umap_vfsops.c revision 1.22
1 /* $NetBSD: umap_vfsops.c,v 1.22 1999/03/19 21:46:26 perseant 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 8.8 (Berkeley) 5/14/95 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/proc.h> 50 #include <sys/time.h> 51 #include <sys/types.h> 52 #include <sys/vnode.h> 53 #include <sys/mount.h> 54 #include <sys/namei.h> 55 #include <sys/malloc.h> 56 #include <miscfs/umapfs/umap.h> 57 58 int umapfs_mount __P((struct mount *, const char *, void *, 59 struct nameidata *, struct proc *)); 60 int umapfs_start __P((struct mount *, int, struct proc *)); 61 int umapfs_unmount __P((struct mount *, int, struct proc *)); 62 int umapfs_root __P((struct mount *, struct vnode **)); 63 int umapfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 64 struct proc *)); 65 int umapfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 66 int umapfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 67 int umapfs_vget __P((struct mount *, ino_t, struct vnode **)); 68 int umapfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 69 int umapfs_checkexp __P((struct mount *, struct mbuf *, int *, 70 struct ucred **)); 71 int umapfs_vptofh __P((struct vnode *, struct fid *)); 72 int umapfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 73 struct proc *)); 74 75 /* 76 * Mount umap layer 77 */ 78 int 79 umapfs_mount(mp, path, data, ndp, p) 80 struct mount *mp; 81 const char *path; 82 void *data; 83 struct nameidata *ndp; 84 struct proc *p; 85 { 86 struct umap_args args; 87 struct vnode *lowerrootvp, *vp; 88 struct vnode *umapm_rootvp; 89 struct umap_mount *amp; 90 size_t size; 91 int error; 92 #ifdef UMAPFS_DIAGNOSTIC 93 int i; 94 #endif 95 96 /* only for root */ 97 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 98 return error; 99 100 #ifdef UMAPFS_DIAGNOSTIC 101 printf("umapfs_mount(mp = %p)\n", mp); 102 #endif 103 104 /* 105 * Update is a no-op 106 */ 107 if (mp->mnt_flag & MNT_UPDATE) { 108 return (EOPNOTSUPP); 109 /* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/ 110 } 111 112 /* 113 * Get argument 114 */ 115 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); 116 if (error) 117 return (error); 118 119 /* 120 * Find lower node 121 */ 122 NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF, 123 UIO_USERSPACE, args.target, p); 124 if ((error = namei(ndp)) != 0) 125 return (error); 126 127 /* 128 * Sanity check on lower vnode 129 */ 130 lowerrootvp = ndp->ni_vp; 131 #ifdef UMAPFS_DIAGNOSTIC 132 printf("vp = %p, check for VDIR...\n", lowerrootvp); 133 #endif 134 vrele(ndp->ni_dvp); 135 ndp->ni_dvp = 0; 136 137 if (lowerrootvp->v_type != VDIR) { 138 vput(lowerrootvp); 139 return (EINVAL); 140 } 141 142 #ifdef UMAPFS_DIAGNOSTIC 143 printf("mp = %p\n", mp); 144 #endif 145 146 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 147 M_UFSMNT, M_WAITOK); /* XXX */ 148 149 /* 150 * Save reference to underlying FS 151 */ 152 amp->umapm_vfs = lowerrootvp->v_mount; 153 154 /* 155 * Now copy in the number of entries and maps for umap mapping. 