[SCSI] target: Fix interrupt context bug with stats_lock and core_tmr_alloc_req
[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 iSCSI 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
42 #include <target/target_core_base.h>
43 #include <target/target_core_device.h>
44 #include <target/target_core_tpg.h>
45 #include <target/target_core_transport.h>
46 #include <target/target_core_fabric_ops.h>
47
48 #include "target_core_alua.h"
49 #include "target_core_hba.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 int transport_get_lun_for_cmd(
57         struct se_cmd *se_cmd,
58         unsigned char *cdb,
59         u32 unpacked_lun)
60 {
61         struct se_dev_entry *deve;
62         struct se_lun *se_lun = NULL;
63         struct se_session *se_sess = SE_SESS(se_cmd);
64         unsigned long flags;
65         int read_only = 0;
66
67         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
68         deve = se_cmd->se_deve =
69                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
70         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
71                 if (se_cmd) {
72                         deve->total_cmds++;
73                         deve->total_bytes += se_cmd->data_length;
74
75                         if (se_cmd->data_direction == DMA_TO_DEVICE) {
76                                 if (deve->lun_flags &
77                                                 TRANSPORT_LUNFLAGS_READ_ONLY) {
78                                         read_only = 1;
79                                         goto out;
80                                 }
81                                 deve->write_bytes += se_cmd->data_length;
82                         } else if (se_cmd->data_direction ==
83                                    DMA_FROM_DEVICE) {
84                                 deve->read_bytes += se_cmd->data_length;
85                         }
86                 }
87                 deve->deve_cmds++;
88
89                 se_lun = se_cmd->se_lun = deve->se_lun;
90                 se_cmd->pr_res_key = deve->pr_res_key;
91                 se_cmd->orig_fe_lun = unpacked_lun;
92                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
93                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
94         }
95 out:
96         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
97
98         if (!se_lun) {
99                 if (read_only) {
100                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
101                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
102                         printk("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
103                                 " Access for 0x%08x\n",
104                                 CMD_TFO(se_cmd)->get_fabric_name(),
105                                 unpacked_lun);
106                         return -1;
107                 } else {
108                         /*
109                          * Use the se_portal_group->tpg_virt_lun0 to allow for
110                          * REPORT_LUNS, et al to be returned when no active
111                          * MappedLUN=0 exists for this Initiator Port.
112                          */
113                         if (unpacked_lun != 0) {
114                                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
115                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
116                                 printk("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
117                                         " Access for 0x%08x\n",
118                                         CMD_TFO(se_cmd)->get_fabric_name(),
119                                         unpacked_lun);
120                                 return -1;
121                         }
122                         /*
123                          * Force WRITE PROTECT for virtual LUN 0
124                          */
125                         if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
126                             (se_cmd->data_direction != DMA_NONE)) {
127                                 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
128                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
129                                 return -1;
130                         }
131 #if 0
132                         printk("TARGET_CORE[%s]: Using virtual LUN0! :-)\n",
133                                 CMD_TFO(se_cmd)->get_fabric_name());
134 #endif
135                         se_lun = se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
136                         se_cmd->orig_fe_lun = 0;
137                         se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
138                         se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
139                 }
140         }
141         /*
142          * Determine if the struct se_lun is online.
143          */
144 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
145         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
146                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
147                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
148                 return -1;
149         }
150
151         {
152         struct se_device *dev = se_lun->lun_se_dev;
153         spin_lock_irq(&dev->stats_lock);
154         dev->num_cmds++;
155         if (se_cmd->data_direction == DMA_TO_DEVICE)
156                 dev->write_bytes += se_cmd->data_length;
157         else if (se_cmd->data_direction == DMA_FROM_DEVICE)
158                 dev->read_bytes += se_cmd->data_length;
159         spin_unlock_irq(&dev->stats_lock);
160         }
161
162         /*
163          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
164          * for tracking state of struct se_cmds during LUN shutdown events.
165          */
166         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
167         list_add_tail(&se_cmd->se_lun_list, &se_lun->lun_cmd_list);
168         atomic_set(&T_TASK(se_cmd)->transport_lun_active, 1);
169 #if 0
170         printk(KERN_INFO "Adding ITT: 0x%08x to LUN LIST[%d]\n",
171                 CMD_TFO(se_cmd)->get_task_tag(se_cmd), se_lun->unpacked_lun);
172 #endif
173         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
174
175         return 0;
176 }
177 EXPORT_SYMBOL(transport_get_lun_for_cmd);
178
179 int transport_get_lun_for_tmr(
180         struct se_cmd *se_cmd,
181         u32 unpacked_lun)
182 {
183         struct se_device *dev = NULL;
184         struct se_dev_entry *deve;
185         struct se_lun *se_lun = NULL;
186         struct se_session *se_sess = SE_SESS(se_cmd);
187         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
188
189         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
190         deve = se_cmd->se_deve =
191                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
192         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
193                 se_lun = se_cmd->se_lun = se_tmr->tmr_lun = deve->se_lun;
194                 dev = se_tmr->tmr_dev = se_lun->lun_se_dev;
195                 se_cmd->pr_res_key = deve->pr_res_key;
196                 se_cmd->orig_fe_lun = unpacked_lun;
197                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
198 /*              se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; */
199         }
200         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
201
202         if (!se_lun) {
203                 printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
204                         " Access for 0x%08x\n",
205                         CMD_TFO(se_cmd)->get_fabric_name(),
206                         unpacked_lun);
207                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
208                 return -1;
209         }
210         /*
211          * Determine if the struct se_lun is online.
212          */
213 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
214         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
215                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
216                 return -1;
217         }
218
219         spin_lock(&dev->se_tmr_lock);
220         list_add_tail(&se_tmr->tmr_list, &dev->dev_tmr_list);
221         spin_unlock(&dev->se_tmr_lock);
222
223         return 0;
224 }
225 EXPORT_SYMBOL(transport_get_lun_for_tmr);
226
227 /*
228  * This function is called from core_scsi3_emulate_pro_register_and_move()
229  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
230  * when a matching rtpi is found.
