Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / scsi / iscsi_boot_sysfs.c
blob89700cbca16edf4b5d3d3ce0f2374fa33a390ef9
1 /*
2 * Export the iSCSI boot info to userland via sysfs.
4 * Copyright (C) 2010 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2010 Mike Christie
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License v2.0 as published by
9 * the Free Software Foundation
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/module.h>
18 #include <linux/string.h>
19 #include <linux/slab.h>
20 #include <linux/sysfs.h>
21 #include <linux/capability.h>
22 #include <linux/iscsi_boot_sysfs.h>
25 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>");
26 MODULE_DESCRIPTION("sysfs interface and helpers to export iSCSI boot information");
27 MODULE_LICENSE("GPL");
29 * The kobject and attribute structures.
31 struct iscsi_boot_attr {
32 struct attribute attr;
33 int type;
34 ssize_t (*show) (void *data, int type, char *buf);
38 * The routine called for all sysfs attributes.
40 static ssize_t iscsi_boot_show_attribute(struct kobject *kobj,
41 struct attribute *attr, char *buf)
43 struct iscsi_boot_kobj *boot_kobj =
44 container_of(kobj, struct iscsi_boot_kobj, kobj);
45 struct iscsi_boot_attr *boot_attr =
46 container_of(attr, struct iscsi_boot_attr, attr);
47 ssize_t ret = -EIO;
48 char *str = buf;
50 if (!capable(CAP_SYS_ADMIN))
51 return -EACCES;
53 if (boot_kobj->show)
54 ret = boot_kobj->show(boot_kobj->data, boot_attr->type, str);
55 return ret;
58 static const struct sysfs_ops iscsi_boot_attr_ops = {
59 .show = iscsi_boot_show_attribute,
62 static void iscsi_boot_kobj_release(struct kobject *kobj)
64 struct iscsi_boot_kobj *boot_kobj =
65 container_of(kobj, struct iscsi_boot_kobj, kobj);
67 if (boot_kobj->release)
68 boot_kobj->release(boot_kobj->data);
69 kfree(boot_kobj);
72 static struct kobj_type iscsi_boot_ktype = {
73 .release = iscsi_boot_kobj_release,
74 .sysfs_ops = &iscsi_boot_attr_ops,
77 #define iscsi_boot_rd_attr(fnname, sysfs_name, attr_type) \
78 static struct iscsi_boot_attr iscsi_boot_attr_##fnname = { \
79 .attr = { .name = __stringify(sysfs_name), .mode = 0444 }, \
80 .type = attr_type, \
83 /* Target attrs */
84 iscsi_boot_rd_attr(tgt_index, index, ISCSI_BOOT_TGT_INDEX);
85 iscsi_boot_rd_attr(tgt_flags, flags, ISCSI_BOOT_TGT_FLAGS);
86 iscsi_boot_rd_attr(tgt_ip, ip-addr, ISCSI_BOOT_TGT_IP_ADDR);
87 iscsi_boot_rd_attr(tgt_port, port, ISCSI_BOOT_TGT_PORT);
88 iscsi_boot_rd_attr(tgt_lun, lun, ISCSI_BOOT_TGT_LUN);
89 iscsi_boot_rd_attr(tgt_chap, chap-type, ISCSI_BOOT_TGT_CHAP_TYPE);
90 iscsi_boot_rd_attr(tgt_nic, nic-assoc, ISCSI_BOOT_TGT_NIC_ASSOC);
91 iscsi_boot_rd_attr(tgt_name, target-name, ISCSI_BOOT_TGT_NAME);
92 iscsi_boot_rd_attr(tgt_chap_name, chap-name, ISCSI_BOOT_TGT_CHAP_NAME);
93 iscsi_boot_rd_attr(tgt_chap_secret, chap-secret, ISCSI_BOOT_TGT_CHAP_SECRET);
94 iscsi_boot_rd_attr(tgt_chap_rev_name, rev-chap-name,
95 ISCSI_BOOT_TGT_REV_CHAP_NAME);
96 iscsi_boot_rd_attr(tgt_chap_rev_secret, rev-chap-name-secret,
97 ISCSI_BOOT_TGT_REV_CHAP_SECRET);
