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affs: remove unnecessary dentry_unhash on rmdir, dir rename
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / target / target_core_device.c
blobd25e20829012d61075ee470bf3fe5690ebd3afbe
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 explicitly concerted to MappedLUNs ->
375 * struct se_lun_acl, but we remove deve->alua_port_list from
376 * port->sep_alua_list. This also means that active UAs and
377 * NodeACL context specific PR metadata for demo-mode
378 * MappedLUN *deve will be released below..
379 */
380 spin_lock_bh(&port->sep_alua_lock);
381 list_del(&deve->alua_port_list);
382 spin_unlock_bh(&port->sep_alua_lock);
383 }
384
385 spin_lock_irq(&nacl->device_list_lock);
386 if (enable) {
387 /*
388 * Check if the call is handling demo mode -> explict LUN ACL
389 * transition. This transition must be for the same struct se_lun
390 * + mapped_lun that was setup in demo mode..
391 */
392 if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
393 if (deve->se_lun_acl != NULL) {
394 printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
395 " already set for demo mode -> explict"
396 " LUN ACL transition\n");
397 spin_unlock_irq(&nacl->device_list_lock);
398 return -1;
399 }
400 if (deve->se_lun != lun) {
401 printk(KERN_ERR "struct se_dev_entry->se_lun does"
402 " match passed struct se_lun for demo mode"
403 " -> explict LUN ACL transition\n");
404 spin_unlock_irq(&nacl->device_list_lock);
405 return -1;
406 }
407 deve->se_lun_acl = lun_acl;
408 trans = 1;
409 } else {
410 deve->se_lun = lun;
411 deve->se_lun_acl = lun_acl;
412 deve->mapped_lun = mapped_lun;
413 deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
414 }
415
416 if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
417 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
418 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
419 } else {
420 deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
421 deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
422 }
423
424 if (trans) {
425 spin_unlock_irq(&nacl->device_list_lock);
426 return 0;
427 }
428 deve->creation_time = get_jiffies_64();
429 deve->attach_count++;
430 spin_unlock_irq(&nacl->device_list_lock);
431
432 spin_lock_bh(&port->sep_alua_lock);
433 list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
434 spin_unlock_bh(&port->sep_alua_lock);
435
436 return 0;
437 }
438 /*
439 * Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
440 * PR operation to complete.
441 */
442 spin_unlock_irq(&nacl->device_list_lock);
443 while (atomic_read(&deve->pr_ref_count) != 0)
444 cpu_relax();
445 spin_lock_irq(&nacl->device_list_lock);
446 /*
447 * Disable struct se_dev_entry LUN ACL mapping
448 */
449 core_scsi3_ua_release_all(deve);
450 deve->se_lun = NULL;
451 deve->se_lun_acl = NULL;
452 deve->lun_flags = 0;
453 deve->creation_time = 0;
454 deve->attach_count--;
455 spin_unlock_irq(&nacl->device_list_lock);
456
457 core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
458 return 0;
459 }
460
461 /* core_clear_lun_from_tpg():
462 *
463 *
464 */
465 void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
466 {
467 struct se_node_acl *nacl;
468 struct se_dev_entry *deve;
469 u32 i;
470
471 spin_lock_bh(&tpg->acl_node_lock);
472 list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
473 spin_unlock_bh(&tpg->acl_node_lock);
474
475 spin_lock_irq(&nacl->device_list_lock);
476 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
477 deve = &nacl->device_list[i];
478 if (lun != deve->se_lun)
479 continue;
480 spin_unlock_irq(&nacl->device_list_lock);
481
482 core_update_device_list_for_node(lun, NULL,
483 deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
484 nacl, tpg, 0);
485
486 spin_lock_irq(&nacl->device_list_lock);
487 }
488 spin_unlock_irq(&nacl->device_list_lock);
489
490 spin_lock_bh(&tpg->acl_node_lock);
491 }
492 spin_unlock_bh(&tpg->acl_node_lock);
493
494 return;
495 }
496
497 static struct se_port *core_alloc_port(struct se_device *dev)
498 {
499 struct se_port *port, *port_tmp;
500
501 port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
502 if (!(port)) {
503 printk(KERN_ERR "Unable to allocate struct se_port\n");
504 return NULL;
505 }
506 INIT_LIST_HEAD(&port->sep_alua_list);
507 INIT_LIST_HEAD(&port->sep_list);
508 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
509 spin_lock_init(&port->sep_alua_lock);
510 mutex_init(&port->sep_tg_pt_md_mutex);
511
512 spin_lock(&dev->se_port_lock);
513 if (dev->dev_port_count == 0x0000ffff) {
514 printk(KERN_WARNING "Reached dev->dev_port_count =="
515 " 0x0000ffff\n");
516 spin_unlock(&dev->se_port_lock);
517 return NULL;
518 }
519 again:
520 /*
521 * Allocate the next RELATIVE TARGET PORT IDENTIFER for this struct se_device
522 * Here is the table from spc4r17 section 7.7.3.8.
523 *
524 * Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
525 *
526 * Code Description
527 * 0h Reserved
528 * 1h Relative port 1, historically known as port A
529 * 2h Relative port 2, historically known as port B
530 * 3h to FFFFh Relative port 3 through 65 535
531 */
532 port->sep_rtpi = dev->dev_rpti_counter++;
533 if (!(port->sep_rtpi))
534 goto again;
535
536 list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
537 /*
538 * Make sure RELATIVE TARGET PORT IDENTIFER is unique
539 * for 16-bit wrap..
