sys/cam/ctl/ctl_backend_ramdisk.c

   1 /*-
   2  * Copyright (c) 2003, 2008 Silicon Graphics International Corp.
   3  * Copyright (c) 2012 The FreeBSD Foundation
   4  * All rights reserved.
   5  *
   6  * Portions of this software were developed by Edward Tomasz Napierala
   7  * under sponsorship from the FreeBSD Foundation.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions, and the following disclaimer,
  14  *    without modification.
  15  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  16  *    substantially similar to the "NO WARRANTY" disclaimer below
  17  *    ("Disclaimer") and any redistribution must be conditioned upon
  18  *    including a substantially similar Disclaimer requirement for further
  19  *    binary redistribution.
  20  *
  21  * NO WARRANTY
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  25  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  30  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  31  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGES.
  33  *
  34  * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend_ramdisk.c#3 $
  35  */
  36 /*
  37  * CAM Target Layer backend for a "fake" ramdisk.
  38  *
  39  * Author: Ken Merry <ken@FreeBSD.org>
  40  */
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/kernel.h>
  48 #include <sys/condvar.h>
  49 #include <sys/types.h>
  50 #include <sys/lock.h>
  51 #include <sys/mutex.h>
  52 #include <sys/malloc.h>
  53 #include <sys/taskqueue.h>
  54 #include <sys/time.h>
  55 #include <sys/queue.h>
  56 #include <sys/conf.h>
  57 #include <sys/ioccom.h>
  58 #include <sys/module.h>
  59
  60 #include <cam/scsi/scsi_all.h>
  61 #include <cam/ctl/ctl_io.h>
  62 #include <cam/ctl/ctl.h>
  63 #include <cam/ctl/ctl_util.h>
  64 #include <cam/ctl/ctl_backend.h>
  65 #include <cam/ctl/ctl_frontend_internal.h>
  66 #include <cam/ctl/ctl_debug.h>
  67 #include <cam/ctl/ctl_ioctl.h>
  68 #include <cam/ctl/ctl_error.h>
  69
  70 typedef enum {
  71         CTL_BE_RAMDISK_LUN_UNCONFIGURED = 0x01,
  72         CTL_BE_RAMDISK_LUN_CONFIG_ERR   = 0x02,
  73         CTL_BE_RAMDISK_LUN_WAITING      = 0x04
  74 } ctl_be_ramdisk_lun_flags;
  75
  76 struct ctl_be_ramdisk_lun {
  77         char lunname[32];
  78         uint64_t size_bytes;
  79         uint64_t size_blocks;
  80         struct ctl_be_ramdisk_softc *softc;
  81         ctl_be_ramdisk_lun_flags flags;
  82         STAILQ_ENTRY(ctl_be_ramdisk_lun) links;
  83         struct ctl_be_lun ctl_be_lun;
  84         struct taskqueue *io_taskqueue;
  85         struct task io_task;
  86         STAILQ_HEAD(, ctl_io_hdr) cont_queue;
  87         struct mtx_padalign queue_lock;
  88 };
  89
  90 struct ctl_be_ramdisk_softc {
  91         struct mtx lock;
  92         int rd_size;
  93 #ifdef CTL_RAMDISK_PAGES
  94         uint8_t **ramdisk_pages;
  95         int num_pages;
  96 #else
  97         uint8_t *ramdisk_buffer;
  98 #endif
  99         int num_luns;
 100         STAILQ_HEAD(, ctl_be_ramdisk_lun) lun_list;
 101 };
 102
 103 static struct ctl_be_ramdisk_softc rd_softc;
 104
 105 int ctl_backend_ramdisk_init(void);
 106 void ctl_backend_ramdisk_shutdown(void);
 107 static int ctl_backend_ramdisk_move_done(union ctl_io *io);
 108 static int ctl_backend_ramdisk_submit(union ctl_io *io);
 109 static void ctl_backend_ramdisk_continue(union ctl_io *io);
 110 static int ctl_backend_ramdisk_ioctl(struct cdev *dev, u_long cmd,
 111                                      caddr_t addr, int flag, struct thread *td);
