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use filldir internally

Currently xfs has a rather complicated internal scheme to allow for
different directory formats in IRIX.  This patch rips all code related
to this out and pushes useage of the Linux filldir callback into the
lowlevel directory code.  This does not make the code any less portable
because filldir can be used to create dirents of all possible variations
(including the IRIX ones as proved by the IRIX binary emulation code
under arch/mips/).

This patch get rid of an unessecary copy in the readdir path, about
400 lines of code and one of the last two users of the uio structure.

This version is updated to deal with dmapi aswell which greatly
simplifies the get_dirattrs code.  The dmapi part has been tested
using the get_dirattrs tools from the xfstest dmapi suite1 with various
small and large directories.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of xfs-linux-melb:xfs-kern:29478a by kenmcd.

  Use the generic filldir directory formatter callbacks rather than
  the complex xfs_uio_move based implementation. Removes a copy
  and simplifies the code greatly.

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * 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.
 *
 * 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.  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 the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_TYPES_H__
#define	__XFS_TYPES_H__

#ifdef __KERNEL__

/*
 * POSIX Extensions
 */
typedef unsigned char		uchar_t;
typedef unsigned short		ushort_t;
typedef unsigned int		uint_t;
typedef unsigned long		ulong_t;

/*
 * Additional type declarations for XFS
 */
typedef signed char		__int8_t;
typedef unsigned char		__uint8_t;
typedef signed short int	__int16_t;
typedef unsigned short int	__uint16_t;
typedef signed int		__int32_t;
typedef unsigned int		__uint32_t;
typedef signed long long int	__int64_t;
typedef unsigned long long int	__uint64_t;

typedef enum { B_FALSE,B_TRUE }	boolean_t;
typedef __uint32_t		prid_t;		/* project ID */
typedef __uint32_t		inst_t;		/* an instruction */

typedef __s64			xfs_off_t;	/* <file offset> type */
typedef __u64			xfs_ino_t;	/* <inode> type */
typedef __s64			xfs_daddr_t;	/* <disk address> type */
typedef char *			xfs_caddr_t;	/* <core address> type */
typedef __u32			xfs_dev_t;
typedef __u32			xfs_nlink_t;

/* __psint_t is the same size as a pointer */
#if (BITS_PER_LONG == 32)
typedef __int32_t __psint_t;
typedef __uint32_t __psunsigned_t;
#elif (BITS_PER_LONG == 64)
typedef __int64_t __psint_t;
typedef __uint64_t __psunsigned_t;
#else
#error BITS_PER_LONG must be 32 or 64
#endif

#endif	/* __KERNEL__ */

typedef __uint32_t	xfs_agblock_t;	/* blockno in alloc. group */
typedef	__uint32_t	xfs_extlen_t;	/* extent length in blocks */
typedef	__uint32_t	xfs_agnumber_t;	/* allocation group number */
typedef __int32_t	xfs_extnum_t;	/* # of extents in a file */
typedef __int16_t	xfs_aextnum_t;	/* # extents in an attribute fork */
typedef	__int64_t	xfs_fsize_t;	/* bytes in a file */
typedef __uint64_t	xfs_ufsize_t;	/* unsigned bytes in a file */

typedef	__int32_t	xfs_suminfo_t;	/* type of bitmap summary info */
typedef	__int32_t	xfs_rtword_t;	/* word type for bitmap manipulations */

typedef	__int64_t	xfs_lsn_t;	/* log sequence number */
typedef	__int32_t	xfs_tid_t;	/* transaction identifier */

typedef	__uint32_t	xfs_dablk_t;	/* dir/attr block number (in file) */
typedef	__uint32_t	xfs_dahash_t;	/* dir/attr hash value */

typedef __uint16_t	xfs_prid_t;	/* prid_t truncated to 16bits in XFS */

/*
 * These types are 64 bits on disk but are either 32 or 64 bits in memory.
 * Disk based types:
 */
typedef __uint64_t	xfs_dfsbno_t;	/* blockno in filesystem (agno|agbno) */
typedef __uint64_t	xfs_drfsbno_t;	/* blockno in filesystem (raw) */
typedef	__uint64_t	xfs_drtbno_t;	/* extent (block) in realtime area */
typedef	__uint64_t	xfs_dfiloff_t;	/* block number in a file */
typedef	__uint64_t	xfs_dfilblks_t;	/* number of blocks in a file */

/*
 * Memory based types are conditional.
 */
#if XFS_BIG_BLKNOS
typedef	__uint64_t	xfs_fsblock_t;	/* blockno in filesystem (agno|agbno) */
typedef __uint64_t	xfs_rfsblock_t;	/* blockno in filesystem (raw) */
typedef __uint64_t	xfs_rtblock_t;	/* extent (block) in realtime area */
typedef	__int64_t	xfs_srtblock_t;	/* signed version of xfs_rtblock_t */
#else
typedef	__uint32_t	xfs_fsblock_t;	/* blockno in filesystem (agno|agbno) */
typedef __uint32_t	xfs_rfsblock_t;	/* blockno in filesystem (raw) */
typedef __uint32_t	xfs_rtblock_t;	/* extent (block) in realtime area */
typedef	__int32_t	xfs_srtblock_t;	/* signed version of xfs_rtblock_t */
#endif
typedef __uint64_t	xfs_fileoff_t;	/* block number in a file */
typedef __int64_t	xfs_sfiloff_t;	/* signed block number in a file */
typedef __uint64_t	xfs_filblks_t;	/* number of blocks in a file */

typedef __uint8_t	xfs_arch_t;	/* architecture of an xfs fs */

/*
 * Null values for the types.
 */
#define	NULLDFSBNO	((xfs_dfsbno_t)-1)
#define	NULLDRFSBNO	((xfs_drfsbno_t)-1)
#define	NULLDRTBNO	((xfs_drtbno_t)-1)
#define	NULLDFILOFF	((xfs_dfiloff_t)-1)

#define	NULLFSBLOCK	((xfs_fsblock_t)-1)
#define	NULLRFSBLOCK	((xfs_rfsblock_t)-1)
#define	NULLRTBLOCK	((xfs_rtblock_t)-1)
#define	NULLFILEOFF	((xfs_fileoff_t)-1)

#define	NULLAGBLOCK	((xfs_agblock_t)-1)
#define	NULLAGNUMBER	((xfs_agnumber_t)-1)
#define	NULLEXTNUM	((xfs_extnum_t)-1)

#define NULLCOMMITLSN	((xfs_lsn_t)-1)

/*
 * Max values for extlen, extnum, aextnum.
 */
#define	MAXEXTLEN	((xfs_extlen_t)0x001fffff)	/* 21 bits */
#define	MAXEXTNUM	((xfs_extnum_t)0x7fffffff)	/* signed int */
#define	MAXAEXTNUM	((xfs_aextnum_t)0x7fff)		/* signed short */

/*
 * Min numbers of data/attr fork btree root pointers.
 */
#define MINDBTPTRS	3
#define MINABTPTRS	2

/*
 * MAXNAMELEN is the length (including the terminating null) of
 * the longest permissible file (component) name.
 */
#define MAXNAMELEN	256

typedef enum {
	XFS_LOOKUP_EQi, XFS_LOOKUP_LEi, XFS_LOOKUP_GEi
} xfs_lookup_t;

typedef enum {
	XFS_BTNUM_BNOi, XFS_BTNUM_CNTi, XFS_BTNUM_BMAPi, XFS_BTNUM_INOi,
	XFS_BTNUM_MAX
} xfs_btnum_t;

#endif	/* __XFS_TYPES_H__ */