Merge commit 'v2.6.30-rc6' into perfcounters/core
[linux-2.6] / fs / hpfs / super.c
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
17 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
18
19 static void mark_dirty(struct super_block *s)
20 {
21         if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
22                 struct buffer_head *bh;
23                 struct hpfs_spare_block *sb;
24                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
25                         sb->dirty = 1;
26                         sb->old_wrote = 0;
27                         mark_buffer_dirty(bh);
28                         brelse(bh);
29                 }
30         }
31 }
32
33 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
34    were errors) */
35
36 static void unmark_dirty(struct super_block *s)
37 {
38         struct buffer_head *bh;
39         struct hpfs_spare_block *sb;
40         if (s->s_flags & MS_RDONLY) return;
41         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
42                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
43                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
44                 mark_buffer_dirty(bh);
45                 brelse(bh);
46         }
47 }
48
49 /* Filesystem error... */
50 static char err_buf[1024];
51
52 void hpfs_error(struct super_block *s, const char *fmt, ...)
53 {
54         va_list args;
55
56         va_start(args, fmt);
57         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
58         va_end(args);
59
60         printk("HPFS: filesystem error: %s", err_buf);
61         if (!hpfs_sb(s)->sb_was_error) {
62                 if (hpfs_sb(s)->sb_err == 2) {
63                         printk("; crashing the system because you wanted it\n");
64                         mark_dirty(s);
65                         panic("HPFS panic");
66                 } else if (hpfs_sb(s)->sb_err == 1) {
67                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
68                         else {
69                                 printk("; remounting read-only\n");
70                                 mark_dirty(s);
71                                 s->s_flags |= MS_RDONLY;
72                         }
73                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
74                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
75         } else printk("\n");
76         hpfs_sb(s)->sb_was_error = 1;
77 }
78
79 /* 
80  * A little trick to detect cycles in many hpfs structures and don't let the
81  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
82  *
83  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
84  * nested each in other, chkdsk locked up happilly.
85  */
86
87 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
88                 char *msg)
89 {
90         if (*c2 && *c1 == key) {
91                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
92                 return 1;
93         }
94         (*c2)++;
95         if (!((*c2 - 1) & *c2)) *c1 = key;
96         return 0;
97 }
98
99 static void hpfs_put_super(struct super_block *s)
100 {
101         struct hpfs_sb_info *sbi = hpfs_sb(s);
102         kfree(sbi->sb_cp_table);
103         kfree(sbi->sb_bmp_dir);
104         unmark_dirty(s);
105         s->s_fs_info = NULL;
106         kfree(sbi);
107 }
108
109 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
110 {
111         struct quad_buffer_head qbh;
112         unsigned *bits;
113         unsigned i, count;
114         if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
115         count = 0;
116         for (i = 0; i < 2048 / sizeof(unsigned); i++) {
117                 unsigned b; 
118                 if (!bits[i]) continue;
119                 for (b = bits[i]; b; b>>=1) count += b & 1;
120         }
121         hpfs_brelse4(&qbh);
122         return count;
123 }
124
125 static unsigned count_bitmaps(struct super_block *s)
126 {
127         unsigned n, count, n_bands;
128         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
129         count = 0;
130         for (n = 0; n < n_bands; n++)
131                 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
132         return count;
133 }
134
135 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
136 {
137         struct super_block *s = dentry->d_sb;
138         struct hpfs_sb_info *sbi = hpfs_sb(s);
139         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
140         lock_kernel();
141
142         /*if (sbi->sb_n_free == -1) {*/
143                 sbi->sb_n_free = count_bitmaps(s);
144                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
145         /*}*/
146         buf->f_type = s->s_magic;
147         buf->f_bsize = 512;
148         buf->f_blocks = sbi->sb_fs_size;
149         buf->f_bfree = sbi->sb_n_free;
150         buf->f_bavail = sbi->sb_n_free;
151         buf->f_files = sbi->sb_dirband_size / 4;
152         buf->f_ffree = sbi->sb_n_free_dnodes;
153         buf->f_fsid.val[0] = (u32)id;
154         buf->f_fsid.val[1] = (u32)(id >> 32);
155         buf->f_namelen = 254;
156
