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Re: [Qemu-block] [PATCH] job: drop job_drain
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From: |
Vladimir Sementsov-Ogievskiy |
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Subject: |
Re: [Qemu-block] [PATCH] job: drop job_drain |
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Date: |
Fri, 16 Aug 2019 17:13:25 +0000 |
16.08.2019 20:10, Vladimir Sementsov-Ogievskiy wrote:
> 16.08.2019 20:04, Vladimir Sementsov-Ogievskiy wrote:
>> In job_finish_sync job_enter should be enough for a job to make some
>> progress and draining is a wrong tool for it. So use job_enter directly
>> here and drop job_drain with all related staff not used more.
>>
>> Suggested-by: Kevin Wolf <address@hidden>
>> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
>> ---
>>
>> It's a continuation for
>> [PATCH v4] blockjob: drain all job nodes in block_job_drain
>>
>> include/block/blockjob_int.h | 19 -------------------
>> include/qemu/job.h | 13 -------------
>> block/backup.c | 19 +------------------
>> block/commit.c | 1 -
>> block/mirror.c | 28 +++-------------------------
>> block/stream.c | 1 -
>> blockjob.c | 13 -------------
>> job.c | 12 +-----------
>> 8 files changed, 5 insertions(+), 101 deletions(-)
>>
>> diff --git a/include/block/blockjob_int.h b/include/block/blockjob_int.h
>> index e4a318dd15..e2824a36a8 100644
>> --- a/include/block/blockjob_int.h
>> +++ b/include/block/blockjob_int.h
>> @@ -52,17 +52,6 @@ struct BlockJobDriver {
>> * besides job->blk to the new AioContext.
>> */
>> void (*attached_aio_context)(BlockJob *job, AioContext *new_context);
>> -
>> - /*
>> - * If the callback is not NULL, it will be invoked when the job has to
>> be
>> - * synchronously cancelled or completed; it should drain
>> BlockDriverStates
>> - * as required to ensure progress.
>> - *
>> - * Block jobs must use the default implementation for job_driver.drain,
>> - * which will in turn call this callback after doing generic block job
>> - * stuff.
>> - */
>> - void (*drain)(BlockJob *job);
>> };
>> /**
>> @@ -107,14 +96,6 @@ void block_job_free(Job *job);
>> */
>> void block_job_user_resume(Job *job);
>> -/**
>> - * block_job_drain:
>> - * Callback to be used for JobDriver.drain in all block jobs. Drains the
>> main
>> - * block node associated with the block jobs and calls BlockJobDriver.drain
>> for
>> - * job-specific actions.
>> - */
>> -void block_job_drain(Job *job);
>> -
>> /**
>> * block_job_ratelimit_get_delay:
>> *
>> diff --git a/include/qemu/job.h b/include/qemu/job.h
>> index 9e7cd1e4a0..09739b8dd9 100644
>> --- a/include/qemu/job.h
>> +++ b/include/qemu/job.h
>> @@ -220,13 +220,6 @@ struct JobDriver {
>> */
>> void (*complete)(Job *job, Error **errp);
>> - /*
>> - * If the callback is not NULL, it will be invoked when the job has to
>> be
>> - * synchronously cancelled or completed; it should drain any activities
>> - * as required to ensure progress.
>> - */
>> - 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
>> @@ -470,12 +463,6 @@ bool job_user_paused(Job *job);
>> */
>> void job_user_resume(Job *job, Error **errp);
>> -/*
>> - * Drain any activities as required to ensure progress. This can be called
>> in a
>> - * loop to synchronously complete a job.
>> - */
>> -void job_drain(Job *job);
>> -
>> /**
>> * Get the next element from the list of block jobs after @job, or the
>> * first one if @job is %NULL.
>> diff --git a/block/backup.c b/block/backup.c
>> index 715e1d3be8..d1ecdfa9aa 100644
>> --- a/block/backup.c
>> +++ b/block/backup.c
>> @@ -320,21 +320,6 @@ void backup_do_checkpoint(BlockJob *job, Error **errp)
>> hbitmap_set(backup_job->copy_bitmap, 0, backup_job->len);
>> }
>> -static void backup_drain(BlockJob *job)
>> -{
>> - BackupBlockJob *s = container_of(job, BackupBlockJob, common);
>> -
>> - /* Need to keep a reference in case blk_drain triggers execution
>> - * of backup_complete...
>> - */
>> - if (s->target) {
>> - BlockBackend *target = s->target;
>> - blk_ref(target);
>> - blk_drain(target);
>> - blk_unref(target);
>> - }
>> -}
>> -
>> static BlockErrorAction backup_error_action(BackupBlockJob *job,
>> bool read, int error)
>> {
>> @@ -488,13 +473,11 @@ static const BlockJobDriver backup_job_driver = {
>> .job_type = JOB_TYPE_BACKUP,
>> .free = block_job_free,
>> .user_resume = block_job_user_resume,
>> - .drain = block_job_drain,
>> .run = backup_run,
>> .commit = backup_commit,
>> .abort = backup_abort,
>> .clean = backup_clean,
>> - },
>> - .drain = backup_drain,
>> + }
>> };
>> static int64_t backup_calculate_cluster_size(BlockDriverState *target,
>> diff --git a/block/commit.c b/block/commit.c
>> index 2c5a6d4ebc..697a779d8e 100644
>> --- a/block/commit.c
>> +++ b/block/commit.c
>> @@ -216,7 +216,6 @@ static const BlockJobDriver commit_job_driver = {
>> .job_type = JOB_TYPE_COMMIT,
>> .free = block_job_free,
>> .user_resume = block_job_user_resume,
>> - .drain = block_job_drain,
>> .run = commit_run,
>> .prepare = commit_prepare,
>> .abort = commit_abort,
>> diff --git a/block/mirror.c b/block/mirror.c
>> index 8cb75fb409..b91abe0288 100644
>> --- a/block/mirror.c
>> +++ b/block/mirror.c
>> @@ -644,14 +644,11 @@ static int mirror_exit_common(Job *job)
>> bdrv_ref(mirror_top_bs);
>> bdrv_ref(target_bs);
>> - /* Remove target parent that still uses BLK_PERM_WRITE/RESIZE before
>> + /*
>> + * Remove target parent that still uses BLK_PERM_WRITE/RESIZE before
>> * inserting target_bs at s->to_replace, where we might not be able to
>> get
>> * these permissions.
>> - *
>> - * Note that blk_unref() alone doesn't necessarily drop permissions
>> because
>> - * we might be running nested inside mirror_drain(), which takes an
>> extra
>> - * reference, so use an explicit blk_set_perm() first. */
>> - blk_set_perm(s->target, 0, BLK_PERM_ALL, &error_abort);
>> + */
>
> Somehow this hunk lives here from the very beginning of this patch versioning,
> but nobody noticed it. I'll resend.
Ah no, it's OK, as mirror_drain don't exists now.
--
Best regards,
Vladimir