xref: /openbmc/linux/fs/hpfs/super.c (revision e23feb16)
1 /*
2  *  linux/fs/hpfs/super.c
3  *
4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5  *
6  *  mounting, unmounting, error handling
7  */
8 
9 #include "hpfs_fn.h"
10 #include <linux/module.h>
11 #include <linux/parser.h>
12 #include <linux/init.h>
13 #include <linux/statfs.h>
14 #include <linux/magic.h>
15 #include <linux/sched.h>
16 #include <linux/bitmap.h>
17 #include <linux/slab.h>
18 
19 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
20 
21 static void mark_dirty(struct super_block *s, int remount)
22 {
23 	if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) {
24 		struct buffer_head *bh;
25 		struct hpfs_spare_block *sb;
26 		if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
27 			sb->dirty = 1;
28 			sb->old_wrote = 0;
29 			mark_buffer_dirty(bh);
30 			sync_dirty_buffer(bh);
31 			brelse(bh);
32 		}
33 	}
34 }
35 
36 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
37    were errors) */
38 
39 static void unmark_dirty(struct super_block *s)
40 {
41 	struct buffer_head *bh;
42 	struct hpfs_spare_block *sb;
43 	if (s->s_flags & MS_RDONLY) return;
44 	sync_blockdev(s->s_bdev);
45 	if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
46 		sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
47 		sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
48 		mark_buffer_dirty(bh);
49 		sync_dirty_buffer(bh);
50 		brelse(bh);
51 	}
52 }
53 
54 /* Filesystem error... */
55 static char err_buf[1024];
56 
57 void hpfs_error(struct super_block *s, const char *fmt, ...)
58 {
59 	va_list args;
60 
61 	va_start(args, fmt);
62 	vsnprintf(err_buf, sizeof(err_buf), fmt, args);
63 	va_end(args);
64 
65 	printk("HPFS: filesystem error: %s", err_buf);
66 	if (!hpfs_sb(s)->sb_was_error) {
67 		if (hpfs_sb(s)->sb_err == 2) {
68 			printk("; crashing the system because you wanted it\n");
69 			mark_dirty(s, 0);
70 			panic("HPFS panic");
71 		} else if (hpfs_sb(s)->sb_err == 1) {
72 			if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
73 			else {
74 				printk("; remounting read-only\n");
75 				mark_dirty(s, 0);
76 				s->s_flags |= MS_RDONLY;
77 			}
78 		} else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
79 		else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
80 	} else printk("\n");
81 	hpfs_sb(s)->sb_was_error = 1;
82 }
83 
84 /*
85  * A little trick to detect cycles in many hpfs structures and don't let the
86  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
87  *
88  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
89  * nested each in other, chkdsk locked up happilly.
