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