target: remove the transport_lun_active field in struct se_cmd
[linux-2.6.git] / drivers / target / target_core_device.c
1 /*******************************************************************************
2  * Filename:  target_core_device.c (based on iscsi_target_device.c)
3  *
4  * This file contains the TCM Virtual Device and Disk Transport
5  * agnostic related functions.
6  *
7  * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
8  * Copyright (c) 2005-2006 SBE, Inc.  All Rights Reserved.
9  * Copyright (c) 2007-2010 Rising Tide Systems
10  * Copyright (c) 2008-2010 Linux-iSCSI.org
11  *
12  * Nicholas A. Bellinger <nab@kernel.org>
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or
17  * (at your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22  * GNU General Public License for more details.
23  *
24  * You should have received a copy of the GNU General Public License
25  * along with this program; if not, write to the Free Software
26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27  *
28  ******************************************************************************/
29
30 #include <linux/net.h>
31 #include <linux/string.h>
32 #include <linux/delay.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
37 #include <linux/in.h>
38 #include <linux/export.h>
39 #include <net/sock.h>
40 #include <net/tcp.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_device.h>
43
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47
48 #include "target_core_internal.h"
49 #include "target_core_alua.h"
50 #include "target_core_pr.h"
51 #include "target_core_ua.h"
52
53 static void se_dev_start(struct se_device *dev);
54 static void se_dev_stop(struct se_device *dev);
55
56 static struct se_hba *lun0_hba;
57 static struct se_subsystem_dev *lun0_su_dev;
58 /* not static, needed by tpg.c */
59 struct se_device *g_lun0_dev;
60
61 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
62 {
63         struct se_lun *se_lun = NULL;
64         struct se_session *se_sess = se_cmd->se_sess;
65         struct se_device *dev;
66         unsigned long flags;
67
68         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
69                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
70                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
71                 return -ENODEV;
72         }
73
74         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
75         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
76         if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
77                 struct se_dev_entry *deve = se_cmd->se_deve;
78
79                 deve->total_cmds++;
80                 deve->total_bytes += se_cmd->data_length;
81
82                 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
83                     (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
84                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
85                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
86                         pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
87                                 " Access for 0x%08x\n",
88                                 se_cmd->se_tfo->get_fabric_name(),
89                                 unpacked_lun);
90                         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
91                         return -EACCES;
92                 }
93
94                 if (se_cmd->data_direction == DMA_TO_DEVICE)
95                         deve->write_bytes += se_cmd->data_length;
96                 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
97                         deve->read_bytes += se_cmd->data_length;
98
99                 deve->deve_cmds++;
100
101                 se_lun = deve->se_lun;
102                 se_cmd->se_lun = deve->se_lun;
103                 se_cmd->pr_res_key = deve->pr_res_key;
104                 se_cmd->orig_fe_lun = unpacked_lun;
105                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
106         }
107         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
108
109         if (!se_lun) {
110                 /*
111                  * Use the se_portal_group->tpg_virt_lun0 to allow for
112                  * REPORT_LUNS, et al to be returned when no active
113                  * MappedLUN=0 exists for this Initiator Port.
114                  */
115                 if (unpacked_lun != 0) {
116                         se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
117                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
118                         pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
119                                 " Access for 0x%08x\n",
120                                 se_cmd->se_tfo->get_fabric_name(),
121                                 unpacked_lun);
122                         return -ENODEV;
123                 }
124                 /*
125                  * Force WRITE PROTECT for virtual LUN 0
126                  */
127                 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
128                     (se_cmd->data_direction != DMA_NONE)) {
129                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
130                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
131                         return -EACCES;
132                 }
133
134                 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
135                 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
136                 se_cmd->orig_fe_lun = 0;
137                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
138         }
139         /*
140          * Determine if the struct se_lun is online.
141          * FIXME: Check for LUN_RESET + UNIT Attention
142          */
143         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
144                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
145                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
146                 return -ENODEV;
147         }
148
149         /* Directly associate cmd with se_dev */
150         se_cmd->se_dev = se_lun->lun_se_dev;
151
152         /* TODO: get rid of this and use atomics for stats */
153         dev = se_lun->lun_se_dev;
154         spin_lock_irqsave(&dev->stats_lock, flags);
155         dev->num_cmds++;
156         if (se_cmd->data_direction == DMA_TO_DEVICE)
157                 dev->write_bytes += se_cmd->data_length;
158         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
159                 dev->read_bytes += se_cmd->data_length;
160         spin_unlock_irqrestore(&dev->stats_lock, flags);
161
162         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
163         list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
164         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
165
166         return 0;
167 }
168 EXPORT_SYMBOL(transport_lookup_cmd_lun);
169
170 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
171 {
172         struct se_dev_entry *deve;
173         struct se_lun *se_lun = NULL;
174         struct se_session *se_sess = se_cmd->se_sess;
175         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
176         unsigned long flags;
177
178         if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
179                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
180                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
181                 return -ENODEV;
182         }
183
184         spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
185         se_cmd->se_deve = &se_sess->se_node_acl->device_list[unpacked_lun];
186         deve = se_cmd->se_deve;
187
188         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
189                 se_tmr->tmr_lun = deve->se_lun;
190                 se_cmd->se_lun = deve->se_lun;
191                 se_lun = deve->se_lun;
192                 se_cmd->pr_res_key = deve->pr_res_key;
193                 se_cmd->orig_fe_lun = unpacked_lun;
194         }
195         spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
196
197         if (!se_lun) {
198                 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
199                         " Access for 0x%08x\n",
200                         se_cmd->se_tfo->get_fabric_name(),
201                         unpacked_lun);
202                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
203                 return -ENODEV;
204         }
205         /*
206          * Determine if the struct se_lun is online.
