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block-backend: Add blk_co_copy_range 

It's a BlockBackend wrapper of the BDS interface.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20180601092648.24614-10-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Fam Zheng 2018-06-01 17:26:47 +08:00 committed by Stefan Hajnoczi
parent 604dfaaa32
commit b5679fa49c
2 changed files with 22 additions and 0 deletions
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18
block/block-backend.c
View File

@ -2211,3 +2211,21 @@ void blk_unregister_buf(BlockBackend *blk, void *host)
{
bdrv_unregister_buf(blk_bs(blk), host);
}
int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
BlockBackend *blk_out, int64_t off_out,
int bytes, BdrvRequestFlags flags)
{
int r;
r = blk_check_byte_request(blk_in, off_in, bytes);
if (r) {
return r;
}
r = blk_check_byte_request(blk_out, off_out, bytes);
if (r) {
return r;
}
return bdrv_co_copy_range(blk_in->root, off_in,
blk_out->root, off_out,
bytes, flags);
}

4
include/sysemu/block-backend.h
View File

@ -232,4 +232,8 @@ void blk_set_force_allow_inactivate(BlockBackend *blk);
void blk_register_buf(BlockBackend *blk, void *host, size_t size);
void blk_unregister_buf(BlockBackend *blk, void *host);
int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
BlockBackend *blk_out, int64_t off_out,
int bytes, BdrvRequestFlags flags);
#endif