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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)ufs_vfsops.c 8.8 (Berkeley) 5/20/95 39 * $FreeBSD: src/sys/ufs/ufs/ufs_vfsops.c,v 1.17.2.3 2001/10/14 19:08:16 iedowse Exp $ 40 * $DragonFly: src/sys/vfs/ufs/ufs_vfsops.c,v 1.5 2003/08/07 21:17:44 dillon Exp $ 41 */ 42 43 #include "opt_quota.h" 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/mount.h> 48 #include <sys/proc.h> 49 #include <sys/malloc.h> 50 #include <sys/vnode.h> 51 52 #include "quota.h" 53 #include "inode.h" 54 #include "ufsmount.h" 55 #include "ufs_extern.h" 56 57 MALLOC_DEFINE(M_UFSMNT, "UFS mount", "UFS mount structure"); 58 /* 59 * Make a filesystem operational. 60 * Nothing to do at the moment. 61 */ 62 /* ARGSUSED */ 63 int 64 ufs_start(struct mount *mp, int flags, struct thread *td) 65 { 66 return (0); 67 } 68 69 /* 70 * Return the root of a filesystem. 71 */ 72 int 73 ufs_root(mp, vpp) 74 struct mount *mp; 75 struct vnode **vpp; 76 { 77 struct vnode *nvp; 78 int error; 79 80 error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp); 81 if (error) 82 return (error); 83 *vpp = nvp; 84 return (0); 85 } 86 87 /* 88 * Do operations associated with quotas 89 */ 90 int 91 ufs_quotactl(mp, cmds, uid, arg, td) 92 struct mount *mp; 93 int cmds; 94 uid_t uid; 95 caddr_t arg; 96 struct thread *td; 97 { 98 #ifndef QUOTA 99 return (EOPNOTSUPP); 100 #else 101 struct proc *p = td->td_proc; 102 int cmd, type, error; 103 104 if (p == NULL) 105 return (EOPNOTSUPP); 106 107 if (uid == -1) 108 uid = p->p_ucred->cr_ruid; 109 cmd = cmds >> SUBCMDSHIFT; 110 111 switch (cmd) { 112 case Q_SYNC: 113 break; 114 case Q_GETQUOTA: 115 if (uid == p->p_ucred->cr_ruid) 116 break; 117 /* fall through */ 118 default: 119 if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0) 120 return (error); 121 } 122 123 type = cmds & SUBCMDMASK; 124 if ((u_int)type >= MAXQUOTAS) 125 return (EINVAL); 126 if (vfs_busy(mp, LK_NOWAIT, 0, td)) 127 return (0); 128 129 switch (cmd) { 130 131 case Q_QUOTAON: 132 error = quotaon(td, mp, type, arg); 133 break; 134 135 case Q_QUOTAOFF: 136 error = quotaoff(td, mp, type); 137 break; 138 139 case Q_SETQUOTA: 140 error = setquota(mp, uid, type, arg); 141 break; 142 143 case Q_SETUSE: 144 error = setuse(mp, uid, type, arg); 145 break; 146 147 case Q_GETQUOTA: 148 error = getquota(mp, uid, type, arg); 149 break; 150 151 case Q_SYNC: 152 error = qsync(mp); 153 break; 154 155 default: 156 error = EINVAL; 157 break; 158 } 159 vfs_unbusy(mp, td); 160 return (error); 161 #endif 162 } 163 164 /* 165 * Initial UFS filesystems, done only once. 166 */ 167 int 168 ufs_init(vfsp) 169 struct vfsconf *vfsp; 170 { 171 static int done; 172 173 if (done) 174 return (0); 175 done = 1; 176 ufs_ihashinit(); 177 #ifdef QUOTA 178 dqinit(); 179 #endif 180 return (0); 181 } 182 183 /* 184 * This is the generic part of fhtovp called after the underlying 185 * filesystem has validated the file handle. 186 * 187 * Call the VFS_CHECKEXP beforehand to verify access. 188 */ 189 int 190 ufs_fhtovp(mp, ufhp, vpp) 191 struct mount *mp; 192 struct ufid *ufhp; 193 struct vnode **vpp; 194 { 195 struct inode *ip; 196 struct vnode *nvp; 197 int error; 198 199 error = VFS_VGET(mp, ufhp->ufid_ino, &nvp); 200 if (error) { 201 *vpp = NULLVP; 202 return (error); 203 } 204 ip = VTOI(nvp); 205 if (ip->i_mode == 0 || 206 ip->i_gen != ufhp->ufid_gen || 207 (VFSTOUFS(mp)->um_i_effnlink_valid ? ip->i_effnlink : 208 ip->i_nlink) <= 0) { 209 vput(nvp); 210 *vpp = NULLVP; 211 return (ESTALE); 212 } 213 *vpp = nvp; 214 return (0); 215 } 216 217 218 /* 219 * This is the generic part of fhtovp called after the underlying 220 * filesystem has validated the file handle. 221 * 222 * Verify that a host should have access to a filesystem. 223 */ 224 int 225 ufs_check_export(mp, nam, exflagsp, credanonp) 226 struct mount *mp; 227 struct sockaddr *nam; 228 int *exflagsp; 229 struct ucred **credanonp; 230 { 231 struct netcred *np; 232 struct ufsmount *ump;; 233 234 ump = VFSTOUFS(mp); 235 /* 236 * Get the export permission structure for this <mp, client> tuple. 237 */ 238 np = vfs_export_lookup(mp, &ump->um_export, nam); 239 if (np == NULL) 240 return (EACCES); 241 242 *exflagsp = np->netc_exflags; 243 *credanonp = &np->netc_anon; 244 return (0); 245 } 246