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target: Fix ordered task CHECK_CONDITION early exception handling
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
5538d294 37#include <linux/vmalloc.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
ba929992 41#include <scsi/scsi_proto.h>
9ec1e1ce 42#include <scsi/scsi_common.h>
c66ac9db
NB		 43
44#include <target/target_core_base.h>
c4795fb2
CH		 45#include <target/target_core_backend.h>
46#include <target/target_core_fabric.h>
c66ac9db 47
e26d99ae 48#include "target_core_internal.h"
c66ac9db 49#include "target_core_alua.h"
c66ac9db 50#include "target_core_pr.h"
c66ac9db
NB		 51#include "target_core_ua.h"
52
e5c0d6ad
RD		 53#define CREATE_TRACE_POINTS
54#include <trace/events/target.h>
55
35e0e757 56static struct workqueue_struct *target_completion_wq;
c66ac9db 57static struct kmem_cache *se_sess_cache;
c66ac9db 58struct kmem_cache *se_ua_cache;
c66ac9db
NB		 59struct kmem_cache *t10_pr_reg_cache;
60struct kmem_cache *t10_alua_lu_gp_cache;
61struct kmem_cache *t10_alua_lu_gp_mem_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_cache;
229d4f11
HR		 63struct kmem_cache *t10_alua_lba_map_cache;
64struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 65
c66ac9db 66static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 67static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 68 struct se_device *dev);
d5ddad41 69static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 70static void target_complete_ok_work(struct work_struct *work);
c66ac9db 71
e3d6f909 72int init_se_kmem_caches(void)
c66ac9db 73{
c66ac9db
NB		 74 se_sess_cache = kmem_cache_create("se_sess_cache",
75 sizeof(struct se_session), __alignof__(struct se_session),
76 0, NULL);
6708bb27
AG		 77 if (!se_sess_cache) {
78 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 79 " failed\n");
c8e31f26 80 goto out;
c66ac9db
NB		 81 }
82 se_ua_cache = kmem_cache_create("se_ua_cache",
83 sizeof(struct se_ua), __alignof__(struct se_ua),
84 0, NULL);
6708bb27
AG		 85 if (!se_ua_cache) {
86 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 87 goto out_free_sess_cache;
c66ac9db 88 }
c66ac9db
NB		 89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
90 sizeof(struct t10_pr_registration),
91 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 92 if (!t10_pr_reg_cache) {
93 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 94 " failed\n");
35e0e757 95 goto out_free_ua_cache;
c66ac9db
NB		 96 }
97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
99 0, NULL);
6708bb27
AG		 100 if (!t10_alua_lu_gp_cache) {
101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 102 " failed\n");
35e0e757 103 goto out_free_pr_reg_cache;
c66ac9db
NB		 104 }
105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
106 sizeof(struct t10_alua_lu_gp_member),
107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 108 if (!t10_alua_lu_gp_mem_cache) {
109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 110 "cache failed\n");
35e0e757 111 goto out_free_lu_gp_cache;
c66ac9db
NB		 112 }
113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
114 sizeof(struct t10_alua_tg_pt_gp),
115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 116 if (!t10_alua_tg_pt_gp_cache) {
117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 118 "cache failed\n");
35e0e757 119 goto out_free_lu_gp_mem_cache;
c66ac9db 120 }
229d4f11
HR		 121 t10_alua_lba_map_cache = kmem_cache_create(
122 "t10_alua_lba_map_cache",
123 sizeof(struct t10_alua_lba_map),
124 __alignof__(struct t10_alua_lba_map), 0, NULL);
125 if (!t10_alua_lba_map_cache) {
126 pr_err("kmem_cache_create() for t10_alua_lba_map_"
127 "cache failed\n");
adf653f9 128 goto out_free_tg_pt_gp_cache;
229d4f11
HR		 129 }
130 t10_alua_lba_map_mem_cache = kmem_cache_create(
131 "t10_alua_lba_map_mem_cache",
132 sizeof(struct t10_alua_lba_map_member),
133 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
134 if (!t10_alua_lba_map_mem_cache) {
135 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
136 "cache failed\n");
137 goto out_free_lba_map_cache;
138 }
c66ac9db 139
35e0e757
CH		 140 target_completion_wq = alloc_workqueue("target_completion",
141 WQ_MEM_RECLAIM, 0);
142 if (!target_completion_wq)
229d4f11 143 goto out_free_lba_map_mem_cache;
35e0e757 144
c66ac9db 145 return 0;
35e0e757 146
229d4f11
HR		 147out_free_lba_map_mem_cache:
148 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
149out_free_lba_map_cache:
150 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 151out_free_tg_pt_gp_cache:
152 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
153out_free_lu_gp_mem_cache:
154 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
155out_free_lu_gp_cache:
156 kmem_cache_destroy(t10_alua_lu_gp_cache);
157out_free_pr_reg_cache:
158 kmem_cache_destroy(t10_pr_reg_cache);
159out_free_ua_cache:
160 kmem_cache_destroy(se_ua_cache);
161out_free_sess_cache:
162 kmem_cache_destroy(se_sess_cache);
c66ac9db 163out:
e3d6f909 164 return -ENOMEM;
c66ac9db
NB		 165}
166
e3d6f909 167void release_se_kmem_caches(void)
c66ac9db 168{
35e0e757 169 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 170 kmem_cache_destroy(se_sess_cache);
171 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 172 kmem_cache_destroy(t10_pr_reg_cache);
173 kmem_cache_destroy(t10_alua_lu_gp_cache);
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
229d4f11
HR		 176 kmem_cache_destroy(t10_alua_lba_map_cache);
177 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 178}
179
e3d6f909
AG		 180/* This code ensures unique mib indexes are handed out. */
181static DEFINE_SPINLOCK(scsi_mib_index_lock);
182static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 183
184/*
185 * Allocate a new row index for the entry type specified
186 */
187u32 scsi_get_new_index(scsi_index_t type)
188{
189 u32 new_index;
190
e3d6f909 191 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 192
e3d6f909
AG		 193 spin_lock(&scsi_mib_index_lock);
194 new_index = ++scsi_mib_index[type];
195 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 196
197 return new_index;
198}
199
dbc5623e 200void transport_subsystem_check_init(void)
c66ac9db
NB		 201{
202 int ret;
283669d2 203 static int sub_api_initialized;
c66ac9db 204
dbc5623e
NB		 205 if (sub_api_initialized)
206 return;
207
c66ac9db
NB		 208 ret = request_module("target_core_iblock");
209 if (ret != 0)
6708bb27 210 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 211
212 ret = request_module("target_core_file");
213 if (ret != 0)
6708bb27 214 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 215
216 ret = request_module("target_core_pscsi");
217 if (ret != 0)
6708bb27 218 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 219
7c9e7a6f
AG		 220 ret = request_module("target_core_user");
221 if (ret != 0)
222 pr_err("Unable to load target_core_user\n");
223
e3d6f909 224 sub_api_initialized = 1;
c66ac9db
NB		 225}
226
e70beee7 227struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 228{
229 struct se_session *se_sess;
230
231 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 232 if (!se_sess) {
233 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 234 " se_sess_cache\n");
235 return ERR_PTR(-ENOMEM);
236 }
237 INIT_LIST_HEAD(&se_sess->sess_list);
238 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 239 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 240 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 241 spin_lock_init(&se_sess->sess_cmd_lock);
e70beee7 242 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 243
244 return se_sess;
245}
246EXPORT_SYMBOL(transport_init_session);
247
c0add7fd
NB		 248int transport_alloc_session_tags(struct se_session *se_sess,
249 unsigned int tag_num, unsigned int tag_size)
250{
251 int rc;
252
8c7f6e9b
NB		 253 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
254 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 255 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 256 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
257 if (!se_sess->sess_cmd_map) {
258 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
259 return -ENOMEM;
260 }
c0add7fd
NB		 261 }
262
263 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
264 if (rc < 0) {
265 pr_err("Unable to init se_sess->sess_tag_pool,"
266 " tag_num: %u\n", tag_num);
de64d3a6 267 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 268 se_sess->sess_cmd_map = NULL;
269 return -ENOMEM;
270 }
271
272 return 0;
273}
274EXPORT_SYMBOL(transport_alloc_session_tags);
275
276struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 277 unsigned int tag_size,
278 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 279{
280 struct se_session *se_sess;
281 int rc;
282
7861728d
NB		 283 if (tag_num != 0 && !tag_size) {
284 pr_err("init_session_tags called with percpu-ida tag_num:"
285 " %u, but zero tag_size\n", tag_num);
286 return ERR_PTR(-EINVAL);
287 }
288 if (!tag_num && tag_size) {
289 pr_err("init_session_tags called with percpu-ida tag_size:"
290 " %u, but zero tag_num\n", tag_size);
291 return ERR_PTR(-EINVAL);
292 }
293
e70beee7 294 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 295 if (IS_ERR(se_sess))
296 return se_sess;
297
298 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
299 if (rc < 0) {
300 transport_free_session(se_sess);
301 return ERR_PTR(-ENOMEM);
302 }
303
304 return se_sess;
305}
306EXPORT_SYMBOL(transport_init_session_tags);
307
c66ac9db 308/*
140854cb 309 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 310 */
311void __transport_register_session(
312 struct se_portal_group *se_tpg,
313 struct se_node_acl *se_nacl,
314 struct se_session *se_sess,
315 void *fabric_sess_ptr)
316{
9ac8928e 317 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 318 unsigned char buf[PR_REG_ISID_LEN];
319
320 se_sess->se_tpg = se_tpg;
321 se_sess->fabric_sess_ptr = fabric_sess_ptr;
322 /*
323 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
324 *
325 * Only set for struct se_session's that will actually be moving I/O.
326 * eg: *NOT* discovery sessions.
327 */
328 if (se_nacl) {
bffb5128
NB		 329 /*
330 *
331 * Determine if fabric allows for T10-PI feature bits exposed to
332 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
333 *
334 * If so, then always save prot_type on a per se_node_acl node
335 * basis and re-instate the previous sess_prot_type to avoid
336 * disabling PI from below any previously initiator side
337 * registered LUNs.
338 */
339 if (se_nacl->saved_prot_type)
340 se_sess->sess_prot_type = se_nacl->saved_prot_type;
341 else if (tfo->tpg_check_prot_fabric_only)
342 se_sess->sess_prot_type = se_nacl->saved_prot_type =
343 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 344 /*
345 * If the fabric module supports an ISID based TransportID,
346 * save this value in binary from the fabric I_T Nexus now.
347 */
e3d6f909 348 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 349 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 350 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 351 &buf[0], PR_REG_ISID_LEN);
352 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
353 }
afb999ff 354
c66ac9db
NB		 355 spin_lock_irq(&se_nacl->nacl_sess_lock);
356 /*
357 * The se_nacl->nacl_sess pointer will be set to the
358 * last active I_T Nexus for each struct se_node_acl.
359 */
360 se_nacl->nacl_sess = se_sess;
361
362 list_add_tail(&se_sess->sess_acl_list,
363 &se_nacl->acl_sess_list);
364 spin_unlock_irq(&se_nacl->nacl_sess_lock);
365 }
366 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
367
6708bb27 368 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 369 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 370}
371EXPORT_SYMBOL(__transport_register_session);
372
373void transport_register_session(
374 struct se_portal_group *se_tpg,
375 struct se_node_acl *se_nacl,
376 struct se_session *se_sess,
377 void *fabric_sess_ptr)
378{
140854cb
NB		 379 unsigned long flags;
380
381 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 382 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 383 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 384}
385EXPORT_SYMBOL(transport_register_session);
386
7861728d
NB		 387struct se_session *
388target_alloc_session(struct se_portal_group *tpg,
389 unsigned int tag_num, unsigned int tag_size,
390 enum target_prot_op prot_op,
391 const char *initiatorname, void *private,
392 int (*callback)(struct se_portal_group *,
393 struct se_session *, void *))
394{
395 struct se_session *sess;
396
397 /*
398 * If the fabric driver is using percpu-ida based pre allocation
399 * of I/O descriptor tags, go ahead and perform that setup now..
400 */
401 if (tag_num != 0)
402 sess = transport_init_session_tags(tag_num, tag_size, prot_op);
403 else
404 sess = transport_init_session(prot_op);
405
406 if (IS_ERR(sess))
407 return sess;
408
409 sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
410 (unsigned char *)initiatorname);
411 if (!sess->se_node_acl) {
412 transport_free_session(sess);
413 return ERR_PTR(-EACCES);
414 }
415 /*
416 * Go ahead and perform any remaining fabric setup that is
417 * required before transport_register_session().
