umap_vfsops.c revision 1.20
1 /* $NetBSD: umap_vfsops.c,v 1.20 1999/02/26 23:44:46 wrstuden 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 93 #ifdef UMAPFS_DIAGNOSTIC 94 printf("umapfs_mount(mp = %p)\n", mp); 95 #endif 96 97 /* 98 * Update is a no-op 99 */ 100 if (mp->mnt_flag & MNT_UPDATE) { 101 return (EOPNOTSUPP); 102 /* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/ 103 } 104 105 /* 106 * Get argument 107 */ 108 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args)); 109 if (error) 110 return (error); 111 112 /* 113 * Find lower node 114 */ 115 NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF, 116 UIO_USERSPACE, args.target, p); 117 if ((error = namei(ndp)) != 0) 118 return (error); 119 120 /* 121 * Sanity check on lower vnode 122 */ 123 lowerrootvp = ndp->ni_vp; 124 #ifdef UMAPFS_DIAGNOSTIC 125 printf("vp = %p, check for VDIR...\n", lowerrootvp); 126 #endif 127 vrele(ndp->ni_dvp); 128 ndp->ni_dvp = 0; 129 130 if (lowerrootvp->v_type != VDIR) { 131 vput(lowerrootvp); 132 return (EINVAL); 133 } 134 135 #ifdef UMAPFS_DIAGNOSTIC 136 printf("mp = %p\n", mp); 137 #endif 138 139 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount), 140 M_UFSMNT, M_WAITOK); /* XXX */ 141 142 /* 143 * Save reference to underlying FS 144 */ 145 amp->umapm_vfs = lowerrootvp->v_mount; 146 147 /* 148 * Now copy in the number of entries and maps for umap mapping. 149 */ 150 amp->info_nentries = args.nentries; 151 amp->info_gnentries = args.gnentries; 152 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata, 153 2*sizeof(u_long)*args.nentries); 154 if (error) 155 return (error); 156 157 #ifdef UMAP_DIAGNOSTIC 158 printf("umap_mount:nentries %d\n",args.nentries); 159 for (i = 0; i < args.nentries; i++) 160 printf(" %d maps to %d\n", amp->info_mapdata[i][0], 161 amp->info_mapdata[i][1]); 162 #endif 163 164 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata, 165 2*sizeof(u_long)*args.gnentries); 166 if (error) 167 return (error); 168 169 #ifdef UMAP_DIAGNOSTIC 170 printf("umap_mount:gnentries %d\n",args.gnentries); 171 for (i = 0; i < args.gnentries; i++) 172 printf("\tgroup %d maps to %d\n", 173 amp->info_gmapdata[i][0], 174 amp->info_gmapdata[i][1]); 175 #endif 176 177 178 /* 179 * Save reference. Each mount also holds 180 * a reference on the root vnode. 181 */ 182 error = umap_node_create(mp, lowerrootvp, &vp); 183 /* 184 * Unlock the node (either the lower or the alias) 185 */ 186 VOP_UNLOCK(vp, 0); 187 /* 188 * Make sure the node alias worked 189 */ 190 if (error) { 191 vrele(lowerrootvp); 192 free(amp, M_UFSMNT); /* XXX */ 193 return (error); 194 } 195 196 /* 197 * Keep a held reference to the root vnode. 198 * It is vrele'd in umapfs_unmount. 199 */ 200 umapm_rootvp = vp; 201 umapm_rootvp->v_flag |= VROOT; 202 amp->umapm_rootvp = umapm_rootvp; 203 if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL) 204 mp->mnt_flag |= MNT_LOCAL; 205 mp->mnt_data = (qaddr_t) amp; 206 vfs_getnewfsid(mp, MOUNT_UMAP); 207 208 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 209 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 210 (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 211 &size); 212 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 213 #ifdef UMAPFS_DIAGNOSTIC 214 printf("umapfs_mount: lower %s, alias at %s\n", 215 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname); 216 #endif 217 return (0); 218 } 219 220 /* 221 * VFS start. Nothing needed here - the start routine 222 * on the underlying filesystem will have been called 223 * when that filesystem was mounted. 224 */ 225 int 226 umapfs_start(mp, flags, p) 227 struct mount *mp; 228 int flags; 229 struct proc *p; 230 { 231 232 return (0); 233 /* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */ 234 } 235 236 /* 237 * Free reference to umap layer 238 */ 239 int 240 umapfs_unmount(mp, mntflags, p) 241 struct mount *mp; 242 int mntflags; 243 struct proc *p; 244 { 245 struct vnode *umapm_rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 246 int error; 247 int flags = 0; 248 249 #ifdef UMAPFS_DIAGNOSTIC 250 printf("umapfs_unmount(mp = %p)\n", mp); 251 #endif 252 253 if (mntflags & MNT_FORCE) 254 flags |= FORCECLOSE; 255 256 /* 257 * Clear out buffer cache. I don't think we 258 * ever get anything cached at this level at the 259 * moment, but who knows... 