706 lines
17 KiB
C
Executable file
706 lines
17 KiB
C
Executable file
/*
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* mformat.c
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*/
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#define DONT_NEED_WAIT
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#include "sysincludes.h"
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#include "msdos.h"
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#include "mtools.h"
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#include "mainloop.h"
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#include "fsP.h"
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#include "file.h"
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#include "plain_io.h"
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#include "nameclash.h"
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#include "buffer.h"
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#include "scsi.h"
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#include "partition.h"
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#ifdef OS_linux
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#include "linux/hdreg.h"
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#define _LINUX_STRING_H_
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#define kdev_t int
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#include "linux/fs.h"
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#undef _LINUX_STRING_H_
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#endif
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#define tolinear(x) \
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(sector(x)-1+(head(x)+cyl(x)*used_dev->heads)*used_dev->sectors)
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static inline void print_hsc(hsc *h)
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{
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printf(" h=%d s=%d c=%d\n",
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head(*h), sector(*h), cyl(*h));
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}
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static void set_offset(hsc *h, int offset, int heads, int sectors)
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{
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int head, sector, cyl;
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if(! heads || !sectors)
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head = sector = cyl = 0; /* linear mode */
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else {
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sector = offset % sectors;
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offset = offset / sectors;
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head = offset % heads;
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cyl = offset / heads;
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if(cyl > 1023) cyl = 1023;
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}
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h->head = head;
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h->sector = ((sector+1) & 0x3f) | ((cyl & 0x300)>>2);
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h->cyl = cyl & 0xff;
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}
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void setBeginEnd(struct partition *partTable, int begin, int end,
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int heads, int sectors, int activate, int type)
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{
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set_offset(&partTable->start, begin, heads, sectors);
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set_offset(&partTable->end, end-1, heads, sectors);
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set_dword(partTable->start_sect, begin);
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set_dword(partTable->nr_sects, end-begin);
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if(activate)
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partTable->boot_ind = 0x80;
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else
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partTable->boot_ind = 0;
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if(!type) {
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if(end-begin < 4096)
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type = 1; /* DOS 12-bit FAT */
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else if(end-begin<32*2048)
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type = 4; /* DOS 16-bit FAT, <32M */
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else
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type = 6; /* DOS 16-bit FAT >= 32M */
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}
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partTable->sys_ind = type;
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}
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int consistencyCheck(struct partition *partTable, int doprint, int verbose,
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int *has_activated, int *last_end, int *j,
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struct device *used_dev, int target_partition)
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{
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int i;
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int inconsistency;
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*j = 0;
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*last_end = 1;
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/* quick consistency check */
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inconsistency = 0;
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*has_activated = 0;
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for(i=1; i<5; i++){
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if(!partTable[i].sys_ind)
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continue;
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if(partTable[i].boot_ind)
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(*has_activated)++;
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if((used_dev &&
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(used_dev->heads != head(partTable[i].end)+1 ||
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used_dev->sectors != sector(partTable[i].end))) ||
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sector(partTable[i].start) != 1){
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fprintf(stderr,
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"Partition %d is not aligned\n",
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i);
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inconsistency=1;
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}
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if(*j && *last_end > BEGIN(partTable[i])) {
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fprintf(stderr,
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"Partitions %d and %d badly ordered or overlapping\n",
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*j,i);
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inconsistency=1;
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}
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*last_end = END(partTable[i]);
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*j = i;
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if(used_dev &&
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cyl(partTable[i].start) != 1023 &&
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tolinear(partTable[i].start) != BEGIN(partTable[i])) {
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fprintf(stderr,
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"Start position mismatch for partition %d\n",
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i);
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inconsistency=1;
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}
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if(used_dev &&
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cyl(partTable[i].end) != 1023 &&
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tolinear(partTable[i].end)+1 != END(partTable[i])) {
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fprintf(stderr,
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"End position mismatch for partition %d\n",
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i);
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inconsistency=1;
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}
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if(doprint && verbose) {
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if(i==target_partition)
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putchar('*');
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else
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putchar(' ');
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printf("Partition %d\n",i);
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printf(" active=%x\n", partTable[i].boot_ind);
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printf(" start:");
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print_hsc(&partTable[i].start);
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printf(" type=0x%x\n", partTable[i].sys_ind);
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printf(" end:");
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print_hsc(&partTable[i].end);
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printf(" start=%d\n", BEGIN(partTable[i]));
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printf(" nr=%d\n", _DWORD(partTable[i].nr_sects));
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printf("\n");
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}
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}
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return inconsistency;
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}
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/* setsize function. Determines scsicam mapping if this cannot be inferred from
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* any existing partitions. Shamelessly snarfed from the Linux kernel ;-) */
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/*
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* Function : static int setsize(unsigned long capacity,unsigned int *cyls,
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* unsigned int *hds, unsigned int *secs);
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*
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* Purpose : to determine a near-optimal int 0x13 mapping for a
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* SCSI disk in terms of lost space of size capacity, storing
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* the results in *cyls, *hds, and *secs.
