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TOMOYO Linux Cross Reference
Linux/fs/hpfs/super.c

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  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 #include <linux/seq_file.h>
 19 
 20 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
 21 
 22 static void mark_dirty(struct super_block *s, int remount)
 23 {
 24         if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) {
 25                 struct buffer_head *bh;
 26                 struct hpfs_spare_block *sb;
 27                 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
 28                         sb->dirty = 1;
 29                         sb->old_wrote = 0;
 30                         mark_buffer_dirty(bh);
 31                         sync_dirty_buffer(bh);
 32                         brelse(bh);
 33                 }
 34         }
 35 }
 36 
 37 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
 38    were errors) */
 39 
 40 static void unmark_dirty(struct super_block *s)
 41 {
 42         struct buffer_head *bh;
 43         struct hpfs_spare_block *sb;
 44         if (sb_rdonly(s)) return;
 45         sync_blockdev(s->s_bdev);
 46         if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
 47                 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
 48                 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
 49                 mark_buffer_dirty(bh);
 50                 sync_dirty_buffer(bh);
 51                 brelse(bh);
 52         }
 53 }
 54 
 55 /* Filesystem error... */
 56 void hpfs_error(struct super_block *s, const char *fmt, ...)
 57 {
 58         struct va_format vaf;
 59         va_list args;
 60 
 61         va_start(args, fmt);
 62 
 63         vaf.fmt = fmt;
 64         vaf.va = &args;
 65 
 66         pr_err("filesystem error: %pV", &vaf);
 67 
 68         va_end(args);
 69 
 70         if (!hpfs_sb(s)->sb_was_error) {
 71                 if (hpfs_sb(s)->sb_err == 2) {
 72                         pr_cont("; crashing the system because you wanted it\n");
 73                         mark_dirty(s, 0);
 74                         panic("HPFS panic");
 75                 } else if (hpfs_sb(s)->sb_err == 1) {
 76                         if (sb_rdonly(s))
 77                                 pr_cont("; already mounted read-only\n");
 78                         else {
 79                                 pr_cont("; remounting read-only\n");
 80                                 mark_dirty(s, 0);
 81                                 s->s_flags |= SB_RDONLY;
 82                         }
 83                 } else if (sb_rdonly(s))
 84                                 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
 85                 else
 86                         pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
 87         } else
 88                 pr_cont("\n");
 89         hpfs_sb(s)->sb_was_error = 1;
 90 }
 91 
 92 /* 
 93  * A little trick to detect cycles in many hpfs structures and don't let the
 94  * kernel crash on corrupted filesystem. When first called, set c2 to 0.
 95  *
 96  * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
 97  * nested each in other, chkdsk locked up happilly.
 98  */
 99 
100 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
101                 char *msg)
102 {
103         if (*c2 && *c1 == key) {
104                 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
105                 return 1;
106         }
107         (*c2)++;
108         if (!((*c2 - 1) & *c2)) *c1 = key;
109         return 0;
110 }
111 
112 static void free_sbi(struct hpfs_sb_info *sbi)
113 {
114         kfree(sbi->sb_cp_table);
115         kfree(sbi->sb_bmp_dir);
116         kfree(sbi);
117 }
118 
119 static void lazy_free_sbi(struct rcu_head *rcu)
120 {
121         free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
122 }
123 
124 static void hpfs_put_super(struct super_block *s)
125 {
126         hpfs_lock(s);
127         unmark_dirty(s);
128         hpfs_unlock(s);
129         call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
130 }
131 
132 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
133 {
134         struct quad_buffer_head qbh;
135         unsigned long *bits;
136         unsigned count;
137 
138         bits = hpfs_map_4sectors(s, secno, &qbh, 0);
139         if (!bits)
140                 return (unsigned)-1;
141         count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
142         hpfs_brelse4(&qbh);
143         return count;
144 }
145 
146 static unsigned count_bitmaps(struct super_block *s)
147 {
148         unsigned n, count, n_bands;
