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Btrfs: stop the readahead threads on failed mount
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / target / iscsi / iscsi_target_login.c
blobdaad362a93cecebeca5c9bcce26233da3b202df1
1 /*******************************************************************************
2 * This file contains the login functions used by the iSCSI Target driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.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
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <scsi/iscsi_proto.h>
25 #include <target/target_core_base.h>
26 #include <target/target_core_transport.h>
27
28 #include "iscsi_target_core.h"
29 #include "iscsi_target_tq.h"
30 #include "iscsi_target_device.h"
31 #include "iscsi_target_nego.h"
32 #include "iscsi_target_erl0.h"
33 #include "iscsi_target_erl2.h"
34 #include "iscsi_target_login.h"
35 #include "iscsi_target_stat.h"
36 #include "iscsi_target_tpg.h"
37 #include "iscsi_target_util.h"
38 #include "iscsi_target.h"
39 #include "iscsi_target_parameters.h"
40
41 extern struct idr sess_idr;
42 extern struct mutex auth_id_lock;
43 extern spinlock_t sess_idr_lock;
44
45 static int iscsi_login_init_conn(struct iscsi_conn *conn)
46 {
47 INIT_LIST_HEAD(&conn->conn_list);
48 INIT_LIST_HEAD(&conn->conn_cmd_list);
49 INIT_LIST_HEAD(&conn->immed_queue_list);
50 INIT_LIST_HEAD(&conn->response_queue_list);
51 init_completion(&conn->conn_post_wait_comp);
52 init_completion(&conn->conn_wait_comp);
53 init_completion(&conn->conn_wait_rcfr_comp);
54 init_completion(&conn->conn_waiting_on_uc_comp);
55 init_completion(&conn->conn_logout_comp);
56 init_completion(&conn->rx_half_close_comp);
57 init_completion(&conn->tx_half_close_comp);
58 spin_lock_init(&conn->cmd_lock);
59 spin_lock_init(&conn->conn_usage_lock);
60 spin_lock_init(&conn->immed_queue_lock);
61 spin_lock_init(&conn->nopin_timer_lock);
62 spin_lock_init(&conn->response_queue_lock);
63 spin_lock_init(&conn->state_lock);
64
65 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
66 pr_err("Unable to allocate conn->conn_cpumask\n");
67 return -ENOMEM;
68 }
69
70 return 0;
71 }
72
73 /*
74 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
75 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
76 */
77 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
78 {
79 /*
80 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
81 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
82 * to software 1x8 byte slicing from crc32c.ko
83 */
84 conn->conn_rx_hash.flags = 0;
85 conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
86 CRYPTO_ALG_ASYNC);
87 if (IS_ERR(conn->conn_rx_hash.tfm)) {
88 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
89 return -ENOMEM;
90 }
91
92 conn->conn_tx_hash.flags = 0;
93 conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
94 CRYPTO_ALG_ASYNC);
95 if (IS_ERR(conn->conn_tx_hash.tfm)) {
96 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
97 crypto_free_hash(conn->conn_rx_hash.tfm);
98 return -ENOMEM;
99 }
100
101 return 0;
102 }
103
104 static int iscsi_login_check_initiator_version(
105 struct iscsi_conn *conn,
106 u8 version_max,
107 u8 version_min)
108 {
109 if ((version_max != 0x00) || (version_min != 0x00)) {
110 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
111 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
112 version_min, version_max);
113 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
114 ISCSI_LOGIN_STATUS_NO_VERSION);
115 return -1;
116 }
117
118 return 0;
119 }
120
121 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
122 {
123 int sessiontype;
124 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
125 struct iscsi_portal_group *tpg = conn->tpg;
126 struct iscsi_session *sess = NULL, *sess_p = NULL;
127 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
128 struct se_session *se_sess, *se_sess_tmp;
129
130 initiatorname_param = iscsi_find_param_from_key(
131 INITIATORNAME, conn->param_list);
132 if (!initiatorname_param)
133 return -1;
134
135 sessiontype_param = iscsi_find_param_from_key(
136 SESSIONTYPE, conn->param_list);
137 if (!sessiontype_param)
138 return -1;
139
140 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
141
142 spin_lock_bh(&se_tpg->session_lock);
143 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
144 sess_list) {
145
146 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
147 spin_lock(&sess_p->conn_lock);
148 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
149 atomic_read(&sess_p->session_logout) ||
150 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
151 spin_unlock(&sess_p->conn_lock);
152 continue;
153 }
154 if (!memcmp((void *)sess_p->isid, (void *)conn->sess->isid, 6) &&
155 (!strcmp((void *)sess_p->sess_ops->InitiatorName,
156 (void *)initiatorname_param->value) &&
157 (sess_p->sess_ops->SessionType == sessiontype))) {
158 atomic_set(&sess_p->session_reinstatement, 1);
159 spin_unlock(&sess_p->conn_lock);
160 iscsit_inc_session_usage_count(sess_p);
161 iscsit_stop_time2retain_timer(sess_p);
162 sess = sess_p;
163 break;
164 }
165 spin_unlock(&sess_p->conn_lock);
166 }
167 spin_unlock_bh(&se_tpg->session_lock);
168 /*
169 * If the Time2Retain handler has expired, the session is already gone.
