Commit | Line | Data |
---|---|---|
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 | ||
a27b5b97 MP |
199 | |
200 | long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg) | |
201 | { | |
202 | switch (cmd) { | |
203 | case FITRIM: { | |
204 | struct fstrim_range range; | |
205 | secno n_trimmed; | |
206 | int r; | |
207 | if (!capable(CAP_SYS_ADMIN)) | |
208 | return -EPERM; | |
209 | if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) | |
210 | return -EFAULT; | |
211 | r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed); | |
212 | if (r) | |
213 | return r; | |
214 | range.len = (u64)n_trimmed << 9; | |
215 | if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range))) | |
216 | return -EFAULT; | |
217 | return 0; | |
218 | } | |
219 | default: { | |
220 | return -ENOIOCTLCMD; | |
221 | } | |
222 | } | |
223 | } | |
224 | ||
225 | ||
e18b890b | 226 | static struct kmem_cache * hpfs_inode_cachep; |
1da177e4 LT |
227 | |
228 | static struct inode *hpfs_alloc_inode(struct super_block *sb) | |
229 | { | |
230 | struct hpfs_inode_info *ei; | |
e6b4f8da | 231 | ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); |
1da177e4 LT |
232 | if (!ei) |
233 | return NULL; | |
234 | ei->vfs_inode.i_version = 1; | |
235 | return &ei->vfs_inode; | |
236 | } | |
237 | ||
fa0d7e3d | 238 | static void hpfs_i_callback(struct rcu_head *head) |
1da177e4 | 239 | { |
fa0d7e3d | 240 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
241 | kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); |
242 | } | |
243 | ||
fa0d7e3d NP |
244 | static void hpfs_destroy_inode(struct inode *inode) |
245 | { | |
246 | call_rcu(&inode->i_rcu, hpfs_i_callback); | |
247 | } | |
248 | ||
51cc5068 | 249 | static void init_once(void *foo) |
1da177e4 LT |
250 | { |
251 | struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; | |
252 | ||
a35afb83 | 253 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 254 | } |
20c2df83 | 255 | |
1da177e4 LT |
256 | static int init_inodecache(void) |
257 | { | |
258 | hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", | |
259 | sizeof(struct hpfs_inode_info), | |
fffb60f9 PJ |
260 | 0, (SLAB_RECLAIM_ACCOUNT| |
261 | SLAB_MEM_SPREAD), | |
20c2df83 | 262 | init_once); |
1da177e4 LT |
263 | if (hpfs_inode_cachep == NULL) |
264 | return -ENOMEM; | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static void destroy_inodecache(void) | |
269 | { | |
8c0a8537 KS |
270 | /* |
271 | * Make sure all delayed rcu free inodes are flushed before we | |
272 | * destroy cache. | |
273 | */ | |
274 | rcu_barrier(); | |
1a1d92c1 | 275 | kmem_cache_destroy(hpfs_inode_cachep); |
1da177e4 LT |
276 | } |
277 | ||
278 | /* | |
279 | * A tiny parser for option strings, stolen from dosfs. | |
280 | * Stolen again from read-only hpfs. | |
281 | * And updated for table-driven option parsing. | |
282 | */ | |
283 | ||
284 | enum { | |
285 | Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, | |
1da177e4 LT |
286 | Opt_check_none, Opt_check_normal, Opt_check_strict, |
287 | Opt_err_cont, Opt_err_ro, Opt_err_panic, | |
288 | Opt_eas_no, Opt_eas_ro, Opt_eas_rw, | |
289 | Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, | |
290 | Opt_timeshift, Opt_err, | |
291 | }; | |
292 | ||
a447c093 | 293 | static const match_table_t tokens = { |
