target_core_pscsi.c revision 942d82646e16725ac366d44087b8c992f2cb2190
1/******************************************************************************* 2 * Filename: target_core_pscsi.c 3 * 4 * This file contains the generic target mode <-> Linux SCSI subsystem plugin. 5 * 6 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. 7 * Copyright (c) 2005, 2006, 2007 SBE, Inc. 8 * Copyright (c) 2007-2010 Rising Tide Systems 9 * Copyright (c) 2008-2010 Linux-iSCSI.org 10 * 11 * Nicholas A. Bellinger <nab@kernel.org> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 26 * 27 ******************************************************************************/ 28 29#include <linux/string.h> 30#include <linux/parser.h> 31#include <linux/timer.h> 32#include <linux/blkdev.h> 33#include <linux/blk_types.h> 34#include <linux/slab.h> 35#include <linux/spinlock.h> 36#include <linux/genhd.h> 37#include <linux/cdrom.h> 38#include <linux/file.h> 39#include <scsi/scsi.h> 40#include <scsi/scsi_device.h> 41#include <scsi/scsi_cmnd.h> 42#include <scsi/scsi_host.h> 43#include <scsi/scsi_tcq.h> 44 45#include <target/target_core_base.h> 46#include <target/target_core_device.h> 47#include <target/target_core_transport.h> 48 49#include "target_core_pscsi.h" 50 51#define ISPRINT(a) ((a >= ' ') && (a <= '~')) 52 53static struct se_subsystem_api pscsi_template; 54 55static void pscsi_req_done(struct request *, int); 56 57/* pscsi_attach_hba(): 58 * 59 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host. 60 * from the passed SCSI Host ID. 61 */ 62static int pscsi_attach_hba(struct se_hba *hba, u32 host_id) 63{ 64 struct pscsi_hba_virt *phv; 65 66 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL); 67 if (!phv) { 68 pr_err("Unable to allocate struct pscsi_hba_virt\n"); 69 return -ENOMEM; 70 } 71 phv->phv_host_id = host_id; 72 phv->phv_mode = PHV_VIRUTAL_HOST_ID; 73 74 hba->hba_ptr = phv; 75 76 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on" 77 " Generic Target Core Stack %s\n", hba->hba_id, 78 PSCSI_VERSION, TARGET_CORE_MOD_VERSION); 79 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n", 80 hba->hba_id); 81 82 return 0; 83} 84 85static void pscsi_detach_hba(struct se_hba *hba) 86{ 87 struct pscsi_hba_virt *phv = hba->hba_ptr; 88 struct Scsi_Host *scsi_host = phv->phv_lld_host; 89 90 if (scsi_host) { 91 scsi_host_put(scsi_host); 92 93 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from" 94 " Generic Target Core\n", hba->hba_id, 95 (scsi_host->hostt->name) ? (scsi_host->hostt->name) : 96 "Unknown"); 97 } else 98 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA" 99 " from Generic Target Core\n", hba->hba_id); 100 101 kfree(phv); 102 hba->hba_ptr = NULL; 103} 104 105static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag) 106{ 107 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr; 108 struct Scsi_Host *sh = phv->phv_lld_host; 109 /* 110 * Release the struct Scsi_Host 111 */ 112 if (!mode_flag) { 113 if (!sh) 114 return 0; 115 116 phv->phv_lld_host = NULL; 117 phv->phv_mode = PHV_VIRUTAL_HOST_ID; 118 119 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough" 120 " %s\n", hba->hba_id, (sh->hostt->name) ? 121 (sh->hostt->name) : "Unknown"); 122 123 scsi_host_put(sh); 124 return 0; 125 } 126 /* 127 * Otherwise, locate struct Scsi_Host from the original passed 128 * pSCSI Host ID and enable for phba mode 129 */ 130 sh = scsi_host_lookup(phv->phv_host_id); 131 if (IS_ERR(sh)) { 132 pr_err("pSCSI: Unable to locate SCSI Host for" 133 " phv_host_id: %d\n", phv->phv_host_id); 134 return PTR_ERR(sh); 135 } 136 137 phv->phv_lld_host = sh; 138 phv->phv_mode = PHV_LLD_SCSI_HOST_NO; 139 140 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n", 141 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown"); 142 143 return 1; 144} 145 146static void pscsi_tape_read_blocksize(struct se_device *dev, 147 struct scsi_device *sdev) 148{ 149 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 150 int ret; 151 152 buf = kzalloc(12, GFP_KERNEL); 153 if (!buf) 154 return; 155 156 memset(cdb, 0, MAX_COMMAND_SIZE); 157 cdb[0] = MODE_SENSE; 158 cdb[4] = 0x0c; /* 12 bytes */ 159 160 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL, 161 HZ, 1, NULL); 162 if (ret) 163 goto out_free; 164 165 /* 166 * If MODE_SENSE still returns zero, set the default value to 1024. 