157         unlock_kernel();
158
159         return 0;
160 }
161
162 static struct kmem_cache * hpfs_inode_cachep;
163
164 static struct inode *hpfs_alloc_inode(struct super_block *sb)
165 {
166         struct hpfs_inode_info *ei;
167         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
168         if (!ei)
169                 return NULL;
170         ei->vfs_inode.i_version = 1;
171         return &ei->vfs_inode;
172 }
173
174 static void hpfs_destroy_inode(struct inode *inode)
175 {
176         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
177 }
178
179 static void init_once(void *foo)
180 {
181         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
182
183         mutex_init(&ei->i_mutex);
184         mutex_init(&ei->i_parent_mutex);
185         inode_init_once(&ei->vfs_inode);
186 }
187
188 static int init_inodecache(void)
189 {
190         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
191                                              sizeof(struct hpfs_inode_info),
192                                              0, (SLAB_RECLAIM_ACCOUNT|
193                                                 SLAB_MEM_SPREAD),
194                                              init_once);
195         if (hpfs_inode_cachep == NULL)
196                 return -ENOMEM;
197         return 0;
198 }
199
200 static void destroy_inodecache(void)
201 {
202         kmem_cache_destroy(hpfs_inode_cachep);
203 }
204
205 /*
206  * A tiny parser for option strings, stolen from dosfs.
207  * Stolen again from read-only hpfs.
208  * And updated for table-driven option parsing.
209  */
210
211 enum {
212         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
213         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
214         Opt_check_none, Opt_check_normal, Opt_check_strict,
215         Opt_err_cont, Opt_err_ro, Opt_err_panic,
216         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
217         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
218         Opt_timeshift, Opt_err,
219 };
220
221 static const match_table_t tokens = {
222         {Opt_help, "help"},
223         {Opt_uid, "uid=%u"},
224         {Opt_gid, "gid=%u"},
225         {Opt_umask, "umask=%o"},
226         {Opt_case_lower, "case=lower"},
227         {Opt_case_asis, "case=asis"},
228         {Opt_conv_binary, "conv=binary"},
229         {Opt_conv_text, "conv=text"},
230         {Opt_conv_auto, "conv=auto"},
231         {Opt_check_none, "check=none"},
232         {Opt_check_normal, "check=normal"},
233         {Opt_check_strict, "check=strict"},
234         {Opt_err_cont, "errors=continue"},
235         {Opt_err_ro, "errors=remount-ro"},
236         {Opt_err_panic, "errors=panic"},
237         {Opt_eas_no, "eas=no"},
238         {Opt_eas_ro, "eas=ro"},
239         {Opt_eas_rw, "eas=rw"},
240         {Opt_chkdsk_no, "chkdsk=no"},
241         {Opt_chkdsk_errors, "chkdsk=errors"},
242         {Opt_chkdsk_always, "chkdsk=always"},
243         {Opt_timeshift, "timeshift=%d"},
244         {Opt_err, NULL},
245 };
246
247 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
248                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
249                       int *chkdsk, int *timeshift)
250 {
251         char *p;
252         int option;
253
254         if (!opts)
255                 return 1;
256
257         /*printk("Parsing opts: '%s'\n",opts);*/
258
259         while ((p = strsep(&opts, ",")) != NULL) {
260                 substring_t args[MAX_OPT_ARGS];
261                 int token;
262                 if (!*p)
263                         continue;
264
265                 token = match_token(p, tokens, args);
266                 switch (token) {
267                 case Opt_help:
268                         return 2;
269                 case Opt_uid:
270                         if (match_int(args, &option))
271                                 return 0;
272                         *uid = option;
273                         break;
274                 case Opt_gid:
275                         if (match_int(args, &option))
276                                 return 0;
277                         *gid = option;
278                         break;
279                 case Opt_umask:
280                         if (match_octal(args, &option))
281                                 return 0;
282                         *umask = option;
283                         break;
284                 case Opt_case_lower:
285                         *lowercase = 1;
286                         break;
287                 case Opt_case_asis:
288                         *lowercase = 0;
289                         break;
290                 case Opt_conv_binary:
291                         *conv = CONV_BINARY;
292                         break;
293                 case Opt_conv_text:
294                         *conv = CONV_TEXT;
295                         break;
296                 case Opt_conv_auto:
297                         *conv = CONV_AUTO;
298                         break;
299                 case Opt_check_none:
300                         *chk = 0;
