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target: Remove obsolete DF_READ_ONLY usage
[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 TCM Virtual Device and Disk Transport
5 * agnostic related functions.
6 *
7 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
8 * Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved.
9 * Copyright (c) 2007-2010 Rising Tide Systems
10 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 *
12 * Nicholas A. Bellinger <nab@kernel.org>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 *
28 ******************************************************************************/
29
30 #include <linux/net.h>
31 #include <linux/string.h>
32 #include <linux/delay.h>
33 #include <linux/timer.h>
34 #include <linux/slab.h>
35 #include <linux/spinlock.h>
36 #include <linux/kthread.h>
37 #include <linux/in.h>
38 #include <linux/export.h>
39 #include <net/sock.h>
40 #include <net/tcp.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_device.h>
43
44 #include <target/target_core_base.h>
45 #include <target/target_core_backend.h>
46 #include <target/target_core_fabric.h>
47
48 #include "target_core_internal.h"
49 #include "target_core_alua.h"
50 #include "target_core_pr.h"
51 #include "target_core_ua.h"
52
53 static void se_dev_start(struct se_device *dev);
54 static void se_dev_stop(struct se_device *dev);
55
56 static struct se_hba *lun0_hba;
57 static struct se_subsystem_dev *lun0_su_dev;
58 /* not static, needed by tpg.c */
59 struct se_device *g_lun0_dev;
60
61 int transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
62 {
63 struct se_lun *se_lun = NULL;
64 struct se_session *se_sess = se_cmd->se_sess;
65 struct se_device *dev;
66 unsigned long flags;
67
68 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
69 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
70 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
71 return -ENODEV;
72 }
73
74 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
75 se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
76 if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
77 struct se_dev_entry *deve = se_cmd->se_deve;
78
79 deve->total_cmds++;
80 deve->total_bytes += se_cmd->data_length;
81
82 if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
83 (deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
84 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
85 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
86 pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
87 " Access for 0x%08x\n",
88 se_cmd->se_tfo->get_fabric_name(),
89 unpacked_lun);
90 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
91 return -EACCES;
92 }
93
94 if (se_cmd->data_direction == DMA_TO_DEVICE)
95 deve->write_bytes += se_cmd->data_length;
96 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
97 deve->read_bytes += se_cmd->data_length;
98
99 deve->deve_cmds++;
100
101 se_lun = deve->se_lun;
102 se_cmd->se_lun = deve->se_lun;
103 se_cmd->pr_res_key = deve->pr_res_key;
104 se_cmd->orig_fe_lun = unpacked_lun;
105 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
106 }
107 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
108
109 if (!se_lun) {
110 /*
111 * Use the se_portal_group->tpg_virt_lun0 to allow for
112 * REPORT_LUNS, et al to be returned when no active
113 * MappedLUN=0 exists for this Initiator Port.
114 */
115 if (unpacked_lun != 0) {
116 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
117 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
118 pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
119 " Access for 0x%08x\n",
120 se_cmd->se_tfo->get_fabric_name(),
121 unpacked_lun);
122 return -ENODEV;
123 }
124 /*
125 * Force WRITE PROTECT for virtual LUN 0
126 */
127 if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
128 (se_cmd->data_direction != DMA_NONE)) {
129 se_cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
130 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
131 return -EACCES;
132 }
133
134 se_lun = &se_sess->se_tpg->tpg_virt_lun0;
135 se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
136 se_cmd->orig_fe_lun = 0;
137 se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
138 }
139 /*
140 * Determine if the struct se_lun is online.
141 * FIXME: Check for LUN_RESET + UNIT Attention
142 */
143 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
144 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
145 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
146 return -ENODEV;
147 }
148
149 /* Directly associate cmd with se_dev */
150 se_cmd->se_dev = se_lun->lun_se_dev;
151
152 /* TODO: get rid of this and use atomics for stats */
153 dev = se_lun->lun_se_dev;
154 spin_lock_irqsave(&dev->stats_lock, flags);
155 dev->num_cmds++;
156 if (se_cmd->data_direction == DMA_TO_DEVICE)
157 dev->write_bytes += se_cmd->data_length;
158 else if (se_cmd->data_direction == DMA_FROM_DEVICE)
159 dev->read_bytes += se_cmd->data_length;
160 spin_unlock_irqrestore(&dev->stats_lock, flags);
161
162 spin_lock_irqsave(&se_lun->lun_cmd_lock, flags);
163 list_add_tail(&se_cmd->se_lun_node, &se_lun->lun_cmd_list);
164 spin_unlock_irqrestore(&se_lun->lun_cmd_lock, flags);
165
166 return 0;
167 }
168 EXPORT_SYMBOL(transport_lookup_cmd_lun);
169
170 int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
171 {
172 struct se_dev_entry *deve;
173 struct se_lun *se_lun = NULL;
174 struct se_session *se_sess = se_cmd->se_sess;
175 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
176 unsigned long flags;
177
178 if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
179 se_cmd->scsi_sense_reason = TCM_NON_EXISTENT_LUN;
180 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
181 return -ENODEV;
182 }
183
184 spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
185 se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
186 deve = se_cmd->se_deve;
187
188 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
189 se_tmr->tmr_lun = deve->se_lun;
190 se_cmd->se_lun = deve->se_lun;
191 se_lun = deve->se_lun;
192 se_cmd->pr_res_key = deve->pr_res_key;
193 se_cmd->orig_fe_lun = unpacked_lun;
194 }
195 spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
196
197 if (!se_lun) {
198 pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
199 " Access for 0x%08x\n",
200 se_cmd->se_tfo->get_fabric_name(),
201 unpacked_lun);
202 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
203 return -ENODEV;
204 }
205 /*
206 * Determine if the struct se_lun is online.