149         n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
150         count = 0;
151         for (n = 0; n < COUNT_RD_AHEAD; n++) {
152                 hpfs_prefetch_bitmap(s, n);
153         }
154         for (n = 0; n < n_bands; n++) {
155                 unsigned c;
156                 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
157                 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
158                 if (c != (unsigned)-1)
159                         count += c;
160         }
161         return count;
162 }
163 
164 unsigned hpfs_get_free_dnodes(struct super_block *s)
165 {
166         struct hpfs_sb_info *sbi = hpfs_sb(s);
167         if (sbi->sb_n_free_dnodes == (unsigned)-1) {
168                 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
169                 if (c == (unsigned)-1)
170                         return 0;
171                 sbi->sb_n_free_dnodes = c;
172         }
173         return sbi->sb_n_free_dnodes;
174 }
175 
176 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
177 {
178         struct super_block *s = dentry->d_sb;
179         struct hpfs_sb_info *sbi = hpfs_sb(s);
180         u64 id = huge_encode_dev(s->s_bdev->bd_dev);
181 
182         hpfs_lock(s);
183 
184         if (sbi->sb_n_free == (unsigned)-1)
185                 sbi->sb_n_free = count_bitmaps(s);
186 
187         buf->f_type = s->s_magic;
188         buf->f_bsize = 512;
189         buf->f_blocks = sbi->sb_fs_size;
190         buf->f_bfree = sbi->sb_n_free;
191         buf->f_bavail = sbi->sb_n_free;
192         buf->f_files = sbi->sb_dirband_size / 4;
193         buf->f_ffree = hpfs_get_free_dnodes(s);
194         buf->f_fsid.val[0] = (u32)id;
195         buf->f_fsid.val[1] = (u32)(id >> 32);
196         buf->f_namelen = 254;
197 
198         hpfs_unlock(s);
199 
200         return 0;
201 }
202 
203 
204 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
205 {
206         switch (cmd) {
207                 case FITRIM: {
208                         struct fstrim_range range;
209                         secno n_trimmed;
210                         int r;
211                         if (!capable(CAP_SYS_ADMIN))
212                                 return -EPERM;
213                         if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
214                                 return -EFAULT;
215                         r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
216                         if (r)
217                                 return r;
218                         range.len = (u64)n_trimmed << 9;
219                         if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
220                                 return -EFAULT;
221                         return 0;
222                 }
223                 default: {
224                         return -ENOIOCTLCMD;
225                 }
226         }
227 }
228 
229 
230 static struct kmem_cache * hpfs_inode_cachep;
231 
232 static struct inode *hpfs_alloc_inode(struct super_block *sb)
233 {
234         struct hpfs_inode_info *ei;
235         ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
236         if (!ei)
237                 return NULL;
238         return &ei->vfs_inode;
239 }
240 
241 static void hpfs_i_callback(struct rcu_head *head)
242 {
243         struct inode *inode = container_of(head, struct inode, i_rcu);
244         kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
245 }
246 
247 static void hpfs_destroy_inode(struct inode *inode)
248 {
249         call_rcu(&inode->i_rcu, hpfs_i_callback);
250 }
251 
252 static void init_once(void *foo)
253 {
254         struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
255 
256         inode_init_once(&ei->vfs_inode);
257 }
258 
259 static int init_inodecache(void)
260 {
261         hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
262                                              sizeof(struct hpfs_inode_info),
263                                              0, (SLAB_RECLAIM_ACCOUNT|
264                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
265                                              init_once);
266         if (hpfs_inode_cachep == NULL)
267                 return -ENOMEM;
268         return 0;
269 }
270 
271 static void destroy_inodecache(void)
272 {
273         /*
274          * Make sure all delayed rcu free inodes are flushed before we
275          * destroy cache.
276          */
277         rcu_barrier();
278         kmem_cache_destroy(hpfs_inode_cachep);
279 }
280 
281 /*
282  * A tiny parser for option strings, stolen from dosfs.
283  * Stolen again from read-only hpfs.
284  * And updated for table-driven option parsing.
