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From fba2d77758d680a147862f26d57bb984d73f7700 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Tue, 24 Jul 2018 12:43:07 +0200
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Subject: [PATCH 64/89] block: Move request tracking to children in copy
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offloading
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20180718225511.14878-14-jsnow@redhat.com>
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Patchwork-id: 81393
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 13/35] block: Move request tracking to children in copy offloading
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Bugzilla: 1207657
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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From: Fam Zheng <famz@redhat.com>
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in_flight and tracked requests need to be tracked in every layer during
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recursion. For now the only user is qemu-img convert where overlapping
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requests and IOThreads don't exist, therefore this change doesn't make
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much difference form user point of view, but it is incorrect as part of
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the API. Fix it.
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Reported-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 37aec7d75eb0d035a0db4f2cf9ad8b1b0c10f91b)
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Signed-off-by: John Snow <jsnow@redhat.com>
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---
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block/io.c | 60 +++++++++++++++++++++++++++++-------------------------------
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1 file changed, 29 insertions(+), 31 deletions(-)
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diff --git a/block/io.c b/block/io.c
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index ac36d1c..136a5d0 100644
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--- a/block/io.c
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+++ b/block/io.c
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@@ -2847,6 +2847,9 @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src,
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BdrvRequestFlags flags,
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bool recurse_src)
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{
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+ BdrvTrackedRequest src_req, dst_req;
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+ BlockDriverState *src_bs = src->bs;
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+ BlockDriverState *dst_bs = dst->bs;
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int ret;
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if (!src || !dst || !src->bs || !dst->bs) {
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@@ -2870,17 +2873,32 @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src,
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|| src->bs->encrypted || dst->bs->encrypted) {
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return -ENOTSUP;
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}
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+
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+ bdrv_inc_in_flight(src_bs);
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+ bdrv_inc_in_flight(dst_bs);
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+ tracked_request_begin(&src_req, src_bs, src_offset,
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+ bytes, BDRV_TRACKED_READ);
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+ tracked_request_begin(&dst_req, dst_bs, dst_offset,
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+ bytes, BDRV_TRACKED_WRITE);
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+
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+ wait_serialising_requests(&src_req);
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+ wait_serialising_requests(&dst_req);
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if (recurse_src) {
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- return src->bs->drv->bdrv_co_copy_range_from(src->bs,
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- src, src_offset,
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- dst, dst_offset,
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- bytes, flags);
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+ ret = src->bs->drv->bdrv_co_copy_range_from(src->bs,
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+ src, src_offset,
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+ dst, dst_offset,
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+ bytes, flags);
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} else {
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- return dst->bs->drv->bdrv_co_copy_range_to(dst->bs,
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- src, src_offset,
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- dst, dst_offset,
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- bytes, flags);
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+ ret = dst->bs->drv->bdrv_co_copy_range_to(dst->bs,
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+ src, src_offset,
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+ dst, dst_offset,
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+ bytes, flags);
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}
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+ tracked_request_end(&src_req);
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+ tracked_request_end(&dst_req);
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+ bdrv_dec_in_flight(src_bs);
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+ bdrv_dec_in_flight(dst_bs);
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+ return ret;
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}
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/* Copy range from @src to @dst.
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@@ -2911,29 +2929,9 @@ int coroutine_fn bdrv_co_copy_range(BdrvChild *src, uint64_t src_offset,
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BdrvChild *dst, uint64_t dst_offset,
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uint64_t bytes, BdrvRequestFlags flags)
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{
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- BdrvTrackedRequest src_req, dst_req;
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- BlockDriverState *src_bs = src->bs;
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- BlockDriverState *dst_bs = dst->bs;
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- int ret;
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-
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- bdrv_inc_in_flight(src_bs);
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- bdrv_inc_in_flight(dst_bs);
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- tracked_request_begin(&src_req, src_bs, src_offset,
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- bytes, BDRV_TRACKED_READ);
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- tracked_request_begin(&dst_req, dst_bs, dst_offset,
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- bytes, BDRV_TRACKED_WRITE);
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-
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- wait_serialising_requests(&src_req);
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- wait_serialising_requests(&dst_req);
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- ret = bdrv_co_copy_range_from(src, src_offset,
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- dst, dst_offset,
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- bytes, flags);
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-
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- tracked_request_end(&src_req);
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- tracked_request_end(&dst_req);
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- bdrv_dec_in_flight(src_bs);
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- bdrv_dec_in_flight(dst_bs);
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- return ret;
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+ return bdrv_co_copy_range_from(src, src_offset,
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+ dst, dst_offset,
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+ bytes, flags);
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}
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static void bdrv_parent_cb_resize(BlockDriverState *bs)
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--
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1.8.3.1
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