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 * Copyright (c) 1989, 1991, 1993, 1994 9 * The Regents of the University of California. All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94 36 * $FreeBSD$ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/namei.h> 42 #include <sys/priv.h> 43 #include <sys/proc.h> 44 #include <sys/kernel.h> 45 #include <sys/vnode.h> 46 #include <sys/mount.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/conf.h> 50 #include <sys/endian.h> 51 #include <sys/fcntl.h> 52 #include <sys/malloc.h> 53 #include <sys/stat.h> 54 #include <sys/mutex.h> 55 56 #include <geom/geom.h> 57 #include <geom/geom_vfs.h> 58 59 #include <fs/ext2fs/ext2_mount.h> 60 #include <fs/ext2fs/inode.h> 61 62 #include <fs/ext2fs/fs.h> 63 #include <fs/ext2fs/ext2fs.h> 64 #include <fs/ext2fs/ext2_dinode.h> 65 #include <fs/ext2fs/ext2_extern.h> 66 67 static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td); 68 static int ext2_mountfs(struct vnode *, struct mount *); 69 static int ext2_reload(struct mount *mp, struct thread *td); 70 static int ext2_sbupdate(struct ext2mount *, int); 71 static int ext2_cgupdate(struct ext2mount *, int); 72 static vfs_unmount_t ext2_unmount; 73 static vfs_root_t ext2_root; 74 static vfs_statfs_t ext2_statfs; 75 static vfs_sync_t ext2_sync; 76 static vfs_vget_t ext2_vget; 77 static vfs_fhtovp_t ext2_fhtovp; 78 static vfs_mount_t ext2_mount; 79 80 MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part"); 81 static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure"); 82 83 static struct vfsops ext2fs_vfsops = { 84 .vfs_fhtovp = ext2_fhtovp, 85 .vfs_mount = ext2_mount, 86 .vfs_root = ext2_root, /* root inode via vget */ 87 .vfs_statfs = ext2_statfs, 88 .vfs_sync = ext2_sync, 89 .vfs_unmount = ext2_unmount, 90 .vfs_vget = ext2_vget, 91 }; 92 93 VFS_SET(ext2fs_vfsops, ext2fs, 0); 94 95 static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, 96 int ronly); 97 static int compute_sb_data(struct vnode * devvp, 98 struct ext2fs * es, struct m_ext2fs * fs); 99 100 static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr", 101 "noclusterw", "noexec", "export", "force", "from", "multilabel", 102 "suiddir", "nosymfollow", "sync", "union", NULL }; 103 104 /* 105 * VFS Operations. 106 * 107 * mount system call 108 */ 109 static int 110 ext2_mount(struct mount *mp) 111 { 112 struct vfsoptlist *opts; 113 struct vnode *devvp; 114 struct thread *td; 115 struct ext2mount *ump = NULL; 116 struct m_ext2fs *fs; 117 struct nameidata nd, *ndp = &nd; 118 accmode_t accmode; 119 char *path, *fspec; 120 int error, flags, len; 121 122 td = curthread; 123 opts = mp->mnt_optnew; 124 125 if (vfs_filteropt(opts, ext2_opts)) 126 return (EINVAL); 127 128 vfs_getopt(opts, "fspath", (void **)&path, NULL); 129 /* Double-check the length of path.. */ 130 if (strlen(path) >= MAXMNTLEN) 131 return (ENAMETOOLONG); 132 133 fspec = NULL; 134 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 135 if (!error && fspec[len - 1] != '\0') 136 return (EINVAL); 137 138 /* 139 * If updating, check whether changing from read-only to 140 * read/write; if there is no device name, that's all we do. 141 */ 142 if (mp->mnt_flag & MNT_UPDATE) { 143 ump = VFSTOEXT2(mp); 144 fs = ump->um_e2fs; 145 error = 0; 146 if (fs->e2fs_ronly == 0 && 147 vfs_flagopt(opts, "ro", NULL, 0)) { 148 error = VFS_SYNC(mp, MNT_WAIT); 149 if (error) 150 return (error); 151 flags = WRITECLOSE; 152 if (mp->mnt_flag & MNT_FORCE) 153 flags |= FORCECLOSE; 154 error = ext2_flushfiles(mp, flags, td); 155 if (error == 0 && fs->e2fs_wasvalid && ext2_cgupdate(ump, MNT_WAIT) == 0) { 156 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 157 ext2_sbupdate(ump, MNT_WAIT); 158 } 159 fs->e2fs_ronly = 1; 160 vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY); 161 g_topology_lock(); 162 g_access(ump->um_cp, 0, -1, 0); 163 g_topology_unlock(); 164 } 165 if (!error && (mp->mnt_flag & MNT_RELOAD)) 166 error = ext2_reload(mp, td); 167 if (error) 168 return (error); 169 devvp = ump->um_devvp; 170 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) { 171 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0)) 172 return (EPERM); 173 174 /* 175 * If upgrade to read-write by non-root, then verify 176 * that user has necessary permissions on the device. 