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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/hpfs/super.c
4 *
5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 *
7 * mounting, unmounting, error handling
8 */
9
10#include "hpfs_fn.h"
11#include <linux/module.h>
12#include <linux/parser.h>
13#include <linux/init.h>
14#include <linux/statfs.h>
15#include <linux/magic.h>
16#include <linux/sched.h>
17#include <linux/bitmap.h>
18#include <linux/slab.h>
19#include <linux/seq_file.h>
20
21/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
22
23static void mark_dirty(struct super_block *s, int remount)
24{
25 if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) {
26 struct buffer_head *bh;
27 struct hpfs_spare_block *sb;
28 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
29 sb->dirty = 1;
30 sb->old_wrote = 0;
31 mark_buffer_dirty(bh);
32 sync_dirty_buffer(bh);
33 brelse(bh);
34 }
35 }
36}
37
38/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
39 were errors) */
40
41static void unmark_dirty(struct super_block *s)
42{
43 struct buffer_head *bh;
44 struct hpfs_spare_block *sb;
45 if (sb_rdonly(s)) return;
46 sync_blockdev(s->s_bdev);
47 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
48 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
49 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
50 mark_buffer_dirty(bh);
51 sync_dirty_buffer(bh);
52 brelse(bh);
53 }
54}
55
56/* Filesystem error... */
57void hpfs_error(struct super_block *s, const char *fmt, ...)
58{
59 struct va_format vaf;
60 va_list args;
61
62 va_start(args, fmt);
63
64 vaf.fmt = fmt;
65 vaf.va = &args;
66
67 pr_err("filesystem error: %pV", &vaf);
68
69 va_end(args);
70
71 if (!hpfs_sb(s)->sb_was_error) {
72 if (hpfs_sb(s)->sb_err == 2) {
73 pr_cont("; crashing the system because you wanted it\n");
74 mark_dirty(s, 0);
75 panic("HPFS panic");
76 } else if (hpfs_sb(s)->sb_err == 1) {
77 if (sb_rdonly(s))
78 pr_cont("; already mounted read-only\n");
79 else {
80 pr_cont("; remounting read-only\n");
81 mark_dirty(s, 0);
82 s->s_flags |= SB_RDONLY;
83 }
84 } else if (sb_rdonly(s))
85 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
86 else
87 pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
88 } else
89 pr_cont("\n");
90 hpfs_sb(s)->sb_was_error = 1;
91}
92
93/*
94 * A little trick to detect cycles in many hpfs structures and don't let the
95 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
96 *
97 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
98 * nested each in other, chkdsk locked up happilly.
99 */
100
101int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
102 char *msg)
103{
104 if (*c2 && *c1 == key) {
105 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
106 return 1;
107 }
108 (*c2)++;
109 if (!((*c2 - 1) & *c2)) *c1 = key;
110 return 0;
111}
112
113static void free_sbi(struct hpfs_sb_info *sbi)
114{
115 kfree(sbi->sb_cp_table);
116 kfree(sbi->sb_bmp_dir);
117 kfree(sbi);
118}
119
120static void lazy_free_sbi(struct rcu_head *rcu)
121{
122 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
123}
124
125static void hpfs_put_super(struct super_block *s)
126{
127 hpfs_lock(s);
128 unmark_dirty(s);
129 hpfs_unlock(s);
130 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
131}
132
133static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
134{
135 struct quad_buffer_head qbh;
136 unsigned long *bits;
137 unsigned count;
138
139 bits = hpfs_map_4sectors(s, secno, &qbh, 0);
140 if (!bits)
141 return (unsigned)-1;
142 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
143 hpfs_brelse4(&qbh);
144 return count;
145}
146
147static unsigned count_bitmaps(struct super_block *s)
148{
149 unsigned n, count, n_bands;
150 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
151 count = 0;
152 for (n = 0; n < COUNT_RD_AHEAD; n++) {
153 hpfs_prefetch_bitmap(s, n);
154 }
155 for (n = 0; n < n_bands; n++) {
156 unsigned c;
157 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
158 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
159 if (c != (unsigned)-1)
160 count += c;
161 }
162 return count;
163}
164
165unsigned hpfs_get_free_dnodes(struct super_block *s)
166{
167 struct hpfs_sb_info *sbi = hpfs_sb(s);
168 if (sbi->sb_n_free_dnodes == (unsigned)-1) {
169 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
170 if (c == (unsigned)-1)
171 return 0;
172 sbi->sb_n_free_dnodes = c;
173 }
174 return sbi->sb_n_free_dnodes;
175}
176
177static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
178{
179 struct super_block *s = dentry->d_sb;
180 struct hpfs_sb_info *sbi = hpfs_sb(s);
181 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
182
183 hpfs_lock(s);
184
185 if (sbi->sb_n_free == (unsigned)-1)
186 sbi->sb_n_free = count_bitmaps(s);
187
188 buf->f_type = s->s_magic;
189 buf->f_bsize = 512;
190 buf->f_blocks = sbi->sb_fs_size;
191 buf->f_bfree = sbi->sb_n_free;
192 buf->f_bavail = sbi->sb_n_free;
193 buf->f_files = sbi->sb_dirband_size / 4;
194 buf->f_ffree = hpfs_get_free_dnodes(s);
195 buf->f_fsid.val[0] = (u32)id;
196 buf->f_fsid.val[1] = (u32)(id >> 32);
197 buf->f_namelen = 254;
198
199 hpfs_unlock(s);
200
201 return 0;
202}
203
204
205long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
206{
207 switch (cmd) {
208 case FITRIM: {
209 struct fstrim_range range;
210 secno n_trimmed;
211 int r;
212 if (!capable(CAP_SYS_ADMIN))
213 return -EPERM;
214 if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
215 return -EFAULT;
216 r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
217 if (r)
218 return r;
219 range.len = (u64)n_trimmed << 9;
220 if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
221 return -EFAULT;
222 return 0;
223 }
224 default: {
225 return -ENOIOCTLCMD;
226 }
227 }
228}
229
230
231static struct kmem_cache * hpfs_inode_cachep;
232
233static struct inode *hpfs_alloc_inode(struct super_block *sb)
234{
235 struct hpfs_inode_info *ei;
236 ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
237 if (!ei)
238 return NULL;
239 return &ei->vfs_inode;
240}
241
242static void hpfs_free_inode(struct inode *inode)
243{
244 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
245}
246
247static void init_once(void *foo)
248{
249 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
250
251 inode_init_once(&ei->vfs_inode);
252}
253
254static int init_inodecache(void)
255{
256 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
257 sizeof(struct hpfs_inode_info),
258 0, (SLAB_RECLAIM_ACCOUNT|
259 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
260 init_once);
261 if (hpfs_inode_cachep == NULL)
262 return -ENOMEM;
263 return 0;
264}
265
266static void destroy_inodecache(void)
267{
268 /*
269 * Make sure all delayed rcu free inodes are flushed before we
270 * destroy cache.