231  */
232 struct se_dev_entry *core_get_se_deve_from_rtpi(
233         struct se_node_acl *nacl,
234         u16 rtpi)
235 {
236         struct se_dev_entry *deve;
237         struct se_lun *lun;
238         struct se_port *port;
239         struct se_portal_group *tpg = nacl->se_tpg;
240         u32 i;
241
242         spin_lock_irq(&nacl->device_list_lock);
243         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
244                 deve = &nacl->device_list[i];
245
246                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
247                         continue;
248
249                 lun = deve->se_lun;
250                 if (!(lun)) {
251                         printk(KERN_ERR "%s device entries device pointer is"
252                                 " NULL, but Initiator has access.\n",
253                                 TPG_TFO(tpg)->get_fabric_name());
254                         continue;
255                 }
256                 port = lun->lun_sep;
257                 if (!(port)) {
258                         printk(KERN_ERR "%s device entries device pointer is"
259                                 " NULL, but Initiator has access.\n",
260                                 TPG_TFO(tpg)->get_fabric_name());
261                         continue;
262                 }
263                 if (port->sep_rtpi != rtpi)
264                         continue;
265
266                 atomic_inc(&deve->pr_ref_count);
267                 smp_mb__after_atomic_inc();
268                 spin_unlock_irq(&nacl->device_list_lock);
269
270                 return deve;
271         }
272         spin_unlock_irq(&nacl->device_list_lock);
273
274         return NULL;
275 }
276
277 int core_free_device_list_for_node(
278         struct se_node_acl *nacl,
279         struct se_portal_group *tpg)
280 {
281         struct se_dev_entry *deve;
282         struct se_lun *lun;
283         u32 i;
284
285         if (!nacl->device_list)
286                 return 0;
287
288         spin_lock_irq(&nacl->device_list_lock);
289         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
290                 deve = &nacl->device_list[i];
291
292                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
293                         continue;
294
295                 if (!deve->se_lun) {
296                         printk(KERN_ERR "%s device entries device pointer is"
297                                 " NULL, but Initiator has access.\n",
298                                 TPG_TFO(tpg)->get_fabric_name());
299                         continue;
300                 }
301                 lun = deve->se_lun;
302
303                 spin_unlock_irq(&nacl->device_list_lock);
304                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
305                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
306                 spin_lock_irq(&nacl->device_list_lock);
307         }
308         spin_unlock_irq(&nacl->device_list_lock);
309
310         kfree(nacl->device_list);
311         nacl->device_list = NULL;
312
313         return 0;
314 }
315
316 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
317 {
318         struct se_dev_entry *deve;
319
320         spin_lock_irq(&se_nacl->device_list_lock);
321         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
322         deve->deve_cmds--;
323         spin_unlock_irq(&se_nacl->device_list_lock);
324
325         return;
326 }
327
328 void core_update_device_list_access(
329         u32 mapped_lun,
330         u32 lun_access,
331         struct se_node_acl *nacl)
332 {
333         struct se_dev_entry *deve;
334
335         spin_lock_irq(&nacl->device_list_lock);
336         deve = &nacl->device_list[mapped_lun];
337         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
338                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
339                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
340         } else {
341                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
342                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
343         }
344         spin_unlock_irq(&nacl->device_list_lock);
345
346         return;
347 }
348
349 /*      core_update_device_list_for_node():
350  *
351  *
352  */
353 int core_update_device_list_for_node(
354         struct se_lun *lun,
355         struct se_lun_acl *lun_acl,
356         u32 mapped_lun,
357         u32 lun_access,
358         struct se_node_acl *nacl,
359         struct se_portal_group *tpg,
360         int enable)
361 {
362         struct se_port *port = lun->lun_sep;
363         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
364         int trans = 0;
365         /*
366          * If the MappedLUN entry is being disabled, the entry in
367          * port->sep_alua_list must be removed now before clearing the
368          * struct se_dev_entry pointers below as logic in
369          * core_alua_do_transition_tg_pt() depends on these being present.
370          */
371         if (!(enable)) {
372                 /*
373                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
374                  * that have not been explicitly concerted to MappedLUNs ->
375                  * struct se_lun_acl, but we remove deve->alua_port_list from
376                  * port->sep_alua_list. This also means that active UAs and
377                  * NodeACL context specific PR metadata for demo-mode
378                  * MappedLUN *deve will be released below..
379                  */
380                 spin_lock_bh(&port->sep_alua_lock);
381                 list_del(&deve->alua_port_list);
382                 spin_unlock_bh(&port->sep_alua_lock);
383         }
384
385         spin_lock_irq(&nacl->device_list_lock);
386         if (enable) {
387                 /*
388                  * Check if the call is handling demo mode -> explict LUN ACL
389                  * transition.  This transition must be for the same struct se_lun
390                  * + mapped_lun that was setup in demo mode..
391                  */
392                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
393                         if (deve->se_lun_acl != NULL) {
394                                 printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
395                                         " already set for demo mode -> explict"
396                                         " LUN ACL transition\n");
397                                 spin_unlock_irq(&nacl->device_list_lock);
398                                 return -1;
399                         }
400                         if (deve->se_lun != lun) {
401                                 printk(KERN_ERR "struct se_dev_entry->se_lun does"
402                                         " match passed struct se_lun for demo mode"
403                                         " -> explict LUN ACL transition\n");
404                                 spin_unlock_irq(&nacl->device_list_lock);
405                                 return -1;
406                         }
407                         deve->se_lun_acl = lun_acl;
408                         trans = 1;
409                 } else {
410                         deve->se_lun = lun;
411                         deve->se_lun_acl = lun_acl;
412                         deve->mapped_lun = mapped_lun;
413                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
414                 }
415
416                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
417                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
418                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
419                 } else {
420                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
421                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
422                 }
423
424                 if (trans) {
425                         spin_unlock_irq(&nacl->device_list_lock);
426                         return 0;
427                 }
428                 deve->creation_time = get_jiffies_64();
429                 deve->attach_count++;
430                 spin_unlock_irq(&nacl->device_list_lock);
431
432                 spin_lock_bh(&port->sep_alua_lock);
433                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
434                 spin_unlock_bh(&port->sep_alua_lock);
435
436                 return 0;
437         }
438         /*
439          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
440          * PR operation to complete.
