super.c 19.2 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742
/*
 *  linux/fs/hpfs/super.c
 *
 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
 *
 *  mounting, unmounting, error handling
 */

#include "hpfs_fn.h"
#include <linux/module.h>
#include <linux/parser.h>
#include <linux/init.h>
#include <linux/statfs.h>
#include <linux/magic.h>
#include <linux/sched.h>
#include <linux/bitmap.h>
#include <linux/slab.h>

/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */

static void mark_dirty(struct super_block *s, int remount)
{
	if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) {
		struct buffer_head *bh;
		struct hpfs_spare_block *sb;
		if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
			sb->dirty = 1;
			sb->old_wrote = 0;
			mark_buffer_dirty(bh);
			sync_dirty_buffer(bh);
			brelse(bh);
		}
	}
}

/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
   were errors) */

static void unmark_dirty(struct super_block *s)
{
	struct buffer_head *bh;
	struct hpfs_spare_block *sb;
	if (s->s_flags & MS_RDONLY) return;
	sync_blockdev(s->s_bdev);
	if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
		sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
		sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
		mark_buffer_dirty(bh);
		sync_dirty_buffer(bh);
		brelse(bh);
	}
}

/* Filesystem error... */
static char err_buf[1024];

void hpfs_error(struct super_block *s, const char *fmt, ...)
{
	va_list args;

	va_start(args, fmt);
	vsnprintf(err_buf, sizeof(err_buf), fmt, args);
	va_end(args);

	printk("HPFS: filesystem error: %s", err_buf);
	if (!hpfs_sb(s)->sb_was_error) {
		if (hpfs_sb(s)->sb_err == 2) {
			printk("; crashing the system because you wanted it\n");
			mark_dirty(s, 0);
			panic("HPFS panic");
		} else if (hpfs_sb(s)->sb_err == 1) {
			if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
			else {
				printk("; remounting read-only\n");
				mark_dirty(s, 0);
				s->s_flags |= MS_RDONLY;
			}
		} else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
		else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
	} else printk("\n");
	hpfs_sb(s)->sb_was_error = 1;
}

/* 
 * A little trick to detect cycles in many hpfs structures and don't let the
 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
 *
 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
 * nested each in other, chkdsk locked up happilly.
 */

int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
		char *msg)
{
	if (*c2 && *c1 == key) {
		hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
		return 1;
	}
	(*c2)++;
	if (!((*c2 - 1) & *c2)) *c1 = key;
	return 0;
}

static void free_sbi(struct hpfs_sb_info *sbi)
{
	kfree(sbi->sb_cp_table);
	kfree(sbi->sb_bmp_dir);
	kfree(sbi);
}

static void lazy_free_sbi(struct rcu_head *rcu)
{
	free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
}

static void hpfs_put_super(struct super_block *s)
{
	hpfs_lock(s);
	unmark_dirty(s);
	hpfs_unlock(s);
	call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
}

static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
{
	struct quad_buffer_head qbh;
	unsigned long *bits;
	unsigned count;

	bits = hpfs_map_4sectors(s, secno, &qbh, 0);
	if (!bits)
		return (unsigned)-1;
	count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
	hpfs_brelse4(&qbh);
	return count;
}

static unsigned count_bitmaps(struct super_block *s)
{
	unsigned n, count, n_bands;
	n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
	count = 0;
	for (n = 0; n < COUNT_RD_AHEAD; n++) {
		hpfs_prefetch_bitmap(s, n);
	}
	for (n = 0; n < n_bands; n++) {
		unsigned c;
		hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
		c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
		if (c != (unsigned)-1)
			count += c;
	}
	return count;
}

unsigned hpfs_get_free_dnodes(struct super_block *s)
{
	struct hpfs_sb_info *sbi = hpfs_sb(s);
	if (sbi->sb_n_free_dnodes == (unsigned)-1) {
		unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
		if (c == (unsigned)-1)
			return 0;
		sbi->sb_n_free_dnodes = c;
	}
	return sbi->sb_n_free_dnodes;
}

static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *s = dentry->d_sb;
	struct hpfs_sb_info *sbi = hpfs_sb(s);
	u64 id = huge_encode_dev(s->s_bdev->bd_dev);

	hpfs_lock(s);

	if (sbi->sb_n_free == (unsigned)-1)
		sbi->sb_n_free = count_bitmaps(s);

	buf->f_type = s->s_magic;
	buf->f_bsize = 512;
	buf->f_blocks = sbi->sb_fs_size;
	buf->f_bfree = sbi->sb_n_free;
	buf->f_bavail = sbi->sb_n_free;
	buf->f_files = sbi->sb_dirband_size / 4;
	buf->f_ffree = hpfs_get_free_dnodes(s);
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);
	buf->f_namelen = 254;

