1 files changed, 280 insertions, 0 deletions

diff --git a/fs/jfs/jfs_filsys.h b/fs/jfs/jfs_filsys.h
new file mode 100644
index 000000000000..86ccac80f0ab
--- /dev/null
+++ b/fs/jfs/jfs_filsys.h
@@ -0,0 +1,280 @@
+/*
+ *   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)
+ */
+/* mount time flag to disable journaling to disk */
+#define JFS_NOINTEGRITY 0x00000010
+
+/* 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 */
+
+/* platform option (conditional compilation) */
+#define JFS_AIX         0x80000000      /* AIX support */
+/*      POSIX name/directory  support */
+
+#define JFS_OS2         0x40000000      /* OS/2 support */
+/*      case-insensitive name/directory support */
+
+#define JFS_DFS         0x20000000      /* DCE DFS LFS support */
+
+#define JFS_LINUX       0x10000000      /* Linux support */
+/*      case-sensitive name/directory support */
+
+/* directory option */
+#define JFS_UNICODE     0x00000001      /* unicode name */
+
+/* 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:
+                                         */
+
+/* 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      /* Persistant index for */
+                                                /* directory entries    */
+
+
+/*
+ *      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 */