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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*******************************************************************************
3 * Filename: target_core_tpg.c
4 *
5 * This file contains generic Target Portal Group related functions.
6 *
7 * (c) Copyright 2002-2013 Datera, Inc.
8 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
11 ******************************************************************************/
12
13#include <linux/net.h>
14#include <linux/string.h>
15#include <linux/timer.h>
16#include <linux/slab.h>
17#include <linux/spinlock.h>
18#include <linux/in.h>
19#include <linux/export.h>
20#include <net/sock.h>
21#include <net/tcp.h>
22#include <scsi/scsi_proto.h>
23
24#include <target/target_core_base.h>
25#include <target/target_core_backend.h>
26#include <target/target_core_fabric.h>
27
28#include "target_core_internal.h"
29#include "target_core_alua.h"
30#include "target_core_pr.h"
31#include "target_core_ua.h"
32
33extern struct se_device *g_lun0_dev;
34static DEFINE_XARRAY_ALLOC(tpg_xa);
35
36/* __core_tpg_get_initiator_node_acl():
37 *
38 * mutex_lock(&tpg->acl_node_mutex); must be held when calling
39 */
40struct se_node_acl *__core_tpg_get_initiator_node_acl(
41 struct se_portal_group *tpg,
42 const char *initiatorname)
43{
44 struct se_node_acl *acl;
45
46 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
47 if (!strcmp(acl->initiatorname, initiatorname))
48 return acl;
49 }
50
51 return NULL;
52}
53
54/* core_tpg_get_initiator_node_acl():
55 *
56 *
57 */
58struct se_node_acl *core_tpg_get_initiator_node_acl(
59 struct se_portal_group *tpg,
60 unsigned char *initiatorname)
61{
62 struct se_node_acl *acl;
63 /*
64 * Obtain se_node_acl->acl_kref using fabric driver provided
65 * initiatorname[] during node acl endpoint lookup driven by
66 * new se_session login.
67 *
68 * The reference is held until se_session shutdown -> release
69 * occurs via fabric driver invoked transport_deregister_session()
70 * or transport_free_session() code.
71 */
72 mutex_lock(&tpg->acl_node_mutex);
73 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
74 if (acl) {
75 if (!kref_get_unless_zero(&acl->acl_kref))
76 acl = NULL;
77 }
78 mutex_unlock(&tpg->acl_node_mutex);
79
80 return acl;
81}
82EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
83
84void core_allocate_nexus_loss_ua(
85 struct se_node_acl *nacl)
86{
87 struct se_dev_entry *deve;
88
89 if (!nacl)
90 return;
91
92 rcu_read_lock();
93 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
94 core_scsi3_ua_allocate(deve, 0x29,
95 ASCQ_29H_NEXUS_LOSS_OCCURRED);
96 rcu_read_unlock();
97}
98EXPORT_SYMBOL(core_allocate_nexus_loss_ua);
99
100/* core_tpg_add_node_to_devs():
101 *
102 *
103 */
104void core_tpg_add_node_to_devs(
105 struct se_node_acl *acl,
106 struct se_portal_group *tpg,
107 struct se_lun *lun_orig)
108{
109 bool lun_access_ro = true;
110 struct se_lun *lun;
111 struct se_device *dev;
112
113 mutex_lock(&tpg->tpg_lun_mutex);
114 hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) {
115 if (lun_orig && lun != lun_orig)
116 continue;
117
118 dev = rcu_dereference_check(lun->lun_se_dev,
119 lockdep_is_held(&tpg->tpg_lun_mutex));
120 /*
121 * By default in LIO-Target $FABRIC_MOD,
122 * demo_mode_write_protect is ON, or READ_ONLY;
123 */
124 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
125 lun_access_ro = false;
126 } else {
127 /*
128 * Allow only optical drives to issue R/W in default RO
129 * demo mode.
130 */
131 if (dev->transport->get_device_type(dev) == TYPE_DISK)
132 lun_access_ro = true;
133 else
134 lun_access_ro = false;
135 }
136
137 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%llu] - Adding %s"
138 " access for LUN in Demo Mode\n",
139 tpg->se_tpg_tfo->fabric_name,
140 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
141 lun_access_ro ? "READ-ONLY" : "READ-WRITE");
142
143 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
144 lun_access_ro, acl, tpg);
145 /*
146 * Check to see if there are any existing persistent reservation
147 * APTPL pre-registrations that need to be enabled for this dynamic
148 * LUN ACL now..
