[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
[safe/jmp/linux-2.6] / 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
15 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
16
17 static void mark_dirty(struct super_block *s)
18 {
19         if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
20                 struct buffer_head *bh;
21                 struct hpfs_spare_block *sb;
22                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
23                         sb->dirty = 1;
24                         sb->old_wrote = 0;
25                         mark_buffer_dirty(bh);
26                         brelse(bh);
27                 }
28         }
29 }
30
31 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
32    were errors) */
33
34 static void unmark_dirty(struct super_block *s)
35 {
36         struct buffer_head *bh;
37         struct hpfs_spare_block *sb;
38         if (s->s_flags & MS_RDONLY) return;
39         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
40                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
41                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
42                 mark_buffer_dirty(bh);
43                 brelse(bh);
44         }
45 }
46
47 /* Filesystem error... */
48
49 #define ERR_BUF_SIZE 1024
50
51 void hpfs_error(struct super_block *s, char *m,...)
52 {
53         char *buf;
54         va_list l;
55         va_start(l, m);
56         if (!(buf = kmalloc(ERR_BUF_SIZE, GFP_KERNEL)))
57                 printk("HPFS: No memory for error message '%s'\n",m);
58         else if (vsprintf(buf, m, l) >= ERR_BUF_SIZE)
59                 printk("HPFS: Grrrr... Kernel memory corrupted ... going on, but it'll crash very soon :-(\n");
60         printk("HPFS: filesystem error: ");
61         if (buf) printk("%s", buf);
62         else printk("%s\n",m);
63         if (!hpfs_sb(s)->sb_was_error) {
64                 if (hpfs_sb(s)->sb_err == 2) {
65                         printk("; crashing the system because you wanted it\n");
66                         mark_dirty(s);
67                         panic("HPFS panic");
68                 } else if (hpfs_sb(s)->sb_err == 1) {
69                         if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
70                         else {
71                                 printk("; remounting read-only\n");
72                                 mark_dirty(s);
73                                 s->s_flags |= MS_RDONLY;
74                         }
75                 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
76                 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
77         } else printk("\n");
78         kfree(buf);
79         hpfs_sb(s)->sb_was_error = 1;
80 }
81
82 /* 
83  * A little trick to detect cycles in many hpfs structures and don't let the
84  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
85  *
86  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
87  * nested each in other, chkdsk locked up happilly.
88  */
89
90 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
91                 char *msg)
92 {
93         if (*c2 && *c1 == key) {
94                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
95                 return 1;
96         }
97         (*c2)++;
98         if (!((*c2 - 1) & *c2)) *c1 = key;
99         return 0;
100 }
101
102 static void hpfs_put_super(struct super_block *s)
103 {
104         struct hpfs_sb_info *sbi = hpfs_sb(s);
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
112 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
113 {
114         struct quad_buffer_head qbh;
115         unsigned *bits;
116         unsigned i, count;
117         if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
118         count = 0;
119         for (i = 0; i < 2048 / sizeof(unsigned); i++) {
120                 unsigned b; 
121                 if (!bits[i]) continue;
122                 for (b = bits[i]; b; b>>=1) count += b & 1;
123         }
124         hpfs_brelse4(&qbh);
125         return count;
126 }
127
128 static unsigned count_bitmaps(struct super_block *s)
129 {
130         unsigned n, count, n_bands;
131         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
132         count = 0;
133         for (n = 0; n < n_bands; n++)
134                 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
135         return count;
136 }
137
138 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
139 {
140         struct super_block *s = dentry->d_sb;
141         struct hpfs_sb_info *sbi = hpfs_sb(s);
142         lock_kernel();
143
144         /*if (sbi->sb_n_free == -1) {*/
145                 sbi->sb_n_free = count_bitmaps(s);
146                 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
147         /*}*/
148         buf->f_type = s->s_magic;
149         buf->f_bsize = 512;
150         buf->f_blocks = sbi->sb_fs_size;
151         buf->f_bfree = sbi->sb_n_free;
152         buf->f_bavail = sbi->sb_n_free;
153         buf->f_files = sbi->sb_dirband_size / 4;
154         buf->f_ffree = sbi->sb_n_free_dnodes;
155         buf->f_namelen = 254;
