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freebsd-nq/lib/libdisk/write_disk.c
Jordan K. Hubbard 96e426f43d + add u_long sector_size to struct disk (documented in libdisk.3) 
+ make Open_Disk sense the sector size by trying 512, 1024 and 2048
  in this order. This makes the kernel note that
  dscheck(cd1): bio_bcount 512 is not on a sector boundary (ssize 2048)
  dscheck(cd1): bio_bcount 1024 is not on a sector boundary (ssize 2048)
  if 2048 is the sector size. If this worries anyone: the message is from
  /usr/src/sys/kern/subr_diskslice.c and shutups are to be placed there.
+ Have read_block and write_block use an additional parameter, the
  sector size.
+ replace all barfout calls with return NULL, 0, __LINE__, etc.
  Note that this does NOT emit diagnostics. More often than not,
  you don't want library functions to scribble on stderr -- it may
  not even be available. The right thing is to propagate the error
  condition to upper management. The app should take care of errors.
+ use d1->sector_size instead of 512 in various places. I've left many
  places untouched, especially those writing MBRs. I simply added
  another arg hardcoded as 512. This is because I would not know what
  I'm doing... I felt this approach would be reasonably backward
  compatible and not introduce any new bugs in critical software.
  Famous last words. Messing with MBRs might soon put me in the same
  screwup meister category as, uh, never mind.  :-)
+ bump the max no of disks from 20 to 32 (due to PR 24503).

PR:		8434 / 8436 / 24503
Submitted by:	Jens Schweikhardt <schweikh@schweikhardt.net>
2001-05-13 20:08:54 +00:00

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9.3 KiB
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/*
* ----------------------------------------------------------------------------
* "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
* ----------------------------------------------------------------------------
*
* $FreeBSD$
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/diskslice.h>
#include <paths.h>
#include "libdisk.h"
#define DOSPTYP_EXTENDED 5
#define BBSIZE 8192
#define SBSIZE 8192
#define DEF_RPM 3600
#define DEF_INTERLEAVE 1
#ifdef PC98
#define WHERE(offset,disk) (offset)
#else
#define WHERE(offset,disk) (disk->flags & DISK_ON_TRACK ? offset + 63 : offset)
#endif
/* XXX: A lot of hardcoded 512s probably should be foo->sector_size;
I'm not sure which, so I leave it like it worked before. --schweikh */
int
Write_FreeBSD(int fd, struct disk *new, struct disk *old, struct chunk *c1)
{
struct disklabel *dl;
struct chunk *c2;
int i,j;
void *p;
u_char buf[BBSIZE];
#ifdef __alpha__
u_long *lp, sum;
#endif
for(i = 0; i < BBSIZE/512; i++) {
p = read_block(fd, WHERE(i + c1->offset, new), 512);
memcpy(buf + 512 * i, p, 512);
free(p);
}
#if defined(__i386__)
if(new->boot1)
memcpy(buf, new->boot1, 512);
if(new->boot2)
memcpy(buf + 512, new->boot2, BBSIZE-512);
#elif defined(__alpha__)
if(new->boot1)
memcpy(buf + 512, new->boot1, BBSIZE-512);
#endif
dl = (struct disklabel *)(buf + 512 * LABELSECTOR + LABELOFFSET);
memset(dl, 0, sizeof *dl);
for(c2 = c1->part; c2; c2 = c2->next) {
if (c2->type == unused) continue;
if (!strcmp(c2->name, "X")) continue;
#ifdef __alpha__
j = c2->name[strlen(c2->name) - 1] - 'a';
#else
j = c2->name[strlen(new->name) + 2] - 'a';
#endif
if (j < 0 || j >= MAXPARTITIONS || j == RAW_PART) {
#ifdef DEBUG
warn("weird partition letter %c", c2->name[strlen(new->name) + 2]);
#endif
continue;
}
dl->d_partitions[j].p_size = c2->size;
dl->d_partitions[j].p_offset = c2->offset;
dl->d_partitions[j].p_fstype = c2->subtype;
}
dl->d_bbsize = BBSIZE;
/*
* Add in defaults for superblock size, interleave, and rpms
*/
dl->d_sbsize = SBSIZE;
dl->d_interleave = DEF_INTERLEAVE;
dl->d_rpm = DEF_RPM;
strcpy(dl->d_typename, c1->name);
dl->d_secsize = 512;
dl->d_secperunit = new->chunks->size;
dl->d_ncylinders = new->bios_cyl;
dl->d_ntracks = new->bios_hd;
dl->d_nsectors = new->bios_sect;
dl->d_secpercyl = dl->d_ntracks * dl->d_nsectors;
dl->d_npartitions = MAXPARTITIONS;
dl->d_type = new->name[0] == 's' || new->name[0] == 'd' ||
new->name[0] == 'o' ? DTYPE_SCSI : DTYPE_ESDI;
dl->d_partitions[RAW_PART].p_size = c1->size;
dl->d_partitions[RAW_PART].p_offset = c1->offset;
#ifdef PC98
dl->d_rpm = 3600;
dl->d_interleave = 1;
#endif
#ifndef PC98
if(new->flags & DISK_ON_TRACK)
for(i=0;i<MAXPARTITIONS;i++)
if (dl->d_partitions[i].p_size)
dl->d_partitions[i].p_offset += 63;
#endif
dl->d_magic = DISKMAGIC;
dl->d_magic2 = DISKMAGIC;
dl->d_checksum = dkcksum(dl);
#ifdef __alpha__
/*
* Tell SRM where the bootstrap is.
