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/time.h>
  54 #include <sys/queue.h>
  55 #include <sys/conf.h>
  56 #include <sys/ioccom.h>
  57 #include <sys/module.h>
  58
  59 #include <cam/scsi/scsi_all.h>
  60 #include <cam/ctl/ctl_io.h>
  61 #include <cam/ctl/ctl.h>
  62 #include <cam/ctl/ctl_util.h>
  63 #include <cam/ctl/ctl_backend.h>
  64 #include <cam/ctl/ctl_frontend_internal.h>
  65 #include <cam/ctl/ctl_debug.h>
  66 #include <cam/ctl/ctl_ioctl.h>
  67 #include <cam/ctl/ctl_error.h>
  68
  69 typedef enum {
  70         CTL_BE_RAMDISK_LUN_UNCONFIGURED = 0x01,
  71         CTL_BE_RAMDISK_LUN_CONFIG_ERR   = 0x02,
  72         CTL_BE_RAMDISK_LUN_WAITING      = 0x04
  73 } ctl_be_ramdisk_lun_flags;
  74
  75 struct ctl_be_ramdisk_lun {
  76         uint64_t size_bytes;
  77         uint64_t size_blocks;
  78         struct ctl_be_ramdisk_softc *softc;
  79         ctl_be_ramdisk_lun_flags flags;
  80         STAILQ_ENTRY(ctl_be_ramdisk_lun) links;
  81         struct ctl_be_lun ctl_be_lun;
  82 };
  83
  84 struct ctl_be_ramdisk_softc {
  85         struct mtx lock;
  86         int rd_size;
  87 #ifdef CTL_RAMDISK_PAGES
  88         uint8_t **ramdisk_pages;
  89         int num_pages;
  90 #else
  91         uint8_t *ramdisk_buffer;
  92 #endif
  93         int num_luns;
  94         STAILQ_HEAD(, ctl_be_ramdisk_lun) lun_list;
  95 };
  96
  97 static struct ctl_be_ramdisk_softc rd_softc;
  98
  99 int ctl_backend_ramdisk_init(void);
 100 void ctl_backend_ramdisk_shutdown(void);
 101 static int ctl_backend_ramdisk_move_done(union ctl_io *io);
 102 static int ctl_backend_ramdisk_submit(union ctl_io *io);
 103 static int ctl_backend_ramdisk_ioctl(struct cdev *dev, u_long cmd,
 104                                      caddr_t addr, int flag, struct thread *td);
 105 static int ctl_backend_ramdisk_rm(struct ctl_be_ramdisk_softc *softc,
 106                                   struct ctl_lun_req *req);
 107 static int ctl_backend_ramdisk_create(struct ctl_be_ramdisk_softc *softc,
 108                                       struct ctl_lun_req *req, int do_wait);
 109 static int ctl_backend_ramdisk_modify(struct ctl_be_ramdisk_softc *softc,
 110                                   struct ctl_lun_req *req);
 111 static void ctl_backend_ramdisk_lun_shutdown(void *be_lun);
 112 static void ctl_backend_ramdisk_lun_config_status(void *be_lun,
 113                                                   ctl_lun_config_status status);
 114 static int ctl_backend_ramdisk_config_write(union ctl_io *io);
 115 static int ctl_backend_ramdisk_config_read(union ctl_io *io);
 116
 117 static struct ctl_backend_driver ctl_be_ramdisk_driver =
 118 {
 119         .name = "ramdisk",
 120         .flags = CTL_BE_FLAG_HAS_CONFIG,
 121         .init = ctl_backend_ramdisk_init,
 122         .data_submit = ctl_backend_ramdisk_submit,
 123         .data_move_done = ctl_backend_ramdisk_move_done,
 124         .config_read = ctl_backend_ramdisk_config_read,
 125         .config_write = ctl_backend_ramdisk_config_write,
 126         .ioctl = ctl_backend_ramdisk_ioctl
 127 };
 128
 129 MALLOC_DEFINE(M_RAMDISK, "ramdisk", "Memory used for CTL RAMdisk");
 130 CTL_BACKEND_DECLARE(cbr, ctl_be_ramdisk_driver);
 131
 132 int
 133 ctl_backend_ramdisk_init(void)
 134 {
 135         struct ctl_be_ramdisk_softc *softc;
 136 #ifdef CTL_RAMDISK_PAGES
 137         int i;
 138 #endif
 139
 140
 141         softc = &rd_softc;
 142
 143         memset(softc, 0, sizeof(*softc));
 144
 145         mtx_init(&softc->lock, "ramdisk", NULL, MTX_DEF);
 146
 147         STAILQ_INIT(&softc->lun_list);