 112 static int ctl_backend_ramdisk_rm(struct ctl_be_ramdisk_softc *softc,
 113                                   struct ctl_lun_req *req);
 114 static int ctl_backend_ramdisk_create(struct ctl_be_ramdisk_softc *softc,
 115                                       struct ctl_lun_req *req, int do_wait);
 116 static int ctl_backend_ramdisk_modify(struct ctl_be_ramdisk_softc *softc,
 117                                   struct ctl_lun_req *req);
 118 static void ctl_backend_ramdisk_worker(void *context, int pending);
 119 static void ctl_backend_ramdisk_lun_shutdown(void *be_lun);
 120 static void ctl_backend_ramdisk_lun_config_status(void *be_lun,
 121                                                   ctl_lun_config_status status);
 122 static int ctl_backend_ramdisk_config_write(union ctl_io *io);
 123 static int ctl_backend_ramdisk_config_read(union ctl_io *io);
 124
 125 static struct ctl_backend_driver ctl_be_ramdisk_driver =
 126 {
 127         .name = "ramdisk",
 128         .flags = CTL_BE_FLAG_HAS_CONFIG,
 129         .init = ctl_backend_ramdisk_init,
 130         .data_submit = ctl_backend_ramdisk_submit,
 131         .data_move_done = ctl_backend_ramdisk_move_done,
 132         .config_read = ctl_backend_ramdisk_config_read,
 133         .config_write = ctl_backend_ramdisk_config_write,
 134         .ioctl = ctl_backend_ramdisk_ioctl
 135 };
 136
 137 MALLOC_DEFINE(M_RAMDISK, "ramdisk", "Memory used for CTL RAMdisk");
 138 CTL_BACKEND_DECLARE(cbr, ctl_be_ramdisk_driver);
 139
 140 int
 141 ctl_backend_ramdisk_init(void)
 142 {
 143         struct ctl_be_ramdisk_softc *softc;
 144 #ifdef CTL_RAMDISK_PAGES
 145         int i;
 146 #endif
 147
 148
 149         softc = &rd_softc;
 150
 151         memset(softc, 0, sizeof(*softc));
 152
 153         mtx_init(&softc->lock, "ctlramdisk", NULL, MTX_DEF);
 154
 155         STAILQ_INIT(&softc->lun_list);
 156         softc->rd_size = 1024 * 1024;
 157 #ifdef CTL_RAMDISK_PAGES
 158         softc->num_pages = softc->rd_size / PAGE_SIZE;
 159         softc->ramdisk_pages = (uint8_t **)malloc(sizeof(uint8_t *) *
 160                                                   softc->num_pages, M_RAMDISK,
 161                                                   M_WAITOK);
 162         for (i = 0; i < softc->num_pages; i++)
 163                 softc->ramdisk_pages[i] = malloc(PAGE_SIZE, M_RAMDISK,M_WAITOK);
 164 #else
 165         softc->ramdisk_buffer = (uint8_t *)malloc(softc->rd_size, M_RAMDISK,
 166                                                   M_WAITOK);
 167 #endif
 168
 169         return (0);
 170 }
 171
 172 void
 173 ctl_backend_ramdisk_shutdown(void)
 174 {
 175         struct ctl_be_ramdisk_softc *softc;
 176         struct ctl_be_ramdisk_lun *lun, *next_lun;
 177 #ifdef CTL_RAMDISK_PAGES
 178         int i;
 179 #endif
 180
 181         softc = &rd_softc;
 182
 183         mtx_lock(&softc->lock);
 184         for (lun = STAILQ_FIRST(&softc->lun_list); lun != NULL; lun = next_lun){
 185                 /*
 186                  * Grab the next LUN.  The current LUN may get removed by
 187                  * ctl_invalidate_lun(), which will call our LUN shutdown
 188                  * routine, if there is no outstanding I/O for this LUN.
 189                  */
 190                 next_lun = STAILQ_NEXT(lun, links);
 191
 192                 /*
 193                  * Drop our lock here.  Since ctl_invalidate_lun() can call
 194                  * back into us, this could potentially lead to a recursive
 195                  * lock of the same mutex, which would cause a hang.
