From 088ddadf21938cfa527bb47ce5452ad502ff2c8d Mon Sep 17 00:00:00 2001 From: John Snow Date: Wed, 18 Jul 2018 22:54:51 +0200 Subject: [PATCH 233/268] block: Honour BDRV_REQ_NO_SERIALISING in copy range RH-Author: John Snow Message-id: <20180718225511.14878-16-jsnow@redhat.com> Patchwork-id: 81402 O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 15/35] block: Honour BDRV_REQ_NO_SERIALISING in copy range Bugzilla: 1207657 RH-Acked-by: Eric Blake RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Fam Zheng From: Fam Zheng This semantics is needed by drive-backup so implement it before using this API there. Reviewed-by: Stefan Hajnoczi Signed-off-by: Fam Zheng Message-id: 20180703023758.14422-3-famz@redhat.com Signed-off-by: Jeff Cody (cherry picked from commit dee12de89380483656072f775f5ef99f4426f966) Signed-off-by: John Snow Signed-off-by: Miroslav Rezanina --- block/io.c | 6 ++++-- include/block/block.h | 5 +++-- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/block/io.c b/block/io.c index 7981239..b6754f3 100644 --- a/block/io.c +++ b/block/io.c @@ -2883,8 +2883,10 @@ 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, diff --git a/include/block/block.h b/include/block/block.h index c3cfb40..e1d5e47 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -636,13 +636,14 @@ 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. **/ -- 1.8.3.1