580 lines
16 KiB
C
580 lines
16 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 "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 "block/trace.h"
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#include "sysemu/block-backend.h"
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#include "qapi/error.h"
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#include "qapi/qapi-events-block-core.h"
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#include "qapi/qmp/qerror.h"
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#include "qemu/coroutine.h"
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#include "qemu/main-loop.h"
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#include "qemu/timer.h"
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static bool is_block_job(Job *job)
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{
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return job_type(job) == JOB_TYPE_BACKUP ||
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job_type(job) == JOB_TYPE_COMMIT ||
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job_type(job) == JOB_TYPE_MIRROR ||
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job_type(job) == JOB_TYPE_STREAM;
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}
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BlockJob *block_job_next_locked(BlockJob *bjob)
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{
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Job *job = bjob ? &bjob->job : NULL;
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GLOBAL_STATE_CODE();
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do {
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job = job_next_locked(job);
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} while (job && !is_block_job(job));
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return job ? container_of(job, BlockJob, job) : NULL;
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}
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BlockJob *block_job_get_locked(const char *id)
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{
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Job *job = job_get_locked(id);
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GLOBAL_STATE_CODE();
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if (job && is_block_job(job)) {
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return container_of(job, BlockJob, job);
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} else {
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return NULL;
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}
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}
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BlockJob *block_job_get(const char *id)
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{
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JOB_LOCK_GUARD();
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return block_job_get_locked(id);
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}
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void block_job_free(Job *job)
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{
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BlockJob *bjob = container_of(job, BlockJob, job);
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GLOBAL_STATE_CODE();
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block_job_remove_all_bdrv(bjob);
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ratelimit_destroy(&bjob->limit);
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error_free(bjob->blocker);
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}
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static char *child_job_get_parent_desc(BdrvChild *c)
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{
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BlockJob *job = c->opaque;
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return g_strdup_printf("%s job '%s'", job_type_str(&job->job), job->job.id);
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}
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static void child_job_drained_begin(BdrvChild *c)
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{
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BlockJob *job = c->opaque;
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job_pause(&job->job);
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}
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static bool child_job_drained_poll(BdrvChild *c)
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{
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BlockJob *bjob = c->opaque;
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Job *job = &bjob->job;
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const BlockJobDriver *drv = block_job_driver(bjob);
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/* An inactive or completed job doesn't have any pending requests. Jobs
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* with !job->busy are either already paused or have a pause point after
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* being reentered, so no job driver code will run before they pause. */
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WITH_JOB_LOCK_GUARD() {
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if (!job->busy || job_is_completed_locked(job)) {
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return false;
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}
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}
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/* Otherwise, assume that it isn't fully stopped yet, but allow the job to
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* override this assumption. */
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if (drv->drained_poll) {
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return drv->drained_poll(bjob);
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} else {
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return true;
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}
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}
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static void child_job_drained_end(BdrvChild *c, int *drained_end_counter)
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{
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BlockJob *job = c->opaque;
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job_resume(&job->job);
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}
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static bool child_job_can_set_aio_ctx(BdrvChild *c, AioContext *ctx,
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GSList **ignore, Error **errp)
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{
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BlockJob *job = c->opaque;
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GSList *l;
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for (l = job->nodes; l; l = l->next) {
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BdrvChild *sibling = l->data;
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if (!bdrv_child_can_set_aio_context(sibling, ctx, ignore, errp)) {
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return false;
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}
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}
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return true;
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}
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static void child_job_set_aio_ctx(BdrvChild *c, AioContext *ctx,
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GSList **ignore)
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{
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BlockJob *job = c->opaque;
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GSList *l;
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for (l = job->nodes; l; l = l->next) {
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BdrvChild *sibling = l->data;
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if (g_slist_find(*ignore, sibling)) {
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continue;
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}
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*ignore = g_slist_prepend(*ignore, sibling);
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bdrv_set_aio_context_ignore(sibling->bs, ctx, ignore);
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}
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job_set_aio_context(&job->job, ctx);
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}
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static AioContext *child_job_get_parent_aio_context(BdrvChild *c)
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{
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BlockJob *job = c->opaque;
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GLOBAL_STATE_CODE();
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return job->job.aio_context;
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}
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static const BdrvChildClass child_job = {
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.get_parent_desc = child_job_get_parent_desc,
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.drained_begin = child_job_drained_begin,
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.drained_poll = child_job_drained_poll,
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.drained_end = child_job_drained_end,
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.can_set_aio_ctx = child_job_can_set_aio_ctx,
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.set_aio_ctx = child_job_set_aio_ctx,
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.stay_at_node = true,
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.get_parent_aio_context = child_job_get_parent_aio_context,
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};
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void block_job_remove_all_bdrv(BlockJob *job)
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{
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GLOBAL_STATE_CODE();
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/*
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* bdrv_root_unref_child() may reach child_job_[can_]set_aio_ctx(),
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* which will also traverse job->nodes, so consume the list one by
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* one to make sure that such a concurrent access does not attempt
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* to process an already freed BdrvChild.
