1/******************************************************************************* 2 * This file contains error recovery level one used by the iSCSI Target driver. 3 * 4 * (c) Copyright 2007-2013 Datera, Inc. 5 * 6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 ******************************************************************************/ 18 19#include <linux/list.h> 20#include <scsi/iscsi_proto.h> 21#include <target/target_core_base.h> 22#include <target/target_core_fabric.h> 23#include <target/iscsi/iscsi_transport.h> 24 25#include <target/iscsi/iscsi_target_core.h> 26#include "iscsi_target_seq_pdu_list.h" 27#include "iscsi_target_datain_values.h" 28#include "iscsi_target_device.h" 29#include "iscsi_target_tpg.h" 30#include "iscsi_target_util.h" 31#include "iscsi_target_erl0.h" 32#include "iscsi_target_erl1.h" 33#include "iscsi_target_erl2.h" 34#include "iscsi_target.h" 35 36#define OFFLOAD_BUF_SIZE 32768 37 38/* 39 * Used to dump excess datain payload for certain error recovery 40 * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data(). 41 * 42 * dump_padding_digest denotes if padding and data digests need 43 * to be dumped. 44 */ 45int iscsit_dump_data_payload( 46 struct iscsi_conn *conn, 47 u32 buf_len, 48 int dump_padding_digest) 49{ 50 char *buf, pad_bytes[4]; 51 int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got; 52 u32 length, padding, offset = 0, size; 53 struct kvec iov; 54 55 if (conn->sess->sess_ops->RDMAExtensions) 56 return 0; 57 58 length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len; 59 60 buf = kzalloc(length, GFP_ATOMIC); 61 if (!buf) { 62 pr_err("Unable to allocate %u bytes for offload" 63 " buffer.\n", length); 64 return -1; 65 } 66 memset(&iov, 0, sizeof(struct kvec)); 67 68 while (offset < buf_len) { 69 size = ((offset + length) > buf_len) ? 70 (buf_len - offset) : length; 71 72 iov.iov_len = size; 73 iov.iov_base = buf; 74 75 rx_got = rx_data(conn, &iov, 1, size); 76 if (rx_got != size) { 77 ret = DATAOUT_CANNOT_RECOVER; 78 goto out; 79 } 80 81 offset += size; 82 } 83 84 if (!dump_padding_digest) 85 goto out; 86 87 padding = ((-buf_len) & 3); 88 if (padding != 0) { 89 iov.iov_len = padding; 90 iov.iov_base = pad_bytes; 91 92 rx_got = rx_data(conn, &iov, 1, padding); 93 if (rx_got != padding) { 94 ret = DATAOUT_CANNOT_RECOVER; 95 goto out; 96 } 97 } 98 99 if (conn->conn_ops->DataDigest) { 100 u32 data_crc; 101 102 iov.iov_len = ISCSI_CRC_LEN; 103 iov.iov_base = &data_crc; 104 105 rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 106 if (rx_got != ISCSI_CRC_LEN) { 107 ret = DATAOUT_CANNOT_RECOVER; 108 goto out; 109 } 110 } 111 112out: 113 kfree(buf); 114 return ret; 115} 116 117/* 118 * Used for retransmitting R2Ts from a R2T SNACK request. 119 */ 120static int iscsit_send_recovery_r2t_for_snack( 121 struct iscsi_cmd *cmd, 122 struct iscsi_r2t *r2t) 123{ 124 /* 125 * If the struct iscsi_r2t has not been sent yet, we can safely 126 * ignore retransmission 127 * of the R2TSN in question. 128 */ 129 spin_lock_bh(&cmd->r2t_lock); 130 if (!r2t->sent_r2t) { 131 spin_unlock_bh(&cmd->r2t_lock); 132 return 0; 133 } 134 r2t->sent_r2t = 0; 135 spin_unlock_bh(&cmd->r2t_lock); 136 137 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 138 139 return 0; 140} 141 142static int iscsit_handle_r2t_snack( 143 struct iscsi_cmd *cmd, 144 unsigned char *buf, 145 u32 begrun, 146 u32 runlength) 147{ 148 u32 last_r2tsn; 149 struct iscsi_r2t *r2t; 150 151 /* 152 * Make sure the initiator is not requesting retransmission 153 * of R2TSNs already acknowledged by a TMR TASK_REASSIGN. 154 */ 155 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 156 (begrun <= cmd->acked_data_sn)) { 157 pr_err("ITT: 0x%08x, R2T SNACK requesting" 158 " retransmission of R2TSN: 0x%08x to 0x%08x but already" 159 " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN," 160 " protocol error.\n", cmd->init_task_tag, begrun, 161 (begrun + runlength), cmd->acked_data_sn); 162 163 return iscsit_reject_cmd(cmd, 164 ISCSI_REASON_PROTOCOL_ERROR, buf); 165 } 166 167 if (runlength) { 168 if ((begrun + runlength) > cmd->r2t_sn) { 169 pr_err("Command ITT: 0x%08x received R2T SNACK" 170 " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds" 171 " current R2TSN: 0x%08x, protocol error.