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qemu-patch-raspberry4/blockjob.c
Kevin Wolf 62c9e4162a job: Switch transactions to JobTxn 
This doesn't actually move any transaction code to Job yet, but it
renames the type for transactions from BlockJobTxn to JobTxn and makes
them contain Jobs rather than BlockJobs

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
2018-05-23 14:30:50 +02:00

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/*
* QEMU System Emulator block driver
*
* Copyright (c) 2011 IBM Corp.
* Copyright (c) 2012 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "block/block.h"
#include "block/blockjob_int.h"
#include "block/block_int.h"
#include "block/trace.h"
#include "sysemu/block-backend.h"
#include "qapi/error.h"
#include "qapi/qapi-events-block-core.h"
#include "qapi/qmp/qerror.h"
#include "qemu/coroutine.h"
#include "qemu/timer.h"
/* Transactional group of block jobs */
struct JobTxn {
/* Is this txn being cancelled? */
bool aborting;
/* List of jobs */
QLIST_HEAD(, Job) jobs;
/* Reference count */
int refcnt;
};
/*
* The block job API is composed of two categories of functions.
*
* The first includes functions used by the monitor. The monitor is
* peculiar in that it accesses the block job list with block_job_get, and
* therefore needs consistency across block_job_get and the actual operation
* (e.g. block_job_set_speed). The consistency is achieved with
* aio_context_acquire/release. These functions are declared in blockjob.h.
*
* The second includes functions used by the block job drivers and sometimes
* by the core block layer. These do not care about locking, because the
* whole coroutine runs under the AioContext lock, and are declared in
* blockjob_int.h.
*/
static bool is_block_job(Job *job)
{
return job_type(job) == JOB_TYPE_BACKUP ||
job_type(job) == JOB_TYPE_COMMIT ||
job_type(job) == JOB_TYPE_MIRROR ||
job_type(job) == JOB_TYPE_STREAM;
}
BlockJob *block_job_next(BlockJob *bjob)
{
Job *job = bjob ? &bjob->job : NULL;
do {
job = job_next(job);
} while (job && !is_block_job(job));
return job ? container_of(job, BlockJob, job) : NULL;
}
BlockJob *block_job_get(const char *id)
{
Job *job = job_get(id);
if (job && is_block_job(job)) {
return container_of(job, BlockJob, job);
} else {
return NULL;
}
}
JobTxn *block_job_txn_new(void)
{
JobTxn *txn = g_new0(JobTxn, 1);
QLIST_INIT(&txn->jobs);
txn->refcnt = 1;
return txn;
}
static void block_job_txn_ref(JobTxn *txn)
{
txn->refcnt++;
}
void block_job_txn_unref(JobTxn *txn)
{
if (txn && --txn->refcnt == 0) {
g_free(txn);
}
}
void block_job_txn_add_job(JobTxn *txn, BlockJob *job)
{
if (!txn) {
return;
}
assert(!job->txn);
job->txn = txn;
QLIST_INSERT_HEAD(&txn->jobs, &job->job, txn_list);
block_job_txn_ref(txn);
}
void block_job_txn_del_job(BlockJob *job)
{
if (job->txn) {
QLIST_REMOVE(&job->job, txn_list);
block_job_txn_unref(job->txn);
job->txn = NULL;
}
}
static void block_job_attached_aio_context(AioContext *new_context,
void *opaque);
static void block_job_detach_aio_context(void *opaque);
void block_job_free(Job *job)
{
BlockJob *bjob = container_of(job, BlockJob, job);
BlockDriverState *bs = blk_bs(bjob->blk);
assert(!bjob->txn);
bs->job = NULL;
block_job_remove_all_bdrv(bjob);
blk_remove_aio_context_notifier(bjob->blk,
block_job_attached_aio_context,
block_job_detach_aio_context, bjob);
blk_unref(bjob->blk);
error_free(bjob->blocker);
}
static void block_job_attached_aio_context(AioContext *new_context,
void *opaque)
{
BlockJob *job = opaque;
job->job.aio_context = new_context;
if (job->driver->attached_aio_context) {
job->driver->attached_aio_context(job, new_context);
}
job_resume(&job->job);
}
void block_job_drain(Job *job)
{
BlockJob *bjob = container_of(job, BlockJob, job);
blk_drain(bjob->blk);
if (bjob->driver->drain) {
bjob->driver->drain(bjob);
}
}
static void block_job_detach_aio_context(void *opaque)
{
BlockJob *job = opaque;
/* In case the job terminates during aio_poll()... */
job_ref(&job->job);
job_pause(&job->job);
while (!job->job.paused && !job_is_completed(&job->job)) {
job_drain(&job->job);
}
job->job.aio_context = NULL;
job_unref(&job->job);
}
static char *child_job_get_parent_desc(BdrvChild *c)
