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1 | /******************************************************************************* |
2 | * Filename: target_core_tpg.c | |
3 | * | |
4 | * This file contains generic Target Portal Group related functions. | |
5 | * | |
6 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. | |
7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
8 | * Copyright (c) 2007-2010 Rising Tide Systems | |
9 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
10 | * | |
11 | * Nicholas A. Bellinger <nab@kernel.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | * | |
27 | ******************************************************************************/ | |
28 | ||
29 | #include <linux/net.h> | |
30 | #include <linux/string.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/smp_lock.h> | |
35 | #include <linux/in.h> | |
36 | #include <net/sock.h> | |
37 | #include <net/tcp.h> | |
38 | #include <scsi/scsi.h> | |
39 | #include <scsi/scsi_cmnd.h> | |
40 | ||
41 | #include <target/target_core_base.h> | |
42 | #include <target/target_core_device.h> | |
43 | #include <target/target_core_tpg.h> | |
44 | #include <target/target_core_transport.h> | |
45 | #include <target/target_core_fabric_ops.h> | |
46 | ||
47 | #include "target_core_hba.h" | |
48 | ||
49 | /* core_clear_initiator_node_from_tpg(): | |
50 | * | |
51 | * | |
52 | */ | |
53 | static void core_clear_initiator_node_from_tpg( | |
54 | struct se_node_acl *nacl, | |
55 | struct se_portal_group *tpg) | |
56 | { | |
57 | int i; | |
58 | struct se_dev_entry *deve; | |
59 | struct se_lun *lun; | |
60 | struct se_lun_acl *acl, *acl_tmp; | |
61 | ||
62 | spin_lock_irq(&nacl->device_list_lock); | |
63 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { | |
64 | deve = &nacl->device_list[i]; | |
65 | ||
66 | if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS)) | |
67 | continue; | |
68 | ||
69 | if (!deve->se_lun) { | |
70 | printk(KERN_ERR "%s device entries device pointer is" | |
71 | " NULL, but Initiator has access.\n", | |
72 | TPG_TFO(tpg)->get_fabric_name()); | |
73 | continue; | |
74 | } | |
75 | ||
76 | lun = deve->se_lun; | |
77 | spin_unlock_irq(&nacl->device_list_lock); | |
78 | core_update_device_list_for_node(lun, NULL, deve->mapped_lun, | |
79 | TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg, 0); | |
80 | ||
81 | spin_lock(&lun->lun_acl_lock); | |
82 | list_for_each_entry_safe(acl, acl_tmp, | |
83 | &lun->lun_acl_list, lacl_list) { | |
84 | if (!(strcmp(acl->initiatorname, | |
85 | nacl->initiatorname)) && | |
86 | (acl->mapped_lun == deve->mapped_lun)) | |
87 | break; | |
88 | } | |
89 | ||
90 | if (!acl) { | |
91 | printk(KERN_ERR "Unable to locate struct se_lun_acl for %s," | |
92 | " mapped_lun: %u\n", nacl->initiatorname, | |
93 | deve->mapped_lun); | |
94 | spin_unlock(&lun->lun_acl_lock); | |
95 | spin_lock_irq(&nacl->device_list_lock); | |
96 | continue; | |
97 | } | |
98 | ||
99 | list_del(&acl->lacl_list); | |
100 | spin_unlock(&lun->lun_acl_lock); | |
101 | ||
102 | spin_lock_irq(&nacl->device_list_lock); | |
103 | kfree(acl); | |
104 | } | |
105 | spin_unlock_irq(&nacl->device_list_lock); | |
106 | } | |
107 | ||
108 | /* __core_tpg_get_initiator_node_acl(): | |
109 | * | |
110 | * spin_lock_bh(&tpg->acl_node_lock); must be held when calling | |
111 | */ | |
112 | struct se_node_acl *__core_tpg_get_initiator_node_acl( | |
113 | struct se_portal_group *tpg, | |
114 | const char *initiatorname) | |
115 | { | |
116 | struct se_node_acl *acl; | |
117 | ||
118 | list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { | |
119 | if (!(strcmp(acl->initiatorname, initiatorname))) | |
120 | return acl; | |
121 | } | |
122 | ||
123 | return NULL; | |
124 | } | |
125 | ||
126 | /* core_tpg_get_initiator_node_acl(): | |
127 | * | |
128 | * | |
129 | */ | |
130 | struct se_node_acl *core_tpg_get_initiator_node_acl( | |
131 | struct se_portal_group *tpg, | |
132 | unsigned char *initiatorname) | |
133 | { | |
134 | struct se_node_acl *acl; | |
135 | ||
136 | spin_lock_bh(&tpg->acl_node_lock); | |
137 | list_for_each_entry(acl, &tpg->acl_node_list, acl_list) { | |
138 | if (!(strcmp(acl->initiatorname, initiatorname)) && | |
139 | (!(acl->dynamic_node_acl))) { | |
140 | spin_unlock_bh(&tpg->acl_node_lock); | |
141 | return acl; | |
142 | } | |
143 | } | |
144 | spin_unlock_bh(&tpg->acl_node_lock); | |
145 | ||
146 | return NULL; | |
147 | } | |
148 | ||
149 | /* core_tpg_add_node_to_devs(): | |
150 | * | |
151 | * | |
152 | */ | |
153 | void core_tpg_add_node_to_devs( | |
154 | struct se_node_acl *acl, | |
155 | struct se_portal_group *tpg) | |
156 | { | |
157 | int i = 0; | |
158 | u32 lun_access = 0; | |
159 | struct se_lun *lun; | |
160 | struct se_device *dev; | |
161 | ||
162 | spin_lock(&tpg->tpg_lun_lock); | |
163 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { | |
164 | lun = &tpg->tpg_lun_list[i]; | |
165 | if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) | |
166 | continue; | |
167 | ||
168 | spin_unlock(&tpg->tpg_lun_lock); | |
169 | ||
170 | dev = lun->lun_se_dev; | |
171 | /* | |
172 | * By default in LIO-Target $FABRIC_MOD, | |
173 | * demo_mode_write_protect is ON, or READ_ONLY; | |
174 | */ | |
175 | if (!(TPG_TFO(tpg)->tpg_check_demo_mode_write_protect(tpg))) { | |
176 | if (dev->dev_flags & DF_READ_ONLY) | |
177 | lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; | |
178 | else | |
179 | lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; | |
180 | } else { | |
181 | /* | |
182 | * Allow only optical drives to issue R/W in default RO | |
183 | * demo mode. | |
184 | */ | |
185 | if (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK) | |
186 | lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; | |
187 | else | |
188 | lun_access = TRANSPORT_LUNFLAGS_READ_WRITE; | |
189 | } | |
190 | ||
191 | printk(KERN_INFO "TARGET_CORE[%s]->TPG[%u]_LUN[%u] - Adding %s" | |
192 | " access for LUN in Demo Mode\n", | |
193 | TPG_TFO(tpg)->get_fabric_name(), | |
194 | TPG_TFO(tpg)->tpg_get_tag(tpg), lun->unpacked_lun, | |
195 | (lun_access == TRANSPORT_LUNFLAGS_READ_WRITE) ? | |
196 | "READ-WRITE" : "READ-ONLY"); | |
197 | ||
198 | core_update_device_list_for_node(lun, NULL, lun->unpacked_lun, | |
199 | lun_access, acl, tpg, 1); | |
200 | spin_lock(&tpg->tpg_lun_lock); | |
201 | } | |
202 | spin_unlock(&tpg->tpg_lun_lock); | |
203 | } | |
204 | ||
205 | /* core_set_queue_depth_for_node(): | |
206 | * | |
207 | * | |
208 | */ | |
209 | static int core_set_queue_depth_for_node( | |
210 | struct se_portal_group *tpg, | |
211 | struct se_node_acl *acl) | |
212 | { | |
213 | if (!acl->queue_depth) { | |
214 | printk(KERN_ERR "Queue depth for %s Initiator Node: %s is 0," | |
215 | "defaulting to 1.\n", TPG_TFO(tpg)->get_fabric_name(), | |
216 | acl->initiatorname); | |
217 | acl->queue_depth = 1; | |
218 | } | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | /* core_create_device_list_for_node(): | |
224 | * | |
225 | * | |
226 | */ | |
227 | static int core_create_device_list_for_node(struct se_node_acl *nacl) | |
228 | { | |
229 | struct se_dev_entry *deve; | |
230 | int i; | |
231 | ||
232 | nacl->device_list = kzalloc(sizeof(struct se_dev_entry) * | |
