filecore_vfsops.c revision 1.81
1 /* $NetBSD: filecore_vfsops.c,v 1.81 2017/04/17 08:32:00 hannken Exp $ */ 2 3 /*- 4 * Copyright (c) 1994 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * filecore_vfsops.c 1.1 1998/6/26 32 */ 33 34 /*- 35 * Copyright (c) 1998 Andrew McMurry 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * filecore_vfsops.c 1.1 1998/6/26 66 */ 67 68 #include <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: filecore_vfsops.c,v 1.81 2017/04/17 08:32:00 hannken Exp $"); 70 71 #if defined(_KERNEL_OPT) 72 #include "opt_compat_netbsd.h" 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/namei.h> 78 #include <sys/proc.h> 79 #include <sys/vnode.h> 80 #include <miscfs/genfs/genfs.h> 81 #include <miscfs/specfs/specdev.h> 82 #include <sys/mount.h> 83 #include <sys/buf.h> 84 #include <sys/file.h> 85 #include <sys/device.h> 86 #include <sys/errno.h> 87 #include <sys/pool.h> 88 #include <sys/conf.h> 89 #include <sys/sysctl.h> 90 #include <sys/kauth.h> 91 #include <sys/module.h> 92 93 #include <fs/filecorefs/filecore.h> 94 #include <fs/filecorefs/filecore_extern.h> 95 #include <fs/filecorefs/filecore_node.h> 96 #include <fs/filecorefs/filecore_mount.h> 97 98 MODULE(MODULE_CLASS_VFS, filecore, NULL); 99 100 static struct sysctllog *filecore_sysctl_log; 101 102 extern const struct vnodeopv_desc filecore_vnodeop_opv_desc; 103 104 const struct vnodeopv_desc * const filecore_vnodeopv_descs[] = { 105 &filecore_vnodeop_opv_desc, 106 NULL, 107 }; 108 109 struct vfsops filecore_vfsops = { 110 .vfs_name = MOUNT_FILECORE, 111 .vfs_min_mount_data = sizeof (struct filecore_args), 112 .vfs_mount = filecore_mount, 113 .vfs_start = filecore_start, 114 .vfs_unmount = filecore_unmount, 115 .vfs_root = filecore_root, 116 .vfs_quotactl = (void *)eopnotsupp, 117 .vfs_statvfs = filecore_statvfs, 118 .vfs_sync = filecore_sync, 119 .vfs_vget = filecore_vget, 120 .vfs_loadvnode = filecore_loadvnode, 121 .vfs_fhtovp = filecore_fhtovp, 122 .vfs_vptofh = filecore_vptofh, 123 .vfs_init = filecore_init, 124 .vfs_reinit = filecore_reinit, 125 .vfs_done = filecore_done, 126 .vfs_snapshot = (void *)eopnotsupp, 127 .vfs_extattrctl = vfs_stdextattrctl, 128 .vfs_suspendctl = genfs_suspendctl, 129 .vfs_renamelock_enter = genfs_renamelock_enter, 130 .vfs_renamelock_exit = genfs_renamelock_exit, 131 .vfs_fsync = (void *)eopnotsupp, 132 .vfs_opv_descs = filecore_vnodeopv_descs 133 }; 134 135 static int 136 filecore_modcmd(modcmd_t cmd, void *arg) 137 { 138 int error; 139 140 switch (cmd) { 141 case MODULE_CMD_INIT: 142 error = vfs_attach(&filecore_vfsops); 143 if (error != 0) 144 break; 145 sysctl_createv(&filecore_sysctl_log, 0, NULL, NULL, 146 CTLFLAG_PERMANENT, 147 CTLTYPE_NODE, "filecore", 148 SYSCTL_DESCR("Acorn FILECORE file system"), 149 NULL, 0, NULL, 0, 150 CTL_VFS, 19, CTL_EOL); 151 /* 152 * XXX the "19" above could be dynamic, thereby eliminating 153 * one more instance of the "number to vfs" mapping problem, 154 * but "19" is the order as taken from sys/mount.h 155 */ 156 break; 157 case MODULE_CMD_FINI: 158 error = vfs_detach(&filecore_vfsops); 159 if (error != 0) 160 break; 161 sysctl_teardown(&filecore_sysctl_log); 162 break; 163 default: 164 error = ENOTTY; 165 break; 166 } 167 168 return (error); 169 } 170 171 /* 172 * Called by vfs_mountroot when iso is going to be mounted as root. 173 * 174 * Name is updated by mount(8) after booting. 