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Commit | Line | Data |
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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 | ||
dab4c82a | 21 | static void mark_dirty(struct super_block *s, int remount) |
1da177e4 | 22 | { |
dab4c82a | 23 | if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) { |
1da177e4 LT |
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); | |
f7397681 | 30 | sync_dirty_buffer(bh); |
1da177e4 LT |
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 | ||
39 | static 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; | |
f7397681 | 44 | sync_blockdev(s->s_bdev); |
1da177e4 LT |
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); | |
f7397681 | 49 | sync_dirty_buffer(bh); |
1da177e4 LT |
50 | brelse(bh); |
51 | } | |
52 | } | |
53 | ||
54 | /* Filesystem error... */ | |
352d94d0 | 55 | static char err_buf[1024]; |
1da177e4 | 56 | |
352d94d0 | 57 | void hpfs_error(struct super_block *s, const char *fmt, ...) |
1da177e4 | 58 | { |
352d94d0 AD |
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); | |
1da177e4 LT |
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"); | |
dab4c82a | 69 | mark_dirty(s, 0); |
1da177e4 LT |
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"); | |
dab4c82a | 75 | mark_dirty(s, 0); |
1da177e4 LT |
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"); | |
1da177e4 LT |
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 | ||
92 | int 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 | ||
30687e0a | 104 | static void free_sbi(struct hpfs_sb_info *sbi) |
1da177e4 | 105 | { |
30687e0a AV |
106 | kfree(sbi->sb_cp_table); |
107 | kfree(sbi->sb_bmp_dir); | |
108 | kfree(sbi); | |
109 | } | |
6cfd0148 | 110 | |
30687e0a AV |
111 | static void lazy_free_sbi(struct rcu_head *rcu) |
112 | { | |
113 | free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); | |
114 | } | |
115 | ||
116 | static void hpfs_put_super(struct super_block *s) | |
117 | { | |
7dd29d8d MP |
118 | hpfs_lock(s); |
119 | unmark_dirty(s); | |
120 | hpfs_unlock(s); | |
30687e0a | 121 | call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); |
1da177e4 LT |
122 | } |
123 | ||
124 | unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) | |
125 | { | |
126 | struct quad_buffer_head qbh; | |
f4c54fcf AM |
127 | unsigned long *bits; |
128 | unsigned count; | |
129 | ||
275f495d | 130 | bits = hpfs_map_4sectors(s, secno, &qbh, 0); |
f4c54fcf AM |
131 | if (!bits) |
132 | return 0; | |
133 | count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); | |
1da177e4 LT |
134 | hpfs_brelse4(&qbh); |
135 | return count; | |
136 | } | |
137 | ||
138 | static unsigned count_bitmaps(struct super_block *s) | |
139 | { | |
140 | unsigned n, count, n_bands; | |
141 | n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; | |
142 | count = 0; | |
275f495d MP |
143 | for (n = 0; n < COUNT_RD_AHEAD; n++) { |
144 | hpfs_prefetch_bitmap(s, n); | |
145 | } | |
146 | for (n = 0; n < n_bands; n++) { | |
147 | hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); | |
0b69760b | 148 | count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); |
275f495d | 149 | } |
1da177e4 LT |
150 | return count; |
151 | } | |
152 | ||
726c3342 | 153 | static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 154 | { |
726c3342 | 155 | struct super_block *s = dentry->d_sb; |
