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);
 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, req);
 552
 553         if (params->flags & CTL_LUN_FLAG_DEV_TYPE)
 554                 be_lun->ctl_be_lun.lun_type = params->device_type;
 555         else
 556                 be_lun->ctl_be_lun.lun_type = T_DIRECT;
 557
 558         if (be_lun->ctl_be_lun.lun_type == T_DIRECT) {
 559
 560                 if (params->lun_size_bytes < blocksize) {
 561                         snprintf(req->error_str, sizeof(req->error_str),
 562                                  "%s: LUN size %ju < blocksize %u", __func__,
 563                                  params->lun_size_bytes, blocksize);
 564                         goto bailout_error;
 565                 }
 566
 567                 be_lun->size_blocks = params->lun_size_bytes / blocksize;
 568                 be_lun->size_bytes = be_lun->size_blocks * blocksize;
 569
 570                 be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
 571         } else {
 572                 be_lun->ctl_be_lun.maxlba = 0;
 573                 blocksize = 0;
 574                 be_lun->size_bytes = 0;
 575                 be_lun->size_blocks = 0;
 576         }
 577
 578         be_lun->ctl_be_lun.blocksize = blocksize;
 579
 580         /* Tell the user the blocksize we ended up using */
 581         params->blocksize_bytes = blocksize;
 582
 583         /* Tell the user the exact size we ended up using */
 584         params->lun_size_bytes = be_lun->size_bytes;
 585
 586         be_lun->softc = softc;
 587
 588         unmap = 0;
 589         value = ctl_get_opt(&be_lun->ctl_be_lun, "unmap");
 590         if (value != NULL && strcmp(value, "on") == 0)
 591                 unmap = 1;
 592
 593         be_lun->flags = CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 594         be_lun->ctl_be_lun.flags = CTL_LUN_FLAG_PRIMARY;
 595         if (unmap)
 596                 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_UNMAP;
 597         be_lun->ctl_be_lun.be_lun = be_lun;
 598
 599         if (params->flags & CTL_LUN_FLAG_ID_REQ) {
 600                 be_lun->ctl_be_lun.req_lun_id = params->req_lun_id;
 601                 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_ID_REQ;
 602         } else
 603                 be_lun->ctl_be_lun.req_lun_id = 0;
 604
 605         be_lun->ctl_be_lun.lun_shutdown = ctl_backend_ramdisk_lun_shutdown;
 606         be_lun->ctl_be_lun.lun_config_status =
 607                 ctl_backend_ramdisk_lun_config_status;
 608         be_lun->ctl_be_lun.be = &ctl_be_ramdisk_driver;
 609         if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) {
 610                 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d",
 611                          softc->num_luns);
 612                 strncpy((char *)be_lun->ctl_be_lun.serial_num, tmpstr,
 613                         ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
 614                         sizeof(tmpstr)));
 615
 616                 /* Tell the user what we used for a serial number */
 617                 strncpy((char *)params->serial_num, tmpstr,
 618                         ctl_min(sizeof(params->serial_num), sizeof(tmpstr)));
 619         } else {
 620                 strncpy((char *)be_lun->ctl_be_lun.serial_num,
 621                         params->serial_num,
 622                         ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
 623                         sizeof(params->serial_num)));
 624         }
 625         if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) {
 626                 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns);
 627                 strncpy((char *)be_lun->ctl_be_lun.device_id, tmpstr,
 628                         ctl_min(sizeof(be_lun->ctl_be_lun.device_id),
 629                         sizeof(tmpstr)));
 630
 631                 /* Tell the user what we used for a device ID */
 632                 strncpy((char *)params->device_id, tmpstr,
 633                         ctl_min(sizeof(params->device_id), sizeof(tmpstr)));
 634         } else {
 635                 strncpy((char *)be_lun->ctl_be_lun.device_id,
 636                         params->device_id,
 637                         ctl_min(sizeof(be_lun->ctl_be_lun.device_id),
 638                                 sizeof(params->device_id)));