271 */
272 rcu_barrier();
273 kmem_cache_destroy(hpfs_inode_cachep);
274}
275
276/*
277 * A tiny parser for option strings, stolen from dosfs.
278 * Stolen again from read-only hpfs.
279 * And updated for table-driven option parsing.
280 */
281
282enum {
283 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
284 Opt_check_none, Opt_check_normal, Opt_check_strict,
285 Opt_err_cont, Opt_err_ro, Opt_err_panic,
286 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
287 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
288 Opt_timeshift, Opt_err,
289};
290
291static const match_table_t tokens = {
292 {Opt_help, "help"},
293 {Opt_uid, "uid=%u"},
294 {Opt_gid, "gid=%u"},
295 {Opt_umask, "umask=%o"},
296 {Opt_case_lower, "case=lower"},
297 {Opt_case_asis, "case=asis"},
298 {Opt_check_none, "check=none"},
299 {Opt_check_normal, "check=normal"},
300 {Opt_check_strict, "check=strict"},
301 {Opt_err_cont, "errors=continue"},
302 {Opt_err_ro, "errors=remount-ro"},
303 {Opt_err_panic, "errors=panic"},
304 {Opt_eas_no, "eas=no"},
305 {Opt_eas_ro, "eas=ro"},
306 {Opt_eas_rw, "eas=rw"},
307 {Opt_chkdsk_no, "chkdsk=no"},
308 {Opt_chkdsk_errors, "chkdsk=errors"},
309 {Opt_chkdsk_always, "chkdsk=always"},
310 {Opt_timeshift, "timeshift=%d"},
311 {Opt_err, NULL},
312};
313
314static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
315 int *lowercase, int *eas, int *chk, int *errs,
316 int *chkdsk, int *timeshift)
317{
318 char *p;
319 int option;
320
321 if (!opts)
322 return 1;
323
324 /*pr_info("Parsing opts: '%s'\n",opts);*/
325
326 while ((p = strsep(&opts, ",")) != NULL) {
327 substring_t args[MAX_OPT_ARGS];
328 int token;
329 if (!*p)
330 continue;
331
332 token = match_token(p, tokens, args);
333 switch (token) {
334 case Opt_help:
335 return 2;
336 case Opt_uid:
337 if (match_int(args, &option))
338 return 0;
339 *uid = make_kuid(current_user_ns(), option);
340 if (!uid_valid(*uid))
341 return 0;
342 break;
343 case Opt_gid:
344 if (match_int(args, &option))
345 return 0;
346 *gid = make_kgid(current_user_ns(), option);
347 if (!gid_valid(*gid))
348 return 0;
349 break;
350 case Opt_umask:
351 if (match_octal(args, &option))
352 return 0;
353 *umask = option;
354 break;
355 case Opt_case_lower:
356 *lowercase = 1;
357 break;
358 case Opt_case_asis:
359 *lowercase = 0;
360 break;
361 case Opt_check_none:
362 *chk = 0;
363 break;
364 case Opt_check_normal:
365 *chk = 1;
366 break;
367 case Opt_check_strict:
368 *chk = 2;
369 break;
370 case Opt_err_cont:
371 *errs = 0;
372 break;
373 case Opt_err_ro:
374 *errs = 1;
375 break;
376 case Opt_err_panic:
377 *errs = 2;
378 break;
379 case Opt_eas_no:
380 *eas = 0;
381 break;
382 case Opt_eas_ro:
383 *eas = 1;
384 break;
385 case Opt_eas_rw:
386 *eas = 2;
387 break;
388 case Opt_chkdsk_no:
389 *chkdsk = 0;
390 break;
391 case Opt_chkdsk_errors:
392 *chkdsk = 1;
393 break;
394 case Opt_chkdsk_always:
395 *chkdsk = 2;
396 break;
397 case Opt_timeshift:
398 {
399 int m = 1;
400 char *rhs = args[0].from;
401 if (!rhs || !*rhs)
402 return 0;
403 if (*rhs == '-') m = -1;
404 if (*rhs == '+' || *rhs == '-') rhs++;
405 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
406 if (*rhs)
407 return 0;
408 break;
409 }
410 default:
411 return 0;
412 }
413 }
414 return 1;
415}
416
417static inline void hpfs_help(void)
418{
419 pr_info("\n\
420HPFS filesystem options:\n\
421 help do not mount and display this text\n\
422 uid=xxx set uid of files that don't have uid specified in eas\n\
423 gid=xxx set gid of files that don't have gid specified in eas\n\
424 umask=xxx set mode of files that don't have mode specified in eas\n\
425 case=lower lowercase all files\n\
426 case=asis do not lowercase files (default)\n\
427 check=none no fs checks - kernel may crash on corrupted filesystem\n\
428 check=normal do some checks - it should not crash (default)\n\
429 check=strict do extra time-consuming checks, used for debugging\n\
430 errors=continue continue on errors\n\
431 errors=remount-ro remount read-only if errors found (default)\n\
432 errors=panic panic on errors\n\
433 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
434 chkdsk=errors mark fs dirty if errors found (default)\n\
435 chkdsk=always always mark fs dirty - used for debugging\n\
436 eas=no ignore extended attributes\n\
437 eas=ro read but do not write extended attributes\n\
438 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
439 timeshift=nnn add nnn seconds to file times\n\
440\n");
441}
442
443static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
444{
445 kuid_t uid;
446 kgid_t gid;
447 umode_t umask;
448 int lowercase, eas, chk, errs, chkdsk, timeshift;
449 int o;
450 struct hpfs_sb_info *sbi = hpfs_sb(s);
451
452 sync_filesystem(s);
453
454 *flags |= SB_NOATIME;
455
456 hpfs_lock(s);
457 uid = sbi->sb_uid; gid = sbi->sb_gid;
458 umask = 0777 & ~sbi->sb_mode;
459 lowercase = sbi->sb_lowercase;
460 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
461 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
