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.port_status == 0)
 242          && ((io->io_hdr.flags & CTL_FLAG_ABORT) == 0)
 243          && ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)) {
 244                 if (io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer > 0) {
 245                         mtx_lock(&be_lun->queue_lock);
 246                         STAILQ_INSERT_TAIL(&be_lun->cont_queue,
 247                             &io->io_hdr, links);
 248                         mtx_unlock(&be_lun->queue_lock);
 249                         taskqueue_enqueue(be_lun->io_taskqueue,
 250                             &be_lun->io_task);
 251                         return (0);
 252                 }
 253                 io->io_hdr.status = CTL_SUCCESS;
 254         } else if ((io->io_hdr.port_status != 0)
 255               && ((io->io_hdr.flags & CTL_FLAG_ABORT) == 0)
 256               && ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)){
 257                 /*
 258                  * For hardware error sense keys, the sense key
 259                  * specific value is defined to be a retry count,
 260                  * but we use it to pass back an internal FETD
 261                  * error code.  XXX KDM  Hopefully the FETD is only
 262                  * using 16 bits for an error code, since that's
 263                  * all the space we have in the sks field.
 264                  */
 265                 ctl_set_internal_failure(&io->scsiio,
 266                                          /*sks_valid*/ 1,
 267                                          /*retry_count*/
 268                                          io->io_hdr.port_status);
 269         }
 270         ctl_data_submit_done(io);
 271         return(0);
 272 }
 273
 274 static int
 275 ctl_backend_ramdisk_submit(union ctl_io *io)
 276 {
 277         struct ctl_be_lun *ctl_be_lun;
 278         struct ctl_lba_len_flags *lbalen;
 279
 280         ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
 281                 CTL_PRIV_BACKEND_LUN].ptr;
 282         lbalen = (struct ctl_lba_len_flags *)&io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN];
 283         if (lbalen->flags & CTL_LLF_VERIFY) {
 284                 ctl_set_success(&io->scsiio);
 285                 ctl_data_submit_done(io);
 286                 return (CTL_RETVAL_COMPLETE);
 287         }
 288         io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer =
 289             lbalen->len * ctl_be_lun->blocksize;
 290         ctl_backend_ramdisk_continue(io);
 291         return (CTL_RETVAL_COMPLETE);
 292 }
 293
 294 static void
 295 ctl_backend_ramdisk_continue(union ctl_io *io)
 296 {
 297         struct ctl_be_ramdisk_softc *softc;
 298         int len, len_filled, sg_filled;
 299 #ifdef CTL_RAMDISK_PAGES
 300         struct ctl_sg_entry *sg_entries;
 301         int i;
 302 #endif
 303
 304         softc = &rd_softc;
 305         len = io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer;
 306 #ifdef CTL_RAMDISK_PAGES
 307         sg_filled = min(btoc(len), softc->num_pages);
 308         if (sg_filled > 1) {
 309                 io->scsiio.kern_data_ptr = malloc(sizeof(struct ctl_sg_entry) *
 310                                                   sg_filled, M_RAMDISK,
 311                                                   M_WAITOK);
 312                 sg_entries = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
 313                 for (i = 0, len_filled = 0; i < sg_filled; i++) {
 314                         sg_entries[i].addr = softc->ramdisk_pages[i];
 315                         sg_entries[i].len = ctl_min(PAGE_SIZE,
 316                                                     len - len_filled);
 317                         len_filled += sg_entries[i].len;
 318                 }
 319                 io->io_hdr.flags |= CTL_FLAG_KDPTR_SGLIST;
 320         } else {
 321                 sg_filled = 0;
 322                 len_filled = len;
 323                 io->scsiio.kern_data_ptr = softc->ramdisk_pages[0];
 324         }
 325 #else
 326         sg_filled = 0;
 327         len_filled = min(len, softc->rd_size);
 328         io->scsiio.kern_data_ptr = softc->ramdisk_buffer;
 329 #endif /* CTL_RAMDISK_PAGES */
 330
 331         io->scsiio.be_move_done = ctl_backend_ramdisk_move_done;
 332         io->scsiio.kern_data_resid = 0;
 333         io->scsiio.kern_data_len = len_filled;
 334         io->scsiio.kern_sg_entries = sg_filled;
 335         io->io_hdr.flags |= CTL_FLAG_ALLOCATED;
 336         io->io_hdr.ctl_private[CTL_PRIV_BACKEND].integer -= len_filled;
