Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[muen/linux.git] / drivers / target / target_core_configfs.c
1 /*******************************************************************************
2  * Filename:  target_core_configfs.c
3  *
4  * This file contains ConfigFS logic for the Generic Target Engine project.
5  *
6  * (c) Copyright 2008-2013 Datera, Inc.
7  *
8  * Nicholas A. Bellinger <nab@kernel.org>
9  *
10  * based on configfs Copyright (C) 2005 Oracle.  All rights reserved.
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License as published by
14  * the Free Software Foundation; either version 2 of the License, or
15  * (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  ****************************************************************************/
22
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <generated/utsrelease.h>
26 #include <linux/utsname.h>
27 #include <linux/init.h>
28 #include <linux/fs.h>
29 #include <linux/namei.h>
30 #include <linux/slab.h>
31 #include <linux/types.h>
32 #include <linux/delay.h>
33 #include <linux/unistd.h>
34 #include <linux/string.h>
35 #include <linux/parser.h>
36 #include <linux/syscalls.h>
37 #include <linux/configfs.h>
38 #include <linux/spinlock.h>
39
40 #include <target/target_core_base.h>
41 #include <target/target_core_backend.h>
42 #include <target/target_core_fabric.h>
43
44 #include "target_core_internal.h"
45 #include "target_core_alua.h"
46 #include "target_core_pr.h"
47 #include "target_core_rd.h"
48 #include "target_core_xcopy.h"
49
50 #define TB_CIT_SETUP(_name, _item_ops, _group_ops, _attrs)              \
51 static void target_core_setup_##_name##_cit(struct target_backend *tb)  \
52 {                                                                       \
53         struct config_item_type *cit = &tb->tb_##_name##_cit;           \
54                                                                         \
55         cit->ct_item_ops = _item_ops;                                   \
56         cit->ct_group_ops = _group_ops;                                 \
57         cit->ct_attrs = _attrs;                                         \
58         cit->ct_owner = tb->ops->owner;                                 \
59         pr_debug("Setup generic %s\n", __stringify(_name));             \
60 }
61
62 #define TB_CIT_SETUP_DRV(_name, _item_ops, _group_ops)                  \
63 static void target_core_setup_##_name##_cit(struct target_backend *tb)  \
64 {                                                                       \
65         struct config_item_type *cit = &tb->tb_##_name##_cit;           \
66                                                                         \
67         cit->ct_item_ops = _item_ops;                                   \
68         cit->ct_group_ops = _group_ops;                                 \
69         cit->ct_attrs = tb->ops->tb_##_name##_attrs;                    \
70         cit->ct_owner = tb->ops->owner;                                 \
71         pr_debug("Setup generic %s\n", __stringify(_name));             \
72 }
73
74 extern struct t10_alua_lu_gp *default_lu_gp;
75
76 static LIST_HEAD(g_tf_list);
77 static DEFINE_MUTEX(g_tf_lock);
78
79 static struct config_group target_core_hbagroup;
80 static struct config_group alua_group;
81 static struct config_group alua_lu_gps_group;
82
83 static inline struct se_hba *
84 item_to_hba(struct config_item *item)
85 {
86         return container_of(to_config_group(item), struct se_hba, hba_group);
87 }
88
89 /*
90  * Attributes for /sys/kernel/config/target/
91  */
92 static ssize_t target_core_item_version_show(struct config_item *item,
93                 char *page)
94 {
95         return sprintf(page, "Target Engine Core ConfigFS Infrastructure %s"
96                 " on %s/%s on "UTS_RELEASE"\n", TARGET_CORE_VERSION,
97                 utsname()->sysname, utsname()->machine);
98 }
99
100 CONFIGFS_ATTR_RO(target_core_item_, version);
101
102 char db_root[DB_ROOT_LEN] = DB_ROOT_DEFAULT;
103 static char db_root_stage[DB_ROOT_LEN];
104
105 static ssize_t target_core_item_dbroot_show(struct config_item *item,
106                                             char *page)
107 {
108         return sprintf(page, "%s\n", db_root);
109 }
110
111 static ssize_t target_core_item_dbroot_store(struct config_item *item,
112                                         const char *page, size_t count)
113 {
114         ssize_t read_bytes;
115         struct file *fp;
116
117         mutex_lock(&g_tf_lock);
118         if (!list_empty(&g_tf_list)) {
119                 mutex_unlock(&g_tf_lock);
120                 pr_err("db_root: cannot be changed: target drivers registered");
121                 return -EINVAL;
122         }
123
124         if (count > (DB_ROOT_LEN - 1)) {
125                 mutex_unlock(&g_tf_lock);
126                 pr_err("db_root: count %d exceeds DB_ROOT_LEN-1: %u\n",
127                        (int)count, DB_ROOT_LEN - 1);
128                 return -EINVAL;
129         }
130
131         read_bytes = snprintf(db_root_stage, DB_ROOT_LEN, "%s", page);
132         if (!read_bytes) {
133                 mutex_unlock(&g_tf_lock);
134                 return -EINVAL;
135         }
136         if (db_root_stage[read_bytes - 1] == '\n')
137                 db_root_stage[read_bytes - 1] = '\0';
138
139         /* validate new db root before accepting it */
140         fp = filp_open(db_root_stage, O_RDONLY, 0);
141         if (IS_ERR(fp)) {
142                 mutex_unlock(&g_tf_lock);
143                 pr_err("db_root: cannot open: %s\n", db_root_stage);
144                 return -EINVAL;
145         }
146         if (!S_ISDIR(file_inode(fp)->i_mode)) {
147                 filp_close(fp, NULL);
148                 mutex_unlock(&g_tf_lock);
149                 pr_err("db_root: not a directory: %s\n", db_root_stage);
150                 return -EINVAL;
151         }
152         filp_close(fp, NULL);
153
154         strncpy(db_root, db_root_stage, read_bytes);
155
156         mutex_unlock(&g_tf_lock);
157
158         return read_bytes;
159 }
160
161 CONFIGFS_ATTR(target_core_item_, dbroot);
162
163 static struct target_fabric_configfs *target_core_get_fabric(
164         const char *name)
165 {
166         struct target_fabric_configfs *tf;
167
168         if (!name)
169                 return NULL;
170
171         mutex_lock(&g_tf_lock);
172         list_for_each_entry(tf, &g_tf_list, tf_list) {
173                 if (!strcmp(tf->tf_ops->name, name)) {
174                         atomic_inc(&tf->tf_access_cnt);
175                         mutex_unlock(&g_tf_lock);
176                         return tf;
177                 }
178         }
179         mutex_unlock(&g_tf_lock);
180
181         return NULL;
182 }
183
184 /*
185  * Called from struct target_core_group_ops->make_group()
186  */
187 static struct config_group *target_core_register_fabric(
188         struct config_group *group,
189         const char *name)
190 {
191         struct target_fabric_configfs *tf;
192         int ret;
193
194         pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
195                         " %s\n", group, name);
196
197         tf = target_core_get_fabric(name);
198         if (!tf) {
199                 pr_debug("target_core_register_fabric() trying autoload for %s\n",
200                          name);
201
202                 /*
203                  * Below are some hardcoded request_module() calls to automatically
204                  * local fabric modules when the following is called:
205                  *
206                  * mkdir -p /sys/kernel/config/target/$MODULE_NAME
207                  *
208                  * Note that this does not limit which TCM fabric module can be
209                  * registered, but simply provids auto loading logic for modules with
210                  * mkdir(2) system calls with known TCM fabric modules.
211                  */
212
213                 if (!strncmp(name, "iscsi", 5)) {
214                         /*
215                          * Automatically load the LIO Target fabric module when the
216                          * following is called:
217                          *
218                          * mkdir -p $CONFIGFS/target/iscsi
219                          */
220                         ret = request_module("iscsi_target_mod");
221                         if (ret < 0) {
222                                 pr_debug("request_module() failed for"
223                                          " iscsi_target_mod.ko: %d\n", ret);
224                                 return ERR_PTR(-EINVAL);
225                         }
226                 } else if (!strncmp(name, "loopback", 8)) {
227                         /*
228                          * Automatically load the tcm_loop fabric module when the
229                          * following is called:
230                          *
231                          * mkdir -p $CONFIGFS/target/loopback
232                          */
233                         ret = request_module("tcm_loop");
234                         if (ret < 0) {
235                                 pr_debug("request_module() failed for"
236                                          " tcm_loop.ko: %d\n", ret);
237                                 return ERR_PTR(-EINVAL);
238                         }
239                 }
240
241                 tf = target_core_get_fabric(name);
242         }
243
244         if (!tf) {
245                 pr_debug("target_core_get_fabric() failed for %s\n",
246                          name);
247                 return ERR_PTR(-EINVAL);
248         }
249         pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"
250                         " %s\n", tf->tf_ops->name);
251         /*
252          * On a successful target_core_get_fabric() look, the returned
253          * struct target_fabric_configfs *tf will contain a usage reference.
254          */
255         pr_debug("Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> %p\n",
256                         &tf->tf_wwn_cit);
257
258         config_group_init_type_name(&tf->tf_group, name, &tf->tf_wwn_cit);
259
260         config_group_init_type_name(&tf->tf_disc_group, "discovery_auth",
261                         &tf->tf_discovery_cit);
262         configfs_add_default_group(&tf->tf_disc_group, &tf->tf_group);
263
264         pr_debug("Target_Core_ConfigFS: REGISTER -> Allocated Fabric:"
265                         " %s\n", tf->tf_group.cg_item.ci_name);
266         return &tf->tf_group;
267 }
268
269 /*
270  * Called from struct target_core_group_ops->drop_item()
271  */
272 static void target_core_deregister_fabric(
273         struct config_group *group,
274         struct config_item *item)
275 {
276         struct target_fabric_configfs *tf = container_of(
277                 to_config_group(item), struct target_fabric_configfs, tf_group);
278
279         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Looking up %s in"
280                 " tf list\n", config_item_name(item));
281
282         pr_debug("Target_Core_ConfigFS: DEREGISTER -> located fabric:"
283                         " %s\n", tf->tf_ops->name);
284         atomic_dec(&tf->tf_access_cnt);
285
286         pr_debug("Target_Core_ConfigFS: DEREGISTER -> Releasing ci"
287                         " %s\n", config_item_name(item));
288
289         configfs_remove_default_groups(&tf->tf_group);
290         config_item_put(item);
291 }
292
293 static struct configfs_group_operations target_core_fabric_group_ops = {
294         .make_group     = &target_core_register_fabric,
295         .drop_item      = &target_core_deregister_fabric,
296 };
297
298 /*
299  * All item attributes appearing in /sys/kernel/target/ appear here.
300  */
301 static struct configfs_attribute *target_core_fabric_item_attrs[] = {
302         &target_core_item_attr_version,
303         &target_core_item_attr_dbroot,
304         NULL,
305 };
306
307 /*
308  * Provides Fabrics Groups and Item Attributes for /sys/kernel/config/target/
309  */
310 static const struct config_item_type target_core_fabrics_item = {
311         .ct_group_ops   = &target_core_fabric_group_ops,
312         .ct_attrs       = target_core_fabric_item_attrs,
313         .ct_owner       = THIS_MODULE,
314 };
315
316 static struct configfs_subsystem target_core_fabrics = {
317         .su_group = {
318                 .cg_item = {
319                         .ci_namebuf = "target",
320                         .ci_type = &target_core_fabrics_item,
321                 },
322         },
323 };
324
325 int target_depend_item(struct config_item *item)
326 {
327         return configfs_depend_item(&target_core_fabrics, item);
328 }
329 EXPORT_SYMBOL(target_depend_item);
330
331 void target_undepend_item(struct config_item *item)
332 {
333         return configfs_undepend_item(item);
334 }
335 EXPORT_SYMBOL(target_undepend_item);
336
337 /*##############################################################################
338 // Start functions called by external Target Fabrics Modules
339 //############################################################################*/
340
341 static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
342 {
343         if (!tfo->name) {
344                 pr_err("Missing tfo->name\n");
345                 return -EINVAL;
346         }
347         if (strlen(tfo->name) >= TARGET_FABRIC_NAME_SIZE) {
348                 pr_err("Passed name: %s exceeds TARGET_FABRIC"
349                         "_NAME_SIZE\n", tfo->name);
350                 return -EINVAL;
351         }
352         if (!tfo->get_fabric_name) {
353                 pr_err("Missing tfo->get_fabric_name()\n");
354                 return -EINVAL;
355         }
356         if (!tfo->tpg_get_wwn) {
357                 pr_err("Missing tfo->tpg_get_wwn()\n");
358                 return -EINVAL;
359         }
360         if (!tfo->tpg_get_tag) {
361                 pr_err("Missing tfo->tpg_get_tag()\n");
362                 return -EINVAL;
363         }
364         if (!tfo->tpg_check_demo_mode) {
365                 pr_err("Missing tfo->tpg_check_demo_mode()\n");
366                 return -EINVAL;
367         }
368         if (!tfo->tpg_check_demo_mode_cache) {
369                 pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
370                 return -EINVAL;
371         }
372         if (!tfo->tpg_check_demo_mode_write_protect) {
373                 pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
374                 return -EINVAL;
375         }
376         if (!tfo->tpg_check_prod_mode_write_protect) {
377                 pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
378                 return -EINVAL;
379         }
380         if (!tfo->tpg_get_inst_index) {
381                 pr_err("Missing tfo->tpg_get_inst_index()\n");
382                 return -EINVAL;
383         }
384         if (!tfo->release_cmd) {
385                 pr_err("Missing tfo->release_cmd()\n");
386                 return -EINVAL;
387         }
388         if (!tfo->sess_get_index) {
389                 pr_err("Missing tfo->sess_get_index()\n");
390                 return -EINVAL;
391         }
392         if (!tfo->write_pending) {
393                 pr_err("Missing tfo->write_pending()\n");
394                 return -EINVAL;
395         }
396         if (!tfo->write_pending_status) {
397                 pr_err("Missing tfo->write_pending_status()\n");
398                 return -EINVAL;
399         }
400         if (!tfo->set_default_node_attributes) {
401                 pr_err("Missing tfo->set_default_node_attributes()\n");
402                 return -EINVAL;
403         }
404         if (!tfo->get_cmd_state) {
405                 pr_err("Missing tfo->get_cmd_state()\n");
406                 return -EINVAL;
407         }
408         if (!tfo->queue_data_in) {
409                 pr_err("Missing tfo->queue_data_in()\n");
410                 return -EINVAL;
411         }
412         if (!tfo->queue_status) {
413                 pr_err("Missing tfo->queue_status()\n");
414                 return -EINVAL;
415         }
416         if (!tfo->queue_tm_rsp) {
417                 pr_err("Missing tfo->queue_tm_rsp()\n");
418                 return -EINVAL;
419         }
420         if (!tfo->aborted_task) {
421                 pr_err("Missing tfo->aborted_task()\n");
422                 return -EINVAL;
423         }
424         if (!tfo->check_stop_free) {
425                 pr_err("Missing tfo->check_stop_free()\n");
426                 return -EINVAL;
427         }
428         /*
429          * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
430          * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in
431          * target_core_fabric_configfs.c WWN+TPG group context code.
