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Push lock_super() into the ->remount_fs() of filesystems that care about it
[mv-sheeva.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
17 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
18
19 static void mark_dirty(struct super_block *s)
20 {
21         if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
22                 struct buffer_head *bh;
23                 struct hpfs_spare_block *sb;
24                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
25                         sb->dirty = 1;
26                         sb->old_wrote = 0;
27                         mark_buffer_dirty(bh);
28                         brelse(bh);
29                 }
30         }
31 }
32
33 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
34    were errors) */
35
36 static void unmark_dirty(struct super_block *s)
37 {
38         struct buffer_head *bh;
39         struct hpfs_spare_block *sb;
40         if (s->s_flags & MS_RDONLY) return;
41         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
42                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
43                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
44                 mark_buffer_dirty(bh);
45                 brelse(bh);
46         }
47 }
48
49 /* Filesystem error... */
50 static char err_buf[1024];
51
52 void hpfs_error(struct super_block *s, const char *fmt, ...)
53 {
54         va_list args;
55
56         va_start(args, fmt);
57         vsnprintf(err_buf, sizeof(err_buf), fmt, args);
58         va_end(args);
59
60         printk("HPFS: filesystem error: %s", err_buf);
61         if (!hpfs_sb(s)->sb_was_error) {
62                 if (hpfs_sb(s)->sb_err == 2) {
63                         printk("; crashing the system because you wanted it\n");
64                         mark_dirty(s);
65                         panic("HPFS panic");
66                 } else if (hpfs_sb(s)->sb_err == 1) {
67                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
68                         else {
69                                 printk("; remounting read-only\n");
70                                 mark_dirty(s);
71                                 s->s_flags |= MS_RDONLY;
72                         }
73                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
74                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
75         } else printk("\n");
76         hpfs_sb(s)->sb_was_error = 1;
77 }
78
79 /* 
80  * A little trick to detect cycles in many hpfs structures and don't let the
81  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
82  *
83  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
84  * nested each in other, chkdsk locked up happilly.
85  */
86
87 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
88                 char *msg)
89 {
90         if (*c2 && *c1 == key) {
91                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
92                 return 1;
93         }
94         (*c2)++;
95         if (!((*c2 - 1) & *c2)) *c1 = key;
96         return 0;
97 }
98
99 static void hpfs_put_super(struct super_block *s)
100 {
101         struct hpfs_sb_info *sbi = hpfs_sb(s);
102
103         lock_kernel();
104
105         kfree(sbi->sb_cp_table);
106         kfree(sbi->sb_bmp_dir);
107         unmark_dirty(s);
108         s->s_fs_info = NULL;
109         kfree(sbi);
110
111         unlock_kernel();
112 }
113
114 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
115 {
116         struct quad_buffer_head qbh;
117         unsigned *bits;
118         unsigned i, count;
119         if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
120         count = 0;
121         for (i = 0; i < 2048 / sizeof(unsigned); i++) {
122                 unsigned b; 
123                 if (!bits[i]) continue;
124                 for (b = bits[i]; b; b>>=1) count += b & 1;
125         }
126         hpfs_brelse4(&qbh);
127         return count;
128 }
129
130 static unsigned count_bitmaps(struct super_block *s)
131 {
132         unsigned n, count, n_bands;
133         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
134         count = 0;
135         for (n = 0; n < n_bands; n++)
136                 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
137         return count;
138 }
139
140 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
141 {
142         struct super_block *s = dentry->d_sb;
143         struct hpfs_sb_info *sbi = hpfs_sb(s);
144         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
145         lock_kernel();
146
147         /*if (sbi->sb_n_free == -1) {*/
148                 sbi->sb_n_free = count_bitmaps(s);
149                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
150         /*}*/
