ufs_vfsops.c revision 186278
1/*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 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. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)ufs_vfsops.c 8.8 (Berkeley) 5/20/95 35 */ 36 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: head/sys/ufs/ufs/ufs_vfsops.c 186278 2008-12-18 12:01:53Z kib $"); 39 40#include "opt_quota.h" 41#include "opt_ufs.h" 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/kernel.h> 46#include <sys/lock.h> 47#include <sys/malloc.h> 48#include <sys/mount.h> 49#include <sys/proc.h> 50#include <sys/socket.h> 51#include <sys/vnode.h> 52 53#include <ufs/ufs/extattr.h> 54#include <ufs/ufs/quota.h> 55#include <ufs/ufs/inode.h> 56#include <ufs/ufs/ufsmount.h> 57#include <ufs/ufs/ufs_extern.h> 58#ifdef UFS_DIRHASH 59#include <ufs/ufs/dir.h> 60#include <ufs/ufs/dirhash.h> 61#endif 62 63MALLOC_DEFINE(M_UFSMNT, "ufs_mount", "UFS mount structure"); 64 65/* 66 * Return the root of a filesystem. 67 */ 68int 69ufs_root(mp, flags, vpp, td) 70 struct mount *mp; 71 int flags; 72 struct vnode **vpp; 73 struct thread *td; 74{ 75 struct vnode *nvp; 76 int error; 77 78 error = VFS_VGET(mp, (ino_t)ROOTINO, flags, &nvp); 79 if (error) 80 return (error); 81 *vpp = nvp; 82 return (0); 83} 84 85/* 86 * Do operations associated with quotas 87 */ 88int 89ufs_quotactl(mp, cmds, id, arg, td) 90 struct mount *mp; 91 int cmds; 92 uid_t id; 93 void *arg; 94 struct thread *td; 95{ 96#ifndef QUOTA 97 return (EOPNOTSUPP); 98#else 99 int cmd, type, error; 100 101 cmd = cmds >> SUBCMDSHIFT; 102 type = cmds & SUBCMDMASK; 103 if (id == -1) { 104 switch (type) { 105 106 case USRQUOTA: 107 id = td->td_ucred->cr_ruid; 108 break; 109 110 case GRPQUOTA: 111 id = td->td_ucred->cr_rgid; 112 break; 113 114 default: 115 return (EINVAL); 116 } 117 } 118 if ((u_int)type >= MAXQUOTAS) 119 return (EINVAL); 120 121 switch (cmd) { 122 case Q_QUOTAON: 123 error = quotaon(td, mp, type, arg); 124 break; 125 126 case Q_QUOTAOFF: 127 error = quotaoff(td, mp, type); 128 break; 129 130 case Q_SETQUOTA: 131 error = setquota(td, mp, id, type, arg); 132 break; 133 134 case Q_SETUSE: 135 error = setuse(td, mp, id, type, arg); 136 break; 137 138 case Q_GETQUOTA: 139 error = getquota(td, mp, id, type, arg); 140 break; 141 142 case Q_SYNC: 143 error = qsync(mp); 144 break; 145 146 default: 147 error = EINVAL; 148 break; 149 } 150 return (error); 151#endif 152} 153 154/* 155 * Initial UFS filesystems, done only once. 156 */ 157int 158ufs_init(vfsp) 159 struct vfsconf *vfsp; 160{ 161 162#ifdef QUOTA 163 dqinit(); 164#endif 165#ifdef UFS_DIRHASH 166 ufsdirhash_init(); 167#endif 168 return (0); 169} 170 171/* 172 * Uninitialise UFS filesystems, done before module unload. 173 */ 174int 175ufs_uninit(vfsp) 176 struct vfsconf *vfsp; 177{ 178 179#ifdef QUOTA 180 dquninit(); 181#endif 182#ifdef UFS_DIRHASH 183 ufsdirhash_uninit(); 184#endif 185 return (0); 186} 187 188/* 189 * This is the generic part of fhtovp called after the underlying 190 * filesystem has validated the file handle. 191 * 192 * Call the VFS_CHECKEXP beforehand to verify access. 193 */ 194int 195ufs_fhtovp(mp, ufhp, vpp) 196 struct mount *mp; 197 struct ufid *ufhp; 198 struct vnode **vpp; 199{ 200 struct inode *ip; 201 struct vnode *nvp; 202 int error; 203 204 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 205 if (error) { 206 *vpp = NULLVP; 207 return (error); 208 } 209 ip = VTOI(nvp); 210 if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen || 211 ip->i_effnlink <= 0) { 212 vput(nvp); 213 *vpp = NULLVP; 214 return (ESTALE); 215 } 216 *vpp = nvp; 217 vnode_create_vobject(*vpp, DIP(ip, i_size), curthread); 218 return (0); 219} 220