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qemu-kvm/SOURCES/kvm-job-Move-transactions-to-Job.patch

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From 7ccb50f6be019258bfe5bb501142e39c5a4f52e4 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Tue, 26 Jun 2018 09:48:22 +0200
Subject: [PATCH 114/268] job: Move transactions to Job
RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <20180626094856.6924-40-kwolf@redhat.com>
Patchwork-id: 81097
O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH v2 39/73] job: Move transactions to Job
Bugzilla: 1513543
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Fam Zheng <famz@redhat.com>
This moves the logic that implements job transactions from BlockJob to
Job.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit 7eaa8fb57da96301f4a8ce176ad503f80efc7cc0)
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
blockdev.c | 6 +-
blockjob.c | 238 +------------------------------------------
include/block/blockjob.h | 54 ----------
include/block/blockjob_int.h | 10 --
include/qemu/job.h | 71 +++++++++++--
job.c | 234 ++++++++++++++++++++++++++++++++++++++++--
tests/test-blockjob-txn.c | 12 +--
tests/test-blockjob.c | 2 +-
8 files changed, 303 insertions(+), 324 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index 6efdb30..9aa2e79 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2256,7 +2256,7 @@ void qmp_transaction(TransactionActionList *dev_list,
*/
props = get_transaction_properties(props);
if (props->completion_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
- block_job_txn = block_job_txn_new();
+ block_job_txn = job_txn_new();
}
/* drain all i/o before any operations */
@@ -2315,7 +2315,7 @@ exit:
if (!has_props) {
qapi_free_TransactionProperties(props);
}
- block_job_txn_unref(block_job_txn);
+ job_txn_unref(block_job_txn);
}
void qmp_eject(bool has_device, const char *device,
@@ -3909,7 +3909,7 @@ void qmp_block_job_finalize(const char *id, Error **errp)
}
trace_qmp_block_job_finalize(job);
- block_job_finalize(job, errp);
+ job_finalize(&job->job, errp);
aio_context_release(aio_context);
}
diff --git a/blockjob.c b/blockjob.c
index bd35c4f..14b21c8 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -36,19 +36,6 @@
#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.
*
@@ -94,48 +81,6 @@ BlockJob *block_job_get(const char *id)
}
}
-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);
@@ -145,8 +90,6 @@ 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,
@@ -261,158 +204,6 @@ 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)
{
@@ -451,15 +242,6 @@ int64_t block_job_ratelimit_get_delay(BlockJob *job, uint64_t n)
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;
@@ -483,7 +265,7 @@ void block_job_cancel(BlockJob *job, bool 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);
+ job_completed_txn_abort(&job->job);
} else {
block_job_enter(job);
}
@@ -656,7 +438,7 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
return NULL;
}
- job = job_create(job_id, &driver->job_driver, blk_get_aio_context(blk),
+ job = job_create(job_id, &driver->job_driver, txn, blk_get_aio_context(blk),
flags, cb, opaque, errp);
if (job == NULL) {
blk_unref(blk);
@@ -703,30 +485,20 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
}
}
- /* 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(job && 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);
+ job_completed_txn_abort(&job->job);
} else {
- block_job_completed_txn_success(job);
+ job_completed_txn_success(&job->job);
}
}
diff --git a/include/block/blockjob.h b/include/block/blockjob.h
index 44df025..09e6bb4 100644
--- a/include/block/blockjob.h
+++ b/include/block/blockjob.h
@@ -33,7 +33,6 @@
#define BLOCK_JOB_SLICE_TIME 100000000ULL /* ns */
typedef struct BlockJobDriver BlockJobDriver;
-typedef struct JobTxn JobTxn;
/**
* BlockJob:
@@ -84,8 +83,6 @@ typedef struct BlockJob {
/** BlockDriverStates that are involved in this block job */
GSList *nodes;
-
- JobTxn *txn;
} BlockJob;
/**
@@ -153,22 +150,6 @@ void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp);
void block_job_cancel(BlockJob *job, bool force);
/**
- * block_job_finalize:
- * @job: The job to fully commit and finish.
- * @errp: Error object.
- *
- * For jobs that have finished their work and are pending
- * awaiting explicit acknowledgement to commit their work,
- * This will commit that work.
- *
- * FIXME: Make the below statement universally true:
- * For jobs that support the manual workflow mode, all graph
- * changes that occur as a result will occur after this command
- * and before a successful reply.
