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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#include <sys/types.h>
#include <sys/t_lock.h>
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/cmn_err.h>
#include <sys/debug.h>
#include <sys/errno.h>
#include <sys/vfs.h>
#include <sys/swap.h>
#include <sys/vnode.h>
#include <sys/cred.h>
#include <sys/fs/snode.h>
#include <sys/thread.h>
#include <fs/fs_subr.h>
/*
* This is the loadable module wrapper.
*/
#include <sys/modctl.h>
static vfsdef_t vfw = {
VFSDEF_VERSION,
"specfs",
specinit,
VSW_ZMOUNT,
NULL
};
extern struct mod_ops mod_fsops;
/*
* Module linkage information for the kernel.
*/
static struct modlfs modlfs = {
&mod_fsops, "filesystem for specfs", &vfw
};
static struct modlinkage modlinkage = {
MODREV_1, (void *)&modlfs, NULL
};
int
_init(void)
{
return (mod_install(&modlinkage));
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&modlinkage, modinfop));
}
/*
* N.B.
* No _fini routine. This module cannot be unloaded once loaded.
* The NO_UNLOAD_STUB in modstub.s must change if this module ever
* is modified to become unloadable.
*/
kmutex_t spec_syncbusy; /* initialized in specinit() */
/*
* Run though all the snodes and force write-back
* of all dirty pages on the block devices.
*/
/*ARGSUSED*/
int
spec_sync(struct vfs *vfsp,
short flag,
struct cred *cr)
{
struct snode *sync_list;
register struct snode **spp, *sp, *spnext;
register struct vnode *vp;
if (mutex_tryenter(&spec_syncbusy) == 0)
return (0);
if (flag & SYNC_ATTR) {
mutex_exit(&spec_syncbusy);
return (0);
}
mutex_enter(&stable_lock);
sync_list = NULL;
/*
* Find all the snodes that are dirty and add them to the sync_list
*/
for (spp = stable; spp < &stable[STABLESIZE]; spp++) {
for (sp = *spp; sp != NULL; sp = sp->s_next) {
vp = STOV(sp);
/*
* Don't bother sync'ing a vp if it's
* part of a virtual swap device.
*/
if (IS_SWAPVP(vp))
continue;
if (vp->v_type == VBLK && vn_has_cached_data(vp)) {
/*
* Prevent vp from going away before we
* we get a chance to do a VOP_PUTPAGE
* via sync_list processing
*/
VN_HOLD(vp);
sp->s_list = sync_list;
sync_list = sp;
}
}
}
mutex_exit(&stable_lock);
/*
* Now write out all the snodes we marked asynchronously.
*/
for (sp = sync_list; sp != NULL; sp = spnext) {
spnext = sp->s_list;
vp = STOV(sp);
(void) VOP_PUTPAGE(vp, (offset_t)0, (uint_t)0, B_ASYNC, cr,
NULL);
VN_RELE(vp); /* Release our hold on vnode */
}
mutex_exit(&spec_syncbusy);
return (0);
}
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