1 /* $NetBSD: ext2fs_vfsops.c,v 1.228 2024/12/30 09:01:35 hannken Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993, 1994 5 * The Regents of the University of California. 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 * @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94 32 * Modified for ext2fs by Manuel Bouyer. 33 */ 34 35 /* 36 * Copyright (c) 1997 Manuel Bouyer. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 48 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 49 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 50 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 51 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 52 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 53 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 54 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 55 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 56 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 57 * 58 * @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94 59 * Modified for ext2fs by Manuel Bouyer. 60 */ 61 62 #include <sys/cdefs.h> 63 __KERNEL_RCSID(0, "$NetBSD: ext2fs_vfsops.c,v 1.228 2024/12/30 09:01:35 hannken Exp $"); 64 65 #if defined(_KERNEL_OPT) 66 #include "opt_compat_netbsd.h" 67 #endif 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/sysctl.h> 72 #include <sys/namei.h> 73 #include <sys/proc.h> 74 #include <sys/kernel.h> 75 #include <sys/vnode.h> 76 #include <sys/socket.h> 77 #include <sys/mount.h> 78 #include <sys/buf.h> 79 #include <sys/device.h> 80 #include <sys/file.h> 81 #include <sys/disklabel.h> 82 #include <sys/ioctl.h> 83 #include <sys/errno.h> 84 #include <sys/pool.h> 85 #include <sys/lock.h> 86 #include <sys/conf.h> 87 #include <sys/kauth.h> 88 #include <sys/module.h> 89 90 #include <miscfs/genfs/genfs.h> 91 #include <miscfs/specfs/specdev.h> 92 93 #include <ufs/ufs/quota.h> 94 #include <ufs/ufs/ufsmount.h> 95 #include <ufs/ufs/inode.h> 96 #include <ufs/ufs/dir.h> 97 #include <ufs/ufs/ufs_extern.h> 98 99 #include <ufs/ext2fs/ext2fs.h> 100 #include <ufs/ext2fs/ext2fs_dir.h> 101 #include <ufs/ext2fs/ext2fs_extern.h> 102 103 MODULE(MODULE_CLASS_VFS, ext2fs, "ufs"); 104 105 int ext2fs_sbupdate(struct ufsmount *, int); 106 static int ext2fs_sbfill(struct m_ext2fs *, int); 107 108 extern const struct vnodeopv_desc ext2fs_vnodeop_opv_desc; 109 extern const struct vnodeopv_desc ext2fs_specop_opv_desc; 110 extern const struct vnodeopv_desc ext2fs_fifoop_opv_desc; 111 112 const struct vnodeopv_desc * const ext2fs_vnodeopv_descs[] = { 113 &ext2fs_vnodeop_opv_desc, 114 &ext2fs_specop_opv_desc, 115 &ext2fs_fifoop_opv_desc, 116 NULL, 117 }; 118 119 struct vfsops ext2fs_vfsops = { 120 .vfs_name = MOUNT_EXT2FS, 121 .vfs_min_mount_data = sizeof (struct ufs_args), 122 .vfs_mount = ext2fs_mount, 123 .vfs_start = ufs_start, 124 .vfs_unmount = ext2fs_unmount, 125 .vfs_root = ufs_root, 126 .vfs_quotactl = ufs_quotactl, 127 .vfs_statvfs = ext2fs_statvfs, 128 .vfs_sync = ext2fs_sync, 129 .vfs_vget = ufs_vget, 130 .vfs_loadvnode = ext2fs_loadvnode, 131 .vfs_newvnode = ext2fs_newvnode, 132 .vfs_fhtovp = ext2fs_fhtovp, 133 .vfs_vptofh = ext2fs_vptofh, 134 .vfs_init = ext2fs_init, 135 .vfs_reinit = ext2fs_reinit, 136 .vfs_done = ext2fs_done, 137 .vfs_mountroot = ext2fs_mountroot, 138 .vfs_snapshot = (void *)eopnotsupp, 139 .vfs_extattrctl = vfs_stdextattrctl, 140 .vfs_suspendctl = genfs_suspendctl, 141 .vfs_renamelock_enter = genfs_renamelock_enter, 142 .vfs_renamelock_exit = genfs_renamelock_exit, 143 .vfs_fsync = (void *)eopnotsupp, 144 .vfs_opv_descs = ext2fs_vnodeopv_descs 145 }; 146 147 static const struct genfs_ops ext2fs_genfsops = { 148 .gop_size = genfs_size, 149 .gop_alloc = ext2fs_gop_alloc, 150 .gop_write = genfs_gop_write, 151 .gop_markupdate = ufs_gop_markupdate, 152 .gop_putrange = genfs_gop_putrange, 153 }; 154 155 static const struct ufs_ops ext2fs_ufsops = { 156 .uo_itimes = ext2fs_itimes, 157 .uo_update = ext2fs_update, 158 .uo_bufrd = ext2fs_bufrd, 159 .uo_bufwr = ext2fs_bufwr, 160 }; 161 162 static void 163 e2fs_cgload(const char *ondisk, struct ext2_gd *inmemory, int cg_size, 164 int shift_cg_entry_size) 165 { 166 167 if (shift_cg_entry_size == 6) { 168 memcpy(inmemory, ondisk, cg_size); 169 return; 170 } 171 172 const char *iptr = ondisk; 173 struct ext2_gd *optr = inmemory; 174 int sh = 1 << shift_cg_entry_size; 175 int lim = cg_size >> shift_cg_entry_size; 176 if (shift_cg_entry_size > 6) { 177 for (int i = 0; i < lim; i++, optr++, iptr += sh) { 178 memcpy(optr, iptr, sizeof(*optr)); 179 } 180 } else { 181 for (int i = 0; i < lim; i++, optr++, iptr += sh) { 182 memcpy(optr, iptr, E2FS_REV0_GD_SIZE); 183 memset((char *)optr + E2FS_REV0_GD_SIZE, 0, 184 sizeof(*optr) - E2FS_REV0_GD_SIZE); 185 } 186 } 187 } 188 189 static void 190 e2fs_cgsave(const struct ext2_gd *inmemory, char *ondisk, int cg_size, 191 int shift_cg_entry_size) 192 { 193 194 if (shift_cg_entry_size == 6) { 195 memcpy(ondisk, inmemory, cg_size); 196 return; 197 } 198 199 const struct ext2_gd *iptr = inmemory; 200 char *optr = ondisk; 201 int sh = 1 << shift_cg_entry_size; 202 int lim = cg_size >> shift_cg_entry_size; 203 if (shift_cg_entry_size > 6) { 204 for (int i = 0; i < lim; i++, iptr++, optr += sh) { 205 memcpy(optr, iptr, sizeof(*iptr)); 206 memset(optr + sizeof(*iptr), 0, sh - sizeof(*iptr)); 207 } 208 } else { 209 for (int i = 0; i < lim; i++, iptr++, optr += sh) { 210 memcpy(optr, iptr, E2FS_REV0_GD_SIZE); 211 } 212 } 213 } 214 215 /* Fill in the inode uid/gid from ext2 halves. */ 216 void 217 ext2fs_set_inode_guid(struct inode *ip) 218 { 219 220 ip->i_gid = ip->i_e2fs_gid; 221 ip->i_uid = ip->i_e2fs_uid; 222 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 223 ip->i_gid |= ip->i_e2fs_gid_high << 16; 224 ip->i_uid |= ip->i_e2fs_uid_high << 16; 225 } 226 } 227 228 SYSCTL_SETUP(ext2fs_sysctl_setup, "ext2fs sysctl") 229 { 230 231 sysctl_createv(clog, 0, NULL, NULL, 232 CTLFLAG_PERMANENT, 233 CTLTYPE_NODE, "ext2fs", 234 SYSCTL_DESCR("Linux EXT2FS file system"), 235 NULL, 0, NULL, 0, 236 CTL_VFS, 17, CTL_EOL); 237 /* 238 * XXX the "17" above could be dynamic, thereby eliminating 239 * one more instance of the "number to vfs" mapping problem, 240 * but "17" is the order as taken from sys/mount.h 241 */ 242 } 243 244 static int 245 ext2fs_modcmd(modcmd_t cmd, void *arg) 246 { 247 int error; 248 249 switch (cmd) { 250 case MODULE_CMD_INIT: 251 error = vfs_attach(&ext2fs_vfsops); 252 if (error != 0) 253 break; 254 break; 255 case MODULE_CMD_FINI: 256 error = vfs_detach(&ext2fs_vfsops); 257 if (error != 0) 258 break; 259 break; 260 default: 261 error = ENOTTY; 262 break; 263 } 264 265 return error; 266 } 267 268 /* 269 * XXX Same structure as FFS inodes? Should we share a common pool? 270 */ 271 struct pool ext2fs_inode_pool; 272 273 extern u_long ext2gennumber; 274 275 void 276 ext2fs_init(void) 277 { 278 279 pool_init(&ext2fs_inode_pool, sizeof(struct inode), 0, 0, 0, 280 "ext2fsinopl", &pool_allocator_nointr, IPL_NONE); 281 ufs_init(); 282 } 283 284 void 285 ext2fs_reinit(void) 286 { 287 ufs_reinit(); 288 } 289 290 void 291 ext2fs_done(void) 292 { 293 294 ufs_done(); 295 pool_destroy(&ext2fs_inode_pool); 296 } 297 298 static void 299 ext2fs_sb_setmountinfo(struct m_ext2fs *fs, struct mount *mp) 300 { 301 (void)strlcpy(fs->e2fs_fsmnt, mp->mnt_stat.f_mntonname, 302 sizeof(fs->e2fs_fsmnt)); 303 if (fs->e2fs_ronly == 0 && fs->e2fs.e2fs_rev > E2FS_REV0) { 304 (void)strlcpy(fs->e2fs.e2fs_fsmnt, mp->mnt_stat.f_mntonname, 305 sizeof(fs->e2fs.e2fs_fsmnt)); 306 307 fs->e2fs.e2fs_mtime = time_second; 308 fs->e2fs.e2fs_mnt_count++; 309 310 fs->e2fs_fmod = 1; 311 } 312 } 313 314 /* 315 * Called by main() when ext2fs is going to be mounted as root. 316 * 317 * Name is updated by mount(8) after booting. 318 */ 319 320 int 321 ext2fs_mountroot(void) 322 { 323 extern struct vnode *rootvp; 324 struct m_ext2fs *fs; 325 struct mount *mp; 326 struct ufsmount *ump; 327 int error; 328 329 if (device_class(root_device) != DV_DISK) 330 return ENODEV; 331 332 if ((error = vfs_rootmountalloc(MOUNT_EXT2FS, "root_device", &mp))) { 333 vrele(rootvp); 334 return error; 335 } 336 337 if ((error = ext2fs_mountfs(rootvp, mp)) != 0) { 338 vfs_unbusy(mp); 339 vfs_rele(mp); 340 return error; 341 } 342 mountlist_append(mp); 343 ump = VFSTOUFS(mp); 344 fs = ump->um_e2fs; 345 ext2fs_sb_setmountinfo(fs, mp); 346 (void)ext2fs_statvfs(mp, &mp->mnt_stat); 347 vfs_unbusy(mp); 348 setrootfstime((time_t)fs->e2fs.e2fs_wtime); 349 return 0; 350 } 351 352 /* 353 * VFS Operations. 354 * 355 * mount system call 356 */ 357 int 358 ext2fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 359 { 360 struct lwp *l = curlwp; 361 struct vnode *devvp; 362 struct ufs_args *args = data; 363 struct ufsmount *ump = NULL; 364 struct m_ext2fs *fs; 365 int error = 0, flags, update; 366 mode_t accessmode; 367 368 if (args == NULL) 369 return EINVAL; 370 if (*data_len < sizeof *args) 371 return EINVAL; 372 373 if (mp->mnt_flag & MNT_GETARGS) { 374 ump = VFSTOUFS(mp); 375 if (ump == NULL) 376 return EIO; 377 memset(args, 0, sizeof *args); 378 args->fspec = NULL; 379 *data_len = sizeof *args; 380 return 0; 381 } 382 383 update = mp->mnt_flag & MNT_UPDATE; 384 385 /* Check arguments */ 386 if (args->fspec != NULL) { 387 /* 388 * Look up the name and verify that it's sane. 389 */ 390 error = namei_simple_user(args->fspec, 391 NSM_FOLLOW_NOEMULROOT, &devvp); 392 if (error != 0) 393 return error; 394 395 if (!update) { 396 /* 397 * Be sure this is a valid block device 398 */ 399 if (devvp->v_type != VBLK) 400 error = ENOTBLK; 401 else if (bdevsw_lookup(devvp->v_rdev) == NULL) 402 error = ENXIO; 403 } else { 404 /* 405 * Be sure we're still naming the same device 406 * used for our initial mount 407 */ 408 ump = VFSTOUFS(mp); 409 if (devvp != ump->um_devvp) { 410 if (devvp->v_rdev != ump->um_devvp->v_rdev) 411 error = EINVAL; 412 else { 413 vrele(devvp); 414 devvp = ump->um_devvp; 415 vref(devvp); 416 } 417 } 418 } 419 } else { 420 if (!update) { 421 /* New mounts must have a filename for the device */ 422 return EINVAL; 423 } else { 424 ump = VFSTOUFS(mp); 425 devvp = ump->um_devvp; 426 vref(devvp); 427 } 428 } 429 430 /* 431 * If mount by non-root, then verify that user has necessary 432 * permissions on the device. 