target: fix use after free in target_report_luns
[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         kfree(nacl->device_list);
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_lun *se_lun;
651         struct se_session *se_sess = se_cmd->se_sess;
652         unsigned char *buf;
653         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
654
655         buf = (unsigned char *) transport_kmap_data_sg(se_cmd);
656
657         /*
658          * If no struct se_session pointer is present, this struct se_cmd is
659          * coming via a target_core_mod PASSTHROUGH op, and not through
660          * a $FABRIC_MOD.  In that case, report LUN=0 only.
661          */
662         if (!se_sess) {
663                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
664                 lun_count = 1;
665                 goto done;
666         }
667
668         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
669         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
670                 deve = &se_sess->se_node_acl->device_list[i];
671                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
672                         continue;
673                 se_lun = deve->se_lun;
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 ((cdb_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                 cdb_offset += 8;
686         }
687         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
688
689         /*
690          * See SPC3 r07, page 159.
691          */
692 done:
693         lun_count *= 8;
694         buf[0] = ((lun_count >> 24) & 0xff);
695         buf[1] = ((lun_count >> 16) & 0xff);
696         buf[2] = ((lun_count >> 8) & 0xff);
697         buf[3] = (lun_count & 0xff);
698         transport_kunmap_data_sg(se_cmd);
699
700         se_task->task_scsi_status = GOOD;
701         transport_complete_task(se_task, 1);
702         return 0;
703 }
704
705 /*      se_release_device_for_hba():
706  *
707  *
708  */
709 void se_release_device_for_hba(struct se_device *dev)
710 {
711         struct se_hba *hba = dev->se_hba;
712
713         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
714             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
715             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
716             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
717             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
718                 se_dev_stop(dev);
719
720         if (dev->dev_ptr) {
721                 kthread_stop(dev->process_thread);
722                 if (dev->transport->free_device)
723                         dev->transport->free_device(dev->dev_ptr);
724         }
725
726         spin_lock(&hba->device_lock);
727         list_del(&dev->dev_list);
728         hba->dev_count--;
729         spin_unlock(&hba->device_lock);
730
731         core_scsi3_free_all_registrations(dev);
732         se_release_vpd_for_dev(dev);
733
734         kfree(dev);
735 }
736
737 void se_release_vpd_for_dev(struct se_device *dev)
738 {
739         struct t10_vpd *vpd, *vpd_tmp;
740
741         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
742         list_for_each_entry_safe(vpd, vpd_tmp,
743                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
744                 list_del(&vpd->vpd_list);
745                 kfree(vpd);
746         }
747         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
748 }
749
750 /*      se_free_virtual_device():
751  *
752  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
753  */
754 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
755 {
756         if (!list_empty(&dev->dev_sep_list))
757                 dump_stack();
758
759         core_alua_free_lu_gp_mem(dev);
760         se_release_device_for_hba(dev);
761
762         return 0;
763 }
764
765 static void se_dev_start(struct se_device *dev)
766 {
767         struct se_hba *hba = dev->se_hba;
768
769         spin_lock(&hba->device_lock);
770         atomic_inc(&dev->dev_obj.obj_access_count);
771         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
772                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
773                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
774                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
775                 } else if (dev->dev_status &
776                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
777                         dev->dev_status &=
778                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
779                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
780                 }
781         }
782         spin_unlock(&hba->device_lock);
783 }
784
785 static void se_dev_stop(struct se_device *dev)
786 {
787         struct se_hba *hba = dev->se_hba;
788
789         spin_lock(&hba->device_lock);
790         atomic_dec(&dev->dev_obj.obj_access_count);
791         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
792                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
793                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
794                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
795                 } else if (dev->dev_status &
796                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
797                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
798                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
799                 }
800         }
801         spin_unlock(&hba->device_lock);
802 }
803
804 int se_dev_check_online(struct se_device *dev)
805 {
806         unsigned long flags;
807         int ret;
808
809         spin_lock_irqsave(&dev->dev_status_lock, flags);
810         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
811                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
812         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
813
814         return ret;
815 }
816
817 int se_dev_check_shutdown(struct se_device *dev)
818 {
819         int ret;
820
821         spin_lock_irq(&dev->dev_status_lock);
822         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
823         spin_unlock_irq(&dev->dev_status_lock);
824
825         return ret;
826 }
827
828 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
829 {
830         u32 tmp, aligned_max_sectors;
831         /*
832          * Limit max_sectors to a PAGE_SIZE aligned value for modern
833          * transport_allocate_data_tasks() operation.
