*/
#include "qemu/osdep.h"
-#include "qemu-common.h"
#include "block/block.h"
#include "block/blockjob_int.h"
#include "block/block_int.h"
#include "qemu/coroutine.h"
#include "qemu/timer.h"
-/* Right now, this mutex is only needed to synchronize accesses to job->busy
- * and job->sleep_timer, such as concurrent calls to block_job_do_yield and
- * block_job_enter. */
-static QemuMutex block_job_mutex;
-
-static void block_job_lock(void)
-{
- qemu_mutex_lock(&block_job_mutex);
-}
-
-static void block_job_unlock(void)
-{
- qemu_mutex_unlock(&block_job_mutex);
-}
-
-static void __attribute__((__constructor__)) block_job_init(void)
-{
- qemu_mutex_init(&block_job_mutex);
-}
-
-static void block_job_event_cancelled(BlockJob *job);
-static void block_job_event_completed(BlockJob *job, const char *msg);
-static int block_job_event_pending(BlockJob *job);
-static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job));
-
-/* 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);
-}
-
-static 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;
- }
-}
-
-/* Assumes the block_job_mutex is held */
-static bool block_job_timer_pending(BlockJob *job)
-{
- return timer_pending(&job->sleep_timer);
-}
-
-/* Assumes the block_job_mutex is held */
-static bool block_job_timer_not_pending(BlockJob *job)
-{
- return !block_job_timer_pending(job);
-}
-
-static void block_job_pause(BlockJob *job)
-{
- job->pause_count++;
-}
-
-static void block_job_resume(BlockJob *job)
-{
- assert(job->pause_count > 0);
- job->pause_count--;
- if (job->pause_count) {
- return;
- }
-
- /* kick only if no timer is pending */
- block_job_enter_cond(job, block_job_timer_not_pending);
-}
-
-static void block_job_attached_aio_context(AioContext *new_context,
- void *opaque);
-static void block_job_detach_aio_context(void *opaque);
-
void block_job_free(Job *job)
{
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,
- block_job_attached_aio_context,
- block_job_detach_aio_context, bjob);
blk_unref(bjob->blk);
error_free(bjob->blocker);
- assert(!timer_pending(&bjob->sleep_timer));
}
-static void block_job_attached_aio_context(AioContext *new_context,
- void *opaque)
+void block_job_drain(Job *job)
{
- BlockJob *job = opaque;
+ BlockJob *bjob = container_of(job, BlockJob, job);
+ const JobDriver *drv = 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);
+ blk_drain(bjob->blk);
+ if (bjdrv->drain) {
+ bjdrv->drain(bjob);
}
-
- block_job_resume(job);
}
-static void block_job_drain(BlockJob *job)
+static char *child_job_get_parent_desc(BdrvChild *c)
{
- /* 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);
- }
+ BlockJob *job = c->opaque;
+ return g_strdup_printf("%s job '%s'", job_type_str(&job->job), job->job.id);
}
-static void block_job_detach_aio_context(void *opaque)
+static void child_job_drained_begin(BdrvChild *c)
{
- BlockJob *job = opaque;
-
- /* In case the job terminates during aio_poll()... */
- job_ref(&job->job);
+ BlockJob *job = c->opaque;
+ job_pause(&job->job);
+}
- block_job_pause(job);
+static bool child_job_drained_poll(BdrvChild *c)
+{
+ BlockJob *bjob = c->opaque;
+ Job *job = &bjob->job;
+ const BlockJobDriver *drv = block_job_driver(bjob);
- while (!job->paused && !job->completed) {
- block_job_drain(job);
+ /* 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;
}
- job->job.aio_context = NULL;
- job_unref(&job->job);
+ /* 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 char *child_job_get_parent_desc(BdrvChild *c)
+static void child_job_drained_end(BdrvChild *c)
{
BlockJob *job = c->opaque;
- return g_strdup_printf("%s job '%s'", job_type_str(&job->job), job->job.id);
+ job_resume(&job->job);
}
-static void child_job_drained_begin(BdrvChild *c)
+static bool child_job_can_set_aio_ctx(BdrvChild *c, AioContext *ctx,
+ GSList **ignore, Error **errp)
{
BlockJob *job = c->opaque;
- block_job_pause(job);
+ GSList *l;
+
+ for (l = job->nodes; l; l = l->next) {
+ BdrvChild *sibling = l->data;
+ if (!bdrv_child_can_set_aio_context(sibling, ctx, ignore, errp)) {
+ return false;
+ }
+ }
+ return true;
}
