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 | CTLFLAG_MPSAFE, 0,
 112     "CAM Subsystem");
 113
 114 #ifndef CAM_DEFAULT_SORT_IO_QUEUES
 115 #define CAM_DEFAULT_SORT_IO_QUEUES 1
 116 #endif
 117
 118 int cam_sort_io_queues = CAM_DEFAULT_SORT_IO_QUEUES;
 119 SYSCTL_INT(_kern_cam, OID_AUTO, sort_io_queues, CTLFLAG_RWTUN,
 120     &cam_sort_io_queues, 0, "Sort IO queues to try and optimise disk access patterns");
 121 #endif
 122
 123 void
 124 cam_strvis(u_int8_t *dst, const u_int8_t *src, int srclen, int dstlen)
 125 {
 126
 127         /* Trim leading/trailing spaces, nulls. */
 128         while (srclen > 0 && src[0] == ' ')
 129                 src++, srclen--;
 130         while (srclen > 0
 131             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
 132                 srclen--;
 133
 134         while (srclen > 0 && dstlen > 1) {
 135                 u_int8_t *cur_pos = dst;
 136
 137                 if (*src < 0x20 || *src >= 0x80) {
 138                         /* SCSI-II Specifies that these should never occur. */
 139                         /* non-printable character */
 140                         if (dstlen > 4) {
 141                                 *cur_pos++ = '\\';
 142                                 *cur_pos++ = ((*src & 0300) >> 6) + '0';
 143                                 *cur_pos++ = ((*src & 0070) >> 3) + '0';
 144                                 *cur_pos++ = ((*src & 0007) >> 0) + '0';
 145                         } else {
 146                                 *cur_pos++ = '?';
 147                         }
 148                 } else {
 149                         /* normal character */
 150                         *cur_pos++ = *src;
 151                 }
 152                 src++;
 153                 srclen--;
 154                 dstlen -= cur_pos - dst;
 155                 dst = cur_pos;
 156         }
 157         *dst = '\0';
 158 }
 159
 160 void
 161 cam_strvis_sbuf(struct sbuf *sb, const u_int8_t *src, int srclen,
 162                 uint32_t flags)
 163 {
 164
 165         /* Trim leading/trailing spaces, nulls. */
 166         while (srclen > 0 && src[0] == ' ')
 167                 src++, srclen--;
 168         while (srclen > 0
 169             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
 170                 srclen--;
 171
 172         while (srclen > 0) {
 173                 if (*src < 0x20 || *src >= 0x80) {
 174                         /* SCSI-II Specifies that these should never occur. */
 175                         /* non-printable character */
 176                         switch (flags & CAM_STRVIS_FLAG_NONASCII_MASK) {
 177                         case CAM_STRVIS_FLAG_NONASCII_ESC:
 178                                 sbuf_printf(sb, "\\%c%c%c",
 179                                     ((*src & 0300) >> 6) + '0',
 180                                     ((*src & 0070) >> 3) + '0',
 181                                     ((*src & 0007) >> 0) + '0');
 182                                 break;
 183                         case CAM_STRVIS_FLAG_NONASCII_RAW:
 184                                 /*
 185                                  * If we run into a NUL, just transform it
 186                                  * into a space.
 187                                  */
 188                                 if (*src != 0x00)
 189                                         sbuf_putc(sb, *src);
 190                                 else
 191                                         sbuf_putc(sb, ' ');
 192                                 break;
 193                         case CAM_STRVIS_FLAG_NONASCII_SPC:
 194                                 sbuf_putc(sb, ' ');
 195                                 break;
 196                         case CAM_STRVIS_FLAG_NONASCII_TRIM:
 197                         default:
 198                                 break;
 199                         }
 200                 } else {
 201                         /* normal character */
 202                         sbuf_putc(sb, *src);
 203                 }
 204                 src++;
 205                 srclen--;
 206         }
 207 }
 208
 209
 210 /*
 211  * Compare string with pattern, returning 0 on match.
 212  * Short pattern matches trailing blanks in name,
 213  * Shell globbing rules apply: * matches 0 or more characters,
 214  * ? matchces one character, [...] denotes a set to match one char,
 215  * [^...] denotes a complimented set to match one character.
 216  * Spaces in str used to match anything in the pattern string
 217  * but was removed because it's a bug. No current patterns require
 218  * it, as far as I know, but it's impossible to know what drives
 219  * returned.
 220  *
 221  * Each '*' generates recursion, so keep the number of * in check.
