Merge remote-tracking branch 'lsk/v3.10/topic/dma-mapping' into linux-linaro-lsk
[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 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 hpfs_put_super(struct super_block *s)
105 {
106         struct hpfs_sb_info *sbi = hpfs_sb(s);
107
108         hpfs_lock(s);
109         unmark_dirty(s);
110         hpfs_unlock(s);
111
112         kfree(sbi->sb_cp_table);
113         kfree(sbi->sb_bmp_dir);
114         s->s_fs_info = NULL;
115         kfree(sbi);
116 }
117
118 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
119 {
120         struct quad_buffer_head qbh;
121         unsigned long *bits;
122         unsigned count;
123
124         bits = hpfs_map_4sectors(s, secno, &qbh, 4);
125         if (!bits)
126                 return 0;
127         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
128         hpfs_brelse4(&qbh);
129         return count;
130 }
131
132 static unsigned count_bitmaps(struct super_block *s)
133 {
134         unsigned n, count, n_bands;
135         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
136         count = 0;
137         for (n = 0; n < n_bands; n++)
138                 count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
139         return count;
140 }
141
142 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
143 {
144         struct super_block *s = dentry->d_sb;
145         struct hpfs_sb_info *sbi = hpfs_sb(s);
146         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
147         hpfs_lock(s);
148
149         /*if (sbi->sb_n_free == -1) {*/
150                 sbi->sb_n_free = count_bitmaps(s);
151                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
152         /*}*/
153         buf->f_type = s->s_magic;
154         buf->f_bsize = 512;
155         buf->f_blocks = sbi->sb_fs_size;
156         buf->f_bfree = sbi->sb_n_free;
157         buf->f_bavail = sbi->sb_n_free;
158         buf->f_files = sbi->sb_dirband_size / 4;
159         buf->f_ffree = sbi->sb_n_free_dnodes;
160         buf->f_fsid.val[0] = (u32)id;
161         buf->f_fsid.val[1] = (u32)(id >> 32);
162         buf->f_namelen = 254;
163
164         hpfs_unlock(s);
165
166         return 0;
167 }
168
169 static struct kmem_cache * hpfs_inode_cachep;
170
171 static struct inode *hpfs_alloc_inode(struct super_block *sb)
172 {
173         struct hpfs_inode_info *ei;
174         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
175         if (!ei)
176                 return NULL;
177         ei->vfs_inode.i_version = 1;
178         return &ei->vfs_inode;
179 }
180
181 static void hpfs_i_callback(struct rcu_head *head)
182 {
183         struct inode *inode = container_of(head, struct inode, i_rcu);
184         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
185 }
186
187 static void hpfs_destroy_inode(struct inode *inode)
188 {
189         call_rcu(&inode->i_rcu, hpfs_i_callback);
190 }
191
192 static void init_once(void *foo)
193 {
194         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
195
196         inode_init_once(&ei->vfs_inode);
197 }
198
199 static int init_inodecache(void)
200 {
201         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
202                                              sizeof(struct hpfs_inode_info),
203                                              0, (SLAB_RECLAIM_ACCOUNT|
204                                                 SLAB_MEM_SPREAD),
205                                              init_once);
206         if (hpfs_inode_cachep == NULL)
207                 return -ENOMEM;
208         return 0;
209 }
210
211 static void destroy_inodecache(void)
212 {
213         /*
214          * Make sure all delayed rcu free inodes are flushed before we
215          * destroy cache.
216          */
217         rcu_barrier();
218         kmem_cache_destroy(hpfs_inode_cachep);
219 }
220
221 /*
222  * A tiny parser for option strings, stolen from dosfs.
223  * Stolen again from read-only hpfs.
224  * And updated for table-driven option parsing.
