Merge branch 'x86/spinlocks' into x86/xen
[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         lock_kernel();
140
141         /*if (sbi->sb_n_free == -1) {*/
142                 sbi->sb_n_free = count_bitmaps(s);
143                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
144         /*}*/
145         buf->f_type = s->s_magic;
146         buf->f_bsize = 512;
147         buf->f_blocks = sbi->sb_fs_size;
148         buf->f_bfree = sbi->sb_n_free;
149         buf->f_bavail = sbi->sb_n_free;
150         buf->f_files = sbi->sb_dirband_size / 4;
151         buf->f_ffree = sbi->sb_n_free_dnodes;
152         buf->f_namelen = 254;
153
154         unlock_kernel();
155
156         return 0;
157 }
158
159 static struct kmem_cache * hpfs_inode_cachep;
160
161 static struct inode *hpfs_alloc_inode(struct super_block *sb)
162 {
163         struct hpfs_inode_info *ei;
164         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
165         if (!ei)
166                 return NULL;
167         ei->vfs_inode.i_version = 1;
168         return &ei->vfs_inode;
169 }
170
171 static void hpfs_destroy_inode(struct inode *inode)
172 {
173         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
174 }
175
176 static void init_once(void *foo)
177 {
178         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
179
180         mutex_init(&ei->i_mutex);
181         mutex_init(&ei->i_parent_mutex);
182         inode_init_once(&ei->vfs_inode);
183 }
184
185 static int init_inodecache(void)
186 {
187         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
188                                              sizeof(struct hpfs_inode_info),
189                                              0, (SLAB_RECLAIM_ACCOUNT|
190                                                 SLAB_MEM_SPREAD),
191                                              init_once);
192         if (hpfs_inode_cachep == NULL)
193                 return -ENOMEM;
194         return 0;
195 }
196
197 static void destroy_inodecache(void)
198 {
199         kmem_cache_destroy(hpfs_inode_cachep);
200 }
201
202 /*
203  * A tiny parser for option strings, stolen from dosfs.
204  * Stolen again from read-only hpfs.
205  * And updated for table-driven option parsing.
206  */
207
208 enum {
209         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
210         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
211         Opt_check_none, Opt_check_normal, Opt_check_strict,
212         Opt_err_cont, Opt_err_ro, Opt_err_panic,
213         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
214         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
215         Opt_timeshift, Opt_err,
216 };
217
218 static match_table_t tokens = {
219         {Opt_help, "help"},
220         {Opt_uid, "uid=%u"},
221         {Opt_gid, "gid=%u"},
222         {Opt_umask, "umask=%o"},
223         {Opt_case_lower, "case=lower"},
224         {Opt_case_asis, "case=asis"},
225         {Opt_conv_binary, "conv=binary"},
226         {Opt_conv_text, "conv=text"},
227         {Opt_conv_auto, "conv=auto"},
228         {Opt_check_none, "check=none"},
229         {Opt_check_normal, "check=normal"},
230         {Opt_check_strict, "check=strict"},
231         {Opt_err_cont, "errors=continue"},
232         {Opt_err_ro, "errors=remount-ro"},
233         {Opt_err_panic, "errors=panic"},
234         {Opt_eas_no, "eas=no"},
235         {Opt_eas_ro, "eas=ro"},
236         {Opt_eas_rw, "eas=rw"},
237         {Opt_chkdsk_no, "chkdsk=no"},
238         {Opt_chkdsk_errors, "chkdsk=errors"},
239         {Opt_chkdsk_always, "chkdsk=always"},
240         {Opt_timeshift, "timeshift=%d"},
241         {Opt_err, NULL},
242 };
243
244 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
245                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
246                       int *chkdsk, int *timeshift)
247 {
248         char *p;
249         int option;
250
251         if (!opts)
252                 return 1;
253
254         /*printk("Parsing opts: '%s'\n",opts);*/
255
256         while ((p = strsep(&opts, ",")) != NULL) {
257                 substring_t args[MAX_OPT_ARGS];
258                 int token;
259                 if (!*p)
260                         continue;
261
262                 token = match_token(p, tokens, args);
263                 switch (token) {
264                 case Opt_help:
265                         return 2;
266                 case Opt_uid:
267                         if (match_int(args, &option))
268                                 return 0;
269                         *uid = option;
270                         break;
271                 case Opt_gid:
272                         if (match_int(args, &option))
273                                 return 0;
274                         *gid = option;
275                         break;
276                 case Opt_umask:
277                         if (match_octal(args, &option))
278                                 return 0;
279                         *umask = option;
280                         break;
