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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 | void hpfs_error(struct super_block *s, const char *fmt, ...) |
1da177e4 | 56 | { |
a28e4b2b | 57 | struct va_format vaf; |
352d94d0 AD |
58 | va_list args; |
59 | ||
60 | va_start(args, fmt); | |
a28e4b2b JP |
61 | |
62 | vaf.fmt = fmt; | |
63 | vaf.va = &args; | |
64 | ||
65 | pr_err("filesystem error: %pV", &vaf); | |
66 | ||
352d94d0 AD |
67 | va_end(args); |
68 | ||
1da177e4 LT |
69 | if (!hpfs_sb(s)->sb_was_error) { |
70 | if (hpfs_sb(s)->sb_err == 2) { | |
b7cb1ce2 | 71 | pr_cont("; crashing the system because you wanted it\n"); |
dab4c82a | 72 | mark_dirty(s, 0); |
1da177e4 LT |
73 | panic("HPFS panic"); |
74 | } else if (hpfs_sb(s)->sb_err == 1) { | |
b7cb1ce2 FF |
75 | if (s->s_flags & MS_RDONLY) |
76 | pr_cont("; already mounted read-only\n"); | |
1da177e4 | 77 | else { |
b7cb1ce2 | 78 | pr_cont("; remounting read-only\n"); |
dab4c82a | 79 | mark_dirty(s, 0); |
1da177e4 LT |
80 | s->s_flags |= MS_RDONLY; |
81 | } | |
b7cb1ce2 FF |
82 | } else if (s->s_flags & MS_RDONLY) |
83 | pr_cont("; going on - but anything won't be destroyed because it's read-only\n"); | |
84 | else | |
85 | pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); | |
86 | } else | |
87 | pr_cont("\n"); | |
1da177e4 LT |
88 | hpfs_sb(s)->sb_was_error = 1; |
89 | } | |
90 | ||
91 | /* | |
92 | * A little trick to detect cycles in many hpfs structures and don't let the | |
93 | * kernel crash on corrupted filesystem. When first called, set c2 to 0. | |
94 | * | |
95 | * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories | |
96 | * nested each in other, chkdsk locked up happilly. | |
97 | */ | |
98 | ||
99 | int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, | |
100 | char *msg) | |
101 | { | |
102 | if (*c2 && *c1 == key) { | |
103 | hpfs_error(s, "cycle detected on key %08x in %s", key, msg); | |
104 | return 1; | |
105 | } | |
106 | (*c2)++; | |
107 | if (!((*c2 - 1) & *c2)) *c1 = key; | |
108 | return 0; | |
109 | } | |
110 | ||
30687e0a | 111 | static void free_sbi(struct hpfs_sb_info *sbi) |
1da177e4 | 112 | { |
30687e0a AV |
113 | kfree(sbi->sb_cp_table); |
114 | kfree(sbi->sb_bmp_dir); | |
115 | kfree(sbi); | |
116 | } | |
6cfd0148 | 117 | |
30687e0a AV |
118 | static void lazy_free_sbi(struct rcu_head *rcu) |
119 | { | |
120 | free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); | |
121 | } | |
122 | ||
123 | static void hpfs_put_super(struct super_block *s) | |
124 | { | |
7dd29d8d MP |
125 | hpfs_lock(s); |
126 | unmark_dirty(s); | |
127 | hpfs_unlock(s); | |
30687e0a | 128 | call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); |
1da177e4 LT |
129 | } |
130 | ||
2cbe5c76 | 131 | static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) |
1da177e4 LT |
132 | { |
133 | struct quad_buffer_head qbh; | |
f4c54fcf AM |
134 | unsigned long *bits; |
135 | unsigned count; | |
136 | ||
275f495d | 137 | bits = hpfs_map_4sectors(s, secno, &qbh, 0); |
f4c54fcf | 138 | if (!bits) |
2cbe5c76 | 139 | return (unsigned)-1; |
f4c54fcf | 140 | count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); |
1da177e4 LT |
141 | hpfs_brelse4(&qbh); |
