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225 lines
4.3 KiB
C
225 lines
4.3 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $Id: rules.c,v 1.3 1995/04/29 07:21:12 phk Exp $
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/diskslice.h>
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#include <sys/disklabel.h>
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#include <err.h>
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#include "libdisk.h"
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int
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Track_Aligned(struct disk *d, u_long offset)
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{
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if (!d->bios_sect)
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return 1;
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if (offset % d->bios_sect)
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return 0;
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return 1;
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}
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u_long
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Prev_Track_Aligned(struct disk *d, u_long offset)
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{
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if (!d->bios_sect)
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return offset;
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return (offset / d->bios_sect) * d->bios_sect;
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}
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u_long
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Next_Track_Aligned(struct disk *d, u_long offset)
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{
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if (!d->bios_sect)
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return offset;
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return Prev_Track_Aligned(d,offset + d->bios_sect);
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}
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int
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Cyl_Aligned(struct disk *d, u_long offset)
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{
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if (!d->bios_sect || !d->bios_hd)
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return 1;
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if (offset % (d->bios_sect * d->bios_hd))
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return 0;
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return 1;
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}
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u_long
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Prev_Cyl_Aligned(struct disk *d, u_long offset)
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{
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if (!d->bios_sect || !d->bios_hd)
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return offset;
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return (offset / (d->bios_sect*d->bios_hd)) * d->bios_sect * d->bios_hd;
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}
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u_long
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Next_Cyl_Aligned(struct disk *d, u_long offset)
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{
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if (!d->bios_sect || !d->bios_hd)
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return offset;
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return Prev_Cyl_Aligned(d,offset + (d->bios_sect * d->bios_hd));
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}
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/*
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* Rule#0:
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* Chunks of type 'whole' can have max NDOSPART children.
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*/
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void
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Rule_000(struct disk *d, struct chunk *c, char *msg)
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{
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int i;
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struct chunk *c1;
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if (c->type != whole)
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return;
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for (i=0, c1=c->part; c1; c1=c1->next) {
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if (c1->type != reserved)
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continue;
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if (c1->type != reserved)
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continue;
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i++;
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}
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if (i <= NDOSPART)
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return;
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sprintf(msg+strlen(msg),
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"%d is too many children of the 'whole' chunk. Max is %d\n",
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i, NDOSPART);
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}
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/*
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* Rule#1:
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* All children of 'whole' must be track-aligned.
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* Exception: the end can be unaligned if it matches the end of 'whole'
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*/
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void
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Rule_001(struct disk *d, struct chunk *c, char *msg)
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{
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int i;
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struct chunk *c1;
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if (c->type != whole)
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return;
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for (i=0, c1=c->part; c1; c1=c1->next) {
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if (c1->type == reserved)
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continue;
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if (c1->type == unused)
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continue;
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if (!Track_Aligned(d,c1->offset))
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sprintf(msg+strlen(msg),
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"chunk '%s' [%ld..%ld] does not start on a track boundary\n",
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c1->name,c1->offset,c1->end);
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if (c->end != c1->end && !Cyl_Aligned(d,c1->end+1))
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sprintf(msg+strlen(msg),
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"chunk '%s' [%ld..%ld] does not end on a cylinder boundary\n",
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c1->name,c1->offset,c1->end);
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}
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}
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/*
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* Rule#2:
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* Max one 'fat' as child of 'whole'
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*/
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void
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Rule_002(struct disk *d, struct chunk *c, char *msg)
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{
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int i;
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struct chunk *c1;
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if (c->type != whole)
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return;
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for (i=0, c1=c->part; c1; c1=c1->next) {
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if (c1->type != fat)
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continue;
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i++;
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}
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if (i > 1) {
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sprintf(msg+strlen(msg),
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"Max one 'fat' allowed as child of 'whole'\n");
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}
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}
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/*
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* Rule#3:
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* Max one extended as child of 'whole'
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*/
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void
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Rule_003(struct disk *d, struct chunk *c, char *msg)
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{
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int i;
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struct chunk *c1;
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if (c->type != whole)
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return;
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for (i=0, c1=c->part; c1; c1=c1->next) {
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if (c1->type != extended)
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continue;
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i++;
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}
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if (i > 1) {
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sprintf(msg+strlen(msg),
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"Max one 'extended' allowed as child of 'whole'\n");
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}
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}
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/*
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* Rule#4:
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* Max seven 'part' as children of 'freebsd'
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*/
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void
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Rule_004(struct disk *d, struct chunk *c, char *msg)
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{
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int i;
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struct chunk *c1;
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if (c->type != freebsd)
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return;
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for (i=0, c1=c->part; c1; c1=c1->next) {
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if (c1->type != part)
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continue;
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i++;
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}
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if (i > 7) {
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sprintf(msg+strlen(msg),
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"Max seven 'part' allowed as child of 'freebsd'\n");
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}
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}
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void
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Check_Chunk(struct disk *d, struct chunk *c, char *msg)
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{
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Rule_000(d,c,msg);
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Rule_001(d,c,msg);
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Rule_002(d,c,msg);
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Rule_003(d,c,msg);
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Rule_004(d,c,msg);
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if (c->part)
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Check_Chunk(d,c->part,msg);
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if (c->next)
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Check_Chunk(d,c->next,msg);
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return;
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}
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char *
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CheckRules(struct disk *d)
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{
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char msg[BUFSIZ];
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*msg = '\0';
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Check_Chunk(d,d->chunks,msg);
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if (*msg)
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return strdup(msg);
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return 0;
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}
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