#include "qemu/timer.h"
#include "qapi-event.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 QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs);
-static char *child_job_get_parent_desc(BdrvChild *c)
-{
- BlockJob *job = c->opaque;
- return g_strdup_printf("%s job '%s'",
- BlockJobType_lookup[job->driver->job_type],
- job->id);
-}
-
-static const BdrvChildRole child_job = {
- .get_parent_desc = child_job_get_parent_desc,
- .stay_at_node = true,
-};
+/*
+ * The block job API is composed of two categories of functions.
+ *
+ * The first includes functions used by the monitor. The monitor is
+ * peculiar in that it accesses the block job list with block_job_get, and
+ * therefore needs consistency across block_job_get and the actual operation
+ * (e.g. block_job_set_speed). The consistency is achieved with
+ * aio_context_acquire/release. These functions are declared in blockjob.h.
+ *
+ * The second includes functions used by the block job drivers and sometimes
+ * by the core block layer. These do not care about locking, because the
+ * whole coroutine runs under the AioContext lock, and are declared in
+ * blockjob_int.h.
+ */
BlockJob *block_job_next(BlockJob *job)
{
return NULL;
}
+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_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;
+ }
+ block_job_enter(job);
+}
+
+void block_job_ref(BlockJob *job)
+{
+ ++job->refcnt;
+}
+
+static void block_job_attached_aio_context(AioContext *new_context,
+ void *opaque);
+static void block_job_detach_aio_context(void *opaque);
+
+void block_job_unref(BlockJob *job)
+{
+ if (--job->refcnt == 0) {
+ BlockDriverState *bs = blk_bs(job->blk);
+ QLIST_REMOVE(job, job_list);
+ bs->job = NULL;
+ block_job_remove_all_bdrv(job);
+ 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);
+ assert(!timer_pending(&job->sleep_timer));
+ g_free(job);
+ }
+}
+
static void block_job_attached_aio_context(AioContext *new_context,
void *opaque)
{
block_job_unref(job);
}
+static char *child_job_get_parent_desc(BdrvChild *c)
+{
+ BlockJob *job = c->opaque;
+ return g_strdup_printf("%s job '%s'",
+ BlockJobType_str(job->driver->job_type),
+ job->id);
+}
+
+static const BdrvChildRole child_job = {
+ .get_parent_desc = child_job_get_parent_desc,
+ .stay_at_node = true,
+};
+
+static void block_job_drained_begin(void *opaque)
+{
+ BlockJob *job = opaque;
+ block_job_pause(job);
+}
+
+static void block_job_drained_end(void *opaque)
+{
+ BlockJob *job = opaque;
+ block_job_resume(job);
+}
+
+static const BlockDevOps block_job_dev_ops = {
+ .drained_begin = block_job_drained_begin,
+ .drained_end = block_job_drained_end,
+};
+
void block_job_remove_all_bdrv(BlockJob *job)
{
GSList *l;
return 0;
}
-void *block_job_create(const char *job_id, const BlockJobDriver *driver,
- BlockDriverState *bs, uint64_t perm,
- uint64_t shared_perm, int64_t speed, int flags,
- BlockCompletionFunc *cb, void *opaque, Error **errp)
-{
- BlockBackend *blk;
- 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)) {
- 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(perm, shared_perm);
- ret = blk_insert_bs(blk, bs, errp);
- if (ret < 0) {
- blk_unref(blk);
- return NULL;
- }
-
- job = g_malloc0(driver->instance_size);
- error_setg(&job->blocker, "block device is in use by block job: %s",
- BlockJobType_lookup[driver->job_type]);
- block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort);
- bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
-
- job->driver = driver;
- job->id = g_strdup(job_id);
- job->blk = blk;
- job->cb = cb;
- job->opaque = opaque;
- job->busy = false;
- job->paused = true;
- job->pause_count = 1;
- job->refcnt = 1;
- bs->job = job;
-
- 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;
-
- block_job_set_speed(job, speed, &local_err);
- if (local_err) {
- block_job_unref(job);
- error_propagate(errp, local_err);
- return NULL;
- }
- }
- return job;
-}
-
bool block_job_is_internal(BlockJob *job)
{
return (job->id == NULL);
return job->co;
}
-void block_job_start(BlockJob *job)
+/**
+ * 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)
{
- assert(job && !block_job_started(job) && job->paused &&
- !job->busy && job->driver->start);
