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a07b4970 CH |
1 | /* |
2 | * Configfs interface for the NVMe target. | |
3 | * Copyright (c) 2015-2016 HGST, a Western Digital Company. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/stat.h> | |
19 | #include <linux/ctype.h> | |
20 | ||
21 | #include "nvmet.h" | |
22 | ||
23 | static struct config_item_type nvmet_host_type; | |
24 | static struct config_item_type nvmet_subsys_type; | |
25 | ||
26 | /* | |
27 | * nvmet_port Generic ConfigFS definitions. | |
28 | * Used in any place in the ConfigFS tree that refers to an address. | |
29 | */ | |
30 | static ssize_t nvmet_addr_adrfam_show(struct config_item *item, | |
31 | char *page) | |
32 | { | |
33 | switch (to_nvmet_port(item)->disc_addr.adrfam) { | |
34 | case NVMF_ADDR_FAMILY_IP4: | |
35 | return sprintf(page, "ipv4\n"); | |
36 | case NVMF_ADDR_FAMILY_IP6: | |
37 | return sprintf(page, "ipv6\n"); | |
38 | case NVMF_ADDR_FAMILY_IB: | |
39 | return sprintf(page, "ib\n"); | |
40 | default: | |
41 | return sprintf(page, "\n"); | |
42 | } | |
43 | } | |
44 | ||
45 | static ssize_t nvmet_addr_adrfam_store(struct config_item *item, | |
46 | const char *page, size_t count) | |
47 | { | |
48 | struct nvmet_port *port = to_nvmet_port(item); | |
49 | ||
50 | if (port->enabled) { | |
51 | pr_err("Cannot modify address while enabled\n"); | |
52 | pr_err("Disable the address before modifying\n"); | |
53 | return -EACCES; | |
54 | } | |
55 | ||
56 | if (sysfs_streq(page, "ipv4")) { | |
57 | port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IP4; | |
58 | } else if (sysfs_streq(page, "ipv6")) { | |
59 | port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IP6; | |
60 | } else if (sysfs_streq(page, "ib")) { | |
61 | port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IB; | |
62 | } else { | |
63 | pr_err("Invalid value '%s' for adrfam\n", page); | |
64 | return -EINVAL; | |
65 | } | |
66 | ||
67 | return count; | |
68 | } | |
69 | ||
70 | CONFIGFS_ATTR(nvmet_, addr_adrfam); | |
71 | ||
72 | static ssize_t nvmet_addr_portid_show(struct config_item *item, | |
73 | char *page) | |
74 | { | |
75 | struct nvmet_port *port = to_nvmet_port(item); | |
76 | ||
77 | return snprintf(page, PAGE_SIZE, "%d\n", | |
78 | le16_to_cpu(port->disc_addr.portid)); | |
79 | } | |
80 | ||
81 | static ssize_t nvmet_addr_portid_store(struct config_item *item, | |
82 | const char *page, size_t count) | |
83 | { | |
84 | struct nvmet_port *port = to_nvmet_port(item); | |
85 | u16 portid = 0; | |
86 | ||
87 | if (kstrtou16(page, 0, &portid)) { | |
88 | pr_err("Invalid value '%s' for portid\n", page); | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | if (port->enabled) { | |
93 | pr_err("Cannot modify address while enabled\n"); | |
94 | pr_err("Disable the address before modifying\n"); | |
95 | return -EACCES; | |
96 | } | |
97 | port->disc_addr.portid = cpu_to_le16(portid); | |
98 | return count; | |
99 | } | |
100 | ||
101 | CONFIGFS_ATTR(nvmet_, addr_portid); | |
102 | ||
103 | static ssize_t nvmet_addr_traddr_show(struct config_item *item, | |
104 | char *page) | |
105 | { | |
106 | struct nvmet_port *port = to_nvmet_port(item); | |
107 | ||
108 | return snprintf(page, PAGE_SIZE, "%s\n", | |
109 | port->disc_addr.traddr); | |
110 | } | |
111 | ||
112 | static ssize_t nvmet_addr_traddr_store(struct config_item *item, | |
113 | const char *page, size_t count) | |
114 | { | |
115 | struct nvmet_port *port = to_nvmet_port(item); | |
116 | ||
117 | if (count > NVMF_TRADDR_SIZE) { | |
118 | pr_err("Invalid value '%s' for traddr\n", page); | |
119 | return -EINVAL; | |
120 | } | |
121 | ||
122 | if (port->enabled) { | |
123 | pr_err("Cannot modify address while enabled\n"); | |
