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freebsd/lib/libdisk/rules.c

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/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> 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
* ----------------------------------------------------------------------------
*/
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/disklabel.h>
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#ifdef PC98
#include <sys/diskpc98.h>
#else
#include <sys/diskmbr.h>
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#endif
#include "libdisk.h"
int
Track_Aligned(const struct disk *d, u_long offset)
{
#ifndef __ia64__
if (!d->bios_sect)
return 1;
if (offset % d->bios_sect)
return 0;
#endif /* __ia64__ */
return 1;
}
u_long
Prev_Track_Aligned(const struct disk *d, u_long offset)
{
#ifndef __ia64__
if (!d->bios_sect)
return offset;
return (offset / d->bios_sect) * d->bios_sect;
#else
return 1;
#endif
}
u_long
Next_Track_Aligned(const struct disk *d, u_long offset)
{
#ifndef __ia64__
if (!d->bios_sect)
return offset;
return Prev_Track_Aligned(d, offset + d->bios_sect-1);
#else
return 1;
#endif
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}
static int
Cyl_Aligned(const struct disk *d, u_long offset)
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{
#ifndef __ia64__
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if (!d->bios_sect || !d->bios_hd)
return 1;
if (offset % (d->bios_sect * d->bios_hd))
return 0;
#endif
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return 1;
}
u_long
Prev_Cyl_Aligned(const struct disk *d, u_long offset)
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{
#ifndef __ia64__
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if (!d->bios_sect || !d->bios_hd)
return offset;
return (offset / (d->bios_sect * d->bios_hd)) * d->bios_sect *
d->bios_hd;
#else
return 1;
#endif
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}
u_long
Next_Cyl_Aligned(const struct disk *d, u_long offset)
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{
#ifndef __ia64__
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if (!d->bios_sect || !d->bios_hd)
return offset;
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return Prev_Cyl_Aligned(d,offset + (d->bios_sect * d->bios_hd) - 1);
#else
return 1;
#endif
}
/*
* Rule#0:
* Chunks of type 'whole' can have max NDOSPART children.
* Only one of them can have the "active" flag
*/
static void
Rule_000(const struct disk *d, const struct chunk *c, char *msg)
{
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#ifdef PC98
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int i = 0;
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#else
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int i = 0, j = 0;
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#endif
struct chunk *c1;
if (c->type != whole)
return;
for (c1 = c->part; c1; c1 = c1->next) {
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if (c1->type != unused)
continue;
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#ifndef PC98
if (c1->flags & CHUNK_ACTIVE)
j++;
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#endif
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i++;
}
if (i > NDOSPART)
sprintf(msg + strlen(msg),
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"%d is too many children of the 'whole' chunk."
" Max is %d\n", i, NDOSPART);
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#ifndef PC98
if (j > 1)
sprintf(msg + strlen(msg),
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"Too many active children of 'whole'");
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#endif
}
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/*
* 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'
*/
static void
Rule_001(const struct disk *d, const struct chunk *c, char *msg)
{
struct chunk *c1;
if (c->type != whole && c->type != extended)
return;
for (c1 = c->part; c1; c1 = c1->next) {
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if (c1->type == unused)
continue;
c1->flags |= CHUNK_ALIGN;
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#ifdef PC98
if (!Cyl_Aligned(d, c1->offset))
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#else
if (!Track_Aligned(d, c1->offset))
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#endif
sprintf(msg + strlen(msg),
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#ifdef PC98
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"chunk '%s' [%ld..%ld] does not start"
" on a cylinder boundary\n",
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#else
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"chunk '%s' [%ld..%ld] does not start"
" on a track boundary\n",
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#endif
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),
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"chunk '%s' [%ld..%ld] does not end"
" on a cylinder boundary\n",
c1->name, c1->offset, c1->end);
}
}
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/*
* Rule#2:
* Max one 'fat' as child of 'whole'
*/
static void
Rule_002(const struct disk *d, const 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),
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"Max one 'fat' allowed as child of 'whole'\n");
}
}
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/*
* Rule#3:
* Max one extended as child of 'whole'
*/
static void
Rule_003(const struct disk *d, const 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),
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"Max one 'extended' allowed as child of 'whole'\n");
}
}
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/*
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* Rule#4:
* Max seven 'part' as children of 'freebsd'
* Max one CHUNK_IS_ROOT child per 'freebsd'
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*/
static void
Rule_004(const struct disk *d, const struct chunk *c, char *msg)
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{
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int i = 0, k = 0;
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struct chunk *c1;
if (c->type != freebsd)
return;
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for (c1 = c->part; c1; c1 = c1->next) {
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if (c1->type != part)
continue;
if (c1->flags & CHUNK_IS_ROOT)
k++;
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i++;
}
if (i > 7) {
sprintf(msg + strlen(msg),
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"Max seven partitions per freebsd slice\n");
}
if (k > 1) {
sprintf(msg + strlen(msg),
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"Max one root partition child per freebsd slice\n");
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}
}
static void
Check_Chunk(const struct disk *d, const struct chunk *c, char *msg)
{
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switch (platform) {
case p_i386:
case p_amd64:
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);
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break;
case p_pc98:
Rule_000(d, c, msg);
Rule_001(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);
break;
default:
break;
}
}
char *
CheckRules(const struct disk *d)
{
char msg[BUFSIZ];
*msg = '\0';
Check_Chunk(d, d->chunks, msg);
if (*msg)
return strdup(msg);
return 0;
}