- job->co = qemu_coroutine_create(job->driver->start, job);
- if (--job->pause_count == 0) {
- job->paused = false;
- job->busy = true;
- qemu_coroutine_enter(job->co);
- }
+ BlockJob *job = opaque;
+
+ assert(job && job->driver && job->driver->start);
+ block_job_pause_point(job);
+ job->driver->start(job);
}
-void block_job_ref(BlockJob *job)
+static void block_job_sleep_timer_cb(void *opaque)
{
- ++job->refcnt;
+ BlockJob *job = opaque;
+
+ block_job_enter(job);
}
-void block_job_unref(BlockJob *job)
+void block_job_start(BlockJob *job)
{
- if (--job->refcnt == 0) {
- BlockDriverState *bs = blk_bs(job->blk);
- bs->job = NULL;
- block_job_remove_all_bdrv(job);
- 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);
- QLIST_REMOVE(job, job_list);
- g_free(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;
+ bdrv_coroutine_enter(blk_bs(job->blk), job->co);
}
static void block_job_completed_single(BlockJob *job)
{
+ assert(job->completed);
+
if (!job->ret) {
if (job->driver->commit) {
job->driver->commit(job);
block_job_unref(job);
}
-static void block_job_completed_txn_abort(BlockJob *job)
+static void block_job_cancel_async(BlockJob *job)
{
- AioContext *ctx;
- BlockJobTxn *txn = job->txn;
- BlockJob *other_job, *next;
-
- if (txn->aborting) {
- /*
- * We are cancelled by another job, which will handle everything.
- */
- return;
- }
- txn->aborting = true;
- /* 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);
+ if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) {
+ block_job_iostatus_reset(job);
}
- QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
- if (other_job == job || other_job->completed) {
- /* 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. */
- if (other_job != job) {
- other_job->cancelled = true;
- }
- continue;
- }
- block_job_cancel_sync(other_job);
- assert(other_job->completed);
+ if (job->user_paused) {
+ /* Do not call block_job_enter here, the caller will handle it. */
+ job->user_paused = false;
+ job->pause_count--;
}
- QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
- ctx = blk_get_aio_context(other_job->blk);
- block_job_completed_single(other_job);
+ job->cancelled = true;
+}
+
+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);
+
+ block_job_ref(job);
+
+ if (finish) {
+ 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(qemu_get_aio_context(), true);
+ }
+ ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
+ block_job_unref(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);
+ }
+ }
+ while (!QLIST_EMPTY(&txn->jobs)) {
+ other_job = QLIST_FIRST(&txn->jobs);
+ ctx = blk_get_aio_context(other_job->blk);
+ if (!other_job->completed) {
+ assert(other_job->cancelled);
+ block_job_finish_sync(other_job, NULL, NULL);
+ }
+ block_job_completed_single(other_job);
aio_context_release(ctx);
}
+
+ block_job_txn_unref(txn);
}
static void block_job_completed_txn_success(BlockJob *job)
return;
}
}
- /* We are the last completed job, commit the transaction. */
- QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
- ctx = blk_get_aio_context(other_job->blk);
- aio_context_acquire(ctx);
- assert(other_job->ret == 0);
- block_job_completed_single(other_job);
- aio_context_release(ctx);
+ /* We are the last completed job, commit the transaction. */
+ QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
+ ctx = blk_get_aio_context(other_job->blk);
+ aio_context_acquire(ctx);
+ assert(other_job->ret == 0);
+ block_job_completed_single(other_job);
+ aio_context_release(ctx);
+ }
+}
+
+void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
+{
+ Error *local_err = NULL;
+
+ if (!job->driver->set_speed) {
+ error_setg(errp, QERR_UNSUPPORTED);
+ return;
+ }
+ job->driver->set_speed(job, speed, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ job->speed = speed;
+}
+
+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 ||
+ !block_job_started(job) || !job->driver->complete) {
+ error_setg(errp, "The active block job '%s' cannot be completed",
+ job->id);
+ return;
+ }
+
+ job->driver->complete(job, errp);
+}
+
+void block_job_user_pause(BlockJob *job)
+{
+ 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)
+{
+ if (job && job->user_paused && job->pause_count > 0) {
