Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
e18fa700 | 14 | #include <linux/magic.h> |
e8edc6e0 | 15 | #include <linux/sched.h> |
f4c54fcf | 16 | #include <linux/bitmap.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | |
19 | /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ | |
20 | ||
21 | static 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 | ||
38 | static 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... */ | |
352d94d0 | 52 | static char err_buf[1024]; |
1da177e4 | 53 | |
352d94d0 | 54 | void hpfs_error(struct super_block *s, const char *fmt, ...) |
1da177e4 | 55 | { |
352d94d0 AD |
56 | 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); | |
1da177e4 LT |
63 | 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"); | |
1da177e4 LT |
78 | 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 | ||
89 | int 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 | ||
101 | static void hpfs_put_super(struct super_block *s) | |
102 | { | |
103 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
6cfd0148 | 104 | |
7dd29d8d MP |
105 | hpfs_lock(s); |
106 | unmark_dirty(s); | |
107 | hpfs_unlock(s); | |
108 | ||
f99d49ad JJ |
109 | kfree(sbi->sb_cp_table); |
110 | kfree(sbi->sb_bmp_dir); | |
1da177e4 LT |
111 | s->s_fs_info = NULL; |
112 | kfree(sbi); | |
113 | } | |
114 | ||
115 | unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) | |
116 | { | |
117 | struct quad_buffer_head qbh; | |
f4c54fcf AM |
118 | unsigned long *bits; |
119 | unsigned count; | |
120 | ||
121 | bits = hpfs_map_4sectors(s, secno, &qbh, 4); | |
122 | if (!bits) | |
123 | return 0; | |
124 | count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); | |
1da177e4 LT |
125 | hpfs_brelse4(&qbh); |
126 | return count; | |
127 | } | |
128 | ||
129 | static unsigned count_bitmaps(struct super_block *s) | |
130 | { | |
131 | unsigned n, count, n_bands; | |
132 | n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; | |
133 | count = 0; | |
134 | for (n = 0; n < n_bands; n++) | |
135 | count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]); | |
136 | return count; | |
137 | } | |
138 | ||
726c3342 | 139 | static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 140 | { |
726c3342 | 141 | struct super_block *s = dentry->d_sb; |
1da177e4 | 142 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
604d295c | 143 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
9a311b96 | 144 | hpfs_lock(s); |
1da177e4 LT |
145 | |
146 | /*if (sbi->sb_n_free == -1) {*/ | |
147 | sbi->sb_n_free = count_bitmaps(s); | |
148 | sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap); | |
149 | /*}*/ | |
150 | buf->f_type = s->s_magic; | |
151 | buf->f_bsize = 512; | |
152 | buf->f_blocks = sbi->sb_fs_size; | |
153 | buf->f_bfree = sbi->sb_n_free; | |
154 | buf->f_bavail = sbi->sb_n_free; | |
155 | buf->f_files = sbi->sb_dirband_size / 4; | |
156 | buf->f_ffree = sbi->sb_n_free_dnodes; | |
604d295c CL |
157 | buf->f_fsid.val[0] = (u32)id; |
158 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
159 | buf->f_namelen = 254; |
160 | ||
9a311b96 | 161 | hpfs_unlock(s); |
1da177e4 LT |
162 | |
163 | return 0; | |
164 | } | |
165 | ||
e18b890b | 166 | static struct kmem_cache * hpfs_inode_cachep; |
1da177e4 LT |
167 | |
168 | static struct inode *hpfs_alloc_inode(struct super_block *sb) | |
169 | { | |
170 | struct hpfs_inode_info *ei; | |
