony Liguori 2013-08-20 09:52:18 -05:00
parent 72420ce9f0 f2e5dca46b
commit 9176e8fb8f
19 changed files with 163 additions and 289 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
aio-posix.c
View File

@ -23,7 +23,6 @@ struct AioHandler
GPollFD pfd;
IOHandler *io_read;
IOHandler *io_write;
AioFlushHandler *io_flush;
int deleted;
int pollfds_idx;
void *opaque;
@ -47,7 +46,6 @@ void aio_set_fd_handler(AioContext *ctx,
int fd,
IOHandler *io_read,
IOHandler *io_write,
AioFlushHandler *io_flush,
void *opaque)
{
AioHandler *node;
@ -84,7 +82,6 @@ void aio_set_fd_handler(AioContext *ctx,
/* Update handler with latest information */
node->io_read = io_read;
node->io_write = io_write;
node->io_flush = io_flush;
node->opaque = opaque;
node->pollfds_idx = -1;
@ -97,12 +94,10 @@ void aio_set_fd_handler(AioContext *ctx,
void aio_set_event_notifier(AioContext *ctx,
EventNotifier *notifier,
EventNotifierHandler *io_read,
AioFlushEventNotifierHandler *io_flush)
EventNotifierHandler *io_read)
{
aio_set_fd_handler(ctx, event_notifier_get_fd(notifier),
(IOHandler *)io_read, NULL,
(AioFlushHandler *)io_flush, notifier);
(IOHandler *)io_read, NULL, notifier);
}
bool aio_pending(AioContext *ctx)
@ -147,7 +142,11 @@ static bool aio_dispatch(AioContext *ctx)
(revents & (G_IO_IN | G_IO_HUP | G_IO_ERR)) &&
node->io_read) {
node->io_read(node->opaque);
progress = true;
/* aio_notify() does not count as progress */
if (node->opaque != &ctx->notifier) {
progress = true;
}
}
if (!node->deleted &&
(revents & (G_IO_OUT | G_IO_ERR)) &&
@ -173,7 +172,7 @@ bool aio_poll(AioContext *ctx, bool blocking)
{
AioHandler *node;
int ret;
bool busy, progress;
bool progress;
progress = false;
@ -200,20 +199,8 @@ bool aio_poll(AioContext *ctx, bool blocking)
g_array_set_size(ctx->pollfds, 0);
/* fill pollfds */
busy = false;
QLIST_FOREACH(node, &ctx->aio_handlers, node) {
node->pollfds_idx = -1;
/* If there aren't pending AIO operations, don't invoke callbacks.
* Otherwise, if there are no AIO requests, qemu_aio_wait() would
* wait indefinitely.
*/
if (!node->deleted && node->io_flush) {
if (node->io_flush(node->opaque) == 0) {
continue;
}
busy = true;
}
if (!node->deleted && node->pfd.events) {
GPollFD pfd = {
.fd = node->pfd.fd,
@ -226,8 +213,8 @@ bool aio_poll(AioContext *ctx, bool blocking)
ctx->walking_handlers--;
/* No AIO operations? Get us out of here */
if (!busy) {
/* early return if we only have the aio_notify() fd */
if (ctx->pollfds->len == 1) {
return progress;
}
@ -250,6 +237,5 @@ bool aio_poll(AioContext *ctx, bool blocking)
}
}
assert(progress || busy);
return true;
return progress;
}

37
aio-win32.c
View File

@ -23,7 +23,6 @@
struct AioHandler {
EventNotifier *e;
EventNotifierHandler *io_notify;
AioFlushEventNotifierHandler *io_flush;
GPollFD pfd;
int deleted;
QLIST_ENTRY(AioHandler) node;
@ -31,8 +30,7 @@ struct AioHandler {
void aio_set_event_notifier(AioContext *ctx,
EventNotifier *e,
EventNotifierHandler *io_notify,
AioFlushEventNotifierHandler *io_flush)
EventNotifierHandler *io_notify)
{
AioHandler *node;
@ -73,7 +71,6 @@ void aio_set_event_notifier(AioContext *ctx,
}
/* Update handler with latest information */
node->io_notify = io_notify;
node->io_flush = io_flush;
}
aio_notify(ctx);
@ -96,7 +93,7 @@ bool aio_poll(AioContext *ctx, bool blocking)
{
AioHandler *node;
HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
bool busy, progress;
bool progress;
int count;
progress = false;
@ -126,7 +123,11 @@ bool aio_poll(AioContext *ctx, bool blocking)
if (node->pfd.revents && node->io_notify) {
node->pfd.revents = 0;
node->io_notify(node->e);
progress = true;
/* aio_notify() does not count as progress */
if (node->opaque != &ctx->notifier) {
progress = true;
}
}
tmp = node;
@ -147,19 +148,8 @@ bool aio_poll(AioContext *ctx, bool blocking)
ctx->walking_handlers++;
/* fill fd sets */
busy = false;
count = 0;
QLIST_FOREACH(node, &ctx->aio_handlers, node) {
/* If there aren't pending AIO operations, don't invoke callbacks.
* Otherwise, if there are no AIO requests, qemu_aio_wait() would
* wait indefinitely.
*/
if (!node->deleted && node->io_flush) {
if (node->io_flush(node->e) == 0) {
continue;
}
busy = true;
}
if (!node->deleted && node->io_notify) {
events[count++] = event_notifier_get_handle(node->e);
}
@ -167,8 +157,8 @@ bool aio_poll(AioContext *ctx, bool blocking)
ctx->walking_handlers--;
/* No AIO operations? Get us out of here */
if (!busy) {
/* early return if we only have the aio_notify() fd */
if (count == 1) {
return progress;
}
@ -196,7 +186,11 @@ bool aio_poll(AioContext *ctx, bool blocking)
event_notifier_get_handle(node->e) == events[ret - WAIT_OBJECT_0] &&
node->io_notify) {
node->io_notify(node->e);
progress = true;
/* aio_notify() does not count as progress */
if (node->opaque != &ctx->notifier) {
progress = true;
}
}
tmp = node;
@ -214,6 +208,5 @@ bool aio_poll(AioContext *ctx, bool blocking)
events[ret - WAIT_OBJECT_0] = events[--count];
}
assert(progress || busy);
return true;
return progress;
}

