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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/9.2/sys/fs/ext2fs/ext2_vfsops.c 251731 2013-06-14 03:58:52Z 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 = 0; 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 DROP_GIANT(); 162 g_topology_lock(); 163 g_access(ump->um_cp, 0, -1, 0); 164 g_topology_unlock(); 165 PICKUP_GIANT(); 166 } 167 if (!error && (mp->mnt_flag & MNT_RELOAD)) 168 error = ext2_reload(mp, td); 169 if (error) 170 return (error); 171 devvp = ump->um_devvp; 172 if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) { 173 if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0)) 174 return (EPERM); 175 176 /* 177 * If upgrade to read-write by non-root, then verify 178 * that user has necessary permissions on the device. 179 */ 180 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 181 error = VOP_ACCESS(devvp, VREAD | VWRITE, 182 td->td_ucred, td); 183 if (error) 184 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 185 if (error) { 186 VOP_UNLOCK(devvp, 0); 187 return (error); 188 } 189 VOP_UNLOCK(devvp, 0); 190 DROP_GIANT(); 191 g_topology_lock(); 192 error = g_access(ump->um_cp, 0, 1, 0); 193 g_topology_unlock(); 194 PICKUP_GIANT(); 195 if (error) 196 return (error); 197 198 if ((fs->e2fs->e2fs_state & E2FS_ISCLEAN) == 0 || 199 (fs->e2fs->e2fs_state & E2FS_ERRORS)) { 200 if (mp->mnt_flag & MNT_FORCE) { 201 printf( 202 "WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt); 203 } else { 204 printf( 205 "WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n", 206 fs->e2fs_fsmnt); 207 return (EPERM); 208 } 209 } 210 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; 211 (void)ext2_cgupdate(ump, MNT_WAIT); 212 fs->e2fs_ronly = 0; 213 MNT_ILOCK(mp); 214 mp->mnt_flag &= ~MNT_RDONLY; 215 MNT_IUNLOCK(mp); 216 } 217 if (vfs_flagopt(opts, "export", NULL, 0)) { 218 /* Process export requests in vfs_mount.c. */ 219 return (error); 220 } 221 } 222 223 /* 224 * Not an update, or updating the name: look up the name 225 * and verify that it refers to a sensible disk device. 226 */ 227 if (fspec == NULL) 228 return (EINVAL); 229 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 230 if ((error = namei(ndp)) != 0) 231 return (error); 232 NDFREE(ndp, NDF_ONLY_PNBUF); 233 devvp = ndp->ni_vp; 234 235 if (!vn_isdisk(devvp, &error)) { 236 vput(devvp); 237 return (error); 238 } 239 240 /* 241 * If mount by non-root, then verify that user has necessary 242 * permissions on the device. 243 * 244 * XXXRW: VOP_ACCESS() enough? 245 */ 246 accmode = VREAD; 247 if ((mp->mnt_flag & MNT_RDONLY) == 0) 248 accmode |= VWRITE; 249 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 250 if (error) 251 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 252 if (error) { 253 vput(devvp); 254 return (error); 255 } 256 257 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 258 error = ext2_mountfs(devvp, mp); 259 } else { 260 if (devvp != ump->um_devvp) { 261 vput(devvp); 262 return (EINVAL); /* needs translation */ 263 } else 264 vput(devvp); 265 } 266 if (error) { 267 vrele(devvp); 268 return (error); 269 } 270 ump = VFSTOEXT2(mp); 271 fs = ump->um_e2fs; 272 273 /* 274 * Note that this strncpy() is ok because of a check at the start 275 * of ext2_mount(). 276 */ 277 strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN); 278 fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0'; 279 vfs_mountedfrom(mp, fspec); 280 return (0); 281 } 282 283 static int 284 ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly) 285 { 286 287 if (es->e2fs_magic != E2FS_MAGIC) { 288 printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n", 289 devtoname(dev), es->e2fs_magic, E2FS_MAGIC); 290 return (1); 291 } 292 if (es->e2fs_rev > E2FS_REV0) { 293 if (es->e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) { 294 printf( 295 "WARNING: mount of %s denied due to unsupported optional features\n", 296 