167 */ 168 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]); 169 if (!sdev->sector_size) 170 sdev->sector_size = 1024; 171out_free: 172 kfree(buf); 173} 174 175static void 176pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn) 177{ 178 unsigned char *buf; 179 180 if (sdev->inquiry_len < INQUIRY_LEN) 181 return; 182 183 buf = sdev->inquiry; 184 if (!buf) 185 return; 186 /* 187 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev() 188 */ 189 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor)); 190 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model)); 191 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision)); 192} 193 194static int 195pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn) 196{ 197 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 198 int ret; 199 200 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 201 if (!buf) 202 return -ENOMEM; 203 204 memset(cdb, 0, MAX_COMMAND_SIZE); 205 cdb[0] = INQUIRY; 206 cdb[1] = 0x01; /* Query VPD */ 207 cdb[2] = 0x80; /* Unit Serial Number */ 208 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff; 209 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff); 210 211 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 212 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL); 213 if (ret) 214 goto out_free; 215 216 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]); 217 218 wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL; 219 220 kfree(buf); 221 return 0; 222 223out_free: 224 kfree(buf); 225 return -EPERM; 226} 227 228static void 229pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev, 230 struct t10_wwn *wwn) 231{ 232 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83; 233 int ident_len, page_len, off = 4, ret; 234 struct t10_vpd *vpd; 235 236 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 237 if (!buf) 238 return; 239 240 memset(cdb, 0, MAX_COMMAND_SIZE); 241 cdb[0] = INQUIRY; 242 cdb[1] = 0x01; /* Query VPD */ 243 cdb[2] = 0x83; /* Device Identifier */ 244 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff; 245 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff); 246 247 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 248 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, 249 NULL, HZ, 1, NULL); 250 if (ret) 251 goto out; 252 253 page_len = (buf[2] << 8) | buf[3]; 254 while (page_len > 0) { 255 /* Grab a pointer to the Identification descriptor */ 256 page_83 = &buf[off]; 257 ident_len = page_83[3]; 258 if (!ident_len) { 259 pr_err("page_83[3]: identifier" 260 " length zero!\n"); 261 break; 262 } 263 pr_debug("T10 VPD Identifer Length: %d\n", ident_len); 264 265 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL); 266 if (!vpd) { 267 pr_err("Unable to allocate memory for" 268 " struct t10_vpd\n"); 269 goto out; 270 } 271 INIT_LIST_HEAD(&vpd->vpd_list); 272 273 transport_set_vpd_proto_id(vpd, page_83); 274 transport_set_vpd_assoc(vpd, page_83); 275 276 if (transport_set_vpd_ident_type(vpd, page_83) < 0) { 277 off += (ident_len + 4); 278 page_len -= (ident_len + 4); 279 kfree(vpd); 280 continue; 281 } 282 if (transport_set_vpd_ident(vpd, page_83) < 0) { 283 off += (ident_len + 4); 284 page_len -= (ident_len + 4); 285 kfree(vpd); 286 continue; 287 } 288 289 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list); 290 off += (ident_len + 4); 291 page_len -= (ident_len + 4); 292 } 293 294out: 295 kfree(buf); 296} 297 298/* pscsi_add_device_to_list(): 299 * 300 * 301 */ 302static struct se_device *pscsi_add_device_to_list( 303 struct se_hba *hba, 304 struct se_subsystem_dev *se_dev, 305 struct pscsi_dev_virt *pdv, 306 struct scsi_device *sd, 307 int dev_flags) 308{ 309 struct se_device *dev; 310 struct se_dev_limits dev_limits; 311 struct request_queue *q; 312 struct queue_limits *limits; 313 314 memset(&dev_limits, 0, sizeof(struct se_dev_limits)); 315 316 if (!sd->queue_depth) { 317 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH; 318 319 pr_err("Set broken SCSI Device %d:%d:%d" 320 " queue_depth to %d\n", sd->channel, sd->id, 321 sd->lun, sd->queue_depth); 322 } 323 /* 324 * Setup the local scope queue_limits from struct request_queue->limits 325 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. 326 */ 327 q = sd->request_queue; 328 limits = &dev_limits.limits; 329 limits->logical_block_size = sd->sector_size; 330 limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q)); 331 limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q)); 332 dev_limits.hw_queue_depth = sd->queue_depth; 333 dev_limits.queue_depth = sd->queue_depth; 334 /* 335 * Setup our standard INQUIRY info into se_dev->t10_wwn 336 */ 337 pscsi_set_inquiry_info(sd, &se_dev->t10_wwn); 338 339 /* 340 * Set the pointer pdv->pdv_sd to from passed struct scsi_device, 341 * which has already been referenced with Linux SCSI code with 342 * scsi_device_get() in this file's pscsi_create_virtdevice(). 