target: Change TCM_NON_EXISTENT_LUN response to ASC=LOGICAL UNIT NOT SUPPORTED
[linux-2.6.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  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8  * Copyright (c) 2007-2010 Rising Tide Systems
9  * Copyright (c) 2008-2010 Linux-iSCSI.org
10  *
11  * Nicholas A. Bellinger <nab@kernel.org>
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License as published by
15  * the Free Software Foundation; either version 2 of the License, or
16  * (at your option) any later version.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  * GNU General Public License for more details.
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software
25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26  *
27  ******************************************************************************/
28
29 #include <linux/net.h>
30 #include <linux/string.h>
31 #include <linux/timer.h>
32 #include <linux/slab.h>
33 #include <linux/spinlock.h>
34 #include <linux/in.h>
35 #include <net/sock.h>
36 #include <net/tcp.h>
37 #include <scsi/scsi.h>
38 #include <scsi/scsi_cmnd.h>
39
40 #include <target/target_core_base.h>
41 #include <target/target_core_device.h>
42 #include <target/target_core_tpg.h>
43 #include <target/target_core_transport.h>
44 #include <target/target_core_fabric_ops.h>
45
46 #include "target_core_hba.h"
47 #include "target_core_stat.h"
48
49 extern struct se_device *g_lun0_dev;
50
51 static DEFINE_SPINLOCK(tpg_lock);
52 static LIST_HEAD(tpg_list);
53
54 /*      core_clear_initiator_node_from_tpg():
55  *
56  *
57  */
58 static void core_clear_initiator_node_from_tpg(
59         struct se_node_acl *nacl,
60         struct se_portal_group *tpg)
61 {
62         int i;
63         struct se_dev_entry *deve;
64         struct se_lun *lun;
65         struct se_lun_acl *acl, *acl_tmp;
66
67         spin_lock_irq(&nacl->device_list_lock);
68         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
69                 deve = &nacl->device_list[i];
70
71                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
72                         continue;
73
74                 if (!deve->se_lun) {
75                         pr_err("%s device entries device pointer is"
76                                 " NULL, but Initiator has access.\n",
77                                 tpg->se_tpg_tfo->get_fabric_name());
78                         continue;
79                 }
80
81                 lun = deve->se_lun;
82                 spin_unlock_irq(&nacl->device_list_lock);
83                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
84                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
85
86                 spin_lock(&lun->lun_acl_lock);
87                 list_for_each_entry_safe(acl, acl_tmp,
88                                         &lun->lun_acl_list, lacl_list) {
89                         if (!strcmp(acl->initiatorname, nacl->initiatorname) &&
90                             (acl->mapped_lun == deve->mapped_lun))
91                                 break;
92                 }
93
94                 if (!acl) {
95                         pr_err("Unable to locate struct se_lun_acl for %s,"
96                                 " mapped_lun: %u\n", nacl->initiatorname,
97                                 deve->mapped_lun);
98                         spin_unlock(&lun->lun_acl_lock);
99                         spin_lock_irq(&nacl->device_list_lock);
100                         continue;
101                 }
102
103                 list_del(&acl->lacl_list);
104                 spin_unlock(&lun->lun_acl_lock);
105
106                 spin_lock_irq(&nacl->device_list_lock);
107                 kfree(acl);
108         }
109         spin_unlock_irq(&nacl->device_list_lock);
110 }
111
112 /*      __core_tpg_get_initiator_node_acl():
113  *
114  *      spin_lock_bh(&tpg->acl_node_lock); must be held when calling
115  */
116 struct se_node_acl *__core_tpg_get_initiator_node_acl(
117         struct se_portal_group *tpg,
118         const char *initiatorname)
119 {
120         struct se_node_acl *acl;
121
122         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
123                 if (!strcmp(acl->initiatorname, initiatorname))
124                         return acl;
125         }
126
127         return NULL;
128 }
129
130 /*      core_tpg_get_initiator_node_acl():
131  *
132  *
133  */
134 struct se_node_acl *core_tpg_get_initiator_node_acl(
135         struct se_portal_group *tpg,
136         unsigned char *initiatorname)
137 {
138         struct se_node_acl *acl;
139
140         spin_lock_bh(&tpg->acl_node_lock);
141         list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
142                 if (!strcmp(acl->initiatorname, initiatorname) &&
143                     !acl->dynamic_node_acl) {
144                         spin_unlock_bh(&tpg->acl_node_lock);
145                         return acl;
146                 }
147         }
148         spin_unlock_bh(&tpg->acl_node_lock);
149
150         return NULL;
151 }
152
153 /*      core_tpg_add_node_to_devs():
154  *
155  *
156  */
157 void core_tpg_add_node_to_devs(
158         struct se_node_acl *acl,
159         struct se_portal_group *tpg)
160 {
161         int i = 0;
162         u32 lun_access = 0;
163         struct se_lun *lun;
164         struct se_device *dev;
165
166         spin_lock(&tpg->tpg_lun_lock);
167         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
168                 lun = &tpg->tpg_lun_list[i];
169                 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
170                         continue;
171
172                 spin_unlock(&tpg->tpg_lun_lock);
173
174                 dev = lun->lun_se_dev;
175                 /*
176                  * By default in LIO-Target $FABRIC_MOD,
177                  * demo_mode_write_protect is ON, or READ_ONLY;
178                  */
179                 if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
180                         if (dev->dev_flags & DF_READ_ONLY)
181                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
182                         else
183                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
184                 } else {
185                         /*
186                          * Allow only optical drives to issue R/W in default RO
187                          * demo mode.
