/
geometry.c
596 lines (536 loc) · 17 KB
/
geometry.c
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/* geometry.c - Device and file geometry computation */
/* Copyright 1992-1998 Werner Almesberger. See file COPYING for details. */
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/fs.h>
#include <linux/fd.h>
#include <linux/hdreg.h>
#include "config.h"
#include "lilo.h"
#include "common.h"
#include "device.h"
#include "geometry.h"
#include "cfg.h"
#ifndef HDIO_GETGEO
#define HDIO_GETGEO HDIO_REQ
#endif
typedef struct _st_buf {
struct _st_buf *next;
struct stat st;
} ST_BUF;
DT_ENTRY *disktab = NULL;
int old_disktab = 0;
void geo_init(char *name)
{
FILE *file;
char line[MAX_LINE+1];
char *here;
DT_ENTRY *entry;
int disk_section,items;
if (name) {
if ((file = fopen(name,"r")) == NULL)
die("open %s: %s",name,strerror(errno));
}
else if ((file = fopen(DFL_DISKTAB,"r")) == NULL) return;
disk_section = !!disktab;
while (fgets(line,MAX_LINE,file)) {
here = strchr(line,'\n');
if (here) *here = 0;
here = strchr(line,'#');
if (here) *here = 0;
if (strspn(line," \t") != strlen(line)) {
entry = alloc_t(DT_ENTRY);
items = sscanf(line,"0x%x 0x%x %d %d %d %d",&entry->device,
&entry->bios,&entry->sectors,&entry->heads,&entry->cylinders,
&entry->start);
if (items == 5) entry->start = -1;
if (items < 5)
die("Invalid line in %s:\n\"%s\"",name ? name : DFL_DISKTAB,
line);
entry->next = disktab;
disktab = entry;
if (disk_section) die("DISKTAB and DISK are mutually exclusive");
old_disktab = 1;
}
}
(void) fclose(file);
}
void do_partition(void)
{
DT_ENTRY *entry,*walk;
struct stat st;
char *partition,*start;
entry = alloc_t(DT_ENTRY);
*entry = *disktab;
entry->start = -1;
partition = cfg_get_strg(cf_partitions,"partition");
if (stat(partition,&st) < 0) die("stat %s: %s",partition,strerror(errno));
if (!S_ISBLK(st.st_mode) || ((st.st_rdev ^ disktab->device) & ~PART_MASK))
die("%s is not a valid partition device",partition);
entry->device = st.st_rdev;
cfg_init(cf_partition);
(void) cfg_parse(cf_partition);
start = cfg_get_strg(cf_partition,"start");
entry->start = start ? to_number(start) : -1;
for (walk = disktab; walk; walk = walk->next)
if (entry->device == walk->device)
die("Duplicate geometry definition for %s",partition);
entry->next = disktab;
disktab = entry;
cfg_init(cf_partitions);
}
static int has_partitions(dev_t dev)
{
return MAJOR(dev) == MAJOR_HD || MAJOR(dev) == MAJOR_IDE2 ||
MAJOR(dev) == MAJOR_IDE3 || MAJOR(dev) == MAJOR_IDE4 ||
MAJOR(dev) == MAJOR_IDE5 || MAJOR(dev) == MAJOR_IDE6 ||
MAJOR(dev) == MAJOR_XT || MAJOR(dev) == MAJOR_SD ||
MAJOR(dev) == MAJOR_ESDI || MAJOR(dev) == MAJOR_DAC960;
}
void do_disk(void)
{
DT_ENTRY *entry,*walk;
struct stat st;
char *disk,*bios,*sectors,*heads,*cylinders;
entry = alloc_t(DT_ENTRY);
disk = cfg_get_strg(cf_options,"disk");
if (stat(disk,&st) < 0) die("stat %s: %s",disk,strerror(errno));
if (!S_ISBLK(st.st_mode) || ((MINOR(st.st_rdev) & PART_MASK) &&
has_partitions(st.st_rdev)))
die("RSN: %s is not a whole disk device",disk);
entry->device = st.st_rdev;
cfg_init(cf_disk);
(void) cfg_parse(cf_disk);
bios = cfg_get_strg(cf_disk,"bios");
sectors = cfg_get_strg(cf_disk,"sectors");
heads = cfg_get_strg(cf_disk,"heads");
cylinders = cfg_get_strg(cf_disk,"cylinders");
entry->bios = bios ? to_number(bios) : -1;
if (!sectors && !heads) entry->sectors = entry->heads = -1;
else if (!(sectors && heads))
die("Must specify SECTORS and HEADS together");
else {
entry->sectors = to_number(sectors);
entry->heads = to_number(heads);
}
if (cfg_get_flag(cf_disk,"inaccessible")) {
entry->heads = 0;
if (cfg_get_strg(cf_disk,"bios") || cfg_get_strg(cf_disk,"sectors") ||
