The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/cam/cam.c

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    1 /*-
    2  * Generic utility routines for the Common Access Method layer.
    3  *
    4  * Copyright (c) 1997 Justin T. Gibbs.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions, and the following disclaimer,
   12  *    without modification, immediately at the beginning of the file.
   13  * 2. The name of the author may not be used to endorse or promote products
   14  *    derived from this software without specific prior written permission.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
   20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/11/sys/cam/cam.c 326782 2017-12-11 20:47:26Z asomers $");
   31 
   32 #include <sys/param.h>
   33 #ifdef _KERNEL
   34 #include <sys/systm.h>
   35 #include <sys/kernel.h>
   36 #include <sys/sysctl.h>
   37 #else /* _KERNEL */
   38 #include <stdlib.h>
   39 #include <stdio.h>
   40 #include <string.h>
   41 #include <camlib.h>
   42 #endif /* _KERNEL */
   43 
   44 #include <cam/cam.h>
   45 #include <cam/cam_ccb.h>
   46 #include <cam/scsi/scsi_all.h>
   47 #include <cam/scsi/smp_all.h>
   48 #include <sys/sbuf.h>
   49 
   50 #ifdef _KERNEL
   51 #include <sys/libkern.h>
   52 #include <cam/cam_queue.h>
   53 #include <cam/cam_xpt.h>
   54 
   55 FEATURE(scbus, "SCSI devices support");
   56 
   57 #endif
   58 
   59 static int      camstatusentrycomp(const void *key, const void *member);
   60 
   61 const struct cam_status_entry cam_status_table[] = {
   62         { CAM_REQ_INPROG,        "CCB request is in progress"                },
   63         { CAM_REQ_CMP,           "CCB request completed without error"       },
   64         { CAM_REQ_ABORTED,       "CCB request aborted by the host"           },
   65         { CAM_UA_ABORT,          "Unable to abort CCB request"               },
   66         { CAM_REQ_CMP_ERR,       "CCB request completed with an error"       },
   67         { CAM_BUSY,              "CAM subsystem is busy"                     },
   68         { CAM_REQ_INVALID,       "CCB request was invalid"                   },
   69         { CAM_PATH_INVALID,      "Supplied Path ID is invalid"               },
   70         { CAM_DEV_NOT_THERE,     "Device Not Present"                        },
   71         { CAM_UA_TERMIO,         "Unable to terminate I/O CCB request"       },
   72         { CAM_SEL_TIMEOUT,       "Selection Timeout"                         },
   73         { CAM_CMD_TIMEOUT,       "Command timeout"                           },
   74         { CAM_SCSI_STATUS_ERROR, "SCSI Status Error"                         },
   75         { CAM_MSG_REJECT_REC,    "Message Reject Reveived"                   },
   76         { CAM_SCSI_BUS_RESET,    "SCSI Bus Reset Sent/Received"              },
   77         { CAM_UNCOR_PARITY,      "Uncorrectable parity/CRC error"            },
   78         { CAM_AUTOSENSE_FAIL,    "Auto-Sense Retrieval Failed"               },
   79         { CAM_NO_HBA,            "No HBA Detected"                           },
   80         { CAM_DATA_RUN_ERR,      "Data Overrun error"                        },
   81         { CAM_UNEXP_BUSFREE,     "Unexpected Bus Free"                       },
   82         { CAM_SEQUENCE_FAIL,     "Target Bus Phase Sequence Failure"         },
   83         { CAM_CCB_LEN_ERR,       "CCB length supplied is inadequate"         },
   84         { CAM_PROVIDE_FAIL,      "Unable to provide requested capability"    },
   85         { CAM_BDR_SENT,          "SCSI BDR Message Sent"                     },
   86         { CAM_REQ_TERMIO,        "CCB request terminated by the host"        },
   87         { CAM_UNREC_HBA_ERROR,   "Unrecoverable Host Bus Adapter Error"      },
   88         { CAM_REQ_TOO_BIG,       "The request was too large for this host"   },
   89         { CAM_REQUEUE_REQ,       "Unconditionally Re-queue Request",         },
   90         { CAM_ATA_STATUS_ERROR,  "ATA Status Error"                          },
   91         { CAM_SCSI_IT_NEXUS_LOST,"Initiator/Target Nexus Lost"               },
   92         { CAM_SMP_STATUS_ERROR,  "SMP Status Error"                          },
   93         { CAM_IDE,               "Initiator Detected Error Message Received" },