188                          */
189                         if (dev->transport->get_device_type(dev) == TYPE_DISK)
190                                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
191                         else
192                                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
193                 }
194
195                 pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s"
196                         " access for LUN in Demo Mode\n",
197                         tpg->se_tpg_tfo->get_fabric_name(),
198                         tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
199                         (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ?
200                         "READ-WRITE" : "READ-ONLY");
201
202                 core_update_device_list_for_node(lun, NULL, lun->unpacked_lun,
203                                 lun_access, acl, tpg, 1);
204                 spin_lock(&tpg->tpg_lun_lock);
205         }
206         spin_unlock(&tpg->tpg_lun_lock);
207 }
208
209 /*      core_set_queue_depth_for_node():
210  *
211  *
212  */
213 static int core_set_queue_depth_for_node(
214         struct se_portal_group *tpg,
215         struct se_node_acl *acl)
216 {
217         if (!acl->queue_depth) {
218                 pr_err("Queue depth for %s Initiator Node: %s is 0,"
219                         "defaulting to 1.\n", tpg->se_tpg_tfo->get_fabric_name(),
220                         acl->initiatorname);
221                 acl->queue_depth = 1;
222         }
223
224         return 0;
225 }
226
227 /*      core_create_device_list_for_node():
228  *
229  *
230  */
231 static int core_create_device_list_for_node(struct se_node_acl *nacl)
232 {
233         struct se_dev_entry *deve;
234         int i;
235
236         nacl->device_list = kzalloc(sizeof(struct se_dev_entry) *
237                                 TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL);
238         if (!nacl->device_list) {
239                 pr_err("Unable to allocate memory for"
240                         " struct se_node_acl->device_list\n");
241                 return -ENOMEM;
242         }
243         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
244                 deve = &nacl->device_list[i];
245
246                 atomic_set(&deve->ua_count, 0);
247                 atomic_set(&deve->pr_ref_count, 0);
248                 spin_lock_init(&deve->ua_lock);
249                 INIT_LIST_HEAD(&deve->alua_port_list);
250                 INIT_LIST_HEAD(&deve->ua_list);
251         }
252
253         return 0;
254 }
255
256 /*      core_tpg_check_initiator_node_acl()
257  *
258  *
259  */
260 struct se_node_acl *core_tpg_check_initiator_node_acl(
261         struct se_portal_group *tpg,
262         unsigned char *initiatorname)
263 {
264         struct se_node_acl *acl;
265
266         acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
267         if (acl)
268                 return acl;
269
270         if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
271                 return NULL;
272
273         acl =  tpg->se_tpg_tfo->tpg_alloc_fabric_acl(tpg);
274         if (!acl)
275                 return NULL;
276
277         INIT_LIST_HEAD(&acl->acl_list);
278         INIT_LIST_HEAD(&acl->acl_sess_list);
279         spin_lock_init(&acl->device_list_lock);
280         spin_lock_init(&acl->nacl_sess_lock);
281         atomic_set(&acl->acl_pr_ref_count, 0);
282         acl->queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
283         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
284         acl->se_tpg = tpg;
285         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
286         spin_lock_init(&acl->stats_lock);
287         acl->dynamic_node_acl = 1;
288
289         tpg->se_tpg_tfo->set_default_node_attributes(acl);
290
291         if (core_create_device_list_for_node(acl) < 0) {
292                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
293                 return NULL;
294         }
295
296         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
297                 core_free_device_list_for_node(acl, tpg);
