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sys/fs/ext2fs/ext2_vfsops.c
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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: releng/12.0/sys/fs/ext2fs/ext2_vfsops.c 333584 2018-05-13 19:19:10Z fsu $ 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 group size */ 420 if (fs->e2fs_bpg != fs->e2fs_bsize * 8) { 421 printf("ext2fs: non-standard group size unsupported %d\n", 422 fs->e2fs_bpg); 423 return (EINVAL); 424 } 425 426 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 427 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 428 /* s_resuid / s_resgid ? */ 429 fs->e2fs_gcount = howmany(fs->e2fs_bcount - es->e2fs_first_dblock, 430 EXT2_BLOCKS_PER_GROUP(fs)); 431 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 432 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 433 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb); 434 } else { 435 e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 436 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, 437 fs->e2fs_bsize / sizeof(struct ext2_gd)); 438 } 439 fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb); 440 fs->e2fs_gd = malloc(e2fs_gdbcount_alloc * fs->e2fs_bsize, 441 M_EXT2MNT, M_WAITOK | M_ZERO); 442 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 443 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 444 445 for (i = 0; i < fs->e2fs_gdbcount; i++) { 446 error = bread(devvp, 447 fsbtodb(fs, cg_location(fs, i)), 448 fs->e2fs_bsize, NOCRED, &bp); 449 if (error) { 450 free(fs->e2fs_contigdirs, M_EXT2MNT); 451 free(fs->e2fs_gd, M_EXT2MNT); 452 brelse(bp); 453 return (error); 454 } 455 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 456 memcpy(&fs->e2fs_gd[ 457 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 458 bp->b_data, fs->e2fs_bsize); 459 } else { 460 for (j = 0; j < e2fs_descpb && 461 g_count < fs->e2fs_gcount; j++, g_count++) 462 memcpy(&fs->e2fs_gd[g_count], 463 bp->b_data + j * E2FS_REV0_GD_SIZE, 464 E2FS_REV0_GD_SIZE); 465 } 466 brelse(bp); 467 bp = NULL; 468 } 469 /* Precompute checksum seed for all metadata */ 470 ext2_sb_csum_set_seed(fs); 471 /* Verfy cg csum */ 472 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 473 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 474 error = ext2_gd_csum_verify(fs, devvp->v_rdev); 475 if (error) 476 return (error); 477 } 478 /* Initialization for the ext2 Orlov allocator variant. */ 479 fs->e2fs_total_dir = 0; 480 for (i = 0; i < fs->e2fs_gcount; i++) 481 fs->e2fs_total_dir += e2fs_gd_get_ndirs(&fs->e2fs_gd[i]); 482 483 if (es->e2fs_rev == E2FS_REV0 || 484 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 485 fs->e2fs_maxfilesize = 0x7fffffff; 486 else { 487 fs->e2fs_maxfilesize = 0xffffffffffff; 488 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 489 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 490 } 491 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) { 492 fs->e2fs_uhash = 3; 493 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) { 494 #ifdef __CHAR_UNSIGNED__ 495 es->e4fs_flags |= E2FS_UNSIGNED_HASH; 496 fs->e2fs_uhash = 3; 497 #else 498 es->e4fs_flags |= E2FS_SIGNED_HASH; 499 #endif 500 } 501 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 502 error = ext2_sb_csum_verify(fs); 503 504 return (error); 505 } 506 507 /* 508 * Reload all incore data for a filesystem (used after running fsck on 509 * the root filesystem and finding things to fix). The filesystem must 510 * be mounted read-only. 511 * 512 * Things to do to update the mount: 513 * 1) invalidate all cached meta-data. 514 * 2) re-read superblock from disk. 515 * 3) invalidate all cluster summary information. 516 * 4) invalidate all inactive vnodes. 517 * 5) invalidate all cached file data. 518 * 6) re-read inode data for all active vnodes. 