{
BlockJob *job = c->opaque;
return g_strdup_printf("%s job '%s'", job_type_str(&job->job), job->job.id);
}
static void child_job_drained_begin(BdrvChild *c)
{
BlockJob *job = c->opaque;
job_pause(&job->job);
}
static void child_job_drained_end(BdrvChild *c)
{
BlockJob *job = c->opaque;
job_resume(&job->job);
}
static const BdrvChildRole child_job = {
.get_parent_desc = child_job_get_parent_desc,
.drained_begin = child_job_drained_begin,
.drained_end = child_job_drained_end,
.stay_at_node = true,
};
void block_job_remove_all_bdrv(BlockJob *job)
{
GSList *l;
for (l = job->nodes; l; l = l->next) {
BdrvChild *c = l->data;
bdrv_op_unblock_all(c->bs, job->blocker);
bdrv_root_unref_child(c);
}
g_slist_free(job->nodes);
job->nodes = NULL;
}
int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
uint64_t perm, uint64_t shared_perm, Error **errp)
{
BdrvChild *c;
c = bdrv_root_attach_child(bs, name, &child_job, perm, shared_perm,
job, errp);
if (c == NULL) {
return -EPERM;
}
job->nodes = g_slist_prepend(job->nodes, c);
bdrv_ref(bs);
bdrv_op_block_all(bs, job->blocker);
return 0;
}
bool block_job_is_internal(BlockJob *job)
{
return (job->job.id == NULL);
}
const BlockJobDriver *block_job_driver(BlockJob *job)
{
return job->driver;
}
static int block_job_prepare(BlockJob *job)
{
if (job->job.ret == 0 && job->driver->prepare) {
job->job.ret = job->driver->prepare(job);
}
return job->job.ret;
}
static void job_cancel_async(Job *job, bool force)
{
if (job->user_paused) {
/* Do not call job_enter here, the caller will handle it. */
job->user_paused = false;
if (job->driver->user_resume) {
job->driver->user_resume(job);
}
assert(job->pause_count > 0);
job->pause_count--;
}
job->cancelled = true;
/* To prevent 'force == false' overriding a previous 'force == true' */
job->force_cancel |= force;
}
static int block_job_txn_apply(JobTxn *txn, int fn(BlockJob *), bool lock)
{
AioContext *ctx;
Job *job, *next;
BlockJob *bjob;
int rc = 0;
QLIST_FOREACH_SAFE(job, &txn->jobs, txn_list, next) {
assert(is_block_job(job));
bjob = container_of(job, BlockJob, job);
if (lock) {
ctx = job->aio_context;
aio_context_acquire(ctx);
}
rc = fn(bjob);
if (lock) {
aio_context_release(ctx);
}
if (rc) {
break;
}
}
return rc;
}
static void block_job_completed_txn_abort(BlockJob *job)
{
AioContext *ctx;
JobTxn *txn = job->txn;
Job *other_job;
if (txn->aborting) {
/*
* We are cancelled by another job, which will handle everything.
*/
return;
}
txn->aborting = true;
block_job_txn_ref(txn);
/* We are the first failed job. Cancel other jobs. */
QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
ctx = other_job->aio_context;
aio_context_acquire(ctx);
}
/* Other jobs are effectively cancelled by us, set the status for
* them; this job, however, may or may not be cancelled, depending
* on the caller, so leave it. */
QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
if (other_job != &job->job) {
job_cancel_async(other_job, false);
}
}
while (!QLIST_EMPTY(&txn->jobs)) {
other_job = QLIST_FIRST(&txn->jobs);
ctx = other_job->aio_context;
if (!job_is_completed(other_job)) {
assert(job_is_cancelled(other_job));
job_finish_sync(other_job, NULL, NULL);
}
job_finalize_single(other_job);
aio_context_release(ctx);
}
block_job_txn_unref(txn);
}
static int block_job_needs_finalize(BlockJob *job)
{
return !job->job.auto_finalize;
}
static int block_job_finalize_single(BlockJob *job)
{
return job_finalize_single(&job->job);
}
static void block_job_do_finalize(BlockJob *job)
{
int rc;
assert(job && job->txn);
/* prepare the transaction to complete */
rc = block_job_txn_apply(job->txn, block_job_prepare, true);
if (rc) {
block_job_completed_txn_abort(job);
} else {
block_job_txn_apply(job->txn, block_job_finalize_single, true);
}
}
static int block_job_transition_to_pending(BlockJob *job)
{
job_state_transition(&job->job, JOB_STATUS_PENDING);
if (!job->job.auto_finalize) {
job_event_pending(&job->job);
}
return 0;
}
static void block_job_completed_txn_success(BlockJob *job)
{
JobTxn *txn = job->txn;
Job *other_job;
job_state_transition(&job->job, JOB_STATUS_WAITING);
/*
* Successful completion, see if there are other running jobs in this
* txn.