- */
-void block_job_finalize(BlockJob *job, Error **errp);
-
-/**
* block_job_dismiss:
* @job: The job to be dismissed.
* @errp: Error object.
@@ -260,41 +241,6 @@ int block_job_complete_sync(BlockJob *job, Error **errp);
void block_job_iostatus_reset(BlockJob *job);
/**
- * block_job_txn_new:
- *
- * Allocate and return a new block job transaction. Jobs can be added to the
- * transaction using block_job_txn_add_job().
- *
- * The transaction is automatically freed when the last job completes or is
- * cancelled.
- *
- * All jobs in the transaction either complete successfully or fail/cancel as a
- * group. Jobs wait for each other before completing. Cancelling one job
- * cancels all jobs in the transaction.
- */
-JobTxn *block_job_txn_new(void);
-
-/**
- * block_job_txn_unref:
- *
- * Release a reference that was previously acquired with block_job_txn_add_job
- * or block_job_txn_new. If it's the last reference to the object, it will be
- * freed.
- */
-void block_job_txn_unref(JobTxn *txn);
-
-/**
- * block_job_txn_add_job:
- * @txn: The transaction (may be NULL)
- * @job: Job to add to the transaction
- *
- * Add @job to the transaction. The @job must not already be in a transaction.
- * The caller must call either block_job_txn_unref() or block_job_completed()
- * to release the reference that is automatically grabbed here.
- */
-void block_job_txn_add_job(JobTxn *txn, BlockJob *job);
-
-/**
* block_job_is_internal:
* @job: The job to determine if it is user-visible or not.
*
diff --git a/include/block/blockjob_int.h b/include/block/blockjob_int.h
index ce66a9b..29a2802 100644
--- a/include/block/blockjob_int.h
+++ b/include/block/blockjob_int.h
@@ -38,16 +38,6 @@ struct BlockJobDriver {
/** Generic JobDriver callbacks and settings */
JobDriver job_driver;
- /**
- * If the callback is not NULL, prepare will be invoked when all the jobs
- * belonging to the same transaction complete; or upon this job's completion
- * if it is not in a transaction.
- *
- * This callback will not be invoked if the job has already failed.
- * If it fails, abort and then clean will be called.
- */
- int (*prepare)(BlockJob *job);
-
/*
* If the callback is not NULL, it will be invoked before the job is
* resumed in a new AioContext. This is the place to move any resources
diff --git a/include/qemu/job.h b/include/qemu/job.h
index d4aa7fa..39d74ab 100644
--- a/include/qemu/job.h
+++ b/include/qemu/job.h
@@ -32,6 +32,8 @@
#include "block/aio.h"
typedef struct JobDriver JobDriver;
+typedef struct JobTxn JobTxn;
+
/**
* Long-running operation.
@@ -133,6 +135,9 @@ typedef struct Job {
/** Element of the list of jobs */
QLIST_ENTRY(Job) job_list;
+ /** Transaction this job is part of */
+ JobTxn *txn;
+
/** Element of the list of jobs in a job transaction */
QLIST_ENTRY(Job) txn_list;
} Job;
@@ -184,6 +189,16 @@ struct JobDriver {
void (*drain)(Job *job);
/**
+ * If the callback is not NULL, prepare will be invoked when all the jobs
+ * belonging to the same transaction complete; or upon this job's completion
+ * if it is not in a transaction.
+ *
+ * This callback will not be invoked if the job has already failed.
+ * If it fails, abort and then clean will be called.
+ */
+ int (*prepare)(Job *job);
+
+ /**
* If the callback is not NULL, it will be invoked when all the jobs
* belonging to the same transaction complete; or upon this job's
* completion if it is not in a transaction. Skipped if NULL.
@@ -227,20 +242,52 @@ typedef enum JobCreateFlags {
JOB_MANUAL_DISMISS = 0x04,
} JobCreateFlags;
+/**
+ * Allocate and return a new job transaction. Jobs can be added to the
+ * transaction using job_txn_add_job().
+ *
+ * The transaction is automatically freed when the last job completes or is
+ * cancelled.
+ *
+ * All jobs in the transaction either complete successfully or fail/cancel as a
+ * group. Jobs wait for each other before completing. Cancelling one job
+ * cancels all jobs in the transaction.
