Merge tag 'edac_fix_for_4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp
[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                         pr_cont("; 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)
76                                 pr_cont("; already mounted read-only\n");
77                         else {
78                                 pr_cont("; remounting read-only\n");
79                                 mark_dirty(s, 0);
80                                 s->s_flags |= MS_RDONLY;
81                         }
82                 } else if (s->s_flags & MS_RDONLY)
83                                 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
84                 else
85                         pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
86         } else
87                 pr_cont("\n");
88         hpfs_sb(s)->sb_was_error = 1;
89 }
90
91 /* 
92  * A little trick to detect cycles in many hpfs structures and don't let the
93  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
94  *
95  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
96  * nested each in other, chkdsk locked up happilly.
97  */
98
99 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
100                 char *msg)
101 {
102         if (*c2 && *c1 == key) {
103                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
104                 return 1;
105         }
106         (*c2)++;
107         if (!((*c2 - 1) & *c2)) *c1 = key;
108         return 0;
109 }
110
111 static void free_sbi(struct hpfs_sb_info *sbi)
112 {
113         kfree(sbi->sb_cp_table);
114         kfree(sbi->sb_bmp_dir);
115         kfree(sbi);
116 }
117
118 static void lazy_free_sbi(struct rcu_head *rcu)
119 {
120         free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
121 }
122
123 static void hpfs_put_super(struct super_block *s)
124 {
125         hpfs_lock(s);
126         unmark_dirty(s);
127         hpfs_unlock(s);
128         call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
129 }
130
131 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
132 {
133         struct quad_buffer_head qbh;
134         unsigned long *bits;
135         unsigned count;
136
137         bits = hpfs_map_4sectors(s, secno, &qbh, 0);
138         if (!bits)
139                 return (unsigned)-1;
140         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
141         hpfs_brelse4(&qbh);
142         return count;
143 }
144
145 static unsigned count_bitmaps(struct super_block *s)
146 {
147         unsigned n, count, n_bands;
148         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
149         count = 0;
150         for (n = 0; n < COUNT_RD_AHEAD; n++) {
151                 hpfs_prefetch_bitmap(s, n);
152         }
153         for (n = 0; n < n_bands; n++) {
154                 unsigned c;
155                 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
156                 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
157                 if (c != (unsigned)-1)
158                         count += c;
159         }
160         return count;
161 }
162
163 unsigned hpfs_get_free_dnodes(struct super_block *s)
164 {
165         struct hpfs_sb_info *sbi = hpfs_sb(s);
166         if (sbi->sb_n_free_dnodes == (unsigned)-1) {
167                 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
168                 if (c == (unsigned)-1)
169                         return 0;
170                 sbi->sb_n_free_dnodes = c;
171         }
172         return sbi->sb_n_free_dnodes;
173 }
174
175 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
176 {
177         struct super_block *s = dentry->d_sb;
178         struct hpfs_sb_info *sbi = hpfs_sb(s);
179         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
180
181         hpfs_lock(s);
182
183         if (sbi->sb_n_free == (unsigned)-1)
184                 sbi->sb_n_free = count_bitmaps(s);
185
186         buf->f_type = s->s_magic;
187         buf->f_bsize = 512;
188         buf->f_blocks = sbi->sb_fs_size;
189         buf->f_bfree = sbi->sb_n_free;
190         buf->f_bavail = sbi->sb_n_free;
191         buf->f_files = sbi->sb_dirband_size / 4;
192         buf->f_ffree = hpfs_get_free_dnodes(s);
193         buf->f_fsid.val[0] = (u32)id;
194         buf->f_fsid.val[1] = (u32)(id >> 32);
195         buf->f_namelen = 254;
196
197         hpfs_unlock(s);
198
199         return 0;
200 }
201
202
203 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
204 {
205         switch (cmd) {
206                 case FITRIM: {
207                         struct fstrim_range range;
208                         secno n_trimmed;
209                         int r;
210                         if (!capable(CAP_SYS_ADMIN))
211                                 return -EPERM;
212                         if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
213                                 return -EFAULT;
214                         r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
215                         if (r)
216                                 return r;
217                         range.len = (u64)n_trimmed << 9;
218                         if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
