On Sun, May 25, 2014 at 6:22 PM, Hani Benhabiles <kroo...@gmail.com> wrote:
> Len field is already set to zero, but not the from field which is sent as
> 0xfffffffffffffe00. This makes no sense, and may cause confuse server
> implementations doing sanity checks (qemu-nbd is an example.)
>
> Signed-off-by: Hani Benhabiles <h...@linux.com>
> ---
>
> Compared to v1:
> * Zero the request structure instead of conditionally zeroing specific fields.
Yeah, this one looks good. Sorry for the confusion on the structs...
> drivers/block/nbd.c | 7 ++-----
> 1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
> index 3a70ea2..8e1df52 100644
> --- a/drivers/block/nbd.c
> +++ b/drivers/block/nbd.c
> @@ -243,14 +243,11 @@ static int nbd_send_req(struct nbd_device *nbd, struct
> request *req)
> struct nbd_request request;
> unsigned long size = blk_rq_bytes(req);
>
> + memset(&request, 0, sizeof(request));
> request.magic = htonl(NBD_REQUEST_MAGIC);
> request.type = htonl(nbd_cmd(req));
>
> - if (nbd_cmd(req) == NBD_CMD_FLUSH) {
> - /* Other values are reserved for FLUSH requests. */
> - request.from = 0;
> - request.len = 0;
> - } else {
> + if (nbd_cmd(req) != NBD_CMD_FLUSH && nbd_cmd(req) != NBD_CMD_DISC) {
> request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9);
> request.len = htonl(size);
> }
> --
> 1.8.3.2
>
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