1 /* $NetBSD: genfs_node.h,v 1.14 2006/10/14 09:16:28 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 struct kauth_cred; 38 struct uio; 39 40 struct genfs_ops { 41 void (*gop_size)(struct vnode *, off_t, off_t *, int); 42 int (*gop_alloc)(struct vnode *, off_t, off_t, int, 43 struct kauth_cred *); 44 int (*gop_write)(struct vnode *, struct vm_page **, int, int); 45 void (*gop_markupdate)(struct vnode *, int); 46 }; 47 48 #define GOP_SIZE(vp, size, eobp, flags) \ 49 (*VTOG(vp)->g_op->gop_size)((vp), (size), (eobp), (flags)) 50 #define GOP_ALLOC(vp, off, len, flags, cred) \ 51 (*VTOG(vp)->g_op->gop_alloc)((vp), (off), (len), (flags), (cred)) 52 #define GOP_WRITE(vp, pgs, npages, flags) \ 53 (*VTOG(vp)->g_op->gop_write)((vp), (pgs), (npages), (flags)) 54 55 /* 56 * GOP_MARKUPDATE: mark vnode's timestamps for update. 57 * 58 * => called with v_interlock (and possibly other locks) held. 59 * => used for accesses via mmap. 60 */ 61 62 #define GOP_MARKUPDATE(vp, flags) \ 63 (VTOG(vp)->g_op->gop_markupdate) ? \ 64 (*VTOG(vp)->g_op->gop_markupdate)((vp), (flags)) : \ 65 (void)0; 66 67 /* Flags to GOP_SIZE */ 68 #define GOP_SIZE_MEM 0x4 /* in-memory size */ 69 70 /* Flags to GOP_MARKUPDATE */ 71 #define GOP_UPDATE_ACCESSED 1 72 #define GOP_UPDATE_MODIFIED 2 73 74 struct genfs_node { 75 const struct genfs_ops *g_op; /* ops vector */ 76 struct lock g_glock; /* getpages lock */ 77 int g_dirtygen; 78 }; 79 80 #define VTOG(vp) ((struct genfs_node *)(vp)->v_data) 81 82 void genfs_size(struct vnode *, off_t, off_t *, int); 83 void genfs_node_init(struct vnode *, const struct genfs_ops *); 84 int genfs_gop_write(struct vnode *, struct vm_page **, int, int); 85 int genfs_compat_gop_write(struct vnode *, struct vm_page **, int, int); 86 void genfs_directio(struct vnode *, struct uio *, int); 87 88 void genfs_node_wrlock(struct vnode *); 89 void genfs_node_rdlock(struct vnode *); 90 void genfs_node_unlock(struct vnode *); 91 92 #endif /* _MISCFS_GENFS_GENFS_NODE_H_ */ 93