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 ext2_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 ext2_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 static int 354 ext2_cg_validate(struct m_ext2fs *fs) 355 { 356 uint64_t b_bitmap; 357 uint64_t i_bitmap; 358 uint64_t i_tables; 359 uint64_t first_block, last_block, last_cg_block; 360 struct ext2_gd *gd; 361 unsigned int i, cg_count; 362 363 first_block = fs->e2fs->e2fs_first_dblock; 364 last_cg_block = ext2_cg_number_gdb(fs, 0); 365 cg_count = fs->e2fs_gcount; 366 367 for (i = 0; i < fs->e2fs_gcount; i++) { 368 gd = &fs->e2fs_gd[i]; 369 370 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG) || 371 i == fs->e2fs_gcount - 1) { 372 last_block = fs->e2fs_bcount - 1; 373 } else { 374 last_block = first_block + 375 (EXT2_BLOCKS_PER_GROUP(fs) - 1); 376 } 377 378 if ((cg_count == fs->e2fs_gcount) && 379 !(gd->ext4bgd_flags & EXT2_BG_INODE_ZEROED)) 380 cg_count = i; 381 382 b_bitmap = e2fs_gd_get_b_bitmap(gd); 383 if (b_bitmap == 0) { 384 printf("ext2fs: cg %u: block bitmap is zero\n", i); 385 return (EINVAL); 386 387 } 388 if (b_bitmap <= last_cg_block) { 389 printf("ext2fs: cg %u: block bitmap overlaps gds\n", i); 390 return (EINVAL); 391 } 392 if (b_bitmap < first_block || b_bitmap > last_block) { 393 printf("ext2fs: cg %u: block bitmap not in group, blk=%ju\n", 394 i, b_bitmap); 395 return (EINVAL); 396 } 397 398 i_bitmap = e2fs_gd_get_i_bitmap(gd); 399 if (i_bitmap == 0) { 400 printf("ext2fs: cg %u: inode bitmap is zero\n", i); 401 return (EINVAL); 402 } 403 if (i_bitmap <= last_cg_block) { 404 printf("ext2fs: cg %u: inode bitmap overlaps gds\n", i); 405 return (EINVAL); 406 } 407 if (i_bitmap < first_block || i_bitmap > last_block) { 408 printf("ext2fs: cg %u: inode bitmap not in group blk=%ju\n", 409 i, i_bitmap); 410 return (EINVAL); 411 } 412 413 i_tables = e2fs_gd_get_i_tables(gd); 414 if (i_tables == 0) { 415 printf("ext2fs: cg %u: inode table is zero\n", i); 416 return (EINVAL); 417 } 418 if (i_tables <= last_cg_block) { 419 printf("ext2fs: cg %u: inode talbes overlaps gds\n", i); 420 return (EINVAL); 421 } 422 if (i_tables < first_block || 423 i_tables + fs->e2fs_itpg - 1 > last_block) { 424 printf("ext2fs: cg %u: inode tables not in group blk=%ju\n", 425 i, i_tables); 426 return (EINVAL); 427 } 428 429 if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG)) 430 first_block += EXT2_BLOCKS_PER_GROUP(fs); 431 } 432 433 return (0); 434 } 435 436 /* 437 * This computes the fields of the m_ext2fs structure from the 438 * data in the ext2fs structure read in. 439 */ 440 static int 441 ext2_compute_sb_data(struct vnode *devvp, struct ext2fs *es, 442 struct m_ext2fs *fs) 443 { 444 struct buf *bp; 445 uint32_t e2fs_descpb, e2fs_gdbcount_alloc; 446 int i, j; 447 int g_count = 0; 448 int error; 449 450 /* Check checksum features */ 451 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) && 452 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 453 printf("ext2fs: incorrect checksum features combination\n"); 454 return (EINVAL); 455 } 456 457 /* Precompute checksum seed for all metadata */ 458 ext2_sb_csum_set_seed(fs); 459 460 /* Verify sb csum if possible */ 461 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 462 error = ext2_sb_csum_verify(fs); 463 if (error) { 464 return (error); 465 } 466 } 467 468 /* Check for block size = 1K|2K|4K */ 469 if (es->e2fs_log_bsize > 2) { 470 printf("ext2fs: bad block size: %d\n", es->e2fs_log_bsize); 471 return (EINVAL); 472 } 473 474 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 475 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 476 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 477 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 478 479 /* Check for fragment size */ 480 if (es->e2fs_log_fsize > 481 (EXT2_MAX_FRAG_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE)) { 482 