 148         softc->rd_size = 4 * 1024 * 1024;
 149 #ifdef CTL_RAMDISK_PAGES
 150         softc->num_pages = softc->rd_size / PAGE_SIZE;
 151         softc->ramdisk_pages = (uint8_t **)malloc(sizeof(uint8_t *) *
 152                                                   softc->num_pages, M_RAMDISK,
 153                                                   M_WAITOK);
 154         for (i = 0; i < softc->num_pages; i++)
 155                 softc->ramdisk_pages[i] = malloc(PAGE_SIZE, M_RAMDISK,M_WAITOK);
 156 #else
 157         softc->ramdisk_buffer = (uint8_t *)malloc(softc->rd_size, M_RAMDISK,
 158                                                   M_WAITOK);
 159 #endif
 160
 161         return (0);
 162 }
 163
 164 void
 165 ctl_backend_ramdisk_shutdown(void)
 166 {
 167         struct ctl_be_ramdisk_softc *softc;
 168         struct ctl_be_ramdisk_lun *lun, *next_lun;
 169 #ifdef CTL_RAMDISK_PAGES
 170         int i;
 171 #endif
 172
 173         softc = &rd_softc;
 174
 175         mtx_lock(&softc->lock);
 176         for (lun = STAILQ_FIRST(&softc->lun_list); lun != NULL; lun = next_lun){
 177                 /*
 178                  * Grab the next LUN.  The current LUN may get removed by
 179                  * ctl_invalidate_lun(), which will call our LUN shutdown
 180                  * routine, if there is no outstanding I/O for this LUN.
 181                  */
 182                 next_lun = STAILQ_NEXT(lun, links);
 183
 184                 /*
 185                  * Drop our lock here.  Since ctl_invalidate_lun() can call
 186                  * back into us, this could potentially lead to a recursive
 187                  * lock of the same mutex, which would cause a hang.
 188                  */
 189                 mtx_unlock(&softc->lock);
 190                 ctl_disable_lun(&lun->ctl_be_lun);
 191                 ctl_invalidate_lun(&lun->ctl_be_lun);
 192                 mtx_lock(&softc->lock);
 193         }
 194         mtx_unlock(&softc->lock);
 195
 196 #ifdef CTL_RAMDISK_PAGES
 197         for (i = 0; i < softc->num_pages; i++)
 198                 free(softc->ramdisk_pages[i], M_RAMDISK);
 199
 200         free(softc->ramdisk_pages, M_RAMDISK);
 201 #else
 202         free(softc->ramdisk_buffer, M_RAMDISK);
 203 #endif
 204
 205         if (ctl_backend_deregister(&ctl_be_ramdisk_driver) != 0) {
 206                 printf("ctl_backend_ramdisk_shutdown: "
 207                        "ctl_backend_deregister() failed!\n");
 208         }
 209 }
 210
 211 static int
 212 ctl_backend_ramdisk_move_done(union ctl_io *io)
 213 {
 214 #ifdef CTL_TIME_IO
 215         struct bintime cur_bt;
 216 #endif
 217
 218         CTL_DEBUG_PRINT(("ctl_backend_ramdisk_move_done\n"));
 219         if ((io->io_hdr.port_status == 0)
 220          && ((io->io_hdr.flags & CTL_FLAG_ABORT) == 0)
 221          && ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE))
 222                 io->io_hdr.status = CTL_SUCCESS;
 223         else if ((io->io_hdr.port_status != 0)
 224               && ((io->io_hdr.flags & CTL_FLAG_ABORT) == 0)
 225               && ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_STATUS_NONE)){
 226                 /*
 227                  * For hardware error sense keys, the sense key
 228                  * specific value is defined to be a retry count,
 229                  * but we use it to pass back an internal FETD
 230                  * error code.  XXX KDM  Hopefully the FETD is only
 231                  * using 16 bits for an error code, since that's
 232                  * all the space we have in the sks field.