540 */
541 if (port->sep_rtpi == port_tmp->sep_rtpi)
542 goto again;
543 }
544 spin_unlock(&dev->se_port_lock);
545
546 return port;
547 }
548
549 static void core_export_port(
550 struct se_device *dev,
551 struct se_portal_group *tpg,
552 struct se_port *port,
553 struct se_lun *lun)
554 {
555 struct se_subsystem_dev *su_dev = SU_DEV(dev);
556 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
557
558 spin_lock(&dev->se_port_lock);
559 spin_lock(&lun->lun_sep_lock);
560 port->sep_tpg = tpg;
561 port->sep_lun = lun;
562 lun->lun_sep = port;
563 spin_unlock(&lun->lun_sep_lock);
564
565 list_add_tail(&port->sep_list, &dev->dev_sep_list);
566 spin_unlock(&dev->se_port_lock);
567
568 if (T10_ALUA(su_dev)->alua_type == SPC3_ALUA_EMULATED) {
569 tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
570 if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
571 printk(KERN_ERR "Unable to allocate t10_alua_tg_pt"
572 "_gp_member_t\n");
573 return;
574 }
575 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
576 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
577 T10_ALUA(su_dev)->default_tg_pt_gp);
578 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
579 printk(KERN_INFO "%s/%s: Adding to default ALUA Target Port"
580 " Group: alua/default_tg_pt_gp\n",
581 TRANSPORT(dev)->name, TPG_TFO(tpg)->get_fabric_name());
582 }
583
584 dev->dev_port_count++;
585 port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFER */
586 }
587
588 /*
589 * Called with struct se_device->se_port_lock spinlock held.
590 */
591 static void core_release_port(struct se_device *dev, struct se_port *port)
592 __releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
593 {
594 /*
595 * Wait for any port reference for PR ALL_TG_PT=1 operation
596 * to complete in __core_scsi3_alloc_registration()
597 */
598 spin_unlock(&dev->se_port_lock);
599 if (atomic_read(&port->sep_tg_pt_ref_cnt))
600 cpu_relax();
601 spin_lock(&dev->se_port_lock);
602
603 core_alua_free_tg_pt_gp_mem(port);
604
605 list_del(&port->sep_list);
606 dev->dev_port_count--;
607 kfree(port);
608
609 return;
610 }
611
612 int core_dev_export(
613 struct se_device *dev,
614 struct se_portal_group *tpg,
615 struct se_lun *lun)
616 {
617 struct se_port *port;
618
619 port = core_alloc_port(dev);
620 if (!(port))
621 return -1;
622
623 lun->lun_se_dev = dev;
624 se_dev_start(dev);
625
626 atomic_inc(&dev->dev_export_obj.obj_access_count);
627 core_export_port(dev, tpg, port, lun);
628 return 0;
629 }
630
631 void core_dev_unexport(
632 struct se_device *dev,
633 struct se_portal_group *tpg,
634 struct se_lun *lun)
635 {
636 struct se_port *port = lun->lun_sep;
637
638 spin_lock(&lun->lun_sep_lock);
639 if (lun->lun_se_dev == NULL) {
640 spin_unlock(&lun->lun_sep_lock);
641 return;
642 }
643 spin_unlock(&lun->lun_sep_lock);
644
645 spin_lock(&dev->se_port_lock);
646 atomic_dec(&dev->dev_export_obj.obj_access_count);
647 core_release_port(dev, port);
648 spin_unlock(&dev->se_port_lock);
649
650 se_dev_stop(dev);
651 lun->lun_se_dev = NULL;
652 }
653
654 int transport_core_report_lun_response(struct se_cmd *se_cmd)
655 {
656 struct se_dev_entry *deve;
657 struct se_lun *se_lun;
658 struct se_session *se_sess = SE_SESS(se_cmd);
659 struct se_task *se_task;
660 unsigned char *buf = (unsigned char *)T_TASK(se_cmd)->t_task_buf;
661 u32 cdb_offset = 0, lun_count = 0, offset = 8;
662 u64 i, lun;
663
664 list_for_each_entry(se_task, &T_TASK(se_cmd)->t_task_list, t_list)
665 break;
666
667 if (!(se_task)) {
668 printk(KERN_ERR "Unable to locate struct se_task for struct se_cmd\n");
669 return PYX_TRANSPORT_LU_COMM_FAILURE;
670 }
671
672 /*
673 * If no struct se_session pointer is present, this struct se_cmd is
674 * coming via a target_core_mod PASSTHROUGH op, and not through
675 * a $FABRIC_MOD. In that case, report LUN=0 only.
676 */
677 if (!(se_sess)) {
678 lun = 0;
679 buf[offset++] = ((lun >> 56) & 0xff);
680 buf[offset++] = ((lun >> 48) & 0xff);
681 buf[offset++] = ((lun >> 40) & 0xff);
682 buf[offset++] = ((lun >> 32) & 0xff);
683 buf[offset++] = ((lun >> 24) & 0xff);
684 buf[offset++] = ((lun >> 16) & 0xff);
685 buf[offset++] = ((lun >> 8) & 0xff);
686 buf[offset++] = (lun & 0xff);
687 lun_count = 1;
688 goto done;
689 }
690
691 spin_lock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
692 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
693 deve = &SE_NODE_ACL(se_sess)->device_list[i];
694 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
695 continue;
696 se_lun = deve->se_lun;
697 /*
698 * We determine the correct LUN LIST LENGTH even once we
699 * have reached the initial allocation length.
700 * See SPC2-R20 7.19.
701 */
702 lun_count++;
703 if ((cdb_offset + 8) >= se_cmd->data_length)
704 continue;
705
706 lun = cpu_to_be64(CMD_TFO(se_cmd)->pack_lun(deve->mapped_lun));
707 buf[offset++] = ((lun >> 56) & 0xff);
708 buf[offset++] = ((lun >> 48) & 0xff);
709 buf[offset++] = ((lun >> 40) & 0xff);
710 buf[offset++] = ((lun >> 32) & 0xff);
711 buf[offset++] = ((lun >> 24) & 0xff);
712 buf[offset++] = ((lun >> 16) & 0xff);
713 buf[offset++] = ((lun >> 8) & 0xff);
714 buf[offset++] = (lun & 0xff);
715 cdb_offset += 8;
716 }
717 spin_unlock_irq(&SE_NODE_ACL(se_sess)->device_list_lock);
718
719 /*
720 * See SPC3 r07, page 159.
