target/tcm_fc: fix the lockdep warning due to inconsistent lock state
[linux-2.6.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  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
8  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
9  * Copyright (c) 2007-2010 Rising Tide Systems
10  * Copyright (c) 2008-2010 Linux-iSCSI.org
11  *
12  * Nicholas A. Bellinger <nab@kernel.org>
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or
17  * (at your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22  * GNU General Public License for more details.
23  *
24  * You should have received a copy of the GNU General Public License
25  * along with this program; if not, write to the Free Software
26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27  *
28  ******************************************************************************/
29
30 #include <linux/net.h>
31 #include <linux/string.h>
32 #include <linux/delay.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
37 #include <linux/in.h>
38 #include <linux/export.h>
39 #include <net/sock.h>
40 #include <net/tcp.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_device.h>
43
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47
48 #include "target_core_internal.h"
49 #include "target_core_alua.h"
50 #include "target_core_pr.h"
51 #include "target_core_ua.h"
52
53 static void se_dev_start(struct se_device *dev);
54 static void se_dev_stop(struct se_device *dev);
55
56 static struct se_hba *lun0_hba;
57 static struct se_subsystem_dev *lun0_su_dev;
58 /* not static, needed by tpg.c */
59 struct se_device *g_lun0_dev;
60
61 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
62 {
63         struct se_lun *se_lun = NULL;
64         struct se_session *se_sess = se_cmd->se_sess;
65         struct se_device *dev;
66         unsigned long flags;
67
68         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
69                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
70                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
71                 return -ENODEV;
72         }
73
74         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
75         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
76         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
77                 struct se_dev_entry *deve = se_cmd->se_deve;
78
79                 deve->total_cmds++;
80                 deve->total_bytes += se_cmd->data_length;
81
82                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
83                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
84                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
85                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
86                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
87                                 " Access for 0x%08x\n",
88                                 se_cmd->se_tfo->get_fabric_name(),
89                                 unpacked_lun);
90                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
91                         return -EACCES;
92                 }
93
94                 if (se_cmd->data_direction == DMA_TO_DEVICE)
95                         deve->write_bytes += se_cmd->data_length;
96                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
97                         deve->read_bytes += se_cmd->data_length;
98
99                 deve->deve_cmds++;
100
101                 se_lun = deve->se_lun;
102                 se_cmd->se_lun = deve->se_lun;
103                 se_cmd->pr_res_key = deve->pr_res_key;
104                 se_cmd->orig_fe_lun = unpacked_lun;
105                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
106         }
107         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
108
109         if (!se_lun) {
110                 /*
111                  * Use the se_portal_group->tpg_virt_lun0 to allow for
112                  * REPORT_LUNS, et al to be returned when no active
113                  * MappedLUN=0 exists for this Initiator Port.
114                  */
115                 if (unpacked_lun != 0) {
116                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
117                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
118                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
119                                 " Access for 0x%08x\n",
120                                 se_cmd->se_tfo->get_fabric_name(),
121                                 unpacked_lun);
122                         return -ENODEV;
123                 }
124                 /*
125                  * Force WRITE PROTECT for virtual LUN 0
126                  */
127                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
128                     (se_cmd->data_direction != DMA_NONE)) {
129                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
130                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
131                         return -EACCES;
132                 }
133
134                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
135                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
136                 se_cmd->orig_fe_lun = 0;
137                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
138         }
139         /*
140          * Determine if the struct se_lun is online.
141          * FIXME: Check for LUN_RESET + UNIT Attention
142          */
143         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
144                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
145                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
146                 return -ENODEV;
147         }
148
149         /* Directly associate cmd with se_dev */
150         se_cmd->se_dev = se_lun->lun_se_dev;
151
152         /* TODO: get rid of this and use atomics for stats */
153         dev = se_lun->lun_se_dev;
154         spin_lock_irqsave(&dev->stats_lock, flags);
155         dev->num_cmds++;
156         if (se_cmd->data_direction == DMA_TO_DEVICE)
157                 dev->write_bytes += se_cmd->data_length;
158         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
159                 dev->read_bytes += se_cmd->data_length;
160         spin_unlock_irqrestore(&dev->stats_lock, flags);
161
162         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
163         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
164         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
165
166         return 0;
167 }
168 EXPORT_SYMBOL(transport_lookup_cmd_lun);
169
170 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
171 {
172         struct se_dev_entry *deve;
173         struct se_lun *se_lun = NULL;
174         struct se_session *se_sess = se_cmd->se_sess;
175         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
176         unsigned long flags;
177
178         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
179                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
180                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
181                 return -ENODEV;
182         }
183
184         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
185         se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
186         deve = se_cmd->se_deve;
187
188         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
189                 se_tmr->tmr_lun = deve->se_lun;
190                 se_cmd->se_lun = deve->se_lun;
191                 se_lun = deve->se_lun;
192                 se_cmd->pr_res_key = deve->pr_res_key;
193                 se_cmd->orig_fe_lun = unpacked_lun;
194         }
195         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
196
197         if (!se_lun) {
198                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
199                         " Access for 0x%08x\n",
200                         se_cmd->se_tfo->get_fabric_name(),
201                         unpacked_lun);
202                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
203                 return -ENODEV;
204         }
205         /*
206          * Determine if the struct se_lun is online.
207          * FIXME: Check for LUN_RESET + UNIT Attention
208          */
209         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
210                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
211                 return -ENODEV;
212         }
213
214         /* Directly associate cmd with se_dev */
215         se_cmd->se_dev = se_lun->lun_se_dev;
216         se_tmr->tmr_dev = se_lun->lun_se_dev;
217
218         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
219         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
220         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
221
222         return 0;
223 }
224 EXPORT_SYMBOL(transport_lookup_tmr_lun);
225
226 /*
227  * This function is called from core_scsi3_emulate_pro_register_and_move()
228  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
229  * when a matching rtpi is found.
