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