 233                  */
 234                 ctl_set_internal_failure(&io->scsiio,
 235                                          /*sks_valid*/ 1,
 236                                          /*retry_count*/
 237                                          io->io_hdr.port_status);
 238         }
 239 #ifdef CTL_TIME_IO
 240         getbintime(&cur_bt);
 241         bintime_sub(&cur_bt, &io->io_hdr.dma_start_bt);
 242         bintime_add(&io->io_hdr.dma_bt, &cur_bt);
 243         io->io_hdr.num_dmas++;
 244 #endif
 245
 246         if (io->scsiio.kern_sg_entries > 0)
 247                 free(io->scsiio.kern_data_ptr, M_RAMDISK);
 248         ctl_done(io);
 249         return(0);
 250 }
 251
 252 static int
 253 ctl_backend_ramdisk_submit(union ctl_io *io)
 254 {
 255         struct ctl_lba_len lbalen;
 256 #ifdef CTL_RAMDISK_PAGES
 257         struct ctl_sg_entry *sg_entries;
 258         int len_filled;
 259         int i;
 260 #endif
 261         int num_sg_entries, len;
 262         struct ctl_be_ramdisk_softc *softc;
 263         struct ctl_be_lun *ctl_be_lun;
 264         struct ctl_be_ramdisk_lun *be_lun;
 265
 266         softc = &rd_softc;
 267
 268         ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
 269                 CTL_PRIV_BACKEND_LUN].ptr;
 270         be_lun = (struct ctl_be_ramdisk_lun *)ctl_be_lun->be_lun;
 271
 272         memcpy(&lbalen, io->io_hdr.ctl_private[CTL_PRIV_LBA_LEN].bytes,
 273                sizeof(lbalen));
 274
 275         len = lbalen.len * ctl_be_lun->blocksize;
 276
 277         /*
 278          * Kick out the request if it's bigger than we can handle.
 279          */
 280         if (len > softc->rd_size) {
 281                 ctl_set_internal_failure(&io->scsiio,
 282                                          /*sks_valid*/ 0,
 283                                          /*retry_count*/ 0);
 284                 ctl_done(io);
 285                 return (CTL_RETVAL_COMPLETE);
 286         }
 287
 288         /*
 289          * Kick out the request if it's larger than the device size that
 290          * the user requested.
 291          */
 292         if (((lbalen.lba * ctl_be_lun->blocksize) + len) > be_lun->size_bytes) {
 293                 ctl_set_lba_out_of_range(&io->scsiio);
 294                 ctl_done(io);
 295                 return (CTL_RETVAL_COMPLETE);
 296         }
 297
 298 #ifdef CTL_RAMDISK_PAGES
 299         num_sg_entries = len >> PAGE_SHIFT;
 300         if ((len & (PAGE_SIZE - 1)) != 0)
 301                 num_sg_entries++;
 302
 303         if (num_sg_entries > 1) {
 304                 io->scsiio.kern_data_ptr = malloc(sizeof(struct ctl_sg_entry) *
 305                                                   num_sg_entries, M_RAMDISK,
 306                                                   M_WAITOK);
 307                 sg_entries = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
 308                 for (i = 0, len_filled = 0; i < num_sg_entries;
 309                      i++, len_filled += PAGE_SIZE) {
 310                         sg_entries[i].addr = softc->ramdisk_pages[i];
 311                         sg_entries[i].len = ctl_min(PAGE_SIZE,
 312                                                     len - len_filled);
 313                 }
 314         } else {
 315 #endif /* CTL_RAMDISK_PAGES */
 316                 /*
 317                  * If this is less than 1 page, don't bother allocating a
 318                  * scatter/gather list for it.  This saves time/overhead.
