stage2/xfs.h

/* xfs.h - an extraction from xfsprogs-1.3.5/include/xfs* into one file */
/* 
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2000  Silicon Graphics, Inc.  All Rights Reserved.
 *  Copyright (C) 2001,2004  Free Software Foundation, Inc.
 * 
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of version 2 of the GNU General Public License as
 *  published by the Free Software Foundation.
 * 
 *  This program is distributed in the hope that it would be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write the Free Software Foundation, Inc., 59
 *  Temple Place - Suite 330, Boston MA 02111-1307, USA.
 * 
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

typedef signed char	xfs_int8_t;
typedef unsigned char	xfs_uint8_t;
typedef short		xfs_int16_t;
typedef unsigned short	xfs_uint16_t;
typedef int		xfs_int32_t;
typedef unsigned int	xfs_uint32_t;
typedef long long	xfs_int64_t;
typedef unsigned long long xfs_uint64_t;

typedef xfs_uint64_t	xfs_ino_t;
typedef	xfs_uint32_t	xfs_agino_t;
typedef xfs_int64_t	xfs_daddr_t;
typedef xfs_int64_t	xfs_off_t;
typedef xfs_uint8_t	uuid_t[16];


/* those are from xfs_types.h */

typedef xfs_uint32_t	xfs_agblock_t;	/* blockno in alloc. group */
typedef	xfs_uint32_t	xfs_extlen_t;	/* extent length in blocks */
typedef	xfs_uint32_t	xfs_agnumber_t;	/* allocation group number */
typedef xfs_int32_t	xfs_extnum_t;	/* # of extents in a file */
typedef xfs_int16_t	xfs_aextnum_t;	/* # extents in an attribute fork */
typedef	xfs_int64_t	xfs_fsize_t;	/* bytes in a file */

typedef	xfs_uint32_t	xfs_dablk_t;	/* dir/attr block number (in file) */
typedef	xfs_uint32_t	xfs_dahash_t;	/* dir/attr hash value */

/*
 * Disk based types:
 */
typedef xfs_uint64_t	xfs_dfsbno_t;	/* blockno in filesystem (agno|agbno) */
typedef xfs_uint64_t	xfs_drfsbno_t;	/* blockno in filesystem (raw) */
typedef	xfs_uint64_t	xfs_drtbno_t;	/* extent (block) in realtime area */
typedef	xfs_uint64_t	xfs_dfiloff_t;	/* block number in a file */

typedef	xfs_uint64_t	xfs_fsblock_t;	/* blockno in filesystem (agno|agbno) */
typedef	xfs_uint64_t	xfs_fileoff_t;	/* block number in a file */
typedef	xfs_uint64_t	xfs_filblks_t;	/* number of blocks in a file */


/* those are from xfs_sb.h */

#define	XFS_SB_MAGIC		0x58465342	/* 'XFSB'*/
#define	XFS_SB_VERSION_4	4		/* 6.2+ - bitmask version */
#define	XFS_SB_VERSION_NUMBITS	0x000f