\n", 172 cmd->init_task_tag, begrun, runlength, cmd->r2t_sn); 173 return iscsit_reject_cmd(cmd, 174 ISCSI_REASON_BOOKMARK_INVALID, buf); 175 } 176 last_r2tsn = (begrun + runlength); 177 } else 178 last_r2tsn = cmd->r2t_sn; 179 180 while (begrun < last_r2tsn) { 181 r2t = iscsit_get_holder_for_r2tsn(cmd, begrun); 182 if (!r2t) 183 return -1; 184 if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0) 185 return -1; 186 187 begrun++; 188 } 189 190 return 0; 191} 192 193/* 194 * Generates Offsets and NextBurstLength based on Begrun and Runlength 195 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 196 * 197 * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only. 198 * 199 * FIXME: How is this handled for a RData SNACK? 200 */ 201int iscsit_create_recovery_datain_values_datasequenceinorder_yes( 202 struct iscsi_cmd *cmd, 203 struct iscsi_datain_req *dr) 204{ 205 u32 data_sn = 0, data_sn_count = 0; 206 u32 pdu_start = 0, seq_no = 0; 207 u32 begrun = dr->begrun; 208 struct iscsi_conn *conn = cmd->conn; 209 210 while (begrun > data_sn++) { 211 data_sn_count++; 212 if ((dr->next_burst_len + 213 conn->conn_ops->MaxRecvDataSegmentLength) < 214 conn->sess->sess_ops->MaxBurstLength) { 215 dr->read_data_done += 216 conn->conn_ops->MaxRecvDataSegmentLength; 217 dr->next_burst_len += 218 conn->conn_ops->MaxRecvDataSegmentLength; 219 } else { 220 dr->read_data_done += 221 (conn->sess->sess_ops->MaxBurstLength - 222 dr->next_burst_len); 223 dr->next_burst_len = 0; 224 pdu_start += data_sn_count; 225 data_sn_count = 0; 226 seq_no++; 227 } 228 } 229 230 if (!conn->sess->sess_ops->DataPDUInOrder) { 231 cmd->seq_no = seq_no; 232 cmd->pdu_start = pdu_start; 233 cmd->pdu_send_order = data_sn_count; 234 } 235 236 return 0; 237} 238 239/* 240 * Generates Offsets and NextBurstLength based on Begrun and Runlength 241 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 242 * 243 * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only. 244 * 245 * FIXME: How is this handled for a RData SNACK? 246 */ 247int iscsit_create_recovery_datain_values_datasequenceinorder_no( 248 struct iscsi_cmd *cmd, 249 struct iscsi_datain_req *dr) 250{ 251 int found_seq = 0, i; 252 u32 data_sn, read_data_done = 0, seq_send_order = 0; 253 u32 begrun = dr->begrun; 254 u32 runlength = dr->runlength; 255 struct iscsi_conn *conn = cmd->conn; 256 struct iscsi_seq *first_seq = NULL, *seq = NULL; 257 258 if (!cmd->seq_list) { 259 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 260 return -1; 261 } 262 263 /* 264 * Calculate read_data_done for all sequences containing a 265 * first_datasn and last_datasn less than the BegRun. 266 * 267 * Locate the struct iscsi_seq the BegRun lies within and calculate 268 * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength. 269 * 270 * Also use struct iscsi_seq->seq_send_order to determine where to start. 271 */ 272 for (i = 0; i < cmd->seq_count; i++) { 273 seq = &cmd->seq_list[i]; 274 275 if (!seq->seq_send_order) 276 first_seq = seq; 277 278 /* 279 * No data has been transferred for this DataIN sequence, so the 280 * seq->first_datasn and seq->last_datasn have not been set. 281 */ 282 if (!seq->sent) { 283 pr_err("Ignoring non-sent sequence 0x%08x ->" 284 " 0x%08x\n\n", seq->first_datasn, 285 seq->last_datasn); 286 continue; 287 } 288 289 /* 290 * This DataIN sequence is precedes the received BegRun, add the 291 * total xfer_len of the sequence to read_data_done and reset 292 * seq->pdu_send_order. 293 */ 294 if ((seq->first_datasn < begrun) && 295 (seq->last_datasn < begrun)) { 296 pr_err("Pre BegRun sequence 0x%08x ->" 297 " 0x%08x\n", seq->first_datasn, 298 seq->last_datasn); 299 300 read_data_done += cmd->seq_list[i].xfer_len; 301 seq->next_burst_len = seq->pdu_send_order = 0; 302 continue; 303 } 304 305 /* 306 * The BegRun lies within this DataIN sequence. 307 */ 308 if ((seq->first_datasn <= begrun) && 309 (seq->last_datasn >= begrun)) { 310 pr_err("Found sequence begrun: 0x%08x in" 311 " 0x%08x -> 0x%08x\n", begrun, 312 seq->first_datasn, seq->last_datasn); 313 314 seq_send_order = seq->seq_send_order; 315 data_sn = seq->first_datasn; 316 seq->next_burst_len = seq->pdu_send_order = 0; 317 found_seq = 1; 318 319 /* 320 * For DataPDUInOrder=Yes, while the first DataSN of 321 * the sequence is less than the received BegRun, add 322 * the MaxRecvDataSegmentLength to read_data_done and 323 * to the sequence's next_burst_len; 324 * 325 * For DataPDUInOrder=No, while the first DataSN of the 326 * sequence is less than the received BegRun, find the 327 * struct iscsi_pdu of the DataSN in question and add the 328 * MaxRecvDataSegmentLength to read_data_done and to the 329 * sequence's next_burst_len; 330 */ 331 if (conn->sess->sess_ops->DataPDUInOrder) { 