 319                  */
 320                 num_sg_entries = 0;
 321 #ifdef CTL_RAMDISK_PAGES
 322                 io->scsiio.kern_data_ptr = softc->ramdisk_pages[0];
 323 #else
 324                 io->scsiio.kern_data_ptr = softc->ramdisk_buffer;
 325 #endif
 326 #ifdef CTL_RAMDISK_PAGES
 327         }
 328 #endif
 329
 330         io->scsiio.be_move_done = ctl_backend_ramdisk_move_done;
 331         io->scsiio.kern_data_len = len;
 332         io->scsiio.kern_total_len = len;
 333         io->scsiio.kern_rel_offset = 0;
 334         io->scsiio.kern_data_resid = 0;
 335         io->scsiio.kern_sg_entries = num_sg_entries;
 336         io->io_hdr.flags |= CTL_FLAG_ALLOCATED | CTL_FLAG_KDPTR_SGLIST;
 337 #ifdef CTL_TIME_IO
 338         getbintime(&io->io_hdr.dma_start_bt);
 339 #endif
 340         ctl_datamove(io);
 341
 342         return (CTL_RETVAL_COMPLETE);
 343 }
 344
 345 static int
 346 ctl_backend_ramdisk_ioctl(struct cdev *dev, u_long cmd, caddr_t addr,
 347                           int flag, struct thread *td)
 348 {
 349         struct ctl_be_ramdisk_softc *softc;
 350         int retval;
 351
 352         retval = 0;
 353         softc = &rd_softc;
 354
 355         switch (cmd) {
 356         case CTL_LUN_REQ: {
 357                 struct ctl_lun_req *lun_req;
 358
 359                 lun_req = (struct ctl_lun_req *)addr;
 360
 361                 switch (lun_req->reqtype) {
 362                 case CTL_LUNREQ_CREATE:
 363                         retval = ctl_backend_ramdisk_create(softc, lun_req,
 364                                                             /*do_wait*/ 1);
 365                         break;
 366                 case CTL_LUNREQ_RM:
 367                         retval = ctl_backend_ramdisk_rm(softc, lun_req);
 368                         break;
 369                 case CTL_LUNREQ_MODIFY:
 370                         retval = ctl_backend_ramdisk_modify(softc, lun_req);
 371                         break;
 372                 default:
 373                         lun_req->status = CTL_LUN_ERROR;
 374                         snprintf(lun_req->error_str, sizeof(lun_req->error_str),
 375                                  "%s: invalid LUN request type %d", __func__,
 376                                  lun_req->reqtype);
 377                         break;
 378                 }
 379                 break;
 380         }
 381         default:
 382                 retval = ENOTTY;
 383                 break;
 384         }
 385
 386         return (retval);
 387 }
 388
 389 static int
 390 ctl_backend_ramdisk_rm(struct ctl_be_ramdisk_softc *softc,
 391                        struct ctl_lun_req *req)
 392 {
 393         struct ctl_be_ramdisk_lun *be_lun;
 394         struct ctl_lun_rm_params *params;
 395         int retval;
 396
 397
 398         retval = 0;
 399         params = &req->reqdata.rm;
 400
 401         be_lun = NULL;
 402
 403         mtx_lock(&softc->lock);
 404
 405         STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
 406                 if (be_lun->ctl_be_lun.lun_id == params->lun_id)
 407                         break;
 408         }
 409         mtx_unlock(&softc->lock);
 410
 411         if (be_lun == NULL) {
 412                 snprintf(req->error_str, sizeof(req->error_str),
 413                          "%s: LUN %u is not managed by the ramdisk backend",
 414                          __func__, params->lun_id);
 415                 goto bailout_error;
 416         }
 417
 418         retval = ctl_disable_lun(&be_lun->ctl_be_lun);
 419
 420         if (retval != 0) {
 421                 snprintf(req->error_str, sizeof(req->error_str),
 422                          "%s: error %d returned from ctl_disable_lun() for "
 423                          "LUN %d", __func__, retval, params->lun_id);
 424                 goto bailout_error;
 425         }
 426
 427         /*
 428          * Set the waiting flag before we invalidate the LUN.  Our shutdown
 429          * routine can be called any time after we invalidate the LUN,
 430          * and can be called from our context.
 431          *
 432          * This tells the shutdown routine that we're waiting, or we're
 433          * going to wait for the shutdown to happen.
 434          */
 435         mtx_lock(&softc->lock);
 436         be_lun->flags |= CTL_BE_RAMDISK_LUN_WAITING;
 437         mtx_unlock(&softc->lock);
 438
 439         retval = ctl_invalidate_lun(&be_lun->ctl_be_lun);
 440         if (retval != 0) {
 441                 snprintf(req->error_str, sizeof(req->error_str),
 442                          "%s: error %d returned from ctl_invalidate_lun() for "
 443                          "LUN %d", __func__, retval, params->lun_id);
 444                 mtx_lock(&softc->lock);
 445                 be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 446                 mtx_unlock(&softc->lock);
 447                 goto bailout_error;
 448         }
 449
 450         mtx_lock(&softc->lock);
 451
 452         while ((be_lun->flags & CTL_BE_RAMDISK_LUN_UNCONFIGURED) == 0) {
 453                 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlram", 0);
 454                 if (retval == EINTR)
 455                         break;
 456         }
 457         be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 458
 459         /*
 460          * We only remove this LUN from the list and free it (below) if
 461          * retval == 0.  If the user interrupted the wait, we just bail out
 462          * without actually freeing the LUN.  We let the shutdown routine
 463          * free the LUN if that happens.
