[SCSI] tcm_fc: Fixing reference counting problem which was causing ft_sess to be...
[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 #include <scsi/scsi_device.h>
42
43 #include <target/target_core_base.h>
44 #include <target/target_core_device.h>
45 #include <target/target_core_tpg.h>
46 #include <target/target_core_transport.h>
47 #include <target/target_core_fabric_ops.h>
48
49 #include "target_core_alua.h"
50 #include "target_core_hba.h"
51 #include "target_core_pr.h"
52 #include "target_core_ua.h"
53
54 static void se_dev_start(struct se_device *dev);
55 static void se_dev_stop(struct se_device *dev);
56
57 int transport_get_lun_for_cmd(
58         struct se_cmd *se_cmd,
59         unsigned char *cdb,
60         u32 unpacked_lun)
61 {
62         struct se_dev_entry *deve;
63         struct se_lun *se_lun = NULL;
64         struct se_session *se_sess = SE_SESS(se_cmd);
65         unsigned long flags;
66         int read_only = 0;
67
68         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
69         deve = se_cmd->se_deve =
70                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
71         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
72                 if (se_cmd) {
73                         deve->total_cmds++;
74                         deve->total_bytes += se_cmd->data_length;
75
76                         if (se_cmd->data_direction == DMA_TO_DEVICE) {
77                                 if (deve->lun_flags &
78                                                 TRANSPORT_LUNFLAGS_READ_ONLY) {
79                                         read_only = 1;
80                                         goto out;
81                                 }
82                                 deve->write_bytes += se_cmd->data_length;
83                         } else if (se_cmd->data_direction ==
84                                    DMA_FROM_DEVICE) {
85                                 deve->read_bytes += se_cmd->data_length;
86                         }
87                 }
88                 deve->deve_cmds++;
89
90                 se_lun = se_cmd->se_lun = deve->se_lun;
91                 se_cmd->pr_res_key = deve->pr_res_key;
92                 se_cmd->orig_fe_lun = unpacked_lun;
93                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
94                 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
95         }
96 out:
97         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
98
99         if (!se_lun) {
100                 if (read_only) {
101                         se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
102                         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
103                         printk("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
104                                 " Access for 0x%08x\n",
105                                 CMD_TFO(se_cmd)->get_fabric_name(),
106                                 unpacked_lun);
107                         return -1;
108                 } else {
109                         /*
110                          * Use the se_portal_group->tpg_virt_lun0 to allow for
111                          * REPORT_LUNS, et al to be returned when no active
112                          * MappedLUN=0 exists for this Initiator Port.
113                          */
114                         if (unpacked_lun != 0) {
115                                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
116                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
117                                 printk("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
118                                         " Access for 0x%08x\n",
119                                         CMD_TFO(se_cmd)->get_fabric_name(),
120                                         unpacked_lun);
121                                 return -1;
122                         }
123                         /*
124                          * Force WRITE PROTECT for virtual LUN 0
125                          */
126                         if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
127                             (se_cmd->data_direction != DMA_NONE)) {
128                                 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
129                                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
130                                 return -1;
131                         }
132 #if 0
133                         printk("TARGET_CORE[%s]: Using virtual LUN0! :-)\n",
134                                 CMD_TFO(se_cmd)->get_fabric_name());
135 #endif
136                         se_lun = se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
137                         se_cmd->orig_fe_lun = 0;
138                         se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
139                         se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
140                 }
141         }
142         /*
143          * Determine if the struct se_lun is online.
144          */
145 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
146         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
147                 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
148                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
149                 return -1;
150         }
151
152         {
153         struct se_device *dev = se_lun->lun_se_dev;
154         spin_lock_irq(&dev->stats_lock);
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_irq(&dev->stats_lock);
161         }
162
163         /*
164          * Add the iscsi_cmd_t to the struct se_lun's cmd list.  This list is used
165          * for tracking state of struct se_cmds during LUN shutdown events.
166          */
167         spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
168         list_add_tail(&se_cmd->se_lun_list, &se_lun->lun_cmd_list);
169         atomic_set(&T_TASK(se_cmd)->transport_lun_active, 1);
170 #if 0
171         printk(KERN_INFO "Adding ITT: 0x%08x to LUN LIST[%d]\n",
172                 CMD_TFO(se_cmd)->get_task_tag(se_cmd), se_lun->unpacked_lun);
173 #endif
174         spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
175
176         return 0;
177 }
178 EXPORT_SYMBOL(transport_get_lun_for_cmd);
179
180 int transport_get_lun_for_tmr(
181         struct se_cmd *se_cmd,
182         u32 unpacked_lun)
183 {
184         struct se_device *dev = NULL;
185         struct se_dev_entry *deve;
186         struct se_lun *se_lun = NULL;
187         struct se_session *se_sess = SE_SESS(se_cmd);
188         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
189
190         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
191         deve = se_cmd->se_deve =
192                         &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
193         if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
194                 se_lun = se_cmd->se_lun = se_tmr->tmr_lun = deve->se_lun;
195                 dev = se_lun->lun_se_dev;
196                 se_cmd->pr_res_key = deve->pr_res_key;
197                 se_cmd->orig_fe_lun = unpacked_lun;
198                 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
199 /*              se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; */
200         }
201         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
202
203         if (!se_lun) {
204                 printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
205                         " Access for 0x%08x\n",
206                         CMD_TFO(se_cmd)->get_fabric_name(),
207                         unpacked_lun);
208                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
209                 return -1;
210         }
211         /*
212          * Determine if the struct se_lun is online.
213          */
214 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
215         if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
216                 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
217                 return -1;
218         }
219         se_tmr->tmr_dev = dev;
220
221         spin_lock(&dev->se_tmr_lock);
222         list_add_tail(&se_tmr->tmr_list, &dev->dev_tmr_list);
223         spin_unlock(&dev->se_tmr_lock);
224
225         return 0;
226 }
227 EXPORT_SYMBOL(transport_get_lun_for_tmr);
228
229 /*
230  * This function is called from core_scsi3_emulate_pro_register_and_move()
231  * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
232  * when a matching rtpi is found.