printf("ext2fs: invalid log cluster size: %u\n", 483 es->e2fs_log_fsize); 484 return (EINVAL); 485 } 486 487 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 488 if (fs->e2fs_fsize != fs->e2fs_bsize) { 489 printf("ext2fs: fragment size (%u) != block size %u\n", 490 fs->e2fs_fsize, fs->e2fs_bsize); 491 return (EINVAL); 492 } 493 494 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 495 496 /* Check reserved gdt blocks for future filesystem expansion */ 497 if (es->e2fs_reserved_ngdb > (fs->e2fs_bsize / 4)) { 498 printf("ext2fs: number of reserved GDT blocks too large: %u\n", 499 es->e2fs_reserved_ngdb); 500 return (EINVAL); 501 } 502 503 if (es->e2fs_rev == E2FS_REV0) { 504 fs->e2fs_isize = E2FS_REV0_INODE_SIZE; 505 } else { 506 fs->e2fs_isize = es->e2fs_inode_size; 507 508 /* 509 * Check first ino. 510 */ 511 if (es->e2fs_first_ino < EXT2_FIRSTINO) { 512 printf("ext2fs: invalid first ino: %u\n", 513 es->e2fs_first_ino); 514 return (EINVAL); 515 } 516 517 /* 518 * Simple sanity check for superblock inode size value. 519 */ 520 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 521 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 522 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 523 printf("ext2fs: invalid inode size %u\n", 524 fs->e2fs_isize); 525 return (EINVAL); 526 } 527 } 528 529 /* Check group descriptors */ 530 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) && 531 es->e3fs_desc_size != E2FS_64BIT_GD_SIZE) { 532 printf("ext2fs: unsupported 64bit descriptor size %u\n", 533 es->e3fs_desc_size); 534 return (EINVAL); 535 } 536 537 fs->e2fs_bpg = es->e2fs_bpg; 538 fs->e2fs_fpg = es->e2fs_fpg; 539 if (fs->e2fs_bpg == 0 || fs->e2fs_fpg == 0) { 540 printf("ext2fs: zero blocks/fragments per group\n"); 541 return (EINVAL); 542 } 543 if (fs->e2fs_bpg != fs->e2fs_bsize * 8) { 544 printf("ext2fs: non-standard group size unsupported %d\n", 545 fs->e2fs_bpg); 546 return (EINVAL); 547 } 548 549 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 550 if (fs->e2fs_ipb == 0 || 551 fs->e2fs_ipb > fs->e2fs_bsize / E2FS_REV0_INODE_SIZE) { 552 printf("ext2fs: bad inodes per block size\n"); 553 return (EINVAL); 554 } 555 556 fs->e2fs_ipg = es->e2fs_ipg; 557 if (fs->e2fs_ipg < fs->e2fs_ipb || fs->e2fs_ipg > fs->e2fs_bsize * 8) { 558 printf("ext2fs: invalid inodes per group: %u\n", fs->e2fs_ipb); 559 return (EINVAL); 560 } 561 562 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 563 564 fs->e2fs_bcount = es->e2fs_bcount; 565 fs->e2fs_rbcount = es->e2fs_rbcount; 566 fs->e2fs_fbcount = es->e2fs_fbcount; 567 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 568 fs->e2fs_bcount |= (uint64_t)(es->e4fs_bcount_hi) << 32; 569 fs->e2fs_rbcount |= (uint64_t)(es->e4fs_rbcount_hi) << 32; 570 fs->e2fs_fbcount |= (uint64_t)(es->e4fs_fbcount_hi) << 32; 571 } 572 if (fs->e2fs_rbcount > fs->e2fs_bcount || 573 fs->e2fs_fbcount > fs->e2fs_bcount) { 574 printf("ext2fs: invalid block count\n"); 575 return (EINVAL); 576 } 577 if (es->e2fs_first_dblock >= fs->e2fs_bcount) { 578 printf("ext2fs: first data block out of range\n"); 579 return (EINVAL); 580 } 581 582 fs->e2fs_gcount = howmany(fs->e2fs_bcount - es->e2fs_first_dblock, 583 EXT2_BLOCKS_PER_GROUP(fs)); 584 if (fs->e2fs_gcount > ((uint64_t)1 << 32) - EXT2_DESCS_PER_BLOCK(fs)) { 585 printf("ext2fs: groups count too large: %u\n", fs->e2fs_gcount); 586 return (EINVAL); 587 } 588 589 /* Check for extra isize in big inodes. */ 590 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 591 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 592 printf("ext2fs: no space for extra inode timestamps\n"); 593 return (EINVAL); 594 } 595 596 /* s_resuid / s_resgid ? */ 597 598 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 599 e2fs_descpb = fs->e2fs_bsize / E2FS_64BIT_GD_SIZE; 600 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb); 601 } else { 602 