441          */
442         spin_unlock_irq(&nacl->device_list_lock);
443         while (atomic_read(&deve->pr_ref_count) != 0)
444                 cpu_relax();
445         spin_lock_irq(&nacl->device_list_lock);
446         /*
447          * Disable struct se_dev_entry LUN ACL mapping
448          */
449         core_scsi3_ua_release_all(deve);
450         deve->se_lun = NULL;
451         deve->se_lun_acl = NULL;
452         deve->lun_flags = 0;
453         deve->creation_time = 0;
454         deve->attach_count--;
455         spin_unlock_irq(&nacl->device_list_lock);
456
457         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
458         return 0;
459 }
460
461 /*      core_clear_lun_from_tpg():
462  *
463  *
464  */
465 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
466 {
467         struct se_node_acl *nacl;
468         struct se_dev_entry *deve;
469         u32 i;
470
471         spin_lock_bh(&tpg->acl_node_lock);
472         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
473                 spin_unlock_bh(&tpg->acl_node_lock);
474
475                 spin_lock_irq(&nacl->device_list_lock);
476                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
477                         deve = &nacl->device_list[i];
478                         if (lun != deve->se_lun)
479                                 continue;
480                         spin_unlock_irq(&nacl->device_list_lock);
481
482                         core_update_device_list_for_node(lun, NULL,
483                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
484                                 nacl, tpg, 0);
485
486                         spin_lock_irq(&nacl->device_list_lock);
487                 }
488                 spin_unlock_irq(&nacl->device_list_lock);
489
490                 spin_lock_bh(&tpg->acl_node_lock);
491         }
492         spin_unlock_bh(&tpg->acl_node_lock);
493
494         return;
495 }
496
497 static struct se_port *core_alloc_port(struct se_device *dev)
498 {
499         struct se_port *port, *port_tmp;
500
501         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
502         if (!(port)) {
503                 printk(KERN_ERR "Unable to allocate struct se_port\n");
504                 return NULL;
505         }
506         INIT_LIST_HEAD(&port->sep_alua_list);
507         INIT_LIST_HEAD(&port->sep_list);
508         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
509         spin_lock_init(&port->sep_alua_lock);
510         mutex_init(&port->sep_tg_pt_md_mutex);
511
512         spin_lock(&dev->se_port_lock);
513         if (dev->dev_port_count == 0x0000ffff) {
514                 printk(KERN_WARNING "Reached dev->dev_port_count =="
515                                 " 0x0000ffff\n");
516                 spin_unlock(&dev->se_port_lock);
517                 return NULL;
518         }
519 again:
520         /*
521          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
522          * Here is the table from spc4r17 section 7.7.3.8.
523          *
524          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
525          *
526          * Code      Description
527          * 0h        Reserved
528          * 1h        Relative port 1, historically known as port A
529          * 2h        Relative port 2, historically known as port B
530          * 3h to FFFFh    Relative port 3 through 65 535
531          */
532         port->sep_rtpi = dev->dev_rpti_counter++;
533         if (!(port->sep_rtpi))
534                 goto again;
535
536         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
537                 /*
538                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
539                  * for 16-bit wrap..
540                  */
541                 if (port->sep_rtpi == port_tmp->sep_rtpi)
542                         goto again;
543         }
544         spin_unlock(&dev->se_port_lock);
545
546         return port;
547 }
548
549 static void core_export_port(
550         struct se_device *dev,
551         struct se_portal_group *tpg,
552         struct se_port *port,
553         struct se_lun *lun)
554 {
555         struct se_subsystem_dev *su_dev = SU_DEV(dev);
556         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
557
558         spin_lock(&dev->se_port_lock);
559         spin_lock(&lun->lun_sep_lock);
560         port->sep_tpg = tpg;
561         port->sep_lun = lun;
562         lun->lun_sep = port;
563         spin_unlock(&lun->lun_sep_lock);
564
565         list_add_tail(&port->sep_list, &dev->dev_sep_list);
566         spin_unlock(&dev->se_port_lock);
567
568         if (T10_ALUA(su_dev)->alua_type == SPC3_ALUA_EMULATED) {
569                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
570                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
571                         printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
572                                         "_gp_member_t\n");
573                         return;
574                 }
575                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
576                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
577                         T10_ALUA(su_dev)->default_tg_pt_gp);
578                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
579                 printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
580                         " Group: alua/default_tg_pt_gp\n",
581                         TRANSPORT(dev)->name, TPG_TFO(tpg)->get_fabric_name());
582         }
583
584         dev->dev_port_count++;
585         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
586 }
587
588 /*
589  *      Called with struct se_device->se_port_lock spinlock held.
590  */
591 static void core_release_port(struct se_device *dev, struct se_port *port)
592         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
593 {
594         /*
595          * Wait for any port reference for PR ALL_TG_PT=1 operation
596          * to complete in __core_scsi3_alloc_registration()
597          */
598         spin_unlock(&dev->se_port_lock);
599         if (atomic_read(&port->sep_tg_pt_ref_cnt))
600                 cpu_relax();
601         spin_lock(&dev->se_port_lock);
602
603         core_alua_free_tg_pt_gp_mem(port);
604
605         list_del(&port->sep_list);
606         dev->dev_port_count--;
607         kfree(port);
608
609         return;
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 (!(port))
621                 return -1;
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 transport_core_report_lun_response(struct se_cmd *se_cmd)
655 {
656         struct se_dev_entry *deve;
657         struct se_lun *se_lun;
658         struct se_session *se_sess = SE_SESS(se_cmd);
659         struct se_task *se_task;
660         unsigned char *buf = (unsigned char *)T_TASK(se_cmd)->t_task_buf;
661         u32 cdb_offset = 0, lun_count = 0, offset = 8;
662         u64 i, lun;
663
664         list_for_each_entry(se_task, &T_TASK(se_cmd)->t_task_list, t_list)
665                 break;
666
667         if (!(se_task)) {
668                 printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
669                 return PYX_TRANSPORT_LU_COMM_FAILURE;
670         }
671
672         /*
673          * If no struct se_session pointer is present, this struct se_cmd is
674          * coming via a target_core_mod PASSTHROUGH op, and not through
675          * a $FABRIC_MOD.  In that case, report LUN=0 only.