 337 #ifdef CTL_TIME_IO
 338         getbintime(&io->io_hdr.dma_start_bt);
 339 #endif
 340         ctl_datamove(io);
 341 }
 342
 343 static void
 344 ctl_backend_ramdisk_worker(void *context, int pending)
 345 {
 346         struct ctl_be_ramdisk_softc *softc;
 347         struct ctl_be_ramdisk_lun *be_lun;
 348         union ctl_io *io;
 349
 350         be_lun = (struct ctl_be_ramdisk_lun *)context;
 351         softc = be_lun->softc;
 352
 353         mtx_lock(&be_lun->queue_lock);
 354         for (;;) {
 355                 io = (union ctl_io *)STAILQ_FIRST(&be_lun->cont_queue);
 356                 if (io != NULL) {
 357                         STAILQ_REMOVE(&be_lun->cont_queue, &io->io_hdr,
 358                                       ctl_io_hdr, links);
 359
 360                         mtx_unlock(&be_lun->queue_lock);
 361
 362                         ctl_backend_ramdisk_continue(io);
 363
 364                         mtx_lock(&be_lun->queue_lock);
 365                         continue;
 366                 }
 367
 368                 /*
 369                  * If we get here, there is no work left in the queues, so
 370                  * just break out and let the task queue go to sleep.
 371                  */
 372                 break;
 373         }
 374         mtx_unlock(&be_lun->queue_lock);
 375 }
 376
 377 static int
 378 ctl_backend_ramdisk_ioctl(struct cdev *dev, u_long cmd, caddr_t addr,
 379                           int flag, struct thread *td)
 380 {
 381         struct ctl_be_ramdisk_softc *softc;
 382         int retval;
 383
 384         retval = 0;
 385         softc = &rd_softc;
 386
 387         switch (cmd) {
 388         case CTL_LUN_REQ: {
 389                 struct ctl_lun_req *lun_req;
 390
 391                 lun_req = (struct ctl_lun_req *)addr;
 392
 393                 switch (lun_req->reqtype) {
 394                 case CTL_LUNREQ_CREATE:
 395                         retval = ctl_backend_ramdisk_create(softc, lun_req,
 396                                                             /*do_wait*/ 1);
 397                         break;
 398                 case CTL_LUNREQ_RM:
 399                         retval = ctl_backend_ramdisk_rm(softc, lun_req);
 400                         break;
 401                 case CTL_LUNREQ_MODIFY:
 402                         retval = ctl_backend_ramdisk_modify(softc, lun_req);
 403                         break;
 404                 default:
 405                         lun_req->status = CTL_LUN_ERROR;
 406                         snprintf(lun_req->error_str, sizeof(lun_req->error_str),
 407                                  "%s: invalid LUN request type %d", __func__,
 408                                  lun_req->reqtype);
 409                         break;
 410                 }
 411                 break;
 412         }
 413         default:
 414                 retval = ENOTTY;
 415                 break;
 416         }
 417
 418         return (retval);
 419 }
 420
 421 static int
 422 ctl_backend_ramdisk_rm(struct ctl_be_ramdisk_softc *softc,
 423                        struct ctl_lun_req *req)
 424 {
 425         struct ctl_be_ramdisk_lun *be_lun;
 426         struct ctl_lun_rm_params *params;
 427         int retval;
 428
 429
 430         retval = 0;
 431         params = &req->reqdata.rm;
 432
 433         be_lun = NULL;
 434
 435         mtx_lock(&softc->lock);
 436
 437         STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
 438                 if (be_lun->ctl_be_lun.lun_id == params->lun_id)
 439                         break;
 440         }
 441         mtx_unlock(&softc->lock);
 442
 443         if (be_lun == NULL) {
 444                 snprintf(req->error_str, sizeof(req->error_str),
 445                          "%s: LUN %u is not managed by the ramdisk backend",
 446                          __func__, params->lun_id);
 447                 goto bailout_error;
 448         }
 449
 450         retval = ctl_disable_lun(&be_lun->ctl_be_lun);
 451
 452         if (retval != 0) {
 453                 snprintf(req->error_str, sizeof(req->error_str),
 454                          "%s: error %d returned from ctl_disable_lun() for "
 455                          "LUN %d", __func__, retval, params->lun_id);
 456                 goto bailout_error;
 457         }
 458
 459         /*
 460          * Set the waiting flag before we invalidate the LUN.  Our shutdown
 461          * routine can be called any time after we invalidate the LUN,
 462          * and can be called from our context.