 639         }
 640
 641         STAILQ_INIT(&be_lun->cont_queue);
 642         mtx_init(&be_lun->queue_lock, "cram queue lock", NULL, MTX_DEF);
 643         TASK_INIT(&be_lun->io_task, /*priority*/0, ctl_backend_ramdisk_worker,
 644             be_lun);
 645
 646         be_lun->io_taskqueue = taskqueue_create(be_lun->lunname, M_WAITOK,
 647             taskqueue_thread_enqueue, /*context*/&be_lun->io_taskqueue);
 648         if (be_lun->io_taskqueue == NULL) {
 649                 snprintf(req->error_str, sizeof(req->error_str),
 650                          "%s: Unable to create taskqueue", __func__);
 651                 goto bailout_error;
 652         }
 653
 654         retval = taskqueue_start_threads(&be_lun->io_taskqueue,
 655                                          /*num threads*/1,
 656                                          /*priority*/PWAIT,
 657                                          /*thread name*/
 658                                          "%s taskq", be_lun->lunname);
 659         if (retval != 0)
 660                 goto bailout_error;
 661
 662         mtx_lock(&softc->lock);
 663         softc->num_luns++;
 664         STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links);
 665
 666         mtx_unlock(&softc->lock);
 667
 668         retval = ctl_add_lun(&be_lun->ctl_be_lun);
 669         if (retval != 0) {
 670                 mtx_lock(&softc->lock);
 671                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 672                               links);
 673                 softc->num_luns--;
 674                 mtx_unlock(&softc->lock);
 675                 snprintf(req->error_str, sizeof(req->error_str),
 676                          "%s: ctl_add_lun() returned error %d, see dmesg for "
 677                         "details", __func__, retval);
 678                 retval = 0;
 679                 goto bailout_error;
 680         }
 681
 682         if (do_wait == 0)
 683                 return (retval);
 684
 685         mtx_lock(&softc->lock);
 686
 687         /*
 688          * Tell the config_status routine that we're waiting so it won't
 689          * clean up the LUN in the event of an error.
 690          */
 691         be_lun->flags |= CTL_BE_RAMDISK_LUN_WAITING;
 692
 693         while (be_lun->flags & CTL_BE_RAMDISK_LUN_UNCONFIGURED) {
 694                 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlram", 0);
 695                 if (retval == EINTR)
 696                         break;
 697         }
 698         be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 699
 700         if (be_lun->flags & CTL_BE_RAMDISK_LUN_CONFIG_ERR) {
 701                 snprintf(req->error_str, sizeof(req->error_str),
 702                          "%s: LUN configuration error, see dmesg for details",
 703                          __func__);
 704                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 705                               links);
 706                 softc->num_luns--;
 707                 mtx_unlock(&softc->lock);
 708                 goto bailout_error;
 709         } else {
 710                 params->req_lun_id = be_lun->ctl_be_lun.lun_id;
 711         }
 712         mtx_unlock(&softc->lock);
 713
 714         req->status = CTL_LUN_OK;
 715
 716         return (retval);
 717
 718 bailout_error:
 719         req->status = CTL_LUN_ERROR;
 720         if (be_lun != NULL) {
 721                 if (be_lun->io_taskqueue != NULL) {
 722                         taskqueue_free(be_lun->io_taskqueue);
 723                 }
 724                 ctl_free_opts(&be_lun->ctl_be_lun);
 725                 mtx_destroy(&be_lun->queue_lock);
 726                 free(be_lun, M_RAMDISK);
 727         }
 728
 729         return (retval);
 730 }
 731
 732 static int
 733 ctl_backend_ramdisk_modify(struct ctl_be_ramdisk_softc *softc,
 734                        struct ctl_lun_req *req)
 735 {
 736         struct ctl_be_ramdisk_lun *be_lun;
 737         struct ctl_lun_modify_params *params;
 738         uint32_t blocksize;
 739
 740         params = &req->reqdata.modify;
 741
 742         be_lun = NULL;
 743
 744         mtx_lock(&softc->lock);
 745         STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
 746                 if (be_lun->ctl_be_lun.lun_id == params->lun_id)
