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 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/namei.h> 43 #include <sys/priv.h> 44 #include <sys/proc.h> 45 #include <sys/kernel.h> 46 #include <sys/vnode.h> 47 #include <sys/mount.h> 48 #include <sys/bio.h> 49 #include <sys/buf.h> 50 #include <sys/conf.h> 51 #include <sys/endian.h> 52 #include <sys/fcntl.h> 53 #include <sys/malloc.h> 54 #include <sys/sdt.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 SDT_PROVIDER_DECLARE(ext2fs); 71 /* 72 * ext2fs trace probe: 73 * arg0: verbosity. Higher numbers give more verbose messages 74 * arg1: Textual message 75 */ 76 SDT_PROBE_DEFINE2(ext2fs, , vfsops, trace, "int", "char*"); 77 SDT_PROBE_DEFINE2(ext2fs, , vfsops, ext2_cg_validate_error, "char*", "int"); 78 SDT_PROBE_DEFINE1(ext2fs, , vfsops, ext2_compute_sb_data_error, "char*"); 79 80 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td); 81 static int ext2_mountfs(struct vnode *, struct mount *); 82 static int ext2_reload(struct mount *mp, struct thread *td); 83 static int ext2_sbupdate(struct ext2mount *, int); 84 static int ext2_cgupdate(struct ext2mount *, int); 85 static vfs_unmount_t ext2_unmount; 86 static vfs_root_t ext2_root; 87 static vfs_statfs_t ext2_statfs; 88 static vfs_sync_t ext2_sync; 89 static vfs_vget_t ext2_vget; 90 static vfs_fhtovp_t ext2_fhtovp; 91 static vfs_mount_t ext2_mount; 92 93 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part"); 94 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure"); 95 96 static struct vfsops ext2fs_vfsops = { 97 .vfs_fhtovp = ext2_fhtovp, 98 .vfs_mount = ext2_mount, 99 .vfs_root = ext2_root, /* root inode via vget */ 100 .vfs_statfs = ext2_statfs, 101 .vfs_sync = ext2_sync, 102 .vfs_unmount = ext2_unmount, 103 .vfs_vget = ext2_vget, 104 }; 105 106 VFS_SET(ext2fs_vfsops, ext2fs, 0); 107 108 static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, 109 int ronly); 110 static int ext2_compute_sb_data(struct vnode * devvp, 111 struct ext2fs * es, struct m_ext2fs * fs); 112 113 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr", 114 "noclusterw", "noexec", "export", "force", "from", "multilabel", 115 "suiddir", "nosymfollow", "sync", "union", NULL }; 116 117 /* 118 * VFS Operations. 119 * 120 * mount system call 121 */ 122 static int 123 ext2_mount(struct mount *mp) 124 { 125 struct vfsoptlist *opts; 126 struct vnode *devvp; 127 struct thread *td; 128 struct ext2mount *ump = NULL; 129 struct m_ext2fs *fs; 130 struct nameidata nd, *ndp = &nd; 131 accmode_t accmode; 132 char *path, *fspec; 133 int error, flags, len; 134 135 td = curthread; 136 opts = mp->mnt_optnew; 137 138 if (vfs_filteropt(opts, ext2_opts)) 139 return (EINVAL); 140 141 vfs_getopt(opts, "fspath", (void **)&path, NULL); 142 /* Double-check the length of path.. */ 143 if (strlen(path) >= MAXMNTLEN) 144 return (ENAMETOOLONG); 145 146 fspec = NULL; 147 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 148 if (!error && fspec[len - 1] != '\0') 149 return (EINVAL); 150 151 /* 152 * If updating, check whether changing from read-only to 153 * read/write; if there is no device name, that's all we do. 154 */ 155 if (mp->mnt_flag & MNT_UPDATE) { 156 ump = VFSTOEXT2(mp); 157 fs = ump->um_e2fs; 158 error = 0; 159 if (fs->e2fs_ronly == 0 && 160 vfs_flagopt(opts, "ro", NULL, 0)) { 161 error = VFS_SYNC(mp, MNT_WAIT); 162 if (error) 163 return (error); 164 flags = WRITECLOSE; 165 if (mp->mnt_flag & MNT_FORCE) 166 flags |= FORCECLOSE; 167 error = ext2_flushfiles(mp, flags, td); 168 if (error == 0 && fs->e2fs_wasvalid && 169 ext2_cgupdate(ump, MNT_WAIT) == 0) { 170 fs->e2fs->e2fs_state = 171 htole16((le16toh(fs->e2fs->e2fs_state) | 172 E2FS_ISCLEAN)); 173 ext2_sbupdate(ump, MNT_WAIT); 174 } 175 fs->e2fs_ronly = 1; 176 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY); 177 g_topology_lock(); 178 g_access(ump->um_cp, 0, -1, 0); 179 g_topology_unlock(); 180 } 181 if (!error && (mp->mnt_flag & MNT_RELOAD)) 182 error = ext2_reload(mp, td); 183 if (error) 184 return (error); 185 devvp = ump->um_devvp; 186 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) { 187 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0)) 188 return (EPERM); 189 190 /* 191 * If upgrade to read-write by non-root, then verify 192 * that user has necessary permissions on the device. 193 */ 194 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 195 error = VOP_ACCESS(devvp, VREAD | VWRITE, 196 td->td_ucred, td); 197 if (error) 198 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 199 if (error) { 200 VOP_UNLOCK(devvp); 201 return (error); 202 } 203 VOP_UNLOCK(devvp); 204 g_topology_lock(); 205 error = g_access(ump->um_cp, 0, 1, 0); 206 g_topology_unlock(); 207 if (error) 208 return (error); 209 210 if ((le16toh(fs->e2fs->e2fs_state) & E2FS_ISCLEAN) == 0 || 211 (le16toh(fs->e2fs->e2fs_state) & E2FS_ERRORS)) { 212 if (mp->mnt_flag & MNT_FORCE) { 213 printf( 214 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt); 215 } else { 216 printf( 217 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 218 fs->e2fs_fsmnt); 219 return (EPERM); 220 } 221 } 222 fs->e2fs->e2fs_state = 223 htole16(le16toh(fs->e2fs->e2fs_state) & ~E2FS_ISCLEAN); 224 (void)ext2_cgupdate(ump, MNT_WAIT); 225 fs->e2fs_ronly = 0; 226 MNT_ILOCK(mp); 227 mp->mnt_flag &= ~MNT_RDONLY; 228 MNT_IUNLOCK(mp); 229 } 230 if (vfs_flagopt(opts, "export", NULL, 0)) { 231 /* Process export requests in vfs_mount.c. */ 232 return (error); 233 } 234 } 235 236 /* 237 * Not an update, or updating the name: look up the name 238 * and verify that it refers to a sensible disk device. 