e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 603 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, 604 fs->e2fs_bsize / sizeof(struct ext2_gd)); 605 } 606 fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb); 607 fs->e2fs_gd = malloc(e2fs_gdbcount_alloc * fs->e2fs_bsize, 608 M_EXT2MNT, M_WAITOK | M_ZERO); 609 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 610 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 611 612 for (i = 0; i < fs->e2fs_gdbcount; i++) { 613 error = bread(devvp, 614 fsbtodb(fs, ext2_cg_location(fs, i)), 615 fs->e2fs_bsize, NOCRED, &bp); 616 if (error) { 617 /* 618 * fs->e2fs_gd and fs->e2fs_contigdirs 619 * will be freed later by the caller, 620 * because this function could be called from 621 * MNT_UPDATE path. 622 */ 623 brelse(bp); 624 return (error); 625 } 626 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 627 memcpy(&fs->e2fs_gd[ 628 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 629 bp->b_data, fs->e2fs_bsize); 630 } else { 631 for (j = 0; j < e2fs_descpb && 632 g_count < fs->e2fs_gcount; j++, g_count++) 633 memcpy(&fs->e2fs_gd[g_count], 634 bp->b_data + j * E2FS_REV0_GD_SIZE, 635 E2FS_REV0_GD_SIZE); 636 } 637 brelse(bp); 638 bp = NULL; 639 } 640 641 /* Validate cgs consistency */ 642 error = ext2_cg_validate(fs); 643 if (error) 644 return (error); 645 646 /* Verfy cgs csum */ 647 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 648 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 649 error = ext2_gd_csum_verify(fs, devvp->v_rdev); 650 if (error) 651 return (error); 652 } 653 /* Initialization for the ext2 Orlov allocator variant. */ 654 fs->e2fs_total_dir = 0; 655 for (i = 0; i < fs->e2fs_gcount; i++) 656 fs->e2fs_total_dir += e2fs_gd_get_ndirs(&fs->e2fs_gd[i]); 657 658 if (es->e2fs_rev == E2FS_REV0 || 659 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 660 fs->e2fs_maxfilesize = 0x7fffffff; 661 else { 662 fs->e2fs_maxfilesize = 0xffffffffffff; 663 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 664 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 665 } 666 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) { 667 fs->e2fs_uhash = 3; 668 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) { 669 #ifdef __CHAR_UNSIGNED__ 670 es->e4fs_flags |= E2FS_UNSIGNED_HASH; 671 fs->e2fs_uhash = 3; 672 #else 673 es->e4fs_flags |= E2FS_SIGNED_HASH; 674 #endif 675 } 676 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 677 error = ext2_sb_csum_verify(fs); 678 679 return (error); 680 } 681 682 /* 683 * Reload all incore data for a filesystem (used after running fsck on 684 * the root filesystem and finding things to fix). The filesystem must 685 * be mounted read-only. 686 * 687 * Things to do to update the mount: 688 * 1) invalidate all cached meta-data. 689 * 2) re-read superblock from disk. 690 * 3) invalidate all cluster summary information. 691 * 4) invalidate all inactive vnodes. 692 * 5) invalidate all cached file data. 693 * 6) re-read inode data for all active vnodes. 694 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 695 */ 696 static int 697 ext2_reload(struct mount *mp, struct thread *td) 698 { 699 struct vnode *vp, *mvp, *devvp; 700 struct inode *ip; 701 struct buf *bp; 702 struct ext2fs *es; 703 struct m_ext2fs *fs; 704 struct csum *sump; 705 int error, i; 706 int32_t *lp; 707 708 if ((mp->mnt_flag & MNT_RDONLY) == 0) 709 return (EINVAL); 710 /* 711 * Step 1: invalidate all cached meta-data. 712 */ 713 devvp = VFSTOEXT2(mp)->um_devvp; 714 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 715 if (vinvalbuf(devvp, 0, 0, 0) != 0) 716 panic("ext2_reload: dirty1"); 717 VOP_UNLOCK(devvp, 0); 718 719 /* 720 * Step 2: re-read superblock from disk. 721 * constants have been adjusted for ext2 722 */ 723 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 724 return (error); 725 es = (struct ext2fs *)bp->b_data; 726 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 727 brelse(bp); 728 return (EIO); /* XXX needs translation */ 729 } 730 fs = VFSTOEXT2(mp)->um_e2fs; 731 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 732 733 if ((error = ext2_compute_sb_data(devvp, es, fs)) != 0) { 734 brelse(bp); 735 return (error); 736 } 737 #ifdef UNKLAR 738 if (fs->fs_sbsize < SBSIZE) 739 bp->b_flags |= B_INVAL; 740 #endif 741 brelse(bp); 742 743 /* 744 * Step 3: invalidate all cluster summary information. 