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/ratelimit.h> 39 #include <linux/module.h> 40 #include <asm/unaligned.h> 41 42 #include <scsi/scsi.h> 43 #include <scsi/scsi_device.h> 44 #include <scsi/scsi_cmnd.h> 45 #include <scsi/scsi_host.h> 46 #include <scsi/scsi_tcq.h> 47 48 #include <target/target_core_base.h> 49 #include <target/target_core_backend.h> 50 51 #include "target_core_alua.h" 52 #include "target_core_pscsi.h" 53 54 #define ISPRINT(a) ((a >= ' ') && (a <= '~')) 55 56 static struct se_subsystem_api pscsi_template; 57 58 static int pscsi_execute_cmd(struct se_cmd *cmd); 59 static void pscsi_req_done(struct request *, int); 60 61 /* pscsi_attach_hba(): 62 * 63 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host. 64 * from the passed SCSI Host ID. 65 */ 66 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id) 67 { 68 struct pscsi_hba_virt *phv; 69 70 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL); 71 if (!phv) { 72 pr_err("Unable to allocate struct pscsi_hba_virt\n"); 73 return -ENOMEM; 74 } 75 phv->phv_host_id = host_id; 76 phv->phv_mode = PHV_VIRTUAL_HOST_ID; 77 78 hba->hba_ptr = phv; 79 80 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on" 81 " Generic Target Core Stack %s\n", hba->hba_id, 82 PSCSI_VERSION, TARGET_CORE_MOD_VERSION); 83 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n", 84 hba->hba_id); 85 86 return 0; 87 } 88 89 static void pscsi_detach_hba(struct se_hba *hba) 90 { 91 struct pscsi_hba_virt *phv = hba->hba_ptr; 92 struct Scsi_Host *scsi_host = phv->phv_lld_host; 93 94 if (scsi_host) { 95 scsi_host_put(scsi_host); 96 97 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from" 98 " Generic Target Core\n", hba->hba_id, 99 (scsi_host->hostt->name) ? (scsi_host->hostt->name) : 100 "Unknown"); 101 } else 102 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA" 103 " from Generic Target Core\n", hba->hba_id); 104 105 kfree(phv); 106 hba->hba_ptr = NULL; 107 } 108 109 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag) 110 { 111 struct pscsi_hba_virt *phv = hba->hba_ptr; 112 struct Scsi_Host *sh = phv->phv_lld_host; 113 /* 114 * Release the struct Scsi_Host 115 */ 116 if (!mode_flag) { 117 if (!sh) 118 return 0; 119 120 phv->phv_lld_host = NULL; 121 phv->phv_mode = PHV_VIRTUAL_HOST_ID; 122 123 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough" 124 " %s\n", hba->hba_id, (sh->hostt->name) ? 125 (sh->hostt->name) : "Unknown"); 126 127 scsi_host_put(sh); 128 return 0; 129 } 130 /* 131 * Otherwise, locate struct Scsi_Host from the original passed 132 * pSCSI Host ID and enable for phba mode 133 */ 134 sh = scsi_host_lookup(phv->phv_host_id); 135 if (IS_ERR(sh)) { 136 pr_err("pSCSI: Unable to locate SCSI Host for" 137 " phv_host_id: %d\n", phv->phv_host_id); 138 return PTR_ERR(sh); 139 } 140 141 phv->phv_lld_host = sh; 142 phv->phv_mode = PHV_LLD_SCSI_HOST_NO; 143 144 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n", 145 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown"); 146 147 return 1; 148 } 149 150 static void pscsi_tape_read_blocksize(struct se_device *dev, 151 struct scsi_device *sdev) 152 { 153 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 154 int ret; 155 156 buf = kzalloc(12, GFP_KERNEL); 157 if (!buf) 158 return; 159 160 memset(cdb, 0, MAX_COMMAND_SIZE); 161 cdb[0] = MODE_SENSE; 162 cdb[4] = 0x0c; /* 12 bytes */ 163 164 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL, 165 HZ, 1, NULL); 166 if (ret) 167 goto out_free; 168 169 /* 170 * If MODE_SENSE still returns zero, set the default value to 1024. 171 */ 172 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]); 173 if (!sdev->sector_size) 174 sdev->sector_size = 1024; 175 out_free: 176 kfree(buf); 177 } 178 179 static void 180 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn) 181 { 182 unsigned char *buf; 183 184 if (sdev->inquiry_len < INQUIRY_LEN) 185 return; 186 187 buf = sdev->inquiry; 188 if (!buf) 189 return; 190 /* 191 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev() 192 */ 193 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor)); 194 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model)); 195 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision)); 196 } 197 198 static int 199 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn) 200 { 201 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 202 int ret; 203 204 