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*
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* Returns : -1 on failure, 0 on success.
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*
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* Extracted from
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*
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* WORKING X3T9.2
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* DRAFT 792D
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*
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*
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* Revision 6
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* 10-MAR-94
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* Information technology -
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* SCSI-2 Common access method
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* transport and SCSI interface module
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*
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* ANNEX A :
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*
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* setsize() converts a read capacity value to int 13h
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* head-cylinder-sector requirements. It minimizes the value for
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* number of heads and maximizes the number of cylinders. This
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* will support rather large disks before the number of heads
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* will not fit in 4 bits (or 6 bits). This algorithm also
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* minimizes the number of sectors that will be unused at the end
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* of the disk while allowing for very large disks to be
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* accommodated. This algorithm does not use physical geometry.
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*/
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static int setsize(unsigned long capacity,unsigned int *cyls,unsigned int *hds,
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unsigned int *secs) {
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unsigned int rv = 0;
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unsigned long heads, sectors, cylinders, temp;
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cylinders = 1024L; /* Set number of cylinders to max */
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sectors = 62L; /* Maximize sectors per track */
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temp = cylinders * sectors; /* Compute divisor for heads */
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heads = capacity / temp; /* Compute value for number of heads */
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if (capacity % temp) { /* If no remainder, done! */
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heads++; /* Else, increment number of heads */
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temp = cylinders * heads; /* Compute divisor for sectors */
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sectors = capacity / temp; /* Compute value for sectors per
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track */
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if (capacity % temp) { /* If no remainder, done! */
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sectors++; /* Else, increment number of sectors */
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temp = heads * sectors; /* Compute divisor for cylinders */
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cylinders = capacity / temp;/* Compute number of cylinders */
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}
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}
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if (cylinders == 0) rv=(unsigned)-1;/* Give error if 0 cylinders */
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*cyls = (unsigned int) cylinders; /* Stuff return values */
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*secs = (unsigned int) sectors;
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*hds = (unsigned int) heads;
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return(rv);
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}
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static void setsize0(unsigned long capacity,unsigned int *cyls,
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unsigned int *hds, unsigned int *secs)
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{
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int r;
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/* 1. First try "Megabyte" sizes */
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if(capacity < 1024 * 2048 && !(capacity % 1024)) {
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*cyls = capacity >> 11;
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*hds = 64;
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*secs = 32;
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return;
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}
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/* then try scsicam's size */
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r = setsize(capacity,cyls,hds,secs);
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if(r || *hds > 255 || *secs > 63) {
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/* scsicam failed. Do megabytes anyways */
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*cyls = capacity >> 11;
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*hds = 64;
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*secs = 32;
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return;
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}
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}
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static void usage(void)
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{
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fprintf(stderr,
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"Mtools version %s, dated %s\n", mversion, mdate);
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fprintf(stderr,
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"Usage: %s [-pradcv] [-I [-B bootsect-template] [-s sectors] "
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"[-t cylinders] "
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"[-h heads] [-T type] [-b begin] [-l length] "
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"drive\n", progname);
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exit(1);
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}
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void mpartition(int argc, char **argv, int dummy)
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{
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Stream_t *Stream;
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unsigned int dummy2;
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int i,j;
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int sec_per_cyl;
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int doprint = 0;
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int verbose = 0;
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int create = 0;
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int force = 0;
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int length = 0;