207 * FIXME: Check for LUN_RESET + UNIT Attention
208 */
209 if (se_dev_check_online(se_lun->lun_se_dev) != 0) {
210 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
211 return -ENODEV;
212 }
213
214 /* Directly associate cmd with se_dev */
215 se_cmd->se_dev = se_lun->lun_se_dev;
216 se_tmr->tmr_dev = se_lun->lun_se_dev;
217
218 spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
219 list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
220 spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
221
222 return 0;
223 }
224 EXPORT_SYMBOL(transport_lookup_tmr_lun);
225
226 /*
227 * This function is called from core_scsi3_emulate_pro_register_and_move()
228 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
229 * when a matching rtpi is found.
230 */
231 struct se_dev_entry *core_get_se_deve_from_rtpi(
232 struct se_node_acl *nacl,
233 u16 rtpi)
234 {
235 struct se_dev_entry *deve;
236 struct se_lun *lun;
237 struct se_port *port;
238 struct se_portal_group *tpg = nacl->se_tpg;
239 u32 i;
240
241 spin_lock_irq(&nacl->device_list_lock);
242 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
243 deve = nacl->device_list[i];
244
245 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
246 continue;
247
248 lun = deve->se_lun;
249 if (!lun) {
250 pr_err("%s device entries device pointer is"
251 " NULL, but Initiator has access.\n",
252 tpg->se_tpg_tfo->get_fabric_name());
253 continue;
254 }
255 port = lun->lun_sep;
256 if (!port) {
257 pr_err("%s device entries device pointer is"
258 " NULL, but Initiator has access.\n",
259 tpg->se_tpg_tfo->get_fabric_name());
260 continue;
261 }
262 if (port->sep_rtpi != rtpi)
263 continue;
264
265 atomic_inc(&deve->pr_ref_count);
266 smp_mb__after_atomic_inc();
267 spin_unlock_irq(&nacl->device_list_lock);
268
269 return deve;
270 }
271 spin_unlock_irq(&nacl->device_list_lock);
272
273 return NULL;
274 }
275
276 int core_free_device_list_for_node(
277 struct se_node_acl *nacl,
278 struct se_portal_group *tpg)
279 {
280 struct se_dev_entry *deve;
281 struct se_lun *lun;
282 u32 i;
283
284 if (!nacl->device_list)
285 return 0;
286
287 spin_lock_irq(&nacl->device_list_lock);
288 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
289 deve = nacl->device_list[i];
290
291 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
292 continue;
293
294 if (!deve->se_lun) {
295 pr_err("%s device entries device pointer is"
296 " NULL, but Initiator has access.\n",
297 tpg->se_tpg_tfo->get_fabric_name());
298 continue;
299 }
300 lun = deve->se_lun;
301
302 spin_unlock_irq(&nacl->device_list_lock);
303 core_update_device_list_for_node(lun, NULL, deve->mapped_lun,
304 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
305 spin_lock_irq(&nacl->device_list_lock);
306 }
307 spin_unlock_irq(&nacl->device_list_lock);
308
309 array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
310 nacl->device_list = NULL;
311
312 return 0;
313 }
314
315 void core_dec_lacl_count(struct se_node_acl *se_nacl, struct se_cmd *se_cmd)
316 {
317 struct se_dev_entry *deve;
318 unsigned long flags;
319
320 spin_lock_irqsave(&se_nacl->device_list_lock, flags);
321 deve = se_nacl->device_list[se_cmd->orig_fe_lun];
322 deve->deve_cmds--;
323 spin_unlock_irqrestore(&se_nacl->device_list_lock, flags);
324 }
325
326 void core_update_device_list_access(
327 u32 mapped_lun,
328 u32 lun_access,
329 struct se_node_acl *nacl)
330 {
331 struct se_dev_entry *deve;
332
333 spin_lock_irq(&nacl->device_list_lock);
334 deve = nacl->device_list[mapped_lun];
335 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
336 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
337 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
338 } else {
339 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
340 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
341 }
342 spin_unlock_irq(&nacl->device_list_lock);
343 }
344
345 /* core_update_device_list_for_node():
346 *
347 *
348 */
349 int core_update_device_list_for_node(
350 struct se_lun *lun,
351 struct se_lun_acl *lun_acl,
352 u32 mapped_lun,
353 u32 lun_access,
354 struct se_node_acl *nacl,
355 struct se_portal_group *tpg,
356 int enable)
357 {
358 struct se_port *port = lun->lun_sep;
359 struct se_dev_entry *deve = nacl->device_list[mapped_lun];
360 int trans = 0;
361 /*
362 * If the MappedLUN entry is being disabled, the entry in
363 * port->sep_alua_list must be removed now before clearing the
364 * struct se_dev_entry pointers below as logic in
365 * core_alua_do_transition_tg_pt() depends on these being present.
366 */
367 if (!enable) {
368 /*
369 * deve->se_lun_acl will be NULL for demo-mode created LUNs
370 * that have not been explicitly concerted to MappedLUNs ->
371 * struct se_lun_acl, but we remove deve->alua_port_list from
372 * port->sep_alua_list. This also means that active UAs and
373 * NodeACL context specific PR metadata for demo-mode
374 * MappedLUN *deve will be released below..
375 */
376 spin_lock_bh(&port->sep_alua_lock);
377 list_del(&deve->alua_port_list);
378 spin_unlock_bh(&port->sep_alua_lock);
379 }
380
381 spin_lock_irq(&nacl->device_list_lock);
382 if (enable) {
383 /*
384 * Check if the call is handling demo mode -> explict LUN ACL
385 * transition. This transition must be for the same struct se_lun
386 * + mapped_lun that was setup in demo mode..