721 */
722 done:
723 lun_count *= 8;
724 buf[0] = ((lun_count >> 24) & 0xff);
725 buf[1] = ((lun_count >> 16) & 0xff);
726 buf[2] = ((lun_count >> 8) & 0xff);
727 buf[3] = (lun_count & 0xff);
728
729 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
730 }
731
732 /* se_release_device_for_hba():
733 *
734 *
735 */
736 void se_release_device_for_hba(struct se_device *dev)
737 {
738 struct se_hba *hba = dev->se_hba;
739
740 if ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
741 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) ||
742 (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) ||
743 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_ACTIVATED) ||
744 (dev->dev_status & TRANSPORT_DEVICE_OFFLINE_DEACTIVATED))
745 se_dev_stop(dev);
746
747 if (dev->dev_ptr) {
748 kthread_stop(dev->process_thread);
749 if (dev->transport->free_device)
750 dev->transport->free_device(dev->dev_ptr);
751 }
752
753 spin_lock(&hba->device_lock);
754 list_del(&dev->dev_list);
755 hba->dev_count--;
756 spin_unlock(&hba->device_lock);
757
758 core_scsi3_free_all_registrations(dev);
759 se_release_vpd_for_dev(dev);
760
761 kfree(dev->dev_status_queue_obj);
762 kfree(dev->dev_queue_obj);
763 kfree(dev);
764
765 return;
766 }
767
768 void se_release_vpd_for_dev(struct se_device *dev)
769 {
770 struct t10_vpd *vpd, *vpd_tmp;
771
772 spin_lock(&DEV_T10_WWN(dev)->t10_vpd_lock);
773 list_for_each_entry_safe(vpd, vpd_tmp,
774 &DEV_T10_WWN(dev)->t10_vpd_list, vpd_list) {
775 list_del(&vpd->vpd_list);
776 kfree(vpd);
777 }
778 spin_unlock(&DEV_T10_WWN(dev)->t10_vpd_lock);
779
780 return;
781 }
782
783 /* se_free_virtual_device():
784 *
785 * Used for IBLOCK, RAMDISK, and FILEIO Transport Drivers.
786 */
787 int se_free_virtual_device(struct se_device *dev, struct se_hba *hba)
788 {
789 if (!list_empty(&dev->dev_sep_list))
790 dump_stack();
791
792 core_alua_free_lu_gp_mem(dev);
793 se_release_device_for_hba(dev);
794
795 return 0;
796 }
797
798 static void se_dev_start(struct se_device *dev)
799 {
800 struct se_hba *hba = dev->se_hba;
801
802 spin_lock(&hba->device_lock);
803 atomic_inc(&dev->dev_obj.obj_access_count);
804 if (atomic_read(&dev->dev_obj.obj_access_count) == 1) {
805 if (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED) {
806 dev->dev_status &= ~TRANSPORT_DEVICE_DEACTIVATED;
807 dev->dev_status |= TRANSPORT_DEVICE_ACTIVATED;
808 } else if (dev->dev_status &
809 TRANSPORT_DEVICE_OFFLINE_DEACTIVATED) {
810 dev->dev_status &=
811 ~TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
812 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
813 }
814 }
815 spin_unlock(&hba->device_lock);
816 }
817
818 static void se_dev_stop(struct se_device *dev)
819 {
820 struct se_hba *hba = dev->se_hba;
821
822 spin_lock(&hba->device_lock);
823 atomic_dec(&dev->dev_obj.obj_access_count);
824 if (atomic_read(&dev->dev_obj.obj_access_count) == 0) {
825 if (dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) {
826 dev->dev_status &= ~TRANSPORT_DEVICE_ACTIVATED;
827 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
828 } else if (dev->dev_status &
829 TRANSPORT_DEVICE_OFFLINE_ACTIVATED) {
830 dev->dev_status &= ~TRANSPORT_DEVICE_OFFLINE_ACTIVATED;
831 dev->dev_status |= TRANSPORT_DEVICE_OFFLINE_DEACTIVATED;
832 }
833 }
834 spin_unlock(&hba->device_lock);
835 }
836
837 int se_dev_check_online(struct se_device *dev)
838 {
839 int ret;
840
841 spin_lock_irq(&dev->dev_status_lock);
842 ret = ((dev->dev_status & TRANSPORT_DEVICE_ACTIVATED) ||
843 (dev->dev_status & TRANSPORT_DEVICE_DEACTIVATED)) ? 0 : 1;
844 spin_unlock_irq(&dev->dev_status_lock);
845
846 return ret;
847 }
848
849 int se_dev_check_shutdown(struct se_device *dev)
850 {
851 int ret;
852
853 spin_lock_irq(&dev->dev_status_lock);
854 ret = (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN);
855 spin_unlock_irq(&dev->dev_status_lock);
856
857 return ret;
858 }
859
860 void se_dev_set_default_attribs(
861 struct se_device *dev,
862 struct se_dev_limits *dev_limits)
863 {
864 struct queue_limits *limits = &dev_limits->limits;
865
866 DEV_ATTRIB(dev)->emulate_dpo = DA_EMULATE_DPO;
867 DEV_ATTRIB(dev)->emulate_fua_write = DA_EMULATE_FUA_WRITE;
868 DEV_ATTRIB(dev)->emulate_fua_read = DA_EMULATE_FUA_READ;
869 DEV_ATTRIB(dev)->emulate_write_cache = DA_EMULATE_WRITE_CACHE;
870 DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
871 DEV_ATTRIB(dev)->emulate_tas = DA_EMULATE_TAS;
872 DEV_ATTRIB(dev)->emulate_tpu = DA_EMULATE_TPU;
873 DEV_ATTRIB(dev)->emulate_tpws = DA_EMULATE_TPWS;
874 DEV_ATTRIB(dev)->emulate_reservations = DA_EMULATE_RESERVATIONS;
875 DEV_ATTRIB(dev)->emulate_alua = DA_EMULATE_ALUA;
876 DEV_ATTRIB(dev)->enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
877 /*
878 * The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
879 * iblock_create_virtdevice() from struct queue_limits values
880 * if blk_queue_discard()==1
881 */
882 DEV_ATTRIB(dev)->max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
883 DEV_ATTRIB(dev)->max_unmap_block_desc_count =
884 DA_MAX_UNMAP_BLOCK_DESC_COUNT;
885 DEV_ATTRIB(dev)->unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
886 DEV_ATTRIB(dev)->unmap_granularity_alignment =
887 DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
888 /*
889 * block_size is based on subsystem plugin dependent requirements.