233 | TRANSPORT_MAX_LUNS_PER_TPG, GFP_KERNEL); | |
234 | if (!(nacl->device_list)) { | |
235 | printk(KERN_ERR "Unable to allocate memory for" | |
236 | " struct se_node_acl->device_list\n"); | |
237 | return -1; | |
238 | } | |
239 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { | |
240 | deve = &nacl->device_list[i]; | |
241 | ||
242 | atomic_set(&deve->ua_count, 0); | |
243 | atomic_set(&deve->pr_ref_count, 0); | |
244 | spin_lock_init(&deve->ua_lock); | |
245 | INIT_LIST_HEAD(&deve->alua_port_list); | |
246 | INIT_LIST_HEAD(&deve->ua_list); | |
247 | } | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | /* core_tpg_check_initiator_node_acl() | |
253 | * | |
254 | * | |
255 | */ | |
256 | struct se_node_acl *core_tpg_check_initiator_node_acl( | |
257 | struct se_portal_group *tpg, | |
258 | unsigned char *initiatorname) | |
259 | { | |
260 | struct se_node_acl *acl; | |
261 | ||
262 | acl = core_tpg_get_initiator_node_acl(tpg, initiatorname); | |
263 | if ((acl)) | |
264 | return acl; | |
265 | ||
266 | if (!(TPG_TFO(tpg)->tpg_check_demo_mode(tpg))) | |
267 | return NULL; | |
268 | ||
269 | acl = TPG_TFO(tpg)->tpg_alloc_fabric_acl(tpg); | |
270 | if (!(acl)) | |
271 | return NULL; | |
272 | ||
273 | INIT_LIST_HEAD(&acl->acl_list); | |
274 | INIT_LIST_HEAD(&acl->acl_sess_list); | |
275 | spin_lock_init(&acl->device_list_lock); | |
276 | spin_lock_init(&acl->nacl_sess_lock); | |
277 | atomic_set(&acl->acl_pr_ref_count, 0); | |
278 | atomic_set(&acl->mib_ref_count, 0); | |
279 | acl->queue_depth = TPG_TFO(tpg)->tpg_get_default_depth(tpg); | |
280 | snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); | |
281 | acl->se_tpg = tpg; | |
282 | acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); | |
283 | spin_lock_init(&acl->stats_lock); | |
284 | acl->dynamic_node_acl = 1; | |
285 | ||
286 | TPG_TFO(tpg)->set_default_node_attributes(acl); | |
287 | ||
288 | if (core_create_device_list_for_node(acl) < 0) { | |
289 | TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl); | |
290 | return NULL; | |
291 | } | |
292 | ||
293 | if (core_set_queue_depth_for_node(tpg, acl) < 0) { | |
294 | core_free_device_list_for_node(acl, tpg); | |
295 | TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl); | |
296 | return NULL; | |
297 | } | |
298 | ||
299 | core_tpg_add_node_to_devs(acl, tpg); | |
300 | ||
301 | spin_lock_bh(&tpg->acl_node_lock); | |
302 | list_add_tail(&acl->acl_list, &tpg->acl_node_list); | |
303 | tpg->num_node_acls++; | |
304 | spin_unlock_bh(&tpg->acl_node_lock); | |
305 | ||
306 | printk("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s" | |
307 | " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(), | |
308 | TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth, | |
309 | TPG_TFO(tpg)->get_fabric_name(), initiatorname); | |
310 | ||
311 | return acl; | |
312 | } | |
313 | EXPORT_SYMBOL(core_tpg_check_initiator_node_acl); | |
314 | ||
315 | void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl) | |
316 | { | |
317 | while (atomic_read(&nacl->acl_pr_ref_count) != 0) | |
318 | cpu_relax(); | |
319 | } | |
320 | ||
321 | void core_tpg_wait_for_mib_ref(struct se_node_acl *nacl) | |
322 | { | |
323 | while (atomic_read(&nacl->mib_ref_count) != 0) | |
324 | cpu_relax(); | |
325 | } | |
326 | ||
327 | void core_tpg_clear_object_luns(struct se_portal_group *tpg) | |
328 | { | |
329 | int i, ret; | |
330 | struct se_lun *lun; | |
331 | ||
332 | spin_lock(&tpg->tpg_lun_lock); | |
333 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { | |
334 | lun = &tpg->tpg_lun_list[i]; | |
335 | ||