301                         break;
302                 case Opt_check_normal:
303                         *chk = 1;
304                         break;
305                 case Opt_check_strict:
306                         *chk = 2;
307                         break;
308                 case Opt_err_cont:
309                         *errs = 0;
310                         break;
311                 case Opt_err_ro:
312                         *errs = 1;
313                         break;
314                 case Opt_err_panic:
315                         *errs = 2;
316                         break;
317                 case Opt_eas_no:
318                         *eas = 0;
319                         break;
320                 case Opt_eas_ro:
321                         *eas = 1;
322                         break;
323                 case Opt_eas_rw:
324                         *eas = 2;
325                         break;
326                 case Opt_chkdsk_no:
327                         *chkdsk = 0;
328                         break;
329                 case Opt_chkdsk_errors:
330                         *chkdsk = 1;
331                         break;
332                 case Opt_chkdsk_always:
333                         *chkdsk = 2;
334                         break;
335                 case Opt_timeshift:
336                 {
337                         int m = 1;
338                         char *rhs = args[0].from;
339                         if (!rhs || !*rhs)
340                                 return 0;
341                         if (*rhs == '-') m = -1;
342                         if (*rhs == '+' || *rhs == '-') rhs++;
343                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
344                         if (*rhs)
345                                 return 0;
346                         break;
347                 }
348                 default:
349                         return 0;
350                 }
351         }
352         return 1;
353 }
354
355 static inline void hpfs_help(void)
356 {
357         printk("\n\
358 HPFS filesystem options:\n\
359       help              do not mount and display this text\n\
360       uid=xxx           set uid of files that don't have uid specified in eas\n\
361       gid=xxx           set gid of files that don't have gid specified in eas\n\
362       umask=xxx         set mode of files that don't have mode specified in eas\n\
363       case=lower        lowercase all files\n\
364       case=asis         do not lowercase files (default)\n\
365       conv=binary       do not convert CR/LF -> LF (default)\n\
366       conv=auto         convert only files with known text extensions\n\
367       conv=text         convert all files\n\
368       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
369       check=normal      do some checks - it should not crash (default)\n\
370       check=strict      do extra time-consuming checks, used for debugging\n\
371       errors=continue   continue on errors\n\
372       errors=remount-ro remount read-only if errors found (default)\n\
373       errors=panic      panic on errors\n\
374       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
375       chkdsk=errors     mark fs dirty if errors found (default)\n\
376       chkdsk=always     always mark fs dirty - used for debugging\n\
377       eas=no            ignore extended attributes\n\
378       eas=ro            read but do not write extended attributes\n\
379       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
380       timeshift=nnn     add nnn seconds to file times\n\
381 \n");
382 }
383
384 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
385 {
386         uid_t uid;
387         gid_t gid;
388         umode_t umask;
389         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
390         int o;
391         struct hpfs_sb_info *sbi = hpfs_sb(s);
392         char *new_opts = kstrdup(data, GFP_KERNEL);
393         
394         *flags |= MS_NOATIME;
395         
396         uid = sbi->sb_uid; gid = sbi->sb_gid;
397         umask = 0777 & ~sbi->sb_mode;
398         lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
399         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
400         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
401
402         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
403             &eas, &chk, &errs, &chkdsk, &timeshift))) {
404                 printk("HPFS: bad mount options.\n");
405                 goto out_err;
406         }
407         if (o == 2) {
408                 hpfs_help();
409                 goto out_err;
410         }
411         if (timeshift != sbi->sb_timeshift) {
412                 printk("HPFS: timeshift can't be changed using remount.\n");
413                 goto out_err;
414         }
415
416         unmark_dirty(s);
417
418         sbi->sb_uid = uid; sbi->sb_gid = gid;
419         sbi->sb_mode = 0777 & ~umask;
420         sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
421         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
422         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