90  */
91 
92 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
93 		char *msg)
94 {
95 	if (*c2 && *c1 == key) {
96 		hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
97 		return 1;
98 	}
99 	(*c2)++;
100 	if (!((*c2 - 1) & *c2)) *c1 = key;
101 	return 0;
102 }
103 
104 static void hpfs_put_super(struct super_block *s)
105 {
106 	struct hpfs_sb_info *sbi = hpfs_sb(s);
107 
108 	hpfs_lock(s);
109 	unmark_dirty(s);
110 	hpfs_unlock(s);
111 
112 	kfree(sbi->sb_cp_table);
113 	kfree(sbi->sb_bmp_dir);
114 	s->s_fs_info = NULL;
115 	kfree(sbi);
116 }
117 
118 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
119 {
120 	struct quad_buffer_head qbh;
121 	unsigned long *bits;
122 	unsigned count;
123 
124 	bits = hpfs_map_4sectors(s, secno, &qbh, 0);
125 	if (!bits)
126 		return 0;
127 	count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
128 	hpfs_brelse4(&qbh);
129 	return count;
130 }
131 
132 static unsigned count_bitmaps(struct super_block *s)
133 {
134 	unsigned n, count, n_bands;
135 	n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
136 	count = 0;
137 	for (n = 0; n < COUNT_RD_AHEAD; n++) {
138 		hpfs_prefetch_bitmap(s, n);
139 	}
140 	for (n = 0; n < n_bands; n++) {
141 		hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
142 		count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
143 	}
144 	return count;
145 }
146 
147 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
148 {
149 	struct super_block *s = dentry->d_sb;
150 	struct hpfs_sb_info *sbi = hpfs_sb(s);
151 	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
152 	hpfs_lock(s);
153 
154 	/*if (sbi->sb_n_free == -1) {*/
155 		sbi->sb_n_free = count_bitmaps(s);
156 		sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
157 	/*}*/
158 	buf->f_type = s->s_magic;
159 	buf->f_bsize = 512;
160 	buf->f_blocks = sbi->sb_fs_size;
161 	buf->f_bfree = sbi->sb_n_free;
162 	buf->f_bavail = sbi->sb_n_free;
163 	buf->f_files = sbi->sb_dirband_size / 4;
164 	buf->f_ffree = sbi->sb_n_free_dnodes;
165 	buf->f_fsid.val[0] = (u32)id;
166 	buf->f_fsid.val[1] = (u32)(id >> 32);
167 	buf->f_namelen = 254;
168 
169 	hpfs_unlock(s);
170 
171 	return 0;
172 }
173 
174 static struct kmem_cache * hpfs_inode_cachep;
175 
176 static struct inode *hpfs_alloc_inode(struct super_block *sb)
177 {
178 	struct hpfs_inode_info *ei;
179 	ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
180 	if (!ei)
181 		return NULL;
182 	ei->vfs_inode.i_version = 1;
183 	return &ei->vfs_inode;
184 }
185 
186 static void hpfs_i_callback(struct rcu_head *head)
187 {
188 	struct inode *inode = container_of(head, struct inode, i_rcu);
189 	kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
190 }
191 
192 static void hpfs_destroy_inode(struct inode *inode)
193 {
194 	call_rcu(&inode->i_rcu, hpfs_i_callback);
195 }
196 
197 static void init_once(void *foo)
198 {
199 	struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
200 
201 	inode_init_once(&ei->vfs_inode);
202 }
203 
204 static int init_inodecache(void)
205 {
206 	hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
207 					     sizeof(struct hpfs_inode_info),
208 					     0, (SLAB_RECLAIM_ACCOUNT|
209 						SLAB_MEM_SPREAD),
210 					     init_once);
211 	if (hpfs_inode_cachep == NULL)
212 		return -ENOMEM;
213 	return 0;
214 }
215 
216 static void destroy_inodecache(void)
217 {
218 	/*
219 	 * Make sure all delayed rcu free inodes are flushed before we
220 	 * destroy cache.
221 	 */
222 	rcu_barrier();
223 	kmem_cache_destroy(hpfs_inode_cachep);
224 }
225 
226 /*
227  * A tiny parser for option strings, stolen from dosfs.
228  * Stolen again from read-only hpfs.
229  * And updated for table-driven option parsing.