239 */ 240 if (fspec == NULL) 241 return (EINVAL); 242 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec); 243 if ((error = namei(ndp)) != 0) 244 return (error); 245 NDFREE_PNBUF(ndp); 246 devvp = ndp->ni_vp; 247 248 if (!vn_isdisk_error(devvp, &error)) { 249 vput(devvp); 250 return (error); 251 } 252 253 /* 254 * If mount by non-root, then verify that user has necessary 255 * permissions on the device. 256 * 257 * XXXRW: VOP_ACCESS() enough? 258 */ 259 accmode = VREAD; 260 if ((mp->mnt_flag & MNT_RDONLY) == 0) 261 accmode |= VWRITE; 262 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 263 if (error) 264 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 265 if (error) { 266 vput(devvp); 267 return (error); 268 } 269 270 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 271 error = ext2_mountfs(devvp, mp); 272 } else { 273 if (devvp != ump->um_devvp) { 274 vput(devvp); 275 return (EINVAL); /* needs translation */ 276 } else 277 vput(devvp); 278 } 279 if (error) { 280 vrele(devvp); 281 return (error); 282 } 283 ump = VFSTOEXT2(mp); 284 fs = ump->um_e2fs; 285 286 /* 287 * Note that this strncpy() is ok because of a check at the start 288 * of ext2_mount(). 289 */ 290 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN); 291 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0'; 292 vfs_mountedfrom(mp, fspec); 293 return (0); 294 } 295 296 static int 297 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly) 298 { 299 uint32_t i, mask; 300 301 if (le16toh(es->e2fs_magic) != E2FS_MAGIC) { 302 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 303 devtoname(dev), le16toh(es->e2fs_magic), E2FS_MAGIC); 304 return (1); 305 } 306 if (le32toh(es->e2fs_rev) > E2FS_REV0) { 307 mask = le32toh(es->e2fs_features_incompat) & ~(EXT2F_INCOMPAT_SUPP); 308 if (mask) { 309 printf("WARNING: mount of %s denied due to " 310 "unsupported optional features:\n", devtoname(dev)); 311 for (i = 0; 312 i < sizeof(incompat)/sizeof(struct ext2_feature); 313 i++) 314 if (mask & incompat[i].mask) 315 printf("%s ", incompat[i].name); 316 printf("\n"); 317 return (1); 318 } 319 mask = le32toh(es->e2fs_features_rocompat) & ~EXT2F_ROCOMPAT_SUPP; 320 if (!ronly && mask) { 321 printf("WARNING: R/W mount of %s denied due to " 322 "unsupported optional features:\n", devtoname(dev)); 323 for (i = 0; 324 i < sizeof(ro_compat)/sizeof(struct ext2_feature); 325 i++) 326 if (mask & ro_compat[i].mask) 327 printf("%s ", ro_compat[i].name); 328 printf("\n"); 329 return (1); 330 } 331 } 332 return (0); 333 } 334 335 static e4fs_daddr_t 336 ext2_cg_location(struct m_ext2fs *fs, int number) 337 { 338 int cg, descpb, logical_sb, has_super = 0; 339 340 /* 341 * Adjust logical superblock block number. 342 * Godmar thinks: if the blocksize is greater than 1024, then 343 * the superblock is logically part of block zero. 344 */ 345 logical_sb = fs->e2fs_bsize > SBLOCKSIZE ? 0 : 1; 346 347 if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_META_BG) || 348 number < le32toh(fs->e2fs->e3fs_first_meta_bg)) 349 return (logical_sb + number + 1); 350 351 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) 352 descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 353 else 354 descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 355 356 cg = descpb * number; 357 358 if (ext2_cg_has_sb(fs, cg)) 359 has_super = 1; 360 361 return (has_super + cg * (e4fs_daddr_t)EXT2_BLOCKS_PER_GROUP(fs) + 362 le32toh(fs->e2fs->e2fs_first_dblock)); 363 } 364 365 static int 366 ext2_cg_validate(struct m_ext2fs *fs) 367 { 368 uint64_t b_bitmap; 369 uint64_t i_bitmap; 370 uint64_t i_tables; 371 uint64_t first_block, last_block, last_cg_block; 372 struct ext2_gd *gd; 373 unsigned int i, cg_count; 374 375 first_block = le32toh(fs->e2fs->e2fs_first_dblock); 376 last_cg_block = ext2_cg_number_gdb(fs, 0); 377 cg_count = fs->e2fs_gcount; 378 379 for (i = 0; i < fs->e2fs_gcount; i++) { 380 gd = &fs->e2fs_gd[i]; 381 382 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG) || 383 i == fs->e2fs_gcount - 1) { 384 last_block = fs->e2fs_bcount - 1; 385 } else { 386 last_block = first_block + 387 (EXT2_BLOCKS_PER_GROUP(fs) - 1); 388 } 389 390 if ((cg_count == fs->e2fs_gcount) && 391 !