 196                  */
 197                 mtx_unlock(&softc->lock);
 198                 ctl_disable_lun(&lun->ctl_be_lun);
 199                 ctl_invalidate_lun(&lun->ctl_be_lun);
 200                 mtx_lock(&softc->lock);
 201         }
 202         mtx_unlock(&softc->lock);
 203
 204 #ifdef CTL_RAMDISK_PAGES
 205         for (i = 0; i < softc->num_pages; i++)
 206                 free(softc->ramdisk_pages[i], M_RAMDISK);
 207
 208         free(softc->ramdisk_pages, M_RAMDISK);
 209 #else
 210         free(softc->ramdisk_buffer, M_RAMDISK);
 211 #endif
 212
 213         if (ctl_backend_deregister(&ctl_be_ramdisk_driver) != 0) {
 214                 printf("ctl_backend_ramdisk_shutdown: "
 215                        "ctl_backend_deregister() failed!\n");
 216         }
 217 }
 218
 219 static int
 220 ctl_backend_ramdisk_move_done(union ctl_io *io)
 221 {
 222         struct ctl_be_lun *ctl_be_lun;
 223         struct ctl_be_ramdisk_lun *be_lun;
 224 #ifdef CTL_TIME_IO
 225         struct bintime cur_bt;
 226 #endif
 227
 228         CTL_DEBUG_PRINT(("ctl_backend_ramdisk_move_done\n"));
 229         ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
 230                 CTL_PRIV_BACKEND_LUN].ptr;
 231         be_lun = (struct ctl_be_ramdisk_lun *)ctl_be_lun->be_lun;
 232 #ifdef CTL_TIME_IO
 233         getbintime(&cur_bt);
 234         bintime_sub(&cur_bt, &io->io_hdr.dma_start_bt);
 235         bintime_add(&io->io_hdr.dma_bt, &cur_bt);
 236         io->io_hdr.num_dmas++;
 237 #endif
 238         if (io->scsiio.kern_sg_entries > 0)
 239                 free(io->scsiio.kern_data_ptr, M_RAMDISK);
 240         io->scsiio.kern_rel_offset += io->scsiio.kern_data_len;
 241         if (io->io_hdr.flags & CTL_FLAG_ABORT) {
 242                 ;
 243         } else if ((io->io_hdr.port_status == 0) &&
 244             ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) {
 245                 if (io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer > 0) {
 246                         mtx_lock(&be_lun->queue_lock);
 247                         STAILQ_INSERT_TAIL(&be_lun->cont_queue,
 248                             &io->io_hdr, links);
 249                         mtx_unlock(&be_lun->queue_lock);
 250                         taskqueue_enqueue(be_lun->io_taskqueue,
 251                             &be_lun->io_task);
 252                         return (0);
 253                 }
 254                 ctl_set_success(&io->scsiio);
 255         } else if ((io->io_hdr.port_status != 0) &&
 256             ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE ||
 257              (io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS)) {
 258                 /*
 259                  * For hardware error sense keys, the sense key
 260                  * specific value is defined to be a retry count,
 261                  * but we use it to pass back an internal FETD
 262                  * error code.  XXX KDM  Hopefully the FETD is only
 263                  * using 16 bits for an error code, since that's
 264                  * all the space we have in the sks field.
 265                  */
 266                 ctl_set_internal_failure(&io->scsiio,
 267                                          /*sks_valid*/ 1,
 268                                          /*retry_count*/
 269                                          io->io_hdr.port_status);
 270         }
 271         ctl_data_submit_done(io);
 272         return(0);
 273 }
 274
 275 static int
 276 ctl_backend_ramdisk_submit(union ctl_io *io)
 277 {
 278         struct ctl_be_lun *ctl_be_lun;
 279         struct ctl_lba_len_flags *lbalen;
 280
 281         ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
 282                 CTL_PRIV_BACKEND_LUN].ptr;
 283         lbalen = (struct ctl_lba_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN];
 284         if (lbalen->flags & CTL_LLF_VERIFY) {
 285                 ctl_set_success(&io->scsiio);
 286                 ctl_data_submit_done(io);
 287                 return (CTL_RETVAL_COMPLETE);
 288         }
 289         io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer =
 290             lbalen->len * ctl_be_lun->blocksize;
 291         ctl_backend_ramdisk_continue(io);
 292         return (CTL_RETVAL_COMPLETE);
 293 }
 294
 295 static void
 296 ctl_backend_ramdisk_continue(union ctl_io *io)
 297 {
 298         struct ctl_be_ramdisk_softc *softc;
 299         int len, len_filled, sg_filled;
 300 #ifdef CTL_RAMDISK_PAGES
 301         struct ctl_sg_entry *sg_entries;
 302         int i;
 303 #endif
 304
 305         softc = &rd_softc;
 306         len = io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer;
 307 #ifdef CTL_RAMDISK_PAGES
 308         sg_filled = min(btoc(len), softc->num_pages);
 309         if (sg_filled > 1) {
 310                 io->scsiio.kern_data_ptr = malloc(sizeof(struct ctl_sg_entry) *
 311                                                   sg_filled, M_RAMDISK,
 312                                                   M_WAITOK);
 313                 sg_entries = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
 314                 for (i = 0, len_filled = 0; i < sg_filled; i++) {
 315                         sg_entries[i].addr = softc->ramdisk_pages[i];
 316                         sg_entries[i].len = ctl_min(PAGE_SIZE,
 317                                                     len - len_filled);
 318                         len_filled += sg_entries[i].len;
 319                 }