 464          */
 465         if (retval == 0) {
 466                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 467                               links);
 468                 softc->num_luns--;
 469         }
 470
 471         mtx_unlock(&softc->lock);
 472
 473         if (retval == 0)
 474                 free(be_lun, M_RAMDISK);
 475
 476         req->status = CTL_LUN_OK;
 477
 478         return (retval);
 479
 480 bailout_error:
 481         req->status = CTL_LUN_ERROR;
 482
 483         return (0);
 484 }
 485
 486 static int
 487 ctl_backend_ramdisk_create(struct ctl_be_ramdisk_softc *softc,
 488                            struct ctl_lun_req *req, int do_wait)
 489 {
 490         struct ctl_be_ramdisk_lun *be_lun;
 491         struct ctl_lun_create_params *params;
 492         uint32_t blocksize;
 493         char tmpstr[32];
 494         int retval;
 495
 496         retval = 0;
 497         params = &req->reqdata.create;
 498         if (params->blocksize_bytes != 0)
 499                 blocksize = params->blocksize_bytes;
 500         else
 501                 blocksize = 512;
 502
 503         be_lun = malloc(sizeof(*be_lun), M_RAMDISK, M_ZERO | (do_wait ?
 504                         M_WAITOK : M_NOWAIT));
 505
 506         if (be_lun == NULL) {
 507                 snprintf(req->error_str, sizeof(req->error_str),
 508                          "%s: error allocating %zd bytes", __func__,
 509                          sizeof(*be_lun));
 510                 goto bailout_error;
 511         }
 512
 513         if (params->flags & CTL_LUN_FLAG_DEV_TYPE)
 514                 be_lun->ctl_be_lun.lun_type = params->device_type;
 515         else
 516                 be_lun->ctl_be_lun.lun_type = T_DIRECT;
 517
 518         if (be_lun->ctl_be_lun.lun_type == T_DIRECT) {
 519
 520                 if (params->lun_size_bytes < blocksize) {
 521                         snprintf(req->error_str, sizeof(req->error_str),
 522                                  "%s: LUN size %ju < blocksize %u", __func__,
 523                                  params->lun_size_bytes, blocksize);
 524                         goto bailout_error;
 525                 }
 526
 527                 be_lun->size_blocks = params->lun_size_bytes / blocksize;
 528                 be_lun->size_bytes = be_lun->size_blocks * blocksize;
 529
 530                 be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
 531         } else {
 532                 be_lun->ctl_be_lun.maxlba = 0;
 533                 blocksize = 0;
 534                 be_lun->size_bytes = 0;
 535                 be_lun->size_blocks = 0;
 536         }
 537
 538         be_lun->ctl_be_lun.blocksize = blocksize;
 539
 540         /* Tell the user the blocksize we ended up using */
 541         params->blocksize_bytes = blocksize;
 542
 543         /* Tell the user the exact size we ended up using */
 544         params->lun_size_bytes = be_lun->size_bytes;
 545
 546         be_lun->softc = softc;
 547
 548         be_lun->flags = CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 549         be_lun->ctl_be_lun.flags = CTL_LUN_FLAG_PRIMARY;
 550         be_lun->ctl_be_lun.be_lun = be_lun;
 551
 552         if (params->flags & CTL_LUN_FLAG_ID_REQ) {
 553                 be_lun->ctl_be_lun.req_lun_id = params->req_lun_id;
 554                 be_lun->ctl_be_lun.flags |= CTL_LUN_FLAG_ID_REQ;
 555         } else
 556                 be_lun->ctl_be_lun.req_lun_id = 0;
 557
 558         be_lun->ctl_be_lun.lun_shutdown = ctl_backend_ramdisk_lun_shutdown;
 559         be_lun->ctl_be_lun.lun_config_status =
 560                 ctl_backend_ramdisk_lun_config_status;
 561         be_lun->ctl_be_lun.be = &ctl_be_ramdisk_driver;
 562         if ((params->flags & CTL_LUN_FLAG_SERIAL_NUM) == 0) {
 563                 snprintf(tmpstr, sizeof(tmpstr), "MYSERIAL%4d",
 564                          softc->num_luns);
 565                 strncpy((char *)be_lun->ctl_be_lun.serial_num, tmpstr,
