[2725] | 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 |
|
---|
[3621] | 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 |
|
---|
[2725] | 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.
|
---|
| 41 | This is one has been simplified since we only care about the superblock.
|
---|
| 42 | */
|
---|
| 43 |
|
---|
| 44 | struct 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 |
|
---|
| 94 | int 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);
|
---|
[3232] | 115 | IF_FEATURE_BLKID_TYPE(id->type = "ocfs2";)
|
---|
[2725] | 116 | return 0;
|
---|
| 117 | }
|
---|