124 | pr_err("Disable the address before modifying\n"); | |
125 | return -EACCES; | |
126 | } | |
127 | return snprintf(port->disc_addr.traddr, | |
128 | sizeof(port->disc_addr.traddr), "%s", page); | |
129 | } | |
130 | ||
131 | CONFIGFS_ATTR(nvmet_, addr_traddr); | |
132 | ||
133 | static ssize_t nvmet_addr_treq_show(struct config_item *item, | |
134 | char *page) | |
135 | { | |
136 | switch (to_nvmet_port(item)->disc_addr.treq) { | |
137 | case NVMF_TREQ_NOT_SPECIFIED: | |
138 | return sprintf(page, "not specified\n"); | |
139 | case NVMF_TREQ_REQUIRED: | |
140 | return sprintf(page, "required\n"); | |
141 | case NVMF_TREQ_NOT_REQUIRED: | |
142 | return sprintf(page, "not required\n"); | |
143 | default: | |
144 | return sprintf(page, "\n"); | |
145 | } | |
146 | } | |
147 | ||
148 | static ssize_t nvmet_addr_treq_store(struct config_item *item, | |
149 | const char *page, size_t count) | |
150 | { | |
151 | struct nvmet_port *port = to_nvmet_port(item); | |
152 | ||
153 | if (port->enabled) { | |
154 | pr_err("Cannot modify address while enabled\n"); | |
155 | pr_err("Disable the address before modifying\n"); | |
156 | return -EACCES; | |
157 | } | |
158 | ||
159 | if (sysfs_streq(page, "not specified")) { | |
160 | port->disc_addr.treq = NVMF_TREQ_NOT_SPECIFIED; | |
161 | } else if (sysfs_streq(page, "required")) { | |
162 | port->disc_addr.treq = NVMF_TREQ_REQUIRED; | |
163 | } else if (sysfs_streq(page, "not required")) { | |
164 | port->disc_addr.treq = NVMF_TREQ_NOT_REQUIRED; | |
165 | } else { | |
166 | pr_err("Invalid value '%s' for treq\n", page); | |
167 | return -EINVAL; | |
168 | } | |
169 | ||
170 | return count; | |
171 | } | |
172 | ||
173 | CONFIGFS_ATTR(nvmet_, addr_treq); | |
174 | ||
175 | static ssize_t nvmet_addr_trsvcid_show(struct config_item *item, | |
176 | char *page) | |
177 | { | |
178 | struct nvmet_port *port = to_nvmet_port(item); | |
179 | ||
180 | return snprintf(page, PAGE_SIZE, "%s\n", | |
181 | port->disc_addr.trsvcid); | |
182 | } | |
183 | ||
184 | static ssize_t nvmet_addr_trsvcid_store(struct config_item *item, | |
185 | const char *page, size_t count) | |
186 | { | |
187 | struct nvmet_port *port = to_nvmet_port(item); | |
188 | ||
189 | if (count > NVMF_TRSVCID_SIZE) { | |
190 | pr_err("Invalid value '%s' for trsvcid\n", page); | |
191 | return -EINVAL; | |
192 | } | |
193 | if (port->enabled) { | |
194 | pr_err("Cannot modify address while enabled\n"); | |
195 | pr_err("Disable the address before modifying\n"); | |
196 | return -EACCES; | |
197 | } | |
198 | return snprintf(port->disc_addr.trsvcid, | |
199 | sizeof(port->disc_addr.trsvcid), "%s", page); | |
200 | } | |
201 | ||
202 | CONFIGFS_ATTR(nvmet_, addr_trsvcid); | |
203 | ||
204 | static ssize_t nvmet_addr_trtype_show(struct config_item *item, | |
205 | char *page) | |
206 | { | |
207 | switch (to_nvmet_port(item)->disc_addr.trtype) { | |
208 | case NVMF_TRTYPE_RDMA: | |
209 | return sprintf(page, "rdma\n"); | |
210 | case NVMF_TRTYPE_LOOP: | |
211 | return sprintf(page, "loop\n"); | |
212 | default: | |
213 | return sprintf(page, "\n"); | |
214 | } | |
215 | } | |
216 | ||
217 | static void nvmet_port_init_tsas_rdma(struct nvmet_port *port) | |
218 | { | |
219 | port->disc_addr.trtype = NVMF_TRTYPE_RDMA; | |
220 | memset(&port->disc_addr.tsas.rdma, 0, NVMF_TSAS_SIZE); | |
221 | port->disc_addr.tsas.rdma.qptype = NVMF_RDMA_QPTYPE_CONNECTED; | |
222 | port->disc_addr.tsas.rdma.prtype = NVMF_RDMA_PRTYPE_NOT_SPECIFIED; | |
223 | port->disc_addr.tsas.rdma.cms = NVMF_RDMA_CMS_RDMA_CM; | |
224 | } | |
225 | ||
226 | static void nvmet_port_init_tsas_loop(struct nvmet_port *port) | |
227 | { | |
228 | port->disc_addr.trtype = NVMF_TRTYPE_LOOP; | |
