1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* |
3 | * Copyright (C) International Business Machines Corp., 2000-2003 |
4 | */ |
5 | #ifndef _H_JFS_FILSYS |
6 | #define _H_JFS_FILSYS |
7 | |
8 | /* |
9 | * jfs_filsys.h |
10 | * |
11 | * file system (implementation-dependent) constants |
12 | * |
13 | * refer to <limits.h> for system wide implementation-dependent constants |
14 | */ |
15 | |
16 | /* |
17 | * file system option (superblock flag) |
18 | */ |
19 | |
20 | /* directory option */ |
21 | #define JFS_UNICODE 0x00000001 /* unicode name */ |
22 | |
23 | /* mount time flags for error handling */ |
24 | #define JFS_ERR_REMOUNT_RO 0x00000002 /* remount read-only */ |
25 | #define JFS_ERR_CONTINUE 0x00000004 /* continue */ |
26 | #define JFS_ERR_PANIC 0x00000008 /* panic */ |
27 | |
28 | /* Quota support */ |
29 | #define JFS_USRQUOTA 0x00000010 |
30 | #define JFS_GRPQUOTA 0x00000020 |
31 | |
32 | /* mount time flag to disable journaling to disk */ |
33 | #define JFS_NOINTEGRITY 0x00000040 |
34 | |
35 | /* mount time flag to enable TRIM to ssd disks */ |
36 | #define JFS_DISCARD 0x00000080 |
37 | |
38 | /* commit option */ |
39 | #define JFS_COMMIT 0x00000f00 /* commit option mask */ |
40 | #define JFS_GROUPCOMMIT 0x00000100 /* group (of 1) commit */ |
41 | #define JFS_LAZYCOMMIT 0x00000200 /* lazy commit */ |
42 | #define JFS_TMPFS 0x00000400 /* temporary file system - |
43 | * do not log/commit: |
44 | * Never implemented |
45 | */ |
46 | |
47 | /* log logical volume option */ |
48 | #define JFS_INLINELOG 0x00000800 /* inline log within file system */ |
49 | #define JFS_INLINEMOVE 0x00001000 /* inline log being moved */ |
50 | |
51 | /* Secondary aggregate inode table */ |
52 | #define JFS_BAD_SAIT 0x00010000 /* current secondary ait is bad */ |
53 | |
54 | /* sparse regular file support */ |
55 | #define JFS_SPARSE 0x00020000 /* sparse regular file */ |
56 | |
57 | /* DASD Limits F226941 */ |
58 | #define JFS_DASD_ENABLED 0x00040000 /* DASD limits enabled */ |
59 | #define JFS_DASD_PRIME 0x00080000 /* Prime DASD usage on boot */ |
60 | |
61 | /* big endian flag */ |
62 | #define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */ |
63 | |
64 | /* Directory index */ |
65 | #define JFS_DIR_INDEX 0x00200000 /* Persistent index for */ |
66 | |
67 | /* platform options */ |
68 | #define JFS_LINUX 0x10000000 /* Linux support */ |
69 | #define JFS_DFS 0x20000000 /* DCE DFS LFS support */ |
70 | /* Never implemented */ |
71 | |
72 | #define JFS_OS2 0x40000000 /* OS/2 support */ |
73 | /* case-insensitive name/directory support */ |
74 | |
75 | #define JFS_AIX 0x80000000 /* AIX support */ |
76 | |
77 | /* |
78 | * buffer cache configuration |
79 | */ |
80 | /* page size */ |
81 | #ifdef PSIZE |
82 | #undef PSIZE |
83 | #endif |
84 | #define PSIZE 4096 /* page size (in byte) */ |
85 | #define L2PSIZE 12 /* log2(PSIZE) */ |
86 | #define POFFSET 4095 /* offset within page */ |
87 | |
88 | /* buffer page size */ |
89 | #define BPSIZE PSIZE |
90 | |
91 | /* |
92 | * fs fundamental size |
93 | * |
94 | * PSIZE >= file system block size >= PBSIZE >= DISIZE |
95 | */ |
96 | #define PBSIZE 512 /* physical block size (in byte) */ |
97 | #define L2PBSIZE 9 /* log2(PBSIZE) */ |
98 | |
99 | #define DISIZE 512 /* on-disk inode size (in byte) */ |
100 | #define L2DISIZE 9 /* log2(DISIZE) */ |
101 | |
102 | #define IDATASIZE 256 /* inode inline data size */ |
