/* * 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/monitor.h" #include "block/block.h" #include "block/blockjob.h" #include "block/block_int.h" #include "qapi/qmp/qjson.h" #include "block/coroutine.h" #include "qmp-commands.h" #include "qemu/timer.h" void *block_job_create(const BlockJobDriver *driver, 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_ref(bs); bdrv_set_in_use(bs, 1); job = g_malloc0(driver->instance_size); job->driver = driver; 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_completed(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->driver->set_speed) { error_set(errp, QERR_NOT_SUPPORTED); return; } job->driver->set_speed(job, speed, &local_err); if (error_is_set(&local_err)) { error_propagate(errp, local_err); return; } job->speed = speed; } void block_job_complete(BlockJob *job, Error **errp) { if (job->paused || job->cancelled || !job->driver->complete) { error_set(errp, QERR_BLOCK_JOB_NOT_READY, job->bs->device_name); return; } job->driver->complete(job, errp); } void block_job_pause(BlockJob *job) { job->paused = true; } bool block_job_is_paused(BlockJob *job) { return job->paused; } void block_job_resume(BlockJob *job) { job->paused = false; block_job_iostatus_reset(job); if (job->co && !job->busy) { qemu_coroutine_enter(job->co, NULL); } } void block_job_cancel(BlockJob *job) { job->cancelled = true; block_job_resume(job); } bool block_job_is_cancelled(BlockJob *job) { return job->cancelled; } void block_job_iostatus_reset(BlockJob *job) { job->iostatus = BLOCK_DEVICE_IO_STATUS_OK; if (job->driver->iostatus_reset) { job->driver->iostatus_reset(job); } } 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, QEMUClockType type, int64_t ns) { assert(job->busy); /* Check cancellation *before* setting busy = false, too! */ if (block_job_is_cancelled(job)) { return; } job->busy = false; if (block_job_is_paused(job)) { qemu_coroutine_yield(); } else { co_sleep_ns(type, ns); } job->busy = true; } BlockJobInfo *block_job_query(BlockJob *job) { BlockJobInfo *info = g_new0(BlockJobInfo, 1); info->type = g_strdup(job->driver->job_type); info->device = g_strdup(bdrv_get_device_name(job->bs)); info->len = job->len; info->busy = job->busy; info->paused = job->paused; info->offset = job->offset; info->speed = job->speed; info->io_status = job->iostatus; return info; } static void block_job_iostatus_set_err(BlockJob *job, int error) { if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : BLOCK_DEVICE_IO_STATUS_FAILED; } } QObject *qobject_from_block_job(BlockJob *job) { return qobject_from_jsonf("{ 'type': %s," "'device': %s," "'len': %" PRId64 "," "'offset': %" PRId64 "," "'speed': %" PRId64 " }", job->driver->job_type, bdrv_get_device_name(job->bs), job->len, job->offset, job->speed); } void block_job_ready(BlockJob *job) { QObject *data = qobject_from_block_job(job); monitor_protocol_event(QEVENT_BLOCK_JOB_READY, data); qobject_decref(data); } BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs, BlockdevOnError on_err, int is_read, int error) { BlockErrorAction action; switch (on_err) { case BLOCKDEV_ON_ERROR_ENOSPC: action = (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; break; case BLOCKDEV_ON_ERROR_STOP: action = BDRV_ACTION_STOP; break; case BLOCKDEV_ON_ERROR_REPORT: action = BDRV_ACTION_REPORT; break; case BLOCKDEV_ON_ERROR_IGNORE: action = BDRV_ACTION_IGNORE; break; default: abort(); } bdrv_emit_qmp_error_event(job->bs, QEVENT_BLOCK_JOB_ERROR, action, is_read); if (action == BDRV_ACTION_STOP) { block_job_pause(job); block_job_iostatus_set_err(job, error); if (bs != job->bs) { bdrv_iostatus_set_err(bs, error); } } return action; }