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/fs.h> 62 #include <fs/ext2fs/ext2_mount.h> 63 #include <fs/ext2fs/inode.h> 64 65 #include <fs/ext2fs/ext2fs.h> 66 #include <fs/ext2fs/ext2_dinode.h> 67 #include <fs/ext2fs/ext2_extern.h> 68 #include <fs/ext2fs/ext2_extents.h> 69 70 71 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td); 72 static int ext2_mountfs(struct vnode *, struct mount *); 73 static int ext2_reload(struct mount *mp, struct thread *td); 74 static int ext2_sbupdate(struct ext2mount *, int); 75 static int ext2_cgupdate(struct ext2mount *, int); 76 static vfs_unmount_t ext2_unmount; 77 static vfs_root_t ext2_root; 78 static vfs_statfs_t ext2_statfs; 79 static vfs_sync_t ext2_sync; 80 static vfs_vget_t ext2_vget; 81 static vfs_fhtovp_t ext2_fhtovp; 82 static vfs_mount_t ext2_mount; 83 84 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part"); 85 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure"); 86 87 static struct vfsops ext2fs_vfsops = { 88 .vfs_fhtovp = ext2_fhtovp, 89 .vfs_mount = ext2_mount, 90 .vfs_root = ext2_root, /* root inode via vget */ 91 .vfs_statfs = ext2_statfs, 92 .vfs_sync = ext2_sync, 93 .vfs_unmount = ext2_unmount, 94 .vfs_vget = ext2_vget, 95 }; 96 97 VFS_SET(ext2fs_vfsops, ext2fs, 0); 98 99 static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, 100 int ronly); 101 static int compute_sb_data(struct vnode * devvp, 102 struct ext2fs * es, struct m_ext2fs * fs); 103 104 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr", 105 "noclusterw", "noexec", "export", "force", "from", "multilabel", 106 "suiddir", "nosymfollow", "sync", "union", NULL }; 107 108 /* 109 * VFS Operations. 110 * 111 * mount system call 112 */ 113 static int 114 ext2_mount(struct mount *mp) 115 { 116 struct vfsoptlist *opts; 117 struct vnode *devvp; 118 struct thread *td; 119 struct ext2mount *ump = NULL; 120 struct m_ext2fs *fs; 121 struct nameidata nd, *ndp = &nd; 122 accmode_t accmode; 123 char *path, *fspec; 124 int error, flags, len; 125 126 td = curthread; 127 opts = mp->mnt_optnew; 128 129 if (vfs_filteropt(opts, ext2_opts)) 130 return (EINVAL); 131 132 vfs_getopt(opts, "fspath", (void **)&path, NULL); 133 /* Double-check the length of path.. */ 134 if (strlen(path) >= MAXMNTLEN) 135 return (ENAMETOOLONG); 136 137 fspec = NULL; 138 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 139 if (!error && fspec[len - 1] != '\0') 140 return (EINVAL); 141 142 /* 143 * If updating, check whether changing from read-only to 144 * read/write; if there is no device name, that's all we do. 145 */ 146 if (mp->mnt_flag & MNT_UPDATE) { 147 ump = VFSTOEXT2(mp); 148 fs = ump->um_e2fs; 149 error = 0; 150 if (fs->e2fs_ronly == 0 && 151 vfs_flagopt(opts, "ro", NULL, 0)) { 152 error = VFS_SYNC(mp, MNT_WAIT); 153 if (error) 154 return (error); 155 flags = WRITECLOSE; 156 if (mp->mnt_flag & MNT_FORCE) 157 flags |= FORCECLOSE; 158 error = ext2_flushfiles(mp, flags, td); 159 if (error == 0 && fs->e2fs_wasvalid && 160 ext2_cgupdate(ump, MNT_WAIT) == 0) { 161 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 162 ext2_sbupdate(ump, MNT_WAIT); 163 } 164 fs->e2fs_ronly = 1; 165 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY); 166 g_topology_lock(); 167 g_access(ump->um_cp, 0, -1, 0); 168 g_topology_unlock(); 169 } 170 if (!error && (mp->mnt_flag & MNT_RELOAD)) 171 error = ext2_reload(mp, td); 172 if (error) 173 return (error); 174 devvp = ump->um_devvp; 175 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) { 176 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0)) 177 return (EPERM); 178 179 /* 180 * If upgrade to read-write by non-root, then verify 181 * that user has necessary permissions on the device. 182 */ 183 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 184 error = VOP_ACCESS(devvp, VREAD | VWRITE, 185 td->td_ucred, td); 186 if (error) 187 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 188 if (error) { 189 VOP_UNLOCK(devvp, 0); 190 return (error); 191 } 192 VOP_UNLOCK(devvp, 0); 193 g_topology_lock(); 194 error = g_access(ump->um_cp, 0, 1, 0); 195 g_topology_unlock(); 196 if (error) 197 return (error); 198 199 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 || 200 (fs->e2fs->e2fs_state & E2FS_ERRORS)) { 201 if (mp->mnt_flag & MNT_FORCE) { 202 printf( 203 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt); 204 } else { 205 printf( 206 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 207 fs->e2fs_fsmnt); 208 return (EPERM); 209 } 210 } 211 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; 212 (void)ext2_cgupdate(ump, MNT_WAIT); 213 fs->e2fs_ronly = 0; 214 MNT_ILOCK(mp); 215 mp->mnt_flag &= ~MNT_RDONLY; 216 MNT_IUNLOCK(mp); 217 } 218 if (vfs_flagopt(opts, "export", NULL, 0)) { 219 /* Process export requests in vfs_mount.c. */ 220 return (error); 221 } 222 } 223 224 /* 225 * Not an update, or updating the name: look up the name 226 * and verify that it refers to a sensible disk device. 