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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux...
[deliverable/linux.git] / drivers / target / target_core_device.c
1 /*******************************************************************************
2 * Filename: target_core_device.c (based on iscsi_target_device.c)
3 *
4 * This file contains the iSCSI Virtual Device and Disk Transport
5 * agnostic related functions.
6 *
7 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
8 * Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved.
9 * Copyright (c) 2007-2010 Rising Tide Systems
10 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 *
12 * Nicholas A. Bellinger <nab@kernel.org>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 *
28 ******************************************************************************/
29
30 #include <linux/net.h>
31 #include <linux/string.h>
32 #include <linux/delay.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
37 #include <linux/in.h>
38 #include <net/sock.h>
39 #include <net/tcp.h>
40 #include <scsi/scsi.h>
41
42 #include <target/target_core_base.h>
43 #include <target/target_core_device.h>
44 #include <target/target_core_tpg.h>
45 #include <target/target_core_transport.h>
46 #include <target/target_core_fabric_ops.h>
47
48 #include "target_core_alua.h"
49 #include "target_core_hba.h"
50 #include "target_core_pr.h"
51 #include "target_core_ua.h"
52
53 static void se_dev_start(struct se_device *dev);
54 static void se_dev_stop(struct se_device *dev);
55
56 int transport_get_lun_for_cmd(
57 struct se_cmd *se_cmd,
58 unsigned char *cdb,
59 u32 unpacked_lun)
60 {
61 struct se_dev_entry *deve;
62 struct se_lun *se_lun = NULL;
63 struct se_session *se_sess = SE_SESS(se_cmd);
64 unsigned long flags;
65 int read_only = 0;
66
67 spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
68 deve = se_cmd->se_deve =
69 &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
70 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
71 if (se_cmd) {
72 deve->total_cmds++;
73 deve->total_bytes += se_cmd->data_length;
74
75 if (se_cmd->data_direction == DMA_TO_DEVICE) {
76 if (deve->lun_flags &
77 TRANSPORT_LUNFLAGS_READ_ONLY) {
78 read_only = 1;
79 goto out;
80 }
81 deve->write_bytes += se_cmd->data_length;
82 } else if (se_cmd->data_direction ==
83 DMA_FROM_DEVICE) {
84 deve->read_bytes += se_cmd->data_length;
85 }
86 }
87 deve->deve_cmds++;
88
89 se_lun = se_cmd->se_lun = deve->se_lun;
90 se_cmd->pr_res_key = deve->pr_res_key;
91 se_cmd->orig_fe_lun = unpacked_lun;
92 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
93 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
94 }
95 out:
96 spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
97
98 if (!se_lun) {
99 if (read_only) {
100 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
101 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
102 printk("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
103 " Access for 0x%08x\n",
104 CMD_TFO(se_cmd)->get_fabric_name(),
105 unpacked_lun);
106 return -1;
107 } else {
108 /*
109 * Use the se_portal_group->tpg_virt_lun0 to allow for
110 * REPORT_LUNS, et al to be returned when no active
111 * MappedLUN=0 exists for this Initiator Port.
112 */
113 if (unpacked_lun != 0) {
114 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
115 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
116 printk("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
117 " Access for 0x%08x\n",
118 CMD_TFO(se_cmd)->get_fabric_name(),
119 unpacked_lun);
120 return -1;
121 }
122 /*
123 * Force WRITE PROTECT for virtual LUN 0
124 */
125 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
126 (se_cmd->data_direction != DMA_NONE)) {
127 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
128 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
129 return -1;
130 }
131 #if 0
132 printk("TARGET_CORE[%s]: Using virtual LUN0! :-)\n",
133 CMD_TFO(se_cmd)->get_fabric_name());
134 #endif
135 se_lun = se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
136 se_cmd->orig_fe_lun = 0;
137 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
138 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
139 }
140 }
141 /*
142 * Determine if the struct se_lun is online.
143 */
144 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
145 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
146 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
147 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
148 return -1;
149 }
150
151 {
152 struct se_device *dev = se_lun->lun_se_dev;
153 spin_lock(&dev->stats_lock);
154 dev->num_cmds++;
155 if (se_cmd->data_direction == DMA_TO_DEVICE)
156 dev->write_bytes += se_cmd->data_length;
157 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
158 dev->read_bytes += se_cmd->data_length;
159 spin_unlock(&dev->stats_lock);
160 }
161
162 /*
163 * Add the iscsi_cmd_t to the struct se_lun's cmd list. This list is used
164 * for tracking state of struct se_cmds during LUN shutdown events.
165 */
166 spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
167 list_add_tail(&se_cmd->se_lun_list, &se_lun->lun_cmd_list);
168 atomic_set(&T_TASK(se_cmd)->transport_lun_active, 1);
169 #if 0
170 printk(KERN_INFO "Adding ITT: 0x%08x to LUN LIST[%d]\n",
171 CMD_TFO(se_cmd)->get_task_tag(se_cmd), se_lun->unpacked_lun);
172 #endif
173 spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
174
175 return 0;
176 }
177 EXPORT_SYMBOL(transport_get_lun_for_cmd);
178
179 int transport_get_lun_for_tmr(
180 struct se_cmd *se_cmd,
181 u32 unpacked_lun)
182 {
183 struct se_device *dev = NULL;
184 struct se_dev_entry *deve;
185 struct se_lun *se_lun = NULL;
186 struct se_session *se_sess = SE_SESS(se_cmd);
187 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
188
189 spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
190 deve = se_cmd->se_deve =
191 &SE_NODE_ACL(se_sess)->device_list[unpacked_lun];
192 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
193 se_lun = se_cmd->se_lun = se_tmr->tmr_lun = deve->se_lun;
194 dev = se_tmr->tmr_dev = se_lun->lun_se_dev;
195 se_cmd->pr_res_key = deve->pr_res_key;
196 se_cmd->orig_fe_lun = unpacked_lun;
197 se_cmd->se_orig_obj_ptr = SE_LUN(se_cmd)->lun_se_dev;
198 /* se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD; */
199 }
200 spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
201
202 if (!se_lun) {
203 printk(KERN_INFO "TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
204 " Access for 0x%08x\n",
205 CMD_TFO(se_cmd)->get_fabric_name(),
206 unpacked_lun);
207 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
208 return -1;
209 }
210 /*
211 * Determine if the struct se_lun is online.