336 | if ((lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) || | |
337 | (lun->lun_se_dev == NULL)) | |
338 | continue; | |
339 | ||
340 | spin_unlock(&tpg->tpg_lun_lock); | |
341 | ret = core_dev_del_lun(tpg, lun->unpacked_lun); | |
342 | spin_lock(&tpg->tpg_lun_lock); | |
343 | } | |
344 | spin_unlock(&tpg->tpg_lun_lock); | |
345 | } | |
346 | EXPORT_SYMBOL(core_tpg_clear_object_luns); | |
347 | ||
348 | /* core_tpg_add_initiator_node_acl(): | |
349 | * | |
350 | * | |
351 | */ | |
352 | struct se_node_acl *core_tpg_add_initiator_node_acl( | |
353 | struct se_portal_group *tpg, | |
354 | struct se_node_acl *se_nacl, | |
355 | const char *initiatorname, | |
356 | u32 queue_depth) | |
357 | { | |
358 | struct se_node_acl *acl = NULL; | |
359 | ||
360 | spin_lock_bh(&tpg->acl_node_lock); | |
361 | acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); | |
362 | if ((acl)) { | |
363 | if (acl->dynamic_node_acl) { | |
364 | acl->dynamic_node_acl = 0; | |
365 | printk(KERN_INFO "%s_TPG[%u] - Replacing dynamic ACL" | |
366 | " for %s\n", TPG_TFO(tpg)->get_fabric_name(), | |
367 | TPG_TFO(tpg)->tpg_get_tag(tpg), initiatorname); | |
368 | spin_unlock_bh(&tpg->acl_node_lock); | |
369 | /* | |
370 | * Release the locally allocated struct se_node_acl | |
371 | * because * core_tpg_add_initiator_node_acl() returned | |
372 | * a pointer to an existing demo mode node ACL. | |
373 | */ | |
374 | if (se_nacl) | |
375 | TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, | |
376 | se_nacl); | |
377 | goto done; | |
378 | } | |
379 | ||
380 | printk(KERN_ERR "ACL entry for %s Initiator" | |
381 | " Node %s already exists for TPG %u, ignoring" | |
382 | " request.\n", TPG_TFO(tpg)->get_fabric_name(), | |
383 | initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg)); | |
384 | spin_unlock_bh(&tpg->acl_node_lock); | |
385 | return ERR_PTR(-EEXIST); | |
386 | } | |
387 | spin_unlock_bh(&tpg->acl_node_lock); | |
388 | ||
389 | if (!(se_nacl)) { | |
390 | printk("struct se_node_acl pointer is NULL\n"); | |
391 | return ERR_PTR(-EINVAL); | |
392 | } | |
393 | /* | |
394 | * For v4.x logic the se_node_acl_s is hanging off a fabric | |
395 | * dependent structure allocated via | |
396 | * struct target_core_fabric_ops->fabric_make_nodeacl() | |
397 | */ | |
398 | acl = se_nacl; | |
399 | ||
400 | INIT_LIST_HEAD(&acl->acl_list); | |
401 | INIT_LIST_HEAD(&acl->acl_sess_list); | |
402 | spin_lock_init(&acl->device_list_lock); | |
403 | spin_lock_init(&acl->nacl_sess_lock); | |
404 | atomic_set(&acl->acl_pr_ref_count, 0); | |
405 | acl->queue_depth = queue_depth; | |
406 | snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname); | |
407 | acl->se_tpg = tpg; | |
408 | acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX); | |
409 | spin_lock_init(&acl->stats_lock); | |
410 | ||
411 | TPG_TFO(tpg)->set_default_node_attributes(acl); | |
412 | ||
413 | if (core_create_device_list_for_node(acl) < 0) { | |
414 | TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl); | |
415 | return ERR_PTR(-ENOMEM); | |
416 | } | |
417 | ||
418 | if (core_set_queue_depth_for_node(tpg, acl) < 0) { | |
419 | core_free_device_list_for_node(acl, tpg); | |
420 | TPG_TFO(tpg)->tpg_release_fabric_acl(tpg, acl); | |
421 | return ERR_PTR(-EINVAL); | |
422 | } | |
423 | ||
424 | spin_lock_bh(&tpg->acl_node_lock); | |
425 | list_add_tail(&acl->acl_list, &tpg->acl_node_list); | |
426 | tpg->num_node_acls++; | |
427 | spin_unlock_bh(&tpg->acl_node_lock); | |
428 | ||
429 | done: | |
430 | printk(KERN_INFO "%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s" | |
