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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 | ||
14da17f9 | 65 | pr_err("filesystem error: %s", err_buf); |
1da177e4 LT |
66 | if (!hpfs_sb(s)->sb_was_error) { |
67 | if (hpfs_sb(s)->sb_err == 2) { | |
b7cb1ce2 | 68 | pr_cont("; 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) { | |
b7cb1ce2 FF |
72 | if (s->s_flags & MS_RDONLY) |
73 | pr_cont("; already mounted read-only\n"); | |
1da177e4 | 74 | else { |
b7cb1ce2 | 75 | pr_cont("; remounting read-only\n"); |
dab4c82a | 76 | mark_dirty(s, 0); |
1da177e4 LT |
77 | s->s_flags |= MS_RDONLY; |
78 | } | |
b7cb1ce2 FF |
79 | } else if (s->s_flags & MS_RDONLY) |
80 | pr_cont("; going on - but anything won't be destroyed because it's read-only\n"); | |
81 | else | |
82 | pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); | |
83 | } else | |
84 | pr_cont("\n"); | |
1da177e4 LT |
85 | hpfs_sb(s)->sb_was_error = 1; |
86 | } | |
87 | ||
88 | /* | |
89 | * A little trick to detect cycles in many hpfs structures and don't let the | |
90 | * kernel crash on corrupted filesystem. When first called, set c2 to 0. | |
91 | * | |
92 | * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories | |
93 | * nested each in other, chkdsk locked up happilly. | |
94 | */ | |
95 | ||
96 | int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, | |
97 | char *msg) | |
98 | { | |
99 | if (*c2 && *c1 == key) { | |
100 | hpfs_error(s, "cycle detected on key %08x in %s", key, msg); | |
101 | return 1; | |
102 | } | |
103 | (*c2)++; | |
104 | if (!((*c2 - 1) & *c2)) *c1 = key; | |
105 | return 0; | |
106 | } | |
107 | ||
30687e0a | 108 | static void free_sbi(struct hpfs_sb_info *sbi) |
1da177e4 | 109 | { |
30687e0a AV |
110 | kfree(sbi->sb_cp_table); |
111 | kfree(sbi->sb_bmp_dir); | |
112 | kfree(sbi); | |
113 | } | |
6cfd0148 | 114 | |
30687e0a AV |
115 | static void lazy_free_sbi(struct rcu_head *rcu) |
116 | { | |
117 | free_sbi(container_of(rcu, struct hpfs_sb_info, rcu)); | |
118 | } | |
119 | ||
120 | static void hpfs_put_super(struct super_block *s) | |
121 | { | |
7dd29d8d MP |
122 | hpfs_lock(s); |
123 | unmark_dirty(s); | |
124 | hpfs_unlock(s); | |
30687e0a | 125 | call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi); |
1da177e4 LT |
126 | } |
127 | ||
2cbe5c76 | 128 | static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) |
1da177e4 LT |
129 | { |
130 | struct quad_buffer_head qbh; | |
f4c54fcf AM |
131 | unsigned long *bits; |
132 | unsigned count; | |
133 | ||
275f495d | 134 | bits = hpfs_map_4sectors(s, secno, &qbh, 0); |
f4c54fcf | 135 | if (!bits) |
2cbe5c76 | 136 | return (unsigned)-1; |
f4c54fcf | 137 | count = bitmap_weight(bits, 2048 * BITS_PER_BYTE); |
1da177e4 LT |
138 | hpfs_brelse4(&qbh); |
139 | return count; | |
140 | } | |
141 | ||
142 | static unsigned count_bitmaps(struct super_block *s) | |
143 | { | |
144 | unsigned n, count, n_bands; | |
145 | n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; | |
146 | count = 0; | |
275f495d MP |
147 | for (n = 0; n < COUNT_RD_AHEAD; n++) { |
148 | hpfs_prefetch_bitmap(s, n); | |
149 | } | |
150 | for (n = 0; n < n_bands; n++) { | |
2cbe5c76 | 151 | unsigned c; |
275f495d | 152 | hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); |
2cbe5c76 MP |
153 | c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n])); |
154 | if (c != (unsigned)-1) | |
155 | count += c; | |
275f495d | 156 | } |
1da177e4 LT |
157 | return count; |
158 | } | |
159 | ||
2cbe5c76 MP |
160 | unsigned hpfs_get_free_dnodes(struct super_block *s) |