   94         { CAM_RESRC_UNAVAIL,     "Resource Unavailable"                      },
   95         { CAM_UNACKED_EVENT,     "Unacknowledged Event by Host"              },
   96         { CAM_MESSAGE_RECV,      "Message Received in Host Target Mode"      },
   97         { CAM_INVALID_CDB,       "Invalid CDB received in Host Target Mode"  },
   98         { CAM_LUN_INVALID,       "Invalid Lun"                               },
   99         { CAM_TID_INVALID,       "Invalid Target ID"                         },
  100         { CAM_FUNC_NOTAVAIL,     "Function Not Available"                    },
  101         { CAM_NO_NEXUS,          "Nexus Not Established"                     },
  102         { CAM_IID_INVALID,       "Invalid Initiator ID"                      },
  103         { CAM_CDB_RECVD,         "CDB Received"                              },
  104         { CAM_LUN_ALRDY_ENA,     "LUN Already Enabled for Target Mode"       },
  105         { CAM_SCSI_BUSY,         "SCSI Bus Busy"                             },
  106 };
  107 
  108 #ifdef _KERNEL
  109 SYSCTL_NODE(_kern, OID_AUTO, cam, CTLFLAG_RD, 0, "CAM Subsystem");
  110 
  111 #ifndef CAM_DEFAULT_SORT_IO_QUEUES
  112 #define CAM_DEFAULT_SORT_IO_QUEUES 1
  113 #endif
  114 
  115 int cam_sort_io_queues = CAM_DEFAULT_SORT_IO_QUEUES;
  116 SYSCTL_INT(_kern_cam, OID_AUTO, sort_io_queues, CTLFLAG_RWTUN,
  117     &cam_sort_io_queues, 0, "Sort IO queues to try and optimise disk access patterns");
  118 #endif
  119 
  120 void
  121 cam_strvis(u_int8_t *dst, const u_int8_t *src, int srclen, int dstlen)
  122 {
  123 
  124         /* Trim leading/trailing spaces, nulls. */
  125         while (srclen > 0 && src[0] == ' ')
  126                 src++, srclen--;
  127         while (srclen > 0
  128             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
  129                 srclen--;
  130 
  131         while (srclen > 0 && dstlen > 1) {
  132                 u_int8_t *cur_pos = dst;
  133 
  134                 if (*src < 0x20 || *src >= 0x80) {
  135                         /* SCSI-II Specifies that these should never occur. */
  136                         /* non-printable character */
  137                         if (dstlen > 4) {
  138                                 *cur_pos++ = '\\';
  139                                 *cur_pos++ = ((*src & 0300) >> 6) + '';
  140                                 *cur_pos++ = ((*src & 0070) >> 3) + '';
  141                                 *cur_pos++ = ((*src & 0007) >> 0) + '';
  142                         } else {
  143                                 *cur_pos++ = '?';
  144                         }
  145                 } else {
  146                         /* normal character */
  147                         *cur_pos++ = *src;
  148                 }
  149                 src++;
  150                 srclen--;
  151                 dstlen -= cur_pos - dst;
  152                 dst = cur_pos;
  153         }
  154         *dst = '\0';
  155 }
  156 
  157 void
  158 cam_strvis_sbuf(struct sbuf *sb, const u_int8_t *src, int srclen,
  159                 uint32_t flags)
  160 {
  161 
  162         /* Trim leading/trailing spaces, nulls. */
  163         while (srclen > 0 && src[0] == ' ')
  164                 src++, srclen--;
  165         while (srclen > 0
  166             && (src[srclen-1] == ' ' || src[srclen-1] == '\0'))
  167                 srclen--;
  168 
  169         while (srclen > 0) {
  170                 if (*src < 0x20 || *src >= 0x80) {
  171                         /* SCSI-II Specifies that these should never occur. */
  172                         /* non-printable character */
  173                         switch (flags & CAM_STRVIS_FLAG_NONASCII_MASK) {
  174                         case CAM_STRVIS_FLAG_NONASCII_ESC:
  175                                 sbuf_printf(sb, "\\%c%c%c", 
  176                                     ((*src & 0300) >> 6) + '',
  177                                     ((*src & 0070) >> 3) + '',
  178                                     ((*src & 0007) >> 0) + '');
  179                                 break;
  180                         case CAM_STRVIS_FLAG_NONASCII_RAW:
  181                                 /*
  182                                  * If we run into a NUL, just transform it
  183                                  * into a space.
