1 /*
2 * Export the iSCSI boot info to userland via sysfs.
3 *
4 * Copyright (C) 2010 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2010 Mike Christie
6 *
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
10 *
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.
15 */
16
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>
23
24
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");
28 /*
29 * The kobject and attribute structures.
30 */
31 struct iscsi_boot_attr {
32 struct attribute attr;
33 int type;
34 ssize_t (*show) (void *data, int type, char *buf);
35 };
36
37 /*
38 * The routine called for all sysfs attributes.
39 */
iscsi_boot_show_attribute(struct kobject * kobj,struct attribute * attr,char * buf)40 static ssize_t iscsi_boot_show_attribute(struct kobject *kobj,
41 struct attribute *attr, char *buf)
42 {
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;
49
50 if (!capable(CAP_SYS_ADMIN))
51 return -EACCES;
52
53 if (boot_kobj->show)
54 ret = boot_kobj->show(boot_kobj->data, boot_attr->type, str);
55 return ret;
56 }
57
58 static const struct sysfs_ops iscsi_boot_attr_ops = {
59 .show = iscsi_boot_show_attribute,
60 };
61
iscsi_boot_kobj_release(struct kobject * kobj)62 static void iscsi_boot_kobj_release(struct kobject *kobj)
63 {
64 struct iscsi_boot_kobj *boot_kobj =
65 container_of(kobj, struct iscsi_boot_kobj, kobj);
66
67 if (boot_kobj->release)
68 boot_kobj->release(boot_kobj->data);
69 kfree(boot_kobj);
70 }
71
72 static struct kobj_type iscsi_boot_ktype = {
73 .release = iscsi_boot_kobj_release,
74 .sysfs_ops = &iscsi_boot_attr_ops,
75 };
76
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, \
81 }
82
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);
98
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
113 };
114
iscsi_boot_tgt_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)115 static umode_t iscsi_boot_tgt_attr_is_visible(struct kobject *kobj,
116 struct attribute *attr, int i)
117 {
118 struct iscsi_boot_kobj *boot_kobj =
119 container_of(kobj, struct iscsi_boot_kobj, kobj);
120
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;
158 }
159
160 static struct attribute_group iscsi_boot_target_attr_group = {
161 .attrs = target_attrs,
162 .is_visible = iscsi_boot_tgt_attr_is_visible,
163 };
164
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_prefix, prefix-len, ISCSI_BOOT_ETH_PREFIX_LEN);
170 iscsi_boot_rd_attr(eth_subnet, subnet-mask, ISCSI_BOOT_ETH_SUBNET_MASK);
171 iscsi_boot_rd_attr(eth_origin, origin, ISCSI_BOOT_ETH_ORIGIN);
172 iscsi_boot_rd_attr(eth_gateway, gateway, ISCSI_BOOT_ETH_GATEWAY);
173 iscsi_boot_rd_attr(eth_primary_dns, primary-dns, ISCSI_BOOT_ETH_PRIMARY_DNS);
174 iscsi_boot_rd_attr(eth_secondary_dns, secondary-dns,
175 ISCSI_BOOT_ETH_SECONDARY_DNS);
176 iscsi_boot_rd_attr(eth_dhcp, dhcp, ISCSI_BOOT_ETH_DHCP);
177 iscsi_boot_rd_attr(eth_vlan, vlan, ISCSI_BOOT_ETH_VLAN);
178 iscsi_boot_rd_attr(eth_mac, mac, ISCSI_BOOT_ETH_MAC);
179 iscsi_boot_rd_attr(eth_hostname, hostname, ISCSI_BOOT_ETH_HOSTNAME);
180
181 static struct attribute *ethernet_attrs[] = {
182 &iscsi_boot_attr_eth_index.attr,
183 &iscsi_boot_attr_eth_flags.attr,
184 &iscsi_boot_attr_eth_ip.attr,
185 &iscsi_boot_attr_eth_prefix.attr,
186 &iscsi_boot_attr_eth_subnet.attr,
187 &iscsi_boot_attr_eth_origin.attr,
188 &iscsi_boot_attr_eth_gateway.attr,
189 &iscsi_boot_attr_eth_primary_dns.attr,
190 &iscsi_boot_attr_eth_secondary_dns.attr,
191 &iscsi_boot_attr_eth_dhcp.attr,
192 &iscsi_boot_attr_eth_vlan.attr,
193 &iscsi_boot_attr_eth_mac.attr,
