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Ondisk format extension for extended attributes (attr2).  Basically, the data/attr forks now grow up/down from either end of the literal area, rather than dividing the literal area into two chunks and growing both upward.  Means we can now make much more efficient use of the attribute space, incl. fitting DMF attributes inline in 256 byte inodes, and large jumps in dbench3 performance numbers.  It is self enabling, but can be forced on/off via the attr2/noattr2 mount options.
Merge of xfs-linux-melb:xfs-kern:23836a by kenmcd.

/*
 * 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 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/
 */
#ifndef __XFS_CLNT_H__
#define __XFS_CLNT_H__

/*
 * XFS arguments structure, constructed from the arguments we
 * are passed via the mount system call.
 *
 * NOTE: The mount system call is handled differently between
 * Linux and IRIX.  In IRIX we worked work with a binary data
 * structure coming in across the syscall interface from user
 * space (the mount userspace knows about each filesystem type
 * and the set of valid options for it, and converts the users
 * argument string into a binary structure _before_ making the
 * system call), and the ABI issues that this implies.
 *
 * In Linux, we are passed a comma separated set of options;
 * ie. a NULL terminated string of characters.  Userspace mount
 * code does not have any knowledge of mount options expected by
 * each filesystem type and so each filesystem parses its mount
 * options in kernel space.
 *
 * For the Linux port, we kept this structure pretty much intact
 * and use it internally (because the existing code groks it).
 */
struct xfs_mount_args {
	int	flags;		/* flags -> see XFSMNT_... macros below */
	int	logbufs;	/* Number of log buffers, -1 to default */
	int	logbufsize;	/* Size of log buffers, -1 to default */
	char	fsname[MAXNAMELEN+1];	/* data device name */
	char	rtname[MAXNAMELEN+1];	/* realtime device filename */
	char	logname[MAXNAMELEN+1];	/* journal device filename */
	char	mtpt[MAXNAMELEN+1];	/* filesystem mount point */
	int	sunit;		/* stripe unit (BBs) */
	int	swidth;		/* stripe width (BBs), multiple of sunit */
	uchar_t iosizelog;	/* log2 of the preferred I/O size */
	int	ihashsize;	/* inode hash table size (buckets) */
};

/*
 * XFS mount option flags
 */
#define	XFSMNT_COMPAT_ATTR	0x00000001	/* do not use ATTR2 format */
#define	XFSMNT_WSYNC		0x00000002	/* safe mode nfs mount
						 * compatible */
#define	XFSMNT_INO64		0x00000004	/* move inode numbers up
						 * past 2^32 */
#define XFSMNT_UQUOTA		0x00000008	/* user quota accounting */
#define XFSMNT_PQUOTA		0x00000010	/* IRIX prj quota accounting */
#define XFSMNT_UQUOTAENF	0x00000020	/* user quota limit
						 * enforcement */
#define XFSMNT_PQUOTAENF	0x00000040	/* IRIX project quota limit
						 * enforcement */
#define XFSMNT_NOATIME		0x00000100	/* don't modify access
						 * times on reads */
#define XFSMNT_NOALIGN		0x00000200	/* don't allocate at
						 * stripe boundaries*/
#define XFSMNT_RETERR		0x00000400	/* return error to user */
#define XFSMNT_NORECOVERY	0x00000800	/* no recovery, implies
						 * read-only mount */
#define XFSMNT_SHARED		0x00001000	/* shared XFS mount */
#define XFSMNT_IOSIZE		0x00002000	/* optimize for I/O size */
#define XFSMNT_OSYNCISOSYNC	0x00004000	/* o_sync is REALLY o_sync */
						/* (osyncisdsync is now default) */
#define XFSMNT_32BITINODES	0x00200000	/* restrict inodes to 32
						 * bits of address space */
#define XFSMNT_GQUOTA		0x00400000	/* group quota accounting */
#define XFSMNT_GQUOTAENF	0x00800000	/* group quota limit
						 * enforcement */
#define XFSMNT_NOUUID		0x01000000	/* Ignore fs uuid */
#define XFSMNT_DMAPI		0x02000000	/* enable dmapi/xdsm */
#define XFSMNT_BARRIER		0x04000000	/* use write barriers */
#define XFSMNT_IDELETE		0x08000000	/* inode cluster delete */
#define XFSMNT_SWALLOC		0x10000000	/* turn on stripe width
						 * allocation */
#define XFSMNT_IHASHSIZE	0x20000000	/* inode hash table size */
#define XFSMNT_DIRSYNC		0x40000000	/* sync creat,link,unlink,rename
						 * symlink,mkdir,rmdir,mknod */
#define XFSMNT_COMPAT_IOSIZE	0x80000000	/* don't report large preferred
						 * I/O size in stat() */

#endif	/* __XFS_CLNT_H__ */