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 checksum features */ 376 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) && 377 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 378 printf("ext2fs: incorrect checksum features combination\n"); 379 return (EINVAL); 380 } 381 /* Check for group descriptor size */ 382 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) && 383 (es->e3fs_desc_size != sizeof(struct ext2_gd))) { 384 printf("ext2fs: group descriptor size unsupported %d\n", 385 es->e3fs_desc_size); 386 return (EINVAL); 387 } 388 389 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 390 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 391 /* s_resuid / s_resgid ? */ 392 fs->e2fs_gcount = howmany(fs->e2fs_bcount - es->e2fs_first_dblock, 393 EXT2_BLOCKS_PER_GROUP(fs)); 394 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 395 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 396 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb); 397 } else { 398 e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 399 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, 400 fs->e2fs_bsize / sizeof(struct ext2_gd)); 401 } 402 fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb); 403 fs->e2fs_gd = mallocarray(e2fs_gdbcount_alloc, fs->e2fs_bsize, 404 M_EXT2MNT, M_WAITOK | M_ZERO); 405 fs->e2fs_contigdirs = mallocarray(fs->e2fs_gcount, 406 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 407 408 /* 409 * Adjust logic_sb_block. 410 * Godmar thinks: if the blocksize is greater than 1024, then 411 * the superblock is logically part of block zero. 412 */ 413 if (fs->e2fs_bsize > SBSIZE) 414 logic_sb_block = 0; 415 for (i = 0; i < fs->e2fs_gdbcount; i++) { 416 error = bread(devvp, 417 fsbtodb(fs, logic_sb_block + i + 1), 418 fs->e2fs_bsize, NOCRED, &bp); 419 if (error) { 420 free(fs->e2fs_contigdirs, M_EXT2MNT); 421 free(fs->e2fs_gd, M_EXT2MNT); 422 brelse(bp); 423 return (error); 424 } 425 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 426 memcpy(&fs->e2fs_gd[ 427 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 428 bp->b_data, fs->e2fs_bsize); 429 } else { 430 for (j = 0; j < e2fs_descpb && 431 g_count < fs->e2fs_gcount; j++, g_count++) 432 memcpy(&fs->e2fs_gd[g_count], 433 bp->b_data + j * E2FS_REV0_GD_SIZE, 434 E2FS_REV0_GD_SIZE); 435 } 436 brelse(bp); 437 bp = NULL; 438 } 439 /* Precompute checksum seed for all metadata */ 440 ext2_sb_csum_set_seed(fs); 441 /* Verfy cg csum */ 442 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 443 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 444 error = ext2_gd_csum_verify(fs, devvp->v_rdev); 445 if (error) 446 return (error); 447 } 448 /* Initialization for the ext2 Orlov allocator variant. */ 449 fs->e2fs_total_dir = 0; 450 for (i = 0; i < fs->e2fs_gcount; i++) 451 fs->e2fs_total_dir += e2fs_gd_get_ndirs(&fs->e2fs_gd[i]); 452 453 if (es->e2fs_rev == E2FS_REV0 || 454 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 455 fs->e2fs_maxfilesize = 0x7fffffff; 456 else { 457 fs->e2fs_maxfilesize = 0xffffffffffff; 458 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 459 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 460 } 461 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) { 462 fs->e2fs_uhash = 3; 463 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) { 464 #ifdef __CHAR_UNSIGNED__ 465 es->e4fs_flags |= E2FS_UNSIGNED_HASH; 466 fs->e2fs_uhash = 3; 467 #else 468 es->e4fs_flags |= E2FS_SIGNED_HASH; 469 #endif 470 } 471 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 472 error = ext2_sb_csum_verify(fs); 473 474 return (error); 475 } 476 477 /* 478 * Reload all incore data for a filesystem (used after running fsck on 479 * the root filesystem and finding things to fix). The filesystem must 480 * be mounted read-only. 481 * 482 * Things to do to update the mount: 483 * 1) invalidate all cached meta-data. 484 * 2) re-read superblock from disk. 485 * 3) invalidate all cluster summary information. 486 * 4) invalidate all inactive vnodes. 