177 */ 178 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 179 error = VOP_ACCESS(devvp, VREAD | VWRITE, 180 td->td_ucred, td); 181 if (error) 182 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 183 if (error) { 184 VOP_UNLOCK(devvp, 0); 185 return (error); 186 } 187 VOP_UNLOCK(devvp, 0); 188 g_topology_lock(); 189 error = g_access(ump->um_cp, 0, 1, 0); 190 g_topology_unlock(); 191 if (error) 192 return (error); 193 194 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 || 195 (fs->e2fs->e2fs_state & E2FS_ERRORS)) { 196 if (mp->mnt_flag & MNT_FORCE) { 197 printf( 198 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt); 199 } else { 200 printf( 201 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 202 fs->e2fs_fsmnt); 203 return (EPERM); 204 } 205 } 206 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; 207 (void)ext2_cgupdate(ump, MNT_WAIT); 208 fs->e2fs_ronly = 0; 209 MNT_ILOCK(mp); 210 mp->mnt_flag &= ~MNT_RDONLY; 211 MNT_IUNLOCK(mp); 212 } 213 if (vfs_flagopt(opts, "export", NULL, 0)) { 214 /* Process export requests in vfs_mount.c. */ 215 return (error); 216 } 217 } 218 219 /* 220 * Not an update, or updating the name: look up the name 221 * and verify that it refers to a sensible disk device. 222 */ 223 if (fspec == NULL) 224 return (EINVAL); 225 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 226 if ((error = namei(ndp)) != 0) 227 return (error); 228 NDFREE(ndp, NDF_ONLY_PNBUF); 229 devvp = ndp->ni_vp; 230 231 if (!vn_isdisk(devvp, &error)) { 232 vput(devvp); 233 return (error); 234 } 235 236 /* 237 * If mount by non-root, then verify that user has necessary 238 * permissions on the device. 239 * 240 * XXXRW: VOP_ACCESS() enough? 241 */ 242 accmode = VREAD; 243 if ((mp->mnt_flag & MNT_RDONLY) == 0) 244 accmode |= VWRITE; 245 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 246 if (error) 247 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 248 if (error) { 249 vput(devvp); 250 return (error); 251 } 252 253 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 254 error = ext2_mountfs(devvp, mp); 255 } else { 256 if (devvp != ump->um_devvp) { 257 vput(devvp); 258 return (EINVAL); /* needs translation */ 259 } else 260 vput(devvp); 261 } 262 if (error) { 263 vrele(devvp); 264 return (error); 265 } 266 ump = VFSTOEXT2(mp); 267 fs = ump->um_e2fs; 268 269 /* 270 * Note that this strncpy() is ok because of a check at the start 271 * of ext2_mount(). 272 */ 273 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN); 274 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0'; 275 vfs_mountedfrom(mp, fspec); 276 return (0); 277 } 278 279 static int 280 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly) 281 { 282 283 if (es->e2fs_magic != E2FS_MAGIC) { 284 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 285 devtoname(dev), es->e2fs_magic, E2FS_MAGIC); 286 return (1); 287 } 288 if (es->e2fs_rev > E2FS_REV0) { 289 if (es->e2fs_features_incompat & ~(EXT2F_INCOMPAT_SUPP | 290 EXT4F_RO_INCOMPAT_SUPP)) { 291 printf( 292 "WARNING: mount of %s denied due to unsupported optional features\n", 293 devtoname(dev)); 294 return (1); 295 } 296 if (!ronly && 297 (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) { 298 printf("WARNING: R/W mount of %s denied due to " 299 "unsupported optional features\n", devtoname(dev)); 300 return (1); 301 } 302 } 303 return (0); 304 } 305 306 /* 307 * This computes the fields of the m_ext2fs structure from the 308 * data in the ext2fs structure read in. 309 */ 310 static int 311 compute_sb_data(struct