/* * 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; }