edbcabbf85f7339d1eddef7d618b26181540cd5a
[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         /*
163          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
164          * for tracking state of struct se_cmds during LUN shutdown events.
165          */
166         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
167         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
168         atomic_set(&se_cmd->transport_lun_active, 1);
169         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
170
171         return 0;
172 }
173 EXPORT_SYMBOL(transport_lookup_cmd_lun);
174
175 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
176 {
177         struct se_dev_entry *deve;
178         struct se_lun *se_lun = NULL;
179         struct se_session *se_sess = se_cmd->se_sess;
180         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
181         unsigned long flags;
182
183         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
184                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
185                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
186                 return -ENODEV;
187         }
188
189         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
190         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
191         deve = se_cmd->se_deve;
192
193         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
194                 se_tmr->tmr_lun = deve->se_lun;
195                 se_cmd->se_lun = deve->se_lun;
196                 se_lun = deve->se_lun;
197                 se_cmd->pr_res_key = deve->pr_res_key;
198                 se_cmd->orig_fe_lun = unpacked_lun;
199         }
200         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
201
202         if (!se_lun) {
203                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
204                         " Access for 0x%08x\n",
205                         se_cmd->se_tfo->get_fabric_name(),
206                         unpacked_lun);
207                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
208                 return -ENODEV;
209         }
210         /*
211          * Determine if the struct se_lun is online.
212          * FIXME: Check for LUN_RESET + UNIT Attention
213          */
214         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
215                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
216                 return -ENODEV;
217         }
218
219         /* Directly associate cmd with se_dev */
220         se_cmd->se_dev = se_lun->lun_se_dev;
221         se_tmr->tmr_dev = se_lun->lun_se_dev;
222
223         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
224         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
225         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
226
227         return 0;
228 }
229 EXPORT_SYMBOL(transport_lookup_tmr_lun);
230
231 /*
232  * This function is called from core_scsi3_emulate_pro_register_and_move()
233  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
234  * when a matching rtpi is found.
235  */
236 struct se_dev_entry *core_get_se_deve_from_rtpi(
237         struct se_node_acl *nacl,
238         u16 rtpi)
239 {
240         struct se_dev_entry *deve;
241         struct se_lun *lun;
242         struct se_port *port;
243         struct se_portal_group *tpg = nacl->se_tpg;
244         u32 i;
245
246         spin_lock_irq(&nacl->device_list_lock);
247         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
248                 deve = &nacl->device_list[i];
249
250                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
251                         continue;
252
253                 lun = deve->se_lun;
254                 if (!lun) {
255                         pr_err("%s device entries device pointer is"
256                                 " NULL, but Initiator has access.\n",
257                                 tpg->se_tpg_tfo->get_fabric_name());
258                         continue;
259                 }
260                 port = lun->lun_sep;
261                 if (!port) {
262                         pr_err("%s device entries device pointer is"
263                                 " NULL, but Initiator has access.\n",
264                                 tpg->se_tpg_tfo->get_fabric_name());
265                         continue;
266                 }
267                 if (port->sep_rtpi != rtpi)
268                         continue;
269
270                 atomic_inc(&deve->pr_ref_count);
271                 smp_mb__after_atomic_inc();
272                 spin_unlock_irq(&nacl->device_list_lock);
273
274                 return deve;
275         }
276         spin_unlock_irq(&nacl->device_list_lock);
277
278         return NULL;
279 }
280
281 int core_free_device_list_for_node(
282         struct se_node_acl *nacl,
283         struct se_portal_group *tpg)
284 {
285         struct se_dev_entry *deve;
286         struct se_lun *lun;
287         u32 i;
288
289         if (!nacl->device_list)
290                 return 0;
291
292         spin_lock_irq(&nacl->device_list_lock);
293         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
294                 deve = &nacl->device_list[i];
295
296                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
297                         continue;
298
299                 if (!deve->se_lun) {
300                         pr_err("%s device entries device pointer is"
301                                 " NULL, but Initiator has access.\n",
302                                 tpg->se_tpg_tfo->get_fabric_name());
303                         continue;
304                 }
305                 lun = deve->se_lun;
306
307                 spin_unlock_irq(&nacl->device_list_lock);
