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 && 158 ext2_cgupdate(ump, MNT_WAIT) == 0) { 159 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 160 ext2_sbupdate(ump, MNT_WAIT); 161 } 162 fs->e2fs_ronly = 1; 163 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY); 164 g_topology_lock(); 165 g_access(ump->um_cp, 0, -1, 0); 166 g_topology_unlock(); 167 } 168 if (!error && (mp->mnt_flag & MNT_RELOAD)) 169 error = ext2_reload(mp, td); 170 if (error) 171 return (error); 172 devvp = ump->um_devvp; 173 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) { 174 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0)) 175 return (EPERM); 176 177 /* 178 * If upgrade to read-write by non-root, then verify 179 * that user has necessary permissions on the device. 180 */ 181 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 182 error = VOP_ACCESS(devvp, VREAD | VWRITE, 183 td->td_ucred, td); 184 if (error) 185 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 186 if (error) { 187 VOP_UNLOCK(devvp, 0); 188 return (error); 189 } 190 VOP_UNLOCK(devvp, 0); 191 g_topology_lock(); 192 error = g_access(ump->um_cp, 0, 1, 0); 193 g_topology_unlock(); 194 if (error) 195 return (error); 196 197 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 || 198 (fs->e2fs->e2fs_state & E2FS_ERRORS)) { 199 if (mp->mnt_flag & MNT_FORCE) { 200 printf( 201 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt); 202 } else { 203 printf( 204 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 205 fs->e2fs_fsmnt); 206 return (EPERM); 207 } 208 } 209 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; 210 (void)ext2_cgupdate(ump, MNT_WAIT); 211 fs->e2fs_ronly = 0; 212 MNT_ILOCK(mp); 213 mp->mnt_flag &= ~MNT_RDONLY; 214 MNT_IUNLOCK(mp); 215 } 216 if (vfs_flagopt(opts, "export", NULL, 0)) { 217 /* Process export requests in vfs_mount.c. */ 218 return (error); 219 } 220 } 221 222 /* 223 * Not an update, or updating the name: look up the name 224 * and verify that it refers to a sensible disk device. 225 */ 226 if (fspec == NULL) 227 return (EINVAL); 228 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 229 if ((error = namei(ndp)) != 0) 230 return (error); 231 NDFREE(ndp, NDF_ONLY_PNBUF); 232 devvp = ndp->ni_vp; 233 234 if (!vn_isdisk(devvp, &error)) { 235 vput(devvp); 236 return (error); 237 } 238 239 /* 240 * If mount by non-root, then verify that user has necessary 241 * permissions on the device. 242 * 243 * XXXRW: VOP_ACCESS() enough? 244 */ 245 accmode = VREAD; 246 if ((mp->mnt_flag & MNT_RDONLY) == 0) 247 accmode |= VWRITE; 248 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 249 if (error) 250 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 251 if (error) { 252 vput(devvp); 253 return (error); 254 } 255 256 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 257 error = ext2_mountfs(devvp, mp); 258 } else { 259 if (devvp != ump->um_devvp) { 260 vput(devvp); 261 return (EINVAL); /* needs translation */ 262 } else 263 vput(devvp); 264 } 265 if (error) { 266 vrele(devvp); 267 return (error); 268 } 269 ump = VFSTOEXT2(mp); 270 fs = ump->um_e2fs; 271 272 /* 273 * Note that this strncpy() is ok because of a check at the start 274 * of ext2_mount(). 275 */ 276 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN); 277 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0'; 278 vfs_mountedfrom(mp, fspec); 279 return (0); 280 } 281 282 static int 283 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly) 284 { 285 uint32_t i, mask; 286 287 if (es->e2fs_magic != E2FS_MAGIC) { 288 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 289 devtoname(dev), es->e2fs_magic, E2FS_MAGIC); 290 return (1); 291 } 292 if (es->e2fs_rev > E2FS_REV0) { 293 mask = es->e2fs_features_incompat & ~(EXT2F_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 static e4fs_daddr_t 322 cg_location(struct m_ext2fs *fs, int number) 323 { 324 int cg, descpb, logical_sb, has_super = 0; 325 326 /* 327 * Adjust logical superblock block number. 