blob: c696d01bc8f7954c8d7cfc12b3e3c714f8ebc20f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Jeff Garzike18fa702006-09-24 11:13:19 -040014#include <linux/magic.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040015#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
18
19static void mark_dirty(struct super_block *s)
20{
21 if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
22 struct buffer_head *bh;
23 struct hpfs_spare_block *sb;
24 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
25 sb->dirty = 1;
26 sb->old_wrote = 0;
27 mark_buffer_dirty(bh);
28 brelse(bh);
29 }
30 }
31}
32
33/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
34 were errors) */
35
36static void unmark_dirty(struct super_block *s)
37{
38 struct buffer_head *bh;
39 struct hpfs_spare_block *sb;
40 if (s->s_flags & MS_RDONLY) return;
41 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
42 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
43 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
44 mark_buffer_dirty(bh);
45 brelse(bh);
46 }
47}
48
49/* Filesystem error... */
Alexey Dobriyan352d94d2006-12-06 20:37:04 -080050static char err_buf[1024];
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Alexey Dobriyan352d94d2006-12-06 20:37:04 -080052void hpfs_error(struct super_block *s, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Alexey Dobriyan352d94d2006-12-06 20:37:04 -080054 va_list args;
55
56 va_start(args, fmt);
57 vsnprintf(err_buf, sizeof(err_buf), fmt, args);
58 va_end(args);
59
60 printk("HPFS: filesystem error: %s", err_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 if (!hpfs_sb(s)->sb_was_error) {
62 if (hpfs_sb(s)->sb_err == 2) {
63 printk("; crashing the system because you wanted it\n");
64 mark_dirty(s);
65 panic("HPFS panic");
66 } else if (hpfs_sb(s)->sb_err == 1) {
67 if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
68 else {
69 printk("; remounting read-only\n");
70 mark_dirty(s);
71 s->s_flags |= MS_RDONLY;
72 }
73 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
74 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
75 } else printk("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 hpfs_sb(s)->sb_was_error = 1;
77}
78
79/*
80 * A little trick to detect cycles in many hpfs structures and don't let the
81 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
82 *
83 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
84 * nested each in other, chkdsk locked up happilly.
85 */
86
87int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
88 char *msg)
89{
90 if (*c2 && *c1 == key) {
91 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
92 return 1;
93 }
94 (*c2)++;
95 if (!((*c2 - 1) & *c2)) *c1 = key;
96 return 0;
97}
98
99static void hpfs_put_super(struct super_block *s)
100{
101 struct hpfs_sb_info *sbi = hpfs_sb(s);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800102 kfree(sbi->sb_cp_table);
103 kfree(sbi->sb_bmp_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 unmark_dirty(s);
105 s->s_fs_info = NULL;
106 kfree(sbi);
107}
108
109unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
110{
111 struct quad_buffer_head qbh;
112 unsigned *bits;
113 unsigned i, count;
114 if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
115 count = 0;
116 for (i = 0; i < 2048 / sizeof(unsigned); i++) {
117 unsigned b;
118 if (!bits[i]) continue;
119 for (b = bits[i]; b; b>>=1) count += b & 1;
120 }
121 hpfs_brelse4(&qbh);
122 return count;
123}
124
125static unsigned count_bitmaps(struct super_block *s)
126{
127 unsigned n, count, n_bands;
128 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
129 count = 0;
130 for (n = 0; n < n_bands; n++)
131 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
132 return count;
133}
134
David Howells726c3342006-06-23 02:02:58 -0700135static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
David Howells726c3342006-06-23 02:02:58 -0700137 struct super_block *s = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 struct hpfs_sb_info *sbi = hpfs_sb(s);
139 lock_kernel();
140
141 /*if (sbi->sb_n_free == -1) {*/
142 sbi->sb_n_free = count_bitmaps(s);
143 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
144 /*}*/
145 buf->f_type = s->s_magic;