519 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 520 */ 521 static int 522 ext2_reload(struct mount *mp, struct thread *td) 523 { 524 struct vnode *vp, *mvp, *devvp; 525 struct inode *ip; 526 struct buf *bp; 527 struct ext2fs *es; 528 struct m_ext2fs *fs; 529 struct csum *sump; 530 int error, i; 531 int32_t *lp; 532 533 if ((mp->mnt_flag & MNT_RDONLY) == 0) 534 return (EINVAL); 535 /* 536 * Step 1: invalidate all cached meta-data. 537 */ 538 devvp = VFSTOEXT2(mp)->um_devvp; 539 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 540 if (vinvalbuf(devvp, 0, 0, 0) != 0) 541 panic("ext2_reload: dirty1"); 542 VOP_UNLOCK(devvp, 0); 543 544 /* 545 * Step 2: re-read superblock from disk. 546 * constants have been adjusted for ext2 547 */ 548 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 549 return (error); 550 es = (struct ext2fs *)bp->b_data; 551 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 552 brelse(bp); 553 return (EIO); /* XXX needs translation */ 554 } 555 fs = VFSTOEXT2(mp)->um_e2fs; 556 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 557 558 if ((error = compute_sb_data(devvp, es, fs)) != 0) { 559 brelse(bp); 560 return (error); 561 } 562 #ifdef UNKLAR 563 if (fs->fs_sbsize < SBSIZE) 564 bp->b_flags |= B_INVAL; 565 #endif 566 brelse(bp); 567 568 /* 569 * Step 3: invalidate all cluster summary information. 570 */ 571 if (fs->e2fs_contigsumsize > 0) { 572 lp = fs->e2fs_maxcluster; 573 sump = fs->e2fs_clustersum; 574 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 575 *lp++ = fs->e2fs_contigsumsize; 576 sump->cs_init = 0; 577 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 578 } 579 } 580 581 loop: 582 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 583 /* 584 * Step 4: invalidate all cached file data. 585 */ 586 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 587 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 588 goto loop; 589 } 590 if (vinvalbuf(vp, 0, 0, 0)) 591 panic("ext2_reload: dirty2"); 592 593 /* 594 * Step 5: re-read inode data for all active vnodes. 595 */ 596 ip = VTOI(vp); 597 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 598 (int)fs->e2fs_bsize, NOCRED, &bp); 599 if (error) { 600 VOP_UNLOCK(vp, 0); 601 vrele(vp); 602 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 603 return (error); 604 } 605 ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 606 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 607 brelse(bp); 608 VOP_UNLOCK(vp, 0); 609 vrele(vp); 610 } 611 return (0); 612 } 613 614 /* 615 * Common code for mount and mountroot. 616 */ 617 static int 618 ext2_mountfs(struct vnode *devvp, struct mount *mp) 619 { 620 struct ext2mount *ump; 621 struct buf *bp; 622 struct m_ext2fs *fs; 623 struct ext2fs *es; 624 struct cdev *dev = devvp->v_rdev; 625 struct g_consumer *cp; 626 struct bufobj *bo; 627 struct csum *sump; 628 int error; 629 int ronly; 630 int i; 631 u_long size; 632 int32_t *lp; 633 int32_t e2fs_maxcontig; 634 635 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 636 /* XXX: use VOP_ACESS to check FS perms */ 637 g_topology_lock(); 638 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 639 g_topology_unlock(); 640 VOP_UNLOCK(devvp, 0); 641 if (error) 642 return (error); 643 644 /* XXX: should we check for some sectorsize or 512 instead? */ 645 if (((SBSIZE % cp->provider->sectorsize) != 0) || 646 (SBSIZE < cp->provider->sectorsize)) { 647 g_topology_lock(); 648 g_vfs_close(cp); 649 g_topology_unlock(); 650 return (EINVAL); 651 } 652 653 bo = &devvp->v_bufobj; 654 bo->bo_private = cp; 655 bo->bo_ops = g_vfs_bufops; 656 if (devvp->v_rdev->si_iosize_max != 0) 657 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 658 if (mp->mnt_iosize_max > MAXPHYS) 659 mp->mnt_iosize_max = MAXPHYS; 660 661 bp = NULL; 662 ump = NULL; 663 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 664 goto out; 665 es = (struct ext2fs *)bp->b_data; 666 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 667 error = EINVAL; /* XXX needs translation */ 668 goto out; 669 } 670 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 671 (es->e2fs_state & E2FS_ERRORS)) { 672 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 673 printf( 674 "WARNING: Filesystem was not properly dismounted\n"); 675 } else { 676 printf( 677 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 678 error = EPERM; 679 goto out; 680 } 681 } 682 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 683 684 /* 685 * I don't know whether this is the right strategy. Note that 686 * we dynamically allocate both an m_ext2fs and an ext2fs 687 * while Linux keeps the super block in a locked buffer. 