462
463 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
464 &eas, &chk, &errs, &chkdsk, ×hift))) {
465 pr_err("bad mount options.\n");
466 goto out_err;
467 }
468 if (o == 2) {
469 hpfs_help();
470 goto out_err;
471 }
472 if (timeshift != sbi->sb_timeshift) {
473 pr_err("timeshift can't be changed using remount.\n");
474 goto out_err;
475 }
476
477 unmark_dirty(s);
478
479 sbi->sb_uid = uid; sbi->sb_gid = gid;
480 sbi->sb_mode = 0777 & ~umask;
481 sbi->sb_lowercase = lowercase;
482 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
483 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
484
485 if (!(*flags & SB_RDONLY)) mark_dirty(s, 1);
486
487 hpfs_unlock(s);
488 return 0;
489
490out_err:
491 hpfs_unlock(s);
492 return -EINVAL;
493}
494
495static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
496{
497 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
498
499 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
500 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
501 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
502 if (sbi->sb_lowercase)
503 seq_printf(seq, ",case=lower");
504 if (!sbi->sb_chk)
505 seq_printf(seq, ",check=none");
506 if (sbi->sb_chk == 2)
507 seq_printf(seq, ",check=strict");
508 if (!sbi->sb_err)
509 seq_printf(seq, ",errors=continue");
510 if (sbi->sb_err == 2)
511 seq_printf(seq, ",errors=panic");
512 if (!sbi->sb_chkdsk)
513 seq_printf(seq, ",chkdsk=no");
514 if (sbi->sb_chkdsk == 2)
515 seq_printf(seq, ",chkdsk=always");
516 if (!sbi->sb_eas)
517 seq_printf(seq, ",eas=no");
518 if (sbi->sb_eas == 1)
519 seq_printf(seq, ",eas=ro");
520 if (sbi->sb_timeshift)
521 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
522 return 0;
523}
524
525/* Super operations */
526
527static const struct super_operations hpfs_sops =
528{
529 .alloc_inode = hpfs_alloc_inode,
530 .free_inode = hpfs_free_inode,
531 .evict_inode = hpfs_evict_inode,
532 .put_super = hpfs_put_super,
533 .statfs = hpfs_statfs,
534 .remount_fs = hpfs_remount_fs,
535 .show_options = hpfs_show_options,
536};
537
538static int hpfs_fill_super(struct super_block *s, void *options, int silent)
539{
540 struct buffer_head *bh0, *bh1, *bh2;
541 struct hpfs_boot_block *bootblock;
542 struct hpfs_super_block *superblock;
543 struct hpfs_spare_block *spareblock;
544 struct hpfs_sb_info *sbi;
545 struct inode *root;
546
547 kuid_t uid;
548 kgid_t gid;
549 umode_t umask;
550 int lowercase, eas, chk, errs, chkdsk, timeshift;
551
552 dnode_secno root_dno;
553 struct hpfs_dirent *de = NULL;
554 struct quad_buffer_head qbh;
555
556 int o;
557
558 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
559 if (!sbi) {
560 return -ENOMEM;
561 }
562 s->s_fs_info = sbi;
563
564 mutex_init(&sbi->hpfs_mutex);
565 hpfs_lock(s);
566
567 uid = current_uid();
568 gid = current_gid();
569 umask = current_umask();
570 lowercase = 0;
571 eas = 2;
572 chk = 1;
573 errs = 1;
574 chkdsk = 1;
575 timeshift = 0;
576
577 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
578 &eas, &chk, &errs, &chkdsk, ×hift))) {
579 pr_err("bad mount options.\n");
580 goto bail0;
581 }
582 if (o==2) {
583 hpfs_help();
584 goto bail0;
585 }
586
587 /*sbi->sb_mounting = 1;*/
588 sb_set_blocksize(s, 512);
589 sbi->sb_fs_size = -1;
590 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
591 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
592 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
593
594 /* Check magics */
595 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
596 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
597 || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
598 if (!silent)
599 pr_err("Bad magic ... probably not HPFS\n");
600 goto bail4;
601 }
602
603 /* Check version */
604 if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
605 pr_err("Bad version %d,%d. Mount readonly to go around\n",
606 (int)superblock->version, (int)superblock->funcversion);
607 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");
608 goto bail4;
609 }
610
611 s->s_flags |= SB_NOATIME;
612
613 /* Fill superblock stuff */
614 s->s_magic = HPFS_SUPER_MAGIC;
615 s->s_op = &hpfs_sops;
616 s->s_d_op = &hpfs_dentry_operations;
617 s->s_time_min = local_to_gmt(s, 0);
618 s->s_time_max = local_to_gmt(s, U32_MAX);
619
620 sbi->sb_root = le32_to_cpu(superblock->root);
621 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
622 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
623 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
624 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
625 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
626 sbi->sb_uid = uid;
627 sbi->sb_gid = gid;
628 sbi->sb_mode = 0777 & ~umask;
629 sbi->sb_n_free = -1;
630 sbi->sb_n_free_dnodes = -1;
631 sbi->sb_lowercase = lowercase;
632 sbi->sb_eas = eas;
633 sbi->sb_chk = chk;
634 sbi->sb_chkdsk = chkdsk;
635 sbi->sb_err = errs;
636 sbi->sb_timeshift = timeshift;
637 sbi->sb_was_error = 0;
638 sbi->sb_cp_table = NULL;