	hpfs_unlock(s);

	return 0;
}

static struct kmem_cache * hpfs_inode_cachep;

static struct inode *hpfs_alloc_inode(struct super_block *sb)
{
	struct hpfs_inode_info *ei;
	ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
	if (!ei)
		return NULL;
	ei->vfs_inode.i_version = 1;
	return &ei->vfs_inode;
}

static void hpfs_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
}

static void hpfs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, hpfs_i_callback);
}

static void init_once(void *foo)
{
	struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;

	inode_init_once(&ei->vfs_inode);
}

static int init_inodecache(void)
{
	hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
					     sizeof(struct hpfs_inode_info),
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
					     init_once);
	if (hpfs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(hpfs_inode_cachep);
}

/*
 * A tiny parser for option strings, stolen from dosfs.
 * Stolen again from read-only hpfs.
 * And updated for table-driven option parsing.
 */

enum {
	Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
	Opt_check_none, Opt_check_normal, Opt_check_strict,
	Opt_err_cont, Opt_err_ro, Opt_err_panic,
	Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
	Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
	Opt_timeshift, Opt_err,
};

static const match_table_t tokens = {
	{Opt_help, "help"},
	{Opt_uid, "uid=%u"},
	{Opt_gid, "gid=%u"},
	{Opt_umask, "umask=%o"},
	{Opt_case_lower, "case=lower"},
	{Opt_case_asis, "case=asis"},
	{Opt_check_none, "check=none"},
	{Opt_check_normal, "check=normal"},
	{Opt_check_strict, "check=strict"},
	{Opt_err_cont, "errors=continue"},
	{Opt_err_ro, "errors=remount-ro"},
	{Opt_err_panic, "errors=panic"},
	{Opt_eas_no, "eas=no"},
	{Opt_eas_ro, "eas=ro"},
	{Opt_eas_rw, "eas=rw"},
	{Opt_chkdsk_no, "chkdsk=no"},
	{Opt_chkdsk_errors, "chkdsk=errors"},
	{Opt_chkdsk_always, "chkdsk=always"},
	{Opt_timeshift, "timeshift=%d"},
	{Opt_err, NULL},
};

static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
		      int *lowercase, int *eas, int *chk, int *errs,
		      int *chkdsk, int *timeshift)
{
	char *p;
	int option;

	if (!opts)
		return 1;

	/*printk("Parsing opts: '%s'\n",opts);*/

	while ((p = strsep(&opts, ",")) != NULL) {
		substring_t args[MAX_OPT_ARGS];
		int token;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_help:
			return 2;
		case Opt_uid:
			if (match_int(args, &option))
				return 0;
			*uid = make_kuid(current_user_ns(), option);
			if (!uid_valid(*uid))
				return 0;
			break;
		case Opt_gid:
			if (match_int(args, &option))
				return 0;
			*gid = make_kgid(current_user_ns(), option);
			if (!gid_valid(*gid))
				return 0;
			break;
		case Opt_umask:
			if (match_octal(args, &option))
				return 0;
			*umask = option;
			break;
		case Opt_case_lower:
			*lowercase = 1;
			break;
		case Opt_case_asis:
			*lowercase = 0;
			break;
		case Opt_check_none:
			*chk = 0;
			break;
		case Opt_check_normal:
			*chk = 1;
			break;
		case Opt_check_strict:
			*chk = 2;
			break;
		case Opt_err_cont:
			*errs = 0;
			break;
		case Opt_err_ro:
			*errs = 1;
			break;
		case Opt_err_panic:
			*errs = 2;
			break;
		case Opt_eas_no:
			*eas = 0;
			break;
		case Opt_eas_ro:
			*eas = 1;
			break;
		case Opt_eas_rw:
			*eas = 2;
			break;
		case Opt_chkdsk_no:
			*chkdsk = 0;
			break;
		case Opt_chkdsk_errors:
			*chkdsk = 1;
			break;
		case Opt_chkdsk_always:
			*chkdsk = 2;
			break;
		case Opt_timeshift:
		{
			int m = 1;
			char *rhs = args[0].from;
			if (!rhs || !*rhs)
				return 0;
			if (*rhs == '-') m = -1;
			if (*rhs == '+' || *rhs == '-') rhs++;
			*timeshift = simple_strtoul(rhs, &rhs, 0) * m;
			if (*rhs)
				return 0;
			break;
		}
		default:
			return 0;
		}
	}
	return 1;
}