230  */
231 struct se_dev_entry *core_get_se_deve_from_rtpi(
232         struct se_node_acl *nacl,
233         u16 rtpi)
234 {
235         struct se_dev_entry *deve;
236         struct se_lun *lun;
237         struct se_port *port;
238         struct se_portal_group *tpg = nacl->se_tpg;
239         u32 i;
240
241         spin_lock_irq(&nacl->device_list_lock);
242         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
243                 deve = nacl->device_list[i];
244
245                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
246                         continue;
247
248                 lun = deve->se_lun;
249                 if (!lun) {
250                         pr_err("%s device entries device pointer is"
251                                 " NULL, but Initiator has access.\n",
252                                 tpg->se_tpg_tfo->get_fabric_name());
253                         continue;
254                 }
255                 port = lun->lun_sep;
256                 if (!port) {
257                         pr_err("%s device entries device pointer is"
258                                 " NULL, but Initiator has access.\n",
259                                 tpg->se_tpg_tfo->get_fabric_name());
260                         continue;
261                 }
262                 if (port->sep_rtpi != rtpi)
263                         continue;
264
265                 atomic_inc(&deve->pr_ref_count);
266                 smp_mb__after_atomic_inc();
267                 spin_unlock_irq(&nacl->device_list_lock);
268
269                 return deve;
270         }
271         spin_unlock_irq(&nacl->device_list_lock);
272
273         return NULL;
274 }
275
276 int core_free_device_list_for_node(
277         struct se_node_acl *nacl,
278         struct se_portal_group *tpg)
279 {
280         struct se_dev_entry *deve;
281         struct se_lun *lun;
282         u32 i;
283
284         if (!nacl->device_list)
285                 return 0;
286
287         spin_lock_irq(&nacl->device_list_lock);
288         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
289                 deve = nacl->device_list[i];
290
291                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
292                         continue;
293
294                 if (!deve->se_lun) {
295                         pr_err("%s device entries device pointer is"
296                                 " NULL, but Initiator has access.\n",
297                                 tpg->se_tpg_tfo->get_fabric_name());
298                         continue;
299                 }
300                 lun = deve->se_lun;
301
302                 spin_unlock_irq(&nacl->device_list_lock);
303                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
304                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
305                 spin_lock_irq(&nacl->device_list_lock);
306         }
307         spin_unlock_irq(&nacl->device_list_lock);
308
309         array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
310         nacl->device_list = NULL;
311
312         return 0;
313 }
314
315 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
316 {
317         struct se_dev_entry *deve;
318         unsigned long flags;
319
320         spin_lock_irqsave(&se_nacl->device_list_lock, flags);
321         deve = se_nacl->device_list[se_cmd->orig_fe_lun];
322         deve->deve_cmds--;
323         spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
324 }
325
326 void core_update_device_list_access(
327         u32 mapped_lun,
328         u32 lun_access,
329         struct se_node_acl *nacl)
330 {
331         struct se_dev_entry *deve;
332
333         spin_lock_irq(&nacl->device_list_lock);
334         deve = nacl->device_list[mapped_lun];
335         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
336                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
337                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
338         } else {
339                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
340                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
341         }
342         spin_unlock_irq(&nacl->device_list_lock);
343 }
344
345 /*      core_update_device_list_for_node():
346  *
347  *
348  */
349 int core_update_device_list_for_node(
350         struct se_lun *lun,
351         struct se_lun_acl *lun_acl,
352         u32 mapped_lun,
353         u32 lun_access,
354         struct se_node_acl *nacl,
355         struct se_portal_group *tpg,
356         int enable)
357 {
358         struct se_port *port = lun->lun_sep;
359         struct se_dev_entry *deve = nacl->device_list[mapped_lun];
360         int trans = 0;
361         /*
362          * If the MappedLUN entry is being disabled, the entry in
363          * port->sep_alua_list must be removed now before clearing the
364          * struct se_dev_entry pointers below as logic in
365          * core_alua_do_transition_tg_pt() depends on these being present.
366          */
367         if (!enable) {
368                 /*
369                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
370                  * that have not been explicitly concerted to MappedLUNs ->
371                  * struct se_lun_acl, but we remove deve->alua_port_list from
372                  * port->sep_alua_list. This also means that active UAs and
373                  * NodeACL context specific PR metadata for demo-mode
374                  * MappedLUN *deve will be released below..
375                  */
376                 spin_lock_bh(&port->sep_alua_lock);
377                 list_del(&deve->alua_port_list);
378                 spin_unlock_bh(&port->sep_alua_lock);
379         }
380
381         spin_lock_irq(&nacl->device_list_lock);
382         if (enable) {
383                 /*
384                  * Check if the call is handling demo mode -> explict LUN ACL
385                  * transition.  This transition must be for the same struct se_lun
386                  * + mapped_lun that was setup in demo mode..
387                  */
388                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
389                         if (deve->se_lun_acl != NULL) {
390                                 pr_err("struct se_dev_entry->se_lun_acl"
391                                         " already set for demo mode -> explict"
392                                         " LUN ACL transition\n");
393                                 spin_unlock_irq(&nacl->device_list_lock);
394                                 return -EINVAL;
395                         }
396                         if (deve->se_lun != lun) {
397                                 pr_err("struct se_dev_entry->se_lun does"
398                                         " match passed struct se_lun for demo mode"
399                                         " -> explict LUN ACL transition\n");
400                                 spin_unlock_irq(&nacl->device_list_lock);
401                                 return -EINVAL;
402                         }
403                         deve->se_lun_acl = lun_acl;
404                         trans = 1;
405                 } else {
406                         deve->se_lun = lun;
407                         deve->se_lun_acl = lun_acl;
408                         deve->mapped_lun = mapped_lun;
409                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
410                 }
411
412                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
413                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
414                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
415                 } else {
416                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
417                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
418                 }
419
420                 if (trans) {
421                         spin_unlock_irq(&nacl->device_list_lock);
422                         return 0;
423                 }
424                 deve->creation_time = get_jiffies_64();
425                 deve->attach_count++;
426                 spin_unlock_irq(&nacl->device_list_lock);
427
428                 spin_lock_bh(&port->sep_alua_lock);
429                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
430                 spin_unlock_bh(&port->sep_alua_lock);
431
432                 return 0;
433         }
434         /*
435          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
436          * PR operation to complete.
