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authorPaolo Bonzini <pbonzini@redhat.com>2012-09-28 17:22:47 +0200
committerKevin Wolf <kwolf@redhat.com>2012-09-28 19:14:26 +0200
commit2f0c9fe64c6a2887047b7eab05cd85b2643234c8 (patch)
treeb51cbca0b50e9fc21482dd42a016d5ea20726144 /blockjob.c
parent7e03a9342fff50f2a6a4086906fa66e6c6d4351d (diff)
downloadqemu-arm-2f0c9fe64c6a2887047b7eab05cd85b2643234c8.tar.gz
block: move job APIs to separate files
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'blockjob.c')
-rw-r--r--blockjob.c163
1 files changed, 163 insertions, 0 deletions
diff --git a/blockjob.c b/blockjob.c
new file mode 100644
index 0000000000..9737a43b27
--- /dev/null
+++ b/blockjob.c
@@ -0,0 +1,163 @@
+/*
+ * QEMU System Emulator block driver
+ *
+ * Copyright (c) 2011 IBM Corp.
+ * Copyright (c) 2012 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "config-host.h"
+#include "qemu-common.h"
+#include "trace.h"
+#include "monitor.h"
+#include "block.h"
+#include "blockjob.h"
+#include "block_int.h"
+#include "qjson.h"
+#include "qemu-coroutine.h"
+#include "qmp-commands.h"
+#include "qemu-timer.h"
+
+void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs,
+ int64_t speed, BlockDriverCompletionFunc *cb,
+ void *opaque, Error **errp)
+{
+ BlockJob *job;
+
+ if (bs->job || bdrv_in_use(bs)) {
+ error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
+ return NULL;
+ }
+ bdrv_set_in_use(bs, 1);
+
+ job = g_malloc0(job_type->instance_size);
+ job->job_type = job_type;
+ job->bs = bs;
+ job->cb = cb;
+ job->opaque = opaque;
+ job->busy = true;
+ bs->job = 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 (error_is_set(&local_err)) {
+ bs->job = NULL;
+ g_free(job);
+ bdrv_set_in_use(bs, 0);
+ error_propagate(errp, local_err);
+ return NULL;
+ }
+ }
+ return job;
+}
+
+void block_job_complete(BlockJob *job, int ret)
+{
+ BlockDriverState *bs = job->bs;
+
+ assert(bs->job == job);
+ job->cb(job->opaque, ret);
+ bs->job = NULL;
+ g_free(job);
+ bdrv_set_in_use(bs, 0);
+}
+
+void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
+{
+ Error *local_err = NULL;
+
+ if (!job->job_type->set_speed) {
+ error_set(errp, QERR_NOT_SUPPORTED);
+ return;
+ }
+ job->job_type->set_speed(job, speed, &local_err);
+ if (error_is_set(&local_err)) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ job->speed = speed;
+}
+
+void block_job_cancel(BlockJob *job)
+{
+ job->cancelled = true;
+ if (job->co && !job->busy) {
+ qemu_coroutine_enter(job->co, NULL);
+ }
+}
+
+bool block_job_is_cancelled(BlockJob *job)
+{
+ return job->cancelled;
+}
+
+struct BlockCancelData {
+ BlockJob *job;
+ BlockDriverCompletionFunc *cb;
+ void *opaque;
+ bool cancelled;
+ int ret;
+};
+
+static void block_job_cancel_cb(void *opaque, int ret)
+{
+ struct BlockCancelData *data = opaque;
+
+ data->cancelled = block_job_is_cancelled(data->job);
+ data->ret = ret;
+ data->cb(data->opaque, ret);
+}
+
+int block_job_cancel_sync(BlockJob *job)
+{
+ struct BlockCancelData data;
+ BlockDriverState *bs = job->bs;
+
+ assert(bs->job == job);
+
+ /* 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) {
+ qemu_aio_wait();
+ }
+ return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
+}
+
+void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns)
+{
+ /* Check cancellation *before* setting busy = false, too! */
+ if (!block_job_is_cancelled(job)) {
+ job->busy = false;
+ co_sleep_ns(clock, ns);
+ job->busy = true;
+ }
+}