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 /* mount time flag to enable TRIM to ssd disks */ 49 #define JFS_DISCARD 0x00000080 50 51 /* commit option */ 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 - 56 * do not log/commit: 57 * Never implemented 58 */ 59 60 /* log logical volume option */ 61 #define JFS_INLINELOG 0x00000800 /* inline log within file system */ 62 #define JFS_INLINEMOVE 0x00001000 /* inline log being moved */ 63 64 /* Secondary aggregate inode table */ 65 #define JFS_BAD_SAIT 0x00010000 /* current secondary ait is bad */ 66 67 /* sparse regular file support */ 68 #define JFS_SPARSE 0x00020000 /* sparse regular file */ 69 70 /* DASD Limits F226941 */ 71 #define JFS_DASD_ENABLED 0x00040000 /* DASD limits enabled */ 72 #define JFS_DASD_PRIME 0x00080000 /* Prime DASD usage on boot */ 73 74 /* big endian flag */ 75 #define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */ 76 77 /* Directory index */ 78 #define JFS_DIR_INDEX 0x00200000 /* Persistent index for */ 79 80 /* platform options */ 81 #define JFS_LINUX 0x10000000 /* Linux support */ 82 #define JFS_DFS 0x20000000 /* DCE DFS LFS support */ 83 /* Never implemented */ 84 85 #define JFS_OS2 0x40000000 /* OS/2 support */ 86 /* case-insensitive name/directory support */ 87 88 #define JFS_AIX 0x80000000 /* AIX support */ 89 90 /* 91 * buffer cache configuration 92 */ 93 /* page size */ 94 #ifdef PSIZE 95 #undef PSIZE 96 #endif 97 #define PSIZE 4096 /* page size (in byte) */ 98 #define L2PSIZE 12 /* log2(PSIZE) */ 99 #define POFFSET 4095 /* offset within page */ 100 101 /* buffer page size */ 102 #define BPSIZE PSIZE 103 104 /* 105 * fs fundamental size 106 * 107 * PSIZE >= file system block size >= PBSIZE >= DISIZE 108 */ 109 #define PBSIZE 512 /* physical block size (in byte) */ 110 #define L2PBSIZE 9 /* log2(PBSIZE) */ 111 112 #define DISIZE 512 /* on-disk inode size (in byte) */ 113 #define L2DISIZE 9 /* log2(DISIZE) */ 114 115 #define IDATASIZE 256 /* inode inline data size */ 116 #define IXATTRSIZE 128 /* inode inline extended attribute size */ 117 118 #define XTPAGE_SIZE 4096 119 #define log2_PAGESIZE 12 120 121 #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) */ 130 131 #define IAGFREELIST_LWM 64 132 133 #define INODE_EXTENT_SIZE IXSIZE /* inode extent size */ 134 #define NUM_INODE_PER_EXTENT INOSPEREXT 135 #define NUM_INODE_PER_IAG INOSPERIAG 136 137 #define MINBLOCKSIZE 512 138 #define MAXBLOCKSIZE 4096 139 #define MAXFILESIZE ((s64)1 << 52) 140 141 #define JFS_LINK_MAX 0xffffffff 142 143 /* Minimum number of bytes supported for a JFS partition */ 144 #define MINJFS (0x1000000) 145 #define MINJFSTEXT "16" 146 147 /* 148 * file system block size -> physical block size 149 */ 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) ) 158 159 /* 160 * fixed physical block address (physical block size = 512 byte) 161 * 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. 164 */ 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 169 */ 170 #define SUPER2_B (AITBL_B + 32) /* 2ndary superblock pbn */ 171 #define BMAP_B (SUPER2_B + 8) /* block allocation map */ 172 173 /* 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. 177 */ 178 #define SIZE_OF_SUPER PSIZE 179 180 /* 181 * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table 182 */ 183 #define SIZE_OF_AG_TABLE PSIZE 184 185 /* 186 * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of 187 * the inode allocation map (to hold iag) 188 */ 189 #define SIZE_OF_MAP_PAGE PSIZE 190 191 /* 192 * fixed byte offset address 193 */ 194 #define SUPER1_OFF 0x8000 /* primary superblock */ 195 #define AIMAP_OFF (SUPER1_OFF + SIZE_OF_SUPER) 196 /* 197 * Control page of aggregate inode map 198 * followed by 1st extent of map 199 */ 200 #define AITBL_OFF (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1)) 201 /* 202 * 1st extent of aggregate inode table 203 */ 204 #define SUPER2_OFF (AITBL_OFF + INODE_EXTENT_SIZE) 205 /* 206 * secondary superblock 207 */ 208 #define BMAP_OFF (SUPER2_OFF + SIZE_OF_SUPER) 209 /* 210 * block allocation map 211 */ 212 213 /* 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. 218 */ 219 #define AGGR_RSVD_BLOCKS SUPER1_B 220 221 /* 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. 226 */ 227 #define AGGR_RSVD_BYTES SUPER1_OFF 228 229 /* 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. 233 */ 234 #define AGGR_INODE_TABLE_START AITBL_OFF 235 236 /* 237 * fixed reserved inode number 238 */ 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 247 */ 248 249 /* 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 */ 254 255 #define FILESET_OBJECT_I 4 /* the first fileset inode available for a file 256 * or directory or link... 257 */ 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.) 261 */ 262 263 /* 264 * directory configuration 265 */ 266 #define JFS_NAME_MAX 255 267 #define JFS_PATH_MAX BPSIZE 268 269 270 /* 271 * file system state (superblock state) 272 */ 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 276 * when mounted or 277 * commit failure occurred while being mounted: 278 * fsck() must be run to repair 279 */ 280 #define FM_LOGREDO 0x00000004 /* log based recovery (logredo()) failed: 281 * fsck() must be run to repair 282 */ 283 #define FM_EXTENDFS 0x00000008 /* file system extendfs() in progress */ 284 285 #endif /* _H_JFS_FILSYS */ 286