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 1.17 2008/09/17 21:44:25 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/priv.h> 50 #include <sys/malloc.h> 51 #include <sys/vnode.h> 52 53 #include "quota.h" 54 #include "inode.h" 55 #include "ufsmount.h" 56 #include "ufs_extern.h" 57 58 MALLOC_DEFINE(M_UFSMNT, "UFS mount", "UFS mount structure"); 59 /* 60 * Return the root of a filesystem. 61 */ 62 int 63 ufs_root(struct mount *mp, struct vnode **vpp) 64 { 65 struct vnode *nvp; 66 int error; 67 68 error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp); 69 if (error) 70 return (error); 71 *vpp = nvp; 72 return (0); 73 } 74 75 /* 76 * Do operations associated with quotas 77 */ 78 int 79 ufs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 80 struct ucred *cred) 81 { 82 #ifndef QUOTA 83 return (EOPNOTSUPP); 84 #else 85 int cmd, type, error; 86 87 type = cmds & SUBCMDMASK; 88 cmd = cmds >> SUBCMDSHIFT; 89 90 if (uid == -1) { 91 switch(type) { 92 case USRQUOTA: 93 uid = cred->cr_ruid; 94 break; 95 case GRPQUOTA: 96 uid = cred->cr_rgid; 97 break; 98 default: 99 return (EINVAL); 100 } 101 } 102 103 switch (cmd) { 104 case Q_SYNC: 105 break; 106 case Q_GETQUOTA: 107 if (uid == cred->cr_ruid) 108 break; 109 /* fall through */ 110 default: 111 if ((error = priv_check_cred(cred, PRIV_ROOT, PRISON_ROOT)) != 0) 112 return (error); 113 } 114 115 type = cmds & SUBCMDMASK; 116 if ((uint)type >= MAXQUOTAS) 117 return (EINVAL); 118 if (vfs_busy(mp, LK_NOWAIT)) 119 return (0); 120 121 switch (cmd) { 122 123 case Q_QUOTAON: 124 error = ufs_quotaon(cred, mp, type, arg); 125 break; 126 127 case Q_QUOTAOFF: 128 error = ufs_quotaoff(mp, type); 129 break; 130 131 case Q_SETQUOTA: 132 error = ufs_setquota(mp, uid, type, arg); 133 break; 134 135 case Q_SETUSE: 136 error = ufs_setuse(mp, uid, type, arg); 137 break; 138 139 case Q_GETQUOTA: 140 error = ufs_getquota(mp, uid, type, arg); 141 break; 142 143 case Q_SYNC: 144 error = ufs_qsync(mp); 145 break; 146 147 default: 148 error = EINVAL; 149 break; 150 } 151 vfs_unbusy(mp); 152 return (error); 153 #endif 154 } 155 156 /* 157 * Initial UFS filesystems, done only once. 158 */ 159 int 160 ufs_init(struct vfsconf *vfsp) 161 { 162 static int done; 163 164 if (done) 165 return (0); 166 done = 1; 167 ufs_ihashinit(); 168 #ifdef QUOTA 169 ufs_dqinit(); 170 #endif 171 return (0); 172 } 173 174 /* 175 * This is the generic part of fhtovp called after the underlying 176 * filesystem has validated the file handle. 177 * 178 * Call the VFS_CHECKEXP beforehand to verify access. 179 */ 180 int 181 ufs_fhtovp(struct mount *mp, struct vnode *rootpv, 182 struct ufid *ufhp, struct vnode **vpp) 183 { 184 struct inode *ip; 185 struct vnode *nvp; 186 int error; 187 188 error = VFS_VGET(mp, ufhp->ufid_ino, &nvp); 189 if (error) { 190 *vpp = NULLVP; 191 return (error); 192 } 193 ip = VTOI(nvp); 194 if (ip->i_mode == 0 || 195 ip->i_gen != ufhp->ufid_gen || 196 (VFSTOUFS(mp)->um_i_effnlink_valid ? ip->i_effnlink : 197 ip->i_nlink) <= 0) { 198 vput(nvp); 199 *vpp = NULLVP; 200 return (ESTALE); 201 } 202 *vpp = nvp; 203 return (0); 204 } 205 206 207 /* 208 * This is the generic part of fhtovp called after the underlying 209 * filesystem has validated the file handle. 210 * 211 * Verify that a host should have access to a filesystem. 212 */ 213 int 214 ufs_check_export(struct mount *mp, struct sockaddr *nam, int *exflagsp, 215 struct ucred **credanonp) 216 { 217 struct netcred *np; 218 struct ufsmount *ump; 219 220 ump = VFSTOUFS(mp); 221 /* 222 * Get the export permission structure for this <mp, client> tuple. 223 */ 224 np = vfs_export_lookup(mp, &ump->um_export, nam); 225 if (np == NULL) 226 return (EACCES); 227 228 *exflagsp = np->netc_exflags; 229 *credanonp = &np->netc_anon; 230 return (0); 231 } 232