*/
lp = (u_long *)buf;
lp[60] = 15;
lp[61] = 1;
lp[62] = 0;
/*
* Generate the bootblock checksum for the SRM console.
*/
for (lp = (u_long *)buf, i = 0, sum = 0; i < 63; i++)
sum += lp[i];
lp[63] = sum;
#endif /*__alpha__*/
for(i=0;i<BBSIZE/512;i++) {
write_block(fd,WHERE(i + c1->offset, new), buf + 512 * i, 512);
}
return 0;
}
int
Write_Extended(int fd, struct disk *new, struct disk *old, struct chunk *c1)
{
return 0;
}
#if defined(__i386__) && !defined(PC98)
static void
Write_Int32(u_int32_t *p, u_int32_t v)
{
u_int8_t *bp = (u_int8_t *)p;
bp[0] = (v >> 0) & 0xff;
bp[1] = (v >> 8) & 0xff;
bp[2] = (v >> 16) & 0xff;
bp[3] = (v >> 24) & 0xff;
}
#endif
#if defined(__i386__) && !defined(PC98)
/*
* Special install-time configuration for the i386 boot0 boot manager.
*/
static void
Cfg_Boot_Mgr(u_char *mbr, int edd)
{
if (mbr[0x1b0] == 0x66 && mbr[0x1b1] == 0xbb) {
if (edd)
mbr[0x1bb] |= 0x80; /* Packet mode on */
else
mbr[0x1bb] &= 0x7f; /* Packet mode off */
}
}
#endif
int
Write_Disk(struct disk *d1)
{
int fd,i;
#ifdef __i386__
int j;
#endif
struct disk *old = 0;
struct chunk *c1;
int ret = 0;
char device[64];
u_char *mbr;
struct dos_partition *dp,work[NDOSPART];
#ifdef PC98
int s[7];
int PC98_EntireDisk = 0;
#else
int s[4];
#ifdef __i386__
int need_edd = 0; /* Need EDD (packet interface) */
#endif
#endif
int one = 1;
int zero = 0;
strcpy(device,_PATH_DEV);
strcat(device,d1->name);
#ifdef PC98
/* XXX - for entire FreeBSD(98) */
for (c1 = d1->chunks->part; c1; c1 = c1->next) {
if ((c1->type == freebsd) || (c1->offset == 0))
device[9] = 0;
}
#endif
fd = open(device,O_RDWR);
if (fd < 0) {
#ifdef DEBUG
warn("open(%s) failed", device);
#endif
return 1;
}
ioctl(fd, DIOCWLABEL, &one);
memset(s,0,sizeof s);
#ifdef PC98
mbr = read_block(fd, WHERE(1, d1), d1->sector_size);
#else
mbr = read_block(fd, WHERE(0, d1), d1->sector_size);
#endif
dp = (struct dos_partition*)(mbr + DOSPARTOFF);
memcpy(work, dp, sizeof work);
dp = work;
free(mbr);
for (c1 = d1->chunks->part; c1; c1 = c1->next) {
if (c1->type == unused) continue;
if (!strcmp(c1->name, "X")) continue;
#ifdef __i386__
j = c1->name[4] - '1';
j = c1->name[strlen(d1->name) + 1] - '1';
#ifdef PC98
if (j < 0 || j > 7)
#else
if (j < 0 || j > 3)
#endif
continue;
s[j]++;
#endif
#ifndef PC98
if (c1->type == extended)
ret += Write_Extended(fd, d1, old, c1);
#endif
if (c1->type == freebsd)
ret += Write_FreeBSD(fd, d1, old, c1);
#ifdef __i386__
#ifndef PC98
Write_Int32(&dp[j].dp_start, c1->offset);
Write_Int32(&dp[j].dp_size, c1->size);
#endif
i = c1->offset;
#ifdef PC98
dp[j].dp_ssect = dp[j].dp_ipl_sct = i % d1->bios_sect;
i -= dp[j].dp_ssect;
i /= d1->bios_sect;
dp[j].dp_shd = dp[j].dp_ipl_head = i % d1->bios_hd;
i -= dp[j].dp_shd;
i /= d1->bios_hd;
dp[j].dp_scyl = dp[j].dp_ipl_cyl = i;
#else
if (i >= 1024*d1->bios_sect*d1->bios_hd) {
dp[j].dp_ssect = 0xff;
dp[j].dp_shd = 0xff;
dp[j].dp_scyl = 0xff;
