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sys/fs/ext2fs/ext2_vfsops.c
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1 /*- 2 * modified for EXT2FS support in Lites 1.1 3 * 4 * Aug 1995, Godmar Back (gback@cs.utah.edu) 5 * University of Utah, Department of Computer Science 6 */ 7 /*- 8 * 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 * 4. 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: releng/11.0/sys/fs/ext2fs/ext2_vfsops.c 301569 2016-06-07 21:40:42Z pfg $ 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 } 352 353 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 354 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 355 /* s_resuid / s_resgid ? */ 356 fs->e2fs_gcount = howmany(es->e2fs_bcount - es->e2fs_first_dblock, 357 EXT2_BLOCKS_PER_GROUP(fs)); 358 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 359 db_count = howmany(fs->e2fs_gcount, e2fs_descpb); 360 fs->e2fs_gdbcount = db_count; 361 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize, 362 M_EXT2MNT, M_WAITOK); 363 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 364 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 365 366 /* 367 * Adjust logic_sb_block. 368 * Godmar thinks: if the blocksize is greater than 1024, then 369 * the superblock is logically part of block zero. 370 */ 371 if(fs->e2fs_bsize > SBSIZE) 372 logic_sb_block = 0; 373 for (i = 0; i < db_count; i++) { 374 error = bread(devvp , 375 fsbtodb(fs, logic_sb_block + i + 1 ), 376 fs->e2fs_bsize, NOCRED, &bp); 377 if (error) { 378 free(fs->e2fs_contigdirs, M_EXT2MNT); 379 free(fs->e2fs_gd, M_EXT2MNT); 380 brelse(bp); 381 return (error); 382 } 383 e2fs_cgload((struct ext2_gd *)bp->b_data, 384 &fs->e2fs_gd[ 385 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 386 fs->e2fs_bsize); 387 brelse(bp); 388 bp = NULL; 389 } 390 /* Initialization for the ext2 Orlov allocator variant. */ 391 fs->e2fs_total_dir = 0; 392 for (i = 0; i < fs->e2fs_gcount; i++) 393 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs; 394 395 if (es->e2fs_rev == E2FS_REV0 || 396 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 397 fs->e2fs_maxfilesize = 0x7fffffff; 398 else { 399 fs->e2fs_maxfilesize = 0xffffffffffff; 400 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE)) 401 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 402 } 403 if (es->e4fs_flags & E2FS_UNSIGNED_HASH) { 404 fs->e2fs_uhash = 3; 405 } else if ((es->e4fs_flags & E2FS_SIGNED_HASH) == 0) { 406 #ifdef __CHAR_UNSIGNED__ 407 es->e4fs_flags |= E2FS_UNSIGNED_HASH; 408 fs->e2fs_uhash = 3; 409 #else 410 es->e4fs_flags |= E2FS_SIGNED_HASH; 411 #endif 412 } 413 414 return (0); 415 } 416 417 /* 418 * Reload all incore data for a filesystem (used after running fsck on 419 * the root filesystem and finding things to fix). The filesystem must 420 * be mounted read-only. 421 * 422 * Things to do to update the mount: 423 * 1) invalidate all cached meta-data. 424 * 2) re-read superblock from disk. 425 * 3) invalidate all cluster summary information. 426 * 4) invalidate all inactive vnodes. 427 * 5) invalidate all cached file data. 428 * 6) re-read inode data for all active vnodes. 429 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 430 */ 431 static int 432 ext2_reload(struct mount *mp, struct thread *td) 433 { 434 struct vnode *vp, *mvp, *devvp; 435 struct inode *ip; 436 struct buf *bp; 437 struct ext2fs *es; 438 struct m_ext2fs *fs; 439 struct csum *sump; 440 int error, i; 441 int32_t *lp; 442 443 if ((mp->mnt_flag & MNT_RDONLY) == 0) 444 return (EINVAL); 445 /* 446 * Step 1: invalidate all cached meta-data. 447 */ 448 devvp = VFSTOEXT2(mp)->um_devvp; 449 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 450 if (vinvalbuf(devvp, 0, 0, 0) != 0) 451 panic("ext2_reload: dirty1"); 452 VOP_UNLOCK(devvp, 0); 453 454 /* 455 * Step 2: re-read superblock from disk. 456 * constants have been adjusted for ext2 457 */ 458 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 459 return (error); 460 es = (struct ext2fs *)bp->b_data; 461 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 462 brelse(bp); 463 return (EIO); /* XXX needs translation */ 464 } 465 fs = VFSTOEXT2(mp)->um_e2fs; 466 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 467 468 if((error = compute_sb_data(devvp, es, fs)) != 0) { 469 brelse(bp); 470 return (error); 471 } 472 #ifdef UNKLAR 473 if (fs->fs_sbsize < SBSIZE) 474 bp->b_flags |= B_INVAL; 475 #endif 476 brelse(bp); 477 478 /* 479 * Step 3: invalidate all cluster summary information. 