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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 * $FreeBSD$ 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 EXT4F_RO_INCOMPAT_SUPP)) { 295 printf( 296 "WARNING: mount of %s denied due to unsupported optional features\n", 297 devtoname(dev)); 298 return (1); 299 } 300 if (!ronly && 301 (es->e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP)) { 302 printf("WARNING: R/W mount of %s denied due to " 303 "unsupported optional features\n", devtoname(dev)); 304 return (1); 305 } 306 } 307 return (0); 308 } 309 310 /* 311 * This computes the fields of the m_ext2fs structure from the 312 * data in the ext2fs structure read in. 313 */ 314 static int 315 compute_sb_data(struct vnode *devvp, struct ext2fs *es, 316 struct m_ext2fs *fs) 317 { 318 int db_count, error; 319 int i; 320 int logic_sb_block = 1; /* XXX for now */ 321 struct buf *bp; 322 uint32_t e2fs_descpb; 323 324 fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + es->e2fs_log_bsize; 325 fs->e2fs_bsize = 1U << fs->e2fs_bshift; 326 fs->e2fs_fsbtodb = es->e2fs_log_bsize + 1; 327 fs->e2fs_qbmask = fs->e2fs_bsize - 1; 328 fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << es->e2fs_log_fsize; 329 if (fs->e2fs_fsize) 330 fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize; 331 fs->e2fs_bpg = es->e2fs_bpg; 332 fs->e2fs_fpg = es->e2fs_fpg; 333 fs->e2fs_ipg = es->e2fs_ipg; 334 if (es->e2fs_rev == E2FS_REV0) { 335 fs->e2fs_isize = E2FS_REV0_INODE_SIZE ; 336 } else { 337 fs->e2fs_isize = es->e2fs_inode_size; 338 339 /* 340 * Simple sanity check for superblock inode size value. 341 */ 342 if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE || 343 EXT2_INODE_SIZE(fs) > fs->e2fs_bsize || 344 (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) { 345 printf("ext2fs: invalid inode size %d\n", 346 fs->e2fs_isize); 347 return (EIO); 348 } 349 } 350 /* Check for extra isize in big inodes. */ 351 if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) && 352 EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) { 353 printf("ext2fs: no space for extra inode timestamps\n"); 354 return (EINVAL); 355 } 356 357 fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); 358 fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; 359 /* s_resuid / s_resgid ? */ 360 fs->e2fs_gcount = howmany(es->e2fs_bcount - es->e2fs_first_dblock, 361 EXT2_BLOCKS_PER_GROUP(fs)); 362 e2fs_descpb = fs->e2fs_bsize / sizeof(struct ext2_gd); 363 db_count = howmany(fs->e2fs_gcount, e2fs_descpb); 364 fs->e2fs_gdbcount = db_count; 365 fs->e2fs_gd = malloc(db_count * fs->e2fs_bsize, 366 M_EXT2MNT, M_WAITOK); 367 fs->e2fs_contigdirs = malloc(fs->e2fs_gcount * 368 sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO); 369 370 /* 371 * Adjust logic_sb_block. 372 * Godmar thinks: if the blocksize is greater than 1024, then 373 * the superblock is logically part of block zero. 374 */ 375 if(fs->e2fs_bsize > SBSIZE) 376 logic_sb_block = 0; 377 for (i = 0; i < db_count; i++) { 378 error = bread(devvp , 379 fsbtodb(fs, logic_sb_block + i + 1 ), 380 fs->e2fs_bsize, NOCRED, &bp); 381 if (error) { 382 free(fs->e2fs_contigdirs, M_EXT2MNT); 383 free(fs->e2fs_gd, M_EXT2MNT); 384 brelse(bp); 385 return (error); 386 } 387 e2fs_cgload((struct ext2_gd *)bp->b_data, 388 &fs->e2fs_gd[ 389 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 390 fs->e2fs_bsize); 391 brelse(bp); 392 bp = NULL; 393 } 394 /* Initialization for the ext2 Orlov allocator variant. */ 395 fs->e2fs_total_dir = 0; 396 for (i = 0; i < fs->e2fs_gcount; i++) 397 fs->e2fs_total_dir += fs->e2fs_gd[i].ext2bgd_ndirs; 398 399 if (es->e2fs_rev == E2FS_REV0 || 400 !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE)) 401 fs->e2fs_maxfilesize = 0x7fffffff; 402 else 403 fs->e2fs_maxfilesize = 0x7fffffffffffffff; 404 return (0); 405 } 406 407 /* 408 * Reload all incore data for a filesystem (used after running fsck on 409 * the root filesystem and finding things to fix). The filesystem must 410 * be mounted read-only. 411 * 412 * Things to do to update the mount: 413 * 1) invalidate all cached meta-data. 414 * 2) re-read superblock from disk. 415 * 3) invalidate all cluster summary information. 