142 | return count; | |
143 | } | |
144 | ||
145 | static unsigned count_bitmaps(struct super_block *s) | |
146 | { | |
147 | unsigned n, count, n_bands; | |
148 | n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; | |
149 | count = 0; | |
275f495d MP |
150 | for (n = 0; n < COUNT_RD_AHEAD; n++) { |
151 | hpfs_prefetch_bitmap(s, n); | |
152 | } | |
153 | for (n = 0; n < n_bands; n++) { | |
2cbe5c76 | 154 | unsigned c; |
275f495d | 155 | hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); |
2cbe5c76 MP |
156 | c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); |
157 | if (c != (unsigned)-1) | |
158 | count += c; | |
275f495d | 159 | } |
1da177e4 LT |
160 | return count; |
161 | } | |
162 | ||
2cbe5c76 MP |
163 | unsigned hpfs_get_free_dnodes(struct super_block *s) |
164 | { | |
165 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
166 | if (sbi->sb_n_free_dnodes == (unsigned)-1) { | |
167 | unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap); | |
168 | if (c == (unsigned)-1) | |
169 | return 0; | |
170 | sbi->sb_n_free_dnodes = c; | |
171 | } | |
172 | return sbi->sb_n_free_dnodes; | |
173 | } | |
174 | ||
726c3342 | 175 | static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 176 | { |
726c3342 | 177 | struct super_block *s = dentry->d_sb; |
1da177e4 | 178 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
604d295c | 179 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
2cbe5c76 | 180 | |
9a311b96 | 181 | hpfs_lock(s); |
1da177e4 | 182 | |
2cbe5c76 | 183 | if (sbi->sb_n_free == (unsigned)-1) |
1da177e4 | 184 | sbi->sb_n_free = count_bitmaps(s); |
2cbe5c76 | 185 | |
1da177e4 LT |
186 | buf->f_type = s->s_magic; |
187 | buf->f_bsize = 512; | |
188 | buf->f_blocks = sbi->sb_fs_size; | |
189 | buf->f_bfree = sbi->sb_n_free; | |
190 | buf->f_bavail = sbi->sb_n_free; | |
191 | buf->f_files = sbi->sb_dirband_size / 4; | |
2cbe5c76 | 192 | buf->f_ffree = hpfs_get_free_dnodes(s); |
604d295c CL |
193 | buf->f_fsid.val[0] = (u32)id; |
194 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
195 | buf->f_namelen = 254; |
196 | ||
9a311b96 | 197 | hpfs_unlock(s); |
1da177e4 LT |
198 | |
199 | return 0; | |
200 | } | |
201 | ||
a27b5b97 MP |
202 | |
203 | long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
204 | { | |
205 | switch (cmd) { | |
206 | case FITRIM: { | |
207 | struct fstrim_range range; | |
208 | secno n_trimmed; | |
209 | int r; | |
210 | if (!capable(CAP_SYS_ADMIN)) | |
211 | return -EPERM; | |
212 | if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) | |
213 | return -EFAULT; | |
214 | r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed); | |
215 | if (r) | |
216 | return r; | |
217 | range.len = (u64)n_trimmed << 9; | |
218 | if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range))) | |
219 | return -EFAULT; | |
220 | return 0; | |
221 | } | |
222 | default: { | |
223 | return -ENOIOCTLCMD; | |
224 | } | |
225 | } | |
226 | } | |
227 | ||
228 | ||
e18b890b | 229 | static struct kmem_cache * hpfs_inode_cachep; |
1da177e4 LT |
230 | |
231 | static struct inode *hpfs_alloc_inode(struct super_block *sb) | |
232 | { | |
233 | struct hpfs_inode_info *ei; | |
d7b04097 | 234 | ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); |