151         buf->f_type = s->s_magic;
152         buf->f_bsize = 512;
153         buf->f_blocks = sbi->sb_fs_size;
154         buf->f_bfree = sbi->sb_n_free;
155         buf->f_bavail = sbi->sb_n_free;
156         buf->f_files = sbi->sb_dirband_size / 4;
157         buf->f_ffree = sbi->sb_n_free_dnodes;
158         buf->f_fsid.val[0] = (u32)id;
159         buf->f_fsid.val[1] = (u32)(id >> 32);
160         buf->f_namelen = 254;
161
162         unlock_kernel();
163
164         return 0;
165 }
166
167 static struct kmem_cache * hpfs_inode_cachep;
168
169 static struct inode *hpfs_alloc_inode(struct super_block *sb)
170 {
171         struct hpfs_inode_info *ei;
172         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
173         if (!ei)
174                 return NULL;
175         ei->vfs_inode.i_version = 1;
176         return &ei->vfs_inode;
177 }
178
179 static void hpfs_destroy_inode(struct inode *inode)
180 {
181         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
182 }
183
184 static void init_once(void *foo)
185 {
186         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
187
188         mutex_init(&ei->i_mutex);
189         mutex_init(&ei->i_parent_mutex);
190         inode_init_once(&ei->vfs_inode);
191 }
192
193 static int init_inodecache(void)
194 {
195         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
196                                              sizeof(struct hpfs_inode_info),
197                                              0, (SLAB_RECLAIM_ACCOUNT|
198                                                 SLAB_MEM_SPREAD),
199                                              init_once);
200         if (hpfs_inode_cachep == NULL)
201                 return -ENOMEM;
202         return 0;
203 }
204
205 static void destroy_inodecache(void)
206 {
207         kmem_cache_destroy(hpfs_inode_cachep);
208 }
209
210 /*
211  * A tiny parser for option strings, stolen from dosfs.
212  * Stolen again from read-only hpfs.
213  * And updated for table-driven option parsing.
214  */
215
216 enum {
217         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
218         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
219         Opt_check_none, Opt_check_normal, Opt_check_strict,
220         Opt_err_cont, Opt_err_ro, Opt_err_panic,
221         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
222         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
223         Opt_timeshift, Opt_err,
224 };
225
226 static const match_table_t tokens = {
227         {Opt_help, "help"},
228         {Opt_uid, "uid=%u"},
229         {Opt_gid, "gid=%u"},
230         {Opt_umask, "umask=%o"},
231         {Opt_case_lower, "case=lower"},
232         {Opt_case_asis, "case=asis"},
233         {Opt_conv_binary, "conv=binary"},
234         {Opt_conv_text, "conv=text"},
235         {Opt_conv_auto, "conv=auto"},
236         {Opt_check_none, "check=none"},
237         {Opt_check_normal, "check=normal"},
238         {Opt_check_strict, "check=strict"},
239         {Opt_err_cont, "errors=continue"},
240         {Opt_err_ro, "errors=remount-ro"},
241         {Opt_err_panic, "errors=panic"},
242         {Opt_eas_no, "eas=no"},
243         {Opt_eas_ro, "eas=ro"},
244         {Opt_eas_rw, "eas=rw"},
245         {Opt_chkdsk_no, "chkdsk=no"},
246         {Opt_chkdsk_errors, "chkdsk=errors"},
247         {Opt_chkdsk_always, "chkdsk=always"},
248         {Opt_timeshift, "timeshift=%d"},
249         {Opt_err, NULL},
250 };
251
252 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
253                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
254                       int *chkdsk, int *timeshift)
255 {
256         char *p;
257         int option;
258
259         if (!opts)
260                 return 1;
261
262         /*printk("Parsing opts: '%s'\n",opts);*/
263
264         while ((p = strsep(&opts, ",")) != NULL) {
265                 substring_t args[MAX_OPT_ARGS];
266                 int token;
267                 if (!*p)
268                         continue;
269
270                 token = match_token(p, tokens, args);
271                 switch (token) {
272                 case Opt_help:
273                         return 2;
274                 case Opt_uid:
275                         if (match_int(args, &option))
276                                 return 0;
277                         *uid = option;
278                         break;
279                 case Opt_gid:
280                         if (match_int(args, &option))
281                                 return 0;
282                         *gid = option;
283                         break;
284                 case Opt_umask:
285                         if (match_octal(args, &option))
286                                 return 0;
287                         *umask = option;
