| Serj Kalichev | d42cdc2 | 2016-08-29 18:28:34 +0300 | [diff] [blame^] | 1 | /* |
| 2 | * volume_id - reads filesystem label and uuid |
| 3 | * |
| 4 | * Copyright (C) 2012 S-G Bergh <sgb@systemasis.org> |
| 5 | * |
| 6 | * Licensed under GPLv2, see file LICENSE in this source tree. |
| 7 | */ |
| 8 | |
| 9 | //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_UBIFS) += ubifs.o |
| 10 | |
| 11 | //config: |
| 12 | //config:config FEATURE_VOLUMEID_UBIFS |
| 13 | //config: bool "UBIFS filesystem" |
| 14 | //config: default y |
| 15 | //config: depends on VOLUMEID |
| 16 | //config: help |
| 17 | //config: UBIFS (Unsorted Block Image File System) is a file |
| 18 | //config: system for use with raw flash memory media. |
| 19 | //config: |
| 20 | |
| 21 | #include "volume_id_internal.h" |
| 22 | |
| 23 | #define UBIFS_NODE_MAGIC 0x06101831 |
| 24 | |
| 25 | /* |
| 26 | * struct ubifs_ch - common header node. |
| 27 | * @magic: UBIFS node magic number (%UBIFS_NODE_MAGIC) |
| 28 | * @crc: CRC-32 checksum of the node header |
| 29 | * @sqnum: sequence number |
| 30 | * @len: full node length |
| 31 | * @node_type: node type |
| 32 | * @group_type: node group type |
| 33 | * @padding: reserved for future, zeroes |
| 34 | * |
| 35 | * Every UBIFS node starts with this common part. If the node has a key, the |
| 36 | * key always goes next. |
| 37 | */ |
| 38 | struct ubifs_ch { |
| 39 | uint32_t magic; |
| 40 | uint32_t crc; |
| 41 | uint64_t sqnum; |
| 42 | uint32_t len; |
| 43 | uint8_t node_type; |
| 44 | uint8_t group_type; |
| 45 | uint8_t padding[2]; |
| 46 | } PACKED; |
| 47 | |
| 48 | /* |
| 49 | * struct ubifs_sb_node - superblock node. |
| 50 | * @ch: common header |
| 51 | * @padding: reserved for future, zeroes |
| 52 | * @key_hash: type of hash function used in keys |
| 53 | * @key_fmt: format of the key |
| 54 | * @flags: file-system flags (%UBIFS_FLG_BIGLPT, etc) |
| 55 | * @min_io_size: minimal input/output unit size |
| 56 | * @leb_size: logical eraseblock size in bytes |
| 57 | * @leb_cnt: count of LEBs used by file-system |
| 58 | * @max_leb_cnt: maximum count of LEBs used by file-system |
| 59 | * @max_bud_bytes: maximum amount of data stored in buds |
| 60 | * @log_lebs: log size in logical eraseblocks |
| 61 | * @lpt_lebs: number of LEBs used for lprops table |
| 62 | * @orph_lebs: number of LEBs used for recording orphans |
| 63 | * @jhead_cnt: count of journal heads |
| 64 | * @fanout: tree fanout (max. number of links per indexing node) |
| 65 | * @lsave_cnt: number of LEB numbers in LPT's save table |
| 66 | * @fmt_version: UBIFS on-flash format version |
| 67 | * @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc) |
| 68 | * @padding1: reserved for future, zeroes |
| 69 | * @rp_uid: reserve pool UID |
| 70 | * @rp_gid: reserve pool GID |
| 71 | * @rp_size: size of the reserved pool in bytes |
| 72 | * @padding2: reserved for future, zeroes |
| 73 | * @time_gran: time granularity in nanoseconds |
| 74 | * @uuid: UUID generated when the file system image was created |
| 75 | * @ro_compat_version: UBIFS R/O compatibility version |
| 76 | */ |
| 77 | struct ubifs_sb_node { |
| 78 | struct ubifs_ch ch; |
| 79 | uint8_t padding[2]; |
| 80 | uint8_t key_hash; |
| 81 | uint8_t key_fmt; |
| 82 | uint32_t flags; |
| 83 | uint32_t min_io_size; |
| 84 | uint32_t leb_size; |
| 85 | uint32_t leb_cnt; |
| 86 | uint32_t max_leb_cnt; |
| 87 | uint64_t max_bud_bytes; |
| 88 | uint32_t log_lebs; |
| 89 | uint32_t lpt_lebs; |
| 90 | uint32_t orph_lebs; |
| 91 | uint32_t jhead_cnt; |
| 92 | uint32_t fanout; |
| 93 | uint32_t lsave_cnt; |
| 94 | uint32_t fmt_version; |
| 95 | uint16_t default_compr; |
| 96 | uint8_t padding1[2]; |
| 97 | uint32_t rp_uid; |
| 98 | uint32_t rp_gid; |
| 99 | uint64_t rp_size; |
| 100 | uint32_t time_gran; |
| 101 | uint8_t uuid[16]; |
| 102 | uint32_t ro_compat_version; |
| 103 | /* |
| 104 | uint8_t padding2[3968]; |
| 105 | */ |
| 106 | } PACKED; |
| 107 | |
| 108 | int FAST_FUNC volume_id_probe_ubifs(struct volume_id *id /*,uint64_t off*/) |
| 109 | { |
| 110 | #define off ((uint64_t)0) |
| 111 | struct ubifs_sb_node *sb; |
| 112 | |
| 113 | dbg("UBIFS: probing at offset 0x%llx", (unsigned long long) off); |
| 114 | sb = volume_id_get_buffer(id, off, sizeof(struct ubifs_sb_node)); |
| 115 | if (!sb) |
| 116 | return -1; |
| 117 | |
| 118 | if (le32_to_cpu(sb->ch.magic) != UBIFS_NODE_MAGIC) |
| 119 | return -1; |
| 120 | |
| 121 | IF_FEATURE_BLKID_TYPE(id->type = "ubifs";) |
| 122 | volume_id_set_uuid(id, sb->uuid, UUID_DCE); |
| 123 | |
| 124 | return 0; |
| 125 | } |