| /* |
| * Copyright (C) International Business Machines Corp., 2000-2003 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #ifndef _H_JFS_FILSYS |
| #define _H_JFS_FILSYS |
| |
| /* |
| * jfs_filsys.h |
| * |
| * file system (implementation-dependent) constants |
| * |
| * refer to <limits.h> for system wide implementation-dependent constants |
| */ |
| |
| /* |
| * file system option (superblock flag) |
| */ |
| |
| /* directory option */ |
| #define JFS_UNICODE 0x00000001 /* unicode name */ |
| |
| /* mount time flags for error handling */ |
| #define JFS_ERR_REMOUNT_RO 0x00000002 /* remount read-only */ |
| #define JFS_ERR_CONTINUE 0x00000004 /* continue */ |
| #define JFS_ERR_PANIC 0x00000008 /* panic */ |
| |
| /* Quota support */ |
| #define JFS_USRQUOTA 0x00000010 |
| #define JFS_GRPQUOTA 0x00000020 |
| |
| /* mount time flag to disable journaling to disk */ |
| #define JFS_NOINTEGRITY 0x00000040 |
| |
| /* mount time flag to enable TRIM to ssd disks */ |
| #define JFS_DISCARD 0x00000080 |
| |
| /* commit option */ |
| #define JFS_COMMIT 0x00000f00 /* commit option mask */ |
| #define JFS_GROUPCOMMIT 0x00000100 /* group (of 1) commit */ |
| #define JFS_LAZYCOMMIT 0x00000200 /* lazy commit */ |
| #define JFS_TMPFS 0x00000400 /* temporary file system - |
| * do not log/commit: |
| * Never implemented |
| */ |
| |
| /* log logical volume option */ |
| #define JFS_INLINELOG 0x00000800 /* inline log within file system */ |
| #define JFS_INLINEMOVE 0x00001000 /* inline log being moved */ |
| |
| /* Secondary aggregate inode table */ |
| #define JFS_BAD_SAIT 0x00010000 /* current secondary ait is bad */ |
| |
| /* sparse regular file support */ |
| #define JFS_SPARSE 0x00020000 /* sparse regular file */ |
| |
| /* DASD Limits F226941 */ |
| #define JFS_DASD_ENABLED 0x00040000 /* DASD limits enabled */ |
| #define JFS_DASD_PRIME 0x00080000 /* Prime DASD usage on boot */ |
| |
| /* big endian flag */ |
| #define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */ |
| |
| /* Directory index */ |
| #define JFS_DIR_INDEX 0x00200000 /* Persistent index for */ |
| |
| /* platform options */ |
| #define JFS_LINUX 0x10000000 /* Linux support */ |
| #define JFS_DFS 0x20000000 /* DCE DFS LFS support */ |
| /* Never implemented */ |
| |
| #define JFS_OS2 0x40000000 /* OS/2 support */ |
| /* case-insensitive name/directory support */ |
| |
| #define JFS_AIX 0x80000000 /* AIX support */ |
| |
| /* |
| * buffer cache configuration |
| */ |
| /* page size */ |
| #ifdef PSIZE |
| #undef PSIZE |
| #endif |
| #define PSIZE 4096 /* page size (in byte) */ |
| #define L2PSIZE 12 /* log2(PSIZE) */ |
| #define POFFSET 4095 /* offset within page */ |
| |
| /* buffer page size */ |
| #define BPSIZE PSIZE |
| |
| /* |
| * fs fundamental size |
| * |
| * PSIZE >= file system block size >= PBSIZE >= DISIZE |
| */ |
| #define PBSIZE 512 /* physical block size (in byte) */ |
| #define L2PBSIZE 9 /* log2(PBSIZE) */ |
| |
| #define DISIZE 512 /* on-disk inode size (in byte) */ |
| #define L2DISIZE 9 /* log2(DISIZE) */ |
| |
| #define IDATASIZE 256 /* inode inline data size */ |