233  */
234 struct se_dev_entry *core_get_se_deve_from_rtpi(
235         struct se_node_acl *nacl,
236         u16 rtpi)
237 {
238         struct se_dev_entry *deve;
239         struct se_lun *lun;
240         struct se_port *port;
241         struct se_portal_group *tpg = nacl->se_tpg;
242         u32 i;
243
244         spin_lock_irq(&nacl->device_list_lock);
245         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
246                 deve = &nacl->device_list[i];
247
248                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
249                         continue;
250
251                 lun = deve->se_lun;
252                 if (!(lun)) {
253                         printk(KERN_ERR "%s device entries device pointer is"
254                                 " NULL, but Initiator has access.\n",
255                                 TPG_TFO(tpg)->get_fabric_name());
256                         continue;
257                 }
258                 port = lun->lun_sep;
259                 if (!(port)) {
260                         printk(KERN_ERR "%s device entries device pointer is"
261                                 " NULL, but Initiator has access.\n",
262                                 TPG_TFO(tpg)->get_fabric_name());
263                         continue;
264                 }
265                 if (port->sep_rtpi != rtpi)
266                         continue;
267
268                 atomic_inc(&deve->pr_ref_count);
269                 smp_mb__after_atomic_inc();
270                 spin_unlock_irq(&nacl->device_list_lock);
271
272                 return deve;
273         }
274         spin_unlock_irq(&nacl->device_list_lock);
275
276         return NULL;
277 }
278
279 int core_free_device_list_for_node(
280         struct se_node_acl *nacl,
281         struct se_portal_group *tpg)
282 {
283         struct se_dev_entry *deve;
284         struct se_lun *lun;
285         u32 i;
286
287         if (!nacl->device_list)
288                 return 0;
289
290         spin_lock_irq(&nacl->device_list_lock);
291         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
292                 deve = &nacl->device_list[i];
293
294                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
295                         continue;
296
297                 if (!deve->se_lun) {
298                         printk(KERN_ERR "%s device entries device pointer is"
299                                 " NULL, but Initiator has access.\n",
300                                 TPG_TFO(tpg)->get_fabric_name());
301                         continue;
302                 }
303                 lun = deve->se_lun;
304
305                 spin_unlock_irq(&nacl->device_list_lock);
306                 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
307                         TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
308                 spin_lock_irq(&nacl->device_list_lock);
309         }
310         spin_unlock_irq(&nacl->device_list_lock);
311
312         kfree(nacl->device_list);
313         nacl->device_list = NULL;
314
315         return 0;
316 }
317
318 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
319 {
320         struct se_dev_entry *deve;
321
322         spin_lock_irq(&se_nacl->device_list_lock);
323         deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
324         deve->deve_cmds--;
325         spin_unlock_irq(&se_nacl->device_list_lock);
326
327         return;
328 }
329
330 void core_update_device_list_access(
331         u32 mapped_lun,
332         u32 lun_access,
333         struct se_node_acl *nacl)
334 {
335         struct se_dev_entry *deve;
336
337         spin_lock_irq(&nacl->device_list_lock);
338         deve = &nacl->device_list[mapped_lun];
339         if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
340                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
341                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
342         } else {
343                 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
344                 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
345         }
346         spin_unlock_irq(&nacl->device_list_lock);
347
348         return;
349 }
350
351 /*      core_update_device_list_for_node():
352  *
353  *
354  */
355 int core_update_device_list_for_node(
356         struct se_lun *lun,
357         struct se_lun_acl *lun_acl,
358         u32 mapped_lun,
359         u32 lun_access,
360         struct se_node_acl *nacl,
361         struct se_portal_group *tpg,
362         int enable)
363 {
364         struct se_port *port = lun->lun_sep;
365         struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
366         int trans = 0;
367         /*
368          * If the MappedLUN entry is being disabled, the entry in
369          * port->sep_alua_list must be removed now before clearing the
370          * struct se_dev_entry pointers below as logic in
371          * core_alua_do_transition_tg_pt() depends on these being present.
372          */
373         if (!(enable)) {
374                 /*
375                  * deve->se_lun_acl will be NULL for demo-mode created LUNs
376                  * that have not been explicitly concerted to MappedLUNs ->
377                  * struct se_lun_acl, but we remove deve->alua_port_list from
378                  * port->sep_alua_list. This also means that active UAs and
379                  * NodeACL context specific PR metadata for demo-mode
380                  * MappedLUN *deve will be released below..
381                  */
382                 spin_lock_bh(&port->sep_alua_lock);
383                 list_del(&deve->alua_port_list);
384                 spin_unlock_bh(&port->sep_alua_lock);
385         }
386
387         spin_lock_irq(&nacl->device_list_lock);
388         if (enable) {
389                 /*
390                  * Check if the call is handling demo mode -> explict LUN ACL
391                  * transition.  This transition must be for the same struct se_lun
392                  * + mapped_lun that was setup in demo mode..
393                  */
394                 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
395                         if (deve->se_lun_acl != NULL) {
396                                 printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
397                                         " already set for demo mode -> explict"
398                                         " LUN ACL transition\n");
399                                 spin_unlock_irq(&nacl->device_list_lock);
400                                 return -1;
401                         }
402                         if (deve->se_lun != lun) {
403                                 printk(KERN_ERR "struct se_dev_entry->se_lun does"
404                                         " match passed struct se_lun for demo mode"
405                                         " -> explict LUN ACL transition\n");
406                                 spin_unlock_irq(&nacl->device_list_lock);
407                                 return -1;
408                         }
409                         deve->se_lun_acl = lun_acl;
410                         trans = 1;
411                 } else {
412                         deve->se_lun = lun;
413                         deve->se_lun_acl = lun_acl;
414                         deve->mapped_lun = mapped_lun;
415                         deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
416                 }
417
418                 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
419                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
420                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
421                 } else {
422                         deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
423                         deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
424                 }
425
426                 if (trans) {
427                         spin_unlock_irq(&nacl->device_list_lock);
428                         return 0;
429                 }
430                 deve->creation_time = get_jiffies_64();
431                 deve->attach_count++;
432                 spin_unlock_irq(&nacl->device_list_lock);
433
434                 spin_lock_bh(&port->sep_alua_lock);
435                 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
436                 spin_unlock_bh(&port->sep_alua_lock);
437
438                 return 0;
439         }
440         /*
441          * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
442          * PR operation to complete.
