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