From: Stefan Hajnoczi <stefanha@redhat.com>
To: Fam Zheng <famz@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Jeff Cody <jcody@redhat.com>,
qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>,
vsementsov@parallels.com, John Snow <jsnow@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v3 06/15] blockjob: Add .txn_commit and .txn_abort transaction actions
Date: Tue, 14 Jul 2015 09:35:54 +0100 [thread overview]
Message-ID: <20150714083554.GD17927@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <1436500012-32593-7-git-send-email-famz@redhat.com>
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On Fri, Jul 10, 2015 at 11:46:43AM +0800, Fam Zheng wrote:
> They will be called if the job is part of a transaction, after all jobs in a
> transaction are completed or cancelled, before calling job->cb().
>
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
> include/block/blockjob.h | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/include/block/blockjob.h b/include/block/blockjob.h
> index dd9d5e6..a7b7f66 100644
> --- a/include/block/blockjob.h
> +++ b/include/block/blockjob.h
> @@ -50,6 +50,18 @@ typedef struct BlockJobDriver {
> * manually.
> */
> void (*complete)(BlockJob *job, Error **errp);
> +
> + /**
> + * Optional callback for job types that can be in a transaction. Called
> + * when the transaction succeeds.
> + */
> + void (*txn_commit)(BlockJob *job);
> +
> + /**
> + * Optional callback for job types that can be in a transaction. Call when
> + * the transaction fails.
> + */
> + void (*txn_abort)(BlockJob *job);
> } BlockJobDriver;
The semantics of transactions aren't fully documented. My understanding
is that you want:
1. either .txn_commit() or .txn_abort() to be called
2. after all jobs complete (due to success, error, or cancellation).
These two points are important for understanding these interfaces.
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next prev parent reply other threads:[~2015-07-14 8:36 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-10 3:46 [Qemu-devel] [PATCH v3 00/15] block: incremental backup transactions using BlockJobTxn Fam Zheng
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 01/15] qapi: Add transaction support to block-dirty-bitmap operations Fam Zheng
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 02/15] iotests: add transactional incremental backup test Fam Zheng
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 03/15] block: rename BlkTransactionState and BdrvActionOps Fam Zheng
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 04/15] block: keep bitmap if incremental backup job is cancelled Fam Zheng
2015-07-13 19:48 ` John Snow
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 05/15] backup: Extract dirty bitmap handling as a separate function Fam Zheng
2015-07-13 23:06 ` John Snow
2015-07-14 2:46 ` Fam Zheng
2015-07-14 8:26 ` Stefan Hajnoczi
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 06/15] blockjob: Add .txn_commit and .txn_abort transaction actions Fam Zheng
2015-07-13 23:06 ` John Snow
2015-07-14 8:35 ` Stefan Hajnoczi [this message]
2015-07-14 9:26 ` Fam Zheng
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 07/15] blockjob: Add "completed" and "ret" in BlockJob Fam Zheng
2015-07-13 23:08 ` John Snow
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 08/15] blockjob: Simplify block_job_finish_sync Fam Zheng
2015-07-13 23:08 ` John Snow
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 09/15] blockjob: Move BlockJobDeferToMainLoopData into BlockJob Fam Zheng
2015-07-14 10:03 ` Stefan Hajnoczi
2015-07-14 10:36 ` Fam Zheng
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 10/15] block: add block job transactions Fam Zheng
2015-07-13 23:12 ` John Snow
2015-07-14 3:04 ` Fam Zheng
2015-07-14 15:05 ` John Snow
2015-07-14 10:27 ` Stefan Hajnoczi
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 11/15] blockdev: make BlockJobTxn available to qmp 'transaction' Fam Zheng
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 12/15] block/backup: support block job transactions Fam Zheng
2015-07-13 23:14 ` John Snow
2015-07-14 3:12 ` Fam Zheng
2015-07-14 10:32 ` Stefan Hajnoczi
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 13/15] iotests: 124 - transactional failure test Fam Zheng
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 14/15] qmp-commands.hx: Update the supported 'transaction' operations Fam Zheng
2015-07-10 3:46 ` [Qemu-devel] [PATCH v3 15/15] tests: add BlockJobTxn unit test Fam Zheng
2015-07-13 23:14 ` John Snow
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