433 * 434 * Permission to update a mount is checked higher, so here we presume 435 * updating the mount is okay (for example, as far as securelevel goes) 436 * which leaves us with the normal check. 437 */ 438 if (error == 0) { 439 accessmode = VREAD; 440 if (update ? 441 (mp->mnt_iflag & IMNT_WANTRDWR) != 0 : 442 (mp->mnt_flag & MNT_RDONLY) == 0) 443 accessmode |= VWRITE; 444 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 445 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 446 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, 447 KAUTH_ARG(accessmode)); 448 VOP_UNLOCK(devvp); 449 } 450 451 if (error) { 452 vrele(devvp); 453 return error; 454 } 455 456 if (!update) { 457 int xflags; 458 459 if (mp->mnt_flag & MNT_RDONLY) 460 xflags = FREAD; 461 else 462 xflags = FREAD|FWRITE; 463 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 464 error = VOP_OPEN(devvp, xflags, FSCRED); 465 VOP_UNLOCK(devvp); 466 if (error) 467 goto fail; 468 error = ext2fs_mountfs(devvp, mp); 469 if (error) { 470 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 471 (void)VOP_CLOSE(devvp, xflags, NOCRED); 472 VOP_UNLOCK(devvp); 473 goto fail; 474 } 475 476 ump = VFSTOUFS(mp); 477 fs = ump->um_e2fs; 478 } else { 479 /* 480 * Update the mount. 481 */ 482 483 /* 484 * The initial mount got a reference on this 485 * device, so drop the one obtained via 486 * namei(), above. 487 */ 488 vrele(devvp); 489 490 ump = VFSTOUFS(mp); 491 fs = ump->um_e2fs; 492 if (fs->e2fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 493 /* 494 * Changing from r/w to r/o 495 */ 496 flags = WRITECLOSE; 497 if (mp->mnt_flag & MNT_FORCE) 498 flags |= FORCECLOSE; 499 error = ext2fs_flushfiles(mp, flags); 500 if (error == 0 && 501 ext2fs_cgupdate(ump, MNT_WAIT) == 0 && 502 (fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) { 503 fs->e2fs.e2fs_state = E2FS_ISCLEAN; 504 (void) ext2fs_sbupdate(ump, MNT_WAIT); 505 } 506 if (error) 507 return error; 508 fs->e2fs_ronly = 1; 509 } 510 511 if (mp->mnt_flag & MNT_RELOAD) { 512 error = ext2fs_reload(mp, l->l_cred, l); 513 if (error) 514 return error; 515 } 516 517 if (fs->e2fs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) { 518 /* 519 * Changing from read-only to read/write 520 */ 521 fs->e2fs_ronly = 0; 522 if (fs->e2fs.e2fs_state == E2FS_ISCLEAN) 523 fs->e2fs.e2fs_state = 0; 524 else 525 fs->e2fs.e2fs_state = E2FS_ERRORS; 526 fs->e2fs_fmod = 1; 527 } 528 if (args->fspec == NULL) 529 return 0; 530 } 531 532 error = set_statvfs_info(path, UIO_USERSPACE, args->fspec, 533 UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l); 534 if (error == 0) 535 ext2fs_sb_setmountinfo(fs, mp); 536 537 if (fs->e2fs_fmod != 0) { /* XXX */ 538 fs->e2fs_fmod = 0; 539 if (fs->e2fs.e2fs_state == 0) 540 fs->e2fs.e2fs_wtime = time_second; 541 else 542 printf("%s: file system not clean; please fsck(8)\n", 543 mp->mnt_stat.f_mntfromname); 544 (void) ext2fs_cgupdate(ump, MNT_WAIT); 545 } 546 return error; 547 548 fail: 549 vrele(devvp); 550 return error; 551 } 552 553 /* 554 * Sanity check the disk vnode content, and copy it over to inode structure. 555 */ 556 static int 557 ext2fs_loadvnode_content(struct m_ext2fs *fs, ino_t ino, struct buf *bp, struct inode *ip) 558 { 559 struct ext2fs_dinode *din; 560 int error = 0; 561 562 din = (struct ext2fs_dinode *)((char *)bp->b_data + 563 (ino_to_fsbo(fs, ino) * EXT2_DINODE_SIZE(fs))); 564 565 /* sanity checks - inode data NOT byteswapped at this point */ 566 if (EXT2_DINODE_FITS(din, e2di_extra_isize, EXT2_DINODE_SIZE(fs)) 567 && (EXT2_DINODE_SIZE(fs) - EXT2_REV0_DINODE_SIZE) 568 < fs2h16(din->e2di_extra_isize)) 569 { 570 printf("ext2fs: inode %"PRIu64" bad extra_isize %u", 571 ino, din->e2di_extra_isize); 572 error = EINVAL; 573 goto bad; 574 } 575 576 /* everything alright, proceed with copy */ 577 if (ip->i_din.e2fs_din == NULL) 578 ip->i_din.e2fs_din = kmem_alloc(EXT2_DINODE_SIZE(fs), KM_SLEEP); 579 580 e2fs_iload(din, ip->i_din.e2fs_din, EXT2_DINODE_SIZE(fs)); 581 582 ext2fs_set_inode_guid(ip); 583 584 bad: 585 return error; 586 } 587 588 /* 589 * Reload all incore data for a filesystem (used after running fsck on 590 * the root filesystem and finding things to fix). The filesystem must 591 * be mounted read-only. 592 * 593 * Things to do to update the mount: 594 * 1) invalidate all cached meta-data. 595 * 2) re-read superblock from disk. 596 * 3) re-read summary information from disk. 597 * 4) invalidate all inactive vnodes. 