1 /*- 2 * modified for EXT2FS support in Lites 1.1 3 * 4 * Aug 1995, Godmar Back (gback@cs.utah.edu) 5 * University of Utah, Department of Computer Science 6 */ 7 /*- 8 * SPDX-License-Identifier: BSD-3-Clause 9 * 10 * Copyright (c) 1989, 1991, 1993, 1994 11 * The Regents of the University of California. All rights reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94 38 * $FreeBSD$ 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/namei.h> 44 #include <sys/priv.h> 45 #include <sys/proc.h> 46 #include <sys/kernel.h> 47 #include <sys/vnode.h> 48 #include <sys/mount.h> 49 #include <sys/bio.h> 50 #include <sys/buf.h> 51 #include <sys/conf.h> 52 #include <sys/endian.h> 53 #include <sys/fcntl.h> 54 #include <sys/malloc.h> 55 #include <sys/stat.h> 56 #include <sys/mutex.h> 57 58 #include <geom/geom.h> 59 #include <geom/geom_vfs.h> 60 61 #include <fs/ext2fs/ext2_mount.h> 62 #include <fs/ext2fs/inode.h> 63 64 #include <fs/ext2fs/fs.h> 65 #include <fs/ext2fs/ext2fs.h> 66 #include <fs/ext2fs/ext2_dinode.h> 67 #include <fs/ext2fs/ext2_extern.h> 68 69 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td); 70 static int ext2_mountfs(struct vnode *, struct mount *); 71 static int ext2_reload(struct mount *mp, struct thread *td); 72 static int ext2_sbupdate(struct ext2mount *, int); 73 static int ext2_cgupdate(struct ext2mount *, int); 74 static vfs_unmount_t ext2_unmount; 75 static vfs_root_t ext2_root; 76 static vfs_statfs_t ext2_statfs; 77 static vfs_sync_t ext2_sync; 78 static vfs_vget_t ext2_vget; 79 static vfs_fhtovp_t ext2_fhtovp; 80 static vfs_mount_t ext2_mount; 81 82 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part"); 83 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure"); 84 85 static struct vfsops ext2fs_vfsops = { 86 .vfs_fhtovp = ext2_fhtovp, 87 .vfs_mount = ext2_mount, 88 .vfs_root = ext2_root, /* root inode via vget */ 89 .vfs_statfs = ext2_statfs, 90 .vfs_sync = ext2_sync, 91 .vfs_unmount = ext2_unmount, 92 .vfs_vget = ext2_vget, 93 }; 94 95 VFS_SET(ext2fs_vfsops, ext2fs, 0); 96 97 static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, 98 int ronly); 99 static int compute_sb_data(struct vnode * devvp, 100 struct ext2fs * es, struct m_ext2fs * fs); 101 102 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr", 103 "noclusterw", "noexec", "export", "force", "from", "multilabel", 104 "suiddir", "nosymfollow", "sync", "union", NULL }; 105 106 /* 107 * VFS Operations. 108 * 109 * mount system call 110 */ 111 static int 112 ext2_mount(struct mount *mp) 113 { 114 struct vfsoptlist *opts; 115 struct vnode *devvp; 116 struct thread *td; 117 struct ext2mount *ump = NULL; 118 struct m_ext2fs *fs; 119 struct nameidata nd, *ndp = &nd; 120 accmode_t accmode; 121 char *path, *fspec; 122 int error, flags, len; 123 124 td = curthread; 125 opts = mp->mnt_optnew; 126 127 if (vfs_filteropt(opts, ext2_opts)) 128 return (EINVAL); 129 130 vfs_getopt(opts, "fspath", (void **)&path, NULL); 131 /* Double-check the length of path.. */ 132 if (strlen(path) >= MAXMNTLEN) 133 return (ENAMETOOLONG); 134 135 fspec = NULL; 136 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 137 if (!error && fspec[len - 1] != '\0') 138 return (EINVAL); 139 140 /* 141 * If updating, check whether changing from read-only to 142 * read/write; if there is no device name, that's all we do. 143 */ 144 if (mp->mnt_flag & MNT_UPDATE) { 145 ump = VFSTOEXT2(mp); 146 fs = ump->um_e2fs; 147 error = 0; 148 if (fs->e2fs_ronly == 0 && 149 vfs_flagopt(opts, "ro", NULL, 0)) { 150 error = VFS_SYNC(mp, MNT_WAIT); 151 if (error) 152 return (error); 153 flags = WRITECLOSE; 154 if (mp->mnt_flag & MNT_FORCE) 155 flags |= FORCECLOSE; 156 error = ext2_flushfiles(mp, flags, td); 157 if (error == 0 && fs->e2fs_wasvalid && ext2_cgupdate(ump, MNT_WAIT) == 0) { 158 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 159 ext2_sbupdate(ump, MNT_WAIT); 160 } 161 fs->e2fs_ronly = 1; 162 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY); 163 g_topology_lock(); 164 g_access(ump->um_cp, 0, -1, 0); 165 g_topology_unlock(); 166 } 167 if (!error && (mp->mnt_flag & MNT_RELOAD)) 168 error = ext2_reload(mp, td); 169 if (error) 170 return (error); 171 devvp = ump->um_devvp; 172 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) { 173 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0)) 174 return (EPERM); 175 176 /* 177 * If upgrade to read-write by non-root, then verify 178 * that user has necessary permissions on the device. 