2 * Copyright (C) International Business Machines Corp., 2000-2003
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.
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.
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
24 * file system (implementation-dependent) constants
26 * refer to <limits.h> for system wide implementation-dependent constants
30 * file system option (superblock flag)
33 /* directory option */
34 #define JFS_UNICODE 0x00000001 /* unicode name */
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 */
42 #define JFS_USRQUOTA 0x00000010
43 #define JFS_GRPQUOTA 0x00000020
45 /* mount time flag to disable journaling to disk */
46 #define JFS_NOINTEGRITY 0x00000040
48 /* mount time flag to enable TRIM to ssd disks */
49 #define JFS_DISCARD 0x00000080
52 #define JFS_COMMIT 0x00000f00 /* commit option mask */
53 #define JFS_GROUPCOMMIT 0x00000100 /* group (of 1) commit */
54 #define JFS_LAZYCOMMIT 0x00000200 /* lazy commit */
55 #define JFS_TMPFS 0x00000400 /* temporary file system -
60 /* log logical volume option */
61 #define JFS_INLINELOG 0x00000800 /* inline log within file system */
62 #define JFS_INLINEMOVE 0x00001000 /* inline log being moved */
64 /* Secondary aggregate inode table */
65 #define JFS_BAD_SAIT 0x00010000 /* current secondary ait is bad */
67 /* sparse regular file support */
68 #define JFS_SPARSE 0x00020000 /* sparse regular file */
70 /* DASD Limits F226941 */
71 #define JFS_DASD_ENABLED 0x00040000 /* DASD limits enabled */
72 #define JFS_DASD_PRIME 0x00080000 /* Prime DASD usage on boot */
75 #define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */
78 #define JFS_DIR_INDEX 0x00200000 /* Persistent index for */
80 /* platform options */
81 #define JFS_LINUX 0x10000000 /* Linux support */
82 #define JFS_DFS 0x20000000 /* DCE DFS LFS support */
83 /* Never implemented */
85 #define JFS_OS2 0x40000000 /* OS/2 support */
86 /* case-insensitive name/directory support */
88 #define JFS_AIX 0x80000000 /* AIX support */
91 * buffer cache configuration
97 #define PSIZE 4096 /* page size (in byte) */
98 #define L2PSIZE 12 /* log2(PSIZE) */
99 #define POFFSET 4095 /* offset within page */
101 /* buffer page size */
105 * fs fundamental size
107 * PSIZE >= file system block size >= PBSIZE >= DISIZE
109 #define PBSIZE 512 /* physical block size (in byte) */
110 #define L2PBSIZE 9 /* log2(PBSIZE) */
112 #define DISIZE 512 /* on-disk inode size (in byte) */
113 #define L2DISIZE 9 /* log2(DISIZE) */
115 #define IDATASIZE 256 /* inode inline data size */
116 #define IXATTRSIZE 128 /* inode inline extended attribute size */
118 #define XTPAGE_SIZE 4096
119 #define log2_PAGESIZE 12
121 #define IAG_SIZE 4096
122 #define IAG_EXTENT_SIZE 4096
123 #define INOSPERIAG 4096 /* number of disk inodes per iag */
124 #define L2INOSPERIAG 12 /* l2 number of disk inodes per iag */
125 #define INOSPEREXT 32 /* number of disk inode per extent */
126 #define L2INOSPEREXT 5 /* l2 number of disk inode per extent */
127 #define IXSIZE (DISIZE * INOSPEREXT) /* inode extent size */
128 #define INOSPERPAGE 8 /* number of disk inodes per 4K page */
129 #define L2INOSPERPAGE 3 /* log2(INOSPERPAGE) */
131 #define IAGFREELIST_LWM 64
133 #define INODE_EXTENT_SIZE IXSIZE /* inode extent size */
134 #define NUM_INODE_PER_EXTENT INOSPEREXT
135 #define NUM_INODE_PER_IAG INOSPERIAG
137 #define MINBLOCKSIZE 512
138 #define MAXBLOCKSIZE 4096
139 #define MAXFILESIZE ((s64)1 << 52)
141 #define JFS_LINK_MAX 0xffffffff
143 /* Minimum number of bytes supported for a JFS partition */
144 #define MINJFS (0x1000000)
145 #define MINJFSTEXT "16"
148 * file system block size -> physical block size
150 #define LBOFFSET(x) ((x) & (PBSIZE - 1))
151 #define LBNUMBER(x) ((x) >> L2PBSIZE)
152 #define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE))
153 #define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE))
154 /* size in byte -> last page number */
155 #define SIZE2PN(size) ( ((s64)((size) - 1)) >> (L2PSIZE) )
156 /* size in byte -> last file system block number */
157 #define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) )
160 * fixed physical block address (physical block size = 512 byte)
162 * NOTE: since we can't guarantee a physical block size of 512 bytes the use of
163 * these macros should be removed and the byte offset macros used instead.