443          */
444         spin_unlock_irq(&nacl->device_list_lock);
445         while (atomic_read(&deve->pr_ref_count) != 0)
446                 cpu_relax();
447         spin_lock_irq(&nacl->device_list_lock);
448         /*
449          * Disable struct se_dev_entry LUN ACL mapping
450          */
451         core_scsi3_ua_release_all(deve);
452         deve->se_lun = NULL;
453         deve->se_lun_acl = NULL;
454         deve->lun_flags = 0;
455         deve->creation_time = 0;
456         deve->attach_count--;
457         spin_unlock_irq(&nacl->device_list_lock);
458
459         core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
460         return 0;
461 }
462
463 /*      core_clear_lun_from_tpg():
464  *
465  *
466  */
467 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
468 {
469         struct se_node_acl *nacl;
470         struct se_dev_entry *deve;
471         u32 i;
472
473         spin_lock_bh(&tpg->acl_node_lock);
474         list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
475                 spin_unlock_bh(&tpg->acl_node_lock);
476
477                 spin_lock_irq(&nacl->device_list_lock);
478                 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
479                         deve = &nacl->device_list[i];
480                         if (lun != deve->se_lun)
481                                 continue;
482                         spin_unlock_irq(&nacl->device_list_lock);
483
484                         core_update_device_list_for_node(lun, NULL,
485                                 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
486                                 nacl, tpg, 0);
487
488                         spin_lock_irq(&nacl->device_list_lock);
489                 }
490                 spin_unlock_irq(&nacl->device_list_lock);
491
492                 spin_lock_bh(&tpg->acl_node_lock);
493         }
494         spin_unlock_bh(&tpg->acl_node_lock);
495
496         return;
497 }
498
499 static struct se_port *core_alloc_port(struct se_device *dev)
500 {
501         struct se_port *port, *port_tmp;
502
503         port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
504         if (!(port)) {
505                 printk(KERN_ERR "Unable to allocate struct se_port\n");
506                 return NULL;
507         }
508         INIT_LIST_HEAD(&port->sep_alua_list);
509         INIT_LIST_HEAD(&port->sep_list);
510         atomic_set(&port->sep_tg_pt_secondary_offline, 0);
511         spin_lock_init(&port->sep_alua_lock);
512         mutex_init(&port->sep_tg_pt_md_mutex);
513
514         spin_lock(&dev->se_port_lock);
515         if (dev->dev_port_count == 0x0000ffff) {
516                 printk(KERN_WARNING "Reached dev->dev_port_count =="
517                                 " 0x0000ffff\n");
518                 spin_unlock(&dev->se_port_lock);
519                 return NULL;
520         }
521 again:
522         /*
523          * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
524          * Here is the table from spc4r17 section 7.7.3.8.
525          *
526          *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
527          *
528          * Code      Description
529          * 0h        Reserved
530          * 1h        Relative port 1, historically known as port A
531          * 2h        Relative port 2, historically known as port B
532          * 3h to FFFFh    Relative port 3 through 65 535
533          */
534         port->sep_rtpi = dev->dev_rpti_counter++;
535         if (!(port->sep_rtpi))
536                 goto again;
537
538         list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
539                 /*
540                  * Make sure RELATIVE TARGET PORT IDENTIFER is unique
541                  * for 16-bit wrap..
542                  */
543                 if (port->sep_rtpi == port_tmp->sep_rtpi)
544                         goto again;
545         }
546         spin_unlock(&dev->se_port_lock);
547
548         return port;
549 }
550
551 static void core_export_port(
552         struct se_device *dev,
553         struct se_portal_group *tpg,
554         struct se_port *port,
555         struct se_lun *lun)
556 {
557         struct se_subsystem_dev *su_dev = SU_DEV(dev);
558         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
559
560         spin_lock(&dev->se_port_lock);
561         spin_lock(&lun->lun_sep_lock);
562         port->sep_tpg = tpg;
563         port->sep_lun = lun;
564         lun->lun_sep = port;
565         spin_unlock(&lun->lun_sep_lock);
566
567         list_add_tail(&port->sep_list, &dev->dev_sep_list);
568         spin_unlock(&dev->se_port_lock);
569
570         if (T10_ALUA(su_dev)->alua_type == SPC3_ALUA_EMULATED) {
571                 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
572                 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
573                         printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
574                                         "_gp_member_t\n");
575                         return;
576                 }
577                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
578                 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
579                         T10_ALUA(su_dev)->default_tg_pt_gp);
580                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
581                 printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
582                         " Group: alua/default_tg_pt_gp\n",
583                         TRANSPORT(dev)->name, TPG_TFO(tpg)->get_fabric_name());
584         }
585
586         dev->dev_port_count++;
587         port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
588 }
589
590 /*
591  *      Called with struct se_device->se_port_lock spinlock held.