vnode *devvp, struct ext2fs *es, 312 struct m_ext2fs *fs) 313 { 314 int db_count, error; 315 int i; 316 int logic_sb_block = 1; /* XXX for now */ 317 struct buf *bp; 318 uint32_t e2fs_descpb; 319 320 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 321 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 322 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 323 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 324 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 325 if (fs->e2fs_fsize) 326 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 327 fs->e2fs_bpg = es->e2fs_bpg; 328 fs->e2fs_fpg = es->e2fs_fpg; 329 fs->e2fs_ipg = es->e2fs_ipg; 330 if (es->e2fs_rev == E2FS_REV0) { 331 fs->e2fs_isize = E2FS_REV0_INODE_SIZE; 332 } else { 333 fs->e2fs_isize = es->e2fs_inode_size; 334 335 /* 336 * Simple sanity check for superblock inode size value. 337 */ 338 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 339 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 340 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 341 printf("ext2fs: invalid inode size %d\n", 342 fs->e2fs_isize); 343 return (EIO); 344 } 345 } 346 /* Check for extra isize in big inodes. */ 347 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 348 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 349 printf("ext2fs: no space for extra inode timestamps\n"); 350 return (EINVAL); 351 } 352 /* Check for group descriptor size */ 353 if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) && 354 (es->e3fs_desc_size != sizeof(struct ext2_gd))) { 355 printf("ext2fs: group descriptor size unsupported %d\n", 356 es->e3fs_desc_size); 357 return (EINVAL); 358 } 359 360 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 361 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 362 /* s_resuid / s_resgid ? */ 363 fs->e2fs_gcount = howmany(es->e2fs_bcount - es->e2fs_first_dblock, 364 EXT2_BLOCKS_PER_GROUP(fs)); 365 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 366 db_count = howmany(fs->e2fs_gcount, e2fs_descpb); 367 fs->e2fs_gdbcount = db_count; 368 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize, 369 M_EXT2MNT, M_WAITOK); 370 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 371 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 372 373 /* 374 * Adjust logic_sb_block. 375 * Godmar thinks: if the blocksize is greater than 1024, then 376 * the superblock is logically part of block zero. 377 */ 378 if (fs->e2fs_bsize > SBSIZE) 379 logic_sb_block = 0; 380 for (i = 0; i < db_count; i++) { 381 error = bread(devvp, 382 fsbtodb(fs, logic_sb_block + i + 1), 383 fs->e2fs_bsize, NOCRED, &bp); 384 if (error) { 385 free(fs->e2fs_contigdirs, M_EXT2MNT); 386 free(fs->e2fs_gd, M_EXT2MNT); 387 brelse(bp); 388 return (error); 389 } 390 e2fs_cgload((struct ext2_gd *)bp->b_data, 391 &fs->e2fs_gd[ 392 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 393 fs->e2fs_bsize); 394 brelse(bp); 395 bp = NULL; 396 } 397 /* Verify cg csum */ 398 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM)) { 399 error = ext2_gd_csum_verify(fs, devvp->v_rdev); 400 if (error) 401 return (error); 402 } 403 /* Initialization for the ext2 Orlov allocator variant. */ 404 fs->e2fs_total_dir = 0; 405 for (i = 0; i < fs->e2fs_gcount; i++) 406 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs; 407 408 if (es->e2fs_rev == E2FS_REV0 || 409 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 410 fs->e2fs_maxfilesize = 0x7fffffff; 411 else { 412 fs->e2fs_maxfilesize = 0xffffffffffff; 413 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 414 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 415 } 416 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) { 417 fs->e2fs_uhash = 3; 418 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) { 419 #ifdef __CHAR_UNSIGNED__ 420 es->e4fs_flags |= E2FS_UNSIGNED_HASH; 421 fs->e2fs_uhash = 3; 422 #else 423 es->e4fs_flags |= E2FS_SIGNED_HASH; 424 #endif 425 } 426 427 return (0); 428 } 429 430 /* 431 * Reload all incore data for a filesystem (used after running fsck on 432 * the root filesystem and finding things to fix). The filesystem must 433 * be mounted read-only. 434 * 435 * Things to do to update the mount: 436 * 1) invalidate all cached meta-data. 437 * 2) re-read superblock from disk. 438 * 3) invalidate all cluster summary information. 