4
async.c
View File

@ -201,7 +201,7 @@ aio_ctx_finalize(GSource *source)
AioContext *ctx = (AioContext *) source;
thread_pool_free(ctx->thread_pool);
aio_set_event_notifier(ctx, &ctx->notifier, NULL, NULL);
aio_set_event_notifier(ctx, &ctx->notifier, NULL);
event_notifier_cleanup(&ctx->notifier);
qemu_mutex_destroy(&ctx->bh_lock);
g_array_free(ctx->pollfds, TRUE);
@ -243,7 +243,7 @@ AioContext *aio_context_new(void)
event_notifier_init(&ctx->notifier, false);
aio_set_event_notifier(ctx, &ctx->notifier,
(EventNotifierHandler *)
event_notifier_test_and_clear, NULL);
event_notifier_test_and_clear);
return ctx;
}

49
block.c
View File

@ -148,7 +148,6 @@ static void bdrv_block_timer(void *opaque)
void bdrv_io_limits_enable(BlockDriverState *bs)
{
qemu_co_queue_init(&bs->throttled_reqs);
bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs);
bs->io_limits_enabled = true;
}
@ -306,6 +305,7 @@ BlockDriverState *bdrv_new(const char *device_name)
bdrv_iostatus_disable(bs);
notifier_list_init(&bs->close_notifiers);
notifier_with_return_list_init(&bs->before_write_notifiers);
qemu_co_queue_init(&bs->throttled_reqs);
return bs;
}
@ -1428,6 +1428,35 @@ void bdrv_close_all(void)
}
}
/* Check if any requests are in-flight (including throttled requests) */
static bool bdrv_requests_pending(BlockDriverState *bs)
{
if (!QLIST_EMPTY(&bs->tracked_requests)) {
return true;
}
if (!qemu_co_queue_empty(&bs->throttled_reqs)) {
return true;
}
if (bs->file && bdrv_requests_pending(bs->file)) {
return true;
}
if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) {
return true;
}
return false;
}
static bool bdrv_requests_pending_all(void)
{
BlockDriverState *bs;
QTAILQ_FOREACH(bs, &bdrv_states, list) {
if (bdrv_requests_pending(bs)) {
return true;
}
}
return false;
}
/*
* Wait for pending requests to complete across all BlockDriverStates
*
@ -1442,12 +1471,11 @@ void bdrv_close_all(void)
*/
void bdrv_drain_all(void)
{
/* Always run first iteration so any pending completion BHs run */
bool busy = true;
BlockDriverState *bs;
bool busy;
do {
busy = qemu_aio_wait();
while (busy) {
/* FIXME: We do not have timer support here, so this is effectively
* a busy wait.
*/
@ -1456,12 +1484,9 @@ void bdrv_drain_all(void)
busy = true;
}
}
} while (busy);
/* If requests are still pending there is a bug somewhere */
QTAILQ_FOREACH(bs, &bdrv_states, list) {
assert(QLIST_EMPTY(&bs->tracked_requests));
assert(qemu_co_queue_empty(&bs->throttled_reqs));
busy = bdrv_requests_pending_all();
busy |= aio_poll(qemu_get_aio_context(), busy);
}
}
@ -1606,11 +1631,11 @@ void bdrv_delete(BlockDriverState *bs)
assert(!bs->job);
assert(!bs->in_use);
bdrv_close(bs);
/* remove from list, if necessary */
bdrv_make_anon(bs);
bdrv_close(bs);
g_free(bs);
}

25
block/curl.c
View File

@ -86,7 +86,6 @@ typedef struct BDRVCURLState {
static void curl_clean_state(CURLState *s);
static void curl_multi_do(void *arg);
static int curl_aio_flush(void *opaque);
static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
void *s, void *sp)
@ -94,17 +93,16 @@ static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
switch (action) {
case CURL_POLL_IN:
qemu_aio_set_fd_handler(fd, curl_multi_do, NULL, curl_aio_flush, s);
qemu_aio_set_fd_handler(fd, curl_multi_do, NULL, s);
break;
case CURL_POLL_OUT:
qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, curl_aio_flush, s);
qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, s);
break;
case CURL_POLL_INOUT:
qemu_aio_set_fd_handler(fd, curl_multi_do, curl_multi_do,
curl_aio_flush, s);
qemu_aio_set_fd_handler(fd, curl_multi_do, curl_multi_do, s);
break;
case CURL_POLL_REMOVE:
qemu_aio_set_fd_handler(fd, NULL, NULL, NULL, NULL);
qemu_aio_set_fd_handler(fd, NULL, NULL, NULL);
break;
}
@ -495,21 +493,6 @@ out_noclean:
return -EINVAL;
}
static int curl_aio_flush(void *opaque)
{
BDRVCURLState *s = opaque;
int i, j;
for (i=0; i < CURL_NUM_STATES; i++) {
for(j=0; j < CURL_NUM_ACB; j++) {
if (s->states[i].acb[j]) {
return 1;
}
}
}
return 0;
}
static void curl_aio_cancel(BlockDriverAIOCB *blockacb)
{
// Do we have to implement canceling? Seems to work without...