480 */ 481 if (fs->e2fs_contigsumsize > 0) { 482 lp = fs->e2fs_maxcluster; 483 sump = fs->e2fs_clustersum; 484 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 485 *lp++ = fs->e2fs_contigsumsize; 486 sump->cs_init = 0; 487 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 488 } 489 } 490 491 loop: 492 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 493 /* 494 * Step 4: invalidate all cached file data. 495 */ 496 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 497 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 498 goto loop; 499 } 500 if (vinvalbuf(vp, 0, 0, 0)) 501 panic("ext2_reload: dirty2"); 502 503 /* 504 * Step 5: re-read inode data for all active vnodes. 505 */ 506 ip = VTOI(vp); 507 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 508 (int)fs->e2fs_bsize, NOCRED, &bp); 509 if (error) { 510 VOP_UNLOCK(vp, 0); 511 vrele(vp); 512 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 513 return (error); 514 } 515 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + 516 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 517 brelse(bp); 518 VOP_UNLOCK(vp, 0); 519 vrele(vp); 520 } 521 return (0); 522 } 523 524 /* 525 * Common code for mount and mountroot. 526 */ 527 static int 528 ext2_mountfs(struct vnode *devvp, struct mount *mp) 529 { 530 struct ext2mount *ump; 531 struct buf *bp; 532 struct m_ext2fs *fs; 533 struct ext2fs *es; 534 struct cdev *dev = devvp->v_rdev; 535 struct g_consumer *cp; 536 struct bufobj *bo; 537 struct csum *sump; 538 int error; 539 int ronly; 540 int i, size; 541 int32_t *lp; 542 int32_t e2fs_maxcontig; 543 544 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 545 /* XXX: use VOP_ACESS to check FS perms */ 546 g_topology_lock(); 547 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 548 g_topology_unlock(); 549 VOP_UNLOCK(devvp, 0); 550 if (error) 551 return (error); 552 553 /* XXX: should we check for some sectorsize or 512 instead? */ 554 if (((SBSIZE % cp->provider->sectorsize) != 0) || 555 (SBSIZE < cp->provider->sectorsize)) { 556 g_topology_lock(); 557 g_vfs_close(cp); 558 g_topology_unlock(); 559 return (EINVAL); 560 } 561 562 bo = &devvp->v_bufobj; 563 bo->bo_private = cp; 564 bo->bo_ops = g_vfs_bufops; 565 if (devvp->v_rdev->si_iosize_max != 0) 566 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 567 if (mp->mnt_iosize_max > MAXPHYS) 568 mp->mnt_iosize_max = MAXPHYS; 569 570 bp = NULL; 571 ump = NULL; 572 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 573 goto out; 574 es = (struct ext2fs *)bp->b_data; 575 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 576 error = EINVAL; /* XXX needs translation */ 577 goto out; 578 } 579 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 580 (es->e2fs_state & E2FS_ERRORS)) { 581 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 582 printf( 583 "WARNING: Filesystem was not properly dismounted\n"); 584 } else { 585 printf( 586 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 587 error = EPERM; 588 goto out; 589 } 590 } 591 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 592 593 /* 594 * I don't know whether this is the right strategy. Note that 595 * we dynamically allocate both an m_ext2fs and an ext2fs 596 * while Linux keeps the super block in a locked buffer. 597 */ 598 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 599 M_EXT2MNT, M_WAITOK | M_ZERO); 600 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 601 M_EXT2MNT, M_WAITOK); 602 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 603 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 604 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 605 goto out; 606 607 /* 608 * Calculate the maximum contiguous blocks and size of cluster summary 609 * array. In FFS this is done by newfs; however, the superblock 610 * in ext2fs doesn't have these variables, so we can calculate 611 * them here. 612 */ 613 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 614 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 615 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 616 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 617 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 618 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 619 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 620 lp = ump->um_e2fs->e2fs_maxcluster; 621 sump = ump->um_e2fs->e2fs_clustersum; 622 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 623 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 624 sump->cs_init = 0; 625 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 626 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 627 } 628 } 629 630 brelse(bp); 631 bp = NULL; 632 fs = ump->um_e2fs; 633 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 634 635 /* 636 * If the fs is not mounted read-only, make sure the super block is 637 * always written back on a sync(). 