332 while (data_sn < begrun) { 333 seq->pdu_send_order++; 334 read_data_done += 335 conn->conn_ops->MaxRecvDataSegmentLength; 336 seq->next_burst_len += 337 conn->conn_ops->MaxRecvDataSegmentLength; 338 data_sn++; 339 } 340 } else { 341 int j; 342 struct iscsi_pdu *pdu; 343 344 while (data_sn < begrun) { 345 seq->pdu_send_order++; 346 347 for (j = 0; j < seq->pdu_count; j++) { 348 pdu = &cmd->pdu_list[ 349 seq->pdu_start + j]; 350 if (pdu->data_sn == data_sn) { 351 read_data_done += 352 pdu->length; 353 seq->next_burst_len += 354 pdu->length; 355 } 356 } 357 data_sn++; 358 } 359 } 360 continue; 361 } 362 363 /* 364 * This DataIN sequence is larger than the received BegRun, 365 * reset seq->pdu_send_order and continue. 366 */ 367 if ((seq->first_datasn > begrun) || 368 (seq->last_datasn > begrun)) { 369 pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n", 370 seq->first_datasn, seq->last_datasn); 371 372 seq->next_burst_len = seq->pdu_send_order = 0; 373 continue; 374 } 375 } 376 377 if (!found_seq) { 378 if (!begrun) { 379 if (!first_seq) { 380 pr_err("ITT: 0x%08x, Begrun: 0x%08x" 381 " but first_seq is NULL\n", 382 cmd->init_task_tag, begrun); 383 return -1; 384 } 385 seq_send_order = first_seq->seq_send_order; 386 seq->next_burst_len = seq->pdu_send_order = 0; 387 goto done; 388 } 389 390 pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x," 391 " BegRun: 0x%08x, RunLength: 0x%08x while" 392 " DataSequenceInOrder=No and DataPDUInOrder=%s.\n", 393 cmd->init_task_tag, begrun, runlength, 394 (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No"); 395 return -1; 396 } 397 398done: 399 dr->read_data_done = read_data_done; 400 dr->seq_send_order = seq_send_order; 401 402 return 0; 403} 404 405static int iscsit_handle_recovery_datain( 406 struct iscsi_cmd *cmd, 407 unsigned char *buf, 408 u32 begrun, 409 u32 runlength) 410{ 411 struct iscsi_conn *conn = cmd->conn; 412 struct iscsi_datain_req *dr; 413 struct se_cmd *se_cmd = &cmd->se_cmd; 414 415 if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { 416 pr_err("Ignoring ITT: 0x%08x Data SNACK\n", 417 cmd->init_task_tag); 418 return 0; 419 } 420 421 /* 422 * Make sure the initiator is not requesting retransmission 423 * of DataSNs already acknowledged by a Data ACK SNACK. 424 */ 425 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 426 (begrun <= cmd->acked_data_sn)) { 427 pr_err("ITT: 0x%08x, Data SNACK requesting" 428 " retransmission of DataSN: 0x%08x to 0x%08x but" 429 " already acked to DataSN: 0x%08x by Data ACK SNACK," 430 " protocol error.\n", cmd->init_task_tag, begrun, 431 (begrun + runlength), cmd->acked_data_sn); 432 433 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 434 } 435 436 /* 437 * Make sure BegRun and RunLength in the Data SNACK are sane. 438 * Note: (cmd->data_sn - 1) will carry the maximum DataSN sent. 439 */ 440 if ((begrun + runlength) > (cmd->data_sn - 1)) { 441 pr_err("Initiator requesting BegRun: 0x%08x, RunLength" 442 ": 0x%08x greater than maximum DataSN: 0x%08x.\n", 443 begrun, runlength, (cmd->data_sn - 1)); 444 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, 445 buf); 446 } 447 448 dr = iscsit_allocate_datain_req(); 449 if (!dr) 450 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, 451 buf); 452 453 dr->data_sn = dr->begrun = begrun; 454 dr->runlength = runlength; 455 dr->generate_recovery_values = 1; 456 dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY; 457 458 iscsit_attach_datain_req(cmd, dr); 459 460 cmd->i_state = ISTATE_SEND_DATAIN; 461 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 462 463 return 0; 464} 465 466int iscsit_handle_recovery_datain_or_r2t( 467 struct iscsi_conn *conn, 468 unsigned char *buf, 469 itt_t init_task_tag, 470 u32 targ_xfer_tag, 471 u32 begrun, 472 u32 runlength) 473{ 474 struct iscsi_cmd *cmd; 475 476 cmd = iscsit_find_cmd_from_itt(conn, init_task_tag); 477 if (!cmd) 478 return 0; 479 480 /* 481 * FIXME: This will not work for bidi commands. 482 */ 483 switch (cmd->data_direction) { 484 case DMA_TO_DEVICE: 485 return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength); 486 case DMA_FROM_DEVICE: 487 return iscsit_handle_recovery_datain(cmd, buf, begrun, 488 runlength); 489 default: 490 pr_err("Unknown cmd->data_direction: 0x%02x\n", 491 cmd->data_direction); 492 return -1; 493 } 494 495 return 0; 496} 497 498/* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */ 499int iscsit_handle_status_snack( 500 struct iscsi_conn *conn, 501 itt_t init_task_tag, 502 u32 targ_xfer_tag, 503 u32 begrun, 504 u32 runlength) 505{ 506 struct iscsi_cmd *cmd = NULL; 507 u32 last_statsn; 508 int found_cmd; 509 510 if (!begrun) { 511 begrun = conn->exp_statsn; 512 } else if (conn->exp_statsn > begrun) { 513 pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:" 514 " 0x%08x but already got ExpStatSN: 0x%08x on CID:" 515 " %hu.