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*/
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while (job->nodes) {
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GSList *l = job->nodes;
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BdrvChild *c = l->data;
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job->nodes = l->next;
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bdrv_op_unblock_all(c->bs, job->blocker);
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bdrv_root_unref_child(c);
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g_slist_free_1(l);
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}
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}
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bool block_job_has_bdrv(BlockJob *job, BlockDriverState *bs)
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{
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GSList *el;
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GLOBAL_STATE_CODE();
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for (el = job->nodes; el; el = el->next) {
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BdrvChild *c = el->data;
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if (c->bs == bs) {
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return true;
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}
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}
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return false;
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}
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int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
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uint64_t perm, uint64_t shared_perm, Error **errp)
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{
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BdrvChild *c;
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bool need_context_ops;
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GLOBAL_STATE_CODE();
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bdrv_ref(bs);
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need_context_ops = bdrv_get_aio_context(bs) != job->job.aio_context;
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if (need_context_ops && job->job.aio_context != qemu_get_aio_context()) {
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aio_context_release(job->job.aio_context);
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}
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c = bdrv_root_attach_child(bs, name, &child_job, 0, perm, shared_perm, job,
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errp);
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if (need_context_ops && job->job.aio_context != qemu_get_aio_context()) {
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aio_context_acquire(job->job.aio_context);
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}
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if (c == NULL) {
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return -EPERM;
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}
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job->nodes = g_slist_prepend(job->nodes, c);
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bdrv_op_block_all(bs, job->blocker);
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return 0;
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}
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/* Called with job_mutex lock held. */
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static void block_job_on_idle_locked(Notifier *n, void *opaque)
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{
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aio_wait_kick();
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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->job.id == NULL);
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}
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const BlockJobDriver *block_job_driver(BlockJob *job)
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{
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return container_of(job->job.driver, BlockJobDriver, job_driver);
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}
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/* Assumes the job_mutex is held */
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static bool job_timer_pending(Job *job)
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{
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return timer_pending(&job->sleep_timer);
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}
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bool block_job_set_speed_locked(BlockJob *job, int64_t speed, Error **errp)
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{
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const BlockJobDriver *drv = block_job_driver(job);
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int64_t old_speed = job->speed;
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GLOBAL_STATE_CODE();
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if (job_apply_verb_locked(&job->job, JOB_VERB_SET_SPEED, errp) < 0) {
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return false;
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}
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if (speed < 0) {
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error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "speed",
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"a non-negative value");
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return false;
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}
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ratelimit_set_speed(&job->limit, speed, BLOCK_JOB_SLICE_TIME);
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job->speed = speed;
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if (drv->set_speed) {
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job_unlock();
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drv->set_speed(job, speed);
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job_lock();
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}
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if (speed && speed <= old_speed) {
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return true;
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}
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/* kick only if a timer is pending */
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job_enter_cond_locked(&job->job, job_timer_pending);
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return true;
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}
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static bool block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
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{
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JOB_LOCK_GUARD();
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return block_job_set_speed_locked(job, speed, errp);
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}
