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block: Mark block_job_add_bdrv() GRAPH_WRLOCK

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Instead of taking the writer lock internally, require callers to already
hold it when calling block_job_add_bdrv(). These callers will typically
already hold the graph lock once the locking work is completed, which
means that they can't call functions that take it internally.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20231027155333.420094-6-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-10-27 17:53:14 +02:00
parent 03b9eaca54
commit f3bbc53dc5
8 changed files with 45 additions and 15 deletions
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8
blockjob.c
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@ -248,10 +248,8 @@ int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
}
aio_context_acquire(ctx);
}
bdrv_graph_wrlock(bs);
c = bdrv_root_attach_child(bs, name, &child_job, 0, perm, shared_perm, job,
errp);
bdrv_graph_wrunlock();
if (need_context_ops) {
aio_context_release(ctx);
if (job->job.aio_context != qemu_get_aio_context()) {
@ -515,7 +513,8 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
BlockJob *job;
int ret;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
bdrv_graph_wrlock(bs);
if (job_id == NULL && !(flags & JOB_INTERNAL)) {
job_id = bdrv_get_device_name(bs);
@ -524,6 +523,7 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
job = job_create(job_id, &driver->job_driver, txn, bdrv_get_aio_context(bs),
flags, cb, opaque, errp);
if (job == NULL) {
bdrv_graph_wrunlock();
return NULL;
}
@ -563,9 +563,11 @@ void *block_job_create(const char *job_id, const BlockJobDriver *driver,
goto fail;
}
bdrv_graph_wrunlock();
return job;
fail:
bdrv_graph_wrunlock();
job_early_fail(&job->job);
return NULL;
}