423
424         if (!(*flags & MS_RDONLY)) mark_dirty(s);
425
426         replace_mount_options(s, new_opts);
427
428         return 0;
429
430 out_err:
431         kfree(new_opts);
432         return -EINVAL;
433 }
434
435 /* Super operations */
436
437 static const struct super_operations hpfs_sops =
438 {
439         .alloc_inode    = hpfs_alloc_inode,
440         .destroy_inode  = hpfs_destroy_inode,
441         .delete_inode   = hpfs_delete_inode,
442         .put_super      = hpfs_put_super,
443         .statfs         = hpfs_statfs,
444         .remount_fs     = hpfs_remount_fs,
445         .show_options   = generic_show_options,
446 };
447
448 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
449 {
450         struct buffer_head *bh0, *bh1, *bh2;
451         struct hpfs_boot_block *bootblock;
452         struct hpfs_super_block *superblock;
453         struct hpfs_spare_block *spareblock;
454         struct hpfs_sb_info *sbi;
455         struct inode *root;
456
457         uid_t uid;
458         gid_t gid;
459         umode_t umask;
460         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
461
462         dnode_secno root_dno;
463         struct hpfs_dirent *de = NULL;
464         struct quad_buffer_head qbh;
465
466         int o;
467
468         save_mount_options(s, options);
469
470         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
471         if (!sbi)
472                 return -ENOMEM;
473         s->s_fs_info = sbi;
474
475         sbi->sb_bmp_dir = NULL;
476         sbi->sb_cp_table = NULL;
477
478         init_MUTEX(&sbi->hpfs_creation_de);
479
480         uid = current_uid();
481         gid = current_gid();
482         umask = current_umask();
483         lowercase = 0;
484         conv = CONV_BINARY;
485         eas = 2;
486         chk = 1;
487         errs = 1;
488         chkdsk = 1;
489         timeshift = 0;
490
491         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
492             &eas, &chk, &errs, &chkdsk, &timeshift))) {
493                 printk("HPFS: bad mount options.\n");
494                 goto bail0;
495         }
496         if (o==2) {
497                 hpfs_help();
498                 goto bail0;
499         }
500
501         /*sbi->sb_mounting = 1;*/
502         sb_set_blocksize(s, 512);
503         sbi->sb_fs_size = -1;
504         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
505         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
506         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
507
508         /* Check magics */
509         if (/*bootblock->magic != BB_MAGIC
510             ||*/ superblock->magic != SB_MAGIC
511             || spareblock->magic != SP_MAGIC) {
512                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
513                 goto bail4;
514         }
515
516         /* Check version */
517         if (!(s->s_flags & MS_RDONLY) &&
518               superblock->funcversion != 2 && superblock->funcversion != 3) {
519                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
520                         (int)superblock->version, (int)superblock->funcversion);
521                 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");
522                 goto bail4;
523         }
524
525         s->s_flags |= MS_NOATIME;
526
527         /* Fill superblock stuff */
528         s->s_magic = HPFS_SUPER_MAGIC;
529         s->s_op = &hpfs_sops;
530
531         sbi->sb_root = superblock->root;
532         sbi->sb_fs_size = superblock->n_sectors;
533         sbi->sb_bitmaps = superblock->bitmaps;
534         sbi->sb_dirband_start = superblock->dir_band_start;
535         sbi->sb_dirband_size = superblock->n_dir_band;
536         sbi->sb_dmap = superblock->dir_band_bitmap;
537         sbi->sb_uid = uid;
538         sbi->sb_gid = gid;
539         sbi->sb_mode = 0777 & ~umask;
540         sbi->sb_n_free = -1;
541         sbi->sb_n_free_dnodes = -1;
542         sbi->sb_lowercase = lowercase;
543         sbi->sb_conv = conv;
544         sbi->sb_eas = eas;
545         sbi->sb_chk = chk;
546         sbi->sb_chkdsk = chkdsk;
547         sbi->sb_err = errs;
548         sbi->sb_timeshift = timeshift;
549         sbi->sb_was_error = 0;
550         sbi->sb_cp_table = NULL;
551         sbi->sb_c_bitmap = -1;
552         sbi->sb_max_fwd_alloc = 0xffffff;
553         
554         /* Load bitmap directory */
555         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
556                 goto bail4;
557         
558         /* Check for general fs errors*/
559         if (spareblock->dirty && !spareblock->old_wrote) {
560                 if (errs == 2) {
561                         printk("HPFS: Improperly stopped, not mounted\n");
562                         goto bail4;
563                 }
564                 hpfs_error(s, "improperly stopped");
565         }
566
567         if (!(s->s_flags & MS_RDONLY)) {
568                 spareblock->dirty = 1;
569                 spareblock->old_wrote = 0;
570                 mark_buffer_dirty(bh2);
571         }
572