227 */ 228 if (fspec == NULL) 229 return (EINVAL); 230 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 231 if ((error = namei(ndp)) != 0) 232 return (error); 233 NDFREE(ndp, NDF_ONLY_PNBUF); 234 devvp = ndp->ni_vp; 235 236 if (!vn_isdisk(devvp, &error)) { 237 vput(devvp); 238 return (error); 239 } 240 241 /* 242 * If mount by non-root, then verify that user has necessary 243 * permissions on the device. 244 * 245 * XXXRW: VOP_ACCESS() enough? 246 */ 247 accmode = VREAD; 248 if ((mp->mnt_flag & MNT_RDONLY) == 0) 249 accmode |= VWRITE; 250 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 251 if (error) 252 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 253 if (error) { 254 vput(devvp); 255 return (error); 256 } 257 258 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 259 error = ext2_mountfs(devvp, mp); 260 } else { 261 if (devvp != ump->um_devvp) { 262 vput(devvp); 263 return (EINVAL); /* needs translation */ 264 } else 265 vput(devvp); 266 } 267 if (error) { 268 vrele(devvp); 269 return (error); 270 } 271 ump = VFSTOEXT2(mp); 272 fs = ump->um_e2fs; 273 274 /* 275 * Note that this strncpy() is ok because of a check at the start 276 * of ext2_mount(). 277 */ 278 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN); 279 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0'; 280 vfs_mountedfrom(mp, fspec); 281 return (0); 282 } 283 284 static int 285 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly) 286 { 287 uint32_t i, mask; 288 289 if (es->e2fs_magic != E2FS_MAGIC) { 290 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 291 devtoname(dev), es->e2fs_magic, E2FS_MAGIC); 292 return (1); 293 } 294 if (es->e2fs_rev > E2FS_REV0) { 295 mask = es->e2fs_features_incompat & ~(EXT2F_INCOMPAT_SUPP); 296 if (mask) { 297 printf("WARNING: mount of %s denied due to " 298 "unsupported optional features:\n", devtoname(dev)); 299 for (i = 0; 300 i < sizeof(incompat)/sizeof(struct ext2_feature); 301 i++) 302 if (mask & incompat[i].mask) 303 printf("%s ", incompat[i].name); 304 printf("\n"); 305 return (1); 306 } 307 mask = es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP; 308 if (!ronly && mask) { 309 printf("WARNING: R/W mount of %s denied due to " 310 "unsupported optional features:\n", devtoname(dev)); 311 for (i = 0; 312 i < sizeof(ro_compat)/sizeof(struct ext2_feature); 313 i++) 314 if (mask & ro_compat[i].mask) 315 printf("%s ", ro_compat[i].name); 316 printf("\n"); 317 return (1); 318 } 319 } 320 return (0); 321 } 322 323 static e4fs_daddr_t 324 cg_location(struct m_ext2fs *fs, int number) 325 { 326 int cg, descpb, logical_sb, has_super = 0; 327 328 /* 329 * Adjust logical superblock block number. 330 * Godmar thinks: if the blocksize is greater than 1024, then 331 * the superblock is logically part of block zero. 332 */ 333 logical_sb = fs->e2fs_bsize > SBSIZE ? 0 : 1; 334 335 if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_META_BG) || 336 number < fs->e2fs->e3fs_first_meta_bg) 337 return (logical_sb + number + 1); 338 339 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) 340 descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 341 else 342 descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 343 344 cg = descpb * number; 345 346 if (ext2_cg_has_sb(fs, cg)) 347 has_super = 1; 348 349 return (has_super + cg * (e4fs_daddr_t)EXT2_BLOCKS_PER_GROUP(fs) + 350 fs->e2fs->e2fs_first_dblock); 351 } 352 353 /* 354 * This computes the fields of the m_ext2fs structure from the 355 * data in the ext2fs structure read in. 356 */ 357 static int 358 compute_sb_data(struct vnode *devvp, struct ext2fs *es, 359 struct m_ext2fs *fs) 360 { 361 int g_count = 0, error; 362 int i, j; 363 struct buf *bp; 364 uint32_t e2fs_descpb, e2fs_gdbcount_alloc; 365 366 fs->e2fs_bcount = es->e2fs_bcount; 367 fs->e2fs_rbcount = es->e2fs_rbcount; 368 fs->e2fs_fbcount = es->e2fs_fbcount; 369 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 370 fs->e2fs_bcount |= (uint64_t)(es->e4fs_bcount_hi) << 32; 371 fs->e2fs_rbcount |= (uint64_t)(es->e4fs_rbcount_hi) << 32; 372 fs->e2fs_fbcount |= (uint64_t)(es->e4fs_fbcount_hi) << 32; 373 } 374 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 375 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 376 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 377 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 378 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 379 if (fs->e2fs_fsize) 380 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 381 fs->e2fs_bpg = es->e2fs_bpg; 382 fs->e2fs_fpg = es->e2fs_fpg; 383 fs->e2fs_ipg = es->e2fs_ipg; 384 if (es->e2fs_rev == E2FS_REV0) { 385 fs->e2fs_isize = E2FS_REV0_INODE_SIZE; 386 } else { 387 fs->e2fs_isize = es->e2fs_inode_size; 388 389 /* 390 * Simple sanity check for superblock inode size value. 391 */ 392 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 393 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 394 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 395 printf("ext2fs: invalid inode size %d\n", 396 fs->e2fs_isize); 397 return (EIO); 398 } 399 } 400 /* Check for extra isize in big inodes. */ 401 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 402 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 403 printf("ext2fs: no space for extra inode timestamps\n"); 404 return (EINVAL); 405 } 406 /* Check checksum features */ 407 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) && 408 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 409 printf("ext2fs: incorrect checksum features combination\n"); 410 return (EINVAL); 411 } 412 /* Check for group descriptor size */ 413 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) && 414 (es->e3fs_desc_size != sizeof(struct ext2_gd))) { 415 printf("ext2fs: group descriptor size unsupported %d\n", 416 es->e3fs_desc_size); 417 return (EINVAL); 418 } 419 /* Check for block size = 1K|2K|4K */ 420 if (es->e2fs_log_bsize > 2) { 421 printf("ext2fs: bad block size: %d\n", es->e2fs_log_bsize); 422 return (EINVAL); 423 } 424 /* Check for group size */ 425 if (fs->e2fs_bpg == 0) { 426 printf("ext2fs: zero blocks per group\n"); 427 return (EINVAL); 428 } 429 if (fs->e2fs_bpg != fs->e2fs_bsize * 8) { 430 printf("ext2fs: non-standard group size unsupported %d\n", 431 fs->e2fs_bpg); 432 return (EINVAL); 433 } 434 435 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 436 if (fs->e2fs_ipg == 0) { 437 printf("ext2fs: zero inodes per group\n"); 438 return (EINVAL); 439 } 440 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 441 /* Check for block consistency */ 442 if (es->e2fs_first_dblock >= fs->e2fs_bcount) { 443 printf("ext2fs: invalid first data block\n"); 444 return (EINVAL); 445 } 446 if (fs->e2fs_rbcount > fs->e2fs_bcount || 447 fs->e2fs_fbcount > fs->e2fs_bcount) { 448 printf("ext2fs: invalid block count\n"); 449 return (EINVAL); 450 } 451 /* s_resuid / s_resgid ? */ 452 fs->e2fs_gcount = howmany(fs->e2fs_bcount - es->e2fs_first_dblock, 453 EXT2_BLOCKS_PER_GROUP(fs)); 454 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 455 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 456 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb); 457 } else { 458 e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 459 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, 460 fs->e2fs_bsize / sizeof(struct ext2_gd)); 461 } 462 fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb); 463 fs->e2fs_gd = malloc(e2fs_gdbcount_alloc * fs->e2fs_bsize, 464 M_EXT2MNT, M_WAITOK | M_ZERO); 465 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 466 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 467 468 for (i = 0; i < fs->e2fs_gdbcount; i++) { 469 error = bread(devvp, 470 fsbtodb(fs, cg_location(fs, i)), 471 fs->e2fs_bsize, NOCRED, &bp); 472 if (error) { 473 free(fs->e2fs_contigdirs, M_EXT2MNT); 474 free(fs->e2fs_gd, M_EXT2MNT); 475 brelse(bp); 476 return (error); 477 } 478 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 479 memcpy(&fs->e2fs_gd[ 480 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 481 bp->b_data, fs->e2fs_bsize); 482 } else { 483 for (j = 0; j < e2fs_descpb && 484 g_count < fs->e2fs_gcount; j++, g_count++) 485 memcpy(&fs->e2fs_gd[g_count], 486 bp->b_data + j * E2FS_REV0_GD_SIZE, 