890 */
891 DEV_ATTRIB(dev)->hw_block_size = limits->logical_block_size;
892 DEV_ATTRIB(dev)->block_size = limits->logical_block_size;
893 /*
894 * max_sectors is based on subsystem plugin dependent requirements.
895 */
896 DEV_ATTRIB(dev)->hw_max_sectors = limits->max_hw_sectors;
897 DEV_ATTRIB(dev)->max_sectors = limits->max_sectors;
898 /*
899 * Set optimal_sectors from max_sectors, which can be lowered via
900 * configfs.
901 */
902 DEV_ATTRIB(dev)->optimal_sectors = limits->max_sectors;
903 /*
904 * queue_depth is based on subsystem plugin dependent requirements.
905 */
906 DEV_ATTRIB(dev)->hw_queue_depth = dev_limits->hw_queue_depth;
907 DEV_ATTRIB(dev)->queue_depth = dev_limits->queue_depth;
908 }
909
910 int se_dev_set_task_timeout(struct se_device *dev, u32 task_timeout)
911 {
912 if (task_timeout > DA_TASK_TIMEOUT_MAX) {
913 printk(KERN_ERR "dev[%p]: Passed task_timeout: %u larger then"
914 " DA_TASK_TIMEOUT_MAX\n", dev, task_timeout);
915 return -1;
916 } else {
917 DEV_ATTRIB(dev)->task_timeout = task_timeout;
918 printk(KERN_INFO "dev[%p]: Set SE Device task_timeout: %u\n",
919 dev, task_timeout);
920 }
921
922 return 0;
923 }
924
925 int se_dev_set_max_unmap_lba_count(
926 struct se_device *dev,
927 u32 max_unmap_lba_count)
928 {
929 DEV_ATTRIB(dev)->max_unmap_lba_count = max_unmap_lba_count;
930 printk(KERN_INFO "dev[%p]: Set max_unmap_lba_count: %u\n",
931 dev, DEV_ATTRIB(dev)->max_unmap_lba_count);
932 return 0;
933 }
934
935 int se_dev_set_max_unmap_block_desc_count(
936 struct se_device *dev,
937 u32 max_unmap_block_desc_count)
938 {
939 DEV_ATTRIB(dev)->max_unmap_block_desc_count = max_unmap_block_desc_count;
940 printk(KERN_INFO "dev[%p]: Set max_unmap_block_desc_count: %u\n",
941 dev, DEV_ATTRIB(dev)->max_unmap_block_desc_count);
942 return 0;
943 }
944
945 int se_dev_set_unmap_granularity(
946 struct se_device *dev,
947 u32 unmap_granularity)
948 {
949 DEV_ATTRIB(dev)->unmap_granularity = unmap_granularity;
950 printk(KERN_INFO "dev[%p]: Set unmap_granularity: %u\n",
951 dev, DEV_ATTRIB(dev)->unmap_granularity);
952 return 0;
953 }
954
955 int se_dev_set_unmap_granularity_alignment(
956 struct se_device *dev,
957 u32 unmap_granularity_alignment)
958 {
959 DEV_ATTRIB(dev)->unmap_granularity_alignment = unmap_granularity_alignment;
960 printk(KERN_INFO "dev[%p]: Set unmap_granularity_alignment: %u\n",
961 dev, DEV_ATTRIB(dev)->unmap_granularity_alignment);
962 return 0;
963 }
964
965 int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
966 {
967 if ((flag != 0) && (flag != 1)) {
968 printk(KERN_ERR "Illegal value %d\n", flag);
969 return -1;
970 }
971 if (TRANSPORT(dev)->dpo_emulated == NULL) {
972 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated is NULL\n");
973 return -1;
974 }
975 if (TRANSPORT(dev)->dpo_emulated(dev) == 0) {
976 printk(KERN_ERR "TRANSPORT(dev)->dpo_emulated not supported\n");
977 return -1;
978 }
979 DEV_ATTRIB(dev)->emulate_dpo = flag;
980 printk(KERN_INFO "dev[%p]: SE Device Page Out (DPO) Emulation"
981 " bit: %d\n", dev, DEV_ATTRIB(dev)->emulate_dpo);
982 return 0;
983 }
984
985 int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
986 {
987 if ((flag != 0) && (flag != 1)) {
988 printk(KERN_ERR "Illegal value %d\n", flag);
989 return -1;
990 }
991 if (TRANSPORT(dev)->fua_write_emulated == NULL) {
992 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated is NULL\n");
993 return -1;
994 }
995 if (TRANSPORT(dev)->fua_write_emulated(dev) == 0) {
996 printk(KERN_ERR "TRANSPORT(dev)->fua_write_emulated not supported\n");
997 return -1;
998 }
999 DEV_ATTRIB(dev)->emulate_fua_write = flag;
1000 printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
1001 dev, DEV_ATTRIB(dev)->emulate_fua_write);
1002 return 0;
1003 }
1004
1005 int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
1006 {
1007 if ((flag != 0) && (flag != 1)) {
1008 printk(KERN_ERR "Illegal value %d\n", flag);
1009 return -1;
1010 }
1011 if (TRANSPORT(dev)->fua_read_emulated == NULL) {
1012 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated is NULL\n");
1013 return -1;
1014 }
1015 if (TRANSPORT(dev)->fua_read_emulated(dev) == 0) {
1016 printk(KERN_ERR "TRANSPORT(dev)->fua_read_emulated not supported\n");
1017 return -1;
1018 }
1019 DEV_ATTRIB(dev)->emulate_fua_read = flag;
1020 printk(KERN_INFO "dev[%p]: SE Device Forced Unit Access READs: %d\n",
1021 dev, DEV_ATTRIB(dev)->emulate_fua_read);
1022 return 0;
1023 }
1024
1025 int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
1026 {
1027 if ((flag != 0) && (flag != 1)) {
1028 printk(KERN_ERR "Illegal value %d\n", flag);
1029 return -1;
1030 }
1031 if (TRANSPORT(dev)->write_cache_emulated == NULL) {
1032 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated is NULL\n");
1033 return -1;
1034 }
1035 if (TRANSPORT(dev)->write_cache_emulated(dev) == 0) {
1036 printk(KERN_ERR "TRANSPORT(dev)->write_cache_emulated not supported\n");
1037 return -1;
1038 }
1039 DEV_ATTRIB(dev)->emulate_write_cache = flag;
