sys/cam/cam.c

   1 /*-
   2  * Generic utility routines for the Common Access Method layer.
   3  *
   4  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   5  *
   6  * Copyright (c) 1997 Justin T. Gibbs.
   7  * All rights reserved.
   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, immediately at the beginning of the file.
  15  * 2. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/param.h>
  35 #ifdef _KERNEL
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/sysctl.h>
  39 #else /* _KERNEL */
  40 #include <stdlib.h>
  41 #include <stdio.h>
  42 #include <string.h>
  43 #include <camlib.h>
  44 #endif /* _KERNEL */
  45
  46 #include <cam/cam.h>
  47 #include <cam/cam_ccb.h>
  48 #include <cam/scsi/scsi_all.h>
  49 #include <cam/scsi/smp_all.h>
  50 #include <sys/sbuf.h>
  51
  52 #ifdef _KERNEL
  53 #include <sys/libkern.h>
  54 #include <cam/cam_queue.h>
  55 #include <cam/cam_xpt.h>
  56
  57 FEATURE(scbus, "SCSI devices support");
  58
  59 #endif
  60
  61 static int      camstatusentrycomp(const void *key, const void *member);
  62
  63 const struct cam_status_entry cam_status_table[] = {
  64         { CAM_REQ_INPROG,        "CCB request is in progress"                },
  65         { CAM_REQ_CMP,           "CCB request completed without error"       },
  66         { CAM_REQ_ABORTED,       "CCB request aborted by the host"           },
  67         { CAM_UA_ABORT,          "Unable to abort CCB request"               },
  68         { CAM_REQ_CMP_ERR,       "CCB request completed with an error"       },
  69         { CAM_BUSY,              "CAM subsystem is busy"                     },
  70         { CAM_REQ_INVALID,       "CCB request was invalid"                   },
  71         { CAM_PATH_INVALID,      "Supplied Path ID is invalid"               },
  72         { CAM_DEV_NOT_THERE,     "Device Not Present"                        },
  73         { CAM_UA_TERMIO,         "Unable to terminate I/O CCB request"       },
  74         { CAM_SEL_TIMEOUT,       "Selection Timeout"                         },
  75         { CAM_CMD_TIMEOUT,       "Command timeout"                           },
  76         { CAM_SCSI_STATUS_ERROR, "SCSI Status Error"                         },
  77         { CAM_MSG_REJECT_REC,    "Message Reject Reveived"                   },
  78         { CAM_SCSI_BUS_RESET,    "SCSI Bus Reset Sent/Received"              },
  79         { CAM_UNCOR_PARITY,      "Uncorrectable parity/CRC error"            },
  80         { CAM_AUTOSENSE_FAIL,    "Auto-Sense Retrieval Failed"               },
  81         { CAM_NO_HBA,            "No HBA Detected"                           },
  82         { CAM_DATA_RUN_ERR,      "Data Overrun error"                        },
  83         { CAM_UNEXP_BUSFREE,     "Unexpected Bus Free"                       },
  84         { CAM_SEQUENCE_FAIL,     "Target Bus Phase Sequence Failure"         },
  85         { CAM_CCB_LEN_ERR,       "CCB length supplied is inadequate"         },
  86         { CAM_PROVIDE_FAIL,      "Unable to provide requested capability"    },
  87         { CAM_BDR_SENT,          "SCSI BDR Message Sent"                     },
  88         { CAM_REQ_TERMIO,        "CCB request terminated by the host"        },
  89         { CAM_UNREC_HBA_ERROR,   "Unrecoverable Host Bus Adapter Error"      },
  90         { CAM_REQ_TOO_BIG,       "The request was too large for this host"   },
  91         { CAM_REQUEUE_REQ,       "Unconditionally Re-queue Request",         },
  92         { CAM_ATA_STATUS_ERROR,  "ATA Status Error"                          },
  93         { CAM_SCSI_IT_NEXUS_LOST,"Initiator/Target Nexus Lost"               },
  94         { CAM_SMP_STATUS_ERROR,  "SMP Status Error"                          },
  95         { CAM_IDE,               "Initiator Detected Error Message Received" },
  96         { CAM_RESRC_UNAVAIL,     "Resource Unavailable"                      },
  97         { CAM_UNACKED_EVENT,     "Unacknowledged Event by Host"              },
  98         { CAM_MESSAGE_RECV,      "Message Received in Host Target Mode"      },
