bsd/ufs/ufs/ufs_vfsops.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*
  24  * Copyright (c) 1991, 1993, 1994
  25  *      The Regents of the University of California.  All rights reserved.
  26  * (c) UNIX System Laboratories, Inc.
  27  * All or some portions of this file are derived from material licensed
  28  * to the University of California by American Telephone and Telegraph
  29  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  30  * the permission of UNIX System Laboratories, Inc.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)ufs_vfsops.c        8.8 (Berkeley) 5/20/95
  61  */
  62
  63 #include <sys/param.h>
  64 #include <sys/mbuf.h>
  65 #include <sys/mount.h>
  66 #include <sys/proc.h>
  67 #include <sys/buf.h>
  68 #include <sys/vnode.h>
  69 #include <sys/malloc.h>
  70 #include <sys/quota.h>
  71
  72 #include <miscfs/specfs/specdev.h>
  73
  74 #include <ufs/ufs/quota.h>
  75 #include <ufs/ufs/inode.h>
  76 #include <ufs/ufs/ufsmount.h>
  77 #include <ufs/ufs/ufs_extern.h>
  78
  79 /*
  80  * Make a filesystem operational.
  81  * Nothing to do at the moment.
  82  */
  83 /* ARGSUSED */
  84 int
  85 ufs_start(mp, flags, p)
  86         struct mount *mp;
  87         int flags;
  88         struct proc *p;
  89 {
  90
  91         return (0);
  92 }
  93
  94 /*
  95  * Return the root of a filesystem.
  96  */
  97 int
  98 ufs_root(mp, vpp)
  99         struct mount *mp;
 100         struct vnode **vpp;
 101 {
 102         struct vnode *nvp;
 103         int error;
 104
 105         if (error = VFS_VGET(mp, (ino_t)ROOTINO, &nvp))
 106                 return (error);
 107         *vpp = nvp;
 108         return (0);
 109 }
 110
 111 /*
 112  * Do operations associated with quotas
 113  */
 114 int
 115 ufs_quotactl(mp, cmds, uid, arg, p)
 116         struct mount *mp;
 117         int cmds;
 118         uid_t uid;
 119         caddr_t arg;
 120         struct proc *p;
 121 {
 122         int cmd, type, error;
 123
 124 #if !QUOTA
 125         return (EOPNOTSUPP);
 126 #else
 127         if (uid == -1)
 128                 uid = p->p_cred->p_ruid;
 129         cmd = cmds >> SUBCMDSHIFT;
 130
 131         switch (cmd) {
 132         case Q_SYNC:
 133         case Q_QUOTASTAT:
 134                 break;
 135         case Q_GETQUOTA:
 136                 if (uid == p->p_cred->p_ruid)
 137                         break;
 138                 /* fall through */
 139         default:
 140                 if (error = suser(p->p_ucred, &p->p_acflag))
 141                         return (error);
 142         }
 143
 144         type = cmds & SUBCMDMASK;
 145         if ((u_int)type >= MAXQUOTAS)
 146                 return (EINVAL);
 147         if (vfs_busy(mp, LK_NOWAIT, 0, p))
 148                 return (0);
 149
 150         switch (cmd) {
 151
 152         case Q_QUOTAON:
 153                 error = quotaon(p, mp, type, arg, UIO_USERSPACE);
 154                 break;
 155
 156         case Q_QUOTAOFF:
 157                 error = quotaoff(p, mp, type);
 158                 break;
 159
 160         case Q_SETQUOTA:
 161                 error = setquota(mp, uid, type, arg);
 162                 break;
 163
 164         case Q_SETUSE:
 165                 error = setuse(mp, uid, type, arg);
 166                 break;
 167
 168         case Q_GETQUOTA:
 169                 error = getquota(mp, uid, type, arg);
 170                 break;
 171
 172         case Q_SYNC:
 173                 error = qsync(mp);
 174                 break;
 175
 176         case Q_QUOTASTAT:
 177                 error = quotastat(mp, type, arg);
 178                 break;
 179
 180         default:
 181                 error = EINVAL;
 182                 break;
 183         }
 184         vfs_unbusy(mp, p);
 185         return (error);
 186 #endif
 187 }
 188
 189 /*
 190  * Initial UFS filesystems, done only once.
 191  */
 192 int
 193 ufs_init(vfsp)
 194         struct vfsconf *vfsp;
 195 {
 196         static int done;
 197
 198         if (done)
 199                 return (0);
 200         done = 1;
 201         ufs_ihashinit();
 202 #if QUOTA
 203         dqinit();
 204 #endif
 205         return (0);
 206 }
 207
 208 /*
 209  * This is the generic part of fhtovp called after the underlying
 210  * filesystem has validated the file handle.
 211  *
 212  * Verify that a host should have access to a filesystem, and if so
 213  * return a vnode for the presented file handle.
 214  */
 215 int
 216 ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)
 217         register struct mount *mp;
 218         struct ufid *ufhp;
 219         struct mbuf *nam;
 220         struct vnode **vpp;
 221         int *exflagsp;
 222         struct ucred **credanonp;
 223 {
 224         register struct inode *ip;
 225         register struct netcred *np;
 226         register struct ufsmount *ump = VFSTOUFS(mp);
 227         struct vnode *nvp;
 228         int error;
 229
 230         /*
 231          * Get the export permission structure for this <mp, client> tuple.
 232          */
 233         np = vfs_export_lookup(mp, &ump->um_export, nam);
 234         if (np == NULL)
 235                 return (EACCES);
 236
 237         if (error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) {
 238                 *vpp = NULLVP;
 239                 return (error);
 240         }
 241         ip = VTOI(nvp);
 242         if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) {
 243                 vput(nvp);
 244                 *vpp = NULLVP;
 245                 return (ESTALE);
 246         }
 247         *vpp = nvp;
 248         *exflagsp = np->netc_exflags;
 249         *credanonp = &np->netc_anon;
 250         return (0);
 251 }