688 */ 689 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 690 M_EXT2MNT, M_WAITOK | M_ZERO); 691 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 692 M_EXT2MNT, M_WAITOK); 693 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 694 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 695 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 696 goto out; 697 698 /* 699 * Calculate the maximum contiguous blocks and size of cluster summary 700 * array. In FFS this is done by newfs; however, the superblock 701 * in ext2fs doesn't have these variables, so we can calculate 702 * them here. 703 */ 704 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 705 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 706 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 707 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 708 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 709 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 710 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 711 lp = ump->um_e2fs->e2fs_maxcluster; 712 sump = ump->um_e2fs->e2fs_clustersum; 713 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 714 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 715 sump->cs_init = 0; 716 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 717 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 718 } 719 } 720 721 brelse(bp); 722 bp = NULL; 723 fs = ump->um_e2fs; 724 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 725 726 /* 727 * If the fs is not mounted read-only, make sure the super block is 728 * always written back on a sync(). 729 */ 730 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 731 if (ronly == 0) { 732 fs->e2fs_fmod = 1; /* mark it modified */ 733 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 734 } 735 mp->mnt_data = ump; 736 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 737 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 738 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 739 MNT_ILOCK(mp); 740 mp->mnt_flag |= MNT_LOCAL; 741 MNT_IUNLOCK(mp); 742 ump->um_mountp = mp; 743 ump->um_dev = dev; 744 ump->um_devvp = devvp; 745 ump->um_bo = &devvp->v_bufobj; 746 ump->um_cp = cp; 747 748 /* 749 * Setting those two parameters allowed us to use 750 * ufs_bmap w/o changse! 751 */ 752 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 753 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 754 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 755 if (ronly == 0) 756 ext2_sbupdate(ump, MNT_WAIT); 757 /* 758 * Initialize filesystem stat information in mount struct. 759 */ 760 MNT_ILOCK(mp); 761 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 762 MNTK_USES_BCACHE; 763 MNT_IUNLOCK(mp); 764 return (0); 765 out: 766 if (bp) 767 brelse(bp); 768 if (cp != NULL) { 769 g_topology_lock(); 770 g_vfs_close(cp); 771 g_topology_unlock(); 772 } 773 if (ump) { 774 mtx_destroy(EXT2_MTX(ump)); 775 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 776 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 777 free(ump->um_e2fs->e2fs, M_EXT2MNT); 778 free(ump->um_e2fs, M_EXT2MNT); 779 free(ump, M_EXT2MNT); 780 mp->mnt_data = NULL; 781 } 782 return (error); 783 } 784 785 /* 786 * Unmount system call. 787 */ 788 static int 789 ext2_unmount(struct mount *mp, int mntflags) 790 { 791 struct ext2mount *ump; 792 struct m_ext2fs *fs; 793 struct csum *sump; 794 int error, flags, i, ronly; 795 796 flags = 0; 797 if (mntflags & MNT_FORCE) { 798 if (mp->mnt_flag & MNT_ROOTFS) 799 return (EINVAL); 800 flags |= FORCECLOSE; 801 } 802 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 803 return (error); 804 ump = VFSTOEXT2(mp); 805 fs = ump->um_e2fs; 806 ronly = fs->e2fs_ronly; 807 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 808 if (fs->e2fs_wasvalid) 809 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 810 ext2_sbupdate(ump, MNT_WAIT); 811 } 812 813 g_topology_lock(); 814 g_vfs_close(ump->um_cp); 815 g_topology_unlock(); 816 vrele(ump->um_devvp); 817 sump = fs->e2fs_clustersum; 818 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 819 free(sump->cs_sum, M_EXT2MNT); 820 free(fs->e2fs_clustersum, M_EXT2MNT); 821 free(fs->e2fs_maxcluster, M_EXT2MNT); 822 free(fs->e2fs_gd, M_EXT2MNT); 823 free(fs->e2fs_contigdirs, M_EXT2MNT); 824 free(fs->e2fs, M_EXT2MNT); 825 free(fs, M_EXT2MNT); 826 free(ump, M_EXT2MNT); 827 mp->mnt_data = NULL; 828 MNT_ILOCK(mp); 829 mp->mnt_flag &= ~MNT_LOCAL; 830 MNT_IUNLOCK(mp); 831 return (error); 832 } 833 834 /* 835 * Flush out all the files in a filesystem. 836 */ 837 static int 838 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 839 { 840 int error; 841 842 error = vflush(mp, 0, flags, td); 843 return (error); 844 } 845 846 /* 847 * Get filesystem statistics. 848 */ 849 int 850 ext2_statfs(struct mount *mp, struct statfs *sbp) 851 { 852 struct ext2mount *ump; 853 struct m_ext2fs *fs; 854 uint32_t overhead, overhead_per_group, ngdb; 855 int i, ngroups; 856 857 ump = VFSTOEXT2(mp); 858 fs = ump->um_e2fs; 859 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 860 panic("ext2_statfs"); 861 862 /* 863 * Compute the overhead (FS structures) 864 */ 865 overhead_per_group = 866 1 /* block bitmap */ + 867 1 /* inode bitmap */ + 868 fs->e2fs_itpg; 869 overhead = fs->e2fs->e2fs_first_dblock + 870 fs->e2fs_gcount * overhead_per_group; 871 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 872 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 873 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 874 if (ext2_cg_has_sb(fs, i)) 875 ngroups++; 876 } 877 } else { 878 ngroups = fs->e2fs_gcount; 879 } 880 ngdb = fs->e2fs_gdbcount; 881 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 882 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 883 ngdb += fs->e2fs->e2fs_reserved_ngdb; 884 overhead += ngroups * (1 /* superblock */ + ngdb); 885 886 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 887 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 888 sbp->f_blocks = fs->e2fs_bcount - overhead; 889 sbp->f_bfree = fs->e2fs_fbcount; 890 sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount; 891 sbp->f_files = fs->e2fs->e2fs_icount; 892 sbp->f_ffree = fs->e2fs->e2fs_ficount; 893 return (0); 894 } 895 896 /* 897 * Go through the disk queues to initiate sandbagged IO; 898 * go through the inodes to write those that have been modified; 899 * initiate the writing of the super block if it has been modified. 900 * 901 * Note: we are always called with the filesystem marked `MPBUSY'. 902 */ 903 static int 904 ext2_sync(struct mount *mp, int waitfor) 905 { 906 struct vnode *mvp, *vp; 907 struct thread *td; 908 struct inode *ip; 909 struct ext2mount *ump = VFSTOEXT2(mp); 910 struct m_ext2fs *fs; 911 int error, allerror = 0; 912 913 td = curthread; 914 fs = ump->um_e2fs; 915 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 916 printf("fs = %s\n", fs->e2fs_fsmnt); 917 panic("ext2_sync: rofs mod"); 918 } 919 920 /* 921 * Write back each (modified) inode. 922 */ 923 loop: 924 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 925 if (vp->v_type == VNON) { 926 VI_UNLOCK(vp); 927 continue; 928 } 929 ip = VTOI(vp); 930 if ((ip->i_flag & 931 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 932 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 933 waitfor == MNT_LAZY)) { 934 VI_UNLOCK(vp); 935 continue; 936 } 937 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 938 if (error) { 939 if (error == ENOENT) { 940 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 941 goto loop; 942 } 943 continue; 944 } 945 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 946 allerror = error; 947 VOP_UNLOCK(vp, 0); 948 vrele(vp); 949 } 950 951 /* 952 * Force stale filesystem control information to be flushed. 