782 lines
20 KiB
C
782 lines
20 KiB
C
/*
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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 "qemu/osdep.h"
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#include "qemu-common.h"
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#include "trace.h"
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#include "block/block.h"
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#include "block/blockjob_int.h"
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#include "block/block_int.h"
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#include "sysemu/block-backend.h"
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#include "qapi/qmp/qerror.h"
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#include "qapi/qmp/qjson.h"
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#include "qemu/coroutine.h"
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#include "qemu/id.h"
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#include "qmp-commands.h"
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#include "qemu/timer.h"
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#include "qapi-event.h"
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static void block_job_event_cancelled(BlockJob *job);
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static void block_job_event_completed(BlockJob *job, const char *msg);
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/* Transactional group of block jobs */
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struct BlockJobTxn {
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/* Is this txn being cancelled? */
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bool aborting;
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/* List of jobs */
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QLIST_HEAD(, BlockJob) jobs;
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/* Reference count */
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int refcnt;
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};
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static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs);
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BlockJob *block_job_next(BlockJob *job)
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{
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if (!job) {
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return QLIST_FIRST(&block_jobs);
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}
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return QLIST_NEXT(job, job_list);
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}
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BlockJob *block_job_get(const char *id)
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{
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BlockJob *job;
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QLIST_FOREACH(job, &block_jobs, job_list) {
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if (job->id && !strcmp(id, job->id)) {
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return job;
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}
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}
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return NULL;
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}
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static void block_job_attached_aio_context(AioContext *new_context,
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void *opaque)
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{
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BlockJob *job = opaque;
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if (job->driver->attached_aio_context) {
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job->driver->attached_aio_context(job, new_context);
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}
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block_job_resume(job);
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}
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static void block_job_drain(BlockJob *job)
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{
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/* If job is !job->busy this kicks it into the next pause point. */
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block_job_enter(job);
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blk_drain(job->blk);
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if (job->driver->drain) {
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job->driver->drain(job);
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}
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}
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static void block_job_detach_aio_context(void *opaque)
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{
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BlockJob *job = opaque;
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/* In case the job terminates during aio_poll()... */
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block_job_ref(job);
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block_job_pause(job);
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while (!job->paused && !job->completed) {
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block_job_drain(job);
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}
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block_job_unref(job);
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}
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void block_job_add_bdrv(BlockJob *job, BlockDriverState *bs)
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{
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job->nodes = g_slist_prepend(job->nodes, bs);
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bdrv_ref(bs);
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bdrv_op_block_all(bs, job->blocker);
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}
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void *block_job_create(const char *job_id, const BlockJobDriver *driver,
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BlockDriverState *bs, int64_t speed, int flags,
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BlockCompletionFunc *cb, void *opaque, Error **errp)
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{
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BlockBackend *blk;
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BlockJob *job;
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if (bs->job) {
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error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
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return NULL;
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}
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if (job_id == NULL && !(flags & BLOCK_JOB_INTERNAL)) {
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job_id = bdrv_get_device_name(bs);
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if (!*job_id) {
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error_setg(errp, "An explicit job ID is required for this node");
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return NULL;
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}
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}
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if (job_id) {
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if (flags & BLOCK_JOB_INTERNAL) {
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error_setg(errp, "Cannot specify job ID for internal block job");
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return NULL;
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}
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if (!id_wellformed(job_id)) {
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error_setg(errp, "Invalid job ID '%s'", job_id);
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return NULL;
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}
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if (block_job_get(job_id)) {
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error_setg(errp, "Job ID '%s' already in use", job_id);
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return NULL;
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}
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}
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blk = blk_new();
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blk_insert_bs(blk, bs);
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job = g_malloc0(driver->instance_size);
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error_setg(&job->blocker, "block device is in use by block job: %s",
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BlockJobType_lookup[driver->job_type]);
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block_job_add_bdrv(job, bs);
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bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
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job->driver = driver;
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job->id = g_strdup(job_id);
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job->blk = blk;
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job->cb = cb;
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job->opaque = opaque;
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job->busy = false;
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job->paused = true;
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job->pause_count = 1;
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job->refcnt = 1;
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bs->job = job;
