path: root/fs/xfs/linux-2.6/xfs_vnode.h

/*
 * 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
 *
 * Portions Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#ifndef __XFS_VNODE_H__
#define __XFS_VNODE_H__

struct uio;
struct file;
struct vattr;
struct xfs_iomap;
struct attrlist_cursor_kern;


typedef xfs_ino_t vnumber_t;
typedef struct dentry vname_t;
typedef bhv_head_t vn_bhv_head_t;

/*
 * MP locking protocols:
 *	v_flag, v_vfsp				VN_LOCK/VN_UNLOCK
 */
typedef struct vnode {
	__u32		v_flag;			/* vnode flags (see below) */
	struct vfs	*v_vfsp;		/* ptr to containing VFS */
	vnumber_t	v_number;		/* in-core vnode number */
	vn_bhv_head_t	v_bh;			/* behavior head */
	spinlock_t	v_lock;			/* VN_LOCK/VN_UNLOCK */
	atomic_t	v_iocount;		/* outstanding I/O count */
#ifdef XFS_VNODE_TRACE
	struct ktrace	*v_trace;		/* trace header structure    */
#endif
	struct inode	v_inode;		/* Linux inode */
	/* inode MUST be last */
} vnode_t;

#define VN_ISLNK(vp)	S_ISLNK((vp)->v_inode.i_mode)
#define VN_ISREG(vp)	S_ISREG((vp)->v_inode.i_mode)
#define VN_ISDIR(vp)	S_ISDIR((vp)->v_inode.i_mode)
#define VN_ISCHR(vp)	S_ISCHR((vp)->v_inode.i_mode)
#define VN_ISBLK(vp)	S_ISBLK((vp)->v_inode.i_mode)

#define v_fbhv			v_bh.bh_first	       /* first behavior */
#define v_fops			v_bh.bh_first->bd_ops  /* first behavior ops */

#define VNODE_POSITION_BASE	BHV_POSITION_BASE	/* chain bottom */
#define VNODE_POSITION_TOP	BHV_POSITION_TOP	/* chain top */
#define VNODE_POSITION_INVALID	BHV_POSITION_INVALID	/* invalid pos. num */

typedef enum {
	VN_BHV_UNKNOWN,		/* not specified */
	VN_BHV_XFS,		/* xfs */
	VN_BHV_DM,		/* data migration */
	VN_BHV_QM,		/* quota manager */
	VN_BHV_IO,		/* IO path */
	VN_BHV_END		/* housekeeping end-of-range */
} vn_bhv_t;

#define VNODE_POSITION_XFS	(VNODE_POSITION_BASE)
#define VNODE_POSITION_DM	(VNODE_POSITION_BASE+10)
#define VNODE_POSITION_QM	(VNODE_POSITION_BASE+20)
#define VNODE_POSITION_IO	(VNODE_POSITION_BASE+30)

/*
 * Macros for dealing with the behavior descriptor inside of the vnode.
 */
#define BHV_TO_VNODE(bdp)	((vnode_t *)BHV_VOBJ(bdp))
#define BHV_TO_VNODE_NULL(bdp)	((vnode_t *)BHV_VOBJNULL(bdp))

#define VN_BHV_HEAD(vp)			((bhv_head_t *)(&((vp)->v_bh)))
#define vn_bhv_head_init(bhp,name)	bhv_head_init(bhp,name)
#define vn_bhv_remove(bhp,bdp)		bhv_remove(bhp,bdp)
#define vn_bhv_lookup(bhp,ops)		bhv_lookup(bhp,ops)
#define vn_bhv_lookup_unlocked(bhp,ops) bhv_lookup_unlocked(bhp,ops)

/*
 * Vnode to Linux inode mapping.
 */
static inline struct vnode *vn_from_inode(struct inode *inode)
{
	return (vnode_t *)list_entry(inode, vnode_t, v_inode);
}
static inline struct inode *vn_to_inode(struct vnode *vnode)
{
	return &vnode->v_inode;
}

/*
 * Vnode flags.
 */
#define VMODIFIED	       0x8	/* XFS inode state possibly differs */
					/* to the Linux inode state.	*/

