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change remount code so that it calls a vfs operation within
XFS. reorganize the code underneath it. This better separates
the linux vfs code and the xfs specific code and will let
us enable more options on remount.
add mntupdate support

/*
 * Copyright (c) 2000-2003 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_VFS_H__
#define __XFS_VFS_H__

#include <linux/vfs.h>

struct fid;
struct cred;
struct vnode;
struct statfs;
struct seq_file;
struct super_block;
struct xfs_mount_args;

typedef struct vfs {
	u_int			vfs_flag;	/* flags */
	fsid_t			vfs_fsid;	/* file system ID */
	fsid_t			*vfs_altfsid;	/* An ID fixed for life of FS */
	bhv_head_t		vfs_bh;		/* head of vfs behavior chain */
	struct super_block	*vfs_super;	/* Linux superblock structure */
} vfs_t;

#define vfs_fbhv		vfs_bh.bh_first	/* 1st on vfs behavior chain */

#define bhvtovfs(bdp)		( (struct vfs *)BHV_VOBJ(bdp) )
#define bhvtovfsops(bdp)	( (struct vfsops *)BHV_OPS(bdp) )
#define VFS_BHVHEAD(vfs)	( &(vfs)->vfs_bh )
#define VFS_REMOVEBHV(vfs, bdp)	( bhv_remove(VFS_BHVHEAD(vfs), bdp) )

#define VFS_POSITION_BASE	BHV_POSITION_BASE	/* chain bottom */
#define VFS_POSITION_TOP	BHV_POSITION_TOP	/* chain top */
#define VFS_POSITION_INVALID	BHV_POSITION_INVALID	/* invalid pos. num */

typedef enum {
	VFS_BHV_UNKNOWN,	/* not specified */
	VFS_BHV_XFS,		/* xfs */
	VFS_BHV_DM,		/* data migration */
	VFS_BHV_QM,		/* quota manager */
	VFS_BHV_IO,		/* IO path */
	VFS_BHV_END		/* housekeeping end-of-range */
} vfs_bhv_t;

#define VFS_POSITION_XFS	(BHV_POSITION_BASE)
#define VFS_POSITION_DM		(VFS_POSITION_BASE+10)
#define VFS_POSITION_QM		(VFS_POSITION_BASE+20)
#define VFS_POSITION_IO		(VFS_POSITION_BASE+30)

#define VFS_RDONLY		0x0001	/* read-only vfs */
#define VFS_GRPID		0x0002	/* group-ID assigned from directory */
#define VFS_DMI			0x0004	/* filesystem has the DMI enabled */
#define VFS_END			0x0004	/* max flag */

#define SYNC_ATTR		0x0001	/* sync attributes */
#define SYNC_CLOSE		0x0002	/* close file system down */
#define SYNC_DELWRI		0x0004	/* look at delayed writes */
#define SYNC_WAIT		0x0008	/* wait for i/o to complete */
#define SYNC_FSDATA		0x0020	/* flush fs data (e.g. superblocks) */
#define SYNC_BDFLUSH		0x0010	/* BDFLUSH is calling -- don't block */

#define IGET_NOALLOC		0x0001	/* vfs_get_inode may return NULL */

typedef int	(*vfs_mount_t)(bhv_desc_t *,
				struct xfs_mount_args *, struct cred *);
typedef int	(*vfs_parseargs_t)(bhv_desc_t *, char *,
				struct xfs_mount_args *, int);
typedef	int	(*vfs_showargs_t)(bhv_desc_t *, struct seq_file *);
typedef int	(*vfs_unmount_t)(bhv_desc_t *, int, struct cred *);
typedef int	(*vfs_mntupdate_t)(bhv_desc_t *, int *,
				struct xfs_mount_args *);
typedef int	(*vfs_root_t)(bhv_desc_t *, struct vnode **);
typedef int	(*vfs_statvfs_t)(bhv_desc_t *, struct statfs *, struct vnode *);
typedef int	(*vfs_sync_t)(bhv_desc_t *, int, struct cred *);
typedef int	(*vfs_vget_t)(bhv_desc_t *, struct vnode **, struct fid *);
typedef int	(*vfs_dmapiops_t)(bhv_desc_t *, caddr_t);
typedef int	(*vfs_quotactl_t)(bhv_desc_t *, int, int, caddr_t);
typedef void	(*vfs_init_vnode_t)(bhv_desc_t *,
				struct vnode *, bhv_desc_t *, int);
typedef void	(*vfs_force_shutdown_t)(bhv_desc_t *, int, char *, int);
typedef	struct inode * (*vfs_get_inode_t)(bhv_desc_t *, xfs_ino_t, int);