typedef struct xfs_sb
{
	xfs_uint32_t	sb_magicnum;	/* magic number == XFS_SB_MAGIC */
	xfs_uint32_t	sb_blocksize;	/* logical block size, bytes */
	xfs_drfsbno_t	sb_dblocks;	/* number of data blocks */
	xfs_drfsbno_t	sb_rblocks;	/* number of realtime blocks */
	xfs_drtbno_t	sb_rextents;	/* number of realtime extents */
	uuid_t		sb_uuid;	/* file system unique id */
	xfs_dfsbno_t	sb_logstart;	/* starting block of log if internal */
	xfs_ino_t	sb_rootino;	/* root inode number */
	xfs_ino_t	sb_rbmino;	/* bitmap inode for realtime extents */
	xfs_ino_t	sb_rsumino;	/* summary inode for rt bitmap */
	xfs_agblock_t	sb_rextsize;	/* realtime extent size, blocks */
	xfs_agblock_t	sb_agblocks;	/* size of an allocation group */
	xfs_agnumber_t	sb_agcount;	/* number of allocation groups */
	xfs_extlen_t	sb_rbmblocks;	/* number of rt bitmap blocks */
	xfs_extlen_t	sb_logblocks;	/* number of log blocks */
	xfs_uint16_t	sb_versionnum;	/* header version == XFS_SB_VERSION */
	xfs_uint16_t	sb_sectsize;	/* volume sector size, bytes */
	xfs_uint16_t	sb_inodesize;	/* inode size, bytes */
	xfs_uint16_t	sb_inopblock;	/* inodes per block */
	char		sb_fname[12];	/* file system name */
	xfs_uint8_t	sb_blocklog;	/* log2 of sb_blocksize */
	xfs_uint8_t	sb_sectlog;	/* log2 of sb_sectsize */
	xfs_uint8_t	sb_inodelog;	/* log2 of sb_inodesize */
	xfs_uint8_t	sb_inopblog;	/* log2 of sb_inopblock */
	xfs_uint8_t	sb_agblklog;	/* log2 of sb_agblocks (rounded up) */
	xfs_uint8_t	sb_rextslog;	/* log2 of sb_rextents */
	xfs_uint8_t	sb_inprogress;	/* mkfs is in progress, don't mount */
	xfs_uint8_t	sb_imax_pct;	/* max % of fs for inode space */
					/* statistics */
	/*
	 * These fields must remain contiguous.  If you really
	 * want to change their layout, make sure you fix the
	 * code in xfs_trans_apply_sb_deltas().
	 */
	xfs_uint64_t	sb_icount;	/* allocated inodes */
	xfs_uint64_t	sb_ifree;	/* free inodes */
	xfs_uint64_t	sb_fdblocks;	/* free data blocks */
	xfs_uint64_t	sb_frextents;	/* free realtime extents */
	/*
	 * End contiguous fields.
	 */
	xfs_ino_t	sb_uquotino;	/* user quota inode */
	xfs_ino_t	sb_gquotino;	/* group quota inode */
	xfs_uint16_t	sb_qflags;	/* quota flags */
	xfs_uint8_t	sb_flags;	/* misc. flags */
	xfs_uint8_t	sb_shared_vn;	/* shared version number */
	xfs_extlen_t	sb_inoalignmt;	/* inode chunk alignment, fsblocks */
	xfs_uint32_t	sb_unit;	/* stripe or raid unit */
	xfs_uint32_t	sb_width;	/* stripe or raid width */	
	xfs_uint8_t	sb_dirblklog;	/* log2 of dir block size (fsbs) */
        xfs_uint8_t       sb_dummy[7];    /* padding */
} xfs_sb_t;


/* those are from xfs_btree.h */

/*
 * Long form header: bmap btrees.
 */
typedef struct xfs_btree_lblock
{
	xfs_uint32_t	bb_magic;	/* magic number for block type */
	xfs_uint16_t	bb_level;	/* 0 is a leaf */
	xfs_uint16_t	bb_numrecs;	/* current # of data records */
	xfs_dfsbno_t	bb_leftsib;	/* left sibling block or NULLDFSBNO */
	xfs_dfsbno_t	bb_rightsib;	/* right sibling block or NULLDFSBNO */
} xfs_btree_lblock_t;

/*
 * Combined header and structure, used by common code.
 */
typedef struct xfs_btree_hdr
{
	xfs_uint32_t	bb_magic;	/* magic number for block type */
	xfs_uint16_t	bb_level;	/* 0 is a leaf */
	xfs_uint16_t	bb_numrecs;	/* current # of data records */
} xfs_btree_hdr_t;

typedef struct xfs_btree_block
{
	xfs_btree_hdr_t	bb_h;		/* header */
	union		{
		struct	{
			xfs_agblock_t	bb_leftsib;
			xfs_agblock_t	bb_rightsib;
		}	s;		/* short form pointers */
		struct	{
			xfs_dfsbno_t	bb_leftsib;
			xfs_dfsbno_t	bb_rightsib;
		}	l;		/* long form pointers */
	}		bb_u;		/* rest */
} xfs_btree_block_t;

/* those are from xfs_bmap_btree.h */

/*
 * Bmap root header, on-disk form only.
 */
typedef struct xfs_bmdr_block
{
	xfs_uint16_t	bb_level;	/* 0 is a leaf */
	xfs_uint16_t	bb_numrecs;	/* current # of data records */
} xfs_bmdr_block_t;

/*
 * Bmap btree record and extent descriptor.
 * For 32-bit kernels,
 *  l0:31 is an extent flag (value 1 indicates non-normal).
 *  l0:0-30 and l1:9-31 are startoff.
 *  l1:0-8, l2:0-31, and l3:21-31 are startblock.
 *  l3:0-20 are blockcount.
 * For 64-bit kernels,
 *  l0:63 is an extent flag (value 1 indicates non-normal).
 *  l0:9-62 are startoff.
 *  l0:0-8 and l1:21-63 are startblock.
 *  l1:0-20 are blockcount.
 */