156
157         unlock_kernel();
158
159         return 0;
160 }
161
162 static kmem_cache_t * hpfs_inode_cachep;
163
164 static struct inode *hpfs_alloc_inode(struct super_block *sb)
165 {
166         struct hpfs_inode_info *ei;
167         ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, SLAB_NOFS);
168         if (!ei)
169                 return NULL;
170         ei->vfs_inode.i_version = 1;
171         return &ei->vfs_inode;
172 }
173
174 static void hpfs_destroy_inode(struct inode *inode)
175 {
176         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
177 }
178
179 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
180 {
181         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
182
183         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
184             SLAB_CTOR_CONSTRUCTOR) {
185                 mutex_init(&ei->i_mutex);
186                 mutex_init(&ei->i_parent_mutex);
187                 inode_init_once(&ei->vfs_inode);
188         }
189 }
190  
191 static int init_inodecache(void)
192 {
193         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
194                                              sizeof(struct hpfs_inode_info),
195                                              0, (SLAB_RECLAIM_ACCOUNT|
196                                                 SLAB_MEM_SPREAD),
197                                              init_once, NULL);
198         if (hpfs_inode_cachep == NULL)
199                 return -ENOMEM;
200         return 0;
201 }
202
203 static void destroy_inodecache(void)
204 {
205         if (kmem_cache_destroy(hpfs_inode_cachep))
206                 printk(KERN_INFO "hpfs_inode_cache: not all structures were freed\n");
207 }
208
209 /*
210  * A tiny parser for option strings, stolen from dosfs.
211  * Stolen again from read-only hpfs.
212  * And updated for table-driven option parsing.
213  */
214
215 enum {
216         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
217         Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
218         Opt_check_none, Opt_check_normal, Opt_check_strict,
219         Opt_err_cont, Opt_err_ro, Opt_err_panic,
220         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
221         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
222         Opt_timeshift, Opt_err,
223 };
224
225 static match_table_t tokens = {
226         {Opt_help, "help"},
227         {Opt_uid, "uid=%u"},
228         {Opt_gid, "gid=%u"},
229         {Opt_umask, "umask=%o"},
230         {Opt_case_lower, "case=lower"},
231         {Opt_case_asis, "case=asis"},
232         {Opt_conv_binary, "conv=binary"},
233         {Opt_conv_text, "conv=text"},
234         {Opt_conv_auto, "conv=auto"},
235         {Opt_check_none, "check=none"},
236         {Opt_check_normal, "check=normal"},
237         {Opt_check_strict, "check=strict"},
238         {Opt_err_cont, "errors=continue"},
239         {Opt_err_ro, "errors=remount-ro"},
240         {Opt_err_panic, "errors=panic"},
241         {Opt_eas_no, "eas=no"},
242         {Opt_eas_ro, "eas=ro"},
243         {Opt_eas_rw, "eas=rw"},
244         {Opt_chkdsk_no, "chkdsk=no"},
245         {Opt_chkdsk_errors, "chkdsk=errors"},
246         {Opt_chkdsk_always, "chkdsk=always"},
247         {Opt_timeshift, "timeshift=%d"},
248         {Opt_err, NULL},
249 };
250
251 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
252                       int *lowercase, int *conv, int *eas, int *chk, int *errs,
253                       int *chkdsk, int *timeshift)
254 {
255         char *p;
256         int option;
257
258         if (!opts)
259                 return 1;
260
261         /*printk("Parsing opts: '%s'\n",opts);*/
262
263         while ((p = strsep(&opts, ",")) != NULL) {
264                 substring_t args[MAX_OPT_ARGS];
265                 int token;
266                 if (!*p)
267                         continue;
268
269                 token = match_token(p, tokens, args);
270                 switch (token) {
271                 case Opt_help:
272                         return 2;
273                 case Opt_uid:
274                         if (match_int(args, &option))
275                                 return 0;
276                         *uid = option;
277                         break;
278                 case Opt_gid:
279                         if (match_int(args, &option))
280                                 return 0;
281                         *gid = option;
282                         break;
283                 case Opt_umask:
284                         if (match_octal(args, &option))
285                                 return 0;
286                         *umask = option;
287                         break;
288                 case Opt_case_lower:
289                         *lowercase = 1;
290                         break;
291                 case Opt_case_asis:
292                         *lowercase = 0;
293                         break;
294                 case Opt_conv_binary:
295                         *conv = CONV_BINARY;
296                         break;
297                 case Opt_conv_text:
298                         *conv = CONV_TEXT;
