Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/hpfs/super.c | |
4 | * | |
5 | * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 | |
6 | * | |
7 | * mounting, unmounting, error handling | |
8 | */ | |
9 | ||
10 | #include "hpfs_fn.h" | |
11 | #include <linux/module.h> | |
12 | #include <linux/parser.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/statfs.h> | |
e18fa700 | 15 | #include <linux/magic.h> |
e8edc6e0 | 16 | #include <linux/sched.h> |
f4c54fcf | 17 | #include <linux/bitmap.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
037369b8 | 19 | #include <linux/seq_file.h> |
1da177e4 LT |
20 | |
21 | /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ | |
22 | ||
dab4c82a | 23 | static void mark_dirty(struct super_block *s, int remount) |
1da177e4 | 24 | { |
bc98a42c | 25 | if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) { |
1da177e4 LT |
26 | struct buffer_head *bh; |
27 | struct hpfs_spare_block *sb; | |
28 | if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { | |
29 | sb->dirty = 1; | |
30 | sb->old_wrote = 0; | |
31 | mark_buffer_dirty(bh); | |
f7397681 | 32 | sync_dirty_buffer(bh); |
1da177e4 LT |
33 | brelse(bh); |
34 | } | |
35 | } | |
36 | } | |
37 | ||
38 | /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there | |
39 | were errors) */ | |
40 | ||
41 | static void unmark_dirty(struct super_block *s) | |
42 | { | |
43 | struct buffer_head *bh; | |
44 | struct hpfs_spare_block *sb; | |
bc98a42c | 45 | if (sb_rdonly(s)) return; |
f7397681 | 46 | sync_blockdev(s->s_bdev); |
1da177e4 LT |
47 | if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { |
48 | sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error; | |
49 | sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error; | |
50 | mark_buffer_dirty(bh); | |
f7397681 | 51 | sync_dirty_buffer(bh); |
1da177e4 LT |
52 | brelse(bh); |
53 | } | |
54 | } | |
55 | ||
56 | /* Filesystem error... */ | |
352d94d0 | 57 | void hpfs_error(struct super_block *s, const char *fmt, ...) |
1da177e4 | 58 | { |
a28e4b2b | 59 | struct va_format vaf; |
352d94d0 AD |
60 | va_list args; |
61 | ||
62 | va_start(args, fmt); | |
a28e4b2b JP |
63 | |
64 | vaf.fmt = fmt; | |
65 | vaf.va = &args; | |
66 | ||
67 | pr_err("filesystem error: %pV", &vaf); | |
68 | ||
352d94d0 AD |
69 | va_end(args); |
70 | ||
1da177e4 LT |
71 | if (!hpfs_sb(s)->sb_was_error) { |
72 | if (hpfs_sb(s)->sb_err == 2) { | |
b7cb1ce2 | 73 | pr_cont("; crashing the system because you wanted it\n"); |
dab4c82a | 74 | mark_dirty(s, 0); |
1da177e4 LT |
75 | panic("HPFS panic"); |
76 | } else if (hpfs_sb(s)->sb_err == 1) { | |
bc98a42c | 77 | if (sb_rdonly(s)) |
b7cb1ce2 | 78 | pr_cont("; already mounted read-only\n"); |
1da177e4 | 79 | else { |
b7cb1ce2 | 80 | pr_cont("; remounting read-only\n"); |
dab4c82a | 81 | mark_dirty(s, 0); |
1751e8a6 | 82 | s->s_flags |= SB_RDONLY; |
1da177e4 | 83 | } |
bc98a42c | 84 | } else if (sb_rdonly(s)) |
b7cb1ce2 FF |
85 | pr_cont("; going on - but anything won't be destroyed because it's read-only\n"); |
86 | else | |
87 | pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); | |
88 | } else | |
89 | pr_cont("\n"); | |
1da177e4 LT |
90 | hpfs_sb(s)->sb_was_error = 1; |
91 | } | |
92 | ||
93 | /* | |
94 | * A little trick to detect cycles in many hpfs structures and don't let the | |
95 | * kernel crash on corrupted filesystem. When first called, set c2 to 0. | |
96 | * | |
97 | * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories | |
98 | * nested each in other, chkdsk locked up happilly. | |