 747                         break;
 748         }
 749         mtx_unlock(&softc->lock);
 750
 751         if (be_lun == NULL) {
 752                 snprintf(req->error_str, sizeof(req->error_str),
 753                          "%s: LUN %u is not managed by the ramdisk backend",
 754                          __func__, params->lun_id);
 755                 goto bailout_error;
 756         }
 757
 758         if (params->lun_size_bytes == 0) {
 759                 snprintf(req->error_str, sizeof(req->error_str),
 760                         "%s: LUN size \"auto\" not supported "
 761                         "by the ramdisk backend", __func__);
 762                 goto bailout_error;
 763         }
 764
 765         blocksize = be_lun->ctl_be_lun.blocksize;
 766
 767         if (params->lun_size_bytes < blocksize) {
 768                 snprintf(req->error_str, sizeof(req->error_str),
 769                         "%s: LUN size %ju < blocksize %u", __func__,
 770                         params->lun_size_bytes, blocksize);
 771                 goto bailout_error;
 772         }
 773
 774         be_lun->size_blocks = params->lun_size_bytes / blocksize;
 775         be_lun->size_bytes = be_lun->size_blocks * blocksize;
 776
 777         /*
 778          * The maximum LBA is the size - 1.
 779          *
 780          * XXX: Note that this field is being updated without locking,
 781          *      which might cause problems on 32-bit architectures.
 782          */
 783         be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
 784         ctl_lun_capacity_changed(&be_lun->ctl_be_lun);
 785
 786         /* Tell the user the exact size we ended up using */
 787         params->lun_size_bytes = be_lun->size_bytes;
 788
 789         req->status = CTL_LUN_OK;
 790
 791         return (0);
 792
 793 bailout_error:
 794         req->status = CTL_LUN_ERROR;
 795
 796         return (0);
 797 }
 798
 799 static void
 800 ctl_backend_ramdisk_lun_shutdown(void *be_lun)
 801 {
 802         struct ctl_be_ramdisk_lun *lun;
 803         struct ctl_be_ramdisk_softc *softc;
 804         int do_free;
 805
 806         lun = (struct ctl_be_ramdisk_lun *)be_lun;
 807         softc = lun->softc;
 808         do_free = 0;
 809
 810         mtx_lock(&softc->lock);
 811
 812         lun->flags |= CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 813
 814         if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) {
 815                 wakeup(lun);
 816         } else {
 817                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 818                               links);
 819                 softc->num_luns--;
 820                 do_free = 1;
 821         }
 822
 823         mtx_unlock(&softc->lock);
 824
 825         if (do_free != 0)
 826                 free(be_lun, M_RAMDISK);
 827 }
 828
 829 static void
 830 ctl_backend_ramdisk_lun_config_status(void *be_lun,
 831                                       ctl_lun_config_status status)
 832 {
 833         struct ctl_be_ramdisk_lun *lun;
 834         struct ctl_be_ramdisk_softc *softc;
 835
 836         lun = (struct ctl_be_ramdisk_lun *)be_lun;
 837         softc = lun->softc;
 838
 839         if (status == CTL_LUN_CONFIG_OK) {
 840                 mtx_lock(&softc->lock);
 841                 lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 842                 if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING)
 843                         wakeup(lun);
 844                 mtx_unlock(&softc->lock);
 845
 846                 /*
 847                  * We successfully added the LUN, attempt to enable it.
 848                  */
 849                 if (ctl_enable_lun(&lun->ctl_be_lun) != 0) {
 850                         printf("%s: ctl_enable_lun() failed!\n", __func__);
 851                         if (ctl_invalidate_lun(&lun->ctl_be_lun) != 0) {
 852                                 printf("%s: ctl_invalidate_lun() failed!\n",
 853                                        __func__);
 854                         }
 855                 }
 856
 857                 return;
 858         }
 859
 860
 861         mtx_lock(&softc->lock);
 862         lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 863
 864         /*
 865          * If we have a user waiting, let him handle the cleanup.  If not,
 866          * clean things up here.
