linux-kernel - RE: [PATCH] Tools: hv: use full nlmsghdr in netlink

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Date:	Wed, 7 Aug 2013 13:49:38 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Olaf Hering <olaf@...fle.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] Tools: hv: use full nlmsghdr in netlink_send



> -----Original Message-----
> From: Olaf Hering [mailto:olaf@...fle.de]
> Sent: Wednesday, August 07, 2013 9:45 AM
> To: KY Srinivasan; gregkh@...uxfoundation.org
> Cc: linux-kernel@...r.kernel.org; Olaf Hering
> Subject: [PATCH] Tools: hv: use full nlmsghdr in netlink_send
> 
> There is no need to have a nlmsghdr pointer to another temporary buffer.
> Instead use a full struct nlmsghdr.
> 
> Signed-off-by: Olaf Hering <olaf@...fle.de>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> ---
>  tools/hv/hv_kvp_daemon.c | 15 +++++----------
>  tools/hv/hv_vss_daemon.c | 15 +++++----------
>  2 files changed, 10 insertions(+), 20 deletions(-)
> 
> diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
> index 1bd1ad1..7c05f55 100644
> --- a/tools/hv/hv_kvp_daemon.c
> +++ b/tools/hv/hv_kvp_daemon.c
> @@ -1393,23 +1393,18 @@ kvp_get_domain_name(char *buffer, int length)
>  static int
>  netlink_send(int fd, struct cn_msg *msg)
>  {
> -	struct nlmsghdr *nlh;
> +	struct nlmsghdr nlh = { .nlmsg_type = NLMSG_DONE };
>  	unsigned int size;
>  	struct msghdr message;
> -	char buffer[64];
>  	struct iovec iov[2];
> 
>  	size = sizeof(struct cn_msg) + msg->len;
> 
> -	nlh = (struct nlmsghdr *)buffer;
> -	nlh->nlmsg_seq = 0;
> -	nlh->nlmsg_pid = getpid();
> -	nlh->nlmsg_type = NLMSG_DONE;
> -	nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
> -	nlh->nlmsg_flags = 0;
> +	nlh.nlmsg_pid = getpid();
> +	nlh.nlmsg_len = NLMSG_LENGTH(size);
> 
> -	iov[0].iov_base = nlh;
> -	iov[0].iov_len = sizeof(*nlh);
> +	iov[0].iov_base = &nlh;
> +	iov[0].iov_len = sizeof(nlh);
> 
>  	iov[1].iov_base = msg;
>  	iov[1].iov_len = size;
> diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c
> index 2f1f53f..8ac0ee7 100644
> --- a/tools/hv/hv_vss_daemon.c
> +++ b/tools/hv/hv_vss_daemon.c
> @@ -105,23 +105,18 @@ static int vss_operate(int operation)
> 
>  static int netlink_send(int fd, struct cn_msg *msg)
>  {
> -	struct nlmsghdr *nlh;
> +	struct nlmsghdr nlh = { .nlmsg_type = NLMSG_DONE };
>  	unsigned int size;
>  	struct msghdr message;
> -	char buffer[64];
>  	struct iovec iov[2];
> 
>  	size = sizeof(struct cn_msg) + msg->len;
> 
> -	nlh = (struct nlmsghdr *)buffer;
> -	nlh->nlmsg_seq = 0;
> -	nlh->nlmsg_pid = getpid();
> -	nlh->nlmsg_type = NLMSG_DONE;
> -	nlh->nlmsg_len = NLMSG_LENGTH(size - sizeof(*nlh));
> -	nlh->nlmsg_flags = 0;
> +	nlh.nlmsg_pid = getpid();
> +	nlh.nlmsg_len = NLMSG_LENGTH(size);
> 
> -	iov[0].iov_base = nlh;
> -	iov[0].iov_len = sizeof(*nlh);
> +	iov[0].iov_base = &nlh;
> +	iov[0].iov_len = sizeof(nlh);
> 
>  	iov[1].iov_base = msg;
>  	iov[1].iov_len = size;



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