285  */
286 
287 enum {
288         Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
289         Opt_check_none, Opt_check_normal, Opt_check_strict,
290         Opt_err_cont, Opt_err_ro, Opt_err_panic,
291         Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
292         Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
293         Opt_timeshift, Opt_err,
294 };
295 
296 static const match_table_t tokens = {
297         {Opt_help, "help"},
298         {Opt_uid, "uid=%u"},
299         {Opt_gid, "gid=%u"},
300         {Opt_umask, "umask=%o"},
301         {Opt_case_lower, "case=lower"},
302         {Opt_case_asis, "case=asis"},
303         {Opt_check_none, "check=none"},
304         {Opt_check_normal, "check=normal"},
305         {Opt_check_strict, "check=strict"},
306         {Opt_err_cont, "errors=continue"},
307         {Opt_err_ro, "errors=remount-ro"},
308         {Opt_err_panic, "errors=panic"},
309         {Opt_eas_no, "eas=no"},
310         {Opt_eas_ro, "eas=ro"},
311         {Opt_eas_rw, "eas=rw"},
312         {Opt_chkdsk_no, "chkdsk=no"},
313         {Opt_chkdsk_errors, "chkdsk=errors"},
314         {Opt_chkdsk_always, "chkdsk=always"},
315         {Opt_timeshift, "timeshift=%d"},
316         {Opt_err, NULL},
317 };
318 
319 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
320                       int *lowercase, int *eas, int *chk, int *errs,
321                       int *chkdsk, int *timeshift)
322 {
323         char *p;
324         int option;
325 
326         if (!opts)
327                 return 1;
328 
329         /*pr_info("Parsing opts: '%s'\n",opts);*/
330 
331         while ((p = strsep(&opts, ",")) != NULL) {
332                 substring_t args[MAX_OPT_ARGS];
333                 int token;
334                 if (!*p)
335                         continue;
336 
337                 token = match_token(p, tokens, args);
338                 switch (token) {
339                 case Opt_help:
340                         return 2;
341                 case Opt_uid:
342                         if (match_int(args, &option))
343                                 return 0;
344                         *uid = make_kuid(current_user_ns(), option);
345                         if (!uid_valid(*uid))
346                                 return 0;
347                         break;
348                 case Opt_gid:
349                         if (match_int(args, &option))
350                                 return 0;
351                         *gid = make_kgid(current_user_ns(), option);
352                         if (!gid_valid(*gid))
353                                 return 0;
354                         break;
355                 case Opt_umask:
356                         if (match_octal(args, &option))
357                                 return 0;
358                         *umask = option;
359                         break;
360                 case Opt_case_lower:
361                         *lowercase = 1;
362                         break;
363                 case Opt_case_asis:
364                         *lowercase = 0;
365                         break;
366                 case Opt_check_none:
367                         *chk = 0;
368                         break;
369                 case Opt_check_normal:
370                         *chk = 1;
371                         break;
372                 case Opt_check_strict:
373                         *chk = 2;
374                         break;
375                 case Opt_err_cont:
376                         *errs = 0;
377                         break;
378                 case Opt_err_ro:
379                         *errs = 1;
380                         break;
381                 case Opt_err_panic:
382                         *errs = 2;
383                         break;
384                 case Opt_eas_no:
385                         *eas = 0;
386                         break;
387                 case Opt_eas_ro:
388                         *eas = 1;
389                         break;
390                 case Opt_eas_rw:
391                         *eas = 2;
392                         break;
393                 case Opt_chkdsk_no:
394                         *chkdsk = 0;
395                         break;
396                 case Opt_chkdsk_errors:
397                         *chkdsk = 1;
398                         break;
399                 case Opt_chkdsk_always:
400                         *chkdsk = 2;
401                         break;
402                 case Opt_timeshift:
403                 {
404                         int m = 1;
405                         char *rhs = args[0].from;
406                         if (!rhs || !*rhs)
407                                 return 0;
408                         if (*rhs == '-') m = -1;
409                         if (*rhs == '+' || *rhs == '-') rhs++;