212 */
213 /* #warning FIXME: Check for LUN_RESET + UNIT Attention */
214 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
215 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
216 return -1;
217 }
218
219 spin_lock(&dev->se_tmr_lock);
220 list_add_tail(&se_tmr->tmr_list, &dev->dev_tmr_list);
221 spin_unlock(&dev->se_tmr_lock);
222
223 return 0;
224 }
225 EXPORT_SYMBOL(transport_get_lun_for_tmr);
226
227 /*
228 * This function is called from core_scsi3_emulate_pro_register_and_move()
229 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
230 * when a matching rtpi is found.
231 */
232 struct se_dev_entry *core_get_se_deve_from_rtpi(
233 struct se_node_acl *nacl,
234 u16 rtpi)
235 {
236 struct se_dev_entry *deve;
237 struct se_lun *lun;
238 struct se_port *port;
239 struct se_portal_group *tpg = nacl->se_tpg;
240 u32 i;
241
242 spin_lock_irq(&nacl->device_list_lock);
243 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
244 deve = &nacl->device_list[i];
245
246 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
247 continue;
248
249 lun = deve->se_lun;
250 if (!(lun)) {
251 printk(KERN_ERR "%s device entries device pointer is"
252 " NULL, but Initiator has access.\n",
253 TPG_TFO(tpg)->get_fabric_name());
254 continue;
255 }
256 port = lun->lun_sep;
257 if (!(port)) {
258 printk(KERN_ERR "%s device entries device pointer is"
259 " NULL, but Initiator has access.\n",
260 TPG_TFO(tpg)->get_fabric_name());
261 continue;
262 }
263 if (port->sep_rtpi != rtpi)
264 continue;
265
266 atomic_inc(&deve->pr_ref_count);
267 smp_mb__after_atomic_inc();
268 spin_unlock_irq(&nacl->device_list_lock);
269
270 return deve;
271 }
272 spin_unlock_irq(&nacl->device_list_lock);
273
274 return NULL;
275 }
276
277 int core_free_device_list_for_node(
278 struct se_node_acl *nacl,
279 struct se_portal_group *tpg)
280 {
281 struct se_dev_entry *deve;
282 struct se_lun *lun;
283 u32 i;
284
285 if (!nacl->device_list)
286 return 0;
287
288 spin_lock_irq(&nacl->device_list_lock);
289 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
290 deve = &nacl->device_list[i];
291
292 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
293 continue;
294
295 if (!deve->se_lun) {
296 printk(KERN_ERR "%s device entries device pointer is"
297 " NULL, but Initiator has access.\n",
298 TPG_TFO(tpg)->get_fabric_name());
299 continue;
300 }
301 lun = deve->se_lun;
302
303 spin_unlock_irq(&nacl->device_list_lock);
304 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
305 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
306 spin_lock_irq(&nacl->device_list_lock);
307 }
308 spin_unlock_irq(&nacl->device_list_lock);
309
310 kfree(nacl->device_list);
311 nacl->device_list = NULL;
312
313 return 0;
314 }
315
316 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
317 {
318 struct se_dev_entry *deve;
319
320 spin_lock_irq(&se_nacl->device_list_lock);
321 deve = &se_nacl->device_list[se_cmd->orig_fe_lun];
322 deve->deve_cmds--;
323 spin_unlock_irq(&se_nacl->device_list_lock);
324
325 return;
326 }
327
328 void core_update_device_list_access(
329 u32 mapped_lun,
330 u32 lun_access,
331 struct se_node_acl *nacl)
332 {
333 struct se_dev_entry *deve;
334
335 spin_lock_irq(&nacl->device_list_lock);
336 deve = &nacl->device_list[mapped_lun];
337 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
338 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
339 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
340 } else {
341 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
342 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
343 }
344 spin_unlock_irq(&nacl->device_list_lock);
345
346 return;
347 }
348
349 /* core_update_device_list_for_node():
350 *
351 *
352 */
353 int core_update_device_list_for_node(
354 struct se_lun *lun,
355 struct se_lun_acl *lun_acl,
356 u32 mapped_lun,
357 u32 lun_access,
358 struct se_node_acl *nacl,
359 struct se_portal_group *tpg,
360 int enable)
361 {
362 struct se_port *port = lun->lun_sep;
363 struct se_dev_entry *deve = &nacl->device_list[mapped_lun];
364 int trans = 0;
365 /*
366 * If the MappedLUN entry is being disabled, the entry in
367 * port->sep_alua_list must be removed now before clearing the
368 * struct se_dev_entry pointers below as logic in
369 * core_alua_do_transition_tg_pt() depends on these being present.
370 */
371 if (!(enable)) {
372 /*
373 * deve->se_lun_acl will be NULL for demo-mode created LUNs
374 * that have not been explictly concerted to MappedLUNs ->
375 * struct se_lun_acl, but we remove deve->alua_port_list from
376 * port->sep_alua_list. This also means that active UAs and
377 * NodeACL context specific PR metadata for demo-mode
378 * MappedLUN *deve will be released below..
379 */
380 spin_lock_bh(&port->sep_alua_lock);
381 list_del(&deve->alua_port_list);
382 spin_unlock_bh(&port->sep_alua_lock);
383 }
384
385 spin_lock_irq(&nacl->device_list_lock);
386 if (enable) {
387 /*
388 * Check if the call is handling demo mode -> explict LUN ACL
389 * transition. This transition must be for the same struct se_lun
390 * + mapped_lun that was setup in demo mode..
391 */
392 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
393 if (deve->se_lun_acl != NULL) {
394 printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
395 " already set for demo mode -> explict"
396 " LUN ACL transition\n");
397 spin_unlock_irq(&nacl->device_list_lock);
398 return -1;
399 }
400 if (deve->se_lun != lun) {
401 printk(KERN_ERR "struct se_dev_entry->se_lun does"
402 " match passed struct se_lun for demo mode"
403 " -> explict LUN ACL transition\n");
404 spin_unlock_irq(&nacl->device_list_lock);
405 return -1;
406 }
407 deve->se_lun_acl = lun_acl;
408 trans = 1;
409 } else {
410 deve->se_lun = lun;
411 deve->se_lun_acl = lun_acl;
412 deve->mapped_lun = mapped_lun;
413 deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
414 }
415
416 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
417 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
418 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
419 } else {
420 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
421 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
422 }
423
424 if (trans) {
425 spin_unlock_irq(&nacl->device_list_lock);
426 return 0;
427 }
428 deve->creation_time = get_jiffies_64();
429 deve->attach_count++;
430 spin_unlock_irq(&nacl->device_list_lock);
431
432 spin_lock_bh(&port->sep_alua_lock);
433 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
434 spin_unlock_bh(&port->sep_alua_lock);
435
436 return 0;
437 }
438 /*
439 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
440 * PR operation to complete.