308                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
309                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
310                 spin_lock_irq(&nacl->device_list_lock);
311         }
312         spin_unlock_irq(&nacl->device_list_lock);
313
314         kfree(nacl->device_list);
315         nacl->device_list = NULL;
316
317         return 0;
318 }
319
320 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
321 {
322         struct se_dev_entry *deve;
323         unsigned long flags;
324
325         spin_lock_irqsave(&se_nacl->device_list_lock, flags);
326         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
327         deve->deve_cmds--;
328         spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
329 }
330
331 void core_update_device_list_access(
332         u32 mapped_lun,
333         u32 lun_access,
334         struct se_node_acl *nacl)
335 {
336         struct se_dev_entry *deve;
337
338         spin_lock_irq(&nacl->device_list_lock);
339         deve = &nacl->device_list[mapped_lun];
340         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
341                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
342                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
343         } else {
344                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
345                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
346         }
347         spin_unlock_irq(&nacl->device_list_lock);
348 }
349
350 /*      core_update_device_list_for_node():
351  *
352  *
353  */
354 int core_update_device_list_for_node(
355         struct se_lun *lun,
356         struct se_lun_acl *lun_acl,
357         u32 mapped_lun,
358         u32 lun_access,
359         struct se_node_acl *nacl,
360         struct se_portal_group *tpg,
361         int enable)
362 {
363         struct se_port *port = lun->lun_sep;
364         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
365         int trans = 0;
366         /*
367          * If the MappedLUN entry is being disabled, the entry in
368          * port->sep_alua_list must be removed now before clearing the
369          * struct se_dev_entry pointers below as logic in
370          * core_alua_do_transition_tg_pt() depends on these being present.
371          */
372         if (!enable) {
373                 /*
374                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
375                  * that have not been explicitly concerted to MappedLUNs ->
376                  * struct se_lun_acl, but we remove deve->alua_port_list from
377                  * port->sep_alua_list. This also means that active UAs and
378                  * NodeACL context specific PR metadata for demo-mode
379                  * MappedLUN *deve will be released below..
380                  */
381                 spin_lock_bh(&port->sep_alua_lock);
382                 list_del(&deve->alua_port_list);
383                 spin_unlock_bh(&port->sep_alua_lock);
384         }
385
386         spin_lock_irq(&nacl->device_list_lock);
387         if (enable) {
388                 /*
389                  * Check if the call is handling demo mode -> explict LUN ACL
390                  * transition.  This transition must be for the same struct se_lun
391                  * + mapped_lun that was setup in demo mode..
392                  */
393                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
394                         if (deve->se_lun_acl != NULL) {
395                                 pr_err("struct se_dev_entry->se_lun_acl"
396                                         " already set for demo mode -> explict"
397                                         " LUN ACL transition\n");
398                                 spin_unlock_irq(&nacl->device_list_lock);
399                                 return -EINVAL;
400                         }
401                         if (deve->se_lun != lun) {
402                                 pr_err("struct se_dev_entry->se_lun does"
403                                         " match passed struct se_lun for demo mode"
404                                         " -> explict LUN ACL transition\n");
405                                 spin_unlock_irq(&nacl->device_list_lock);
406                                 return -EINVAL;
407                         }
408                         deve->se_lun_acl = lun_acl;
409                         trans = 1;
410                 } else {
411                         deve->se_lun = lun;
412                         deve->se_lun_acl = lun_acl;
413                         deve->mapped_lun = mapped_lun;
414                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
415                 }
416
417                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
418                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
419                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
420                 } else {
421                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
422                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
423                 }
424
425                 if (trans) {
426                         spin_unlock_irq(&nacl->device_list_lock);
427                         return 0;
428                 }
429                 deve->creation_time = get_jiffies_64();
430                 deve->attach_count++;
431                 spin_unlock_irq(&nacl->device_list_lock);
432
433                 spin_lock_bh(&port->sep_alua_lock);
434                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
435                 spin_unlock_bh(&port->sep_alua_lock);
436
437                 return 0;
438         }
439         /*
440          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
441          * PR operation to complete.