676          */
677         if (!(se_sess)) {
678                 lun = 0;
679                 buf[offset++] = ((lun >> 56) & 0xff);
680                 buf[offset++] = ((lun >> 48) & 0xff);
681                 buf[offset++] = ((lun >> 40) & 0xff);
682                 buf[offset++] = ((lun >> 32) & 0xff);
683                 buf[offset++] = ((lun >> 24) & 0xff);
684                 buf[offset++] = ((lun >> 16) & 0xff);
685                 buf[offset++] = ((lun >> 8) & 0xff);
686                 buf[offset++] = (lun & 0xff);
687                 lun_count = 1;
688                 goto done;
689         }
690
691         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
692         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
693                 deve = &SE_NODE_ACL(se_sess)->device_list[i];
694                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
695                         continue;
696                 se_lun = deve->se_lun;
697                 /*
698                  * We determine the correct LUN LIST LENGTH even once we
699                  * have reached the initial allocation length.
700                  * See SPC2-R20 7.19.
701                  */
702                 lun_count++;
703                 if ((cdb_offset + 8) >= se_cmd->data_length)
704                         continue;
705
706                 lun = cpu_to_be64(CMD_TFO(se_cmd)->pack_lun(deve->mapped_lun));
707                 buf[offset++] = ((lun >> 56) & 0xff);
708                 buf[offset++] = ((lun >> 48) & 0xff);
709                 buf[offset++] = ((lun >> 40) & 0xff);
710                 buf[offset++] = ((lun >> 32) & 0xff);
711                 buf[offset++] = ((lun >> 24) & 0xff);
712                 buf[offset++] = ((lun >> 16) & 0xff);
713                 buf[offset++] = ((lun >> 8) & 0xff);
714                 buf[offset++] = (lun & 0xff);
715                 cdb_offset += 8;
716         }
717         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
718
719         /*
720          * See SPC3 r07, page 159.
721          */
722 done:
723         lun_count *= 8;
724         buf[0] = ((lun_count >> 24) & 0xff);
725         buf[1] = ((lun_count >> 16) & 0xff);
726         buf[2] = ((lun_count >> 8) & 0xff);
727         buf[3] = (lun_count & 0xff);
728
729         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
730 }
731
732 /*      se_release_device_for_hba():
733  *
734  *
735  */
736 void se_release_device_for_hba(struct se_device *dev)
737 {
738         struct se_hba *hba = dev->se_hba;
739
740         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
741             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
742             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
743             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
744             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
745                 se_dev_stop(dev);
746
747         if (dev->dev_ptr) {
748                 kthread_stop(dev->process_thread);
749                 if (dev->transport->free_device)
750                         dev->transport->free_device(dev->dev_ptr);
751         }
752
753         spin_lock(&hba->device_lock);
754         list_del(&dev->dev_list);
755         hba->dev_count--;
756         spin_unlock(&hba->device_lock);
757
758         core_scsi3_free_all_registrations(dev);
759         se_release_vpd_for_dev(dev);
760
761         kfree(dev->dev_status_queue_obj);
762         kfree(dev->dev_queue_obj);
763         kfree(dev);
764
765         return;
766 }
767
768 void se_release_vpd_for_dev(struct se_device *dev)
769 {
770         struct t10_vpd *vpd, *vpd_tmp;
771
772         spin_lock(&DEV_T10_WWN(dev)->t10_vpd_lock);
773         list_for_each_entry_safe(vpd, vpd_tmp,
774                         &DEV_T10_WWN(dev)->t10_vpd_list, vpd_list) {
775                 list_del(&vpd->vpd_list);
776                 kfree(vpd);
777         }
778         spin_unlock(&DEV_T10_WWN(dev)->t10_vpd_lock);
779
780         return;
781 }
782
783 /*      se_free_virtual_device():
784  *
785  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
786  */
787 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
788 {
789         if (!list_empty(&dev->dev_sep_list))
790                 dump_stack();
791
792         core_alua_free_lu_gp_mem(dev);
793         se_release_device_for_hba(dev);
794
795         return 0;
796 }
797
798 static void se_dev_start(struct se_device *dev)
799 {
800         struct se_hba *hba = dev->se_hba;
801
802         spin_lock(&hba->device_lock);
803         atomic_inc(&dev->dev_obj.obj_access_count);
804         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
805                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
806                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
807                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
808                 } else if (dev->dev_status &
809                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
810                         dev->dev_status &=
811                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
812                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
813                 }
814         }
815         spin_unlock(&hba->device_lock);
816 }
817
818 static void se_dev_stop(struct se_device *dev)
819 {
820         struct se_hba *hba = dev->se_hba;
821
822         spin_lock(&hba->device_lock);
823         atomic_dec(&dev->dev_obj.obj_access_count);
824         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
825                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
826                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
827                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
828                 } else if (dev->dev_status &
829                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
830                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
831                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
832                 }
833         }
834         spin_unlock(&hba->device_lock);
835 }
836
837 int se_dev_check_online(struct se_device *dev)
838 {
839         int ret;
840
841         spin_lock_irq(&dev->dev_status_lock);
842         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
843                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
844         spin_unlock_irq(&dev->dev_status_lock);
845
846         return ret;
847 }
848
849 int se_dev_check_shutdown(struct se_device *dev)
850 {
851         int ret;
852
853         spin_lock_irq(&dev->dev_status_lock);
854         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
855         spin_unlock_irq(&dev->dev_status_lock);
856
857         return ret;
858 }
859
860 void se_dev_set_default_attribs(
861         struct se_device *dev,
862         struct se_dev_limits *dev_limits)
863 {
864         struct queue_limits *limits = &dev_limits->limits;
865
866         DEV_ATTRIB(dev)->emulate_dpo = DA_EMULATE_DPO;
867         DEV_ATTRIB(dev)->emulate_fua_write = DA_EMULATE_FUA_WRITE;
868         DEV_ATTRIB(dev)->emulate_fua_read = DA_EMULATE_FUA_READ;
869         DEV_ATTRIB(dev)->emulate_write_cache = DA_EMULATE_WRITE_CACHE;
870         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
871         DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
872         DEV_ATTRIB(dev)->emulate_tpu = DA_EMULATE_TPU;
873         DEV_ATTRIB(dev)->emulate_tpws = DA_EMULATE_TPWS;
874         DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
875         DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
876         DEV_ATTRIB(dev)->enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
877         /*
878          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
879          * iblock_create_virtdevice() from struct queue_limits values
880          * if blk_queue_discard()==1
881          */
882         DEV_ATTRIB(dev)->max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
883         DEV_ATTRIB(dev)->max_unmap_block_desc_count =
884                                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
885         DEV_ATTRIB(dev)->unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
886         DEV_ATTRIB(dev)->unmap_granularity_alignment =
887                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
888         /*
889          * block_size is based on subsystem plugin dependent requirements.