432          */
433         if (!tfo->fabric_make_wwn) {
434                 pr_err("Missing tfo->fabric_make_wwn()\n");
435                 return -EINVAL;
436         }
437         if (!tfo->fabric_drop_wwn) {
438                 pr_err("Missing tfo->fabric_drop_wwn()\n");
439                 return -EINVAL;
440         }
441         if (!tfo->fabric_make_tpg) {
442                 pr_err("Missing tfo->fabric_make_tpg()\n");
443                 return -EINVAL;
444         }
445         if (!tfo->fabric_drop_tpg) {
446                 pr_err("Missing tfo->fabric_drop_tpg()\n");
447                 return -EINVAL;
448         }
449
450         return 0;
451 }
452
453 int target_register_template(const struct target_core_fabric_ops *fo)
454 {
455         struct target_fabric_configfs *tf;
456         int ret;
457
458         ret = target_fabric_tf_ops_check(fo);
459         if (ret)
460                 return ret;
461
462         tf = kzalloc(sizeof(struct target_fabric_configfs), GFP_KERNEL);
463         if (!tf) {
464                 pr_err("%s: could not allocate memory!\n", __func__);
465                 return -ENOMEM;
466         }
467
468         INIT_LIST_HEAD(&tf->tf_list);
469         atomic_set(&tf->tf_access_cnt, 0);
470         tf->tf_ops = fo;
471         target_fabric_setup_cits(tf);
472
473         mutex_lock(&g_tf_lock);
474         list_add_tail(&tf->tf_list, &g_tf_list);
475         mutex_unlock(&g_tf_lock);
476
477         return 0;
478 }
479 EXPORT_SYMBOL(target_register_template);
480
481 void target_unregister_template(const struct target_core_fabric_ops *fo)
482 {
483         struct target_fabric_configfs *t;
484
485         mutex_lock(&g_tf_lock);
486         list_for_each_entry(t, &g_tf_list, tf_list) {
487                 if (!strcmp(t->tf_ops->name, fo->name)) {
488                         BUG_ON(atomic_read(&t->tf_access_cnt));
489                         list_del(&t->tf_list);
490                         mutex_unlock(&g_tf_lock);
491                         /*
492                          * Wait for any outstanding fabric se_deve_entry->rcu_head
493                          * callbacks to complete post kfree_rcu(), before allowing
494                          * fabric driver unload of TFO->module to proceed.
495                          */
496                         rcu_barrier();
497                         kfree(t);
498                         return;
499                 }
500         }
501         mutex_unlock(&g_tf_lock);
502 }
503 EXPORT_SYMBOL(target_unregister_template);
504
505 /*##############################################################################
506 // Stop functions called by external Target Fabrics Modules
507 //############################################################################*/
508
509 static inline struct se_dev_attrib *to_attrib(struct config_item *item)
510 {
511         return container_of(to_config_group(item), struct se_dev_attrib,
512                         da_group);
513 }
514
515 /* Start functions for struct config_item_type tb_dev_attrib_cit */
516 #define DEF_CONFIGFS_ATTRIB_SHOW(_name)                                 \
517 static ssize_t _name##_show(struct config_item *item, char *page)       \
518 {                                                                       \
519         return snprintf(page, PAGE_SIZE, "%u\n", to_attrib(item)->_name); \
520 }
521
522 DEF_CONFIGFS_ATTRIB_SHOW(emulate_model_alias);
523 DEF_CONFIGFS_ATTRIB_SHOW(emulate_dpo);
524 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_write);
525 DEF_CONFIGFS_ATTRIB_SHOW(emulate_fua_read);
526 DEF_CONFIGFS_ATTRIB_SHOW(emulate_write_cache);
527 DEF_CONFIGFS_ATTRIB_SHOW(emulate_ua_intlck_ctrl);
528 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tas);
529 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpu);
530 DEF_CONFIGFS_ATTRIB_SHOW(emulate_tpws);
531 DEF_CONFIGFS_ATTRIB_SHOW(emulate_caw);
532 DEF_CONFIGFS_ATTRIB_SHOW(emulate_3pc);
533 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_type);
534 DEF_CONFIGFS_ATTRIB_SHOW(hw_pi_prot_type);
535 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_format);
536 DEF_CONFIGFS_ATTRIB_SHOW(pi_prot_verify);
537 DEF_CONFIGFS_ATTRIB_SHOW(enforce_pr_isids);
538 DEF_CONFIGFS_ATTRIB_SHOW(is_nonrot);
539 DEF_CONFIGFS_ATTRIB_SHOW(emulate_rest_reord);
540 DEF_CONFIGFS_ATTRIB_SHOW(force_pr_aptpl);
541 DEF_CONFIGFS_ATTRIB_SHOW(hw_block_size);
542 DEF_CONFIGFS_ATTRIB_SHOW(block_size);
543 DEF_CONFIGFS_ATTRIB_SHOW(hw_max_sectors);
544 DEF_CONFIGFS_ATTRIB_SHOW(optimal_sectors);
545 DEF_CONFIGFS_ATTRIB_SHOW(hw_queue_depth);
546 DEF_CONFIGFS_ATTRIB_SHOW(queue_depth);
547 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_lba_count);
548 DEF_CONFIGFS_ATTRIB_SHOW(max_unmap_block_desc_count);
549 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity);
550 DEF_CONFIGFS_ATTRIB_SHOW(unmap_granularity_alignment);
551 DEF_CONFIGFS_ATTRIB_SHOW(unmap_zeroes_data);
552 DEF_CONFIGFS_ATTRIB_SHOW(max_write_same_len);
553
554 #define DEF_CONFIGFS_ATTRIB_STORE_U32(_name)                            \
555 static ssize_t _name##_store(struct config_item *item, const char *page,\
556                 size_t count)                                           \
557 {                                                                       \
558         struct se_dev_attrib *da = to_attrib(item);                     \
559         u32 val;                                                        \
560         int ret;                                                        \
561                                                                         \
562         ret = kstrtou32(page, 0, &val);                                 \
563         if (ret < 0)                                                    \
564                 return ret;                                             \
565         da->_name = val;                                                \
566         return count;                                                   \
567 }
568
569 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_lba_count);
570 DEF_CONFIGFS_ATTRIB_STORE_U32(max_unmap_block_desc_count);
571 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity);
572 DEF_CONFIGFS_ATTRIB_STORE_U32(unmap_granularity_alignment);
573 DEF_CONFIGFS_ATTRIB_STORE_U32(max_write_same_len);
574
575 #define DEF_CONFIGFS_ATTRIB_STORE_BOOL(_name)                           \
576 static ssize_t _name##_store(struct config_item *item, const char *page,        \
577                 size_t count)                                           \
578 {                                                                       \
579         struct se_dev_attrib *da = to_attrib(item);                     \
580         bool flag;                                                      \
581         int ret;                                                        \
582                                                                         \
583         ret = strtobool(page, &flag);                                   \
584         if (ret < 0)                                                    \
585                 return ret;                                             \
586         da->_name = flag;                                               \
587         return count;                                                   \
588 }
589
590 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_fua_write);
591 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_caw);
592 DEF_CONFIGFS_ATTRIB_STORE_BOOL(emulate_3pc);
593 DEF_CONFIGFS_ATTRIB_STORE_BOOL(enforce_pr_isids);
594 DEF_CONFIGFS_ATTRIB_STORE_BOOL(is_nonrot);
595
596 #define DEF_CONFIGFS_ATTRIB_STORE_STUB(_name)                           \
597 static ssize_t _name##_store(struct config_item *item, const char *page,\
598                 size_t count)                                           \
599 {                                                                       \
600         printk_once(KERN_WARNING                                        \
601                 "ignoring deprecated %s attribute\n",                   \
602                 __stringify(_name));                                    \
603         return count;                                                   \
604 }
605
606 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_dpo);
607 DEF_CONFIGFS_ATTRIB_STORE_STUB(emulate_fua_read);
608
609 static void dev_set_t10_wwn_model_alias(struct se_device *dev)
610 {
611         const char *configname;
612
613         configname = config_item_name(&dev->dev_group.cg_item);
614         if (strlen(configname) >= 16) {
615                 pr_warn("dev[%p]: Backstore name '%s' is too long for "
616                         "INQUIRY_MODEL, truncating to 16 bytes\n", dev,
617                         configname);
618         }
619         snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
620 }
621
622 static ssize_t emulate_model_alias_store(struct config_item *item,
623                 const char *page, size_t count)
624 {
625         struct se_dev_attrib *da = to_attrib(item);
626         struct se_device *dev = da->da_dev;
627         bool flag;
628         int ret;
629
630         if (dev->export_count) {
631                 pr_err("dev[%p]: Unable to change model alias"
632                         " while export_count is %d\n",
633                         dev, dev->export_count);
634                 return -EINVAL;
635         }
636
637         ret = strtobool(page, &flag);
638         if (ret < 0)
639                 return ret;
640
641         if (flag) {
642                 dev_set_t10_wwn_model_alias(dev);
643         } else {
644                 strncpy(&dev->t10_wwn.model[0],
645                         dev->transport->inquiry_prod, 16);
646         }
647         da->emulate_model_alias = flag;
648         return count;
649 }
650
651 static ssize_t emulate_write_cache_store(struct config_item *item,
652                 const char *page, size_t count)
653 {
654         struct se_dev_attrib *da = to_attrib(item);
655         bool flag;
656         int ret;
657
658         ret = strtobool(page, &flag);
659         if (ret < 0)
660                 return ret;
661
662         if (flag && da->da_dev->transport->get_write_cache) {
663                 pr_err("emulate_write_cache not supported for this device\n");
664                 return -EINVAL;
665         }
666
667         da->emulate_write_cache = flag;
668         pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
669                         da->da_dev, flag);
670         return count;
671 }
672
673 static ssize_t emulate_ua_intlck_ctrl_store(struct config_item *item,
674                 const char *page, size_t count)
675 {
676         struct se_dev_attrib *da = to_attrib(item);
677         u32 val;
678         int ret;
679
680         ret = kstrtou32(page, 0, &val);
681         if (ret < 0)
682                 return ret;
683
684         if (val != 0 && val != 1 && val != 2) {
685                 pr_err("Illegal value %d\n", val);
686                 return -EINVAL;
687         }
688
689         if (da->da_dev->export_count) {
690                 pr_err("dev[%p]: Unable to change SE Device"
691                         " UA_INTRLCK_CTRL while export_count is %d\n",
692                         da->da_dev, da->da_dev->export_count);
693                 return -EINVAL;
694         }
695         da->emulate_ua_intlck_ctrl = val;
696         pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
697                 da->da_dev, val);
698         return count;
699 }
700
701 static ssize_t emulate_tas_store(struct config_item *item,
702                 const char *page, size_t count)
703 {
704         struct se_dev_attrib *da = to_attrib(item);
705         bool flag;
706         int ret;
707
708         ret = strtobool(page, &flag);
709         if (ret < 0)
710                 return ret;
711
712         if (da->da_dev->export_count) {
713                 pr_err("dev[%p]: Unable to change SE Device TAS while"
714                         " export_count is %d\n",
715                         da->da_dev, da->da_dev->export_count);
716                 return -EINVAL;
717         }
718         da->emulate_tas = flag;
719         pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
720                 da->da_dev, flag ? "Enabled" : "Disabled");
721
722         return count;
723 }
724
725 static ssize_t emulate_tpu_store(struct config_item *item,
726                 const char *page, size_t count)
727 {
728         struct se_dev_attrib *da = to_attrib(item);
729         bool flag;
730         int ret;
731
732         ret = strtobool(page, &flag);
733         if (ret < 0)
734                 return ret;
735
736         /*
737          * We expect this value to be non-zero when generic Block Layer
738          * Discard supported is detected iblock_create_virtdevice().
739          */
740         if (flag && !da->max_unmap_block_desc_count) {
741                 pr_err("Generic Block Discard not supported\n");
742                 return -ENOSYS;
743         }
744
745         da->emulate_tpu = flag;
746         pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
747                 da->da_dev, flag);
748         return count;
749 }
750
751 static ssize_t emulate_tpws_store(struct config_item *item,
752                 const char *page, size_t count)
753 {
754         struct se_dev_attrib *da = to_attrib(item);
755         bool flag;
756         int ret;
757
758         ret = strtobool(page, &flag);
759         if (ret < 0)
760                 return ret;
761
762         /*
763          * We expect this value to be non-zero when generic Block Layer
764          * Discard supported is detected iblock_create_virtdevice().
765          */
766         if (flag && !da->max_unmap_block_desc_count) {
767                 pr_err("Generic Block Discard not supported\n");
768                 return -ENOSYS;
769         }
770
771         da->emulate_tpws = flag;
772         pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
773                                 da->da_dev, flag);
774         return count;
775 }
776
777 static ssize_t pi_prot_type_store(struct config_item *item,
778                 const char *page, size_t count)
779 {
780         struct se_dev_attrib *da = to_attrib(item);
781         int old_prot = da->pi_prot_type, ret;
782         struct se_device *dev = da->da_dev;
783         u32 flag;
784
785         ret = kstrtou32(page, 0, &flag);
786         if (ret < 0)
787                 return ret;
788
789         if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
790                 pr_err("Illegal value %d for pi_prot_type\n", flag);
791                 return -EINVAL;
792         }
793         if (flag == 2) {
794                 pr_err("DIF TYPE2 protection currently not supported\n");
795                 return -ENOSYS;
796         }
797         if (da->hw_pi_prot_type) {
798                 pr_warn("DIF protection enabled on underlying hardware,"
799                         " ignoring\n");
800                 return count;
801         }
802         if (!dev->transport->init_prot || !dev->transport->free_prot) {
803                 /* 0 is only allowed value for non-supporting backends */
804                 if (flag == 0)
805                         return count;
806
807                 pr_err("DIF protection not supported by backend: %s\n",
808                        dev->transport->name);
809                 return -ENOSYS;
810         }
811         if (!(dev->dev_flags & DF_CONFIGURED)) {
812                 pr_err("DIF protection requires device to be configured\n");
813                 return -ENODEV;
814         }
815         if (dev->export_count) {
816                 pr_err("dev[%p]: Unable to change SE Device PROT type while"
817                        " export_count is %d\n", dev, dev->export_count);
818                 return -EINVAL;
819         }
820
821         da->pi_prot_type = flag;
822
823         if (flag && !old_prot) {
824                 ret = dev->transport->init_prot(dev);
825                 if (ret) {
826                         da->pi_prot_type = old_prot;
827                         da->pi_prot_verify = (bool) da->pi_prot_type;
828                         return ret;
829                 }
830
831         } else if (!flag && old_prot) {
832                 dev->transport->free_prot(dev);
833         }
834
835         da->pi_prot_verify = (bool) da->pi_prot_type;
836         pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
837         return count;
838 }
839
840 static ssize_t pi_prot_format_store(struct config_item *item,
841                 const char *page, size_t count)
842 {
843         struct se_dev_attrib *da = to_attrib(item);
844         struct se_device *dev = da->da_dev;
845         bool flag;
846         int ret;
847
848         ret = strtobool(page, &flag);
849         if (ret < 0)
850                 return ret;
851
852         if (!flag)
853                 return count;
854
855         if (!dev->transport->format_prot) {
856                 pr_err("DIF protection format not supported by backend %s\n",
857                        dev->transport->name);
858                 return -ENOSYS;
859         }
860         if (!(dev->dev_flags & DF_CONFIGURED)) {
861                 pr_err("DIF protection format requires device to be configured\n");
862                 return -ENODEV;
863         }
864         if (dev->export_count) {
865                 pr_err("dev[%p]: Unable to format SE Device PROT type while"
866                        " export_count is %d\n", dev, dev->export_count);
867                 return -EINVAL;
868         }
869
870         ret = dev->transport->format_prot(dev);
871         if (ret)
872                 return ret;
873
874         pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);
875         return count;
876 }
877
878 static ssize_t pi_prot_verify_store(struct config_item *item,
879                 const char *page, size_t count)
880 {
881         struct se_dev_attrib *da = to_attrib(item);
882         bool flag;
883         int ret;
884
885         ret = strtobool(page, &flag);
886         if (ret < 0)
887                 return ret;
888
889         if (!flag) {
890                 da->pi_prot_verify = flag;
891                 return count;
892         }
893         if (da->hw_pi_prot_type) {
894                 pr_warn("DIF protection enabled on underlying hardware,"
895                         " ignoring\n");
896                 return count;
897         }
898         if (!da->pi_prot_type) {
899                 pr_warn("DIF protection not supported by backend, ignoring\n");
900                 return count;
901         }
902         da->pi_prot_verify = flag;
903
904         return count;
905 }
906
907 static ssize_t force_pr_aptpl_store(struct config_item *item,
908                 const char *page, size_t count)
909 {
910         struct se_dev_attrib *da = to_attrib(item);
911         bool flag;
912         int ret;
913
914         ret = strtobool(page, &flag);
915         if (ret < 0)
916                 return ret;
917         if (da->da_dev->export_count) {
918                 pr_err("dev[%p]: Unable to set force_pr_aptpl while"
919                        " export_count is %d\n",
920                        da->da_dev, da->da_dev->export_count);
921                 return -EINVAL;
922         }
923
924         da->force_pr_aptpl = flag;
925         pr_debug("dev[%p]: SE Device force_pr_aptpl: %d\n", da->da_dev, flag);
926         return count;
927 }
928
929 static ssize_t emulate_rest_reord_store(struct config_item *item,
930                 const char *page, size_t count)
931 {
932         struct se_dev_attrib *da = to_attrib(item);
933         bool flag;
934         int ret;
935
936         ret = strtobool(page, &flag);
937         if (ret < 0)
938                 return ret;
939
940         if (flag != 0) {
941                 printk(KERN_ERR "dev[%p]: SE Device emulation of restricted"
942                         " reordering not implemented\n", da->da_dev);
943                 return -ENOSYS;
944         }
945         da->emulate_rest_reord = flag;
946         pr_debug("dev[%p]: SE Device emulate_rest_reord: %d\n",
947                 da->da_dev, flag);
948         return count;
949 }
950
951 static ssize_t unmap_zeroes_data_store(struct config_item *item,
952                 const char *page, size_t count)
953 {
954         struct se_dev_attrib *da = to_attrib(item);
955         bool flag;
956         int ret;
957
958         ret = strtobool(page, &flag);
959         if (ret < 0)
960                 return ret;
961
962         if (da->da_dev->export_count) {
963                 pr_err("dev[%p]: Unable to change SE Device"
964                        " unmap_zeroes_data while export_count is %d\n",
965                        da->da_dev, da->da_dev->export_count);
966                 return -EINVAL;
967         }
968         /*
969          * We expect this value to be non-zero when generic Block Layer
970          * Discard supported is detected iblock_configure_device().