1da177e4 | 156 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
604d295c | 157 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
9a311b96 | 158 | hpfs_lock(s); |
1da177e4 LT |
159 | |
160 | /*if (sbi->sb_n_free == -1) {*/ | |
161 | sbi->sb_n_free = count_bitmaps(s); | |
162 | sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap); | |
163 | /*}*/ | |
164 | buf->f_type = s->s_magic; | |
165 | buf->f_bsize = 512; | |
166 | buf->f_blocks = sbi->sb_fs_size; | |
167 | buf->f_bfree = sbi->sb_n_free; | |
168 | buf->f_bavail = sbi->sb_n_free; | |
169 | buf->f_files = sbi->sb_dirband_size / 4; | |
170 | buf->f_ffree = sbi->sb_n_free_dnodes; | |
604d295c CL |
171 | buf->f_fsid.val[0] = (u32)id; |
172 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
173 | buf->f_namelen = 254; |
174 | ||
9a311b96 | 175 | hpfs_unlock(s); |
1da177e4 LT |
176 | |
177 | return 0; | |
178 | } | |
179 | ||
e18b890b | 180 | static struct kmem_cache * hpfs_inode_cachep; |
1da177e4 LT |
181 | |
182 | static struct inode *hpfs_alloc_inode(struct super_block *sb) | |
183 | { | |
184 | struct hpfs_inode_info *ei; | |
e6b4f8da | 185 | ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); |
1da177e4 LT |
186 | if (!ei) |
187 | return NULL; | |
188 | ei->vfs_inode.i_version = 1; | |
189 | return &ei->vfs_inode; | |
190 | } | |
191 | ||
fa0d7e3d | 192 | static void hpfs_i_callback(struct rcu_head *head) |
1da177e4 | 193 | { |
fa0d7e3d | 194 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
195 | kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); |
196 | } | |
197 | ||
fa0d7e3d NP |
198 | static void hpfs_destroy_inode(struct inode *inode) |
199 | { | |
200 | call_rcu(&inode->i_rcu, hpfs_i_callback); | |
201 | } | |
202 | ||
51cc5068 | 203 | static void init_once(void *foo) |
1da177e4 LT |
204 | { |
205 | struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; | |
206 | ||
a35afb83 | 207 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 208 | } |
20c2df83 | 209 | |
1da177e4 LT |
210 | static int init_inodecache(void) |
211 | { | |
212 | hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", | |
213 | sizeof(struct hpfs_inode_info), | |
fffb60f9 PJ |
214 | 0, (SLAB_RECLAIM_ACCOUNT| |
215 | SLAB_MEM_SPREAD), | |
20c2df83 | 216 | init_once); |
1da177e4 LT |
217 | if (hpfs_inode_cachep == NULL) |
218 | return -ENOMEM; | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static void destroy_inodecache(void) | |
223 | { | |
8c0a8537 KS |
224 | /* |
225 | * Make sure all delayed rcu free inodes are flushed before we | |
226 | * destroy cache. | |
227 | */ | |
228 | rcu_barrier(); | |
1a1d92c1 | 229 | kmem_cache_destroy(hpfs_inode_cachep); |
1da177e4 LT |
230 | } |
231 | ||
232 | /* | |
233 | * A tiny parser for option strings, stolen from dosfs. | |
234 | * Stolen again from read-only hpfs. | |
235 | * And updated for table-driven option parsing. | |
236 | */ | |
237 | ||
238 | enum { | |
239 | Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, | |
1da177e4 LT |
240 | Opt_check_none, Opt_check_normal, Opt_check_strict, |
241 | Opt_err_cont, Opt_err_ro, Opt_err_panic, | |
242 | Opt_eas_no, Opt_eas_ro, Opt_eas_rw, | |
243 | Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, | |
244 | Opt_timeshift, Opt_err, | |
245 | }; | |
246 | ||
a447c093 | 247 | static const match_table_t tokens = { |
1da177e4 LT |
248 | {Opt_help, "help"}, |
249 | {Opt_uid, "uid=%u"}, | |