219                                 return -EFAULT;
220                         return 0;
221                 }
222                 default: {
223                         return -ENOIOCTLCMD;
224                 }
225         }
226 }
227
228
229 static struct kmem_cache * hpfs_inode_cachep;
230
231 static struct inode *hpfs_alloc_inode(struct super_block *sb)
232 {
233         struct hpfs_inode_info *ei;
234         ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
235         if (!ei)
236                 return NULL;
237         ei->vfs_inode.i_version = 1;
238         return &ei->vfs_inode;
239 }
240
241 static void hpfs_i_callback(struct rcu_head *head)
242 {
243         struct inode *inode = container_of(head, struct inode, i_rcu);
244         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
245 }
246
247 static void hpfs_destroy_inode(struct inode *inode)
248 {
249         call_rcu(&inode->i_rcu, hpfs_i_callback);
250 }
251
252 static void init_once(void *foo)
253 {
254         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
255
256         inode_init_once(&ei->vfs_inode);
257 }
258
259 static int init_inodecache(void)
260 {
261         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
262                                              sizeof(struct hpfs_inode_info),
263                                              0, (SLAB_RECLAIM_ACCOUNT|
264                                                 SLAB_MEM_SPREAD),
265                                              init_once);
266         if (hpfs_inode_cachep == NULL)
267                 return -ENOMEM;
268         return 0;
269 }
270
271 static void destroy_inodecache(void)
272 {
273         /*
274          * Make sure all delayed rcu free inodes are flushed before we
275          * destroy cache.
276          */
277         rcu_barrier();
278         kmem_cache_destroy(hpfs_inode_cachep);
279 }
280
281 /*
282  * A tiny parser for option strings, stolen from dosfs.
283  * Stolen again from read-only hpfs.
284  * And updated for table-driven option parsing.
285  */
286
287 enum {
288         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
289         Opt_check_none, Opt_check_normal, Opt_check_strict,
290         Opt_err_cont, Opt_err_ro, Opt_err_panic,
291         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
292         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
293         Opt_timeshift, Opt_err,
294 };
295
296 static const match_table_t tokens = {
297         {Opt_help, "help"},
298         {Opt_uid, "uid=%u"},
299         {Opt_gid, "gid=%u"},
300         {Opt_umask, "umask=%o"},
301         {Opt_case_lower, "case=lower"},
302         {Opt_case_asis, "case=asis"},
303         {Opt_check_none, "check=none"},
304         {Opt_check_normal, "check=normal"},
305         {Opt_check_strict, "check=strict"},
306         {Opt_err_cont, "errors=continue"},
307         {Opt_err_ro, "errors=remount-ro"},
308         {Opt_err_panic, "errors=panic"},
309         {Opt_eas_no, "eas=no"},
310         {Opt_eas_ro, "eas=ro"},
311         {Opt_eas_rw, "eas=rw"},
312         {Opt_chkdsk_no, "chkdsk=no"},
313         {Opt_chkdsk_errors, "chkdsk=errors"},
314         {Opt_chkdsk_always, "chkdsk=always"},
315         {Opt_timeshift, "timeshift=%d"},
316         {Opt_err, NULL},
317 };
318
319 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
320                       int *lowercase, int *eas, int *chk, int *errs,
321                       int *chkdsk, int *timeshift)
322 {
323         char *p;
324         int option;
325
326         if (!opts)
327                 return 1;
328
329         /*pr_info("Parsing opts: '%s'\n",opts);*/
330
331         while ((p = strsep(&opts, ",")) != NULL) {
332                 substring_t args[MAX_OPT_ARGS];
333                 int token;
334                 if (!*p)
335                         continue;
336
337                 token = match_token(p, tokens, args);
338                 switch (token) {
339                 case Opt_help:
340                         return 2;
341                 case Opt_uid:
342                         if (match_int(args, &option))
343                                 return 0;
344                         *uid = make_kuid(current_user_ns(), option);
345                         if (!uid_valid(*uid))
346                                 return 0;
347                         break;
348                 case Opt_gid:
349                         if (match_int(args, &option))
350                                 return 0;
351                         *gid = make_kgid(current_user_ns(), option);
352                         if (!gid_valid(*gid))
353                                 return 0;
354                         break;
355                 case Opt_umask:
356                         if (match_octal(args, &option))
357                                 return 0;
358                         *umask = option;
359                         break;
360                 case Opt_case_lower:
361                         *lowercase = 1;
362                         break;
363                 case Opt_case_asis:
364                         *lowercase = 0;
365                         break;