439 * 4) invalidate all inactive vnodes. 440 * 5) invalidate all cached file data. 441 * 6) re-read inode data for all active vnodes. 442 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 443 */ 444 static int 445 ext2_reload(struct mount *mp, struct thread *td) 446 { 447 struct vnode *vp, *mvp, *devvp; 448 struct inode *ip; 449 struct buf *bp; 450 struct ext2fs *es; 451 struct m_ext2fs *fs; 452 struct csum *sump; 453 int error, i; 454 int32_t *lp; 455 456 if ((mp->mnt_flag & MNT_RDONLY) == 0) 457 return (EINVAL); 458 /* 459 * Step 1: invalidate all cached meta-data. 460 */ 461 devvp = VFSTOEXT2(mp)->um_devvp; 462 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 463 if (vinvalbuf(devvp, 0, 0, 0) != 0) 464 panic("ext2_reload: dirty1"); 465 VOP_UNLOCK(devvp, 0); 466 467 /* 468 * Step 2: re-read superblock from disk. 469 * constants have been adjusted for ext2 470 */ 471 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 472 return (error); 473 es = (struct ext2fs *)bp->b_data; 474 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 475 brelse(bp); 476 return (EIO); /* XXX needs translation */ 477 } 478 fs = VFSTOEXT2(mp)->um_e2fs; 479 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 480 481 if ((error = compute_sb_data(devvp, es, fs)) != 0) { 482 brelse(bp); 483 return (error); 484 } 485 #ifdef UNKLAR 486 if (fs->fs_sbsize < SBSIZE) 487 bp->b_flags |= B_INVAL; 488 #endif 489 brelse(bp); 490 491 /* 492 * Step 3: invalidate all cluster summary information. 493 */ 494 if (fs->e2fs_contigsumsize > 0) { 495 lp = fs->e2fs_maxcluster; 496 sump = fs->e2fs_clustersum; 497 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 498 *lp++ = fs->e2fs_contigsumsize; 499 sump->cs_init = 0; 500 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 501 } 502 } 503 504 loop: 505 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 506 /* 507 * Step 4: invalidate all cached file data. 508 */ 509 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 510 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 511 goto loop; 512 } 513 if (vinvalbuf(vp, 0, 0, 0)) 514 panic("ext2_reload: dirty2"); 515 516 /* 517 * Step 5: re-read inode data for all active vnodes. 518 */ 519 ip = VTOI(vp); 520 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 521 (int)fs->e2fs_bsize, NOCRED, &bp); 522 if (error) { 523 VOP_UNLOCK(vp, 0); 524 vrele(vp); 525 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 526 return (error); 527 } 528 ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + 529 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 530 brelse(bp); 531 VOP_UNLOCK(vp, 0); 532 vrele(vp); 533 } 534 return (0); 535 } 536 537 /* 538 * Common code for mount and mountroot. 539 */ 540 static int 541 ext2_mountfs(struct vnode *devvp, struct mount *mp) 542 { 543 struct ext2mount *ump; 544 struct buf *bp; 545 struct m_ext2fs *fs; 546 struct ext2fs *es; 547 struct cdev *dev = devvp->v_rdev; 548 struct g_consumer *cp; 549 struct bufobj *bo; 550 struct csum *sump; 551 int error; 552 int ronly; 553 int i; 554 u_long size; 555 int32_t *lp; 556 int32_t e2fs_maxcontig; 557 558 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 559 /* XXX: use VOP_ACESS to check FS perms */ 560 g_topology_lock(); 561 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 562 g_topology_unlock(); 563 VOP_UNLOCK(devvp, 0); 564 if (error) 565 return (error); 566 567 /* XXX: should we check for some sectorsize or 512 instead? */ 568 if (((SBSIZE % cp->provider->sectorsize) != 