23
block/gluster.c
View File

@ -32,7 +32,6 @@ typedef struct BDRVGlusterState {
struct glfs *glfs;
int fds[2];
struct glfs_fd *fd;
int qemu_aio_count;
int event_reader_pos;
GlusterAIOCB *event_acb;
} BDRVGlusterState;
@ -247,7 +246,6 @@ static void qemu_gluster_complete_aio(GlusterAIOCB *acb, BDRVGlusterState *s)
ret = -EIO; /* Partial read/write - fail it */
}
s->qemu_aio_count--;
qemu_aio_release(acb);
cb(opaque, ret);
if (finished) {
@ -275,13 +273,6 @@ static void qemu_gluster_aio_event_reader(void *opaque)
} while (ret < 0 && errno == EINTR);
}
static int qemu_gluster_aio_flush_cb(void *opaque)
{
BDRVGlusterState *s = opaque;
return (s->qemu_aio_count > 0);
}
/* TODO Convert to fine grained options */
static QemuOptsList runtime_opts = {
.name = "gluster",
@ -348,7 +339,7 @@ static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
}
fcntl(s->fds[GLUSTER_FD_READ], F_SETFL, O_NONBLOCK);
qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ],
qemu_gluster_aio_event_reader, NULL, qemu_gluster_aio_flush_cb, s);
qemu_gluster_aio_event_reader, NULL, s);
out:
qemu_opts_del(opts);
@ -445,11 +436,9 @@ static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
qemu_mutex_lock_iothread(); /* We are in gluster thread context */
acb->common.cb(acb->common.opaque, -EIO);
qemu_aio_release(acb);
s->qemu_aio_count--;
close(s->fds[GLUSTER_FD_READ]);
close(s->fds[GLUSTER_FD_WRITE]);
qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL,
NULL);
qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL);
bs->drv = NULL; /* Make the disk inaccessible */
qemu_mutex_unlock_iothread();
}
@ -467,7 +456,6 @@ static BlockDriverAIOCB *qemu_gluster_aio_rw(BlockDriverState *bs,
offset = sector_num * BDRV_SECTOR_SIZE;
size = nb_sectors * BDRV_SECTOR_SIZE;
s->qemu_aio_count++;
acb = qemu_aio_get(&gluster_aiocb_info, bs, cb, opaque);
acb->size = size;
@ -488,7 +476,6 @@ static BlockDriverAIOCB *qemu_gluster_aio_rw(BlockDriverState *bs,
return &acb->common;
out:
s->qemu_aio_count--;
qemu_aio_release(acb);
return NULL;
}
@ -531,7 +518,6 @@ static BlockDriverAIOCB *qemu_gluster_aio_flush(BlockDriverState *bs,
acb->size = 0;
acb->ret = 0;
acb->finished = NULL;
s->qemu_aio_count++;
ret = glfs_fsync_async(s->fd, &gluster_finish_aiocb, acb);
if (ret < 0) {
@ -540,7 +526,6 @@ static BlockDriverAIOCB *qemu_gluster_aio_flush(BlockDriverState *bs,
return &acb->common;
out:
s->qemu_aio_count--;
qemu_aio_release(acb);
return NULL;
}
@ -563,7 +548,6 @@ static BlockDriverAIOCB *qemu_gluster_aio_discard(BlockDriverState *bs,
acb->size = 0;
acb->ret = 0;
acb->finished = NULL;
s->qemu_aio_count++;
ret = glfs_discard_async(s->fd, offset, size, &gluster_finish_aiocb, acb);
if (ret < 0) {
@ -572,7 +556,6 @@ static BlockDriverAIOCB *qemu_gluster_aio_discard(BlockDriverState *bs,
return &acb->common;
out:
s->qemu_aio_count--;
qemu_aio_release(acb);
return NULL;
}
@ -611,7 +594,7 @@ static void qemu_gluster_close(BlockDriverState *bs)
close(s->fds[GLUSTER_FD_READ]);
close(s->fds[GLUSTER_FD_WRITE]);
qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL, NULL);
qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL);
if (s->fd) {
glfs_close(s->fd);

10
block/iscsi.c
View File

@ -146,13 +146,6 @@ static const AIOCBInfo iscsi_aiocb_info = {
static void iscsi_process_read(void *arg);
static void iscsi_process_write(void *arg);
static int iscsi_process_flush(void *arg)
{
IscsiLun *iscsilun = arg;
return iscsi_queue_length(iscsilun->iscsi) > 0;
}
static void
iscsi_set_events(IscsiLun *iscsilun)
{
@ -166,7 +159,6 @@ iscsi_set_events(IscsiLun *iscsilun)
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi),
iscsi_process_read,
(ev & POLLOUT) ? iscsi_process_write : NULL,
iscsi_process_flush,
iscsilun);
}
@ -1215,7 +1207,7 @@ static void iscsi_close(BlockDriverState *bs)
qemu_del_timer(iscsilun->nop_timer);
qemu_free_timer(iscsilun->nop_timer);
}
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL, NULL);
qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL);
iscsi_destroy_context(iscsi);
memset(iscsilun, 0, sizeof(IscsiLun));
}