437          */
438         spin_unlock_irq(&nacl->device_list_lock);
439         while (atomic_read(&deve->pr_ref_count) != 0)
440                 cpu_relax();
441         spin_lock_irq(&nacl->device_list_lock);
442         /*
443          * Disable struct se_dev_entry LUN ACL mapping
444          */
445         core_scsi3_ua_release_all(deve);
446         deve->se_lun = NULL;
447         deve->se_lun_acl = NULL;
448         deve->lun_flags = 0;
449         deve->creation_time = 0;
450         deve->attach_count--;
451         spin_unlock_irq(&nacl->device_list_lock);
452
453         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
454         return 0;
455 }
456
457 /*      core_clear_lun_from_tpg():
458  *
459  *
460  */
461 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
462 {
463         struct se_node_acl *nacl;
464         struct se_dev_entry *deve;
465         u32 i;
466
467         spin_lock_irq(&tpg->acl_node_lock);
468         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
469                 spin_unlock_irq(&tpg->acl_node_lock);
470
471                 spin_lock_irq(&nacl->device_list_lock);
472                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
473                         deve = nacl->device_list[i];
474                         if (lun != deve->se_lun)
475                                 continue;
476                         spin_unlock_irq(&nacl->device_list_lock);
477
478                         core_update_device_list_for_node(lun, NULL,
479                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
480                                 nacl, tpg, 0);
481
482                         spin_lock_irq(&nacl->device_list_lock);
483                 }
484                 spin_unlock_irq(&nacl->device_list_lock);
485
486                 spin_lock_irq(&tpg->acl_node_lock);
487         }
488         spin_unlock_irq(&tpg->acl_node_lock);
489 }
490
491 static struct se_port *core_alloc_port(struct se_device *dev)
492 {
493         struct se_port *port, *port_tmp;
494
495         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
496         if (!port) {
497                 pr_err("Unable to allocate struct se_port\n");
498                 return ERR_PTR(-ENOMEM);
499         }
500         INIT_LIST_HEAD(&port->sep_alua_list);
501         INIT_LIST_HEAD(&port->sep_list);
502         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
503         spin_lock_init(&port->sep_alua_lock);
504         mutex_init(&port->sep_tg_pt_md_mutex);
505
506         spin_lock(&dev->se_port_lock);
507         if (dev->dev_port_count == 0x0000ffff) {
508                 pr_warn("Reached dev->dev_port_count =="
509                                 " 0x0000ffff\n");
510                 spin_unlock(&dev->se_port_lock);
511                 return ERR_PTR(-ENOSPC);
512         }
513 again:
514         /*
515          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
516          * Here is the table from spc4r17 section 7.7.3.8.
517          *
518          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
519          *
520          * Code      Description
521          * 0h        Reserved
522          * 1h        Relative port 1, historically known as port A
523          * 2h        Relative port 2, historically known as port B
524          * 3h to FFFFh    Relative port 3 through 65 535
525          */
526         port->sep_rtpi = dev->dev_rpti_counter++;
527         if (!port->sep_rtpi)
528                 goto again;
529
530         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
531                 /*
532                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
533                  * for 16-bit wrap..
534                  */
535                 if (port->sep_rtpi == port_tmp->sep_rtpi)
536                         goto again;
537         }
538         spin_unlock(&dev->se_port_lock);
539
540         return port;
541 }
542
543 static void core_export_port(
544         struct se_device *dev,
545         struct se_portal_group *tpg,
546         struct se_port *port,
547         struct se_lun *lun)
548 {
549         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
550         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
551
552         spin_lock(&dev->se_port_lock);
553         spin_lock(&lun->lun_sep_lock);
554         port->sep_tpg = tpg;
555         port->sep_lun = lun;
556         lun->lun_sep = port;
557         spin_unlock(&lun->lun_sep_lock);
558
559         list_add_tail(&port->sep_list, &dev->dev_sep_list);
560         spin_unlock(&dev->se_port_lock);
561
562         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
563                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
564                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
565                         pr_err("Unable to allocate t10_alua_tg_pt"
566                                         "_gp_member_t\n");
567                         return;
568                 }
569                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
570                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
571                         su_dev->t10_alua.default_tg_pt_gp);
572                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
573                 pr_debug("%s/%s: Adding to default ALUA Target Port"
574                         " Group: alua/default_tg_pt_gp\n",
575                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
576         }
577
578         dev->dev_port_count++;
579         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
580 }
581
582 /*
583  *      Called with struct se_device->se_port_lock spinlock held.