281                 case Opt_case_lower:
282                         *lowercase = 1;
283                         break;
284                 case Opt_case_asis:
285                         *lowercase = 0;
286                         break;
287                 case Opt_conv_binary:
288                         *conv = CONV_BINARY;
289                         break;
290                 case Opt_conv_text:
291                         *conv = CONV_TEXT;
292                         break;
293                 case Opt_conv_auto:
294                         *conv = CONV_AUTO;
295                         break;
296                 case Opt_check_none:
297                         *chk = 0;
298                         break;
299                 case Opt_check_normal:
300                         *chk = 1;
301                         break;
302                 case Opt_check_strict:
303                         *chk = 2;
304                         break;
305                 case Opt_err_cont:
306                         *errs = 0;
307                         break;
308                 case Opt_err_ro:
309                         *errs = 1;
310                         break;
311                 case Opt_err_panic:
312                         *errs = 2;
313                         break;
314                 case Opt_eas_no:
315                         *eas = 0;
316                         break;
317                 case Opt_eas_ro:
318                         *eas = 1;
319                         break;
320                 case Opt_eas_rw:
321                         *eas = 2;
322                         break;
323                 case Opt_chkdsk_no:
324                         *chkdsk = 0;
325                         break;
326                 case Opt_chkdsk_errors:
327                         *chkdsk = 1;
328                         break;
329                 case Opt_chkdsk_always:
330                         *chkdsk = 2;
331                         break;
332                 case Opt_timeshift:
333                 {
334                         int m = 1;
335                         char *rhs = args[0].from;
336                         if (!rhs || !*rhs)
337                                 return 0;
338                         if (*rhs == '-') m = -1;
339                         if (*rhs == '+' || *rhs == '-') rhs++;
340                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
341                         if (*rhs)
342                                 return 0;
343                         break;
344                 }
345                 default:
346                         return 0;
347                 }
348         }
349         return 1;
350 }
351
352 static inline void hpfs_help(void)
353 {
354         printk("\n\
355 HPFS filesystem options:\n\
356       help              do not mount and display this text\n\
357       uid=xxx           set uid of files that don't have uid specified in eas\n\
358       gid=xxx           set gid of files that don't have gid specified in eas\n\
359       umask=xxx         set mode of files that don't have mode specified in eas\n\
360       case=lower        lowercase all files\n\
361       case=asis         do not lowercase files (default)\n\
362       conv=binary       do not convert CR/LF -> LF (default)\n\
363       conv=auto         convert only files with known text extensions\n\
364       conv=text         convert all files\n\
365       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
366       check=normal      do some checks - it should not crash (default)\n\
367       check=strict      do extra time-consuming checks, used for debugging\n\
368       errors=continue   continue on errors\n\
369       errors=remount-ro remount read-only if errors found (default)\n\
370       errors=panic      panic on errors\n\
371       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
372       chkdsk=errors     mark fs dirty if errors found (default)\n\
373       chkdsk=always     always mark fs dirty - used for debugging\n\
374       eas=no            ignore extended attributes\n\
375       eas=ro            read but do not write extended attributes\n\
376       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
377       timeshift=nnn     add nnn seconds to file times\n\
378 \n");
379 }
380
381 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
382 {
383         uid_t uid;
384         gid_t gid;
385         umode_t umask;
386         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
387         int o;
388         struct hpfs_sb_info *sbi = hpfs_sb(s);
389         char *new_opts = kstrdup(data, GFP_KERNEL);
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                 goto out_err;
403         }
404         if (o == 2) {
405                 hpfs_help();
406                 goto out_err;
407         }
408         if (timeshift != sbi->sb_timeshift) {
409                 printk("HPFS: timeshift can't be changed using remount.\n");
410                 goto out_err;
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         kfree(s->s_options);
