xref: /openbmc/linux/fs/hpfs/super.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 
16 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
17 
18 static void mark_dirty(struct super_block *s)
19 {
20 	if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
21 		struct buffer_head *bh;
22 		struct hpfs_spare_block *sb;
23 		if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
24 			sb->dirty = 1;
25 			sb->old_wrote = 0;
26 			mark_buffer_dirty(bh);
27 			brelse(bh);
28 		}
29 	}
30 }
31 
32 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
33    were errors) */
34 
35 static void unmark_dirty(struct super_block *s)
36 {
37 	struct buffer_head *bh;
38 	struct hpfs_spare_block *sb;
39 	if (s->s_flags & MS_RDONLY) return;
40 	if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
41 		sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
42 		sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
43 		mark_buffer_dirty(bh);
44 		brelse(bh);
45 	}
46 }
47 
48 /* Filesystem error... */
49 static char err_buf[1024];
50 
51 void hpfs_error(struct super_block *s, const char *fmt, ...)
52 {
53 	va_list args;
54 
55 	va_start(args, fmt);
56 	vsnprintf(err_buf, sizeof(err_buf), fmt, args);
57 	va_end(args);
58 
59 	printk("HPFS: filesystem error: %s", err_buf);
60 	if (!hpfs_sb(s)->sb_was_error) {
61 		if (hpfs_sb(s)->sb_err == 2) {
62 			printk("; crashing the system because you wanted it\n");
63 			mark_dirty(s);
64 			panic("HPFS panic");
65 		} else if (hpfs_sb(s)->sb_err == 1) {
66 			if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
67 			else {
68 				printk("; remounting read-only\n");
69 				mark_dirty(s);
70 				s->s_flags |= MS_RDONLY;
71 			}
72 		} else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
73 		else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
74 	} else printk("\n");
75 	hpfs_sb(s)->sb_was_error = 1;
76 }
77 
78 /*
79  * A little trick to detect cycles in many hpfs structures and don't let the
80  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
81  *
82  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
83  * nested each in other, chkdsk locked up happilly.
84  */
85 
86 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
87 		char *msg)
88 {
89 	if (*c2 && *c1 == key) {
90 		hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
91 		return 1;
92 	}
93 	(*c2)++;
94 	if (!((*c2 - 1) & *c2)) *c1 = key;
95 	return 0;
96 }
97 
98 static void hpfs_put_super(struct super_block *s)
99 {
100 	struct hpfs_sb_info *sbi = hpfs_sb(s);
101 	kfree(sbi->sb_cp_table);
102 	kfree(sbi->sb_bmp_dir);
103 	unmark_dirty(s);
104 	s->s_fs_info = NULL;
105 	kfree(sbi);
106 }
107 
108 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
109 {
110 	struct quad_buffer_head qbh;
111 	unsigned *bits;
112 	unsigned i, count;
113 	if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
114 	count = 0;
115 	for (i = 0; i < 2048 / sizeof(unsigned); i++) {
116 		unsigned b;
117 		if (!bits[i]) continue;
118 		for (b = bits[i]; b; b>>=1) count += b & 1;
119 	}
120 	hpfs_brelse4(&qbh);
121 	return count;
122 }
123 
124 static unsigned count_bitmaps(struct super_block *s)
125 {
126 	unsigned n, count, n_bands;
127 	n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
128 	count = 0;
129 	for (n = 0; n < n_bands; n++)
130 		count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
131 	return count;
132 }
133 
134 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
135 {
136 	struct super_block *s = dentry->d_sb;
137 	struct hpfs_sb_info *sbi = hpfs_sb(s);
138 	lock_kernel();
139 
140 	/*if (sbi->sb_n_free == -1) {*/
141 		sbi->sb_n_free = count_bitmaps(s);
142 		sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
143 	/*}*/
144 	buf->f_type = s->s_magic;
145 	buf->f_bsize = 512;
146 	buf->f_blocks = sbi->sb_fs_size;
147 	buf->f_bfree = sbi->sb_n_free;
148 	buf->f_bavail = sbi->sb_n_free;
149 	buf->f_files = sbi->sb_dirband_size / 4;
150 	buf->f_ffree = sbi->sb_n_free_dnodes;
151 	buf->f_namelen = 254;
152 
153 	unlock_kernel();
154 
155 	return 0;
156 }
157 
158 static struct kmem_cache * hpfs_inode_cachep;
159 
160 static struct inode *hpfs_alloc_inode(struct super_block *sb)
161 {
162 	struct hpfs_inode_info *ei;
163 	ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
164 	if (!ei)
165 		return NULL;
166 	ei->vfs_inode.i_version = 1;
167 	return &ei->vfs_inode;
168 }
169 
170 static void hpfs_destroy_inode(struct inode *inode)
171 {
172 	kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
173 }
174 
175 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
176 {
177 	struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
178 
179 	if (flags & SLAB_CTOR_CONSTRUCTOR) {
180 		mutex_init(&ei->i_mutex);
181 		mutex_init(&ei->i_parent_mutex);
182 		inode_init_once(&ei->vfs_inode);
183 	}
184 }
185 
186 static int init_inodecache(void)
187 {
188 	hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
189 					     sizeof(struct hpfs_inode_info),
190 					     0, (SLAB_RECLAIM_ACCOUNT|
191 						SLAB_MEM_SPREAD),
192 					     init_once, NULL);
193 	if (hpfs_inode_cachep == NULL)
194 		return -ENOMEM;
195 	return 0;
196 }
197 
198 static void destroy_inodecache(void)
199 {
200 	kmem_cache_destroy(hpfs_inode_cachep);
201 }
202 
203 /*
204  * A tiny parser for option strings, stolen from dosfs.