441 */
442 spin_unlock_irq(&nacl->device_list_lock);
443 while (atomic_read(&deve->pr_ref_count) != 0)
444 cpu_relax();
445 spin_lock_irq(&nacl->device_list_lock);
446 /*
447 * Disable struct se_dev_entry LUN ACL mapping
448 */
449 core_scsi3_ua_release_all(deve);
450 deve->se_lun = NULL;
451 deve->se_lun_acl = NULL;
452 deve->lun_flags = 0;
453 deve->creation_time = 0;
454 deve->attach_count--;
455 spin_unlock_irq(&nacl->device_list_lock);
456
457 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
458 return 0;
459 }
460
461 /* core_clear_lun_from_tpg():
462 *
463 *
464 */
465 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
466 {
467 struct se_node_acl *nacl;
468 struct se_dev_entry *deve;
469 u32 i;
470
471 spin_lock_bh(&tpg->acl_node_lock);
472 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
473 spin_unlock_bh(&tpg->acl_node_lock);
474
475 spin_lock_irq(&nacl->device_list_lock);
476 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
477 deve = &nacl->device_list[i];
478 if (lun != deve->se_lun)
479 continue;
480 spin_unlock_irq(&nacl->device_list_lock);
481
482 core_update_device_list_for_node(lun, NULL,
483 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
484 nacl, tpg, 0);
485
486 spin_lock_irq(&nacl->device_list_lock);
487 }
488 spin_unlock_irq(&nacl->device_list_lock);
489
490 spin_lock_bh(&tpg->acl_node_lock);
491 }
492 spin_unlock_bh(&tpg->acl_node_lock);
493
494 return;
495 }
496
497 static struct se_port *core_alloc_port(struct se_device *dev)
498 {
499 struct se_port *port, *port_tmp;
500
501 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
502 if (!(port)) {
503 printk(KERN_ERR "Unable to allocate struct se_port\n");
504 return NULL;
505 }
506 INIT_LIST_HEAD(&port->sep_alua_list);
507 INIT_LIST_HEAD(&port->sep_list);
508 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
509 spin_lock_init(&port->sep_alua_lock);
510 mutex_init(&port->sep_tg_pt_md_mutex);
511
512 spin_lock(&dev->se_port_lock);
513 if (dev->dev_port_count == 0x0000ffff) {
514 printk(KERN_WARNING "Reached dev->dev_port_count =="
515 " 0x0000ffff\n");
516 spin_unlock(&dev->se_port_lock);
517 return NULL;
518 }
519 again:
520 /*
521 * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
522 * Here is the table from spc4r17 section 7.7.3.8.
523 *
524 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
525 *
526 * Code Description
527 * 0h Reserved
528 * 1h Relative port 1, historically known as port A
529 * 2h Relative port 2, historically known as port B
530 * 3h to FFFFh Relative port 3 through 65 535
531 */
532 port->sep_rtpi = dev->dev_rpti_counter++;
533 if (!(port->sep_rtpi))
534 goto again;
535
536 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
537 /*
538 * Make sure RELATIVE TARGET PORT IDENTIFER is unique
539 * for 16-bit wrap..
540 */
541 if (port->sep_rtpi == port_tmp->sep_rtpi)
542 goto again;
543 }
544 spin_unlock(&dev->se_port_lock);
545
546 return port;
547 }
548
549 static void core_export_port(
550 struct se_device *dev,
551 struct se_portal_group *tpg,
552 struct se_port *port,
553 struct se_lun *lun)
554 {
555 struct se_subsystem_dev *su_dev = SU_DEV(dev);
556 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
557
558 spin_lock(&dev->se_port_lock);
559 spin_lock(&lun->lun_sep_lock);
560 port->sep_tpg = tpg;
561 port->sep_lun = lun;
562 lun->lun_sep = port;
563 spin_unlock(&lun->lun_sep_lock);
564
565 list_add_tail(&port->sep_list, &dev->dev_sep_list);
566 spin_unlock(&dev->se_port_lock);
567
568 if (T10_ALUA(su_dev)->alua_type == SPC3_ALUA_EMULATED) {
569 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
570 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
571 printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
572 "_gp_member_t\n");
573 return;
574 }
575 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
576 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
577 T10_ALUA(su_dev)->default_tg_pt_gp);
578 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
579 printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
580 " Group: alua/default_tg_pt_gp\n",
581 TRANSPORT(dev)->name, TPG_TFO(tpg)->get_fabric_name());
582 }
583
584 dev->dev_port_count++;
585 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
586 }
587
588 /*
589 * Called with struct se_device->se_port_lock spinlock held.
590 */
591 static void core_release_port(struct se_device *dev, struct se_port *port)
592 {
593 /*
594 * Wait for any port reference for PR ALL_TG_PT=1 operation
595 * to complete in __core_scsi3_alloc_registration()
596 */
597 spin_unlock(&dev->se_port_lock);
598 if (atomic_read(&port->sep_tg_pt_ref_cnt))
599 cpu_relax();
600 spin_lock(&dev->se_port_lock);
601
602 core_alua_free_tg_pt_gp_mem(port);
603
604 list_del(&port->sep_list);
605 dev->dev_port_count--;
606 kfree(port);
607
608 return;
609 }
610
611 int core_dev_export(
612 struct se_device *dev,
613 struct se_portal_group *tpg,
614 struct se_lun *lun)
615 {
616 struct se_port *port;
617
618 port = core_alloc_port(dev);
619 if (!(port))
620 return -1;
621
622 lun->lun_se_dev = dev;
623 se_dev_start(dev);
624
625 atomic_inc(&dev->dev_export_obj.obj_access_count);
626 core_export_port(dev, tpg, port, lun);
627 return 0;
628 }
629
630 void core_dev_unexport(
631 struct se_device *dev,
632 struct se_portal_group *tpg,
633 struct se_lun *lun)
634 {
635 struct se_port *port = lun->lun_sep;
636
637 spin_lock(&lun->lun_sep_lock);
638 if (lun->lun_se_dev == NULL) {
639 spin_unlock(&lun->lun_sep_lock);
640 return;
641 }
642 spin_unlock(&lun->lun_sep_lock);
643
644 spin_lock(&dev->se_port_lock);
645 atomic_dec(&dev->dev_export_obj.obj_access_count);
646 core_release_port(dev, port);
647 spin_unlock(&dev->se_port_lock);
648
649 se_dev_stop(dev);
650 lun->lun_se_dev = NULL;
651 }
652
653 int transport_core_report_lun_response(struct se_cmd *se_cmd)
654 {
655 struct se_dev_entry *deve;
656 struct se_lun *se_lun;
657 struct se_session *se_sess = SE_SESS(se_cmd);
658 struct se_task *se_task;
659 unsigned char *buf = (unsigned char *)T_TASK(se_cmd)->t_task_buf;
660 u32 cdb_offset = 0, lun_count = 0, offset = 8;
661 u64 i, lun;
662
663 list_for_each_entry(se_task, &T_TASK(se_cmd)->t_task_list, t_list)
664 break;
665
666 if (!(se_task)) {
667 printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
668 return PYX_TRANSPORT_LU_COMM_FAILURE;
669 }
670
671 /*
672 * If no struct se_session pointer is present, this struct se_cmd is
673 * coming via a target_core_mod PASSTHROUGH op, and not through
674 * a $FABRIC_MOD. In that case, report LUN=0 only.