418 */
419 if (callback != NULL) {
420 int rc = callback(tpg, sess, private);
421 if (rc) {
422 transport_free_session(sess);
423 return ERR_PTR(rc);
424 }
425 }
426
427 transport_register_session(tpg, sess->se_node_acl, sess, private);
428 return sess;
429}
430EXPORT_SYMBOL(target_alloc_session);
431
f8e471f9
NB		 432ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
433{
434 struct se_session *se_sess;
435 ssize_t len = 0;
436
437 spin_lock_bh(&se_tpg->session_lock);
438 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
439 if (!se_sess->se_node_acl)
440 continue;
441 if (!se_sess->se_node_acl->dynamic_node_acl)
442 continue;
443 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
444 break;
445
446 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
447 se_sess->se_node_acl->initiatorname);
448 len += 1; /* Include NULL terminator */
449 }
450 spin_unlock_bh(&se_tpg->session_lock);
451
452 return len;
453}
454EXPORT_SYMBOL(target_show_dynamic_sessions);
455
afb999ff
NB		 456static void target_complete_nacl(struct kref *kref)
457{
458 struct se_node_acl *nacl = container_of(kref,
459 struct se_node_acl, acl_kref);
460
461 complete(&nacl->acl_free_comp);
462}
463
464void target_put_nacl(struct se_node_acl *nacl)
465{
466 kref_put(&nacl->acl_kref, target_complete_nacl);
467}
21aaa23b 468EXPORT_SYMBOL(target_put_nacl);
afb999ff 469
c66ac9db
NB		 470void transport_deregister_session_configfs(struct se_session *se_sess)
471{
472 struct se_node_acl *se_nacl;
23388864 473 unsigned long flags;
c66ac9db
NB		 474 /*
475 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
476 */
477 se_nacl = se_sess->se_node_acl;
6708bb27 478 if (se_nacl) {
23388864 479 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
fba81f88
CH		 480 if (!list_empty(&se_sess->sess_acl_list))
481 list_del_init(&se_sess->sess_acl_list);
c66ac9db
NB		 482 /*
483 * If the session list is empty, then clear the pointer.
484 * Otherwise, set the struct se_session pointer from the tail
485 * element of the per struct se_node_acl active session list.
486 */
487 if (list_empty(&se_nacl->acl_sess_list))
488 se_nacl->nacl_sess = NULL;
489 else {
490 se_nacl->nacl_sess = container_of(
491 se_nacl->acl_sess_list.prev,
492 struct se_session, sess_acl_list);
493 }
23388864 494 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 495 }
496}
497EXPORT_SYMBOL(transport_deregister_session_configfs);
498
499void transport_free_session(struct se_session *se_sess)
500{
21aaa23b
NB		 501 struct se_node_acl *se_nacl = se_sess->se_node_acl;
502 /*
503 * Drop the se_node_acl->nacl_kref obtained from within
504 * core_tpg_get_initiator_node_acl().
505 */
506 if (se_nacl) {
507 se_sess->se_node_acl = NULL;
508 target_put_nacl(se_nacl);
509 }
c0add7fd
NB		 510 if (se_sess->sess_cmd_map) {
511 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 512 kvfree(se_sess->sess_cmd_map);
c0add7fd 513 }
c66ac9db
NB		 514 kmem_cache_free(se_sess_cache, se_sess);
515}
516EXPORT_SYMBOL(transport_free_session);
517
518void transport_deregister_session(struct se_session *se_sess)
519{
520 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 521 const struct target_core_fabric_ops *se_tfo;
c66ac9db 522 struct se_node_acl *se_nacl;
e63a8e19 523 unsigned long flags;
21aaa23b 524 bool drop_nacl = false;
c66ac9db 525
6708bb27 526 if (!se_tpg) {
c66ac9db
NB		 527 transport_free_session(se_sess);
528 return;
529 }
01468346 530 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 531
e63a8e19 532 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 533 list_del(&se_sess->sess_list);
534 se_sess->se_tpg = NULL;
535 se_sess->fabric_sess_ptr = NULL;
e63a8e19 536 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 537
538 /*
539 * Determine if we need to do extra work for this initiator node's
540 * struct se_node_acl if it had been previously dynamically generated.
541 */
542 se_nacl = se_sess->se_node_acl;
01468346 543
403edd78 544 mutex_lock(&se_tpg->acl_node_mutex);
01468346
NB		 545 if (se_nacl && se_nacl->dynamic_node_acl) {
546 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
547 list_del(&se_nacl->acl_list);
403edd78 548 drop_nacl = true;
c66ac9db 549 }
c66ac9db 550 }
403edd78 551 mutex_unlock(&se_tpg->acl_node_mutex);
c66ac9db 552
403edd78
NB		 553 if (drop_nacl) {
554 core_tpg_wait_for_nacl_pr_ref(se_nacl);
555 core_free_device_list_for_node(se_nacl, se_tpg);
21aaa23b 556 se_sess->se_node_acl = NULL;
403edd78 557 kfree(se_nacl);
403edd78 558 }
6708bb27 559 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 560 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 561 /*
125d0119 562 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff 563 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
21aaa23b 564 * removal context from within transport_free_session() code.
01468346 565 */
01468346 566
afb999ff 567 transport_free_session(se_sess);
c66ac9db
NB		 568}
569EXPORT_SYMBOL(transport_deregister_session);
570
cf572a96 571static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 572{
42bf829e 573 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 574 unsigned long flags;
575
42bf829e
CH		 576 if (!dev)
577 return;
c66ac9db 578
cf572a96
CH		 579 if (cmd->transport_state & CMD_T_BUSY)
580 return;
c66ac9db 581
cf572a96
CH		 582 spin_lock_irqsave(&dev->execute_task_lock, flags);
583 if (cmd->state_active) {
584 list_del(&cmd->state_list);
cf572a96 585 cmd->state_active = false;
c66ac9db 586 }
cf572a96 587 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 588}
589
862e6389
NB		 590static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
591 bool write_pending)
c66ac9db
NB		 592{
593 unsigned long flags;
594
f7113a47
CH		 595 if (remove_from_lists) {
596 target_remove_from_state_list(cmd);
597
598 /*
599 * Clear struct se_cmd->se_lun before the handoff to FE.
600 */
601 cmd->se_lun = NULL;
602 }
603
febe562c
NB		 604 spin_lock_irqsave(&cmd->t_state_lock, flags);
605 if (write_pending)
606 cmd->t_state = TRANSPORT_WRITE_PENDING;
607
c66ac9db
NB		 608 /*
609 * Determine if frontend context caller is requesting the stopping of
e3d6f909 610 * this command for frontend exceptions.
c66ac9db 611 */
7d680f3b 612 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 613 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
614 __func__, __LINE__, cmd->tag);
c66ac9db 615
a1d8b49a 616 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 617
a95d6511 618 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 619 return 1;
620 }
f7113a47
CH		 621
622 cmd->transport_state &= ~CMD_T_ACTIVE;
623 if (remove_from_lists) {
624 /*
625 * Some fabric modules like tcm_loop can release
626 * their internally allocated I/O reference now and
627 * struct se_cmd now.
628 *
629 * Fabric modules are expected to return '1' here if the
630 * se_cmd being passed is released at this point,
631 * or zero if not being released.
632 */
633 if (cmd->se_tfo->check_stop_free != NULL) {
634 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
635 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 636 }
f7113a47 637 }
c66ac9db 638
a1d8b49a 639 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 640 return 0;
641}
642
643static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
644{
862e6389 645 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 646}
647
648static void transport_lun_remove_cmd(struct se_cmd *cmd)
649{
e3d6f909 650 struct se_lun *lun = cmd->se_lun;
c66ac9db 651
5259a06e 652 if (!lun)
c66ac9db
NB		 653 return;
654
5259a06e
NB		 655 if (cmpxchg(&cmd->lun_ref_active, true, false))
656 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 657}
658
659void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
660{
febe562c
NB		 661 bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
662
68259b5a
AL		 663 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
664 transport_lun_remove_cmd(cmd);
131e6abc
NB		 665 /*
666 * Allow the fabric driver to unmap any resources before
667 * releasing the descriptor via TFO->release_cmd()
668 */
669 if (remove)
670 cmd->se_tfo->aborted_task(cmd);
68259b5a 671
c66ac9db
NB		 672 if (transport_cmd_check_stop_to_fabric(cmd))
673 return;
febe562c 674 if (remove && ack_kref)
e6a2573f 675 transport_put_cmd(cmd);
c66ac9db
NB		 676}
677
35e0e757
CH		 678static void target_complete_failure_work(struct work_struct *work)
679{
680 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
681
de103c93
CH		 682 transport_generic_request_failure(cmd,
683 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 684}
685
6138ed2a 686/*
d5829eac
PB		 687 * Used when asking transport to copy Sense Data from the underlying
688 * Linux/SCSI struct scsi_cmnd
6138ed2a 689 */
d5829eac 690static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 691{
6138ed2a 692 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 693
694 WARN_ON(!cmd->se_lun);
695
696 if (!dev)
d5829eac 697 return NULL;
6138ed2a 698
d5829eac
PB		 699 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
700 return NULL;
6138ed2a 701
9c58b7dd 702 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 703
d5829eac 704 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 705 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 706 return cmd->sense_buffer;
6138ed2a
PB		 707}
708
5787cacd 709void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 710{
42bf829e 711 struct se_device *dev = cmd->se_dev;
5787cacd 712 int success = scsi_status == GOOD;
c66ac9db 713 unsigned long flags;
c66ac9db 714
5787cacd
CH		 715 cmd->scsi_status = scsi_status;
716
717
a1d8b49a 718 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 719 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 720
c66ac9db 721 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 722 dev->transport->transport_complete(cmd,
723 cmd->t_data_sg,
724 transport_get_sense_buffer(cmd));
725 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 726 success = 1;
c66ac9db
NB		 727 }
728
3d28934a 729 /*
125d0119 730 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 731 * and transport_wait_for_tasks() will be waiting for completion..
732 */
febe562c 733 if (cmd->transport_state & CMD_T_ABORTED ||
3d28934a
NB		 734 cmd->transport_state & CMD_T_STOP) {
735 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 736 complete_all(&cmd->t_transport_stop_comp);
3d28934a 737 return;
3dca1471 738 } else if (!success) {
35e0e757 739 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 740 } else {
35e0e757 741 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 742 }
35e0e757 743
35e0e757 744 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 745 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 746 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 747
9095adaa 748 if (cmd->se_cmd_flags & SCF_USE_CPUID)
fb3269ba 749 queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
9095adaa
QT		 750 else
751 queue_work(target_completion_wq, &cmd->work);
c66ac9db 752}
6bb35e00
CH		 753EXPORT_SYMBOL(target_complete_cmd);
754
2426bd45
RD		 755void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
756{
757 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
758 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
759 cmd->residual_count += cmd->data_length - length;
760 } else {
761 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
762 cmd->residual_count = cmd->data_length - length;
763 }
764
765 cmd->data_length = length;
766 }
767
768 target_complete_cmd(cmd, scsi_status);
769}
770EXPORT_SYMBOL(target_complete_cmd_with_length);
771
cf572a96 772static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 773{
cf572a96
CH		 774 struct se_device *dev = cmd->se_dev;
775 unsigned long flags;
c66ac9db 776
cf572a96
CH		 777 spin_lock_irqsave(&dev->execute_task_lock, flags);
778 if (!cmd->state_active) {
779 list_add_tail(&cmd->state_list, &dev->state_list);
780 cmd->state_active = true;
c66ac9db 781 }
cf572a96 782 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 783}
784
07bde79a 785/*
f147abb4 786 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 787 */
7a6f0a1e
CH		 788static void transport_write_pending_qf(struct se_cmd *cmd);
789static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 790
0fd97ccf 791void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 792{
793 struct se_device *dev = container_of(work, struct se_device,
794 qf_work_queue);
bcac364a 795 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 796 struct se_cmd *cmd, *cmd_tmp;
797
798 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 799 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
800 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 801
bcac364a 802 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 803 list_del(&cmd->se_qf_node);
33940d09 804 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 805
6708bb27 806 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 807 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 808 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 809 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
810 : "UNKNOWN");
f7a5cc0b 811
7a6f0a1e
CH		 812 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
813 transport_write_pending_qf(cmd);
814 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
815 transport_complete_qf(cmd);
07bde79a 816 }
07bde79a
NB		 817}
818
c66ac9db
NB		 819unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
820{
821 switch (cmd->data_direction) {
822 case DMA_NONE:
823 return "NONE";
824 case DMA_FROM_DEVICE:
825 return "READ";
826 case DMA_TO_DEVICE:
827 return "WRITE";
828 case DMA_BIDIRECTIONAL:
829 return "BIDI";
830 default:
831 break;
832 }
833
834 return "UNKNOWN";
835}
836
837void transport_dump_dev_state(
838 struct se_device *dev,
839 char *b,
840 int *bl)
841{
842 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 843 if (dev->export_count)
c66ac9db 844 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 845 else
c66ac9db 846 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 847
5f41a31d 848 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 849 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 850 dev->dev_attrib.block_size,
851 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 852 *bl += sprintf(b + *bl, " ");
853}
854
c66ac9db
NB		 855void transport_dump_vpd_proto_id(
856 struct t10_vpd *vpd,
857 unsigned char *p_buf,
858 int p_buf_len)
859{
860 unsigned char buf[VPD_TMP_BUF_SIZE];
861 int len;
862
863 memset(buf, 0, VPD_TMP_BUF_SIZE);
864 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
865
866 switch (vpd->protocol_identifier) {
867 case 0x00:
868 sprintf(buf+len, "Fibre Channel\n");
869 break;
870 case 0x10:
871 sprintf(buf+len, "Parallel SCSI\n");
872 break;
873 case 0x20:
874 sprintf(buf+len, "SSA\n");
875 break;
876 case 0x30:
877 sprintf(buf+len, "IEEE 1394\n");
878 break;
879 case 0x40:
880 sprintf(buf+len, "SCSI Remote Direct Memory Access"
881 " Protocol\n");
882 break;
883 case 0x50:
884 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
885 break;
886 case 0x60:
887 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
888 break;
889 case 0x70:
890 sprintf(buf+len, "Automation/Drive Interface Transport"
891 " Protocol\n");
892 break;
893 case 0x80:
894 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
895 break;
896 default:
897 sprintf(buf+len, "Unknown 0x%02x\n",
898 vpd->protocol_identifier);
899 break;
900 }
901
902 if (p_buf)
903 strncpy(p_buf, buf, p_buf_len);
904 else
6708bb27 905 pr_debug("%s", buf);
c66ac9db
NB		 906}
907
908void
909transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
910{
911 /*
912 * Check if the Protocol Identifier Valid (PIV) bit is set..