431 | " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(), | |
432 | TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth, | |
433 | TPG_TFO(tpg)->get_fabric_name(), initiatorname); | |
434 | ||
435 | return acl; | |
436 | } | |
437 | EXPORT_SYMBOL(core_tpg_add_initiator_node_acl); | |
438 | ||
439 | /* core_tpg_del_initiator_node_acl(): | |
440 | * | |
441 | * | |
442 | */ | |
443 | int core_tpg_del_initiator_node_acl( | |
444 | struct se_portal_group *tpg, | |
445 | struct se_node_acl *acl, | |
446 | int force) | |
447 | { | |
448 | struct se_session *sess, *sess_tmp; | |
449 | int dynamic_acl = 0; | |
450 | ||
451 | spin_lock_bh(&tpg->acl_node_lock); | |
452 | if (acl->dynamic_node_acl) { | |
453 | acl->dynamic_node_acl = 0; | |
454 | dynamic_acl = 1; | |
455 | } | |
456 | list_del(&acl->acl_list); | |
457 | tpg->num_node_acls--; | |
458 | spin_unlock_bh(&tpg->acl_node_lock); | |
459 | ||
460 | spin_lock_bh(&tpg->session_lock); | |
461 | list_for_each_entry_safe(sess, sess_tmp, | |
462 | &tpg->tpg_sess_list, sess_list) { | |
463 | if (sess->se_node_acl != acl) | |
464 | continue; | |
465 | /* | |
466 | * Determine if the session needs to be closed by our context. | |
467 | */ | |
468 | if (!(TPG_TFO(tpg)->shutdown_session(sess))) | |
469 | continue; | |
470 | ||
471 | spin_unlock_bh(&tpg->session_lock); | |
472 | /* | |
473 | * If the $FABRIC_MOD session for the Initiator Node ACL exists, | |
474 | * forcefully shutdown the $FABRIC_MOD session/nexus. | |
475 | */ | |
476 | TPG_TFO(tpg)->close_session(sess); | |
477 | ||
478 | spin_lock_bh(&tpg->session_lock); | |
479 | } | |
480 | spin_unlock_bh(&tpg->session_lock); | |
481 | ||
482 | core_tpg_wait_for_nacl_pr_ref(acl); | |
483 | core_tpg_wait_for_mib_ref(acl); | |
484 | core_clear_initiator_node_from_tpg(acl, tpg); | |
485 | core_free_device_list_for_node(acl, tpg); | |
486 | ||
487 | printk(KERN_INFO "%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s" | |
488 | " Initiator Node: %s\n", TPG_TFO(tpg)->get_fabric_name(), | |
489 | TPG_TFO(tpg)->tpg_get_tag(tpg), acl->queue_depth, | |
490 | TPG_TFO(tpg)->get_fabric_name(), acl->initiatorname); | |
491 | ||
492 | return 0; | |
493 | } | |
494 | EXPORT_SYMBOL(core_tpg_del_initiator_node_acl); | |
495 | ||
496 | /* core_tpg_set_initiator_node_queue_depth(): | |
497 | * | |
498 | * | |
499 | */ | |
500 | int core_tpg_set_initiator_node_queue_depth( | |
501 | struct se_portal_group *tpg, | |
502 | unsigned char *initiatorname, | |
503 | u32 queue_depth, | |
504 | int force) | |
505 | { | |
506 | struct se_session *sess, *init_sess = NULL; | |
507 | struct se_node_acl *acl; | |
508 | int dynamic_acl = 0; | |
509 | ||
510 | spin_lock_bh(&tpg->acl_node_lock); | |
511 | acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname); | |
512 | if (!(acl)) { | |
513 | printk(KERN_ERR "Access Control List entry for %s Initiator" | |
514 | " Node %s does not exists for TPG %hu, ignoring" | |
515 | " request.\n", TPG_TFO(tpg)->get_fabric_name(), | |
516 | initiatorname, TPG_TFO(tpg)->tpg_get_tag(tpg)); | |
517 | spin_unlock_bh(&tpg->acl_node_lock); | |
518 | return -ENODEV; | |
519 | } | |
520 | if (acl->dynamic_node_acl) { | |
521 | acl->dynamic_node_acl = 0; | |
522 | dynamic_acl = 1; | |
523 | } | |
524 | spin_unlock_bh(&tpg->acl_node_lock); | |
525 | ||
526 | spin_lock_bh(&tpg->session_lock); | |
527 | list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) { | |
528 | if (sess->se_node_acl != acl) | |
529 | continue; | |
530 | ||
531 | if (!force) { | |
532 | printk(KERN_ERR "Unable to change queue depth for %s" | |
533 | " Initiator Node: %s while session is" | |