(le16toh(gd->ext4bgd_flags) & EXT2_BG_INODE_ZEROED)) 392 cg_count = i; 393 394 b_bitmap = e2fs_gd_get_b_bitmap(gd); 395 if (b_bitmap == 0) { 396 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error, 397 "block bitmap is zero", i); 398 return (EINVAL); 399 } 400 if (b_bitmap <= last_cg_block) { 401 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error, 402 "block bitmap overlaps gds", i); 403 return (EINVAL); 404 } 405 if (b_bitmap < first_block || b_bitmap > last_block) { 406 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error, 407 "block bitmap not in group", i); 408 return (EINVAL); 409 } 410 411 i_bitmap = e2fs_gd_get_i_bitmap(gd); 412 if (i_bitmap == 0) { 413 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error, 414 "inode bitmap is zero", i); 415 return (EINVAL); 416 } 417 if (i_bitmap <= last_cg_block) { 418 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error, 419 "inode bitmap overlaps gds", i); 420 return (EINVAL); 421 } 422 if (i_bitmap < first_block || i_bitmap > last_block) { 423 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error, 424 "inode bitmap not in group blk", i); 425 return (EINVAL); 426 } 427 428 i_tables = e2fs_gd_get_i_tables(gd); 429 if (i_tables == 0) { 430 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error, 431 "inode table is zero", i); 432 return (EINVAL); 433 } 434 if (i_tables <= last_cg_block) { 435 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error, 436 "inode tables overlaps gds", i); 437 return (EINVAL); 438 } 439 if (i_tables < first_block || 440 i_tables + fs->e2fs_itpg - 1 > last_block) { 441 SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error, 442 "inode tables not in group blk", i); 443 return (EINVAL); 444 } 445 446 if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG)) 447 first_block += EXT2_BLOCKS_PER_GROUP(fs); 448 } 449 450 return (0); 451 } 452 453 /* 454 * This computes the fields of the m_ext2fs structure from the 455 * data in the ext2fs structure read in. 456 */ 457 static int 458 ext2_compute_sb_data(struct vnode *devvp, struct ext2fs *es, 459 struct m_ext2fs *fs) 460 { 461 struct buf *bp; 462 uint32_t e2fs_descpb, e2fs_gdbcount_alloc; 463 int i, j; 464 int g_count = 0; 465 int error; 466 467 /* Check checksum features */ 468 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) && 469 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 470 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 471 "incorrect checksum features combination"); 472 return (EINVAL); 473 } 474 475 /* Precompute checksum seed for all metadata */ 476 ext2_sb_csum_set_seed(fs); 477 478 /* Verify sb csum if possible */ 479 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 480 error = ext2_sb_csum_verify(fs); 481 if (error) { 482 return (error); 483 } 484 } 485 486 /* Check for block size = 1K|2K|4K */ 487 if (le32toh(es->e2fs_log_bsize) > 2) { 488 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 489 "bad block size"); 490 return (EINVAL); 491 } 492 493 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + le32toh(es->e2fs_log_bsize); 494 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 495 fs->e2fs_fsbtodb = le32toh(es->e2fs_log_bsize) + 1; 496 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 497 498 /* Check for fragment size */ 499 if (le32toh(es->e2fs_log_fsize) > 500 (EXT2_MAX_FRAG_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE)) { 501 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 502 "invalid log cluster size"); 503 return (EINVAL); 504 } 505 506 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << le32toh(es->e2fs_log_fsize); 507 if (fs->e2fs_fsize != fs->e2fs_bsize) { 508 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 509 "fragment size != block size"); 510 return (EINVAL); 511 } 512 513 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 514 515 /* Check reserved gdt blocks for future filesystem expansion */ 516 if (le16toh(es->e2fs_reserved_ngdb) > (fs->e2fs_bsize / 4)) { 517 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 518 "number of reserved GDT blocks too large"); 519 return (EINVAL); 520 } 521 522 if (le32toh(es->e2fs_rev) == E2FS_REV0) { 523 fs->e2fs_isize = E2FS_REV0_INODE_SIZE; 524 } else { 525 fs->e2fs_isize = le16toh(es->e2fs_inode_size); 526 527 /* 528 * Check first ino. 529 */ 530 if (le32toh(es->e2fs_first_ino) < EXT2_FIRSTINO) { 531 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 532 "invalid first ino"); 533 return (EINVAL); 534 } 535 536 /* 537 * Simple sanity check for superblock inode size value. 538 */ 539 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 540 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 541 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 542 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 543 "invalid inode size"); 544 return (EINVAL); 545 } 546 } 547 548 /* Check group descriptors */ 549 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) && 550 le16toh(es->e3fs_desc_size) != E2FS_64BIT_GD_SIZE) { 551 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 552 "unsupported 64bit descriptor size"); 553 return (EINVAL); 554 } 555 556 fs->e2fs_bpg = le32toh(es->e2fs_bpg); 557 fs->e2fs_fpg = le32toh(es->e2fs_fpg); 558 if (fs->e2fs_bpg == 0 || fs->e2fs_fpg == 0) { 559 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 560 "zero blocks/fragments per group"); 561 return (EINVAL); 562 } else if (fs->e2fs_bpg != fs->e2fs_fpg) { 563 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 564 "blocks per group not equal fragments per group"); 565 return (EINVAL); 566 } 567 568 if (fs->e2fs_bpg != fs->e2fs_bsize * 8) { 569 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 570 "non-standard group size unsupported"); 571 return (EINVAL); 572 } 573 574 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 575 if (fs->e2fs_ipb == 0 || 576 fs->e2fs_ipb > fs->e2fs_bsize / E2FS_REV0_INODE_SIZE) { 577 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 