#include "qemu/osdep.h"
#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 "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 {
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,
+};
+
+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,
+};
+
BlockJob *block_job_next(BlockJob *job)
{
if (!job) {
BlockJob *job;
QLIST_FOREACH(job, &block_jobs, job_list) {
- if (!strcmp(id, job->id)) {
+ if (job->id && !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)
{
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;
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_drain(job);
}
block_job_unref(job);
}
+void block_job_remove_all_bdrv(BlockJob *job)
+{
+ GSList *l;
+ for (l = job->nodes; l; l = l->next) {
+ BdrvChild *c = l->data;
+ bdrv_op_unblock_all(c->bs, job->blocker);
+ bdrv_root_unref_child(c);
+ }
+ g_slist_free(job->nodes);
+ job->nodes = NULL;
+}
+
+int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
+ uint64_t perm, uint64_t shared_perm, Error **errp)
+{
+ 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);
+
+ return 0;
+}
+
void *block_job_create(const char *job_id, const BlockJobDriver *driver,
- BlockDriverState *bs, int64_t speed,
+ 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;
- assert(cb);
if (bs->job) {
error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
return NULL;
}
- if (job_id == 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");
}
}
- if (!id_wellformed(job_id)) {
- error_setg(errp, "Invalid job ID '%s'", job_id);
- 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;
+ }
}
- if (block_job_get(job_id)) {
- error_setg(errp, "Job ID '%s' already in use", job_id);
+ blk = blk_new(perm, shared_perm);
+ ret = blk_insert_bs(blk, bs, errp);
+ if (ret < 0) {
+ blk_unref(blk);
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);
- 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 = true;
+ job->busy = false;
+ job->paused = true;
+ job->pause_count = 1;
job->refcnt = 1;
+
+ 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);
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,
return job;
}
+bool block_job_is_internal(BlockJob *job)
+{
+ return (job->id == NULL);
+}
+
+static bool block_job_started(BlockJob *job)
+{
+ return job->co;
+}
+
+/**
+ * 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);
+}
+
+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;
+ qemu_coroutine_enter(job->co);
+}
+
void block_job_ref(BlockJob *job)
{
++job->refcnt;
if (--job->refcnt == 0) {
BlockDriverState *bs = blk_bs(job->blk);
bs->job = NULL;
- bdrv_op_unblock_all(bs, job->blocker);
+ block_job_remove_all_bdrv(job);
blk_remove_aio_context_notifier(job->blk,
block_job_attached_aio_context,
block_job_detach_aio_context, job);
job->driver->abort(job);
}
}
- job->cb(job->opaque, job->ret);
+ if (job->driver->clean) {
+ job->driver->clean(job);
+ }
+
+ if (job->cb) {
+ job->cb(job->opaque, job->ret);
+ }
+
+ /* Emit events only if we actually started */
+ if (block_job_started(job)) {
+ 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) {
+ QLIST_REMOVE(job, txn_list);
block_job_txn_unref(job->txn);
}
block_job_unref(job);
void block_job_complete(BlockJob *job, Error **errp)
{
- if (job->pause_count || job->cancelled || !job->driver->complete) {
+ /* 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->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)
+{
+ return job ? job->user_paused : 0;
+}
+
void coroutine_fn block_job_pause_point(BlockJob *job)
{
+ assert(job && block_job_started(job));
+
if (!block_job_should_pause(job)) {
return;
}
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)
{
if (job->co && !job->busy) {
void block_job_cancel(BlockJob *job)
{
- job->cancelled = true;
- block_job_iostatus_reset(job);
- block_job_enter(job);
+ if (block_job_started(job)) {
+ job->cancelled = true;
+ block_job_iostatus_reset(job);
+ block_job_enter(job);
+ } else {
+ block_job_completed(job, -ECANCELED);
+ }
}
bool block_job_is_cancelled(BlockJob *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(block_job_get_aio_context(job), true);
+ aio_poll(qemu_get_aio_context(), true);
}
ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
block_job_unref(job);
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,
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);
/* 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);
{
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)
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