343 * 344 * The passthrough operations called by the transport_add_device_* 345 * function below will require this pointer to be set for passthroug 346 * ops. 347 * 348 * For the shutdown case in pscsi_free_device(), this struct 349 * scsi_device reference is released with Linux SCSI code 350 * scsi_device_put() and the pdv->pdv_sd cleared. 351 */ 352 pdv->pdv_sd = sd; 353 354 dev = transport_add_device_to_core_hba(hba, &pscsi_template, 355 se_dev, dev_flags, pdv, 356 &dev_limits, NULL, NULL); 357 if (!dev) { 358 pdv->pdv_sd = NULL; 359 return NULL; 360 } 361 362 /* 363 * Locate VPD WWN Information used for various purposes within 364 * the Storage Engine. 365 */ 366 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) { 367 /* 368 * If VPD Unit Serial returned GOOD status, try 369 * VPD Device Identification page (0x83). 370 */ 371 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn); 372 } 373 374 /* 375 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE. 376 */ 377 if (sd->type == TYPE_TAPE) 378 pscsi_tape_read_blocksize(dev, sd); 379 return dev; 380} 381 382static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name) 383{ 384 struct pscsi_dev_virt *pdv; 385 386 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL); 387 if (!pdv) { 388 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n"); 389 return NULL; 390 } 391 pdv->pdv_se_hba = hba; 392 393 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name); 394 return pdv; 395} 396 397/* 398 * Called with struct Scsi_Host->host_lock called. 399 */ 400static struct se_device *pscsi_create_type_disk( 401 struct scsi_device *sd, 402 struct pscsi_dev_virt *pdv, 403 struct se_subsystem_dev *se_dev, 404 struct se_hba *hba) 405 __releases(sh->host_lock) 406{ 407 struct se_device *dev; 408 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; 409 struct Scsi_Host *sh = sd->host; 410 struct block_device *bd; 411 u32 dev_flags = 0; 412 413 if (scsi_device_get(sd)) { 414 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n", 415 sh->host_no, sd->channel, sd->id, sd->lun); 416 spin_unlock_irq(sh->host_lock); 417 return NULL; 418 } 419 spin_unlock_irq(sh->host_lock); 420 /* 421 * Claim exclusive struct block_device access to struct scsi_device 422 * for TYPE_DISK using supplied udev_path 423 */ 424 bd = blkdev_get_by_path(se_dev->se_dev_udev_path, 425 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv); 426 if (IS_ERR(bd)) { 427 pr_err("pSCSI: blkdev_get_by_path() failed\n"); 428 scsi_device_put(sd); 429 return NULL; 430 } 431 pdv->pdv_bd = bd; 432 433 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); 434 if (!dev) { 435 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 436 scsi_device_put(sd); 437 return NULL; 438 } 439 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n", 440 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun); 441 442 return dev; 443} 444 445/* 446 * Called with struct Scsi_Host->host_lock called. 447 */ 448static struct se_device *pscsi_create_type_rom( 449 struct scsi_device *sd, 450 struct pscsi_dev_virt *pdv, 451 struct se_subsystem_dev *se_dev, 452 struct se_hba *hba) 453 __releases(sh->host_lock) 454{ 455 struct se_device *dev; 456 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; 457 struct Scsi_Host *sh = sd->host; 458 u32 dev_flags = 0; 459 460 if (scsi_device_get(sd)) { 461 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n", 462 sh->host_no, sd->channel, sd->id, sd->lun); 463 spin_unlock_irq(sh->host_lock); 464 return NULL; 465 } 466 spin_unlock_irq(sh->host_lock); 467 468 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); 469 if (!dev) { 470 scsi_device_put(sd); 471 return NULL; 472 } 473 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", 474 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 475 sd->channel, sd->id, sd->lun); 476 477 return dev; 478} 479 480/* 481 *Called with struct Scsi_Host->host_lock called. 