1 /* $NetBSD: filecore_vfsops.c,v 1.83 2020/03/16 21:20:10 pgoyette 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 1.83 2020/03/16 21:20:10 pgoyette 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 extern const struct vnodeopv_desc filecore_vnodeop_opv_desc; 101 102 const struct vnodeopv_desc * const filecore_vnodeopv_descs[] = { 103 &filecore_vnodeop_opv_desc, 104 NULL, 105 }; 106 107 struct vfsops filecore_vfsops = { 108 .vfs_name = MOUNT_FILECORE, 109 .vfs_min_mount_data = sizeof (struct filecore_args), 110 .vfs_mount = filecore_mount, 111 .vfs_start = filecore_start, 112 .vfs_unmount = filecore_unmount, 113 .vfs_root = filecore_root, 114 .vfs_quotactl = (void *)eopnotsupp, 115 .vfs_statvfs = filecore_statvfs, 116 .vfs_sync = filecore_sync, 117 .vfs_vget = filecore_vget, 118 .vfs_loadvnode = filecore_loadvnode, 119 .vfs_fhtovp = filecore_fhtovp, 120 .vfs_vptofh = filecore_vptofh, 121 .vfs_init = filecore_init, 122 .vfs_reinit = filecore_reinit, 123 .vfs_done = filecore_done, 124 .vfs_snapshot = (void *)eopnotsupp, 125 .vfs_extattrctl = vfs_stdextattrctl, 126 .vfs_suspendctl = genfs_suspendctl, 127 .vfs_renamelock_enter = genfs_renamelock_enter, 128 .vfs_renamelock_exit = genfs_renamelock_exit, 129 .vfs_fsync = (void *)eopnotsupp, 130 .vfs_opv_descs = filecore_vnodeopv_descs 131 }; 132 133 SYSCTL_SETUP(filecore_sysctl_setup, "filecore fs sysctl") 134 { 135 136 sysctl_createv(clog, 0, NULL, NULL, 137 CTLFLAG_PERMANENT, 138 CTLTYPE_NODE, "filecore", 139 SYSCTL_DESCR("Acorn FILECORE file system"), 140 NULL, 0, NULL, 0, 141 CTL_VFS, 19, CTL_EOL); 142 /* 143 * XXX the "19" above could be dynamic, thereby eliminating 144 * one more instance of the "number to vfs" mapping problem, 145 * but "19" is the order as taken from sys/mount.h 146 */ 147 } 148 149 static int 150 filecore_modcmd(modcmd_t cmd, void *arg) 151 { 152 int error; 153 154 switch (cmd) { 155 case MODULE_CMD_INIT: 156 error = vfs_attach(&filecore_vfsops); 157 if (error != 0) 158 break; 159 break; 160 case MODULE_CMD_FINI: 161 error = vfs_detach(&filecore_vfsops); 162 if (error != 0) 163 break; 164 break; 165 default: 166 error = ENOTTY; 167 break; 168 } 169 170 return (error); 171 } 172 173 /* 174 * Called by vfs_mountroot when iso is going to be mounted as root. 175 * 176 * Name is updated by mount(8) after booting. 177 */ 178 179 static int filecore_mountfs(struct vnode *devvp, struct mount *mp, 180 struct lwp *l, struct filecore_args *argp); 181 182 #if 0 183 int 184 filecore_mountroot(void) 185 { 186 struct mount *mp; 187 extern struct vnode *rootvp; 188 struct proc *p = curproc; /* XXX */ 189 int error; 190 struct filecore_args args; 191 192 if (device_class(root_device) != DV_DISK) 193 return (ENODEV); 194 195 /* 196 * Get vnodes for swapdev and rootdev. 197 */ 198 if (bdevvp(rootdev, &rootvp)) 199 panic("filecore_mountroot: can't setup rootvp"); 200 201 if ((error = vfs_rootmountalloc(MOUNT_FILECORE, "root_device", &mp)) != 0) 202 return (error); 203 204 args.flags = FILECOREMNT_ROOT; 205 if ((error = filecore_mountfs(rootvp, mp, p, &args)) != 0) { 206 vfs_unbusy(mp); 207 vfs_rele(mp); 208 return (error); 209 } 210 mountlist_append(mp); 211 (void)filecore_statvfs(mp, &mp->mnt_stat, p); 212 vfs_unbusy(mp); 213 return (0); 214 } 215 #endif 216 217 /* 218 * VFS Operations. 