745 */ 746 if (fs->e2fs_contigsumsize > 0) { 747 lp = fs->e2fs_maxcluster; 748 sump = fs->e2fs_clustersum; 749 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 750 *lp++ = fs->e2fs_contigsumsize; 751 sump->cs_init = 0; 752 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 753 } 754 } 755 756 loop: 757 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 758 /* 759 * Step 4: invalidate all cached file data. 760 */ 761 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 762 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 763 goto loop; 764 } 765 if (vinvalbuf(vp, 0, 0, 0)) 766 panic("ext2_reload: dirty2"); 767 768 /* 769 * Step 5: re-read inode data for all active vnodes. 770 */ 771 ip = VTOI(vp); 772 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 773 (int)fs->e2fs_bsize, NOCRED, &bp); 774 if (error) { 775 VOP_UNLOCK(vp, 0); 776 vrele(vp); 777 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 778 return (error); 779 } 780 781 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 782 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 783 784 brelse(bp); 785 VOP_UNLOCK(vp, 0); 786 vrele(vp); 787 788 if (error) { 789 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 790 return (error); 791 } 792 } 793 return (0); 794 } 795 796 /* 797 * Common code for mount and mountroot. 798 */ 799 static int 800 ext2_mountfs(struct vnode *devvp, struct mount *mp) 801 { 802 struct ext2mount *ump; 803 struct buf *bp; 804 struct m_ext2fs *fs; 805 struct ext2fs *es; 806 struct cdev *dev = devvp->v_rdev; 807 struct g_consumer *cp; 808 struct bufobj *bo; 809 struct csum *sump; 810 int error; 811 int ronly; 812 int i; 813 u_long size; 814 int32_t *lp; 815 int32_t e2fs_maxcontig; 816 817 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 818 /* XXX: use VOP_ACESS to check FS perms */ 819 g_topology_lock(); 820 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 821 g_topology_unlock(); 822 VOP_UNLOCK(devvp, 0); 823 if (error) 824 return (error); 825 826 /* XXX: should we check for some sectorsize or 512 instead? */ 827 if (((SBSIZE % cp->provider->sectorsize) != 0) || 828 (SBSIZE < cp->provider->sectorsize)) { 829 g_topology_lock(); 830 g_vfs_close(cp); 831 g_topology_unlock(); 832 return (EINVAL); 833 } 834 835 bo = &devvp->v_bufobj; 836 bo->bo_private = cp; 837 bo->bo_ops = g_vfs_bufops; 838 if (devvp->v_rdev->si_iosize_max != 0) 839 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 840 if (mp->mnt_iosize_max > MAXPHYS) 841 mp->mnt_iosize_max = MAXPHYS; 842 843 bp = NULL; 844 ump = NULL; 845 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 846 goto out; 847 es = (struct ext2fs *)bp->b_data; 848 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 849 error = EINVAL; /* XXX needs translation */ 850 goto out; 851 } 852 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 853 (es->e2fs_state & E2FS_ERRORS)) { 854 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 855 printf( 856 "WARNING: Filesystem was not properly dismounted\n"); 857 } else { 858 printf( 859 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 860 error = EPERM; 861 goto out; 862 } 863 } 864 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 865 866 /* 867 * I don't know whether this is the right strategy. Note that 868 * we dynamically allocate both an m_ext2fs and an ext2fs 869 * while Linux keeps the super block in a locked buffer. 