#define	BMBT_USE_64	1

typedef struct xfs_bmbt_rec_32
{
	xfs_uint32_t		l0, l1, l2, l3;
} xfs_bmbt_rec_32_t;
typedef struct xfs_bmbt_rec_64
{
	xfs_uint64_t		l0, l1;
} xfs_bmbt_rec_64_t;

#if BMBT_USE_64
typedef	xfs_uint64_t	xfs_bmbt_rec_base_t;	/* use this for casts */
typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;
#else	/* !BMBT_USE_64 */
typedef	xfs_uint32_t	xfs_bmbt_rec_base_t;	/* use this for casts */
typedef xfs_bmbt_rec_32_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;
#endif	/* BMBT_USE_64 */

/*
 * Key structure for non-leaf levels of the tree.
 */
typedef struct xfs_bmbt_key
{
	xfs_dfiloff_t	br_startoff;	/* starting file offset */
} xfs_bmbt_key_t, xfs_bmdr_key_t;

typedef xfs_dfsbno_t xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;	/* btree pointer type */
					/* btree block header type */
typedef	struct xfs_btree_lblock xfs_bmbt_block_t;


/* those are from xfs_dir2.h */
/*
 * Directory version 2.
 * There are 4 possible formats:
 *	shortform
 *	single block - data with embedded leaf at the end
 *	multiple data blocks, single leaf+freeindex block
 *	data blocks, node&leaf blocks (btree), freeindex blocks
 *
 *	The shortform format is in xfs_dir2_sf.h.
 *	The single block format is in xfs_dir2_block.h.
 *	The data block format is in xfs_dir2_data.h.
 *	The leaf and freeindex block formats are in xfs_dir2_leaf.h.
 *	Node blocks are the same as the other version, in xfs_da_btree.h.
 */

/*
 * Byte offset in data block and shortform entry.
 */
typedef	xfs_uint16_t	xfs_dir2_data_off_t;

/*
 * Byte offset in a directory.
 */
typedef	xfs_off_t		xfs_dir2_off_t;

/* those are from xfs_da_btree.h */
/*========================================================================
 * Directory Structure when greater than XFS_LBSIZE(mp) bytes.
 *========================================================================*/

/*
 * This structure is common to both leaf nodes and non-leaf nodes in the Btree.
 *
 * Is is used to manage a doubly linked list of all blocks at the same
 * level in the Btree, and to identify which type of block this is.
 */
#define	XFS_DIR2_LEAF1_MAGIC	0xd2f1	/* magic number: v2 dirlf single blks */
#define	XFS_DIR2_LEAFN_MAGIC	0xd2ff	/* magic number: v2 dirlf multi blks */

typedef struct xfs_da_blkinfo {
	xfs_dablk_t forw;			/* previous block in list */
	xfs_dablk_t back;			/* following block in list */
	xfs_uint16_t magic;			/* validity check on block */
	xfs_uint16_t pad;				/* unused */
} xfs_da_blkinfo_t;

/*
 * This is the structure of the root and intermediate nodes in the Btree.
 * The leaf nodes are defined above.
 *
 * Entries are not packed.
 *
 * Since we have duplicate keys, use a binary search but always follow
 * all match in the block, not just the first match found.
 */

typedef struct xfs_da_intnode {
	struct xfs_da_node_hdr {	/* constant-structure header block */
		xfs_da_blkinfo_t info;	/* block type, links, etc. */
		xfs_uint16_t count;	/* count of active entries */
		xfs_uint16_t level;	/* level above leaves (leaf == 0) */
	} hdr;
	struct xfs_da_node_entry {
		xfs_dahash_t hashval;	/* hash value for this descendant */
		xfs_dablk_t before;	/* Btree block before this key */
	} btree[1];			/* variable sized array of keys */
} xfs_da_intnode_t;


/* those are from xfs_dir2_data.h */
/*
 * Directory format 2, data block structures.
 */

/*
 * Constants.
 */
#define	XFS_DIR2_DATA_FREE_TAG	0xffff
#define	XFS_DIR2_DATA_FD_COUNT	3

/*
 * Structures.
 */

/*
 * Describe a free area in the data block.
 * The freespace will be formatted as a xfs_dir2_data_unused_t.
 */
typedef struct xfs_dir2_data_free {
	xfs_dir2_data_off_t	offset;		/* start of freespace */
	xfs_dir2_data_off_t	length;		/* length of freespace */
} xfs_dir2_data_free_t;

