| 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 | |