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-m<MB> feature to know how big things have to me.

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write 2kB of zeroes at the start of new partitions to clear out old gunk
(such as subpartitioning or old boot code).
This commit is contained in:
Ben Gras 2005-09-09 13:23:24 +00:00
parent 852a2c9832
commit 0e809f9c08
1 changed files with 24 additions and 8 deletions
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32
commands/ibm/autopart.c
View file

@ -59,8 +59,9 @@ Num Sort Type
#define DEV_FD0 0x200 /* Device number of /dev/fd0 */
#define DEV_C0D0 0x300 /* Device number of /dev/c0d0 */
#define MIN_REGION_MB 500
#define MIN_REGION_SECTORS (1024*1024*MIN_REGION_MB/SECTOR_SIZE)
int min_region_mb = 500;
#define MIN_REGION_SECTORS (1024*1024*min_region_mb/SECTOR_SIZE)
#define MAX_REGION_MB 4095
#define MAX_REGION_SECTORS (1024*(1024/SECTOR_SIZE)*MAX_REGION_MB)
@ -2509,7 +2510,7 @@ select_disk(void)
}
int
scribble_region(region_t *reg, struct part_entry **pe)
scribble_region(region_t *reg, struct part_entry **pe, int *made_new)
{
int ex, trunc = 0, changed = 0, i;
struct part_entry *newpart;
@ -2527,7 +2528,8 @@ scribble_region(region_t *reg, struct part_entry **pe)
changed = 1;
cylinderalign(reg);
}
}
if(made_new) *made_new = 1;
} else if(made_new) *made_new = 0;
#if 0
if(trunc) {
printf("\nWill only use %dMB.\n", MAX_REGION_MB);
@ -2605,7 +2607,7 @@ do_autopart(int resultfd)
struct part_entry *pe;
char sure[50];
struct part_entry orig_table[1 + NR_PARTITIONS];
int region, disk;
int region, disk, newp;
nordonly = 1;
@ -2629,13 +2631,12 @@ do_autopart(int resultfd)
} while(!r); /* Back to step 2. */
/* Write things. */
if(scribble_region(r, &pe)) {
if(scribble_region(r, &pe, &newp)) {
char *name;
int i, found = -1;
char partbuf[100], devname[100];
struct part_entry *tpe;
printstep(3, "Confirm your choices");
region = (int)(r-regions);
@ -2708,6 +2709,18 @@ do_autopart(int resultfd)
fprintf(stderr, "Autopart internal error (disk sanity check failed).\n");
exit(1);
}
if(newp) {
int fd;
if((fd=open(devname, O_WRONLY)) < 0) {
perror(devname);
} else {
/* Clear any subpartitioning. */
static char sub[2048];
write(fd, sub, sizeof(sub));
close(fd);
}
}
return 0;
}
@ -2782,8 +2795,11 @@ int main(int argc, char **argv)
} else {
int c;
/* autopart uses getopt() */
while((c = getopt(argc, argv, "f:")) != EOF) {
while((c = getopt(argc, argv, "m:f:")) != EOF) {
switch(c) {
case 'm':
min_region_mb = atoi(optarg);
break;
case 'f':
/* Make sure old data file is gone. */
unlink(optarg);