230  */
231 
232 enum {
233 	Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
234 	Opt_check_none, Opt_check_normal, Opt_check_strict,
235 	Opt_err_cont, Opt_err_ro, Opt_err_panic,
236 	Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
237 	Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
238 	Opt_timeshift, Opt_err,
239 };
240 
241 static const match_table_t tokens = {
242 	{Opt_help, "help"},
243 	{Opt_uid, "uid=%u"},
244 	{Opt_gid, "gid=%u"},
245 	{Opt_umask, "umask=%o"},
246 	{Opt_case_lower, "case=lower"},
247 	{Opt_case_asis, "case=asis"},
248 	{Opt_check_none, "check=none"},
249 	{Opt_check_normal, "check=normal"},
250 	{Opt_check_strict, "check=strict"},
251 	{Opt_err_cont, "errors=continue"},
252 	{Opt_err_ro, "errors=remount-ro"},
253 	{Opt_err_panic, "errors=panic"},
254 	{Opt_eas_no, "eas=no"},
255 	{Opt_eas_ro, "eas=ro"},
256 	{Opt_eas_rw, "eas=rw"},
257 	{Opt_chkdsk_no, "chkdsk=no"},
258 	{Opt_chkdsk_errors, "chkdsk=errors"},
259 	{Opt_chkdsk_always, "chkdsk=always"},
260 	{Opt_timeshift, "timeshift=%d"},
261 	{Opt_err, NULL},
262 };
263 
264 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
265 		      int *lowercase, int *eas, int *chk, int *errs,
266 		      int *chkdsk, int *timeshift)
267 {
268 	char *p;
269 	int option;
270 
271 	if (!opts)
272 		return 1;
273 
274 	/*printk("Parsing opts: '%s'\n",opts);*/
275 
276 	while ((p = strsep(&opts, ",")) != NULL) {
277 		substring_t args[MAX_OPT_ARGS];
278 		int token;
279 		if (!*p)
280 			continue;
281 
282 		token = match_token(p, tokens, args);
283 		switch (token) {
284 		case Opt_help:
285 			return 2;
286 		case Opt_uid:
287 			if (match_int(args, &option))
288 				return 0;
289 			*uid = make_kuid(current_user_ns(), option);
290 			if (!uid_valid(*uid))
291 				return 0;
292 			break;
293 		case Opt_gid:
294 			if (match_int(args, &option))
295 				return 0;
296 			*gid = make_kgid(current_user_ns(), option);
297 			if (!gid_valid(*gid))
298 				return 0;
299 			break;
300 		case Opt_umask:
301 			if (match_octal(args, &option))
302 				return 0;
303 			*umask = option;
304 			break;
305 		case Opt_case_lower:
306 			*lowercase = 1;
307 			break;
308 		case Opt_case_asis:
309 			*lowercase = 0;
310 			break;
311 		case Opt_check_none:
312 			*chk = 0;
313 			break;
314 		case Opt_check_normal:
315 			*chk = 1;
316 			break;
317 		case Opt_check_strict:
318 			*chk = 2;
319 			break;
320 		case Opt_err_cont:
321 			*errs = 0;
322 			break;
323 		case Opt_err_ro:
324 			*errs = 1;
325 			break;
326 		case Opt_err_panic:
327 			*errs = 2;
328 			break;
329 		case Opt_eas_no:
330 			*eas = 0;
331 			break;
332 		case Opt_eas_ro:
333 			*eas = 1;
334 			break;
335 		case Opt_eas_rw:
336 			*eas = 2;
337 			break;
338 		case Opt_chkdsk_no:
339 			*chkdsk = 0;
340 			break;
341 		case Opt_chkdsk_errors:
342 			*chkdsk = 1;
343 			break;
344 		case Opt_chkdsk_always:
345 			*chkdsk = 2;
346 			break;
347 		case Opt_timeshift:
348 		{
349 			int m = 1;
350 			char *rhs = args[0].from;
351 			if (!rhs || !*rhs)
352 				return 0;
353 			if (*rhs == '-') m = -1;
354 			if (*rhs == '+' || *rhs == '-') rhs++;
355 			*timeshift = simple_strtoul(rhs, &rhs, 0) * m;
356 			if (*rhs)
357 				return 0;
358 			break;
359 		}
360 		default:
361 			return 0;
362 		}
363 	}
364 	return 1;
365 }
366 
367 static inline void hpfs_help(void)
368 {
369 	printk("\n\
370 HPFS filesystem options:\n\
371       help              do not mount and display this text\n\
372       uid=xxx           set uid of files that don't have uid specified in eas\n\
373       gid=xxx           set gid of files that don't have gid specified in eas\n\