573         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
574                 if (errs >= 2) {
575                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
576                         mark_dirty(s);
577                         goto bail4;
578                 }
579                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
580                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
581                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
582         }
583         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
584                 if (errs >= 2) {
585                         printk("HPFS: Spare dnodes used, try chkdsk\n");
586                         mark_dirty(s);
587                         goto bail4;
588                 }
589                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
590                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
591         }
592         if (chk) {
593                 unsigned a;
594                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
595                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
596                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
597                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
598                         goto bail4;
599                 }
600                 a = sbi->sb_dirband_size;
601                 sbi->sb_dirband_size = 0;
602                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
603                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
604                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
605                         mark_dirty(s);
606                         goto bail4;
607                 }
608                 sbi->sb_dirband_size = a;
609         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
610
611         /* Load code page table */
612         if (spareblock->n_code_pages)
613                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
614                         printk("HPFS: Warning: code page support is disabled\n");
615
616         brelse(bh2);
617         brelse(bh1);
618         brelse(bh0);
619
620         root = iget_locked(s, sbi->sb_root);
621         if (!root)
622                 goto bail0;
623         hpfs_init_inode(root);
624         hpfs_read_inode(root);
625         unlock_new_inode(root);
626         s->s_root = d_alloc_root(root);
627         if (!s->s_root) {
628                 iput(root);
629                 goto bail0;
630         }
631         hpfs_set_dentry_operations(s->s_root);
632
633         /*
634          * find the root directory's . pointer & finish filling in the inode
635          */
636
637         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
638         if (root_dno)
639                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
640         if (!de)
641                 hpfs_error(s, "unable to find root dir");
642         else {
643                 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
644                 root->i_atime.tv_nsec = 0;
645                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
646                 root->i_mtime.tv_nsec = 0;
647                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
648                 root->i_ctime.tv_nsec = 0;
649                 hpfs_i(root)->i_ea_size = de->ea_size;
650                 hpfs_i(root)->i_parent_dir = root->i_ino;
651                 if (root->i_size == -1)
652                         root->i_size = 2048;
653                 if (root->i_blocks == -1)
654                         root->i_blocks = 5;
655                 hpfs_brelse4(&qbh);
656         }
657         return 0;
658
659 bail4:  brelse(bh2);
660 bail3:  brelse(bh1);
661 bail2:  brelse(bh0);
662 bail1:
663 bail0:
664         kfree(sbi->sb_bmp_dir);
665         kfree(sbi->sb_cp_table);
666         s->s_fs_info = NULL;
667         kfree(sbi);
668         return -EINVAL;
669 }
670
671 static int hpfs_get_sb(struct file_system_type *fs_type,
672         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
673 {
674         return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
675                            mnt);
676 }
677
678 static struct file_system_type hpfs_fs_type = {
679         .owner          = THIS_MODULE,
680         .name           = "hpfs",
681         .get_sb         = hpfs_get_sb,
682         .kill_sb        = kill_block_super,
683         .fs_flags       = FS_REQUIRES_DEV,
684 };
685
686 static int __init init_hpfs_fs(void)
687 {
688         int err = init_inodecache();
689         if (err)
690                 goto out1;
691         err = register_filesystem(&hpfs_fs_type);
692         if (err)
693                 goto out;
694         return 0;
695 out:
696         destroy_inodecache();
697 out1:
698         return err;
699 }
700
701 static void __exit exit_hpfs_fs(void)
702 {
703         unregister_filesystem(&hpfs_fs_type);
704         destroy_inodecache();
705 }
706
707 module_init(init_hpfs_fs)
708 module_exit(exit_hpfs_fs)
709 MODULE_LICENSE("GPL");