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
mark_dirty(struct super_block * s,int remount)22 static void mark_dirty(struct super_block *s, int remount)
23 {
24 if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) {
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
unmark_dirty(struct super_block * s)40 static void unmark_dirty(struct super_block *s)
41 {
42 struct buffer_head *bh;
43 struct hpfs_spare_block *sb;
44 if (s->s_flags & MS_RDONLY) 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... */
hpfs_error(struct super_block * s,const char * fmt,...)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 (s->s_flags & MS_RDONLY)
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 |= MS_RDONLY;
82 }
83 } else if (s->s_flags & MS_RDONLY)
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
hpfs_stop_cycles(struct super_block * s,int key,int * c1,int * c2,char * msg)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
free_sbi(struct hpfs_sb_info * sbi)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
lazy_free_sbi(struct rcu_head * rcu)119 static void lazy_free_sbi(struct rcu_head *rcu)
120 {
121 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
122 }
123
hpfs_put_super(struct super_block * s)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
hpfs_count_one_bitmap(struct super_block * s,secno secno)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
count_bitmaps(struct super_block * s)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
hpfs_get_free_dnodes(struct super_block * s)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
hpfs_statfs(struct dentry * dentry,struct kstatfs * buf)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 static struct kmem_cache * hpfs_inode_cachep;
204
hpfs_alloc_inode(struct super_block * sb)205 static struct inode *hpfs_alloc_inode(struct super_block *sb)
206 {
207 struct hpfs_inode_info *ei;
208 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
209 if (!ei)
210 return NULL;
211 ei->vfs_inode.i_version = 1;
212 return &ei->vfs_inode;
213 }
214
hpfs_i_callback(struct rcu_head * head)215 static void hpfs_i_callback(struct rcu_head *head)
216 {
217 struct inode *inode = container_of(head, struct inode, i_rcu);
218 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
219 }
220
hpfs_destroy_inode(struct inode * inode)221 static void hpfs_destroy_inode(struct inode *inode)
222 {
223 call_rcu(&inode->i_rcu, hpfs_i_callback);
224 }
225
init_once(void * foo)226 static void init_once(void *foo)
227 {
228 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
229
230 inode_init_once(&ei->vfs_inode);
231 }
232
init_inodecache(void)233 static int init_inodecache(void)
234 {
235 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
236 sizeof(struct hpfs_inode_info),
237 0, (SLAB_RECLAIM_ACCOUNT|
238 SLAB_MEM_SPREAD),
239 init_once);
240 if (hpfs_inode_cachep == NULL)
241 return -ENOMEM;
242 return 0;
243 }
244
destroy_inodecache(void)245 static void destroy_inodecache(void)
246 {
247 /*
248 * Make sure all delayed rcu free inodes are flushed before we
249 * destroy cache.
250 */
251 rcu_barrier();
252 kmem_cache_destroy(hpfs_inode_cachep);
253 }
254
255 /*
256 * A tiny parser for option strings, stolen from dosfs.
257 * Stolen again from read-only hpfs.
258 * And updated for table-driven option parsing.
259 */
260
261 enum {
262 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
263 Opt_check_none, Opt_check_normal, Opt_check_strict,
264 Opt_err_cont, Opt_err_ro, Opt_err_panic,
265 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
266 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
267 Opt_timeshift, Opt_err,
268 };
269
270 static const match_table_t tokens = {
271 {Opt_help, "help"},
272 {Opt_uid, "uid=%u"},
273 {Opt_gid, "gid=%u"},
274 {Opt_umask, "umask=%o"},
275 {Opt_case_lower, "case=lower"},
276 {Opt_case_asis, "case=asis"},
277 {Opt_check_none, "check=none"},
278 {Opt_check_normal, "check=normal"},
279 {Opt_check_strict, "check=strict"},
280 {Opt_err_cont, "errors=continue"},
281 {Opt_err_ro, "errors=remount-ro"},
282 {Opt_err_panic, "errors=panic"},
283 {Opt_eas_no, "eas=no"},
284 {Opt_eas_ro, "eas=ro"},
285 {Opt_eas_rw, "eas=rw"},
286 {Opt_chkdsk_no, "chkdsk=no"},
287 {Opt_chkdsk_errors, "chkdsk=errors"},
288 {Opt_chkdsk_always, "chkdsk=always"},
289 {Opt_timeshift, "timeshift=%d"},
290 {Opt_err, NULL},
291 };
292
parse_opts(char * opts,kuid_t * uid,kgid_t * gid,umode_t * umask,int * lowercase,int * eas,int * chk,int * errs,int * chkdsk,int * timeshift)293 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