387 */
388 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
389 if (deve->se_lun_acl != NULL) {
390 pr_err("struct se_dev_entry->se_lun_acl"
391 " already set for demo mode -> explict"
392 " LUN ACL transition\n");
393 spin_unlock_irq(&nacl->device_list_lock);
394 return -EINVAL;
395 }
396 if (deve->se_lun != lun) {
397 pr_err("struct se_dev_entry->se_lun does"
398 " match passed struct se_lun for demo mode"
399 " -> explict LUN ACL transition\n");
400 spin_unlock_irq(&nacl->device_list_lock);
401 return -EINVAL;
402 }
403 deve->se_lun_acl = lun_acl;
404 trans = 1;
405 } else {
406 deve->se_lun = lun;
407 deve->se_lun_acl = lun_acl;
408 deve->mapped_lun = mapped_lun;
409 deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
410 }
411
412 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
413 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
414 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
415 } else {
416 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
417 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
418 }
419
420 if (trans) {
421 spin_unlock_irq(&nacl->device_list_lock);
422 return 0;
423 }
424 deve->creation_time = get_jiffies_64();
425 deve->attach_count++;
426 spin_unlock_irq(&nacl->device_list_lock);
427
428 spin_lock_bh(&port->sep_alua_lock);
429 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
430 spin_unlock_bh(&port->sep_alua_lock);
431
432 return 0;
433 }
434 /*
435 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
436 * PR operation to complete.
437 */
438 spin_unlock_irq(&nacl->device_list_lock);
439 while (atomic_read(&deve->pr_ref_count) != 0)
440 cpu_relax();
441 spin_lock_irq(&nacl->device_list_lock);
442 /*
443 * Disable struct se_dev_entry LUN ACL mapping
444 */
445 core_scsi3_ua_release_all(deve);
446 deve->se_lun = NULL;
447 deve->se_lun_acl = NULL;
448 deve->lun_flags = 0;
449 deve->creation_time = 0;
450 deve->attach_count--;
451 spin_unlock_irq(&nacl->device_list_lock);
452
453 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
454 return 0;
455 }
456
457 /* core_clear_lun_from_tpg():
458 *
459 *
460 */
461 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
462 {
463 struct se_node_acl *nacl;
464 struct se_dev_entry *deve;
465 u32 i;
466
467 spin_lock_irq(&tpg->acl_node_lock);
468 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
469 spin_unlock_irq(&tpg->acl_node_lock);
470
471 spin_lock_irq(&nacl->device_list_lock);
472 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
473 deve = nacl->device_list[i];
474 if (lun != deve->se_lun)
475 continue;
476 spin_unlock_irq(&nacl->device_list_lock);
477
478 core_update_device_list_for_node(lun, NULL,
479 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
480 nacl, tpg, 0);
481
482 spin_lock_irq(&nacl->device_list_lock);
483 }
484 spin_unlock_irq(&nacl->device_list_lock);
485
486 spin_lock_irq(&tpg->acl_node_lock);
487 }
488 spin_unlock_irq(&tpg->acl_node_lock);
489 }
490
491 static struct se_port *core_alloc_port(struct se_device *dev)
492 {
493 struct se_port *port, *port_tmp;
494
495 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
496 if (!port) {
497 pr_err("Unable to allocate struct se_port\n");
498 return ERR_PTR(-ENOMEM);
499 }
500 INIT_LIST_HEAD(&port->sep_alua_list);
501 INIT_LIST_HEAD(&port->sep_list);
502 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
503 spin_lock_init(&port->sep_alua_lock);
504 mutex_init(&port->sep_tg_pt_md_mutex);
505
506 spin_lock(&dev->se_port_lock);
507 if (dev->dev_port_count == 0x0000ffff) {
508 pr_warn("Reached dev->dev_port_count =="
509 " 0x0000ffff\n");
510 spin_unlock(&dev->se_port_lock);
511 return ERR_PTR(-ENOSPC);
512 }
513 again:
514 /*
515 * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
516 * Here is the table from spc4r17 section 7.7.3.8.
517 *
518 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
519 *
520 * Code Description
521 * 0h Reserved
522 * 1h Relative port 1, historically known as port A
523 * 2h Relative port 2, historically known as port B
524 * 3h to FFFFh Relative port 3 through 65 535
525 */
526 port->sep_rtpi = dev->dev_rpti_counter++;
527 if (!port->sep_rtpi)
528 goto again;
529
530 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
531 /*
532 * Make sure RELATIVE TARGET PORT IDENTIFER is unique
533 * for 16-bit wrap..
534 */
535 if (port->sep_rtpi == port_tmp->sep_rtpi)
536 goto again;
537 }
538 spin_unlock(&dev->se_port_lock);
539
540 return port;
541 }
542
543 static void core_export_port(
544 struct se_device *dev,
545 struct se_portal_group *tpg,
546 struct se_port *port,
547 struct se_lun *lun)
548 {
549 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
550 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
551
552 spin_lock(&dev->se_port_lock);
553 spin_lock(&lun->lun_sep_lock);
554 port->sep_tpg = tpg;
555 port->sep_lun = lun;
556 lun->lun_sep = port;
557 spin_unlock(&lun->lun_sep_lock);
558
559 list_add_tail(&port->sep_list, &dev->dev_sep_list);
560 spin_unlock(&dev->se_port_lock);
561
562 if (su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
563 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
564 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
565 pr_err("Unable to allocate t10_alua_tg_pt"
566 "_gp_member_t\n");
567 return;
568 }
569 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
570 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
571 su_dev->t10_alua.default_tg_pt_gp);
572 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
573 pr_debug("%s/%s: Adding to default ALUA Target Port"
574 " Group: alua/default_tg_pt_gp\n",
575 dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
576 }
577
578 dev->dev_port_count++;
579 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
580 }
581
582 /*
583 * Called with struct se_device->se_port_lock spinlock held.
