target: Fix virtual LUN=0 target_configure_device failure OOPs
[firefly-linux-kernel-4.4.55.git] / drivers / target / target_core_device.c
1 /*******************************************************************************
2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
3  *
4  * This file contains the TCM Virtual Device and Disk Transport
5  * agnostic related functions.
6  *
7  * (c) Copyright 2003-2013 Datera, Inc.
8  *
9  * Nicholas A. Bellinger <nab@kernel.org>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24  *
25  ******************************************************************************/
26
27 #include <linux/net.h>
28 #include <linux/string.h>
29 #include <linux/delay.h>
30 #include <linux/timer.h>
31 #include <linux/slab.h>
32 #include <linux/spinlock.h>
33 #include <linux/kthread.h>
34 #include <linux/in.h>
35 #include <linux/export.h>
36 #include <net/sock.h>
37 #include <net/tcp.h>
38 #include <scsi/scsi.h>
39 #include <scsi/scsi_device.h>
40
41 #include <target/target_core_base.h>
42 #include <target/target_core_backend.h>
43 #include <target/target_core_fabric.h>
44
45 #include "target_core_internal.h"
46 #include "target_core_alua.h"
47 #include "target_core_pr.h"
48 #include "target_core_ua.h"
49
50 DEFINE_MUTEX(g_device_mutex);
51 LIST_HEAD(g_device_list);
52
53 static struct se_hba *lun0_hba;
54 /* not static, needed by tpg.c */
55 struct se_device *g_lun0_dev;
56
57 sense_reason_t
58 transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
59 {
60         struct se_lun *se_lun = NULL;
61         struct se_session *se_sess = se_cmd->se_sess;
62         struct se_device *dev;
63         unsigned long flags;
64
65         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
66                 return TCM_NON_EXISTENT_LUN;
67
68         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
69         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
70         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
71                 struct se_dev_entry *deve = se_cmd->se_deve;
72
73                 deve->total_cmds++;
74
75                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
76                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
77                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
78                                 " Access for 0x%08x\n",
79                                 se_cmd->se_tfo->get_fabric_name(),
80                                 unpacked_lun);
81                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
82                         return TCM_WRITE_PROTECTED;
83                 }
84
85                 if (se_cmd->data_direction == DMA_TO_DEVICE)
86                         deve->write_bytes += se_cmd->data_length;
87                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
88                         deve->read_bytes += se_cmd->data_length;
89
90                 se_lun = deve->se_lun;
91                 se_cmd->se_lun = deve->se_lun;
92                 se_cmd->pr_res_key = deve->pr_res_key;
93                 se_cmd->orig_fe_lun = unpacked_lun;
94                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
95
96                 percpu_ref_get(&se_lun->lun_ref);
97                 se_cmd->lun_ref_active = true;
98         }
99         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
100
101         if (!se_lun) {
102                 /*
103                  * Use the se_portal_group->tpg_virt_lun0 to allow for
104                  * REPORT_LUNS, et al to be returned when no active
105                  * MappedLUN=0 exists for this Initiator Port.
106                  */
107                 if (unpacked_lun != 0) {
108                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
109                                 " Access for 0x%08x\n",
110                                 se_cmd->se_tfo->get_fabric_name(),
111                                 unpacked_lun);
112                         return TCM_NON_EXISTENT_LUN;
113                 }
114                 /*
115                  * Force WRITE PROTECT for virtual LUN 0
116                  */
117                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
118                     (se_cmd->data_direction != DMA_NONE))
119                         return TCM_WRITE_PROTECTED;
120
121                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
122                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
123                 se_cmd->orig_fe_lun = 0;
124                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
125
126                 percpu_ref_get(&se_lun->lun_ref);
127                 se_cmd->lun_ref_active = true;
128         }
129
130         /* Directly associate cmd with se_dev */
131         se_cmd->se_dev = se_lun->lun_se_dev;
132
133         dev = se_lun->lun_se_dev;
134         atomic_long_inc(&dev->num_cmds);
135         if (se_cmd->data_direction == DMA_TO_DEVICE)
136                 atomic_long_add(se_cmd->data_length, &dev->write_bytes);
137         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
138                 atomic_long_add(se_cmd->data_length, &dev->read_bytes);
139
140         return 0;
141 }
142 EXPORT_SYMBOL(transport_lookup_cmd_lun);
143
144 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
145 {
146         struct se_dev_entry *deve;
147         struct se_lun *se_lun = NULL;
148         struct se_session *se_sess = se_cmd->se_sess;
149         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
150         unsigned long flags;
151
152         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
153                 return -ENODEV;
154
155         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
156         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
157         deve = se_cmd->se_deve;
158
159         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
160                 se_tmr->tmr_lun = deve->se_lun;
161                 se_cmd->se_lun = deve->se_lun;
162                 se_lun = deve->se_lun;
163                 se_cmd->pr_res_key = deve->pr_res_key;
164                 se_cmd->orig_fe_lun = unpacked_lun;
165         }
166         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
167
168         if (!se_lun) {
169                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
170                         " Access for 0x%08x\n",
171                         se_cmd->se_tfo->get_fabric_name(),
172                         unpacked_lun);
173                 return -ENODEV;
174         }
175
176         /* Directly associate cmd with se_dev */
177         se_cmd->se_dev = se_lun->lun_se_dev;
178         se_tmr->tmr_dev = se_lun->lun_se_dev;
179
180         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
181         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
182         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
183
184         return 0;
185 }
186 EXPORT_SYMBOL(transport_lookup_tmr_lun);
187
188 /*
189  * This function is called from core_scsi3_emulate_pro_register_and_move()
190  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
191  * when a matching rtpi is found.