207          * FIXME: Check for LUN_RESET + UNIT Attention
208          */
209         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
210                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
211                 return -ENODEV;
212         }
213
214         /* Directly associate cmd with se_dev */
215         se_cmd->se_dev = se_lun->lun_se_dev;
216         se_tmr->tmr_dev = se_lun->lun_se_dev;
217
218         spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
219         list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
220         spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
221
222         return 0;
223 }
224 EXPORT_SYMBOL(transport_lookup_tmr_lun);
225
226 /*
227  * This function is called from core_scsi3_emulate_pro_register_and_move()
228  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
229  * when a matching rtpi is found.
230  */
231 struct se_dev_entry *core_get_se_deve_from_rtpi(
232         struct se_node_acl *nacl,
233         u16 rtpi)
234 {
235         struct se_dev_entry *deve;
236         struct se_lun *lun;
237         struct se_port *port;
238         struct se_portal_group *tpg = nacl->se_tpg;
239         u32 i;
240
241         spin_lock_irq(&nacl->device_list_lock);
242         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
243                 deve = &nacl->device_list[i];
244
245                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
246                         continue;
247
248                 lun = deve->se_lun;
249                 if (!lun) {
250                         pr_err("%s device entries device pointer is"
251                                 " NULL, but Initiator has access.\n",
252                                 tpg->se_tpg_tfo->get_fabric_name());
253                         continue;
254                 }
255                 port = lun->lun_sep;
256                 if (!port) {
257                         pr_err("%s device entries device pointer is"
258                                 " NULL, but Initiator has access.\n",
259                                 tpg->se_tpg_tfo->get_fabric_name());
260                         continue;
261                 }
262                 if (port->sep_rtpi != rtpi)
263                         continue;
264
265                 atomic_inc(&deve->pr_ref_count);
266                 smp_mb__after_atomic_inc();
267                 spin_unlock_irq(&nacl->device_list_lock);
268
269                 return deve;
270         }
271         spin_unlock_irq(&nacl->device_list_lock);
272
273         return NULL;
274 }
275
276 int core_free_device_list_for_node(
277         struct se_node_acl *nacl,
278         struct se_portal_group *tpg)
279 {
280         struct se_dev_entry *deve;
281         struct se_lun *lun;
282         u32 i;
283
284         if (!nacl->device_list)
285                 return 0;
286
287         spin_lock_irq(&nacl->device_list_lock);
288         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
289                 deve = &nacl->device_list[i];
290
291                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
292                         continue;
293
294                 if (!deve->se_lun) {
295                         pr_err("%s device entries device pointer is"
296                                 " NULL, but Initiator has access.\n",
297                                 tpg->se_tpg_tfo->get_fabric_name());
298                         continue;
299                 }
300                 lun = deve->se_lun;
301
302                 spin_unlock_irq(&nacl->device_list_lock);
303                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
304                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
305                 spin_lock_irq(&nacl->device_list_lock);
306         }
307         spin_unlock_irq(&nacl->device_list_lock);
308
309         kfree(nacl->device_list);
310         nacl->device_list = NULL;
311
312         return 0;
313 }
314
315 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
316 {
317         struct se_dev_entry *deve;
318         unsigned long flags;
319
320         spin_lock_irqsave(&se_nacl->device_list_lock, flags);
321         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
322         deve->deve_cmds--;
323         spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
324 }
325
326 void core_update_device_list_access(
327         u32 mapped_lun,
328         u32 lun_access,
329         struct se_node_acl *nacl)
330 {
331         struct se_dev_entry *deve;
332
333         spin_lock_irq(&nacl->device_list_lock);
334         deve = &nacl->device_list[mapped_lun];
335         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
336                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
337                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
338         } else {
339                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
340                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
341         }
342         spin_unlock_irq(&nacl->device_list_lock);
343 }
344
345 /*      core_update_device_list_for_node():
346  *
347  *
348  */
349 int core_update_device_list_for_node(
350         struct se_lun *lun,
351         struct se_lun_acl *lun_acl,
352         u32 mapped_lun,
353         u32 lun_access,
354         struct se_node_acl *nacl,
355         struct se_portal_group *tpg,
356         int enable)
357 {
358         struct se_port *port = lun->lun_sep;
359         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
360         int trans = 0;
361         /*
362          * If the MappedLUN entry is being disabled, the entry in
363          * port->sep_alua_list must be removed now before clearing the
364          * struct se_dev_entry pointers below as logic in
365          * core_alua_do_transition_tg_pt() depends on these being present.
366          */
367         if (!enable) {
368                 /*
369                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
370                  * that have not been explicitly concerted to MappedLUNs ->
371                  * struct se_lun_acl, but we remove deve->alua_port_list from
372                  * port->sep_alua_list. This also means that active UAs and
373                  * NodeACL context specific PR metadata for demo-mode
374                  * MappedLUN *deve will be released below..
375                  */
376                 spin_lock_bh(&port->sep_alua_lock);
377                 list_del(&deve->alua_port_list);
378                 spin_unlock_bh(&port->sep_alua_lock);
379         }
380
381         spin_lock_irq(&nacl->device_list_lock);
382         if (enable) {
383                 /*
384                  * Check if the call is handling demo mode -> explict LUN ACL
385                  * transition.  This transition must be for the same struct se_lun
386                  * + mapped_lun that was setup in demo mode..