170 */
171 if (!sess)
172 return 0;
173
174 pr_debug("%s iSCSI Session SID %u is still active for %s,"
175 " preforming session reinstatement.\n", (sessiontype) ?
176 "Discovery" : "Normal", sess->sid,
177 sess->sess_ops->InitiatorName);
178
179 spin_lock_bh(&sess->conn_lock);
180 if (sess->session_state == TARG_SESS_STATE_FAILED) {
181 spin_unlock_bh(&sess->conn_lock);
182 iscsit_dec_session_usage_count(sess);
183 return iscsit_close_session(sess);
184 }
185 spin_unlock_bh(&sess->conn_lock);
186
187 iscsit_stop_session(sess, 1, 1);
188 iscsit_dec_session_usage_count(sess);
189
190 return iscsit_close_session(sess);
191 }
192
193 static void iscsi_login_set_conn_values(
194 struct iscsi_session *sess,
195 struct iscsi_conn *conn,
196 u16 cid)
197 {
198 conn->sess = sess;
199 conn->cid = cid;
200 /*
201 * Generate a random Status sequence number (statsn) for the new
202 * iSCSI connection.
203 */
204 get_random_bytes(&conn->stat_sn, sizeof(u32));
205
206 mutex_lock(&auth_id_lock);
207 conn->auth_id = iscsit_global->auth_id++;
208 mutex_unlock(&auth_id_lock);
209 }
210
211 /*
212 * This is the leading connection of a new session,
213 * or session reinstatement.
214 */
215 static int iscsi_login_zero_tsih_s1(
216 struct iscsi_conn *conn,
217 unsigned char *buf)
218 {
219 struct iscsi_session *sess = NULL;
220 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
221
222 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
223 if (!sess) {
224 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
225 ISCSI_LOGIN_STATUS_NO_RESOURCES);
226 pr_err("Could not allocate memory for session\n");
227 return -1;
228 }
229
230 iscsi_login_set_conn_values(sess, conn, pdu->cid);
231 sess->init_task_tag = pdu->itt;
232 memcpy((void *)&sess->isid, (void *)pdu->isid, 6);
233 sess->exp_cmd_sn = pdu->cmdsn;
234 INIT_LIST_HEAD(&sess->sess_conn_list);
235 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
236 INIT_LIST_HEAD(&sess->cr_active_list);
237 INIT_LIST_HEAD(&sess->cr_inactive_list);
238 init_completion(&sess->async_msg_comp);
239 init_completion(&sess->reinstatement_comp);
240 init_completion(&sess->session_wait_comp);
241 init_completion(&sess->session_waiting_on_uc_comp);
242 mutex_init(&sess->cmdsn_mutex);
243 spin_lock_init(&sess->conn_lock);
244 spin_lock_init(&sess->cr_a_lock);
245 spin_lock_init(&sess->cr_i_lock);
246 spin_lock_init(&sess->session_usage_lock);
247 spin_lock_init(&sess->ttt_lock);
248
249 if (!idr_pre_get(&sess_idr, GFP_KERNEL)) {
250 pr_err("idr_pre_get() for sess_idr failed\n");
251 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
252 ISCSI_LOGIN_STATUS_NO_RESOURCES);
253 return -1;
254 }
255 spin_lock(&sess_idr_lock);
256 idr_get_new(&sess_idr, NULL, &sess->session_index);
257 spin_unlock(&sess_idr_lock);
258
259 sess->creation_time = get_jiffies_64();
260 spin_lock_init(&sess->session_stats_lock);
261 /*
262 * The FFP CmdSN window values will be allocated from the TPG's
263 * Initiator Node's ACL once the login has been successfully completed.
264 */
265 sess->max_cmd_sn = pdu->cmdsn;
266
267 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
268 if (!sess->sess_ops) {
269 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
270 ISCSI_LOGIN_STATUS_NO_RESOURCES);
271 pr_err("Unable to allocate memory for"
272 " struct iscsi_sess_ops.\n");
273 return -1;
274 }
275
276 sess->se_sess = transport_init_session();
277 if (!sess->se_sess) {
278 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
279 ISCSI_LOGIN_STATUS_NO_RESOURCES);
280 return -1;
281 }
282
283 return 0;
284 }
285
286 static int iscsi_login_zero_tsih_s2(
287 struct iscsi_conn *conn)
288 {
289 struct iscsi_node_attrib *na;
290 struct iscsi_session *sess = conn->sess;
291 unsigned char buf[32];
292
293 sess->tpg = conn->tpg;
294
295 /*
296 * Assign a new TPG Session Handle. Note this is protected with
297 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
298 */
299 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
300 if (!sess->tsih)
301 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
302
303 /*
304 * Create the default params from user defined values..