374       umask=xxx         set mode of files that don't have mode specified in eas\n\
375       case=lower        lowercase all files\n\
376       case=asis         do not lowercase files (default)\n\
377       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
378       check=normal      do some checks - it should not crash (default)\n\
379       check=strict      do extra time-consuming checks, used for debugging\n\
380       errors=continue   continue on errors\n\
381       errors=remount-ro remount read-only if errors found (default)\n\
382       errors=panic      panic on errors\n\
383       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
384       chkdsk=errors     mark fs dirty if errors found (default)\n\
385       chkdsk=always     always mark fs dirty - used for debugging\n\
386       eas=no            ignore extended attributes\n\
387       eas=ro            read but do not write extended attributes\n\
388       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
389       timeshift=nnn	add nnn seconds to file times\n\
390 \n");
391 }
392 
393 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
394 {
395 	kuid_t uid;
396 	kgid_t gid;
397 	umode_t umask;
398 	int lowercase, eas, chk, errs, chkdsk, timeshift;
399 	int o;
400 	struct hpfs_sb_info *sbi = hpfs_sb(s);
401 	char *new_opts = kstrdup(data, GFP_KERNEL);
402 
403 	*flags |= MS_NOATIME;
404 
405 	hpfs_lock(s);
406 	uid = sbi->sb_uid; gid = sbi->sb_gid;
407 	umask = 0777 & ~sbi->sb_mode;
408 	lowercase = sbi->sb_lowercase;
409 	eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
410 	errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
411 
412 	if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
413 	    &eas, &chk, &errs, &chkdsk, &timeshift))) {
414 		printk("HPFS: bad mount options.\n");
415 		goto out_err;
416 	}
417 	if (o == 2) {
418 		hpfs_help();
419 		goto out_err;
420 	}
421 	if (timeshift != sbi->sb_timeshift) {
422 		printk("HPFS: timeshift can't be changed using remount.\n");
423 		goto out_err;
424 	}
425 
426 	unmark_dirty(s);
427 
428 	sbi->sb_uid = uid; sbi->sb_gid = gid;
429 	sbi->sb_mode = 0777 & ~umask;
430 	sbi->sb_lowercase = lowercase;
431 	sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
432 	sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
433 
434 	if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
435 
436 	replace_mount_options(s, new_opts);
437 
438 	hpfs_unlock(s);
439 	return 0;
440 
441 out_err:
442 	hpfs_unlock(s);
443 	kfree(new_opts);
444 	return -EINVAL;
445 }
446 
447 /* Super operations */
448 
449 static const struct super_operations hpfs_sops =
450 {
451 	.alloc_inode	= hpfs_alloc_inode,
452 	.destroy_inode	= hpfs_destroy_inode,
453 	.evict_inode	= hpfs_evict_inode,
454 	.put_super	= hpfs_put_super,
455 	.statfs		= hpfs_statfs,
456 	.remount_fs	= hpfs_remount_fs,
457 	.show_options	= generic_show_options,
458 };
459 
460 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
461 {
462 	struct buffer_head *bh0, *bh1, *bh2;
463 	struct hpfs_boot_block *bootblock;
464 	struct hpfs_super_block *superblock;
465 	struct hpfs_spare_block *spareblock;
466 	struct hpfs_sb_info *sbi;
467 	struct inode *root;
468 
469 	kuid_t uid;
470 	kgid_t gid;
471 	umode_t umask;
472 	int lowercase, eas, chk, errs, chkdsk, timeshift;
473 
474 	dnode_secno root_dno;
475 	struct hpfs_dirent *de = NULL;
476 	struct quad_buffer_head qbh;
477 
478 	int o;
479 
480 	save_mount_options(s, options);
481 
482 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
483 	if (!sbi) {
484 		return -ENOMEM;
485 	}