870 */ 871 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 872 M_EXT2MNT, M_WAITOK | M_ZERO); 873 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 874 M_EXT2MNT, M_WAITOK); 875 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 876 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 877 if ((error = ext2_compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 878 goto out; 879 880 /* 881 * Calculate the maximum contiguous blocks and size of cluster summary 882 * array. In FFS this is done by newfs; however, the superblock 883 * in ext2fs doesn't have these variables, so we can calculate 884 * them here. 885 */ 886 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 887 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 888 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 889 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 890 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 891 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 892 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 893 lp = ump->um_e2fs->e2fs_maxcluster; 894 sump = ump->um_e2fs->e2fs_clustersum; 895 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 896 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 897 sump->cs_init = 0; 898 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 899 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 900 } 901 } 902 903 brelse(bp); 904 bp = NULL; 905 fs = ump->um_e2fs; 906 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 907 908 /* 909 * If the fs is not mounted read-only, make sure the super block is 910 * always written back on a sync(). 911 */ 912 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 913 if (ronly == 0) { 914 fs->e2fs_fmod = 1; /* mark it modified */ 915 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 916 } 917 mp->mnt_data = ump; 918 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 919 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 920 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 921 MNT_ILOCK(mp); 922 mp->mnt_flag |= MNT_LOCAL; 923 MNT_IUNLOCK(mp); 924 ump->um_mountp = mp; 925 ump->um_dev = dev; 926 ump->um_devvp = devvp; 927 ump->um_bo = &devvp->v_bufobj; 928 ump->um_cp = cp; 929 930 /* 931 * Setting those two parameters allowed us to use 932 * ufs_bmap w/o changse! 933 */ 934 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 935 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 936 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 937 if (ronly == 0) 938 ext2_sbupdate(ump, MNT_WAIT); 939 /* 940 * Initialize filesystem stat information in mount struct. 941 */ 942 MNT_ILOCK(mp); 943 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 944 MNTK_USES_BCACHE; 945 MNT_IUNLOCK(mp); 946 return (0); 947 out: 948 if (bp) 949 brelse(bp); 950 if (cp != NULL) { 951 g_topology_lock(); 952 g_vfs_close(cp); 953 g_topology_unlock(); 954 } 955 if (ump) { 956 mtx_destroy(EXT2_MTX(ump)); 957 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 958 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 959 free(ump->um_e2fs->e2fs, M_EXT2MNT); 960 free(ump->um_e2fs, M_EXT2MNT); 961 free(ump, M_EXT2MNT); 962 mp->mnt_data = NULL; 963 } 964 return (error); 965 } 966 967 /* 968 * Unmount system call. 969 */ 970 static int 971 ext2_unmount(struct mount *mp, int mntflags) 972 { 973 struct ext2mount *ump; 974 struct m_ext2fs *fs; 975 struct csum *sump; 976 int error, flags, i, ronly; 977 978 flags = 0; 979 if (mntflags & MNT_FORCE) { 980 if (mp->mnt_flag & MNT_ROOTFS) 981 return (EINVAL); 982 flags |= FORCECLOSE; 983 } 984 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 985 return (error); 986 ump = VFSTOEXT2(mp); 987 fs = ump->um_e2fs; 988 ronly = fs->e2fs_ronly; 989 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 990 if (fs->e2fs_wasvalid) 991 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 992 ext2_sbupdate(ump, MNT_WAIT); 993 } 994 995 g_topology_lock(); 