175 */ 176 177 static int filecore_mountfs(struct vnode *devvp, struct mount *mp, 178 struct lwp *l, struct filecore_args *argp); 179 180 #if 0 181 int 182 filecore_mountroot(void) 183 { 184 struct mount *mp; 185 extern struct vnode *rootvp; 186 struct proc *p = curproc; /* XXX */ 187 int error; 188 struct filecore_args args; 189 190 if (device_class(root_device) != DV_DISK) 191 return (ENODEV); 192 193 /* 194 * Get vnodes for swapdev and rootdev. 195 */ 196 if (bdevvp(rootdev, &rootvp)) 197 panic("filecore_mountroot: can't setup rootvp"); 198 199 if ((error = vfs_rootmountalloc(MOUNT_FILECORE, "root_device", &mp)) != 0) 200 return (error); 201 202 args.flags = FILECOREMNT_ROOT; 203 if ((error = filecore_mountfs(rootvp, mp, p, &args)) != 0) { 204 vfs_unbusy(mp); 205 vfs_rele(mp); 206 return (error); 207 } 208 mountlist_append(mp); 209 (void)filecore_statvfs(mp, &mp->mnt_stat, p); 210 vfs_unbusy(mp); 211 return (0); 212 } 213 #endif 214 215 /* 216 * VFS Operations. 217 * 218 * mount system call 219 */ 220 int 221 filecore_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 222 { 223 struct lwp *l = curlwp; 224 struct vnode *devvp; 225 struct filecore_args *args = data; 226 int error; 227 struct filecore_mnt *fcmp = NULL; 228 229 if (args == NULL) 230 return EINVAL; 231 if (*data_len < sizeof *args) 232 return EINVAL; 233 234 if (mp->mnt_flag & MNT_GETARGS) { 235 fcmp = VFSTOFILECORE(mp); 236 if (fcmp == NULL) 237 return EIO; 238 args->flags = fcmp->fc_mntflags; 239 args->uid = fcmp->fc_uid; 240 args->gid = fcmp->fc_gid; 241 args->fspec = NULL; 242 *data_len = sizeof *args; 243 return 0; 244 } 245 246 if ((mp->mnt_flag & MNT_RDONLY) == 0) 247 return (EROFS); 248 249 if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) 250 return EINVAL; 251 252 /* 253 * Not an update, or updating the name: look up the name 254 * and verify that it refers to a sensible block device. 255 */ 256 error = namei_simple_user(args->fspec, 257 NSM_FOLLOW_NOEMULROOT, &devvp); 258 if (error != 0) 259 return (error); 260 261 if (devvp->v_type != VBLK) { 262 vrele(devvp); 263 return ENOTBLK; 264 } 265 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 266 vrele(devvp); 267 return ENXIO; 268 } 269 /* 270 * If mount by non-root, then verify that user has necessary 271 * permissions on the device. 272 */ 273 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 274 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 275 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(VREAD)); 276 VOP_UNLOCK(devvp); 277 if (error) { 278 vrele(devvp); 279 return (error); 280 } 281 if ((mp->mnt_flag & MNT_UPDATE) == 0) 282 error = filecore_mountfs(devvp, mp, l, args); 283 else { 284 fcmp = VFSTOFILECORE(mp); 285 if (devvp != fcmp->fc_devvp) 286 error = EINVAL; /* needs translation */ 287 else 288 vrele(devvp); 289 } 290 if (error) { 291 vrele(devvp); 292 return error; 293 } 294 fcmp = VFSTOFILECORE(mp); 295 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 296 mp->mnt_op->vfs_name, mp, l); 297 } 298 299 /* 300 * Common code for mount and mountroot 301 */ 302 static int 303 filecore_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct filecore_args *argp) 304 { 305 struct filecore_mnt *fcmp = (struct filecore_mnt *)0; 306 struct buf *bp = NULL; 307 dev_t dev = devvp->v_rdev; 308 int error = EINVAL; 309 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 310 struct filecore_disc_record *fcdr; 311 unsigned map; 312 unsigned log2secsize; 313 314 if (!ronly) 315 return EROFS; 316 317 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 318 return (error); 319 320 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 321 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED); 322 VOP_UNLOCK(devvp); 323 if (error) 324 return error; 