584  */
585 static void core_release_port(struct se_device *dev, struct se_port *port)
586         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
587 {
588         /*
589          * Wait for any port reference for PR ALL_TG_PT=1 operation
590          * to complete in __core_scsi3_alloc_registration()
591          */
592         spin_unlock(&dev->se_port_lock);
593         if (atomic_read(&port->sep_tg_pt_ref_cnt))
594                 cpu_relax();
595         spin_lock(&dev->se_port_lock);
596
597         core_alua_free_tg_pt_gp_mem(port);
598
599         list_del(&port->sep_list);
600         dev->dev_port_count--;
601         kfree(port);
602 }
603
604 int core_dev_export(
605         struct se_device *dev,
606         struct se_portal_group *tpg,
607         struct se_lun *lun)
608 {
609         struct se_port *port;
610
611         port = core_alloc_port(dev);
612         if (IS_ERR(port))
613                 return PTR_ERR(port);
614
615         lun->lun_se_dev = dev;
616         se_dev_start(dev);
617
618         atomic_inc(&dev->dev_export_obj.obj_access_count);
619         core_export_port(dev, tpg, port, lun);
620         return 0;
621 }
622
623 void core_dev_unexport(
624         struct se_device *dev,
625         struct se_portal_group *tpg,
626         struct se_lun *lun)
627 {
628         struct se_port *port = lun->lun_sep;
629
630         spin_lock(&lun->lun_sep_lock);
631         if (lun->lun_se_dev == NULL) {
632                 spin_unlock(&lun->lun_sep_lock);
633                 return;
634         }
635         spin_unlock(&lun->lun_sep_lock);
636
637         spin_lock(&dev->se_port_lock);
638         atomic_dec(&dev->dev_export_obj.obj_access_count);
639         core_release_port(dev, port);
640         spin_unlock(&dev->se_port_lock);
641
642         se_dev_stop(dev);
643         lun->lun_se_dev = NULL;
644 }
645
646 int target_report_luns(struct se_task *se_task)
647 {
648         struct se_cmd *se_cmd = se_task->task_se_cmd;
649         struct se_dev_entry *deve;
650         struct se_session *se_sess = se_cmd->se_sess;
651         unsigned char *buf;
652         u32 lun_count = 0, offset = 8, i;
653
654         buf = transport_kmap_data_sg(se_cmd);
655         if (!buf)
656                 return -ENOMEM;
657
658         /*
659          * If no struct se_session pointer is present, this struct se_cmd is
660          * coming via a target_core_mod PASSTHROUGH op, and not through
661          * a $FABRIC_MOD.  In that case, report LUN=0 only.
662          */
663         if (!se_sess) {
664                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
665                 lun_count = 1;
666                 goto done;
667         }
668
669         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
670         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
671                 deve = se_sess->se_node_acl->device_list[i];
672                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
673                         continue;
674                 /*
675                  * We determine the correct LUN LIST LENGTH even once we
676                  * have reached the initial allocation length.
677                  * See SPC2-R20 7.19.
678                  */
679                 lun_count++;
680                 if ((offset + 8) > se_cmd->data_length)
681                         continue;
682
683                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
684                 offset += 8;
685         }
686         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
687
688         /*
689          * See SPC3 r07, page 159.
690          */
691 done:
692         lun_count *= 8;
693         buf[0] = ((lun_count >> 24) & 0xff);
694         buf[1] = ((lun_count >> 16) & 0xff);
695         buf[2] = ((lun_count >> 8) & 0xff);
696         buf[3] = (lun_count & 0xff);
697         transport_kunmap_data_sg(se_cmd);
698
699         se_task->task_scsi_status = GOOD;
700         transport_complete_task(se_task, 1);
701         return 0;
702 }
703
704 /*      se_release_device_for_hba():
705  *
706  *
707  */
708 void se_release_device_for_hba(struct se_device *dev)
709 {
710         struct se_hba *hba = dev->se_hba;
711
712         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
713             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
714             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
715             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
716             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
717                 se_dev_stop(dev);
718
719         if (dev->dev_ptr) {
720                 kthread_stop(dev->process_thread);
721                 if (dev->transport->free_device)
722                         dev->transport->free_device(dev->dev_ptr);
723         }
724
725         spin_lock(&hba->device_lock);
726         list_del(&dev->dev_list);
727         hba->dev_count--;
728         spin_unlock(&hba->device_lock);
729
730         core_scsi3_free_all_registrations(dev);
731         se_release_vpd_for_dev(dev);
732
733         kfree(dev);
734 }
735
736 void se_release_vpd_for_dev(struct se_device *dev)
737 {
738         struct t10_vpd *vpd, *vpd_tmp;
739
740         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
741         list_for_each_entry_safe(vpd, vpd_tmp,
742                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
743                 list_del(&vpd->vpd_list);
744                 kfree(vpd);
745         }
746         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
747 }
748
749 /*      se_free_virtual_device():
750  *
751  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
752  */
753 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
754 {
755         if (!list_empty(&dev->dev_sep_list))
756                 dump_stack();
757
758         core_alua_free_lu_gp_mem(dev);
759         se_release_device_for_hba(dev);
760
761         return 0;
762 }
763
764 static void se_dev_start(struct se_device *dev)
765 {
766         struct se_hba *hba = dev->se_hba;
767
768         spin_lock(&hba->device_lock);
769         atomic_inc(&dev->dev_obj.obj_access_count);
770         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
771                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
772                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
773                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
774                 } else if (dev->dev_status &
775                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
776                         dev->dev_status &=
777                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
778                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
779                 }
780         }
781         spin_unlock(&hba->device_lock);
782 }
783
784 static void se_dev_stop(struct se_device *dev)
785 {
786         struct se_hba *hba = dev->se_hba;
787
788         spin_lock(&hba->device_lock);
789         atomic_dec(&dev->dev_obj.obj_access_count);
790         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
791                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
792                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
793                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
794                 } else if (dev->dev_status &
795                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
796                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
797                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
798                 }
799         }
800         spin_unlock(&hba->device_lock);
801 }
802
803 int se_dev_check_online(struct se_device *dev)
804 {
805         unsigned long flags;
806         int ret;
807
808         spin_lock_irqsave(&dev->dev_status_lock, flags);
809         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
810                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
811         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
812
813         return ret;
814 }
815
816 int se_dev_check_shutdown(struct se_device *dev)
817 {
818         int ret;
819
820         spin_lock_irq(&dev->dev_status_lock);
821         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
822         spin_unlock_irq(&dev->dev_status_lock);
823
824         return ret;
825 }
826
827 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
828 {
829         u32 aligned_max_sectors;
830         u32 alignment;
831         /*
832          * Limit max_sectors to a PAGE_SIZE aligned value for modern
833          * transport_allocate_data_tasks() operation.