598 * 5) invalidate all cached file data. 599 * 6) re-read inode data for all active vnodes. 600 */ 601 int 602 ext2fs_reload(struct mount *mp, kauth_cred_t cred, struct lwp *l) 603 { 604 struct vnode *vp, *devvp; 605 struct inode *ip; 606 struct buf *bp; 607 struct m_ext2fs *fs; 608 struct ext2fs *newfs; 609 int i, error; 610 struct ufsmount *ump; 611 struct vnode_iterator *marker; 612 613 if ((mp->mnt_flag & MNT_RDONLY) == 0) 614 return EINVAL; 615 616 ump = VFSTOUFS(mp); 617 /* 618 * Step 1: invalidate all cached meta-data. 619 */ 620 devvp = ump->um_devvp; 621 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 622 error = vinvalbuf(devvp, 0, cred, l, 0, 0); 623 VOP_UNLOCK(devvp); 624 if (error) 625 panic("ext2fs_reload: dirty1"); 626 627 fs = ump->um_e2fs; 628 /* 629 * Step 2: re-read superblock from disk. Copy in new superblock, and 630 * compute in-memory values. 631 */ 632 error = bread(devvp, SBLOCK, SBSIZE, 0, &bp); 633 if (error) 634 return error; 635 newfs = (struct ext2fs *)bp->b_data; 636 e2fs_sbload(newfs, &fs->e2fs); 637 638 brelse(bp, 0); 639 640 error = ext2fs_sbfill(fs, (mp->mnt_flag & MNT_RDONLY) != 0); 641 if (error) 642 return error; 643 644 /* 645 * Step 3: re-read summary information from disk. 646 */ 647 for (i = 0; i < fs->e2fs_ngdb; i++) { 648 error = bread(devvp , 649 EXT2_FSBTODB(fs, fs->e2fs.e2fs_first_dblock + 650 1 /* superblock */ + i), 651 fs->e2fs_bsize, 0, &bp); 652 if (error) { 653 return error; 654 } 655 e2fs_cgload(bp->b_data, 656 &fs->e2fs_gd[i * 657 (fs->e2fs_bsize >> fs->e2fs_group_desc_shift)], 658 fs->e2fs_bsize, fs->e2fs_group_desc_shift); 659 brelse(bp, 0); 660 } 661 662 vfs_vnode_iterator_init(mp, &marker); 663 while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL))) { 664 /* 665 * Step 4: invalidate all inactive vnodes. 666 */ 667 if (vrecycle(vp)) 668 continue; 669 /* 670 * Step 5: invalidate all cached file data. 671 */ 672 if (vn_lock(vp, LK_EXCLUSIVE)) { 673 vrele(vp); 674 continue; 675 } 676 if (vinvalbuf(vp, 0, cred, l, 0, 0)) 677 panic("ext2fs_reload: dirty2"); 678 /* 679 * Step 6: re-read inode data for all active vnodes. 680 */ 681 ip = VTOI(vp); 682 error = bread(devvp, EXT2_FSBTODB(fs, ino_to_fsba(fs, ip->i_number)), 683 (int)fs->e2fs_bsize, 0, &bp); 684 if (error) { 685 vput(vp); 686 break; 687 } 688 error = ext2fs_loadvnode_content(fs, ip->i_number, bp, ip); 689 brelse(bp, 0); 690 if (error) { 691 vput(vp); 692 break; 693 } 694 695 vput(vp); 696 } 697 vfs_vnode_iterator_destroy(marker); 698 return error; 699 } 700 701 /* 702 * Common code for mount and mountroot 703 */ 704 int 705 ext2fs_mountfs(struct vnode *devvp, struct mount *mp) 706 { 707 struct lwp *l = curlwp; 708 struct ufsmount *ump; 709 struct buf *bp; 710 struct ext2fs *fs; 711 struct m_ext2fs *m_fs; 712 dev_t dev; 713 int error, i, ronly; 714 kauth_cred_t cred; 715 716 dev = devvp->v_rdev; 717 cred = l->l_cred; 718 719 /* Flush out any old buffers remaining from a previous use. */ 720 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 721 error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0); 722 VOP_UNLOCK(devvp); 723 if (error) 724 return error; 725 726 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 727 728 bp = NULL; 729 ump = NULL; 730 731 /* Read the superblock from disk, and swap it directly. */ 732 error = bread(devvp, SBLOCK, SBSIZE, 0, &bp); 733 if (error) 734 goto out; 735 fs = (struct ext2fs *)bp->b_data; 736 m_fs = kmem_zalloc(sizeof(*m_fs), KM_SLEEP); 737 e2fs_sbload(fs, &m_fs->e2fs); 738 739 brelse(bp, 0); 740 bp = NULL; 741 742 /* Once swapped, validate and fill in the superblock. */ 743 error = ext2fs_sbfill(m_fs, ronly); 744 if (error) { 745 kmem_free(m_fs, sizeof(*m_fs)); 746 goto out; 747 } 748 m_fs->e2fs_ronly = ronly; 749 750 ump = kmem_zalloc(sizeof(*ump), KM_SLEEP); 751 ump->um_fstype = UFS1; 752 ump->um_ops = &ext2fs_ufsops; 753 ump->um_e2fs = m_fs; 754 755 if (ronly == 0) { 756 if (m_fs->e2fs.e2fs_state == E2FS_ISCLEAN) 757 m_fs->e2fs.e2fs_state = 0; 758 else 759 m_fs->e2fs.e2fs_state = E2FS_ERRORS; 760 m_fs->e2fs_fmod = 1; 761 } 762 763 int32_t sh = m_fs->e2fs_bsize >> m_fs->e2fs_group_desc_shift; 764 /* XXX: should be added in ext2fs_sbfill()? */ 765 m_fs->e2fs_gd = kmem_alloc(m_fs->e2fs_ngdb * sh 766 * sizeof(struct ext2_gd), KM_SLEEP); 767 for (i = 0; i < m_fs->e2fs_ngdb; i++) { 768 error = bread(devvp, 769 EXT2_FSBTODB(m_fs, m_fs->e2fs.e2fs_first_dblock + 770 1 /* superblock */ + i), 771 m_fs->e2fs_bsize, 0, &bp); 772 if (error) 773 goto out1; 774 e2fs_cgload(bp->b_data, &m_fs->e2fs_gd[i * 775 (m_fs->e2fs_bsize >> m_fs->e2fs_group_desc_shift)], 776 m_fs->e2fs_bsize, m_fs->e2fs_group_desc_shift); 777 brelse(bp, 0); 778 bp = NULL; 779 } 780 781 error = ext2fs_cg_verify_and_initialize(devvp, m_fs, ronly); 782 if (error) 783 goto out1; 784 785 mp->mnt_data = ump; 786 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 787 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_EXT2FS); 