 566                         ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
 567                         sizeof(tmpstr)));
 568
 569                 /* Tell the user what we used for a serial number */
 570                 strncpy((char *)params->serial_num, tmpstr,
 571                         ctl_min(sizeof(params->serial_num), sizeof(tmpstr)));
 572         } else {
 573                 strncpy((char *)be_lun->ctl_be_lun.serial_num,
 574                         params->serial_num,
 575                         ctl_min(sizeof(be_lun->ctl_be_lun.serial_num),
 576                         sizeof(params->serial_num)));
 577         }
 578         if ((params->flags & CTL_LUN_FLAG_DEVID) == 0) {
 579                 snprintf(tmpstr, sizeof(tmpstr), "MYDEVID%4d", softc->num_luns);
 580                 strncpy((char *)be_lun->ctl_be_lun.device_id, tmpstr,
 581                         ctl_min(sizeof(be_lun->ctl_be_lun.device_id),
 582                         sizeof(tmpstr)));
 583
 584                 /* Tell the user what we used for a device ID */
 585                 strncpy((char *)params->device_id, tmpstr,
 586                         ctl_min(sizeof(params->device_id), sizeof(tmpstr)));
 587         } else {
 588                 strncpy((char *)be_lun->ctl_be_lun.device_id,
 589                         params->device_id,
 590                         ctl_min(sizeof(be_lun->ctl_be_lun.device_id),
 591                                 sizeof(params->device_id)));
 592         }
 593
 594         mtx_lock(&softc->lock);
 595         softc->num_luns++;
 596         STAILQ_INSERT_TAIL(&softc->lun_list, be_lun, links);
 597
 598         mtx_unlock(&softc->lock);
 599
 600         retval = ctl_add_lun(&be_lun->ctl_be_lun);
 601         if (retval != 0) {
 602                 mtx_lock(&softc->lock);
 603                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 604                               links);
 605                 softc->num_luns--;
 606                 mtx_unlock(&softc->lock);
 607                 snprintf(req->error_str, sizeof(req->error_str),
 608                          "%s: ctl_add_lun() returned error %d, see dmesg for "
 609                         "details", __func__, retval);
 610                 retval = 0;
 611                 goto bailout_error;
 612         }
 613
 614         if (do_wait == 0)
 615                 return (retval);
 616
 617         mtx_lock(&softc->lock);
 618
 619         /*
 620          * Tell the config_status routine that we're waiting so it won't
 621          * clean up the LUN in the event of an error.
 622          */
 623         be_lun->flags |= CTL_BE_RAMDISK_LUN_WAITING;
 624
 625         while (be_lun->flags & CTL_BE_RAMDISK_LUN_UNCONFIGURED) {
 626                 retval = msleep(be_lun, &softc->lock, PCATCH, "ctlram", 0);
 627                 if (retval == EINTR)
 628                         break;
 629         }
 630         be_lun->flags &= ~CTL_BE_RAMDISK_LUN_WAITING;
 631
 632         if (be_lun->flags & CTL_BE_RAMDISK_LUN_CONFIG_ERR) {
 633                 snprintf(req->error_str, sizeof(req->error_str),
 634                          "%s: LUN configuration error, see dmesg for details",
 635                          __func__);
 636                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 637                               links);
 638                 softc->num_luns--;
 639                 mtx_unlock(&softc->lock);
 640                 goto bailout_error;
 641         } else {
 642                 params->req_lun_id = be_lun->ctl_be_lun.lun_id;
 643         }
 644         mtx_unlock(&softc->lock);
 645
 646         req->status = CTL_LUN_OK;
 647
 648         return (retval);
 649
 650 bailout_error:
 651         req->status = CTL_LUN_ERROR;
 652         free(be_lun, M_RAMDISK);
 653
 654         return (retval);
 655 }
 656
 657 static int
 658 ctl_backend_ramdisk_modify(struct ctl_be_ramdisk_softc *softc,
 659                        struct ctl_lun_req *req)
 660 {
