1 | /* $NetBSD: genfs_node.h,v 1.21 2013/06/06 02:00:59 dholland 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 | #include <sys/rwlock.h> |
37 | |
38 | struct vm_page; |
39 | struct kauth_cred; |
40 | struct uio; |
41 | struct vnode; |
42 | |
43 | struct genfs_ops { |
44 | void (*gop_size)(struct vnode *, off_t, off_t *, int); |
45 | int (*gop_alloc)(struct vnode *, off_t, off_t, int, |
46 | struct kauth_cred *); |
47 | int (*gop_write)(struct vnode *, struct vm_page **, int, int); |
48 | void (*gop_markupdate)(struct vnode *, int); |
49 | }; |
50 | |
51 | #define GOP_SIZE(vp, size, eobp, flags) \ |
52 | (*VTOG(vp)->g_op->gop_size)((vp), (size), (eobp), (flags)) |
53 | #define GOP_ALLOC(vp, off, len, flags, cred) \ |
54 | (*VTOG(vp)->g_op->gop_alloc)((vp), (off), (len), (flags), (cred)) |
55 | #define GOP_WRITE(vp, pgs, npages, flags) \ |
56 | (*VTOG(vp)->g_op->gop_write)((vp), (pgs), (npages), (flags)) |
57 | |
58 | /* |
59 | * GOP_MARKUPDATE: mark vnode's timestamps for update. |
60 | * |
61 | * => called with v_interlock (and possibly other locks) held. |
62 | * => used for accesses via mmap. |
63 | */ |
64 | |
65 | #define GOP_MARKUPDATE(vp, flags) \ |
66 | (VTOG(vp)->g_op->gop_markupdate) ? \ |
67 | (*VTOG(vp)->g_op->gop_markupdate)((vp), (flags)) : \ |
68 | (void)0; |
69 | |
70 | /* Flags to GOP_SIZE */ |
71 | #define GOP_SIZE_MEM 0x4 /* in-memory size */ |
72 | |
73 | /* Flags to GOP_MARKUPDATE */ |
74 | #define GOP_UPDATE_ACCESSED 1 |
75 | #define GOP_UPDATE_MODIFIED 2 |
76 | |
77 | struct genfs_node { |
78 | const struct genfs_ops *g_op; /* ops vector */ |
79 | krwlock_t g_glock; /* getpages lock */ |
80 | int g_dirtygen; |
81 | }; |
82 | |
83 | #define VTOG(vp) ((struct genfs_node *)(vp)->v_data) |
84 | |
85 | void genfs_size(struct vnode *, off_t, off_t *, int); |
86 | void genfs_node_init(struct vnode *, const struct genfs_ops *); |
87 | void genfs_node_destroy(struct vnode *); |
88 | int genfs_gop_write(struct vnode *, struct vm_page **, int, int); |
89 | int genfs_gop_write_rwmap(struct vnode *, struct vm_page **, int, int); |
90 | int genfs_compat_gop_write(struct vnode *, struct vm_page **, int, int); |
91 | void genfs_directio(struct vnode *, struct uio *, int); |
92 | |
93 | void genfs_node_wrlock(struct vnode *); |
94 | void genfs_node_rdlock(struct vnode *); |
95 | int genfs_node_rdtrylock(struct vnode *); |
96 | void genfs_node_unlock(struct vnode *); |
97 | int genfs_node_wrlocked(struct vnode *); |
98 | |
99 | #endif /* _MISCFS_GENFS_GENFS_NODE_H_ */ |
100 | |