  184                                  */
  185                                 if (*src != 0x00)
  186                                         sbuf_putc(sb, *src);
  187                                 else
  188                                         sbuf_putc(sb, ' ');
  189                                 break;
  190                         case CAM_STRVIS_FLAG_NONASCII_SPC:
  191                                 sbuf_putc(sb, ' ');
  192                                 break;
  193                         case CAM_STRVIS_FLAG_NONASCII_TRIM:
  194                         default:
  195                                 break;
  196                         }
  197                 } else {
  198                         /* normal character */
  199                         sbuf_putc(sb, *src);
  200                 }
  201                 src++;
  202                 srclen--;
  203         }
  204 }
  205 
  206 
  207 /*
  208  * Compare string with pattern, returning 0 on match.
  209  * Short pattern matches trailing blanks in name,
  210  * Shell globbing rules apply: * matches 0 or more characters,
  211  * ? matchces one character, [...] denotes a set to match one char,
  212  * [^...] denotes a complimented set to match one character.
  213  * Spaces in str used to match anything in the pattern string
  214  * but was removed because it's a bug. No current patterns require
  215  * it, as far as I know, but it's impossible to know what drives
  216  * returned.
  217  *
  218  * Each '*' generates recursion, so keep the number of * in check.
  219  */
  220 int
  221 cam_strmatch(const u_int8_t *str, const u_int8_t *pattern, int str_len)
  222 {
  223 
  224         while (*pattern != '\0' && str_len > 0) {  
  225                 if (*pattern == '*') {
  226                         pattern++;
  227                         if (*pattern == '\0')
  228                                 return (0);
  229                         do {
  230                                 if (cam_strmatch(str, pattern, str_len) == 0)
  231                                         return (0);
  232                                 str++;
  233                                 str_len--;
  234                         } while (str_len > 0);
  235                         return (1);
  236                 } else if (*pattern == '[') {
  237                         int negate_range, ok;
  238                         uint8_t pc = UCHAR_MAX;
  239                         uint8_t sc;
  240 
  241                         ok = 0;
  242                         sc = *str++;
  243                         str_len--;
  244                         pattern++;
  245                         if ((negate_range = (*pattern == '^')) != 0)
  246                                 pattern++;
  247                         while ((*pattern != ']') && *pattern != '\0') {
  248                                 if (*pattern == '-') {
  249                                         if (pattern[1] == '\0') /* Bad pattern */
  250                                                 return (1);
  251                                         if (sc >= pc && sc <= pattern[1])
  252                                                 ok = 1;
  253                                         pattern++;
  254                                 } else if (*pattern == sc)
  255                                         ok = 1;
  256                                 pc = *pattern;
  257                                 pattern++;
  258                         }
  259                         if (ok == negate_range)
  260                                 return (1);
  261                         pattern++;
  262                 } else if (*pattern == '?') {
  263                         /*
  264                          * NB: || *str == ' ' of the old code is a bug and was
  265                          * removed.  If you add it back, keep this the last if
  266                          * before the naked else */
  267                         pattern++;
  268                         str++;
  269                         str_len--;
  270                 } else {
  271                         if (*str != *pattern)
  272                                 return (1);