0) || 569 (SBSIZE < cp->provider->sectorsize)) { 570 g_topology_lock(); 571 g_vfs_close(cp); 572 g_topology_unlock(); 573 return (EINVAL); 574 } 575 576 bo = &devvp->v_bufobj; 577 bo->bo_private = cp; 578 bo->bo_ops = g_vfs_bufops; 579 if (devvp->v_rdev->si_iosize_max != 0) 580 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 581 if (mp->mnt_iosize_max > MAXPHYS) 582 mp->mnt_iosize_max = MAXPHYS; 583 584 bp = NULL; 585 ump = NULL; 586 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 587 goto out; 588 es = (struct ext2fs *)bp->b_data; 589 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 590 error = EINVAL; /* XXX needs translation */ 591 goto out; 592 } 593 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 594 (es->e2fs_state & E2FS_ERRORS)) { 595 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 596 printf( 597 "WARNING: Filesystem was not properly dismounted\n"); 598 } else { 599 printf( 600 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 601 error = EPERM; 602 goto out; 603 } 604 } 605 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 606 607 /* 608 * I don't know whether this is the right strategy. Note that 609 * we dynamically allocate both an m_ext2fs and an ext2fs 610 * while Linux keeps the super block in a locked buffer. 611 */ 612 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 613 M_EXT2MNT, M_WAITOK | M_ZERO); 614 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 615 M_EXT2MNT, M_WAITOK); 616 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 617 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 618 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 619 goto out; 620 621 /* 622 * Calculate the maximum contiguous blocks and size of cluster summary 623 * array. In FFS this is done by newfs; however, the superblock 624 * in ext2fs doesn't have these variables, so we can calculate 625 * them here. 626 */ 627 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 628 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 629 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 630 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 631 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 632 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 633 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 634 lp = ump->um_e2fs->e2fs_maxcluster; 635 sump = ump->um_e2fs->e2fs_clustersum; 636 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 637 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 638 sump->cs_init = 0; 639 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 640 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 641 } 642 } 643 644 brelse(bp); 645 bp = NULL; 646 fs = ump->um_e2fs; 647 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 648 649 /* 650 * If the fs is not mounted read-only, make sure the super block is 651 * always written back on a sync(). 652 */ 653 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 654 if (ronly == 0) { 655 fs->e2fs_fmod = 1; /* mark it modified */ 656 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 657 } 658 mp->mnt_data = ump; 659 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 660 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 661 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 662 MNT_ILOCK(mp); 663 mp->mnt_flag |= MNT_LOCAL; 664 MNT_IUNLOCK(mp); 665 ump->um_mountp = mp; 666 ump->um_dev = dev; 667 ump->um_devvp = devvp; 668 ump->um_bo = &devvp->v_bufobj; 669 ump->um_cp = cp; 670 671 /* 672 * Setting those two parameters allowed us to use 673 * ufs_bmap w/o changse! 674 */ 675 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 676 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 677 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 678 if (ronly == 0) 679 ext2_sbupdate(ump, MNT_WAIT); 680 /* 681 * Initialize filesystem stat information in mount struct. 