149 */
150 core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
151 lun->unpacked_lun);
152 }
153 mutex_unlock(&tpg->tpg_lun_mutex);
154}
155
156static void
157target_set_nacl_queue_depth(struct se_portal_group *tpg,
158 struct se_node_acl *acl, u32 queue_depth)
159{
160 acl->queue_depth = queue_depth;
161
162 if (!acl->queue_depth) {
163 pr_warn("Queue depth for %s Initiator Node: %s is 0,"
164 "defaulting to 1.\n", tpg->se_tpg_tfo->fabric_name,
165 acl->initiatorname);
166 acl->queue_depth = 1;
167 }
168}
169
170static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg,
171 const unsigned char *initiatorname)
172{
173 struct se_node_acl *acl;
174 u32 queue_depth;
175
176 acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size),
177 GFP_KERNEL);
178 if (!acl)
179 return NULL;
180
181 INIT_LIST_HEAD(&acl->acl_list);
182 INIT_LIST_HEAD(&acl->acl_sess_list);
183 INIT_HLIST_HEAD(&acl->lun_entry_hlist);
184 kref_init(&acl->acl_kref);
185 init_completion(&acl->acl_free_comp);
186 spin_lock_init(&acl->nacl_sess_lock);
187 mutex_init(&acl->lun_entry_mutex);
188 atomic_set(&acl->acl_pr_ref_count, 0);
189
190 if (tpg->se_tpg_tfo->tpg_get_default_depth)
191 queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
192 else
193 queue_depth = 1;
194 target_set_nacl_queue_depth(tpg, acl, queue_depth);
195
196 snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
197 acl->se_tpg = tpg;
198 acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
199
200 tpg->se_tpg_tfo->set_default_node_attributes(acl);
201
202 return acl;
203}
204
205static void target_add_node_acl(struct se_node_acl *acl)
206{
207 struct se_portal_group *tpg = acl->se_tpg;
208
209 mutex_lock(&tpg->acl_node_mutex);
210 list_add_tail(&acl->acl_list, &tpg->acl_node_list);
211 mutex_unlock(&tpg->acl_node_mutex);
212
213 pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s"
214 " Initiator Node: %s\n",
215 tpg->se_tpg_tfo->fabric_name,
216 tpg->se_tpg_tfo->tpg_get_tag(tpg),
217 acl->dynamic_node_acl ? "DYNAMIC" : "",
218 acl->queue_depth,
219 tpg->se_tpg_tfo->fabric_name,
220 acl->initiatorname);
221}
222
223bool target_tpg_has_node_acl(struct se_portal_group *tpg,
224 const char *initiatorname)
225{
226 struct se_node_acl *acl;
227 bool found = false;
228
229 mutex_lock(&tpg->acl_node_mutex);
230 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
231 if (!strcmp(acl->initiatorname, initiatorname)) {
232 found = true;
233 break;
234 }
235 }
236 mutex_unlock(&tpg->acl_node_mutex);
237
238 return found;
239}
240EXPORT_SYMBOL(target_tpg_has_node_acl);
241
242struct se_node_acl *core_tpg_check_initiator_node_acl(
243 struct se_portal_group *tpg,
244 unsigned char *initiatorname)
245{
246 struct se_node_acl *acl;
247
248 acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
249 if (acl)
250 return acl;
251
252 if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
253 return NULL;
254
255 acl = target_alloc_node_acl(tpg, initiatorname);
256 if (!acl)
257 return NULL;
258 /*
259 * When allocating a dynamically generated node_acl, go ahead
260 * and take the extra kref now before returning to the fabric
261 * driver caller.
262 *
263 * Note this reference will be released at session shutdown
264 * time within transport_free_session() code.
265 */
266 kref_get(&acl->acl_kref);
267 acl->dynamic_node_acl = 1;
268
269 /*
270 * Here we only create demo-mode MappedLUNs from the active
271 * TPG LUNs if the fabric is not explicitly asking for
272 * tpg_check_demo_mode_login_only() == 1.
273 */
274 if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
275 (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
276 core_tpg_add_node_to_devs(acl, tpg, NULL);
277
278 target_add_node_acl(acl);
279 return acl;
280}
281EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
282
283void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
284{
285 while (atomic_read(&nacl->acl_pr_ref_count) != 0)
286 cpu_relax();
287}
288
289struct se_node_acl *core_tpg_add_initiator_node_acl(
290 struct se_portal_group *tpg,
291 const char *initiatorname)
292{
293 struct se_node_acl *acl;
294
295 mutex_lock(&tpg->acl_node_mutex);
296 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
297 if (acl) {
298 if (acl->dynamic_node_acl) {
299 acl->dynamic_node_acl = 0;
300 pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
301 " for %s\n", tpg->se_tpg_tfo->fabric_name,
302 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
303 mutex_unlock(&tpg->acl_node_mutex);
304 return acl;
305 }
306
307 pr_err("ACL entry for %s Initiator"
308 " Node %s already exists for TPG %u, ignoring"
309 " request.\n", tpg->se_tpg_tfo->fabric_name,
310 initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
311 mutex_unlock(&tpg->acl_node_mutex);
312 return ERR_PTR(-EEXIST);
313 }
314 mutex_unlock(&tpg->acl_node_mutex);
315
316 acl = target_alloc_node_acl(tpg, initiatorname);
317 if (!acl)
318 return ERR_PTR(-ENOMEM);
319
320 target_add_node_acl(acl);
321 return acl;
322}
323
324static void target_shutdown_sessions(struct se_node_acl *acl)
325{
326 struct se_session *sess;
327 unsigned long flags;
328
329restart:
330 spin_lock_irqsave(&acl->nacl_sess_lock, flags);
331 list_for_each_entry(sess, &acl->acl_sess_list, sess_acl_list) {
332 if (sess->cmd_cnt && atomic_read(&sess->cmd_cnt->stopped))
333 continue;
334
335 list_del_init(&sess->sess_acl_list);
336 spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
337
338 if (acl->se_tpg->se_tpg_tfo->close_session)
339 acl->se_tpg->se_tpg_tfo->close_session(sess);
340 goto restart;
341 }
342 spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
343}
344
345void core_tpg_del_initiator_node_acl(struct se_node_acl *acl)
346{
347 struct se_portal_group *tpg = acl->se_tpg;
348
349 mutex_lock(&tpg->acl_node_mutex);
350 if (acl->dynamic_node_acl)
351 acl->dynamic_node_acl = 0;
352 list_del_init(&acl->acl_list);
353 mutex_unlock(&tpg->acl_node_mutex);
354
355 target_shutdown_sessions(acl);
356
357 target_put_nacl(acl);
358 /*
359 * Wait for last target_put_nacl() to complete in target_complete_nacl()
360 * for active fabric session transport_deregister_session() callbacks.
361 */
362 wait_for_completion(&acl->acl_free_comp);
363
364 core_tpg_wait_for_nacl_pr_ref(acl);
365 core_free_device_list_for_node(acl, tpg);
366
367 pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
368 " Initiator Node: %s\n", tpg->se_tpg_tfo->fabric_name,
369 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
370 tpg->se_tpg_tfo->fabric_name, acl->initiatorname);
371
372 kfree(acl);
373}
374
375/* core_tpg_set_initiator_node_queue_depth():
376 *
377 *
378 */
379int core_tpg_set_initiator_node_queue_depth(
380 struct se_node_acl *acl,
381 u32 queue_depth)
382{
383 struct se_portal_group *tpg = acl->se_tpg;
384
385 /*
386 * Allow the setting of se_node_acl queue_depth to be idempotent,
387 * and not force a session shutdown event if the value is not
388 * changing.
389 */
390 if (acl->queue_depth == queue_depth)
391 return 0;
392 /*
393 * User has requested to change the queue depth for a Initiator Node.
394 * Change the value in the Node's struct se_node_acl, and call
395 * target_set_nacl_queue_depth() to set the new queue depth.
