[PATCH v2 nvme-cli 4/4] fabrics: Take the hostnqn parameter from a conf file if not given

[hch@lst.de (Christoph Hellwig)]

On Mon, Aug 08, 2016@02:58:00PM +0300, Sagi Grimberg wrote:
> In order to allow persistent hostnqns, take the hostnqn parameter
> for /etc/nvme/hostnqn if exists.
> 
> Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
> ---
>  fabrics.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/fabrics.c b/fabrics.c
> index 54ed8e17b527..90308f07d0fb 100644
> --- a/fabrics.c
> +++ b/fabrics.c
> @@ -57,6 +57,7 @@ struct config {
>  #define BUF_SIZE		4096
>  #define PATH_NVME_FABRICS	"/dev/nvme-fabrics"
>  #define PATH_NVMF_DISC		"/etc/nvme/nvmf_disc"
> +#define PATH_NVMF_HOSTNQN	"/etc/nvme/hostnqn"
>  #define MAX_DISC_ARGS		10
>  
>  enum {
> @@ -405,6 +406,25 @@ static void save_discovery_log(struct nvmf_disc_rsp_page_hdr *log, int numrec)
>  	close(fd);
>  }
>  
> +static int nvmf_hostnqn_file(void)
> +{
> +	FILE *f;
> +	char hostnqn[255];
> +
> +	f = fopen(PATH_NVMF_HOSTNQN, "r");
> +	if (f == NULL)
> +		return false;
> +
> +	if (fgets(hostnqn, sizeof(hostnqn), f) == NULL)
> +		return false;
> +
> +	cfg.hostnqn = strdup(hostnqn);
> +	if (!cfg.hostnqn)
> +		return false;
> +
> +	return true;

No fclose?  The leak probably isn't bad for a short running program,
but sooner or later someone is going to turn it into a library.

Also shouldn't we just read the 223 bytes of the actual NQN value instead
of the on the wire field length? (which should be 256 anyway IIRC).