534 | " operational. To forcefully change the queue" | |
535 | " depth and force session reinstatement" | |
536 | " use the \"force=1\" parameter.\n", | |
537 | TPG_TFO(tpg)->get_fabric_name(), initiatorname); | |
538 | spin_unlock_bh(&tpg->session_lock); | |
539 | ||
540 | spin_lock_bh(&tpg->acl_node_lock); | |
541 | if (dynamic_acl) | |
542 | acl->dynamic_node_acl = 1; | |
543 | spin_unlock_bh(&tpg->acl_node_lock); | |
544 | return -EEXIST; | |
545 | } | |
546 | /* | |
547 | * Determine if the session needs to be closed by our context. | |
548 | */ | |
549 | if (!(TPG_TFO(tpg)->shutdown_session(sess))) | |
550 | continue; | |
551 | ||
552 | init_sess = sess; | |
553 | break; | |
554 | } | |
555 | ||
556 | /* | |
557 | * User has requested to change the queue depth for a Initiator Node. | |
558 | * Change the value in the Node's struct se_node_acl, and call | |
559 | * core_set_queue_depth_for_node() to add the requested queue depth. | |
560 | * | |
561 | * Finally call TPG_TFO(tpg)->close_session() to force session | |
562 | * reinstatement to occur if there is an active session for the | |
563 | * $FABRIC_MOD Initiator Node in question. | |
564 | */ | |
565 | acl->queue_depth = queue_depth; | |
566 | ||
567 | if (core_set_queue_depth_for_node(tpg, acl) < 0) { | |
568 | spin_unlock_bh(&tpg->session_lock); | |
569 | /* | |
570 | * Force session reinstatement if | |
571 | * core_set_queue_depth_for_node() failed, because we assume | |
572 | * the $FABRIC_MOD has already the set session reinstatement | |
573 | * bit from TPG_TFO(tpg)->shutdown_session() called above. | |
574 | */ | |
575 | if (init_sess) | |
576 | TPG_TFO(tpg)->close_session(init_sess); | |
577 | ||
578 | spin_lock_bh(&tpg->acl_node_lock); | |
579 | if (dynamic_acl) | |
580 | acl->dynamic_node_acl = 1; | |
581 | spin_unlock_bh(&tpg->acl_node_lock); | |
582 | return -EINVAL; | |
583 | } | |
584 | spin_unlock_bh(&tpg->session_lock); | |
585 | /* | |
586 | * If the $FABRIC_MOD session for the Initiator Node ACL exists, | |
587 | * forcefully shutdown the $FABRIC_MOD session/nexus. | |
588 | */ | |
589 | if (init_sess) | |
590 | TPG_TFO(tpg)->close_session(init_sess); | |
591 | ||
592 | printk(KERN_INFO "Successfuly changed queue depth to: %d for Initiator" | |
593 | " Node: %s on %s Target Portal Group: %u\n", queue_depth, | |
594 | initiatorname, TPG_TFO(tpg)->get_fabric_name(), | |
595 | TPG_TFO(tpg)->tpg_get_tag(tpg)); | |
596 | ||
597 | spin_lock_bh(&tpg->acl_node_lock); | |
598 | if (dynamic_acl) | |
599 | acl->dynamic_node_acl = 1; | |
600 | spin_unlock_bh(&tpg->acl_node_lock); | |
601 | ||
602 | return 0; | |
603 | } | |
604 | EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth); | |
605 | ||
606 | static int core_tpg_setup_virtual_lun0(struct se_portal_group *se_tpg) | |
607 | { | |
608 | /* Set in core_dev_setup_virtual_lun0() */ | |
609 | struct se_device *dev = se_global->g_lun0_dev; | |
610 | struct se_lun *lun = &se_tpg->tpg_virt_lun0; | |
611 | u32 lun_access = TRANSPORT_LUNFLAGS_READ_ONLY; | |
612 | int ret; | |
613 | ||
614 | lun->unpacked_lun = 0; | |
615 | lun->lun_status = TRANSPORT_LUN_STATUS_FREE; | |
616 | atomic_set(&lun->lun_acl_count, 0); | |
617 | init_completion(&lun->lun_shutdown_comp); | |
618 | INIT_LIST_HEAD(&lun->lun_acl_list); | |
619 | INIT_LIST_HEAD(&lun->lun_cmd_list); | |
620 | spin_lock_init(&lun->lun_acl_lock); | |
621 | spin_lock_init(&lun->lun_cmd_lock); | |
622 | spin_lock_init(&lun->lun_sep_lock); | |
623 | ||
624 | ret = core_tpg_post_addlun(se_tpg, lun, lun_access, dev); | |
625 | if (ret < 0) | |