/*
 * Header for the data blocks.
 * Always at the beginning of a directory-sized block.
 * The code knows that XFS_DIR2_DATA_FD_COUNT is 3.
 */
typedef struct xfs_dir2_data_hdr {
	xfs_uint32_t		magic;		/* XFS_DIR2_DATA_MAGIC */
						/* or XFS_DIR2_BLOCK_MAGIC */
	xfs_dir2_data_free_t	bestfree[XFS_DIR2_DATA_FD_COUNT];
} xfs_dir2_data_hdr_t;

/*
 * Active entry in a data block.  Aligned to 8 bytes.
 * Tag appears as the last 2 bytes.
 */
typedef struct xfs_dir2_data_entry {
	xfs_ino_t		inumber;	/* inode number */
	xfs_uint8_t		namelen;	/* name length */
	xfs_uint8_t		name[1];	/* name bytes, no null */
						/* variable offset */
	xfs_dir2_data_off_t	tag;		/* starting offset of us */
} xfs_dir2_data_entry_t;

/*
 * Unused entry in a data block.  Aligned to 8 bytes.
 * Tag appears as the last 2 bytes.
 */
typedef struct xfs_dir2_data_unused {
	xfs_uint16_t		freetag;	/* XFS_DIR2_DATA_FREE_TAG */
	xfs_dir2_data_off_t	length;		/* total free length */
						/* variable offset */
	xfs_dir2_data_off_t	tag;		/* starting offset of us */
} xfs_dir2_data_unused_t;

typedef union {
	xfs_dir2_data_entry_t	entry;
	xfs_dir2_data_unused_t	unused;
} xfs_dir2_data_union_t;


/* those are from xfs_dir2_leaf.h */
/*
 * Directory version 2, leaf block structures.
 */

/*
 * Leaf block header.
 */
typedef struct xfs_dir2_leaf_hdr {
	xfs_da_blkinfo_t	info;		/* header for da routines */
	xfs_uint16_t		count;		/* count of entries */
	xfs_uint16_t		stale;		/* count of stale entries */
} xfs_dir2_leaf_hdr_t;


/* those are from xfs_dir2_block.h */
/*
 * xfs_dir2_block.h
 * Directory version 2, single block format structures
 */

/*
 * The single block format is as follows:
 * xfs_dir2_data_hdr_t structure
 * xfs_dir2_data_entry_t and xfs_dir2_data_unused_t structures
 * xfs_dir2_leaf_entry_t structures
 * xfs_dir2_block_tail_t structure
 */

#define	XFS_DIR2_BLOCK_MAGIC	0x58443242	/* XD2B: for one block dirs */

typedef struct xfs_dir2_block_tail {
	xfs_uint32_t	count;			/* count of leaf entries */
	xfs_uint32_t	stale;			/* count of stale lf entries */
} xfs_dir2_block_tail_t;


/* those are from xfs_dir2_sf.h */

/*
 * Directory layout when stored internal to an inode.
 *
 * Small directories are packed as tightly as possible so as to
 * fit into the literal area of the inode.
 */

/*
 * Inode number stored as 8 8-bit values.
 */
typedef	struct { xfs_uint8_t i[8]; } xfs_dir2_ino8_t;

/*
 * Inode number stored as 4 8-bit values.
 * Works a lot of the time, when all the inode numbers in a directory
 * fit in 32 bits.
 */
typedef struct { xfs_uint8_t i[4]; } xfs_dir2_ino4_t;

typedef union {
	xfs_dir2_ino8_t	i8;
	xfs_dir2_ino4_t	i4;
} xfs_dir2_inou_t;

/*
 * Normalized offset (in a data block) of the entry, really xfs_dir2_data_off_t.
 * Only need 16 bits, this is the byte offset into the single block form.
 */
typedef struct { xfs_uint8_t i[2]; } xfs_dir2_sf_off_t;

/*
 * The parent directory has a dedicated field, and the self-pointer must
 * be calculated on the fly.
 *
 * Entries are packed toward the top as tightly as possible.  The header
 * and the elements must be bcopy()'d out into a work area to get correct
 * alignment for the inode number fields.
 */
typedef struct xfs_dir2_sf_hdr {
	xfs_uint8_t		count;		/* count of entries */
	xfs_uint8_t		i8count;	/* count of 8-byte inode #s */
	xfs_dir2_inou_t		parent;		/* parent dir inode number */
} xfs_dir2_sf_hdr_t;

typedef struct xfs_dir2_sf_entry {
	xfs_uint8_t		namelen;	/* actual name length */
	xfs_dir2_sf_off_t	offset;		/* saved offset */
	xfs_uint8_t		name[1];	/* name, variable size */
	xfs_dir2_inou_t		inumber;	/* inode number, var. offset */
} xfs_dir2_sf_entry_t;

typedef struct xfs_dir2_sf {
	xfs_dir2_sf_hdr_t	hdr;		/* shortform header */
	xfs_dir2_sf_entry_t	list[1];	/* shortform entries */
} xfs_dir2_sf_t;

