From 04abeb0ef2f62cf5eb252672afef623d9cc99545 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Tue, 26 Jun 2018 09:48:03 +0200
Subject: [PATCH 095/268] job: Maintain a list of all jobs
RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <20180626094856.6924-21-kwolf@redhat.com>
Patchwork-id: 81105
O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH v2 20/73] job: Maintain a list of all jobs
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 job list from BlockJob to Job. Now we can check for
duplicate IDs in job_create().
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
(cherry picked from commit e7c1d78bbd5867804debeb7159b137fd9a6c44d3)
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
blockjob.c | 46 ++++++++++++++++++++++++----------------------
include/block/blockjob.h | 3 ---
include/qemu/job.h | 19 +++++++++++++++++++
job.c | 31 +++++++++++++++++++++++++++++++
4 files changed, 74 insertions(+), 25 deletions(-)
diff --git a/blockjob.c b/blockjob.c
index 430a67b..c69b2e7 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -129,8 +129,6 @@ struct BlockJobTxn {
int refcnt;
};
-static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs);
-
/*
* The block job API is composed of two categories of functions.
*
@@ -146,25 +144,34 @@ static QLIST_HEAD(, BlockJob) block_jobs = QLIST_HEAD_INITIALIZER(block_jobs);
* blockjob_int.h.
*/
-BlockJob *block_job_next(BlockJob *job)
+static bool is_block_job(Job *job)
{
- if (!job) {
- return QLIST_FIRST(&block_jobs);
- }
- return QLIST_NEXT(job, job_list);
+ 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)
{
- BlockJob *job;
+ Job *job = job_get(id);
- QLIST_FOREACH(job, &block_jobs, job_list) {
- if (job->job.id && !strcmp(id, job->job.id)) {
- return job;
- }
+ if (job && is_block_job(job)) {
+ return container_of(job, BlockJob, job);
+ } else {
+ return NULL;
}
-
- return NULL;
}
BlockJobTxn *block_job_txn_new(void)
@@ -253,7 +260,6 @@ void block_job_unref(BlockJob *job)
assert(job->status == BLOCK_JOB_STATUS_NULL);
assert(!job->txn);
BlockDriverState *bs = blk_bs(job->blk);
- QLIST_REMOVE(job, job_list);
bs->job = NULL;
block_job_remove_all_bdrv(job);
blk_remove_aio_context_notifier(job->blk,
@@ -812,7 +818,7 @@ void block_job_cancel_sync_all(void)
BlockJob *job;
AioContext *aio_context;
- while ((job = QLIST_FIRST(&block_jobs))) {
+ while ((job = block_job_next(NULL))) {
aio_context = blk_get_aio_context(job->blk);
aio_context_acquire(aio_context);
block_job_cancel_sync(job);
@@ -942,10 +948,6 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
error_setg(errp, "Cannot specify job ID for internal block job");
return NULL;
}
- if (block_job_get(job_id)) {
- error_setg(errp, "Job ID '%s' already in use", job_id);
- return NULL;
- }
}
blk = blk_new(perm, shared_perm);
@@ -961,6 +963,8 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
return NULL;
}
+ assert(is_block_job(&job->job));
+
job->driver = driver;
job->blk = blk;
job->cb = cb;
@@ -983,8 +987,6 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
- QLIST_INSERT_HEAD(&block_jobs, job, job_list);
-
blk_add_aio_context_notifier(blk, block_job_attached_aio_context,
block_job_detach_aio_context, job);
diff --git a/include/block/blockjob.h b/include/block/blockjob.h
index 640e649..10bd9f7 100644
--- a/include/block/blockjob.h
+++ b/include/block/blockjob.h
@@ -105,9 +105,6 @@ typedef struct BlockJob {
*/
bool deferred_to_main_loop;
- /** Element of the list of block jobs */
- QLIST_ENTRY(BlockJob) job_list;
-
/** Status that is published by the query-block-jobs QMP API */
BlockDeviceIoStatus iostatus;
diff --git a/include/qemu/job.h b/include/qemu/job.h
index 43dc2e4..bae2b09 100644
--- a/include/qemu/job.h
+++ b/include/qemu/job.h
@@ -27,6 +27,7 @@
#define JOB_H
#include "qapi/qapi-types-block-core.h"
+#include "qemu/queue.h"
typedef struct JobDriver JobDriver;
@@ -39,6 +40,9 @@ typedef struct Job {
/** The type of this job. */
const JobDriver *driver;
+
+ /** Element of the list of jobs */
+ QLIST_ENTRY(Job) job_list;
} Job;
/**
@@ -71,4 +75,19 @@ JobType job_type(const Job *job);
/** Returns the enum string for the JobType of a given Job. */
const char *job_type_str(const Job *job);
+/**
+ * Get the next element from the list of block jobs after @job, or the
+ * first one if @job is %NULL.
+ *
+ * Returns the requested job, or %NULL if there are no more jobs left.
+ */
+Job *job_next(Job *job);
+
+/**
+ * Get the job identified by @id (which must not be %NULL).
+ *
+ * Returns the requested job, or %NULL if it doesn't exist.
+ */
+Job *job_get(const char *id);
+
#endif
diff --git a/job.c b/job.c
index cfdd008..e57303c 100644
--- a/job.c
+++ b/job.c
@@ -29,6 +29,8 @@
#include "qemu/job.h"
#include "qemu/id.h"
+static QLIST_HEAD(, Job) jobs = QLIST_HEAD_INITIALIZER(jobs);
+
JobType job_type(const Job *job)
{
return job->driver->job_type;
@@ -39,6 +41,27 @@ const char *job_type_str(const Job *job)
return JobType_str(job_type(job));
}
+Job *job_next(Job *job)
+{
+ if (!job) {
+ return QLIST_FIRST(&jobs);
+ }
+ return QLIST_NEXT(job, job_list);
+}
+
+Job *job_get(const char *id)
+{
+ Job *job;
+
+ QLIST_FOREACH(job, &jobs, job_list) {
+ if (job->id && !strcmp(id, job->id)) {
+ return job;
+ }
+ }
+
+ return NULL;
+}
+
void *job_create(const char *job_id, const JobDriver *driver, Error **errp)
{
Job *job;
@@ -48,17 +71,25 @@ void *job_create(const char *job_id, const JobDriver *driver, Error **errp)
error_setg(errp, "Invalid job ID '%s'", job_id);
return NULL;
}
+ if (job_get(job_id)) {
+ error_setg(errp, "Job ID '%s' already in use", job_id);
+ return NULL;
+ }
}
job = g_malloc0(driver->instance_size);
job->driver = driver;
job->id = g_strdup(job_id);
+ QLIST_INSERT_HEAD(&jobs, job, job_list);
+
return job;
}
void job_delete(Job *job)
{
+ QLIST_REMOVE(job, job_list);
+
g_free(job->id);
g_free(job);
}
--
1.8.3.1