1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/partitions/ultrix.c 4 * 5 * Code extracted from drivers/block/genhd.c 6 * 7 * Re-organised Jul 1999 Russell King 8 */ 9 10 #include "check.h" 11 12 int ultrix_partition(struct parsed_partitions *state) 13 { 14 int i; 15 Sector sect; 16 unsigned char *data; 17 struct ultrix_disklabel { 18 s32 pt_magic; /* magic no. indicating part. info exits */ 19 s32 pt_valid; /* set by driver if pt is current */ 20 struct pt_info { 21 s32 pi_nblocks; /* no. of sectors */ 22 u32 pi_blkoff; /* block offset for start */ 23 } pt_part[8]; 24 } *label; 25 26 #define PT_MAGIC 0x032957 /* Partition magic number */ 27 #define PT_VALID 1 /* Indicates if struct is valid */ 28 29 data = read_part_sector(state, (16384 - sizeof(*label))/512, §); 30 if (!data) 31 return -1; 32 33 label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label)); 34 35 if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) { 36 for (i=0; i<8; i++) 37 if (label->pt_part[i].pi_nblocks) 38 put_partition(state, i+1, 39 label->pt_part[i].pi_blkoff, 40 label->pt_part[i].pi_nblocks); 41 put_dev_sector(sect); 42 strlcat(state->pp_buf, "\n", PAGE_SIZE); 43 return 1; 44 } else { 45 put_dev_sector(sect); 46 return 0; 47 } 48 } 49