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[deliverable/linux.git] / drivers / target / target_core_tpg.c
1 /*******************************************************************************
2 * Filename: target_core_tpg.c
3 *
4 * This file contains generic Target Portal Group related functions.
5 *
6 * (c) Copyright 2002-2013 Datera, Inc.
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>
31 #include <linux/in.h>
32 #include <linux/export.h>
33 #include <net/sock.h>
34 #include <net/tcp.h>
35 #include <scsi/scsi.h>
36 #include <scsi/scsi_cmnd.h>
37
38 #include <target/target_core_base.h>
39 #include <target/target_core_backend.h>
40 #include <target/target_core_fabric.h>
41
42 #include "target_core_internal.h"
43 #include "target_core_pr.h"
44
45 extern struct se_device *g_lun0_dev;
46
47 static DEFINE_SPINLOCK(tpg_lock);
48 static LIST_HEAD(tpg_list);
49
50 /* core_clear_initiator_node_from_tpg():
51 *
52 *
53 */
54 static void core_clear_initiator_node_from_tpg(
55 struct se_node_acl *nacl,
56 struct se_portal_group *tpg)
57 {
58 int i;
59 struct se_dev_entry *deve;
60 struct se_lun *lun;
61
62 spin_lock_irq(&nacl->device_list_lock);
63 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
64 deve = nacl->device_list[i];
65
66 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
67 continue;
68
69 if (!deve->se_lun) {
70 pr_err("%s device entries device pointer is"
71 " NULL, but Initiator has access.\n",
72 tpg->se_tpg_tfo->get_fabric_name());
73 continue;
74 }
75
76 lun = deve->se_lun;
77 spin_unlock_irq(&nacl->device_list_lock);
78 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
79 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
80
81 spin_lock_irq(&nacl->device_list_lock);
82 }
83 spin_unlock_irq(&nacl->device_list_lock);
84 }
85
86 /* __core_tpg_get_initiator_node_acl():
87 *
88 * spin_lock_bh(&tpg->acl_node_lock); must be held when calling
89 */
90 struct se_node_acl *__core_tpg_get_initiator_node_acl(
91 struct se_portal_group *tpg,
92 const char *initiatorname)
93 {
94 struct se_node_acl *acl;
95
96 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
97 if (!strcmp(acl->initiatorname, initiatorname))
98 return acl;
99 }
100
101 return NULL;
102 }
103
104 /* core_tpg_get_initiator_node_acl():
105 *
106 *
107 */
108 struct se_node_acl *core_tpg_get_initiator_node_acl(
109 struct se_portal_group *tpg,
110 unsigned char *initiatorname)
111 {
112 struct se_node_acl *acl;
113
114 spin_lock_irq(&tpg->acl_node_lock);
115 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
116 spin_unlock_irq(&tpg->acl_node_lock);
117
118 return acl;
119 }
120 EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
121
122 /* core_tpg_add_node_to_devs():
123 *
124 *
125 */
126 void core_tpg_add_node_to_devs(
127 struct se_node_acl *acl,
128 struct se_portal_group *tpg)
129 {
130 int i = 0;
131 u32 lun_access = 0;
132 struct se_lun *lun;
133 struct se_device *dev;
134
135 spin_lock(&tpg->tpg_lun_lock);
136 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
137 lun = tpg->tpg_lun_list[i];
138 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
139 continue;
140
141 spin_unlock(&tpg->tpg_lun_lock);
142
143 dev = lun->lun_se_dev;
144 /*
145 * By default in LIO-Target $FABRIC_MOD,
146 * demo_mode_write_protect is ON, or READ_ONLY;
147 */
148 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
149 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
150 } else {
151 /*
152 * Allow only optical drives to issue R/W in default RO
153 * demo mode.
154 */
155 if (dev->transport->get_device_type(dev) == TYPE_DISK)
156 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
157 else
158 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
159 }
160
161 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
162 " access for LUN in Demo Mode\n",
163 tpg->se_tpg_tfo->get_fabric_name(),
164 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
165 (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
166 "READ-WRITE" : "READ-ONLY");
167
168 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
169 lun_access, acl, tpg);
170 /*
171 * Check to see if there are any existing persistent reservation
172 * APTPL pre-registrations that need to be enabled for this dynamic
173 * LUN ACL now..