626 | return -1; | |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
631 | static void core_tpg_release_virtual_lun0(struct se_portal_group *se_tpg) | |
632 | { | |
633 | struct se_lun *lun = &se_tpg->tpg_virt_lun0; | |
634 | ||
635 | core_tpg_post_dellun(se_tpg, lun); | |
636 | } | |
637 | ||
638 | int core_tpg_register( | |
639 | struct target_core_fabric_ops *tfo, | |
640 | struct se_wwn *se_wwn, | |
641 | struct se_portal_group *se_tpg, | |
642 | void *tpg_fabric_ptr, | |
643 | int se_tpg_type) | |
644 | { | |
645 | struct se_lun *lun; | |
646 | u32 i; | |
647 | ||
648 | se_tpg->tpg_lun_list = kzalloc((sizeof(struct se_lun) * | |
649 | TRANSPORT_MAX_LUNS_PER_TPG), GFP_KERNEL); | |
650 | if (!(se_tpg->tpg_lun_list)) { | |
651 | printk(KERN_ERR "Unable to allocate struct se_portal_group->" | |
652 | "tpg_lun_list\n"); | |
653 | return -ENOMEM; | |
654 | } | |
655 | ||
656 | for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) { | |
657 | lun = &se_tpg->tpg_lun_list[i]; | |
658 | lun->unpacked_lun = i; | |
659 | lun->lun_status = TRANSPORT_LUN_STATUS_FREE; | |
660 | atomic_set(&lun->lun_acl_count, 0); | |
661 | init_completion(&lun->lun_shutdown_comp); | |
662 | INIT_LIST_HEAD(&lun->lun_acl_list); | |
663 | INIT_LIST_HEAD(&lun->lun_cmd_list); | |
664 | spin_lock_init(&lun->lun_acl_lock); | |
665 | spin_lock_init(&lun->lun_cmd_lock); | |
666 | spin_lock_init(&lun->lun_sep_lock); | |
667 | } | |
668 | ||
669 | se_tpg->se_tpg_type = se_tpg_type; | |
670 | se_tpg->se_tpg_fabric_ptr = tpg_fabric_ptr; | |
671 | se_tpg->se_tpg_tfo = tfo; | |
672 | se_tpg->se_tpg_wwn = se_wwn; | |
673 | atomic_set(&se_tpg->tpg_pr_ref_count, 0); | |
674 | INIT_LIST_HEAD(&se_tpg->acl_node_list); | |
675 | INIT_LIST_HEAD(&se_tpg->se_tpg_list); | |
676 | INIT_LIST_HEAD(&se_tpg->tpg_sess_list); | |
677 | spin_lock_init(&se_tpg->acl_node_lock); | |
678 | spin_lock_init(&se_tpg->session_lock); | |
679 | spin_lock_init(&se_tpg->tpg_lun_lock); | |
680 | ||
681 | if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) { | |
682 | if (core_tpg_setup_virtual_lun0(se_tpg) < 0) { | |
683 | kfree(se_tpg); | |
684 | return -ENOMEM; | |
685 | } | |
686 | } | |
687 | ||
688 | spin_lock_bh(&se_global->se_tpg_lock); | |
689 | list_add_tail(&se_tpg->se_tpg_list, &se_global->g_se_tpg_list); | |
690 | spin_unlock_bh(&se_global->se_tpg_lock); | |
691 | ||
692 | printk(KERN_INFO "TARGET_CORE[%s]: Allocated %s struct se_portal_group for" | |
693 | " endpoint: %s, Portal Tag: %u\n", tfo->get_fabric_name(), | |
694 | (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ? | |
695 | "Normal" : "Discovery", (tfo->tpg_get_wwn(se_tpg) == NULL) ? | |
696 | "None" : tfo->tpg_get_wwn(se_tpg), tfo->tpg_get_tag(se_tpg)); | |
697 | ||
698 | return 0; | |
699 | } | |
700 | EXPORT_SYMBOL(core_tpg_register); | |
701 | ||
702 | int core_tpg_deregister(struct se_portal_group *se_tpg) | |
703 | { | |
704 | printk(KERN_INFO "TARGET_CORE[%s]: Deallocating %s struct se_portal_group" | |
705 | " for endpoint: %s Portal Tag %u\n", | |
706 | (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) ? | |
707 | "Normal" : "Discovery", TPG_TFO(se_tpg)->get_fabric_name(), | |
708 | TPG_TFO(se_tpg)->tpg_get_wwn(se_tpg), | |
709 | TPG_TFO(se_tpg)->tpg_get_tag(se_tpg)); | |
710 | ||
711 | spin_lock_bh(&se_global->se_tpg_lock); | |
712 | list_del(&se_tpg->se_tpg_list); | |
713 | spin_unlock_bh(&se_global->se_tpg_lock); | |
714 | ||
715 | while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0) | |
716 | cpu_relax(); | |
717 | ||
718 | if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL) | |
719 | core_tpg_release_virtual_lun0(se_tpg); | |