487 * 5) invalidate all cached file data. 488 * 6) re-read inode data for all active vnodes. 489 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 490 */ 491 static int 492 ext2_reload(struct mount *mp, struct thread *td) 493 { 494 struct vnode *vp, *mvp, *devvp; 495 struct inode *ip; 496 struct buf *bp; 497 struct ext2fs *es; 498 struct m_ext2fs *fs; 499 struct csum *sump; 500 int error, i; 501 int32_t *lp; 502 503 if ((mp->mnt_flag & MNT_RDONLY) == 0) 504 return (EINVAL); 505 /* 506 * Step 1: invalidate all cached meta-data. 507 */ 508 devvp = VFSTOEXT2(mp)->um_devvp; 509 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 510 if (vinvalbuf(devvp, 0, 0, 0) != 0) 511 panic("ext2_reload: dirty1"); 512 VOP_UNLOCK(devvp, 0); 513 514 /* 515 * Step 2: re-read superblock from disk. 516 * constants have been adjusted for ext2 517 */ 518 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 519 return (error); 520 es = (struct ext2fs *)bp->b_data; 521 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 522 brelse(bp); 523 return (EIO); /* XXX needs translation */ 524 } 525 fs = VFSTOEXT2(mp)->um_e2fs; 526 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 527 528 if ((error = compute_sb_data(devvp, es, fs)) != 0) { 529 brelse(bp); 530 return (error); 531 } 532 #ifdef UNKLAR 533 if (fs->fs_sbsize < SBSIZE) 534 bp->b_flags |= B_INVAL; 535 #endif 536 brelse(bp); 537 538 /* 539 * Step 3: invalidate all cluster summary information. 540 */ 541 if (fs->e2fs_contigsumsize > 0) { 542 lp = fs->e2fs_maxcluster; 543 sump = fs->e2fs_clustersum; 544 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 545 *lp++ = fs->e2fs_contigsumsize; 546 sump->cs_init = 0; 547 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 548 } 549 } 550 551 loop: 552 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 553 /* 554 * Step 4: invalidate all cached file data. 555 */ 556 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 557 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 558 goto loop; 559 } 560 if (vinvalbuf(vp, 0, 0, 0)) 561 panic("ext2_reload: dirty2"); 562 563 /* 564 * Step 5: re-read inode data for all active vnodes. 565 */ 566 ip = VTOI(vp); 567 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 568 (int)fs->e2fs_bsize, NOCRED, &bp); 569 if (error) { 570 VOP_UNLOCK(vp, 0); 571 vrele(vp); 572 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 573 return (error); 574 } 575 ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 576 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 577 brelse(bp); 578 VOP_UNLOCK(vp, 0); 579 vrele(vp); 580 } 581 return (0); 582 } 583 584 /* 585 * Common code for mount and mountroot. 586 */ 587 static int 588 ext2_mountfs(struct vnode *devvp, struct mount *mp) 589 { 590 struct ext2mount *ump; 591 struct buf *bp; 592 struct m_ext2fs *fs; 593 struct ext2fs *es; 594 struct cdev *dev = devvp->v_rdev; 595 struct g_consumer *cp; 596 struct bufobj *bo; 597 struct csum *sump; 598 int error; 599 int ronly; 600 int i; 601 u_long size; 602 int32_t *lp; 603 int32_t e2fs_maxcontig; 604 605 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 606 /* XXX: use VOP_ACESS to check FS perms */ 607 g_topology_lock(); 608 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 609 g_topology_unlock(); 610 VOP_UNLOCK(devvp, 0); 611 if (error) 612 return (error); 613 614 /* XXX: should we check for some sectorsize or 512 instead? */ 615 if (((SBSIZE % cp->provider->sectorsize) != 0) || 616 (SBSIZE < cp->provider->sectorsize)) { 617 g_topology_lock(); 618 g_vfs_close(cp); 619 g_topology_unlock(); 620 return (EINVAL); 621 } 622 623 bo = &devvp->v_bufobj; 624 bo->bo_private = cp; 625 bo->bo_ops = g_vfs_bufops; 626 if (devvp->v_rdev->si_iosize_max != 0) 627 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 628 if (mp->mnt_iosize_max > MAXPHYS) 629 mp->mnt_iosize_max = MAXPHYS; 630 631 bp = NULL; 632 ump = NULL; 633 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 634 goto out; 635 es = (struct ext2fs *)bp->b_data; 636 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 637 