e6b4f8da | 171 | ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); |
1da177e4 LT |
172 | if (!ei) |
173 | return NULL; | |
174 | ei->vfs_inode.i_version = 1; | |
175 | return &ei->vfs_inode; | |
176 | } | |
177 | ||
fa0d7e3d | 178 | static void hpfs_i_callback(struct rcu_head *head) |
1da177e4 | 179 | { |
fa0d7e3d NP |
180 | struct inode *inode = container_of(head, struct inode, i_rcu); |
181 | INIT_LIST_HEAD(&inode->i_dentry); | |
1da177e4 LT |
182 | kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); |
183 | } | |
184 | ||
fa0d7e3d NP |
185 | static void hpfs_destroy_inode(struct inode *inode) |
186 | { | |
187 | call_rcu(&inode->i_rcu, hpfs_i_callback); | |
188 | } | |
189 | ||
51cc5068 | 190 | static void init_once(void *foo) |
1da177e4 LT |
191 | { |
192 | struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; | |
193 | ||
a35afb83 | 194 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 195 | } |
20c2df83 | 196 | |
1da177e4 LT |
197 | static int init_inodecache(void) |
198 | { | |
199 | hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", | |
200 | sizeof(struct hpfs_inode_info), | |
fffb60f9 PJ |
201 | 0, (SLAB_RECLAIM_ACCOUNT| |
202 | SLAB_MEM_SPREAD), | |
20c2df83 | 203 | init_once); |
1da177e4 LT |
204 | if (hpfs_inode_cachep == NULL) |
205 | return -ENOMEM; | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static void destroy_inodecache(void) | |
210 | { | |
1a1d92c1 | 211 | kmem_cache_destroy(hpfs_inode_cachep); |
1da177e4 LT |
212 | } |
213 | ||
214 | /* | |
215 | * A tiny parser for option strings, stolen from dosfs. | |
216 | * Stolen again from read-only hpfs. | |
217 | * And updated for table-driven option parsing. | |
218 | */ | |
219 | ||
220 | enum { | |
221 | Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, | |
1da177e4 LT |
222 | Opt_check_none, Opt_check_normal, Opt_check_strict, |
223 | Opt_err_cont, Opt_err_ro, Opt_err_panic, | |
224 | Opt_eas_no, Opt_eas_ro, Opt_eas_rw, | |
225 | Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, | |
226 | Opt_timeshift, Opt_err, | |
227 | }; | |
228 | ||
a447c093 | 229 | static const match_table_t tokens = { |
1da177e4 LT |
230 | {Opt_help, "help"}, |
231 | {Opt_uid, "uid=%u"}, | |
232 | {Opt_gid, "gid=%u"}, | |
233 | {Opt_umask, "umask=%o"}, | |
234 | {Opt_case_lower, "case=lower"}, | |
235 | {Opt_case_asis, "case=asis"}, | |
1da177e4 LT |
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 | ||
252 | static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask, | |
0fe105aa | 253 | int *lowercase, int *eas, int *chk, int *errs, |
1da177e4 LT |
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; | |
1da177e4 LT |
295 | case Opt_check_none: |
296 | *chk = 0; | |
297 | break; | |
298 | case Opt_check_normal: | |
299 | *chk = 1; | |
300 | break; | |
301 | case Opt_check_strict: | |
302 | *chk = 2; | |
303 | break; | |
304 | case Opt_err_cont: | |
305 | *errs = 0; | |
306 | break; | |
307 | case Opt_err_ro: | |
308 | *errs = 1; | |
309 | break; | |
310 | case Opt_err_panic: | |
311 | *errs = 2; | |
312 | break; | |
313 | case Opt_eas_no: | |
314 | *eas = 0; | |
315 | break; | |
316 | case Opt_eas_ro: | |
317 | *eas = 1; | |
318 | break; | |
319 | case Opt_eas_rw: | |
320 | *eas = 2; | |
321 | break; | |
322 | case Opt_chkdsk_no: | |
323 | *chkdsk = 0; | |
324 | break; | |
325 | case Opt_chkdsk_errors: | |
326 | *chkdsk = 1; | |
327 | break; | |
328 | case Opt_chkdsk_always: | |