482 */ 483static struct se_device *pscsi_create_type_other( 484 struct scsi_device *sd, 485 struct pscsi_dev_virt *pdv, 486 struct se_subsystem_dev *se_dev, 487 struct se_hba *hba) 488 __releases(sh->host_lock) 489{ 490 struct se_device *dev; 491 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr; 492 struct Scsi_Host *sh = sd->host; 493 u32 dev_flags = 0; 494 495 spin_unlock_irq(sh->host_lock); 496 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); 497 if (!dev) 498 return NULL; 499 500 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", 501 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 502 sd->channel, sd->id, sd->lun); 503 504 return dev; 505} 506 507static struct se_device *pscsi_create_virtdevice( 508 struct se_hba *hba, 509 struct se_subsystem_dev *se_dev, 510 void *p) 511{ 512 struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p; 513 struct se_device *dev; 514 struct scsi_device *sd; 515 struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr; 516 struct Scsi_Host *sh = phv->phv_lld_host; 517 int legacy_mode_enable = 0; 518 519 if (!pdv) { 520 pr_err("Unable to locate struct pscsi_dev_virt" 521 " parameter\n"); 522 return ERR_PTR(-EINVAL); 523 } 524 /* 525 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the 526 * struct Scsi_Host we will need to bring the TCM/pSCSI object online 527 */ 528 if (!sh) { 529 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 530 pr_err("pSCSI: Unable to locate struct" 531 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n"); 532 return ERR_PTR(-ENODEV); 533 } 534 /* 535 * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device 536 * reference, we enforce that udev_path has been set 537 */ 538 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) { 539 pr_err("pSCSI: udev_path attribute has not" 540 " been set before ENABLE=1\n"); 541 return ERR_PTR(-EINVAL); 542 } 543 /* 544 * If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID, 545 * use the original TCM hba ID to reference Linux/SCSI Host No 546 * and enable for PHV_LLD_SCSI_HOST_NO mode. 547 */ 548 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) { 549 spin_lock(&hba->device_lock); 550 if (!list_empty(&hba->hba_dev_list)) { 551 pr_err("pSCSI: Unable to set hba_mode" 552 " with active devices\n"); 553 spin_unlock(&hba->device_lock); 554 return ERR_PTR(-EEXIST); 555 } 556 spin_unlock(&hba->device_lock); 557 558 if (pscsi_pmode_enable_hba(hba, 1) != 1) 559 return ERR_PTR(-ENODEV); 560 561 legacy_mode_enable = 1; 562 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE; 563 sh = phv->phv_lld_host; 564 } else { 565 sh = scsi_host_lookup(pdv->pdv_host_id); 566 if (IS_ERR(sh)) { 567 pr_err("pSCSI: Unable to locate" 568 " pdv_host_id: %d\n", pdv->pdv_host_id); 569 return ERR_CAST(sh); 570 } 571 } 572 } else { 573 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) { 574 pr_err("pSCSI: PHV_VIRUTAL_HOST_ID set while" 575 " struct Scsi_Host exists\n"); 576 return ERR_PTR(-EEXIST); 577 } 578 } 579 580 spin_lock_irq(sh->host_lock); 581 list_for_each_entry(sd, &sh->__devices, siblings) { 582 if ((pdv->pdv_channel_id != sd->channel) || 583 (pdv->pdv_target_id != sd->id) || 584 (pdv->pdv_lun_id != sd->lun)) 585 continue; 586 /* 587 * Functions will release the held struct scsi_host->host_lock 588 * before calling calling pscsi_add_device_to_list() to register 589 * struct scsi_device with target_core_mod. 590 */ 591 switch (sd->type) { 592 case TYPE_DISK: 593 dev = pscsi_create_type_disk(sd, pdv, se_dev, hba); 594 break; 595 case TYPE_ROM: 596 dev = pscsi_create_type_rom(sd, pdv, se_dev, hba); 597 break; 598 default: 599 dev = pscsi_create_type_other(sd, pdv, se_dev, hba); 600 break; 601 } 602 603 if (!dev) { 604 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) 605 scsi_host_put(sh); 606 else if (legacy_mode_enable) { 607 pscsi_pmode_enable_hba(hba, 0); 608 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 609 } 610 pdv->pdv_sd = NULL; 611 return ERR_PTR(-ENODEV); 612 } 613 return dev; 614 } 615 spin_unlock_irq(sh->host_lock); 616 617 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no, 618 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id); 619 620 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) 621 scsi_host_put(sh); 622 else if (legacy_mode_enable) { 623 pscsi_pmode_enable_hba(hba, 0); 624 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 625 } 626 627 return ERR_PTR(-ENODEV); 628} 629 630/* pscsi_free_device(): (Part of se_subsystem_api_t template) 631 * 632 * 633 */ 634static void pscsi_free_device(void *p) 635{ 636 struct pscsi_dev_virt *pdv = p; 637 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr; 638 struct scsi_device *sd = pdv->pdv_sd; 639 640 if (sd) { 641 /* 642 * Release exclusive pSCSI internal struct block_device claim for 643 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk() 644 */ 645 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) { 