229 | memset(&port->disc_addr.tsas, 0, NVMF_TSAS_SIZE); | |
230 | } | |
231 | ||
232 | static ssize_t nvmet_addr_trtype_store(struct config_item *item, | |
233 | const char *page, size_t count) | |
234 | { | |
235 | struct nvmet_port *port = to_nvmet_port(item); | |
236 | ||
237 | if (port->enabled) { | |
238 | pr_err("Cannot modify address while enabled\n"); | |
239 | pr_err("Disable the address before modifying\n"); | |
240 | return -EACCES; | |
241 | } | |
242 | ||
243 | if (sysfs_streq(page, "rdma")) { | |
244 | nvmet_port_init_tsas_rdma(port); | |
245 | } else if (sysfs_streq(page, "loop")) { | |
246 | nvmet_port_init_tsas_loop(port); | |
247 | } else { | |
248 | pr_err("Invalid value '%s' for trtype\n", page); | |
249 | return -EINVAL; | |
250 | } | |
251 | ||
252 | return count; | |
253 | } | |
254 | ||
255 | CONFIGFS_ATTR(nvmet_, addr_trtype); | |
256 | ||
257 | /* | |
258 | * Namespace structures & file operation functions below | |
259 | */ | |
260 | static ssize_t nvmet_ns_device_path_show(struct config_item *item, char *page) | |
261 | { | |
262 | return sprintf(page, "%s\n", to_nvmet_ns(item)->device_path); | |
263 | } | |
264 | ||
265 | static ssize_t nvmet_ns_device_path_store(struct config_item *item, | |
266 | const char *page, size_t count) | |
267 | { | |
268 | struct nvmet_ns *ns = to_nvmet_ns(item); | |
269 | struct nvmet_subsys *subsys = ns->subsys; | |
270 | int ret; | |
271 | ||
272 | mutex_lock(&subsys->lock); | |
273 | ret = -EBUSY; | |
274 | if (nvmet_ns_enabled(ns)) | |
275 | goto out_unlock; | |
276 | ||
277 | kfree(ns->device_path); | |
278 | ||
279 | ret = -ENOMEM; | |
280 | ns->device_path = kstrdup(page, GFP_KERNEL); | |
281 | if (!ns->device_path) | |
282 | goto out_unlock; | |
283 | ||
284 | mutex_unlock(&subsys->lock); | |
285 | return count; | |
286 | ||
287 | out_unlock: | |
288 | mutex_unlock(&subsys->lock); | |
289 | return ret; | |
290 | } | |
291 | ||
292 | CONFIGFS_ATTR(nvmet_ns_, device_path); | |
293 | ||
294 | static ssize_t nvmet_ns_device_nguid_show(struct config_item *item, char *page) | |
295 | { | |
296 | return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->nguid); | |
297 | } | |
298 | ||
299 | static ssize_t nvmet_ns_device_nguid_store(struct config_item *item, | |
300 | const char *page, size_t count) | |
301 | { | |
302 | struct nvmet_ns *ns = to_nvmet_ns(item); | |
303 | struct nvmet_subsys *subsys = ns->subsys; | |
304 | u8 nguid[16]; | |
305 | const char *p = page; | |
306 | int i; | |
307 | int ret = 0; | |
308 | ||
309 | mutex_lock(&subsys->lock); | |
310 | if (nvmet_ns_enabled(ns)) { | |
311 | ret = -EBUSY; | |
312 | goto out_unlock; | |
313 | } | |
314 | ||
315 | for (i = 0; i < 16; i++) { | |
316 | if (p + 2 > page + count) { | |
317 | ret = -EINVAL; | |
318 | goto out_unlock; | |
319 | } | |
320 | if (!isxdigit(p[0]) || !isxdigit(p[1])) { | |
321 | ret = -EINVAL; | |
322 | goto out_unlock; | |
323 | } | |
324 | ||
325 | nguid[i] = (hex_to_bin(p[0]) << 4) | hex_to_bin(p[1]); | |
326 | p += 2; | |
327 | ||
328 | if (*p == '-' || *p == ':') | |
329 | p++; | |
330 | } | |
331 | ||
332 | memcpy(&ns->nguid, nguid, sizeof(nguid)); | |
333 | out_unlock: | |
334 | mutex_unlock(&subsys->lock); | |
335 | return ret ? ret : count; | |
336 | } | |
337 | ||
338 | CONFIGFS_ATTR(nvmet_ns_, device_nguid); | |
339 | ||
340 | static ssize_t nvmet_ns_enable_show(struct config_item *item, char *page) | |
341 | { | |
342 | return sprintf(page, "%d\n", nvmet_ns_enabled(to_nvmet_ns(item))); | |
343 | } | |
344 | ||
345 | static ssize_t nvmet_ns_enable_store(struct config_item *item, | |
346 | const char *page, size_t count) | |
347 | { | |
348 | struct nvmet_ns *ns = to_nvmet_ns(item); | |
