Loading...
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 hpfs_put_super(struct super_block *s)
105{
106 struct hpfs_sb_info *sbi = hpfs_sb(s);
107
108 hpfs_lock(s);
109 unmark_dirty(s);
110 hpfs_unlock(s);
111
112 kfree(sbi->sb_cp_table);
113 kfree(sbi->sb_bmp_dir);
114 s->s_fs_info = NULL;
115 kfree(sbi);
116}
117
118unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
119{
120 struct quad_buffer_head qbh;
121 unsigned long *bits;
122 unsigned count;
123
124 bits = hpfs_map_4sectors(s, secno, &qbh, 4);
125 if (!bits)
126 return 0;
127 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
128 hpfs_brelse4(&qbh);
129 return count;
130}
131
132static unsigned count_bitmaps(struct super_block *s)
133{
134 unsigned n, count, n_bands;
135 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
136 count = 0;
137 for (n = 0; n < n_bands; n++)
138 count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
139 return count;
140}
141
142static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
143{
144 struct super_block *s = dentry->d_sb;
145 struct hpfs_sb_info *sbi = hpfs_sb(s);
146 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
147 hpfs_lock(s);
148
149 /*if (sbi->sb_n_free == -1) {*/
150 sbi->sb_n_free = count_bitmaps(s);
151 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
152 /*}*/
153 buf->f_type = s->s_magic;
154 buf->f_bsize = 512;
155 buf->f_blocks = sbi->sb_fs_size;
156 buf->f_bfree = sbi->sb_n_free;
157 buf->f_bavail = sbi->sb_n_free;
158 buf->f_files = sbi->sb_dirband_size / 4;
159 buf->f_ffree = sbi->sb_n_free_dnodes;
160 buf->f_fsid.val[0] = (u32)id;
161 buf->f_fsid.val[1] = (u32)(id >> 32);
162 buf->f_namelen = 254;
163
164 hpfs_unlock(s);
165
166 return 0;
167}
168
169static struct kmem_cache * hpfs_inode_cachep;
170
171static struct inode *hpfs_alloc_inode(struct super_block *sb)
172{
173 struct hpfs_inode_info *ei;
174 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
175 if (!ei)
176 return NULL;
177 ei->vfs_inode.i_version = 1;
178 return &ei->vfs_inode;
179}
180
181static void hpfs_i_callback(struct rcu_head *head)
182{
183 struct inode *inode = container_of(head, struct inode, i_rcu);
184 INIT_LIST_HEAD(&inode->i_dentry);
185 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
186}
187
188static void hpfs_destroy_inode(struct inode *inode)
189{
190 call_rcu(&inode->i_rcu, hpfs_i_callback);
191}
192
193static void init_once(void *foo)
194{
195 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
196
197 inode_init_once(&ei->vfs_inode);
198}
199
200static int init_inodecache(void)
201{
202 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
203 sizeof(struct hpfs_inode_info),
204 0, (SLAB_RECLAIM_ACCOUNT|
205 SLAB_MEM_SPREAD),
206 init_once);
207 if (hpfs_inode_cachep == NULL)
208 return -ENOMEM;
209 return 0;
210}
211
212static void destroy_inodecache(void)
213{
214 kmem_cache_destroy(hpfs_inode_cachep);
215}
216
217/*
218 * A tiny parser for option strings, stolen from dosfs.
219 * Stolen again from read-only hpfs.
220 * And updated for table-driven option parsing.
221 */
222
223enum {
224 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
225 Opt_check_none, Opt_check_normal, Opt_check_strict,
226 Opt_err_cont, Opt_err_ro, Opt_err_panic,
227 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
228 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
229 Opt_timeshift, Opt_err,
230};
231
232static const match_table_t tokens = {
233 {Opt_help, "help"},
234 {Opt_uid, "uid=%u"},
235 {Opt_gid, "gid=%u"},
236 {Opt_umask, "umask=%o"},
237 {Opt_case_lower, "case=lower"},
238 {Opt_case_asis, "case=asis"},
239 {Opt_check_none, "check=none"},
240 {Opt_check_normal, "check=normal"},
241 {Opt_check_strict, "check=strict"},
242 {Opt_err_cont, "errors=continue"},
243 {Opt_err_ro, "errors=remount-ro"},
244 {Opt_err_panic, "errors=panic"},
245 {Opt_eas_no, "eas=no"},
246 {Opt_eas_ro, "eas=ro"},
247 {Opt_eas_rw, "eas=rw"},
248 {Opt_chkdsk_no, "chkdsk=no"},
249 {Opt_chkdsk_errors, "chkdsk=errors"},
250 {Opt_chkdsk_always, "chkdsk=always"},
251 {Opt_timeshift, "timeshift=%d"},
252 {Opt_err, NULL},
253};
254
255static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
256 int *lowercase, int *eas, int *chk, int *errs,
257 int *chkdsk, int *timeshift)
258{
259 char *p;
260 int option;
261
262 if (!opts)
263 return 1;
264
265 /*printk("Parsing opts: '%s'\n",opts);*/
266
267 while ((p = strsep(&opts, ",")) != NULL) {
268 substring_t args[MAX_OPT_ARGS];
269 int token;
270 if (!*p)
271 continue;
272
273 token = match_token(p, tokens, args);
274 switch (token) {
275 case Opt_help:
276 return 2;
277 case Opt_uid:
278 if (match_int(args, &option))
