3690467c944e0869dd32dff84c7a13644e36b1dd
[linux-2.6.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         kmem_cache_destroy(hpfs_inode_cachep);
214 }
215
216 /*
217  * A tiny parser for option strings, stolen from dosfs.
218  * Stolen again from read-only hpfs.
219  * And updated for table-driven option parsing.
220  */
221
222 enum {
223         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
224         Opt_check_none, Opt_check_normal, Opt_check_strict,
225         Opt_err_cont, Opt_err_ro, Opt_err_panic,
226         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
227         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
228         Opt_timeshift, Opt_err,
229 };
230
231 static const match_table_t tokens = {
232         {Opt_help, "help"},
233         {Opt_uid, "uid=%u"},
234         {Opt_gid, "gid=%u"},
235         {Opt_umask, "umask=%o"},
236         {Opt_case_lower, "case=lower"},
237         {Opt_case_asis, "case=asis"},
238         {Opt_check_none, "check=none"},
239         {Opt_check_normal, "check=normal"},
240         {Opt_check_strict, "check=strict"},
241         {Opt_err_cont, "errors=continue"},
242         {Opt_err_ro, "errors=remount-ro"},
243         {Opt_err_panic, "errors=panic"},
244         {Opt_eas_no, "eas=no"},
245         {Opt_eas_ro, "eas=ro"},
246         {Opt_eas_rw, "eas=rw"},
247         {Opt_chkdsk_no, "chkdsk=no"},
248         {Opt_chkdsk_errors, "chkdsk=errors"},
249         {Opt_chkdsk_always, "chkdsk=always"},
250         {Opt_timeshift, "timeshift=%d"},
251         {Opt_err, NULL},
252 };
253
254 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
255                       int *lowercase, int *eas, int *chk, int *errs,
256                       int *chkdsk, int *timeshift)
257 {
258         char *p;
259         int option;
260
261         if (!opts)
262                 return 1;
263
264         /*printk("Parsing opts: '%s'\n",opts);*/
265
266         while ((p = strsep(&opts, ",")) != NULL) {
267                 substring_t args[MAX_OPT_ARGS];
268                 int token;
269                 if (!*p)
270                         continue;
271
272                 token = match_token(p, tokens, args);
273                 switch (token) {
274                 case Opt_help:
275                         return 2;
276                 case Opt_uid:
277                         if (match_int(args, &option))
278                                 return 0;
279                         *uid = option;
280                         break;
281                 case Opt_gid:
282                         if (match_int(args, &option))
283                                 return 0;
284                         *gid = option;
285                         break;
286                 case Opt_umask:
287                         if (match_octal(args, &option))
288                                 return 0;
289                         *umask = option;
290                         break;
291                 case Opt_case_lower:
292                         *lowercase = 1;
293                         break;
294                 case Opt_case_asis:
295                         *lowercase = 0;
296                         break;
297                 case Opt_check_none:
298                         *chk = 0;
299                         break;
300                 case Opt_check_normal:
301                         *chk = 1;
302                         break;
303                 case Opt_check_strict:
304                         *chk = 2;
305                         break;
306                 case Opt_err_cont:
307                         *errs = 0;
308                         break;
309                 case Opt_err_ro:
310                         *errs = 1;
311                         break;
312                 case Opt_err_panic:
313                         *errs = 2;
314                         break;
315                 case Opt_eas_no:
316                         *eas = 0;
317                         break;
318                 case Opt_eas_ro:
319                         *eas = 1;
320                         break;
321                 case Opt_eas_rw:
322                         *eas = 2;
323                         break;
324                 case Opt_chkdsk_no:
325                         *chkdsk = 0;
326                         break;
327                 case Opt_chkdsk_errors:
328                         *chkdsk = 1;
329                         break;
330                 case Opt_chkdsk_always:
331                         *chkdsk = 2;
332                         break;
333                 case Opt_timeshift:
334                 {
335                         int m = 1;
336                         char *rhs = args[0].from;
337                         if (!rhs || !*rhs)
338                                 return 0;
339                         if (*rhs == '-') m = -1;
340                         if (*rhs == '+' || *rhs == '-') rhs++;
341                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
342                         if (*rhs)
343                                 return 0;
344                         break;
345                 }
346                 default:
347                         return 0;
348                 }
349         }
350         return 1;
351 }
352
353 static inline void hpfs_help(void)
354 {
355         printk("\n\
356 HPFS filesystem options:\n\
357       help              do not mount and display this text\n\
358       uid=xxx           set uid of files that don't have uid specified in eas\n\
359       gid=xxx           set gid of files that don't have gid specified in eas\n\
360       umask=xxx         set mode of files that don't have mode specified in eas\n\
361       case=lower        lowercase all files\n\
362       case=asis         do not lowercase files (default)\n\
363       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
364       check=normal      do some checks - it should not crash (default)\n\
365       check=strict      do extra time-consuming checks, used for debugging\n\
366       errors=continue   continue on errors\n\
367       errors=remount-ro remount read-only if errors found (default)\n\
368       errors=panic      panic on errors\n\