192  */
193 struct se_dev_entry *core_get_se_deve_from_rtpi(
194         struct se_node_acl *nacl,
195         u16 rtpi)
196 {
197         struct se_dev_entry *deve;
198         struct se_lun *lun;
199         struct se_port *port;
200         struct se_portal_group *tpg = nacl->se_tpg;
201         u32 i;
202
203         spin_lock_irq(&nacl->device_list_lock);
204         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
205                 deve = nacl->device_list[i];
206
207                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
208                         continue;
209
210                 lun = deve->se_lun;
211                 if (!lun) {
212                         pr_err("%s device entries device pointer is"
213                                 " NULL, but Initiator has access.\n",
214                                 tpg->se_tpg_tfo->get_fabric_name());
215                         continue;
216                 }
217                 port = lun->lun_sep;
218                 if (!port) {
219                         pr_err("%s device entries device pointer is"
220                                 " NULL, but Initiator has access.\n",
221                                 tpg->se_tpg_tfo->get_fabric_name());
222                         continue;
223                 }
224                 if (port->sep_rtpi != rtpi)
225                         continue;
226
227                 atomic_inc_mb(&deve->pr_ref_count);
228                 spin_unlock_irq(&nacl->device_list_lock);
229
230                 return deve;
231         }
232         spin_unlock_irq(&nacl->device_list_lock);
233
234         return NULL;
235 }
236
237 int core_free_device_list_for_node(
238         struct se_node_acl *nacl,
239         struct se_portal_group *tpg)
240 {
241         struct se_dev_entry *deve;
242         struct se_lun *lun;
243         u32 i;
244
245         if (!nacl->device_list)
246                 return 0;
247
248         spin_lock_irq(&nacl->device_list_lock);
249         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
250                 deve = nacl->device_list[i];
251
252                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
253                         continue;
254
255                 if (!deve->se_lun) {
256                         pr_err("%s device entries device pointer is"
257                                 " NULL, but Initiator has access.\n",
258                                 tpg->se_tpg_tfo->get_fabric_name());
259                         continue;
260                 }
261                 lun = deve->se_lun;
262
263                 spin_unlock_irq(&nacl->device_list_lock);
264                 core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
265                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
266                 spin_lock_irq(&nacl->device_list_lock);
267         }
268         spin_unlock_irq(&nacl->device_list_lock);
269
270         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
271         nacl->device_list = NULL;
272
273         return 0;
274 }
275
276 void core_update_device_list_access(
277         u32 mapped_lun,
278         u32 lun_access,
279         struct se_node_acl *nacl)
280 {
281         struct se_dev_entry *deve;
282
283         spin_lock_irq(&nacl->device_list_lock);
284         deve = nacl->device_list[mapped_lun];
285         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
286                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
287                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
288         } else {
289                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
290                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
291         }
292         spin_unlock_irq(&nacl->device_list_lock);
293 }
294
295 /*      core_enable_device_list_for_node():
296  *
297  *
298  */
299 int core_enable_device_list_for_node(
300         struct se_lun *lun,
301         struct se_lun_acl *lun_acl,
302         u32 mapped_lun,
303         u32 lun_access,
304         struct se_node_acl *nacl,
305         struct se_portal_group *tpg)
306 {
307         struct se_port *port = lun->lun_sep;
308         struct se_dev_entry *deve;
309
310         spin_lock_irq(&nacl->device_list_lock);
311
312         deve = nacl->device_list[mapped_lun];
313
314         /*
315          * Check if the call is handling demo mode -> explicit LUN ACL
316          * transition.  This transition must be for the same struct se_lun
317          * + mapped_lun that was setup in demo mode..
318          */
319         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
320                 if (deve->se_lun_acl != NULL) {
321                         pr_err("struct se_dev_entry->se_lun_acl"
322                                " already set for demo mode -> explicit"
323                                " LUN ACL transition\n");
324                         spin_unlock_irq(&nacl->device_list_lock);
325                         return -EINVAL;
326                 }
327                 if (deve->se_lun != lun) {
328                         pr_err("struct se_dev_entry->se_lun does"
329                                " match passed struct se_lun for demo mode"
330                                " -> explicit LUN ACL transition\n");
331                         spin_unlock_irq(&nacl->device_list_lock);
332                         return -EINVAL;
333                 }
334                 deve->se_lun_acl = lun_acl;
335
336                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
337                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
338                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
339                 } else {
340                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
341                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
342                 }
343
344                 spin_unlock_irq(&nacl->device_list_lock);
345                 return 0;
346         }
347
348         deve->se_lun = lun;
349         deve->se_lun_acl = lun_acl;
350         deve->mapped_lun = mapped_lun;
351         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
352
353         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
354                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
355                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
356         } else {
357                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
358                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
359         }
360
361         deve->creation_time = get_jiffies_64();
362         deve->attach_count++;
363         spin_unlock_irq(&nacl->device_list_lock);
364
365         spin_lock_bh(&port->sep_alua_lock);
366         list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
367         spin_unlock_bh(&port->sep_alua_lock);
368
369         return 0;
370 }
371
372 /*      core_disable_device_list_for_node():
373  *
374  *
375  */
376 int core_disable_device_list_for_node(
377         struct se_lun *lun,
378         struct se_lun_acl *lun_acl,
379         u32 mapped_lun,
380         u32 lun_access,
381         struct se_node_acl *nacl,
382         struct se_portal_group *tpg)
383 {
384         struct se_port *port = lun->lun_sep;
385         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
386
387         /*
388          * If the MappedLUN entry is being disabled, the entry in
389          * port->sep_alua_list must be removed now before clearing the
390          * struct se_dev_entry pointers below as logic in
391          * core_alua_do_transition_tg_pt() depends on these being present.
392          *
393          * deve->se_lun_acl will be NULL for demo-mode created LUNs
394          * that have not been explicitly converted to MappedLUNs ->
395          * struct se_lun_acl, but we remove deve->alua_port_list from
396          * port->sep_alua_list. This also means that active UAs and
397          * NodeACL context specific PR metadata for demo-mode
398          * MappedLUN *deve will be released below..
399          */
400         spin_lock_bh(&port->sep_alua_lock);
401         list_del(&deve->alua_port_list);
402         spin_unlock_bh(&port->sep_alua_lock);
403         /*
404          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
405          * PR operation to complete.