584 */
585 static void core_release_port(struct se_device *dev, struct se_port *port)
586 __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
587 {
588 /*
589 * Wait for any port reference for PR ALL_TG_PT=1 operation
590 * to complete in __core_scsi3_alloc_registration()
591 */
592 spin_unlock(&dev->se_port_lock);
593 if (atomic_read(&port->sep_tg_pt_ref_cnt))
594 cpu_relax();
595 spin_lock(&dev->se_port_lock);
596
597 core_alua_free_tg_pt_gp_mem(port);
598
599 list_del(&port->sep_list);
600 dev->dev_port_count--;
601 kfree(port);
602 }
603
604 int core_dev_export(
605 struct se_device *dev,
606 struct se_portal_group *tpg,
607 struct se_lun *lun)
608 {
609 struct se_port *port;
610
611 port = core_alloc_port(dev);
612 if (IS_ERR(port))
613 return PTR_ERR(port);
614
615 lun->lun_se_dev = dev;
616 se_dev_start(dev);
617
618 atomic_inc(&dev->dev_export_obj.obj_access_count);
619 core_export_port(dev, tpg, port, lun);
620 return 0;
621 }
622
623 void core_dev_unexport(
624 struct se_device *dev,
625 struct se_portal_group *tpg,
626 struct se_lun *lun)
627 {
628 struct se_port *port = lun->lun_sep;
629
630 spin_lock(&lun->lun_sep_lock);
631 if (lun->lun_se_dev == NULL) {
632 spin_unlock(&lun->lun_sep_lock);
633 return;
634 }
635 spin_unlock(&lun->lun_sep_lock);
636
637 spin_lock(&dev->se_port_lock);
638 atomic_dec(&dev->dev_export_obj.obj_access_count);
639 core_release_port(dev, port);
640 spin_unlock(&dev->se_port_lock);
641
642 se_dev_stop(dev);
643 lun->lun_se_dev = NULL;
644 }
645
646 int target_report_luns(struct se_task *se_task)
647 {
648 struct se_cmd *se_cmd = se_task->task_se_cmd;
649 struct se_dev_entry *deve;
650 struct se_session *se_sess = se_cmd->se_sess;
651 unsigned char *buf;
652 u32 lun_count = 0, offset = 8, i;
653
654 buf = transport_kmap_data_sg(se_cmd);
655 if (!buf)
656 return -ENOMEM;
657
658 /*
659 * If no struct se_session pointer is present, this struct se_cmd is
660 * coming via a target_core_mod PASSTHROUGH op, and not through
661 * a $FABRIC_MOD. In that case, report LUN=0 only.
662 */
663 if (!se_sess) {
664 int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
665 lun_count = 1;
666 goto done;
667 }
668
669 spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
670 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
671 deve = se_sess->se_node_acl->device_list[i];
672 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
673 continue;
674 /*
675 * We determine the correct LUN LIST LENGTH even once we
676 * have reached the initial allocation length.
677 * See SPC2-R20 7.19.
678 */
679 lun_count++;
680 if ((offset + 8) > se_cmd->data_length)
681 continue;
682
683 int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
684 offset += 8;
685 }
686 spin_unlock_irq(&se_sess->se_node_acl->device_list_lock);
687
688 /*
689 * See SPC3 r07, page 159.
690 */
691 done:
692 lun_count *= 8;
693 buf[0] = ((lun_count >> 24) & 0xff);
694 buf[1] = ((lun_count >> 16) & 0xff);
695 buf[2] = ((lun_count >> 8) & 0xff);
696 buf[3] = (lun_count & 0xff);
697 transport_kunmap_data_sg(se_cmd);
698
699 se_task->task_scsi_status = GOOD;
700 transport_complete_task(se_task, 1);
701 return 0;
702 }
703
704 /* se_release_device_for_hba():
705 *
706 *
707 */
708 void se_release_device_for_hba(struct se_device *dev)
709 {
710 struct se_hba *hba = dev->se_hba;
711
712 if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
713 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
714 (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
715 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
716 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
717 se_dev_stop(dev);
718
719 if (dev->dev_ptr) {
720 kthread_stop(dev->process_thread);
721 if (dev->transport->free_device)
722 dev->transport->free_device(dev->dev_ptr);
723 }
724
725 spin_lock(&hba->device_lock);
726 list_del(&dev->dev_list);
727 hba->dev_count--;
728 spin_unlock(&hba->device_lock);
729
730 core_scsi3_free_all_registrations(dev);
731 se_release_vpd_for_dev(dev);
732
733 kfree(dev);
734 }
735
736 void se_release_vpd_for_dev(struct se_device *dev)
737 {
738 struct t10_vpd *vpd, *vpd_tmp;
739
740 spin_lock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
741 list_for_each_entry_safe(vpd, vpd_tmp,
742 &dev->se_sub_dev->t10_wwn.t10_vpd_list, vpd_list) {
743 list_del(&vpd->vpd_list);
744 kfree(vpd);
745 }
746 spin_unlock(&dev->se_sub_dev->t10_wwn.t10_vpd_lock);
747 }
748
749 /* se_free_virtual_device():
750 *
751 * Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
752 */
753 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
754 {
755 if (!list_empty(&dev->dev_sep_list))
756 dump_stack();
757
758 core_alua_free_lu_gp_mem(dev);
759 se_release_device_for_hba(dev);
760
761 return 0;
762 }
763
764 static void se_dev_start(struct se_device *dev)
765 {
766 struct se_hba *hba = dev->se_hba;
767
768 spin_lock(&hba->device_lock);
769 atomic_inc(&dev->dev_obj.obj_access_count);
770 if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
771 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
772 dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
773 dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
774 } else if (dev->dev_status &
775 TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
776 dev->dev_status &=
777 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
778 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
779 }
780 }
781 spin_unlock(&hba->device_lock);
782 }
783
784 static void se_dev_stop(struct se_device *dev)
785 {
786 struct se_hba *hba = dev->se_hba;
787
788 spin_lock(&hba->device_lock);
789 atomic_dec(&dev->dev_obj.obj_access_count);
790 if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
791 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
792 dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
793 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
794 } else if (dev->dev_status &
795 TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
796 dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
797 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
798 }
799 }
800 spin_unlock(&hba->device_lock);
801 }
802
803 int se_dev_check_online(struct se_device *dev)
804 {
805 unsigned long flags;
806 int ret;
807
808 spin_lock_irqsave(&dev->dev_status_lock, flags);
809 ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
810 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
811 spin_unlock_irqrestore(&dev->dev_status_lock, flags);
812
813 return ret;
814 }
815
816 int se_dev_check_shutdown(struct se_device *dev)
817 {
818 int ret;
819
820 spin_lock_irq(&dev->dev_status_lock);
821 ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
822 spin_unlock_irq(&dev->dev_status_lock);
823
824 return ret;
825 }
826
827 u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
828 {
829 u32 tmp, aligned_max_sectors;
830 /*
831 * Limit max_sectors to a PAGE_SIZE aligned value for modern
832 * transport_allocate_data_tasks() operation.
