Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_tpg.c | |
3 | * | |
4 | * This file contains generic Target Portal Group related functions. | |
5 | * | |
4c76251e | 6 | * (c) Copyright 2002-2013 Datera, Inc. |
c66ac9db NB |
7 | * |
8 | * Nicholas A. Bellinger <nab@kernel.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | * | |
24 | ******************************************************************************/ | |
25 | ||
26 | #include <linux/net.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/timer.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/spinlock.h> | |
c66ac9db | 31 | #include <linux/in.h> |
c53181af | 32 | #include <linux/export.h> |
c66ac9db NB |
33 | #include <net/sock.h> |
34 | #include <net/tcp.h> | |
ba929992 | 35 | #include <scsi/scsi_proto.h> |
c66ac9db NB |
36 | |
37 | #include <target/target_core_base.h> | |
c4795fb2 CH |
38 | #include <target/target_core_backend.h> |
39 | #include <target/target_core_fabric.h> | |
c66ac9db | 40 | |
e26d99ae | 41 | #include "target_core_internal.h" |
adf653f9 | 42 | #include "target_core_alua.h" |
e2480563 | 43 | #include "target_core_pr.h" |
e986a35a | 44 | #include "target_core_ua.h" |
e3d6f909 AG |
45 | |
46 | extern struct se_device *g_lun0_dev; | |
47 | ||
48 | static DEFINE_SPINLOCK(tpg_lock); | |
49 | static LIST_HEAD(tpg_list); | |
c66ac9db | 50 | |
c66ac9db NB |
51 | /* __core_tpg_get_initiator_node_acl(): |
52 | * | |
403edd78 | 53 | * mutex_lock(&tpg->acl_node_mutex); must be held when calling |
c66ac9db NB |
54 | */ |
55 | struct se_node_acl *__core_tpg_get_initiator_node_acl( | |
56 | struct se_portal_group *tpg, | |
57 | const char *initiatorname) | |
58 | { | |
59 | struct se_node_acl *acl; | |
60 | ||
61 | list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { | |
6708bb27 | 62 | if (!strcmp(acl->initiatorname, initiatorname)) |
c66ac9db NB |
63 | return acl; |
64 | } | |
65 | ||
66 | return NULL; | |
67 | } | |
68 | ||
69 | /* core_tpg_get_initiator_node_acl(): | |
70 | * | |
71 | * | |
72 | */ | |
73 | struct se_node_acl *core_tpg_get_initiator_node_acl( | |
74 | struct se_portal_group *tpg, | |
75 | unsigned char *initiatorname) | |
76 | { | |
77 | struct se_node_acl *acl; | |
21aaa23b NB |
78 | /* |
79 | * Obtain se_node_acl->acl_kref using fabric driver provided | |
80 | * initiatorname[] during node acl endpoint lookup driven by | |
81 | * new se_session login. | |
82 | * | |
83 | * The reference is held until se_session shutdown -> release | |
84 | * occurs via fabric driver invoked transport_deregister_session() | |
85 | * or transport_free_session() code. | |
86 | */ | |
403edd78 | 87 | mutex_lock(&tpg->acl_node_mutex); |
fcf29481 | 88 | acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); |
21aaa23b NB |
89 | if (acl) { |
90 | if (!kref_get_unless_zero(&acl->acl_kref)) | |
91 | acl = NULL; | |
92 | } | |
403edd78 | 93 | mutex_unlock(&tpg->acl_node_mutex); |
c66ac9db | 94 | |
fcf29481 | 95 | return acl; |
c66ac9db | 96 | } |
b3fde035 | 97 | EXPORT_SYMBOL(core_tpg_get_initiator_node_acl); |
c66ac9db | 98 | |
e986a35a HR |
99 | void core_allocate_nexus_loss_ua( |
100 | struct se_node_acl *nacl) | |
101 | { | |
102 | struct se_dev_entry *deve; | |
103 | ||
104 | if (!nacl) | |
105 | return; | |
106 | ||
107 | rcu_read_lock(); | |
108 | hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) | |
109 | core_scsi3_ua_allocate(deve, 0x29, | |