406          */
407         while (atomic_read(&deve->pr_ref_count) != 0)
408                 cpu_relax();
409
410         spin_lock_irq(&nacl->device_list_lock);
411         /*
412          * Disable struct se_dev_entry LUN ACL mapping
413          */
414         core_scsi3_ua_release_all(deve);
415         deve->se_lun = NULL;
416         deve->se_lun_acl = NULL;
417         deve->lun_flags = 0;
418         deve->creation_time = 0;
419         deve->attach_count--;
420         spin_unlock_irq(&nacl->device_list_lock);
421
422         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
423         return 0;
424 }
425
426 /*      core_clear_lun_from_tpg():
427  *
428  *
429  */
430 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
431 {
432         struct se_node_acl *nacl;
433         struct se_dev_entry *deve;
434         u32 i;
435
436         spin_lock_irq(&tpg->acl_node_lock);
437         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
438                 spin_unlock_irq(&tpg->acl_node_lock);
439
440                 spin_lock_irq(&nacl->device_list_lock);
441                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
442                         deve = nacl->device_list[i];
443                         if (lun != deve->se_lun)
444                                 continue;
445                         spin_unlock_irq(&nacl->device_list_lock);
446
447                         core_disable_device_list_for_node(lun, NULL,
448                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
449                                 nacl, tpg);
450
451                         spin_lock_irq(&nacl->device_list_lock);
452                 }
453                 spin_unlock_irq(&nacl->device_list_lock);
454
455                 spin_lock_irq(&tpg->acl_node_lock);
456         }
457         spin_unlock_irq(&tpg->acl_node_lock);
458 }
459
460 static struct se_port *core_alloc_port(struct se_device *dev)
461 {
462         struct se_port *port, *port_tmp;
463
464         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
465         if (!port) {
466                 pr_err("Unable to allocate struct se_port\n");
467                 return ERR_PTR(-ENOMEM);
468         }
469         INIT_LIST_HEAD(&port->sep_alua_list);
470         INIT_LIST_HEAD(&port->sep_list);
471         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
472         spin_lock_init(&port->sep_alua_lock);
473         mutex_init(&port->sep_tg_pt_md_mutex);
474
475         spin_lock(&dev->se_port_lock);
476         if (dev->dev_port_count == 0x0000ffff) {
477                 pr_warn("Reached dev->dev_port_count =="
478                                 " 0x0000ffff\n");
479                 spin_unlock(&dev->se_port_lock);
480                 return ERR_PTR(-ENOSPC);
481         }
482 again:
483         /*
484          * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
485          * Here is the table from spc4r17 section 7.7.3.8.
486          *
487          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
488          *
489          * Code      Description
490          * 0h        Reserved
491          * 1h        Relative port 1, historically known as port A
492          * 2h        Relative port 2, historically known as port B
493          * 3h to FFFFh    Relative port 3 through 65 535
494          */
495         port->sep_rtpi = dev->dev_rpti_counter++;
496         if (!port->sep_rtpi)
497                 goto again;
498
499         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
500                 /*
501                  * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
502                  * for 16-bit wrap..
503                  */
504                 if (port->sep_rtpi == port_tmp->sep_rtpi)
505                         goto again;
506         }
507         spin_unlock(&dev->se_port_lock);
508
509         return port;
510 }
511
512 static void core_export_port(
513         struct se_device *dev,
514         struct se_portal_group *tpg,
515         struct se_port *port,
516         struct se_lun *lun)
517 {
518         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
519
520         spin_lock(&dev->se_port_lock);
521         spin_lock(&lun->lun_sep_lock);
522         port->sep_tpg = tpg;
523         port->sep_lun = lun;
524         lun->lun_sep = port;
525         spin_unlock(&lun->lun_sep_lock);
526
527         list_add_tail(&port->sep_list, &dev->dev_sep_list);
528         spin_unlock(&dev->se_port_lock);
529
530         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
531             !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
532                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
533                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
534                         pr_err("Unable to allocate t10_alua_tg_pt"
535                                         "_gp_member_t\n");
536                         return;
537                 }
538                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
539                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
540                         dev->t10_alua.default_tg_pt_gp);
541                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
542                 pr_debug("%s/%s: Adding to default ALUA Target Port"
543                         " Group: alua/default_tg_pt_gp\n",
544                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
545         }
546
547         dev->dev_port_count++;
548         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
549 }
550
551 /*
552  *      Called with struct se_device->se_port_lock spinlock held.
553  */
554 static void core_release_port(struct se_device *dev, struct se_port *port)
555         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
556 {
557         /*
558          * Wait for any port reference for PR ALL_TG_PT=1 operation
559          * to complete in __core_scsi3_alloc_registration()
560          */
561         spin_unlock(&dev->se_port_lock);
562         if (atomic_read(&port->sep_tg_pt_ref_cnt))
563                 cpu_relax();
564         spin_lock(&dev->se_port_lock);
565
566         core_alua_free_tg_pt_gp_mem(port);
567
568         list_del(&port->sep_list);
569         dev->dev_port_count--;
570         kfree(port);
571 }
572
573 int core_dev_export(
574         struct se_device *dev,
575         struct se_portal_group *tpg,
576         struct se_lun *lun)
577 {
578         struct se_hba *hba = dev->se_hba;
579         struct se_port *port;
580
581         port = core_alloc_port(dev);
582         if (IS_ERR(port))
583                 return PTR_ERR(port);
584
585         lun->lun_se_dev = dev;
586
587         spin_lock(&hba->device_lock);
588         dev->export_count++;
589         spin_unlock(&hba->device_lock);
590
591         core_export_port(dev, tpg, port, lun);
592         return 0;
593 }
594
595 void core_dev_unexport(
596         struct se_device *dev,
597         struct se_portal_group *tpg,
598         struct se_lun *lun)
599 {
600         struct se_hba *hba = dev->se_hba;
601         struct se_port *port = lun->lun_sep;
602
603         spin_lock(&lun->lun_sep_lock);
604         if (lun->lun_se_dev == NULL) {
605                 spin_unlock(&lun->lun_sep_lock);
606                 return;
607         }
608         spin_unlock(&lun->lun_sep_lock);
609
610         spin_lock(&dev->se_port_lock);
611         core_release_port(dev, port);
612         spin_unlock(&dev->se_port_lock);
613
614         spin_lock(&hba->device_lock);
615         dev->export_count--;
616         spin_unlock(&hba->device_lock);
617
618         lun->lun_sep = NULL;
619         lun->lun_se_dev = NULL;
620 }
621
622 static void se_release_vpd_for_dev(struct se_device *dev)
623 {
624         struct t10_vpd *vpd, *vpd_tmp;
625
626         spin_lock(&dev->t10_wwn.t10_vpd_lock);
627         list_for_each_entry_safe(vpd, vpd_tmp,
628                         &dev->t10_wwn.t10_vpd_list, vpd_list) {
629                 list_del(&vpd->vpd_list);
630                 kfree(vpd);
631         }
632         spin_unlock(&dev->t10_wwn.t10_vpd_lock);
633 }
634
635 static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
636 {
637         u32 aligned_max_sectors;
638         u32 alignment;
639         /*
640          * Limit max_sectors to a PAGE_SIZE aligned value for modern
641          * transport_allocate_data_tasks() operation.