194 &iscsi_boot_attr_eth_hostname.attr,
195 NULL
196 };
197
iscsi_boot_eth_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)198 static umode_t iscsi_boot_eth_attr_is_visible(struct kobject *kobj,
199 struct attribute *attr, int i)
200 {
201 struct iscsi_boot_kobj *boot_kobj =
202 container_of(kobj, struct iscsi_boot_kobj, kobj);
203
204 if (attr == &iscsi_boot_attr_eth_index.attr)
205 return boot_kobj->is_visible(boot_kobj->data,
206 ISCSI_BOOT_ETH_INDEX);
207 else if (attr == &iscsi_boot_attr_eth_flags.attr)
208 return boot_kobj->is_visible(boot_kobj->data,
209 ISCSI_BOOT_ETH_FLAGS);
210 else if (attr == &iscsi_boot_attr_eth_ip.attr)
211 return boot_kobj->is_visible(boot_kobj->data,
212 ISCSI_BOOT_ETH_IP_ADDR);
213 else if (attr == &iscsi_boot_attr_eth_prefix.attr)
214 return boot_kobj->is_visible(boot_kobj->data,
215 ISCSI_BOOT_ETH_PREFIX_LEN);
216 else if (attr == &iscsi_boot_attr_eth_subnet.attr)
217 return boot_kobj->is_visible(boot_kobj->data,
218 ISCSI_BOOT_ETH_SUBNET_MASK);
219 else if (attr == &iscsi_boot_attr_eth_origin.attr)
220 return boot_kobj->is_visible(boot_kobj->data,
221 ISCSI_BOOT_ETH_ORIGIN);
222 else if (attr == &iscsi_boot_attr_eth_gateway.attr)
223 return boot_kobj->is_visible(boot_kobj->data,
224 ISCSI_BOOT_ETH_GATEWAY);
225 else if (attr == &iscsi_boot_attr_eth_primary_dns.attr)
226 return boot_kobj->is_visible(boot_kobj->data,
227 ISCSI_BOOT_ETH_PRIMARY_DNS);
228 else if (attr == &iscsi_boot_attr_eth_secondary_dns.attr)
229 return boot_kobj->is_visible(boot_kobj->data,
230 ISCSI_BOOT_ETH_SECONDARY_DNS);
231 else if (attr == &iscsi_boot_attr_eth_dhcp.attr)
232 return boot_kobj->is_visible(boot_kobj->data,
233 ISCSI_BOOT_ETH_DHCP);
234 else if (attr == &iscsi_boot_attr_eth_vlan.attr)
235 return boot_kobj->is_visible(boot_kobj->data,
236 ISCSI_BOOT_ETH_VLAN);
237 else if (attr == &iscsi_boot_attr_eth_mac.attr)
238 return boot_kobj->is_visible(boot_kobj->data,
239 ISCSI_BOOT_ETH_MAC);
240 else if (attr == &iscsi_boot_attr_eth_hostname.attr)
241 return boot_kobj->is_visible(boot_kobj->data,
242 ISCSI_BOOT_ETH_HOSTNAME);
243 return 0;
244 }
245
246 static struct attribute_group iscsi_boot_ethernet_attr_group = {
247 .attrs = ethernet_attrs,
248 .is_visible = iscsi_boot_eth_attr_is_visible,
249 };
250
251 /* Initiator attrs */
252 iscsi_boot_rd_attr(ini_index, index, ISCSI_BOOT_INI_INDEX);
253 iscsi_boot_rd_attr(ini_flags, flags, ISCSI_BOOT_INI_FLAGS);
254 iscsi_boot_rd_attr(ini_isns, isns-server, ISCSI_BOOT_INI_ISNS_SERVER);
255 iscsi_boot_rd_attr(ini_slp, slp-server, ISCSI_BOOT_INI_SLP_SERVER);
256 iscsi_boot_rd_attr(ini_primary_radius, pri-radius-server,
257 ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
258 iscsi_boot_rd_attr(ini_secondary_radius, sec-radius-server,
259 ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
260 iscsi_boot_rd_attr(ini_name, initiator-name, ISCSI_BOOT_INI_INITIATOR_NAME);
261
262 static struct attribute *initiator_attrs[] = {
263 &iscsi_boot_attr_ini_index.attr,
264 &iscsi_boot_attr_ini_flags.attr,
265 &iscsi_boot_attr_ini_isns.attr,
266 &iscsi_boot_attr_ini_slp.attr,
267 &iscsi_boot_attr_ini_primary_radius.attr,
268 &iscsi_boot_attr_ini_secondary_radius.attr,
269 &iscsi_boot_attr_ini_name.attr,
270 NULL
271 };
272
iscsi_boot_ini_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)273 static umode_t iscsi_boot_ini_attr_is_visible(struct kobject *kobj,
274 struct attribute *attr, int i)
275 {
276 struct iscsi_boot_kobj *boot_kobj =
277 container_of(kobj, struct iscsi_boot_kobj, kobj);
278
279 if (attr == &iscsi_boot_attr_ini_index.attr)
