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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/jfs/jfs_filsys.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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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 */