+ */
+JobTxn *job_txn_new(void);
+
+/**
+ * Release a reference that was previously acquired with job_txn_add_job or
+ * job_txn_new. If it's the last reference to the object, it will be freed.
+ */
+void job_txn_unref(JobTxn *txn);
+
+/**
+ * @txn: The transaction (may be NULL)
+ * @job: Job to add to the transaction
+ *
+ * Add @job to the transaction. The @job must not already be in a transaction.
+ * The caller must call either job_txn_unref() or block_job_completed() to
+ * release the reference that is automatically grabbed here.
+ *
+ * If @txn is NULL, the function does nothing.
+ */
+void job_txn_add_job(JobTxn *txn, Job *job);
/**
* Create a new long-running job and return it.
*
* @job_id: The id of the newly-created job, or %NULL for internal jobs
* @driver: The class object for the newly-created job.
+ * @txn: The transaction this job belongs to, if any. %NULL otherwise.
* @ctx: The AioContext to run the job coroutine in.
* @flags: Creation flags for the job. See @JobCreateFlags.
* @cb: Completion function for the job.
* @opaque: Opaque pointer value passed to @cb.
* @errp: Error object.
*/
-void *job_create(const char *job_id, const JobDriver *driver, AioContext *ctx,
- int flags, BlockCompletionFunc *cb, void *opaque, Error **errp);
+void *job_create(const char *job_id, const JobDriver *driver, JobTxn *txn,
+ AioContext *ctx, int flags, BlockCompletionFunc *cb,
+ void *opaque, Error **errp);
/**
* Add a reference to Job refcnt, it will be decreased with job_unref, and then
@@ -260,9 +307,6 @@ void job_event_cancelled(Job *job);
/** To be called when a successfully completed job is finalised. */
void job_event_completed(Job *job);
-/** To be called when the job transitions to PENDING */
-void job_event_pending(Job *job);
-
/**
* Conditionally enter the job coroutine if the job is ready to run, not
* already busy and fn() returns true. fn() is called while under the job_lock
@@ -375,6 +419,16 @@ void job_early_fail(Job *job);
/** Asynchronously complete the specified @job. */
void job_complete(Job *job, Error **errp);;
+/**
+ * For a @job that has finished its work and is pending awaiting explicit
+ * acknowledgement to commit its work, this will commit that work.
+ *
+ * FIXME: Make the below statement universally true:
+ * For jobs that support the manual workflow mode, all graph changes that occur
+ * as a result will occur after this command and before a successful reply.
+ */
+void job_finalize(Job *job, Error **errp);
+
typedef void JobDeferToMainLoopFn(Job *job, void *opaque);
/**
@@ -407,10 +461,9 @@ void coroutine_fn job_do_yield(Job *job, uint64_t ns);
bool job_should_pause(Job *job);
bool job_started(Job *job);
void job_do_dismiss(Job *job);
-int job_finalize_single(Job *job);
void job_update_rc(Job *job);
-
-typedef struct BlockJob BlockJob;
-void block_job_txn_del_job(BlockJob *job);
+void job_cancel_async(Job *job, bool force);
+void job_completed_txn_abort(Job *job);
+void job_completed_txn_success(Job *job);
#endif
diff --git a/job.c b/job.c
index aa74b4c..4f6fd73 100644
--- a/job.c
+++ b/job.c
@@ -60,6 +60,19 @@ bool JobVerbTable[JOB_VERB__MAX][JOB_STATUS__MAX] = {
[JOB_VERB_DISMISS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0},
};
+/* Transactional group of jobs */
+struct JobTxn {
+
+ /* Is this txn being cancelled? */
+ bool aborting;
+
+ /* List of jobs */
+ QLIST_HEAD(, Job) jobs;
+
+ /* Reference count */
+ int refcnt;
+};
+
/* Right now, this mutex is only needed to synchronize accesses to job->busy