1da177e4 LT |
294 | {Opt_help, "help"}, |
295 | {Opt_uid, "uid=%u"}, | |
296 | {Opt_gid, "gid=%u"}, | |
297 | {Opt_umask, "umask=%o"}, | |
298 | {Opt_case_lower, "case=lower"}, | |
299 | {Opt_case_asis, "case=asis"}, | |
1da177e4 LT |
300 | {Opt_check_none, "check=none"}, |
301 | {Opt_check_normal, "check=normal"}, | |
302 | {Opt_check_strict, "check=strict"}, | |
303 | {Opt_err_cont, "errors=continue"}, | |
304 | {Opt_err_ro, "errors=remount-ro"}, | |
305 | {Opt_err_panic, "errors=panic"}, | |
306 | {Opt_eas_no, "eas=no"}, | |
307 | {Opt_eas_ro, "eas=ro"}, | |
308 | {Opt_eas_rw, "eas=rw"}, | |
309 | {Opt_chkdsk_no, "chkdsk=no"}, | |
310 | {Opt_chkdsk_errors, "chkdsk=errors"}, | |
311 | {Opt_chkdsk_always, "chkdsk=always"}, | |
312 | {Opt_timeshift, "timeshift=%d"}, | |
313 | {Opt_err, NULL}, | |
314 | }; | |
315 | ||
0e1a43c7 | 316 | static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, |
0fe105aa | 317 | int *lowercase, int *eas, int *chk, int *errs, |
1da177e4 LT |
318 | int *chkdsk, int *timeshift) |
319 | { | |
320 | char *p; | |
321 | int option; | |
322 | ||
323 | if (!opts) | |
324 | return 1; | |
325 | ||
b7cb1ce2 | 326 | /*pr_info("Parsing opts: '%s'\n",opts);*/ |
1da177e4 LT |
327 | |
328 | while ((p = strsep(&opts, ",")) != NULL) { | |
329 | substring_t args[MAX_OPT_ARGS]; | |
330 | int token; | |
331 | if (!*p) | |
332 | continue; | |
333 | ||
334 | token = match_token(p, tokens, args); | |
335 | switch (token) { | |
336 | case Opt_help: | |
337 | return 2; | |
338 | case Opt_uid: | |
339 | if (match_int(args, &option)) | |
340 | return 0; | |
0e1a43c7 EB |
341 | *uid = make_kuid(current_user_ns(), option); |
342 | if (!uid_valid(*uid)) | |
343 | return 0; | |
1da177e4 LT |
344 | break; |
345 | case Opt_gid: | |
346 | if (match_int(args, &option)) | |
347 | return 0; | |
0e1a43c7 EB |
348 | *gid = make_kgid(current_user_ns(), option); |
349 | if (!gid_valid(*gid)) | |
350 | return 0; | |
1da177e4 LT |
351 | break; |
352 | case Opt_umask: | |
353 | if (match_octal(args, &option)) | |
354 | return 0; | |
355 | *umask = option; | |
356 | break; | |
357 | case Opt_case_lower: | |
358 | *lowercase = 1; | |
359 | break; | |
360 | case Opt_case_asis: | |
361 | *lowercase = 0; | |
362 | break; | |
1da177e4 LT |
363 | case Opt_check_none: |
364 | *chk = 0; | |
365 | break; | |
366 | case Opt_check_normal: | |
367 | *chk = 1; | |
368 | break; | |
369 | case Opt_check_strict: | |
370 | *chk = 2; | |
371 | break; | |
372 | case Opt_err_cont: | |
373 | *errs = 0; | |
374 | break; | |
375 | case Opt_err_ro: | |
376 | *errs = 1; | |
377 | break; | |
378 | case Opt_err_panic: | |
379 | *errs = 2; | |
380 | break; | |
381 | case Opt_eas_no: | |
382 | *eas = 0; | |
383 | break; | |
384 | case Opt_eas_ro: | |
385 | *eas = 1; | |
386 | break; | |
387 | case Opt_eas_rw: | |
388 | *eas = 2; | |
389 | break; | |
390 | case Opt_chkdsk_no: | |
391 | *chkdsk = 0; | |
392 | break; | |
393 | case Opt_chkdsk_errors: | |
394 | *chkdsk = 1; | |
395 | break; | |
396 | case Opt_chkdsk_always: | |
397 | *chkdsk = 2; | |
398 | break; | |
399 | case Opt_timeshift: | |
400 | { | |
401 | int m = 1; | |
402 | char *rhs = args[0].from; | |
403 | if (!rhs || !*rhs) | |
404 | return 0; | |
405 | if (*rhs == '-') m = -1; | |
406 | if (*rhs == '+' || *rhs == '-') rhs++; | |