639 sbi->sb_c_bitmap = -1;
640 sbi->sb_max_fwd_alloc = 0xffffff;
641
642 if (sbi->sb_fs_size >= 0x80000000) {
643 hpfs_error(s, "invalid size in superblock: %08x",
644 (unsigned)sbi->sb_fs_size);
645 goto bail4;
646 }
647
648 if (spareblock->n_spares_used)
649 hpfs_load_hotfix_map(s, spareblock);
650
651 /* Load bitmap directory */
652 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
653 goto bail4;
654
655 /* Check for general fs errors*/
656 if (spareblock->dirty && !spareblock->old_wrote) {
657 if (errs == 2) {
658 pr_err("Improperly stopped, not mounted\n");
659 goto bail4;
660 }
661 hpfs_error(s, "improperly stopped");
662 }
663
664 if (!sb_rdonly(s)) {
665 spareblock->dirty = 1;
666 spareblock->old_wrote = 0;
667 mark_buffer_dirty(bh2);
668 }
669
670 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
671 if (errs >= 2) {
672 pr_err("Spare dnodes used, try chkdsk\n");
673 mark_dirty(s, 0);
674 goto bail4;
675 }
676 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
677 if (errs == 0)
678 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
679 }
680 if (chk) {
681 unsigned a;
682 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
683 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
684 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
685 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
686 goto bail4;
687 }
688 a = sbi->sb_dirband_size;
689 sbi->sb_dirband_size = 0;
690 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
691 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
692 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
693 mark_dirty(s, 0);
694 goto bail4;
695 }
696 sbi->sb_dirband_size = a;
697 } else
698 pr_err("You really don't want any checks? You are crazy...\n");
699
700 /* Load code page table */
701 if (le32_to_cpu(spareblock->n_code_pages))
702 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
703 pr_err("code page support is disabled\n");
704
705 brelse(bh2);
706 brelse(bh1);
707 brelse(bh0);
708
709 root = iget_locked(s, sbi->sb_root);
710 if (!root)
711 goto bail0;
712 hpfs_init_inode(root);
713 hpfs_read_inode(root);
714 unlock_new_inode(root);
715 s->s_root = d_make_root(root);
716 if (!s->s_root)
717 goto bail0;
718
719 /*
720 * find the root directory's . pointer & finish filling in the inode
721 */
722
723 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
724 if (root_dno)
725 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
726 if (!de)
727 hpfs_error(s, "unable to find root dir");
728 else {
729 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
730 root->i_atime.tv_nsec = 0;
731 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
732 root->i_mtime.tv_nsec = 0;
733 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
734 root->i_ctime.tv_nsec = 0;
735 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
736 hpfs_i(root)->i_parent_dir = root->i_ino;
737 if (root->i_size == -1)
738 root->i_size = 2048;
739 if (root->i_blocks == -1)
740 root->i_blocks = 5;
741 hpfs_brelse4(&qbh);
742 }
743 hpfs_unlock(s);
744 return 0;
745
746bail4: brelse(bh2);
747bail3: brelse(bh1);
748bail2: brelse(bh0);
749bail1:
750bail0:
751 hpfs_unlock(s);
752 free_sbi(sbi);
753 return -EINVAL;
754}
755
756static struct dentry *hpfs_mount(struct file_system_type *fs_type,
757 int flags, const char *dev_name, void *data)
758{
759 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
760}
761
762static struct file_system_type hpfs_fs_type = {
763 .owner = THIS_MODULE,
764 .name = "hpfs",
765 .mount = hpfs_mount,
766 .kill_sb = kill_block_super,
767 .fs_flags = FS_REQUIRES_DEV,
768};
769MODULE_ALIAS_FS("hpfs");
770
771static int __init init_hpfs_fs(void)
772{
773 int err = init_inodecache();
774 if (err)
775 goto out1;
776 err = register_filesystem(&hpfs_fs_type);
777 if (err)
778 goto out;
779 return 0;
780out:
781 destroy_inodecache();
782out1:
783 return err;
784}
785
786static void __exit exit_hpfs_fs(void)
787{
788 unregister_filesystem(&hpfs_fs_type);
789 destroy_inodecache();
790}
791
792module_init(init_hpfs_fs)
793module_exit(exit_hpfs_fs)
794MODULE_LICENSE("GPL");
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
19/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
20
21static void mark_dirty(struct super_block *s, int remount)
22{
23 if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) {
24 struct buffer_head *bh;
25 struct hpfs_spare_block *sb;
26 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
27 sb->dirty = 1;
28 sb->old_wrote = 0;
29 mark_buffer_dirty(bh);
30 sync_dirty_buffer(bh);
31 brelse(bh);
32 }
33 }
34}
35
36/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
37 were errors) */
38
39static void unmark_dirty(struct super_block *s)
40{
41 struct buffer_head *bh;
42 struct hpfs_spare_block *sb;
43 if (s->s_flags & MS_RDONLY) return;
44 sync_blockdev(s->s_bdev);
45 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
46 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
47 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