devtoname(dev)); 297 return (1); 298 } 299 if (!ronly && 300 (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) { 301 printf("WARNING: R/W mount of %s denied due to " 302 "unsupported optional features\n", devtoname(dev)); 303 return (1); 304 } 305 } 306 return (0); 307 } 308 309 /* 310 * This computes the fields of the ext2_sb_info structure from the 311 * data in the ext2_super_block structure read in. 312 */ 313 static int 314 compute_sb_data(struct vnode *devvp, struct ext2fs *es, 315 struct m_ext2fs *fs) 316 { 317 int db_count, error; 318 int i; 319 int logic_sb_block = 1; /* XXX for now */ 320 struct buf *bp; 321 uint32_t e2fs_descpb; 322 323 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 324 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 325 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 326 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 327 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 328 if (fs->e2fs_fsize) 329 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 330 fs->e2fs_bpg = es->e2fs_bpg; 331 fs->e2fs_fpg = es->e2fs_fpg; 332 fs->e2fs_ipg = es->e2fs_ipg; 333 if (es->e2fs_rev == E2FS_REV0) { 334 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ; 335 } else { 336 fs->e2fs_isize = es->e2fs_inode_size; 337 338 /* 339 * Simple sanity check for superblock inode size value. 340 */ 341 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 342 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 343 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 344 printf("ext2fs: invalid inode size %d\n", 345 fs->e2fs_isize); 346 return (EIO); 347 } 348 } 349 /* Check for extra isize in big inodes. */ 350 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 351 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 352 printf("ext2fs: no space for extra inode timestamps\n"); 353 return (EINVAL); 354 } 355 356 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 357 fs->e2fs_itpg = fs->e2fs_ipg /fs->e2fs_ipb; 358 /* s_resuid / s_resgid ? */ 359 fs->e2fs_gcount = (es->e2fs_bcount - es->e2fs_first_dblock + 360 EXT2_BLOCKS_PER_GROUP(fs) - 1) / EXT2_BLOCKS_PER_GROUP(fs); 361 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 362 db_count = (fs->e2fs_gcount + e2fs_descpb - 1) / e2fs_descpb; 363 fs->e2fs_gdbcount = db_count; 364 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize, 365 M_EXT2MNT, M_WAITOK); 366 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 367 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK); 368 369 /* 370 * Adjust logic_sb_block. 371 * Godmar thinks: if the blocksize is greater than 1024, then 372 * the superblock is logically part of block zero. 373 */ 374 if(fs->e2fs_bsize > SBSIZE) 375 logic_sb_block = 0; 376 for (i = 0; i < db_count; i++) { 377 error = bread(devvp , 378 fsbtodb(fs, logic_sb_block + i + 1 ), 379 fs->e2fs_bsize, NOCRED, &bp); 380 if (error) { 381 free(fs->e2fs_gd, M_EXT2MNT); 382 brelse(bp); 383 return (error); 384 } 385 e2fs_cgload((struct ext2_gd *)bp->b_data, 386 &fs->e2fs_gd[ 387 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 388 fs->e2fs_bsize); 389 brelse(bp); 390 bp = NULL; 391 } 392 fs->e2fs_total_dir = 0; 393 for (i=0; i < fs->e2fs_gcount; i++){ 394 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs; 395 fs->e2fs_contigdirs[i] = 0; 396 } 397 if (es->e2fs_rev == E2FS_REV0 || 398 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 399 fs->e2fs_maxfilesize = 0x7fffffff; 400 else 401 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 402 return (0); 403 } 404 405 /* 406 * Reload all incore data for a filesystem (used after running fsck on 407 * the root filesystem and finding things to fix). The filesystem must 408 * be mounted read-only. 409 * 410 * Things to do to update the mount: 411 * 1) invalidate all cached meta-data. 412 * 2) re-read superblock from disk. 413 * 3) invalidate all cluster summary information. 414 * 4) invalidate all inactive vnodes. 