416 * 4) invalidate all inactive vnodes. 417 * 5) invalidate all cached file data. 418 * 6) re-read inode data for all active vnodes. 419 * XXX we are missing some steps, in particular # 3, this has to be reviewed. 420 */ 421 static int 422 ext2_reload(struct mount *mp, struct thread *td) 423 { 424 struct vnode *vp, *mvp, *devvp; 425 struct inode *ip; 426 struct buf *bp; 427 struct ext2fs *es; 428 struct m_ext2fs *fs; 429 struct csum *sump; 430 int error, i; 431 int32_t *lp; 432 433 if ((mp->mnt_flag & MNT_RDONLY) == 0) 434 return (EINVAL); 435 /* 436 * Step 1: invalidate all cached meta-data. 437 */ 438 devvp = VFSTOEXT2(mp)->um_devvp; 439 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 440 if (vinvalbuf(devvp, 0, 0, 0) != 0) 441 panic("ext2_reload: dirty1"); 442 VOP_UNLOCK(devvp, 0); 443 444 /* 445 * Step 2: re-read superblock from disk. 446 * constants have been adjusted for ext2 447 */ 448 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 449 return (error); 450 es = (struct ext2fs *)bp->b_data; 451 if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) { 452 brelse(bp); 453 return (EIO); /* XXX needs translation */ 454 } 455 fs = VFSTOEXT2(mp)->um_e2fs; 456 bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs)); 457 458 if((error = compute_sb_data(devvp, es, fs)) != 0) { 459 brelse(bp); 460 return (error); 461 } 462 #ifdef UNKLAR 463 if (fs->fs_sbsize < SBSIZE) 464 bp->b_flags |= B_INVAL; 465 #endif 466 brelse(bp); 467 468 /* 469 * Step 3: invalidate all cluster summary information. 470 */ 471 if (fs->e2fs_contigsumsize > 0) { 472 lp = fs->e2fs_maxcluster; 473 sump = fs->e2fs_clustersum; 474 for (i = 0; i < fs->e2fs_gcount; i++, sump++) { 475 *lp++ = fs->e2fs_contigsumsize; 476 sump->cs_init = 0; 477 bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1); 478 } 479 } 480 481 loop: 482 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 483 /* 484 * Step 4: invalidate all cached file data. 485 */ 486 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 487 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 488 goto loop; 489 } 490 if (vinvalbuf(vp, 0, 0, 0)) 491 panic("ext2_reload: dirty2"); 492 493 /* 494 * Step 5: re-read inode data for all active vnodes. 495 */ 496 ip = VTOI(vp); 497 error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), 498 (int)fs->e2fs_bsize, NOCRED, &bp); 499 if (error) { 500 VOP_UNLOCK(vp, 0); 501 vrele(vp); 502 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 503 return (error); 504 } 505 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + 506 EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip); 507 brelse(bp); 508 VOP_UNLOCK(vp, 0); 509 vrele(vp); 510 } 511 return (0); 512 } 513 514 /* 515 * Common code for mount and mountroot. 516 */ 517 static int 518 ext2_mountfs(struct vnode *devvp, struct mount *mp) 519 { 520 struct ext2mount *ump; 521 struct buf *bp; 522 struct m_ext2fs *fs; 523 struct ext2fs *es; 524 struct cdev *dev = devvp->v_rdev; 525 struct g_consumer *cp; 526 struct bufobj *bo; 527 struct csum *sump; 528 int error; 529 int ronly; 530 int i; 531 u_long size; 532 int32_t *lp; 533 int32_t e2fs_maxcontig; 534 535 ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0); 536 /* XXX: use VOP_ACESS to check FS perms */ 537 DROP_GIANT(); 538 g_topology_lock(); 539 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 540 g_topology_unlock(); 541 PICKUP_GIANT(); 542 VOP_UNLOCK(devvp, 0); 543 if (error) 544 return (error); 545 546 /* XXX: should we check for some sectorsize or 512 instead? */ 547 if (((SBSIZE % cp->provider->sectorsize) != 0) || 548 (SBSIZE < cp->provider->sectorsize)) { 549 DROP_GIANT(); 550 g_topology_lock(); 551 g_vfs_close(cp); 552 g_topology_unlock(); 553 PICKUP_GIANT(); 554 return (EINVAL); 555 } 556 557 bo = &devvp->v_bufobj; 558 bo->bo_private = cp; 559 bo->bo_ops = g_vfs_bufops; 560 if (devvp->v_rdev->si_iosize_max != 0) 561 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 562 if (mp->mnt_iosize_max > MAXPHYS) 563 mp->mnt_iosize_max = MAXPHYS; 564 565 bp = NULL; 566 ump = NULL; 567 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 568 goto out; 569 es = (struct ext2fs *)bp->b_data; 570 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 571 error = EINVAL; /* XXX needs translation */ 572 goto out; 573 } 574 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 575 (es->e2fs_state & E2FS_ERRORS)) { 576 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 577 printf( 578 "WARNING: Filesystem was not properly dismounted\n"); 579 } else { 580 printf( 581 "WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 582 error = EPERM; 583 goto out; 584 } 585 } 586 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 587 588 /* 589 * I don't know whether this is the right strategy. Note that 590 * we dynamically allocate both an m_ext2fs and an ext2fs 591 * while Linux keeps the super block in a locked buffer. 592 */ 593 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 594 M_EXT2MNT, M_WAITOK | M_ZERO); 595 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 596 M_EXT2MNT, M_WAITOK); 597 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 598 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 599 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 600 goto out; 601 602 /* 603 * Calculate the maximum contiguous blocks and size of cluster summary 604 * array. In FFS this is done by newfs; however, the superblock 605 * in ext2fs doesn't have these variables, so we can calculate 606 * them here. 607 */ 608 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 609 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 610 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 611 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 612 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 613 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 614 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 615 lp = ump->um_e2fs->e2fs_maxcluster; 616 sump = ump->um_e2fs->e2fs_clustersum; 617 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 618 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 619 sump->cs_init = 0; 620 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 621 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 622 } 623 } 624 625 brelse(bp); 626 bp = NULL; 627 fs = ump->um_e2fs; 628 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 629 630 /* 631 * If the fs is not mounted read-only, make sure the super block is 632 * always written back on a sync(). 633 */ 634 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 635 if (ronly == 0) { 636 fs->e2fs_fmod = 1; /* mark it modified */ 637 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 638 } 639 mp->mnt_data = ump; 640 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 641 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 642 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 643 MNT_ILOCK(mp); 644 mp->mnt_flag |= MNT_LOCAL; 645 MNT_IUNLOCK(mp); 646 ump->um_mountp = mp; 647 ump->um_dev = dev; 648 ump->um_devvp = devvp; 649 ump->um_bo = &devvp->v_bufobj; 650 ump->um_cp = cp; 651 652 /* 653 * Setting those two parameters allowed us to use 654 * ufs_bmap w/o changse! 655 */ 656 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 657 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 658 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 659 if (ronly == 0) 660 ext2_sbupdate(ump, MNT_WAIT); 661 /* 662 * Initialize filesystem stat information in mount struct. 