329 | *chkdsk = 2; | |
330 | break; | |
331 | case Opt_timeshift: | |
332 | { | |
333 | int m = 1; | |
334 | char *rhs = args[0].from; | |
335 | if (!rhs || !*rhs) | |
336 | return 0; | |
337 | if (*rhs == '-') m = -1; | |
338 | if (*rhs == '+' || *rhs == '-') rhs++; | |
339 | *timeshift = simple_strtoul(rhs, &rhs, 0) * m; | |
340 | if (*rhs) | |
341 | return 0; | |
342 | break; | |
343 | } | |
344 | default: | |
345 | return 0; | |
346 | } | |
347 | } | |
348 | return 1; | |
349 | } | |
350 | ||
351 | static inline void hpfs_help(void) | |
352 | { | |
353 | printk("\n\ | |
354 | HPFS filesystem options:\n\ | |
355 | help do not mount and display this text\n\ | |
356 | uid=xxx set uid of files that don't have uid specified in eas\n\ | |
357 | gid=xxx set gid of files that don't have gid specified in eas\n\ | |
358 | umask=xxx set mode of files that don't have mode specified in eas\n\ | |
359 | case=lower lowercase all files\n\ | |
360 | case=asis do not lowercase files (default)\n\ | |
1da177e4 LT |
361 | check=none no fs checks - kernel may crash on corrupted filesystem\n\ |
362 | check=normal do some checks - it should not crash (default)\n\ | |
363 | check=strict do extra time-consuming checks, used for debugging\n\ | |
364 | errors=continue continue on errors\n\ | |
365 | errors=remount-ro remount read-only if errors found (default)\n\ | |
366 | errors=panic panic on errors\n\ | |
367 | chkdsk=no do not mark fs for chkdsking even if there were errors\n\ | |
368 | chkdsk=errors mark fs dirty if errors found (default)\n\ | |
369 | chkdsk=always always mark fs dirty - used for debugging\n\ | |
370 | eas=no ignore extended attributes\n\ | |
371 | eas=ro read but do not write extended attributes\n\ | |
372 | eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ | |
373 | timeshift=nnn add nnn seconds to file times\n\ | |
374 | \n"); | |
375 | } | |
376 | ||
377 | static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) | |
378 | { | |
379 | uid_t uid; | |
380 | gid_t gid; | |
381 | umode_t umask; | |
0fe105aa | 382 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
383 | int o; |
384 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
6d9c1fd4 | 385 | char *new_opts = kstrdup(data, GFP_KERNEL); |
1da177e4 LT |
386 | |
387 | *flags |= MS_NOATIME; | |
388 | ||
9a311b96 | 389 | hpfs_lock(s); |
bbd6851a | 390 | lock_super(s); |
1da177e4 LT |
391 | uid = sbi->sb_uid; gid = sbi->sb_gid; |
392 | umask = 0777 & ~sbi->sb_mode; | |
0fe105aa | 393 | lowercase = sbi->sb_lowercase; |
1da177e4 LT |
394 | eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; |
395 | errs = sbi->sb_err; timeshift = sbi->sb_timeshift; | |
396 | ||
0fe105aa | 397 | if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, |
1da177e4 LT |
398 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
399 | printk("HPFS: bad mount options.\n"); | |
6d9c1fd4 | 400 | goto out_err; |
1da177e4 LT |
401 | } |
402 | if (o == 2) { | |
403 | hpfs_help(); | |
6d9c1fd4 | 404 | goto out_err; |
1da177e4 LT |
405 | } |
406 | if (timeshift != sbi->sb_timeshift) { | |
407 | printk("HPFS: timeshift can't be changed using remount.\n"); | |
6d9c1fd4 | 408 | goto out_err; |
1da177e4 LT |
409 | } |
410 | ||
411 | unmark_dirty(s); | |
412 | ||
413 | sbi->sb_uid = uid; sbi->sb_gid = gid; | |
414 | sbi->sb_mode = 0777 & ~umask; | |
0fe105aa | 415 | sbi->sb_lowercase = lowercase; |
1da177e4 LT |
