1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
|
/*
* Copyright (C) International Business Machines Corp., 2000-2003
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _H_JFS_FILSYS
#define _H_JFS_FILSYS
/*
* jfs_filsys.h
*
* file system (implementation-dependent) constants
*
* refer to <limits.h> for system wide implementation-dependent constants
*/
/*
* file system option (superblock flag)
*/
/* directory option */
#define JFS_UNICODE 0x00000001 /* unicode name */
/* mount time flags for error handling */
#define JFS_ERR_REMOUNT_RO 0x00000002 /* remount read-only */
#define JFS_ERR_CONTINUE 0x00000004 /* continue */
#define JFS_ERR_PANIC 0x00000008 /* panic */
/* Quota support */
#define JFS_USRQUOTA 0x00000010
#define JFS_GRPQUOTA 0x00000020
/* mount time flag to disable journaling to disk */
#define JFS_NOINTEGRITY 0x00000040
/* mount time flag to enable TRIM to ssd disks */
#define JFS_DISCARD 0x00000080
/* commit option */
#define JFS_COMMIT 0x00000f00 /* commit option mask */
#define JFS_GROUPCOMMIT 0x00000100 /* group (of 1) commit */
#define JFS_LAZYCOMMIT 0x00000200 /* lazy commit */
#define JFS_TMPFS 0x00000400 /* temporary file system -
* do not log/commit:
* Never implemented
*/
/* log logical volume option */
#define JFS_INLINELOG 0x00000800 /* inline log within file system */
#define JFS_INLINEMOVE 0x00001000 /* inline log being moved */
/* Secondary aggregate inode table */
#define JFS_BAD_SAIT 0x00010000 /* current secondary ait is bad */
/* sparse regular file support */
#define JFS_SPARSE 0x00020000 /* sparse regular file */
/* DASD Limits F226941 */
#define JFS_DASD_ENABLED 0x00040000 /* DASD limits enabled */
#define JFS_DASD_PRIME 0x00080000 /* Prime DASD usage on boot */
/* big endian flag */
#define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */
/* Directory index */
#define JFS_DIR_INDEX 0x00200000 /* Persistent index for */
/* platform options */
#define JFS_LINUX 0x10000000 /* Linux support */
#define JFS_DFS 0x20000000 /* DCE DFS LFS support */
/* Never implemented */
#define JFS_OS2 0x40000000 /* OS/2 support */
/* case-insensitive name/directory support */
#define JFS_AIX 0x80000000 /* AIX support */
/*
* buffer cache configuration
*/
/* page size */
#ifdef PSIZE
#undef PSIZE
#endif
#define PSIZE 4096 /* page size (in byte) */
#define L2PSIZE 12 /* log2(PSIZE) */
#define POFFSET 4095 /* offset within page */
/* buffer page size */
#define BPSIZE PSIZE
/*
* fs fundamental size
*
* PSIZE >= file system block size >= PBSIZE >= DISIZE
*/
#define PBSIZE 512 /* physical block size (in byte) */
#define L2PBSIZE 9 /* log2(PBSIZE) */
#define DISIZE 512 /* on-disk inode size (in byte) */
#define L2DISIZE 9 /* log2(DISIZE) */
#define IDATASIZE 256 /* inode inline data size */
#define IXATTRSIZE 128 /* inode inline extended attribute size */
#define XTPAGE_SIZE 4096
#define log2_PAGESIZE 12
#define IAG_SIZE 4096
#define IAG_EXTENT_SIZE 4096
#define INOSPERIAG 4096 /* number of disk inodes per iag */
#define L2INOSPERIAG 12 /* l2 number of disk inodes per iag */
#define INOSPEREXT 32 /* number of disk inode per extent */
#define L2INOSPEREXT 5 /* l2 number of disk inode per extent */
#define IXSIZE (DISIZE * INOSPEREXT) /* inode extent size */
#define INOSPERPAGE 8 /* number of disk inodes per 4K page */
#define L2INOSPERPAGE 3 /* log2(INOSPERPAGE) */
#define IAGFREELIST_LWM 64
#define INODE_EXTENT_SIZE IXSIZE /* inode extent size */
#define NUM_INODE_PER_EXTENT INOSPEREXT
#define NUM_INODE_PER_IAG INOSPERIAG
#define MINBLOCKSIZE 512
#define MAXBLOCKSIZE 4096
#define MAXFILESIZE ((s64)1 << 52)
#define JFS_LINK_MAX 0xffffffff
/* Minimum number of bytes supported for a JFS partition */
#define MINJFS (0x1000000)
#define MINJFSTEXT "16"
/*
* file system block size -> physical block size
*/
#define LBOFFSET(x) ((x) & (PBSIZE - 1))
#define LBNUMBER(x) ((x) >> L2PBSIZE)
#define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE))
#define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE))
/* size in byte -> last page number */
#define SIZE2PN(size) ( ((s64)((size) - 1)) >> (L2PSIZE) )
/* size in byte -> last file system block number */
#define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
/*
* fixed physical block address (physical block size = 512 byte)
*
* NOTE: since we can't guarantee a physical block size of 512 bytes the use of
* these macros should be removed and the byte offset macros used instead.
