ufs_vfsops.c

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    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  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)ufs_vfsops.c        8.8 (Berkeley) 5/20/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 #include "opt_quota.h"
   41 #include "opt_ufs.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/kernel.h>
   46 #include <sys/lock.h>
   47 #include <sys/malloc.h>
   48 #include <sys/mount.h>
   49 #include <sys/proc.h>
   50 #include <sys/socket.h>
   51 #include <sys/vnode.h>
   52 
   53 #include <ufs/ufs/extattr.h>
   54 #include <ufs/ufs/quota.h>
   55 #include <ufs/ufs/inode.h>
   56 #include <ufs/ufs/ufsmount.h>
   57 #include <ufs/ufs/ufs_extern.h>
   58 #ifdef UFS_DIRHASH
   59 #include <ufs/ufs/dir.h>
   60 #include <ufs/ufs/dirhash.h>
   61 #endif
   62 
   63 MALLOC_DEFINE(M_UFSMNT, "ufs_mount", "UFS mount structure");
   64 
   65 /*
   66  * Return the root of a filesystem.
   67  */
   68 int
   69 ufs_root(mp, flags, vpp, td)
   70         struct mount *mp;
   71         int flags;
   72         struct vnode **vpp;
   73         struct thread *td;
   74 {
   75         struct vnode *nvp;
   76         int error;
   77 
   78         error = VFS_VGET(mp, (ino_t)ROOTINO, flags, &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(mp, cmds, id, arg, td)
   90         struct mount *mp;
   91         int cmds;
   92         uid_t id;
   93         void *arg;
   94         struct thread *td;
   95 {
   96 #ifndef QUOTA
   97         return (EOPNOTSUPP);
   98 #else
   99         int cmd, type, error;
  100 
  101         cmd = cmds >> SUBCMDSHIFT;
  102         type = cmds & SUBCMDMASK;
  103         if (id == -1) {
  104                 switch (type) {
  105 
  106                 case USRQUOTA:
  107                         id = td->td_ucred->cr_ruid;
  108                         break;
  109 
  110                 case GRPQUOTA:
  111                         id = td->td_ucred->cr_rgid;
  112                         break;
  113 
  114                 default:
  115                         return (EINVAL);
  116                 }
  117         }
  118         if ((u_int)type >= MAXQUOTAS)
  119                 return (EINVAL);
  120 
  121         switch (cmd) {
  122         case Q_QUOTAON:
  123                 error = quotaon(td, mp, type, arg);
  124                 break;
  125 
  126         case Q_QUOTAOFF:
  127                 error = quotaoff(td, mp, type);
  128                 break;
  129 
  130         case Q_SETQUOTA:
  131                 error = setquota(td, mp, id, type, arg);
  132                 break;
  133 
  134         case Q_SETUSE:
  135                 error = setuse(td, mp, id, type, arg);
  136                 break;
  137 
  138         case Q_GETQUOTA:
  139                 error = getquota(td, mp, id, type, arg);
  140                 break;
  141 
  142         case Q_SYNC:
  143                 error = qsync(mp);
  144                 break;
  145 
  146         default:
  147                 error = EINVAL;
  148                 break;
  149         }
  150         return (error);
  151 #endif
  152 }
  153 
  154 /*
  155  * Initial UFS filesystems, done only once.
  156  */
  157 int
  158 ufs_init(vfsp)
  159         struct vfsconf *vfsp;
  160 {
  161 
  162 #ifdef QUOTA
  163         dqinit();
  164 #endif
  165 #ifdef UFS_DIRHASH
  166         ufsdirhash_init();
  167 #endif
  168         return (0);
  169 }
  170 
  171 /*
  172  * Uninitialise UFS filesystems, done before module unload.
  173  */
  174 int
  175 ufs_uninit(vfsp)
  176         struct vfsconf *vfsp;
  177 {
  178 
  179 #ifdef QUOTA
  180         dquninit();
  181 #endif
  182 #ifdef UFS_DIRHASH
  183         ufsdirhash_uninit();
  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(mp, ufhp, vpp)
  196         struct mount *mp;
  197         struct ufid *ufhp;
  198         struct vnode **vpp;
  199 {
  200         struct inode *ip;
  201         struct vnode *nvp;
  202         int error;
  203 
  204         error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
  205         if (error) {
  206                 *vpp = NULLVP;
  207                 return (error);
  208         }
  209         ip = VTOI(nvp);
  210         if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen ||
  211             ip->i_effnlink <= 0) {
  212                 vput(nvp);
  213                 *vpp = NULLVP;
  214                 return (ESTALE);
  215         }
  216         *vpp = nvp;
  217         vnode_create_vobject(*vpp, DIP(ip, i_size), curthread);
  218         return (0);
  219 }

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sys/ufs/ufs/ufs_vfsops.c