890          */
891         DEV_ATTRIB(dev)->hw_block_size = limits->logical_block_size;
892         DEV_ATTRIB(dev)->block_size = limits->logical_block_size;
893         /*
894          * max_sectors is based on subsystem plugin dependent requirements.
895          */
896         DEV_ATTRIB(dev)->hw_max_sectors = limits->max_hw_sectors;
897         DEV_ATTRIB(dev)->max_sectors = limits->max_sectors;
898         /*
899          * Set optimal_sectors from max_sectors, which can be lowered via
900          * configfs.
901          */
902         DEV_ATTRIB(dev)->optimal_sectors = limits->max_sectors;
903         /*
904          * queue_depth is based on subsystem plugin dependent requirements.
905          */
906         DEV_ATTRIB(dev)->hw_queue_depth = dev_limits->hw_queue_depth;
907         DEV_ATTRIB(dev)->queue_depth = dev_limits->queue_depth;
908 }
909
910 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
911 {
912         if (task_timeout > DA_TASK_TIMEOUT_MAX) {
913                 printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
914                         " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
915                 return -1;
916         } else {
917                 DEV_ATTRIB(dev)->task_timeout = task_timeout;
918                 printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
919                         dev, task_timeout);
920         }
921
922         return 0;
923 }
924
925 int se_dev_set_max_unmap_lba_count(
926         struct se_device *dev,
927         u32 max_unmap_lba_count)
928 {
929         DEV_ATTRIB(dev)->max_unmap_lba_count = max_unmap_lba_count;
930         printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
931                         dev, DEV_ATTRIB(dev)->max_unmap_lba_count);
932         return 0;
933 }
934
935 int se_dev_set_max_unmap_block_desc_count(
936         struct se_device *dev,
937         u32 max_unmap_block_desc_count)
938 {
939         DEV_ATTRIB(dev)->max_unmap_block_desc_count = max_unmap_block_desc_count;
940         printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
941                         dev, DEV_ATTRIB(dev)->max_unmap_block_desc_count);
942         return 0;
943 }
944
945 int se_dev_set_unmap_granularity(
946         struct se_device *dev,
947         u32 unmap_granularity)
948 {
949         DEV_ATTRIB(dev)->unmap_granularity = unmap_granularity;
950         printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
951                         dev, DEV_ATTRIB(dev)->unmap_granularity);
952         return 0;
953 }
954
955 int se_dev_set_unmap_granularity_alignment(
956         struct se_device *dev,
957         u32 unmap_granularity_alignment)
958 {
959         DEV_ATTRIB(dev)->unmap_granularity_alignment = unmap_granularity_alignment;
960         printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
961                         dev, DEV_ATTRIB(dev)->unmap_granularity_alignment);
962         return 0;
963 }
964
965 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
966 {
967         if ((flag != 0) && (flag != 1)) {
968                 printk(KERN_ERR "Illegal value %d\n", flag);
969                 return -1;
970         }
971         if (TRANSPORT(dev)->dpo_emulated == NULL) {
972                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated is NULL\n");
973                 return -1;
974         }
975         if (TRANSPORT(dev)->dpo_emulated(dev) == 0) {
976                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated not supported\n");
977                 return -1;
978         }
979         DEV_ATTRIB(dev)->emulate_dpo = flag;
980         printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
981                         " bit: %d\n", dev, DEV_ATTRIB(dev)->emulate_dpo);
982         return 0;
983 }
984
985 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
986 {
987         if ((flag != 0) && (flag != 1)) {
988                 printk(KERN_ERR "Illegal value %d\n", flag);
989                 return -1;
990         }
991         if (TRANSPORT(dev)->fua_write_emulated == NULL) {
992                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated is NULL\n");
993                 return -1;
994         }
995         if (TRANSPORT(dev)->fua_write_emulated(dev) == 0) {
996                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated not supported\n");
997                 return -1;
998         }
999         DEV_ATTRIB(dev)->emulate_fua_write = flag;
1000         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
1001                         dev, DEV_ATTRIB(dev)->emulate_fua_write);
1002         return 0;
1003 }
1004
1005 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
1006 {
1007         if ((flag != 0) && (flag != 1)) {
1008                 printk(KERN_ERR "Illegal value %d\n", flag);
1009                 return -1;
1010         }
1011         if (TRANSPORT(dev)->fua_read_emulated == NULL) {
1012                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated is NULL\n");
1013                 return -1;
1014         }
1015         if (TRANSPORT(dev)->fua_read_emulated(dev) == 0) {
1016                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated not supported\n");
1017                 return -1;
1018         }
1019         DEV_ATTRIB(dev)->emulate_fua_read = flag;
1020         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
1021                         dev, DEV_ATTRIB(dev)->emulate_fua_read);
1022         return 0;
1023 }
1024
1025 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1026 {
1027         if ((flag != 0) && (flag != 1)) {
1028                 printk(KERN_ERR "Illegal value %d\n", flag);
1029                 return -1;
1030         }
1031         if (TRANSPORT(dev)->write_cache_emulated == NULL) {
1032                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated is NULL\n");
1033                 return -1;
1034         }
1035         if (TRANSPORT(dev)->write_cache_emulated(dev) == 0) {
1036                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated not supported\n");
1037                 return -1;
1038         }
1039         DEV_ATTRIB(dev)->emulate_write_cache = flag;
1040         printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1041                         dev, DEV_ATTRIB(dev)->emulate_write_cache);
1042         return 0;
1043 }
1044
1045 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1046 {
1047         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1048                 printk(KERN_ERR "Illegal value %d\n", flag);
1049                 return -1;
1050         }
1051
1052         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1053                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1054                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1055                         " exists\n", dev,
1056                         atomic_read(&dev->dev_export_obj.obj_access_count));
1057                 return -1;
1058         }
1059         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
1060         printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1061                 dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
1062
1063         return 0;
1064 }
1065
1066 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1067 {
1068         if ((flag != 0) && (flag != 1)) {
1069                 printk(KERN_ERR "Illegal value %d\n", flag);
1070                 return -1;
1071         }
1072
1073         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1074                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
1075                         " dev_export_obj: %d count exists\n", dev,
1076                         atomic_read(&dev->dev_export_obj.obj_access_count));
1077                 return -1;
1078         }
1079         DEV_ATTRIB(dev)->emulate_tas = flag;
1080         printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1081                 dev, (DEV_ATTRIB(dev)->emulate_tas) ? "Enabled" : "Disabled");
1082
1083         return 0;
1084 }
1085
1086 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1087 {
1088         if ((flag != 0) && (flag != 1)) {
1089                 printk(KERN_ERR "Illegal value %d\n", flag);
1090                 return -1;
1091         }
1092         /*
1093          * We expect this value to be non-zero when generic Block Layer
1094          * Discard supported is detected iblock_create_virtdevice().