 320                 io->io_hdr.flags |= CTL_FLAG_KDPTR_SGLIST;
 321         } else {
 322                 sg_filled = 0;
 323                 len_filled = len;
 324                 io->scsiio.kern_data_ptr = softc->ramdisk_pages[0];
 325         }
 326 #else
 327         sg_filled = 0;
 328         len_filled = min(len, softc->rd_size);
 329         io->scsiio.kern_data_ptr = softc->ramdisk_buffer;
 330 #endif /* CTL_RAMDISK_PAGES */
 331
 332         io->scsiio.be_move_done = ctl_backend_ramdisk_move_done;
 333         io->scsiio.kern_data_resid = 0;
 334         io->scsiio.kern_data_len = len_filled;
 335         io->scsiio.kern_sg_entries = sg_filled;
 336         io->io_hdr.flags |= CTL_FLAG_ALLOCATED;
 337         io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer -= len_filled;
 338 #ifdef CTL_TIME_IO
 339         getbintime(&io->io_hdr.dma_start_bt);
 340 #endif
 341         ctl_datamove(io);
 342 }
 343
 344 static void
 345 ctl_backend_ramdisk_worker(void *context, int pending)
 346 {
 347         struct ctl_be_ramdisk_softc *softc;
 348         struct ctl_be_ramdisk_lun *be_lun;
 349         union ctl_io *io;
 350
 351         be_lun = (struct ctl_be_ramdisk_lun *)context;
 352         softc = be_lun->softc;
 353
 354         mtx_lock(&be_lun->queue_lock);
 355         for (;;) {
 356                 io = (union ctl_io *)STAILQ_FIRST(&be_lun->cont_queue);
 357                 if (io != NULL) {
 358                         STAILQ_REMOVE(&be_lun->cont_queue, &io->io_hdr,
 359                                       ctl_io_hdr, links);
 360
 361                         mtx_unlock(&be_lun->queue_lock);
 362
 363                         ctl_backend_ramdisk_continue(io);
 364
 365                         mtx_lock(&be_lun->queue_lock);
 366                         continue;
 367                 }
 368
 369                 /*
 370                  * If we get here, there is no work left in the queues, so
 371                  * just break out and let the task queue go to sleep.
 372                  */
 373                 break;
 374         }
 375         mtx_unlock(&be_lun->queue_lock);
 376 }
 377
 378 static int
 379 ctl_backend_ramdisk_ioctl(struct cdev *dev, u_long cmd, caddr_t addr,
 380                           int flag, struct thread *td)
 381 {
 382         struct ctl_be_ramdisk_softc *softc;
 383         int retval;
 384
 385         retval = 0;
 386         softc = &rd_softc;
 387
 388         switch (cmd) {
 389         case CTL_LUN_REQ: {
 390                 struct ctl_lun_req *lun_req;
 391
 392                 lun_req = (struct ctl_lun_req *)addr;
 393
 394                 switch (lun_req->reqtype) {
 395                 case CTL_LUNREQ_CREATE:
 396                         retval = ctl_backend_ramdisk_create(softc, lun_req,
 397                                                             /*do_wait*/ 1);
 398                         break;
 399                 case CTL_LUNREQ_RM:
 400                         retval = ctl_backend_ramdisk_rm(softc, lun_req);
 401                         break;
 402                 case CTL_LUNREQ_MODIFY:
 403                         retval = ctl_backend_ramdisk_modify(softc, lun_req);
 404                         break;
 405                 default:
 406                         lun_req->status = CTL_LUN_ERROR;
 407                         snprintf(lun_req->error_str, sizeof(lun_req->error_str),
 408                                  "%s: invalid LUN request type %d", __func__,
 409                                  lun_req->reqtype);
 410                         break;
 411                 }
 412                 break;
 413         }
 414         default:
 415                 retval = ENOTTY;
 416                 break;
 417         }
 418
 419         return (retval);
 420 }
 421
 422 static int
 423 ctl_backend_ramdisk_rm(struct ctl_be_ramdisk_softc *softc,
 424                        struct ctl_lun_req *req)
 425 {
 426         struct ctl_be_ramdisk_lun *be_lun;
 427         struct ctl_lun_rm_params *params;
 428         int retval;
 429
 430
 431         retval = 0;
 432         params = &req->reqdata.rm;
 433
 434         be_lun = NULL;
 435
 436         mtx_lock(&softc->lock);
 437
 438         STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
 439                 if (be_lun->ctl_be_lun.lun_id == params->lun_id)
 440                         break;
 441         }
 442         mtx_unlock(&softc->lock);
 443
 444         if (be_lun == NULL) {
 445                 snprintf(req->error_str, sizeof(req->error_str),
 446                          "%s: LUN %u is not managed by the ramdisk backend",
 447                          __func__, params->lun_id);
 448                 goto bailout_error;
 449         }
 450
 451         retval = ctl_disable_lun(&be_lun->ctl_be_lun);
 452
 453         if (retval != 0) {
 454                 snprintf(req->error_str, sizeof(req->error_str),
 455                          "%s: error %d returned from ctl_disable_lun() for "
 456                          "LUN %d", __func__, retval, params->lun_id);
 457                 goto bailout_error;
 458         }
 459
 460         /*
 461          * Set the waiting flag before we invalidate the LUN.  Our shutdown
 462          * routine can be called any time after we invalidate the LUN,
 463          * and can be called from our context.
 464          *
 465          * This tells the shutdown routine that we're waiting, or we're
 466          * going to wait for the shutdown to happen.