578 "bad inodes per block size"); 579 return (EINVAL); 580 } 581 582 fs->e2fs_ipg = le32toh(es->e2fs_ipg); 583 if (fs->e2fs_ipg < fs->e2fs_ipb || fs->e2fs_ipg > fs->e2fs_bsize * 8) { 584 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 585 "invalid inodes per group"); 586 return (EINVAL); 587 } 588 589 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 590 591 fs->e2fs_bcount = le32toh(es->e2fs_bcount); 592 fs->e2fs_rbcount = le32toh(es->e2fs_rbcount); 593 fs->e2fs_fbcount = le32toh(es->e2fs_fbcount); 594 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 595 fs->e2fs_bcount |= (uint64_t)(le32toh(es->e4fs_bcount_hi)) << 32; 596 fs->e2fs_rbcount |= (uint64_t)(le32toh(es->e4fs_rbcount_hi)) << 32; 597 fs->e2fs_fbcount |= (uint64_t)(le32toh(es->e4fs_fbcount_hi)) << 32; 598 } 599 if (fs->e2fs_rbcount > fs->e2fs_bcount || 600 fs->e2fs_fbcount > fs->e2fs_bcount) { 601 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 602 "invalid block count"); 603 return (EINVAL); 604 } 605 606 fs->e2fs_ficount = le32toh(es->e2fs_ficount); 607 if (fs->e2fs_ficount > le32toh(es->e2fs_icount)) { 608 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 609 "invalid number of free inodes"); 610 return (EINVAL); 611 } 612 613 if (le32toh(es->e2fs_first_dblock) != (fs->e2fs_bsize > 1024 ? 0 : 1) || 614 le32toh(es->e2fs_first_dblock) >= fs->e2fs_bcount) { 615 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 616 "first data block out of range"); 617 return (EINVAL); 618 } 619 620 fs->e2fs_gcount = howmany(fs->e2fs_bcount - 621 le32toh(es->e2fs_first_dblock), EXT2_BLOCKS_PER_GROUP(fs)); 622 if (fs->e2fs_gcount > ((uint64_t)1 << 32) - EXT2_DESCS_PER_BLOCK(fs)) { 623 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 624 "groups count too large"); 625 return (EINVAL); 626 } 627 628 /* Check for extra isize in big inodes. */ 629 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 630 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 631 SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error, 632 "no space for extra inode timestamps"); 633 return (EINVAL); 634 } 635 636 /* s_resuid / s_resgid ? */ 637 638 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 639 e2fs_descpb = fs->e2fs_bsize / E2FS_64BIT_GD_SIZE; 640 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb); 641 } else { 642 e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE; 643 e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, 644 fs->e2fs_bsize / sizeof(struct ext2_gd)); 645 } 646 fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb); 647 fs->e2fs_gd = malloc(e2fs_gdbcount_alloc * fs->e2fs_bsize, 648 M_EXT2MNT, M_WAITOK | M_ZERO); 649 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 650 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 651 652 for (i = 0; i < fs->e2fs_gdbcount; i++) { 653 error = bread(devvp, 654 fsbtodb(fs, ext2_cg_location(fs, i)), 655 fs->e2fs_bsize, NOCRED, &bp); 656 if (error) { 657 /* 658 * fs->e2fs_gd and fs->e2fs_contigdirs 659 * will be freed later by the caller, 660 * because this function could be called from 661 * MNT_UPDATE path. 662 */ 663 return (error); 664 } 665 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 666 memcpy(&fs->e2fs_gd[ 667 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 668 bp->b_data, fs->e2fs_bsize); 669 } else { 670 for (j = 0; j < e2fs_descpb && 671 g_count < fs->e2fs_gcount; j++, g_count++) 672 memcpy(&fs->e2fs_gd[g_count], 673 bp->b_data + j * E2FS_REV0_GD_SIZE, 674 E2FS_REV0_GD_SIZE); 675 } 676 brelse(bp); 677 bp = NULL; 678 } 679 680 /* Validate cgs consistency */ 681 error = ext2_cg_validate(fs); 682 if (error) 683 return (error); 684 685 /* Verfy cgs csum */ 686 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 687 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) { 688 error = ext2_gd_csum_verify(fs, devvp->v_rdev); 689 if (error) 690 return (error); 691 } 692 /* Initialization for the ext2 Orlov allocator variant. */ 693 fs->e2fs_total_dir = 0; 694 for (i = 0; i < fs->e2fs_gcount; i++) 695 fs->e2fs_total_dir += e2fs_gd_get_ndirs(&fs->e2fs_gd[i]); 696 697 if (le32toh(es->e2fs_rev) == E2FS_REV0 || 698 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 699 fs->e2fs_maxfilesize = 0x7fffffff; 700 else { 701 fs->e2fs_maxfilesize = 0xffffffffffff; 702 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 703 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 704 } 705 if (le32toh(es->e4fs_flags) & E2FS_UNSIGNED_HASH) { 706 fs->e2fs_uhash = 3; 707 } else if ((le32toh(es->e4fs_flags) & E2FS_SIGNED_HASH) == 0) { 708 #ifdef __CHAR_UNSIGNED__ 709 es->e4fs_flags = htole32(le32toh(es->e4fs_flags) | E2FS_UNSIGNED_HASH); 710 fs->e2fs_uhash = 3; 711 #else 712 es->e4fs_flags = htole32(le32toh(es->e4fs_flags) | E2FS_SIGNED_HASH); 713 #endif 714 } 715 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 716 error = ext2_sb_csum_verify(fs); 717 718 return (error); 719 } 720 721 /* 722 * Reload all incore data for a filesystem (used after running fsck on 723 * the root filesystem and finding things to fix). The filesystem must 724 * be mounted read-only. 725 * 726 * Things to do to update the mount: 727 * 1) invalidate all cached meta-data. 728 * 2) re-read superblock from disk. 729 * 3) invalidate all cluster summary information. 