369       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
370       chkdsk=errors     mark fs dirty if errors found (default)\n\
371       chkdsk=always     always mark fs dirty - used for debugging\n\
372       eas=no            ignore extended attributes\n\
373       eas=ro            read but do not write extended attributes\n\
374       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
375       timeshift=nnn     add nnn seconds to file times\n\
376 \n");
377 }
378
379 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
380 {
381         uid_t uid;
382         gid_t gid;
383         umode_t umask;
384         int lowercase, eas, chk, errs, chkdsk, timeshift;
385         int o;
386         struct hpfs_sb_info *sbi = hpfs_sb(s);
387         char *new_opts = kstrdup(data, GFP_KERNEL);
388         
389         *flags |= MS_NOATIME;
390         
391         hpfs_lock(s);
392         lock_super(s);
393         uid = sbi->sb_uid; gid = sbi->sb_gid;
394         umask = 0777 & ~sbi->sb_mode;
395         lowercase = sbi->sb_lowercase;
396         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
397         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
398
399         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
400             &eas, &chk, &errs, &chkdsk, &timeshift))) {
401                 printk("HPFS: bad mount options.\n");
402                 goto out_err;
403         }
404         if (o == 2) {
405                 hpfs_help();
406                 goto out_err;
407         }
408         if (timeshift != sbi->sb_timeshift) {
409                 printk("HPFS: timeshift can't be changed using remount.\n");
410                 goto out_err;
411         }
412
413         unmark_dirty(s);
414
415         sbi->sb_uid = uid; sbi->sb_gid = gid;
416         sbi->sb_mode = 0777 & ~umask;
417         sbi->sb_lowercase = lowercase;
418         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
419         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
420
421         if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
422
423         replace_mount_options(s, new_opts);
424
425         unlock_super(s);
426         hpfs_unlock(s);
427         return 0;
428
429 out_err:
430         unlock_super(s);
431         hpfs_unlock(s);
432         kfree(new_opts);
433         return -EINVAL;
434 }
435
436 /* Super operations */
437
438 static const struct super_operations hpfs_sops =
439 {
440         .alloc_inode    = hpfs_alloc_inode,
441         .destroy_inode  = hpfs_destroy_inode,
442         .evict_inode    = hpfs_evict_inode,
443         .put_super      = hpfs_put_super,
444         .statfs         = hpfs_statfs,
445         .remount_fs     = hpfs_remount_fs,
446         .show_options   = generic_show_options,
447 };
448
449 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
450 {
451         struct buffer_head *bh0, *bh1, *bh2;
452         struct hpfs_boot_block *bootblock;
453         struct hpfs_super_block *superblock;
454         struct hpfs_spare_block *spareblock;
455         struct hpfs_sb_info *sbi;
456         struct inode *root;
457
458         uid_t uid;
459         gid_t gid;
460         umode_t umask;
461         int lowercase, eas, chk, errs, chkdsk, timeshift;
462
463         dnode_secno root_dno;
464         struct hpfs_dirent *de = NULL;
465         struct quad_buffer_head qbh;
466
467         int o;
468
469         save_mount_options(s, options);
470
471         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
472         if (!sbi) {
473                 return -ENOMEM;
474         }
475         s->s_fs_info = sbi;
476
477         sbi->sb_bmp_dir = NULL;
478         sbi->sb_cp_table = NULL;
479
480         mutex_init(&sbi->hpfs_mutex);
481         hpfs_lock(s);
482
483         uid = current_uid();
484         gid = current_gid();
485         umask = current_umask();
486         lowercase = 0;
487         eas = 2;
488         chk = 1;
489         errs = 1;
490         chkdsk = 1;
491         timeshift = 0;
492
493         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
494             &eas, &chk, &errs, &chkdsk, &timeshift))) {
495                 printk("HPFS: bad mount options.\n");
496                 goto bail0;
497         }
498         if (o==2) {
499                 hpfs_help();
500                 goto bail0;
501         }
502
503         /*sbi->sb_mounting = 1;*/
504         sb_set_blocksize(s, 512);
505         sbi->sb_fs_size = -1;
506         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
507         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
508         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
509
510         /* Check magics */
511         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
512             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
513             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
514                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
515                 goto bail4;
516         }
517
518         /* Check version */
519         if (!(s->s_flags & MS_RDONLY) &&
520               superblock->funcversion != 2 && superblock->funcversion != 3) {
521                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
522                         (int)superblock->version, (int)superblock->funcversion);
523                 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");
524                 goto bail4;
525         }
526
527         s->s_flags |= MS_NOATIME;
528
529         /* Fill superblock stuff */
530         s->s_magic = HPFS_SUPER_MAGIC;
531         s->s_op = &hpfs_sops;
532         s->s_d_op = &hpfs_dentry_operations;
533
534         sbi->sb_root = le32_to_cpu(superblock->root);
535         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
536         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
537         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
538         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
539         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
540         sbi->sb_uid = uid;
541         sbi->sb_gid = gid;
542         sbi->sb_mode = 0777 & ~umask;
543         sbi->sb_n_free = -1;
544         sbi->sb_n_free_dnodes = -1;