161 | { | |
162 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
163 | if (sbi->sb_n_free_dnodes == (unsigned)-1) { | |
164 | unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap); | |
165 | if (c == (unsigned)-1) | |
166 | return 0; | |
167 | sbi->sb_n_free_dnodes = c; | |
168 | } | |
169 | return sbi->sb_n_free_dnodes; | |
170 | } | |
171 | ||
726c3342 | 172 | static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 173 | { |
726c3342 | 174 | struct super_block *s = dentry->d_sb; |
1da177e4 | 175 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
604d295c | 176 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
2cbe5c76 | 177 | |
9a311b96 | 178 | hpfs_lock(s); |
1da177e4 | 179 | |
2cbe5c76 | 180 | if (sbi->sb_n_free == (unsigned)-1) |
1da177e4 | 181 | sbi->sb_n_free = count_bitmaps(s); |
2cbe5c76 | 182 | |
1da177e4 LT |
183 | buf->f_type = s->s_magic; |
184 | buf->f_bsize = 512; | |
185 | buf->f_blocks = sbi->sb_fs_size; | |
186 | buf->f_bfree = sbi->sb_n_free; | |
187 | buf->f_bavail = sbi->sb_n_free; | |
188 | buf->f_files = sbi->sb_dirband_size / 4; | |
2cbe5c76 | 189 | buf->f_ffree = hpfs_get_free_dnodes(s); |
604d295c CL |
190 | buf->f_fsid.val[0] = (u32)id; |
191 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
192 | buf->f_namelen = 254; |
193 | ||
9a311b96 | 194 | hpfs_unlock(s); |
1da177e4 LT |
195 | |
196 | return 0; | |
197 | } | |
198 | ||
e18b890b | 199 | static struct kmem_cache * hpfs_inode_cachep; |
1da177e4 LT |
200 | |
201 | static struct inode *hpfs_alloc_inode(struct super_block *sb) | |
202 | { | |
203 | struct hpfs_inode_info *ei; | |
e6b4f8da | 204 | ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); |
1da177e4 LT |
205 | if (!ei) |
206 | return NULL; | |
207 | ei->vfs_inode.i_version = 1; | |
208 | return &ei->vfs_inode; | |
209 | } | |
210 | ||
fa0d7e3d | 211 | static void hpfs_i_callback(struct rcu_head *head) |
1da177e4 | 212 | { |
fa0d7e3d | 213 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
214 | kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); |
215 | } | |
216 | ||
fa0d7e3d NP |
217 | static void hpfs_destroy_inode(struct inode *inode) |
218 | { | |
219 | call_rcu(&inode->i_rcu, hpfs_i_callback); | |
220 | } | |
221 | ||
51cc5068 | 222 | static void init_once(void *foo) |
1da177e4 LT |
223 | { |
224 | struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; | |
225 | ||
a35afb83 | 226 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 227 | } |
20c2df83 | 228 | |
1da177e4 LT |
229 | static int init_inodecache(void) |
230 | { | |
231 | hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", | |
232 | sizeof(struct hpfs_inode_info), | |
fffb60f9 PJ |
233 | 0, (SLAB_RECLAIM_ACCOUNT| |
234 | SLAB_MEM_SPREAD), | |
20c2df83 | 235 | init_once); |
1da177e4 LT |
236 | if (hpfs_inode_cachep == NULL) |
237 | return -ENOMEM; | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static void destroy_inodecache(void) | |
242 | { | |
8c0a8537 KS |
243 | /* |
244 | * Make sure all delayed rcu free inodes are flushed before we | |
245 | * destroy cache. | |
246 | */ | |
247 | rcu_barrier(); | |
1a1d92c1 | 248 | kmem_cache_destroy(hpfs_inode_cachep); |
1da177e4 LT |
249 | } |
250 | ||
251 | /* | |
252 | * A tiny parser for option strings, stolen from dosfs. | |
253 | * Stolen again from read-only hpfs. | |
254 | * And updated for table-driven option parsing. | |
255 | */ | |
256 | ||
257 | enum { | |
258 | Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, | |
1da177e4 LT |
259 | Opt_check_none, Opt_check_normal, Opt_check_strict, |