396 */
397 target_set_nacl_queue_depth(tpg, acl, queue_depth);
398
399 /*
400 * Shutdown all pending sessions to force session reinstatement.
401 */
402 target_shutdown_sessions(acl);
403
404 pr_debug("Successfully changed queue depth to: %d for Initiator"
405 " Node: %s on %s Target Portal Group: %u\n", acl->queue_depth,
406 acl->initiatorname, tpg->se_tpg_tfo->fabric_name,
407 tpg->se_tpg_tfo->tpg_get_tag(tpg));
408
409 return 0;
410}
411EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
412
413/* core_tpg_set_initiator_node_tag():
414 *
415 * Initiator nodeacl tags are not used internally, but may be used by
416 * userspace to emulate aliases or groups.
417 * Returns length of newly-set tag or -EINVAL.
418 */
419int core_tpg_set_initiator_node_tag(
420 struct se_portal_group *tpg,
421 struct se_node_acl *acl,
422 const char *new_tag)
423{
424 if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
425 return -EINVAL;
426
427 if (!strncmp("NULL", new_tag, 4)) {
428 acl->acl_tag[0] = '\0';
429 return 0;
430 }
431
432 return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
433}
434EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
435
436static void core_tpg_lun_ref_release(struct percpu_ref *ref)
437{
438 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
439
440 complete(&lun->lun_shutdown_comp);
441}
442
443static int target_tpg_register_rtpi(struct se_portal_group *se_tpg)
444{
445 u32 val;
446 int ret;
447
448 if (se_tpg->rtpi_manual) {
449 ret = xa_insert(&tpg_xa, se_tpg->tpg_rtpi, se_tpg, GFP_KERNEL);
450 if (ret) {
451 pr_info("%s_TPG[%hu] - Can not set RTPI %#x, it is already busy",
452 se_tpg->se_tpg_tfo->fabric_name,
453 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg),
454 se_tpg->tpg_rtpi);
455 return -EINVAL;
456 }
457 } else {
458 ret = xa_alloc(&tpg_xa, &val, se_tpg,
459 XA_LIMIT(1, USHRT_MAX), GFP_KERNEL);
460 if (!ret)
461 se_tpg->tpg_rtpi = val;
462 }
463
464 return ret;
465}
466
467static void target_tpg_deregister_rtpi(struct se_portal_group *se_tpg)
468{
469 if (se_tpg->tpg_rtpi && se_tpg->enabled)
470 xa_erase(&tpg_xa, se_tpg->tpg_rtpi);
471}
472
473int target_tpg_enable(struct se_portal_group *se_tpg)
474{
475 int ret;
476
477 ret = target_tpg_register_rtpi(se_tpg);
478 if (ret)
479 return ret;
480
481 ret = se_tpg->se_tpg_tfo->fabric_enable_tpg(se_tpg, true);
482 if (ret) {
483 target_tpg_deregister_rtpi(se_tpg);
484 return ret;
485 }
486
487 se_tpg->enabled = true;
488
489 return 0;
490}
491
492int target_tpg_disable(struct se_portal_group *se_tpg)
493{
494 int ret;
495
496 target_tpg_deregister_rtpi(se_tpg);
497
498 ret = se_tpg->se_tpg_tfo->fabric_enable_tpg(se_tpg, false);
499 if (!ret)
500 se_tpg->enabled = false;
501
502 return ret;
503}
504
505/* Does not change se_wwn->priv. */
506int core_tpg_register(
507 struct se_wwn *se_wwn,
508 struct se_portal_group *se_tpg,
509 int proto_id)
510{
511 int ret;
512
513 if (!se_tpg)
514 return -EINVAL;
515 /*
516 * For the typical case where core_tpg_register() is called by a
517 * fabric driver from target_core_fabric_ops->fabric_make_tpg()
518 * configfs context, use the original tf_ops pointer already saved
519 * by target-core in target_fabric_make_wwn().
520 *
521 * Otherwise, for special cases like iscsi-target discovery TPGs
522 * the caller is responsible for setting ->se_tpg_tfo ahead of
523 * calling core_tpg_register().
524 */
525 if (se_wwn)
526 se_tpg->se_tpg_tfo = se_wwn->wwn_tf->tf_ops;
527
528 if (!se_tpg->se_tpg_tfo) {
529 pr_err("Unable to locate se_tpg->se_tpg_tfo pointer\n");
530 return -EINVAL;
531 }
532
533 INIT_HLIST_HEAD(&se_tpg->tpg_lun_hlist);
534 se_tpg->proto_id = proto_id;
535 se_tpg->se_tpg_wwn = se_wwn;
536 atomic_set(&se_tpg->tpg_pr_ref_count, 0);
537 INIT_LIST_HEAD(&se_tpg->acl_node_list);
538 INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
539 spin_lock_init(&se_tpg->session_lock);
540 mutex_init(&se_tpg->tpg_lun_mutex);
541 mutex_init(&se_tpg->acl_node_mutex);
542
543 if (se_tpg->proto_id >= 0) {
544 se_tpg->tpg_virt_lun0 = core_tpg_alloc_lun(se_tpg, 0);
545 if (IS_ERR(se_tpg->tpg_virt_lun0))
546 return PTR_ERR(se_tpg->tpg_virt_lun0);
547
548 ret = core_tpg_add_lun(se_tpg, se_tpg->tpg_virt_lun0,
549 true, g_lun0_dev);
550 if (ret < 0) {
551 kfree(se_tpg->tpg_virt_lun0);
552 return ret;
553 }
554 }
555
556 pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, "
557 "Proto: %d, Portal Tag: %u\n", se_tpg->se_tpg_tfo->fabric_name,
558 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) ?