592  */
593 static void core_release_port(struct se_device *dev, struct se_port *port)
594         __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
595 {
596         /*
597          * Wait for any port reference for PR ALL_TG_PT=1 operation
598          * to complete in __core_scsi3_alloc_registration()
599          */
600         spin_unlock(&dev->se_port_lock);
601         if (atomic_read(&port->sep_tg_pt_ref_cnt))
602                 cpu_relax();
603         spin_lock(&dev->se_port_lock);
604
605         core_alua_free_tg_pt_gp_mem(port);
606
607         list_del(&port->sep_list);
608         dev->dev_port_count--;
609         kfree(port);
610
611         return;
612 }
613
614 int core_dev_export(
615         struct se_device *dev,
616         struct se_portal_group *tpg,
617         struct se_lun *lun)
618 {
619         struct se_port *port;
620
621         port = core_alloc_port(dev);
622         if (!(port))
623                 return -1;
624
625         lun->lun_se_dev = dev;
626         se_dev_start(dev);
627
628         atomic_inc(&dev->dev_export_obj.obj_access_count);
629         core_export_port(dev, tpg, port, lun);
630         return 0;
631 }
632
633 void core_dev_unexport(
634         struct se_device *dev,
635         struct se_portal_group *tpg,
636         struct se_lun *lun)
637 {
638         struct se_port *port = lun->lun_sep;
639
640         spin_lock(&lun->lun_sep_lock);
641         if (lun->lun_se_dev == NULL) {
642                 spin_unlock(&lun->lun_sep_lock);
643                 return;
644         }
645         spin_unlock(&lun->lun_sep_lock);
646
647         spin_lock(&dev->se_port_lock);
648         atomic_dec(&dev->dev_export_obj.obj_access_count);
649         core_release_port(dev, port);
650         spin_unlock(&dev->se_port_lock);
651
652         se_dev_stop(dev);
653         lun->lun_se_dev = NULL;
654 }
655
656 int transport_core_report_lun_response(struct se_cmd *se_cmd)
657 {
658         struct se_dev_entry *deve;
659         struct se_lun *se_lun;
660         struct se_session *se_sess = SE_SESS(se_cmd);
661         struct se_task *se_task;
662         unsigned char *buf = (unsigned char *)T_TASK(se_cmd)->t_task_buf;
663         u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
664
665         list_for_each_entry(se_task, &T_TASK(se_cmd)->t_task_list, t_list)
666                 break;
667
668         if (!(se_task)) {
669                 printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
670                 return PYX_TRANSPORT_LU_COMM_FAILURE;
671         }
672
673         /*
674          * If no struct se_session pointer is present, this struct se_cmd is
675          * coming via a target_core_mod PASSTHROUGH op, and not through
676          * a $FABRIC_MOD.  In that case, report LUN=0 only.
677          */
678         if (!(se_sess)) {
679                 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
680                 lun_count = 1;
681                 goto done;
682         }
683
684         spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
685         for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
686                 deve = &SE_NODE_ACL(se_sess)->device_list[i];
687                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
688                         continue;
689                 se_lun = deve->se_lun;
690                 /*
691                  * We determine the correct LUN LIST LENGTH even once we
692                  * have reached the initial allocation length.
693                  * See SPC2-R20 7.19.
694                  */
695                 lun_count++;
696                 if ((cdb_offset + 8) >= se_cmd->data_length)
697                         continue;
698
699                 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
700                 offset += 8;
701                 cdb_offset += 8;
702         }
703         spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
704
705         /*
706          * See SPC3 r07, page 159.
707          */
708 done:
709         lun_count *= 8;
710         buf[0] = ((lun_count >> 24) & 0xff);
711         buf[1] = ((lun_count >> 16) & 0xff);
712         buf[2] = ((lun_count >> 8) & 0xff);
713         buf[3] = (lun_count & 0xff);
714
715         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
716 }
717
718 /*      se_release_device_for_hba():
719  *
720  *
721  */
722 void se_release_device_for_hba(struct se_device *dev)
723 {
724         struct se_hba *hba = dev->se_hba;
725
726         if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
727             (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
728             (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
729             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
730             (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
731                 se_dev_stop(dev);
732
733         if (dev->dev_ptr) {
734                 kthread_stop(dev->process_thread);
735                 if (dev->transport->free_device)
736                         dev->transport->free_device(dev->dev_ptr);
737         }
738
739         spin_lock(&hba->device_lock);
740         list_del(&dev->dev_list);
741         hba->dev_count--;
742         spin_unlock(&hba->device_lock);
743
744         core_scsi3_free_all_registrations(dev);
745         se_release_vpd_for_dev(dev);
746
747         kfree(dev->dev_status_queue_obj);
748         kfree(dev->dev_queue_obj);
749         kfree(dev);
750
751         return;
752 }
753
754 void se_release_vpd_for_dev(struct se_device *dev)
755 {
756         struct t10_vpd *vpd, *vpd_tmp;
757
758         spin_lock(&DEV_T10_WWN(dev)->t10_vpd_lock);
759         list_for_each_entry_safe(vpd, vpd_tmp,
760                         &DEV_T10_WWN(dev)->t10_vpd_list, vpd_list) {
761                 list_del(&vpd->vpd_list);
762                 kfree(vpd);
763         }
764         spin_unlock(&DEV_T10_WWN(dev)->t10_vpd_lock);
765
766         return;
767 }
768
769 /*      se_free_virtual_device():
770  *
771  *      Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
772  */
773 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
774 {
775         if (!list_empty(&dev->dev_sep_list))
776                 dump_stack();
777
778         core_alua_free_lu_gp_mem(dev);
779         se_release_device_for_hba(dev);
780
781         return 0;
782 }
783
784 static void se_dev_start(struct se_device *dev)
785 {
786         struct se_hba *hba = dev->se_hba;
787
788         spin_lock(&hba->device_lock);
789         atomic_inc(&dev->dev_obj.obj_access_count);
790         if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
791                 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
792                         dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
793                         dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
794                 } else if (dev->dev_status &
795                            TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
796                         dev->dev_status &=
797                                 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
798                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
799                 }
800         }
801         spin_unlock(&hba->device_lock);
802 }
803
804 static void se_dev_stop(struct se_device *dev)
805 {
806         struct se_hba *hba = dev->se_hba;
807
808         spin_lock(&hba->device_lock);
809         atomic_dec(&dev->dev_obj.obj_access_count);
810         if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
811                 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
812                         dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
813                         dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
814                 } else if (dev->dev_status &
815                            TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
816                         dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
817                         dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
818                 }
819         }
820         spin_unlock(&hba->device_lock);
821 }
822
823 int se_dev_check_online(struct se_device *dev)
824 {
825         int ret;
826
827         spin_lock_irq(&dev->dev_status_lock);
828         ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
829                (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
830         spin_unlock_irq(&dev->dev_status_lock);
831
832         return ret;
833 }
834
835 int se_dev_check_shutdown(struct se_device *dev)
836 {
837         int ret;
838
839         spin_lock_irq(&dev->dev_status_lock);
840         ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
841         spin_unlock_irq(&dev->dev_status_lock);
842
843         return ret;
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_ATTRIB(dev)->emulate_dpo = DA_EMULATE_DPO;
853         DEV_ATTRIB(dev)->emulate_fua_write = DA_EMULATE_FUA_WRITE;
854         DEV_ATTRIB(dev)->emulate_fua_read = DA_EMULATE_FUA_READ;
855         DEV_ATTRIB(dev)->emulate_write_cache = DA_EMULATE_WRITE_CACHE;
856         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
857         DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
858         DEV_ATTRIB(dev)->emulate_tpu = DA_EMULATE_TPU;
859         DEV_ATTRIB(dev)->emulate_tpws = DA_EMULATE_TPWS;
860         DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
861         DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
862         DEV_ATTRIB(dev)->enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
863         /*
864          * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
865          * iblock_create_virtdevice() from struct queue_limits values
866          * if blk_queue_discard()==1
867          */
868         DEV_ATTRIB(dev)->max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
869         DEV_ATTRIB(dev)->max_unmap_block_desc_count =
870                                 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
871         DEV_ATTRIB(dev)->unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
872         DEV_ATTRIB(dev)->unmap_granularity_alignment =
873                                 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
874         /*
875          * block_size is based on subsystem plugin dependent requirements.