788 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 789 mp->mnt_stat.f_namemax = EXT2FS_MAXNAMLEN; 790 mp->mnt_flag |= MNT_LOCAL; 791 mp->mnt_dev_bshift = DEV_BSHIFT; /* XXX */ 792 mp->mnt_fs_bshift = m_fs->e2fs_bshift; 793 mp->mnt_iflag |= IMNT_DTYPE | IMNT_SHRLOOKUP; 794 ump->um_flags = 0; 795 ump->um_mountp = mp; 796 ump->um_dev = dev; 797 ump->um_devvp = devvp; 798 ump->um_nindir = EXT2_NINDIR(m_fs); 799 ump->um_lognindir = ffs(EXT2_NINDIR(m_fs)) - 1; 800 ump->um_bptrtodb = m_fs->e2fs_fsbtodb; 801 ump->um_seqinc = 1; /* no frags */ 802 ump->um_maxsymlinklen = EXT2_MAXSYMLINKLEN; 803 ump->um_dirblksiz = m_fs->e2fs_bsize; 804 ump->um_maxfilesize = ((uint64_t)0x80000000 * m_fs->e2fs_bsize - 1); 805 spec_node_setmountedfs(devvp, mp); 806 return 0; 807 808 out1: 809 kmem_free(m_fs->e2fs_gd, m_fs->e2fs_ngdb * sh * sizeof(struct ext2_gd)); 810 out: 811 if (bp != NULL) 812 brelse(bp, 0); 813 if (ump) { 814 kmem_free(ump->um_e2fs, sizeof(*m_fs)); 815 kmem_free(ump, sizeof(*ump)); 816 mp->mnt_data = NULL; 817 } 818 return error; 819 } 820 821 /* 822 * unmount system call 823 */ 824 int 825 ext2fs_unmount(struct mount *mp, int mntflags) 826 { 827 struct ufsmount *ump; 828 struct m_ext2fs *fs; 829 int error, flags; 830 831 flags = 0; 832 if (mntflags & MNT_FORCE) 833 flags |= FORCECLOSE; 834 if ((error = ext2fs_flushfiles(mp, flags)) != 0) 835 return error; 836 ump = VFSTOUFS(mp); 837 fs = ump->um_e2fs; 838 if (fs->e2fs_ronly == 0 && 839 ext2fs_cgupdate(ump, MNT_WAIT) == 0 && 840 (fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) { 841 fs->e2fs.e2fs_state = E2FS_ISCLEAN; 842 (void) ext2fs_sbupdate(ump, MNT_WAIT); 843 } 844 if (ump->um_devvp->v_type != VBAD) 845 spec_node_setmountedfs(ump->um_devvp, NULL); 846 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 847 error = VOP_CLOSE(ump->um_devvp, fs->e2fs_ronly ? FREAD : FREAD|FWRITE, 848 NOCRED); 849 vput(ump->um_devvp); 850 int32_t sh = fs->e2fs_bsize >> fs->e2fs_group_desc_shift; 851 kmem_free(fs->e2fs_gd, fs->e2fs_ngdb * sh * sizeof(struct ext2_gd)); 852 kmem_free(fs, sizeof(*fs)); 853 kmem_free(ump, sizeof(*ump)); 854 mp->mnt_data = NULL; 855 mp->mnt_flag &= ~MNT_LOCAL; 856 return error; 857 } 858 859 /* 860 * Flush out all the files in a filesystem. 861 */ 862 int 863 ext2fs_flushfiles(struct mount *mp, int flags) 864 { 865 extern int doforce; 866 int error; 867 868 if (!doforce) 869 flags &= ~FORCECLOSE; 870 error = vflush(mp, NULLVP, flags); 871 return error; 872 } 873 874 /* 875 * Get file system statistics. 876 */ 877 int 878 ext2fs_statvfs(struct mount *mp, struct statvfs *sbp) 879 { 880 struct ufsmount *ump; 881 struct m_ext2fs *fs; 882 uint32_t overhead, overhead_per_group, ngdb; 883 int i, ngroups; 884 885 ump = VFSTOUFS(mp); 886 fs = ump->um_e2fs; 887 if (fs->e2fs.e2fs_magic != E2FS_MAGIC) 888 panic("ext2fs_statvfs"); 889 890 /* 891 * Compute the overhead (FS structures) 892 */ 893 overhead_per_group = 894 1 /* block bitmap */ + 895 1 /* inode bitmap */ + 896 fs->e2fs_itpg; 897 overhead = fs->e2fs.e2fs_first_dblock + 898 fs->e2fs_ncg * overhead_per_group; 899 if (EXT2F_HAS_COMPAT_FEATURE(fs, EXT2F_COMPAT_SPARSESUPER2)) { 900 /* 901 * Superblock and group descriptions is in group zero, 902 * then optionally 0, 1 or 2 extra copies. 903 */ 904 ngroups = 1 905 + (fs->e2fs.e4fs_backup_bgs[0] ? 1 : 0) 906 + (fs->e2fs.e4fs_backup_bgs[1] ? 1 : 0); 907 } else if (EXT2F_HAS_ROCOMPAT_FEATURE(fs, EXT2F_ROCOMPAT_SPARSESUPER)) { 908 for (i = 0, ngroups = 0; i < fs->e2fs_ncg; i++) { 909 if (cg_has_sb(i)) 910 ngroups++; 911 } 912 } else { 913 ngroups = fs->e2fs_ncg; 914 } 915 ngdb = fs->e2fs_ngdb; 916 if (EXT2F_HAS_COMPAT_FEATURE(fs, EXT2F_COMPAT_RESIZE)) 917 ngdb += fs->e2fs.e2fs_reserved_ngdb; 918 overhead += ngroups * (1 /* superblock */ + ngdb); 919 920 sbp->f_bsize = fs->e2fs_bsize; 921 sbp->f_frsize = MINBSIZE << fs->e2fs.e2fs_fsize; 922 sbp->f_iosize = fs->e2fs_bsize; 923 sbp->f_blocks = fs->e2fs.e2fs_bcount - overhead; 924 sbp->f_bfree = fs->e2fs.e2fs_fbcount; 925 sbp->f_bresvd = fs->e2fs.e2fs_rbcount; 926 if (sbp->f_bfree > sbp->f_bresvd) 927 sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd; 928 else 929 sbp->f_bavail = 0; 930 sbp->f_files = fs->e2fs.e2fs_icount; 931 sbp->f_ffree = fs->e2fs.e2fs_ficount; 932 sbp->f_favail = fs->e2fs.e2fs_ficount; 933 sbp->f_fresvd = 0; 934 copy_statvfs_info(sbp, mp); 935 return 0; 936 } 937 938 static bool 939 ext2fs_sync_selector(void *cl, struct vnode *vp) 940 { 941 struct inode *ip; 942 943 KASSERT(mutex_owned(vp->v_interlock)); 944 945 ip = VTOI(vp); 946 /* 947 * Skip the vnode/inode if inaccessible. 948 */ 949 if (ip == NULL || vp->v_type == VNON) 950 return false; 951 952 if (((ip->i_flag & 953 (IN_CHANGE | IN_UPDATE | IN_MODIFIED)) == 0 && 954 LIST_EMPTY(&vp->v_dirtyblkhd) && 955 (vp->v_iflag & VI_ONWORKLST) == 0)) 956 return false; 957 return true; 958 } 959 960 /* 961 * Go through the disk queues to initiate sandbagged IO; 962 * go through the inodes to write those that have been modified; 963 * initiate the writing of the super block if it has been modified. 