349 | bool enable; | |
350 | int ret = 0; | |
351 | ||
352 | if (strtobool(page, &enable)) | |
353 | return -EINVAL; | |
354 | ||
355 | if (enable) | |
356 | ret = nvmet_ns_enable(ns); | |
357 | else | |
358 | nvmet_ns_disable(ns); | |
359 | ||
360 | return ret ? ret : count; | |
361 | } | |
362 | ||
363 | CONFIGFS_ATTR(nvmet_ns_, enable); | |
364 | ||
365 | static struct configfs_attribute *nvmet_ns_attrs[] = { | |
366 | &nvmet_ns_attr_device_path, | |
367 | &nvmet_ns_attr_device_nguid, | |
368 | &nvmet_ns_attr_enable, | |
369 | NULL, | |
370 | }; | |
371 | ||
372 | static void nvmet_ns_release(struct config_item *item) | |
373 | { | |
374 | struct nvmet_ns *ns = to_nvmet_ns(item); | |
375 | ||
376 | nvmet_ns_free(ns); | |
377 | } | |
378 | ||
379 | static struct configfs_item_operations nvmet_ns_item_ops = { | |
380 | .release = nvmet_ns_release, | |
381 | }; | |
382 | ||
383 | static struct config_item_type nvmet_ns_type = { | |
384 | .ct_item_ops = &nvmet_ns_item_ops, | |
385 | .ct_attrs = nvmet_ns_attrs, | |
386 | .ct_owner = THIS_MODULE, | |
387 | }; | |
388 | ||
389 | static struct config_group *nvmet_ns_make(struct config_group *group, | |
390 | const char *name) | |
391 | { | |
392 | struct nvmet_subsys *subsys = namespaces_to_subsys(&group->cg_item); | |
393 | struct nvmet_ns *ns; | |
394 | int ret; | |
395 | u32 nsid; | |
396 | ||
397 | ret = kstrtou32(name, 0, &nsid); | |
398 | if (ret) | |
399 | goto out; | |
400 | ||
401 | ret = -EINVAL; | |
402 | if (nsid == 0 || nsid == 0xffffffff) | |
403 | goto out; | |
404 | ||
405 | ret = -ENOMEM; | |
406 | ns = nvmet_ns_alloc(subsys, nsid); | |
407 | if (!ns) | |
408 | goto out; | |
409 | config_group_init_type_name(&ns->group, name, &nvmet_ns_type); | |
410 | ||
411 | pr_info("adding nsid %d to subsystem %s\n", nsid, subsys->subsysnqn); | |
412 | ||
413 | return &ns->group; | |
414 | out: | |
415 | return ERR_PTR(ret); | |
416 | } | |
417 | ||
418 | static struct configfs_group_operations nvmet_namespaces_group_ops = { | |
419 | .make_group = nvmet_ns_make, | |
420 | }; | |
421 | ||
422 | static struct config_item_type nvmet_namespaces_type = { | |
423 | .ct_group_ops = &nvmet_namespaces_group_ops, | |
424 | .ct_owner = THIS_MODULE, | |
425 | }; | |
426 | ||
427 | static int nvmet_port_subsys_allow_link(struct config_item *parent, | |
428 | struct config_item *target) | |
429 | { | |
430 | struct nvmet_port *port = to_nvmet_port(parent->ci_parent); | |
431 | struct nvmet_subsys *subsys; | |
432 | struct nvmet_subsys_link *link, *p; | |
433 | int ret; | |
434 | ||
435 | if (target->ci_type != &nvmet_subsys_type) { | |
436 | pr_err("can only link subsystems into the subsystems dir.!\n"); | |
437 | return -EINVAL; | |
438 | } | |
439 | subsys = to_subsys(target); | |
440 | link = kmalloc(sizeof(*link), GFP_KERNEL); | |
441 | if (!link) | |
442 | return -ENOMEM; | |
443 | link->subsys = subsys; | |
444 | ||
445 | down_write(&nvmet_config_sem); | |
446 | ret = -EEXIST; | |
447 | list_for_each_entry(p, &port->subsystems, entry) { | |
448 | if (p->subsys == subsys) | |
449 | goto out_free_link; | |
450 | } | |
451 | ||
452 | if (list_empty(&port->subsystems)) { | |
453 | ret = nvmet_enable_port(port); | |
454 | if (ret) | |
455 | goto out_free_link; | |
456 | } | |
457 | ||
458 | list_add_tail(&link->entry, &port->subsystems); | |
459 | nvmet_genctr++; | |
460 | up_write(&nvmet_config_sem); | |
461 | return 0; | |
462 | ||
463 | out_free_link: | |
464 | up_write(&nvmet_config_sem); | |
465 | kfree(link); | |
466 | return ret; | |
467 | } | |
468 | ||
469 | static int nvmet_port_subsys_drop_link(struct config_item *parent, | |
470 | struct config_item *target) | |
471 | { | |