250 | {Opt_gid, "gid=%u"}, | |
251 | {Opt_umask, "umask=%o"}, | |
252 | {Opt_case_lower, "case=lower"}, | |
253 | {Opt_case_asis, "case=asis"}, | |
1da177e4 LT |
254 | {Opt_check_none, "check=none"}, |
255 | {Opt_check_normal, "check=normal"}, | |
256 | {Opt_check_strict, "check=strict"}, | |
257 | {Opt_err_cont, "errors=continue"}, | |
258 | {Opt_err_ro, "errors=remount-ro"}, | |
259 | {Opt_err_panic, "errors=panic"}, | |
260 | {Opt_eas_no, "eas=no"}, | |
261 | {Opt_eas_ro, "eas=ro"}, | |
262 | {Opt_eas_rw, "eas=rw"}, | |
263 | {Opt_chkdsk_no, "chkdsk=no"}, | |
264 | {Opt_chkdsk_errors, "chkdsk=errors"}, | |
265 | {Opt_chkdsk_always, "chkdsk=always"}, | |
266 | {Opt_timeshift, "timeshift=%d"}, | |
267 | {Opt_err, NULL}, | |
268 | }; | |
269 | ||
0e1a43c7 | 270 | static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, |
0fe105aa | 271 | int *lowercase, int *eas, int *chk, int *errs, |
1da177e4 LT |
272 | int *chkdsk, int *timeshift) |
273 | { | |
274 | char *p; | |
275 | int option; | |
276 | ||
277 | if (!opts) | |
278 | return 1; | |
279 | ||
280 | /*printk("Parsing opts: '%s'\n",opts);*/ | |
281 | ||
282 | while ((p = strsep(&opts, ",")) != NULL) { | |
283 | substring_t args[MAX_OPT_ARGS]; | |
284 | int token; | |
285 | if (!*p) | |
286 | continue; | |
287 | ||
288 | token = match_token(p, tokens, args); | |
289 | switch (token) { | |
290 | case Opt_help: | |
291 | return 2; | |
292 | case Opt_uid: | |
293 | if (match_int(args, &option)) | |
294 | return 0; | |
0e1a43c7 EB |
295 | *uid = make_kuid(current_user_ns(), option); |
296 | if (!uid_valid(*uid)) | |
297 | return 0; | |
1da177e4 LT |
298 | break; |
299 | case Opt_gid: | |
300 | if (match_int(args, &option)) | |
301 | return 0; | |
0e1a43c7 EB |
302 | *gid = make_kgid(current_user_ns(), option); |
303 | if (!gid_valid(*gid)) | |
304 | return 0; | |
1da177e4 LT |
305 | break; |
306 | case Opt_umask: | |
307 | if (match_octal(args, &option)) | |
308 | return 0; | |
309 | *umask = option; | |
310 | break; | |
311 | case Opt_case_lower: | |
312 | *lowercase = 1; | |
313 | break; | |
314 | case Opt_case_asis: | |
315 | *lowercase = 0; | |
316 | break; | |
1da177e4 LT |
317 | case Opt_check_none: |
318 | *chk = 0; | |
319 | break; | |
320 | case Opt_check_normal: | |
321 | *chk = 1; | |
322 | break; | |
323 | case Opt_check_strict: | |
324 | *chk = 2; | |
325 | break; | |
326 | case Opt_err_cont: | |
327 | *errs = 0; | |
328 | break; | |
329 | case Opt_err_ro: | |
330 | *errs = 1; | |
331 | break; | |
332 | case Opt_err_panic: | |
333 | *errs = 2; | |
334 | break; | |
335 | case Opt_eas_no: | |
336 | *eas = 0; | |
337 | break; | |
338 | case Opt_eas_ro: | |
339 | *eas = 1; | |
340 | break; | |
341 | case Opt_eas_rw: | |
342 | *eas = 2; | |
343 | break; | |
344 | case Opt_chkdsk_no: | |
345 | *chkdsk = 0; | |
346 | break; | |
347 | case Opt_chkdsk_errors: | |
348 | *chkdsk = 1; | |
349 | break; | |
350 | case Opt_chkdsk_always: | |
351 | *chkdsk = 2; | |
352 | break; | |
353 | case Opt_timeshift: | |
354 | { | |
355 | int m = 1; | |
356 | char *rhs = args[0].from; | |
357 | if (!rhs || !*rhs) | |
358 | return 0; | |
359 | if (*rhs == '-') m = -1; | |
360 | if (*rhs == '+' || *rhs == '-') rhs++; | |
361 | *timeshift = simple_strtoul(rhs, &rhs, 0) * m; | |
362 | if (*rhs) | |
363 | return 0; | |
364 | break; | |
365 | } | |
366 | default: | |
367 | return 0; | |
368 | } | |
369 | } | |
370 | return 1; | |
371 | } | |