675 */
676 if (!(se_sess)) {
677 lun = 0;
678 buf[offset++] = ((lun >> 56) & 0xff);
679 buf[offset++] = ((lun >> 48) & 0xff);
680 buf[offset++] = ((lun >> 40) & 0xff);
681 buf[offset++] = ((lun >> 32) & 0xff);
682 buf[offset++] = ((lun >> 24) & 0xff);
683 buf[offset++] = ((lun >> 16) & 0xff);
684 buf[offset++] = ((lun >> 8) & 0xff);
685 buf[offset++] = (lun & 0xff);
686 lun_count = 1;
687 goto done;
688 }
689
690 spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
691 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
692 deve = &SE_NODE_ACL(se_sess)->device_list[i];
693 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
694 continue;
695 se_lun = deve->se_lun;
696 /*
697 * We determine the correct LUN LIST LENGTH even once we
698 * have reached the initial allocation length.
699 * See SPC2-R20 7.19.
700 */
701 lun_count++;
702 if ((cdb_offset + 8) >= se_cmd->data_length)
703 continue;
704
705 lun = cpu_to_be64(CMD_TFO(se_cmd)->pack_lun(deve->mapped_lun));
706 buf[offset++] = ((lun >> 56) & 0xff);
707 buf[offset++] = ((lun >> 48) & 0xff);
708 buf[offset++] = ((lun >> 40) & 0xff);
709 buf[offset++] = ((lun >> 32) & 0xff);
710 buf[offset++] = ((lun >> 24) & 0xff);
711 buf[offset++] = ((lun >> 16) & 0xff);
712 buf[offset++] = ((lun >> 8) & 0xff);
713 buf[offset++] = (lun & 0xff);
714 cdb_offset += 8;
715 }
716 spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
717
718 /*
719 * See SPC3 r07, page 159.
720 */
721 done:
722 lun_count *= 8;
723 buf[0] = ((lun_count >> 24) & 0xff);
724 buf[1] = ((lun_count >> 16) & 0xff);
725 buf[2] = ((lun_count >> 8) & 0xff);
726 buf[3] = (lun_count & 0xff);
727
728 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
729 }
730
731 /* se_release_device_for_hba():
732 *
733 *
734 */
735 void se_release_device_for_hba(struct se_device *dev)
736 {
737 struct se_hba *hba = dev->se_hba;
738
739 if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
740 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
741 (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
742 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
743 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
744 se_dev_stop(dev);
745
746 if (dev->dev_ptr) {
747 kthread_stop(dev->process_thread);
748 if (dev->transport->free_device)
749 dev->transport->free_device(dev->dev_ptr);
750 }
751
752 spin_lock(&hba->device_lock);
753 list_del(&dev->dev_list);
754 hba->dev_count--;
755 spin_unlock(&hba->device_lock);
756
757 core_scsi3_free_all_registrations(dev);
758 se_release_vpd_for_dev(dev);
759
760 kfree(dev->dev_status_queue_obj);
761 kfree(dev->dev_queue_obj);
762 kfree(dev);
763
764 return;
765 }
766
767 void se_release_vpd_for_dev(struct se_device *dev)
768 {
769 struct t10_vpd *vpd, *vpd_tmp;
770
771 spin_lock(&DEV_T10_WWN(dev)->t10_vpd_lock);
772 list_for_each_entry_safe(vpd, vpd_tmp,
773 &DEV_T10_WWN(dev)->t10_vpd_list, vpd_list) {
774 list_del(&vpd->vpd_list);
775 kfree(vpd);
776 }
777 spin_unlock(&DEV_T10_WWN(dev)->t10_vpd_lock);
778
779 return;
780 }
781
782 /*
783 * Called with struct se_hba->device_lock held.
784 */
785 void se_clear_dev_ports(struct se_device *dev)
786 {
787 struct se_hba *hba = dev->se_hba;
788 struct se_lun *lun;
789 struct se_portal_group *tpg;
790 struct se_port *sep, *sep_tmp;
791
792 spin_lock(&dev->se_port_lock);
793 list_for_each_entry_safe(sep, sep_tmp, &dev->dev_sep_list, sep_list) {
794 spin_unlock(&dev->se_port_lock);
795 spin_unlock(&hba->device_lock);
796
797 lun = sep->sep_lun;
798 tpg = sep->sep_tpg;
799 spin_lock(&lun->lun_sep_lock);
800 if (lun->lun_se_dev == NULL) {
801 spin_unlock(&lun->lun_sep_lock);
802 continue;
803 }
804 spin_unlock(&lun->lun_sep_lock);
805
806 core_dev_del_lun(tpg, lun->unpacked_lun);
807
808 spin_lock(&hba->device_lock);
809 spin_lock(&dev->se_port_lock);
810 }
811 spin_unlock(&dev->se_port_lock);
812
813 return;
814 }
815
816 /* se_free_virtual_device():
817 *
818 * Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
819 */
820 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
821 {
822 spin_lock(&hba->device_lock);
823 se_clear_dev_ports(dev);
824 spin_unlock(&hba->device_lock);
825
826 core_alua_free_lu_gp_mem(dev);
827 se_release_device_for_hba(dev);
828
829 return 0;
830 }
831
832 static void se_dev_start(struct se_device *dev)
833 {
834 struct se_hba *hba = dev->se_hba;
835
836 spin_lock(&hba->device_lock);
837 atomic_inc(&dev->dev_obj.obj_access_count);
838 if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
839 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
840 dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
841 dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
842 } else if (dev->dev_status &
843 TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
844 dev->dev_status &=
845 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
846 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
847 }
848 }
849 spin_unlock(&hba->device_lock);
850 }
851
852 static void se_dev_stop(struct se_device *dev)
853 {
854 struct se_hba *hba = dev->se_hba;
855
856 spin_lock(&hba->device_lock);
857 atomic_dec(&dev->dev_obj.obj_access_count);
858 if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
859 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
860 dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
861 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
862 } else if (dev->dev_status &
863 TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
864 dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
865 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
866 }
867 }
868 spin_unlock(&hba->device_lock);
869 }
870
871 int se_dev_check_online(struct se_device *dev)
872 {
873 int ret;
874
875 spin_lock_irq(&dev->dev_status_lock);
876 ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
877 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
878 spin_unlock_irq(&dev->dev_status_lock);
879
880 return ret;
881 }
882
883 int se_dev_check_shutdown(struct se_device *dev)
884 {
885 int ret;
886
887 spin_lock_irq(&dev->dev_status_lock);
888 ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
889 spin_unlock_irq(&dev->dev_status_lock);
890
891 return ret;
892 }
893
894 void se_dev_set_default_attribs(
895 struct se_device *dev,
896 struct se_dev_limits *dev_limits)
897 {
898 struct queue_limits *limits = &dev_limits->limits;
899
900 DEV_ATTRIB(dev)->emulate_dpo = DA_EMULATE_DPO;
901 DEV_ATTRIB(dev)->emulate_fua_write = DA_EMULATE_FUA_WRITE;
902 DEV_ATTRIB(dev)->emulate_fua_read = DA_EMULATE_FUA_READ;
903 DEV_ATTRIB(dev)->emulate_write_cache = DA_EMULATE_WRITE_CACHE;
904 DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
905 DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
906 DEV_ATTRIB(dev)->emulate_tpu = DA_EMULATE_TPU;
907 DEV_ATTRIB(dev)->emulate_tpws = DA_EMULATE_TPWS;
908 DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
909 DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