442          */
443         spin_unlock_irq(&nacl->device_list_lock);
444         while (atomic_read(&deve->pr_ref_count) != 0)
445                 cpu_relax();
446         spin_lock_irq(&nacl->device_list_lock);
447         /*
448          * Disable struct se_dev_entry LUN ACL mapping
449          */
450         core_scsi3_ua_release_all(deve);
451         deve->se_lun = NULL;
452         deve->se_lun_acl = NULL;
453         deve->lun_flags = 0;
454         deve->creation_time = 0;
455         deve->attach_count--;
456         spin_unlock_irq(&nacl->device_list_lock);
457
458         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
459         return 0;
460 }
461
462 /*      core_clear_lun_from_tpg():
463  *
464  *
465  */
466 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
467 {
468         struct se_node_acl *nacl;
469         struct se_dev_entry *deve;
470         u32 i;
471
472         spin_lock_irq(&tpg->acl_node_lock);
473         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
474                 spin_unlock_irq(&tpg->acl_node_lock);
475
476                 spin_lock_irq(&nacl->device_list_lock);
477                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
478                         deve = &nacl->device_list[i];
479                         if (lun != deve->se_lun)
480                                 continue;
481                         spin_unlock_irq(&nacl->device_list_lock);
482
483                         core_update_device_list_for_node(lun, NULL,
484                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
485                                 nacl, tpg, 0);
486
487                         spin_lock_irq(&nacl->device_list_lock);
488                 }
489                 spin_unlock_irq(&nacl->device_list_lock);
490
491                 spin_lock_irq(&tpg->acl_node_lock);
492         }
493         spin_unlock_irq(&tpg->acl_node_lock);
494 }
495
496 static struct se_port *core_alloc_port(struct se_device *dev)
497 {
498         struct se_port *port, *port_tmp;
499
500         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
501         if (!port) {
502                 pr_err("Unable to allocate struct se_port\n");
503                 return ERR_PTR(-ENOMEM);
504         }
505         INIT_LIST_HEAD(&port->sep_alua_list);
506         INIT_LIST_HEAD(&port->sep_list);
507         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
508         spin_lock_init(&port->sep_alua_lock);
509         mutex_init(&port->sep_tg_pt_md_mutex);
510
511         spin_lock(&dev->se_port_lock);
512         if (dev->dev_port_count == 0x0000ffff) {
513                 pr_warn("Reached dev->dev_port_count =="
514                                 " 0x0000ffff\n");
515                 spin_unlock(&dev->se_port_lock);
516                 return ERR_PTR(-ENOSPC);
517         }
518 again:
519         /*
520          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
521          * Here is the table from spc4r17 section 7.7.3.8.
522          *
523          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
524          *
525          * Code      Description
526          * 0h        Reserved
527          * 1h        Relative port 1, historically known as port A
528          * 2h        Relative port 2, historically known as port B
529          * 3h to FFFFh    Relative port 3 through 65 535
530          */
531         port->sep_rtpi = dev->dev_rpti_counter++;
532         if (!port->sep_rtpi)
533                 goto again;
534
535         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
536                 /*
537                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
538                  * for 16-bit wrap..
539                  */
540                 if (port->sep_rtpi == port_tmp->sep_rtpi)
541                         goto again;
542         }
543         spin_unlock(&dev->se_port_lock);
544
545         return port;
546 }
547
548 static void core_export_port(
549         struct se_device *dev,
550         struct se_portal_group *tpg,
551         struct se_port *port,
552         struct se_lun *lun)
553 {
554         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
555         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
556
557         spin_lock(&dev->se_port_lock);
558         spin_lock(&lun->lun_sep_lock);
559         port->sep_tpg = tpg;
560         port->sep_lun = lun;
561         lun->lun_sep = port;
562         spin_unlock(&lun->lun_sep_lock);
563
564         list_add_tail(&port->sep_list, &dev->dev_sep_list);
565         spin_unlock(&dev->se_port_lock);
566
567         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
568                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
569                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
570                         pr_err("Unable to allocate t10_alua_tg_pt"
571                                         "_gp_member_t\n");
572                         return;
573                 }
574                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
575                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
576                         su_dev->t10_alua.default_tg_pt_gp);
577                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
578                 pr_debug("%s/%s: Adding to default ALUA Target Port"
579                         " Group: alua/default_tg_pt_gp\n",
580                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
581         }
582
583         dev->dev_port_count++;
584         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
585 }
586
587 /*
588  *      Called with struct se_device->se_port_lock spinlock held.