387                  */
388                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
389                         if (deve->se_lun_acl != NULL) {
390                                 pr_err("struct se_dev_entry->se_lun_acl"
391                                         " already set for demo mode -> explict"
392                                         " LUN ACL transition\n");
393                                 spin_unlock_irq(&nacl->device_list_lock);
394                                 return -EINVAL;
395                         }
396                         if (deve->se_lun != lun) {
397                                 pr_err("struct se_dev_entry->se_lun does"
398                                         " match passed struct se_lun for demo mode"
399                                         " -> explict LUN ACL transition\n");
400                                 spin_unlock_irq(&nacl->device_list_lock);
401                                 return -EINVAL;
402                         }
403                         deve->se_lun_acl = lun_acl;
404                         trans = 1;
405                 } else {
406                         deve->se_lun = lun;
407                         deve->se_lun_acl = lun_acl;
408                         deve->mapped_lun = mapped_lun;
409                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
410                 }
411
412                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
413                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
414                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
415                 } else {
416                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
417                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
418                 }
419
420                 if (trans) {
421                         spin_unlock_irq(&nacl->device_list_lock);
422                         return 0;
423                 }
424                 deve->creation_time = get_jiffies_64();
425                 deve->attach_count++;
426                 spin_unlock_irq(&nacl->device_list_lock);
427
428                 spin_lock_bh(&port->sep_alua_lock);
429                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
430                 spin_unlock_bh(&port->sep_alua_lock);
431
432                 return 0;
433         }
434         /*
435          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
436          * PR operation to complete.
437          */
438         spin_unlock_irq(&nacl->device_list_lock);
439         while (atomic_read(&deve->pr_ref_count) != 0)
440                 cpu_relax();
441         spin_lock_irq(&nacl->device_list_lock);
442         /*
443          * Disable struct se_dev_entry LUN ACL mapping
444          */
445         core_scsi3_ua_release_all(deve);
446         deve->se_lun = NULL;
447         deve->se_lun_acl = NULL;
448         deve->lun_flags = 0;
449         deve->creation_time = 0;
450         deve->attach_count--;
451         spin_unlock_irq(&nacl->device_list_lock);
452
453         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
454         return 0;
455 }
456
457 /*      core_clear_lun_from_tpg():
458  *
459  *
460  */
461 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
462 {
463         struct se_node_acl *nacl;
464         struct se_dev_entry *deve;
465         u32 i;
466
467         spin_lock_irq(&tpg->acl_node_lock);
468         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
469                 spin_unlock_irq(&tpg->acl_node_lock);
470
471                 spin_lock_irq(&nacl->device_list_lock);
472                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
473                         deve = &nacl->device_list[i];
474                         if (lun != deve->se_lun)
475                                 continue;
476                         spin_unlock_irq(&nacl->device_list_lock);
477
478                         core_update_device_list_for_node(lun, NULL,
479                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
480                                 nacl, tpg, 0);
481
482                         spin_lock_irq(&nacl->device_list_lock);
483                 }
484                 spin_unlock_irq(&nacl->device_list_lock);
485
486                 spin_lock_irq(&tpg->acl_node_lock);
487         }
488         spin_unlock_irq(&tpg->acl_node_lock);
489 }
490
491 static struct se_port *core_alloc_port(struct se_device *dev)
492 {
493         struct se_port *port, *port_tmp;
494
495         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
496         if (!port) {
497                 pr_err("Unable to allocate struct se_port\n");
498                 return ERR_PTR(-ENOMEM);
499         }
500         INIT_LIST_HEAD(&port->sep_alua_list);
501         INIT_LIST_HEAD(&port->sep_list);
502         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
503         spin_lock_init(&port->sep_alua_lock);
504         mutex_init(&port->sep_tg_pt_md_mutex);
505
506         spin_lock(&dev->se_port_lock);
507         if (dev->dev_port_count == 0x0000ffff) {
508                 pr_warn("Reached dev->dev_port_count =="
509                                 " 0x0000ffff\n");
510                 spin_unlock(&dev->se_port_lock);
511                 return ERR_PTR(-ENOSPC);
512         }
513 again:
514         /*
515          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
516          * Here is the table from spc4r17 section 7.7.3.8.
517          *
518          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
519          *
520          * Code      Description
521          * 0h        Reserved
522          * 1h        Relative port 1, historically known as port A
523          * 2h        Relative port 2, historically known as port B
524          * 3h to FFFFh    Relative port 3 through 65 535
525          */
526         port->sep_rtpi = dev->dev_rpti_counter++;
527         if (!port->sep_rtpi)
528                 goto again;
529
530         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
531                 /*
532                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
533                  * for 16-bit wrap..
534                  */
535                 if (port->sep_rtpi == port_tmp->sep_rtpi)
536                         goto again;
537         }
538         spin_unlock(&dev->se_port_lock);
539
540         return port;
541 }
542
543 static void core_export_port(
544         struct se_device *dev,
545         struct se_portal_group *tpg,
546         struct se_port *port,
547         struct se_lun *lun)
548 {
549         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
550         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
551
552         spin_lock(&dev->se_port_lock);
553         spin_lock(&lun->lun_sep_lock);
554         port->sep_tpg = tpg;
555         port->sep_lun = lun;
556         lun->lun_sep = port;
557         spin_unlock(&lun->lun_sep_lock);
558
559         list_add_tail(&port->sep_list, &dev->dev_sep_list);
560         spin_unlock(&dev->se_port_lock);
561
562         if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
563                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
564                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
565                         pr_err("Unable to allocate t10_alua_tg_pt"
566                                         "_gp_member_t\n");
567                         return;
568                 }
569                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
570                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
571                         su_dev->t10_alua.default_tg_pt_gp);
572                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
573                 pr_debug("%s/%s: Adding to default ALUA Target Port"
574                         " Group: alua/default_tg_pt_gp\n",
575                         dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
576         }
577
578         dev->dev_port_count++;
579         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
580 }
581
582 /*
583  *      Called with struct se_device->se_port_lock spinlock held.