910 DEV_ATTRIB(dev)->enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
911 /*
912 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
913 * iblock_create_virtdevice() from struct queue_limits values
914 * if blk_queue_discard()==1
915 */
916 DEV_ATTRIB(dev)->max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
917 DEV_ATTRIB(dev)->max_unmap_block_desc_count =
918 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
919 DEV_ATTRIB(dev)->unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
920 DEV_ATTRIB(dev)->unmap_granularity_alignment =
921 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
922 /*
923 * block_size is based on subsystem plugin dependent requirements.
924 */
925 DEV_ATTRIB(dev)->hw_block_size = limits->logical_block_size;
926 DEV_ATTRIB(dev)->block_size = limits->logical_block_size;
927 /*
928 * max_sectors is based on subsystem plugin dependent requirements.
929 */
930 DEV_ATTRIB(dev)->hw_max_sectors = limits->max_hw_sectors;
931 DEV_ATTRIB(dev)->max_sectors = limits->max_sectors;
932 /*
933 * Set optimal_sectors from max_sectors, which can be lowered via
934 * configfs.
935 */
936 DEV_ATTRIB(dev)->optimal_sectors = limits->max_sectors;
937 /*
938 * queue_depth is based on subsystem plugin dependent requirements.
939 */
940 DEV_ATTRIB(dev)->hw_queue_depth = dev_limits->hw_queue_depth;
941 DEV_ATTRIB(dev)->queue_depth = dev_limits->queue_depth;
942 }
943
944 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
945 {
946 if (task_timeout > DA_TASK_TIMEOUT_MAX) {
947 printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
948 " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
949 return -1;
950 } else {
951 DEV_ATTRIB(dev)->task_timeout = task_timeout;
952 printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
953 dev, task_timeout);
954 }
955
956 return 0;
957 }
958
959 int se_dev_set_max_unmap_lba_count(
960 struct se_device *dev,
961 u32 max_unmap_lba_count)
962 {
963 DEV_ATTRIB(dev)->max_unmap_lba_count = max_unmap_lba_count;
964 printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
965 dev, DEV_ATTRIB(dev)->max_unmap_lba_count);
966 return 0;
967 }
968
969 int se_dev_set_max_unmap_block_desc_count(
970 struct se_device *dev,
971 u32 max_unmap_block_desc_count)
972 {
973 DEV_ATTRIB(dev)->max_unmap_block_desc_count = max_unmap_block_desc_count;
974 printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
975 dev, DEV_ATTRIB(dev)->max_unmap_block_desc_count);
976 return 0;
977 }
978
979 int se_dev_set_unmap_granularity(
980 struct se_device *dev,
981 u32 unmap_granularity)
982 {
983 DEV_ATTRIB(dev)->unmap_granularity = unmap_granularity;
984 printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
985 dev, DEV_ATTRIB(dev)->unmap_granularity);
986 return 0;
987 }
988
989 int se_dev_set_unmap_granularity_alignment(
990 struct se_device *dev,
991 u32 unmap_granularity_alignment)
992 {
993 DEV_ATTRIB(dev)->unmap_granularity_alignment = unmap_granularity_alignment;
994 printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
995 dev, DEV_ATTRIB(dev)->unmap_granularity_alignment);
996 return 0;
997 }
998
999 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
1000 {
1001 if ((flag != 0) && (flag != 1)) {
1002 printk(KERN_ERR "Illegal value %d\n", flag);
1003 return -1;
1004 }
1005 if (TRANSPORT(dev)->dpo_emulated == NULL) {
1006 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated is NULL\n");
1007 return -1;
1008 }
1009 if (TRANSPORT(dev)->dpo_emulated(dev) == 0) {
1010 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated not supported\n");
1011 return -1;
1012 }
1013 DEV_ATTRIB(dev)->emulate_dpo = flag;
1014 printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
1015 " bit: %d\n", dev, DEV_ATTRIB(dev)->emulate_dpo);
1016 return 0;
1017 }
1018
1019 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
1020 {
1021 if ((flag != 0) && (flag != 1)) {
1022 printk(KERN_ERR "Illegal value %d\n", flag);
1023 return -1;
1024 }
1025 if (TRANSPORT(dev)->fua_write_emulated == NULL) {
1026 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated is NULL\n");
1027 return -1;
1028 }
1029 if (TRANSPORT(dev)->fua_write_emulated(dev) == 0) {
1030 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated not supported\n");
1031 return -1;
1032 }
1033 DEV_ATTRIB(dev)->emulate_fua_write = flag;
1034 printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
1035 dev, DEV_ATTRIB(dev)->emulate_fua_write);
1036 return 0;
1037 }
1038
1039 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
1040 {
1041 if ((flag != 0) && (flag != 1)) {
1042 printk(KERN_ERR "Illegal value %d\n", flag);
1043 return -1;
1044 }
1045 if (TRANSPORT(dev)->fua_read_emulated == NULL) {
1046 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated is NULL\n");
1047 return -1;
1048 }
1049 if (TRANSPORT(dev)->fua_read_emulated(dev) == 0) {
1050 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated not supported\n");
1051 return -1;
1052 }
1053 DEV_ATTRIB(dev)->emulate_fua_read = flag;
1054 printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
1055 dev, DEV_ATTRIB(dev)->emulate_fua_read);
1056 return 0;
1057 }
1058
1059 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1060 {
1061 if ((flag != 0) && (flag != 1)) {
1062 printk(KERN_ERR "Illegal value %d\n", flag);
1063 return -1;
1064 }
1065 if (TRANSPORT(dev)->write_cache_emulated == NULL) {
1066 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated is NULL\n");
1067 return -1;
1068 }
1069 if (TRANSPORT(dev)->write_cache_emulated(dev) == 0) {
1070 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated not supported\n");
1071 return -1;
1072 }
1073 DEV_ATTRIB(dev)->emulate_write_cache = flag;
1074 printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1075 dev, DEV_ATTRIB(dev)->emulate_write_cache);
1076 return 0;
1077 }
1078
1079 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1080 {
1081 if ((flag != 0) && (flag != 1) && (flag != 2)) {
1082 printk(KERN_ERR "Illegal value %d\n", flag);
1083 return -1;
1084 }
1085
1086 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1087 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1088 " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1089 " exists\n", dev,
1090 atomic_read(&dev->dev_export_obj.obj_access_count));
1091 return -1;
1092 }
1093 DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
1094 printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1095 dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
1096
1097 return 0;
1098 }
1099
1100 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1101 {
1102 if ((flag != 0) && (flag != 1)) {
1103 printk(KERN_ERR "Illegal value %d\n", flag);
1104 return -1;
1105 }
1106
1107 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1108 printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
1109 " dev_export_obj: %d count exists\n", dev,
1110 atomic_read(&dev->dev_export_obj.obj_access_count));
1111 return -1;
1112 }