971          */
972         if (flag && !da->max_unmap_block_desc_count) {
973                 pr_err("dev[%p]: Thin Provisioning LBPRZ will not be set"
974                        " because max_unmap_block_desc_count is zero\n",
975                        da->da_dev);
976                 return -ENOSYS;
977         }
978         da->unmap_zeroes_data = flag;
979         pr_debug("dev[%p]: SE Device Thin Provisioning LBPRZ bit: %d\n",
980                  da->da_dev, flag);
981         return count;
982 }
983
984 /*
985  * Note, this can only be called on unexported SE Device Object.
986  */
987 static ssize_t queue_depth_store(struct config_item *item,
988                 const char *page, size_t count)
989 {
990         struct se_dev_attrib *da = to_attrib(item);
991         struct se_device *dev = da->da_dev;
992         u32 val;
993         int ret;
994
995         ret = kstrtou32(page, 0, &val);
996         if (ret < 0)
997                 return ret;
998
999         if (dev->export_count) {
1000                 pr_err("dev[%p]: Unable to change SE Device TCQ while"
1001                         " export_count is %d\n",
1002                         dev, dev->export_count);
1003                 return -EINVAL;
1004         }
1005         if (!val) {
1006                 pr_err("dev[%p]: Illegal ZERO value for queue_depth\n", dev);
1007                 return -EINVAL;
1008         }
1009
1010         if (val > dev->dev_attrib.queue_depth) {
1011                 if (val > dev->dev_attrib.hw_queue_depth) {
1012                         pr_err("dev[%p]: Passed queue_depth:"
1013                                 " %u exceeds TCM/SE_Device MAX"
1014                                 " TCQ: %u\n", dev, val,
1015                                 dev->dev_attrib.hw_queue_depth);
1016                         return -EINVAL;
1017                 }
1018         }
1019         da->queue_depth = dev->queue_depth = val;
1020         pr_debug("dev[%p]: SE Device TCQ Depth changed to: %u\n", dev, val);
1021         return count;
1022 }
1023
1024 static ssize_t optimal_sectors_store(struct config_item *item,
1025                 const char *page, size_t count)
1026 {
1027         struct se_dev_attrib *da = to_attrib(item);
1028         u32 val;
1029         int ret;
1030
1031         ret = kstrtou32(page, 0, &val);
1032         if (ret < 0)
1033                 return ret;
1034
1035         if (da->da_dev->export_count) {
1036                 pr_err("dev[%p]: Unable to change SE Device"
1037                         " optimal_sectors while export_count is %d\n",
1038                         da->da_dev, da->da_dev->export_count);
1039                 return -EINVAL;
1040         }
1041         if (val > da->hw_max_sectors) {
1042                 pr_err("dev[%p]: Passed optimal_sectors %u cannot be"
1043                         " greater than hw_max_sectors: %u\n",
1044                         da->da_dev, val, da->hw_max_sectors);
1045                 return -EINVAL;
1046         }
1047
1048         da->optimal_sectors = val;
1049         pr_debug("dev[%p]: SE Device optimal_sectors changed to %u\n",
1050                         da->da_dev, val);
1051         return count;
1052 }
1053
1054 static ssize_t block_size_store(struct config_item *item,
1055                 const char *page, size_t count)
1056 {
1057         struct se_dev_attrib *da = to_attrib(item);
1058         u32 val;
1059         int ret;
1060
1061         ret = kstrtou32(page, 0, &val);
1062         if (ret < 0)
1063                 return ret;
1064
1065         if (da->da_dev->export_count) {
1066                 pr_err("dev[%p]: Unable to change SE Device block_size"
1067                         " while export_count is %d\n",
1068                         da->da_dev, da->da_dev->export_count);
1069                 return -EINVAL;
1070         }
1071
1072         if (val != 512 && val != 1024 && val != 2048 && val != 4096) {
1073                 pr_err("dev[%p]: Illegal value for block_device: %u"
1074                         " for SE device, must be 512, 1024, 2048 or 4096\n",
1075                         da->da_dev, val);
1076                 return -EINVAL;
1077         }
1078
1079         da->block_size = val;
1080         if (da->max_bytes_per_io)
1081                 da->hw_max_sectors = da->max_bytes_per_io / val;
1082
1083         pr_debug("dev[%p]: SE Device block_size changed to %u\n",
1084                         da->da_dev, val);
1085         return count;
1086 }
1087
1088 static ssize_t alua_support_show(struct config_item *item, char *page)
1089 {
1090         struct se_dev_attrib *da = to_attrib(item);
1091         u8 flags = da->da_dev->transport->transport_flags;
1092
1093         return snprintf(page, PAGE_SIZE, "%d\n",
1094                         flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ? 0 : 1);
1095 }
1096
1097 static ssize_t pgr_support_show(struct config_item *item, char *page)
1098 {
1099         struct se_dev_attrib *da = to_attrib(item);
1100         u8 flags = da->da_dev->transport->transport_flags;
1101
1102         return snprintf(page, PAGE_SIZE, "%d\n",
1103                         flags & TRANSPORT_FLAG_PASSTHROUGH_PGR ? 0 : 1);
1104 }
1105
1106 CONFIGFS_ATTR(, emulate_model_alias);
1107 CONFIGFS_ATTR(, emulate_dpo);
1108 CONFIGFS_ATTR(, emulate_fua_write);
1109 CONFIGFS_ATTR(, emulate_fua_read);
1110 CONFIGFS_ATTR(, emulate_write_cache);
1111 CONFIGFS_ATTR(, emulate_ua_intlck_ctrl);
1112 CONFIGFS_ATTR(, emulate_tas);
1113 CONFIGFS_ATTR(, emulate_tpu);
1114 CONFIGFS_ATTR(, emulate_tpws);
1115 CONFIGFS_ATTR(, emulate_caw);
1116 CONFIGFS_ATTR(, emulate_3pc);
1117 CONFIGFS_ATTR(, pi_prot_type);
1118 CONFIGFS_ATTR_RO(, hw_pi_prot_type);
1119 CONFIGFS_ATTR(, pi_prot_format);
1120 CONFIGFS_ATTR(, pi_prot_verify);
1121 CONFIGFS_ATTR(, enforce_pr_isids);
1122 CONFIGFS_ATTR(, is_nonrot);
1123 CONFIGFS_ATTR(, emulate_rest_reord);
1124 CONFIGFS_ATTR(, force_pr_aptpl);
1125 CONFIGFS_ATTR_RO(, hw_block_size);
1126 CONFIGFS_ATTR(, block_size);
1127 CONFIGFS_ATTR_RO(, hw_max_sectors);
1128 CONFIGFS_ATTR(, optimal_sectors);
1129 CONFIGFS_ATTR_RO(, hw_queue_depth);
1130 CONFIGFS_ATTR(, queue_depth);
1131 CONFIGFS_ATTR(, max_unmap_lba_count);
1132 CONFIGFS_ATTR(, max_unmap_block_desc_count);
1133 CONFIGFS_ATTR(, unmap_granularity);
1134 CONFIGFS_ATTR(, unmap_granularity_alignment);
1135 CONFIGFS_ATTR(, unmap_zeroes_data);
1136 CONFIGFS_ATTR(, max_write_same_len);
1137 CONFIGFS_ATTR_RO(, alua_support);
1138 CONFIGFS_ATTR_RO(, pgr_support);
1139
1140 /*
1141  * dev_attrib attributes for devices using the target core SBC/SPC
1142  * interpreter.  Any backend using spc_parse_cdb should be using
1143  * these.
1144  */
1145 struct configfs_attribute *sbc_attrib_attrs[] = {
1146         &attr_emulate_model_alias,
1147         &attr_emulate_dpo,
1148         &attr_emulate_fua_write,
1149         &attr_emulate_fua_read,
1150         &attr_emulate_write_cache,
1151         &attr_emulate_ua_intlck_ctrl,
1152         &attr_emulate_tas,
1153         &attr_emulate_tpu,
1154         &attr_emulate_tpws,
1155         &attr_emulate_caw,
1156         &attr_emulate_3pc,
1157         &attr_pi_prot_type,
1158         &attr_hw_pi_prot_type,
1159         &attr_pi_prot_format,
1160         &attr_pi_prot_verify,
1161         &attr_enforce_pr_isids,
1162         &attr_is_nonrot,
1163         &attr_emulate_rest_reord,
1164         &attr_force_pr_aptpl,
1165         &attr_hw_block_size,
1166         &attr_block_size,
1167         &attr_hw_max_sectors,
1168         &attr_optimal_sectors,
1169         &attr_hw_queue_depth,
1170         &attr_queue_depth,
1171         &attr_max_unmap_lba_count,
1172         &attr_max_unmap_block_desc_count,
1173         &attr_unmap_granularity,
1174         &attr_unmap_granularity_alignment,
1175         &attr_unmap_zeroes_data,
1176         &attr_max_write_same_len,
1177         &attr_alua_support,
1178         &attr_pgr_support,
1179         NULL,
1180 };
1181 EXPORT_SYMBOL(sbc_attrib_attrs);
1182
1183 /*
1184  * Minimal dev_attrib attributes for devices passing through CDBs.
1185  * In this case we only provide a few read-only attributes for
1186  * backwards compatibility.
1187  */
1188 struct configfs_attribute *passthrough_attrib_attrs[] = {
1189         &attr_hw_pi_prot_type,
1190         &attr_hw_block_size,
1191         &attr_hw_max_sectors,
1192         &attr_hw_queue_depth,
1193         &attr_alua_support,
1194         &attr_pgr_support,
1195         NULL,
1196 };
1197 EXPORT_SYMBOL(passthrough_attrib_attrs);
1198
1199 TB_CIT_SETUP_DRV(dev_attrib, NULL, NULL);
1200
1201 /* End functions for struct config_item_type tb_dev_attrib_cit */
1202
1203 /*  Start functions for struct config_item_type tb_dev_wwn_cit */
1204
1205 static struct t10_wwn *to_t10_wwn(struct config_item *item)
1206 {
1207         return container_of(to_config_group(item), struct t10_wwn, t10_wwn_group);
1208 }
1209
1210 /*
1211  * VPD page 0x80 Unit serial
1212  */
1213 static ssize_t target_wwn_vpd_unit_serial_show(struct config_item *item,
1214                 char *page)
1215 {
1216         return sprintf(page, "T10 VPD Unit Serial Number: %s\n",
1217                 &to_t10_wwn(item)->unit_serial[0]);
1218 }
1219
1220 static ssize_t target_wwn_vpd_unit_serial_store(struct config_item *item,
1221                 const char *page, size_t count)
1222 {
1223         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1224         struct se_device *dev = t10_wwn->t10_dev;
1225         unsigned char buf[INQUIRY_VPD_SERIAL_LEN];
1226
1227         /*
1228          * If Linux/SCSI subsystem_api_t plugin got a VPD Unit Serial
1229          * from the struct scsi_device level firmware, do not allow
1230          * VPD Unit Serial to be emulated.
1231          *
1232          * Note this struct scsi_device could also be emulating VPD
1233          * information from its drivers/scsi LLD.  But for now we assume
1234          * it is doing 'the right thing' wrt a world wide unique
1235          * VPD Unit Serial Number that OS dependent multipath can depend on.
1236          */
1237         if (dev->dev_flags & DF_FIRMWARE_VPD_UNIT_SERIAL) {
1238                 pr_err("Underlying SCSI device firmware provided VPD"
1239                         " Unit Serial, ignoring request\n");
1240                 return -EOPNOTSUPP;
1241         }
1242
1243         if (strlen(page) >= INQUIRY_VPD_SERIAL_LEN) {
1244                 pr_err("Emulated VPD Unit Serial exceeds"
1245                 " INQUIRY_VPD_SERIAL_LEN: %d\n", INQUIRY_VPD_SERIAL_LEN);
1246                 return -EOVERFLOW;
1247         }
1248         /*
1249          * Check to see if any active $FABRIC_MOD exports exist.  If they
1250          * do exist, fail here as changing this information on the fly
1251          * (underneath the initiator side OS dependent multipath code)
1252          * could cause negative effects.
1253          */
1254         if (dev->export_count) {
1255                 pr_err("Unable to set VPD Unit Serial while"
1256                         " active %d $FABRIC_MOD exports exist\n",
1257                         dev->export_count);
1258                 return -EINVAL;
1259         }
1260
1261         /*
1262          * This currently assumes ASCII encoding for emulated VPD Unit Serial.
