124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
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/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2012 S-G Bergh <sgb@systemasis.org>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_UBIFS) += ubifs.o
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//config:config FEATURE_VOLUMEID_UBIFS
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//config: bool "UBIFS filesystem"
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//config: default y
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//config: depends on VOLUMEID
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//config: help
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//config: UBIFS (Unsorted Block Image File System) is a file
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//config: system for use with raw flash memory media.
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#include "volume_id_internal.h"
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#define UBIFS_NODE_MAGIC 0x06101831
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/*
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* struct ubifs_ch - common header node.
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* @magic: UBIFS node magic number (%UBIFS_NODE_MAGIC)
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* @crc: CRC-32 checksum of the node header
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* @sqnum: sequence number
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* @len: full node length
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* @node_type: node type
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* @group_type: node group type
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* @padding: reserved for future, zeroes
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*
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* Every UBIFS node starts with this common part. If the node has a key, the
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* key always goes next.
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*/
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struct ubifs_ch {
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uint32_t magic;
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uint32_t crc;
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uint64_t sqnum;
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uint32_t len;
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uint8_t node_type;
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uint8_t group_type;
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uint8_t padding[2];
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} PACKED;
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/*
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* struct ubifs_sb_node - superblock node.
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* @ch: common header
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* @padding: reserved for future, zeroes
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* @key_hash: type of hash function used in keys
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* @key_fmt: format of the key
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* @flags: file-system flags (%UBIFS_FLG_BIGLPT, etc)
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* @min_io_size: minimal input/output unit size
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* @leb_size: logical eraseblock size in bytes
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* @leb_cnt: count of LEBs used by file-system
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* @max_leb_cnt: maximum count of LEBs used by file-system
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* @max_bud_bytes: maximum amount of data stored in buds
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* @log_lebs: log size in logical eraseblocks
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* @lpt_lebs: number of LEBs used for lprops table
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* @orph_lebs: number of LEBs used for recording orphans
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* @jhead_cnt: count of journal heads
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* @fanout: tree fanout (max. number of links per indexing node)
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* @lsave_cnt: number of LEB numbers in LPT's save table
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* @fmt_version: UBIFS on-flash format version
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* @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc)
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* @padding1: reserved for future, zeroes
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* @rp_uid: reserve pool UID
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* @rp_gid: reserve pool GID
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* @rp_size: size of the reserved pool in bytes
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* @padding2: reserved for future, zeroes
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* @time_gran: time granularity in nanoseconds
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* @uuid: UUID generated when the file system image was created
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* @ro_compat_version: UBIFS R/O compatibility version
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*/
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struct ubifs_sb_node {
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struct ubifs_ch ch;
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uint8_t padding[2];
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uint8_t key_hash;
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uint8_t key_fmt;
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uint32_t flags;
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uint32_t min_io_size;
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uint32_t leb_size;
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uint32_t leb_cnt;
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uint32_t max_leb_cnt;
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uint64_t max_bud_bytes;
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uint32_t log_lebs;
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uint32_t lpt_lebs;
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uint32_t orph_lebs;
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uint32_t jhead_cnt;
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uint32_t fanout;
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uint32_t lsave_cnt;
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uint32_t fmt_version;
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uint16_t default_compr;
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uint8_t padding1[2];
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uint32_t rp_uid;
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uint32_t rp_gid;
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uint64_t rp_size;
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uint32_t time_gran;
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uint8_t uuid[16];
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uint32_t ro_compat_version;
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/*
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uint8_t padding2[3968];
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*/
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} PACKED;
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int FAST_FUNC volume_id_probe_ubifs(struct volume_id *id /*,uint64_t off*/)
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{
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#define off ((uint64_t)0)
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struct ubifs_sb_node *sb;
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dbg("UBIFS: probing at offset 0x%llx", (unsigned long long) off);
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sb = volume_id_get_buffer(id, off, sizeof(struct ubifs_sb_node));
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if (!sb)
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return -1;
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if (le32_to_cpu(sb->ch.magic) != UBIFS_NODE_MAGIC)
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return -1;
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IF_FEATURE_BLKID_TYPE(id->type = "ubifs";)
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volume_id_set_uuid(id, sb->uuid, UUID_DCE);
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return 0;
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}
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