964 */ 965 int 966 ext2fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 967 { 968 struct vnode *vp; 969 struct ufsmount *ump = VFSTOUFS(mp); 970 struct m_ext2fs *fs; 971 struct vnode_iterator *marker; 972 int error, allerror = 0; 973 974 fs = ump->um_e2fs; 975 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 976 printf("fs = %s\n", fs->e2fs_fsmnt); 977 panic("update: rofs mod"); 978 } 979 980 /* 981 * Write back each (modified) inode. 982 */ 983 vfs_vnode_iterator_init(mp, &marker); 984 while ((vp = vfs_vnode_iterator_next(marker, ext2fs_sync_selector, 985 NULL))) 986 { 987 error = vn_lock(vp, LK_EXCLUSIVE); 988 if (error) { 989 vrele(vp); 990 continue; 991 } 992 if (vp->v_type == VREG && waitfor == MNT_LAZY) 993 error = ext2fs_update(vp, NULL, NULL, 0); 994 else 995 error = VOP_FSYNC(vp, cred, 996 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 997 if (error) 998 allerror = error; 999 vput(vp); 1000 } 1001 vfs_vnode_iterator_destroy(marker); 1002 /* 1003 * Force stale file system control information to be flushed. 1004 */ 1005 if (waitfor != MNT_LAZY) { 1006 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 1007 if ((error = VOP_FSYNC(ump->um_devvp, cred, 1008 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1009 allerror = error; 1010 VOP_UNLOCK(ump->um_devvp); 1011 } 1012 /* 1013 * Write back modified superblock. 1014 */ 1015 if (fs->e2fs_fmod != 0) { 1016 fs->e2fs_fmod = 0; 1017 fs->e2fs.e2fs_wtime = time_second; 1018 if ((error = ext2fs_cgupdate(ump, waitfor))) 1019 allerror = error; 1020 } 1021 return allerror; 1022 } 1023 1024 /* 1025 * Load inode from disk and initialize vnode. 1026 */ 1027 static int 1028 ext2fs_init_vnode(struct ufsmount *ump, struct vnode *vp, ino_t ino) 1029 { 1030 struct m_ext2fs *fs; 1031 struct inode *ip; 1032 struct buf *bp; 1033 int error; 1034 1035 fs = ump->um_e2fs; 1036 1037 /* Read in the disk contents for the inode, copy into the inode. */ 1038 error = bread(ump->um_devvp, EXT2_FSBTODB(fs, ino_to_fsba(fs, ino)), 1039 (int)fs->e2fs_bsize, 0, &bp); 1040 if (error) 1041 return error; 1042 1043 /* Allocate and initialize inode. */ 1044 ip = pool_get(&ext2fs_inode_pool, PR_WAITOK); 1045 memset(ip, 0, sizeof(struct inode)); 1046 ip->i_vnode = vp; 1047 ip->i_ump = ump; 1048 ip->i_e2fs = fs; 1049 ip->i_dev = ump->um_dev; 1050 ip->i_number = ino; 1051 ip->i_e2fs_last_lblk = 0; 1052 ip->i_e2fs_last_blk = 0; 1053 1054 error = ext2fs_loadvnode_content(fs, ino, bp, ip); 1055 brelse(bp, 0); 1056 if (error) { 1057 pool_put(&ext2fs_inode_pool, ip); 1058 return error; 1059 } 1060 1061 /* If the inode was deleted, reset all fields */ 1062 if (ip->i_e2fs_dtime != 0) { 1063 ip->i_e2fs_mode = 0; 1064 (void)ext2fs_setsize(ip, 0); 1065 (void)ext2fs_setnblock(ip, 0); 1066 memset(ip->i_e2fs_blocks, 0, sizeof(ip->i_e2fs_blocks)); 1067 } 1068 1069 /* Initialise vnode with this inode. */ 1070 vp->v_tag = VT_EXT2FS; 1071 vp->v_op = ext2fs_vnodeop_p; 1072 vp->v_data = ip; 1073 1074 /* Initialize genfs node. */ 1075 genfs_node_init(vp, &ext2fs_genfsops); 1076 1077 return 0; 1078 } 1079 1080 /* 1081 * Read an inode from disk and initialize this vnode / inode pair. 1082 * Caller assures no other thread will try to load this inode. 1083 */ 1084 int 1085 ext2fs_loadvnode(struct mount *mp, struct vnode *vp, 1086 const void *key, size_t key_len, const void **new_key) 1087 { 1088 ino_t ino; 1089 struct inode *ip; 1090 struct ufsmount *ump; 1091 int error; 1092 1093 KASSERT(key_len == sizeof(ino)); 1094 memcpy(&ino, key, key_len); 1095 ump = VFSTOUFS(mp); 1096 1097 error = ext2fs_init_vnode(ump, vp, ino); 1098 if (error) 1099 return error; 1100 1101 ip = VTOI(vp); 1102 1103 /* Initialize the vnode from the inode. */ 1104 ext2fs_vinit(mp, ext2fs_specop_p, ext2fs_fifoop_p, &vp); 1105 1106 /* Finish inode initialization. */ 1107 ip->i_devvp = ump->um_devvp; 1108 vref(ip->i_devvp); 1109 1110 /* 1111 * Set up a generation number for this inode if it does not 1112 * already have one. This should only happen on old filesystems. 1113 */ 1114 1115 if (ip->i_e2fs_gen == 0) { 1116 if (++ext2gennumber < (u_long)time_second) 1117 ext2gennumber = time_second; 1118 ip->i_e2fs_gen = ext2gennumber; 1119 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1120 ip->i_flag |= IN_MODIFIED; 1121 } 1122 uvm_vnp_setsize(vp, ext2fs_size(ip)); 1123 *new_key = &ip->i_number; 1124 return 0; 1125 } 1126 1127 /* 1128 * Create a new inode on disk and initialize this vnode / inode pair. 1129 */ 1130 int 1131 ext2fs_newvnode(struct mount *mp, struct vnode *dvp, struct vnode *vp, 1132 struct vattr *vap, kauth_cred_t cred, void *extra, 1133 size_t *key_len, const void **new_key) 1134 { 1135 ino_t ino; 1136 struct inode *ip, *pdir; 1137 struct m_ext2fs *fs; 1138 struct ufsmount *ump; 1139 int