 467          */
 468         mtx_lock(&softc->lock);
 469         be_lun->flags |= CTL_BE_RAMDISK_LUN_WAITING;
 470         mtx_unlock(&softc->lock);
 471
 472         retval = ctl_invalidate_lun(&be_lun->ctl_be_lun);
 473         if (retval != 0) {
 474                 snprintf(req->error_str, sizeof(req->error_str),
 475                          "%s: error %d returned from ctl_invalidate_lun() for "
 476                          "LUN %d", __func__, retval, params->lun_id);
 477                 mtx_lock(&softc->lock);
 478                 be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 479                 mtx_unlock(&softc->lock);
 480                 goto bailout_error;
 481         }
 482
 483         mtx_lock(&softc->lock);
 484
 485         while ((be_lun->flags & CTL_BE_RAMDISK_LUN_UNCONFIGURED) == 0) {
 486                 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlram", 0);
 487                 if (retval == EINTR)
 488                         break;
 489         }
 490         be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 491
 492         /*
 493          * We only remove this LUN from the list and free it (below) if
 494          * retval == 0.  If the user interrupted the wait, we just bail out
 495          * without actually freeing the LUN.  We let the shutdown routine
 496          * free the LUN if that happens.
 497          */
 498         if (retval == 0) {
 499                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 500                               links);
 501                 softc->num_luns--;
 502         }
 503
 504         mtx_unlock(&softc->lock);
 505
 506         if (retval == 0) {
 507                 taskqueue_drain(be_lun->io_taskqueue, &be_lun->io_task);
 508                 taskqueue_free(be_lun->io_taskqueue);
 509                 ctl_free_opts(&be_lun->ctl_be_lun.options);
 510                 mtx_destroy(&be_lun->queue_lock);
 511                 free(be_lun, M_RAMDISK);
 512         }
 513
 514         req->status = CTL_LUN_OK;
 515
 516         return (retval);
 517
 518 bailout_error:
 519         req->status = CTL_LUN_ERROR;
 520
 521         return (0);
 522 }
 523
 524 static int
 525 ctl_backend_ramdisk_create(struct ctl_be_ramdisk_softc *softc,
 526                            struct ctl_lun_req *req, int do_wait)
 527 {
 528         struct ctl_be_ramdisk_lun *be_lun;
 529         struct ctl_lun_create_params *params;
 530         uint32_t blocksize;
 531         char *value;
 532         char tmpstr[32];
 533         int retval, unmap;
 534
 535         retval = 0;
 536         params = &req->reqdata.create;
 537         if (params->blocksize_bytes != 0)
 538                 blocksize = params->blocksize_bytes;
 539         else
 540                 blocksize = 512;
 541
 542         be_lun = malloc(sizeof(*be_lun), M_RAMDISK, M_ZERO | (do_wait ?
 543                         M_WAITOK : M_NOWAIT));
 544
 545         if (be_lun == NULL) {
 546                 snprintf(req->error_str, sizeof(req->error_str),
 547                          "%s: error allocating %zd bytes", __func__,
 548                          sizeof(*be_lun));
 549                 goto bailout_error;
 550         }
 551         sprintf(be_lun->lunname, "cram%d", softc->num_luns);
 552         ctl_init_opts(&be_lun->ctl_be_lun.options,
 553             req->num_be_args, req->kern_be_args);
 554
 555         if (params->flags & CTL_LUN_FLAG_DEV_TYPE)
 556                 be_lun->ctl_be_lun.lun_type = params->device_type;
 557         else
 558                 be_lun->ctl_be_lun.lun_type = T_DIRECT;
 559
 560         if (be_lun->ctl_be_lun.lun_type == T_DIRECT) {
 561
 562                 if (params->lun_size_bytes < blocksize) {
 563                         snprintf(req->error_str, sizeof(req->error_str),
 564                                  "%s: LUN size %ju < blocksize %u", __func__,
 565                                  params->lun_size_bytes, blocksize);
 566                         goto bailout_error;
 567                 }
 568
 569                 be_lun->size_blocks = params->lun_size_bytes / blocksize;
 570                 be_lun->size_bytes = be_lun->size_blocks * blocksize;
 571
 572                 be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
 573         } else {
 574                 be_lun->ctl_be_lun.maxlba = 0;
 575                 blocksize = 0;
 576                 be_lun->size_bytes = 0;
 577                 be_lun->size_blocks = 0;
 578         }
 579
 580         be_lun->ctl_be_lun.blocksize = blocksize;
 581
 582         /* Tell the user the blocksize we ended up using */
 583         params->blocksize_bytes = blocksize;
 584
 585         /* Tell the user the exact size we ended up using */
 586         params->lun_size_bytes = be_lun->size_bytes;
 587
 588         be_lun->softc = softc;
 589
 590         unmap = 0;
 591         value = ctl_get_opt(&be_lun->ctl_be_lun.options, "unmap");