559 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) : NULL,
560 se_tpg->proto_id, se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
561
562 return 0;
563}
564EXPORT_SYMBOL(core_tpg_register);
565
566int core_tpg_deregister(struct se_portal_group *se_tpg)
567{
568 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
569 struct se_node_acl *nacl, *nacl_tmp;
570 LIST_HEAD(node_list);
571
572 pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, "
573 "Proto: %d, Portal Tag: %u\n", tfo->fabric_name,
574 tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL,
575 se_tpg->proto_id, tfo->tpg_get_tag(se_tpg));
576
577 while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
578 cpu_relax();
579
580 mutex_lock(&se_tpg->acl_node_mutex);
581 list_splice_init(&se_tpg->acl_node_list, &node_list);
582 mutex_unlock(&se_tpg->acl_node_mutex);
583 /*
584 * Release any remaining demo-mode generated se_node_acl that have
585 * not been released because of TFO->tpg_check_demo_mode_cache() == 1
586 * in transport_deregister_session().
587 */
588 list_for_each_entry_safe(nacl, nacl_tmp, &node_list, acl_list) {
589 list_del_init(&nacl->acl_list);
590
591 core_tpg_wait_for_nacl_pr_ref(nacl);
592 core_free_device_list_for_node(nacl, se_tpg);
593 kfree(nacl);
594 }
595
596 if (se_tpg->proto_id >= 0) {
597 core_tpg_remove_lun(se_tpg, se_tpg->tpg_virt_lun0);
598 kfree_rcu(se_tpg->tpg_virt_lun0, rcu_head);
599 }
600
601 target_tpg_deregister_rtpi(se_tpg);
602
603 return 0;
604}
605EXPORT_SYMBOL(core_tpg_deregister);
606
607struct se_lun *core_tpg_alloc_lun(
608 struct se_portal_group *tpg,
609 u64 unpacked_lun)
610{
611 struct se_lun *lun;
612
613 lun = kzalloc(sizeof(*lun), GFP_KERNEL);
614 if (!lun) {
615 pr_err("Unable to allocate se_lun memory\n");
616 return ERR_PTR(-ENOMEM);
617 }
618 lun->unpacked_lun = unpacked_lun;
619 atomic_set(&lun->lun_acl_count, 0);
620 init_completion(&lun->lun_shutdown_comp);
621 INIT_LIST_HEAD(&lun->lun_deve_list);
622 INIT_LIST_HEAD(&lun->lun_dev_link);
623 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
624 spin_lock_init(&lun->lun_deve_lock);
625 mutex_init(&lun->lun_tg_pt_md_mutex);
626 INIT_LIST_HEAD(&lun->lun_tg_pt_gp_link);
627 spin_lock_init(&lun->lun_tg_pt_gp_lock);
628 lun->lun_tpg = tpg;
629
630 return lun;
631}
632
633int core_tpg_add_lun(
634 struct se_portal_group *tpg,
635 struct se_lun *lun,
636 bool lun_access_ro,
637 struct se_device *dev)
638{
639 int ret;
640
641 ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
642 GFP_KERNEL);
643 if (ret < 0)
644 goto out;
645
646 if (!(dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
647 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
648 target_attach_tg_pt_gp(lun, dev->t10_alua.default_tg_pt_gp);
649
650 mutex_lock(&tpg->tpg_lun_mutex);
651
652 spin_lock(&dev->se_port_lock);
653 lun->lun_index = dev->dev_index;
654 rcu_assign_pointer(lun->lun_se_dev, dev);
655 dev->export_count++;
656 list_add_tail(&lun->lun_dev_link, &dev->dev_sep_list);
657 spin_unlock(&dev->se_port_lock);
658
659 if (dev->dev_flags & DF_READ_ONLY)
660 lun->lun_access_ro = true;
661 else
662 lun->lun_access_ro = lun_access_ro;
663 if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
664 hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist);
665 mutex_unlock(&tpg->tpg_lun_mutex);
666
667 return 0;
668
669out:
670 return ret;
671}
672
673void core_tpg_remove_lun(
674 struct se_portal_group *tpg,
675 struct se_lun *lun)
676{
677 /*
678 * rcu_dereference_raw protected by se_lun->lun_group symlink
679 * reference to se_device->dev_group.
680 */
681 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
682
683 lun->lun_shutdown = true;
684
685 core_clear_lun_from_tpg(lun, tpg);
686 /*
687 * Wait for any active I/O references to percpu se_lun->lun_ref to
688 * be released. Also, se_lun->lun_ref is now used by PR and ALUA
689 * logic when referencing a remote target port during ALL_TGT_PT=1
690 * and generating UNIT_ATTENTIONs for ALUA access state transition.
691 */
692 transport_clear_lun_ref(lun);
693
694 mutex_lock(&tpg->tpg_lun_mutex);
695 if (lun->lun_se_dev) {
696 target_detach_tg_pt_gp(lun);
697
698 spin_lock(&dev->se_port_lock);
699 list_del(&lun->lun_dev_link);
700 dev->export_count--;
701 rcu_assign_pointer(lun->lun_se_dev, NULL);
702 spin_unlock(&dev->se_port_lock);
703 }
704 if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
705 hlist_del_rcu(&lun->link);
706
707 lun->lun_shutdown = false;
708 mutex_unlock(&tpg->tpg_lun_mutex);
709
710 percpu_ref_exit(&lun->lun_ref);
711}
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
44extern struct se_device *g_lun0_dev;
45
46static DEFINE_SPINLOCK(tpg_lock);
47static LIST_HEAD(tpg_list);
48
49/* core_clear_initiator_node_from_tpg():
50 *
51 *
52 */
53static void core_clear_initiator_node_from_tpg(
54 struct se_node_acl *nacl,
55 struct se_portal_group *tpg)
56{
57 int i;
58 struct se_dev_entry *deve;
59 struct se_lun *lun;
60
61 spin_lock_irq(&nacl->device_list_lock);
62 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
63 deve = nacl->device_list[i];
64
65 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
66 continue;
67
68 if (!deve->se_lun) {
69 pr_err("%s device entries device pointer is"
70 " NULL, but Initiator has access.\n",
71 tpg->se_tpg_tfo->get_fabric_name());
72 continue;
73 }
74
75 lun = deve->se_lun;
76 spin_unlock_irq(&nacl->device_list_lock);
77 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
78 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
79
80 spin_lock_irq(&nacl->device_list_lock);
81 }
82 spin_unlock_irq(&nacl->device_list_lock);
83}
84
85/* __core_tpg_get_initiator_node_acl():
86 *
87 * spin_lock_bh(&tpg->acl_node_lock); must be held when calling
88 */
89struct se_node_acl *__core_tpg_get_initiator_node_acl(
90 struct se_portal_group *tpg,
91 const char *initiatorname)
92{
93 struct se_node_acl *acl;
94
95 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
96 if (!strcmp(acl->initiatorname, initiatorname))
97 return acl;
98 }
99
100 return NULL;
101}
102
103/* core_tpg_get_initiator_node_acl():
104 *
105 *
106 */
107struct se_node_acl *core_tpg_get_initiator_node_acl(
108 struct se_portal_group *tpg,
109 unsigned char *initiatorname)
110{
111 struct se_node_acl *acl;
112
113 spin_lock_irq(&tpg->acl_node_lock);
114 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
115 spin_unlock_irq(&tpg->acl_node_lock);
116
117 return acl;
118}
119EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
120
121/* core_tpg_add_node_to_devs():
122 *
123 *
124 */
125void core_tpg_add_node_to_devs(
126 struct se_node_acl *acl,
127 struct se_portal_group *tpg)
128{
129 int i = 0;
130 u32 lun_access = 0;
131 struct se_lun *lun;
132 struct se_device *dev;
133
134 spin_lock(&tpg->tpg_lun_lock);
135 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
136 lun = tpg->tpg_lun_list[i];
137 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
138 continue;
139
140 spin_unlock(&tpg->tpg_lun_lock);
141
142 dev = lun->lun_se_dev;
143 /*
144 * By default in LIO-Target $FABRIC_MOD,
145 * demo_mode_write_protect is ON, or READ_ONLY;
146 */
147 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
148 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
149 } else {
150 /*
151 * Allow only optical drives to issue R/W in default RO
152 * demo mode.