typedef struct vfsops {
	bhv_position_t		vf_position;	/* behavior chain position */
	vfs_mount_t		vfs_mount;	/* mount file system */
	vfs_parseargs_t		vfs_parseargs;	/* parse mount options */
	vfs_showargs_t		vfs_showargs;	/* unparse mount options */
	vfs_unmount_t		vfs_unmount;	/* unmount file system */
	vfs_mntupdate_t		vfs_mntupdate;	/* update file system options */
	vfs_root_t		vfs_root;	/* get root vnode */
	vfs_statvfs_t		vfs_statvfs;	/* file system statistics */
	vfs_sync_t		vfs_sync;	/* flush files */
	vfs_vget_t		vfs_vget;	/* get vnode from fid */
	vfs_dmapiops_t		vfs_dmapiops;	/* data migration */
	vfs_quotactl_t		vfs_quotactl;	/* disk quota */
	vfs_get_inode_t		vfs_get_inode;	/* bhv specific iget */
	vfs_init_vnode_t	vfs_init_vnode;	/* initialize a new vnode */
	vfs_force_shutdown_t	vfs_force_shutdown;	/* crash and burn */
} vfsops_t;

/*
 * VFS's.  Operates on vfs structure pointers (starts at bhv head).
 */
#define VHEAD(v)			((v)->vfs_fbhv)
#define VFS_MOUNT(v, ma,cr, rv)		((rv) = vfs_mount(VHEAD(v), ma,cr))
#define VFS_PARSEARGS(v, o,ma,f, rv)	((rv) = vfs_parseargs(VHEAD(v), o,ma,f))
#define VFS_SHOWARGS(v, m, rv)		((rv) = vfs_showargs(VHEAD(v), m))
#define VFS_UNMOUNT(v, f, cr, rv)	((rv) = vfs_unmount(VHEAD(v), f,cr))
#define VFS_MNTUPDATE(v, fl, args, rv)	((rv) = vfs_mntupdate(VHEAD(v), fl, args))
#define VFS_ROOT(v, vpp, rv)		((rv) = vfs_root(VHEAD(v), vpp))
#define VFS_STATVFS(v, sp,vp, rv)	((rv) = vfs_statvfs(VHEAD(v), sp,vp))
#define VFS_SYNC(v, flag,cr, rv)	((rv) = vfs_sync(VHEAD(v), flag,cr))
#define VFS_VGET(v, vpp,fidp, rv)	((rv) = vfs_vget(VHEAD(v), vpp,fidp))
#define VFS_DMAPIOPS(v, p, rv)		((rv) = vfs_dmapiops(VHEAD(v), p))
#define VFS_QUOTACTL(v, c,id,p, rv)	((rv) = vfs_quotactl(VHEAD(v), c,id,p))
#define VFS_GET_INODE(v, ino, fl)	( vfs_get_inode(VHEAD(v), ino,fl) )
#define VFS_INIT_VNODE(v, vp,b,ul)	( vfs_init_vnode(VHEAD(v), vp,b,ul) )
#define VFS_FORCE_SHUTDOWN(v, fl,f,l)	( vfs_force_shutdown(VHEAD(v), fl,f,l) )