18
block/linux-aio.c
View File

@ -39,7 +39,6 @@ struct qemu_laiocb {
struct qemu_laio_state {
io_context_t ctx;
EventNotifier e;
int count;
};
static inline ssize_t io_event_ret(struct io_event *ev)
@ -55,8 +54,6 @@ static void qemu_laio_process_completion(struct qemu_laio_state *s,
{
int ret;
s->count--;
ret = laiocb->ret;
if (ret != -ECANCELED) {
if (ret == laiocb->nbytes) {
@ -101,13 +98,6 @@ static void qemu_laio_completion_cb(EventNotifier *e)
}
}
static int qemu_laio_flush_cb(EventNotifier *e)
{
struct qemu_laio_state *s = container_of(e, struct qemu_laio_state, e);
return (s->count > 0) ? 1 : 0;
}
static void laio_cancel(BlockDriverAIOCB *blockacb)
{
struct qemu_laiocb *laiocb = (struct qemu_laiocb *)blockacb;
@ -177,14 +167,11 @@ BlockDriverAIOCB *laio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
goto out_free_aiocb;
}
io_set_eventfd(&laiocb->iocb, event_notifier_get_fd(&s->e));
s->count++;
if (io_submit(s->ctx, 1, &iocbs) < 0)
goto out_dec_count;
goto out_free_aiocb;
return &laiocb->common;
out_dec_count:
s->count--;
out_free_aiocb:
qemu_aio_release(laiocb);
return NULL;
@ -203,8 +190,7 @@ void *laio_init(void)
goto out_close_efd;
}
qemu_aio_set_event_notifier(&s->e, qemu_laio_completion_cb,
qemu_laio_flush_cb);
qemu_aio_set_event_notifier(&s->e, qemu_laio_completion_cb);
return s;

18
block/nbd.c
View File

@ -279,13 +279,6 @@ static void nbd_coroutine_start(BDRVNBDState *s, struct nbd_request *request)
request->handle = INDEX_TO_HANDLE(s, i);
}
static int nbd_have_request(void *opaque)
{
BDRVNBDState *s = opaque;
return s->in_flight > 0;
}
static void nbd_reply_ready(void *opaque)
{
BDRVNBDState *s = opaque;
@ -341,8 +334,7 @@ static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request,
qemu_co_mutex_lock(&s->send_mutex);
s->send_coroutine = qemu_coroutine_self();
qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write,
nbd_have_request, s);
qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, nbd_restart_write, s);
if (qiov) {
if (!s->is_unix) {
socket_set_cork(s->sock, 1);
@ -361,8 +353,7 @@ static int nbd_co_send_request(BDRVNBDState *s, struct nbd_request *request,
} else {
rc = nbd_send_request(s->sock, request);
}
qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, NULL,
nbd_have_request, s);
qemu_aio_set_fd_handler(s->sock, nbd_reply_ready, NULL, s);
s->send_coroutine = NULL;
qemu_co_mutex_unlock(&s->send_mutex);
return rc;
@ -438,8 +429,7 @@ static int nbd_establish_connection(BlockDriverState *bs)
/* Now that we're connected, set the socket to be non-blocking and
* kick the reply mechanism. */
qemu_set_nonblock(sock);
qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL,
nbd_have_request, s);
qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL, s);
s->sock = sock;
s->size = size;
@ -459,7 +449,7 @@ static void nbd_teardown_connection(BlockDriverState *bs)
request.len = 0;
nbd_send_request(s->sock, &request);
qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL, NULL);
qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL);
closesocket(s->sock);
}

16
block/rbd.c
View File

@ -100,7 +100,6 @@ typedef struct BDRVRBDState {
rados_ioctx_t io_ctx;
rbd_image_t image;
char name[RBD_MAX_IMAGE_NAME_SIZE];
int qemu_aio_count;
char *snap;
int event_reader_pos;
RADOSCB *event_rcb;
@ -428,19 +427,11 @@ static void qemu_rbd_aio_event_reader(void *opaque)
if (s->event_reader_pos == sizeof(s->event_rcb)) {
s->event_reader_pos = 0;
qemu_rbd_complete_aio(s->event_rcb);
s->qemu_aio_count--;
}
}
} while (ret < 0 && errno == EINTR);
}
static int qemu_rbd_aio_flush_cb(void *opaque)
{
BDRVRBDState *s = opaque;
return (s->qemu_aio_count > 0);
}
/* TODO Convert to fine grained options */
static QemuOptsList runtime_opts = {
.name = "rbd",
@ -554,7 +545,7 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags)
fcntl(s->fds[0], F_SETFL, O_NONBLOCK);
fcntl(s->fds[1], F_SETFL, O_NONBLOCK);
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], qemu_rbd_aio_event_reader,
NULL, qemu_rbd_aio_flush_cb, s);
NULL, s);
qemu_opts_del(opts);
@ -578,7 +569,7 @@ static void qemu_rbd_close(BlockDriverState *bs)
close(s->fds[0]);
close(s->fds[1]);
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL, NULL, NULL, NULL);
qemu_aio_set_fd_handler(s->fds[RBD_FD_READ], NULL, NULL, NULL);
rbd_close(s->image);
rados_ioctx_destroy(s->io_ctx);
@ -741,8 +732,6 @@ static BlockDriverAIOCB *rbd_start_aio(BlockDriverState *bs,
off = sector_num * BDRV_SECTOR_SIZE;
size = nb_sectors * BDRV_SECTOR_SIZE;
s->qemu_aio_count++; /* All the RADOSCB */
rcb = g_malloc(sizeof(RADOSCB));
rcb->done = 0;
rcb->acb = acb;
@ -779,7 +768,6 @@ static BlockDriverAIOCB *rbd_start_aio(BlockDriverState *bs,
failed:
g_free(rcb);
s->qemu_aio_count--;
qemu_aio_release(acb);
return NULL;
}