 463          *
 464          * This tells the shutdown routine that we're waiting, or we're
 465          * going to wait for the shutdown to happen.
 466          */
 467         mtx_lock(&softc->lock);
 468         be_lun->flags |= CTL_BE_RAMDISK_LUN_WAITING;
 469         mtx_unlock(&softc->lock);
 470
 471         retval = ctl_invalidate_lun(&be_lun->ctl_be_lun);
 472         if (retval != 0) {
 473                 snprintf(req->error_str, sizeof(req->error_str),
 474                          "%s: error %d returned from ctl_invalidate_lun() for "
 475                          "LUN %d", __func__, retval, params->lun_id);
 476                 mtx_lock(&softc->lock);
 477                 be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 478                 mtx_unlock(&softc->lock);
 479                 goto bailout_error;
 480         }
 481
 482         mtx_lock(&softc->lock);
 483
 484         while ((be_lun->flags & CTL_BE_RAMDISK_LUN_UNCONFIGURED) == 0) {
 485                 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlram", 0);
 486                 if (retval == EINTR)
 487                         break;
 488         }
 489         be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 490
 491         /*
 492          * We only remove this LUN from the list and free it (below) if
 493          * retval == 0.  If the user interrupted the wait, we just bail out
 494          * without actually freeing the LUN.  We let the shutdown routine
 495          * free the LUN if that happens.
 496          */
 497         if (retval == 0) {
 498                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 499                               links);
 500                 softc->num_luns--;
 501         }
 502
 503         mtx_unlock(&softc->lock);
 504
 505         if (retval == 0) {
 506                 taskqueue_drain(be_lun->io_taskqueue, &be_lun->io_task);
 507                 taskqueue_free(be_lun->io_taskqueue);
 508                 ctl_free_opts(&be_lun->ctl_be_lun.options);
 509                 mtx_destroy(&be_lun->queue_lock);
 510                 free(be_lun, M_RAMDISK);
 511         }
 512
 513         req->status = CTL_LUN_OK;
 514
 515         return (retval);
 516
 517 bailout_error:
 518         req->status = CTL_LUN_ERROR;
 519
 520         return (0);
 521 }
 522
 523 static int
 524 ctl_backend_ramdisk_create(struct ctl_be_ramdisk_softc *softc,
 525                            struct ctl_lun_req *req, int do_wait)
 526 {
 527         struct ctl_be_ramdisk_lun *be_lun;
 528         struct ctl_lun_create_params *params;
 529         uint32_t blocksize;
 530         char *value;
 531         char tmpstr[32];
 532         int retval, unmap;
 533
 534         retval = 0;
 535         params = &req->reqdata.create;
 536         if (params->blocksize_bytes != 0)
 537                 blocksize = params->blocksize_bytes;
 538         else
 539                 blocksize = 512;
 540
 541         be_lun = malloc(sizeof(*be_lun), M_RAMDISK, M_ZERO | (do_wait ?