48 mark_buffer_dirty(bh);
49 sync_dirty_buffer(bh);
50 brelse(bh);
51 }
52}
53
54/* Filesystem error... */
55static char err_buf[1024];
56
57void hpfs_error(struct super_block *s, const char *fmt, ...)
58{
59 va_list args;
60
61 va_start(args, fmt);
62 vsnprintf(err_buf, sizeof(err_buf), fmt, args);
63 va_end(args);
64
65 printk("HPFS: filesystem error: %s", err_buf);
66 if (!hpfs_sb(s)->sb_was_error) {
67 if (hpfs_sb(s)->sb_err == 2) {
68 printk("; crashing the system because you wanted it\n");
69 mark_dirty(s, 0);
70 panic("HPFS panic");
71 } else if (hpfs_sb(s)->sb_err == 1) {
72 if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
73 else {
74 printk("; remounting read-only\n");
75 mark_dirty(s, 0);
76 s->s_flags |= MS_RDONLY;
77 }
78 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
79 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
80 } else printk("\n");
81 hpfs_sb(s)->sb_was_error = 1;
82}
83
84/*
85 * A little trick to detect cycles in many hpfs structures and don't let the
86 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
87 *
88 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
89 * nested each in other, chkdsk locked up happilly.
90 */
91
92int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
93 char *msg)
94{
95 if (*c2 && *c1 == key) {
96 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
97 return 1;
98 }
99 (*c2)++;
100 if (!((*c2 - 1) & *c2)) *c1 = key;
101 return 0;
102}
103
104static void free_sbi(struct hpfs_sb_info *sbi)
105{
106 kfree(sbi->sb_cp_table);
107 kfree(sbi->sb_bmp_dir);
108 kfree(sbi);
109}
110
111static void lazy_free_sbi(struct rcu_head *rcu)
112{
113 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
114}
115
116static void hpfs_put_super(struct super_block *s)
117{
118 hpfs_lock(s);
119 unmark_dirty(s);
120 hpfs_unlock(s);
121 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
122}
123
124static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
125{
126 struct quad_buffer_head qbh;
127 unsigned long *bits;
128 unsigned count;
129
130 bits = hpfs_map_4sectors(s, secno, &qbh, 0);
131 if (!bits)
132 return (unsigned)-1;
133 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
134 hpfs_brelse4(&qbh);
135 return count;
136}
137
138static unsigned count_bitmaps(struct super_block *s)
139{
140 unsigned n, count, n_bands;
141 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
142 count = 0;
143 for (n = 0; n < COUNT_RD_AHEAD; n++) {
144 hpfs_prefetch_bitmap(s, n);
145 }
146 for (n = 0; n < n_bands; n++) {
147 unsigned c;
148 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
149 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
150 if (c != (unsigned)-1)
151 count += c;
152 }
153 return count;
154}
155
156unsigned hpfs_get_free_dnodes(struct super_block *s)
157{
158 struct hpfs_sb_info *sbi = hpfs_sb(s);
159 if (sbi->sb_n_free_dnodes == (unsigned)-1) {
160 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
161 if (c == (unsigned)-1)
162 return 0;
163 sbi->sb_n_free_dnodes = c;
164 }
165 return sbi->sb_n_free_dnodes;
166}
167
168static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
169{
170 struct super_block *s = dentry->d_sb;
171 struct hpfs_sb_info *sbi = hpfs_sb(s);
172 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
173
174 hpfs_lock(s);
175
176 if (sbi->sb_n_free == (unsigned)-1)
177 sbi->sb_n_free = count_bitmaps(s);
178
179 buf->f_type = s->s_magic;
180 buf->f_bsize = 512;
181 buf->f_blocks = sbi->sb_fs_size;
182 buf->f_bfree = sbi->sb_n_free;
183 buf->f_bavail = sbi->sb_n_free;
184 buf->f_files = sbi->sb_dirband_size / 4;
185 buf->f_ffree = hpfs_get_free_dnodes(s);
186 buf->f_fsid.val[0] = (u32)id;
187 buf->f_fsid.val[1] = (u32)(id >> 32);
188 buf->f_namelen = 254;
189
190 hpfs_unlock(s);
191
192 return 0;
193}
194
195static struct kmem_cache * hpfs_inode_cachep;
196
197static struct inode *hpfs_alloc_inode(struct super_block *sb)
198{
199 struct hpfs_inode_info *ei;
200 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
201 if (!ei)
202 return NULL;
203 ei->vfs_inode.i_version = 1;
204 return &ei->vfs_inode;
205}
206
207static void hpfs_i_callback(struct rcu_head *head)
208{
209 struct inode *inode = container_of(head, struct inode, i_rcu);
210 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
211}
212
213static void hpfs_destroy_inode(struct inode *inode)
214{
215 call_rcu(&inode->i_rcu, hpfs_i_callback);
216}
217
218static void init_once(void *foo)
219{
220 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
221
222 inode_init_once(&ei->vfs_inode);
223}
224
225static int init_inodecache(void)
226{
227 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
228 sizeof(struct hpfs_inode_info),
229 0, (SLAB_RECLAIM_ACCOUNT|
230 SLAB_MEM_SPREAD),
231 init_once);
232 if (hpfs_inode_cachep == NULL)
233 return -ENOMEM;
234 return 0;
235}
236
237static void destroy_inodecache(void)
238{
239 /*
240 * Make sure all delayed rcu free inodes are flushed before we
241 * destroy cache.