833 */
834 tmp = rounddown((max_sectors * block_size), PAGE_SIZE);
835 aligned_max_sectors = (tmp / block_size);
836 if (max_sectors != aligned_max_sectors) {
837 printk(KERN_INFO "Rounding down aligned max_sectors from %u"
838 " to %u\n", max_sectors, aligned_max_sectors);
839 return aligned_max_sectors;
840 }
841
842 return max_sectors;
843 }
844
845 void se_dev_set_default_attribs(
846 struct se_device *dev,
847 struct se_dev_limits *dev_limits)
848 {
849 struct queue_limits *limits = &dev_limits->limits;
850
851 dev->se_sub_dev->se_dev_attrib.emulate_dpo = DA_EMULATE_DPO;
852 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = DA_EMULATE_FUA_WRITE;
853 dev->se_sub_dev->se_dev_attrib.emulate_fua_read = DA_EMULATE_FUA_READ;
854 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
855 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
856 dev->se_sub_dev->se_dev_attrib.emulate_tas = DA_EMULATE_TAS;
857 dev->se_sub_dev->se_dev_attrib.emulate_tpu = DA_EMULATE_TPU;
858 dev->se_sub_dev->se_dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
859 dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
860 dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
861 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
862 dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
863 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
864 /*
865 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
866 * iblock_create_virtdevice() from struct queue_limits values
867 * if blk_queue_discard()==1
868 */
869 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
870 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
871 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
872 dev->se_sub_dev->se_dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
873 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
874 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
875 /*
876 * block_size is based on subsystem plugin dependent requirements.
877 */
878 dev->se_sub_dev->se_dev_attrib.hw_block_size = limits->logical_block_size;
879 dev->se_sub_dev->se_dev_attrib.block_size = limits->logical_block_size;
880 /*
881 * max_sectors is based on subsystem plugin dependent requirements.
882 */
883 dev->se_sub_dev->se_dev_attrib.hw_max_sectors = limits->max_hw_sectors;
884 /*
885 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
886 */
887 limits->max_sectors = se_dev_align_max_sectors(limits->max_sectors,
888 limits->logical_block_size);
889 dev->se_sub_dev->se_dev_attrib.max_sectors = limits->max_sectors;
890 /*
891 * Set fabric_max_sectors, which is reported in block limits
892 * VPD page (B0h).
893 */
894 dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
895 /*
896 * Set optimal_sectors from fabric_max_sectors, which can be
897 * lowered via configfs.
898 */
899 dev->se_sub_dev->se_dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
900 /*
901 * queue_depth is based on subsystem plugin dependent requirements.
902 */
903 dev->se_sub_dev->se_dev_attrib.hw_queue_depth = dev_limits->hw_queue_depth;
904 dev->se_sub_dev->se_dev_attrib.queue_depth = dev_limits->queue_depth;
905 }
906
907 int se_dev_set_max_unmap_lba_count(
908 struct se_device *dev,
909 u32 max_unmap_lba_count)
910 {
911 dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
912 pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
913 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count);
914 return 0;
915 }
916
917 int se_dev_set_max_unmap_block_desc_count(
918 struct se_device *dev,
919 u32 max_unmap_block_desc_count)
920 {
921 dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count =
922 max_unmap_block_desc_count;
923 pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
924 dev, dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count);
925 return 0;
926 }
927
928 int se_dev_set_unmap_granularity(
929 struct se_device *dev,
930 u32 unmap_granularity)
931 {
932 dev->se_sub_dev->se_dev_attrib.unmap_granularity = unmap_granularity;
933 pr_debug("dev[%p]: Set unmap_granularity: %u\n",
934 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity);
935 return 0;
936 }
937
938 int se_dev_set_unmap_granularity_alignment(
939 struct se_device *dev,
940 u32 unmap_granularity_alignment)
941 {
942 dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
943 pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
944 dev, dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment);
945 return 0;
946 }
947
948 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
949 {
950 if (flag != 0 && flag != 1) {
951 pr_err("Illegal value %d\n", flag);
952 return -EINVAL;
953 }
954
955 if (flag) {
956 pr_err("dpo_emulated not supported\n");
957 return -EINVAL;
958 }
959
960 return 0;
961 }
962
963 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
964 {
965 if (flag != 0 && flag != 1) {
966 pr_err("Illegal value %d\n", flag);
967 return -EINVAL;
968 }
969
970 if (flag && dev->transport->fua_write_emulated == 0) {