 661         struct ctl_be_ramdisk_lun *be_lun;
 662         struct ctl_lun_modify_params *params;
 663         uint32_t blocksize;
 664
 665         params = &req->reqdata.modify;
 666
 667         be_lun = NULL;
 668
 669         mtx_lock(&softc->lock);
 670         STAILQ_FOREACH(be_lun, &softc->lun_list, links) {
 671                 if (be_lun->ctl_be_lun.lun_id == params->lun_id)
 672                         break;
 673         }
 674         mtx_unlock(&softc->lock);
 675
 676         if (be_lun == NULL) {
 677                 snprintf(req->error_str, sizeof(req->error_str),
 678                          "%s: LUN %u is not managed by the ramdisk backend",
 679                          __func__, params->lun_id);
 680                 goto bailout_error;
 681         }
 682
 683         if (params->lun_size_bytes == 0) {
 684                 snprintf(req->error_str, sizeof(req->error_str),
 685                         "%s: LUN size \"auto\" not supported "
 686                         "by the ramdisk backend", __func__);
 687                 goto bailout_error;
 688         }
 689
 690         blocksize = be_lun->ctl_be_lun.blocksize;
 691
 692         if (params->lun_size_bytes < blocksize) {
 693                 snprintf(req->error_str, sizeof(req->error_str),
 694                         "%s: LUN size %ju < blocksize %u", __func__,
 695                         params->lun_size_bytes, blocksize);
 696                 goto bailout_error;
 697         }
 698
 699         be_lun->size_blocks = params->lun_size_bytes / blocksize;
 700         be_lun->size_bytes = be_lun->size_blocks * blocksize;
 701
 702         /*
 703          * The maximum LBA is the size - 1.
 704          *
 705          * XXX: Note that this field is being updated without locking,
 706          *      which might cause problems on 32-bit architectures.
 707          */
 708         be_lun->ctl_be_lun.maxlba = be_lun->size_blocks - 1;
 709         ctl_lun_capacity_changed(&be_lun->ctl_be_lun);
 710
 711         /* Tell the user the exact size we ended up using */
 712         params->lun_size_bytes = be_lun->size_bytes;
 713
 714         req->status = CTL_LUN_OK;
 715
 716         return (0);
 717
 718 bailout_error:
 719         req->status = CTL_LUN_ERROR;
 720
 721         return (0);
 722 }
 723
 724 static void
 725 ctl_backend_ramdisk_lun_shutdown(void *be_lun)
 726 {
 727         struct ctl_be_ramdisk_lun *lun;
 728         struct ctl_be_ramdisk_softc *softc;
 729         int do_free;
 730
 731         lun = (struct ctl_be_ramdisk_lun *)be_lun;
 732         softc = lun->softc;
 733         do_free = 0;
 734
 735         mtx_lock(&softc->lock);
 736
 737         lun->flags |= CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 738
 739         if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) {
 740                 wakeup(lun);
 741         } else {
 742                 STAILQ_REMOVE(&softc->lun_list, be_lun, ctl_be_ramdisk_lun,
 743                               links);
 744                 softc->num_luns--;
 745                 do_free = 1;
 746         }
 747
 748         mtx_unlock(&softc->lock);
 749
 750         if (do_free != 0)
 751                 free(be_lun, M_RAMDISK);
 752 }
 753
 754 static void
 755 ctl_backend_ramdisk_lun_config_status(void *be_lun,
 756                                       ctl_lun_config_status status)
 757 {
 758         struct ctl_be_ramdisk_lun *lun;
 759         struct ctl_be_ramdisk_softc *softc;
 760
 761         lun = (struct ctl_be_ramdisk_lun *)be_lun;
 762         softc = lun->softc;
 763
 764         if (status == CTL_LUN_CONFIG_OK) {
 765                 mtx_lock(&softc->lock);
 766                 lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 767                 if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING)
 768                         wakeup(lun);
 769                 mtx_unlock(&softc->lock);
 770
 771                 /*
 772                  * We successfully added the LUN, attempt to enable it.