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 205 if (!buf) 206 return -ENOMEM; 207 208 memset(cdb, 0, MAX_COMMAND_SIZE); 209 cdb[0] = INQUIRY; 210 cdb[1] = 0x01; /* Query VPD */ 211 cdb[2] = 0x80; /* Unit Serial Number */ 212 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff; 213 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff); 214 215 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 216 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL); 217 if (ret) 218 goto out_free; 219 220 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]); 221 222 wwn->t10_sub_dev->su_dev_flags |= SDF_FIRMWARE_VPD_UNIT_SERIAL; 223 224 kfree(buf); 225 return 0; 226 227 out_free: 228 kfree(buf); 229 return -EPERM; 230 } 231 232 static void 233 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev, 234 struct t10_wwn *wwn) 235 { 236 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83; 237 int ident_len, page_len, off = 4, ret; 238 struct t10_vpd *vpd; 239 240 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 241 if (!buf) 242 return; 243 244 memset(cdb, 0, MAX_COMMAND_SIZE); 245 cdb[0] = INQUIRY; 246 cdb[1] = 0x01; /* Query VPD */ 247 cdb[2] = 0x83; /* Device Identifier */ 248 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff; 249 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff); 250 251 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 252 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, 253 NULL, HZ, 1, NULL); 254 if (ret) 255 goto out; 256 257 page_len = (buf[2] << 8) | buf[3]; 258 while (page_len > 0) { 259 /* Grab a pointer to the Identification descriptor */ 260 page_83 = &buf[off]; 261 ident_len = page_83[3]; 262 if (!ident_len) { 263 pr_err("page_83[3]: identifier" 264 " length zero!\n"); 265 break; 266 } 267 pr_debug("T10 VPD Identifer Length: %d\n", ident_len); 268 269 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL); 270 if (!vpd) { 271 pr_err("Unable to allocate memory for" 272 " struct t10_vpd\n"); 273 goto out; 274 } 275 INIT_LIST_HEAD(&vpd->vpd_list); 276 277 transport_set_vpd_proto_id(vpd, page_83); 278 transport_set_vpd_assoc(vpd, page_83); 279 280 if (transport_set_vpd_ident_type(vpd, page_83) < 0) { 281 off += (ident_len + 4); 282 page_len -= (ident_len + 4); 283 kfree(vpd); 284 continue; 285 } 286 if (transport_set_vpd_ident(vpd, page_83) < 0) { 287 off += (ident_len + 4); 288 page_len -= (ident_len + 4); 289 kfree(vpd); 290 continue; 291 } 292 293 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list); 294 off += (ident_len + 4); 295 page_len -= (ident_len + 4); 296 } 297 298 out: 299 kfree(buf); 300 } 301 302 /* pscsi_add_device_to_list(): 303 * 304 * 305 */ 306 static struct se_device *pscsi_add_device_to_list( 307 struct se_hba *hba, 308 struct se_subsystem_dev *se_dev, 309 struct pscsi_dev_virt *pdv, 310 struct scsi_device *sd, 311 int dev_flags) 312 { 313 struct se_device *dev; 314 struct se_dev_limits dev_limits; 315 struct request_queue *q; 316 struct queue_limits *limits; 317 318 memset(&dev_limits, 0, sizeof(struct se_dev_limits)); 319 320 if (!sd->queue_depth) { 321 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH; 322 323 pr_err("Set broken SCSI Device %d:%d:%d" 324 " queue_depth to %d\n", sd->channel, sd->id, 325 sd->lun, sd->queue_depth); 326 } 327 /* 328 * Setup the local scope queue_limits from struct request_queue->limits 329 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. 330 */ 331 q = sd->request_queue; 332 limits = &dev_limits.limits; 333 limits->logical_block_size = sd->sector_size; 334 limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q)); 335 limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q)); 336 dev_limits.hw_queue_depth = sd->queue_depth; 337 dev_limits.queue_depth = sd->queue_depth; 338 /* 339 * Setup our standard INQUIRY info into se_dev->t10_wwn 340 */ 341 pscsi_set_inquiry_info(sd, &se_dev->t10_wwn); 342 343 /* 344 * Set the pointer pdv->pdv_sd to from passed struct scsi_device, 345 * which has already been referenced with Linux SCSI code with 346 * scsi_device_get() in this file's pscsi_create_virtdevice(). 347 * 348 * The passthrough operations called by the transport_add_device_* 349 * function below will require this pointer to be set for passthroug 350 * ops. 351 * 352 * For the shutdown case in pscsi_free_device(), this struct 353 * scsi_device reference is released with Linux SCSI code 354 * scsi_device_put() and the pdv->pdv_sd cleared. 