| #define IXATTRSIZE 128 /* inode inline extended attribute size */ |
| |
| #define XTPAGE_SIZE 4096 |
| #define log2_PAGESIZE 12 |
| |
| #define IAG_SIZE 4096 |
| #define IAG_EXTENT_SIZE 4096 |
| #define INOSPERIAG 4096 /* number of disk inodes per iag */ |
| #define L2INOSPERIAG 12 /* l2 number of disk inodes per iag */ |
| #define INOSPEREXT 32 /* number of disk inode per extent */ |
| #define L2INOSPEREXT 5 /* l2 number of disk inode per extent */ |
| #define IXSIZE (DISIZE * INOSPEREXT) /* inode extent size */ |
| #define INOSPERPAGE 8 /* number of disk inodes per 4K page */ |
| #define L2INOSPERPAGE 3 /* log2(INOSPERPAGE) */ |
| |
| #define IAGFREELIST_LWM 64 |
| |
| #define INODE_EXTENT_SIZE IXSIZE /* inode extent size */ |
| #define NUM_INODE_PER_EXTENT INOSPEREXT |
| #define NUM_INODE_PER_IAG INOSPERIAG |
| |
| #define MINBLOCKSIZE 512 |
| #define MAXBLOCKSIZE 4096 |
| #define MAXFILESIZE ((s64)1 << 52) |
| |
| #define JFS_LINK_MAX 0xffffffff |
| |
| /* Minimum number of bytes supported for a JFS partition */ |
| #define MINJFS (0x1000000) |
| #define MINJFSTEXT "16" |
| |
| /* |
| * file system block size -> physical block size |
| */ |
| #define LBOFFSET(x) ((x) & (PBSIZE - 1)) |
| #define LBNUMBER(x) ((x) >> L2PBSIZE) |
| #define LBLK2PBLK(sb,b) ((b) << (sb->s_blocksize_bits - L2PBSIZE)) |
| #define PBLK2LBLK(sb,b) ((b) >> (sb->s_blocksize_bits - L2PBSIZE)) |
| /* size in byte -> last page number */ |
| #define SIZE2PN(size) ( ((s64)((size) - 1)) >> (L2PSIZE) ) |
| /* size in byte -> last file system block number */ |
| #define SIZE2BN(size, l2bsize) ( ((s64)((size) - 1)) >> (l2bsize) ) |
| |
| /* |
| * fixed physical block address (physical block size = 512 byte) |
| * |
| * NOTE: since we can't guarantee a physical block size of 512 bytes the use of |
| * these macros should be removed and the byte offset macros used instead. |
| */ |
| #define SUPER1_B 64 /* primary superblock */ |
| #define AIMAP_B (SUPER1_B + 8) /* 1st extent of aggregate inode map */ |
| #define AITBL_B (AIMAP_B + 16) /* |
| * 1st extent of aggregate inode table |
| */ |
| #define SUPER2_B (AITBL_B + 32) /* 2ndary superblock pbn */ |
| #define BMAP_B (SUPER2_B + 8) /* block allocation map */ |
| |
| /* |
| * SIZE_OF_SUPER defines the total amount of space reserved on disk for the |
| * superblock. This is not the same as the superblock structure, since all of |
| * this space is not currently being used. |
| */ |
| #define SIZE_OF_SUPER PSIZE |
| |
| /* |
| * SIZE_OF_AG_TABLE defines the amount of space reserved to hold the AG table |
| */ |
| #define SIZE_OF_AG_TABLE PSIZE |
| |
| /* |
| * SIZE_OF_MAP_PAGE defines the amount of disk space reserved for each page of |
| * the inode allocation map (to hold iag) |
| */ |
| #define SIZE_OF_MAP_PAGE PSIZE |
| |
| /* |
| * fixed byte offset address |
| */ |
| #define SUPER1_OFF 0x8000 /* primary superblock */ |
| #define AIMAP_OFF (SUPER1_OFF + SIZE_OF_SUPER) |
| /* |
| * Control page of aggregate inode map |
| * followed by 1st extent of map |
| */ |