156 */ 157 amp->info_nentries = args.nentries; 158 amp->info_gnentries = args.gnentries; 159 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 160 2*sizeof(u_long)*args.nentries); 161 if (error) 162 return (error); 163 164 #ifdef UMAPFS_DIAGNOSTIC 165 printf("umap_mount:nentries %d\n",args.nentries); 166 for (i = 0; i < args.nentries; i++) 167 printf(" %ld maps to %ld\n", amp->info_mapdata[i][0], 168 amp->info_mapdata[i][1]); 169 #endif 170 171 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 172 2*sizeof(u_long)*args.gnentries); 173 if (error) 174 return (error); 175 176 #ifdef UMAPFS_DIAGNOSTIC 177 printf("umap_mount:gnentries %d\n",args.gnentries); 178 for (i = 0; i < args.gnentries; i++) 179 printf("\tgroup %ld maps to %ld\n", 180 amp->info_gmapdata[i][0], 181 amp->info_gmapdata[i][1]); 182 #endif 183 184 185 /* 186 * Save reference. Each mount also holds 187 * a reference on the root vnode. 188 */ 189 error = umap_node_create(mp, lowerrootvp, &vp); 190 /* 191 * Unlock the node (either the lower or the alias) 192 */ 193 VOP_UNLOCK(vp, 0); 194 /* 195 * Make sure the node alias worked 196 */ 197 if (error) { 198 vrele(lowerrootvp); 199 free(amp, M_UFSMNT); /* XXX */ 200 return (error); 201 } 202 203 /* 204 * Keep a held reference to the root vnode. 205 * It is vrele'd in umapfs_unmount. 206 */ 207 umapm_rootvp = vp; 208 umapm_rootvp->v_flag |= VROOT; 209 amp->umapm_rootvp = umapm_rootvp; 210 if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL) 211 mp->mnt_flag |= MNT_LOCAL; 212 mp->mnt_data = (qaddr_t) amp; 213 vfs_getnewfsid(mp, MOUNT_UMAP); 214 215 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 216 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 217 (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 218 &size); 219 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 220 #ifdef UMAPFS_DIAGNOSTIC 221 printf("umapfs_mount: lower %s, alias at %s\n", 222 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 223 #endif 224 return (0); 225 } 226 227 /* 228 * VFS start. Nothing needed here - the start routine 229 * on the underlying filesystem will have been called 230 * when that filesystem was mounted. 231 */ 232 int 233 umapfs_start(mp, flags, p) 234 struct mount *mp; 235 int flags; 236 struct proc *p; 237 { 238 239 return (0); 240 /* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */ 241 } 242 243 /* 244 * Free reference to umap layer 245 */ 246 int 247 umapfs_unmount(mp, mntflags, p) 248 struct mount *mp; 249 int mntflags; 250 struct proc *p; 251 { 252 struct vnode *umapm_rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 253 int error; 254 int flags = 0; 255 256 #ifdef UMAPFS_DIAGNOSTIC 257 printf("umapfs_unmount(mp = %p)\n", mp); 258 #endif 259 260 if (mntflags & MNT_FORCE) 261 flags |= FORCECLOSE; 262 263 /* 264 * Clear out buffer cache. I don't think we 265 * ever get anything cached at this level at the 266 * moment, but who knows... 267 */ 268 #ifdef notyet 269 mntflushbuf(mp, 0); 270 if (mntinvalbuf(mp, 1)) 271 return (EBUSY); 272 #endif 273 if (umapm_rootvp->v_usecount > 1) 274 return (EBUSY); 275 if ((error = vflush(mp, umapm_rootvp, flags)) != 0) 276 return (error); 277 278 #ifdef UMAPFS_DIAGNOSTIC 279 vprint("alias root of lower", umapm_rootvp); 280 #endif 281 /* 282 * Release reference on underlying root vnode 283 */ 284 vrele(umapm_rootvp); 285 /* 286 * And blow it away for future re-use 287 */ 288 vgone(umapm_rootvp); 289 /* 290 * Finally, throw away the umap_mount structure 291 */ 292 free(mp->mnt_data, M_UFSMNT); /* XXX */ 293 mp->mnt_data = 0; 294 return (0); 295 } 296 297 int 298 umapfs_root(mp, vpp) 299 struct mount *mp; 300 struct vnode **vpp; 301 { 302 struct vnode *vp; 303 304 #ifdef UMAPFS_DIAGNOSTIC 305 printf("umapfs_root(mp = %p, vp = %p->%p)\n", mp, 306 MOUNTTOUMAPMOUNT(mp)->umapm_rootvp, 