279 return 0;
280 *uid = option;
281 break;
282 case Opt_gid:
283 if (match_int(args, &option))
284 return 0;
285 *gid = option;
286 break;
287 case Opt_umask:
288 if (match_octal(args, &option))
289 return 0;
290 *umask = option;
291 break;
292 case Opt_case_lower:
293 *lowercase = 1;
294 break;
295 case Opt_case_asis:
296 *lowercase = 0;
297 break;
298 case Opt_check_none:
299 *chk = 0;
300 break;
301 case Opt_check_normal:
302 *chk = 1;
303 break;
304 case Opt_check_strict:
305 *chk = 2;
306 break;
307 case Opt_err_cont:
308 *errs = 0;
309 break;
310 case Opt_err_ro:
311 *errs = 1;
312 break;
313 case Opt_err_panic:
314 *errs = 2;
315 break;
316 case Opt_eas_no:
317 *eas = 0;
318 break;
319 case Opt_eas_ro:
320 *eas = 1;
321 break;
322 case Opt_eas_rw:
323 *eas = 2;
324 break;
325 case Opt_chkdsk_no:
326 *chkdsk = 0;
327 break;
328 case Opt_chkdsk_errors:
329 *chkdsk = 1;
330 break;
331 case Opt_chkdsk_always:
332 *chkdsk = 2;
333 break;
334 case Opt_timeshift:
335 {
336 int m = 1;
337 char *rhs = args[0].from;
338 if (!rhs || !*rhs)
339 return 0;
340 if (*rhs == '-') m = -1;
341 if (*rhs == '+' || *rhs == '-') rhs++;
342 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
343 if (*rhs)
344 return 0;
345 break;
346 }
347 default:
348 return 0;
349 }
350 }
351 return 1;
352}
353
354static inline void hpfs_help(void)
355{
356 printk("\n\
357HPFS filesystem options:\n\
358 help do not mount and display this text\n\
359 uid=xxx set uid of files that don't have uid specified in eas\n\
360 gid=xxx set gid of files that don't have gid specified in eas\n\
361 umask=xxx set mode of files that don't have mode specified in eas\n\
362 case=lower lowercase all files\n\
363 case=asis do not lowercase files (default)\n\
364 check=none no fs checks - kernel may crash on corrupted filesystem\n\
365 check=normal do some checks - it should not crash (default)\n\
366 check=strict do extra time-consuming checks, used for debugging\n\
367 errors=continue continue on errors\n\
368 errors=remount-ro remount read-only if errors found (default)\n\
369 errors=panic panic on errors\n\
370 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
371 chkdsk=errors mark fs dirty if errors found (default)\n\
372 chkdsk=always always mark fs dirty - used for debugging\n\
373 eas=no ignore extended attributes\n\
374 eas=ro read but do not write extended attributes\n\
375 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
376 timeshift=nnn add nnn seconds to file times\n\
377\n");
378}
379
380static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
381{
382 uid_t uid;
383 gid_t gid;
384 umode_t umask;
385 int lowercase, eas, chk, errs, chkdsk, timeshift;
386 int o;
387 struct hpfs_sb_info *sbi = hpfs_sb(s);
388 char *new_opts = kstrdup(data, GFP_KERNEL);
389
390 *flags |= MS_NOATIME;
391
392 hpfs_lock(s);
393 lock_super(s);
394 uid = sbi->sb_uid; gid = sbi->sb_gid;
395 umask = 0777 & ~sbi->sb_mode;
396 lowercase = sbi->sb_lowercase;
397 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
398 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
399
400 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
401 &eas, &chk, &errs, &chkdsk, ×hift))) {
402 printk("HPFS: bad mount options.\n");
403 goto out_err;
404 }
405 if (o == 2) {
406 hpfs_help();
407 goto out_err;
408 }
409 if (timeshift != sbi->sb_timeshift) {
410 printk("HPFS: timeshift can't be changed using remount.\n");
411 goto out_err;
412 }
413
414 unmark_dirty(s);
415
416 sbi->sb_uid = uid; sbi->sb_gid = gid;
417 sbi->sb_mode = 0777 & ~umask;
418 sbi->sb_lowercase = lowercase;
419 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
420 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
421
422 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
423
424 replace_mount_options(s, new_opts);
425
426 unlock_super(s);
427 hpfs_unlock(s);
428 return 0;
429
430out_err:
431 unlock_super(s);
432 hpfs_unlock(s);
433 kfree(new_opts);
434 return -EINVAL;
435}
436
437/* Super operations */
438
439static const struct super_operations hpfs_sops =
440{
441 .alloc_inode = hpfs_alloc_inode,
442 .destroy_inode = hpfs_destroy_inode,
443 .evict_inode = hpfs_evict_inode,
444 .put_super = hpfs_put_super,
445 .statfs = hpfs_statfs,
446 .remount_fs = hpfs_remount_fs,
447 .show_options = generic_show_options,
448};
449
450static int hpfs_fill_super(struct super_block *s, void *options, int silent)
451{
452 struct buffer_head *bh0, *bh1, *bh2;
453 struct hpfs_boot_block *bootblock;
454 struct hpfs_super_block *superblock;
455 struct hpfs_spare_block *spareblock;
456 struct hpfs_sb_info *sbi;
457 struct inode *root;
458
459 uid_t uid;
460 gid_t gid;
461 umode_t umask;
