#include "qemu/coroutine.h"
#include "qemu/timer.h"
-/* Transactional group of block jobs */
-struct BlockJobTxn {
-
- /* Is this txn being cancelled? */
- bool aborting;
-
- /* List of jobs */
- QLIST_HEAD(, BlockJob) jobs;
-
- /* Reference count */
- int refcnt;
-};
-
/*
* The block job API is composed of two categories of functions.
*
}
}
-BlockJobTxn *block_job_txn_new(void)
-{
- BlockJobTxn *txn = g_new0(BlockJobTxn, 1);
- QLIST_INIT(&txn->jobs);
- txn->refcnt = 1;
- return txn;
-}
-
-static void block_job_txn_ref(BlockJobTxn *txn)
-{
- txn->refcnt++;
-}
-
-void block_job_txn_unref(BlockJobTxn *txn)
-{
- if (txn && --txn->refcnt == 0) {
- g_free(txn);
- }
-}
-
-void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job)
-{
- if (!txn) {
- return;
- }
-
- assert(!job->txn);
- job->txn = txn;
-
- QLIST_INSERT_HEAD(&txn->jobs, job, txn_list);
- block_job_txn_ref(txn);
-}
-
-void block_job_txn_del_job(BlockJob *job)
-{
- if (job->txn) {
- QLIST_REMOVE(job, txn_list);
- block_job_txn_unref(job->txn);
- job->txn = NULL;
- }
-}
-
static void block_job_attached_aio_context(AioContext *new_context,
void *opaque);
static void block_job_detach_aio_context(void *opaque);
BlockJob *bjob = container_of(job, BlockJob, job);
BlockDriverState *bs = blk_bs(bjob->blk);
- assert(!bjob->txn);
-
bs->job = NULL;
block_job_remove_all_bdrv(bjob);
blk_remove_aio_context_notifier(bjob->blk,
void *opaque)
{
BlockJob *job = opaque;
+ const JobDriver *drv = job->job.driver;
+ BlockJobDriver *bjdrv = container_of(drv, BlockJobDriver, job_driver);
job->job.aio_context = new_context;
- if (job->driver->attached_aio_context) {
- job->driver->attached_aio_context(job, new_context);
+ if (bjdrv->attached_aio_context) {
+ bjdrv->attached_aio_context(job, new_context);
}
job_resume(&job->job);
}
-static void block_job_drain(BlockJob *job)
+void block_job_drain(Job *job)
{
- /* If job is !job->job.busy this kicks it into the next pause point. */
- block_job_enter(job);
+ BlockJob *bjob = container_of(job, BlockJob, job);
+ const JobDriver *drv = job->driver;
+ BlockJobDriver *bjdrv = container_of(drv, BlockJobDriver, job_driver);
- blk_drain(job->blk);
- if (job->driver->drain) {
- job->driver->drain(job);
+ blk_drain(bjob->blk);
+ if (bjdrv->drain) {
+ bjdrv->drain(bjob);
}
}
job_pause(&job->job);
while (!job->job.paused && !job_is_completed(&job->job)) {
- block_job_drain(job);
+ job_drain(&job->job);
}
job->job.aio_context = NULL;
job_pause(&job->job);
}
+static bool child_job_drained_poll(BdrvChild *c)
+{
+ BlockJob *bjob = c->opaque;
+ Job *job = &bjob->job;
+ const BlockJobDriver *drv = block_job_driver(bjob);
+
+ /* An inactive or completed job doesn't have any pending requests. Jobs
+ * with !job->busy are either already paused or have a pause point after
+ * being reentered, so no job driver code will run before they pause. */
+ if (!job->busy || job_is_completed(job)) {
+ return false;
+ }
+
+ /* Otherwise, assume that it isn't fully stopped yet, but allow the job to
+ * override this assumption. */
+ if (drv->drained_poll) {
+ return drv->drained_poll(bjob);
+ } else {
+ return true;
+ }
+}
+
static void child_job_drained_end(BdrvChild *c)
{
BlockJob *job = c->opaque;
static const BdrvChildRole child_job = {
.get_parent_desc = child_job_get_parent_desc,
.drained_begin = child_job_drained_begin,
+ .drained_poll = child_job_drained_poll,
.drained_end = child_job_drained_end,
.stay_at_node = true,
};
return 0;
}
-bool block_job_is_internal(BlockJob *job)
+static void block_job_on_idle(Notifier *n, void *opaque)
{
- return (job->job.id == NULL);
-}
-
-const BlockJobDriver *block_job_driver(BlockJob *job)
-{
- return job->driver;
-}
-
-static int block_job_prepare(BlockJob *job)
-{
- if (job->job.ret == 0 && job->driver->prepare) {
- job->job.ret = job->driver->prepare(job);
- }
- return job->job.ret;
-}
-