996 g_vfs_close(ump->um_cp); 997 g_topology_unlock(); 998 vrele(ump->um_devvp); 999 sump = fs->e2fs_clustersum; 1000 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 1001 free(sump->cs_sum, M_EXT2MNT); 1002 free(fs->e2fs_clustersum, M_EXT2MNT); 1003 free(fs->e2fs_maxcluster, M_EXT2MNT); 1004 free(fs->e2fs_gd, M_EXT2MNT); 1005 free(fs->e2fs_contigdirs, M_EXT2MNT); 1006 free(fs->e2fs, M_EXT2MNT); 1007 free(fs, M_EXT2MNT); 1008 free(ump, M_EXT2MNT); 1009 mp->mnt_data = NULL; 1010 MNT_ILOCK(mp); 1011 mp->mnt_flag &= ~MNT_LOCAL; 1012 MNT_IUNLOCK(mp); 1013 return (error); 1014 } 1015 1016 /* 1017 * Flush out all the files in a filesystem. 1018 */ 1019 static int 1020 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 1021 { 1022 int error; 1023 1024 error = vflush(mp, 0, flags, td); 1025 return (error); 1026 } 1027 1028 /* 1029 * Get filesystem statistics. 1030 */ 1031 int 1032 ext2_statfs(struct mount *mp, struct statfs *sbp) 1033 { 1034 struct ext2mount *ump; 1035 struct m_ext2fs *fs; 1036 uint32_t overhead, overhead_per_group, ngdb; 1037 int i, ngroups; 1038 1039 ump = VFSTOEXT2(mp); 1040 fs = ump->um_e2fs; 1041 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 1042 panic("ext2_statfs"); 1043 1044 /* 1045 * Compute the overhead (FS structures) 1046 */ 1047 overhead_per_group = 1048 1 /* block bitmap */ + 1049 1 /* inode bitmap */ + 1050 fs->e2fs_itpg; 1051 overhead = fs->e2fs->e2fs_first_dblock + 1052 fs->e2fs_gcount * overhead_per_group; 1053 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 1054 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 1055 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 1056 if (ext2_cg_has_sb(fs, i)) 1057 ngroups++; 1058 } 1059 } else { 1060 ngroups = fs->e2fs_gcount; 1061 } 1062 ngdb = fs->e2fs_gdbcount; 1063 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 1064 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 1065 ngdb += fs->e2fs->e2fs_reserved_ngdb; 1066 overhead += ngroups * (1 /* superblock */ + ngdb); 1067 1068 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 1069 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 1070 sbp->f_blocks = fs->e2fs_bcount - overhead; 1071 sbp->f_bfree = fs->e2fs_fbcount; 1072 sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount; 1073 sbp->f_files = fs->e2fs->e2fs_icount; 1074 sbp->f_ffree = fs->e2fs->e2fs_ficount; 1075 return (0); 1076 } 1077 1078 /* 1079 * Go through the disk queues to initiate sandbagged IO; 1080 * go through the inodes to write those that have been modified; 1081 * initiate the writing of the super block if it has been modified. 1082 * 1083 * Note: we are always called with the filesystem marked `MPBUSY'. 1084 */ 1085 static int 1086 ext2_sync(struct mount *mp, int waitfor) 1087 { 1088 struct vnode *mvp, *vp; 1089 struct thread *td; 1090 struct inode *ip; 1091 struct ext2mount *ump = VFSTOEXT2(mp); 1092 struct m_ext2fs *fs; 1093 int error, allerror = 0; 1094 1095 td = curthread; 1096 fs = ump->um_e2fs; 1097 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 1098 printf("fs = %s\n", fs->e2fs_fsmnt); 1099 panic("ext2_sync: rofs mod"); 1100 } 1101 1102 /* 1103 * Write back each (modified) inode. 1104 */ 1105 loop: 1106 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1107 if (vp->v_type == VNON) { 1108 VI_UNLOCK(vp); 1109 continue; 1110 } 1111 ip = VTOI(vp); 1112 if ((ip->i_flag & 1113 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 1114 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 1115 waitfor == MNT_LAZY)) { 1116 VI_UNLOCK(vp); 1117 continue; 1118 } 1119 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 1120 if (error) { 1121 if (error == ENOENT) { 1122 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1123 goto loop; 1124 } 1125 continue; 1126 } 1127 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 1128 allerror = error; 1129 VOP_UNLOCK(vp, 0); 1130 vrele(vp); 1131 } 1132 1133 /* 1134 * Force stale filesystem control information to be flushed. 