From 5636da76824bf34ddb73212334124a5f5b3b3320 Mon Sep 17 00:00:00 2001 From: Dongli Zhang Date: Wed, 7 Nov 2018 00:09:16 +0800 Subject: [PATCH 1/2] virtio-blk: rename iov to out_iov in virtio_blk_handle_request() In virtio_blk_handle_request(), in_iov is used for input header while iov is used for output header. Rename iov to out_iov to pair output header's name with in_iov to avoid confusing people when reading source code. Signed-off-by: Dongli Zhang Message-id: 1541520556-8334-1-git-send-email-dongli.zhang@oracle.com Signed-off-by: Stefan Hajnoczi --- hw/block/virtio-blk.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 83cf5c01f9..fb0d74da07 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -482,7 +482,7 @@ static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) { uint32_t type; struct iovec *in_iov = req->elem.in_sg; - struct iovec *iov = req->elem.out_sg; + struct iovec *out_iov = req->elem.out_sg; unsigned in_num = req->elem.in_num; unsigned out_num = req->elem.out_num; VirtIOBlock *s = req->dev; @@ -493,13 +493,13 @@ static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) return -1; } - if (unlikely(iov_to_buf(iov, out_num, 0, &req->out, + if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out, sizeof(req->out)) != sizeof(req->out))) { virtio_error(vdev, "virtio-blk request outhdr too short"); return -1; } - iov_discard_front(&iov, &out_num, sizeof(req->out)); + iov_discard_front(&out_iov, &out_num, sizeof(req->out)); if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) { virtio_error(vdev, "virtio-blk request inhdr too short"); @@ -526,7 +526,7 @@ static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) &req->out.sector); if (is_write) { - qemu_iovec_init_external(&req->qiov, iov, out_num); + qemu_iovec_init_external(&req->qiov, out_iov, out_num); trace_virtio_blk_handle_write(vdev, req, req->sector_num, req->qiov.size / BDRV_SECTOR_SIZE); } else { From e61809ed8ac3a2f68eb1cc231244f84eb06adacf Mon Sep 17 00:00:00 2001 From: Dongli Zhang Date: Tue, 6 Nov 2018 12:52:32 +0800 Subject: [PATCH 2/2] virtio-blk: fix comment for virtio_blk_rw_complete as nalloc is initially -1 The initial value of nalloc is -1, but not 1. Signed-off-by: Dongli Zhang Reviewed-by: Laurent Vivier Message-id: 1541479952-32355-1-git-send-email-dongli.zhang@oracle.com Signed-off-by: Stefan Hajnoczi --- hw/block/virtio-blk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index fb0d74da07..f208c6ddb9 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -96,7 +96,7 @@ static void virtio_blk_rw_complete(void *opaque, int ret) trace_virtio_blk_rw_complete(vdev, req, ret); if (req->qiov.nalloc != -1) { - /* If nalloc is != 1 req->qiov is a local copy of the original + /* If nalloc is != -1 req->qiov is a local copy of the original * external iovec. It was allocated in submit_requests to be * able to merge requests. */ qemu_iovec_destroy(&req->qiov);