ext2_vfsops.c revision 252890
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: head/sys/fs/ext2fs/ext2_vfsops.c 252890 2013-07-06 18:28:06Z 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 67static int ext2_flushfiles(struct mount *mp, int flags, struct thread *td); 68static int ext2_mountfs(struct vnode *, struct mount *); 69static int ext2_reload(struct mount *mp, struct thread *td); 70static int ext2_sbupdate(struct ext2mount *, int); 71static int ext2_cgupdate(struct ext2mount *, int); 72static vfs_unmount_t ext2_unmount; 73static vfs_root_t ext2_root; 74static vfs_statfs_t ext2_statfs; 75static vfs_sync_t ext2_sync; 76static vfs_vget_t ext2_vget; 77static vfs_fhtovp_t ext2_fhtovp; 78static vfs_mount_t ext2_mount; 79 80MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part"); 81static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure"); 82 83static 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 93VFS_SET(ext2fs_vfsops, ext2fs, 0); 94 95static int ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, 96 int ronly); 97static int compute_sb_data(struct vnode * devvp, 98 struct ext2fs * es, struct m_ext2fs * fs); 99 100static 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 */ 109static int 110ext2_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 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 283static int 284ext2_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 */ 313static int 314compute_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; 402 403 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 */ 431static int 432ext2_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 491loop: 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 */ 527static int 528ext2_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 DROP_GIANT(); 547 g_topology_lock(); 548 error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1); 549 g_topology_unlock(); 550 PICKUP_GIANT(); 551 VOP_UNLOCK(devvp, 0); 552 if (error) 553 return (error); 554 555 /* XXX: should we check for some sectorsize or 512 instead? */ 556 if (((SBSIZE % cp->provider->sectorsize) != 0) || 557 (SBSIZE < cp->provider->sectorsize)) { 558 DROP_GIANT(); 559 g_topology_lock(); 560 g_vfs_close(cp); 561 g_topology_unlock(); 562 PICKUP_GIANT(); 563 return (EINVAL); 564 } 565 566 bo = &devvp->v_bufobj; 567 bo->bo_private = cp; 568 bo->bo_ops = g_vfs_bufops; 569 if (devvp->v_rdev->si_iosize_max != 0) 570 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 571 if (mp->mnt_iosize_max > MAXPHYS) 572 mp->mnt_iosize_max = MAXPHYS; 573 574 bp = NULL; 575 ump = NULL; 576 if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0) 577 goto out; 578 es = (struct ext2fs *)bp->b_data; 579 if (ext2_check_sb_compat(es, dev, ronly) != 0) { 580 error = EINVAL; /* XXX needs translation */ 581 goto out; 582 } 583 if ((es->e2fs_state & E2FS_ISCLEAN) == 0 || 584 (es->e2fs_state & E2FS_ERRORS)) { 585 if (ronly || (mp->mnt_flag & MNT_FORCE)) { 586 printf( 587"WARNING: Filesystem was not properly dismounted\n"); 588 } else { 589 printf( 590"WARNING: R/W mount denied. Filesystem is not clean - run fsck\n"); 591 error = EPERM; 592 goto out; 593 } 594 } 595 ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO); 596 597 /* 598 * I don't know whether this is the right strategy. Note that 599 * we dynamically allocate both an ext2_sb_info and an ext2_super_block 600 * while Linux keeps the super block in a locked buffer. 