blob: cadc4ce48656674358e44eeb62e16f4f5bdc9b01 [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>
Alessio Igor Bogani337eb002009-05-12 15:10:54 +020016#include <linux/smp_lock.h>
Akinobu Mitaf4c54fc2009-12-15 16:46:56 -080017#include <linux/bitmap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
20
21static void mark_dirty(struct super_block *s)
22{
23 if (hpfs_sb(s)->sb_chkdsk && !(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 brelse(bh);
31 }
32 }
33}
34
35/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
36 were errors) */
37
38static void unmark_dirty(struct super_block *s)
39{
40 struct buffer_head *bh;
41 struct hpfs_spare_block *sb;
42 if (s->s_flags & MS_RDONLY) return;
43 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
44 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
45 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
46 mark_buffer_dirty(bh);
47 brelse(bh);
48 }
49}
50
51/* Filesystem error... */
Alexey Dobriyan352d94d2006-12-06 20:37:04 -080052static char err_buf[1024];
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Alexey Dobriyan352d94d2006-12-06 20:37:04 -080054void hpfs_error(struct super_block *s, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Alexey Dobriyan352d94d2006-12-06 20:37:04 -080056 va_list args;
57
58 va_start(args, fmt);
59 vsnprintf(err_buf, sizeof(err_buf), fmt, args);
60 va_end(args);
61
62 printk("HPFS: filesystem error: %s", err_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 if (!hpfs_sb(s)->sb_was_error) {
64 if (hpfs_sb(s)->sb_err == 2) {
65 printk("; crashing the system because you wanted it\n");
66 mark_dirty(s);
67 panic("HPFS panic");
68 } else if (hpfs_sb(s)->sb_err == 1) {
69 if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
70 else {
71 printk("; remounting read-only\n");
72 mark_dirty(s);
73 s->s_flags |= MS_RDONLY;
74 }
75 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
76 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
77 } else printk("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 hpfs_sb(s)->sb_was_error = 1;
79}
80
81/*
82 * A little trick to detect cycles in many hpfs structures and don't let the
83 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
84 *
85 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
86 * nested each in other, chkdsk locked up happilly.
87 */
88
89int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
90 char *msg)
91{
92 if (*c2 && *c1 == key) {
93 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
94 return 1;
95 }
96 (*c2)++;
97 if (!((*c2 - 1) & *c2)) *c1 = key;
98 return 0;
99}
100
101static void hpfs_put_super(struct super_block *s)
102{
103 struct hpfs_sb_info *sbi = hpfs_sb(s);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +0200104
105 lock_kernel();
106
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800107 kfree(sbi->sb_cp_table);
108 kfree(sbi->sb_bmp_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 unmark_dirty(s);
110 s->s_fs_info = NULL;
111 kfree(sbi);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +0200112
113 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
116unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
117{
118 struct quad_buffer_head qbh;
Akinobu Mitaf4c54fc2009-12-15 16:46:56 -0800119 unsigned long *bits;
120 unsigned count;
121
122 bits = hpfs_map_4sectors(s, secno, &qbh, 4);
123 if (!bits)
124 return 0;
125 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 hpfs_brelse4(&qbh);
127 return count;
128}
129
130static unsigned count_bitmaps(struct super_block *s)
131{
132 unsigned n, count, n_bands;
133 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
134 count = 0;
135 for (n = 0; n < n_bands; n++)
136 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
137 return count;
138}
139
David Howells726c3342006-06-23 02:02:58 -0700140static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
David Howells726c3342006-06-23 02:02:58 -0700142 struct super_block *s = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 struct hpfs_sb_info *sbi = hpfs_sb(s);
Coly Li604d2952009-04-02 16:59:37 -0700144 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 lock_kernel();
146
147 /*if (sbi->sb_n_free == -1) {*/
148 sbi->sb_n_free = count_bitmaps(s);
149 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
150 /*}*/
151 buf->f_type = s->s_magic;
152 buf->f_bsize = 512;