328 * Godmar thinks: if the blocksize is greater than 1024, then 329 * the superblock is logically part of block zero. 330 */ 331 logical_sb = fs->e2fs_bsize > SBSIZE ? 0 : 1; 332 333 if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_META_BG) || 334 number < fs->e2fs->e3fs_first_meta_bg) 335 return (logical_sb + number + 1); 336 337 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) 338 descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 339 else 340 descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 341 342 cg = descpb * number; 343 344 if (ext2_cg_has_sb(fs, cg)) 345 has_super = 1; 346 347 return (has_super + cg * (e4fs_daddr_t)EXT2_BLOCKS_PER_GROUP(fs) + 348 fs->e2fs->e2fs_first_dblock); 349 } 350 351 /* 352 * This computes the fields of the m_ext2fs structure from the 353 * data in the ext2fs structure read in. 354 */ 355 static int 356 compute_sb_data(struct vnode *devvp, struct ext2fs *es, 357 struct m_ext2fs *fs) 358 { 359 int g_count = 0, error; 360 int i, j; 361 struct buf *bp; 362 uint32_t e2fs_descpb, e2fs_gdbcount_alloc; 363 364 fs->e2fs_bcount = es->e2fs_bcount; 365 fs->e2fs_rbcount = es->e2fs_rbcount; 366 fs->e2fs_fbcount = es->e2fs_fbcount; 367 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 368 fs->e2fs_bcount |= (uint64_t)(es->e4fs_bcount_hi) << 32; 369 fs->e2fs_rbcount |= (uint64_t)(es->e4fs_rbcount_hi) << 32; 370 fs->e2fs_fbcount |= (uint64_t)(es->e4fs_fbcount_hi) << 32; 371 } 372 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 373 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 374 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 375 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 376 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 377 if (fs->e2fs_fsize) 378 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 379 fs->e2fs_bpg = es->e2fs_bpg; 380 fs->e2fs_fpg = es->e2fs_fpg; 381 fs->e2fs_ipg = es->e2fs_ipg; 382 if (es->e2fs_rev == E2FS_REV0) { 383 fs->e2fs_isize = E2FS_REV0_INODE_SIZE; 384 } else { 385 fs->e2fs_isize = es->e2fs_inode_size; 386 387 /* 388 * Simple sanity check for superblock inode size value. 389 */ 390 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 391 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 392 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 393 printf("ext2fs: invalid inode size %d\n", 394 fs->e2fs_isize); 395 return (EIO); 396 } 397 } 398 /* Check for extra isize in big inodes. */ 399 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 400 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 401 printf("ext2fs: no space for extra inode timestamps\n"); 402 return (EINVAL); 403 } 404 /* Check checksum features */ 405 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) && 406 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 407 printf("ext2fs: incorrect checksum features combination\n"); 408 return (EINVAL); 409 } 410 /* Check for group descriptor size */ 411 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) && 412 (es->e3fs_desc_size != sizeof(struct ext2_gd))) { 413 printf("ext2fs: group descriptor size unsupported %d\n", 414 es->e3fs_desc_size); 415 return (EINVAL); 416 } 417 /* Check for group size */ 418 if (fs->e2fs_bpg != fs->e2fs_bsize * 8) { 419 printf("ext2fs: non-standard group size unsupported %d\n", 420 fs->e2fs_bpg); 421 return (EINVAL); 422 } 423 424 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 425 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 426 /* s_resuid / s_resgid ? */ 427 fs->e2fs_gcount = howmany(fs->e2fs_bcount - es->e2fs_first_dblock, 428 EXT2_BLOCKS_PER_GROUP(fs)); 429 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 430 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 