 542                         M_WAITOK : M_NOWAIT));
 543
 544         if (be_lun == NULL) {
 545                 snprintf(req->error_str, sizeof(req->error_str),
 546                          "%s: error allocating %zd bytes", __func__,
 547                          sizeof(*be_lun));
 548                 goto bailout_error;
 549         }
 550         sprintf(be_lun->lunname, "cram%d", softc->num_luns);
 551         ctl_init_opts(&be_lun->ctl_be_lun.options,
 552             req->num_be_args, req->kern_be_args);
 553
 554         if (params->flags & CTL_LUN_FLAG_DEV_TYPE)
 555                 be_lun->ctl_be_lun.lun_type = params->device_type;
 556         else
 557                 be_lun->ctl_be_lun.lun_type = T_DIRECT;
 558
 559         if (be_lun->ctl_be_lun.lun_type == T_DIRECT) {
 560
 561                 if (params->lun_size_bytes < blocksize) {
 562                         snprintf(req->error_str, sizeof(req->error_str),
 563                                  "%s: LUN size %ju < blocksize %u", __func__,
 564                                  params->lun_size_bytes, blocksize);
 565                         goto bailout_error;
 566                 }
 567
 568                 be_lun->size_blocks = params->lun_size_bytes / blocksize;
 569                 be_lun->size_bytes = be_lun->size_blocks * blocksize;
 570
 571                 be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
 572         } else {
 573                 be_lun->ctl_be_lun.maxlba = 0;
 574                 blocksize = 0;
 575                 be_lun->size_bytes = 0;
 576                 be_lun->size_blocks = 0;
 577         }
 578
 579         be_lun->ctl_be_lun.blocksize = blocksize;
 580
 581         /* Tell the user the blocksize we ended up using */
 582         params->blocksize_bytes = blocksize;
 583
 584         /* Tell the user the exact size we ended up using */
 585         params->lun_size_bytes = be_lun->size_bytes;
 586
 587         be_lun->softc = softc;
 588
 589         unmap = 0;
 590         value = ctl_get_opt(&be_lun->ctl_be_lun.options, "unmap");
 591         if (value != NULL && strcmp(value, "on") == 0)
 592                 unmap = 1;
 593
 594         be_lun->flags = CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 595         be_lun->ctl_be_lun.flags = CTL_LUN_FLAG_PRIMARY;
 596         if (unmap)
 597                 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_UNMAP;
 598         be_lun->ctl_be_lun.be_lun = be_lun;
 599
 600         if (params->flags & CTL_LUN_FLAG_ID_REQ) {
 601                 be_lun->ctl_be_lun.req_lun_id = params->req_lun_id;
 602                 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_ID_REQ;
 603         } else
 604                 be_lun->ctl_be_lun.req_lun_id = 0;
 605
 606         be_lun->ctl_be_lun.lun_shutdown = ctl_backend_ramdisk_lun_shutdown;
 607         be_lun->ctl_be_lun.lun_config_status =
 608                 ctl_backend_ramdisk_lun_config_status;
 609         be_lun->ctl_be_lun.be = &ctl_be_ramdisk_driver;
 610         if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) {
 611                 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d",
 612                          softc->num_luns);
 613                 strncpy((char *)be_lun->ctl_be_lun.serial_num, tmpstr,
 614                         ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
 615                         sizeof(tmpstr)));
 616
 617                 /* Tell the user what we used for a serial number */
 618                 strncpy((char *)params->serial_num, tmpstr,
 619                         ctl_min(sizeof(params->serial_num), sizeof(tmpstr)));
 620         } else {
 621                 strncpy((char *)be_lun->ctl_be_lun.serial_num,
 622                         params->serial_num,
 623                         ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
 624                         sizeof(params->serial_num)));
 625         }
 626         if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) {
 627                 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns);
 628                 strncpy((char *)be_lun->ctl_be_lun.device_id, tmpstr,
 629                         ctl_min(sizeof(be_lun->ctl_be_lun.device_id),
 630                         sizeof(tmpstr)));
 631
 632                 /* Tell the user what we used for a device ID */
 633                 strncpy((char *)params->device_id, tmpstr,
 634                         ctl_min(sizeof(params->device_id), sizeof(tmpstr)));