153 buf->f_blocks = sbi->sb_fs_size;
154 buf->f_bfree = sbi->sb_n_free;
155 buf->f_bavail = sbi->sb_n_free;
156 buf->f_files = sbi->sb_dirband_size / 4;
157 buf->f_ffree = sbi->sb_n_free_dnodes;
Coly Li604d2952009-04-02 16:59:37 -0700158 buf->f_fsid.val[0] = (u32)id;
159 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 buf->f_namelen = 254;
161
162 unlock_kernel();
163
164 return 0;
165}
166
Christoph Lametere18b8902006-12-06 20:33:20 -0800167static struct kmem_cache * hpfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169static struct inode *hpfs_alloc_inode(struct super_block *sb)
170{
171 struct hpfs_inode_info *ei;
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800172 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (!ei)
174 return NULL;
175 ei->vfs_inode.i_version = 1;
176 return &ei->vfs_inode;
177}
178
179static void hpfs_destroy_inode(struct inode *inode)
180{
181 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
182}
183
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700184static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
186 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
187
Christoph Lametera35afb82007-05-16 22:10:57 -0700188 mutex_init(&ei->i_mutex);
189 mutex_init(&ei->i_parent_mutex);
190 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
Paul Mundt20c2df82007-07-20 10:11:58 +0900192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193static int init_inodecache(void)
194{
195 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
196 sizeof(struct hpfs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800197 0, (SLAB_RECLAIM_ACCOUNT|
198 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900199 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 if (hpfs_inode_cachep == NULL)
201 return -ENOMEM;
202 return 0;
203}
204
205static void destroy_inodecache(void)
206{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700207 kmem_cache_destroy(hpfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208}
209
210/*
211 * A tiny parser for option strings, stolen from dosfs.
212 * Stolen again from read-only hpfs.
213 * And updated for table-driven option parsing.
214 */
215
216enum {
217 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
218 Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
219 Opt_check_none, Opt_check_normal, Opt_check_strict,
220 Opt_err_cont, Opt_err_ro, Opt_err_panic,
221 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
222 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
223 Opt_timeshift, Opt_err,
224};
225
Steven Whitehousea447c092008-10-13 10:46:57 +0100226static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 {Opt_help, "help"},
228 {Opt_uid, "uid=%u"},
229 {Opt_gid, "gid=%u"},
230 {Opt_umask, "umask=%o"},
231 {Opt_case_lower, "case=lower"},
232 {Opt_case_asis, "case=asis"},
233 {Opt_conv_binary, "conv=binary"},
234 {Opt_conv_text, "conv=text"},
235 {Opt_conv_auto, "conv=auto"},
236 {Opt_check_none, "check=none"},
237 {Opt_check_normal, "check=normal"},
238 {Opt_check_strict, "check=strict"},
239 {Opt_err_cont, "errors=continue"},
240 {Opt_err_ro, "errors=remount-ro"},
241 {Opt_err_panic, "errors=panic"},
242 {Opt_eas_no, "eas=no"},
243 {Opt_eas_ro, "eas=ro"},
244 {Opt_eas_rw, "eas=rw"},
245 {Opt_chkdsk_no, "chkdsk=no"},
246 {Opt_chkdsk_errors, "chkdsk=errors"},
247 {Opt_chkdsk_always, "chkdsk=always"},
248 {Opt_timeshift, "timeshift=%d"},
249 {Opt_err, NULL},
250};
251
252static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
253 int *lowercase, int *conv, int *eas, int *chk, int *errs,
254 int *chkdsk, int *timeshift)
255{
256 char *p;
257 int option;
258
259 if (!opts)
260 return 1;
261
262 /*printk("Parsing opts: '%s'\n",opts);*/
263
264 while ((p = strsep(&opts, ",")) != NULL) {
265 substring_t args[MAX_OPT_ARGS];
266 int token;
267 if (!*p)
268 continue;
269
270 token = match_token(p, tokens, args);
271 switch (token) {
272 case Opt_help:
273 return 2;
274 case Opt_uid:
275 if (match_int(args, &option))
276 return 0;
277 *uid = option;
278 break;
279 case Opt_gid:
280 if (match_int(args, &option))
281 return 0;
282 *gid = option;
283 break;
284 case Opt_umask:
285 if (match_octal(args, &option))
286 return 0;
287 *umask = option;
288 break;
289 case Opt_case_lower:
290 *lowercase = 1;
291 break;
292 case Opt_case_asis:
293 *lowercase = 0;
294 break;
295 case Opt_conv_binary:
296 *conv = CONV_BINARY;
297 break;
298 case Opt_conv_text:
299 *conv = CONV_TEXT;
300 break;
301 case Opt_conv_auto:
302 *conv = CONV_AUTO;
303 break;
304 case Opt_check_none:
305 *chk = 0;
306 break;
307 case Opt_check_normal:
308 *chk = 1;
309 break;
310 case Opt_check_strict:
311 *chk = 2;
312 break;
313 case Opt_err_cont:
314 *errs = 0;
315 break;
316 case Opt_err_ro:
317 *errs = 1;
318 break;
319 case Opt_err_panic:
320 *errs = 2;
321 break;
322 case Opt_eas_no:
323 *eas = 0;
324 break;
325 case Opt_eas_ro:
326 *eas = 1;
327 break;
328 case Opt_eas_rw:
329 *eas = 2;
330 break;
331 case Opt_chkdsk_no:
332 *chkdsk = 0;
333 break;
334 case Opt_chkdsk_errors:
335 *chkdsk = 1;
336 break;
337 case Opt_chkdsk_always:
338 *chkdsk = 2;
339 break;
340 case Opt_timeshift:
341 {
342 int m = 1;
343 char *rhs = args[0].from;
344 if (!rhs || !*rhs)
345 return 0;
346 if (*rhs == '-') m = -1;
347 if (*rhs == '+' || *rhs == '-') rhs++;
348 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
349 if (*rhs)
350 return 0;
351 break;
352 }
353 default:
354 return 0;
355 }
356 }
357 return 1;
358}
359
360static inline void hpfs_help(void)
361{
362 printk("\n\
363HPFS filesystem options:\n\
364 help do not mount and display this text\n\
365 uid=xxx set uid of files that don't have uid specified in eas\n\
366 gid=xxx set gid of files that don't have gid specified in eas\n\
367 umask=xxx set mode of files that don't have mode specified in eas\n\
368 case=lower lowercase all files\n\
369 case=asis do not lowercase files (default)\n\
370 conv=binary do not convert CR/LF -> LF (default)\n\
371 conv=auto convert only files with known text extensions\n\
372 conv=text convert all files\n\
373 check=none no fs checks - kernel may crash on corrupted filesystem\n\
374 check=normal do some checks - it should not crash (default)\n\
375 check=strict do extra time-consuming checks, used for debugging\n\
376 errors=continue continue on errors\n\
377 errors=remount-ro remount read-only if errors found (default)\n\
378 errors=panic panic on errors\n\
379 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
380 chkdsk=errors mark fs dirty if errors found (default)\n\
381 chkdsk=always always mark fs dirty - used for debugging\n\
382 eas=no ignore extended attributes\n\
383 eas=ro read but do not write extended attributes\n\
384 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
385 timeshift=nnn add nnn seconds to file times\n\
386\n");
387}
388
389static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
390{
391 uid_t uid;
392 gid_t gid;
393 umode_t umask;
394 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
395 int o;
396 struct hpfs_sb_info *sbi = hpfs_sb(s);
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800397 char *new_opts = kstrdup(data, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399 *flags |= MS_NOATIME;
400
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200401 lock_kernel();
Al Virobbd68512009-05-06 10:43:07 -0400402 lock_super(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 uid = sbi->sb_uid; gid = sbi->sb_gid;
404 umask = 0777 & ~sbi->sb_mode;
405 lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
406 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
407 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
408
409 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
410 &eas, &chk, &errs, &chkdsk, &timeshift))) {
411 printk("HPFS: bad mount options.\n");
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800412 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 }
414 if (o == 2) {
415 hpfs_help();
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800416 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 }
418 if (timeshift != sbi->sb_timeshift) {
419 printk("HPFS: timeshift can't be changed using remount.\n");
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800420 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 }
422
423 unmark_dirty(s);
424
425 sbi->sb_uid = uid; sbi->sb_gid = gid;
426 sbi->sb_mode = 0777 & ~umask;
427 sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
428 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
429 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
430
431 if (!(*flags & MS_RDONLY)) mark_dirty(s);
432
Al Viro2a32ceb2009-05-08 16:05:57 -0400433 replace_mount_options(s, new_opts);