1da177e4 LT |
235 | if (!ei) |
236 | return NULL; | |
237 | ei->vfs_inode.i_version = 1; | |
238 | return &ei->vfs_inode; | |
239 | } | |
240 | ||
fa0d7e3d | 241 | static void hpfs_i_callback(struct rcu_head *head) |
1da177e4 | 242 | { |
fa0d7e3d | 243 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
244 | kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); |
245 | } | |
246 | ||
fa0d7e3d NP |
247 | static void hpfs_destroy_inode(struct inode *inode) |
248 | { | |
249 | call_rcu(&inode->i_rcu, hpfs_i_callback); | |
250 | } | |
251 | ||
51cc5068 | 252 | static void init_once(void *foo) |
1da177e4 LT |
253 | { |
254 | struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; | |
255 | ||
a35afb83 | 256 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 257 | } |
20c2df83 | 258 | |
1da177e4 LT |
259 | static int init_inodecache(void) |
260 | { | |
261 | hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", | |
262 | sizeof(struct hpfs_inode_info), | |
fffb60f9 PJ |
263 | 0, (SLAB_RECLAIM_ACCOUNT| |
264 | SLAB_MEM_SPREAD), | |
20c2df83 | 265 | init_once); |
1da177e4 LT |
266 | if (hpfs_inode_cachep == NULL) |
267 | return -ENOMEM; | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static void destroy_inodecache(void) | |
272 | { | |
8c0a8537 KS |
273 | /* |
274 | * Make sure all delayed rcu free inodes are flushed before we | |
275 | * destroy cache. | |
276 | */ | |
277 | rcu_barrier(); | |
1a1d92c1 | 278 | kmem_cache_destroy(hpfs_inode_cachep); |
1da177e4 LT |
279 | } |
280 | ||
281 | /* | |
282 | * A tiny parser for option strings, stolen from dosfs. | |
283 | * Stolen again from read-only hpfs. | |
284 | * And updated for table-driven option parsing. | |
285 | */ | |
286 | ||
287 | enum { | |
288 | Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, | |
1da177e4 LT |
289 | Opt_check_none, Opt_check_normal, Opt_check_strict, |
290 | Opt_err_cont, Opt_err_ro, Opt_err_panic, | |
291 | Opt_eas_no, Opt_eas_ro, Opt_eas_rw, | |
292 | Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, | |
293 | Opt_timeshift, Opt_err, | |
294 | }; | |
295 | ||
a447c093 | 296 | static const match_table_t tokens = { |
1da177e4 LT |
297 | {Opt_help, "help"}, |
298 | {Opt_uid, "uid=%u"}, | |
299 | {Opt_gid, "gid=%u"}, | |
300 | {Opt_umask, "umask=%o"}, | |
301 | {Opt_case_lower, "case=lower"}, | |
302 | {Opt_case_asis, "case=asis"}, | |
1da177e4 LT |
303 | {Opt_check_none, "check=none"}, |
304 | {Opt_check_normal, "check=normal"}, | |
305 | {Opt_check_strict, "check=strict"}, | |
306 | {Opt_err_cont, "errors=continue"}, | |
307 | {Opt_err_ro, "errors=remount-ro"}, | |
308 | {Opt_err_panic, "errors=panic"}, | |
309 | {Opt_eas_no, "eas=no"}, | |
310 | {Opt_eas_ro, "eas=ro"}, | |
311 | {Opt_eas_rw, "eas=rw"}, | |
312 | {Opt_chkdsk_no, "chkdsk=no"}, | |
313 | {Opt_chkdsk_errors, "chkdsk=errors"}, | |
314 | {Opt_chkdsk_always, "chkdsk=always"}, | |
315 | {Opt_timeshift, "timeshift=%d"}, | |
316 | {Opt_err, NULL}, | |
317 | }; | |
318 | ||
0e1a43c7 | 319 | static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, |
0fe105aa | 320 | int *lowercase, int *eas, int *chk, int *errs, |
1da177e4 LT |
321 | int *chkdsk, int *timeshift) |