153 */
154 if (dev->transport->get_device_type(dev) == TYPE_DISK)
155 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
156 else
157 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
158 }
159
160 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
161 " access for LUN in Demo Mode\n",
162 tpg->se_tpg_tfo->get_fabric_name(),
163 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
164 (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
165 "READ-WRITE" : "READ-ONLY");
166
167 core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
168 lun_access, acl, tpg);
169 spin_lock(&tpg->tpg_lun_lock);
170 }
171 spin_unlock(&tpg->tpg_lun_lock);
172}
173
174/* core_set_queue_depth_for_node():
175 *
176 *
177 */
178static int core_set_queue_depth_for_node(
179 struct se_portal_group *tpg,
180 struct se_node_acl *acl)
181{
182 if (!acl->queue_depth) {
183 pr_err("Queue depth for %s Initiator Node: %s is 0,"
184 "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
185 acl->initiatorname);
186 acl->queue_depth = 1;
187 }
188
189 return 0;
190}
191
192void array_free(void *array, int n)
193{
194 void **a = array;
195 int i;
196
197 for (i = 0; i < n; i++)
198 kfree(a[i]);
199 kfree(a);
200}
201
202static void *array_zalloc(int n, size_t size, gfp_t flags)
203{
204 void **a;
205 int i;
206
207 a = kzalloc(n * sizeof(void*), flags);
208 if (!a)
209 return NULL;
210 for (i = 0; i < n; i++) {
211 a[i] = kzalloc(size, flags);
212 if (!a[i]) {
213 array_free(a, n);
214 return NULL;
215 }
216 }
217 return a;
218}
219
220/* core_create_device_list_for_node():
221 *
222 *
223 */
224static int core_create_device_list_for_node(struct se_node_acl *nacl)
225{
226 struct se_dev_entry *deve;
227 int i;
228
229 nacl->device_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
230 sizeof(struct se_dev_entry), GFP_KERNEL);
231 if (!nacl->device_list) {
232 pr_err("Unable to allocate memory for"
233 " struct se_node_acl->device_list\n");
234 return -ENOMEM;
235 }
236 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
237 deve = nacl->device_list[i];
238
239 atomic_set(&deve->ua_count, 0);
240 atomic_set(&deve->pr_ref_count, 0);
241 spin_lock_init(&deve->ua_lock);
242 INIT_LIST_HEAD(&deve->alua_port_list);
243 INIT_LIST_HEAD(&deve->ua_list);
244 }
245
246 return 0;
247}
248
249/* core_tpg_check_initiator_node_acl()
250 *
251 *
252 */
253struct se_node_acl *core_tpg_check_initiator_node_acl(
254 struct se_portal_group *tpg,
255 unsigned char *initiatorname)
256{
257 struct se_node_acl *acl;
258
259 acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
260 if (acl)
261 return acl;
262
263 if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
264 return NULL;
265
266 acl = tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
267 if (!acl)
268 return NULL;
269
270 INIT_LIST_HEAD(&acl->acl_list);
271 INIT_LIST_HEAD(&acl->acl_sess_list);
272 kref_init(&acl->acl_kref);
273 init_completion(&acl->acl_free_comp);
274 spin_lock_init(&acl->device_list_lock);
275 spin_lock_init(&acl->nacl_sess_lock);
276 atomic_set(&acl->acl_pr_ref_count, 0);
277 acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
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 acl->dynamic_node_acl = 1;
282
283 tpg->se_tpg_tfo->set_default_node_attributes(acl);
284
285 if (core_create_device_list_for_node(acl) < 0) {
286 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
287 return NULL;
288 }
289
290 if (core_set_queue_depth_for_node(tpg, acl) < 0) {
291 core_free_device_list_for_node(acl, tpg);
292 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
293 return NULL;
294 }
295 /*
296 * Here we only create demo-mode MappedLUNs from the active
297 * TPG LUNs if the fabric is not explicitly asking for
298 * tpg_check_demo_mode_login_only() == 1.