110 | ASCQ_29H_NEXUS_LOSS_OCCURRED); | |
111 | rcu_read_unlock(); | |
112 | } | |
113 | EXPORT_SYMBOL(core_allocate_nexus_loss_ua); | |
114 | ||
c66ac9db NB |
115 | /* core_tpg_add_node_to_devs(): |
116 | * | |
117 | * | |
118 | */ | |
119 | void core_tpg_add_node_to_devs( | |
120 | struct se_node_acl *acl, | |
df9766ca NB |
121 | struct se_portal_group *tpg, |
122 | struct se_lun *lun_orig) | |
c66ac9db | 123 | { |
c66ac9db NB |
124 | u32 lun_access = 0; |
125 | struct se_lun *lun; | |
126 | struct se_device *dev; | |
127 | ||
6bb82612 NB |
128 | mutex_lock(&tpg->tpg_lun_mutex); |
129 | hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) { | |
df9766ca | 130 | if (lun_orig && lun != lun_orig) |
c66ac9db NB |
131 | continue; |
132 | ||
4cc987ea NB |
133 | dev = rcu_dereference_check(lun->lun_se_dev, |
134 | lockdep_is_held(&tpg->tpg_lun_mutex)); | |
c66ac9db NB |
135 | /* |
136 | * By default in LIO-Target $FABRIC_MOD, | |
137 | * demo_mode_write_protect is ON, or READ_ONLY; | |
138 | */ | |
6708bb27 | 139 | if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) { |
58d92618 | 140 | lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; |
c66ac9db NB |
141 | } else { |
142 | /* | |
143 | * Allow only optical drives to issue R/W in default RO | |
144 | * demo mode. | |
145 | */ | |
e3d6f909 | 146 | if (dev->transport->get_device_type(dev) == TYPE_DISK) |
c66ac9db NB |
147 | lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; |
148 | else | |
149 | lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; | |
150 | } | |
151 | ||
f2d30680 | 152 | pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%llu] - Adding %s" |
c66ac9db | 153 | " access for LUN in Demo Mode\n", |
e3d6f909 AG |
154 | tpg->se_tpg_tfo->get_fabric_name(), |
155 | tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, | |
c66ac9db NB |
156 | (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ? |
157 | "READ-WRITE" : "READ-ONLY"); | |
158 | ||
e80ac6c4 | 159 | core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun, |
6bb82612 | 160 | lun_access, acl, tpg); |
e2480563 NB |
161 | /* |
162 | * Check to see if there are any existing persistent reservation | |
163 | * APTPL pre-registrations that need to be enabled for this dynamic | |
164 | * LUN ACL now.. | |
165 | */ | |
166 | core_scsi3_check_aptpl_registration(dev, tpg, lun, acl, | |
167 | lun->unpacked_lun); | |
c66ac9db | 168 | } |
6bb82612 | 169 | mutex_unlock(&tpg->tpg_lun_mutex); |
c66ac9db NB |
170 | } |
171 | ||
d36ad77f NB |
172 | static void |
173 | target_set_nacl_queue_depth(struct se_portal_group *tpg, | |
174 | struct se_node_acl *acl, u32 queue_depth) | |
c66ac9db | 175 | { |
d36ad77f NB |
176 | acl->queue_depth = queue_depth; |
177 | ||
c66ac9db | 178 | if (!acl->queue_depth) { |
d36ad77f | 179 | pr_warn("Queue depth for %s Initiator Node: %s is 0," |
e3d6f909 | 180 | "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(), |
c66ac9db NB |
181 | acl->initiatorname); |
182 | acl->queue_depth = 1; | |
183 | } | |
c66ac9db NB |
184 | } |
185 | ||
e413f472 CH |
186 | static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg, |
187 | const unsigned char *initiatorname) | |
4a5a75f3 | 188 | { |
c66ac9db | 189 | struct se_node_acl *acl; |
d36ad77f | 190 | u32 queue_depth; |
4a5a75f3 | 191 | |
144bc4c2 CH |
192 | acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size), |
193 | GFP_KERNEL); | |