322 | { | |
323 | char *p; | |
324 | int option; | |
325 | ||
326 | if (!opts) | |
327 | return 1; | |
328 | ||
b7cb1ce2 | 329 | /*pr_info("Parsing opts: '%s'\n",opts);*/ |
1da177e4 LT |
330 | |
331 | while ((p = strsep(&opts, ",")) != NULL) { | |
332 | substring_t args[MAX_OPT_ARGS]; | |
333 | int token; | |
334 | if (!*p) | |
335 | continue; | |
336 | ||
337 | token = match_token(p, tokens, args); | |
338 | switch (token) { | |
339 | case Opt_help: | |
340 | return 2; | |
341 | case Opt_uid: | |
342 | if (match_int(args, &option)) | |
343 | return 0; | |
0e1a43c7 EB |
344 | *uid = make_kuid(current_user_ns(), option); |
345 | if (!uid_valid(*uid)) | |
346 | return 0; | |
1da177e4 LT |
347 | break; |
348 | case Opt_gid: | |
349 | if (match_int(args, &option)) | |
350 | return 0; | |
0e1a43c7 EB |
351 | *gid = make_kgid(current_user_ns(), option); |
352 | if (!gid_valid(*gid)) | |
353 | return 0; | |
1da177e4 LT |
354 | break; |
355 | case Opt_umask: | |
356 | if (match_octal(args, &option)) | |
357 | return 0; | |
358 | *umask = option; | |
359 | break; | |
360 | case Opt_case_lower: | |
361 | *lowercase = 1; | |
362 | break; | |
363 | case Opt_case_asis: | |
364 | *lowercase = 0; | |
365 | break; | |
1da177e4 LT |
366 | case Opt_check_none: |
367 | *chk = 0; | |
368 | break; | |
369 | case Opt_check_normal: | |
370 | *chk = 1; | |
371 | break; | |
372 | case Opt_check_strict: | |
373 | *chk = 2; | |
374 | break; | |
375 | case Opt_err_cont: | |
376 | *errs = 0; | |
377 | break; | |
378 | case Opt_err_ro: | |
379 | *errs = 1; | |
380 | break; | |
381 | case Opt_err_panic: | |
382 | *errs = 2; | |
383 | break; | |
384 | case Opt_eas_no: | |
385 | *eas = 0; | |
386 | break; | |
387 | case Opt_eas_ro: | |
388 | *eas = 1; | |
389 | break; | |
390 | case Opt_eas_rw: | |
391 | *eas = 2; | |
392 | break; | |
393 | case Opt_chkdsk_no: | |
394 | *chkdsk = 0; | |
395 | break; | |
396 | case Opt_chkdsk_errors: | |
397 | *chkdsk = 1; | |
398 | break; | |
399 | case Opt_chkdsk_always: | |
400 | *chkdsk = 2; | |
401 | break; | |
402 | case Opt_timeshift: | |
403 | { | |
404 | int m = 1; | |
405 | char *rhs = args[0].from; | |
406 | if (!rhs || !*rhs) | |
407 | return 0; | |
408 | if (*rhs == '-') m = -1; | |
409 | if (*rhs == '+' || *rhs == '-') rhs++; | |
410 | *timeshift = simple_strtoul(rhs, &rhs, 0) * m; | |
411 | if (*rhs) | |
412 | return 0; | |
413 | break; | |
414 | } | |
415 | default: | |
416 | return 0; | |
417 | } | |
418 | } | |
419 | return 1; | |
420 | } | |
421 | ||
422 | static inline void hpfs_help(void) | |
423 | { | |
b7cb1ce2 | 424 | pr_info("\n\ |
1da177e4 LT |
425 | HPFS filesystem options:\n\ |
426 | help do not mount and display this text\n\ | |
427 | uid=xxx set uid of files that don't have uid specified in eas\n\ | |
428 | gid=xxx set gid of files that don't have gid specified in eas\n\ | |
429 | umask=xxx set mode of files that don't have mode specified in eas\n\ | |
430 | case=lower lowercase all files\n\ | |
431 | case=asis do not lowercase files (default)\n\ | |
1da177e4 LT |
432 | check=none no fs checks - kernel may crash on corrupted filesystem\n\ |
433 | check=normal do some checks - it should not crash (default)\n\ | |