305 */
306 if (iscsi_copy_param_list(&conn->param_list,
307 ISCSI_TPG_C(conn)->param_list, 1) < 0) {
308 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
309 ISCSI_LOGIN_STATUS_NO_RESOURCES);
310 return -1;
311 }
312
313 iscsi_set_keys_to_negotiate(0, conn->param_list);
314
315 if (sess->sess_ops->SessionType)
316 return iscsi_set_keys_irrelevant_for_discovery(
317 conn->param_list);
318
319 na = iscsit_tpg_get_node_attrib(sess);
320
321 /*
322 * Need to send TargetPortalGroupTag back in first login response
323 * on any iSCSI connection where the Initiator provides TargetName.
324 * See 5.3.1. Login Phase Start
325 *
326 * In our case, we have already located the struct iscsi_tiqn at this point.
327 */
328 memset(buf, 0, 32);
329 sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
330 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
331 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
332 ISCSI_LOGIN_STATUS_NO_RESOURCES);
333 return -1;
334 }
335
336 /*
337 * Workaround for Initiators that have broken connection recovery logic.
338 *
339 * "We would really like to get rid of this." Linux-iSCSI.org team
340 */
341 memset(buf, 0, 32);
342 sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
343 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
344 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
345 ISCSI_LOGIN_STATUS_NO_RESOURCES);
346 return -1;
347 }
348
349 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
350 return -1;
351
352 return 0;
353 }
354
355 /*
356 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
357 * The Initiator node will be able to enable FIM by proposing them itself.
358 */
359 int iscsi_login_disable_FIM_keys(
360 struct iscsi_param_list *param_list,
361 struct iscsi_conn *conn)
362 {
363 struct iscsi_param *param;
364
365 param = iscsi_find_param_from_key("OFMarker", param_list);
366 if (!param) {
367 pr_err("iscsi_find_param_from_key() for"
368 " OFMarker failed\n");
369 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
370 ISCSI_LOGIN_STATUS_NO_RESOURCES);
371 return -1;
372 }
373 param->state &= ~PSTATE_NEGOTIATE;
374
375 param = iscsi_find_param_from_key("OFMarkInt", param_list);
376 if (!param) {
377 pr_err("iscsi_find_param_from_key() for"
378 " IFMarker failed\n");
379 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
380 ISCSI_LOGIN_STATUS_NO_RESOURCES);
381 return -1;
382 }
383 param->state &= ~PSTATE_NEGOTIATE;
384
385 param = iscsi_find_param_from_key("IFMarker", param_list);
386 if (!param) {
387 pr_err("iscsi_find_param_from_key() for"
388 " IFMarker failed\n");
389 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
390 ISCSI_LOGIN_STATUS_NO_RESOURCES);
391 return -1;
392 }
393 param->state &= ~PSTATE_NEGOTIATE;
394
395 param = iscsi_find_param_from_key("IFMarkInt", param_list);
396 if (!param) {
397 pr_err("iscsi_find_param_from_key() for"
398 " IFMarker failed\n");
399 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
400 ISCSI_LOGIN_STATUS_NO_RESOURCES);
401 return -1;
402 }
403 param->state &= ~PSTATE_NEGOTIATE;
404
405 return 0;
406 }
407
408 static int iscsi_login_non_zero_tsih_s1(
409 struct iscsi_conn *conn,
410 unsigned char *buf)
411 {
412 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
413
414 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
415 return 0;
416 }
417
418 /*
419 * Add a new connection to an existing session.
420 */
421 static int iscsi_login_non_zero_tsih_s2(
422 struct iscsi_conn *conn,
423 unsigned char *buf)
424 {
425 struct iscsi_portal_group *tpg = conn->tpg;
426 struct iscsi_session *sess = NULL, *sess_p = NULL;
427 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
428 struct se_session *se_sess, *se_sess_tmp;
429 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
430
431 spin_lock_bh(&se_tpg->session_lock);
432 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
433 sess_list) {
434
435 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
436 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
437 atomic_read(&sess_p->session_logout) ||
438 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
439 continue;
440 if (!memcmp((const void *)sess_p->isid,
441 (const void *)pdu->isid, 6) &&
442 (sess_p->tsih == pdu->tsih)) {
443 iscsit_inc_session_usage_count(sess_p);
444 iscsit_stop_time2retain_timer(sess_p);
445 sess = sess_p;
446 break;
447 }
448 }
449 spin_unlock_bh(&se_tpg->session_lock);
450
451 /*
452 * If the Time2Retain handler has expired, the session is already gone.
453 */
454 if (!sess) {
455 pr_err("Initiator attempting to add a connection to"
456 " a non-existent session, rejecting iSCSI Login.\n");
457 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
458 ISCSI_LOGIN_STATUS_NO_SESSION);
459 return -1;
460 }
461
462 /*
463 * Stop the Time2Retain timer if this is a failed session, we restart
464 * the timer if the login is not successful.