462 int lowercase, eas, chk, errs, chkdsk, timeshift;
463
464 dnode_secno root_dno;
465 struct hpfs_dirent *de = NULL;
466 struct quad_buffer_head qbh;
467
468 int o;
469
470 save_mount_options(s, options);
471
472 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
473 if (!sbi) {
474 return -ENOMEM;
475 }
476 s->s_fs_info = sbi;
477
478 sbi->sb_bmp_dir = NULL;
479 sbi->sb_cp_table = NULL;
480
481 mutex_init(&sbi->hpfs_mutex);
482 hpfs_lock(s);
483
484 uid = current_uid();
485 gid = current_gid();
486 umask = current_umask();
487 lowercase = 0;
488 eas = 2;
489 chk = 1;
490 errs = 1;
491 chkdsk = 1;
492 timeshift = 0;
493
494 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
495 &eas, &chk, &errs, &chkdsk, ×hift))) {
496 printk("HPFS: bad mount options.\n");
497 goto bail0;
498 }
499 if (o==2) {
500 hpfs_help();
501 goto bail0;
502 }
503
504 /*sbi->sb_mounting = 1;*/
505 sb_set_blocksize(s, 512);
506 sbi->sb_fs_size = -1;
507 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
508 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
509 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
510
511 /* Check magics */
512 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
513 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
514 || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
515 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
516 goto bail4;
517 }
518
519 /* Check version */
520 if (!(s->s_flags & MS_RDONLY) &&
521 superblock->funcversion != 2 && superblock->funcversion != 3) {
522 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
523 (int)superblock->version, (int)superblock->funcversion);
524 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");
525 goto bail4;
526 }
527
528 s->s_flags |= MS_NOATIME;
529
530 /* Fill superblock stuff */
531 s->s_magic = HPFS_SUPER_MAGIC;
532 s->s_op = &hpfs_sops;
533 s->s_d_op = &hpfs_dentry_operations;
534
535 sbi->sb_root = le32_to_cpu(superblock->root);
536 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
537 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
538 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
539 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
540 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
541 sbi->sb_uid = uid;
542 sbi->sb_gid = gid;
543 sbi->sb_mode = 0777 & ~umask;
544 sbi->sb_n_free = -1;
545 sbi->sb_n_free_dnodes = -1;
546 sbi->sb_lowercase = lowercase;
547 sbi->sb_eas = eas;
548 sbi->sb_chk = chk;
549 sbi->sb_chkdsk = chkdsk;
550 sbi->sb_err = errs;
551 sbi->sb_timeshift = timeshift;
552 sbi->sb_was_error = 0;
553 sbi->sb_cp_table = NULL;
554 sbi->sb_c_bitmap = -1;
555 sbi->sb_max_fwd_alloc = 0xffffff;
556
557 /* Load bitmap directory */
558 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
559 goto bail4;
560
561 /* Check for general fs errors*/
562 if (spareblock->dirty && !spareblock->old_wrote) {
563 if (errs == 2) {
564 printk("HPFS: Improperly stopped, not mounted\n");
565 goto bail4;
566 }
567 hpfs_error(s, "improperly stopped");
568 }
569
570 if (!(s->s_flags & MS_RDONLY)) {
571 spareblock->dirty = 1;
572 spareblock->old_wrote = 0;
573 mark_buffer_dirty(bh2);
574 }
575
576 if (le32_to_cpu(spareblock->hotfixes_used) || le32_to_cpu(spareblock->n_spares_used)) {
577 if (errs >= 2) {
578 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
579 mark_dirty(s, 0);
580 goto bail4;
581 }
582 hpfs_error(s, "hotfixes not supported here, try chkdsk");
583 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
584 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
585 }
586 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
587 if (errs >= 2) {
588 printk("HPFS: Spare dnodes used, try chkdsk\n");
589 mark_dirty(s, 0);
590 goto bail4;
591 }
592 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
593 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
594 }
595 if (chk) {
596 unsigned a;
597 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
598 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
599 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
600 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
601 goto bail4;
602 }
603 a = sbi->sb_dirband_size;
604 sbi->sb_dirband_size = 0;
605 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
606 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
607 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
608 mark_dirty(s, 0);
609 goto bail4;
610 }
611 sbi->sb_dirband_size = a;
612 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
613
614 /* Load code page table */
615 if (le32_to_cpu(spareblock->n_code_pages))
616 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