33
block/sheepdog.c
View File

@ -509,13 +509,6 @@ static void restart_co_req(void *opaque)
qemu_coroutine_enter(co, NULL);
}
static int have_co_req(void *opaque)
{
/* this handler is set only when there is a pending request, so
* always returns 1. */
return 1;
}
typedef struct SheepdogReqCo {
int sockfd;
SheepdogReq *hdr;
@ -538,14 +531,14 @@ static coroutine_fn void do_co_req(void *opaque)
unsigned int *rlen = srco->rlen;
co = qemu_coroutine_self();
qemu_aio_set_fd_handler(sockfd, NULL, restart_co_req, have_co_req, co);
qemu_aio_set_fd_handler(sockfd, NULL, restart_co_req, co);
ret = send_co_req(sockfd, hdr, data, wlen);
if (ret < 0) {
goto out;
}
qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, have_co_req, co);
qemu_aio_set_fd_handler(sockfd, restart_co_req, NULL, co);
ret = qemu_co_recv(sockfd, hdr, sizeof(*hdr));
if (ret < sizeof(*hdr)) {
@ -570,7 +563,7 @@ static coroutine_fn void do_co_req(void *opaque)
out:
/* there is at most one request for this sockfd, so it is safe to
* set each handler to NULL. */
qemu_aio_set_fd_handler(sockfd, NULL, NULL, NULL, NULL);
qemu_aio_set_fd_handler(sockfd, NULL, NULL, NULL);
srco->ret = ret;
srco->finished = true;
@ -796,14 +789,6 @@ static void co_write_request(void *opaque)
qemu_coroutine_enter(s->co_send, NULL);
}
static int aio_flush_request(void *opaque)
{
BDRVSheepdogState *s = opaque;
return !QLIST_EMPTY(&s->inflight_aio_head) ||
!QLIST_EMPTY(&s->pending_aio_head);
}
/*
* Return a socket discriptor to read/write objects.
*
@ -819,7 +804,7 @@ static int get_sheep_fd(BDRVSheepdogState *s)
return fd;
}
qemu_aio_set_fd_handler(fd, co_read_response, NULL, aio_flush_request, s);
qemu_aio_set_fd_handler(fd, co_read_response, NULL, s);
return fd;
}
@ -1069,8 +1054,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
qemu_co_mutex_lock(&s->lock);
s->co_send = qemu_coroutine_self();
qemu_aio_set_fd_handler(s->fd, co_read_response, co_write_request,
aio_flush_request, s);
qemu_aio_set_fd_handler(s->fd, co_read_response, co_write_request, s);
socket_set_cork(s->fd, 1);
/* send a header */
@ -1091,8 +1075,7 @@ static int coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
}
socket_set_cork(s->fd, 0);
qemu_aio_set_fd_handler(s->fd, co_read_response, NULL,
aio_flush_request, s);
qemu_aio_set_fd_handler(s->fd, co_read_response, NULL, s);
qemu_co_mutex_unlock(&s->lock);
return 0;
@ -1350,7 +1333,7 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags)
g_free(buf);
return 0;
out:
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL);
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL);
if (s->fd >= 0) {
closesocket(s->fd);
}
@ -1578,7 +1561,7 @@ static void sd_close(BlockDriverState *bs)
error_report("%s, %s", sd_strerror(rsp->result), s->name);
}
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL);
qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL);
closesocket(s->fd);
g_free(s->host_spec);
}

12
block/ssh.c
View File

@ -740,14 +740,6 @@ static void restart_coroutine(void *opaque)
qemu_coroutine_enter(co, NULL);
}
/* Always true because when we have called set_fd_handler there is
* always a request being processed.
*/
static int return_true(void *opaque)
{
return 1;
}
static coroutine_fn void set_fd_handler(BDRVSSHState *s)
{
int r;
@ -766,13 +758,13 @@ static coroutine_fn void set_fd_handler(BDRVSSHState *s)
DPRINTF("s->sock=%d rd_handler=%p wr_handler=%p", s->sock,
rd_handler, wr_handler);
qemu_aio_set_fd_handler(s->sock, rd_handler, wr_handler, return_true, co);
qemu_aio_set_fd_handler(s->sock, rd_handler, wr_handler, co);
}
static coroutine_fn void clear_fd_handler(BDRVSSHState *s)
{
DPRINTF("s->sock=%d", s->sock);
qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL, NULL);
qemu_aio_set_fd_handler(s->sock, NULL, NULL, NULL);
}
/* A non-blocking call returned EAGAIN, so yield, ensuring the

6
block/stream.c
View File

@ -57,6 +57,11 @@ static void close_unused_images(BlockDriverState *top, BlockDriverState *base,
BlockDriverState *intermediate;
intermediate = top->backing_hd;
/* Must assign before bdrv_delete() to prevent traversing dangling pointer
* while we delete backing image instances.
*/
top->backing_hd = base;
while (intermediate) {
BlockDriverState *unused;
@ -70,7 +75,6 @@ static void close_unused_images(BlockDriverState *top, BlockDriverState *base,
unused->backing_hd = NULL;
bdrv_delete(unused);
}
top->backing_hd = base;
}
static void coroutine_fn stream_run(void *opaque)