* and job->sleep_timer, such as concurrent calls to job_do_yield and
* job_enter. */
@@ -80,6 +93,71 @@ static void __attribute__((__constructor__)) job_init(void)
qemu_mutex_init(&job_mutex);
}
+JobTxn *job_txn_new(void)
+{
+ JobTxn *txn = g_new0(JobTxn, 1);
+ QLIST_INIT(&txn->jobs);
+ txn->refcnt = 1;
+ return txn;
+}
+
+static void job_txn_ref(JobTxn *txn)
+{
+ txn->refcnt++;
+}
+
+void job_txn_unref(JobTxn *txn)
+{
+ if (txn && --txn->refcnt == 0) {
+ g_free(txn);
+ }
+}
+
+void job_txn_add_job(JobTxn *txn, Job *job)
+{
+ if (!txn) {
+ return;
+ }
+
+ assert(!job->txn);
+ job->txn = txn;
+
+ QLIST_INSERT_HEAD(&txn->jobs, job, txn_list);
+ job_txn_ref(txn);
+}
+
+static void job_txn_del_job(Job *job)
+{
+ if (job->txn) {
+ QLIST_REMOVE(job, txn_list);
+ job_txn_unref(job->txn);
+ job->txn = NULL;
+ }
+}
+
+static int job_txn_apply(JobTxn *txn, int fn(Job *), bool lock)
+{
+ AioContext *ctx;
+ Job *job, *next;
+ int rc = 0;
+
+ QLIST_FOREACH_SAFE(job, &txn->jobs, txn_list, next) {
+ if (lock) {
+ ctx = job->aio_context;
+ aio_context_acquire(ctx);
+ }
+ rc = fn(job);
+ if (lock) {
+ aio_context_release(ctx);
+ }
+ if (rc) {
+ break;
+ }
+ }
+ return rc;
+}
+
+
/* TODO Make static once the whole state machine is in job.c */
void job_state_transition(Job *job, JobStatus s1)
{
@@ -181,8 +259,9 @@ static void job_sleep_timer_cb(void *opaque)
job_enter(job);
}
-void *job_create(const char *job_id, const JobDriver *driver, AioContext *ctx,
- int flags, BlockCompletionFunc *cb, void *opaque, Error **errp)
+void *job_create(const char *job_id, const JobDriver *driver, JobTxn *txn,
+ AioContext *ctx, int flags, BlockCompletionFunc *cb,
+ void *opaque, Error **errp)
{
Job *job;
@@ -228,6 +307,16 @@ void *job_create(const char *job_id, const JobDriver *driver, AioContext *ctx,
QLIST_INSERT_HEAD(&jobs, job, job_list);
+ /* Single jobs are modeled as single-job transactions for sake of
+ * consolidating the job management logic */
+ if (!txn) {
+ txn = job_txn_new();
+ job_txn_add_job(txn, job);
+ job_txn_unref(txn);
+ } else {
+ job_txn_add_job(txn, job);
+ }
+
return job;
}
@@ -241,6 +330,7 @@ void job_unref(Job *job)
if (--job->refcnt == 0) {
assert(job->status == JOB_STATUS_NULL);
assert(!timer_pending(&job->sleep_timer));
+ assert(!job->txn);
if (job->driver->free) {
job->driver->free(job);
@@ -263,7 +353,7 @@ void job_event_completed(Job *job)
notifier_list_notify(&job->on_finalize_completed, job);
}
-void job_event_pending(Job *job)
+static void job_event_pending(Job *job)
{
notifier_list_notify(&job->on_pending, job);
}
@@ -469,8 +559,7 @@ void job_do_dismiss(Job *job)
job->paused = false;
job->deferred_to_main_loop = true;
- /* TODO Don't assume it's a BlockJob */
- block_job_txn_del_job((BlockJob*) job);
+ job_txn_del_job(job);
job_state_transition(job, JOB_STATUS_NULL);
job_unref(job);
@@ -523,7 +612,7 @@ static void job_clean(Job *job)
}
}
-int job_finalize_single(Job *job)
+static int job_finalize_single(Job *job)
{
assert(job_is_completed(job));
@@ -550,12 +639,141 @@ int job_finalize_single(Job *job)
}
}
- /* TODO Don't assume it's a BlockJob */
- block_job_txn_del_job((BlockJob*) job);
+ job_txn_del_job(job);
job_conclude(job);
return 0;
}
+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;
+}
+
+void job_completed_txn_abort(Job *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;
+ 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_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);
+ }
+
+ job_txn_unref(txn);
+}
+
+static int job_prepare(Job *job)
+{
+ if (job->ret == 0 && job->driver->prepare) {