730 * 4) invalidate all inactive vnodes. 731 * 5) invalidate all cached file data. 732 * 6) re-read inode data for all active vnodes. 733 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 734 */ 735 static int 736 ext2_reload(struct mount *mp, struct thread *td) 737 { 738 struct vnode *vp, *mvp, *devvp; 739 struct inode *ip; 740 struct buf *bp; 741 struct ext2fs *es; 742 struct m_ext2fs *fs; 743 struct csum *sump; 744 int error, i; 745 int32_t *lp; 746 747 if ((mp->mnt_flag & MNT_RDONLY) == 0) 748 return (EINVAL); 749 /* 750 * Step 1: invalidate all cached meta-data. 751 */ 752 devvp = VFSTOEXT2(mp)->um_devvp; 753 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 754 if (vinvalbuf(devvp, 0, 0, 0) != 0) 755 panic("ext2_reload: dirty1"); 756 VOP_UNLOCK(devvp); 757 758 /* 759 * Step 2: re-read superblock from disk. 760 * constants have been adjusted for ext2 761 */ 762 if ((error = bread(devvp, SBLOCK, SBLOCKBLKSIZE, NOCRED, &bp)) != 0) 763 return (error); 764 es = (struct ext2fs *)((char *)bp->b_data + SBLOCKOFFSET); 765 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 766 brelse(bp); 767 return (EIO); /* XXX needs translation */ 768 } 769 fs = VFSTOEXT2(mp)->um_e2fs; 770 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 771 772 if ((error = ext2_compute_sb_data(devvp, es, fs)) != 0) { 773 brelse(bp); 774 return (error); 775 } 776 777 brelse(bp); 778 779 /* 780 * Step 3: invalidate all cluster summary information. 781 */ 782 if (fs->e2fs_contigsumsize > 0) { 783 lp = fs->e2fs_maxcluster; 784 sump = fs->e2fs_clustersum; 785 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 786 *lp++ = fs->e2fs_contigsumsize; 787 sump->cs_init = 0; 788 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 789 } 790 } 791 792 loop: 793 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 794 /* 795 * Step 4: invalidate all cached file data. 796 */ 797 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) { 798 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 799 goto loop; 800 } 801 if (vinvalbuf(vp, 0, 0, 0)) 802 panic("ext2_reload: dirty2"); 803 804 /* 805 * Step 5: re-read inode data for all active vnodes. 806 */ 807 ip = VTOI(vp); 808 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 809 (int)fs->e2fs_bsize, NOCRED, &bp); 810 if (error) { 811 vput(vp); 812 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 813 return (error); 814 } 815 816 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 817 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 818 819 brelse(bp); 820 vput(vp); 821 822 if (error) { 823 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 824 return (error); 825 } 826 } 827 return (0); 828 } 829 830 /* 831 * Common code for mount and mountroot. 832 */ 833 static int 834 ext2_mountfs(struct vnode *devvp, struct mount *mp) 835 { 836 struct ext2mount *ump; 837 struct buf *bp; 838 struct m_ext2fs *fs; 839 struct ext2fs *es; 840 struct cdev *dev = devvp->v_rdev; 841 struct g_consumer *cp; 842 struct bufobj *bo; 843 struct csum *sump; 844 int error; 845 int ronly; 846 int i; 847 u_long size; 848 int32_t *lp; 849 int32_t e2fs_maxcontig; 850 851 bp = NULL; 852 ump = NULL; 853 854 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 855 /* XXX: use VOP_ACESS to check FS perms */ 856 g_topology_lock(); 857 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 858 g_topology_unlock(); 859 VOP_UNLOCK(devvp); 860 if (error) 861 return (error); 862 863 if (PAGE_SIZE != SBLOCKBLKSIZE) { 864 printf("WARNING: Unsupported page size %d\n", PAGE_SIZE); 865 error = EINVAL; 866 goto out; 867 } 868 if (cp->provider->sectorsize > PAGE_SIZE) { 869 printf("WARNING: Device sectorsize(%d) is more than %d\n", 870 cp->provider->sectorsize, PAGE_SIZE); 871 error = EINVAL; 872 goto out; 873 } 874 875 bo = &devvp->v_bufobj; 876 bo->bo_private = cp; 877 bo->bo_ops = g_vfs_bufops; 878 if (devvp->v_rdev->si_iosize_max != 0) 879 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 880 if (mp->mnt_iosize_max > maxphys) 881 mp->mnt_iosize_max = maxphys; 882 if ((error = bread(devvp, SBLOCK, SBLOCKBLKSIZE, NOCRED, &bp)) != 0) 883 goto out; 884 es = (struct ext2fs *)((char *)bp->b_data + SBLOCKOFFSET); 885 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 886 error = EINVAL; /* XXX needs translation */ 887 goto out; 888 } 889 if ((le16toh(es->e2fs_state) & E2FS_ISCLEAN) == 0 || 890 (le16toh(es->e2fs_state) & E2FS_ERRORS)) { 891 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 892 printf( 893 "WARNING: Filesystem was not properly dismounted\n"); 894 } else { 895 printf( 896 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 897 error = EPERM; 898 goto out; 899 } 900 } 901 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 902 903 /* 904 * I don't know whether this is the right strategy. Note that 905 * we dynamically allocate both an m_ext2fs and an ext2fs 906 * while Linux keeps the super block in a locked buffer. 