1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28*0Sstevel@tonic-gate /* All Rights Reserved */ 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate /* 31*0Sstevel@tonic-gate * University Copyright- Copyright (c) 1982, 1986, 1988 32*0Sstevel@tonic-gate * The Regents of the University of California 33*0Sstevel@tonic-gate * All Rights Reserved 34*0Sstevel@tonic-gate * 35*0Sstevel@tonic-gate * University Acknowledgment- Portions of this document are derived from 36*0Sstevel@tonic-gate * software developed by the University of California, Berkeley, and its 37*0Sstevel@tonic-gate * contributors. 38*0Sstevel@tonic-gate */ 39*0Sstevel@tonic-gate 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 42*0Sstevel@tonic-gate 43*0Sstevel@tonic-gate #include <sys/types.h> 44*0Sstevel@tonic-gate #include <sys/t_lock.h> 45*0Sstevel@tonic-gate #include <sys/param.h> 46*0Sstevel@tonic-gate #include <sys/buf.h> 47*0Sstevel@tonic-gate #include <sys/cmn_err.h> 48*0Sstevel@tonic-gate #include <sys/debug.h> 49*0Sstevel@tonic-gate #include <sys/errno.h> 50*0Sstevel@tonic-gate #include <sys/vfs.h> 51*0Sstevel@tonic-gate #include <sys/swap.h> 52*0Sstevel@tonic-gate #include <sys/vnode.h> 53*0Sstevel@tonic-gate #include <sys/cred.h> 54*0Sstevel@tonic-gate #include <sys/fs/snode.h> 55*0Sstevel@tonic-gate #include <sys/thread.h> 56*0Sstevel@tonic-gate 57*0Sstevel@tonic-gate #include <fs/fs_subr.h> 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate /* 60*0Sstevel@tonic-gate * This is the loadable module wrapper. 61*0Sstevel@tonic-gate */ 62*0Sstevel@tonic-gate #include <sys/modctl.h> 63*0Sstevel@tonic-gate 64*0Sstevel@tonic-gate static vfsdef_t vfw = { 65*0Sstevel@tonic-gate VFSDEF_VERSION, 66*0Sstevel@tonic-gate "specfs", 67*0Sstevel@tonic-gate specinit, 68*0Sstevel@tonic-gate 0, 69*0Sstevel@tonic-gate NULL 70*0Sstevel@tonic-gate }; 71*0Sstevel@tonic-gate 72*0Sstevel@tonic-gate extern struct mod_ops mod_fsops; 73*0Sstevel@tonic-gate 74*0Sstevel@tonic-gate /* 75*0Sstevel@tonic-gate * Module linkage information for the kernel. 76*0Sstevel@tonic-gate */ 77*0Sstevel@tonic-gate static struct modlfs modlfs = { 78*0Sstevel@tonic-gate &mod_fsops, "filesystem for specfs", &vfw 79*0Sstevel@tonic-gate }; 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate static struct modlinkage modlinkage = { 82*0Sstevel@tonic-gate MODREV_1, (void *)&modlfs, NULL 83*0Sstevel@tonic-gate }; 84*0Sstevel@tonic-gate 85*0Sstevel@tonic-gate int 86*0Sstevel@tonic-gate _init(void) 87*0Sstevel@tonic-gate { 88*0Sstevel@tonic-gate return (mod_install(&modlinkage)); 89*0Sstevel@tonic-gate } 90*0Sstevel@tonic-gate 91*0Sstevel@tonic-gate int 92*0Sstevel@tonic-gate _info(struct modinfo *modinfop) 93*0Sstevel@tonic-gate { 94*0Sstevel@tonic-gate return (mod_info(&modlinkage, modinfop)); 95*0Sstevel@tonic-gate } 96*0Sstevel@tonic-gate 97*0Sstevel@tonic-gate /* 98*0Sstevel@tonic-gate * N.B. 99*0Sstevel@tonic-gate * No _fini routine. This module cannot be unloaded once loaded. 