146 buf->f_bsize = 512;
147 buf->f_blocks = sbi->sb_fs_size;
148 buf->f_bfree = sbi->sb_n_free;
149 buf->f_bavail = sbi->sb_n_free;
150 buf->f_files = sbi->sb_dirband_size / 4;
151 buf->f_ffree = sbi->sb_n_free_dnodes;
152 buf->f_namelen = 254;
153
154 unlock_kernel();
155
156 return 0;
157}
158
Christoph Lametere18b8902006-12-06 20:33:20 -0800159static struct kmem_cache * hpfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161static struct inode *hpfs_alloc_inode(struct super_block *sb)
162{
163 struct hpfs_inode_info *ei;
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800164 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 if (!ei)
166 return NULL;
167 ei->vfs_inode.i_version = 1;
168 return &ei->vfs_inode;
169}
170
171static void hpfs_destroy_inode(struct inode *inode)
172{
173 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
174}
175
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700176static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
178 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
179
Christoph Lametera35afb82007-05-16 22:10:57 -0700180 mutex_init(&ei->i_mutex);
181 mutex_init(&ei->i_parent_mutex);
182 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
Paul Mundt20c2df82007-07-20 10:11:58 +0900184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185static int init_inodecache(void)
186{
187 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
188 sizeof(struct hpfs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800189 0, (SLAB_RECLAIM_ACCOUNT|
190 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900191 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (hpfs_inode_cachep == NULL)
193 return -ENOMEM;
194 return 0;
195}
196
197static void destroy_inodecache(void)
198{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700199 kmem_cache_destroy(hpfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200}
201
202/*
203 * A tiny parser for option strings, stolen from dosfs.
204 * Stolen again from read-only hpfs.
205 * And updated for table-driven option parsing.
206 */
207
208enum {
209 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
210 Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
211 Opt_check_none, Opt_check_normal, Opt_check_strict,
212 Opt_err_cont, Opt_err_ro, Opt_err_panic,
213 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
214 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
215 Opt_timeshift, Opt_err,
216};
217
Steven Whitehousea447c092008-10-13 10:46:57 +0100218static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 {Opt_help, "help"},
220 {Opt_uid, "uid=%u"},
221 {Opt_gid, "gid=%u"},
222 {Opt_umask, "umask=%o"},
223 {Opt_case_lower, "case=lower"},
224 {Opt_case_asis, "case=asis"},
225 {Opt_conv_binary, "conv=binary"},
226 {Opt_conv_text, "conv=text"},
227 {Opt_conv_auto, "conv=auto"},
228 {Opt_check_none, "check=none"},
229 {Opt_check_normal, "check=normal"},
230 {Opt_check_strict, "check=strict"},
231 {Opt_err_cont, "errors=continue"},
232 {Opt_err_ro, "errors=remount-ro"},
233 {Opt_err_panic, "errors=panic"},
234 {Opt_eas_no, "eas=no"},
235 {Opt_eas_ro, "eas=ro"},
236 {Opt_eas_rw, "eas=rw"},
237 {Opt_chkdsk_no, "chkdsk=no"},
238 {Opt_chkdsk_errors, "chkdsk=errors"},
239 {Opt_chkdsk_always, "chkdsk=always"},
240 {Opt_timeshift, "timeshift=%d"},
241 {Opt_err, NULL},
242};
243
244static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
245 int *lowercase, int *conv, int *eas, int *chk, int *errs,
246 int *chkdsk, int *timeshift)
247{
248 char *p;
249 int option;
250
251 if (!opts)
252 return 1;
253
254 /*printk("Parsing opts: '%s'\n",opts);*/
255
256 while ((p = strsep(&opts, ",")) != NULL) {
257 substring_t args[MAX_OPT_ARGS];
258 int token;
259 if (!*p)
260 continue;
261
262 token = match_token(p, tokens, args);
263 switch (token) {
264 case Opt_help:
265 return 2;
266 case Opt_uid:
267 if (match_int(args, &option))
268 return 0;
269 *uid = option;
270 break;
271 case Opt_gid:
272 if (match_int(args, &option))
273 return 0;
274 *gid = option;
275 break;
276 case Opt_umask:
277 if (match_octal(args, &option))
278 return 0;
279 *umask = option;
280 break;
281 case Opt_case_lower:
282 *lowercase = 1;
283 break;
284 case Opt_case_asis:
285 *lowercase = 0;
286 break;
287 case Opt_conv_binary:
288 *conv = CONV_BINARY;
289 break;
290 case Opt_conv_text:
291 *conv = CONV_TEXT;
292 break;
293 case Opt_conv_auto:
294 *conv = CONV_AUTO;
295 break;
296 case Opt_check_none:
297 *chk = 0;
298 break;
299 case Opt_check_normal:
300 *chk = 1;
301 break;
302 case Opt_check_strict:
303 *chk = 2;
304 break;
305 case Opt_err_cont:
306 *errs = 0;
307 break;
308 case Opt_err_ro:
309 *errs = 1;
310 break;
311 case Opt_err_panic:
312 *errs = 2;
313 break;
314 case Opt_eas_no:
315 *eas = 0;
316 break;
317 case Opt_eas_ro:
318 *eas = 1;
319 break;
320 case Opt_eas_rw:
321 *eas = 2;
322 break;
323 case Opt_chkdsk_no:
324 *chkdsk = 0;
325 break;
326 case Opt_chkdsk_errors:
327 *chkdsk = 1;
328 break;
329 case Opt_chkdsk_always:
330 *chkdsk = 2;
331 break;
332 case Opt_timeshift:
333 {
334 int m = 1;
335 char *rhs = args[0].from;
336 if (!rhs || !*rhs)
337 return 0;
338 if (*rhs == '-') m = -1;
339 if (*rhs == '+' || *rhs == '-') rhs++;
340 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
341 if (*rhs)
342 return 0;
343 break;
344 }
345 default:
346 return 0;
347 }
348 }
349 return 1;
350}
351
352static inline void hpfs_help(void)
353{
354 printk("\n\
355HPFS filesystem options:\n\
356 help do not mount and display this text\n\
357 uid=xxx set uid of files that don't have uid specified in eas\n\
358 gid=xxx set gid of files that don't have gid specified in eas\n\
359 umask=xxx set mode of files that don't have mode specified in eas\n\
360 case=lower lowercase all files\n\
361 case=asis do not lowercase files (default)\n\
362 conv=binary do not convert CR/LF -> LF (default)\n\
363 conv=auto convert only files with known text extensions\n\
364 conv=text convert all files\n\
365 check=none no fs checks - kernel may crash on corrupted filesystem\n\
366 check=normal do some checks - it should not crash (default)\n\
367 check=strict do extra time-consuming checks, used for debugging\n\
368 errors=continue continue on errors\n\
369 errors=remount-ro remount read-only if errors found (default)\n\
370 errors=panic panic on errors\n\
371 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
372 chkdsk=errors mark fs dirty if errors found (default)\n\
373 chkdsk=always always mark fs dirty - used for debugging\n\
374 eas=no ignore extended attributes\n\
375 eas=ro read but do not write extended attributes\n\
376 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
377 timeshift=nnn add nnn seconds to file times\n\
378\n");
379}
380
381static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
382{
383 uid_t uid;
384 gid_t gid;
385 umode_t umask;
386 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
387 int o;
388 struct hpfs_sb_info *sbi = hpfs_sb(s);
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800389 char *new_opts = kstrdup(data, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
391 *flags |= MS_NOATIME;
392
393 uid = sbi->sb_uid; gid = sbi->sb_gid;
394 umask = 0777 & ~sbi->sb_mode;
395 lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
396 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
397 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
398
399 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
400 &eas, &chk, &errs, &chkdsk, &timeshift))) {
401 printk("HPFS: bad mount options.\n");
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800402 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 }
404 if (o == 2) {
405 hpfs_help();
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800406 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 }
408 if (timeshift != sbi->sb_timeshift) {
409 printk("HPFS: timeshift can't be changed using remount.\n");
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800410 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 }
412
413 unmark_dirty(s);
414
415 sbi->sb_uid = uid; sbi->sb_gid = gid;
416 sbi->sb_mode = 0777 & ~umask;
417 sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
418 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
419 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
420
421 if (!(*flags & MS_RDONLY)) mark_dirty(s);
422
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800423 kfree(s->s_options);