174 */
175 core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
176 lun->unpacked_lun);
177 spin_lock(&tpg->tpg_lun_lock);
178 }
179 spin_unlock(&tpg->tpg_lun_lock);
180 }
181
182 /* core_set_queue_depth_for_node():
183 *
184 *
185 */
186 static int core_set_queue_depth_for_node(
187 struct se_portal_group *tpg,
188 struct se_node_acl *acl)
189 {
190 if (!acl->queue_depth) {
191 pr_err("Queue depth for %s Initiator Node: %s is 0,"
192 "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
193 acl->initiatorname);
194 acl->queue_depth = 1;
195 }
196
197 return 0;
198 }
199
200 void array_free(void *array, int n)
201 {
202 void **a = array;
203 int i;
204
205 for (i = 0; i < n; i++)
206 kfree(a[i]);
207 kfree(a);
208 }
209
210 static void *array_zalloc(int n, size_t size, gfp_t flags)
211 {
212 void **a;
213 int i;
214
215 a = kzalloc(n * sizeof(void*), flags);
216 if (!a)
217 return NULL;
218 for (i = 0; i < n; i++) {
219 a[i] = kzalloc(size, flags);
220 if (!a[i]) {
221 array_free(a, n);
222 return NULL;
223 }
224 }
225 return a;
226 }
227
228 /* core_create_device_list_for_node():
229 *
230 *
231 */
232 static int core_create_device_list_for_node(struct se_node_acl *nacl)
233 {
234 struct se_dev_entry *deve;
235 int i;
236
237 nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
238 sizeof(struct se_dev_entry), GFP_KERNEL);
239 if (!nacl->device_list) {
240 pr_err("Unable to allocate memory for"
241 " struct se_node_acl->device_list\n");
242 return -ENOMEM;
243 }
244 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
245 deve = nacl->device_list[i];
246
247 atomic_set(&deve->ua_count, 0);
248 atomic_set(&deve->pr_ref_count, 0);
249 spin_lock_init(&deve->ua_lock);
250 INIT_LIST_HEAD(&deve->alua_port_list);
251 INIT_LIST_HEAD(&deve->ua_list);
252 }
253
254 return 0;
255 }
256
257 static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg,
258 const unsigned char *initiatorname)
259 {
260 struct se_node_acl *acl;
261
262 acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size),
263 GFP_KERNEL);
264 if (!acl)
265 return NULL;
266
267 INIT_LIST_HEAD(&acl->acl_list);
268 INIT_LIST_HEAD(&acl->acl_sess_list);
269 kref_init(&acl->acl_kref);
270 init_completion(&acl->acl_free_comp);
271 spin_lock_init(&acl->device_list_lock);
272 spin_lock_init(&acl->nacl_sess_lock);
273 atomic_set(&acl->acl_pr_ref_count, 0);
274 if (tpg->se_tpg_tfo->tpg_get_default_depth)
275 acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
276 else
277 acl->queue_depth = 1;
278 snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
279 acl->se_tpg = tpg;
280 acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
281
282 tpg->se_tpg_tfo->set_default_node_attributes(acl);
283
284 if (core_create_device_list_for_node(acl) < 0)
285 goto out_free_acl;
286 if (core_set_queue_depth_for_node(tpg, acl) < 0)
287 goto out_free_device_list;
288
289 return acl;
290
291 out_free_device_list:
292 core_free_device_list_for_node(acl, tpg);
293 out_free_acl:
294 kfree(acl);
295 return NULL;
296 }
297
298 static void target_add_node_acl(struct se_node_acl *acl)
299 {
300 struct se_portal_group *tpg = acl->se_tpg;
301
302 spin_lock_irq(&tpg->acl_node_lock);
303 list_add_tail(&acl->acl_list, &tpg->acl_node_list);
304 tpg->num_node_acls++;
305 spin_unlock_irq(&tpg->acl_node_lock);
306
307 pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s"
308 " Initiator Node: %s\n",
309 tpg->se_tpg_tfo->get_fabric_name(),
310 tpg->se_tpg_tfo->tpg_get_tag(tpg),
311 acl->dynamic_node_acl ? "DYNAMIC" : "",
312 acl->queue_depth,
313 tpg->se_tpg_tfo->get_fabric_name(),
314 acl->initiatorname);
315 }
316
317 struct se_node_acl *core_tpg_check_initiator_node_acl(
318 struct se_portal_group *tpg,
319 unsigned char *initiatorname)
320 {
321 struct se_node_acl *acl;
322
323 acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
324 if (acl)
325 return acl;
326
327 if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
328 return NULL;
329
330 acl = target_alloc_node_acl(tpg, initiatorname);
331 if (!acl)
332 return NULL;
333 acl->dynamic_node_acl = 1;
334
335 /*
336 * Here we only create demo-mode MappedLUNs from the active
337 * TPG LUNs if the fabric is not explicitly asking for
338 * tpg_check_demo_mode_login_only() == 1.