 635         } else {
 636                 strncpy((char *)be_lun->ctl_be_lun.device_id,
 637                         params->device_id,
 638                         ctl_min(sizeof(be_lun->ctl_be_lun.device_id),
 639                                 sizeof(params->device_id)));
 640         }
 641
 642         STAILQ_INIT(&be_lun->cont_queue);
 643         mtx_init(&be_lun->queue_lock, "cram queue lock", NULL, MTX_DEF);
 644         TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_backend_ramdisk_worker,
 645             be_lun);
 646
 647         be_lun->io_taskqueue = taskqueue_create(be_lun->lunname, M_WAITOK,
 648             taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue);
 649         if (be_lun->io_taskqueue == NULL) {
 650                 snprintf(req->error_str, sizeof(req->error_str),
 651                          "%s: Unable to create taskqueue", __func__);
 652                 goto bailout_error;
 653         }
 654
 655         retval = taskqueue_start_threads(&be_lun->io_taskqueue,
 656                                          /*num threads*/1,
 657                                          /*priority*/PWAIT,
 658                                          /*thread name*/
 659                                          "%s taskq", be_lun->lunname);
 660         if (retval != 0)
 661                 goto bailout_error;
 662
 663         mtx_lock(&softc->lock);
 664         softc->num_luns++;
 665         STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links);
 666
 667         mtx_unlock(&softc->lock);
 668
 669         retval = ctl_add_lun(&be_lun->ctl_be_lun);
 670         if (retval != 0) {
 671                 mtx_lock(&softc->lock);
 672                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 673                               links);
 674                 softc->num_luns--;
 675                 mtx_unlock(&softc->lock);
 676                 snprintf(req->error_str, sizeof(req->error_str),
 677                          "%s: ctl_add_lun() returned error %d, see dmesg for "
 678                         "details", __func__, retval);
 679                 retval = 0;
 680                 goto bailout_error;
 681         }
 682
 683         if (do_wait == 0)
 684                 return (retval);
 685
 686         mtx_lock(&softc->lock);
 687
 688         /*
 689          * Tell the config_status routine that we're waiting so it won't
 690          * clean up the LUN in the event of an error.
 691          */
 692         be_lun->flags |= CTL_BE_RAMDISK_LUN_WAITING;
 693
 694         while (be_lun->flags & CTL_BE_RAMDISK_LUN_UNCONFIGURED) {
 695                 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlram", 0);
 696                 if (retval == EINTR)
 697                         break;
 698         }
 699         be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 700
 701         if (be_lun->flags & CTL_BE_RAMDISK_LUN_CONFIG_ERR) {
 702                 snprintf(req->error_str, sizeof(req->error_str),
 703                          "%s: LUN configuration error, see dmesg for details",
 704                          __func__);
 705                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 706                               links);
 707                 softc->num_luns--;
 708                 mtx_unlock(&softc->lock);
 709                 goto bailout_error;
 710         } else {
 711                 params->req_lun_id = be_lun->ctl_be_lun.lun_id;
 712         }
 713         mtx_unlock(&softc->lock);
 714
 715         req->status = CTL_LUN_OK;
 716
 717         return (retval);
 718
 719 bailout_error:
 720         req->status = CTL_LUN_ERROR;
 721         if (be_lun != NULL) {
 722                 if (be_lun->io_taskqueue != NULL) {
 723                         taskqueue_free(be_lun->io_taskqueue);
 724                 }
 725                 ctl_free_opts(&be_lun->ctl_be_lun.options);
 726                 mtx_destroy(&be_lun->queue_lock);
 727                 free(be_lun, M_RAMDISK);
 728         }
 729
 730         return (retval);
 731 }
 732
 733 static int
 734 ctl_backend_ramdisk_modify(struct ctl_be_ramdisk_softc *softc,
 735                        struct ctl_lun_req *req)
 736 {
 737         struct ctl_be_ramdisk_lun *be_lun;
 738         struct ctl_lun_modify_params *params;
 739         uint32_t blocksize;
 740
 741         params = &req->reqdata.modify;
 742
 743         be_lun = NULL;
 744
 745         mtx_lock(&softc->lock);