179 */ 180 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 181 error = VOP_ACCESS(devvp, VREAD | VWRITE, 182 td->td_ucred, td); 183 if (error) 184 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 185 if (error) { 186 VOP_UNLOCK(devvp, 0); 187 return (error); 188 } 189 VOP_UNLOCK(devvp, 0); 190 g_topology_lock(); 191 error = g_access(ump->um_cp, 0, 1, 0); 192 g_topology_unlock(); 193 if (error) 194 return (error); 195 196 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 || 197 (fs->e2fs->e2fs_state & E2FS_ERRORS)) { 198 if (mp->mnt_flag & MNT_FORCE) { 199 printf( 200 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt); 201 } else { 202 printf( 203 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 204 fs->e2fs_fsmnt); 205 return (EPERM); 206 } 207 } 208 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; 209 (void)ext2_cgupdate(ump, MNT_WAIT); 210 fs->e2fs_ronly = 0; 211 MNT_ILOCK(mp); 212 mp->mnt_flag &= ~MNT_RDONLY; 213 MNT_IUNLOCK(mp); 214 } 215 if (vfs_flagopt(opts, "export", NULL, 0)) { 216 /* Process export requests in vfs_mount.c. */ 217 return (error); 218 } 219 } 220 221 /* 222 * Not an update, or updating the name: look up the name 223 * and verify that it refers to a sensible disk device. 224 */ 225 if (fspec == NULL) 226 return (EINVAL); 227 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 228 if ((error = namei(ndp)) != 0) 229 return (error); 230 NDFREE(ndp, NDF_ONLY_PNBUF); 231 devvp = ndp->ni_vp; 232 233 if (!vn_isdisk(devvp, &error)) { 234 vput(devvp); 235 return (error); 236 } 237 238 /* 239 * If mount by non-root, then verify that user has necessary 240 * permissions on the device. 241 * 242 * XXXRW: VOP_ACCESS() enough? 243 */ 244 accmode = VREAD; 245 if ((mp->mnt_flag & MNT_RDONLY) == 0) 246 accmode |= VWRITE; 247 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 248 if (error) 249 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 250 if (error) { 251 vput(devvp); 252 return (error); 253 } 254 255 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 256 error = ext2_mountfs(devvp, mp); 257 } else { 258 if (devvp != ump->um_devvp) { 259 vput(devvp); 260 return (EINVAL); /* needs translation */ 261 } else 262 vput(devvp); 263 } 264 if (error) { 265 vrele(devvp); 266 return (error); 267 } 268 ump = VFSTOEXT2(mp); 269 fs = ump->um_e2fs; 270 271 /* 272 * Note that this strncpy() is ok because of a check at the start 273 * of ext2_mount(). 274 */ 275 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN); 276 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0'; 277 vfs_mountedfrom(mp, fspec); 278 return (0); 279 } 280 281 static int 282 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly) 283 { 284 uint32_t i, mask; 285 286 if (es->e2fs_magic != E2FS_MAGIC) { 287 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 288 devtoname(dev), es->e2fs_magic, E2FS_MAGIC); 289 return (1); 290 } 291 if (es->e2fs_rev > E2FS_REV0) { 292 mask = es->e2fs_features_incompat & ~(EXT2F_INCOMPAT_SUPP | 293 EXT4F_RO_INCOMPAT_SUPP); 294 if (mask) { 295 printf("WARNING: mount of %s denied due to " 296 "unsupported optional features:\n", devtoname(dev)); 297 for (i = 0; 298 i < sizeof(incompat)/sizeof(struct ext2_feature); 299 i++) 300 if (mask & incompat[i].mask) 301 printf("%s ", incompat[i].name); 302 printf("\n"); 303 return (1); 304 } 305 mask = es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP; 306 if (!ronly && mask) { 307 printf("WARNING: R/W mount of %s denied due to " 308 "unsupported optional features:\n", devtoname(dev)); 309 for (i = 0; 310 i < sizeof(ro_compat)/sizeof(struct ext2_feature); 311 i++) 312 if (mask & ro_compat[i].mask) 313 printf("%s ", ro_compat[i].name); 314 printf("\n"); 315 return (1); 316 } 317 } 318 return (0); 319 } 320 321 /* 322 * This computes the fields of the m_ext2fs structure from the 323 * data in the ext2fs structure read in. 324 */ 325 static int 326 