584  */
585 static void core_release_port(struct se_device *dev, struct se_port *port)
586         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
587 {
588         /*
589          * Wait for any port reference for PR ALL_TG_PT=1 operation
590          * to complete in __core_scsi3_alloc_registration()
591          */
592         spin_unlock(&dev->se_port_lock);
593         if (atomic_read(&port->sep_tg_pt_ref_cnt))
594                 cpu_relax();
595         spin_lock(&dev->se_port_lock);
596
597         core_alua_free_tg_pt_gp_mem(port);
598
599         list_del(&port->sep_list);
600         dev->dev_port_count--;
601         kfree(port);
602 }
603
604 int core_dev_export(
605         struct se_device *dev,
606         struct se_portal_group *tpg,
607         struct se_lun *lun)
608 {
609         struct se_port *port;
610
611         port = core_alloc_port(dev);
612         if (IS_ERR(port))
613                 return PTR_ERR(port);
614
615         lun->lun_se_dev = dev;
616         se_dev_start(dev);
617
618         atomic_inc(&dev->dev_export_obj.obj_access_count);
619         core_export_port(dev, tpg, port, lun);
620         return 0;
621 }
622
623 void core_dev_unexport(
624         struct se_device *dev,
625         struct se_portal_group *tpg,
626         struct se_lun *lun)
627 {
628         struct se_port *port = lun->lun_sep;
629
630         spin_lock(&lun->lun_sep_lock);
631         if (lun->lun_se_dev == NULL) {
632                 spin_unlock(&lun->lun_sep_lock);
633                 return;
634         }
635         spin_unlock(&lun->lun_sep_lock);
636
637         spin_lock(&dev->se_port_lock);
638         atomic_dec(&dev->dev_export_obj.obj_access_count);
639         core_release_port(dev, port);
640         spin_unlock(&dev->se_port_lock);
641
642         se_dev_stop(dev);
643         lun->lun_se_dev = NULL;
644 }
645
646 int target_report_luns(struct se_task *se_task)
647 {
648         struct se_cmd *se_cmd = se_task->task_se_cmd;
649         struct se_dev_entry *deve;
650         struct se_lun *se_lun;
651         struct se_session *se_sess = se_cmd->se_sess;
652         unsigned char *buf;
653         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
654
655         buf = (unsigned char *) transport_kmap_data_sg(se_cmd);
656
657         /*
658          * If no struct se_session pointer is present, this struct se_cmd is
659          * coming via a target_core_mod PASSTHROUGH op, and not through
660          * a $FABRIC_MOD.  In that case, report LUN=0 only.
661          */
662         if (!se_sess) {
663                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
664                 lun_count = 1;
665                 goto done;
666         }
667
668         spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
669         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
670                 deve = &se_sess->se_node_acl->device_list[i];
671                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
672                         continue;
673                 se_lun = deve->se_lun;
674                 /*
675                  * We determine the correct LUN LIST LENGTH even once we
676                  * have reached the initial allocation length.
677                  * See SPC2-R20 7.19.
678                  */
679                 lun_count++;
680                 if ((cdb_offset + 8) >= se_cmd->data_length)
681                         continue;
682
683                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
684                 offset += 8;
685                 cdb_offset += 8;
686         }
687         spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
688
689         /*
690          * See SPC3 r07, page 159.
691          */
692 done:
693         transport_kunmap_data_sg(se_cmd);
694         lun_count *= 8;
695         buf[0] = ((lun_count >> 24) & 0xff);
696         buf[1] = ((lun_count >> 16) & 0xff);
697         buf[2] = ((lun_count >> 8) & 0xff);
698         buf[3] = (lun_count & 0xff);
699
700         se_task->task_scsi_status = GOOD;
701         transport_complete_task(se_task, 1);
702         return 0;
703 }
704
705 /*      se_release_device_for_hba():
706  *
707  *
708  */
709 void se_release_device_for_hba(struct se_device *dev)
710 {
711         struct se_hba *hba = dev->se_hba;
712
713         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
714             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
715             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
716             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
717             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
718                 se_dev_stop(dev);
719
720         if (dev->dev_ptr) {
721                 kthread_stop(dev->process_thread);
722                 if (dev->transport->free_device)
723                         dev->transport->free_device(dev->dev_ptr);
724         }
725
726         spin_lock(&hba->device_lock);
727         list_del(&dev->dev_list);
728         hba->dev_count--;
729         spin_unlock(&hba->device_lock);
730
731         core_scsi3_free_all_registrations(dev);
732         se_release_vpd_for_dev(dev);
733
734         kfree(dev);
735 }
736
737 void se_release_vpd_for_dev(struct se_device *dev)
738 {
739         struct t10_vpd *vpd, *vpd_tmp;
740
741         spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
742         list_for_each_entry_safe(vpd, vpd_tmp,
743                         &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
744                 list_del(&vpd->vpd_list);
745                 kfree(vpd);
746         }
747         spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
748 }
749
750 /*      se_free_virtual_device():
751  *
752  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
753  */
754 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
755 {
756         if (!list_empty(&dev->dev_sep_list))
757                 dump_stack();
758
759         core_alua_free_lu_gp_mem(dev);
760         se_release_device_for_hba(dev);
761
762         return 0;
763 }
764
765 static void se_dev_start(struct se_device *dev)
766 {
767         struct se_hba *hba = dev->se_hba;
768
769         spin_lock(&hba->device_lock);
770         atomic_inc(&dev->dev_obj.obj_access_count);
771         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
772                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
773                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
774                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
775                 } else if (dev->dev_status &
776                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
777                         dev->dev_status &=
778                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
779                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
780                 }
781         }
782         spin_unlock(&hba->device_lock);
783 }
784
785 static void se_dev_stop(struct se_device *dev)
786 {
787         struct se_hba *hba = dev->se_hba;
788
789         spin_lock(&hba->device_lock);
790         atomic_dec(&dev->dev_obj.obj_access_count);
791         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
792                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
793                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
794                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
795                 } else if (dev->dev_status &
796                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
797                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
798                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
799                 }
800         }
801         spin_unlock(&hba->device_lock);
802 }
803
804 int se_dev_check_online(struct se_device *dev)
805 {
806         unsigned long flags;
807         int ret;
808
809         spin_lock_irqsave(&dev->dev_status_lock, flags);
810         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
811                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
812         spin_unlock_irqrestore(&dev->dev_status_lock, flags);
813
814         return ret;
815 }
816
817 int se_dev_check_shutdown(struct se_device *dev)
818 {
819         int ret;
820
821         spin_lock_irq(&dev->dev_status_lock);
822         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
823         spin_unlock_irq(&dev->dev_status_lock);
824
825         return ret;
826 }
827
828 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
829 {
830         u32 tmp, aligned_max_sectors;
831         /*
832          * Limit max_sectors to a PAGE_SIZE aligned value for modern
833          * transport_allocate_data_tasks() operation.