913 *
914 * from spc3r23.pdf section 7.5.1
915 */
916 if (page_83[1] & 0x80) {
917 vpd->protocol_identifier = (page_83[0] & 0xf0);
918 vpd->protocol_identifier_set = 1;
919 transport_dump_vpd_proto_id(vpd, NULL, 0);
920 }
921}
922EXPORT_SYMBOL(transport_set_vpd_proto_id);
923
924int transport_dump_vpd_assoc(
925 struct t10_vpd *vpd,
926 unsigned char *p_buf,
927 int p_buf_len)
928{
929 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 930 int ret = 0;
931 int len;
c66ac9db
NB		 932
933 memset(buf, 0, VPD_TMP_BUF_SIZE);
934 len = sprintf(buf, "T10 VPD Identifier Association: ");
935
936 switch (vpd->association) {
937 case 0x00:
938 sprintf(buf+len, "addressed logical unit\n");
939 break;
940 case 0x10:
941 sprintf(buf+len, "target port\n");
942 break;
943 case 0x20:
944 sprintf(buf+len, "SCSI target device\n");
945 break;
946 default:
947 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 948 ret = -EINVAL;
c66ac9db
NB		 949 break;
950 }
951
952 if (p_buf)
953 strncpy(p_buf, buf, p_buf_len);
954 else
6708bb27 955 pr_debug("%s", buf);
c66ac9db
NB		 956
957 return ret;
958}
959
960int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
961{
962 /*
963 * The VPD identification association..
964 *
965 * from spc3r23.pdf Section 7.6.3.1 Table 297
966 */
967 vpd->association = (page_83[1] & 0x30);
968 return transport_dump_vpd_assoc(vpd, NULL, 0);
969}
970EXPORT_SYMBOL(transport_set_vpd_assoc);
971
972int transport_dump_vpd_ident_type(
973 struct t10_vpd *vpd,
974 unsigned char *p_buf,
975 int p_buf_len)
976{
977 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 978 int ret = 0;
979 int len;
c66ac9db
NB		 980
981 memset(buf, 0, VPD_TMP_BUF_SIZE);
982 len = sprintf(buf, "T10 VPD Identifier Type: ");
983
984 switch (vpd->device_identifier_type) {
985 case 0x00:
986 sprintf(buf+len, "Vendor specific\n");
987 break;
988 case 0x01:
989 sprintf(buf+len, "T10 Vendor ID based\n");
990 break;
991 case 0x02:
992 sprintf(buf+len, "EUI-64 based\n");
993 break;
994 case 0x03:
995 sprintf(buf+len, "NAA\n");
996 break;
997 case 0x04:
998 sprintf(buf+len, "Relative target port identifier\n");
999 break;
1000 case 0x08:
1001 sprintf(buf+len, "SCSI name string\n");
1002 break;
1003 default:
1004 sprintf(buf+len, "Unsupported: 0x%02x\n",
1005 vpd->device_identifier_type);
e3d6f909 1006 ret = -EINVAL;
c66ac9db
NB		 1007 break;
1008 }
1009
e3d6f909
AG		 1010 if (p_buf) {
1011 if (p_buf_len < strlen(buf)+1)
1012 return -EINVAL;
c66ac9db 1013 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1014 } else {
6708bb27 1015 pr_debug("%s", buf);
e3d6f909 1016 }
c66ac9db
NB		 1017
1018 return ret;
1019}
1020
1021int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1022{
1023 /*
1024 * The VPD identifier type..
1025 *
1026 * from spc3r23.pdf Section 7.6.3.1 Table 298
1027 */
1028 vpd->device_identifier_type = (page_83[1] & 0x0f);
1029 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1030}
1031EXPORT_SYMBOL(transport_set_vpd_ident_type);
1032
1033int transport_dump_vpd_ident(
1034 struct t10_vpd *vpd,
1035 unsigned char *p_buf,
1036 int p_buf_len)
1037{
1038 unsigned char buf[VPD_TMP_BUF_SIZE];
1039 int ret = 0;
1040
1041 memset(buf, 0, VPD_TMP_BUF_SIZE);
1042
1043 switch (vpd->device_identifier_code_set) {
1044 case 0x01: /* Binary */
703d641d
DC		 1045 snprintf(buf, sizeof(buf),
1046 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1047 &vpd->device_identifier[0]);
1048 break;
1049 case 0x02: /* ASCII */
703d641d
DC		 1050 snprintf(buf, sizeof(buf),
1051 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1052 &vpd->device_identifier[0]);
1053 break;
1054 case 0x03: /* UTF-8 */
703d641d
DC		 1055 snprintf(buf, sizeof(buf),
1056 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1057 &vpd->device_identifier[0]);
1058 break;
1059 default:
1060 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1061 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1062 ret = -EINVAL;
c66ac9db
NB		 1063 break;
1064 }
1065
1066 if (p_buf)
1067 strncpy(p_buf, buf, p_buf_len);
1068 else
6708bb27 1069 pr_debug("%s", buf);
c66ac9db
NB		 1070
1071 return ret;
1072}
1073
1074int
1075transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1076{
1077 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1078 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1079
1080 /*
1081 * The VPD Code Set (encoding)
1082 *
1083 * from spc3r23.pdf Section 7.6.3.1 Table 296
1084 */
1085 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1086 switch (vpd->device_identifier_code_set) {
1087 case 0x01: /* Binary */
1088 vpd->device_identifier[j++] =
1089 hex_str[vpd->device_identifier_type];
1090 while (i < (4 + page_83[3])) {
1091 vpd->device_identifier[j++] =
1092 hex_str[(page_83[i] & 0xf0) >> 4];
1093 vpd->device_identifier[j++] =
1094 hex_str[page_83[i] & 0x0f];
1095 i++;
1096 }
1097 break;
1098 case 0x02: /* ASCII */
1099 case 0x03: /* UTF-8 */
1100 while (i < (4 + page_83[3]))
1101 vpd->device_identifier[j++] = page_83[i++];
1102 break;
1103 default:
1104 break;
1105 }
1106
1107 return transport_dump_vpd_ident(vpd, NULL, 0);
1108}
1109EXPORT_SYMBOL(transport_set_vpd_ident);
1110
8f9b5654
NB		 1111static sense_reason_t
1112target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
1113 unsigned int size)
1114{
1115 u32 mtl;
1116
1117 if (!cmd->se_tfo->max_data_sg_nents)
1118 return TCM_NO_SENSE;
1119 /*
1120 * Check if fabric enforced maximum SGL entries per I/O descriptor
1121 * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
1122 * residual_count and reduce original cmd->data_length to maximum
1123 * length based on single PAGE_SIZE entry scatter-lists.
1124 */
1125 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
1126 if (cmd->data_length > mtl) {
1127 /*
1128 * If an existing CDB overflow is present, calculate new residual
1129 * based on CDB size minus fabric maximum transfer length.
1130 *
1131 * If an existing CDB underflow is present, calculate new residual
1132 * based on original cmd->data_length minus fabric maximum transfer
1133 * length.
1134 *
1135 * Otherwise, set the underflow residual based on cmd->data_length
1136 * minus fabric maximum transfer length.
1137 */
1138 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1139 cmd->residual_count = (size - mtl);
1140 } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1141 u32 orig_dl = size + cmd->residual_count;
1142 cmd->residual_count = (orig_dl - mtl);
1143 } else {
1144 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1145 cmd->residual_count = (cmd->data_length - mtl);
1146 }
1147 cmd->data_length = mtl;
1148 /*
1149 * Reset sbc_check_prot() calculated protection payload
1150 * length based upon the new smaller MTL.
1151 */
1152 if (cmd->prot_length) {
1153 u32 sectors = (mtl / dev->dev_attrib.block_size);
1154 cmd->prot_length = dev->prot_length * sectors;
1155 }
1156 }
1157 return TCM_NO_SENSE;
1158}
1159
de103c93
CH		 1160sense_reason_t
1161target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1162{
1163 struct se_device *dev = cmd->se_dev;
1164
1165 if (cmd->unknown_data_length) {
1166 cmd->data_length = size;
1167 } else if (size != cmd->data_length) {
1168 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1169 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1170 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1171 cmd->data_length, size, cmd->t_task_cdb[0]);
1172
c72c5250
RD		 1173 if (cmd->data_direction == DMA_TO_DEVICE &&
1174 cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1175 pr_err("Rejecting underflow/overflow WRITE data\n");
de103c93 1176 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1177 }
1178 /*
1179 * Reject READ_* or WRITE_* with overflow/underflow for
1180 * type SCF_SCSI_DATA_CDB.
1181 */
0fd97ccf 1182 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1183 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1184 " CDB on non 512-byte sector setup subsystem"
1185 " plugin: %s\n", dev->transport->name);
1186 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1187 return TCM_INVALID_CDB_FIELD;
9b3b8041 1188 }
4c054ba6
NB		 1189 /*
1190 * For the overflow case keep the existing fabric provided
1191 * ->data_length. Otherwise for the underflow case, reset
1192 * ->data_length to the smaller SCSI expected data transfer
1193 * length.
1194 */
9b3b8041
CH		 1195 if (size > cmd->data_length) {
1196 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1197 cmd->residual_count = (size - cmd->data_length);
1198 } else {
1199 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1200 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1201 cmd->data_length = size;
9b3b8041 1202 }
9b3b8041
CH		 1203 }
1204
8f9b5654 1205 return target_check_max_data_sg_nents(cmd, dev, size);
9b3b8041 1206
9b3b8041
CH		 1207}
1208
c66ac9db
NB		 1209/*
1210 * Used by fabric modules containing a local struct se_cmd within their
1211 * fabric dependent per I/O descriptor.