617 printk("HPFS: Warning: code page support is disabled\n");
618
619 brelse(bh2);
620 brelse(bh1);
621 brelse(bh0);
622
623 root = iget_locked(s, sbi->sb_root);
624 if (!root)
625 goto bail0;
626 hpfs_init_inode(root);
627 hpfs_read_inode(root);
628 unlock_new_inode(root);
629 s->s_root = d_alloc_root(root);
630 if (!s->s_root) {
631 iput(root);
632 goto bail0;
633 }
634
635 /*
636 * find the root directory's . pointer & finish filling in the inode
637 */
638
639 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
640 if (root_dno)
641 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
642 if (!de)
643 hpfs_error(s, "unable to find root dir");
644 else {
645 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
646 root->i_atime.tv_nsec = 0;
647 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
648 root->i_mtime.tv_nsec = 0;
649 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
650 root->i_ctime.tv_nsec = 0;
651 hpfs_i(root)->i_ea_size = le16_to_cpu(de->ea_size);
652 hpfs_i(root)->i_parent_dir = root->i_ino;
653 if (root->i_size == -1)
654 root->i_size = 2048;
655 if (root->i_blocks == -1)
656 root->i_blocks = 5;
657 hpfs_brelse4(&qbh);
658 }
659 hpfs_unlock(s);
660 return 0;
661
662bail4: brelse(bh2);
663bail3: brelse(bh1);
664bail2: brelse(bh0);
665bail1:
666bail0:
667 hpfs_unlock(s);
668 kfree(sbi->sb_bmp_dir);
669 kfree(sbi->sb_cp_table);
670 s->s_fs_info = NULL;
671 kfree(sbi);
672 return -EINVAL;
673}
674
675static struct dentry *hpfs_mount(struct file_system_type *fs_type,
676 int flags, const char *dev_name, void *data)
677{
678 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
679}
680
681static struct file_system_type hpfs_fs_type = {
682 .owner = THIS_MODULE,
683 .name = "hpfs",
684 .mount = hpfs_mount,
685 .kill_sb = kill_block_super,
686 .fs_flags = FS_REQUIRES_DEV,
687};
688
689static int __init init_hpfs_fs(void)
690{
691 int err = init_inodecache();
692 if (err)
693 goto out1;
694 err = register_filesystem(&hpfs_fs_type);
695 if (err)
696 goto out;
697 return 0;
698out:
699 destroy_inodecache();
700out1:
701 return err;
702}
703
704static void __exit exit_hpfs_fs(void)
705{
706 unregister_filesystem(&hpfs_fs_type);
707 destroy_inodecache();
708}
709
710module_init(init_hpfs_fs)
711module_exit(exit_hpfs_fs)
712MODULE_LICENSE("GPL");
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/fs_context.h>
13#include <linux/fs_parser.h>
14#include <linux/init.h>
15#include <linux/statfs.h>
16#include <linux/magic.h>
17#include <linux/sched.h>
18#include <linux/bitmap.h>
19#include <linux/slab.h>
20#include <linux/seq_file.h>
21
22/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
23
24static void mark_dirty(struct super_block *s, int remount)
25{
26 if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) {
27 struct buffer_head *bh;
28 struct hpfs_spare_block *sb;
29 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
30 sb->dirty = 1;
31 sb->old_wrote = 0;
32 mark_buffer_dirty(bh);
33 sync_dirty_buffer(bh);
34 brelse(bh);
35 }
36 }
37}
38
39/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
40 were errors) */
41
42static void unmark_dirty(struct super_block *s)
43{
44 struct buffer_head *bh;
45 struct hpfs_spare_block *sb;
46 if (sb_rdonly(s)) return;
47 sync_blockdev(s->s_bdev);
48 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
49 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
50 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
51 mark_buffer_dirty(bh);
52 sync_dirty_buffer(bh);
53 brelse(bh);
54 }
55}
56
57/* Filesystem error... */
58void hpfs_error(struct super_block *s, const char *fmt, ...)
59{
60 struct va_format vaf;
61 va_list args;
62
63 va_start(args, fmt);
64
65 vaf.fmt = fmt;
66 vaf.va = &args;
67
68 pr_err("filesystem error: %pV", &vaf);
69
70 va_end(args);
71
72 if (!hpfs_sb(s)->sb_was_error) {
73 if (hpfs_sb(s)->sb_err == 2) {
74 pr_cont("; crashing the system because you wanted it\n");
75 mark_dirty(s, 0);
76 panic("HPFS panic");
77 } else if (hpfs_sb(s)->sb_err == 1) {
78 if (sb_rdonly(s))
79 pr_cont("; already mounted read-only\n");
80 else {
81 pr_cont("; remounting read-only\n");
82 mark_dirty(s, 0);
83 s->s_flags |= SB_RDONLY;
84 }
85 } else if (sb_rdonly(s))
86 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
87 else
88 pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
89 } else
90 pr_cont("\n");
91 hpfs_sb(s)->sb_was_error = 1;
92}
93
94/*
95 * A little trick to detect cycles in many hpfs structures and don't let the
96 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
97 *
98 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
99 * nested each in other, chkdsk locked up happilly.