error, mode; 1140 1141 KASSERT(dvp->v_mount == mp); 1142 KASSERT(vap->va_type != VNON); 1143 1144 *key_len = sizeof(ino); 1145 1146 pdir = VTOI(dvp); 1147 fs = pdir->i_e2fs; 1148 ump = VFSTOUFS(mp); 1149 mode = MAKEIMODE(vap->va_type, vap->va_mode); 1150 1151 /* Allocate fresh inode. */ 1152 error = ext2fs_valloc(dvp, mode, cred, &ino); 1153 if (error) 1154 return error; 1155 1156 /* Attach inode to vnode. */ 1157 error = ext2fs_init_vnode(ump, vp, ino); 1158 if (error) { 1159 ext2fs_vfree(dvp, ino, mode); 1160 return error; 1161 } 1162 1163 ip = VTOI(vp); 1164 1165 KASSERT(!E2FS_HAS_GD_CSUM(fs) || 1166 (fs->e2fs_gd[ino_to_cg(fs, ino)].ext2bgd_flags & 1167 h2fs16(E2FS_BG_INODE_ZEROED)) != 0); 1168 1169 /* check for already used inode; makes sense only for ZEROED itable */ 1170 if (__predict_false(ip->i_e2fs_mode && ip->i_e2fs_nlink != 0)) { 1171 printf("mode = 0%o, nlinks %d, inum = %llu, fs = %s\n", 1172 ip->i_e2fs_mode, ip->i_e2fs_nlink, 1173 (unsigned long long)ip->i_number, fs->e2fs_fsmnt); 1174 panic("ext2fs_valloc: dup alloc"); 1175 } 1176 1177 memset(ip->i_din.e2fs_din, 0, EXT2_DINODE_SIZE(fs)); 1178 1179 /* 1180 * Set up a new generation number for this inode. 1181 */ 1182 if (++ext2gennumber < time_second) 1183 ext2gennumber = time_second; 1184 ip->i_e2fs_gen = ext2gennumber; 1185 1186 ip->i_uid = kauth_cred_geteuid(cred); 1187 ip->i_e2fs_uid = ip->i_uid & 0xffff; 1188 ip->i_e2fs_gid = pdir->i_e2fs_gid; 1189 if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) { 1190 ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff; 1191 ip->i_e2fs_gid_high = pdir->i_e2fs_gid_high; 1192 } else { 1193 ip->i_e2fs_uid_high = 0; 1194 ip->i_e2fs_gid_high = 0; 1195 } 1196 ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16); 1197 ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE; 1198 ip->i_e2fs_mode = mode; 1199 vp->v_type = IFTOVT(mode); 1200 ip->i_e2fs_nlink = 1; 1201 1202 /* Authorize setting SGID if needed. */ 1203 if (ip->i_e2fs_mode & ISGID) { 1204 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, 1205 vp, NULL, genfs_can_chmod(vp, cred, ip->i_uid, ip->i_gid, 1206 mode)); 1207 if (error) 1208 ip->i_e2fs_mode &= ~ISGID; 1209 } 1210 1211 /* Initialize extra_isize according to what is set in superblock */ 1212 if (EXT2F_HAS_ROCOMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) 1213 && EXT2_DINODE_SIZE(ip->i_e2fs) > EXT2_REV0_DINODE_SIZE) { 1214 ip->i_din.e2fs_din->e2di_extra_isize = 1215 ip->i_e2fs->e2fs.e4fs_want_extra_isize; 1216 } 1217 1218 /* Set create time if possible */ 1219 if (EXT2_DINODE_FITS(ip->i_din.e2fs_din, e2di_crtime, 1220 EXT2_DINODE_SIZE(ip->i_e2fs))) { 1221 struct timespec now; 1222 vfs_timestamp(&now); 1223 EXT2_DINODE_TIME_SET(&now, ip->i_din.e2fs_din, e2di_crtime, 1224 EXT2_DINODE_SIZE(ip->i_e2fs)); 1225 } 1226 1227 /* Initialize the vnode from the inode. */ 1228 ext2fs_vinit(mp, ext2fs_specop_p, ext2fs_fifoop_p, &vp); 1229 1230 /* Finish inode initialization. */ 1231 ip->i_devvp = ump->um_devvp; 1232 vref(ip->i_devvp); 1233 1234 uvm_vnp_setsize(vp, ext2fs_size(ip)); 1235 *new_key = &ip->i_number; 1236 return 0; 1237 } 1238 1239 /* 1240 * File handle to vnode 1241 * 1242 * Have to be really careful about stale file handles: 1243 * - check that the inode number is valid 1244 * - call ext2fs_vget() to get the locked inode 1245 * - check for an unallocated inode (i_mode == 0) 1246 */ 1247 int 1248 ext2fs_fhtovp(struct mount *mp, struct fid *fhp, int lktype, struct vnode **vpp) 1249 { 1250 struct inode *ip; 1251 struct vnode *nvp; 1252 int error; 1253 struct ufid ufh; 1254 struct m_ext2fs *fs; 1255 1256 if (fhp->fid_len != sizeof(struct ufid)) 1257 return EINVAL; 1258 1259 memcpy(&ufh, fhp, sizeof(struct ufid)); 1260 fs = VFSTOUFS(mp)->um_e2fs; 1261 if ((ufh.ufid_ino < EXT2_FIRSTINO && ufh.ufid_ino != EXT2_ROOTINO) || 1262 ufh.ufid_ino >= fs->e2fs_ncg * fs->e2fs.e2fs_ipg) 1263 return ESTALE; 1264 1265 if ((error = VFS_VGET(mp, ufh.ufid_ino, lktype, &nvp)) != 0) { 1266 *vpp = NULLVP; 1267 return error; 1268 } 1269 ip = VTOI(nvp); 1270 if (ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime != 0 || 1271 ip->i_e2fs_gen != ufh.ufid_gen) { 1272 vput(nvp); 1273 *vpp = NULLVP; 1274 return ESTALE; 1275 } 1276 *vpp = nvp; 1277 return 0; 1278 } 1279 1280 /* 1281 * Vnode pointer to File handle 1282 */ 1283 /* ARGSUSED */ 1284 int 1285 ext2fs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1286 { 1287 struct inode *ip; 1288 struct ufid ufh; 1289 1290 if (*fh_size < sizeof(struct ufid)) { 1291 *fh_size = sizeof(struct ufid); 1292 return E2BIG; 1293 } 1294 *fh_size = sizeof(struct ufid); 1295 1296 ip = VTOI(vp); 1297 memset(&ufh, 0, sizeof(ufh)); 1298 ufh.ufid_len = sizeof(struct ufid); 1299 ufh.ufid_ino = ip->i_number; 1300 ufh.ufid_gen = ip->i_e2fs_gen; 1301 memcpy(fhp, &ufh, sizeof(ufh)); 1302 return 0; 1303 } 1304 1305 /* 1306 * Write a superblock and associated information back to disk. 1307 */ 1308 