407 | *timeshift = simple_strtoul(rhs, &rhs, 0) * m; | |
408 | if (*rhs) | |
409 | return 0; | |
410 | break; | |
411 | } | |
412 | default: | |
413 | return 0; | |
414 | } | |
415 | } | |
416 | return 1; | |
417 | } | |
418 | ||
419 | static inline void hpfs_help(void) | |
420 | { | |
b7cb1ce2 | 421 | pr_info("\n\ |
1da177e4 LT |
422 | HPFS filesystem options:\n\ |
423 | help do not mount and display this text\n\ | |
424 | uid=xxx set uid of files that don't have uid specified in eas\n\ | |
425 | gid=xxx set gid of files that don't have gid specified in eas\n\ | |
426 | umask=xxx set mode of files that don't have mode specified in eas\n\ | |
427 | case=lower lowercase all files\n\ | |
428 | case=asis do not lowercase files (default)\n\ | |
1da177e4 LT |
429 | check=none no fs checks - kernel may crash on corrupted filesystem\n\ |
430 | check=normal do some checks - it should not crash (default)\n\ | |
431 | check=strict do extra time-consuming checks, used for debugging\n\ | |
432 | errors=continue continue on errors\n\ | |
433 | errors=remount-ro remount read-only if errors found (default)\n\ | |
434 | errors=panic panic on errors\n\ | |
435 | chkdsk=no do not mark fs for chkdsking even if there were errors\n\ | |
436 | chkdsk=errors mark fs dirty if errors found (default)\n\ | |
437 | chkdsk=always always mark fs dirty - used for debugging\n\ | |
438 | eas=no ignore extended attributes\n\ | |
439 | eas=ro read but do not write extended attributes\n\ | |
440 | eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ | |
441 | timeshift=nnn add nnn seconds to file times\n\ | |
442 | \n"); | |
443 | } | |
444 | ||
445 | static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) | |
446 | { | |
0e1a43c7 EB |
447 | kuid_t uid; |
448 | kgid_t gid; | |
1da177e4 | 449 | umode_t umask; |
0fe105aa | 450 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
451 | int o; |
452 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
6d9c1fd4 | 453 | char *new_opts = kstrdup(data, GFP_KERNEL); |
1da177e4 | 454 | |
02b9984d TT |
455 | sync_filesystem(s); |
456 | ||
1da177e4 LT |
457 | *flags |= MS_NOATIME; |
458 | ||
9a311b96 | 459 | hpfs_lock(s); |
1da177e4 LT |
460 | uid = sbi->sb_uid; gid = sbi->sb_gid; |
461 | umask = 0777 & ~sbi->sb_mode; | |
0fe105aa | 462 | lowercase = sbi->sb_lowercase; |
1da177e4 LT |
463 | eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; |
464 | errs = sbi->sb_err; timeshift = sbi->sb_timeshift; | |
465 | ||
0fe105aa | 466 | if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, |
1da177e4 | 467 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 468 | pr_err("bad mount options.\n"); |
6d9c1fd4 | 469 | goto out_err; |
1da177e4 LT |
470 | } |
471 | if (o == 2) { | |
472 | hpfs_help(); | |
6d9c1fd4 | 473 | goto out_err; |
1da177e4 LT |
474 | } |
475 | if (timeshift != sbi->sb_timeshift) { | |
a19189e5 | 476 | pr_err("timeshift can't be changed using remount.\n"); |
6d9c1fd4 | 477 | goto out_err; |
1da177e4 LT |
478 | } |
479 | ||
480 | unmark_dirty(s); | |
481 | ||
482 | sbi->sb_uid = uid; sbi->sb_gid = gid; | |
483 | sbi->sb_mode = 0777 & ~umask; | |
0fe105aa | 484 | sbi->sb_lowercase = lowercase; |
1da177e4 LT |
485 | sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; |
486 | sbi->sb_err = errs; sbi->sb_timeshift = timeshift; | |