 222  */
 223 int
 224 cam_strmatch(const u_int8_t *str, const u_int8_t *pattern, int str_len)
 225 {
 226
 227         while (*pattern != '\0' && str_len > 0) {
 228                 if (*pattern == '*') {
 229                         pattern++;
 230                         if (*pattern == '\0')
 231                                 return (0);
 232                         do {
 233                                 if (cam_strmatch(str, pattern, str_len) == 0)
 234                                         return (0);
 235                                 str++;
 236                                 str_len--;
 237                         } while (str_len > 0);
 238                         return (1);
 239                 } else if (*pattern == '[') {
 240                         int negate_range, ok;
 241                         uint8_t pc = UCHAR_MAX;
 242                         uint8_t sc;
 243
 244                         ok = 0;
 245                         sc = *str++;
 246                         str_len--;
 247                         pattern++;
 248                         if ((negate_range = (*pattern == '^')) != 0)
 249                                 pattern++;
 250                         while ((*pattern != ']') && *pattern != '\0') {
 251                                 if (*pattern == '-') {
 252                                         if (pattern[1] == '\0') /* Bad pattern */
 253                                                 return (1);
 254                                         if (sc >= pc && sc <= pattern[1])
 255                                                 ok = 1;
 256                                         pattern++;
 257                                 } else if (*pattern == sc)
 258                                         ok = 1;
 259                                 pc = *pattern;
 260                                 pattern++;
 261                         }
 262                         if (ok == negate_range)
 263                                 return (1);
 264                         pattern++;
 265                 } else if (*pattern == '?') {
 266                         /*
 267                          * NB: || *str == ' ' of the old code is a bug and was
 268                          * removed.  If you add it back, keep this the last if
 269                          * before the naked else */
 270                         pattern++;
 271                         str++;
 272                         str_len--;
 273                 } else {
 274                         if (*str != *pattern)
 275                                 return (1);
 276                         pattern++;
 277                         str++;
 278                         str_len--;
 279                 }
 280         }
 281
 282         /* '*' is allowed to match nothing, so gobble it */
 283         while (*pattern == '*')
 284                 pattern++;
 285
 286         if ( *pattern != '\0') {
 287                 /* Pattern not fully consumed.  Not a match */
 288                 return (1);
 289         }
 290
 291         /* Eat trailing spaces, which get added by SAT */
 292         while (str_len > 0 && *str == ' ') {
 293                 str++;
 294                 str_len--;
 295         }
 296
 297         return (str_len);
 298 }
 299
 300 caddr_t
 301 cam_quirkmatch(caddr_t target, caddr_t quirk_table, int num_entries,
 302                int entry_size, cam_quirkmatch_t *comp_func)
 303 {
 304         for (; num_entries > 0; num_entries--, quirk_table += entry_size) {
 305                 if ((*comp_func)(target, quirk_table) == 0)
 306                         return (quirk_table);
 307         }
 308         return (NULL);
 309 }
 310
 311 const struct cam_status_entry*
 312 cam_fetch_status_entry(cam_status status)
 313 {
 314         status &= CAM_STATUS_MASK;
 315         return (bsearch(&status, &cam_status_table,
 316                         nitems(cam_status_table),
 317                         sizeof(*cam_status_table),
 318                         camstatusentrycomp));
 319 }
 320
 321 static int
 322 camstatusentrycomp(const void *key, const void *member)
 323 {
 324         cam_status status;
 325         const struct cam_status_entry *table_entry;
 326
 327         status = *(const cam_status *)key;
 328         table_entry = (const struct cam_status_entry *)member;
 329
 330         return (status - table_entry->status_code);
 331 }
 332
 333
 334 #ifdef _KERNEL
 335 char *
 336 cam_error_string(union ccb *ccb, char *str, int str_len,
 337                  cam_error_string_flags flags,
 338                  cam_error_proto_flags proto_flags)
 339 #else /* !_KERNEL */
 340 char *
 341 cam_error_string(struct cam_device *device, union ccb *ccb, char *str,
 342                  int str_len, cam_error_string_flags flags,
 343                  cam_error_proto_flags proto_flags)
 344 #endif /* _KERNEL/!_KERNEL */
 345 {
 346         char path_str[64];
 347         struct sbuf sb;
 348
 349         if ((ccb == NULL)
 350          || (str == NULL)
 351          || (str_len <= 0))
 352                 return(NULL);