682 */ 683 MNT_ILOCK(mp); 684 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 685 MNTK_USES_BCACHE; 686 MNT_IUNLOCK(mp); 687 return (0); 688 out: 689 if (bp) 690 brelse(bp); 691 if (cp != NULL) { 692 g_topology_lock(); 693 g_vfs_close(cp); 694 g_topology_unlock(); 695 } 696 if (ump) { 697 mtx_destroy(EXT2_MTX(ump)); 698 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 699 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 700 free(ump->um_e2fs->e2fs, M_EXT2MNT); 701 free(ump->um_e2fs, M_EXT2MNT); 702 free(ump, M_EXT2MNT); 703 mp->mnt_data = NULL; 704 } 705 return (error); 706 } 707 708 /* 709 * Unmount system call. 710 */ 711 static int 712 ext2_unmount(struct mount *mp, int mntflags) 713 { 714 struct ext2mount *ump; 715 struct m_ext2fs *fs; 716 struct csum *sump; 717 int error, flags, i, ronly; 718 719 flags = 0; 720 if (mntflags & MNT_FORCE) { 721 if (mp->mnt_flag & MNT_ROOTFS) 722 return (EINVAL); 723 flags |= FORCECLOSE; 724 } 725 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 726 return (error); 727 ump = VFSTOEXT2(mp); 728 fs = ump->um_e2fs; 729 ronly = fs->e2fs_ronly; 730 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 731 if (fs->e2fs_wasvalid) 732 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 733 ext2_sbupdate(ump, MNT_WAIT); 734 } 735 736 g_topology_lock(); 737 g_vfs_close(ump->um_cp); 738 g_topology_unlock(); 739 vrele(ump->um_devvp); 740 sump = fs->e2fs_clustersum; 741 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 742 free(sump->cs_sum, M_EXT2MNT); 743 free(fs->e2fs_clustersum, M_EXT2MNT); 744 free(fs->e2fs_maxcluster, M_EXT2MNT); 745 free(fs->e2fs_gd, M_EXT2MNT); 746 free(fs->e2fs_contigdirs, M_EXT2MNT); 747 free(fs->e2fs, M_EXT2MNT); 748 free(fs, M_EXT2MNT); 749 free(ump, M_EXT2MNT); 750 mp->mnt_data = NULL; 751 MNT_ILOCK(mp); 752 mp->mnt_flag &= ~MNT_LOCAL; 753 MNT_IUNLOCK(mp); 754 return (error); 755 } 756 757 /* 758 * Flush out all the files in a filesystem. 759 */ 760 static int 761 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 762 { 763 int error; 764 765 error = vflush(mp, 0, flags, td); 766 return (error); 767 } 768 769 /* 770 * Get filesystem statistics. 771 */ 772 int 773 ext2_statfs(struct mount *mp, struct statfs *sbp) 774 { 775 struct ext2mount *ump; 776 struct m_ext2fs *fs; 777 uint32_t overhead, overhead_per_group, ngdb; 778 int i, ngroups; 779 780 ump = VFSTOEXT2(mp); 781 fs = ump->um_e2fs; 782 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 783 panic("ext2_statfs"); 784 785 /* 786 * Compute the overhead (FS structures) 787 */ 788 overhead_per_group = 789 1 /* block bitmap */ + 790 1 /* inode bitmap */ + 791 fs->e2fs_itpg; 792 overhead = fs->e2fs->e2fs_first_dblock + 793 fs->e2fs_gcount * overhead_per_group; 794 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 795 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 796 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 797 if (ext2_cg_has_sb(fs, i)) 798 ngroups++; 799 } 800 } else { 801 ngroups = fs->e2fs_gcount; 802 } 803 ngdb = fs->e2fs_gdbcount; 804 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 805 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 806 ngdb += fs->e2fs->e2fs_reserved_ngdb; 807 overhead += ngroups * (1 /* superblock */ + ngdb); 808 809 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 810 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 811 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 812 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 813 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 814 sbp->f_files = fs->e2fs->e2fs_icount; 815 sbp->f_ffree = fs->e2fs->e2fs_ficount; 816 return (0); 817 } 818 819 /* 820 * Go through the disk queues to initiate sandbagged IO; 821 * go through the inodes to write those that have been modified; 822 * initiate the writing of the super block if it has been modified. 823 * 824 * Note: we are always called with the filesystem marked `MPBUSY'. 