299                         break;
300                 case Opt_conv_auto:
301                         *conv = CONV_AUTO;
302                         break;
303                 case Opt_check_none:
304                         *chk = 0;
305                         break;
306                 case Opt_check_normal:
307                         *chk = 1;
308                         break;
309                 case Opt_check_strict:
310                         *chk = 2;
311                         break;
312                 case Opt_err_cont:
313                         *errs = 0;
314                         break;
315                 case Opt_err_ro:
316                         *errs = 1;
317                         break;
318                 case Opt_err_panic:
319                         *errs = 2;
320                         break;
321                 case Opt_eas_no:
322                         *eas = 0;
323                         break;
324                 case Opt_eas_ro:
325                         *eas = 1;
326                         break;
327                 case Opt_eas_rw:
328                         *eas = 2;
329                         break;
330                 case Opt_chkdsk_no:
331                         *chkdsk = 0;
332                         break;
333                 case Opt_chkdsk_errors:
334                         *chkdsk = 1;
335                         break;
336                 case Opt_chkdsk_always:
337                         *chkdsk = 2;
338                         break;
339                 case Opt_timeshift:
340                 {
341                         int m = 1;
342                         char *rhs = args[0].from;
343                         if (!rhs || !*rhs)
344                                 return 0;
345                         if (*rhs == '-') m = -1;
346                         if (*rhs == '+' || *rhs == '-') rhs++;
347                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
348                         if (*rhs)
349                                 return 0;
350                         break;
351                 }
352                 default:
353                         return 0;
354                 }
355         }
356         return 1;
357 }
358
359 static inline void hpfs_help(void)
360 {
361         printk("\n\
362 HPFS filesystem options:\n\
363       help              do not mount and display this text\n\
364       uid=xxx           set uid of files that don't have uid specified in eas\n\
365       gid=xxx           set gid of files that don't have gid specified in eas\n\
366       umask=xxx         set mode of files that don't have mode specified in eas\n\
367       case=lower        lowercase all files\n\
368       case=asis         do not lowercase files (default)\n\
369       conv=binary       do not convert CR/LF -> LF (default)\n\
370       conv=auto         convert only files with known text extensions\n\
371       conv=text         convert all files\n\
372       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
373       check=normal      do some checks - it should not crash (default)\n\
374       check=strict      do extra time-consuming checks, used for debugging\n\
375       errors=continue   continue on errors\n\
376       errors=remount-ro remount read-only if errors found (default)\n\
377       errors=panic      panic on errors\n\
378       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
379       chkdsk=errors     mark fs dirty if errors found (default)\n\
380       chkdsk=always     always mark fs dirty - used for debugging\n\
381       eas=no            ignore extended attributes\n\
382       eas=ro            read but do not write extended attributes\n\
383       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
384       timeshift=nnn     add nnn seconds to file times\n\
385 \n");
386 }
387
388 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
389 {
390         uid_t uid;
391         gid_t gid;
392         umode_t umask;
393         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
394         int o;
395         struct hpfs_sb_info *sbi = hpfs_sb(s);
396         
397         *flags |= MS_NOATIME;
398         
399         uid = sbi->sb_uid; gid = sbi->sb_gid;
400         umask = 0777 & ~sbi->sb_mode;
401         lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
402         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
403         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
404
405         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
406             &eas, &chk, &errs, &chkdsk, &timeshift))) {
407                 printk("HPFS: bad mount options.\n");
408                 return 1;
409         }
410         if (o == 2) {
411                 hpfs_help();
412                 return 1;
413         }
414         if (timeshift != sbi->sb_timeshift) {
415                 printk("HPFS: timeshift can't be changed using remount.\n");
416                 return 1;
417         }
418
419         unmark_dirty(s);
420
421         sbi->sb_uid = uid; sbi->sb_gid = gid;
422         sbi->sb_mode = 0777 & ~umask;