834          */
835         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
836         aligned_max_sectors = (tmp / block_size);
837         if (max_sectors != aligned_max_sectors) {
838                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
839                                 " to %u\n", max_sectors, aligned_max_sectors);
840                 return aligned_max_sectors;
841         }
842
843         return max_sectors;
844 }
845
846 void se_dev_set_default_attribs(
847         struct se_device *dev,
848         struct se_dev_limits *dev_limits)
849 {
850         struct queue_limits *limits = &dev_limits->limits;
851
852         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
853         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
854         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
855         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
856         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
857         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
858         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
859         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
860         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
861         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
862         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
863         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
864         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
865         /*
866          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
867          * iblock_create_virtdevice() from struct queue_limits values
868          * if blk_queue_discard()==1
869          */
870         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
871         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
872                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
873         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
874         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
875                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
876         /*
877          * block_size is based on subsystem plugin dependent requirements.
878          */
879         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
880         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
881         /*
882          * max_sectors is based on subsystem plugin dependent requirements.
883          */
884         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
885         /*
886          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
887          */
888         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
889                                                 limits->logical_block_size);
890         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
891         /*
892          * Set fabric_max_sectors, which is reported in block limits
893          * VPD page (B0h).
894          */
895         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
896         /*
897          * Set optimal_sectors from fabric_max_sectors, which can be
898          * lowered via configfs.
899          */
900         dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
901         /*
902          * queue_depth is based on subsystem plugin dependent requirements.
903          */
904         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
905         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
906 }
907
908 int se_dev_set_max_unmap_lba_count(
909         struct se_device *dev,
910         u32 max_unmap_lba_count)
911 {
912         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
913         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
914                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
915         return 0;
916 }
917
918 int se_dev_set_max_unmap_block_desc_count(
919         struct se_device *dev,
920         u32 max_unmap_block_desc_count)
921 {
922         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
923                 max_unmap_block_desc_count;
924         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
925                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
926         return 0;
927 }
928
929 int se_dev_set_unmap_granularity(
930         struct se_device *dev,
931         u32 unmap_granularity)
932 {
933         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
934         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
935                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
936         return 0;
937 }
938
939 int se_dev_set_unmap_granularity_alignment(
940         struct se_device *dev,
941         u32 unmap_granularity_alignment)
942 {
943         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
944         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
945                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
946         return 0;
947 }
948
949 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
950 {
951         if (flag != 0 && flag != 1) {
952                 pr_err("Illegal value %d\n", flag);
953                 return -EINVAL;
954         }
955
956         if (flag) {
957                 pr_err("dpo_emulated not supported\n");
958                 return -EINVAL;
959         }
960
961         return 0;
962 }
963
964 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
965 {
966         if (flag != 0 && flag != 1) {
967                 pr_err("Illegal value %d\n", flag);
968                 return -EINVAL;
969         }
970
971         if (flag && dev->transport->fua_write_emulated == 0) {
972                 pr_err("fua_write_emulated not supported\n");
973                 return -EINVAL;
974         }
975         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
976         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