25
hw/block/dataplane/virtio-blk.c
View File

@ -261,11 +261,6 @@ static int process_request(IOQueue *ioq, struct iovec iov[],
}
}
static int flush_true(EventNotifier *e)
{
return true;
}
static void handle_notify(EventNotifier *e)
{
VirtIOBlockDataPlane *s = container_of(e, VirtIOBlockDataPlane,
@ -345,14 +340,6 @@ static void handle_notify(EventNotifier *e)
}
}
static int flush_io(EventNotifier *e)
{
VirtIOBlockDataPlane *s = container_of(e, VirtIOBlockDataPlane,
io_notifier);
return s->num_reqs > 0;
}
static void handle_io(EventNotifier *e)
{
VirtIOBlockDataPlane *s = container_of(e, VirtIOBlockDataPlane,
@ -376,9 +363,9 @@ static void *data_plane_thread(void *opaque)
{
VirtIOBlockDataPlane *s = opaque;
do {
while (!s->stopping || s->num_reqs > 0) {
aio_poll(s->ctx, true);
} while (!s->stopping || s->num_reqs > 0);
}
return NULL;
}
@ -485,7 +472,7 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
exit(1);
}
s->host_notifier = *virtio_queue_get_host_notifier(vq);
aio_set_event_notifier(s->ctx, &s->host_notifier, handle_notify, flush_true);
aio_set_event_notifier(s->ctx, &s->host_notifier, handle_notify);
/* Set up ioqueue */
ioq_init(&s->ioqueue, s->fd, REQ_MAX);
@ -493,7 +480,7 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
ioq_put_iocb(&s->ioqueue, &s->requests[i].iocb);
}
s->io_notifier = *ioq_get_notifier(&s->ioqueue);
aio_set_event_notifier(s->ctx, &s->io_notifier, handle_io, flush_io);
aio_set_event_notifier(s->ctx, &s->io_notifier, handle_io);
s->started = true;
trace_virtio_blk_data_plane_start(s);
@ -525,10 +512,10 @@ void virtio_blk_data_plane_stop(VirtIOBlockDataPlane *s)
qemu_thread_join(&s->thread);
}
aio_set_event_notifier(s->ctx, &s->io_notifier, NULL, NULL);
aio_set_event_notifier(s->ctx, &s->io_notifier, NULL);
ioq_cleanup(&s->ioqueue);
aio_set_event_notifier(s->ctx, &s->host_notifier, NULL, NULL);
aio_set_event_notifier(s->ctx, &s->host_notifier, NULL);
k->set_host_notifier(qbus->parent, 0, false);
aio_context_unref(s->ctx);

14
include/block/aio.h
View File

@ -74,9 +74,6 @@ typedef struct AioContext {
struct ThreadPool *thread_pool;
} AioContext;
/* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
typedef int (AioFlushEventNotifierHandler)(EventNotifier *e);
/**
* aio_context_new: Allocate a new AioContext.
*
@ -198,9 +195,6 @@ bool aio_pending(AioContext *ctx);
bool aio_poll(AioContext *ctx, bool blocking);
#ifdef CONFIG_POSIX
/* Returns 1 if there are still outstanding AIO requests; 0 otherwise */
typedef int (AioFlushHandler)(void *opaque);
/* Register a file descriptor and associated callbacks. Behaves very similarly
* to qemu_set_fd_handler2. Unlike qemu_set_fd_handler2, these callbacks will
* be invoked when using qemu_aio_wait().
@ -212,7 +206,6 @@ void aio_set_fd_handler(AioContext *ctx,
int fd,
IOHandler *io_read,
IOHandler *io_write,
AioFlushHandler *io_flush,
void *opaque);
#endif
@ -225,8 +218,7 @@ void aio_set_fd_handler(AioContext *ctx,
*/
void aio_set_event_notifier(AioContext *ctx,
EventNotifier *notifier,
EventNotifierHandler *io_read,
AioFlushEventNotifierHandler *io_flush);
EventNotifierHandler *io_read);
/* Return a GSource that lets the main loop poll the file descriptors attached
* to this AioContext.
@ -240,14 +232,12 @@ struct ThreadPool *aio_get_thread_pool(AioContext *ctx);
bool qemu_aio_wait(void);
void qemu_aio_set_event_notifier(EventNotifier *notifier,
EventNotifierHandler *io_read,
AioFlushEventNotifierHandler *io_flush);
EventNotifierHandler *io_read);
#ifdef CONFIG_POSIX
void qemu_aio_set_fd_handler(int fd,
IOHandler *io_read,
IOHandler *io_write,
AioFlushHandler *io_flush,
void *opaque);
#endif

9
main-loop.c
View File

@ -489,17 +489,14 @@ bool qemu_aio_wait(void)
void qemu_aio_set_fd_handler(int fd,
IOHandler *io_read,
IOHandler *io_write,
AioFlushHandler *io_flush,
void *opaque)
{
aio_set_fd_handler(qemu_aio_context, fd, io_read, io_write, io_flush,
opaque);
aio_set_fd_handler(qemu_aio_context, fd, io_read, io_write, opaque);
}
#endif
void qemu_aio_set_event_notifier(EventNotifier *notifier,
EventNotifierHandler *io_read,
AioFlushEventNotifierHandler *io_flush)
EventNotifierHandler *io_read)
{
aio_set_event_notifier(qemu_aio_context, notifier, io_read, io_flush);
aio_set_event_notifier(qemu_aio_context, notifier, io_read);
}