compute_sb_data(struct vnode *devvp, struct ext2fs *es, 327 struct m_ext2fs *fs) 328 { 329 int g_count = 0, error; 330 int i, j; 331 int logic_sb_block = 1; /* XXX for now */ 332 struct buf *bp; 333 uint32_t e2fs_descpb, e2fs_gdbcount_alloc; 334 335 fs->e2fs_bcount = es->e2fs_bcount; 336 fs->e2fs_rbcount = es->e2fs_rbcount; 337 fs->e2fs_fbcount = es->e2fs_fbcount; 338 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 339 fs->e2fs_bcount |= (uint64_t)(es->e4fs_bcount_hi) << 32; 340 fs->e2fs_rbcount |= (uint64_t)(es->e4fs_rbcount_hi) << 32; 341 fs->e2fs_fbcount |= (uint64_t)(es->e4fs_fbcount_hi) << 32; 342 } 343 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 344 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 345 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 346 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 347 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 348 if (fs->e2fs_fsize) 349 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 350 fs->e2fs_bpg = es->e2fs_bpg; 351 fs->e2fs_fpg = es->e2fs_fpg; 352 fs->e2fs_ipg = es->e2fs_ipg; 353 if (es->e2fs_rev == E2FS_REV0) { 354 fs->e2fs_isize = E2FS_REV0_INODE_SIZE; 355 } else { 356 fs->e2fs_isize = es->e2fs_inode_size; 357 358 /* 359 * Simple sanity check for superblock inode size value. 360 */ 361 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 362 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 363 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 364 printf("ext2fs: invalid inode size %d\n", 365 fs->e2fs_isize); 366 return (EIO); 367 } 368 } 369 /* Check for extra isize in big inodes. */ 370 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 371 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 372 printf("ext2fs: no space for extra inode timestamps\n"); 373 return (EINVAL); 374 } 375 /* Check for group descriptor size */ 376 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) && 377 (es->e3fs_desc_size != sizeof(struct ext2_gd))) { 378 printf("ext2fs: group descriptor size unsupported %d\n", 379 es->e3fs_desc_size); 380 return (EINVAL); 381 } 382 383 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 384 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 385 /* s_resuid / s_resgid ? */ 386 fs->e2fs_gcount = howmany(fs->e2fs_bcount - es->e2fs_first_dblock, 387 EXT2_BLOCKS_PER_GROUP(fs)); 388 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 389 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 390 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb); 391 } else { 392 e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 393 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, 394 fs->e2fs_bsize / sizeof(struct ext2_gd)); 395 } 396 fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb); 397 fs->e2fs_gd = malloc(e2fs_gdbcount_alloc * fs->e2fs_bsize, 398 M_EXT2MNT, M_WAITOK | M_ZERO); 399 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 400 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 401 402 /* 403 * Adjust logic_sb_block. 404 * Godmar thinks: if the blocksize is greater than 1024, then 405 * the superblock is logically part of block zero. 406 */ 407 if (fs->e2fs_bsize > SBSIZE) 408 logic_sb_block = 0; 409 for (i = 0; i < fs->e2fs_gdbcount; i++) { 410 error = bread(devvp, 411 fsbtodb(fs, logic_sb_block + i + 1), 412 fs->e2fs_bsize, NOCRED, &bp); 413 if (error) { 414 free(fs->e2fs_contigdirs, M_EXT2MNT); 415 free(fs->e2fs_gd, M_EXT2MNT); 416 brelse(bp); 417 return (error); 418 } 419 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 420 memcpy(&fs->e2fs_gd[ 421 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 422 bp->b_data, fs->e2fs_bsize); 423 } else { 424 for (j = 0; j < e2fs_descpb && 425 g_count < fs->e2fs_gcount; j++, g_count++) 426 memcpy(&fs->e2fs_gd[g_count], 427 bp->b_data + j * E2FS_REV0_GD_SIZE, 428 E2FS_REV0_GD_SIZE); 429 } 430 brelse(bp); 431 bp = NULL; 432 } 433 /* Verify cg csum */ 434 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM)) { 435 error = ext2_gd_csum_verify(fs, devvp->v_rdev); 436 if (error) 437 return (error); 438 } 439 /* Initialization for the ext2 Orlov allocator variant. */ 440 fs->e2fs_total_dir = 0; 441 for (i = 0; i < fs->e2fs_gcount; i++) 