339 */
340 if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
341 (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
342 core_tpg_add_node_to_devs(acl, tpg);
343
344 target_add_node_acl(acl);
345 return acl;
346 }
347 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
348
349 void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
350 {
351 while (atomic_read(&nacl->acl_pr_ref_count) != 0)
352 cpu_relax();
353 }
354
355 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
356 {
357 int i;
358 struct se_lun *lun;
359
360 spin_lock(&tpg->tpg_lun_lock);
361 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
362 lun = tpg->tpg_lun_list[i];
363
364 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
365 (lun->lun_se_dev == NULL))
366 continue;
367
368 spin_unlock(&tpg->tpg_lun_lock);
369 core_dev_del_lun(tpg, lun);
370 spin_lock(&tpg->tpg_lun_lock);
371 }
372 spin_unlock(&tpg->tpg_lun_lock);
373 }
374 EXPORT_SYMBOL(core_tpg_clear_object_luns);
375
376 struct se_node_acl *core_tpg_add_initiator_node_acl(
377 struct se_portal_group *tpg,
378 const char *initiatorname)
379 {
380 struct se_node_acl *acl;
381
382 spin_lock_irq(&tpg->acl_node_lock);
383 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
384 if (acl) {
385 if (acl->dynamic_node_acl) {
386 acl->dynamic_node_acl = 0;
387 pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
388 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
389 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
390 spin_unlock_irq(&tpg->acl_node_lock);
391 return acl;
392 }
393
394 pr_err("ACL entry for %s Initiator"
395 " Node %s already exists for TPG %u, ignoring"
396 " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
397 initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
398 spin_unlock_irq(&tpg->acl_node_lock);
399 return ERR_PTR(-EEXIST);
400 }
401 spin_unlock_irq(&tpg->acl_node_lock);
402
403 acl = target_alloc_node_acl(tpg, initiatorname);
404 if (!acl)
405 return ERR_PTR(-ENOMEM);
406
407 target_add_node_acl(acl);
408 return acl;
409 }
410
411 void core_tpg_del_initiator_node_acl(struct se_node_acl *acl)
412 {
413 struct se_portal_group *tpg = acl->se_tpg;
414 LIST_HEAD(sess_list);
415 struct se_session *sess, *sess_tmp;
416 unsigned long flags;
417 int rc;
418
419 spin_lock_irq(&tpg->acl_node_lock);
420 if (acl->dynamic_node_acl) {
421 acl->dynamic_node_acl = 0;
422 }
423 list_del(&acl->acl_list);
424 tpg->num_node_acls--;
425 spin_unlock_irq(&tpg->acl_node_lock);
426
427 spin_lock_irqsave(&acl->nacl_sess_lock, flags);
428 acl->acl_stop = 1;
429
430 list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
431 sess_acl_list) {
432 if (sess->sess_tearing_down != 0)
433 continue;
434
435 target_get_session(sess);
436 list_move(&sess->sess_acl_list, &sess_list);
437 }
438 spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
439
440 list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
441 list_del(&sess->sess_acl_list);
442
443 rc = tpg->se_tpg_tfo->shutdown_session(sess);
444 target_put_session(sess);
445 if (!rc)
446 continue;
447 target_put_session(sess);
448 }
449 target_put_nacl(acl);
450 /*
451 * Wait for last target_put_nacl() to complete in target_complete_nacl()
452 * for active fabric session transport_deregister_session() callbacks.
