239 lines
6.8 KiB
C
239 lines
6.8 KiB
C
/* $NetBSD: sync_vnops.c,v 1.29 2011/06/12 03:35:58 rmind Exp $ */
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/*-
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* Copyright (c) 2009 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright 1997 Marshall Kirk McKusick. All Rights Reserved.
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*
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* This code is derived from work done by Greg Ganger at the
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* University of Michigan.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. None of the names of McKusick, Ganger, or the University of Michigan
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: sync_vnops.c,v 1.29 2011/06/12 03:35:58 rmind Exp $");
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/errno.h>
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#include <miscfs/genfs/genfs.h>
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#include <miscfs/syncfs/syncfs.h>
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int (**sync_vnodeop_p)(void *);
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const struct vnodeopv_entry_desc sync_vnodeop_entries[] = {
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{ &vop_default_desc, vn_default_error },
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{ &vop_close_desc, sync_close }, /* close */
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{ &vop_fsync_desc, sync_fsync }, /* fsync */
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{ &vop_inactive_desc, sync_inactive }, /* inactive */
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{ &vop_reclaim_desc, sync_reclaim }, /* reclaim */
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{ &vop_lock_desc, sync_lock }, /* lock */
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{ &vop_unlock_desc, sync_unlock }, /* unlock */
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{ &vop_print_desc, sync_print }, /* print */
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{ &vop_islocked_desc, sync_islocked }, /* islocked */
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{ &vop_putpages_desc, sync_putpages }, /* islocked */
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{ NULL, NULL }
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};
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const struct vnodeopv_desc sync_vnodeop_opv_desc =
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{ &sync_vnodeop_p, sync_vnodeop_entries };
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/*
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* Return delay factor appropriate for the given file system. For
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* WAPBL we use the sync vnode to burst out metadata updates: sync
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* those file systems more frequently.
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*/
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static inline int
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sync_delay(struct mount *mp)
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{
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return mp->mnt_wapbl != NULL ? metadelay : syncdelay;
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}
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/*
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* Create a new filesystem syncer vnode for the specified mount point.
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*/
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int
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vfs_allocate_syncvnode(struct mount *mp)
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{
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struct vnode *vp;
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static int start, incr, next;
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int error, vdelay;
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/* Allocate a new vnode */
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error = getnewvnode(VT_VFS, mp, sync_vnodeop_p, NULL, &vp);
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if (error) {
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return error;
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}
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vp->v_writecount = 1;
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vp->v_type = VNON;
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/*
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* Place the vnode onto the syncer worklist. We attempt to
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* scatter them about on the list so that they will go off
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* at evenly distributed times even if all the filesystems
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* are mounted at once.
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*/
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next += incr;
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if (next == 0 || next > syncer_maxdelay) {
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start /= 2;
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incr /= 2;
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if (start == 0) {
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start = syncer_maxdelay / 2;
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incr = syncer_maxdelay;
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}
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next = start;
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}
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mutex_enter(vp->v_interlock);
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vdelay = sync_delay(mp);
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vn_syncer_add_to_worklist(vp, vdelay > 0 ? next % vdelay : 0);
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mutex_exit(vp->v_interlock);
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mp->mnt_syncer = vp;
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return (0);
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}
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/*
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* Destroy the filesystem syncer vnode for the specified mount point.
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*/
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void
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vfs_deallocate_syncvnode(struct mount *mp)
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{
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struct vnode *vp;
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vp = mp->mnt_syncer;
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mp->mnt_syncer = NULL;
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mutex_enter(vp->v_interlock);
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vn_syncer_remove_from_worklist(vp);
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vp->v_writecount = 0;
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mutex_exit(vp->v_interlock);
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vgone(vp);
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}
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/*
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* Do a lazy sync of the filesystem.
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*/
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int
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sync_fsync(void *v)
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{
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struct vop_fsync_args /* {
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struct vnode *a_vp;
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kauth_cred_t a_cred;
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int a_flags;
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off_t offlo;
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off_t offhi;
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} */ *ap = v;
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struct vnode *syncvp = ap->a_vp;
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struct mount *mp = syncvp->v_mount;
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/*
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* We only need to do something if this is a lazy evaluation.
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*/
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if (!(ap->a_flags & FSYNC_LAZY))
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return (0);
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/*
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* Move ourselves to the back of the sync list.
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*/
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mutex_enter(syncvp->v_interlock);
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vn_syncer_add_to_worklist(syncvp, sync_delay(mp));
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mutex_exit(syncvp->v_interlock);
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/*
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* Walk the list of vnodes pushing all that are dirty and
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* not already on the sync list.
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*/
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if (vfs_busy(mp, NULL) == 0) {
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VFS_SYNC(mp, MNT_LAZY, ap->a_cred);
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vfs_unbusy(mp, false, NULL);
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}
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return (0);
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}
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/*
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* The syncer vnode is no longer needed and is being decommissioned.
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*/
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int
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sync_inactive(void *v)
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{
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct proc *a_p;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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VOP_UNLOCK(vp);
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return (0);
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}
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int
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sync_reclaim(void *v)
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{
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return (0);
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}
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/*
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* Print out a syncer vnode.
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*/
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int
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sync_print(void *v)
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{
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printf("syncer vnode\n");
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return (0);
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}
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