589  */
590 static void core_release_port(struct se_device *dev, struct se_port *port)
591         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
592 {
593         /*
594          * Wait for any port reference for PR ALL_TG_PT=1 operation
595          * to complete in __core_scsi3_alloc_registration()
596          */
597         spin_unlock(&dev->se_port_lock);
598         if (atomic_read(&port->sep_tg_pt_ref_cnt))
599                 cpu_relax();
600         spin_lock(&dev->se_port_lock);
601
602         core_alua_free_tg_pt_gp_mem(port);
603
604         list_del(&port->sep_list);
605         dev->dev_port_count--;
606         kfree(port);
607 }
608
609 int core_dev_export(
610         struct se_device *dev,
611         struct se_portal_group *tpg,
612         struct se_lun *lun)
613 {
614         struct se_port *port;
615
616         port = core_alloc_port(dev);
617         if (IS_ERR(port))
618                 return PTR_ERR(port);
619
620         lun->lun_se_dev = dev;
621         se_dev_start(dev);
622
623         atomic_inc(&dev->dev_export_obj.obj_access_count);
624         core_export_port(dev, tpg, port, lun);
625         return 0;
626 }
627
628 void core_dev_unexport(
629         struct se_device *dev,
630         struct se_portal_group *tpg,
631         struct se_lun *lun)
632 {
633         struct se_port *port = lun->lun_sep;
634
635         spin_lock(&lun->lun_sep_lock);
636         if (lun->lun_se_dev == NULL) {
637                 spin_unlock(&lun->lun_sep_lock);
638                 return;
639         }
640         spin_unlock(&lun->lun_sep_lock);
641
642         spin_lock(&dev->se_port_lock);
643         atomic_dec(&dev->dev_export_obj.obj_access_count);
644         core_release_port(dev, port);
645         spin_unlock(&dev->se_port_lock);
646
647         se_dev_stop(dev);
648         lun->lun_se_dev = NULL;
649 }
650
651 int target_report_luns(struct se_task *se_task)
652 {
653         struct se_cmd *se_cmd = se_task->task_se_cmd;
654         struct se_dev_entry *deve;
655         struct se_lun *se_lun;
656         struct se_session *se_sess = se_cmd->se_sess;
657         unsigned char *buf;
658         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
659
660         buf = (unsigned char *) transport_kmap_data_sg(se_cmd);
661
662         /*
663          * If no struct se_session pointer is present, this struct se_cmd is
664          * coming via a target_core_mod PASSTHROUGH op, and not through
665          * a $FABRIC_MOD.  In that case, report LUN=0 only.
666          */
667         if (!se_sess) {
668                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
669                 lun_count = 1;
670                 goto done;
671         }
672
673         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
674         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
675                 deve = &se_sess->se_node_acl->device_list[i];
676                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
677                         continue;
678                 se_lun = deve->se_lun;
679                 /*
680                  * We determine the correct LUN LIST LENGTH even once we
681                  * have reached the initial allocation length.
682                  * See SPC2-R20 7.19.
683                  */
684                 lun_count++;
685                 if ((cdb_offset + 8) >= se_cmd->data_length)
686                         continue;
687
688                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
689                 offset += 8;
690                 cdb_offset += 8;
691         }
692         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
693
694         /*
695          * See SPC3 r07, page 159.