907 */ 908 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 909 M_EXT2MNT, M_WAITOK | M_ZERO); 910 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 911 M_EXT2MNT, M_WAITOK); 912 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 913 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 914 if ((error = ext2_compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 915 goto out; 916 917 /* 918 * Calculate the maximum contiguous blocks and size of cluster summary 919 * array. In FFS this is done by newfs; however, the superblock 920 * in ext2fs doesn't have these variables, so we can calculate 921 * them here. 922 */ 923 e2fs_maxcontig = MAX(1, maxphys / ump->um_e2fs->e2fs_bsize); 924 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 925 ump->um_e2fs->e2fs_maxsymlinklen = EXT2_MAXSYMLINKLEN; 926 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 927 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 928 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 929 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 930 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 931 lp = ump->um_e2fs->e2fs_maxcluster; 932 sump = ump->um_e2fs->e2fs_clustersum; 933 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 934 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 935 sump->cs_init = 0; 936 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 937 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 938 } 939 } 940 941 brelse(bp); 942 bp = NULL; 943 fs = ump->um_e2fs; 944 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 945 946 /* 947 * If the fs is not mounted read-only, make sure the super block is 948 * always written back on a sync(). 949 */ 950 fs->e2fs_wasvalid = le16toh(fs->e2fs->e2fs_state) & E2FS_ISCLEAN ? 1 : 0; 951 if (ronly == 0) { 952 fs->e2fs_fmod = 1; /* mark it modified and set fs invalid */ 953 fs->e2fs->e2fs_state = 954 htole16(le16toh(fs->e2fs->e2fs_state) & ~E2FS_ISCLEAN); 955 } 956 mp->mnt_data = ump; 957 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 958 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 959 MNT_ILOCK(mp); 960 mp->mnt_flag |= MNT_LOCAL; 961 MNT_IUNLOCK(mp); 962 ump->um_mountp = mp; 963 ump->um_dev = dev; 964 ump->um_devvp = devvp; 965 ump->um_bo = &devvp->v_bufobj; 966 ump->um_cp = cp; 967 968 /* 969 * Setting those two parameters allowed us to use 970 * ufs_bmap w/o changse! 971 */ 972 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 973 ump->um_bptrtodb = le32toh(fs->e2fs->e2fs_log_bsize) + 1; 974 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 975 if (ronly == 0) 976 ext2_sbupdate(ump, MNT_WAIT); 977 /* 978 * Initialize filesystem stat information in mount struct. 979 */ 980 MNT_ILOCK(mp); 981 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 982 MNTK_USES_BCACHE; 983 MNT_IUNLOCK(mp); 984 return (0); 985 out: 986 if (bp) 987 brelse(bp); 988 if (cp != NULL) { 989 g_topology_lock(); 990 g_vfs_close(cp); 991 g_topology_unlock(); 992 } 993 if (ump) { 994 mtx_destroy(EXT2_MTX(ump)); 995 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 996 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 997 free(ump->um_e2fs->e2fs, M_EXT2MNT); 998 free(ump->um_e2fs, M_EXT2MNT); 999 free(ump, M_EXT2MNT); 1000 mp->mnt_data = NULL; 1001 } 1002 return (error); 1003 } 1004 1005 /* 1006 * Unmount system call. 1007 */ 1008 static int 1009 ext2_unmount(struct mount *mp, int mntflags) 1010 { 1011 struct ext2mount *ump; 1012 struct m_ext2fs *fs; 1013 struct csum *sump; 1014 int error, flags, i, ronly; 1015 1016 flags = 0; 1017 if (mntflags & MNT_FORCE) { 1018 if (mp->mnt_flag & MNT_ROOTFS) 1019 return (EINVAL); 1020 flags |= FORCECLOSE; 1021 } 1022 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 1023 return (error); 1024 ump = VFSTOEXT2(mp); 1025 fs = ump->um_e2fs; 1026 ronly = fs->e2fs_ronly; 1027 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 1028 if (fs->e2fs_wasvalid) 1029 fs->e2fs->e2fs_state = 1030 htole16(le16toh(fs->e2fs->e2fs_state) | E2FS_ISCLEAN); 1031 ext2_sbupdate(ump, MNT_WAIT); 1032 } 1033 1034 g_topology_lock(); 1035 g_vfs_close(ump->um_cp); 1036 g_topology_unlock(); 1037 vrele(ump->um_devvp); 1038 sump = fs->e2fs_clustersum; 1039 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 1040 free(sump->cs_sum, M_EXT2MNT); 1041 free(fs->e2fs_clustersum, M_EXT2MNT); 1042 free(fs->e2fs_maxcluster, M_EXT2MNT); 1043 free(fs->e2fs_gd, M_EXT2MNT); 1044 free(fs->e2fs_contigdirs, M_EXT2MNT); 1045 free(fs->e2fs, M_EXT2MNT); 1046 free(fs, M_EXT2MNT); 1047 free(ump, M_EXT2MNT); 1048 mp->mnt_data = NULL; 1049 return (error); 1050 } 1051 1052 /* 1053 * Flush out all the files in a filesystem. 1054 */ 1055 static int 1056 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 1057 { 1058 int error; 1059 1060 error = vflush(mp, 0, flags, td); 1061 return (error); 1062 } 1063 1064 /* 1065 * Get filesystem statistics. 