366                 case Opt_check_none:
367                         *chk = 0;
368                         break;
369                 case Opt_check_normal:
370                         *chk = 1;
371                         break;
372                 case Opt_check_strict:
373                         *chk = 2;
374                         break;
375                 case Opt_err_cont:
376                         *errs = 0;
377                         break;
378                 case Opt_err_ro:
379                         *errs = 1;
380                         break;
381                 case Opt_err_panic:
382                         *errs = 2;
383                         break;
384                 case Opt_eas_no:
385                         *eas = 0;
386                         break;
387                 case Opt_eas_ro:
388                         *eas = 1;
389                         break;
390                 case Opt_eas_rw:
391                         *eas = 2;
392                         break;
393                 case Opt_chkdsk_no:
394                         *chkdsk = 0;
395                         break;
396                 case Opt_chkdsk_errors:
397                         *chkdsk = 1;
398                         break;
399                 case Opt_chkdsk_always:
400                         *chkdsk = 2;
401                         break;
402                 case Opt_timeshift:
403                 {
404                         int m = 1;
405                         char *rhs = args[0].from;
406                         if (!rhs || !*rhs)
407                                 return 0;
408                         if (*rhs == '-') m = -1;
409                         if (*rhs == '+' || *rhs == '-') rhs++;
410                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
411                         if (*rhs)
412                                 return 0;
413                         break;
414                 }
415                 default:
416                         return 0;
417                 }
418         }
419         return 1;
420 }
421
422 static inline void hpfs_help(void)
423 {
424         pr_info("\n\
425 HPFS filesystem options:\n\
426       help              do not mount and display this text\n\
427       uid=xxx           set uid of files that don't have uid specified in eas\n\
428       gid=xxx           set gid of files that don't have gid specified in eas\n\
429       umask=xxx         set mode of files that don't have mode specified in eas\n\
430       case=lower        lowercase all files\n\
431       case=asis         do not lowercase files (default)\n\
432       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
433       check=normal      do some checks - it should not crash (default)\n\
434       check=strict      do extra time-consuming checks, used for debugging\n\
435       errors=continue   continue on errors\n\
436       errors=remount-ro remount read-only if errors found (default)\n\
437       errors=panic      panic on errors\n\
438       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
439       chkdsk=errors     mark fs dirty if errors found (default)\n\
440       chkdsk=always     always mark fs dirty - used for debugging\n\
441       eas=no            ignore extended attributes\n\
442       eas=ro            read but do not write extended attributes\n\
443       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
444       timeshift=nnn     add nnn seconds to file times\n\
445 \n");
446 }
447
448 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
449 {
450         kuid_t uid;
451         kgid_t gid;
452         umode_t umask;
453         int lowercase, eas, chk, errs, chkdsk, timeshift;
454         int o;
455         struct hpfs_sb_info *sbi = hpfs_sb(s);
456         char *new_opts = kstrdup(data, GFP_KERNEL);
457
458         if (!new_opts)
459                 return -ENOMEM;
460
461         sync_filesystem(s);
462
463         *flags |= MS_NOATIME;
464
465         hpfs_lock(s);
466         uid = sbi->sb_uid; gid = sbi->sb_gid;
467         umask = 0777 & ~sbi->sb_mode;
468         lowercase = sbi->sb_lowercase;
469         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
470         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
471
472         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
473             &eas, &chk, &errs, &chkdsk, &timeshift))) {
474                 pr_err("bad mount options.\n");
475                 goto out_err;
476         }
477         if (o == 2) {
478                 hpfs_help();
479                 goto out_err;
480         }
481         if (timeshift != sbi->sb_timeshift) {
482                 pr_err("timeshift can't be changed using remount.\n");
483                 goto out_err;
484         }
485
486         unmark_dirty(s);
487
488         sbi->sb_uid = uid; sbi->sb_gid = gid;
489         sbi->sb_mode = 0777 & ~umask;
490         sbi->sb_lowercase = lowercase;
491         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
492         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
493
494         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
495
496         replace_mount_options(s, new_opts);
497
498         hpfs_unlock(s);