1135 */ 1136 if (waitfor != MNT_LAZY) { 1137 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 1138 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 1139 allerror = error; 1140 VOP_UNLOCK(ump->um_devvp, 0); 1141 } 1142 1143 /* 1144 * Write back modified superblock. 1145 */ 1146 if (fs->e2fs_fmod != 0) { 1147 fs->e2fs_fmod = 0; 1148 fs->e2fs->e2fs_wtime = time_second; 1149 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 1150 allerror = error; 1151 } 1152 return (allerror); 1153 } 1154 1155 /* 1156 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 1157 * in from disk. If it is in core, wait for the lock bit to clear, then 1158 * return the inode locked. Detection and handling of mount points must be 1159 * done by the calling routine. 1160 */ 1161 static int 1162 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 1163 { 1164 struct m_ext2fs *fs; 1165 struct inode *ip; 1166 struct ext2mount *ump; 1167 struct buf *bp; 1168 struct vnode *vp; 1169 struct thread *td; 1170 unsigned int i, used_blocks; 1171 int error; 1172 1173 td = curthread; 1174 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 1175 if (error || *vpp != NULL) 1176 return (error); 1177 1178 ump = VFSTOEXT2(mp); 1179 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 1180 1181 /* Allocate a new vnode/inode. */ 1182 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 1183 *vpp = NULL; 1184 free(ip, M_EXT2NODE); 1185 return (error); 1186 } 1187 vp->v_data = ip; 1188 ip->i_vnode = vp; 1189 ip->i_e2fs = fs = ump->um_e2fs; 1190 ip->i_ump = ump; 1191 ip->i_number = ino; 1192 1193 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 1194 error = insmntque(vp, mp); 1195 if (error != 0) { 1196 free(ip, M_EXT2NODE); 1197 *vpp = NULL; 1198 return (error); 1199 } 1200 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 1201 if (error || *vpp != NULL) 1202 return (error); 1203 1204 /* Read in the disk contents for the inode, copy into the inode. */ 1205 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 1206 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 1207 /* 1208 * The inode does not contain anything useful, so it would 1209 * be misleading to leave it on its hash chain. With mode 1210 * still zero, it will be unlinked and returned to the free 1211 * list by vput(). 1212 */ 1213 brelse(bp); 1214 vput(vp); 1215 *vpp = NULL; 1216 return (error); 1217 } 1218 /* convert ext2 inode to dinode */ 1219 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 1220 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ino)), ip); 1221 if (error) { 1222 brelse(bp); 1223 vput(vp); 1224 *vpp = NULL; 1225 return (error); 1226 } 1227 ip->i_block_group = ino_to_cg(fs, ino); 1228 ip->i_next_alloc_block = 0; 1229 ip->i_next_alloc_goal = 0; 1230 1231 /* 1232 * Now we want to make sure that block pointers for unused 1233 * blocks are zeroed out - ext2_balloc depends on this 1234 * although for regular files and directories only 1235 * 1236 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 1237 * out because we could corrupt the extent tree. 1238 */ 1239 if (!(ip->i_flag & IN_E4EXTENTS) && 1240 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 1241 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 1242 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 1243 ip->i_db[i] = 0; 1244 } 1245 #ifdef EXT2FS_DEBUG 1246 ext2_print_inode(ip); 1247 ext4_ext_print_extent_tree_status(ip); 1248 #endif 1249 bqrelse(bp); 1250 1251 /* 1252 * Initialize the vnode from the inode, check for aliases. 1253 * Note that the underlying vnode may have changed. 1254 */ 1255 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 1256 vput(vp); 1257 *vpp = NULL; 1258 return (error); 1259 } 1260 1261 /* 1262 * Finish inode initialization. 