need_edd++;
} else {
dp[j].dp_ssect = i % d1->bios_sect;
i -= dp[j].dp_ssect++;
i /= d1->bios_sect;
dp[j].dp_shd = i % d1->bios_hd;
i -= dp[j].dp_shd;
i /= d1->bios_hd;
dp[j].dp_scyl = i;
i -= dp[j].dp_scyl;
dp[j].dp_ssect |= i >> 2;
}
#endif /* PC98 */
#ifdef DEBUG
printf("S:%lu = (%x/%x/%x)",
c1->offset, dp[j].dp_scyl, dp[j].dp_shd, dp[j].dp_ssect);
#endif
i = c1->end;
#ifdef PC98
#if 1
dp[j].dp_esect = dp[j].dp_ehd = 0;
dp[j].dp_ecyl = i / (d1->bios_sect * d1->bios_hd);
#else
dp[j].dp_esect = i % d1->bios_sect;
i -= dp[j].dp_esect;
i /= d1->bios_sect;
dp[j].dp_ehd = i % d1->bios_hd;
i -= dp[j].dp_ehd;
i /= d1->bios_hd;
dp[j].dp_ecyl = i;
#endif
#else
dp[j].dp_esect = i % d1->bios_sect;
i -= dp[j].dp_esect++;
i /= d1->bios_sect;
dp[j].dp_ehd = i % d1->bios_hd;
i -= dp[j].dp_ehd;
i /= d1->bios_hd;
if (i>1023) i = 1023;
dp[j].dp_ecyl = i;
i -= dp[j].dp_ecyl;
dp[j].dp_esect |= i >> 2;
#endif
#ifdef DEBUG
printf(" E:%lu = (%x/%x/%x)\n",
c1->end, dp[j].dp_ecyl, dp[j].dp_ehd, dp[j].dp_esect);
#endif
#ifdef PC98
dp[j].dp_mid = c1->subtype & 0xff;
dp[j].dp_sid = c1->subtype >> 8;
if (c1->flags & CHUNK_ACTIVE)
dp[j].dp_mid |= 0x80;
strncpy(dp[j].dp_name, c1->sname, 16);
#else
dp[j].dp_typ = c1->subtype;
if (c1->flags & CHUNK_ACTIVE)
dp[j].dp_flag = 0x80;
else
dp[j].dp_flag = 0;
#endif
#endif
}
#ifdef __i386__
j = 0;
for(i = 0; i < NDOSPART; i++) {
if (!s[i])
memset(dp + i, 0, sizeof *dp);
#ifndef PC98
if (dp[i].dp_flag)
j++;
#endif
}
#ifndef PC98
if (!j)
for(i = 0; i < NDOSPART; i++)
if (dp[i].dp_typ == 0xa5)
dp[i].dp_flag = 0x80;
#endif
#ifdef PC98
if (d1->bootipl)
write_block(fd, WHERE(0, d1), d1->bootipl, d1->sector_size);
mbr = read_block(fd, WHERE(1, d1), d1->sector_size);
memcpy(mbr + DOSPARTOFF, dp, sizeof *dp * NDOSPART);
/* XXX - for entire FreeBSD(98) */
for (c1 = d1->chunks->part; c1; c1 = c1->next)
if (((c1->type == freebsd) || (c1->type == fat))
&& (c1->offset == 0))
PC98_EntireDisk = 1;
if (PC98_EntireDisk == 0)
write_block(fd, WHERE(1, d1), mbr, d1->sector_size);
if (d1->bootmenu)
for (i = 0; i * d1->sector_size < d1->bootmenu_size; i++)
write_block(fd, WHERE(2 + i, d1), &d1->bootmenu[i * d1->sector_size], d1->sector_size);
#else
mbr = read_block(fd, WHERE(0, d1), d1->sector_size);
if (d1->bootmgr) {
memcpy(mbr, d1->bootmgr, DOSPARTOFF);
Cfg_Boot_Mgr(mbr, need_edd);
}
memcpy(mbr + DOSPARTOFF, dp, sizeof *dp * NDOSPART);
mbr[512-2] = 0x55;
mbr[512-1] = 0xaa;
write_block(fd, WHERE(0, d1), mbr, d1->sector_size);
if (d1->bootmgr && d1->bootmgr_size > d1->sector_size)
for(i = 1; i * d1->sector_size <= d1->bootmgr_size; i++)
write_block(fd, WHERE(i, d1), &d1->bootmgr[i * d1->sector_size], d1->sector_size);
#endif
#endif
i = 1;
i = ioctl(fd, DIOCSYNCSLICEINFO, &i);
#ifdef DEBUG
if (i != 0)
warn("ioctl(DIOCSYNCSLICEINFO)");
#endif
ioctl(fd, DIOCWLABEL, &zero);
close(fd);
return 0;
}
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