diff options
Diffstat (limited to 'util-linux/volume_id/ubifs.c')
| -rw-r--r-- | util-linux/volume_id/ubifs.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/util-linux/volume_id/ubifs.c b/util-linux/volume_id/ubifs.c new file mode 100644 index 0000000..13604ec --- /dev/null +++ b/util-linux/volume_id/ubifs.c @@ -0,0 +1,125 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) 2012 S-G Bergh <sgb@systemasis.org> + * + * Licensed under GPLv2, see file LICENSE in this source tree. + */ + +//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_UBIFS) += ubifs.o + +//config: +//config:config FEATURE_VOLUMEID_UBIFS +//config: bool "UBIFS filesystem" +//config: default y +//config: depends on VOLUMEID +//config: help +//config: UBIFS (Unsorted Block Image File System) is a file +//config: system for use with raw flash memory media. +//config: + +#include "volume_id_internal.h" + +#define UBIFS_NODE_MAGIC 0x06101831 + +/* + * struct ubifs_ch - common header node. + * @magic: UBIFS node magic number (%UBIFS_NODE_MAGIC) + * @crc: CRC-32 checksum of the node header + * @sqnum: sequence number + * @len: full node length + * @node_type: node type + * @group_type: node group type + * @padding: reserved for future, zeroes + * + * Every UBIFS node starts with this common part. If the node has a key, the + * key always goes next. + */ +struct ubifs_ch { + uint32_t magic; + uint32_t crc; + uint64_t sqnum; + uint32_t len; + uint8_t node_type; + uint8_t group_type; + uint8_t padding[2]; +} PACKED; + +/* + * struct ubifs_sb_node - superblock node. + * @ch: common header + * @padding: reserved for future, zeroes + * @key_hash: type of hash function used in keys + * @key_fmt: format of the key + * @flags: file-system flags (%UBIFS_FLG_BIGLPT, etc) + * @min_io_size: minimal input/output unit size + * @leb_size: logical eraseblock size in bytes + * @leb_cnt: count of LEBs used by file-system + * @max_leb_cnt: maximum count of LEBs used by file-system + * @max_bud_bytes: maximum amount of data stored in buds + * @log_lebs: log size in logical eraseblocks + * @lpt_lebs: number of LEBs used for lprops table + * @orph_lebs: number of LEBs used for recording orphans + * @jhead_cnt: count of journal heads + * @fanout: tree fanout (max. number of links per indexing node) + * @lsave_cnt: number of LEB numbers in LPT's save table + * @fmt_version: UBIFS on-flash format version + * @default_compr: default compression algorithm (%UBIFS_COMPR_LZO, etc) + * @padding1: reserved for future, zeroes + * @rp_uid: reserve pool UID + * @rp_gid: reserve pool GID + * @rp_size: size of the reserved pool in bytes + * @padding2: reserved for future, zeroes + * @time_gran: time granularity in nanoseconds + * @uuid: UUID generated when the file system image was created + * @ro_compat_version: UBIFS R/O compatibility version + */ +struct ubifs_sb_node { + struct ubifs_ch ch; + uint8_t padding[2]; + uint8_t key_hash; + uint8_t key_fmt; + uint32_t flags; + uint32_t min_io_size; + uint32_t leb_size; + uint32_t leb_cnt; + uint32_t max_leb_cnt; + uint64_t max_bud_bytes; + uint32_t log_lebs; + uint32_t lpt_lebs; + uint32_t orph_lebs; + uint32_t jhead_cnt; + uint32_t fanout; + uint32_t lsave_cnt; + uint32_t fmt_version; + uint16_t default_compr; + uint8_t padding1[2]; + uint32_t rp_uid; + uint32_t rp_gid; + uint64_t rp_size; + uint32_t time_gran; + uint8_t uuid[16]; + uint32_t ro_compat_version; +/* + uint8_t padding2[3968]; +*/ +} PACKED; + +int FAST_FUNC volume_id_probe_ubifs(struct volume_id *id /*,uint64_t off*/) +{ +#define off ((uint64_t)0) + struct ubifs_sb_node *sb; + + dbg("UBIFS: probing at offset 0x%llx", (unsigned long long) off); + sb = volume_id_get_buffer(id, off, sizeof(struct ubifs_sb_node)); + if (!sb) + return -1; + + if (le32_to_cpu(sb->ch.magic) != UBIFS_NODE_MAGIC) + return -1; + + IF_FEATURE_BLKID_TYPE(id->type = "ubifs";) + volume_id_set_uuid(id, sb->uuid, UUID_DCE); + + return 0; +} |