834          */
835         tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
836         aligned_max_sectors = (tmp / block_size);
837         if (max_sectors != aligned_max_sectors) {
838                 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
839                                 " to %u\n", max_sectors, aligned_max_sectors);
840                 return aligned_max_sectors;
841         }
842
843         return max_sectors;
844 }
845
846 void se_dev_set_default_attribs(
847         struct se_device *dev,
848         struct se_dev_limits *dev_limits)
849 {
850         struct queue_limits *limits = &dev_limits->limits;
851
852         dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
853         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
854         dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
855         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
856         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
857         dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
858         dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
859         dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
860         dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
861         dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
862         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
863         dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
864         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
865         /*
866          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
867          * iblock_create_virtdevice() from struct queue_limits values
868          * if blk_queue_discard()==1
869          */
870         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
871         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
872                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
873         dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
874         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
875                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
876         /*
877          * block_size is based on subsystem plugin dependent requirements.
878          */
879         dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
880         dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
881         /*
882          * max_sectors is based on subsystem plugin dependent requirements.
883          */
884         dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
885         /*
886          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
887          */
888         limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
889                                                 limits->logical_block_size);
890         dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
891         /*
892          * Set optimal_sectors from max_sectors, which can be lowered via
893          * configfs.
894          */
895         dev->se_sub_dev->se_dev_attrib.optimal_sectors = limits->max_sectors;
896         /*
897          * queue_depth is based on subsystem plugin dependent requirements.
898          */
899         dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
900         dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
901 }
902
903 int se_dev_set_max_unmap_lba_count(
904         struct se_device *dev,
905         u32 max_unmap_lba_count)
906 {
907         dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
908         pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
909                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
910         return 0;
911 }
912
913 int se_dev_set_max_unmap_block_desc_count(
914         struct se_device *dev,
915         u32 max_unmap_block_desc_count)
916 {
917         dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
918                 max_unmap_block_desc_count;
919         pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
920                         dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
921         return 0;
922 }
923
924 int se_dev_set_unmap_granularity(
925         struct se_device *dev,
926         u32 unmap_granularity)
927 {
928         dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
929         pr_debug("dev[%p]: Set unmap_granularity: %u\n",
930                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
931         return 0;
932 }
933
934 int se_dev_set_unmap_granularity_alignment(
935         struct se_device *dev,
936         u32 unmap_granularity_alignment)
937 {
938         dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
939         pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
940                         dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
941         return 0;
942 }
943
944 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
945 {
946         if (flag != 0 && flag != 1) {
947                 pr_err("Illegal value %d\n", flag);
948                 return -EINVAL;
949         }
950
951         if (flag) {
952                 pr_err("dpo_emulated not supported\n");
953                 return -EINVAL;
954         }
955
956         return 0;
957 }
958
959 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
960 {
961         if (flag != 0 && flag != 1) {
962                 pr_err("Illegal value %d\n", flag);
963                 return -EINVAL;
964         }
965
966         if (flag && dev->transport->fua_write_emulated == 0) {
967                 pr_err("fua_write_emulated not supported\n");
968                 return -EINVAL;
969         }
970         dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
971         pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
972                         dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
973         return 0;
974 }
975
976 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
977 {
978         if (flag != 0 && flag != 1) {
979                 pr_err("Illegal value %d\n", flag);
980                 return -EINVAL;
981         }
982
983         if (flag) {
984                 pr_err("ua read emulated not supported\n");
985                 return -EINVAL;
986         }
987
988         return 0;
989 }
990
991 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
992 {
993         if (flag != 0 && flag != 1) {
994                 pr_err("Illegal value %d\n", flag);
995                 return -EINVAL;
996         }
997         if (flag && dev->transport->write_cache_emulated == 0) {
998                 pr_err("write_cache_emulated not supported\n");
999                 return -EINVAL;
1000         }
1001         dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1002         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1003                         dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1004         return 0;
1005 }
1006
1007 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1008 {
1009         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1010                 pr_err("Illegal value %d\n", flag);
1011                 return -EINVAL;
1012         }
1013
1014         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1015                 pr_err("dev[%p]: Unable to change SE Device"
1016                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1017                         " exists\n", dev,
1018                         atomic_read(&dev->dev_export_obj.obj_access_count));
1019                 return -EINVAL;
1020         }
1021         dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1022         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1023                 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1024
1025         return 0;
1026 }
1027
1028 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1029 {
1030         if ((flag != 0) && (flag != 1)) {
1031                 pr_err("Illegal value %d\n", flag);
1032                 return -EINVAL;
1033         }
1034
1035         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1036                 pr_err("dev[%p]: Unable to change SE Device TAS while"
1037                         " dev_export_obj: %d count exists\n", dev,
1038                         atomic_read(&dev->dev_export_obj.obj_access_count));
1039                 return -EINVAL;
1040         }
1041         dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1042         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1043                 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1044
1045         return 0;
1046 }
1047
1048 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1049 {
1050         if ((flag != 0) && (flag != 1)) {
1051                 pr_err("Illegal value %d\n", flag);
1052                 return -EINVAL;
1053         }
1054         /*
1055          * We expect this value to be non-zero when generic Block Layer
1056          * Discard supported is detected iblock_create_virtdevice().