242 */
243 rcu_barrier();
244 kmem_cache_destroy(hpfs_inode_cachep);
245}
246
247/*
248 * A tiny parser for option strings, stolen from dosfs.
249 * Stolen again from read-only hpfs.
250 * And updated for table-driven option parsing.
251 */
252
253enum {
254 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
255 Opt_check_none, Opt_check_normal, Opt_check_strict,
256 Opt_err_cont, Opt_err_ro, Opt_err_panic,
257 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
258 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
259 Opt_timeshift, Opt_err,
260};
261
262static const match_table_t tokens = {
263 {Opt_help, "help"},
264 {Opt_uid, "uid=%u"},
265 {Opt_gid, "gid=%u"},
266 {Opt_umask, "umask=%o"},
267 {Opt_case_lower, "case=lower"},
268 {Opt_case_asis, "case=asis"},
269 {Opt_check_none, "check=none"},
270 {Opt_check_normal, "check=normal"},
271 {Opt_check_strict, "check=strict"},
272 {Opt_err_cont, "errors=continue"},
273 {Opt_err_ro, "errors=remount-ro"},
274 {Opt_err_panic, "errors=panic"},
275 {Opt_eas_no, "eas=no"},
276 {Opt_eas_ro, "eas=ro"},
277 {Opt_eas_rw, "eas=rw"},
278 {Opt_chkdsk_no, "chkdsk=no"},
279 {Opt_chkdsk_errors, "chkdsk=errors"},
280 {Opt_chkdsk_always, "chkdsk=always"},
281 {Opt_timeshift, "timeshift=%d"},
282 {Opt_err, NULL},
283};
284
285static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
286 int *lowercase, int *eas, int *chk, int *errs,
287 int *chkdsk, int *timeshift)
288{
289 char *p;
290 int option;
291
292 if (!opts)
293 return 1;
294
295 /*printk("Parsing opts: '%s'\n",opts);*/
296
297 while ((p = strsep(&opts, ",")) != NULL) {
298 substring_t args[MAX_OPT_ARGS];
299 int token;
300 if (!*p)
301 continue;
302
303 token = match_token(p, tokens, args);
304 switch (token) {
305 case Opt_help:
306 return 2;
307 case Opt_uid:
308 if (match_int(args, &option))
309 return 0;
310 *uid = make_kuid(current_user_ns(), option);
311 if (!uid_valid(*uid))
312 return 0;
313 break;
314 case Opt_gid:
315 if (match_int(args, &option))
316 return 0;
317 *gid = make_kgid(current_user_ns(), option);
318 if (!gid_valid(*gid))
319 return 0;
320 break;
321 case Opt_umask:
322 if (match_octal(args, &option))
323 return 0;
324 *umask = option;
325 break;
326 case Opt_case_lower:
327 *lowercase = 1;
328 break;
329 case Opt_case_asis:
330 *lowercase = 0;
331 break;
332 case Opt_check_none:
333 *chk = 0;
334 break;
335 case Opt_check_normal:
336 *chk = 1;
337 break;
338 case Opt_check_strict:
339 *chk = 2;
340 break;
341 case Opt_err_cont:
342 *errs = 0;
343 break;
344 case Opt_err_ro:
345 *errs = 1;
346 break;
347 case Opt_err_panic:
348 *errs = 2;
349 break;
350 case Opt_eas_no:
351 *eas = 0;
352 break;
353 case Opt_eas_ro:
354 *eas = 1;
355 break;
356 case Opt_eas_rw:
357 *eas = 2;
358 break;
359 case Opt_chkdsk_no:
360 *chkdsk = 0;
361 break;
362 case Opt_chkdsk_errors:
363 *chkdsk = 1;
364 break;
365 case Opt_chkdsk_always:
366 *chkdsk = 2;
367 break;
368 case Opt_timeshift:
369 {
370 int m = 1;
371 char *rhs = args[0].from;
372 if (!rhs || !*rhs)
373 return 0;
374 if (*rhs == '-') m = -1;
375 if (*rhs == '+' || *rhs == '-') rhs++;
376 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
377 if (*rhs)
378 return 0;
379 break;
380 }
381 default:
382 return 0;
383 }
384 }
385 return 1;
386}
387
388static inline void hpfs_help(void)
389{
390 printk("\n\
391HPFS filesystem options:\n\
392 help do not mount and display this text\n\
393 uid=xxx set uid of files that don't have uid specified in eas\n\
394 gid=xxx set gid of files that don't have gid specified in eas\n\
395 umask=xxx set mode of files that don't have mode specified in eas\n\
396 case=lower lowercase all files\n\
397 case=asis do not lowercase files (default)\n\
398 check=none no fs checks - kernel may crash on corrupted filesystem\n\
399 check=normal do some checks - it should not crash (default)\n\
400 check=strict do extra time-consuming checks, used for debugging\n\
401 errors=continue continue on errors\n\
402 errors=remount-ro remount read-only if errors found (default)\n\
403 errors=panic panic on errors\n\
404 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
405 chkdsk=errors mark fs dirty if errors found (default)\n\
406 chkdsk=always always mark fs dirty - used for debugging\n\
407 eas=no ignore extended attributes\n\
408 eas=ro read but do not write extended attributes\n\
409 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
410 timeshift=nnn add nnn seconds to file times\n\
411\n");
412}
413
414static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