299 */
300 if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
301 (tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
302 core_tpg_add_node_to_devs(acl, tpg);
303
304 spin_lock_irq(&tpg->acl_node_lock);
305 list_add_tail(&acl->acl_list, &tpg->acl_node_list);
306 tpg->num_node_acls++;
307 spin_unlock_irq(&tpg->acl_node_lock);
308
309 pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"
310 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
311 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
312 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
313
314 return acl;
315}
316EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
317
318void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
319{
320 while (atomic_read(&nacl->acl_pr_ref_count) != 0)
321 cpu_relax();
322}
323
324void core_tpg_clear_object_luns(struct se_portal_group *tpg)
325{
326 int i;
327 struct se_lun *lun;
328
329 spin_lock(&tpg->tpg_lun_lock);
330 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
331 lun = tpg->tpg_lun_list[i];
332
333 if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) ||
334 (lun->lun_se_dev == NULL))
335 continue;
336
337 spin_unlock(&tpg->tpg_lun_lock);
338 core_dev_del_lun(tpg, lun->unpacked_lun);
339 spin_lock(&tpg->tpg_lun_lock);
340 }
341 spin_unlock(&tpg->tpg_lun_lock);
342}
343EXPORT_SYMBOL(core_tpg_clear_object_luns);
344
345/* core_tpg_add_initiator_node_acl():
346 *
347 *
348 */
349struct se_node_acl *core_tpg_add_initiator_node_acl(
350 struct se_portal_group *tpg,
351 struct se_node_acl *se_nacl,
352 const char *initiatorname,
353 u32 queue_depth)
354{
355 struct se_node_acl *acl = NULL;
356
357 spin_lock_irq(&tpg->acl_node_lock);
358 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
359 if (acl) {
360 if (acl->dynamic_node_acl) {
361 acl->dynamic_node_acl = 0;
362 pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
363 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
364 tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
365 spin_unlock_irq(&tpg->acl_node_lock);
366 /*
367 * Release the locally allocated struct se_node_acl
368 * because * core_tpg_add_initiator_node_acl() returned
369 * a pointer to an existing demo mode node ACL.
370 */
371 if (se_nacl)
372 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg,
373 se_nacl);
374 goto done;
375 }
376
377 pr_err("ACL entry for %s Initiator"
378 " Node %s already exists for TPG %u, ignoring"
379 " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
380 initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
381 spin_unlock_irq(&tpg->acl_node_lock);
382 return ERR_PTR(-EEXIST);
383 }
384 spin_unlock_irq(&tpg->acl_node_lock);
385
386 if (!se_nacl) {
387 pr_err("struct se_node_acl pointer is NULL\n");
388 return ERR_PTR(-EINVAL);
389 }
390 /*
391 * For v4.x logic the se_node_acl_s is hanging off a fabric
392 * dependent structure allocated via
393 * struct target_core_fabric_ops->fabric_make_nodeacl()
394 */
395 acl = se_nacl;
396
397 INIT_LIST_HEAD(&acl->acl_list);
398 INIT_LIST_HEAD(&acl->acl_sess_list);
399 kref_init(&acl->acl_kref);
400 init_completion(&acl->acl_free_comp);
401 spin_lock_init(&acl->device_list_lock);
402 spin_lock_init(&acl->nacl_sess_lock);
403 atomic_set(&acl->acl_pr_ref_count, 0);
404 acl->queue_depth = queue_depth;
405 snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
406 acl->se_tpg = tpg;
407 acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
408
409 tpg->se_tpg_tfo->set_default_node_attributes(acl);
410
411 if (core_create_device_list_for_node(acl) < 0) {
412 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
413 return ERR_PTR(-ENOMEM);
414 }
415
416 if (core_set_queue_depth_for_node(tpg, acl) < 0) {
417 core_free_device_list_for_node(acl, tpg);
418 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
419 return ERR_PTR(-EINVAL);
420 }
421
422 spin_lock_irq(&tpg->acl_node_lock);
423 list_add_tail(&acl->acl_list, &tpg->acl_node_list);
424 tpg->num_node_acls++;
425 spin_unlock_irq(&tpg->acl_node_lock);
426
427done:
428 pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
429 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
430 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
431 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
432
433 return acl;
434}
435EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
436
437/* core_tpg_del_initiator_node_acl():
438 *
439 *
440 */
441int core_tpg_del_initiator_node_acl(
442 struct se_portal_group *tpg,
443 struct se_node_acl *acl,
444 int force)
445{
446 LIST_HEAD(sess_list);
447 struct se_session *sess, *sess_tmp;
448 unsigned long flags;
449 int rc;
450
451 spin_lock_irq(&tpg->acl_node_lock);
452 if (acl->dynamic_node_acl) {
453 acl->dynamic_node_acl = 0;
454 }
455 list_del(&acl->acl_list);
456 tpg->num_node_acls--;
457 spin_unlock_irq(&tpg->acl_node_lock);
458
459 spin_lock_irqsave(&acl->nacl_sess_lock, flags);
460 acl->acl_stop = 1;
461
462 list_for_each_entry_safe(sess, sess_tmp, &acl->acl_sess_list,
463 sess_acl_list) {
464 if (sess->sess_tearing_down != 0)
465 continue;
466
467 target_get_session(sess);
468 list_move(&sess->sess_acl_list, &sess_list);
469 }
470 spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
471
472 list_for_each_entry_safe(sess, sess_tmp, &sess_list, sess_acl_list) {
473 list_del(&sess->sess_acl_list);
474
475 rc = tpg->se_tpg_tfo->shutdown_session(sess);
476 target_put_session(sess);
477 if (!rc)
478 continue;
479 target_put_session(sess);
480 }
481 target_put_nacl(acl);
482 /*
483 * Wait for last target_put_nacl() to complete in target_complete_nacl()
484 * for active fabric session transport_deregister_session() callbacks.
