bsd/miscfs/umapfs/umap_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 /*      $NetBSD: umap_vfsops.c,v 1.7 1995/03/09 12:05:59 mycroft Exp $  */
  23
  24 /*
  25  * Copyright (c) 1992, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * This code is derived from software donated to Berkeley by
  29  * the UCLA Ficus project.
  30  *
  31  * Redistribution and use in source and binary forms, with or without
  32  * modification, are permitted provided that the following conditions
  33  * are met:
  34  * 1. Redistributions of source code must retain the above copyright
  35  *    notice, this list of conditions and the following disclaimer.
  36  * 2. Redistributions in binary form must reproduce the above copyright
  37  *    notice, this list of conditions and the following disclaimer in the
  38  *    documentation and/or other materials provided with the distribution.
  39  * 3. All advertising materials mentioning features or use of this software
  40  *    must display the following acknowledgement:
  41  *      This product includes software developed by the University of
  42  *      California, Berkeley and its contributors.
  43  * 4. Neither the name of the University nor the names of its contributors
  44  *    may be used to endorse or promote products derived from this software
  45  *    without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  57  * SUCH DAMAGE.
  58  *
  59  *      from: @(#)null_vfsops.c       1.5 (Berkeley) 7/10/92
  60  *      @(#)umap_vfsops.c       8.3 (Berkeley) 1/21/94
  61  */
  62
  63 /*
  64  * Umap Layer
  65  * (See mount_umap(8) for a description of this layer.)
  66  */
  67
  68 #include <sys/param.h>
  69 #include <sys/systm.h>
  70 #include <sys/time.h>
  71 #include <sys/types.h>
  72 #include <sys/vnode.h>
  73 #include <sys/mount.h>
  74 #include <sys/namei.h>
  75 #include <sys/malloc.h>
  76 #include <miscfs/umapfs/umap.h>
  77
  78 /*
  79  * Mount umap layer
  80  */
  81 int
  82 umapfs_mount(mp, path, data, ndp, p)
  83         struct mount *mp;
  84         char *path;
  85         caddr_t data;
  86         struct nameidata *ndp;
  87         struct proc *p;
  88 {
  89         struct umap_args args;
  90         struct vnode *lowerrootvp, *vp;
  91         struct vnode *umapm_rootvp;
  92         struct umap_mount *amp;
  93         size_t size;
  94         int error;
  95
  96 #ifdef UMAPFS_DIAGNOSTIC
  97         printf("umapfs_mount(mp = %x)\n", mp);
  98 #endif
  99
 100         /*
 101          * Update is a no-op
 102          */
 103         if (mp->mnt_flag & MNT_UPDATE) {
 104                 return (EOPNOTSUPP);
 105                 /* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/
 106         }
 107
 108         /*
 109          * Get argument
 110          */
 111         if (error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)))
 112                 return (error);
 113
 114         /*
 115          * Find lower node
 116          */
 117         NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
 118                 UIO_USERSPACE, args.target, p);
 119         if (error = namei(ndp))
 120                 return (error);
 121
 122         /*
 123          * Sanity check on lower vnode
 124          */
 125         lowerrootvp = ndp->ni_vp;
 126 #ifdef UMAPFS_DIAGNOSTIC
 127         printf("vp = %x, check for VDIR...\n", lowerrootvp);
 128 #endif
 129         vrele(ndp->ni_dvp);
 130         ndp->ni_dvp = 0;
 131
 132         if (lowerrootvp->v_type != VDIR) {
 133                 vput(lowerrootvp);
 134                 return (EINVAL);
 135         }
 136
 137 #ifdef UMAPFS_DIAGNOSTIC
 138         printf("mp = %x\n", mp);
 139 #endif
 140
 141 //      amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
 142 //                              M_UFSMNT, M_WAITOK);    /* XXX */
 143         MALLOC(amp, struct umap_mount *, sizeof(struct umap_mount),
 144                                 M_UFSMNT, M_WAITOK);
 145
 146         /*
 147          * Save reference to underlying FS
 148          */
 149         amp->umapm_vfs = lowerrootvp->v_mount;
 150
 151         /*
 152          * Now copy in the number of entries and maps for umap mapping.