-static void child_job_drained_end(BdrvChild *c)
+static void child_job_set_aio_ctx(BdrvChild *c, AioContext *ctx,
+ GSList **ignore)
{
BlockJob *job = c->opaque;
- block_job_resume(job);
+ GSList *l;
+
+ for (l = job->nodes; l; l = l->next) {
+ BdrvChild *sibling = l->data;
+ if (g_slist_find(*ignore, sibling)) {
+ continue;
+ }
+ *ignore = g_slist_prepend(*ignore, sibling);
+ bdrv_set_aio_context_ignore(sibling->bs, ctx, ignore);
+ }
+
+ job->job.aio_context = ctx;
}
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,
+ .can_set_aio_ctx = child_job_can_set_aio_ctx,
+ .set_aio_ctx = child_job_set_aio_ctx,
.stay_at_node = true,
};
job->nodes = NULL;
}
-int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
- uint64_t perm, uint64_t shared_perm, Error **errp)
+bool block_job_has_bdrv(BlockJob *job, BlockDriverState *bs)
{
- BdrvChild *c;
-
- c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm,
- job, errp);
- if (c == NULL) {
- return -EPERM;
- }
-
- job->nodes = g_slist_prepend(job->nodes, c);
- bdrv_ref(bs);
- bdrv_op_block_all(bs, job->blocker);
+ GSList *el;
- return 0;
-}
-
-bool block_job_is_internal(BlockJob *job)
-{
- return (job->job.id == NULL);
-}
-
-static bool block_job_started(BlockJob *job)
-{
- return job->co;
-}
-
-const BlockJobDriver *block_job_driver(BlockJob *job)
-{
- return job->driver;
-}
-
-/**
- * All jobs must allow a pause point before entering their job proper. This
- * ensures that jobs can be paused prior to being started, then resumed later.
- */
-static void coroutine_fn block_job_co_entry(void *opaque)
-{
- BlockJob *job = opaque;
-
- assert(job && job->driver && job->driver->start);
- block_job_pause_point(job);
- job->driver->start(job);
-}
-
-static void block_job_sleep_timer_cb(void *opaque)
-{
- BlockJob *job = opaque;
-
- block_job_enter(job);
-}
-
-void block_job_start(BlockJob *job)
-{
- assert(job && !block_job_started(job) && job->paused &&
- job->driver && job->driver->start);
- job->co = qemu_coroutine_create(block_job_co_entry, job);
- job->pause_count--;
- job->busy = true;
- job->paused = false;
- job_state_transition(&job->job, JOB_STATUS_RUNNING);
- bdrv_coroutine_enter(blk_bs(job->blk), job->co);
-}
-
-static void block_job_decommission(BlockJob *job)
-{
- assert(job);
- job->completed = true;
- job->busy = false;
- job->paused = false;
- job->deferred_to_main_loop = true;
- block_job_txn_del_job(job);
- job_state_transition(&job->job, JOB_STATUS_NULL);
- job_unref(&job->job);
-}
-
-static void block_job_do_dismiss(BlockJob *job)
-{
- block_job_decommission(job);
-}
-
-static void block_job_conclude(BlockJob *job)
-{
- job_state_transition(&job->job, JOB_STATUS_CONCLUDED);
- if (job->auto_dismiss || !block_job_started(job)) {
- block_job_do_dismiss(job);
- }
-}
-
-static void block_job_update_rc(BlockJob *job)
-{
- if (!job->ret && job_is_cancelled(&job->job)) {
- job->ret = -ECANCELED;
- }
- if (job->ret) {
- job_state_transition(&job->job, JOB_STATUS_ABORTING);
+ for (el = job->nodes; el; el = el->next) {
+ BdrvChild *c = el->data;
+ if (c->bs == bs) {
+ return true;
+ }
}
-}
-static int block_job_prepare(BlockJob *job)
-{
- if (job->ret == 0 && job->driver->prepare) {
- job->ret = job->driver->prepare(job);
- }
- return job->ret;
+ return false;
}
-static void block_job_commit(BlockJob *job)
+int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
+ uint64_t perm, uint64_t shared_perm, Error **errp)
{
- assert(!job->ret);
- if (job->driver->commit) {
- job->driver->commit(job);
- }
-}
+ BdrvChild *c;
-static void block_job_abort(BlockJob *job)
-{
- assert(job->ret);
- if (job->driver->abort) {
- job->driver->abort(job);
+ bdrv_ref(bs);
+ if (job->job.aio_context != qemu_get_aio_context()) {
+ aio_context_release(job->job.aio_context);
}
-}
-
-static void block_job_clean(BlockJob *job)
-{
- if (job->driver->clean) {
- job->driver->clean(job);
+ c = bdrv_root_attach_child(bs, name, &child_job, job->job.aio_context,
+ perm, shared_perm, job, errp);
+ if (job->job.aio_context != qemu_get_aio_context()) {
+ aio_context_acquire(job->job.aio_context);
}
-}
-