431 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb); 432 } else { 433 e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 434 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, 435 fs->e2fs_bsize / sizeof(struct ext2_gd)); 436 } 437 fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb); 438 fs->e2fs_gd = malloc(e2fs_gdbcount_alloc * fs->e2fs_bsize, 439 M_EXT2MNT, M_WAITOK | M_ZERO); 440 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 441 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 442 443 for (i = 0; i < fs->e2fs_gdbcount; i++) { 444 error = bread(devvp, 445 fsbtodb(fs, cg_location(fs, i)), 446 fs->e2fs_bsize, NOCRED, &bp); 447 if (error) { 448 free(fs->e2fs_contigdirs, M_EXT2MNT); 449 free(fs->e2fs_gd, M_EXT2MNT); 450 brelse(bp); 451 return (error); 452 } 453 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 454 memcpy(&fs->e2fs_gd[ 455 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 456 bp->b_data, fs->e2fs_bsize); 457 } else { 458 for (j = 0; j < e2fs_descpb && 459 g_count < fs->e2fs_gcount; j++, g_count++) 460 memcpy(&fs->e2fs_gd[g_count], 461 bp->b_data + j * E2FS_REV0_GD_SIZE, 462 E2FS_REV0_GD_SIZE); 463 } 464 brelse(bp); 465 bp = NULL; 466 } 467 /* Precompute checksum seed for all metadata */ 468 ext2_sb_csum_set_seed(fs); 469 /* Verfy cg csum */ 470 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 471 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 472 error = ext2_gd_csum_verify(fs, devvp->v_rdev); 473 if (error) 474 return (error); 475 } 476 /* Initialization for the ext2 Orlov allocator variant. */ 477 fs->e2fs_total_dir = 0; 478 for (i = 0; i < fs->e2fs_gcount; i++) 479 fs->e2fs_total_dir += e2fs_gd_get_ndirs(&fs->e2fs_gd[i]); 480 481 if (es->e2fs_rev == E2FS_REV0 || 482 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 483 fs->e2fs_maxfilesize = 0x7fffffff; 484 else { 485 fs->e2fs_maxfilesize = 0xffffffffffff; 486 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 487 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 488 } 489 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) { 490 fs->e2fs_uhash = 3; 491 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) { 492 #ifdef __CHAR_UNSIGNED__ 493 es->e4fs_flags |= E2FS_UNSIGNED_HASH; 494 fs->e2fs_uhash = 3; 495 #else 496 es->e4fs_flags |= E2FS_SIGNED_HASH; 497 #endif 498 } 499 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 500 error = ext2_sb_csum_verify(fs); 501 502 return (error); 503 } 504 505 /* 506 * Reload all incore data for a filesystem (used after running fsck on 507 * the root filesystem and finding things to fix). The filesystem must 508 * be mounted read-only. 509 * 510 * Things to do to update the mount: 511 * 1) invalidate all cached meta-data. 512 * 2) re-read superblock from disk. 513 * 3) invalidate all cluster summary information. 514 * 4) invalidate all inactive vnodes. 515 * 5) invalidate all cached file data. 516 * 6) re-read inode data for all active vnodes. 517 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 518 */ 519 static int 520 ext2_reload(struct mount *mp, struct thread *td) 521 { 522 struct vnode *vp, *mvp, *devvp; 523 struct inode *ip; 524 struct buf *bp; 525 struct ext2fs *es; 526 struct m_ext2fs *fs; 527 struct csum *sump; 528 int error, i; 529 int32_t *lp; 530 531 if ((mp->mnt_flag & MNT_RDONLY) == 0) 532 return (EINVAL); 533 /* 534 * Step 1: invalidate all cached meta-data. 535 */ 536 devvp = VFSTOEXT2(mp)->um_devvp; 537 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 538 if (vinvalbuf(devvp, 0, 0, 0) != 0) 539 panic("ext2_reload: dirty1"); 540 VOP_UNLOCK(devvp, 0); 541 542 /* 543 * Step 2: re-read superblock from disk. 544 * constants have been adjusted for ext2 545 */ 546 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 547 return (error); 548 es = (struct ext2fs *)bp->b_data; 549 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 550 brelse(bp); 551 return (EIO); /* XXX needs translation */ 552 } 553 fs = VFSTOEXT2(mp)->um_e2fs; 554 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 555 556 if ((error = compute_sb_data(devvp, es, fs)) != 0) { 557 brelse(bp); 558 return (error); 559 } 560 #ifdef UNKLAR 561 if (fs->fs_sbsize < SBSIZE) 562 bp->b_flags |= B_INVAL; 563 #endif 564 brelse(bp); 565 566 /* 567 * Step 3: invalidate all cluster summary information. 