freebsd-dev/release/libdisk/rules.c
1995-06-11 19:33:05 +00:00

317 lines
6.8 KiB
C

/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: rules.c,v 1.10.2.1 1995/06/03 08:40:33 jkh Exp $
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/diskslice.h>
#include <sys/disklabel.h>
#include <err.h>
#include "libdisk.h"
int
Track_Aligned(struct disk *d, u_long offset)
{
if (!d->bios_sect)
return 1;
if (offset % d->bios_sect)
return 0;
return 1;
}
u_long
Prev_Track_Aligned(struct disk *d, u_long offset)
{
if (!d->bios_sect)
return offset;
return (offset / d->bios_sect) * d->bios_sect;
}
u_long
Next_Track_Aligned(struct disk *d, u_long offset)
{
if (!d->bios_sect)
return offset;
return Prev_Track_Aligned(d,offset + d->bios_sect-1);
}
int
Cyl_Aligned(struct disk *d, u_long offset)
{
if (!d->bios_sect || !d->bios_hd)
return 1;
if (offset % (d->bios_sect * d->bios_hd))
return 0;
return 1;
}
u_long
Prev_Cyl_Aligned(struct disk *d, u_long offset)
{
if (!d->bios_sect || !d->bios_hd)
return offset;
return (offset / (d->bios_sect*d->bios_hd)) * d->bios_sect * d->bios_hd;
}
u_long
Next_Cyl_Aligned(struct disk *d, u_long offset)
{
if (!d->bios_sect || !d->bios_hd)
return offset;
return Prev_Cyl_Aligned(d,offset + (d->bios_sect * d->bios_hd)-1);
}
/*
* Rule#0:
* Chunks of type 'whole' can have max NDOSPART children.
* Only one of them can have the "active" flag
*/
void
Rule_000(struct disk *d, struct chunk *c, char *msg)
{
int i=0,j=0;
struct chunk *c1;
if (c->type != whole)
return;
for (c1=c->part; c1; c1=c1->next) {
if (c1->type != unused) continue;
if (c1->flags & CHUNK_ACTIVE)
j++;
i++;
}
if (i > NDOSPART)
sprintf(msg+strlen(msg),
"%d is too many children of the 'whole' chunk. Max is %d\n",
i, NDOSPART);
if (j > 1)
sprintf(msg+strlen(msg),
"Too many active children of 'whole'");
}
/*
* Rule#1:
* All children of 'whole' and 'extended' must be track-aligned.
* Exception: the end can be unaligned if it matches the end of 'whole'
*/
void
Rule_001(struct disk *d, struct chunk *c, char *msg)
{
int i;
struct chunk *c1;
if (c->type != whole && c->type != extended)
return;
for (i=0, c1=c->part; c1; c1=c1->next) {
if (c1->type == unused) continue;
c1->flags |= CHUNK_ALIGN;
if (!Track_Aligned(d,c1->offset))
sprintf(msg+strlen(msg),
"chunk '%s' [%ld..%ld] does not start on a track boundary\n",
c1->name,c1->offset,c1->end);
if ((c->type == whole || c->end == c1->end)
|| Cyl_Aligned(d,c1->end+1))
;
else
sprintf(msg+strlen(msg),
"chunk '%s' [%ld..%ld] does not end on a cylinder boundary\n",
c1->name,c1->offset,c1->end);
}
}
/*
* Rule#2:
* Max one 'fat' as child of 'whole'
*/
void
Rule_002(struct disk *d, struct chunk *c, char *msg)
{
int i;
struct chunk *c1;
if (c->type != whole)
return;
for (i=0, c1=c->part; c1; c1=c1->next) {
if (c1->type != fat)
continue;
i++;
}
if (i > 1) {
sprintf(msg+strlen(msg),
"Max one 'fat' allowed as child of 'whole'\n");
}
}
/*
* Rule#3:
* Max one extended as child of 'whole'
*/
void
Rule_003(struct disk *d, struct chunk *c, char *msg)
{
int i;
struct chunk *c1;
if (c->type != whole)
return;
for (i=0, c1=c->part; c1; c1=c1->next) {
if (c1->type != extended)
continue;
i++;
}
if (i > 1) {
sprintf(msg+strlen(msg),
"Max one 'extended' allowed as child of 'whole'\n");
}
}
/*
* Rule#4:
* Max seven 'part' as children of 'freebsd'
* Max one CHUNK_IS_ROOT child per 'freebsd'
* If Bad144, space for table must exist.