953 */ 954 if (waitfor != MNT_LAZY) { 955 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 956 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 957 allerror = error; 958 VOP_UNLOCK(ump->um_devvp, 0); 959 } 960 961 /* 962 * Write back modified superblock. 963 */ 964 if (fs->e2fs_fmod != 0) { 965 fs->e2fs_fmod = 0; 966 fs->e2fs->e2fs_wtime = time_second; 967 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 968 allerror = error; 969 } 970 return (allerror); 971 } 972 973 /* 974 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 975 * in from disk. If it is in core, wait for the lock bit to clear, then 976 * return the inode locked. Detection and handling of mount points must be 977 * done by the calling routine. 978 */ 979 static int 980 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 981 { 982 struct m_ext2fs *fs; 983 struct inode *ip; 984 struct ext2mount *ump; 985 struct buf *bp; 986 struct vnode *vp; 987 struct thread *td; 988 int i, error; 989 int used_blocks; 990 991 td = curthread; 992 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 993 if (error || *vpp != NULL) 994 return (error); 995 996 ump = VFSTOEXT2(mp); 997 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 998 999 /* Allocate a new vnode/inode. */ 1000 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 1001 *vpp = NULL; 1002 free(ip, M_EXT2NODE); 1003 return (error); 1004 } 1005 vp->v_data = ip; 1006 ip->i_vnode = vp; 1007 ip->i_e2fs = fs = ump->um_e2fs; 1008 ip->i_ump = ump; 1009 ip->i_number = ino; 1010 1011 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 1012 error = insmntque(vp, mp); 1013 if (error != 0) { 1014 free(ip, M_EXT2NODE); 1015 *vpp = NULL; 1016 return (error); 1017 } 1018 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 1019 if (error || *vpp != NULL) 1020 return (error); 1021 1022 /* Read in the disk contents for the inode, copy into the inode. */ 1023 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 1024 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 1025 /* 1026 * The inode does not contain anything useful, so it would 1027 * be misleading to leave it on its hash chain. With mode 1028 * still zero, it will be unlinked and returned to the free 1029 * list by vput(). 1030 */ 1031 brelse(bp); 1032 vput(vp); 1033 *vpp = NULL; 1034 return (error); 1035 } 1036 /* convert ext2 inode to dinode */ 1037 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 1038 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ino)), ip); 1039 if (error) { 1040 printf("ext2fs: Bad inode %lu csum - run fsck\n", 1041 (unsigned long)ino); 1042 brelse(bp); 1043 vput(vp); 1044 *vpp = NULL; 1045 return (error); 1046 } 1047 ip->i_block_group = ino_to_cg(fs, ino); 1048 ip->i_next_alloc_block = 0; 1049 ip->i_next_alloc_goal = 0; 1050 1051 /* 1052 * Now we want to make sure that block pointers for unused 1053 * blocks are zeroed out - ext2_balloc depends on this 1054 * although for regular files and directories only 1055 * 1056 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 1057 * out because we could corrupt the extent tree. 1058 */ 1059 if (!(ip->i_flag & IN_E4EXTENTS) && 1060 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 1061 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 1062 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 1063 ip->i_db[i] = 0; 1064 } 1065 #ifdef EXT2FS_DEBUG 1066 ext2_print_inode(ip); 1067 ext4_ext_print_extent_tree_status(ip); 1068 #endif 1069 bqrelse(bp); 1070 1071 /* 1072 * Initialize the vnode from the inode, check for aliases. 1073 * Note that the underlying vnode may have changed. 1074 */ 1075 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 1076 vput(vp); 1077 *vpp = NULL; 1078 return (error); 1079 } 1080 1081 /* 1082 * Finish inode initialization. 