642          */
643         alignment = max(1ul, PAGE_SIZE / block_size);
644         aligned_max_sectors = rounddown(max_sectors, alignment);
645
646         if (max_sectors != aligned_max_sectors)
647                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
648                         max_sectors, aligned_max_sectors);
649
650         return aligned_max_sectors;
651 }
652
653 int se_dev_set_max_unmap_lba_count(
654         struct se_device *dev,
655         u32 max_unmap_lba_count)
656 {
657         dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
658         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
659                         dev, dev->dev_attrib.max_unmap_lba_count);
660         return 0;
661 }
662 EXPORT_SYMBOL(se_dev_set_max_unmap_lba_count);
663
664 int se_dev_set_max_unmap_block_desc_count(
665         struct se_device *dev,
666         u32 max_unmap_block_desc_count)
667 {
668         dev->dev_attrib.max_unmap_block_desc_count =
669                 max_unmap_block_desc_count;
670         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
671                         dev, dev->dev_attrib.max_unmap_block_desc_count);
672         return 0;
673 }
674 EXPORT_SYMBOL(se_dev_set_max_unmap_block_desc_count);
675
676 int se_dev_set_unmap_granularity(
677         struct se_device *dev,
678         u32 unmap_granularity)
679 {
680         dev->dev_attrib.unmap_granularity = unmap_granularity;
681         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
682                         dev, dev->dev_attrib.unmap_granularity);
683         return 0;
684 }
685 EXPORT_SYMBOL(se_dev_set_unmap_granularity);
686
687 int se_dev_set_unmap_granularity_alignment(
688         struct se_device *dev,
689         u32 unmap_granularity_alignment)
690 {
691         dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
692         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
693                         dev, dev->dev_attrib.unmap_granularity_alignment);
694         return 0;
695 }
696 EXPORT_SYMBOL(se_dev_set_unmap_granularity_alignment);
697
698 int se_dev_set_max_write_same_len(
699         struct se_device *dev,
700         u32 max_write_same_len)
701 {
702         dev->dev_attrib.max_write_same_len = max_write_same_len;
703         pr_debug("dev[%p]: Set max_write_same_len: %u\n",
704                         dev, dev->dev_attrib.max_write_same_len);
705         return 0;
706 }
707 EXPORT_SYMBOL(se_dev_set_max_write_same_len);
708
709 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
710 {
711         const char *configname;
712
713         configname = config_item_name(&dev->dev_group.cg_item);
714         if (strlen(configname) >= 16) {
715                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
716                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
717                         configname);
718         }
719         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
720 }
721
722 int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
723 {
724         if (dev->export_count) {
725                 pr_err("dev[%p]: Unable to change model alias"
726                         " while export_count is %d\n",
727                         dev, dev->export_count);
728                         return -EINVAL;
729         }
730
731         if (flag != 0 && flag != 1) {
732                 pr_err("Illegal value %d\n", flag);
733                 return -EINVAL;
734         }
735
736         if (flag) {
737                 dev_set_t10_wwn_model_alias(dev);
738         } else {
739                 strncpy(&dev->t10_wwn.model[0],
740                         dev->transport->inquiry_prod, 16);
741         }
742         dev->dev_attrib.emulate_model_alias = flag;
743
744         return 0;
745 }
746 EXPORT_SYMBOL(se_dev_set_emulate_model_alias);
747
748 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
749 {
750         if (flag != 0 && flag != 1) {
751                 pr_err("Illegal value %d\n", flag);
752                 return -EINVAL;
753         }
754
755         if (flag) {
756                 pr_err("dpo_emulated not supported\n");
757                 return -EINVAL;
758         }
759
760         return 0;
761 }
762 EXPORT_SYMBOL(se_dev_set_emulate_dpo);
763
764 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
765 {
766         if (flag != 0 && flag != 1) {
767                 pr_err("Illegal value %d\n", flag);
768                 return -EINVAL;
769         }
770         if (flag &&
771             dev->transport->get_write_cache) {
772                 pr_err("emulate_fua_write not supported for this device\n");
773                 return -EINVAL;
774         }
775         if (dev->export_count) {
776                 pr_err("emulate_fua_write cannot be changed with active"
777                        " exports: %d\n", dev->export_count);
778                 return -EINVAL;
779         }
780         dev->dev_attrib.emulate_fua_write = flag;
781         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
782                         dev, dev->dev_attrib.emulate_fua_write);
783         return 0;
784 }
785 EXPORT_SYMBOL(se_dev_set_emulate_fua_write);
786
787 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
788 {
789         if (flag != 0 && flag != 1) {
790                 pr_err("Illegal value %d\n", flag);
791                 return -EINVAL;
792         }
793
794         if (flag) {
795                 pr_err("ua read emulated not supported\n");
796                 return -EINVAL;
797         }
798
799         return 0;
800 }
801 EXPORT_SYMBOL(se_dev_set_emulate_fua_read);
802
803 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
804 {
805         if (flag != 0 && flag != 1) {
806                 pr_err("Illegal value %d\n", flag);
807                 return -EINVAL;
808         }
809         if (flag &&
810             dev->transport->get_write_cache) {
811                 pr_err("emulate_write_cache not supported for this device\n");
812                 return -EINVAL;
813         }
814         if (dev->export_count) {
815                 pr_err("emulate_write_cache cannot be changed with active"
816                        " exports: %d\n", dev->export_count);
817                 return -EINVAL;
818         }
819         dev->dev_attrib.emulate_write_cache = flag;
820         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
821                         dev, dev->dev_attrib.emulate_write_cache);
822         return 0;
823 }
824 EXPORT_SYMBOL(se_dev_set_emulate_write_cache);
825
826 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
827 {
828         if ((flag != 0) && (flag != 1) && (flag != 2)) {
829                 pr_err("Illegal value %d\n", flag);
830                 return -EINVAL;
831         }
832
833         if (dev->export_count) {
834                 pr_err("dev[%p]: Unable to change SE Device"
835                         " UA_INTRLCK_CTRL while export_count is %d\n",
836                         dev, dev->export_count);
837                 return -EINVAL;
838         }
839         dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
840         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
841                 dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
842
843         return 0;
844 }
845 EXPORT_SYMBOL(se_dev_set_emulate_ua_intlck_ctrl);
846
847 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
848 {
849         if ((flag != 0) && (flag != 1)) {
850                 pr_err("Illegal value %d\n", flag);
851                 return -EINVAL;
852         }
853
854         if (dev->export_count) {
855                 pr_err("dev[%p]: Unable to change SE Device TAS while"
856                         " export_count is %d\n",
857                         dev, dev->export_count);
858                 return -EINVAL;
859         }
860         dev->dev_attrib.emulate_tas = flag;
861         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
862                 dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
863
864         return 0;
865 }
866 EXPORT_SYMBOL(se_dev_set_emulate_tas);
867
868 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
869 {
870         if ((flag != 0) && (flag != 1)) {
871                 pr_err("Illegal value %d\n", flag);
872                 return -EINVAL;
873         }
874         /*
875          * We expect this value to be non-zero when generic Block Layer
876          * Discard supported is detected iblock_create_virtdevice().
