#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qjson.h"
#include "qemu/coroutine.h"
+#include "qemu/id.h"
#include "qmp-commands.h"
#include "qemu/timer.h"
#include "qapi-event.h"
return QLIST_NEXT(job, job_list);
}
-void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
- int64_t speed, BlockCompletionFunc *cb,
- void *opaque, Error **errp)
+BlockJob *block_job_get(const char *id)
+{
+ BlockJob *job;
+
+ QLIST_FOREACH(job, &block_jobs, job_list) {
+ if (!strcmp(id, job->id)) {
+ return job;
+ }
+ }
+
+ return NULL;
+}
+
+/* Normally the job runs in its BlockBackend's AioContext. The exception is
+ * block_job_defer_to_main_loop() where it runs in the QEMU main loop. Code
+ * that supports both cases uses this helper function.
+ */
+static AioContext *block_job_get_aio_context(BlockJob *job)
+{
+ return job->deferred_to_main_loop ?
+ qemu_get_aio_context() :
+ blk_get_aio_context(job->blk);
+}
+
+static void block_job_attached_aio_context(AioContext *new_context,
+ void *opaque)
+{
+ BlockJob *job = opaque;
+
+ if (job->driver->attached_aio_context) {
+ job->driver->attached_aio_context(job, new_context);
+ }
+
+ block_job_resume(job);
+}
+
+static void block_job_detach_aio_context(void *opaque)
+{
+ BlockJob *job = opaque;
+
+ /* In case the job terminates during aio_poll()... */
+ block_job_ref(job);
+
+ block_job_pause(job);
+
+ if (!job->paused) {
+ /* If job is !job->busy this kicks it into the next pause point. */
+ block_job_enter(job);
+ }
+ while (!job->paused && !job->completed) {
+ aio_poll(block_job_get_aio_context(job), true);
+ }
+
+ block_job_unref(job);
+}
+
+void *block_job_create(const char *job_id, const BlockJobDriver *driver,
+ BlockDriverState *bs, int64_t speed,
+ BlockCompletionFunc *cb, void *opaque, Error **errp)
{
BlockBackend *blk;
BlockJob *job;
+ assert(cb);
if (bs->job) {
error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
return NULL;
}
+ if (job_id == NULL) {
+ job_id = bdrv_get_device_name(bs);
+ if (!*job_id) {
+ error_setg(errp, "An explicit job ID is required for this node");
+ return NULL;
+ }
+ }
+
+ if (!id_wellformed(job_id)) {
+ error_setg(errp, "Invalid job ID '%s'", job_id);
+ return NULL;
+ }
+
+ if (block_job_get(job_id)) {
+ error_setg(errp, "Job ID '%s' already in use", job_id);
+ return NULL;
+ }
+
blk = blk_new();
blk_insert_bs(blk, bs);
bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
job->driver = driver;
- job->id = g_strdup(bdrv_get_device_name(bs));
+ job->id = g_strdup(job_id);
job->blk = blk;
job->cb = cb;
job->opaque = opaque;
QLIST_INSERT_HEAD(&block_jobs, job, job_list);
+ blk_add_aio_context_notifier(blk, block_job_attached_aio_context,
+ block_job_detach_aio_context, job);
+
/* Only set speed when necessary to avoid NotSupported error */
if (speed != 0) {
Error *local_err = NULL;
BlockDriverState *bs = blk_bs(job->blk);
bs->job = NULL;
bdrv_op_unblock_all(bs, job->blocker);
+ blk_remove_aio_context_notifier(job->blk,
+ block_job_attached_aio_context,
+ block_job_detach_aio_context, job);
blk_unref(job->blk);
error_free(job->blocker);
g_free(job->id);
void block_job_complete(BlockJob *job, Error **errp)
{
if (job->pause_count || job->cancelled || !job->driver->complete) {
- error_setg(errp, QERR_BLOCK_JOB_NOT_READY, job->id);
+ error_setg(errp, "The active block job '%s' cannot be completed",
+ job->id);
return;
}
job->pause_count++;
}
-bool block_job_is_paused(BlockJob *job)
+static bool block_job_should_pause(BlockJob *job)
{
return job->pause_count > 0;
}
+void coroutine_fn block_job_pause_point(BlockJob *job)
+{
+ if (!block_job_should_pause(job)) {
+ return;
+ }
+ if (block_job_is_cancelled(job)) {
+ return;
+ }
+
+ if (job->driver->pause) {
+ job->driver->pause(job);
+ }
+
+ if (block_job_should_pause(job) && !block_job_is_cancelled(job)) {
+ job->paused = true;
+ job->busy = false;
+ qemu_coroutine_yield(); /* wait for block_job_resume() */
+ job->busy = true;
+ job->paused = false;
+ }
+
+ if (job->driver->resume) {
+ job->driver->resume(job);
+ }
+}
+
void block_job_resume(BlockJob *job)
{
assert(job->pause_count > 0);
void block_job_enter(BlockJob *job)
{
- block_job_iostatus_reset(job);
if (job->co && !job->busy) {
- qemu_coroutine_enter(job->co, NULL);
+ qemu_coroutine_enter(job->co);
}
}
void block_job_cancel(BlockJob *job)
{
job->cancelled = true;
+ block_job_iostatus_reset(job);
block_job_enter(job);
}
return -EBUSY;
}
while (!job->completed) {
- aio_poll(job->deferred_to_main_loop ? qemu_get_aio_context() :
- blk_get_aio_context(job->blk),
- true);
+ aio_poll(block_job_get_aio_context(job), true);
}
ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
block_job_unref(job);
}
job->busy = false;
- if (!block_job_is_paused(job)) {
+ if (!block_job_should_pause(job)) {
co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns);
}
- /* The job can be paused while sleeping, so check this again */
- if (block_job_is_paused(job)) {
- qemu_coroutine_yield();
- }
job->busy = true;
+
+ block_job_pause_point(job);
}
void block_job_yield(BlockJob *job)
}
job->busy = false;
- qemu_coroutine_yield();
+ if (!block_job_should_pause(job)) {
+ qemu_coroutine_yield();
+ }
job->busy = true;
+
+ block_job_pause_point(job);
}
BlockJobInfo *block_job_query(BlockJob *job)
switch (on_err) {
case BLOCKDEV_ON_ERROR_ENOSPC:
+ case BLOCKDEV_ON_ERROR_AUTO:
action = (error == ENOSPC) ?
BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
break;
typedef struct {
BlockJob *job;
- QEMUBH *bh;
AioContext *aio_context;
BlockJobDeferToMainLoopFn *fn;
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);
{
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 = blk_get_aio_context(job->blk);
data->fn = fn;
data->opaque = opaque;
job->deferred_to_main_loop = true;
- qemu_bh_schedule(data->bh);
+ aio_bh_schedule_oneshot(qemu_get_aio_context(),
+ block_job_defer_to_main_loop_bh, data);
}
BlockJobTxn *block_job_txn_new(void)
projects / qemu.git / blobdiff