453 */
454 wait_for_completion(&acl->acl_free_comp);
455
456 core_tpg_wait_for_nacl_pr_ref(acl);
457 core_clear_initiator_node_from_tpg(acl, tpg);
458 core_free_device_list_for_node(acl, tpg);
459
460 pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
461 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
462 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
463 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
464
465 kfree(acl);
466 }
467
468 /* core_tpg_set_initiator_node_queue_depth():
469 *
470 *
471 */
472 int core_tpg_set_initiator_node_queue_depth(
473 struct se_portal_group *tpg,
474 unsigned char *initiatorname,
475 u32 queue_depth,
476 int force)
477 {
478 struct se_session *sess, *init_sess = NULL;
479 struct se_node_acl *acl;
480 unsigned long flags;
481 int dynamic_acl = 0;
482
483 spin_lock_irq(&tpg->acl_node_lock);
484 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
485 if (!acl) {
486 pr_err("Access Control List entry for %s Initiator"
487 " Node %s does not exists for TPG %hu, ignoring"
488 " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
489 initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
490 spin_unlock_irq(&tpg->acl_node_lock);
491 return -ENODEV;
492 }
493 if (acl->dynamic_node_acl) {
494 acl->dynamic_node_acl = 0;
495 dynamic_acl = 1;
496 }
497 spin_unlock_irq(&tpg->acl_node_lock);
498
499 spin_lock_irqsave(&tpg->session_lock, flags);
500 list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
501 if (sess->se_node_acl != acl)
502 continue;
503
504 if (!force) {
505 pr_err("Unable to change queue depth for %s"
506 " Initiator Node: %s while session is"
507 " operational. To forcefully change the queue"
508 " depth and force session reinstatement"
509 " use the \"force=1\" parameter.\n",
510 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
511 spin_unlock_irqrestore(&tpg->session_lock, flags);
512
513 spin_lock_irq(&tpg->acl_node_lock);
514 if (dynamic_acl)
515 acl->dynamic_node_acl = 1;
516 spin_unlock_irq(&tpg->acl_node_lock);
517 return -EEXIST;
518 }
519 /*
520 * Determine if the session needs to be closed by our context.
521 */
522 if (!tpg->se_tpg_tfo->shutdown_session(sess))
523 continue;
524
525 init_sess = sess;
526 break;
527 }
528
529 /*
530 * User has requested to change the queue depth for a Initiator Node.
531 * Change the value in the Node's struct se_node_acl, and call
532 * core_set_queue_depth_for_node() to add the requested queue depth.
533 *
534 * Finally call tpg->se_tpg_tfo->close_session() to force session
535 * reinstatement to occur if there is an active session for the
536 * $FABRIC_MOD Initiator Node in question.
537 */
538 acl->queue_depth = queue_depth;
539
540 if (core_set_queue_depth_for_node(tpg, acl) < 0) {
541 spin_unlock_irqrestore(&tpg->session_lock, flags);
542 /*
543 * Force session reinstatement if
544 * core_set_queue_depth_for_node() failed, because we assume
545 * the $FABRIC_MOD has already the set session reinstatement
546 * bit from tpg->se_tpg_tfo->shutdown_session() called above.
547 */
548 if (init_sess)
549 tpg->se_tpg_tfo->close_session(init_sess);
550
551 spin_lock_irq(&tpg->acl_node_lock);
552 if (dynamic_acl)
553 acl->dynamic_node_acl = 1;
554 spin_unlock_irq(&tpg->acl_node_lock);
555 return -EINVAL;
556 }
557 spin_unlock_irqrestore(&tpg->session_lock, flags);
558 /*
559 * If the $FABRIC_MOD session for the Initiator Node ACL exists,
560 * forcefully shutdown the $FABRIC_MOD session/nexus.