205  * Stolen again from read-only hpfs.
206  * And updated for table-driven option parsing.
207  */
208 
209 enum {
210 	Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
211 	Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
212 	Opt_check_none, Opt_check_normal, Opt_check_strict,
213 	Opt_err_cont, Opt_err_ro, Opt_err_panic,
214 	Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
215 	Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
216 	Opt_timeshift, Opt_err,
217 };
218 
219 static match_table_t tokens = {
220 	{Opt_help, "help"},
221 	{Opt_uid, "uid=%u"},
222 	{Opt_gid, "gid=%u"},
223 	{Opt_umask, "umask=%o"},
224 	{Opt_case_lower, "case=lower"},
225 	{Opt_case_asis, "case=asis"},
226 	{Opt_conv_binary, "conv=binary"},
227 	{Opt_conv_text, "conv=text"},
228 	{Opt_conv_auto, "conv=auto"},
229 	{Opt_check_none, "check=none"},
230 	{Opt_check_normal, "check=normal"},
231 	{Opt_check_strict, "check=strict"},
232 	{Opt_err_cont, "errors=continue"},
233 	{Opt_err_ro, "errors=remount-ro"},
234 	{Opt_err_panic, "errors=panic"},
235 	{Opt_eas_no, "eas=no"},
236 	{Opt_eas_ro, "eas=ro"},
237 	{Opt_eas_rw, "eas=rw"},
238 	{Opt_chkdsk_no, "chkdsk=no"},
239 	{Opt_chkdsk_errors, "chkdsk=errors"},
240 	{Opt_chkdsk_always, "chkdsk=always"},
241 	{Opt_timeshift, "timeshift=%d"},
242 	{Opt_err, NULL},
243 };
244 
245 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
246 		      int *lowercase, int *conv, int *eas, int *chk, int *errs,
247 		      int *chkdsk, int *timeshift)
248 {
249 	char *p;
250 	int option;
251 
252 	if (!opts)
253 		return 1;
254 
255 	/*printk("Parsing opts: '%s'\n",opts);*/
256 
257 	while ((p = strsep(&opts, ",")) != NULL) {
258 		substring_t args[MAX_OPT_ARGS];
259 		int token;
260 		if (!*p)
261 			continue;
262 
263 		token = match_token(p, tokens, args);
264 		switch (token) {
265 		case Opt_help:
266 			return 2;
267 		case Opt_uid:
268 			if (match_int(args, &option))
269 				return 0;
270 			*uid = option;
271 			break;
272 		case Opt_gid:
273 			if (match_int(args, &option))
274 				return 0;
275 			*gid = option;
276 			break;
277 		case Opt_umask:
278 			if (match_octal(args, &option))
279 				return 0;
280 			*umask = option;
281 			break;
282 		case Opt_case_lower:
283 			*lowercase = 1;
284 			break;
285 		case Opt_case_asis:
286 			*lowercase = 0;
287 			break;
288 		case Opt_conv_binary:
289 			*conv = CONV_BINARY;
290 			break;
291 		case Opt_conv_text:
292 			*conv = CONV_TEXT;
293 			break;
294 		case Opt_conv_auto:
295 			*conv = CONV_AUTO;
296 			break;
297 		case Opt_check_none:
298 			*chk = 0;
299 			break;
300 		case Opt_check_normal:
301 			*chk = 1;
302 			break;
303 		case Opt_check_strict:
304 			*chk = 2;
305 			break;
306 		case Opt_err_cont:
307 			*errs = 0;
308 			break;
309 		case Opt_err_ro:
310 			*errs = 1;
311 			break;
312 		case Opt_err_panic:
313 			*errs = 2;
314 			break;
315 		case Opt_eas_no:
316 			*eas = 0;
317 			break;
318 		case Opt_eas_ro:
319 			*eas = 1;
320 			break;
321 		case Opt_eas_rw:
322 			*eas = 2;
323 			break;
324 		case Opt_chkdsk_no:
325 			*chkdsk = 0;
326 			break;
327 		case Opt_chkdsk_errors:
328 			*chkdsk = 1;
329 			break;
330 		case Opt_chkdsk_always:
331 			*chkdsk = 2;
332 			break;
333 		case Opt_timeshift:
334 		{
335 			int m = 1;
336 			char *rhs = args[0].from;
337 			if (!rhs || !*rhs)
338 				return 0;
339 			if (*rhs == '-') m = -1;
340 			if (*rhs == '+' || *rhs == '-') rhs++;
341 			*timeshift = simple_strtoul(rhs, &rhs, 0) * m;
342 			if (*rhs)
343 				return 0;
344 			break;
345 		}
346 		default:
347 			return 0;
348 		}