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800434
Al Virobbd68512009-05-06 10:43:07 -0400435 unlock_super(s);
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200436 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return 0;
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800438
439out_err:
Al Virobbd68512009-05-06 10:43:07 -0400440 unlock_super(s);
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200441 unlock_kernel();
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800442 kfree(new_opts);
443 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444}
445
446/* Super operations */
447
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800448static const struct super_operations hpfs_sops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449{
450 .alloc_inode = hpfs_alloc_inode,
451 .destroy_inode = hpfs_destroy_inode,
452 .delete_inode = hpfs_delete_inode,
453 .put_super = hpfs_put_super,
454 .statfs = hpfs_statfs,
455 .remount_fs = hpfs_remount_fs,
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800456 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457};
458
459static int hpfs_fill_super(struct super_block *s, void *options, int silent)
460{
461 struct buffer_head *bh0, *bh1, *bh2;
462 struct hpfs_boot_block *bootblock;
463 struct hpfs_super_block *superblock;
464 struct hpfs_spare_block *spareblock;
465 struct hpfs_sb_info *sbi;
466 struct inode *root;
467
468 uid_t uid;
469 gid_t gid;
470 umode_t umask;
471 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
472
473 dnode_secno root_dno;
474 struct hpfs_dirent *de = NULL;
475 struct quad_buffer_head qbh;
476
477 int o;
478
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800479 save_mount_options(s, options);
480
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700481 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 if (!sbi)
483 return -ENOMEM;
484 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 sbi->sb_bmp_dir = NULL;
487 sbi->sb_cp_table = NULL;
488
489 init_MUTEX(&sbi->hpfs_creation_de);
490
David Howellsde395b82008-11-14 10:38:55 +1100491 uid = current_uid();
492 gid = current_gid();
Al Viroce3b0f82009-03-29 19:08:22 -0400493 umask = current_umask();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 lowercase = 0;
495 conv = CONV_BINARY;
496 eas = 2;
497 chk = 1;
498 errs = 1;
499 chkdsk = 1;
500 timeshift = 0;
501
502 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
503 &eas, &chk, &errs, &chkdsk, &timeshift))) {
504 printk("HPFS: bad mount options.\n");
505 goto bail0;
506 }
507 if (o==2) {
508 hpfs_help();
509 goto bail0;
510 }
511
512 /*sbi->sb_mounting = 1;*/
513 sb_set_blocksize(s, 512);
514 sbi->sb_fs_size = -1;
515 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
516 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
517 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
518
519 /* Check magics */
520 if (/*bootblock->magic != BB_MAGIC
521 ||*/ superblock->magic != SB_MAGIC
522 || spareblock->magic != SP_MAGIC) {
523 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
524 goto bail4;
525 }
526
527 /* Check version */
528 if (!(s->s_flags & MS_RDONLY) &&
529 superblock->funcversion != 2 && superblock->funcversion != 3) {
530 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
531 (int)superblock->version, (int)superblock->funcversion);
532 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");
533 goto bail4;
534 }
535
536 s->s_flags |= MS_NOATIME;
537
538 /* Fill superblock stuff */
539 s->s_magic = HPFS_SUPER_MAGIC;
540 s->s_op = &hpfs_sops;
541
542 sbi->sb_root = superblock->root;
543 sbi->sb_fs_size = superblock->n_sectors;
544 sbi->sb_bitmaps = superblock->bitmaps;
545 sbi->sb_dirband_start = superblock->dir_band_start;
546 sbi->sb_dirband_size = superblock->n_dir_band;
547 sbi->sb_dmap = superblock->dir_band_bitmap;
548 sbi->sb_uid = uid;
549 sbi->sb_gid = gid;
550 sbi->sb_mode = 0777 & ~umask;
551 sbi->sb_n_free = -1;
552 sbi->sb_n_free_dnodes = -1;
553 sbi->sb_lowercase = lowercase;
554 sbi->sb_conv = conv;
555 sbi->sb_eas = eas;
556 sbi->sb_chk = chk;
557 sbi->sb_chkdsk = chkdsk;
558 sbi->sb_err = errs;
559 sbi->sb_timeshift = timeshift;
560 sbi->sb_was_error = 0;
561 sbi->sb_cp_table = NULL;
562 sbi->sb_c_bitmap = -1;
563 sbi->sb_max_fwd_alloc = 0xffffff;
564
565 /* Load bitmap directory */
566 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