561 */
562 if (init_sess)
563 tpg->se_tpg_tfo->close_session(init_sess);
564
565 pr_debug("Successfully changed queue depth to: %d for Initiator"
566 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
567 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
568 tpg->se_tpg_tfo->tpg_get_tag(tpg));
569
570 spin_lock_irq(&tpg->acl_node_lock);
571 if (dynamic_acl)
572 acl->dynamic_node_acl = 1;
573 spin_unlock_irq(&tpg->acl_node_lock);
574
575 return 0;
576 }
577 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
578
579 /* core_tpg_set_initiator_node_tag():
580 *
581 * Initiator nodeacl tags are not used internally, but may be used by
582 * userspace to emulate aliases or groups.
583 * Returns length of newly-set tag or -EINVAL.
584 */
585 int core_tpg_set_initiator_node_tag(
586 struct se_portal_group *tpg,
587 struct se_node_acl *acl,
588 const char *new_tag)
589 {
590 if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
591 return -EINVAL;
592
593 if (!strncmp("NULL", new_tag, 4)) {
594 acl->acl_tag[0] = '\0';
595 return 0;
596 }
597
598 return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
599 }
600 EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
601
602 static void core_tpg_lun_ref_release(struct percpu_ref *ref)
603 {
604 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
605
606 complete(&lun->lun_ref_comp);
607 }
608
609 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
610 {
611 /* Set in core_dev_setup_virtual_lun0() */
612 struct se_device *dev = g_lun0_dev;
613 struct se_lun *lun = &se_tpg->tpg_virt_lun0;
614 u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
615 int ret;
616
617 lun->unpacked_lun = 0;
618 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
619 atomic_set(&lun->lun_acl_count, 0);
620 init_completion(&lun->lun_shutdown_comp);
621 INIT_LIST_HEAD(&lun->lun_acl_list);
622 spin_lock_init(&lun->lun_acl_lock);
623 spin_lock_init(&lun->lun_sep_lock);
624 init_completion(&lun->lun_ref_comp);
625
626 ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev);
627 if (ret < 0)
628 return ret;
629
630 return 0;
631 }
632
633 int core_tpg_register(
634 const struct target_core_fabric_ops *tfo,
635 struct se_wwn *se_wwn,
636 struct se_portal_group *se_tpg,
637 int proto_id)
638 {
639 struct se_lun *lun;
640 u32 i;
641
642 se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
643 sizeof(struct se_lun), GFP_KERNEL);
644 if (!se_tpg->tpg_lun_list) {
645 pr_err("Unable to allocate struct se_portal_group->"
646 "tpg_lun_list\n");
647 return -ENOMEM;
648 }
649
650 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
651 lun = se_tpg->tpg_lun_list[i];
652 lun->unpacked_lun = i;
653 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
654 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
655 atomic_set(&lun->lun_acl_count, 0);
656 init_completion(&lun->lun_shutdown_comp);
657 INIT_LIST_HEAD(&lun->lun_acl_list);
658 spin_lock_init(&lun->lun_acl_lock);
659 spin_lock_init(&lun->lun_sep_lock);
660 init_completion(&lun->lun_ref_comp);
661 }
662
663 se_tpg->proto_id = proto_id;
664 se_tpg->se_tpg_tfo = tfo;
665 se_tpg->se_tpg_wwn = se_wwn;
666 atomic_set(&se_tpg->tpg_pr_ref_count, 0);
667 INIT_LIST_HEAD(&se_tpg->acl_node_list);
668 INIT_LIST_HEAD(&se_tpg->se_tpg_node);
669 INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
670 spin_lock_init(&se_tpg->acl_node_lock);
671 spin_lock_init(&se_tpg->session_lock);
672 spin_lock_init(&se_tpg->tpg_lun_lock);
673
674 if (se_tpg->proto_id >= 0) {
675 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
676 array_free(se_tpg->tpg_lun_list,
677 TRANSPORT_MAX_LUNS_PER_TPG);
678 return -ENOMEM;
679 }
680 }
681
682 spin_lock_bh(&tpg_lock);
683 list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
684 spin_unlock_bh(&tpg_lock);
685
686 pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, "
687 "Proto: %d, Portal Tag: %u\n", tfo->get_fabric_name(),
688 tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL,
689 se_tpg->proto_id, tfo->tpg_get_tag(se_tpg));
690
691 return 0;
692 }
693 EXPORT_SYMBOL(core_tpg_register);
694
695 int core_tpg_deregister(struct se_portal_group *se_tpg)
696 {
697 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
698 struct se_node_acl *nacl, *nacl_tmp;
699
700 pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, "
701 "Proto: %d, Portal Tag: %u\n", tfo->get_fabric_name(),
702 tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL,
703 se_tpg->proto_id, tfo->tpg_get_tag(se_tpg));
704
705 spin_lock_bh(&tpg_lock);
706 list_del(&se_tpg->se_tpg_node);
707 spin_unlock_bh(&tpg_lock);
708
709 while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
710 cpu_relax();
711 /*
712 * Release any remaining demo-mode generated se_node_acl that have
713 * not been released because of TFO->tpg_check_demo_mode_cache() == 1
714 * in transport_deregister_session().