663 */ 664 MNT_ILOCK(mp); 665 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED | 666 MNTK_EXTENDED_SHARED; 667 MNT_IUNLOCK(mp); 668 return (0); 669 out: 670 if (bp) 671 brelse(bp); 672 if (cp != NULL) { 673 DROP_GIANT(); 674 g_topology_lock(); 675 g_vfs_close(cp); 676 g_topology_unlock(); 677 PICKUP_GIANT(); 678 } 679 if (ump) { 680 mtx_destroy(EXT2_MTX(ump)); 681 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 682 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 683 free(ump->um_e2fs->e2fs, M_EXT2MNT); 684 free(ump->um_e2fs, M_EXT2MNT); 685 free(ump, M_EXT2MNT); 686 mp->mnt_data = NULL; 687 } 688 return (error); 689 } 690 691 /* 692 * Unmount system call. 693 */ 694 static int 695 ext2_unmount(struct mount *mp, int mntflags) 696 { 697 struct ext2mount *ump; 698 struct m_ext2fs *fs; 699 struct csum *sump; 700 int error, flags, i, ronly; 701 702 flags = 0; 703 if (mntflags & MNT_FORCE) { 704 if (mp->mnt_flag & MNT_ROOTFS) 705 return (EINVAL); 706 flags |= FORCECLOSE; 707 } 708 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 709 return (error); 710 ump = VFSTOEXT2(mp); 711 fs = ump->um_e2fs; 712 ronly = fs->e2fs_ronly; 713 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 714 if (fs->e2fs_wasvalid) 715 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 716 ext2_sbupdate(ump, MNT_WAIT); 717 } 718 719 DROP_GIANT(); 720 g_topology_lock(); 721 g_vfs_close(ump->um_cp); 722 g_topology_unlock(); 723 PICKUP_GIANT(); 724 vrele(ump->um_devvp); 725 sump = fs->e2fs_clustersum; 726 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 727 free(sump->cs_sum, M_EXT2MNT); 728 free(fs->e2fs_clustersum, M_EXT2MNT); 729 free(fs->e2fs_maxcluster, M_EXT2MNT); 730 free(fs->e2fs_gd, M_EXT2MNT); 731 free(fs->e2fs_contigdirs, M_EXT2MNT); 732 free(fs->e2fs, M_EXT2MNT); 733 free(fs, M_EXT2MNT); 734 free(ump, M_EXT2MNT); 735 mp->mnt_data = NULL; 736 MNT_ILOCK(mp); 737 mp->mnt_flag &= ~MNT_LOCAL; 738 MNT_IUNLOCK(mp); 739 return (error); 740 } 741 742 /* 743 * Flush out all the files in a filesystem. 744 */ 745 static int 746 ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 747 { 748 int error; 749 750 error = vflush(mp, 0, flags, td); 751 return (error); 752 } 753 /* 754 * Get filesystem statistics. 755 */ 756 int 757 ext2_statfs(struct mount *mp, struct statfs *sbp) 758 { 759 struct ext2mount *ump; 760 struct m_ext2fs *fs; 761 uint32_t overhead, overhead_per_group, ngdb; 762 int i, ngroups; 763 764 ump = VFSTOEXT2(mp); 765 fs = ump->um_e2fs; 766 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 767 panic("ext2_statfs"); 768 769 /* 770 * Compute the overhead (FS structures) 771 */ 772 overhead_per_group = 773 1 /* block bitmap */ + 774 1 /* inode bitmap */ + 775 fs->e2fs_itpg; 776 overhead = fs->e2fs->e2fs_first_dblock + 777 fs->e2fs_gcount * overhead_per_group; 778 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 779 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 780 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 781 if (cg_has_sb(i)) 782 ngroups++; 783 } 784 } else { 785 ngroups = fs->e2fs_gcount; 786 } 787 ngdb = fs->e2fs_gdbcount; 788 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 789 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 790 ngdb += fs->e2fs->e2fs_reserved_ngdb; 791 overhead += ngroups * (1 /* superblock */ + ngdb); 792 793 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 794 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 795 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 796 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 797 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 798 sbp->f_files = fs->e2fs->e2fs_icount; 799 sbp->f_ffree = fs->e2fs->e2fs_ficount; 800 return (0); 801 } 802 803 /* 804 * Go through the disk queues to initiate sandbagged IO; 805 * go through the inodes to write those that have been modified; 806 * initiate the writing of the super block if it has been modified. 807 * 808 * Note: we are always called with the filesystem marked `MPBUSY'. 809 */ 810 static int 811 ext2_sync(struct mount *mp, int waitfor) 812 { 813 struct vnode *mvp, *vp; 814 struct thread *td; 815 struct inode *ip; 816 struct ext2mount *ump = VFSTOEXT2(mp); 817 struct m_ext2fs *fs; 818 int error, allerror = 0; 819 820 td = curthread; 821 fs = ump->um_e2fs; 822 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 823 printf("fs = %s\n", fs->e2fs_fsmnt); 824 panic("ext2_sync: rofs mod"); 825 } 826 827 /* 828 * Write back each (modified) inode. 