static inline void hpfs_help(void)
{
	printk("\n\
HPFS filesystem options:\n\
      help              do not mount and display this text\n\
      uid=xxx           set uid of files that don't have uid specified in eas\n\
      gid=xxx           set gid of files that don't have gid specified in eas\n\
      umask=xxx         set mode of files that don't have mode specified in eas\n\
      case=lower        lowercase all files\n\
      case=asis         do not lowercase files (default)\n\
      check=none        no fs checks - kernel may crash on corrupted filesystem\n\
      check=normal      do some checks - it should not crash (default)\n\
      check=strict      do extra time-consuming checks, used for debugging\n\
      errors=continue   continue on errors\n\
      errors=remount-ro remount read-only if errors found (default)\n\
      errors=panic      panic on errors\n\
      chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
      chkdsk=errors     mark fs dirty if errors found (default)\n\
      chkdsk=always     always mark fs dirty - used for debugging\n\
      eas=no            ignore extended attributes\n\
      eas=ro            read but do not write extended attributes\n\
      eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
      timeshift=nnn	add nnn seconds to file times\n\
\n");
}

static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
{
	kuid_t uid;
	kgid_t gid;
	umode_t umask;
	int lowercase, eas, chk, errs, chkdsk, timeshift;
	int o;
	struct hpfs_sb_info *sbi = hpfs_sb(s);
	char *new_opts = kstrdup(data, GFP_KERNEL);
	
	*flags |= MS_NOATIME;
	
	hpfs_lock(s);
	uid = sbi->sb_uid; gid = sbi->sb_gid;
	umask = 0777 & ~sbi->sb_mode;
	lowercase = sbi->sb_lowercase;
	eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
	errs = sbi->sb_err; timeshift = sbi->sb_timeshift;

	if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
	    &eas, &chk, &errs, &chkdsk, &timeshift))) {
		printk("HPFS: bad mount options.\n");
		goto out_err;
	}
	if (o == 2) {
		hpfs_help();
		goto out_err;
	}
	if (timeshift != sbi->sb_timeshift) {
		printk("HPFS: timeshift can't be changed using remount.\n");
		goto out_err;
	}

	unmark_dirty(s);

	sbi->sb_uid = uid; sbi->sb_gid = gid;
	sbi->sb_mode = 0777 & ~umask;
	sbi->sb_lowercase = lowercase;
	sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
	sbi->sb_err = errs; sbi->sb_timeshift = timeshift;

	if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);

	replace_mount_options(s, new_opts);

	hpfs_unlock(s);
	return 0;

out_err:
	hpfs_unlock(s);
	kfree(new_opts);
	return -EINVAL;
}

/* Super operations */

static const struct super_operations hpfs_sops =
{
	.alloc_inode	= hpfs_alloc_inode,
	.destroy_inode	= hpfs_destroy_inode,
	.evict_inode	= hpfs_evict_inode,
	.put_super	= hpfs_put_super,
	.statfs		= hpfs_statfs,
	.remount_fs	= hpfs_remount_fs,
	.show_options	= generic_show_options,
};

static int hpfs_fill_super(struct super_block *s, void *options, int silent)
{
	struct buffer_head *bh0, *bh1, *bh2;
	struct hpfs_boot_block *bootblock;
	struct hpfs_super_block *superblock;
	struct hpfs_spare_block *spareblock;
	struct hpfs_sb_info *sbi;
	struct inode *root;

	kuid_t uid;
	kgid_t gid;
	umode_t umask;
	int lowercase, eas, chk, errs, chkdsk, timeshift;

	dnode_secno root_dno;
	struct hpfs_dirent *de = NULL;
	struct quad_buffer_head qbh;

	int o;

	save_mount_options(s, options);

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi) {
		return -ENOMEM;
	}
	s->s_fs_info = sbi;

	mutex_init(&sbi->hpfs_mutex);
	hpfs_lock(s);

	uid = current_uid();
	gid = current_gid();
	umask = current_umask();
	lowercase = 0;
	eas = 2;
	chk = 1;
	errs = 1;
	chkdsk = 1;
	timeshift = 0;

	if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
	    &eas, &chk, &errs, &chkdsk, &timeshift))) {
		printk("HPFS: bad mount options.\n");
		goto bail0;
	}
	if (o==2) {
		hpfs_help();
		goto bail0;
	}

	/*sbi->sb_mounting = 1;*/
	sb_set_blocksize(s, 512);
	sbi->sb_fs_size = -1;
	if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
	if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
	if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;

	/* Check magics */
	if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
	    ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
	    || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
		if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
		goto bail4;
	}

	/* Check version */
	if (!(s->s_flags & MS_RDONLY) &&
	      superblock->funcversion != 2 && superblock->funcversion != 3) {
		printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
			(int)superblock->version, (int)superblock->funcversion);
		printk("HPFS: please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n");
		goto bail4;
	}

	s->s_flags |= MS_NOATIME;