*/
#define SUPER1_B 64 /* primary superblock */
#define AIMAP_B (SUPER1_B + 8) /* 1st extent of aggregate inode map */
#define AITBL_B (AIMAP_B + 16) /*
* 1st extent of aggregate inode table
*/
#define SUPER2_B (AITBL_B + 32) /* 2ndary superblock pbn */
#define BMAP_B (SUPER2_B + 8) /* block allocation map */
/*
* SIZE_OF_SUPER defines the total amount of space reserved on disk for the
* superblock. This is not the same as the superblock structure, since all of
* this space is not currently being used.
*/
#define SIZE_OF_SUPER PSIZE
/*
* SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
*/
#define SIZE_OF_AG_TABLE PSIZE
/*
* SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
* the inode allocation map (to hold iag)
*/
#define SIZE_OF_MAP_PAGE PSIZE
/*
* fixed byte offset address
*/
#define SUPER1_OFF 0x8000 /* primary superblock */
#define AIMAP_OFF (SUPER1_OFF + SIZE_OF_SUPER)
/*
* Control page of aggregate inode map
* followed by 1st extent of map
*/
#define AITBL_OFF (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
/*
* 1st extent of aggregate inode table
*/
#define SUPER2_OFF (AITBL_OFF + INODE_EXTENT_SIZE)
/*
* secondary superblock
*/
#define BMAP_OFF (SUPER2_OFF + SIZE_OF_SUPER)
/*
* block allocation map
*/
/*
* The following macro is used to indicate the number of reserved disk blocks at
* the front of an aggregate, in terms of physical blocks. This value is
* currently defined to be 32K. This turns out to be the same as the primary
* superblock's address, since it directly follows the reserved blocks.
*/
#define AGGR_RSVD_BLOCKS SUPER1_B
/*
* The following macro is used to indicate the number of reserved bytes at the
* front of an aggregate. This value is currently defined to be 32K. This
* turns out to be the same as the primary superblock's byte offset, since it
* directly follows the reserved blocks.
*/
#define AGGR_RSVD_BYTES SUPER1_OFF
/*
* The following macro defines the byte offset for the first inode extent in
* the aggregate inode table. This allows us to find the self inode to find the
* rest of the table. Currently this value is 44K.
*/
#define AGGR_INODE_TABLE_START AITBL_OFF
/*
* fixed reserved inode number
*/
/* aggregate inode */
#define AGGR_RESERVED_I 0 /* aggregate inode (reserved) */
#define AGGREGATE_I 1 /* aggregate inode map inode */
#define BMAP_I 2 /* aggregate block allocation map inode */
#define LOG_I 3 /* aggregate inline log inode */
#define BADBLOCK_I 4 /* aggregate bad block inode */
#define FILESYSTEM_I 16 /* 1st/only fileset inode in ait:
* fileset inode map inode
*/
/* per fileset inode */
#define FILESET_RSVD_I 0 /* fileset inode (reserved) */
#define FILESET_EXT_I 1 /* fileset inode extension */
#define ROOT_I 2 /* fileset root inode */
#define ACL_I 3 /* fileset ACL inode */
#define FILESET_OBJECT_I 4 /* the first fileset inode available for a file
* or directory or link...
*/
#define FIRST_FILESET_INO 16 /* the first aggregate inode which describes
* an inode. (To fsck this is also the first
* inode in part 2 of the agg inode table.)
*/
/*
* directory configuration
*/
#define JFS_NAME_MAX 255
#define JFS_PATH_MAX BPSIZE
/*
* file system state (superblock state)
*/
#define FM_CLEAN 0x00000000 /* file system is unmounted and clean */
#define FM_MOUNT 0x00000001 /* file system is mounted cleanly */
#define FM_DIRTY 0x00000002 /* file system was not unmounted and clean
* when mounted or
* commit failure occurred while being mounted:
* fsck() must be run to repair
*/
#define FM_LOGREDO 0x00000004 /* log based recovery (logredo()) failed:
* fsck() must be run to repair
*/
#define FM_EXTENDFS 0x00000008 /* file system extendfs() in progress */
#define FM_STATE_MAX 0x0000000f /* max value of s_state */
#endif /* _H_JFS_FILSYS */
|