825 */ 826 static int 827 ext2_sync(struct mount *mp, int waitfor) 828 { 829 struct vnode *mvp, *vp; 830 struct thread *td; 831 struct inode *ip; 832 struct ext2mount *ump = VFSTOEXT2(mp); 833 struct m_ext2fs *fs; 834 int error, allerror = 0; 835 836 td = curthread; 837 fs = ump->um_e2fs; 838 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 839 printf("fs = %s\n", fs->e2fs_fsmnt); 840 panic("ext2_sync: rofs mod"); 841 } 842 843 /* 844 * Write back each (modified) inode. 845 */ 846 loop: 847 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 848 if (vp->v_type == VNON) { 849 VI_UNLOCK(vp); 850 continue; 851 } 852 ip = VTOI(vp); 853 if ((ip->i_flag & 854 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 855 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 856 waitfor == MNT_LAZY)) { 857 VI_UNLOCK(vp); 858 continue; 859 } 860 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 861 if (error) { 862 if (error == ENOENT) { 863 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 864 goto loop; 865 } 866 continue; 867 } 868 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 869 allerror = error; 870 VOP_UNLOCK(vp, 0); 871 vrele(vp); 872 } 873 874 /* 875 * Force stale filesystem control information to be flushed. 876 */ 877 if (waitfor != MNT_LAZY) { 878 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 879 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 880 allerror = error; 881 VOP_UNLOCK(ump->um_devvp, 0); 882 } 883 884 /* 885 * Write back modified superblock. 886 */ 887 if (fs->e2fs_fmod != 0) { 888 fs->e2fs_fmod = 0; 889 fs->e2fs->e2fs_wtime = time_second; 890 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 891 allerror = error; 892 } 893 return (allerror); 894 } 895 896 /* 897 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 898 * in from disk. If it is in core, wait for the lock bit to clear, then 899 * return the inode locked. Detection and handling of mount points must be 900 * done by the calling routine. 901 */ 902 static int 903 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 904 { 905 struct m_ext2fs *fs; 906 struct inode *ip; 907 struct ext2mount *ump; 908 struct buf *bp; 909 struct vnode *vp; 910 struct thread *td; 911 int i, error; 912 int used_blocks; 913 914 td = curthread; 915 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 916 if (error || *vpp != NULL) 917 return (error); 918 919 ump = VFSTOEXT2(mp); 920 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 921 922 /* Allocate a new vnode/inode. */ 923 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 924 *vpp = NULL; 925 free(ip, M_EXT2NODE); 926 return (error); 927 } 928 vp->v_data = ip; 929 ip->i_vnode = vp; 930 ip->i_e2fs = fs = ump->um_e2fs; 931 ip->i_ump = ump; 932 ip->i_number = ino; 933 934 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 935 error = insmntque(vp, mp); 936 if (error != 0) { 937 free(ip, M_EXT2NODE); 938 *vpp = NULL; 939 return (error); 940 } 941 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 942 if (error || *vpp != NULL) 943 return (error); 944 945 /* Read in the disk contents for the inode, copy into the inode. */ 946 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 947 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 948 /* 949 * The inode does not contain anything useful, so it would 950 * be misleading to leave it on its hash chain. With mode 951 * still zero, it will be unlinked and returned to the free 952 * list by vput(). 953 */ 954 brelse(bp); 955 vput(vp); 956 *vpp = NULL; 957 return (error); 958 } 959 /* convert ext2 inode to dinode */ 960 ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 961 ino_to_fsbo(fs, ino)), ip); 962 ip->i_block_group = ino_to_cg(fs, ino); 963 ip->i_next_alloc_block = 0; 964 ip->i_next_alloc_goal = 0; 965 966 /* 967 * Now we want to make sure that block pointers for unused 968 * blocks are zeroed out - ext2_balloc depends on this 969 * although for regular files and directories only 970 * 971 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 972 * out because we could corrupt the extent tree. 973 */ 974 if (!