1040 printk(KERN_INFO "dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
1041 dev, DEV_ATTRIB(dev)->emulate_write_cache);
1042 return 0;
1043 }
1044
1045 int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
1046 {
1047 if ((flag != 0) && (flag != 1) && (flag != 2)) {
1048 printk(KERN_ERR "Illegal value %d\n", flag);
1049 return -1;
1050 }
1051
1052 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1053 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1054 " UA_INTRLCK_CTRL while dev_export_obj: %d count"
1055 " exists\n", dev,
1056 atomic_read(&dev->dev_export_obj.obj_access_count));
1057 return -1;
1058 }
1059 DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl = flag;
1060 printk(KERN_INFO "dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
1061 dev, DEV_ATTRIB(dev)->emulate_ua_intlck_ctrl);
1062
1063 return 0;
1064 }
1065
1066 int se_dev_set_emulate_tas(struct se_device *dev, int flag)
1067 {
1068 if ((flag != 0) && (flag != 1)) {
1069 printk(KERN_ERR "Illegal value %d\n", flag);
1070 return -1;
1071 }
1072
1073 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1074 printk(KERN_ERR "dev[%p]: Unable to change SE Device TAS while"
1075 " dev_export_obj: %d count exists\n", dev,
1076 atomic_read(&dev->dev_export_obj.obj_access_count));
1077 return -1;
1078 }
1079 DEV_ATTRIB(dev)->emulate_tas = flag;
1080 printk(KERN_INFO "dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
1081 dev, (DEV_ATTRIB(dev)->emulate_tas) ? "Enabled" : "Disabled");
1082
1083 return 0;
1084 }
1085
1086 int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
1087 {
1088 if ((flag != 0) && (flag != 1)) {
1089 printk(KERN_ERR "Illegal value %d\n", flag);
1090 return -1;
1091 }
1092 /*
1093 * We expect this value to be non-zero when generic Block Layer
1094 * Discard supported is detected iblock_create_virtdevice().
1095 */
1096 if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1097 printk(KERN_ERR "Generic Block Discard not supported\n");
1098 return -ENOSYS;
1099 }
1100
1101 DEV_ATTRIB(dev)->emulate_tpu = flag;
1102 printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
1103 dev, flag);
1104 return 0;
1105 }
1106
1107 int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
1108 {
1109 if ((flag != 0) && (flag != 1)) {
1110 printk(KERN_ERR "Illegal value %d\n", flag);
1111 return -1;
1112 }
1113 /*
1114 * We expect this value to be non-zero when generic Block Layer
1115 * Discard supported is detected iblock_create_virtdevice().
1116 */
1117 if (!(DEV_ATTRIB(dev)->max_unmap_block_desc_count)) {
1118 printk(KERN_ERR "Generic Block Discard not supported\n");
1119 return -ENOSYS;
1120 }
1121
1122 DEV_ATTRIB(dev)->emulate_tpws = flag;
1123 printk(KERN_INFO "dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
1124 dev, flag);
1125 return 0;
1126 }
1127
1128 int se_dev_set_enforce_pr_isids(struct se_device *dev, int flag)
1129 {
1130 if ((flag != 0) && (flag != 1)) {
1131 printk(KERN_ERR "Illegal value %d\n", flag);
1132 return -1;
1133 }
1134 DEV_ATTRIB(dev)->enforce_pr_isids = flag;
1135 printk(KERN_INFO "dev[%p]: SE Device enforce_pr_isids bit: %s\n", dev,
1136 (DEV_ATTRIB(dev)->enforce_pr_isids) ? "Enabled" : "Disabled");
1137 return 0;
1138 }
1139
1140 /*
1141 * Note, this can only be called on unexported SE Device Object.
1142 */
1143 int se_dev_set_queue_depth(struct se_device *dev, u32 queue_depth)
1144 {
1145 u32 orig_queue_depth = dev->queue_depth;
1146
1147 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1148 printk(KERN_ERR "dev[%p]: Unable to change SE Device TCQ while"
1149 " dev_export_obj: %d count exists\n", dev,
1150 atomic_read(&dev->dev_export_obj.obj_access_count));
1151 return -1;
1152 }
1153 if (!(queue_depth)) {
1154 printk(KERN_ERR "dev[%p]: Illegal ZERO value for queue"
1155 "_depth\n", dev);
1156 return -1;
1157 }
1158
1159 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1160 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1161 printk(KERN_ERR "dev[%p]: Passed queue_depth: %u"
1162 " exceeds TCM/SE_Device TCQ: %u\n",
1163 dev, queue_depth,
1164 DEV_ATTRIB(dev)->hw_queue_depth);
1165 return -1;
1166 }
1167 } else {
1168 if (queue_depth > DEV_ATTRIB(dev)->queue_depth) {
1169 if (queue_depth > DEV_ATTRIB(dev)->hw_queue_depth) {
1170 printk(KERN_ERR "dev[%p]: Passed queue_depth:"
1171 " %u exceeds TCM/SE_Device MAX"
1172 " TCQ: %u\n", dev, queue_depth,
1173 DEV_ATTRIB(dev)->hw_queue_depth);
1174 return -1;
1175 }
1176 }
1177 }
1178
1179 DEV_ATTRIB(dev)->queue_depth = dev->queue_depth = queue_depth;
1180 if (queue_depth > orig_queue_depth)
1181 atomic_add(queue_depth - orig_queue_depth, &dev->depth_left);
1182 else if (queue_depth < orig_queue_depth)
1183 atomic_sub(orig_queue_depth - queue_depth, &dev->depth_left);
1184
1185 printk(KERN_INFO "dev[%p]: SE Device TCQ Depth changed to: %u\n",
1186 dev, queue_depth);
1187 return 0;
1188 }
1189
1190 int se_dev_set_max_sectors(struct se_device *dev, u32 max_sectors)
1191 {