	/* Fill superblock stuff */
	s->s_magic = HPFS_SUPER_MAGIC;
	s->s_op = &hpfs_sops;
	s->s_d_op = &hpfs_dentry_operations;

	sbi->sb_root = le32_to_cpu(superblock->root);
	sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
	sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
	sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
	sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
	sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
	sbi->sb_uid = uid;
	sbi->sb_gid = gid;
	sbi->sb_mode = 0777 & ~umask;
	sbi->sb_n_free = -1;
	sbi->sb_n_free_dnodes = -1;
	sbi->sb_lowercase = lowercase;
	sbi->sb_eas = eas;
	sbi->sb_chk = chk;
	sbi->sb_chkdsk = chkdsk;
	sbi->sb_err = errs;
	sbi->sb_timeshift = timeshift;
	sbi->sb_was_error = 0;
	sbi->sb_cp_table = NULL;
	sbi->sb_c_bitmap = -1;
	sbi->sb_max_fwd_alloc = 0xffffff;

	if (sbi->sb_fs_size >= 0x80000000) {
		hpfs_error(s, "invalid size in superblock: %08x",
			(unsigned)sbi->sb_fs_size);
		goto bail4;
	}

	/* Load bitmap directory */
	if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
		goto bail4;
	
	/* Check for general fs errors*/
	if (spareblock->dirty && !spareblock->old_wrote) {
		if (errs == 2) {
			printk("HPFS: Improperly stopped, not mounted\n");
			goto bail4;
		}
		hpfs_error(s, "improperly stopped");
	}

	if (!(s->s_flags & MS_RDONLY)) {
		spareblock->dirty = 1;
		spareblock->old_wrote = 0;
		mark_buffer_dirty(bh2);
	}

	if (spareblock->hotfixes_used || spareblock->n_spares_used) {
		if (errs >= 2) {
			printk("HPFS: Hotfixes not supported here, try chkdsk\n");
			mark_dirty(s, 0);
			goto bail4;
		}
		hpfs_error(s, "hotfixes not supported here, try chkdsk");
		if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
		else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
	}
	if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
		if (errs >= 2) {
			printk("HPFS: Spare dnodes used, try chkdsk\n");
			mark_dirty(s, 0);
			goto bail4;
		}
		hpfs_error(s, "warning: spare dnodes used, try chkdsk");
		if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
	}
	if (chk) {
		unsigned a;
		if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
		    le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
			hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
				le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
			goto bail4;
		}
		a = sbi->sb_dirband_size;
		sbi->sb_dirband_size = 0;
		if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
		    hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
		    hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
			mark_dirty(s, 0);
			goto bail4;
		}
		sbi->sb_dirband_size = a;
	} else printk("HPFS: You really don't want any checks? You are crazy...\n");

	/* Load code page table */
	if (le32_to_cpu(spareblock->n_code_pages))
		if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
			printk("HPFS: Warning: code page support is disabled\n");

	brelse(bh2);
	brelse(bh1);
	brelse(bh0);

	root = iget_locked(s, sbi->sb_root);
	if (!root)
		goto bail0;
	hpfs_init_inode(root);
	hpfs_read_inode(root);
	unlock_new_inode(root);
	s->s_root = d_make_root(root);
	if (!s->s_root)
		goto bail0;

	/*
	 * find the root directory's . pointer & finish filling in the inode
	 */

	root_dno = hpfs_fnode_dno(s, sbi->sb_root);
	if (root_dno)
		de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
	if (!de)
		hpfs_error(s, "unable to find root dir");
	else {
		root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
		root->i_atime.tv_nsec = 0;
		root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
		root->i_mtime.tv_nsec = 0;
		root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
		root->i_ctime.tv_nsec = 0;
		hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
		hpfs_i(root)->i_parent_dir = root->i_ino;
		if (root->i_size == -1)
			root->i_size = 2048;
		if (root->i_blocks == -1)
			root->i_blocks = 5;
		hpfs_brelse4(&qbh);
	}
	hpfs_unlock(s);
	return 0;

bail4:	brelse(bh2);
bail3:	brelse(bh1);
bail2:	brelse(bh0);
bail1:
bail0:
	hpfs_unlock(s);
	free_sbi(sbi);
	return -EINVAL;
}

static struct dentry *hpfs_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
}

static struct file_system_type hpfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "hpfs",
	.mount		= hpfs_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("hpfs");

static int __init init_hpfs_fs(void)
{
	int err = init_inodecache();
	if (err)
		goto out1;
	err = register_filesystem(&hpfs_fs_type);
	if (err)
		goto out;
	return 0;
out:
	destroy_inodecache();
out1:
	return err;
}

static void __exit exit_hpfs_fs(void)
{
	unregister_filesystem(&hpfs_fs_type);
	destroy_inodecache();
}

module_init(init_hpfs_fs)
module_exit(exit_hpfs_fs)
MODULE_LICENSE("GPL");