 353
 354         if (flags == CAM_ESF_NONE)
 355                 return(NULL);
 356
 357         switch (ccb->ccb_h.func_code) {
 358                 case XPT_ATA_IO:
 359                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
 360                         case CAM_EPF_NONE:
 361                                 break;
 362                         case CAM_EPF_ALL:
 363                         case CAM_EPF_NORMAL:
 364                                 proto_flags |= CAM_EAF_PRINT_RESULT;
 365                                 /* FALLTHROUGH */
 366                         case CAM_EPF_MINIMAL:
 367                                 proto_flags |= CAM_EAF_PRINT_STATUS;
 368                                 /* FALLTHROUGH */
 369                         default:
 370                                 break;
 371                         }
 372                         break;
 373                 case XPT_SCSI_IO:
 374                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
 375                         case CAM_EPF_NONE:
 376                                 break;
 377                         case CAM_EPF_ALL:
 378                         case CAM_EPF_NORMAL:
 379                                 proto_flags |= CAM_ESF_PRINT_SENSE;
 380                                 /* FALLTHROUGH */
 381                         case CAM_EPF_MINIMAL:
 382                                 proto_flags |= CAM_ESF_PRINT_STATUS;
 383                                 /* FALLTHROUGH */
 384                         default:
 385                                 break;
 386                         }
 387                         break;
 388                 case XPT_SMP_IO:
 389                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
 390                         case CAM_EPF_NONE:
 391                                 break;
 392                         case CAM_EPF_ALL:
 393                                 proto_flags |= CAM_ESMF_PRINT_FULL_CMD;
 394                                 /* FALLTHROUGH */
 395                         case CAM_EPF_NORMAL:
 396                         case CAM_EPF_MINIMAL:
 397                                 proto_flags |= CAM_ESMF_PRINT_STATUS;
 398                                 /* FALLTHROUGH */
 399                         default:
 400                                 break;
 401                         }
 402                         break;
 403                 default:
 404                         break;
 405         }
 406 #ifdef _KERNEL
 407         xpt_path_string(ccb->csio.ccb_h.path, path_str, sizeof(path_str));
 408 #else /* !_KERNEL */
 409         cam_path_string(device, path_str, sizeof(path_str));
 410 #endif /* _KERNEL/!_KERNEL */
 411
 412         sbuf_new(&sb, str, str_len, 0);
 413
 414         if (flags & CAM_ESF_COMMAND) {
 415                 sbuf_cat(&sb, path_str);
 416                 switch (ccb->ccb_h.func_code) {
 417                 case XPT_ATA_IO:
 418                         ata_command_sbuf(&ccb->ataio, &sb);
 419                         break;
 420                 case XPT_SCSI_IO:
 421 #ifdef _KERNEL
 422                         scsi_command_string(&ccb->csio, &sb);
 423 #else /* !_KERNEL */
 424                         scsi_command_string(device, &ccb->csio, &sb);
 425 #endif /* _KERNEL/!_KERNEL */
 426                         break;
 427                 case XPT_SMP_IO:
 428                         smp_command_sbuf(&ccb->smpio, &sb, path_str, 79 -
 429                                          strlen(path_str), (proto_flags &
 430                                          CAM_ESMF_PRINT_FULL_CMD) ? 79 : 0);
 431                         break;
 432                 case XPT_NVME_IO:
 433                 case XPT_NVME_ADMIN:
 434                         nvme_command_sbuf(&ccb->nvmeio, &sb);
 435                         break;
 436                 default:
 437                         sbuf_printf(&sb, "CAM func %#x",
 438                             ccb->ccb_h.func_code);
 439                         break;
 440                 }
 441                 sbuf_printf(&sb, "\n");
 442         }
 443
 444         if (flags & CAM_ESF_CAM_STATUS) {
 445                 cam_status status;
 446                 const struct cam_status_entry *entry;
 447
 448                 sbuf_cat(&sb, path_str);
 449
 450                 status = ccb->ccb_h.status & CAM_STATUS_MASK;
 451
 452                 entry = cam_fetch_status_entry(status);
 453
 454                 if (entry == NULL)
 455                         sbuf_printf(&sb, "CAM status: Unknown (%#x)\n",
 456                                     ccb->ccb_h.status);
 457                 else
 458                         sbuf_printf(&sb, "CAM status: %s\n",
 459                                     entry->status_text);
 460         }
 461
 462         if (flags & CAM_ESF_PROTO_STATUS) {
 463
 464                 switch (ccb->ccb_h.func_code) {
 465                 case XPT_ATA_IO:
 466                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
 467                              CAM_ATA_STATUS_ERROR)
 468                                 break;