cfg_get_strg(cf_disk,"heads") || cfg_get_strg(cf_disk,"cylinders"))
die("No geometry variables allowed if INACCESSIBLE");
}
entry->cylinders = cylinders ? to_number(cylinders) : -1;
entry->start = 0;
for (walk = disktab; walk; walk = walk->next)
if (entry->device == walk->device)
die("Duplicate geometry definition for %s",disk);
entry->next = disktab;
disktab = entry;
cfg_init(cf_partitions);
(void) cfg_parse(cf_partitions);
cfg_unset(cf_options,"disk");
}
static int exists(const char *name)
{
struct hd_geometry dummy;
int fd,yes;
char buff;
if ((fd = open(name,O_RDWR)) < 0) return 0; /* was O_RDONLY */
yes = read(fd,&buff,1) == 1 && ioctl(fd,HDIO_GETGEO,&dummy) >= 0;
(void) close(fd);
return yes;
}
#if 0
static int scan_last_dev(ST_BUF *next,char *parent,int major,int increment)
{
DIR *dp;
struct dirent *dir;
char name[PATH_MAX+1];
ST_BUF st,*walk;
int max,this;
st.next = next;
max = 0;
if ((dp = opendir(parent)) == NULL)
die("opendir %s: %s",parent,strerror(errno));
while ((dir = readdir(dp))) {
sprintf(name,"%s/%s",parent,dir->d_name);
if (stat(name,&st.st) >= 0) {
if (S_ISBLK(st.st.st_mode) && MAJOR(st.st.st_rdev) == major &&
(MINOR(st.st.st_rdev) & (increment-1)) == 0) {
this = MINOR(st.st.st_rdev)/increment+1;
if (this > max && exists(name)) max = this;
}
if (S_ISDIR(st.st.st_mode) && strcmp(dir->d_name,".") &&
strcmp(dir->d_name,"..")) {
for (walk = next; walk; walk = walk->next)
if (stat_equal(&walk->st,&st.st)) break;
if (!walk) {
this = scan_last_dev(&st,name,major,increment);
if (this > max) max = this;
}
}
}
}
(void) closedir(dp);
return max;
}
#endif
static int last_dev(int major,int increment)
{
/*
* In version 12 to 18, LILO only relied on scan_last_dev (or last_dev). This
* obviously didn't work if entries in /dev were missing. Versions 18 and 19
* added the probe loop, which seems to be okay, but which may probe for
* invalid minor numbers. The IDE driver objects to that. Since last_dev is
* only used to count IDE drives anyway, we try now only the first two devices
* and forget about scan_last_dev.
*/
#if 0
DEVICE dev;
int minor;
for (minor = 0; dev_open(&dev,(major << 8) | minor,-1); minor += increment)
if (exists(dev.name)) dev_close(&dev);
else {
dev_close(&dev);
return minor/increment;
}
return scan_last_dev(NULL,DEV_DIR,major,increment);
#else
DEVICE dev;
int devs;
for (devs = 0; devs < 2 && dev_open(&dev,(major << 8) | (increment*devs),
-1); devs++)
if (exists(dev.name)) dev_close(&dev);
else {
dev_close(&dev);
break;
}
return devs;
#endif
}
void geo_query_dev(GEOMETRY *geo,int device,int all)
{
DEVICE dev;
int fd,get_all;
struct floppy_struct fdprm;
struct hd_geometry hdprm;
get_all = all || MAJOR(device) != MAJOR_FD;
if (!MAJOR(device))
die("Trying to map files from unnamed device 0x%04x (NFS ?)",device);
if (device == MAJMIN_RAM)
die("Trying to map files from your RAM disk. "
"Please check -r option or ROOT environment variable.");
if (get_all) fd = dev_open(&dev,device,O_NOACCESS);
else fd = -1; /* pacify GCC */
switch (MAJOR(device)) {
case MAJOR_FD:
geo->device = device & 3;
if (!get_all) {
geo->heads = geo->cylinders = geo->sectors = 1;
geo->start = 0;
break;
}
if (ioctl(fd,FDGETPRM,&fdprm) < 0)
die("geo_query_dev FDGETPRM (dev 0x%04x): %s",device,
strerror(errno));
geo->heads = fdprm.head;
geo->cylinders = fdprm.track;
geo->sectors = fdprm.sect;
geo->start = 0;
break;
case MAJOR_HD:
/* fall through */
case MAJOR_IDE2:
/* fall through */
case MAJOR_IDE3:
/* fall through */
case MAJOR_IDE4:
/* fall through */
case MAJOR_IDE5:
/* fall through */
case MAJOR_IDE6:
/* fall through */
case MAJOR_ESDI:
/* fall through */
case MAJOR_XT:
geo->device = 0x80+(MINOR(device) >> 6)+(MAJOR(device) == MAJOR_HD ?