829 */ 830 loop: 831 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 832 if (vp->v_type == VNON) { 833 VI_UNLOCK(vp); 834 continue; 835 } 836 ip = VTOI(vp); 837 if ((ip->i_flag & 838 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 839 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 840 waitfor == MNT_LAZY)) { 841 VI_UNLOCK(vp); 842 continue; 843 } 844 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 845 if (error) { 846 if (error == ENOENT) { 847 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 848 goto loop; 849 } 850 continue; 851 } 852 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 853 allerror = error; 854 VOP_UNLOCK(vp, 0); 855 vrele(vp); 856 } 857 858 /* 859 * Force stale filesystem control information to be flushed. 860 */ 861 if (waitfor != MNT_LAZY) { 862 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 863 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 864 allerror = error; 865 VOP_UNLOCK(ump->um_devvp, 0); 866 } 867 868 /* 869 * Write back modified superblock. 870 */ 871 if (fs->e2fs_fmod != 0) { 872 fs->e2fs_fmod = 0; 873 fs->e2fs->e2fs_wtime = time_second; 874 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 875 allerror = error; 876 } 877 return (allerror); 878 } 879 880 /* 881 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 882 * in from disk. If it is in core, wait for the lock bit to clear, then 883 * return the inode locked. Detection and handling of mount points must be 884 * done by the calling routine. 885 */ 886 static int 887 ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 888 { 889 struct m_ext2fs *fs; 890 struct inode *ip; 891 struct ext2mount *ump; 892 struct buf *bp; 893 struct vnode *vp; 894 struct thread *td; 895 int i, error; 896 int used_blocks; 897 898 td = curthread; 899 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 900 if (error || *vpp != NULL) 901 return (error); 902 903 ump = VFSTOEXT2(mp); 904 905 /* 906 * If this malloc() is performed after the getnewvnode() 907 * it might block, leaving a vnode with a NULL v_data to be 908 * found by ext2_sync() if a sync happens to fire right then, 909 * which will cause a panic because ext2_sync() blindly 910 * dereferences vp->v_data (as well it should). 911 */ 912 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 913 914 /* Allocate a new vnode/inode. */ 915 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 916 *vpp = NULL; 917 free(ip, M_EXT2NODE); 918 return (error); 919 } 920 vp->v_data = ip; 921 ip->i_vnode = vp; 922 ip->i_e2fs = fs = ump->um_e2fs; 923 ip->i_ump = ump; 924 ip->i_number = ino; 925 926 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 927 error = insmntque(vp, mp); 928 if (error != 0) { 929 free(ip, M_EXT2NODE); 930 *vpp = NULL; 931 return (error); 932 } 933 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 934 if (error || *vpp != NULL) 935 return (error); 936 937 /* Read in the disk contents for the inode, copy into the inode. */ 938 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 939 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 940 /* 941 * The inode does not contain anything useful, so it would 942 * be misleading to leave it on its hash chain. With mode 943 * still zero, it will be unlinked and returned to the free 944 * list by vput(). 945 */ 946 brelse(bp); 947 vput(vp); 948 *vpp = NULL; 949 return (error); 950 } 951 /* convert ext2 inode to dinode */ 952 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 953 ino_to_fsbo(fs, ino)), ip); 954 ip->i_block_group = ino_to_cg(fs, ino); 955 ip->i_next_alloc_block = 0; 956 ip->i_next_alloc_goal = 0; 957 958 /* 959 * Now we want to make sure that block pointers for unused 960 * blocks are zeroed out - ext2_balloc depends on this 961 * although for regular files and directories only 962 * 963 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed 964 * out because we could corrupt the extent tree. 965 */ 966 if (!