1083 */ 1084 1085 *vpp = vp; 1086 return (0); 1087 } 1088 1089 /* 1090 * File handle to vnode 1091 * 1092 * Have to be really careful about stale file handles: 1093 * - check that the inode number is valid 1094 * - call ext2_vget() to get the locked inode 1095 * - check for an unallocated inode (i_mode == 0) 1096 * - check that the given client host has export rights and return 1097 * those rights via. exflagsp and credanonp 1098 */ 1099 static int 1100 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1101 { 1102 struct inode *ip; 1103 struct ufid *ufhp; 1104 struct vnode *nvp; 1105 struct m_ext2fs *fs; 1106 int error; 1107 1108 ufhp = (struct ufid *)fhp; 1109 fs = VFSTOEXT2(mp)->um_e2fs; 1110 if (ufhp->ufid_ino < EXT2_ROOTINO || 1111 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1112 return (ESTALE); 1113 1114 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1115 if (error) { 1116 *vpp = NULLVP; 1117 return (error); 1118 } 1119 ip = VTOI(nvp); 1120 if (ip->i_mode == 0 || 1121 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1122 vput(nvp); 1123 *vpp = NULLVP; 1124 return (ESTALE); 1125 } 1126 *vpp = nvp; 1127 vnode_create_vobject(*vpp, 0, curthread); 1128 return (0); 1129 } 1130 1131 /* 1132 * Write a superblock and associated information back to disk. 1133 */ 1134 static int 1135 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1136 { 1137 struct m_ext2fs *fs = mp->um_e2fs; 1138 struct ext2fs *es = fs->e2fs; 1139 struct buf *bp; 1140 int error = 0; 1141 1142 es->e2fs_bcount = fs->e2fs_bcount & 0xffffffff; 1143 es->e2fs_rbcount = fs->e2fs_rbcount & 0xffffffff; 1144 es->e2fs_fbcount = fs->e2fs_fbcount & 0xffffffff; 1145 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1146 es->e4fs_bcount_hi = fs->e2fs_bcount >> 32; 1147 es->e4fs_rbcount_hi = fs->e2fs_rbcount >> 32; 1148 es->e4fs_fbcount_hi = fs->e2fs_fbcount >> 32; 1149 } 1150 1151 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1152 ext2_sb_csum_set(fs); 1153 1154 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1155 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1156 if (waitfor == MNT_WAIT) 1157 error = bwrite(bp); 1158 else 1159 bawrite(bp); 1160 1161 /* 1162 * The buffers for group descriptors, inode bitmaps and block bitmaps 1163 * are not busy at this point and are (hopefully) written by the 1164 * usual sync mechanism. No need to write them here. 1165 */ 1166 return (error); 1167 } 1168 int 1169 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1170 { 1171 struct m_ext2fs *fs = mp->um_e2fs; 1172 struct buf *bp; 1173 int i, j, g_count = 0, error = 0, allerror = 0; 1174 1175 allerror = ext2_sbupdate(mp, waitfor); 1176 1177 /* Update gd csums */ 1178 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 1179 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1180 ext2_gd_csum_set(fs); 1181 1182 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1183 bp = getblk(mp->um_devvp, fsbtodb(fs, 1184 cg_location(fs, i)), 1185 fs->e2fs_bsize, 0, 0, 0); 1186 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1187 memcpy(bp->b_data, &fs->e2fs_gd[ 1188 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1189 fs->e2fs_bsize); 1190 } else { 1191 for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE && 1192 g_count < fs->e2fs_gcount; j++, g_count++) 1193 memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE, 1194 &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE); 1195 } 1196 if (waitfor == MNT_WAIT) 1197 error = bwrite(bp); 1198 else 1199 bawrite(bp); 1200 } 1201 1202 if (!allerror && error) 1203 allerror = error; 1204 return (allerror); 1205 } 1206 1207 /* 1208 * Return the root of a filesystem. 1209 */ 1210 static int 1211 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1212 { 1213 struct vnode *nvp; 1214 int error; 1215 1216 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1217 if (error) 1218 return (error); 1219 *vpp = nvp; 1220 return (0); 1221 }
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