  99         { CAM_INVALID_CDB,       "Invalid CDB received in Host Target Mode"  },
 100         { CAM_LUN_INVALID,       "Invalid Lun"                               },
 101         { CAM_TID_INVALID,       "Invalid Target ID"                         },
 102         { CAM_FUNC_NOTAVAIL,     "Function Not Available"                    },
 103         { CAM_NO_NEXUS,          "Nexus Not Established"                     },
 104         { CAM_IID_INVALID,       "Invalid Initiator ID"                      },
 105         { CAM_CDB_RECVD,         "CDB Received"                              },
 106         { CAM_LUN_ALRDY_ENA,     "LUN Already Enabled for Target Mode"       },
 107         { CAM_SCSI_BUSY,         "SCSI Bus Busy"                             },
 108 };
 109
 110 #ifdef _KERNEL
 111 SYSCTL_NODE(_kern, OID_AUTO, cam, CTLFLAG_RD, 0, "CAM Subsystem");
 112
 113 #ifndef CAM_DEFAULT_SORT_IO_QUEUES
 114 #define CAM_DEFAULT_SORT_IO_QUEUES 1
 115 #endif
 116
 117 int cam_sort_io_queues = CAM_DEFAULT_SORT_IO_QUEUES;
 118 SYSCTL_INT(_kern_cam, OID_AUTO, sort_io_queues, CTLFLAG_RWTUN,
 119     &cam_sort_io_queues, 0, "Sort IO queues to try and optimise disk access patterns");
 120 #endif
 121
 122 void
 123 cam_strvis(u_int8_t *dst, const u_int8_t *src, int srclen, int dstlen)
 124 {
 125
 126         /* Trim leading/trailing spaces, nulls. */
 127         while (srclen > 0 && src[0] == ' ')
 128                 src++, srclen--;
 129         while (srclen > 0
 130             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
 131                 srclen--;
 132
 133         while (srclen > 0 && dstlen > 1) {
 134                 u_int8_t *cur_pos = dst;
 135
 136                 if (*src < 0x20 || *src >= 0x80) {
 137                         /* SCSI-II Specifies that these should never occur. */
 138                         /* non-printable character */
 139                         if (dstlen > 4) {
 140                                 *cur_pos++ = '\\';
 141                                 *cur_pos++ = ((*src & 0300) >> 6) + '0';
 142                                 *cur_pos++ = ((*src & 0070) >> 3) + '0';
 143                                 *cur_pos++ = ((*src & 0007) >> 0) + '0';
 144                         } else {
 145                                 *cur_pos++ = '?';
 146                         }
 147                 } else {
 148                         /* normal character */
 149                         *cur_pos++ = *src;
 150                 }
 151                 src++;
 152                 srclen--;
 153                 dstlen -= cur_pos - dst;
 154                 dst = cur_pos;
 155         }
 156         *dst = '\0';
 157 }
 158
 159 void
 160 cam_strvis_sbuf(struct sbuf *sb, const u_int8_t *src, int srclen,
 161                 uint32_t flags)
 162 {
 163
 164         /* Trim leading/trailing spaces, nulls. */
 165         while (srclen > 0 && src[0] == ' ')
 166                 src++, srclen--;
 167         while (srclen > 0
 168             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
 169                 srclen--;
 170
 171         while (srclen > 0) {
 172                 if (*src < 0x20 || *src >= 0x80) {
 173                         /* SCSI-II Specifies that these should never occur. */
 174                         /* non-printable character */
 175                         switch (flags & CAM_STRVIS_FLAG_NONASCII_MASK) {
 176                         case CAM_STRVIS_FLAG_NONASCII_ESC:
 177                                 sbuf_printf(sb, "\\%c%c%c",
 178                                     ((*src & 0300) >> 6) + '0',
 179                                     ((*src & 0070) >> 3) + '0',
 180                                     ((*src & 0007) >> 0) + '0');
 181                                 break;
 182                         case CAM_STRVIS_FLAG_NONASCII_RAW:
 183                                 /*
 184                                  * If we run into a NUL, just transform it
 185                                  * into a space.