\n", begrun, runlength, conn->exp_statsn, 516 conn->cid); 517 return 0; 518 } 519 520 last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength); 521 522 while (begrun < last_statsn) { 523 found_cmd = 0; 524 525 spin_lock_bh(&conn->cmd_lock); 526 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 527 if (cmd->stat_sn == begrun) { 528 found_cmd = 1; 529 break; 530 } 531 } 532 spin_unlock_bh(&conn->cmd_lock); 533 534 if (!found_cmd) { 535 pr_err("Unable to find StatSN: 0x%08x for" 536 " a Status SNACK, assuming this was a" 537 " protactic SNACK for an untransmitted" 538 " StatSN, ignoring.\n", begrun); 539 begrun++; 540 continue; 541 } 542 543 spin_lock_bh(&cmd->istate_lock); 544 if (cmd->i_state == ISTATE_SEND_DATAIN) { 545 spin_unlock_bh(&cmd->istate_lock); 546 pr_err("Ignoring Status SNACK for BegRun:" 547 " 0x%08x, RunLength: 0x%08x, assuming this was" 548 " a protactic SNACK for an untransmitted" 549 " StatSN\n", begrun, runlength); 550 begrun++; 551 continue; 552 } 553 spin_unlock_bh(&cmd->istate_lock); 554 555 cmd->i_state = ISTATE_SEND_STATUS_RECOVERY; 556 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 557 begrun++; 558 } 559 560 return 0; 561} 562 563int iscsit_handle_data_ack( 564 struct iscsi_conn *conn, 565 u32 targ_xfer_tag, 566 u32 begrun, 567 u32 runlength) 568{ 569 struct iscsi_cmd *cmd = NULL; 570 571 cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag); 572 if (!cmd) { 573 pr_err("Data ACK SNACK for TTT: 0x%08x is" 574 " invalid.\n", targ_xfer_tag); 575 return -1; 576 } 577 578 if (begrun <= cmd->acked_data_sn) { 579 pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is" 580 " less than the already acked DataSN: 0x%08x.\n", 581 cmd->init_task_tag, begrun, cmd->acked_data_sn); 582 return -1; 583 } 584 585 /* 586 * For Data ACK SNACK, BegRun is the next expected DataSN. 587 * (see iSCSI v19: 10.16.6) 588 */ 589 cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 590 cmd->acked_data_sn = (begrun - 1); 591 592 pr_debug("Received Data ACK SNACK for ITT: 0x%08x," 593 " updated acked DataSN to 0x%08x.\n", 594 cmd->init_task_tag, cmd->acked_data_sn); 595 596 return 0; 597} 598 599static int iscsit_send_recovery_r2t( 600 struct iscsi_cmd *cmd, 601 u32 offset, 602 u32 xfer_len) 603{ 604 int ret; 605 606 spin_lock_bh(&cmd->r2t_lock); 607 ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0); 608 spin_unlock_bh(&cmd->r2t_lock); 609 610 return ret; 611} 612 613int iscsit_dataout_datapduinorder_no_fbit( 614 struct iscsi_cmd *cmd, 615 struct iscsi_pdu *pdu) 616{ 617 int i, send_recovery_r2t = 0, recovery = 0; 618 u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0; 619 struct iscsi_conn *conn = cmd->conn; 620 struct iscsi_pdu *first_pdu = NULL; 621 622 /* 623 * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count 624 * of the DataOUT sequence. 625 */ 626 if (conn->sess->sess_ops->DataSequenceInOrder) { 627 for (i = 0; i < cmd->pdu_count; i++) { 628 if (cmd->pdu_list[i].seq_no == pdu->seq_no) { 629 if (!first_pdu) 630 first_pdu = &cmd->pdu_list[i]; 631 xfer_len += cmd->pdu_list[i].length; 632 pdu_count++; 633 } else if (pdu_count) 634 break; 635 } 636 } else { 637 struct iscsi_seq *seq = cmd->seq_ptr; 638 639 first_pdu = &cmd->pdu_list[seq->pdu_start]; 640 pdu_count = seq->pdu_count; 641 } 642 643 if (!first_pdu || !pdu_count) 644 return DATAOUT_CANNOT_RECOVER; 645 646 /* 647 * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu. 648 * The following ugly logic does batching of not received PDUs. 649 */ 650 for (i = 0; i < pdu_count; i++) { 651 if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) { 652 if (!send_recovery_r2t) 653 continue; 654 655 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 656 return DATAOUT_CANNOT_RECOVER; 657 658 send_recovery_r2t = length = offset = 0; 659 continue; 660 } 661 /* 662 * Set recovery = 1 for any missing, CRC failed, or timed 663 * out PDUs to let the DataOUT logic know that this sequence 664 * has not been completed yet. 665 * 666 * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED. 667 * We assume if the PDU either failed CRC or timed out 668 * that a