415 * 5) invalidate all cached file data. 416 * 6) re-read inode data for all active vnodes. 417 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 418 */ 419 static int 420 ext2_reload(struct mount *mp, struct thread *td) 421 { 422 struct vnode *vp, *mvp, *devvp; 423 struct inode *ip; 424 struct buf *bp; 425 struct ext2fs *es; 426 struct m_ext2fs *fs; 427 struct csum *sump; 428 int error, i; 429 int32_t *lp; 430 431 if ((mp->mnt_flag & MNT_RDONLY) == 0) 432 return (EINVAL); 433 /* 434 * Step 1: invalidate all cached meta-data. 435 */ 436 devvp = VFSTOEXT2(mp)->um_devvp; 437 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 438 if (vinvalbuf(devvp, 0, 0, 0) != 0) 439 panic("ext2_reload: dirty1"); 440 VOP_UNLOCK(devvp, 0); 441 442 /* 443 * Step 2: re-read superblock from disk. 444 * constants have been adjusted for ext2 445 */ 446 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 447 return (error); 448 es = (struct ext2fs *)bp->b_data; 449 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 450 brelse(bp); 451 return (EIO); /* XXX needs translation */ 452 } 453 fs = VFSTOEXT2(mp)->um_e2fs; 454 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 455 456 if((error = compute_sb_data(devvp, es, fs)) != 0) { 457 brelse(bp); 458 return (error); 459 } 460 #ifdef UNKLAR 461 if (fs->fs_sbsize < SBSIZE) 462 bp->b_flags |= B_INVAL; 463 #endif 464 brelse(bp); 465 466 /* 467 * Step 3: invalidate all cluster summary information. 468 */ 469 if (fs->e2fs_contigsumsize > 0) { 470 lp = fs->e2fs_maxcluster; 471 sump = fs->e2fs_clustersum; 472 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 473 *lp++ = fs->e2fs_contigsumsize; 474 sump->cs_init = 0; 475 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 476 } 477 } 478 479 loop: 480 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 481 /* 482 * Step 4: invalidate all cached file data. 483 */ 484 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 485 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 486 goto loop; 487 } 488 if (vinvalbuf(vp, 0, 0, 0)) 489 panic("ext2_reload: dirty2"); 490 491 /* 492 * Step 5: re-read inode data for all active vnodes. 493 */ 494 ip = VTOI(vp); 495 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 496 (int)fs->e2fs_bsize, NOCRED, &bp); 497 if (error) { 498 VOP_UNLOCK(vp, 0); 499 vrele(vp); 500 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 501 return (error); 502 } 503 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + 504 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 505 brelse(bp); 506 VOP_UNLOCK(vp, 0); 507 vrele(vp); 508 } 509 return (0); 510 } 511 512 /* 513 * Common code for mount and mountroot. 514 */ 515 static int 516 ext2_mountfs(struct vnode *devvp, struct mount *mp) 517 { 518 struct ext2mount *ump; 519 struct buf *bp; 520 struct m_ext2fs *fs; 521 struct ext2fs *es; 522 struct cdev *dev = devvp->v_rdev; 523 struct g_consumer *cp; 524 struct bufobj *bo; 525 struct csum *sump; 526 int error; 527 int ronly; 528 int i, size; 529 int32_t *lp; 530 int32_t e2fs_maxcontig; 531 532 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 533 /* XXX: use VOP_ACESS to check FS perms */ 534 DROP_GIANT(); 535 g_topology_lock(); 536 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 537 g_topology_unlock(); 538 PICKUP_GIANT(); 539 VOP_UNLOCK(devvp, 0); 540 if (error) 541 return (error); 542 543 /* XXX: should we check for some sectorsize or 512 instead? */ 544 if (((SBSIZE % cp->provider->sectorsize) != 0) || 545 (SBSIZE < cp->provider->sectorsize)) { 546 DROP_GIANT(); 547 g_topology_lock(); 548 g_vfs_close(cp); 549 g_topology_unlock(); 550 PICKUP_GIANT(); 551 return (EINVAL); 552 } 553 554 bo = &devvp->v_bufobj; 555 bo->bo_private = cp; 556 bo->bo_ops = g_vfs_bufops; 557 if (devvp->v_rdev->si_iosize_max != 0) 558 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 559 if (mp->mnt_iosize_max > MAXPHYS) 560 mp->mnt_iosize_max = MAXPHYS; 561 562 bp = NULL; 