 186                                  */
 187                                 if (*src != 0x00)
 188                                         sbuf_putc(sb, *src);
 189                                 else
 190                                         sbuf_putc(sb, ' ');
 191                                 break;
 192                         case CAM_STRVIS_FLAG_NONASCII_SPC:
 193                                 sbuf_putc(sb, ' ');
 194                                 break;
 195                         case CAM_STRVIS_FLAG_NONASCII_TRIM:
 196                         default:
 197                                 break;
 198                         }
 199                 } else {
 200                         /* normal character */
 201                         sbuf_putc(sb, *src);
 202                 }
 203                 src++;
 204                 srclen--;
 205         }
 206 }
 207
 208
 209 /*
 210  * Compare string with pattern, returning 0 on match.
 211  * Short pattern matches trailing blanks in name,
 212  * Shell globbing rules apply: * matches 0 or more characters,
 213  * ? matchces one character, [...] denotes a set to match one char,
 214  * [^...] denotes a complimented set to match one character.
 215  * Spaces in str used to match anything in the pattern string
 216  * but was removed because it's a bug. No current patterns require
 217  * it, as far as I know, but it's impossible to know what drives
 218  * returned.
 219  *
 220  * Each '*' generates recursion, so keep the number of * in check.
 221  */
 222 int
 223 cam_strmatch(const u_int8_t *str, const u_int8_t *pattern, int str_len)
 224 {
 225
 226         while (*pattern != '\0' && str_len > 0) {
 227                 if (*pattern == '*') {
 228                         pattern++;
 229                         if (*pattern == '\0')
 230                                 return (0);
 231                         do {
 232                                 if (cam_strmatch(str, pattern, str_len) == 0)
 233                                         return (0);
 234                                 str++;
 235                                 str_len--;
 236                         } while (str_len > 0);
 237                         return (1);
 238                 } else if (*pattern == '[') {
 239                         int negate_range, ok;
 240                         uint8_t pc = UCHAR_MAX;
 241                         uint8_t sc;
 242
 243                         ok = 0;
 244                         sc = *str++;
 245                         str_len--;
 246                         pattern++;
 247                         if ((negate_range = (*pattern == '^')) != 0)
 248                                 pattern++;
 249                         while ((*pattern != ']') && *pattern != '\0') {
 250                                 if (*pattern == '-') {
 251                                         if (pattern[1] == '\0') /* Bad pattern */
 252                                                 return (1);
 253                                         if (sc >= pc && sc <= pattern[1])
 254                                                 ok = 1;
 255                                         pattern++;
 256                                 } else if (*pattern == sc)
 257                                         ok = 1;
 258                                 pc = *pattern;
 259                                 pattern++;
 260                         }
 261                         if (ok == negate_range)
 262                                 return (1);
 263                         pattern++;
 264                 } else if (*pattern == '?') {
 265                         /*
 266                          * NB: || *str == ' ' of the old code is a bug and was
 267                          * removed.  If you add it back, keep this the last if
 268                          * before the naked else */
 269                         pattern++;
 270                         str++;
 271                         str_len--;
 272                 } else {
 273                         if (*str != *pattern)
 274                                 return (1);
 275                         pattern++;
 276                         str++;