601 */ 602 ump->um_e2fs = malloc(sizeof(struct m_ext2fs), 603 M_EXT2MNT, M_WAITOK); 604 ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs), 605 M_EXT2MNT, M_WAITOK); 606 mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF); 607 bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs)); 608 if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) 609 goto out; 610 611 /* 612 * Calculate the maximum contiguous blocks and size of cluster summary 613 * array. In FFS this is done by newfs; however, the superblock 614 * in ext2fs doesn't have these variables, so we can calculate 615 * them here. 616 */ 617 e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize); 618 ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG); 619 if (ump->um_e2fs->e2fs_contigsumsize > 0) { 620 size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t); 621 ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK); 622 size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum); 623 ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK); 624 lp = ump->um_e2fs->e2fs_maxcluster; 625 sump = ump->um_e2fs->e2fs_clustersum; 626 for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) { 627 *lp++ = ump->um_e2fs->e2fs_contigsumsize; 628 sump->cs_init = 0; 629 sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) * 630 sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO); 631 } 632 } 633 634 brelse(bp); 635 bp = NULL; 636 fs = ump->um_e2fs; 637 fs->e2fs_ronly = ronly; /* ronly is set according to mnt_flags */ 638 639 /* 640 * If the fs is not mounted read-only, make sure the super block is 641 * always written back on a sync(). 642 */ 643 fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0; 644 if (ronly == 0) { 645 fs->e2fs_fmod = 1; /* mark it modified */ 646 fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN; /* set fs invalid */ 647 } 648 mp->mnt_data = ump; 649 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 650 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 651 mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN; 652 MNT_ILOCK(mp); 653 mp->mnt_flag |= MNT_LOCAL; 654 MNT_IUNLOCK(mp); 655 ump->um_mountp = mp; 656 ump->um_dev = dev; 657 ump->um_devvp = devvp; 658 ump->um_bo = &devvp->v_bufobj; 659 ump->um_cp = cp; 660 661 /* 662 * Setting those two parameters allowed us to use 663 * ufs_bmap w/o changse! 664 */ 665 ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs); 666 ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1; 667 ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs); 668 if (ronly == 0) 669 ext2_sbupdate(ump, MNT_WAIT); 670 /* 671 * Initialize filesystem stat information in mount struct. 672 */ 673 MNT_ILOCK(mp); 674 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED; 675 MNT_IUNLOCK(mp); 676 return (0); 677out: 678 if (bp) 679 brelse(bp); 680 if (cp != NULL) { 681 DROP_GIANT(); 682 g_topology_lock(); 683 g_vfs_close(cp); 684 g_topology_unlock(); 685 PICKUP_GIANT(); 686 } 687 if (ump) { 688 mtx_destroy(EXT2_MTX(ump)); 689 free(ump->um_e2fs->e2fs_gd, M_EXT2MNT); 690 free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT); 691 free(ump->um_e2fs->e2fs, M_EXT2MNT); 692 free(ump->um_e2fs, M_EXT2MNT); 693 free(ump, M_EXT2MNT); 694 mp->mnt_data = NULL; 695 } 696 return (error); 697} 698 699/* 700 * Unmount system call. 701 */ 702static int 703ext2_unmount(struct mount *mp, int mntflags) 704{ 705 struct ext2mount *ump; 706 struct m_ext2fs *fs; 707 struct csum *sump; 708 int error, flags, i, ronly; 709 710 flags = 0; 711 if (mntflags & MNT_FORCE) { 712 if (mp->mnt_flag & MNT_ROOTFS) 713 return (EINVAL); 714 flags |= FORCECLOSE; 715 } 716 if ((error = ext2_flushfiles(mp, flags, curthread)) != 0) 717 return (error); 718 ump = VFSTOEXT2(mp); 719 fs = ump->um_e2fs; 720 ronly = fs->e2fs_ronly; 721 if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) { 722 if (fs->e2fs_wasvalid) 723 fs->e2fs->e2fs_state |= E2FS_ISCLEAN; 724 ext2_sbupdate(ump, MNT_WAIT); 725 } 726 727 DROP_GIANT(); 728 g_topology_lock(); 729 g_vfs_close(ump->um_cp); 730 g_topology_unlock(); 731 PICKUP_GIANT(); 732 vrele(ump->um_devvp); 733 sump = fs->e2fs_clustersum; 734 for (i = 0; i < fs->e2fs_gcount; i++, sump++) 735 free(sump->cs_sum, M_EXT2MNT); 736 free(fs->e2fs_clustersum, M_EXT2MNT); 737 free(fs->e2fs_maxcluster, M_EXT2MNT); 738 free(fs->e2fs_gd, M_EXT2MNT); 739 free(fs->e2fs_contigdirs, M_EXT2MNT); 740 free(fs->e2fs, M_EXT2MNT); 741 free(fs, M_EXT2MNT); 742 free(ump, M_EXT2MNT); 743 mp->mnt_data = NULL; 744 MNT_ILOCK(mp); 745 mp->mnt_flag &= ~MNT_LOCAL; 746 MNT_IUNLOCK(mp); 747 return (error); 748} 749 750/* 751 * Flush out all the files in a filesystem. 752 */ 753static int 754ext2_flushfiles(struct mount *mp, int flags, struct thread *td) 755{ 756 int error; 757 758 error = vflush(mp, 0, flags, td); 759 return (error); 760} 761/* 762 * Get filesystem statistics. 763 */ 764int 765ext2_statfs(struct mount *mp, struct statfs *sbp) 766{ 767 struct ext2mount *ump; 768 struct m_ext2fs *fs; 769 uint32_t overhead, overhead_per_group, ngdb; 770 int i, ngroups; 771 772 ump = VFSTOEXT2(mp); 773 fs = ump->um_e2fs; 774 if (fs->e2fs->e2fs_magic != E2FS_MAGIC) 775 panic("ext2_statfs"); 776 777 /* 778 * Compute the overhead (FS structures) 779 */ 780 overhead_per_group = 781 1 /* block bitmap */ + 782 1 /* inode bitmap */ + 783 fs->e2fs_itpg; 784 overhead = fs->e2fs->e2fs_first_dblock + 785 fs->e2fs_gcount * overhead_per_group; 786 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 787 fs->e2fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) { 788 for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) { 789 if (cg_has_sb(i)) 790 ngroups++; 791 } 792 } else { 793 ngroups = fs->e2fs_gcount; 794 } 795 ngdb = fs->e2fs_gdbcount; 796 if (fs->e2fs->e2fs_rev > E2FS_REV0 && 797 fs->e2fs->e2fs_features_compat & EXT2F_COMPAT_RESIZE) 798 ngdb += fs->e2fs->e2fs_reserved_ngdb; 799 overhead += ngroups * (1 /* superblock */ + ngdb); 800 801 sbp->f_bsize = EXT2_FRAG_SIZE(fs); 802 sbp->f_iosize = EXT2_BLOCK_SIZE(fs); 803 sbp->f_blocks = fs->e2fs->e2fs_bcount - overhead; 804 sbp->f_bfree = fs->e2fs->e2fs_fbcount; 805 sbp->f_bavail = sbp->f_bfree - fs->e2fs->e2fs_rbcount; 806 sbp->f_files = fs->e2fs->e2fs_icount; 807 sbp->f_ffree = fs->e2fs->e2fs_ficount; 808 return (0); 809} 810 811/* 812 * Go through the disk queues to initiate sandbagged IO; 813 * go through the inodes to write those that have been modified; 814 * initiate the writing of the super block if it has been modified. 815 * 816 * Note: we are always called with the filesystem marked `MPBUSY'. 817 */ 818static int 819ext2_sync(struct mount *mp, int waitfor) 820{ 821 struct vnode *mvp, *vp; 822 struct thread *td; 823 struct inode *ip; 824 struct ext2mount *ump = VFSTOEXT2(mp); 825 struct m_ext2fs *fs; 826 int error, allerror = 0; 827 828 td = curthread; 829 fs = ump->um_e2fs; 830 if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */ 831 printf("fs = %s\n", fs->e2fs_fsmnt); 832 panic("ext2_sync: rofs mod"); 833 } 834 835 /* 836 * Write back each (modified) inode. 