487 | ||
dab4c82a | 488 | if (!(*flags & MS_RDONLY)) mark_dirty(s, 1); |
1da177e4 | 489 | |
2a32cebd | 490 | replace_mount_options(s, new_opts); |
6d9c1fd4 | 491 | |
9a311b96 | 492 | hpfs_unlock(s); |
1da177e4 | 493 | return 0; |
6d9c1fd4 MS |
494 | |
495 | out_err: | |
9a311b96 | 496 | hpfs_unlock(s); |
6d9c1fd4 MS |
497 | kfree(new_opts); |
498 | return -EINVAL; | |
1da177e4 LT |
499 | } |
500 | ||
501 | /* Super operations */ | |
502 | ||
ee9b6d61 | 503 | static const struct super_operations hpfs_sops = |
1da177e4 LT |
504 | { |
505 | .alloc_inode = hpfs_alloc_inode, | |
506 | .destroy_inode = hpfs_destroy_inode, | |
ea544009 | 507 | .evict_inode = hpfs_evict_inode, |
1da177e4 LT |
508 | .put_super = hpfs_put_super, |
509 | .statfs = hpfs_statfs, | |
510 | .remount_fs = hpfs_remount_fs, | |
6d9c1fd4 | 511 | .show_options = generic_show_options, |
1da177e4 LT |
512 | }; |
513 | ||
514 | static int hpfs_fill_super(struct super_block *s, void *options, int silent) | |
515 | { | |
516 | struct buffer_head *bh0, *bh1, *bh2; | |
517 | struct hpfs_boot_block *bootblock; | |
518 | struct hpfs_super_block *superblock; | |
519 | struct hpfs_spare_block *spareblock; | |
520 | struct hpfs_sb_info *sbi; | |
521 | struct inode *root; | |
522 | ||
0e1a43c7 EB |
523 | kuid_t uid; |
524 | kgid_t gid; | |
1da177e4 | 525 | umode_t umask; |
0fe105aa | 526 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
1da177e4 LT |
527 | |
528 | dnode_secno root_dno; | |
529 | struct hpfs_dirent *de = NULL; | |
530 | struct quad_buffer_head qbh; | |
531 | ||
532 | int o; | |
533 | ||
6d9c1fd4 MS |
534 | save_mount_options(s, options); |
535 | ||
f8314dc6 | 536 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
db719222 | 537 | if (!sbi) { |
1da177e4 | 538 | return -ENOMEM; |
db719222 | 539 | } |
1da177e4 | 540 | s->s_fs_info = sbi; |
1da177e4 | 541 | |
7dd29d8d MP |
542 | mutex_init(&sbi->hpfs_mutex); |
543 | hpfs_lock(s); | |
544 | ||
de395b8a DH |
545 | uid = current_uid(); |
546 | gid = current_gid(); | |
ce3b0f8d | 547 | umask = current_umask(); |
1da177e4 | 548 | lowercase = 0; |
1da177e4 LT |
549 | eas = 2; |
550 | chk = 1; | |
551 | errs = 1; | |
552 | chkdsk = 1; | |
553 | timeshift = 0; | |
554 | ||
0fe105aa | 555 | if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, |
1da177e4 | 556 | &eas, &chk, &errs, &chkdsk, ×hift))) { |
a19189e5 | 557 | pr_err("bad mount options.\n"); |
1da177e4 LT |
558 | goto bail0; |
559 | } | |
560 | if (o==2) { | |
561 | hpfs_help(); | |
562 | goto bail0; | |
563 | } | |
564 | ||
565 | /*sbi->sb_mounting = 1;*/ | |
566 | sb_set_blocksize(s, 512); | |
567 | sbi->sb_fs_size = -1; | |
568 | if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; | |
569 | if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; | |
570 | if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; | |
571 | ||
572 | /* Check magics */ | |
0b69760b MP |
573 | if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC |
574 | ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC | |
575 | || le32_to_cpu(spareblock->magic) != SP_MAGIC) { | |
b7cb1ce2 | 576 | if (!silent) |
a19189e5 | 577 | pr_err("Bad magic ... probably not HPFS\n"); |
1da177e4 LT |
578 | goto bail4; |
579 | } | |
580 | ||
581 | /* Check version */ | |
582 | if (!(s->s_flags & MS_RDONLY) && | |