+ job->ret = job->driver->prepare(job);
+ }
+ return job->ret;
+}
+
+static int job_needs_finalize(Job *job)
+{
+ return !job->auto_finalize;
+}
+
+static void job_do_finalize(Job *job)
+{
+ int rc;
+ assert(job && job->txn);
+
+ /* prepare the transaction to complete */
+ rc = job_txn_apply(job->txn, job_prepare, true);
+ if (rc) {
+ job_completed_txn_abort(job);
+ } else {
+ job_txn_apply(job->txn, job_finalize_single, true);
+ }
+}
+
+void job_finalize(Job *job, Error **errp)
+{
+ assert(job && job->id);
+ if (job_apply_verb(job, JOB_VERB_FINALIZE, errp)) {
+ return;
+ }
+ job_do_finalize(job);
+}
+
+static int job_transition_to_pending(Job *job)
+{
+ job_state_transition(job, JOB_STATUS_PENDING);
+ if (!job->auto_finalize) {
+ job_event_pending(job);
+ }
+ return 0;
+}
+
+void job_completed_txn_success(Job *job)
+{
+ JobTxn *txn = job->txn;
+ Job *other_job;
+
+ job_state_transition(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);
+ }
+
+ job_txn_apply(txn, job_transition_to_pending, false);
+
+ /* If no jobs need manual finalization, automatically do so */
+ if (job_txn_apply(txn, job_needs_finalize, false) == 0) {
+ job_do_finalize(job);
+ }
+}
+
void job_complete(Job *job, Error **errp)
{
/* Should not be reachable via external interface for internal jobs */
diff --git a/tests/test-blockjob-txn.c b/tests/test-blockjob-txn.c
index ec5d592..6ee31d5 100644
--- a/tests/test-blockjob-txn.c
+++ b/tests/test-blockjob-txn.c
@@ -125,7 +125,7 @@ static void test_single_job(int expected)
JobTxn *txn;
int result = -EINPROGRESS;
- txn = block_job_txn_new();
+ txn = job_txn_new();
job = test_block_job_start(1, true, expected, &result, txn);
job_start(&job->job);
@@ -138,7 +138,7 @@ static void test_single_job(int expected)
}
g_assert_cmpint(result, ==, expected);
- block_job_txn_unref(txn);
+ job_txn_unref(txn);
}
static void test_single_job_success(void)
@@ -164,7 +164,7 @@ static void test_pair_jobs(int expected1, int expected2)
int result1 = -EINPROGRESS;
int result2 = -EINPROGRESS;
- txn = block_job_txn_new();
+ txn = job_txn_new();
job1 = test_block_job_start(1, true, expected1, &result1, txn);
job2 = test_block_job_start(2, true, expected2, &result2, txn);
job_start(&job1->job);
@@ -173,7 +173,7 @@ static void test_pair_jobs(int expected1, int expected2)
/* Release our reference now to trigger as many nice
* use-after-free bugs as possible.
*/
- block_job_txn_unref(txn);
+ job_txn_unref(txn);
if (expected1 == -ECANCELED) {
block_job_cancel(job1, false);
@@ -226,7 +226,7 @@ static void test_pair_jobs_fail_cancel_race(void)
int result1 = -EINPROGRESS;
int result2 = -EINPROGRESS;
- txn = block_job_txn_new();
+ txn = job_txn_new();
job1 = test_block_job_start(1, true, -ECANCELED, &result1, txn);
job2 = test_block_job_start(2, false, 0, &result2, txn);
job_start(&job1->job);
@@ -247,7 +247,7 @@ static void test_pair_jobs_fail_cancel_race(void)
g_assert_cmpint(result1, ==, -ECANCELED);
g_assert_cmpint(result2, ==, -ECANCELED);
- block_job_txn_unref(txn);
+ job_txn_unref(txn);
}
int main(int argc, char **argv)
diff --git a/tests/test-blockjob.c b/tests/test-blockjob.c
index e44c608..1e052c2 100644
--- a/tests/test-blockjob.c
+++ b/tests/test-blockjob.c
@@ -364,7 +364,7 @@ static void test_cancel_concluded(void)
}
assert(job->job.status == JOB_STATUS_PENDING);
- block_job_finalize(job, &error_abort);
+ job_finalize(&job->job, &error_abort);
assert(job->job.status == JOB_STATUS_CONCLUDED);
cancel_common(s);
--
1.8.3.1
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