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int64_t block_job_ratelimit_get_delay(BlockJob *job, uint64_t n)
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{
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IO_CODE();
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return ratelimit_calculate_delay(&job->limit, n);
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}
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BlockJobInfo *block_job_query_locked(BlockJob *job, Error **errp)
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{
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BlockJobInfo *info;
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uint64_t progress_current, progress_total;
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GLOBAL_STATE_CODE();
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if (block_job_is_internal(job)) {
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error_setg(errp, "Cannot query QEMU internal jobs");
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return NULL;
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}
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progress_get_snapshot(&job->job.progress, &progress_current,
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&progress_total);
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info = g_new0(BlockJobInfo, 1);
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info->type = g_strdup(job_type_str(&job->job));
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info->device = g_strdup(job->job.id);
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info->busy = job->job.busy;
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info->paused = job->job.pause_count > 0;
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info->offset = progress_current;
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info->len = progress_total;
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info->speed = job->speed;
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info->io_status = job->iostatus;
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info->ready = job_is_ready_locked(&job->job),
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info->status = job->job.status;
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info->auto_finalize = job->job.auto_finalize;
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info->auto_dismiss = job->job.auto_dismiss;
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if (job->job.ret) {
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info->has_error = true;
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info->error = job->job.err ?
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g_strdup(error_get_pretty(job->job.err)) :
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g_strdup(strerror(-job->job.ret));
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}
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return info;
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}
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/* Called with job lock held */
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static void block_job_iostatus_set_err_locked(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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/* Called with job_mutex lock held. */
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static void block_job_event_cancelled_locked(Notifier *n, void *opaque)
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{
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BlockJob *job = opaque;
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uint64_t progress_current, progress_total;
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if (block_job_is_internal(job)) {
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return;
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}
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progress_get_snapshot(&job->job.progress, &progress_current,
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&progress_total);
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qapi_event_send_block_job_cancelled(job_type(&job->job),
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job->job.id,
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progress_total,
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progress_current,
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job->speed);
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}
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/* Called with job_mutex lock held. */
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static void block_job_event_completed_locked(Notifier *n, void *opaque)
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{
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BlockJob *job = opaque;
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const char *msg = NULL;
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uint64_t progress_current, progress_total;
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if (block_job_is_internal(job)) {
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return;
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}
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if (job->job.ret < 0) {
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msg = error_get_pretty(job->job.err);
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}
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progress_get_snapshot(&job->job.progress, &progress_current,
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&progress_total);
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qapi_event_send_block_job_completed(job_type(&job->job),
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job->job.id,
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progress_total,
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progress_current,
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job->speed,
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!!msg,
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msg);
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}
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/* Called with job_mutex lock held. */
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static void block_job_event_pending_locked(Notifier *n, void *opaque)
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{
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BlockJob *job = opaque;
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if (block_job_is_internal(job)) {
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return;
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}
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qapi_event_send_block_job_pending(job_type(&job->job),
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job->job.id);
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}
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/* Called with job_mutex lock held. */
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static void block_job_event_ready_locked(Notifier *n, void *opaque)
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{