-static int block_job_finalize_single(BlockJob *job)
-{
- assert(job->completed);
-
- /* Ensure abort is called for late-transactional failures */
- block_job_update_rc(job);
-
- if (!job->ret) {
- block_job_commit(job);
- } else {
- block_job_abort(job);
- }
- block_job_clean(job);
-
- if (job->cb) {
- job->cb(job->opaque, job->ret);
+ if (c == NULL) {
+ return -EPERM;
}
- /* Emit events only if we actually started */
- if (block_job_started(job)) {
- if (job_is_cancelled(&job->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);
- }
- }
+ job->nodes = g_slist_prepend(job->nodes, c);
+ bdrv_op_block_all(bs, job->blocker);
- block_job_txn_del_job(job);
- block_job_conclude(job);
return 0;
}
-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->user_paused) {
- /* Do not call block_job_enter here, the caller will handle it. */
- job->user_paused = false;
- job->pause_count--;
- }
- job->job.cancelled = true;
- /* To prevent 'force == false' overriding a previous 'force == true' */
- job->force |= force;
-}
-
-static int block_job_txn_apply(BlockJobTxn *txn, int fn(BlockJob *), bool lock)
+static void block_job_on_idle(Notifier *n, void *opaque)
{
- 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;
+ aio_wait_kick();
}
-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->deferred_to_main_loop && !job->completed) {
- block_job_drain(job);
- }
- while (!job->completed) {
- aio_poll(qemu_get_aio_context(), true);
- }
- ret = (job_is_cancelled(&job->job) && job->ret == 0)
- ? -ECANCELED : 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 (!other_job->completed) {
- assert(job_is_cancelled(&other_job->job));
- block_job_finish_sync(other_job, NULL, NULL);
- }
- block_job_finalize_single(other_job);
- aio_context_release(ctx);
- }
-
- block_job_txn_unref(txn);
-}
-
-static int block_job_needs_finalize(BlockJob *job)
+bool block_job_is_internal(BlockJob *job)
{
- return !job->auto_finalize;
+ return (job->job.id == NULL);
}
-static void block_job_do_finalize(BlockJob *job)
+const BlockJobDriver *block_job_driver(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);
- }
+ return container_of(job->job.driver, BlockJobDriver, job_driver);
}
-static void block_job_completed_txn_success(BlockJob *job)
+/* Assumes the job_mutex is held */
+static bool job_timer_pending(Job *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 (!other_job->completed) {
- return;
- }
- assert(other_job->ret == 0);
- }
-
- block_job_txn_apply(txn, block_job_event_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 timer_pending(&job->sleep_timer);
}
void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
}
/* kick only if a timer is pending */
- block_job_enter_cond(job, block_job_timer_pending);
+ job_enter_cond(&job->job, job_timer_pending);
}
int64_t block_job_ratelimit_get_delay(BlockJob *job, uint64_t n)
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->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;
- }
-
- block_job_do_dismiss(job);
- *jobptr = NULL;
-}
-
-void block_job_user_pause(BlockJob *job, Error **errp)
-{
- if (job_apply_verb(&job->job, JOB_VERB_PAUSE, errp)) {
- return;
- }
- if (job->user_paused) {
- error_setg(errp, "Job is already paused");
- return;
- }
- job->user_paused = true;
- block_job_pause(job);
-}
-
-bool block_job_user_paused(BlockJob *job)
-{
- return job->user_paused;
-}
-
-void block_job_user_resume(BlockJob *job, Error **errp)
-{
- assert(job);
- if (!job->user_paused || job->pause_count <= 0) {
- error_setg(errp, "Can't resume a job that was not paused");
- return;
- }
- if (job_apply_verb(&job->job, JOB_VERB_RESUME, errp)) {
- return;
- }
- block_job_iostatus_reset(job);
- job->user_paused = false;
- block_job_resume(job);
-}
-
-void block_job_cancel(BlockJob *job, bool force)
-{
- if (job->job.status == JOB_STATUS_CONCLUDED) {
- block_job_do_dismiss(job);
- return;
- }
- block_job_cancel_async(job, force);
- if (!block_job_started(job)) {
- block_job_completed(job, -ECANCELED);
- } else if (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->busy);
- info->paused = job->pause_count > 0;
- info->offset = job->offset;