99 static struct attribute *target_attrs[] = {
100 &iscsi_boot_attr_tgt_index.attr,
101 &iscsi_boot_attr_tgt_flags.attr,
102 &iscsi_boot_attr_tgt_ip.attr,
103 &iscsi_boot_attr_tgt_port.attr,
104 &iscsi_boot_attr_tgt_lun.attr,
105 &iscsi_boot_attr_tgt_chap.attr,
106 &iscsi_boot_attr_tgt_nic.attr,
107 &iscsi_boot_attr_tgt_name.attr,
108 &iscsi_boot_attr_tgt_chap_name.attr,
109 &iscsi_boot_attr_tgt_chap_secret.attr,
110 &iscsi_boot_attr_tgt_chap_rev_name.attr,
111 &iscsi_boot_attr_tgt_chap_rev_secret.attr,
112 NULL
115 static mode_t iscsi_boot_tgt_attr_is_visible(struct kobject *kobj,
116 struct attribute *attr, int i)
118 struct iscsi_boot_kobj *boot_kobj =
119 container_of(kobj, struct iscsi_boot_kobj, kobj);
121 if (attr == &iscsi_boot_attr_tgt_index.attr)
122 return boot_kobj->is_visible(boot_kobj->data,
123 ISCSI_BOOT_TGT_INDEX);
124 else if (attr == &iscsi_boot_attr_tgt_flags.attr)
125 return boot_kobj->is_visible(boot_kobj->data,
126 ISCSI_BOOT_TGT_FLAGS);
127 else if (attr == &iscsi_boot_attr_tgt_ip.attr)
128 return boot_kobj->is_visible(boot_kobj->data,
129 ISCSI_BOOT_TGT_IP_ADDR);
130 else if (attr == &iscsi_boot_attr_tgt_port.attr)
131 return boot_kobj->is_visible(boot_kobj->data,
132 ISCSI_BOOT_TGT_PORT);
133 else if (attr == &iscsi_boot_attr_tgt_lun.attr)
134 return boot_kobj->is_visible(boot_kobj->data,
135 ISCSI_BOOT_TGT_LUN);
136 else if (attr == &iscsi_boot_attr_tgt_chap.attr)
137 return boot_kobj->is_visible(boot_kobj->data,
138 ISCSI_BOOT_TGT_CHAP_TYPE);
139 else if (attr == &iscsi_boot_attr_tgt_nic.attr)
140 return boot_kobj->is_visible(boot_kobj->data,
141 ISCSI_BOOT_TGT_NIC_ASSOC);
142 else if (attr == &iscsi_boot_attr_tgt_name.attr)
143 return boot_kobj->is_visible(boot_kobj->data,
144 ISCSI_BOOT_TGT_NAME);
145 else if (attr == &iscsi_boot_attr_tgt_chap_name.attr)
146 return boot_kobj->is_visible(boot_kobj->data,
147 ISCSI_BOOT_TGT_CHAP_NAME);
148 else if (attr == &iscsi_boot_attr_tgt_chap_secret.attr)
149 return boot_kobj->is_visible(boot_kobj->data,
150 ISCSI_BOOT_TGT_CHAP_SECRET);
151 else if (attr == &iscsi_boot_attr_tgt_chap_rev_name.attr)
152 return boot_kobj->is_visible(boot_kobj->data,
153 ISCSI_BOOT_TGT_REV_CHAP_NAME);
154 else if (attr == &iscsi_boot_attr_tgt_chap_rev_secret.attr)
155 return boot_kobj->is_visible(boot_kobj->data,
156 ISCSI_BOOT_TGT_REV_CHAP_SECRET);
157 return 0;
160 static struct attribute_group iscsi_boot_target_attr_group = {
161 .attrs = target_attrs,
162 .is_visible = iscsi_boot_tgt_attr_is_visible,
165 /* Ethernet attrs */
166 iscsi_boot_rd_attr(eth_index, index, ISCSI_BOOT_ETH_INDEX);
167 iscsi_boot_rd_attr(eth_flags, flags, ISCSI_BOOT_ETH_FLAGS);
168 iscsi_boot_rd_attr(eth_ip, ip-addr, ISCSI_BOOT_ETH_IP_ADDR);
169 iscsi_boot_rd_attr(eth_subnet, subnet-mask, ISCSI_BOOT_ETH_SUBNET_MASK);
170 iscsi_boot_rd_attr(eth_origin, origin, ISCSI_BOOT_ETH_ORIGIN);
171 iscsi_boot_rd_attr(eth_gateway, gateway, ISCSI_BOOT_ETH_GATEWAY);
172 iscsi_boot_rd_attr(eth_primary_dns, primary-dns, ISCSI_BOOT_ETH_PRIMARY_DNS);
173 iscsi_boot_rd_attr(eth_secondary_dns, secondary-dns,
