* THE SOFTWARE.
*/
-#include "config-host.h"
+#include "qemu/osdep.h"
#include "qemu-common.h"
#include "trace.h"
#include "block/block.h"
#include "block/blockjob.h"
#include "block/block_int.h"
+#include "sysemu/block-backend.h"
+#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qjson.h"
-#include "block/coroutine.h"
+#include "qemu/coroutine.h"
+#include "qemu/id.h"
#include "qmp-commands.h"
#include "qemu/timer.h"
#include "qapi-event.h"
-void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
- int64_t speed, BlockCompletionFunc *cb,
- void *opaque, Error **errp)
+/* 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;
+};
+
+static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs);
+
+BlockJob *block_job_next(BlockJob *job)
+{
+ if (!job) {
+ return QLIST_FIRST(&block_jobs);
+ }
+ return QLIST_NEXT(job, job_list);
+}
+
+BlockJob *block_job_get(const char *id)
{
BlockJob *job;
+ QLIST_FOREACH(job, &block_jobs, job_list) {
+ if (!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)
+{
+ 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_detach_aio_context(void *opaque)
+{
+ BlockJob *job = opaque;
+
+ /* In case the job terminates during aio_poll()... */
+ block_job_ref(job);
+
+ 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_unref(job);
+}
+
+void *block_job_create(const char *job_id, const BlockJobDriver *driver,
+ BlockDriverState *bs, int64_t speed,
+ BlockCompletionFunc *cb, void *opaque, Error **errp)
+{
+ BlockBackend *blk;
+ BlockJob *job;
+
+ assert(cb);
if (bs->job) {
- error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
+ error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
+ return NULL;
+ }
+
+ if (job_id == NULL) {
+ job_id = bdrv_get_device_name(bs);
+ }
+
+ if (!id_wellformed(job_id)) {
+ error_setg(errp, "Invalid job ID '%s'", job_id);
return NULL;
}
- bdrv_ref(bs);
+
+ 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);
+ bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
job->driver = driver;
- job->bs = bs;
+ job->id = g_strdup(job_id);
+ job->blk = blk;
job->cb = cb;
job->opaque = opaque;
job->busy = true;
+ 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) {
- bs->job = NULL;
- bdrv_op_unblock_all(bs, job->blocker);
- error_free(job->blocker);
- g_free(job);
+ block_job_unref(job);
error_propagate(errp, local_err);
return NULL;
}
return job;
}
-void block_job_completed(BlockJob *job, int ret)
+void block_job_ref(BlockJob *job)
+{
+ ++job->refcnt;
+}
+
+void block_job_unref(BlockJob *job)
+{
+ if (--job->refcnt == 0) {
+ BlockDriverState *bs = blk_bs(job->blk);
+ bs->job = NULL;
+ bdrv_op_unblock_all(bs, job->blocker);
+ 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);
+ }
+}
+
+static void block_job_completed_single(BlockJob *job)
+{
+ if (!job->ret) {
+ if (job->driver->commit) {
+ job->driver->commit(job);
+ }
+ } else {
+ if (job->driver->abort) {
+ job->driver->abort(job);
+ }
+ }
+ job->cb(job->opaque, job->ret);
+ if (job->txn) {
+ block_job_txn_unref(job->txn);
+ }
+ block_job_unref(job);
+}
+
+static void block_job_completed_txn_abort(BlockJob *job)
{
- BlockDriverState *bs = job->bs;
+ 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);
+ }
+ 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);
+ }
+ QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
+ ctx = blk_get_aio_context(other_job->blk);
+ block_job_completed_single(other_job);
+ aio_context_release(ctx);
+ }
+}
- assert(bs->job == job);
- job->cb(job->opaque, ret);
- bs->job = NULL;
- bdrv_op_unblock_all(bs, job->blocker);
- error_free(job->blocker);
- g_free(job);
+static void block_job_completed_txn_success(BlockJob *job)
+{
+ AioContext *ctx;
+ BlockJobTxn *txn = job->txn;
+ BlockJob *other_job, *next;
+ /*
+ * 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;
+ }
+ }
+ /* 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_completed(BlockJob *job, int ret)
+{
+ assert(blk_bs(job->blk)->job == job);
+ assert(!job->completed);
+ job->completed = true;
+ job->ret = ret;
+ if (!job->txn) {
+ block_job_completed_single(job);
+ } else if (ret < 0 || block_job_is_cancelled(job)) {
+ block_job_completed_txn_abort(job);
+ } else {
+ block_job_completed_txn_success(job);
+ }
}
void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
Error *local_err = NULL;
if (!job->driver->set_speed) {
- error_set(errp, QERR_UNSUPPORTED);
+ error_setg(errp, QERR_UNSUPPORTED);
return;
}
job->driver->set_speed(job, speed, &local_err);
void block_job_complete(BlockJob *job, Error **errp)
{
- if (job->paused || job->cancelled || !job->driver->complete) {
