Root/fs/jfs/jfs_filsys.h

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
33/* directory option */
34#define JFS_UNICODE 0x00000001 /* unicode name */
35
36/* mount time flags for error handling */
37#define JFS_ERR_REMOUNT_RO 0x00000002 /* remount read-only */
38#define JFS_ERR_CONTINUE 0x00000004 /* continue */
39#define JFS_ERR_PANIC 0x00000008 /* panic */
40
41/* Quota support */
42#define JFS_USRQUOTA 0x00000010
43#define JFS_GRPQUOTA 0x00000020
44
45/* mount time flag to disable journaling to disk */
46#define JFS_NOINTEGRITY 0x00000040
47
48/* commit option */
49#define JFS_COMMIT 0x00000f00 /* commit option mask */
50#define JFS_GROUPCOMMIT 0x00000100 /* group (of 1) commit */
51#define JFS_LAZYCOMMIT 0x00000200 /* lazy commit */
52#define JFS_TMPFS 0x00000400 /* temporary file system -
53                     * do not log/commit:
54                     * Never implemented
55                     */
56
57/* log logical volume option */
58#define JFS_INLINELOG 0x00000800 /* inline log within file system */
59#define JFS_INLINEMOVE 0x00001000 /* inline log being moved */
60
61/* Secondary aggregate inode table */
62#define JFS_BAD_SAIT 0x00010000 /* current secondary ait is bad */
63
64/* sparse regular file support */
65#define JFS_SPARSE 0x00020000 /* sparse regular file */
66
67/* DASD Limits F226941 */
68#define JFS_DASD_ENABLED 0x00040000 /* DASD limits enabled */
69#define JFS_DASD_PRIME 0x00080000 /* Prime DASD usage on boot */
70
71/* big endian flag */
72#define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */
73
74/* Directory index */
75#define JFS_DIR_INDEX 0x00200000 /* Persistent index for */
76
77/* platform options */
78#define JFS_LINUX 0x10000000 /* Linux support */
79#define JFS_DFS 0x20000000 /* DCE DFS LFS support */
80/* Never implemented */
81
82#define JFS_OS2 0x40000000 /* OS/2 support */
83/* case-insensitive name/directory support */
84
85#define JFS_AIX 0x80000000 /* AIX support */
86
87/*
88 * buffer cache configuration
89 */
90/* page size */
91#ifdef PSIZE
92#undef PSIZE
93#endif
94#define PSIZE 4096 /* page size (in byte) */
95#define L2PSIZE 12 /* log2(PSIZE) */
96#define POFFSET 4095 /* offset within page */
97
98/* buffer page size */
99#define BPSIZE PSIZE
100
101/*
102 * fs fundamental size
103 *
104 * PSIZE >= file system block size >= PBSIZE >= DISIZE
105 */
106#define PBSIZE 512 /* physical block size (in byte) */
107#define L2PBSIZE 9 /* log2(PBSIZE) */
108
109#define DISIZE 512 /* on-disk inode size (in byte) */
110#define L2DISIZE 9 /* log2(DISIZE) */
111
112#define IDATASIZE 256 /* inode inline data size */
113#define IXATTRSIZE 128 /* inode inline extended attribute size */
114
115#define XTPAGE_SIZE 4096
116#define log2_PAGESIZE 12
117
118#define IAG_SIZE 4096
119#define IAG_EXTENT_SIZE 4096
120#define INOSPERIAG 4096 /* number of disk inodes per iag */
121#define L2INOSPERIAG 12 /* l2 number of disk inodes per iag */
122#define INOSPEREXT 32 /* number of disk inode per extent */
123#define L2INOSPEREXT 5 /* l2 number of disk inode per extent */
124#define IXSIZE (DISIZE * INOSPEREXT) /* inode extent size */
125#define INOSPERPAGE 8 /* number of disk inodes per 4K page */
126#define L2INOSPERPAGE 3 /* log2(INOSPERPAGE) */
127
128#define IAGFREELIST_LWM 64
129
130#define INODE_EXTENT_SIZE IXSIZE /* inode extent size */
131#define NUM_INODE_PER_EXTENT INOSPEREXT
132#define NUM_INODE_PER_IAG INOSPERIAG
133
134#define MINBLOCKSIZE 512
135#define MAXBLOCKSIZE 4096
136#define MAXFILESIZE ((s64)1 << 52)
137
138#define JFS_LINK_MAX 0xffffffff
139
140/* Minimum number of bytes supported for a JFS partition */
141#define MINJFS (0x1000000)
142#define MINJFSTEXT "16"
143
144/*
145 * file system block size -> physical block size
146 */
147#define LBOFFSET(x) ((x) & (PBSIZE - 1))
148#define LBNUMBER(x) ((x) >> L2PBSIZE)
149#define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE))
150#define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE))
151/* size in byte -> last page number */
152#define SIZE2PN(size) ( ((s64)((size) - 1)) >> (L2PSIZE) )
153/* size in byte -> last file system block number */
154#define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
155
156/*
157 * fixed physical block address (physical block size = 512 byte)
158 *
159 * NOTE: since we can't guarantee a physical block size of 512 bytes the use of
160 * these macros should be removed and the byte offset macros used instead.