355 */ 356 pdv->pdv_sd = sd; 357 dev = transport_add_device_to_core_hba(hba, &pscsi_template, 358 se_dev, dev_flags, pdv, 359 &dev_limits, NULL, NULL); 360 if (!dev) { 361 pdv->pdv_sd = NULL; 362 return NULL; 363 } 364 365 /* 366 * Locate VPD WWN Information used for various purposes within 367 * the Storage Engine. 368 */ 369 if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) { 370 /* 371 * If VPD Unit Serial returned GOOD status, try 372 * VPD Device Identification page (0x83). 373 */ 374 pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn); 375 } 376 377 /* 378 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE. 379 */ 380 if (sd->type == TYPE_TAPE) 381 pscsi_tape_read_blocksize(dev, sd); 382 return dev; 383 } 384 385 static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name) 386 { 387 struct pscsi_dev_virt *pdv; 388 389 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL); 390 if (!pdv) { 391 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n"); 392 return NULL; 393 } 394 pdv->pdv_se_hba = hba; 395 396 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name); 397 return pdv; 398 } 399 400 /* 401 * Called with struct Scsi_Host->host_lock called. 402 */ 403 static struct se_device *pscsi_create_type_disk( 404 struct scsi_device *sd, 405 struct pscsi_dev_virt *pdv, 406 struct se_subsystem_dev *se_dev, 407 struct se_hba *hba) 408 __releases(sh->host_lock) 409 { 410 struct se_device *dev; 411 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr; 412 struct Scsi_Host *sh = sd->host; 413 struct block_device *bd; 414 u32 dev_flags = 0; 415 416 if (scsi_device_get(sd)) { 417 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n", 418 sh->host_no, sd->channel, sd->id, sd->lun); 419 spin_unlock_irq(sh->host_lock); 420 return NULL; 421 } 422 spin_unlock_irq(sh->host_lock); 423 /* 424 * Claim exclusive struct block_device access to struct scsi_device 425 * for TYPE_DISK using supplied udev_path 426 */ 427 bd = blkdev_get_by_path(se_dev->se_dev_udev_path, 428 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv); 429 if (IS_ERR(bd)) { 430 pr_err("pSCSI: blkdev_get_by_path() failed\n"); 431 scsi_device_put(sd); 432 return NULL; 433 } 434 pdv->pdv_bd = bd; 435 436 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); 437 if (!dev) { 438 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 439 scsi_device_put(sd); 440 return NULL; 441 } 442 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n", 443 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun); 444 445 return dev; 446 } 447 448 /* 449 * Called with struct Scsi_Host->host_lock called. 450 */ 451 static struct se_device *pscsi_create_type_rom( 452 struct scsi_device *sd, 453 struct pscsi_dev_virt *pdv, 454 struct se_subsystem_dev *se_dev, 455 struct se_hba *hba) 456 __releases(sh->host_lock) 457 { 458 struct se_device *dev; 459 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr; 460 struct Scsi_Host *sh = sd->host; 461 u32 dev_flags = 0; 462 463 if (scsi_device_get(sd)) { 464 pr_err("scsi_device_get() failed for %d:%d:%d:%d\n", 465 sh->host_no, sd->channel, sd->id, sd->lun); 466 spin_unlock_irq(sh->host_lock); 467 return NULL; 468 } 469 spin_unlock_irq(sh->host_lock); 470 471 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); 472 if (!dev) { 473 scsi_device_put(sd); 474 return NULL; 475 } 476 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", 477 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 478 sd->channel, sd->id, sd->lun); 479 480 return dev; 481 } 482 483 /* 484 *Called with struct Scsi_Host->host_lock called. 485 */ 486 static struct se_device *pscsi_create_type_other( 487 struct scsi_device *sd, 488 struct pscsi_dev_virt *pdv, 489 struct se_subsystem_dev *se_dev, 490 struct se_hba *hba) 491 __releases(sh->host_lock) 492 { 493 struct se_device *dev; 494 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr; 495 struct Scsi_Host *sh = sd->host; 496 u32 dev_flags = 0; 497 498 spin_unlock_irq(sh->host_lock); 499 dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags); 500 if (!dev) 501 return NULL; 502 503 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n", 504 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 505 sd->channel, sd->id, sd->lun); 506 507 return dev; 508 } 509 510 static struct se_device *pscsi_create_virtdevice( 511 struct