+ block_job_iostatus_reset(job);
+ job->user_paused = false;
+ block_job_resume(job);
+ }
+}
+
+void block_job_cancel(BlockJob *job)
+{
+ if (block_job_started(job)) {
+ block_job_cancel_async(job);
+ block_job_enter(job);
+ } else {
+ block_job_completed(job, -ECANCELED);
+ }
+}
+
+/* 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);
+}
+
+void block_job_cancel_sync_all(void)
+{
+ BlockJob *job;
+ AioContext *aio_context;
+
+ while ((job = QLIST_FIRST(&block_jobs))) {
+ 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);
+}
+
+BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
+{
+ 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_str(job->driver->job_type));
+ info->device = g_strdup(job->id);
+ info->len = job->len;
+ info->busy = atomic_read(&job->busy);
+ 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;
+}
+
+static void block_job_iostatus_set_err(BlockJob *job, int error)
+{
+ if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
+ job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
+ BLOCK_DEVICE_IO_STATUS_FAILED;
+ }
+}
+
+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,
+ job->offset,
+ job->speed,
+ &error_abort);
+}
+
+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->offset,
+ job->speed,
+ !!msg,
+ msg,
+ &error_abort);
+}
+
+/*
+ * 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,
+ BlockDriverState *bs, uint64_t perm,
+ uint64_t shared_perm, int64_t speed, int flags,
+ BlockCompletionFunc *cb, void *opaque, Error **errp)
+{
+ BlockBackend *blk;
+ 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)) {
+ 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(perm, shared_perm);
+ ret = blk_insert_bs(blk, bs, errp);
+ if (ret < 0) {
+ blk_unref(blk);
+ return NULL;
+ }
+
+ job = g_malloc0(driver->instance_size);
+ job->driver = driver;
+ job->id = g_strdup(job_id);
+ job->blk = blk;
+ job->cb = cb;
+ job->opaque = opaque;
+ job->busy = false;
+ job->paused = true;
+ job->pause_count = 1;
+ job->refcnt = 1;
+ aio_timer_init(qemu_get_aio_context(), &job->sleep_timer,
+ QEMU_CLOCK_REALTIME, SCALE_NS,
+ block_job_sleep_timer_cb, job);
+
+ error_setg(&job->blocker, "block device is in use by block job: %s",
+ BlockJobType_str(driver->job_type));
+ block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort);
+ bs->job = job;
+
+ blk_set_dev_ops(blk, &block_job_dev_ops, job);
+ bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
+
+ 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;
+
+ block_job_set_speed(job, speed, &local_err);
+ if (local_err) {
+ block_job_unref(job);
+ error_propagate(errp, local_err);
+ return NULL;
+ }
+ }
+ return job;
+}
+
+void block_job_pause_all(void)
+{
+ BlockJob *job = NULL;
+ while ((job = block_job_next(job))) {
+ AioContext *aio_context = blk_get_aio_context(job->blk);
+
+ aio_context_acquire(aio_context);
+ block_job_ref(job);
+ block_job_pause(job);
+ aio_context_release(aio_context);
}
}
+void block_job_early_fail(BlockJob *job)
+{
+ block_job_unref(job);
+}
+
void block_job_completed(BlockJob *job, int ret)
{
assert(blk_bs(job->blk)->job == job);
}
}
-void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
-{
- Error *local_err = NULL;
-
- if (!job->driver->set_speed) {
- error_setg(errp, QERR_UNSUPPORTED);
- return;
- }
- job->driver->set_speed(job, speed, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- return;
- }
-
- job->speed = speed;
-}
-
-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 ||
- !block_job_started(job) || !job->driver->complete) {
- error_setg(errp, "The active block job '%s' cannot be completed",
- job->id);
- return;
- }
-
- job->driver->complete(job, errp);
-}
-
-void block_job_pause(BlockJob *job)
-{
- job->pause_count++;
-}
-
-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)
+/* 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)
{
- return job ? job->user_paused : 0;
+ 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)
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;
+ block_job_do_yield(job, -1);
job->paused = false;
}
}
}
-void block_job_resume(BlockJob *job)
+void block_job_resume_all(void)
{
- assert(job->pause_count > 0);
- job->pause_count--;