646 blkdev_put(pdv->pdv_bd, 647 FMODE_WRITE|FMODE_READ|FMODE_EXCL); 648 pdv->pdv_bd = NULL; 649 } 650 /* 651 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference 652 * to struct Scsi_Host now. 653 */ 654 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) && 655 (phv->phv_lld_host != NULL)) 656 scsi_host_put(phv->phv_lld_host); 657 658 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM)) 659 scsi_device_put(sd); 660 661 pdv->pdv_sd = NULL; 662 } 663 664 kfree(pdv); 665} 666 667static inline struct pscsi_plugin_task *PSCSI_TASK(struct se_task *task) 668{ 669 return container_of(task, struct pscsi_plugin_task, pscsi_task); 670} 671 672 673/* pscsi_transport_complete(): 674 * 675 * 676 */ 677static int pscsi_transport_complete(struct se_task *task) 678{ 679 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; 680 struct scsi_device *sd = pdv->pdv_sd; 681 int result; 682 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 683 unsigned char *cdb = &pt->pscsi_cdb[0]; 684 685 result = pt->pscsi_result; 686 /* 687 * Hack to make sure that Write-Protect modepage is set if R/O mode is 688 * forced. 689 */ 690 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) && 691 (status_byte(result) << 1) == SAM_STAT_GOOD) { 692 if (!task->task_se_cmd->se_deve) 693 goto after_mode_sense; 694 695 if (task->task_se_cmd->se_deve->lun_flags & 696 TRANSPORT_LUNFLAGS_READ_ONLY) { 697 unsigned char *buf = transport_kmap_first_data_page(task->task_se_cmd); 698 699 if (cdb[0] == MODE_SENSE_10) { 700 if (!(buf[3] & 0x80)) 701 buf[3] |= 0x80; 702 } else { 703 if (!(buf[2] & 0x80)) 704 buf[2] |= 0x80; 705 } 706 707 transport_kunmap_first_data_page(task->task_se_cmd); 708 } 709 } 710after_mode_sense: 711 712 if (sd->type != TYPE_TAPE) 713 goto after_mode_select; 714 715 /* 716 * Hack to correctly obtain the initiator requested blocksize for 717 * TYPE_TAPE. Since this value is dependent upon each tape media, 718 * struct scsi_device->sector_size will not contain the correct value 719 * by default, so we go ahead and set it so 720 * TRANSPORT(dev)->get_blockdev() returns the correct value to the 721 * storage engine. 722 */ 723 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) && 724 (status_byte(result) << 1) == SAM_STAT_GOOD) { 725 unsigned char *buf; 726 struct scatterlist *sg = task->task_sg; 727 u16 bdl; 728 u32 blocksize; 729 730 buf = sg_virt(&sg[0]); 731 if (!buf) { 732 pr_err("Unable to get buf for scatterlist\n"); 733 goto after_mode_select; 734 } 735 736 if (cdb[0] == MODE_SELECT) 737 bdl = (buf[3]); 738 else 739 bdl = (buf[6] << 8) | (buf[7]); 740 741 if (!bdl) 742 goto after_mode_select; 743 744 if (cdb[0] == MODE_SELECT) 745 blocksize = (buf[9] << 16) | (buf[10] << 8) | 746 (buf[11]); 747 else 748 blocksize = (buf[13] << 16) | (buf[14] << 8) | 749 (buf[15]); 750 751 sd->sector_size = blocksize; 752 } 753after_mode_select: 754 755 if (status_byte(result) & CHECK_CONDITION) 756 return 1; 757 758 return 0; 759} 760 761static struct se_task * 762pscsi_alloc_task(unsigned char *cdb) 763{ 764 struct pscsi_plugin_task *pt; 765 766 /* 767 * Dynamically alloc cdb space, since it may be larger than 768 * TCM_MAX_COMMAND_SIZE 769 */ 770 pt = kzalloc(sizeof(*pt) + scsi_command_size(cdb), GFP_KERNEL); 771 if (!pt) { 772 pr_err("Unable to allocate struct pscsi_plugin_task\n"); 773 return NULL; 774 } 775 776 return &pt->pscsi_task; 777} 778 779static void pscsi_free_task(struct se_task *task) 780{ 781 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 782 783 /* 784 * We do not release the bio(s) here associated with this task, as 785 * this is handled by bio_put() and pscsi_bi_endio(). 786 */ 787 kfree(pt); 788} 789 790enum { 791 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id, 792 Opt_scsi_lun_id, Opt_err 793}; 794 795static match_table_t tokens = { 796 {Opt_scsi_host_id, "scsi_host_id=%d"}, 797 {Opt_scsi_channel_id, "scsi_channel_id=%d"}, 798 {Opt_scsi_target_id, "scsi_target_id=%d"}, 799 {Opt_scsi_lun_id, "scsi_lun_id=%d"}, 800 {Opt_err, NULL} 801}; 802 803static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba, 804 struct se_subsystem_dev *se_dev, 805 const char *page, 806 ssize_t count) 807{ 808 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; 809 struct pscsi_hba_virt *phv = hba->hba_ptr; 810 char *orig, *ptr, *opts; 811 substring_t args[MAX_OPT_ARGS]; 812 int ret = 0, arg, token; 813 814 opts = kstrdup(page, GFP_KERNEL); 815 if (!opts) 816 return -ENOMEM; 817 818 orig = opts; 819 820 while ((ptr = strsep(&opts, ",")) != NULL) { 821 if (!