se_hba *hba, 512 struct se_subsystem_dev *se_dev, 513 void *p) 514 { 515 struct pscsi_dev_virt *pdv = p; 516 struct se_device *dev; 517 struct scsi_device *sd; 518 struct pscsi_hba_virt *phv = hba->hba_ptr; 519 struct Scsi_Host *sh = phv->phv_lld_host; 520 int legacy_mode_enable = 0; 521 522 if (!pdv) { 523 pr_err("Unable to locate struct pscsi_dev_virt" 524 " parameter\n"); 525 return ERR_PTR(-EINVAL); 526 } 527 /* 528 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the 529 * struct Scsi_Host we will need to bring the TCM/pSCSI object online 530 */ 531 if (!sh) { 532 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 533 pr_err("pSCSI: Unable to locate struct" 534 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n"); 535 return ERR_PTR(-ENODEV); 536 } 537 /* 538 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device 539 * reference, we enforce that udev_path has been set 540 */ 541 if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) { 542 pr_err("pSCSI: udev_path attribute has not" 543 " been set before ENABLE=1\n"); 544 return ERR_PTR(-EINVAL); 545 } 546 /* 547 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID, 548 * use the original TCM hba ID to reference Linux/SCSI Host No 549 * and enable for PHV_LLD_SCSI_HOST_NO mode. 550 */ 551 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) { 552 spin_lock(&hba->device_lock); 553 if (!list_empty(&hba->hba_dev_list)) { 554 pr_err("pSCSI: Unable to set hba_mode" 555 " with active devices\n"); 556 spin_unlock(&hba->device_lock); 557 return ERR_PTR(-EEXIST); 558 } 559 spin_unlock(&hba->device_lock); 560 561 if (pscsi_pmode_enable_hba(hba, 1) != 1) 562 return ERR_PTR(-ENODEV); 563 564 legacy_mode_enable = 1; 565 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE; 566 sh = phv->phv_lld_host; 567 } else { 568 sh = scsi_host_lookup(pdv->pdv_host_id); 569 if (IS_ERR(sh)) { 570 pr_err("pSCSI: Unable to locate" 571 " pdv_host_id: %d\n", pdv->pdv_host_id); 572 return ERR_CAST(sh); 573 } 574 } 575 } else { 576 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) { 577 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while" 578 " struct Scsi_Host exists\n"); 579 return ERR_PTR(-EEXIST); 580 } 581 } 582 583 spin_lock_irq(sh->host_lock); 584 list_for_each_entry(sd, &sh->__devices, siblings) { 585 if ((pdv->pdv_channel_id != sd->channel) || 586 (pdv->pdv_target_id != sd->id) || 587 (pdv->pdv_lun_id != sd->lun)) 588 continue; 589 /* 590 * Functions will release the held struct scsi_host->host_lock 591 * before calling calling pscsi_add_device_to_list() to register 592 * struct scsi_device with target_core_mod. 593 */ 594 switch (sd->type) { 595 case TYPE_DISK: 596 dev = pscsi_create_type_disk(sd, pdv, se_dev, hba); 597 break; 598 case TYPE_ROM: 599 dev = pscsi_create_type_rom(sd, pdv, se_dev, hba); 600 break; 601 default: 602 dev = pscsi_create_type_other(sd, pdv, se_dev, hba); 603 break; 604 } 605 606 if (!dev) { 607 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 608 scsi_host_put(sh); 609 else if (legacy_mode_enable) { 610 pscsi_pmode_enable_hba(hba, 0); 611 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 612 } 613 pdv->pdv_sd = NULL; 614 return ERR_PTR(-ENODEV); 615 } 616 return dev; 617 } 618 spin_unlock_irq(sh->host_lock); 619 620 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no, 621 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id); 622 623 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 624 scsi_host_put(sh); 625 else if (legacy_mode_enable) { 626 pscsi_pmode_enable_hba(hba, 0); 627 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 628 } 629 630 return ERR_PTR(-ENODEV); 631 } 632 633 /* pscsi_free_device(): (Part of se_subsystem_api_t template) 634 * 635 * 636 */ 637 static void pscsi_free_device(void *p) 638 { 639 struct pscsi_dev_virt *pdv = p; 640 struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr; 641 struct scsi_device *sd = pdv->pdv_sd; 642 643 if (sd) { 644 /* 645 * Release exclusive pSCSI internal struct block_device claim for 646 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk() 647 */ 648 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) { 649 blkdev_put(pdv->pdv_bd, 650 FMODE_WRITE|FMODE_READ|FMODE_EXCL); 651 pdv->pdv_bd = NULL; 652 } 653 /* 654 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference 655 * to struct Scsi_Host now. 656 */ 657 