563 ump = NULL; 564 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 565 goto out; 566 es = (struct ext2fs *)bp->b_data; 567 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 568 error = EINVAL; /* XXX needs translation */ 569 goto out; 570 } 571 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 572 (es->e2fs_state & E2FS_ERRORS)) { 573 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 574 printf( 575 "WARNING: Filesystem was not properly dismounted\n"); 576 } else { 577 printf( 578 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 579 error = EPERM; 580 goto out; 581 } 582 } 583 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 584 585 /* 586 * I don't know whether this is the right strategy. Note that 587 * we dynamically allocate both an ext2_sb_info and an ext2_super_block 588 * while Linux keeps the super block in a locked buffer. 589 */ 590 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 591 M_EXT2MNT, M_WAITOK); 592 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 593 M_EXT2MNT, M_WAITOK); 594 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 595 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 596 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 597 goto out; 598 599 /* 600 * Calculate the maximum contiguous blocks and size of cluster summary 601 * array. In FFS this is done by newfs; however, the superblock 602 * in ext2fs doesn't have these variables, so we can calculate 603 * them here. 604 */ 605 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 606 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 607 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 608 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 609 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 610 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 611 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 612 lp = ump->um_e2fs->e2fs_maxcluster; 613 sump = ump->um_e2fs->e2fs_clustersum; 614 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 615 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 616 sump->cs_init = 0; 617 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 618 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 619 } 620 } 621 622 brelse(bp); 623 bp = NULL; 624 fs = ump->um_e2fs; 625 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 626 627 /* 628 * If the fs is not mounted read-only, make sure the super block is 629 * always written back on a sync(). 630 */ 631 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 632 if (ronly == 0) { 633 fs->e2fs_fmod = 1; /* mark it modified */ 634 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 635 } 636 mp->mnt_data = ump; 637 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 638 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 639 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 640 MNT_ILOCK(mp); 641 mp->mnt_flag |= MNT_LOCAL; 642 MNT_IUNLOCK(mp); 643 ump->um_mountp = mp; 644 ump->um_dev = dev; 645 ump->um_devvp = devvp; 646 ump->um_bo = &devvp->v_bufobj; 647 ump->um_cp = cp; 648 649 /* 650 * Setting those two parameters allowed us to use 651 * ufs_bmap w/o changse! 652 */ 653 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 654 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 655 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 656 if (ronly == 0) 657 ext2_sbupdate(ump, MNT_WAIT); 658 /* 659 * Initialize filesystem stat information in mount struct. 