6708bb27 | 194 | if (!acl) |
c66ac9db | 195 | return NULL; |
4a5a75f3 | 196 | |
c66ac9db NB |
197 | INIT_LIST_HEAD(&acl->acl_list); |
198 | INIT_LIST_HEAD(&acl->acl_sess_list); | |
29a05dee | 199 | INIT_HLIST_HEAD(&acl->lun_entry_hlist); |
afb999ff | 200 | kref_init(&acl->acl_kref); |
01468346 | 201 | init_completion(&acl->acl_free_comp); |
c66ac9db | 202 | spin_lock_init(&acl->nacl_sess_lock); |
29a05dee | 203 | mutex_init(&acl->lun_entry_mutex); |
c66ac9db | 204 | atomic_set(&acl->acl_pr_ref_count, 0); |
d36ad77f | 205 | |
e1750d20 | 206 | if (tpg->se_tpg_tfo->tpg_get_default_depth) |
d36ad77f | 207 | queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg); |
e1750d20 | 208 | else |
d36ad77f NB |
209 | queue_depth = 1; |
210 | target_set_nacl_queue_depth(tpg, acl, queue_depth); | |
211 | ||
c66ac9db NB |
212 | snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); |
213 | acl->se_tpg = tpg; | |
214 | acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); | |
4a5a75f3 | 215 | |
e3d6f909 | 216 | tpg->se_tpg_tfo->set_default_node_attributes(acl); |
c66ac9db | 217 | |
e413f472 | 218 | return acl; |
4a5a75f3 JE |
219 | } |
220 | ||
e413f472 | 221 | static void target_add_node_acl(struct se_node_acl *acl) |
c66ac9db | 222 | { |
e413f472 | 223 | struct se_portal_group *tpg = acl->se_tpg; |
c66ac9db | 224 | |
403edd78 | 225 | mutex_lock(&tpg->acl_node_mutex); |
e413f472 | 226 | list_add_tail(&acl->acl_list, &tpg->acl_node_list); |
403edd78 | 227 | mutex_unlock(&tpg->acl_node_mutex); |
e413f472 CH |
228 | |
229 | pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s" | |
230 | " Initiator Node: %s\n", | |
231 | tpg->se_tpg_tfo->get_fabric_name(), | |
232 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
233 | acl->dynamic_node_acl ? "DYNAMIC" : "", | |
234 | acl->queue_depth, | |
235 | tpg->se_tpg_tfo->get_fabric_name(), | |
236 | acl->initiatorname); | |
c66ac9db NB |
237 | } |
238 | ||
21aaa23b NB |
239 | bool target_tpg_has_node_acl(struct se_portal_group *tpg, |
240 | const char *initiatorname) | |
241 | { | |
242 | struct se_node_acl *acl; | |
243 | bool found = false; | |
244 | ||
245 | mutex_lock(&tpg->acl_node_mutex); | |
246 | list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { | |
247 | if (!strcmp(acl->initiatorname, initiatorname)) { | |
248 | found = true; | |
249 | break; | |
250 | } | |
251 | } | |
252 | mutex_unlock(&tpg->acl_node_mutex); | |
253 | ||
254 | return found; | |
255 | } | |
256 | EXPORT_SYMBOL(target_tpg_has_node_acl); | |
257 | ||
c66ac9db NB |
258 | struct se_node_acl *core_tpg_check_initiator_node_acl( |
259 | struct se_portal_group *tpg, | |
260 | unsigned char *initiatorname) | |
261 | { | |
262 | struct se_node_acl *acl; | |
263 | ||
264 | acl = core_tpg_get_initiator_node_acl(tpg, initiatorname); | |
6708bb27 | 265 | if (acl) |
c66ac9db NB |
266 | return acl; |
267 | ||
6708bb27 | 268 | if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) |
c66ac9db NB |
269 | return NULL; |
270 | ||
e413f472 | 271 | acl = target_alloc_node_acl(tpg, initiatorname); |
6708bb27 | 272 | if (!acl) |
c66ac9db | 273 | return NULL; |
21aaa23b NB |
274 | /* |
275 | * When allocating a dynamically generated node_acl, go ahead | |
276 | * and take the extra kref now before returning to the fabric | |
277 | * driver caller. | |
278 | * | |
279 | * Note this reference will be released at session shutdown | |