416 | sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; |
417 | sbi->sb_err = errs; sbi->sb_timeshift = timeshift; | |
418 | ||
419 | if (!(*flags & MS_RDONLY)) mark_dirty(s); | |
420 | ||
2a32cebd | 421 | replace_mount_options(s, new_opts); |
6d9c1fd4 | 422 | |
bbd6851a | 423 | unlock_super(s); |
9a311b96 | 424 | hpfs_unlock(s); |
1da177e4 | 425 | return 0; |
6d9c1fd4 MS |
426 | |
427 | out_err: | |
bbd6851a | 428 | unlock_super(s); |
9a311b96 | 429 | hpfs_unlock(s); |
6d9c1fd4 MS |
430 | kfree(new_opts); |
431 | return -EINVAL; | |
1da177e4 LT |
432 | } |
433 | ||
434 | /* Super operations */ | |
435 | ||
ee9b6d61 | 436 | static const struct super_operations hpfs_sops = |
1da177e4 LT |
437 | { |
438 | .alloc_inode = hpfs_alloc_inode, | |
439 | .destroy_inode = hpfs_destroy_inode, | |
ea544009 | 440 | .evict_inode = hpfs_evict_inode, |
1da177e4 LT |
441 | .put_super = hpfs_put_super, |
442 | .statfs = hpfs_statfs, | |
443 | .remount_fs = hpfs_remount_fs, | |
6d9c1fd4 | 444 | .show_options = generic_show_options, |
1da177e4 LT |
445 | }; |
446 | ||
447 | static int hpfs_fill_super(struct super_block *s, void *options, int silent) | |
448 | { | |
449 | struct buffer_head *bh0, *bh1, *bh2; | |
450 | struct hpfs_boot_block *bootblock; | |
451 | struct hpfs_super_block *superblock; | |
452 | struct hpfs_spare_block *spareblock; | |
453 | struct hpfs_sb_info *sbi; | |
454 | struct inode *root; | |
455 | ||
456 | uid_t uid; | |
457 | gid_t gid; | |
458 | umode_t umask; | |
0fe105aa | 459 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
460 | |
461 | dnode_secno root_dno; | |
462 | struct hpfs_dirent *de = NULL; | |
463 | struct quad_buffer_head qbh; | |
464 | ||
465 | int o; | |
466 | ||
6d9c1fd4 MS |
467 | save_mount_options(s, options); |
468 | ||
f8314dc6 | 469 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
db719222 | 470 | if (!sbi) { |
1da177e4 | 471 | return -ENOMEM; |
db719222 | 472 | } |
1da177e4 | 473 | s->s_fs_info = sbi; |
1da177e4 LT |
474 | |
475 | sbi->sb_bmp_dir = NULL; | |
476 | sbi->sb_cp_table = NULL; | |
477 | ||
7dd29d8d MP |
478 | mutex_init(&sbi->hpfs_mutex); |
479 | hpfs_lock(s); | |
480 | ||
de395b8a DH |
481 | uid = current_uid(); |
482 | gid = current_gid(); | |
ce3b0f8d | 483 | umask = current_umask(); |
1da177e4 | 484 | lowercase = 0; |
1da177e4 LT |
485 | eas = 2; |
486 | chk = 1; | |
487 | errs = 1; | |
488 | chkdsk = 1; | |
489 | timeshift = 0; | |
490 | ||
0fe105aa | 491 | if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, |
1da177e4 LT |
492 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
493 | printk("HPFS: bad mount options.\n"); | |
494 | goto bail0; | |
495 | } | |
496 | if (o==2) { | |
497 | hpfs_help(); | |
498 | goto bail0; | |
499 | } | |
500 | ||
501 | /*sbi->sb_mounting = 1;*/ | |
502 | sb_set_blocksize(s, 512); | |
503 | sbi->sb_fs_size = -1; | |
504 | if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; | |
505 | if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; | |
506 | if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; | |
507 | ||
508 | /* Check magics */ | |
509 | if (/*bootblock->magic != BB_MAGIC | |
510 | ||*/ superblock->magic != SB_MAGIC | |
511 | || spareblock->magic != SP_MAGIC) { | |
512 | if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n"); | |
513 | goto bail4; | |
514 | } | |
515 | ||
516 | /* Check version */ | |
517 | if (!(s->s_flags & MS_RDONLY) && | |