424         s->s_options = new_opts;
425
426         return 0;
427
428 out_err:
429         kfree(new_opts);
430         return -EINVAL;
431 }
432
433 /* Super operations */
434
435 static const struct super_operations hpfs_sops =
436 {
437         .alloc_inode    = hpfs_alloc_inode,
438         .destroy_inode  = hpfs_destroy_inode,
439         .delete_inode   = hpfs_delete_inode,
440         .put_super      = hpfs_put_super,
441         .statfs         = hpfs_statfs,
442         .remount_fs     = hpfs_remount_fs,
443         .show_options   = generic_show_options,
444 };
445
446 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
447 {
448         struct buffer_head *bh0, *bh1, *bh2;
449         struct hpfs_boot_block *bootblock;
450         struct hpfs_super_block *superblock;
451         struct hpfs_spare_block *spareblock;
452         struct hpfs_sb_info *sbi;
453         struct inode *root;
454
455         uid_t uid;
456         gid_t gid;
457         umode_t umask;
458         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
459
460         dnode_secno root_dno;
461         struct hpfs_dirent *de = NULL;
462         struct quad_buffer_head qbh;
463
464         int o;
465
466         save_mount_options(s, options);
467
468         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
469         if (!sbi)
470                 return -ENOMEM;
471         s->s_fs_info = sbi;
472
473         sbi->sb_bmp_dir = NULL;
474         sbi->sb_cp_table = NULL;
475
476         init_MUTEX(&sbi->hpfs_creation_de);
477
478         uid = current->uid;
479         gid = current->gid;
480         umask = current->fs->umask;
481         lowercase = 0;
482         conv = CONV_BINARY;
483         eas = 2;
484         chk = 1;
485         errs = 1;
486         chkdsk = 1;
487         timeshift = 0;
488
489         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
490             &eas, &chk, &errs, &chkdsk, &timeshift))) {
491                 printk("HPFS: bad mount options.\n");
492                 goto bail0;
493         }
494         if (o==2) {
495                 hpfs_help();
496                 goto bail0;
497         }
498
499         /*sbi->sb_mounting = 1;*/
500         sb_set_blocksize(s, 512);
501         sbi->sb_fs_size = -1;
502         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
503         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
504         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
505
506         /* Check magics */
507         if (/*bootblock->magic != BB_MAGIC
508             ||*/ superblock->magic != SB_MAGIC
509             || spareblock->magic != SP_MAGIC) {
510                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
511                 goto bail4;
512         }
513
514         /* Check version */
515         if (!(s->s_flags & MS_RDONLY) &&
516               superblock->funcversion != 2 && superblock->funcversion != 3) {
517                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
518                         (int)superblock->version, (int)superblock->funcversion);
519                 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");
520                 goto bail4;
521         }
522
523         s->s_flags |= MS_NOATIME;
524
525         /* Fill superblock stuff */
526         s->s_magic = HPFS_SUPER_MAGIC;
527         s->s_op = &hpfs_sops;
528
529         sbi->sb_root = superblock->root;
530         sbi->sb_fs_size = superblock->n_sectors;
531         sbi->sb_bitmaps = superblock->bitmaps;
532         sbi->sb_dirband_start = superblock->dir_band_start;
533         sbi->sb_dirband_size = superblock->n_dir_band;
534         sbi->sb_dmap = superblock->dir_band_bitmap;
535         sbi->sb_uid = uid;
536         sbi->sb_gid = gid;
537         sbi->sb_mode = 0777 & ~umask;
538         sbi->sb_n_free = -1;
539         sbi->sb_n_free_dnodes = -1;
540         sbi->sb_lowercase = lowercase;
541         sbi->sb_conv = conv;
542         sbi->sb_eas = eas;
543         sbi->sb_chk = chk;
544         sbi->sb_chkdsk = chkdsk;
545         sbi->sb_err = errs;
546         sbi->sb_timeshift = timeshift;
547         sbi->sb_was_error = 0;
548         sbi->sb_cp_table = NULL;
549         sbi->sb_c_bitmap = -1;
550         sbi->sb_max_fwd_alloc = 0xffffff;
551         
552         /* Load bitmap directory */
553         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
554                 goto bail4;
555         
556         /* Check for general fs errors*/
557         if (spareblock->dirty && !spareblock->old_wrote) {
558                 if (errs == 2) {
559                         printk("HPFS: Improperly stopped, not mounted\n");
560                         goto bail4;
561                 }
562                 hpfs_error(s, "improperly stopped");
563         }
564
565         if (!(s->s_flags & MS_RDONLY)) {
566                 spareblock->dirty = 1;
567                 spareblock->old_wrote = 0;
568                 mark_buffer_dirty(bh2);
569         }
570
571         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