280 return boot_kobj->is_visible(boot_kobj->data,
281 ISCSI_BOOT_INI_INDEX);
282 if (attr == &iscsi_boot_attr_ini_flags.attr)
283 return boot_kobj->is_visible(boot_kobj->data,
284 ISCSI_BOOT_INI_FLAGS);
285 if (attr == &iscsi_boot_attr_ini_isns.attr)
286 return boot_kobj->is_visible(boot_kobj->data,
287 ISCSI_BOOT_INI_ISNS_SERVER);
288 if (attr == &iscsi_boot_attr_ini_slp.attr)
289 return boot_kobj->is_visible(boot_kobj->data,
290 ISCSI_BOOT_INI_SLP_SERVER);
291 if (attr == &iscsi_boot_attr_ini_primary_radius.attr)
292 return boot_kobj->is_visible(boot_kobj->data,
293 ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
294 if (attr == &iscsi_boot_attr_ini_secondary_radius.attr)
295 return boot_kobj->is_visible(boot_kobj->data,
296 ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
297 if (attr == &iscsi_boot_attr_ini_name.attr)
298 return boot_kobj->is_visible(boot_kobj->data,
299 ISCSI_BOOT_INI_INITIATOR_NAME);
300
301 return 0;
302 }
303
304 static struct attribute_group iscsi_boot_initiator_attr_group = {
305 .attrs = initiator_attrs,
306 .is_visible = iscsi_boot_ini_attr_is_visible,
307 };
308
309 /* iBFT ACPI Table attributes */
310 iscsi_boot_rd_attr(acpitbl_signature, signature, ISCSI_BOOT_ACPITBL_SIGNATURE);
311 iscsi_boot_rd_attr(acpitbl_oem_id, oem_id, ISCSI_BOOT_ACPITBL_OEM_ID);
312 iscsi_boot_rd_attr(acpitbl_oem_table_id, oem_table_id,
313 ISCSI_BOOT_ACPITBL_OEM_TABLE_ID);
314
315 static struct attribute *acpitbl_attrs[] = {
316 &iscsi_boot_attr_acpitbl_signature.attr,
317 &iscsi_boot_attr_acpitbl_oem_id.attr,
318 &iscsi_boot_attr_acpitbl_oem_table_id.attr,
319 NULL
320 };
321
iscsi_boot_acpitbl_attr_is_visible(struct kobject * kobj,struct attribute * attr,int i)322 static umode_t iscsi_boot_acpitbl_attr_is_visible(struct kobject *kobj,
323 struct attribute *attr, int i)
324 {
325 struct iscsi_boot_kobj *boot_kobj =
326 container_of(kobj, struct iscsi_boot_kobj, kobj);
327
328 if (attr == &iscsi_boot_attr_acpitbl_signature.attr)
329 return boot_kobj->is_visible(boot_kobj->data,
330 ISCSI_BOOT_ACPITBL_SIGNATURE);
331 if (attr == &iscsi_boot_attr_acpitbl_oem_id.attr)
332 return boot_kobj->is_visible(boot_kobj->data,
333 ISCSI_BOOT_ACPITBL_OEM_ID);
334 if (attr == &iscsi_boot_attr_acpitbl_oem_table_id.attr)
335 return boot_kobj->is_visible(boot_kobj->data,
336 ISCSI_BOOT_ACPITBL_OEM_TABLE_ID);
337 return 0;
338 }
339
340 static struct attribute_group iscsi_boot_acpitbl_attr_group = {
341 .attrs = acpitbl_attrs,
342 .is_visible = iscsi_boot_acpitbl_attr_is_visible,
343 };
344
345 static struct iscsi_boot_kobj *
iscsi_boot_create_kobj(struct iscsi_boot_kset * boot_kset,struct attribute_group * attr_group,const char * name,int index,void * data,ssize_t (* show)(void * data,int type,char * buf),umode_t (* is_visible)(void * data,int type),void (* release)(void * data))346 iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
347 struct attribute_group *attr_group,
348 const char *name, int index, void *data,
349 ssize_t (*show) (void *data, int type, char *buf),
350 umode_t (*is_visible) (void *data, int type),
351 void (*release) (void *data))
352 {
353 struct iscsi_boot_kobj *boot_kobj;
354
355 boot_kobj = kzalloc(sizeof(*boot_kobj), GFP_KERNEL);
356 if (!boot_kobj)
357 return NULL;
358 INIT_LIST_HEAD(&boot_kobj->list);
359
360 boot_kobj->kobj.kset = boot_kset->kset;
361 if (kobject_init_and_add(&boot_kobj->kobj, &iscsi_boot_ktype,
362 NULL, name, index)) {
363 kfree(boot_kobj);
364 return NULL;
365 }
366 boot_kobj->data = data;
367 boot_kobj->show = show;