487 E2FS_REV0_GD_SIZE); 488 } 489 brelse(bp); 490 bp = NULL; 491 } 492 /* Precompute checksum seed for all metadata */ 493 ext2_sb_csum_set_seed(fs); 494 /* Verfy cg csum */ 495 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 496 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 497 error = ext2_gd_csum_verify(fs, devvp->v_rdev); 498 if (error) 499 return (error); 500 } 501 /* Initialization for the ext2 Orlov allocator variant. */ 502 fs->e2fs_total_dir = 0; 503 for (i = 0; i < fs->e2fs_gcount; i++) 504 fs->e2fs_total_dir += e2fs_gd_get_ndirs(&fs->e2fs_gd[i]); 505 506 if (es->e2fs_rev == E2FS_REV0 || 507 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 508 fs->e2fs_maxfilesize = 0x7fffffff; 509 else { 510 fs->e2fs_maxfilesize = 0xffffffffffff; 511 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 512 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 513 } 514 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) { 515 fs->e2fs_uhash = 3; 516 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) { 517 #ifdef __CHAR_UNSIGNED__ 518 es->e4fs_flags |= E2FS_UNSIGNED_HASH; 519 fs->e2fs_uhash = 3; 520 #else 521 es->e4fs_flags |= E2FS_SIGNED_HASH; 522 #endif 523 } 524 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 525 error = ext2_sb_csum_verify(fs); 526 527 return (error); 528 } 529 530 /* 531 * Reload all incore data for a filesystem (used after running fsck on 532 * the root filesystem and finding things to fix). The filesystem must 533 * be mounted read-only. 534 * 535 * Things to do to update the mount: 536 * 1) invalidate all cached meta-data. 537 * 2) re-read superblock from disk. 538 * 3) invalidate all cluster summary information. 539 * 4) invalidate all inactive vnodes. 540 * 5) invalidate all cached file data. 541 * 6) re-read inode data for all active vnodes. 542 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 543 */ 544 static int 545 ext2_reload(struct mount *mp, struct thread *td) 546 { 547 struct vnode *vp, *mvp, *devvp; 548 struct inode *ip; 549 struct buf *bp; 550 struct ext2fs *es; 551 struct m_ext2fs *fs; 552 struct csum *sump; 553 int error, i; 554 int32_t *lp; 555 556 if ((mp->mnt_flag & MNT_RDONLY) == 0) 557 return (EINVAL); 558 /* 559 * Step 1: invalidate all cached meta-data. 560 */ 561 devvp = VFSTOEXT2(mp)->um_devvp; 562 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 563 if (vinvalbuf(devvp, 0, 0, 0) != 0) 564 panic("ext2_reload: dirty1"); 565 VOP_UNLOCK(devvp, 0); 566 567 /* 568 * Step 2: re-read superblock from disk. 569 * constants have been adjusted for ext2 570 */ 571 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 572 return (error); 573 es = (struct ext2fs *)bp->b_data; 574 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 575 brelse(bp); 576 return (EIO); /* XXX needs translation */ 577 } 578 fs = VFSTOEXT2(mp)->um_e2fs; 579 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 580 581 if ((error = compute_sb_data(devvp, es, fs)) != 0) { 582 brelse(bp); 583 return (error); 584 } 585 #ifdef UNKLAR 586 if (fs->fs_sbsize < SBSIZE) 587 bp->b_flags |= B_INVAL; 588 #endif 589 brelse(bp); 590 591 /* 592 * Step 3: invalidate all cluster summary information. 593 */ 594 if (fs->e2fs_contigsumsize > 0) { 595 lp = fs->e2fs_maxcluster; 596 sump = fs->e2fs_clustersum; 597 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 598 *lp++ = fs->e2fs_contigsumsize; 599 sump->cs_init = 0; 600 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 601 } 602 } 603 604 loop: 605 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 606 /* 607 * Step 4: invalidate all cached file data. 608 */ 609 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 610 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 611 goto loop; 612 } 613 if (vinvalbuf(vp, 0, 0, 0)) 614 panic("ext2_reload: dirty2"); 615 616 /* 617 * Step 5: re-read inode data for all active vnodes. 618 */ 619 ip = VTOI(vp); 620 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 621 (int)fs->e2fs_bsize, NOCRED, &bp); 622 if (error) { 623 VOP_UNLOCK(vp, 0); 624 vrele(vp); 625 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 626 return (error); 627 } 628 ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 629 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 630 brelse(bp); 631 VOP_UNLOCK(vp, 0); 632 vrele(vp); 633 } 634 return (0); 635 } 636 637 /* 638 * Common code for mount and mountroot. 