298                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
299                 return NULL;
300         }
301
302         core_tpg_add_node_to_devs(acl, tpg);
303
304         spin_lock_bh(&tpg->acl_node_lock);
305         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
306         tpg->num_node_acls++;
307         spin_unlock_bh(&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 }
316 EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
317
318 void 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
324 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
325 {
326         int i, ret;
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                 ret = core_dev_del_lun(tpg, lun->unpacked_lun);
339                 spin_lock(&tpg->tpg_lun_lock);
340         }
341         spin_unlock(&tpg->tpg_lun_lock);
342 }
343 EXPORT_SYMBOL(core_tpg_clear_object_luns);
344
345 /*      core_tpg_add_initiator_node_acl():
346  *
347  *
348  */
349 struct 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_bh(&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_bh(&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_bh(&tpg->acl_node_lock);
382                 return ERR_PTR(-EEXIST);
383         }
384         spin_unlock_bh(&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         spin_lock_init(&acl->device_list_lock);
400         spin_lock_init(&acl->nacl_sess_lock);
401         atomic_set(&acl->acl_pr_ref_count, 0);
402         acl->queue_depth = queue_depth;
403         snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
404         acl->se_tpg = tpg;
405         acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
406         spin_lock_init(&acl->stats_lock);
407
408         tpg->se_tpg_tfo->set_default_node_attributes(acl);
409
410         if (core_create_device_list_for_node(acl) < 0) {
411                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
412                 return ERR_PTR(-ENOMEM);
413         }
414
415         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
416                 core_free_device_list_for_node(acl, tpg);
417                 tpg->se_tpg_tfo->tpg_release_fabric_acl(tpg, acl);
418                 return ERR_PTR(-EINVAL);
419         }
420
421         spin_lock_bh(&tpg->acl_node_lock);
422         list_add_tail(&acl->acl_list, &tpg->acl_node_list);
423         tpg->num_node_acls++;
424         spin_unlock_bh(&tpg->acl_node_lock);
425
426 done:
427         pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
428                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
429                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
430                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
431
432         return acl;
433 }
434 EXPORT_SYMBOL(core_tpg_add_initiator_node_acl);
435
436 /*      core_tpg_del_initiator_node_acl():
437  *
438  *
439  */
440 int core_tpg_del_initiator_node_acl(
441         struct se_portal_group *tpg,
442         struct se_node_acl *acl,
443         int force)
444 {
445         struct se_session *sess, *sess_tmp;
446         int dynamic_acl = 0;
447
448         spin_lock_bh(&tpg->acl_node_lock);
449         if (acl->dynamic_node_acl) {
450                 acl->dynamic_node_acl = 0;
451                 dynamic_acl = 1;
452         }
453         list_del(&acl->acl_list);
454         tpg->num_node_acls--;
455         spin_unlock_bh(&tpg->acl_node_lock);
456
457         spin_lock_bh(&tpg->session_lock);
458         list_for_each_entry_safe(sess, sess_tmp,
459                                 &tpg->tpg_sess_list, sess_list) {
460                 if (sess->se_node_acl != acl)
461                         continue;
462                 /*
463                  * Determine if the session needs to be closed by our context.
464                  */
465                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
466                         continue;
467
468                 spin_unlock_bh(&tpg->session_lock);
469                 /*
470                  * If the $FABRIC_MOD session for the Initiator Node ACL exists,
471                  * forcefully shutdown the $FABRIC_MOD session/nexus.
