filecore_vfsops.c revision 1.78.2.2
1 /* $NetBSD: filecore_vfsops.c,v 1.78.2.2 2017/03/20 06:57:46 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 1.78.2.2 2017/03/20 06:57:46 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 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, false, NULL); 205 vfs_destroy(mp); 206 return (error); 207 } 208 mountlist_append(mp); 209 (void)filecore_statvfs(mp, &mp->mnt_stat, p); 210 vfs_unbusy(mp, false, NULL); 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 const struct bdevsw *bdev; 229 230 if (args == NULL) 231 return EINVAL; 232 if (*data_len < sizeof *args) 233 return EINVAL; 234 235 if (mp->mnt_flag & MNT_GETARGS) { 236 fcmp = VFSTOFILECORE(mp); 237 if (fcmp == NULL) 238 return EIO; 239 args->flags = fcmp->fc_mntflags; 240 args->uid = fcmp->fc_uid; 241 args->gid = fcmp->fc_gid; 242 args->fspec = NULL; 243 *data_len = sizeof *args; 244 return 0; 245 } 246 247 if ((mp->mnt_flag & MNT_RDONLY) == 0) 248 return (EROFS); 249 250 if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) 251 return EINVAL; 252 253 /* 254 * Not an update, or updating the name: look up the name 255 * and verify that it refers to a sensible block device. 256 */ 257 error = namei_simple_user(args->fspec, 258 NSM_FOLLOW_NOEMULROOT, &devvp); 259 if (error != 0) 260 return (error); 261 262 if (devvp->v_type != VBLK) { 263 vrele(devvp); 264 return ENOTBLK; 265 } 266 if ((bdev = bdevsw_lookup_acquire(devvp->v_rdev)) == NULL) { 267 vrele(devvp); 268 return ENXIO; 269 } 270 /* 271 * If mount by non-root, then verify that user has necessary 272 * permissions on the device. 273 */ 274 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 275 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 276 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(VREAD)); 277 VOP_UNLOCK(devvp); 278 if (error) { 279 bdevsw_release(bdev); 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 bdevsw_release(bdev); 294 vrele(devvp); 295 return error; 296 } 297 fcmp = VFSTOFILECORE(mp); 298 error = set_statvfs_info(path, UIO_USERSPACE, args->fspec, 299 UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l); 300 bdevsw_release(bdev); 301 return error; 302 } 303 304 /* 305 * Common code for mount and mountroot 306 */ 307 static int 308 filecore_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct filecore_args *argp) 309 { 310 struct filecore_mnt *fcmp = (struct filecore_mnt *)0; 311 struct buf *bp = NULL; 312 dev_t dev = devvp->v_rdev; 313 int error = EINVAL; 314 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 315 struct filecore_disc_record *fcdr; 316 unsigned map; 317 unsigned log2secsize; 318 319 if (!ronly) 320 return EROFS; 321 322 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 323 return (error); 324 325 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 326 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED); 327 VOP_UNLOCK(devvp); 328 if (error) 329 return error; 330 331 /* Read the filecore boot block to check FS validity and to find the map */ 332 error = bread(devvp, FILECORE_BOOTBLOCK_BLKN, 333 FILECORE_BOOTBLOCK_SIZE, 0, &bp); 334 #ifdef FILECORE_DEBUG_BR 335 printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp, 336 FILECORE_BOOTBLOCK_BLKN, FILECORE_BOOTBLOCK_SIZE, 337 bp, error); 338 #endif 339 if (error != 0) 340 goto out; 341 342 KASSERT(bp != NULL); 343 if (filecore_bbchecksum(bp->b_data) != 0) { 344 error = EINVAL; 345 goto out; 346 } 347 fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) + 348 FILECORE_BB_DISCREC); 349 map = ((((8 << fcdr->log2secsize) - fcdr->zone_spare) 350 * (fcdr->nzones / 2) - 8 * FILECORE_DISCREC_SIZE) 351 << fcdr->log2bpmb) >> fcdr->log2secsize; 352 log2secsize = fcdr->log2secsize; 353 #ifdef FILECORE_DEBUG_BR 354 printf("brelse(%p) vf1\n", bp); 355 #endif 356 brelse(bp, BC_AGE); 357 bp = NULL; 358 359 /* Read the bootblock in the map */ 360 error = bread(devvp, map, 1 << log2secsize, 0, &bp); 361 #ifdef FILECORE_DEBUG_BR 362 printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp, 363 map, 1 << log2secsize, bp, error); 364 #endif 365 if (error != 0) 366 goto out; 367 fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) + 4); 368 fcmp = kmem_zalloc(sizeof(*fcmp), KM_SLEEP); 369 if (fcdr->log2bpmb > fcdr->log2secsize) 370 fcmp->log2bsize = fcdr->log2bpmb; 371 else fcmp->log2bsize = fcdr->log2secsize; 372 fcmp->blksize = 1 << fcmp->log2bsize; 373 memcpy(&fcmp->drec, fcdr, sizeof(*fcdr)); 374 fcmp->map = map; 375 fcmp->idspz = ((8 << fcdr->log2secsize) - fcdr->zone_spare) 376 / (fcdr->idlen + 1); 377 fcmp->mask = (1 << fcdr->idlen) - 1; 378 if (fcdr->big_flag & 1) { 379 fcmp->nblks = ((((u_int64_t)fcdr->disc_size_2) << 32) 380 + fcdr->disc_size) / fcmp->blksize; 381 } else { 382 fcmp->nblks=fcdr->disc_size / fcmp->blksize; 383 } 384 385 #ifdef FILECORE_DEBUG_BR 386 printf("brelse(%p) vf2\n", bp); 387 #endif 388 brelse(bp, BC_AGE); 389 bp = NULL; 390 391 mp->mnt_data = fcmp; 392 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 393 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_FILECORE); 394 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 395 mp->mnt_stat.f_namemax = 10; 396 mp->mnt_flag |= MNT_LOCAL; 397 mp->mnt_dev_bshift = fcdr->log2secsize; 398 mp->mnt_fs_bshift = fcmp->log2bsize; 399 400 fcmp->fc_mountp = mp; 401 fcmp->fc_dev = dev; 402 fcmp->fc_devvp = devvp; 403 fcmp->fc_mntflags = argp->flags; 404 if (argp->flags & FILECOREMNT_USEUID) { 405 fcmp->fc_uid = kauth_cred_getuid(l->l_cred); 406 fcmp->fc_gid = kauth_cred_getgid(l->l_cred); 407 } else { 408 fcmp->fc_uid = argp->uid; 409 fcmp->fc_gid = argp->gid; 410 } 411 412 return 0; 413 out: 414 if (bp) { 415 #ifdef FILECORE_DEBUG_BR 416 printf("brelse(%p) vf3\n", bp); 417 #endif 418 brelse(bp, 0); 419 } 420 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 421 (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED); 422 VOP_UNLOCK(devvp); 423 return error; 424 } 425 426 /* 427 * Make a filesystem operational. 428 * Nothing to do at the moment. 429 */ 430 /* ARGSUSED */ 431 int 432 filecore_start(struct mount *mp, int flags) 433 { 434 return 0; 435 } 436 437 /* 438 * unmount system call 439 */ 440 int 441 filecore_unmount(struct mount *mp, int mntflags) 442 { 443 struct filecore_mnt *fcmp; 444 int error, flags = 0; 445 446 if (mntflags & MNT_FORCE) 447 flags |= FORCECLOSE; 448 if ((error = vflush(mp, NULLVP, flags)) != 0) 449 return (error); 450 451 fcmp = VFSTOFILECORE(mp); 452 453 if (fcmp->fc_devvp->v_type != VBAD) 454 spec_node_setmountedfs(fcmp->fc_devvp, NULL); 455 vn_lock(fcmp->fc_devvp, LK_EXCLUSIVE | LK_RETRY); 456 error = VOP_CLOSE(fcmp->fc_devvp, FREAD, NOCRED); 457 vput(fcmp->fc_devvp); 458 kmem_free(fcmp, sizeof(*fcmp)); 459 mp->mnt_data = NULL; 460 mp->mnt_flag &= ~MNT_LOCAL; 461 return (error); 462 } 463 464 /* 465 * Return root of a filesystem 466 */ 467 int 468 filecore_root(struct mount *mp, struct vnode **vpp) 469 { 470 struct vnode *nvp; 471 int error; 472 473 if ((error = VFS_VGET(mp, FILECORE_ROOTINO, &nvp)) != 0) 474 return (error); 475 *vpp = nvp; 476 return (0); 477 } 478 479 /* 480 * Get file system statistics. 