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Re: [Qemu-block] [PATCH v5 07/12] block: Add "drained begin/end" for tra
From: |
Jeff Cody |
Subject: |
Re: [Qemu-block] [PATCH v5 07/12] block: Add "drained begin/end" for transactional backup |
Date: |
Wed, 21 Oct 2015 13:20:32 -0400 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Oct 21, 2015 at 10:06:44AM +0800, Fam Zheng wrote:
> This ensures the atomicity of the transaction by avoiding processing of
> external requests such as those from ioeventfd.
>
> Move the assignment to state->bs up right after bdrv_drained_begin, so
> that we can use it in the clean callback. The abort callback will still
> check bs->job and state->job, so it's OK.
>
> Signed-off-by: Fam Zheng <address@hidden>
> ---
> blockdev.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/blockdev.c b/blockdev.c
> index e4a5eb4..0a7848b 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -1684,9 +1684,16 @@ static void drive_backup_prepare(BlkTransactionState
> *common, Error **errp)
> return;
> }
>
> + if (!blk_is_available(blk)) {
> + error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device);
> + return;
> + }
> +
> /* AioContext is released in .clean() */
> state->aio_context = blk_get_aio_context(blk);
> aio_context_acquire(state->aio_context);
> + bdrv_drained_begin(blk_bs(blk));
> + state->bs = blk_bs(blk);
>
> qmp_drive_backup(backup->device, backup->target,
> backup->has_format, backup->format,
> @@ -1702,7 +1709,6 @@ static void drive_backup_prepare(BlkTransactionState
> *common, Error **errp)
> return;
> }
>
> - state->bs = blk_bs(blk);
> state->job = state->bs->job;
> }
>
> @@ -1722,6 +1728,7 @@ static void drive_backup_clean(BlkTransactionState
> *common)
> DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
>
> if (state->aio_context) {
> + bdrv_drained_end(state->bs);
> aio_context_release(state->aio_context);
> }
> }
> --
> 2.4.3
>
>
Reviewed-by: Jeff Cody <address@hidden>
- [Qemu-block] [PATCH v5 04/12] aio: introduce aio_{disable, enable}_external, (continued)
- [Qemu-block] [PATCH v5 05/12] block: Introduce "drained begin/end" API, Fam Zheng, 2015/10/20
- [Qemu-block] [PATCH v5 06/12] block: Add "drained begin/end" for transactional external snapshot, Fam Zheng, 2015/10/20
- [Qemu-block] [PATCH v5 07/12] block: Add "drained begin/end" for transactional backup, Fam Zheng, 2015/10/20
- Re: [Qemu-block] [PATCH v5 07/12] block: Add "drained begin/end" for transactional backup,
Jeff Cody <=
- [Qemu-block] [PATCH v5 08/12] block: Add "drained begin/end" for transactional blockdev-backup, Fam Zheng, 2015/10/20
- [Qemu-block] [PATCH v5 09/12] block: Add "drained begin/end" for internal snapshot, Fam Zheng, 2015/10/20
- [Qemu-block] [PATCH v5 10/12] block: Introduce BlockDriver.bdrv_drain callback, Fam Zheng, 2015/10/20
- [Qemu-block] [PATCH v5 11/12] qed: Implement .bdrv_drain, Fam Zheng, 2015/10/20