288                         break;
289                 case Opt_case_lower:
290                         *lowercase = 1;
291                         break;
292                 case Opt_case_asis:
293                         *lowercase = 0;
294                         break;
295                 case Opt_conv_binary:
296                         *conv = CONV_BINARY;
297                         break;
298                 case Opt_conv_text:
299                         *conv = CONV_TEXT;
300                         break;
301                 case Opt_conv_auto:
302                         *conv = CONV_AUTO;
303                         break;
304                 case Opt_check_none:
305                         *chk = 0;
306                         break;
307                 case Opt_check_normal:
308                         *chk = 1;
309                         break;
310                 case Opt_check_strict:
311                         *chk = 2;
312                         break;
313                 case Opt_err_cont:
314                         *errs = 0;
315                         break;
316                 case Opt_err_ro:
317                         *errs = 1;
318                         break;
319                 case Opt_err_panic:
320                         *errs = 2;
321                         break;
322                 case Opt_eas_no:
323                         *eas = 0;
324                         break;
325                 case Opt_eas_ro:
326                         *eas = 1;
327                         break;
328                 case Opt_eas_rw:
329                         *eas = 2;
330                         break;
331                 case Opt_chkdsk_no:
332                         *chkdsk = 0;
333                         break;
334                 case Opt_chkdsk_errors:
335                         *chkdsk = 1;
336                         break;
337                 case Opt_chkdsk_always:
338                         *chkdsk = 2;
339                         break;
340                 case Opt_timeshift:
341                 {
342                         int m = 1;
343                         char *rhs = args[0].from;
344                         if (!rhs || !*rhs)
345                                 return 0;
346                         if (*rhs == '-') m = -1;
347                         if (*rhs == '+' || *rhs == '-') rhs++;
348                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
349                         if (*rhs)
350                                 return 0;
351                         break;
352                 }
353                 default:
354                         return 0;
355                 }
356         }
357         return 1;
358 }
359
360 static inline void hpfs_help(void)
361 {
362         printk("\n\
363 HPFS filesystem options:\n\
364       help              do not mount and display this text\n\
365       uid=xxx           set uid of files that don't have uid specified in eas\n\
366       gid=xxx           set gid of files that don't have gid specified in eas\n\
367       umask=xxx         set mode of files that don't have mode specified in eas\n\
368       case=lower        lowercase all files\n\
369       case=asis         do not lowercase files (default)\n\
370       conv=binary       do not convert CR/LF -> LF (default)\n\
371       conv=auto         convert only files with known text extensions\n\
372       conv=text         convert all files\n\
373       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
374       check=normal      do some checks - it should not crash (default)\n\
375       check=strict      do extra time-consuming checks, used for debugging\n\
376       errors=continue   continue on errors\n\
377       errors=remount-ro remount read-only if errors found (default)\n\
378       errors=panic      panic on errors\n\
379       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
380       chkdsk=errors     mark fs dirty if errors found (default)\n\
381       chkdsk=always     always mark fs dirty - used for debugging\n\
382       eas=no            ignore extended attributes\n\
383       eas=ro            read but do not write extended attributes\n\
384       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
385       timeshift=nnn     add nnn seconds to file times\n\
386 \n");
387 }
388
389 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
390 {
391         uid_t uid;
392         gid_t gid;
393         umode_t umask;
394         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
395         int o;
396         struct hpfs_sb_info *sbi = hpfs_sb(s);
397         char *new_opts = kstrdup(data, GFP_KERNEL);
398         
399         *flags |= MS_NOATIME;
400         
401         lock_super(s);
402         uid = sbi->sb_uid; gid = sbi->sb_gid;
403         umask = 0777 & ~sbi->sb_mode;
