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Commit | Line | Data |
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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); |
604d295c CL |
195 | buf->f_fsid.val[0] = (u32)id; |
196 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
197 | buf->f_namelen = 254; |
198 | ||
9a311b96 | 199 | hpfs_unlock(s); |
1da177e4 LT |
200 | |
201 | return 0; | |
202 | } | |
203 | ||
a27b5b97 MP |
204 | |
205 | long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
206 | { | |
207 | switch (cmd) { | |
208 | case FITRIM: { | |
209 | struct fstrim_range range; | |
210 | secno n_trimmed; | |
211 | int r; | |
212 | if (!capable(CAP_SYS_ADMIN)) | |
213 | return -EPERM; | |
214 | if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) | |
215 | return -EFAULT; | |
216 | r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed); | |
217 | if (r) | |
218 | return r; | |
219 | range.len = (u64)n_trimmed << 9; | |
220 | if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range))) | |
221 | return -EFAULT; | |
222 | return 0; | |
223 | } | |
224 | default: { | |
225 | return -ENOIOCTLCMD; | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
230 | ||
e18b890b | 231 | static struct kmem_cache * hpfs_inode_cachep; |
1da177e4 LT |
232 | |
233 | static struct inode *hpfs_alloc_inode(struct super_block *sb) | |
234 | { | |
235 | struct hpfs_inode_info *ei; | |
d7b04097 | 236 | ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); |
1da177e4 LT |
237 | if (!ei) |
238 | return NULL; | |
1da177e4 LT |
239 | return &ei->vfs_inode; |
240 | } | |
241 | ||
4d436d5c | 242 | static void hpfs_free_inode(struct inode *inode) |
1da177e4 LT |
243 | { |
244 | kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); | |
245 | } | |
246 | ||
51cc5068 | 247 | static void init_once(void *foo) |
1da177e4 LT |
248 | { |
249 | struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; | |
250 | ||
a35afb83 | 251 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 252 | } |
20c2df83 | 253 | |
1da177e4 LT |
254 | static int init_inodecache(void) |
255 | { | |
256 | hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", | |
257 | sizeof(struct hpfs_inode_info), | |
fffb60f9 | 258 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 259 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 260 | init_once); |
1da177e4 LT |
261 | if (hpfs_inode_cachep == NULL) |
262 | return -ENOMEM; | |
263 | return 0; | |
264 | } | |
265 | ||
266 | static void destroy_inodecache(void) | |
267 | { | |
8c0a8537 KS |
268 | /* |
269 | * Make sure all delayed rcu free inodes are flushed before we | |
270 | * destroy cache. | |
271 | */ | |
272 | rcu_barrier(); | |
1a1d92c1 | 273 | kmem_cache_destroy(hpfs_inode_cachep); |
1da177e4 LT |
274 | } |
275 | ||
276 | /* | |
277 | * A tiny parser for option strings, stolen from dosfs. | |
278 | * Stolen again from read-only hpfs. | |
279 | * And updated for table-driven option parsing. | |
280 | */ | |
281 | ||
282 | enum { | |
283 | Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, | |
1da177e4 LT |
284 | Opt_check_none, Opt_check_normal, Opt_check_strict, |
285 | Opt_err_cont, Opt_err_ro, Opt_err_panic, | |
286 | Opt_eas_no, Opt_eas_ro, Opt_eas_rw, | |
287 | Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, | |
288 | Opt_timeshift, Opt_err, | |
289 | }; | |
290 | ||
a447c093 | 291 | static const match_table_t tokens = { |
1da177e4 LT |
292 | {Opt_help, "help"}, |
293 | {Opt_uid, "uid=%u"}, | |
294 | {Opt_gid, "gid=%u"}, | |
295 | {Opt_umask, "umask=%o"}, | |