649ee054
BVA		 1212 *
1213 * Preserves the value of @cmd->tag.
c66ac9db
NB		 1214 */
1215void transport_init_se_cmd(
1216 struct se_cmd *cmd,
9ac8928e 1217 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1218 struct se_session *se_sess,
1219 u32 data_length,
1220 int data_direction,
1221 int task_attr,
1222 unsigned char *sense_buffer)
1223{
5951146d 1224 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1225 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1226 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1227 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1228 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1229 init_completion(&cmd->cmd_wait_comp);
a1d8b49a 1230 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1231 kref_init(&cmd->cmd_kref);
7d680f3b 1232 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1233
1234 cmd->se_tfo = tfo;
1235 cmd->se_sess = se_sess;
1236 cmd->data_length = data_length;
1237 cmd->data_direction = data_direction;
1238 cmd->sam_task_attr = task_attr;
1239 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1240
1241 cmd->state_active = false;
c66ac9db
NB		 1242}
1243EXPORT_SYMBOL(transport_init_se_cmd);
1244
de103c93
CH		 1245static sense_reason_t
1246transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1247{
019c4ca6
CH		 1248 struct se_device *dev = cmd->se_dev;
1249
c66ac9db
NB		 1250 /*
1251 * Check if SAM Task Attribute emulation is enabled for this
1252 * struct se_device storage object
1253 */
a3541703 1254 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1255 return 0;
1256
68d81f40 1257 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1258 pr_debug("SAM Task Attribute ACA"
c66ac9db 1259 " emulation is not supported\n");
de103c93 1260 return TCM_INVALID_CDB_FIELD;
c66ac9db 1261 }
9c31820b 1262
c66ac9db
NB		 1263 return 0;
1264}
1265
de103c93
CH		 1266sense_reason_t
1267target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1268{
0fd97ccf 1269 struct se_device *dev = cmd->se_dev;
de103c93 1270 sense_reason_t ret;
c66ac9db 1271
c66ac9db
NB		 1272 /*
1273 * Ensure that the received CDB is less than the max (252 + 8) bytes
1274 * for VARIABLE_LENGTH_CMD
1275 */
1276 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1277 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1278 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1279 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1280 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1281 }
1282 /*
1283 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1284 * allocate the additional extended CDB buffer now.. Otherwise
1285 * setup the pointer from __t_task_cdb to t_task_cdb.
1286 */
a1d8b49a
AG		 1287 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1288 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1289 GFP_KERNEL);
6708bb27
AG		 1290 if (!cmd->t_task_cdb) {
1291 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1292 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1293 scsi_command_size(cdb),
a1d8b49a 1294 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1295 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1296 }
1297 } else
a1d8b49a 1298 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1299 /*
a1d8b49a 1300 * Copy the original CDB into cmd->
c66ac9db 1301 */
a1d8b49a 1302 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1303
e5c0d6ad
RD		 1304 trace_target_sequencer_start(cmd);
1305
0fd97ccf 1306 ret = dev->transport->parse_cdb(cmd);
568e1f65
JE		 1307 if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
1308 pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
1309 cmd->se_tfo->get_fabric_name(),
1310 cmd->se_sess->se_node_acl->initiatorname,
1311 cmd->t_task_cdb[0]);
de103c93
CH		 1312 if (ret)
1313 return ret;
1314
1315 ret = transport_check_alloc_task_attr(cmd);
1316 if (ret)
c66ac9db 1317 return ret;
cb4f4d3c 1318
cb4f4d3c 1319 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
4cc987ea 1320 atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
c66ac9db
NB		 1321 return 0;
1322}
a12f41f8 1323EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1324
695434e1
NB		 1325/*
1326 * Used by fabric module frontends to queue tasks directly.
ac75d8be 1327 * May only be used from process context.
695434e1
NB		 1328 */
1329int transport_handle_cdb_direct(
1330 struct se_cmd *cmd)
1331{
de103c93 1332 sense_reason_t ret;
dd8ae59d 1333
695434e1
NB		 1334 if (!cmd->se_lun) {
1335 dump_stack();
6708bb27 1336 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1337 return -EINVAL;
1338 }
1339 if (in_interrupt()) {
1340 dump_stack();
6708bb27 1341 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1342 " from interrupt context\n");
1343 return -EINVAL;
1344 }
dd8ae59d 1345 /*
af877292
CH		 1346 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1347 * outstanding descriptors are handled correctly during shutdown via
1348 * transport_wait_for_tasks()
dd8ae59d
NB		 1349 *
1350 * Also, we don't take cmd->t_state_lock here as we only expect
1351 * this to be called for initial descriptor submission.
1352 */
1353 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1354 cmd->transport_state |= CMD_T_ACTIVE;
1355
dd8ae59d
NB		 1356 /*
1357 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1358 * so follow TRANSPORT_NEW_CMD processing thread context usage
1359 * and call transport_generic_request_failure() if necessary..
1360 */
1361 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1362 if (ret)
1363 transport_generic_request_failure(cmd, ret);
dd8ae59d 1364 return 0;
695434e1
NB		 1365}
1366EXPORT_SYMBOL(transport_handle_cdb_direct);
1367
c5ff8d6b 1368sense_reason_t
de103c93
CH		 1369transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1370 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1371{
1372 if (!sgl || !sgl_count)
1373 return 0;
1374
1375 /*
1376 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1377 * scatterlists already have been set to follow what the fabric
1378 * passes for the original expected data transfer length.
1379 */
1380 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1381 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1382 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1383 return TCM_INVALID_CDB_FIELD;
1384 }
1385
1386 cmd->t_data_sg = sgl;
1387 cmd->t_data_nents = sgl_count;
b32bd0a8
IT		 1388 cmd->t_bidi_data_sg = sgl_bidi;
1389 cmd->t_bidi_data_nents = sgl_bidi_count;
de103c93 1390
de103c93
CH		 1391 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1392 return 0;
1393}
1394
a026757f
NB		 1395/*
1396 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1397 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1398 *
1399 * @se_cmd: command descriptor to submit
1400 * @se_sess: associated se_sess for endpoint
1401 * @cdb: pointer to SCSI CDB
1402 * @sense: pointer to SCSI sense buffer
1403 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1404 * @data_length: fabric expected data transfer length
1405 * @task_addr: SAM task attribute
1406 * @data_dir: DMA data direction
1407 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1408 * @sgl: struct scatterlist memory for unidirectional mapping
1409 * @sgl_count: scatterlist count for unidirectional mapping
1410 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1411 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1412 * @sgl_prot: struct scatterlist memory protection information
1413 * @sgl_prot_count: scatterlist count for protection information
a6360785 1414 *
649ee054
BVA		 1415 * Task tags are supported if the caller has set @se_cmd->tag.
1416 *
d6dfc868
RD		 1417 * Returns non zero to signal active I/O shutdown failure. All other
1418 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1419 * but still return zero here.
1420 *
a6360785
NB		 1421 * This may only be called from process context, and also currently
1422 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1423 */
1424int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1425 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1426 u32 data_length, int task_attr, int data_dir, int flags,
1427 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1428 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1429 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1430{
1431 struct se_portal_group *se_tpg;
de103c93
CH		 1432 sense_reason_t rc;
1433 int ret;
a6360785
NB		 1434
1435 se_tpg = se_sess->se_tpg;
1436 BUG_ON(!se_tpg);
1437 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1438 BUG_ON(in_interrupt());
1439 /*
1440 * Initialize se_cmd for target operation. From this point
1441 * exceptions are handled by sending exception status via
1442 * target_core_fabric_ops->queue_status() callback
1443 */
1444 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1445 data_length, data_dir, task_attr, sense);
9095adaa
QT		 1446
1447 if (flags & TARGET_SCF_USE_CPUID)
1448 se_cmd->se_cmd_flags |= SCF_USE_CPUID;
1449 else
1450 se_cmd->cpuid = WORK_CPU_UNBOUND;
1451
b0d79946
SAS		 1452 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1453 se_cmd->unknown_data_length = 1;
a6360785
NB		 1454 /*
1455 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1456 * se_sess->sess_cmd_list. A second kref_get here is necessary
1457 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1458 * kref_put() to happen during fabric packet acknowledgement.
1459 */
afc16604 1460 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
de103c93
CH		 1461 if (ret)
1462 return ret;
a6360785
NB		 1463 /*
1464 * Signal bidirectional data payloads to target-core
1465 */
1466 if (flags & TARGET_SCF_BIDI_OP)
1467 se_cmd->se_cmd_flags |= SCF_BIDI;
1468 /*
1469 * Locate se_lun pointer and attach it to struct se_cmd
1470 */
de103c93
CH		 1471 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1472 if (rc) {
1473 transport_send_check_condition_and_sense(se_cmd, rc, 0);
afc16604 1474 target_put_sess_cmd(se_cmd);
d6dfc868 1475 return 0;
735703ca 1476 }
b5b8e298
SG		 1477
1478 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1479 if (rc != 0) {
1480 transport_generic_request_failure(se_cmd, rc);
1481 return 0;
1482 }
1483
def2b339
NB		 1484 /*
1485 * Save pointers for SGLs containing protection information,
1486 * if present.
1487 */
1488 if (sgl_prot_count) {
1489 se_cmd->t_prot_sg = sgl_prot;
1490 se_cmd->t_prot_nents = sgl_prot_count;
5835812f 1491 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
def2b339 1492 }
d6e0175c 1493
a026757f
NB		 1494 /*
1495 * When a non zero sgl_count has been passed perform SGL passthrough
1496 * mapping for pre-allocated fabric memory instead of having target
1497 * core perform an internal SGL allocation..
1498 */
1499 if (sgl_count != 0) {
1500 BUG_ON(!sgl);
1501
944981c7
NB		 1502 /*
1503 * A work-around for tcm_loop as some userspace code via
1504 * scsi-generic do not memset their associated read buffers,
1505 * so go ahead and do that here for type non-data CDBs. Also
1506 * note that this is currently guaranteed to be a single SGL
1507 * for this case by target core in target_setup_cmd_from_cdb()
1508 * -> transport_generic_cmd_sequencer().
1509 */
1510 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1511 se_cmd->data_direction == DMA_FROM_DEVICE) {
1512 unsigned char *buf = NULL;
1513
1514 if (sgl)
1515 buf = kmap(sg_page(sgl)) + sgl->offset;
1516
1517 if (buf) {
1518 memset(buf, 0, sgl->length);
1519 kunmap(sg_page(sgl));
1520 }
1521 }
1522
a026757f
NB		 1523 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1524 sgl_bidi, sgl_bidi_count);
1525 if (rc != 0) {
de103c93 1526 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1527 return 0;
1528 }
1529 }
def2b339 1530
11e319ed
AG		 1531 /*
1532 * Check if we need to delay processing because of ALUA
1533 * Active/NonOptimized primary access state..
1534 */
1535 core_alua_check_nonop_delay(se_cmd);
1536
a6360785 1537 transport_handle_cdb_direct(se_cmd);
d6dfc868 1538 return 0;
a6360785 1539}
a026757f
NB		 1540EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1541
1542/*
1543 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1544 *
1545 * @se_cmd: command descriptor to submit
1546 * @se_sess: associated se_sess for endpoint
1547 * @cdb: pointer to SCSI CDB
1548 * @sense: pointer to SCSI sense buffer
1549 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1550 * @data_length: fabric expected data transfer length
1551 * @task_addr: SAM task attribute
1552 * @data_dir: DMA data direction
1553 * @flags: flags for command submission from target_sc_flags_tables
1554 *
649ee054
BVA		 1555 * Task tags are supported if the caller has set @se_cmd->tag.
1556 *
a026757f
NB		 1557 * Returns non zero to signal active I/O shutdown failure. All other
1558 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1559 * but still return zero here.
1560 *
1561 * This may only be called from process context, and also currently
1562 * assumes internal allocation of fabric payload buffer by target-core.
1563 *
1564 * It also assumes interal target core SGL memory allocation.
1565 */
1566int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1567 unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
a026757f
NB		 1568 u32 data_length, int task_attr, int data_dir, int flags)
1569{
1570 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1571 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1572 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1573}
a6360785
NB		 1574EXPORT_SYMBOL(target_submit_cmd);
1575
9f0d05c2
NB		 1576static void target_complete_tmr_failure(struct work_struct *work)
1577{
1578 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1579
1580 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1581 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1582
1583 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1584}
1585
ea98d7f9
AG		 1586/**
1587 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1588 * for TMR CDBs
1589 *
1590 * @se_cmd: command descriptor to submit
1591 * @se_sess: associated se_sess for endpoint
1592 * @sense: pointer to SCSI sense buffer
1593 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1594 * @fabric_context: fabric context for TMR req
1595 * @tm_type: Type of TM request
c0974f89
NB		 1596 * @gfp: gfp type for caller
1597 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1598 * @flags: submit cmd flags
ea98d7f9
AG		 1599 *
1600 * Callable from all contexts.
1601 **/
1602
c7042cae 1603int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
f2d30680 1604 unsigned char *sense, u64 unpacked_lun,
c0974f89 1605 void *fabric_tmr_ptr, unsigned char tm_type,
5261d86c 1606 gfp_t gfp, u64 tag, int flags)
ea98d7f9
AG		 1607{
1608 struct se_portal_group *se_tpg;
1609 int ret;
1610
1611 se_tpg = se_sess->se_tpg;
1612 BUG_ON(!se_tpg);
1613
1614 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1615 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1616 /*
1617 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1618 * allocation failure.