 592         if (value != NULL && strcmp(value, "on") == 0)
 593                 unmap = 1;
 594
 595         be_lun->flags = CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 596         be_lun->ctl_be_lun.flags = CTL_LUN_FLAG_PRIMARY;
 597         if (unmap)
 598                 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_UNMAP;
 599         be_lun->ctl_be_lun.atomicblock = UINT32_MAX;
 600         be_lun->ctl_be_lun.be_lun = be_lun;
 601
 602         if (params->flags & CTL_LUN_FLAG_ID_REQ) {
 603                 be_lun->ctl_be_lun.req_lun_id = params->req_lun_id;
 604                 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_ID_REQ;
 605         } else
 606                 be_lun->ctl_be_lun.req_lun_id = 0;
 607
 608         be_lun->ctl_be_lun.lun_shutdown = ctl_backend_ramdisk_lun_shutdown;
 609         be_lun->ctl_be_lun.lun_config_status =
 610                 ctl_backend_ramdisk_lun_config_status;
 611         be_lun->ctl_be_lun.be = &ctl_be_ramdisk_driver;
 612         if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) {
 613                 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d",
 614                          softc->num_luns);
 615                 strncpy((char *)be_lun->ctl_be_lun.serial_num, tmpstr,
 616                         ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
 617                         sizeof(tmpstr)));
 618
 619                 /* Tell the user what we used for a serial number */
 620                 strncpy((char *)params->serial_num, tmpstr,
 621                         ctl_min(sizeof(params->serial_num), sizeof(tmpstr)));
 622         } else {
 623                 strncpy((char *)be_lun->ctl_be_lun.serial_num,
 624                         params->serial_num,
 625                         ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
 626                         sizeof(params->serial_num)));
 627         }
 628         if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) {
 629                 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns);
 630                 strncpy((char *)be_lun->ctl_be_lun.device_id, tmpstr,
 631                         ctl_min(sizeof(be_lun->ctl_be_lun.device_id),
 632                         sizeof(tmpstr)));
 633
 634                 /* Tell the user what we used for a device ID */
 635                 strncpy((char *)params->device_id, tmpstr,
 636                         ctl_min(sizeof(params->device_id), sizeof(tmpstr)));
 637         } else {
 638                 strncpy((char *)be_lun->ctl_be_lun.device_id,
 639                         params->device_id,
 640                         ctl_min(sizeof(be_lun->ctl_be_lun.device_id),
 641                                 sizeof(params->device_id)));
 642         }
 643
 644         STAILQ_INIT(&be_lun->cont_queue);
 645         mtx_init(&be_lun->queue_lock, "cram queue lock", NULL, MTX_DEF);
 646         TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_backend_ramdisk_worker,
 647             be_lun);
 648
 649         be_lun->io_taskqueue = taskqueue_create(be_lun->lunname, M_WAITOK,
 650             taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue);
 651         if (be_lun->io_taskqueue == NULL) {
 652                 snprintf(req->error_str, sizeof(req->error_str),
 653                          "%s: Unable to create taskqueue", __func__);
 654                 goto bailout_error;
 655         }
 656
 657         retval = taskqueue_start_threads(&be_lun->io_taskqueue,
 658                                          /*num threads*/1,
 659                                          /*priority*/PWAIT,
 660                                          /*thread name*/
 661                                          "%s taskq", be_lun->lunname);
 662         if (retval != 0)
 663                 goto bailout_error;
 664
 665         mtx_lock(&softc->lock);
 666         softc->num_luns++;
 667         STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links);
 668
 669         mtx_unlock(&softc->lock);
 670
 671         retval = ctl_add_lun(&be_lun->ctl_be_lun);
 672         if (retval != 0) {
 673                 mtx_lock(&softc->lock);
 674                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 675                               links);
 676                 softc->num_luns--;
 677                 mtx_unlock(&softc->lock);
 678                 snprintf(req->error_str, sizeof(req->error_str),
 679                          "%s: ctl_add_lun() returned error %d, see dmesg for "
 680                         "details", __func__, retval);
 681                 retval = 0;
 682                 goto bailout_error;
 683         }
 684
 685         if (do_wait == 0)
 686                 return (retval);
 687
 688         mtx_lock(&softc->lock);
 689
 690         /*
 691          * Tell the config_status routine that we're waiting so it won't
 692          * clean up the LUN in the event of an error.