100*0Sstevel@tonic-gate * The NO_UNLOAD_STUB in modstub.s must change if this module ever 101*0Sstevel@tonic-gate * is modififed to become unloadable. 102*0Sstevel@tonic-gate */ 103*0Sstevel@tonic-gate 104*0Sstevel@tonic-gate kmutex_t spec_syncbusy; /* initialized in specinit() */ 105*0Sstevel@tonic-gate 106*0Sstevel@tonic-gate /* 107*0Sstevel@tonic-gate * Run though all the snodes and force write-back 108*0Sstevel@tonic-gate * of all dirty pages on the block devices. 109*0Sstevel@tonic-gate */ 110*0Sstevel@tonic-gate /*ARGSUSED*/ 111*0Sstevel@tonic-gate int 112*0Sstevel@tonic-gate spec_sync(struct vfs *vfsp, 113*0Sstevel@tonic-gate short flag, 114*0Sstevel@tonic-gate struct cred *cr) 115*0Sstevel@tonic-gate { 116*0Sstevel@tonic-gate struct snode *sync_list; 117*0Sstevel@tonic-gate register struct snode **spp, *sp, *spnext; 118*0Sstevel@tonic-gate register struct vnode *vp; 119*0Sstevel@tonic-gate 120*0Sstevel@tonic-gate if (mutex_tryenter(&spec_syncbusy) == 0) 121*0Sstevel@tonic-gate return (0); 122*0Sstevel@tonic-gate 123*0Sstevel@tonic-gate if (flag & SYNC_ATTR) { 124*0Sstevel@tonic-gate mutex_exit(&spec_syncbusy); 125*0Sstevel@tonic-gate return (0); 126*0Sstevel@tonic-gate } 127*0Sstevel@tonic-gate mutex_enter(&stable_lock); 128*0Sstevel@tonic-gate sync_list = NULL; 129*0Sstevel@tonic-gate /* 130*0Sstevel@tonic-gate * Find all the snodes that are dirty and add them to the sync_list 131*0Sstevel@tonic-gate */ 132*0Sstevel@tonic-gate for (spp = stable; spp < &stable[STABLESIZE]; spp++) { 133*0Sstevel@tonic-gate for (sp = *spp; sp != NULL; sp = sp->s_next) { 134*0Sstevel@tonic-gate vp = STOV(sp); 135*0Sstevel@tonic-gate /* 136*0Sstevel@tonic-gate * Don't bother sync'ing a vp if it's 137*0Sstevel@tonic-gate * part of a virtual swap device. 138*0Sstevel@tonic-gate */ 139*0Sstevel@tonic-gate if (IS_SWAPVP(vp)) 140*0Sstevel@tonic-gate continue; 141*0Sstevel@tonic-gate 142*0Sstevel@tonic-gate if (vp->v_type == VBLK && vn_has_cached_data(vp)) { 143*0Sstevel@tonic-gate /* 144*0Sstevel@tonic-gate * Prevent vp from going away before we 145*0Sstevel@tonic-gate * we get a chance to do a VOP_PUTPAGE 146*0Sstevel@tonic-gate * via sync_list processing 147*0Sstevel@tonic-gate */ 148*0Sstevel@tonic-gate VN_HOLD(vp); 149*0Sstevel@tonic-gate sp->s_list = sync_list; 150*0Sstevel@tonic-gate sync_list = sp; 151*0Sstevel@tonic-gate } 152*0Sstevel@tonic-gate } 153*0Sstevel@tonic-gate } 154*0Sstevel@tonic-gate mutex_exit(&stable_lock); 155*0Sstevel@tonic-gate /* 156*0Sstevel@tonic-gate * Now write out all the snodes we marked asynchronously. 157*0Sstevel@tonic-gate */ 158*0Sstevel@tonic-gate for (sp = sync_list; sp != NULL; sp = spnext) { 159*0Sstevel@tonic-gate spnext = sp->s_list; 160*0Sstevel@tonic-gate vp = STOV(sp); 161*0Sstevel@tonic-gate (void) VOP_PUTPAGE(vp, (offset_t)0, (uint_t)0, B_ASYNC, cr); 162*0Sstevel@tonic-gate VN_RELE(vp); /* Release our hold on vnode */ 163*0Sstevel@tonic-gate } 164*0Sstevel@tonic-gate mutex_exit(&spec_syncbusy); 165*0Sstevel@tonic-gate return (0); 166*0Sstevel@tonic-gate } 167