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+/* jfs.h - an extractions from linux/include/linux/jfs/jfs* into one file */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2000 International Business Machines Corp.
+ * Copyright (C) 2001 Free Software Foundation, Inc.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#ifndef _JFS_H_
+#define _JFS_H_
+
+/* those are from jfs_filsys.h */
+
+/*
+ * file system option (superblock flag)
+ */
+/* 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_LINUX 0x10000000 /* Linux support */
+/* case-sensitive name/directory support */
+
+/* directory option */
+#define JFS_UNICODE 0x00000001 /* unicode name */
+
+/* bba */
+#define JFS_SWAP_BYTES 0x00100000 /* running on big endian computer */
+
+
+/*
+ * buffer cache configuration
+ */
+/* page size */
+#ifdef PSIZE
+#undef PSIZE
+#endif
+#define PSIZE 4096 /* page size (in byte) */
+
+/*
+ * fs fundamental size
+ *
+ * PSIZE >= file system block size >= PBSIZE >= DISIZE
+ */
+#define PBSIZE 512 /* physical block size (in byte) */
+#define DISIZE 512 /* on-disk inode size (in byte) */
+#define L2DISIZE 9
+#define INOSPERIAG 4096 /* number of disk inodes per iag */
+#define L2INOSPERIAG 12
+#define INOSPEREXT 32 /* number of disk inode per extent */
+#define L2INOSPEREXT 5
+
+/* Minimum number of bytes supported for a JFS partition */
+#define MINJFS (0x1000000)
+
+/*
+ * fixed byte offset address
+ */
+#define SUPER1_OFF 0x8000 /* primary superblock */
+
+#define AITBL_OFF (SUPER1_OFF + PSIZE + (PSIZE << 1))
+
+/*
+ * fixed reserved inode number
+ */
+/* aggregate inode */
+#define AGGREGATE_I 1 /* aggregate inode map inode */
+#define FILESYSTEM_I 16 /* 1st/only fileset inode in ait:
+ * fileset inode map inode
+ */
+
+/* per fileset inode */
+#define ROOT_I 2 /* fileset root inode */
+
+/*
+ * directory configuration
+ */
+#define JFS_NAME_MAX 255
+#define JFS_PATH_MAX PSIZE
+
+#if 0
+typedef unsigned char u8;
+typedef char s8;
+typedef unsigned short u16;
+typedef short s16;
+typedef unsigned int u32;
+typedef int s32;
+typedef unsigned long long u64;
+typedef long long s64;
+#endif
+
+typedef u16 UniChar;
+
+/* these from jfs_btree.h */
+
+/* btpaget_t flag */
+#define BT_TYPE 0x07 /* B+-tree index */
+#define BT_ROOT 0x01 /* root page */
+#define BT_LEAF 0x02 /* leaf page */
+#define BT_INTERNAL 0x04 /* internal page */
+#define BT_RIGHTMOST 0x10 /* rightmost page */
+#define BT_LEFTMOST 0x20 /* leftmost page */
+
+/* those are from jfs_types.h */
+
+struct timestruc_t {
+ u32 tv_sec;
+ u32 tv_nsec;
+};
+
+/*
+ * physical xd (pxd)
+ */
+typedef struct {
+ unsigned len:24;
+ unsigned addr1:8;
+ u32 addr2;
+} pxd_t;
+
+/* xd_t field extraction */
+#define lengthPXD(pxd) ((pxd)->len)
+#define addressPXD(pxd) (((s64)((pxd)->addr1)) << 32 | ((pxd)->addr2))
+
+/*
+ * data extent descriptor (dxd)
+ */
+typedef struct {
+ unsigned flag:8; /* 1: flags */
+ unsigned rsrvd:24; /* 3: */
+ u32 size; /* 4: size in byte */
+ unsigned len:24; /* 3: length in unit of fsblksize */
+ unsigned addr1:8; /* 1: address in unit of fsblksize */
+ u32 addr2; /* 4: address in unit of fsblksize */
+} dxd_t; /* - 16 - */
+
+/*
+ * DASD limit information - stored in directory inode
+ */