 693          */
 694         be_lun->flags |= CTL_BE_RAMDISK_LUN_WAITING;
 695
 696         while (be_lun->flags & CTL_BE_RAMDISK_LUN_UNCONFIGURED) {
 697                 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlram", 0);
 698                 if (retval == EINTR)
 699                         break;
 700         }
 701         be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 702
 703         if (be_lun->flags & CTL_BE_RAMDISK_LUN_CONFIG_ERR) {
 704                 snprintf(req->error_str, sizeof(req->error_str),
 705                          "%s: LUN configuration error, see dmesg for details",
 706                          __func__);
 707                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 708                               links);
 709                 softc->num_luns--;
 710                 mtx_unlock(&softc->lock);
 711                 goto bailout_error;
 712         } else {
 713                 params->req_lun_id = be_lun->ctl_be_lun.lun_id;
 714         }
 715         mtx_unlock(&softc->lock);
 716
 717         req->status = CTL_LUN_OK;
 718
 719         return (retval);
 720
 721 bailout_error:
 722         req->status = CTL_LUN_ERROR;
 723         if (be_lun != NULL) {
 724                 if (be_lun->io_taskqueue != NULL) {
 725                         taskqueue_free(be_lun->io_taskqueue);
 726                 }
 727                 ctl_free_opts(&be_lun->ctl_be_lun.options);
 728                 mtx_destroy(&be_lun->queue_lock);
 729                 free(be_lun, M_RAMDISK);
 730         }
 731
 732         return (retval);
 733 }
 734
 735 static int
 736 ctl_backend_ramdisk_modify(struct ctl_be_ramdisk_softc *softc,
 737                        struct ctl_lun_req *req)
 738 {
 739         struct ctl_be_ramdisk_lun *be_lun;
 740         struct ctl_lun_modify_params *params;
 741         uint32_t blocksize;
 742
 743         params = &req->reqdata.modify;
 744
 745         be_lun = NULL;
 746
 747         mtx_lock(&softc->lock);
 748         STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
 749                 if (be_lun->ctl_be_lun.lun_id == params->lun_id)
 750                         break;
 751         }
 752         mtx_unlock(&softc->lock);
 753
 754         if (be_lun == NULL) {
 755                 snprintf(req->error_str, sizeof(req->error_str),
 756                          "%s: LUN %u is not managed by the ramdisk backend",
 757                          __func__, params->lun_id);
 758                 goto bailout_error;
 759         }
 760
 761         if (params->lun_size_bytes == 0) {
 762                 snprintf(req->error_str, sizeof(req->error_str),
 763                         "%s: LUN size \"auto\" not supported "
 764                         "by the ramdisk backend", __func__);
 765                 goto bailout_error;
 766         }
 767
 768         blocksize = be_lun->ctl_be_lun.blocksize;
 769
 770         if (params->lun_size_bytes < blocksize) {
 771                 snprintf(req->error_str, sizeof(req->error_str),
 772                         "%s: LUN size %ju < blocksize %u", __func__,
 773                         params->lun_size_bytes, blocksize);
 774                 goto bailout_error;
 775         }
 776
 777         be_lun->size_blocks = params->lun_size_bytes / blocksize;
 778         be_lun->size_bytes = be_lun->size_blocks * blocksize;
 779
 780         /*
 781          * The maximum LBA is the size - 1.
 782          *
 783          * XXX: Note that this field is being updated without locking,
 784          *      which might cause problems on 32-bit architectures.
 785          */
 786         be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
 787         ctl_lun_capacity_changed(&be_lun->ctl_be_lun);
 788
 789         /* Tell the user the exact size we ended up using */
 790         params->lun_size_bytes = be_lun->size_bytes;
 791
 792         req->status = CTL_LUN_OK;
 793
 794         return (0);
 795
 796 bailout_error:
 797         req->status = CTL_LUN_ERROR;
 798
 799         return (0);
 800 }
 801
 802 static void
 803 ctl_backend_ramdisk_lun_shutdown(void *be_lun)
 804 {
 805         struct ctl_be_ramdisk_lun *lun;
 806         struct ctl_be_ramdisk_softc *softc;
 807         int do_free;
 808
 809         lun = (struct ctl_be_ramdisk_lun *)be_lun;
 810         softc = lun->softc;
 811         do_free = 0;
 812
 813         mtx_lock(&softc->lock);
 814
 815         lun->flags |= CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 816
 817         if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) {
 818                 wakeup(lun);
 819         } else {
 820                 STAILQ_REMOVE(&softc->lun_list, lun, ctl_be_ramdisk_lun,
 821                               links);
 822                 softc->num_luns--;
 823                 do_free = 1;
 824         }
 825
 826         mtx_unlock(&softc->lock);
 827
 828         if (do_free != 0)
 829                 free(be_lun, M_RAMDISK);
 830 }
 831
 832 static void
 833 ctl_backend_ramdisk_lun_config_status(void *be_lun,
 834                                       ctl_lun_config_status status)
 835 {
 836         struct ctl_be_ramdisk_lun *lun;
 837         struct ctl_be_ramdisk_softc *softc;
 838
 839         lun = (struct ctl_be_ramdisk_lun *)be_lun;
 840         softc = lun->softc;
 841
 842         if (status == CTL_LUN_CONFIG_OK) {
 843                 mtx_lock(&softc->lock);
 844                 lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 845                 if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING)
 846                         wakeup(lun);
 847                 mtx_unlock(&softc->lock);
 848
 849                 /*
 850                  * We successfully added the LUN, attempt to enable it.