696          */
697 done:
698         transport_kunmap_data_sg(se_cmd);
699         lun_count *= 8;
700         buf[0] = ((lun_count >> 24) & 0xff);
701         buf[1] = ((lun_count >> 16) & 0xff);
702         buf[2] = ((lun_count >> 8) & 0xff);
703         buf[3] = (lun_count & 0xff);
704
705         se_task->task_scsi_status = GOOD;
706         transport_complete_task(se_task, 1);
707         return 0;
708 }
709
710 /*      se_release_device_for_hba():
711  *
712  *
713  */
714 void se_release_device_for_hba(struct se_device *dev)
715 {
716         struct se_hba *hba = dev->se_hba;
717
718         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
719             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
720             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
721             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
722             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
723                 se_dev_stop(dev);
724
725         if (dev->dev_ptr) {
726                 kthread_stop(dev->process_thread);
727                 if (dev->transport->free_device)
728                         dev->transport->free_device(dev->dev_ptr);
729         }
730
731         spin_lock(&hba->device_lock);
732         list_del(&dev->dev_list);
733         hba->dev_count--;
734         spin_unlock(&hba->device_lock);
735
736         core_scsi3_free_all_registrations(dev);
737         se_release_vpd_for_dev(dev);
738
739         kfree(dev);
740 }
741
742 void se_release_vpd_for_dev(struct se_device *dev)
743 {
744         struct t10_vpd *vpd, *vpd_tmp;
745
746         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
747         list_for_each_entry_safe(vpd, vpd_tmp,
748                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
749                 list_del(&vpd->vpd_list);
750                 kfree(vpd);
751         }
752         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
753 }
754
755 /*      se_free_virtual_device():
756  *
757  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
758  */
759 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
760 {
761         if (!list_empty(&dev->dev_sep_list))
762                 dump_stack();
763
764         core_alua_free_lu_gp_mem(dev);
765         se_release_device_for_hba(dev);
766
767         return 0;
768 }
769
770 static void se_dev_start(struct se_device *dev)
771 {
772         struct se_hba *hba = dev->se_hba;
773
774         spin_lock(&hba->device_lock);
775         atomic_inc(&dev->dev_obj.obj_access_count);
776         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
777                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
778                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
779                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
780                 } else if (dev->dev_status &
781                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
782                         dev->dev_status &=
783                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
784                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
785                 }
786         }
787         spin_unlock(&hba->device_lock);
788 }
789
790 static void se_dev_stop(struct se_device *dev)
791 {
792         struct se_hba *hba = dev->se_hba;
793
794         spin_lock(&hba->device_lock);
795         atomic_dec(&dev->dev_obj.obj_access_count);
796         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
797                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
798                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
799                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
800                 } else if (dev->dev_status &
801                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
802                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
803                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
804                 }
805         }
806         spin_unlock(&hba->device_lock);
807 }
808
809 int se_dev_check_online(struct se_device *dev)
810 {
811         unsigned long flags;
812         int ret;
813
814         spin_lock_irqsave(&dev->dev_status_lock, flags);
815         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
816                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
817         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
818
819         return ret;
820 }
821
822 int se_dev_check_shutdown(struct se_device *dev)
823 {
824         int ret;
825
826         spin_lock_irq(&dev->dev_status_lock);
827         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
828         spin_unlock_irq(&dev->dev_status_lock);
829
830         return ret;
831 }
832
833 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
834 {
835         u32 tmp, aligned_max_sectors;
836         /*
837          * Limit max_sectors to a PAGE_SIZE aligned value for modern
838          * transport_allocate_data_tasks() operation.
839          */
840         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
841         aligned_max_sectors = (tmp / block_size);
842         if (max_sectors != aligned_max_sectors) {
843                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
844                                 " to %u\n", max_sectors, aligned_max_sectors);
845                 return aligned_max_sectors;
846         }
847
848         return max_sectors;
849 }
850
851 void se_dev_set_default_attribs(
852         struct se_device *dev,
853         struct se_dev_limits *dev_limits)
854 {
855         struct queue_limits *limits = &dev_limits->limits;
856
857         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
858         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
859         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
860         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
861         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
862         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
863         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
864         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
865         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
866         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
867         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
868         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
869         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
870         /*
871          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
872          * iblock_create_virtdevice() from struct queue_limits values
873          * if blk_queue_discard()==1
874          */
875         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
876         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
877                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
878         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
879         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
880                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
881         /*
882          * block_size is based on subsystem plugin dependent requirements.