442 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs; 443 444 if (es->e2fs_rev == E2FS_REV0 || 445 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 446 fs->e2fs_maxfilesize = 0x7fffffff; 447 else { 448 fs->e2fs_maxfilesize = 0xffffffffffff; 449 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 450 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 451 } 452 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) { 453 fs->e2fs_uhash = 3; 454 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) { 455 #ifdef __CHAR_UNSIGNED__ 456 es->e4fs_flags |= E2FS_UNSIGNED_HASH; 457 fs->e2fs_uhash = 3; 458 #else 459 es->e4fs_flags |= E2FS_SIGNED_HASH; 460 #endif 461 } 462 463 return (0); 464 } 465 466 /* 467 * Reload all incore data for a filesystem (used after running fsck on 468 * the root filesystem and finding things to fix). The filesystem must 469 * be mounted read-only. 470 * 471 * Things to do to update the mount: 472 * 1) invalidate all cached meta-data. 473 * 2) re-read superblock from disk. 474 * 3) invalidate all cluster summary information. 475 * 4) invalidate all inactive vnodes. 476 * 5) invalidate all cached file data. 477 * 6) re-read inode data for all active vnodes. 478 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 479 */ 480 static int 481 ext2_reload(struct mount *mp, struct thread *td) 482 { 483 struct vnode *vp, *mvp, *devvp; 484 struct inode *ip; 485 struct buf *bp; 486 struct ext2fs *es; 487 struct m_ext2fs *fs; 488 struct csum *sump; 489 int error, i; 490 int32_t *lp; 491 492 if ((mp->mnt_flag & MNT_RDONLY) == 0) 493 return (EINVAL); 494 /* 495 * Step 1: invalidate all cached meta-data. 496 */ 497 devvp = VFSTOEXT2(mp)->um_devvp; 498 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 499 if (vinvalbuf(devvp, 0, 0, 0) != 0) 500 panic("ext2_reload: dirty1"); 501 VOP_UNLOCK(devvp, 0); 502 503 /* 504 * Step 2: re-read superblock from disk. 505 * constants have been adjusted for ext2 506 */ 507 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 508 return (error); 509 es = (struct ext2fs *)bp->b_data; 510 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 511 brelse(bp); 512 return (EIO); /* XXX needs translation */ 513 } 514 fs = VFSTOEXT2(mp)->um_e2fs; 515 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 516 517 if ((error = compute_sb_data(devvp, es, fs)) != 0) { 518 brelse(bp); 519 return (error); 520 } 521 #ifdef UNKLAR 522 if (fs->fs_sbsize < SBSIZE) 523 bp->b_flags |= B_INVAL; 524 #endif 525 brelse(bp); 526 527 /* 528 * Step 3: invalidate all cluster summary information. 529 */ 530 if (fs->e2fs_contigsumsize > 0) { 531 lp = fs->e2fs_maxcluster; 532 sump = fs->e2fs_clustersum; 533 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 534 *lp++ = fs->e2fs_contigsumsize; 535 sump->cs_init = 0; 536 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 537 } 538 } 539 540 loop: 541 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 542 /* 543 * Step 4: invalidate all cached file data. 544 */ 545 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 546 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 547 goto loop; 548 } 549 if (vinvalbuf(vp, 0, 0, 0)) 550 panic("ext2_reload: dirty2"); 551 552 /* 553 * Step 5: re-read inode data for all active vnodes. 554 */ 555 ip = VTOI(vp); 556 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 557 (int)fs->e2fs_bsize, NOCRED, &bp); 558 if (error) { 559 VOP_UNLOCK(vp, 0); 560 vrele(vp); 561 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 562 return (error); 563 } 564 ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 565 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 566 brelse(bp); 567 VOP_UNLOCK(vp, 0); 568 vrele(vp); 569 } 570 return (0); 571 } 572 573 /* 574 * Common code for mount and mountroot. 