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genfs_node.h revision 1.8 
      1 /* $NetBSD: genfs_node.h,v 1.8 2005/07/23 12:18:41 yamt Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2001 Chuck Silvers.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Chuck Silvers.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #ifndef	_MISCFS_GENFS_GENFS_NODE_H_
     34 #define	_MISCFS_GENFS_GENFS_NODE_H_
     35 
     36 struct vm_page;
     37 
     38 struct genfs_ops {
     39 	void	(*gop_size)(struct vnode *, off_t, off_t *, int);
     40 	int	(*gop_alloc)(struct vnode *, off_t, off_t, int, struct ucred *);
     41 	int	(*gop_write)(struct vnode *, struct vm_page **, int, int);
     42 	void	(*gop_markupdate)(struct vnode *, int);
     43 };
     44 
     45 #define GOP_SIZE(vp, size, eobp, flags) \
     46 	(*VTOG(vp)->g_op->gop_size)((vp), (size), (eobp), (flags))
     47 #define GOP_ALLOC(vp, off, len, flags, cred) \
     48 	(*VTOG(vp)->g_op->gop_alloc)((vp), (off), (len), (flags), (cred))
     49 #define GOP_WRITE(vp, pgs, npages, flags) \
     50 	(*VTOG(vp)->g_op->gop_write)((vp), (pgs), (npages), (flags))
     51 
     52 /*
     53  * GOP_MARKUPDATE: mark vnode's timestamps for update.
     54  *
     55  * => called with v_interlock (and possibly other locks) held.
     56  * => used for accesses via mmap.
     57  */
     58 
     59 #define GOP_MARKUPDATE(vp, flags) \
     60 	(VTOG(vp)->g_op->gop_markupdate) ? \
     61 	(*VTOG(vp)->g_op->gop_markupdate)((vp), (flags)) : \
     62 	(void)0;
     63 
     64 /* Flags to GOP_SIZE */
     65 #define	GOP_SIZE_READ	0x1	/* Advise how many pages to read */
     66 #define	GOP_SIZE_WRITE	0x2	/* Tell how many pages to write */
     67 #define	GOP_SIZE_MEM	0x4	/* in-memory size */
     68 
     69 /* Flags to GOP_MARKUPDATE */
     70 #define	GOP_UPDATE_ACCESSED	1
     71 #define	GOP_UPDATE_MODIFIED	2
     72 
     73 struct genfs_node {
     74 	const struct genfs_ops	*g_op;		/* ops vector */
     75 	struct lock		g_glock;	/* getpages lock */
     76 	int			g_dirtygen;
     77 };
     78 
     79 #define VTOG(vp) ((struct genfs_node *)(vp)->v_data)
     80 
     81 void	genfs_size(struct vnode *, off_t, off_t *, int);
     82 void	genfs_node_init(struct vnode *, const struct genfs_ops *);
     83 int	genfs_gop_write(struct vnode *, struct vm_page **, int, int);
     84 int	genfs_compat_gop_write(struct vnode *, struct vm_page **, int, int);
     85 
     86 #endif	/* _MISCFS_GENFS_GENFS_NODE_H_ */
     87