568 */ 569 if (fs->e2fs_contigsumsize > 0) { 570 lp = fs->e2fs_maxcluster; 571 sump = fs->e2fs_clustersum; 572 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 573 *lp++ = fs->e2fs_contigsumsize; 574 sump->cs_init = 0; 575 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 576 } 577 } 578 579 loop: 580 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 581 /* 582 * Step 4: invalidate all cached file data. 583 */ 584 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 585 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 586 goto loop; 587 } 588 if (vinvalbuf(vp, 0, 0, 0)) 589 panic("ext2_reload: dirty2"); 590 591 /* 592 * Step 5: re-read inode data for all active vnodes. 593 */ 594 ip = VTOI(vp); 595 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 596 (int)fs->e2fs_bsize, NOCRED, &bp); 597 if (error) { 598 VOP_UNLOCK(vp, 0); 599 vrele(vp); 600 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 601 return (error); 602 } 603 ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 604 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 605 brelse(bp); 606 VOP_UNLOCK(vp, 0); 607 vrele(vp); 608 } 609 return (0); 610 } 611 612 /* 613 * Common code for mount and mountroot. 614 */ 615 static int 616 ext2_mountfs(struct vnode *devvp, struct mount *mp) 617 { 618 struct ext2mount *ump; 619 struct buf *bp; 620 struct m_ext2fs *fs; 621 struct ext2fs *es; 622 struct cdev *dev = devvp->v_rdev; 623 struct g_consumer *cp; 624 struct bufobj *bo; 625 struct csum *sump; 626 int error; 627 int ronly; 628 int i; 629 u_long size; 630 int32_t *lp; 631 int32_t e2fs_maxcontig; 632 633 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 634 /* XXX: use VOP_ACESS to check FS perms */ 635 g_topology_lock(); 636 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 637 g_topology_unlock(); 638 VOP_UNLOCK(devvp, 0); 639 if (error) 640 return (error); 641 642 /* XXX: should we check for some sectorsize or 512 instead? */ 643 if (((SBSIZE % cp->provider->sectorsize) != 0) || 644 (SBSIZE < cp->provider->sectorsize)) { 645 g_topology_lock(); 646 g_vfs_close(cp); 647 g_topology_unlock(); 648 return (EINVAL); 649 } 650 651 bo = &devvp->v_bufobj; 652 bo->bo_private = cp; 653 bo->bo_ops = g_vfs_bufops; 654 if (devvp->v_rdev->si_iosize_max != 0) 655 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 656 if (mp->mnt_iosize_max > MAXPHYS) 657 mp->mnt_iosize_max = MAXPHYS; 658 659 bp = NULL; 660 ump = NULL; 661 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 662 goto out; 663 es = (struct ext2fs *)bp->b_data; 664 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 665 error = EINVAL; /* XXX needs translation */ 666 goto out; 667 } 668 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 669 (es->e2fs_state & E2FS_ERRORS)) { 670 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 671 printf( 672 "WARNING: Filesystem was not properly dismounted\n"); 673 } else { 674 printf( 675 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 676 error = EPERM; 677 goto out; 678 } 679 } 680 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 681 682 /* 683 * I don't know whether this is the right strategy. Note that 684 * we dynamically allocate both an m_ext2fs and an ext2fs 685 * while Linux keeps the super block in a locked buffer. 