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#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <disklabel.h>
#include <sys/ioctl.h>
#include <linux/hdreg.h>
#include "library.h"
/* from linux/fs.h */
#define BLKSSZGET _IO(0x12,104) /* get block device sector size */
#define BLKGETSIZE _IO(0x12,96) /* return device size */
int label_modified=0;
int force=0;
int
write_disklabel (int fd,struct disklabel *d)
{
dosumlabel(fd,d);
if(lseek(fd,LABELOFFSET,SEEK_SET)<0) {
return -1;
}
if(write(fd,d,sizeof(*d))!=sizeof(*d)) {
return -1;
}
return 0;
}
void
fixmagic (int fd,struct disklabel *d)
{
d->d_magic=DISKLABELMAGIC;
d->d_magic2=DISKLABELMAGIC;
d->d_type=DTYPE_SCSI;
d->d_secsize=512;
strcpy(d->d_typename,"SCSI");
}
void
zero_disklabel (int fd,struct disklabel *d)
{
memset(d,0,sizeof(*d));
fixmagic(fd,d);
label_modified=1;
}
void
print_disklabel(int fd,struct disklabel *d)
{
int x;
for(x=0;x<d->d_npartitions;x++) {
printf("partition %d: type %d, starts sector %d, size %d\n",
x, d->d_partitions[x].p_fstype,
d->d_partitions[x].p_offset, d->d_partitions[x].p_size);
}
}
int total_disk_size, heads, sectors, cylinders;
/* FIXME: use BLKSSZGET to get sector size. (depends on linux >=2.4) */
int sector_size=512;
#ifdef __linux__
void
set_disk_size (int fd)
{
struct hd_geometry hd;
unsigned long blocks;
unsigned int sectors_per_block;
int r1, r2;
sectors_per_block = sector_size / 512;
heads = sectors = cylinders = blocks = 0;
r1 = ioctl(fd,HDIO_GETGEO,&hd);
if (r1) {
perror("ioctl HDIO_GETGEO");
} else {
heads = hd.heads;
sectors = hd.sectors;
cylinders = hd.cylinders;
if (heads * sectors * cylinders == 0) { r1 = -1; }
/* fdisk says: "never use hd.cylinders - it is truncated"
if BLKGETSIZE works we'll calculate our own value for
cylinders in a little bit, but for now, use it anyway */
total_disk_size=(heads*sectors*cylinders); /* in sectors */
}
r2 = ioctl(fd,BLKGETSIZE, &blocks);
if (r2) {
perror("ioctl BLKGETSIZE");
}
if (r1 && r2) {
if (!total_disk_size) {
fprintf(stderr, "Unable to get disk size. Please specify it with the size [size_in_sectors] option.\n\n");
}
return;
}
if (r1 == 0 && r2 == 0) {
total_disk_size = blocks; /* sizes in sectors */
cylinders = blocks / (heads * sectors);
cylinders /= sectors_per_block;
} else if (r1 == 0) {
fprintf(stderr, "Unable to get disk geometry. Guessing number of sectors from disk size.\n");
cylinders = heads = 1;
sectors = blocks / sectors_per_block;
}
fprintf(stderr,"%d heads, %d sectors, %d cylinders %dK total size\n",
heads, sectors, cylinders, total_disk_size/2);
}
#endif
int
set_partition (int fd,struct disklabel *d,int num,int offset,int size,int fstype)
{
int endplace=offset+size;
int x;
if(endplace>total_disk_size) {
fprintf(stderr,"endplace is %d total_disk_size is %d\n",endplace,total_disk_size);
if (!force) return -1;
/* correct the discrepancy */
size = total_disk_size-offset;
endplace=total_disk_size;
fprintf(stderr,"Warning: changing endplace to %d and size to %d\n",endplace,size);
}
if(num>d->d_npartitions) {
fprintf(stderr,"Partition not consecutive! This would leave empty partitions.\nNext unset partition is %d.\n",d->d_npartitions);
if (!force) return -1;
}
x=overlaplabel(d,offset,endplace,1U<<num);
if(x!=-1)
fprintf(stderr,"Warning: added partition %d overlaps with partition %d\n",num,x);
d->d_partitions[num].p_offset=offset;
d->d_partitions[num].p_size=size;
d->d_partitions[num].p_fstype=fstype;
if(num==d->d_npartitions) {
d->d_npartitions++;
}
label_modified=1;
return 0;
}
void
usage (char *cmd_name)
{
fprintf(stderr,"Usage: %s drive print\n",cmd_name);
fprintf(stderr," %s drive zero\n",cmd_name);
fprintf(stderr," %s drive partition_number offset_in_sectors size_in_sectors partition_type\n",cmd_name);
fprintf(stderr," %s drive sum\n",cmd_name);
fprintf(stderr," %s drive size size_in_sectors [other command]\n\n",cmd_name);
fprintf(stderr,"The print command may be placed before or after any other command.\n");
fprintf(stderr,"The size command is used to override the size of the disk, if the\nprogram isn't able to obtain this information for some reason.\n");
fprintf(stderr,"The partition type should be 8, unless you are creating\nlabels for OSF/1 partitions.\n");
}
int
main (int argc,char **argv)
{
struct disklabel d;
int fd,x;
if(argc < 3) {
usage(argv[0]);
exit(1);
}
fd=open(argv[1],O_RDWR);
if(fd<0) {
perror("couldn't open scsi disk");
exit(1);
}
#ifdef __linux__
set_disk_size(fd);
#endif
if(strcmp(argv[2],"zero")==0) {
zero_disklabel(fd,&d);
} else {
if(read_disklabel(fd,&d)) {
fprintf(stderr,"Error reading disklabel\n");
exit(1);
}
}
for(x=2;x<argc;) {
if(strcmp(argv[x],"size")==0 && ((x+1)<argc)) {
total_disk_size=atoi(argv[x+1]);
x+=2;
}
if(strcmp(argv[x],"sum")==0) {
dosumlabel(fd,&d);
x++;
}
else if(strcmp(argv[x],"zero")==0) {
zero_disklabel(fd,&d);
x++;
}
else if(strcmp(argv[x],"print")==0) {
print_disklabel(fd,&d);
x++;
}
else if(strcmp(argv[x],"force")==0) {
force=1;
x++;
}
else {
if((argc-x)>3 && isdigit(argv[x][0]) && isdigit(argv[x+1][0]) && isdigit(argv[x+2][0]) && isdigit(argv[x+3][0])) {
int partnum=atoi(argv[x]);
int offset=atoi(argv[x+1]);
int size=atoi(argv[x+2]);
int fstype=atoi(argv[x+3]);
if(partnum<0 || partnum>7) {
fprintf(stderr,"Partition number %d out of range--partitions should be between 0 and 7\n",partnum);
exit(1);
}
if(set_partition(fd,&d,partnum,offset,size,fstype)) {
fprintf(stderr,"Set of partition failed\n");
exit(1);
}
x+=4;
} else {
fprintf(stderr,"Unrecognized option %s\n",argv[x]);
usage(argv[0]);
exit(1);
}
}
}
if(label_modified && write_disklabel(fd,&d)) {
fprintf(stderr,"Error writing disklabel\n");
exit(1);
}
return 0;
}
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