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