434 | check=strict do extra time-consuming checks, used for debugging\n\ | |
435 | errors=continue continue on errors\n\ | |
436 | errors=remount-ro remount read-only if errors found (default)\n\ | |
437 | errors=panic panic on errors\n\ | |
438 | chkdsk=no do not mark fs for chkdsking even if there were errors\n\ | |
439 | chkdsk=errors mark fs dirty if errors found (default)\n\ | |
440 | chkdsk=always always mark fs dirty - used for debugging\n\ | |
441 | eas=no ignore extended attributes\n\ | |
442 | eas=ro read but do not write extended attributes\n\ | |
443 | eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ | |
444 | timeshift=nnn add nnn seconds to file times\n\ | |
445 | \n"); | |
446 | } | |
447 | ||
448 | static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) | |
449 | { | |
0e1a43c7 EB |
450 | kuid_t uid; |
451 | kgid_t gid; | |
1da177e4 | 452 | umode_t umask; |
0fe105aa | 453 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
454 | int o; |
455 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
6d9c1fd4 | 456 | char *new_opts = kstrdup(data, GFP_KERNEL); |
ce657611 SK |
457 | |
458 | if (!new_opts) | |
459 | return -ENOMEM; | |
460 | ||
02b9984d TT |
461 | sync_filesystem(s); |
462 | ||
1da177e4 | 463 | *flags |= MS_NOATIME; |
ce657611 | 464 | |
9a311b96 | 465 | hpfs_lock(s); |
1da177e4 LT |
466 | uid = sbi->sb_uid; gid = sbi->sb_gid; |
467 | umask = 0777 & ~sbi->sb_mode; | |
0fe105aa | 468 | lowercase = sbi->sb_lowercase; |
1da177e4 LT |
469 | eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; |
470 | errs = sbi->sb_err; timeshift = sbi->sb_timeshift; | |
471 | ||
0fe105aa | 472 | if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, |
1da177e4 | 473 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 474 | pr_err("bad mount options.\n"); |
6d9c1fd4 | 475 | goto out_err; |
1da177e4 LT |
476 | } |
477 | if (o == 2) { | |
478 | hpfs_help(); | |
6d9c1fd4 | 479 | goto out_err; |
1da177e4 LT |
480 | } |
481 | if (timeshift != sbi->sb_timeshift) { | |
a19189e5 | 482 | pr_err("timeshift can't be changed using remount.\n"); |
6d9c1fd4 | 483 | goto out_err; |
1da177e4 LT |
484 | } |
485 | ||
486 | unmark_dirty(s); | |
487 | ||
488 | sbi->sb_uid = uid; sbi->sb_gid = gid; | |
489 | sbi->sb_mode = 0777 & ~umask; | |
0fe105aa | 490 | sbi->sb_lowercase = lowercase; |
1da177e4 LT |
491 | sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; |
492 | sbi->sb_err = errs; sbi->sb_timeshift = timeshift; | |
493 | ||
dab4c82a | 494 | if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); |
1da177e4 | 495 | |
2a32cebd | 496 | replace_mount_options(s, new_opts); |
6d9c1fd4 | 497 | |
9a311b96 | 498 | hpfs_unlock(s); |
1da177e4 | 499 | return 0; |
6d9c1fd4 MS |
500 | |
501 | out_err: | |
9a311b96 | 502 | hpfs_unlock(s); |
6d9c1fd4 MS |
503 | kfree(new_opts); |
504 | return -EINVAL; | |
1da177e4 LT |
505 | } |
506 | ||
507 | /* Super operations */ | |
508 | ||
ee9b6d61 | 509 | static const struct super_operations hpfs_sops = |
1da177e4 LT |
510 | { |
511 | .alloc_inode = hpfs_alloc_inode, | |
512 | .destroy_inode = hpfs_destroy_inode, | |
ea544009 | 513 | .evict_inode = hpfs_evict_inode, |
1da177e4 LT |
514 | .put_super = hpfs_put_super, |
515 | .statfs = hpfs_statfs, | |