410                         *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
411                         if (*rhs)
412                                 return 0;
413                         break;
414                 }
415                 default:
416                         return 0;
417                 }
418         }
419         return 1;
420 }
421 
422 static inline void hpfs_help(void)
423 {
424         pr_info("\n\
425 HPFS filesystem options:\n\
426       help              do not mount and display this text\n\
427       uid=xxx           set uid of files that don't have uid specified in eas\n\
428       gid=xxx           set gid of files that don't have gid specified in eas\n\
429       umask=xxx         set mode of files that don't have mode specified in eas\n\
430       case=lower        lowercase all files\n\
431       case=asis         do not lowercase files (default)\n\
432       check=none        no fs checks - kernel may crash on corrupted filesystem\n\
433       check=normal      do some checks - it should not crash (default)\n\
434       check=strict      do extra time-consuming checks, used for debugging\n\
435       errors=continue   continue on errors\n\
436       errors=remount-ro remount read-only if errors found (default)\n\
437       errors=panic      panic on errors\n\
438       chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
439       chkdsk=errors     mark fs dirty if errors found (default)\n\
440       chkdsk=always     always mark fs dirty - used for debugging\n\
441       eas=no            ignore extended attributes\n\
442       eas=ro            read but do not write extended attributes\n\
443       eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
444       timeshift=nnn     add nnn seconds to file times\n\
445 \n");
446 }
447 
448 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
449 {
450         kuid_t uid;
451         kgid_t gid;
452         umode_t umask;
453         int lowercase, eas, chk, errs, chkdsk, timeshift;
454         int o;
455         struct hpfs_sb_info *sbi = hpfs_sb(s);
456 
457         sync_filesystem(s);
458 
459         *flags |= SB_NOATIME;
460 
461         hpfs_lock(s);
462         uid = sbi->sb_uid; gid = sbi->sb_gid;
463         umask = 0777 & ~sbi->sb_mode;
464         lowercase = sbi->sb_lowercase;
465         eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
466         errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
467 
468         if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
469             &eas, &chk, &errs, &chkdsk, &timeshift))) {
470                 pr_err("bad mount options.\n");
471                 goto out_err;
472         }
473         if (o == 2) {
474                 hpfs_help();
475                 goto out_err;
476         }
477         if (timeshift != sbi->sb_timeshift) {
478                 pr_err("timeshift can't be changed using remount.\n");
479                 goto out_err;
480         }
481 
482         unmark_dirty(s);
483 
484         sbi->sb_uid = uid; sbi->sb_gid = gid;
485         sbi->sb_mode = 0777 & ~umask;
486         sbi->sb_lowercase = lowercase;
487         sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
488         sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
489 
490         if (!(*flags & SB_RDONLY)) mark_dirty(s, 1);
491 
492         hpfs_unlock(s);
493         return 0;
494 
495 out_err:
496         hpfs_unlock(s);
497         return -EINVAL;
498 }
499 
500 static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
501 {
502         struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
503 
504         seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
505         seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
506         seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
507         if (sbi->sb_lowercase)
508                 seq_printf(seq, ",case=lower");
509         if (!sbi->sb_chk)
510                 seq_printf(seq, ",check=none");
511         if (sbi->sb_chk == 2)
512                 seq_printf(seq, ",check=strict");
513         if (!sbi->sb_err)
514                 seq_printf(seq, ",errors=continue");
515         if (sbi->sb_err == 2)
516                 seq_printf(seq, ",errors=panic");
517         if (!sbi->sb_chkdsk)
518                 seq_printf(seq, ",chkdsk=no");
519         if (sbi->sb_chkdsk == 2)
520                 seq_printf(seq, ",chkdsk=always");
521         if (!sbi->sb_eas)
522                 seq_printf(seq, ",eas=no");
523         if (sbi->sb_eas == 1)
524                 seq_printf(seq, ",eas=ro");
525         if (sbi->sb_timeshift)
526                 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
527         return 0;
528 }
529 
530 /* Super operations */
531 
532 static const struct super_operations hpfs_sops =
533 {
534         .alloc_inode    = hpfs_alloc_inode,