225  */
226
227 enum {
228         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
229         Opt_check_none, Opt_check_normal, Opt_check_strict,
230         Opt_err_cont, Opt_err_ro, Opt_err_panic,
231         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
232         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
233         Opt_timeshift, Opt_err,
234 };
235
236 static const match_table_t tokens = {
237         {Opt_help, "help"},
238         {Opt_uid, "uid=%u"},
239         {Opt_gid, "gid=%u"},
240         {Opt_umask, "umask=%o"},
241         {Opt_case_lower, "case=lower"},
242         {Opt_case_asis, "case=asis"},
243         {Opt_check_none, "check=none"},
244         {Opt_check_normal, "check=normal"},
245         {Opt_check_strict, "check=strict"},
246         {Opt_err_cont, "errors=continue"},
247         {Opt_err_ro, "errors=remount-ro"},
248         {Opt_err_panic, "errors=panic"},
249         {Opt_eas_no, "eas=no"},
250         {Opt_eas_ro, "eas=ro"},
251         {Opt_eas_rw, "eas=rw"},
252         {Opt_chkdsk_no, "chkdsk=no"},
253         {Opt_chkdsk_errors, "chkdsk=errors"},
254         {Opt_chkdsk_always, "chkdsk=always"},
255         {Opt_timeshift, "timeshift=%d"},
256         {Opt_err, NULL},
257 };
258
259 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
260                       int *lowercase, int *eas, int *chk, int *errs,
261                       int *chkdsk, int *timeshift)
262 {
263         char *p;
264         int option;
265
266         if (!opts)
267                 return 1;
268
269         /*printk("Parsing opts: '%s'\n",opts);*/
270
271         while ((p = strsep(&opts, ",")) != NULL) {
272                 substring_t args[MAX_OPT_ARGS];
273                 int token;
274                 if (!*p)
275                         continue;
276
277                 token = match_token(p, tokens, args);
278                 switch (token) {
279                 case Opt_help:
280                         return 2;
281                 case Opt_uid:
282                         if (match_int(args, &option))
283                                 return 0;
284                         *uid = make_kuid(current_user_ns(), option);
285                         if (!uid_valid(*uid))
286                                 return 0;
287                         break;
288                 case Opt_gid:
289                         if (match_int(args, &option))
290                                 return 0;
291                         *gid = make_kgid(current_user_ns(), option);
292                         if (!gid_valid(*gid))
293                                 return 0;
294                         break;
295                 case Opt_umask:
296                         if (match_octal(args, &option))
297                                 return 0;
298                         *umask = option;
299                         break;
300                 case Opt_case_lower:
301                         *lowercase = 1;
302                         break;
303                 case Opt_case_asis:
304                         *lowercase = 0;
305                         break;
306                 case Opt_check_none:
307                         *chk = 0;
308                         break;
309                 case Opt_check_normal:
310                         *chk = 1;
311                         break;
312                 case Opt_check_strict:
313                         *chk = 2;
314                         break;
315                 case Opt_err_cont:
316                         *errs = 0;
317                         break;
318                 case Opt_err_ro:
319                         *errs = 1;
320                         break;
321                 case Opt_err_panic:
322                         *errs = 2;
323                         break;
324                 case Opt_eas_no:
325                         *eas = 0;
326                         break;
327                 case Opt_eas_ro:
328                         *eas = 1;
329                         break;
330                 case Opt_eas_rw:
331                         *eas = 2;
332                         break;
333                 case Opt_chkdsk_no:
334                         *chkdsk = 0;
335                         break;
336                 case Opt_chkdsk_errors:
337                         *chkdsk = 1;
338                         break;
339                 case Opt_chkdsk_always:
340                         *chkdsk = 2;
341                         break;
342                 case Opt_timeshift:
343                 {
344                         int m = 1;
345                         char *rhs = args[0].from;
346                         if (!rhs || !*rhs)
347                                 return 0;
348                         if (*rhs == '-') m = -1;
349                         if (*rhs == '+' || *rhs == '-') rhs++;
350                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
351                         if (*rhs)
352                                 return 0;
353                         break;
354                 }
355                 default:
356                         return 0;
357                 }
358         }
359         return 1;
360 }
361
362 static inline void hpfs_help(void)
363 {
364         printk("\n\
365 HPFS filesystem options:\n\
366       help              do not mount and display this text\n\
367       uid=xxx           set uid of files that don't have uid specified in eas\n\
368       gid=xxx           set gid of files that don't have gid specified in eas\n\
369       umask=xxx         set mode of files that don't have mode specified in eas\n\
370       case=lower        lowercase all files\n\
371       case=asis         do not lowercase files (default)\n\
372       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
373       check=normal      do some checks - it should not crash (default)\n\
374       check=strict      do extra time-consuming checks, used for debugging\n\
375       errors=continue   continue on errors\n\
376       errors=remount-ro remount read-only if errors found (default)\n\
377       errors=panic      panic on errors\n\
378       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