465 */
466 spin_lock_bh(&sess->conn_lock);
467 if (sess->session_state == TARG_SESS_STATE_FAILED)
468 atomic_set(&sess->session_continuation, 1);
469 spin_unlock_bh(&sess->conn_lock);
470
471 iscsi_login_set_conn_values(sess, conn, pdu->cid);
472
473 if (iscsi_copy_param_list(&conn->param_list,
474 ISCSI_TPG_C(conn)->param_list, 0) < 0) {
475 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
476 ISCSI_LOGIN_STATUS_NO_RESOURCES);
477 return -1;
478 }
479
480 iscsi_set_keys_to_negotiate(0, conn->param_list);
481 /*
482 * Need to send TargetPortalGroupTag back in first login response
483 * on any iSCSI connection where the Initiator provides TargetName.
484 * See 5.3.1. Login Phase Start
485 *
486 * In our case, we have already located the struct iscsi_tiqn at this point.
487 */
488 memset(buf, 0, 32);
489 sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
490 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
491 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
492 ISCSI_LOGIN_STATUS_NO_RESOURCES);
493 return -1;
494 }
495
496 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
497 }
498
499 int iscsi_login_post_auth_non_zero_tsih(
500 struct iscsi_conn *conn,
501 u16 cid,
502 u32 exp_statsn)
503 {
504 struct iscsi_conn *conn_ptr = NULL;
505 struct iscsi_conn_recovery *cr = NULL;
506 struct iscsi_session *sess = conn->sess;
507
508 /*
509 * By following item 5 in the login table, if we have found
510 * an existing ISID and a valid/existing TSIH and an existing
511 * CID we do connection reinstatement. Currently we dont not
512 * support it so we send back an non-zero status class to the
513 * initiator and release the new connection.
514 */
515 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
516 if ((conn_ptr)) {
517 pr_err("Connection exists with CID %hu for %s,"
518 " performing connection reinstatement.\n",
519 conn_ptr->cid, sess->sess_ops->InitiatorName);
520
521 iscsit_connection_reinstatement_rcfr(conn_ptr);
522 iscsit_dec_conn_usage_count(conn_ptr);
523 }
524
525 /*
526 * Check for any connection recovery entires containing CID.
527 * We use the original ExpStatSN sent in the first login request
528 * to acknowledge commands for the failed connection.
529 *
530 * Also note that an explict logout may have already been sent,
531 * but the response may not be sent due to additional connection
532 * loss.
533 */
534 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
535 cr = iscsit_get_inactive_connection_recovery_entry(
536 sess, cid);
537 if ((cr)) {
538 pr_debug("Performing implicit logout"
539 " for connection recovery on CID: %hu\n",
540 conn->cid);
541 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
542 }
543 }
544
545 /*
546 * Else we follow item 4 from the login table in that we have
547 * found an existing ISID and a valid/existing TSIH and a new
548 * CID we go ahead and continue to add a new connection to the
549 * session.
550 */
551 pr_debug("Adding CID %hu to existing session for %s.\n",
552 cid, sess->sess_ops->InitiatorName);
553
554 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
555 pr_err("Adding additional connection to this session"
556 " would exceed MaxConnections %d, login failed.\n",
557 sess->sess_ops->MaxConnections);
558 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
559 ISCSI_LOGIN_STATUS_ISID_ERROR);
560 return -1;
561 }
562
563 return 0;
564 }
565
566 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
567 {
568 struct iscsi_session *sess = conn->sess;
569
570 if (!sess->sess_ops->SessionType)
571 iscsit_start_nopin_timer(conn);
572 }
573
574 static int iscsi_post_login_handler(
575 struct iscsi_np *np,
576 struct iscsi_conn *conn,
577 u8 zero_tsih)
578 {
579 int stop_timer = 0;
580 struct iscsi_session *sess = conn->sess;
581 struct se_session *se_sess = sess->se_sess;
582 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
583 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
584 struct iscsi_thread_set *ts;
585
586 iscsit_inc_conn_usage_count(conn);
587
588 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
589 ISCSI_LOGIN_STATUS_ACCEPT);
590
591 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
592 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
593
594 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
595 iscsit_set_sync_and_steering_values(conn);
596 /*
597 * SCSI Initiator -> SCSI Target Port Mapping
598 */
599 ts = iscsi_get_thread_set();
600 if (!zero_tsih) {
601 iscsi_set_session_parameters(sess->sess_ops,
602 conn->param_list, 0);
603 iscsi_release_param_list(conn->param_list);
604 conn->param_list = NULL;
605
606 spin_lock_bh(&sess->conn_lock);
607 atomic_set(&sess->session_continuation, 0);
608 if (sess->session_state == TARG_SESS_STATE_FAILED) {
609 pr_debug("Moving to"
610 " TARG_SESS_STATE_LOGGED_IN.\n");
611 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
612 stop_timer = 1;
613 }
614
615 pr_debug("iSCSI Login successful on CID: %hu from %s to"
616 " %s:%hu,%hu\n", conn->cid, conn->login_ip, np->np_ip,
617 np->np_port, tpg->tpgt);
618
619 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
620 atomic_inc(&sess->nconn);
621 pr_debug("Incremented iSCSI Connection count to %hu"
622 " from node: %s\n", atomic_read(&sess->nconn),
623 sess->sess_ops->InitiatorName);
624 spin_unlock_bh(&sess->conn_lock);
625
626 iscsi_post_login_start_timers(conn);
627 iscsi_activate_thread_set(conn, ts);
628 /*
629 * Determine CPU mask to ensure connection's RX and TX kthreads
630 * are scheduled on the same CPU.