219 * 220 * mount system call 221 */ 222 int 223 filecore_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 224 { 225 struct lwp *l = curlwp; 226 struct vnode *devvp; 227 struct filecore_args *args = data; 228 int error; 229 struct filecore_mnt *fcmp = NULL; 230 231 if (args == NULL) 232 return EINVAL; 233 if (*data_len < sizeof *args) 234 return EINVAL; 235 236 if (mp->mnt_flag & MNT_GETARGS) { 237 fcmp = VFSTOFILECORE(mp); 238 if (fcmp == NULL) 239 return EIO; 240 args->flags = fcmp->fc_mntflags; 241 args->uid = fcmp->fc_uid; 242 args->gid = fcmp->fc_gid; 243 args->fspec = NULL; 244 *data_len = sizeof *args; 245 return 0; 246 } 247 248 if ((mp->mnt_flag & MNT_RDONLY) == 0) 249 return (EROFS); 250 251 if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) 252 return EINVAL; 253 254 /* 255 * Not an update, or updating the name: look up the name 256 * and verify that it refers to a sensible block device. 257 */ 258 error = namei_simple_user(args->fspec, 259 NSM_FOLLOW_NOEMULROOT, &devvp); 260 if (error != 0) 261 return (error); 262 263 if (devvp->v_type != VBLK) { 264 vrele(devvp); 265 return ENOTBLK; 266 } 267 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 268 vrele(devvp); 269 return ENXIO; 270 } 271 /* 272 * If mount by non-root, then verify that user has necessary 273 * permissions on the device. 274 */ 275 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 276 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 277 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(VREAD)); 278 VOP_UNLOCK(devvp); 279 if (error) { 280 vrele(devvp); 281 return (error); 282 } 283 if ((mp->mnt_flag & MNT_UPDATE) == 0) 284 error = filecore_mountfs(devvp, mp, l, args); 285 else { 286 fcmp = VFSTOFILECORE(mp); 287 if (devvp != fcmp->fc_devvp) 288 error = EINVAL; /* needs translation */ 289 else 290 vrele(devvp); 291 } 292 if (error) { 293 vrele(devvp); 294 return error; 295 } 296 fcmp = VFSTOFILECORE(mp); 297 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 298 mp->mnt_op->vfs_name, mp, l); 299 } 300 301 /* 302 * Common code for mount and mountroot 303 */ 304 static int 305 filecore_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct filecore_args *argp) 306 { 307 struct filecore_mnt *fcmp = (struct filecore_mnt *)0; 308 struct buf *bp = NULL; 309 dev_t dev = devvp->v_rdev; 310 int error = EINVAL; 311 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 312 struct filecore_disc_record *fcdr; 313 unsigned map; 314 unsigned log2secsize; 315 316 if (!ronly) 317 return EROFS; 318 319 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 320 return (error); 321 322 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 323 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED); 324 VOP_UNLOCK(devvp); 325 if (error) 326 return error; 327 328 /* Read the filecore boot block to check FS validity and to find the map */ 329 error = bread(devvp, FILECORE_BOOTBLOCK_BLKN, 330 FILECORE_BOOTBLOCK_SIZE, 0, &bp); 331 #ifdef FILECORE_DEBUG_BR 332 printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp, 333 FILECORE_BOOTBLOCK_BLKN, FILECORE_BOOTBLOCK_SIZE, 334 bp, error); 335 #endif 336 if (error != 0) 337 goto out; 338 339 KASSERT(bp != NULL); 340 if (filecore_bbchecksum(bp->b_data) != 0) { 341 error = EINVAL; 342 goto out; 343 } 344 fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) + 345 