  273                         pattern++;
  274                         str++;
  275                         str_len--;
  276                 }
  277         }
  278 
  279         /* '*' is allowed to match nothing, so gobble it */
  280         while (*pattern == '*')
  281                 pattern++;
  282 
  283         if ( *pattern != '\0') {
  284                 /* Pattern not fully consumed.  Not a match */
  285                 return (1);
  286         }
  287 
  288         /* Eat trailing spaces, which get added by SAT */
  289         while (str_len > 0 && *str == ' ') {
  290                 str++;
  291                 str_len--;
  292         }
  293 
  294         return (str_len);
  295 }
  296 
  297 caddr_t
  298 cam_quirkmatch(caddr_t target, caddr_t quirk_table, int num_entries,
  299                int entry_size, cam_quirkmatch_t *comp_func)
  300 {
  301         for (; num_entries > 0; num_entries--, quirk_table += entry_size) {
  302                 if ((*comp_func)(target, quirk_table) == 0)
  303                         return (quirk_table);
  304         }
  305         return (NULL);
  306 }
  307 
  308 const struct cam_status_entry*
  309 cam_fetch_status_entry(cam_status status)
  310 {
  311         status &= CAM_STATUS_MASK;
  312         return (bsearch(&status, &cam_status_table,
  313                         nitems(cam_status_table),
  314                         sizeof(*cam_status_table),
  315                         camstatusentrycomp));
  316 }
  317 
  318 static int
  319 camstatusentrycomp(const void *key, const void *member)
  320 {
  321         cam_status status;
  322         const struct cam_status_entry *table_entry;
  323 
  324         status = *(const cam_status *)key;
  325         table_entry = (const struct cam_status_entry *)member;
  326 
  327         return (status - table_entry->status_code);
  328 }
  329 
  330 
  331 #ifdef _KERNEL
  332 char *
  333 cam_error_string(union ccb *ccb, char *str, int str_len,
  334                  cam_error_string_flags flags,
  335                  cam_error_proto_flags proto_flags)
  336 #else /* !_KERNEL */
  337 char *
  338 cam_error_string(struct cam_device *device, union ccb *ccb, char *str,
  339                  int str_len, cam_error_string_flags flags,
  340                  cam_error_proto_flags proto_flags)
  341 #endif /* _KERNEL/!_KERNEL */
  342 {
  343         char path_str[64];
  344         struct sbuf sb;
  345 
  346         if ((ccb == NULL)
  347          || (str == NULL)
  348          || (str_len <= 0))
  349                 return(NULL);
  350 
  351         if (flags == CAM_ESF_NONE)
  352                 return(NULL);
  353 
  354         switch (ccb->ccb_h.func_code) {
  355                 case XPT_ATA_IO:
  356                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
  357                         case CAM_EPF_NONE:
  358                                 break;
  359                         case CAM_EPF_ALL:
  360                         case CAM_EPF_NORMAL:
  361                                 proto_flags |= CAM_EAF_PRINT_RESULT;
  362                                 /* FALLTHROUGH */
  363                         case CAM_EPF_MINIMAL:
  364                                 proto_flags |= CAM_EAF_PRINT_STATUS;
  365                                 /* FALLTHROUGH */
  366                         default:
  367                                 break;
  368                         }
  369                         break;
  370                 case XPT_SCSI_IO:
  371                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
  372                         case CAM_EPF_NONE:
  373                                 break;
  374                         case CAM_EPF_ALL:
  375                         case CAM_EPF_NORMAL:
  376                                 proto_flags |= CAM_ESF_PRINT_SENSE;
  377                                 /* FALLTHROUGH */
  378                         case CAM_EPF_MINIMAL:
  379                                 proto_flags |= CAM_ESF_PRINT_STATUS;
  380                                 /* FALLTHROUGH */
  381                         default:
  382                                 break;