631 */
632 iscsit_thread_get_cpumask(conn);
633 conn->conn_rx_reset_cpumask = 1;
634 conn->conn_tx_reset_cpumask = 1;
635
636 iscsit_dec_conn_usage_count(conn);
637 if (stop_timer) {
638 spin_lock_bh(&se_tpg->session_lock);
639 iscsit_stop_time2retain_timer(sess);
640 spin_unlock_bh(&se_tpg->session_lock);
641 }
642 iscsit_dec_session_usage_count(sess);
643 return 0;
644 }
645
646 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
647 iscsi_release_param_list(conn->param_list);
648 conn->param_list = NULL;
649
650 iscsit_determine_maxcmdsn(sess);
651
652 spin_lock_bh(&se_tpg->session_lock);
653 __transport_register_session(&sess->tpg->tpg_se_tpg,
654 se_sess->se_node_acl, se_sess, (void *)sess);
655 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
656 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
657
658 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
659 conn->cid, conn->login_ip, np->np_ip, np->np_port, tpg->tpgt);
660
661 spin_lock_bh(&sess->conn_lock);
662 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
663 atomic_inc(&sess->nconn);
664 pr_debug("Incremented iSCSI Connection count to %hu from node:"
665 " %s\n", atomic_read(&sess->nconn),
666 sess->sess_ops->InitiatorName);
667 spin_unlock_bh(&sess->conn_lock);
668
669 sess->sid = tpg->sid++;
670 if (!sess->sid)
671 sess->sid = tpg->sid++;
672 pr_debug("Established iSCSI session from node: %s\n",
673 sess->sess_ops->InitiatorName);
674
675 tpg->nsessions++;
676 if (tpg->tpg_tiqn)
677 tpg->tpg_tiqn->tiqn_nsessions++;
678
679 pr_debug("Incremented number of active iSCSI sessions to %u on"
680 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
681 spin_unlock_bh(&se_tpg->session_lock);
682
683 iscsi_post_login_start_timers(conn);
684 iscsi_activate_thread_set(conn, ts);
685 /*
686 * Determine CPU mask to ensure connection's RX and TX kthreads
687 * are scheduled on the same CPU.
688 */
689 iscsit_thread_get_cpumask(conn);
690 conn->conn_rx_reset_cpumask = 1;
691 conn->conn_tx_reset_cpumask = 1;
692
693 iscsit_dec_conn_usage_count(conn);
694
695 return 0;
696 }
697
698 static void iscsi_handle_login_thread_timeout(unsigned long data)
699 {
700 struct iscsi_np *np = (struct iscsi_np *) data;
701
702 spin_lock_bh(&np->np_thread_lock);
703 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
704 np->np_ip, np->np_port);
705
706 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
707 spin_unlock_bh(&np->np_thread_lock);
708 return;
709 }
710
711 if (np->np_thread)
712 send_sig(SIGINT, np->np_thread, 1);
713
714 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
715 spin_unlock_bh(&np->np_thread_lock);
716 }
717
718 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
719 {
720 /*
721 * This used the TA_LOGIN_TIMEOUT constant because at this
722 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
723 */
724 spin_lock_bh(&np->np_thread_lock);
725 init_timer(&np->np_login_timer);
726 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
727 np->np_login_timer.data = (unsigned long)np;
728 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
729 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
730 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
731 add_timer(&np->np_login_timer);
732
733 pr_debug("Added timeout timer to iSCSI login request for"
734 " %u seconds.\n", TA_LOGIN_TIMEOUT);
735 spin_unlock_bh(&np->np_thread_lock);
736 }
737
738 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
739 {
740 spin_lock_bh(&np->np_thread_lock);
741 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
742 spin_unlock_bh(&np->np_thread_lock);
743 return;
744 }
745 np->np_login_timer_flags |= ISCSI_TF_STOP;
746 spin_unlock_bh(&np->np_thread_lock);
747
748 del_timer_sync(&np->np_login_timer);
749
750 spin_lock_bh(&np->np_thread_lock);
751 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
752 spin_unlock_bh(&np->np_thread_lock);
753 }
754
755 int iscsi_target_setup_login_socket(
756 struct iscsi_np *np,
757 struct __kernel_sockaddr_storage *sockaddr)
758 {
759 struct socket *sock;
760 int backlog = 5, ret, opt = 0, len;
761
762 switch (np->np_network_transport) {
763 case ISCSI_TCP:
764 np->np_ip_proto = IPPROTO_TCP;
765 np->np_sock_type = SOCK_STREAM;
766 break;
767 case ISCSI_SCTP_TCP:
768 np->np_ip_proto = IPPROTO_SCTP;
769 np->np_sock_type = SOCK_STREAM;
770 break;
771 case ISCSI_SCTP_UDP:
772 np->np_ip_proto = IPPROTO_SCTP;
773 np->np_sock_type = SOCK_SEQPACKET;
774 break;
775 case ISCSI_IWARP_TCP:
776 case ISCSI_IWARP_SCTP:
777 case ISCSI_INFINIBAND:
778 default:
779 pr_err("Unsupported network_transport: %d\n",
780 np->np_network_transport);
781 return -EINVAL;
782 }
783
784 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
785 np->np_ip_proto, &sock);
786 if (ret < 0) {
787 pr_err("sock_create() failed.\n");
788 return ret;
789 }
790 np->np_socket = sock;
791 /*
792 * The SCTP stack needs struct socket->file.