1263          *
1264          * Also, strip any newline added from the userspace
1265          * echo $UUID > $TARGET/$HBA/$STORAGE_OBJECT/wwn/vpd_unit_serial
1266          */
1267         memset(buf, 0, INQUIRY_VPD_SERIAL_LEN);
1268         snprintf(buf, INQUIRY_VPD_SERIAL_LEN, "%s", page);
1269         snprintf(dev->t10_wwn.unit_serial, INQUIRY_VPD_SERIAL_LEN,
1270                         "%s", strstrip(buf));
1271         dev->dev_flags |= DF_EMULATED_VPD_UNIT_SERIAL;
1272
1273         pr_debug("Target_Core_ConfigFS: Set emulated VPD Unit Serial:"
1274                         " %s\n", dev->t10_wwn.unit_serial);
1275
1276         return count;
1277 }
1278
1279 /*
1280  * VPD page 0x83 Protocol Identifier
1281  */
1282 static ssize_t target_wwn_vpd_protocol_identifier_show(struct config_item *item,
1283                 char *page)
1284 {
1285         struct t10_wwn *t10_wwn = to_t10_wwn(item);
1286         struct t10_vpd *vpd;
1287         unsigned char buf[VPD_TMP_BUF_SIZE];
1288         ssize_t len = 0;
1289
1290         memset(buf, 0, VPD_TMP_BUF_SIZE);
1291
1292         spin_lock(&t10_wwn->t10_vpd_lock);
1293         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {
1294                 if (!vpd->protocol_identifier_set)
1295                         continue;
1296
1297                 transport_dump_vpd_proto_id(vpd, buf, VPD_TMP_BUF_SIZE);
1298
1299                 if (len + strlen(buf) >= PAGE_SIZE)
1300                         break;
1301
1302                 len += sprintf(page+len, "%s", buf);
1303         }
1304         spin_unlock(&t10_wwn->t10_vpd_lock);
1305
1306         return len;
1307 }
1308
1309 /*
1310  * Generic wrapper for dumping VPD identifiers by association.
1311  */
1312 #define DEF_DEV_WWN_ASSOC_SHOW(_name, _assoc)                           \
1313 static ssize_t target_wwn_##_name##_show(struct config_item *item,      \
1314                 char *page)                                             \
1315 {                                                                       \
1316         struct t10_wwn *t10_wwn = to_t10_wwn(item);                     \
1317         struct t10_vpd *vpd;                                            \
1318         unsigned char buf[VPD_TMP_BUF_SIZE];                            \
1319         ssize_t len = 0;                                                \
1320                                                                         \
1321         spin_lock(&t10_wwn->t10_vpd_lock);                              \
1322         list_for_each_entry(vpd, &t10_wwn->t10_vpd_list, vpd_list) {    \
1323                 if (vpd->association != _assoc)                         \
1324                         continue;                                       \
1325                                                                         \
1326                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1327                 transport_dump_vpd_assoc(vpd, buf, VPD_TMP_BUF_SIZE);   \
1328                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1329                         break;                                          \
1330                 len += sprintf(page+len, "%s", buf);                    \
1331                                                                         \
1332                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1333                 transport_dump_vpd_ident_type(vpd, buf, VPD_TMP_BUF_SIZE); \
1334                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1335                         break;                                          \
1336                 len += sprintf(page+len, "%s", buf);                    \
1337                                                                         \
1338                 memset(buf, 0, VPD_TMP_BUF_SIZE);                       \
1339                 transport_dump_vpd_ident(vpd, buf, VPD_TMP_BUF_SIZE); \
1340                 if (len + strlen(buf) >= PAGE_SIZE)                     \
1341                         break;                                          \
1342                 len += sprintf(page+len, "%s", buf);                    \
1343         }                                                               \
1344         spin_unlock(&t10_wwn->t10_vpd_lock);                            \
1345                                                                         \
1346         return len;                                                     \
1347 }
1348
1349 /* VPD page 0x83 Association: Logical Unit */
1350 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_logical_unit, 0x00);
1351 /* VPD page 0x83 Association: Target Port */
1352 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_target_port, 0x10);
1353 /* VPD page 0x83 Association: SCSI Target Device */
1354 DEF_DEV_WWN_ASSOC_SHOW(vpd_assoc_scsi_target_device, 0x20);
1355
1356 CONFIGFS_ATTR(target_wwn_, vpd_unit_serial);
1357 CONFIGFS_ATTR_RO(target_wwn_, vpd_protocol_identifier);
1358 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_logical_unit);
1359 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_target_port);
1360 CONFIGFS_ATTR_RO(target_wwn_, vpd_assoc_scsi_target_device);
1361
1362 static struct configfs_attribute *target_core_dev_wwn_attrs[] = {
1363         &target_wwn_attr_vpd_unit_serial,
1364         &target_wwn_attr_vpd_protocol_identifier,
1365         &target_wwn_attr_vpd_assoc_logical_unit,
1366         &target_wwn_attr_vpd_assoc_target_port,
1367         &target_wwn_attr_vpd_assoc_scsi_target_device,
1368         NULL,
1369 };
1370
1371 TB_CIT_SETUP(dev_wwn, NULL, NULL, target_core_dev_wwn_attrs);
1372
1373 /*  End functions for struct config_item_type tb_dev_wwn_cit */
1374
1375 /*  Start functions for struct config_item_type tb_dev_pr_cit */
1376
1377 static struct se_device *pr_to_dev(struct config_item *item)
1378 {
1379         return container_of(to_config_group(item), struct se_device,
1380                         dev_pr_group);
1381 }
1382
1383 static ssize_t target_core_dev_pr_show_spc3_res(struct se_device *dev,
1384                 char *page)
1385 {
1386         struct se_node_acl *se_nacl;
1387         struct t10_pr_registration *pr_reg;
1388         char i_buf[PR_REG_ISID_ID_LEN];
1389
1390         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1391
1392         pr_reg = dev->dev_pr_res_holder;
1393         if (!pr_reg)
1394                 return sprintf(page, "No SPC-3 Reservation holder\n");
1395
1396         se_nacl = pr_reg->pr_reg_nacl;
1397         core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1398
1399         return sprintf(page, "SPC-3 Reservation: %s Initiator: %s%s\n",
1400                 se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1401                 se_nacl->initiatorname, i_buf);
1402 }
1403
1404 static ssize_t target_core_dev_pr_show_spc2_res(struct se_device *dev,
1405                 char *page)
1406 {
1407         struct se_node_acl *se_nacl;
1408         ssize_t len;
1409
1410         se_nacl = dev->dev_reserved_node_acl;
1411         if (se_nacl) {
1412                 len = sprintf(page,
1413                               "SPC-2 Reservation: %s Initiator: %s\n",
1414                               se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
1415                               se_nacl->initiatorname);
1416         } else {
1417                 len = sprintf(page, "No SPC-2 Reservation holder\n");
1418         }
1419         return len;
1420 }
1421
1422 static ssize_t target_pr_res_holder_show(struct config_item *item, char *page)
1423 {
1424         struct se_device *dev = pr_to_dev(item);
1425         int ret;
1426
1427         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1428                 return sprintf(page, "Passthrough\n");
1429
1430         spin_lock(&dev->dev_reservation_lock);
1431         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1432                 ret = target_core_dev_pr_show_spc2_res(dev, page);
1433         else
1434                 ret = target_core_dev_pr_show_spc3_res(dev, page);
1435         spin_unlock(&dev->dev_reservation_lock);
1436         return ret;
1437 }
1438
1439 static ssize_t target_pr_res_pr_all_tgt_pts_show(struct config_item *item,
1440                 char *page)
1441 {
1442         struct se_device *dev = pr_to_dev(item);
1443         ssize_t len = 0;
1444
1445         spin_lock(&dev->dev_reservation_lock);
1446         if (!dev->dev_pr_res_holder) {
1447                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1448         } else if (dev->dev_pr_res_holder->pr_reg_all_tg_pt) {
1449                 len = sprintf(page, "SPC-3 Reservation: All Target"
1450                         " Ports registration\n");
1451         } else {
1452                 len = sprintf(page, "SPC-3 Reservation: Single"
1453                         " Target Port registration\n");
1454         }
1455
1456         spin_unlock(&dev->dev_reservation_lock);
1457         return len;
1458 }
1459
1460 static ssize_t target_pr_res_pr_generation_show(struct config_item *item,
1461                 char *page)
1462 {
1463         return sprintf(page, "0x%08x\n", pr_to_dev(item)->t10_pr.pr_generation);
1464 }
1465
1466
1467 static ssize_t target_pr_res_pr_holder_tg_port_show(struct config_item *item,
1468                 char *page)
1469 {
1470         struct se_device *dev = pr_to_dev(item);
1471         struct se_node_acl *se_nacl;
1472         struct se_portal_group *se_tpg;
1473         struct t10_pr_registration *pr_reg;
1474         const struct target_core_fabric_ops *tfo;
1475         ssize_t len = 0;
1476
1477         spin_lock(&dev->dev_reservation_lock);
1478         pr_reg = dev->dev_pr_res_holder;
1479         if (!pr_reg) {
1480                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1481                 goto out_unlock;
1482         }
1483
1484         se_nacl = pr_reg->pr_reg_nacl;
1485         se_tpg = se_nacl->se_tpg;
1486         tfo = se_tpg->se_tpg_tfo;
1487
1488         len += sprintf(page+len, "SPC-3 Reservation: %s"
1489                 " Target Node Endpoint: %s\n", tfo->get_fabric_name(),
1490                 tfo->tpg_get_wwn(se_tpg));
1491         len += sprintf(page+len, "SPC-3 Reservation: Relative Port"
1492                 " Identifier Tag: %hu %s Portal Group Tag: %hu"
1493                 " %s Logical Unit: %llu\n", pr_reg->tg_pt_sep_rtpi,
1494                 tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),
1495                 tfo->get_fabric_name(), pr_reg->pr_aptpl_target_lun);
1496
1497 out_unlock:
1498         spin_unlock(&dev->dev_reservation_lock);
1499         return len;
1500 }
1501
1502
1503 static ssize_t target_pr_res_pr_registered_i_pts_show(struct config_item *item,
1504                 char *page)
1505 {
1506         struct se_device *dev = pr_to_dev(item);
1507         const struct target_core_fabric_ops *tfo;
1508         struct t10_pr_registration *pr_reg;
1509         unsigned char buf[384];
1510         char i_buf[PR_REG_ISID_ID_LEN];
1511         ssize_t len = 0;
1512         int reg_count = 0;
1513
1514         len += sprintf(page+len, "SPC-3 PR Registrations:\n");
1515
1516         spin_lock(&dev->t10_pr.registration_lock);
1517         list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1518                         pr_reg_list) {
1519
1520                 memset(buf, 0, 384);
1521                 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1522                 tfo = pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1523                 core_pr_dump_initiator_port(pr_reg, i_buf,
1524                                         PR_REG_ISID_ID_LEN);
1525                 sprintf(buf, "%s Node: %s%s Key: 0x%016Lx PRgen: 0x%08x\n",
1526                         tfo->get_fabric_name(),
1527                         pr_reg->pr_reg_nacl->initiatorname, i_buf, pr_reg->pr_res_key,
1528                         pr_reg->pr_res_generation);
1529
1530                 if (len + strlen(buf) >= PAGE_SIZE)
1531                         break;
1532
1533                 len += sprintf(page+len, "%s", buf);
1534                 reg_count++;
1535         }
1536         spin_unlock(&dev->t10_pr.registration_lock);
1537
1538         if (!reg_count)
1539                 len += sprintf(page+len, "None\n");
1540
1541         return len;
1542 }
1543
1544 static ssize_t target_pr_res_pr_type_show(struct config_item *item, char *page)
1545 {
1546         struct se_device *dev = pr_to_dev(item);
1547         struct t10_pr_registration *pr_reg;
1548         ssize_t len = 0;
1549
1550         spin_lock(&dev->dev_reservation_lock);
1551         pr_reg = dev->dev_pr_res_holder;
1552         if (pr_reg) {
1553                 len = sprintf(page, "SPC-3 Reservation Type: %s\n",
1554                         core_scsi3_pr_dump_type(pr_reg->pr_res_type));
1555         } else {
1556                 len = sprintf(page, "No SPC-3 Reservation holder\n");
1557         }
1558
1559         spin_unlock(&dev->dev_reservation_lock);
1560         return len;
1561 }
1562
1563 static ssize_t target_pr_res_type_show(struct config_item *item, char *page)
1564 {
1565         struct se_device *dev = pr_to_dev(item);
1566
1567         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1568                 return sprintf(page, "SPC_PASSTHROUGH\n");
1569         else if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1570                 return sprintf(page, "SPC2_RESERVATIONS\n");
1571         else
1572                 return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");
1573 }
1574
1575 static ssize_t target_pr_res_aptpl_active_show(struct config_item *item,
1576                 char *page)
1577 {
1578         struct se_device *dev = pr_to_dev(item);
1579
1580         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1581                 return 0;
1582
1583         return sprintf(page, "APTPL Bit Status: %s\n",
1584                 (dev->t10_pr.pr_aptpl_active) ? "Activated" : "Disabled");
1585 }
1586
1587 static ssize_t target_pr_res_aptpl_metadata_show(struct config_item *item,
1588                 char *page)
1589 {
1590         struct se_device *dev = pr_to_dev(item);
1591
1592         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1593                 return 0;
1594
1595         return sprintf(page, "Ready to process PR APTPL metadata..\n");
1596 }
1597
1598 enum {
1599         Opt_initiator_fabric, Opt_initiator_node, Opt_initiator_sid,
1600         Opt_sa_res_key, Opt_res_holder, Opt_res_type, Opt_res_scope,
1601         Opt_res_all_tg_pt, Opt_mapped_lun, Opt_target_fabric,
1602         Opt_target_node, Opt_tpgt, Opt_port_rtpi, Opt_target_lun, Opt_err
1603 };
1604
1605 static match_table_t tokens = {
1606         {Opt_initiator_fabric, "initiator_fabric=%s"},
1607         {Opt_initiator_node, "initiator_node=%s"},
1608         {Opt_initiator_sid, "initiator_sid=%s"},
1609         {Opt_sa_res_key, "sa_res_key=%s"},
1610         {Opt_res_holder, "res_holder=%d"},
1611         {Opt_res_type, "res_type=%d"},
1612         {Opt_res_scope, "res_scope=%d"},
1613         {Opt_res_all_tg_pt, "res_all_tg_pt=%d"},
1614         {Opt_mapped_lun, "mapped_lun=%u"},
1615         {Opt_target_fabric, "target_fabric=%s"},
1616         {Opt_target_node, "target_node=%s"},
1617         {Opt_tpgt, "tpgt=%d"},
1618         {Opt_port_rtpi, "port_rtpi=%d"},
1619         {Opt_target_lun, "target_lun=%u"},
1620         {Opt_err, NULL}
1621 };
1622
1623 static ssize_t target_pr_res_aptpl_metadata_store(struct config_item *item,
1624                 const char *page, size_t count)
1625 {
1626         struct se_device *dev = pr_to_dev(item);
1627         unsigned char *i_fabric = NULL, *i_port = NULL, *isid = NULL;
1628         unsigned char *t_fabric = NULL, *t_port = NULL;
1629         char *orig, *ptr, *opts;
1630         substring_t args[MAX_OPT_ARGS];
1631         unsigned long long tmp_ll;
1632         u64 sa_res_key = 0;
1633         u64 mapped_lun = 0, target_lun = 0;
1634         int ret = -1, res_holder = 0, all_tg_pt = 0, arg, token;
1635         u16 tpgt = 0;
1636         u8 type = 0;
1637
1638         if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
1639                 return count;
1640         if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
1641                 return count;
1642
1643         if (dev->export_count) {
1644                 pr_debug("Unable to process APTPL metadata while"
1645                         " active fabric exports exist\n");
1646                 return -EINVAL;
1647         }
1648
1649         opts = kstrdup(page, GFP_KERNEL);