+ info->busy = atomic_read(&job->job.busy);
+ info->paused = job->job.pause_count > 0;
+ 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->auto_finalize;
- info->auto_dismiss = job->auto_dismiss;
- info->has_error = job->ret != 0;
- info->error = job->ret ? g_strdup(strerror(-job->ret)) : NULL;
+ info->auto_finalize = job->job.auto_finalize;
+ info->auto_dismiss = job->job.auto_dismiss;
+ info->has_error = job->job.ret != 0;
+ info->error = job->job.ret ? g_strdup(strerror(-job->job.ret)) : NULL;
return info;
}
}
}
-static void block_job_event_cancelled(BlockJob *job)
+static void block_job_event_cancelled(Notifier *n, void *opaque)
{
+ BlockJob *job = opaque;
+
if (block_job_is_internal(job)) {
return;
}
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(BlockJob *job, const char *msg)
+static void block_job_event_completed(Notifier *n, void *opaque)
{
+ BlockJob *job = opaque;
+ const char *msg = NULL;
+
if (block_job_is_internal(job)) {
return;
}
+ if (job->job.ret < 0) {
+ msg = strerror(-job->job.ret);
+ }
+
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 int block_job_event_pending(BlockJob *job)
+static void block_job_event_pending(Notifier *n, void *opaque)
{
- job_state_transition(&job->job, JOB_STATUS_PENDING);
- if (!job->auto_finalize && !block_job_is_internal(job)) {
- qapi_event_send_block_job_pending(job_type(&job->job),
- job->job.id,
- &error_abort);
+ BlockJob *job = opaque;
+
+ if (block_job_is_internal(job)) {
+ return;
}
- return 0;
+
+ qapi_event_send_block_job_pending(job_type(&job->job),
+ 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)
{
BlockJob *job;
int ret;
- if (bs->job) {
- error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
- return NULL;
- }
-
- if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) {
+ if (job_id == NULL && !(flags & 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;
- }
- }
-
- blk = blk_new(perm, shared_perm);
+ blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
blk_unref(blk);
return NULL;
}
- job = job_create(job_id, &driver->job_driver, blk_get_aio_context(blk),
- errp);
+ job = job_create(job_id, &driver->job_driver, txn, blk_get_aio_context(blk),
+ flags, cb, opaque, errp);
if (job == NULL) {
blk_unref(blk);
return NULL;
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->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;
- job->driver = driver;
- job->blk = blk;
- job->cb = cb;
- job->opaque = opaque;
- job->busy = false;
- job->paused = true;
- job->pause_count = 1;
- job->auto_finalize = !(flags & BLOCK_JOB_MANUAL_FINALIZE);
- job->auto_dismiss = !(flags & BLOCK_JOB_MANUAL_DISMISS);
- aio_timer_init(qemu_get_aio_context(), &job->sleep_timer,
- QEMU_CLOCK_REALTIME, SCALE_NS,
- block_job_sleep_timer_cb, job);
+ 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));
block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort);
- bs->job = job;
bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
- blk_add_aio_context_notifier(blk, block_job_attached_aio_context,
- block_job_detach_aio_context, job);
+ blk_set_allow_aio_context_change(blk, true);
/* Only set speed when necessary to avoid NotSupported error */
if (speed != 0) {
block_job_set_speed(job, speed, &local_err);
if (local_err) {
- block_job_early_fail(job);
+ job_early_fail(&job->job);
error_propagate(errp, local_err);
return NULL;
}
}
- /* 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_early_fail(BlockJob *job)
-{
- assert(job->job.status == JOB_STATUS_CREATED);
- block_job_decommission(job);
-}
-
-void block_job_completed(BlockJob *job, int ret)
-{
- assert(job && job->txn && !job->completed);
- assert(blk_bs(job->blk)->job == job);
- job->completed = true;
- job->ret = ret;
- block_job_update_rc(job);
- trace_block_job_completed(job, ret, job->ret);
- if (job->ret) {
- block_job_completed_txn_abort(job);
- } else {
- block_job_completed_txn_success(job);
- }
-}
-
-static bool block_job_should_pause(BlockJob *job)
-{
- return job->pause_count > 0;
-}
-
-/* Yield, and schedule a timer to reenter the coroutine after @ns nanoseconds.
