Merge branch 'for-2.6.39' of git://linux-nfs.org/~bfields/linux
[pandora-kernel.git] / 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 #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)
22 {
23         if (hpfs_sb(s)->sb_chkdsk && !(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                         brelse(bh);
31                 }
32         }
33 }
34
35 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
36    were errors) */
37
38 static void unmark_dirty(struct super_block *s)
39 {
40         struct buffer_head *bh;
41         struct hpfs_spare_block *sb;
42         if (s->s_flags & MS_RDONLY) return;
43         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
44                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
45                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
46                 mark_buffer_dirty(bh);
47                 brelse(bh);
48         }
49 }
50
51 /* Filesystem error... */
52 static char err_buf[1024];
53
54 void hpfs_error(struct super_block *s, const char *fmt, ...)
55 {
56         va_list args;
57
58         va_start(args, fmt);
59         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
60         va_end(args);
61
62         printk("HPFS: filesystem error: %s", err_buf);
63         if (!hpfs_sb(s)->sb_was_error) {
64                 if (hpfs_sb(s)->sb_err == 2) {
65                         printk("; crashing the system because you wanted it\n");
66                         mark_dirty(s);
67                         panic("HPFS panic");
68                 } else if (hpfs_sb(s)->sb_err == 1) {
69                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
70                         else {
71                                 printk("; remounting read-only\n");
72                                 mark_dirty(s);
73                                 s->s_flags |= MS_RDONLY;
74                         }
75                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
76                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
77         } else printk("\n");
78         hpfs_sb(s)->sb_was_error = 1;
79 }
80
81 /* 
82  * A little trick to detect cycles in many hpfs structures and don't let the
83  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
84  *
85  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
86  * nested each in other, chkdsk locked up happilly.
87  */
88
89 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
90                 char *msg)
91 {
92         if (*c2 && *c1 == key) {
93                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
94                 return 1;
95         }
96         (*c2)++;
97         if (!((*c2 - 1) & *c2)) *c1 = key;
98         return 0;
99 }
100
101 static void hpfs_put_super(struct super_block *s)
102 {
103         struct hpfs_sb_info *sbi = hpfs_sb(s);
104
105         kfree(sbi->sb_cp_table);
106         kfree(sbi->sb_bmp_dir);
107         unmark_dirty(s);
108         s->s_fs_info = NULL;
109         kfree(sbi);
110 }
111
112 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
113 {
114         struct quad_buffer_head qbh;
115         unsigned long *bits;
116         unsigned count;
117
118         bits = hpfs_map_4sectors(s, secno, &qbh, 4);
119         if (!bits)
120                 return 0;
121         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
122         hpfs_brelse4(&qbh);
123         return count;
124 }
125
126 static unsigned count_bitmaps(struct super_block *s)
127 {
128         unsigned n, count, n_bands;
129         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
130         count = 0;
131         for (n = 0; n < n_bands; n++)
132                 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
133         return count;
134 }
135
136 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
137 {
138         struct super_block *s = dentry->d_sb;
139         struct hpfs_sb_info *sbi = hpfs_sb(s);
140         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
141         hpfs_lock(s);
142
143         /*if (sbi->sb_n_free == -1) {*/
144                 sbi->sb_n_free = count_bitmaps(s);
145                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
146         /*}*/
147         buf->f_type = s->s_magic;
148         buf->f_bsize = 512;
149         buf->f_blocks = sbi->sb_fs_size;
150         buf->f_bfree = sbi->sb_n_free;
151         buf->f_bavail = sbi->sb_n_free;
152         buf->f_files = sbi->sb_dirband_size / 4;
153         buf->f_ffree = sbi->sb_n_free_dnodes;
154         buf->f_fsid.val[0] = (u32)id;
155         buf->f_fsid.val[1] = (u32)(id >> 32);
156         buf->f_namelen = 254;
157
158         hpfs_unlock(s);
159
160         return 0;
161 }
162
163 static struct kmem_cache * hpfs_inode_cachep;
164
165 static struct inode *hpfs_alloc_inode(struct super_block *sb)
166 {
167         struct hpfs_inode_info *ei;
168         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
169         if (!ei)
170                 return NULL;
171         ei->vfs_inode.i_version = 1;
172         return &ei->vfs_inode;
173 }
174
175 static void hpfs_i_callback(struct rcu_head *head)
176 {
177         struct inode *inode = container_of(head, struct inode, i_rcu);
178         INIT_LIST_HEAD(&inode->i_dentry);
179         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
180 }
181
182 static void hpfs_destroy_inode(struct inode *inode)
183 {
184         call_rcu(&inode->i_rcu, hpfs_i_callback);
185 }
186
187 static void init_once(void *foo)
188 {
189         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
190
191         mutex_init(&ei->i_mutex);
192         mutex_init(&ei->i_parent_mutex);
193         inode_init_once(&ei->vfs_inode);
194 }
195
196 static int init_inodecache(void)
197 {
198         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
199                                              sizeof(struct hpfs_inode_info),
200                                              0, (SLAB_RECLAIM_ACCOUNT|
201                                                 SLAB_MEM_SPREAD),
202                                              init_once);
203         if (hpfs_inode_cachep == NULL)
204                 return -ENOMEM;
205         return 0;
206 }
207
208 static void destroy_inodecache(void)
209 {
210         kmem_cache_destroy(hpfs_inode_cachep);
211 }
212
213 /*
214  * A tiny parser for option strings, stolen from dosfs.
215  * Stolen again from read-only hpfs.
216  * And updated for table-driven option parsing.
217  */
218
219 enum {
220         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
221         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
222         Opt_check_none, Opt_check_normal, Opt_check_strict,
223         Opt_err_cont, Opt_err_ro, Opt_err_panic,
224         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
225         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
226         Opt_timeshift, Opt_err,
227 };
228
229 static const match_table_t tokens = {
230         {Opt_help, "help"},
231         {Opt_uid, "uid=%u"},
232         {Opt_gid, "gid=%u"},
233         {Opt_umask, "umask=%o"},
234         {Opt_case_lower, "case=lower"},
235         {Opt_case_asis, "case=asis"},
236         {Opt_conv_binary, "conv=binary"},
237         {Opt_conv_text, "conv=text"},
238         {Opt_conv_auto, "conv=auto"},
239         {Opt_check_none, "check=none"},
240         {Opt_check_normal, "check=normal"},
241         {Opt_check_strict, "check=strict"},
242         {Opt_err_cont, "errors=continue"},
243         {Opt_err_ro, "errors=remount-ro"},
244         {Opt_err_panic, "errors=panic"},
245         {Opt_eas_no, "eas=no"},
246         {Opt_eas_ro, "eas=ro"},
247         {Opt_eas_rw, "eas=rw"},
248         {Opt_chkdsk_no, "chkdsk=no"},
249         {Opt_chkdsk_errors, "chkdsk=errors"},
250         {Opt_chkdsk_always, "chkdsk=always"},
251         {Opt_timeshift, "timeshift=%d"},
252         {Opt_err, NULL},
253 };
254
255 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
256                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
257                       int *chkdsk, int *timeshift)
258 {
259         char *p;
260         int option;
261
262         if (!opts)
263                 return 1;
264
265         /*printk("Parsing opts: '%s'\n",opts);*/
266
267         while ((p = strsep(&opts, ",")) != NULL) {
268                 substring_t args[MAX_OPT_ARGS];
269                 int token;
270                 if (!*p)
271                         continue;
272
273                 token = match_token(p, tokens, args);
274                 switch (token) {
275                 case Opt_help:
276                         return 2;
277                 case Opt_uid:
278                         if (match_int(args, &option))
279                                 return 0;
280                         *uid = option;
281                         break;
282                 case Opt_gid:
283                         if (match_int(args, &option))
284                                 return 0;
285                         *gid = option;
286                         break;
287                 case Opt_umask:
288                         if (match_octal(args, &option))
289                                 return 0;
290                         *umask = option;
291                         break;
292                 case Opt_case_lower:
293                         *lowercase = 1;
294                         break;
295                 case Opt_case_asis:
296                         *lowercase = 0;
297                         break;
298                 case Opt_conv_binary:
299                         *conv = CONV_BINARY;
300                         break;
301                 case Opt_conv_text:
302                         *conv = CONV_TEXT;
303                         break;
304                 case Opt_conv_auto:
305                         *conv = CONV_AUTO;
306                         break;
307                 case Opt_check_none:
308                         *chk = 0;
309                         break;
310                 case Opt_check_normal:
311                         *chk = 1;
312                         break;
313                 case Opt_check_strict:
314                         *chk = 2;
315                         break;
316                 case Opt_err_cont:
317                         *errs = 0;
318                         break;
319                 case Opt_err_ro:
320                         *errs = 1;
321                         break;
322                 case Opt_err_panic:
323                         *errs = 2;
324                         break;
325                 case Opt_eas_no:
326                         *eas = 0;
327                         break;
328                 case Opt_eas_ro:
329                         *eas = 1;
330                         break;
331                 case Opt_eas_rw:
332                         *eas = 2;
333                         break;
334                 case Opt_chkdsk_no:
335                         *chkdsk = 0;
336                         break;
337                 case Opt_chkdsk_errors:
338                         *chkdsk = 1;
339                         break;
340                 case Opt_chkdsk_always:
341                         *chkdsk = 2;
342                         break;
343                 case Opt_timeshift:
344                 {
345                         int m = 1;
346                         char *rhs = args[0].from;
347                         if (!rhs || !*rhs)
348                                 return 0;
349                         if (*rhs == '-') m = -1;
350                         if (*rhs == '+' || *rhs == '-') rhs++;
351                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
352                         if (*rhs)
353                                 return 0;
354                         break;
355                 }
356                 default:
357                         return 0;
358                 }
359         }
360         return 1;
361 }
362
363 static inline void hpfs_help(void)
364 {
365         printk("\n\
366 HPFS filesystem options:\n\
367       help              do not mount and display this text\n\
368       uid=xxx           set uid of files that don't have uid specified in eas\n\
369       gid=xxx           set gid of files that don't have gid specified in eas\n\
370       umask=xxx         set mode of files that don't have mode specified in eas\n\
371       case=lower        lowercase all files\n\
372       case=asis         do not lowercase files (default)\n\
373       conv=binary       do not convert CR/LF -> LF (default)\n\
374       conv=auto         convert only files with known text extensions\n\
375       conv=text         convert all files\n\
376       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
377       check=normal      do some checks - it should not crash (default)\n\
378       check=strict      do extra time-consuming checks, used for debugging\n\
379       errors=continue   continue on errors\n\
380       errors=remount-ro remount read-only if errors found (default)\n\
381       errors=panic      panic on errors\n\
382       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
383       chkdsk=errors     mark fs dirty if errors found (default)\n\
384       chkdsk=always     always mark fs dirty - used for debugging\n\
385       eas=no            ignore extended attributes\n\
386       eas=ro            read but do not write extended attributes\n\
387       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
388       timeshift=nnn     add nnn seconds to file times\n\
389 \n");
390 }
391
392 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
393 {
394         uid_t uid;
395         gid_t gid;
396         umode_t umask;
397         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
398         int o;
399         struct hpfs_sb_info *sbi = hpfs_sb(s);
400         char *new_opts = kstrdup(data, GFP_KERNEL);
401         
402         *flags |= MS_NOATIME;
403         
404         hpfs_lock(s);
405         lock_super(s);
406         uid = sbi->sb_uid; gid = sbi->sb_gid;
407         umask = 0777 & ~sbi->sb_mode;
408         lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
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, &conv,
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; sbi->sb_conv = conv;
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);
435
436         replace_mount_options(s, new_opts);
437
438         unlock_super(s);
439         hpfs_unlock(s);
440         return 0;
441
442 out_err:
443         unlock_super(s);
444         hpfs_unlock(s);
445         kfree(new_opts);
446         return -EINVAL;
447 }
448
449 /* Super operations */
450
451 static const struct super_operations hpfs_sops =
452 {
453         .alloc_inode    = hpfs_alloc_inode,
454         .destroy_inode  = hpfs_destroy_inode,
455         .evict_inode    = hpfs_evict_inode,
456         .put_super      = hpfs_put_super,
457         .statfs         = hpfs_statfs,
458         .remount_fs     = hpfs_remount_fs,
459         .show_options   = generic_show_options,
460 };
461
462 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
463 {
464         struct buffer_head *bh0, *bh1, *bh2;
465         struct hpfs_boot_block *bootblock;
466         struct hpfs_super_block *superblock;
467         struct hpfs_spare_block *spareblock;
468         struct hpfs_sb_info *sbi;
469         struct inode *root;
470
471         uid_t uid;
472         gid_t gid;
473         umode_t umask;
474         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
475
476         dnode_secno root_dno;
477         struct hpfs_dirent *de = NULL;
478         struct quad_buffer_head qbh;
479
480         int o;
481
482         if (num_possible_cpus() > 1) {
483                 printk(KERN_ERR "HPFS is not SMP safe\n");
484                 return -EINVAL;
485         }
486
487         save_mount_options(s, options);
488
489         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
490         if (!sbi) {
491                 return -ENOMEM;
492         }
493         s->s_fs_info = sbi;
494
495         sbi->sb_bmp_dir = NULL;
496         sbi->sb_cp_table = NULL;
497
498         mutex_init(&sbi->hpfs_creation_de);
499
500         uid = current_uid();
501         gid = current_gid();
502         umask = current_umask();
503         lowercase = 0;
504         conv = CONV_BINARY;
505         eas = 2;
506         chk = 1;
507         errs = 1;
508         chkdsk = 1;
509         timeshift = 0;
510
511         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
512             &eas, &chk, &errs, &chkdsk, &timeshift))) {
513                 printk("HPFS: bad mount options.\n");
514                 goto bail0;
515         }
516         if (o==2) {
517                 hpfs_help();
518                 goto bail0;
519         }
520
521         /*sbi->sb_mounting = 1;*/
522         sb_set_blocksize(s, 512);
523         sbi->sb_fs_size = -1;
524         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
525         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
526         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
527
528         /* Check magics */
529         if (/*bootblock->magic != BB_MAGIC
530             ||*/ superblock->magic != SB_MAGIC
531             || spareblock->magic != SP_MAGIC) {
532                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
533                 goto bail4;
534         }
535
536         /* Check version */
537         if (!(s->s_flags & MS_RDONLY) &&
538               superblock->funcversion != 2 && superblock->funcversion != 3) {
539                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
540                         (int)superblock->version, (int)superblock->funcversion);
541                 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");
542                 goto bail4;
543         }
544
545         s->s_flags |= MS_NOATIME;
546
547         /* Fill superblock stuff */
548         s->s_magic = HPFS_SUPER_MAGIC;
549         s->s_op = &hpfs_sops;
550         s->s_d_op = &hpfs_dentry_operations;
551
552         sbi->sb_root = superblock->root;
553         sbi->sb_fs_size = superblock->n_sectors;
554         sbi->sb_bitmaps = superblock->bitmaps;
555         sbi->sb_dirband_start = superblock->dir_band_start;
556         sbi->sb_dirband_size = superblock->n_dir_band;
557         sbi->sb_dmap = superblock->dir_band_bitmap;
558         sbi->sb_uid = uid;
559         sbi->sb_gid = gid;
560         sbi->sb_mode = 0777 & ~umask;
561         sbi->sb_n_free = -1;
562         sbi->sb_n_free_dnodes = -1;
563         sbi->sb_lowercase = lowercase;
564         sbi->sb_conv = conv;
565         sbi->sb_eas = eas;
566         sbi->sb_chk = chk;
567         sbi->sb_chkdsk = chkdsk;
568         sbi->sb_err = errs;
569         sbi->sb_timeshift = timeshift;
570         sbi->sb_was_error = 0;
571         sbi->sb_cp_table = NULL;
572         sbi->sb_c_bitmap = -1;
573         sbi->sb_max_fwd_alloc = 0xffffff;
574         
575         /* Load bitmap directory */
576         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
577                 goto bail4;
578         
579         /* Check for general fs errors*/
580         if (spareblock->dirty && !spareblock->old_wrote) {
581                 if (errs == 2) {
582                         printk("HPFS: Improperly stopped, not mounted\n");
583                         goto bail4;
584                 }
585                 hpfs_error(s, "improperly stopped");
586         }
587
588         if (!(s->s_flags & MS_RDONLY)) {
589                 spareblock->dirty = 1;
590                 spareblock->old_wrote = 0;
591                 mark_buffer_dirty(bh2);
592         }
593
594         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
595                 if (errs >= 2) {
596                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
597                         mark_dirty(s);
598                         goto bail4;
599                 }
600                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
601                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
602                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
603         }
604         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
605                 if (errs >= 2) {
606                         printk("HPFS: Spare dnodes used, try chkdsk\n");
607                         mark_dirty(s);
608                         goto bail4;
609                 }
610                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
611                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
612         }
613         if (chk) {
614                 unsigned a;
615                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
616                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
617                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
618                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
619                         goto bail4;
620                 }
621                 a = sbi->sb_dirband_size;
622                 sbi->sb_dirband_size = 0;
623                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
624                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
625                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
626                         mark_dirty(s);
627                         goto bail4;
628                 }
629                 sbi->sb_dirband_size = a;
630         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
631
632         /* Load code page table */
633         if (spareblock->n_code_pages)
634                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
635                         printk("HPFS: Warning: code page support is disabled\n");
636
637         brelse(bh2);
638         brelse(bh1);
639         brelse(bh0);
640
641         root = iget_locked(s, sbi->sb_root);
642         if (!root)
643                 goto bail0;
644         hpfs_init_inode(root);
645         hpfs_read_inode(root);
646         unlock_new_inode(root);
647         s->s_root = d_alloc_root(root);
648         if (!s->s_root) {
649                 iput(root);
650                 goto bail0;
651         }
652
653         /*
654          * find the root directory's . pointer & finish filling in the inode
655          */
656
657         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
658         if (root_dno)
659                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
660         if (!de)
661                 hpfs_error(s, "unable to find root dir");
662         else {
663                 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
664                 root->i_atime.tv_nsec = 0;
665                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
666                 root->i_mtime.tv_nsec = 0;
667                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
668                 root->i_ctime.tv_nsec = 0;
669                 hpfs_i(root)->i_ea_size = de->ea_size;
670                 hpfs_i(root)->i_parent_dir = root->i_ino;
671                 if (root->i_size == -1)
672                         root->i_size = 2048;
673                 if (root->i_blocks == -1)
674                         root->i_blocks = 5;
675                 hpfs_brelse4(&qbh);
676         }
677         return 0;
678
679 bail4:  brelse(bh2);
680 bail3:  brelse(bh1);
681 bail2:  brelse(bh0);
682 bail1:
683 bail0:
684         kfree(sbi->sb_bmp_dir);
685         kfree(sbi->sb_cp_table);
686         s->s_fs_info = NULL;
687         kfree(sbi);
688         return -EINVAL;
689 }
690
691 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
692         int flags, const char *dev_name, void *data)
693 {
694         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
695 }
696
697 static struct file_system_type hpfs_fs_type = {
698         .owner          = THIS_MODULE,
699         .name           = "hpfs",
700         .mount          = hpfs_mount,
701         .kill_sb        = kill_block_super,
702         .fs_flags       = FS_REQUIRES_DEV,
703 };
704
705 static int __init init_hpfs_fs(void)
706 {
707         int err = init_inodecache();
708         if (err)
709                 goto out1;
710         err = register_filesystem(&hpfs_fs_type);
711         if (err)
712                 goto out;
713         return 0;
714 out:
715         destroy_inodecache();
716 out1:
717         return err;
718 }
719
720 static void __exit exit_hpfs_fs(void)
721 {
722         unregister_filesystem(&hpfs_fs_type);
723         destroy_inodecache();
724 }
725
726 module_init(init_hpfs_fs)
727 module_exit(exit_hpfs_fs)
728 MODULE_LICENSE("GPL");