372 | ||
373 | static inline void hpfs_help(void) | |
374 | { | |
375 | printk("\n\ | |
376 | HPFS filesystem options:\n\ | |
377 | help do not mount and display this text\n\ | |
378 | uid=xxx set uid of files that don't have uid specified in eas\n\ | |
379 | gid=xxx set gid of files that don't have gid specified in eas\n\ | |
380 | umask=xxx set mode of files that don't have mode specified in eas\n\ | |
381 | case=lower lowercase all files\n\ | |
382 | case=asis do not lowercase files (default)\n\ | |
1da177e4 LT |
383 | check=none no fs checks - kernel may crash on corrupted filesystem\n\ |
384 | check=normal do some checks - it should not crash (default)\n\ | |
385 | check=strict do extra time-consuming checks, used for debugging\n\ | |
386 | errors=continue continue on errors\n\ | |
387 | errors=remount-ro remount read-only if errors found (default)\n\ | |
388 | errors=panic panic on errors\n\ | |
389 | chkdsk=no do not mark fs for chkdsking even if there were errors\n\ | |
390 | chkdsk=errors mark fs dirty if errors found (default)\n\ | |
391 | chkdsk=always always mark fs dirty - used for debugging\n\ | |
392 | eas=no ignore extended attributes\n\ | |
393 | eas=ro read but do not write extended attributes\n\ | |
394 | eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ | |
395 | timeshift=nnn add nnn seconds to file times\n\ | |
396 | \n"); | |
397 | } | |
398 | ||
399 | static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) | |
400 | { | |
0e1a43c7 EB |
401 | kuid_t uid; |
402 | kgid_t gid; | |
1da177e4 | 403 | umode_t umask; |
0fe105aa | 404 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
405 | int o; |
406 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
6d9c1fd4 | 407 | char *new_opts = kstrdup(data, GFP_KERNEL); |
1da177e4 LT |
408 | |
409 | *flags |= MS_NOATIME; | |
410 | ||
9a311b96 | 411 | hpfs_lock(s); |
1da177e4 LT |
412 | uid = sbi->sb_uid; gid = sbi->sb_gid; |
413 | umask = 0777 & ~sbi->sb_mode; | |
0fe105aa | 414 | lowercase = sbi->sb_lowercase; |
1da177e4 LT |
415 | eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; |
416 | errs = sbi->sb_err; timeshift = sbi->sb_timeshift; | |
417 | ||
0fe105aa | 418 | if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, |
1da177e4 LT |
419 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
420 | printk("HPFS: bad mount options.\n"); | |
6d9c1fd4 | 421 | goto out_err; |
1da177e4 LT |
422 | } |
423 | if (o == 2) { | |
424 | hpfs_help(); | |
6d9c1fd4 | 425 | goto out_err; |
1da177e4 LT |
426 | } |
427 | if (timeshift != sbi->sb_timeshift) { | |
428 | printk("HPFS: timeshift can't be changed using remount.\n"); | |
6d9c1fd4 | 429 | goto out_err; |
1da177e4 LT |
430 | } |
431 | ||
432 | unmark_dirty(s); | |
433 | ||
434 | sbi->sb_uid = uid; sbi->sb_gid = gid; | |
435 | sbi->sb_mode = 0777 & ~umask; | |
0fe105aa | 436 | sbi->sb_lowercase = lowercase; |
1da177e4 LT |
437 | sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; |
438 | sbi->sb_err = errs; sbi->sb_timeshift = timeshift; | |
439 | ||
dab4c82a | 440 | if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); |
1da177e4 | 441 | |
2a32cebd | 442 | replace_mount_options(s, new_opts); |
6d9c1fd4 | 443 | |
9a311b96 | 444 | hpfs_unlock(s); |
1da177e4 | 445 | return 0; |
6d9c1fd4 MS |
446 | |
447 | out_err: | |
9a311b96 | 448 | hpfs_unlock(s); |
6d9c1fd4 MS |
449 | kfree(new_opts); |
450 | return -EINVAL; | |
1da177e4 LT |