379       chkdsk=errors     mark fs dirty if errors found (default)\n\
380       chkdsk=always     always mark fs dirty - used for debugging\n\
381       eas=no            ignore extended attributes\n\
382       eas=ro            read but do not write extended attributes\n\
383       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
384       timeshift=nnn     add nnn seconds to file times\n\
385 \n");
386 }
387
388 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
389 {
390         kuid_t uid;
391         kgid_t gid;
392         umode_t umask;
393         int lowercase, eas, chk, errs, chkdsk, timeshift;
394         int o;
395         struct hpfs_sb_info *sbi = hpfs_sb(s);
396         char *new_opts = kstrdup(data, GFP_KERNEL);
397         
398         *flags |= MS_NOATIME;
399         
400         hpfs_lock(s);
401         uid = sbi->sb_uid; gid = sbi->sb_gid;
402         umask = 0777 & ~sbi->sb_mode;
403         lowercase = sbi->sb_lowercase;
404         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
405         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
406
407         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
408             &eas, &chk, &errs, &chkdsk, &timeshift))) {
409                 printk("HPFS: bad mount options.\n");
410                 goto out_err;
411         }
412         if (o == 2) {
413                 hpfs_help();
414                 goto out_err;
415         }
416         if (timeshift != sbi->sb_timeshift) {
417                 printk("HPFS: timeshift can't be changed using remount.\n");
418                 goto out_err;
419         }
420
421         unmark_dirty(s);
422
423         sbi->sb_uid = uid; sbi->sb_gid = gid;
424         sbi->sb_mode = 0777 & ~umask;
425         sbi->sb_lowercase = lowercase;
426         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
427         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
428
429         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
430
431         replace_mount_options(s, new_opts);
432
433         hpfs_unlock(s);
434         return 0;
435
436 out_err:
437         hpfs_unlock(s);
438         kfree(new_opts);
439         return -EINVAL;
440 }
441
442 /* Super operations */
443
444 static const struct super_operations hpfs_sops =
445 {
446         .alloc_inode    = hpfs_alloc_inode,
447         .destroy_inode  = hpfs_destroy_inode,
448         .evict_inode    = hpfs_evict_inode,
449         .put_super      = hpfs_put_super,
450         .statfs         = hpfs_statfs,
451         .remount_fs     = hpfs_remount_fs,
452         .show_options   = generic_show_options,
453 };
454
455 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
456 {
457         struct buffer_head *bh0, *bh1, *bh2;
458         struct hpfs_boot_block *bootblock;
459         struct hpfs_super_block *superblock;
460         struct hpfs_spare_block *spareblock;
461         struct hpfs_sb_info *sbi;
462         struct inode *root;
463
464         kuid_t uid;
465         kgid_t gid;
466         umode_t umask;
467         int lowercase, eas, chk, errs, chkdsk, timeshift;
468
469         dnode_secno root_dno;
470         struct hpfs_dirent *de = NULL;
471         struct quad_buffer_head qbh;
472
473         int o;
474
475         save_mount_options(s, options);
476
477         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
478         if (!sbi) {
479                 return -ENOMEM;
480         }
481         s->s_fs_info = sbi;
482
483         sbi->sb_bmp_dir = NULL;
484         sbi->sb_cp_table = NULL;
485
486         mutex_init(&sbi->hpfs_mutex);
487         hpfs_lock(s);
488
489         uid = current_uid();
490         gid = current_gid();
491         umask = current_umask();
492         lowercase = 0;
493         eas = 2;
494         chk = 1;
495         errs = 1;
496         chkdsk = 1;
497         timeshift = 0;
498
499         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
500             &eas, &chk, &errs, &chkdsk, &timeshift))) {
501                 printk("HPFS: bad mount options.\n");
502                 goto bail0;
503         }
504         if (o==2) {
505                 hpfs_help();
506                 goto bail0;
507         }
508
509         /*sbi->sb_mounting = 1;*/
510         sb_set_blocksize(s, 512);
511         sbi->sb_fs_size = -1;
512         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
513         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
514         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
515
516         /* Check magics */
517         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
518             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
519             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
520                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
521                 goto bail4;
522         }
523
524         /* Check version */
525         if (!(s->s_flags & MS_RDONLY) &&
526               superblock->funcversion != 2 && superblock->funcversion != 3) {
527                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
528                         (int)superblock->version, (int)superblock->funcversion);
529                 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");
530                 goto bail4;
531         }
532
533         s->s_flags |= MS_NOATIME;
534
535         /* Fill superblock stuff */
536         s->s_magic = HPFS_SUPER_MAGIC;
537         s->s_op = &hpfs_sops;
538         s->s_d_op = &hpfs_dentry_operations;
539
540         sbi->sb_root = le32_to_cpu(superblock->root);
541         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
542         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
543         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
544         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
545         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
546         sbi->sb_uid = uid;
547         sbi->sb_gid = gid;
548         sbi->sb_mode = 0777 & ~umask;
549         sbi->sb_n_free = -1;
550         sbi->sb_n_free_dnodes = -1;
551         sbi->sb_lowercase = lowercase;
552         sbi->sb_eas = eas;
553         sbi->sb_chk = chk;
554         sbi->sb_chkdsk = chkdsk;
555         sbi->sb_err = errs;