/*
 * Values for the VOP_RWLOCK and VOP_RWUNLOCK flags parameter.
 */
typedef enum vrwlock {
	VRWLOCK_NONE,
	VRWLOCK_READ,
	VRWLOCK_WRITE,
	VRWLOCK_WRITE_DIRECT,
	VRWLOCK_TRY_READ,
	VRWLOCK_TRY_WRITE
} vrwlock_t;

/*
 * Return values for VOP_INACTIVE.  A return value of
 * VN_INACTIVE_NOCACHE implies that the file system behavior
 * has disassociated its state and bhv_desc_t from the vnode.
 */
#define	VN_INACTIVE_CACHE	0
#define	VN_INACTIVE_NOCACHE	1

/*
 * Values for the cmd code given to VOP_VNODE_CHANGE.
 */
typedef enum vchange {
	VCHANGE_FLAGS_FRLOCKS		= 0,
	VCHANGE_FLAGS_ENF_LOCKING	= 1,
	VCHANGE_FLAGS_TRUNCATED		= 2,
	VCHANGE_FLAGS_PAGE_DIRTY	= 3,
	VCHANGE_FLAGS_IOEXCL_COUNT	= 4
} vchange_t;


typedef int	(*vop_open_t)(bhv_desc_t *, struct cred *);
typedef ssize_t (*vop_read_t)(bhv_desc_t *, struct kiocb *,
				const struct iovec *, unsigned int,
				loff_t *, int, struct cred *);
typedef ssize_t (*vop_write_t)(bhv_desc_t *, struct kiocb *,
				const struct iovec *, unsigned int,
				loff_t *, int, struct cred *);
typedef ssize_t (*vop_sendfile_t)(bhv_desc_t *, struct file *,
				loff_t *, int, size_t, read_actor_t,
				void *, struct cred *);
typedef int	(*vop_ioctl_t)(bhv_desc_t *, struct inode *, struct file *,
				int, unsigned int, void __user *);
typedef int	(*vop_getattr_t)(bhv_desc_t *, struct vattr *, int,
				struct cred *);
typedef int	(*vop_setattr_t)(bhv_desc_t *, struct vattr *, int,
				struct cred *);
typedef int	(*vop_access_t)(bhv_desc_t *, int, struct cred *);
typedef int	(*vop_lookup_t)(bhv_desc_t *, vname_t *, vnode_t **,
				int, vnode_t *, struct cred *);
typedef int	(*vop_create_t)(bhv_desc_t *, vname_t *, struct vattr *,
				vnode_t **, struct cred *);
typedef int	(*vop_remove_t)(bhv_desc_t *, vname_t *, struct cred *);
typedef int	(*vop_link_t)(bhv_desc_t *, vnode_t *, vname_t *,
				struct cred *);
typedef int	(*vop_rename_t)(bhv_desc_t *, vname_t *, vnode_t *, vname_t *,
				struct cred *);
typedef int	(*vop_mkdir_t)(bhv_desc_t *, vname_t *, struct vattr *,
				vnode_t **, struct cred *);
typedef int	(*vop_rmdir_t)(bhv_desc_t *, vname_t *, struct cred *);
typedef int	(*vop_readdir_t)(bhv_desc_t *, struct uio *, struct cred *,
				int *);
typedef int	(*vop_symlink_t)(bhv_desc_t *, vname_t *, struct vattr *,
				char *, vnode_t **, struct cred *);
typedef int	(*vop_readlink_t)(bhv_desc_t *, struct uio *, int,
				struct cred *);
typedef int	(*vop_fsync_t)(bhv_desc_t *, int, struct cred *,
				xfs_off_t, xfs_off_t);
typedef int	(*vop_inactive_t)(bhv_desc_t *, struct cred *);
typedef int	(*vop_fid2_t)(bhv_desc_t *, struct fid *);
typedef int	(*vop_release_t)(bhv_desc_t *);
typedef int	(*vop_rwlock_t)(bhv_desc_t *, vrwlock_t);
typedef void	(*vop_rwunlock_t)(bhv_desc_t *, vrwlock_t);
typedef int	(*vop_bmap_t)(bhv_desc_t *, xfs_off_t, ssize_t, int,
				struct xfs_iomap *, int *);
typedef int	(*vop_reclaim_t)(bhv_desc_t *);
typedef int	(*vop_attr_get_t)(bhv_desc_t *