- if (job->pause_count) {
- return;
- }
- block_job_enter(job);
-}
+ BlockJob *job, *next;
-void block_job_user_resume(BlockJob *job)
-{
- if (job && job->user_paused && job->pause_count > 0) {
- job->user_paused = false;
+ QLIST_FOREACH_SAFE(job, &block_jobs, job_list, next) {
+ AioContext *aio_context = blk_get_aio_context(job->blk);
+
+ aio_context_acquire(aio_context);
block_job_resume(job);
+ block_job_unref(job);
+ aio_context_release(aio_context);
}
}
void block_job_enter(BlockJob *job)
{
- if (job->co && !job->busy) {
- qemu_coroutine_enter(job->co);
- }
-}
-
-void block_job_cancel(BlockJob *job)
-{
- if (block_job_started(job)) {
- job->cancelled = true;
- block_job_iostatus_reset(job);
- block_job_enter(job);
- } else {
- block_job_completed(job, -ECANCELED);
+ if (!block_job_started(job)) {
+ return;
}
-}
-
-bool block_job_is_cancelled(BlockJob *job)
-{
- return job->cancelled;
-}
-
-void block_job_iostatus_reset(BlockJob *job)
-{
- job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
- if (job->driver->iostatus_reset) {
- job->driver->iostatus_reset(job);
+ if (job->deferred_to_main_loop) {
+ return;
}
-}
-
-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);
-
- 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(qemu_get_aio_context(), true);
+ block_job_lock();
+ if (job->busy) {
+ block_job_unlock();
+ return;
}
- ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
- block_job_unref(job);
- return 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);
-}
-
-void block_job_cancel_sync_all(void)
-{
- BlockJob *job;
- AioContext *aio_context;
- while ((job = QLIST_FIRST(&block_jobs))) {
- aio_context = blk_get_aio_context(job->blk);
- aio_context_acquire(aio_context);
- block_job_cancel_sync(job);
- aio_context_release(aio_context);
- }
+ assert(!job->deferred_to_main_loop);
+ timer_del(&job->sleep_timer);
+ job->busy = true;
+ block_job_unlock();
+ aio_co_wake(job->co);
}
-int block_job_complete_sync(BlockJob *job, Error **errp)
+bool block_job_is_cancelled(BlockJob *job)
{
- return block_job_finish_sync(job, &block_job_complete, errp);
+ return job->cancelled;
}
-void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
+void block_job_sleep_ns(BlockJob *job, int64_t ns)
{
assert(job->busy);
return;
}
- job->busy = false;
if (!block_job_should_pause(job)) {
- co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns);
+ block_job_do_yield(job, qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + ns);
}
- job->busy = true;
block_job_pause_point(job);
}
return;
}
- job->busy = false;
if (!block_job_should_pause(job)) {
- qemu_coroutine_yield();
+ block_job_do_yield(job, -1);
}
- job->busy = true;
block_job_pause_point(job);
}
-BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
-{
- 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;
- info->busy = job->busy;
- 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;
-}
-
-static void block_job_iostatus_set_err(BlockJob *job, int error)
+void block_job_iostatus_reset(BlockJob *job)
{
if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
- job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
- BLOCK_DEVICE_IO_STATUS_FAILED;
- }
-}
-
-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,
- job->offset,
- job->speed,
- &error_abort);
-}
-
-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->offset,
- job->speed,
- !!msg,
- msg,
- &error_abort);
+ assert(job->user_paused && job->pause_count > 0);
+ job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
}
void block_job_event_ready(BlockJob *job)
/* Fetch BDS AioContext again, in case it has changed */
aio_context = blk_get_aio_context(data->job->blk);
- aio_context_acquire(aio_context);
+ if (aio_context != data->aio_context) {
+ aio_context_acquire(aio_context);
+ }
- data->job->deferred_to_main_loop = false;
data->fn(data->job, data->opaque);
- aio_context_release(aio_context);
+ if (aio_context != data->aio_context) {
+ aio_context_release(aio_context);
+ }
aio_context_release(data->aio_context);
aio_bh_schedule_oneshot(qemu_get_aio_context(),
block_job_defer_to_main_loop_bh, data);
}
-
-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);
-}
projects / mirror_qemu.git / blobdiff