518 | superblock->funcversion != 2 && superblock->funcversion != 3) { | |
519 | printk("HPFS: Bad version %d,%d. Mount readonly to go around\n", | |
520 | (int)superblock->version, (int)superblock->funcversion); | |
521 | 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"); | |
522 | goto bail4; | |
523 | } | |
524 | ||
525 | s->s_flags |= MS_NOATIME; | |
526 | ||
527 | /* Fill superblock stuff */ | |
528 | s->s_magic = HPFS_SUPER_MAGIC; | |
529 | s->s_op = &hpfs_sops; | |
43d344d7 | 530 | s->s_d_op = &hpfs_dentry_operations; |
1da177e4 LT |
531 | |
532 | sbi->sb_root = superblock->root; | |
533 | sbi->sb_fs_size = superblock->n_sectors; | |
534 | sbi->sb_bitmaps = superblock->bitmaps; | |
535 | sbi->sb_dirband_start = superblock->dir_band_start; | |
536 | sbi->sb_dirband_size = superblock->n_dir_band; | |
537 | sbi->sb_dmap = superblock->dir_band_bitmap; | |
538 | sbi->sb_uid = uid; | |
539 | sbi->sb_gid = gid; | |
540 | sbi->sb_mode = 0777 & ~umask; | |
541 | sbi->sb_n_free = -1; | |
542 | sbi->sb_n_free_dnodes = -1; | |
543 | sbi->sb_lowercase = lowercase; | |
1da177e4 LT |
544 | sbi->sb_eas = eas; |
545 | sbi->sb_chk = chk; | |
546 | sbi->sb_chkdsk = chkdsk; | |
547 | sbi->sb_err = errs; | |
548 | sbi->sb_timeshift = timeshift; | |
549 | sbi->sb_was_error = 0; | |
550 | sbi->sb_cp_table = NULL; | |
551 | sbi->sb_c_bitmap = -1; | |
552 | sbi->sb_max_fwd_alloc = 0xffffff; | |
553 | ||
554 | /* Load bitmap directory */ | |
555 | if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps))) | |
556 | goto bail4; | |
557 | ||
558 | /* Check for general fs errors*/ | |
559 | if (spareblock->dirty && !spareblock->old_wrote) { | |
560 | if (errs == 2) { | |
561 | printk("HPFS: Improperly stopped, not mounted\n"); | |
562 | goto bail4; | |
563 | } | |
564 | hpfs_error(s, "improperly stopped"); | |
565 | } | |
566 | ||
567 | if (!(s->s_flags & MS_RDONLY)) { | |
568 | spareblock->dirty = 1; | |
569 | spareblock->old_wrote = 0; | |
570 | mark_buffer_dirty(bh2); | |
571 | } | |
572 | ||
573 | if (spareblock->hotfixes_used || spareblock->n_spares_used) { | |
574 | if (errs >= 2) { | |
575 | printk("HPFS: Hotfixes not supported here, try chkdsk\n"); | |
576 | mark_dirty(s); | |
577 | goto bail4; | |
578 | } | |
579 | hpfs_error(s, "hotfixes not supported here, try chkdsk"); | |
580 | if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n"); | |
581 | else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n"); | |
582 | } | |
583 | if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) { | |
584 | if (errs >= 2) { | |
585 | printk("HPFS: Spare dnodes used, try chkdsk\n"); | |
586 | mark_dirty(s); | |
587 | goto bail4; | |
588 | } | |
589 | hpfs_error(s, "warning: spare dnodes used, try chkdsk"); | |
590 | if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); | |
591 | } | |
592 | if (chk) { | |
593 | unsigned a; | |
594 | if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band || | |
595 | superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) { | |
596 | hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", | |
597 | superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band); | |
598 | goto bail4; | |
599 | } | |
600 | a = sbi->sb_dirband_size; | |
601 | sbi->sb_dirband_size = 0; | |
602 | if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") || | |
603 | hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") || | |
