Contents of /trunk/mkinitrd-magellan/busybox/util-linux/volume_id/ocfs2.c
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Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
File MIME type: text/plain
File size: 4394 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
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 | #include "volume_id_internal.h" |
22 | |
23 | /* All these values are taken from ocfs2-tools's ocfs2_fs.h */ |
24 | #define OCFS2_VOL_UUID_LEN 16 |
25 | #define OCFS2_MAX_VOL_LABEL_LEN 64 |
26 | #define OCFS2_SUPERBLOCK_OFFSET 0x2000 |
27 | |
28 | |
29 | /* This is the superblock. The OCFS2 header files have structs in structs. |
30 | This is one has been simplified since we only care about the superblock. |
31 | */ |
32 | |
33 | struct ocfs2_super_block { |
34 | uint8_t i_signature[8]; /* Signature for validation */ |
35 | uint32_t i_generation; /* Generation number */ |
36 | int16_t i_suballoc_slot; /* Slot suballocator this inode belongs to */ |
37 | uint16_t i_suballoc_bit; /* Bit offset in suballocator block group */ |
38 | uint32_t i_reserved0; |
39 | uint32_t i_clusters; /* Cluster count */ |
40 | uint32_t i_uid; /* Owner UID */ |
41 | uint32_t i_gid; /* Owning GID */ |
42 | uint64_t i_size; /* Size in bytes */ |
43 | uint16_t i_mode; /* File mode */ |
44 | uint16_t i_links_count; /* Links count */ |
45 | uint32_t i_flags; /* File flags */ |
46 | uint64_t i_atime; /* Access time */ |
47 | uint64_t i_ctime; /* Creation time */ |
48 | uint64_t i_mtime; /* Modification time */ |
49 | uint64_t i_dtime; /* Deletion time */ |
50 | uint64_t i_blkno; /* Offset on disk, in blocks */ |
51 | uint64_t i_last_eb_blk; /* Pointer to last extent block */ |
52 | uint32_t i_fs_generation; /* Generation per fs-instance */ |
53 | uint32_t i_atime_nsec; |
54 | uint32_t i_ctime_nsec; |
55 | uint32_t i_mtime_nsec; |
56 | uint64_t i_reserved1[9]; |
57 | uint64_t i_pad1; /* Generic way to refer to this 64bit union */ |
58 | /* Normally there is a union of the different block types, but we only care about the superblock. */ |
59 | uint16_t s_major_rev_level; |
60 | uint16_t s_minor_rev_level; |
61 | uint16_t s_mnt_count; |
62 | int16_t s_max_mnt_count; |
63 | uint16_t s_state; /* File system state */ |
64 | uint16_t s_errors; /* Behaviour when detecting errors */ |
65 | uint32_t s_checkinterval; /* Max time between checks */ |
66 | uint64_t s_lastcheck; /* Time of last check */ |
67 | uint32_t s_creator_os; /* OS */ |
68 | uint32_t s_feature_compat; /* Compatible feature set */ |
69 | uint32_t s_feature_incompat; /* Incompatible feature set */ |
70 | uint32_t s_feature_ro_compat; /* Readonly-compatible feature set */ |
71 | uint64_t s_root_blkno; /* Offset, in blocks, of root directory dinode */ |
72 | uint64_t s_system_dir_blkno; /* Offset, in blocks, of system directory dinode */ |
73 | uint32_t s_blocksize_bits; /* Blocksize for this fs */ |
74 | uint32_t s_clustersize_bits; /* Clustersize for this fs */ |
75 | uint16_t s_max_slots; /* Max number of simultaneous mounts before tunefs required */ |
76 | uint16_t s_reserved1; |
77 | uint32_t s_reserved2; |
78 | uint64_t s_first_cluster_group; /* Block offset of 1st cluster group header */ |
79 | uint8_t s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */ |
80 | uint8_t s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */ |
81 | } PACKED; |
82 | |
83 | int FAST_FUNC volume_id_probe_ocfs2(struct volume_id *id /*,uint64_t off*/) |
84 | { |
85 | #define off ((uint64_t)0) |
86 | struct ocfs2_super_block *os; |
87 | |
88 | dbg("probing at offset 0x%llx", (unsigned long long) off); |
89 | |
90 | os = volume_id_get_buffer(id, off + OCFS2_SUPERBLOCK_OFFSET, 0x200); |
91 | if (os == NULL) |
92 | return -1; |
93 | |
94 | if (memcmp(os->i_signature, "OCFSV2", 6) != 0) { |
95 | return -1; |
96 | } |
97 | |
98 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); |
99 | // volume_id_set_label_raw(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? |
100 | // OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); |
101 | volume_id_set_label_string(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? |
102 | OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); |
103 | volume_id_set_uuid(id, os->s_uuid, UUID_DCE); |
104 | // id->type = "ocfs2"; |
105 | return 0; |
106 | } |