1113 DEV_ATTRIB(dev)->emulate_tas = flag;
1114 printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1115 dev, (DEV_ATTRIB(dev)->emulate_tas) ? "Enabled" : "Disabled");
1116
1117 return 0;
1118 }
1119
1120 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1121 {
1122 if ((flag != 0) && (flag != 1)) {
1123 printk(KERN_ERR "Illegal value %d\n", flag);
1124 return -1;
1125 }
1126 /*
1127 * We expect this value to be non-zero when generic Block Layer
1128 * Discard supported is detected iblock_create_virtdevice().
1129 */
1130 if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1131 printk(KERN_ERR "Generic Block Discard not supported\n");
1132 return -ENOSYS;
1133 }
1134
1135 DEV_ATTRIB(dev)->emulate_tpu = flag;
1136 printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1137 dev, flag);
1138 return 0;
1139 }
1140
1141 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1142 {
1143 if ((flag != 0) && (flag != 1)) {
1144 printk(KERN_ERR "Illegal value %d\n", flag);
1145 return -1;
1146 }
1147 /*
1148 * We expect this value to be non-zero when generic Block Layer
1149 * Discard supported is detected iblock_create_virtdevice().
1150 */
1151 if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1152 printk(KERN_ERR "Generic Block Discard not supported\n");
1153 return -ENOSYS;
1154 }
1155
1156 DEV_ATTRIB(dev)->emulate_tpws = flag;
1157 printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1158 dev, flag);
1159 return 0;
1160 }
1161
1162 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1163 {
1164 if ((flag != 0) && (flag != 1)) {
1165 printk(KERN_ERR "Illegal value %d\n", flag);
1166 return -1;
1167 }
1168 DEV_ATTRIB(dev)->enforce_pr_isids = flag;
1169 printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1170 (DEV_ATTRIB(dev)->enforce_pr_isids) ? "Enabled" : "Disabled");
1171 return 0;
1172 }
1173
1174 /*
1175 * Note, this can only be called on unexported SE Device Object.
1176 */
1177 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1178 {
1179 u32 orig_queue_depth = dev->queue_depth;
1180
1181 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1182 printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
1183 " dev_export_obj: %d count exists\n", dev,
1184 atomic_read(&dev->dev_export_obj.obj_access_count));
1185 return -1;
1186 }
1187 if (!(queue_depth)) {
1188 printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
1189 "_depth\n", dev);
1190 return -1;
1191 }
1192
1193 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1194 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1195 printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
1196 " exceeds TCM/SE_Device TCQ: %u\n",
1197 dev, queue_depth,
1198 DEV_ATTRIB(dev)->hw_queue_depth);
1199 return -1;
1200 }
1201 } else {
1202 if (queue_depth > DEV_ATTRIB(dev)->queue_depth) {
1203 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1204 printk(KERN_ERR "dev[%p]: Passed queue_depth:"
1205 " %u exceeds TCM/SE_Device MAX"
1206 " TCQ: %u\n", dev, queue_depth,
1207 DEV_ATTRIB(dev)->hw_queue_depth);
1208 return -1;
1209 }
1210 }
1211 }
1212
1213 DEV_ATTRIB(dev)->queue_depth = dev->queue_depth = queue_depth;
1214 if (queue_depth > orig_queue_depth)
1215 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1216 else if (queue_depth < orig_queue_depth)
1217 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1218
1219 printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
1220 dev, queue_depth);
1221 return 0;
1222 }
1223
1224 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1225 {
1226 int force = 0; /* Force setting for VDEVS */
1227
1228 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1229 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1230 " max_sectors while dev_export_obj: %d count exists\n",
1231 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1232 return -1;
1233 }
1234 if (!(max_sectors)) {
1235 printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
1236 " max_sectors\n", dev);
1237 return -1;
1238 }
1239 if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1240 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
1241 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1242 DA_STATUS_MAX_SECTORS_MIN);
1243 return -1;
1244 }
1245 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1246 if (max_sectors > DEV_ATTRIB(dev)->hw_max_sectors) {
1247 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1248 " greater than TCM/SE_Device max_sectors:"
1249 " %u\n", dev, max_sectors,
1250 DEV_ATTRIB(dev)->hw_max_sectors);
1251 return -1;
1252 }
1253 } else {
1254 if (!(force) && (max_sectors >
1255 DEV_ATTRIB(dev)->hw_max_sectors)) {
1256 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1257 " greater than TCM/SE_Device max_sectors"
1258 ": %u, use force=1 to override.\n", dev,
1259 max_sectors, DEV_ATTRIB(dev)->hw_max_sectors);
1260 return -1;
1261 }
1262 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1263 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1264 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1265 " %u\n", dev, max_sectors,
1266 DA_STATUS_MAX_SECTORS_MAX);
1267 return -1;
1268 }
1269 }
1270
1271 DEV_ATTRIB(dev)->max_sectors = max_sectors;
1272 printk("dev[%p]: SE Device max_sectors changed to %u\n",
1273 dev, max_sectors);
1274 return 0;
1275 }
1276
1277 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1278 {
1279 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1280 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1281 " optimal_sectors while dev_export_obj: %d count exists\n",
1282 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1283 return -EINVAL;
1284 }
1285 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1286 printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
1287 " changed for TCM/pSCSI\n", dev);
1288 return -EINVAL;
1289 }
1290 if (optimal_sectors > DEV_ATTRIB(dev)->max_sectors) {
1291 printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
1292 " greater than max_sectors: %u\n", dev,
1293 optimal_sectors, DEV_ATTRIB(dev)->max_sectors);
1294 return -EINVAL;
1295 }
1296
1297 DEV_ATTRIB(dev)->optimal_sectors = optimal_sectors;
1298 printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
1299 dev, optimal_sectors);
1300 return 0;
1301 }
1302
1303 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1304 {
1305 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1306 printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
1307 " while dev_export_obj: %d count exists\n", dev,
1308 atomic_read(&dev->dev_export_obj.obj_access_count));
1309 return -1;
1310 }
1311
1312 if ((block_size != 512) &&
1313 (block_size != 1024) &&
1314 (block_size != 2048) &&
1315 (block_size != 4096)) {
1316 printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
1317 " for SE device, must be 512, 1024, 2048 or 4096\n",
1318 dev, block_size);
1319 return -1;
1320 }
1321
1322 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1323 printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