971 pr_err("fua_write_emulated not supported\n");
972 return -EINVAL;
973 }
974 dev->se_sub_dev->se_dev_attrib.emulate_fua_write = flag;
975 pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
976 dev, dev->se_sub_dev->se_dev_attrib.emulate_fua_write);
977 return 0;
978 }
979
980 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
981 {
982 if (flag != 0 && flag != 1) {
983 pr_err("Illegal value %d\n", flag);
984 return -EINVAL;
985 }
986
987 if (flag) {
988 pr_err("ua read emulated not supported\n");
989 return -EINVAL;
990 }
991
992 return 0;
993 }
994
995 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
996 {
997 if (flag != 0 && flag != 1) {
998 pr_err("Illegal value %d\n", flag);
999 return -EINVAL;
1000 }
1001 if (flag && dev->transport->write_cache_emulated == 0) {
1002 pr_err("write_cache_emulated not supported\n");
1003 return -EINVAL;
1004 }
1005 dev->se_sub_dev->se_dev_attrib.emulate_write_cache = flag;
1006 pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1007 dev, dev->se_sub_dev->se_dev_attrib.emulate_write_cache);
1008 return 0;
1009 }
1010
1011 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1012 {
1013 if ((flag != 0) && (flag != 1) && (flag != 2)) {
1014 pr_err("Illegal value %d\n", flag);
1015 return -EINVAL;
1016 }
1017
1018 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1019 pr_err("dev[%p]: Unable to change SE Device"
1020 " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1021 " exists\n", dev,
1022 atomic_read(&dev->dev_export_obj.obj_access_count));
1023 return -EINVAL;
1024 }
1025 dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl = flag;
1026 pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1027 dev, dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl);
1028
1029 return 0;
1030 }
1031
1032 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1033 {
1034 if ((flag != 0) && (flag != 1)) {
1035 pr_err("Illegal value %d\n", flag);
1036 return -EINVAL;
1037 }
1038
1039 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1040 pr_err("dev[%p]: Unable to change SE Device TAS while"
1041 " dev_export_obj: %d count exists\n", dev,
1042 atomic_read(&dev->dev_export_obj.obj_access_count));
1043 return -EINVAL;
1044 }
1045 dev->se_sub_dev->se_dev_attrib.emulate_tas = flag;
1046 pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1047 dev, (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
1048
1049 return 0;
1050 }
1051
1052 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1053 {
1054 if ((flag != 0) && (flag != 1)) {
1055 pr_err("Illegal value %d\n", flag);
1056 return -EINVAL;
1057 }
1058 /*
1059 * We expect this value to be non-zero when generic Block Layer
1060 * Discard supported is detected iblock_create_virtdevice().
1061 */
1062 if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1063 pr_err("Generic Block Discard not supported\n");
1064 return -ENOSYS;
1065 }
1066
1067 dev->se_sub_dev->se_dev_attrib.emulate_tpu = flag;
1068 pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1069 dev, flag);
1070 return 0;
1071 }
1072
1073 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1074 {
1075 if ((flag != 0) && (flag != 1)) {
1076 pr_err("Illegal value %d\n", flag);
1077 return -EINVAL;
1078 }
1079 /*
1080 * We expect this value to be non-zero when generic Block Layer
1081 * Discard supported is detected iblock_create_virtdevice().
1082 */
1083 if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
1084 pr_err("Generic Block Discard not supported\n");
1085 return -ENOSYS;
1086 }
1087
1088 dev->se_sub_dev->se_dev_attrib.emulate_tpws = flag;
1089 pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1090 dev, flag);
1091 return 0;
1092 }
1093
1094 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1095 {
1096 if ((flag != 0) && (flag != 1)) {
1097 pr_err("Illegal value %d\n", flag);
1098 return -EINVAL;
1099 }
1100 dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = flag;
1101 pr_debug("dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1102 (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids) ? "Enabled" : "Disabled");
1103 return 0;
1104 }
1105
1106 int se_dev_set_is_nonrot(struct se_device *dev, int flag)
1107 {
1108 if ((flag != 0) && (flag != 1)) {
1109 printk(KERN_ERR "Illegal value %d\n", flag);
1110 return -EINVAL;
1111 }
1112 dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
1113 pr_debug("dev[%p]: SE Device is_nonrot bit: %d\n",
1114 dev, flag);
1115 return 0;
1116 }
1117
1118 int se_dev_set_emulate_rest_reord(struct se_device *dev, int flag)
1119 {
1120 if (flag != 0) {
1121 printk(KERN_ERR "dev[%p]: SE Device emulatation of restricted"
1122 " reordering not implemented\n", dev);
1123 return -ENOSYS;
1124 }
1125 dev->se_sub_dev->se_dev_attrib.emulate_rest_reord = flag;
1126 pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n", dev, flag);
1127 return 0;
1128 }
1129
1130 /*
1131 * Note, this can only be called on unexported SE Device Object.
