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 #define JFS_USRQUOTA 0x00000010 41 #define JFS_GRPQUOTA 0x00000020 42 43 /* platform option (conditional compilation) */ 44 #define JFS_AIX 0x80000000 /* AIX support */ 45 /* POSIX name/directory support */ 46 47 #define JFS_OS2 0x40000000 /* OS/2 support */ 48 /* case-insensitive name/directory support */ 49 50 #define JFS_DFS 0x20000000 /* DCE DFS LFS support */ 51 52 #define JFS_LINUX 0x10000000 /* Linux support */ 53 /* case-sensitive name/directory support */ 54 55 /* directory option */ 56 #define JFS_UNICODE 0x00000001 /* unicode name */ 57 58 /* commit option */ 59 #define JFS_COMMIT 0x00000f00 /* commit option mask */ 60 #define JFS_GROUPCOMMIT 0x00000100 /* group (of 1) commit */ 61 #define JFS_LAZYCOMMIT 0x00000200 /* lazy commit */ 62 #define JFS_TMPFS 0x00000400 /* temporary file system - 63 * do not log/commit: 64 */ 65 66 /* log logical volume option */ 67 #define JFS_INLINELOG 0x00000800 /* inline log within file system */ 68 #define JFS_INLINEMOVE 0x00001000 /* inline log being moved */ 69 70 /* Secondary aggregate inode table */ 71 #define JFS_BAD_SAIT 0x00010000 /* current secondary ait is bad */ 72 73 /* sparse regular file support */ 74 #define JFS_SPARSE 0x00020000 /* sparse regular file */ 75 76 /* DASD Limits F226941 */ 77 #define JFS_DASD_ENABLED 0x00040000 /* DASD limits enabled */ 78 #define JFS_DASD_PRIME 0x00080000 /* Prime DASD usage on boot */ 79 80 /* big endian flag */ 81 #define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */ 82 83 /* Directory index */ 84 #define JFS_DIR_INDEX 0x00200000 /* Persistant index for */ 85 /* directory entries */ 86 87 88 /* 89 * buffer cache configuration 90 */ 91 /* page size */ 92 #ifdef PSIZE 93 #undef PSIZE 94 #endif 95 #define PSIZE 4096 /* page size (in byte) */ 96 #define L2PSIZE 12 /* log2(PSIZE) */ 97 #define POFFSET 4095 /* offset within page */ 98 99 /* buffer page size */ 100 #define BPSIZE PSIZE 101 102 /* 103 * fs fundamental size 104 * 105 * PSIZE >= file system block size >= PBSIZE >= DISIZE 106 */ 107 #define PBSIZE 512 /* physical block size (in byte) */ 108 #define L2PBSIZE 9 /* log2(PBSIZE) */ 109 110 #define DISIZE 512 /* on-disk inode size (in byte) */ 111 #define L2DISIZE 9 /* log2(DISIZE) */ 112 113 #define IDATASIZE 256 /* inode inline data size */ 114 #define IXATTRSIZE 128 /* inode inline extended attribute size */ 115 116 #define XTPAGE_SIZE 4096 117 #define log2_PAGESIZE 12 118 119 #define IAG_SIZE 4096 120 #define IAG_EXTENT_SIZE 4096 121 #define INOSPERIAG 4096 /* number of disk inodes per iag */ 122 #define L2INOSPERIAG 12 /* l2 number of disk inodes per iag */ 123 #define INOSPEREXT 32 /* number of disk inode per extent */ 124 #define L2INOSPEREXT 5 /* l2 number of disk inode per extent */ 125 #define IXSIZE (DISIZE * INOSPEREXT) /* inode extent size */ 126 #define INOSPERPAGE 8 /* number of disk inodes per 4K page */ 127 #define L2INOSPERPAGE 3 /* log2(INOSPERPAGE) */ 128 129 #define IAGFREELIST_LWM 64 130 131 #define INODE_EXTENT_SIZE IXSIZE /* inode extent size */ 132 #define NUM_INODE_PER_EXTENT INOSPEREXT 133 #define NUM_INODE_PER_IAG INOSPERIAG 134 135 #define MINBLOCKSIZE 512 136 #define MAXBLOCKSIZE 4096 137 #define MAXFILESIZE ((s64)1 << 52) 138 139 #define JFS_LINK_MAX 0xffffffff 140 141 /* Minimum number of bytes supported for a JFS partition */ 142 #define MINJFS (0x1000000) 143 #define MINJFSTEXT "16" 144 145 /* 146 * file system block size -> physical block size 147 */ 148 #define LBOFFSET(x) ((x) & (PBSIZE - 1)) 149 #define LBNUMBER(x) ((x) >> L2PBSIZE) 150 #define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE)) 151 #define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE)) 152 /* size in byte -> last page number */ 153 #define SIZE2PN(size) ( ((s64)((size) - 1)) >> (L2PSIZE) ) 154 /* size in byte -> last file system block number */ 155 #define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) ) 156 157 /* 158 * fixed physical block address (physical block size = 512 byte) 159 * 160 * NOTE: since we can't guarantee a physical block size of 512 bytes the use of 161 * these macros should be removed and the byte offset macros used instead. 