686 */ 687 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 688 M_EXT2MNT, M_WAITOK | M_ZERO); 689 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 690 M_EXT2MNT, M_WAITOK); 691 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 692 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 693 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 694 goto out; 695 696 /* 697 * Calculate the maximum contiguous blocks and size of cluster summary 698 * array. In FFS this is done by newfs; however, the superblock 699 * in ext2fs doesn't have these variables, so we can calculate 700 * them here. 701 */ 702 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 703 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 704 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 705 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 706 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 707 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 708 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 709 lp = ump->um_e2fs->e2fs_maxcluster; 710 sump = ump->um_e2fs->e2fs_clustersum; 711 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 712 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 713 sump->cs_init = 0; 714 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 715 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 716 } 717 } 718 719 brelse(bp); 720 bp = NULL; 721 fs = ump->um_e2fs; 722 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 723 724 /* 725 * If the fs is not mounted read-only, make sure the super block is 726 * always written back on a sync(). 727 */ 728 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 729 if (ronly == 0) { 730 fs->e2fs_fmod = 1; /* mark it modified */ 731 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 732 } 733 mp->mnt_data = ump; 734 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 735 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 736 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 737 MNT_ILOCK(mp); 738 mp->mnt_flag |= MNT_LOCAL; 739 MNT_IUNLOCK(mp); 740 ump->um_mountp = mp; 741 ump->um_dev = dev; 742 ump->um_devvp = devvp; 743 ump->um_bo = &devvp->v_bufobj; 744 ump->um_cp = cp; 745 746 /* 747 * Setting those two parameters allowed us to use 748 * ufs_bmap w/o changse! 749 */ 750 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 751 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 752 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 753 if (ronly == 0) 754 ext2_sbupdate(ump, MNT_WAIT); 755 /* 756 * Initialize filesystem stat information in mount struct. 757 */ 758 MNT_ILOCK(mp); 759 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 760 MNTK_USES_BCACHE; 761 MNT_IUNLOCK(mp); 762 return (0); 763 out: 764 if (bp) 765 brelse(bp); 766 if (cp != NULL) { 767 g_topology_lock(); 768 g_vfs_close(cp); 769 g_topology_unlock(); 770 } 771 if (ump) { 772 mtx_destroy(EXT2_MTX(ump)); 773 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 774 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 775 free(ump->um_e2fs->e2fs, M_EXT2MNT); 776 free(ump->um_e2fs, M_EXT2MNT); 777 free(ump, M_EXT2MNT); 778 mp->mnt_data = NULL; 779 } 780 return (error); 781 } 782 783 /* 784 * Unmount system call. 785 */ 786 static int 787 ext2_unmount(struct mount *mp, int mntflags) 788 { 789 struct ext2mount *ump; 790 struct m_ext2fs *fs; 791 struct csum *sump; 792 int error, flags, i, ronly; 793 794 flags = 0; 795 if (mntflags & MNT_FORCE) { 796 if (mp->mnt_flag & MNT_ROOTFS) 797 return (EINVAL); 798 flags |= FORCECLOSE; 799 } 800 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 801 return (error); 802 ump = VFSTOEXT2(mp); 803 fs = ump->um_e2fs; 804 ronly = fs->e2fs_ronly; 805 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 806 if (fs->e2fs_wasvalid) 807 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 808 ext2_sbupdate(ump, MNT_WAIT); 809 } 810 811 g_topology_lock(); 812 