793 */
794 if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
795 (np->np_network_transport == ISCSI_SCTP_UDP)) {
796 if (!sock->file) {
797 sock->file = kzalloc(sizeof(struct file), GFP_KERNEL);
798 if (!sock->file) {
799 pr_err("Unable to allocate struct"
800 " file for SCTP\n");
801 ret = -ENOMEM;
802 goto fail;
803 }
804 np->np_flags |= NPF_SCTP_STRUCT_FILE;
805 }
806 }
807 /*
808 * Setup the np->np_sockaddr from the passed sockaddr setup
809 * in iscsi_target_configfs.c code..
810 */
811 memcpy((void *)&np->np_sockaddr, (void *)sockaddr,
812 sizeof(struct __kernel_sockaddr_storage));
813
814 if (sockaddr->ss_family == AF_INET6)
815 len = sizeof(struct sockaddr_in6);
816 else
817 len = sizeof(struct sockaddr_in);
818 /*
819 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
820 */
821 opt = 1;
822 if (np->np_network_transport == ISCSI_TCP) {
823 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
824 (char *)&opt, sizeof(opt));
825 if (ret < 0) {
826 pr_err("kernel_setsockopt() for TCP_NODELAY"
827 " failed: %d\n", ret);
828 goto fail;
829 }
830 }
831
832 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
833 (char *)&opt, sizeof(opt));
834 if (ret < 0) {
835 pr_err("kernel_setsockopt() for SO_REUSEADDR"
836 " failed\n");
837 goto fail;
838 }
839
840 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
841 if (ret < 0) {
842 pr_err("kernel_bind() failed: %d\n", ret);
843 goto fail;
844 }
845
846 ret = kernel_listen(sock, backlog);
847 if (ret != 0) {
848 pr_err("kernel_listen() failed: %d\n", ret);
849 goto fail;
850 }
851
852 return 0;
853
854 fail:
855 np->np_socket = NULL;
856 if (sock) {
857 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
858 kfree(sock->file);
859 sock->file = NULL;
860 }
861
862 sock_release(sock);
863 }
864 return ret;
865 }
866
867 static int __iscsi_target_login_thread(struct iscsi_np *np)
868 {
869 u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
870 int err, ret = 0, ip_proto, sock_type, set_sctp_conn_flag, stop;
871 struct iscsi_conn *conn = NULL;
872 struct iscsi_login *login;
873 struct iscsi_portal_group *tpg = NULL;
874 struct socket *new_sock, *sock;
875 struct kvec iov;
876 struct iscsi_login_req *pdu;
877 struct sockaddr_in sock_in;
878 struct sockaddr_in6 sock_in6;
879
880 flush_signals(current);
881 set_sctp_conn_flag = 0;
882 sock = np->np_socket;
883 ip_proto = np->np_ip_proto;
884 sock_type = np->np_sock_type;
885
886 spin_lock_bh(&np->np_thread_lock);
887 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
888 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
889 complete(&np->np_restart_comp);
890 } else {
891 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
892 }
893 spin_unlock_bh(&np->np_thread_lock);
894
895 if (kernel_accept(sock, &new_sock, 0) < 0) {
896 spin_lock_bh(&np->np_thread_lock);
897 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
898 spin_unlock_bh(&np->np_thread_lock);
899 complete(&np->np_restart_comp);
900 /* Get another socket */
901 return 1;
902 }
903 spin_unlock_bh(&np->np_thread_lock);
904 goto out;
905 }
906 /*
907 * The SCTP stack needs struct socket->file.
908 */
909 if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
910 (np->np_network_transport == ISCSI_SCTP_UDP)) {
911 if (!new_sock->file) {
912 new_sock->file = kzalloc(
913 sizeof(struct file), GFP_KERNEL);
914 if (!new_sock->file) {
915 pr_err("Unable to allocate struct"
916 " file for SCTP\n");
917 sock_release(new_sock);
918 /* Get another socket */
919 return 1;
920 }
921 set_sctp_conn_flag = 1;
922 }
923 }
924
925 iscsi_start_login_thread_timer(np);
926
927 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
928 if (!conn) {
929 pr_err("Could not allocate memory for"
930 " new connection\n");
931 if (set_sctp_conn_flag) {
932 kfree(new_sock->file);
933 new_sock->file = NULL;
934 }
935 sock_release(new_sock);
936 /* Get another socket */
937 return 1;
938 }
939
940 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
941 conn->conn_state = TARG_CONN_STATE_FREE;
942 conn->sock = new_sock;
943
944 if (set_sctp_conn_flag)
945 conn->conn_flags |= CONNFLAG_SCTP_STRUCT_FILE;
946
947 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
948 conn->conn_state = TARG_CONN_STATE_XPT_UP;
949
950 /*
951 * Allocate conn->conn_ops early as a failure calling
952 * iscsit_tx_login_rsp() below will call tx_data().
