From e60683a0d553b6488c564863f4e48954944fb0f8 Mon Sep 17 00:00:00 2001 From: bigbiff bigbiff Date: Fri, 22 Feb 2013 20:55:50 -0500 Subject: use libblkid to get filesystem type we can now use libblkid to detect exfat --- libblkid/nilfs.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 120 insertions(+) create mode 100644 libblkid/nilfs.c (limited to 'libblkid/nilfs.c') diff --git a/libblkid/nilfs.c b/libblkid/nilfs.c new file mode 100644 index 000000000..1f8f3a69f --- /dev/null +++ b/libblkid/nilfs.c @@ -0,0 +1,120 @@ +/* + * Copyright (C) 2010 by Jiro SEKIBA + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License + */ +#include +#include + +#include "superblocks.h" +#include "crc32.h" + +struct nilfs_super_block { + uint32_t s_rev_level; + uint16_t s_minor_rev_level; + uint16_t s_magic; + + uint16_t s_bytes; + + uint16_t s_flags; + uint32_t s_crc_seed; + uint32_t s_sum; + + uint32_t s_log_block_size; + + uint64_t s_nsegments; + uint64_t s_dev_size; + uint64_t s_first_data_block; + uint32_t s_blocks_per_segment; + uint32_t s_r_segments_percentage; + + uint64_t s_last_cno; + uint64_t s_last_pseg; + uint64_t s_last_seq; + uint64_t s_free_blocks_count; + + uint64_t s_ctime; + + uint64_t s_mtime; + uint64_t s_wtime; + uint16_t s_mnt_count; + uint16_t s_max_mnt_count; + uint16_t s_state; + uint16_t s_errors; + uint64_t s_lastcheck; + + uint32_t s_checkinterval; + uint32_t s_creator_os; + uint16_t s_def_resuid; + uint16_t s_def_resgid; + uint32_t s_first_ino; + + uint16_t s_inode_size; + uint16_t s_dat_entry_size; + uint16_t s_checkpoint_size; + uint16_t s_segment_usage_size; + + uint8_t s_uuid[16]; + char s_volume_name[80]; + + uint32_t s_c_interval; + uint32_t s_c_block_max; + uint32_t s_reserved[192]; +}; + +/* nilfs2 magic string */ +#define NILFS_SB_MAGIC "\x34\x34" +/* nilfs2 super block offset */ +#define NILFS_SB_OFF 0x400 +/* nilfs2 super block offset in kB */ +#define NILFS_SB_KBOFF (NILFS_SB_OFF >> 10) +/* nilfs2 magic string offset within super block */ +#define NILFS_MAG_OFF 6 + +static int probe_nilfs2(blkid_probe pr, const struct blkid_idmag *mag) +{ + struct nilfs_super_block *sb; + static unsigned char sum[4]; + const int sumoff = offsetof(struct nilfs_super_block, s_sum); + size_t bytes; + uint32_t crc; + + sb = blkid_probe_get_sb(pr, mag, struct nilfs_super_block); + if (!sb) + return -1; + + bytes = le16_to_cpu(sb->s_bytes); + crc = crc32(le32_to_cpu(sb->s_crc_seed), (unsigned char *)sb, sumoff); + crc = crc32(crc, sum, 4); + crc = crc32(crc, (unsigned char *)sb + sumoff + 4, bytes - sumoff - 4); + + if (crc != le32_to_cpu(sb->s_sum)) + return -1; + + if (strlen(sb->s_volume_name)) + blkid_probe_set_label(pr, (unsigned char *) sb->s_volume_name, + sizeof(sb->s_volume_name)); + + blkid_probe_set_uuid(pr, sb->s_uuid); + blkid_probe_sprintf_version(pr, "%u", le32_to_cpu(sb->s_rev_level)); + + return 0; +} + +const struct blkid_idinfo nilfs2_idinfo = +{ + .name = "nilfs2", + .usage = BLKID_USAGE_FILESYSTEM, + .probefunc = probe_nilfs2, + .magics = + { + { + .magic = NILFS_SB_MAGIC, + .len = 2, + .kboff = NILFS_SB_KBOFF, + .sboff = NILFS_MAG_OFF + }, + { NULL } + } +}; -- cgit v1.2.3