280 | * time within transport_free_session() code. | |
281 | */ | |
282 | kref_get(&acl->acl_kref); | |
c66ac9db NB |
283 | acl->dynamic_node_acl = 1; |
284 | ||
052605c6 NB |
285 | /* |
286 | * Here we only create demo-mode MappedLUNs from the active | |
35d1efe8 | 287 | * TPG LUNs if the fabric is not explicitly asking for |
052605c6 NB |
288 | * tpg_check_demo_mode_login_only() == 1. |
289 | */ | |
cdf88a2f AG |
290 | if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) || |
291 | (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1)) | |
df9766ca | 292 | core_tpg_add_node_to_devs(acl, tpg, NULL); |
c66ac9db | 293 | |
e413f472 | 294 | target_add_node_acl(acl); |
c66ac9db NB |
295 | return acl; |
296 | } | |
297 | EXPORT_SYMBOL(core_tpg_check_initiator_node_acl); | |
298 | ||
299 | void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl) | |
300 | { | |
301 | while (atomic_read(&nacl->acl_pr_ref_count) != 0) | |
302 | cpu_relax(); | |
303 | } | |
304 | ||
c66ac9db NB |
305 | struct se_node_acl *core_tpg_add_initiator_node_acl( |
306 | struct se_portal_group *tpg, | |
c7d6a803 | 307 | const char *initiatorname) |
c66ac9db | 308 | { |
c7d6a803 | 309 | struct se_node_acl *acl; |
c66ac9db | 310 | |
403edd78 | 311 | mutex_lock(&tpg->acl_node_mutex); |
c66ac9db | 312 | acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); |
6708bb27 | 313 | if (acl) { |
c66ac9db NB |
314 | if (acl->dynamic_node_acl) { |
315 | acl->dynamic_node_acl = 0; | |
6708bb27 | 316 | pr_debug("%s_TPG[%u] - Replacing dynamic ACL" |
e3d6f909 AG |
317 | " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
318 | tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname); | |
403edd78 | 319 | mutex_unlock(&tpg->acl_node_mutex); |
e413f472 | 320 | return acl; |
c66ac9db NB |
321 | } |
322 | ||
6708bb27 | 323 | pr_err("ACL entry for %s Initiator" |
c66ac9db | 324 | " Node %s already exists for TPG %u, ignoring" |
e3d6f909 AG |
325 | " request.\n", tpg->se_tpg_tfo->get_fabric_name(), |
326 | initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg)); | |
403edd78 | 327 | mutex_unlock(&tpg->acl_node_mutex); |
c66ac9db NB |
328 | return ERR_PTR(-EEXIST); |
329 | } | |
403edd78 | 330 | mutex_unlock(&tpg->acl_node_mutex); |
c66ac9db | 331 | |
e413f472 CH |
332 | acl = target_alloc_node_acl(tpg, initiatorname); |
333 | if (!acl) | |
c66ac9db | 334 | return ERR_PTR(-ENOMEM); |
c66ac9db | 335 | |
e413f472 | 336 | target_add_node_acl(acl); |
c66ac9db NB |
337 | return acl; |
338 | } | |
c66ac9db | 339 | |
c7d6a803 | 340 | void core_tpg_del_initiator_node_acl(struct se_node_acl *acl) |
c66ac9db | 341 | { |
c7d6a803 | 342 | struct se_portal_group *tpg = acl->se_tpg; |
337c0607 | 343 | LIST_HEAD(sess_list); |
c66ac9db | 344 | struct se_session *sess, *sess_tmp; |
140854cb | 345 | unsigned long flags; |
28168905 | 346 | int rc; |
c66ac9db | 347 | |
403edd78 | 348 | mutex_lock(&tpg->acl_node_mutex); |
c66ac9db NB |
349 | if (acl->dynamic_node_acl) { |
350 | acl->dynamic_node_acl = 0; | |
c66ac9db NB |
351 | } |
352 | list_del(&acl->acl_list); | |
403edd78 | 353 | mutex_unlock(&tpg->acl_node_mutex); |
c66ac9db | 354 | |
337c0607 NB |
355 | spin_lock_irqsave(&acl->nacl_sess_lock, flags); |
356 | acl->acl_stop = 1; | |
357 | ||
358 | list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list, | |
359 | sess_acl_list) { | |
360 | if (sess->sess_tearing_down != 0) | |
c66ac9db NB |
361 | continue; |
362 | ||
