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Re: [Qemu-devel] [PATCH 03/11] blockjob: introduce block_job_early_fail
From: |
Jeff Cody |
Subject: |
Re: [Qemu-devel] [PATCH 03/11] blockjob: introduce block_job_early_fail |
Date: |
Tue, 9 May 2017 12:37:36 -0400 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Mon, May 08, 2017 at 04:13:02PM +0200, Paolo Bonzini wrote:
> Outside blockjob.c, block_job_unref is only used when a block job fails
> to start, and block_job_ref is not used at all. The reference counting
> thus is pretty well hidden. Introduce a separate function to be used
> by block jobs; because block_job_ref and block_job_unref now become
> static, move them earlier in blockjob.c.
>
> Reviewed-by: Stefan Hajnoczi <address@hidden>
> Reviewed-by: John Snow <address@hidden>
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
> block/backup.c | 2 +-
> block/commit.c | 2 +-
> block/mirror.c | 2 +-
> blockjob.c | 47
> ++++++++++++++++++++++++++------------------
> include/block/blockjob_int.h | 15 +++-----------
> tests/test-blockjob.c | 10 +++++-----
> 6 files changed, 39 insertions(+), 39 deletions(-)
>
> diff --git a/block/backup.c b/block/backup.c
> index a4fb2884f9..5387fbd84e 100644
> --- a/block/backup.c
> +++ b/block/backup.c
> @@ -692,7 +692,7 @@ BlockJob *backup_job_create(const char *job_id,
> BlockDriverState *bs,
> }
> if (job) {
> backup_clean(&job->common);
> - block_job_unref(&job->common);
> + block_job_early_fail(&job->common);
> }
>
> return NULL;
> diff --git a/block/commit.c b/block/commit.c
> index 91d2c344f6..99e41c6e50 100644
> --- a/block/commit.c
> +++ b/block/commit.c
> @@ -426,7 +426,7 @@ fail:
> if (commit_top_bs) {
> bdrv_set_backing_hd(overlay_bs, top, &error_abort);
> }
> - block_job_unref(&s->common);
> + block_job_early_fail(&s->common);
> }
>
>
> diff --git a/block/mirror.c b/block/mirror.c
> index 9f5eb692fd..6a6619ca71 100644
> --- a/block/mirror.c
> +++ b/block/mirror.c
> @@ -1252,7 +1252,7 @@ fail:
>
> g_free(s->replaces);
> blk_unref(s->target);
> - block_job_unref(&s->common);
> + block_job_early_fail(&s->common);
> }
>
> bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL,
> diff --git a/blockjob.c b/blockjob.c
> index 71187d0c9e..5a722c3635 100644
> --- a/blockjob.c
> +++ b/blockjob.c
> @@ -106,6 +106,32 @@ BlockJob *block_job_get(const char *id)
> return NULL;
> }
>
> +static void block_job_ref(BlockJob *job)
> +{
> + ++job->refcnt;
> +}
> +
> +static void block_job_attached_aio_context(AioContext *new_context,
> + void *opaque);
> +static void block_job_detach_aio_context(void *opaque);
> +
> +static void block_job_unref(BlockJob *job)
> +{
> + if (--job->refcnt == 0) {
> + BlockDriverState *bs = blk_bs(job->blk);
> + bs->job = NULL;
> + block_job_remove_all_bdrv(job);
> + blk_remove_aio_context_notifier(job->blk,
> + block_job_attached_aio_context,
> + block_job_detach_aio_context, job);
> + blk_unref(job->blk);
> + error_free(job->blocker);
> + g_free(job->id);
> + QLIST_REMOVE(job, job_list);
> + g_free(job);
> + }
> +}
> +
> static void block_job_attached_aio_context(AioContext *new_context,
> void *opaque)
> {
> @@ -293,26 +319,9 @@ void block_job_start(BlockJob *job)
> bdrv_coroutine_enter(blk_bs(job->blk), job->co);
> }
>
> -void block_job_ref(BlockJob *job)
> -{
> - ++job->refcnt;
> -}
> -
> -void block_job_unref(BlockJob *job)
> +void block_job_early_fail(BlockJob *job)
> {
> - if (--job->refcnt == 0) {
> - BlockDriverState *bs = blk_bs(job->blk);
> - bs->job = NULL;
> - block_job_remove_all_bdrv(job);
> - blk_remove_aio_context_notifier(job->blk,
> - block_job_attached_aio_context,
> - block_job_detach_aio_context, job);
> - blk_unref(job->blk);
> - error_free(job->blocker);
> - g_free(job->id);
> - QLIST_REMOVE(job, job_list);
> - g_free(job);
> - }
> + block_job_unref(job);
> }
>
> static void block_job_completed_single(BlockJob *job)
> diff --git a/include/block/blockjob_int.h b/include/block/blockjob_int.h
> index bfcc5d1241..45cdfd4ac1 100644
> --- a/include/block/blockjob_int.h
> +++ b/include/block/blockjob_int.h
> @@ -156,21 +156,12 @@ void block_job_sleep_ns(BlockJob *job, QEMUClockType
> type, int64_t ns);
> void block_job_yield(BlockJob *job);
>
> /**
> - * block_job_ref:
> + * block_job_early_fail:
> * @bs: The block device.
