libblkid-tiny/ubifs.c

   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 };