1619 */
c0974f89 1620 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1621 if (ret < 0)
1622 return -ENOMEM;
ea98d7f9 1623
c0974f89
NB		 1624 if (tm_type == TMR_ABORT_TASK)
1625 se_cmd->se_tmr_req->ref_task_tag = tag;
1626
ea98d7f9 1627 /* See target_submit_cmd for commentary */
afc16604 1628 ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
bc187ea6
RD		 1629 if (ret) {
1630 core_tmr_release_req(se_cmd->se_tmr_req);
1631 return ret;
1632 }
ea98d7f9 1633
ea98d7f9
AG		 1634 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1635 if (ret) {
9f0d05c2
NB		 1636 /*
1637 * For callback during failure handling, push this work off
1638 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1639 */
1640 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1641 schedule_work(&se_cmd->work);
c7042cae 1642 return 0;
ea98d7f9
AG		 1643 }
1644 transport_generic_handle_tmr(se_cmd);
c7042cae 1645 return 0;
ea98d7f9
AG		 1646}
1647EXPORT_SYMBOL(target_submit_tmr);
1648
c66ac9db
NB		 1649/*
1650 * Handle SAM-esque emulation for generic transport request failures.
1651 */
de103c93
CH		 1652void transport_generic_request_failure(struct se_cmd *cmd,
1653 sense_reason_t sense_reason)
c66ac9db 1654{
057085e5 1655 int ret = 0, post_ret = 0;
07bde79a 1656
649ee054
BVA		 1657 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
1658 " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
de103c93 1659 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1660 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1661 cmd->t_state, sense_reason);
d43d6aea 1662 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1663 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1664 (cmd->transport_state & CMD_T_STOP) != 0,
1665 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1666
c66ac9db
NB		 1667 /*
1668 * For SAM Task Attribute emulation for failed struct se_cmd
1669 */
019c4ca6 1670 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1671 /*
1672 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1673 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1674 */
1675 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1676 cmd->transport_complete_callback)
057085e5 1677 cmd->transport_complete_callback(cmd, false, &post_ret);
c66ac9db 1678
de103c93 1679 switch (sense_reason) {
03e98c9e
NB		 1680 case TCM_NON_EXISTENT_LUN:
1681 case TCM_UNSUPPORTED_SCSI_OPCODE:
1682 case TCM_INVALID_CDB_FIELD:
1683 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1684 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1685 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1686 case TCM_UNKNOWN_MODE_PAGE:
1687 case TCM_WRITE_PROTECTED:
e2397c70 1688 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1689 case TCM_CHECK_CONDITION_ABORT_CMD:
1690 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1691 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1692 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1693 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1694 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1695 break;
de103c93
CH		 1696 case TCM_OUT_OF_RESOURCES:
1697 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1698 break;
03e98c9e 1699 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1700 /*
1701 * No SENSE Data payload for this case, set SCSI Status
1702 * and queue the response to $FABRIC_MOD.
1703 *
1704 * Uses linux/include/scsi/scsi.h SAM status codes defs
1705 */
1706 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1707 /*
1708 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1709 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1710 * CONFLICT STATUS.
1711 *
1712 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1713 */
e3d6f909 1714 if (cmd->se_sess &&
c51c8e7b
HR		 1715 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) {
1716 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
1717 cmd->orig_fe_lun, 0x2C,
1718 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1719 }
e5c0d6ad 1720 trace_target_cmd_complete(cmd);
c51c8e7b 1721 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1722 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1723 goto queue_full;
c66ac9db 1724 goto check_stop;
c66ac9db 1725 default:
6708bb27 1726 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1727 cmd->t_task_cdb[0], sense_reason);
1728 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1729 break;
1730 }
f3146437 1731
de103c93 1732 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1733 if (ret == -EAGAIN || ret == -ENOMEM)
1734 goto queue_full;
07bde79a 1735
c66ac9db
NB		 1736check_stop:
1737 transport_lun_remove_cmd(cmd);
06b967e4 1738 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1739 return;
1740
1741queue_full:
e057f533
CH		 1742 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1743 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1744}
2fbff127 1745EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1746
dff0ca9e 1747void __target_execute_cmd(struct se_cmd *cmd, bool do_checks)
c66ac9db 1748{
de103c93 1749 sense_reason_t ret;
5f41a31d 1750
dff0ca9e
NB		 1751 if (!cmd->execute_cmd) {
1752 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1753 goto err;
1754 }
1755 if (do_checks) {
1756 /*
1757 * Check for an existing UNIT ATTENTION condition after
1758 * target_handle_task_attr() has done SAM task attr
1759 * checking, and possibly have already defered execution
1760 * out to target_restart_delayed_cmds() context.
1761 */
1762 ret = target_scsi3_ua_check(cmd);
1763 if (ret)
1764 goto err;
1765
1766 ret = target_alua_state_check(cmd);
1767 if (ret)
1768 goto err;
5f41a31d 1769
dff0ca9e
NB		 1770 ret = target_check_reservation(cmd);
1771 if (ret) {
1772 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1773 goto err;
de103c93 1774 }
5f41a31d 1775 }
dff0ca9e
NB		 1776
1777 ret = cmd->execute_cmd(cmd);
1778 if (!ret)
1779 return;
1780err:
1781 spin_lock_irq(&cmd->t_state_lock);
1782 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1783 spin_unlock_irq(&cmd->t_state_lock);
1784
1785 transport_generic_request_failure(cmd, ret);
5f41a31d
CH		 1786}
1787
aa58b531
NB		 1788static int target_write_prot_action(struct se_cmd *cmd)
1789{
5132d1e6 1790 u32 sectors;
aa58b531
NB		 1791 /*
1792 * Perform WRITE_INSERT of PI using software emulation when backend
1793 * device has PI enabled, if the transport has not already generated
1794 * PI using hardware WRITE_INSERT offload.
1795 */
1796 switch (cmd->prot_op) {
1797 case TARGET_PROT_DOUT_INSERT:
1798 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1799 sbc_dif_generate(cmd);
1800 break;
5132d1e6
NB		 1801 case TARGET_PROT_DOUT_STRIP:
1802 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1803 break;
1804
1805 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
f75b6fae
SG		 1806 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
1807 sectors, 0, cmd->t_prot_sg, 0);
5132d1e6
NB		 1808 if (unlikely(cmd->pi_err)) {
1809 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1810 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1811 spin_unlock_irq(&cmd->t_state_lock);
1812 transport_generic_request_failure(cmd, cmd->pi_err);
1813 return -1;
1814 }
1815 break;
aa58b531
NB		 1816 default:
1817 break;
1818 }
1819
1820 return 0;
1821}
1822
019c4ca6 1823static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1824{
1825 struct se_device *dev = cmd->se_dev;
1826
a3541703 1827 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1828 return false;
5f41a31d 1829
410c29df
NB		 1830 cmd->se_cmd_flags |= SCF_TASK_ATTR_SET;
1831
c66ac9db 1832 /*
25985edc 1833 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1834 * to allow the passed struct se_cmd list of tasks to the front of the list.
1835 */
5f41a31d 1836 switch (cmd->sam_task_attr) {
68d81f40 1837 case TCM_HEAD_TAG:
9c31820b
RD		 1838 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
1839 cmd->t_task_cdb[0]);
019c4ca6 1840 return false;
68d81f40 1841 case TCM_ORDERED_TAG:
33940d09 1842 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1843
9c31820b
RD		 1844 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
1845 cmd->t_task_cdb[0]);
5f41a31d 1846
c66ac9db 1847 /*
5f41a31d
CH		 1848 * Execute an ORDERED command if no other older commands
1849 * exist that need to be completed first.
c66ac9db 1850 */
5f41a31d 1851 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1852 return false;
5f41a31d
CH		 1853 break;
1854 default:
c66ac9db
NB		 1855 /*
1856 * For SIMPLE and UNTAGGED Task Attribute commands
1857 */
33940d09 1858 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1859 break;
c66ac9db 1860 }
5f41a31d 1861
019c4ca6
CH		 1862 if (atomic_read(&dev->dev_ordered_sync) == 0)
1863 return false;
c66ac9db 1864
019c4ca6
CH		 1865 spin_lock(&dev->delayed_cmd_lock);
1866 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1867 spin_unlock(&dev->delayed_cmd_lock);
1868
9c31820b
RD		 1869 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
1870 cmd->t_task_cdb[0], cmd->sam_task_attr);
019c4ca6
CH		 1871 return true;
1872}
1873
310d3d31
NB		 1874static int __transport_check_aborted_status(struct se_cmd *, int);
1875
019c4ca6
CH		 1876void target_execute_cmd(struct se_cmd *cmd)
1877{
019c4ca6
CH		 1878 /*
1879 * Determine if frontend context caller is requesting the stopping of
1880 * this command for frontend exceptions.
310d3d31
NB		 1881 *
1882 * If the received CDB has aleady been aborted stop processing it here.
019c4ca6 1883 */
4a9a6c8d 1884 spin_lock_irq(&cmd->t_state_lock);
310d3d31
NB		 1885 if (__transport_check_aborted_status(cmd, 1)) {
1886 spin_unlock_irq(&cmd->t_state_lock);
1887 return;
1888 }
019c4ca6 1889 if (cmd->transport_state & CMD_T_STOP) {
649ee054
BVA		 1890 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
1891 __func__, __LINE__, cmd->tag);
019c4ca6
CH		 1892
1893 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1894 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1895 return;
1896 }
1897
1898 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1899 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1900 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1901
1902 if (target_write_prot_action(cmd))
1903 return;
019c4ca6 1904
1a398b97
NB		 1905 if (target_handle_task_attr(cmd)) {
1906 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1907 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1908 spin_unlock_irq(&cmd->t_state_lock);
1909 return;
1910 }
1911
dff0ca9e 1912 __target_execute_cmd(cmd, true);
c66ac9db 1913}
70baf0ab 1914EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1915
5f41a31d
CH		 1916/*
1917 * Process all commands up to the last received ORDERED task attribute which
1918 * requires another blocking boundary
1919 */
1920static void target_restart_delayed_cmds(struct se_device *dev)
1921{
1922 for (;;) {
1923 struct se_cmd *cmd;
1924
1925 spin_lock(&dev->delayed_cmd_lock);
1926 if (list_empty(&dev->delayed_cmd_list)) {
1927 spin_unlock(&dev->delayed_cmd_lock);
1928 break;
1929 }
1930
1931 cmd = list_entry(dev->delayed_cmd_list.next,
1932 struct se_cmd, se_delayed_node);
1933 list_del(&cmd->se_delayed_node);
1934 spin_unlock(&dev->delayed_cmd_lock);
1935
dff0ca9e 1936 __target_execute_cmd(cmd, true);
5f41a31d 1937
68d81f40 1938 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1939 break;
1940 }
1941}
1942
c66ac9db 1943/*
35e0e757 1944 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1945 * and ordered cmds need to have their tasks added to the execution queue.
