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 65535 /* nlink_t is unsigned short */ 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 */ 281