- error_set(errp, QERR_BLOCK_JOB_NOT_READY,
- bdrv_get_device_name(job->bs));
+ if (job->pause_count || job->cancelled || !job->driver->complete) {
+ error_setg(errp, "The active block job '%s' cannot be completed",
+ job->id);
return;
}
void block_job_pause(BlockJob *job)
{
- job->paused = true;
+ job->pause_count++;
}
-bool block_job_is_paused(BlockJob *job)
+static bool block_job_should_pause(BlockJob *job)
{
- return job->paused;
+ return job->pause_count > 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)
{
- job->paused = false;
- block_job_iostatus_reset(job);
+ assert(job->pause_count > 0);
+ job->pause_count--;
+ if (job->pause_count) {
+ return;
+ }
+ block_job_enter(job);
+}
+
+void block_job_enter(BlockJob *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_resume(job);
+ block_job_iostatus_reset(job);
+ block_job_enter(job);
}
bool block_job_is_cancelled(BlockJob *job)
}
}
-struct BlockCancelData {
- BlockJob *job;
- BlockCompletionFunc *cb;
- void *opaque;
- bool cancelled;
+static int block_job_finish_sync(BlockJob *job,
+ void (*finish)(BlockJob *, Error **errp),
+ Error **errp)
+{
+ Error *local_err = NULL;
int ret;
-};
-static void block_job_cancel_cb(void *opaque, int ret)
-{
- struct BlockCancelData *data = opaque;
+ assert(blk_bs(job->blk)->job == job);
- data->cancelled = block_job_is_cancelled(data->job);
- data->ret = ret;
- data->cb(data->opaque, ret);
+ block_job_ref(job);
+ finish(job, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ block_job_unref(job);
+ return -EBUSY;
+ }
+ while (!job->completed) {
+ aio_poll(block_job_get_aio_context(job), true);
+ }
+ 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)
{
- struct BlockCancelData data;
- BlockDriverState *bs = job->bs;
+ return block_job_finish_sync(job, &block_job_cancel_err, NULL);
+}
- assert(bs->job == job);
+void block_job_cancel_sync_all(void)
+{
+ BlockJob *job;
+ AioContext *aio_context;
- /* Set up our own callback to store the result and chain to
- * the original callback.
- */
- data.job = job;
- data.cb = job->cb;
- data.opaque = job->opaque;
- data.ret = -EINPROGRESS;
- job->cb = block_job_cancel_cb;
- job->opaque = &data;
- block_job_cancel(job);
- while (data.ret == -EINPROGRESS) {
- aio_poll(bdrv_get_aio_context(bs), true);
+ 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);
}
- return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
+}
+
+int block_job_complete_sync(BlockJob *job, Error **errp)
+{
+ return block_job_finish_sync(job, &block_job_complete, errp);
}
void block_job_sleep_ns(BlockJob *job, QEMUClockType type, int64_t ns)
}
job->busy = false;
- if (block_job_is_paused(job)) {
- qemu_coroutine_yield();
- } else {
- co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
+ 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 *info = g_new0(BlockJobInfo, 1);
info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]);
- info->device = g_strdup(bdrv_get_device_name(job->bs));
+ info->device = g_strdup(job->id);
info->len = job->len;
info->busy = job->busy;
- info->paused = job->paused;
+ 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;
}
void block_job_event_cancelled(BlockJob *job)
{
qapi_event_send_block_job_cancelled(job->driver->job_type,
- bdrv_get_device_name(job->bs),
+ job->id,
job->len,
job->offset,
job->speed,
void block_job_event_completed(BlockJob *job, const char *msg)
{
qapi_event_send_block_job_completed(job->driver->job_type,
- bdrv_get_device_name(job->bs),
+ job->id,
job->len,
job->offset,
job->speed,
void block_job_event_ready(BlockJob *job)
{
+ job->ready = true;
+
qapi_event_send_block_job_ready(job->driver->job_type,
- bdrv_get_device_name(job->bs),
+ job->id,
job->len,
job->offset,
job->speed, &error_abort);
}
-BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs,
- BlockdevOnError on_err,
+BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
int is_read, int error)
{
BlockErrorAction action;
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(bdrv_get_device_name(job->bs),
+ 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_iostatus_set_err(job, error);
- if (bs != job->bs) {
- bdrv_iostatus_set_err(bs, error);
- }
}
return action;
}
+
+typedef struct {
+ BlockJob *job;
+ QEMUBH *bh;
+ 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;
+
+ 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);
+
+ data->job->deferred_to_main_loop = false;
+ data->fn(data->job, data->opaque);
+
+ 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->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);
+}
+
+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