720 | ||
721 | se_tpg->se_tpg_fabric_ptr = NULL; | |
722 | kfree(se_tpg->tpg_lun_list); | |
723 | return 0; | |
724 | } | |
725 | EXPORT_SYMBOL(core_tpg_deregister); | |
726 | ||
727 | struct se_lun *core_tpg_pre_addlun( | |
728 | struct se_portal_group *tpg, | |
729 | u32 unpacked_lun) | |
730 | { | |
731 | struct se_lun *lun; | |
732 | ||
733 | if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { | |
734 | printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG" | |
735 | "-1: %u for Target Portal Group: %u\n", | |
736 | TPG_TFO(tpg)->get_fabric_name(), | |
737 | unpacked_lun, TRANSPORT_MAX_LUNS_PER_TPG-1, | |
738 | TPG_TFO(tpg)->tpg_get_tag(tpg)); | |
739 | return ERR_PTR(-EOVERFLOW); | |
740 | } | |
741 | ||
742 | spin_lock(&tpg->tpg_lun_lock); | |
743 | lun = &tpg->tpg_lun_list[unpacked_lun]; | |
744 | if (lun->lun_status == TRANSPORT_LUN_STATUS_ACTIVE) { | |
745 | printk(KERN_ERR "TPG Logical Unit Number: %u is already active" | |
746 | " on %s Target Portal Group: %u, ignoring request.\n", | |
747 | unpacked_lun, TPG_TFO(tpg)->get_fabric_name(), | |
748 | TPG_TFO(tpg)->tpg_get_tag(tpg)); | |
749 | spin_unlock(&tpg->tpg_lun_lock); | |
750 | return ERR_PTR(-EINVAL); | |
751 | } | |
752 | spin_unlock(&tpg->tpg_lun_lock); | |
753 | ||
754 | return lun; | |
755 | } | |
756 | ||
757 | int core_tpg_post_addlun( | |
758 | struct se_portal_group *tpg, | |
759 | struct se_lun *lun, | |
760 | u32 lun_access, | |
761 | void *lun_ptr) | |
762 | { | |
763 | if (core_dev_export(lun_ptr, tpg, lun) < 0) | |
764 | return -1; | |
765 | ||
766 | spin_lock(&tpg->tpg_lun_lock); | |
767 | lun->lun_access = lun_access; | |
768 | lun->lun_status = TRANSPORT_LUN_STATUS_ACTIVE; | |
769 | spin_unlock(&tpg->tpg_lun_lock); | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
774 | static void core_tpg_shutdown_lun( | |
775 | struct se_portal_group *tpg, | |
776 | struct se_lun *lun) | |
777 | { | |
778 | core_clear_lun_from_tpg(lun, tpg); | |
779 | transport_clear_lun_from_sessions(lun); | |
780 | } | |
781 | ||
782 | struct se_lun *core_tpg_pre_dellun( | |
783 | struct se_portal_group *tpg, | |
784 | u32 unpacked_lun, | |
785 | int *ret) | |
786 | { | |
787 | struct se_lun *lun; | |
788 | ||
789 | if (unpacked_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) { | |
790 | printk(KERN_ERR "%s LUN: %u exceeds TRANSPORT_MAX_LUNS_PER_TPG" | |
791 | "-1: %u for Target Portal Group: %u\n", | |
792 | TPG_TFO(tpg)->get_fabric_name(), unpacked_lun, | |
793 | TRANSPORT_MAX_LUNS_PER_TPG-1, | |
794 | TPG_TFO(tpg)->tpg_get_tag(tpg)); | |
795 | return ERR_PTR(-EOVERFLOW); | |
796 | } | |
797 | ||
798 | spin_lock(&tpg->tpg_lun_lock); | |
799 | lun = &tpg->tpg_lun_list[unpacked_lun]; | |
800 | if (lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE) { | |
801 | printk(KERN_ERR "%s Logical Unit Number: %u is not active on" | |
802 | " Target Portal Group: %u, ignoring request.\n", | |
803 | TPG_TFO(tpg)->get_fabric_name(), unpacked_lun, | |
804 | TPG_TFO(tpg)->tpg_get_tag(tpg)); | |
805 | spin_unlock(&tpg->tpg_lun_lock); | |
806 | return ERR_PTR(-ENODEV); | |
807 | } | |
808 | spin_unlock(&tpg->tpg_lun_lock); | |
809 | ||
810 | return lun; | |
811 | } | |
812 | ||
813 | int core_tpg_post_dellun( | |
814 | struct se_portal_group *tpg, | |
815 | struct se_lun *lun) | |
816 | { | |
817 | core_tpg_shutdown_lun(tpg, lun); | |
818 | ||
819 | core_dev_unexport(lun->lun_se_dev, tpg, lun); | |
820 | ||
821 | spin_lock(&tpg->tpg_lun_lock); | |
822 | lun->lun_status = TRANSPORT_LUN_STATUS_FREE; | |
823 | spin_unlock(&tpg->tpg_lun_lock); | |
824 | ||
825 | return 0; | |
826 | } |