error = EINVAL; /* XXX needs translation */ 638 goto out; 639 } 640 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 641 (es->e2fs_state & E2FS_ERRORS)) { 642 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 643 printf( 644 "WARNING: Filesystem was not properly dismounted\n"); 645 } else { 646 printf( 647 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 648 error = EPERM; 649 goto out; 650 } 651 } 652 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 653 654 /* 655 * I don't know whether this is the right strategy. Note that 656 * we dynamically allocate both an m_ext2fs and an ext2fs 657 * while Linux keeps the super block in a locked buffer. 658 */ 659 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 660 M_EXT2MNT, M_WAITOK | M_ZERO); 661 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 662 M_EXT2MNT, M_WAITOK); 663 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 664 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 665 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 666 goto out; 667 668 /* 669 * Calculate the maximum contiguous blocks and size of cluster summary 670 * array. In FFS this is done by newfs; however, the superblock 671 * in ext2fs doesn't have these variables, so we can calculate 672 * them here. 673 */ 674 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 675 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 676 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 677 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 678 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 679 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 680 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 681 lp = ump->um_e2fs->e2fs_maxcluster; 682 sump = ump->um_e2fs->e2fs_clustersum; 683 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 684 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 685 sump->cs_init = 0; 686 sump->cs_sum = mallocarray( 687 ump->um_e2fs->e2fs_contigsumsize + 1, 688 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 689 } 690 } 691 692 brelse(bp); 693 bp = NULL; 694 fs = ump->um_e2fs; 695 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 696 697 /* 698 * If the fs is not mounted read-only, make sure the super block is 699 * always written back on a sync(). 700 */ 701 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 702 if (ronly == 0) { 703 fs->e2fs_fmod = 1; /* mark it modified */ 704 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 705 } 706 mp->mnt_data = ump; 707 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 708 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 709 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 710 MNT_ILOCK(mp); 711 mp->mnt_flag |= MNT_LOCAL; 712 MNT_IUNLOCK(mp); 713 ump->um_mountp = mp; 714 ump->um_dev = dev; 715 ump->um_devvp = devvp; 716 ump->um_bo = &devvp->v_bufobj; 717 ump->um_cp = cp; 718 719 /* 720 * Setting those two parameters allowed us to use 721 * ufs_bmap w/o changse! 722 */ 723 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 724 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 725 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 726 if (ronly == 0) 727 ext2_sbupdate(ump, MNT_WAIT); 728 /* 729 * Initialize filesystem stat information in mount struct. 730 */ 731 MNT_ILOCK(mp); 732 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 733 MNTK_USES_BCACHE; 734 MNT_IUNLOCK(mp); 735 return (0); 736 out: 737 if (bp) 738 brelse(bp); 739 if (cp != NULL) { 740 g_topology_lock(); 741 g_vfs_close(cp); 742 g_topology_unlock(); 743 } 744 if (ump) { 745 mtx_destroy(EXT2_MTX(ump)); 746 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 747 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 748 free(ump->um_e2fs->e2fs, M_EXT2MNT); 749 free(ump->um_e2fs, M_EXT2MNT); 750 free(ump, M_EXT2MNT); 751 mp->mnt_data = NULL; 752 } 753 return (error); 754 } 755 756 /* 757 * Unmount system call. 758 */ 759 static int 760 ext2_unmount(struct mount *mp, int mntflags) 761 { 762 struct ext2mount *ump; 763 struct m_ext2fs *fs; 764 struct csum *sump; 765 int error, flags, i, ronly; 766 767 flags = 0; 768 if (mntflags & MNT_FORCE) { 769 if (mp->mnt_flag & MNT_ROOTFS) 770 return (EINVAL); 771 flags |= FORCECLOSE; 772 } 773 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 774 return (error); 775 ump = VFSTOEXT2(mp); 776 fs = ump->um_e2fs; 777 ronly = fs->e2fs_ronly; 778 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 779 if (fs->e2fs_wasvalid) 780 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 781 ext2_sbupdate(ump, MNT_WAIT); 782 } 783 784 g_topology_lock(); 785 g_vfs_close(ump->um_cp); 786 g_topology_unlock(); 787 vrele(ump->um_devvp); 788 sump = fs->e2fs_clustersum; 789 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 790 free(sump->cs_sum, M_EXT2MNT); 791 free(fs->e2fs_clustersum, M_EXT2MNT); 792 free(fs->e2fs_maxcluster, M_EXT2MNT); 793 free(fs->e2fs_gd, M_EXT2MNT); 794 free(fs->e2fs_contigdirs, M_EXT2MNT); 795 free(fs->e2fs, M_EXT2MNT); 796 free(fs, M_EXT2MNT); 797 free(ump, M_EXT2MNT); 798 mp->mnt_data = NULL; 799 MNT_ILOCK(mp); 800 mp->mnt_flag &= ~MNT_LOCAL; 801 MNT_IUNLOCK(mp); 802 return (error); 803 } 804 805 /* 806 * Flush out all the files in a filesystem. 807 */ 808 static int 809 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 810 { 811 int error; 812 813 error = vflush(mp, 0, flags, td); 814 return (error); 815 } 816 817 /* 818 * Get filesystem statistics. 819 */ 820 int 821 ext2_statfs(struct mount *mp, struct statfs *sbp) 822 { 823 struct ext2mount *ump; 824 struct m_ext2fs *fs; 825 uint32_t overhead, overhead_per_group, ngdb; 826 int i, ngroups; 827 828 ump = VFSTOEXT2(mp); 829 fs = ump->um_e2fs; 830 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 831 panic("ext2_statfs"); 832 833 /* 834 * Compute the overhead (FS structures) 835 */ 836 overhead_per_group = 837 1 /* block bitmap */ + 838 1 /* inode bitmap */ + 839 fs->e2fs_itpg; 840 overhead = fs->e2fs->e2fs_first_dblock + 841 fs->e2fs_gcount * overhead_per_group; 842 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 843 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 844 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 845 if (ext2_cg_has_sb(fs, i)) 846 ngroups++; 847 } 848 } else { 849 ngroups = fs->e2fs_gcount; 850 } 851 ngdb = fs->e2fs_gdbcount; 852 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 853 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 854 ngdb += fs->e2fs->e2fs_reserved_ngdb; 855 overhead += ngroups * (1 /* superblock */ + ngdb); 856 857 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 858 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 859 sbp->f_blocks = fs->e2fs_bcount - overhead; 860 sbp->f_bfree = fs->e2fs_fbcount; 861 sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount; 862 sbp->f_files = fs->e2fs->e2fs_icount; 863 sbp->f_ffree = fs->e2fs->e2fs_ficount; 864 return (0); 865 } 866 867 /* 868 * Go through the disk queues to initiate sandbagged IO; 869 * go through the inodes to write those that have been modified; 870 * initiate the writing of the super block if it has been modified. 871 * 872 * Note: we are always called with the filesystem marked `MPBUSY'. 873 */ 874 static int 875 ext2_sync(struct mount *mp, int waitfor) 876 { 877 struct vnode *mvp, *vp; 878 struct thread *td; 879 struct inode *ip; 880 struct ext2mount *ump = VFSTOEXT2(mp); 881 struct m_ext2fs *fs; 882 int error, allerror = 0; 883 884 td = curthread; 885 fs = ump->um_e2fs; 886 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 887 printf("fs = %s\n", fs->e2fs_fsmnt); 888 panic("ext2_sync: rofs mod"); 889 } 890 891 /* 892 * Write back each (modified) inode. 893 */ 894 loop: 895 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 896 if (vp->v_type == VNON) { 897 VI_UNLOCK(vp); 898 continue; 899 } 900 ip = VTOI(vp); 901 if ((ip->i_flag & 902 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 903 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 904 waitfor == MNT_LAZY)) { 905 VI_UNLOCK(vp); 906 continue; 907 } 908 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 909 if (error) { 910 if (error == ENOENT) { 911 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 912 goto loop; 913 } 914 continue; 915 } 916 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 917 allerror = error; 918 VOP_UNLOCK(vp, 0); 919 vrele(vp); 920 } 921 922 /* 923 * Force stale filesystem control information to be flushed. 