1095          */
1096         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1097                 printk(KERN_ERR "Generic Block Discard not supported\n");
1098                 return -ENOSYS;
1099         }
1100
1101         DEV_ATTRIB(dev)->emulate_tpu = flag;
1102         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1103                                 dev, flag);
1104         return 0;
1105 }
1106
1107 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1108 {
1109         if ((flag != 0) && (flag != 1)) {
1110                 printk(KERN_ERR "Illegal value %d\n", flag);
1111                 return -1;
1112         }
1113         /*
1114          * We expect this value to be non-zero when generic Block Layer
1115          * Discard supported is detected iblock_create_virtdevice().
1116          */
1117         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1118                 printk(KERN_ERR "Generic Block Discard not supported\n");
1119                 return -ENOSYS;
1120         }
1121
1122         DEV_ATTRIB(dev)->emulate_tpws = flag;
1123         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1124                                 dev, flag);
1125         return 0;
1126 }
1127
1128 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1129 {
1130         if ((flag != 0) && (flag != 1)) {
1131                 printk(KERN_ERR "Illegal value %d\n", flag);
1132                 return -1;
1133         }
1134         DEV_ATTRIB(dev)->enforce_pr_isids = flag;
1135         printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1136                 (DEV_ATTRIB(dev)->enforce_pr_isids) ? "Enabled" : "Disabled");
1137         return 0;
1138 }
1139
1140 /*
1141  * Note, this can only be called on unexported SE Device Object.
1142  */
1143 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1144 {
1145         u32 orig_queue_depth = dev->queue_depth;
1146
1147         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1148                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
1149                         " dev_export_obj: %d count exists\n", dev,
1150                         atomic_read(&dev->dev_export_obj.obj_access_count));
1151                 return -1;
1152         }
1153         if (!(queue_depth)) {
1154                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
1155                         "_depth\n", dev);
1156                 return -1;
1157         }
1158
1159         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1160                 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1161                         printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
1162                                 " exceeds TCM/SE_Device TCQ: %u\n",
1163                                 dev, queue_depth,
1164                                 DEV_ATTRIB(dev)->hw_queue_depth);
1165                         return -1;
1166                 }
1167         } else {
1168                 if (queue_depth > DEV_ATTRIB(dev)->queue_depth) {
1169                         if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1170                                 printk(KERN_ERR "dev[%p]: Passed queue_depth:"
1171                                         " %u exceeds TCM/SE_Device MAX"
1172                                         " TCQ: %u\n", dev, queue_depth,
1173                                         DEV_ATTRIB(dev)->hw_queue_depth);
1174                                 return -1;
1175                         }
1176                 }
1177         }
1178
1179         DEV_ATTRIB(dev)->queue_depth = dev->queue_depth = queue_depth;
1180         if (queue_depth > orig_queue_depth)
1181                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1182         else if (queue_depth < orig_queue_depth)
1183                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1184
1185         printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
1186                         dev, queue_depth);
1187         return 0;
1188 }
1189
1190 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1191 {
1192         int force = 0; /* Force setting for VDEVS */
1193
1194         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1195                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1196                         " max_sectors while dev_export_obj: %d count exists\n",
1197                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1198                 return -1;
1199         }
1200         if (!(max_sectors)) {
1201                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
1202                         " max_sectors\n", dev);
1203                 return -1;
1204         }
1205         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1206                 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
1207                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1208                                 DA_STATUS_MAX_SECTORS_MIN);
1209                 return -1;
1210         }
1211         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1212                 if (max_sectors > DEV_ATTRIB(dev)->hw_max_sectors) {
1213                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1214                                 " greater than TCM/SE_Device max_sectors:"
1215                                 " %u\n", dev, max_sectors,
1216                                 DEV_ATTRIB(dev)->hw_max_sectors);
1217                          return -1;
1218                 }
1219         } else {
1220                 if (!(force) && (max_sectors >
1221                                  DEV_ATTRIB(dev)->hw_max_sectors)) {
1222                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1223                                 " greater than TCM/SE_Device max_sectors"
1224                                 ": %u, use force=1 to override.\n", dev,
1225                                 max_sectors, DEV_ATTRIB(dev)->hw_max_sectors);
1226                         return -1;
1227                 }
1228                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1229                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1230                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1231                                 " %u\n", dev, max_sectors,
1232                                 DA_STATUS_MAX_SECTORS_MAX);
1233                         return -1;
1234                 }
1235         }
1236
1237         DEV_ATTRIB(dev)->max_sectors = max_sectors;
1238         printk("dev[%p]: SE Device max_sectors changed to %u\n",
1239                         dev, max_sectors);
1240         return 0;
1241 }
1242
1243 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1244 {
1245         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1246                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1247                         " optimal_sectors while dev_export_obj: %d count exists\n",
1248                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1249                 return -EINVAL;
1250         }
1251         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1252                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
1253                                 " changed for TCM/pSCSI\n", dev);
1254                 return -EINVAL;
1255         }
1256         if (optimal_sectors > DEV_ATTRIB(dev)->max_sectors) {
1257                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
1258                         " greater than max_sectors: %u\n", dev,
1259                         optimal_sectors, DEV_ATTRIB(dev)->max_sectors);
1260                 return -EINVAL;
1261         }
1262
1263         DEV_ATTRIB(dev)->optimal_sectors = optimal_sectors;
1264         printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
1265                         dev, optimal_sectors);
1266         return 0;
1267 }
1268
1269 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1270 {
1271         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1272                 printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
1273                         " while dev_export_obj: %d count exists\n", dev,
1274                         atomic_read(&dev->dev_export_obj.obj_access_count));
1275                 return -1;
1276         }
1277
1278         if ((block_size != 512) &&
1279             (block_size != 1024) &&
1280             (block_size != 2048) &&
1281             (block_size != 4096)) {
1282                 printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
1283                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1284                         dev, block_size);
1285                 return -1;
1286         }
1287
1288         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1289                 printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
1290                         " Physical Device, use for Linux/SCSI to change"