639 */ 640 static int 641 ext2_mountfs(struct vnode *devvp, struct mount *mp) 642 { 643 struct ext2mount *ump; 644 struct buf *bp; 645 struct m_ext2fs *fs; 646 struct ext2fs *es; 647 struct cdev *dev = devvp->v_rdev; 648 struct g_consumer *cp; 649 struct bufobj *bo; 650 struct csum *sump; 651 int error; 652 int ronly; 653 int i; 654 u_long size; 655 int32_t *lp; 656 int32_t e2fs_maxcontig; 657 658 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 659 /* XXX: use VOP_ACESS to check FS perms */ 660 g_topology_lock(); 661 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 662 g_topology_unlock(); 663 VOP_UNLOCK(devvp, 0); 664 if (error) 665 return (error); 666 667 /* XXX: should we check for some sectorsize or 512 instead? */ 668 if (((SBSIZE % cp->provider->sectorsize) != 0) || 669 (SBSIZE < cp->provider->sectorsize)) { 670 g_topology_lock(); 671 g_vfs_close(cp); 672 g_topology_unlock(); 673 return (EINVAL); 674 } 675 676 bo = &devvp->v_bufobj; 677 bo->bo_private = cp; 678 bo->bo_ops = g_vfs_bufops; 679 if (devvp->v_rdev->si_iosize_max != 0) 680 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 681 if (mp->mnt_iosize_max > MAXPHYS) 682 mp->mnt_iosize_max = MAXPHYS; 683 684 bp = NULL; 685 ump = NULL; 686 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 687 goto out; 688 es = (struct ext2fs *)bp->b_data; 689 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 690 error = EINVAL; /* XXX needs translation */ 691 goto out; 692 } 693 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 694 (es->e2fs_state & E2FS_ERRORS)) { 695 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 696 printf( 697 "WARNING: Filesystem was not properly dismounted\n"); 698 } else { 699 printf( 700 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 701 error = EPERM; 702 goto out; 703 } 704 } 705 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 706 707 /* 708 * I don't know whether this is the right strategy. Note that 709 * we dynamically allocate both an m_ext2fs and an ext2fs 710 * while Linux keeps the super block in a locked buffer. 711 */ 712 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 713 M_EXT2MNT, M_WAITOK | M_ZERO); 714 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 715 M_EXT2MNT, M_WAITOK); 716 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 717 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 718 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 719 goto out; 720 721 /* 722 * Calculate the maximum contiguous blocks and size of cluster summary 723 * array. In FFS this is done by newfs; however, the superblock 724 * in ext2fs doesn't have these variables, so we can calculate 725 * them here. 726 */ 727 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 728 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 729 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 730 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 731 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 732 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 733 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 734 lp = ump->um_e2fs->e2fs_maxcluster; 735 sump = ump->um_e2fs->e2fs_clustersum; 736 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 737 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 738 sump->cs_init = 0; 739 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 740 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 741 } 742 } 743 744 brelse(bp); 745 bp = NULL; 746 fs = ump->um_e2fs; 747 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 748 749 /* 750 * If the fs is not mounted read-only, make sure the super block is 751 * always written back on a sync(). 752 */ 753 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 754 if (ronly == 0) { 755 fs->e2fs_fmod = 1; /* mark it modified */ 756 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 757 } 758 mp->mnt_data = ump; 759 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 760 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 761 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 762 MNT_ILOCK(mp); 763 mp->mnt_flag |= MNT_LOCAL; 764 MNT_IUNLOCK(mp); 765 ump->um_mountp = mp; 766 ump->um_dev = dev; 767 ump->um_devvp = devvp; 768 ump->um_bo = &devvp->v_bufobj; 769 ump->um_cp = cp; 770 771 /* 772 * Setting those two parameters allowed us to use 773 * ufs_bmap w/o changse! 