977                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
978         return 0;
979 }
980
981 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
982 {
983         if (flag != 0 && flag != 1) {
984                 pr_err("Illegal value %d\n", flag);
985                 return -EINVAL;
986         }
987
988         if (flag) {
989                 pr_err("ua read emulated not supported\n");
990                 return -EINVAL;
991         }
992
993         return 0;
994 }
995
996 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
997 {
998         if (flag != 0 && flag != 1) {
999                 pr_err("Illegal value %d\n", flag);
1000                 return -EINVAL;
1001         }
1002         if (flag && dev->transport->write_cache_emulated == 0) {
1003                 pr_err("write_cache_emulated not supported\n");
1004                 return -EINVAL;
1005         }
1006         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1007         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1008                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1009         return 0;
1010 }
1011
1012 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1013 {
1014         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1015                 pr_err("Illegal value %d\n", flag);
1016                 return -EINVAL;
1017         }
1018
1019         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1020                 pr_err("dev[%p]: Unable to change SE Device"
1021                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1022                         " exists\n", dev,
1023                         atomic_read(&dev->dev_export_obj.obj_access_count));
1024                 return -EINVAL;
1025         }
1026         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1027         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1028                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1029
1030         return 0;
1031 }
1032
1033 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1034 {
1035         if ((flag != 0) && (flag != 1)) {
1036                 pr_err("Illegal value %d\n", flag);
1037                 return -EINVAL;
1038         }
1039
1040         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1041                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1042                         " dev_export_obj: %d count exists\n", dev,
1043                         atomic_read(&dev->dev_export_obj.obj_access_count));
1044                 return -EINVAL;
1045         }
1046         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1047         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1048                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1049
1050         return 0;
1051 }
1052
1053 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1054 {
1055         if ((flag != 0) && (flag != 1)) {
1056                 pr_err("Illegal value %d\n", flag);
1057                 return -EINVAL;
1058         }
1059         /*
1060          * We expect this value to be non-zero when generic Block Layer
1061          * Discard supported is detected iblock_create_virtdevice().
1062          */
1063         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1064                 pr_err("Generic Block Discard not supported\n");
1065                 return -ENOSYS;
1066         }
1067
1068         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1069         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1070                                 dev, flag);
1071         return 0;
1072 }
1073
1074 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1075 {
1076         if ((flag != 0) && (flag != 1)) {
1077                 pr_err("Illegal value %d\n", flag);
1078                 return -EINVAL;
1079         }
1080         /*
1081          * We expect this value to be non-zero when generic Block Layer
1082          * Discard supported is detected iblock_create_virtdevice().
1083          */
1084         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1085                 pr_err("Generic Block Discard not supported\n");
1086                 return -ENOSYS;
1087         }
1088
1089         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1090         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1091                                 dev, flag);
1092         return 0;
1093 }
1094
1095 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1096 {
1097         if ((flag != 0) && (flag != 1)) {
1098                 pr_err("Illegal value %d\n", flag);
1099                 return -EINVAL;
1100         }
1101         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1102         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1103                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1104         return 0;
1105 }
1106
1107 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1108 {
1109         if ((flag != 0) && (flag != 1)) {
1110                 printk(KERN_ERR "Illegal value %d\n", flag);
1111                 return -EINVAL;
1112         }
1113         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1114         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1115                dev, flag);
1116         return 0;
1117 }
1118
1119 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1120 {
1121         if (flag != 0) {
1122                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1123                         " reordering not implemented\n", dev);
1124                 return -ENOSYS;
1125         }
1126         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1127         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1128         return 0;
1129 }
1130
1131 /*
1132  * Note, this can only be called on unexported SE Device Object.