1324 " Physical Device, use for Linux/SCSI to change"
1325 " block_size for underlying hardware\n", dev);
1326 return -1;
1327 }
1328
1329 DEV_ATTRIB(dev)->block_size = block_size;
1330 printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
1331 dev, block_size);
1332 return 0;
1333 }
1334
1335 struct se_lun *core_dev_add_lun(
1336 struct se_portal_group *tpg,
1337 struct se_hba *hba,
1338 struct se_device *dev,
1339 u32 lun)
1340 {
1341 struct se_lun *lun_p;
1342 u32 lun_access = 0;
1343
1344 if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1345 printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
1346 atomic_read(&dev->dev_access_obj.obj_access_count));
1347 return NULL;
1348 }
1349
1350 lun_p = core_tpg_pre_addlun(tpg, lun);
1351 if ((IS_ERR(lun_p)) || !(lun_p))
1352 return NULL;
1353
1354 if (dev->dev_flags & DF_READ_ONLY)
1355 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1356 else
1357 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1358
1359 if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1360 return NULL;
1361
1362 printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1363 " CORE HBA: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1364 TPG_TFO(tpg)->tpg_get_tag(tpg), lun_p->unpacked_lun,
1365 TPG_TFO(tpg)->get_fabric_name(), hba->hba_id);
1366 /*
1367 * Update LUN maps for dynamically added initiators when
1368 * generate_node_acl is enabled.
1369 */
1370 if (TPG_TFO(tpg)->tpg_check_demo_mode(tpg)) {
1371 struct se_node_acl *acl;
1372 spin_lock_bh(&tpg->acl_node_lock);
1373 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1374 if (acl->dynamic_node_acl) {
1375 spin_unlock_bh(&tpg->acl_node_lock);
1376 core_tpg_add_node_to_devs(acl, tpg);
1377 spin_lock_bh(&tpg->acl_node_lock);
1378 }
1379 }
1380 spin_unlock_bh(&tpg->acl_node_lock);
1381 }
1382
1383 return lun_p;
1384 }
1385
1386 /* core_dev_del_lun():
1387 *
1388 *
1389 */
1390 int core_dev_del_lun(
1391 struct se_portal_group *tpg,
1392 u32 unpacked_lun)
1393 {
1394 struct se_lun *lun;
1395 int ret = 0;
1396
1397 lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1398 if (!(lun))
1399 return ret;
1400
1401 core_tpg_post_dellun(tpg, lun);
1402
1403 printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1404 " device object\n", TPG_TFO(tpg)->get_fabric_name(),
1405 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun,
1406 TPG_TFO(tpg)->get_fabric_name());
1407
1408 return 0;
1409 }
1410
1411 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1412 {
1413 struct se_lun *lun;
1414
1415 spin_lock(&tpg->tpg_lun_lock);
1416 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1417 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1418 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1419 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1420 TRANSPORT_MAX_LUNS_PER_TPG-1,
1421 TPG_TFO(tpg)->tpg_get_tag(tpg));
1422 spin_unlock(&tpg->tpg_lun_lock);
1423 return NULL;
1424 }
1425 lun = &tpg->tpg_lun_list[unpacked_lun];
1426
1427 if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1428 printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
1429 " Target Portal Group: %hu, ignoring request.\n",
1430 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1431 TPG_TFO(tpg)->tpg_get_tag(tpg));
1432 spin_unlock(&tpg->tpg_lun_lock);
1433 return NULL;
1434 }
1435 spin_unlock(&tpg->tpg_lun_lock);
1436
1437 return lun;
1438 }
1439
1440 /* core_dev_get_lun():
1441 *
1442 *
1443 */
1444 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1445 {
1446 struct se_lun *lun;
1447
1448 spin_lock(&tpg->tpg_lun_lock);
1449 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1450 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1451 "_TPG-1: %u for Target Portal Group: %hu\n",
1452 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1453 TRANSPORT_MAX_LUNS_PER_TPG-1,
1454 TPG_TFO(tpg)->tpg_get_tag(tpg));
1455 spin_unlock(&tpg->tpg_lun_lock);
1456 return NULL;
1457 }
1458 lun = &tpg->tpg_lun_list[unpacked_lun];
1459
1460 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1461 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1462 " Target Portal Group: %hu, ignoring request.\n",
1463 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1464 TPG_TFO(tpg)->tpg_get_tag(tpg));
1465 spin_unlock(&tpg->tpg_lun_lock);
1466 return NULL;
1467 }
1468 spin_unlock(&tpg->tpg_lun_lock);
1469
1470 return lun;
1471 }
1472
1473 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1474 struct se_portal_group *tpg,
1475 u32 mapped_lun,
1476 char *initiatorname,
1477 int *ret)
1478 {
1479 struct se_lun_acl *lacl;
1480 struct se_node_acl *nacl;
1481
1482 if (strlen(initiatorname) > TRANSPORT_IQN_LEN) {
1483 printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
1484 TPG_TFO(tpg)->get_fabric_name());
1485 *ret = -EOVERFLOW;
1486 return NULL;
1487 }
1488 nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1489 if (!(nacl)) {
1490 *ret = -EINVAL;
1491 return NULL;
1492 }
1493 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1494 if (!(lacl)) {
1495 printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
1496 *ret = -ENOMEM;
1497 return NULL;
1498 }
1499
1500 INIT_LIST_HEAD(&lacl->lacl_list);
1501 lacl->mapped_lun = mapped_lun;
1502 lacl->se_lun_nacl = nacl;
1503 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1504
1505 return lacl;
1506 }
1507
1508 int core_dev_add_initiator_node_lun_acl(
1509 struct se_portal_group *tpg,
1510 struct se_lun_acl *lacl,
1511 u32 unpacked_lun,
1512 u32 lun_access)
1513 {
1514 struct se_lun *lun;
1515 struct se_node_acl *nacl;
1516
1517 lun = core_dev_get_lun(tpg, unpacked_lun);
1518 if (!(lun)) {
1519 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1520 " Target Portal Group: %hu, ignoring request.\n",
1521 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1522 TPG_TFO(tpg)->tpg_get_tag(tpg));
1523 return -EINVAL;
1524 }
1525
1526 nacl = lacl->se_lun_nacl;
1527 if (!(nacl))
1528 return -EINVAL;
1529
1530 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1531 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1532 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1533
1534 lacl->se_lun = lun;
1535
1536 if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1537 lun_access, nacl, tpg, 1) < 0)
1538 return -EINVAL;
1539
1540 spin_lock(&lun->lun_acl_lock);
1541 list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1542 atomic_inc(&lun->lun_acl_count);
1543 smp_mb__after_atomic_inc();
1544 spin_unlock(&lun->lun_acl_lock);
1545
1546 printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1547 " InitiatorNode: %s\n", TPG_TFO(tpg)->get_fabric_name(),
1548 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1549 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1550 lacl->initiatorname);
1551 /*
1552 * Check to see if there are any existing persistent reservation APTPL
1553 * pre-registrations that need to be enabled for this LUN ACL..
