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 1.16 2006/08/03 16:40:48 swildner 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 * Return the root of a filesystem. 60 */ 61 int 62 ufs_root(struct mount *mp, struct vnode **vpp) 63 { 64 struct vnode *nvp; 65 int error; 66 67 error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp); 68 if (error) 69 return (error); 70 *vpp = nvp; 71 return (0); 72 } 73 74 /* 75 * Do operations associated with quotas 76 */ 77 int 78 ufs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 79 struct ucred *cred) 80 { 81 #ifndef QUOTA 82 return (EOPNOTSUPP); 83 #else 84 int cmd, type, error; 85 86 type = cmds & SUBCMDMASK; 87 cmd = cmds >> SUBCMDSHIFT; 88 89 if (uid == -1) { 90 switch(type) { 91 case USRQUOTA: 92 uid = cred->cr_ruid; 93 break; 94 case GRPQUOTA: 95 uid = cred->cr_rgid; 96 break; 97 default: 98 return (EINVAL); 99 } 100 } 101 102 switch (cmd) { 103 case Q_SYNC: 104 break; 105 case Q_GETQUOTA: 106 if (uid == cred->cr_ruid) 107 break; 108 /* fall through */ 109 default: 110 if ((error = suser_cred(cred, PRISON_ROOT)) != 0) 111 return (error); 112 } 113 114 type = cmds & SUBCMDMASK; 115 if ((uint)type >= MAXQUOTAS) 116 return (EINVAL); 117 if (vfs_busy(mp, LK_NOWAIT)) 118 return (0); 119 120 switch (cmd) { 121 122 case Q_QUOTAON: 123 error = ufs_quotaon(cred, mp, type, arg); 124 break; 125 126 case Q_QUOTAOFF: 127 error = ufs_quotaoff(mp, type); 128 break; 129 130 case Q_SETQUOTA: 131 error = ufs_setquota(mp, uid, type, arg); 132 break; 133 134 case Q_SETUSE: 135 error = ufs_setuse(mp, uid, type, arg); 136 break; 137 138 case Q_GETQUOTA: 139 error = ufs_getquota(mp, uid, type, arg); 140 break; 141 142 case Q_SYNC: 143 error = ufs_qsync(mp); 144 break; 145 146 default: 147 error = EINVAL; 148 break; 149 } 150 vfs_unbusy(mp); 151 return (error); 152 #endif 153 } 154 155 /* 156 * Initial UFS filesystems, done only once. 157 */ 158 int 159 ufs_init(struct vfsconf *vfsp) 160 { 161 static int done; 162 163 if (done) 164 return (0); 165 done = 1; 166 ufs_ihashinit(); 167 #ifdef QUOTA 168 ufs_dqinit(); 169 #endif 170 return (0); 171 } 172 173 /* 174 * This is the generic part of fhtovp called after the underlying 175 * filesystem has validated the file handle. 176 * 177 * Call the VFS_CHECKEXP beforehand to verify access. 178 */ 179 int 180 ufs_fhtovp(struct mount *mp, struct ufid *ufhp, struct vnode **vpp) 181 { 182 struct inode *ip; 183 struct vnode *nvp; 184 int error; 185 186 error = VFS_VGET(mp, ufhp->ufid_ino, &nvp); 187 if (error) { 188 *vpp = NULLVP; 189 return (error); 190 } 191 ip = VTOI(nvp); 192 if (ip->i_mode == 0 || 193 ip->i_gen != ufhp->ufid_gen || 194 (VFSTOUFS(mp)->um_i_effnlink_valid ? ip->i_effnlink : 195 ip->i_nlink) <= 0) { 196 vput(nvp); 197 *vpp = NULLVP; 198 return (ESTALE); 199 } 200 *vpp = nvp; 201 return (0); 202 } 203 204 205 /* 206 * This is the generic part of fhtovp called after the underlying 207 * filesystem has validated the file handle. 208 * 209 * Verify that a host should have access to a filesystem. 210 */ 211 int 212 ufs_check_export(struct mount *mp, struct sockaddr *nam, int *exflagsp, 213 struct ucred **credanonp) 214 { 215 struct netcred *np; 216 struct ufsmount *ump; 217 218 ump = VFSTOUFS(mp); 219 /* 220 * Get the export permission structure for this <mp, client> tuple. 221 */ 222 np = vfs_export_lookup(mp, &ump->um_export, nam); 223 if (np == NULL) 224 return (EACCES); 225 226 *exflagsp = np->netc_exflags; 227 *credanonp = &np->netc_anon; 228 return (0); 229 } 230