From ff52bf36a3a6c63b7528fbe64e9ed9976b221e68 Mon Sep 17 00:00:00 2001 From: Fam Zheng Date: Fri, 23 Oct 2015 11:08:12 +0800 Subject: [PATCH] block: Add "drained begin/end" for transactional blockdev-backup Similar to the previous patch, make sure that external events are not dispatched during transaction operations. Signed-off-by: Fam Zheng Reviewed-by: Jeff Cody Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- blockdev.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/blockdev.c b/blockdev.c index 0a7848bd66..52f44b2867 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1756,6 +1756,11 @@ static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) return; } + if (!blk_is_available(blk)) { + error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, backup->device); + return; + } + target = blk_by_name(backup->target); if (!target) { error_setg(errp, "Device '%s' not found", backup->target); @@ -1770,6 +1775,8 @@ static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) return; } aio_context_acquire(state->aio_context); + state->bs = blk_bs(blk); + bdrv_drained_begin(state->bs); qmp_blockdev_backup(backup->device, backup->target, backup->sync, @@ -1782,7 +1789,6 @@ static void blockdev_backup_prepare(BlkTransactionState *common, Error **errp) return; } - state->bs = blk_bs(blk); state->job = state->bs->job; } @@ -1802,6 +1808,7 @@ static void blockdev_backup_clean(BlkTransactionState *common) BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common); if (state->aio_context) { + bdrv_drained_end(state->bs); aio_context_release(state->aio_context); } } -- 2.11.4.GIT