1/* 2 * volume_id - reads filesystem label and uuid 3 * 4 * Copyright (C) Andre Masella <andre@masella.no-ip.org> 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20//config:config FEATURE_VOLUMEID_OCFS2 21//config: bool "ocfs2 filesystem" 22//config: default y 23//config: depends on VOLUMEID 24 25//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_OCFS2) += ocfs2.o 26 27#include "volume_id_internal.h" 28 29/* All these values are taken from ocfs2-tools's ocfs2_fs.h */ 30#define OCFS2_VOL_UUID_LEN 16 31#define OCFS2_MAX_VOL_LABEL_LEN 64 32#define OCFS2_SUPERBLOCK_OFFSET 0x2000 33 34 35/* This is the superblock. The OCFS2 header files have structs in structs. 36This is one has been simplified since we only care about the superblock. 37*/ 38 39struct ocfs2_super_block { 40 uint8_t i_signature[8]; /* Signature for validation */ 41 uint32_t i_generation; /* Generation number */ 42 int16_t i_suballoc_slot; /* Slot suballocator this inode belongs to */ 43 uint16_t i_suballoc_bit; /* Bit offset in suballocator block group */ 44 uint32_t i_reserved0; 45 uint32_t i_clusters; /* Cluster count */ 46 uint32_t i_uid; /* Owner UID */ 47 uint32_t i_gid; /* Owning GID */ 48 uint64_t i_size; /* Size in bytes */ 49 uint16_t i_mode; /* File mode */ 50 uint16_t i_links_count; /* Links count */ 51 uint32_t i_flags; /* File flags */ 52 uint64_t i_atime; /* Access time */ 53 uint64_t i_ctime; /* Creation time */ 54 uint64_t i_mtime; /* Modification time */ 55 uint64_t i_dtime; /* Deletion time */ 56 uint64_t i_blkno; /* Offset on disk, in blocks */ 57 uint64_t i_last_eb_blk; /* Pointer to last extent block */ 58 uint32_t i_fs_generation; /* Generation per fs-instance */ 59 uint32_t i_atime_nsec; 60 uint32_t i_ctime_nsec; 61 uint32_t i_mtime_nsec; 62 uint64_t i_reserved1[9]; 63 uint64_t i_pad1; /* Generic way to refer to this 64bit union */ 64 /* Normally there is a union of the different block types, but we only care about the superblock. */ 65 uint16_t s_major_rev_level; 66 uint16_t s_minor_rev_level; 67 uint16_t s_mnt_count; 68 int16_t s_max_mnt_count; 69 uint16_t s_state; /* File system state */ 70 uint16_t s_errors; /* Behaviour when detecting errors */ 71 uint32_t s_checkinterval; /* Max time between checks */ 72 uint64_t s_lastcheck; /* Time of last check */ 73 uint32_t s_creator_os; /* OS */ 74 uint32_t s_feature_compat; /* Compatible feature set */ 75 uint32_t s_feature_incompat; /* Incompatible feature set */ 76 uint32_t s_feature_ro_compat; /* Readonly-compatible feature set */ 77 uint64_t s_root_blkno; /* Offset, in blocks, of root directory dinode */ 78 uint64_t s_system_dir_blkno; /* Offset, in blocks, of system directory dinode */ 79 uint32_t s_blocksize_bits; /* Blocksize for this fs */ 80 uint32_t s_clustersize_bits; /* Clustersize for this fs */ 81 uint16_t s_max_slots; /* Max number of simultaneous mounts before tunefs required */ 82 uint16_t s_reserved1; 83 uint32_t s_reserved2; 84 uint64_t s_first_cluster_group; /* Block offset of 1st cluster group header */ 85 uint8_t s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ 86 uint8_t s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ 87} PACKED; 88 89int FAST_FUNC volume_id_probe_ocfs2(struct volume_id *id /*,uint64_t off*/) 90{ 91#define off ((uint64_t)0) 92 struct ocfs2_super_block *os; 93 94 dbg("probing at offset 0x%llx", (unsigned long long) off); 95 96 os = volume_id_get_buffer(id, off + OCFS2_SUPERBLOCK_OFFSET, 0x200); 97 if (os == NULL) 98 return -1; 99 100 if (memcmp(os->i_signature, "OCFSV2", 6) != 0) { 101 return -1; 102 } 103 104// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); 105// volume_id_set_label_raw(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? 106// OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); 107 volume_id_set_label_string(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? 108 OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); 109 volume_id_set_uuid(id, os->s_uuid, UUID_DCE); 110 IF_FEATURE_BLKID_TYPE(id->type = "ocfs2";) 111 return 0; 112} 113