 867          */
 868         if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) {
 869                 lun->flags |= CTL_BE_RAMDISK_LUN_CONFIG_ERR;
 870                 wakeup(lun);
 871         } else {
 872                 STAILQ_REMOVE(&softc->lun_list, lun, ctl_be_ramdisk_lun,
 873                               links);
 874                 softc->num_luns--;
 875                 free(lun, M_RAMDISK);
 876         }
 877         mtx_unlock(&softc->lock);
 878 }
 879
 880 static int
 881 ctl_backend_ramdisk_config_write(union ctl_io *io)
 882 {
 883         struct ctl_be_ramdisk_softc *softc;
 884         int retval;
 885
 886         retval = 0;
 887         softc = &rd_softc;
 888
 889         switch (io->scsiio.cdb[0]) {
 890         case SYNCHRONIZE_CACHE:
 891         case SYNCHRONIZE_CACHE_16:
 892                 /*
 893                  * The upper level CTL code will filter out any CDBs with
 894                  * the immediate bit set and return the proper error.  It
 895                  * will also not allow a sync cache command to go to a LUN
 896                  * that is powered down.
 897                  *
 898                  * We don't really need to worry about what LBA range the
 899                  * user asked to be synced out.  When they issue a sync
 900                  * cache command, we'll sync out the whole thing.
 901                  *
 902                  * This is obviously just a stubbed out implementation.
 903                  * The real implementation will be in the RAIDCore/CTL
 904                  * interface, and can only really happen when RAIDCore
 905                  * implements a per-array cache sync.
 906                  */
 907                 ctl_set_success(&io->scsiio);
 908                 ctl_config_write_done(io);
 909                 break;
 910         case START_STOP_UNIT: {
 911                 struct scsi_start_stop_unit *cdb;
 912                 struct ctl_be_lun *ctl_be_lun;
 913                 struct ctl_be_ramdisk_lun *be_lun;
 914
 915                 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb;
 916
 917                 ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
 918                         CTL_PRIV_BACKEND_LUN].ptr;
 919                 be_lun = (struct ctl_be_ramdisk_lun *)ctl_be_lun->be_lun;
 920
 921                 if (cdb->how & SSS_START)
 922                         retval = ctl_start_lun(ctl_be_lun);
 923                 else {
 924                         retval = ctl_stop_lun(ctl_be_lun);
 925 #ifdef NEEDTOPORT
 926                         if ((retval == 0)
 927                          && (cdb->byte2 & SSS_ONOFFLINE))
 928                                 retval = ctl_lun_offline(ctl_be_lun);
 929 #endif
 930                 }
 931
 932                 /*
 933                  * In general, the above routines should not fail.  They
 934                  * just set state for the LUN.  So we've got something
 935                  * pretty wrong here if we can't start or stop the LUN.
 936                  */
 937                 if (retval != 0) {
 938                         ctl_set_internal_failure(&io->scsiio,
 939                                                  /*sks_valid*/ 1,
 940                                                  /*retry_count*/ 0xf051);
 941                         retval = CTL_RETVAL_COMPLETE;
 942                 } else {
 943                         ctl_set_success(&io->scsiio);
 944                 }
 945                 ctl_config_write_done(io);
 946                 break;
 947         }
 948         case WRITE_SAME_10:
 949         case WRITE_SAME_16:
 950         case UNMAP:
 951                 ctl_set_success(&io->scsiio);
 952                 ctl_config_write_done(io);
 953                 break;
 954         default:
 955                 ctl_set_invalid_opcode(&io->scsiio);
 956                 ctl_config_write_done(io);
 957                 retval = CTL_RETVAL_COMPLETE;
 958                 break;
 959         }
 960
 961         return (retval);
 962 }
 963
 964 static int
 965 ctl_backend_ramdisk_config_read(union ctl_io *io)
 966 {
 967         /*
 968          * XXX KDM need to implement!!
 969          */
 970         return (0);
 971 }