423         sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
424         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
425         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
426
427         if (!(*flags & MS_RDONLY)) mark_dirty(s);
428
429         return 0;
430 }
431
432 /* Super operations */
433
434 static struct super_operations hpfs_sops =
435 {
436         .alloc_inode    = hpfs_alloc_inode,
437         .destroy_inode  = hpfs_destroy_inode,
438         .delete_inode   = hpfs_delete_inode,
439         .put_super      = hpfs_put_super,
440         .statfs         = hpfs_statfs,
441         .remount_fs     = hpfs_remount_fs,
442 };
443
444 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
445 {
446         struct buffer_head *bh0, *bh1, *bh2;
447         struct hpfs_boot_block *bootblock;
448         struct hpfs_super_block *superblock;
449         struct hpfs_spare_block *spareblock;
450         struct hpfs_sb_info *sbi;
451         struct inode *root;
452
453         uid_t uid;
454         gid_t gid;
455         umode_t umask;
456         int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
457
458         dnode_secno root_dno;
459         struct hpfs_dirent *de = NULL;
460         struct quad_buffer_head qbh;
461
462         int o;
463
464         sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
465         if (!sbi)
466                 return -ENOMEM;
467         s->s_fs_info = sbi;
468         memset(sbi, 0, sizeof(*sbi));
469
470         sbi->sb_bmp_dir = NULL;
471         sbi->sb_cp_table = NULL;
472
473         init_MUTEX(&sbi->hpfs_creation_de);
474
475         uid = current->uid;
476         gid = current->gid;
477         umask = current->fs->umask;
478         lowercase = 0;
479         conv = CONV_BINARY;
480         eas = 2;
481         chk = 1;
482         errs = 1;
483         chkdsk = 1;
484         timeshift = 0;
485
486         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
487             &eas, &chk, &errs, &chkdsk, &timeshift))) {
488                 printk("HPFS: bad mount options.\n");
489                 goto bail0;
490         }
491         if (o==2) {
492                 hpfs_help();
493                 goto bail0;
494         }
495
496         /*sbi->sb_mounting = 1;*/
497         sb_set_blocksize(s, 512);
498         sbi->sb_fs_size = -1;
499         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
500         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
501         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
502
503         /* Check magics */
504         if (/*bootblock->magic != BB_MAGIC
505             ||*/ superblock->magic != SB_MAGIC
506             || spareblock->magic != SP_MAGIC) {
507                 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
508                 goto bail4;
509         }
510
511         /* Check version */
512         if (!(s->s_flags & MS_RDONLY) &&
513               superblock->funcversion != 2 && superblock->funcversion != 3) {
514                 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
515                         (int)superblock->version, (int)superblock->funcversion);
516                 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");
517                 goto bail4;
518         }
519
520         s->s_flags |= MS_NOATIME;
521
522         /* Fill superblock stuff */
523         s->s_magic = HPFS_SUPER_MAGIC;
524         s->s_op = &hpfs_sops;
525
526         sbi->sb_root = superblock->root;
527         sbi->sb_fs_size = superblock->n_sectors;
528         sbi->sb_bitmaps = superblock->bitmaps;
529         sbi->sb_dirband_start = superblock->dir_band_start;
530         sbi->sb_dirband_size = superblock->n_dir_band;
531         sbi->sb_dmap = superblock->dir_band_bitmap;
532         sbi->sb_uid = uid;
533         sbi->sb_gid = gid;
534         sbi->sb_mode = 0777 & ~umask;
535         sbi->sb_n_free = -1;
536         sbi->sb_n_free_dnodes = -1;
537         sbi->sb_lowercase = lowercase;
538         sbi->sb_conv = conv;
539         sbi->sb_eas = eas;
540         sbi->sb_chk = chk;
541         sbi->sb_chkdsk = chkdsk;
542         sbi->sb_err = errs;
543         sbi->sb_timeshift = timeshift;
544         sbi->sb_was_error = 0;
545         sbi->sb_cp_table = NULL;
546         sbi->sb_c_bitmap = -1;
547         sbi->sb_max_fwd_alloc = 0xffffff;
548         
549         /* Load bitmap directory */
550         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
551                 goto bail4;
552         
553         /* Check for general fs errors*/
554         if (spareblock->dirty && !spareblock->old_wrote) {
555                 if (errs == 2) {
556                         printk("HPFS: Improperly stopped, not mounted\n");
557                         goto bail4;
558                 }
559                 hpfs_error(s, "improperly stopped");
560         }
561
562         if (!(s->s_flags & MS_RDONLY)) {
563                 spareblock->dirty = 1;
564                 spareblock->old_wrote = 0;
565                 mark_buffer_dirty(bh2);
566         }
567
568         if (spareblock->hotfixes_used || spareblock->n_spares_used) {