368 boot_kobj->is_visible = is_visible;
369 boot_kobj->release = release;
370
371 if (sysfs_create_group(&boot_kobj->kobj, attr_group)) {
372 /*
373 * We do not want to free this because the caller
374 * will assume that since the creation call failed
375 * the boot kobj was not setup and the normal release
376 * path is not being run.
377 */
378 boot_kobj->release = NULL;
379 kobject_put(&boot_kobj->kobj);
380 return NULL;
381 }
382 boot_kobj->attr_group = attr_group;
383
384 kobject_uevent(&boot_kobj->kobj, KOBJ_ADD);
385 /* Nothing broke so lets add it to the list. */
386 list_add_tail(&boot_kobj->list, &boot_kset->kobj_list);
387 return boot_kobj;
388 }
389
iscsi_boot_remove_kobj(struct iscsi_boot_kobj * boot_kobj)390 static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
391 {
392 list_del(&boot_kobj->list);
393 sysfs_remove_group(&boot_kobj->kobj, boot_kobj->attr_group);
394 kobject_put(&boot_kobj->kobj);
395 }
396
397 /**
398 * iscsi_boot_create_target() - create boot target sysfs dir
399 * @boot_kset: boot kset
400 * @index: the target id
401 * @data: driver specific data for target
402 * @show: attr show function
403 * @is_visible: attr visibility function
404 * @release: release function
405 *
406 * Note: The boot sysfs lib will free the data passed in for the caller
407 * when all refs to the target kobject have been released.
408 */
409 struct iscsi_boot_kobj *
iscsi_boot_create_target(struct iscsi_boot_kset * boot_kset,int index,void * data,ssize_t (* show)(void * data,int type,char * buf),umode_t (* is_visible)(void * data,int type),void (* release)(void * data))410 iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
411 void *data,
412 ssize_t (*show) (void *data, int type, char *buf),
413 umode_t (*is_visible) (void *data, int type),
414 void (*release) (void *data))
415 {
416 return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
417 "target%d", index, data, show, is_visible,
418 release);
419 }
420 EXPORT_SYMBOL_GPL(iscsi_boot_create_target);
421
422 /**
423 * iscsi_boot_create_initiator() - create boot initiator sysfs dir
424 * @boot_kset: boot kset
425 * @index: the initiator id
426 * @data: driver specific data
427 * @show: attr show function
428 * @is_visible: attr visibility function
429 * @release: release function
430 *
431 * Note: The boot sysfs lib will free the data passed in for the caller
432 * when all refs to the initiator kobject have been released.
433 */
434 struct iscsi_boot_kobj *
iscsi_boot_create_initiator(struct iscsi_boot_kset * boot_kset,int index,void * data,ssize_t (* show)(void * data,int type,char * buf),umode_t (* is_visible)(void * data,int type),void (* release)(void * data))435 iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
436 void *data,
437 ssize_t (*show) (void *data, int type, char *buf),
438 umode_t (*is_visible) (void *data, int type),
439 void (*release) (void *data))
440 {
441 return iscsi_boot_create_kobj(boot_kset,
442 &iscsi_boot_initiator_attr_group,
443 "initiator", index, data, show,
444 is_visible, release);
445 }
446 EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);
447
448 /**
449 * iscsi_boot_create_ethernet() - create boot ethernet sysfs dir
450 * @boot_kset: boot kset
451 * @index: the ethernet device id
452 * @data: driver specific data
453 * @show: attr show function
454 * @is_visible: attr visibility function
455 * @release: release function
456 *
457 * Note: The boot sysfs lib will free the data passed in for the caller
458 * when all refs to the ethernet kobject have been released.
