sys/ufs/lfs/ulfs_vfsops.c

   1 /*      $NetBSD: ulfs_vfsops.c,v 1.11 2015/09/15 15:01:03 dholland Exp $        */
   2 /*  from NetBSD: ufs_vfsops.c,v 1.52 2013/01/22 09:39:18 dholland Exp  */
   3
   4 /*
   5  * Copyright (c) 1991, 1993, 1994
   6  *      The Regents of the University of California.  All rights reserved.
   7  * (c) UNIX System Laboratories, Inc.
   8  * All or some portions of this file are derived from material licensed
   9  * to the University of California by American Telephone and Telegraph
  10  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  11  * the permission of UNIX System Laboratories, Inc.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      @(#)ufs_vfsops.c        8.8 (Berkeley) 5/20/95
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __KERNEL_RCSID(0, "$NetBSD: ulfs_vfsops.c,v 1.11 2015/09/15 15:01:03 dholland Exp $");
  42
  43 #if defined(_KERNEL_OPT)
  44 #include "opt_lfs.h"
  45 #include "opt_quota.h"
  46 #endif
  47
  48 #include <sys/param.h>
  49 #include <sys/mbuf.h>
  50 #include <sys/mount.h>
  51 #include <sys/proc.h>
  52 #include <sys/buf.h>
  53 #include <sys/vnode.h>
  54 #include <sys/kmem.h>
  55 #include <sys/kauth.h>
  56 #include <sys/quotactl.h>
  57
  58 #include <miscfs/specfs/specdev.h>
  59
  60 #include <ufs/lfs/lfs.h>
  61 #include <ufs/lfs/lfs_accessors.h>
  62 #include <ufs/lfs/ulfs_quotacommon.h>
  63 #include <ufs/lfs/ulfs_inode.h>
  64 #include <ufs/lfs/ulfsmount.h>
  65 #include <ufs/lfs/ulfs_extern.h>
  66 #ifdef LFS_DIRHASH
  67 #include <ufs/lfs/ulfs_dirhash.h>
  68 #endif
  69
  70 /* how many times ulfs_init() was called */
  71 static int ulfs_initcount = 0;
  72
  73 /*
  74  * Make a filesystem operational.
  75  * Nothing to do at the moment.
  76  */
  77 /* ARGSUSED */
  78 int
  79 ulfs_start(struct mount *mp, int flags)
  80 {
  81
  82         return (0);
  83 }
  84
  85 /*
  86  * Return the root of a filesystem.
  87  */
  88 int
  89 ulfs_root(struct mount *mp, struct vnode **vpp)
  90 {
  91         struct vnode *nvp;
  92         int error;
  93
  94         if ((error = VFS_VGET(mp, (ino_t)ULFS_ROOTINO, &nvp)) != 0)
  95                 return (error);
  96         *vpp = nvp;
  97         return (0);
  98 }
  99
 100 /*
 101  * Do operations associated with quotas
 102  */
 103 int
 104 ulfs_quotactl(struct mount *mp, struct quotactl_args *args)
 105 {
 106
 107 #if !defined(LFS_QUOTA) && !defined(LFS_QUOTA2)
 108         (void) mp;
 109         (void) args;
 110         return (EOPNOTSUPP);
 111 #else
 112         struct lwp *l = curlwp;
 113         int error;
 114
 115         /* Mark the mount busy, as we're passing it to kauth(9). */
 116         error = vfs_busy(mp, NULL);
 117         if (error) {
 118                 return (error);
 119         }
 120         mutex_enter(&mp->mnt_updating);
 121
 122         error = lfsquota_handle_cmd(mp, l, args);
 123
 124         mutex_exit(&mp->mnt_updating);
 125         vfs_unbusy(mp, false, NULL);
 126         return (error);
 127 #endif
 128 }
 129
 130 #if 0
 131         switch (cmd) {
 132         case Q_SYNC:
 133                 break;
 134
 135         case Q_GETQUOTA:
 136                 /* The user can always query about his own quota. */
 137                 if (uid == kauth_cred_getuid(l->l_cred))
 138                         break;
 139
 140                 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
 141                     KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, KAUTH_ARG(uid), NULL);
 142
 143                 break;
 144
 145         case Q_QUOTAON:
 146         case Q_QUOTAOFF:
 147                 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