472 | struct nvmet_port *port = to_nvmet_port(parent->ci_parent); | |
473 | struct nvmet_subsys *subsys = to_subsys(target); | |
474 | struct nvmet_subsys_link *p; | |
475 | ||
476 | down_write(&nvmet_config_sem); | |
477 | list_for_each_entry(p, &port->subsystems, entry) { | |
478 | if (p->subsys == subsys) | |
479 | goto found; | |
480 | } | |
481 | up_write(&nvmet_config_sem); | |
482 | return -EINVAL; | |
483 | ||
484 | found: | |
485 | list_del(&p->entry); | |
486 | nvmet_genctr++; | |
487 | if (list_empty(&port->subsystems)) | |
488 | nvmet_disable_port(port); | |
489 | up_write(&nvmet_config_sem); | |
490 | kfree(p); | |
491 | return 0; | |
492 | } | |
493 | ||
494 | static struct configfs_item_operations nvmet_port_subsys_item_ops = { | |
495 | .allow_link = nvmet_port_subsys_allow_link, | |
496 | .drop_link = nvmet_port_subsys_drop_link, | |
497 | }; | |
498 | ||
499 | static struct config_item_type nvmet_port_subsys_type = { | |
500 | .ct_item_ops = &nvmet_port_subsys_item_ops, | |
501 | .ct_owner = THIS_MODULE, | |
502 | }; | |
503 | ||
504 | static int nvmet_allowed_hosts_allow_link(struct config_item *parent, | |
505 | struct config_item *target) | |
506 | { | |
507 | struct nvmet_subsys *subsys = to_subsys(parent->ci_parent); | |
508 | struct nvmet_host *host; | |
509 | struct nvmet_host_link *link, *p; | |
510 | int ret; | |
511 | ||
512 | if (target->ci_type != &nvmet_host_type) { | |
513 | pr_err("can only link hosts into the allowed_hosts directory!\n"); | |
514 | return -EINVAL; | |
515 | } | |
516 | ||
517 | host = to_host(target); | |
518 | link = kmalloc(sizeof(*link), GFP_KERNEL); | |
519 | if (!link) | |
520 | return -ENOMEM; | |
521 | link->host = host; | |
522 | ||
523 | down_write(&nvmet_config_sem); | |
524 | ret = -EINVAL; | |
525 | if (subsys->allow_any_host) { | |
526 | pr_err("can't add hosts when allow_any_host is set!\n"); | |
527 | goto out_free_link; | |
528 | } | |
529 | ||
530 | ret = -EEXIST; | |
531 | list_for_each_entry(p, &subsys->hosts, entry) { | |
532 | if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host))) | |
533 | goto out_free_link; | |
534 | } | |
535 | list_add_tail(&link->entry, &subsys->hosts); | |
536 | nvmet_genctr++; | |
537 | up_write(&nvmet_config_sem); | |
538 | return 0; | |
539 | out_free_link: | |
540 | up_write(&nvmet_config_sem); | |
541 | kfree(link); | |
542 | return ret; | |
543 | } | |
544 | ||
545 | static int nvmet_allowed_hosts_drop_link(struct config_item *parent, | |
546 | struct config_item *target) | |
547 | { | |
548 | struct nvmet_subsys *subsys = to_subsys(parent->ci_parent); | |
549 | struct nvmet_host *host = to_host(target); | |
550 | struct nvmet_host_link *p; | |
551 | ||
552 | down_write(&nvmet_config_sem); | |
553 | list_for_each_entry(p, &subsys->hosts, entry) { | |
554 | if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host))) | |
555 | goto found; | |
556 | } | |
557 | up_write(&nvmet_config_sem); | |
558 | return -EINVAL; | |
559 | ||
560 | found: | |
561 | list_del(&p->entry); | |
562 | nvmet_genctr++; | |
563 | up_write(&nvmet_config_sem); | |
564 | kfree(p); | |
565 | return 0; | |
566 | } | |
567 | ||
568 | static struct configfs_item_operations nvmet_allowed_hosts_item_ops = { | |
569 | .allow_link = nvmet_allowed_hosts_allow_link, | |
570 | .drop_link = nvmet_allowed_hosts_drop_link, | |
571 | }; | |
572 | ||
573 | static struct config_item_type nvmet_allowed_hosts_type = { | |
574 | .ct_item_ops = &nvmet_allowed_hosts_item_ops, | |
575 | .ct_owner = THIS_MODULE, | |
576 | }; | |
577 | ||
578 | static ssize_t nvmet_subsys_attr_allow_any_host_show(struct config_item *item, | |
579 | char *page) | |
580 | { | |
581 | return snprintf(page, PAGE_SIZE, "%d\n", | |
