1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) International Business Machines Corp., 2000-2003 4 */ 5 #ifndef _H_JFS_FILSYS 6 #define _H_JFS_FILSYS 7 8 /* 9 * jfs_filsys.h 10 * 11 * file system (implementation-dependent) constants 12 * 13 * refer to <limits.h> for system wide implementation-dependent constants 14 */ 15 16 /* 17 * file system option (superblock flag) 18 */ 19 20 /* directory option */ 21 #define JFS_UNICODE 0x00000001 /* unicode name */ 22 23 /* mount time flags for error handling */ 24 #define JFS_ERR_REMOUNT_RO 0x00000002 /* remount read-only */ 25 #define JFS_ERR_CONTINUE 0x00000004 /* continue */ 26 #define JFS_ERR_PANIC 0x00000008 /* panic */ 27 #define JFS_ERR_MASK (JFS_ERR_REMOUNT_RO|JFS_ERR_CONTINUE|JFS_ERR_PANIC) 28 29 /* Quota support */ 30 #define JFS_USRQUOTA 0x00000010 31 #define JFS_GRPQUOTA 0x00000020 32 33 /* mount time flag to disable journaling to disk */ 34 #define JFS_NOINTEGRITY 0x00000040 35 36 /* mount time flag to enable TRIM to ssd disks */ 37 #define JFS_DISCARD 0x00000080 38 39 /* commit option */ 40 #define JFS_COMMIT 0x00000f00 /* commit option mask */ 41 #define JFS_GROUPCOMMIT 0x00000100 /* group (of 1) commit */ 42 #define JFS_LAZYCOMMIT 0x00000200 /* lazy commit */ 43 #define JFS_TMPFS 0x00000400 /* temporary file system - 44 * do not log/commit: 45 * Never implemented 46 */ 47 48 /* log logical volume option */ 49 #define JFS_INLINELOG 0x00000800 /* inline log within file system */ 50 #define JFS_INLINEMOVE 0x00001000 /* inline log being moved */ 51 52 /* Secondary aggregate inode table */ 53 #define JFS_BAD_SAIT 0x00010000 /* current secondary ait is bad */ 54 55 /* sparse regular file support */ 56 #define JFS_SPARSE 0x00020000 /* sparse regular file */ 57 58 /* DASD Limits F226941 */ 59 #define JFS_DASD_ENABLED 0x00040000 /* DASD limits enabled */ 60 #define JFS_DASD_PRIME 0x00080000 /* Prime DASD usage on boot */ 61 62 /* big endian flag */ 63 #define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */ 64 65 /* Directory index */ 66 #define JFS_DIR_INDEX 0x00200000 /* Persistent index for */ 67 68 /* platform options */ 69 #define JFS_LINUX 0x10000000 /* Linux support */ 70 #define JFS_DFS 0x20000000 /* DCE DFS LFS support */ 71 /* Never implemented */ 72 73 #define JFS_OS2 0x40000000 /* OS/2 support */ 74 /* case-insensitive name/directory support */ 75 76 #define JFS_AIX 0x80000000 /* AIX support */ 77 78 /* 79 * buffer cache configuration 80 */ 81 /* page size */ 82 #ifdef PSIZE 83 #undef PSIZE 84 #endif 85 #define PSIZE 4096 /* page size (in byte) */ 86 #define L2PSIZE 12 /* log2(PSIZE) */ 87 #define POFFSET 4095 /* offset within page */ 88 89 /* buffer page size */ 90 #define BPSIZE PSIZE 91 92 /* 93 * fs fundamental size 94 * 95 * PSIZE >= file system block size >= PBSIZE >= DISIZE 96 */ 97 #define PBSIZE 512 /* physical block size (in byte) */ 98 #define L2PBSIZE 9 /* log2(PBSIZE) */ 99 100 #define DISIZE 512 /* on-disk inode size (in byte) */ 101 #define L2DISIZE 9 /* log2(DISIZE) */ 102 103 #define IDATASIZE 256 /* inode inline data size */ 104 #define IXATTRSIZE 128 /* inode inline extended attribute size */ 105 106 #define XTPAGE_SIZE 4096 107 #define log2_PAGESIZE 12 108 109 #define IAG_SIZE 4096 110 #define IAG_EXTENT_SIZE 4096 111 #define INOSPERIAG 4096 /* number of disk inodes per iag */ 112 #define L2INOSPERIAG 12 /* l2 number of disk inodes per iag */ 113 #define INOSPEREXT 32 /* number of disk inode per extent */ 114 #define L2INOSPEREXT 5 /* l2 number of disk inode per extent */ 115 #define IXSIZE (DISIZE * INOSPEREXT) /* inode extent size */ 116 #define INOSPERPAGE 8 /* number of disk inodes per 4K page */ 117 #define L2INOSPERPAGE 3 /* log2(INOSPERPAGE) */ 118 119 #define IAGFREELIST_LWM 64 120 121 #define INODE_EXTENT_SIZE IXSIZE /* inode extent size */ 122 #define NUM_INODE_PER_EXTENT INOSPEREXT 123 #define NUM_INODE_PER_IAG INOSPERIAG 124 125 #define MINBLOCKSIZE 512 126 #define L2MINBLOCKSIZE 9 127 #define MAXBLOCKSIZE 4096 128 #define L2MAXBLOCKSIZE 12 129 #define MAXFILESIZE ((s64)1 << 52) 130 131 #define JFS_LINK_MAX 0xffffffff 132 133 /* Minimum number of bytes supported for a JFS partition */ 134 #define MINJFS (0x1000000) 135 #define MINJFSTEXT "16" 136 137 /* 138 * file system block size -> physical block size 139 */ 140 #define LBOFFSET(x) ((x) & (PBSIZE - 1)) 141 #define LBNUMBER(x) ((x) >> L2PBSIZE) 142 #define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE)) 143 #define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE)) 144 /* size in byte -> last page number */ 145 #define SIZE2PN(size) ( ((s64)((size) - 1)) >> (L2PSIZE) ) 146 /* size in byte -> last file system block number */ 147 #define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) ) 148 149 /* 150 * fixed physical block address (physical block size = 512 byte) 151 * 152 * NOTE: since we can't guarantee a physical block size of 512 bytes the use of 153 * these macros should be removed and the byte offset macros used instead. 