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) && 658 (phv->phv_lld_host != NULL)) 659 scsi_host_put(phv->phv_lld_host); 660 661 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM)) 662 scsi_device_put(sd); 663 664 pdv->pdv_sd = NULL; 665 } 666 667 kfree(pdv); 668 } 669 670 static int pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg) 671 { 672 struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr; 673 struct scsi_device *sd = pdv->pdv_sd; 674 int result; 675 struct pscsi_plugin_task *pt = cmd->priv; 676 unsigned char *cdb = &pt->pscsi_cdb[0]; 677 678 result = pt->pscsi_result; 679 /* 680 * Hack to make sure that Write-Protect modepage is set if R/O mode is 681 * forced. 682 */ 683 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) && 684 (status_byte(result) << 1) == SAM_STAT_GOOD) { 685 if (!cmd->se_deve) 686 goto after_mode_sense; 687 688 if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) { 689 unsigned char *buf = transport_kmap_data_sg(cmd); 690 691 if (cdb[0] == MODE_SENSE_10) { 692 if (!(buf[3] & 0x80)) 693 buf[3] |= 0x80; 694 } else { 695 if (!(buf[2] & 0x80)) 696 buf[2] |= 0x80; 697 } 698 699 transport_kunmap_data_sg(cmd); 700 } 701 } 702 after_mode_sense: 703 704 if (sd->type != TYPE_TAPE) 705 goto after_mode_select; 706 707 /* 708 * Hack to correctly obtain the initiator requested blocksize for 709 * TYPE_TAPE. Since this value is dependent upon each tape media, 710 * struct scsi_device->sector_size will not contain the correct value 711 * by default, so we go ahead and set it so 712 * TRANSPORT(dev)->get_blockdev() returns the correct value to the 713 * storage engine. 714 */ 715 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) && 716 (status_byte(result) << 1) == SAM_STAT_GOOD) { 717 unsigned char *buf; 718 u16 bdl; 719 u32 blocksize; 720 721 buf = sg_virt(&sg[0]); 722 if (!buf) { 723 pr_err("Unable to get buf for scatterlist\n"); 724 goto after_mode_select; 725 } 726 727 if (cdb[0] == MODE_SELECT) 728 bdl = (buf[3]); 729 else 730 bdl = (buf[6] << 8) | (buf[7]); 731 732 if (!bdl) 733 goto after_mode_select; 734 735 if (cdb[0] == MODE_SELECT) 736 blocksize = (buf[9] << 16) | (buf[10] << 8) | 737 (buf[11]); 738 else 739 blocksize = (buf[13] << 16) | (buf[14] << 8) | 740 (buf[15]); 741 742 sd->sector_size = blocksize; 743 } 744 after_mode_select: 745 746 if (status_byte(result) & CHECK_CONDITION) 747 return 1; 748 749 return 0; 750 } 751 752 enum { 753 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id, 754 Opt_scsi_lun_id, Opt_err 755 }; 756 757 static match_table_t tokens = { 758 {Opt_scsi_host_id, "scsi_host_id=%d"}, 759 {Opt_scsi_channel_id, "scsi_channel_id=%d"}, 760 {Opt_scsi_target_id, "scsi_target_id=%d"}, 761 {Opt_scsi_lun_id, "scsi_lun_id=%d"}, 762 {Opt_err, NULL} 763 }; 764 765 static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba, 766 struct se_subsystem_dev *se_dev, 767 const char *page, 768 ssize_t count) 769 { 770 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; 771 struct pscsi_hba_virt *phv = hba->hba_ptr; 772 char *orig, *ptr, *opts; 773 substring_t args[MAX_OPT_ARGS]; 774 int ret = 0, arg, token; 775 776 opts = kstrdup(page, GFP_KERNEL); 777 if (!opts) 778 return -ENOMEM; 779 780 orig = opts; 781 782 while ((ptr = strsep(&opts, ",\n")) != NULL) { 783 if (!*ptr) 784 continue; 785 786 token = match_token(ptr, tokens, args); 787 switch (token) { 788 case Opt_scsi_host_id: 789 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 790 pr_err("PSCSI[%d]: Unable to accept" 791 " scsi_host_id while phv_mode ==" 792 " PHV_LLD_SCSI_HOST_NO\n", 793 phv->phv_host_id); 794 ret = -EINVAL; 795 goto out; 796 } 797 match_int(args, &arg); 798 pdv->pdv_host_id = arg; 799 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:" 800 " %d\n", phv->phv_host_id, pdv->pdv_host_id); 801 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID; 802 break; 803 case Opt_scsi_channel_id: 804 match_int(args, &arg); 805 pdv->pdv_channel_id = arg; 806 pr_debug("PSCSI[%d]: Referencing SCSI Channel" 807 " ID: %d\n", phv->phv_host_id, 808 pdv->pdv_channel_id); 809 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID; 810 break; 811 case Opt_scsi_target_id: 812 match_int(args, &arg); 813 pdv->pdv_target_id = arg; 814 pr_debug("PSCSI[%d]: Referencing SCSI Target" 815 " ID: %d\n", phv->phv_host_id, 816 pdv->pdv_target_id); 817 pdv->pdv_flags |= PDF_HAS_TARGET_ID; 818 break; 819 case Opt_scsi_lun_id: 