+typedef struct dasd {
+ u8 thresh; /* Alert Threshold (in percent) */
+ u8 delta; /* Alert Threshold delta (in percent) */
+ u8 rsrvd1;
+ u8 limit_hi; /* DASD limit (in logical blocks) */
+ u32 limit_lo; /* DASD limit (in logical blocks) */
+ u8 rsrvd2[3];
+ u8 used_hi; /* DASD usage (in logical blocks) */
+ u32 used_lo; /* DASD usage (in logical blocks) */
+} dasd_t;
+
+
+/* from jfs_superblock.h */
+
+#define JFS_MAGIC 0x3153464A /* "JFS1" */
+
+struct jfs_superblock
+{
+ u32 s_magic; /* 4: magic number */
+ u32 s_version; /* 4: version number */
+
+ s64 s_size; /* 8: aggregate size in hardware/LVM blocks;
+ * VFS: number of blocks
+ */
+ s32 s_bsize; /* 4: aggregate block size in bytes;
+ * VFS: fragment size
+ */
+ s16 s_l2bsize; /* 2: log2 of s_bsize */
+ s16 s_l2bfactor; /* 2: log2(s_bsize/hardware block size) */
+ s32 s_pbsize; /* 4: hardware/LVM block size in bytes */
+ s16 s_l2pbsize; /* 2: log2 of s_pbsize */
+ s16 pad; /* 2: padding necessary for alignment */
+
+ u32 s_agsize; /* 4: allocation group size in aggr. blocks */
+
+ u32 s_flag; /* 4: aggregate attributes:
+ * see jfs_filsys.h
+ */
+ u32 s_state; /* 4: mount/unmount/recovery state:
+ * see jfs_filsys.h
+ */
+ s32 s_compress; /* 4: > 0 if data compression */
+
+ pxd_t s_ait2; /* 8: first extent of secondary
+ * aggregate inode table
+ */
+
+ pxd_t s_aim2; /* 8: first extent of secondary
+ * aggregate inode map
+ */
+ u32 s_logdev; /* 4: device address of log */
+ s32 s_logserial; /* 4: log serial number at aggregate mount */
+ pxd_t s_logpxd; /* 8: inline log extent */
+
+ pxd_t s_fsckpxd; /* 8: inline fsck work space extent */
+
+ struct timestruc_t s_time; /* 8: time last updated */
+
+ s32 s_fsckloglen; /* 4: Number of filesystem blocks reserved for
+ * the fsck service log.
+ * N.B. These blocks are divided among the
+ * versions kept. This is not a per
+ * version size.
+ * N.B. These blocks are included in the
+ * length field of s_fsckpxd.
+ */
+ s8 s_fscklog; /* 1: which fsck service log is most recent
+ * 0 => no service log data yet
+ * 1 => the first one
+ * 2 => the 2nd one
+ */
+ char s_fpack[11]; /* 11: file system volume name
+ * N.B. This must be 11 bytes to
+ * conform with the OS/2 BootSector
+ * requirements
+ */
+
+ /* extendfs() parameter under s_state & FM_EXTENDFS */
+ s64 s_xsize; /* 8: extendfs s_size */
+ pxd_t s_xfsckpxd; /* 8: extendfs fsckpxd */
+ pxd_t s_xlogpxd; /* 8: extendfs logpxd */
+ /* - 128 byte boundary - */
+
+ /*
+ * DFS VFS support (preliminary)
+ */
+ char s_attach; /* 1: VFS: flag: set when aggregate is attached
+ */
+ u8 rsrvd4[7]; /* 7: reserved - set to 0 */
+
+ u64 totalUsable; /* 8: VFS: total of 1K blocks which are
+ * available to "normal" (non-root) users.
+ */
+ u64 minFree; /* 8: VFS: # of 1K blocks held in reserve for
+ * exclusive use of root. This value can be 0,
+ * and if it is then totalUsable will be equal
+ * to # of blocks in aggregate. I believe this
+ * means that minFree + totalUsable = # blocks.
+ * In that case, we don't need to store both
+ * totalUsable and minFree since we can compute
+ * one from the other. I would guess minFree
+ * would be the one we should store, and
+ * totalUsable would be the one we should
+ * compute. (Just a guess...)