472                  */
473                 tpg->se_tpg_tfo->close_session(sess);
474
475                 spin_lock_bh(&tpg->session_lock);
476         }
477         spin_unlock_bh(&tpg->session_lock);
478
479         core_tpg_wait_for_nacl_pr_ref(acl);
480         core_clear_initiator_node_from_tpg(acl, tpg);
481         core_free_device_list_for_node(acl, tpg);
482
483         pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
484                 " Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
485                 tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
486                 tpg->se_tpg_tfo->get_fabric_name(), acl->initiatorname);
487
488         return 0;
489 }
490 EXPORT_SYMBOL(core_tpg_del_initiator_node_acl);
491
492 /*      core_tpg_set_initiator_node_queue_depth():
493  *
494  *
495  */
496 int core_tpg_set_initiator_node_queue_depth(
497         struct se_portal_group *tpg,
498         unsigned char *initiatorname,
499         u32 queue_depth,
500         int force)
501 {
502         struct se_session *sess, *init_sess = NULL;
503         struct se_node_acl *acl;
504         int dynamic_acl = 0;
505
506         spin_lock_bh(&tpg->acl_node_lock);
507         acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
508         if (!acl) {
509                 pr_err("Access Control List entry for %s Initiator"
510                         " Node %s does not exists for TPG %hu, ignoring"
511                         " request.\n", tpg->se_tpg_tfo->get_fabric_name(),
512                         initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
513                 spin_unlock_bh(&tpg->acl_node_lock);
514                 return -ENODEV;
515         }
516         if (acl->dynamic_node_acl) {
517                 acl->dynamic_node_acl = 0;
518                 dynamic_acl = 1;
519         }
520         spin_unlock_bh(&tpg->acl_node_lock);
521
522         spin_lock_bh(&tpg->session_lock);
523         list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
524                 if (sess->se_node_acl != acl)
525                         continue;
526
527                 if (!force) {
528                         pr_err("Unable to change queue depth for %s"
529                                 " Initiator Node: %s while session is"
530                                 " operational.  To forcefully change the queue"
531                                 " depth and force session reinstatement"
532                                 " use the \"force=1\" parameter.\n",
533                                 tpg->se_tpg_tfo->get_fabric_name(), initiatorname);
534                         spin_unlock_bh(&tpg->session_lock);
535
536                         spin_lock_bh(&tpg->acl_node_lock);
537                         if (dynamic_acl)
538                                 acl->dynamic_node_acl = 1;
539                         spin_unlock_bh(&tpg->acl_node_lock);
540                         return -EEXIST;
541                 }
542                 /*
543                  * Determine if the session needs to be closed by our context.
544                  */
545                 if (!tpg->se_tpg_tfo->shutdown_session(sess))
546                         continue;
547
548                 init_sess = sess;
549                 break;
550         }
551
552         /*
553          * User has requested to change the queue depth for a Initiator Node.
554          * Change the value in the Node's struct se_node_acl, and call
555          * core_set_queue_depth_for_node() to add the requested queue depth.
556          *
557          * Finally call  tpg->se_tpg_tfo->close_session() to force session
558          * reinstatement to occur if there is an active session for the
559          * $FABRIC_MOD Initiator Node in question.
560          */
561         acl->queue_depth = queue_depth;
562
563         if (core_set_queue_depth_for_node(tpg, acl) < 0) {
564                 spin_unlock_bh(&tpg->session_lock);
565                 /*
566                  * Force session reinstatement if
567                  * core_set_queue_depth_for_node() failed, because we assume
568                  * the $FABRIC_MOD has already the set session reinstatement
569                  * bit from tpg->se_tpg_tfo->shutdown_session() called above.
570                  */
571                 if (init_sess)
572                         tpg->se_tpg_tfo->close_session(init_sess);
573
574                 spin_lock_bh(&tpg->acl_node_lock);
575                 if (dynamic_acl)
576                         acl->dynamic_node_acl = 1;
577                 spin_unlock_bh(&tpg->acl_node_lock);
578                 return -EINVAL;
579         }
580         spin_unlock_bh(&tpg->session_lock);
581         /*
582          * If the $FABRIC_MOD session for the Initiator Node ACL exists,
583          * forcefully shutdown the $FABRIC_MOD session/nexus.