1133  */
1134 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1135 {
1136         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1137                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1138                         " dev_export_obj: %d count exists\n", dev,
1139                         atomic_read(&dev->dev_export_obj.obj_access_count));
1140                 return -EINVAL;
1141         }
1142         if (!queue_depth) {
1143                 pr_err("dev[%p]: Illegal ZERO value for queue"
1144                         "_depth\n", dev);
1145                 return -EINVAL;
1146         }
1147
1148         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1149                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1150                         pr_err("dev[%p]: Passed queue_depth: %u"
1151                                 " exceeds TCM/SE_Device TCQ: %u\n",
1152                                 dev, queue_depth,
1153                                 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1154                         return -EINVAL;
1155                 }
1156         } else {
1157                 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1158                         if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1159                                 pr_err("dev[%p]: Passed queue_depth:"
1160                                         " %u exceeds TCM/SE_Device MAX"
1161                                         " TCQ: %u\n", dev, queue_depth,
1162                                         dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1163                                 return -EINVAL;
1164                         }
1165                 }
1166         }
1167
1168         dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1169         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1170                         dev, queue_depth);
1171         return 0;
1172 }
1173
1174 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1175 {
1176         int force = 0; /* Force setting for VDEVS */
1177
1178         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1179                 pr_err("dev[%p]: Unable to change SE Device"
1180                         " max_sectors while dev_export_obj: %d count exists\n",
1181                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1182                 return -EINVAL;
1183         }
1184         if (!max_sectors) {
1185                 pr_err("dev[%p]: Illegal ZERO value for"
1186                         " max_sectors\n", dev);
1187                 return -EINVAL;
1188         }
1189         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1190                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1191                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1192                                 DA_STATUS_MAX_SECTORS_MIN);
1193                 return -EINVAL;
1194         }
1195         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1196                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1197                         pr_err("dev[%p]: Passed max_sectors: %u"
1198                                 " greater than TCM/SE_Device max_sectors:"
1199                                 " %u\n", dev, max_sectors,
1200                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1201                          return -EINVAL;
1202                 }
1203         } else {
1204                 if (!force && (max_sectors >
1205                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1206                         pr_err("dev[%p]: Passed max_sectors: %u"
1207                                 " greater than TCM/SE_Device max_sectors"
1208                                 ": %u, use force=1 to override.\n", dev,
1209                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1210                         return -EINVAL;
1211                 }
1212                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1213                         pr_err("dev[%p]: Passed max_sectors: %u"
1214                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1215                                 " %u\n", dev, max_sectors,
1216                                 DA_STATUS_MAX_SECTORS_MAX);
1217                         return -EINVAL;
1218                 }
1219         }
1220         /*
1221          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1222          */
1223         max_sectors = se_dev_align_max_sectors(max_sectors,
1224                                 dev->se_sub_dev->se_dev_attrib.block_size);
1225
1226         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1227         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1228                         dev, max_sectors);
1229         return 0;
1230 }
1231
1232 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1233 {
1234         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1235                 pr_err("dev[%p]: Unable to change SE Device"
1236                         " fabric_max_sectors while dev_export_obj: %d count exists\n",
1237                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1238                 return -EINVAL;
1239         }
1240         if (!fabric_max_sectors) {
1241                 pr_err("dev[%p]: Illegal ZERO value for"
1242                         " fabric_max_sectors\n", dev);
1243                 return -EINVAL;
1244         }
1245         if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1246                 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1247                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1248                                 DA_STATUS_MAX_SECTORS_MIN);
1249                 return -EINVAL;
1250         }
1251         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1252                 if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1253                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1254                                 " greater than TCM/SE_Device max_sectors:"
1255                                 " %u\n", dev, fabric_max_sectors,
1256                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1257                          return -EINVAL;