451 | } |
452 | ||
453 | /* Super operations */ | |
454 | ||
ee9b6d61 | 455 | static const struct super_operations hpfs_sops = |
1da177e4 LT |
456 | { |
457 | .alloc_inode = hpfs_alloc_inode, | |
458 | .destroy_inode = hpfs_destroy_inode, | |
ea544009 | 459 | .evict_inode = hpfs_evict_inode, |
1da177e4 LT |
460 | .put_super = hpfs_put_super, |
461 | .statfs = hpfs_statfs, | |
462 | .remount_fs = hpfs_remount_fs, | |
6d9c1fd4 | 463 | .show_options = generic_show_options, |
1da177e4 LT |
464 | }; |
465 | ||
466 | static int hpfs_fill_super(struct super_block *s, void *options, int silent) | |
467 | { | |
468 | struct buffer_head *bh0, *bh1, *bh2; | |
469 | struct hpfs_boot_block *bootblock; | |
470 | struct hpfs_super_block *superblock; | |
471 | struct hpfs_spare_block *spareblock; | |
472 | struct hpfs_sb_info *sbi; | |
473 | struct inode *root; | |
474 | ||
0e1a43c7 EB |
475 | kuid_t uid; |
476 | kgid_t gid; | |
1da177e4 | 477 | umode_t umask; |
0fe105aa | 478 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
479 | |
480 | dnode_secno root_dno; | |
481 | struct hpfs_dirent *de = NULL; | |
482 | struct quad_buffer_head qbh; | |
483 | ||
484 | int o; | |
485 | ||
6d9c1fd4 MS |
486 | save_mount_options(s, options); |
487 | ||
f8314dc6 | 488 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
db719222 | 489 | if (!sbi) { |
1da177e4 | 490 | return -ENOMEM; |
db719222 | 491 | } |
1da177e4 | 492 | s->s_fs_info = sbi; |
1da177e4 | 493 | |
7dd29d8d MP |
494 | mutex_init(&sbi->hpfs_mutex); |
495 | hpfs_lock(s); | |
496 | ||
de395b8a DH |
497 | uid = current_uid(); |
498 | gid = current_gid(); | |
ce3b0f8d | 499 | umask = current_umask(); |
1da177e4 | 500 | lowercase = 0; |
1da177e4 LT |
501 | eas = 2; |
502 | chk = 1; | |
503 | errs = 1; | |
504 | chkdsk = 1; | |
505 | timeshift = 0; | |
506 | ||
0fe105aa | 507 | if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, |
1da177e4 LT |
508 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
509 | printk("HPFS: bad mount options.\n"); | |
510 | goto bail0; | |
511 | } | |
512 | if (o==2) { | |
513 | hpfs_help(); | |
514 | goto bail0; | |
515 | } | |
516 | ||
517 | /*sbi->sb_mounting = 1;*/ | |
518 | sb_set_blocksize(s, 512); | |
519 | sbi->sb_fs_size = -1; | |
520 | if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; | |
521 | if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; | |
522 | if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; | |
523 | ||
524 | /* Check magics */ | |
0b69760b MP |
525 | if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC |
526 | ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC | |
527 | || le32_to_cpu(spareblock->magic) != SP_MAGIC) { | |
1da177e4 LT |
528 | if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n"); |
529 | goto bail4; | |
530 | } | |
531 | ||
532 | /* Check version */ | |
533 | if (!(s->s_flags & MS_RDONLY) && | |
534 | superblock->funcversion != 2 && superblock->funcversion != 3) { | |
535 | printk("HPFS: Bad version %d,%d. Mount readonly to go around\n", | |
536 | (int)superblock->version, (int)superblock->funcversion); | |
537 | 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"); | |
538 | goto bail4; | |
539 | } | |
540 | ||
541 | s->s_flags |= MS_NOATIME; | |
542 | ||
543 | /* Fill superblock stuff */ | |
544 | s->s_magic = HPFS_SUPER_MAGIC; | |
545 | s->s_op = &hpfs_sops; | |
43d344d7 | 546 | s->s_d_op = &hpfs_dentry_operations; |