404         lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
405         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
406         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
407
408         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
409             &eas, &chk, &errs, &chkdsk, &timeshift))) {
410                 printk("HPFS: bad mount options.\n");
411                 goto out_err;
412         }
413         if (o == 2) {
414                 hpfs_help();
415                 goto out_err;
416         }
417         if (timeshift != sbi->sb_timeshift) {
418                 printk("HPFS: timeshift can't be changed using remount.\n");
419                 goto out_err;
420         }
421
422         unmark_dirty(s);
423
424         sbi->sb_uid = uid; sbi->sb_gid = gid;
425         sbi->sb_mode = 0777 & ~umask;
426         sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
427         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
428         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
429
430         if (!(*flags & MS_RDONLY)) mark_dirty(s);
431
432         replace_mount_options(s, new_opts);
433
434         unlock_super(s);
435         return 0;
436
437 out_err:
438         unlock_super(s);
439         kfree(new_opts);
440         return -EINVAL;
441 }
442
443 /* Super operations */
444
445 static const struct super_operations hpfs_sops =
446 {
447         .alloc_inode    = hpfs_alloc_inode,
448         .destroy_inode  = hpfs_destroy_inode,
449         .delete_inode   = hpfs_delete_inode,
450         .put_super      = hpfs_put_super,
451         .statfs         = hpfs_statfs,
452         .remount_fs     = hpfs_remount_fs,
453         .show_options   = generic_show_options,
454 };
455
456 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
457 {
458         struct buffer_head *bh0, *bh1, *bh2;
459         struct hpfs_boot_block *bootblock;
460         struct hpfs_super_block *superblock;
461         struct hpfs_spare_block *spareblock;
462         struct hpfs_sb_info *sbi;
463         struct inode *root;
464
465         uid_t uid;
466         gid_t gid;
467         umode_t umask;
468         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
469
470         dnode_secno root_dno;
471         struct hpfs_dirent *de = NULL;
472         struct quad_buffer_head qbh;
473
474         int o;
475
476         save_mount_options(s, options);
477
478         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
479         if (!sbi)
480                 return -ENOMEM;
481         s->s_fs_info = sbi;
482
483         sbi->sb_bmp_dir = NULL;
484         sbi->sb_cp_table = NULL;
485
486         init_MUTEX(&sbi->hpfs_creation_de);
487
488         uid = current_uid();
489         gid = current_gid();
490         umask = current_umask();
491         lowercase = 0;
492         conv = CONV_BINARY;
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, &conv,
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 (/*bootblock->magic != BB_MAGIC
518             ||*/ superblock->magic != SB_MAGIC
519             || 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
539         sbi->sb_root = superblock->root;
540         sbi->sb_fs_size = superblock->n_sectors;
541         sbi->sb_bitmaps = superblock->bitmaps;
542         sbi->sb_dirband_start = superblock->dir_band_start;
543         sbi->sb_dirband_size = superblock->n_dir_band;
544         sbi->sb_dmap = superblock->dir_band_bitmap;
545         sbi->sb_uid = uid;
546         sbi->sb_gid = gid;
547         sbi->sb_mode = 0777 & ~umask;
548         sbi->sb_n_free = -1;
549         sbi->sb_n_free_dnodes = -1;
550         sbi->sb_lowercase = lowercase;
551         sbi->sb_conv = conv;
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         /* Load bitmap directory */
563         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
564                 goto bail4;
565         
566         /* Check for general fs errors*/
567         if (spareblock->dirty && !spareblock->old_wrote) {
568                 if (errs == 2) {
569                         printk("HPFS: Improperly stopped, not mounted\n");
570                         goto bail4;
571                 }
572                 hpfs_error(s, "improperly stopped");
573         }
574
575         if (!(s->s_flags & MS_RDONLY)) {
576                 spareblock->dirty = 1;
577                 spareblock->old_wrote = 0;
578                 mark_buffer_dirty(bh2);
579         }
580
581         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
582                 if (errs >= 2) {
583                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
584                         mark_dirty(s);
585                         goto bail4;
586                 }
587                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