1946 */
1947static void transport_complete_task_attr(struct se_cmd *cmd)
1948{
5951146d 1949 struct se_device *dev = cmd->se_dev;
c66ac9db 1950
a3541703 1951 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1952 return;
1953
410c29df
NB		 1954 if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET))
1955 goto restart;
1956
68d81f40 1957 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1958 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1959 dev->dev_cur_ordered_id++;
9c31820b
RD		 1960 pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
1961 dev->dev_cur_ordered_id);
68d81f40 1962 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1963 dev->dev_cur_ordered_id++;
9c31820b
RD		 1964 pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
1965 dev->dev_cur_ordered_id);
68d81f40 1966 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1967 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1968
1969 dev->dev_cur_ordered_id++;
9c31820b
RD		 1970 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
1971 dev->dev_cur_ordered_id);
c66ac9db 1972 }
410c29df 1973restart:
5f41a31d 1974 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1975}
1976
e057f533 1977static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1978{
1979 int ret = 0;
1980
019c4ca6 1981 transport_complete_task_attr(cmd);
e057f533
CH		 1982
1983 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1984 trace_target_cmd_complete(cmd);
e057f533 1985 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1986 goto out;
e057f533 1987 }
07bde79a
NB		 1988
1989 switch (cmd->data_direction) {
1990 case DMA_FROM_DEVICE:
4347ab5a
NB		 1991 if (cmd->scsi_status)
1992 goto queue_status;
1993
e5c0d6ad 1994 trace_target_cmd_complete(cmd);
07bde79a
NB		 1995 ret = cmd->se_tfo->queue_data_in(cmd);
1996 break;
1997 case DMA_TO_DEVICE:
64577407 1998 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1999 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 2000 break;
07bde79a
NB		 2001 }
2002 /* Fall through for DMA_TO_DEVICE */
2003 case DMA_NONE:
4347ab5a 2004queue_status:
e5c0d6ad 2005 trace_target_cmd_complete(cmd);
07bde79a
NB		 2006 ret = cmd->se_tfo->queue_status(cmd);
2007 break;
2008 default:
2009 break;
2010 }
2011
e057f533
CH		 2012out:
2013 if (ret < 0) {
2014 transport_handle_queue_full(cmd, cmd->se_dev);
2015 return;
2016 }
2017 transport_lun_remove_cmd(cmd);
2018 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2019}
2020
2021static void transport_handle_queue_full(
2022 struct se_cmd *cmd,
e057f533 2023 struct se_device *dev)
07bde79a
NB		 2024{
2025 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 2026 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 2027 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 2028 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2029
2030 schedule_work(&cmd->se_dev->qf_work_queue);
2031}
2032
fdeab852 2033static bool target_read_prot_action(struct se_cmd *cmd)
bc005869 2034{
fdeab852
NB		 2035 switch (cmd->prot_op) {
2036 case TARGET_PROT_DIN_STRIP:
2037 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
f75b6fae
SG		 2038 u32 sectors = cmd->data_length >>
2039 ilog2(cmd->se_dev->dev_attrib.block_size);
2040
2041 cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
2042 sectors, 0, cmd->t_prot_sg,
2043 0);
2044 if (cmd->pi_err)
fdeab852 2045 return true;
bc005869 2046 }
fdeab852 2047 break;
72c03850
NB		 2048 case TARGET_PROT_DIN_INSERT:
2049 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2050 break;
2051
2052 sbc_dif_generate(cmd);
2053 break;
fdeab852
NB		 2054 default:
2055 break;
bc005869
NB		 2056 }
2057
2058 return false;
2059}
2060
35e0e757 2061static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2062{
35e0e757 2063 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2064 int ret;
35e0e757 2065
c66ac9db
NB		 2066 /*
2067 * Check if we need to move delayed/dormant tasks from cmds on the
2068 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2069 * Attribute.
2070 */
019c4ca6
CH		 2071 transport_complete_task_attr(cmd);
2072
07bde79a
NB		 2073 /*
2074 * Check to schedule QUEUE_FULL work, or execute an existing
2075 * cmd->transport_qf_callback()
2076 */
2077 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2078 schedule_work(&cmd->se_dev->qf_work_queue);
2079
c66ac9db 2080 /*
d5829eac 2081 * Check if we need to send a sense buffer from
c66ac9db
NB		 2082 * the struct se_cmd in question.
2083 */
2084 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2085 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2086 ret = transport_send_check_condition_and_sense(
2087 cmd, 0, 1);
2088 if (ret == -EAGAIN || ret == -ENOMEM)
2089 goto queue_full;
2090
2091 transport_lun_remove_cmd(cmd);
2092 transport_cmd_check_stop_to_fabric(cmd);
2093 return;
c66ac9db
NB		 2094 }
2095 /*
25985edc 2096 * Check for a callback, used by amongst other things
a6b0133c 2097 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2098 */
a6b0133c
NB		 2099 if (cmd->transport_complete_callback) {
2100 sense_reason_t rc;
057085e5
NB		 2101 bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
2102 bool zero_dl = !(cmd->data_length);
2103 int post_ret = 0;
a6b0133c 2104
057085e5
NB		 2105 rc = cmd->transport_complete_callback(cmd, true, &post_ret);
2106 if (!rc && !post_ret) {
2107 if (caw && zero_dl)
c8e63985
NB		 2108 goto queue_rsp;
2109
a6b0133c 2110 return;
a2890087
NB		 2111 } else if (rc) {
2112 ret = transport_send_check_condition_and_sense(cmd,
2113 rc, 0);
2114 if (ret == -EAGAIN || ret == -ENOMEM)
2115 goto queue_full;
a6b0133c 2116
a2890087
NB		 2117 transport_lun_remove_cmd(cmd);
2118 transport_cmd_check_stop_to_fabric(cmd);
2119 return;
2120 }
a6b0133c 2121 }
c66ac9db 2122
c8e63985 2123queue_rsp:
c66ac9db
NB		 2124 switch (cmd->data_direction) {
2125 case DMA_FROM_DEVICE:
4347ab5a
NB		 2126 if (cmd->scsi_status)
2127 goto queue_status;
2128
4cc987ea
NB		 2129 atomic_long_add(cmd->data_length,
2130 &cmd->se_lun->lun_stats.tx_data_octets);
bc005869
NB		 2131 /*
2132 * Perform READ_STRIP of PI using software emulation when
2133 * backend had PI enabled, if the transport will not be
2134 * performing hardware READ_STRIP offload.
2135 */
fdeab852 2136 if (target_read_prot_action(cmd)) {
bc005869
NB		 2137 ret = transport_send_check_condition_and_sense(cmd,
2138 cmd->pi_err, 0);
2139 if (ret == -EAGAIN || ret == -ENOMEM)
2140 goto queue_full;
2141
2142 transport_lun_remove_cmd(cmd);
2143 transport_cmd_check_stop_to_fabric(cmd);
2144 return;
2145 }
c66ac9db 2146
e5c0d6ad 2147 trace_target_cmd_complete(cmd);
07bde79a 2148 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2149 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2150 goto queue_full;
c66ac9db
NB		 2151 break;
2152 case DMA_TO_DEVICE:
4cc987ea
NB		 2153 atomic_long_add(cmd->data_length,
2154 &cmd->se_lun->lun_stats.rx_data_octets);
c66ac9db
NB		 2155 /*
2156 * Check if we need to send READ payload for BIDI-COMMAND
2157 */
64577407 2158 if (cmd->se_cmd_flags & SCF_BIDI) {
4cc987ea
NB		 2159 atomic_long_add(cmd->data_length,
2160 &cmd->se_lun->lun_stats.tx_data_octets);
07bde79a 2161 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2162 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2163 goto queue_full;
c66ac9db
NB		 2164 break;
2165 }
2166 /* Fall through for DMA_TO_DEVICE */
2167 case DMA_NONE:
4347ab5a 2168queue_status:
e5c0d6ad 2169 trace_target_cmd_complete(cmd);
07bde79a 2170 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2171 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2172 goto queue_full;
c66ac9db
NB		 2173 break;
2174 default:
2175 break;
2176 }
2177
2178 transport_lun_remove_cmd(cmd);
2179 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2180 return;
2181
2182queue_full:
6708bb27 2183 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2184 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2185 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2186 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2187}
2188
e64aa657 2189void target_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2190{
ec98f782 2191 struct scatterlist *sg;
ec98f782 2192 int count;
c66ac9db 2193
6708bb27
AG		 2194 for_each_sg(sgl, sg, nents, count)
2195 __free_page(sg_page(sg));
c66ac9db 2196
6708bb27
AG		 2197 kfree(sgl);
2198}
e64aa657 2199EXPORT_SYMBOL(target_free_sgl);
c66ac9db 2200
47e459e6
NB		 2201static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2202{
2203 /*
2204 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2205 * emulation, and free + reset pointers if necessary..
2206 */
2207 if (!cmd->t_data_sg_orig)
2208 return;
2209
2210 kfree(cmd->t_data_sg);
2211 cmd->t_data_sg = cmd->t_data_sg_orig;
2212 cmd->t_data_sg_orig = NULL;
2213 cmd->t_data_nents = cmd->t_data_nents_orig;
2214 cmd->t_data_nents_orig = 0;
2215}
2216
6708bb27
AG		 2217static inline void transport_free_pages(struct se_cmd *cmd)
2218{
5835812f 2219 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
e64aa657 2220 target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
5835812f
AM		 2221 cmd->t_prot_sg = NULL;
2222 cmd->t_prot_nents = 0;
2223 }
2224
47e459e6 2225 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2226 /*
2227 * Release special case READ buffer payload required for
2228 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2229 */
2230 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
e64aa657 2231 target_free_sgl(cmd->t_bidi_data_sg,
c8e63985
NB		 2232 cmd->t_bidi_data_nents);
2233 cmd->t_bidi_data_sg = NULL;
2234 cmd->t_bidi_data_nents = 0;
2235 }
47e459e6 2236 transport_reset_sgl_orig(cmd);
6708bb27 2237 return;
47e459e6
NB		 2238 }
2239 transport_reset_sgl_orig(cmd);
6708bb27 2240
e64aa657 2241 target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2242 cmd->t_data_sg = NULL;
2243 cmd->t_data_nents = 0;
c66ac9db 2244
e64aa657 2245 target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2246 cmd->t_bidi_data_sg = NULL;
2247 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2248}
2249
e26d99ae 2250/**
febe562c
NB		 2251 * transport_put_cmd - release a reference to a command
2252 * @cmd: command to release
e26d99ae 2253 *
febe562c 2254 * This routine releases our reference to the command and frees it if possible.
e26d99ae 2255 */
febe562c 2256static int transport_put_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2257{
2258 BUG_ON(!cmd->se_tfo);
e26d99ae 2259 /*
7481deb4
NB		 2260 * If this cmd has been setup with target_get_sess_cmd(), drop
2261 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2262 */
afc16604 2263 return target_put_sess_cmd(cmd);
e26d99ae
CH		 2264}
2265
4949314c 2266void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2267{
ec98f782 2268 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2269 struct page **pages;
2270 int i;
05d1c7c0
AG		 2271
2272 /*
ec98f782
AG		 2273 * We need to take into account a possible offset here for fabrics like
2274 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2275 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2276 */
4949314c
AG		 2277 if (!cmd->t_data_nents)
2278 return NULL;
3717ef0c
PB		 2279
2280 BUG_ON(!sg);
2281 if (cmd->t_data_nents == 1)
4949314c
AG		 2282 return kmap(sg_page(sg)) + sg->offset;
2283
2284 /* >1 page. use vmap */
2285 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2286 if (!pages)
4949314c
AG		 2287 return NULL;
2288
2289 /* convert sg[] to pages[] */
2290 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2291 pages[i] = sg_page(sg);
2292 }
2293
2294 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2295 kfree(pages);
de103c93 2296 if (!cmd->t_data_vmap)
4949314c
AG		 2297 return NULL;
2298
2299 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2300}
4949314c 2301EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2302
4949314c 2303void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2304{
a1edf9cf 2305 if (!cmd->t_data_nents) {
4949314c 2306 return;
a1edf9cf 2307 } else if (cmd->t_data_nents == 1) {
4949314c 2308 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2309 return;
2310 }
4949314c
AG		 2311
2312 vunmap(cmd->t_data_vmap);
2313 cmd->t_data_vmap = NULL;
05d1c7c0 2314}
4949314c 2315EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2316
c5ff8d6b 2317int
20093994 2318target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
e64aa657 2319 bool zero_page, bool chainable)
c66ac9db 2320{
20093994 2321 struct scatterlist *sg;
ec98f782 2322 struct page *page;
20093994 2323 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
e64aa657 2324 unsigned int nalloc, nent;
ec98f782 2325 int i = 0;
c66ac9db 2326
e64aa657
CH		 2327 nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
2328 if (chainable)
2329 nalloc++;
2330 sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
20093994 2331 if (!sg)
ec98f782 2332 return -ENOMEM;
c66ac9db 2333
e64aa657 2334 sg_init_table(sg, nalloc);
9db9da33 2335
ec98f782
AG		 2336 while (length) {
2337 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2338 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2339 if (!page)
2340 goto out;
c66ac9db 2341
20093994 2342 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2343 length -= page_len;
2344 i++;
c66ac9db 2345 }
20093994
NB		 2346 *sgl = sg;
2347 *nents = nent;
c66ac9db 2348 return 0;
c66ac9db 2349
ec98f782 2350out:
d0e27c88 2351 while (i > 0) {
ec98f782 2352 i--;
20093994 2353 __free_page(sg_page(&sg[i]));
c66ac9db 2354 }
20093994 2355 kfree(sg);
ec98f782 2356 return -ENOMEM;
c66ac9db 2357}
e64aa657 2358EXPORT_SYMBOL(target_alloc_sgl);
c66ac9db 2359
da0f7619 2360/*
b16a35b0
AG		 2361 * Allocate any required resources to execute the command. For writes we
2362 * might not have the payload yet, so notify the fabric via a call to
2363 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2364 */
de103c93
CH		 2365sense_reason_t
2366transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2367{
c66ac9db 2368 int ret = 0;
c8e63985 2369 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db 2370
5835812f
AM		 2371 if (cmd->prot_op != TARGET_PROT_NORMAL &&
2372 !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
2373 ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
e64aa657 2374 cmd->prot_length, true, false);
5835812f
AM		 2375 if (ret < 0)
2376 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2377 }
2378
c66ac9db
NB		 2379 /*
2380 * Determine is the TCM fabric module has already allocated physical
2381 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2382 * beforehand.