582 | to_subsys(item)->allow_any_host); | |
583 | } | |
584 | ||
585 | static ssize_t nvmet_subsys_attr_allow_any_host_store(struct config_item *item, | |
586 | const char *page, size_t count) | |
587 | { | |
588 | struct nvmet_subsys *subsys = to_subsys(item); | |
589 | bool allow_any_host; | |
590 | int ret = 0; | |
591 | ||
592 | if (strtobool(page, &allow_any_host)) | |
593 | return -EINVAL; | |
594 | ||
595 | down_write(&nvmet_config_sem); | |
596 | if (allow_any_host && !list_empty(&subsys->hosts)) { | |
597 | pr_err("Can't set allow_any_host when explicit hosts are set!\n"); | |
598 | ret = -EINVAL; | |
599 | goto out_unlock; | |
600 | } | |
601 | ||
602 | subsys->allow_any_host = allow_any_host; | |
603 | out_unlock: | |
604 | up_write(&nvmet_config_sem); | |
605 | return ret ? ret : count; | |
606 | } | |
607 | ||
608 | CONFIGFS_ATTR(nvmet_subsys_, attr_allow_any_host); | |
609 | ||
610 | static struct configfs_attribute *nvmet_subsys_attrs[] = { | |
611 | &nvmet_subsys_attr_attr_allow_any_host, | |
612 | NULL, | |
613 | }; | |
614 | ||
615 | /* | |
616 | * Subsystem structures & folder operation functions below | |
617 | */ | |
618 | static void nvmet_subsys_release(struct config_item *item) | |
619 | { | |
620 | struct nvmet_subsys *subsys = to_subsys(item); | |
621 | ||
622 | nvmet_subsys_put(subsys); | |
623 | } | |
624 | ||
625 | static struct configfs_item_operations nvmet_subsys_item_ops = { | |
626 | .release = nvmet_subsys_release, | |
627 | }; | |
628 | ||
629 | static struct config_item_type nvmet_subsys_type = { | |
630 | .ct_item_ops = &nvmet_subsys_item_ops, | |
631 | .ct_attrs = nvmet_subsys_attrs, | |
632 | .ct_owner = THIS_MODULE, | |
633 | }; | |
634 | ||
635 | static struct config_group *nvmet_subsys_make(struct config_group *group, | |
636 | const char *name) | |
637 | { | |
638 | struct nvmet_subsys *subsys; | |
639 | ||
640 | if (sysfs_streq(name, NVME_DISC_SUBSYS_NAME)) { | |
641 | pr_err("can't create discovery subsystem through configfs\n"); | |
642 | return ERR_PTR(-EINVAL); | |
643 | } | |
644 | ||
645 | subsys = nvmet_subsys_alloc(name, NVME_NQN_NVME); | |
646 | if (!subsys) | |
647 | return ERR_PTR(-ENOMEM); | |
648 | ||
649 | config_group_init_type_name(&subsys->group, name, &nvmet_subsys_type); | |
650 | ||
651 | config_group_init_type_name(&subsys->namespaces_group, | |
652 | "namespaces", &nvmet_namespaces_type); | |
653 | configfs_add_default_group(&subsys->namespaces_group, &subsys->group); | |
654 | ||
655 | config_group_init_type_name(&subsys->allowed_hosts_group, | |
656 | "allowed_hosts", &nvmet_allowed_hosts_type); | |
657 | configfs_add_default_group(&subsys->allowed_hosts_group, | |
658 | &subsys->group); | |
659 | ||
660 | return &subsys->group; | |
661 | } | |
662 | ||
663 | static struct configfs_group_operations nvmet_subsystems_group_ops = { | |
664 | .make_group = nvmet_subsys_make, | |
665 | }; | |
666 | ||
667 | static struct config_item_type nvmet_subsystems_type = { | |
668 | .ct_group_ops = &nvmet_subsystems_group_ops, | |
669 | .ct_owner = THIS_MODULE, | |
670 | }; | |
671 | ||
672 | static ssize_t nvmet_referral_enable_show(struct config_item *item, | |
673 | char *page) | |
674 | { | |
675 | return snprintf(page, PAGE_SIZE, "%d\n", to_nvmet_port(item)->enabled); | |
676 | } | |
677 | ||
678 | static ssize_t nvmet_referral_enable_store(struct config_item *item, | |
679 | const char *page, size_t count) | |
680 | { | |
681 | struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent); | |
682 | struct nvmet_port *port = to_nvmet_port(item); | |
683 | bool enable; | |
684 | ||
685 | if (strtobool(page, &enable)) | |
686 | goto inval; | |
687 | ||
688 | if (enable) | |