876          */
877         DEV_ATTRIB(dev)->hw_block_size = limits->logical_block_size;
878         DEV_ATTRIB(dev)->block_size = limits->logical_block_size;
879         /*
880          * max_sectors is based on subsystem plugin dependent requirements.
881          */
882         DEV_ATTRIB(dev)->hw_max_sectors = limits->max_hw_sectors;
883         DEV_ATTRIB(dev)->max_sectors = limits->max_sectors;
884         /*
885          * Set optimal_sectors from max_sectors, which can be lowered via
886          * configfs.
887          */
888         DEV_ATTRIB(dev)->optimal_sectors = limits->max_sectors;
889         /*
890          * queue_depth is based on subsystem plugin dependent requirements.
891          */
892         DEV_ATTRIB(dev)->hw_queue_depth = dev_limits->hw_queue_depth;
893         DEV_ATTRIB(dev)->queue_depth = dev_limits->queue_depth;
894 }
895
896 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
897 {
898         if (task_timeout > DA_TASK_TIMEOUT_MAX) {
899                 printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
900                         " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
901                 return -1;
902         } else {
903                 DEV_ATTRIB(dev)->task_timeout = task_timeout;
904                 printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
905                         dev, task_timeout);
906         }
907
908         return 0;
909 }
910
911 int se_dev_set_max_unmap_lba_count(
912         struct se_device *dev,
913         u32 max_unmap_lba_count)
914 {
915         DEV_ATTRIB(dev)->max_unmap_lba_count = max_unmap_lba_count;
916         printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
917                         dev, DEV_ATTRIB(dev)->max_unmap_lba_count);
918         return 0;
919 }
920
921 int se_dev_set_max_unmap_block_desc_count(
922         struct se_device *dev,
923         u32 max_unmap_block_desc_count)
924 {
925         DEV_ATTRIB(dev)->max_unmap_block_desc_count = max_unmap_block_desc_count;
926         printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
927                         dev, DEV_ATTRIB(dev)->max_unmap_block_desc_count);
928         return 0;
929 }
930
931 int se_dev_set_unmap_granularity(
932         struct se_device *dev,
933         u32 unmap_granularity)
934 {
935         DEV_ATTRIB(dev)->unmap_granularity = unmap_granularity;
936         printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
937                         dev, DEV_ATTRIB(dev)->unmap_granularity);
938         return 0;
939 }
940
941 int se_dev_set_unmap_granularity_alignment(
942         struct se_device *dev,
943         u32 unmap_granularity_alignment)
944 {
945         DEV_ATTRIB(dev)->unmap_granularity_alignment = unmap_granularity_alignment;
946         printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
947                         dev, DEV_ATTRIB(dev)->unmap_granularity_alignment);
948         return 0;
949 }
950
951 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
952 {
953         if ((flag != 0) && (flag != 1)) {
954                 printk(KERN_ERR "Illegal value %d\n", flag);
955                 return -1;
956         }
957         if (TRANSPORT(dev)->dpo_emulated == NULL) {
958                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated is NULL\n");
959                 return -1;
960         }
961         if (TRANSPORT(dev)->dpo_emulated(dev) == 0) {
962                 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated not supported\n");
963                 return -1;
964         }
965         DEV_ATTRIB(dev)->emulate_dpo = flag;
966         printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
967                         " bit: %d\n", dev, DEV_ATTRIB(dev)->emulate_dpo);
968         return 0;
969 }
970
971 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
972 {
973         if ((flag != 0) && (flag != 1)) {
974                 printk(KERN_ERR "Illegal value %d\n", flag);
975                 return -1;
976         }
977         if (TRANSPORT(dev)->fua_write_emulated == NULL) {
978                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated is NULL\n");
979                 return -1;
980         }
981         if (TRANSPORT(dev)->fua_write_emulated(dev) == 0) {
982                 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated not supported\n");
983                 return -1;
984         }
985         DEV_ATTRIB(dev)->emulate_fua_write = flag;
986         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
987                         dev, DEV_ATTRIB(dev)->emulate_fua_write);
988         return 0;
989 }
990
991 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
992 {
993         if ((flag != 0) && (flag != 1)) {
994                 printk(KERN_ERR "Illegal value %d\n", flag);
995                 return -1;
996         }
997         if (TRANSPORT(dev)->fua_read_emulated == NULL) {
998                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated is NULL\n");
999                 return -1;
1000         }
1001         if (TRANSPORT(dev)->fua_read_emulated(dev) == 0) {
1002                 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated not supported\n");
1003                 return -1;
1004         }
1005         DEV_ATTRIB(dev)->emulate_fua_read = flag;
1006         printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
1007                         dev, DEV_ATTRIB(dev)->emulate_fua_read);
1008         return 0;
1009 }
1010
1011 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1012 {
1013         if ((flag != 0) && (flag != 1)) {
1014                 printk(KERN_ERR "Illegal value %d\n", flag);
1015                 return -1;
1016         }
1017         if (TRANSPORT(dev)->write_cache_emulated == NULL) {
1018                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated is NULL\n");
1019                 return -1;
1020         }
1021         if (TRANSPORT(dev)->write_cache_emulated(dev) == 0) {
1022                 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated not supported\n");
1023                 return -1;
1024         }
1025         DEV_ATTRIB(dev)->emulate_write_cache = flag;
1026         printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1027                         dev, DEV_ATTRIB(dev)->emulate_write_cache);
1028         return 0;
1029 }
1030
1031 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1032 {
1033         if ((flag != 0) && (flag != 1) && (flag != 2)) {
1034                 printk(KERN_ERR "Illegal value %d\n", flag);
1035                 return -1;
1036         }
1037
1038         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1039                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1040                         " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1041                         " exists\n", dev,
1042                         atomic_read(&dev->dev_export_obj.obj_access_count));
1043                 return -1;
1044         }
1045         DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
1046         printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1047                 dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
1048
1049         return 0;
1050 }
1051
1052 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1053 {
1054         if ((flag != 0) && (flag != 1)) {
1055                 printk(KERN_ERR "Illegal value %d\n", flag);
1056                 return -1;
1057         }
1058
1059         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1060                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
