Expand PMF_FN_* macros.
[netbsd-mini2440.git] / sys / miscfs / syncfs / sync_vnops.c
blob838d7244eaad0a66a7335f81f6c6f3921fde8230
1 /* $NetBSD: sync_vnops.c,v 1.26 2009/02/22 20:10:25 ad Exp $ */
3 /*-
4 * Copyright (c) 2009 The NetBSD Foundation, Inc.
5 * All rights reserved.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
33 * Copyright 1997 Marshall Kirk McKusick. All Rights Reserved.
35 * This code is derived from work done by Greg Ganger at the
36 * University of Michigan.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. None of the names of McKusick, Ganger, or the University of Michigan
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
50 * THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
63 #include <sys/cdefs.h>
64 __KERNEL_RCSID(0, "$NetBSD: sync_vnops.c,v 1.26 2009/02/22 20:10:25 ad Exp $");
66 #include <sys/param.h>
67 #include <sys/proc.h>
68 #include <sys/systm.h>
69 #include <sys/vnode.h>
70 #include <sys/mount.h>
71 #include <sys/errno.h>
73 #include <miscfs/genfs/genfs.h>
74 #include <miscfs/syncfs/syncfs.h>
76 int (**sync_vnodeop_p)(void *);
77 const struct vnodeopv_entry_desc sync_vnodeop_entries[] = {
78 { &vop_default_desc, vn_default_error },
79 { &vop_close_desc, sync_close }, /* close */
80 { &vop_fsync_desc, sync_fsync }, /* fsync */
81 { &vop_inactive_desc, sync_inactive }, /* inactive */
82 { &vop_reclaim_desc, sync_reclaim }, /* reclaim */
83 { &vop_lock_desc, sync_lock }, /* lock */
84 { &vop_unlock_desc, sync_unlock }, /* unlock */
85 { &vop_print_desc, sync_print }, /* print */
86 { &vop_islocked_desc, sync_islocked }, /* islocked */
87 { &vop_putpages_desc, sync_putpages }, /* islocked */
88 { NULL, NULL }
91 const struct vnodeopv_desc sync_vnodeop_opv_desc =
92 { &sync_vnodeop_p, sync_vnodeop_entries };
95 * Return delay factor appropriate for the given file system. For
96 * WAPBL we use the sync vnode to burst out metadata updates: sync
97 * those file systems more frequently.
99 static inline int
100 sync_delay(struct mount *mp)
103 return mp->mnt_wapbl != NULL ? metadelay : syncdelay;
107 * Create a new filesystem syncer vnode for the specified mount point.
110 vfs_allocate_syncvnode(struct mount *mp)
112 struct vnode *vp;
113 static int start, incr, next;
114 int error, vdelay;
116 /* Allocate a new vnode */
117 if ((error = getnewvnode(VT_VFS, mp, sync_vnodeop_p, &vp)) != 0)
118 return (error);
120 vp->v_writecount = 1;
121 vp->v_type = VNON;
124 * Place the vnode onto the syncer worklist. We attempt to
125 * scatter them about on the list so that they will go off
126 * at evenly distributed times even if all the filesystems
127 * are mounted at once.
130 next += incr;
131 if (next == 0 || next > syncer_maxdelay) {
132 start /= 2;
133 incr /= 2;
134 if (start == 0) {
135 start = syncer_maxdelay / 2;
136 incr = syncer_maxdelay;
138 next = start;
140 mutex_enter(&vp->v_interlock);
141 vdelay = sync_delay(mp);
142 vn_syncer_add_to_worklist(vp, vdelay > 0 ? next % vdelay : 0);
143 mutex_exit(&vp->v_interlock);
144 mp->mnt_syncer = vp;
145 return (0);
149 * Destroy the filesystem syncer vnode for the specified mount point.
151 void
152 vfs_deallocate_syncvnode(struct mount *mp)
154 struct vnode *vp;
156 vp = mp->mnt_syncer;
157 mp->mnt_syncer = NULL;
158 mutex_enter(&vp->v_interlock);
159 vn_syncer_remove_from_worklist(vp);
160 vp->v_writecount = 0;
161 mutex_exit(&vp->v_interlock);
162 vgone(vp);
166 * Do a lazy sync of the filesystem.
169 sync_fsync(void *v)
171 struct vop_fsync_args /* {
172 struct vnode *a_vp;
173 kauth_cred_t a_cred;
174 int a_flags;
175 off_t offlo;
176 off_t offhi;
177 } */ *ap = v;
178 struct vnode *syncvp = ap->a_vp;
179 struct mount *mp = syncvp->v_mount;
182 * We only need to do something if this is a lazy evaluation.
184 if (!(ap->a_flags & FSYNC_LAZY))
185 return (0);
188 * Move ourselves to the back of the sync list.
190 mutex_enter(&syncvp->v_interlock);
191 vn_syncer_add_to_worklist(syncvp, sync_delay(mp));
192 mutex_exit(&syncvp->v_interlock);
195 * Walk the list of vnodes pushing all that are dirty and
196 * not already on the sync list.
198 if (vfs_busy(mp, NULL) == 0) {
199 VFS_SYNC(mp, MNT_LAZY, ap->a_cred);
200 vfs_unbusy(mp, false, NULL);
202 return (0);
206 * The syncer vnode is no longer needed and is being decommissioned.
209 sync_inactive(void *v)
211 struct vop_inactive_args /* {
212 struct vnode *a_vp;
213 struct proc *a_p;
214 } */ *ap = v;
215 struct vnode *vp = ap->a_vp;
217 VOP_UNLOCK(vp, 0);
218 return (0);
222 sync_reclaim(void *v)
225 return (0);
229 * Print out a syncer vnode.
232 sync_print(void *v)
235 printf("syncer vnode\n");
236 return (0);