[dm-devel] [PATCH] multipath: make tgt_node_name work for iscsi devices

[Christophe Varoqui]

On jeu., 2012-01-12 at 22:14 -0600, Benjamin Marzinski wrote:
> tgt_node_name wasn't displaying anything for iscsi devices. With this
> change, if multipath can't get the node_name, it will check
> sys/devices/platform/hostX/sessionY/iscsi_session/sessionY/targetname
> and if this is available, it will get the node name from there.
> 

Applied.

> Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
> ---
>  libmultipath/discovery.c |   20 ++++++++++++++++++--
>  libmultipath/structs.h   |    2 +-
>  2 files changed, 19 insertions(+), 3 deletions(-)
> 
> Index: multipath-tools-111219/libmultipath/discovery.c
> ===================================================================
> --- multipath-tools-111219.orig/libmultipath/discovery.c
> +++ multipath-tools-111219/libmultipath/discovery.c
> @@ -210,10 +210,11 @@ sysfs_get_size (struct sysfs_device * de
>  }
>  
>  int
> -sysfs_get_fc_nodename (struct sysfs_device * dev, char * node,
> +sysfs_get_tgt_nodename (struct sysfs_device * dev, char * node,
>  		       unsigned int host, unsigned int channel,
>  		       unsigned int target)
>  {
> +	unsigned int checkhost, session;
>  	char attr_path[SYSFS_PATH_SIZE];
>  	size_t len;
>  
> @@ -225,6 +226,21 @@ sysfs_get_fc_nodename (struct sysfs_devi
>  	}
>  
>  	len = sysfs_attr_get_value(attr_path, "node_name", node, NODE_NAME_SIZE);
> +	if (len)
> +		return 0;
> +
> +	if (sscanf(dev->devpath, "/devices/platform/host%u/session%u/",
> +	           &checkhost, &session) != 2)
> +		return 1;
> +	if (checkhost != host)
> +		return 1;
> +	if (safe_sprintf(attr_path, "/devices/platform/host%u/session%u/iscsi_session/session%u", host, session, session)) {
> +		condlog(0, "attr_path too small");
> +		return 1;
> +	}
> +
> +	len = sysfs_attr_get_value(attr_path, "targetname", node,
> +				   NODE_NAME_SIZE);
>  	if (!len)
>  		return 1;
>  
> @@ -562,7 +578,7 @@ scsi_sysfs_pathinfo (struct path * pp, s
>  	/*
>  	 * target node name
>  	 */
> -	if(!sysfs_get_fc_nodename(parent, pp->tgt_node_name,
> +	if(!sysfs_get_tgt_nodename(parent, pp->tgt_node_name,
>  				 pp->sg_id.host_no,
>  				 pp->sg_id.channel,
>  				 pp->sg_id.scsi_id)) {
> Index: multipath-tools-111219/libmultipath/structs.h
> ===================================================================
> --- multipath-tools-111219.orig/libmultipath/structs.h
> +++ multipath-tools-111219/libmultipath/structs.h
> @@ -5,7 +5,7 @@
>  
>  #define WWID_SIZE		128
>  #define SERIAL_SIZE		65
> -#define NODE_NAME_SIZE		65
> +#define NODE_NAME_SIZE		224
>  #define PATH_STR_SIZE		16
>  #define PARAMS_SIZE		1024
>  #define FILE_NAME_SIZE		256