 851                  */
 852                 if (ctl_enable_lun(&lun->ctl_be_lun) != 0) {
 853                         printf("%s: ctl_enable_lun() failed!\n", __func__);
 854                         if (ctl_invalidate_lun(&lun->ctl_be_lun) != 0) {
 855                                 printf("%s: ctl_invalidate_lun() failed!\n",
 856                                        __func__);
 857                         }
 858                 }
 859
 860                 return;
 861         }
 862
 863
 864         mtx_lock(&softc->lock);
 865         lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 866
 867         /*
 868          * If we have a user waiting, let him handle the cleanup.  If not,
 869          * clean things up here.
 870          */
 871         if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) {
 872                 lun->flags |= CTL_BE_RAMDISK_LUN_CONFIG_ERR;
 873                 wakeup(lun);
 874         } else {
 875                 STAILQ_REMOVE(&softc->lun_list, lun, ctl_be_ramdisk_lun,
 876                               links);
 877                 softc->num_luns--;
 878                 free(lun, M_RAMDISK);
 879         }
 880         mtx_unlock(&softc->lock);
 881 }
 882
 883 static int
 884 ctl_backend_ramdisk_config_write(union ctl_io *io)
 885 {
 886         struct ctl_be_ramdisk_softc *softc;
 887         int retval;
 888
 889         retval = 0;
 890         softc = &rd_softc;
 891
 892         switch (io->scsiio.cdb[0]) {
 893         case SYNCHRONIZE_CACHE:
 894         case SYNCHRONIZE_CACHE_16:
 895                 /*
 896                  * The upper level CTL code will filter out any CDBs with
 897                  * the immediate bit set and return the proper error.  It
 898                  * will also not allow a sync cache command to go to a LUN
 899                  * that is powered down.
 900                  *
 901                  * We don't really need to worry about what LBA range the
 902                  * user asked to be synced out.  When they issue a sync
 903                  * cache command, we'll sync out the whole thing.
 904                  *
 905                  * This is obviously just a stubbed out implementation.
 906                  * The real implementation will be in the RAIDCore/CTL
 907                  * interface, and can only really happen when RAIDCore
 908                  * implements a per-array cache sync.
 909                  */
 910                 ctl_set_success(&io->scsiio);
 911                 ctl_config_write_done(io);
 912                 break;
 913         case START_STOP_UNIT: {
 914                 struct scsi_start_stop_unit *cdb;
 915                 struct ctl_be_lun *ctl_be_lun;
 916                 struct ctl_be_ramdisk_lun *be_lun;
 917
 918                 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb;
 919
 920                 ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
 921                         CTL_PRIV_BACKEND_LUN].ptr;
 922                 be_lun = (struct ctl_be_ramdisk_lun *)ctl_be_lun->be_lun;
 923
 924                 if (cdb->how & SSS_START)
 925                         retval = ctl_start_lun(ctl_be_lun);
 926                 else {
 927                         retval = ctl_stop_lun(ctl_be_lun);
 928 #ifdef NEEDTOPORT
 929                         if ((retval == 0)
 930                          && (cdb->byte2 & SSS_ONOFFLINE))
 931                                 retval = ctl_lun_offline(ctl_be_lun);
 932 #endif
 933                 }
 934
 935                 /*
 936                  * In general, the above routines should not fail.  They
 937                  * just set state for the LUN.  So we've got something
 938                  * pretty wrong here if we can't start or stop the LUN.
 939                  */
 940                 if (retval != 0) {
 941                         ctl_set_internal_failure(&io->scsiio,
 942                                                  /*sks_valid*/ 1,
 943                                                  /*retry_count*/ 0xf051);
 944                         retval = CTL_RETVAL_COMPLETE;
 945                 } else {
 946                         ctl_set_success(&io->scsiio);
 947                 }
 948                 ctl_config_write_done(io);
 949                 break;
 950         }
 951         case WRITE_SAME_10:
 952         case WRITE_SAME_16:
 953         case UNMAP:
 954                 ctl_set_success(&io->scsiio);
 955                 ctl_config_write_done(io);
 956                 break;
 957         default:
 958                 ctl_set_invalid_opcode(&io->scsiio);
 959                 ctl_config_write_done(io);
 960                 retval = CTL_RETVAL_COMPLETE;
 961                 break;
 962         }
 963
 964         return (retval);
 965 }
 966
 967 static int
 968 ctl_backend_ramdisk_config_read(union ctl_io *io)
 969 {
 970         /*
 971          * XXX KDM need to implement!!
 972          */
 973         return (0);
 974 }