174 ISCSI_BOOT_ETH_SECONDARY_DNS);
175 iscsi_boot_rd_attr(eth_dhcp, dhcp, ISCSI_BOOT_ETH_DHCP);
176 iscsi_boot_rd_attr(eth_vlan, vlan, ISCSI_BOOT_ETH_VLAN);
177 iscsi_boot_rd_attr(eth_mac, mac, ISCSI_BOOT_ETH_MAC);
178 iscsi_boot_rd_attr(eth_hostname, hostname, ISCSI_BOOT_ETH_HOSTNAME);
180 static struct attribute *ethernet_attrs[] = {
181 &iscsi_boot_attr_eth_index.attr,
182 &iscsi_boot_attr_eth_flags.attr,
183 &iscsi_boot_attr_eth_ip.attr,
184 &iscsi_boot_attr_eth_subnet.attr,
185 &iscsi_boot_attr_eth_origin.attr,
186 &iscsi_boot_attr_eth_gateway.attr,
187 &iscsi_boot_attr_eth_primary_dns.attr,
188 &iscsi_boot_attr_eth_secondary_dns.attr,
189 &iscsi_boot_attr_eth_dhcp.attr,
190 &iscsi_boot_attr_eth_vlan.attr,
191 &iscsi_boot_attr_eth_mac.attr,
192 &iscsi_boot_attr_eth_hostname.attr,
193 NULL
196 static mode_t iscsi_boot_eth_attr_is_visible(struct kobject *kobj,
197 struct attribute *attr, int i)
199 struct iscsi_boot_kobj *boot_kobj =
200 container_of(kobj, struct iscsi_boot_kobj, kobj);
202 if (attr == &iscsi_boot_attr_eth_index.attr)
203 return boot_kobj->is_visible(boot_kobj->data,
204 ISCSI_BOOT_ETH_INDEX);
205 else if (attr == &iscsi_boot_attr_eth_flags.attr)
206 return boot_kobj->is_visible(boot_kobj->data,
207 ISCSI_BOOT_ETH_FLAGS);
208 else if (attr == &iscsi_boot_attr_eth_ip.attr)
209 return boot_kobj->is_visible(boot_kobj->data,
210 ISCSI_BOOT_ETH_IP_ADDR);
211 else if (attr == &iscsi_boot_attr_eth_subnet.attr)
212 return boot_kobj->is_visible(boot_kobj->data,
213 ISCSI_BOOT_ETH_SUBNET_MASK);
214 else if (attr == &iscsi_boot_attr_eth_origin.attr)
215 return boot_kobj->is_visible(boot_kobj->data,
216 ISCSI_BOOT_ETH_ORIGIN);
217 else if (attr == &iscsi_boot_attr_eth_gateway.attr)
218 return boot_kobj->is_visible(boot_kobj->data,
219 ISCSI_BOOT_ETH_GATEWAY);
220 else if (attr == &iscsi_boot_attr_eth_primary_dns.attr)
221 return boot_kobj->is_visible(boot_kobj->data,
222 ISCSI_BOOT_ETH_PRIMARY_DNS);
223 else if (attr == &iscsi_boot_attr_eth_secondary_dns.attr)
224 return boot_kobj->is_visible(boot_kobj->data,
225 ISCSI_BOOT_ETH_SECONDARY_DNS);
226 else if (attr == &iscsi_boot_attr_eth_dhcp.attr)
227 return boot_kobj->is_visible(boot_kobj->data,
228 ISCSI_BOOT_ETH_DHCP);
229 else if (attr == &iscsi_boot_attr_eth_vlan.attr)
230 return boot_kobj->is_visible(boot_kobj->data,
231 ISCSI_BOOT_ETH_VLAN);
232 else if (attr == &iscsi_boot_attr_eth_mac.attr)
233 return boot_kobj->is_visible(boot_kobj->data,
234 ISCSI_BOOT_ETH_MAC);
235 else if (attr == &iscsi_boot_attr_eth_hostname.attr)
236 return boot_kobj->is_visible(boot_kobj->data,
237 ISCSI_BOOT_ETH_HOSTNAME);
238 return 0;
241 static struct attribute_group iscsi_boot_ethernet_attr_group = {
242 .attrs = ethernet_attrs,
243 .is_visible = iscsi_boot_eth_attr_is_visible,
246 /* Initiator attrs */
247 iscsi_boot_rd_attr(ini_index, index, ISCSI_BOOT_INI_INDEX);
248 iscsi_boot_rd_attr(ini_flags, flags, ISCSI_BOOT_INI_FLAGS);
249 iscsi_boot_rd_attr(ini_isns, isns-server, ISCSI_BOOT_INI_ISNS_SERVER);
250 iscsi_boot_rd_attr(ini_slp, slp-server, ISCSI_BOOT_INI_SLP_SERVER);