1057          */
1058         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1059                 pr_err("Generic Block Discard not supported\n");
1060                 return -ENOSYS;
1061         }
1062
1063         dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1064         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1065                                 dev, flag);
1066         return 0;
1067 }
1068
1069 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1070 {
1071         if ((flag != 0) && (flag != 1)) {
1072                 pr_err("Illegal value %d\n", flag);
1073                 return -EINVAL;
1074         }
1075         /*
1076          * We expect this value to be non-zero when generic Block Layer
1077          * Discard supported is detected iblock_create_virtdevice().
1078          */
1079         if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1080                 pr_err("Generic Block Discard not supported\n");
1081                 return -ENOSYS;
1082         }
1083
1084         dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1085         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1086                                 dev, flag);
1087         return 0;
1088 }
1089
1090 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1091 {
1092         if ((flag != 0) && (flag != 1)) {
1093                 pr_err("Illegal value %d\n", flag);
1094                 return -EINVAL;
1095         }
1096         dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1097         pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1098                 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1099         return 0;
1100 }
1101
1102 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1103 {
1104         if ((flag != 0) && (flag != 1)) {
1105                 printk(KERN_ERR "Illegal value %d\n", flag);
1106                 return -EINVAL;
1107         }
1108         dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1109         pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1110                dev, flag);
1111         return 0;
1112 }
1113
1114 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1115 {
1116         if (flag != 0) {
1117                 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1118                         " reordering not implemented\n", dev);
1119                 return -ENOSYS;
1120         }
1121         dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1122         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1123         return 0;
1124 }
1125
1126 /*
1127  * Note, this can only be called on unexported SE Device Object.
1128  */
1129 int se_dev_set_queue_depth(struct se_device *dev, u32 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         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1165                         dev, queue_depth);
1166         return 0;
1167 }
1168
1169 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1170 {
1171         int force = 0; /* Force setting for VDEVS */
1172
1173         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1174                 pr_err("dev[%p]: Unable to change SE Device"
1175                         " max_sectors while dev_export_obj: %d count exists\n",
1176                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1177                 return -EINVAL;
1178         }
1179         if (!max_sectors) {
1180                 pr_err("dev[%p]: Illegal ZERO value for"
1181                         " max_sectors\n", dev);
1182                 return -EINVAL;
1183         }
1184         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1185                 pr_err("dev[%p]: Passed max_sectors: %u less than"
1186                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1187                                 DA_STATUS_MAX_SECTORS_MIN);
1188                 return -EINVAL;
1189         }
1190         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1191                 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1192                         pr_err("dev[%p]: Passed max_sectors: %u"
1193                                 " greater than TCM/SE_Device max_sectors:"
1194                                 " %u\n", dev, max_sectors,
1195                                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1196                          return -EINVAL;
1197                 }
1198         } else {
1199                 if (!force && (max_sectors >
1200                                  dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1201                         pr_err("dev[%p]: Passed max_sectors: %u"
1202                                 " greater than TCM/SE_Device max_sectors"
1203                                 ": %u, use force=1 to override.\n", dev,
1204                                 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1205                         return -EINVAL;
1206                 }
1207                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1208                         pr_err("dev[%p]: Passed max_sectors: %u"
1209                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1210                                 " %u\n", dev, max_sectors,
1211                                 DA_STATUS_MAX_SECTORS_MAX);
1212                         return -EINVAL;
1213                 }
1214         }
1215         /*
1216          * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1217          */
1218         max_sectors = se_dev_align_max_sectors(max_sectors,
1219                                 dev->se_sub_dev->se_dev_attrib.block_size);
1220
1221         dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1222         pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1223                         dev, max_sectors);
1224         return 0;
1225 }
1226
1227 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1228 {
1229         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1230                 pr_err("dev[%p]: Unable to change SE Device"
1231                         " optimal_sectors while dev_export_obj: %d count exists\n",
1232                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1233                 return -EINVAL;
1234         }
1235         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1236                 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1237                                 " changed for TCM/pSCSI\n", dev);
1238                 return -EINVAL;
1239         }
1240         if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.max_sectors) {
1241                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1242                         " greater than max_sectors: %u\n", dev,
1243                         optimal_sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
1244                 return -EINVAL;
1245         }
1246
1247         dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1248         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1249                         dev, optimal_sectors);
1250         return 0;
1251 }
1252
1253 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1254 {
1255         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1256                 pr_err("dev[%p]: Unable to change SE Device block_size"
1257                         " while dev_export_obj: %d count exists\n", dev,
1258                         atomic_read(&dev->dev_export_obj.obj_access_count));
1259                 return -EINVAL;
1260         }
1261
1262         if ((block_size != 512) &&
1263             (block_size != 1024) &&
1264             (block_size != 2048) &&
1265             (block_size != 4096)) {
1266                 pr_err("dev[%p]: Illegal value for block_device: %u"
1267                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1268                         dev, block_size);
1269                 return -EINVAL;
1270         }
1271
1272         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1273                 pr_err("dev[%p]: Not allowed to change block_size for"
1274                         " Physical Device, use for Linux/SCSI to change"
1275                         " block_size for underlying hardware\n", dev);
1276                 return -EINVAL;
1277         }
1278
1279         dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1280         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1281                         dev, block_size);
1282         return 0;
1283 }
1284
1285 struct se_lun *core_dev_add_lun(
1286         struct se_portal_group *tpg,
1287         struct se_hba *hba,
1288         struct se_device *dev,
1289         u32 lun)
1290 {