 773                  */
 774                 if (ctl_enable_lun(&lun->ctl_be_lun) != 0) {
 775                         printf("%s: ctl_enable_lun() failed!\n", __func__);
 776                         if (ctl_invalidate_lun(&lun->ctl_be_lun) != 0) {
 777                                 printf("%s: ctl_invalidate_lun() failed!\n",
 778                                        __func__);
 779                         }
 780                 }
 781
 782                 return;
 783         }
 784
 785
 786         mtx_lock(&softc->lock);
 787         lun->flags &= ~CTL_BE_RAMDISK_LUN_UNCONFIGURED;
 788
 789         /*
 790          * If we have a user waiting, let him handle the cleanup.  If not,
 791          * clean things up here.
 792          */
 793         if (lun->flags & CTL_BE_RAMDISK_LUN_WAITING) {
 794                 lun->flags |= CTL_BE_RAMDISK_LUN_CONFIG_ERR;
 795                 wakeup(lun);
 796         } else {
 797                 STAILQ_REMOVE(&softc->lun_list, lun, ctl_be_ramdisk_lun,
 798                               links);
 799                 softc->num_luns--;
 800                 free(lun, M_RAMDISK);
 801         }
 802         mtx_unlock(&softc->lock);
 803 }
 804
 805 static int
 806 ctl_backend_ramdisk_config_write(union ctl_io *io)
 807 {
 808         struct ctl_be_ramdisk_softc *softc;
 809         int retval;
 810
 811         retval = 0;
 812         softc = &rd_softc;
 813
 814         switch (io->scsiio.cdb[0]) {
 815         case SYNCHRONIZE_CACHE:
 816         case SYNCHRONIZE_CACHE_16:
 817                 /*
 818                  * The upper level CTL code will filter out any CDBs with
 819                  * the immediate bit set and return the proper error.  It
 820                  * will also not allow a sync cache command to go to a LUN
 821                  * that is powered down.
 822                  *
 823                  * We don't really need to worry about what LBA range the
 824                  * user asked to be synced out.  When they issue a sync
 825                  * cache command, we'll sync out the whole thing.
 826                  *
 827                  * This is obviously just a stubbed out implementation.
 828                  * The real implementation will be in the RAIDCore/CTL
 829                  * interface, and can only really happen when RAIDCore
 830                  * implements a per-array cache sync.
 831                  */
 832                 ctl_set_success(&io->scsiio);
 833                 ctl_config_write_done(io);
 834                 break;
 835         case START_STOP_UNIT: {
 836                 struct scsi_start_stop_unit *cdb;
 837                 struct ctl_be_lun *ctl_be_lun;
 838                 struct ctl_be_ramdisk_lun *be_lun;
 839
 840                 cdb = (struct scsi_start_stop_unit *)io->scsiio.cdb;
 841
 842                 ctl_be_lun = (struct ctl_be_lun *)io->io_hdr.ctl_private[
 843                         CTL_PRIV_BACKEND_LUN].ptr;
 844                 be_lun = (struct ctl_be_ramdisk_lun *)ctl_be_lun->be_lun;
 845
 846                 if (cdb->how & SSS_START)
 847                         retval = ctl_start_lun(ctl_be_lun);
 848                 else {
 849                         retval = ctl_stop_lun(ctl_be_lun);
 850 #ifdef NEEDTOPORT
 851                         if ((retval == 0)
 852                          && (cdb->byte2 & SSS_ONOFFLINE))
 853                                 retval = ctl_lun_offline(ctl_be_lun);
 854 #endif
 855                 }
 856
 857                 /*
 858                  * In general, the above routines should not fail.  They
 859                  * just set state for the LUN.  So we've got something
 860                  * pretty wrong here if we can't start or stop the LUN.
 861                  */
 862                 if (retval != 0) {
 863                         ctl_set_internal_failure(&io->scsiio,
 864                                                  /*sks_valid*/ 1,
 865                                                  /*retry_count*/ 0xf051);
 866                         retval = CTL_RETVAL_COMPLETE;
 867                 } else {
 868                         ctl_set_success(&io->scsiio);
 869                 }
 870                 ctl_config_write_done(io);
 871                 break;
 872         }
 873         default:
 874                 ctl_set_invalid_opcode(&io->scsiio);
 875                 ctl_config_write_done(io);
 876                 retval = CTL_RETVAL_COMPLETE;
 877                 break;
 878         }
 879
 880         return (retval);
 881 }
 882
 883 static int
 884 ctl_backend_ramdisk_config_read(union ctl_io *io)
 885 {
 886         /*
 887          * XXX KDM need to implement!!
 888          */
 889         return (0);
 890 }