Contents of /trunk/mkinitrd-magellan/busybox/e2fsprogs/old_e2fsprogs/ext2fs/kernel-jbd.h
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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: 6394 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * linux/include/linux/jbd.h |
4 | * |
5 | * Written by Stephen C. Tweedie <sct@redhat.com> |
6 | * |
7 | * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved |
8 | * |
9 | * This file is part of the Linux kernel and is made available under |
10 | * the terms of the GNU General Public License, version 2, or at your |
11 | * option, any later version, incorporated herein by reference. |
12 | * |
13 | * Definitions for transaction data structures for the buffer cache |
14 | * filesystem journaling support. |
15 | */ |
16 | #ifndef LINUX_JBD_H |
17 | #define LINUX_JBD_H 1 |
18 | |
19 | #include <sys/types.h> |
20 | #include <linux/types.h> |
21 | #include "ext2fs.h" |
22 | |
23 | /* |
24 | * Standard header for all descriptor blocks: |
25 | */ |
26 | |
27 | typedef struct journal_header_s |
28 | { |
29 | __u32 h_magic; |
30 | __u32 h_blocktype; |
31 | __u32 h_sequence; |
32 | } journal_header_t; |
33 | |
34 | /* |
35 | * This is the global e2fsck structure. |
36 | */ |
37 | typedef struct e2fsck_struct *e2fsck_t; |
38 | |
39 | |
40 | struct inode { |
41 | e2fsck_t i_ctx; |
42 | ext2_ino_t i_ino; |
43 | struct ext2_inode i_ext2; |
44 | }; |
45 | |
46 | |
47 | /* |
48 | * The journal superblock. All fields are in big-endian byte order. |
49 | */ |
50 | typedef struct journal_superblock_s |
51 | { |
52 | /* 0x0000 */ |
53 | journal_header_t s_header; |
54 | |
55 | /* 0x000C */ |
56 | /* Static information describing the journal */ |
57 | __u32 s_blocksize; /* journal device blocksize */ |
58 | __u32 s_maxlen; /* total blocks in journal file */ |
59 | __u32 s_first; /* first block of log information */ |
60 | |
61 | /* 0x0018 */ |
62 | /* Dynamic information describing the current state of the log */ |
63 | __u32 s_sequence; /* first commit ID expected in log */ |
64 | __u32 s_start; /* blocknr of start of log */ |
65 | |
66 | /* 0x0020 */ |
67 | /* Error value, as set by journal_abort(). */ |
68 | __s32 s_errno; |
69 | |
70 | /* 0x0024 */ |
71 | /* Remaining fields are only valid in a version-2 superblock */ |
72 | __u32 s_feature_compat; /* compatible feature set */ |
73 | __u32 s_feature_incompat; /* incompatible feature set */ |
74 | __u32 s_feature_ro_compat; /* readonly-compatible feature set */ |
75 | /* 0x0030 */ |
76 | __u8 s_uuid[16]; /* 128-bit uuid for journal */ |
77 | |
78 | /* 0x0040 */ |
79 | __u32 s_nr_users; /* Nr of filesystems sharing log */ |
80 | |
81 | __u32 s_dynsuper; /* Blocknr of dynamic superblock copy*/ |
82 | |
83 | /* 0x0048 */ |
84 | __u32 s_max_transaction; /* Limit of journal blocks per trans.*/ |
85 | __u32 s_max_trans_data; /* Limit of data blocks per trans. */ |
86 | |
87 | /* 0x0050 */ |
88 | __u32 s_padding[44]; |
89 | |
90 | /* 0x0100 */ |
91 | __u8 s_users[16*48]; /* ids of all fs'es sharing the log */ |
92 | /* 0x0400 */ |
93 | } journal_superblock_t; |
94 | |
95 | |
96 | extern int journal_blocks_per_page(struct inode *inode); |
97 | extern int jbd_blocks_per_page(struct inode *inode); |
98 | |
99 | #define JFS_MIN_JOURNAL_BLOCKS 1024 |
100 | |
101 | |
102 | /* |
103 | * Internal structures used by the logging mechanism: |
104 | */ |
105 | |
106 | #define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */ |
107 | |
108 | /* |
109 | * Descriptor block types: |
110 | */ |
111 | |
112 | #define JFS_DESCRIPTOR_BLOCK 1 |
113 | #define JFS_COMMIT_BLOCK 2 |
114 | #define JFS_SUPERBLOCK_V1 3 |
115 | #define JFS_SUPERBLOCK_V2 4 |
116 | #define JFS_REVOKE_BLOCK 5 |
117 | |
118 | /* |
119 | * The block tag: used to describe a single buffer in the journal |
120 | */ |
121 | typedef struct journal_block_tag_s |
122 | { |
123 | __u32 t_blocknr; /* The on-disk block number */ |
124 | __u32 t_flags; /* See below */ |
125 | } journal_block_tag_t; |
126 | |
127 | /* |