535         .destroy_inode  = hpfs_destroy_inode,
536         .evict_inode    = hpfs_evict_inode,
537         .put_super      = hpfs_put_super,
538         .statfs         = hpfs_statfs,
539         .remount_fs     = hpfs_remount_fs,
540         .show_options   = hpfs_show_options,
541 };
542 
543 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
544 {
545         struct buffer_head *bh0, *bh1, *bh2;
546         struct hpfs_boot_block *bootblock;
547         struct hpfs_super_block *superblock;
548         struct hpfs_spare_block *spareblock;
549         struct hpfs_sb_info *sbi;
550         struct inode *root;
551 
552         kuid_t uid;
553         kgid_t gid;
554         umode_t umask;
555         int lowercase, eas, chk, errs, chkdsk, timeshift;
556 
557         dnode_secno root_dno;
558         struct hpfs_dirent *de = NULL;
559         struct quad_buffer_head qbh;
560 
561         int o;
562 
563         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
564         if (!sbi) {
565                 return -ENOMEM;
566         }
567         s->s_fs_info = sbi;
568 
569         mutex_init(&sbi->hpfs_mutex);
570         hpfs_lock(s);
571 
572         uid = current_uid();
573         gid = current_gid();
574         umask = current_umask();
575         lowercase = 0;
576         eas = 2;
577         chk = 1;
578         errs = 1;
579         chkdsk = 1;
580         timeshift = 0;
581 
582         if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
583             &eas, &chk, &errs, &chkdsk, &timeshift))) {
584                 pr_err("bad mount options.\n");
585                 goto bail0;
586         }
587         if (o==2) {
588                 hpfs_help();
589                 goto bail0;
590         }
591 
592         /*sbi->sb_mounting = 1;*/
593         sb_set_blocksize(s, 512);
594         sbi->sb_fs_size = -1;
595         if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
596         if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
597         if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
598 
599         /* Check magics */
600         if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
601             ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
602             || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
603                 if (!silent)
604                         pr_err("Bad magic ... probably not HPFS\n");
605                 goto bail4;
606         }
607 
608         /* Check version */
609         if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
610                 pr_err("Bad version %d,%d. Mount readonly to go around\n",
611                         (int)superblock->version, (int)superblock->funcversion);
612                 pr_err("please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n");
613                 goto bail4;
614         }
615 
616         s->s_flags |= SB_NOATIME;
617 
618         /* Fill superblock stuff */
619         s->s_magic = HPFS_SUPER_MAGIC;
620         s->s_op = &hpfs_sops;
621         s->s_d_op = &hpfs_dentry_operations;
622 
623         sbi->sb_root = le32_to_cpu(superblock->root);
624         sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
625         sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
626         sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
627         sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
628         sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
629         sbi->sb_uid = uid;
630         sbi->sb_gid = gid;
631         sbi->sb_mode = 0777 & ~umask;
632         sbi->sb_n_free = -1;
633         sbi->sb_n_free_dnodes = -1;
634         sbi->sb_lowercase = lowercase;
635         sbi->sb_eas = eas;
636         sbi->sb_chk = chk;
637         sbi->sb_chkdsk = chkdsk;
638         sbi->sb_err = errs;
639         sbi->sb_timeshift = timeshift;
640         sbi->sb_was_error = 0;
641         sbi->sb_cp_table = NULL;
642         sbi->sb_c_bitmap = -1;
643         sbi->sb_max_fwd_alloc = 0xffffff;
644 
645         if (sbi->sb_fs_size >= 0x80000000) {
646                 hpfs_error(s, "invalid size in superblock: %08x",
647                         (unsigned)sbi->sb_fs_size);
648                 goto bail4;
649         }
650 
651         if (spareblock->n_spares_used)
652                 hpfs_load_hotfix_map(s, spareblock);
653 
654         /* Load bitmap directory */
655         if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
656                 goto bail4;
657         
658         /* Check for general fs errors*/
659         if (spareblock->dirty && !spareblock->old_wrote) {
660                 if (errs == 2) {
661                         pr_err("Improperly stopped, not mounted\n");
662                         goto bail4;
663                 }
664                 hpfs_error(s, "improperly stopped");
665         }
