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Diffstat (limited to 'util-linux/volume_id/ocfs2.c')
| -rw-r--r-- | util-linux/volume_id/ocfs2.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/util-linux/volume_id/ocfs2.c b/util-linux/volume_id/ocfs2.c new file mode 100644 index 0000000..bc490df --- /dev/null +++ b/util-linux/volume_id/ocfs2.c @@ -0,0 +1,105 @@ +/* + * volume_id - reads filesystem label and uuid + * + * Copyright (C) Andre Masella <andre@masella.no-ip.org> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "volume_id_internal.h" + +/* All these values are taken from ocfs2-tools's ocfs2_fs.h */ +#define OCFS2_VOL_UUID_LEN 16 +#define OCFS2_MAX_VOL_LABEL_LEN 64 +#define OCFS2_SUPERBLOCK_OFFSET 0x2000 + + +/* This is the superblock. The OCFS2 header files have structs in structs. +This is one has been simplified since we only care about the superblock. +*/ + +struct ocfs2_super_block { + uint8_t i_signature[8]; /* Signature for validation */ + uint32_t i_generation; /* Generation number */ + int16_t i_suballoc_slot; /* Slot suballocator this inode belongs to */ + uint16_t i_suballoc_bit; /* Bit offset in suballocator block group */ + uint32_t i_reserved0; + uint32_t i_clusters; /* Cluster count */ + uint32_t i_uid; /* Owner UID */ + uint32_t i_gid; /* Owning GID */ + uint64_t i_size; /* Size in bytes */ + uint16_t i_mode; /* File mode */ + uint16_t i_links_count; /* Links count */ + uint32_t i_flags; /* File flags */ + uint64_t i_atime; /* Access time */ + uint64_t i_ctime; /* Creation time */ + uint64_t i_mtime; /* Modification time */ + uint64_t i_dtime; /* Deletion time */ + uint64_t i_blkno; /* Offset on disk, in blocks */ + uint64_t i_last_eb_blk; /* Pointer to last extent block */ + uint32_t i_fs_generation; /* Generation per fs-instance */ + uint32_t i_atime_nsec; + uint32_t i_ctime_nsec; + uint32_t i_mtime_nsec; + uint64_t i_reserved1[9]; + uint64_t i_pad1; /* Generic way to refer to this 64bit union */ + /* Normally there is a union of the different block types, but we only care about the superblock. */ + uint16_t s_major_rev_level; + uint16_t s_minor_rev_level; + uint16_t s_mnt_count; + int16_t s_max_mnt_count; + uint16_t s_state; /* File system state */ + uint16_t s_errors; /* Behaviour when detecting errors */ + uint32_t s_checkinterval; /* Max time between checks */ + uint64_t s_lastcheck; /* Time of last check */ + uint32_t s_creator_os; /* OS */ + uint32_t s_feature_compat; /* Compatible feature set */ + uint32_t s_feature_incompat; /* Incompatible feature set */ + uint32_t s_feature_ro_compat; /* Readonly-compatible feature set */ + uint64_t s_root_blkno; /* Offset, in blocks, of root directory dinode */ + uint64_t s_system_dir_blkno; /* Offset, in blocks, of system directory dinode */ + uint32_t s_blocksize_bits; /* Blocksize for this fs */ + uint32_t s_clustersize_bits; /* Clustersize for this fs */ + uint16_t s_max_slots; /* Max number of simultaneous mounts before tunefs required */ + uint16_t s_reserved1; + uint32_t s_reserved2; + uint64_t s_first_cluster_group; /* Block offset of 1st cluster group header */ + uint8_t s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ + uint8_t s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ +} __attribute__((__packed__)); + +int volume_id_probe_ocfs2(struct volume_id *id, uint64_t off) +{ + struct ocfs2_super_block *os; + + dbg("probing at offset 0x%llx", (unsigned long long) off); + + os = volume_id_get_buffer(id, off + OCFS2_SUPERBLOCK_OFFSET, 0x200); + if (os == NULL) + return -1; + + if (memcmp(os->i_signature, "OCFSV2", 6) != 0) { + return -1; + } + + volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); + volume_id_set_label_raw(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? + OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); + volume_id_set_label_string(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? + OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); + volume_id_set_uuid(id, os->s_uuid, UUID_DCE); + id->type = "ocfs2"; + return 0; +} |