 277                         str_len--;
 278                 }
 279         }
 280
 281         /* '*' is allowed to match nothing, so gobble it */
 282         while (*pattern == '*')
 283                 pattern++;
 284
 285         if ( *pattern != '\0') {
 286                 /* Pattern not fully consumed.  Not a match */
 287                 return (1);
 288         }
 289
 290         /* Eat trailing spaces, which get added by SAT */
 291         while (str_len > 0 && *str == ' ') {
 292                 str++;
 293                 str_len--;
 294         }
 295
 296         return (str_len);
 297 }
 298
 299 caddr_t
 300 cam_quirkmatch(caddr_t target, caddr_t quirk_table, int num_entries,
 301                int entry_size, cam_quirkmatch_t *comp_func)
 302 {
 303         for (; num_entries > 0; num_entries--, quirk_table += entry_size) {
 304                 if ((*comp_func)(target, quirk_table) == 0)
 305                         return (quirk_table);
 306         }
 307         return (NULL);
 308 }
 309
 310 const struct cam_status_entry*
 311 cam_fetch_status_entry(cam_status status)
 312 {
 313         status &= CAM_STATUS_MASK;
 314         return (bsearch(&status, &cam_status_table,
 315                         nitems(cam_status_table),
 316                         sizeof(*cam_status_table),
 317                         camstatusentrycomp));
 318 }
 319
 320 static int
 321 camstatusentrycomp(const void *key, const void *member)
 322 {
 323         cam_status status;
 324         const struct cam_status_entry *table_entry;
 325
 326         status = *(const cam_status *)key;
 327         table_entry = (const struct cam_status_entry *)member;
 328
 329         return (status - table_entry->status_code);
 330 }
 331
 332
 333 #ifdef _KERNEL
 334 char *
 335 cam_error_string(union ccb *ccb, char *str, int str_len,
 336                  cam_error_string_flags flags,
 337                  cam_error_proto_flags proto_flags)
 338 #else /* !_KERNEL */
 339 char *
 340 cam_error_string(struct cam_device *device, union ccb *ccb, char *str,
 341                  int str_len, cam_error_string_flags flags,
 342                  cam_error_proto_flags proto_flags)
 343 #endif /* _KERNEL/!_KERNEL */
 344 {
 345         char path_str[64];
 346         struct sbuf sb;
 347
 348         if ((ccb == NULL)
 349          || (str == NULL)
 350          || (str_len <= 0))
 351                 return(NULL);
 352
 353         if (flags == CAM_ESF_NONE)
 354                 return(NULL);
 355
 356         switch (ccb->ccb_h.func_code) {
 357                 case XPT_ATA_IO:
 358                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
 359                         case CAM_EPF_NONE:
 360                                 break;
 361                         case CAM_EPF_ALL:
 362                         case CAM_EPF_NORMAL:
 363                                 proto_flags |= CAM_EAF_PRINT_RESULT;
 364                                 /* FALLTHROUGH */
 365                         case CAM_EPF_MINIMAL:
 366                                 proto_flags |= CAM_EAF_PRINT_STATUS;
 367                                 /* FALLTHROUGH */
 368                         default:
 369                                 break;
 370                         }
 371                         break;
 372                 case XPT_SCSI_IO:
 373                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
 374                         case CAM_EPF_NONE:
 375                                 break;
 376                         case CAM_EPF_ALL:
 377                         case CAM_EPF_NORMAL:
 378                                 proto_flags |= CAM_ESF_PRINT_SENSE;
 379                                 /* FALLTHROUGH */
 380                         case CAM_EPF_MINIMAL:
 381                                 proto_flags |= CAM_ESF_PRINT_STATUS;
 382                                 /* FALLTHROUGH */
 383                         default:
 384                                 break;
 385                         }
 386                         break;
 387                 case XPT_SMP_IO:
 388                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
 389                         case CAM_EPF_NONE:
 390                                 break;
 391                         case CAM_EPF_ALL:
 392                                 proto_flags |= CAM_ESMF_PRINT_FULL_CMD;
 393                                 /* FALLTHROUGH */
 394                         case CAM_EPF_NORMAL:
 395                         case CAM_EPF_MINIMAL:
 396                                 proto_flags |= CAM_ESMF_PRINT_STATUS;
 397                                 /* FALLTHROUGH */
 398                         default:
 399                                 break;
 400                         }
 401                         break;
 402                 default:
 403                         break;
 404         }
 405 #ifdef _KERNEL
 406         xpt_path_string(ccb->csio.ccb_h.path, path_str, sizeof(path_str));
 407 #else /* !_KERNEL */
 408         cam_path_string(device, path_str, sizeof(path_str));
 409 #endif /* _KERNEL/!_KERNEL */
 410
 411         sbuf_new(&sb, str, str_len, 0);
 412
 413         if (flags & CAM_ESF_COMMAND) {
 414                 sbuf_cat(&sb, path_str);
 415                 switch (ccb->ccb_h.func_code) {
 416                 case XPT_ATA_IO:
 417                         ata_command_sbuf(&ccb->ataio, &sb);
 418                         break;
 419                 case XPT_SCSI_IO:
 420 #ifdef _KERNEL
 421                         scsi_command_string(&ccb->csio, &sb);
 422 #else /* !_KERNEL */
 423                         scsi_command_string(device, &ccb->csio, &sb);
 424 #endif /* _KERNEL/!_KERNEL */
 425                         break;
 426                 case XPT_SMP_IO:
 427                         smp_command_sbuf(&ccb->smpio, &sb, path_str, 79 -
 428                                          strlen(path_str), (proto_flags &
 429                                          CAM_ESMF_PRINT_FULL_CMD) ? 79 : 0);
 430                         break;
 431                 case XPT_NVME_IO:
 432                 case XPT_NVME_ADMIN:
 433                         nvme_command_sbuf(&ccb->nvmeio, &sb);
 434                         break;
 435                 default:
 436                         sbuf_printf(&sb, "CAM func %#x",
 437                             ccb->ccb_h.func_code);
 438                         break;
 439                 }
 440                 sbuf_printf(&sb, "\n");
 441         }
 442
 443         if (flags & CAM_ESF_CAM_STATUS) {
 444                 cam_status status;
 445                 const struct cam_status_entry *entry;
 446
 447                 sbuf_cat(&sb, path_str);
 448
 449                 status = ccb->ccb_h.status & CAM_STATUS_MASK;
 450
 451                 entry = cam_fetch_status_entry(status);
 452
 453                 if (entry == NULL)
 454                         sbuf_printf(&sb, "CAM status: Unknown (%#x)\n",
 455                                     ccb->ccb_h.status);
 456                 else
 457                         sbuf_printf(&sb, "CAM status: %s\n",
 458                                     entry->status_text);
 459         }
 460
 461         if (flags & CAM_ESF_PROTO_STATUS) {
 462
 463                 switch (ccb->ccb_h.func_code) {
 464                 case XPT_ATA_IO:
 465                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
 466                              CAM_ATA_STATUS_ERROR)
 467                                 break;
 468                         if (proto_flags & CAM_EAF_PRINT_STATUS) {
 469                                 sbuf_cat(&sb, path_str);
 470                                 ata_status_sbuf(&ccb->ataio, &sb);
 471                                 sbuf_printf(&sb, "\n");
 472                         }
 473                         if (proto_flags & CAM_EAF_PRINT_RESULT) {
 474                                 sbuf_cat(&sb, path_str);
 475                                 sbuf_printf(&sb, "RES: ");
 476                                 ata_res_sbuf(&ccb->ataio.res, &sb);
 477                                 sbuf_printf(&sb, "\n");
 478                         }
 479
 480                         break;
 481                 case XPT_SCSI_IO:
 482                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
 483                              CAM_SCSI_STATUS_ERROR)