Recovery R2T has already been sent. 669 */ 670 recovery = 1; 671 672 if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED) 673 continue; 674 675 if (!offset) 676 offset = first_pdu[i].offset; 677 length += first_pdu[i].length; 678 679 send_recovery_r2t = 1; 680 } 681 682 if (send_recovery_r2t) 683 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 684 return DATAOUT_CANNOT_RECOVER; 685 686 return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY; 687} 688 689static int iscsit_recalculate_dataout_values( 690 struct iscsi_cmd *cmd, 691 u32 pdu_offset, 692 u32 pdu_length, 693 u32 *r2t_offset, 694 u32 *r2t_length) 695{ 696 int i; 697 struct iscsi_conn *conn = cmd->conn; 698 struct iscsi_pdu *pdu = NULL; 699 700 if (conn->sess->sess_ops->DataSequenceInOrder) { 701 cmd->data_sn = 0; 702 703 if (conn->sess->sess_ops->DataPDUInOrder) { 704 *r2t_offset = cmd->write_data_done; 705 *r2t_length = (cmd->seq_end_offset - 706 cmd->write_data_done); 707 return 0; 708 } 709 710 *r2t_offset = cmd->seq_start_offset; 711 *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset); 712 713 for (i = 0; i < cmd->pdu_count; i++) { 714 pdu = &cmd->pdu_list[i]; 715 716 if (pdu->status != ISCSI_PDU_RECEIVED_OK) 717 continue; 718 719 if ((pdu->offset >= cmd->seq_start_offset) && 720 ((pdu->offset + pdu->length) <= 721 cmd->seq_end_offset)) { 722 if (!cmd->unsolicited_data) 723 cmd->next_burst_len -= pdu->length; 724 else 725 cmd->first_burst_len -= pdu->length; 726 727 cmd->write_data_done -= pdu->length; 728 pdu->status = ISCSI_PDU_NOT_RECEIVED; 729 } 730 } 731 } else { 732 struct iscsi_seq *seq = NULL; 733 734 seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length); 735 if (!seq) 736 return -1; 737 738 *r2t_offset = seq->orig_offset; 739 *r2t_length = seq->xfer_len; 740 741 cmd->write_data_done -= (seq->offset - seq->orig_offset); 742 if (cmd->immediate_data) 743 cmd->first_burst_len = cmd->write_data_done; 744 745 seq->data_sn = 0; 746 seq->offset = seq->orig_offset; 747 seq->next_burst_len = 0; 748 seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 749 750 if (conn->sess->sess_ops->DataPDUInOrder) 751 return 0; 752 753 for (i = 0; i < seq->pdu_count; i++) { 754 pdu = &cmd->pdu_list[i+seq->pdu_start]; 755 756 if (pdu->status != ISCSI_PDU_RECEIVED_OK) 757 continue; 758 759 pdu->status = ISCSI_PDU_NOT_RECEIVED; 760 } 761 } 762 763 return 0; 764} 765 766int iscsit_recover_dataout_sequence( 767 struct iscsi_cmd *cmd, 768 u32 pdu_offset, 769 u32 pdu_length) 770{ 771 u32 r2t_length = 0, r2t_offset = 0; 772 773 spin_lock_bh(&cmd->istate_lock); 774 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 775 spin_unlock_bh(&cmd->istate_lock); 776 777 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 778 &r2t_offset, &r2t_length) < 0) 779 return DATAOUT_CANNOT_RECOVER; 780 781 iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length); 782 783 return DATAOUT_WITHIN_COMMAND_RECOVERY; 784} 785 786static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void) 787{ 788 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL; 789 790 ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC); 791 if (!ooo_cmdsn) { 792 pr_err("Unable to allocate memory for" 793 " struct iscsi_ooo_cmdsn.\n"); 794 return NULL; 795 } 796 INIT_LIST_HEAD(&ooo_cmdsn->ooo_list); 797 798 return ooo_cmdsn; 799} 800 801/* 802 * Called with sess->cmdsn_mutex held. 803 */ 804static int iscsit_attach_ooo_cmdsn( 805 struct iscsi_session *sess, 806 struct iscsi_ooo_cmdsn *ooo_cmdsn) 807{ 808 struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp; 809 /* 810 * We attach the struct iscsi_ooo_cmdsn entry to the out of order 811 * list in increasing CmdSN order. 812 * This allows iscsi_execute_ooo_cmdsns() to detect any 813 * additional CmdSN holes while performing delayed execution. 814 */ 815 if (list_empty(&sess->sess_ooo_cmdsn_list)) 816 list_add_tail(&ooo_cmdsn->ooo_list, 817 &sess->sess_ooo_cmdsn_list); 818 else { 819 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 820 typeof(*ooo_tail), ooo_list); 821 /* 822 * CmdSN is greater than the tail of the list. 823 */ 824 if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn)) 825 list_add_tail(&ooo_cmdsn->ooo_list, 826 &sess->sess_ooo_cmdsn_list); 827 else { 828 /* 829 * CmdSN is either lower than the head, or somewhere 830 * in the middle. 