260 */ 261 #ifdef notyet 262 mntflushbuf(mp, 0); 263 if (mntinvalbuf(mp, 1)) 264 return (EBUSY); 265 #endif 266 if (umapm_rootvp->v_usecount > 1) 267 return (EBUSY); 268 if ((error = vflush(mp, umapm_rootvp, flags)) != 0) 269 return (error); 270 271 #ifdef UMAPFS_DIAGNOSTIC 272 vprint("alias root of lower", umapm_rootvp); 273 #endif 274 /* 275 * Release reference on underlying root vnode 276 */ 277 vrele(umapm_rootvp); 278 /* 279 * And blow it away for future re-use 280 */ 281 vgone(umapm_rootvp); 282 /* 283 * Finally, throw away the umap_mount structure 284 */ 285 free(mp->mnt_data, M_UFSMNT); /* XXX */ 286 mp->mnt_data = 0; 287 return (0); 288 } 289 290 int 291 umapfs_root(mp, vpp) 292 struct mount *mp; 293 struct vnode **vpp; 294 { 295 struct vnode *vp; 296 297 #ifdef UMAPFS_DIAGNOSTIC 298 printf("umapfs_root(mp = %p, vp = %p->%p)\n", mp, 299 MOUNTTOUMAPMOUNT(mp)->umapm_rootvp, 300 UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)); 301 #endif 302 303 /* 304 * Return locked reference to root. 305 */ 306 vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp; 307 VREF(vp); 308 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 309 *vpp = vp; 310 return (0); 311 } 312 313 int 314 umapfs_quotactl(mp, cmd, uid, arg, p) 315 struct mount *mp; 316 int cmd; 317 uid_t uid; 318 caddr_t arg; 319 struct proc *p; 320 { 321 322 return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p)); 323 } 324 325 int 326 umapfs_statfs(mp, sbp, p) 327 struct mount *mp; 328 struct statfs *sbp; 329 struct proc *p; 330 { 331 int error; 332 struct statfs mstat; 333 334 #ifdef UMAPFS_DIAGNOSTIC 335 printf("umapfs_statfs(mp = %p, vp = %p->%p)\n", mp, 336 MOUNTTOUMAPMOUNT(mp)->umapm_rootvp, 337 UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)); 338 #endif 339 340 memset(&mstat, 0, sizeof(mstat)); 341 342 error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p); 343 if (error) 344 return (error); 345 346 /* now copy across the "interesting" information and fake the rest */ 347 sbp->f_type = mstat.f_type; 348 sbp->f_flags = mstat.f_flags; 349 sbp->f_bsize = mstat.f_bsize; 350 sbp->f_iosize = mstat.f_iosize; 351 sbp->f_blocks = mstat.f_blocks; 352 sbp->f_bfree = mstat.f_bfree; 353 sbp->f_bavail = mstat.f_bavail; 354 sbp->f_files = mstat.f_files; 355 sbp->f_ffree = mstat.f_ffree; 356 if (sbp != &mp->mnt_stat) { 357 memcpy(&sbp->f_fsid, &mp->mnt_stat.f_fsid, sizeof(sbp->f_fsid)); 358 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 359 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 360 } 361 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 362 return (0); 363 } 364 365 int 366 umapfs_sync(mp, waitfor, cred, p) 367 struct mount *mp; 368 int waitfor; 369 struct ucred *cred; 370 struct proc *p; 371 { 372 373 /* 374 * XXX - Assumes no data cached at umap layer. 375 */ 376 return (0); 377 } 378 379 int 380 umapfs_vget(mp, ino, vpp) 381 struct mount *mp; 382 ino_t ino; 383 struct vnode **vpp; 384 { 385 386 return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp)); 387 } 388 389 int 390 umapfs_fhtovp(mp, fidp, vpp) 391 struct mount *mp; 392 struct fid *fidp; 393 struct vnode **vpp; 394 { 395 396 return (EOPNOTSUPP); 397 } 398 399 int 400 umapfs_checkexp(mp, nam, exflagsp, credanonp) 401 struct mount *mp; 402 struct mbuf *nam; 403 int *exflagsp; 404 struct ucred**credanonp; 405 { 406 407 return (EOPNOTSUPP); 408 } 409 410 int 411 umapfs_vptofh(vp, fhp) 412 struct vnode *vp; 413 struct fid *fhp; 414 { 415 416 return (EOPNOTSUPP); 417 } 418 419 int 420 umapfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 421 int *name; 422 u_int namelen; 423 void *oldp; 424 size_t *oldlenp; 425 void *newp; 426 size_t newlen; 427 struct proc *p; 428 { 429 return (EOPNOTSUPP); 430 } 431 432 extern struct vnodeopv_desc umapfs_vnodeop_opv_desc; 433 434 struct vnodeopv_desc *umapfs_vnodeopv_descs[] = { 435 &umapfs_vnodeop_opv_desc, 436 NULL, 437 }; 438 439 struct vfsops umapfs_vfsops = { 440 MOUNT_UMAP, 441 umapfs_mount, 442 umapfs_start, 443 umapfs_unmount, 444 umapfs_root, 445 umapfs_quotactl, 446 umapfs_statfs, 447 umapfs_sync, 448 umapfs_vget, 449 umapfs_fhtovp, 450 umapfs_vptofh, 451 umapfs_init, 452 umapfs_sysctl, 453 NULL, /* vfs_mountroot */ 454 umapfs_checkexp, 455 umapfs_vnodeopv_descs, 456 }; 457
Indexes created Tue Sep 23 07:09:52 GMT 2025