349 	}
350 	return 1;
351 }
352 
353 static inline void hpfs_help(void)
354 {
355 	printk("\n\
356 HPFS filesystem options:\n\
357       help              do not mount and display this text\n\
358       uid=xxx           set uid of files that don't have uid specified in eas\n\
359       gid=xxx           set gid of files that don't have gid specified in eas\n\
360       umask=xxx         set mode of files that don't have mode specified in eas\n\
361       case=lower        lowercase all files\n\
362       case=asis         do not lowercase files (default)\n\
363       conv=binary       do not convert CR/LF -> LF (default)\n\
364       conv=auto         convert only files with known text extensions\n\
365       conv=text         convert all files\n\
366       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
367       check=normal      do some checks - it should not crash (default)\n\
368       check=strict      do extra time-consuming checks, used for debugging\n\
369       errors=continue   continue on errors\n\
370       errors=remount-ro remount read-only if errors found (default)\n\
371       errors=panic      panic on errors\n\
372       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
373       chkdsk=errors     mark fs dirty if errors found (default)\n\
374       chkdsk=always     always mark fs dirty - used for debugging\n\
375       eas=no            ignore extended attributes\n\
376       eas=ro            read but do not write extended attributes\n\
377       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
378       timeshift=nnn	add nnn seconds to file times\n\
379 \n");
380 }
381 
382 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
383 {
384 	uid_t uid;
385 	gid_t gid;
386 	umode_t umask;
387 	int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
388 	int o;
389 	struct hpfs_sb_info *sbi = hpfs_sb(s);
390 
391 	*flags |= MS_NOATIME;
392 
393 	uid = sbi->sb_uid; gid = sbi->sb_gid;
394 	umask = 0777 & ~sbi->sb_mode;
395 	lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
396 	eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
397 	errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
398 
399 	if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
400 	    &eas, &chk, &errs, &chkdsk, &timeshift))) {
401 		printk("HPFS: bad mount options.\n");
402 	    	return 1;
403 	}
404 	if (o == 2) {
405 		hpfs_help();
406 		return 1;
407 	}
408 	if (timeshift != sbi->sb_timeshift) {
409 		printk("HPFS: timeshift can't be changed using remount.\n");
410 		return 1;
411 	}
412 
413 	unmark_dirty(s);
414 
415 	sbi->sb_uid = uid; sbi->sb_gid = gid;
416 	sbi->sb_mode = 0777 & ~umask;
417 	sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
418 	sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
419 	sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
420 
421 	if (!(*flags & MS_RDONLY)) mark_dirty(s);
422 
423 	return 0;
424 }
425 
426 /* Super operations */
427 
428 static const struct super_operations hpfs_sops =
429 {
430 	.alloc_inode	= hpfs_alloc_inode,
431 	.destroy_inode	= hpfs_destroy_inode,
432 	.delete_inode	= hpfs_delete_inode,
433 	.put_super	= hpfs_put_super,
434 	.statfs		= hpfs_statfs,
435 	.remount_fs	= hpfs_remount_fs,
436 };
437 
438 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
439 {
440 	struct buffer_head *bh0, *bh1, *bh2;
441 	struct hpfs_boot_block *bootblock;
442 	struct hpfs_super_block *superblock;
443 	struct hpfs_spare_block *spareblock;
444 	struct hpfs_sb_info *sbi;
445 	struct inode *root;
446 
447 	uid_t uid;
448 	gid_t gid;
449 	umode_t umask;