834          */
835         alignment = max(1ul, PAGE_SIZE / block_size);
836         aligned_max_sectors = rounddown(max_sectors, alignment);
837
838         if (max_sectors != aligned_max_sectors)
839                 pr_info("Rounding down aligned max_sectors from %u to %u\n",
840                         max_sectors, aligned_max_sectors);
841
842         return aligned_max_sectors;
843 }
844
845 void se_dev_set_default_attribs(
846         struct se_device *dev,
847         struct se_dev_limits *dev_limits)
848 {
849         struct queue_limits *limits = &dev_limits->limits;
850
851         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
852         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
853         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
854         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
855         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
856         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
857         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
858         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
859         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
860         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
861         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
862         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
863         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
864         /*
865          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
866          * iblock_create_virtdevice() from struct queue_limits values
867          * if blk_queue_discard()==1
868          */
869         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
870         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
871                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
872         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
873         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
874                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
875         /*
876          * block_size is based on subsystem plugin dependent requirements.
877          */
878         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
879         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
880         /*
881          * max_sectors is based on subsystem plugin dependent requirements.
882          */
883         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
884         /*
885          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
886          */
887         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
888                                                 limits->logical_block_size);
889         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
890         /*
891          * Set fabric_max_sectors, which is reported in block limits
892          * VPD page (B0h).
893          */
894         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
895         /*
896          * Set optimal_sectors from fabric_max_sectors, which can be
897          * lowered via configfs.
898          */
899         dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
900         /*
901          * queue_depth is based on subsystem plugin dependent requirements.
902          */
903         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
904         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
905 }
906
907 int se_dev_set_max_unmap_lba_count(
908         struct se_device *dev,
909         u32 max_unmap_lba_count)
910 {
911         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
912         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
913                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
914         return 0;
915 }
916
917 int se_dev_set_max_unmap_block_desc_count(
918         struct se_device *dev,
919         u32 max_unmap_block_desc_count)
920 {
921         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
922                 max_unmap_block_desc_count;
923         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
924                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
925         return 0;
926 }
927
928 int se_dev_set_unmap_granularity(
929         struct se_device *dev,
930         u32 unmap_granularity)
931 {
932         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
933         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
934                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
935         return 0;
936 }
937
938 int se_dev_set_unmap_granularity_alignment(
939         struct se_device *dev,
940         u32 unmap_granularity_alignment)
941 {
942         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
943         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
944                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
945         return 0;
946 }
947
948 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
949 {
950         if (flag != 0 && flag != 1) {
951                 pr_err("Illegal value %d\n", flag);
952                 return -EINVAL;
953         }
954
955         if (flag) {
956                 pr_err("dpo_emulated not supported\n");
957                 return -EINVAL;
958         }
959
960         return 0;
961 }
962
963 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
964 {
965         if (flag != 0 && flag != 1) {
966                 pr_err("Illegal value %d\n", flag);
967                 return -EINVAL;
968         }
969
970         if (flag && dev->transport->fua_write_emulated == 0) {
971                 pr_err("fua_write_emulated not supported\n");
972                 return -EINVAL;
973         }
974         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
975         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
976                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
977         return 0;
978 }
979
980 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
981 {
982         if (flag != 0 && flag != 1) {
983                 pr_err("Illegal value %d\n", flag);
984                 return -EINVAL;
985         }
986
987         if (flag) {
988                 pr_err("ua read emulated not supported\n");
989                 return -EINVAL;
990         }
991
992         return 0;
993 }
994
995 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
996 {
997         if (flag != 0 && flag != 1) {
998                 pr_err("Illegal value %d\n", flag);
999                 return -EINVAL;
1000         }
1001         if (flag && dev->transport->write_cache_emulated == 0) {
1002                 pr_err("write_cache_emulated not supported\n");
1003                 return -EINVAL;
1004         }
1005         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1006         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1007                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1008         return 0;
1009 }
1010
1011 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1012 {
1013         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1014                 pr_err("Illegal value %d\n", flag);
1015                 return -EINVAL;
1016         }
1017
1018         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1019                 pr_err("dev[%p]: Unable to change SE Device"
1020                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1021                         " exists\n", dev,
1022                         atomic_read(&dev->dev_export_obj.obj_access_count));
1023                 return -EINVAL;
1024         }
1025         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1026         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1027                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1028
1029         return 0;
1030 }
1031
1032 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1033 {
1034         if ((flag != 0) && (flag != 1)) {
1035                 pr_err("Illegal value %d\n", flag);
1036                 return -EINVAL;
1037         }
1038
1039         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1040                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1041                         " dev_export_obj: %d count exists\n", dev,
1042                         atomic_read(&dev->dev_export_obj.obj_access_count));
1043                 return -EINVAL;
1044         }
1045         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1046         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1047                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1048
1049         return 0;
1050 }
1051
1052 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1053 {
1054         if ((flag != 0) && (flag != 1)) {
1055                 pr_err("Illegal value %d\n", flag);
1056                 return -EINVAL;
1057         }
1058         /*
1059          * We expect this value to be non-zero when generic Block Layer
1060          * Discard supported is detected iblock_create_virtdevice().
1061          */
1062         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1063                 pr_err("Generic Block Discard not supported\n");
1064                 return -ENOSYS;
1065         }
1066
1067         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1068         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1069                                 dev, flag);
1070         return 0;
1071 }
1072
1073 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1074 {
1075         if ((flag != 0) && (flag != 1)) {
1076                 pr_err("Illegal value %d\n", flag);
1077                 return -EINVAL;
1078         }
1079         /*
1080          * We expect this value to be non-zero when generic Block Layer
1081          * Discard supported is detected iblock_create_virtdevice().