660 */ 661 MNT_ILOCK(mp); 662 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED | 663 MNTK_EXTENDED_SHARED; 664 MNT_IUNLOCK(mp); 665 return (0); 666 out: 667 if (bp) 668 brelse(bp); 669 if (cp != NULL) { 670 DROP_GIANT(); 671 g_topology_lock(); 672 g_vfs_close(cp); 673 g_topology_unlock(); 674 PICKUP_GIANT(); 675 } 676 if (ump) { 677 mtx_destroy(EXT2_MTX(ump)); 678 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 679 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 680 free(ump->um_e2fs->e2fs, M_EXT2MNT); 681 free(ump->um_e2fs, M_EXT2MNT); 682 free(ump, M_EXT2MNT); 683 mp->mnt_data = NULL; 684 } 685 return (error); 686 } 687 688 /* 689 * Unmount system call. 690 */ 691 static int 692 ext2_unmount(struct mount *mp, int mntflags) 693 { 694 struct ext2mount *ump; 695 struct m_ext2fs *fs; 696 struct csum *sump; 697 int error, flags, i, ronly; 698 699 flags = 0; 700 if (mntflags & MNT_FORCE) { 701 if (mp->mnt_flag & MNT_ROOTFS) 702 return (EINVAL); 703 flags |= FORCECLOSE; 704 } 705 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 706 return (error); 707 ump = VFSTOEXT2(mp); 708 fs = ump->um_e2fs; 709 ronly = fs->e2fs_ronly; 710 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 711 if (fs->e2fs_wasvalid) 712 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 713 ext2_sbupdate(ump, MNT_WAIT); 714 } 715 716 DROP_GIANT(); 717 g_topology_lock(); 718 g_vfs_close(ump->um_cp); 719 g_topology_unlock(); 720 PICKUP_GIANT(); 721 vrele(ump->um_devvp); 722 sump = fs->e2fs_clustersum; 723 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 724 free(sump->cs_sum, M_EXT2MNT); 725 free(fs->e2fs_clustersum, M_EXT2MNT); 726 free(fs->e2fs_maxcluster, M_EXT2MNT); 727 free(fs->e2fs_gd, M_EXT2MNT); 728 free(fs->e2fs_contigdirs, M_EXT2MNT); 729 free(fs->e2fs, M_EXT2MNT); 730 free(fs, M_EXT2MNT); 731 free(ump, M_EXT2MNT); 732 mp->mnt_data = NULL; 733 MNT_ILOCK(mp); 734 mp->mnt_flag &= ~MNT_LOCAL; 735 MNT_IUNLOCK(mp); 736 return (error); 737 } 738 739 /* 740 * Flush out all the files in a filesystem. 741 */ 742 static int 743 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 744 { 745 int error; 746 747 error = vflush(mp, 0, flags, td); 748 return (error); 749 } 750 /* 751 * Get filesystem statistics. 752 */ 753 int 754 ext2_statfs(struct mount *mp, struct statfs *sbp) 755 { 756 struct ext2mount *ump; 757 struct m_ext2fs *fs; 758 uint32_t overhead, overhead_per_group, ngdb; 759 int i, ngroups; 760 761 ump = VFSTOEXT2(mp); 762 fs = ump->um_e2fs; 763 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 764 panic("ext2_statfs"); 765 766 /* 767 * Compute the overhead (FS structures) 768 */ 769 overhead_per_group = 770 1 /* block bitmap */ + 771 1 /* inode bitmap */ + 772 fs->e2fs_itpg; 773 overhead = fs->e2fs->e2fs_first_dblock + 774 fs->e2fs_gcount * overhead_per_group; 775 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 776 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 777 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 778 if (cg_has_sb(i)) 779 ngroups++; 780 } 781 } else { 782 ngroups = fs->e2fs_gcount; 783 } 784 ngdb = fs->e2fs_gdbcount; 785 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 786 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 787 ngdb += fs->e2fs->e2fs_reserved_ngdb; 788 overhead += ngroups * (1 /* superblock */ + ngdb); 789 790 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 791 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 792 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 793 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 794 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 795 sbp->f_files = fs->e2fs->e2fs_icount; 796 sbp->f_ffree = fs->e2fs->e2fs_ficount; 797 return (0); 798 } 799 800 /* 801 * Go through the disk queues to initiate sandbagged IO; 802 * go through the inodes to write those that have been modified; 803 * initiate the writing of the super block if it has been modified. 804 * 805 * Note: we are always called with the filesystem marked `MPBUSY'. 806 */ 807 static int 808 ext2_sync(struct mount *mp, int waitfor) 809 { 810 struct vnode *mvp, *vp; 811 struct thread *td; 812 struct inode *ip; 813 struct ext2mount *ump = VFSTOEXT2(mp); 814 struct m_ext2fs *fs; 815 int error, allerror = 0; 816 817 td = curthread; 818 fs = ump->um_e2fs; 819 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 820 printf("fs = %s\n", fs->e2fs_fsmnt); 821 panic("ext2_sync: rofs mod"); 822 } 823 824 /* 825 * Write back each (modified) inode. 