 153          */
 154         amp->info_nentries = args.nentries;
 155         amp->info_gnentries = args.gnentries;
 156         error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
 157             2*sizeof(u_long)*args.nentries);
 158         if (error)
 159                 return (error);
 160
 161 #ifdef UMAP_DIAGNOSTIC
 162         printf("umap_mount:nentries %d\n",args.nentries);
 163         for (i = 0; i < args.nentries; i++)
 164                 printf("   %d maps to %d\n", amp->info_mapdata[i][0],
 165                     amp->info_mapdata[i][1]);
 166 #endif
 167
 168         error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
 169             2*sizeof(u_long)*args.nentries);
 170         if (error)
 171                 return (error);
 172
 173 #ifdef UMAP_DIAGNOSTIC
 174         printf("umap_mount:gnentries %d\n",args.gnentries);
 175         for (i = 0; i < args.gnentries; i++)
 176                 printf("        group %d maps to %d\n",
 177                     amp->info_gmapdata[i][0],
 178                     amp->info_gmapdata[i][1]);
 179 #endif
 180
 181
 182         /*
 183          * Save reference.  Each mount also holds
 184          * a reference on the root vnode.
 185          */
 186         error = umap_node_create(mp, lowerrootvp, &vp);
 187         /*
 188          * Unlock the node (either the lower or the alias)
 189          */
 190         VOP_UNLOCK(vp);
 191         /*
 192          * Make sure the node alias worked
 193          */
 194         if (error) {
 195                 vrele(lowerrootvp);
 196                 free(amp, M_UFSMNT);    /* XXX */
 197                 return (error);
 198         }
 199
 200         /*
 201          * Keep a held reference to the root vnode.
 202          * It is vrele'd in umapfs_unmount.
 203          */
 204         umapm_rootvp = vp;
 205         umapm_rootvp->v_flag |= VROOT;
 206         amp->umapm_rootvp = umapm_rootvp;
 207         if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
 208                 mp->mnt_flag |= MNT_LOCAL;
 209         mp->mnt_data = (qaddr_t) amp;
 210         getnewfsid(mp, makefstype(MOUNT_LOFS));
 211
 212         (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
 213         bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
 214         (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
 215             &size);
 216         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 217 #ifdef UMAPFS_DIAGNOSTIC
 218         printf("umapfs_mount: lower %s, alias at %s\n",
 219                 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
 220 #endif
 221         return (0);
 222 }
 223
 224 /*
 225  * VFS start.  Nothing needed here - the start routine
 226  * on the underlying filesystem will have been called
 227  * when that filesystem was mounted.
 228  */
 229 int
 230 umapfs_start(mp, flags, p)
 231         struct mount *mp;
 232         int flags;
 233         struct proc *p;
 234 {
 235
 236         return (0);
 237         /* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */
 238 }
 239
 240 /*
 241  * Free reference to umap layer
 242  */
 243 int
 244 umapfs_unmount(mp, mntflags, p)
 245         struct mount *mp;
 246         int mntflags;
 247         struct proc *p;
 248 {
 249         struct vnode *umapm_rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
 250         int error;
 251         int flags = 0;
 252         extern int doforce;
 253
 254 #ifdef UMAPFS_DIAGNOSTIC
 255         printf("umapfs_unmount(mp = %x)\n", mp);
 256 #endif
 257
 258         if (mntflags & MNT_FORCE) {
 259                 /* lofs can never be rootfs so don't check for it */
 260                 if (!doforce)
 261                         return (EINVAL);
 262                 flags |= FORCECLOSE;
 263         }
 264
 265         /*
 266          * Clear out buffer cache.  I don't think we
 267          * ever get anything cached at this level at the
 268          * moment, but who knows...
