ctl_backend_ramdisk.c revision 312835
1/*- 2 * Copyright (c) 2003, 2008 Silicon Graphics International Corp. 3 * Copyright (c) 2012 The FreeBSD Foundation 4 * Copyright (c) 2014-2015 Alexander Motin <mav@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Portions of this software were developed by Edward Tomasz Napierala 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions, and the following disclaimer, 15 * without modification. 16 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 17 * substantially similar to the "NO WARRANTY" disclaimer below 18 * ("Disclaimer") and any redistribution must be conditioned upon 19 * including a substantially similar Disclaimer requirement for further 20 * binary redistribution. 21 * 22 * NO WARRANTY 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGES. 34 * 35 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend_ramdisk.c#3 $ 36 */ 37/* 38 * CAM Target Layer backend for a "fake" ramdisk. 39 * 40 * Author: Ken Merry <ken@FreeBSD.org> 41 */ 42 43#include <sys/cdefs.h> 44__FBSDID("$FreeBSD: stable/10/sys/cam/ctl/ctl_backend_ramdisk.c 312835 2017-01-26 20:50:01Z mav $"); 45 46#include <sys/param.h> 47#include <sys/systm.h> 48#include <sys/kernel.h> 49#include <sys/condvar.h> 50#include <sys/types.h> 51#include <sys/lock.h> 52#include <sys/mutex.h> 53#include <sys/malloc.h> 54#include <sys/taskqueue.h> 55#include <sys/time.h> 56#include <sys/queue.h> 57#include <sys/conf.h> 58#include <sys/ioccom.h> 59#include <sys/module.h> 60#include <sys/sysctl.h> 61 62#include <cam/scsi/scsi_all.h> 63#include <cam/scsi/scsi_da.h> 64#include <cam/ctl/ctl_io.h> 65#include <cam/ctl/ctl.h> 66#include <cam/ctl/ctl_util.h> 67#include <cam/ctl/ctl_backend.h> 68#include <cam/ctl/ctl_debug.h> 69#include <cam/ctl/ctl_ioctl.h> 70#include <cam/ctl/ctl_ha.h> 71#include <cam/ctl/ctl_private.h> 72#include <cam/ctl/ctl_error.h> 73 74typedef enum { 75 CTL_BE_RAMDISK_LUN_UNCONFIGURED = 0x01, 76 CTL_BE_RAMDISK_LUN_CONFIG_ERR = 0x02, 77 CTL_BE_RAMDISK_LUN_WAITING = 0x04 78} ctl_be_ramdisk_lun_flags; 79 80struct ctl_be_ramdisk_lun { 81 struct ctl_lun_create_params params; 82 char lunname[32]; 83 uint64_t size_bytes; 84 uint64_t size_blocks; 85 struct ctl_be_ramdisk_softc *softc; 86 ctl_be_ramdisk_lun_flags flags; 87 STAILQ_ENTRY(ctl_be_ramdisk_lun) links; 88 struct ctl_be_lun cbe_lun; 89 struct taskqueue *io_taskqueue; 90 struct task io_task; 91 STAILQ_HEAD(, ctl_io_hdr) cont_queue; 92 struct mtx_padalign queue_lock; 93}; 94 95struct ctl_be_ramdisk_softc { 96 struct mtx lock; 97 int rd_size; 98#ifdef CTL_RAMDISK_PAGES 99 uint8_t **ramdisk_pages; 100 int num_pages; 101#else 102 uint8_t *ramdisk_buffer; 103#endif 104 int num_luns; 105 STAILQ_HEAD(, ctl_be_ramdisk_lun) lun_list; 106}; 107 108static struct ctl_be_ramdisk_softc rd_softc; 109extern struct ctl_softc *control_softc; 110 111int ctl_backend_ramdisk_init(void); 112void ctl_backend_ramdisk_shutdown(void); 113static int ctl_backend_ramdisk_move_done(union ctl_io *io); 114static int ctl_backend_ramdisk_submit(union ctl_io *io); 115static void ctl_backend_ramdisk_continue(union ctl_io *io); 116static int ctl_backend_ramdisk_ioctl(struct cdev *dev, u_long cmd, 117 caddr_t addr, int flag, struct thread *td); 118static int ctl_backend_ramdisk_rm(struct ctl_be_ramdisk_softc *softc, 119 struct ctl_lun_req *req); 120static int ctl_backend_ramdisk_create(struct ctl_be_ramdisk_softc *softc, 121 struct ctl_lun_req *req); 122static int ctl_backend_ramdisk_modify(struct ctl_be_ramdisk_softc *softc, 123 struct ctl_lun_req *req); 124static void