584          */
585         if (init_sess)
586                 tpg->se_tpg_tfo->close_session(init_sess);
587
588         pr_debug("Successfuly changed queue depth to: %d for Initiator"
589                 " Node: %s on %s Target Portal Group: %u\n", queue_depth,
590                 initiatorname, tpg->se_tpg_tfo->get_fabric_name(),
591                 tpg->se_tpg_tfo->tpg_get_tag(tpg));
592
593         spin_lock_bh(&tpg->acl_node_lock);
594         if (dynamic_acl)
595                 acl->dynamic_node_acl = 1;
596         spin_unlock_bh(&tpg->acl_node_lock);
597
598         return 0;
599 }
600 EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
601
602 static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg)
603 {
604         /* Set in core_dev_setup_virtual_lun0() */
605         struct se_device *dev = g_lun0_dev;
606         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
607         u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
608         int ret;
609
610         lun->unpacked_lun = 0;
611         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
612         atomic_set(&lun->lun_acl_count, 0);
613         init_completion(&lun->lun_shutdown_comp);
614         INIT_LIST_HEAD(&lun->lun_acl_list);
615         INIT_LIST_HEAD(&lun->lun_cmd_list);
616         spin_lock_init(&lun->lun_acl_lock);
617         spin_lock_init(&lun->lun_cmd_lock);
618         spin_lock_init(&lun->lun_sep_lock);
619
620         ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev);
621         if (ret < 0)
622                 return ret;
623
624         return 0;
625 }
626
627 static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg)
628 {
629         struct se_lun *lun = &se_tpg->tpg_virt_lun0;
630
631         core_tpg_post_dellun(se_tpg, lun);
632 }
633
634 int core_tpg_register(
635         struct target_core_fabric_ops *tfo,
636         struct se_wwn *se_wwn,
637         struct se_portal_group *se_tpg,
638         void *tpg_fabric_ptr,
639         int se_tpg_type)
640 {
641         struct se_lun *lun;
642         u32 i;
643
644         se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) *
645                                 TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL);
646         if (!se_tpg->tpg_lun_list) {
647                 pr_err("Unable to allocate struct se_portal_group->"
648                                 "tpg_lun_list\n");
649                 return -ENOMEM;
650         }
651
652         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
653                 lun = &se_tpg->tpg_lun_list[i];
654                 lun->unpacked_lun = i;
655                 lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
656                 atomic_set(&lun->lun_acl_count, 0);
657                 init_completion(&lun->lun_shutdown_comp);
658                 INIT_LIST_HEAD(&lun->lun_acl_list);
659                 INIT_LIST_HEAD(&lun->lun_cmd_list);
660                 spin_lock_init(&lun->lun_acl_lock);
661                 spin_lock_init(&lun->lun_cmd_lock);
662                 spin_lock_init(&lun->lun_sep_lock);
663         }
664
665         se_tpg->se_tpg_type = se_tpg_type;
666         se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr;
667         se_tpg->se_tpg_tfo = tfo;
668         se_tpg->se_tpg_wwn = se_wwn;
669         atomic_set(&se_tpg->tpg_pr_ref_count, 0);
670         INIT_LIST_HEAD(&se_tpg->acl_node_list);
671         INIT_LIST_HEAD(&se_tpg->se_tpg_node);
672         INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
673         spin_lock_init(&se_tpg->acl_node_lock);
674         spin_lock_init(&se_tpg->session_lock);
675         spin_lock_init(&se_tpg->tpg_lun_lock);
676
677         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) {
678                 if (core_tpg_setup_virtual_lun0(se_tpg) < 0) {
679                         kfree(se_tpg);
680                         return -ENOMEM;
681                 }
682         }
683
684         spin_lock_bh(&tpg_lock);
685         list_add_tail(&se_tpg->se_tpg_node, &tpg_list);
686         spin_unlock_bh(&tpg_lock);
687
688         pr_debug("TARGET_CORE[%s]: Allocated %s struct se_portal_group for"
689                 " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(),
690                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
691                 "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ?
692                 "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg));
693
694         return 0;
695 }
696 EXPORT_SYMBOL(core_tpg_register);
697
698 int core_tpg_deregister(struct se_portal_group *se_tpg)
699 {
700         struct se_node_acl *nacl, *nacl_tmp;
701
702         pr_debug("TARGET_CORE[%s]: Deallocating %s struct se_portal_group"
703                 " for endpoint: %s Portal Tag %u\n",
704                 (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ?
705                 "Normal" : "Discovery", se_tpg->se_tpg_tfo->get_fabric_name(),
706                 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
707                 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
708
709         spin_lock_bh(&tpg_lock);
710         list_del(&se_tpg->se_tpg_node);
711         spin_unlock_bh(&tpg_lock);
712
713         while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
714                 cpu_relax();
715         /*
716          * Release any remaining demo-mode generated se_node_acl that have
717          * not been released because of TFO->tpg_check_demo_mode_cache() == 1
718          * in transport_deregister_session().