424 s->s_options = new_opts;
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 return 0;
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800427
428out_err:
429 kfree(new_opts);
430 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
432
433/* Super operations */
434
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800435static const struct super_operations hpfs_sops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436{
437 .alloc_inode = hpfs_alloc_inode,
438 .destroy_inode = hpfs_destroy_inode,
439 .delete_inode = hpfs_delete_inode,
440 .put_super = hpfs_put_super,
441 .statfs = hpfs_statfs,
442 .remount_fs = hpfs_remount_fs,
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800443 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444};
445
446static int hpfs_fill_super(struct super_block *s, void *options, int silent)
447{
448 struct buffer_head *bh0, *bh1, *bh2;
449 struct hpfs_boot_block *bootblock;
450 struct hpfs_super_block *superblock;
451 struct hpfs_spare_block *spareblock;
452 struct hpfs_sb_info *sbi;
453 struct inode *root;
454
455 uid_t uid;
456 gid_t gid;
457 umode_t umask;
458 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
459
460 dnode_secno root_dno;
461 struct hpfs_dirent *de = NULL;
462 struct quad_buffer_head qbh;
463
464 int o;
465
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800466 save_mount_options(s, options);
467
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700468 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 if (!sbi)
470 return -ENOMEM;
471 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
473 sbi->sb_bmp_dir = NULL;
474 sbi->sb_cp_table = NULL;
475
476 init_MUTEX(&sbi->hpfs_creation_de);
477
David Howellsde395b82008-11-14 10:38:55 +1100478 uid = current_uid();
479 gid = current_gid();
Al Viroce3b0f82009-03-29 19:08:22 -0400480 umask = current_umask();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 lowercase = 0;
482 conv = CONV_BINARY;
483 eas = 2;
484 chk = 1;
485 errs = 1;
486 chkdsk = 1;
487 timeshift = 0;
488
489 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
490 &eas, &chk, &errs, &chkdsk, &timeshift))) {
491 printk("HPFS: bad mount options.\n");
492 goto bail0;
493 }
494 if (o==2) {
495 hpfs_help();
496 goto bail0;
497 }
498
499 /*sbi->sb_mounting = 1;*/
500 sb_set_blocksize(s, 512);
501 sbi->sb_fs_size = -1;
502 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
503 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
504 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
505
506 /* Check magics */
507 if (/*bootblock->magic != BB_MAGIC
508 ||*/ superblock->magic != SB_MAGIC
509 || spareblock->magic != SP_MAGIC) {
510 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
511 goto bail4;
512 }
513
514 /* Check version */
515 if (!(s->s_flags & MS_RDONLY) &&
516 superblock->funcversion != 2 && superblock->funcversion != 3) {
517 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
518 (int)superblock->version, (int)superblock->funcversion);
519 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");
520 goto bail4;
521 }
522
523 s->s_flags |= MS_NOATIME;
524
525 /* Fill superblock stuff */
526 s->s_magic = HPFS_SUPER_MAGIC;
527 s->s_op = &hpfs_sops;
528
529 sbi->sb_root = superblock->root;
530 sbi->sb_fs_size = superblock->n_sectors;
531 sbi->sb_bitmaps = superblock->bitmaps;
532 sbi->sb_dirband_start = superblock->dir_band_start;
533 sbi->sb_dirband_size = superblock->n_dir_band;
534 sbi->sb_dmap = superblock->dir_band_bitmap;
535 sbi->sb_uid = uid;
536 sbi->sb_gid = gid;
537 sbi->sb_mode = 0777 & ~umask;
538 sbi->sb_n_free = -1;
539 sbi->sb_n_free_dnodes = -1;
540 sbi->sb_lowercase = lowercase;
541 sbi->sb_conv = conv;
542 sbi->sb_eas = eas;
543 sbi->sb_chk = chk;
544 sbi->sb_chkdsk = chkdsk;
545 sbi->sb_err = errs;
546 sbi->sb_timeshift = timeshift;
547 sbi->sb_was_error = 0;
548 sbi->sb_cp_table = NULL;
549 sbi->sb_c_bitmap = -1;
550 sbi->sb_max_fwd_alloc = 0xffffff;
551
552 /* Load bitmap directory */
553 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
554 goto bail4;
555
556 /* Check for general fs errors*/
557 if (spareblock->dirty && !spareblock->old_wrote) {
558 if (errs == 2) {