689 | nvmet_referral_enable(parent, port); | |
690 | else | |
691 | nvmet_referral_disable(port); | |
692 | ||
693 | return count; | |
694 | inval: | |
695 | pr_err("Invalid value '%s' for enable\n", page); | |
696 | return -EINVAL; | |
697 | } | |
698 | ||
699 | CONFIGFS_ATTR(nvmet_referral_, enable); | |
700 | ||
701 | /* | |
702 | * Discovery Service subsystem definitions | |
703 | */ | |
704 | static struct configfs_attribute *nvmet_referral_attrs[] = { | |
705 | &nvmet_attr_addr_adrfam, | |
706 | &nvmet_attr_addr_portid, | |
707 | &nvmet_attr_addr_treq, | |
708 | &nvmet_attr_addr_traddr, | |
709 | &nvmet_attr_addr_trsvcid, | |
710 | &nvmet_attr_addr_trtype, | |
711 | &nvmet_referral_attr_enable, | |
712 | NULL, | |
713 | }; | |
714 | ||
715 | static void nvmet_referral_release(struct config_item *item) | |
716 | { | |
717 | struct nvmet_port *port = to_nvmet_port(item); | |
718 | ||
719 | nvmet_referral_disable(port); | |
720 | kfree(port); | |
721 | } | |
722 | ||
723 | static struct configfs_item_operations nvmet_referral_item_ops = { | |
724 | .release = nvmet_referral_release, | |
725 | }; | |
726 | ||
727 | static struct config_item_type nvmet_referral_type = { | |
728 | .ct_owner = THIS_MODULE, | |
729 | .ct_attrs = nvmet_referral_attrs, | |
730 | .ct_item_ops = &nvmet_referral_item_ops, | |
731 | }; | |
732 | ||
733 | static struct config_group *nvmet_referral_make( | |
734 | struct config_group *group, const char *name) | |
735 | { | |
736 | struct nvmet_port *port; | |
737 | ||
738 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
739 | if (!port) | |
740 | return ERR_CAST(port); | |
741 | ||
742 | INIT_LIST_HEAD(&port->entry); | |
743 | config_group_init_type_name(&port->group, name, &nvmet_referral_type); | |
744 | ||
745 | return &port->group; | |
746 | } | |
747 | ||
748 | static struct configfs_group_operations nvmet_referral_group_ops = { | |
749 | .make_group = nvmet_referral_make, | |
750 | }; | |
751 | ||
752 | static struct config_item_type nvmet_referrals_type = { | |
753 | .ct_owner = THIS_MODULE, | |
754 | .ct_group_ops = &nvmet_referral_group_ops, | |
755 | }; | |
756 | ||
757 | /* | |
758 | * Ports definitions. | |
759 | */ | |
760 | static void nvmet_port_release(struct config_item *item) | |
761 | { | |
762 | struct nvmet_port *port = to_nvmet_port(item); | |
763 | ||
764 | kfree(port); | |
765 | } | |
766 | ||
767 | static struct configfs_attribute *nvmet_port_attrs[] = { | |
768 | &nvmet_attr_addr_adrfam, | |
769 | &nvmet_attr_addr_treq, | |
770 | &nvmet_attr_addr_traddr, | |
771 | &nvmet_attr_addr_trsvcid, | |
772 | &nvmet_attr_addr_trtype, | |
773 | NULL, | |
774 | }; | |
775 | ||
776 | static struct configfs_item_operations nvmet_port_item_ops = { | |
777 | .release = nvmet_port_release, | |
778 | }; | |
779 | ||
780 | static struct config_item_type nvmet_port_type = { | |
781 | .ct_attrs = nvmet_port_attrs, | |
782 | .ct_item_ops = &nvmet_port_item_ops, | |
783 | .ct_owner = THIS_MODULE, | |
784 | }; | |
785 | ||
786 | static struct config_group *nvmet_ports_make(struct config_group *group, | |
787 | const char *name) | |
788 | { | |
789 | struct nvmet_port *port; | |
790 | u16 portid; | |
791 | ||
792 | if (kstrtou16(name, 0, &portid)) | |
793 | return ERR_PTR(-EINVAL); | |
794 | ||
795 | port = kzalloc(sizeof(*port), GFP_KERNEL); | |
796 | if (!port) | |
797 | return ERR_CAST(port); | |
798 | ||
799 | INIT_LIST_HEAD(&port->entry); | |
800 | INIT_LIST_HEAD(&port->subsystems); | |
801 | INIT_LIST_HEAD(&port->referrals); | |
802 | ||
803 | port->disc_addr.portid = cpu_to_le16(portid); | |
804 | config_group_init_type_name(&port->group, name, &nvmet_port_type); | |
805 | ||
806 | config_group_init_type_name(&port->subsys_group, | |