294 int *lowercase, int *eas, int *chk, int *errs,
295 int *chkdsk, int *timeshift)
296 {
297 char *p;
298 int option;
299
300 if (!opts)
301 return 1;
302
303 /*pr_info("Parsing opts: '%s'\n",opts);*/
304
305 while ((p = strsep(&opts, ",")) != NULL) {
306 substring_t args[MAX_OPT_ARGS];
307 int token;
308 if (!*p)
309 continue;
310
311 token = match_token(p, tokens, args);
312 switch (token) {
313 case Opt_help:
314 return 2;
315 case Opt_uid:
316 if (match_int(args, &option))
317 return 0;
318 *uid = make_kuid(current_user_ns(), option);
319 if (!uid_valid(*uid))
320 return 0;
321 break;
322 case Opt_gid:
323 if (match_int(args, &option))
324 return 0;
325 *gid = make_kgid(current_user_ns(), option);
326 if (!gid_valid(*gid))
327 return 0;
328 break;
329 case Opt_umask:
330 if (match_octal(args, &option))
331 return 0;
332 *umask = option;
333 break;
334 case Opt_case_lower:
335 *lowercase = 1;
336 break;
337 case Opt_case_asis:
338 *lowercase = 0;
339 break;
340 case Opt_check_none:
341 *chk = 0;
342 break;
343 case Opt_check_normal:
344 *chk = 1;
345 break;
346 case Opt_check_strict:
347 *chk = 2;
348 break;
349 case Opt_err_cont:
350 *errs = 0;
351 break;
352 case Opt_err_ro:
353 *errs = 1;
354 break;
355 case Opt_err_panic:
356 *errs = 2;
357 break;
358 case Opt_eas_no:
359 *eas = 0;
360 break;
361 case Opt_eas_ro:
362 *eas = 1;
363 break;
364 case Opt_eas_rw:
365 *eas = 2;
366 break;
367 case Opt_chkdsk_no:
368 *chkdsk = 0;
369 break;
370 case Opt_chkdsk_errors:
371 *chkdsk = 1;
372 break;
373 case Opt_chkdsk_always:
374 *chkdsk = 2;
375 break;
376 case Opt_timeshift:
377 {
378 int m = 1;
379 char *rhs = args[0].from;
380 if (!rhs || !*rhs)
381 return 0;
382 if (*rhs == '-') m = -1;
383 if (*rhs == '+' || *rhs == '-') rhs++;
384 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
385 if (*rhs)
386 return 0;
387 break;
388 }
389 default:
390 return 0;
391 }
392 }
393 return 1;
394 }
395
hpfs_help(void)396 static inline void hpfs_help(void)
397 {
398 pr_info("\n\
399 HPFS filesystem options:\n\
400 help do not mount and display this text\n\
401 uid=xxx set uid of files that don't have uid specified in eas\n\
402 gid=xxx set gid of files that don't have gid specified in eas\n\
403 umask=xxx set mode of files that don't have mode specified in eas\n\
404 case=lower lowercase all files\n\
405 case=asis do not lowercase files (default)\n\
406 check=none no fs checks - kernel may crash on corrupted filesystem\n\
407 check=normal do some checks - it should not crash (default)\n\
408 check=strict do extra time-consuming checks, used for debugging\n\
409 errors=continue continue on errors\n\
410 errors=remount-ro remount read-only if errors found (default)\n\
411 errors=panic panic on errors\n\
412 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
413 chkdsk=errors mark fs dirty if errors found (default)\n\
414 chkdsk=always always mark fs dirty - used for debugging\n\
415 eas=no ignore extended attributes\n\
416 eas=ro read but do not write extended attributes\n\
417 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
418 timeshift=nnn add nnn seconds to file times\n\
419 \n");
420 }
421
hpfs_remount_fs(struct super_block * s,int * flags,char * data)422 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
423 {
424 kuid_t uid;
425 kgid_t gid;
426 umode_t umask;
427 int lowercase, eas, chk, errs, chkdsk, timeshift;
428 int o;
429 struct hpfs_sb_info *sbi = hpfs_sb(s);
430
431 sync_filesystem(s);
432
433 *flags |= MS_NOATIME;
434
435 hpfs_lock(s);
436 uid = sbi->sb_uid; gid = sbi->sb_gid;
437 umask = 0777 & ~sbi->sb_mode;
438 lowercase = sbi->sb_lowercase;
439 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
440 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
441
442 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
443 &eas, &chk, &errs, &chkdsk, ×hift))) {
444 pr_err("bad mount options.\n");
445 goto out_err;
446 }
447 if (o == 2) {
448 hpfs_help();
449 goto out_err;
450 }
451 if (timeshift != sbi->sb_timeshift) {
452 pr_err("timeshift can't be changed using remount.\n");
453 goto out_err;
454 }
455
456 unmark_dirty(s);
457
458 sbi->sb_uid = uid; sbi->sb_gid = gid;
459 sbi->sb_mode = 0777 & ~umask;
460 sbi->sb_lowercase = lowercase;
461 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
462 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
463
464 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