883          */
884         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
885         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
886         /*
887          * max_sectors is based on subsystem plugin dependent requirements.
888          */
889         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
890         /*
891          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
892          */
893         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
894                                                 limits->logical_block_size);
895         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
896         /*
897          * Set optimal_sectors from max_sectors, which can be lowered via
898          * configfs.
899          */
900         dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->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_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1233 {
1234         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1235                 pr_err("dev[%p]: Unable to change SE Device"
1236                         " optimal_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 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1241                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1242                                 " changed for TCM/pSCSI\n", dev);
1243                 return -EINVAL;
1244         }
1245         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1246                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1247                         " greater than max_sectors: %u\n", dev,
1248                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1249                 return -EINVAL;
1250         }
1251
1252         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1253         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1254                         dev, optimal_sectors);
1255         return 0;
1256 }
1257
1258 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1259 {
1260         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1261                 pr_err("dev[%p]: Unable to change SE Device block_size"
1262                         " while dev_export_obj: %d count exists\n", dev,
1263                         atomic_read(&dev->dev_export_obj.obj_access_count));
1264                 return -EINVAL;
1265         }
1266
1267         if ((block_size != 512) &&
1268             (block_size != 1024) &&
1269             (block_size != 2048) &&
1270             (block_size != 4096)) {
1271                 pr_err("dev[%p]: Illegal value for block_device: %u"
1272                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1273                         dev, block_size);
1274                 return -EINVAL;
1275         }
1276
1277         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1278                 pr_err("dev[%p]: Not allowed to change block_size for"
1279                         " Physical Device, use for Linux/SCSI to change"
1280                         " block_size for underlying hardware\n", dev);
1281                 return -EINVAL;
1282         }
1283
1284         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1285         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1286                         dev, block_size);
1287         return 0;
1288 }
1289
1290 struct se_lun *core_dev_add_lun(
1291         struct se_portal_group *tpg,
1292         struct se_hba *hba,
1293         struct se_device *dev,
1294         u32 lun)
1295 {
1296         struct se_lun *lun_p;
1297         u32 lun_access = 0;
1298         int rc;
1299
1300         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1301                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1302                         atomic_read(&dev->dev_access_obj.obj_access_count));
1303                 return ERR_PTR(-EACCES);
1304         }
1305
1306         lun_p = core_tpg_pre_addlun(tpg, lun);
1307         if (IS_ERR(lun_p))
1308                 return lun_p;
1309
1310         if (dev->dev_flags & DF_READ_ONLY)
1311                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1312         else
1313                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1314
1315         rc = core_tpg_post_addlun(tpg, lun_p, lun_access, dev);
1316         if (rc < 0)
1317                 return ERR_PTR(rc);
1318
1319         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1320                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1321                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1322                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1323         /*
1324          * Update LUN maps for dynamically added initiators when
1325          * generate_node_acl is enabled.