559 printk("HPFS: Improperly stopped, not mounted\n");
560 goto bail4;
561 }
562 hpfs_error(s, "improperly stopped");
563 }
564
565 if (!(s->s_flags & MS_RDONLY)) {
566 spareblock->dirty = 1;
567 spareblock->old_wrote = 0;
568 mark_buffer_dirty(bh2);
569 }
570
571 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
572 if (errs >= 2) {
573 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
574 mark_dirty(s);
575 goto bail4;
576 }
577 hpfs_error(s, "hotfixes not supported here, try chkdsk");
578 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
579 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
580 }
581 if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
582 if (errs >= 2) {
583 printk("HPFS: Spare dnodes used, try chkdsk\n");
584 mark_dirty(s);
585 goto bail4;
586 }
587 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
588 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
589 }
590 if (chk) {
591 unsigned a;
592 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
593 superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
594 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
595 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
596 goto bail4;
597 }
598 a = sbi->sb_dirband_size;
599 sbi->sb_dirband_size = 0;
600 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
601 hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
602 hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
603 mark_dirty(s);
604 goto bail4;
605 }
606 sbi->sb_dirband_size = a;
607 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
608
609 /* Load code page table */
610 if (spareblock->n_code_pages)
611 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
612 printk("HPFS: Warning: code page support is disabled\n");
613
614 brelse(bh2);
615 brelse(bh1);
616 brelse(bh0);
617
618 root = iget_locked(s, sbi->sb_root);
619 if (!root)
620 goto bail0;
621 hpfs_init_inode(root);
622 hpfs_read_inode(root);
623 unlock_new_inode(root);
624 s->s_root = d_alloc_root(root);
625 if (!s->s_root) {
626 iput(root);
627 goto bail0;
628 }
629 hpfs_set_dentry_operations(s->s_root);
630
631 /*
632 * find the root directory's . pointer & finish filling in the inode
633 */
634
635 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
636 if (root_dno)
637 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
638 if (!de)
639 hpfs_error(s, "unable to find root dir");
640 else {
641 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
642 root->i_atime.tv_nsec = 0;
643 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
644 root->i_mtime.tv_nsec = 0;
645 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
646 root->i_ctime.tv_nsec = 0;
647 hpfs_i(root)->i_ea_size = de->ea_size;
648 hpfs_i(root)->i_parent_dir = root->i_ino;
649 if (root->i_size == -1)
650 root->i_size = 2048;
651 if (root->i_blocks == -1)
652 root->i_blocks = 5;
653 hpfs_brelse4(&qbh);
654 }
655 return 0;
656
657bail4: brelse(bh2);
658bail3: brelse(bh1);
659bail2: brelse(bh0);
660bail1:
661bail0:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800662 kfree(sbi->sb_bmp_dir);
663 kfree(sbi->sb_cp_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 s->s_fs_info = NULL;
665 kfree(sbi);
666 return -EINVAL;
667}
668
David Howells454e2392006-06-23 02:02:57 -0700669static int hpfs_get_sb(struct file_system_type *fs_type,
670 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671{
David Howells454e2392006-06-23 02:02:57 -0700672 return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
673 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674}
675
676static struct file_system_type hpfs_fs_type = {
677 .owner = THIS_MODULE,
678 .name = "hpfs",
679 .get_sb = hpfs_get_sb,
680 .kill_sb = kill_block_super,
681 .fs_flags = FS_REQUIRES_DEV,
682};
683
684static int __init init_hpfs_fs(void)
685{
686 int err = init_inodecache();
687 if (err)
688 goto out1;
689 err = register_filesystem(&hpfs_fs_type);
690 if (err)
691 goto out;
692 return 0;
693out:
694 destroy_inodecache();
695out1:
696 return err;
697}
698
699static void __exit exit_hpfs_fs(void)
700{
701 unregister_filesystem(&hpfs_fs_type);
702 destroy_inodecache();
703}
704
705module_init(init_hpfs_fs)
706module_exit(exit_hpfs_fs)
707MODULE_LICENSE("GPL");