#include "qemu-common.h"
#include "trace.h"
#include "block/block.h"
-#include "block/blockjob.h"
+#include "block/blockjob_int.h"
#include "block/block_int.h"
#include "sysemu/block-backend.h"
#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"
+static void block_job_event_cancelled(BlockJob *job);
+static void block_job_event_completed(BlockJob *job, const char *msg);
+
/* Transactional group of block jobs */
struct BlockJobTxn {
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 (job->id && !strcmp(id, job->id)) {
+ return job;
+ }
+ }
+
+ return NULL;
+}
+
+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_drain(BlockJob *job)
+{
+ /* If job is !job->busy this kicks it into the next pause point. */
+ block_job_enter(job);
+
+ blk_drain(job->blk);
+ if (job->driver->drain) {
+ job->driver->drain(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);
+
+ while (!job->paused && !job->completed) {
+ block_job_drain(job);
+ }
+
+ block_job_unref(job);
+}
+
+void block_job_add_bdrv(BlockJob *job, BlockDriverState *bs)
+{
+ job->nodes = g_slist_prepend(job->nodes, bs);
+ bdrv_ref(bs);
+ bdrv_op_block_all(bs, job->blocker);
+}
+
+void *block_job_create(const char *job_id, const BlockJobDriver *driver,
+ BlockDriverState *bs, int64_t speed, int flags,
+ BlockCompletionFunc *cb, void *opaque, Error **errp)
{
BlockBackend *blk;
BlockJob *job;
return NULL;
}
+ if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) {
+ 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 (job_id) {
+ if (flags & BLOCK_JOB_INTERNAL) {
+ error_setg(errp, "Cannot specify job ID for internal block job");
+ 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);
job = g_malloc0(driver->instance_size);
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);
+ block_job_add_bdrv(job, 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;
return job;
}
+bool block_job_is_internal(BlockJob *job)
+{
+ return (job->id == NULL);
+}
+
void block_job_ref(BlockJob *job)
{
++job->refcnt;
void block_job_unref(BlockJob *job)
{
if (--job->refcnt == 0) {
+ GSList *l;
BlockDriverState *bs = blk_bs(job->blk);
bs->job = NULL;
- bdrv_op_unblock_all(bs, job->blocker);
+ for (l = job->nodes; l; l = l->next) {
+ bs = l->data;
+ bdrv_op_unblock_all(bs, job->blocker);
+ bdrv_unref(bs);
+ }
+ g_slist_free(job->nodes);
+ 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);
job->driver->abort(job);
}
}
- job->cb(job->opaque, job->ret);
+
+ if (job->cb) {
+ job->cb(job->opaque, job->ret);
+ }
+ if (block_job_is_cancelled(job)) {
+ block_job_event_cancelled(job);
+ } else {
+ const char *msg = NULL;
+ if (job->ret < 0) {
+ msg = strerror(-job->ret);
+ }
+ block_job_event_completed(job, msg);
+ }
+
if (job->txn) {
block_job_txn_unref(job->txn);
}
void block_job_complete(BlockJob *job, Error **errp)
{
+ /* Should not be reachable via external interface for internal jobs */
+ assert(job->id);
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)
+void block_job_user_pause(BlockJob *job)
+{
+ job->user_paused = true;
+ block_job_pause(job);
+}
+
+static bool block_job_should_pause(BlockJob *job)
{
return job->pause_count > 0;
}
+bool block_job_user_paused(BlockJob *job)
+{
+ return job ? job->user_paused : 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);
block_job_enter(job);
}
+void block_job_user_resume(BlockJob *job)
+{
+ if (job && job->user_paused && job->pause_count > 0) {
+ job->user_paused = false;
+ block_job_resume(job);
+ }
+}
+
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);
}
assert(blk_bs(job->blk)->job == job);
block_job_ref(job);
+
finish(job, &local_err);
if (local_err) {
error_propagate(errp, local_err);
block_job_unref(job);
return -EBUSY;
}
+ /* block_job_drain calls block_job_enter, and it should be enough to
+ * induce progress until the job completes or moves to the main thread.
+ */
+ while (!job->deferred_to_main_loop && !job->completed) {
+ block_job_drain(job);
+ }
while (!job->completed) {
- aio_poll(job->deferred_to_main_loop ? qemu_get_aio_context() :
- blk_get_aio_context(job->blk),
- true);
+ aio_poll(qemu_get_aio_context(), true);
}
ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
block_job_unref(job);
}
job->busy = false;
- if (block_job_is_paused(job)) {
- qemu_coroutine_yield();
- } else {
+ if (!block_job_should_pause(job)) {
co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns);
}
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)
+BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
{
- BlockJobInfo *info = g_new0(BlockJobInfo, 1);
+ BlockJobInfo *info;
+
+ if (block_job_is_internal(job)) {
+ error_setg(errp, "Cannot query QEMU internal jobs");
+ return NULL;
+ }
+ info = g_new0(BlockJobInfo, 1);
info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]);
info->device = g_strdup(job->id);
info->len = job->len;
}
}
-void block_job_event_cancelled(BlockJob *job)
+static void block_job_event_cancelled(BlockJob *job)
{
+ if (block_job_is_internal(job)) {
+ return;
+ }
+
qapi_event_send_block_job_cancelled(job->driver->job_type,
job->id,
job->len,
&error_abort);
}
-void block_job_event_completed(BlockJob *job, const char *msg)
+static void block_job_event_completed(BlockJob *job, const char *msg)
{
+ if (block_job_is_internal(job)) {
+ return;
+ }
+
qapi_event_send_block_job_completed(job->driver->job_type,
job->id,
job->len,
{
job->ready = true;
+ if (block_job_is_internal(job)) {
+ return;
+ }
+
qapi_event_send_block_job_ready(job->driver->job_type,
job->id,
job->len,
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;
default:
abort();
}
- qapi_event_send_block_job_error(job->id,
- is_read ? IO_OPERATION_TYPE_READ :
- IO_OPERATION_TYPE_WRITE,
- action, &error_abort);
+ if (!block_job_is_internal(job)) {
+ qapi_event_send_block_job_error(job->id,
+ 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_user_pause(job);
block_job_iostatus_set_err(job, error);
}
return action;
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