root / blockjob.c @ 737e150e
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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/block.h" |
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#include "block/blockjob.h" |
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#include "block/block_int.h" |
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#include "qapi/qmp/qjson.h" |
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#include "block/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_completed(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_complete(BlockJob *job, Error **errp)
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{ |
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if (job->paused || job->cancelled || !job->job_type->complete) {
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error_set(errp, QERR_BLOCK_JOB_NOT_READY, job->bs->device_name); |
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return;
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} |
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job->job_type->complete(job, errp); |
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} |
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void block_job_pause(BlockJob *job)
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{ |
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job->paused = true;
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} |
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bool block_job_is_paused(BlockJob *job)
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{ |
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return job->paused;
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} |
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void block_job_resume(BlockJob *job)
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{ |
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job->paused = false;
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block_job_iostatus_reset(job); |
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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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void block_job_cancel(BlockJob *job)
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{ |
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job->cancelled = true;
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block_job_resume(job); |
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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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void block_job_iostatus_reset(BlockJob *job)
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{ |
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job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
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if (job->job_type->iostatus_reset) {
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job->job_type->iostatus_reset(job); |
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} |
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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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assert(job->busy); |
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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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return;
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} |
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job->busy = false;
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if (block_job_is_paused(job)) {
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qemu_coroutine_yield(); |
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} else {
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co_sleep_ns(clock, ns); |
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} |
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job->busy = true;
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} |
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BlockJobInfo *block_job_query(BlockJob *job) |
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{ |
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BlockJobInfo *info = g_new0(BlockJobInfo, 1);
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info->type = g_strdup(job->job_type->job_type); |
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info->device = g_strdup(bdrv_get_device_name(job->bs)); |
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info->len = job->len; |
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info->busy = job->busy; |
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info->paused = job->paused; |
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info->offset = job->offset; |
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info->speed = job->speed; |
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info->io_status = job->iostatus; |
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return info;
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} |
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static void block_job_iostatus_set_err(BlockJob *job, int error) |
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{ |
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if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
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job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
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BLOCK_DEVICE_IO_STATUS_FAILED; |
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} |
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} |
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QObject *qobject_from_block_job(BlockJob *job) |
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{ |
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return qobject_from_jsonf("{ 'type': %s," |
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"'device': %s,"
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"'len': %" PRId64 "," |
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"'offset': %" PRId64 "," |
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"'speed': %" PRId64 " }", |
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job->job_type->job_type, |
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bdrv_get_device_name(job->bs), |
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job->len, |
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job->offset, |
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job->speed); |
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} |
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void block_job_ready(BlockJob *job)
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{ |
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QObject *data = qobject_from_block_job(job); |
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monitor_protocol_event(QEVENT_BLOCK_JOB_READY, data); |
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qobject_decref(data); |
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} |
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BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs, |
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BlockdevOnError on_err, |
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int is_read, int error) |
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{ |
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BlockErrorAction action; |
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switch (on_err) {
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case BLOCKDEV_ON_ERROR_ENOSPC:
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action = (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; |
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break;
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case BLOCKDEV_ON_ERROR_STOP:
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action = BDRV_ACTION_STOP; |
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break;
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case BLOCKDEV_ON_ERROR_REPORT:
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action = BDRV_ACTION_REPORT; |
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break;
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case BLOCKDEV_ON_ERROR_IGNORE:
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action = BDRV_ACTION_IGNORE; |
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break;
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default:
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abort(); |
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} |
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bdrv_emit_qmp_error_event(job->bs, QEVENT_BLOCK_JOB_ERROR, action, is_read); |
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if (action == BDRV_ACTION_STOP) {
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block_job_pause(job); |
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block_job_iostatus_set_err(job, error); |
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if (bs != job->bs) {
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bdrv_iostatus_set_err(bs, error); |
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} |
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} |
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return action;
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} |