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block: Introduce "drained begin/end" API

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The semantics is that after bdrv_drained_begin(bs), bs will not get new external
requests until the matching bdrv_drained_end(bs).

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2015-10-23 11:08:09 +08:00 • committed by Kevin Wolf
parent c1e1e5fa8f
commit 51288d7917
3 changed files with 38 additions and 0 deletions
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2
include/block/block_int.h
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@ -448,6 +448,8 @@ struct BlockDriverState {
/* threshold limit for writes, in bytes. "High water mark". */
uint64_t write_threshold_offset;
NotifierWithReturn write_threshold_notifier;
int quiesce_counter;
};
struct BlockBackendRootState {