+ */
+
+ u64 realFree; /* 8: VFS: # of free 1K blocks can be used by
+ * "normal" users. It may be this is something
+ * we should compute when asked for instead of
+ * storing in the superblock. I don't know how
+ * often this information is needed.
+ */
+ /*
+ * graffiti area
+ */
+};
+
+/* from jfs_dtree.h */
+
+/*
+ * entry segment/slot
+ *
+ * an entry consists of type dependent head/only segment/slot and
+ * additional segments/slots linked vi next field;
+ * N.B. last/only segment of entry is terminated by next = -1;
+ */
+/*
+ * directory page slot
+ */
+typedef struct {
+ s8 next; /* 1: */
+ s8 cnt; /* 1: */
+ UniChar name[15]; /* 30: */
+} dtslot_t; /* (32) */
+
+#define DTSLOTDATALEN 15
+
+/*
+ * internal node entry head/only segment
+ */
+typedef struct {
+ pxd_t xd; /* 8: child extent descriptor */
+
+ s8 next; /* 1: */
+ u8 namlen; /* 1: */
+ UniChar name[11]; /* 22: 2-byte aligned */
+} idtentry_t; /* (32) */
+
+/*
+ * leaf node entry head/only segment
+ *
+ * For legacy filesystems, name contains 13 unichars -- no index field
+ */
+typedef struct {
+ u32 inumber; /* 4: 4-byte aligned */
+ s8 next; /* 1: */
+ u8 namlen; /* 1: */
+ UniChar name[11]; /* 22: 2-byte aligned */
+ u32 index; /* 4: index into dir_table */
+} ldtentry_t; /* (32) */
+
+#define DTLHDRDATALEN 11
+
+/*
+ * dir_table used for directory traversal during readdir
+*/
+
+/*
+ * Maximum entry in inline directory table
+ */
+
+typedef struct dir_table_slot {
+ u8 rsrvd; /* 1: */
+ u8 flag; /* 1: 0 if free */
+ u8 slot; /* 1: slot within leaf page of entry */
+ u8 addr1; /* 1: upper 8 bits of leaf page address */
+ u32 addr2; /* 4: lower 32 bits of leaf page address -OR-
+ index of next entry when this entry was deleted */
+} dir_table_slot_t; /* (8) */
+
+/*
+ * directory root page (in-line in on-disk inode):
+ *
+ * cf. dtpage_t below.
+ */
+typedef union {
+ struct {
+ dasd_t DASD; /* 16: DASD limit/usage info F226941 */
+
+ u8 flag; /* 1: */
+ s8 nextindex; /* 1: next free entry in stbl */
+ s8 freecnt; /* 1: free count */
+ s8 freelist; /* 1: freelist header */
+
+ u32 idotdot; /* 4: parent inode number */
+
+ s8 stbl[8]; /* 8: sorted entry index table */
+ } header; /* (32) */
+
+ dtslot_t slot[9];
+} dtroot_t;
+
+/*
+ * directory regular page:
+ *
+ * entry slot array of 32 byte slot
+ *
+ * sorted entry slot index table (stbl):
+ * contiguous slots at slot specified by stblindex,
+ * 1-byte per entry
+ * 512 byte block: 16 entry tbl (1 slot)
+ * 1024 byte block: 32 entry tbl (1 slot)
+ * 2048 byte block: 64 entry tbl (2 slot)
+ * 4096 byte block: 128 entry tbl (4 slot)
+ *
+ * data area:
+ * 512 byte block: 16 - 2 = 14 slot
+ * 1024 byte block: 32 - 2 = 30 slot
+ * 2048 byte block: 64 - 3 = 61 slot
+ * 4096 byte block: 128 - 5 = 123 slot
+ *
+ * N.B. index is 0-based; index fields refer to slot index
+ * except nextindex which refers to entry index in stbl;
+ * end of entry stot list or freelist is marked with -1.