(ip->i_flag & IN_E4EXTENTS) && 975 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 976 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 977 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 978 ip->i_db[i] = 0; 979 } 980 #ifdef EXT2FS_DEBUG 981 ext2_print_inode(ip); 982 #endif 983 bqrelse(bp); 984 985 /* 986 * Initialize the vnode from the inode, check for aliases. 987 * Note that the underlying vnode may have changed. 988 */ 989 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 990 vput(vp); 991 *vpp = NULL; 992 return (error); 993 } 994 995 /* 996 * Finish inode initialization. 997 */ 998 999 *vpp = vp; 1000 return (0); 1001 } 1002 1003 /* 1004 * File handle to vnode 1005 * 1006 * Have to be really careful about stale file handles: 1007 * - check that the inode number is valid 1008 * - call ext2_vget() to get the locked inode 1009 * - check for an unallocated inode (i_mode == 0) 1010 * - check that the given client host has export rights and return 1011 * those rights via. exflagsp and credanonp 1012 */ 1013 static int 1014 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1015 { 1016 struct inode *ip; 1017 struct ufid *ufhp; 1018 struct vnode *nvp; 1019 struct m_ext2fs *fs; 1020 int error; 1021 1022 ufhp = (struct ufid *)fhp; 1023 fs = VFSTOEXT2(mp)->um_e2fs; 1024 if (ufhp->ufid_ino < EXT2_ROOTINO || 1025 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1026 return (ESTALE); 1027 1028 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1029 if (error) { 1030 *vpp = NULLVP; 1031 return (error); 1032 } 1033 ip = VTOI(nvp); 1034 if (ip->i_mode == 0 || 1035 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1036 vput(nvp); 1037 *vpp = NULLVP; 1038 return (ESTALE); 1039 } 1040 *vpp = nvp; 1041 vnode_create_vobject(*vpp, 0, curthread); 1042 return (0); 1043 } 1044 1045 /* 1046 * Write a superblock and associated information back to disk. 1047 */ 1048 static int 1049 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1050 { 1051 struct m_ext2fs *fs = mp->um_e2fs; 1052 struct ext2fs *es = fs->e2fs; 1053 struct buf *bp; 1054 int error = 0; 1055 1056 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1057 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1058 if (waitfor == MNT_WAIT) 1059 error = bwrite(bp); 1060 else 1061 bawrite(bp); 1062 1063 /* 1064 * The buffers for group descriptors, inode bitmaps and block bitmaps 1065 * are not busy at this point and are (hopefully) written by the 1066 * usual sync mechanism. No need to write them here. 1067 */ 1068 return (error); 1069 } 1070 int 1071 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1072 { 1073 struct m_ext2fs *fs = mp->um_e2fs; 1074 struct buf *bp; 1075 int i, error = 0, allerror = 0; 1076 1077 allerror = ext2_sbupdate(mp, waitfor); 1078 1079 /* Update gd csums */ 1080 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM)) 1081 ext2_gd_csum_set(fs); 1082 1083 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1084 bp = getblk(mp->um_devvp, fsbtodb(fs, 1085 fs->e2fs->e2fs_first_dblock + 1086 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1087 e2fs_cgsave(&fs->e2fs_gd[ 1088 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1089 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1090 if (waitfor == MNT_WAIT) 1091 error = bwrite(bp); 1092 else 1093 bawrite(bp); 1094 } 1095 1096 if (!allerror && error) 1097 allerror = error; 1098 return (allerror); 1099 } 1100 1101 /* 1102 * Return the root of a filesystem. 1103 */ 1104 static int 1105 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1106 { 1107 struct vnode *nvp; 1108 int error; 1109 1110 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1111 if (error) 1112 return (error); 1113 *vpp = nvp; 1114 return (0); 1115 } 1116