516 | .remount_fs = hpfs_remount_fs, | |
6d9c1fd4 | 517 | .show_options = generic_show_options, |
1da177e4 LT |
518 | }; |
519 | ||
520 | static int hpfs_fill_super(struct super_block *s, void *options, int silent) | |
521 | { | |
522 | struct buffer_head *bh0, *bh1, *bh2; | |
523 | struct hpfs_boot_block *bootblock; | |
524 | struct hpfs_super_block *superblock; | |
525 | struct hpfs_spare_block *spareblock; | |
526 | struct hpfs_sb_info *sbi; | |
527 | struct inode *root; | |
528 | ||
0e1a43c7 EB |
529 | kuid_t uid; |
530 | kgid_t gid; | |
1da177e4 | 531 | umode_t umask; |
0fe105aa | 532 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
533 | |
534 | dnode_secno root_dno; | |
535 | struct hpfs_dirent *de = NULL; | |
536 | struct quad_buffer_head qbh; | |
537 | ||
538 | int o; | |
539 | ||
6d9c1fd4 MS |
540 | save_mount_options(s, options); |
541 | ||
f8314dc6 | 542 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
db719222 | 543 | if (!sbi) { |
1da177e4 | 544 | return -ENOMEM; |
db719222 | 545 | } |
1da177e4 | 546 | s->s_fs_info = sbi; |
1da177e4 | 547 | |
7dd29d8d MP |
548 | mutex_init(&sbi->hpfs_mutex); |
549 | hpfs_lock(s); | |
550 | ||
de395b8a DH |
551 | uid = current_uid(); |
552 | gid = current_gid(); | |
ce3b0f8d | 553 | umask = current_umask(); |
1da177e4 | 554 | lowercase = 0; |
1da177e4 LT |
555 | eas = 2; |
556 | chk = 1; | |
557 | errs = 1; | |
558 | chkdsk = 1; | |
559 | timeshift = 0; | |
560 | ||
0fe105aa | 561 | if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, |
1da177e4 | 562 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 563 | pr_err("bad mount options.\n"); |
1da177e4 LT |
564 | goto bail0; |
565 | } | |
566 | if (o==2) { | |
567 | hpfs_help(); | |
568 | goto bail0; | |
569 | } | |
570 | ||
571 | /*sbi->sb_mounting = 1;*/ | |
572 | sb_set_blocksize(s, 512); | |
573 | sbi->sb_fs_size = -1; | |
574 | if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; | |
575 | if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; | |
576 | if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; | |
577 | ||
578 | /* Check magics */ | |
0b69760b MP |
579 | if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC |
580 | ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC | |
581 | || le32_to_cpu(spareblock->magic) != SP_MAGIC) { | |
b7cb1ce2 | 582 | if (!silent) |
a19189e5 | 583 | pr_err("Bad magic ... probably not HPFS\n"); |
1da177e4 LT |
584 | goto bail4; |
585 | } | |
586 | ||
587 | /* Check version */ | |
588 | if (!(s->s_flags & MS_RDONLY) && | |
589 | superblock->funcversion != 2 && superblock->funcversion != 3) { | |
a19189e5 | 590 | pr_err("Bad version %d,%d. Mount readonly to go around\n", |
1da177e4 | 591 | (int)superblock->version, (int)superblock->funcversion); |
a19189e5 | 592 | 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 |
593 | goto bail4; |
594 | } | |
595 | ||
596 | s->s_flags |= MS_NOATIME; | |
597 | ||
598 | /* Fill superblock stuff */ | |
599 | s->s_magic = HPFS_SUPER_MAGIC; | |
600 | s->s_op = &hpfs_sops; | |
43d344d7 | 601 | s->s_d_op = &hpfs_dentry_operations; |
1da177e4 | 602 | |
0b69760b MP |
603 | sbi->sb_root = le32_to_cpu(superblock->root); |
