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+/*
+ * 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 */