* If Bad144 & root, bad144 table must be inside 1024
*/
void
Rule_004(struct disk *d, struct chunk *c, char *msg)
{
int i=0,k=0;
struct chunk *c1;
u_long l;
if (c->type != freebsd)
return;
if (c->flags & CHUNK_BAD144) {
l = c->end - 127 - d->bios_sect + 1;
for (c1=c->part; c1; c1=c1->next) {
if (c1->end < l || c1->type == unused)
continue;
sprintf(msg+strlen(msg),
"Blocks %lu to %lu are needed for bad144 information, but isn't unused.\n",
l, c->end);
break;
}
if (c->flags & CHUNK_PAST_1024) {
for (c1=c->part; c1; c1=c1->next) {
if (c1->flags & CHUNK_IS_ROOT) {
sprintf(msg+strlen(msg),
"You have assigned root to a slice which uses bad144, and\n extends past the first 1023 cylinders, and thus cannot be booted from.\n");
break;
}
}
}
}
for (c1=c->part; c1; c1=c1->next) {
if (c1->type != part)
continue;
if (c1->flags & CHUNK_IS_ROOT) {
k++;
if (c1->flags & CHUNK_PAST_1024)
sprintf(msg+strlen(msg),
"Root filesystem extends past cylinder 1024, and cannot be booted from\n");
}
i++;
}
if (i > 7) {
sprintf(msg+strlen(msg),
"Max seven partitions per freebsd slice\n");
}
if (k > 1) {
sprintf(msg+strlen(msg),
"Max one root partition child per freebsd slice\n");
}
}
void
Check_Chunk(struct disk *d, struct chunk *c, char *msg)
{
Rule_000(d,c,msg);
Rule_001(d,c,msg);
Rule_002(d,c,msg);
Rule_003(d,c,msg);
Rule_004(d,c,msg);
if (c->part)
Check_Chunk(d,c->part,msg);
if (c->next)
Check_Chunk(d,c->next,msg);
if (c->end >= 1024*d->bios_hd*d->bios_sect)
c->flags |= CHUNK_PAST_1024;
else
c->flags &= ~CHUNK_PAST_1024;
}
char *
CheckRules(struct disk *d)
{
char msg[BUFSIZ];
*msg = '\0';
Check_Chunk(d,d->chunks,msg);
if (*msg)
return strdup(msg);
return 0;
}
char *
ChunkCanBeRoot(struct chunk *c)
{
struct chunk *c1;
struct disk *d = c->disk;
char msg[BUFSIZ];
*msg = '\0';
if (c->flags & CHUNK_PAST_1024) {
strcat(msg,
"The root partition must end before cylinder 1024 seen from\n");
strcat(msg,
"the BIOS' point of view, or it cannot be booted from.\n");
return strdup(msg);
}
for (c1=d->chunks->part;;) {
for (; c1; c1=c1->next)
if (c1->offset <= c->offset && c1->end >= c->end)
break;
if (!c1) {
strcat(msg,
"Internal trouble, cannot find this chunk in the chunk-tree\n");
return strdup(msg);
}
if (c1->type == freebsd)
break;
c1 = c1->part;
}
if (c1->type != freebsd) {
strcat(msg,
"The root partition must be in a FreeBSD slice, otherwise\n");
strcat(msg,
"the kernel cannot be booted from it\n");
return strdup(msg);
}
if ((c1->flags & CHUNK_BAD144) && (c1->flags & CHUNK_PAST_1024)) {
strcat(msg,
"This partition is unsuitable for root, because the FreeBSD slice\n");
strcat(msg,
"it is inside has bad144 enabled, but the badblock data lives past\n");
strcat(msg,
"the 1024th cylinder, and the bootblocks cannot get to it there.\n");
return strdup(msg);
}
return NULL;
}