ctl_backend_ramdisk_worker(void *context, int pending); 125static void ctl_backend_ramdisk_lun_shutdown(void *be_lun); 126static void ctl_backend_ramdisk_lun_config_status(void *be_lun, 127 ctl_lun_config_status status); 128static int ctl_backend_ramdisk_config_write(union ctl_io *io); 129static int ctl_backend_ramdisk_config_read(union ctl_io *io); 130 131static struct ctl_backend_driver ctl_be_ramdisk_driver = 132{ 133 .name = "ramdisk", 134 .flags = CTL_BE_FLAG_HAS_CONFIG, 135 .init = ctl_backend_ramdisk_init, 136 .data_submit = ctl_backend_ramdisk_submit, 137 .data_move_done = ctl_backend_ramdisk_move_done, 138 .config_read = ctl_backend_ramdisk_config_read, 139 .config_write = ctl_backend_ramdisk_config_write, 140 .ioctl = ctl_backend_ramdisk_ioctl 141}; 142 143MALLOC_DEFINE(M_RAMDISK, "ramdisk", "Memory used for CTL RAMdisk"); 144CTL_BACKEND_DECLARE(cbr, ctl_be_ramdisk_driver); 145 146int 147ctl_backend_ramdisk_init(void) 148{ 149 struct ctl_be_ramdisk_softc *softc = &rd_softc; 150#ifdef CTL_RAMDISK_PAGES 151 int i; 152#endif 153 154 memset(softc, 0, sizeof(*softc)); 155 mtx_init(&softc->lock, "ctlramdisk", NULL, MTX_DEF); 156 STAILQ_INIT(&softc->lun_list); 157 softc->rd_size = 1024 * 1024; 158#ifdef CTL_RAMDISK_PAGES 159 softc->num_pages = softc->rd_size / PAGE_SIZE; 160 softc->ramdisk_pages = (uint8_t **)malloc(sizeof(uint8_t *) * 161 softc->num_pages, M_RAMDISK, 162 M_WAITOK); 163 for (i = 0; i < softc->num_pages; i++) 164 softc->ramdisk_pages[i] = malloc(PAGE_SIZE, M_RAMDISK,M_WAITOK); 165#else 166 softc->ramdisk_buffer = (uint8_t *)malloc(softc->rd_size, M_RAMDISK, 167 M_WAITOK); 168#endif 169 170 return (0); 171} 172 173void 174ctl_backend_ramdisk_shutdown(void) 175{ 176 struct ctl_be_ramdisk_softc *softc = &rd_softc; 177 struct ctl_be_ramdisk_lun *lun, *next_lun; 178#ifdef CTL_RAMDISK_PAGES 179 int i; 180#endif 181 182 mtx_lock(&softc->lock); 183 STAILQ_FOREACH_SAFE(lun, &softc->lun_list, links, next_lun) { 184 /* 185 * Drop our lock here. Since ctl_invalidate_lun() can call 186 * back into us, this could potentially lead to a recursive 187 * lock of the same mutex, which would cause a hang. 188 */ 189 mtx_unlock(&softc->lock); 190 ctl_disable_lun(&lun->cbe_lun); 191 ctl_invalidate_lun(&lun->cbe_lun); 192 mtx_lock(&softc->lock); 193 } 194 mtx_unlock(&softc->lock); 195 196#ifdef CTL_RAMDISK_PAGES 197 for (i = 0; i < softc->num_pages; i++) 198 free(softc->ramdisk_pages[i], M_RAMDISK); 199 200 free(softc->ramdisk_pages, M_RAMDISK); 201#else 202 free(softc->ramdisk_buffer, M_RAMDISK); 203#endif 204 205 if (ctl_backend_deregister(&ctl_be_ramdisk_driver) != 0) { 206 printf("ctl_backend_ramdisk_shutdown: " 207 "ctl_backend_deregister() failed!\n"); 208 } 209} 210 211static int 212ctl_backend_ramdisk_move_done(union ctl_io *io) 213{ 214 struct ctl_be_lun *cbe_lun; 215 struct ctl_be_ramdisk_lun *be_lun; 216#ifdef CTL_TIME_IO 217 struct bintime cur_bt; 218#endif 219 220 CTL_DEBUG_PRINT(("ctl_backend_ramdisk_move_done\n")); 221 cbe_lun = CTL_BACKEND_LUN(io); 222 be_lun = (struct ctl_be_ramdisk_lun *)cbe_lun->be_lun; 223#ifdef CTL_TIME_IO 224 getbinuptime(&cur_bt); 225 bintime_sub(&cur_bt, &io->io_hdr.dma_start_bt); 226 bintime_add(&io->io_hdr.dma_bt, &cur_bt); 227#endif 228 io->io_hdr.num_dmas++; 229 if (io->scsiio.kern_sg_entries > 0) 230 free(io->scsiio.kern_data_ptr, M_RAMDISK); 231 io->scsiio.kern_rel_offset += io->scsiio.kern_data_len; 232 if (io->io_hdr.flags & CTL_FLAG_ABORT) { 233 ; 234 } else if ((io->io_hdr.port_status == 0) && 235 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) { 236 