1132 */
1133 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1134 {
1135 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1136 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1137 " dev_export_obj: %d count exists\n", dev,
1138 atomic_read(&dev->dev_export_obj.obj_access_count));
1139 return -EINVAL;
1140 }
1141 if (!queue_depth) {
1142 pr_err("dev[%p]: Illegal ZERO value for queue"
1143 "_depth\n", dev);
1144 return -EINVAL;
1145 }
1146
1147 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1148 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1149 pr_err("dev[%p]: Passed queue_depth: %u"
1150 " exceeds TCM/SE_Device TCQ: %u\n",
1151 dev, queue_depth,
1152 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1153 return -EINVAL;
1154 }
1155 } else {
1156 if (queue_depth > dev->se_sub_dev->se_dev_attrib.queue_depth) {
1157 if (queue_depth > dev->se_sub_dev->se_dev_attrib.hw_queue_depth) {
1158 pr_err("dev[%p]: Passed queue_depth:"
1159 " %u exceeds TCM/SE_Device MAX"
1160 " TCQ: %u\n", dev, queue_depth,
1161 dev->se_sub_dev->se_dev_attrib.hw_queue_depth);
1162 return -EINVAL;
1163 }
1164 }
1165 }
1166
1167 dev->se_sub_dev->se_dev_attrib.queue_depth = dev->queue_depth = queue_depth;
1168 pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n",
1169 dev, queue_depth);
1170 return 0;
1171 }
1172
1173 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1174 {
1175 int force = 0; /* Force setting for VDEVS */
1176
1177 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1178 pr_err("dev[%p]: Unable to change SE Device"
1179 " max_sectors while dev_export_obj: %d count exists\n",
1180 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1181 return -EINVAL;
1182 }
1183 if (!max_sectors) {
1184 pr_err("dev[%p]: Illegal ZERO value for"
1185 " max_sectors\n", dev);
1186 return -EINVAL;
1187 }
1188 if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1189 pr_err("dev[%p]: Passed max_sectors: %u less than"
1190 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1191 DA_STATUS_MAX_SECTORS_MIN);
1192 return -EINVAL;
1193 }
1194 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1195 if (max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1196 pr_err("dev[%p]: Passed max_sectors: %u"
1197 " greater than TCM/SE_Device max_sectors:"
1198 " %u\n", dev, max_sectors,
1199 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1200 return -EINVAL;
1201 }
1202 } else {
1203 if (!force && (max_sectors >
1204 dev->se_sub_dev->se_dev_attrib.hw_max_sectors)) {
1205 pr_err("dev[%p]: Passed max_sectors: %u"
1206 " greater than TCM/SE_Device max_sectors"
1207 ": %u, use force=1 to override.\n", dev,
1208 max_sectors, dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1209 return -EINVAL;
1210 }
1211 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1212 pr_err("dev[%p]: Passed max_sectors: %u"
1213 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1214 " %u\n", dev, max_sectors,
1215 DA_STATUS_MAX_SECTORS_MAX);
1216 return -EINVAL;
1217 }
1218 }
1219 /*
1220 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1221 */
1222 max_sectors = se_dev_align_max_sectors(max_sectors,
1223 dev->se_sub_dev->se_dev_attrib.block_size);
1224
1225 dev->se_sub_dev->se_dev_attrib.max_sectors = max_sectors;
1226 pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1227 dev, max_sectors);
1228 return 0;
1229 }
1230
1231 int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
1232 {
1233 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1234 pr_err("dev[%p]: Unable to change SE Device"
1235 " fabric_max_sectors while dev_export_obj: %d count exists\n",
1236 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1237 return -EINVAL;
1238 }
1239 if (!fabric_max_sectors) {
1240 pr_err("dev[%p]: Illegal ZERO value for"
1241 " fabric_max_sectors\n", dev);
1242 return -EINVAL;
1243 }
1244 if (fabric_max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1245 pr_err("dev[%p]: Passed fabric_max_sectors: %u less than"
1246 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, fabric_max_sectors,
1247 DA_STATUS_MAX_SECTORS_MIN);
1248 return -EINVAL;
1249 }
1250 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1251 if (fabric_max_sectors > dev->se_sub_dev->se_dev_attrib.hw_max_sectors) {
1252 pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1253 " greater than TCM/SE_Device max_sectors:"
1254 " %u\n", dev, fabric_max_sectors,
1255 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
1256 return -EINVAL;
1257 }
1258 } else {
1259 if (fabric_max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1260 pr_err("dev[%p]: Passed fabric_max_sectors: %u"
1261 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1262 " %u\n", dev, fabric_max_sectors,
1263 DA_STATUS_MAX_SECTORS_MAX);
1264 return -EINVAL;
1265 }
1266 }
1267 /*
1268 * Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
1269 */
1270 fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
1271 dev->se_sub_dev->se_dev_attrib.block_size);
1272
1273 dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
1274 pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
1275 dev, fabric_max_sectors);
1276 return 0;
1277 }
1278
1279 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1280 {
1281 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1282 pr_err("dev[%p]: Unable to change SE Device"
1283 " optimal_sectors while dev_export_obj: %d count exists\n",
1284 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1285 return -EINVAL;
1286 }
1287 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1288 pr_err("dev[%p]: Passed optimal_sectors cannot be"
1289 " changed for TCM/pSCSI\n", dev);
1290 return -EINVAL;
1291 }
1292 if (optimal_sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
1293 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1294 " greater than fabric_max_sectors: %u\n", dev,
1295 optimal_sectors, dev->se_sub_dev->se_dev_attrib.fabric_max_sectors);
1296 return -EINVAL;
1297 }
1298
1299 dev->se_sub_dev->se_dev_attrib.optimal_sectors = optimal_sectors;
1300 pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1301 dev, optimal_sectors);
1302 return 0;
1303 }
1304
1305 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1306 {
1307 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1308 pr_err("dev[%p]: Unable to change SE Device block_size"
1309 " while dev_export_obj: %d count exists\n", dev,
1310 atomic_read(&dev->dev_export_obj.obj_access_count));
1311 return -EINVAL;
1312 }
1313
1314 if ((block_size != 512) &&
1315 (block_size != 1024) &&
1316 (block_size != 2048) &&
1317 (block_size != 4096)) {
1318 pr_err("dev[%p]: Illegal value for block_device: %u"
1319 " for SE device, must be 512, 1024, 2048 or 4096\n",
1320 dev, block_size);
1321 return -EINVAL;
1322 }
1323
1324 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1325 pr_err("dev[%p]: Not allowed to change block_size for"
1326 " Physical Device, use for Linux/SCSI to change"
1327 " block_size for underlying hardware\n", dev);
1328 return -EINVAL;
1329 }
1330
1331 dev->se_sub_dev->se_dev_attrib.block_size = block_size;
1332 pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1333 dev, block_size);
1334 return 0;
1335 }
1336
1337 struct se_lun *core_dev_add_lun(
1338 struct se_portal_group *tpg,
1339 struct se_hba *hba,
1340 struct se_device *dev,
1341 u32 lun)
1342 {
1343 struct se_lun *lun_p;
1344 int rc;
1345
1346 if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1347 pr_err("Unable to export struct se_device while dev_access_obj: %d\n",
1348 atomic_read(&dev->dev_access_obj.obj_access_count));
1349 return ERR_PTR(-EACCES);
1350 }
1351
1352 lun_p = core_tpg_pre_addlun(tpg, lun);
1353 if (IS_ERR(lun_p))
1354 return lun_p;
1355
1356 rc = core_tpg_post_addlun(tpg, lun_p,
1357 TRANSPORT_LUNFLAGS_READ_WRITE, dev);
1358 if (rc < 0)
1359 return ERR_PTR(rc);
1360
1361 pr_debug("%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1362 " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1363 tpg->se_tpg_tfo->tpg_get_tag(tpg), lun_p->unpacked_lun,
1364 tpg->se_tpg_tfo->get_fabric_name(), hba->hba_id);
1365 /*
1366 * Update LUN maps for dynamically added initiators when
1367 * generate_node_acl is enabled.