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int remove = 0;
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int initialize = 0;
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int tot_sectors=0;
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int type = 0;
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int begin_set = 0;
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int size_set = 0;
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int end_set = 0;
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int last_end = 0;
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int activate = 0;
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int has_activated = 0;
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int inconsistency=0;
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int begin=0;
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int end=0;
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int sizetest=0;
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int dirty = 0;
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int open2flags = NO_OFFSET;
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int c;
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struct device used_dev;
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int argtracks, argheads, argsectors;
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char *drive, name[EXPAND_BUF];
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unsigned char buf[512];
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struct partition *partTable=(struct partition *)(buf+ 0x1ae);
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struct device *dev;
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char errmsg[200];
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char *bootSector=0;
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argtracks = 0;
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argheads = 0;
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argsectors = 0;
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/* get command line options */
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while ((c = getopt(argc, argv, "adprcIT:t:h:s:fvpb:l:S:B:")) != EOF) {
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switch (c) {
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case 'B':
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bootSector = optarg;
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break;
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case 'a':
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/* no privs, as it could be abused to
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* make other partitions unbootable, or
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* to boot a rogue kernel from this one */
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open2flags |= NO_PRIV;
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activate = 1;
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dirty = 1;
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break;
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case 'd':
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activate = -1;
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dirty = 1;
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break;
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case 'p':
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doprint = 1;
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break;
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case 'r':
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remove = 1;
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dirty = 1;
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break;
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case 'I':
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/* could be abused to nuke all other
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* partitions */
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open2flags |= NO_PRIV;
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initialize = 1;
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dirty = 1;
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break;
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case 'c':
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create = 1;
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dirty = 1;
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break;
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case 'T':
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/* could be abused to "manually" create
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* extended partitions */
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open2flags |= NO_PRIV;
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type = strtoul(optarg,0,0);
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break;
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case 't':
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argtracks = atoi(optarg);
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break;
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case 'h':
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argheads = atoi(optarg);
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break;
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case 's':
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argsectors = atoi(optarg);
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break;
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case 'f':
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/* could be abused by creating overlapping
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* partitions and other such Snafu */
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open2flags |= NO_PRIV;
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force = 1;
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break;
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case 'v':
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verbose++;
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break;
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case 'S':
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/* testing only */
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/* could be abused to create partitions
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* extending beyond the actual size of the
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* device */
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open2flags |= NO_PRIV;
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tot_sectors = strtoul(optarg,0,0);
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sizetest = 1;
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break;
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case 'b':
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begin_set = 1;
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begin = atoi(optarg);
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break;
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case 'l':
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size_set = 1;
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length = atoi(optarg);
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break;
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default:
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usage();
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}
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}
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if (argc - optind != 1 || skip_drive(argv[optind]) == argv[optind])
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usage();
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drive = get_drive(argv[optind], NULL);
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/* check out a drive whose letter and parameters match */
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sprintf(errmsg, "Drive '%s:' not supported", drive);
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Stream = 0;
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for(dev=devices;dev->drive;dev++) {
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FREE(&(Stream));
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/* drive letter */
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if (strcmp(dev->drive, drive) != 0)
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continue;
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if (dev->partition < 1 || dev->partition > 4) {
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sprintf(errmsg,
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"Drive '%c:' is not a partition",
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drive);
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continue;
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}
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used_dev = *dev;
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SET_INT(used_dev.tracks, argtracks);
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SET_INT(used_dev.heads, argheads);
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SET_INT(used_dev.sectors, argsectors);
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expand(dev->name, name);
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Stream = SimpleFileOpen(&used_dev, dev, name,
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dirty ? O_RDWR : O_RDONLY,
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errmsg, open2flags, 1, 0);
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if (!Stream) {
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#ifdef HAVE_SNPRINTF
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snprintf(errmsg,199,"init: open: %s", strerror(errno));
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#else
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sprintf(errmsg,"init: open: %s", strerror(errno));
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#endif
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continue;
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}
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/* try to find out the size */
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if(!sizetest)
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tot_sectors = 0;
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if(IS_SCSI(dev)) {
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unsigned char cmd[10];
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unsigned char data[10];
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cmd[0] = SCSI_READ_CAPACITY;
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memset ((void *) &cmd[2], 0, 8);
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memset ((void *) &data[0], 137, 10);
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scsi_cmd(get_fd(Stream), cmd, 10, SCSI_IO_READ,
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data, 10, get_extra_data(Stream));
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tot_sectors = 1 +
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(data[0] << 24) +
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(data[1] << 16) +
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(data[2] << 8) +
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(data[3] );
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if(verbose)
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printf("%d sectors in total\n", tot_sectors);
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}
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#ifdef OS_linux
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if (tot_sectors == 0) {
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ioctl(get_fd(Stream), BLKGETSIZE, &tot_sectors);
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}
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#endif
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/* read the partition table */
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if (READS(Stream, (char *) buf, 0, 512) != 512) {
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#ifdef HAVE_SNPRINTF
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snprintf(errmsg, 199,
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"Error reading from '%s', wrong parameters?",
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name);
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#else
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sprintf(errmsg,
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"Error reading from '%s', wrong parameters?",
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name);
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#endif
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continue;
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}
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if(verbose>=2)
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print_sector("Read sector", buf, 512);
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break;
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}
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/* print error msg if needed */
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if ( dev->drive == 0 ){
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FREE(&Stream);
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fprintf(stderr,"%s: %s\n", argv[0],errmsg);
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exit(1);
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}
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if((used_dev.sectors || used_dev.heads) &&
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(!used_dev.sectors || !used_dev.heads)) {
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fprintf(stderr,"You should either indicate both the number of sectors and the number of heads,\n");
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fprintf(stderr," or none of them\n");
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exit(1);
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}
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if(initialize) {
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if (bootSector) {
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int fd;
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fd = open(bootSector, O_RDONLY);
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if (fd < 0) {
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perror("open boot sector");
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exit(1);
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}
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read(fd, (char *) buf, 512);
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}
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memset((char *)(partTable+1), 0, 4*sizeof(*partTable));
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set_dword(((unsigned char*)buf)+510, 0xaa55);
