block/partitions/osf.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *  fs/partitions/osf.c
0004  *
0005  *  Code extracted from drivers/block/genhd.c
0006  *
0007  *  Copyright (C) 1991-1998  Linus Torvalds
0008  *  Re-organised Feb 1998 Russell King
0009  */
0010
0011 #include "check.h"
0012
0013 #define MAX_OSF_PARTITIONS 18
0014 #define DISKLABELMAGIC (0x82564557UL)
0015
0016 int osf_partition(struct parsed_partitions *state)
0017 {
0018     int i;
0019     int slot = 1;
0020     unsigned int npartitions;
0021     Sector sect;
0022     unsigned char *data;
0023     struct disklabel {
0024         __le32 d_magic;
0025         __le16 d_type,d_subtype;
0026         u8 d_typename[16];
0027         u8 d_packname[16];
0028         __le32 d_secsize;
0029         __le32 d_nsectors;
0030         __le32 d_ntracks;
0031         __le32 d_ncylinders;
0032         __le32 d_secpercyl;
0033         __le32 d_secprtunit;
0034         __le16 d_sparespertrack;
0035         __le16 d_sparespercyl;
0036         __le32 d_acylinders;
0037         __le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
0038         __le32 d_headswitch, d_trkseek, d_flags;
0039         __le32 d_drivedata[5];
0040         __le32 d_spare[5];
0041         __le32 d_magic2;
0042         __le16 d_checksum;
0043         __le16 d_npartitions;
0044         __le32 d_bbsize, d_sbsize;
0045         struct d_partition {
0046             __le32 p_size;
0047             __le32 p_offset;
0048             __le32 p_fsize;
0049             u8  p_fstype;
0050             u8  p_frag;
0051             __le16 p_cpg;
0052         } d_partitions[MAX_OSF_PARTITIONS];
0053     } * label;
0054     struct d_partition * partition;
0055
0056     data = read_part_sector(state, 0, &sect);
0057     if (!data)
0058         return -1;
0059
0060     label = (struct disklabel *) (data+64);
0061     partition = label->d_partitions;
0062     if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
0063         put_dev_sector(sect);
0064         return 0;
0065     }
0066     if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
0067         put_dev_sector(sect);
0068         return 0;
0069     }
0070     npartitions = le16_to_cpu(label->d_npartitions);
0071     if (npartitions > MAX_OSF_PARTITIONS) {
0072         put_dev_sector(sect);
0073         return 0;
0074     }
0075     for (i = 0 ; i < npartitions; i++, partition++) {
0076         if (slot == state->limit)
0077                 break;
0078         if (le32_to_cpu(partition->p_size))
0079             put_partition(state, slot,
0080                 le32_to_cpu(partition->p_offset),
0081                 le32_to_cpu(partition->p_size));
0082         slot++;
0083     }
0084     strlcat(state->pp_buf, "\n", PAGE_SIZE);
0085     put_dev_sector(sect);
0086     return 1;
0087 }