325 326 /* Read the filecore boot block to check FS validity and to find the map */ 327 error = bread(devvp, FILECORE_BOOTBLOCK_BLKN, 328 FILECORE_BOOTBLOCK_SIZE, 0, &bp); 329 #ifdef FILECORE_DEBUG_BR 330 printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp, 331 FILECORE_BOOTBLOCK_BLKN, FILECORE_BOOTBLOCK_SIZE, 332 bp, error); 333 #endif 334 if (error != 0) 335 goto out; 336 337 KASSERT(bp != NULL); 338 if (filecore_bbchecksum(bp->b_data) != 0) { 339 error = EINVAL; 340 goto out; 341 } 342 fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) + 343 FILECORE_BB_DISCREC); 344 map = ((((8 << fcdr->log2secsize) - fcdr->zone_spare) 345 * (fcdr->nzones / 2) - 8 * FILECORE_DISCREC_SIZE) 346 << fcdr->log2bpmb) >> fcdr->log2secsize; 347 log2secsize = fcdr->log2secsize; 348 #ifdef FILECORE_DEBUG_BR 349 printf("brelse(%p) vf1\n", bp); 350 #endif 351 brelse(bp, BC_AGE); 352 bp = NULL; 353 354 /* Read the bootblock in the map */ 355 error = bread(devvp, map, 1 << log2secsize, 0, &bp); 356 #ifdef FILECORE_DEBUG_BR 357 printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp, 358 map, 1 << log2secsize, bp, error); 359 #endif 360 if (error != 0) 361 goto out; 362 fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) + 4); 363 fcmp = kmem_zalloc(sizeof(*fcmp), KM_SLEEP); 364 if (fcdr->log2bpmb > fcdr->log2secsize) 365 fcmp->log2bsize = fcdr->log2bpmb; 366 else fcmp->log2bsize = fcdr->log2secsize; 367 fcmp->blksize = 1 << fcmp->log2bsize; 368 memcpy(&fcmp->drec, fcdr, sizeof(*fcdr)); 369 fcmp->map = map; 370 fcmp->idspz = ((8 << fcdr->log2secsize) - fcdr->zone_spare) 371 / (fcdr->idlen + 1); 372 fcmp->mask = (1 << fcdr->idlen) - 1; 373 if (fcdr->big_flag & 1) { 374 fcmp->nblks = ((((u_int64_t)fcdr->disc_size_2) << 32) 375 + fcdr->disc_size) / fcmp->blksize; 376 } else { 377 fcmp->nblks=fcdr->disc_size / fcmp->blksize; 378 } 379 380 #ifdef FILECORE_DEBUG_BR 381 printf("brelse(%p) vf2\n", bp); 382 #endif 383 brelse(bp, BC_AGE); 384 bp = NULL; 385 386 mp->mnt_data = fcmp; 387 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 388 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_FILECORE); 389 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 390 mp->mnt_stat.f_namemax = 10; 391 mp->mnt_flag |= MNT_LOCAL; 392 mp->mnt_dev_bshift = fcdr->log2secsize; 393 mp->mnt_fs_bshift = fcmp->log2bsize; 394 395 fcmp->fc_mountp = mp; 396 fcmp->fc_dev = dev; 397 fcmp->fc_devvp = devvp; 398 fcmp->fc_mntflags = argp->flags; 399 if (argp->flags & FILECOREMNT_USEUID) { 400 fcmp->fc_uid = kauth_cred_getuid(l->l_cred); 401 fcmp->fc_gid = kauth_cred_getgid(l->l_cred); 402 } else { 403 fcmp->fc_uid = argp->uid; 404 fcmp->fc_gid = argp->gid; 405 } 406 407 return 0; 408 out: 409 if (bp) { 410 #ifdef FILECORE_DEBUG_BR 411 printf("brelse(%p) vf3\n", bp); 412 #endif 413 brelse(bp, 0); 414 } 415 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 416 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED); 417 VOP_UNLOCK(devvp); 418 return error; 419 } 420 421 /* 422 * Make a filesystem operational. 423 * Nothing to do at the moment. 