 746         STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
 747                 if (be_lun->ctl_be_lun.lun_id == params->lun_id)
 748                         break;
 749         }
 750         mtx_unlock(&softc->lock);
 751
 752         if (be_lun == NULL) {
 753                 snprintf(req->error_str, sizeof(req->error_str),
 754                          "%s: LUN %u is not managed by the ramdisk backend",
 755                          __func__, params->lun_id);
 756                 goto bailout_error;
 757         }
 758
 759         if (params->lun_size_bytes == 0) {
 760                 snprintf(req->error_str, sizeof(req->error_str),
 761                         "%s: LUN size \"auto\" not supported "
 762                         "by the ramdisk backend", __func__);
 763                 goto bailout_error;
 764         }
 765
 766         blocksize = be_lun->ctl_be_lun.blocksize;
 767
 768         if (params->lun_size_bytes < blocksize) {
 769                 snprintf(req->error_str, sizeof(req->error_str),
 770                         "%s: LUN size %ju < blocksize %u", __func__,
 771                         params->lun_size_bytes, blocksize);
 772                 goto bailout_error;
 773         }
 774
 775         be_lun->size_blocks = params->lun_size_bytes / blocksize;
 776         be_lun->size_bytes = be_lun->size_blocks * blocksize;
 777
 778         /*
 779          * The maximum LBA is the size - 1.
 780          *
 781          * XXX: Note that this field is being updated without locking,
 782          *      which might cause problems on 32-bit architectures.
 783          */
 784         be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
 785         ctl_lun_capacity_changed(&be_lun->ctl_be_lun);
 786
 787         /* Tell the user the exact size we ended up using */
 788         params->lun_size_bytes = be_lun->size_bytes;
 789
 790         req->status = CTL_LUN_OK;
 791
 792         return (0);
 793
 794 bailout_error:
 795         req->status = CTL_LUN_ERROR;
 796
 797         return (0);
 798 }
 799
 800 static void
 801 ctl_backend_ramdisk_lun_shutdown(void *be_lun)
 802 {
 803         struct ctl_be_ramdisk_lun *lun;
 804         struct ctl_be_ramdisk_softc *softc;
 805         int do_free;
 806
 807         lun = (struct ctl_be_ramdisk_lun *)be_lun;
 808         softc = lun->softc;
 809         do_free = 0;
 810
 811         mtx_lock(&softc->lock);
 812
 813         lun->flags |= CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 814
 815         if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) {
 816                 wakeup(lun);
 817         } else {
 818                 STAILQ_REMOVE(&softc->lun_list, lun, ctl_be_ramdisk_lun,
 819                               links);
 820                 softc->num_luns--;
 821                 do_free = 1;
 822         }
 823
 824         mtx_unlock(&softc->lock);
 825
 826         if (do_free != 0)
 827                 free(be_lun, M_RAMDISK);
 828 }
 829
 830 static void
 831 ctl_backend_ramdisk_lun_config_status(void *be_lun,
 832                                       ctl_lun_config_status status)
 833 {
 834         struct ctl_be_ramdisk_lun *lun;
 835         struct ctl_be_ramdisk_softc *softc;
 836
 837         lun = (struct ctl_be_ramdisk_lun *)be_lun;
 838         softc = lun->softc;
 839
 840         if (status == CTL_LUN_CONFIG_OK) {
 841                 mtx_lock(&softc->lock);
 842                 lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 843                 if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING)
 844                         wakeup(lun);
 845                 mtx_unlock(&softc->lock);
 846
 847                 /*
 848                  * We successfully added the LUN, attempt to enable it.
 849                  */
 850                 if (ctl_enable_lun(&lun->ctl_be_lun) != 0) {
 851                         printf("%s: ctl_enable_lun() failed!\n", __func__);
 852                         if (ctl_invalidate_lun(&lun->ctl_be_lun) != 0) {
 853                                 printf("%s: ctl_invalidate_lun() failed!\n",
 854                                        __func__);
 855                         }
 856                 }
 857
 858                 return;
 859         }
 860
 861
 862         mtx_lock(&softc->lock);
 863         lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 864
 865         /*
 866          * If we have a user waiting, let him handle the cleanup.  If not,
 867          * clean things up here.