1291                         " block_size for underlying hardware\n", dev);
1292                 return -1;
1293         }
1294
1295         DEV_ATTRIB(dev)->block_size = block_size;
1296         printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
1297                         dev, block_size);
1298         return 0;
1299 }
1300
1301 struct se_lun *core_dev_add_lun(
1302         struct se_portal_group *tpg,
1303         struct se_hba *hba,
1304         struct se_device *dev,
1305         u32 lun)
1306 {
1307         struct se_lun *lun_p;
1308         u32 lun_access = 0;
1309
1310         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1311                 printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
1312                         atomic_read(&dev->dev_access_obj.obj_access_count));
1313                 return NULL;
1314         }
1315
1316         lun_p = core_tpg_pre_addlun(tpg, lun);
1317         if ((IS_ERR(lun_p)) || !(lun_p))
1318                 return NULL;
1319
1320         if (dev->dev_flags & DF_READ_ONLY)
1321                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1322         else
1323                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1324
1325         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1326                 return NULL;
1327
1328         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1329                 " CORE HBA: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1330                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun_p->unpacked_lun,
1331                 TPG_TFO(tpg)->get_fabric_name(), hba->hba_id);
1332         /*
1333          * Update LUN maps for dynamically added initiators when
1334          * generate_node_acl is enabled.
1335          */
1336         if (TPG_TFO(tpg)->tpg_check_demo_mode(tpg)) {
1337                 struct se_node_acl *acl;
1338                 spin_lock_bh(&tpg->acl_node_lock);
1339                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1340                         if (acl->dynamic_node_acl) {
1341                                 spin_unlock_bh(&tpg->acl_node_lock);
1342                                 core_tpg_add_node_to_devs(acl, tpg);
1343                                 spin_lock_bh(&tpg->acl_node_lock);
1344                         }
1345                 }
1346                 spin_unlock_bh(&tpg->acl_node_lock);
1347         }
1348
1349         return lun_p;
1350 }
1351
1352 /*      core_dev_del_lun():
1353  *
1354  *
1355  */
1356 int core_dev_del_lun(
1357         struct se_portal_group *tpg,
1358         u32 unpacked_lun)
1359 {
1360         struct se_lun *lun;
1361         int ret = 0;
1362
1363         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1364         if (!(lun))
1365                 return ret;
1366
1367         core_tpg_post_dellun(tpg, lun);
1368
1369         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1370                 " device object\n", TPG_TFO(tpg)->get_fabric_name(),
1371                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun,
1372                 TPG_TFO(tpg)->get_fabric_name());
1373
1374         return 0;
1375 }
1376
1377 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1378 {
1379         struct se_lun *lun;
1380
1381         spin_lock(&tpg->tpg_lun_lock);
1382         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1383                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1384                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1385                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1386                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1387                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1388                 spin_unlock(&tpg->tpg_lun_lock);
1389                 return NULL;
1390         }
1391         lun = &tpg->tpg_lun_list[unpacked_lun];
1392
1393         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1394                 printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
1395                         " Target Portal Group: %hu, ignoring request.\n",
1396                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1397                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1398                 spin_unlock(&tpg->tpg_lun_lock);
1399                 return NULL;
1400         }
1401         spin_unlock(&tpg->tpg_lun_lock);
1402
1403         return lun;
1404 }
1405
1406 /*      core_dev_get_lun():
1407  *
1408  *
1409  */
1410 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1411 {
1412         struct se_lun *lun;
1413
1414         spin_lock(&tpg->tpg_lun_lock);
1415         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1416                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1417                         "_TPG-1: %u for Target Portal Group: %hu\n",
1418                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1419                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1420                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1421                 spin_unlock(&tpg->tpg_lun_lock);
1422                 return NULL;
1423         }
1424         lun = &tpg->tpg_lun_list[unpacked_lun];
1425
1426         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1427                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1428                         " Target Portal Group: %hu, ignoring request.\n",
1429                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1430                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1431                 spin_unlock(&tpg->tpg_lun_lock);
1432                 return NULL;
1433         }
1434         spin_unlock(&tpg->tpg_lun_lock);
1435
1436         return lun;
1437 }
1438
1439 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1440         struct se_portal_group *tpg,
1441         u32 mapped_lun,
1442         char *initiatorname,
1443         int *ret)
1444 {
1445         struct se_lun_acl *lacl;
1446         struct se_node_acl *nacl;
1447
1448         if (strlen(initiatorname) > TRANSPORT_IQN_LEN) {
1449                 printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
1450                         TPG_TFO(tpg)->get_fabric_name());
1451                 *ret = -EOVERFLOW;
1452                 return NULL;
1453         }
1454         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1455         if (!(nacl)) {
1456                 *ret = -EINVAL;
1457                 return NULL;
1458         }
1459         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1460         if (!(lacl)) {
1461                 printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
1462                 *ret = -ENOMEM;
1463                 return NULL;
1464         }
1465
1466         INIT_LIST_HEAD(&lacl->lacl_list);
1467         lacl->mapped_lun = mapped_lun;
1468         lacl->se_lun_nacl = nacl;
1469         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1470
1471         return lacl;
1472 }
1473
1474 int core_dev_add_initiator_node_lun_acl(
1475         struct se_portal_group *tpg,
1476         struct se_lun_acl *lacl,
1477         u32 unpacked_lun,
1478         u32 lun_access)
1479 {
1480         struct se_lun *lun;
1481         struct se_node_acl *nacl;
1482
1483         lun = core_dev_get_lun(tpg, unpacked_lun);
1484         if (!(lun)) {
1485                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1486                         " Target Portal Group: %hu, ignoring request.\n",
1487                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1488                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1489                 return -EINVAL;
1490         }
1491
1492         nacl = lacl->se_lun_nacl;
1493         if (!(nacl))
1494                 return -EINVAL;
1495
1496         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1497             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1498                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1499
1500         lacl->se_lun = lun;
1501
1502         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1503                         lun_access, nacl, tpg, 1) < 0)
1504                 return -EINVAL;
1505
1506         spin_lock(&lun->lun_acl_lock);
1507         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1508         atomic_inc(&lun->lun_acl_count);
1509         smp_mb__after_atomic_inc();
1510         spin_unlock(&lun->lun_acl_lock);
1511
1512         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1513                 " InitiatorNode: %s\n", TPG_TFO(tpg)->get_fabric_name(),
1514                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1515                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1516                 lacl->initiatorname);
1517         /*
1518          * Check to see if there are any existing persistent reservation APTPL
1519          * pre-registrations that need to be enabled for this LUN ACL..