1192 int force = 0; /* Force setting for VDEVS */
1193
1194 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1195 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1196 " max_sectors while dev_export_obj: %d count exists\n",
1197 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1198 return -1;
1199 }
1200 if (!(max_sectors)) {
1201 printk(KERN_ERR "dev[%p]: Illegal ZERO value for"
1202 " max_sectors\n", dev);
1203 return -1;
1204 }
1205 if (max_sectors < DA_STATUS_MAX_SECTORS_MIN) {
1206 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u less than"
1207 " DA_STATUS_MAX_SECTORS_MIN: %u\n", dev, max_sectors,
1208 DA_STATUS_MAX_SECTORS_MIN);
1209 return -1;
1210 }
1211 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1212 if (max_sectors > DEV_ATTRIB(dev)->hw_max_sectors) {
1213 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1214 " greater than TCM/SE_Device max_sectors:"
1215 " %u\n", dev, max_sectors,
1216 DEV_ATTRIB(dev)->hw_max_sectors);
1217 return -1;
1218 }
1219 } else {
1220 if (!(force) && (max_sectors >
1221 DEV_ATTRIB(dev)->hw_max_sectors)) {
1222 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1223 " greater than TCM/SE_Device max_sectors"
1224 ": %u, use force=1 to override.\n", dev,
1225 max_sectors, DEV_ATTRIB(dev)->hw_max_sectors);
1226 return -1;
1227 }
1228 if (max_sectors > DA_STATUS_MAX_SECTORS_MAX) {
1229 printk(KERN_ERR "dev[%p]: Passed max_sectors: %u"
1230 " greater than DA_STATUS_MAX_SECTORS_MAX:"
1231 " %u\n", dev, max_sectors,
1232 DA_STATUS_MAX_SECTORS_MAX);
1233 return -1;
1234 }
1235 }
1236
1237 DEV_ATTRIB(dev)->max_sectors = max_sectors;
1238 printk("dev[%p]: SE Device max_sectors changed to %u\n",
1239 dev, max_sectors);
1240 return 0;
1241 }
1242
1243 int se_dev_set_optimal_sectors(struct se_device *dev, u32 optimal_sectors)
1244 {
1245 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1246 printk(KERN_ERR "dev[%p]: Unable to change SE Device"
1247 " optimal_sectors while dev_export_obj: %d count exists\n",
1248 dev, atomic_read(&dev->dev_export_obj.obj_access_count));
1249 return -EINVAL;
1250 }
1251 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1252 printk(KERN_ERR "dev[%p]: Passed optimal_sectors cannot be"
1253 " changed for TCM/pSCSI\n", dev);
1254 return -EINVAL;
1255 }
1256 if (optimal_sectors > DEV_ATTRIB(dev)->max_sectors) {
1257 printk(KERN_ERR "dev[%p]: Passed optimal_sectors %u cannot be"
1258 " greater than max_sectors: %u\n", dev,
1259 optimal_sectors, DEV_ATTRIB(dev)->max_sectors);
1260 return -EINVAL;
1261 }
1262
1263 DEV_ATTRIB(dev)->optimal_sectors = optimal_sectors;
1264 printk(KERN_INFO "dev[%p]: SE Device optimal_sectors changed to %u\n",
1265 dev, optimal_sectors);
1266 return 0;
1267 }
1268
1269 int se_dev_set_block_size(struct se_device *dev, u32 block_size)
1270 {
1271 if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
1272 printk(KERN_ERR "dev[%p]: Unable to change SE Device block_size"
1273 " while dev_export_obj: %d count exists\n", dev,
1274 atomic_read(&dev->dev_export_obj.obj_access_count));
1275 return -1;
1276 }
1277
1278 if ((block_size != 512) &&
1279 (block_size != 1024) &&
1280 (block_size != 2048) &&
1281 (block_size != 4096)) {
1282 printk(KERN_ERR "dev[%p]: Illegal value for block_device: %u"
1283 " for SE device, must be 512, 1024, 2048 or 4096\n",
1284 dev, block_size);
1285 return -1;
1286 }
1287
1288 if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1289 printk(KERN_ERR "dev[%p]: Not allowed to change block_size for"
1290 " Physical Device, use for Linux/SCSI to change"
1291 " block_size for underlying hardware\n", dev);
1292 return -1;
1293 }
1294
1295 DEV_ATTRIB(dev)->block_size = block_size;
1296 printk(KERN_INFO "dev[%p]: SE Device block_size changed to %u\n",
1297 dev, block_size);
1298 return 0;
1299 }
1300
1301 struct se_lun *core_dev_add_lun(
1302 struct se_portal_group *tpg,
1303 struct se_hba *hba,
1304 struct se_device *dev,
1305 u32 lun)
1306 {
1307 struct se_lun *lun_p;
1308 u32 lun_access = 0;
1309
1310 if (atomic_read(&dev->dev_access_obj.obj_access_count) != 0) {
1311 printk(KERN_ERR "Unable to export struct se_device while dev_access_obj: %d\n",
1312 atomic_read(&dev->dev_access_obj.obj_access_count));
1313 return NULL;
1314 }
1315
1316 lun_p = core_tpg_pre_addlun(tpg, lun);
1317 if ((IS_ERR(lun_p)) || !(lun_p))
1318 return NULL;
1319
1320 if (dev->dev_flags & DF_READ_ONLY)
1321 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1322 else
1323 lun_access = TRANSPORT_LUNFLAGS_READ_WRITE;
1324
1325 if (core_tpg_post_addlun(tpg, lun_p, lun_access, dev) < 0)
1326 return NULL;
1327
1328 printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Activated %s Logical Unit from"
1329 " CORE HBA: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1330 TPG_TFO(tpg)->tpg_get_tag(tpg), lun_p->unpacked_lun,
1331 TPG_TFO(tpg)->get_fabric_name(), hba->hba_id);
1332 /*
1333 * Update LUN maps for dynamically added initiators when
1334 * generate_node_acl is enabled.