| #define AITBL_OFF (AIMAP_OFF + (SIZE_OF_MAP_PAGE << 1)) |
| /* |
| * 1st extent of aggregate inode table |
| */ |
| #define SUPER2_OFF (AITBL_OFF + INODE_EXTENT_SIZE) |
| /* |
| * secondary superblock |
| */ |
| #define BMAP_OFF (SUPER2_OFF + SIZE_OF_SUPER) |
| /* |
| * block allocation map |
| */ |
| |
| /* |
| * The following macro is used to indicate the number of reserved disk blocks at |
| * the front of an aggregate, in terms of physical blocks. This value is |
| * currently defined to be 32K. This turns out to be the same as the primary |
| * superblock's address, since it directly follows the reserved blocks. |
| */ |
| #define AGGR_RSVD_BLOCKS SUPER1_B |
| |
| /* |
| * The following macro is used to indicate the number of reserved bytes at the |
| * front of an aggregate. This value is currently defined to be 32K. This |
| * turns out to be the same as the primary superblock's byte offset, since it |
| * directly follows the reserved blocks. |
| */ |
| #define AGGR_RSVD_BYTES SUPER1_OFF |
| |
| /* |
| * The following macro defines the byte offset for the first inode extent in |
| * the aggregate inode table. This allows us to find the self inode to find the |
| * rest of the table. Currently this value is 44K. |
| */ |
| #define AGGR_INODE_TABLE_START AITBL_OFF |
| |
| /* |
| * fixed reserved inode number |
| */ |
| /* aggregate inode */ |
| #define AGGR_RESERVED_I 0 /* aggregate inode (reserved) */ |
| #define AGGREGATE_I 1 /* aggregate inode map inode */ |
| #define BMAP_I 2 /* aggregate block allocation map inode */ |
| #define LOG_I 3 /* aggregate inline log inode */ |
| #define BADBLOCK_I 4 /* aggregate bad block inode */ |
| #define FILESYSTEM_I 16 /* 1st/only fileset inode in ait: |
| * fileset inode map inode |
| */ |
| |
| /* per fileset inode */ |
| #define FILESET_RSVD_I 0 /* fileset inode (reserved) */ |
| #define FILESET_EXT_I 1 /* fileset inode extension */ |
| #define ROOT_I 2 /* fileset root inode */ |
| #define ACL_I 3 /* fileset ACL inode */ |
| |
| #define FILESET_OBJECT_I 4 /* the first fileset inode available for a file |
| * or directory or link... |
| */ |
| #define FIRST_FILESET_INO 16 /* the first aggregate inode which describes |
| * an inode. (To fsck this is also the first |
| * inode in part 2 of the agg inode table.) |
| */ |
| |
| /* |
| * directory configuration |
| */ |
| #define JFS_NAME_MAX 255 |
| #define JFS_PATH_MAX BPSIZE |
| |
| |
| /* |
| * file system state (superblock state) |
| */ |
| #define FM_CLEAN 0x00000000 /* file system is unmounted and clean */ |
| #define FM_MOUNT 0x00000001 /* file system is mounted cleanly */ |
| #define FM_DIRTY 0x00000002 /* file system was not unmounted and clean |
| * when mounted or |
| * commit failure occurred while being mounted: |
| * fsck() must be run to repair |
| */ |
| #define FM_LOGREDO 0x00000004 /* log based recovery (logredo()) failed: |
| * fsck() must be run to repair |
| */ |
| #define FM_EXTENDFS 0x00000008 /* file system extendfs() in progress */ |
| #define FM_STATE_MAX 0x0000000f /* max value of s_state */ |
| |
| #endif /* _H_JFS_FILSYS */ |