#include "qapi-event.h"
void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
- int64_t speed, BlockDriverCompletionFunc *cb,
+ int64_t speed, BlockCompletionFunc *cb,
void *opaque, Error **errp)
{
BlockJob *job;
error_setg(&job->blocker, "block device is in use by block job: %s",
BlockJobType_lookup[driver->job_type]);
bdrv_op_block_all(bs, job->blocker);
+ bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
job->driver = driver;
job->bs = bs;
void block_job_complete(BlockJob *job, Error **errp)
{
- if (job->paused || job->cancelled || !job->driver->complete) {
- error_set(errp, QERR_BLOCK_JOB_NOT_READY, job->bs->device_name);
+ if (job->pause_count || job->cancelled || !job->driver->complete) {
+ error_set(errp, QERR_BLOCK_JOB_NOT_READY,
+ bdrv_get_device_name(job->bs));
return;
}
void block_job_pause(BlockJob *job)
{
- job->paused = true;
+ job->pause_count++;
}
bool block_job_is_paused(BlockJob *job)
{
- return job->paused;
+ return job->pause_count > 0;
}
void block_job_resume(BlockJob *job)
{
- job->paused = false;
+ assert(job->pause_count > 0);
+ job->pause_count--;
+ if (job->pause_count) {
+ return;
+ }
+ block_job_enter(job);
+}
+
+void block_job_enter(BlockJob *job)
+{
block_job_iostatus_reset(job);
if (job->co && !job->busy) {
qemu_coroutine_enter(job->co, NULL);
void block_job_cancel(BlockJob *job)
{
job->cancelled = true;
- block_job_resume(job);
+ block_job_enter(job);
}
bool block_job_is_cancelled(BlockJob *job)
}
}
-struct BlockCancelData {
+struct BlockFinishData {
BlockJob *job;
- BlockDriverCompletionFunc *cb;
+ BlockCompletionFunc *cb;
void *opaque;
bool cancelled;
int ret;
};
-static void block_job_cancel_cb(void *opaque, int ret)
+static void block_job_finish_cb(void *opaque, int ret)
{
- struct BlockCancelData *data = opaque;
+ struct BlockFinishData *data = opaque;
data->cancelled = block_job_is_cancelled(data->job);
data->ret = ret;
data->cb(data->opaque, ret);
}
-int block_job_cancel_sync(BlockJob *job)
+static int block_job_finish_sync(BlockJob *job,
+ void (*finish)(BlockJob *, Error **errp),
+ Error **errp)
{
- struct BlockCancelData data;
+ struct BlockFinishData data;
BlockDriverState *bs = job->bs;
+ Error *local_err = NULL;
assert(bs->job == job);
data.cb = job->cb;
data.opaque = job->opaque;
data.ret = -EINPROGRESS;
- job->cb = block_job_cancel_cb;
+ job->cb = block_job_finish_cb;
job->opaque = &data;
- block_job_cancel(job);
+ finish(job, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return -EBUSY;
+ }
while (data.ret == -EINPROGRESS) {
- qemu_aio_wait();
+ aio_poll(bdrv_get_aio_context(bs), true);
}
return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
}
+/* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
+ * used with block_job_finish_sync() without the need for (rather nasty)
+ * function pointer casts there. */
+static void block_job_cancel_err(BlockJob *job, Error **errp)
+{
+ block_job_cancel(job);
+}
+
+int block_job_cancel_sync(BlockJob *job)
+{
+ return block_job_finish_sync(job, &block_job_cancel_err, NULL);
+}
+
+int block_job_complete_sync(BlockJob *job, Error **errp)
+{
+ return block_job_finish_sync(job, &block_job_complete, errp);
+}
+
void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
{
assert(job->busy);
if (block_job_is_paused(job)) {
qemu_coroutine_yield();
} else {
- co_sleep_ns(type, ns);
+ co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
}
job->busy = true;
}
+void block_job_yield(BlockJob *job)
+{
+ assert(job->busy);
+
+ /* Check cancellation *before* setting busy = false, too! */
+ if (block_job_is_cancelled(job)) {
+ return;
+ }
+
+ job->busy = false;
+ qemu_coroutine_yield();
+ job->busy = true;
+}
+
BlockJobInfo *block_job_query(BlockJob *job)
{
BlockJobInfo *info = g_new0(BlockJobInfo, 1);
info->device = g_strdup(bdrv_get_device_name(job->bs));
info->len = job->len;
info->busy = job->busy;
- info->paused = job->paused;
+ info->paused = job->pause_count > 0;
info->offset = job->offset;
info->speed = job->speed;
info->io_status = job->iostatus;
+ info->ready = job->ready;
return info;
}
void block_job_event_ready(BlockJob *job)
{
- qapi_event_send_block_job_ready(bdrv_get_device_name(job->bs), &error_abort);
+ job->ready = true;
+
+ qapi_event_send_block_job_ready(job->driver->job_type,
+ bdrv_get_device_name(job->bs),
+ job->len,
+ job->offset,
+ job->speed, &error_abort);
}
BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs,
default:
abort();
}
- qapi_event_send_block_job_error(bdrv_get_device_name(bs),
+ qapi_event_send_block_job_error(bdrv_get_device_name(job->bs),
is_read ? IO_OPERATION_TYPE_READ :
IO_OPERATION_TYPE_WRITE,
action, &error_abort);
if (action == BLOCK_ERROR_ACTION_STOP) {
+ /* make the pause user visible, which will be resumed from QMP. */
+ job->user_paused = true;
block_job_pause(job);
block_job_iostatus_set_err(job, error);
if (bs != job->bs) {
}
return action;
}
+
+typedef struct {
+ BlockJob *job;
+ QEMUBH *bh;
+ AioContext *aio_context;
+ BlockJobDeferToMainLoopFn *fn;
+ void *opaque;
+} BlockJobDeferToMainLoopData;
+
+static void block_job_defer_to_main_loop_bh(void *opaque)
+{
+ BlockJobDeferToMainLoopData *data = opaque;
+ AioContext *aio_context;
+
+ qemu_bh_delete(data->bh);
+
+ /* Prevent race with block_job_defer_to_main_loop() */
+ aio_context_acquire(data->aio_context);
+
+ /* Fetch BDS AioContext again, in case it has changed */
+ aio_context = bdrv_get_aio_context(data->job->bs);
+ aio_context_acquire(aio_context);
+
+ data->fn(data->job, data->opaque);
+
+ aio_context_release(aio_context);
+
+ aio_context_release(data->aio_context);
+
+ g_free(data);
+}
+
+void block_job_defer_to_main_loop(BlockJob *job,
+ BlockJobDeferToMainLoopFn *fn,
+ void *opaque)
+{
+ BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data));
+ data->job = job;
+ data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data);
+ data->aio_context = bdrv_get_aio_context(job->bs);
+ data->fn = fn;
+ data->opaque = opaque;
+
+ qemu_bh_schedule(data->bh);
+}
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