/* those are from xfs_dinode.h */

#define	XFS_DINODE_VERSION_1	1
#define	XFS_DINODE_VERSION_2	2
#define	XFS_DINODE_MAGIC	0x494e	/* 'IN' */

/*
 * Disk inode structure.
 * This is just the header; the inode is expanded to fill a variable size
 * with the last field expanding.  It is split into the core and "other"
 * because we only need the core part in the in-core inode.
 */
typedef struct xfs_timestamp {
	xfs_int32_t	t_sec;		/* timestamp seconds */
	xfs_int32_t	t_nsec;		/* timestamp nanoseconds */
} xfs_timestamp_t;

/*
 * Note: Coordinate changes to this structure with the XFS_DI_* #defines
 * below and the offsets table in xfs_ialloc_log_di().
 */
typedef struct xfs_dinode_core
{
	xfs_uint16_t	di_magic;	/* inode magic # = XFS_DINODE_MAGIC */
	xfs_uint16_t	di_mode;	/* mode and type of file */
	xfs_int8_t	di_version;	/* inode version */
	xfs_int8_t	di_format;	/* format of di_c data */
	xfs_uint16_t	di_onlink;	/* old number of links to file */
	xfs_uint32_t	di_uid;		/* owner's user id */
	xfs_uint32_t	di_gid;		/* owner's group id */
	xfs_uint32_t	di_nlink;	/* number of links to file */
	xfs_uint16_t	di_projid;	/* owner's project id */
	xfs_uint8_t	di_pad[10];	/* unused, zeroed space */
	xfs_timestamp_t	di_atime;	/* time last accessed */
	xfs_timestamp_t	di_mtime;	/* time last modified */
	xfs_timestamp_t	di_ctime;	/* time created/inode modified */
	xfs_fsize_t	di_size;	/* number of bytes in file */
	xfs_drfsbno_t	di_nblocks;	/* # of direct & btree blocks used */
	xfs_extlen_t	di_extsize;	/* basic/minimum extent size for file */
	xfs_extnum_t	di_nextents;	/* number of extents in data fork */
	xfs_aextnum_t	di_anextents;	/* number of extents in attribute fork*/
	xfs_uint8_t	di_forkoff;	/* attr fork offs, <<3 for 64b align */
	xfs_int8_t	di_aformat;	/* format of attr fork's data */
	xfs_uint32_t	di_dmevmask;	/* DMIG event mask */
	xfs_uint16_t	di_dmstate;	/* DMIG state info */
	xfs_uint16_t	di_flags;	/* random flags, XFS_DIFLAG_... */
	xfs_uint32_t	di_gen;		/* generation number */
} xfs_dinode_core_t;

typedef struct xfs_dinode
{
	xfs_dinode_core_t	di_core;
	xfs_agino_t		di_next_unlinked;/* agi unlinked list ptr */
	union {
		xfs_bmdr_block_t di_bmbt;	/* btree root block */
		xfs_bmbt_rec_32_t di_bmx[1];	/* extent list */
		xfs_dir2_sf_t	di_dir2sf;	/* shortform directory v2 */
		char		di_c[1];	/* local contents */
	} di_u;
} xfs_dinode_t;

/*
 * Values for di_format
 */
typedef enum xfs_dinode_fmt
{
	XFS_DINODE_FMT_DEV,		/* CHR, BLK: di_dev */
	XFS_DINODE_FMT_LOCAL,		/* DIR, REG: di_c */
					/* LNK: di_symlink */
	XFS_DINODE_FMT_EXTENTS,		/* DIR, REG, LNK: di_bmx */
	XFS_DINODE_FMT_BTREE,		/* DIR, REG, LNK: di_bmbt */
	XFS_DINODE_FMT_UUID 		/* MNT: di_uuid */
} xfs_dinode_fmt_t;

/*
 * File types (mode field)
 */
#define	IFMT		0170000		/* type of file */
#define	IFDIR		0040000		/* directory */
#define	IFREG		0100000		/* regular */
#define	IFLNK		0120000		/* symbolic link */