424 */ 425 /* ARGSUSED */ 426 int 427 filecore_start(struct mount *mp, int flags) 428 { 429 return 0; 430 } 431 432 /* 433 * unmount system call 434 */ 435 int 436 filecore_unmount(struct mount *mp, int mntflags) 437 { 438 struct filecore_mnt *fcmp; 439 int error, flags = 0; 440 441 if (mntflags & MNT_FORCE) 442 flags |= FORCECLOSE; 443 if ((error = vflush(mp, NULLVP, flags)) != 0) 444 return (error); 445 446 fcmp = VFSTOFILECORE(mp); 447 448 if (fcmp->fc_devvp->v_type != VBAD) 449 spec_node_setmountedfs(fcmp->fc_devvp, NULL); 450 vn_lock(fcmp->fc_devvp, LK_EXCLUSIVE | LK_RETRY); 451 error = VOP_CLOSE(fcmp->fc_devvp, FREAD, NOCRED); 452 vput(fcmp->fc_devvp); 453 kmem_free(fcmp, sizeof(*fcmp)); 454 mp->mnt_data = NULL; 455 mp->mnt_flag &= ~MNT_LOCAL; 456 return (error); 457 } 458 459 /* 460 * Return root of a filesystem 461 */ 462 int 463 filecore_root(struct mount *mp, struct vnode **vpp) 464 { 465 struct vnode *nvp; 466 int error; 467 468 if ((error = VFS_VGET(mp, FILECORE_ROOTINO, &nvp)) != 0) 469 return (error); 470 *vpp = nvp; 471 return (0); 472 } 473 474 /* 475 * Get file system statistics. 476 */ 477 int 478 filecore_statvfs(struct mount *mp, struct statvfs *sbp) 479 { 480 struct filecore_mnt *fcmp = VFSTOFILECORE(mp); 481 482 sbp->f_bsize = fcmp->blksize; 483 sbp->f_frsize = sbp->f_bsize; /* XXX */ 484 sbp->f_iosize = sbp->f_bsize; /* XXX */ 485 sbp->f_blocks = fcmp->nblks; 486 sbp->f_bfree = 0; /* total free blocks */ 487 sbp->f_bavail = 0; /* blocks free for non superuser */ 488 sbp->f_bresvd = 0; /* reserved blocks */ 489 sbp->f_files = 0; /* total files */ 490 sbp->f_ffree = 0; /* free file nodes for non superuser */ 491 sbp->f_favail = 0; /* free file nodes */ 492 sbp->f_fresvd = 0; /* reserved file nodes */ 493 copy_statvfs_info(sbp, mp); 494 return 0; 495 } 496 497 /* ARGSUSED */ 498 int 499 filecore_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 500 { 501 return (0); 502 } 503 504 /* 505 * File handle to vnode 506 * 507 * Have to be really careful about stale file handles: 508 * - check that the inode number is in range 509 * - call iget() to get the locked inode 510 * - check for an unallocated inode (i_mode == 0) 511 * - check that the generation number matches 512 */ 513 514 struct ifid { 515 ushort ifid_len; 516 ushort ifid_pad; 517 u_int32_t ifid_ino; 518 }; 519 520 /* ARGSUSED */ 521 int 522 filecore_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 523 { 524 struct ifid ifh; 525 struct vnode *nvp; 526 struct filecore_node *ip; 527 int error; 528 529 if (fhp->fid_len != sizeof(struct ifid)) 530 return EINVAL; 531 532 memcpy(&ifh, fhp, sizeof(ifh)); 533 if ((error = VFS_VGET(mp, ifh.ifid_ino, &nvp)) != 0) { 534 *vpp = NULLVP; 535 return (error); 536 } 537 ip = VTOI(nvp); 538 if (filecore_staleinode(ip)) { 539 vput(nvp); 540 *vpp = NULLVP; 541 return (ESTALE); 542 } 543 *vpp = nvp; 544 return (0); 545 } 546 547 /* This looks complicated. Look at other vgets as well as the iso9660 one. 548 * 549 * The filecore inode number is made up of 1 byte directory entry index and 550 * 3 bytes of the internal disc address of the directory. On a read-only 551 * filesystem this is unique. For a read-write version we may not be able to 552 * do vget, see msdosfs. 553 */ 554 555 int 556 filecore_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 557 { 558 int error; 559 560 error = vcache_get(mp, &ino, sizeof(ino), vpp); 561 if (error) 562 return error; 563 error = vn_lock(*vpp, LK_EXCLUSIVE); 564 if (error) { 565 vrele(*vpp); 566 *vpp = NULL; 567 return error; 568 } 569 return 0; 570 } 571 572 /* 573 * Vnode pointer to File handle 574 */ 575 /* ARGSUSED */ 576 int 577 filecore_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 578 { 579 struct filecore_node *ip = VTOI(vp); 580 struct ifid ifh; 581 582 if (*fh_size < sizeof(struct ifid)) { 583 *fh_size = sizeof(struct ifid); 584 return E2BIG; 585 } 586 memset(&ifh, 0, sizeof(ifh)); 587 ifh.ifid_len = sizeof(struct ifid); 588 ifh.ifid_ino = ip->i_number; 589 memcpy(fhp, &ifh, sizeof(ifh)); 590 return 0; 591 } 592
Indexes created Wed Oct 01 12:09:54 GMT 2025