  383                         }
  384                         break;
  385                 case XPT_SMP_IO:
  386                         switch (proto_flags & CAM_EPF_LEVEL_MASK) {
  387                         case CAM_EPF_NONE:
  388                                 break;
  389                         case CAM_EPF_ALL:
  390                                 proto_flags |= CAM_ESMF_PRINT_FULL_CMD;
  391                                 /* FALLTHROUGH */
  392                         case CAM_EPF_NORMAL:
  393                         case CAM_EPF_MINIMAL:
  394                                 proto_flags |= CAM_ESMF_PRINT_STATUS;
  395                                 /* FALLTHROUGH */
  396                         default:
  397                                 break;
  398                         }
  399                         break;
  400                 default:
  401                         break;
  402         }
  403 #ifdef _KERNEL
  404         xpt_path_string(ccb->csio.ccb_h.path, path_str, sizeof(path_str));
  405 #else /* !_KERNEL */
  406         cam_path_string(device, path_str, sizeof(path_str));
  407 #endif /* _KERNEL/!_KERNEL */
  408 
  409         sbuf_new(&sb, str, str_len, 0);
  410 
  411         if (flags & CAM_ESF_COMMAND) {
  412                 sbuf_cat(&sb, path_str);
  413                 switch (ccb->ccb_h.func_code) {
  414                 case XPT_ATA_IO:
  415                         ata_command_sbuf(&ccb->ataio, &sb);
  416                         sbuf_printf(&sb, "\n");
  417                         break;
  418                 case XPT_SCSI_IO:
  419 #ifdef _KERNEL
  420                         scsi_command_string(&ccb->csio, &sb);
  421 #else /* !_KERNEL */
  422                         scsi_command_string(device, &ccb->csio, &sb);
  423 #endif /* _KERNEL/!_KERNEL */
  424                         sbuf_printf(&sb, "\n");
  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                         sbuf_printf(&sb, "\n");
  431                         break;
  432                 default:
  433                         break;
  434                 }
  435         }
  436 
  437         if (flags & CAM_ESF_CAM_STATUS) {
  438                 cam_status status;
  439                 const struct cam_status_entry *entry;
  440 
  441                 sbuf_cat(&sb, path_str);
  442   
  443                 status = ccb->ccb_h.status & CAM_STATUS_MASK;
  444 
  445                 entry = cam_fetch_status_entry(status);
  446 
  447                 if (entry == NULL)
  448                         sbuf_printf(&sb, "CAM status: Unknown (%#x)\n",
  449                                     ccb->ccb_h.status);
  450                 else
  451                         sbuf_printf(&sb, "CAM status: %s\n",
  452                                     entry->status_text);
  453         }
  454 
  455         if (flags & CAM_ESF_PROTO_STATUS) {
  456   
  457                 switch (ccb->ccb_h.func_code) {
  458                 case XPT_ATA_IO:
  459                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
  460                              CAM_ATA_STATUS_ERROR)
  461                                 break;
  462                         if (proto_flags & CAM_EAF_PRINT_STATUS) {
  463                                 sbuf_cat(&sb, path_str);
  464                                 ata_status_sbuf(&ccb->ataio, &sb);
  465                                 sbuf_printf(&sb, "\n");
  466                         }
  467                         if (proto_flags & CAM_EAF_PRINT_RESULT) {
  468                                 sbuf_cat(&sb, path_str);
  469                                 sbuf_printf(&sb, "RES: ");
  470                                 ata_res_sbuf(&ccb->ataio.res, &sb);
  471                                 sbuf_printf(&sb, "\n");
  472                         }
  473 
  474                         break;
  475                 case XPT_SCSI_IO:
  476                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
  477                              CAM_SCSI_STATUS_ERROR)
  478                                 break;
  479 
  480                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
  481                                 sbuf_cat(&sb, path_str);