1258                 }
1259         } else {
1260                 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1261                         pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1262                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1263                                 " %u\n", dev, fabric_max_sectors,
1264                                 DA_STATUS_MAX_SECTORS_MAX);
1265                         return -EINVAL;
1266                 }
1267         }
1268         /*
1269          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1270          */
1271         fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1272                                                       dev->se_sub_dev->se_dev_attrib.block_size);
1273
1274         dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1275         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1276                         dev, fabric_max_sectors);
1277         return 0;
1278 }
1279
1280 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1281 {
1282         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1283                 pr_err("dev[%p]: Unable to change SE Device"
1284                         " optimal_sectors while dev_export_obj: %d count exists\n",
1285                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1286                 return -EINVAL;
1287         }
1288         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1289                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1290                                 " changed for TCM/pSCSI\n", dev);
1291                 return -EINVAL;
1292         }
1293         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1294                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1295                         " greater than fabric_max_sectors: %u\n", dev,
1296                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1297                 return -EINVAL;
1298         }
1299
1300         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1301         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1302                         dev, optimal_sectors);
1303         return 0;
1304 }
1305
1306 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1307 {
1308         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1309                 pr_err("dev[%p]: Unable to change SE Device block_size"
1310                         " while dev_export_obj: %d count exists\n", dev,
1311                         atomic_read(&dev->dev_export_obj.obj_access_count));
1312                 return -EINVAL;
1313         }
1314
1315         if ((block_size != 512) &&
1316             (block_size != 1024) &&
1317             (block_size != 2048) &&
1318             (block_size != 4096)) {
1319                 pr_err("dev[%p]: Illegal value for block_device: %u"
1320                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1321                         dev, block_size);
1322                 return -EINVAL;
1323         }
1324
1325         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1326                 pr_err("dev[%p]: Not allowed to change block_size for"
1327                         " Physical Device, use for Linux/SCSI to change"
1328                         " block_size for underlying hardware\n", dev);
1329                 return -EINVAL;
1330         }
1331
1332         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1333         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1334                         dev, block_size);
1335         return 0;
1336 }
1337
1338 struct se_lun *core_dev_add_lun(
1339         struct se_portal_group *tpg,
1340         struct se_hba *hba,
1341         struct se_device *dev,
1342         u32 lun)
1343 {
1344         struct se_lun *lun_p;
1345         u32 lun_access = 0;
1346         int rc;
1347
1348         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1349                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1350                         atomic_read(&dev->dev_access_obj.obj_access_count));
1351                 return ERR_PTR(-EACCES);
1352         }
1353
1354         lun_p = core_tpg_pre_addlun(tpg, lun);
1355         if (IS_ERR(lun_p))
1356                 return lun_p;
1357
1358         if (dev->dev_flags & DF_READ_ONLY)
1359                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1360         else
1361                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1362
1363         rc = core_tpg_post_addlun(tpg, lun_p, lun_access, dev);
1364         if (rc < 0)
1365                 return ERR_PTR(rc);
1366
1367         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1368                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1369                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1370                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1371         /*
1372          * Update LUN maps for dynamically added initiators when
1373          * generate_node_acl is enabled.
1374          */
1375         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1376                 struct se_node_acl *acl;
1377                 spin_lock_irq(&tpg->acl_node_lock);
1378                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1379                         if (acl->dynamic_node_acl &&
1380                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1381                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1382                                 spin_unlock_irq(&tpg->acl_node_lock);
1383                                 core_tpg_add_node_to_devs(acl, tpg);
1384                                 spin_lock_irq(&tpg->acl_node_lock);
1385                         }
1386                 }
1387                 spin_unlock_irq(&tpg->acl_node_lock);
1388         }
1389
1390         return lun_p;
1391 }
1392
1393 /*      core_dev_del_lun():
1394  *
1395  *
1396  */
1397 int core_dev_del_lun(
1398         struct se_portal_group *tpg,
1399         u32 unpacked_lun)
1400 {
1401         struct se_lun *lun;
1402
1403         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1404         if (IS_ERR(lun))