FILECORE_BB_DISCREC); 346 map = ((((8 << fcdr->log2secsize) - fcdr->zone_spare) 347 * (fcdr->nzones / 2) - 8 * FILECORE_DISCREC_SIZE) 348 << fcdr->log2bpmb) >> fcdr->log2secsize; 349 log2secsize = fcdr->log2secsize; 350 #ifdef FILECORE_DEBUG_BR 351 printf("brelse(%p) vf1\n", bp); 352 #endif 353 brelse(bp, BC_AGE); 354 bp = NULL; 355 356 /* Read the bootblock in the map */ 357 error = bread(devvp, map, 1 << log2secsize, 0, &bp); 358 #ifdef FILECORE_DEBUG_BR 359 printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp, 360 map, 1 << log2secsize, bp, error); 361 #endif 362 if (error != 0) 363 goto out; 364 fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) + 4); 365 fcmp = kmem_zalloc(sizeof(*fcmp), KM_SLEEP); 366 if (fcdr->log2bpmb > fcdr->log2secsize) 367 fcmp->log2bsize = fcdr->log2bpmb; 368 else fcmp->log2bsize = fcdr->log2secsize; 369 fcmp->blksize = 1 << fcmp->log2bsize; 370 memcpy(&fcmp->drec, fcdr, sizeof(*fcdr)); 371 fcmp->map = map; 372 fcmp->idspz = ((8 << fcdr->log2secsize) - fcdr->zone_spare) 373 / (fcdr->idlen + 1); 374 fcmp->mask = (1 << fcdr->idlen) - 1; 375 if (fcdr->big_flag & 1) { 376 fcmp->nblks = ((((u_int64_t)fcdr->disc_size_2) << 32) 377 + fcdr->disc_size) / fcmp->blksize; 378 } else { 379 fcmp->nblks=fcdr->disc_size / fcmp->blksize; 380 } 381 382 #ifdef FILECORE_DEBUG_BR 383 printf("brelse(%p) vf2\n", bp); 384 #endif 385 brelse(bp, BC_AGE); 386 bp = NULL; 387 388 mp->mnt_data = fcmp; 389 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 390 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_FILECORE); 391 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 392 mp->mnt_stat.f_namemax = 10; 393 mp->mnt_flag |= MNT_LOCAL; 394 mp->mnt_dev_bshift = fcdr->log2secsize; 395 mp->mnt_fs_bshift = fcmp->log2bsize; 396 397 fcmp->fc_mountp = mp; 398 fcmp->fc_dev = dev; 399 fcmp->fc_devvp = devvp; 400 fcmp->fc_mntflags = argp->flags; 401 if (argp->flags & FILECOREMNT_USEUID) { 402 fcmp->fc_uid = kauth_cred_getuid(l->l_cred); 403 fcmp->fc_gid = kauth_cred_getgid(l->l_cred); 404 } else { 405 fcmp->fc_uid = argp->uid; 406 fcmp->fc_gid = argp->gid; 407 } 408 409 return 0; 410 out: 411 if (bp) { 412 #ifdef FILECORE_DEBUG_BR 413 printf("brelse(%p) vf3\n", bp); 414 #endif 415 brelse(bp, 0); 416 } 417 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 418 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED); 419 VOP_UNLOCK(devvp); 420 return error; 421 } 422 423 /* 424 * Make a filesystem operational. 425 * Nothing to do at the moment. 426 */ 427 /* ARGSUSED */ 428 int 429 filecore_start(struct mount *mp, int flags) 430 { 431 return 0; 432 } 433 434 /* 435 * unmount system call 436 */ 437 int 438 filecore_unmount(struct mount *mp, int mntflags) 439 { 440 struct filecore_mnt *fcmp; 441 int error, flags = 0; 442 443 if (mntflags & MNT_FORCE) 444 flags |= FORCECLOSE; 445 if ((error = vflush(mp, NULLVP, flags)) != 0) 446 return (error); 447 448 fcmp = VFSTOFILECORE(mp); 449 450 if (fcmp->fc_devvp->v_type != VBAD) 451 spec_node_setmountedfs(fcmp->fc_devvp, NULL); 452 vn_lock(fcmp->fc_devvp, LK_EXCLUSIVE | LK_RETRY); 453 error = VOP_CLOSE(fcmp->fc_devvp, FREAD, NOCRED); 454 vput(fcmp->fc_devvp); 455 kmem_free(fcmp, sizeof(*fcmp)); 456 mp->mnt_data = NULL; 457 mp->mnt_flag &= ~MNT_LOCAL; 458 return (error); 459 } 460 461 /* 462 * Return root of a filesystem 463 */ 464 int 465 filecore_root(struct mount *mp, int lktype, struct vnode **vpp) 466 { 467 struct vnode *nvp; 468 int error; 469 470 if ((error = VFS_VGET(mp, FILECORE_ROOTINO, lktype, &nvp)) != 0) 471 return (error); 472 *vpp = nvp; 473 return (0); 474 } 475 476 /* 477 * Get file system statistics. 