1650         if (!opts)
1651                 return -ENOMEM;
1652
1653         orig = opts;
1654         while ((ptr = strsep(&opts, ",\n")) != NULL) {
1655                 if (!*ptr)
1656                         continue;
1657
1658                 token = match_token(ptr, tokens, args);
1659                 switch (token) {
1660                 case Opt_initiator_fabric:
1661                         i_fabric = match_strdup(args);
1662                         if (!i_fabric) {
1663                                 ret = -ENOMEM;
1664                                 goto out;
1665                         }
1666                         break;
1667                 case Opt_initiator_node:
1668                         i_port = match_strdup(args);
1669                         if (!i_port) {
1670                                 ret = -ENOMEM;
1671                                 goto out;
1672                         }
1673                         if (strlen(i_port) >= PR_APTPL_MAX_IPORT_LEN) {
1674                                 pr_err("APTPL metadata initiator_node="
1675                                         " exceeds PR_APTPL_MAX_IPORT_LEN: %d\n",
1676                                         PR_APTPL_MAX_IPORT_LEN);
1677                                 ret = -EINVAL;
1678                                 break;
1679                         }
1680                         break;
1681                 case Opt_initiator_sid:
1682                         isid = match_strdup(args);
1683                         if (!isid) {
1684                                 ret = -ENOMEM;
1685                                 goto out;
1686                         }
1687                         if (strlen(isid) >= PR_REG_ISID_LEN) {
1688                                 pr_err("APTPL metadata initiator_isid"
1689                                         "= exceeds PR_REG_ISID_LEN: %d\n",
1690                                         PR_REG_ISID_LEN);
1691                                 ret = -EINVAL;
1692                                 break;
1693                         }
1694                         break;
1695                 case Opt_sa_res_key:
1696                         ret = match_u64(args,  &tmp_ll);
1697                         if (ret < 0) {
1698                                 pr_err("kstrtoull() failed for sa_res_key=\n");
1699                                 goto out;
1700                         }
1701                         sa_res_key = (u64)tmp_ll;
1702                         break;
1703                 /*
1704                  * PR APTPL Metadata for Reservation
1705                  */
1706                 case Opt_res_holder:
1707                         ret = match_int(args, &arg);
1708                         if (ret)
1709                                 goto out;
1710                         res_holder = arg;
1711                         break;
1712                 case Opt_res_type:
1713                         ret = match_int(args, &arg);
1714                         if (ret)
1715                                 goto out;
1716                         type = (u8)arg;
1717                         break;
1718                 case Opt_res_scope:
1719                         ret = match_int(args, &arg);
1720                         if (ret)
1721                                 goto out;
1722                         break;
1723                 case Opt_res_all_tg_pt:
1724                         ret = match_int(args, &arg);
1725                         if (ret)
1726                                 goto out;
1727                         all_tg_pt = (int)arg;
1728                         break;
1729                 case Opt_mapped_lun:
1730                         ret = match_u64(args, &tmp_ll);
1731                         if (ret)
1732                                 goto out;
1733                         mapped_lun = (u64)tmp_ll;
1734                         break;
1735                 /*
1736                  * PR APTPL Metadata for Target Port
1737                  */
1738                 case Opt_target_fabric:
1739                         t_fabric = match_strdup(args);
1740                         if (!t_fabric) {
1741                                 ret = -ENOMEM;
1742                                 goto out;
1743                         }
1744                         break;
1745                 case Opt_target_node:
1746                         t_port = match_strdup(args);
1747                         if (!t_port) {
1748                                 ret = -ENOMEM;
1749                                 goto out;
1750                         }
1751                         if (strlen(t_port) >= PR_APTPL_MAX_TPORT_LEN) {
1752                                 pr_err("APTPL metadata target_node="
1753                                         " exceeds PR_APTPL_MAX_TPORT_LEN: %d\n",
1754                                         PR_APTPL_MAX_TPORT_LEN);
1755                                 ret = -EINVAL;
1756                                 break;
1757                         }
1758                         break;
1759                 case Opt_tpgt:
1760                         ret = match_int(args, &arg);
1761                         if (ret)
1762                                 goto out;
1763                         tpgt = (u16)arg;
1764                         break;
1765                 case Opt_port_rtpi:
1766                         ret = match_int(args, &arg);
1767                         if (ret)
1768                                 goto out;
1769                         break;
1770                 case Opt_target_lun:
1771                         ret = match_u64(args, &tmp_ll);
1772                         if (ret)
1773                                 goto out;
1774                         target_lun = (u64)tmp_ll;
1775                         break;
1776                 default:
1777                         break;
1778                 }
1779         }
1780
1781         if (!i_port || !t_port || !sa_res_key) {
1782                 pr_err("Illegal parameters for APTPL registration\n");
1783                 ret = -EINVAL;
1784                 goto out;
1785         }
1786
1787         if (res_holder && !(type)) {
1788                 pr_err("Illegal PR type: 0x%02x for reservation"
1789                                 " holder\n", type);
1790                 ret = -EINVAL;
1791                 goto out;
1792         }
1793
1794         ret = core_scsi3_alloc_aptpl_registration(&dev->t10_pr, sa_res_key,
1795                         i_port, isid, mapped_lun, t_port, tpgt, target_lun,
1796                         res_holder, all_tg_pt, type);
1797 out:
1798         kfree(i_fabric);
1799         kfree(i_port);
1800         kfree(isid);
1801         kfree(t_fabric);
1802         kfree(t_port);
1803         kfree(orig);
1804         return (ret == 0) ? count : ret;
1805 }
1806
1807
1808 CONFIGFS_ATTR_RO(target_pr_, res_holder);
1809 CONFIGFS_ATTR_RO(target_pr_, res_pr_all_tgt_pts);
1810 CONFIGFS_ATTR_RO(target_pr_, res_pr_generation);
1811 CONFIGFS_ATTR_RO(target_pr_, res_pr_holder_tg_port);
1812 CONFIGFS_ATTR_RO(target_pr_, res_pr_registered_i_pts);
1813 CONFIGFS_ATTR_RO(target_pr_, res_pr_type);
1814 CONFIGFS_ATTR_RO(target_pr_, res_type);
1815 CONFIGFS_ATTR_RO(target_pr_, res_aptpl_active);
1816 CONFIGFS_ATTR(target_pr_, res_aptpl_metadata);
1817
1818 static struct configfs_attribute *target_core_dev_pr_attrs[] = {
1819         &target_pr_attr_res_holder,
1820         &target_pr_attr_res_pr_all_tgt_pts,
1821         &target_pr_attr_res_pr_generation,
1822         &target_pr_attr_res_pr_holder_tg_port,
1823         &target_pr_attr_res_pr_registered_i_pts,
1824         &target_pr_attr_res_pr_type,
1825         &target_pr_attr_res_type,
1826         &target_pr_attr_res_aptpl_active,
1827         &target_pr_attr_res_aptpl_metadata,
1828         NULL,
1829 };
1830
1831 TB_CIT_SETUP(dev_pr, NULL, NULL, target_core_dev_pr_attrs);
1832
1833 /*  End functions for struct config_item_type tb_dev_pr_cit */
1834
1835 /*  Start functions for struct config_item_type tb_dev_cit */
1836
1837 static inline struct se_device *to_device(struct config_item *item)
1838 {
1839         return container_of(to_config_group(item), struct se_device, dev_group);
1840 }
1841
1842 static ssize_t target_dev_info_show(struct config_item *item, char *page)
1843 {
1844         struct se_device *dev = to_device(item);
1845         int bl = 0;
1846         ssize_t read_bytes = 0;
1847
1848         transport_dump_dev_state(dev, page, &bl);
1849         read_bytes += bl;
1850         read_bytes += dev->transport->show_configfs_dev_params(dev,
1851                         page+read_bytes);
1852         return read_bytes;
1853 }
1854
1855 static ssize_t target_dev_control_store(struct config_item *item,
1856                 const char *page, size_t count)
1857 {
1858         struct se_device *dev = to_device(item);
1859
1860         return dev->transport->set_configfs_dev_params(dev, page, count);
1861 }
1862
1863 static ssize_t target_dev_alias_show(struct config_item *item, char *page)
1864 {
1865         struct se_device *dev = to_device(item);
1866
1867         if (!(dev->dev_flags & DF_USING_ALIAS))
1868                 return 0;
1869
1870         return snprintf(page, PAGE_SIZE, "%s\n", dev->dev_alias);
1871 }
1872
1873 static ssize_t target_dev_alias_store(struct config_item *item,
1874                 const char *page, size_t count)
1875 {
1876         struct se_device *dev = to_device(item);
1877         struct se_hba *hba = dev->se_hba;
1878         ssize_t read_bytes;
1879
1880         if (count > (SE_DEV_ALIAS_LEN-1)) {
1881                 pr_err("alias count: %d exceeds"
1882                         " SE_DEV_ALIAS_LEN-1: %u\n", (int)count,
1883                         SE_DEV_ALIAS_LEN-1);
1884                 return -EINVAL;
1885         }
1886
1887         read_bytes = snprintf(&dev->dev_alias[0], SE_DEV_ALIAS_LEN, "%s", page);
1888         if (!read_bytes)
1889                 return -EINVAL;
1890         if (dev->dev_alias[read_bytes - 1] == '\n')
1891                 dev->dev_alias[read_bytes - 1] = '\0';
1892
1893         dev->dev_flags |= DF_USING_ALIAS;
1894
1895         pr_debug("Target_Core_ConfigFS: %s/%s set alias: %s\n",
1896                 config_item_name(&hba->hba_group.cg_item),
1897                 config_item_name(&dev->dev_group.cg_item),
1898                 dev->dev_alias);
1899
1900         return read_bytes;
1901 }
1902
1903 static ssize_t target_dev_udev_path_show(struct config_item *item, char *page)
1904 {
1905         struct se_device *dev = to_device(item);
1906
1907         if (!(dev->dev_flags & DF_USING_UDEV_PATH))
1908                 return 0;
1909
1910         return snprintf(page, PAGE_SIZE, "%s\n", dev->udev_path);
1911 }
1912
1913 static ssize_t target_dev_udev_path_store(struct config_item *item,
1914                 const char *page, size_t count)
1915 {
1916         struct se_device *dev = to_device(item);
1917         struct se_hba *hba = dev->se_hba;
1918         ssize_t read_bytes;
1919
1920         if (count > (SE_UDEV_PATH_LEN-1)) {
1921                 pr_err("udev_path count: %d exceeds"
1922                         " SE_UDEV_PATH_LEN-1: %u\n", (int)count,
1923                         SE_UDEV_PATH_LEN-1);
1924                 return -EINVAL;
1925         }
1926
1927         read_bytes = snprintf(&dev->udev_path[0], SE_UDEV_PATH_LEN,
1928                         "%s", page);
1929         if (!read_bytes)
1930                 return -EINVAL;
1931         if (dev->udev_path[read_bytes - 1] == '\n')
1932                 dev->udev_path[read_bytes - 1] = '\0';
1933
1934         dev->dev_flags |= DF_USING_UDEV_PATH;
1935
1936         pr_debug("Target_Core_ConfigFS: %s/%s set udev_path: %s\n",
1937                 config_item_name(&hba->hba_group.cg_item),
1938                 config_item_name(&dev->dev_group.cg_item),
1939                 dev->udev_path);
1940
1941         return read_bytes;
1942 }
1943
1944 static ssize_t target_dev_enable_show(struct config_item *item, char *page)
1945 {
1946         struct se_device *dev = to_device(item);
1947
1948         return snprintf(page, PAGE_SIZE, "%d\n", !!(dev->dev_flags & DF_CONFIGURED));
1949 }
1950
1951 static ssize_t target_dev_enable_store(struct config_item *item,
1952                 const char *page, size_t count)
1953 {
1954         struct se_device *dev = to_device(item);
1955         char *ptr;
1956         int ret;
1957
1958         ptr = strstr(page, "1");
1959         if (!ptr) {
1960                 pr_err("For dev_enable ops, only valid value"
1961                                 " is \"1\"\n");
1962                 return -EINVAL;
1963         }
1964
1965         ret = target_configure_device(dev);
1966         if (ret)
1967                 return ret;
1968         return count;
1969 }
1970
1971 static ssize_t target_dev_alua_lu_gp_show(struct config_item *item, char *page)
1972 {
1973         struct se_device *dev = to_device(item);
1974         struct config_item *lu_ci;
1975         struct t10_alua_lu_gp *lu_gp;
1976         struct t10_alua_lu_gp_member *lu_gp_mem;
1977         ssize_t len = 0;
1978
1979         lu_gp_mem = dev->dev_alua_lu_gp_mem;
1980         if (!lu_gp_mem)
1981                 return 0;
1982
1983         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1984         lu_gp = lu_gp_mem->lu_gp;
1985         if (lu_gp) {
1986                 lu_ci = &lu_gp->lu_gp_group.cg_item;
1987                 len += sprintf(page, "LU Group Alias: %s\nLU Group ID: %hu\n",
1988                         config_item_name(lu_ci), lu_gp->lu_gp_id);
1989         }
1990         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1991
1992         return len;
1993 }
1994
1995 static ssize_t target_dev_alua_lu_gp_store(struct config_item *item,
1996                 const char *page, size_t count)
1997 {
1998         struct se_device *dev = to_device(item);
1999         struct se_hba *hba = dev->se_hba;
2000         struct t10_alua_lu_gp *lu_gp = NULL, *lu_gp_new = NULL;
2001         struct t10_alua_lu_gp_member *lu_gp_mem;
2002         unsigned char buf[LU_GROUP_NAME_BUF];
2003         int move = 0;
2004
2005         lu_gp_mem = dev->dev_alua_lu_gp_mem;
2006         if (!lu_gp_mem)
2007                 return count;
2008
2009         if (count > LU_GROUP_NAME_BUF) {
2010                 pr_err("ALUA LU Group Alias too large!\n");
2011                 return -EINVAL;
2012         }
2013         memset(buf, 0, LU_GROUP_NAME_BUF);
2014         memcpy(buf, page, count);
2015         /*
2016          * Any ALUA logical unit alias besides "NULL" means we will be
2017          * making a new group association.
2018          */
2019         if (strcmp(strstrip(buf), "NULL")) {
2020                 /*
2021                  * core_alua_get_lu_gp_by_name() will increment reference to
2022                  * struct t10_alua_lu_gp.  This reference is released with
2023                  * core_alua_get_lu_gp_by_name below().
2024                  */
2025                 lu_gp_new = core_alua_get_lu_gp_by_name(strstrip(buf));
2026                 if (!lu_gp_new)
2027                         return -ENODEV;
2028         }
2029
2030         spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2031         lu_gp = lu_gp_mem->lu_gp;
2032         if (lu_gp) {
2033                 /*
2034                  * Clearing an existing lu_gp association, and replacing
2035                  * with NULL
2036                  */
2037                 if (!lu_gp_new) {
2038                         pr_debug("Target_Core_ConfigFS: Releasing %s/%s"
2039                                 " from ALUA LU Group: core/alua/lu_gps/%s, ID:"
2040                                 " %hu\n",
2041                                 config_item_name(&hba->hba_group.cg_item),
2042                                 config_item_name(&dev->dev_group.cg_item),
2043                                 config_item_name(&lu_gp->lu_gp_group.cg_item),
2044                                 lu_gp->lu_gp_id);
2045
2046                         __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2047                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2048
2049                         return count;
2050                 }
2051                 /*
2052                  * Removing existing association of lu_gp_mem with lu_gp
2053                  */
2054                 __core_alua_drop_lu_gp_mem(lu_gp_mem, lu_gp);
2055                 move = 1;
2056         }
2057         /*
2058          * Associate lu_gp_mem with lu_gp_new.