588                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
589                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
590         }
591         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
592                 if (errs >= 2) {
593                         printk("HPFS: Spare dnodes used, try chkdsk\n");
594                         mark_dirty(s);
595                         goto bail4;
596                 }
597                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
598                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
599         }
600         if (chk) {
601                 unsigned a;
602                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
603                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
604                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
605                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
606                         goto bail4;
607                 }
608                 a = sbi->sb_dirband_size;
609                 sbi->sb_dirband_size = 0;
610                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
611                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
612                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
613                         mark_dirty(s);
614                         goto bail4;
615                 }
616                 sbi->sb_dirband_size = a;
617         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
618
619         /* Load code page table */
620         if (spareblock->n_code_pages)
621                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
622                         printk("HPFS: Warning: code page support is disabled\n");
623
624         brelse(bh2);
625         brelse(bh1);
626         brelse(bh0);
627
628         root = iget_locked(s, sbi->sb_root);
629         if (!root)
630                 goto bail0;
631         hpfs_init_inode(root);
632         hpfs_read_inode(root);
633         unlock_new_inode(root);
634         s->s_root = d_alloc_root(root);
635         if (!s->s_root) {
636                 iput(root);
637                 goto bail0;
638         }
639         hpfs_set_dentry_operations(s->s_root);
640
641         /*
642          * find the root directory's . pointer & finish filling in the inode
643          */
644
645         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
646         if (root_dno)
647                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
648         if (!de)
649                 hpfs_error(s, "unable to find root dir");
650         else {
651                 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
652                 root->i_atime.tv_nsec = 0;
653                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
654                 root->i_mtime.tv_nsec = 0;
655                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
656                 root->i_ctime.tv_nsec = 0;
657                 hpfs_i(root)->i_ea_size = de->ea_size;
658                 hpfs_i(root)->i_parent_dir = root->i_ino;
659                 if (root->i_size == -1)
660                         root->i_size = 2048;
661                 if (root->i_blocks == -1)
662                         root->i_blocks = 5;
663                 hpfs_brelse4(&qbh);
664         }
665         return 0;
666
667 bail4:  brelse(bh2);
668 bail3:  brelse(bh1);
669 bail2:  brelse(bh0);
670 bail1:
671 bail0:
672         kfree(sbi->sb_bmp_dir);
673         kfree(sbi->sb_cp_table);
674         s->s_fs_info = NULL;
675         kfree(sbi);
676         return -EINVAL;
677 }
678
679 static int hpfs_get_sb(struct file_system_type *fs_type,
680         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
681 {
682         return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
683                            mnt);
684 }
685
686 static struct file_system_type hpfs_fs_type = {
687         .owner          = THIS_MODULE,
688         .name           = "hpfs",
689         .get_sb         = hpfs_get_sb,
690         .kill_sb        = kill_block_super,
691         .fs_flags       = FS_REQUIRES_DEV,
692 };
693
694 static int __init init_hpfs_fs(void)
695 {
696         int err = init_inodecache();
697         if (err)
698                 goto out1;
699         err = register_filesystem(&hpfs_fs_type);
700         if (err)
701                 goto out;
702         return 0;
703 out:
704         destroy_inodecache();
705 out1:
706         return err;
707 }
708
709 static void __exit exit_hpfs_fs(void)
710 {
711         unregister_filesystem(&hpfs_fs_type);
712         destroy_inodecache();
713 }
714
715 module_init(init_hpfs_fs)
716 module_exit(exit_hpfs_fs)
717 MODULE_LICENSE("GPL");