666 
667         if (!sb_rdonly(s)) {
668                 spareblock->dirty = 1;
669                 spareblock->old_wrote = 0;
670                 mark_buffer_dirty(bh2);
671         }
672 
673         if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
674                 if (errs >= 2) {
675                         pr_err("Spare dnodes used, try chkdsk\n");
676                         mark_dirty(s, 0);
677                         goto bail4;
678                 }
679                 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
680                 if (errs == 0)
681                         pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
682         }
683         if (chk) {
684                 unsigned a;
685                 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
686                     le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
687                         hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
688                                 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
689                         goto bail4;
690                 }
691                 a = sbi->sb_dirband_size;
692                 sbi->sb_dirband_size = 0;
693                 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
694                     hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
695                     hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
696                         mark_dirty(s, 0);
697                         goto bail4;
698                 }
699                 sbi->sb_dirband_size = a;
700         } else
701                 pr_err("You really don't want any checks? You are crazy...\n");
702 
703         /* Load code page table */
704         if (le32_to_cpu(spareblock->n_code_pages))
705                 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
706                         pr_err("code page support is disabled\n");
707 
708         brelse(bh2);
709         brelse(bh1);
710         brelse(bh0);
711 
712         root = iget_locked(s, sbi->sb_root);
713         if (!root)
714                 goto bail0;
715         hpfs_init_inode(root);
716         hpfs_read_inode(root);
717         unlock_new_inode(root);
718         s->s_root = d_make_root(root);
719         if (!s->s_root)
720                 goto bail0;
721 
722         /*
723          * find the root directory's . pointer & finish filling in the inode
724          */
725 
726         root_dno = hpfs_fnode_dno(s, sbi->sb_root);
727         if (root_dno)
728                 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
729         if (!de)
730                 hpfs_error(s, "unable to find root dir");
731         else {
732                 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
733                 root->i_atime.tv_nsec = 0;
734                 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
735                 root->i_mtime.tv_nsec = 0;
736                 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
737                 root->i_ctime.tv_nsec = 0;
738                 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
739                 hpfs_i(root)->i_parent_dir = root->i_ino;
740                 if (root->i_size == -1)
741                         root->i_size = 2048;
742                 if (root->i_blocks == -1)
743                         root->i_blocks = 5;
744                 hpfs_brelse4(&qbh);
745         }
746         hpfs_unlock(s);
747         return 0;
748 
749 bail4:  brelse(bh2);
750 bail3:  brelse(bh1);
751 bail2:  brelse(bh0);
752 bail1:
753 bail0:
754         hpfs_unlock(s);
755         free_sbi(sbi);
756         return -EINVAL;
757 }
758 
759 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
760         int flags, const char *dev_name, void *data)
761 {
762         return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
763 }
764 
765 static struct file_system_type hpfs_fs_type = {
766         .owner          = THIS_MODULE,
767         .name           = "hpfs",
768         .mount          = hpfs_mount,
769         .kill_sb        = kill_block_super,
770         .fs_flags       = FS_REQUIRES_DEV,
771 };
772 MODULE_ALIAS_FS("hpfs");
773 
774 static int __init init_hpfs_fs(void)
775 {
776         int err = init_inodecache();
777         if (err)
778                 goto out1;
779         err = register_filesystem(&hpfs_fs_type);
780         if (err)
781                 goto out;
782         return 0;
783 out:
784         destroy_inodecache();
785 out1:
786         return err;
787 }
788 
789 static void __exit exit_hpfs_fs(void)
790 {
791         unregister_filesystem(&hpfs_fs_type);
792         destroy_inodecache();
793 }
794 
795 module_init(init_hpfs_fs)
796 module_exit(exit_hpfs_fs)
797 MODULE_LICENSE("GPL");
798 

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