572                 if (errs >= 2) {
573                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
574                         mark_dirty(s);
575                         goto bail4;
576                 }
577                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
578                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
579                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
580         }
581         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
582                 if (errs >= 2) {
583                         printk("HPFS: Spare dnodes used, try chkdsk\n");
584                         mark_dirty(s);
585                         goto bail4;
586                 }
587                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
588                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
589         }
590         if (chk) {
591                 unsigned a;
592                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
593                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
594                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
595                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
596                         goto bail4;
597                 }
598                 a = sbi->sb_dirband_size;
599                 sbi->sb_dirband_size = 0;
600                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
601                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
602                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
603                         mark_dirty(s);
604                         goto bail4;
605                 }
606                 sbi->sb_dirband_size = a;
607         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
608
609         /* Load code page table */
610         if (spareblock->n_code_pages)
611                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
612                         printk("HPFS: Warning: code page support is disabled\n");
613
614         brelse(bh2);
615         brelse(bh1);
616         brelse(bh0);
617
618         root = iget_locked(s, sbi->sb_root);
619         if (!root)
620                 goto bail0;
621         hpfs_init_inode(root);
622         hpfs_read_inode(root);
623         unlock_new_inode(root);
624         s->s_root = d_alloc_root(root);
625         if (!s->s_root) {
626                 iput(root);
627                 goto bail0;
628         }
629         hpfs_set_dentry_operations(s->s_root);
630
631         /*
632          * find the root directory's . pointer & finish filling in the inode
633          */
634
635         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
636         if (root_dno)
637                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
638         if (!de)
639                 hpfs_error(s, "unable to find root dir");
640         else {
641                 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
642                 root->i_atime.tv_nsec = 0;
643                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
644                 root->i_mtime.tv_nsec = 0;
645                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
646                 root->i_ctime.tv_nsec = 0;
647                 hpfs_i(root)->i_ea_size = de->ea_size;
648                 hpfs_i(root)->i_parent_dir = root->i_ino;
649                 if (root->i_size == -1)
650                         root->i_size = 2048;
651                 if (root->i_blocks == -1)
652                         root->i_blocks = 5;
653                 hpfs_brelse4(&qbh);
654         }
655         return 0;
656
657 bail4:  brelse(bh2);
658 bail3:  brelse(bh1);
659 bail2:  brelse(bh0);
660 bail1:
661 bail0:
662         kfree(sbi->sb_bmp_dir);
663         kfree(sbi->sb_cp_table);
664         s->s_fs_info = NULL;
665         kfree(sbi);
666         return -EINVAL;
667 }
668
669 static int hpfs_get_sb(struct file_system_type *fs_type,
670         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
671 {
672         return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
673                            mnt);
674 }
675
676 static struct file_system_type hpfs_fs_type = {
677         .owner          = THIS_MODULE,
678         .name           = "hpfs",
679         .get_sb         = hpfs_get_sb,
680         .kill_sb        = kill_block_super,
681         .fs_flags       = FS_REQUIRES_DEV,
682 };
683
684 static int __init init_hpfs_fs(void)
685 {
686         int err = init_inodecache();
687         if (err)
688                 goto out1;
689         err = register_filesystem(&hpfs_fs_type);
690         if (err)
691                 goto out;
692         return 0;
693 out:
694         destroy_inodecache();
695 out1:
696         return err;
697 }
698
699 static void __exit exit_hpfs_fs(void)
700 {
701         unregister_filesystem(&hpfs_fs_type);
702         destroy_inodecache();
703 }
704
705 module_init(init_hpfs_fs)
706 module_exit(exit_hpfs_fs)
707 MODULE_LICENSE("GPL");