d36ad77f NB |
363 | if (!target_get_session(sess)) |
364 | continue; | |
337c0607 NB |
365 | list_move(&sess->sess_acl_list, &sess_list); |
366 | } | |
367 | spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); | |
368 | ||
369 | list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) { | |
370 | list_del(&sess->sess_acl_list); | |
c66ac9db | 371 | |
337c0607 NB |
372 | rc = tpg->se_tpg_tfo->shutdown_session(sess); |
373 | target_put_session(sess); | |
374 | if (!rc) | |
375 | continue; | |
376 | target_put_session(sess); | |
c66ac9db | 377 | } |
337c0607 NB |
378 | target_put_nacl(acl); |
379 | /* | |
380 | * Wait for last target_put_nacl() to complete in target_complete_nacl() | |
381 | * for active fabric session transport_deregister_session() callbacks. | |
382 | */ | |
383 | wait_for_completion(&acl->acl_free_comp); | |
c66ac9db NB |
384 | |
385 | core_tpg_wait_for_nacl_pr_ref(acl); | |
c66ac9db NB |
386 | core_free_device_list_for_node(acl, tpg); |
387 | ||
6708bb27 | 388 | pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s" |
e3d6f909 AG |
389 | " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
390 | tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth, | |
391 | tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname); | |
c66ac9db | 392 | |
144bc4c2 | 393 | kfree(acl); |
c66ac9db | 394 | } |
c66ac9db NB |
395 | |
396 | /* core_tpg_set_initiator_node_queue_depth(): | |
397 | * | |
398 | * | |
399 | */ | |
400 | int core_tpg_set_initiator_node_queue_depth( | |
d36ad77f NB |
401 | struct se_node_acl *acl, |
402 | u32 queue_depth) | |
c66ac9db | 403 | { |
d36ad77f NB |
404 | LIST_HEAD(sess_list); |
405 | struct se_portal_group *tpg = acl->se_tpg; | |
406 | struct se_session *sess, *sess_tmp; | |
140854cb | 407 | unsigned long flags; |
d36ad77f | 408 | int rc; |
c66ac9db NB |
409 | |
410 | /* | |
411 | * User has requested to change the queue depth for a Initiator Node. | |
412 | * Change the value in the Node's struct se_node_acl, and call | |
d36ad77f | 413 | * target_set_nacl_queue_depth() to set the new queue depth. |
c66ac9db | 414 | */ |
d36ad77f NB |
415 | target_set_nacl_queue_depth(tpg, acl, queue_depth); |
416 | ||
417 | spin_lock_irqsave(&acl->nacl_sess_lock, flags); | |
418 | list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list, | |
419 | sess_acl_list) { | |
420 | if (sess->sess_tearing_down != 0) | |
421 | continue; | |
422 | if (!target_get_session(sess)) | |
423 | continue; | |
424 | spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); | |
c66ac9db | 425 | |
c66ac9db | 426 | /* |
d36ad77f NB |
427 | * Finally call tpg->se_tpg_tfo->close_session() to force session |
428 | * reinstatement to occur if there is an active session for the | |
429 | * $FABRIC_MOD Initiator Node in question. | |
c66ac9db | 430 | */ |
d36ad77f NB |
431 | rc = tpg->se_tpg_tfo->shutdown_session(sess); |
432 | target_put_session(sess); | |
433 | if (!rc) { | |
434 | spin_lock_irqsave(&acl->nacl_sess_lock, flags); | |
435 | continue; | |
436 | } | |
437 | target_put_session(sess); | |
438 | spin_lock_irqsave(&acl->nacl_sess_lock, flags); | |
c66ac9db | 439 | } |
d36ad77f | 440 | spin_unlock_irqrestore(&acl->nacl_sess_lock, flags); |
c66ac9db | 441 | |
bfb9035c | 442 | pr_debug("Successfully changed queue depth to: %d for Initiator" |
d36ad77f NB |
443 | " Node: %s on %s Target Portal Group: %u\n", acl->queue_depth, |
