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