g_vfs_close(ump->um_cp); 813 g_topology_unlock(); 814 vrele(ump->um_devvp); 815 sump = fs->e2fs_clustersum; 816 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 817 free(sump->cs_sum, M_EXT2MNT); 818 free(fs->e2fs_clustersum, M_EXT2MNT); 819 free(fs->e2fs_maxcluster, M_EXT2MNT); 820 free(fs->e2fs_gd, M_EXT2MNT); 821 free(fs->e2fs_contigdirs, M_EXT2MNT); 822 free(fs->e2fs, M_EXT2MNT); 823 free(fs, M_EXT2MNT); 824 free(ump, M_EXT2MNT); 825 mp->mnt_data = NULL; 826 MNT_ILOCK(mp); 827 mp->mnt_flag &= ~MNT_LOCAL; 828 MNT_IUNLOCK(mp); 829 return (error); 830 } 831 832 /* 833 * Flush out all the files in a filesystem. 834 */ 835 static int 836 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 837 { 838 int error; 839 840 error = vflush(mp, 0, flags, td); 841 return (error); 842 } 843 844 /* 845 * Get filesystem statistics. 846 */ 847 int 848 ext2_statfs(struct mount *mp, struct statfs *sbp) 849 { 850 struct ext2mount *ump; 851 struct m_ext2fs *fs; 852 uint32_t overhead, overhead_per_group, ngdb; 853 int i, ngroups; 854 855 ump = VFSTOEXT2(mp); 856 fs = ump->um_e2fs; 857 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 858 panic("ext2_statfs"); 859 860 /* 861 * Compute the overhead (FS structures) 862 */ 863 overhead_per_group = 864 1 /* block bitmap */ + 865 1 /* inode bitmap */ + 866 fs->e2fs_itpg; 867 overhead = fs->e2fs->e2fs_first_dblock + 868 fs->e2fs_gcount * overhead_per_group; 869 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 870 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 871 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 872 if (ext2_cg_has_sb(fs, i)) 873 ngroups++; 874 } 875 } else { 876 ngroups = fs->e2fs_gcount; 877 } 878 ngdb = fs->e2fs_gdbcount; 879 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 880 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 881 ngdb += fs->e2fs->e2fs_reserved_ngdb; 882 overhead += ngroups * (1 /* superblock */ + ngdb); 883 884 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 885 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 886 sbp->f_blocks = fs->e2fs_bcount - overhead; 887 sbp->f_bfree = fs->e2fs_fbcount; 888 sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount; 889 sbp->f_files = fs->e2fs->e2fs_icount; 890 sbp->f_ffree = fs->e2fs->e2fs_ficount; 891 return (0); 892 } 893 894 /* 895 * Go through the disk queues to initiate sandbagged IO; 896 * go through the inodes to write those that have been modified; 897 * initiate the writing of the super block if it has been modified. 898 * 899 * Note: we are always called with the filesystem marked `MPBUSY'. 900 */ 901 static int 902 ext2_sync(struct mount *mp, int waitfor) 903 { 904 struct vnode *mvp, *vp; 905 struct thread *td; 906 struct inode *ip; 907 struct ext2mount *ump = VFSTOEXT2(mp); 908 struct m_ext2fs *fs; 909 int error, allerror = 0; 910 911 td = curthread; 912 fs = ump->um_e2fs; 913 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 914 printf("fs = %s\n", fs->e2fs_fsmnt); 915 panic("ext2_sync: rofs mod"); 916 } 917 918 /* 919 * Write back each (modified) inode. 920 */ 921 loop: 922 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 923 if (vp->v_type == VNON) { 924 VI_UNLOCK(vp); 925 continue; 926 } 927 ip = VTOI(vp); 928 if ((ip->i_flag & 929 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 930 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 931 waitfor == MNT_LAZY)) { 932 VI_UNLOCK(vp); 933 continue; 934 } 935 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 936 if (error) { 937 if (error == ENOENT) { 938 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 939 goto loop; 940 } 941 continue; 942 } 943 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 944 allerror = error; 945 VOP_UNLOCK(vp, 0); 946 vrele(vp); 947 } 948 949 /* 950 * Force stale filesystem control information to be flushed. 