2059          */
2060         __core_alua_attach_lu_gp_mem(lu_gp_mem, lu_gp_new);
2061         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2062
2063         pr_debug("Target_Core_ConfigFS: %s %s/%s to ALUA LU Group:"
2064                 " core/alua/lu_gps/%s, ID: %hu\n",
2065                 (move) ? "Moving" : "Adding",
2066                 config_item_name(&hba->hba_group.cg_item),
2067                 config_item_name(&dev->dev_group.cg_item),
2068                 config_item_name(&lu_gp_new->lu_gp_group.cg_item),
2069                 lu_gp_new->lu_gp_id);
2070
2071         core_alua_put_lu_gp_from_name(lu_gp_new);
2072         return count;
2073 }
2074
2075 static ssize_t target_dev_lba_map_show(struct config_item *item, char *page)
2076 {
2077         struct se_device *dev = to_device(item);
2078         struct t10_alua_lba_map *map;
2079         struct t10_alua_lba_map_member *mem;
2080         char *b = page;
2081         int bl = 0;
2082         char state;
2083
2084         spin_lock(&dev->t10_alua.lba_map_lock);
2085         if (!list_empty(&dev->t10_alua.lba_map_list))
2086             bl += sprintf(b + bl, "%u %u\n",
2087                           dev->t10_alua.lba_map_segment_size,
2088                           dev->t10_alua.lba_map_segment_multiplier);
2089         list_for_each_entry(map, &dev->t10_alua.lba_map_list, lba_map_list) {
2090                 bl += sprintf(b + bl, "%llu %llu",
2091                               map->lba_map_first_lba, map->lba_map_last_lba);
2092                 list_for_each_entry(mem, &map->lba_map_mem_list,
2093                                     lba_map_mem_list) {
2094                         switch (mem->lba_map_mem_alua_state) {
2095                         case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
2096                                 state = 'O';
2097                                 break;
2098                         case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
2099                                 state = 'A';
2100                                 break;
2101                         case ALUA_ACCESS_STATE_STANDBY:
2102                                 state = 'S';
2103                                 break;
2104                         case ALUA_ACCESS_STATE_UNAVAILABLE:
2105                                 state = 'U';
2106                                 break;
2107                         default:
2108                                 state = '.';
2109                                 break;
2110                         }
2111                         bl += sprintf(b + bl, " %d:%c",
2112                                       mem->lba_map_mem_alua_pg_id, state);
2113                 }
2114                 bl += sprintf(b + bl, "\n");
2115         }
2116         spin_unlock(&dev->t10_alua.lba_map_lock);
2117         return bl;
2118 }
2119
2120 static ssize_t target_dev_lba_map_store(struct config_item *item,
2121                 const char *page, size_t count)
2122 {
2123         struct se_device *dev = to_device(item);
2124         struct t10_alua_lba_map *lba_map = NULL;
2125         struct list_head lba_list;
2126         char *map_entries, *orig, *ptr;
2127         char state;
2128         int pg_num = -1, pg;
2129         int ret = 0, num = 0, pg_id, alua_state;
2130         unsigned long start_lba = -1, end_lba = -1;
2131         unsigned long segment_size = -1, segment_mult = -1;
2132
2133         orig = map_entries = kstrdup(page, GFP_KERNEL);
2134         if (!map_entries)
2135                 return -ENOMEM;
2136
2137         INIT_LIST_HEAD(&lba_list);
2138         while ((ptr = strsep(&map_entries, "\n")) != NULL) {
2139                 if (!*ptr)
2140                         continue;
2141
2142                 if (num == 0) {
2143                         if (sscanf(ptr, "%lu %lu\n",
2144                                    &segment_size, &segment_mult) != 2) {
2145                                 pr_err("Invalid line %d\n", num);
2146                                 ret = -EINVAL;
2147                                 break;
2148                         }
2149                         num++;
2150                         continue;
2151                 }
2152                 if (sscanf(ptr, "%lu %lu", &start_lba, &end_lba) != 2) {
2153                         pr_err("Invalid line %d\n", num);
2154                         ret = -EINVAL;
2155                         break;
2156                 }
2157                 ptr = strchr(ptr, ' ');
2158                 if (!ptr) {
2159                         pr_err("Invalid line %d, missing end lba\n", num);
2160                         ret = -EINVAL;
2161                         break;
2162                 }
2163                 ptr++;
2164                 ptr = strchr(ptr, ' ');
2165                 if (!ptr) {
2166                         pr_err("Invalid line %d, missing state definitions\n",
2167                                num);
2168                         ret = -EINVAL;
2169                         break;
2170                 }
2171                 ptr++;
2172                 lba_map = core_alua_allocate_lba_map(&lba_list,
2173                                                      start_lba, end_lba);
2174                 if (IS_ERR(lba_map)) {
2175                         ret = PTR_ERR(lba_map);
2176                         break;
2177                 }
2178                 pg = 0;
2179                 while (sscanf(ptr, "%d:%c", &pg_id, &state) == 2) {
2180                         switch (state) {
2181                         case 'O':
2182                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
2183                                 break;
2184                         case 'A':
2185                                 alua_state = ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED;
2186                                 break;
2187                         case 'S':
2188                                 alua_state = ALUA_ACCESS_STATE_STANDBY;
2189                                 break;
2190                         case 'U':
2191                                 alua_state = ALUA_ACCESS_STATE_UNAVAILABLE;
2192                                 break;
2193                         default:
2194                                 pr_err("Invalid ALUA state '%c'\n", state);
2195                                 ret = -EINVAL;
2196                                 goto out;
2197                         }
2198
2199                         ret = core_alua_allocate_lba_map_mem(lba_map,
2200                                                              pg_id, alua_state);
2201                         if (ret) {
2202                                 pr_err("Invalid target descriptor %d:%c "
2203                                        "at line %d\n",
2204                                        pg_id, state, num);
2205                                 break;
2206                         }
2207                         pg++;
2208                         ptr = strchr(ptr, ' ');
2209                         if (ptr)
2210                                 ptr++;
2211                         else
2212                                 break;
2213                 }
2214                 if (pg_num == -1)
2215                     pg_num = pg;
2216                 else if (pg != pg_num) {
2217                         pr_err("Only %d from %d port groups definitions "
2218                                "at line %d\n", pg, pg_num, num);
2219                         ret = -EINVAL;
2220                         break;
2221                 }
2222                 num++;
2223         }
2224 out:
2225         if (ret) {
2226                 core_alua_free_lba_map(&lba_list);
2227                 count = ret;
2228         } else
2229                 core_alua_set_lba_map(dev, &lba_list,
2230                                       segment_size, segment_mult);
2231         kfree(orig);
2232         return count;
2233 }
2234
2235 CONFIGFS_ATTR_RO(target_dev_, info);
2236 CONFIGFS_ATTR_WO(target_dev_, control);
2237 CONFIGFS_ATTR(target_dev_, alias);
2238 CONFIGFS_ATTR(target_dev_, udev_path);
2239 CONFIGFS_ATTR(target_dev_, enable);
2240 CONFIGFS_ATTR(target_dev_, alua_lu_gp);
2241 CONFIGFS_ATTR(target_dev_, lba_map);
2242
2243 static struct configfs_attribute *target_core_dev_attrs[] = {
2244         &target_dev_attr_info,
2245         &target_dev_attr_control,
2246         &target_dev_attr_alias,
2247         &target_dev_attr_udev_path,
2248         &target_dev_attr_enable,
2249         &target_dev_attr_alua_lu_gp,
2250         &target_dev_attr_lba_map,
2251         NULL,
2252 };
2253
2254 static void target_core_dev_release(struct config_item *item)
2255 {
2256         struct config_group *dev_cg = to_config_group(item);
2257         struct se_device *dev =
2258                 container_of(dev_cg, struct se_device, dev_group);
2259
2260         target_free_device(dev);
2261 }
2262
2263 /*
2264  * Used in target_core_fabric_configfs.c to verify valid se_device symlink
2265  * within target_fabric_port_link()
2266  */
2267 struct configfs_item_operations target_core_dev_item_ops = {
2268         .release                = target_core_dev_release,
2269 };
2270
2271 TB_CIT_SETUP(dev, &target_core_dev_item_ops, NULL, target_core_dev_attrs);
2272
2273 /* End functions for struct config_item_type tb_dev_cit */
2274
2275 /* Start functions for struct config_item_type target_core_alua_lu_gp_cit */
2276
2277 static inline struct t10_alua_lu_gp *to_lu_gp(struct config_item *item)
2278 {
2279         return container_of(to_config_group(item), struct t10_alua_lu_gp,
2280                         lu_gp_group);
2281 }
2282
2283 static ssize_t target_lu_gp_lu_gp_id_show(struct config_item *item, char *page)
2284 {
2285         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2286
2287         if (!lu_gp->lu_gp_valid_id)
2288                 return 0;
2289         return sprintf(page, "%hu\n", lu_gp->lu_gp_id);
2290 }
2291
2292 static ssize_t target_lu_gp_lu_gp_id_store(struct config_item *item,
2293                 const char *page, size_t count)
2294 {
2295         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2296         struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group;
2297         unsigned long lu_gp_id;
2298         int ret;
2299
2300         ret = kstrtoul(page, 0, &lu_gp_id);
2301         if (ret < 0) {
2302                 pr_err("kstrtoul() returned %d for"
2303                         " lu_gp_id\n", ret);
2304                 return ret;
2305         }
2306         if (lu_gp_id > 0x0000ffff) {
2307                 pr_err("ALUA lu_gp_id: %lu exceeds maximum:"
2308                         " 0x0000ffff\n", lu_gp_id);
2309                 return -EINVAL;
2310         }
2311
2312         ret = core_alua_set_lu_gp_id(lu_gp, (u16)lu_gp_id);
2313         if (ret < 0)
2314                 return -EINVAL;
2315
2316         pr_debug("Target_Core_ConfigFS: Set ALUA Logical Unit"
2317                 " Group: core/alua/lu_gps/%s to ID: %hu\n",
2318                 config_item_name(&alua_lu_gp_cg->cg_item),
2319                 lu_gp->lu_gp_id);
2320
2321         return count;
2322 }
2323
2324 static ssize_t target_lu_gp_members_show(struct config_item *item, char *page)
2325 {
2326         struct t10_alua_lu_gp *lu_gp = to_lu_gp(item);
2327         struct se_device *dev;
2328         struct se_hba *hba;
2329         struct t10_alua_lu_gp_member *lu_gp_mem;
2330         ssize_t len = 0, cur_len;
2331         unsigned char buf[LU_GROUP_NAME_BUF];
2332
2333         memset(buf, 0, LU_GROUP_NAME_BUF);
2334
2335         spin_lock(&lu_gp->lu_gp_lock);
2336         list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
2337                 dev = lu_gp_mem->lu_gp_mem_dev;
2338                 hba = dev->se_hba;
2339
2340                 cur_len = snprintf(buf, LU_GROUP_NAME_BUF, "%s/%s\n",
2341                         config_item_name(&hba->hba_group.cg_item),
2342                         config_item_name(&dev->dev_group.cg_item));
2343                 cur_len++; /* Extra byte for NULL terminator */
2344
2345                 if ((cur_len + len) > PAGE_SIZE) {
2346                         pr_warn("Ran out of lu_gp_show_attr"
2347                                 "_members buffer\n");
2348                         break;
2349                 }
2350                 memcpy(page+len, buf, cur_len);
2351                 len += cur_len;
2352         }
2353         spin_unlock(&lu_gp->lu_gp_lock);
2354
2355         return len;
2356 }
2357
2358 CONFIGFS_ATTR(target_lu_gp_, lu_gp_id);
2359 CONFIGFS_ATTR_RO(target_lu_gp_, members);
2360
2361 static struct configfs_attribute *target_core_alua_lu_gp_attrs[] = {
2362         &target_lu_gp_attr_lu_gp_id,
2363         &target_lu_gp_attr_members,
2364         NULL,
2365 };
2366
2367 static void target_core_alua_lu_gp_release(struct config_item *item)
2368 {
2369         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2370                         struct t10_alua_lu_gp, lu_gp_group);
2371
2372         core_alua_free_lu_gp(lu_gp);
2373 }
2374
2375 static struct configfs_item_operations target_core_alua_lu_gp_ops = {
2376         .release                = target_core_alua_lu_gp_release,
2377 };
2378
2379 static const struct config_item_type target_core_alua_lu_gp_cit = {
2380         .ct_item_ops            = &target_core_alua_lu_gp_ops,
2381         .ct_attrs               = target_core_alua_lu_gp_attrs,
2382         .ct_owner               = THIS_MODULE,
2383 };
2384
2385 /* End functions for struct config_item_type target_core_alua_lu_gp_cit */
2386
2387 /* Start functions for struct config_item_type target_core_alua_lu_gps_cit */
2388
2389 static struct config_group *target_core_alua_create_lu_gp(
2390         struct config_group *group,
2391         const char *name)
2392 {
2393         struct t10_alua_lu_gp *lu_gp;
2394         struct config_group *alua_lu_gp_cg = NULL;
2395         struct config_item *alua_lu_gp_ci = NULL;
2396
2397         lu_gp = core_alua_allocate_lu_gp(name, 0);
2398         if (IS_ERR(lu_gp))
2399                 return NULL;
2400
2401         alua_lu_gp_cg = &lu_gp->lu_gp_group;
2402         alua_lu_gp_ci = &alua_lu_gp_cg->cg_item;
2403
2404         config_group_init_type_name(alua_lu_gp_cg, name,
2405                         &target_core_alua_lu_gp_cit);
2406
2407         pr_debug("Target_Core_ConfigFS: Allocated ALUA Logical Unit"
2408                 " Group: core/alua/lu_gps/%s\n",
2409                 config_item_name(alua_lu_gp_ci));
2410
2411         return alua_lu_gp_cg;
2412
2413 }
2414
2415 static void target_core_alua_drop_lu_gp(
2416         struct config_group *group,
2417         struct config_item *item)
2418 {
2419         struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item),
2420                         struct t10_alua_lu_gp, lu_gp_group);
2421
2422         pr_debug("Target_Core_ConfigFS: Releasing ALUA Logical Unit"
2423                 " Group: core/alua/lu_gps/%s, ID: %hu\n",
2424                 config_item_name(item), lu_gp->lu_gp_id);
2425         /*
2426          * core_alua_free_lu_gp() is called from target_core_alua_lu_gp_ops->release()
2427          * -> target_core_alua_lu_gp_release()
2428          */
2429         config_item_put(item);
2430 }
2431
2432 static struct configfs_group_operations target_core_alua_lu_gps_group_ops = {
2433         .make_group             = &target_core_alua_create_lu_gp,
2434         .drop_item              = &target_core_alua_drop_lu_gp,
2435 };
2436
2437 static const struct config_item_type target_core_alua_lu_gps_cit = {
2438         .ct_item_ops            = NULL,
2439         .ct_group_ops           = &target_core_alua_lu_gps_group_ops,
2440         .ct_owner               = THIS_MODULE,
2441 };
2442
2443 /* End functions for struct config_item_type target_core_alua_lu_gps_cit */
2444
2445 /* Start functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2446
2447 static inline struct t10_alua_tg_pt_gp *to_tg_pt_gp(struct config_item *item)
2448 {
2449         return container_of(to_config_group(item), struct t10_alua_tg_pt_gp,
2450                         tg_pt_gp_group);
2451 }
2452
2453 static ssize_t target_tg_pt_gp_alua_access_state_show(struct config_item *item,
2454                 char *page)
2455 {
2456         return sprintf(page, "%d\n",
2457                        to_tg_pt_gp(item)->tg_pt_gp_alua_access_state);
2458 }
2459
2460 static ssize_t target_tg_pt_gp_alua_access_state_store(struct config_item *item,
2461                 const char *page, size_t count)
2462 {
2463         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2464         struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
2465         unsigned long tmp;
2466         int new_state, ret;
2467
2468         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2469                 pr_err("Unable to do implicit ALUA on non valid"
2470                         " tg_pt_gp ID: %hu\n", tg_pt_gp->tg_pt_gp_valid_id);
2471                 return -EINVAL;
2472         }
2473         if (!(dev->dev_flags & DF_CONFIGURED)) {
2474                 pr_err("Unable to set alua_access_state while device is"
2475                        " not configured\n");
2476                 return -ENODEV;
2477         }
2478
2479         ret = kstrtoul(page, 0, &tmp);
2480         if (ret < 0) {
2481                 pr_err("Unable to extract new ALUA access state from"