if (io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer > 0) { 237 mtx_lock(&be_lun->queue_lock); 238 STAILQ_INSERT_TAIL(&be_lun->cont_queue, 239 &io->io_hdr, links); 240 mtx_unlock(&be_lun->queue_lock); 241 taskqueue_enqueue(be_lun->io_taskqueue, 242 &be_lun->io_task); 243 return (0); 244 } 245 ctl_set_success(&io->scsiio); 246 } else if ((io->io_hdr.port_status != 0) && 247 ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE || 248 (io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS)) { 249 /* 250 * For hardware error sense keys, the sense key 251 * specific value is defined to be a retry count, 252 * but we use it to pass back an internal FETD 253 * error code. XXX KDM Hopefully the FETD is only 254 * using 16 bits for an error code, since that's 255 * all the space we have in the sks field. 256 */ 257 ctl_set_internal_failure(&io->scsiio, 258 /*sks_valid*/ 1, 259 /*retry_count*/ 260 io->io_hdr.port_status); 261 } 262 ctl_data_submit_done(io); 263 return(0); 264} 265 266static int 267ctl_backend_ramdisk_submit(union ctl_io *io) 268{ 269 struct ctl_be_lun *cbe_lun; 270 struct ctl_lba_len_flags *lbalen; 271 272 cbe_lun = CTL_BACKEND_LUN(io); 273 lbalen = (struct ctl_lba_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN]; 274 if (lbalen->flags & CTL_LLF_VERIFY) { 275 ctl_set_success(&io->scsiio); 276 ctl_data_submit_done(io); 277 return (CTL_RETVAL_COMPLETE); 278 } 279 io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer = 280 lbalen->len * cbe_lun->blocksize; 281 ctl_backend_ramdisk_continue(io); 282 return (CTL_RETVAL_COMPLETE); 283} 284 285static void 286ctl_backend_ramdisk_continue(union ctl_io *io) 287{ 288 struct ctl_be_ramdisk_softc *softc; 289 int len, len_filled, sg_filled; 290#ifdef CTL_RAMDISK_PAGES 291 struct ctl_sg_entry *sg_entries; 292 int i; 293#endif 294 295 softc = &rd_softc; 296 len = io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer; 297#ifdef CTL_RAMDISK_PAGES 298 sg_filled = min(btoc(len), softc->num_pages); 299 if (sg_filled > 1) { 300 io->scsiio.kern_data_ptr = malloc(sizeof(struct ctl_sg_entry) * 301 sg_filled, M_RAMDISK, 302 M_WAITOK); 303 sg_entries = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr; 304 for (i = 0, len_filled = 0; i < sg_filled; i++) { 305 sg_entries[i].addr = softc->ramdisk_pages[i]; 306 sg_entries[i].len = MIN(PAGE_SIZE, len - len_filled); 307 len_filled += sg_entries[i].len; 308 } 309 } else { 310 sg_filled = 0; 311 len_filled = len; 312 io->scsiio.kern_data_ptr = softc->ramdisk_pages[0]; 313 } 314#else 315 sg_filled = 0; 316 len_filled = min(len, softc->rd_size); 317 io->scsiio.kern_data_ptr = softc->ramdisk_buffer; 318#endif /* CTL_RAMDISK_PAGES */ 319 320 io->scsiio.be_move_done = ctl_backend_ramdisk_move_done; 321 io->scsiio.kern_data_resid = 0; 322 io->scsiio.kern_data_len = len_filled; 323 io->scsiio.kern_sg_entries = sg_filled; 324 io->io_hdr.flags |= CTL_FLAG_ALLOCATED; 325 io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer -= len_filled; 326#ifdef CTL_TIME_IO 327 getbinuptime(&io->io_hdr.dma_start_bt); 328#endif 329 ctl_datamove(io); 330} 331 332static void 333ctl_backend_ramdisk_worker(void *context, int pending) 334{ 335 struct ctl_be_ramdisk_lun *be_lun; 336 union ctl_io *io; 337 338 be_lun = (struct ctl_be_ramdisk_lun *)context; 339 340 mtx_lock(&be_lun->queue_lock); 341 for (;;) { 342 io = (union ctl_io *)STAILQ_FIRST(&be_lun->cont_queue); 343 if (io != NULL) { 344 STAILQ_REMOVE(&be_lun->cont_queue, &io->io_hdr, 345 ctl_io_hdr, links); 346 mtx_unlock(&be_lun->queue_lock); 347 ctl_backend_ramdisk_continue(io); 348 mtx_lock(&be_lun->queue_lock); 349 continue; 350 } 351 352 /* 353 * If we get here, there is no work left in the queues, so 354 * just break out and let the task queue go to sleep. 