sys/vfs/ufs/ufs_vfsops.c

   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 }