99 | */ | |
100 | ||
101 | int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, | |
102 | char *msg) | |
103 | { | |
104 | if (*c2 && *c1 == key) { | |
105 | hpfs_error(s, "cycle detected on key %08x in %s", key, msg); | |
106 | return 1; | |
107 | } | |
108 | (*c2)++; | |
109 | if (!((*c2 - 1) & *c2)) *c1 = key; | |
110 | return 0; | |
111 | } | |
112 | ||
30687e0a | 113 | static void free_sbi(struct hpfs_sb_info *sbi) |
1da177e4 | 114 | { |
30687e0a AV |
115 | kfree(sbi->sb_cp_table); |
116 | kfree(sbi->sb_bmp_dir); | |
117 | kfree(sbi); | |
118 | } | |
6cfd0148 | 119 | |
30687e0a AV |
120 | static void lazy_free_sbi(struct rcu_head *rcu) |
121 | { | |
122 | free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); | |
123 | } | |
124 | ||
125 | static void hpfs_put_super(struct super_block *s) | |
126 | { | |
7dd29d8d MP |
127 | hpfs_lock(s); |
128 | unmark_dirty(s); | |
129 | hpfs_unlock(s); | |
30687e0a | 130 | call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); |
1da177e4 LT |
131 | } |
132 | ||
2cbe5c76 | 133 | static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) |
1da177e4 LT |
134 | { |
135 | struct quad_buffer_head qbh; | |
f4c54fcf AM |
136 | unsigned long *bits; |
137 | unsigned count; | |
138 | ||
275f495d | 139 | bits = hpfs_map_4sectors(s, secno, &qbh, 0); |
f4c54fcf | 140 | if (!bits) |
2cbe5c76 | 141 | return (unsigned)-1; |
f4c54fcf | 142 | count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); |
1da177e4 LT |
143 | hpfs_brelse4(&qbh); |
144 | return count; | |
145 | } | |
146 | ||
147 | static unsigned count_bitmaps(struct super_block *s) | |
148 | { | |
149 | unsigned n, count, n_bands; | |
150 | n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; | |
151 | count = 0; | |
275f495d MP |
152 | for (n = 0; n < COUNT_RD_AHEAD; n++) { |
153 | hpfs_prefetch_bitmap(s, n); | |
154 | } | |
155 | for (n = 0; n < n_bands; n++) { | |
2cbe5c76 | 156 | unsigned c; |
275f495d | 157 | hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); |
2cbe5c76 MP |
158 | c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); |
159 | if (c != (unsigned)-1) | |
160 | count += c; | |
275f495d | 161 | } |
1da177e4 LT |
162 | return count; |
163 | } | |
164 | ||
2cbe5c76 MP |
165 | unsigned hpfs_get_free_dnodes(struct super_block *s) |
166 | { | |
167 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
168 | if (sbi->sb_n_free_dnodes == (unsigned)-1) { | |
169 | unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap); | |
170 | if (c == (unsigned)-1) | |
171 | return 0; | |
172 | sbi->sb_n_free_dnodes = c; | |
173 | } | |
174 | return sbi->sb_n_free_dnodes; | |
175 | } | |
176 | ||
726c3342 | 177 | static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 178 | { |
726c3342 | 179 | struct super_block *s = dentry->d_sb; |
1da177e4 | 180 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
604d295c | 181 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
2cbe5c76 | 182 | |
9a311b96 | 183 | hpfs_lock(s); |
1da177e4 | 184 | |
2cbe5c76 | 185 | if (sbi->sb_n_free == (unsigned)-1) |
1da177e4 | 186 | sbi->sb_n_free = count_bitmaps(s); |
2cbe5c76 | 187 | |
1da177e4 LT |
188 | buf->f_type = s->s_magic; |
189 | buf->f_bsize = 512; | |
190 | buf->f_blocks = sbi->sb_fs_size; | |
191 | buf->f_bfree = sbi->sb_n_free; | |
192 | buf->f_bavail = sbi->sb_n_free; | |
193 | buf->f_files = sbi->sb_dirband_size / 4; | |
2cbe5c76 | 194 | buf->f_ffree = hpfs_get_free_dnodes(s); |
6d1349c7 | 195 | buf->f_fsid = u64_to_fsid(id); |
1da177e4 LT |
196 | buf->f_namelen = 254; |