575 */ 576 static int 577 ext2_mountfs(struct vnode *devvp, struct mount *mp) 578 { 579 struct ext2mount *ump; 580 struct buf *bp; 581 struct m_ext2fs *fs; 582 struct ext2fs *es; 583 struct cdev *dev = devvp->v_rdev; 584 struct g_consumer *cp; 585 struct bufobj *bo; 586 struct csum *sump; 587 int error; 588 int ronly; 589 int i; 590 u_long size; 591 int32_t *lp; 592 int32_t e2fs_maxcontig; 593 594 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 595 /* XXX: use VOP_ACESS to check FS perms */ 596 g_topology_lock(); 597 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 598 g_topology_unlock(); 599 VOP_UNLOCK(devvp, 0); 600 if (error) 601 return (error); 602 603 /* XXX: should we check for some sectorsize or 512 instead? */ 604 if (((SBSIZE % cp->provider->sectorsize) != 0) || 605 (SBSIZE < cp->provider->sectorsize)) { 606 g_topology_lock(); 607 g_vfs_close(cp); 608 g_topology_unlock(); 609 return (EINVAL); 610 } 611 612 bo = &devvp->v_bufobj; 613 bo->bo_private = cp; 614 bo->bo_ops = g_vfs_bufops; 615 if (devvp->v_rdev->si_iosize_max != 0) 616 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 617 if (mp->mnt_iosize_max > MAXPHYS) 618 mp->mnt_iosize_max = MAXPHYS; 619 620 bp = NULL; 621 ump = NULL; 622 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 623 goto out; 624 es = (struct ext2fs *)bp->b_data; 625 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 626 error = EINVAL; /* XXX needs translation */ 627 goto out; 628 } 629 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 630 (es->e2fs_state & E2FS_ERRORS)) { 631 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 632 printf( 633 "WARNING: Filesystem was not properly dismounted\n"); 634 } else { 635 printf( 636 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 637 error = EPERM; 638 goto out; 639 } 640 } 641 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 642 643 /* 644 * I don't know whether this is the right strategy. Note that 645 * we dynamically allocate both an m_ext2fs and an ext2fs 646 * while Linux keeps the super block in a locked buffer. 647 */ 648 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 649 M_EXT2MNT, M_WAITOK | M_ZERO); 650 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 651 M_EXT2MNT, M_WAITOK); 652 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 653 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 654 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 655 goto out; 656 657 /* 658 * Calculate the maximum contiguous blocks and size of cluster summary 659 * array. In FFS this is done by newfs; however, the superblock 660 * in ext2fs doesn't have these variables, so we can calculate 661 * them here. 662 */ 663 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 664 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 665 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 666 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 667 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 668 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 669 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 670 lp = ump->um_e2fs->e2fs_maxcluster; 671 sump = ump->um_e2fs->e2fs_clustersum; 672 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 673 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 674 sump->cs_init = 0; 675 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 676 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 677 } 678 } 679 680 brelse(bp); 681 bp = NULL; 682 fs = ump->um_e2fs; 683 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 684 685 /* 686 * If the fs is not mounted read-only, make sure the super block is 687 * always written back on a sync(). 688 */ 689 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 690 if (ronly == 0) { 691 fs->e2fs_fmod = 1; /* mark it modified */ 692 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 693 } 694 mp->mnt_data = ump; 695 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 696 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 697 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 698 MNT_ILOCK(mp); 699 mp->mnt_flag |= MNT_LOCAL; 700 MNT_IUNLOCK(mp); 701 ump->um_mountp = mp; 702 ump->um_dev = dev; 703 ump->um_devvp = devvp; 704 ump->um_bo = &devvp->v_bufobj; 705 ump->um_cp = cp; 706 707 /* 708 * Setting those two parameters allowed us to use 709 * ufs_bmap w/o changse! 710 */ 711 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 712 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 713 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 714 if (ronly == 0) 715 ext2_sbupdate(ump, MNT_WAIT); 716 /* 717 * Initialize filesystem stat information in mount struct. 