604 | hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) { | |
605 | mark_dirty(s); | |
606 | goto bail4; | |
607 | } | |
608 | sbi->sb_dirband_size = a; | |
609 | } else printk("HPFS: You really don't want any checks? You are crazy...\n"); | |
610 | ||
611 | /* Load code page table */ | |
612 | if (spareblock->n_code_pages) | |
613 | if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir))) | |
614 | printk("HPFS: Warning: code page support is disabled\n"); | |
615 | ||
616 | brelse(bh2); | |
617 | brelse(bh1); | |
618 | brelse(bh0); | |
619 | ||
620 | root = iget_locked(s, sbi->sb_root); | |
621 | if (!root) | |
622 | goto bail0; | |
623 | hpfs_init_inode(root); | |
624 | hpfs_read_inode(root); | |
625 | unlock_new_inode(root); | |
626 | s->s_root = d_alloc_root(root); | |
627 | if (!s->s_root) { | |
628 | iput(root); | |
629 | goto bail0; | |
630 | } | |
1da177e4 LT |
631 | |
632 | /* | |
633 | * find the root directory's . pointer & finish filling in the inode | |
634 | */ | |
635 | ||
636 | root_dno = hpfs_fnode_dno(s, sbi->sb_root); | |
637 | if (root_dno) | |
638 | de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); | |
639 | if (!de) | |
640 | hpfs_error(s, "unable to find root dir"); | |
641 | else { | |
642 | root->i_atime.tv_sec = local_to_gmt(s, de->read_date); | |
643 | root->i_atime.tv_nsec = 0; | |
644 | root->i_mtime.tv_sec = local_to_gmt(s, de->write_date); | |
645 | root->i_mtime.tv_nsec = 0; | |
646 | root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date); | |
647 | root->i_ctime.tv_nsec = 0; | |
648 | hpfs_i(root)->i_ea_size = de->ea_size; | |
649 | hpfs_i(root)->i_parent_dir = root->i_ino; | |
650 | if (root->i_size == -1) | |
651 | root->i_size = 2048; | |
652 | if (root->i_blocks == -1) | |
653 | root->i_blocks = 5; | |
654 | hpfs_brelse4(&qbh); | |
655 | } | |
7dd29d8d | 656 | hpfs_unlock(s); |
1da177e4 LT |
657 | return 0; |
658 | ||
659 | bail4: brelse(bh2); | |
660 | bail3: brelse(bh1); | |
661 | bail2: brelse(bh0); | |
662 | bail1: | |
663 | bail0: | |
7dd29d8d | 664 | hpfs_unlock(s); |
f99d49ad JJ |
665 | kfree(sbi->sb_bmp_dir); |
666 | kfree(sbi->sb_cp_table); | |
1da177e4 LT |
667 | s->s_fs_info = NULL; |
668 | kfree(sbi); | |
669 | return -EINVAL; | |
670 | } | |
671 | ||
152a0836 AV |
672 | static struct dentry *hpfs_mount(struct file_system_type *fs_type, |
673 | int flags, const char *dev_name, void *data) | |
1da177e4 | 674 | { |
152a0836 | 675 | return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); |
1da177e4 LT |
676 | } |
677 | ||
678 | static struct file_system_type hpfs_fs_type = { | |
679 | .owner = THIS_MODULE, | |
680 | .name = "hpfs", | |
152a0836 | 681 | .mount = hpfs_mount, |
1da177e4 LT |
682 | .kill_sb = kill_block_super, |
683 | .fs_flags = FS_REQUIRES_DEV, | |
684 | }; | |
685 | ||
686 | static int __init init_hpfs_fs(void) | |
687 | { | |
688 | int err = init_inodecache(); | |
689 | if (err) | |
690 | goto out1; | |
691 | err = register_filesystem(&hpfs_fs_type); | |
692 | if (err) | |
693 | goto out; | |
694 | return 0; | |
695 | out: | |
696 | destroy_inodecache(); | |
697 | out1: | |
698 | return err; | |
699 | } | |
700 | ||
701 | static void __exit exit_hpfs_fs(void) | |
702 | { | |
703 | unregister_filesystem(&hpfs_fs_type); | |
704 | destroy_inodecache(); | |
705 | } | |
706 | ||
707 | module_init(init_hpfs_fs) | |
708 | module_exit(exit_hpfs_fs) | |
709 | MODULE_LICENSE("GPL"); |