1da177e4 | 547 | |
0b69760b MP |
548 | sbi->sb_root = le32_to_cpu(superblock->root); |
549 | sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); | |
550 | sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); | |
551 | sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); | |
552 | sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); | |
553 | sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); | |
1da177e4 LT |
554 | sbi->sb_uid = uid; |
555 | sbi->sb_gid = gid; | |
556 | sbi->sb_mode = 0777 & ~umask; | |
557 | sbi->sb_n_free = -1; | |
558 | sbi->sb_n_free_dnodes = -1; | |
559 | sbi->sb_lowercase = lowercase; | |
1da177e4 LT |
560 | sbi->sb_eas = eas; |
561 | sbi->sb_chk = chk; | |
562 | sbi->sb_chkdsk = chkdsk; | |
563 | sbi->sb_err = errs; | |
564 | sbi->sb_timeshift = timeshift; | |
565 | sbi->sb_was_error = 0; | |
566 | sbi->sb_cp_table = NULL; | |
567 | sbi->sb_c_bitmap = -1; | |
568 | sbi->sb_max_fwd_alloc = 0xffffff; | |
3ebacb05 MP |
569 | |
570 | if (sbi->sb_fs_size >= 0x80000000) { | |
571 | hpfs_error(s, "invalid size in superblock: %08x", | |
572 | (unsigned)sbi->sb_fs_size); | |
573 | goto bail4; | |
574 | } | |
575 | ||
1da177e4 | 576 | /* Load bitmap directory */ |
0b69760b | 577 | if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) |
1da177e4 LT |
578 | goto bail4; |
579 | ||
580 | /* Check for general fs errors*/ | |
581 | if (spareblock->dirty && !spareblock->old_wrote) { | |
582 | if (errs == 2) { | |
583 | printk("HPFS: Improperly stopped, not mounted\n"); | |
584 | goto bail4; | |
585 | } | |
586 | hpfs_error(s, "improperly stopped"); | |
587 | } | |
588 | ||
589 | if (!(s->s_flags & MS_RDONLY)) { | |
590 | spareblock->dirty = 1; | |
591 | spareblock->old_wrote = 0; | |
592 | mark_buffer_dirty(bh2); | |
593 | } | |
594 | ||
28fe3c19 | 595 | if (spareblock->hotfixes_used || spareblock->n_spares_used) { |
1da177e4 LT |
596 | if (errs >= 2) { |
597 | printk("HPFS: Hotfixes not supported here, try chkdsk\n"); | |
dab4c82a | 598 | mark_dirty(s, 0); |
1da177e4 LT |
599 | goto bail4; |
600 | } | |
601 | hpfs_error(s, "hotfixes not supported here, try chkdsk"); | |
602 | if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n"); | |
603 | else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n"); | |
604 | } | |
0b69760b | 605 | if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { |
1da177e4 LT |
606 | if (errs >= 2) { |
607 | printk("HPFS: Spare dnodes used, try chkdsk\n"); | |
dab4c82a | 608 | mark_dirty(s, 0); |
1da177e4 LT |
609 | goto bail4; |
610 | } | |
611 | hpfs_error(s, "warning: spare dnodes used, try chkdsk"); | |
612 | if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); | |
613 | } | |
614 | if (chk) { | |
615 | unsigned a; | |
0b69760b MP |
616 | if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || |
617 | le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { | |
1da177e4 | 618 | hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", |
0b69760b | 619 | le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); |
1da177e4 LT |
620 | goto bail4; |
621 | } | |
622 | a = sbi->sb_dirband_size; | |
623 | sbi->sb_dirband_size = 0; | |
0b69760b MP |
624 | if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || |
625 | hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || | |
626 | hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { | |
dab4c82a | 627 | mark_dirty(s, 0); |