826 */ 827 loop: 828 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 829 if (vp->v_type == VNON) { 830 VI_UNLOCK(vp); 831 continue; 832 } 833 ip = VTOI(vp); 834 if ((ip->i_flag & 835 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 836 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 837 waitfor == MNT_LAZY)) { 838 VI_UNLOCK(vp); 839 continue; 840 } 841 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 842 if (error) { 843 if (error == ENOENT) { 844 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 845 goto loop; 846 } 847 continue; 848 } 849 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 850 allerror = error; 851 VOP_UNLOCK(vp, 0); 852 vrele(vp); 853 } 854 855 /* 856 * Force stale filesystem control information to be flushed. 857 */ 858 if (waitfor != MNT_LAZY) { 859 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 860 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 861 allerror = error; 862 VOP_UNLOCK(ump->um_devvp, 0); 863 } 864 865 /* 866 * Write back modified superblock. 867 */ 868 if (fs->e2fs_fmod != 0) { 869 fs->e2fs_fmod = 0; 870 fs->e2fs->e2fs_wtime = time_second; 871 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 872 allerror = error; 873 } 874 return (allerror); 875 } 876 877 /* 878 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 879 * in from disk. If it is in core, wait for the lock bit to clear, then 880 * return the inode locked. Detection and handling of mount points must be 881 * done by the calling routine. 882 */ 883 static int 884 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 885 { 886 struct m_ext2fs *fs; 887 struct inode *ip; 888 struct ext2mount *ump; 889 struct buf *bp; 890 struct vnode *vp; 891 struct cdev *dev; 892 struct thread *td; 893 int i, error; 894 int used_blocks; 895 896 td = curthread; 897 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 898 if (error || *vpp != NULL) 899 return (error); 900 901 ump = VFSTOEXT2(mp); 902 dev = ump->um_dev; 903 904 /* 905 * If this malloc() is performed after the getnewvnode() 906 * it might block, leaving a vnode with a NULL v_data to be 907 * found by ext2_sync() if a sync happens to fire right then, 908 * which will cause a panic because ext2_sync() blindly 909 * dereferences vp->v_data (as well it should). 910 */ 911 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 912 913 /* Allocate a new vnode/inode. */ 914 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 915 *vpp = NULL; 916 free(ip, M_EXT2NODE); 917 return (error); 918 } 919 vp->v_data = ip; 920 ip->i_vnode = vp; 921 ip->i_e2fs = fs = ump->um_e2fs; 922 ip->i_ump = ump; 923 ip->i_number = ino; 924 925 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 926 error = insmntque(vp, mp); 927 if (error != 0) { 928 free(ip, M_EXT2NODE); 929 *vpp = NULL; 930 return (error); 931 } 932 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 933 if (error || *vpp != NULL) 934 return (error); 935 936 /* Read in the disk contents for the inode, copy into the inode. */ 937 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 938 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 939 /* 940 * The inode does not contain anything useful, so it would 941 * be misleading to leave it on its hash chain. With mode 942 * still zero, it will be unlinked and returned to the free 943 * list by vput(). 944 */ 945 brelse(bp); 946 vput(vp); 947 *vpp = NULL; 948 return (error); 949 } 950 /* convert ext2 inode to dinode */ 951 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 952 ino_to_fsbo(fs, ino)), ip); 953 ip->i_block_group = ino_to_cg(fs, ino); 954 ip->i_next_alloc_block = 0; 955 ip->i_next_alloc_goal = 0; 956 957 /* 958 * Now we want to make sure that block pointers for unused 959 * blocks are zeroed out - ext2_balloc depends on this 960 * although for regular files and directories only 961 */ 962 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 963 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize; 964 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 965 ip->i_db[i] = 0; 966 } 967 /* 968 ext2_print_inode(ip); 969 */ 970 bqrelse(bp); 971 972 /* 973 * Initialize the vnode from the inode, check for aliases. 