*ptr) 822 continue; 823 824 token = match_token(ptr, tokens, args); 825 switch (token) { 826 case Opt_scsi_host_id: 827 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 828 pr_err("PSCSI[%d]: Unable to accept" 829 " scsi_host_id while phv_mode ==" 830 " PHV_LLD_SCSI_HOST_NO\n", 831 phv->phv_host_id); 832 ret = -EINVAL; 833 goto out; 834 } 835 match_int(args, &arg); 836 pdv->pdv_host_id = arg; 837 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:" 838 " %d\n", phv->phv_host_id, pdv->pdv_host_id); 839 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID; 840 break; 841 case Opt_scsi_channel_id: 842 match_int(args, &arg); 843 pdv->pdv_channel_id = arg; 844 pr_debug("PSCSI[%d]: Referencing SCSI Channel" 845 " ID: %d\n", phv->phv_host_id, 846 pdv->pdv_channel_id); 847 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID; 848 break; 849 case Opt_scsi_target_id: 850 match_int(args, &arg); 851 pdv->pdv_target_id = arg; 852 pr_debug("PSCSI[%d]: Referencing SCSI Target" 853 " ID: %d\n", phv->phv_host_id, 854 pdv->pdv_target_id); 855 pdv->pdv_flags |= PDF_HAS_TARGET_ID; 856 break; 857 case Opt_scsi_lun_id: 858 match_int(args, &arg); 859 pdv->pdv_lun_id = arg; 860 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:" 861 " %d\n", phv->phv_host_id, pdv->pdv_lun_id); 862 pdv->pdv_flags |= PDF_HAS_LUN_ID; 863 break; 864 default: 865 break; 866 } 867 } 868 869out: 870 kfree(orig); 871 return (!ret) ? count : ret; 872} 873 874static ssize_t pscsi_check_configfs_dev_params( 875 struct se_hba *hba, 876 struct se_subsystem_dev *se_dev) 877{ 878 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; 879 880 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) || 881 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) || 882 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) { 883 pr_err("Missing scsi_channel_id=, scsi_target_id= and" 884 " scsi_lun_id= parameters\n"); 885 return -EINVAL; 886 } 887 888 return 0; 889} 890 891static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba, 892 struct se_subsystem_dev *se_dev, 893 char *b) 894{ 895 struct pscsi_hba_virt *phv = hba->hba_ptr; 896 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; 897 struct scsi_device *sd = pdv->pdv_sd; 898 unsigned char host_id[16]; 899 ssize_t bl; 900 int i; 901 902 if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) 903 snprintf(host_id, 16, "%d", pdv->pdv_host_id); 904 else 905 snprintf(host_id, 16, "PHBA Mode"); 906 907 bl = sprintf(b, "SCSI Device Bus Location:" 908 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n", 909 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id, 910 host_id); 911 912 if (sd) { 913 bl += sprintf(b + bl, " "); 914 bl += sprintf(b + bl, "Vendor: "); 915 for (i = 0; i < 8; i++) { 916 if (ISPRINT(sd->vendor[i])) /* printable character? */ 917 bl += sprintf(b + bl, "%c", sd->vendor[i]); 918 else 919 bl += sprintf(b + bl, " "); 920 } 921 bl += sprintf(b + bl, " Model: "); 922 for (i = 0; i < 16; i++) { 923 if (ISPRINT(sd->model[i])) /* printable character ? */ 924 bl += sprintf(b + bl, "%c", sd->model[i]); 925 else 926 bl += sprintf(b + bl, " "); 927 } 928 bl += sprintf(b + bl, " Rev: "); 929 for (i = 0; i < 4; i++) { 930 if (ISPRINT(sd->rev[i])) /* printable character ? */ 931 bl += sprintf(b + bl, "%c", sd->rev[i]); 932 else 933 bl += sprintf(b + bl, " "); 934 } 935 bl += sprintf(b + bl, "\n"); 936 } 937 return bl; 938} 939 940static void pscsi_bi_endio(struct bio *bio, int error) 941{ 942 bio_put(bio); 943} 944 945static inline struct bio *pscsi_get_bio(int sg_num) 946{ 947 struct bio *bio; 948 /* 949 * Use bio_malloc() following the comment in for bio -> struct request 950 * in block/blk-core.c:blk_make_request() 951 */ 952 bio = bio_kmalloc(GFP_KERNEL, sg_num); 953 if (!bio) { 954 pr_err("PSCSI: bio_kmalloc() failed\n"); 955 return NULL; 956 } 957 bio->bi_end_io = pscsi_bi_endio; 958 959 return bio; 960} 961 962static int pscsi_map_sg(struct se_task *task, struct scatterlist *task_sg, 963 struct bio **hbio) 964{ 965 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; 966 u32 task_sg_num = task->task_sg_nents; 967 struct bio *bio = NULL, *tbio = NULL; 968 struct page *page; 969 struct scatterlist *sg; 970 u32 data_len = task->task_size, i, len, bytes, off; 971 int nr_pages = (task->task_size + task_sg[0].offset + 972 PAGE_SIZE - 1) >> PAGE_SHIFT; 973 int nr_vecs = 0, rc, ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; 974 int rw = (task->task_data_direction == DMA_TO_DEVICE); 975 