1326          */
1327         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1328                 struct se_node_acl *acl;
1329                 spin_lock_irq(&tpg->acl_node_lock);
1330                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1331                         if (acl->dynamic_node_acl &&
1332                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1333                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1334                                 spin_unlock_irq(&tpg->acl_node_lock);
1335                                 core_tpg_add_node_to_devs(acl, tpg);
1336                                 spin_lock_irq(&tpg->acl_node_lock);
1337                         }
1338                 }
1339                 spin_unlock_irq(&tpg->acl_node_lock);
1340         }
1341
1342         return lun_p;
1343 }
1344
1345 /*      core_dev_del_lun():
1346  *
1347  *
1348  */
1349 int core_dev_del_lun(
1350         struct se_portal_group *tpg,
1351         u32 unpacked_lun)
1352 {
1353         struct se_lun *lun;
1354
1355         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1356         if (IS_ERR(lun))
1357                 return PTR_ERR(lun);
1358
1359         core_tpg_post_dellun(tpg, lun);
1360
1361         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1362                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1363                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1364                 tpg->se_tpg_tfo->get_fabric_name());
1365
1366         return 0;
1367 }
1368
1369 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1370 {
1371         struct se_lun *lun;
1372
1373         spin_lock(&tpg->tpg_lun_lock);
1374         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1375                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1376                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1377                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1378                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1379                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1380                 spin_unlock(&tpg->tpg_lun_lock);
1381                 return NULL;
1382         }
1383         lun = &tpg->tpg_lun_list[unpacked_lun];
1384
1385         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1386                 pr_err("%s Logical Unit Number: %u is not free on"
1387                         " Target Portal Group: %hu, ignoring request.\n",
1388                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1389                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1390                 spin_unlock(&tpg->tpg_lun_lock);
1391                 return NULL;
1392         }
1393         spin_unlock(&tpg->tpg_lun_lock);
1394
1395         return lun;
1396 }
1397
1398 /*      core_dev_get_lun():
1399  *
1400  *
1401  */
1402 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1403 {
1404         struct se_lun *lun;
1405
1406         spin_lock(&tpg->tpg_lun_lock);
1407         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1408                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1409                         "_TPG-1: %u for Target Portal Group: %hu\n",
1410                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1411                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1412                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1413                 spin_unlock(&tpg->tpg_lun_lock);
1414                 return NULL;
1415         }
1416         lun = &tpg->tpg_lun_list[unpacked_lun];
1417
1418         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1419                 pr_err("%s Logical Unit Number: %u is not active on"
1420                         " Target Portal Group: %hu, ignoring request.\n",
1421                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1422                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1423                 spin_unlock(&tpg->tpg_lun_lock);
1424                 return NULL;
1425         }
1426         spin_unlock(&tpg->tpg_lun_lock);
1427
1428         return lun;
1429 }
1430
1431 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1432         struct se_portal_group *tpg,
1433         u32 mapped_lun,
1434         char *initiatorname,
1435         int *ret)
1436 {
1437         struct se_lun_acl *lacl;
1438         struct se_node_acl *nacl;
1439
1440         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1441                 pr_err("%s InitiatorName exceeds maximum size.\n",
1442                         tpg->se_tpg_tfo->get_fabric_name());
1443                 *ret = -EOVERFLOW;
1444                 return NULL;
1445         }
1446         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1447         if (!nacl) {
1448                 *ret = -EINVAL;
1449                 return NULL;
1450         }
1451         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1452         if (!lacl) {
1453                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1454                 *ret = -ENOMEM;
1455                 return NULL;
1456         }
1457
1458         INIT_LIST_HEAD(&lacl->lacl_list);
1459         lacl->mapped_lun = mapped_lun;
1460         lacl->se_lun_nacl = nacl;
1461         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1462
1463         return lacl;
1464 }
1465
1466 int core_dev_add_initiator_node_lun_acl(
1467         struct se_portal_group *tpg,
1468         struct se_lun_acl *lacl,
1469         u32 unpacked_lun,
1470         u32 lun_access)
1471 {
1472         struct se_lun *lun;
1473         struct se_node_acl *nacl;
1474
1475         lun = core_dev_get_lun(tpg, unpacked_lun);
1476         if (!lun) {
1477                 pr_err("%s Logical Unit Number: %u is not active on"
1478                         " Target Portal Group: %hu, ignoring request.\n",
1479                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1480                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1481                 return -EINVAL;
1482         }
1483
1484         nacl = lacl->se_lun_nacl;
1485         if (!nacl)
1486                 return -EINVAL;
1487
1488         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1489             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1490                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1491
1492         lacl->se_lun = lun;
1493
1494         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1495                         lun_access, nacl, tpg, 1) < 0)
1496                 return -EINVAL;
1497
1498         spin_lock(&lun->lun_acl_lock);
1499         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1500         atomic_inc(&lun->lun_acl_count);
1501         smp_mb__after_atomic_inc();
1502         spin_unlock(&lun->lun_acl_lock);
1503
1504         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1505                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1506                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1507                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1508                 lacl->initiatorname);
1509         /*
1510          * Check to see if there are any existing persistent reservation APTPL
1511          * pre-registrations that need to be enabled for this LUN ACL..