1061                         " dev_export_obj: %d count exists\n", dev,
1062                         atomic_read(&dev->dev_export_obj.obj_access_count));
1063                 return -1;
1064         }
1065         DEV_ATTRIB(dev)->emulate_tas = flag;
1066         printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1067                 dev, (DEV_ATTRIB(dev)->emulate_tas) ? "Enabled" : "Disabled");
1068
1069         return 0;
1070 }
1071
1072 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1073 {
1074         if ((flag != 0) && (flag != 1)) {
1075                 printk(KERN_ERR "Illegal value %d\n", flag);
1076                 return -1;
1077         }
1078         /*
1079          * We expect this value to be non-zero when generic Block Layer
1080          * Discard supported is detected iblock_create_virtdevice().
1081          */
1082         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1083                 printk(KERN_ERR "Generic Block Discard not supported\n");
1084                 return -ENOSYS;
1085         }
1086
1087         DEV_ATTRIB(dev)->emulate_tpu = flag;
1088         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1089                                 dev, flag);
1090         return 0;
1091 }
1092
1093 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1094 {
1095         if ((flag != 0) && (flag != 1)) {
1096                 printk(KERN_ERR "Illegal value %d\n", flag);
1097                 return -1;
1098         }
1099         /*
1100          * We expect this value to be non-zero when generic Block Layer
1101          * Discard supported is detected iblock_create_virtdevice().
1102          */
1103         if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1104                 printk(KERN_ERR "Generic Block Discard not supported\n");
1105                 return -ENOSYS;
1106         }
1107
1108         DEV_ATTRIB(dev)->emulate_tpws = flag;
1109         printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1110                                 dev, flag);
1111         return 0;
1112 }
1113
1114 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1115 {
1116         if ((flag != 0) && (flag != 1)) {
1117                 printk(KERN_ERR "Illegal value %d\n", flag);
1118                 return -1;
1119         }
1120         DEV_ATTRIB(dev)->enforce_pr_isids = flag;
1121         printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1122                 (DEV_ATTRIB(dev)->enforce_pr_isids) ? "Enabled" : "Disabled");
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         u32 orig_queue_depth = dev->queue_depth;
1132
1133         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1134                 printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
1135                         " dev_export_obj: %d count exists\n", dev,
1136                         atomic_read(&dev->dev_export_obj.obj_access_count));
1137                 return -1;
1138         }
1139         if (!(queue_depth)) {
1140                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
1141                         "_depth\n", dev);
1142                 return -1;
1143         }
1144
1145         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1146                 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1147                         printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
1148                                 " exceeds TCM/SE_Device TCQ: %u\n",
1149                                 dev, queue_depth,
1150                                 DEV_ATTRIB(dev)->hw_queue_depth);
1151                         return -1;
1152                 }
1153         } else {
1154                 if (queue_depth > DEV_ATTRIB(dev)->queue_depth) {
1155                         if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1156                                 printk(KERN_ERR "dev[%p]: Passed queue_depth:"
1157                                         " %u exceeds TCM/SE_Device MAX"
1158                                         " TCQ: %u\n", dev, queue_depth,
1159                                         DEV_ATTRIB(dev)->hw_queue_depth);
1160                                 return -1;
1161                         }
1162                 }
1163         }
1164
1165         DEV_ATTRIB(dev)->queue_depth = dev->queue_depth = queue_depth;
1166         if (queue_depth > orig_queue_depth)
1167                 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1168         else if (queue_depth < orig_queue_depth)
1169                 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1170
1171         printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
1172                         dev, queue_depth);
1173         return 0;
1174 }
1175
1176 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1177 {
1178         int force = 0; /* Force setting for VDEVS */
1179
1180         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1181                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1182                         " max_sectors while dev_export_obj: %d count exists\n",
1183                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1184                 return -1;
1185         }
1186         if (!(max_sectors)) {
1187                 printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
1188                         " max_sectors\n", dev);
1189                 return -1;
1190         }
1191         if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1192                 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
1193                         " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1194                                 DA_STATUS_MAX_SECTORS_MIN);
1195                 return -1;
1196         }
1197         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1198                 if (max_sectors > DEV_ATTRIB(dev)->hw_max_sectors) {
1199                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1200                                 " greater than TCM/SE_Device max_sectors:"
1201                                 " %u\n", dev, max_sectors,
1202                                 DEV_ATTRIB(dev)->hw_max_sectors);
1203                          return -1;
1204                 }
1205         } else {
1206                 if (!(force) && (max_sectors >
1207                                  DEV_ATTRIB(dev)->hw_max_sectors)) {
1208                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1209                                 " greater than TCM/SE_Device max_sectors"
1210                                 ": %u, use force=1 to override.\n", dev,
1211                                 max_sectors, DEV_ATTRIB(dev)->hw_max_sectors);
1212                         return -1;
1213                 }
1214                 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1215                         printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1216                                 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1217                                 " %u\n", dev, max_sectors,
1218                                 DA_STATUS_MAX_SECTORS_MAX);
1219                         return -1;
1220                 }
1221         }
1222
1223         DEV_ATTRIB(dev)->max_sectors = max_sectors;
1224         printk("dev[%p]: SE Device max_sectors changed to %u\n",
1225                         dev, max_sectors);
1226         return 0;
1227 }
1228
1229 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1230 {
1231         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1232                 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1233                         " optimal_sectors while dev_export_obj: %d count exists\n",