162 */ 163 #define SUPER1_B 64 /* primary superblock */ 164 #define AIMAP_B (SUPER1_B + 8) /* 1st extent of aggregate inode map */ 165 #define AITBL_B (AIMAP_B + 16) /* 166 * 1st extent of aggregate inode table 167 */ 168 #define SUPER2_B (AITBL_B + 32) /* 2ndary superblock pbn */ 169 #define BMAP_B (SUPER2_B + 8) /* block allocation map */ 170 171 /* 172 * SIZE_OF_SUPER defines the total amount of space reserved on disk for the 173 * superblock. This is not the same as the superblock structure, since all of 174 * this space is not currently being used. 175 */ 176 #define SIZE_OF_SUPER PSIZE 177 178 /* 179 * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table 180 */ 181 #define SIZE_OF_AG_TABLE PSIZE 182 183 /* 184 * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of 185 * the inode allocation map (to hold iag) 186 */ 187 #define SIZE_OF_MAP_PAGE PSIZE 188 189 /* 190 * fixed byte offset address 191 */ 192 #define SUPER1_OFF 0x8000 /* primary superblock */ 193 #define AIMAP_OFF (SUPER1_OFF + SIZE_OF_SUPER) 194 /* 195 * Control page of aggregate inode map 196 * followed by 1st extent of map 197 */ 198 #define AITBL_OFF (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1)) 199 /* 200 * 1st extent of aggregate inode table 201 */ 202 #define SUPER2_OFF (AITBL_OFF + INODE_EXTENT_SIZE) 203 /* 204 * secondary superblock 205 */ 206 #define BMAP_OFF (SUPER2_OFF + SIZE_OF_SUPER) 207 /* 208 * block allocation map 209 */ 210 211 /* 212 * The following macro is used to indicate the number of reserved disk blocks at 213 * the front of an aggregate, in terms of physical blocks. This value is 214 * currently defined to be 32K. This turns out to be the same as the primary 215 * superblock's address, since it directly follows the reserved blocks. 216 */ 217 #define AGGR_RSVD_BLOCKS SUPER1_B 218 219 /* 220 * The following macro is used to indicate the number of reserved bytes at the 221 * front of an aggregate. This value is currently defined to be 32K. This 222 * turns out to be the same as the primary superblock's byte offset, since it 223 * directly follows the reserved blocks. 224 */ 225 #define AGGR_RSVD_BYTES SUPER1_OFF 226 227 /* 228 * The following macro defines the byte offset for the first inode extent in 229 * the aggregate inode table. This allows us to find the self inode to find the 230 * rest of the table. Currently this value is 44K. 231 */ 232 #define AGGR_INODE_TABLE_START AITBL_OFF 233 234 /* 235 * fixed reserved inode number 236 */ 237 /* aggregate inode */ 238 #define AGGR_RESERVED_I 0 /* aggregate inode (reserved) */ 239 #define AGGREGATE_I 1 /* aggregate inode map inode */ 240 #define BMAP_I 2 /* aggregate block allocation map inode */ 241 #define LOG_I 3 /* aggregate inline log inode */ 242 #define BADBLOCK_I 4 /* aggregate bad block inode */ 243 #define FILESYSTEM_I 16 /* 1st/only fileset inode in ait: 244 * fileset inode map inode 245 */ 246 247 /* per fileset inode */ 248 #define FILESET_RSVD_I 0 /* fileset inode (reserved) */ 249 #define FILESET_EXT_I 1 /* fileset inode extension */ 250 #define ROOT_I 2 /* fileset root inode */ 251 #define ACL_I 3 /* fileset ACL inode */ 252 253 #define FILESET_OBJECT_I 4 /* the first fileset inode available for a file 254 * or directory or link... 255 */ 256 #define FIRST_FILESET_INO 16 /* the first aggregate inode which describes 257 * an inode. (To fsck this is also the first 258 * inode in part 2 of the agg inode table.) 259 */ 260 261 /* 262 * directory configuration 263 */ 264 #define JFS_NAME_MAX 255 265 #define JFS_PATH_MAX BPSIZE 266 267 268 /* 269 * file system state (superblock state) 270 */ 271 #define FM_CLEAN 0x00000000 /* file system is unmounted and clean */ 272 #define FM_MOUNT 0x00000001 /* file system is mounted cleanly */ 273 #define FM_DIRTY 0x00000002 /* file system was not unmounted and clean 274 * when mounted or 275 * commit failure occurred while being mounted: 276 * fsck() must be run to repair 277 */ 278 #define FM_LOGREDO 0x00000004 /* log based recovery (logredo()) failed: 279 * fsck() must be run to repair 280 */ 281 #define FM_EXTENDFS 0x00000008 /* file system extendfs() in progress */ 282 283 #endif /* _H_JFS_FILSYS */ 284