100 */
101
102int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
103 char *msg)
104{
105 if (*c2 && *c1 == key) {
106 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
107 return 1;
108 }
109 (*c2)++;
110 if (!((*c2 - 1) & *c2)) *c1 = key;
111 return 0;
112}
113
114static void free_sbi(struct hpfs_sb_info *sbi)
115{
116 kfree(sbi->sb_cp_table);
117 kfree(sbi->sb_bmp_dir);
118 kfree(sbi);
119}
120
121static void lazy_free_sbi(struct rcu_head *rcu)
122{
123 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
124}
125
126static void hpfs_put_super(struct super_block *s)
127{
128 hpfs_lock(s);
129 unmark_dirty(s);
130 hpfs_unlock(s);
131 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
132}
133
134static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
135{
136 struct quad_buffer_head qbh;
137 unsigned long *bits;
138 unsigned count;
139
140 bits = hpfs_map_4sectors(s, secno, &qbh, 0);
141 if (!bits)
142 return (unsigned)-1;
143 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
144 hpfs_brelse4(&qbh);
145 return count;
146}
147
148static unsigned count_bitmaps(struct super_block *s)
149{
150 unsigned n, count, n_bands;
151 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
152 count = 0;
153 for (n = 0; n < COUNT_RD_AHEAD; n++) {
154 hpfs_prefetch_bitmap(s, n);
155 }
156 for (n = 0; n < n_bands; n++) {
157 unsigned c;
158 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
159 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
160 if (c != (unsigned)-1)
161 count += c;
162 }
163 return count;
164}
165
166unsigned hpfs_get_free_dnodes(struct super_block *s)
167{
168 struct hpfs_sb_info *sbi = hpfs_sb(s);
169 if (sbi->sb_n_free_dnodes == (unsigned)-1) {
170 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
171 if (c == (unsigned)-1)
172 return 0;
173 sbi->sb_n_free_dnodes = c;
174 }
175 return sbi->sb_n_free_dnodes;
176}
177
178static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
179{
180 struct super_block *s = dentry->d_sb;
181 struct hpfs_sb_info *sbi = hpfs_sb(s);
182 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
183
184 hpfs_lock(s);
185
186 if (sbi->sb_n_free == (unsigned)-1)
187 sbi->sb_n_free = count_bitmaps(s);
188
189 buf->f_type = s->s_magic;
190 buf->f_bsize = 512;
191 buf->f_blocks = sbi->sb_fs_size;
192 buf->f_bfree = sbi->sb_n_free;
193 buf->f_bavail = sbi->sb_n_free;
194 buf->f_files = sbi->sb_dirband_size / 4;
195 buf->f_ffree = hpfs_get_free_dnodes(s);
196 buf->f_fsid = u64_to_fsid(id);
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 = alloc_inode_sb(sb, 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_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
276enum {
277 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case,
278 Opt_check, Opt_err, Opt_eas, Opt_chkdsk, Opt_timeshift,
279};
280
281static const struct constant_table hpfs_param_case[] = {
282 {"asis", 0},
283 {"lower", 1},
284 {}
285};
286
287static const struct constant_table hpfs_param_check[] = {
288 {"none", 0},
289 {"normal", 1},
290 {"strict", 2},
291 {}
292};
293
294static const struct constant_table hpfs_param_err[] = {
295 {"continue", 0},
296 {"remount-ro", 1},
297 {"panic", 2},
298 {}
299};
300
301static const struct constant_table hpfs_param_eas[] = {
302 {"no", 0},
303 {"ro", 1},
304 {"rw", 2},
305 {}
306};
307
308static const struct constant_table hpfs_param_chkdsk[] = {
309 {"no", 0},
310 {"errors", 1},
311 {"always", 2},
312 {}
313};
314
315static const struct fs_parameter_spec hpfs_param_spec[] = {
316 fsparam_flag ("help", Opt_help),
317 fsparam_uid ("uid", Opt_uid),
318 fsparam_gid ("gid", Opt_gid),
319 fsparam_u32oct ("umask", Opt_umask),
320 fsparam_enum ("case", Opt_case, hpfs_param_case),
321 fsparam_enum ("check", Opt_check, hpfs_param_check),
322 fsparam_enum ("errors", Opt_err, hpfs_param_err),
323 fsparam_enum ("eas", Opt_eas, hpfs_param_eas),
324 fsparam_enum ("chkdsk", Opt_chkdsk, hpfs_param_chkdsk),
325 fsparam_s32 ("timeshift", Opt_timeshift),
326 {}
327};
328
329struct hpfs_fc_context {
330 kuid_t uid;
331 kgid_t gid;
332 umode_t umask;
333 int lowercase;
334 int eas;
335 int chk;
336 int errs;
337 int chkdsk;
338 int timeshift;
339};
