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jobs: group together API calls under the same job lock

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Now that the API offers also _locked() functions, take advantage
of it and give also the caller control to take the lock and call
_locked functions.

This makes sense especially when we have for loops, because it
makes no sense to have:

for(job = job_next(); ...)

where each job_next() takes the lock internally.
Instead we want

JOB_LOCK_GUARD();
for(job = job_next_locked(); ...)

In addition, protect also direct field accesses, by either creating a
new critical section or widening the existing ones.

Note: at this stage, job_{lock/unlock} and job lock guard macros
are *nop*.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-Id: <20220926093214.506243-12-eesposit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito
2022-10-07 12:11:41 +02:00
committed by Kevin Wolf
parent 279ac06e55
commit 880eeec613
6 changed files with 63 additions and 34 deletions
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blockdev.c
+10 -4
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@@ -150,12 +150,15 @@ void blockdev_mark_auto_del(BlockBackend *blk)
return;
}
for (job = block_job_next(NULL); job; job = block_job_next(job)) {
JOB_LOCK_GUARD();
for (job = block_job_next_locked(NULL); job;
job = block_job_next_locked(job)) {
if (block_job_has_bdrv(job, blk_bs(blk))) {
AioContext *aio_context = job->job.aio_context;
aio_context_acquire(aio_context);
job_cancel(&job->job, false);
job_cancel_locked(&job->job, false);
aio_context_release(aio_context);
}
@@ -3756,7 +3759,10 @@ BlockJobInfoList *qmp_query_block_jobs(Error **errp)
BlockJobInfoList *head = NULL, **tail = &head;
BlockJob *job;
for (job = block_job_next(NULL); job; job = block_job_next(job)) {
JOB_LOCK_GUARD();
for (job = block_job_next_locked(NULL); job;
job = block_job_next_locked(job)) {
BlockJobInfo *value;
AioContext *aio_context;
@@ -3765,7 +3771,7 @@ BlockJobInfoList *qmp_query_block_jobs(Error **errp)
}
aio_context = block_job_get_aio_context(job);
aio_context_acquire(aio_context);
value = block_job_query(job, errp);
value = block_job_query_locked(job, errp);
aio_context_release(aio_context);
if (!value) {
qapi_free_BlockJobInfoList(head);