> *
> - * Grab a reference to the block job. Should be paired with block_job_unref.
> + * The block job could not be started, free it.
> */
> -void block_job_ref(BlockJob *job);
> -
> -/**
> - * block_job_unref:
> - * @bs: The block device.
> - *
> - * Release reference to the block job and release resources if it is the last
> - * reference.
> - */
> -void block_job_unref(BlockJob *job);
> +void block_job_early_fail(BlockJob *job);
>
> /**
> * block_job_completed:
> diff --git a/tests/test-blockjob.c b/tests/test-blockjob.c
> index 740e740398..23bdf1a932 100644
> --- a/tests/test-blockjob.c
> +++ b/tests/test-blockjob.c
> @@ -116,11 +116,11 @@ static void test_job_ids(void)
> job[1] = do_test_id(blk[1], "id0", false);
>
> /* But once job[0] finishes we can reuse its ID */
> - block_job_unref(job[0]);
> + block_job_early_fail(job[0]);
> job[1] = do_test_id(blk[1], "id0", true);
>
> /* No job ID specified, defaults to the backend name ('drive1') */
> - block_job_unref(job[1]);
> + block_job_early_fail(job[1]);
> job[1] = do_test_id(blk[1], NULL, true);
>
> /* Duplicate job ID */
> @@ -133,9 +133,9 @@ static void test_job_ids(void)
> /* This one is valid */
> job[2] = do_test_id(blk[2], "id_2", true);
>
> - block_job_unref(job[0]);
> - block_job_unref(job[1]);
> - block_job_unref(job[2]);
> + block_job_early_fail(job[0]);
> + block_job_early_fail(job[1]);
> + block_job_early_fail(job[2]);
>
> destroy_blk(blk[0]);
> destroy_blk(blk[1]);
> --
> 2.12.2
>
>
Reviewed-by: Jeff Cody <address@hidden>
- [Qemu-devel] [PATCH v2 00/11] Preparation for block job mutex, Paolo Bonzini, 2017/05/08
- [Qemu-devel] [PATCH 01/11] blockjob: remove unnecessary check, Paolo Bonzini, 2017/05/08
- [Qemu-devel] [PATCH 02/11] blockjob: remove iostatus_reset callback, Paolo Bonzini, 2017/05/08
- [Qemu-devel] [PATCH 03/11] blockjob: introduce block_job_early_fail, Paolo Bonzini, 2017/05/08
- Re: [Qemu-devel] [PATCH 03/11] blockjob: introduce block_job_early_fail,
Jeff Cody <=
- [Qemu-devel] [PATCH 04/11] blockjob: introduce block_job_pause/resume_all, Paolo Bonzini, 2017/05/08
- [Qemu-devel] [PATCH 06/11] blockjob: move iostatus reset inside block_job_user_resume, Paolo Bonzini, 2017/05/08
- [Qemu-devel] [PATCH 08/11] blockjob: group BlockJob transaction functions together, Paolo Bonzini, 2017/05/08
- [Qemu-devel] [PATCH 05/11] blockjob: separate monitor and blockjob APIs, Paolo Bonzini, 2017/05/08
- [Qemu-devel] [PATCH 07/11] blockjob: introduce block_job_cancel_async, check iostatus invariants, Paolo Bonzini, 2017/05/08
- [Qemu-devel] [PATCH 10/11] blockjob: reorganize block_job_completed_txn_abort, Paolo Bonzini, 2017/05/08