974 * Note that the underlying vnode may have changed. 975 */ 976 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 977 vput(vp); 978 *vpp = NULL; 979 return (error); 980 } 981 982 /* 983 * Finish inode initialization. 984 */ 985 986 /* 987 * Set up a generation number for this inode if it does not 988 * already have one. This should only happen on old filesystems. 989 */ 990 if (ip->i_gen == 0) { 991 ip->i_gen = random() / 2 + 1; 992 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 993 ip->i_flag |= IN_MODIFIED; 994 } 995 *vpp = vp; 996 return (0); 997 } 998 999 /* 1000 * File handle to vnode 1001 * 1002 * Have to be really careful about stale file handles: 1003 * - check that the inode number is valid 1004 * - call ext2_vget() to get the locked inode 1005 * - check for an unallocated inode (i_mode == 0) 1006 * - check that the given client host has export rights and return 1007 * those rights via. exflagsp and credanonp 1008 */ 1009 static int 1010 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1011 { 1012 struct inode *ip; 1013 struct ufid *ufhp; 1014 struct vnode *nvp; 1015 struct m_ext2fs *fs; 1016 int error; 1017 1018 ufhp = (struct ufid *)fhp; 1019 fs = VFSTOEXT2(mp)->um_e2fs; 1020 if (ufhp->ufid_ino < EXT2_ROOTINO || 1021 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1022 return (ESTALE); 1023 1024 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1025 if (error) { 1026 *vpp = NULLVP; 1027 return (error); 1028 } 1029 ip = VTOI(nvp); 1030 if (ip->i_mode == 0 || 1031 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1032 vput(nvp); 1033 *vpp = NULLVP; 1034 return (ESTALE); 1035 } 1036 *vpp = nvp; 1037 vnode_create_vobject(*vpp, 0, curthread); 1038 return (0); 1039 } 1040 1041 /* 1042 * Write a superblock and associated information back to disk. 1043 */ 1044 static int 1045 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1046 { 1047 struct m_ext2fs *fs = mp->um_e2fs; 1048 struct ext2fs *es = fs->e2fs; 1049 struct buf *bp; 1050 int error = 0; 1051 1052 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1053 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1054 if (waitfor == MNT_WAIT) 1055 error = bwrite(bp); 1056 else 1057 bawrite(bp); 1058 1059 /* 1060 * The buffers for group descriptors, inode bitmaps and block bitmaps 1061 * are not busy at this point and are (hopefully) written by the 1062 * usual sync mechanism. No need to write them here. 1063 */ 1064 return (error); 1065 } 1066 int 1067 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1068 { 1069 struct m_ext2fs *fs = mp->um_e2fs; 1070 struct buf *bp; 1071 int i, error = 0, allerror = 0; 1072 1073 allerror = ext2_sbupdate(mp, waitfor); 1074 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1075 bp = getblk(mp->um_devvp, fsbtodb(fs, 1076 fs->e2fs->e2fs_first_dblock + 1077 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1078 e2fs_cgsave(&fs->e2fs_gd[ 1079 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1080 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1081 if (waitfor == MNT_WAIT) 1082 error = bwrite(bp); 1083 else 1084 bawrite(bp); 1085 } 1086 1087 if (!allerror && error) 1088 allerror = error; 1089 return (allerror); 1090 } 1091 /* 1092 * Return the root of a filesystem. 1093 */ 1094 static int 1095 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1096 { 1097 struct vnode *nvp; 1098 int error; 1099 1100 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1101 if (error) 1102 return (error); 1103 *vpp = nvp; 1104 return (0); 1105 }
Cache object: 2f0e6ebc713a56594a167c716d5a848b
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