1520          */
1521         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1522         return 0;
1523 }
1524
1525 /*      core_dev_del_initiator_node_lun_acl():
1526  *
1527  *
1528  */
1529 int core_dev_del_initiator_node_lun_acl(
1530         struct se_portal_group *tpg,
1531         struct se_lun *lun,
1532         struct se_lun_acl *lacl)
1533 {
1534         struct se_node_acl *nacl;
1535
1536         nacl = lacl->se_lun_nacl;
1537         if (!(nacl))
1538                 return -EINVAL;
1539
1540         spin_lock(&lun->lun_acl_lock);
1541         list_del(&lacl->lacl_list);
1542         atomic_dec(&lun->lun_acl_count);
1543         smp_mb__after_atomic_dec();
1544         spin_unlock(&lun->lun_acl_lock);
1545
1546         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1547                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1548
1549         lacl->se_lun = NULL;
1550
1551         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1552                 " InitiatorNode: %s Mapped LUN: %u\n",
1553                 TPG_TFO(tpg)->get_fabric_name(),
1554                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
1555                 lacl->initiatorname, lacl->mapped_lun);
1556
1557         return 0;
1558 }
1559
1560 void core_dev_free_initiator_node_lun_acl(
1561         struct se_portal_group *tpg,
1562         struct se_lun_acl *lacl)
1563 {
1564         printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1565                 " Mapped LUN: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1566                 TPG_TFO(tpg)->tpg_get_tag(tpg),
1567                 TPG_TFO(tpg)->get_fabric_name(),
1568                 lacl->initiatorname, lacl->mapped_lun);
1569
1570         kfree(lacl);
1571 }
1572
1573 int core_dev_setup_virtual_lun0(void)
1574 {
1575         struct se_hba *hba;
1576         struct se_device *dev;
1577         struct se_subsystem_dev *se_dev = NULL;
1578         struct se_subsystem_api *t;
1579         char buf[16];
1580         int ret;
1581
1582         hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
1583         if (IS_ERR(hba))
1584                 return PTR_ERR(hba);
1585
1586         se_global->g_lun0_hba = hba;
1587         t = hba->transport;
1588
1589         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1590         if (!(se_dev)) {
1591                 printk(KERN_ERR "Unable to allocate memory for"
1592                                 " struct se_subsystem_dev\n");
1593                 ret = -ENOMEM;
1594                 goto out;
1595         }
1596         INIT_LIST_HEAD(&se_dev->g_se_dev_list);
1597         INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1598         spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1599         INIT_LIST_HEAD(&se_dev->t10_reservation.registration_list);
1600         INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
1601         spin_lock_init(&se_dev->t10_reservation.registration_lock);
1602         spin_lock_init(&se_dev->t10_reservation.aptpl_reg_lock);
1603         INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1604         spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1605         spin_lock_init(&se_dev->se_dev_lock);
1606         se_dev->t10_reservation.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1607         se_dev->t10_wwn.t10_sub_dev = se_dev;
1608         se_dev->t10_alua.t10_sub_dev = se_dev;
1609         se_dev->se_dev_attrib.da_sub_dev = se_dev;
1610         se_dev->se_dev_hba = hba;
1611
1612         se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1613         if (!(se_dev->se_dev_su_ptr)) {
1614                 printk(KERN_ERR "Unable to locate subsystem dependent pointer"
1615                         " from allocate_virtdevice()\n");
1616                 ret = -ENOMEM;
1617                 goto out;
1618         }
1619         se_global->g_lun0_su_dev = se_dev;
1620
1621         memset(buf, 0, 16);
1622         sprintf(buf, "rd_pages=8");
1623         t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1624
1625         dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1626         if (!(dev) || IS_ERR(dev)) {
1627                 ret = -ENOMEM;
1628                 goto out;
1629         }
1630         se_dev->se_dev_ptr = dev;
1631         se_global->g_lun0_dev = dev;
1632
1633         return 0;
1634 out:
1635         se_global->g_lun0_su_dev = NULL;
1636         kfree(se_dev);
1637         if (se_global->g_lun0_hba) {
1638                 core_delete_hba(se_global->g_lun0_hba);
1639                 se_global->g_lun0_hba = NULL;
1640         }
1641         return ret;
1642 }
1643
1644
1645 void core_dev_release_virtual_lun0(void)
1646 {
1647         struct se_hba *hba = se_global->g_lun0_hba;
1648         struct se_subsystem_dev *su_dev = se_global->g_lun0_su_dev;
1649
1650         if (!(hba))
1651                 return;
1652
1653         if (se_global->g_lun0_dev)
1654                 se_free_virtual_device(se_global->g_lun0_dev, hba);
1655
1656         kfree(su_dev);
1657         core_delete_hba(hba);
1658 }