1405                 return PTR_ERR(lun);
1406
1407         core_tpg_post_dellun(tpg, lun);
1408
1409         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1410                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1411                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1412                 tpg->se_tpg_tfo->get_fabric_name());
1413
1414         return 0;
1415 }
1416
1417 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1418 {
1419         struct se_lun *lun;
1420
1421         spin_lock(&tpg->tpg_lun_lock);
1422         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1423                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1424                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1425                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1426                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1427                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1428                 spin_unlock(&tpg->tpg_lun_lock);
1429                 return NULL;
1430         }
1431         lun = &tpg->tpg_lun_list[unpacked_lun];
1432
1433         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1434                 pr_err("%s Logical Unit Number: %u is not free on"
1435                         " Target Portal Group: %hu, ignoring request.\n",
1436                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1437                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1438                 spin_unlock(&tpg->tpg_lun_lock);
1439                 return NULL;
1440         }
1441         spin_unlock(&tpg->tpg_lun_lock);
1442
1443         return lun;
1444 }
1445
1446 /*      core_dev_get_lun():
1447  *
1448  *
1449  */
1450 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1451 {
1452         struct se_lun *lun;
1453
1454         spin_lock(&tpg->tpg_lun_lock);
1455         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1456                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1457                         "_TPG-1: %u for Target Portal Group: %hu\n",
1458                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1459                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1460                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1461                 spin_unlock(&tpg->tpg_lun_lock);
1462                 return NULL;
1463         }
1464         lun = &tpg->tpg_lun_list[unpacked_lun];
1465
1466         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1467                 pr_err("%s Logical Unit Number: %u is not active on"
1468                         " Target Portal Group: %hu, ignoring request.\n",
1469                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1470                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1471                 spin_unlock(&tpg->tpg_lun_lock);
1472                 return NULL;
1473         }
1474         spin_unlock(&tpg->tpg_lun_lock);
1475
1476         return lun;
1477 }
1478
1479 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1480         struct se_portal_group *tpg,
1481         u32 mapped_lun,
1482         char *initiatorname,
1483         int *ret)
1484 {
1485         struct se_lun_acl *lacl;
1486         struct se_node_acl *nacl;
1487
1488         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1489                 pr_err("%s InitiatorName exceeds maximum size.\n",
1490                         tpg->se_tpg_tfo->get_fabric_name());
1491                 *ret = -EOVERFLOW;
1492                 return NULL;
1493         }
1494         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1495         if (!nacl) {
1496                 *ret = -EINVAL;
1497                 return NULL;
1498         }
1499         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1500         if (!lacl) {
1501                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1502                 *ret = -ENOMEM;
1503                 return NULL;
1504         }
1505
1506         INIT_LIST_HEAD(&lacl->lacl_list);
1507         lacl->mapped_lun = mapped_lun;
1508         lacl->se_lun_nacl = nacl;
1509         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1510
1511         return lacl;
1512 }
1513
1514 int core_dev_add_initiator_node_lun_acl(
1515         struct se_portal_group *tpg,
1516         struct se_lun_acl *lacl,
1517         u32 unpacked_lun,
1518         u32 lun_access)
1519 {
1520         struct se_lun *lun;
1521         struct se_node_acl *nacl;
1522
1523         lun = core_dev_get_lun(tpg, unpacked_lun);
1524         if (!lun) {
1525                 pr_err("%s Logical Unit Number: %u is not active on"
1526                         " Target Portal Group: %hu, ignoring request.\n",
1527                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1528                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1529                 return -EINVAL;
1530         }
1531
1532         nacl = lacl->se_lun_nacl;
1533         if (!nacl)
1534                 return -EINVAL;
1535
1536         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1537             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1538                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1539
1540         lacl->se_lun = lun;
1541
1542         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1543                         lun_access, nacl, tpg, 1) < 0)
1544                 return -EINVAL;
1545
1546         spin_lock(&lun->lun_acl_lock);
1547         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1548         atomic_inc(&lun->lun_acl_count);
1549         smp_mb__after_atomic_inc();
1550         spin_unlock(&lun->lun_acl_lock);
1551
1552         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1553                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1554                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1555                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1556                 lacl->initiatorname);
1557         /*
1558          * Check to see if there are any existing persistent reservation APTPL
1559          * pre-registrations that need to be enabled for this LUN ACL..