951 */ 952 if (waitfor != MNT_LAZY) { 953 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 954 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 955 allerror = error; 956 VOP_UNLOCK(ump->um_devvp, 0); 957 } 958 959 /* 960 * Write back modified superblock. 961 */ 962 if (fs->e2fs_fmod != 0) { 963 fs->e2fs_fmod = 0; 964 fs->e2fs->e2fs_wtime = time_second; 965 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 966 allerror = error; 967 } 968 return (allerror); 969 } 970 971 /* 972 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 973 * in from disk. If it is in core, wait for the lock bit to clear, then 974 * return the inode locked. Detection and handling of mount points must be 975 * done by the calling routine. 976 */ 977 static int 978 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 979 { 980 struct m_ext2fs *fs; 981 struct inode *ip; 982 struct ext2mount *ump; 983 struct buf *bp; 984 struct vnode *vp; 985 struct thread *td; 986 int i, error; 987 int used_blocks; 988 989 td = curthread; 990 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 991 if (error || *vpp != NULL) 992 return (error); 993 994 ump = VFSTOEXT2(mp); 995 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 996 997 /* Allocate a new vnode/inode. */ 998 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 999 *vpp = NULL; 1000 free(ip, M_EXT2NODE); 1001 return (error); 1002 } 1003 vp->v_data = ip; 1004 ip->i_vnode = vp; 1005 ip->i_e2fs = fs = ump->um_e2fs; 1006 ip->i_ump = ump; 1007 ip->i_number = ino; 1008 1009 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 1010 error = insmntque(vp, mp); 1011 if (error != 0) { 1012 free(ip, M_EXT2NODE); 1013 *vpp = NULL; 1014 return (error); 1015 } 1016 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 1017 if (error || *vpp != NULL) 1018 return (error); 1019 1020 /* Read in the disk contents for the inode, copy into the inode. */ 1021 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 1022 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 1023 /* 1024 * The inode does not contain anything useful, so it would 1025 * be misleading to leave it on its hash chain. With mode 1026 * still zero, it will be unlinked and returned to the free 1027 * list by vput(). 1028 */ 1029 brelse(bp); 1030 vput(vp); 1031 *vpp = NULL; 1032 return (error); 1033 } 1034 /* convert ext2 inode to dinode */ 1035 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 1036 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ino)), ip); 1037 if (error) { 1038 printf("ext2fs: Bad inode %lu csum - run fsck\n", 1039 (unsigned long)ino); 1040 brelse(bp); 1041 vput(vp); 1042 *vpp = NULL; 1043 return (error); 1044 } 1045 ip->i_block_group = ino_to_cg(fs, ino); 1046 ip->i_next_alloc_block = 0; 1047 ip->i_next_alloc_goal = 0; 1048 1049 /* 1050 * Now we want to make sure that block pointers for unused 1051 * blocks are zeroed out - ext2_balloc depends on this 1052 * although for regular files and directories only 1053 * 1054 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 1055 * out because we could corrupt the extent tree. 1056 */ 1057 if (!(ip->i_flag & IN_E4EXTENTS) && 1058 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 1059 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 1060 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 1061 ip->i_db[i] = 0; 1062 } 1063 #ifdef EXT2FS_DEBUG 1064 ext2_print_inode(ip); 1065 ext4_ext_print_extent_tree_status(ip); 1066 #endif 1067 bqrelse(bp); 1068 1069 /* 1070 * Initialize the vnode from the inode, check for aliases. 1071 * Note that the underlying vnode may have changed. 1072 */ 1073 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 1074 vput(vp); 1075 *vpp = NULL; 1076 return (error); 1077 } 1078 1079 /* 1080 * Finish inode initialization. 