 469                         if (proto_flags & CAM_EAF_PRINT_STATUS) {
 470                                 sbuf_cat(&sb, path_str);
 471                                 ata_status_sbuf(&ccb->ataio, &sb);
 472                                 sbuf_printf(&sb, "\n");
 473                         }
 474                         if (proto_flags & CAM_EAF_PRINT_RESULT) {
 475                                 sbuf_cat(&sb, path_str);
 476                                 sbuf_printf(&sb, "RES: ");
 477                                 ata_res_sbuf(&ccb->ataio.res, &sb);
 478                                 sbuf_printf(&sb, "\n");
 479                         }
 480
 481                         break;
 482                 case XPT_SCSI_IO:
 483                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
 484                              CAM_SCSI_STATUS_ERROR)
 485                                 break;
 486
 487                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
 488                                 sbuf_cat(&sb, path_str);
 489                                 sbuf_printf(&sb, "SCSI status: %s\n",
 490                                             scsi_status_string(&ccb->csio));
 491                         }
 492
 493                         if ((proto_flags & CAM_ESF_PRINT_SENSE)
 494                          && (ccb->csio.scsi_status == SCSI_STATUS_CHECK_COND)
 495                          && (ccb->ccb_h.status & CAM_AUTOSNS_VALID)) {
 496
 497 #ifdef _KERNEL
 498                                 scsi_sense_sbuf(&ccb->csio, &sb,
 499                                                 SSS_FLAG_NONE);
 500 #else /* !_KERNEL */
 501                                 scsi_sense_sbuf(device, &ccb->csio, &sb,
 502                                                 SSS_FLAG_NONE);
 503 #endif /* _KERNEL/!_KERNEL */
 504                         }
 505                         break;
 506                 case XPT_SMP_IO:
 507                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
 508                              CAM_SMP_STATUS_ERROR)
 509                                 break;
 510
 511                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
 512                                 sbuf_cat(&sb, path_str);
 513                                 sbuf_printf(&sb, "SMP status: %s (%#x)\n",
 514                                     smp_error_desc(ccb->smpio.smp_response[2]),
 515                                                    ccb->smpio.smp_response[2]);
 516                         }
 517                         /* There is no SMP equivalent to SCSI sense. */
 518                         break;
 519                 default:
 520                         break;
 521                 }
 522         }
 523
 524         sbuf_finish(&sb);
 525
 526         return(sbuf_data(&sb));
 527 }
 528
 529 #ifdef _KERNEL
 530
 531 void
 532 cam_error_print(union ccb *ccb, cam_error_string_flags flags,
 533                 cam_error_proto_flags proto_flags)
 534 {
 535         char str[512];
 536
 537         printf("%s", cam_error_string(ccb, str, sizeof(str), flags,
 538                proto_flags));
 539 }
 540
 541 #else /* !_KERNEL */
 542
 543 void
 544 cam_error_print(struct cam_device *device, union ccb *ccb,
 545                 cam_error_string_flags flags, cam_error_proto_flags proto_flags,
 546                 FILE *ofile)
 547 {
 548         char str[512];
 549
 550         if ((device == NULL) || (ccb == NULL) || (ofile == NULL))
 551                 return;
 552
 553         fprintf(ofile, "%s", cam_error_string(device, ccb, str, sizeof(str),
 554                 flags, proto_flags));
 555 }
 556
 557 #endif /* _KERNEL/!_KERNEL */
 558
 559 /*
 560  * Common calculate geometry fuction
 561  *
 562  * Caller should set ccg->volume_size and block_size.
 563  * The extended parameter should be zero if extended translation
 564  * should not be used.
 565  */
 566 void
 567 cam_calc_geometry(struct ccb_calc_geometry *ccg, int extended)
 568 {
 569         uint32_t size_mb, secs_per_cylinder;
 570
 571         if (ccg->block_size == 0) {
 572                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
 573                 return;
 574         }
 575         size_mb = (1024L * 1024L) / ccg->block_size;
 576         if (size_mb == 0) {
 577                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
 578                 return;
 579         }
 580         size_mb = ccg->volume_size / size_mb;
 581         if (size_mb > 1024 && extended) {
 582                 ccg->heads = 255;
 583                 ccg->secs_per_track = 63;
 584         } else {
 585                 ccg->heads = 64;
 586                 ccg->secs_per_track = 32;
 587         }
 588         secs_per_cylinder = ccg->heads * ccg->secs_per_track;
 589         if (secs_per_cylinder == 0) {
 590                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
 591                 return;
 592         }
 593         ccg->cylinders = ccg->volume_size / secs_per_cylinder;
 594         ccg->ccb_h.status = CAM_REQ_CMP;
 595 }