604 | sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); | |
605 | sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); | |
606 | sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); | |
607 | sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); | |
608 | sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); | |
1da177e4 LT |
609 | sbi->sb_uid = uid; |
610 | sbi->sb_gid = gid; | |
611 | sbi->sb_mode = 0777 & ~umask; | |
612 | sbi->sb_n_free = -1; | |
613 | sbi->sb_n_free_dnodes = -1; | |
614 | sbi->sb_lowercase = lowercase; | |
1da177e4 LT |
615 | sbi->sb_eas = eas; |
616 | sbi->sb_chk = chk; | |
617 | sbi->sb_chkdsk = chkdsk; | |
618 | sbi->sb_err = errs; | |
619 | sbi->sb_timeshift = timeshift; | |
620 | sbi->sb_was_error = 0; | |
621 | sbi->sb_cp_table = NULL; | |
622 | sbi->sb_c_bitmap = -1; | |
623 | sbi->sb_max_fwd_alloc = 0xffffff; | |
3ebacb05 MP |
624 | |
625 | if (sbi->sb_fs_size >= 0x80000000) { | |
626 | hpfs_error(s, "invalid size in superblock: %08x", | |
627 | (unsigned)sbi->sb_fs_size); | |
628 | goto bail4; | |
629 | } | |
630 | ||
a64eefaa MP |
631 | if (spareblock->n_spares_used) |
632 | hpfs_load_hotfix_map(s, spareblock); | |
633 | ||
1da177e4 | 634 | /* Load bitmap directory */ |
0b69760b | 635 | if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) |
1da177e4 LT |
636 | goto bail4; |
637 | ||
638 | /* Check for general fs errors*/ | |
639 | if (spareblock->dirty && !spareblock->old_wrote) { | |
640 | if (errs == 2) { | |
a19189e5 | 641 | pr_err("Improperly stopped, not mounted\n"); |
1da177e4 LT |
642 | goto bail4; |
643 | } | |
644 | hpfs_error(s, "improperly stopped"); | |
645 | } | |
646 | ||
647 | if (!(s->s_flags & MS_RDONLY)) { | |
648 | spareblock->dirty = 1; | |
649 | spareblock->old_wrote = 0; | |
650 | mark_buffer_dirty(bh2); | |
651 | } | |
652 | ||
0b69760b | 653 | if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { |
1da177e4 | 654 | if (errs >= 2) { |
a19189e5 | 655 | pr_err("Spare dnodes used, try chkdsk\n"); |
dab4c82a | 656 | mark_dirty(s, 0); |
1da177e4 LT |
657 | goto bail4; |
658 | } | |
659 | hpfs_error(s, "warning: spare dnodes used, try chkdsk"); | |
b7cb1ce2 | 660 | if (errs == 0) |
a19189e5 | 661 | pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); |
1da177e4 LT |
662 | } |
663 | if (chk) { | |
664 | unsigned a; | |
0b69760b MP |
665 | if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || |
666 | le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { | |
1da177e4 | 667 | hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", |
0b69760b | 668 | le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); |
1da177e4 LT |
669 | goto bail4; |
670 | } | |
671 | a = sbi->sb_dirband_size; | |
672 | sbi->sb_dirband_size = 0; | |
0b69760b MP |
673 | if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || |
674 | hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || | |
675 | hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { | |
dab4c82a | 676 | mark_dirty(s, 0); |
1da177e4 LT |
677 | goto bail4; |
678 | } | |
679 | sbi->sb_dirband_size = a; | |
b7cb1ce2 | 680 | } else |
a19189e5 | 681 | pr_err("You really don't want any checks? You are crazy...\n"); |
1da177e4 LT |
682 | |
683 | /* Load code page table */ | |