556         sbi->sb_timeshift = timeshift;
557         sbi->sb_was_error = 0;
558         sbi->sb_cp_table = NULL;
559         sbi->sb_c_bitmap = -1;
560         sbi->sb_max_fwd_alloc = 0xffffff;
561
562         if (sbi->sb_fs_size >= 0x80000000) {
563                 hpfs_error(s, "invalid size in superblock: %08x",
564                         (unsigned)sbi->sb_fs_size);
565                 goto bail4;
566         }
567
568         /* Load bitmap directory */
569         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
570                 goto bail4;
571         
572         /* Check for general fs errors*/
573         if (spareblock->dirty && !spareblock->old_wrote) {
574                 if (errs == 2) {
575                         printk("HPFS: Improperly stopped, not mounted\n");
576                         goto bail4;
577                 }
578                 hpfs_error(s, "improperly stopped");
579         }
580
581         if (!(s->s_flags & MS_RDONLY)) {
582                 spareblock->dirty = 1;
583                 spareblock->old_wrote = 0;
584                 mark_buffer_dirty(bh2);
585         }
586
587         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
588                 if (errs >= 2) {
589                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
590                         mark_dirty(s, 0);
591                         goto bail4;
592                 }
593                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
594                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
595                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
596         }
597         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
598                 if (errs >= 2) {
599                         printk("HPFS: Spare dnodes used, try chkdsk\n");
600                         mark_dirty(s, 0);
601                         goto bail4;
602                 }
603                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
604                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
605         }
606         if (chk) {
607                 unsigned a;
608                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
609                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
610                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
611                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
612                         goto bail4;
613                 }
614                 a = sbi->sb_dirband_size;
615                 sbi->sb_dirband_size = 0;
616                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
617                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
618                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
619                         mark_dirty(s, 0);
620                         goto bail4;
621                 }
622                 sbi->sb_dirband_size = a;
623         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
624
625         /* Load code page table */
626         if (le32_to_cpu(spareblock->n_code_pages))
627                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
628                         printk("HPFS: Warning: code page support is disabled\n");
629
630         brelse(bh2);
631         brelse(bh1);
632         brelse(bh0);
633
634         root = iget_locked(s, sbi->sb_root);
635         if (!root)
636                 goto bail0;
637         hpfs_init_inode(root);
638         hpfs_read_inode(root);
639         unlock_new_inode(root);
640         s->s_root = d_make_root(root);
641         if (!s->s_root)
642                 goto bail0;
643
644         /*
645          * find the root directory's . pointer & finish filling in the inode
646          */
647
648         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
649         if (root_dno)
650                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
651         if (!de)
652                 hpfs_error(s, "unable to find root dir");
653         else {
654                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
655                 root->i_atime.tv_nsec = 0;
656                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
657                 root->i_mtime.tv_nsec = 0;
658                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
659                 root->i_ctime.tv_nsec = 0;
660                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
661                 hpfs_i(root)->i_parent_dir = root->i_ino;
662                 if (root->i_size == -1)
663                         root->i_size = 2048;
664                 if (root->i_blocks == -1)
665                         root->i_blocks = 5;
666                 hpfs_brelse4(&qbh);
667         }
668         hpfs_unlock(s);
669         return 0;
670
671 bail4:  brelse(bh2);
672 bail3:  brelse(bh1);
673 bail2:  brelse(bh0);
674 bail1:
675 bail0:
676         hpfs_unlock(s);
677         kfree(sbi->sb_bmp_dir);
678         kfree(sbi->sb_cp_table);
679         s->s_fs_info = NULL;
680         kfree(sbi);
681         return -EINVAL;
682 }
683
684 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
685         int flags, const char *dev_name, void *data)
686 {
687         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
688 }
689
690 static struct file_system_type hpfs_fs_type = {
691         .owner          = THIS_MODULE,
692         .name           = "hpfs",
693         .mount          = hpfs_mount,
694         .kill_sb        = kill_block_super,
695         .fs_flags       = FS_REQUIRES_DEV,
696 };
697 MODULE_ALIAS_FS("hpfs");
698
699 static int __init init_hpfs_fs(void)
700 {
701         int err = init_inodecache();
702         if (err)
703                 goto out1;
704         err = register_filesystem(&hpfs_fs_type);
705         if (err)
706                 goto out;
707         return 0;
708 out:
709         destroy_inodecache();
710 out1:
711         return err;
712 }
713
714 static void __exit exit_hpfs_fs(void)
715 {
716         unregister_filesystem(&hpfs_fs_type);
717         destroy_inodecache();
718 }
719
720 module_init(init_hpfs_fs)
721 module_exit(exit_hpfs_fs)
722 MODULE_LICENSE("GPL");