1234                         dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1235                 return -EINVAL;
1236         }
1237         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1238                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
1239                                 " changed for TCM/pSCSI\n", dev);
1240                 return -EINVAL;
1241         }
1242         if (optimal_sectors > DEV_ATTRIB(dev)->max_sectors) {
1243                 printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
1244                         " greater than max_sectors: %u\n", dev,
1245                         optimal_sectors, DEV_ATTRIB(dev)->max_sectors);
1246                 return -EINVAL;
1247         }
1248
1249         DEV_ATTRIB(dev)->optimal_sectors = optimal_sectors;
1250         printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
1251                         dev, optimal_sectors);
1252         return 0;
1253 }
1254
1255 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1256 {
1257         if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1258                 printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
1259                         " while dev_export_obj: %d count exists\n", dev,
1260                         atomic_read(&dev->dev_export_obj.obj_access_count));
1261                 return -1;
1262         }
1263
1264         if ((block_size != 512) &&
1265             (block_size != 1024) &&
1266             (block_size != 2048) &&
1267             (block_size != 4096)) {
1268                 printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
1269                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1270                         dev, block_size);
1271                 return -1;
1272         }
1273
1274         if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1275                 printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
1276                         " Physical Device, use for Linux/SCSI to change"
1277                         " block_size for underlying hardware\n", dev);
1278                 return -1;
1279         }
1280
1281         DEV_ATTRIB(dev)->block_size = block_size;
1282         printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
1283                         dev, block_size);
1284         return 0;
1285 }
1286
1287 struct se_lun *core_dev_add_lun(
1288         struct se_portal_group *tpg,
1289         struct se_hba *hba,
1290         struct se_device *dev,
1291         u32 lun)
1292 {
1293         struct se_lun *lun_p;
1294         u32 lun_access = 0;
1295
1296         if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1297                 printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
1298                         atomic_read(&dev->dev_access_obj.obj_access_count));
1299                 return NULL;
1300         }
1301
1302         lun_p = core_tpg_pre_addlun(tpg, lun);
1303         if ((IS_ERR(lun_p)) || !(lun_p))
1304                 return NULL;
1305
1306         if (dev->dev_flags & DF_READ_ONLY)
1307                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1308         else
1309                 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1310
1311         if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1312                 return NULL;
1313
1314         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1315                 " CORE HBA: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1316                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun_p->unpacked_lun,
1317                 TPG_TFO(tpg)->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_TFO(tpg)->tpg_check_demo_mode(tpg)) {
1323                 struct se_node_acl *acl;
1324                 spin_lock_bh(&tpg->acl_node_lock);
1325                 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1326                         if (acl->dynamic_node_acl) {
1327                                 spin_unlock_bh(&tpg->acl_node_lock);
1328                                 core_tpg_add_node_to_devs(acl, tpg);
1329                                 spin_lock_bh(&tpg->acl_node_lock);
1330                         }
1331                 }
1332                 spin_unlock_bh(&tpg->acl_node_lock);
1333         }
1334
1335         return lun_p;
1336 }
1337
1338 /*      core_dev_del_lun():
1339  *
1340  *
1341  */
1342 int core_dev_del_lun(
1343         struct se_portal_group *tpg,
1344         u32 unpacked_lun)
1345 {
1346         struct se_lun *lun;
1347         int ret = 0;
1348
1349         lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1350         if (!(lun))
1351                 return ret;
1352
1353         core_tpg_post_dellun(tpg, lun);
1354
1355         printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1356                 " device object\n", TPG_TFO(tpg)->get_fabric_name(),
1357                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun,
1358                 TPG_TFO(tpg)->get_fabric_name());
1359
1360         return 0;
1361 }
1362
1363 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1364 {
1365         struct se_lun *lun;
1366
1367         spin_lock(&tpg->tpg_lun_lock);
1368         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1369                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1370                         "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1371                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1372                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1373                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1374                 spin_unlock(&tpg->tpg_lun_lock);
1375                 return NULL;
1376         }
1377         lun = &tpg->tpg_lun_list[unpacked_lun];
1378
1379         if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1380                 printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
1381                         " Target Portal Group: %hu, ignoring request.\n",
1382                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1383                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1384                 spin_unlock(&tpg->tpg_lun_lock);
1385                 return NULL;
1386         }
1387         spin_unlock(&tpg->tpg_lun_lock);
1388
1389         return lun;
1390 }
1391
1392 /*      core_dev_get_lun():
1393  *
1394  *
1395  */
1396 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1397 {
1398         struct se_lun *lun;
1399
1400         spin_lock(&tpg->tpg_lun_lock);
1401         if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1402                 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1403                         "_TPG-1: %u for Target Portal Group: %hu\n",
1404                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1405                         TRANSPORT_MAX_LUNS_PER_TPG-1,
1406                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1407                 spin_unlock(&tpg->tpg_lun_lock);
1408                 return NULL;
1409         }
1410         lun = &tpg->tpg_lun_list[unpacked_lun];
1411
1412         if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1413                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1414                         " Target Portal Group: %hu, ignoring request.\n",
1415                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1416                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1417                 spin_unlock(&tpg->tpg_lun_lock);
1418                 return NULL;