877          */
878         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
879                 pr_err("Generic Block Discard not supported\n");
880                 return -ENOSYS;
881         }
882
883         dev->dev_attrib.emulate_tpu = flag;
884         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
885                                 dev, flag);
886         return 0;
887 }
888 EXPORT_SYMBOL(se_dev_set_emulate_tpu);
889
890 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
891 {
892         if ((flag != 0) && (flag != 1)) {
893                 pr_err("Illegal value %d\n", flag);
894                 return -EINVAL;
895         }
896         /*
897          * We expect this value to be non-zero when generic Block Layer
898          * Discard supported is detected iblock_create_virtdevice().
899          */
900         if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
901                 pr_err("Generic Block Discard not supported\n");
902                 return -ENOSYS;
903         }
904
905         dev->dev_attrib.emulate_tpws = flag;
906         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
907                                 dev, flag);
908         return 0;
909 }
910 EXPORT_SYMBOL(se_dev_set_emulate_tpws);
911
912 int se_dev_set_emulate_caw(struct se_device *dev, int flag)
913 {
914         if (flag != 0 && flag != 1) {
915                 pr_err("Illegal value %d\n", flag);
916                 return -EINVAL;
917         }
918         dev->dev_attrib.emulate_caw = flag;
919         pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
920                  dev, flag);
921
922         return 0;
923 }
924 EXPORT_SYMBOL(se_dev_set_emulate_caw);
925
926 int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
927 {
928         if (flag != 0 && flag != 1) {
929                 pr_err("Illegal value %d\n", flag);
930                 return -EINVAL;
931         }
932         dev->dev_attrib.emulate_3pc = flag;
933         pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
934                 dev, flag);
935
936         return 0;
937 }
938 EXPORT_SYMBOL(se_dev_set_emulate_3pc);
939
940 int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
941 {
942         int rc, old_prot = dev->dev_attrib.pi_prot_type;
943
944         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
945                 pr_err("Illegal value %d for pi_prot_type\n", flag);
946                 return -EINVAL;
947         }
948         if (flag == 2) {
949                 pr_err("DIF TYPE2 protection currently not supported\n");
950                 return -ENOSYS;
951         }
952         if (dev->dev_attrib.hw_pi_prot_type) {
953                 pr_warn("DIF protection enabled on underlying hardware,"
954                         " ignoring\n");
955                 return 0;
956         }
957         if (!dev->transport->init_prot || !dev->transport->free_prot) {
958                 /* 0 is only allowed value for non-supporting backends */
959                 if (flag == 0)
960                         return 0;
961
962                 pr_err("DIF protection not supported by backend: %s\n",
963                        dev->transport->name);
964                 return -ENOSYS;
965         }
966         if (!(dev->dev_flags & DF_CONFIGURED)) {
967                 pr_err("DIF protection requires device to be configured\n");
968                 return -ENODEV;
969         }
970         if (dev->export_count) {
971                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
972                        " export_count is %d\n", dev, dev->export_count);
973                 return -EINVAL;
974         }
975
976         dev->dev_attrib.pi_prot_type = flag;
977
978         if (flag && !old_prot) {
979                 rc = dev->transport->init_prot(dev);
980                 if (rc) {
981                         dev->dev_attrib.pi_prot_type = old_prot;
982                         return rc;
983                 }
984
985         } else if (!flag && old_prot) {
986                 dev->transport->free_prot(dev);
987         }
988         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
989
990         return 0;
991 }
992 EXPORT_SYMBOL(se_dev_set_pi_prot_type);
993
994 int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
995 {
996         int rc;
997
998         if (!flag)
999                 return 0;
1000
1001         if (flag != 1) {
1002                 pr_err("Illegal value %d for pi_prot_format\n", flag);
1003                 return -EINVAL;
1004         }
1005         if (!dev->transport->format_prot) {
1006                 pr_err("DIF protection format not supported by backend %s\n",
1007                        dev->transport->name);
1008                 return -ENOSYS;
1009         }
1010         if (!(dev->dev_flags & DF_CONFIGURED)) {
1011                 pr_err("DIF protection format requires device to be configured\n");
1012                 return -ENODEV;
1013         }
1014         if (dev->export_count) {
1015                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
1016                        " export_count is %d\n", dev, dev->export_count);
1017                 return -EINVAL;
1018         }
1019
1020         rc = dev->transport->format_prot(dev);
1021         if (rc)
1022                 return rc;
1023
1024         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
1025
1026         return 0;
1027 }
1028 EXPORT_SYMBOL(se_dev_set_pi_prot_format);
1029
1030 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1031 {
1032         if ((flag != 0) && (flag != 1)) {
1033                 pr_err("Illegal value %d\n", flag);
1034                 return -EINVAL;
1035         }
1036         dev->dev_attrib.enforce_pr_isids = flag;
1037         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1038                 (dev->dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1039         return 0;
1040 }
1041 EXPORT_SYMBOL(se_dev_set_enforce_pr_isids);
1042
1043 int se_dev_set_force_pr_aptpl(struct se_device *dev, int flag)
1044 {
1045         if ((flag != 0) && (flag != 1)) {
1046                 printk(KERN_ERR "Illegal value %d\n", flag);
1047                 return -EINVAL;
1048         }
1049         if (dev->export_count) {
1050                 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
1051                        " export_count is %d\n", dev, dev->export_count);
1052                 return -EINVAL;
1053         }
1054
1055         dev->dev_attrib.force_pr_aptpl = flag;
1056         pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", dev, flag);
1057         return 0;
1058 }
1059 EXPORT_SYMBOL(se_dev_set_force_pr_aptpl);
1060
1061 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1062 {
1063         if ((flag != 0) && (flag != 1)) {
1064                 printk(KERN_ERR "Illegal value %d\n", flag);
1065                 return -EINVAL;
1066         }
1067         dev->dev_attrib.is_nonrot = flag;
1068         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1069                dev, flag);
1070         return 0;
1071 }
1072 EXPORT_SYMBOL(se_dev_set_is_nonrot);
1073
1074 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1075 {
1076         if (flag != 0) {
1077                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1078                         " reordering not implemented\n", dev);
1079                 return -ENOSYS;
1080         }
1081         dev->dev_attrib.emulate_rest_reord = flag;
1082         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1083         return 0;
1084 }
1085 EXPORT_SYMBOL(se_dev_set_emulate_rest_reord);
1086
1087 /*
1088  * Note, this can only be called on unexported SE Device Object.