260 | Opt_err_cont, Opt_err_ro, Opt_err_panic, | |
261 | Opt_eas_no, Opt_eas_ro, Opt_eas_rw, | |
262 | Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, | |
263 | Opt_timeshift, Opt_err, | |
264 | }; | |
265 | ||
a447c093 | 266 | static const match_table_t tokens = { |
1da177e4 LT |
267 | {Opt_help, "help"}, |
268 | {Opt_uid, "uid=%u"}, | |
269 | {Opt_gid, "gid=%u"}, | |
270 | {Opt_umask, "umask=%o"}, | |
271 | {Opt_case_lower, "case=lower"}, | |
272 | {Opt_case_asis, "case=asis"}, | |
1da177e4 LT |
273 | {Opt_check_none, "check=none"}, |
274 | {Opt_check_normal, "check=normal"}, | |
275 | {Opt_check_strict, "check=strict"}, | |
276 | {Opt_err_cont, "errors=continue"}, | |
277 | {Opt_err_ro, "errors=remount-ro"}, | |
278 | {Opt_err_panic, "errors=panic"}, | |
279 | {Opt_eas_no, "eas=no"}, | |
280 | {Opt_eas_ro, "eas=ro"}, | |
281 | {Opt_eas_rw, "eas=rw"}, | |
282 | {Opt_chkdsk_no, "chkdsk=no"}, | |
283 | {Opt_chkdsk_errors, "chkdsk=errors"}, | |
284 | {Opt_chkdsk_always, "chkdsk=always"}, | |
285 | {Opt_timeshift, "timeshift=%d"}, | |
286 | {Opt_err, NULL}, | |
287 | }; | |
288 | ||
0e1a43c7 | 289 | static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, |
0fe105aa | 290 | int *lowercase, int *eas, int *chk, int *errs, |
1da177e4 LT |
291 | int *chkdsk, int *timeshift) |
292 | { | |
293 | char *p; | |
294 | int option; | |
295 | ||
296 | if (!opts) | |
297 | return 1; | |
298 | ||
b7cb1ce2 | 299 | /*pr_info("Parsing opts: '%s'\n",opts);*/ |
1da177e4 LT |
300 | |
301 | while ((p = strsep(&opts, ",")) != NULL) { | |
302 | substring_t args[MAX_OPT_ARGS]; | |
303 | int token; | |
304 | if (!*p) | |
305 | continue; | |
306 | ||
307 | token = match_token(p, tokens, args); | |
308 | switch (token) { | |
309 | case Opt_help: | |
310 | return 2; | |
311 | case Opt_uid: | |
312 | if (match_int(args, &option)) | |
313 | return 0; | |
0e1a43c7 EB |
314 | *uid = make_kuid(current_user_ns(), option); |
315 | if (!uid_valid(*uid)) | |
316 | return 0; | |
1da177e4 LT |
317 | break; |
318 | case Opt_gid: | |
319 | if (match_int(args, &option)) | |
320 | return 0; | |
0e1a43c7 EB |
321 | *gid = make_kgid(current_user_ns(), option); |
322 | if (!gid_valid(*gid)) | |
323 | return 0; | |
1da177e4 LT |
324 | break; |
325 | case Opt_umask: | |
326 | if (match_octal(args, &option)) | |
327 | return 0; | |
328 | *umask = option; | |
329 | break; | |
330 | case Opt_case_lower: | |
331 | *lowercase = 1; | |
332 | break; | |
333 | case Opt_case_asis: | |
334 | *lowercase = 0; | |
335 | break; | |
1da177e4 LT |
336 | case Opt_check_none: |
337 | *chk = 0; | |
338 | break; | |
339 | case Opt_check_normal: | |
340 | *chk = 1; | |
341 | break; | |
342 | case Opt_check_strict: | |
343 | *chk = 2; | |
344 | break; | |
345 | case Opt_err_cont: | |
346 | *errs = 0; | |
347 | break; | |
348 | case Opt_err_ro: | |
349 | *errs = 1; | |
350 | break; | |
351 | case Opt_err_panic: | |
352 | *errs = 2; | |
353 | break; | |
354 | case Opt_eas_no: | |
355 | *eas = 0; | |
356 | break; | |
357 | case Opt_eas_ro: | |
358 | *eas = 1; | |
359 | break; | |
360 | case Opt_eas_rw: | |
361 | *eas = 2; | |
362 | break; | |
363 | case Opt_chkdsk_no: | |
364 | *chkdsk = 0; | |
365 | break; | |
366 | case Opt_chkdsk_errors: | |
367 | *chkdsk = 1; | |
368 | break; | |
369 | case Opt_chkdsk_always: | |
370 | *chkdsk = 2; | |
371 | break; | |
372 | case Opt_timeshift: | |
373 | { | |
374 | int m = 1; | |
375 | char *rhs = args[0].from; | |
376 | if (!rhs || !*rhs) | |
377 | return 0; | |
378 | if (*rhs == '-') m = -1; | |