197 | ||
9a311b96 | 198 | hpfs_unlock(s); |
1da177e4 LT |
199 | |
200 | return 0; | |
201 | } | |
202 | ||
a27b5b97 MP |
203 | |
204 | long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
205 | { | |
206 | switch (cmd) { | |
207 | case FITRIM: { | |
208 | struct fstrim_range range; | |
209 | secno n_trimmed; | |
210 | int r; | |
211 | if (!capable(CAP_SYS_ADMIN)) | |
212 | return -EPERM; | |
213 | if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) | |
214 | return -EFAULT; | |
215 | r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed); | |
216 | if (r) | |
217 | return r; | |
218 | range.len = (u64)n_trimmed << 9; | |
219 | if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range))) | |
220 | return -EFAULT; | |
221 | return 0; | |
222 | } | |
223 | default: { | |
224 | return -ENOIOCTLCMD; | |
225 | } | |
226 | } | |
227 | } | |
228 | ||
229 | ||
e18b890b | 230 | static struct kmem_cache * hpfs_inode_cachep; |
1da177e4 LT |
231 | |
232 | static struct inode *hpfs_alloc_inode(struct super_block *sb) | |
233 | { | |
234 | struct hpfs_inode_info *ei; | |
fd60b288 | 235 | ei = alloc_inode_sb(sb, hpfs_inode_cachep, GFP_NOFS); |
1da177e4 LT |
236 | if (!ei) |
237 | return NULL; | |
1da177e4 LT |
238 | return &ei->vfs_inode; |
239 | } | |
240 | ||
4d436d5c | 241 | static void hpfs_free_inode(struct inode *inode) |
1da177e4 LT |
242 | { |
243 | kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); | |
244 | } | |
245 | ||
51cc5068 | 246 | static void init_once(void *foo) |
1da177e4 LT |
247 | { |
248 | struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; | |
249 | ||
a35afb83 | 250 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 251 | } |
20c2df83 | 252 | |
1da177e4 LT |
253 | static int init_inodecache(void) |
254 | { | |
255 | hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", | |
256 | sizeof(struct hpfs_inode_info), | |
fffb60f9 | 257 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 258 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 259 | init_once); |
1da177e4 LT |
260 | if (hpfs_inode_cachep == NULL) |
261 | return -ENOMEM; | |
262 | return 0; | |
263 | } | |
264 | ||
265 | static void destroy_inodecache(void) | |
266 | { | |
8c0a8537 KS |
267 | /* |
268 | * Make sure all delayed rcu free inodes are flushed before we | |
269 | * destroy cache. | |
270 | */ | |
271 | rcu_barrier(); | |
1a1d92c1 | 272 | kmem_cache_destroy(hpfs_inode_cachep); |
1da177e4 LT |
273 | } |
274 | ||
275 | /* | |
276 | * A tiny parser for option strings, stolen from dosfs. | |
277 | * Stolen again from read-only hpfs. | |
278 | * And updated for table-driven option parsing. | |
279 | */ | |
280 | ||
281 | enum { | |
282 | Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, | |
1da177e4 LT |
283 | Opt_check_none, Opt_check_normal, Opt_check_strict, |
284 | Opt_err_cont, Opt_err_ro, Opt_err_panic, | |
285 | Opt_eas_no, Opt_eas_ro, Opt_eas_rw, | |
286 | Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, | |
287 | Opt_timeshift, Opt_err, | |
288 | }; | |
289 | ||
a447c093 | 290 | static const match_table_t tokens = { |
1da177e4 LT |
291 | {Opt_help, "help"}, |
292 | {Opt_uid, "uid=%u"}, | |
293 | {Opt_gid, "gid=%u"}, | |
294 | {Opt_umask, "umask=%o"}, | |
295 | {Opt_case_lower, "case=lower"}, | |
296 | {Opt_case_asis, "case=asis"}, | |
1da177e4 LT |
297 | {Opt_check_none, "check=none"}, |
298 | {Opt_check_normal, "check=normal"}, | |
299 | {Opt_check_strict, "check=strict"}, | |
300 | {Opt_err_cont, "errors=continue"}, | |