296 | {Opt_case_lower, "case=lower"}, | |
297 | {Opt_case_asis, "case=asis"}, | |
1da177e4 LT |
298 | {Opt_check_none, "check=none"}, |
299 | {Opt_check_normal, "check=normal"}, | |
300 | {Opt_check_strict, "check=strict"}, | |
301 | {Opt_err_cont, "errors=continue"}, | |
302 | {Opt_err_ro, "errors=remount-ro"}, | |
303 | {Opt_err_panic, "errors=panic"}, | |
304 | {Opt_eas_no, "eas=no"}, | |
305 | {Opt_eas_ro, "eas=ro"}, | |
306 | {Opt_eas_rw, "eas=rw"}, | |
307 | {Opt_chkdsk_no, "chkdsk=no"}, | |
308 | {Opt_chkdsk_errors, "chkdsk=errors"}, | |
309 | {Opt_chkdsk_always, "chkdsk=always"}, | |
310 | {Opt_timeshift, "timeshift=%d"}, | |
311 | {Opt_err, NULL}, | |
312 | }; | |
313 | ||
0e1a43c7 | 314 | static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, |
0fe105aa | 315 | int *lowercase, int *eas, int *chk, int *errs, |
1da177e4 LT |
316 | int *chkdsk, int *timeshift) |
317 | { | |
318 | char *p; | |
319 | int option; | |
320 | ||
321 | if (!opts) | |
322 | return 1; | |
323 | ||
b7cb1ce2 | 324 | /*pr_info("Parsing opts: '%s'\n",opts);*/ |
1da177e4 LT |
325 | |
326 | while ((p = strsep(&opts, ",")) != NULL) { | |
327 | substring_t args[MAX_OPT_ARGS]; | |
328 | int token; | |
329 | if (!*p) | |
330 | continue; | |
331 | ||
332 | token = match_token(p, tokens, args); | |
333 | switch (token) { | |
334 | case Opt_help: | |
335 | return 2; | |
336 | case Opt_uid: | |
337 | if (match_int(args, &option)) | |
338 | return 0; | |
0e1a43c7 EB |
339 | *uid = make_kuid(current_user_ns(), option); |
340 | if (!uid_valid(*uid)) | |
341 | return 0; | |
1da177e4 LT |
342 | break; |
343 | case Opt_gid: | |
344 | if (match_int(args, &option)) | |
345 | return 0; | |
0e1a43c7 EB |
346 | *gid = make_kgid(current_user_ns(), option); |
347 | if (!gid_valid(*gid)) | |
348 | return 0; | |
1da177e4 LT |
349 | break; |
350 | case Opt_umask: | |
351 | if (match_octal(args, &option)) | |
352 | return 0; | |
353 | *umask = option; | |
354 | break; | |
355 | case Opt_case_lower: | |
356 | *lowercase = 1; | |
357 | break; | |
358 | case Opt_case_asis: | |
359 | *lowercase = 0; | |
360 | break; | |
1da177e4 LT |
361 | case Opt_check_none: |
362 | *chk = 0; | |
363 | break; | |
364 | case Opt_check_normal: | |
365 | *chk = 1; | |
366 | break; | |
367 | case Opt_check_strict: | |
368 | *chk = 2; | |
369 | break; | |
370 | case Opt_err_cont: | |
371 | *errs = 0; | |
372 | break; | |
373 | case Opt_err_ro: | |
374 | *errs = 1; | |
375 | break; | |
376 | case Opt_err_panic: | |
377 | *errs = 2; | |
378 | break; | |
379 | case Opt_eas_no: | |
380 | *eas = 0; | |
381 | break; | |
382 | case Opt_eas_ro: | |
383 | *eas = 1; | |
384 | break; | |
385 | case Opt_eas_rw: | |
386 | *eas = 2; | |
387 | break; | |
388 | case Opt_chkdsk_no: | |
389 | *chkdsk = 0; | |
390 | break; | |
391 | case Opt_chkdsk_errors: | |
392 | *chkdsk = 1; | |
393 | break; | |
394 | case Opt_chkdsk_always: | |
395 | *chkdsk = 2; | |
396 | break; | |
397 | case Opt_timeshift: | |
398 | { | |
399 | int m = 1; | |
400 | char *rhs = args[0].from; | |
401 | if (!rhs || !*rhs) | |
402 | return 0; | |
403 | if (*rhs == '-') m = -1; | |
404 | if (*rhs == '+' || *rhs == '-') rhs++; | |
405 | *timeshift = simple_strtoul(rhs, &rhs, 0) * m; | |
406 | if (*rhs) | |
407 | return 0; | |
408 | break; | |
409 | } | |
410 | default: | |
411 | return 0; | |
412 | } | |
413 | } | |
414 | return 1; | |
415 | } | |
416 | ||
417 | static inline void hpfs_help(void) | |
418 | { | |
b7cb1ce2 | 419 | pr_info("\n\ |
1da177e4 LT |
420 | HPFS filesystem options:\n\ |
421 | help do not mount and display this text\n\ | |