583 | superblock->funcversion != 2 && superblock->funcversion != 3) { | |
a19189e5 | 584 | pr_err("Bad version %d,%d. Mount readonly to go around\n", |
1da177e4 | 585 | (int)superblock->version, (int)superblock->funcversion); |
a19189e5 | 586 | 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 |
587 | goto bail4; |
588 | } | |
589 | ||
590 | s->s_flags |= MS_NOATIME; | |
591 | ||
592 | /* Fill superblock stuff */ | |
593 | s->s_magic = HPFS_SUPER_MAGIC; | |
594 | s->s_op = &hpfs_sops; | |
43d344d7 | 595 | s->s_d_op = &hpfs_dentry_operations; |
1da177e4 | 596 | |
0b69760b MP |
597 | sbi->sb_root = le32_to_cpu(superblock->root); |
598 | sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); | |
599 | sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); | |
600 | sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); | |
601 | sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); | |
602 | sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); | |
1da177e4 LT |
603 | sbi->sb_uid = uid; |
604 | sbi->sb_gid = gid; | |
605 | sbi->sb_mode = 0777 & ~umask; | |
606 | sbi->sb_n_free = -1; | |
607 | sbi->sb_n_free_dnodes = -1; | |
608 | sbi->sb_lowercase = lowercase; | |
1da177e4 LT |
609 | sbi->sb_eas = eas; |
610 | sbi->sb_chk = chk; | |
611 | sbi->sb_chkdsk = chkdsk; | |
612 | sbi->sb_err = errs; | |
613 | sbi->sb_timeshift = timeshift; | |
614 | sbi->sb_was_error = 0; | |
615 | sbi->sb_cp_table = NULL; | |
616 | sbi->sb_c_bitmap = -1; | |
617 | sbi->sb_max_fwd_alloc = 0xffffff; | |
3ebacb05 MP |
618 | |
619 | if (sbi->sb_fs_size >= 0x80000000) { | |
620 | hpfs_error(s, "invalid size in superblock: %08x", | |
621 | (unsigned)sbi->sb_fs_size); | |
622 | goto bail4; | |
623 | } | |
624 | ||
1da177e4 | 625 | /* Load bitmap directory */ |
0b69760b | 626 | if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) |
1da177e4 LT |
627 | goto bail4; |
628 | ||
629 | /* Check for general fs errors*/ | |
630 | if (spareblock->dirty && !spareblock->old_wrote) { | |
631 | if (errs == 2) { | |
a19189e5 | 632 | pr_err("Improperly stopped, not mounted\n"); |
1da177e4 LT |
633 | goto bail4; |
634 | } | |
635 | hpfs_error(s, "improperly stopped"); | |
636 | } | |
637 | ||
638 | if (!(s->s_flags & MS_RDONLY)) { | |
639 | spareblock->dirty = 1; | |
640 | spareblock->old_wrote = 0; | |
641 | mark_buffer_dirty(bh2); | |
642 | } | |
643 | ||
28fe3c19 | 644 | if (spareblock->hotfixes_used || spareblock->n_spares_used) { |
1da177e4 | 645 | if (errs >= 2) { |
a19189e5 | 646 | pr_err("Hotfixes not supported here, try chkdsk\n"); |
dab4c82a | 647 | mark_dirty(s, 0); |
1da177e4 LT |
648 | goto bail4; |
649 | } | |
650 | hpfs_error(s, "hotfixes not supported here, try chkdsk"); | |
b7cb1ce2 | 651 | if (errs == 0) |
a19189e5 | 652 | pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n"); |
b7cb1ce2 | 653 | else |
a19189e5 | 654 | pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n"); |
1da177e4 | 655 | } |
0b69760b | 656 | if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { |
1da177e4 | 657 | if (errs >= 2) { |
a19189e5 | 658 | pr_err("Spare dnodes used, try chkdsk\n"); |
dab4c82a | 659 | mark_dirty(s, 0); |
1da177e4 LT |
660 | goto bail4; |
661 | } | |
662 | hpfs_error(s, "warning: spare dnodes used, try chkdsk"); | |
b7cb1ce2 | 663 | if (errs == 0) |