+ */
+typedef union {
+ struct {
+ s64 next; /* 8: next sibling */
+ s64 prev; /* 8: previous sibling */
+
+ u8 flag; /* 1: */
+ s8 nextindex; /* 1: next entry index in stbl */
+ s8 freecnt; /* 1: */
+ s8 freelist; /* 1: slot index of head of freelist */
+
+ u8 maxslot; /* 1: number of slots in page slot[] */
+ s8 stblindex; /* 1: slot index of start of stbl */
+ u8 rsrvd[2]; /* 2: */
+
+ pxd_t self; /* 8: self pxd */
+ } header; /* (32) */
+
+ dtslot_t slot[128];
+} dtpage_t;
+
+/* from jfs_xtree.h */
+
+/*
+ * extent allocation descriptor (xad)
+ */
+typedef struct xad {
+ unsigned flag:8; /* 1: flag */
+ unsigned rsvrd:16; /* 2: reserved */
+ unsigned off1:8; /* 1: offset in unit of fsblksize */
+ u32 off2; /* 4: offset in unit of fsblksize */
+ unsigned len:24; /* 3: length in unit of fsblksize */
+ unsigned addr1:8; /* 1: address in unit of fsblksize */
+ u32 addr2; /* 4: address in unit of fsblksize */
+} xad_t; /* (16) */
+
+/* xad_t field extraction */
+#define offsetXAD(xad) (((s64)((xad)->off1)) << 32 | ((xad)->off2))
+#define addressXAD(xad) (((s64)((xad)->addr1)) << 32 | ((xad)->addr2))
+#define lengthXAD(xad) ((xad)->len)
+
+/* possible values for maxentry */
+#define XTPAGEMAXSLOT 256
+#define XTENTRYSTART 2
+
+/*
+ * xtree page:
+ */
+typedef union {
+ struct xtheader {
+ s64 next; /* 8: */
+ s64 prev; /* 8: */
+
+ u8 flag; /* 1: */
+ u8 rsrvd1; /* 1: */
+ s16 nextindex; /* 2: next index = number of entries */
+ s16 maxentry; /* 2: max number of entries */
+ s16 rsrvd2; /* 2: */
+
+ pxd_t self; /* 8: self */
+ } header; /* (32) */
+
+ xad_t xad[XTPAGEMAXSLOT]; /* 16 * maxentry: xad array */
+} xtpage_t;
+
+/* from jfs_dinode.h */
+
+struct dinode {
+ /*
+ * I. base area (128 bytes)
+ * ------------------------
+ *
+ * define generic/POSIX attributes
+ */
+ u32 di_inostamp; /* 4: stamp to show inode belongs to fileset */
+ s32 di_fileset; /* 4: fileset number */
+ u32 di_number; /* 4: inode number, aka file serial number */
+ u32 di_gen; /* 4: inode generation number */
+
+ pxd_t di_ixpxd; /* 8: inode extent descriptor */
+
+ s64 di_size; /* 8: size */
+ s64 di_nblocks; /* 8: number of blocks allocated */
+
+ u32 di_nlink; /* 4: number of links to the object */
+
+ u32 di_uid; /* 4: user id of owner */
+ u32 di_gid; /* 4: group id of owner */
+
+ u32 di_mode; /* 4: attribute, format and permission */
+
+ struct timestruc_t di_atime; /* 8: time last data accessed */
+ struct timestruc_t di_ctime; /* 8: time last status changed */
+ struct timestruc_t di_mtime; /* 8: time last data modified */
+ struct timestruc_t di_otime; /* 8: time created */
+
+ dxd_t di_acl; /* 16: acl descriptor */
+
+ dxd_t di_ea; /* 16: ea descriptor */
+
+ s32 di_next_index; /* 4: Next available dir_table index */
+
+ s32 di_acltype; /* 4: Type of ACL */
+
+ /*
+ * Extension Areas.
+ *
+ * Historically, the inode was partitioned into 4 128-byte areas,
+ * the last 3 being defined as unions which could have multiple
+ * uses. The first 96 bytes had been completely unused until
+ * an index table was added to the directory. It is now more
+ * useful to describe the last 3/4 of the inode as a single
+ * union. We would probably be better off redesigning the
+ * entire structure from scratch, but we don't want to break
+ * commonality with OS/2's JFS at this time.
+ */
+ union {
+ struct {
+ /*
+ * This table contains the information needed to
+ * find a directory entry from a 32-bit index.