(ip->i_flag & IN_E4EXTENTS) && 967 (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) { 968 used_blocks = howmany(ip->i_size, fs->e2fs_bsize); 969 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 970 ip->i_db[i] = 0; 971 } 972 #ifdef EXT2FS_DEBUG 973 ext2_print_inode(ip); 974 #endif 975 bqrelse(bp); 976 977 /* 978 * Initialize the vnode from the inode, check for aliases. 979 * Note that the underlying vnode may have changed. 980 */ 981 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 982 vput(vp); 983 *vpp = NULL; 984 return (error); 985 } 986 987 /* 988 * Finish inode initialization. 989 */ 990 991 /* 992 * Set up a generation number for this inode if it does not 993 * already have one. This should only happen on old filesystems. 994 */ 995 if (ip->i_gen == 0) { 996 ip->i_gen = random() + 1; 997 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 998 ip->i_flag |= IN_MODIFIED; 999 } 1000 *vpp = vp; 1001 return (0); 1002 } 1003 1004 /* 1005 * File handle to vnode 1006 * 1007 * Have to be really careful about stale file handles: 1008 * - check that the inode number is valid 1009 * - call ext2_vget() to get the locked inode 1010 * - check for an unallocated inode (i_mode == 0) 1011 * - check that the given client host has export rights and return 1012 * those rights via. exflagsp and credanonp 1013 */ 1014 static int 1015 ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1016 { 1017 struct inode *ip; 1018 struct ufid *ufhp; 1019 struct vnode *nvp; 1020 struct m_ext2fs *fs; 1021 int error; 1022 1023 ufhp = (struct ufid *)fhp; 1024 fs = VFSTOEXT2(mp)->um_e2fs; 1025 if (ufhp->ufid_ino < EXT2_ROOTINO || 1026 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1027 return (ESTALE); 1028 1029 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1030 if (error) { 1031 *vpp = NULLVP; 1032 return (error); 1033 } 1034 ip = VTOI(nvp); 1035 if (ip->i_mode == 0 || 1036 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1037 vput(nvp); 1038 *vpp = NULLVP; 1039 return (ESTALE); 1040 } 1041 *vpp = nvp; 1042 vnode_create_vobject(*vpp, 0, curthread); 1043 return (0); 1044 } 1045 1046 /* 1047 * Write a superblock and associated information back to disk. 1048 */ 1049 static int 1050 ext2_sbupdate(struct ext2mount *mp, int waitfor) 1051 { 1052 struct m_ext2fs *fs = mp->um_e2fs; 1053 struct ext2fs *es = fs->e2fs; 1054 struct buf *bp; 1055 int error = 0; 1056 1057 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1058 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1059 if (waitfor == MNT_WAIT) 1060 error = bwrite(bp); 1061 else 1062 bawrite(bp); 1063 1064 /* 1065 * The buffers for group descriptors, inode bitmaps and block bitmaps 1066 * are not busy at this point and are (hopefully) written by the 1067 * usual sync mechanism. No need to write them here. 1068 */ 1069 return (error); 1070 } 1071 int 1072 ext2_cgupdate(struct ext2mount *mp, int waitfor) 1073 { 1074 struct m_ext2fs *fs = mp->um_e2fs; 1075 struct buf *bp; 1076 int i, error = 0, allerror = 0; 1077 1078 allerror = ext2_sbupdate(mp, waitfor); 1079 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1080 bp = getblk(mp->um_devvp, fsbtodb(fs, 1081 fs->e2fs->e2fs_first_dblock + 1082 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1083 e2fs_cgsave(&fs->e2fs_gd[ 1084 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1085 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1086 if (waitfor == MNT_WAIT) 1087 error = bwrite(bp); 1088 else 1089 bawrite(bp); 1090 } 1091 1092 if (!allerror && error) 1093 allerror = error; 1094 return (allerror); 1095 } 1096 /* 1097 * Return the root of a filesystem. 1098 */ 1099 static int 1100 ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1101 { 1102 struct vnode *nvp; 1103 int error; 1104 1105 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1106 if (error) 1107 return (error); 1108 *vpp = nvp; 1109 return (0); 1110 }
Cache object: b42d8733df52bbe939000cc8a07d9c14
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