1082          */
1083         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1084                 pr_err("Generic Block Discard not supported\n");
1085                 return -ENOSYS;
1086         }
1087
1088         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1089         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1090                                 dev, flag);
1091         return 0;
1092 }
1093
1094 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1095 {
1096         if ((flag != 0) && (flag != 1)) {
1097                 pr_err("Illegal value %d\n", flag);
1098                 return -EINVAL;
1099         }
1100         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1101         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1102                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1103         return 0;
1104 }
1105
1106 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1107 {
1108         if ((flag != 0) && (flag != 1)) {
1109                 printk(KERN_ERR "Illegal value %d\n", flag);
1110                 return -EINVAL;
1111         }
1112         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1113         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1114                dev, flag);
1115         return 0;
1116 }
1117
1118 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1119 {
1120         if (flag != 0) {
1121                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1122                         " reordering not implemented\n", dev);
1123                 return -ENOSYS;
1124         }
1125         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1126         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1127         return 0;
1128 }
1129
1130 /*
1131  * Note, this can only be called on unexported SE Device Object.
1132  */
1133 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1134 {
1135         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1136                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1137                         " dev_export_obj: %d count exists\n", dev,
1138                         atomic_read(&dev->dev_export_obj.obj_access_count));
1139                 return -EINVAL;
1140         }
1141         if (!queue_depth) {
1142                 pr_err("dev[%p]: Illegal ZERO value for queue"
1143                         "_depth\n", dev);
1144                 return -EINVAL;
1145         }
1146
1147         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1148                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1149                         pr_err("dev[%p]: Passed queue_depth: %u"
1150                                 " exceeds TCM/SE_Device TCQ: %u\n",
1151                                 dev, queue_depth,
1152                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1153                         return -EINVAL;
1154                 }
1155         } else {
1156                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1157                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1158                                 pr_err("dev[%p]: Passed queue_depth:"
1159                                         " %u exceeds TCM/SE_Device MAX"
1160                                         " TCQ: %u\n", dev, queue_depth,
1161                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1162                                 return -EINVAL;
1163                         }
1164                 }
1165         }
1166
1167         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1168         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1169                         dev, queue_depth);
1170         return 0;
1171 }
1172
1173 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1174 {
1175         int force = 0; /* Force setting for VDEVS */
1176
1177         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1178                 pr_err("dev[%p]: Unable to change SE Device"
1179                         " max_sectors while dev_export_obj: %d count exists\n",
1180                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1181                 return -EINVAL;
1182         }
1183         if (!max_sectors) {
1184                 pr_err("dev[%p]: Illegal ZERO value for"
1185                         " max_sectors\n", dev);
1186                 return -EINVAL;
1187         }
1188         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1189                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1190                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1191                                 DA_STATUS_MAX_SECTORS_MIN);
1192                 return -EINVAL;
1193         }
1194         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1195                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1196                         pr_err("dev[%p]: Passed max_sectors: %u"
1197                                 " greater than TCM/SE_Device max_sectors:"
1198                                 " %u\n", dev, max_sectors,
1199                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1200                          return -EINVAL;
1201                 }
1202         } else {
1203                 if (!force && (max_sectors >
1204                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1205                         pr_err("dev[%p]: Passed max_sectors: %u"
1206                                 " greater than TCM/SE_Device max_sectors"
1207                                 ": %u, use force=1 to override.\n", dev,
1208                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1209                         return -EINVAL;
1210                 }
1211                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1212                         pr_err("dev[%p]: Passed max_sectors: %u"
1213                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1214                                 " %u\n", dev, max_sectors,
1215                                 DA_STATUS_MAX_SECTORS_MAX);
1216                         return -EINVAL;
1217                 }
1218         }
1219         /*
1220          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1221          */
1222         max_sectors = se_dev_align_max_sectors(max_sectors,
1223                                 dev->se_sub_dev->se_dev_attrib.block_size);
1224
1225         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1226         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1227                         dev, max_sectors);
1228         return 0;
1229 }
1230
1231 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1232 {
1233         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1234                 pr_err("dev[%p]: Unable to change SE Device"
1235                         " fabric_max_sectors while dev_export_obj: %d count exists\n",
1236                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1237                 return -EINVAL;
1238         }
1239         if (!fabric_max_sectors) {
1240                 pr_err("dev[%p]: Illegal ZERO value for"
1241                         " fabric_max_sectors\n", dev);
1242                 return -EINVAL;
1243         }
1244         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1245                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1246                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1247                                 DA_STATUS_MAX_SECTORS_MIN);
1248                 return -EINVAL;
1249         }
1250         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1251                 if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1252                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1253                                 " greater than TCM/SE_Device max_sectors:"
1254                                 " %u\n", dev, fabric_max_sectors,
1255                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1256                          return -EINVAL;
1257                 }
1258         } else {
1259                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1260                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1261                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1262                                 " %u\n", dev, fabric_max_sectors,
1263                                 DA_STATUS_MAX_SECTORS_MAX);
1264                         return -EINVAL;
1265                 }
1266         }
1267         /*
1268          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1269          */
1270         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1271                                                       dev->se_sub_dev->se_dev_attrib.block_size);
1272
1273         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1274         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1275                         dev, fabric_max_sectors);
1276         return 0;
1277 }
1278
1279 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1280 {
1281         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1282                 pr_err("dev[%p]: Unable to change SE Device"
1283                         " optimal_sectors while dev_export_obj: %d count exists\n",
1284                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1285                 return -EINVAL;
1286         }
1287         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1288                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1289                                 " changed for TCM/pSCSI\n", dev);
1290                 return -EINVAL;
1291         }
1292         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1293                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1294                         " greater than fabric_max_sectors: %u\n", dev,
1295                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1296                 return -EINVAL;
1297         }
1298
1299         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1300         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1301                         dev, optimal_sectors);
1302         return 0;