1089  */
1090 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1091 {
1092         if (dev->export_count) {
1093                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1094                         " export_count is %d\n",
1095                         dev, dev->export_count);
1096                 return -EINVAL;
1097         }
1098         if (!queue_depth) {
1099                 pr_err("dev[%p]: Illegal ZERO value for queue"
1100                         "_depth\n", dev);
1101                 return -EINVAL;
1102         }
1103
1104         if (queue_depth > dev->dev_attrib.queue_depth) {
1105                 if (queue_depth > dev->dev_attrib.hw_queue_depth) {
1106                         pr_err("dev[%p]: Passed queue_depth:"
1107                                 " %u exceeds TCM/SE_Device MAX"
1108                                 " TCQ: %u\n", dev, queue_depth,
1109                                 dev->dev_attrib.hw_queue_depth);
1110                         return -EINVAL;
1111                 }
1112         }
1113         dev->dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1114         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1115                         dev, queue_depth);
1116         return 0;
1117 }
1118 EXPORT_SYMBOL(se_dev_set_queue_depth);
1119
1120 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1121 {
1122         if (dev->export_count) {
1123                 pr_err("dev[%p]: Unable to change SE Device"
1124                         " optimal_sectors while export_count is %d\n",
1125                         dev, dev->export_count);
1126                 return -EINVAL;
1127         }
1128         if (optimal_sectors > dev->dev_attrib.hw_max_sectors) {
1129                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1130                         " greater than hw_max_sectors: %u\n", dev,
1131                         optimal_sectors, dev->dev_attrib.hw_max_sectors);
1132                 return -EINVAL;
1133         }
1134
1135         dev->dev_attrib.optimal_sectors = optimal_sectors;
1136         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1137                         dev, optimal_sectors);
1138         return 0;
1139 }
1140 EXPORT_SYMBOL(se_dev_set_optimal_sectors);
1141
1142 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1143 {
1144         if (dev->export_count) {
1145                 pr_err("dev[%p]: Unable to change SE Device block_size"
1146                         " while export_count is %d\n",
1147                         dev, dev->export_count);
1148                 return -EINVAL;
1149         }
1150
1151         if ((block_size != 512) &&
1152             (block_size != 1024) &&
1153             (block_size != 2048) &&
1154             (block_size != 4096)) {
1155                 pr_err("dev[%p]: Illegal value for block_device: %u"
1156                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1157                         dev, block_size);
1158                 return -EINVAL;
1159         }
1160
1161         dev->dev_attrib.block_size = block_size;
1162         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1163                         dev, block_size);
1164
1165         if (dev->dev_attrib.max_bytes_per_io)
1166                 dev->dev_attrib.hw_max_sectors =
1167                         dev->dev_attrib.max_bytes_per_io / block_size;
1168
1169         return 0;
1170 }
1171 EXPORT_SYMBOL(se_dev_set_block_size);
1172
1173 struct se_lun *core_dev_add_lun(
1174         struct se_portal_group *tpg,
1175         struct se_device *dev,
1176         u32 unpacked_lun)
1177 {
1178         struct se_lun *lun;
1179         int rc;
1180
1181         lun = core_tpg_alloc_lun(tpg, unpacked_lun);
1182         if (IS_ERR(lun))
1183                 return lun;
1184
1185         rc = core_tpg_add_lun(tpg, lun,
1186                                 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1187         if (rc < 0)
1188                 return ERR_PTR(rc);
1189
1190         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1191                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1192                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1193                 tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
1194         /*
1195          * Update LUN maps for dynamically added initiators when
1196          * generate_node_acl is enabled.
1197          */
1198         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1199                 struct se_node_acl *acl;
1200                 spin_lock_irq(&tpg->acl_node_lock);
1201                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1202                         if (acl->dynamic_node_acl &&
1203                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1204                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1205                                 spin_unlock_irq(&tpg->acl_node_lock);
1206                                 core_tpg_add_node_to_devs(acl, tpg);
1207                                 spin_lock_irq(&tpg->acl_node_lock);
1208                         }
1209                 }
1210                 spin_unlock_irq(&tpg->acl_node_lock);
1211         }
1212
1213         return lun;
1214 }
1215
1216 /*      core_dev_del_lun():
1217  *
1218  *
1219  */
1220 void core_dev_del_lun(
1221         struct se_portal_group *tpg,
1222         struct se_lun *lun)
1223 {
1224         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivating %s Logical Unit from"
1225                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1226                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1227                 tpg->se_tpg_tfo->get_fabric_name());
1228
1229         core_tpg_remove_lun(tpg, lun);
1230 }
1231
1232 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1233 {
1234         struct se_lun *lun;
1235
1236         spin_lock(&tpg->tpg_lun_lock);
1237         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1238                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1239                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1240                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1241                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1242                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1243                 spin_unlock(&tpg->tpg_lun_lock);
1244                 return NULL;
1245         }
1246         lun = tpg->tpg_lun_list[unpacked_lun];
1247
1248         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1249                 pr_err("%s Logical Unit Number: %u is not free on"
1250                         " Target Portal Group: %hu, ignoring request.\n",
1251                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1252                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1253                 spin_unlock(&tpg->tpg_lun_lock);
1254                 return NULL;
1255         }
1256         spin_unlock(&tpg->tpg_lun_lock);
1257
1258         return lun;
1259 }
1260
1261 /*      core_dev_get_lun():
1262  *
1263  *
1264  */
1265 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1266 {
1267         struct se_lun *lun;
1268
1269         spin_lock(&tpg->tpg_lun_lock);
1270         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1271                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1272                         "_TPG-1: %u for Target Portal Group: %hu\n",
1273                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1274                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1275                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1276                 spin_unlock(&tpg->tpg_lun_lock);
1277                 return NULL;
1278         }
1279         lun = tpg->tpg_lun_list[unpacked_lun];
1280
1281         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1282                 pr_err("%s Logical Unit Number: %u is not active on"