161 */
162#define SUPER1_B 64 /* primary superblock */
163#define AIMAP_B (SUPER1_B + 8) /* 1st extent of aggregate inode map */
164#define AITBL_B (AIMAP_B + 16) /*
165                     * 1st extent of aggregate inode table
166                     */
167#define SUPER2_B (AITBL_B + 32) /* 2ndary superblock pbn */
168#define BMAP_B (SUPER2_B + 8) /* block allocation map */
169
170/*
171 * SIZE_OF_SUPER defines the total amount of space reserved on disk for the
172 * superblock. This is not the same as the superblock structure, since all of
173 * this space is not currently being used.
174 */
175#define SIZE_OF_SUPER PSIZE
176
177/*
178 * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
179 */
180#define SIZE_OF_AG_TABLE PSIZE
181
182/*
183 * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
184 * the inode allocation map (to hold iag)
185 */
186#define SIZE_OF_MAP_PAGE PSIZE
187
188/*
189 * fixed byte offset address
190 */
191#define SUPER1_OFF 0x8000 /* primary superblock */
192#define AIMAP_OFF (SUPER1_OFF + SIZE_OF_SUPER)
193                    /*
194                     * Control page of aggregate inode map
195                     * followed by 1st extent of map
196                     */
197#define AITBL_OFF (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
198                    /*
199                     * 1st extent of aggregate inode table
200                     */
201#define SUPER2_OFF (AITBL_OFF + INODE_EXTENT_SIZE)
202                    /*
203                     * secondary superblock
204                     */
205#define BMAP_OFF (SUPER2_OFF + SIZE_OF_SUPER)
206                    /*
207                     * block allocation map
208                     */
209
210/*
211 * The following macro is used to indicate the number of reserved disk blocks at
212 * the front of an aggregate, in terms of physical blocks. This value is
213 * currently defined to be 32K. This turns out to be the same as the primary
214 * superblock's address, since it directly follows the reserved blocks.
215 */
216#define AGGR_RSVD_BLOCKS SUPER1_B
217
218/*
219 * The following macro is used to indicate the number of reserved bytes at the
220 * front of an aggregate. This value is currently defined to be 32K. This
221 * turns out to be the same as the primary superblock's byte offset, since it
222 * directly follows the reserved blocks.
223 */
224#define AGGR_RSVD_BYTES SUPER1_OFF
225
226/*
227 * The following macro defines the byte offset for the first inode extent in
228 * the aggregate inode table. This allows us to find the self inode to find the
229 * rest of the table. Currently this value is 44K.
230 */
231#define AGGR_INODE_TABLE_START AITBL_OFF
232
233/*
234 * fixed reserved inode number
235 */
236/* aggregate inode */
237#define AGGR_RESERVED_I 0 /* aggregate inode (reserved) */
238#define AGGREGATE_I 1 /* aggregate inode map inode */
239#define BMAP_I 2 /* aggregate block allocation map inode */
240#define LOG_I 3 /* aggregate inline log inode */
241#define BADBLOCK_I 4 /* aggregate bad block inode */
242#define FILESYSTEM_I 16 /* 1st/only fileset inode in ait:
243                 * fileset inode map inode
244                 */
245
246/* per fileset inode */
247#define FILESET_RSVD_I 0 /* fileset inode (reserved) */
248#define FILESET_EXT_I 1 /* fileset inode extension */
249#define ROOT_I 2 /* fileset root inode */
250#define ACL_I 3 /* fileset ACL inode */
251
252#define FILESET_OBJECT_I 4 /* the first fileset inode available for a file
253                 * or directory or link...
254                 */
255#define FIRST_FILESET_INO 16 /* the first aggregate inode which describes
256                 * an inode. (To fsck this is also the first
257                 * inode in part 2 of the agg inode table.)
258                 */
259
260/*
261 * directory configuration
262 */
263#define JFS_NAME_MAX 255
264#define JFS_PATH_MAX BPSIZE
265
266
267/*
268 * file system state (superblock state)
269 */
270#define FM_CLEAN 0x00000000 /* file system is unmounted and clean */
271#define FM_MOUNT 0x00000001 /* file system is mounted cleanly */
272#define FM_DIRTY 0x00000002 /* file system was not unmounted and clean
273                 * when mounted or
274                 * commit failure occurred while being mounted:
275                 * fsck() must be run to repair
276                 */
277#define FM_LOGREDO 0x00000004 /* log based recovery (logredo()) failed:
278                 * fsck() must be run to repair
279                 */
280#define FM_EXTENDFS 0x00000008 /* file system extendfs() in progress */
281
282#endif /* _H_JFS_FILSYS */
283

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