355 */ 356 break; 357 } 358 mtx_unlock(&be_lun->queue_lock); 359} 360 361static int 362ctl_backend_ramdisk_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, 363 int flag, struct thread *td) 364{ 365 struct ctl_be_ramdisk_softc *softc = &rd_softc; 366 struct ctl_lun_req *lun_req; 367 int retval; 368 369 retval = 0; 370 switch (cmd) { 371 case CTL_LUN_REQ: 372 lun_req = (struct ctl_lun_req *)addr; 373 switch (lun_req->reqtype) { 374 case CTL_LUNREQ_CREATE: 375 retval = ctl_backend_ramdisk_create(softc, lun_req); 376 break; 377 case CTL_LUNREQ_RM: 378 retval = ctl_backend_ramdisk_rm(softc, lun_req); 379 break; 380 case CTL_LUNREQ_MODIFY: 381 retval = ctl_backend_ramdisk_modify(softc, lun_req); 382 break; 383 default: 384 lun_req->status = CTL_LUN_ERROR; 385 snprintf(lun_req->error_str, sizeof(lun_req->error_str), 386 "%s: invalid LUN request type %d", __func__, 387 lun_req->reqtype); 388 break; 389 } 390 break; 391 default: 392 retval = ENOTTY; 393 break; 394 } 395 396 return (retval); 397} 398 399static int 400ctl_backend_ramdisk_rm(struct ctl_be_ramdisk_softc *softc, 401 struct ctl_lun_req *req) 402{ 403 struct ctl_be_ramdisk_lun *be_lun; 404 struct ctl_lun_rm_params *params; 405 int retval; 406 407 params = &req->reqdata.rm; 408 mtx_lock(&softc->lock); 409 STAILQ_FOREACH(be_lun, &softc->lun_list, links) { 410 if (be_lun->cbe_lun.lun_id == params->lun_id) 411 break; 412 } 413 mtx_unlock(&softc->lock); 414 if (be_lun == NULL) { 415 snprintf(req->error_str, sizeof(req->error_str), 416 "%s: LUN %u is not managed by the ramdisk backend", 417 __func__, params->lun_id); 418 goto bailout_error; 419 } 420 421 retval = ctl_disable_lun(&be_lun->cbe_lun); 422 if (retval != 0) { 423 snprintf(req->error_str, sizeof(req->error_str), 424 "%s: error %d returned from ctl_disable_lun() for " 425 "LUN %d", __func__, retval, params->lun_id); 426 goto bailout_error; 427 } 428 429 /* 430 * Set the waiting flag before we invalidate the LUN. Our shutdown 431 * routine can be called any time after we invalidate the LUN, 432 * and can be called from our context. 433 * 434 * This tells the shutdown routine that we're waiting, or we're 435 * going to wait for the shutdown to happen. 436 */ 437 mtx_lock(&softc->lock); 438 be_lun->flags |= CTL_BE_RAMDISK_LUN_WAITING; 439 mtx_unlock(&softc->lock); 440 441 retval = ctl_invalidate_lun(&be_lun->cbe_lun); 442 if (retval != 0) { 443 snprintf(req->error_str, sizeof(req->error_str), 444 "%s: error %d returned from ctl_invalidate_lun() for " 445 "LUN %d", __func__, retval, params->lun_id); 446 mtx_lock(&softc->lock); 447 be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING; 448 mtx_unlock(&softc->lock); 449 goto bailout_error; 450 } 451 452 mtx_lock(&softc->lock); 453 while ((be_lun->flags & CTL_BE_RAMDISK_LUN_UNCONFIGURED) == 0) { 454 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlram", 0); 455 if (retval == EINTR) 456 break; 457 } 458 be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING; 459 460 /* 461 * We only remove this LUN from the list and free it (below) if 462 * retval == 0. If the user interrupted the wait, we just bail out 463 * without actually freeing the LUN. We let the shutdown routine 464 * free the LUN if that happens. 