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