301 | {Opt_err_ro, "errors=remount-ro"}, | |
302 | {Opt_err_panic, "errors=panic"}, | |
303 | {Opt_eas_no, "eas=no"}, | |
304 | {Opt_eas_ro, "eas=ro"}, | |
305 | {Opt_eas_rw, "eas=rw"}, | |
306 | {Opt_chkdsk_no, "chkdsk=no"}, | |
307 | {Opt_chkdsk_errors, "chkdsk=errors"}, | |
308 | {Opt_chkdsk_always, "chkdsk=always"}, | |
309 | {Opt_timeshift, "timeshift=%d"}, | |
310 | {Opt_err, NULL}, | |
311 | }; | |
312 | ||
0e1a43c7 | 313 | static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, |
0fe105aa | 314 | int *lowercase, int *eas, int *chk, int *errs, |
1da177e4 LT |
315 | int *chkdsk, int *timeshift) |
316 | { | |
317 | char *p; | |
318 | int option; | |
319 | ||
320 | if (!opts) | |
321 | return 1; | |
322 | ||
b7cb1ce2 | 323 | /*pr_info("Parsing opts: '%s'\n",opts);*/ |
1da177e4 LT |
324 | |
325 | while ((p = strsep(&opts, ",")) != NULL) { | |
326 | substring_t args[MAX_OPT_ARGS]; | |
327 | int token; | |
328 | if (!*p) | |
329 | continue; | |
330 | ||
331 | token = match_token(p, tokens, args); | |
332 | switch (token) { | |
333 | case Opt_help: | |
334 | return 2; | |
335 | case Opt_uid: | |
336 | if (match_int(args, &option)) | |
337 | return 0; | |
0e1a43c7 EB |
338 | *uid = make_kuid(current_user_ns(), option); |
339 | if (!uid_valid(*uid)) | |
340 | return 0; | |
1da177e4 LT |
341 | break; |
342 | case Opt_gid: | |
343 | if (match_int(args, &option)) | |
344 | return 0; | |
0e1a43c7 EB |
345 | *gid = make_kgid(current_user_ns(), option); |
346 | if (!gid_valid(*gid)) | |
347 | return 0; | |
1da177e4 LT |
348 | break; |
349 | case Opt_umask: | |
350 | if (match_octal(args, &option)) | |
351 | return 0; | |
352 | *umask = option; | |
353 | break; | |
354 | case Opt_case_lower: | |
355 | *lowercase = 1; | |
356 | break; | |
357 | case Opt_case_asis: | |
358 | *lowercase = 0; | |
359 | break; | |
1da177e4 LT |
360 | case Opt_check_none: |
361 | *chk = 0; | |
362 | break; | |
363 | case Opt_check_normal: | |
364 | *chk = 1; | |
365 | break; | |
366 | case Opt_check_strict: | |
367 | *chk = 2; | |
368 | break; | |
369 | case Opt_err_cont: | |
370 | *errs = 0; | |
371 | break; | |
372 | case Opt_err_ro: | |
373 | *errs = 1; | |
374 | break; | |
375 | case Opt_err_panic: | |
376 | *errs = 2; | |
377 | break; | |
378 | case Opt_eas_no: | |
379 | *eas = 0; | |
380 | break; | |
381 | case Opt_eas_ro: | |
382 | *eas = 1; | |
383 | break; | |
384 | case Opt_eas_rw: | |
385 | *eas = 2; | |
386 | break; | |
387 | case Opt_chkdsk_no: | |
388 | *chkdsk = 0; | |
389 | break; | |
390 | case Opt_chkdsk_errors: | |
391 | *chkdsk = 1; | |
392 | break; | |
393 | case Opt_chkdsk_always: | |
394 | *chkdsk = 2; | |
395 | break; | |
396 | case Opt_timeshift: | |
397 | { | |
398 | int m = 1; | |
399 | char *rhs = args[0].from; | |
400 | if (!rhs || !*rhs) | |
401 | return 0; | |
402 | if (*rhs == '-') m = -1; | |
403 | if (*rhs == '+' || *rhs == '-') rhs++; | |
404 | *timeshift = simple_strtoul(rhs, &rhs, 0) * m; | |
405 | if (*rhs) | |
406 | return 0; | |
407 | break; | |
408 | } | |
409 | default: | |
410 | return 0; | |
411 | } | |
412 | } | |
413 | return 1; | |
414 | } | |
415 | ||
416 | static inline void hpfs_help(void) | |
417 | { | |
b7cb1ce2 | 418 | pr_info("\n\ |
1da177e4 LT |
419 | HPFS filesystem options:\n\ |
420 | help do not mount and display this text\n\ | |
421 | uid=xxx set uid of files that don't have uid specified in eas\n\ | |
422 | gid=xxx set gid of files that don't have gid specified in eas\n\ | |
423 | umask=xxx set mode of files that don't have mode specified in eas\n\ | |