154 */ 155 #define SUPER1_B 64 /* primary superblock */ 156 #define AIMAP_B (SUPER1_B + 8) /* 1st extent of aggregate inode map */ 157 #define AITBL_B (AIMAP_B + 16) /* 158 * 1st extent of aggregate inode table 159 */ 160 #define SUPER2_B (AITBL_B + 32) /* 2ndary superblock pbn */ 161 #define BMAP_B (SUPER2_B + 8) /* block allocation map */ 162 163 /* 164 * SIZE_OF_SUPER defines the total amount of space reserved on disk for the 165 * superblock. This is not the same as the superblock structure, since all of 166 * this space is not currently being used. 167 */ 168 #define SIZE_OF_SUPER PSIZE 169 170 /* 171 * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table 172 */ 173 #define SIZE_OF_AG_TABLE PSIZE 174 175 /* 176 * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of 177 * the inode allocation map (to hold iag) 178 */ 179 #define SIZE_OF_MAP_PAGE PSIZE 180 181 /* 182 * fixed byte offset address 183 */ 184 #define SUPER1_OFF 0x8000 /* primary superblock */ 185 #define AIMAP_OFF (SUPER1_OFF + SIZE_OF_SUPER) 186 /* 187 * Control page of aggregate inode map 188 * followed by 1st extent of map 189 */ 190 #define AITBL_OFF (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1)) 191 /* 192 * 1st extent of aggregate inode table 193 */ 194 #define SUPER2_OFF (AITBL_OFF + INODE_EXTENT_SIZE) 195 /* 196 * secondary superblock 197 */ 198 #define BMAP_OFF (SUPER2_OFF + SIZE_OF_SUPER) 199 /* 200 * block allocation map 201 */ 202 203 /* 204 * The following macro is used to indicate the number of reserved disk blocks at 205 * the front of an aggregate, in terms of physical blocks. This value is 206 * currently defined to be 32K. This turns out to be the same as the primary 207 * superblock's address, since it directly follows the reserved blocks. 208 */ 209 #define AGGR_RSVD_BLOCKS SUPER1_B 210 211 /* 212 * The following macro is used to indicate the number of reserved bytes at the 213 * front of an aggregate. This value is currently defined to be 32K. This 214 * turns out to be the same as the primary superblock's byte offset, since it 215 * directly follows the reserved blocks. 216 */ 217 #define AGGR_RSVD_BYTES SUPER1_OFF 218 219 /* 220 * The following macro defines the byte offset for the first inode extent in 221 * the aggregate inode table. This allows us to find the self inode to find the 222 * rest of the table. Currently this value is 44K. 223 */ 224 #define AGGR_INODE_TABLE_START AITBL_OFF 225 226 /* 227 * fixed reserved inode number 228 */ 229 /* aggregate inode */ 230 #define AGGR_RESERVED_I 0 /* aggregate inode (reserved) */ 231 #define AGGREGATE_I 1 /* aggregate inode map inode */ 232 #define BMAP_I 2 /* aggregate block allocation map inode */ 233 #define LOG_I 3 /* aggregate inline log inode */ 234 #define BADBLOCK_I 4 /* aggregate bad block inode */ 235 #define FILESYSTEM_I 16 /* 1st/only fileset inode in ait: 236 * fileset inode map inode 237 */ 238 239 /* per fileset inode */ 240 #define FILESET_RSVD_I 0 /* fileset inode (reserved) */ 241 #define FILESET_EXT_I 1 /* fileset inode extension */ 242 #define ROOT_I 2 /* fileset root inode */ 243 #define ACL_I 3 /* fileset ACL inode */ 244 245 #define FILESET_OBJECT_I 4 /* the first fileset inode available for a file 246 * or directory or link... 247 */ 248 #define FIRST_FILESET_INO 16 /* the first aggregate inode which describes 249 * an inode. (To fsck this is also the first 250 * inode in part 2 of the agg inode table.) 251 */ 252 253 /* 254 * directory configuration 255 */ 256 #define JFS_NAME_MAX 255 257 #define JFS_PATH_MAX BPSIZE 258 259 260 /* 261 * file system state (superblock state) 262 */ 263 #define FM_CLEAN 0x00000000 /* file system is unmounted and clean */ 264 #define FM_MOUNT 0x00000001 /* file system is mounted cleanly */ 265 #define FM_DIRTY 0x00000002 /* file system was not unmounted and clean 266 * when mounted or 267 * commit failure occurred while being mounted: 268 * fsck() must be run to repair 269 */ 270 #define FM_LOGREDO 0x00000004 /* log based recovery (logredo()) failed: 271 * fsck() must be run to repair 272 */ 273 #define FM_EXTENDFS 0x00000008 /* file system extendfs() in progress */ 274 #define FM_STATE_MAX 0x0000000f /* max value of s_state */ 275 276 #endif /* _H_JFS_FILSYS */ 277