807 | "subsystems", &nvmet_port_subsys_type); | |
808 | configfs_add_default_group(&port->subsys_group, &port->group); | |
809 | ||
810 | config_group_init_type_name(&port->referrals_group, | |
811 | "referrals", &nvmet_referrals_type); | |
812 | configfs_add_default_group(&port->referrals_group, &port->group); | |
813 | ||
814 | return &port->group; | |
815 | } | |
816 | ||
817 | static struct configfs_group_operations nvmet_ports_group_ops = { | |
818 | .make_group = nvmet_ports_make, | |
819 | }; | |
820 | ||
821 | static struct config_item_type nvmet_ports_type = { | |
822 | .ct_group_ops = &nvmet_ports_group_ops, | |
823 | .ct_owner = THIS_MODULE, | |
824 | }; | |
825 | ||
826 | static struct config_group nvmet_subsystems_group; | |
827 | static struct config_group nvmet_ports_group; | |
828 | ||
829 | static void nvmet_host_release(struct config_item *item) | |
830 | { | |
831 | struct nvmet_host *host = to_host(item); | |
832 | ||
833 | kfree(host); | |
834 | } | |
835 | ||
836 | static struct configfs_item_operations nvmet_host_item_ops = { | |
837 | .release = nvmet_host_release, | |
838 | }; | |
839 | ||
840 | static struct config_item_type nvmet_host_type = { | |
841 | .ct_item_ops = &nvmet_host_item_ops, | |
842 | .ct_owner = THIS_MODULE, | |
843 | }; | |
844 | ||
845 | static struct config_group *nvmet_hosts_make_group(struct config_group *group, | |
846 | const char *name) | |
847 | { | |
848 | struct nvmet_host *host; | |
849 | ||
850 | host = kzalloc(sizeof(*host), GFP_KERNEL); | |
851 | if (!host) | |
852 | return ERR_PTR(-ENOMEM); | |
853 | ||
854 | config_group_init_type_name(&host->group, name, &nvmet_host_type); | |
855 | ||
856 | return &host->group; | |
857 | } | |
858 | ||
859 | static struct configfs_group_operations nvmet_hosts_group_ops = { | |
860 | .make_group = nvmet_hosts_make_group, | |
861 | }; | |
862 | ||
863 | static struct config_item_type nvmet_hosts_type = { | |
864 | .ct_group_ops = &nvmet_hosts_group_ops, | |
865 | .ct_owner = THIS_MODULE, | |
866 | }; | |
867 | ||
868 | static struct config_group nvmet_hosts_group; | |
869 | ||
870 | static struct config_item_type nvmet_root_type = { | |
871 | .ct_owner = THIS_MODULE, | |
872 | }; | |
873 | ||
874 | static struct configfs_subsystem nvmet_configfs_subsystem = { | |
875 | .su_group = { | |
876 | .cg_item = { | |
877 | .ci_namebuf = "nvmet", | |
878 | .ci_type = &nvmet_root_type, | |
879 | }, | |
880 | }, | |
881 | }; | |
882 | ||
883 | int __init nvmet_init_configfs(void) | |
884 | { | |
885 | int ret; | |
886 | ||
887 | config_group_init(&nvmet_configfs_subsystem.su_group); | |
888 | mutex_init(&nvmet_configfs_subsystem.su_mutex); | |
889 | ||
890 | config_group_init_type_name(&nvmet_subsystems_group, | |
891 | "subsystems", &nvmet_subsystems_type); | |
892 | configfs_add_default_group(&nvmet_subsystems_group, | |
893 | &nvmet_configfs_subsystem.su_group); | |
894 | ||
895 | config_group_init_type_name(&nvmet_ports_group, | |
896 | "ports", &nvmet_ports_type); | |
897 | configfs_add_default_group(&nvmet_ports_group, | |
898 | &nvmet_configfs_subsystem.su_group); | |
899 | ||
900 | config_group_init_type_name(&nvmet_hosts_group, | |
901 | "hosts", &nvmet_hosts_type); | |
902 | configfs_add_default_group(&nvmet_hosts_group, | |
903 | &nvmet_configfs_subsystem.su_group); | |
904 | ||
905 | ret = configfs_register_subsystem(&nvmet_configfs_subsystem); | |
906 | if (ret) { | |
907 | pr_err("configfs_register_subsystem: %d\n", ret); | |
908 | return ret; | |
909 | } | |
910 | ||
911 | return 0; | |
912 | } | |
913 | ||
914 | void __exit nvmet_exit_configfs(void) | |
915 | { | |
916 | configfs_unregister_subsystem(&nvmet_configfs_subsystem); | |
917 | } |