450 	int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
451 
452 	dnode_secno root_dno;
453 	struct hpfs_dirent *de = NULL;
454 	struct quad_buffer_head qbh;
455 
456 	int o;
457 
458 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
459 	if (!sbi)
460 		return -ENOMEM;
461 	s->s_fs_info = sbi;
462 
463 	sbi->sb_bmp_dir = NULL;
464 	sbi->sb_cp_table = NULL;
465 
466 	init_MUTEX(&sbi->hpfs_creation_de);
467 
468 	uid = current->uid;
469 	gid = current->gid;
470 	umask = current->fs->umask;
471 	lowercase = 0;
472 	conv = CONV_BINARY;
473 	eas = 2;
474 	chk = 1;
475 	errs = 1;
476 	chkdsk = 1;
477 	timeshift = 0;
478 
479 	if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
480 	    &eas, &chk, &errs, &chkdsk, &timeshift))) {
481 		printk("HPFS: bad mount options.\n");
482 		goto bail0;
483 	}
484 	if (o==2) {
485 		hpfs_help();
486 		goto bail0;
487 	}
488 
489 	/*sbi->sb_mounting = 1;*/
490 	sb_set_blocksize(s, 512);
491 	sbi->sb_fs_size = -1;
492 	if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
493 	if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
494 	if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
495 
496 	/* Check magics */
497 	if (/*bootblock->magic != BB_MAGIC
498 	    ||*/ superblock->magic != SB_MAGIC
499 	    || spareblock->magic != SP_MAGIC) {
500 		if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
501 		goto bail4;
502 	}
503 
504 	/* Check version */
505 	if (!(s->s_flags & MS_RDONLY) &&
506 	      superblock->funcversion != 2 && superblock->funcversion != 3) {
507 		printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
508 			(int)superblock->version, (int)superblock->funcversion);
509 		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");
510 		goto bail4;
511 	}
512 
513 	s->s_flags |= MS_NOATIME;
514 
515 	/* Fill superblock stuff */
516 	s->s_magic = HPFS_SUPER_MAGIC;
517 	s->s_op = &hpfs_sops;
518 
519 	sbi->sb_root = superblock->root;
520 	sbi->sb_fs_size = superblock->n_sectors;
521 	sbi->sb_bitmaps = superblock->bitmaps;
522 	sbi->sb_dirband_start = superblock->dir_band_start;
523 	sbi->sb_dirband_size = superblock->n_dir_band;
524 	sbi->sb_dmap = superblock->dir_band_bitmap;
525 	sbi->sb_uid = uid;
526 	sbi->sb_gid = gid;
527 	sbi->sb_mode = 0777 & ~umask;
528 	sbi->sb_n_free = -1;
529 	sbi->sb_n_free_dnodes = -1;
530 	sbi->sb_lowercase = lowercase;
531 	sbi->sb_conv = conv;
532 	sbi->sb_eas = eas;
533 	sbi->sb_chk = chk;
534 	sbi->sb_chkdsk = chkdsk;
535 	sbi->sb_err = errs;
536 	sbi->sb_timeshift = timeshift;
537 	sbi->sb_was_error = 0;
538 	sbi->sb_cp_table = NULL;
539 	sbi->sb_c_bitmap = -1;
540 	sbi->sb_max_fwd_alloc = 0xffffff;
541 
542 	/* Load bitmap directory */
543 	if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
544 		goto bail4;
545 
546 	/* Check for general fs errors*/
547 	if (spareblock->dirty && !spareblock->old_wrote) {
548 		if (errs == 2) {
549 			printk("HPFS: Improperly stopped, not mounted\n");
550 			goto bail4;
551 		}
552 		hpfs_error(s, "improperly stopped");
553 	}
554 
555 	if (!(s->s_flags & MS_RDONLY)) {
556 		spareblock->dirty = 1;
557 		spareblock->old_wrote = 0;
558 		mark_buffer_dirty(bh2);
559 	}
560 
561 	if (spareblock->hotfixes_used || spareblock->n_spares_used) {
562 		if (errs >= 2) {
563 			printk("HPFS: Hotfixes not supported here, try chkdsk\n");
564 			mark_dirty(s);
565 			goto bail4;
566 		}
567 		hpfs_error(s, "hotfixes not supported here, try chkdsk");
568 		if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
569 		else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
570 	}
571 	if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