1335 */
1336 if (TPG_TFO(tpg)->tpg_check_demo_mode(tpg)) {
1337 struct se_node_acl *acl;
1338 spin_lock_bh(&tpg->acl_node_lock);
1339 list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
1340 if (acl->dynamic_node_acl) {
1341 spin_unlock_bh(&tpg->acl_node_lock);
1342 core_tpg_add_node_to_devs(acl, tpg);
1343 spin_lock_bh(&tpg->acl_node_lock);
1344 }
1345 }
1346 spin_unlock_bh(&tpg->acl_node_lock);
1347 }
1348
1349 return lun_p;
1350 }
1351
1352 /* core_dev_del_lun():
1353 *
1354 *
1355 */
1356 int core_dev_del_lun(
1357 struct se_portal_group *tpg,
1358 u32 unpacked_lun)
1359 {
1360 struct se_lun *lun;
1361 int ret = 0;
1362
1363 lun = core_tpg_pre_dellun(tpg, unpacked_lun, &ret);
1364 if (!(lun))
1365 return ret;
1366
1367 core_tpg_post_dellun(tpg, lun);
1368
1369 printk(KERN_INFO "%s_TPG[%u]_LUN[%u] - Deactivated %s Logical Unit from"
1370 " device object\n", TPG_TFO(tpg)->get_fabric_name(),
1371 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun,
1372 TPG_TFO(tpg)->get_fabric_name());
1373
1374 return 0;
1375 }
1376
1377 struct se_lun *core_get_lun_from_tpg(struct se_portal_group *tpg, u32 unpacked_lun)
1378 {
1379 struct se_lun *lun;
1380
1381 spin_lock(&tpg->tpg_lun_lock);
1382 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1383 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS"
1384 "_PER_TPG-1: %u for Target Portal Group: %hu\n",
1385 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1386 TRANSPORT_MAX_LUNS_PER_TPG-1,
1387 TPG_TFO(tpg)->tpg_get_tag(tpg));
1388 spin_unlock(&tpg->tpg_lun_lock);
1389 return NULL;
1390 }
1391 lun = &tpg->tpg_lun_list[unpacked_lun];
1392
1393 if (lun->lun_status != TRANSPORT_LUN_STATUS_FREE) {
1394 printk(KERN_ERR "%s Logical Unit Number: %u is not free on"
1395 " Target Portal Group: %hu, ignoring request.\n",
1396 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1397 TPG_TFO(tpg)->tpg_get_tag(tpg));
1398 spin_unlock(&tpg->tpg_lun_lock);
1399 return NULL;
1400 }
1401 spin_unlock(&tpg->tpg_lun_lock);
1402
1403 return lun;
1404 }
1405
1406 /* core_dev_get_lun():
1407 *
1408 *
1409 */
1410 static struct se_lun *core_dev_get_lun(struct se_portal_group *tpg, u32 unpacked_lun)
1411 {
1412 struct se_lun *lun;
1413
1414 spin_lock(&tpg->tpg_lun_lock);
1415 if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
1416 printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER"
1417 "_TPG-1: %u for Target Portal Group: %hu\n",
1418 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1419 TRANSPORT_MAX_LUNS_PER_TPG-1,
1420 TPG_TFO(tpg)->tpg_get_tag(tpg));
1421 spin_unlock(&tpg->tpg_lun_lock);
1422 return NULL;
1423 }
1424 lun = &tpg->tpg_lun_list[unpacked_lun];
1425
1426 if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) {
1427 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1428 " Target Portal Group: %hu, ignoring request.\n",
1429 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1430 TPG_TFO(tpg)->tpg_get_tag(tpg));
1431 spin_unlock(&tpg->tpg_lun_lock);
1432 return NULL;
1433 }
1434 spin_unlock(&tpg->tpg_lun_lock);
1435
1436 return lun;
1437 }
1438
1439 struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
1440 struct se_portal_group *tpg,
1441 u32 mapped_lun,
1442 char *initiatorname,
1443 int *ret)
1444 {
1445 struct se_lun_acl *lacl;
1446 struct se_node_acl *nacl;
1447
1448 if (strlen(initiatorname) > TRANSPORT_IQN_LEN) {
1449 printk(KERN_ERR "%s InitiatorName exceeds maximum size.\n",
1450 TPG_TFO(tpg)->get_fabric_name());
1451 *ret = -EOVERFLOW;
1452 return NULL;
1453 }
1454 nacl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
1455 if (!(nacl)) {
1456 *ret = -EINVAL;
1457 return NULL;
1458 }
1459 lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
1460 if (!(lacl)) {
1461 printk(KERN_ERR "Unable to allocate memory for struct se_lun_acl.\n");
1462 *ret = -ENOMEM;
1463 return NULL;
1464 }
1465
1466 INIT_LIST_HEAD(&lacl->lacl_list);
1467 lacl->mapped_lun = mapped_lun;
1468 lacl->se_lun_nacl = nacl;
1469 snprintf(lacl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
1470
1471 return lacl;
1472 }
1473
1474 int core_dev_add_initiator_node_lun_acl(
1475 struct se_portal_group *tpg,
1476 struct se_lun_acl *lacl,
1477 u32 unpacked_lun,
1478 u32 lun_access)
1479 {
1480 struct se_lun *lun;
1481 struct se_node_acl *nacl;
1482
1483 lun = core_dev_get_lun(tpg, unpacked_lun);
1484 if (!(lun)) {
1485 printk(KERN_ERR "%s Logical Unit Number: %u is not active on"
1486 " Target Portal Group: %hu, ignoring request.\n",
1487 TPG_TFO(tpg)->get_fabric_name(), unpacked_lun,
1488 TPG_TFO(tpg)->tpg_get_tag(tpg));
1489 return -EINVAL;
1490 }
1491
1492 nacl = lacl->se_lun_nacl;
1493 if (!(nacl))
1494 return -EINVAL;
1495
1496 if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
1497 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
1498 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
1499
1500 lacl->se_lun = lun;
1501
1502 if (core_update_device_list_for_node(lun, lacl, lacl->mapped_lun,
1503 lun_access, nacl, tpg, 1) < 0)
1504 return -EINVAL;
1505
1506 spin_lock(&lun->lun_acl_lock);
1507 list_add_tail(&lacl->lacl_list, &lun->lun_acl_list);
1508 atomic_inc(&lun->lun_acl_count);
1509 smp_mb__after_atomic_inc();
1510 spin_unlock(&lun->lun_acl_lock);
1511
1512 printk(KERN_INFO "%s_TPG[%hu]_LUN[%u->%u] - Added %s ACL for "
1513 " InitiatorNode: %s\n", TPG_TFO(tpg)->get_fabric_name(),
1514 TPG_TFO(tpg)->tpg_get_tag(tpg), unpacked_lun, lacl->mapped_lun,
1515 (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
1516 lacl->initiatorname);
1517 /*
1518 * Check to see if there are any existing persistent reservation APTPL
1519 * pre-registrations that need to be enabled for this LUN ACL..