379 | if (*rhs == '+' || *rhs == '-') rhs++; | |
380 | *timeshift = simple_strtoul(rhs, &rhs, 0) * m; | |
381 | if (*rhs) | |
382 | return 0; | |
383 | break; | |
384 | } | |
385 | default: | |
386 | return 0; | |
387 | } | |
388 | } | |
389 | return 1; | |
390 | } | |
391 | ||
392 | static inline void hpfs_help(void) | |
393 | { | |
b7cb1ce2 | 394 | pr_info("\n\ |
1da177e4 LT |
395 | HPFS filesystem options:\n\ |
396 | help do not mount and display this text\n\ | |
397 | uid=xxx set uid of files that don't have uid specified in eas\n\ | |
398 | gid=xxx set gid of files that don't have gid specified in eas\n\ | |
399 | umask=xxx set mode of files that don't have mode specified in eas\n\ | |
400 | case=lower lowercase all files\n\ | |
401 | case=asis do not lowercase files (default)\n\ | |
1da177e4 LT |
402 | check=none no fs checks - kernel may crash on corrupted filesystem\n\ |
403 | check=normal do some checks - it should not crash (default)\n\ | |
404 | check=strict do extra time-consuming checks, used for debugging\n\ | |
405 | errors=continue continue on errors\n\ | |
406 | errors=remount-ro remount read-only if errors found (default)\n\ | |
407 | errors=panic panic on errors\n\ | |
408 | chkdsk=no do not mark fs for chkdsking even if there were errors\n\ | |
409 | chkdsk=errors mark fs dirty if errors found (default)\n\ | |
410 | chkdsk=always always mark fs dirty - used for debugging\n\ | |
411 | eas=no ignore extended attributes\n\ | |
412 | eas=ro read but do not write extended attributes\n\ | |
413 | eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ | |
414 | timeshift=nnn add nnn seconds to file times\n\ | |
415 | \n"); | |
416 | } | |
417 | ||
418 | static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) | |
419 | { | |
0e1a43c7 EB |
420 | kuid_t uid; |
421 | kgid_t gid; | |
1da177e4 | 422 | umode_t umask; |
0fe105aa | 423 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
424 | int o; |
425 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
6d9c1fd4 | 426 | char *new_opts = kstrdup(data, GFP_KERNEL); |
1da177e4 | 427 | |
02b9984d TT |
428 | sync_filesystem(s); |
429 | ||
1da177e4 LT |
430 | *flags |= MS_NOATIME; |
431 | ||
9a311b96 | 432 | hpfs_lock(s); |
1da177e4 LT |
433 | uid = sbi->sb_uid; gid = sbi->sb_gid; |
434 | umask = 0777 & ~sbi->sb_mode; | |
0fe105aa | 435 | lowercase = sbi->sb_lowercase; |
1da177e4 LT |
436 | eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; |
437 | errs = sbi->sb_err; timeshift = sbi->sb_timeshift; | |
438 | ||
0fe105aa | 439 | if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, |
1da177e4 | 440 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 441 | pr_err("bad mount options.\n"); |
6d9c1fd4 | 442 | goto out_err; |
1da177e4 LT |
443 | } |
444 | if (o == 2) { | |
445 | hpfs_help(); | |
6d9c1fd4 | 446 | goto out_err; |
1da177e4 LT |
447 | } |
448 | if (timeshift != sbi->sb_timeshift) { | |
a19189e5 | 449 | pr_err("timeshift can't be changed using remount.\n"); |
6d9c1fd4 | 450 | goto out_err; |
1da177e4 LT |
451 | } |
452 | ||
453 | unmark_dirty(s); | |
454 | ||
455 | sbi->sb_uid = uid; sbi->sb_gid = gid; | |
456 | sbi->sb_mode = 0777 & ~umask; | |
0fe105aa | 457 | sbi->sb_lowercase = lowercase; |
1da177e4 LT |
458 | sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; |
459 | sbi->sb_err = errs; sbi->sb_timeshift = timeshift; | |
460 | ||
dab4c82a | 461 | if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); |
1da177e4 | 462 | |
2a32cebd | 463 | replace_mount_options(s, new_opts); |
6d9c1fd4 | 464 | |
9a311b96 | 465 | hpfs_unlock(s); |