1512          */
1513         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1514         return 0;
1515 }
1516
1517 /*      core_dev_del_initiator_node_lun_acl():
1518  *
1519  *
1520  */
1521 int core_dev_del_initiator_node_lun_acl(
1522         struct se_portal_group *tpg,
1523         struct se_lun *lun,
1524         struct se_lun_acl *lacl)
1525 {
1526         struct se_node_acl *nacl;
1527
1528         nacl = lacl->se_lun_nacl;
1529         if (!nacl)
1530                 return -EINVAL;
1531
1532         spin_lock(&lun->lun_acl_lock);
1533         list_del(&lacl->lacl_list);
1534         atomic_dec(&lun->lun_acl_count);
1535         smp_mb__after_atomic_dec();
1536         spin_unlock(&lun->lun_acl_lock);
1537
1538         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1539                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1540
1541         lacl->se_lun = NULL;
1542
1543         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1544                 " InitiatorNode: %s Mapped LUN: %u\n",
1545                 tpg->se_tpg_tfo->get_fabric_name(),
1546                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1547                 lacl->initiatorname, lacl->mapped_lun);
1548
1549         return 0;
1550 }
1551
1552 void core_dev_free_initiator_node_lun_acl(
1553         struct se_portal_group *tpg,
1554         struct se_lun_acl *lacl)
1555 {
1556         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1557                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1558                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1559                 tpg->se_tpg_tfo->get_fabric_name(),
1560                 lacl->initiatorname, lacl->mapped_lun);
1561
1562         kfree(lacl);
1563 }
1564
1565 int core_dev_setup_virtual_lun0(void)
1566 {
1567         struct se_hba *hba;
1568         struct se_device *dev;
1569         struct se_subsystem_dev *se_dev = NULL;
1570         struct se_subsystem_api *t;
1571         char buf[16];
1572         int ret;
1573
1574         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1575         if (IS_ERR(hba))
1576                 return PTR_ERR(hba);
1577
1578         lun0_hba = hba;
1579         t = hba->transport;
1580
1581         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1582         if (!se_dev) {
1583                 pr_err("Unable to allocate memory for"
1584                                 " struct se_subsystem_dev\n");
1585                 ret = -ENOMEM;
1586                 goto out;
1587         }
1588         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1589         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1590         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1591         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1592         spin_lock_init(&se_dev->t10_pr.registration_lock);
1593         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1594         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1595         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1596         spin_lock_init(&se_dev->se_dev_lock);
1597         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1598         se_dev->t10_wwn.t10_sub_dev = se_dev;
1599         se_dev->t10_alua.t10_sub_dev = se_dev;
1600         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1601         se_dev->se_dev_hba = hba;
1602
1603         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1604         if (!se_dev->se_dev_su_ptr) {
1605                 pr_err("Unable to locate subsystem dependent pointer"
1606                         " from allocate_virtdevice()\n");
1607                 ret = -ENOMEM;
1608                 goto out;
1609         }
1610         lun0_su_dev = se_dev;
1611
1612         memset(buf, 0, 16);
1613         sprintf(buf, "rd_pages=8");
1614         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1615
1616         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1617         if (IS_ERR(dev)) {
1618                 ret = PTR_ERR(dev);
1619                 goto out;
1620         }
1621         se_dev->se_dev_ptr = dev;
1622         g_lun0_dev = dev;
1623
1624         return 0;
1625 out:
1626         lun0_su_dev = NULL;
1627         kfree(se_dev);
1628         if (lun0_hba) {
1629                 core_delete_hba(lun0_hba);
1630                 lun0_hba = NULL;
1631         }
1632         return ret;
1633 }
1634
1635
1636 void core_dev_release_virtual_lun0(void)
1637 {
1638         struct se_hba *hba = lun0_hba;
1639         struct se_subsystem_dev *su_dev = lun0_su_dev;
1640
1641         if (!hba)
1642                 return;
1643
1644         if (g_lun0_dev)
1645                 se_free_virtual_device(g_lun0_dev, hba);
1646
1647         kfree(su_dev);
1648         core_delete_hba(hba);
1649 }