1283                         " Target Portal Group: %hu, ignoring request.\n",
1284                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1285                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1286                 spin_unlock(&tpg->tpg_lun_lock);
1287                 return NULL;
1288         }
1289         spin_unlock(&tpg->tpg_lun_lock);
1290
1291         return lun;
1292 }
1293
1294 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1295         struct se_portal_group *tpg,
1296         struct se_node_acl *nacl,
1297         u32 mapped_lun,
1298         int *ret)
1299 {
1300         struct se_lun_acl *lacl;
1301
1302         if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
1303                 pr_err("%s InitiatorName exceeds maximum size.\n",
1304                         tpg->se_tpg_tfo->get_fabric_name());
1305                 *ret = -EOVERFLOW;
1306                 return NULL;
1307         }
1308         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1309         if (!lacl) {
1310                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1311                 *ret = -ENOMEM;
1312                 return NULL;
1313         }
1314
1315         INIT_LIST_HEAD(&lacl->lacl_list);
1316         lacl->mapped_lun = mapped_lun;
1317         lacl->se_lun_nacl = nacl;
1318         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s",
1319                  nacl->initiatorname);
1320
1321         return lacl;
1322 }
1323
1324 int core_dev_add_initiator_node_lun_acl(
1325         struct se_portal_group *tpg,
1326         struct se_lun_acl *lacl,
1327         u32 unpacked_lun,
1328         u32 lun_access)
1329 {
1330         struct se_lun *lun;
1331         struct se_node_acl *nacl;
1332
1333         lun = core_dev_get_lun(tpg, unpacked_lun);
1334         if (!lun) {
1335                 pr_err("%s Logical Unit Number: %u is not active on"
1336                         " Target Portal Group: %hu, ignoring request.\n",
1337                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1338                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1339                 return -EINVAL;
1340         }
1341
1342         nacl = lacl->se_lun_nacl;
1343         if (!nacl)
1344                 return -EINVAL;
1345
1346         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1347             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1348                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1349
1350         lacl->se_lun = lun;
1351
1352         if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
1353                         lun_access, nacl, tpg) < 0)
1354                 return -EINVAL;
1355
1356         spin_lock(&lun->lun_acl_lock);
1357         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1358         atomic_inc_mb(&lun->lun_acl_count);
1359         spin_unlock(&lun->lun_acl_lock);
1360
1361         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1362                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1363                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1364                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1365                 lacl->initiatorname);
1366         /*
1367          * Check to see if there are any existing persistent reservation APTPL
1368          * pre-registrations that need to be enabled for this LUN ACL..
1369          */
1370         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, nacl,
1371                                             lacl->mapped_lun);
1372         return 0;
1373 }
1374
1375 /*      core_dev_del_initiator_node_lun_acl():
1376  *
1377  *
1378  */
1379 int core_dev_del_initiator_node_lun_acl(
1380         struct se_portal_group *tpg,
1381         struct se_lun *lun,
1382         struct se_lun_acl *lacl)
1383 {
1384         struct se_node_acl *nacl;
1385
1386         nacl = lacl->se_lun_nacl;
1387         if (!nacl)
1388                 return -EINVAL;
1389
1390         spin_lock(&lun->lun_acl_lock);
1391         list_del(&lacl->lacl_list);
1392         atomic_dec_mb(&lun->lun_acl_count);
1393         spin_unlock(&lun->lun_acl_lock);
1394
1395         core_disable_device_list_for_node(lun, NULL, lacl->mapped_lun,
1396                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
1397
1398         lacl->se_lun = NULL;
1399
1400         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1401                 " InitiatorNode: %s Mapped LUN: %u\n",
1402                 tpg->se_tpg_tfo->get_fabric_name(),
1403                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1404                 lacl->initiatorname, lacl->mapped_lun);
1405
1406         return 0;
1407 }
1408
1409 void core_dev_free_initiator_node_lun_acl(
1410         struct se_portal_group *tpg,
1411         struct se_lun_acl *lacl)
1412 {
1413         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1414                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1415                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1416                 tpg->se_tpg_tfo->get_fabric_name(),
1417                 lacl->initiatorname, lacl->mapped_lun);
1418
1419         kfree(lacl);
1420 }
1421
1422 static void scsi_dump_inquiry(struct se_device *dev)
1423 {
1424         struct t10_wwn *wwn = &dev->t10_wwn;
1425         char buf[17];
1426         int i, device_type;
1427         /*
1428          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1429          */
1430         for (i = 0; i < 8; i++)
1431                 if (wwn->vendor[i] >= 0x20)
1432                         buf[i] = wwn->vendor[i];
1433                 else
1434                         buf[i] = ' ';
1435         buf[i] = '\0';
1436         pr_debug("  Vendor: %s\n", buf);
1437
1438         for (i = 0; i < 16; i++)
1439                 if (wwn->model[i] >= 0x20)
1440                         buf[i] = wwn->model[i];
1441                 else
1442                         buf[i] = ' ';
1443         buf[i] = '\0';
1444         pr_debug("  Model: %s\n", buf);
1445
1446         for (i = 0; i < 4; i++)
1447                 if (wwn->revision[i] >= 0x20)
1448                         buf[i] = wwn->revision[i];
1449                 else
1450                         buf[i] = ' ';
1451         buf[i] = '\0';
1452         pr_debug("  Revision: %s\n", buf);
1453
1454         device_type = dev->transport->get_device_type(dev);
1455         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1456 }
1457
1458 struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
1459 {
1460         struct se_device *dev;
1461         struct se_lun *xcopy_lun;
1462
1463         dev = hba->transport->alloc_device(hba, name);
1464         if (!dev)
1465                 return NULL;
1466
1467         dev->dev_link_magic = SE_DEV_LINK_MAGIC;
1468         dev->se_hba = hba;
1469         dev->transport = hba->transport;
1470         dev->prot_length = sizeof(struct se_dif_v1_tuple);
1471
1472         INIT_LIST_HEAD(&dev->dev_list);
1473         INIT_LIST_HEAD(&dev->dev_sep_list);
1474         INIT_LIST_HEAD(&dev->dev_tmr_list);
1475         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1476         INIT_LIST_HEAD(&dev->state_list);
1477         INIT_LIST_HEAD(&dev->qf_cmd_list);
1478         INIT_LIST_HEAD(&dev->g_dev_node);
1479         spin_lock_init(&dev->execute_task_lock);
1480         spin_lock_init(&dev->delayed_cmd_lock);
1481         spin_lock_init(&dev->dev_reservation_lock);
1482         spin_lock_init(&dev->se_port_lock);
1483         spin_lock_init(&dev->se_tmr_lock);
1484         spin_lock_init(&dev->qf_cmd_lock);
1485         sema_init(&dev->caw_sem, 1);
1486         atomic_set(&dev->dev_ordered_id, 0);
1487         INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
1488         spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