 484                                 break;
 485
 486                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
 487                                 sbuf_cat(&sb, path_str);
 488                                 sbuf_printf(&sb, "SCSI status: %s\n",
 489                                             scsi_status_string(&ccb->csio));
 490                         }
 491
 492                         if ((proto_flags & CAM_ESF_PRINT_SENSE)
 493                          && (ccb->csio.scsi_status == SCSI_STATUS_CHECK_COND)
 494                          && (ccb->ccb_h.status & CAM_AUTOSNS_VALID)) {
 495
 496 #ifdef _KERNEL
 497                                 scsi_sense_sbuf(&ccb->csio, &sb,
 498                                                 SSS_FLAG_NONE);
 499 #else /* !_KERNEL */
 500                                 scsi_sense_sbuf(device, &ccb->csio, &sb,
 501                                                 SSS_FLAG_NONE);
 502 #endif /* _KERNEL/!_KERNEL */
 503                         }
 504                         break;
 505                 case XPT_SMP_IO:
 506                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
 507                              CAM_SMP_STATUS_ERROR)
 508                                 break;
 509
 510                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
 511                                 sbuf_cat(&sb, path_str);
 512                                 sbuf_printf(&sb, "SMP status: %s (%#x)\n",
 513                                     smp_error_desc(ccb->smpio.smp_response[2]),
 514                                                    ccb->smpio.smp_response[2]);
 515                         }
 516                         /* There is no SMP equivalent to SCSI sense. */
 517                         break;
 518                 default:
 519                         break;
 520                 }
 521         }
 522
 523         sbuf_finish(&sb);
 524
 525         return(sbuf_data(&sb));
 526 }
 527
 528 #ifdef _KERNEL
 529
 530 void
 531 cam_error_print(union ccb *ccb, cam_error_string_flags flags,
 532                 cam_error_proto_flags proto_flags)
 533 {
 534         char str[512];
 535
 536         printf("%s", cam_error_string(ccb, str, sizeof(str), flags,
 537                proto_flags));
 538 }
 539
 540 #else /* !_KERNEL */
 541
 542 void
 543 cam_error_print(struct cam_device *device, union ccb *ccb,
 544                 cam_error_string_flags flags, cam_error_proto_flags proto_flags,
 545                 FILE *ofile)
 546 {
 547         char str[512];
 548
 549         if ((device == NULL) || (ccb == NULL) || (ofile == NULL))
 550                 return;
 551
 552         fprintf(ofile, "%s", cam_error_string(device, ccb, str, sizeof(str),
 553                 flags, proto_flags));
 554 }
 555
 556 #endif /* _KERNEL/!_KERNEL */
 557
 558 /*
 559  * Common calculate geometry fuction
 560  *
 561  * Caller should set ccg->volume_size and block_size.
 562  * The extended parameter should be zero if extended translation
 563  * should not be used.
 564  */
 565 void
 566 cam_calc_geometry(struct ccb_calc_geometry *ccg, int extended)
 567 {
 568         uint32_t size_mb, secs_per_cylinder;
 569
 570         if (ccg->block_size == 0) {
 571                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
 572                 return;
 573         }
 574         size_mb = (1024L * 1024L) / ccg->block_size;
 575         if (size_mb == 0) {
 576                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
 577                 return;
 578         }
 579         size_mb = ccg->volume_size / size_mb;
 580         if (size_mb > 1024 && extended) {
 581                 ccg->heads = 255;
 582                 ccg->secs_per_track = 63;
 583         } else {
 584                 ccg->heads = 64;
 585                 ccg->secs_per_track = 32;
 586         }
 587         secs_per_cylinder = ccg->heads * ccg->secs_per_track;
 588         if (secs_per_cylinder == 0) {
 589                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
 590                 return;
 591         }
 592         ccg->cylinders = ccg->volume_size / secs_per_cylinder;
 593         ccg->ccb_h.status = CAM_REQ_CMP;
 594 }