0 : last_dev(MAJOR_HD,64));
if (ioctl(fd,HDIO_GETGEO,&hdprm) < 0)
die("geo_query_dev HDIO_GETGEO (dev 0x%04x): %s",device,
strerror(errno));
geo->heads = hdprm.heads;
geo->cylinders = hdprm.cylinders;
geo->sectors = hdprm.sectors;
geo->start = hdprm.start;
break;
case MAJOR_SD:
geo->device = 0x80+last_dev(MAJOR_HD,64)+(MINOR(device) >> 4);
if (ioctl(fd,HDIO_GETGEO,&hdprm) < 0)
die("geo_query_dev HDIO_GETGEO (dev 0x%04x): %s",device,
strerror(errno));
if (all && !hdprm.sectors)
die("HDIO_REQ not supported for your SCSI controller. Please "
"use a DISK section");
geo->heads = hdprm.heads;
geo->cylinders = hdprm.cylinders;
geo->sectors = hdprm.sectors;
geo->start = hdprm.start;
break;
case MAJOR_DAC960:
geo->device = 0x80+last_dev(MAJOR_HD,64)+(MINOR(device) >> 3);
if (ioctl(fd,HDIO_GETGEO,&hdprm) < 0)
die("geo_query_dev HDIO_GETGEO (dev 0x%04x): %s",device,
strerror(errno));
if (all && !hdprm.sectors)
die("HDIO_REQ not supported for your DAC960 controller. "
"Please use a DISK section");
geo->heads = hdprm.heads;
geo->cylinders = hdprm.cylinders;
geo->sectors = hdprm.sectors;
geo->start = hdprm.start;
break;
case COMPAQ_SMART2_MAJOR+0:
case COMPAQ_SMART2_MAJOR+1:
case COMPAQ_SMART2_MAJOR+2:
case COMPAQ_SMART2_MAJOR+3:
case COMPAQ_SMART2_MAJOR+4:
case COMPAQ_SMART2_MAJOR+5:
case COMPAQ_SMART2_MAJOR+6:
case COMPAQ_SMART2_MAJOR+7:
geo->device = 0x80+last_dev(MAJOR_HD,64)+(MINOR(device) >> 4);
if (ioctl(fd,HDIO_GETGEO,&hdprm) < 0)
die("geo_query_dev HDIO_GETGEO (dev 0x%04x): %s",device,
strerror(errno));
if (all && !hdprm.sectors)
die("HDIO_REQ not supported for your Array controller. Please "
"use a DISK section");
geo->heads = hdprm.heads;
geo->cylinders = hdprm.cylinders;
geo->sectors = hdprm.sectors;
geo->start = hdprm.start;
break;
default:
die("Sorry, don't know how to handle device 0x%04x",device);
}
if (get_all) dev_close(&dev);
}
int is_first(int device)
{
DT_ENTRY *walk;
for (walk = disktab; walk; walk = walk->next)
if (walk->device == device) break;
if (!walk && !old_disktab)
for (walk = disktab; walk; walk = walk->next)
if (walk->device == (device & ~PART_MASK)) break;
if (walk && !walk->heads)
die("Device 0x%04X: Configured as inaccessible.\n",device);
if (walk && walk->bios != -1) return !(walk->bios & 0x7f);
switch (MAJOR(device)) {
case MAJOR_FD:
return !(device & 3);
case MAJOR_HD:
return !(MINOR(device) >> 6);
case MAJOR_IDE2:
/* fall through */
case MAJOR_IDE3:
/* fall through */
case MAJOR_IDE4:
/* fall through */
case MAJOR_IDE5:
/* fall through */
case MAJOR_IDE6:
/* fall through */
case MAJOR_ESDI:
/* fall through */
case MAJOR_XT:
return MINOR(device) >> 6 ? 0 : !last_dev(MAJOR_HD,64);
case MAJOR_SD:
return MINOR(device) >> 4 ? 0 : !last_dev(MAJOR_HD,64);
case MAJOR_DAC960:
return MINOR(device) >> 3 ? 0 : !last_dev(MAJOR_HD,64);