-static void block_job_cancel_async(BlockJob *job, bool force)
-{
- if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) {
- block_job_iostatus_reset(job);
- }
- if (job->job.user_paused) {
- /* Do not call block_job_enter here, the caller will handle it. */
- job->job.user_paused = false;
- job->job.pause_count--;
- }
- job->job.cancelled = true;
- /* To prevent 'force == false' overriding a previous 'force == true' */
- job->force |= force;
+ aio_wait_kick();
}
-static int block_job_txn_apply(BlockJobTxn *txn, int fn(BlockJob *), bool lock)
-{
- AioContext *ctx;
- BlockJob *job, *next;
- int rc = 0;
-
- QLIST_FOREACH_SAFE(job, &txn->jobs, txn_list, next) {
- if (lock) {
- ctx = blk_get_aio_context(job->blk);
- aio_context_acquire(ctx);
- }
- rc = fn(job);
- if (lock) {
- aio_context_release(ctx);
- }
- if (rc) {
- break;
- }
- }
- return rc;
-}
-
-static int block_job_finish_sync(BlockJob *job,
- void (*finish)(BlockJob *, Error **errp),
- Error **errp)
-{
- Error *local_err = NULL;
- int ret;
-
- assert(blk_bs(job->blk)->job == job);
-
- job_ref(&job->job);
-
- if (finish) {
- finish(job, &local_err);
- }
- if (local_err) {
- error_propagate(errp, local_err);
- job_unref(&job->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->job.deferred_to_main_loop && !job_is_completed(&job->job)) {
- block_job_drain(job);
- }
- while (!job_is_completed(&job->job)) {
- aio_poll(qemu_get_aio_context(), true);
- }
- ret = (job_is_cancelled(&job->job) && job->job.ret == 0)
- ? -ECANCELED : job->job.ret;
- job_unref(&job->job);
- return ret;
-}
-
-static void block_job_completed_txn_abort(BlockJob *job)
-{
- AioContext *ctx;
- BlockJobTxn *txn = job->txn;
- BlockJob *other_job;
-
- if (txn->aborting) {
- /*
- * We are cancelled by another job, which will handle everything.
- */
- return;
- }
- txn->aborting = true;
- block_job_txn_ref(txn);
-
- /* We are the first failed job. Cancel other jobs. */
- QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
- ctx = blk_get_aio_context(other_job->blk);
- aio_context_acquire(ctx);
- }
-
- /* Other jobs are effectively cancelled by us, set the status for
- * them; this job, however, may or may not be cancelled, depending
- * on the caller, so leave it. */
- QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
- if (other_job != job) {
- block_job_cancel_async(other_job, false);
- }
- }
- while (!QLIST_EMPTY(&txn->jobs)) {
- other_job = QLIST_FIRST(&txn->jobs);
- ctx = blk_get_aio_context(other_job->blk);
- if (!job_is_completed(&other_job->job)) {
- assert(job_is_cancelled(&other_job->job));
- block_job_finish_sync(other_job, NULL, NULL);
- }
- job_finalize_single(&other_job->job);
- aio_context_release(ctx);
- }
-
- block_job_txn_unref(txn);
-}
-
-static int block_job_needs_finalize(BlockJob *job)
-{
- return !job->job.auto_finalize;
-}
-
-static int block_job_finalize_single(BlockJob *job)
-{
- return job_finalize_single(&job->job);
-}
-
-static void block_job_do_finalize(BlockJob *job)
-{
- int rc;
- assert(job && job->txn);
-
- /* prepare the transaction to complete */
- rc = block_job_txn_apply(job->txn, block_job_prepare, true);
- if (rc) {
- block_job_completed_txn_abort(job);
- } else {
- block_job_txn_apply(job->txn, block_job_finalize_single, true);
- }
-}
-
-static int block_job_transition_to_pending(BlockJob *job)
+bool block_job_is_internal(BlockJob *job)
{
- job_state_transition(&job->job, JOB_STATUS_PENDING);
- if (!job->job.auto_finalize) {
- job_event_pending(&job->job);
- }
- return 0;
+ return (job->job.id == NULL);
}
-static void block_job_completed_txn_success(BlockJob *job)
+const BlockJobDriver *block_job_driver(BlockJob *job)
{
- BlockJobTxn *txn = job->txn;
- BlockJob *other_job;
-
- job_state_transition(&job->job, JOB_STATUS_WAITING);
-
- /*
- * Successful completion, see if there are other running jobs in this
- * txn.
