linux-imx

/*

 * Export the iSCSI boot info to userland via sysfs.

 *

 * Copyright (C) 2010 Red Hat, Inc.  All rights reserved.

 * Copyright (C) 2010 Mike Christie

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License v2.0 as published by

 * the Free Software Foundation

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#include <linux/module.h>

#include <linux/string.h>

#include <linux/slab.h>

#include <linux/sysfs.h>

#include <linux/capability.h>

#include <linux/iscsi_boot_sysfs.h>

​

​

MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>");

MODULE_DESCRIPTION("sysfs interface and helpers to export iSCSI boot information");

MODULE_LICENSE("GPL");

/*

 * The kobject and attribute structures.

 */

struct iscsi_boot_attr {

    struct attribute attr;

    int type;

    ssize_t (*show) (void *data, int type, char *buf);

};

​

/*

 * The routine called for all sysfs attributes.

 */

static ssize_t iscsi_boot_show_attribute(struct kobject *kobj,

                     struct attribute *attr, char *buf)

{

    struct iscsi_boot_kobj *boot_kobj =

            container_of(kobj, struct iscsi_boot_kobj, kobj);

    struct iscsi_boot_attr *boot_attr =

            container_of(attr, struct iscsi_boot_attr, attr);

    ssize_t ret = -EIO;

    char *str = buf;

​

    if (!capable(CAP_SYS_ADMIN))

        return -EACCES;

​

    if (boot_kobj->show)

        ret = boot_kobj->show(boot_kobj->data, boot_attr->type, str);

    return ret;

}

​

static const struct sysfs_ops iscsi_boot_attr_ops = {

    .show = iscsi_boot_show_attribute,

};

​

static void iscsi_boot_kobj_release(struct kobject *kobj)

{

    struct iscsi_boot_kobj *boot_kobj =

            container_of(kobj, struct iscsi_boot_kobj, kobj);

​

    if (boot_kobj->release)

        boot_kobj->release(boot_kobj->data);

    kfree(boot_kobj);

}

​

static struct kobj_type iscsi_boot_ktype = {

    .release = iscsi_boot_kobj_release,

    .sysfs_ops = &iscsi_boot_attr_ops,

};

​

#define iscsi_boot_rd_attr(fnname, sysfs_name, attr_type)       \

static struct iscsi_boot_attr iscsi_boot_attr_##fnname = {  \

    .attr   = { .name = __stringify(sysfs_name), .mode = 0444 },    \

    .type   = attr_type,                        \

}

​

/* Target attrs */

iscsi_boot_rd_attr(tgt_index, index, ISCSI_BOOT_TGT_INDEX);

iscsi_boot_rd_attr(tgt_flags, flags, ISCSI_BOOT_TGT_FLAGS);

iscsi_boot_rd_attr(tgt_ip, ip-addr, ISCSI_BOOT_TGT_IP_ADDR);

iscsi_boot_rd_attr(tgt_port, port, ISCSI_BOOT_TGT_PORT);

iscsi_boot_rd_attr(tgt_lun, lun, ISCSI_BOOT_TGT_LUN);

iscsi_boot_rd_attr(tgt_chap, chap-type, ISCSI_BOOT_TGT_CHAP_TYPE);

iscsi_boot_rd_attr(tgt_nic, nic-assoc, ISCSI_BOOT_TGT_NIC_ASSOC);

iscsi_boot_rd_attr(tgt_name, target-name, ISCSI_BOOT_TGT_NAME);

iscsi_boot_rd_attr(tgt_chap_name, chap-name, ISCSI_BOOT_TGT_CHAP_NAME);