default:
return 1; /* user knows what (s)he's doing ... I hope */
}
}
void geo_get(GEOMETRY *geo,int device,int user_device,int all)
{
DT_ENTRY *walk;
int inherited,keep_cyls;
for (walk = disktab; walk; walk = walk->next)
if (walk->device == device) break;
inherited = !walk && !old_disktab;
if (inherited)
for (walk = disktab; walk; walk = walk->next)
if (walk->device == (device & ~PART_MASK)) break;
if (walk && !walk->heads)
die("Device 0x%04X: Configured as inaccessible.\n",device);
keep_cyls = !walk || walk->bios == -1 || walk->heads == -1 ||
walk->sectors == -1 || inherited || walk->start == -1;
if (keep_cyls) {
geo_query_dev(geo,device,all);
if (!nowarn && (geo->device & 0x7f) >= BIOS_MAX_DEVS &&
user_device == -1 && (!walk || walk->bios == -1))
fprintf(stderr,"Warning: BIOS drive 0x%02x may not be accessible\n",
geo->device);
}
if (walk) {
if (walk->bios != -1) geo->device = walk->bios;
if (walk->heads != -1) geo->heads = walk->heads;
if (walk->cylinders != -1 || !keep_cyls)
geo->cylinders = walk->cylinders;
if (walk->sectors != -1) geo->sectors = walk->sectors;
if (walk->start != -1 && !inherited) geo->start = walk->start;
}
if (user_device != -1) geo->device = user_device;
if (!all) {
if (verbose > 2)
printf("Device 0x%04x: BIOS drive 0x%02x, no geometry.\n",device,
geo->device);
return;
}
if (!geo->heads || !geo->cylinders || !geo->sectors)
die("Device 0x%04X: Got bad geometry %d/%d/%d\n",device,
geo->sectors,geo->heads,geo->cylinders);
if (geo->heads > BIOS_MAX_HEADS)
die("Device 0x%04X: Maximum number of heads is %d, not %d\n",device,
BIOS_MAX_HEADS,geo->heads);
if (geo->sectors > BIOS_MAX_SECS)
die("Device 0x%04X: Maximum number of sectors is %d, not %d\n",
device,BIOS_MAX_SECS,geo->sectors);
if ((geo->start+geo->sectors-1)/geo->heads/geo->sectors >= BIOS_MAX_CYLS &&
!nowarn)
fprintf(stderr,"Warning: device 0x%04x exceeds %d cylinder limit\n",
device,BIOS_MAX_CYLS);
if (verbose > 2) {
printf("Device 0x%04x: BIOS drive 0x%02x, %d heads, %d cylinders,\n",
device,geo->device,geo->heads,geo->cylinders == -1 ? BIOS_MAX_CYLS :
geo->cylinders);
printf("%15s%d sectors. Partition offset: %d sectors.\n","",
geo->sectors,geo->start);
}
}
int geo_open(GEOMETRY *geo,char *name,int flags)
{
char *here;
int user_dev,block_size;
struct stat st;
if ((here = strrchr(name,':')) == NULL) user_dev = -1;
else {
fprintf(stderr,":BIOS syntax is no longer supported. Please use a "
"DISK section\n");
*here++ = 0;
user_dev = to_number(here);
}
if ((geo->fd = open(name,flags)) < 0)
die("open %s: %s",name,strerror(errno));
if (fstat(geo->fd,&st) < 0) die("fstat %s: %s",name,strerror(errno));
if (!S_ISREG(st.st_mode) && !S_ISBLK(st.st_mode))
die("%s: neither a reg. file nor a block dev.",name);
geo_get(geo,S_ISREG(st.st_mode) ? st.st_dev : st.st_rdev,user_dev,1);