424 | case=lower lowercase all files\n\ | |
425 | case=asis do not lowercase files (default)\n\ | |
1da177e4 LT |
426 | check=none no fs checks - kernel may crash on corrupted filesystem\n\ |
427 | check=normal do some checks - it should not crash (default)\n\ | |
428 | check=strict do extra time-consuming checks, used for debugging\n\ | |
429 | errors=continue continue on errors\n\ | |
430 | errors=remount-ro remount read-only if errors found (default)\n\ | |
431 | errors=panic panic on errors\n\ | |
432 | chkdsk=no do not mark fs for chkdsking even if there were errors\n\ | |
433 | chkdsk=errors mark fs dirty if errors found (default)\n\ | |
434 | chkdsk=always always mark fs dirty - used for debugging\n\ | |
435 | eas=no ignore extended attributes\n\ | |
436 | eas=ro read but do not write extended attributes\n\ | |
437 | eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ | |
438 | timeshift=nnn add nnn seconds to file times\n\ | |
439 | \n"); | |
440 | } | |
441 | ||
442 | static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) | |
443 | { | |
0e1a43c7 EB |
444 | kuid_t uid; |
445 | kgid_t gid; | |
1da177e4 | 446 | umode_t umask; |
0fe105aa | 447 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
448 | int o; |
449 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
ce657611 | 450 | |
02b9984d TT |
451 | sync_filesystem(s); |
452 | ||
1751e8a6 | 453 | *flags |= SB_NOATIME; |
ce657611 | 454 | |
9a311b96 | 455 | hpfs_lock(s); |
1da177e4 LT |
456 | uid = sbi->sb_uid; gid = sbi->sb_gid; |
457 | umask = 0777 & ~sbi->sb_mode; | |
0fe105aa | 458 | lowercase = sbi->sb_lowercase; |
1da177e4 LT |
459 | eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; |
460 | errs = sbi->sb_err; timeshift = sbi->sb_timeshift; | |
461 | ||
0fe105aa | 462 | if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, |
1da177e4 | 463 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 464 | pr_err("bad mount options.\n"); |
6d9c1fd4 | 465 | goto out_err; |
1da177e4 LT |
466 | } |
467 | if (o == 2) { | |
468 | hpfs_help(); | |
6d9c1fd4 | 469 | goto out_err; |
1da177e4 LT |
470 | } |
471 | if (timeshift != sbi->sb_timeshift) { | |
a19189e5 | 472 | pr_err("timeshift can't be changed using remount.\n"); |
6d9c1fd4 | 473 | goto out_err; |
1da177e4 LT |
474 | } |
475 | ||
476 | unmark_dirty(s); | |
477 | ||
478 | sbi->sb_uid = uid; sbi->sb_gid = gid; | |
479 | sbi->sb_mode = 0777 & ~umask; | |
0fe105aa | 480 | sbi->sb_lowercase = lowercase; |
1da177e4 LT |
481 | sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; |
482 | sbi->sb_err = errs; sbi->sb_timeshift = timeshift; | |
483 | ||
1751e8a6 | 484 | if (!(*flags & SB_RDONLY)) mark_dirty(s, 1); |
1da177e4 | 485 | |
9a311b96 | 486 | hpfs_unlock(s); |
1da177e4 | 487 | return 0; |
6d9c1fd4 MS |
488 | |
489 | out_err: | |
9a311b96 | 490 | hpfs_unlock(s); |
6d9c1fd4 | 491 | return -EINVAL; |
1da177e4 LT |
492 | } |
493 | ||
037369b8 MP |
494 | static int hpfs_show_options(struct seq_file *seq, struct dentry *root) |
495 | { | |
496 | struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb); | |
497 | ||
498 | seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid)); | |
499 | seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid)); | |
500 | seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777)); | |
501 | if (sbi->sb_lowercase) | |
502 | seq_printf(seq, ",case=lower"); | |
503 | if (!sbi->sb_chk) | |
504 | seq_printf(seq, ",check=none"); | |
505 | if (sbi->sb_chk == 2) | |
506 | seq_printf(seq, ",check=strict"); | |
507 | if (!sbi->sb_err) | |