c66ac9db 2383 */
ec98f782
AG		 2384 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2385 cmd->data_length) {
20093994 2386
8cefe07b
NB		 2387 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2388 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2389 u32 bidi_length;
2390
2391 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2392 bidi_length = cmd->t_task_nolb *
2393 cmd->se_dev->dev_attrib.block_size;
2394 else
2395 bidi_length = cmd->data_length;
2396
2397 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2398 &cmd->t_bidi_data_nents,
e64aa657 2399 bidi_length, zero_flag, false);
8cefe07b
NB		 2400 if (ret < 0)
2401 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2402 }
2403
20093994 2404 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
e64aa657 2405 cmd->data_length, zero_flag, false);
c66ac9db 2406 if (ret < 0)
de103c93 2407 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2408 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2409 cmd->data_length) {
2410 /*
2411 * Special case for COMPARE_AND_WRITE with fabrics
2412 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2413 */
2414 u32 caw_length = cmd->t_task_nolb *
2415 cmd->se_dev->dev_attrib.block_size;
2416
2417 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2418 &cmd->t_bidi_data_nents,
e64aa657 2419 caw_length, zero_flag, false);
c8e63985
NB		 2420 if (ret < 0)
2421 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2422 }
c66ac9db 2423 /*
c3196f0c
CH		 2424 * If this command is not a write we can execute it right here,
2425 * for write buffers we need to notify the fabric driver first
2426 * and let it call back once the write buffers are ready.
c66ac9db 2427 */
5f41a31d 2428 target_add_to_state_list(cmd);
885e7b0e 2429 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2430 target_execute_cmd(cmd);
2431 return 0;
2432 }
862e6389 2433 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2434
2435 ret = cmd->se_tfo->write_pending(cmd);
2436 if (ret == -EAGAIN || ret == -ENOMEM)
2437 goto queue_full;
2438
de103c93
CH		 2439 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2440 WARN_ON(ret);
2441
b69c1fcf 2442 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2443
c3196f0c
CH		 2444queue_full:
2445 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2446 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2447 transport_handle_queue_full(cmd, cmd->se_dev);
2448 return 0;
c66ac9db 2449}
a1d8b49a 2450EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2451
e057f533 2452static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2453{
f147abb4
NB		 2454 int ret;
2455
2456 ret = cmd->se_tfo->write_pending(cmd);
2457 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2458 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2459 cmd);
2460 transport_handle_queue_full(cmd, cmd->se_dev);
2461 }
07bde79a
NB		 2462}
2463
0f4a9431
NB		 2464static bool
2465__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
2466 unsigned long *flags);
2467
2468static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
2469{
2470 unsigned long flags;
2471
2472 spin_lock_irqsave(&cmd->t_state_lock, flags);
2473 __transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
2474 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2475}
2476
d5ddad41 2477int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2478{
d5ddad41 2479 int ret = 0;
0f4a9431 2480 bool aborted = false, tas = false;
d5ddad41 2481
d14921d6 2482 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2483 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
0f4a9431 2484 target_wait_free_cmd(cmd, &aborted, &tas);
d14921d6 2485
0f4a9431
NB		 2486 if (!aborted || tas)
2487 ret = transport_put_cmd(cmd);
d14921d6
NB		 2488 } else {
2489 if (wait_for_tasks)
0f4a9431 2490 target_wait_free_cmd(cmd, &aborted, &tas);
c130480b
NB		 2491 /*
2492 * Handle WRITE failure case where transport_generic_new_cmd()
2493 * has already added se_cmd to state_list, but fabric has
2494 * failed command before I/O submission.
2495 */
febe562c 2496 if (cmd->state_active)
c130480b 2497 target_remove_from_state_list(cmd);
d14921d6 2498
82f1c8a4 2499 if (cmd->se_lun)
c66ac9db 2500 transport_lun_remove_cmd(cmd);
c66ac9db 2501
0f4a9431
NB		 2502 if (!aborted || tas)
2503 ret = transport_put_cmd(cmd);
2504 }
2505 /*
2506 * If the task has been internally aborted due to TMR ABORT_TASK
2507 * or LUN_RESET, target_core_tmr.c is responsible for performing
2508 * the remaining calls to target_put_sess_cmd(), and not the
2509 * callers of this function.
2510 */
2511 if (aborted) {
2512 pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
2513 wait_for_completion(&cmd->cmd_wait_comp);
2514 cmd->se_tfo->release_cmd(cmd);
2515 ret = 1;
c66ac9db 2516 }
d5ddad41 2517 return ret;
c66ac9db
NB		 2518}
2519EXPORT_SYMBOL(transport_generic_free_cmd);
2520
a17f091d 2521/* target_get_sess_cmd - Add command to active ->sess_cmd_list
a17f091d 2522 * @se_cmd: command descriptor to add
a6360785 2523 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2524 */
afc16604 2525int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
a17f091d 2526{
afc16604 2527 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2528 unsigned long flags;
bc187ea6 2529 int ret = 0;
a17f091d 2530
a6360785
NB		 2531 /*
2532 * Add a second kref if the fabric caller is expecting to handle
2533 * fabric acknowledgement that requires two target_put_sess_cmd()
2534 * invocations before se_cmd descriptor release.
2535 */
054922bb 2536 if (ack_kref)
a6360785 2537 kref_get(&se_cmd->cmd_kref);
7481deb4 2538
a17f091d 2539 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2540 if (se_sess->sess_tearing_down) {
2541 ret = -ESHUTDOWN;
2542 goto out;
2543 }
a17f091d 2544 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2545out:
a17f091d 2546 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2547
2548 if (ret && ack_kref)
afc16604 2549 target_put_sess_cmd(se_cmd);
7544e597 2550
bc187ea6 2551 return ret;
a17f091d 2552}
20361e69 2553EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2554
febe562c
NB		 2555static void target_free_cmd_mem(struct se_cmd *cmd)
2556{
2557 transport_free_pages(cmd);
2558
2559 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2560 core_tmr_release_req(cmd->se_tmr_req);
2561 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2562 kfree(cmd->t_task_cdb);
2563}
2564
7481deb4 2565static void target_release_cmd_kref(struct kref *kref)
a17f091d 2566{
7481deb4
NB		 2567 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2568 struct se_session *se_sess = se_cmd->se_sess;
9ff9d15e 2569 unsigned long flags;
0f4a9431 2570 bool fabric_stop;
a17f091d 2571
9ff9d15e 2572 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
0f4a9431
NB		 2573
2574 spin_lock(&se_cmd->t_state_lock);
064cdd2d
NB		 2575 fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
2576 (se_cmd->transport_state & CMD_T_ABORTED);
0f4a9431
NB		 2577 spin_unlock(&se_cmd->t_state_lock);
2578
2579 if (se_cmd->cmd_wait_set || fabric_stop) {
2580 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2581 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
febe562c 2582 target_free_cmd_mem(se_cmd);
a17f091d 2583 complete(&se_cmd->cmd_wait_comp);
7481deb4 2584 return;
a17f091d 2585 }
0f4a9431 2586 list_del_init(&se_cmd->se_cmd_list);
9ff9d15e 2587 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
a17f091d 2588
febe562c 2589 target_free_cmd_mem(se_cmd);
7481deb4
NB		 2590 se_cmd->se_tfo->release_cmd(se_cmd);
2591}
2592
2593/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
7481deb4
NB		 2594 * @se_cmd: command descriptor to drop
2595 */
afc16604 2596int target_put_sess_cmd(struct se_cmd *se_cmd)
7481deb4 2597{
afc16604
BVA		 2598 struct se_session *se_sess = se_cmd->se_sess;
2599
0ed6e189 2600 if (!se_sess) {
febe562c 2601 target_free_cmd_mem(se_cmd);
0ed6e189
NB		 2602 se_cmd->se_tfo->release_cmd(se_cmd);
2603 return 1;
2604 }
9ff9d15e 2605 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
a17f091d
NB		 2606}
2607EXPORT_SYMBOL(target_put_sess_cmd);
2608
1c7b13fe
RD		 2609/* target_sess_cmd_list_set_waiting - Flag all commands in
2610 * sess_cmd_list to complete cmd_wait_comp. Set
2611 * sess_tearing_down so no more commands are queued.
2612 * @se_sess: session to flag
a17f091d 2613 */
1c7b13fe 2614void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2615{
2616 struct se_cmd *se_cmd;
2617 unsigned long flags;
0f4a9431 2618 int rc;
a17f091d 2619
a17f091d 2620 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2621 if (se_sess->sess_tearing_down) {
2622 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2623 return;
2624 }
1c7b13fe 2625 se_sess->sess_tearing_down = 1;
9b31a328 2626 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2627
0f4a9431
NB		 2628 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) {
2629 rc = kref_get_unless_zero(&se_cmd->cmd_kref);
2630 if (rc) {
2631 se_cmd->cmd_wait_set = 1;
2632 spin_lock(&se_cmd->t_state_lock);
2633 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
2634 spin_unlock(&se_cmd->t_state_lock);
2635 }
2636 }
a17f091d
NB		 2637
2638 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2639}
1c7b13fe 2640EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2641
2642/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2643 * @se_sess: session to wait for active I/O
a17f091d 2644 */
be646c2d 2645void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2646{
2647 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2648 unsigned long flags;
0f4a9431 2649 bool tas;
a17f091d
NB		 2650
2651 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2652 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2653 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2654 " %d\n", se_cmd, se_cmd->t_state,
2655 se_cmd->se_tfo->get_cmd_state(se_cmd));
2656
0f4a9431
NB		 2657 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2658 tas = (se_cmd->transport_state & CMD_T_TAS);
2659 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2660
2661 if (!target_put_sess_cmd(se_cmd)) {
2662 if (tas)
2663 target_put_sess_cmd(se_cmd);
2664 }
2665
be646c2d
JE		 2666 wait_for_completion(&se_cmd->cmd_wait_comp);
2667 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2668 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2669 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2670
2671 se_cmd->se_tfo->release_cmd(se_cmd);
2672 }
9b31a328
NB		 2673
2674 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2675 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2676 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2677
a17f091d
NB		 2678}
2679EXPORT_SYMBOL(target_wait_for_sess_cmds);
2680
b3eeea66 2681void transport_clear_lun_ref(struct se_lun *lun)
c66ac9db 2682{
5277797d 2683 percpu_ref_kill(&lun->lun_ref);
5277797d 2684 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2685}
2686
0f4a9431
NB		 2687static bool
2688__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
2689 bool *aborted, bool *tas, unsigned long *flags)
2690 __releases(&cmd->t_state_lock)
2691 __acquires(&cmd->t_state_lock)
c66ac9db 2692{
c66ac9db 2693
0f4a9431
NB		 2694 assert_spin_locked(&cmd->t_state_lock);
2695 WARN_ON_ONCE(!irqs_disabled());
2696
2697 if (fabric_stop)
2698 cmd->transport_state |= CMD_T_FABRIC_STOP;
2699
2700 if (cmd->transport_state & CMD_T_ABORTED)
2701 *aborted = true;
2702
2703 if (cmd->transport_state & CMD_T_TAS)
2704 *tas = true;
2705
c8e31f26 2706 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
0f4a9431 2707 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2708 return false;
cb4f4d3c 2709
c8e31f26 2710 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
0f4a9431 2711 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
a17f091d 2712 return false;
7d680f3b 2713
0f4a9431
NB		 2714 if (!(cmd->transport_state & CMD_T_ACTIVE))
2715 return false;
2716
2717 if (fabric_stop && *aborted)
a17f091d 2718 return false;
c66ac9db 2719
7d680f3b 2720 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2721
0f4a9431
NB		 2722 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
2723 " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
2724 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2725
0f4a9431 2726 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db 2727
a1d8b49a 2728 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2729
0f4a9431 2730 spin_lock_irqsave(&cmd->t_state_lock, *flags);
7d680f3b 2731 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2732
0f4a9431
NB		 2733 pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
2734 "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
c66ac9db 2735
0f4a9431
NB		 2736 return true;
2737}
2738
2739/**
2740 * transport_wait_for_tasks - wait for completion to occur
2741 * @cmd: command to wait
2742 *
2743 * Called from frontend fabric context to wait for storage engine
2744 * to pause and/or release frontend generated struct se_cmd.
