/drivers/target/target_core_device.c
C | 1644 lines | 1267 code | 196 blank | 181 comment | 211 complexity | 7ae5c54d07065c2861ff37725a2bf727 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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
54static void se_dev_start(struct se_device *dev);
55static void se_dev_stop(struct se_device *dev);
56
57int 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 }
96out:
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}
178EXPORT_SYMBOL(transport_get_lun_for_cmd);
179
180int 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}
227EXPORT_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 */
234struct 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
279int 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
318void 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
330void 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 */
355int 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 */
467void 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
499static 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 }
521again:
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
551static 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 */
593static 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
614int 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
633void 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
656int 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 */
708done:
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 */
722void 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
754void 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 */
773int 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
784static 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
804static 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
823int 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
835int 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
846void 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
896int 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
911int 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
921int 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
931int 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
941int 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
951int 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
971int 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
991int 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
1011int 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
1031int 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
1052int 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
1072int 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
1093int 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
1114int 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 */
1129int 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
1176int 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
1229int 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
1255int 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
1287struct 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 */
1342int 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
1363struct 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 */
1396static 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
1425struct 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
1460int 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 */
1515int 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
1546void 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
1559int 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;
1620out:
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
1631void 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}