1560          */
1561         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1562         return 0;
1563 }
1564
1565 /*      core_dev_del_initiator_node_lun_acl():
1566  *
1567  *
1568  */
1569 int core_dev_del_initiator_node_lun_acl(
1570         struct se_portal_group *tpg,
1571         struct se_lun *lun,
1572         struct se_lun_acl *lacl)
1573 {
1574         struct se_node_acl *nacl;
1575
1576         nacl = lacl->se_lun_nacl;
1577         if (!nacl)
1578                 return -EINVAL;
1579
1580         spin_lock(&lun->lun_acl_lock);
1581         list_del(&lacl->lacl_list);
1582         atomic_dec(&lun->lun_acl_count);
1583         smp_mb__after_atomic_dec();
1584         spin_unlock(&lun->lun_acl_lock);
1585
1586         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1587                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1588
1589         lacl->se_lun = NULL;
1590
1591         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1592                 " InitiatorNode: %s Mapped LUN: %u\n",
1593                 tpg->se_tpg_tfo->get_fabric_name(),
1594                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1595                 lacl->initiatorname, lacl->mapped_lun);
1596
1597         return 0;
1598 }
1599
1600 void core_dev_free_initiator_node_lun_acl(
1601         struct se_portal_group *tpg,
1602         struct se_lun_acl *lacl)
1603 {
1604         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1605                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1606                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1607                 tpg->se_tpg_tfo->get_fabric_name(),
1608                 lacl->initiatorname, lacl->mapped_lun);
1609
1610         kfree(lacl);
1611 }
1612
1613 int core_dev_setup_virtual_lun0(void)
1614 {
1615         struct se_hba *hba;
1616         struct se_device *dev;
1617         struct se_subsystem_dev *se_dev = NULL;
1618         struct se_subsystem_api *t;
1619         char buf[16];
1620         int ret;
1621
1622         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1623         if (IS_ERR(hba))
1624                 return PTR_ERR(hba);
1625
1626         lun0_hba = hba;
1627         t = hba->transport;
1628
1629         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1630         if (!se_dev) {
1631                 pr_err("Unable to allocate memory for"
1632                                 " struct se_subsystem_dev\n");
1633                 ret = -ENOMEM;
1634                 goto out;
1635         }
1636         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1637         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1638         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1639         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1640         spin_lock_init(&se_dev->t10_pr.registration_lock);
1641         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1642         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1643         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1644         spin_lock_init(&se_dev->se_dev_lock);
1645         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1646         se_dev->t10_wwn.t10_sub_dev = se_dev;
1647         se_dev->t10_alua.t10_sub_dev = se_dev;
1648         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1649         se_dev->se_dev_hba = hba;
1650
1651         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1652         if (!se_dev->se_dev_su_ptr) {
1653                 pr_err("Unable to locate subsystem dependent pointer"
1654                         " from allocate_virtdevice()\n");
1655                 ret = -ENOMEM;
1656                 goto out;
1657         }
1658         lun0_su_dev = se_dev;
1659
1660         memset(buf, 0, 16);
1661         sprintf(buf, "rd_pages=8");
1662         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1663
1664         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1665         if (IS_ERR(dev)) {
1666                 ret = PTR_ERR(dev);
1667                 goto out;
1668         }
1669         se_dev->se_dev_ptr = dev;
1670         g_lun0_dev = dev;
1671
1672         return 0;
1673 out:
1674         lun0_su_dev = NULL;
1675         kfree(se_dev);
1676         if (lun0_hba) {
1677                 core_delete_hba(lun0_hba);
1678                 lun0_hba = NULL;
1679         }
1680         return ret;
1681 }
1682
1683
1684 void core_dev_release_virtual_lun0(void)
1685 {
1686         struct se_hba *hba = lun0_hba;
1687         struct se_subsystem_dev *su_dev = lun0_su_dev;
1688
1689         if (!hba)
1690                 return;
1691
1692         if (g_lun0_dev)
1693                 se_free_virtual_device(g_lun0_dev, hba);
1694
1695         kfree(su_dev);
1696         core_delete_hba(hba);
1697 }