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block: Move request tracking to children in copy offloading 

in_flight and tracked requests need to be tracked in every layer during
recursion. For now the only user is qemu-img convert where overlapping
requests and IOThreads don't exist, therefore this change doesn't make
much difference form user point of view, but it is incorrect as part of
the API. Fix it.

Reported-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2018-06-27 11:57:52 +08:00 committed by Kevin Wolf
parent 354d930dc6
commit 37aec7d75e
1 changed files with 28 additions and 31 deletions
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59
block/io.c
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@ -2932,6 +2932,9 @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src,
BdrvRequestFlags flags,
bool recurse_src)
{
BdrvTrackedRequest src_req, dst_req;
BlockDriverState *src_bs = src->bs;
BlockDriverState *dst_bs = dst->bs;
int ret;
if (!src || !dst || !src->bs || !dst->bs) {
@ -2955,17 +2958,31 @@ static int coroutine_fn bdrv_co_copy_range_internal(BdrvChild *src,
|| src->bs->encrypted || dst->bs->encrypted) {
return -ENOTSUP;
}
bdrv_inc_in_flight(src_bs);
bdrv_inc_in_flight(dst_bs);
tracked_request_begin(&src_req, src_bs, src_offset,
bytes, BDRV_TRACKED_READ);
tracked_request_begin(&dst_req, dst_bs, dst_offset,
bytes, BDRV_TRACKED_WRITE);
wait_serialising_requests(&src_req);
wait_serialising_requests(&dst_req);
if (recurse_src) {
return src->bs->drv->bdrv_co_copy_range_from(src->bs,
src, src_offset,
dst, dst_offset,
bytes, flags);
ret = src->bs->drv->bdrv_co_copy_range_from(src->bs,
src, src_offset,
dst, dst_offset,
bytes, flags);
} else {
return dst->bs->drv->bdrv_co_copy_range_to(dst->bs,
src, src_offset,
dst, dst_offset,
bytes, flags);
ret = dst->bs->drv->bdrv_co_copy_range_to(dst->bs,
src, src_offset,
dst, dst_offset,
bytes, flags);
}
tracked_request_end(&src_req);
tracked_request_end(&dst_req);
bdrv_dec_in_flight(src_bs);
bdrv_dec_in_flight(dst_bs);
return ret;
}
/* Copy range from @src to @dst.
@ -2996,29 +3013,9 @@ int coroutine_fn bdrv_co_copy_range(BdrvChild *src, uint64_t src_offset,
BdrvChild *dst, uint64_t dst_offset,
uint64_t bytes, BdrvRequestFlags flags)
{
BdrvTrackedRequest src_req, dst_req;
BlockDriverState *src_bs = src->bs;
BlockDriverState *dst_bs = dst->bs;
int ret;
bdrv_inc_in_flight(src_bs);
bdrv_inc_in_flight(dst_bs);
tracked_request_begin(&src_req, src_bs, src_offset,
bytes, BDRV_TRACKED_READ);
tracked_request_begin(&dst_req, dst_bs, dst_offset,
bytes, BDRV_TRACKED_WRITE);
wait_serialising_requests(&src_req);
wait_serialising_requests(&dst_req);
ret = bdrv_co_copy_range_from(src, src_offset,
dst, dst_offset,
bytes, flags);
tracked_request_end(&src_req);
tracked_request_end(&dst_req);
bdrv_dec_in_flight(src_bs);
bdrv_dec_in_flight(dst_bs);
return ret;
return bdrv_co_copy_range_from(src, src_offset,
dst, dst_offset,
bytes, flags);
}
static void bdrv_parent_cb_resize(BlockDriverState *bs)