fa6c4a2580
Also following functionality was added: - Add install_master to the installboot from NetBSD. - Check if enough space for bootxx. Old installboot was renamed to installboot_minix.
142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/bootblock.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#ifndef DFL_SECSIZE
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#define DFL_SECSIZE 512
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#endif
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#define MFS_FIRST_SUBP_OFFSET 32
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static int minixfs3_read_mbr(const char* device, char* buf)
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{
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int fd;
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int bytes;
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int n;
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fd = open(device, O_RDONLY);
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if (fd == -1) {
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fprintf(stderr, "Can't open %s: %s\n", device, strerror(errno));
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return 1;
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}
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if (lseek(fd, MBR_PART_OFFSET, SEEK_SET) != MBR_PART_OFFSET) {
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fprintf(stderr, "Can't seek in %s to %d: %s\n",
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device, MBR_PART_OFFSET, strerror(errno));
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close(fd);
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return 1;
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}
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bytes = DFL_SECSIZE - MBR_PART_OFFSET;
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if ((n = read(fd, buf, bytes)) != bytes) {
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fprintf(stderr, "Can't read %d bytes from %s, %d read instead"
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": %s\n",
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bytes, device, n, strerror(errno));
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close(fd);
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return 1;
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}
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if ((uint8_t)buf[bytes-2] != 0x55 || (uint8_t)buf[bytes-1] != 0xAA) {
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fprintf(stderr, "No MBR on %s, signature is %x\n",
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device, *(uint16_t*)(&buf[bytes-2]));
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close(fd);
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return 1;
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}
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close(fd);
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return 0;
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}
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int minixfs3_is_minix_partition(const char* partition)
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{
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char buf[DFL_SECSIZE]; /* part table + signature */
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int name_length = strlen(partition);
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/* partition must be 0-3 */
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if (atol(&partition[name_length-1]) >= 4) {
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fprintf(stderr, "Wrong device %s, must be /.../cxdyp[0-3]\n",
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partition);
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return 0;
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}
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/* it should be partition device, not disk */
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if (partition[name_length-2] != 'p') {
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fprintf(stderr, "Wrong device %s, must be /.../cxdyp[0-3]\n",
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partition);
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return 0;
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}
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/* MINIX 3 partition with current scheme *must* have subpartitions,
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* thus MBR has signature. minixfs3_read_mbr checks the signature.
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*/
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if (minixfs3_read_mbr(partition, buf))
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return 0;
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return 1;
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}
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/* bootxx from NetBSD is ~8Kb, and old MINIX installations have just
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* 1Kb of space for their bootblock. Check if there is enough space
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* to install bootxx_minixfs3. New installation should have 16Kb before
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* the first subpartition.
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*/
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int minixfs3_has_bootblock_space(const char* partition)
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{
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char buf[DFL_SECSIZE]; /* part table + signature */
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char disk[NAME_MAX];
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struct mbr_partition *part;
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uint32_t first_subpartition = (uint32_t) ~0;
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uint32_t parent_partition = 0;
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int i;
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int name_length = strlen(partition);
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/* partition must be 0-3 */
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if (atol(&partition[name_length-1]) >= 4) {
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fprintf(stderr, "Wrong device %s, must be /.../cxdyp[0-3]\n",
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partition);
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exit(1);
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}
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/* it should be partition device, not disk */
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if (partition[name_length-2] != 'p') {
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fprintf(stderr, "Wrong device %s, must be /.../cxdyp[0-3]\n",
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partition);
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exit(1);
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}
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if (minixfs3_read_mbr(partition, buf))
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exit(1);
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part = (struct mbr_partition *) buf;
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for (i = 0; i < 4; i++) {
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if (part[i].mbrp_size && part[i].mbrp_start < first_subpartition)
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first_subpartition = part[i].mbrp_start;
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}
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strncpy(disk, partition, name_length - 2);
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disk[name_length - 2] = '\0';
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if (minixfs3_read_mbr(disk, buf))
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exit(1);
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for (i = 0; i < 4; i++) {
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struct mbr_partition *p = &part[i];
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if (p->mbrp_size && p->mbrp_start <= first_subpartition
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&& (p->mbrp_start + p->mbrp_size) > first_subpartition) {
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parent_partition = p->mbrp_start;
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break;
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}
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}
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if ((first_subpartition - parent_partition) < MFS_FIRST_SUBP_OFFSET)
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return 0;
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else
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return 1;
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}
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