1291         struct se_lun *lun_p;
1292         u32 lun_access = 0;
1293         int rc;
1294
1295         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1296                 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1297                         atomic_read(&dev->dev_access_obj.obj_access_count));
1298                 return ERR_PTR(-EACCES);
1299         }
1300
1301         lun_p = core_tpg_pre_addlun(tpg, lun);
1302         if (IS_ERR(lun_p))
1303                 return lun_p;
1304
1305         if (dev->dev_flags & DF_READ_ONLY)
1306                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1307         else
1308                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1309
1310         rc = core_tpg_post_addlun(tpg, lun_p, lun_access, dev);
1311         if (rc < 0)
1312                 return ERR_PTR(rc);
1313
1314         pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1315                 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1316                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1317                 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1318         /*
1319          * Update LUN maps for dynamically added initiators when
1320          * generate_node_acl is enabled.
1321          */
1322         if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1323                 struct se_node_acl *acl;
1324                 spin_lock_irq(&tpg->acl_node_lock);
1325                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1326                         if (acl->dynamic_node_acl &&
1327                             (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1328                              !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1329                                 spin_unlock_irq(&tpg->acl_node_lock);
1330                                 core_tpg_add_node_to_devs(acl, tpg);
1331                                 spin_lock_irq(&tpg->acl_node_lock);
1332                         }
1333                 }
1334                 spin_unlock_irq(&tpg->acl_node_lock);
1335         }
1336
1337         return lun_p;
1338 }
1339
1340 /*      core_dev_del_lun():
1341  *
1342  *
1343  */
1344 int core_dev_del_lun(
1345         struct se_portal_group *tpg,
1346         u32 unpacked_lun)
1347 {
1348         struct se_lun *lun;
1349
1350         lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1351         if (IS_ERR(lun))
1352                 return PTR_ERR(lun);
1353
1354         core_tpg_post_dellun(tpg, lun);
1355
1356         pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1357                 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1358                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1359                 tpg->se_tpg_tfo->get_fabric_name());
1360
1361         return 0;
1362 }
1363
1364 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1365 {
1366         struct se_lun *lun;
1367
1368         spin_lock(&tpg->tpg_lun_lock);
1369         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1370                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1371                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1372                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1373                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1374                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1375                 spin_unlock(&tpg->tpg_lun_lock);
1376                 return NULL;
1377         }
1378         lun = &tpg->tpg_lun_list[unpacked_lun];
1379
1380         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1381                 pr_err("%s Logical Unit Number: %u is not free on"
1382                         " Target Portal Group: %hu, ignoring request.\n",
1383                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1384                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1385                 spin_unlock(&tpg->tpg_lun_lock);
1386                 return NULL;
1387         }
1388         spin_unlock(&tpg->tpg_lun_lock);
1389
1390         return lun;
1391 }
1392
1393 /*      core_dev_get_lun():
1394  *
1395  *
1396  */
1397 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1398 {
1399         struct se_lun *lun;
1400
1401         spin_lock(&tpg->tpg_lun_lock);
1402         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1403                 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1404                         "_TPG-1: %u for Target Portal Group: %hu\n",
1405                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1406                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1407                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1408                 spin_unlock(&tpg->tpg_lun_lock);
1409                 return NULL;
1410         }
1411         lun = &tpg->tpg_lun_list[unpacked_lun];
1412
1413         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1414                 pr_err("%s Logical Unit Number: %u is not active on"
1415                         " Target Portal Group: %hu, ignoring request.\n",
1416                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1417                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1418                 spin_unlock(&tpg->tpg_lun_lock);
1419                 return NULL;
1420         }
1421         spin_unlock(&tpg->tpg_lun_lock);
1422
1423         return lun;
1424 }
1425
1426 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1427         struct se_portal_group *tpg,
1428         u32 mapped_lun,
1429         char *initiatorname,
1430         int *ret)
1431 {
1432         struct se_lun_acl *lacl;
1433         struct se_node_acl *nacl;
1434
1435         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1436                 pr_err("%s InitiatorName exceeds maximum size.\n",
1437                         tpg->se_tpg_tfo->get_fabric_name());
1438                 *ret = -EOVERFLOW;
1439                 return NULL;
1440         }
1441         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1442         if (!nacl) {
1443                 *ret = -EINVAL;
1444                 return NULL;
1445         }
1446         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1447         if (!lacl) {
1448                 pr_err("Unable to allocate memory for struct se_lun_acl.\n");
1449                 *ret = -ENOMEM;
1450                 return NULL;
1451         }
1452
1453         INIT_LIST_HEAD(&lacl->lacl_list);
1454         lacl->mapped_lun = mapped_lun;
1455         lacl->se_lun_nacl = nacl;
1456         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1457
1458         return lacl;
1459 }
1460
1461 int core_dev_add_initiator_node_lun_acl(
1462         struct se_portal_group *tpg,
1463         struct se_lun_acl *lacl,
1464         u32 unpacked_lun,
1465         u32 lun_access)
1466 {
1467         struct se_lun *lun;
1468         struct se_node_acl *nacl;
1469
1470         lun = core_dev_get_lun(tpg, unpacked_lun);
1471         if (!lun) {
1472                 pr_err("%s Logical Unit Number: %u is not active on"
1473                         " Target Portal Group: %hu, ignoring request.\n",
1474                         tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1475                         tpg->se_tpg_tfo->tpg_get_tag(tpg));
1476                 return -EINVAL;
1477         }
1478
1479         nacl = lacl->se_lun_nacl;
1480         if (!nacl)
1481                 return -EINVAL;
1482
1483         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1484             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1485                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1486
1487         lacl->se_lun = lun;
1488
1489         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1490                         lun_access, nacl, tpg, 1) < 0)
1491                 return -EINVAL;
1492
1493         spin_lock(&lun->lun_acl_lock);
1494         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1495         atomic_inc(&lun->lun_acl_count);
1496         smp_mb__after_atomic_inc();
1497         spin_unlock(&lun->lun_acl_lock);
1498
1499         pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1500                 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1501                 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1502                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1503                 lacl->initiatorname);
1504         /*
1505          * Check to see if there are any existing persistent reservation APTPL
1506          * pre-registrations that need to be enabled for this LUN ACL..