638 */ 639 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 640 if (ronly == 0) { 641 fs->e2fs_fmod = 1; /* mark it modified */ 642 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 643 } 644 mp->mnt_data = ump; 645 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 646 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 647 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 648 MNT_ILOCK(mp); 649 mp->mnt_flag |= MNT_LOCAL; 650 MNT_IUNLOCK(mp); 651 ump->um_mountp = mp; 652 ump->um_dev = dev; 653 ump->um_devvp = devvp; 654 ump->um_bo = &devvp->v_bufobj; 655 ump->um_cp = cp; 656 657 /* 658 * Setting those two parameters allowed us to use 659 * ufs_bmap w/o changse! 660 */ 661 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 662 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 663 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 664 if (ronly == 0) 665 ext2_sbupdate(ump, MNT_WAIT); 666 /* 667 * Initialize filesystem stat information in mount struct. 668 */ 669 MNT_ILOCK(mp); 670 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 671 MNTK_USES_BCACHE; 672 MNT_IUNLOCK(mp); 673 return (0); 674 out: 675 if (bp) 676 brelse(bp); 677 if (cp != NULL) { 678 g_topology_lock(); 679 g_vfs_close(cp); 680 g_topology_unlock(); 681 } 682 if (ump) { 683 mtx_destroy(EXT2_MTX(ump)); 684 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 685 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 686 free(ump->um_e2fs->e2fs, M_EXT2MNT); 687 free(ump->um_e2fs, M_EXT2MNT); 688 free(ump, M_EXT2MNT); 689 mp->mnt_data = NULL; 690 } 691 return (error); 692 } 693 694 /* 695 * Unmount system call. 696 */ 697 static int 698 ext2_unmount(struct mount *mp, int mntflags) 699 { 700 struct ext2mount *ump; 701 struct m_ext2fs *fs; 702 struct csum *sump; 703 int error, flags, i, ronly; 704 705 flags = 0; 706 if (mntflags & MNT_FORCE) { 707 if (mp->mnt_flag & MNT_ROOTFS) 708 return (EINVAL); 709 flags |= FORCECLOSE; 710 } 711 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 712 return (error); 713 ump = VFSTOEXT2(mp); 714 fs = ump->um_e2fs; 715 ronly = fs->e2fs_ronly; 716 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 717 if (fs->e2fs_wasvalid) 718 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 719 ext2_sbupdate(ump, MNT_WAIT); 720 } 721 722 g_topology_lock(); 723 g_vfs_close(ump->um_cp); 724 g_topology_unlock(); 725 vrele(ump->um_devvp); 726 sump = fs->e2fs_clustersum; 727 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 728 free(sump->cs_sum, M_EXT2MNT); 729 free(fs->e2fs_clustersum, M_EXT2MNT); 730 free(fs->e2fs_maxcluster, M_EXT2MNT); 731 free(fs->e2fs_gd, M_EXT2MNT); 732 free(fs->e2fs_contigdirs, M_EXT2MNT); 733 free(fs->e2fs, M_EXT2MNT); 734 free(fs, M_EXT2MNT); 735 free(ump, M_EXT2MNT); 736 mp->mnt_data = NULL; 737 MNT_ILOCK(mp); 738 mp->mnt_flag &= ~MNT_LOCAL; 739 MNT_IUNLOCK(mp); 740 return (error); 741 } 742 743 /* 744 * Flush out all the files in a filesystem. 745 */ 746 static int 747 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 748 { 749 int error; 750 751 error = vflush(mp, 0, flags, td); 752 return (error); 753 } 754 /* 755 * Get filesystem statistics. 756 */ 757 int 758 ext2_statfs(struct mount *mp, struct statfs *sbp) 759 { 760 struct ext2mount *ump; 761 struct m_ext2fs *fs; 762 uint32_t overhead, overhead_per_group, ngdb; 763 int i, ngroups; 764 765 ump = VFSTOEXT2(mp); 766 fs = ump->um_e2fs; 767 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 768 panic("ext2_statfs"); 769 770 /* 771 * Compute the overhead (FS structures) 772 */ 773 overhead_per_group = 774 1 /* block bitmap */ + 775 1 /* inode bitmap */ + 776 fs->e2fs_itpg; 777 overhead = fs->e2fs->e2fs_first_dblock + 778 fs->e2fs_gcount * overhead_per_group; 779 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 780 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 781 