508 | seq_printf(seq, ",errors=continue"); | |
509 | if (sbi->sb_err == 2) | |
510 | seq_printf(seq, ",errors=panic"); | |
511 | if (!sbi->sb_chkdsk) | |
512 | seq_printf(seq, ",chkdsk=no"); | |
513 | if (sbi->sb_chkdsk == 2) | |
514 | seq_printf(seq, ",chkdsk=always"); | |
515 | if (!sbi->sb_eas) | |
516 | seq_printf(seq, ",eas=no"); | |
517 | if (sbi->sb_eas == 1) | |
518 | seq_printf(seq, ",eas=ro"); | |
519 | if (sbi->sb_timeshift) | |
520 | seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift); | |
521 | return 0; | |
522 | } | |
523 | ||
1da177e4 LT |
524 | /* Super operations */ |
525 | ||
ee9b6d61 | 526 | static const struct super_operations hpfs_sops = |
1da177e4 LT |
527 | { |
528 | .alloc_inode = hpfs_alloc_inode, | |
4d436d5c | 529 | .free_inode = hpfs_free_inode, |
ea544009 | 530 | .evict_inode = hpfs_evict_inode, |
1da177e4 LT |
531 | .put_super = hpfs_put_super, |
532 | .statfs = hpfs_statfs, | |
533 | .remount_fs = hpfs_remount_fs, | |
037369b8 | 534 | .show_options = hpfs_show_options, |
1da177e4 LT |
535 | }; |
536 | ||
537 | static int hpfs_fill_super(struct super_block *s, void *options, int silent) | |
538 | { | |
539 | struct buffer_head *bh0, *bh1, *bh2; | |
540 | struct hpfs_boot_block *bootblock; | |
541 | struct hpfs_super_block *superblock; | |
542 | struct hpfs_spare_block *spareblock; | |
543 | struct hpfs_sb_info *sbi; | |
544 | struct inode *root; | |
545 | ||
0e1a43c7 EB |
546 | kuid_t uid; |
547 | kgid_t gid; | |
1da177e4 | 548 | umode_t umask; |
0fe105aa | 549 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
550 | |
551 | dnode_secno root_dno; | |
552 | struct hpfs_dirent *de = NULL; | |
553 | struct quad_buffer_head qbh; | |
554 | ||
555 | int o; | |
556 | ||
f8314dc6 | 557 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
db719222 | 558 | if (!sbi) { |
1da177e4 | 559 | return -ENOMEM; |
db719222 | 560 | } |
1da177e4 | 561 | s->s_fs_info = sbi; |
1da177e4 | 562 | |
7dd29d8d MP |
563 | mutex_init(&sbi->hpfs_mutex); |
564 | hpfs_lock(s); | |
565 | ||
de395b8a DH |
566 | uid = current_uid(); |
567 | gid = current_gid(); | |
ce3b0f8d | 568 | umask = current_umask(); |
1da177e4 | 569 | lowercase = 0; |
1da177e4 LT |
570 | eas = 2; |
571 | chk = 1; | |
572 | errs = 1; | |
573 | chkdsk = 1; | |
574 | timeshift = 0; | |
575 | ||
0fe105aa | 576 | if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, |
1da177e4 | 577 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 578 | pr_err("bad mount options.\n"); |
1da177e4 LT |
579 | goto bail0; |
580 | } | |
581 | if (o==2) { | |
582 | hpfs_help(); | |
583 | goto bail0; | |
584 | } | |
585 | ||
586 | /*sbi->sb_mounting = 1;*/ | |
587 | sb_set_blocksize(s, 512); | |
588 | sbi->sb_fs_size = -1; | |
589 | if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; | |
590 | if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; | |
591 | if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; | |
592 | ||
593 | /* Check magics */ | |
0b69760b MP |
594 | if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC |
595 | ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC | |
596 | || le32_to_cpu(spareblock->magic) != SP_MAGIC) { | |
b7cb1ce2 | 597 | if (!silent) |
a19189e5 | 598 | pr_err("Bad magic ... probably not HPFS\n"); |
1da177e4 LT |
599 | goto bail4; |
600 | } | |
601 | ||
602 | /* Check version */ | |
bc98a42c | 603 | if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) { |
a19189e5 | 604 | pr_err("Bad version %d,%d. Mount readonly to go around\n", |