567 goto bail4;
568
569 /* Check for general fs errors*/
570 if (spareblock->dirty && !spareblock->old_wrote) {
571 if (errs == 2) {
572 printk("HPFS: Improperly stopped, not mounted\n");
573 goto bail4;
574 }
575 hpfs_error(s, "improperly stopped");
576 }
577
578 if (!(s->s_flags & MS_RDONLY)) {
579 spareblock->dirty = 1;
580 spareblock->old_wrote = 0;
581 mark_buffer_dirty(bh2);
582 }
583
584 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
585 if (errs >= 2) {
586 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
587 mark_dirty(s);
588 goto bail4;
589 }
590 hpfs_error(s, "hotfixes not supported here, try chkdsk");
591 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
592 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
593 }
594 if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
595 if (errs >= 2) {
596 printk("HPFS: Spare dnodes used, try chkdsk\n");
597 mark_dirty(s);
598 goto bail4;
599 }
600 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
601 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
602 }
603 if (chk) {
604 unsigned a;
605 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
606 superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
607 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
608 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
609 goto bail4;
610 }
611 a = sbi->sb_dirband_size;
612 sbi->sb_dirband_size = 0;
613 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
614 hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
615 hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
616 mark_dirty(s);
617 goto bail4;
618 }
619 sbi->sb_dirband_size = a;
620 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
621
622 /* Load code page table */
623 if (spareblock->n_code_pages)
624 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
625 printk("HPFS: Warning: code page support is disabled\n");
626
627 brelse(bh2);
628 brelse(bh1);
629 brelse(bh0);
630
631 root = iget_locked(s, sbi->sb_root);
632 if (!root)
633 goto bail0;
634 hpfs_init_inode(root);
635 hpfs_read_inode(root);
636 unlock_new_inode(root);
637 s->s_root = d_alloc_root(root);
638 if (!s->s_root) {
639 iput(root);
640 goto bail0;
641 }
642 hpfs_set_dentry_operations(s->s_root);
643
644 /*
645 * find the root directory's . pointer & finish filling in the inode
646 */
647
648 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
649 if (root_dno)
650 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
651 if (!de)
652 hpfs_error(s, "unable to find root dir");
653 else {
654 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
655 root->i_atime.tv_nsec = 0;
656 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
657 root->i_mtime.tv_nsec = 0;
658 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
659 root->i_ctime.tv_nsec = 0;
660 hpfs_i(root)->i_ea_size = de->ea_size;
661 hpfs_i(root)->i_parent_dir = root->i_ino;
662 if (root->i_size == -1)
663 root->i_size = 2048;
664 if (root->i_blocks == -1)
665 root->i_blocks = 5;
666 hpfs_brelse4(&qbh);
667 }
668 return 0;
669
670bail4: brelse(bh2);
671bail3: brelse(bh1);
672bail2: brelse(bh0);
673bail1:
674bail0:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800675 kfree(sbi->sb_bmp_dir);
676 kfree(sbi->sb_cp_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 s->s_fs_info = NULL;
678 kfree(sbi);
679 return -EINVAL;
680}
681
David Howells454e2392006-06-23 02:02:57 -0700682static int hpfs_get_sb(struct file_system_type *fs_type,
683 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684{
David Howells454e2392006-06-23 02:02:57 -0700685 return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
686 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687}
688
689static struct file_system_type hpfs_fs_type = {
690 .owner = THIS_MODULE,
691 .name = "hpfs",
692 .get_sb = hpfs_get_sb,
693 .kill_sb = kill_block_super,
694 .fs_flags = FS_REQUIRES_DEV,
695};
696
697static int __init init_hpfs_fs(void)
698{
699 int err = init_inodecache();
700 if (err)
701 goto out1;
702 err = register_filesystem(&hpfs_fs_type);
703 if (err)
704 goto out;
705 return 0;
706out:
707 destroy_inodecache();
708out1:
709 return err;
710}
711
712static void __exit exit_hpfs_fs(void)
713{
714 unregister_filesystem(&hpfs_fs_type);
715 destroy_inodecache();
716}
717
718module_init(init_hpfs_fs)
719module_exit(exit_hpfs_fs)
720MODULE_LICENSE("GPL");