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}
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/* check for boot signature, and place it if needed */
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if((buf[510] != 0x55) || (buf[511] != 0xaa)) {
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fprintf(stderr,"Boot signature not set\n");
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fprintf(stderr,
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"Use the -I flag to initialize the partition table, and set the boot signature\n");
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inconsistency = 1;
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}
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if(remove){
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if(!partTable[dev->partition].sys_ind)
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fprintf(stderr,
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"Partition for drive %c: does not exist\n",
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drive);
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if((partTable[dev->partition].sys_ind & 0x3f) == 5) {
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fprintf(stderr,
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"Partition for drive %c: may be an extended partition\n",
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drive);
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fprintf(stderr,
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"Use the -f flag to remove it anyways\n");
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inconsistency = 1;
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}
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memset(&partTable[dev->partition], 0, sizeof(*partTable));
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}
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if(create && partTable[dev->partition].sys_ind) {
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fprintf(stderr,
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"Partition for drive %c: already exists\n", drive);
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fprintf(stderr,
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"Use the -r flag to remove it before attempting to recreate it\n");
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}
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/* find out number of heads and sectors, and whether there is
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* any activated partition */
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has_activated = 0;
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for(i=1; i<5; i++){
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if(!partTable[i].sys_ind)
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continue;
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if(partTable[i].boot_ind)
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has_activated++;
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/* set geometry from entry */
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if (!used_dev.heads)
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used_dev.heads = head(partTable[i].end)+1;
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if(!used_dev.sectors)
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used_dev.sectors = sector(partTable[i].end);
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if(i<dev->partition && !begin_set)
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begin = END(partTable[i]);
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if(i>dev->partition && !end_set && !size_set) {
|
|
end = BEGIN(partTable[i]);
|
|
end_set = 1;
|
|
}
|
|
}
|
|
|
|
#ifdef OS_linux
|
|
if(!used_dev.sectors && !used_dev.heads) {
|
|
if(!IS_SCSI(dev)) {
|
|
struct hd_geometry geom;
|
|
if(ioctl(get_fd(Stream), HDIO_GETGEO, &geom) == 0) {
|
|
used_dev.heads = geom.heads;
|
|
used_dev.sectors = geom.sectors;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if(!used_dev.sectors && !used_dev.heads) {
|
|
if(tot_sectors)
|
|
setsize0(tot_sectors,&dummy2,&used_dev.heads,
|
|
&used_dev.sectors);
|
|
else {
|
|
used_dev.heads = 64;
|
|
used_dev.sectors = 32;
|
|
}
|
|
}
|
|
|
|
if(verbose)
|
|
fprintf(stderr,"sectors: %d heads: %d %d\n",
|
|
used_dev.sectors, used_dev.heads, tot_sectors);
|
|
|
|
sec_per_cyl = used_dev.sectors * used_dev.heads;
|
|
if(create) {
|
|
if(!end_set && tot_sectors) {
|
|
end = tot_sectors - tot_sectors % sec_per_cyl;
|
|
end_set = 1;
|
|
}
|
|
|
|
/* if the partition starts right at the beginning of
|
|
* the disk, keep one track unused to allow place for
|
|
* the master boot record */
|
|
if(!begin && !begin_set)
|
|
begin = used_dev.sectors;
|
|
if(!size_set && used_dev.tracks) {
|
|
size_set = 2;
|
|
length = sec_per_cyl * used_dev.tracks;
|
|
|
|
/* round the size in order to take
|
|
* into account any "hidden" sectors */
|
|
|
|
/* do we anchor this at the beginning ?*/
|
|
if(begin_set || dev->partition <= 2 || !end_set)
|
|
length -= begin % sec_per_cyl;
|
|
else if(end - length < begin)
|
|
/* truncate any overlap */
|
|
length = end - begin;
|
|
}
|
|
if(size_set) {
|
|
if(!begin_set && dev->partition >2 && end_set)
|
|
begin = end - length;
|
|
else
|
|
end = begin + length;
|
|
} else if(!end_set) {
|
|
fprintf(stderr,"Unknown size\n");
|
|
exit(1);
|
|
}
|
|
|
|
setBeginEnd(&partTable[dev->partition], begin, end,
|
|
used_dev.heads, used_dev.sectors,
|
|
!has_activated, type);
|
|
}
|
|
|
|
if(activate) {
|
|
if(!partTable[dev->partition].sys_ind) {
|
|
fprintf(stderr,
|
|
"Partition for drive %c: does not exist\n",
|
|
drive);
|
|
} else {
|
|
switch(activate) {
|
|
case 1:
|
|
partTable[dev->partition].boot_ind=0x80;
|
|
break;
|
|
case -1:
|
|
partTable[dev->partition].boot_ind=0x00;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
inconsistency |= consistencyCheck(partTable, doprint, verbose,
|
|
&has_activated, &last_end, &j,
|
|
&used_dev, dev->partition);
|
|
|
|
if(doprint && !inconsistency && partTable[dev->partition].sys_ind) {
|
|
printf("The following command will recreate the partition for drive %c:\n",
|
|
drive);
|
|
used_dev.tracks =
|
|
(_DWORD(partTable[dev->partition].nr_sects) +
|
|
(BEGIN(partTable[dev->partition]) % sec_per_cyl)) /
|
|
sec_per_cyl;
|
|
printf("mpartition -c -t %d -h %d -s %d -b %u %c:\n",
|
|
used_dev.tracks, used_dev.heads, used_dev.sectors,
|
|
BEGIN(partTable[dev->partition]), drive);
|
|
}
|
|
|
|
if(tot_sectors && last_end >tot_sectors) {
|
|
fprintf(stderr,
|
|
"Partition %d exceeds beyond end of disk\n",
|
|
j);
|
|
exit(1);
|
|
}
|
|
|
|
|
|
switch(has_activated) {
|
|
case 0:
|
|
fprintf(stderr,
|
|
"Warning: no active (bootable) partition present\n");
|
|
break;
|
|
case 1:
|
|
break;
|
|
default:
|
|
fprintf(stderr,
|
|
"Warning: %d active (bootable) partitions present\n",
|
|
has_activated);
|
|
fprintf(stderr,
|
|
"Usually, a disk should have exactly one active partition\n");
|
|
break;
|
|
}
|
|
|
|
if(inconsistency && !force) {
|
|
fprintf(stderr,
|
|
"inconsistency detected!\n" );
|
|
if(dirty)
|
|
fprintf(stderr,
|
|
"Retry with the -f switch to go ahead anyways\n");
|
|
exit(1);
|
|
}
|
|
|
|
if(dirty) {
|
|
/* write data back to the disk */
|
|
if(verbose>=2)
|
|
print_sector("Writing sector", buf, 512);
|
|
if (WRITES(Stream, (char *) buf, 0, 512) != 512) {
|
|
fprintf(stderr,"Error writing partition table");
|
|
exit(1);
|
|
}
|
|
if(verbose>=3)
|
|
print_sector("Sector written", buf, 512);
|
|
FREE(&Stream);
|
|
}
|
|
exit(0);
|
|
}
|