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