add a tiny version of libblkid

[project/ubox.git] / libblkid-tiny / ubifs.c

diff --git a/libblkid-tiny/ubifs.c b/libblkid-tiny/ubifs.c
new file mode 100644 (file)
index 0000000..2d69c2b
--- /dev/null
+++ b/libblkid-tiny/ubifs.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2009 Corentin Chary <corentincj@iksaif.net>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "superblocks.h"
+
+/*
+ * 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];
+} __attribute__ ((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];
+} __attribute__ ((packed));
+
+static int probe_ubifs(blkid_probe pr, const struct blkid_idmag *mag)
+{
+       struct ubifs_sb_node *sb;
+
+       sb = blkid_probe_get_sb(pr, mag, struct ubifs_sb_node);
+       if (!sb)
+               return -1;
+
+       blkid_probe_set_uuid(pr, sb->uuid);
+       blkid_probe_sprintf_version(pr, "w%dr%d",
+                                   sb->fmt_version, sb->ro_compat_version);
+       return 0;
+}
+
+const struct blkid_idinfo ubifs_idinfo =
+{
+       .name           = "ubifs",
+       .usage          = BLKID_USAGE_FILESYSTEM,
+       .probefunc      = probe_ubifs,
+       .magics         =
+       {
+               { .magic = "\x31\x18\x10\x06", .len = 4 },
+               { NULL }
+       }
+};