  482                                 sbuf_printf(&sb, "SCSI status: %s\n",
  483                                             scsi_status_string(&ccb->csio));
  484                         }
  485 
  486                         if ((proto_flags & CAM_ESF_PRINT_SENSE)
  487                          && (ccb->csio.scsi_status == SCSI_STATUS_CHECK_COND)
  488                          && (ccb->ccb_h.status & CAM_AUTOSNS_VALID)) {
  489 
  490 #ifdef _KERNEL
  491                                 scsi_sense_sbuf(&ccb->csio, &sb,
  492                                                 SSS_FLAG_NONE);
  493 #else /* !_KERNEL */
  494                                 scsi_sense_sbuf(device, &ccb->csio, &sb,
  495                                                 SSS_FLAG_NONE);
  496 #endif /* _KERNEL/!_KERNEL */
  497                         }
  498                         break;
  499                 case XPT_SMP_IO:
  500                         if ((ccb->ccb_h.status & CAM_STATUS_MASK) !=
  501                              CAM_SMP_STATUS_ERROR)
  502                                 break;
  503 
  504                         if (proto_flags & CAM_ESF_PRINT_STATUS) {
  505                                 sbuf_cat(&sb, path_str);
  506                                 sbuf_printf(&sb, "SMP status: %s (%#x)\n",
  507                                     smp_error_desc(ccb->smpio.smp_response[2]),
  508                                                    ccb->smpio.smp_response[2]);
  509                         }
  510                         /* There is no SMP equivalent to SCSI sense. */
  511                         break;
  512                 default:
  513                         break;
  514                 }
  515         }
  516 
  517         sbuf_finish(&sb);
  518 
  519         return(sbuf_data(&sb));
  520 }
  521 
  522 #ifdef _KERNEL
  523 
  524 void
  525 cam_error_print(union ccb *ccb, cam_error_string_flags flags,
  526                 cam_error_proto_flags proto_flags)
  527 {
  528         char str[512];
  529 
  530         printf("%s", cam_error_string(ccb, str, sizeof(str), flags,
  531                proto_flags));
  532 }
  533 
  534 #else /* !_KERNEL */
  535 
  536 void
  537 cam_error_print(struct cam_device *device, union ccb *ccb,
  538                 cam_error_string_flags flags, cam_error_proto_flags proto_flags,
  539                 FILE *ofile)
  540 {
  541         char str[512];
  542 
  543         if ((device == NULL) || (ccb == NULL) || (ofile == NULL))
  544                 return;
  545 
  546         fprintf(ofile, "%s", cam_error_string(device, ccb, str, sizeof(str),
  547                 flags, proto_flags));
  548 }
  549 
  550 #endif /* _KERNEL/!_KERNEL */
  551 
  552 /*
  553  * Common calculate geometry fuction
  554  *
  555  * Caller should set ccg->volume_size and block_size.
  556  * The extended parameter should be zero if extended translation
  557  * should not be used.
  558  */
  559 void
  560 cam_calc_geometry(struct ccb_calc_geometry *ccg, int extended)
  561 {
  562         uint32_t size_mb, secs_per_cylinder;
  563 
  564         if (ccg->block_size == 0) {
  565                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
  566                 return;
  567         }
  568         size_mb = (1024L * 1024L) / ccg->block_size;
  569         if (size_mb == 0) {
  570                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
  571                 return;
  572         }
  573         size_mb = ccg->volume_size / size_mb;
  574         if (size_mb > 1024 && extended) {
  575                 ccg->heads = 255;
  576                 ccg->secs_per_track = 63;
  577         } else {
  578                 ccg->heads = 64;
  579                 ccg->secs_per_track = 32;
  580         }
  581         secs_per_cylinder = ccg->heads * ccg->secs_per_track;
  582         if (secs_per_cylinder == 0) {
  583                 ccg->ccb_h.status = CAM_REQ_CMP_ERR;
  584                 return;
  585         }
  586         ccg->cylinders = ccg->volume_size / secs_per_cylinder;
  587         ccg->ccb_h.status = CAM_REQ_CMP;
  588 }

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