924 */ 925 if (waitfor != MNT_LAZY) { 926 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 927 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 928 allerror = error; 929 VOP_UNLOCK(ump->um_devvp, 0); 930 } 931 932 /* 933 * Write back modified superblock. 934 */ 935 if (fs->e2fs_fmod != 0) { 936 fs->e2fs_fmod = 0; 937 fs->e2fs->e2fs_wtime = time_second; 938 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 939 allerror = error; 940 } 941 return (allerror); 942 } 943 944 /* 945 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 946 * in from disk. If it is in core, wait for the lock bit to clear, then 947 * return the inode locked. Detection and handling of mount points must be 948 * done by the calling routine. 949 */ 950 static int 951 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 952 { 953 struct m_ext2fs *fs; 954 struct inode *ip; 955 struct ext2mount *ump; 956 struct buf *bp; 957 struct vnode *vp; 958 struct thread *td; 959 int i, error; 960 int used_blocks; 961 962 td = curthread; 963 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 964 if (error || *vpp != NULL) 965 return (error); 966 967 ump = VFSTOEXT2(mp); 968 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 969 970 /* Allocate a new vnode/inode. */ 971 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 972 *vpp = NULL; 973 free(ip, M_EXT2NODE); 974 return (error); 975 } 976 vp->v_data = ip; 977 ip->i_vnode = vp; 978 ip->i_e2fs = fs = ump->um_e2fs; 979 ip->i_ump = ump; 980 ip->i_number = ino; 981 982 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 983 error = insmntque(vp, mp); 984 if (error != 0) { 985 free(ip, M_EXT2NODE); 986 *vpp = NULL; 987 return (error); 988 } 989 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 990 if (error || *vpp != NULL) 991 return (error); 992 993 /* Read in the disk contents for the inode, copy into the inode. */ 994 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 995 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 996 /* 997 * The inode does not contain anything useful, so it would 998 * be misleading to leave it on its hash chain. With mode 999 * still zero, it will be unlinked and returned to the free 1000 * list by vput(). 1001 */ 1002 brelse(bp); 1003 vput(vp); 1004 *vpp = NULL; 1005 return (error); 1006 } 1007 /* convert ext2 inode to dinode */ 1008 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 1009 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ino)), ip); 1010 if (error) { 1011 printf("ext2fs: Bad inode %lu csum - run fsck\n", 1012 (unsigned long)ino); 1013 brelse(bp); 1014 vput(vp); 1015 *vpp = NULL; 1016 return (error); 1017 } 1018 ip->i_block_group = ino_to_cg(fs, ino); 1019 ip->i_next_alloc_block = 0; 1020 ip->i_next_alloc_goal = 0; 1021 1022 /* 1023 * Now we want to make sure that block pointers for unused 1024 * blocks are zeroed out - ext2_balloc depends on this 1025 * although for regular files and directories only 1026 * 1027 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 1028 * out because we could corrupt the extent tree. 1029 */ 1030 if (!(ip->i_flag & IN_E4EXTENTS) && 1031 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 1032 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 1033 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 1034 ip->i_db[i] = 0; 1035 } 1036 #ifdef EXT2FS_DEBUG 1037 ext2_print_inode(ip); 1038 ext4_ext_print_extent_tree_status(ip); 1039 #endif 1040 bqrelse(bp); 1041 1042 /* 1043 * Initialize the vnode from the inode, check for aliases. 1044 * Note that the underlying vnode may have changed. 1045 */ 1046 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 1047 vput(vp); 1048 *vpp = NULL; 1049 return (error); 1050 } 1051 1052 /* 1053 * Finish inode initialization. 