1419         }
1420         spin_unlock(&tpg->tpg_lun_lock);
1421
1422         return lun;
1423 }
1424
1425 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1426         struct se_portal_group *tpg,
1427         u32 mapped_lun,
1428         char *initiatorname,
1429         int *ret)
1430 {
1431         struct se_lun_acl *lacl;
1432         struct se_node_acl *nacl;
1433
1434         if (strlen(initiatorname) >= TRANSPORT_IQN_LEN) {
1435                 printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
1436                         TPG_TFO(tpg)->get_fabric_name());
1437                 *ret = -EOVERFLOW;
1438                 return NULL;
1439         }
1440         nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1441         if (!(nacl)) {
1442                 *ret = -EINVAL;
1443                 return NULL;
1444         }
1445         lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1446         if (!(lacl)) {
1447                 printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
1448                 *ret = -ENOMEM;
1449                 return NULL;
1450         }
1451
1452         INIT_LIST_HEAD(&lacl->lacl_list);
1453         lacl->mapped_lun = mapped_lun;
1454         lacl->se_lun_nacl = nacl;
1455         snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1456
1457         return lacl;
1458 }
1459
1460 int core_dev_add_initiator_node_lun_acl(
1461         struct se_portal_group *tpg,
1462         struct se_lun_acl *lacl,
1463         u32 unpacked_lun,
1464         u32 lun_access)
1465 {
1466         struct se_lun *lun;
1467         struct se_node_acl *nacl;
1468
1469         lun = core_dev_get_lun(tpg, unpacked_lun);
1470         if (!(lun)) {
1471                 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1472                         " Target Portal Group: %hu, ignoring request.\n",
1473                         TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1474                         TPG_TFO(tpg)->tpg_get_tag(tpg));
1475                 return -EINVAL;
1476         }
1477
1478         nacl = lacl->se_lun_nacl;
1479         if (!(nacl))
1480                 return -EINVAL;
1481
1482         if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1483             (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1484                 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1485
1486         lacl->se_lun = lun;
1487
1488         if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1489                         lun_access, nacl, tpg, 1) < 0)
1490                 return -EINVAL;
1491
1492         spin_lock(&lun->lun_acl_lock);
1493         list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1494         atomic_inc(&lun->lun_acl_count);
1495         smp_mb__after_atomic_inc();
1496         spin_unlock(&lun->lun_acl_lock);
1497
1498         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1499                 " InitiatorNode: %s\n", TPG_TFO(tpg)->get_fabric_name(),
1500                 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1501                 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1502                 lacl->initiatorname);
1503         /*
1504          * Check to see if there are any existing persistent reservation APTPL
1505          * pre-registrations that need to be enabled for this LUN ACL..
1506          */
1507         core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1508         return 0;
1509 }
1510
1511 /*      core_dev_del_initiator_node_lun_acl():
1512  *
1513  *
1514  */
1515 int core_dev_del_initiator_node_lun_acl(
1516         struct se_portal_group *tpg,
1517         struct se_lun *lun,
1518         struct se_lun_acl *lacl)
1519 {
1520         struct se_node_acl *nacl;
1521
1522         nacl = lacl->se_lun_nacl;
1523         if (!(nacl))
1524                 return -EINVAL;
1525
1526         spin_lock(&lun->lun_acl_lock);
1527         list_del(&lacl->lacl_list);
1528         atomic_dec(&lun->lun_acl_count);
1529         smp_mb__after_atomic_dec();
1530         spin_unlock(&lun->lun_acl_lock);
1531
1532         core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1533                 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1534
1535         lacl->se_lun = NULL;
1536
1537         printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1538                 " InitiatorNode: %s Mapped LUN: %u\n",
1539                 TPG_TFO(tpg)->get_fabric_name(),
1540                 TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
1541                 lacl->initiatorname, lacl->mapped_lun);
1542
1543         return 0;
1544 }
1545
1546 void core_dev_free_initiator_node_lun_acl(
1547         struct se_portal_group *tpg,
1548         struct se_lun_acl *lacl)
1549 {
1550         printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1551                 " Mapped LUN: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1552                 TPG_TFO(tpg)->tpg_get_tag(tpg),
1553                 TPG_TFO(tpg)->get_fabric_name(),
1554                 lacl->initiatorname, lacl->mapped_lun);
1555
1556         kfree(lacl);
1557 }
1558
1559 int core_dev_setup_virtual_lun0(void)
1560 {
1561         struct se_hba *hba;
1562         struct se_device *dev;
1563         struct se_subsystem_dev *se_dev = NULL;
1564         struct se_subsystem_api *t;
1565         char buf[16];
1566         int ret;
1567
1568         hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
1569         if (IS_ERR(hba))
1570                 return PTR_ERR(hba);
1571
1572         se_global->g_lun0_hba = hba;
1573         t = hba->transport;
1574
1575         se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1576         if (!(se_dev)) {
1577                 printk(KERN_ERR "Unable to allocate memory for"
1578                                 " struct se_subsystem_dev\n");
1579                 ret = -ENOMEM;
1580                 goto out;
1581         }
1582         INIT_LIST_HEAD(&se_dev->g_se_dev_list);
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_reservation.registration_list);
1586         INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
1587         spin_lock_init(&se_dev->t10_reservation.registration_lock);
1588         spin_lock_init(&se_dev->t10_reservation.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_reservation.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                 printk(KERN_ERR "Unable to locate subsystem dependent pointer"
1601                         " from allocate_virtdevice()\n");
1602                 ret = -ENOMEM;
1603                 goto out;
1604         }
1605         se_global->g_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 (!(dev) || IS_ERR(dev)) {
1613                 ret = -ENOMEM;
1614                 goto out;
1615         }
1616         se_dev->se_dev_ptr = dev;
1617         se_global->g_lun0_dev = dev;
1618
1619         return 0;
1620 out:
1621         se_global->g_lun0_su_dev = NULL;
1622         kfree(se_dev);
1623         if (se_global->g_lun0_hba) {
1624                 core_delete_hba(se_global->g_lun0_hba);
1625                 se_global->g_lun0_hba = NULL;
1626         }
1627         return ret;
1628 }
1629
1630
1631 void core_dev_release_virtual_lun0(void)
1632 {
1633         struct se_hba *hba = se_global->g_lun0_hba;
1634         struct se_subsystem_dev *su_dev = se_global->g_lun0_su_dev;
1635
1636         if (!(hba))
1637                 return;
1638
1639         if (se_global->g_lun0_dev)
1640                 se_free_virtual_device(se_global->g_lun0_dev, hba);
1641
1642         kfree(su_dev);
1643         core_delete_hba(hba);
1644 }