774 */ 775 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 776 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 777 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 778 if (ronly == 0) 779 ext2_sbupdate(ump, MNT_WAIT); 780 /* 781 * Initialize filesystem stat information in mount struct. 782 */ 783 MNT_ILOCK(mp); 784 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 785 MNTK_USES_BCACHE; 786 MNT_IUNLOCK(mp); 787 return (0); 788 out: 789 if (bp) 790 brelse(bp); 791 if (cp != NULL) { 792 g_topology_lock(); 793 g_vfs_close(cp); 794 g_topology_unlock(); 795 } 796 if (ump) { 797 mtx_destroy(EXT2_MTX(ump)); 798 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 799 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 800 free(ump->um_e2fs->e2fs, M_EXT2MNT); 801 free(ump->um_e2fs, M_EXT2MNT); 802 free(ump, M_EXT2MNT); 803 mp->mnt_data = NULL; 804 } 805 return (error); 806 } 807 808 /* 809 * Unmount system call. 810 */ 811 static int 812 ext2_unmount(struct mount *mp, int mntflags) 813 { 814 struct ext2mount *ump; 815 struct m_ext2fs *fs; 816 struct csum *sump; 817 int error, flags, i, ronly; 818 819 flags = 0; 820 if (mntflags & MNT_FORCE) { 821 if (mp->mnt_flag & MNT_ROOTFS) 822 return (EINVAL); 823 flags |= FORCECLOSE; 824 } 825 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 826 return (error); 827 ump = VFSTOEXT2(mp); 828 fs = ump->um_e2fs; 829 ronly = fs->e2fs_ronly; 830 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 831 if (fs->e2fs_wasvalid) 832 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 833 ext2_sbupdate(ump, MNT_WAIT); 834 } 835 836 g_topology_lock(); 837 g_vfs_close(ump->um_cp); 838 g_topology_unlock(); 839 vrele(ump->um_devvp); 840 sump = fs->e2fs_clustersum; 841 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 842 free(sump->cs_sum, M_EXT2MNT); 843 free(fs->e2fs_clustersum, M_EXT2MNT); 844 free(fs->e2fs_maxcluster, M_EXT2MNT); 845 free(fs->e2fs_gd, M_EXT2MNT); 846 free(fs->e2fs_contigdirs, M_EXT2MNT); 847 free(fs->e2fs, M_EXT2MNT); 848 free(fs, M_EXT2MNT); 849 free(ump, M_EXT2MNT); 850 mp->mnt_data = NULL; 851 MNT_ILOCK(mp); 852 mp->mnt_flag &= ~MNT_LOCAL; 853 MNT_IUNLOCK(mp); 854 return (error); 855 } 856 857 /* 858 * Flush out all the files in a filesystem. 859 */ 860 static int 861 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 862 { 863 int error; 864 865 error = vflush(mp, 0, flags, td); 866 return (error); 867 } 868 869 /* 870 * Get filesystem statistics. 871 */ 872 int 873 ext2_statfs(struct mount *mp, struct statfs *sbp) 874 { 875 struct ext2mount *ump; 876 struct m_ext2fs *fs; 877 uint32_t overhead, overhead_per_group, ngdb; 878 int i, ngroups; 879 880 ump = VFSTOEXT2(mp); 881 fs = ump->um_e2fs; 882 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 883 panic("ext2_statfs"); 884 885 /* 886 * Compute the overhead (FS structures) 887 */ 888 overhead_per_group = 889 1 /* block bitmap */ + 890 1 /* inode bitmap */ + 891 fs->e2fs_itpg; 892 overhead = fs->e2fs->e2fs_first_dblock + 893 fs->e2fs_gcount * overhead_per_group; 894 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 895 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 896 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 897 if (ext2_cg_has_sb(fs, i)) 898 ngroups++; 899 } 900 } else { 901 ngroups = fs->e2fs_gcount; 902 } 903 ngdb = fs->e2fs_gdbcount; 904 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 905 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 906 ngdb += fs->e2fs->e2fs_reserved_ngdb; 907 overhead += ngroups * (1 /* superblock */ + ngdb); 908 909 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 910 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 911 sbp->f_blocks = fs->e2fs_bcount - overhead; 912 sbp->f_bfree = fs->e2fs_fbcount; 913 sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount; 914 sbp->f_files = fs->e2fs->e2fs_icount; 915 sbp->f_ffree = fs->e2fs->e2fs_ficount; 916 return (0); 917 } 918 919 /* 920 * Go through the disk queues to initiate sandbagged IO; 921 * go through the inodes to write those that have been modified; 922 * initiate the writing of the super block if it has been modified. 923 * 924 * Note: we are always called with the filesystem marked `MPBUSY'. 