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 782 if (cg_has_sb(i)) 783 ngroups++; 784 } 785 } else { 786 ngroups = fs->e2fs_gcount; 787 } 788 ngdb = fs->e2fs_gdbcount; 789 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 790 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 791 ngdb += fs->e2fs->e2fs_reserved_ngdb; 792 overhead += ngroups * (1 /* superblock */ + ngdb); 793 794 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 795 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 796 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 797 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 798 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 799 sbp->f_files = fs->e2fs->e2fs_icount; 800 sbp->f_ffree = fs->e2fs->e2fs_ficount; 801 return (0); 802 } 803 804 /* 805 * Go through the disk queues to initiate sandbagged IO; 806 * go through the inodes to write those that have been modified; 807 * initiate the writing of the super block if it has been modified. 808 * 809 * Note: we are always called with the filesystem marked `MPBUSY'. 810 */ 811 static int 812 ext2_sync(struct mount *mp, int waitfor) 813 { 814 struct vnode *mvp, *vp; 815 struct thread *td; 816 struct inode *ip; 817 struct ext2mount *ump = VFSTOEXT2(mp); 818 struct m_ext2fs *fs; 819 int error, allerror = 0; 820 821 td = curthread; 822 fs = ump->um_e2fs; 823 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 824 printf("fs = %s\n", fs->e2fs_fsmnt); 825 panic("ext2_sync: rofs mod"); 826 } 827 828 /* 829 * Write back each (modified) inode. 830 */ 831 loop: 832 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 833 if (vp->v_type == VNON) { 834 VI_UNLOCK(vp); 835 continue; 836 } 837 ip = VTOI(vp); 838 if ((ip->i_flag & 839 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 840 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 841 waitfor == MNT_LAZY)) { 842 VI_UNLOCK(vp); 843 continue; 844 } 845 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 846 if (error) { 847 if (error == ENOENT) { 848 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 849 goto loop; 850 } 851 continue; 852 } 853 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 854 allerror = error; 855 VOP_UNLOCK(vp, 0); 856 vrele(vp); 857 } 858 859 /* 860 * Force stale filesystem control information to be flushed. 861 */ 862 if (waitfor != MNT_LAZY) { 863 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 864 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 865 allerror = error; 866 VOP_UNLOCK(ump->um_devvp, 0); 867 } 868 869 /* 870 * Write back modified superblock. 871 */ 872 if (fs->e2fs_fmod != 0) { 873 fs->e2fs_fmod = 0; 874 fs->e2fs->e2fs_wtime = time_second; 875 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 876 allerror = error; 877 } 878 return (allerror); 879 } 880 881 /* 882 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 883 * in from disk. If it is in core, wait for the lock bit to clear, then 884 * return the inode locked. Detection and handling of mount points must be 885 * done by the calling routine. 886 */ 887 static int 888 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 889 { 890 struct m_ext2fs *fs; 891 struct inode *ip; 892 struct ext2mount *ump; 893 struct buf *bp; 894 struct vnode *vp; 895 struct thread *td; 896 int i, error; 897 int used_blocks; 898 899 td = curthread; 900 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 901 if (error || *vpp != NULL) 902 return (error); 903 904 ump = VFSTOEXT2(mp); 905 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 906 907 /* Allocate a new vnode/inode. */ 908 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 909 *vpp = NULL; 910 free(ip, M_EXT2NODE); 911 return (error); 912 } 913 vp->v_data = ip; 914 ip->i_vnode = vp; 915 ip->i_e2fs = fs = ump->um_e2fs; 916 ip->i_ump = ump; 917 ip->i_number = ino; 918 919 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 920 error = insmntque(vp, mp); 921 if (error != 0) { 922 free(ip, M_EXT2NODE); 923 *vpp = NULL; 924 return (error); 925 } 926 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 927 if (error || *vpp != NULL) 928 return (error); 929 930 /* Read in the disk contents for the inode, copy into the inode. */ 931 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 932 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 933 /* 934 * The inode does not contain anything useful, so it would 935 * be misleading to leave it on its hash chain. With mode 936 * still zero, it will be unlinked and returned to the free 937 * list by vput(). 