422 | uid=xxx set uid of files that don't have uid specified in eas\n\ | |
423 | gid=xxx set gid of files that don't have gid specified in eas\n\ | |
424 | umask=xxx set mode of files that don't have mode specified in eas\n\ | |
425 | case=lower lowercase all files\n\ | |
426 | case=asis do not lowercase files (default)\n\ | |
1da177e4 LT |
427 | check=none no fs checks - kernel may crash on corrupted filesystem\n\ |
428 | check=normal do some checks - it should not crash (default)\n\ | |
429 | check=strict do extra time-consuming checks, used for debugging\n\ | |
430 | errors=continue continue on errors\n\ | |
431 | errors=remount-ro remount read-only if errors found (default)\n\ | |
432 | errors=panic panic on errors\n\ | |
433 | chkdsk=no do not mark fs for chkdsking even if there were errors\n\ | |
434 | chkdsk=errors mark fs dirty if errors found (default)\n\ | |
435 | chkdsk=always always mark fs dirty - used for debugging\n\ | |
436 | eas=no ignore extended attributes\n\ | |
437 | eas=ro read but do not write extended attributes\n\ | |
438 | eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ | |
439 | timeshift=nnn add nnn seconds to file times\n\ | |
440 | \n"); | |
441 | } | |
442 | ||
443 | static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) | |
444 | { | |
0e1a43c7 EB |
445 | kuid_t uid; |
446 | kgid_t gid; | |
1da177e4 | 447 | umode_t umask; |
0fe105aa | 448 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
449 | int o; |
450 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
ce657611 | 451 | |
02b9984d TT |
452 | sync_filesystem(s); |
453 | ||
1751e8a6 | 454 | *flags |= SB_NOATIME; |
ce657611 | 455 | |
9a311b96 | 456 | hpfs_lock(s); |
1da177e4 LT |
457 | uid = sbi->sb_uid; gid = sbi->sb_gid; |
458 | umask = 0777 & ~sbi->sb_mode; | |
0fe105aa | 459 | lowercase = sbi->sb_lowercase; |
1da177e4 LT |
460 | eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; |
461 | errs = sbi->sb_err; timeshift = sbi->sb_timeshift; | |
462 | ||
0fe105aa | 463 | if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, |
1da177e4 | 464 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 465 | pr_err("bad mount options.\n"); |
6d9c1fd4 | 466 | goto out_err; |
1da177e4 LT |
467 | } |
468 | if (o == 2) { | |
469 | hpfs_help(); | |
6d9c1fd4 | 470 | goto out_err; |
1da177e4 LT |
471 | } |
472 | if (timeshift != sbi->sb_timeshift) { | |
a19189e5 | 473 | pr_err("timeshift can't be changed using remount.\n"); |
6d9c1fd4 | 474 | goto out_err; |
1da177e4 LT |
475 | } |
476 | ||
477 | unmark_dirty(s); | |
478 | ||
479 | sbi->sb_uid = uid; sbi->sb_gid = gid; | |
480 | sbi->sb_mode = 0777 & ~umask; | |
0fe105aa | 481 | sbi->sb_lowercase = lowercase; |
1da177e4 LT |
482 | sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; |
483 | sbi->sb_err = errs; sbi->sb_timeshift = timeshift; | |
484 | ||
1751e8a6 | 485 | if (!(*flags & SB_RDONLY)) mark_dirty(s, 1); |
1da177e4 | 486 | |
9a311b96 | 487 | hpfs_unlock(s); |
1da177e4 | 488 | return 0; |
6d9c1fd4 MS |
489 | |
490 | out_err: | |
9a311b96 | 491 | hpfs_unlock(s); |
6d9c1fd4 | 492 | return -EINVAL; |
1da177e4 LT |
493 | } |
494 | ||
037369b8 MP |
495 | static int hpfs_show_options(struct seq_file *seq, struct dentry *root) |
496 | { | |
497 | struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb); | |
498 | ||
499 | seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid)); | |
500 | seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid)); | |
501 | seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777)); | |
