umap_vfsops.c revision 1.9
1 /* $NetBSD: umap_vfsops.c,v 1.9 1996/02/09 22:41:05 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * the UCLA Ficus project. 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 * from: @(#)null_vfsops.c 1.5 (Berkeley) 7/10/92 39 * @(#)umap_vfsops.c 8.3 (Berkeley) 1/21/94 40 */ 41 42 /* 43 * Umap Layer 44 * (See mount_umap(8) for a description of this layer.) 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/time.h> 50 #include <sys/types.h> 51 #include <sys/vnode.h> 52 #include <sys/mount.h> 53 #include <sys/namei.h> 54 #include <sys/malloc.h> 55 #include <miscfs/umapfs/umap.h> 56 57 int umapfs_mount __P((struct mount *, char *, caddr_t, 58 struct nameidata *, struct proc *)); 59 int umapfs_start __P((struct mount *, int, struct proc *)); 60 int umapfs_unmount __P((struct mount *, int, struct proc *)); 61 int umapfs_root __P((struct mount *, struct vnode **)); 62 int umapfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 63 struct proc *)); 64 int umapfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 65 int umapfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 66 int umapfs_vget __P((struct mount *, ino_t, struct vnode **)); 67 int umapfs_fhtovp __P((struct mount *, struct fid *, struct mbuf *, 68 struct vnode **, int *, struct ucred **)); 69 int umapfs_vptofh __P((struct vnode *, struct fid *)); 70 71 /* 72 * Mount umap layer 73 */ 74 int 75 umapfs_mount(mp, path, data, ndp, p) 76 struct mount *mp; 77 char *path; 78 caddr_t data; 79 struct nameidata *ndp; 80 struct proc *p; 81 { 82 struct umap_args args; 83 struct vnode *lowerrootvp, *vp; 84 struct vnode *umapm_rootvp; 85 struct umap_mount *amp; 86 size_t size; 87 int error; 88 89 #ifdef UMAPFS_DIAGNOSTIC 90 printf("umapfs_mount(mp = %x)\n", mp); 91 #endif 92 93 /* 94 * Update is a no-op 95 */ 96 if (mp->mnt_flag & MNT_UPDATE) { 97 return (EOPNOTSUPP); 98 /* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/ 99 } 100 101 /* 102 * Get argument 103 */ 104 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); 105 if (error) 106 return (error); 107 108 /* 109 * Find lower node 110 */ 111 NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF, 112 UIO_USERSPACE, args.target, p); 113 if ((error = namei(ndp)) != 0) 114 return (error); 115 116 /* 117 * Sanity check on lower vnode 118 */ 119 lowerrootvp = ndp->ni_vp; 120 #ifdef UMAPFS_DIAGNOSTIC 121 printf("vp = %x, check for VDIR...\n", lowerrootvp); 122 #endif 123 vrele(ndp->ni_dvp); 124 ndp->ni_dvp = 0; 125 126 if (lowerrootvp->v_type != VDIR) { 127 vput(lowerrootvp); 128 return (EINVAL); 129 } 130 131 #ifdef UMAPFS_DIAGNOSTIC 132 printf("mp = %x\n", mp); 133 #endif 134 135 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 136 M_UFSMNT, M_WAITOK); /* XXX */ 137 138 /* 139 * Save reference to underlying FS 140 */ 141 amp->umapm_vfs = lowerrootvp->v_mount; 142 143 /* 144 * Now copy in the number of entries and maps for umap mapping. 145 */ 146 amp->info_nentries = args.nentries; 147 amp->info_gnentries = args.gnentries; 148 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 149 2*sizeof(u_long)*args.nentries); 150 if (error) 151 return (error); 152 153 #ifdef UMAP_DIAGNOSTIC 154 printf("umap_mount:nentries %d\n",args.nentries); 155 for (i = 0; i < args.nentries; i++) 156 printf(" %d maps to %d\n", amp->info_mapdata[i][0], 157 amp->info_mapdata[i][1]); 158 #endif 159 160 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 161 2*sizeof(u_long)*args.nentries); 162 if (error) 163 return (error); 164 165 #ifdef UMAP_DIAGNOSTIC 166 printf("umap_mount:gnentries %d\n",args.gnentries); 167 for (i = 0; i < args.gnentries; i++) 168 printf(" group %d maps to %d\n", 169 amp->info_gmapdata[i][0], 170 amp->info_gmapdata[i][1]); 171 #endif 172 173 174 /* 175 * Save reference. Each mount also holds 176 * a reference on the root vnode. 177 */ 178 error = umap_node_create(mp, lowerrootvp, &vp); 179 /* 180 * Unlock the node (either the lower or the alias) 181 */ 182 VOP_UNLOCK(vp); 183 /* 184 * Make sure the node alias worked 185 */ 186 if (error) { 187 vrele(lowerrootvp); 188 free(amp, M_UFSMNT); /* XXX */ 189 return (error); 190 } 191 192 /* 193 * Keep a held reference to the root vnode. 194 * It is vrele'd in umapfs_unmount. 195 */ 196 umapm_rootvp = vp; 197 umapm_rootvp->v_flag |= VROOT; 198 amp->umapm_rootvp = umapm_rootvp; 199 if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL) 200 mp->mnt_flag |= MNT_LOCAL; 201 mp->mnt_data = (qaddr_t) amp; 202 getnewfsid(mp, makefstype(MOUNT_LOFS)); 203 204 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 205 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 206 (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 207 &size); 208 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 209 #ifdef UMAPFS_DIAGNOSTIC 210 printf("umapfs_mount: lower %s, alias at %s\n", 211 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 212 #endif 213 return (0); 214 } 215 216 /* 217 * VFS start. Nothing needed here - the start routine 218 * on the underlying filesystem will have been called 219 * when that filesystem was mounted. 