- */
- QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
- if (!job_is_completed(&other_job->job)) {
- return;
- }
- assert(other_job->job.ret == 0);
- }
-
- block_job_txn_apply(txn, block_job_transition_to_pending, false);
-
- /* If no jobs need manual finalization, automatically do so */
- if (block_job_txn_apply(txn, block_job_needs_finalize, false) == 0) {
- block_job_do_finalize(job);
- }
+ return container_of(job->job.driver, BlockJobDriver, job_driver);
}
/* Assumes the job_mutex is held */
return ratelimit_calculate_delay(&job->limit, n);
}
-void block_job_complete(BlockJob *job, Error **errp)
-{
- /* Should not be reachable via external interface for internal jobs */
- assert(job->job.id);
- if (job_apply_verb(&job->job, JOB_VERB_COMPLETE, errp)) {
- return;
- }
- if (job->job.pause_count || job_is_cancelled(&job->job) ||
- !job->driver->complete)
- {
- error_setg(errp, "The active block job '%s' cannot be completed",
- job->job.id);
- return;
- }
-
- job->driver->complete(job, errp);
-}
-
-void block_job_finalize(BlockJob *job, Error **errp)
-{
- assert(job && job->job.id);
- if (job_apply_verb(&job->job, JOB_VERB_FINALIZE, errp)) {
- return;
- }
- block_job_do_finalize(job);
-}
-
-void block_job_dismiss(BlockJob **jobptr, Error **errp)
-{
- BlockJob *job = *jobptr;
- /* similarly to _complete, this is QMP-interface only. */
- assert(job->job.id);
- if (job_apply_verb(&job->job, JOB_VERB_DISMISS, errp)) {
- return;
- }
-
- job_do_dismiss(&job->job);
- *jobptr = NULL;
-}
-
-void block_job_cancel(BlockJob *job, bool force)
-{
- if (job->job.status == JOB_STATUS_CONCLUDED) {
- job_do_dismiss(&job->job);
- return;
- }
- block_job_cancel_async(job, force);
- if (!job_started(&job->job)) {
- block_job_completed(job, -ECANCELED);
- } else if (job->job.deferred_to_main_loop) {
- block_job_completed_txn_abort(job);
- } else {
- block_job_enter(job);
- }
-}
-
-void block_job_user_cancel(BlockJob *job, bool force, Error **errp)
-{
- if (job_apply_verb(&job->job, JOB_VERB_CANCEL, errp)) {
- return;
- }
- block_job_cancel(job, force);
-}
-
-/* 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, false);
-}
-
-int block_job_cancel_sync(BlockJob *job)
-{
- return block_job_finish_sync(job, &block_job_cancel_err, NULL);
-}
-
-void block_job_cancel_sync_all(void)
-{
- BlockJob *job;
- AioContext *aio_context;
-
- while ((job = block_job_next(NULL))) {
- aio_context = blk_get_aio_context(job->blk);
- aio_context_acquire(aio_context);
- block_job_cancel_sync(job);
- aio_context_release(aio_context);
- }
-}
-
-int block_job_complete_sync(BlockJob *job, Error **errp)
-{
- return block_job_finish_sync(job, &block_job_complete, errp);
-}
-
-void block_job_progress_update(BlockJob *job, uint64_t done)
-{
- job->offset += done;
-}
-
-void block_job_progress_set_remaining(BlockJob *job, uint64_t remaining)
-{
- job->len = job->offset + remaining;
-}
-
BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
{
BlockJobInfo *info;
info = g_new0(BlockJobInfo, 1);
info->type = g_strdup(job_type_str(&job->job));
info->device = g_strdup(job->job.id);
- info->len = job->len;
info->busy = atomic_read(&job->job.busy);
info->paused = job->job.pause_count > 0;
- info->offset = job->offset;
+ info->offset = job->job.progress_current;
+ info->len = job->job.progress_total;
info->speed = job->speed;
info->io_status = job->iostatus;
- info->ready = job->ready;
+ info->ready = job_is_ready(&job->job),
info->status = job->job.status;
info->auto_finalize = job->job.auto_finalize;
info->auto_dismiss = job->job.auto_dismiss;
qapi_event_send_block_job_cancelled(job_type(&job->job),
job->job.id,
- job->len,
- job->offset,
- job->speed,
- &error_abort);
+ job->job.progress_total,
+ job->job.progress_current,
+ job->speed);
}
static void block_job_event_completed(Notifier *n, void *opaque)
qapi_event_send_block_job_completed(job_type(&job->job),
job->job.id,
- job->len,
- job->offset,
+ job->job.progress_total,
+ job->job.progress_current,
job->speed,
!!msg,
- msg,
- &error_abort);
+ msg);
}
static void block_job_event_pending(Notifier *n, void *opaque)
}
qapi_event_send_block_job_pending(job_type(&job->job),
- job->job.id,
- &error_abort);
+ job->job.id);
}
+static void block_job_event_ready(Notifier *n, void *opaque)
+{
+ BlockJob *job = opaque;
+
+ if (block_job_is_internal(job)) {
+ return;
+ }
+
+ qapi_event_send_block_job_ready(job_type(&job->job),
+ job->job.id,
+ job->job.progress_total,
+ job->job.progress_current,
+ job->speed);
+}
+
+
/*
* API for block job drivers and the block layer. These functions are
* declared in blockjob_int.h.