502 | if (sbi->sb_lowercase) | |
503 | seq_printf(seq, ",case=lower"); | |
504 | if (!sbi->sb_chk) | |
505 | seq_printf(seq, ",check=none"); | |
506 | if (sbi->sb_chk == 2) | |
507 | seq_printf(seq, ",check=strict"); | |
508 | if (!sbi->sb_err) | |
509 | seq_printf(seq, ",errors=continue"); | |
510 | if (sbi->sb_err == 2) | |
511 | seq_printf(seq, ",errors=panic"); | |
512 | if (!sbi->sb_chkdsk) | |
513 | seq_printf(seq, ",chkdsk=no"); | |
514 | if (sbi->sb_chkdsk == 2) | |
515 | seq_printf(seq, ",chkdsk=always"); | |
516 | if (!sbi->sb_eas) | |
517 | seq_printf(seq, ",eas=no"); | |
518 | if (sbi->sb_eas == 1) | |
519 | seq_printf(seq, ",eas=ro"); | |
520 | if (sbi->sb_timeshift) | |
521 | seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift); | |
522 | return 0; | |
523 | } | |
524 | ||
1da177e4 LT |
525 | /* Super operations */ |
526 | ||
ee9b6d61 | 527 | static const struct super_operations hpfs_sops = |
1da177e4 LT |
528 | { |
529 | .alloc_inode = hpfs_alloc_inode, | |
4d436d5c | 530 | .free_inode = hpfs_free_inode, |
ea544009 | 531 | .evict_inode = hpfs_evict_inode, |
1da177e4 LT |
532 | .put_super = hpfs_put_super, |
533 | .statfs = hpfs_statfs, | |
534 | .remount_fs = hpfs_remount_fs, | |
037369b8 | 535 | .show_options = hpfs_show_options, |
1da177e4 LT |
536 | }; |
537 | ||
538 | static int hpfs_fill_super(struct super_block *s, void *options, int silent) | |
539 | { | |
540 | struct buffer_head *bh0, *bh1, *bh2; | |
541 | struct hpfs_boot_block *bootblock; | |
542 | struct hpfs_super_block *superblock; | |
543 | struct hpfs_spare_block *spareblock; | |
544 | struct hpfs_sb_info *sbi; | |
545 | struct inode *root; | |
546 | ||
0e1a43c7 EB |
547 | kuid_t uid; |
548 | kgid_t gid; | |
1da177e4 | 549 | umode_t umask; |
0fe105aa | 550 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
551 | |
552 | dnode_secno root_dno; | |
553 | struct hpfs_dirent *de = NULL; | |
554 | struct quad_buffer_head qbh; | |
555 | ||
556 | int o; | |
557 | ||
f8314dc6 | 558 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
db719222 | 559 | if (!sbi) { |
1da177e4 | 560 | return -ENOMEM; |
db719222 | 561 | } |
1da177e4 | 562 | s->s_fs_info = sbi; |
1da177e4 | 563 | |
7dd29d8d MP |
564 | mutex_init(&sbi->hpfs_mutex); |
565 | hpfs_lock(s); | |
566 | ||
de395b8a DH |
567 | uid = current_uid(); |
568 | gid = current_gid(); | |
ce3b0f8d | 569 | umask = current_umask(); |
1da177e4 | 570 | lowercase = 0; |
1da177e4 LT |
571 | eas = 2; |
572 | chk = 1; | |
573 | errs = 1; | |
574 | chkdsk = 1; | |
575 | timeshift = 0; | |
576 | ||
0fe105aa | 577 | if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, |
1da177e4 | 578 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 579 | pr_err("bad mount options.\n"); |
1da177e4 LT |
580 | goto bail0; |
581 | } | |
582 | if (o==2) { | |
583 | hpfs_help(); | |
584 | goto bail0; | |
585 | } | |
586 | ||
587 | /*sbi->sb_mounting = 1;*/ | |
588 | sb_set_blocksize(s, 512); | |
589 | sbi->sb_fs_size = -1; | |
590 | if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; | |
591 | if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; | |
592 | if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; | |
593 | ||
594 | /* Check magics */ | |
0b69760b MP |
595 | if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC |
596 | ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC | |
597 | || le32_to_cpu(spareblock->magic) != SP_MAGIC) { | |
b7cb1ce2 | 598 | if (!silent) |
a19189e5 | 599 | pr_err("Bad magic ... probably not HPFS\n"); |
1da177e4 LT |
600 | goto bail4; |
601 | } | |
602 | ||