572 		if (errs >= 2) {
573 			printk("HPFS: Spare dnodes used, try chkdsk\n");
574 			mark_dirty(s);
575 			goto bail4;
576 		}
577 		hpfs_error(s, "warning: spare dnodes used, try chkdsk");
578 		if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
579 	}
580 	if (chk) {
581 		unsigned a;
582 		if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
583 		    superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
584 			hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
585 				superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
586 			goto bail4;
587 		}
588 		a = sbi->sb_dirband_size;
589 		sbi->sb_dirband_size = 0;
590 		if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
591 		    hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
592 		    hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
593 			mark_dirty(s);
594 			goto bail4;
595 		}
596 		sbi->sb_dirband_size = a;
597 	} else printk("HPFS: You really don't want any checks? You are crazy...\n");
598 
599 	/* Load code page table */
600 	if (spareblock->n_code_pages)
601 		if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
602 			printk("HPFS: Warning: code page support is disabled\n");
603 
604 	brelse(bh2);
605 	brelse(bh1);
606 	brelse(bh0);
607 
608 	root = iget_locked(s, sbi->sb_root);
609 	if (!root)
610 		goto bail0;
611 	hpfs_init_inode(root);
612 	hpfs_read_inode(root);
613 	unlock_new_inode(root);
614 	s->s_root = d_alloc_root(root);
615 	if (!s->s_root) {
616 		iput(root);
617 		goto bail0;
618 	}
619 	hpfs_set_dentry_operations(s->s_root);
620 
621 	/*
622 	 * find the root directory's . pointer & finish filling in the inode
623 	 */
624 
625 	root_dno = hpfs_fnode_dno(s, sbi->sb_root);
626 	if (root_dno)
627 		de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
628 	if (!de)
629 		hpfs_error(s, "unable to find root dir");
630 	else {
631 		root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
632 		root->i_atime.tv_nsec = 0;
633 		root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
634 		root->i_mtime.tv_nsec = 0;
635 		root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
636 		root->i_ctime.tv_nsec = 0;
637 		hpfs_i(root)->i_ea_size = de->ea_size;
638 		hpfs_i(root)->i_parent_dir = root->i_ino;
639 		if (root->i_size == -1)
640 			root->i_size = 2048;
641 		if (root->i_blocks == -1)
642 			root->i_blocks = 5;
643 		hpfs_brelse4(&qbh);
644 	}
645 	return 0;
646 
647 bail4:	brelse(bh2);
648 bail3:	brelse(bh1);
649 bail2:	brelse(bh0);
650 bail1:
651 bail0:
652 	kfree(sbi->sb_bmp_dir);
653 	kfree(sbi->sb_cp_table);
654 	s->s_fs_info = NULL;
655 	kfree(sbi);
656 	return -EINVAL;
657 }
658 
659 static int hpfs_get_sb(struct file_system_type *fs_type,
660 	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
661 {
662 	return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
663 			   mnt);
664 }
665 
666 static struct file_system_type hpfs_fs_type = {
667 	.owner		= THIS_MODULE,
668 	.name		= "hpfs",
669 	.get_sb		= hpfs_get_sb,
670 	.kill_sb	= kill_block_super,
671 	.fs_flags	= FS_REQUIRES_DEV,
672 };
673 
674 static int __init init_hpfs_fs(void)
675 {
676 	int err = init_inodecache();
677 	if (err)
678 		goto out1;
679 	err = register_filesystem(&hpfs_fs_type);
680 	if (err)
681 		goto out;
682 	return 0;
683 out:
684 	destroy_inodecache();
685 out1:
686 	return err;
687 }
688 
689 static void __exit exit_hpfs_fs(void)
690 {
691 	unregister_filesystem(&hpfs_fs_type);
692 	destroy_inodecache();
693 }
694 
695 module_init(init_hpfs_fs)
696 module_exit(exit_hpfs_fs)
697 MODULE_LICENSE("GPL");
698