1066 */ 1067 int 1068 ext2_statfs(struct mount *mp, struct statfs *sbp) 1069 { 1070 struct ext2mount *ump; 1071 struct m_ext2fs *fs; 1072 uint32_t overhead, overhead_per_group, ngdb; 1073 int i, ngroups; 1074 1075 ump = VFSTOEXT2(mp); 1076 fs = ump->um_e2fs; 1077 if (le16toh(fs->e2fs->e2fs_magic) != E2FS_MAGIC) 1078 panic("ext2_statfs"); 1079 1080 /* 1081 * Compute the overhead (FS structures) 1082 */ 1083 overhead_per_group = 1084 1 /* block bitmap */ + 1085 1 /* inode bitmap */ + 1086 fs->e2fs_itpg; 1087 overhead = le32toh(fs->e2fs->e2fs_first_dblock) + 1088 fs->e2fs_gcount * overhead_per_group; 1089 if (le32toh(fs->e2fs->e2fs_rev) > E2FS_REV0 && 1090 le32toh(fs->e2fs->e2fs_features_rocompat) & EXT2F_ROCOMPAT_SPARSESUPER) { 1091 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 1092 if (ext2_cg_has_sb(fs, i)) 1093 ngroups++; 1094 } 1095 } else { 1096 ngroups = fs->e2fs_gcount; 1097 } 1098 ngdb = fs->e2fs_gdbcount; 1099 if (le32toh(fs->e2fs->e2fs_rev) > E2FS_REV0 && 1100 le32toh(fs->e2fs->e2fs_features_compat) & EXT2F_COMPAT_RESIZE) 1101 ngdb += le16toh(fs->e2fs->e2fs_reserved_ngdb); 1102 overhead += ngroups * (1 /* superblock */ + ngdb); 1103 1104 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 1105 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 1106 sbp->f_blocks = fs->e2fs_bcount - overhead; 1107 sbp->f_bfree = fs->e2fs_fbcount; 1108 sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount; 1109 sbp->f_files = le32toh(fs->e2fs->e2fs_icount); 1110 sbp->f_ffree = fs->e2fs_ficount; 1111 return (0); 1112 } 1113 1114 /* 1115 * Go through the disk queues to initiate sandbagged IO; 1116 * go through the inodes to write those that have been modified; 1117 * initiate the writing of the super block if it has been modified. 1118 * 1119 * Note: we are always called with the filesystem marked `MPBUSY'. 1120 */ 1121 static int 1122 ext2_sync(struct mount *mp, int waitfor) 1123 { 1124 struct vnode *mvp, *vp; 1125 struct thread *td; 1126 struct inode *ip; 1127 struct ext2mount *ump = VFSTOEXT2(mp); 1128 struct m_ext2fs *fs; 1129 int error, allerror = 0; 1130 1131 td = curthread; 1132 fs = ump->um_e2fs; 1133 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 1134 panic("ext2_sync: rofs mod fs=%s", fs->e2fs_fsmnt); 1135 } 1136 1137 /* 1138 * Write back each (modified) inode. 1139 */ 1140 loop: 1141 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1142 if (vp->v_type == VNON) { 1143 VI_UNLOCK(vp); 1144 continue; 1145 } 1146 ip = VTOI(vp); 1147 if ((ip->i_flag & 1148 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 1149 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 1150 waitfor == MNT_LAZY)) { 1151 VI_UNLOCK(vp); 1152 continue; 1153 } 1154 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 1155 if (error) { 1156 if (error == ENOENT) { 1157 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1158 goto loop; 1159 } 1160 continue; 1161 } 1162 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 1163 allerror = error; 1164 vput(vp); 1165 } 1166 1167 /* 1168 * Force stale filesystem control information to be flushed. 1169 */ 1170 if (waitfor != MNT_LAZY) { 1171 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 1172 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 1173 allerror = error; 1174 VOP_UNLOCK(ump->um_devvp); 1175 } 1176 1177 /* 1178 * Write back modified superblock. 1179 */ 1180 if (fs->e2fs_fmod != 0) { 1181 fs->e2fs_fmod = 0; 1182 fs->e2fs->e2fs_wtime = htole32(time_second); 1183 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 1184 allerror = error; 1185 } 1186 return (allerror); 1187 } 1188 1189 /* 1190 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 1191 * in from disk. If it is in core, wait for the lock bit to clear, then 1192 * return the inode locked. Detection and handling of mount points must be 1193 * done by the calling routine. 1194 */ 1195 static int 1196 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 1197 { 1198 struct m_ext2fs *fs; 1199 struct inode *ip; 1200 struct ext2mount *ump; 1201 struct buf *bp; 1202 struct vnode *vp; 1203 struct thread *td; 1204 unsigned int i, used_blocks; 1205 int error; 1206 1207 td = curthread; 1208 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 1209 if (error || *vpp != NULL) 1210 return (error); 1211 1212 ump = VFSTOEXT2(mp); 1213 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 1214 1215 /* Allocate a new vnode/inode. */ 1216 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 1217 *vpp = NULL; 1218 free(ip, M_EXT2NODE); 1219 return (error); 1220 } 1221 vp->v_data = ip; 1222 ip->i_vnode = vp; 1223 ip->i_e2fs = fs = ump->um_e2fs; 1224 ip->i_ump = ump; 1225 ip->i_number = ino; 1226 cluster_init_vn(&ip->i_clusterw); 1227 1228 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 1229 error = insmntque(vp, mp); 1230 if (error != 0) { 1231 free(ip, M_EXT2NODE); 1232 *vpp = NULL; 1233 return (error); 1234 } 1235 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 1236 if (error || *vpp != NULL) 1237 return (error); 1238 1239 /* Read in the disk contents for the inode, copy into the inode. */ 1240 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 1241 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 1242 /* 1243 * The inode does not contain anything useful, so it would 1244 * be misleading to leave it on its hash chain. With mode 1245 * still zero, it will be unlinked and returned to the free 1246 * list by vput(). 1247 */ 1248 brelse(bp); 1249 vput(vp); 1250 *vpp = NULL; 1251 return (error); 1252 } 1253 /* convert ext2 inode to dinode */ 1254 error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 1255 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ino)), ip); 1256 if (error) { 1257 brelse(bp); 1258 vput(vp); 1259 *vpp = NULL; 1260 return (error); 1261 } 1262 ip->i_block_group = ino_to_cg(fs, ino); 1263 ip->i_next_alloc_block = 0; 1264 ip->i_next_alloc_goal = 0; 1265 1266 /* 1267 * Now we want to make sure that block pointers for unused 1268 * blocks are zeroed out - ext2_balloc depends on this 1269 * although for regular files and directories only 1270 * 1271 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 1272 * out because we could corrupt the extent tree. 1273 */ 1274 if (!