- * Reentering the job coroutine with block_job_enter() before the timer has
- * expired is allowed and cancels the timer.
- *
- * If @ns is (uint64_t) -1, no timer is scheduled and block_job_enter() must be
- * called explicitly. */
-static void block_job_do_yield(BlockJob *job, uint64_t ns)
-{
- block_job_lock();
- if (ns != -1) {
- timer_mod(&job->sleep_timer, ns);
- }
- job->busy = false;
- block_job_unlock();
- qemu_coroutine_yield();
-
- /* Set by block_job_enter before re-entering the coroutine. */
- assert(job->busy);
-}
-
-void coroutine_fn block_job_pause_point(BlockJob *job)
-{
- assert(job && block_job_started(job));
-
- if (!block_job_should_pause(job)) {
- return;
- }
- if (job_is_cancelled(&job->job)) {
- return;
- }
-
- if (job->driver->pause) {
- job->driver->pause(job);
- }
-
- if (block_job_should_pause(job) && !job_is_cancelled(&job->job)) {
- JobStatus status = job->job.status;
- job_state_transition(&job->job, status == JOB_STATUS_READY
- ? JOB_STATUS_STANDBY
- : JOB_STATUS_PAUSED);
- job->paused = true;
- block_job_do_yield(job, -1);
- job->paused = false;
- job_state_transition(&job->job, status);
- }
-
- if (job->driver->resume) {
- job->driver->resume(job);
- }
-}
-
-/*
- * Conditionally enter a block_job pending a call to fn() while
- * under the block_job_lock critical section.
- */
-static void block_job_enter_cond(BlockJob *job, bool(*fn)(BlockJob *job))
-{
- if (!block_job_started(job)) {
- return;
- }
- if (job->deferred_to_main_loop) {
- return;
- }
-
- block_job_lock();
- if (job->busy) {
- block_job_unlock();
- return;
- }
-
- if (fn && !fn(job)) {
- block_job_unlock();
- return;
- }
-
- assert(!job->deferred_to_main_loop);
- timer_del(&job->sleep_timer);
- job->busy = true;
- block_job_unlock();
- aio_co_wake(job->co);
-}
-
-void block_job_enter(BlockJob *job)
-{
- block_job_enter_cond(job, NULL);
-}
-
-void block_job_sleep_ns(BlockJob *job, int64_t ns)
-{
- assert(job->busy);
-
- /* Check cancellation *before* setting busy = false, too! */
- if (job_is_cancelled(&job->job)) {
- return;
- }
-
- if (!block_job_should_pause(job)) {
- block_job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns);
- }
-
- block_job_pause_point(job);
-}
-
-void block_job_yield(BlockJob *job)
-{
- assert(job->busy);
-
- /* Check cancellation *before* setting busy = false, too! */
- if (job_is_cancelled(&job->job)) {
- return;
- }
-
- if (!block_job_should_pause(job)) {
- block_job_do_yield(job, -1);
- }
-
- block_job_pause_point(job);
-}
-
void block_job_iostatus_reset(BlockJob *job)
{
if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
return;
}
- assert(job->user_paused && job->pause_count > 0);
+ assert(job->job.user_paused && job->job.pause_count > 0);
job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
}
-void block_job_event_ready(BlockJob *job)
+void block_job_user_resume(Job *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);
+ BlockJob *bjob = container_of(job, BlockJob, job);
+ block_job_iostatus_reset(bjob);
}
BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
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) {
- block_job_pause(job);
- /* make the pause user visible, which will be resumed from QMP. */
- 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;
}
-
-typedef struct {
- BlockJob *job;
- 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;
-
- /* 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 = blk_get_aio_context(data->job->blk);
- if (aio_context != data->aio_context) {
- aio_context_acquire(aio_context);
- }
-
- data->fn(data->job, data->opaque);
-
- if (aio_context != data->aio_context) {
- 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->aio_context = blk_get_aio_context(job->blk);
- data->fn = fn;
- data->opaque = opaque;
- job->deferred_to_main_loop = true;
-
- aio_bh_schedule_oneshot(qemu_get_aio_context(),
- block_job_defer_to_main_loop_bh, data);
-}
projects / qemu.git / blobdiff