485 */
486 wait_for_completion(&acl->acl_free_comp);
487
488 core_tpg_wait_for_nacl_pr_ref(acl);
489 core_clear_initiator_node_from_tpg(acl, tpg);
490 core_free_device_list_for_node(acl, tpg);
491
492 pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
493 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
494 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
495 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
496
497 return 0;
498}
499EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
500
501/* core_tpg_set_initiator_node_queue_depth():
502 *
503 *
504 */
505int core_tpg_set_initiator_node_queue_depth(
506 struct se_portal_group *tpg,
507 unsigned char *initiatorname,
508 u32 queue_depth,
509 int force)
510{
511 struct se_session *sess, *init_sess = NULL;
512 struct se_node_acl *acl;
513 unsigned long flags;
514 int dynamic_acl = 0;
515
516 spin_lock_irq(&tpg->acl_node_lock);
517 acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
518 if (!acl) {
519 pr_err("Access Control List entry for %s Initiator"
520 " Node %s does not exists for TPG %hu, ignoring"
521 " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
522 initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
523 spin_unlock_irq(&tpg->acl_node_lock);
524 return -ENODEV;
525 }
526 if (acl->dynamic_node_acl) {
527 acl->dynamic_node_acl = 0;
528 dynamic_acl = 1;
529 }
530 spin_unlock_irq(&tpg->acl_node_lock);
531
532 spin_lock_irqsave(&tpg->session_lock, flags);
533 list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
534 if (sess->se_node_acl != acl)
535 continue;
536
537 if (!force) {
538 pr_err("Unable to change queue depth for %s"
539 " Initiator Node: %s while session is"
540 " operational. To forcefully change the queue"
541 " depth and force session reinstatement"
542 " use the \"force=1\" parameter.\n",
543 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
544 spin_unlock_irqrestore(&tpg->session_lock, flags);
545
546 spin_lock_irq(&tpg->acl_node_lock);
547 if (dynamic_acl)
548 acl->dynamic_node_acl = 1;
549 spin_unlock_irq(&tpg->acl_node_lock);
550 return -EEXIST;
551 }
552 /*
553 * Determine if the session needs to be closed by our context.
554 */
555 if (!tpg->se_tpg_tfo->shutdown_session(sess))
556 continue;
557
558 init_sess = sess;
559 break;
560 }
561
562 /*
563 * User has requested to change the queue depth for a Initiator Node.
564 * Change the value in the Node's struct se_node_acl, and call
565 * core_set_queue_depth_for_node() to add the requested queue depth.
566 *
567 * Finally call tpg->se_tpg_tfo->close_session() to force session
568 * reinstatement to occur if there is an active session for the
569 * $FABRIC_MOD Initiator Node in question.
570 */
571 acl->queue_depth = queue_depth;
572
573 if (core_set_queue_depth_for_node(tpg, acl) < 0) {
574 spin_unlock_irqrestore(&tpg->session_lock, flags);
575 /*
576 * Force session reinstatement if
577 * core_set_queue_depth_for_node() failed, because we assume
578 * the $FABRIC_MOD has already the set session reinstatement
579 * bit from tpg->se_tpg_tfo->shutdown_session() called above.
580 */
581 if (init_sess)
582 tpg->se_tpg_tfo->close_session(init_sess);
583
584 spin_lock_irq(&tpg->acl_node_lock);
585 if (dynamic_acl)
586 acl->dynamic_node_acl = 1;
587 spin_unlock_irq(&tpg->acl_node_lock);
588 return -EINVAL;
589 }
590 spin_unlock_irqrestore(&tpg->session_lock, flags);
591 /*
592 * If the $FABRIC_MOD session for the Initiator Node ACL exists,
593 * forcefully shutdown the $FABRIC_MOD session/nexus.
594 */
595 if (init_sess)
596 tpg->se_tpg_tfo->close_session(init_sess);
597
598 pr_debug("Successfully changed queue depth to: %d for Initiator"
599 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
600 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
601 tpg->se_tpg_tfo->tpg_get_tag(tpg));
602
603 spin_lock_irq(&tpg->acl_node_lock);
604 if (dynamic_acl)
605 acl->dynamic_node_acl = 1;
606 spin_unlock_irq(&tpg->acl_node_lock);
607
608 return 0;
609}
610EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
611
612/* core_tpg_set_initiator_node_tag():
613 *
614 * Initiator nodeacl tags are not used internally, but may be used by
615 * userspace to emulate aliases or groups.
616 * Returns length of newly-set tag or -EINVAL.
617 */
618int core_tpg_set_initiator_node_tag(
619 struct se_portal_group *tpg,
620 struct se_node_acl *acl,
621 const char *new_tag)
622{
623 if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
624 return -EINVAL;
625
626 if (!strncmp("NULL", new_tag, 4)) {
627 acl->acl_tag[0] = '\0';
628 return 0;
629 }
630
631 return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
632}
633EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
634
635static void core_tpg_lun_ref_release(struct percpu_ref *ref)
636{
637 struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
638
639 complete(&lun->lun_ref_comp);
640}
641
642static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
643{
644 /* Set in core_dev_setup_virtual_lun0() */
645 struct se_device *dev = g_lun0_dev;
646 struct se_lun *lun = &se_tpg->tpg_virt_lun0;
647 u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
648 int ret;
649
650 lun->unpacked_lun = 0;
651 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
652 atomic_set(&lun->lun_acl_count, 0);
653 init_completion(&lun->lun_shutdown_comp);
654 INIT_LIST_HEAD(&lun->lun_acl_list);
655 spin_lock_init(&lun->lun_acl_lock);
656 spin_lock_init(&lun->lun_sep_lock);
657 init_completion(&lun->lun_ref_comp);
658
659 ret = core_tpg_add_lun(se_tpg, lun, lun_access, dev);
660 if (ret < 0)
661 return ret;
662
663 return 0;
664}
665
666static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
667{
668 struct se_lun *lun = &se_tpg->tpg_virt_lun0;
669
670 core_tpg_post_dellun(se_tpg, lun);
671}
672
673int core_tpg_register(
674 struct target_core_fabric_ops *tfo,
675 struct se_wwn *se_wwn,
676 struct se_portal_group *se_tpg,
677 void *tpg_fabric_ptr,
678 int se_tpg_type)
679{
680 struct se_lun *lun;
681 u32 i;
682
683 se_tpg->tpg_lun_list = array_zalloc(TRANSPORT_MAX_LUNS_PER_TPG,
684 sizeof(struct se_lun), GFP_KERNEL);
685 if (!se_tpg->tpg_lun_list) {
686 pr_err("Unable to allocate struct se_portal_group->"
687 "tpg_lun_list\n");
688 return -ENOMEM;
689 }
690
691 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
692 lun = se_tpg->tpg_lun_list[i];
693 lun->unpacked_lun = i;
694 lun->lun_link_magic = SE_LUN_LINK_MAGIC;
695 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
696 atomic_set(&lun->lun_acl_count, 0);
697 init_completion(&lun->lun_shutdown_comp);
698 INIT_LIST_HEAD(&lun->lun_acl_list);
699 spin_lock_init(&lun->lun_acl_lock);
700 spin_lock_init(&lun->lun_sep_lock);
701 init_completion(&lun->lun_ref_comp);
702 }
703
704 se_tpg->se_tpg_type = se_tpg_type;
705 se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
706 se_tpg->se_tpg_tfo = tfo;
707 se_tpg->se_tpg_wwn = se_wwn;
708 atomic_set(&se_tpg->tpg_pr_ref_count, 0);
709 INIT_LIST_HEAD(&se_tpg->acl_node_list);
710 INIT_LIST_HEAD(&se_tpg->se_tpg_node);
711 INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
712 spin_lock_init(&se_tpg->acl_node_lock);
713 spin_lock_init(&se_tpg->session_lock);
714 spin_lock_init(&se_tpg->tpg_lun_lock);
715
716 if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
717 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
718 array_free(se_tpg->tpg_lun_list,
719 TRANSPORT_MAX_LUNS_PER_TPG);
720 return -ENOMEM;
721 }
722 }
723
724 spin_lock_bh(&tpg_lock);
725 list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
726 spin_unlock_bh(&tpg_lock);
727
728 pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
729 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
730 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
731 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
732 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
733
734 return 0;
735}
736EXPORT_SYMBOL(core_tpg_register);
737
738int core_tpg_deregister(struct se_portal_group *se_tpg)
739{
740 struct se_node_acl *nacl, *nacl_tmp;
741
742 pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
743 " for endpoint: %s Portal Tag %u\n",
744 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
745 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
746 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
747 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
748
749 spin_lock_bh(&tpg_lock);
750 list_del(&se_tpg->se_tpg_node);
751 spin_unlock_bh(&tpg_lock);
752
753 while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
754 cpu_relax();
755 /*
756 * Release any remaining demo-mode generated se_node_acl that have
757 * not been released because of TFO->tpg_check_demo_mode_cache() == 1
758 * in transport_deregister_session().
759 */
760 spin_lock_irq(&se_tpg->acl_node_lock);
761 list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
762 acl_list) {
763 list_del(&nacl->acl_list);
764 se_tpg->num_node_acls--;
765 spin_unlock_irq(&se_tpg->acl_node_lock);
766
767 core_tpg_wait_for_nacl_pr_ref(nacl);
768 core_free_device_list_for_node(nacl, se_tpg);
769 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
770
771 spin_lock_irq(&se_tpg->acl_node_lock);
772 }
773 spin_unlock_irq(&se_tpg->acl_node_lock);
774
775 if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
776 core_tpg_release_virtual_lun0(se_tpg);
777
778 se_tpg->se_tpg_fabric_ptr = NULL;
779 array_free(se_tpg->tpg_lun_list, TRANSPORT_MAX_LUNS_PER_TPG);
780 return 0;
781}
782EXPORT_SYMBOL(core_tpg_deregister);
783
784struct se_lun *core_tpg_alloc_lun(
785 struct se_portal_group *tpg,
786 u32 unpacked_lun)
787{
788 struct se_lun *lun;
789
790 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
791 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
792 "-1: %u for Target Portal Group: %u\n",
793 tpg->se_tpg_tfo->get_fabric_name(),
794 unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
795 tpg->se_tpg_tfo->tpg_get_tag(tpg));
796 return ERR_PTR(-EOVERFLOW);
797 }
798
799 spin_lock(&tpg->tpg_lun_lock);
800 lun = tpg->tpg_lun_list[unpacked_lun];
801 if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
802 pr_err("TPG Logical Unit Number: %u is already active"
803 " on %s Target Portal Group: %u, ignoring request.\n",
804 unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
805 tpg->se_tpg_tfo->tpg_get_tag(tpg));
806 spin_unlock(&tpg->tpg_lun_lock);
807 return ERR_PTR(-EINVAL);
808 }
809 spin_unlock(&tpg->tpg_lun_lock);
810
811 return lun;
812}
813
814int core_tpg_add_lun(
815 struct se_portal_group *tpg,
816 struct se_lun *lun,
817 u32 lun_access,
818 struct se_device *dev)
819{
820 int ret;
821
822 ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release);
823 if (ret < 0)
824 return ret;
825
826 ret = core_dev_export(dev, tpg, lun);
827 if (ret < 0) {
828 percpu_ref_cancel_init(&lun->lun_ref);
829 return ret;
830 }
831
832 spin_lock(&tpg->tpg_lun_lock);
833 lun->lun_access = lun_access;
834 lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
835 spin_unlock(&tpg->tpg_lun_lock);
836
837 return 0;
838}
839
840struct se_lun *core_tpg_pre_dellun(
841 struct se_portal_group *tpg,
842 u32 unpacked_lun)
843{
844 struct se_lun *lun;
845
846 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
847 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
848 "-1: %u for Target Portal Group: %u\n",
849 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
850 TRANSPORT_MAX_LUNS_PER_TPG-1,
851 tpg->se_tpg_tfo->tpg_get_tag(tpg));
852 return ERR_PTR(-EOVERFLOW);
853 }
854
855 spin_lock(&tpg->tpg_lun_lock);
856 lun = tpg->tpg_lun_list[unpacked_lun];
857 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
858 pr_err("%s Logical Unit Number: %u is not active on"
859 " Target Portal Group: %u, ignoring request.\n",
860 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
861 tpg->se_tpg_tfo->tpg_get_tag(tpg));
862 spin_unlock(&tpg->tpg_lun_lock);
863 return ERR_PTR(-ENODEV);
864 }
865 spin_unlock(&tpg->tpg_lun_lock);
866
867 return lun;
868}
869
870int core_tpg_post_dellun(
871 struct se_portal_group *tpg,
872 struct se_lun *lun)
873{
874 core_clear_lun_from_tpg(lun, tpg);
875 transport_clear_lun_ref(lun);
876
877 core_dev_unexport(lun->lun_se_dev, tpg, lun);
878
879 spin_lock(&tpg->tpg_lun_lock);
880 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
881 spin_unlock(&tpg->tpg_lun_lock);
882
883 return 0;
884}