486 	s->s_fs_info = sbi;
487 
488 	sbi->sb_bmp_dir = NULL;
489 	sbi->sb_cp_table = NULL;
490 
491 	mutex_init(&sbi->hpfs_mutex);
492 	hpfs_lock(s);
493 
494 	uid = current_uid();
495 	gid = current_gid();
496 	umask = current_umask();
497 	lowercase = 0;
498 	eas = 2;
499 	chk = 1;
500 	errs = 1;
501 	chkdsk = 1;
502 	timeshift = 0;
503 
504 	if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
505 	    &eas, &chk, &errs, &chkdsk, &timeshift))) {
506 		printk("HPFS: bad mount options.\n");
507 		goto bail0;
508 	}
509 	if (o==2) {
510 		hpfs_help();
511 		goto bail0;
512 	}
513 
514 	/*sbi->sb_mounting = 1;*/
515 	sb_set_blocksize(s, 512);
516 	sbi->sb_fs_size = -1;
517 	if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
518 	if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
519 	if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
520 
521 	/* Check magics */
522 	if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
523 	    ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
524 	    || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
525 		if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
526 		goto bail4;
527 	}
528 
529 	/* Check version */
530 	if (!(s->s_flags & MS_RDONLY) &&
531 	      superblock->funcversion != 2 && superblock->funcversion != 3) {
532 		printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
533 			(int)superblock->version, (int)superblock->funcversion);
534 		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");
535 		goto bail4;
536 	}
537 
538 	s->s_flags |= MS_NOATIME;
539 
540 	/* Fill superblock stuff */
541 	s->s_magic = HPFS_SUPER_MAGIC;
542 	s->s_op = &hpfs_sops;
543 	s->s_d_op = &hpfs_dentry_operations;
544 
545 	sbi->sb_root = le32_to_cpu(superblock->root);
546 	sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
547 	sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
548 	sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
549 	sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
550 	sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
551 	sbi->sb_uid = uid;
552 	sbi->sb_gid = gid;
553 	sbi->sb_mode = 0777 & ~umask;
554 	sbi->sb_n_free = -1;
555 	sbi->sb_n_free_dnodes = -1;
556 	sbi->sb_lowercase = lowercase;
557 	sbi->sb_eas = eas;
558 	sbi->sb_chk = chk;
559 	sbi->sb_chkdsk = chkdsk;
560 	sbi->sb_err = errs;
561 	sbi->sb_timeshift = timeshift;
562 	sbi->sb_was_error = 0;
563 	sbi->sb_cp_table = NULL;
564 	sbi->sb_c_bitmap = -1;
565 	sbi->sb_max_fwd_alloc = 0xffffff;
566 
567 	if (sbi->sb_fs_size >= 0x80000000) {
568 		hpfs_error(s, "invalid size in superblock: %08x",
569 			(unsigned)sbi->sb_fs_size);
570 		goto bail4;
571 	}
572 
573 	/* Load bitmap directory */
574 	if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
575 		goto bail4;
576 
577 	/* Check for general fs errors*/
578 	if (spareblock->dirty && !spareblock->old_wrote) {
579 		if (errs == 2) {
580 			printk("HPFS: Improperly stopped, not mounted\n");
581 			goto bail4;
582 		}
583 		hpfs_error(s, "improperly stopped");
584 	}
585 
586 	if (!(s->s_flags & MS_RDONLY)) {
587 		spareblock->dirty = 1;
588 		spareblock->old_wrote = 0;
589 		mark_buffer_dirty(bh2);
590 	}
591 
592 	if (spareblock->hotfixes_used || spareblock->n_spares_used) {
593 		if (errs >= 2) {
594 			printk("HPFS: Hotfixes not supported here, try chkdsk\n");
595 			mark_dirty(s, 0);
596 			goto bail4;
597 		}
598 		hpfs_error(s, "hotfixes not supported here, try chkdsk");
599 		if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
600 		else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
601 	}