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BlockJob *job = opaque;
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uint64_t progress_current, progress_total;
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if (block_job_is_internal(job)) {
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return;
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}
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progress_get_snapshot(&job->job.progress, &progress_current,
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&progress_total);
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qapi_event_send_block_job_ready(job_type(&job->job),
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job->job.id,
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progress_total,
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progress_current,
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job->speed);
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}
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void *block_job_create(const char *job_id, const BlockJobDriver *driver,
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JobTxn *txn, BlockDriverState *bs, uint64_t perm,
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uint64_t shared_perm, int64_t speed, int flags,
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BlockCompletionFunc *cb, void *opaque, Error **errp)
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{
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BlockJob *job;
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int ret;
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GLOBAL_STATE_CODE();
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if (job_id == NULL && !(flags & JOB_INTERNAL)) {
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job_id = bdrv_get_device_name(bs);
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}
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job = job_create(job_id, &driver->job_driver, txn, bdrv_get_aio_context(bs),
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flags, cb, opaque, errp);
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if (job == NULL) {
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return NULL;
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}
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assert(is_block_job(&job->job));
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assert(job->job.driver->free == &block_job_free);
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assert(job->job.driver->user_resume == &block_job_user_resume);
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ratelimit_init(&job->limit);
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job->finalize_cancelled_notifier.notify = block_job_event_cancelled_locked;
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job->finalize_completed_notifier.notify = block_job_event_completed_locked;
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job->pending_notifier.notify = block_job_event_pending_locked;
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job->ready_notifier.notify = block_job_event_ready_locked;
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job->idle_notifier.notify = block_job_on_idle_locked;
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WITH_JOB_LOCK_GUARD() {
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notifier_list_add(&job->job.on_finalize_cancelled,
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&job->finalize_cancelled_notifier);
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notifier_list_add(&job->job.on_finalize_completed,
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&job->finalize_completed_notifier);
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notifier_list_add(&job->job.on_pending, &job->pending_notifier);
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notifier_list_add(&job->job.on_ready, &job->ready_notifier);
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notifier_list_add(&job->job.on_idle, &job->idle_notifier);
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}
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error_setg(&job->blocker, "block device is in use by block job: %s",
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job_type_str(&job->job));
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ret = block_job_add_bdrv(job, "main node", bs, perm, shared_perm, errp);
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if (ret < 0) {
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goto fail;
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}
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bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
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if (!block_job_set_speed(job, speed, errp)) {
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goto fail;
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}
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return job;
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fail:
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job_early_fail(&job->job);
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return NULL;
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}
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void block_job_iostatus_reset_locked(BlockJob *job)
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{
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GLOBAL_STATE_CODE();
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if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
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return;
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}
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assert(job->job.user_paused && job->job.pause_count > 0);
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job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
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}
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static void block_job_iostatus_reset(BlockJob *job)
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|
{
|
|
JOB_LOCK_GUARD();
|
|
block_job_iostatus_reset_locked(job);
|
|
}
|
|
|
|
void block_job_user_resume(Job *job)
|
|
{
|
|
BlockJob *bjob = container_of(job, BlockJob, job);
|
|
GLOBAL_STATE_CODE();
|
|
block_job_iostatus_reset(bjob);
|
|
}
|
|
|
|
BlockErrorAction block_job_error_action(BlockJob *job, BlockdevOnError on_err,
|
|
int is_read, int error)
|
|
{
|
|
BlockErrorAction action;
|
|
IO_CODE();
|
|
|
|
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->job.id,
|
|
is_read ? IO_OPERATION_TYPE_READ :
|
|
IO_OPERATION_TYPE_WRITE,
|
|
action);
|
|
}
|
|
if (action == BLOCK_ERROR_ACTION_STOP) {
|
|
WITH_JOB_LOCK_GUARD() {
|
|
if (!job->job.user_paused) {
|
|
job_pause_locked(&job->job);
|
|
/*
|
|
* make the pause user visible, which will be
|
|
* resumed from QMP.
|
|
*/
|
|
job->job.user_paused = true;
|
|
}
|
|
block_job_iostatus_set_err_locked(job, error);
|
|
}
|
|
}
|
|
return action;
|
|
}
|
|
|
|
AioContext *block_job_get_aio_context(BlockJob *job)
|
|
{
|
|
GLOBAL_STATE_CODE();
|
|
return job->job.aio_context;
|
|
}
|