251 iscsi_boot_rd_attr(ini_primary_radius, pri-radius-server,
252 ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
253 iscsi_boot_rd_attr(ini_secondary_radius, sec-radius-server,
254 ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
255 iscsi_boot_rd_attr(ini_name, initiator-name, ISCSI_BOOT_INI_INITIATOR_NAME);
257 static struct attribute *initiator_attrs[] = {
258 &iscsi_boot_attr_ini_index.attr,
259 &iscsi_boot_attr_ini_flags.attr,
260 &iscsi_boot_attr_ini_isns.attr,
261 &iscsi_boot_attr_ini_slp.attr,
262 &iscsi_boot_attr_ini_primary_radius.attr,
263 &iscsi_boot_attr_ini_secondary_radius.attr,
264 &iscsi_boot_attr_ini_name.attr,
265 NULL
268 static mode_t iscsi_boot_ini_attr_is_visible(struct kobject *kobj,
269 struct attribute *attr, int i)
271 struct iscsi_boot_kobj *boot_kobj =
272 container_of(kobj, struct iscsi_boot_kobj, kobj);
274 if (attr == &iscsi_boot_attr_ini_index.attr)
275 return boot_kobj->is_visible(boot_kobj->data,
276 ISCSI_BOOT_INI_INDEX);
277 if (attr == &iscsi_boot_attr_ini_flags.attr)
278 return boot_kobj->is_visible(boot_kobj->data,
279 ISCSI_BOOT_INI_FLAGS);
280 if (attr == &iscsi_boot_attr_ini_isns.attr)
281 return boot_kobj->is_visible(boot_kobj->data,
282 ISCSI_BOOT_INI_ISNS_SERVER);
283 if (attr == &iscsi_boot_attr_ini_slp.attr)
284 return boot_kobj->is_visible(boot_kobj->data,
285 ISCSI_BOOT_INI_SLP_SERVER);
286 if (attr == &iscsi_boot_attr_ini_primary_radius.attr)
287 return boot_kobj->is_visible(boot_kobj->data,
288 ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
289 if (attr == &iscsi_boot_attr_ini_secondary_radius.attr)
290 return boot_kobj->is_visible(boot_kobj->data,
291 ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
292 if (attr == &iscsi_boot_attr_ini_name.attr)
293 return boot_kobj->is_visible(boot_kobj->data,
294 ISCSI_BOOT_INI_INITIATOR_NAME);
296 return 0;
299 static struct attribute_group iscsi_boot_initiator_attr_group = {
300 .attrs = initiator_attrs,
301 .is_visible = iscsi_boot_ini_attr_is_visible,
304 static struct iscsi_boot_kobj *
305 iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
306 struct attribute_group *attr_group,
307 const char *name, int index, void *data,
308 ssize_t (*show) (void *data, int type, char *buf),
309 mode_t (*is_visible) (void *data, int type),
310 void (*release) (void *data))
312 struct iscsi_boot_kobj *boot_kobj;
314 boot_kobj = kzalloc(sizeof(*boot_kobj), GFP_KERNEL);
315 if (!boot_kobj)
316 return NULL;
317 INIT_LIST_HEAD(&boot_kobj->list);
319 boot_kobj->kobj.kset = boot_kset->kset;
320 if (kobject_init_and_add(&boot_kobj->kobj, &iscsi_boot_ktype,
321 NULL, name, index)) {
322 kfree(boot_kobj);
323 return NULL;
325 boot_kobj->data = data;
326 boot_kobj->show = show;
327 boot_kobj->is_visible = is_visible;
328 boot_kobj->release = release;
330 if (sysfs_create_group(&boot_kobj->kobj, attr_group)) {
332 * We do not want to free this because the caller
333 * will assume that since the creation call failed
334 * the boot kobj was not setup and the normal release
335 * path is not being run.