820 match_int(args, &arg); 821 pdv->pdv_lun_id = arg; 822 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:" 823 " %d\n", phv->phv_host_id, pdv->pdv_lun_id); 824 pdv->pdv_flags |= PDF_HAS_LUN_ID; 825 break; 826 default: 827 break; 828 } 829 } 830 831 out: 832 kfree(orig); 833 return (!ret) ? count : ret; 834 } 835 836 static ssize_t pscsi_check_configfs_dev_params( 837 struct se_hba *hba, 838 struct se_subsystem_dev *se_dev) 839 { 840 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; 841 842 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) || 843 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) || 844 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) { 845 pr_err("Missing scsi_channel_id=, scsi_target_id= and" 846 " scsi_lun_id= parameters\n"); 847 return -EINVAL; 848 } 849 850 return 0; 851 } 852 853 static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba, 854 struct se_subsystem_dev *se_dev, 855 char *b) 856 { 857 struct pscsi_hba_virt *phv = hba->hba_ptr; 858 struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr; 859 struct scsi_device *sd = pdv->pdv_sd; 860 unsigned char host_id[16]; 861 ssize_t bl; 862 int i; 863 864 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 865 snprintf(host_id, 16, "%d", pdv->pdv_host_id); 866 else 867 snprintf(host_id, 16, "PHBA Mode"); 868 869 bl = sprintf(b, "SCSI Device Bus Location:" 870 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n", 871 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id, 872 host_id); 873 874 if (sd) { 875 bl += sprintf(b + bl, " "); 876 bl += sprintf(b + bl, "Vendor: "); 877 for (i = 0; i < 8; i++) { 878 if (ISPRINT(sd->vendor[i])) /* printable character? */ 879 bl += sprintf(b + bl, "%c", sd->vendor[i]); 880 else 881 bl += sprintf(b + bl, " "); 882 } 883 bl += sprintf(b + bl, " Model: "); 884 for (i = 0; i < 16; i++) { 885 if (ISPRINT(sd->model[i])) /* printable character ? */ 886 bl += sprintf(b + bl, "%c", sd->model[i]); 887 else 888 bl += sprintf(b + bl, " "); 889 } 890 bl += sprintf(b + bl, " Rev: "); 891 for (i = 0; i < 4; i++) { 892 if (ISPRINT(sd->rev[i])) /* printable character ? */ 893 bl += sprintf(b + bl, "%c", sd->rev[i]); 894 else 895 bl += sprintf(b + bl, " "); 896 } 897 bl += sprintf(b + bl, "\n"); 898 } 899 return bl; 900 } 901 902 static void pscsi_bi_endio(struct bio *bio, int error) 903 { 904 bio_put(bio); 905 } 906 907 static inline struct bio *pscsi_get_bio(int sg_num) 908 { 909 struct bio *bio; 910 /* 911 * Use bio_malloc() following the comment in for bio -> struct request 912 * in block/blk-core.c:blk_make_request() 913 */ 914 bio = bio_kmalloc(GFP_KERNEL, sg_num); 915 if (!bio) { 916 pr_err("PSCSI: bio_kmalloc() failed\n"); 917 return NULL; 918 } 919 bio->bi_end_io = pscsi_bi_endio; 920 921 return bio; 922 } 923 924 static int pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, 925 u32 sgl_nents, enum dma_data_direction data_direction, 926 struct bio **hbio) 927 { 928 struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr; 929 struct bio *bio = NULL, *tbio = NULL; 930 struct page *page; 931 struct scatterlist *sg; 932 u32 data_len = cmd->data_length, i, len, bytes, off; 933 int nr_pages = (cmd->data_length + sgl[0].offset + 934 PAGE_SIZE - 1) >> PAGE_SHIFT; 935 int nr_vecs = 0, rc; 936 int rw = (data_direction == DMA_TO_DEVICE); 937 938 *hbio = NULL; 939 940 pr_debug("PSCSI: nr_pages: %d\n", nr_pages); 941 942 for_each_sg(sgl, sg, sgl_nents, i) { 943 page = sg_page(sg); 944 off = sg->offset; 945 len = sg->length; 946 947 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i, 948 page, len, off); 949 950 while (len > 0 && data_len > 0) { 951 bytes = min_t(unsigned int, len, PAGE_SIZE - off); 952 bytes = min(bytes, data_len); 953 954 if (!bio) { 955 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages); 956 nr_pages -= nr_vecs; 957 /* 958 * Calls bio_kmalloc() and sets bio->bi_end_io() 959 */ 960 bio = pscsi_get_bio(nr_vecs); 961 if (!bio) 962 goto fail; 963 964 if (rw) 965 bio->bi_rw |= REQ_WRITE; 966 967 pr_debug("PSCSI: Allocated bio: %p," 968 " dir: %s nr_vecs: %d\n", bio, 969 (rw) ? "rw" : "r", nr_vecs); 970 /* 971 * Set *hbio pointer to handle the case: 972 * nr_pages > BIO_MAX_PAGES, where additional 973 * bios need to be added to complete a given 974 * command. 975 */ 976 if (!