1303 }
1304
1305 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1306 {
1307         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1308                 pr_err("dev[%p]: Unable to change SE Device block_size"
1309                         " while dev_export_obj: %d count exists\n", dev,
1310                         atomic_read(&dev->dev_export_obj.obj_access_count));
1311                 return -EINVAL;
1312         }
1313
1314         if ((block_size != 512) &&
1315             (block_size != 1024) &&
1316             (block_size != 2048) &&
1317             (block_size != 4096)) {
1318                 pr_err("dev[%p]: Illegal value for block_device: %u"
1319                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1320                         dev, block_size);
1321                 return -EINVAL;
1322         }
1323
1324         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1325                 pr_err("dev[%p]: Not allowed to change block_size for"
1326                         " Physical Device, use for Linux/SCSI to change"
1327                         " block_size for underlying hardware\n", dev);
1328                 return -EINVAL;
1329         }
1330
1331         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1332         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1333                         dev, block_size);
1334         return 0;
1335 }
1336
1337 struct se_lun *core_dev_add_lun(
1338         struct se_portal_group *tpg,
1339         struct se_hba *hba,
1340         struct se_device *dev,
1341         u32 lun)
1342 {
1343         struct se_lun *lun_p;
1344         u32 lun_access = 0;
1345         int rc;
1346
1347         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1348                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1349                         atomic_read(&dev->dev_access_obj.obj_access_count));
1350                 return ERR_PTR(-EACCES);
1351         }
1352
1353         lun_p = core_tpg_pre_addlun(tpg, lun);
1354         if (IS_ERR(lun_p))
1355                 return lun_p;
1356
1357         if (dev->dev_flags & DF_READ_ONLY)
1358                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1359         else
1360                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1361
1362         rc = core_tpg_post_addlun(tpg, lun_p, lun_access, dev);
1363         if (rc < 0)
1364                 return ERR_PTR(rc);
1365
1366         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1367                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1368                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1369                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1370         /*
1371          * Update LUN maps for dynamically added initiators when
1372          * generate_node_acl is enabled.
1373          */
1374         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1375                 struct se_node_acl *acl;
1376                 spin_lock_irq(&tpg->acl_node_lock);
1377                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1378                         if (acl->dynamic_node_acl &&
1379                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1380                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1381                                 spin_unlock_irq(&tpg->acl_node_lock);
1382                                 core_tpg_add_node_to_devs(acl, tpg);
1383                                 spin_lock_irq(&tpg->acl_node_lock);
1384                         }
1385                 }
1386                 spin_unlock_irq(&tpg->acl_node_lock);
1387         }
1388
1389         return lun_p;
1390 }
1391
1392 /*      core_dev_del_lun():
1393  *
1394  *
1395  */
1396 int core_dev_del_lun(
1397         struct se_portal_group *tpg,
1398         u32 unpacked_lun)
1399 {
1400         struct se_lun *lun;
1401
1402         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1403         if (IS_ERR(lun))
1404                 return PTR_ERR(lun);
1405
1406         core_tpg_post_dellun(tpg, lun);
1407
1408         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1409                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1410                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1411                 tpg->se_tpg_tfo->get_fabric_name());
1412
1413         return 0;
1414 }
1415
1416 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1417 {
1418         struct se_lun *lun;
1419
1420         spin_lock(&tpg->tpg_lun_lock);
1421         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1422                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1423                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1424                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1425                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1426                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1427                 spin_unlock(&tpg->tpg_lun_lock);
1428                 return NULL;
1429         }
1430         lun = tpg->tpg_lun_list[unpacked_lun];
1431
1432         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1433                 pr_err("%s Logical Unit Number: %u is not free on"
1434                         " Target Portal Group: %hu, ignoring request.\n",
1435                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1436                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1437                 spin_unlock(&tpg->tpg_lun_lock);
1438                 return NULL;
1439         }
1440         spin_unlock(&tpg->tpg_lun_lock);
1441
1442         return lun;
1443 }
1444
1445 /*      core_dev_get_lun():
1446  *
1447  *
1448  */
1449 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1450 {
1451         struct se_lun *lun;
1452
1453         spin_lock(&tpg->tpg_lun_lock);
1454         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1455                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1456                         "_TPG-1: %u for Target Portal Group: %hu\n",
1457                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1458                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1459                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1460                 spin_unlock(&tpg->tpg_lun_lock);
1461                 return NULL;
1462         }
1463         lun = tpg->tpg_lun_list[unpacked_lun];
1464
1465         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1466                 pr_err("%s Logical Unit Number: %u is not active on"
1467                         " Target Portal Group: %hu, ignoring request.\n",
1468                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1469                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1470                 spin_unlock(&tpg->tpg_lun_lock);
1471                 return NULL;
1472         }
1473         spin_unlock(&tpg->tpg_lun_lock);
1474
1475         return lun;
1476 }
1477
1478 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1479         struct se_portal_group *tpg,
1480         u32 mapped_lun,
1481         char *initiatorname,
1482         int *ret)
1483 {
1484         struct se_lun_acl *lacl;
1485         struct se_node_acl *nacl;
1486
1487         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1488                 pr_err("%s InitiatorName exceeds maximum size.\n",
1489                         tpg->se_tpg_tfo->get_fabric_name());
1490                 *ret = -EOVERFLOW;
1491                 return NULL;
1492         }
1493         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1494         if (!nacl) {
1495                 *ret = -EINVAL;
1496                 return NULL;
1497         }
1498         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1499         if (!lacl) {
1500                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1501                 *ret = -ENOMEM;
1502                 return NULL;
1503         }
1504
1505         INIT_LIST_HEAD(&lacl->lacl_list);
1506         lacl->mapped_lun = mapped_lun;
1507         lacl->se_lun_nacl = nacl;
1508         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1509
1510         return lacl;
1511 }
1512
1513 int core_dev_add_initiator_node_lun_acl(
1514         struct se_portal_group *tpg,
1515         struct se_lun_acl *lacl,
1516         u32 unpacked_lun,
1517         u32 lun_access)
1518 {
1519         struct se_lun *lun;
1520         struct se_node_acl *nacl;
1521
1522         lun = core_dev_get_lun(tpg, unpacked_lun);
1523         if (!lun) {
1524                 pr_err("%s Logical Unit Number: %u is not active on"
1525                         " Target Portal Group: %hu, ignoring request.\n",
1526                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1527                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1528                 return -EINVAL;
1529         }
1530
1531         nacl = lacl->se_lun_nacl;
1532         if (!nacl)
1533                 return -EINVAL;
1534
1535         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1536             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1537                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1538
1539         lacl->se_lun = lun;
1540
1541         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1542                         lun_access, nacl, tpg, 1) < 0)
1543                 return -EINVAL;
1544
1545         spin_lock(&lun->lun_acl_lock);
1546         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1547         atomic_inc(&lun->lun_acl_count);
1548         smp_mb__after_atomic_inc();
1549         spin_unlock(&lun->lun_acl_lock);
1550
1551         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1552                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1553                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1554                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1555                 lacl->initiatorname);
1556         /*
1557          * Check to see if there are any existing persistent reservation APTPL
1558          * pre-registrations that need to be enabled for this LUN ACL..