103 | #define IXATTRSIZE 128 /* inode inline extended attribute size */ |
104 | |
105 | #define XTPAGE_SIZE 4096 |
106 | #define log2_PAGESIZE 12 |
107 | |
108 | #define IAG_SIZE 4096 |
109 | #define IAG_EXTENT_SIZE 4096 |
110 | #define INOSPERIAG 4096 /* number of disk inodes per iag */ |
111 | #define L2INOSPERIAG 12 /* l2 number of disk inodes per iag */ |
112 | #define INOSPEREXT 32 /* number of disk inode per extent */ |
113 | #define L2INOSPEREXT 5 /* l2 number of disk inode per extent */ |
114 | #define IXSIZE (DISIZE * INOSPEREXT) /* inode extent size */ |
115 | #define INOSPERPAGE 8 /* number of disk inodes per 4K page */ |
116 | #define L2INOSPERPAGE 3 /* log2(INOSPERPAGE) */ |
117 | |
118 | #define IAGFREELIST_LWM 64 |
119 | |
120 | #define INODE_EXTENT_SIZE IXSIZE /* inode extent size */ |
121 | #define NUM_INODE_PER_EXTENT INOSPEREXT |
122 | #define NUM_INODE_PER_IAG INOSPERIAG |
123 | |
124 | #define MINBLOCKSIZE 512 |
125 | #define L2MINBLOCKSIZE 9 |
126 | #define MAXBLOCKSIZE 4096 |
127 | #define L2MAXBLOCKSIZE 12 |
128 | #define MAXFILESIZE ((s64)1 << 52) |
129 | |
130 | #define JFS_LINK_MAX 0xffffffff |
131 | |
132 | /* Minimum number of bytes supported for a JFS partition */ |
133 | #define MINJFS (0x1000000) |
134 | #define MINJFSTEXT "16" |
135 | |
136 | /* |
137 | * file system block size -> physical block size |
138 | */ |
139 | #define LBOFFSET(x) ((x) & (PBSIZE - 1)) |
140 | #define LBNUMBER(x) ((x) >> L2PBSIZE) |
141 | #define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE)) |
142 | #define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE)) |
143 | /* size in byte -> last page number */ |
144 | #define SIZE2PN(size) ( ((s64)((size) - 1)) >> (L2PSIZE) ) |
145 | /* size in byte -> last file system block number */ |
146 | #define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) ) |
147 | |
148 | /* |
149 | * fixed physical block address (physical block size = 512 byte) |
150 | * |
151 | * NOTE: since we can't guarantee a physical block size of 512 bytes the use of |
152 | * these macros should be removed and the byte offset macros used instead. |
153 | */ |
154 | #define SUPER1_B 64 /* primary superblock */ |
155 | #define AIMAP_B (SUPER1_B + 8) /* 1st extent of aggregate inode map */ |
156 | #define AITBL_B (AIMAP_B + 16) /* |
157 | * 1st extent of aggregate inode table |
158 | */ |
159 | #define SUPER2_B (AITBL_B + 32) /* 2ndary superblock pbn */ |
160 | #define BMAP_B (SUPER2_B + 8) /* block allocation map */ |
161 | |
162 | /* |
163 | * SIZE_OF_SUPER defines the total amount of space reserved on disk for the |
164 | * superblock. This is not the same as the superblock structure, since all of |
165 | * this space is not currently being used. |
166 | */ |
167 | #define SIZE_OF_SUPER PSIZE |
168 | |
169 | /* |
170 | * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table |
171 | */ |
172 | #define SIZE_OF_AG_TABLE PSIZE |
173 | |
174 | /* |
175 | * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of |
176 | * the inode allocation map (to hold iag) |
177 | */ |
178 | #define SIZE_OF_MAP_PAGE PSIZE |
179 | |
180 | /* |
181 | * fixed byte offset address |
182 | */ |
183 | #define SUPER1_OFF 0x8000 /* primary superblock */ |
184 | #define AIMAP_OFF (SUPER1_OFF + SIZE_OF_SUPER) |
185 | /* |
186 | * Control page of aggregate inode map |
187 | * followed by 1st extent of map |
188 | */ |
189 | #define AITBL_OFF (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1)) |
