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block: Add "drained begin/end" for transactional backup

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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 <famz@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2015-10-23 11:08:11 +08:00 committed by Kevin Wolf
parent da763e8301
commit 1fdd4b7be3
1 changed files with 8 additions and 1 deletions
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9
blockdev.c
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@ -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);
}
}