int 1309 ext2fs_sbupdate(struct ufsmount *mp, int waitfor) 1310 { 1311 struct m_ext2fs *fs = mp->um_e2fs; 1312 struct buf *bp; 1313 int error = 0; 1314 1315 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0); 1316 e2fs_sbsave(&fs->e2fs, (struct ext2fs*)bp->b_data); 1317 if (waitfor == MNT_WAIT) 1318 error = bwrite(bp); 1319 else 1320 bawrite(bp); 1321 return error; 1322 } 1323 1324 int 1325 ext2fs_cgupdate(struct ufsmount *mp, int waitfor) 1326 { 1327 struct m_ext2fs *fs = mp->um_e2fs; 1328 struct buf *bp; 1329 int i, error = 0, allerror = 0; 1330 1331 allerror = ext2fs_sbupdate(mp, waitfor); 1332 for (i = 0; i < fs->e2fs_ngdb; i++) { 1333 bp = getblk(mp->um_devvp, EXT2_FSBTODB(fs, 1334 fs->e2fs.e2fs_first_dblock + 1335 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0); 1336 e2fs_cgsave(&fs->e2fs_gd[i * 1337 (fs->e2fs_bsize >> fs->e2fs_group_desc_shift)], 1338 bp->b_data, fs->e2fs_bsize, fs->e2fs_group_desc_shift); 1339 if (waitfor == MNT_WAIT) 1340 error = bwrite(bp); 1341 else 1342 bawrite(bp); 1343 } 1344 1345 if (!allerror && error) 1346 allerror = error; 1347 return allerror; 1348 } 1349 1350 /* 1351 * Fill in the m_fs structure, and validate the fields of the superblock. 1352 * NOTE: here, the superblock is already swapped. 1353 */ 1354 static int 1355 ext2fs_sbfill(struct m_ext2fs *m_fs, int ronly) 1356 { 1357 uint32_t u32; 1358 struct ext2fs *fs = &m_fs->e2fs; 1359 1360 /* 1361 * General sanity checks 1362 */ 1363 if (fs->e2fs_magic != E2FS_MAGIC) 1364 return EINVAL; 1365 if (fs->e2fs_rev > E2FS_REV1) { 1366 printf("ext2fs: unsupported revision number: %#x\n", 1367 fs->e2fs_rev); 1368 return EINVAL; 1369 } 1370 if (fs->e2fs_log_bsize > 2) { 1371 /* block size = 1024|2048|4096 */ 1372 printf("ext2fs: bad block size: %d\n", fs->e2fs_log_bsize); 1373 return EINVAL; 1374 } 1375 if (fs->e2fs_bpg == 0) { 1376 printf("ext2fs: zero blocks per group\n"); 1377 return EINVAL; 1378 } 1379 if (fs->e2fs_ipg == 0) { 1380 printf("ext2fs: zero inodes per group\n"); 1381 return EINVAL; 1382 } 1383 1384 if (fs->e2fs_first_dblock >= fs->e2fs_bcount) { 1385 printf("ext2fs: invalid first data block\n"); 1386 return EINVAL; 1387 } 1388 if (fs->e2fs_rbcount > fs->e2fs_bcount || 1389 fs->e2fs_fbcount > fs->e2fs_bcount) { 1390 printf("ext2fs: invalid block count\n"); 1391 return EINVAL; 1392 } 1393 1394 /* 1395 * Compute the fields of the superblock 1396 */ 1397 u32 = fs->e2fs_bcount - fs->e2fs_first_dblock; /* > 0 */ 1398 m_fs->e2fs_ncg = howmany(u32, fs->e2fs_bpg); 1399 if (m_fs->e2fs_ncg == 0) { 1400 printf("ext2fs: invalid number of cylinder groups\n"); 1401 return EINVAL; 1402 } 1403 1404 m_fs->e2fs_fsbtodb = fs->e2fs_log_bsize + LOG_MINBSIZE - DEV_BSHIFT; 1405 m_fs->e2fs_bsize = MINBSIZE << fs->e2fs_log_bsize; 1406 m_fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs_log_bsize; 1407 m_fs->e2fs_qbmask = m_fs->e2fs_bsize - 1; 1408 m_fs->e2fs_bmask = ~m_fs->e2fs_qbmask; 1409 1410 if (!(fs->e2fs_features_incompat & EXT2F_INCOMPAT_64BIT) || 1411 (fs->e2fs_rev == E2FS_REV0)) 1412 m_fs->e2fs_group_desc_shift = 5; 1413 else { 1414 for (m_fs->e2fs_group_desc_shift = 0; 1415 (1 << m_fs->e2fs_group_desc_shift) 1416 < fs->e3fs_desc_size; 1417 m_fs->e2fs_group_desc_shift++); 1418 } 1419 1420 if ((u32 = (m_fs->e2fs_bsize >> m_fs->e2fs_group_desc_shift)) == 0) { 1421 /* Unlikely to happen */ 1422 printf("ext2fs: invalid block size\n"); 1423 return EINVAL; 1424 } 1425 m_fs->e2fs_ngdb = howmany(m_fs->e2fs_ncg, u32); 1426 if (m_fs->e2fs_ngdb == 0) { 1427 printf("ext2fs: invalid number of group descriptor blocks\n"); 1428 return EINVAL; 1429 } 1430 1431 if (m_fs->e2fs_bsize < EXT2_DINODE_SIZE(m_fs)) { 1432 printf("ext2fs: invalid inode size\n"); 1433 return EINVAL; 1434 } 1435 m_fs->e2fs_ipb = m_fs->e2fs_bsize / EXT2_DINODE_SIZE(m_fs); 1436 1437 m_fs->e2fs_itpg = fs->e2fs_ipg / m_fs->e2fs_ipb; 1438 1439 /* 1440 * Revision-specific checks 1441 */ 1442 if (fs->e2fs_rev > E2FS_REV0) { 1443 char buf[256]; 1444 if (fs->e2fs_first_ino != EXT2_FIRSTINO) { 1445 printf("ext2fs: unsupported first inode position\n"); 1446 return EINVAL; 1447 } 1448 u32 = fs->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP; 1449 if (u32) { 1450 snprintb(buf, sizeof(buf), EXT2F_INCOMPAT_BITS, u32); 1451 printf("ext2fs: unsupported incompat features: %s\n", 1452 buf); 1453 #ifndef EXT2_IGNORE_INCOMPAT_FEATURES 1454 return EINVAL; 1455 #endif 1456 } 1457 u32 = fs->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP; 1458 if (!ronly && u32) { 1459 snprintb(buf, sizeof(buf), EXT2F_ROCOMPAT_BITS, u32); 1460 printf("ext2fs: unsupported ro-incompat features: %s\n", 1461 buf); 1462 #ifndef EXT2_IGNORE_ROCOMPAT_FEATURES 1463 return EROFS; 1464 #endif 1465 } 1466 if (fs->e2fs_inode_size == 0 || !powerof2(fs->e2fs_inode_size) || fs->e2fs_inode_size > m_fs->e2fs_bsize) { 1467 printf("ext2fs: bad inode size\n"); 1468 return EINVAL; 1469 } 1470 } 1471 1472 return 0; 1473 } 1474