 148                     KAUTH_REQ_SYSTEM_FS_QUOTA_ONOFF, mp, NULL, NULL);
 149
 150                 break;
 151
 152         case Q_SETQUOTA:
 153         case Q_SETUSE:
 154                 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA,
 155                     KAUTH_REQ_SYSTEM_FS_QUOTA_MANAGE, mp, KAUTH_ARG(uid), NULL);
 156
 157                 break;
 158
 159         default:
 160                 error = EINVAL;
 161                 break;
 162         }
 163
 164         type = cmds & SUBCMDMASK;
 165         if (!error) {
 166                 /* Only check if there was no error above. */
 167                 if ((u_int)type >= MAXQUOTAS)
 168                         error = EINVAL;
 169         }
 170
 171         if (error) {
 172                 vfs_unbusy(mp, false, NULL);
 173                 return (error);
 174         }
 175
 176         mutex_enter(&mp->mnt_updating);
 177         switch (cmd) {
 178
 179         case Q_QUOTAON:
 180                 error = quotaon(l, mp, type, arg);
 181                 break;
 182
 183         case Q_QUOTAOFF:
 184                 error = quotaoff(l, mp, type);
 185                 break;
 186
 187         case Q_SETQUOTA:
 188                 error = setquota(mp, uid, type, arg);
 189                 break;
 190
 191         case Q_SETUSE:
 192                 error = setuse(mp, uid, type, arg);
 193                 break;
 194
 195         case Q_GETQUOTA:
 196                 error = getquota(mp, uid, type, arg);
 197                 break;
 198
 199         case Q_SYNC:
 200                 error = lfs_qsync(mp);
 201                 break;
 202
 203         default:
 204                 error = EINVAL;
 205         }
 206         mutex_exit(&mp->mnt_updating);
 207         vfs_unbusy(mp, false, NULL);
 208         return (error);
 209 #endif
 210
 211 /*
 212  * This is the generic part of fhtovp called after the underlying
 213  * filesystem has validated the file handle.
 214  */
 215 int
 216 ulfs_fhtovp(struct mount *mp, struct ulfs_ufid *ufhp, struct vnode **vpp)
 217 {
 218         struct vnode *nvp;
 219         struct inode *ip;
 220         int error;
 221
 222         if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) {
 223                 if (error == ENOENT)
 224                         error = ESTALE;
 225                 *vpp = NULLVP;
 226                 return (error);
 227         }
 228         ip = VTOI(nvp);
 229         KASSERT(ip != NULL);
 230         if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) {
 231                 vput(nvp);
 232                 *vpp = NULLVP;
 233                 return (ESTALE);
 234         }
 235         *vpp = nvp;
 236         return (0);
 237 }
 238
 239 /*
 240  * Initialize ULFS filesystems, done only once.
 241  */
 242 void
 243 ulfs_init(void)
 244 {
 245         if (ulfs_initcount++ > 0)
 246                 return;
 247
 248 #if defined(LFS_QUOTA) || defined(LFS_QUOTA2)
 249         lfs_dqinit();
 250 #endif
 251 #ifdef LFS_DIRHASH
 252         ulfsdirhash_init();
 253 #endif
 254 #ifdef LFS_EXTATTR
 255         ulfs_extattr_init();
 256 #endif
 257 }
 258
 259 void
 260 ulfs_reinit(void)
 261 {
 262
 263 #if defined(LFS_QUOTA) || defined(LFS_QUOTA2)
 264         lfs_dqreinit();
 265 #endif
 266 }
 267
 268 /*
 269  * Free ULFS filesystem resources, done only once.
 270  */
 271 void
 272 ulfs_done(void)
 273 {
 274         if (--ulfs_initcount > 0)
 275                 return;
 276
 277 #if defined(LFS_QUOTA) || defined(LFS_QUOTA2)
 278         lfs_dqdone();
 279 #endif
 280 #ifdef LFS_DIRHASH
 281         ulfsdirhash_done();
 282 #endif
 283 #ifdef LFS_EXTATTR
 284         ulfs_extattr_done();
 285 #endif
 286 }