220 */ 221 int 222 umapfs_start(mp, flags, p) 223 struct mount *mp; 224 int flags; 225 struct proc *p; 226 { 227 228 return (0); 229 /* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */ 230 } 231 232 /* 233 * Free reference to umap layer 234 */ 235 int 236 umapfs_unmount(mp, mntflags, p) 237 struct mount *mp; 238 int mntflags; 239 struct proc *p; 240 { 241 struct vnode *umapm_rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 242 int error; 243 int flags = 0; 244 extern int doforce; 245 246 #ifdef UMAPFS_DIAGNOSTIC 247 printf("umapfs_unmount(mp = %x)\n", mp); 248 #endif 249 250 if (mntflags & MNT_FORCE) { 251 /* lofs can never be rootfs so don't check for it */ 252 if (!doforce) 253 return (EINVAL); 254 flags |= FORCECLOSE; 255 } 256 257 /* 258 * Clear out buffer cache. I don't think we 259 * ever get anything cached at this level at the 260 * moment, but who knows... 261 */ 262 #ifdef notyet 263 mntflushbuf(mp, 0); 264 if (mntinvalbuf(mp, 1)) 265 return (EBUSY); 266 #endif 267 if (umapm_rootvp->v_usecount > 1) 268 return (EBUSY); 269 if ((error = vflush(mp, umapm_rootvp, flags)) != 0) 270 return (error); 271 272 #ifdef UMAPFS_DIAGNOSTIC 273 vprint("alias root of lower", umapm_rootvp); 274 #endif 275 /* 276 * Release reference on underlying root vnode 277 */ 278 vrele(umapm_rootvp); 279 /* 280 * And blow it away for future re-use 281 */ 282 vgone(umapm_rootvp); 283 /* 284 * Finally, throw away the umap_mount structure 285 */ 286 free(mp->mnt_data, M_UFSMNT); /* XXX */ 287 mp->mnt_data = 0; 288 return (0); 289 } 290 291 int 292 umapfs_root(mp, vpp) 293 struct mount *mp; 294 struct vnode **vpp; 295 { 296 struct vnode *vp; 297 298 #ifdef UMAPFS_DIAGNOSTIC 299 printf("umapfs_root(mp = %x, vp = %x->%x)\n", mp, 300 MOUNTTOUMAPMOUNT(mp)->umapm_rootvp, 301 UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp) 302 ); 303 #endif 304 305 /* 306 * Return locked reference to root. 307 */ 308 vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 309 VREF(vp); 310 VOP_LOCK(vp); 311 *vpp = vp; 312 return (0); 313 } 314 315 int 316 umapfs_quotactl(mp, cmd, uid, arg, p) 317 struct mount *mp; 318 int cmd; 319 uid_t uid; 320 caddr_t arg; 321 struct proc *p; 322 { 323 324 return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p)); 325 } 326 327 int 328 umapfs_statfs(mp, sbp, p) 329 struct mount *mp; 330 struct statfs *sbp; 331 struct proc *p; 332 { 333 int error; 334 struct statfs mstat; 335 336 #ifdef UMAPFS_DIAGNOSTIC 337 printf("umapfs_statfs(mp = %x, vp = %x->%x)\n", mp, 338 MOUNTTOUMAPMOUNT(mp)->umapm_rootvp, 339 UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp) 340 ); 341 #endif 342 343 bzero(&mstat, sizeof(mstat)); 344 345 error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p); 346 if (error) 347 return (error); 348 349 /* now copy across the "interesting" information and fake the rest */ 350 sbp->f_type = mstat.f_type; 351 sbp->f_flags = mstat.f_flags; 352 sbp->f_bsize = mstat.f_bsize; 353 sbp->f_iosize = mstat.f_iosize; 354 sbp->f_blocks = mstat.f_blocks; 355 sbp->f_bfree = mstat.f_bfree; 356 sbp->f_bavail = mstat.f_bavail; 357 sbp->f_files = mstat.f_files; 358 sbp->f_ffree = mstat.f_ffree; 359 if (sbp != &mp->mnt_stat) { 360 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 361 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 362 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 363 } 364 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 365 return (0); 366 } 367 368 int 369 umapfs_sync(mp, waitfor, cred, p) 370 struct mount *mp; 371 int waitfor; 372 struct ucred *cred; 373 struct proc *p; 374 { 375 376 /* 377 * XXX - Assumes no data cached at umap layer. 378 */ 379 return (0); 380 } 381 382 int 383 umapfs_vget(mp, ino, vpp) 384 struct mount *mp; 385 ino_t ino; 386 struct vnode **vpp; 387 { 388 389 return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp)); 390 } 391 392 int 393 umapfs_fhtovp(mp, fidp, nam, vpp, exflagsp, credanonp) 394 struct mount *mp; 395 struct fid *fidp; 396 struct mbuf *nam; 397 struct vnode **vpp; 398 int *exflagsp; 399 struct ucred**credanonp; 400 { 401 402 return (EOPNOTSUPP); 403 } 404 405 int 406 umapfs_vptofh(vp, fhp) 407 struct vnode *vp; 408 struct fid *fhp; 409 { 410 411 return (EOPNOTSUPP); 412 } 413 414 struct vfsops umap_vfsops = { 415 MOUNT_UMAP, 416 umapfs_mount, 417 umapfs_start, 418 umapfs_unmount, 419 umapfs_root, 420 umapfs_quotactl, 421 umapfs_statfs, 422 umapfs_sync, 423 umapfs_vget, 424 umapfs_fhtovp, 425 umapfs_vptofh, 426 umapfs_init, 427 }; 428
Indexes created Wed Sep 24 05:09:52 GMT 2025