478 */ 479 int 480 filecore_statvfs(struct mount *mp, struct statvfs *sbp) 481 { 482 struct filecore_mnt *fcmp = VFSTOFILECORE(mp); 483 484 sbp->f_bsize = fcmp->blksize; 485 sbp->f_frsize = sbp->f_bsize; /* XXX */ 486 sbp->f_iosize = sbp->f_bsize; /* XXX */ 487 sbp->f_blocks = fcmp->nblks; 488 sbp->f_bfree = 0; /* total free blocks */ 489 sbp->f_bavail = 0; /* blocks free for non superuser */ 490 sbp->f_bresvd = 0; /* reserved blocks */ 491 sbp->f_files = 0; /* total files */ 492 sbp->f_ffree = 0; /* free file nodes for non superuser */ 493 sbp->f_favail = 0; /* free file nodes */ 494 sbp->f_fresvd = 0; /* reserved file nodes */ 495 copy_statvfs_info(sbp, mp); 496 return 0; 497 } 498 499 /* ARGSUSED */ 500 int 501 filecore_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 502 { 503 return (0); 504 } 505 506 /* 507 * File handle to vnode 508 * 509 * Have to be really careful about stale file handles: 510 * - check that the inode number is in range 511 * - call iget() to get the locked inode 512 * - check for an unallocated inode (i_mode == 0) 513 * - check that the generation number matches 514 */ 515 516 struct ifid { 517 ushort ifid_len; 518 ushort ifid_pad; 519 u_int32_t ifid_ino; 520 }; 521 522 /* ARGSUSED */ 523 int 524 filecore_fhtovp(struct mount *mp, struct fid *fhp, int lktype, 525 struct vnode **vpp) 526 { 527 struct ifid ifh; 528 struct vnode *nvp; 529 struct filecore_node *ip; 530 int error; 531 532 if (fhp->fid_len != sizeof(struct ifid)) 533 return EINVAL; 534 535 memcpy(&ifh, fhp, sizeof(ifh)); 536 if ((error = VFS_VGET(mp, ifh.ifid_ino, lktype, &nvp)) != 0) { 537 *vpp = NULLVP; 538 return (error); 539 } 540 ip = VTOI(nvp); 541 if (filecore_staleinode(ip)) { 542 vput(nvp); 543 *vpp = NULLVP; 544 return (ESTALE); 545 } 546 *vpp = nvp; 547 return (0); 548 } 549 550 /* This looks complicated. Look at other vgets as well as the iso9660 one. 551 * 552 * The filecore inode number is made up of 1 byte directory entry index and 553 * 3 bytes of the internal disc address of the directory. On a read-only 554 * filesystem this is unique. For a read-write version we may not be able to 555 * do vget, see msdosfs. 556 */ 557 558 int 559 filecore_vget(struct mount *mp, ino_t ino, int lktype, struct vnode **vpp) 560 { 561 int error; 562 563 error = vcache_get(mp, &ino, sizeof(ino), vpp); 564 if (error) 565 return error; 566 error = vn_lock(*vpp, lktype); 567 if (error) { 568 vrele(*vpp); 569 *vpp = NULL; 570 return error; 571 } 572 return 0; 573 } 574 575 /* 576 * Vnode pointer to File handle 577 */ 578 /* ARGSUSED */ 579 int 580 filecore_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 581 { 582 struct filecore_node *ip = VTOI(vp); 583 struct ifid ifh; 584 585 if (*fh_size < sizeof(struct ifid)) { 586 *fh_size = sizeof(struct ifid); 587 return E2BIG; 588 } 589 memset(&ifh, 0, sizeof(ifh)); 590 ifh.ifid_len = sizeof(struct ifid); 591 ifh.ifid_ino = ip->i_number; 592 memcpy(fhp, &ifh, sizeof(ifh)); 593 return 0; 594 } 595
Indexes created Tue Sep 23 14:10:03 GMT 2025