340
341static inline void hpfs_help(void)
342{
343 pr_info("\n\
344HPFS filesystem options:\n\
345 help do not mount and display this text\n\
346 uid=xxx set uid of files that don't have uid specified in eas\n\
347 gid=xxx set gid of files that don't have gid specified in eas\n\
348 umask=xxx set mode of files that don't have mode specified in eas\n\
349 case=lower lowercase all files\n\
350 case=asis do not lowercase files (default)\n\
351 check=none no fs checks - kernel may crash on corrupted filesystem\n\
352 check=normal do some checks - it should not crash (default)\n\
353 check=strict do extra time-consuming checks, used for debugging\n\
354 errors=continue continue on errors\n\
355 errors=remount-ro remount read-only if errors found (default)\n\
356 errors=panic panic on errors\n\
357 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
358 chkdsk=errors mark fs dirty if errors found (default)\n\
359 chkdsk=always always mark fs dirty - used for debugging\n\
360 eas=no ignore extended attributes\n\
361 eas=ro read but do not write extended attributes\n\
362 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
363 timeshift=nnn add nnn seconds to file times\n\
364\n");
365}
366
367static int hpfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
368{
369 struct hpfs_fc_context *ctx = fc->fs_private;
370 struct fs_parse_result result;
371 int opt;
372
373 opt = fs_parse(fc, hpfs_param_spec, param, &result);
374 if (opt < 0)
375 return opt;
376
377 switch (opt) {
378 case Opt_help:
379 hpfs_help();
380 return -EINVAL;
381 case Opt_uid:
382 ctx->uid = result.uid;
383 break;
384 case Opt_gid:
385 ctx->gid = result.gid;
386 break;
387 case Opt_umask:
388 ctx->umask = result.uint_32;
389 break;
390 case Opt_case:
391 ctx->lowercase = result.uint_32;
392 break;
393 case Opt_check:
394 ctx->chk = result.uint_32;
395 break;
396 case Opt_err:
397 ctx->errs = result.uint_32;
398 break;
399 case Opt_eas:
400 ctx->eas = result.uint_32;
401 break;
402 case Opt_chkdsk:
403 ctx->chkdsk = result.uint_32;
404 break;
405 case Opt_timeshift:
406 {
407 int m = 1;
408 char *rhs = param->string;
409 int timeshift;
410
411 if (*rhs == '-') m = -1;
412 if (*rhs == '+' || *rhs == '-') rhs++;
413 timeshift = simple_strtoul(rhs, &rhs, 0) * m;
414 if (*rhs)
415 return -EINVAL;
416 ctx->timeshift = timeshift;
417 break;
418 }
419 default:
420 return -EINVAL;
421 }
422
423 return 0;
424}
425
426static int hpfs_reconfigure(struct fs_context *fc)
427{
428 struct hpfs_fc_context *ctx = fc->fs_private;
429 struct super_block *s = fc->root->d_sb;
430 struct hpfs_sb_info *sbi = hpfs_sb(s);
431
432 sync_filesystem(s);
433
434 fc->sb_flags |= SB_NOATIME;
435
436 hpfs_lock(s);
437
438 if (ctx->timeshift != sbi->sb_timeshift) {
439 pr_err("timeshift can't be changed using remount.\n");
440 goto out_err;
441 }
442
443 unmark_dirty(s);
444
445 sbi->sb_uid = ctx->uid; sbi->sb_gid = ctx->gid;
446 sbi->sb_mode = 0777 & ~ctx->umask;
447 sbi->sb_lowercase = ctx->lowercase;
448 sbi->sb_eas = ctx->eas; sbi->sb_chk = ctx->chk;
449 sbi->sb_chkdsk = ctx->chkdsk;
450 sbi->sb_err = ctx->errs; sbi->sb_timeshift = ctx->timeshift;
451
452 if (!(fc->sb_flags & SB_RDONLY)) mark_dirty(s, 1);
453
454 hpfs_unlock(s);
455 return 0;
456
457out_err:
458 hpfs_unlock(s);
459 return -EINVAL;
460}
461
462static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
463{
464 struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
465
466 seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
467 seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
468 seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
469 if (sbi->sb_lowercase)
470 seq_printf(seq, ",case=lower");
471 if (!sbi->sb_chk)
472 seq_printf(seq, ",check=none");
473 if (sbi->sb_chk == 2)
474 seq_printf(seq, ",check=strict");
475 if (!sbi->sb_err)
476 seq_printf(seq, ",errors=continue");
477 if (sbi->sb_err == 2)
478 seq_printf(seq, ",errors=panic");
479 if (!sbi->sb_chkdsk)
480 seq_printf(seq, ",chkdsk=no");
481 if (sbi->sb_chkdsk == 2)
482 seq_printf(seq, ",chkdsk=always");
483 if (!sbi->sb_eas)
484 seq_printf(seq, ",eas=no");
485 if (sbi->sb_eas == 1)
486 seq_printf(seq, ",eas=ro");
487 if (sbi->sb_timeshift)