*/
QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
if (!job_is_completed(other_job)) {
return;
}
assert(other_job->ret == 0);
}
block_job_txn_apply(txn, block_job_transition_to_pending, false);
/* If no jobs need manual finalization, automatically do so */
if (block_job_txn_apply(txn, block_job_needs_finalize, false) == 0) {
block_job_do_finalize(job);
}
}
/* Assumes the job_mutex is held */
static bool job_timer_pending(Job *job)
{
return timer_pending(&job->sleep_timer);
}
void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
{
int64_t old_speed = job->speed;
if (job_apply_verb(&job->job, JOB_VERB_SET_SPEED, errp)) {
return;
}
if (speed < 0) {
error_setg(errp, QERR_INVALID_PARAMETER, "speed");
return;
}
ratelimit_set_speed(&job->limit, speed, BLOCK_JOB_SLICE_TIME);
job->speed = speed;
if (speed && speed <= old_speed) {
return;
}
/* kick only if a timer is pending */
job_enter_cond(&job->job, job_timer_pending);
}
int64_t block_job_ratelimit_get_delay(BlockJob *job, uint64_t n)
{
if (!job->speed) {
return 0;
}
return ratelimit_calculate_delay(&job->limit, n);
}
void block_job_finalize(BlockJob *job, Error **errp)
{
assert(job && job->job.id);
if (job_apply_verb(&job->job, JOB_VERB_FINALIZE, errp)) {
return;
}
block_job_do_finalize(job);
}
void block_job_dismiss(BlockJob **jobptr, Error **errp)
{
BlockJob *job = *jobptr;
/* similarly to _complete, this is QMP-interface only. */
assert(job->job.id);
if (job_apply_verb(&job->job, JOB_VERB_DISMISS, errp)) {
return;
}
job_do_dismiss(&job->job);
*jobptr = NULL;
}
void block_job_cancel(BlockJob *job, bool force)
{
if (job->job.status == JOB_STATUS_CONCLUDED) {
job_do_dismiss(&job->job);
return;
}
job_cancel_async(&job->job, force);
if (!job_started(&job->job)) {
block_job_completed(job, -ECANCELED);
} else if (job->job.deferred_to_main_loop) {
block_job_completed_txn_abort(job);
} else {
block_job_enter(job);
}
}
void block_job_user_cancel(BlockJob *job, bool force, Error **errp)
{
if (job_apply_verb(&job->job, JOB_VERB_CANCEL, errp)) {
return;
}
block_job_cancel(job, force);
}
/* A wrapper around block_job_cancel() taking an Error ** parameter so it may be
* used with job_finish_sync() without the need for (rather nasty) function
* pointer casts there. */
static void block_job_cancel_err(Job *job, Error **errp)
{
BlockJob *bjob = container_of(job, BlockJob, job);
assert(is_block_job(job));
block_job_cancel(bjob, false);
}
int block_job_cancel_sync(BlockJob *job)
{
return job_finish_sync(&job->job, &block_job_cancel_err, NULL);
}
void block_job_cancel_sync_all(void)
{
BlockJob *job;
AioContext *aio_context;
while ((job = block_job_next(NULL))) {
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 job_finish_sync(&job->job, job_complete, errp);
}
void block_job_progress_update(BlockJob *job, uint64_t done)
{
job->offset += done;
}
void block_job_progress_set_remaining(BlockJob *job, uint64_t remaining)
{
job->len = job->offset + remaining;
}
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(job_type_str(&job->job));
info->device = g_strdup(job->job.id);
info->len = job->len;
info->busy = atomic_read(&job->job.busy);
info->paused = job->job.pause_count > 0;
info->offset = job->offset;
info->speed = job->speed;
info->io_status = job->iostatus;
info->ready = job->ready;
info->status = job->job.status;
info->auto_finalize = job->job.auto_finalize;
info->auto_dismiss = job->job.auto_dismiss;
info->has_error = job->job.ret != 0;
info->error = job->job.ret ? g_strdup(strerror(-job->job.ret)) : NULL;
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(Notifier *n, void *opaque)
{
BlockJob *job = opaque;
if (block_job_is_internal(job)) {
return;
}
qapi_event_send_block_job_cancelled(job_type(&job->job),
job->job.id,
job->len,
job->offset,
job->speed,
&error_abort);
}
static void block_job_event_completed(Notifier *n, void *opaque)
{
BlockJob *job = opaque;
const char *msg = NULL;
if (block_job_is_internal(job)) {
return;
}
if (job->job.ret < 0) {
msg = strerror(-job->job.ret);
}
qapi_event_send_block_job_completed(job_type(&job->job),
job->job.id,
job->len,
job->offset,
job->speed,
!!msg,
msg,
&error_abort);
}
static void block_job_event_pending(Notifier *n, void *opaque)
{
BlockJob *job = opaque;
if (block_job_is_internal(job)) {
return;
}
qapi_event_send_block_job_pending(job_type(&job->job),
job->job.id,
&error_abort);
}
/*
* API for block job drivers and the block layer. These functions are
* declared in blockjob_int.h.