953 */
954 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
955 if (!conn->conn_ops) {
956 pr_err("Unable to allocate memory for"
957 " struct iscsi_conn_ops.\n");
958 goto new_sess_out;
959 }
960 /*
961 * Perform the remaining iSCSI connection initialization items..
962 */
963 if (iscsi_login_init_conn(conn) < 0)
964 goto new_sess_out;
965
966 memset(buffer, 0, ISCSI_HDR_LEN);
967 memset(&iov, 0, sizeof(struct kvec));
968 iov.iov_base = buffer;
969 iov.iov_len = ISCSI_HDR_LEN;
970
971 if (rx_data(conn, &iov, 1, ISCSI_HDR_LEN) <= 0) {
972 pr_err("rx_data() returned an error.\n");
973 goto new_sess_out;
974 }
975
976 iscsi_opcode = (buffer[0] & ISCSI_OPCODE_MASK);
977 if (!(iscsi_opcode & ISCSI_OP_LOGIN)) {
978 pr_err("First opcode is not login request,"
979 " failing login request.\n");
980 goto new_sess_out;
981 }
982
983 pdu = (struct iscsi_login_req *) buffer;
984 pdu->cid = be16_to_cpu(pdu->cid);
985 pdu->tsih = be16_to_cpu(pdu->tsih);
986 pdu->itt = be32_to_cpu(pdu->itt);
987 pdu->cmdsn = be32_to_cpu(pdu->cmdsn);
988 pdu->exp_statsn = be32_to_cpu(pdu->exp_statsn);
989 /*
990 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
991 * when Status-Class != 0.
992 */
993 conn->login_itt = pdu->itt;
994
995 spin_lock_bh(&np->np_thread_lock);
996 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
997 spin_unlock_bh(&np->np_thread_lock);
998 pr_err("iSCSI Network Portal on %s:%hu currently not"
999 " active.\n", np->np_ip, np->np_port);
1000 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1001 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1002 goto new_sess_out;
1003 }
1004 spin_unlock_bh(&np->np_thread_lock);
1005
1006 if (np->np_sockaddr.ss_family == AF_INET6) {
1007 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1008
1009 if (conn->sock->ops->getname(conn->sock,
1010 (struct sockaddr *)&sock_in6, &err, 1) < 0) {
1011 pr_err("sock_ops->getname() failed.\n");
1012 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1013 ISCSI_LOGIN_STATUS_TARGET_ERROR);
1014 goto new_sess_out;
1015 }
1016 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
1017 &sock_in6.sin6_addr.in6_u);
1018 conn->login_port = ntohs(sock_in6.sin6_port);
1019 } else {
1020 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1021
1022 if (conn->sock->ops->getname(conn->sock,
1023 (struct sockaddr *)&sock_in, &err, 1) < 0) {
1024 pr_err("sock_ops->getname() failed.\n");
1025 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1026 ISCSI_LOGIN_STATUS_TARGET_ERROR);
1027 goto new_sess_out;
1028 }
1029 sprintf(conn->login_ip, "%pI4", &sock_in.sin_addr.s_addr);
1030 conn->login_port = ntohs(sock_in.sin_port);
1031 }
1032
1033 conn->network_transport = np->np_network_transport;
1034
1035 pr_debug("Received iSCSI login request from %s on %s Network"
1036 " Portal %s:%hu\n", conn->login_ip,
1037 (conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP",
1038 np->np_ip, np->np_port);
1039
1040 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1041 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1042
1043 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1044 pdu->min_version) < 0)
1045 goto new_sess_out;
1046
1047 zero_tsih = (pdu->tsih == 0x0000);
1048 if ((zero_tsih)) {
1049 /*
1050 * This is the leading connection of a new session.
1051 * We wait until after authentication to check for
1052 * session reinstatement.
1053 */
1054 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1055 goto new_sess_out;
1056 } else {
1057 /*
1058 * Add a new connection to an existing session.
1059 * We check for a non-existant session in
1060 * iscsi_login_non_zero_tsih_s2() below based
1061 * on ISID/TSIH, but wait until after authentication
1062 * to check for connection reinstatement, etc.