*/
void *block_job_create(const char *job_id, const BlockJobDriver *driver,
- BlockJobTxn *txn, BlockDriverState *bs, uint64_t perm,
+ JobTxn *txn, BlockDriverState *bs, uint64_t perm,
uint64_t shared_perm, int64_t speed, int flags,
BlockCompletionFunc *cb, void *opaque, Error **errp)
{
return NULL;
}
- job = job_create(job_id, &driver->job_driver, blk_get_aio_context(blk),
+ job = job_create(job_id, &driver->job_driver, txn, blk_get_aio_context(blk),
flags, cb, opaque, errp);
if (job == NULL) {
blk_unref(blk);
assert(is_block_job(&job->job));
assert(job->job.driver->free == &block_job_free);
assert(job->job.driver->user_resume == &block_job_user_resume);
+ assert(job->job.driver->drain == &block_job_drain);
- job->driver = driver;
- job->blk = blk;
+ job->blk = blk;
job->finalize_cancelled_notifier.notify = block_job_event_cancelled;
job->finalize_completed_notifier.notify = block_job_event_completed;
job->pending_notifier.notify = block_job_event_pending;
+ job->ready_notifier.notify = block_job_event_ready;
+ job->idle_notifier.notify = block_job_on_idle;
notifier_list_add(&job->job.on_finalize_cancelled,
&job->finalize_cancelled_notifier);
notifier_list_add(&job->job.on_finalize_completed,
&job->finalize_completed_notifier);
notifier_list_add(&job->job.on_pending, &job->pending_notifier);
+ notifier_list_add(&job->job.on_ready, &job->ready_notifier);
+ notifier_list_add(&job->job.on_idle, &job->idle_notifier);
error_setg(&job->blocker, "block device is in use by block job: %s",
job_type_str(&job->job));
}
}
- /* Single jobs are modeled as single-job transactions for sake of
- * consolidating the job management logic */
- if (!txn) {
- txn = block_job_txn_new();
- block_job_txn_add_job(txn, job);
- block_job_txn_unref(txn);
- } else {
- block_job_txn_add_job(txn, job);
- }
-
return job;
}
-void block_job_completed(BlockJob *job, int ret)
-{
- assert(job && job->txn && !job_is_completed(&job->job));
- assert(blk_bs(job->blk)->job == job);
- job->job.ret = ret;
- job_update_rc(&job->job);
- trace_block_job_completed(job, ret, job->job.ret);
- if (job->job.ret) {
- block_job_completed_txn_abort(job);
- } else {
- block_job_completed_txn_success(job);
- }
-}
-
-void block_job_enter(BlockJob *job)
-{
- job_enter_cond(&job->job, NULL);
-}
-
-void block_job_yield(BlockJob *job)
-{
- assert(job->job.busy);
-
- /* Check cancellation *before* setting busy = false, too! */
- if (job_is_cancelled(&job->job)) {
- return;
- }
-
- if (!job_should_pause(&job->job)) {
- job_do_yield(&job->job, -1);
- }
-
- job_pause_point(&job->job);
-}
-
void block_job_iostatus_reset(BlockJob *job)
{
if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
block_job_iostatus_reset(bjob);
}
-void block_job_event_ready(BlockJob *job)
-{
- job_state_transition(&job->job, JOB_STATUS_READY);
- job->ready = true;
-
- if (block_job_is_internal(job)) {
- return;
- }
-
- qapi_event_send_block_job_ready(job_type(&job->job),
- job->job.id,
- job->len,
- job->offset,
- job->speed, &error_abort);
-}
-
BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
int is_read, int error)
{
qapi_event_send_block_job_error(job->job.id,
is_read ? IO_OPERATION_TYPE_READ :
IO_OPERATION_TYPE_WRITE,
- action, &error_abort);
+ action);
}
if (action == BLOCK_ERROR_ACTION_STOP) {
- job_pause(&job->job);
- /* make the pause user visible, which will be resumed from QMP. */
- job->job.user_paused = true;
+ if (!job->job.user_paused) {
+ job_pause(&job->job);
+ /* make the pause user visible, which will be resumed from QMP. */
+ job->job.user_paused = true;
+ }
block_job_iostatus_set_err(job, error);
}
return action;
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