1520 */
1521 core_scsi3_check_aptpl_registration(lun->lun_se_dev, tpg, lun, lacl);
1522 return 0;
1523 }
1524
1525 /* core_dev_del_initiator_node_lun_acl():
1526 *
1527 *
1528 */
1529 int core_dev_del_initiator_node_lun_acl(
1530 struct se_portal_group *tpg,
1531 struct se_lun *lun,
1532 struct se_lun_acl *lacl)
1533 {
1534 struct se_node_acl *nacl;
1535
1536 nacl = lacl->se_lun_nacl;
1537 if (!(nacl))
1538 return -EINVAL;
1539
1540 spin_lock(&lun->lun_acl_lock);
1541 list_del(&lacl->lacl_list);
1542 atomic_dec(&lun->lun_acl_count);
1543 smp_mb__after_atomic_dec();
1544 spin_unlock(&lun->lun_acl_lock);
1545
1546 core_update_device_list_for_node(lun, NULL, lacl->mapped_lun,
1547 TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0);
1548
1549 lacl->se_lun = NULL;
1550
1551 printk(KERN_INFO "%s_TPG[%hu]_LUN[%u] - Removed ACL for"
1552 " InitiatorNode: %s Mapped LUN: %u\n",
1553 TPG_TFO(tpg)->get_fabric_name(),
1554 TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun,
1555 lacl->initiatorname, lacl->mapped_lun);
1556
1557 return 0;
1558 }
1559
1560 void core_dev_free_initiator_node_lun_acl(
1561 struct se_portal_group *tpg,
1562 struct se_lun_acl *lacl)
1563 {
1564 printk("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
1565 " Mapped LUN: %u\n", TPG_TFO(tpg)->get_fabric_name(),
1566 TPG_TFO(tpg)->tpg_get_tag(tpg),
1567 TPG_TFO(tpg)->get_fabric_name(),
1568 lacl->initiatorname, lacl->mapped_lun);
1569
1570 kfree(lacl);
1571 }
1572
1573 int core_dev_setup_virtual_lun0(void)
1574 {
1575 struct se_hba *hba;
1576 struct se_device *dev;
1577 struct se_subsystem_dev *se_dev = NULL;
1578 struct se_subsystem_api *t;
1579 char buf[16];
1580 int ret;
1581
1582 hba = core_alloc_hba("rd_dr", 0, HBA_FLAGS_INTERNAL_USE);
1583 if (IS_ERR(hba))
1584 return PTR_ERR(hba);
1585
1586 se_global->g_lun0_hba = hba;
1587 t = hba->transport;
1588
1589 se_dev = kzalloc(sizeof(struct se_subsystem_dev), GFP_KERNEL);
1590 if (!(se_dev)) {
1591 printk(KERN_ERR "Unable to allocate memory for"
1592 " struct se_subsystem_dev\n");
1593 ret = -ENOMEM;
1594 goto out;
1595 }
1596 INIT_LIST_HEAD(&se_dev->g_se_dev_list);
1597 INIT_LIST_HEAD(&se_dev->t10_wwn.t10_vpd_list);
1598 spin_lock_init(&se_dev->t10_wwn.t10_vpd_lock);
1599 INIT_LIST_HEAD(&se_dev->t10_reservation.registration_list);
1600 INIT_LIST_HEAD(&se_dev->t10_reservation.aptpl_reg_list);
1601 spin_lock_init(&se_dev->t10_reservation.registration_lock);
1602 spin_lock_init(&se_dev->t10_reservation.aptpl_reg_lock);
1603 INIT_LIST_HEAD(&se_dev->t10_alua.tg_pt_gps_list);
1604 spin_lock_init(&se_dev->t10_alua.tg_pt_gps_lock);
1605 spin_lock_init(&se_dev->se_dev_lock);
1606 se_dev->t10_reservation.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
1607 se_dev->t10_wwn.t10_sub_dev = se_dev;
1608 se_dev->t10_alua.t10_sub_dev = se_dev;
1609 se_dev->se_dev_attrib.da_sub_dev = se_dev;
1610 se_dev->se_dev_hba = hba;
1611
1612 se_dev->se_dev_su_ptr = t->allocate_virtdevice(hba, "virt_lun0");
1613 if (!(se_dev->se_dev_su_ptr)) {
1614 printk(KERN_ERR "Unable to locate subsystem dependent pointer"
1615 " from allocate_virtdevice()\n");
1616 ret = -ENOMEM;
1617 goto out;
1618 }
1619 se_global->g_lun0_su_dev = se_dev;
1620
1621 memset(buf, 0, 16);
1622 sprintf(buf, "rd_pages=8");
1623 t->set_configfs_dev_params(hba, se_dev, buf, sizeof(buf));
1624
1625 dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
1626 if (!(dev) || IS_ERR(dev)) {
1627 ret = -ENOMEM;
1628 goto out;
1629 }
1630 se_dev->se_dev_ptr = dev;
1631 se_global->g_lun0_dev = dev;
1632
1633 return 0;
1634 out:
1635 se_global->g_lun0_su_dev = NULL;
1636 kfree(se_dev);
1637 if (se_global->g_lun0_hba) {
1638 core_delete_hba(se_global->g_lun0_hba);
1639 se_global->g_lun0_hba = NULL;
1640 }
1641 return ret;
1642 }
1643
1644
1645 void core_dev_release_virtual_lun0(void)
1646 {
1647 struct se_hba *hba = se_global->g_lun0_hba;
1648 struct se_subsystem_dev *su_dev = se_global->g_lun0_su_dev;
1649
1650 if (!(hba))
1651 return;
1652
1653 if (se_global->g_lun0_dev)
1654 se_free_virtual_device(se_global->g_lun0_dev, hba);
1655
1656 kfree(su_dev);
1657 core_delete_hba(hba);
1658 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree