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