 868          */
 869         if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) {
 870                 lun->flags |= CTL_BE_RAMDISK_LUN_CONFIG_ERR;
 871                 wakeup(lun);
 872         } else {
 873                 STAILQ_REMOVE(&softc->lun_list, lun, ctl_be_ramdisk_lun,
 874                               links);
 875                 softc->num_luns--;
 876                 free(lun, M_RAMDISK);
 877         }
 878         mtx_unlock(&softc->lock);
 879 }
 880
 881 static int
 882 ctl_backend_ramdisk_config_write(union ctl_io *io)
 883 {
 884         struct ctl_be_ramdisk_softc *softc;
 885         int retval;
 886
 887         retval = 0;
 888         softc = &rd_softc;
 889
 890         switch (io->scsiio.cdb[0]) {
 891         case SYNCHRONIZE_CACHE:
 892         case SYNCHRONIZE_CACHE_16:
 893                 /*
 894                  * The upper level CTL code will filter out any CDBs with
 895                  * the immediate bit set and return the proper error.  It
 896                  * will also not allow a sync cache command to go to a LUN
 897                  * that is powered down.
 898                  *
 899                  * We don't really need to worry about what LBA range the
 900                  * user asked to be synced out.  When they issue a sync
 901                  * cache command, we'll sync out the whole thing.
 902                  *
 903                  * This is obviously just a stubbed out implementation.
 904                  * The real implementation will be in the RAIDCore/CTL
 905                  * interface, and can only really happen when RAIDCore
 906                  * implements a per-array cache sync.
 907                  */
 908                 ctl_set_success(&io->scsiio);
 909                 ctl_config_write_done(io);
 910                 break;
 911         case START_STOP_UNIT: {
 912                 struct scsi_start_stop_unit *cdb;
 913                 struct ctl_be_lun *ctl_be_lun;
 914                 struct ctl_be_ramdisk_lun *be_lun;
 915
 916                 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb;
 917
 918                 ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
 919                         CTL_PRIV_BACKEND_LUN].ptr;
 920                 be_lun = (struct ctl_be_ramdisk_lun *)ctl_be_lun->be_lun;
 921
 922                 if (cdb->how & SSS_START)
 923                         retval = ctl_start_lun(ctl_be_lun);
 924                 else {
 925                         retval = ctl_stop_lun(ctl_be_lun);
 926 #ifdef NEEDTOPORT
 927                         if ((retval == 0)
 928                          && (cdb->byte2 & SSS_ONOFFLINE))
 929                                 retval = ctl_lun_offline(ctl_be_lun);
 930 #endif
 931                 }
 932
 933                 /*
 934                  * In general, the above routines should not fail.  They
 935                  * just set state for the LUN.  So we've got something
 936                  * pretty wrong here if we can't start or stop the LUN.
 937                  */
 938                 if (retval != 0) {
 939                         ctl_set_internal_failure(&io->scsiio,
 940                                                  /*sks_valid*/ 1,
 941                                                  /*retry_count*/ 0xf051);
 942                         retval = CTL_RETVAL_COMPLETE;
 943                 } else {
 944                         ctl_set_success(&io->scsiio);
 945                 }
 946                 ctl_config_write_done(io);
 947                 break;
 948         }
 949         case WRITE_SAME_10:
 950         case WRITE_SAME_16:
 951         case UNMAP:
 952                 ctl_set_success(&io->scsiio);
 953                 ctl_config_write_done(io);
 954                 break;
 955         default:
 956                 ctl_set_invalid_opcode(&io->scsiio);
 957                 ctl_config_write_done(io);
 958                 retval = CTL_RETVAL_COMPLETE;
 959                 break;
 960         }
 961
 962         return (retval);
 963 }
 964
 965 static int
 966 ctl_backend_ramdisk_config_read(union ctl_io *io)
 967 {
 968         /*
 969          * XXX KDM need to implement!!
 970          */
 971         return (0);
 972 }