465
466 hpfs_unlock(s);
467 return 0;
468
469 out_err:
470 hpfs_unlock(s);
471 return -EINVAL;
472 }
473
hpfs_show_options(struct seq_file * seq,struct dentry * root)474 static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
475 {
476 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
477
478 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
479 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
480 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
481 if (sbi->sb_lowercase)
482 seq_printf(seq, ",case=lower");
483 if (!sbi->sb_chk)
484 seq_printf(seq, ",check=none");
485 if (sbi->sb_chk == 2)
486 seq_printf(seq, ",check=strict");
487 if (!sbi->sb_err)
488 seq_printf(seq, ",errors=continue");
489 if (sbi->sb_err == 2)
490 seq_printf(seq, ",errors=panic");
491 if (!sbi->sb_chkdsk)
492 seq_printf(seq, ",chkdsk=no");
493 if (sbi->sb_chkdsk == 2)
494 seq_printf(seq, ",chkdsk=always");
495 if (!sbi->sb_eas)
496 seq_printf(seq, ",eas=no");
497 if (sbi->sb_eas == 1)
498 seq_printf(seq, ",eas=ro");
499 if (sbi->sb_timeshift)
500 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
501 return 0;
502 }
503
504 /* Super operations */
505
506 static const struct super_operations hpfs_sops =
507 {
508 .alloc_inode = hpfs_alloc_inode,
509 .destroy_inode = hpfs_destroy_inode,
510 .evict_inode = hpfs_evict_inode,
511 .put_super = hpfs_put_super,
512 .statfs = hpfs_statfs,
513 .remount_fs = hpfs_remount_fs,
514 .show_options = hpfs_show_options,
515 };
516
hpfs_fill_super(struct super_block * s,void * options,int silent)517 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
518 {
519 struct buffer_head *bh0, *bh1, *bh2;
520 struct hpfs_boot_block *bootblock;
521 struct hpfs_super_block *superblock;
522 struct hpfs_spare_block *spareblock;
523 struct hpfs_sb_info *sbi;
524 struct inode *root;
525
526 kuid_t uid;
527 kgid_t gid;
528 umode_t umask;
529 int lowercase, eas, chk, errs, chkdsk, timeshift;
530
531 dnode_secno root_dno;
532 struct hpfs_dirent *de = NULL;
533 struct quad_buffer_head qbh;
534
535 int o;
536
537 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
538 if (!sbi) {
539 return -ENOMEM;
540 }
541 s->s_fs_info = sbi;
542
543 mutex_init(&sbi->hpfs_mutex);
544 hpfs_lock(s);
545
546 uid = current_uid();
547 gid = current_gid();
548 umask = current_umask();
549 lowercase = 0;
550 eas = 2;
551 chk = 1;
552 errs = 1;
553 chkdsk = 1;
554 timeshift = 0;
555
556 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
557 &eas, &chk, &errs, &chkdsk, ×hift))) {
558 pr_err("bad mount options.\n");
559 goto bail0;
560 }
561 if (o==2) {
562 hpfs_help();
563 goto bail0;
564 }
565
566 /*sbi->sb_mounting = 1;*/
567 sb_set_blocksize(s, 512);
568 sbi->sb_fs_size = -1;
569 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
570 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
571 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
572
573 /* Check magics */
574 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
575 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
576 || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
577 if (!silent)
578 pr_err("Bad magic ... probably not HPFS\n");
579 goto bail4;
580 }
581
582 /* Check version */
583 if (!(s->s_flags & MS_RDONLY) &&
584 superblock->funcversion != 2 && superblock->funcversion != 3) {
585 pr_err("Bad version %d,%d. Mount readonly to go around\n",
586 (int)superblock->version, (int)superblock->funcversion);
587 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");
588 goto bail4;
589 }
590
591 s->s_flags |= MS_NOATIME;
592
593 /* Fill superblock stuff */
594 s->s_magic = HPFS_SUPER_MAGIC;
595 s->s_op = &hpfs_sops;
596 s->s_d_op = &hpfs_dentry_operations;
597
598 sbi->sb_root = le32_to_cpu(superblock->root);
599 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
600 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
601 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
602 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
603 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
604 sbi->sb_uid = uid;
605 sbi->sb_gid = gid;
606 sbi->sb_mode = 0777 & ~umask;
607 sbi->sb_n_free = -1;
608 sbi->sb_n_free_dnodes = -1;
609 sbi->sb_lowercase = lowercase;
610 sbi->sb_eas = eas;
611 sbi->sb_chk = chk;
612 sbi->sb_chkdsk = chkdsk;
613 sbi->sb_err = errs;
614 sbi->sb_timeshift = timeshift;
615 sbi->sb_was_error = 0;
616 sbi->sb_cp_table = NULL;
617 sbi->sb_c_bitmap = -1;
618 sbi->sb_max_fwd_alloc = 0xffffff;