1da177e4 | 466 | return 0; |
6d9c1fd4 MS |
467 | |
468 | out_err: | |
9a311b96 | 469 | hpfs_unlock(s); |
6d9c1fd4 MS |
470 | kfree(new_opts); |
471 | return -EINVAL; | |
1da177e4 LT |
472 | } |
473 | ||
474 | /* Super operations */ | |
475 | ||
ee9b6d61 | 476 | static const struct super_operations hpfs_sops = |
1da177e4 LT |
477 | { |
478 | .alloc_inode = hpfs_alloc_inode, | |
479 | .destroy_inode = hpfs_destroy_inode, | |
ea544009 | 480 | .evict_inode = hpfs_evict_inode, |
1da177e4 LT |
481 | .put_super = hpfs_put_super, |
482 | .statfs = hpfs_statfs, | |
483 | .remount_fs = hpfs_remount_fs, | |
6d9c1fd4 | 484 | .show_options = generic_show_options, |
1da177e4 LT |
485 | }; |
486 | ||
487 | static int hpfs_fill_super(struct super_block *s, void *options, int silent) | |
488 | { | |
489 | struct buffer_head *bh0, *bh1, *bh2; | |
490 | struct hpfs_boot_block *bootblock; | |
491 | struct hpfs_super_block *superblock; | |
492 | struct hpfs_spare_block *spareblock; | |
493 | struct hpfs_sb_info *sbi; | |
494 | struct inode *root; | |
495 | ||
0e1a43c7 EB |
496 | kuid_t uid; |
497 | kgid_t gid; | |
1da177e4 | 498 | umode_t umask; |
0fe105aa | 499 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
500 | |
501 | dnode_secno root_dno; | |
502 | struct hpfs_dirent *de = NULL; | |
503 | struct quad_buffer_head qbh; | |
504 | ||
505 | int o; | |
506 | ||
6d9c1fd4 MS |
507 | save_mount_options(s, options); |
508 | ||
f8314dc6 | 509 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
db719222 | 510 | if (!sbi) { |
1da177e4 | 511 | return -ENOMEM; |
db719222 | 512 | } |
1da177e4 | 513 | s->s_fs_info = sbi; |
1da177e4 | 514 | |
7dd29d8d MP |
515 | mutex_init(&sbi->hpfs_mutex); |
516 | hpfs_lock(s); | |
517 | ||
de395b8a DH |
518 | uid = current_uid(); |
519 | gid = current_gid(); | |
ce3b0f8d | 520 | umask = current_umask(); |
1da177e4 | 521 | lowercase = 0; |
1da177e4 LT |
522 | eas = 2; |
523 | chk = 1; | |
524 | errs = 1; | |
525 | chkdsk = 1; | |
526 | timeshift = 0; | |
527 | ||
0fe105aa | 528 | if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, |
1da177e4 | 529 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 530 | pr_err("bad mount options.\n"); |
1da177e4 LT |
531 | goto bail0; |
532 | } | |
533 | if (o==2) { | |
534 | hpfs_help(); | |
535 | goto bail0; | |
536 | } | |
537 | ||
538 | /*sbi->sb_mounting = 1;*/ | |
539 | sb_set_blocksize(s, 512); | |
540 | sbi->sb_fs_size = -1; | |
541 | if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; | |
542 | if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; | |
543 | if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; | |
544 | ||
545 | /* Check magics */ | |
0b69760b MP |
546 | if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC |
547 | ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC | |
548 | || le32_to_cpu(spareblock->magic) != SP_MAGIC) { | |
b7cb1ce2 | 549 | if (!silent) |
a19189e5 | 550 | pr_err("Bad magic ... probably not HPFS\n"); |
1da177e4 LT |
551 | goto bail4; |
552 | } | |
553 | ||
554 | /* Check version */ | |
555 | if (!(s->s_flags & MS_RDONLY) && | |
556 | superblock->funcversion != 2 && superblock->funcversion != 3) { | |
a19189e5 | 557 | pr_err("Bad version %d,%d. Mount readonly to go around\n", |
1da177e4 | 558 | (int)superblock->version, (int)superblock->funcversion); |
a19189e5 | 559 | 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 |
560 | goto bail4; |
561 | } | |
562 | ||
563 | s->s_flags |= MS_NOATIME; | |
564 | ||
565 | /* Fill superblock stuff */ | |
566 | s->s_magic = HPFS_SUPER_MAGIC; | |