+ * If the index is small enough, the table is inline,
+ * otherwise, an x-tree root overlays this table
+ */
+ dir_table_slot_t _table[12]; /* 96: inline */
+
+ dtroot_t _dtroot; /* 288: dtree root */
+ } _dir; /* (384) */
+#define di_dirtable u._dir._table
+#define di_dtroot u._dir._dtroot
+#define di_parent di_dtroot.header.idotdot
+#define di_DASD di_dtroot.header.DASD
+
+ struct {
+ union {
+ u8 _data[96]; /* 96: unused */
+ struct {
+ void *_imap; /* 4: unused */
+ u32 _gengen; /* 4: generator */
+ } _imap;
+ } _u1; /* 96: */
+#define di_gengen u._file._u1._imap._gengen
+
+ union {
+ xtpage_t _xtroot;
+ struct {
+ u8 unused[16]; /* 16: */
+ dxd_t _dxd; /* 16: */
+ union {
+ u32 _rdev; /* 4: */
+ u8 _fastsymlink[128];
+ } _u;
+ u8 _inlineea[128];
+ } _special;
+ } _u2;
+ } _file;
+#define di_xtroot u._file._u2._xtroot
+#define di_dxd u._file._u2._special._dxd
+#define di_btroot di_xtroot
+#define di_inlinedata u._file._u2._special._u
+#define di_rdev u._file._u2._special._u._rdev
+#define di_fastsymlink u._file._u2._special._u._fastsymlink
+#define di_inlineea u._file._u2._special._inlineea
+ } u;
+};
+
+typedef struct dinode dinode_t;
+
+/* di_mode */
+#define IFMT 0xF000 /* S_IFMT - mask of file type */
+#define IFDIR 0x4000 /* S_IFDIR - directory */
+#define IFREG 0x8000 /* S_IFREG - regular file */
+#define IFLNK 0xA000 /* S_IFLNK - symbolic link */
+
+/* extended mode bits (on-disk inode di_mode) */
+#define INLINEEA 0x00040000 /* inline EA area free */
+
+/* from jfs_imap.h */
+
+#define EXTSPERIAG 128 /* number of disk inode extent per iag */
+#define SMAPSZ 4 /* number of words per summary map */
+#define MAXAG 128 /* maximum number of allocation groups */
+
+/*
+ * inode allocation map:
+ *
+ * inode allocation map consists of
+ * . the inode map control page and
+ * . inode allocation group pages (per 4096 inodes)
+ * which are addressed by standard JFS xtree.
+ */
+/*
+ * inode allocation group page (per 4096 inodes of an AG)
+ */
+typedef struct {
+ s64 agstart; /* 8: starting block of ag */
+ s32 iagnum; /* 4: inode allocation group number */
+ s32 inofreefwd; /* 4: ag inode free list forward */
+ s32 inofreeback; /* 4: ag inode free list back */
+ s32 extfreefwd; /* 4: ag inode extent free list forward */
+ s32 extfreeback; /* 4: ag inode extent free list back */
+ s32 iagfree; /* 4: iag free list */
+
+ /* summary map: 1 bit per inode extent */
+ s32 inosmap[SMAPSZ]; /* 16: sum map of mapwords w/ free inodes;
+ * note: this indicates free and backed
+ * inodes, if the extent is not backed the
+ * value will be 1. if the extent is
+ * backed but all inodes are being used the
+ * value will be 1. if the extent is
+ * backed but at least one of the inodes is
+ * free the value will be 0.
+ */
+ s32 extsmap[SMAPSZ]; /* 16: sum map of mapwords w/ free extents */
+ s32 nfreeinos; /* 4: number of free inodes */
+ s32 nfreeexts; /* 4: number of free extents */
+ /* (72) */
+ u8 pad[1976]; /* 1976: pad to 2048 bytes */
+ /* allocation bit map: 1 bit per inode (0 - free, 1 - allocated) */
+ u32 wmap[EXTSPERIAG]; /* 512: working allocation map */
+ u32 pmap[EXTSPERIAG]; /* 512: persistent allocation map */
+ pxd_t inoext[EXTSPERIAG]; /* 1024: inode extent addresses */
+} iag_t; /* (4096) */
+
+#endif /* _JFS_H_ */