1063 */
1064 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1065 goto new_sess_out;
1066 }
1067
1068 /*
1069 * This will process the first login request, and call
1070 * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
1071 */
1072 login = iscsi_target_init_negotiation(np, conn, buffer);
1073 if (!login) {
1074 tpg = conn->tpg;
1075 goto new_sess_out;
1076 }
1077
1078 tpg = conn->tpg;
1079 if (!tpg) {
1080 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1081 goto new_sess_out;
1082 }
1083
1084 if (zero_tsih) {
1085 if (iscsi_login_zero_tsih_s2(conn) < 0) {
1086 iscsi_target_nego_release(login, conn);
1087 goto new_sess_out;
1088 }
1089 } else {
1090 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) {
1091 iscsi_target_nego_release(login, conn);
1092 goto old_sess_out;
1093 }
1094 }
1095
1096 if (iscsi_target_start_negotiation(login, conn) < 0)
1097 goto new_sess_out;
1098
1099 if (!conn->sess) {
1100 pr_err("struct iscsi_conn session pointer is NULL!\n");
1101 goto new_sess_out;
1102 }
1103
1104 iscsi_stop_login_thread_timer(np);
1105
1106 if (signal_pending(current))
1107 goto new_sess_out;
1108
1109 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1110
1111 if (ret < 0)
1112 goto new_sess_out;
1113
1114 iscsit_deaccess_np(np, tpg);
1115 tpg = NULL;
1116 /* Get another socket */
1117 return 1;
1118
1119 new_sess_out:
1120 pr_err("iSCSI Login negotiation failed.\n");
1121 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1122 ISCSI_LOGIN_STATUS_INIT_ERR);
1123 if (!zero_tsih || !conn->sess)
1124 goto old_sess_out;
1125 if (conn->sess->se_sess)
1126 transport_free_session(conn->sess->se_sess);
1127 if (conn->sess->session_index != 0) {
1128 spin_lock_bh(&sess_idr_lock);
1129 idr_remove(&sess_idr, conn->sess->session_index);
1130 spin_unlock_bh(&sess_idr_lock);
1131 }
1132 if (conn->sess->sess_ops)
1133 kfree(conn->sess->sess_ops);
1134 if (conn->sess)
1135 kfree(conn->sess);
1136 old_sess_out:
1137 iscsi_stop_login_thread_timer(np);
1138 /*
1139 * If login negotiation fails check if the Time2Retain timer
1140 * needs to be restarted.
1141 */
1142 if (!zero_tsih && conn->sess) {
1143 spin_lock_bh(&conn->sess->conn_lock);
1144 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1145 struct se_portal_group *se_tpg =
1146 &ISCSI_TPG_C(conn)->tpg_se_tpg;
1147
1148 atomic_set(&conn->sess->session_continuation, 0);
1149 spin_unlock_bh(&conn->sess->conn_lock);
1150 spin_lock_bh(&se_tpg->session_lock);
1151 iscsit_start_time2retain_handler(conn->sess);
1152 spin_unlock_bh(&se_tpg->session_lock);
1153 } else
1154 spin_unlock_bh(&conn->sess->conn_lock);
1155 iscsit_dec_session_usage_count(conn->sess);
1156 }
1157
1158 if (!IS_ERR(conn->conn_rx_hash.tfm))
1159 crypto_free_hash(conn->conn_rx_hash.tfm);
1160 if (!IS_ERR(conn->conn_tx_hash.tfm))
1161 crypto_free_hash(conn->conn_tx_hash.tfm);
1162
1163 if (conn->conn_cpumask)
1164 free_cpumask_var(conn->conn_cpumask);
1165
1166 kfree(conn->conn_ops);
1167
1168 if (conn->param_list) {
1169 iscsi_release_param_list(conn->param_list);
1170 conn->param_list = NULL;
1171 }
1172 if (conn->sock) {
1173 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
1174 kfree(conn->sock->file);
1175 conn->sock->file = NULL;
1176 }
1177 sock_release(conn->sock);
1178 }
1179 kfree(conn);
1180
1181 if (tpg) {
1182 iscsit_deaccess_np(np, tpg);
1183 tpg = NULL;
1184 }
1185
1186 out:
1187 stop = kthread_should_stop();
1188 if (!stop && signal_pending(current)) {
1189 spin_lock_bh(&np->np_thread_lock);
1190 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1191 spin_unlock_bh(&np->np_thread_lock);
1192 }
1193 /* Wait for another socket.. */
1194 if (!stop)
1195 return 1;
1196
1197 iscsi_stop_login_thread_timer(np);
1198 spin_lock_bh(&np->np_thread_lock);
1199 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1200 spin_unlock_bh(&np->np_thread_lock);
1201 return 0;
1202 }
1203
1204 int iscsi_target_login_thread(void *arg)
1205 {
1206 struct iscsi_np *np = (struct iscsi_np *)arg;
1207 int ret;
1208
1209 allow_signal(SIGINT);
1210
1211 while (!kthread_should_stop()) {
1212 ret = __iscsi_target_login_thread(np);
1213 /*
1214 * We break and exit here unless another sock_accept() call
1215 * is expected.
1216 */
1217 if (ret != 1)
1218 break;
1219 }
1220
1221 return 0;
1222 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree