Merge branch 'linux-linaro-lsk-v3.10' into linux-linaro-lsk-v3.10-android
[firefly-linux-kernel-4.4.55.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, 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 void hpfs_error(struct super_block *s, const char *fmt, ...)
56 {
57         struct va_format vaf;
58         va_list args;
59
60         va_start(args, fmt);
61
62         vaf.fmt = fmt;
63         vaf.va = &args;
64
65         pr_err("filesystem error: %pV", &vaf);
66
67         va_end(args);
68
69         if (!hpfs_sb(s)->sb_was_error) {
70                 if (hpfs_sb(s)->sb_err == 2) {
71                         printk("; crashing the system because you wanted it\n");
72                         mark_dirty(s, 0);
73                         panic("HPFS panic");
74                 } else if (hpfs_sb(s)->sb_err == 1) {
75                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
76                         else {
77                                 printk("; remounting read-only\n");
78                                 mark_dirty(s, 0);
79                                 s->s_flags |= MS_RDONLY;
80                         }
81                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
82                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
83         } else printk("\n");
84         hpfs_sb(s)->sb_was_error = 1;
85 }
86
87 /* 
88  * A little trick to detect cycles in many hpfs structures and don't let the
89  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
90  *
91  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
92  * nested each in other, chkdsk locked up happilly.
93  */
94
95 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
96                 char *msg)
97 {
98         if (*c2 && *c1 == key) {
99                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
100                 return 1;
101         }
102         (*c2)++;
103         if (!((*c2 - 1) & *c2)) *c1 = key;
104         return 0;
105 }
106
107 static void hpfs_put_super(struct super_block *s)
108 {
109         struct hpfs_sb_info *sbi = hpfs_sb(s);
110
111         hpfs_lock(s);
112         unmark_dirty(s);
113         hpfs_unlock(s);
114
115         kfree(sbi->sb_cp_table);
116         kfree(sbi->sb_bmp_dir);
117         s->s_fs_info = NULL;
118         kfree(sbi);
119 }
120
121 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
122 {
123         struct quad_buffer_head qbh;
124         unsigned long *bits;
125         unsigned count;
126
127         bits = hpfs_map_4sectors(s, secno, &qbh, 4);
128         if (!bits)
129                 return 0;
130         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
131         hpfs_brelse4(&qbh);
132         return count;
133 }
134
135 static unsigned count_bitmaps(struct super_block *s)
136 {
137         unsigned n, count, n_bands;
138         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
139         count = 0;
140         for (n = 0; n < n_bands; n++)
141                 count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
142         return count;
143 }
144
145 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
146 {
147         struct super_block *s = dentry->d_sb;
148         struct hpfs_sb_info *sbi = hpfs_sb(s);
149         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
150         hpfs_lock(s);
151
152         /*if (sbi->sb_n_free == -1) {*/
153                 sbi->sb_n_free = count_bitmaps(s);
154                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
155         /*}*/
156         buf->f_type = s->s_magic;
157         buf->f_bsize = 512;
158         buf->f_blocks = sbi->sb_fs_size;
159         buf->f_bfree = sbi->sb_n_free;
160         buf->f_bavail = sbi->sb_n_free;
161         buf->f_files = sbi->sb_dirband_size / 4;
162         buf->f_ffree = sbi->sb_n_free_dnodes;
163         buf->f_fsid.val[0] = (u32)id;
164         buf->f_fsid.val[1] = (u32)(id >> 32);
165         buf->f_namelen = 254;
166
167         hpfs_unlock(s);
168
169         return 0;
170 }
171
172 static struct kmem_cache * hpfs_inode_cachep;
173
174 static struct inode *hpfs_alloc_inode(struct super_block *sb)
175 {
176         struct hpfs_inode_info *ei;
177         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
178         if (!ei)
179                 return NULL;
180         ei->vfs_inode.i_version = 1;
181         return &ei->vfs_inode;
182 }
183
184 static void hpfs_i_callback(struct rcu_head *head)
185 {
186         struct inode *inode = container_of(head, struct inode, i_rcu);
187         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
188 }
189
190 static void hpfs_destroy_inode(struct inode *inode)
191 {
192         call_rcu(&inode->i_rcu, hpfs_i_callback);
193 }
194
195 static void init_once(void *foo)
196 {
197         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
198
199         inode_init_once(&ei->vfs_inode);
200 }
201
202 static int init_inodecache(void)
203 {
204         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
205                                              sizeof(struct hpfs_inode_info),
206                                              0, (SLAB_RECLAIM_ACCOUNT|
207                                                 SLAB_MEM_SPREAD),
208                                              init_once);
209         if (hpfs_inode_cachep == NULL)
210                 return -ENOMEM;
211         return 0;
212 }
213
214 static void destroy_inodecache(void)
215 {
216         /*
217          * Make sure all delayed rcu free inodes are flushed before we
218          * destroy cache.
219          */
220         rcu_barrier();
221         kmem_cache_destroy(hpfs_inode_cachep);
222 }
223
224 /*
225  * A tiny parser for option strings, stolen from dosfs.
226  * Stolen again from read-only hpfs.
227  * And updated for table-driven option parsing.
228  */
229
230 enum {
231         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
232         Opt_check_none, Opt_check_normal, Opt_check_strict,
233         Opt_err_cont, Opt_err_ro, Opt_err_panic,
234         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
235         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
236         Opt_timeshift, Opt_err,
237 };
238
239 static const match_table_t tokens = {
240         {Opt_help, "help"},
241         {Opt_uid, "uid=%u"},
242         {Opt_gid, "gid=%u"},
243         {Opt_umask, "umask=%o"},
244         {Opt_case_lower, "case=lower"},
245         {Opt_case_asis, "case=asis"},
246         {Opt_check_none, "check=none"},
247         {Opt_check_normal, "check=normal"},
248         {Opt_check_strict, "check=strict"},
249         {Opt_err_cont, "errors=continue"},
250         {Opt_err_ro, "errors=remount-ro"},
251         {Opt_err_panic, "errors=panic"},
252         {Opt_eas_no, "eas=no"},
253         {Opt_eas_ro, "eas=ro"},
254         {Opt_eas_rw, "eas=rw"},
255         {Opt_chkdsk_no, "chkdsk=no"},
256         {Opt_chkdsk_errors, "chkdsk=errors"},
257         {Opt_chkdsk_always, "chkdsk=always"},
258         {Opt_timeshift, "timeshift=%d"},
259         {Opt_err, NULL},
260 };
261
262 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
263                       int *lowercase, int *eas, int *chk, int *errs,
264                       int *chkdsk, int *timeshift)
265 {
266         char *p;
267         int option;
268
269         if (!opts)
270                 return 1;
271
272         /*printk("Parsing opts: '%s'\n",opts);*/
273
274         while ((p = strsep(&opts, ",")) != NULL) {
275                 substring_t args[MAX_OPT_ARGS];
276                 int token;
277                 if (!*p)
278                         continue;
279
280                 token = match_token(p, tokens, args);
281                 switch (token) {
282                 case Opt_help:
283                         return 2;
284                 case Opt_uid:
285                         if (match_int(args, &option))
286                                 return 0;
287                         *uid = make_kuid(current_user_ns(), option);
288                         if (!uid_valid(*uid))
289                                 return 0;
290                         break;
291                 case Opt_gid:
292                         if (match_int(args, &option))
293                                 return 0;
294                         *gid = make_kgid(current_user_ns(), option);
295                         if (!gid_valid(*gid))
296                                 return 0;
297                         break;
298                 case Opt_umask:
299                         if (match_octal(args, &option))
300                                 return 0;
301                         *umask = option;
302                         break;
303                 case Opt_case_lower:
304                         *lowercase = 1;
305                         break;
306                 case Opt_case_asis:
307                         *lowercase = 0;
308                         break;
309                 case Opt_check_none:
310                         *chk = 0;
311                         break;
312                 case Opt_check_normal:
313                         *chk = 1;
314                         break;
315                 case Opt_check_strict:
316                         *chk = 2;
317                         break;
318                 case Opt_err_cont:
319                         *errs = 0;
320                         break;
321                 case Opt_err_ro:
322                         *errs = 1;
323                         break;
324                 case Opt_err_panic:
325                         *errs = 2;
326                         break;
327                 case Opt_eas_no:
328                         *eas = 0;
329                         break;
330                 case Opt_eas_ro:
331                         *eas = 1;
332                         break;
333                 case Opt_eas_rw:
334                         *eas = 2;
335                         break;
336                 case Opt_chkdsk_no:
337                         *chkdsk = 0;
338                         break;
339                 case Opt_chkdsk_errors:
340                         *chkdsk = 1;
341                         break;
342                 case Opt_chkdsk_always:
343                         *chkdsk = 2;
344                         break;
345                 case Opt_timeshift:
346                 {
347                         int m = 1;
348                         char *rhs = args[0].from;
349                         if (!rhs || !*rhs)
350                                 return 0;
351                         if (*rhs == '-') m = -1;
352                         if (*rhs == '+' || *rhs == '-') rhs++;
353                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
354                         if (*rhs)
355                                 return 0;
356                         break;
357                 }
358                 default:
359                         return 0;
360                 }
361         }
362         return 1;
363 }
364
365 static inline void hpfs_help(void)
366 {
367         printk("\n\
368 HPFS filesystem options:\n\
369       help              do not mount and display this text\n\
370       uid=xxx           set uid of files that don't have uid specified in eas\n\
371       gid=xxx           set gid of files that don't have gid specified in eas\n\
372       umask=xxx         set mode of files that don't have mode specified in eas\n\
373       case=lower        lowercase all files\n\
374       case=asis         do not lowercase files (default)\n\
375       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
376       check=normal      do some checks - it should not crash (default)\n\
377       check=strict      do extra time-consuming checks, used for debugging\n\
378       errors=continue   continue on errors\n\
379       errors=remount-ro remount read-only if errors found (default)\n\
380       errors=panic      panic on errors\n\
381       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
382       chkdsk=errors     mark fs dirty if errors found (default)\n\
383       chkdsk=always     always mark fs dirty - used for debugging\n\
384       eas=no            ignore extended attributes\n\
385       eas=ro            read but do not write extended attributes\n\
386       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
387       timeshift=nnn     add nnn seconds to file times\n\
388 \n");
389 }
390
391 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
392 {
393         kuid_t uid;
394         kgid_t gid;
395         umode_t umask;
396         int lowercase, eas, chk, errs, chkdsk, timeshift;
397         int o;
398         struct hpfs_sb_info *sbi = hpfs_sb(s);
399         char *new_opts = kstrdup(data, GFP_KERNEL);
400         
401         sync_filesystem(s);
402
403         *flags |= MS_NOATIME;
404         
405         hpfs_lock(s);
406         uid = sbi->sb_uid; gid = sbi->sb_gid;
407         umask = 0777 & ~sbi->sb_mode;
408         lowercase = sbi->sb_lowercase;
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,
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;
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, 1);
435
436         replace_mount_options(s, new_opts);
437
438         hpfs_unlock(s);
439         return 0;
440
441 out_err:
442         hpfs_unlock(s);
443         kfree(new_opts);
444         return -EINVAL;
445 }
446
447 /* Super operations */
448
449 static const struct super_operations hpfs_sops =
450 {
451         .alloc_inode    = hpfs_alloc_inode,
452         .destroy_inode  = hpfs_destroy_inode,
453         .evict_inode    = hpfs_evict_inode,
454         .put_super      = hpfs_put_super,
455         .statfs         = hpfs_statfs,
456         .remount_fs     = hpfs_remount_fs,
457         .show_options   = generic_show_options,
458 };
459
460 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
461 {
462         struct buffer_head *bh0, *bh1, *bh2;
463         struct hpfs_boot_block *bootblock;
464         struct hpfs_super_block *superblock;
465         struct hpfs_spare_block *spareblock;
466         struct hpfs_sb_info *sbi;
467         struct inode *root;
468
469         kuid_t uid;
470         kgid_t gid;
471         umode_t umask;
472         int lowercase, eas, chk, errs, chkdsk, timeshift;
473
474         dnode_secno root_dno;
475         struct hpfs_dirent *de = NULL;
476         struct quad_buffer_head qbh;
477
478         int o;
479
480         save_mount_options(s, options);
481
482         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
483         if (!sbi) {
484                 return -ENOMEM;
485         }
486         s->s_fs_info = sbi;
487
488         sbi->sb_bmp_dir = NULL;
489         sbi->sb_cp_table = NULL;
490
491         mutex_init(&sbi->hpfs_mutex);
492         hpfs_lock(s);
493
494         uid = current_uid();
495         gid = current_gid();
496         umask = current_umask();
497         lowercase = 0;
498         eas = 2;
499         chk = 1;
500         errs = 1;
501         chkdsk = 1;
502         timeshift = 0;
503
504         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
505             &eas, &chk, &errs, &chkdsk, &timeshift))) {
506                 printk("HPFS: bad mount options.\n");
507                 goto bail0;
508         }
509         if (o==2) {
510                 hpfs_help();
511                 goto bail0;
512         }
513
514         /*sbi->sb_mounting = 1;*/
515         sb_set_blocksize(s, 512);
516         sbi->sb_fs_size = -1;
517         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
518         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
519         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
520
521         /* Check magics */
522         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
523             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
524             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
525                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
526                 goto bail4;
527         }
528
529         /* Check version */
530         if (!(s->s_flags & MS_RDONLY) &&
531               superblock->funcversion != 2 && superblock->funcversion != 3) {
532                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
533                         (int)superblock->version, (int)superblock->funcversion);
534                 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");
535                 goto bail4;
536         }
537
538         s->s_flags |= MS_NOATIME;
539
540         /* Fill superblock stuff */
541         s->s_magic = HPFS_SUPER_MAGIC;
542         s->s_op = &hpfs_sops;
543         s->s_d_op = &hpfs_dentry_operations;
544
545         sbi->sb_root = le32_to_cpu(superblock->root);
546         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
547         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
548         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
549         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
550         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
551         sbi->sb_uid = uid;
552         sbi->sb_gid = gid;
553         sbi->sb_mode = 0777 & ~umask;
554         sbi->sb_n_free = -1;
555         sbi->sb_n_free_dnodes = -1;
556         sbi->sb_lowercase = lowercase;
557         sbi->sb_eas = eas;
558         sbi->sb_chk = chk;
559         sbi->sb_chkdsk = chkdsk;
560         sbi->sb_err = errs;
561         sbi->sb_timeshift = timeshift;
562         sbi->sb_was_error = 0;
563         sbi->sb_cp_table = NULL;
564         sbi->sb_c_bitmap = -1;
565         sbi->sb_max_fwd_alloc = 0xffffff;
566
567         if (sbi->sb_fs_size >= 0x80000000) {
568                 hpfs_error(s, "invalid size in superblock: %08x",
569                         (unsigned)sbi->sb_fs_size);
570                 goto bail4;
571         }
572
573         /* Load bitmap directory */
574         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
575                 goto bail4;
576         
577         /* Check for general fs errors*/
578         if (spareblock->dirty && !spareblock->old_wrote) {
579                 if (errs == 2) {
580                         printk("HPFS: Improperly stopped, not mounted\n");
581                         goto bail4;
582                 }
583                 hpfs_error(s, "improperly stopped");
584         }
585
586         if (!(s->s_flags & MS_RDONLY)) {
587                 spareblock->dirty = 1;
588                 spareblock->old_wrote = 0;
589                 mark_buffer_dirty(bh2);
590         }
591
592         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
593                 if (errs >= 2) {
594                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
595                         mark_dirty(s, 0);
596                         goto bail4;
597                 }
598                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
599                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
600                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
601         }
602         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
603                 if (errs >= 2) {
604                         printk("HPFS: Spare dnodes used, try chkdsk\n");
605                         mark_dirty(s, 0);
606                         goto bail4;
607                 }
608                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
609                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
610         }
611         if (chk) {
612                 unsigned a;
613                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
614                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
615                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
616                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
617                         goto bail4;
618                 }
619                 a = sbi->sb_dirband_size;
620                 sbi->sb_dirband_size = 0;
621                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
622                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
623                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
624                         mark_dirty(s, 0);
625                         goto bail4;
626                 }
627                 sbi->sb_dirband_size = a;
628         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
629
630         /* Load code page table */
631         if (le32_to_cpu(spareblock->n_code_pages))
632                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
633                         printk("HPFS: Warning: code page support is disabled\n");
634
635         brelse(bh2);
636         brelse(bh1);
637         brelse(bh0);
638
639         root = iget_locked(s, sbi->sb_root);
640         if (!root)
641                 goto bail0;
642         hpfs_init_inode(root);
643         hpfs_read_inode(root);
644         unlock_new_inode(root);
645         s->s_root = d_make_root(root);
646         if (!s->s_root)
647                 goto bail0;
648
649         /*
650          * find the root directory's . pointer & finish filling in the inode
651          */
652
653         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
654         if (root_dno)
655                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
656         if (!de)
657                 hpfs_error(s, "unable to find root dir");
658         else {
659                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
660                 root->i_atime.tv_nsec = 0;
661                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
662                 root->i_mtime.tv_nsec = 0;
663                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
664                 root->i_ctime.tv_nsec = 0;
665                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
666                 hpfs_i(root)->i_parent_dir = root->i_ino;
667                 if (root->i_size == -1)
668                         root->i_size = 2048;
669                 if (root->i_blocks == -1)
670                         root->i_blocks = 5;
671                 hpfs_brelse4(&qbh);
672         }
673         hpfs_unlock(s);
674         return 0;
675
676 bail4:  brelse(bh2);
677 bail3:  brelse(bh1);
678 bail2:  brelse(bh0);
679 bail1:
680 bail0:
681         hpfs_unlock(s);
682         kfree(sbi->sb_bmp_dir);
683         kfree(sbi->sb_cp_table);
684         s->s_fs_info = NULL;
685         kfree(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");