1054 */ 1055 1056 *vpp = vp; 1057 return (0); 1058 } 1059 1060 /* 1061 * File handle to vnode 1062 * 1063 * Have to be really careful about stale file handles: 1064 * - check that the inode number is valid 1065 * - call ext2_vget() to get the locked inode 1066 * - check for an unallocated inode (i_mode == 0) 1067 * - check that the given client host has export rights and return 1068 * those rights via. exflagsp and credanonp 1069 */ 1070 static int 1071 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1072 { 1073 struct inode *ip; 1074 struct ufid *ufhp; 1075 struct vnode *nvp; 1076 struct m_ext2fs *fs; 1077 int error; 1078 1079 ufhp = (struct ufid *)fhp; 1080 fs = VFSTOEXT2(mp)->um_e2fs; 1081 if (ufhp->ufid_ino < EXT2_ROOTINO || 1082 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1083 return (ESTALE); 1084 1085 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1086 if (error) { 1087 *vpp = NULLVP; 1088 return (error); 1089 } 1090 ip = VTOI(nvp); 1091 if (ip->i_mode == 0 || 1092 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1093 vput(nvp); 1094 *vpp = NULLVP; 1095 return (ESTALE); 1096 } 1097 *vpp = nvp; 1098 vnode_create_vobject(*vpp, 0, curthread); 1099 return (0); 1100 } 1101 1102 /* 1103 * Write a superblock and associated information back to disk. 1104 */ 1105 static int 1106 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1107 { 1108 struct m_ext2fs *fs = mp->um_e2fs; 1109 struct ext2fs *es = fs->e2fs; 1110 struct buf *bp; 1111 int error = 0; 1112 1113 es->e2fs_bcount = fs->e2fs_bcount & 0xffffffff; 1114 es->e2fs_rbcount = fs->e2fs_rbcount & 0xffffffff; 1115 es->e2fs_fbcount = fs->e2fs_fbcount & 0xffffffff; 1116 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1117 es->e4fs_bcount_hi = fs->e2fs_bcount >> 32; 1118 es->e4fs_rbcount_hi = fs->e2fs_rbcount >> 32; 1119 es->e4fs_fbcount_hi = fs->e2fs_fbcount >> 32; 1120 } 1121 1122 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1123 ext2_sb_csum_set(fs); 1124 1125 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1126 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1127 if (waitfor == MNT_WAIT) 1128 error = bwrite(bp); 1129 else 1130 bawrite(bp); 1131 1132 /* 1133 * The buffers for group descriptors, inode bitmaps and block bitmaps 1134 * are not busy at this point and are (hopefully) written by the 1135 * usual sync mechanism. No need to write them here. 1136 */ 1137 return (error); 1138 } 1139 int 1140 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1141 { 1142 struct m_ext2fs *fs = mp->um_e2fs; 1143 struct buf *bp; 1144 int i, j, g_count = 0, error = 0, allerror = 0; 1145 1146 allerror = ext2_sbupdate(mp, waitfor); 1147 1148 /* Update gd csums */ 1149 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 1150 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1151 ext2_gd_csum_set(fs); 1152 1153 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1154 bp = getblk(mp->um_devvp, fsbtodb(fs, 1155 fs->e2fs->e2fs_first_dblock + 1156 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1157 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1158 memcpy(bp->b_data, &fs->e2fs_gd[ 1159 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1160 fs->e2fs_bsize); 1161 } else { 1162 for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE && 1163 g_count < fs->e2fs_gcount; j++, g_count++) 1164 memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE, 1165 &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE); 1166 } 1167 if (waitfor == MNT_WAIT) 1168 error = bwrite(bp); 1169 else 1170 bawrite(bp); 1171 } 1172 1173 if (!allerror && error) 1174 allerror = error; 1175 return (allerror); 1176 } 1177 1178 /* 1179 * Return the root of a filesystem. 1180 */ 1181 static int 1182 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1183 { 1184 struct vnode *nvp; 1185 int error; 1186 1187 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1188 if (error) 1189 return (error); 1190 *vpp = nvp; 1191 return (0); 1192 } 1193