1da177e4 LT |
628 | goto bail4; |
629 | } | |
630 | sbi->sb_dirband_size = a; | |
631 | } else printk("HPFS: You really don't want any checks? You are crazy...\n"); | |
632 | ||
633 | /* Load code page table */ | |
0b69760b MP |
634 | if (le32_to_cpu(spareblock->n_code_pages)) |
635 | if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) | |
1da177e4 LT |
636 | printk("HPFS: Warning: code page support is disabled\n"); |
637 | ||
638 | brelse(bh2); | |
639 | brelse(bh1); | |
640 | brelse(bh0); | |
641 | ||
642 | root = iget_locked(s, sbi->sb_root); | |
643 | if (!root) | |
644 | goto bail0; | |
645 | hpfs_init_inode(root); | |
646 | hpfs_read_inode(root); | |
647 | unlock_new_inode(root); | |
48fde701 AV |
648 | s->s_root = d_make_root(root); |
649 | if (!s->s_root) | |
1da177e4 | 650 | goto bail0; |
1da177e4 LT |
651 | |
652 | /* | |
653 | * find the root directory's . pointer & finish filling in the inode | |
654 | */ | |
655 | ||
656 | root_dno = hpfs_fnode_dno(s, sbi->sb_root); | |
657 | if (root_dno) | |
658 | de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); | |
659 | if (!de) | |
660 | hpfs_error(s, "unable to find root dir"); | |
661 | else { | |
0b69760b | 662 | root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); |
1da177e4 | 663 | root->i_atime.tv_nsec = 0; |
0b69760b | 664 | root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); |
1da177e4 | 665 | root->i_mtime.tv_nsec = 0; |
0b69760b | 666 | root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); |
1da177e4 | 667 | root->i_ctime.tv_nsec = 0; |
de5e2b36 | 668 | hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); |
1da177e4 LT |
669 | hpfs_i(root)->i_parent_dir = root->i_ino; |
670 | if (root->i_size == -1) | |
671 | root->i_size = 2048; | |
672 | if (root->i_blocks == -1) | |
673 | root->i_blocks = 5; | |
674 | hpfs_brelse4(&qbh); | |
675 | } | |
7dd29d8d | 676 | hpfs_unlock(s); |
1da177e4 LT |
677 | return 0; |
678 | ||
679 | bail4: brelse(bh2); | |
680 | bail3: brelse(bh1); | |
681 | bail2: brelse(bh0); | |
682 | bail1: | |
683 | bail0: | |
7dd29d8d | 684 | hpfs_unlock(s); |
30687e0a | 685 | free_sbi(sbi); |
1da177e4 LT |
686 | return -EINVAL; |
687 | } | |
688 | ||
152a0836 AV |
689 | static struct dentry *hpfs_mount(struct file_system_type *fs_type, |
690 | int flags, const char *dev_name, void *data) | |
1da177e4 | 691 | { |
152a0836 | 692 | return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); |
1da177e4 LT |
693 | } |
694 | ||
695 | static struct file_system_type hpfs_fs_type = { | |
696 | .owner = THIS_MODULE, | |
697 | .name = "hpfs", | |
152a0836 | 698 | .mount = hpfs_mount, |
1da177e4 LT |
699 | .kill_sb = kill_block_super, |
700 | .fs_flags = FS_REQUIRES_DEV, | |
701 | }; | |
3e64fe5b | 702 | MODULE_ALIAS_FS("hpfs"); |
1da177e4 LT |
703 | |
704 | static int __init init_hpfs_fs(void) | |
705 | { | |
706 | int err = init_inodecache(); | |
707 | if (err) | |
708 | goto out1; | |
709 | err = register_filesystem(&hpfs_fs_type); | |
710 | if (err) | |
711 | goto out; | |
712 | return 0; | |
713 | out: | |
714 | destroy_inodecache(); | |
715 | out1: | |
716 | return err; | |
717 | } | |
718 | ||
719 | static void __exit exit_hpfs_fs(void) | |
720 | { | |
721 | unregister_filesystem(&hpfs_fs_type); | |
722 | destroy_inodecache(); | |
723 | } | |
724 | ||
725 | module_init(init_hpfs_fs) | |
726 | module_exit(exit_hpfs_fs) | |
727 | MODULE_LICENSE("GPL"); |