603 | /* Check version */ | |
bc98a42c | 604 | if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) { |
a19189e5 | 605 | pr_err("Bad version %d,%d. Mount readonly to go around\n", |
1da177e4 | 606 | (int)superblock->version, (int)superblock->funcversion); |
a19189e5 | 607 | 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 |
608 | goto bail4; |
609 | } | |
610 | ||
1751e8a6 | 611 | s->s_flags |= SB_NOATIME; |
1da177e4 LT |
612 | |
613 | /* Fill superblock stuff */ | |
614 | s->s_magic = HPFS_SUPER_MAGIC; | |
615 | s->s_op = &hpfs_sops; | |
43d344d7 | 616 | s->s_d_op = &hpfs_dentry_operations; |
1da177e4 | 617 | |
0b69760b MP |
618 | sbi->sb_root = le32_to_cpu(superblock->root); |
619 | sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); | |
620 | sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); | |
621 | sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); | |
622 | sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); | |
623 | sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); | |
1da177e4 LT |
624 | sbi->sb_uid = uid; |
625 | sbi->sb_gid = gid; | |
626 | sbi->sb_mode = 0777 & ~umask; | |
627 | sbi->sb_n_free = -1; | |
628 | sbi->sb_n_free_dnodes = -1; | |
629 | sbi->sb_lowercase = lowercase; | |
1da177e4 LT |
630 | sbi->sb_eas = eas; |
631 | sbi->sb_chk = chk; | |
632 | sbi->sb_chkdsk = chkdsk; | |
633 | sbi->sb_err = errs; | |
634 | sbi->sb_timeshift = timeshift; | |
635 | sbi->sb_was_error = 0; | |
636 | sbi->sb_cp_table = NULL; | |
637 | sbi->sb_c_bitmap = -1; | |
638 | sbi->sb_max_fwd_alloc = 0xffffff; | |
3ebacb05 MP |
639 | |
640 | if (sbi->sb_fs_size >= 0x80000000) { | |
641 | hpfs_error(s, "invalid size in superblock: %08x", | |
642 | (unsigned)sbi->sb_fs_size); | |
643 | goto bail4; | |
644 | } | |
645 | ||
a64eefaa MP |
646 | if (spareblock->n_spares_used) |
647 | hpfs_load_hotfix_map(s, spareblock); | |
648 | ||
1da177e4 | 649 | /* Load bitmap directory */ |
0b69760b | 650 | if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) |
1da177e4 LT |
651 | goto bail4; |
652 | ||
653 | /* Check for general fs errors*/ | |
654 | if (spareblock->dirty && !spareblock->old_wrote) { | |
655 | if (errs == 2) { | |
a19189e5 | 656 | pr_err("Improperly stopped, not mounted\n"); |
1da177e4 LT |
657 | goto bail4; |
658 | } | |
659 | hpfs_error(s, "improperly stopped"); | |
660 | } | |
661 | ||
bc98a42c | 662 | if (!sb_rdonly(s)) { |
1da177e4 LT |
663 | spareblock->dirty = 1; |
664 | spareblock->old_wrote = 0; | |
665 | mark_buffer_dirty(bh2); | |
666 | } | |
667 | ||
0b69760b | 668 | if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { |
1da177e4 | 669 | if (errs >= 2) { |
a19189e5 | 670 | pr_err("Spare dnodes used, try chkdsk\n"); |
dab4c82a | 671 | mark_dirty(s, 0); |
1da177e4 LT |
672 | goto bail4; |
673 | } | |
674 | hpfs_error(s, "warning: spare dnodes used, try chkdsk"); | |
b7cb1ce2 | 675 | if (errs == 0) |
a19189e5 | 676 | pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); |
1da177e4 LT |
677 | } |
678 | if (chk) { | |
679 | unsigned a; | |
0b69760b MP |
680 | if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || |
681 | le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { | |
1da177e4 | 682 | hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", |
0b69760b | 683 | le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); |
1da177e4 LT |
684 | goto bail4; |
685 | } | |
686 | a = sbi->sb_dirband_size; | |
687 | sbi->sb_dirband_size = 0; | |
0b69760b MP |
688 | if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || |
689 | hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || | |
690 | hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { | |
dab4c82a | 691 | mark_dirty(s, 0); |
1da177e4 LT |
692 | goto bail4; |
693 | } | |
694 | sbi->sb_dirband_size = a; | |
b7cb1ce2 | 695 | } else |
a19189e5 | 696 | pr_err("You really don't want any checks? You are crazy...\n"); |
1da177e4 LT |
697 | |
698 | /* Load code page table */ | |
0b69760b MP |
699 | if (le32_to_cpu(spareblock->n_code_pages)) |
700 | if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) | |
a19189e5 | 701 | pr_err("code page support is disabled\n"); |
1da177e4 LT |
702 | |
703 | brelse(bh2); | |
704 | brelse(bh1); | |
705 | brelse(bh0); | |
706 | ||
707 | root = iget_locked(s, sbi->sb_root); | |
708 | if (!root) | |
709 | goto bail0; | |
710 | hpfs_init_inode(root); | |
711 | hpfs_read_inode(root); | |
712 | unlock_new_inode(root); | |
48fde701 AV |
713 | s->s_root = d_make_root(root); |
714 | if (!s->s_root) | |
1da177e4 | 715 | goto bail0; |
1da177e4 LT |
716 | |
717 | /* | |
718 | * find the root directory's . pointer & finish filling in the inode | |
719 | */ | |
720 | ||
721 | root_dno = hpfs_fnode_dno(s, sbi->sb_root); | |
722 | if (root_dno) | |
723 | de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); | |
724 | if (!de) | |
725 | hpfs_error(s, "unable to find root dir"); | |
726 | else { | |
0b69760b | 727 | root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); |
1da177e4 | 728 | root->i_atime.tv_nsec = 0; |
0b69760b | 729 | root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); |
1da177e4 | 730 | root->i_mtime.tv_nsec = 0; |
0b69760b | 731 | root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); |
1da177e4 | 732 | root->i_ctime.tv_nsec = 0; |
de5e2b36 | 733 | hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); |
1da177e4 LT |
734 | hpfs_i(root)->i_parent_dir = root->i_ino; |
735 | if (root->i_size == -1) | |
736 | root->i_size = 2048; | |
737 | if (root->i_blocks == -1) | |
738 | root->i_blocks = 5; | |
739 | hpfs_brelse4(&qbh); | |
740 | } | |
7dd29d8d | 741 | hpfs_unlock(s); |
1da177e4 LT |
742 | return 0; |
743 | ||
744 | bail4: brelse(bh2); | |
745 | bail3: brelse(bh1); | |
746 | bail2: brelse(bh0); | |
747 | bail1: | |
748 | bail0: | |
7dd29d8d | 749 | hpfs_unlock(s); |
30687e0a | 750 | free_sbi(sbi); |
1da177e4 LT |
751 | return -EINVAL; |
752 | } | |
753 | ||
152a0836 AV |
754 | static struct dentry *hpfs_mount(struct file_system_type *fs_type, |
755 | int flags, const char *dev_name, void *data) | |
1da177e4 | 756 | { |
152a0836 | 757 | return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); |
1da177e4 LT |
758 | } |
759 | ||
760 | static struct file_system_type hpfs_fs_type = { | |
761 | .owner = THIS_MODULE, | |
762 | .name = "hpfs", | |
152a0836 | 763 | .mount = hpfs_mount, |
1da177e4 LT |
764 | .kill_sb = kill_block_super, |
765 | .fs_flags = FS_REQUIRES_DEV, | |
766 | }; | |
3e64fe5b | 767 | MODULE_ALIAS_FS("hpfs"); |
1da177e4 LT |
768 | |
769 | static int __init init_hpfs_fs(void) | |
770 | { | |
771 | int err = init_inodecache(); | |
772 | if (err) | |
773 | goto out1; | |
774 | err = register_filesystem(&hpfs_fs_type); | |
775 | if (err) | |
776 | goto out; | |
777 | return 0; | |
778 | out: | |
779 | destroy_inodecache(); | |
780 | out1: | |
781 | return err; | |
782 | } | |
783 | ||
784 | static void __exit exit_hpfs_fs(void) | |
785 | { | |
786 | unregister_filesystem(&hpfs_fs_type); | |
787 | destroy_inodecache(); | |
788 | } | |
789 | ||
790 | module_init(init_hpfs_fs) | |
791 | module_exit(exit_hpfs_fs) | |
792 | MODULE_LICENSE("GPL"); |