718 */ 719 MNT_ILOCK(mp); 720 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 721 MNTK_USES_BCACHE; 722 MNT_IUNLOCK(mp); 723 return (0); 724 out: 725 if (bp) 726 brelse(bp); 727 if (cp != NULL) { 728 g_topology_lock(); 729 g_vfs_close(cp); 730 g_topology_unlock(); 731 } 732 if (ump) { 733 mtx_destroy(EXT2_MTX(ump)); 734 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 735 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 736 free(ump->um_e2fs->e2fs, M_EXT2MNT); 737 free(ump->um_e2fs, M_EXT2MNT); 738 free(ump, M_EXT2MNT); 739 mp->mnt_data = NULL; 740 } 741 return (error); 742 } 743 744 /* 745 * Unmount system call. 746 */ 747 static int 748 ext2_unmount(struct mount *mp, int mntflags) 749 { 750 struct ext2mount *ump; 751 struct m_ext2fs *fs; 752 struct csum *sump; 753 int error, flags, i, ronly; 754 755 flags = 0; 756 if (mntflags & MNT_FORCE) { 757 if (mp->mnt_flag & MNT_ROOTFS) 758 return (EINVAL); 759 flags |= FORCECLOSE; 760 } 761 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 762 return (error); 763 ump = VFSTOEXT2(mp); 764 fs = ump->um_e2fs; 765 ronly = fs->e2fs_ronly; 766 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 767 if (fs->e2fs_wasvalid) 768 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 769 ext2_sbupdate(ump, MNT_WAIT); 770 } 771 772 g_topology_lock(); 773 g_vfs_close(ump->um_cp); 774 g_topology_unlock(); 775 vrele(ump->um_devvp); 776 sump = fs->e2fs_clustersum; 777 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 778 free(sump->cs_sum, M_EXT2MNT); 779 free(fs->e2fs_clustersum, M_EXT2MNT); 780 free(fs->e2fs_maxcluster, M_EXT2MNT); 781 free(fs->e2fs_gd, M_EXT2MNT); 782 free(fs->e2fs_contigdirs, M_EXT2MNT); 783 free(fs->e2fs, M_EXT2MNT); 784 free(fs, M_EXT2MNT); 785 free(ump, M_EXT2MNT); 786 mp->mnt_data = NULL; 787 MNT_ILOCK(mp); 788 mp->mnt_flag &= ~MNT_LOCAL; 789 MNT_IUNLOCK(mp); 790 return (error); 791 } 792 793 /* 794 * Flush out all the files in a filesystem. 795 */ 796 static int 797 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 798 { 799 int error; 800 801 error = vflush(mp, 0, flags, td); 802 return (error); 803 } 804 805 /* 806 * Get filesystem statistics. 807 */ 808 int 809 ext2_statfs(struct mount *mp, struct statfs *sbp) 810 { 811 struct ext2mount *ump; 812 struct m_ext2fs *fs; 813 uint32_t overhead, overhead_per_group, ngdb; 814 int i, ngroups; 815 816 ump = VFSTOEXT2(mp); 817 fs = ump->um_e2fs; 818 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 819 panic("ext2_statfs"); 820 821 /* 822 * Compute the overhead (FS structures) 823 */ 824 overhead_per_group = 825 1 /* block bitmap */ + 826 1 /* inode bitmap */ + 827 fs->e2fs_itpg; 828 overhead = fs->e2fs->e2fs_first_dblock + 829 fs->e2fs_gcount * overhead_per_group; 830 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 831 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 832 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 833 if (ext2_cg_has_sb(fs, i)) 834 ngroups++; 835 } 836 } else { 837 ngroups = fs->e2fs_gcount; 838 } 839 ngdb = fs->e2fs_gdbcount; 840 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 841 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 842 ngdb += fs->e2fs->e2fs_reserved_ngdb; 843 overhead += ngroups * (1 /* superblock */ + ngdb); 844 845 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 846 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 847 sbp->f_blocks = fs->e2fs_bcount - overhead; 848 sbp->f_bfree = fs->e2fs_fbcount; 849 sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount; 850 sbp->f_files = fs->e2fs->e2fs_icount; 851 sbp->f_ffree = fs->e2fs->e2fs_ficount; 852 return (0); 853 } 854 855 /* 856 * Go through the disk queues to initiate sandbagged IO; 857 * go through the inodes to write those that have been modified; 858 * initiate the writing of the super block if it has been modified. 859 * 860 * Note: we are always called with the filesystem marked `MPBUSY'. 