444 | acl->initiatorname, tpg->se_tpg_tfo->get_fabric_name(), | |
e3d6f909 | 445 | tpg->se_tpg_tfo->tpg_get_tag(tpg)); |
c66ac9db | 446 | |
c66ac9db NB |
447 | return 0; |
448 | } | |
449 | EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth); | |
450 | ||
79e62fc3 AG |
451 | /* core_tpg_set_initiator_node_tag(): |
452 | * | |
453 | * Initiator nodeacl tags are not used internally, but may be used by | |
454 | * userspace to emulate aliases or groups. | |
455 | * Returns length of newly-set tag or -EINVAL. | |
456 | */ | |
457 | int core_tpg_set_initiator_node_tag( | |
458 | struct se_portal_group *tpg, | |
459 | struct se_node_acl *acl, | |
460 | const char *new_tag) | |
461 | { | |
462 | if (strlen(new_tag) >= MAX_ACL_TAG_SIZE) | |
463 | return -EINVAL; | |
464 | ||
465 | if (!strncmp("NULL", new_tag, 4)) { | |
466 | acl->acl_tag[0] = '\0'; | |
467 | return 0; | |
468 | } | |
469 | ||
470 | return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag); | |
471 | } | |
472 | EXPORT_SYMBOL(core_tpg_set_initiator_node_tag); | |
473 | ||
5277797d NB |
474 | static void core_tpg_lun_ref_release(struct percpu_ref *ref) |
475 | { | |
476 | struct se_lun *lun = container_of(ref, struct se_lun, lun_ref); | |
477 | ||
478 | complete(&lun->lun_ref_comp); | |
479 | } | |
480 | ||
c66ac9db | 481 | int core_tpg_register( |
c66ac9db NB |
482 | struct se_wwn *se_wwn, |
483 | struct se_portal_group *se_tpg, | |
e4aae5af | 484 | int proto_id) |
c66ac9db | 485 | { |
adf653f9 CH |
486 | int ret; |
487 | ||
bc0c94b1 NB |
488 | if (!se_tpg) |
489 | return -EINVAL; | |
490 | /* | |
491 | * For the typical case where core_tpg_register() is called by a | |
492 | * fabric driver from target_core_fabric_ops->fabric_make_tpg() | |
493 | * configfs context, use the original tf_ops pointer already saved | |
494 | * by target-core in target_fabric_make_wwn(). | |
495 | * | |
496 | * Otherwise, for special cases like iscsi-target discovery TPGs | |
497 | * the caller is responsible for setting ->se_tpg_tfo ahead of | |
498 | * calling core_tpg_register(). | |
499 | */ | |
500 | if (se_wwn) | |
501 | se_tpg->se_tpg_tfo = se_wwn->wwn_tf->tf_ops; | |
c66ac9db | 502 | |
bc0c94b1 NB |
503 | if (!se_tpg->se_tpg_tfo) { |
504 | pr_err("Unable to locate se_tpg->se_tpg_tfo pointer\n"); | |
505 | return -EINVAL; | |
c66ac9db NB |
506 | } |
507 | ||
6bb82612 | 508 | INIT_HLIST_HEAD(&se_tpg->tpg_lun_hlist); |
e4aae5af | 509 | se_tpg->proto_id = proto_id; |
c66ac9db NB |
510 | se_tpg->se_tpg_wwn = se_wwn; |
511 | atomic_set(&se_tpg->tpg_pr_ref_count, 0); | |
512 | INIT_LIST_HEAD(&se_tpg->acl_node_list); | |
e3d6f909 | 513 | INIT_LIST_HEAD(&se_tpg->se_tpg_node); |
c66ac9db | 514 | INIT_LIST_HEAD(&se_tpg->tpg_sess_list); |
c66ac9db | 515 | spin_lock_init(&se_tpg->session_lock); |
6bb82612 | 516 | mutex_init(&se_tpg->tpg_lun_mutex); |
403edd78 | 517 | mutex_init(&se_tpg->acl_node_mutex); |
c66ac9db | 518 | |
e4aae5af | 519 | if (se_tpg->proto_id >= 0) { |
adf653f9 CH |
520 | se_tpg->tpg_virt_lun0 = core_tpg_alloc_lun(se_tpg, 0); |
521 | if (IS_ERR(se_tpg->tpg_virt_lun0)) | |
522 | return PTR_ERR(se_tpg->tpg_virt_lun0); | |
523 | ||
524 | ret = core_tpg_add_lun(se_tpg, se_tpg->tpg_virt_lun0, | |
525 | TRANSPORT_LUNFLAGS_READ_ONLY, g_lun0_dev); | |
526 | if (ret < 0) { | |
527 | kfree(se_tpg->tpg_virt_lun0); | |
528 | return ret; | |
c66ac9db NB |
529 | } |
530 | } | |
531 | ||
e3d6f909 AG |