0b69760b MP |
684 | if (le32_to_cpu(spareblock->n_code_pages)) |
685 | if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) | |
a19189e5 | 686 | pr_err("code page support is disabled\n"); |
1da177e4 LT |
687 | |
688 | brelse(bh2); | |
689 | brelse(bh1); | |
690 | brelse(bh0); | |
691 | ||
692 | root = iget_locked(s, sbi->sb_root); | |
693 | if (!root) | |
694 | goto bail0; | |
695 | hpfs_init_inode(root); | |
696 | hpfs_read_inode(root); | |
697 | unlock_new_inode(root); | |
48fde701 AV |
698 | s->s_root = d_make_root(root); |
699 | if (!s->s_root) | |
1da177e4 | 700 | goto bail0; |
1da177e4 LT |
701 | |
702 | /* | |
703 | * find the root directory's . pointer & finish filling in the inode | |
704 | */ | |
705 | ||
706 | root_dno = hpfs_fnode_dno(s, sbi->sb_root); | |
707 | if (root_dno) | |
708 | de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); | |
709 | if (!de) | |
710 | hpfs_error(s, "unable to find root dir"); | |
711 | else { | |
0b69760b | 712 | root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); |
1da177e4 | 713 | root->i_atime.tv_nsec = 0; |
0b69760b | 714 | root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); |
1da177e4 | 715 | root->i_mtime.tv_nsec = 0; |
0b69760b | 716 | root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); |
1da177e4 | 717 | root->i_ctime.tv_nsec = 0; |
de5e2b36 | 718 | hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); |
1da177e4 LT |
719 | hpfs_i(root)->i_parent_dir = root->i_ino; |
720 | if (root->i_size == -1) | |
721 | root->i_size = 2048; | |
722 | if (root->i_blocks == -1) | |
723 | root->i_blocks = 5; | |
724 | hpfs_brelse4(&qbh); | |
725 | } | |
7dd29d8d | 726 | hpfs_unlock(s); |
1da177e4 LT |
727 | return 0; |
728 | ||
729 | bail4: brelse(bh2); | |
730 | bail3: brelse(bh1); | |
731 | bail2: brelse(bh0); | |
732 | bail1: | |
733 | bail0: | |
7dd29d8d | 734 | hpfs_unlock(s); |
30687e0a | 735 | free_sbi(sbi); |
1da177e4 LT |
736 | return -EINVAL; |
737 | } | |
738 | ||
152a0836 AV |
739 | static struct dentry *hpfs_mount(struct file_system_type *fs_type, |
740 | int flags, const char *dev_name, void *data) | |
1da177e4 | 741 | { |
152a0836 | 742 | return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); |
1da177e4 LT |
743 | } |
744 | ||
745 | static struct file_system_type hpfs_fs_type = { | |
746 | .owner = THIS_MODULE, | |
747 | .name = "hpfs", | |
152a0836 | 748 | .mount = hpfs_mount, |
1da177e4 LT |
749 | .kill_sb = kill_block_super, |
750 | .fs_flags = FS_REQUIRES_DEV, | |
751 | }; | |
3e64fe5b | 752 | MODULE_ALIAS_FS("hpfs"); |
1da177e4 LT |
753 | |
754 | static int __init init_hpfs_fs(void) | |
755 | { | |
756 | int err = init_inodecache(); | |
757 | if (err) | |
758 | goto out1; | |
759 | err = register_filesystem(&hpfs_fs_type); | |
760 | if (err) | |
761 | goto out; | |
762 | return 0; | |
763 | out: | |
764 | destroy_inodecache(); | |
765 | out1: | |
766 | return err; | |
767 | } | |
768 | ||
769 | static void __exit exit_hpfs_fs(void) | |
770 | { | |
771 | unregister_filesystem(&hpfs_fs_type); | |
772 | destroy_inodecache(); | |
773 | } | |
774 | ||
775 | module_init(init_hpfs_fs) | |
776 | module_exit(exit_hpfs_fs) | |
777 | MODULE_LICENSE("GPL"); |