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From Chris Hellwig:

* CONFIG_XFS_DMAPI is now a dep_mbool on CONFIG_XFS_FS, fs/xfs_dmapi/
  is entered based on CONFIG_XFS_FS if CONFIG_XFS_DMAPI is set to keep
  the old behaviour.
* CONFIG_HAVE_XFS_DMAPI is gone, as CONFIG_XFS_DMAPI has the same
  meaning now.
* we refuse to mount with dmapi/xdsm options now if we can't support it.
* this way the dmapi_mount vfs method can't be called without dmapi
  support anymore.  declare the two dmapi-related vfs methods only if
  we build with dmapi support.
* fs/xfs/xfsdmapistubs.c is gone, all stubs for XFS-own
  dmapi-related functions are inlines in xfs_dmapi.h now.
* xfs_dmapi_mmap_event is renamed to xfs_dm_send_mmap_event to match the
  other xfs_dm_send_* functions
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/*
 * Copyright (c) 2000-2002 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_DMAPI_H__
#define __XFS_DMAPI_H__

/*	Values used to define the on-disk version of dm_attrname_t. All
 *	on-disk attribute names start with the 8-byte string "SGI_DMI_".
 *
 *	In the on-disk inode, DMAPI attribute names consist of the user-provided
 *	name with the DMATTR_PREFIXSTRING pre-pended.  This string must NEVER be
 *	changed.
 */

#define DMATTR_PREFIXLEN	8
#define DMATTR_PREFIXSTRING	"SGI_DMI_"

#ifdef	__KERNEL__
/* Defines for determining if an event message should be sent. */
#define DM_EVENT_ENABLED(vfsp, ip, event) ( \
	unlikely ((vfsp)->vfs_flag & VFS_DMI) && \
		( ((ip)->i_d.di_dmevmask & (1 << event)) || \
		  ((ip)->i_mount->m_dmevmask & (1 << event)) ) \
	)

#define DM_EVENT_ENABLED_IO(vfsp, io, event) ( \
	unlikely ((vfsp)->vfs_flag & VFS_DMI) && \
		( ((io)->io_dmevmask & (1 << event)) || \
		  ((io)->io_mount->m_dmevmask & (1 << event)) ) \
	)

/*
 *	Macros to turn caller specified delay/block flags into
 *	dm_send_xxxx_event flag DM_FLAGS_NDELAY.
 */

#define FILP_DELAY_FLAG(filp) ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) ? \
			DM_FLAGS_NDELAY : 0)
#define AT_DELAY_FLAG(f) ((f&ATTR_NONBLOCK) ? DM_FLAGS_NDELAY : 0)



/* events valid in dm_set_eventlist() when called with a filesystem handle.
   These events are not persistent.
*/

#define DM_XFS_VALID_FS_EVENTS		( \
	(1 << DM_EVENT_PREUNMOUNT)	| \
	(1 << DM_EVENT_UNMOUNT)		| \
	(1 << DM_EVENT_NOSPACE)		| \
	(1 << DM_EVENT_DEBUT)		| \
	(1 << DM_EVENT_CREATE)		| \
	(1 << DM_EVENT_POSTCREATE)	| \
	(1 << DM_EVENT_REMOVE)		| \
	(1 << DM_EVENT_POSTREMOVE)	| \
	(1 << DM_EVENT_RENAME)		| \
	(1 << DM_EVENT_POSTRENAME)	| \
	(1 << DM_EVENT_LINK)		| \
	(1 << DM_EVENT_POSTLINK)	| \
	(1 << DM_EVENT_SYMLINK)		| \
	(1 << DM_EVENT_POSTSYMLINK)	| \
	(1 << DM_EVENT_ATTRIBUTE)	| \
	(1 << DM_EVENT_DESTROY)		)

/* Events valid in dm_set_eventlist() when called with a file handle for
   a regular file or a symlink.	 These events are persistent.
*/