465 */ 466 if (retval == 0) { 467 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun, 468 links); 469 softc->num_luns--; 470 } 471 472 mtx_unlock(&softc->lock); 473 474 if (retval == 0) { 475 taskqueue_drain_all(be_lun->io_taskqueue); 476 taskqueue_free(be_lun->io_taskqueue); 477 ctl_free_opts(&be_lun->cbe_lun.options); 478 mtx_destroy(&be_lun->queue_lock); 479 free(be_lun, M_RAMDISK); 480 } 481 482 req->status = CTL_LUN_OK; 483 return (retval); 484 485bailout_error: 486 req->status = CTL_LUN_ERROR; 487 return (0); 488} 489 490static int 491ctl_backend_ramdisk_create(struct ctl_be_ramdisk_softc *softc, 492 struct ctl_lun_req *req) 493{ 494 struct ctl_be_ramdisk_lun *be_lun; 495 struct ctl_be_lun *cbe_lun; 496 struct ctl_lun_create_params *params; 497 char *value; 498 char tmpstr[32]; 499 int retval; 500 501 retval = 0; 502 params = &req->reqdata.create; 503 504 be_lun = malloc(sizeof(*be_lun), M_RAMDISK, M_ZERO | M_WAITOK); 505 cbe_lun = &be_lun->cbe_lun; 506 cbe_lun->be_lun = be_lun; 507 be_lun->params = req->reqdata.create; 508 be_lun->softc = softc; 509 sprintf(be_lun->lunname, "cram%d", softc->num_luns); 510 ctl_init_opts(&cbe_lun->options, req->num_be_args, req->kern_be_args); 511 512 if (params->flags & CTL_LUN_FLAG_DEV_TYPE) 513 cbe_lun->lun_type = params->device_type; 514 else 515 cbe_lun->lun_type = T_DIRECT; 516 be_lun->flags = CTL_BE_RAMDISK_LUN_UNCONFIGURED; 517 cbe_lun->flags = 0; 518 value = ctl_get_opt(&cbe_lun->options, "ha_role"); 519 if (value != NULL) { 520 if (strcmp(value, "primary") == 0) 521 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 522 } else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF) 523 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 524 525 if (cbe_lun->lun_type == T_DIRECT || 526 cbe_lun->lun_type == T_CDROM) { 527 if (params->blocksize_bytes != 0) 528 cbe_lun->blocksize = params->blocksize_bytes; 529 else if (cbe_lun->lun_type == T_CDROM) 530 cbe_lun->blocksize = 2048; 531 else 532 cbe_lun->blocksize = 512; 533 if (params->lun_size_bytes < cbe_lun->blocksize) { 534 snprintf(req->error_str, sizeof(req->error_str), 535 "%s: LUN size %ju < blocksize %u", __func__, 536 params->lun_size_bytes, cbe_lun->blocksize); 537 goto bailout_error; 538 } 539 be_lun->size_blocks = params->lun_size_bytes / cbe_lun->blocksize; 540 be_lun->size_bytes = be_lun->size_blocks * cbe_lun->blocksize; 541 cbe_lun->maxlba = be_lun->size_blocks - 1; 542 cbe_lun->atomicblock = UINT32_MAX; 543 cbe_lun->opttxferlen = softc->rd_size / cbe_lun->blocksize; 544 } 545 546 /* Tell the user the blocksize we ended up using */ 547 params->blocksize_bytes = cbe_lun->blocksize; 548 params->lun_size_bytes = be_lun->size_bytes; 549 550 value = ctl_get_opt(&cbe_lun->options, "unmap"); 551 if (value != NULL && strcmp(value, "on") == 0) 552 cbe_lun->flags |= CTL_LUN_FLAG_UNMAP; 553 value = ctl_get_opt(&cbe_lun->options, "readonly"); 554 if (value != NULL) { 555 if (strcmp(value, "on") == 0) 556 cbe_lun->flags |= CTL_LUN_FLAG_READONLY; 557 } else if (cbe_lun->lun_type != T_DIRECT) 558 cbe_lun->flags |= CTL_LUN_FLAG_READONLY; 559 cbe_lun->serseq = CTL_LUN_SERSEQ_OFF; 560 value = ctl_get_opt(&cbe_lun->options, "serseq"); 561 if (value != NULL && strcmp(value, "on") == 0) 562 cbe_lun->serseq = CTL_LUN_SERSEQ_ON; 563 else if (value != NULL && strcmp(value, "read") == 0) 564 cbe_lun->serseq = CTL_LUN_SERSEQ_READ; 565 else if (value != NULL && strcmp(value, "off") == 0) 566 cbe_lun->serseq = CTL_LUN_SERSEQ_OFF; 567 568 if (params->flags & CTL_LUN_FLAG_ID_REQ) { 569 cbe_lun->req_lun_id = params->req_lun_id; 570 cbe_lun->flags |= CTL_LUN_FLAG_ID_REQ; 571 } else 572 cbe_lun->req_lun_id = 0; 573 574 cbe_lun->lun_shutdown = ctl_backend_ramdisk_lun_shutdown; 575 cbe_lun->lun_config_status = ctl_backend_ramdisk_lun_config_status; 576 cbe_lun->be = &ctl_be_ramdisk_driver; 577 if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) { 578 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d", 579 softc->num_luns); 580 strncpy((char *)cbe_lun->serial_num, tmpstr, 581 MIN(sizeof(cbe_lun->serial_num), sizeof(tmpstr))); 582 583 /* Tell the user what we used for a serial number */ 584 strncpy((char *)params->serial_num, tmpstr, 585 MIN(sizeof(params->serial_num), sizeof(tmpstr))); 586 } else { 587 strncpy((char *)cbe_lun->serial_num, params->serial_num, 588 MIN(sizeof(cbe_lun->serial_num), 589 sizeof(params->serial_num))); 590 } 591 if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) { 592 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns); 593 strncpy((char *)cbe_lun->device_id, tmpstr, 594 MIN(sizeof(cbe_lun->device_id), sizeof(tmpstr))); 595 596 /* Tell the user what we used for a device ID */ 597 strncpy((char *)params->device_id, tmpstr, 598 MIN(sizeof(params->device_id), sizeof(tmpstr))); 599 } else { 600 strncpy((char *)cbe_lun->device_id, params->device_id, 601 MIN(sizeof(cbe_lun->device_id), 602 sizeof(params->device_id))); 603 } 604 605 STAILQ_INIT(&be_lun->cont_queue); 606 mtx_init(&be_lun->queue_lock, "cram queue lock", NULL, MTX_DEF); 607 TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_backend_ramdisk_worker, 608 be_lun); 609 610 be_lun->io_taskqueue = taskqueue_create(be_lun->lunname, M_WAITOK, 611 taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue); 612 if (be_lun->io_taskqueue == NULL) { 613 snprintf(req->error_str, sizeof(req->error_str), 614 "%s: Unable to create taskqueue", __func__); 615 goto bailout_error; 616 } 617 618 retval = taskqueue_start_threads(&be_lun->io_taskqueue, 619 /*num threads*/1, 620 /*priority*/PWAIT, 621 /*thread name*/ 622 "%s taskq", be_lun->lunname); 623 if (retval != 0) 624 goto bailout_error; 625 626 mtx_lock(&softc->lock); 627 softc->num_luns++; 628 STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links); 629 mtx_unlock(&softc->lock); 630 631 retval = ctl_add_lun(&be_lun->cbe_lun); 632 if (retval != 0) { 633 mtx_lock(&softc->lock); 634 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun, 635 links); 636 softc->num_luns--; 637 mtx_unlock(&softc->lock); 638 snprintf(req->error_str, sizeof(req->error_str), 639 "%s: ctl_add_lun() returned error %d, see dmesg for " 640 "details", __func__, retval); 641 retval = 0; 642 goto bailout_error; 643 } 644 645 mtx_lock(&softc->lock); 646 647 /* 648 * Tell the config_status routine that we're waiting so it won't 649 * clean up the LUN in the event of an error. 650 */ 651 be_lun->flags |= CTL_BE_RAMDISK_LUN_WAITING; 652 653 while (be_lun->flags & CTL_BE_RAMDISK_LUN_UNCONFIGURED) { 654 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlram", 0); 655 if (retval == EINTR) 656 break; 657 } 658 be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING; 659 660 if (be_lun->flags & CTL_BE_RAMDISK_LUN_CONFIG_ERR) { 661 snprintf(req->error_str, sizeof(req->error_str), 662 "%s: LUN configuration error, see dmesg for details", 663 __func__); 664 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun, 665 links); 666 softc->num_luns--; 667 mtx_unlock(&softc->lock); 668 goto bailout_error; 669 } else { 670 params->req_lun_id = cbe_lun->lun_id; 671 } 672 mtx_unlock(&softc->lock); 673 674 req->status = CTL_LUN_OK; 675 return (retval); 676 677bailout_error: 678 req->status = CTL_LUN_ERROR; 679 if (be_lun != NULL) { 680 if (be_lun->io_taskqueue != NULL) { 681 taskqueue_free(be_lun->io_taskqueue); 682 } 683 ctl_free_opts(&cbe_lun->options); 684 mtx_destroy(&be_lun->queue_lock); 685 free(be_lun, M_RAMDISK); 686 } 687 return (retval); 688} 689 690static int 691ctl_backend_ramdisk_modify(struct ctl_be_ramdisk_softc *softc, 692 struct ctl_lun_req *req) 693{ 694 struct ctl_be_ramdisk_lun *be_lun; 695 struct ctl_be_lun *cbe_lun; 696 struct ctl_lun_modify_params *params; 697 char *value; 698 uint32_t blocksize; 699 int wasprim; 700 701 params = &req->reqdata.modify; 702 703 mtx_lock(&softc->lock); 704 STAILQ_FOREACH(be_lun, &softc->lun_list, links) { 705 if (be_lun->cbe_lun.lun_id == params->lun_id) 706 break; 707 } 708 mtx_unlock(&softc->lock); 709 if (be_lun == NULL) { 710 snprintf(req->error_str, sizeof(req->error_str), 711 "%s: LUN %u is not managed by the ramdisk backend", 712 __func__, params->lun_id); 713 goto bailout_error; 714 } 715 cbe_lun = &be_lun->cbe_lun; 716 717 if (params->lun_size_bytes != 0) 718 be_lun->params.lun_size_bytes = params->lun_size_bytes; 719 ctl_update_opts(&cbe_lun->options, req->num_be_args, req->kern_be_args); 720 721 wasprim = (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY); 722 value = ctl_get_opt(&cbe_lun->options, "ha_role"); 723 if (value != NULL) { 724 if (strcmp(value, "primary") == 0) 725 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 726 else 727 cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY; 728 } else if (control_softc->flags & CTL_FLAG_ACTIVE_SHELF) 729 cbe_lun->flags |= CTL_LUN_FLAG_PRIMARY; 730 else 731 cbe_lun->flags &= ~CTL_LUN_FLAG_PRIMARY; 732 if (wasprim != (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY)) { 733 if (cbe_lun->flags & CTL_LUN_FLAG_PRIMARY) 734 ctl_lun_primary(cbe_lun); 735 else 736 ctl_lun_secondary(cbe_lun); 737 } 738 739 blocksize = be_lun->cbe_lun.blocksize; 740 if (be_lun->params.lun_size_bytes < blocksize) { 741 snprintf(req->error_str, sizeof(req->error_str), 742 "%s: LUN size %ju < blocksize %u", __func__, 743 be_lun->params.lun_size_bytes, blocksize); 744 goto bailout_error; 745 } 746 be_lun->size_blocks = be_lun->params.lun_size_bytes / blocksize; 747 be_lun->size_bytes = be_lun->size_blocks * blocksize; 748 be_lun->cbe_lun.maxlba = be_lun->size_blocks - 1; 749 ctl_lun_capacity_changed(&be_lun->cbe_lun); 750 751 /* Tell the user the exact size we ended up using */ 752 params->lun_size_bytes = be_lun->size_bytes; 753 754 req->status = CTL_LUN_OK; 755 return (0); 756 757bailout_error: 758 req->status = CTL_LUN_ERROR; 759 return (0); 760} 761 762static void 763ctl_backend_ramdisk_lun_shutdown(void *be_lun) 764{ 765 struct ctl_be_ramdisk_lun *lun; 766 struct ctl_be_ramdisk_softc *softc; 767 int do_free; 768 769 lun = (struct ctl_be_ramdisk_lun *)be_lun; 770 softc = lun->softc; 771 do_free = 0; 772 773 mtx_lock(&softc->lock); 774 lun->flags |= CTL_BE_RAMDISK_LUN_UNCONFIGURED; 775 if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) { 776 wakeup(lun); 777 } else { 778 STAILQ_REMOVE(&softc->lun_list, lun, ctl_be_ramdisk_lun, 779 links); 780 softc->num_luns--; 781 do_free = 1; 782 } 783 mtx_unlock(&softc->lock); 784 785 if (do_free != 0) 786 free(be_lun, M_RAMDISK); 787} 788 789static void 790ctl_backend_ramdisk_lun_config_status(void *be_lun, 791 ctl_lun_config_status status) 792{ 793 struct ctl_be_ramdisk_lun *lun; 794 struct ctl_be_ramdisk_softc *softc; 795 796 lun = (struct ctl_be_ramdisk_lun *)be_lun; 797 softc = lun->softc; 798 799 if (status == CTL_LUN_CONFIG_OK) { 800 mtx_lock(&softc->lock); 801 lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED; 802 if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) 803 wakeup(lun); 804 mtx_unlock(&softc->lock); 805 806 /* 807 * We successfully added the LUN, attempt to enable it. 808 */ 809 if (ctl_enable_lun(&lun->cbe_lun) != 0) { 810 printf("%s: ctl_enable_lun() failed!