925 */ 926 static int 927 ext2_sync(struct mount *mp, int waitfor) 928 { 929 struct vnode *mvp, *vp; 930 struct thread *td; 931 struct inode *ip; 932 struct ext2mount *ump = VFSTOEXT2(mp); 933 struct m_ext2fs *fs; 934 int error, allerror = 0; 935 936 td = curthread; 937 fs = ump->um_e2fs; 938 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 939 printf("fs = %s\n", fs->e2fs_fsmnt); 940 panic("ext2_sync: rofs mod"); 941 } 942 943 /* 944 * Write back each (modified) inode. 945 */ 946 loop: 947 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 948 if (vp->v_type == VNON) { 949 VI_UNLOCK(vp); 950 continue; 951 } 952 ip = VTOI(vp); 953 if ((ip->i_flag & 954 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 955 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 956 waitfor == MNT_LAZY)) { 957 VI_UNLOCK(vp); 958 continue; 959 } 960 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 961 if (error) { 962 if (error == ENOENT) { 963 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 964 goto loop; 965 } 966 continue; 967 } 968 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 969 allerror = error; 970 VOP_UNLOCK(vp, 0); 971 vrele(vp); 972 } 973 974 /* 975 * Force stale filesystem control information to be flushed. 976 */ 977 if (waitfor != MNT_LAZY) { 978 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 979 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 980 allerror = error; 981 VOP_UNLOCK(ump->um_devvp, 0); 982 } 983 984 /* 985 * Write back modified superblock. 986 */ 987 if (fs->e2fs_fmod != 0) { 988 fs->e2fs_fmod = 0; 989 fs->e2fs->e2fs_wtime = time_second; 990 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 991 allerror = error; 992 } 993 return (allerror); 994 } 995 996 /* 997 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 998 * in from disk. If it is in core, wait for the lock bit to clear, then 999 * return the inode locked. Detection and handling of mount points must be 1000 * done by the calling routine. 1001 */ 1002 static int 1003 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 1004 { 1005 struct m_ext2fs *fs; 1006 struct inode *ip; 1007 struct ext2mount *ump; 1008 struct buf *bp; 1009 struct vnode *vp; 1010 struct thread *td; 1011 int i, error; 1012 int used_blocks; 1013 1014 td = curthread; 1015 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 1016 if (error || *vpp != NULL) 1017 return (error); 1018 1019 ump = VFSTOEXT2(mp); 1020 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 1021 1022 /* Allocate a new vnode/inode. */ 1023 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 1024 *vpp = NULL; 1025 free(ip, M_EXT2NODE); 1026 return (error); 1027 } 1028 vp->v_data = ip; 1029 ip->i_vnode = vp; 1030 ip->i_e2fs = fs = ump->um_e2fs; 1031 ip->i_ump = ump; 1032 ip->i_number = ino; 1033 1034 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 1035 error = insmntque(vp, mp); 1036 if (error != 0) { 1037 free(ip, M_EXT2NODE); 1038 *vpp = NULL; 1039 return (error); 1040 } 1041 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 1042 if (error || *vpp != NULL) 1043 return (error); 1044 1045 /* Read in the disk contents for the inode, copy into the inode. */ 1046 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 1047 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 1048 /* 1049 * The inode does not contain anything useful, so it would 1050 * be misleading to leave it on its hash chain. With mode 1051 * still zero, it will be unlinked and returned to the free 1052 * list by vput(). 1053 */ 1054 brelse(bp); 1055 vput(vp); 1056 *vpp = NULL; 1057 return (error); 1058 } 1059 /* convert ext2 inode to dinode */ 1060 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 1061 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ino)), ip); 1062 if (error) { 1063 printf("ext2fs: Bad inode %lu csum - run fsck\n", 1064 (unsigned long)ino); 1065 brelse(bp); 1066 vput(vp); 1067 *vpp = NULL; 1068 return (error); 1069 } 1070 ip->i_block_group = ino_to_cg(fs, ino); 1071 ip->i_next_alloc_block = 0; 1072 ip->i_next_alloc_goal = 0; 1073 1074 /* 1075 * Now we want to make sure that block pointers for unused 1076 * blocks are zeroed out - ext2_balloc depends on this 1077 * although for regular files and directories only 1078 * 1079 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 1080 * out because we could corrupt the extent tree. 1081 */ 1082 if (!