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block: Honour BDRV_REQ_NO_SERIALISING in copy range 

This semantics is needed by drive-backup so implement it before using
this API there.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 20180703023758.14422-3-famz@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
master
Fam Zheng 2018-07-03 10:37:57 +08:00 committed by Jeff Cody
parent d4d3e5a0d5
commit dee12de893
2 changed files with 7 additions and 4 deletions
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6
block/io.c
View File

@ -2930,8 +2930,10 @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src,
tracked_request_begin(&dst_req, dst->bs, dst_offset,
bytes, BDRV_TRACKED_WRITE);
wait_serialising_requests(&src_req);
wait_serialising_requests(&dst_req);
if (!(flags & BDRV_REQ_NO_SERIALISING)) {
wait_serialising_requests(&src_req);
wait_serialising_requests(&dst_req);
}
if (recurse_src) {
ret = src->bs->drv->bdrv_co_copy_range_from(src->bs,
src, src_offset,

5
include/block/block.h
View File

@ -659,13 +659,14 @@ void bdrv_unregister_buf(BlockDriverState *bs, void *host);
* @dst: Destination child to copy data to
* @dst_offset: offset in @dst image to write data
* @bytes: number of bytes to copy
* @flags: request flags. Must be one of:
* 0 - actually read data from src;
* @flags: request flags. Supported flags:
* BDRV_REQ_ZERO_WRITE - treat the @src range as zero data and do zero
* write on @dst as if bdrv_co_pwrite_zeroes is
* called. Used to simplify caller code, or
* during BlockDriver.bdrv_co_copy_range_from()
* recursion.
* BDRV_REQ_NO_SERIALISING - do not serialize with other overlapping
* requests currently in flight.
*
* Returns: 0 if succeeded; negative error code if failed.
**/