861 */ 862 static int 863 ext2_sync(struct mount *mp, int waitfor) 864 { 865 struct vnode *mvp, *vp; 866 struct thread *td; 867 struct inode *ip; 868 struct ext2mount *ump = VFSTOEXT2(mp); 869 struct m_ext2fs *fs; 870 int error, allerror = 0; 871 872 td = curthread; 873 fs = ump->um_e2fs; 874 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 875 printf("fs = %s\n", fs->e2fs_fsmnt); 876 panic("ext2_sync: rofs mod"); 877 } 878 879 /* 880 * Write back each (modified) inode. 881 */ 882 loop: 883 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 884 if (vp->v_type == VNON) { 885 VI_UNLOCK(vp); 886 continue; 887 } 888 ip = VTOI(vp); 889 if ((ip->i_flag & 890 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 891 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 892 waitfor == MNT_LAZY)) { 893 VI_UNLOCK(vp); 894 continue; 895 } 896 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 897 if (error) { 898 if (error == ENOENT) { 899 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 900 goto loop; 901 } 902 continue; 903 } 904 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 905 allerror = error; 906 VOP_UNLOCK(vp, 0); 907 vrele(vp); 908 } 909 910 /* 911 * Force stale filesystem control information to be flushed. 912 */ 913 if (waitfor != MNT_LAZY) { 914 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 915 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 916 allerror = error; 917 VOP_UNLOCK(ump->um_devvp, 0); 918 } 919 920 /* 921 * Write back modified superblock. 922 */ 923 if (fs->e2fs_fmod != 0) { 924 fs->e2fs_fmod = 0; 925 fs->e2fs->e2fs_wtime = time_second; 926 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 927 allerror = error; 928 } 929 return (allerror); 930 } 931 932 /* 933 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 934 * in from disk. If it is in core, wait for the lock bit to clear, then 935 * return the inode locked. Detection and handling of mount points must be 936 * done by the calling routine. 937 */ 938 static int 939 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 940 { 941 struct m_ext2fs *fs; 942 struct inode *ip; 943 struct ext2mount *ump; 944 struct buf *bp; 945 struct vnode *vp; 946 struct thread *td; 947 int i, error; 948 int used_blocks; 949 950 td = curthread; 951 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 952 if (error || *vpp != NULL) 953 return (error); 954 955 ump = VFSTOEXT2(mp); 956 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 957 958 /* Allocate a new vnode/inode. */ 959 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 960 *vpp = NULL; 961 free(ip, M_EXT2NODE); 962 return (error); 963 } 964 vp->v_data = ip; 965 ip->i_vnode = vp; 966 ip->i_e2fs = fs = ump->um_e2fs; 967 ip->i_ump = ump; 968 ip->i_number = ino; 969 970 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 971 error = insmntque(vp, mp); 972 if (error != 0) { 973 free(ip, M_EXT2NODE); 974 *vpp = NULL; 975 return (error); 976 } 977 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 978 if (error || *vpp != NULL) 979 return (error); 980 981 /* Read in the disk contents for the inode, copy into the inode. */ 982 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 983 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 984 /* 985 * The inode does not contain anything useful, so it would 986 * be misleading to leave it on its hash chain. With mode 987 * still zero, it will be unlinked and returned to the free 988 * list by vput(). 989 */ 990 brelse(bp); 991 vput(vp); 992 *vpp = NULL; 993 return (error); 994 } 995 /* convert ext2 inode to dinode */ 996 ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 997 ino_to_fsbo(fs, ino)), ip); 998 ip->i_block_group = ino_to_cg(fs, ino); 999 ip->i_next_alloc_block = 0; 1000 ip->i_next_alloc_goal = 0; 1001 1002 /* 1003 * Now we want to make sure that block pointers for unused 1004 * blocks are zeroed out - ext2_balloc depends on this 1005 * although for regular files and directories only 1006 * 1007 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 1008 * out because we could corrupt the extent tree. 1009 */ 1010 if (!(ip->i_flag & IN_E4EXTENTS) && 1011 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 1012 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 1013 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 1014 ip->i_db[i] = 0; 1015 } 1016 #ifdef EXT2FS_DEBUG 1017 ext2_print_inode(ip); 1018 ext4_ext_print_extent_tree_status(ip); 1019 #endif 1020 bqrelse(bp); 1021 1022 /* 1023 * Initialize the vnode from the inode, check for aliases. 