(ip->i_flag & IN_E4EXTENTS) && 1083 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 1084 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 1085 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 1086 ip->i_db[i] = 0; 1087 } 1088 #ifdef EXT2FS_DEBUG 1089 ext2_print_inode(ip); 1090 ext4_ext_print_extent_tree_status(ip); 1091 #endif 1092 bqrelse(bp); 1093 1094 /* 1095 * Initialize the vnode from the inode, check for aliases. 1096 * Note that the underlying vnode may have changed. 1097 */ 1098 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 1099 vput(vp); 1100 *vpp = NULL; 1101 return (error); 1102 } 1103 1104 /* 1105 * Finish inode initialization. 1106 */ 1107 1108 *vpp = vp; 1109 return (0); 1110 } 1111 1112 /* 1113 * File handle to vnode 1114 * 1115 * Have to be really careful about stale file handles: 1116 * - check that the inode number is valid 1117 * - call ext2_vget() to get the locked inode 1118 * - check for an unallocated inode (i_mode == 0) 1119 * - check that the given client host has export rights and return 1120 * those rights via. exflagsp and credanonp 1121 */ 1122 static int 1123 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1124 { 1125 struct inode *ip; 1126 struct ufid *ufhp; 1127 struct vnode *nvp; 1128 struct m_ext2fs *fs; 1129 int error; 1130 1131 ufhp = (struct ufid *)fhp; 1132 fs = VFSTOEXT2(mp)->um_e2fs; 1133 if (ufhp->ufid_ino < EXT2_ROOTINO || 1134 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1135 return (ESTALE); 1136 1137 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1138 if (error) { 1139 *vpp = NULLVP; 1140 return (error); 1141 } 1142 ip = VTOI(nvp); 1143 if (ip->i_mode == 0 || 1144 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1145 vput(nvp); 1146 *vpp = NULLVP; 1147 return (ESTALE); 1148 } 1149 *vpp = nvp; 1150 vnode_create_vobject(*vpp, 0, curthread); 1151 return (0); 1152 } 1153 1154 /* 1155 * Write a superblock and associated information back to disk. 1156 */ 1157 static int 1158 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1159 { 1160 struct m_ext2fs *fs = mp->um_e2fs; 1161 struct ext2fs *es = fs->e2fs; 1162 struct buf *bp; 1163 int error = 0; 1164 1165 es->e2fs_bcount = fs->e2fs_bcount & 0xffffffff; 1166 es->e2fs_rbcount = fs->e2fs_rbcount & 0xffffffff; 1167 es->e2fs_fbcount = fs->e2fs_fbcount & 0xffffffff; 1168 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1169 es->e4fs_bcount_hi = fs->e2fs_bcount >> 32; 1170 es->e4fs_rbcount_hi = fs->e2fs_rbcount >> 32; 1171 es->e4fs_fbcount_hi = fs->e2fs_fbcount >> 32; 1172 } 1173 1174 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1175 ext2_sb_csum_set(fs); 1176 1177 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1178 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1179 if (waitfor == MNT_WAIT) 1180 error = bwrite(bp); 1181 else 1182 bawrite(bp); 1183 1184 /* 1185 * The buffers for group descriptors, inode bitmaps and block bitmaps 1186 * are not busy at this point and are (hopefully) written by the 1187 * usual sync mechanism. No need to write them here. 1188 */ 1189 return (error); 1190 } 1191 int 1192 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1193 { 1194 struct m_ext2fs *fs = mp->um_e2fs; 1195 struct buf *bp; 1196 int i, j, g_count = 0, error = 0, allerror = 0; 1197 1198 allerror = ext2_sbupdate(mp, waitfor); 1199 1200 /* Update gd csums */ 1201 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 1202 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1203 ext2_gd_csum_set(fs); 1204 1205 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1206 bp = getblk(mp->um_devvp, fsbtodb(fs, 1207 cg_location(fs, i)), 1208 fs->e2fs_bsize, 0, 0, 0); 1209 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1210 memcpy(bp->b_data, &fs->e2fs_gd[ 1211 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1212 fs->e2fs_bsize); 1213 } else { 1214 for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE && 1215 g_count < fs->e2fs_gcount; j++, g_count++) 1216 memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE, 1217 &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE); 1218 } 1219 if (waitfor == MNT_WAIT) 1220 error = bwrite(bp); 1221 else 1222 bawrite(bp); 1223 } 1224 1225 if (!allerror && error) 1226 allerror = error; 1227 return (allerror); 1228 } 1229 1230 /* 1231 * Return the root of a filesystem. 1232 */ 1233 static int 1234 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1235 { 1236 struct vnode *nvp; 1237 int error; 1238 1239 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1240 if (error) 1241 return (error); 1242 *vpp = nvp; 1243 return (0); 1244 } 1245