 269          */
 270 #ifdef notyet
 271         mntflushbuf(mp, 0);
 272         if (mntinvalbuf(mp, 1))
 273                 return (EBUSY);
 274 #endif
 275         if (umapm_rootvp->v_usecount > 1)
 276                 return (EBUSY);
 277         if (error = vflush(mp, umapm_rootvp, flags))
 278                 return (error);
 279
 280 #ifdef UMAPFS_DIAGNOSTIC
 281         vprint("alias root of lower", umapm_rootvp);
 282 #endif
 283         /*
 284          * Release reference on underlying root vnode
 285          */
 286         vrele(umapm_rootvp);
 287         /*
 288          * And blow it away for future re-use
 289          */
 290         vgone(umapm_rootvp);
 291         /*
 292          * Finally, throw away the umap_mount structure
 293          */
 294         free(mp->mnt_data, M_UFSMNT);   /* XXX */
 295         mp->mnt_data = 0;
 296         return (0);
 297 }
 298
 299 int
 300 umapfs_root(mp, vpp)
 301         struct mount *mp;
 302         struct vnode **vpp;
 303 {
 304         struct vnode *vp;
 305
 306 #ifdef UMAPFS_DIAGNOSTIC
 307         printf("umapfs_root(mp = %x, vp = %x->%x)\n", mp,
 308                         MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
 309                         UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)
 310                         );
 311 #endif
 312
 313         /*
 314          * Return locked reference to root.
 315          */
 316         vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
 317         VREF(vp);
 318         VOP_LOCK(vp);
 319         *vpp = vp;
 320         return (0);
 321 }
 322
 323 int
 324 umapfs_quotactl(mp, cmd, uid, arg, p)
 325         struct mount *mp;
 326         int cmd;
 327         uid_t uid;
 328         caddr_t arg;
 329         struct proc *p;
 330 {
 331
 332         return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p));
 333 }
 334
 335 int
 336 umapfs_statfs(mp, sbp, p)
 337         struct mount *mp;
 338         struct statfs *sbp;
 339         struct proc *p;
 340 {
 341         int error;
 342         struct statfs mstat;
 343
 344 #ifdef UMAPFS_DIAGNOSTIC
 345         printf("umapfs_statfs(mp = %x, vp = %x->%x)\n", mp,
 346                         MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
 347                         UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)
 348                         );
 349 #endif
 350
 351         bzero(&mstat, sizeof(mstat));
 352
 353         error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p);
 354         if (error)
 355                 return (error);
 356
 357         /* now copy across the "interesting" information and fake the rest */
 358         sbp->f_type = mstat.f_type;
 359         sbp->f_flags = mstat.f_flags;
 360         sbp->f_bsize = mstat.f_bsize;
 361         sbp->f_iosize = mstat.f_iosize;
 362         sbp->f_blocks = mstat.f_blocks;
 363         sbp->f_bfree = mstat.f_bfree;
 364         sbp->f_bavail = mstat.f_bavail;
 365         sbp->f_files = mstat.f_files;
 366         sbp->f_ffree = mstat.f_ffree;
 367         if (sbp != &mp->mnt_stat) {
 368                 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
 369                 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
 370                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 371         }
 372         strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
 373         sbp->f_fstypename[MFSNAMELEN] = '\0';
 374         return (0);
 375 }
 376
 377 int
 378 umapfs_sync(mp, waitfor, cred, p)
 379         struct mount *mp;
 380         int waitfor;
 381         struct ucred *cred;
 382         struct proc *p;
 383 {
 384
 385         /*
 386          * XXX - Assumes no data cached at umap layer.
 387          */
 388         return (0);
 389 }
 390
 391 int
 392 umapfs_vget(mp, ino, vpp)
 393         struct mount *mp;
 394         ino_t ino;
 395         struct vnode **vpp;
 396 {
 397
 398         return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
 399 }
 400
 401 int
 402 umapfs_fhtovp(mp, fidp, nam, vpp, exflagsp, credanonp)
 403         struct mount *mp;
 404         struct fid *fidp;
 405         struct mbuf *nam;
 406         struct vnode **vpp;
 407         int *exflagsp;
 408         struct ucred**credanonp;
 409 {
 410
 411         return (EOPNOTSUPP);
 412 }
 413
 414 int
 415 umapfs_vptofh(vp, fhp)
 416         struct vnode *vp;
 417         struct fid *fhp;
 418 {
 419
 420         return (EOPNOTSUPP);
 421 }
 422
 423 int umapfs_init __P((void));
 424
 425 struct vfsops umap_vfsops = {
 426         MOUNT_UMAP,
 427         umapfs_mount,
 428         umapfs_start,
 429         umapfs_unmount,
 430         umapfs_root,
 431         umapfs_quotactl,
 432         umapfs_statfs,
 433         umapfs_sync,
 434         umapfs_vget,
 435         umapfs_fhtovp,
 436         umapfs_vptofh,
 437         umapfs_init,
 438 };