488 seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
489 return 0;
490}
491
492/* Super operations */
493
494static const struct super_operations hpfs_sops =
495{
496 .alloc_inode = hpfs_alloc_inode,
497 .free_inode = hpfs_free_inode,
498 .evict_inode = hpfs_evict_inode,
499 .put_super = hpfs_put_super,
500 .statfs = hpfs_statfs,
501 .show_options = hpfs_show_options,
502};
503
504static int hpfs_fill_super(struct super_block *s, struct fs_context *fc)
505{
506 struct hpfs_fc_context *ctx = fc->fs_private;
507 struct buffer_head *bh0, *bh1, *bh2;
508 struct hpfs_boot_block *bootblock;
509 struct hpfs_super_block *superblock;
510 struct hpfs_spare_block *spareblock;
511 struct hpfs_sb_info *sbi;
512 struct inode *root;
513 int silent = fc->sb_flags & SB_SILENT;
514
515 dnode_secno root_dno;
516 struct hpfs_dirent *de = NULL;
517 struct quad_buffer_head qbh;
518
519 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
520 if (!sbi) {
521 return -ENOMEM;
522 }
523 s->s_fs_info = sbi;
524
525 mutex_init(&sbi->hpfs_mutex);
526 hpfs_lock(s);
527
528 /*sbi->sb_mounting = 1;*/
529 sb_set_blocksize(s, 512);
530 sbi->sb_fs_size = -1;
531 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
532 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
533 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
534
535 /* Check magics */
536 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
537 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
538 || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
539 if (!silent)
540 pr_err("Bad magic ... probably not HPFS\n");
541 goto bail4;
542 }
543
544 /* Check version */
545 if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
546 pr_err("Bad version %d,%d. Mount readonly to go around\n",
547 (int)superblock->version, (int)superblock->funcversion);
548 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");
549 goto bail4;
550 }
551
552 s->s_flags |= SB_NOATIME;
553
554 /* Fill superblock stuff */
555 s->s_magic = HPFS_SUPER_MAGIC;
556 s->s_op = &hpfs_sops;
557 s->s_d_op = &hpfs_dentry_operations;
558 s->s_time_min = local_to_gmt(s, 0);
559 s->s_time_max = local_to_gmt(s, U32_MAX);
560
561 sbi->sb_root = le32_to_cpu(superblock->root);
562 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
563 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
564 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
565 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
566 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
567 sbi->sb_uid = ctx->uid;
568 sbi->sb_gid = ctx->gid;
569 sbi->sb_mode = 0777 & ~ctx->umask;
570 sbi->sb_n_free = -1;
571 sbi->sb_n_free_dnodes = -1;
572 sbi->sb_lowercase = ctx->lowercase;
573 sbi->sb_eas = ctx->eas;
574 sbi->sb_chk = ctx->chk;
575 sbi->sb_chkdsk = ctx->chkdsk;
576 sbi->sb_err = ctx->errs;
577 sbi->sb_timeshift = ctx->timeshift;
578 sbi->sb_was_error = 0;
579 sbi->sb_cp_table = NULL;
580 sbi->sb_c_bitmap = -1;
581 sbi->sb_max_fwd_alloc = 0xffffff;
582
583 if (sbi->sb_fs_size >= 0x80000000) {
584 hpfs_error(s, "invalid size in superblock: %08x",
585 (unsigned)sbi->sb_fs_size);
586 goto bail4;
587 }
588
589 if (spareblock->n_spares_used)
590 hpfs_load_hotfix_map(s, spareblock);
591
592 /* Load bitmap directory */
593 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
594 goto bail4;
595
596 /* Check for general fs errors*/
597 if (spareblock->dirty && !spareblock->old_wrote) {
598 if (sbi->sb_err == 2) {
599 pr_err("Improperly stopped, not mounted\n");
600 goto bail4;
601 }
602 hpfs_error(s, "improperly stopped");
603 }
604
605 if (!sb_rdonly(s)) {
606 spareblock->dirty = 1;
607 spareblock->old_wrote = 0;
608 mark_buffer_dirty(bh2);
609 }
610
611 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
612 if (sbi->sb_err >= 2) {
613 pr_err("Spare dnodes used, try chkdsk\n");
614 mark_dirty(s, 0);
615 goto bail4;
616 }
617 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
618 if (sbi->sb_err == 0)
619 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
620 }
621 if (sbi->sb_chk) {
622 unsigned a;
623 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
624 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