567 | s->s_op = &hpfs_sops; | |
43d344d7 | 568 | s->s_d_op = &hpfs_dentry_operations; |
1da177e4 | 569 | |
0b69760b MP |
570 | sbi->sb_root = le32_to_cpu(superblock->root); |
571 | sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); | |
572 | sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); | |
573 | sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); | |
574 | sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); | |
575 | sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); | |
1da177e4 LT |
576 | sbi->sb_uid = uid; |
577 | sbi->sb_gid = gid; | |
578 | sbi->sb_mode = 0777 & ~umask; | |
579 | sbi->sb_n_free = -1; | |
580 | sbi->sb_n_free_dnodes = -1; | |
581 | sbi->sb_lowercase = lowercase; | |
1da177e4 LT |
582 | sbi->sb_eas = eas; |
583 | sbi->sb_chk = chk; | |
584 | sbi->sb_chkdsk = chkdsk; | |
585 | sbi->sb_err = errs; | |
586 | sbi->sb_timeshift = timeshift; | |
587 | sbi->sb_was_error = 0; | |
588 | sbi->sb_cp_table = NULL; | |
589 | sbi->sb_c_bitmap = -1; | |
590 | sbi->sb_max_fwd_alloc = 0xffffff; | |
3ebacb05 MP |
591 | |
592 | if (sbi->sb_fs_size >= 0x80000000) { | |
593 | hpfs_error(s, "invalid size in superblock: %08x", | |
594 | (unsigned)sbi->sb_fs_size); | |
595 | goto bail4; | |
596 | } | |
597 | ||
1da177e4 | 598 | /* Load bitmap directory */ |
0b69760b | 599 | if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) |
1da177e4 LT |
600 | goto bail4; |
601 | ||
602 | /* Check for general fs errors*/ | |
603 | if (spareblock->dirty && !spareblock->old_wrote) { | |
604 | if (errs == 2) { | |
a19189e5 | 605 | pr_err("Improperly stopped, not mounted\n"); |
1da177e4 LT |
606 | goto bail4; |
607 | } | |
608 | hpfs_error(s, "improperly stopped"); | |
609 | } | |
610 | ||
611 | if (!(s->s_flags & MS_RDONLY)) { | |
612 | spareblock->dirty = 1; | |
613 | spareblock->old_wrote = 0; | |
614 | mark_buffer_dirty(bh2); | |
615 | } | |
616 | ||
28fe3c19 | 617 | if (spareblock->hotfixes_used || spareblock->n_spares_used) { |
1da177e4 | 618 | if (errs >= 2) { |
a19189e5 | 619 | pr_err("Hotfixes not supported here, try chkdsk\n"); |
dab4c82a | 620 | mark_dirty(s, 0); |
1da177e4 LT |
621 | goto bail4; |
622 | } | |
623 | hpfs_error(s, "hotfixes not supported here, try chkdsk"); | |
b7cb1ce2 | 624 | if (errs == 0) |
a19189e5 | 625 | pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n"); |
b7cb1ce2 | 626 | else |
a19189e5 | 627 | pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n"); |
1da177e4 | 628 | } |
0b69760b | 629 | if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { |
1da177e4 | 630 | if (errs >= 2) { |
a19189e5 | 631 | pr_err("Spare dnodes used, try chkdsk\n"); |
dab4c82a | 632 | mark_dirty(s, 0); |
1da177e4 LT |
633 | goto bail4; |
634 | } | |
635 | hpfs_error(s, "warning: spare dnodes used, try chkdsk"); | |
b7cb1ce2 | 636 | if (errs == 0) |
a19189e5 | 637 | pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); |
1da177e4 LT |
638 | } |
639 | if (chk) { | |
640 | unsigned a; | |
0b69760b MP |
641 | if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || |
642 | le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { | |
1da177e4 | 643 | hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", |
0b69760b | 644 | le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); |
1da177e4 LT |
645 | goto bail4; |
646 | } | |
647 | a = sbi->sb_dirband_size; | |
648 | sbi->sb_dirband_size = 0; | |
0b69760b MP |
649 | if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || |
650 | hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || | |