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QLIST_INSERT_HEAD(&block_jobs, job, job_list);
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blk_add_aio_context_notifier(blk, block_job_attached_aio_context,
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block_job_detach_aio_context, 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 (local_err) {
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block_job_unref(job);
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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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bool block_job_is_internal(BlockJob *job)
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{
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return (job->id == NULL);
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}
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static bool block_job_started(BlockJob *job)
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{
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return job->co;
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}
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void block_job_start(BlockJob *job)
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{
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assert(job && !block_job_started(job) && job->paused &&
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!job->busy && job->driver->start);
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job->co = qemu_coroutine_create(job->driver->start, job);
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if (--job->pause_count == 0) {
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job->paused = false;
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job->busy = true;
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qemu_coroutine_enter(job->co);
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}
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}
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void block_job_ref(BlockJob *job)
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{
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++job->refcnt;
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}
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void block_job_unref(BlockJob *job)
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{
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if (--job->refcnt == 0) {
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GSList *l;
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BlockDriverState *bs = blk_bs(job->blk);
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bs->job = NULL;
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for (l = job->nodes; l; l = l->next) {
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bs = l->data;
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bdrv_op_unblock_all(bs, job->blocker);
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bdrv_unref(bs);
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}
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g_slist_free(job->nodes);
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blk_remove_aio_context_notifier(job->blk,
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block_job_attached_aio_context,
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block_job_detach_aio_context, job);
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blk_unref(job->blk);
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error_free(job->blocker);
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g_free(job->id);
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QLIST_REMOVE(job, job_list);
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g_free(job);
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}
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}
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static void block_job_completed_single(BlockJob *job)
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{
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if (!job->ret) {
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if (job->driver->commit) {
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job->driver->commit(job);
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}
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} else {
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if (job->driver->abort) {
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job->driver->abort(job);
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}
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}
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if (job->driver->clean) {
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job->driver->clean(job);
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}
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if (job->cb) {
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job->cb(job->opaque, job->ret);
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}
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/* Emit events only if we actually started */
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if (block_job_started(job)) {
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if (block_job_is_cancelled(job)) {
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block_job_event_cancelled(job);
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} else {
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const char *msg = NULL;
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if (job->ret < 0) {
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msg = strerror(-job->ret);
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}
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block_job_event_completed(job, msg);
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}
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}
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if (job->txn) {
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QLIST_REMOVE(job, txn_list);
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block_job_txn_unref(job->txn);
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}
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block_job_unref(job);
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}
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static void block_job_completed_txn_abort(BlockJob *job)
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{
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AioContext *ctx;
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BlockJobTxn *txn = job->txn;
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BlockJob *other_job, *next;
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if (txn->aborting) {
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/*
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* We are cancelled by another job, which will handle everything.
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*/
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return;
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}
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txn->aborting = true;
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/* We are the first failed job. Cancel other jobs. */
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QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
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ctx = blk_get_aio_context(other_job->blk);
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aio_context_acquire(ctx);
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}
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QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
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if (other_job == job || other_job->completed) {
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/* Other jobs are "effectively" cancelled by us, set the status for
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* them; this job, however, may or may not be cancelled, depending
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* on the caller, so leave it. */
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if (other_job != job) {
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other_job->cancelled = true;
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}
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continue;
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}
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block_job_cancel_sync(other_job);
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assert(other_job->completed);
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}
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QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
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ctx = blk_get_aio_context(other_job->blk);
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block_job_completed_single(other_job);
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aio_context_release(ctx);
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}
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}
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static void block_job_completed_txn_success(BlockJob *job)
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{
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AioContext *ctx;
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BlockJobTxn *txn = job->txn;
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BlockJob *other_job, *next;
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/*
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* Successful completion, see if there are other running jobs in this
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* txn.