1da177e4 | 605 | (int)superblock->version, (int)superblock->funcversion); |
a19189e5 | 606 | pr_err("please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n"); |
1da177e4 LT |
607 | goto bail4; |
608 | } | |
609 | ||
1751e8a6 | 610 | s->s_flags |= SB_NOATIME; |
1da177e4 LT |
611 | |
612 | /* Fill superblock stuff */ | |
613 | s->s_magic = HPFS_SUPER_MAGIC; | |
614 | s->s_op = &hpfs_sops; | |
43d344d7 | 615 | s->s_d_op = &hpfs_dentry_operations; |
cdd62b5b DD |
616 | s->s_time_min = local_to_gmt(s, 0); |
617 | s->s_time_max = local_to_gmt(s, U32_MAX); | |
1da177e4 | 618 | |
0b69760b MP |
619 | sbi->sb_root = le32_to_cpu(superblock->root); |
620 | sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); | |
621 | sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); | |
622 | sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); | |
623 | sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); | |
624 | sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); | |
1da177e4 LT |
625 | sbi->sb_uid = uid; |
626 | sbi->sb_gid = gid; | |
627 | sbi->sb_mode = 0777 & ~umask; | |
628 | sbi->sb_n_free = -1; | |
629 | sbi->sb_n_free_dnodes = -1; | |
630 | sbi->sb_lowercase = lowercase; | |
1da177e4 LT |
631 | sbi->sb_eas = eas; |
632 | sbi->sb_chk = chk; | |
633 | sbi->sb_chkdsk = chkdsk; | |
634 | sbi->sb_err = errs; | |
635 | sbi->sb_timeshift = timeshift; | |
636 | sbi->sb_was_error = 0; | |
637 | sbi->sb_cp_table = NULL; | |
638 | sbi->sb_c_bitmap = -1; | |
639 | sbi->sb_max_fwd_alloc = 0xffffff; | |
3ebacb05 MP |
640 | |
641 | if (sbi->sb_fs_size >= 0x80000000) { | |
642 | hpfs_error(s, "invalid size in superblock: %08x", | |
643 | (unsigned)sbi->sb_fs_size); | |
644 | goto bail4; | |
645 | } | |
646 | ||
a64eefaa MP |
647 | if (spareblock->n_spares_used) |
648 | hpfs_load_hotfix_map(s, spareblock); | |
649 | ||
1da177e4 | 650 | /* Load bitmap directory */ |
0b69760b | 651 | if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) |
1da177e4 LT |
652 | goto bail4; |
653 | ||
654 | /* Check for general fs errors*/ | |
655 | if (spareblock->dirty && !spareblock->old_wrote) { | |
656 | if (errs == 2) { | |
a19189e5 | 657 | pr_err("Improperly stopped, not mounted\n"); |
1da177e4 LT |
658 | goto bail4; |
659 | } | |
660 | hpfs_error(s, "improperly stopped"); | |
661 | } | |
662 | ||
bc98a42c | 663 | if (!sb_rdonly(s)) { |
1da177e4 LT |
664 | spareblock->dirty = 1; |
665 | spareblock->old_wrote = 0; | |
666 | mark_buffer_dirty(bh2); | |
667 | } | |
668 | ||
0b69760b | 669 | if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { |
1da177e4 | 670 | if (errs >= 2) { |
a19189e5 | 671 | pr_err("Spare dnodes used, try chkdsk\n"); |
dab4c82a | 672 | mark_dirty(s, 0); |
1da177e4 LT |
673 | goto bail4; |
674 | } | |
675 | hpfs_error(s, "warning: spare dnodes used, try chkdsk"); | |
b7cb1ce2 | 676 | if (errs == 0) |
a19189e5 | 677 | pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); |
1da177e4 LT |
678 | } |
679 | if (chk) { | |
680 | unsigned a; | |
0b69760b MP |
681 | if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || |
682 | le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { | |
1da177e4 | 683 | hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", |
0b69760b | 684 | le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); |
1da177e4 LT |
685 | goto bail4; |
686 | } | |
687 | a = sbi->sb_dirband_size; | |
688 | sbi->sb_dirband_size = 0; | |
0b69760b MP |
689 | if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || |
690 | hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || | |
691 | hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { | |
dab4c82a | 692 | mark_dirty(s, 0); |
1da177e4 LT |
693 | goto bail4; |
694 | } | |
695 | sbi->sb_dirband_size = a; | |
b7cb1ce2 | 696 | } else |
a19189e5 | 697 | pr_err("You really don't want any checks? You are crazy...\n"); |
1da177e4 LT |
698 | |
699 | /* Load code page table */ | |
0b69760b MP |
700 | if (le32_to_cpu(spareblock->n_code_pages)) |
701 | if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) | |
a19189e5 | 702 | pr_err("code page support is disabled\n"); |
1da177e4 LT |
703 | |
704 | brelse(bh2); | |
705 | brelse(bh1); | |
706 | brelse(bh0); | |
707 | ||
708 | root = iget_locked(s, sbi->sb_root); | |
709 | if (!root) | |
710 | goto bail0; | |
711 | hpfs_init_inode(root); | |
712 | hpfs_read_inode(root); | |
713 | unlock_new_inode(root); | |
48fde701 AV |
714 | s->s_root = d_make_root(root); |
715 | if (!s->s_root) | |
1da177e4 | 716 | goto bail0; |
1da177e4 LT |
717 | |
718 | /* | |
719 | * find the root directory's . pointer & finish filling in the inode | |
720 | */ | |
721 | ||
722 | root_dno = hpfs_fnode_dno(s, sbi->sb_root); | |
723 | if (root_dno) | |
724 | de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); | |
725 | if (!de) | |
726 | hpfs_error(s, "unable to find root dir"); | |
727 | else { | |
0b69760b | 728 | root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); |
1da177e4 | 729 | root->i_atime.tv_nsec = 0; |
0b69760b | 730 | root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); |
1da177e4 | 731 | root->i_mtime.tv_nsec = 0; |
0b69760b | 732 | root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); |
1da177e4 | 733 | root->i_ctime.tv_nsec = 0; |
de5e2b36 | 734 | hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); |
1da177e4 LT |
735 | hpfs_i(root)->i_parent_dir = root->i_ino; |
736 | if (root->i_size == -1) | |
737 | root->i_size = 2048; | |
738 | if (root->i_blocks == -1) | |
739 | root->i_blocks = 5; | |
740 | hpfs_brelse4(&qbh); | |
741 | } | |
7dd29d8d | 742 | hpfs_unlock(s); |
1da177e4 LT |
743 | return 0; |
744 | ||
745 | bail4: brelse(bh2); | |
746 | bail3: brelse(bh1); | |
747 | bail2: brelse(bh0); | |
748 | bail1: | |
749 | bail0: | |
7dd29d8d | 750 | hpfs_unlock(s); |
30687e0a | 751 | free_sbi(sbi); |
1da177e4 LT |
752 | return -EINVAL; |
753 | } | |
754 | ||
152a0836 AV |
755 | static struct dentry *hpfs_mount(struct file_system_type *fs_type, |
756 | int flags, const char *dev_name, void *data) | |
1da177e4 | 757 | { |
152a0836 | 758 | return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); |
1da177e4 LT |
759 | } |
760 | ||
761 | static struct file_system_type hpfs_fs_type = { | |
762 | .owner = THIS_MODULE, | |
763 | .name = "hpfs", | |
152a0836 | 764 | .mount = hpfs_mount, |
1da177e4 LT |
765 | .kill_sb = kill_block_super, |
766 | .fs_flags = FS_REQUIRES_DEV, | |
767 | }; | |
3e64fe5b | 768 | MODULE_ALIAS_FS("hpfs"); |
1da177e4 LT |
769 | |
770 | static int __init init_hpfs_fs(void) | |
771 | { | |
772 | int err = init_inodecache(); | |
773 | if (err) | |
774 | goto out1; | |
775 | err = register_filesystem(&hpfs_fs_type); | |
776 | if (err) | |
777 | goto out; | |
778 | return 0; | |
779 | out: | |
780 | destroy_inodecache(); | |
781 | out1: | |
782 | return err; | |
783 | } | |
784 | ||
785 | static void __exit exit_hpfs_fs(void) | |
786 | { | |
787 | unregister_filesystem(&hpfs_fs_type); | |
788 | destroy_inodecache(); | |
789 | } | |
790 | ||
791 | module_init(init_hpfs_fs) | |
792 | module_exit(exit_hpfs_fs) | |
793 | MODULE_LICENSE("GPL"); |