499         return 0;
500
501 out_err:
502         hpfs_unlock(s);
503         kfree(new_opts);
504         return -EINVAL;
505 }
506
507 /* Super operations */
508
509 static const struct super_operations hpfs_sops =
510 {
511         .alloc_inode    = hpfs_alloc_inode,
512         .destroy_inode  = hpfs_destroy_inode,
513         .evict_inode    = hpfs_evict_inode,
514         .put_super      = hpfs_put_super,
515         .statfs         = hpfs_statfs,
516         .remount_fs     = hpfs_remount_fs,
517         .show_options   = generic_show_options,
518 };
519
520 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
521 {
522         struct buffer_head *bh0, *bh1, *bh2;
523         struct hpfs_boot_block *bootblock;
524         struct hpfs_super_block *superblock;
525         struct hpfs_spare_block *spareblock;
526         struct hpfs_sb_info *sbi;
527         struct inode *root;
528
529         kuid_t uid;
530         kgid_t gid;
531         umode_t umask;
532         int lowercase, eas, chk, errs, chkdsk, timeshift;
533
534         dnode_secno root_dno;
535         struct hpfs_dirent *de = NULL;
536         struct quad_buffer_head qbh;
537
538         int o;
539
540         save_mount_options(s, options);
541
542         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
543         if (!sbi) {
544                 return -ENOMEM;
545         }
546         s->s_fs_info = sbi;
547
548         mutex_init(&sbi->hpfs_mutex);
549         hpfs_lock(s);
550
551         uid = current_uid();
552         gid = current_gid();
553         umask = current_umask();
554         lowercase = 0;
555         eas = 2;
556         chk = 1;
557         errs = 1;
558         chkdsk = 1;
559         timeshift = 0;
560
561         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
562             &eas, &chk, &errs, &chkdsk, &timeshift))) {
563                 pr_err("bad mount options.\n");
564                 goto bail0;
565         }
566         if (o==2) {
567                 hpfs_help();
568                 goto bail0;
569         }
570
571         /*sbi->sb_mounting = 1;*/
572         sb_set_blocksize(s, 512);
573         sbi->sb_fs_size = -1;
574         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
575         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
576         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
577
578         /* Check magics */
579         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
580             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
581             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
582                 if (!silent)
583                         pr_err("Bad magic ... probably not HPFS\n");
584                 goto bail4;
585         }
586
587         /* Check version */
588         if (!(s->s_flags & MS_RDONLY) &&
589               superblock->funcversion != 2 && superblock->funcversion != 3) {
590                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
591                         (int)superblock->version, (int)superblock->funcversion);
592                 pr_err("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");
593                 goto bail4;
594         }
595
596         s->s_flags |= MS_NOATIME;
597
598         /* Fill superblock stuff */
599         s->s_magic = HPFS_SUPER_MAGIC;
600         s->s_op = &hpfs_sops;
601         s->s_d_op = &hpfs_dentry_operations;
602
603         sbi->sb_root = le32_to_cpu(superblock->root);
604         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
605         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
606         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
607         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
608         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
609         sbi->sb_uid = uid;
610         sbi->sb_gid = gid;
611         sbi->sb_mode = 0777 & ~umask;
612         sbi->sb_n_free = -1;
613         sbi->sb_n_free_dnodes = -1;
614         sbi->sb_lowercase = lowercase;
615         sbi->sb_eas = eas;
616         sbi->sb_chk = chk;
617         sbi->sb_chkdsk = chkdsk;
618         sbi->sb_err = errs;
619         sbi->sb_timeshift = timeshift;
620         sbi->sb_was_error = 0;
621         sbi->sb_cp_table = NULL;
622         sbi->sb_c_bitmap = -1;
623         sbi->sb_max_fwd_alloc = 0xffffff;
624
625         if (sbi->sb_fs_size >= 0x80000000) {
626                 hpfs_error(s, "invalid size in superblock: %08x",
627                         (unsigned)sbi->sb_fs_size);
628                 goto bail4;
629         }
630
631         /* Load bitmap directory */
632         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
633                 goto bail4;
634         
635         /* Check for general fs errors*/
636         if (spareblock->dirty && !spareblock->old_wrote) {
637                 if (errs == 2) {
638                         pr_err("Improperly stopped, not mounted\n");
639                         goto bail4;
640                 }
641                 hpfs_error(s, "improperly stopped");
642         }
643
644         if (!(s->s_flags & MS_RDONLY)) {
645                 spareblock->dirty = 1;
646                 spareblock->old_wrote = 0;