1554 */
1555 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1556 return 0;
1557 }
1558
1559 /* core_dev_del_initiator_node_lun_acl():
1560 *
1561 *
1562 */
1563 int core_dev_del_initiator_node_lun_acl(
1564 struct se_portal_group *tpg,
1565 struct se_lun *lun,
1566 struct se_lun_acl *lacl)
1567 {
1568 struct se_node_acl *nacl;
1569
1570 nacl = lacl->se_lun_nacl;
1571 if (!(nacl))
1572 return -EINVAL;
1573
1574 spin_lock(&lun->lun_acl_lock);
1575 list_del(&lacl->lacl_list);
1576 atomic_dec(&lun->lun_acl_count);
1577 smp_mb__after_atomic_dec();
1578 spin_unlock(&lun->lun_acl_lock);
1579
1580 core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1581 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1582
1583 lacl->se_lun = NULL;
1584
1585 printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1586 " InitiatorNode: %s Mapped LUN: %u\n",
1587 TPG_TFO(tpg)->get_fabric_name(),
1588 TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
1589 lacl->initiatorname, lacl->mapped_lun);
1590
1591 return 0;
1592 }
1593
1594 void core_dev_free_initiator_node_lun_acl(
1595 struct se_portal_group *tpg,
1596 struct se_lun_acl *lacl)
1597 {
1598 printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1599 " Mapped LUN: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1600 TPG_TFO(tpg)->tpg_get_tag(tpg),
1601 TPG_TFO(tpg)->get_fabric_name(),
1602 lacl->initiatorname, lacl->mapped_lun);
1603
1604 kfree(lacl);
1605 }
1606
1607 int core_dev_setup_virtual_lun0(void)
1608 {
1609 struct se_hba *hba;
1610 struct se_device *dev;
1611 struct se_subsystem_dev *se_dev = NULL;
1612 struct se_subsystem_api *t;
1613 char buf[16];
1614 int ret;
1615
1616 hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
1617 if (IS_ERR(hba))
1618 return PTR_ERR(hba);
1619
1620 se_global->g_lun0_hba = hba;
1621 t = hba->transport;
1622
1623 se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1624 if (!(se_dev)) {
1625 printk(KERN_ERR "Unable to allocate memory for"
1626 " struct se_subsystem_dev\n");
1627 ret = -ENOMEM;
1628 goto out;
1629 }
1630 INIT_LIST_HEAD(&se_dev->g_se_dev_list);
1631 INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1632 spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1633 INIT_LIST_HEAD(&se_dev->t10_reservation.registration_list);
1634 INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
1635 spin_lock_init(&se_dev->t10_reservation.registration_lock);
1636 spin_lock_init(&se_dev->t10_reservation.aptpl_reg_lock);
1637 INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1638 spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1639 spin_lock_init(&se_dev->se_dev_lock);
1640 se_dev->t10_reservation.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1641 se_dev->t10_wwn.t10_sub_dev = se_dev;
1642 se_dev->t10_alua.t10_sub_dev = se_dev;
1643 se_dev->se_dev_attrib.da_sub_dev = se_dev;
1644 se_dev->se_dev_hba = hba;
1645
1646 se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1647 if (!(se_dev->se_dev_su_ptr)) {
1648 printk(KERN_ERR "Unable to locate subsystem dependent pointer"
1649 " from allocate_virtdevice()\n");
1650 ret = -ENOMEM;
1651 goto out;
1652 }
1653 se_global->g_lun0_su_dev = se_dev;
1654
1655 memset(buf, 0, 16);
1656 sprintf(buf, "rd_pages=8");
1657 t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1658
1659 dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1660 if (!(dev) || IS_ERR(dev)) {
1661 ret = -ENOMEM;
1662 goto out;
1663 }
1664 se_dev->se_dev_ptr = dev;
1665 se_global->g_lun0_dev = dev;
1666
1667 return 0;
1668 out:
1669 se_global->g_lun0_su_dev = NULL;
1670 kfree(se_dev);
1671 if (se_global->g_lun0_hba) {
1672 core_delete_hba(se_global->g_lun0_hba);
1673 se_global->g_lun0_hba = NULL;
1674 }
1675 return ret;
1676 }
1677
1678
1679 void core_dev_release_virtual_lun0(void)
1680 {
1681 struct se_hba *hba = se_global->g_lun0_hba;
1682 struct se_subsystem_dev *su_dev = se_global->g_lun0_su_dev;
1683
1684 if (!(hba))
1685 return;
1686
1687 if (se_global->g_lun0_dev)
1688 se_free_virtual_device(se_global->g_lun0_dev, hba);
1689
1690 kfree(su_dev);
1691 core_delete_hba(hba);
1692 }
Linux kernel - Deliverables
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