532 | spin_lock_bh(&tpg_lock); |
533 | list_add_tail(&se_tpg->se_tpg_node, &tpg_list); | |
534 | spin_unlock_bh(&tpg_lock); | |
c66ac9db | 535 | |
e4aae5af | 536 | pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, " |
bc0c94b1 NB |
537 | "Proto: %d, Portal Tag: %u\n", se_tpg->se_tpg_tfo->get_fabric_name(), |
538 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) ? | |
539 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) : NULL, | |
540 | se_tpg->proto_id, se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); | |
c66ac9db NB |
541 | |
542 | return 0; | |
543 | } | |
544 | EXPORT_SYMBOL(core_tpg_register); | |
545 | ||
546 | int core_tpg_deregister(struct se_portal_group *se_tpg) | |
547 | { | |
e4aae5af | 548 | const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; |
e89d15ee | 549 | struct se_node_acl *nacl, *nacl_tmp; |
22793de5 | 550 | LIST_HEAD(node_list); |
e89d15ee | 551 | |
e4aae5af CH |
552 | pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, " |
553 | "Proto: %d, Portal Tag: %u\n", tfo->get_fabric_name(), | |
554 | tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL, | |
555 | se_tpg->proto_id, tfo->tpg_get_tag(se_tpg)); | |
c66ac9db | 556 | |
e3d6f909 AG |
557 | spin_lock_bh(&tpg_lock); |
558 | list_del(&se_tpg->se_tpg_node); | |
559 | spin_unlock_bh(&tpg_lock); | |
c66ac9db NB |
560 | |
561 | while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0) | |
562 | cpu_relax(); | |
403edd78 | 563 | |
22793de5 NB |
564 | mutex_lock(&se_tpg->acl_node_mutex); |
565 | list_splice_init(&se_tpg->acl_node_list, &node_list); | |
566 | mutex_unlock(&se_tpg->acl_node_mutex); | |
e89d15ee NB |
567 | /* |
568 | * Release any remaining demo-mode generated se_node_acl that have | |
569 | * not been released because of TFO->tpg_check_demo_mode_cache() == 1 | |
570 | * in transport_deregister_session(). | |
571 | */ | |
22793de5 | 572 | list_for_each_entry_safe(nacl, nacl_tmp, &node_list, acl_list) { |
e89d15ee | 573 | list_del(&nacl->acl_list); |
e89d15ee NB |
574 | |
575 | core_tpg_wait_for_nacl_pr_ref(nacl); | |
576 | core_free_device_list_for_node(nacl, se_tpg); | |
144bc4c2 | 577 | kfree(nacl); |
e89d15ee | 578 | } |
c66ac9db | 579 | |
adf653f9 CH |
580 | if (se_tpg->proto_id >= 0) { |
581 | core_tpg_remove_lun(se_tpg, se_tpg->tpg_virt_lun0); | |
582 | kfree_rcu(se_tpg->tpg_virt_lun0, rcu_head); | |
583 | } | |
c66ac9db | 584 | |
c66ac9db NB |
585 | return 0; |
586 | } | |
587 | EXPORT_SYMBOL(core_tpg_deregister); | |
588 | ||
d344f8a1 | 589 | struct se_lun *core_tpg_alloc_lun( |
c66ac9db | 590 | struct se_portal_group *tpg, |
f2d30680 | 591 | u64 unpacked_lun) |
c66ac9db NB |
592 | { |
593 | struct se_lun *lun; | |
594 | ||
6bb82612 NB |
595 | lun = kzalloc(sizeof(*lun), GFP_KERNEL); |
596 | if (!lun) { | |
597 | pr_err("Unable to allocate se_lun memory\n"); | |
598 | return ERR_PTR(-ENOMEM); | |
c66ac9db | 599 | } |
6bb82612 NB |
600 | lun->unpacked_lun = unpacked_lun; |
601 | lun->lun_link_magic = SE_LUN_LINK_MAGIC; | |
6bb82612 | 602 | atomic_set(&lun->lun_acl_count, 0); |
6bb82612 | 603 | init_completion(&lun->lun_ref_comp); |
adf653f9 CH |
604 | INIT_LIST_HEAD(&lun->lun_deve_list); |
605 | INIT_LIST_HEAD(&lun->lun_dev_link); | |
606 | atomic_set(&lun->lun_tg_pt_secondary_offline, 0); | |
607 | spin_lock_init(&lun->lun_deve_lock); | |
608 | mutex_init(&lun->lun_tg_pt_md_mutex); | |
609 | INIT_LIST_HEAD(&lun->lun_tg_pt_gp_link); | |
