Annotation of /trunk/mkinitrd-magellan/busybox/util-linux/volume_id/ocfs2.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
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Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 4375 byte(s)
-updated to busybox-1.13.4
1 | niro | 816 | /* |
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 | } __attribute__((__packed__)); | ||
82 | |||
83 | int volume_id_probe_ocfs2(struct volume_id *id, uint64_t off) | ||
84 | { | ||
85 | struct ocfs2_super_block *os; | ||
86 | |||
87 | dbg("probing at offset 0x%llx", (unsigned long long) off); | ||
88 | |||
89 | os = volume_id_get_buffer(id, off + OCFS2_SUPERBLOCK_OFFSET, 0x200); | ||
90 | if (os == NULL) | ||
91 | return -1; | ||
92 | |||
93 | if (memcmp(os->i_signature, "OCFSV2", 6) != 0) { | ||
94 | return -1; | ||
95 | } | ||
96 | |||
97 | // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); | ||
98 | // volume_id_set_label_raw(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? | ||
99 | // OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); | ||
100 | volume_id_set_label_string(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ? | ||
101 | OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE); | ||
102 | volume_id_set_uuid(id, os->s_uuid, UUID_DCE); | ||
103 | // id->type = "ocfs2"; | ||
104 | return 0; | ||
105 | } |