1489         INIT_LIST_HEAD(&dev->t10_pr.registration_list);
1490         INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
1491         spin_lock_init(&dev->t10_pr.registration_lock);
1492         spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
1493         INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
1494         spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
1495         INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
1496         spin_lock_init(&dev->t10_alua.lba_map_lock);
1497
1498         dev->t10_wwn.t10_dev = dev;
1499         dev->t10_alua.t10_dev = dev;
1500
1501         dev->dev_attrib.da_dev = dev;
1502         dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
1503         dev->dev_attrib.emulate_dpo = DA_EMULATE_DPO;
1504         dev->dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
1505         dev->dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
1506         dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
1507         dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
1508         dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
1509         dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
1510         dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
1511         dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
1512         dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
1513         dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
1514         dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
1515         dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
1516         dev->dev_attrib.is_nonrot = DA_IS_NONROT;
1517         dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
1518         dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
1519         dev->dev_attrib.max_unmap_block_desc_count =
1520                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
1521         dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
1522         dev->dev_attrib.unmap_granularity_alignment =
1523                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
1524         dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
1525
1526         xcopy_lun = &dev->xcopy_lun;
1527         xcopy_lun->lun_se_dev = dev;
1528         init_completion(&xcopy_lun->lun_shutdown_comp);
1529         INIT_LIST_HEAD(&xcopy_lun->lun_acl_list);
1530         spin_lock_init(&xcopy_lun->lun_acl_lock);
1531         spin_lock_init(&xcopy_lun->lun_sep_lock);
1532         init_completion(&xcopy_lun->lun_ref_comp);
1533
1534         return dev;
1535 }
1536
1537 int target_configure_device(struct se_device *dev)
1538 {
1539         struct se_hba *hba = dev->se_hba;
1540         int ret;
1541
1542         if (dev->dev_flags & DF_CONFIGURED) {
1543                 pr_err("se_dev->se_dev_ptr already set for storage"
1544                                 " object\n");
1545                 return -EEXIST;
1546         }
1547
1548         ret = dev->transport->configure_device(dev);
1549         if (ret)
1550                 goto out;
1551         /*
1552          * XXX: there is not much point to have two different values here..
1553          */
1554         dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
1555         dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
1556
1557         /*
1558          * Align max_hw_sectors down to PAGE_SIZE I/O transfers
1559          */
1560         dev->dev_attrib.hw_max_sectors =
1561                 se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
1562                                          dev->dev_attrib.hw_block_size);
1563         dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
1564
1565         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1566         dev->creation_time = get_jiffies_64();
1567
1568         ret = core_setup_alua(dev);
1569         if (ret)
1570                 goto out;
1571
1572         /*
1573          * Startup the struct se_device processing thread
1574          */
1575         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1576                                       dev->transport->name);
1577         if (!dev->tmr_wq) {
1578                 pr_err("Unable to create tmr workqueue for %s\n",
1579                         dev->transport->name);
1580                 ret = -ENOMEM;
1581                 goto out_free_alua;
1582         }
1583
1584         /*
1585          * Setup work_queue for QUEUE_FULL
1586          */
1587         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1588
1589         /*
1590          * Preload the initial INQUIRY const values if we are doing
1591          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1592          * passthrough because this is being provided by the backend LLD.
1593          */
1594         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1595                 strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1596                 strncpy(&dev->t10_wwn.model[0],
1597                         dev->transport->inquiry_prod, 16);
1598                 strncpy(&dev->t10_wwn.revision[0],
1599                         dev->transport->inquiry_rev, 4);
1600         }
1601
1602         scsi_dump_inquiry(dev);
1603
1604         spin_lock(&hba->device_lock);
1605         hba->dev_count++;
1606         spin_unlock(&hba->device_lock);
1607
1608         mutex_lock(&g_device_mutex);
1609         list_add_tail(&dev->g_dev_node, &g_device_list);
1610         mutex_unlock(&g_device_mutex);
1611
1612         dev->dev_flags |= DF_CONFIGURED;
1613
1614         return 0;
1615
1616 out_free_alua:
1617         core_alua_free_lu_gp_mem(dev);
1618 out:
1619         se_release_vpd_for_dev(dev);
1620         return ret;
1621 }
1622
1623 void target_free_device(struct se_device *dev)
1624 {
1625         struct se_hba *hba = dev->se_hba;
1626
1627         WARN_ON(!list_empty(&dev->dev_sep_list));
1628
1629         if (dev->dev_flags & DF_CONFIGURED) {
1630                 destroy_workqueue(dev->tmr_wq);
1631
1632                 mutex_lock(&g_device_mutex);
1633                 list_del(&dev->g_dev_node);
1634                 mutex_unlock(&g_device_mutex);
1635
1636                 spin_lock(&hba->device_lock);
1637                 hba->dev_count--;
1638                 spin_unlock(&hba->device_lock);
1639         }
1640
1641         core_alua_free_lu_gp_mem(dev);
1642         core_alua_set_lba_map(dev, NULL, 0, 0);
1643         core_scsi3_free_all_registrations(dev);
1644         se_release_vpd_for_dev(dev);
1645
1646         if (dev->transport->free_prot)
1647                 dev->transport->free_prot(dev);
1648
1649         dev->transport->free_device(dev);
1650 }
1651
1652 int core_dev_setup_virtual_lun0(void)
1653 {
1654         struct se_hba *hba;
1655         struct se_device *dev;
1656         char buf[] = "rd_pages=8,rd_nullio=1";
1657         int ret;
1658
1659         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1660         if (IS_ERR(hba))
1661                 return PTR_ERR(hba);
1662
1663         dev = target_alloc_device(hba, "virt_lun0");
1664         if (!dev) {
1665                 ret = -ENOMEM;
1666                 goto out_free_hba;
1667         }
1668
1669         hba->transport->set_configfs_dev_params(dev, buf, sizeof(buf));
1670
1671         ret = target_configure_device(dev);
1672         if (ret)
1673                 goto out_free_se_dev;
1674
1675         lun0_hba = hba;
1676         g_lun0_dev = dev;
1677         return 0;
1678
1679 out_free_se_dev:
1680         target_free_device(dev);
1681 out_free_hba:
1682         core_delete_hba(hba);
1683         return ret;
1684 }
1685
1686
1687 void core_dev_release_virtual_lun0(void)
1688 {
1689         struct se_hba *hba = lun0_hba;
1690
1691         if (!hba)
1692                 return;
1693
1694         if (g_lun0_dev)
1695                 target_free_device(g_lun0_dev);
1696         core_delete_hba(hba);
1697 }