1 /* $NetBSD: ufs_vfsops.c,v 1.13 2001/11/08 02:39:17 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)ufs_vfsops.c 8.8 (Berkeley) 5/20/95 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: ufs_vfsops.c,v 1.13 2001/11/08 02:39:17 lukem Exp $"); 45 46 #include "opt_quota.h" 47 48 #include <sys/param.h> 49 #include <sys/mbuf.h> 50 #include <sys/mount.h> 51 #include <sys/proc.h> 52 #include <sys/buf.h> 53 #include <sys/vnode.h> 54 #include <sys/malloc.h> 55 56 #include <miscfs/specfs/specdev.h> 57 58 #include <ufs/ufs/quota.h> 59 #include <ufs/ufs/inode.h> 60 #include <ufs/ufs/ufsmount.h> 61 #include <ufs/ufs/ufs_extern.h> 62 63 /* how many times ufs_init() was called */ 64 int ufs_initcount = 0; 65 66 /* 67 * Make a filesystem operational. 68 * Nothing to do at the moment. 69 */ 70 /* ARGSUSED */ 71 int 72 ufs_start(mp, flags, p) 73 struct mount *mp; 74 int flags; 75 struct proc *p; 76 { 77 78 return (0); 79 } 80 81 /* 82 * Return the root of a filesystem. 83 */ 84 int 85 ufs_root(mp, vpp) 86 struct mount *mp; 87 struct vnode **vpp; 88 { 89 struct vnode *nvp; 90 int error; 91 92 if ((error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp)) != 0) 93 return (error); 94 *vpp = nvp; 95 return (0); 96 } 97 98 /* 99 * Do operations associated with quotas 100 */ 101 int 102 ufs_quotactl(mp, cmds, uid, arg, p) 103 struct mount *mp; 104 int cmds; 105 uid_t uid; 106 caddr_t arg; 107 struct proc *p; 108 { 109 110 #ifndef QUOTA 111 return (EOPNOTSUPP); 112 #else 113 int cmd, type, error; 114 115 if (uid == -1) 116 uid = p->p_cred->p_ruid; 117 cmd = cmds >> SUBCMDSHIFT; 118 119 switch (cmd) { 120 case Q_SYNC: 121 break; 122 case Q_GETQUOTA: 123 if (uid == p->p_cred->p_ruid) 124 break; 125 /* fall through */ 126 default: 127 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 128 return (error); 129 } 130 131 type = cmds & SUBCMDMASK; 132 if ((u_int)type >= MAXQUOTAS) 133 return (EINVAL); 134 if (vfs_busy(mp, LK_NOWAIT, 0)) 135 return (0); 136 137 switch (cmd) { 138 139 case Q_QUOTAON: 140 error = quotaon(p, mp, type, arg); 141 break; 142 143 case Q_QUOTAOFF: 144 error = quotaoff(p, mp, type); 145 break; 146 147 case Q_SETQUOTA: 148 error = setquota(mp, uid, type, arg); 149 break; 150 151 case Q_SETUSE: 152 error = setuse(mp, uid, type, arg); 153 break; 154 155 case Q_GETQUOTA: 156 error = getquota(mp, uid, type, arg); 157 break; 158 159 case Q_SYNC: 160 error = qsync(mp); 161 break; 162 163 default: 164 error = EINVAL; 165 } 166 vfs_unbusy(mp); 167 return (error); 168 #endif 169 } 170 171 /* 172 * Verify a remote client has export rights and return these rights via. 173 * exflagsp and credanonp. 174 */ 175 int 176 ufs_check_export(mp, nam, exflagsp, credanonp) 177 struct mount *mp; 178 struct mbuf *nam; 179 int *exflagsp; 180 struct ucred **credanonp; 181 { 182 struct netcred *np; 183 struct ufsmount *ump = VFSTOUFS(mp); 184 185 /* 186 * Get the export permission structure for this <mp, client> tuple. 187 */ 188 np = vfs_export_lookup(mp, &ump->um_export, nam); 189 if (np == NULL) 190 return (EACCES); 191 192 *exflagsp = np->netc_exflags; 193 *credanonp = &np->netc_anon; 194 return (0); 195 } 196 197 /* 198 * This is the generic part of fhtovp called after the underlying 199 * filesystem has validated the file handle. 200 */ 201 int 202 ufs_fhtovp(mp, ufhp, vpp) 203 struct mount *mp; 204 struct ufid *ufhp; 205 struct vnode **vpp; 206 { 207 struct vnode *nvp; 208 struct inode *ip; 209 int error; 210 211 if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) { 212 *vpp = NULLVP; 213 return (error); 214 } 215 ip = VTOI(nvp); 216 if (ip->i_ffs_mode == 0 || ip->i_ffs_gen != ufhp->ufid_gen) { 217 vput(nvp); 218 *vpp = NULLVP; 219 return (ESTALE); 220 } 221 *vpp = nvp; 222 return (0); 223 } 224 225 /* 226 * Initialize UFS filesystems, done only once. 227 */ 228 void 229 ufs_init() 230 { 231 if (ufs_initcount++ > 0) 232 return; 233 234 ufs_ihashinit(); 235 #ifdef QUOTA 236 dqinit(); 237 #endif 238 } 239 240 void 241 ufs_reinit() 242 { 243 ufs_ihashreinit(); 244 #ifdef QUOTA 245 dqreinit(); 246 #endif 247 } 248 249 /* 250 * Free UFS filesystem resources, done only once. 251 */ 252 void 253 ufs_done() 254 { 255 if (--ufs_initcount > 0) 256 return; 257 258 ufs_ihashdone(); 259 #ifdef QUOTA 260 dqdone(); 261 #endif 262 } 263