651 | hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { | |
dab4c82a | 652 | mark_dirty(s, 0); |
1da177e4 LT |
653 | goto bail4; |
654 | } | |
655 | sbi->sb_dirband_size = a; | |
b7cb1ce2 | 656 | } else |
a19189e5 | 657 | pr_err("You really don't want any checks? You are crazy...\n"); |
1da177e4 LT |
658 | |
659 | /* Load code page table */ | |
0b69760b MP |
660 | if (le32_to_cpu(spareblock->n_code_pages)) |
661 | if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) | |
a19189e5 | 662 | pr_err("code page support is disabled\n"); |
1da177e4 LT |
663 | |
664 | brelse(bh2); | |
665 | brelse(bh1); | |
666 | brelse(bh0); | |
667 | ||
668 | root = iget_locked(s, sbi->sb_root); | |
669 | if (!root) | |
670 | goto bail0; | |
671 | hpfs_init_inode(root); | |
672 | hpfs_read_inode(root); | |
673 | unlock_new_inode(root); | |
48fde701 AV |
674 | s->s_root = d_make_root(root); |
675 | if (!s->s_root) | |
1da177e4 | 676 | goto bail0; |
1da177e4 LT |
677 | |
678 | /* | |
679 | * find the root directory's . pointer & finish filling in the inode | |
680 | */ | |
681 | ||
682 | root_dno = hpfs_fnode_dno(s, sbi->sb_root); | |
683 | if (root_dno) | |
684 | de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); | |
685 | if (!de) | |
686 | hpfs_error(s, "unable to find root dir"); | |
687 | else { | |
0b69760b | 688 | root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); |
1da177e4 | 689 | root->i_atime.tv_nsec = 0; |
0b69760b | 690 | root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); |
1da177e4 | 691 | root->i_mtime.tv_nsec = 0; |
0b69760b | 692 | root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); |
1da177e4 | 693 | root->i_ctime.tv_nsec = 0; |
de5e2b36 | 694 | hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); |
1da177e4 LT |
695 | hpfs_i(root)->i_parent_dir = root->i_ino; |
696 | if (root->i_size == -1) | |
697 | root->i_size = 2048; | |
698 | if (root->i_blocks == -1) | |
699 | root->i_blocks = 5; | |
700 | hpfs_brelse4(&qbh); | |
701 | } | |
7dd29d8d | 702 | hpfs_unlock(s); |
1da177e4 LT |
703 | return 0; |
704 | ||
705 | bail4: brelse(bh2); | |
706 | bail3: brelse(bh1); | |
707 | bail2: brelse(bh0); | |
708 | bail1: | |
709 | bail0: | |
7dd29d8d | 710 | hpfs_unlock(s); |
30687e0a | 711 | free_sbi(sbi); |
1da177e4 LT |
712 | return -EINVAL; |
713 | } | |
714 | ||
152a0836 AV |
715 | static struct dentry *hpfs_mount(struct file_system_type *fs_type, |
716 | int flags, const char *dev_name, void *data) | |
1da177e4 | 717 | { |
152a0836 | 718 | return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); |
1da177e4 LT |
719 | } |
720 | ||
721 | static struct file_system_type hpfs_fs_type = { | |
722 | .owner = THIS_MODULE, | |
723 | .name = "hpfs", | |
152a0836 | 724 | .mount = hpfs_mount, |
1da177e4 LT |
725 | .kill_sb = kill_block_super, |
726 | .fs_flags = FS_REQUIRES_DEV, | |
727 | }; | |
3e64fe5b | 728 | MODULE_ALIAS_FS("hpfs"); |
1da177e4 LT |
729 | |
730 | static int __init init_hpfs_fs(void) | |
731 | { | |
732 | int err = init_inodecache(); | |
733 | if (err) | |
734 | goto out1; | |
735 | err = register_filesystem(&hpfs_fs_type); | |
736 | if (err) | |
737 | goto out; | |
738 | return 0; | |
739 | out: | |
740 | destroy_inodecache(); | |
741 | out1: | |
742 | return err; | |
743 | } | |
744 | ||
745 | static void __exit exit_hpfs_fs(void) | |
746 | { | |
747 | unregister_filesystem(&hpfs_fs_type); | |
748 | destroy_inodecache(); | |
749 | } | |
750 | ||
751 | module_init(init_hpfs_fs) | |
752 | module_exit(exit_hpfs_fs) | |
753 | MODULE_LICENSE("GPL"); |