831 */ 832 list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list, 833 ooo_list) { 834 if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn)) 835 continue; 836 837 /* Insert before this entry */ 838 list_add(&ooo_cmdsn->ooo_list, 839 ooo_tmp->ooo_list.prev); 840 break; 841 } 842 } 843 } 844 845 return 0; 846} 847 848/* 849 * Removes an struct iscsi_ooo_cmdsn from a session's list, 850 * called with struct iscsi_session->cmdsn_mutex held. 851 */ 852void iscsit_remove_ooo_cmdsn( 853 struct iscsi_session *sess, 854 struct iscsi_ooo_cmdsn *ooo_cmdsn) 855{ 856 list_del(&ooo_cmdsn->ooo_list); 857 kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 858} 859 860void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn) 861{ 862 struct iscsi_ooo_cmdsn *ooo_cmdsn; 863 struct iscsi_session *sess = conn->sess; 864 865 mutex_lock(&sess->cmdsn_mutex); 866 list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) { 867 if (ooo_cmdsn->cid != conn->cid) 868 continue; 869 870 ooo_cmdsn->cmd = NULL; 871 } 872 mutex_unlock(&sess->cmdsn_mutex); 873} 874 875/* 876 * Called with sess->cmdsn_mutex held. 877 */ 878int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess) 879{ 880 int ooo_count = 0; 881 struct iscsi_cmd *cmd = NULL; 882 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 883 884 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 885 &sess->sess_ooo_cmdsn_list, ooo_list) { 886 if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn) 887 continue; 888 889 if (!ooo_cmdsn->cmd) { 890 sess->exp_cmd_sn++; 891 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 892 continue; 893 } 894 895 cmd = ooo_cmdsn->cmd; 896 cmd->i_state = cmd->deferred_i_state; 897 ooo_count++; 898 sess->exp_cmd_sn++; 899 pr_debug("Executing out of order CmdSN: 0x%08x," 900 " incremented ExpCmdSN to 0x%08x.\n", 901 cmd->cmd_sn, sess->exp_cmd_sn); 902 903 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 904 905 if (iscsit_execute_cmd(cmd, 1) < 0) 906 return -1; 907 908 continue; 909 } 910 911 return ooo_count; 912} 913 914/* 915 * Called either: 916 * 917 * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns() 918 * or iscsi_check_received_cmdsn(). 919 * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions 920 * for immediate commands. 921 */ 922int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo) 923{ 924 struct se_cmd *se_cmd = &cmd->se_cmd; 925 struct iscsi_conn *conn = cmd->conn; 926 int lr = 0; 927 928 spin_lock_bh(&cmd->istate_lock); 929 if (ooo) 930 cmd->cmd_flags &= ~ICF_OOO_CMDSN; 931 932 switch (cmd->iscsi_opcode) { 933 case ISCSI_OP_SCSI_CMD: 934 /* 935 * Go ahead and send the CHECK_CONDITION status for 936 * any SCSI CDB exceptions that may have occurred. 937 */ 938 if (cmd->sense_reason) { 939 if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) { 940 cmd->i_state = ISTATE_SEND_STATUS; 941 spin_unlock_bh(&cmd->istate_lock); 942 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 943 cmd->i_state); 944 return 0; 945 } 946 spin_unlock_bh(&cmd->istate_lock); 947 /* 948 * Determine if delayed TASK_ABORTED status for WRITEs 949 * should be sent now if no unsolicited data out 950 * payloads are expected, or if the delayed status 951 * should be sent after unsolicited data out with 952 * ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out() 953 */ 954 if (transport_check_aborted_status(se_cmd, 955 (cmd->unsolicited_data == 0)) != 0) 956 return 0; 957 /* 958 * Otherwise send CHECK_CONDITION and sense for 959 * exception 960 */ 961 return transport_send_check_condition_and_sense(se_cmd, 962 cmd->sense_reason, 0); 963 } 964 /* 965 * Special case for delayed CmdSN with Immediate 966 * Data and/or Unsolicited Data Out attached. 967 */ 968 if (cmd->immediate_data) { 969 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 970 spin_unlock_bh(&cmd->istate_lock); 971 target_execute_cmd(&cmd->se_cmd); 972 return 0; 973 } 974 spin_unlock_bh(&cmd->istate_lock); 975 976 if (!(cmd->cmd_flags & 977 ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 978 /* 979 * Send the delayed TASK_ABORTED status for 980 * WRITEs if no more unsolicitied data is 981 * expected. 982 */ 983 if (transport_check_aborted_status(se_cmd, 1) 984 != 0) 985 return 0; 986 987 iscsit_set_dataout_sequence_values(cmd); 988 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 989 } 990 return 0; 991 } 992 /* 993 * The default handler. 994 */ 995 spin_unlock_bh(&cmd->istate_lock); 996 997 if ((cmd->data_direction == DMA_TO_DEVICE) && 998 !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 999 /* 1000 * Send the delayed TASK_ABORTED status for WRITEs if 1001 * no more nsolicitied data is expected. 