| bigbiff bigbiff | e60683a | 2013-02-22 20:55:50 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Karel Zak <kzak@redhat.com> |
| 3 | * |
| 4 | * This is written from sratch according to Linux kernel fs/sysv/super.c file. |
| 5 | * It seems that sysv probing code in libvolume_id and also in the original |
| 6 | * blkid is useless. |
| 7 | * |
| 8 | * This file may be redistributed under the terms of the |
| 9 | * GNU Lesser General Public License. |
| 10 | */ |
| 11 | #include <stdio.h> |
| 12 | #include <stdlib.h> |
| 13 | #include <unistd.h> |
| 14 | #include <stdint.h> |
| 15 | #include <stddef.h> |
| 16 | |
| 17 | #include "superblocks.h" |
| 18 | |
| 19 | #define XENIX_NICINOD 100 |
| 20 | #define XENIX_NICFREE 100 |
| 21 | |
| 22 | struct xenix_super_block { |
| 23 | uint16_t s_isize; |
| 24 | uint32_t s_fsize; |
| 25 | uint16_t s_nfree; |
| 26 | uint32_t s_free[XENIX_NICFREE]; |
| 27 | uint16_t s_ninode; |
| 28 | uint16_t s_inode[XENIX_NICINOD]; |
| 29 | uint8_t s_flock; |
| 30 | uint8_t s_ilock; |
| 31 | uint8_t s_fmod; |
| 32 | uint8_t s_ronly; |
| 33 | uint32_t s_time; |
| 34 | uint32_t s_tfree; |
| 35 | uint16_t s_tinode; |
| 36 | uint16_t s_dinfo[4]; |
| 37 | uint8_t s_fname[6]; |
| 38 | uint8_t s_fpack[6]; |
| 39 | uint8_t s_clean; |
| 40 | uint8_t s_fill[371]; |
| 41 | uint32_t s_magic; |
| 42 | uint32_t s_type; |
| 43 | } __attribute__((packed)); |
| 44 | |
| 45 | |
| 46 | #define SYSV_NICINOD 100 |
| 47 | #define SYSV_NICFREE 50 |
| 48 | |
| 49 | struct sysv_super_block |
| 50 | { |
| 51 | uint16_t s_isize; |
| 52 | uint16_t s_pad0; |
| 53 | uint32_t s_fsize; |
| 54 | uint16_t s_nfree; |
| 55 | uint16_t s_pad1; |
| 56 | uint32_t s_free[SYSV_NICFREE]; |
| 57 | uint16_t s_ninode; |
| 58 | uint16_t s_pad2; |
| 59 | uint16_t s_inode[SYSV_NICINOD]; |
| 60 | uint8_t s_flock; |
| 61 | uint8_t s_ilock; |
| 62 | uint8_t s_fmod; |
| 63 | uint8_t s_ronly; |
| 64 | uint32_t s_time; |
| 65 | uint16_t s_dinfo[4]; |
| 66 | uint32_t s_tfree; |
| 67 | uint16_t s_tinode; |
| 68 | uint16_t s_pad3; |
| 69 | uint8_t s_fname[6]; |
| 70 | uint8_t s_fpack[6]; |
| 71 | uint32_t s_fill[12]; |
| 72 | uint32_t s_state; |
| 73 | uint32_t s_magic; |
| 74 | uint32_t s_type; |
| 75 | }; |
| 76 | |
| 77 | static int probe_xenix(blkid_probe pr, const struct blkid_idmag *mag) |
| 78 | { |
| 79 | struct xenix_super_block *sb; |
| 80 | |
| 81 | sb = blkid_probe_get_sb(pr, mag, struct xenix_super_block); |
| 82 | if (!sb) |
| 83 | return -1; |
| 84 | blkid_probe_set_label(pr, sb->s_fname, sizeof(sb->s_fname)); |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | #define SYSV_BLOCK_SIZE 1024 |
| 89 | |
| 90 | /* Note that we don't probe for Coherent FS, this FS does not have |
| 91 | * magic string. (It requires to probe fname/fpack field..) |
| 92 | */ |
| 93 | static int probe_sysv(blkid_probe pr, |
| 94 | const struct blkid_idmag *mag __attribute__((__unused__))) |
| 95 | { |
| 96 | struct sysv_super_block *sb; |
| 97 | int blocks[] = {0, 9, 15, 18}; |
| 98 | size_t i; |
| 99 | |
| 100 | for (i = 0; i < ARRAY_SIZE(blocks); i++) { |
| 101 | int off = blocks[i] * SYSV_BLOCK_SIZE + SYSV_BLOCK_SIZE/2; |
| 102 | |
| 103 | sb = (struct sysv_super_block *) |
| 104 | blkid_probe_get_buffer(pr, |
| 105 | off, |
| 106 | sizeof(struct sysv_super_block)); |
| 107 | if (!sb) |
| 108 | return -1; |
| 109 | |
| 110 | if (sb->s_magic == cpu_to_le32(0xfd187e20) || |
| 111 | sb->s_magic == cpu_to_be32(0xfd187e20)) { |
| 112 | |
| 113 | if (blkid_probe_set_label(pr, sb->s_fname, |
| 114 | sizeof(sb->s_fname))) |
| 115 | return -1; |
| 116 | |
| 117 | if (blkid_probe_set_magic(pr, |
| 118 | off + offsetof(struct sysv_super_block, |
| 119 | s_magic), |
| 120 | sizeof(sb->s_magic), |
| 121 | (unsigned char *) &sb->s_magic)) |
| 122 | return -1; |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | } |
| 127 | return 1; |
| 128 | } |
| 129 | |
| 130 | const struct blkid_idinfo xenix_idinfo = |
| 131 | { |
| 132 | .name = "xenix", |
| 133 | .usage = BLKID_USAGE_FILESYSTEM, |
| 134 | .probefunc = probe_xenix, |
| 135 | .magics = |
| 136 | { |
| 137 | { .magic = "\x2b\x55\x44", .len = 3, .kboff = 1, .sboff = 0x400 }, |
| 138 | { .magic = "\x44\x55\x2b", .len = 3, .kboff = 1, .sboff = 0x400 }, |
| 139 | { NULL } |
| 140 | } |
| 141 | }; |
| 142 | |
| 143 | const struct blkid_idinfo sysv_idinfo = |
| 144 | { |
| 145 | .name = "sysv", |
| 146 | .usage = BLKID_USAGE_FILESYSTEM, |
| 147 | .probefunc = probe_sysv, |
| 148 | |
| 149 | /* SYSV is BE and LE and superblock could be on four positions. It's |
| 150 | * simpler to probe for the magic string by .probefunc(). |
| 151 | */ |
| 152 | .magics = BLKID_NONE_MAGIC |
| 153 | }; |
| 154 | |