#define DM_XFS_VALID_FILE_EVENTS	( \
	(1 << DM_EVENT_ATTRIBUTE)	| \
	(1 << DM_EVENT_DESTROY)		)

/* Events valid in dm_set_eventlist() when called with a file handle for
   a directory.	 These events are persistent.
*/

#define DM_XFS_VALID_DIRECTORY_EVENTS	( \
	(1 << DM_EVENT_CREATE)		| \
	(1 << DM_EVENT_POSTCREATE)	| \
	(1 << DM_EVENT_REMOVE)		| \
	(1 << DM_EVENT_POSTREMOVE)	| \
	(1 << DM_EVENT_RENAME)		| \
	(1 << DM_EVENT_POSTRENAME)	| \
	(1 << DM_EVENT_LINK)		| \
	(1 << DM_EVENT_POSTLINK)	| \
	(1 << DM_EVENT_SYMLINK)		| \
	(1 << DM_EVENT_POSTSYMLINK)	| \
	(1 << DM_EVENT_ATTRIBUTE)	| \
	(1 << DM_EVENT_DESTROY)		)


/* Events supported by the XFS filesystem. */
#define DM_XFS_SUPPORTED_EVENTS		( \
	(1 << DM_EVENT_MOUNT)		| \
	(1 << DM_EVENT_PREUNMOUNT)	| \
	(1 << DM_EVENT_UNMOUNT)		| \
	(1 << DM_EVENT_NOSPACE)		| \
	(1 << DM_EVENT_CREATE)		| \
	(1 << DM_EVENT_POSTCREATE)	| \
	(1 << DM_EVENT_REMOVE)		| \
	(1 << DM_EVENT_POSTREMOVE)	| \
	(1 << DM_EVENT_RENAME)		| \
	(1 << DM_EVENT_POSTRENAME)	| \
	(1 << DM_EVENT_LINK)		| \
	(1 << DM_EVENT_POSTLINK)	| \
	(1 << DM_EVENT_SYMLINK)		| \
	(1 << DM_EVENT_POSTSYMLINK)	| \
	(1 << DM_EVENT_READ)		| \
	(1 << DM_EVENT_WRITE)		| \
	(1 << DM_EVENT_TRUNCATE)	| \
	(1 << DM_EVENT_ATTRIBUTE)	| \
	(1 << DM_EVENT_DESTROY)		)

#ifdef CONFIG_XFS_DMAPI
extern int
xfs_dm_mount(
	vfs_t		*vfsp,
	char		*dir_name,
	char		*fsname);

extern int
xfs_dm_get_fsys_vector(
	bhv_desc_t	*bdp,
	dm_fcntl_vector_t *vecrq);

extern int
xfs_dm_send_data_event(
	dm_eventtype_t	event,
	bhv_desc_t	*bdp,
	xfs_off_t	offset,
	size_t		length,
	int		flags,
	vrwlock_t	*locktype);

extern int
xfs_dm_send_create_event(
	bhv_desc_t	*dir_bdp,
	char		*name,
	mode_t		new_mode,
	int		*good_event_sent);

extern int
xfs_dm_send_mmap_event(
	struct vm_area_struct *vma,
	unsigned int	wantflag);
#else

/*
 *	XFS DMAPI utilitie routine stubs.
 */
static __inline int
xfs_dm_send_create_event(
	bhv_desc_t	*dir_bdp,
	char		*name,
	mode_t		new_mode,
	int		*good_event_sent)
{
	return 0;
}

static __inline int
xfs_dm_send_data_event(
	dm_eventtype_t	event,
	bhv_desc_t	*bdp,
	xfs_off_t	offset,
	size_t		length,
	int		flags,
	vrwlock_t	*locktype)
{
	return nopkg();
}

static __inline int
xfs_dm_send_mmap_event(
	struct vm_area_struct *vma,
	unsigned int	wantflag)
{
	return 0;
}

#endif	/* CONFIG_XFS_DMAPI */
#endif	/* __KERNEL__ */
#endif	/* __XFS_DMAPI_H__ */