2745 */
2746bool transport_wait_for_tasks(struct se_cmd *cmd)
2747{
2748 unsigned long flags;
2749 bool ret, aborted = false, tas = false;
2750
2751 spin_lock_irqsave(&cmd->t_state_lock, flags);
2752 ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
d14921d6 2753 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2754
0f4a9431 2755 return ret;
c66ac9db 2756}
d14921d6 2757EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db 2758
ab78fef4
BVA		 2759struct sense_info {
2760 u8 key;
2761 u8 asc;
2762 u8 ascq;
2763 bool add_sector_info;
2764};
2765
2766static const struct sense_info sense_info_table[] = {
2767 [TCM_NO_SENSE] = {
2768 .key = NOT_READY
2769 },
2770 [TCM_NON_EXISTENT_LUN] = {
2771 .key = ILLEGAL_REQUEST,
2772 .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
2773 },
2774 [TCM_UNSUPPORTED_SCSI_OPCODE] = {
2775 .key = ILLEGAL_REQUEST,
2776 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2777 },
2778 [TCM_SECTOR_COUNT_TOO_MANY] = {
2779 .key = ILLEGAL_REQUEST,
2780 .asc = 0x20, /* INVALID COMMAND OPERATION CODE */
2781 },
2782 [TCM_UNKNOWN_MODE_PAGE] = {
2783 .key = ILLEGAL_REQUEST,
2784 .asc = 0x24, /* INVALID FIELD IN CDB */
2785 },
2786 [TCM_CHECK_CONDITION_ABORT_CMD] = {
2787 .key = ABORTED_COMMAND,
2788 .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
2789 .ascq = 0x03,
2790 },
2791 [TCM_INCORRECT_AMOUNT_OF_DATA] = {
2792 .key = ABORTED_COMMAND,
2793 .asc = 0x0c, /* WRITE ERROR */
2794 .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
2795 },
2796 [TCM_INVALID_CDB_FIELD] = {
2797 .key = ILLEGAL_REQUEST,
2798 .asc = 0x24, /* INVALID FIELD IN CDB */
2799 },
2800 [TCM_INVALID_PARAMETER_LIST] = {
2801 .key = ILLEGAL_REQUEST,
2802 .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
2803 },
2804 [TCM_PARAMETER_LIST_LENGTH_ERROR] = {
2805 .key = ILLEGAL_REQUEST,
2806 .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
2807 },
2808 [TCM_UNEXPECTED_UNSOLICITED_DATA] = {
2809 .key = ILLEGAL_REQUEST,
2810 .asc = 0x0c, /* WRITE ERROR */
2811 .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
2812 },
2813 [TCM_SERVICE_CRC_ERROR] = {
2814 .key = ABORTED_COMMAND,
2815 .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
2816 .ascq = 0x05, /* N/A */
2817 },
2818 [TCM_SNACK_REJECTED] = {
2819 .key = ABORTED_COMMAND,
2820 .asc = 0x11, /* READ ERROR */
2821 .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
2822 },
2823 [TCM_WRITE_PROTECTED] = {
2824 .key = DATA_PROTECT,
2825 .asc = 0x27, /* WRITE PROTECTED */
2826 },
2827 [TCM_ADDRESS_OUT_OF_RANGE] = {
2828 .key = ILLEGAL_REQUEST,
2829 .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2830 },
2831 [TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
2832 .key = UNIT_ATTENTION,
2833 },
2834 [TCM_CHECK_CONDITION_NOT_READY] = {
2835 .key = NOT_READY,
2836 },
2837 [TCM_MISCOMPARE_VERIFY] = {
2838 .key = MISCOMPARE,
2839 .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
2840 .ascq = 0x00,
2841 },
2842 [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
734ca5c4 2843 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2844 .asc = 0x10,
2845 .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
2846 .add_sector_info = true,
2847 },
2848 [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
734ca5c4 2849 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2850 .asc = 0x10,
2851 .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2852 .add_sector_info = true,
2853 },
2854 [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
734ca5c4 2855 .key = ABORTED_COMMAND,
ab78fef4
BVA		 2856 .asc = 0x10,
2857 .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2858 .add_sector_info = true,
2859 },
2860 [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
2861 /*
2862 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2863 * Solaris initiators. Returning NOT READY instead means the
2864 * operations will be retried a finite number of times and we
2865 * can survive intermittent errors.
2866 */
2867 .key = NOT_READY,
2868 .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
2869 },
2870};
2871
f5a8b3a7 2872static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
ab78fef4
BVA		 2873{
2874 const struct sense_info *si;
2875 u8 *buffer = cmd->sense_buffer;
2876 int r = (__force int)reason;
2877 u8 asc, ascq;
4e4937e8 2878 bool desc_format = target_sense_desc_format(cmd->se_dev);
ab78fef4
BVA		 2879
2880 if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
2881 si = &sense_info_table[r];
2882 else
2883 si = &sense_info_table[(__force int)
2884 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
2885
ab78fef4
BVA		 2886 if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
2887 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2888 WARN_ON_ONCE(asc == 0);
2889 } else if (si->asc == 0) {
2890 WARN_ON_ONCE(cmd->scsi_asc == 0);
2891 asc = cmd->scsi_asc;
2892 ascq = cmd->scsi_ascq;
2893 } else {
2894 asc = si->asc;
2895 ascq = si->ascq;
2896 }
9ec1e1ce 2897
4e4937e8 2898 scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
ab78fef4 2899 if (si->add_sector_info)
f5a8b3a7
SG		 2900 return scsi_set_sense_information(buffer,
2901 cmd->scsi_sense_length,
2902 cmd->bad_sector);
2903
2904 return 0;
ab78fef4
BVA		 2905}
2906
de103c93
CH		 2907int
2908transport_send_check_condition_and_sense(struct se_cmd *cmd,
2909 sense_reason_t reason, int from_transport)
c66ac9db 2910{
c66ac9db 2911 unsigned long flags;
c66ac9db 2912
a1d8b49a 2913 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2914 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2915 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2916 return 0;
2917 }
2918 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2919 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2920
ab78fef4 2921 if (!from_transport) {
f5a8b3a7
SG		 2922 int rc;
2923
c66ac9db 2924 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
ab78fef4
BVA		 2925 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2926 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
f5a8b3a7
SG		 2927 rc = translate_sense_reason(cmd, reason);
2928 if (rc)
2929 return rc;
c66ac9db 2930 }
c66ac9db 2931
e5c0d6ad 2932 trace_target_cmd_complete(cmd);
07bde79a 2933 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2934}
2935EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2936
310d3d31
NB		 2937static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2938 __releases(&cmd->t_state_lock)
2939 __acquires(&cmd->t_state_lock)
c66ac9db 2940{
310d3d31
NB		 2941 assert_spin_locked(&cmd->t_state_lock);
2942 WARN_ON_ONCE(!irqs_disabled());
2943
c18bc7d8
RD		 2944 if (!(cmd->transport_state & CMD_T_ABORTED))
2945 return 0;
68259b5a
AL		 2946 /*
2947 * If cmd has been aborted but either no status is to be sent or it has
2948 * already been sent, just return
2949 */
310d3d31
NB		 2950 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
2951 if (send_status)
2952 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
c18bc7d8 2953 return 1;
310d3d31 2954 }
8b1e1244 2955
310d3d31
NB		 2956 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
2957 " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
8b1e1244 2958
68259b5a 2959 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2960 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2961 trace_target_cmd_complete(cmd);
310d3d31
NB		 2962
2963 spin_unlock_irq(&cmd->t_state_lock);
c18bc7d8 2964 cmd->se_tfo->queue_status(cmd);
310d3d31 2965 spin_lock_irq(&cmd->t_state_lock);
c18bc7d8
RD		 2966
2967 return 1;
c66ac9db 2968}
310d3d31
NB		 2969
2970int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2971{
2972 int ret;
2973
2974 spin_lock_irq(&cmd->t_state_lock);
2975 ret = __transport_check_aborted_status(cmd, send_status);
2976 spin_unlock_irq(&cmd->t_state_lock);
2977
2978 return ret;
2979}
c66ac9db
NB		 2980EXPORT_SYMBOL(transport_check_aborted_status);
2981
2982void transport_send_task_abort(struct se_cmd *cmd)
2983{
c252f003
NB		 2984 unsigned long flags;
2985
2986 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2987 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2988 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2989 return;
2990 }
2991 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2992
c66ac9db
NB		 2993 /*
2994 * If there are still expected incoming fabric WRITEs, we wait
2995 * until until they have completed before sending a TASK_ABORTED
2996 * response. This response with TASK_ABORTED status will be
2997 * queued back to fabric module by transport_check_aborted_status().
2998 */
2999 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 3000 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
310d3d31
NB		 3001 spin_lock_irqsave(&cmd->t_state_lock, flags);
3002 if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
3003 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3004 goto send_abort;
3005 }
68259b5a 3006 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
310d3d31 3007 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
29f4c090 3008 return;
c66ac9db
NB		 3009 }
3010 }
310d3d31 3011send_abort:
c66ac9db 3012 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3013
72b59d6e
RD		 3014 transport_lun_remove_cmd(cmd);
3015
649ee054
BVA		 3016 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
3017 cmd->t_task_cdb[0], cmd->tag);
8b1e1244 3018
e5c0d6ad 3019 trace_target_cmd_complete(cmd);
e3d6f909 3020 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3021}
3022
af877292 3023static void target_tmr_work(struct work_struct *work)
c66ac9db 3024{
af877292 3025 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3026 struct se_device *dev = cmd->se_dev;
c66ac9db 3027 struct se_tmr_req *tmr = cmd->se_tmr_req;
a6d9bb1c 3028 unsigned long flags;
c66ac9db
NB		 3029 int ret;
3030
a6d9bb1c
NB		 3031 spin_lock_irqsave(&cmd->t_state_lock, flags);
3032 if (cmd->transport_state & CMD_T_ABORTED) {
3033 tmr->response = TMR_FUNCTION_REJECTED;
3034 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3035 goto check_stop;
3036 }
3037 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3038
c66ac9db 3039 switch (tmr->function) {
5c6cd613 3040 case TMR_ABORT_TASK:
3d28934a 3041 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3042 break;
5c6cd613
NB		 3043 case TMR_ABORT_TASK_SET:
3044 case TMR_CLEAR_ACA:
3045 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3046 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3047 break;
5c6cd613 3048 case TMR_LUN_RESET:
c66ac9db
NB		 3049 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3050 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3051 TMR_FUNCTION_REJECTED;
b5aafb16
HR		 3052 if (tmr->response == TMR_FUNCTION_COMPLETE) {
3053 target_ua_allocate_lun(cmd->se_sess->se_node_acl,
3054 cmd->orig_fe_lun, 0x29,
3055 ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
3056 }
c66ac9db 3057 break;
5c6cd613 3058 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3059 tmr->response = TMR_FUNCTION_REJECTED;
3060 break;
5c6cd613 3061 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3062 tmr->response = TMR_FUNCTION_REJECTED;
3063 break;
c66ac9db 3064 default:
6708bb27 3065 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3066 tmr->function);
3067 tmr->response = TMR_FUNCTION_REJECTED;
3068 break;
3069 }
3070
a6d9bb1c
NB		 3071 spin_lock_irqsave(&cmd->t_state_lock, flags);
3072 if (cmd->transport_state & CMD_T_ABORTED) {
3073 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3074 goto check_stop;
3075 }
c66ac9db 3076 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
a6d9bb1c
NB		 3077 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3078
e3d6f909 3079 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3080
a6d9bb1c 3081check_stop:
b7b8bef7 3082 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3083}
3084
af877292
CH		 3085int transport_generic_handle_tmr(
3086 struct se_cmd *cmd)
c66ac9db 3087{
f15e9cd9
NB		 3088 unsigned long flags;
3089
3090 spin_lock_irqsave(&cmd->t_state_lock, flags);
3091 cmd->transport_state |= CMD_T_ACTIVE;
3092 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3093
af877292
CH		 3094 INIT_WORK(&cmd->work, target_tmr_work);
3095 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3096 return 0;
3097}
af877292 3098EXPORT_SYMBOL(transport_generic_handle_tmr);
814e5b45
CH		 3099
3100bool
3101target_check_wce(struct se_device *dev)
3102{
3103 bool wce = false;
3104
3105 if (dev->transport->get_write_cache)
3106 wce = dev->transport->get_write_cache(dev);
3107 else if (dev->dev_attrib.emulate_write_cache > 0)
3108 wce = true;
3109
3110 return wce;
3111}
3112
3113bool
3114target_check_fua(struct se_device *dev)
3115{
3116 return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
3117}
Linux kernel - Deliverables
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