610 | spin_lock_init(&lun->lun_tg_pt_gp_lock); | |
adf653f9 | 611 | lun->lun_tpg = tpg; |
c66ac9db NB |
612 | |
613 | return lun; | |
614 | } | |
615 | ||
d344f8a1 | 616 | int core_tpg_add_lun( |
c66ac9db NB |
617 | struct se_portal_group *tpg, |
618 | struct se_lun *lun, | |
619 | u32 lun_access, | |
340dbf72 | 620 | struct se_device *dev) |
c66ac9db | 621 | { |
e3d6f909 AG |
622 | int ret; |
623 | ||
2aad2a86 | 624 | ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0, |
a34375ef | 625 | GFP_KERNEL); |
e3d6f909 | 626 | if (ret < 0) |
adf653f9 | 627 | goto out; |
c66ac9db | 628 | |
adf653f9 CH |
629 | ret = core_alloc_rtpi(lun, dev); |
630 | if (ret) | |
631 | goto out_kill_ref; | |
632 | ||
633 | if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) && | |
634 | !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) | |
635 | target_attach_tg_pt_gp(lun, dev->t10_alua.default_tg_pt_gp); | |
5277797d | 636 | |
6bb82612 | 637 | mutex_lock(&tpg->tpg_lun_mutex); |
adf653f9 | 638 | |
adf653f9 | 639 | spin_lock(&dev->se_port_lock); |
4cc987ea | 640 | lun->lun_index = dev->dev_index; |
adf653f9 CH |
641 | rcu_assign_pointer(lun->lun_se_dev, dev); |
642 | dev->export_count++; | |
643 | list_add_tail(&lun->lun_dev_link, &dev->dev_sep_list); | |
644 | spin_unlock(&dev->se_port_lock); | |
5277797d | 645 | |
eeeb9522 NB |
646 | if (dev->dev_flags & DF_READ_ONLY) |
647 | lun->lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; | |
648 | else | |
649 | lun->lun_access = lun_access; | |
6bb82612 NB |
650 | if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) |
651 | hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist); | |
652 | mutex_unlock(&tpg->tpg_lun_mutex); | |
c66ac9db NB |
653 | |
654 | return 0; | |
adf653f9 CH |
655 | |
656 | out_kill_ref: | |
657 | percpu_ref_exit(&lun->lun_ref); | |
658 | out: | |
659 | return ret; | |
c66ac9db NB |
660 | } |
661 | ||
cd9d7cba | 662 | void core_tpg_remove_lun( |
c66ac9db NB |
663 | struct se_portal_group *tpg, |
664 | struct se_lun *lun) | |
665 | { | |
4cc987ea NB |
666 | /* |
667 | * rcu_dereference_raw protected by se_lun->lun_group symlink | |
668 | * reference to se_device->dev_group. | |
669 | */ | |
670 | struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); | |
6bb82612 | 671 | |
4a9a6c8d | 672 | core_clear_lun_from_tpg(lun, tpg); |
9e37d042 NB |
673 | /* |
674 | * Wait for any active I/O references to percpu se_lun->lun_ref to | |
675 | * be released. Also, se_lun->lun_ref is now used by PR and ALUA | |
676 | * logic when referencing a remote target port during ALL_TGT_PT=1 | |
677 | * and generating UNIT_ATTENTIONs for ALUA access state transition. | |
678 | */ | |
4a9a6c8d | 679 | transport_clear_lun_ref(lun); |
c66ac9db | 680 | |
6bb82612 | 681 | mutex_lock(&tpg->tpg_lun_mutex); |
adf653f9 | 682 | if (lun->lun_se_dev) { |
adf653f9 | 683 | target_detach_tg_pt_gp(lun); |
c66ac9db | 684 | |
adf653f9 CH |
685 | spin_lock(&dev->se_port_lock); |
686 | list_del(&lun->lun_dev_link); | |
687 | dev->export_count--; | |
688 | rcu_assign_pointer(lun->lun_se_dev, NULL); | |
689 | spin_unlock(&dev->se_port_lock); | |
690 | } | |
6bb82612 NB |
691 | if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) |
692 | hlist_del_rcu(&lun->link); | |
693 | mutex_unlock(&tpg->tpg_lun_mutex); | |
c66ac9db | 694 | |
9a1049da | 695 | percpu_ref_exit(&lun->lun_ref); |
c66ac9db | 696 | } |