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 1.9 2004/07/18 19:43:48 drhodus 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(struct mount *mp, struct vnode **vpp) 74 { 75 struct vnode *nvp; 76 int error; 77 78 error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp); 79 if (error) 80 return (error); 81 *vpp = nvp; 82 return (0); 83 } 84 85 /* 86 * Do operations associated with quotas 87 */ 88 int 89 ufs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 90 struct thread *td) 91 { 92 #ifndef QUOTA 93 return (EOPNOTSUPP); 94 #else 95 struct proc *p = td->td_proc; 96 int cmd, type, error; 97 98 if (p == NULL) 99 return (EOPNOTSUPP); 100 101 type = cmds & SUBCMDMASK; 102 cmd = cmds >> SUBCMDSHIFT; 103 104 if (uid == -1) { 105 switch(type) { 106 case USRQUOTA: 107 uid = p->p_ucred->cr_ruid; 108 break; 109 case GRPQUOTA: 110 uid = p->p_ucred->cr_rgid; 111 break; 112 default: 113 return (EINVAL); 114 } 115 } 116 117 switch (cmd) { 118 case Q_SYNC: 119 break; 120 case Q_GETQUOTA: 121 if (uid == p->p_ucred->cr_ruid) 122 break; 123 /* fall through */ 124 default: 125 if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0) 126 return (error); 127 } 128 129 type = cmds & SUBCMDMASK; 130 if ((uint)type >= MAXQUOTAS) 131 return (EINVAL); 132 if (vfs_busy(mp, LK_NOWAIT, NULL, td)) 133 return (0); 134 135 switch (cmd) { 136 137 case Q_QUOTAON: 138 error = quotaon(td, mp, type, arg); 139 break; 140 141 case Q_QUOTAOFF: 142 error = quotaoff(td, mp, type); 143 break; 144 145 case Q_SETQUOTA: 146 error = setquota(mp, uid, type, arg); 147 break; 148 149 case Q_SETUSE: 150 error = setuse(mp, uid, type, arg); 151 break; 152 153 case Q_GETQUOTA: 154 error = getquota(mp, uid, type, arg); 155 break; 156 157 case Q_SYNC: 158 error = qsync(mp); 159 break; 160 161 default: 162 error = EINVAL; 163 break; 164 } 165 vfs_unbusy(mp, td); 166 return (error); 167 #endif 168 } 169 170 /* 171 * Initial UFS filesystems, done only once. 172 */ 173 int 174 ufs_init(struct vfsconf *vfsp) 175 { 176 static int done; 177 178 if (done) 179 return (0); 180 done = 1; 181 ufs_ihashinit(); 182 #ifdef QUOTA 183 dqinit(); 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 */ 194 int 195 ufs_fhtovp(struct mount *mp, struct ufid *ufhp, struct vnode **vpp) 196 { 197 struct inode *ip; 198 struct vnode *nvp; 199 int error; 200 201 error = VFS_VGET(mp, ufhp->ufid_ino, &nvp); 202 if (error) { 203 *vpp = NULLVP; 204 return (error); 205 } 206 ip = VTOI(nvp); 207 if (ip->i_mode == 0 || 208 ip->i_gen != ufhp->ufid_gen || 209 (VFSTOUFS(mp)->um_i_effnlink_valid ? ip->i_effnlink : 210 ip->i_nlink) <= 0) { 211 vput(nvp); 212 *vpp = NULLVP; 213 return (ESTALE); 214 } 215 *vpp = nvp; 216 return (0); 217 } 218 219 220 /* 221 * This is the generic part of fhtovp called after the underlying 222 * filesystem has validated the file handle. 223 * 224 * Verify that a host should have access to a filesystem. 225 */ 226 int 227 ufs_check_export(struct mount *mp, struct sockaddr *nam, int *exflagsp, 228 struct ucred **credanonp) 229 { 230 struct netcred *np; 231 struct ufsmount *ump;; 232 233 ump = VFSTOUFS(mp); 234 /* 235 * Get the export permission structure for this <mp, client> tuple. 236 */ 237 np = vfs_export_lookup(mp, &ump->um_export, nam); 238 if (np == NULL) 239 return (EACCES); 240 241 *exflagsp = np->netc_exflags; 242 *credanonp = &np->netc_anon; 243 return (0); 244 } 245