1002 */ 1003 if (transport_check_aborted_status(se_cmd, 1) != 0) 1004 return 0; 1005 1006 iscsit_set_unsoliticed_dataout(cmd); 1007 } 1008 return transport_handle_cdb_direct(&cmd->se_cmd); 1009 1010 case ISCSI_OP_NOOP_OUT: 1011 case ISCSI_OP_TEXT: 1012 spin_unlock_bh(&cmd->istate_lock); 1013 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 1014 break; 1015 case ISCSI_OP_SCSI_TMFUNC: 1016 if (cmd->se_cmd.se_tmr_req->response) { 1017 spin_unlock_bh(&cmd->istate_lock); 1018 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 1019 cmd->i_state); 1020 return 0; 1021 } 1022 spin_unlock_bh(&cmd->istate_lock); 1023 1024 return transport_generic_handle_tmr(&cmd->se_cmd); 1025 case ISCSI_OP_LOGOUT: 1026 spin_unlock_bh(&cmd->istate_lock); 1027 switch (cmd->logout_reason) { 1028 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 1029 lr = iscsit_logout_closesession(cmd, cmd->conn); 1030 break; 1031 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 1032 lr = iscsit_logout_closeconnection(cmd, cmd->conn); 1033 break; 1034 case ISCSI_LOGOUT_REASON_RECOVERY: 1035 lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn); 1036 break; 1037 default: 1038 pr_err("Unknown iSCSI Logout Request Code:" 1039 " 0x%02x\n", cmd->logout_reason); 1040 return -1; 1041 } 1042 1043 return lr; 1044 default: 1045 spin_unlock_bh(&cmd->istate_lock); 1046 pr_err("Cannot perform out of order execution for" 1047 " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode); 1048 return -1; 1049 } 1050 1051 return 0; 1052} 1053 1054void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess) 1055{ 1056 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 1057 1058 mutex_lock(&sess->cmdsn_mutex); 1059 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 1060 &sess->sess_ooo_cmdsn_list, ooo_list) { 1061 1062 list_del(&ooo_cmdsn->ooo_list); 1063 kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1064 } 1065 mutex_unlock(&sess->cmdsn_mutex); 1066} 1067 1068int iscsit_handle_ooo_cmdsn( 1069 struct iscsi_session *sess, 1070 struct iscsi_cmd *cmd, 1071 u32 cmdsn) 1072{ 1073 int batch = 0; 1074 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL; 1075 1076 cmd->deferred_i_state = cmd->i_state; 1077 cmd->i_state = ISTATE_DEFERRED_CMD; 1078 cmd->cmd_flags |= ICF_OOO_CMDSN; 1079 1080 if (list_empty(&sess->sess_ooo_cmdsn_list)) 1081 batch = 1; 1082 else { 1083 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 1084 typeof(*ooo_tail), ooo_list); 1085 if (ooo_tail->cmdsn != (cmdsn - 1)) 1086 batch = 1; 1087 } 1088 1089 ooo_cmdsn = iscsit_allocate_ooo_cmdsn(); 1090 if (!ooo_cmdsn) 1091 return -ENOMEM; 1092 1093 ooo_cmdsn->cmd = cmd; 1094 ooo_cmdsn->batch_count = (batch) ? 1095 (cmdsn - sess->exp_cmd_sn) : 1; 1096 ooo_cmdsn->cid = cmd->conn->cid; 1097 ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn; 1098 ooo_cmdsn->cmdsn = cmdsn; 1099 1100 if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) { 1101 kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1102 return -ENOMEM; 1103 } 1104 1105 return 0; 1106} 1107 1108static int iscsit_set_dataout_timeout_values( 1109 struct iscsi_cmd *cmd, 1110 u32 *offset, 1111 u32 *length) 1112{ 1113 struct iscsi_conn *conn = cmd->conn; 1114 struct iscsi_r2t *r2t; 1115 1116 if (cmd->unsolicited_data) { 1117 *offset = 0; 1118 *length = (conn->sess->sess_ops->FirstBurstLength > 1119 cmd->se_cmd.data_length) ? 1120 cmd->se_cmd.data_length : 1121 conn->sess->sess_ops->FirstBurstLength; 1122 return 0; 1123 } 1124 1125 spin_lock_bh(&cmd->r2t_lock); 1126 if (list_empty(&cmd->cmd_r2t_list)) { 1127 pr_err("cmd->cmd_r2t_list is empty!\n"); 1128 spin_unlock_bh(&cmd->r2t_lock); 1129 return -1; 1130 } 1131 1132 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 1133 if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) { 1134 *offset = r2t->offset; 1135 *length = r2t->xfer_len; 1136 spin_unlock_bh(&cmd->r2t_lock); 1137 return 0; 1138 } 1139 } 1140 spin_unlock_bh(&cmd->r2t_lock); 1141 1142 pr_err("Unable to locate any incomplete DataOUT" 1143 " sequences for ITT: 0x%08x.\n", cmd->init_task_tag); 1144 1145 return -1; 1146} 1147 1148/* 1149 * NOTE: Called from interrupt (timer) context. 