82
tests/test-aio.c
View File

@ -15,6 +15,13 @@
AioContext *ctx;
typedef struct {
EventNotifier e;
int n;
int active;
bool auto_set;
} EventNotifierTestData;
/* Wait until there are no more BHs or AIO requests */
static void wait_for_aio(void)
{
@ -23,6 +30,14 @@ static void wait_for_aio(void)
}
}
/* Wait until event notifier becomes inactive */
static void wait_until_inactive(EventNotifierTestData *data)
{
while (data->active > 0) {
aio_poll(ctx, true);
}
}
/* Simple callbacks for testing. */
typedef struct {
@ -50,19 +65,6 @@ static void bh_delete_cb(void *opaque)
}
}
typedef struct {
EventNotifier e;
int n;
int active;
bool auto_set;
} EventNotifierTestData;
static int event_active_cb(EventNotifier *e)
{
EventNotifierTestData *data = container_of(e, EventNotifierTestData, e);
return data->active > 0;
}
static void event_ready_cb(EventNotifier *e)
{
EventNotifierTestData *data = container_of(e, EventNotifierTestData, e);
@ -231,11 +233,11 @@ static void test_set_event_notifier(void)
{
EventNotifierTestData data = { .n = 0, .active = 0 };
event_notifier_init(&data.e, false);
aio_set_event_notifier(ctx, &data.e, event_ready_cb, event_active_cb);
aio_set_event_notifier(ctx, &data.e, event_ready_cb);
g_assert(!aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 0);
aio_set_event_notifier(ctx, &data.e, NULL, NULL);
aio_set_event_notifier(ctx, &data.e, NULL);
g_assert(!aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 0);
event_notifier_cleanup(&data.e);
@ -245,8 +247,8 @@ static void test_wait_event_notifier(void)
{
EventNotifierTestData data = { .n = 0, .active = 1 };
event_notifier_init(&data.e, false);
aio_set_event_notifier(ctx, &data.e, event_ready_cb, event_active_cb);
g_assert(aio_poll(ctx, false));
aio_set_event_notifier(ctx, &data.e, event_ready_cb);
g_assert(!aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 0);
g_assert_cmpint(data.active, ==, 1);
@ -259,7 +261,7 @@ static void test_wait_event_notifier(void)
g_assert_cmpint(data.n, ==, 1);
g_assert_cmpint(data.active, ==, 0);
aio_set_event_notifier(ctx, &data.e, NULL, NULL);
aio_set_event_notifier(ctx, &data.e, NULL);
g_assert(!aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 1);
@ -270,8 +272,8 @@ static void test_flush_event_notifier(void)
{
EventNotifierTestData data = { .n = 0, .active = 10, .auto_set = true };
event_notifier_init(&data.e, false);
aio_set_event_notifier(ctx, &data.e, event_ready_cb, event_active_cb);
g_assert(aio_poll(ctx, false));
aio_set_event_notifier(ctx, &data.e, event_ready_cb);
g_assert(!aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 0);
g_assert_cmpint(data.active, ==, 10);
@ -281,12 +283,12 @@ static void test_flush_event_notifier(void)
g_assert_cmpint(data.active, ==, 9);
g_assert(aio_poll(ctx, false));
wait_for_aio();
wait_until_inactive(&data);
g_assert_cmpint(data.n, ==, 10);
g_assert_cmpint(data.active, ==, 0);
g_assert(!aio_poll(ctx, false));
aio_set_event_notifier(ctx, &data.e, NULL, NULL);
aio_set_event_notifier(ctx, &data.e, NULL);
g_assert(!aio_poll(ctx, false));
event_notifier_cleanup(&data.e);
}
@ -297,7 +299,7 @@ static void test_wait_event_notifier_noflush(void)
EventNotifierTestData dummy = { .n = 0, .active = 1 };
event_notifier_init(&data.e, false);
aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
aio_set_event_notifier(ctx, &data.e, event_ready_cb);
g_assert(!aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 0);
@ -305,35 +307,35 @@ static void test_wait_event_notifier_noflush(void)
/* Until there is an active descriptor, aio_poll may or may not call
* event_ready_cb. Still, it must not block. */
event_notifier_set(&data.e);
g_assert(!aio_poll(ctx, true));
g_assert(aio_poll(ctx, true));
data.n = 0;
/* An active event notifier forces aio_poll to look at EventNotifiers. */
event_notifier_init(&dummy.e, false);
aio_set_event_notifier(ctx, &dummy.e, event_ready_cb, event_active_cb);
aio_set_event_notifier(ctx, &dummy.e, event_ready_cb);
event_notifier_set(&data.e);
g_assert(aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 1);
g_assert(aio_poll(ctx, false));
g_assert(!aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 1);
event_notifier_set(&data.e);
g_assert(aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 2);
g_assert(aio_poll(ctx, false));
g_assert(!aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 2);
event_notifier_set(&dummy.e);
wait_for_aio();
wait_until_inactive(&dummy);
g_assert_cmpint(data.n, ==, 2);
g_assert_cmpint(dummy.n, ==, 1);
g_assert_cmpint(dummy.active, ==, 0);
aio_set_event_notifier(ctx, &dummy.e, NULL, NULL);
aio_set_event_notifier(ctx, &dummy.e, NULL);
event_notifier_cleanup(&dummy.e);
aio_set_event_notifier(ctx, &data.e, NULL, NULL);
aio_set_event_notifier(ctx, &data.e, NULL);
g_assert(!aio_poll(ctx, false));
g_assert_cmpint(data.n, ==, 2);
@ -513,11 +515,11 @@ static void test_source_set_event_notifier(void)
{
EventNotifierTestData data = { .n = 0, .active = 0 };
event_notifier_init(&data.e, false);
aio_set_event_notifier(ctx, &data.e, event_ready_cb, event_active_cb);
aio_set_event_notifier(ctx, &data.e, event_ready_cb);
while (g_main_context_iteration(NULL, false));
g_assert_cmpint(data.n, ==, 0);
aio_set_event_notifier(ctx, &data.e, NULL, NULL);
aio_set_event_notifier(ctx, &data.e, NULL);
while (g_main_context_iteration(NULL, false));
g_assert_cmpint(data.n, ==, 0);
event_notifier_cleanup(&data.e);
@ -527,7 +529,7 @@ static void test_source_wait_event_notifier(void)
{
EventNotifierTestData data = { .n = 0, .active = 1 };
event_notifier_init(&data.e, false);
aio_set_event_notifier(ctx, &data.e, event_ready_cb, event_active_cb);
aio_set_event_notifier(ctx, &data.e, event_ready_cb);
g_assert(g_main_context_iteration(NULL, false));
g_assert_cmpint(data.n, ==, 0);
g_assert_cmpint(data.active, ==, 1);
@ -541,7 +543,7 @@ static void test_source_wait_event_notifier(void)
g_assert_cmpint(data.n, ==, 1);
g_assert_cmpint(data.active, ==, 0);
aio_set_event_notifier(ctx, &data.e, NULL, NULL);
aio_set_event_notifier(ctx, &data.e, NULL);
while (g_main_context_iteration(NULL, false));
g_assert_cmpint(data.n, ==, 1);
@ -552,7 +554,7 @@ static void test_source_flush_event_notifier(void)
{
EventNotifierTestData data = { .n = 0, .active = 10, .auto_set = true };
event_notifier_init(&data.e, false);
aio_set_event_notifier(ctx, &data.e, event_ready_cb, event_active_cb);
aio_set_event_notifier(ctx, &data.e, event_ready_cb);
g_assert(g_main_context_iteration(NULL, false));
g_assert_cmpint(data.n, ==, 0);
g_assert_cmpint(data.active, ==, 10);
@ -568,7 +570,7 @@ static void test_source_flush_event_notifier(void)
g_assert_cmpint(data.active, ==, 0);
g_assert(!g_main_context_iteration(NULL, false));
aio_set_event_notifier(ctx, &data.e, NULL, NULL);
aio_set_event_notifier(ctx, &data.e, NULL);
while (g_main_context_iteration(NULL, false));
event_notifier_cleanup(&data.e);
}
@ -579,7 +581,7 @@ static void test_source_wait_event_notifier_noflush(void)
EventNotifierTestData dummy = { .n = 0, .active = 1 };
event_notifier_init(&data.e, false);
aio_set_event_notifier(ctx, &data.e, event_ready_cb, NULL);
aio_set_event_notifier(ctx, &data.e, event_ready_cb);
while (g_main_context_iteration(NULL, false));
g_assert_cmpint(data.n, ==, 0);
@ -592,7 +594,7 @@ static void test_source_wait_event_notifier_noflush(void)
/* An active event notifier forces aio_poll to look at EventNotifiers. */
event_notifier_init(&dummy.e, false);
aio_set_event_notifier(ctx, &dummy.e, event_ready_cb, event_active_cb);
aio_set_event_notifier(ctx, &dummy.e, event_ready_cb);
event_notifier_set(&data.e);
g_assert(g_main_context_iteration(NULL, false));
@ -612,10 +614,10 @@ static void test_source_wait_event_notifier_noflush(void)
g_assert_cmpint(dummy.n, ==, 1);
g_assert_cmpint(dummy.active, ==, 0);
aio_set_event_notifier(ctx, &dummy.e, NULL, NULL);
aio_set_event_notifier(ctx, &dummy.e, NULL);
event_notifier_cleanup(&dummy.e);
aio_set_event_notifier(ctx, &data.e, NULL, NULL);
aio_set_event_notifier(ctx, &data.e, NULL);
while (g_main_context_iteration(NULL, false));
g_assert_cmpint(data.n, ==, 2);