625 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
626 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
627 goto bail4;
628 }
629 a = sbi->sb_dirband_size;
630 sbi->sb_dirband_size = 0;
631 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
632 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
633 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
634 mark_dirty(s, 0);
635 goto bail4;
636 }
637 sbi->sb_dirband_size = a;
638 } else
639 pr_err("You really don't want any checks? You are crazy...\n");
640
641 /* Load code page table */
642 if (le32_to_cpu(spareblock->n_code_pages))
643 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
644 pr_err("code page support is disabled\n");
645
646 brelse(bh2);
647 brelse(bh1);
648 brelse(bh0);
649
650 root = iget_locked(s, sbi->sb_root);
651 if (!root)
652 goto bail0;
653 hpfs_init_inode(root);
654 hpfs_read_inode(root);
655 unlock_new_inode(root);
656 s->s_root = d_make_root(root);
657 if (!s->s_root)
658 goto bail0;
659
660 /*
661 * find the root directory's . pointer & finish filling in the inode
662 */
663
664 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
665 if (root_dno)
666 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
667 if (!de)
668 hpfs_error(s, "unable to find root dir");
669 else {
670 inode_set_atime(root,
671 local_to_gmt(s, le32_to_cpu(de->read_date)),
672 0);
673 inode_set_mtime(root,
674 local_to_gmt(s, le32_to_cpu(de->write_date)),
675 0);
676 inode_set_ctime(root,
677 local_to_gmt(s, le32_to_cpu(de->creation_date)),
678 0);
679 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
680 hpfs_i(root)->i_parent_dir = root->i_ino;
681 if (root->i_size == -1)
682 root->i_size = 2048;
683 if (root->i_blocks == -1)
684 root->i_blocks = 5;
685 hpfs_brelse4(&qbh);
686 }
687 hpfs_unlock(s);
688 return 0;
689
690bail4: brelse(bh2);
691bail3: brelse(bh1);
692bail2: brelse(bh0);
693bail1:
694bail0:
695 hpfs_unlock(s);
696 free_sbi(sbi);
697 return -EINVAL;
698}
699
700static int hpfs_get_tree(struct fs_context *fc)
701{
702 return get_tree_bdev(fc, hpfs_fill_super);
703}
704
705static void hpfs_free_fc(struct fs_context *fc)
706{
707 kfree(fc->fs_private);
708}
709
710static const struct fs_context_operations hpfs_fc_context_ops = {
711 .parse_param = hpfs_parse_param,
712 .get_tree = hpfs_get_tree,
713 .reconfigure = hpfs_reconfigure,
714 .free = hpfs_free_fc,
715};
716
717static int hpfs_init_fs_context(struct fs_context *fc)
718{
719 struct hpfs_fc_context *ctx;
720
721 ctx = kzalloc(sizeof(struct hpfs_fc_context), GFP_KERNEL);
722 if (!ctx)
723 return -ENOMEM;
724
725 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
726 struct super_block *sb = fc->root->d_sb;
727 struct hpfs_sb_info *sbi = hpfs_sb(sb);
728
729 ctx->uid = sbi->sb_uid;
730 ctx->gid = sbi->sb_gid;
731 ctx->umask = 0777 & ~sbi->sb_mode;
732 ctx->lowercase = sbi->sb_lowercase;
733 ctx->eas = sbi->sb_eas;
734 ctx->chk = sbi->sb_chk;
735 ctx->chkdsk = sbi->sb_chkdsk;
736 ctx->errs = sbi->sb_err;
737 ctx->timeshift = sbi->sb_timeshift;
738
739 } else {
740 ctx->uid = current_uid();
741 ctx->gid = current_gid();
742 ctx->umask = current_umask();
743 ctx->lowercase = 0;
744 ctx->eas = 2;
745 ctx->chk = 1;
746 ctx->errs = 1;
747 ctx->chkdsk = 1;
748 ctx->timeshift = 0;
749 }
750
751 fc->fs_private = ctx;
752 fc->ops = &hpfs_fc_context_ops;
753
754 return 0;
755};
756
757static struct file_system_type hpfs_fs_type = {
758 .owner = THIS_MODULE,
759 .name = "hpfs",
760 .kill_sb = kill_block_super,
761 .fs_flags = FS_REQUIRES_DEV,
762 .init_fs_context = hpfs_init_fs_context,
763 .parameters = hpfs_param_spec,
764};
765MODULE_ALIAS_FS("hpfs");
766
767static int __init init_hpfs_fs(void)
768{
769 int err = init_inodecache();
770 if (err)
771 goto out1;
772 err = register_filesystem(&hpfs_fs_type);
773 if (err)
774 goto out;
775 return 0;
776out:
777 destroy_inodecache();
778out1:
779 return err;
780}
781
782static void __exit exit_hpfs_fs(void)
783{
784 unregister_filesystem(&hpfs_fs_type);
785 destroy_inodecache();
786}
787
788module_init(init_hpfs_fs)
789module_exit(exit_hpfs_fs)
790MODULE_DESCRIPTION("OS/2 HPFS file system support");
791MODULE_LICENSE("GPL");