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 21//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_OCFS2) += ocfs2.o 22 23//config: 24//config:config FEATURE_VOLUMEID_OCFS2 25//config: bool "ocfs2 filesystem" 26//config: default y 27//config: depends on VOLUMEID 28//config: help 29//config: TODO 30//config: 31 32#include "volume_id_internal.h" 33 34/* All these values are taken from ocfs2-tools's ocfs2_fs.h */ 35#define OCFS2_VOL_UUID_LEN 16 36#define OCFS2_MAX_VOL_LABEL_LEN 64 37#define OCFS2_SUPERBLOCK_OFFSET 0x2000 38 39 40/* This is the superblock. The OCFS2 header files have structs in structs. 41This is one has been simplified since we only care about the superblock. 42*/ 43 44struct ocfs2_super_block { 45 uint8_t i_signature[8]; /* Signature for validation */ 46 uint32_t i_generation; /* Generation number */ 47 int16_t i_suballoc_slot; /* Slot suballocator this inode belongs to */ 48 uint16_t i_suballoc_bit; /* Bit offset in suballocator block group */ 49 uint32_t i_reserved0; 50 uint32_t i_clusters; /* Cluster count */ 51 uint32_t i_uid; /* Owner UID */ 52 uint32_t i_gid; /* Owning GID */ 53 uint64_t i_size; /* Size in bytes */ 54 uint16_t i_mode; /* File mode */ 55 uint16_t i_links_count; /* Links count */ 56 uint32_t i_flags; /* File flags */ 57 uint64_t i_atime; /* Access time */ 58 uint64_t i_ctime; /* Creation time */ 59 uint64_t i_mtime; /* Modification time */ 60 uint64_t i_dtime; /* Deletion time */ 61 uint64_t i_blkno; /* Offset on disk, in blocks */ 62 uint64_t i_last_eb_blk; /* Pointer to last extent block */ 63 uint32_t i_fs_generation; /* Generation per fs-instance */ 64 uint32_t i_atime_nsec; 65 uint32_t i_ctime_nsec; 66 uint32_t i_mtime_nsec; 67 uint64_t i_reserved1[9]; 68 uint64_t i_pad1; /* Generic way to refer to this 64bit union */ 69 /* Normally there is a union of the different block types, but we only care about the superblock. */ 70 uint16_t s_major_rev_level; 71 uint16_t s_minor_rev_level; 72 uint16_t s_mnt_count; 73 int16_t s_max_mnt_count; 74 uint16_t s_state; /* File system state */ 75 uint16_t s_errors; /* Behaviour when detecting errors */ 76 uint32_t s_checkinterval; /* Max time between checks */ 77 uint64_t s_lastcheck; /* Time of last check */ 78 uint32_t s_creator_os; /* OS */ 79 uint32_t s_feature_compat; /* Compatible feature set */ 80 uint32_t s_feature_incompat; /* Incompatible feature set */ 81 uint32_t s_feature_ro_compat; /* Readonly-compatible feature set */ 82 uint64_t s_root_blkno; /* Offset, in blocks, of root directory dinode */ 83 uint64_t s_system_dir_blkno; /* Offset, in blocks, of system directory dinode */ 84 uint32_t s_blocksize_bits; /* Blocksize for this fs */ 85 uint32_t s_clustersize_bits; /* Clustersize for this fs */ 86 uint16_t s_max_slots; /* Max number of simultaneous mounts before tunefs required */ 87 uint16_t s_reserved1; 88 uint32_t s_reserved2; 89 uint64_t s_first_cluster_group; /* Block offset of 1st cluster group header */ 90 uint8_t s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ 91 uint8_t s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ 92} PACKED; 93 94int FAST_FUNC volume_id_probe_ocfs2(struct volume_id *id /*,uint64_t off*/) 95{ 96#define off ((uint64_t)0) 97 struct ocfs2_super_block *os; 98 99 dbg("probing at offset 0x%llx", (unsigned long long) off); 100 101 os = volume_id_get_buffer(id, off + OCFS2_SUPERBLOCK_OFFSET, 0x200); 102 if (os == NULL) 103 return -1; 104 105 if (memcmp(os->i_signature, "OCFSV2", 6) != 0) { 106 return -1; 107 } 108 109// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); 110// volume_id_set_label_raw(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? 111// OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); 112 volume_id_set_label_string(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? 113 OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); 114 volume_id_set_uuid(id, os->s_uuid, UUID_DCE); 115 IF_FEATURE_BLKID_TYPE(id->type = "ocfs2";) 116 return 0; 117} 118