1368 */
1369 if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
1370 struct se_node_acl *acl;
1371 spin_lock_irq(&tpg->acl_node_lock);
1372 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1373 if (acl->dynamic_node_acl &&
1374 (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
1375 !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
1376 spin_unlock_irq(&tpg->acl_node_lock);
1377 core_tpg_add_node_to_devs(acl, tpg);
1378 spin_lock_irq(&tpg->acl_node_lock);
1379 }
1380 }
1381 spin_unlock_irq(&tpg->acl_node_lock);
1382 }
1383
1384 return lun_p;
1385 }
1386
1387 /* core_dev_del_lun():
1388 *
1389 *
1390 */
1391 int core_dev_del_lun(
1392 struct se_portal_group *tpg,
1393 u32 unpacked_lun)
1394 {
1395 struct se_lun *lun;
1396
1397 lun = core_tpg_pre_dellun(tpg, unpacked_lun);
1398 if (IS_ERR(lun))
1399 return PTR_ERR(lun);
1400
1401 core_tpg_post_dellun(tpg, lun);
1402
1403 pr_debug("%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1404 " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
1405 tpg->se_tpg_tfo->tpg_get_tag(tpg), unpacked_lun,
1406 tpg->se_tpg_tfo->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 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1418 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1419 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1420 TRANSPORT_MAX_LUNS_PER_TPG-1,
1421 tpg->se_tpg_tfo->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 pr_err("%s Logical Unit Number: %u is not free on"
1429 " Target Portal Group: %hu, ignoring request.\n",
1430 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1431 tpg->se_tpg_tfo->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 pr_err("%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1451 "_TPG-1: %u for Target Portal Group: %hu\n",
1452 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1453 TRANSPORT_MAX_LUNS_PER_TPG-1,
1454 tpg->se_tpg_tfo->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 pr_err("%s Logical Unit Number: %u is not active on"
1462 " Target Portal Group: %hu, ignoring request.\n",
1463 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1464 tpg->se_tpg_tfo->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 pr_err("%s InitiatorName exceeds maximum size.\n",
1484 tpg->se_tpg_tfo->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 pr_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 pr_err("%s Logical Unit Number: %u is not active on"
1520 " Target Portal Group: %hu, ignoring request.\n",
1521 tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
1522 tpg->se_tpg_tfo->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 pr_debug("%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1547 " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
1548 tpg->se_tpg_tfo->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 pr_debug("%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1586 " InitiatorNode: %s Mapped LUN: %u\n",
1587 tpg->se_tpg_tfo->get_fabric_name(),
1588 tpg->se_tpg_tfo->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 pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1599 " Mapped LUN: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
1600 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1601 tpg->se_tpg_tfo->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_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1617 if (IS_ERR(hba))
1618 return PTR_ERR(hba);
1619
1620 lun0_hba = hba;
1621 t = hba->transport;
1622
1623 se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1624 if (!se_dev) {
1625 pr_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->t10_wwn.t10_vpd_list);
1631 spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1632 INIT_LIST_HEAD(&se_dev->t10_pr.registration_list);
1633 INIT_LIST_HEAD(&se_dev->t10_pr.aptpl_reg_list);
1634 spin_lock_init(&se_dev->t10_pr.registration_lock);
1635 spin_lock_init(&se_dev->t10_pr.aptpl_reg_lock);
1636 INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1637 spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1638 spin_lock_init(&se_dev->se_dev_lock);
1639 se_dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1640 se_dev->t10_wwn.t10_sub_dev = se_dev;
1641 se_dev->t10_alua.t10_sub_dev = se_dev;
1642 se_dev->se_dev_attrib.da_sub_dev = se_dev;
1643 se_dev->se_dev_hba = hba;
1644
1645 se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1646 if (!se_dev->se_dev_su_ptr) {
1647 pr_err("Unable to locate subsystem dependent pointer"
1648 " from allocate_virtdevice()\n");
1649 ret = -ENOMEM;
1650 goto out;
1651 }
1652 lun0_su_dev = se_dev;
1653
1654 memset(buf, 0, 16);
1655 sprintf(buf, "rd_pages=8");
1656 t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1657
1658 dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1659 if (IS_ERR(dev)) {
1660 ret = PTR_ERR(dev);
1661 goto out;
1662 }
1663 se_dev->se_dev_ptr = dev;
1664 g_lun0_dev = dev;
1665
1666 return 0;
1667 out:
1668 lun0_su_dev = NULL;
1669 kfree(se_dev);
1670 if (lun0_hba) {
1671 core_delete_hba(lun0_hba);
1672 lun0_hba = NULL;
1673 }
1674 return ret;
1675 }
1676
1677
1678 void core_dev_release_virtual_lun0(void)
1679 {
1680 struct se_hba *hba = lun0_hba;
1681 struct se_subsystem_dev *su_dev = lun0_su_dev;
1682
1683 if (!hba)
1684 return;
1685
1686 if (g_lun0_dev)
1687 se_free_virtual_device(g_lun0_dev, hba);
1688
1689 kfree(su_dev);
1690 core_delete_hba(hba);
1691 }
Linux kernel - Deliverables
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