1081 */ 1082 1083 *vpp = vp; 1084 return (0); 1085 } 1086 1087 /* 1088 * File handle to vnode 1089 * 1090 * Have to be really careful about stale file handles: 1091 * - check that the inode number is valid 1092 * - call ext2_vget() to get the locked inode 1093 * - check for an unallocated inode (i_mode == 0) 1094 * - check that the given client host has export rights and return 1095 * those rights via. exflagsp and credanonp 1096 */ 1097 static int 1098 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1099 { 1100 struct inode *ip; 1101 struct ufid *ufhp; 1102 struct vnode *nvp; 1103 struct m_ext2fs *fs; 1104 int error; 1105 1106 ufhp = (struct ufid *)fhp; 1107 fs = VFSTOEXT2(mp)->um_e2fs; 1108 if (ufhp->ufid_ino < EXT2_ROOTINO || 1109 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1110 return (ESTALE); 1111 1112 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1113 if (error) { 1114 *vpp = NULLVP; 1115 return (error); 1116 } 1117 ip = VTOI(nvp); 1118 if (ip->i_mode == 0 || 1119 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1120 vput(nvp); 1121 *vpp = NULLVP; 1122 return (ESTALE); 1123 } 1124 *vpp = nvp; 1125 vnode_create_vobject(*vpp, 0, curthread); 1126 return (0); 1127 } 1128 1129 /* 1130 * Write a superblock and associated information back to disk. 1131 */ 1132 static int 1133 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1134 { 1135 struct m_ext2fs *fs = mp->um_e2fs; 1136 struct ext2fs *es = fs->e2fs; 1137 struct buf *bp; 1138 int error = 0; 1139 1140 es->e2fs_bcount = fs->e2fs_bcount & 0xffffffff; 1141 es->e2fs_rbcount = fs->e2fs_rbcount & 0xffffffff; 1142 es->e2fs_fbcount = fs->e2fs_fbcount & 0xffffffff; 1143 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1144 es->e4fs_bcount_hi = fs->e2fs_bcount >> 32; 1145 es->e4fs_rbcount_hi = fs->e2fs_rbcount >> 32; 1146 es->e4fs_fbcount_hi = fs->e2fs_fbcount >> 32; 1147 } 1148 1149 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1150 ext2_sb_csum_set(fs); 1151 1152 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1153 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1154 if (waitfor == MNT_WAIT) 1155 error = bwrite(bp); 1156 else 1157 bawrite(bp); 1158 1159 /* 1160 * The buffers for group descriptors, inode bitmaps and block bitmaps 1161 * are not busy at this point and are (hopefully) written by the 1162 * usual sync mechanism. No need to write them here. 1163 */ 1164 return (error); 1165 } 1166 int 1167 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1168 { 1169 struct m_ext2fs *fs = mp->um_e2fs; 1170 struct buf *bp; 1171 int i, j, g_count = 0, error = 0, allerror = 0; 1172 1173 allerror = ext2_sbupdate(mp, waitfor); 1174 1175 /* Update gd csums */ 1176 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 1177 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1178 ext2_gd_csum_set(fs); 1179 1180 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1181 bp = getblk(mp->um_devvp, fsbtodb(fs, 1182 cg_location(fs, i)), 1183 fs->e2fs_bsize, 0, 0, 0); 1184 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1185 memcpy(bp->b_data, &fs->e2fs_gd[ 1186 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1187 fs->e2fs_bsize); 1188 } else { 1189 for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE && 1190 g_count < fs->e2fs_gcount; j++, g_count++) 1191 memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE, 1192 &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE); 1193 } 1194 if (waitfor == MNT_WAIT) 1195 error = bwrite(bp); 1196 else 1197 bawrite(bp); 1198 } 1199 1200 if (!allerror && error) 1201 allerror = error; 1202 return (allerror); 1203 } 1204 1205 /* 1206 * Return the root of a filesystem. 1207 */ 1208 static int 1209 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1210 { 1211 struct vnode *nvp; 1212 int error; 1213 1214 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1215 if (error) 1216 return (error); 1217 *vpp = nvp; 1218 return (0); 1219 } 1220