1507          */
1508         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1509         return 0;
1510 }
1511
1512 /*      core_dev_del_initiator_node_lun_acl():
1513  *
1514  *
1515  */
1516 int core_dev_del_initiator_node_lun_acl(
1517         struct se_portal_group *tpg,
1518         struct se_lun *lun,
1519         struct se_lun_acl *lacl)
1520 {
1521         struct se_node_acl *nacl;
1522
1523         nacl = lacl->se_lun_nacl;
1524         if (!nacl)
1525                 return -EINVAL;
1526
1527         spin_lock(&lun->lun_acl_lock);
1528         list_del(&lacl->lacl_list);
1529         atomic_dec(&lun->lun_acl_count);
1530         smp_mb__after_atomic_dec();
1531         spin_unlock(&lun->lun_acl_lock);
1532
1533         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1534                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1535
1536         lacl->se_lun = NULL;
1537
1538         pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1539                 " InitiatorNode: %s Mapped LUN: %u\n",
1540                 tpg->se_tpg_tfo->get_fabric_name(),
1541                 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
1542                 lacl->initiatorname, lacl->mapped_lun);
1543
1544         return 0;
1545 }
1546
1547 void core_dev_free_initiator_node_lun_acl(
1548         struct se_portal_group *tpg,
1549         struct se_lun_acl *lacl)
1550 {
1551         pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1552                 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1553                 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1554                 tpg->se_tpg_tfo->get_fabric_name(),
1555                 lacl->initiatorname, lacl->mapped_lun);
1556
1557         kfree(lacl);
1558 }
1559
1560 int core_dev_setup_virtual_lun0(void)
1561 {
1562         struct se_hba *hba;
1563         struct se_device *dev;
1564         struct se_subsystem_dev *se_dev = NULL;
1565         struct se_subsystem_api *t;
1566         char buf[16];
1567         int ret;
1568
1569         hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1570         if (IS_ERR(hba))
1571                 return PTR_ERR(hba);
1572
1573         lun0_hba = hba;
1574         t = hba->transport;
1575
1576         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1577         if (!se_dev) {
1578                 pr_err("Unable to allocate memory for"
1579                                 " struct se_subsystem_dev\n");
1580                 ret = -ENOMEM;
1581                 goto out;
1582         }
1583         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1584         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1585         INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1586         INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1587         spin_lock_init(&se_dev->t10_pr.registration_lock);
1588         spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1589         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1590         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1591         spin_lock_init(&se_dev->se_dev_lock);
1592         se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1593         se_dev->t10_wwn.t10_sub_dev = se_dev;
1594         se_dev->t10_alua.t10_sub_dev = se_dev;
1595         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1596         se_dev->se_dev_hba = hba;
1597
1598         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1599         if (!se_dev->se_dev_su_ptr) {
1600                 pr_err("Unable to locate subsystem dependent pointer"
1601                         " from allocate_virtdevice()\n");
1602                 ret = -ENOMEM;
1603                 goto out;
1604         }
1605         lun0_su_dev = se_dev;
1606
1607         memset(buf, 0, 16);
1608         sprintf(buf, "rd_pages=8");
1609         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1610
1611         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1612         if (IS_ERR(dev)) {
1613                 ret = PTR_ERR(dev);
1614                 goto out;
1615         }
1616         se_dev->se_dev_ptr = dev;
1617         g_lun0_dev = dev;
1618
1619         return 0;
1620 out:
1621         lun0_su_dev = NULL;
1622         kfree(se_dev);
1623         if (lun0_hba) {
1624                 core_delete_hba(lun0_hba);
1625                 lun0_hba = NULL;
1626         }
1627         return ret;
1628 }
1629
1630
1631 void core_dev_release_virtual_lun0(void)
1632 {
1633         struct se_hba *hba = lun0_hba;
1634         struct se_subsystem_dev *su_dev = lun0_su_dev;
1635
1636         if (!hba)
1637                 return;
1638
1639         if (g_lun0_dev)
1640                 se_free_virtual_device(g_lun0_dev, hba);
1641
1642         kfree(su_dev);
1643         core_delete_hba(hba);
1644 }