415{
416 kuid_t uid;
417 kgid_t gid;
418 umode_t umask;
419 int lowercase, eas, chk, errs, chkdsk, timeshift;
420 int o;
421 struct hpfs_sb_info *sbi = hpfs_sb(s);
422 char *new_opts = kstrdup(data, GFP_KERNEL);
423
424 sync_filesystem(s);
425
426 *flags |= MS_NOATIME;
427
428 hpfs_lock(s);
429 uid = sbi->sb_uid; gid = sbi->sb_gid;
430 umask = 0777 & ~sbi->sb_mode;
431 lowercase = sbi->sb_lowercase;
432 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
433 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
434
435 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
436 &eas, &chk, &errs, &chkdsk, ×hift))) {
437 printk("HPFS: bad mount options.\n");
438 goto out_err;
439 }
440 if (o == 2) {
441 hpfs_help();
442 goto out_err;
443 }
444 if (timeshift != sbi->sb_timeshift) {
445 printk("HPFS: timeshift can't be changed using remount.\n");
446 goto out_err;
447 }
448
449 unmark_dirty(s);
450
451 sbi->sb_uid = uid; sbi->sb_gid = gid;
452 sbi->sb_mode = 0777 & ~umask;
453 sbi->sb_lowercase = lowercase;
454 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
455 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
456
457 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
458
459 replace_mount_options(s, new_opts);
460
461 hpfs_unlock(s);
462 return 0;
463
464out_err:
465 hpfs_unlock(s);
466 kfree(new_opts);
467 return -EINVAL;
468}
469
470/* Super operations */
471
472static const struct super_operations hpfs_sops =
473{
474 .alloc_inode = hpfs_alloc_inode,
475 .destroy_inode = hpfs_destroy_inode,
476 .evict_inode = hpfs_evict_inode,
477 .put_super = hpfs_put_super,
478 .statfs = hpfs_statfs,
479 .remount_fs = hpfs_remount_fs,
480 .show_options = generic_show_options,
481};
482
483static int hpfs_fill_super(struct super_block *s, void *options, int silent)
484{
485 struct buffer_head *bh0, *bh1, *bh2;
486 struct hpfs_boot_block *bootblock;
487 struct hpfs_super_block *superblock;
488 struct hpfs_spare_block *spareblock;
489 struct hpfs_sb_info *sbi;
490 struct inode *root;
491
492 kuid_t uid;
493 kgid_t gid;
494 umode_t umask;
495 int lowercase, eas, chk, errs, chkdsk, timeshift;
496
497 dnode_secno root_dno;
498 struct hpfs_dirent *de = NULL;
499 struct quad_buffer_head qbh;
500
501 int o;
502
503 save_mount_options(s, options);
504
505 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
506 if (!sbi) {
507 return -ENOMEM;
508 }
509 s->s_fs_info = sbi;
510
511 mutex_init(&sbi->hpfs_mutex);
512 hpfs_lock(s);
513
514 uid = current_uid();
515 gid = current_gid();
516 umask = current_umask();
517 lowercase = 0;
518 eas = 2;
519 chk = 1;
520 errs = 1;
521 chkdsk = 1;
522 timeshift = 0;
523
524 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
525 &eas, &chk, &errs, &chkdsk, ×hift))) {
526 printk("HPFS: bad mount options.\n");
527 goto bail0;
528 }
529 if (o==2) {
530 hpfs_help();
531 goto bail0;
532 }
533
534 /*sbi->sb_mounting = 1;*/
535 sb_set_blocksize(s, 512);
536 sbi->sb_fs_size = -1;
537 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
538 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
539 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
540
541 /* Check magics */
542 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
543 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
544 || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
545 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
546 goto bail4;
547 }
548
549 /* Check version */
550 if (!(s->s_flags & MS_RDONLY) &&
551 superblock->funcversion != 2 && superblock->funcversion != 3) {
552 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
553 (int)superblock->version, (int)superblock->funcversion);
554 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");
555 goto bail4;
556 }
557
558 s->s_flags |= MS_NOATIME;
559
560 /* Fill superblock stuff */
561 s->s_magic = HPFS_SUPER_MAGIC;
562 s->s_op = &hpfs_sops;
563 s->s_d_op = &hpfs_dentry_operations;
564
565 sbi->sb_root = le32_to_cpu(superblock->root);
566 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
567 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
568 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
569 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
570 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
571 sbi->sb_uid = uid;
572 sbi->sb_gid = gid;
573 sbi->sb_mode = 0777 & ~umask;
574 sbi->sb_n_free = -1;
575 sbi->sb_n_free_dnodes = -1;
576 sbi->sb_lowercase = lowercase;
577 sbi->sb_eas = eas;
578 sbi->sb_chk = chk;
579 sbi->sb_chkdsk = chkdsk;