1559          */
1560         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1561         return 0;
1562 }
1563
1564 /*      core_dev_del_initiator_node_lun_acl():
1565  *
1566  *
1567  */
1568 int core_dev_del_initiator_node_lun_acl(
1569         struct se_portal_group *tpg,
1570         struct se_lun *lun,
1571         struct se_lun_acl *lacl)
1572 {
1573         struct se_node_acl *nacl;
1574
1575         nacl = lacl->se_lun_nacl;
1576         if (!nacl)
1577                 return -EINVAL;
1578
1579         spin_lock(&lun->lun_acl_lock);
1580         list_del(&lacl->lacl_list);
1581         atomic_dec(&lun->lun_acl_count);
1582         smp_mb__after_atomic_dec();
1583         spin_unlock(&lun->lun_acl_lock);
1584
1585         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1586                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1587
1588         lacl->se_lun = NULL;
1589
1590         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1591                 " InitiatorNode: %s Mapped LUN: %u\n",
1592                 tpg->se_tpg_tfo->get_fabric_name(),
1593                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1594                 lacl->initiatorname, lacl->mapped_lun);
1595
1596         return 0;
1597 }
1598
1599 void core_dev_free_initiator_node_lun_acl(
1600         struct se_portal_group *tpg,
1601         struct se_lun_acl *lacl)
1602 {
1603         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1604                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1605                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1606                 tpg->se_tpg_tfo->get_fabric_name(),
1607                 lacl->initiatorname, lacl->mapped_lun);
1608
1609         kfree(lacl);
1610 }
1611
1612 int core_dev_setup_virtual_lun0(void)
1613 {
1614         struct se_hba *hba;
1615         struct se_device *dev;
1616         struct se_subsystem_dev *se_dev = NULL;
1617         struct se_subsystem_api *t;
1618         char buf[16];
1619         int ret;
1620
1621         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1622         if (IS_ERR(hba))
1623                 return PTR_ERR(hba);
1624
1625         lun0_hba = hba;
1626         t = hba->transport;
1627
1628         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1629         if (!se_dev) {
1630                 pr_err("Unable to allocate memory for"
1631                                 " struct se_subsystem_dev\n");
1632                 ret = -ENOMEM;
1633                 goto out;
1634         }
1635         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1636         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1637         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1638         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1639         spin_lock_init(&se_dev->t10_pr.registration_lock);
1640         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1641         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1642         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1643         spin_lock_init(&se_dev->se_dev_lock);
1644         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1645         se_dev->t10_wwn.t10_sub_dev = se_dev;
1646         se_dev->t10_alua.t10_sub_dev = se_dev;
1647         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1648         se_dev->se_dev_hba = hba;
1649
1650         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1651         if (!se_dev->se_dev_su_ptr) {
1652                 pr_err("Unable to locate subsystem dependent pointer"
1653                         " from allocate_virtdevice()\n");
1654                 ret = -ENOMEM;
1655                 goto out;
1656         }
1657         lun0_su_dev = se_dev;
1658
1659         memset(buf, 0, 16);
1660         sprintf(buf, "rd_pages=8");
1661         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1662
1663         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1664         if (IS_ERR(dev)) {
1665                 ret = PTR_ERR(dev);
1666                 goto out;
1667         }
1668         se_dev->se_dev_ptr = dev;
1669         g_lun0_dev = dev;
1670
1671         return 0;
1672 out:
1673         lun0_su_dev = NULL;
1674         kfree(se_dev);
1675         if (lun0_hba) {
1676                 core_delete_hba(lun0_hba);
1677                 lun0_hba = NULL;
1678         }
1679         return ret;
1680 }
1681
1682
1683 void core_dev_release_virtual_lun0(void)
1684 {
1685         struct se_hba *hba = lun0_hba;
1686         struct se_subsystem_dev *su_dev = lun0_su_dev;
1687
1688         if (!hba)
1689                 return;
1690
1691         if (g_lun0_dev)
1692                 se_free_virtual_device(g_lun0_dev, hba);
1693
1694         kfree(su_dev);
1695         core_delete_hba(hba);
1696 }