geo->file = S_ISREG(st.st_mode);
geo->boot = 0;
#ifndef FIGETBSZ
geo->spb = 2;
#else
if (!geo->file) geo->spb = 2;
else {
if (ioctl(geo->fd,FIGETBSZ,&block_size) < 0) {
fprintf(stderr,"FIGETBSZ %s: %s\n",name,strerror(errno));
geo->spb = 2;
}
else {
if (!block_size || (block_size & (SECTOR_SIZE-1)))
die("Incompatible block size: %d\n",block_size);
geo->spb = block_size/SECTOR_SIZE;
}
}
#endif
return geo->fd;
}
int geo_open_boot(GEOMETRY *geo,char *name)
{
struct stat st;
dev_t dev;
if (stat(name,&st) < 0) die("stat %s: %s",name,strerror(errno));
if (!S_ISREG(st.st_mode) && !S_ISBLK(st.st_mode))
die("%s: neither a reg. file nor a block dev.",name);
dev = S_ISREG(st.st_mode) ? st.st_dev : st.st_rdev;
if (MAJOR(dev) == MAJOR_FD) geo->fd = 0;
else if ((geo->fd = open(name,O_NOACCESS)) < 0)
die("open %s: %s",name,strerror(errno));
geo_get(geo,dev,-1,0);
geo->file = S_ISREG(st.st_mode);
geo->boot = 1;
geo->spb = 1;
return geo->fd;
}
void geo_close(GEOMETRY *geo)
{
if (geo->fd) (void) close(geo->fd);
}
#ifndef FIBMAP
#define FIBMAP BMAP_IOCTL
#endif
int geo_comp_addr(GEOMETRY *geo,int offset,SECTOR_ADDR *addr)
{
int block,sector;
if (geo->boot && offset >= SECTOR_SIZE)
die("Internal error: sector > 0 after geo_open_boot");
block = offset/geo->spb/SECTOR_SIZE;
if (geo->file) {
if (ioctl(geo->fd,FIBMAP,&block) < 0) pdie("ioctl FIBMAP");
if (!block) return 0;
}
sector = block*geo->spb+((offset/SECTOR_SIZE) % geo->spb);
sector += geo->start;
if (linear) {
addr->device = geo->device | LINEAR_FLAG;
addr->sector = sector & 0xff;
addr->track = (sector >> 8) & 0xff;
addr->head = sector >> 16;
if (verbose > 4)
printf("fd %d: offset %d -> linear %d\n",geo->fd,offset,sector);
}
else {
addr->device = geo->device;
addr->sector = (sector % geo->sectors)+1;
sector /= geo->sectors;
addr->head = sector % geo->heads;
sector /= geo->heads;
if (sector >= BIOS_MAX_CYLS)
die("geo_comp_addr: Cylinder number is too big (%d > %d)",sector,
BIOS_MAX_CYLS-1);
if (sector >= geo->cylinders && geo->cylinders != -1)
die("geo_comp_addr: Cylinder %d beyond end of media (%d)",sector,
geo->cylinders);
if (verbose > 4)
printf("fd %d: offset %d -> dev %d, head %d, track %d, sector %d\n",
geo->fd,offset,addr->device,addr->head,sector,addr->sector);
addr->track = sector & 255;
addr->sector |= (sector >> 8) << 6;
}
addr->num_sect = 1;
return 1;
}
int geo_find(GEOMETRY *geo,SECTOR_ADDR addr)
{
SECTOR_ADDR here;
struct stat st;
int i;
if (fstat(geo->fd,&st) < 0) return 0;
geo_get(geo,st.st_dev,-1,1);
for (i = 0; i < (st.st_size+SECTOR_SIZE-1)/SECTOR_SIZE; i++)
if (geo_comp_addr(geo,i*SECTOR_SIZE,&here))
if (here.sector == addr.sector && here.track == addr.track &&
here.device == addr.device && here.head == addr.head)
if (lseek(geo->fd,i*SECTOR_SIZE,0) < 0) return 0;
else return 1;
return 1;
}