602 	if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
603 		if (errs >= 2) {
604 			printk("HPFS: Spare dnodes used, try chkdsk\n");
605 			mark_dirty(s, 0);
606 			goto bail4;
607 		}
608 		hpfs_error(s, "warning: spare dnodes used, try chkdsk");
609 		if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
610 	}
611 	if (chk) {
612 		unsigned a;
613 		if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
614 		    le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
615 			hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
616 				le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
617 			goto bail4;
618 		}
619 		a = sbi->sb_dirband_size;
620 		sbi->sb_dirband_size = 0;
621 		if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
622 		    hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
623 		    hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
624 			mark_dirty(s, 0);
625 			goto bail4;
626 		}
627 		sbi->sb_dirband_size = a;
628 	} else printk("HPFS: You really don't want any checks? You are crazy...\n");
629 
630 	/* Load code page table */
631 	if (le32_to_cpu(spareblock->n_code_pages))
632 		if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
633 			printk("HPFS: Warning: code page support is disabled\n");
634 
635 	brelse(bh2);
636 	brelse(bh1);
637 	brelse(bh0);
638 
639 	root = iget_locked(s, sbi->sb_root);
640 	if (!root)
641 		goto bail0;
642 	hpfs_init_inode(root);
643 	hpfs_read_inode(root);
644 	unlock_new_inode(root);
645 	s->s_root = d_make_root(root);
646 	if (!s->s_root)
647 		goto bail0;
648 
649 	/*
650 	 * find the root directory's . pointer & finish filling in the inode
651 	 */
652 
653 	root_dno = hpfs_fnode_dno(s, sbi->sb_root);
654 	if (root_dno)
655 		de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
656 	if (!de)
657 		hpfs_error(s, "unable to find root dir");
658 	else {
659 		root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
660 		root->i_atime.tv_nsec = 0;
661 		root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
662 		root->i_mtime.tv_nsec = 0;
663 		root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
664 		root->i_ctime.tv_nsec = 0;
665 		hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
666 		hpfs_i(root)->i_parent_dir = root->i_ino;
667 		if (root->i_size == -1)
668 			root->i_size = 2048;
669 		if (root->i_blocks == -1)
670 			root->i_blocks = 5;
671 		hpfs_brelse4(&qbh);
672 	}
673 	hpfs_unlock(s);
674 	return 0;
675 
676 bail4:	brelse(bh2);
677 bail3:	brelse(bh1);
678 bail2:	brelse(bh0);
679 bail1:
680 bail0:
681 	hpfs_unlock(s);
682 	kfree(sbi->sb_bmp_dir);
683 	kfree(sbi->sb_cp_table);
684 	s->s_fs_info = NULL;
685 	kfree(sbi);
686 	return -EINVAL;
687 }
688 
689 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
690 	int flags, const char *dev_name, void *data)
691 {
692 	return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
693 }
694 
695 static struct file_system_type hpfs_fs_type = {
696 	.owner		= THIS_MODULE,
697 	.name		= "hpfs",
698 	.mount		= hpfs_mount,
699 	.kill_sb	= kill_block_super,
700 	.fs_flags	= FS_REQUIRES_DEV,
701 };
702 MODULE_ALIAS_FS("hpfs");
703 
704 static int __init init_hpfs_fs(void)
705 {
706 	int err = init_inodecache();
707 	if (err)
708 		goto out1;
709 	err = register_filesystem(&hpfs_fs_type);
710 	if (err)
711 		goto out;
712 	return 0;
713 out:
714 	destroy_inodecache();
715 out1:
716 	return err;
717 }
718 
719 static void __exit exit_hpfs_fs(void)
720 {
721 	unregister_filesystem(&hpfs_fs_type);
722 	destroy_inodecache();
723 }
724 
725 module_init(init_hpfs_fs)
726 module_exit(exit_hpfs_fs)
727 MODULE_LICENSE("GPL");
728