580 sbi->sb_err = errs;
581 sbi->sb_timeshift = timeshift;
582 sbi->sb_was_error = 0;
583 sbi->sb_cp_table = NULL;
584 sbi->sb_c_bitmap = -1;
585 sbi->sb_max_fwd_alloc = 0xffffff;
586
587 if (sbi->sb_fs_size >= 0x80000000) {
588 hpfs_error(s, "invalid size in superblock: %08x",
589 (unsigned)sbi->sb_fs_size);
590 goto bail4;
591 }
592
593 /* Load bitmap directory */
594 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
595 goto bail4;
596
597 /* Check for general fs errors*/
598 if (spareblock->dirty && !spareblock->old_wrote) {
599 if (errs == 2) {
600 printk("HPFS: Improperly stopped, not mounted\n");
601 goto bail4;
602 }
603 hpfs_error(s, "improperly stopped");
604 }
605
606 if (!(s->s_flags & MS_RDONLY)) {
607 spareblock->dirty = 1;
608 spareblock->old_wrote = 0;
609 mark_buffer_dirty(bh2);
610 }
611
612 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
613 if (errs >= 2) {
614 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
615 mark_dirty(s, 0);
616 goto bail4;
617 }
618 hpfs_error(s, "hotfixes not supported here, try chkdsk");
619 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
620 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
621 }
622 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
623 if (errs >= 2) {
624 printk("HPFS: Spare dnodes used, try chkdsk\n");
625 mark_dirty(s, 0);
626 goto bail4;
627 }
628 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
629 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
630 }
631 if (chk) {
632 unsigned a;
633 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
634 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
635 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
636 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
637 goto bail4;
638 }
639 a = sbi->sb_dirband_size;
640 sbi->sb_dirband_size = 0;
641 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
642 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
643 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
644 mark_dirty(s, 0);
645 goto bail4;
646 }
647 sbi->sb_dirband_size = a;
648 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
649
650 /* Load code page table */
651 if (le32_to_cpu(spareblock->n_code_pages))
652 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
653 printk("HPFS: Warning: code page support is disabled\n");
654
655 brelse(bh2);
656 brelse(bh1);
657 brelse(bh0);
658
659 root = iget_locked(s, sbi->sb_root);
660 if (!root)
661 goto bail0;
662 hpfs_init_inode(root);
663 hpfs_read_inode(root);
664 unlock_new_inode(root);
665 s->s_root = d_make_root(root);
666 if (!s->s_root)
667 goto bail0;
668
669 /*
670 * find the root directory's . pointer & finish filling in the inode
671 */
672
673 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
674 if (root_dno)
675 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
676 if (!de)
677 hpfs_error(s, "unable to find root dir");
678 else {
679 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
680 root->i_atime.tv_nsec = 0;
681 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
682 root->i_mtime.tv_nsec = 0;
683 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
684 root->i_ctime.tv_nsec = 0;
685 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
686 hpfs_i(root)->i_parent_dir = root->i_ino;
687 if (root->i_size == -1)
688 root->i_size = 2048;
689 if (root->i_blocks == -1)
690 root->i_blocks = 5;
691 hpfs_brelse4(&qbh);
692 }
693 hpfs_unlock(s);
694 return 0;
695
696bail4: brelse(bh2);
697bail3: brelse(bh1);
698bail2: brelse(bh0);
699bail1:
700bail0:
701 hpfs_unlock(s);
702 free_sbi(sbi);
703 return -EINVAL;
704}
705
706static struct dentry *hpfs_mount(struct file_system_type *fs_type,
707 int flags, const char *dev_name, void *data)
708{
709 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
710}
711
712static struct file_system_type hpfs_fs_type = {
713 .owner = THIS_MODULE,
714 .name = "hpfs",
715 .mount = hpfs_mount,
716 .kill_sb = kill_block_super,
717 .fs_flags = FS_REQUIRES_DEV,
718};
719MODULE_ALIAS_FS("hpfs");
720
721static int __init init_hpfs_fs(void)
722{
723 int err = init_inodecache();
724 if (err)
725 goto out1;
726 err = register_filesystem(&hpfs_fs_type);
727 if (err)
728 goto out;
729 return 0;
730out:
731 destroy_inodecache();
732out1:
733 return err;
734}
735
736static void __exit exit_hpfs_fs(void)
737{
738 unregister_filesystem(&hpfs_fs_type);
739 destroy_inodecache();
740}
741
742module_init(init_hpfs_fs)
743module_exit(exit_hpfs_fs)
744MODULE_LICENSE("GPL");