307 UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)); 308 #endif 309 310 /* 311 * Return locked reference to root. 312 */ 313 vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 314 VREF(vp); 315 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 316 *vpp = vp; 317 return (0); 318 } 319 320 int 321 umapfs_quotactl(mp, cmd, uid, arg, p) 322 struct mount *mp; 323 int cmd; 324 uid_t uid; 325 caddr_t arg; 326 struct proc *p; 327 { 328 329 return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p)); 330 } 331 332 int 333 umapfs_statfs(mp, sbp, p) 334 struct mount *mp; 335 struct statfs *sbp; 336 struct proc *p; 337 { 338 int error; 339 struct statfs mstat; 340 341 #ifdef UMAPFS_DIAGNOSTIC 342 printf("umapfs_statfs(mp = %p, vp = %p->%p)\n", mp, 343 MOUNTTOUMAPMOUNT(mp)->umapm_rootvp, 344 UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)); 345 #endif 346 347 memset(&mstat, 0, sizeof(mstat)); 348 349 error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p); 350 if (error) 351 return (error); 352 353 /* now copy across the "interesting" information and fake the rest */ 354 sbp->f_type = mstat.f_type; 355 sbp->f_flags = mstat.f_flags; 356 sbp->f_bsize = mstat.f_bsize; 357 sbp->f_iosize = mstat.f_iosize; 358 sbp->f_blocks = mstat.f_blocks; 359 sbp->f_bfree = mstat.f_bfree; 360 sbp->f_bavail = mstat.f_bavail; 361 sbp->f_files = mstat.f_files; 362 sbp->f_ffree = mstat.f_ffree; 363 if (sbp != &mp->mnt_stat) { 364 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 365 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 366 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 367 } 368 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 369 return (0); 370 } 371 372 int 373 umapfs_sync(mp, waitfor, cred, p) 374 struct mount *mp; 375 int waitfor; 376 struct ucred *cred; 377 struct proc *p; 378 { 379 380 /* 381 * XXX - Assumes no data cached at umap layer. 382 */ 383 return (0); 384 } 385 386 int 387 umapfs_vget(mp, ino, vpp) 388 struct mount *mp; 389 ino_t ino; 390 struct vnode **vpp; 391 { 392 393 return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp)); 394 } 395 396 int 397 umapfs_fhtovp(mp, fidp, vpp) 398 struct mount *mp; 399 struct fid *fidp; 400 struct vnode **vpp; 401 { 402 403 return (EOPNOTSUPP); 404 } 405 406 int 407 umapfs_checkexp(mp, nam, exflagsp, credanonp) 408 struct mount *mp; 409 struct mbuf *nam; 410 int *exflagsp; 411 struct ucred**credanonp; 412 { 413 414 return (EOPNOTSUPP); 415 } 416 417 int 418 umapfs_vptofh(vp, fhp) 419 struct vnode *vp; 420 struct fid *fhp; 421 { 422 423 return (EOPNOTSUPP); 424 } 425 426 int 427 umapfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 428 int *name; 429 u_int namelen; 430 void *oldp; 431 size_t *oldlenp; 432 void *newp; 433 size_t newlen; 434 struct proc *p; 435 { 436 return (EOPNOTSUPP); 437 } 438 439 extern struct vnodeopv_desc umapfs_vnodeop_opv_desc; 440 441 struct vnodeopv_desc *umapfs_vnodeopv_descs[] = { 442 &umapfs_vnodeop_opv_desc, 443 NULL, 444 }; 445 446 struct vfsops umapfs_vfsops = { 447 MOUNT_UMAP, 448 umapfs_mount, 449 umapfs_start, 450 umapfs_unmount, 451 umapfs_root, 452 umapfs_quotactl, 453 umapfs_statfs, 454 umapfs_sync, 455 umapfs_vget, 456 umapfs_fhtovp, 457 umapfs_vptofh, 458 umapfs_init, 459 umapfs_sysctl, 460 NULL, /* vfs_mountroot */ 461 umapfs_checkexp, 462 umapfs_vnodeopv_descs, 463 }; 464
Indexes created Tue Sep 23 22:09:46 GMT 2025