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*/
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QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
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if (!other_job->completed) {
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return;
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}
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}
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/* We are the last completed job, commit the transaction. */
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QLIST_FOREACH_SAFE(other_job, &txn->jobs, txn_list, next) {
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ctx = blk_get_aio_context(other_job->blk);
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aio_context_acquire(ctx);
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assert(other_job->ret == 0);
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block_job_completed_single(other_job);
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aio_context_release(ctx);
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}
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}
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void block_job_completed(BlockJob *job, int ret)
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{
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assert(blk_bs(job->blk)->job == job);
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assert(!job->completed);
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job->completed = true;
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job->ret = ret;
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if (!job->txn) {
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block_job_completed_single(job);
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} else if (ret < 0 || block_job_is_cancelled(job)) {
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block_job_completed_txn_abort(job);
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} else {
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block_job_completed_txn_success(job);
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}
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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->driver->set_speed) {
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error_setg(errp, QERR_UNSUPPORTED);
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return;
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}
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job->driver->set_speed(job, speed, &local_err);
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if (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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/* Should not be reachable via external interface for internal jobs */
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assert(job->id);
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if (job->pause_count || job->cancelled ||
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!block_job_started(job) || !job->driver->complete) {
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error_setg(errp, "The active block job '%s' cannot be completed",
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job->id);
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return;
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}
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job->driver->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->pause_count++;
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}
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void block_job_user_pause(BlockJob *job)
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{
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job->user_paused = true;
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block_job_pause(job);
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}
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static bool block_job_should_pause(BlockJob *job)
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{
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return job->pause_count > 0;
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}
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bool block_job_user_paused(BlockJob *job)
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{
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return job ? job->user_paused : 0;
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}
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void coroutine_fn block_job_pause_point(BlockJob *job)
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{
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assert(job && block_job_started(job));
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if (!block_job_should_pause(job)) {
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return;
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}
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if (block_job_is_cancelled(job)) {
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return;
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}
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if (job->driver->pause) {
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job->driver->pause(job);
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}
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if (block_job_should_pause(job) && !block_job_is_cancelled(job)) {
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job->paused = true;
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job->busy = false;
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qemu_coroutine_yield(); /* wait for block_job_resume() */
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job->busy = true;
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job->paused = false;
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}
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if (job->driver->resume) {
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job->driver->resume(job);
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}
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}
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void block_job_resume(BlockJob *job)
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{
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assert(job->pause_count > 0);
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job->pause_count--;
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if (job->pause_count) {
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return;
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}
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block_job_enter(job);
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}
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void block_job_user_resume(BlockJob *job)
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{
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if (job && job->user_paused && job->pause_count > 0) {
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job->user_paused = false;
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block_job_resume(job);
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}
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}
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void block_job_enter(BlockJob *job)
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{
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if (job->co && !job->busy) {
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qemu_coroutine_enter(job->co);
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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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if (block_job_started(job)) {
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job->cancelled = true;
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block_job_iostatus_reset(job);
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block_job_enter(job);
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} else {
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block_job_completed(job, -ECANCELED);
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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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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->driver->iostatus_reset) {
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job->driver->iostatus_reset(job);
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}
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}
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static int block_job_finish_sync(BlockJob *job,
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void (*finish)(BlockJob *, Error **errp),
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Error **errp)
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{
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Error *local_err = NULL;
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int ret;
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assert(blk_bs(job->blk)->job == job);
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block_job_ref(job);
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finish(job, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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block_job_unref(job);
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return -EBUSY;
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}
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/* block_job_drain calls block_job_enter, and it should be enough to
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* induce progress until the job completes or moves to the main thread.
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*/
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while (!job->deferred_to_main_loop && !job->completed) {
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block_job_drain(job);
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}
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while (!job->completed) {
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aio_poll(qemu_get_aio_context(), true);
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}
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ret = (job->cancelled && job->ret == 0) ? -ECANCELED : job->ret;
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block_job_unref(job);
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return ret;
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}
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/* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
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* used with block_job_finish_sync() without the need for (rather nasty)
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* function pointer casts there. */
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static void block_job_cancel_err(BlockJob *job, Error **errp)
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{
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block_job_cancel(job);
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}
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int block_job_cancel_sync(BlockJob *job)
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{
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return block_job_finish_sync(job, &block_job_cancel_err, NULL);
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}
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void block_job_cancel_sync_all(void)
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|
{
|
|
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);
|
|
}
|
|
|
|
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_should_pause(job)) {
|
|
co_aio_sleep_ns(blk_get_aio_context(job->blk), type, ns);
|
|
}
|
|
job->busy = true;
|
|
|
|
block_job_pause_point(job);
|
|
}
|
|
|
|
void block_job_yield(BlockJob *job)
|
|
{
|
|
assert(job->busy);
|
|
|
|
/* Check cancellation *before* setting busy = false, too! */
|
|
if (block_job_is_cancelled(job)) {
|
|
return;
|
|
}
|
|
|
|
job->busy = false;
|
|
if (!block_job_should_pause(job)) {
|
|
qemu_coroutine_yield();
|
|
}
|
|
job->busy = true;
|
|
|
|
block_job_pause_point(job);
|
|
}
|
|
|
|
BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
|
|
{
|
|
BlockJobInfo *info;
|
|
|
|
if (block_job_is_internal(job)) {
|
|
error_setg(errp, "Cannot query QEMU internal jobs");
|
|
return NULL;
|
|
}
|
|
info = g_new0(BlockJobInfo, 1);
|
|
info->type = g_strdup(BlockJobType_lookup[job->driver->job_type]);
|
|
info->device = g_strdup(job->id);
|
|
info->len = job->len;
|
|
info->busy = job->busy;
|
|
info->paused = job->pause_count > 0;
|
|
info->offset = job->offset;
|
|
info->speed = job->speed;
|
|
info->io_status = job->iostatus;
|
|
info->ready = job->ready;
|
|
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;
|
|
}
|
|
}
|
|
|
|
static void block_job_event_cancelled(BlockJob *job)
|
|
{
|
|
if (block_job_is_internal(job)) {
|
|
return;
|
|
}
|
|
|
|
qapi_event_send_block_job_cancelled(job->driver->job_type,
|
|
job->id,
|
|
job->len,
|
|
job->offset,
|
|
job->speed,
|
|
&error_abort);
|
|
}
|
|
|
|
static void block_job_event_completed(BlockJob *job, const char *msg)
|
|
{
|
|
if (block_job_is_internal(job)) {
|
|
return;
|
|
}
|
|
|
|
qapi_event_send_block_job_completed(job->driver->job_type,
|
|
job->id,
|
|
job->len,
|
|
job->offset,
|
|
job->speed,
|
|
!!msg,
|
|
msg,
|
|
&error_abort);
|
|
}
|
|
|
|
void block_job_event_ready(BlockJob *job)
|
|
{
|
|
job->ready = true;
|
|
|
|
if (block_job_is_internal(job)) {
|
|
return;
|
|
}
|
|
|
|
qapi_event_send_block_job_ready(job->driver->job_type,
|
|
job->id,
|
|
job->len,
|
|
job->offset,
|
|
job->speed, &error_abort);
|
|
}
|
|
|
|
BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
|
|
int is_read, int error)
|
|
{
|
|
BlockErrorAction action;
|
|
|
|
switch (on_err) {
|
|
case BLOCKDEV_ON_ERROR_ENOSPC:
|
|
case BLOCKDEV_ON_ERROR_AUTO:
|
|
action = (error == ENOSPC) ?
|
|
BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
|
|
break;
|
|
case BLOCKDEV_ON_ERROR_STOP:
|
|
action = BLOCK_ERROR_ACTION_STOP;
|
|
break;
|
|
case BLOCKDEV_ON_ERROR_REPORT:
|
|
action = BLOCK_ERROR_ACTION_REPORT;
|
|
break;
|
|
case BLOCKDEV_ON_ERROR_IGNORE:
|
|
action = BLOCK_ERROR_ACTION_IGNORE;
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
if (!block_job_is_internal(job)) {
|
|
qapi_event_send_block_job_error(job->id,
|
|
is_read ? IO_OPERATION_TYPE_READ :
|
|
IO_OPERATION_TYPE_WRITE,
|
|
action, &error_abort);
|
|
}
|
|
if (action == BLOCK_ERROR_ACTION_STOP) {
|
|
/* make the pause user visible, which will be resumed from QMP. */
|
|
block_job_user_pause(job);
|
|
block_job_iostatus_set_err(job, error);
|
|
}
|
|
return action;
|
|
}
|
|
|
|
typedef struct {
|
|
BlockJob *job;
|
|
AioContext *aio_context;
|
|
BlockJobDeferToMainLoopFn *fn;
|
|
void *opaque;
|
|
} BlockJobDeferToMainLoopData;
|
|
|
|
static void block_job_defer_to_main_loop_bh(void *opaque)
|
|
{
|
|
BlockJobDeferToMainLoopData *data = opaque;
|
|
AioContext *aio_context;
|
|
|
|
/* Prevent race with block_job_defer_to_main_loop() */
|
|
aio_context_acquire(data->aio_context);
|
|
|
|
/* Fetch BDS AioContext again, in case it has changed */
|
|
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);
|
|
|
|
aio_context_release(data->aio_context);
|
|
|
|
g_free(data);
|
|
}
|
|
|
|
void block_job_defer_to_main_loop(BlockJob *job,
|
|
BlockJobDeferToMainLoopFn *fn,
|
|
void *opaque)
|
|
{
|
|
BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data));
|
|
data->job = job;
|
|
data->aio_context = blk_get_aio_context(job->blk);
|
|
data->fn = fn;
|
|
data->opaque = opaque;
|
|
job->deferred_to_main_loop = true;
|
|
|
|
aio_bh_schedule_oneshot(qemu_get_aio_context(),
|
|
block_job_defer_to_main_loop_bh, data);
|
|
}
|
|
|
|
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);
|
|
}
|