619
620 if (sbi->sb_fs_size >= 0x80000000) {
621 hpfs_error(s, "invalid size in superblock: %08x",
622 (unsigned)sbi->sb_fs_size);
623 goto bail4;
624 }
625
626 /* Load bitmap directory */
627 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
628 goto bail4;
629
630 /* Check for general fs errors*/
631 if (spareblock->dirty && !spareblock->old_wrote) {
632 if (errs == 2) {
633 pr_err("Improperly stopped, not mounted\n");
634 goto bail4;
635 }
636 hpfs_error(s, "improperly stopped");
637 }
638
639 if (!(s->s_flags & MS_RDONLY)) {
640 spareblock->dirty = 1;
641 spareblock->old_wrote = 0;
642 mark_buffer_dirty(bh2);
643 }
644
645 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
646 if (errs >= 2) {
647 pr_err("Hotfixes not supported here, try chkdsk\n");
648 mark_dirty(s, 0);
649 goto bail4;
650 }
651 hpfs_error(s, "hotfixes not supported here, try chkdsk");
652 if (errs == 0)
653 pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n");
654 else
655 pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n");
656 }
657 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
658 if (errs >= 2) {
659 pr_err("Spare dnodes used, try chkdsk\n");
660 mark_dirty(s, 0);
661 goto bail4;
662 }
663 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
664 if (errs == 0)
665 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
666 }
667 if (chk) {
668 unsigned a;
669 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
670 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
671 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
672 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
673 goto bail4;
674 }
675 a = sbi->sb_dirband_size;
676 sbi->sb_dirband_size = 0;
677 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
678 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
679 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
680 mark_dirty(s, 0);
681 goto bail4;
682 }
683 sbi->sb_dirband_size = a;
684 } else
685 pr_err("You really don't want any checks? You are crazy...\n");
686
687 /* Load code page table */
688 if (le32_to_cpu(spareblock->n_code_pages))
689 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
690 pr_err("code page support is disabled\n");
691
692 brelse(bh2);
693 brelse(bh1);
694 brelse(bh0);
695
696 root = iget_locked(s, sbi->sb_root);
697 if (!root)
698 goto bail0;
699 hpfs_init_inode(root);
700 hpfs_read_inode(root);
701 unlock_new_inode(root);
702 s->s_root = d_make_root(root);
703 if (!s->s_root)
704 goto bail0;
705
706 /*
707 * find the root directory's . pointer & finish filling in the inode
708 */
709
710 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
711 if (root_dno)
712 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
713 if (!de)
714 hpfs_error(s, "unable to find root dir");
715 else {
716 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
717 root->i_atime.tv_nsec = 0;
718 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
719 root->i_mtime.tv_nsec = 0;
720 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
721 root->i_ctime.tv_nsec = 0;
722 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
723 hpfs_i(root)->i_parent_dir = root->i_ino;
724 if (root->i_size == -1)
725 root->i_size = 2048;
726 if (root->i_blocks == -1)
727 root->i_blocks = 5;
728 hpfs_brelse4(&qbh);
729 }
730 hpfs_unlock(s);
731 return 0;
732
733 bail4: brelse(bh2);
734 bail3: brelse(bh1);
735 bail2: brelse(bh0);
736 bail1:
737 bail0:
738 hpfs_unlock(s);
739 free_sbi(sbi);
740 return -EINVAL;
741 }
742
hpfs_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)743 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
744 int flags, const char *dev_name, void *data)
745 {
746 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
747 }
748
749 static struct file_system_type hpfs_fs_type = {
750 .owner = THIS_MODULE,
751 .name = "hpfs",
752 .mount = hpfs_mount,
753 .kill_sb = kill_block_super,
754 .fs_flags = FS_REQUIRES_DEV,
755 };
756 MODULE_ALIAS_FS("hpfs");
757
init_hpfs_fs(void)758 static int __init init_hpfs_fs(void)
759 {
760 int err = init_inodecache();
761 if (err)
762 goto out1;
763 err = register_filesystem(&hpfs_fs_type);
764 if (err)
765 goto out;
766 return 0;
767 out:
768 destroy_inodecache();
769 out1:
770 return err;
771 }
772
exit_hpfs_fs(void)773 static void __exit exit_hpfs_fs(void)
774 {
775 unregister_filesystem(&hpfs_fs_type);
776 destroy_inodecache();
777 }
778
779 module_init(init_hpfs_fs)
780 module_exit(exit_hpfs_fs)
781 MODULE_LICENSE("GPL");
782