837 */ 838loop: 839 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 840 if (vp->v_type == VNON) { 841 VI_UNLOCK(vp); 842 continue; 843 } 844 ip = VTOI(vp); 845 if ((ip->i_flag & 846 (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 && 847 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 848 waitfor == MNT_LAZY)) { 849 VI_UNLOCK(vp); 850 continue; 851 } 852 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 853 if (error) { 854 if (error == ENOENT) { 855 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 856 goto loop; 857 } 858 continue; 859 } 860 if ((error = VOP_FSYNC(vp, waitfor, td)) != 0) 861 allerror = error; 862 VOP_UNLOCK(vp, 0); 863 vrele(vp); 864 } 865 866 /* 867 * Force stale filesystem control information to be flushed. 868 */ 869 if (waitfor != MNT_LAZY) { 870 vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY); 871 if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0) 872 allerror = error; 873 VOP_UNLOCK(ump->um_devvp, 0); 874 } 875 876 /* 877 * Write back modified superblock. 878 */ 879 if (fs->e2fs_fmod != 0) { 880 fs->e2fs_fmod = 0; 881 fs->e2fs->e2fs_wtime = time_second; 882 if ((error = ext2_cgupdate(ump, waitfor)) != 0) 883 allerror = error; 884 } 885 return (allerror); 886} 887 888/* 889 * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it 890 * in from disk. If it is in core, wait for the lock bit to clear, then 891 * return the inode locked. Detection and handling of mount points must be 892 * done by the calling routine. 893 */ 894static int 895ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 896{ 897 struct m_ext2fs *fs; 898 struct inode *ip; 899 struct ext2mount *ump; 900 struct buf *bp; 901 struct vnode *vp; 902 struct cdev *dev; 903 struct thread *td; 904 int i, error; 905 int used_blocks; 906 907 td = curthread; 908 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 909 if (error || *vpp != NULL) 910 return (error); 911 912 ump = VFSTOEXT2(mp); 913 dev = ump->um_dev; 914 ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO); 915 916 /* Allocate a new vnode/inode. */ 917 if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) { 918 *vpp = NULL; 919 free(ip, M_EXT2NODE); 920 return (error); 921 } 922 vp->v_data = ip; 923 ip->i_vnode = vp; 924 ip->i_e2fs = fs = ump->um_e2fs; 925 ip->i_ump = ump; 926 ip->i_number = ino; 927 928 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 929 error = insmntque(vp, mp); 930 if (error != 0) { 931 free(ip, M_EXT2NODE); 932 *vpp = NULL; 933 return (error); 934 } 935 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 936 if (error || *vpp != NULL) 937 return (error); 938 939 /* Read in the disk contents for the inode, copy into the inode. */ 940 if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)), 941 (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) { 942 /* 943 * The inode does not contain anything useful, so it would 944 * be misleading to leave it on its hash chain. With mode 945 * still zero, it will be unlinked and returned to the free 946 * list by vput(). 947 */ 948 brelse(bp); 949 vput(vp); 950 *vpp = NULL; 951 return (error); 952 } 953 /* convert ext2 inode to dinode */ 954 ext2_ei2i((struct ext2fs_dinode *) ((char *)bp->b_data + EXT2_INODE_SIZE(fs) * 955 ino_to_fsbo(fs, ino)), ip); 956 ip->i_block_group = ino_to_cg(fs, ino); 957 ip->i_next_alloc_block = 0; 958 ip->i_next_alloc_goal = 0; 959 960 /* 961 * Now we want to make sure that block pointers for unused 962 * blocks are zeroed out - ext2_balloc depends on this 963 * although for regular files and directories only 964 */ 965 if(S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode)) { 966 used_blocks = (ip->i_size+fs->e2fs_bsize-1) / fs->e2fs_bsize; 967 for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++) 968 ip->i_db[i] = 0; 969 } 970/* 971 ext2_print_inode(ip); 972*/ 973 bqrelse(bp); 974 975 /* 976 * Initialize the vnode from the inode, check for aliases. 