545         sbi->sb_lowercase = lowercase;
546         sbi->sb_eas = eas;
547         sbi->sb_chk = chk;
548         sbi->sb_chkdsk = chkdsk;
549         sbi->sb_err = errs;
550         sbi->sb_timeshift = timeshift;
551         sbi->sb_was_error = 0;
552         sbi->sb_cp_table = NULL;
553         sbi->sb_c_bitmap = -1;
554         sbi->sb_max_fwd_alloc = 0xffffff;
555         
556         /* Load bitmap directory */
557         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
558                 goto bail4;
559         
560         /* Check for general fs errors*/
561         if (spareblock->dirty && !spareblock->old_wrote) {
562                 if (errs == 2) {
563                         printk("HPFS: Improperly stopped, not mounted\n");
564                         goto bail4;
565                 }
566                 hpfs_error(s, "improperly stopped");
567         }
568
569         if (!(s->s_flags & MS_RDONLY)) {
570                 spareblock->dirty = 1;
571                 spareblock->old_wrote = 0;
572                 mark_buffer_dirty(bh2);
573         }
574
575         if (le32_to_cpu(spareblock->hotfixes_used) || le32_to_cpu(spareblock->n_spares_used)) {
576                 if (errs >= 2) {
577                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
578                         mark_dirty(s, 0);
579                         goto bail4;
580                 }
581                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
582                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
583                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
584         }
585         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
586                 if (errs >= 2) {
587                         printk("HPFS: Spare dnodes used, try chkdsk\n");
588                         mark_dirty(s, 0);
589                         goto bail4;
590                 }
591                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
592                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
593         }
594         if (chk) {
595                 unsigned a;
596                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
597                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
598                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
599                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
600                         goto bail4;
601                 }
602                 a = sbi->sb_dirband_size;
603                 sbi->sb_dirband_size = 0;
604                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
605                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
606                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
607                         mark_dirty(s, 0);
608                         goto bail4;
609                 }
610                 sbi->sb_dirband_size = a;
611         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
612
613         /* Load code page table */
614         if (le32_to_cpu(spareblock->n_code_pages))
615                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
616                         printk("HPFS: Warning: code page support is disabled\n");
617
618         brelse(bh2);
619         brelse(bh1);
620         brelse(bh0);
621
622         root = iget_locked(s, sbi->sb_root);
623         if (!root)
624                 goto bail0;
625         hpfs_init_inode(root);
626         hpfs_read_inode(root);
627         unlock_new_inode(root);
628         s->s_root = d_alloc_root(root);
629         if (!s->s_root) {
630                 iput(root);
631                 goto bail0;
632         }
633
634         /*
635          * find the root directory's . pointer & finish filling in the inode
636          */
637
638         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
639         if (root_dno)
640                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
641         if (!de)
642                 hpfs_error(s, "unable to find root dir");
643         else {
644                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
645                 root->i_atime.tv_nsec = 0;
646                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
647                 root->i_mtime.tv_nsec = 0;
648                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
649                 root->i_ctime.tv_nsec = 0;
650                 hpfs_i(root)->i_ea_size = le16_to_cpu(de->ea_size);
651                 hpfs_i(root)->i_parent_dir = root->i_ino;
652                 if (root->i_size == -1)
653                         root->i_size = 2048;
654                 if (root->i_blocks == -1)
655                         root->i_blocks = 5;
656                 hpfs_brelse4(&qbh);
657         }
658         hpfs_unlock(s);
659         return 0;
660
661 bail4:  brelse(bh2);
662 bail3:  brelse(bh1);
663 bail2:  brelse(bh0);
664 bail1:
665 bail0:
666         hpfs_unlock(s);
667         kfree(sbi->sb_bmp_dir);
668         kfree(sbi->sb_cp_table);
669         s->s_fs_info = NULL;
670         kfree(sbi);
671         return -EINVAL;
672 }
673
674 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
675         int flags, const char *dev_name, void *data)
676 {
677         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
678 }
679
680 static struct file_system_type hpfs_fs_type = {
681         .owner          = THIS_MODULE,
682         .name           = "hpfs",
683         .mount          = hpfs_mount,
684         .kill_sb        = kill_block_super,
685         .fs_flags       = FS_REQUIRES_DEV,
686 };
687
688 static int __init init_hpfs_fs(void)
689 {
690         int err = init_inodecache();
691         if (err)
692                 goto out1;
693         err = register_filesystem(&hpfs_fs_type);
694         if (err)
695                 goto out;
696         return 0;
697 out:
698         destroy_inodecache();
699 out1:
700         return err;
701 }
702
703 static void __exit exit_hpfs_fs(void)
704 {
705         unregister_filesystem(&hpfs_fs_type);
706         destroy_inodecache();
707 }
708
709 module_init(init_hpfs_fs)
710 module_exit(exit_hpfs_fs)
711 MODULE_LICENSE("GPL");