1024 * Note that the underlying vnode may have changed. 1025 */ 1026 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 1027 vput(vp); 1028 *vpp = NULL; 1029 return (error); 1030 } 1031 1032 /* 1033 * Finish inode initialization. 1034 */ 1035 1036 *vpp = vp; 1037 return (0); 1038 } 1039 1040 /* 1041 * File handle to vnode 1042 * 1043 * Have to be really careful about stale file handles: 1044 * - check that the inode number is valid 1045 * - call ext2_vget() to get the locked inode 1046 * - check for an unallocated inode (i_mode == 0) 1047 * - check that the given client host has export rights and return 1048 * those rights via. exflagsp and credanonp 1049 */ 1050 static int 1051 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1052 { 1053 struct inode *ip; 1054 struct ufid *ufhp; 1055 struct vnode *nvp; 1056 struct m_ext2fs *fs; 1057 int error; 1058 1059 ufhp = (struct ufid *)fhp; 1060 fs = VFSTOEXT2(mp)->um_e2fs; 1061 if (ufhp->ufid_ino < EXT2_ROOTINO || 1062 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1063 return (ESTALE); 1064 1065 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1066 if (error) { 1067 *vpp = NULLVP; 1068 return (error); 1069 } 1070 ip = VTOI(nvp); 1071 if (ip->i_mode == 0 || 1072 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1073 vput(nvp); 1074 *vpp = NULLVP; 1075 return (ESTALE); 1076 } 1077 *vpp = nvp; 1078 vnode_create_vobject(*vpp, 0, curthread); 1079 return (0); 1080 } 1081 1082 /* 1083 * Write a superblock and associated information back to disk. 1084 */ 1085 static int 1086 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1087 { 1088 struct m_ext2fs *fs = mp->um_e2fs; 1089 struct ext2fs *es = fs->e2fs; 1090 struct buf *bp; 1091 int error = 0; 1092 1093 es->e2fs_bcount = fs->e2fs_bcount & 0xffffffff; 1094 es->e2fs_rbcount = fs->e2fs_rbcount & 0xffffffff; 1095 es->e2fs_fbcount = fs->e2fs_fbcount & 0xffffffff; 1096 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1097 es->e4fs_bcount_hi = fs->e2fs_bcount >> 32; 1098 es->e4fs_rbcount_hi = fs->e2fs_rbcount >> 32; 1099 es->e4fs_fbcount_hi = fs->e2fs_fbcount >> 32; 1100 } 1101 1102 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1103 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1104 if (waitfor == MNT_WAIT) 1105 error = bwrite(bp); 1106 else 1107 bawrite(bp); 1108 1109 /* 1110 * The buffers for group descriptors, inode bitmaps and block bitmaps 1111 * are not busy at this point and are (hopefully) written by the 1112 * usual sync mechanism. No need to write them here. 1113 */ 1114 return (error); 1115 } 1116 int 1117 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1118 { 1119 struct m_ext2fs *fs = mp->um_e2fs; 1120 struct buf *bp; 1121 int i, j, g_count = 0, error = 0, allerror = 0; 1122 1123 allerror = ext2_sbupdate(mp, waitfor); 1124 1125 /* Update gd csums */ 1126 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM)) 1127 ext2_gd_csum_set(fs); 1128 1129 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1130 bp = getblk(mp->um_devvp, fsbtodb(fs, 1131 fs->e2fs->e2fs_first_dblock + 1132 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1133 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1134 memcpy(bp->b_data, &fs->e2fs_gd[ 1135 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1136 fs->e2fs_bsize); 1137 } else { 1138 for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE && 1139 g_count < fs->e2fs_gcount; j++, g_count++) 1140 memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE, 1141 &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE); 1142 } 1143 if (waitfor == MNT_WAIT) 1144 error = bwrite(bp); 1145 else 1146 bawrite(bp); 1147 } 1148 1149 if (!allerror && error) 1150 allerror = error; 1151 return (allerror); 1152 } 1153 1154 /* 1155 * Return the root of a filesystem. 1156 */ 1157 static int 1158 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1159 { 1160 struct vnode *nvp; 1161 int error; 1162 1163 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1164 if (error) 1165 return (error); 1166 *vpp = nvp; 1167 return (0); 1168 } 1169