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