569                 if (errs >= 2) {
570                         printk("HPFS: Hotfixes not supported here, try chkdsk\n");
571                         mark_dirty(s);
572                         goto bail4;
573                 }
574                 hpfs_error(s, "hotfixes not supported here, try chkdsk");
575                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
576                 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
577         }
578         if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
579                 if (errs >= 2) {
580                         printk("HPFS: Spare dnodes used, try chkdsk\n");
581                         mark_dirty(s);
582                         goto bail4;
583                 }
584                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
585                 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
586         }
587         if (chk) {
588                 unsigned a;
589                 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
590                     superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
591                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
592                                 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
593                         goto bail4;
594                 }
595                 a = sbi->sb_dirband_size;
596                 sbi->sb_dirband_size = 0;
597                 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
598                     hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
599                     hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
600                         mark_dirty(s);
601                         goto bail4;
602                 }
603                 sbi->sb_dirband_size = a;
604         } else printk("HPFS: You really don't want any checks? You are crazy...\n");
605
606         /* Load code page table */
607         if (spareblock->n_code_pages)
608                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
609                         printk("HPFS: Warning: code page support is disabled\n");
610
611         brelse(bh2);
612         brelse(bh1);
613         brelse(bh0);
614
615         root = iget_locked(s, sbi->sb_root);
616         if (!root)
617                 goto bail0;
618         hpfs_init_inode(root);
619         hpfs_read_inode(root);
620         unlock_new_inode(root);
621         s->s_root = d_alloc_root(root);
622         if (!s->s_root) {
623                 iput(root);
624                 goto bail0;
625         }
626         hpfs_set_dentry_operations(s->s_root);
627
628         /*
629          * find the root directory's . pointer & finish filling in the inode
630          */
631
632         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
633         if (root_dno)
634                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
635         if (!de)
636                 hpfs_error(s, "unable to find root dir");
637         else {
638                 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
639                 root->i_atime.tv_nsec = 0;
640                 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
641                 root->i_mtime.tv_nsec = 0;
642                 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
643                 root->i_ctime.tv_nsec = 0;
644                 hpfs_i(root)->i_ea_size = de->ea_size;
645                 hpfs_i(root)->i_parent_dir = root->i_ino;
646                 if (root->i_size == -1)
647                         root->i_size = 2048;
648                 if (root->i_blocks == -1)
649                         root->i_blocks = 5;
650                 hpfs_brelse4(&qbh);
651         }
652         return 0;
653
654 bail4:  brelse(bh2);
655 bail3:  brelse(bh1);
656 bail2:  brelse(bh0);
657 bail1:
658 bail0:
659         kfree(sbi->sb_bmp_dir);
660         kfree(sbi->sb_cp_table);
661         s->s_fs_info = NULL;
662         kfree(sbi);
663         return -EINVAL;
664 }
665
666 static int hpfs_get_sb(struct file_system_type *fs_type,
667         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
668 {
669         return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
670                            mnt);
671 }
672
673 static struct file_system_type hpfs_fs_type = {
674         .owner          = THIS_MODULE,
675         .name           = "hpfs",
676         .get_sb         = hpfs_get_sb,
677         .kill_sb        = kill_block_super,
678         .fs_flags       = FS_REQUIRES_DEV,
679 };
680
681 static int __init init_hpfs_fs(void)
682 {
683         int err = init_inodecache();
684         if (err)
685                 goto out1;
686         err = register_filesystem(&hpfs_fs_type);
687         if (err)
688                 goto out;
689         return 0;
690 out:
691         destroy_inodecache();
692 out1:
693         return err;
694 }
695
696 static void __exit exit_hpfs_fs(void)
697 {
698         unregister_filesystem(&hpfs_fs_type);
699         destroy_inodecache();
700 }
701
702 module_init(init_hpfs_fs)
703 module_exit(exit_hpfs_fs)
704 MODULE_LICENSE("GPL");