*/
void *block_job_create(const char *job_id, const BlockJobDriver *driver,
JobTxn *txn, BlockDriverState *bs, uint64_t perm,
uint64_t shared_perm, int64_t speed, int flags,
BlockCompletionFunc *cb, void *opaque, Error **errp)
{
BlockBackend *blk;
BlockJob *job;
int ret;
if (bs->job) {
error_setg(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs));
return NULL;
}
if (job_id == NULL && !(flags & JOB_INTERNAL)) {
job_id = bdrv_get_device_name(bs);
}
blk = blk_new(perm, shared_perm);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
blk_unref(blk);
return NULL;
}
job = job_create(job_id, &driver->job_driver, blk_get_aio_context(blk),
flags, cb, opaque, errp);
if (job == NULL) {
blk_unref(blk);
return NULL;
}
assert(is_block_job(&job->job));
assert(job->job.driver->free == &block_job_free);
assert(job->job.driver->user_resume == &block_job_user_resume);
assert(job->job.driver->drain == &block_job_drain);
job->driver = driver;
job->blk = blk;
job->finalize_cancelled_notifier.notify = block_job_event_cancelled;
job->finalize_completed_notifier.notify = block_job_event_completed;
job->pending_notifier.notify = block_job_event_pending;
notifier_list_add(&job->job.on_finalize_cancelled,
&job->finalize_cancelled_notifier);
notifier_list_add(&job->job.on_finalize_completed,
&job->finalize_completed_notifier);
notifier_list_add(&job->job.on_pending, &job->pending_notifier);
error_setg(&job->blocker, "block device is in use by block job: %s",
job_type_str(&job->job));
block_job_add_bdrv(job, "main node", bs, 0, BLK_PERM_ALL, &error_abort);
bs->job = job;
bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
blk_add_aio_context_notifier(blk, block_job_attached_aio_context,
block_job_detach_aio_context, job);
/* Only set speed when necessary to avoid NotSupported error */
if (speed != 0) {
Error *local_err = NULL;
block_job_set_speed(job, speed, &local_err);
if (local_err) {
job_early_fail(&job->job);
error_propagate(errp, local_err);
return NULL;
}
}
/* Single jobs are modeled as single-job transactions for sake of
* consolidating the job management logic */
if (!txn) {
txn = block_job_txn_new();
block_job_txn_add_job(txn, job);
block_job_txn_unref(txn);
} else {
block_job_txn_add_job(txn, job);
}
return job;
}
void block_job_completed(BlockJob *job, int ret)
{
assert(job && job->txn && !job_is_completed(&job->job));
assert(blk_bs(job->blk)->job == job);
job->job.ret = ret;
job_update_rc(&job->job);
trace_block_job_completed(job, ret, job->job.ret);
if (job->job.ret) {
block_job_completed_txn_abort(job);
} else {
block_job_completed_txn_success(job);
}
}
void block_job_enter(BlockJob *job)
{
job_enter_cond(&job->job, NULL);
}
void block_job_yield(BlockJob *job)
{
assert(job->job.busy);
/* Check cancellation *before* setting busy = false, too! */
if (job_is_cancelled(&job->job)) {
return;
}
if (!job_should_pause(&job->job)) {
job_do_yield(&job->job, -1);
}
job_pause_point(&job->job);
}
void block_job_iostatus_reset(BlockJob *job)
{
if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
return;
}
assert(job->job.user_paused && job->job.pause_count > 0);
job->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
}
void block_job_user_resume(Job *job)
{
BlockJob *bjob = container_of(job, BlockJob, job);
block_job_iostatus_reset(bjob);
}
void block_job_event_ready(BlockJob *job)
{
job_state_transition(&job->job, JOB_STATUS_READY);
job->ready = true;
if (block_job_is_internal(job)) {
return;
}
qapi_event_send_block_job_ready(job_type(&job->job),
job->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->job.id,
is_read ? IO_OPERATION_TYPE_READ :
IO_OPERATION_TYPE_WRITE,
action, &error_abort);
}
if (action == BLOCK_ERROR_ACTION_STOP) {
job_pause(&job->job);
/* make the pause user visible, which will be resumed from QMP. */
job->job.user_paused = true;
block_job_iostatus_set_err(job, error);
}
return action;
}
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