715 */
716 spin_lock_irq(&se_tpg->acl_node_lock);
717 list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
718 acl_list) {
719 list_del(&nacl->acl_list);
720 se_tpg->num_node_acls--;
721 spin_unlock_irq(&se_tpg->acl_node_lock);
722
723 core_tpg_wait_for_nacl_pr_ref(nacl);
724 core_free_device_list_for_node(nacl, se_tpg);
725 kfree(nacl);
726
727 spin_lock_irq(&se_tpg->acl_node_lock);
728 }
729 spin_unlock_irq(&se_tpg->acl_node_lock);
730
731 if (se_tpg->proto_id >= 0)
732 core_tpg_remove_lun(se_tpg, &se_tpg->tpg_virt_lun0);
733
734 array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
735 return 0;
736 }
737 EXPORT_SYMBOL(core_tpg_deregister);
738
739 struct se_lun *core_tpg_alloc_lun(
740 struct se_portal_group *tpg,
741 u32 unpacked_lun)
742 {
743 struct se_lun *lun;
744
745 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
746 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
747 "-1: %u for Target Portal Group: %u\n",
748 tpg->se_tpg_tfo->get_fabric_name(),
749 unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
750 tpg->se_tpg_tfo->tpg_get_tag(tpg));
751 return ERR_PTR(-EOVERFLOW);
752 }
753
754 spin_lock(&tpg->tpg_lun_lock);
755 lun = tpg->tpg_lun_list[unpacked_lun];
756 if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
757 pr_err("TPG Logical Unit Number: %u is already active"
758 " on %s Target Portal Group: %u, ignoring request.\n",
759 unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
760 tpg->se_tpg_tfo->tpg_get_tag(tpg));
761 spin_unlock(&tpg->tpg_lun_lock);
762 return ERR_PTR(-EINVAL);
763 }
764 spin_unlock(&tpg->tpg_lun_lock);
765
766 return lun;
767 }
768
769 int core_tpg_add_lun(
770 struct se_portal_group *tpg,
771 struct se_lun *lun,
772 u32 lun_access,
773 struct se_device *dev)
774 {
775 int ret;
776
777 ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
778 GFP_KERNEL);
779 if (ret < 0)
780 return ret;
781
782 ret = core_dev_export(dev, tpg, lun);
783 if (ret < 0) {
784 percpu_ref_exit(&lun->lun_ref);
785 return ret;
786 }
787
788 spin_lock(&tpg->tpg_lun_lock);
789 lun->lun_access = lun_access;
790 lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
791 spin_unlock(&tpg->tpg_lun_lock);
792
793 return 0;
794 }
795
796 void core_tpg_remove_lun(
797 struct se_portal_group *tpg,
798 struct se_lun *lun)
799 {
800 core_clear_lun_from_tpg(lun, tpg);
801 transport_clear_lun_ref(lun);
802
803 core_dev_unexport(lun->lun_se_dev, tpg, lun);
804
805 spin_lock(&tpg->tpg_lun_lock);
806 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
807 spin_unlock(&tpg->tpg_lun_lock);
808
809 percpu_ref_exit(&lun->lun_ref);
810 }
Linux kernel - Deliverables
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