976 *hbio = NULL; 977 978 pr_debug("PSCSI: nr_pages: %d\n", nr_pages); 979 980 for_each_sg(task_sg, sg, task_sg_num, i) { 981 page = sg_page(sg); 982 off = sg->offset; 983 len = sg->length; 984 985 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i, 986 page, len, off); 987 988 while (len > 0 && data_len > 0) { 989 bytes = min_t(unsigned int, len, PAGE_SIZE - off); 990 bytes = min(bytes, data_len); 991 992 if (!bio) { 993 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages); 994 nr_pages -= nr_vecs; 995 /* 996 * Calls bio_kmalloc() and sets bio->bi_end_io() 997 */ 998 bio = pscsi_get_bio(nr_vecs); 999 if (!bio) 1000 goto fail; 1001 1002 if (rw) 1003 bio->bi_rw |= REQ_WRITE; 1004 1005 pr_debug("PSCSI: Allocated bio: %p," 1006 " dir: %s nr_vecs: %d\n", bio, 1007 (rw) ? "rw" : "r", nr_vecs); 1008 /* 1009 * Set *hbio pointer to handle the case: 1010 * nr_pages > BIO_MAX_PAGES, where additional 1011 * bios need to be added to complete a given 1012 * struct se_task 1013 */ 1014 if (!*hbio) 1015 *hbio = tbio = bio; 1016 else 1017 tbio = tbio->bi_next = bio; 1018 } 1019 1020 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d" 1021 " bio: %p page: %p len: %d off: %d\n", i, bio, 1022 page, len, off); 1023 1024 rc = bio_add_pc_page(pdv->pdv_sd->request_queue, 1025 bio, page, bytes, off); 1026 if (rc != bytes) 1027 goto fail; 1028 1029 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n", 1030 bio->bi_vcnt, nr_vecs); 1031 1032 if (bio->bi_vcnt > nr_vecs) { 1033 pr_debug("PSCSI: Reached bio->bi_vcnt max:" 1034 " %d i: %d bio: %p, allocating another" 1035 " bio\n", bio->bi_vcnt, i, bio); 1036 /* 1037 * Clear the pointer so that another bio will 1038 * be allocated with pscsi_get_bio() above, the 1039 * current bio has already been set *tbio and 1040 * bio->bi_next. 1041 */ 1042 bio = NULL; 1043 } 1044 1045 page++; 1046 len -= bytes; 1047 data_len -= bytes; 1048 off = 0; 1049 } 1050 } 1051 1052 return task->task_sg_nents; 1053fail: 1054 while (*hbio) { 1055 bio = *hbio; 1056 *hbio = (*hbio)->bi_next; 1057 bio->bi_next = NULL; 1058 bio_endio(bio, 0); /* XXX: should be error */ 1059 } 1060 return ret; 1061} 1062 1063static int pscsi_do_task(struct se_task *task) 1064{ 1065 struct pscsi_dev_virt *pdv = task->se_dev->dev_ptr; 1066 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 1067 struct request *req; 1068 struct bio *hbio; 1069 int ret; 1070 1071 if (task->task_se_cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) { 1072 req = blk_get_request(pdv->pdv_sd->request_queue, 1073 (task->task_data_direction == DMA_TO_DEVICE), 1074 GFP_KERNEL); 1075 if (!req || IS_ERR(req)) { 1076 pr_err("PSCSI: blk_get_request() failed: %ld\n", 1077 req ? IS_ERR(req) : -ENOMEM); 1078 return PYX_TRANSPORT_LU_COMM_FAILURE; 1079 } 1080 } else { 1081 BUG_ON(!task->task_size); 1082 1083 /* 1084 * Setup the main struct request for the task->task_sg[] payload 1085 */ 1086 ret = pscsi_map_sg(task, task->task_sg, &hbio); 1087 if (ret < 0) 1088 return PYX_TRANSPORT_LU_COMM_FAILURE; 1089 1090 req = blk_make_request(pdv->pdv_sd->request_queue, hbio, 1091 GFP_KERNEL); 1092 if (!req) { 1093 pr_err("pSCSI: blk_make_request() failed\n"); 1094 goto fail; 1095 } 1096 1097 if (task->task_sg_bidi) { 1098 /* 1099 * If present, set up the extra BIDI-COMMAND SCSI READ 1100 * struct request and payload. 1101 */ 1102 ret = pscsi_map_sg(task, task->task_sg_bidi, &hbio); 1103 if (ret < 0) { 1104 /* XXX: free the main request? */ 1105 return PYX_TRANSPORT_LU_COMM_FAILURE; 1106 } 1107 1108 /* 1109 * Setup the secondary pt->pscsi_req->next_rq used for the extra 1110 * BIDI READ payload. 1111 */ 1112 req->next_rq = blk_make_request(pdv->pdv_sd->request_queue, 1113 hbio, GFP_KERNEL); 1114 if (!req) { 1115 pr_err("pSCSI: blk_make_request() failed for BIDI\n"); 1116 /* XXX: free the main request? */ 1117 goto fail; 1118 } 1119 1120 req->next_rq->cmd_type = REQ_TYPE_BLOCK_PC; 1121 } 1122 } 1123 1124 req->cmd_type = REQ_TYPE_BLOCK_PC; 1125 req->end_io = pscsi_req_done; 1126 req->end_io_data = task; 1127 req->cmd_len = scsi_command_size(pt->pscsi_cdb); 1128 req->cmd = &pt->pscsi_cdb[0]; 1129 req->sense = &pt->pscsi_sense[0]; 1130 req->sense_len = 0; 1131 if (pdv->pdv_sd->type == TYPE_DISK) 1132 req->timeout = PS_TIMEOUT_DISK; 1133 else 1134 req->timeout = PS_TIMEOUT_OTHER; 1135 req->retries = PS_RETRY; 1136 1137 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req, 1138 (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG), 1139 pscsi_req_done); 1140 1141 return PYX_TRANSPORT_SENT_TO_TRANSPORT; 