459 */
460 struct iscsi_boot_kobj *
iscsi_boot_create_ethernet(struct iscsi_boot_kset * boot_kset,int index,void * data,ssize_t (* show)(void * data,int type,char * buf),umode_t (* is_visible)(void * data,int type),void (* release)(void * data))461 iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
462 void *data,
463 ssize_t (*show) (void *data, int type, char *buf),
464 umode_t (*is_visible) (void *data, int type),
465 void (*release) (void *data))
466 {
467 return iscsi_boot_create_kobj(boot_kset,
468 &iscsi_boot_ethernet_attr_group,
469 "ethernet%d", index, data, show,
470 is_visible, release);
471 }
472 EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);
473
474 /**
475 * iscsi_boot_create_acpitbl() - create boot acpi table sysfs dir
476 * @boot_kset: boot kset
477 * @index: not used
478 * @data: driver specific data
479 * @show: attr show function
480 * @is_visible: attr visibility function
481 * @release: release function
482 *
483 * Note: The boot sysfs lib will free the data passed in for the caller
484 * when all refs to the acpitbl kobject have been released.
485 */
486 struct iscsi_boot_kobj *
iscsi_boot_create_acpitbl(struct iscsi_boot_kset * boot_kset,int index,void * data,ssize_t (* show)(void * data,int type,char * buf),umode_t (* is_visible)(void * data,int type),void (* release)(void * data))487 iscsi_boot_create_acpitbl(struct iscsi_boot_kset *boot_kset, int index,
488 void *data,
489 ssize_t (*show)(void *data, int type, char *buf),
490 umode_t (*is_visible)(void *data, int type),
491 void (*release)(void *data))
492 {
493 return iscsi_boot_create_kobj(boot_kset,
494 &iscsi_boot_acpitbl_attr_group,
495 "acpi_header", index, data, show,
496 is_visible, release);
497 }
498 EXPORT_SYMBOL_GPL(iscsi_boot_create_acpitbl);
499
500 /**
501 * iscsi_boot_create_kset() - creates root sysfs tree
502 * @set_name: name of root dir
503 */
iscsi_boot_create_kset(const char * set_name)504 struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name)
505 {
506 struct iscsi_boot_kset *boot_kset;
507
508 boot_kset = kzalloc(sizeof(*boot_kset), GFP_KERNEL);
509 if (!boot_kset)
510 return NULL;
511
512 boot_kset->kset = kset_create_and_add(set_name, NULL, firmware_kobj);
513 if (!boot_kset->kset) {
514 kfree(boot_kset);
515 return NULL;
516 }
517
518 INIT_LIST_HEAD(&boot_kset->kobj_list);
519 return boot_kset;
520 }
521 EXPORT_SYMBOL_GPL(iscsi_boot_create_kset);
522
523 /**
524 * iscsi_boot_create_host_kset() - creates root sysfs tree for a scsi host
525 * @hostno: host number of scsi host
526 */
iscsi_boot_create_host_kset(unsigned int hostno)527 struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno)
528 {
529 struct iscsi_boot_kset *boot_kset;
530 char *set_name;
531
532 set_name = kasprintf(GFP_KERNEL, "iscsi_boot%u", hostno);
533 if (!set_name)
534 return NULL;
535
536 boot_kset = iscsi_boot_create_kset(set_name);
537 kfree(set_name);
538 return boot_kset;
539 }
540 EXPORT_SYMBOL_GPL(iscsi_boot_create_host_kset);
541
542 /**
543 * iscsi_boot_destroy_kset() - destroy kset and kobjects under it
544 * @boot_kset: boot kset
545 *
546 * This will remove the kset and kobjects and attrs under it.
547 */
iscsi_boot_destroy_kset(struct iscsi_boot_kset * boot_kset)548 void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
549 {
550 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
551
552 if (!boot_kset)
553 return;
554
555 list_for_each_entry_safe(boot_kobj, tmp_kobj,
556 &boot_kset->kobj_list, list)
557 iscsi_boot_remove_kobj(boot_kobj);
558
559 kset_unregister(boot_kset->kset);
560 kfree(boot_kset);
561 }
562 EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);
563