/*
 * PVFS's.  Operates on behavior descriptor pointers.
 */
#define PVFS_MOUNT(b, ma,cr, rv)	((rv) = vfs_mount(b, ma,cr))
#define PVFS_PARSEARGS(b, o,ma,f, rv)	((rv) = vfs_parseargs(b, o,ma,f))
#define PVFS_SHOWARGS(b, m, rv)		((rv) = vfs_showargs(b, m))
#define PVFS_UNMOUNT(b, f,cr, rv)	((rv) = vfs_unmount(b, f,cr))
#define PVFS_MNTUPDATE(b, fl, args, rv)	((rv) = vfs_mntupdate(b, fl, args))
#define PVFS_ROOT(b, vpp, rv)		((rv) = vfs_root(b, vpp))
#define PVFS_STATVFS(b, sp,vp, rv)	((rv) = vfs_statvfs(b, sp,vp))
#define PVFS_SYNC(b, flag,cr, rv)	((rv) = vfs_sync(b, flag,cr))
#define PVFS_VGET(b, vpp,fidp, rv)	((rv) = vfs_vget(b, vpp,fidp))
#define PVFS_DMAPIOPS(b, p, rv)		((rv) = vfs_dmapiops(b, p))
#define PVFS_QUOTACTL(b, c,id,p, rv)	((rv) = vfs_quotactl(b, c,id,p))
#define PVFS_GET_INODE(b, ino,fl)	( vfs_get_inode(b, ino,fl) )
#define PVFS_INIT_VNODE(b, vp,b2,ul)	( vfs_init_vnode(b, vp,b2,ul) )
#define PVFS_FORCE_SHUTDOWN(b, fl,f,l)	( vfs_force_shutdown(b, fl,f,l) )

extern int vfs_mount(bhv_desc_t *, struct xfs_mount_args *, struct cred *);
extern int vfs_parseargs(bhv_desc_t *, char *, struct xfs_mount_args *, int);
extern int vfs_showargs(bhv_desc_t *, struct seq_file *);
extern int vfs_unmount(bhv_desc_t *, int, struct cred *);
extern int vfs_mntupdate(bhv_desc_t *, int *, struct xfs_mount_args *);
extern int vfs_root(bhv_desc_t *, struct vnode **);
extern int vfs_statvfs(bhv_desc_t *, struct statfs *, struct vnode *);
extern int vfs_sync(bhv_desc_t *, int, struct cred *);
extern int vfs_vget(bhv_desc_t *, struct vnode **, struct fid *);
extern int vfs_dmapiops(bhv_desc_t *, caddr_t);
extern int vfs_quotactl(bhv_desc_t *, int, int, caddr_t);
extern struct inode *vfs_get_inode(bhv_desc_t *, xfs_ino_t, int);
extern void vfs_init_vnode(bhv_desc_t *, struct vnode *, bhv_desc_t *, int);
extern void vfs_force_shutdown(bhv_desc_t *, int, char *, int);

typedef struct bhv_vfsops {
	struct vfsops		bhv_common;
	void *			bhv_custom;
} bhv_vfsops_t;

#define vfs_bhv_lookup(v, id)	( bhv_lookup_range(&(v)->vfs_bh, (id), (id)) )
#define vfs_bhv_custom(b)	( ((bhv_vfsops_t *)BHV_OPS(b))->bhv_custom )
#define vfs_bhv_set_custom(b,o)	( (b)->bhv_custom = (void *)(o))
#define vfs_bhv_clr_custom(b)	( (b)->bhv_custom = NULL )

extern vfs_t *vfs_allocate(void);
extern void vfs_deallocate(vfs_t *);
extern void vfs_insertops(vfs_t *, bhv_vfsops_t *);
extern void vfs_insertbhv(vfs_t *, bhv_desc_t *, vfsops_t *, void *);

extern void bhv_insert_all_vfsops(struct vfs *);
extern void bhv_remove_all_vfsops(struct vfs *, int);
extern void bhv_remove_vfsops(struct vfs *, int);

#endif	/* __XFS_VFS_H__ */