2482                                 " %s\n", page);
2483                 return ret;
2484         }
2485         new_state = (int)tmp;
2486
2487         if (!(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)) {
2488                 pr_err("Unable to process implicit configfs ALUA"
2489                         " transition while TPGS_IMPLICIT_ALUA is disabled\n");
2490                 return -EINVAL;
2491         }
2492         if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA &&
2493             new_state == ALUA_ACCESS_STATE_LBA_DEPENDENT) {
2494                 /* LBA DEPENDENT is only allowed with implicit ALUA */
2495                 pr_err("Unable to process implicit configfs ALUA transition"
2496                        " while explicit ALUA management is enabled\n");
2497                 return -EINVAL;
2498         }
2499
2500         ret = core_alua_do_port_transition(tg_pt_gp, dev,
2501                                         NULL, NULL, new_state, 0);
2502         return (!ret) ? count : -EINVAL;
2503 }
2504
2505 static ssize_t target_tg_pt_gp_alua_access_status_show(struct config_item *item,
2506                 char *page)
2507 {
2508         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2509         return sprintf(page, "%s\n",
2510                 core_alua_dump_status(tg_pt_gp->tg_pt_gp_alua_access_status));
2511 }
2512
2513 static ssize_t target_tg_pt_gp_alua_access_status_store(
2514                 struct config_item *item, const char *page, size_t count)
2515 {
2516         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2517         unsigned long tmp;
2518         int new_status, ret;
2519
2520         if (!tg_pt_gp->tg_pt_gp_valid_id) {
2521                 pr_err("Unable to do set ALUA access status on non"
2522                         " valid tg_pt_gp ID: %hu\n",
2523                         tg_pt_gp->tg_pt_gp_valid_id);
2524                 return -EINVAL;
2525         }
2526
2527         ret = kstrtoul(page, 0, &tmp);
2528         if (ret < 0) {
2529                 pr_err("Unable to extract new ALUA access status"
2530                                 " from %s\n", page);
2531                 return ret;
2532         }
2533         new_status = (int)tmp;
2534
2535         if ((new_status != ALUA_STATUS_NONE) &&
2536             (new_status != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2537             (new_status != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2538                 pr_err("Illegal ALUA access status: 0x%02x\n",
2539                                 new_status);
2540                 return -EINVAL;
2541         }
2542
2543         tg_pt_gp->tg_pt_gp_alua_access_status = new_status;
2544         return count;
2545 }
2546
2547 static ssize_t target_tg_pt_gp_alua_access_type_show(struct config_item *item,
2548                 char *page)
2549 {
2550         return core_alua_show_access_type(to_tg_pt_gp(item), page);
2551 }
2552
2553 static ssize_t target_tg_pt_gp_alua_access_type_store(struct config_item *item,
2554                 const char *page, size_t count)
2555 {
2556         return core_alua_store_access_type(to_tg_pt_gp(item), page, count);
2557 }
2558
2559 #define ALUA_SUPPORTED_STATE_ATTR(_name, _bit)                          \
2560 static ssize_t target_tg_pt_gp_alua_support_##_name##_show(             \
2561                 struct config_item *item, char *p)                      \
2562 {                                                                       \
2563         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2564         return sprintf(p, "%d\n",                                       \
2565                 !!(t->tg_pt_gp_alua_supported_states & _bit));          \
2566 }                                                                       \
2567                                                                         \
2568 static ssize_t target_tg_pt_gp_alua_support_##_name##_store(            \
2569                 struct config_item *item, const char *p, size_t c)      \
2570 {                                                                       \
2571         struct t10_alua_tg_pt_gp *t = to_tg_pt_gp(item);                \
2572         unsigned long tmp;                                              \
2573         int ret;                                                        \
2574                                                                         \
2575         if (!t->tg_pt_gp_valid_id) {                                    \
2576                 pr_err("Unable to do set " #_name " ALUA state on non"  \
2577                        " valid tg_pt_gp ID: %hu\n",                     \
2578                        t->tg_pt_gp_valid_id);                           \
2579                 return -EINVAL;                                         \
2580         }                                                               \
2581                                                                         \
2582         ret = kstrtoul(p, 0, &tmp);                                     \
2583         if (ret < 0) {                                                  \
2584                 pr_err("Invalid value '%s', must be '0' or '1'\n", p);  \
2585                 return -EINVAL;                                         \
2586         }                                                               \
2587         if (tmp > 1) {                                                  \
2588                 pr_err("Invalid value '%ld', must be '0' or '1'\n", tmp); \
2589                 return -EINVAL;                                         \
2590         }                                                               \
2591         if (tmp)                                                        \
2592                 t->tg_pt_gp_alua_supported_states |= _bit;              \
2593         else                                                            \
2594                 t->tg_pt_gp_alua_supported_states &= ~_bit;             \
2595                                                                         \
2596         return c;                                                       \
2597 }
2598
2599 ALUA_SUPPORTED_STATE_ATTR(transitioning, ALUA_T_SUP);
2600 ALUA_SUPPORTED_STATE_ATTR(offline, ALUA_O_SUP);
2601 ALUA_SUPPORTED_STATE_ATTR(lba_dependent, ALUA_LBD_SUP);
2602 ALUA_SUPPORTED_STATE_ATTR(unavailable, ALUA_U_SUP);
2603 ALUA_SUPPORTED_STATE_ATTR(standby, ALUA_S_SUP);
2604 ALUA_SUPPORTED_STATE_ATTR(active_optimized, ALUA_AO_SUP);
2605 ALUA_SUPPORTED_STATE_ATTR(active_nonoptimized, ALUA_AN_SUP);
2606
2607 static ssize_t target_tg_pt_gp_alua_write_metadata_show(
2608                 struct config_item *item, char *page)
2609 {
2610         return sprintf(page, "%d\n",
2611                 to_tg_pt_gp(item)->tg_pt_gp_write_metadata);
2612 }
2613
2614 static ssize_t target_tg_pt_gp_alua_write_metadata_store(
2615                 struct config_item *item, const char *page, size_t count)
2616 {
2617         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2618         unsigned long tmp;
2619         int ret;
2620
2621         ret = kstrtoul(page, 0, &tmp);
2622         if (ret < 0) {
2623                 pr_err("Unable to extract alua_write_metadata\n");
2624                 return ret;
2625         }
2626
2627         if ((tmp != 0) && (tmp != 1)) {
2628                 pr_err("Illegal value for alua_write_metadata:"
2629                         " %lu\n", tmp);
2630                 return -EINVAL;
2631         }
2632         tg_pt_gp->tg_pt_gp_write_metadata = (int)tmp;
2633
2634         return count;
2635 }
2636
2637 static ssize_t target_tg_pt_gp_nonop_delay_msecs_show(struct config_item *item,
2638                 char *page)
2639 {
2640         return core_alua_show_nonop_delay_msecs(to_tg_pt_gp(item), page);
2641 }
2642
2643 static ssize_t target_tg_pt_gp_nonop_delay_msecs_store(struct config_item *item,
2644                 const char *page, size_t count)
2645 {
2646         return core_alua_store_nonop_delay_msecs(to_tg_pt_gp(item), page,
2647                         count);
2648 }
2649
2650 static ssize_t target_tg_pt_gp_trans_delay_msecs_show(struct config_item *item,
2651                 char *page)
2652 {
2653         return core_alua_show_trans_delay_msecs(to_tg_pt_gp(item), page);
2654 }
2655
2656 static ssize_t target_tg_pt_gp_trans_delay_msecs_store(struct config_item *item,
2657                 const char *page, size_t count)
2658 {
2659         return core_alua_store_trans_delay_msecs(to_tg_pt_gp(item), page,
2660                         count);
2661 }
2662
2663 static ssize_t target_tg_pt_gp_implicit_trans_secs_show(
2664                 struct config_item *item, char *page)
2665 {
2666         return core_alua_show_implicit_trans_secs(to_tg_pt_gp(item), page);
2667 }
2668
2669 static ssize_t target_tg_pt_gp_implicit_trans_secs_store(
2670                 struct config_item *item, const char *page, size_t count)
2671 {
2672         return core_alua_store_implicit_trans_secs(to_tg_pt_gp(item), page,
2673                         count);
2674 }
2675
2676 static ssize_t target_tg_pt_gp_preferred_show(struct config_item *item,
2677                 char *page)
2678 {
2679         return core_alua_show_preferred_bit(to_tg_pt_gp(item), page);
2680 }
2681
2682 static ssize_t target_tg_pt_gp_preferred_store(struct config_item *item,
2683                 const char *page, size_t count)
2684 {
2685         return core_alua_store_preferred_bit(to_tg_pt_gp(item), page, count);
2686 }
2687
2688 static ssize_t target_tg_pt_gp_tg_pt_gp_id_show(struct config_item *item,
2689                 char *page)
2690 {
2691         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2692
2693         if (!tg_pt_gp->tg_pt_gp_valid_id)
2694                 return 0;
2695         return sprintf(page, "%hu\n", tg_pt_gp->tg_pt_gp_id);
2696 }
2697
2698 static ssize_t target_tg_pt_gp_tg_pt_gp_id_store(struct config_item *item,
2699                 const char *page, size_t count)
2700 {
2701         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2702         struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2703         unsigned long tg_pt_gp_id;
2704         int ret;
2705
2706         ret = kstrtoul(page, 0, &tg_pt_gp_id);
2707         if (ret < 0) {
2708                 pr_err("ALUA tg_pt_gp_id: invalid value '%s' for tg_pt_gp_id\n",
2709                        page);
2710                 return ret;
2711         }
2712         if (tg_pt_gp_id > 0x0000ffff) {
2713                 pr_err("ALUA tg_pt_gp_id: %lu exceeds maximum: 0x0000ffff\n",
2714                        tg_pt_gp_id);
2715                 return -EINVAL;
2716         }
2717
2718         ret = core_alua_set_tg_pt_gp_id(tg_pt_gp, (u16)tg_pt_gp_id);
2719         if (ret < 0)
2720                 return -EINVAL;
2721
2722         pr_debug("Target_Core_ConfigFS: Set ALUA Target Port Group: "
2723                 "core/alua/tg_pt_gps/%s to ID: %hu\n",
2724                 config_item_name(&alua_tg_pt_gp_cg->cg_item),
2725                 tg_pt_gp->tg_pt_gp_id);
2726
2727         return count;
2728 }
2729
2730 static ssize_t target_tg_pt_gp_members_show(struct config_item *item,
2731                 char *page)
2732 {
2733         struct t10_alua_tg_pt_gp *tg_pt_gp = to_tg_pt_gp(item);
2734         struct se_lun *lun;
2735         ssize_t len = 0, cur_len;
2736         unsigned char buf[TG_PT_GROUP_NAME_BUF];
2737
2738         memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2739
2740         spin_lock(&tg_pt_gp->tg_pt_gp_lock);
2741         list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
2742                         lun_tg_pt_gp_link) {
2743                 struct se_portal_group *tpg = lun->lun_tpg;
2744
2745                 cur_len = snprintf(buf, TG_PT_GROUP_NAME_BUF, "%s/%s/tpgt_%hu"
2746                         "/%s\n", tpg->se_tpg_tfo->get_fabric_name(),
2747                         tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2748                         tpg->se_tpg_tfo->tpg_get_tag(tpg),
2749                         config_item_name(&lun->lun_group.cg_item));
2750                 cur_len++; /* Extra byte for NULL terminator */
2751
2752                 if ((cur_len + len) > PAGE_SIZE) {
2753                         pr_warn("Ran out of lu_gp_show_attr"
2754                                 "_members buffer\n");
2755                         break;
2756                 }
2757                 memcpy(page+len, buf, cur_len);
2758                 len += cur_len;
2759         }
2760         spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
2761
2762         return len;
2763 }
2764
2765 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_state);
2766 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_status);
2767 CONFIGFS_ATTR(target_tg_pt_gp_, alua_access_type);
2768 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_transitioning);
2769 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_offline);
2770 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_lba_dependent);
2771 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_unavailable);
2772 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_standby);
2773 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_optimized);
2774 CONFIGFS_ATTR(target_tg_pt_gp_, alua_support_active_nonoptimized);
2775 CONFIGFS_ATTR(target_tg_pt_gp_, alua_write_metadata);
2776 CONFIGFS_ATTR(target_tg_pt_gp_, nonop_delay_msecs);
2777 CONFIGFS_ATTR(target_tg_pt_gp_, trans_delay_msecs);
2778 CONFIGFS_ATTR(target_tg_pt_gp_, implicit_trans_secs);
2779 CONFIGFS_ATTR(target_tg_pt_gp_, preferred);
2780 CONFIGFS_ATTR(target_tg_pt_gp_, tg_pt_gp_id);
2781 CONFIGFS_ATTR_RO(target_tg_pt_gp_, members);
2782
2783 static struct configfs_attribute *target_core_alua_tg_pt_gp_attrs[] = {
2784         &target_tg_pt_gp_attr_alua_access_state,
2785         &target_tg_pt_gp_attr_alua_access_status,
2786         &target_tg_pt_gp_attr_alua_access_type,
2787         &target_tg_pt_gp_attr_alua_support_transitioning,
2788         &target_tg_pt_gp_attr_alua_support_offline,
2789         &target_tg_pt_gp_attr_alua_support_lba_dependent,
2790         &target_tg_pt_gp_attr_alua_support_unavailable,
2791         &target_tg_pt_gp_attr_alua_support_standby,
2792         &target_tg_pt_gp_attr_alua_support_active_nonoptimized,
2793         &target_tg_pt_gp_attr_alua_support_active_optimized,
2794         &target_tg_pt_gp_attr_alua_write_metadata,
2795         &target_tg_pt_gp_attr_nonop_delay_msecs,
2796         &target_tg_pt_gp_attr_trans_delay_msecs,
2797         &target_tg_pt_gp_attr_implicit_trans_secs,
2798         &target_tg_pt_gp_attr_preferred,
2799         &target_tg_pt_gp_attr_tg_pt_gp_id,
2800         &target_tg_pt_gp_attr_members,
2801         NULL,
2802 };
2803
2804 static void target_core_alua_tg_pt_gp_release(struct config_item *item)
2805 {
2806         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2807                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2808
2809         core_alua_free_tg_pt_gp(tg_pt_gp);
2810 }
2811
2812 static struct configfs_item_operations target_core_alua_tg_pt_gp_ops = {
2813         .release                = target_core_alua_tg_pt_gp_release,
2814 };
2815
2816 static const struct config_item_type target_core_alua_tg_pt_gp_cit = {
2817         .ct_item_ops            = &target_core_alua_tg_pt_gp_ops,
2818         .ct_attrs               = target_core_alua_tg_pt_gp_attrs,
2819         .ct_owner               = THIS_MODULE,
2820 };
2821
2822 /* End functions for struct config_item_type target_core_alua_tg_pt_gp_cit */
2823
2824 /* Start functions for struct config_item_type tb_alua_tg_pt_gps_cit */
2825
2826 static struct config_group *target_core_alua_create_tg_pt_gp(
2827         struct config_group *group,
2828         const char *name)
2829 {
2830         struct t10_alua *alua = container_of(group, struct t10_alua,
2831                                         alua_tg_pt_gps_group);
2832         struct t10_alua_tg_pt_gp *tg_pt_gp;
2833         struct config_group *alua_tg_pt_gp_cg = NULL;
2834         struct config_item *alua_tg_pt_gp_ci = NULL;
2835
2836         tg_pt_gp = core_alua_allocate_tg_pt_gp(alua->t10_dev, name, 0);
2837         if (!tg_pt_gp)
2838                 return NULL;
2839
2840         alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group;
2841         alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item;
2842
2843         config_group_init_type_name(alua_tg_pt_gp_cg, name,
2844                         &target_core_alua_tg_pt_gp_cit);
2845
2846         pr_debug("Target_Core_ConfigFS: Allocated ALUA Target Port"
2847                 " Group: alua/tg_pt_gps/%s\n",
2848                 config_item_name(alua_tg_pt_gp_ci));
2849
2850         return alua_tg_pt_gp_cg;
2851 }
2852
2853 static void target_core_alua_drop_tg_pt_gp(
2854         struct config_group *group,
2855         struct config_item *item)
2856 {
2857         struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item),
2858                         struct t10_alua_tg_pt_gp, tg_pt_gp_group);
2859
2860         pr_debug("Target_Core_ConfigFS: Releasing ALUA Target Port"
2861                 " Group: alua/tg_pt_gps/%s, ID: %hu\n",
2862                 config_item_name(item), tg_pt_gp->tg_pt_gp_id);
2863         /*
2864          * core_alua_free_tg_pt_gp() is called from target_core_alua_tg_pt_gp_ops->release()
2865          * -> target_core_alua_tg_pt_gp_release().
