532 lines
14 KiB
C
532 lines
14 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.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 "qmp-commands.h"
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#include "qemu/timer.h"
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#include "qapi-event.h"
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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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void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
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int64_t speed, BlockCompletionFunc *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) {
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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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bdrv_ref(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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bdrv_op_block_all(bs, job->blocker);
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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(bdrv_get_device_name(bs));
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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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job->refcnt = 1;
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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 (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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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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job->bs->job = NULL;
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bdrv_op_unblock_all(job->bs, job->blocker);
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bdrv_unref(job->bs);
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error_free(job->blocker);
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g_free(job->id);
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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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job->cb(job->opaque, job->ret);
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if (job->txn) {
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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 = bdrv_get_aio_context(other_job->bs);
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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 = bdrv_get_aio_context(other_job->bs);
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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 = bdrv_get_aio_context(other_job->bs);
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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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BlockDriverState *bs = job->bs;
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assert(bs->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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if (job->pause_count || job->cancelled || !job->driver->complete) {
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error_setg(errp, QERR_BLOCK_JOB_NOT_READY, 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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bool block_job_is_paused(BlockJob *job)
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{
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return job->pause_count > 0;
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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_enter(BlockJob *job)
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{
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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_enter(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->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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BlockDriverState *bs = job->bs;
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Error *local_err = NULL;
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int ret;
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assert(bs->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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while (!job->completed) {
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aio_poll(job->deferred_to_main_loop ? qemu_get_aio_context() :
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bdrv_get_aio_context(bs),
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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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int block_job_complete_sync(BlockJob *job, Error **errp)
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{
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return block_job_finish_sync(job, &block_job_complete, errp);
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}
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void block_job_sleep_ns(BlockJob *job, QEMUClockType type, 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_aio_sleep_ns(bdrv_get_aio_context(job->bs), type, ns);
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}
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job->busy = true;
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}
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void block_job_yield(BlockJob *job)
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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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qemu_coroutine_yield();
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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(BlockJobType_lookup[job->driver->job_type]);
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info->device = g_strdup(job->id);
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info->len = job->len;
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info->busy = job->busy;
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info->paused = job->pause_count > 0;
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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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info->ready = job->ready;
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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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void block_job_event_cancelled(BlockJob *job)
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{
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qapi_event_send_block_job_cancelled(job->driver->job_type,
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job->id,
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job->len,
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job->offset,
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job->speed,
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&error_abort);
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}
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void block_job_event_completed(BlockJob *job, const char *msg)
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{
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qapi_event_send_block_job_completed(job->driver->job_type,
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job->id,
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job->len,
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job->offset,
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job->speed,
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!!msg,
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msg,
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&error_abort);
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}
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void block_job_event_ready(BlockJob *job)
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{
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job->ready = true;
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qapi_event_send_block_job_ready(job->driver->job_type,
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job->id,
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job->len,
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job->offset,
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job->speed, &error_abort);
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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) ?
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BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT;
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break;
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case BLOCKDEV_ON_ERROR_STOP:
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action = BLOCK_ERROR_ACTION_STOP;
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break;
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case BLOCKDEV_ON_ERROR_REPORT:
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action = BLOCK_ERROR_ACTION_REPORT;
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break;
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case BLOCKDEV_ON_ERROR_IGNORE:
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action = BLOCK_ERROR_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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qapi_event_send_block_job_error(job->id,
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is_read ? IO_OPERATION_TYPE_READ :
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IO_OPERATION_TYPE_WRITE,
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action, &error_abort);
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if (action == BLOCK_ERROR_ACTION_STOP) {
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/* make the pause user visible, which will be resumed from QMP. */
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job->user_paused = true;
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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->blk && bs != job->bs) {
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blk_iostatus_set_err(bs->blk, error);
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}
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}
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return action;
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}
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typedef struct {
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BlockJob *job;
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QEMUBH *bh;
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AioContext *aio_context;
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BlockJobDeferToMainLoopFn *fn;
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void *opaque;
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} BlockJobDeferToMainLoopData;
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static void block_job_defer_to_main_loop_bh(void *opaque)
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{
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BlockJobDeferToMainLoopData *data = opaque;
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AioContext *aio_context;
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qemu_bh_delete(data->bh);
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/* Prevent race with block_job_defer_to_main_loop() */
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aio_context_acquire(data->aio_context);
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/* Fetch BDS AioContext again, in case it has changed */
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aio_context = bdrv_get_aio_context(data->job->bs);
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aio_context_acquire(aio_context);
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data->job->deferred_to_main_loop = false;
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data->fn(data->job, data->opaque);
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aio_context_release(aio_context);
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aio_context_release(data->aio_context);
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g_free(data);
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}
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void block_job_defer_to_main_loop(BlockJob *job,
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BlockJobDeferToMainLoopFn *fn,
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void *opaque)
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{
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BlockJobDeferToMainLoopData *data = g_malloc(sizeof(*data));
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data->job = job;
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data->bh = qemu_bh_new(block_job_defer_to_main_loop_bh, data);
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data->aio_context = bdrv_get_aio_context(job->bs);
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data->fn = fn;
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data->opaque = opaque;
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job->deferred_to_main_loop = true;
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qemu_bh_schedule(data->bh);
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}
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BlockJobTxn *block_job_txn_new(void)
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{
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BlockJobTxn *txn = g_new0(BlockJobTxn, 1);
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QLIST_INIT(&txn->jobs);
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txn->refcnt = 1;
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return txn;
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}
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static void block_job_txn_ref(BlockJobTxn *txn)
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{
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txn->refcnt++;
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}
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void block_job_txn_unref(BlockJobTxn *txn)
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{
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if (txn && --txn->refcnt == 0) {
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g_free(txn);
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}
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}
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void block_job_txn_add_job(BlockJobTxn *txn, BlockJob *job)
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{
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if (!txn) {
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return;
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}
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assert(!job->txn);
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job->txn = txn;
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QLIST_INSERT_HEAD(&txn->jobs, job, txn_list);
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block_job_txn_ref(txn);
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}
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