1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/partitions/osf.c 4 * 5 * Code extracted from drivers/block/genhd.c 6 * 7 * Copyright (C) 1991-1998 Linus Torvalds 8 * Re-organised Feb 1998 Russell King 9 */ 10 11 #include "check.h" 12 13 #define MAX_OSF_PARTITIONS 18 14 #define DISKLABELMAGIC (0x82564557UL) 15 16 int osf_partition(struct parsed_partitions *state) 17 { 18 int i; 19 int slot = 1; 20 unsigned int npartitions; 21 Sector sect; 22 unsigned char *data; 23 struct disklabel { 24 __le32 d_magic; 25 __le16 d_type,d_subtype; 26 u8 d_typename[16]; 27 u8 d_packname[16]; 28 __le32 d_secsize; 29 __le32 d_nsectors; 30 __le32 d_ntracks; 31 __le32 d_ncylinders; 32 __le32 d_secpercyl; 33 __le32 d_secprtunit; 34 __le16 d_sparespertrack; 35 __le16 d_sparespercyl; 36 __le32 d_acylinders; 37 __le16 d_rpm, d_interleave, d_trackskew, d_cylskew; 38 __le32 d_headswitch, d_trkseek, d_flags; 39 __le32 d_drivedata[5]; 40 __le32 d_spare[5]; 41 __le32 d_magic2; 42 __le16 d_checksum; 43 __le16 d_npartitions; 44 __le32 d_bbsize, d_sbsize; 45 struct d_partition { 46 __le32 p_size; 47 __le32 p_offset; 48 __le32 p_fsize; 49 u8 p_fstype; 50 u8 p_frag; 51 __le16 p_cpg; 52 } d_partitions[MAX_OSF_PARTITIONS]; 53 } * label; 54 struct d_partition * partition; 55 56 data = read_part_sector(state, 0, §); 57 if (!data) 58 return -1; 59 60 label = (struct disklabel *) (data+64); 61 partition = label->d_partitions; 62 if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) { 63 put_dev_sector(sect); 64 return 0; 65 } 66 if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) { 67 put_dev_sector(sect); 68 return 0; 69 } 70 npartitions = le16_to_cpu(label->d_npartitions); 71 if (npartitions > MAX_OSF_PARTITIONS) { 72 put_dev_sector(sect); 73 return 0; 74 } 75 for (i = 0 ; i < npartitions; i++, partition++) { 76 if (slot == state->limit) 77 break; 78 if (le32_to_cpu(partition->p_size)) 79 put_partition(state, slot, 80 le32_to_cpu(partition->p_offset), 81 le32_to_cpu(partition->p_size)); 82 slot++; 83 } 84 strlcat(state->pp_buf, "\n", PAGE_SIZE); 85 put_dev_sector(sect); 86 return 1; 87 } 88