Release 4.10 fs/jfs/jfs_filsys.h
/*
* 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 */
#endif /* _H_JFS_FILSYS */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| dave kleikamp | dave kleikamp | 514 | 97.35% | 6 | 66.67% |
| mark bellon | mark bellon | 8 | 1.52% | 1 | 11.11% |
| tino reichardt | tino reichardt | 5 | 0.95% | 1 | 11.11% |
| jan engelhardt | jan engelhardt | 1 | 0.19% | 1 | 11.11% |
| Total | 528 | 100.00% | 9 | 100.00% |
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