*hbio) 977 *hbio = tbio = bio; 978 else 979 tbio = tbio->bi_next = bio; 980 } 981 982 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d" 983 " bio: %p page: %p len: %d off: %d\n", i, bio, 984 page, len, off); 985 986 rc = bio_add_pc_page(pdv->pdv_sd->request_queue, 987 bio, page, bytes, off); 988 if (rc != bytes) 989 goto fail; 990 991 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n", 992 bio->bi_vcnt, nr_vecs); 993 994 if (bio->bi_vcnt > nr_vecs) { 995 pr_debug("PSCSI: Reached bio->bi_vcnt max:" 996 " %d i: %d bio: %p, allocating another" 997 " bio\n", bio->bi_vcnt, i, bio); 998 /* 999 * Clear the pointer so that another bio will 1000 * be allocated with pscsi_get_bio() above, the 1001 * current bio has already been set *tbio and 1002 * bio->bi_next. 1003 */ 1004 bio = NULL; 1005 } 1006 1007 page++; 1008 len -= bytes; 1009 data_len -= bytes; 1010 off = 0; 1011 } 1012 } 1013 1014 return sgl_nents; 1015 fail: 1016 while (*hbio) { 1017 bio = *hbio; 1018 *hbio = (*hbio)->bi_next; 1019 bio->bi_next = NULL; 1020 bio_endio(bio, 0); /* XXX: should be error */ 1021 } 1022 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1023 return -ENOMEM; 1024 } 1025 1026 /* 1027 * Clear a lun set in the cdb if the initiator talking to use spoke 1028 * and old standards version, as we can't assume the underlying device 1029 * won't choke up on it. 1030 */ 1031 static inline void pscsi_clear_cdb_lun(unsigned char *cdb) 1032 { 1033 switch (cdb[0]) { 1034 case READ_10: /* SBC - RDProtect */ 1035 case READ_12: /* SBC - RDProtect */ 1036 case READ_16: /* SBC - RDProtect */ 1037 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ 1038 case VERIFY: /* SBC - VRProtect */ 1039 case VERIFY_16: /* SBC - VRProtect */ 1040 case WRITE_VERIFY: /* SBC - VRProtect */ 1041 case WRITE_VERIFY_12: /* SBC - VRProtect */ 1042 case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */ 1043 break; 1044 default: 1045 cdb[1] &= 0x1f; /* clear logical unit number */ 1046 break; 1047 } 1048 } 1049 1050 static int pscsi_parse_cdb(struct se_cmd *cmd) 1051 { 1052 unsigned char *cdb = cmd->t_task_cdb; 1053 unsigned int dummy_size; 1054 int ret; 1055 1056 if (cmd->se_cmd_flags & SCF_BIDI) { 1057 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1058 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 1059 return -EINVAL; 1060 } 1061 1062 pscsi_clear_cdb_lun(cdb); 1063 1064 /* 1065 * For REPORT LUNS we always need to emulate the response, for everything 1066 * else the default for pSCSI is to pass the command to the underlying 1067 * LLD / physical hardware. 1068 */ 1069 switch (cdb[0]) { 1070 case REPORT_LUNS: 1071 ret = spc_parse_cdb(cmd, &dummy_size); 1072 if (ret) 1073 return ret; 1074 break; 1075 case READ_6: 1076 case READ_10: 1077 case READ_12: 1078 case READ_16: 1079 case WRITE_6: 1080 case WRITE_10: 1081 case WRITE_12: 1082 case WRITE_16: 1083 case WRITE_VERIFY: 1084 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1085 /* FALLTHROUGH*/ 1086 default: 1087 cmd->execute_cmd = pscsi_execute_cmd; 1088 break; 1089 } 1090 1091 return 0; 1092 } 1093 1094 static int pscsi_execute_cmd(struct se_cmd *cmd) 1095 { 1096 struct scatterlist *sgl = cmd->t_data_sg; 1097 u32 sgl_nents = cmd->t_data_nents; 1098 enum dma_data_direction data_direction = cmd->data_direction; 1099 struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr; 1100 struct pscsi_plugin_task *pt; 1101 struct request *req; 1102 struct bio *hbio; 1103 int ret; 1104 1105 /* 1106 * Dynamically alloc cdb space, since it may be larger than 1107 * TCM_MAX_COMMAND_SIZE 1108 */ 1109 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL); 1110 if (!pt) { 1111 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1112 return -ENOMEM; 1113 } 1114 cmd->priv = pt; 1115 1116 memcpy(pt->pscsi_cdb, cmd->t_task_cdb, 1117 scsi_command_size(cmd->t_task_cdb)); 1118 1119 if (!sgl) { 1120 req = blk_get_request(pdv->pdv_sd->request_queue, 1121 (data_direction == DMA_TO_DEVICE), 1122 GFP_KERNEL); 1123 if (!req || IS_ERR(req)) { 1124 pr_err("PSCSI: blk_get_request() failed: %ld\n", 1125 req ? IS_ERR(req) : -ENOMEM); 1126 cmd->scsi_sense_reason = 1127 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1128 goto fail; 1129 } 1130 } else { 1131 BUG_ON(!cmd->data_length); 1132 1133 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio); 1134 if (ret < 0) { 1135 cmd->scsi_sense_reason = 1136 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1137 goto fail; 1138 } 1139 1140 req = blk_make_request(pdv->pdv_sd->request_queue, hbio, 1141 GFP_KERNEL); 1142 if (IS_ERR(req)) { 1143 pr_err("pSCSI: blk_make_request() failed\n"); 1144 goto fail_free_bio; 1145 } 1146 } 1147 1148 req->cmd_type = REQ_TYPE_BLOCK_PC; 1149 req->end_io = pscsi_req_done; 1150 req->end_io_data = cmd; 1151 req->cmd_len = scsi_command_size(pt->pscsi_cdb); 1152 req->cmd = &pt->pscsi_cdb[0]; 1153 req->sense = &pt->pscsi_sense[0]; 1154 req->sense_len = 0; 1155 if (pdv->pdv_sd->type == TYPE_DISK) 1156 req->timeout = PS_TIMEOUT_DISK; 1157 else 1158 req->timeout = PS_TIMEOUT_OTHER; 1159 req->retries = PS_RETRY; 1160 1161 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req, 1162 (cmd->sam_task_attr == MSG_HEAD_TAG), 1163 pscsi_req_done); 1164 1165 return 0; 1166 1167 fail_free_bio: 1168 while (hbio) { 1169 struct bio *bio = hbio; 1170 hbio = hbio->bi_next; 1171 bio->bi_next = NULL; 1172 bio_endio(bio, 0); /* XXX: should be error */ 1173 } 1174 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1175 fail: 1176 kfree(pt); 1177 return -ENOMEM; 1178 } 1179 1180 static unsigned char *pscsi_get_sense_buffer(struct se_cmd *cmd) 1181 { 1182 struct pscsi_plugin_task *pt = cmd->priv; 1183 1184 return pt->pscsi_sense; 1185 } 1186 1187 /* pscsi_get_device_rev(): 1188 * 1189 * 1190 */ 1191 static u32 pscsi_get_device_rev(struct se_device *dev) 1192 { 1193 struct pscsi_dev_virt *pdv = dev->dev_ptr; 1194 struct scsi_device *sd = pdv->pdv_sd; 1195 1196 return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1; 1197 } 1198 1199 /* pscsi_get_device_type(): 1200 * 1201 * 1202 */ 1203 static u32 pscsi_get_device_type(struct se_device *dev) 1204 { 1205 struct pscsi_dev_virt *pdv = dev->dev_ptr; 1206 struct scsi_device *sd = pdv->pdv_sd; 1207 1208 return sd->type; 1209 } 1210 1211 static sector_t pscsi_get_blocks(struct se_device *dev) 1212 { 1213 struct pscsi_dev_virt *pdv = dev->dev_ptr; 1214 1215 if (pdv->pdv_bd && pdv->pdv_bd->bd_part) 1216 return pdv->pdv_bd->bd_part->nr_sects; 1217 1218 dump_stack(); 1219 return 0; 1220 } 1221 1222 static void pscsi_req_done(struct request *req, int uptodate) 1223 { 1224 struct se_cmd *cmd = req->end_io_data; 1225 struct pscsi_plugin_task *pt = cmd->priv; 1226 1227 pt->pscsi_result = req->errors; 1228 pt->pscsi_resid = req->resid_len; 1229 1230 cmd->scsi_status = status_byte(pt->pscsi_result) << 1; 1231 if (cmd->scsi_status) { 1232 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:" 1233 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], 1234 pt->pscsi_result); 1235 } 1236 1237 switch (host_byte(pt->pscsi_result)) { 1238 case DID_OK: 1239 target_complete_cmd(cmd, cmd->scsi_status); 1240 break; 1241 default: 1242 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:" 1243 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], 1244 pt->pscsi_result); 1245 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 1246 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 1247 break; 1248 } 1249 1250 __blk_put_request(req->q, req); 1251 kfree(pt); 1252 } 1253 1254 static struct se_subsystem_api pscsi_template = { 1255 .name = "pscsi", 1256 .owner = THIS_MODULE, 1257 .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV, 1258 .attach_hba = pscsi_attach_hba, 1259 .detach_hba = pscsi_detach_hba, 1260 .pmode_enable_hba = pscsi_pmode_enable_hba, 1261 .allocate_virtdevice = pscsi_allocate_virtdevice, 1262 .create_virtdevice = pscsi_create_virtdevice, 1263 .free_device = pscsi_free_device, 1264 .transport_complete = pscsi_transport_complete, 1265 .parse_cdb = pscsi_parse_cdb, 1266 .check_configfs_dev_params = pscsi_check_configfs_dev_params, 1267 .set_configfs_dev_params = pscsi_set_configfs_dev_params, 1268 .show_configfs_dev_params = pscsi_show_configfs_dev_params, 1269 .get_sense_buffer = pscsi_get_sense_buffer, 1270 .get_device_rev = pscsi_get_device_rev, 1271 .get_device_type = pscsi_get_device_type, 1272 .get_blocks = pscsi_get_blocks, 1273 }; 1274 1275 static int __init pscsi_module_init(void) 1276 { 1277 return transport_subsystem_register(&pscsi_template); 1278 } 1279 1280 static void pscsi_module_exit(void) 1281 { 1282 transport_subsystem_release(&pscsi_template); 1283 } 1284 1285 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin"); 1286 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 1287 MODULE_LICENSE("GPL"); 1288 1289 module_init(pscsi_module_init); 1290 module_exit(pscsi_module_exit); 1291