128 | * The revoke descriptor: used on disk to describe a series of blocks to |
129 | * be revoked from the log |
130 | */ |
131 | typedef struct journal_revoke_header_s |
132 | { |
133 | journal_header_t r_header; |
134 | int r_count; /* Count of bytes used in the block */ |
135 | } journal_revoke_header_t; |
136 | |
137 | |
138 | /* Definitions for the journal tag flags word: */ |
139 | #define JFS_FLAG_ESCAPE 1 /* on-disk block is escaped */ |
140 | #define JFS_FLAG_SAME_UUID 2 /* block has same uuid as previous */ |
141 | #define JFS_FLAG_DELETED 4 /* block deleted by this transaction */ |
142 | #define JFS_FLAG_LAST_TAG 8 /* last tag in this descriptor block */ |
143 | |
144 | |
145 | |
146 | |
147 | #define JFS_HAS_COMPAT_FEATURE(j,mask) \ |
148 | ((j)->j_format_version >= 2 && \ |
149 | ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask)))) |
150 | #define JFS_HAS_RO_COMPAT_FEATURE(j,mask) \ |
151 | ((j)->j_format_version >= 2 && \ |
152 | ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask)))) |
153 | #define JFS_HAS_INCOMPAT_FEATURE(j,mask) \ |
154 | ((j)->j_format_version >= 2 && \ |
155 | ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask)))) |
156 | |
157 | #define JFS_FEATURE_INCOMPAT_REVOKE 0x00000001 |
158 | |
159 | /* Features known to this kernel version: */ |
160 | #define JFS_KNOWN_COMPAT_FEATURES 0 |
161 | #define JFS_KNOWN_ROCOMPAT_FEATURES 0 |
162 | #define JFS_KNOWN_INCOMPAT_FEATURES JFS_FEATURE_INCOMPAT_REVOKE |
163 | |
164 | /* Comparison functions for transaction IDs: perform comparisons using |
165 | * modulo arithmetic so that they work over sequence number wraps. */ |
166 | |
167 | |
168 | /* |
169 | * Definitions which augment the buffer_head layer |
170 | */ |
171 | |
172 | /* journaling buffer types */ |
173 | #define BJ_None 0 /* Not journaled */ |
174 | #define BJ_SyncData 1 /* Normal data: flush before commit */ |
175 | #define BJ_AsyncData 2 /* writepage data: wait on it before commit */ |
176 | #define BJ_Metadata 3 /* Normal journaled metadata */ |
177 | #define BJ_Forget 4 /* Buffer superceded by this transaction */ |
178 | #define BJ_IO 5 /* Buffer is for temporary IO use */ |
179 | #define BJ_Shadow 6 /* Buffer contents being shadowed to the log */ |
180 | #define BJ_LogCtl 7 /* Buffer contains log descriptors */ |
181 | #define BJ_Reserved 8 /* Buffer is reserved for access by journal */ |
182 | #define BJ_Types 9 |
183 | |
184 | |
185 | struct kdev_s { |
186 | e2fsck_t k_ctx; |
187 | int k_dev; |
188 | }; |
189 | |
190 | typedef struct kdev_s *kdev_t; |
191 | typedef unsigned int tid_t; |
192 | |
193 | struct journal_s |
194 | { |
195 | unsigned long j_flags; |
196 | int j_errno; |
197 | struct buffer_head * j_sb_buffer; |
198 | struct journal_superblock_s *j_superblock; |
199 | int j_format_version; |
200 | unsigned long j_head; |
201 | unsigned long j_tail; |
202 | unsigned long j_free; |
203 | unsigned long j_first, j_last; |
204 | kdev_t j_dev; |
205 | kdev_t j_fs_dev; |
206 | int j_blocksize; |
207 | unsigned int j_blk_offset; |
208 | unsigned int j_maxlen; |
209 | struct inode * j_inode; |
210 | tid_t j_tail_sequence; |
211 | tid_t j_transaction_sequence; |
212 | __u8 j_uuid[16]; |
213 | struct jbd_revoke_table_s *j_revoke; |
214 | }; |
215 | |
216 | typedef struct journal_s journal_t; |
217 | |
218 | extern int journal_recover (journal_t *journal); |
219 | extern int journal_skip_recovery (journal_t *); |
220 | |
221 | /* Primary revoke support */ |
222 | extern int journal_init_revoke(journal_t *, int); |
223 | extern void journal_destroy_revoke_caches(void); |
224 | extern int journal_init_revoke_caches(void); |
225 | |
226 | /* Recovery revoke support */ |
227 | extern int journal_set_revoke(journal_t *, unsigned long, tid_t); |
228 | extern int journal_test_revoke(journal_t *, unsigned long, tid_t); |
229 | extern void journal_clear_revoke(journal_t *); |
230 | extern void journal_brelse_array(struct buffer_head *b[], int n); |
231 | |
232 | extern void journal_destroy_revoke(journal_t *); |
233 | |
234 | |
235 | #endif |