165 #define SUPER1_B 64 /* primary superblock */
166 #define AIMAP_B (SUPER1_B + 8) /* 1st extent of aggregate inode map */
167 #define AITBL_B (AIMAP_B + 16) /*
168 * 1st extent of aggregate inode table
170 #define SUPER2_B (AITBL_B + 32) /* 2ndary superblock pbn */
171 #define BMAP_B (SUPER2_B + 8) /* block allocation map */
174 * SIZE_OF_SUPER defines the total amount of space reserved on disk for the
175 * superblock. This is not the same as the superblock structure, since all of
176 * this space is not currently being used.
178 #define SIZE_OF_SUPER PSIZE
181 * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table
183 #define SIZE_OF_AG_TABLE PSIZE
186 * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of
187 * the inode allocation map (to hold iag)
189 #define SIZE_OF_MAP_PAGE PSIZE
192 * fixed byte offset address
194 #define SUPER1_OFF 0x8000 /* primary superblock */
195 #define AIMAP_OFF (SUPER1_OFF + SIZE_OF_SUPER)
197 * Control page of aggregate inode map
198 * followed by 1st extent of map
200 #define AITBL_OFF (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1))
202 * 1st extent of aggregate inode table
204 #define SUPER2_OFF (AITBL_OFF + INODE_EXTENT_SIZE)
206 * secondary superblock
208 #define BMAP_OFF (SUPER2_OFF + SIZE_OF_SUPER)
210 * block allocation map
214 * The following macro is used to indicate the number of reserved disk blocks at
215 * the front of an aggregate, in terms of physical blocks. This value is
216 * currently defined to be 32K. This turns out to be the same as the primary
217 * superblock's address, since it directly follows the reserved blocks.
219 #define AGGR_RSVD_BLOCKS SUPER1_B
222 * The following macro is used to indicate the number of reserved bytes at the
223 * front of an aggregate. This value is currently defined to be 32K. This
224 * turns out to be the same as the primary superblock's byte offset, since it
225 * directly follows the reserved blocks.
227 #define AGGR_RSVD_BYTES SUPER1_OFF
230 * The following macro defines the byte offset for the first inode extent in
231 * the aggregate inode table. This allows us to find the self inode to find the
232 * rest of the table. Currently this value is 44K.
234 #define AGGR_INODE_TABLE_START AITBL_OFF
237 * fixed reserved inode number
239 /* aggregate inode */
240 #define AGGR_RESERVED_I 0 /* aggregate inode (reserved) */
241 #define AGGREGATE_I 1 /* aggregate inode map inode */
242 #define BMAP_I 2 /* aggregate block allocation map inode */
243 #define LOG_I 3 /* aggregate inline log inode */
244 #define BADBLOCK_I 4 /* aggregate bad block inode */
245 #define FILESYSTEM_I 16 /* 1st/only fileset inode in ait:
246 * fileset inode map inode
249 /* per fileset inode */
250 #define FILESET_RSVD_I 0 /* fileset inode (reserved) */
251 #define FILESET_EXT_I 1 /* fileset inode extension */
252 #define ROOT_I 2 /* fileset root inode */
253 #define ACL_I 3 /* fileset ACL inode */
255 #define FILESET_OBJECT_I 4 /* the first fileset inode available for a file
256 * or directory or link...
258 #define FIRST_FILESET_INO 16 /* the first aggregate inode which describes
259 * an inode. (To fsck this is also the first
260 * inode in part 2 of the agg inode table.)
264 * directory configuration
266 #define JFS_NAME_MAX 255
267 #define JFS_PATH_MAX BPSIZE
271 * file system state (superblock state)
273 #define FM_CLEAN 0x00000000 /* file system is unmounted and clean */
274 #define FM_MOUNT 0x00000001 /* file system is mounted cleanly */
275 #define FM_DIRTY 0x00000002 /* file system was not unmounted and clean
277 * commit failure occurred while being mounted:
278 * fsck() must be run to repair
280 #define FM_LOGREDO 0x00000004 /* log based recovery (logredo()) failed:
281 * fsck() must be run to repair
283 #define FM_EXTENDFS 0x00000008 /* file system extendfs() in progress */
284 #define FM_STATE_MAX 0x0000000f /* max value of s_state */
286 #endif /* _H_JFS_FILSYS */