938 */ 939 brelse(bp); 940 vput(vp); 941 *vpp = NULL; 942 return (error); 943 } 944 /* convert ext2 inode to dinode */ 945 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 946 ino_to_fsbo(fs, ino)), ip); 947 ip->i_block_group = ino_to_cg(fs, ino); 948 ip->i_next_alloc_block = 0; 949 ip->i_next_alloc_goal = 0; 950 951 /* 952 * Now we want to make sure that block pointers for unused 953 * blocks are zeroed out - ext2_balloc depends on this 954 * although for regular files and directories only 955 * 956 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 957 * out because we could corrupt the extent tree. 958 */ 959 if (!(ip->i_flag & IN_E4EXTENTS) && 960 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 961 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 962 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 963 ip->i_db[i] = 0; 964 } 965 #ifdef EXT2FS_DEBUG 966 ext2_print_inode(ip); 967 #endif 968 bqrelse(bp); 969 970 /* 971 * Initialize the vnode from the inode, check for aliases. 972 * Note that the underlying vnode may have changed. 973 */ 974 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 975 vput(vp); 976 *vpp = NULL; 977 return (error); 978 } 979 980 /* 981 * Finish inode initialization. 982 */ 983 984 *vpp = vp; 985 return (0); 986 } 987 988 /* 989 * File handle to vnode 990 * 991 * Have to be really careful about stale file handles: 992 * - check that the inode number is valid 993 * - call ext2_vget() to get the locked inode 994 * - check for an unallocated inode (i_mode == 0) 995 * - check that the given client host has export rights and return 996 * those rights via. exflagsp and credanonp 997 */ 998 static int 999 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1000 { 1001 struct inode *ip; 1002 struct ufid *ufhp; 1003 struct vnode *nvp; 1004 struct m_ext2fs *fs; 1005 int error; 1006 1007 ufhp = (struct ufid *)fhp; 1008 fs = VFSTOEXT2(mp)->um_e2fs; 1009 if (ufhp->ufid_ino < EXT2_ROOTINO || 1010 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1011 return (ESTALE); 1012 1013 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1014 if (error) { 1015 *vpp = NULLVP; 1016 return (error); 1017 } 1018 ip = VTOI(nvp); 1019 if (ip->i_mode == 0 || 1020 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1021 vput(nvp); 1022 *vpp = NULLVP; 1023 return (ESTALE); 1024 } 1025 *vpp = nvp; 1026 vnode_create_vobject(*vpp, 0, curthread); 1027 return (0); 1028 } 1029 1030 /* 1031 * Write a superblock and associated information back to disk. 1032 */ 1033 static int 1034 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1035 { 1036 struct m_ext2fs *fs = mp->um_e2fs; 1037 struct ext2fs *es = fs->e2fs; 1038 struct buf *bp; 1039 int error = 0; 1040 1041 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1042 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1043 if (waitfor == MNT_WAIT) 1044 error = bwrite(bp); 1045 else 1046 bawrite(bp); 1047 1048 /* 1049 * The buffers for group descriptors, inode bitmaps and block bitmaps 1050 * are not busy at this point and are (hopefully) written by the 1051 * usual sync mechanism. No need to write them here. 1052 */ 1053 return (error); 1054 } 1055 int 1056 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1057 { 1058 struct m_ext2fs *fs = mp->um_e2fs; 1059 struct buf *bp; 1060 int i, error = 0, allerror = 0; 1061 1062 allerror = ext2_sbupdate(mp, waitfor); 1063 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1064 bp = getblk(mp->um_devvp, fsbtodb(fs, 1065 fs->e2fs->e2fs_first_dblock + 1066 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1067 e2fs_cgsave(&fs->e2fs_gd[ 1068 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1069 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1070 if (waitfor == MNT_WAIT) 1071 error = bwrite(bp); 1072 else 1073 bawrite(bp); 1074 } 1075 1076 if (!allerror && error) 1077 allerror = error; 1078 return (allerror); 1079 } 1080 /* 1081 * Return the root of a filesystem. 1082 */ 1083 static int 1084 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1085 { 1086 struct vnode *nvp; 1087 int error; 1088 1089 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1090 if (error) 1091 return (error); 1092 *vpp = nvp; 1093 return (0); 1094 }
Cache object: 8404411829d5179bfcfe5c4ecc37d342
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