* THE SOFTWARE.
*/
-#include "config-host.h"
+#include "qemu/osdep.h"
#include "qemu-common.h"
#include "trace.h"
#include "block/block.h"
#include "qemu/timer.h"
#include "qapi-event.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;
+};
+
+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);
+}
+
void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
int64_t speed, BlockCompletionFunc *cb,
void *opaque, Error **errp)
{
+ BlockBackend *blk;
BlockJob *job;
if (bs->job) {
error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
return NULL;
}
- bdrv_ref(bs);
+
+ 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]);
job->driver = driver;
job->id = g_strdup(bdrv_get_device_name(bs));
- job->bs = bs;
+ 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);
+
/* Only set speed when necessary to avoid NotSupported error */
if (speed != 0) {
Error *local_err = NULL;
void block_job_unref(BlockJob *job)
{
if (--job->refcnt == 0) {
- job->bs->job = NULL;
- bdrv_op_unblock_all(job->bs, job->blocker);
- bdrv_unref(job->bs);
+ BlockDriverState *bs = blk_bs(job->blk);
+ bs->job = NULL;
+ bdrv_op_unblock_all(bs, job->blocker);
+ blk_unref(job->blk);
error_free(job->blocker);
g_free(job->id);
+ QLIST_REMOVE(job, job_list);
g_free(job);
}
}
-void block_job_completed(BlockJob *job, int ret)
+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)
+{
+ 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);
+ }
+}
+
+static void block_job_completed_txn_success(BlockJob *job)
{
- BlockDriverState *bs = job->bs;
+ 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);
+ }
+}
- assert(bs->job == job);
+void block_job_completed(BlockJob *job, int ret)
+{
+ assert(blk_bs(job->blk)->job == job);
assert(!job->completed);
job->completed = true;
job->ret = ret;
- job->cb(job->opaque, ret);
- block_job_unref(job);
+ 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)
}
}
-struct BlockFinishData {
- BlockJob *job;
- BlockCompletionFunc *cb;
- void *opaque;
- bool cancelled;
- int ret;
-};
-
static int block_job_finish_sync(BlockJob *job,
void (*finish)(BlockJob *, Error **errp),
Error **errp)
{
- BlockDriverState *bs = job->bs;
Error *local_err = NULL;
int ret;
- assert(bs->job == job);
+ assert(blk_bs(job->blk)->job == job);
block_job_ref(job);
finish(job, &local_err);
return -EBUSY;
}
while (!job->completed) {
- aio_poll(bdrv_get_aio_context(bs), true);
+ aio_poll(job->deferred_to_main_loop ? qemu_get_aio_context() :
+ blk_get_aio_context(job->blk),
+ true);
}
ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
block_job_unref(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);
if (block_job_is_paused(job)) {
qemu_coroutine_yield();
} else {
- co_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
+ co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns);
}
job->busy = true;
}
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;
job->user_paused = true;
block_job_pause(job);
block_job_iostatus_set_err(job, error);
- if (bs->blk && bs != job->bs) {
- blk_iostatus_set_err(bs->blk, error);
- }
}
return action;
}
aio_context_acquire(data->aio_context);
/* Fetch BDS AioContext again, in case it has changed */
- aio_context = bdrv_get_aio_context(data->job->bs);
+ 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);
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 = bdrv_get_aio_context(job->bs);
+ 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 / qemu.git / blobdiff