1150 */ 1151static void iscsit_handle_dataout_timeout(unsigned long data) 1152{ 1153 u32 pdu_length = 0, pdu_offset = 0; 1154 u32 r2t_length = 0, r2t_offset = 0; 1155 struct iscsi_cmd *cmd = (struct iscsi_cmd *) data; 1156 struct iscsi_conn *conn = cmd->conn; 1157 struct iscsi_session *sess = NULL; 1158 struct iscsi_node_attrib *na; 1159 1160 iscsit_inc_conn_usage_count(conn); 1161 1162 spin_lock_bh(&cmd->dataout_timeout_lock); 1163 if (cmd->dataout_timer_flags & ISCSI_TF_STOP) { 1164 spin_unlock_bh(&cmd->dataout_timeout_lock); 1165 iscsit_dec_conn_usage_count(conn); 1166 return; 1167 } 1168 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1169 sess = conn->sess; 1170 na = iscsit_tpg_get_node_attrib(sess); 1171 1172 if (!sess->sess_ops->ErrorRecoveryLevel) { 1173 pr_debug("Unable to recover from DataOut timeout while" 1174 " in ERL=0.\n"); 1175 goto failure; 1176 } 1177 1178 if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) { 1179 pr_debug("Command ITT: 0x%08x exceeded max retries" 1180 " for DataOUT timeout %u, closing iSCSI connection.\n", 1181 cmd->init_task_tag, na->dataout_timeout_retries); 1182 goto failure; 1183 } 1184 1185 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 1186 1187 if (conn->sess->sess_ops->DataSequenceInOrder) { 1188 if (conn->sess->sess_ops->DataPDUInOrder) { 1189 pdu_offset = cmd->write_data_done; 1190 if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength - 1191 cmd->next_burst_len)) > cmd->se_cmd.data_length) 1192 pdu_length = (cmd->se_cmd.data_length - 1193 cmd->write_data_done); 1194 else 1195 pdu_length = (conn->sess->sess_ops->MaxBurstLength - 1196 cmd->next_burst_len); 1197 } else { 1198 pdu_offset = cmd->seq_start_offset; 1199 pdu_length = (cmd->seq_end_offset - 1200 cmd->seq_start_offset); 1201 } 1202 } else { 1203 if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset, 1204 &pdu_length) < 0) 1205 goto failure; 1206 } 1207 1208 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 1209 &r2t_offset, &r2t_length) < 0) 1210 goto failure; 1211 1212 pr_debug("Command ITT: 0x%08x timed out waiting for" 1213 " completion of %sDataOUT Sequence Offset: %u, Length: %u\n", 1214 cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " : 1215 "", r2t_offset, r2t_length); 1216 1217 if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0) 1218 goto failure; 1219 1220 iscsit_start_dataout_timer(cmd, conn); 1221 spin_unlock_bh(&cmd->dataout_timeout_lock); 1222 iscsit_dec_conn_usage_count(conn); 1223 1224 return; 1225 1226failure: 1227 spin_unlock_bh(&cmd->dataout_timeout_lock); 1228 iscsit_cause_connection_reinstatement(conn, 0); 1229 iscsit_dec_conn_usage_count(conn); 1230} 1231 1232void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd) 1233{ 1234 struct iscsi_conn *conn = cmd->conn; 1235 struct iscsi_session *sess = conn->sess; 1236 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1237 1238 spin_lock_bh(&cmd->dataout_timeout_lock); 1239 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1240 spin_unlock_bh(&cmd->dataout_timeout_lock); 1241 return; 1242 } 1243 1244 mod_timer(&cmd->dataout_timer, 1245 (get_jiffies_64() + na->dataout_timeout * HZ)); 1246 pr_debug("Updated DataOUT timer for ITT: 0x%08x", 1247 cmd->init_task_tag); 1248 spin_unlock_bh(&cmd->dataout_timeout_lock); 1249} 1250 1251/* 1252 * Called with cmd->dataout_timeout_lock held. 1253 */ 1254void iscsit_start_dataout_timer( 1255 struct iscsi_cmd *cmd, 1256 struct iscsi_conn *conn) 1257{ 1258 struct iscsi_session *sess = conn->sess; 1259 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1260 1261 if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING) 1262 return; 1263 1264 pr_debug("Starting DataOUT timer for ITT: 0x%08x on" 1265 " CID: %hu.\n", cmd->init_task_tag, conn->cid); 1266 1267 init_timer(&cmd->dataout_timer); 1268 cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ); 1269 cmd->dataout_timer.data = (unsigned long)cmd; 1270 cmd->dataout_timer.function = iscsit_handle_dataout_timeout; 1271 cmd->dataout_timer_flags &= ~ISCSI_TF_STOP; 1272 cmd->dataout_timer_flags |= ISCSI_TF_RUNNING; 1273 add_timer(&cmd->dataout_timer); 1274} 1275 1276void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd) 1277{ 1278 spin_lock_bh(&cmd->dataout_timeout_lock); 1279 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1280 spin_unlock_bh(&cmd->dataout_timeout_lock); 1281 return; 1282 } 1283 cmd->dataout_timer_flags |= ISCSI_TF_STOP; 1284 spin_unlock_bh(&cmd->dataout_timeout_lock); 1285 1286 del_timer_sync(&cmd->dataout_timer); 1287 1288 spin_lock_bh(&cmd->dataout_timeout_lock); 1289 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1290 pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n", 1291 cmd->init_task_tag); 1292 spin_unlock_bh(&cmd->dataout_timeout_lock); 1293} 1294EXPORT_SYMBOL(iscsit_stop_dataout_timer); 1295