mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 01:43:39 +00:00
164 lines
4.4 KiB
C
164 lines
4.4 KiB
C
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/*
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2011 IBM Corp.
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* Copyright (c) 2012 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config-host.h"
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#include "qemu-common.h"
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#include "trace.h"
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#include "monitor.h"
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#include "block.h"
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#include "blockjob.h"
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#include "block_int.h"
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#include "qjson.h"
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#include "qemu-coroutine.h"
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#include "qmp-commands.h"
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#include "qemu-timer.h"
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void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs,
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int64_t speed, BlockDriverCompletionFunc *cb,
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void *opaque, Error **errp)
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{
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BlockJob *job;
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if (bs->job || bdrv_in_use(bs)) {
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error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
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return NULL;
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}
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bdrv_set_in_use(bs, 1);
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job = g_malloc0(job_type->instance_size);
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job->job_type = job_type;
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job->bs = bs;
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job->cb = cb;
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job->opaque = opaque;
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job->busy = true;
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bs->job = job;
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/* Only set speed when necessary to avoid NotSupported error */
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if (speed != 0) {
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Error *local_err = NULL;
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block_job_set_speed(job, speed, &local_err);
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if (error_is_set(&local_err)) {
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bs->job = NULL;
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g_free(job);
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bdrv_set_in_use(bs, 0);
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error_propagate(errp, local_err);
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return NULL;
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}
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}
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return job;
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}
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void block_job_complete(BlockJob *job, int ret)
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{
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BlockDriverState *bs = job->bs;
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assert(bs->job == job);
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job->cb(job->opaque, ret);
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bs->job = NULL;
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g_free(job);
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bdrv_set_in_use(bs, 0);
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}
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void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
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{
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Error *local_err = NULL;
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if (!job->job_type->set_speed) {
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error_set(errp, QERR_NOT_SUPPORTED);
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return;
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}
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job->job_type->set_speed(job, speed, &local_err);
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if (error_is_set(&local_err)) {
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error_propagate(errp, local_err);
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return;
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}
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job->speed = speed;
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}
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void block_job_cancel(BlockJob *job)
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{
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job->cancelled = true;
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if (job->co && !job->busy) {
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qemu_coroutine_enter(job->co, NULL);
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}
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}
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bool block_job_is_cancelled(BlockJob *job)
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{
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return job->cancelled;
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}
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struct BlockCancelData {
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BlockJob *job;
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BlockDriverCompletionFunc *cb;
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void *opaque;
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bool cancelled;
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int ret;
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};
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static void block_job_cancel_cb(void *opaque, int ret)
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{
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struct BlockCancelData *data = opaque;
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data->cancelled = block_job_is_cancelled(data->job);
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data->ret = ret;
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data->cb(data->opaque, ret);
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}
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int block_job_cancel_sync(BlockJob *job)
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{
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struct BlockCancelData data;
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BlockDriverState *bs = job->bs;
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assert(bs->job == job);
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/* Set up our own callback to store the result and chain to
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* the original callback.
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*/
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data.job = job;
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data.cb = job->cb;
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data.opaque = job->opaque;
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data.ret = -EINPROGRESS;
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job->cb = block_job_cancel_cb;
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job->opaque = &data;
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block_job_cancel(job);
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while (data.ret == -EINPROGRESS) {
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qemu_aio_wait();
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}
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return (data.cancelled && data.ret == 0) ? -ECANCELED : data.ret;
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}
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void block_job_sleep_ns(BlockJob *job, QEMUClock *clock, int64_t ns)
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{
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/* Check cancellation *before* setting busy = false, too! */
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if (!block_job_is_cancelled(job)) {
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job->busy = false;
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co_sleep_ns(clock, ns);
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job->busy = true;
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}
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}
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