977 * Note that the underlying vnode may have changed. 978 */ 979 if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) { 980 vput(vp); 981 *vpp = NULL; 982 return (error); 983 } 984 985 /* 986 * Finish inode initialization. 987 */ 988 989 /* 990 * Set up a generation number for this inode if it does not 991 * already have one. This should only happen on old filesystems. 992 */ 993 if (ip->i_gen == 0) { 994 ip->i_gen = random() + 1; 995 if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) 996 ip->i_flag |= IN_MODIFIED; 997 } 998 *vpp = vp; 999 return (0); 1000} 1001 1002/* 1003 * File handle to vnode 1004 * 1005 * Have to be really careful about stale file handles: 1006 * - check that the inode number is valid 1007 * - call ext2_vget() to get the locked inode 1008 * - check for an unallocated inode (i_mode == 0) 1009 * - check that the given client host has export rights and return 1010 * those rights via. exflagsp and credanonp 1011 */ 1012static int 1013ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1014{ 1015 struct inode *ip; 1016 struct ufid *ufhp; 1017 struct vnode *nvp; 1018 struct m_ext2fs *fs; 1019 int error; 1020 1021 ufhp = (struct ufid *)fhp; 1022 fs = VFSTOEXT2(mp)->um_e2fs; 1023 if (ufhp->ufid_ino < EXT2_ROOTINO || 1024 ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg) 1025 return (ESTALE); 1026 1027 error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp); 1028 if (error) { 1029 *vpp = NULLVP; 1030 return (error); 1031 } 1032 ip = VTOI(nvp); 1033 if (ip->i_mode == 0 || 1034 ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) { 1035 vput(nvp); 1036 *vpp = NULLVP; 1037 return (ESTALE); 1038 } 1039 *vpp = nvp; 1040 vnode_create_vobject(*vpp, 0, curthread); 1041 return (0); 1042} 1043 1044/* 1045 * Write a superblock and associated information back to disk. 1046 */ 1047static int 1048ext2_sbupdate(struct ext2mount *mp, int waitfor) 1049{ 1050 struct m_ext2fs *fs = mp->um_e2fs; 1051 struct ext2fs *es = fs->e2fs; 1052 struct buf *bp; 1053 int error = 0; 1054 1055 bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0); 1056 bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs)); 1057 if (waitfor == MNT_WAIT) 1058 error = bwrite(bp); 1059 else 1060 bawrite(bp); 1061 1062 /* 1063 * The buffers for group descriptors, inode bitmaps and block bitmaps 1064 * are not busy at this point and are (hopefully) written by the 1065 * usual sync mechanism. No need to write them here. 1066 */ 1067 return (error); 1068} 1069int 1070ext2_cgupdate(struct ext2mount *mp, int waitfor) 1071{ 1072 struct m_ext2fs *fs = mp->um_e2fs; 1073 struct buf *bp; 1074 int i, error = 0, allerror = 0; 1075 1076 allerror = ext2_sbupdate(mp, waitfor); 1077 for (i = 0; i < fs->e2fs_gdbcount; i++) { 1078 bp = getblk(mp->um_devvp, fsbtodb(fs, 1079 fs->e2fs->e2fs_first_dblock + 1080 1 /* superblock */ + i), fs->e2fs_bsize, 0, 0, 0); 1081 e2fs_cgsave(&fs->e2fs_gd[ 1082 i * fs->e2fs_bsize / sizeof(struct ext2_gd)], 1083 (struct ext2_gd *)bp->b_data, fs->e2fs_bsize); 1084 if (waitfor == MNT_WAIT) 1085 error = bwrite(bp); 1086 else 1087 bawrite(bp); 1088 } 1089 1090 if (!allerror && error) 1091 allerror = error; 1092 return (allerror); 1093} 1094/* 1095 * Return the root of a filesystem. 1096 */ 1097static int 1098ext2_root(struct mount *mp, int flags, struct vnode **vpp) 1099{ 1100 struct vnode *nvp; 1101 int error; 1102 1103 error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp); 1104 if (error) 1105 return (error); 1106 *vpp = nvp; 1107 return (0); 1108} 1109