337 boot_kobj->release = NULL;
338 kobject_put(&boot_kobj->kobj);
339 return NULL;
341 boot_kobj->attr_group = attr_group;
343 kobject_uevent(&boot_kobj->kobj, KOBJ_ADD);
344 /* Nothing broke so lets add it to the list. */
345 list_add_tail(&boot_kobj->list, &boot_kset->kobj_list);
346 return boot_kobj;
349 static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
351 list_del(&boot_kobj->list);
352 sysfs_remove_group(&boot_kobj->kobj, boot_kobj->attr_group);
353 kobject_put(&boot_kobj->kobj);
357 * iscsi_boot_create_target() - create boot target sysfs dir
358 * @boot_kset: boot kset
359 * @index: the target id
360 * @data: driver specific data for target
361 * @show: attr show function
362 * @is_visible: attr visibility function
363 * @release: release function
365 * Note: The boot sysfs lib will free the data passed in for the caller
366 * when all refs to the target kobject have been released.
368 struct iscsi_boot_kobj *
369 iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
370 void *data,
371 ssize_t (*show) (void *data, int type, char *buf),
372 mode_t (*is_visible) (void *data, int type),
373 void (*release) (void *data))
375 return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
376 "target%d", index, data, show, is_visible,
377 release);
379 EXPORT_SYMBOL_GPL(iscsi_boot_create_target);
382 * iscsi_boot_create_initiator() - create boot initiator sysfs dir
383 * @boot_kset: boot kset
384 * @index: the initiator id
385 * @data: driver specific data
386 * @show: attr show function
387 * @is_visible: attr visibility function
388 * @release: release function
390 * Note: The boot sysfs lib will free the data passed in for the caller
391 * when all refs to the initiator kobject have been released.
393 struct iscsi_boot_kobj *
394 iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
395 void *data,
396 ssize_t (*show) (void *data, int type, char *buf),
397 mode_t (*is_visible) (void *data, int type),
398 void (*release) (void *data))
400 return iscsi_boot_create_kobj(boot_kset,
401 &iscsi_boot_initiator_attr_group,
402 "initiator", index, data, show,
403 is_visible, release);
405 EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);
408 * iscsi_boot_create_ethernet() - create boot ethernet sysfs dir
409 * @boot_kset: boot kset
410 * @index: the ethernet device id
411 * @data: driver specific data
412 * @show: attr show function
413 * @is_visible: attr visibility function
414 * @release: release function
416 * Note: The boot sysfs lib will free the data passed in for the caller
417 * when all refs to the ethernet kobject have been released.
419 struct iscsi_boot_kobj *
420 iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
421 void *data,
422 ssize_t (*show) (void *data, int type, char *buf),
423 mode_t (*is_visible) (void *data, int type),
424 void (*release) (void *data))
426 return iscsi_boot_create_kobj(boot_kset,
427 &iscsi_boot_ethernet_attr_group,
428 "ethernet%d", index, data, show,
429 is_visible, release);
431 EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);
434 * iscsi_boot_create_kset() - creates root sysfs tree
435 * @set_name: name of root dir
437 struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name)
439 struct iscsi_boot_kset *boot_kset;
441 boot_kset = kzalloc(sizeof(*boot_kset), GFP_KERNEL);
442 if (!boot_kset)
443 return NULL;
445 boot_kset->kset = kset_create_and_add(set_name, NULL, firmware_kobj);
446 if (!boot_kset->kset) {
447 kfree(boot_kset);
448 return NULL;
451 INIT_LIST_HEAD(&boot_kset->kobj_list);
452 return boot_kset;
454 EXPORT_SYMBOL_GPL(iscsi_boot_create_kset);
457 * iscsi_boot_create_host_kset() - creates root sysfs tree for a scsi host
458 * @hostno: host number of scsi host
460 struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno)
462 struct iscsi_boot_kset *boot_kset;
463 char *set_name;
465 set_name = kasprintf(GFP_KERNEL, "iscsi_boot%u", hostno);
466 if (!set_name)
467 return NULL;
469 boot_kset = iscsi_boot_create_kset(set_name);
470 kfree(set_name);
471 return boot_kset;
473 EXPORT_SYMBOL_GPL(iscsi_boot_create_host_kset);
476 * iscsi_boot_destroy_kset() - destroy kset and kobjects under it
477 * @boot_kset: boot kset
479 * This will remove the kset and kobjects and attrs under it.
481 void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
483 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
485 if (!boot_kset)
486 return;
488 list_for_each_entry_safe(boot_kobj, tmp_kobj,
489 &boot_kset->kobj_list, list)
490 iscsi_boot_remove_kobj(boot_kobj);
492 kset_unregister(boot_kset->kset);
494 EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);