647                 mark_buffer_dirty(bh2);
648         }
649
650         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
651                 if (errs >= 2) {
652                         pr_err("Hotfixes not supported here, try chkdsk\n");
653                         mark_dirty(s, 0);
654                         goto bail4;
655                 }
656                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
657                 if (errs == 0)
658                         pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n");
659                 else
660                         pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n");
661         }
662         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
663                 if (errs >= 2) {
664                         pr_err("Spare dnodes used, try chkdsk\n");
665                         mark_dirty(s, 0);
666                         goto bail4;
667                 }
668                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
669                 if (errs == 0)
670                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
671         }
672         if (chk) {
673                 unsigned a;
674                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
675                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
676                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
677                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
678                         goto bail4;
679                 }
680                 a = sbi->sb_dirband_size;
681                 sbi->sb_dirband_size = 0;
682                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
683                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
684                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
685                         mark_dirty(s, 0);
686                         goto bail4;
687                 }
688                 sbi->sb_dirband_size = a;
689         } else
690                 pr_err("You really don't want any checks? You are crazy...\n");
691
692         /* Load code page table */
693         if (le32_to_cpu(spareblock->n_code_pages))
694                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
695                         pr_err("code page support is disabled\n");
696
697         brelse(bh2);
698         brelse(bh1);
699         brelse(bh0);
700
701         root = iget_locked(s, sbi->sb_root);
702         if (!root)
703                 goto bail0;
704         hpfs_init_inode(root);
705         hpfs_read_inode(root);
706         unlock_new_inode(root);
707         s->s_root = d_make_root(root);
708         if (!s->s_root)
709                 goto bail0;
710
711         /*
712          * find the root directory's . pointer & finish filling in the inode
713          */
714
715         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
716         if (root_dno)
717                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
718         if (!de)
719                 hpfs_error(s, "unable to find root dir");
720         else {
721                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
722                 root->i_atime.tv_nsec = 0;
723                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
724                 root->i_mtime.tv_nsec = 0;
725                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
726                 root->i_ctime.tv_nsec = 0;
727                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
728                 hpfs_i(root)->i_parent_dir = root->i_ino;
729                 if (root->i_size == -1)
730                         root->i_size = 2048;
731                 if (root->i_blocks == -1)
732                         root->i_blocks = 5;
733                 hpfs_brelse4(&qbh);
734         }
735         hpfs_unlock(s);
736         return 0;
737
738 bail4:  brelse(bh2);
739 bail3:  brelse(bh1);
740 bail2:  brelse(bh0);
741 bail1:
742 bail0:
743         hpfs_unlock(s);
744         free_sbi(sbi);
745         return -EINVAL;
746 }
747
748 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
749         int flags, const char *dev_name, void *data)
750 {
751         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
752 }
753
754 static struct file_system_type hpfs_fs_type = {
755         .owner          = THIS_MODULE,
756         .name           = "hpfs",
757         .mount          = hpfs_mount,
758         .kill_sb        = kill_block_super,
759         .fs_flags       = FS_REQUIRES_DEV,
760 };
761 MODULE_ALIAS_FS("hpfs");
762
763 static int __init init_hpfs_fs(void)
764 {
765         int err = init_inodecache();
766         if (err)
767                 goto out1;
768         err = register_filesystem(&hpfs_fs_type);
769         if (err)
770                 goto out;
771         return 0;
772 out:
773         destroy_inodecache();
774 out1:
775         return err;
776 }
777
778 static void __exit exit_hpfs_fs(void)
779 {
780         unregister_filesystem(&hpfs_fs_type);
781         destroy_inodecache();
782 }
783
784 module_init(init_hpfs_fs)
785 module_exit(exit_hpfs_fs)
786 MODULE_LICENSE("GPL");