719          */
720         spin_lock_bh(&se_tpg->acl_node_lock);
721         list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,
722                         acl_list) {
723                 list_del(&nacl->acl_list);
724                 se_tpg->num_node_acls--;
725                 spin_unlock_bh(&se_tpg->acl_node_lock);
726
727                 core_tpg_wait_for_nacl_pr_ref(nacl);
728                 core_free_device_list_for_node(nacl, se_tpg);
729                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);
730
731                 spin_lock_bh(&se_tpg->acl_node_lock);
732         }
733         spin_unlock_bh(&se_tpg->acl_node_lock);
734
735         if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)
736                 core_tpg_release_virtual_lun0(se_tpg);
737
738         se_tpg->se_tpg_fabric_ptr = NULL;
739         kfree(se_tpg->tpg_lun_list);
740         return 0;
741 }
742 EXPORT_SYMBOL(core_tpg_deregister);
743
744 struct se_lun *core_tpg_pre_addlun(
745         struct se_portal_group *tpg,
746         u32 unpacked_lun)
747 {
748         struct se_lun *lun;
749
750         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
751                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
752                         "-1: %u for Target Portal Group: %u\n",
753                         tpg->se_tpg_tfo->get_fabric_name(),
754                         unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1,
755                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
756                 return ERR_PTR(-EOVERFLOW);
757         }
758
759         spin_lock(&tpg->tpg_lun_lock);
760         lun = &tpg->tpg_lun_list[unpacked_lun];
761         if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) {
762                 pr_err("TPG Logical Unit Number: %u is already active"
763                         " on %s Target Portal Group: %u, ignoring request.\n",
764                         unpacked_lun, tpg->se_tpg_tfo->get_fabric_name(),
765                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
766                 spin_unlock(&tpg->tpg_lun_lock);
767                 return ERR_PTR(-EINVAL);
768         }
769         spin_unlock(&tpg->tpg_lun_lock);
770
771         return lun;
772 }
773
774 int core_tpg_post_addlun(
775         struct se_portal_group *tpg,
776         struct se_lun *lun,
777         u32 lun_access,
778         void *lun_ptr)
779 {
780         int ret;
781
782         ret = core_dev_export(lun_ptr, tpg, lun);
783         if (ret < 0)
784                 return ret;
785
786         spin_lock(&tpg->tpg_lun_lock);
787         lun->lun_access = lun_access;
788         lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE;
789         spin_unlock(&tpg->tpg_lun_lock);
790
791         return 0;
792 }
793
794 static void core_tpg_shutdown_lun(
795         struct se_portal_group *tpg,
796         struct se_lun *lun)
797 {
798         core_clear_lun_from_tpg(lun, tpg);
799         transport_clear_lun_from_sessions(lun);
800 }
801
802 struct se_lun *core_tpg_pre_dellun(
803         struct se_portal_group *tpg,
804         u32 unpacked_lun,
805         int *ret)
806 {
807         struct se_lun *lun;
808
809         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
810                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG"
811                         "-1: %u for Target Portal Group: %u\n",
812                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
813                         TRANSPORT_MAX_LUNS_PER_TPG-1,
814                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
815                 return ERR_PTR(-EOVERFLOW);
816         }
817
818         spin_lock(&tpg->tpg_lun_lock);
819         lun = &tpg->tpg_lun_list[unpacked_lun];
820         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
821                 pr_err("%s Logical Unit Number: %u is not active on"
822                         " Target Portal Group: %u, ignoring request.\n",
823                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
824                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
825                 spin_unlock(&tpg->tpg_lun_lock);
826                 return ERR_PTR(-ENODEV);
827         }
828         spin_unlock(&tpg->tpg_lun_lock);
829
830         return lun;
831 }
832
833 int core_tpg_post_dellun(
834         struct se_portal_group *tpg,
835         struct se_lun *lun)
836 {
837         core_tpg_shutdown_lun(tpg, lun);
838
839         core_dev_unexport(lun->lun_se_dev, tpg, lun);
840
841         spin_lock(&tpg->tpg_lun_lock);
842         lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
843         spin_unlock(&tpg->tpg_lun_lock);
844
845         return 0;
846 }