1263 */ 1264 1265 *vpp = vp; 1266 return (0); 1267 } 1268 1269 /* 1270 * File handle to vnode 1271 * 1272 * Have to be really careful about stale file handles: 1273 * - check that the inode number is valid 1274 * - call ext2_vget() to get the locked inode 1275 * - check for an unallocated inode (i_mode == 0) 1276 * - check that the given client host has export rights and return 1277 * those rights via. exflagsp and credanonp 1278 */ 1279 static int 1280 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1281 { 1282 struct inode *ip; 1283 struct ufid *ufhp; 1284 struct vnode *nvp; 1285 struct m_ext2fs *fs; 1286 int error; 1287 1288 ufhp = (struct ufid *)fhp; 1289 fs = VFSTOEXT2(mp)->um_e2fs; 1290 if (ufhp->ufid_ino < EXT2_ROOTINO || 1291 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1292 return (ESTALE); 1293 1294 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1295 if (error) { 1296 *vpp = NULLVP; 1297 return (error); 1298 } 1299 ip = VTOI(nvp); 1300 if (ip->i_mode == 0 || 1301 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1302 vput(nvp); 1303 *vpp = NULLVP; 1304 return (ESTALE); 1305 } 1306 *vpp = nvp; 1307 vnode_create_vobject(*vpp, 0, curthread); 1308 return (0); 1309 } 1310 1311 /* 1312 * Write a superblock and associated information back to disk. 1313 */ 1314 static int 1315 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1316 { 1317 struct m_ext2fs *fs = mp->um_e2fs; 1318 struct ext2fs *es = fs->e2fs; 1319 struct buf *bp; 1320 int error = 0; 1321 1322 es->e2fs_bcount = fs->e2fs_bcount & 0xffffffff; 1323 es->e2fs_rbcount = fs->e2fs_rbcount & 0xffffffff; 1324 es->e2fs_fbcount = fs->e2fs_fbcount & 0xffffffff; 1325 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1326 es->e4fs_bcount_hi = fs->e2fs_bcount >> 32; 1327 es->e4fs_rbcount_hi = fs->e2fs_rbcount >> 32; 1328 es->e4fs_fbcount_hi = fs->e2fs_fbcount >> 32; 1329 } 1330 1331 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1332 ext2_sb_csum_set(fs); 1333 1334 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1335 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1336 if (waitfor == MNT_WAIT) 1337 error = bwrite(bp); 1338 else 1339 bawrite(bp); 1340 1341 /* 1342 * The buffers for group descriptors, inode bitmaps and block bitmaps 1343 * are not busy at this point and are (hopefully) written by the 1344 * usual sync mechanism. No need to write them here. 1345 */ 1346 return (error); 1347 } 1348 int 1349 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1350 { 1351 struct m_ext2fs *fs = mp->um_e2fs; 1352 struct buf *bp; 1353 int i, j, g_count = 0, error = 0, allerror = 0; 1354 1355 allerror = ext2_sbupdate(mp, waitfor); 1356 1357 /* Update gd csums */ 1358 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 1359 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1360 ext2_gd_csum_set(fs); 1361 1362 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1363 bp = getblk(mp->um_devvp, fsbtodb(fs, 1364 ext2_cg_location(fs, i)), 1365 fs->e2fs_bsize, 0, 0, 0); 1366 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1367 memcpy(bp->b_data, &fs->e2fs_gd[ 1368 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1369 fs->e2fs_bsize); 1370 } else { 1371 for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE && 1372 g_count < fs->e2fs_gcount; j++, g_count++) 1373 memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE, 1374 &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE); 1375 } 1376 if (waitfor == MNT_WAIT) 1377 error = bwrite(bp); 1378 else 1379 bawrite(bp); 1380 } 1381 1382 if (!allerror && error) 1383 allerror = error; 1384 return (allerror); 1385 } 1386 1387 /* 1388 * Return the root of a filesystem. 1389 */ 1390 static int 1391 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1392 { 1393 struct vnode *nvp; 1394 int error; 1395 1396 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1397 if (error) 1398 return (error); 1399 *vpp = nvp; 1400 return (0); 1401 } 1402