\n", __func__); 811 if (ctl_invalidate_lun(&lun->cbe_lun) != 0) { 812 printf("%s: ctl_invalidate_lun() failed!\n", 813 __func__); 814 } 815 } 816 817 return; 818 } 819 820 821 mtx_lock(&softc->lock); 822 lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED; 823 824 /* 825 * If we have a user waiting, let him handle the cleanup. If not, 826 * clean things up here. 827 */ 828 if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) { 829 lun->flags |= CTL_BE_RAMDISK_LUN_CONFIG_ERR; 830 wakeup(lun); 831 } else { 832 STAILQ_REMOVE(&softc->lun_list, lun, ctl_be_ramdisk_lun, 833 links); 834 softc->num_luns--; 835 free(lun, M_RAMDISK); 836 } 837 mtx_unlock(&softc->lock); 838} 839 840static int 841ctl_backend_ramdisk_config_write(union ctl_io *io) 842{ 843 struct ctl_be_lun *cbe_lun; 844 int retval; 845 846 cbe_lun = CTL_BACKEND_LUN(io); 847 retval = 0; 848 switch (io->scsiio.cdb[0]) { 849 case SYNCHRONIZE_CACHE: 850 case SYNCHRONIZE_CACHE_16: 851 /* 852 * The upper level CTL code will filter out any CDBs with 853 * the immediate bit set and return the proper error. It 854 * will also not allow a sync cache command to go to a LUN 855 * that is powered down. 856 * 857 * We don't really need to worry about what LBA range the 858 * user asked to be synced out. When they issue a sync 859 * cache command, we'll sync out the whole thing. 860 * 861 * This is obviously just a stubbed out implementation. 862 * The real implementation will be in the RAIDCore/CTL 863 * interface, and can only really happen when RAIDCore 864 * implements a per-array cache sync. 865 */ 866 ctl_set_success(&io->scsiio); 867 ctl_config_write_done(io); 868 break; 869 case START_STOP_UNIT: { 870 struct scsi_start_stop_unit *cdb; 871 872 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb; 873 if ((cdb->how & SSS_PC_MASK) != 0) { 874 ctl_set_success(&io->scsiio); 875 ctl_config_write_done(io); 876 break; 877 } 878 if (cdb->how & SSS_START) { 879 if (cdb->how & SSS_LOEJ) 880 ctl_lun_has_media(cbe_lun); 881 ctl_start_lun(cbe_lun); 882 } else { 883 ctl_stop_lun(cbe_lun); 884 if (cdb->how & SSS_LOEJ) 885 ctl_lun_ejected(cbe_lun); 886 } 887 ctl_set_success(&io->scsiio); 888 ctl_config_write_done(io); 889 break; 890 } 891 case PREVENT_ALLOW: 892 case WRITE_SAME_10: 893 case WRITE_SAME_16: 894 case UNMAP: 895 ctl_set_success(&io->scsiio); 896 ctl_config_write_done(io); 897 break; 898 default: 899 ctl_set_invalid_opcode(&io->scsiio); 900 ctl_config_write_done(io); 901 retval = CTL_RETVAL_COMPLETE; 902 break; 903 } 904 905 return (retval); 906} 907 908static int 909ctl_backend_ramdisk_config_read(union ctl_io *io) 910{ 911 int retval = 0; 912 913 switch (io->scsiio.cdb[0]) { 914 case SERVICE_ACTION_IN: 915 if (io->scsiio.cdb[1] == SGLS_SERVICE_ACTION) { 916 /* We have nothing to tell, leave default data. */ 917 ctl_config_read_done(io); 918 retval = CTL_RETVAL_COMPLETE; 919 break; 920 } 921 ctl_set_invalid_field(&io->scsiio, 922 /*sks_valid*/ 1, 923 /*command*/ 1, 924 /*field*/ 1, 925 /*bit_valid*/ 1, 926 /*bit*/ 4); 927 ctl_config_read_done(io); 928 retval = CTL_RETVAL_COMPLETE; 929 break; 930 default: 931 ctl_set_invalid_opcode(&io->scsiio); 932 ctl_config_read_done(io); 933 retval = CTL_RETVAL_COMPLETE; 934 break; 935 } 936 937 return (retval); 938} 939