24
tests/test-thread-pool.c
View File

@ -40,19 +40,13 @@ static void done_cb(void *opaque, int ret)
active--;
}
/* Wait until all aio and bh activity has finished */
static void qemu_aio_wait_all(void)
{
while (aio_poll(ctx, true)) {
/* Do nothing */
}
}
static void test_submit(void)
{
WorkerTestData data = { .n = 0 };
thread_pool_submit(pool, worker_cb, &data);
qemu_aio_wait_all();
while (data.n == 0) {
aio_poll(ctx, true);
}
g_assert_cmpint(data.n, ==, 1);
}
@ -65,7 +59,9 @@ static void test_submit_aio(void)
/* The callbacks are not called until after the first wait. */
active = 1;
g_assert_cmpint(data.ret, ==, -EINPROGRESS);
qemu_aio_wait_all();
while (data.ret == -EINPROGRESS) {
aio_poll(ctx, true);
}
g_assert_cmpint(active, ==, 0);
g_assert_cmpint(data.n, ==, 1);
g_assert_cmpint(data.ret, ==, 0);
@ -103,7 +99,9 @@ static void test_submit_co(void)
/* qemu_aio_wait_all will execute the rest of the coroutine. */
qemu_aio_wait_all();
while (data.ret == -EINPROGRESS) {
aio_poll(ctx, true);
}
/* Back here after the coroutine has finished. */
@ -187,7 +185,9 @@ static void test_cancel(void)
}
/* Finish execution and execute any remaining callbacks. */
qemu_aio_wait_all();
while (active > 0) {
aio_poll(ctx, true);
}
g_assert_cmpint(active, ==, 0);
for (i = 0; i < 100; i++) {
if (data[i].n == 3) {

11
thread-pool.c
View File

@ -197,12 +197,6 @@ restart:
}
}
static int thread_pool_active(EventNotifier *notifier)
{
ThreadPool *pool = container_of(notifier, ThreadPool, notifier);
return !QLIST_EMPTY(&pool->head);
}
static void thread_pool_cancel(BlockDriverAIOCB *acb)
{
ThreadPoolElement *elem = (ThreadPoolElement *)acb;
@ -309,8 +303,7 @@ static void thread_pool_init_one(ThreadPool *pool, AioContext *ctx)
QLIST_INIT(&pool->head);
QTAILQ_INIT(&pool->request_list);
aio_set_event_notifier(ctx, &pool->notifier, event_notifier_ready,
thread_pool_active);
aio_set_event_notifier(ctx, &pool->notifier, event_notifier_ready);
}
ThreadPool *thread_pool_new(AioContext *ctx)
@ -344,7 +337,7 @@ void thread_pool_free(ThreadPool *pool)
qemu_mutex_unlock(&pool->lock);
aio_set_event_notifier(pool->ctx, &pool->notifier, NULL, NULL);
aio_set_event_notifier(pool->ctx, &pool->notifier, NULL);
qemu_sem_destroy(&pool->sem);
qemu_cond_destroy(&pool->check_cancel);
qemu_cond_destroy(&pool->worker_stopped);