(ip->i_flag & IN_E4EXTENTS) && 1275 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 1276 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 1277 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 1278 ip->i_db[i] = 0; 1279 } 1280 1281 bqrelse(bp); 1282 1283 #ifdef EXT2FS_PRINT_EXTENTS 1284 ext2_print_inode(ip); 1285 error = ext4_ext_walk(ip); 1286 if (error) { 1287 vput(vp); 1288 *vpp = NULL; 1289 return (error); 1290 } 1291 #endif 1292 1293 /* 1294 * Initialize the vnode from the inode, check for aliases. 1295 * Note that the underlying vnode may have changed. 1296 */ 1297 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 1298 vput(vp); 1299 *vpp = NULL; 1300 return (error); 1301 } 1302 1303 /* 1304 * Finish inode initialization. 1305 */ 1306 1307 vn_set_state(vp, VSTATE_CONSTRUCTED); 1308 *vpp = vp; 1309 return (0); 1310 } 1311 1312 /* 1313 * File handle to vnode 1314 * 1315 * Have to be really careful about stale file handles: 1316 * - check that the inode number is valid 1317 * - call ext2_vget() to get the locked inode 1318 * - check for an unallocated inode (i_mode == 0) 1319 * - check that the given client host has export rights and return 1320 * those rights via. exflagsp and credanonp 1321 */ 1322 static int 1323 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1324 { 1325 struct inode *ip; 1326 struct ufid *ufhp; 1327 struct vnode *nvp; 1328 struct m_ext2fs *fs; 1329 int error; 1330 1331 ufhp = (struct ufid *)fhp; 1332 fs = VFSTOEXT2(mp)->um_e2fs; 1333 if (ufhp->ufid_ino < EXT2_ROOTINO || 1334 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs_ipg) 1335 return (ESTALE); 1336 1337 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1338 if (error) { 1339 *vpp = NULLVP; 1340 return (error); 1341 } 1342 ip = VTOI(nvp); 1343 if (ip->i_mode == 0 || 1344 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1345 vput(nvp); 1346 *vpp = NULLVP; 1347 return (ESTALE); 1348 } 1349 *vpp = nvp; 1350 vnode_create_vobject(*vpp, 0, curthread); 1351 return (0); 1352 } 1353 1354 /* 1355 * Write a superblock and associated information back to disk. 1356 */ 1357 static int 1358 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1359 { 1360 struct m_ext2fs *fs = mp->um_e2fs; 1361 struct ext2fs *es = fs->e2fs; 1362 struct buf *bp; 1363 int error = 0; 1364 1365 es->e2fs_bcount = htole32(fs->e2fs_bcount & 0xffffffff); 1366 es->e2fs_rbcount = htole32(fs->e2fs_rbcount & 0xffffffff); 1367 es->e2fs_fbcount = htole32(fs->e2fs_fbcount & 0xffffffff); 1368 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1369 es->e4fs_bcount_hi = htole32(fs->e2fs_bcount >> 32); 1370 es->e4fs_rbcount_hi = htole32(fs->e2fs_rbcount >> 32); 1371 es->e4fs_fbcount_hi = htole32(fs->e2fs_fbcount >> 32); 1372 } 1373 1374 es->e2fs_ficount = htole32(fs->e2fs_ficount); 1375 1376 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1377 ext2_sb_csum_set(fs); 1378 1379 error = bread(mp->um_devvp, SBLOCK, SBLOCKBLKSIZE, NOCRED, &bp); 1380 if (error != 0) 1381 return (error); 1382 1383 memcpy((char *)bp->b_data + SBLOCKOFFSET, (caddr_t)es, 1384 (u_int)sizeof(struct ext2fs)); 1385 if (waitfor == MNT_WAIT) 1386 error = bwrite(bp); 1387 else 1388 bawrite(bp); 1389 1390 /* 1391 * The buffers for group descriptors, inode bitmaps and block bitmaps 1392 * are not busy at this point and are (hopefully) written by the 1393 * usual sync mechanism. No need to write them here. 1394 */ 1395 return (error); 1396 } 1397 int 1398 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1399 { 1400 struct m_ext2fs *fs = mp->um_e2fs; 1401 struct buf *bp; 1402 int i, j, g_count = 0, error = 0, allerror = 0; 1403 1404 allerror = ext2_sbupdate(mp, waitfor); 1405 1406 /* Update gd csums */ 1407 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) || 1408 EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) 1409 ext2_gd_csum_set(fs); 1410 1411 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1412 bp = getblk(mp->um_devvp, fsbtodb(fs, 1413 ext2_cg_location(fs, i)), 1414 fs->e2fs_bsize, 0, 0, 0); 1415 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) { 1416 memcpy(bp->b_data, &fs->e2fs_gd[ 1417 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1418 fs->e2fs_bsize); 1419 } else { 1420 for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE && 1421 g_count < fs->e2fs_gcount; j++, g_count++) 1422 memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE, 1423 &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE); 1424 } 1425 if (waitfor == MNT_WAIT) 1426 error = bwrite(bp); 1427 else 1428 bawrite(bp); 1429 } 1430 1431 if (!allerror && error) 1432 allerror = error; 1433 return (allerror); 1434 } 1435 1436 /* 1437 * Return the root of a filesystem. 1438 */ 1439 static int 1440 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1441 { 1442 struct vnode *nvp; 1443 int error; 1444 1445 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1446 if (error) 1447 return (error); 1448 *vpp = nvp; 1449 return (0); 1450 } 1451