2866          */
2867         config_item_put(item);
2868 }
2869
2870 static struct configfs_group_operations target_core_alua_tg_pt_gps_group_ops = {
2871         .make_group             = &target_core_alua_create_tg_pt_gp,
2872         .drop_item              = &target_core_alua_drop_tg_pt_gp,
2873 };
2874
2875 TB_CIT_SETUP(dev_alua_tg_pt_gps, NULL, &target_core_alua_tg_pt_gps_group_ops, NULL);
2876
2877 /* End functions for struct config_item_type tb_alua_tg_pt_gps_cit */
2878
2879 /* Start functions for struct config_item_type target_core_alua_cit */
2880
2881 /*
2882  * target_core_alua_cit is a ConfigFS group that lives under
2883  * /sys/kernel/config/target/core/alua.  There are default groups
2884  * core/alua/lu_gps and core/alua/tg_pt_gps that are attached to
2885  * target_core_alua_cit in target_core_init_configfs() below.
2886  */
2887 static const struct config_item_type target_core_alua_cit = {
2888         .ct_item_ops            = NULL,
2889         .ct_attrs               = NULL,
2890         .ct_owner               = THIS_MODULE,
2891 };
2892
2893 /* End functions for struct config_item_type target_core_alua_cit */
2894
2895 /* Start functions for struct config_item_type tb_dev_stat_cit */
2896
2897 static struct config_group *target_core_stat_mkdir(
2898         struct config_group *group,
2899         const char *name)
2900 {
2901         return ERR_PTR(-ENOSYS);
2902 }
2903
2904 static void target_core_stat_rmdir(
2905         struct config_group *group,
2906         struct config_item *item)
2907 {
2908         return;
2909 }
2910
2911 static struct configfs_group_operations target_core_stat_group_ops = {
2912         .make_group             = &target_core_stat_mkdir,
2913         .drop_item              = &target_core_stat_rmdir,
2914 };
2915
2916 TB_CIT_SETUP(dev_stat, NULL, &target_core_stat_group_ops, NULL);
2917
2918 /* End functions for struct config_item_type tb_dev_stat_cit */
2919
2920 /* Start functions for struct config_item_type target_core_hba_cit */
2921
2922 static struct config_group *target_core_make_subdev(
2923         struct config_group *group,
2924         const char *name)
2925 {
2926         struct t10_alua_tg_pt_gp *tg_pt_gp;
2927         struct config_item *hba_ci = &group->cg_item;
2928         struct se_hba *hba = item_to_hba(hba_ci);
2929         struct target_backend *tb = hba->backend;
2930         struct se_device *dev;
2931         int errno = -ENOMEM, ret;
2932
2933         ret = mutex_lock_interruptible(&hba->hba_access_mutex);
2934         if (ret)
2935                 return ERR_PTR(ret);
2936
2937         dev = target_alloc_device(hba, name);
2938         if (!dev)
2939                 goto out_unlock;
2940
2941         config_group_init_type_name(&dev->dev_group, name, &tb->tb_dev_cit);
2942
2943         config_group_init_type_name(&dev->dev_attrib.da_group, "attrib",
2944                         &tb->tb_dev_attrib_cit);
2945         configfs_add_default_group(&dev->dev_attrib.da_group, &dev->dev_group);
2946
2947         config_group_init_type_name(&dev->dev_pr_group, "pr",
2948                         &tb->tb_dev_pr_cit);
2949         configfs_add_default_group(&dev->dev_pr_group, &dev->dev_group);
2950
2951         config_group_init_type_name(&dev->t10_wwn.t10_wwn_group, "wwn",
2952                         &tb->tb_dev_wwn_cit);
2953         configfs_add_default_group(&dev->t10_wwn.t10_wwn_group,
2954                         &dev->dev_group);
2955
2956         config_group_init_type_name(&dev->t10_alua.alua_tg_pt_gps_group,
2957                         "alua", &tb->tb_dev_alua_tg_pt_gps_cit);
2958         configfs_add_default_group(&dev->t10_alua.alua_tg_pt_gps_group,
2959                         &dev->dev_group);
2960
2961         config_group_init_type_name(&dev->dev_stat_grps.stat_group,
2962                         "statistics", &tb->tb_dev_stat_cit);
2963         configfs_add_default_group(&dev->dev_stat_grps.stat_group,
2964                         &dev->dev_group);
2965
2966         /*
2967          * Add core/$HBA/$DEV/alua/default_tg_pt_gp
2968          */
2969         tg_pt_gp = core_alua_allocate_tg_pt_gp(dev, "default_tg_pt_gp", 1);
2970         if (!tg_pt_gp)
2971                 goto out_free_device;
2972         dev->t10_alua.default_tg_pt_gp = tg_pt_gp;
2973
2974         config_group_init_type_name(&tg_pt_gp->tg_pt_gp_group,
2975                         "default_tg_pt_gp", &target_core_alua_tg_pt_gp_cit);
2976         configfs_add_default_group(&tg_pt_gp->tg_pt_gp_group,
2977                         &dev->t10_alua.alua_tg_pt_gps_group);
2978
2979         /*
2980          * Add core/$HBA/$DEV/statistics/ default groups
2981          */
2982         target_stat_setup_dev_default_groups(dev);
2983
2984         mutex_unlock(&hba->hba_access_mutex);
2985         return &dev->dev_group;
2986
2987 out_free_device:
2988         target_free_device(dev);
2989 out_unlock:
2990         mutex_unlock(&hba->hba_access_mutex);
2991         return ERR_PTR(errno);
2992 }
2993
2994 static void target_core_drop_subdev(
2995         struct config_group *group,
2996         struct config_item *item)
2997 {
2998         struct config_group *dev_cg = to_config_group(item);
2999         struct se_device *dev =
3000                 container_of(dev_cg, struct se_device, dev_group);
3001         struct se_hba *hba;
3002
3003         hba = item_to_hba(&dev->se_hba->hba_group.cg_item);
3004
3005         mutex_lock(&hba->hba_access_mutex);
3006
3007         configfs_remove_default_groups(&dev->dev_stat_grps.stat_group);
3008         configfs_remove_default_groups(&dev->t10_alua.alua_tg_pt_gps_group);
3009
3010         /*
3011          * core_alua_free_tg_pt_gp() is called from ->default_tg_pt_gp
3012          * directly from target_core_alua_tg_pt_gp_release().
3013          */
3014         dev->t10_alua.default_tg_pt_gp = NULL;
3015
3016         configfs_remove_default_groups(dev_cg);
3017
3018         /*
3019          * se_dev is released from target_core_dev_item_ops->release()
3020          */
3021         config_item_put(item);
3022         mutex_unlock(&hba->hba_access_mutex);
3023 }
3024
3025 static struct configfs_group_operations target_core_hba_group_ops = {
3026         .make_group             = target_core_make_subdev,
3027         .drop_item              = target_core_drop_subdev,
3028 };
3029
3030
3031 static inline struct se_hba *to_hba(struct config_item *item)
3032 {
3033         return container_of(to_config_group(item), struct se_hba, hba_group);
3034 }
3035
3036 static ssize_t target_hba_info_show(struct config_item *item, char *page)
3037 {
3038         struct se_hba *hba = to_hba(item);
3039
3040         return sprintf(page, "HBA Index: %d plugin: %s version: %s\n",
3041                         hba->hba_id, hba->backend->ops->name,
3042                         TARGET_CORE_VERSION);
3043 }
3044
3045 static ssize_t target_hba_mode_show(struct config_item *item, char *page)
3046 {
3047         struct se_hba *hba = to_hba(item);
3048         int hba_mode = 0;
3049
3050         if (hba->hba_flags & HBA_FLAGS_PSCSI_MODE)
3051                 hba_mode = 1;
3052
3053         return sprintf(page, "%d\n", hba_mode);
3054 }
3055
3056 static ssize_t target_hba_mode_store(struct config_item *item,
3057                 const char *page, size_t count)
3058 {
3059         struct se_hba *hba = to_hba(item);
3060         unsigned long mode_flag;
3061         int ret;
3062
3063         if (hba->backend->ops->pmode_enable_hba == NULL)
3064                 return -EINVAL;
3065
3066         ret = kstrtoul(page, 0, &mode_flag);
3067         if (ret < 0) {
3068                 pr_err("Unable to extract hba mode flag: %d\n", ret);
3069                 return ret;
3070         }
3071
3072         if (hba->dev_count) {
3073                 pr_err("Unable to set hba_mode with active devices\n");
3074                 return -EINVAL;
3075         }
3076
3077         ret = hba->backend->ops->pmode_enable_hba(hba, mode_flag);
3078         if (ret < 0)
3079                 return -EINVAL;
3080         if (ret > 0)
3081                 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
3082         else if (ret == 0)
3083                 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
3084
3085         return count;
3086 }
3087
3088 CONFIGFS_ATTR_RO(target_, hba_info);
3089 CONFIGFS_ATTR(target_, hba_mode);
3090
3091 static void target_core_hba_release(struct config_item *item)
3092 {
3093         struct se_hba *hba = container_of(to_config_group(item),
3094                                 struct se_hba, hba_group);
3095         core_delete_hba(hba);
3096 }
3097
3098 static struct configfs_attribute *target_core_hba_attrs[] = {
3099         &target_attr_hba_info,
3100         &target_attr_hba_mode,
3101         NULL,
3102 };
3103
3104 static struct configfs_item_operations target_core_hba_item_ops = {
3105         .release                = target_core_hba_release,
3106 };
3107
3108 static const struct config_item_type target_core_hba_cit = {
3109         .ct_item_ops            = &target_core_hba_item_ops,
3110         .ct_group_ops           = &target_core_hba_group_ops,
3111         .ct_attrs               = target_core_hba_attrs,
3112         .ct_owner               = THIS_MODULE,
3113 };
3114
3115 static struct config_group *target_core_call_addhbatotarget(
3116         struct config_group *group,
3117         const char *name)
3118 {
3119         char *se_plugin_str, *str, *str2;
3120         struct se_hba *hba;
3121         char buf[TARGET_CORE_NAME_MAX_LEN];
3122         unsigned long plugin_dep_id = 0;
3123         int ret;
3124
3125         memset(buf, 0, TARGET_CORE_NAME_MAX_LEN);
3126         if (strlen(name) >= TARGET_CORE_NAME_MAX_LEN) {
3127                 pr_err("Passed *name strlen(): %d exceeds"
3128                         " TARGET_CORE_NAME_MAX_LEN: %d\n", (int)strlen(name),
3129                         TARGET_CORE_NAME_MAX_LEN);
3130                 return ERR_PTR(-ENAMETOOLONG);
3131         }
3132         snprintf(buf, TARGET_CORE_NAME_MAX_LEN, "%s", name);
3133
3134         str = strstr(buf, "_");
3135         if (!str) {
3136                 pr_err("Unable to locate \"_\" for $SUBSYSTEM_PLUGIN_$HOST_ID\n");
3137                 return ERR_PTR(-EINVAL);
3138         }
3139         se_plugin_str = buf;
3140         /*
3141          * Special case for subsystem plugins that have "_" in their names.
3142          * Namely rd_direct and rd_mcp..
3143          */
3144         str2 = strstr(str+1, "_");
3145         if (str2) {
3146                 *str2 = '\0'; /* Terminate for *se_plugin_str */
3147                 str2++; /* Skip to start of plugin dependent ID */
3148                 str = str2;
3149         } else {
3150                 *str = '\0'; /* Terminate for *se_plugin_str */
3151                 str++; /* Skip to start of plugin dependent ID */
3152         }
3153
3154         ret = kstrtoul(str, 0, &plugin_dep_id);
3155         if (ret < 0) {
3156                 pr_err("kstrtoul() returned %d for"
3157                                 " plugin_dep_id\n", ret);
3158                 return ERR_PTR(ret);
3159         }
3160         /*
3161          * Load up TCM subsystem plugins if they have not already been loaded.
3162          */
3163         transport_subsystem_check_init();
3164
3165         hba = core_alloc_hba(se_plugin_str, plugin_dep_id, 0);
3166         if (IS_ERR(hba))
3167                 return ERR_CAST(hba);
3168
3169         config_group_init_type_name(&hba->hba_group, name,
3170                         &target_core_hba_cit);
3171
3172         return &hba->hba_group;
3173 }
3174
3175 static void target_core_call_delhbafromtarget(
3176         struct config_group *group,
3177         struct config_item *item)
3178 {
3179         /*
3180          * core_delete_hba() is called from target_core_hba_item_ops->release()
3181          * -> target_core_hba_release()
3182          */
3183         config_item_put(item);
3184 }
3185
3186 static struct configfs_group_operations target_core_group_ops = {
3187         .make_group     = target_core_call_addhbatotarget,
3188         .drop_item      = target_core_call_delhbafromtarget,
3189 };
3190
3191 static const struct config_item_type target_core_cit = {
3192         .ct_item_ops    = NULL,
3193         .ct_group_ops   = &target_core_group_ops,
3194         .ct_attrs       = NULL,
3195         .ct_owner       = THIS_MODULE,
3196 };
3197
3198 /* Stop functions for struct config_item_type target_core_hba_cit */
3199
3200 void target_setup_backend_cits(struct target_backend *tb)
3201 {
3202         target_core_setup_dev_cit(tb);
3203         target_core_setup_dev_attrib_cit(tb);
3204         target_core_setup_dev_pr_cit(tb);
3205         target_core_setup_dev_wwn_cit(tb);
3206         target_core_setup_dev_alua_tg_pt_gps_cit(tb);
3207   &n