1142 1143fail: 1144 while (hbio) { 1145 struct bio *bio = hbio; 1146 hbio = hbio->bi_next; 1147 bio->bi_next = NULL; 1148 bio_endio(bio, 0); /* XXX: should be error */ 1149 } 1150 return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; 1151} 1152 1153 1154/* pscsi_get_cdb(): 1155 * 1156 * 1157 */ 1158static unsigned char *pscsi_get_cdb(struct se_task *task) 1159{ 1160 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 1161 1162 return pt->pscsi_cdb; 1163} 1164 1165/* pscsi_get_sense_buffer(): 1166 * 1167 * 1168 */ 1169static unsigned char *pscsi_get_sense_buffer(struct se_task *task) 1170{ 1171 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 1172 1173 return (unsigned char *)&pt->pscsi_sense[0]; 1174} 1175 1176/* pscsi_get_device_rev(): 1177 * 1178 * 1179 */ 1180static u32 pscsi_get_device_rev(struct se_device *dev) 1181{ 1182 struct pscsi_dev_virt *pdv = dev->dev_ptr; 1183 struct scsi_device *sd = pdv->pdv_sd; 1184 1185 return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1; 1186} 1187 1188/* pscsi_get_device_type(): 1189 * 1190 * 1191 */ 1192static u32 pscsi_get_device_type(struct se_device *dev) 1193{ 1194 struct pscsi_dev_virt *pdv = dev->dev_ptr; 1195 struct scsi_device *sd = pdv->pdv_sd; 1196 1197 return sd->type; 1198} 1199 1200static sector_t pscsi_get_blocks(struct se_device *dev) 1201{ 1202 struct pscsi_dev_virt *pdv = dev->dev_ptr; 1203 1204 if (pdv->pdv_bd && pdv->pdv_bd->bd_part) 1205 return pdv->pdv_bd->bd_part->nr_sects; 1206 1207 dump_stack(); 1208 return 0; 1209} 1210 1211/* pscsi_handle_SAM_STATUS_failures(): 1212 * 1213 * 1214 */ 1215static inline void pscsi_process_SAM_status( 1216 struct se_task *task, 1217 struct pscsi_plugin_task *pt) 1218{ 1219 task->task_scsi_status = status_byte(pt->pscsi_result); 1220 if (task->task_scsi_status) { 1221 task->task_scsi_status <<= 1; 1222 pr_debug("PSCSI Status Byte exception at task: %p CDB:" 1223 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0], 1224 pt->pscsi_result); 1225 } 1226 1227 switch (host_byte(pt->pscsi_result)) { 1228 case DID_OK: 1229 transport_complete_task(task, (!task->task_scsi_status)); 1230 break; 1231 default: 1232 pr_debug("PSCSI Host Byte exception at task: %p CDB:" 1233 " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0], 1234 pt->pscsi_result); 1235 task->task_scsi_status = SAM_STAT_CHECK_CONDITION; 1236 task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1237 task->task_se_cmd->transport_error_status = 1238 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1239 transport_complete_task(task, 0); 1240 break; 1241 } 1242} 1243 1244static void pscsi_req_done(struct request *req, int uptodate) 1245{ 1246 struct se_task *task = req->end_io_data; 1247 struct pscsi_plugin_task *pt = PSCSI_TASK(task); 1248 1249 pt->pscsi_result = req->errors; 1250 pt->pscsi_resid = req->resid_len; 1251 1252 pscsi_process_SAM_status(task, pt); 1253 /* 1254 * Release BIDI-READ if present 1255 */ 1256 if (req->next_rq != NULL) 1257 __blk_put_request(req->q, req->next_rq); 1258 1259 __blk_put_request(req->q, req); 1260} 1261 1262static struct se_subsystem_api pscsi_template = { 1263 .name = "pscsi", 1264 .owner = THIS_MODULE, 1265 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV, 1266 .attach_hba = pscsi_attach_hba, 1267 .detach_hba = pscsi_detach_hba, 1268 .pmode_enable_hba = pscsi_pmode_enable_hba, 1269 .allocate_virtdevice = pscsi_allocate_virtdevice, 1270 .create_virtdevice = pscsi_create_virtdevice, 1271 .free_device = pscsi_free_device, 1272 .transport_complete = pscsi_transport_complete, 1273 .alloc_task = pscsi_alloc_task, 1274 .do_task = pscsi_do_task, 1275 .free_task = pscsi_free_task, 1276 .check_configfs_dev_params = pscsi_check_configfs_dev_params, 1277 .set_configfs_dev_params = pscsi_set_configfs_dev_params, 1278 .show_configfs_dev_params = pscsi_show_configfs_dev_params, 1279 .get_cdb = pscsi_get_cdb, 1280 .get_sense_buffer = pscsi_get_sense_buffer, 1281 .get_device_rev = pscsi_get_device_rev, 1282 .get_device_type = pscsi_get_device_type, 1283 .get_blocks = pscsi_get_blocks, 1284}; 1285 1286static int __init pscsi_module_init(void) 1287{ 1288 return transport_subsystem_register(&pscsi_template); 1289} 1290 1291static void pscsi_module_exit(void) 1292{ 1293 transport_subsystem_release(&pscsi_template); 1294} 1295 1296MODULE_DESCRIPTION("TCM PSCSI subsystem plugin"); 1297MODULE_AUTHOR("nab@Linux-iSCSI.org"); 1298MODULE_LICENSE("GPL"); 1299 1300module_init(pscsi_module_init); 1301module_exit(pscsi_module_exit); 1302