190 | /* |
191 | * 1st extent of aggregate inode table |
192 | */ |
193 | #define SUPER2_OFF (AITBL_OFF + INODE_EXTENT_SIZE) |
194 | /* |
195 | * secondary superblock |
196 | */ |
197 | #define BMAP_OFF (SUPER2_OFF + SIZE_OF_SUPER) |
198 | /* |
199 | * block allocation map |
200 | */ |
201 | |
202 | /* |
203 | * The following macro is used to indicate the number of reserved disk blocks at |
204 | * the front of an aggregate, in terms of physical blocks. This value is |
205 | * currently defined to be 32K. This turns out to be the same as the primary |
206 | * superblock's address, since it directly follows the reserved blocks. |
207 | */ |
208 | #define AGGR_RSVD_BLOCKS SUPER1_B |
209 | |
210 | /* |
211 | * The following macro is used to indicate the number of reserved bytes at the |
212 | * front of an aggregate. This value is currently defined to be 32K. This |
213 | * turns out to be the same as the primary superblock's byte offset, since it |
214 | * directly follows the reserved blocks. |
215 | */ |
216 | #define AGGR_RSVD_BYTES SUPER1_OFF |
217 | |
218 | /* |
219 | * The following macro defines the byte offset for the first inode extent in |
220 | * the aggregate inode table. This allows us to find the self inode to find the |
221 | * rest of the table. Currently this value is 44K. |
222 | */ |
223 | #define AGGR_INODE_TABLE_START AITBL_OFF |
224 | |
225 | /* |
226 | * fixed reserved inode number |
227 | */ |
228 | /* aggregate inode */ |
229 | #define AGGR_RESERVED_I 0 /* aggregate inode (reserved) */ |
230 | #define AGGREGATE_I 1 /* aggregate inode map inode */ |
231 | #define BMAP_I 2 /* aggregate block allocation map inode */ |
232 | #define LOG_I 3 /* aggregate inline log inode */ |
233 | #define BADBLOCK_I 4 /* aggregate bad block inode */ |
234 | #define FILESYSTEM_I 16 /* 1st/only fileset inode in ait: |
235 | * fileset inode map inode |
236 | */ |
237 | |
238 | /* per fileset inode */ |
239 | #define FILESET_RSVD_I 0 /* fileset inode (reserved) */ |
240 | #define FILESET_EXT_I 1 /* fileset inode extension */ |
241 | #define ROOT_I 2 /* fileset root inode */ |
242 | #define ACL_I 3 /* fileset ACL inode */ |
243 | |
244 | #define FILESET_OBJECT_I 4 /* the first fileset inode available for a file |
245 | * or directory or link... |
246 | */ |
247 | #define FIRST_FILESET_INO 16 /* the first aggregate inode which describes |
248 | * an inode. (To fsck this is also the first |
249 | * inode in part 2 of the agg inode table.) |
250 | */ |
251 | |
252 | /* |
253 | * directory configuration |
254 | */ |
255 | #define JFS_NAME_MAX 255 |
256 | #define JFS_PATH_MAX BPSIZE |
257 | |
258 | |
259 | /* |
260 | * file system state (superblock state) |
261 | */ |
262 | #define FM_CLEAN 0x00000000 /* file system is unmounted and clean */ |
263 | #define FM_MOUNT 0x00000001 /* file system is mounted cleanly */ |
264 | #define FM_DIRTY 0x00000002 /* file system was not unmounted and clean |
265 | * when mounted or |
266 | * commit failure occurred while being mounted: |
267 | * fsck() must be run to repair |
268 | */ |
269 | #define FM_LOGREDO 0x00000004 /* log based recovery (logredo()) failed: |
270 | * fsck() must be run to repair |
271 | */ |
272 | #define FM_EXTENDFS 0x00000008 /* file system extendfs() in progress */ |
273 | #define FM_STATE_MAX 0x0000000f /* max value of s_state */ |
274 | |
275 | #endif /* _H_JFS_FILSYS */ |
276 | |