| bigbiff bigbiff | e60683a | 2013-02-22 20:55:50 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 Corentin Chary <corentincj@iksaif.net> |
| 3 | * |
| 4 | * This file may be redistributed under the terms of the |
| 5 | * GNU Lesser General Public License. |
| 6 | */ |
| 7 | #include <stdio.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <unistd.h> |
| 10 | #include <string.h> |
| 11 | #include <stdint.h> |
| 12 | |
| 13 | #include "superblocks.h" |
| 14 | |
| 15 | /* |
| 16 | * struct ubifs_ch - common header node. |
| 17 | * @magic: UBIFS node magic number (%UBIFS_NODE_MAGIC) |
| 18 | * @crc: CRC-32 checksum of the node header |
| 19 | * @sqnum: sequence number |
| 20 | * @len: full node length |
| 21 | * @node_type: node type |
| 22 | * @group_type: node group type |
| 23 | * @padding: reserved for future, zeroes |
| 24 | * |
| 25 | * Every UBIFS node starts with this common part. If the node has a key, the |
| 26 | * key always goes next. |
| 27 | */ |
| 28 | struct ubifs_ch { |
| 29 | uint32_t magic; |
| 30 | uint32_t crc; |
| 31 | uint64_t sqnum; |
| 32 | uint32_t len; |
| 33 | uint8_t node_type; |
| 34 | uint8_t group_type; |
| 35 | uint8_t padding[2]; |
| 36 | } __attribute__ ((packed)); |
| 37 | |
| 38 | /* |
| 39 | * struct ubifs_sb_node - superblock node. |
| 40 | * @ch: common header |
| 41 | * @padding: reserved for future, zeroes |
| 42 | * @key_hash: type of hash function used in keys |
| 43 | * @key_fmt: format of the key |
| 44 | * @flags: file-system flags (%UBIFS_FLG_BIGLPT, etc) |
| 45 | * @min_io_size: minimal input/output unit size |
| 46 | * @leb_size: logical eraseblock size in bytes |
| 47 | * @leb_cnt: count of LEBs used by file-system |
| 48 | * @max_leb_cnt: maximum count of LEBs used by file-system |
| 49 | * @max_bud_bytes: maximum amount of data stored in buds |
| 50 | * @log_lebs: log size in logical eraseblocks |
| 51 | * @lpt_lebs: number of LEBs used for lprops table |
| 52 | * @orph_lebs: number of LEBs used for recording orphans |
| 53 | * @jhead_cnt: count of journal heads |
| 54 | * @fanout: tree fanout (max. number of links per indexing node) |
| 55 | * @lsave_cnt: number of LEB numbers in LPT's save table |
| 56 | * @fmt_version: UBIFS on-flash format version |
| 57 | * @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc) |
| 58 | * @padding1: reserved for future, zeroes |
| 59 | * @rp_uid: reserve pool UID |
| 60 | * @rp_gid: reserve pool GID |
| 61 | * @rp_size: size of the reserved pool in bytes |
| 62 | * @padding2: reserved for future, zeroes |
| 63 | * @time_gran: time granularity in nanoseconds |
| 64 | * @uuid: UUID generated when the file system image was created |
| 65 | * @ro_compat_version: UBIFS R/O compatibility version |
| 66 | */ |
| 67 | struct ubifs_sb_node { |
| 68 | struct ubifs_ch ch; |
| 69 | uint8_t padding[2]; |
| 70 | uint8_t key_hash; |
| 71 | uint8_t key_fmt; |
| 72 | uint32_t flags; |
| 73 | uint32_t min_io_size; |
| 74 | uint32_t leb_size; |
| 75 | uint32_t leb_cnt; |
| 76 | uint32_t max_leb_cnt; |
| 77 | uint64_t max_bud_bytes; |
| 78 | uint32_t log_lebs; |
| 79 | uint32_t lpt_lebs; |
| 80 | uint32_t orph_lebs; |
| 81 | uint32_t jhead_cnt; |
| 82 | uint32_t fanout; |
| 83 | uint32_t lsave_cnt; |
| 84 | uint32_t fmt_version; |
| 85 | uint16_t default_compr; |
| 86 | uint8_t padding1[2]; |
| 87 | uint32_t rp_uid; |
| 88 | uint32_t rp_gid; |
| 89 | uint64_t rp_size; |
| 90 | uint32_t time_gran; |
| 91 | uint8_t uuid[16]; |
| 92 | uint32_t ro_compat_version; |
| 93 | uint8_t padding2[3968]; |
| 94 | } __attribute__ ((packed)); |
| 95 | |
| 96 | static int probe_ubifs(blkid_probe pr, const struct blkid_idmag *mag) |
| 97 | { |
| 98 | struct ubifs_sb_node *sb; |
| 99 | |
| 100 | sb = blkid_probe_get_sb(pr, mag, struct ubifs_sb_node); |
| 101 | if (!sb) |
| 102 | return -1; |
| 103 | |
| 104 | blkid_probe_set_uuid(pr, sb->uuid); |
| 105 | blkid_probe_sprintf_version(pr, "w%dr%d", |
| 106 | sb->fmt_version, sb->ro_compat_version); |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | const struct blkid_idinfo ubifs_idinfo = |
| 111 | { |
| 112 | .name = "ubifs", |
| 113 | .usage = BLKID_USAGE_FILESYSTEM, |
| 114 | .probefunc = probe_ubifs, |
| 115 | .magics = |
| 116 | { |
| 117 | { .magic = "\x31\x18\x10\x06", .len = 4 }, |
| 118 | { NULL } |
| 119 | } |
| 120 | }; |