481 */ 482 int 483 filecore_statvfs(struct mount *mp, struct statvfs *sbp) 484 { 485 struct filecore_mnt *fcmp = VFSTOFILECORE(mp); 486 487 sbp->f_bsize = fcmp->blksize; 488 sbp->f_frsize = sbp->f_bsize; /* XXX */ 489 sbp->f_iosize = sbp->f_bsize; /* XXX */ 490 sbp->f_blocks = fcmp->nblks; 491 sbp->f_bfree = 0; /* total free blocks */ 492 sbp->f_bavail = 0; /* blocks free for non superuser */ 493 sbp->f_bresvd = 0; /* reserved blocks */ 494 sbp->f_files = 0; /* total files */ 495 sbp->f_ffree = 0; /* free file nodes for non superuser */ 496 sbp->f_favail = 0; /* free file nodes */ 497 sbp->f_fresvd = 0; /* reserved file nodes */ 498 copy_statvfs_info(sbp, mp); 499 return 0; 500 } 501 502 /* ARGSUSED */ 503 int 504 filecore_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 505 { 506 return (0); 507 } 508 509 /* 510 * File handle to vnode 511 * 512 * Have to be really careful about stale file handles: 513 * - check that the inode number is in range 514 * - call iget() to get the locked inode 515 * - check for an unallocated inode (i_mode == 0) 516 * - check that the generation number matches 517 */ 518 519 struct ifid { 520 ushort ifid_len; 521 ushort ifid_pad; 522 u_int32_t ifid_ino; 523 }; 524 525 /* ARGSUSED */ 526 int 527 filecore_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 528 { 529 struct ifid ifh; 530 struct vnode *nvp; 531 struct filecore_node *ip; 532 int error; 533 534 if (fhp->fid_len != sizeof(struct ifid)) 535 return EINVAL; 536 537 memcpy(&ifh, fhp, sizeof(ifh)); 538 if ((error = VFS_VGET(mp, ifh.ifid_ino, &nvp)) != 0) { 539 *vpp = NULLVP; 540 return (error); 541 } 542 ip = VTOI(nvp); 543 if (filecore_staleinode(ip)) { 544 vput(nvp); 545 *vpp = NULLVP; 546 return (ESTALE); 547 } 548 *vpp = nvp; 549 return (0); 550 } 551 552 /* This looks complicated. Look at other vgets as well as the iso9660 one. 553 * 554 * The filecore inode number is made up of 1 byte directory entry index and 555 * 3 bytes of the internal disc address of the directory. On a read-only 556 * filesystem this is unique. For a read-write version we may not be able to 557 * do vget, see msdosfs. 558 */ 559 560 int 561 filecore_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 562 { 563 int error; 564 565 error = vcache_get(mp, &ino, sizeof(ino), vpp); 566 if (error) 567 return error; 568 error = vn_lock(*vpp, LK_EXCLUSIVE); 569 if (error) { 570 vrele(*vpp); 571 *vpp = NULL; 572 return error; 573 } 574 return 0; 575 } 576 577 /* 578 * Vnode pointer to File handle 579 */ 580 /* ARGSUSED */ 581 int 582 filecore_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 583 { 584 struct filecore_node *ip = VTOI(vp); 585 struct ifid ifh; 586 587 if (*fh_size < sizeof(struct ifid)) { 588 *fh_size = sizeof(struct ifid); 589 return E2BIG; 590 } 591 memset(&ifh, 0, sizeof(ifh)); 592 ifh.ifid_len = sizeof(struct ifid); 593 ifh.ifid_ino = ip->i_number; 594 memcpy(fhp, &ifh, sizeof(ifh)); 595 return 0; 596 } 597
Indexes created Wed Oct 01 12:09:54 GMT 2025