a19189e5 | 664 | pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); |
1da177e4 LT |
665 | } |
666 | if (chk) { | |
667 | unsigned a; | |
0b69760b MP |
668 | if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || |
669 | le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { | |
1da177e4 | 670 | hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", |
0b69760b | 671 | le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); |
1da177e4 LT |
672 | goto bail4; |
673 | } | |
674 | a = sbi->sb_dirband_size; | |
675 | sbi->sb_dirband_size = 0; | |
0b69760b MP |
676 | if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") || |
677 | hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") || | |
678 | hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) { | |
dab4c82a | 679 | mark_dirty(s, 0); |
1da177e4 LT |
680 | goto bail4; |
681 | } | |
682 | sbi->sb_dirband_size = a; | |
b7cb1ce2 | 683 | } else |
a19189e5 | 684 | pr_err("You really don't want any checks? You are crazy...\n"); |
1da177e4 LT |
685 | |
686 | /* Load code page table */ | |
0b69760b MP |
687 | if (le32_to_cpu(spareblock->n_code_pages)) |
688 | if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) | |
a19189e5 | 689 | pr_err("code page support is disabled\n"); |
1da177e4 LT |
690 | |
691 | brelse(bh2); | |
692 | brelse(bh1); | |
693 | brelse(bh0); | |
694 | ||
695 | root = iget_locked(s, sbi->sb_root); | |
696 | if (!root) | |
697 | goto bail0; | |
698 | hpfs_init_inode(root); | |
699 | hpfs_read_inode(root); | |
700 | unlock_new_inode(root); | |
48fde701 AV |
701 | s->s_root = d_make_root(root); |
702 | if (!s->s_root) | |
1da177e4 | 703 | goto bail0; |
1da177e4 LT |
704 | |
705 | /* | |
706 | * find the root directory's . pointer & finish filling in the inode | |
707 | */ | |
708 | ||
709 | root_dno = hpfs_fnode_dno(s, sbi->sb_root); | |
710 | if (root_dno) | |
711 | de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); | |
712 | if (!de) | |
713 | hpfs_error(s, "unable to find root dir"); | |
714 | else { | |
0b69760b | 715 | root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date)); |
1da177e4 | 716 | root->i_atime.tv_nsec = 0; |
0b69760b | 717 | root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date)); |
1da177e4 | 718 | root->i_mtime.tv_nsec = 0; |
0b69760b | 719 | root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date)); |
1da177e4 | 720 | root->i_ctime.tv_nsec = 0; |
de5e2b36 | 721 | hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size); |
1da177e4 LT |
722 | hpfs_i(root)->i_parent_dir = root->i_ino; |
723 | if (root->i_size == -1) | |
724 | root->i_size = 2048; | |
725 | if (root->i_blocks == -1) | |
726 | root->i_blocks = 5; | |
727 | hpfs_brelse4(&qbh); | |
728 | } | |
7dd29d8d | 729 | hpfs_unlock(s); |
1da177e4 LT |
730 | return 0; |
731 | ||
732 | bail4: brelse(bh2); | |
733 | bail3: brelse(bh1); | |
734 | bail2: brelse(bh0); | |
735 | bail1: | |
736 | bail0: | |
7dd29d8d | 737 | hpfs_unlock(s); |
30687e0a | 738 | free_sbi(sbi); |
1da177e4 LT |
739 | return -EINVAL; |
740 | } | |
741 | ||
152a0836 AV |
742 | static struct dentry *hpfs_mount(struct file_system_type *fs_type, |
743 | int flags, const char *dev_name, void *data) | |
1da177e4 | 744 | { |
152a0836 | 745 | return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super); |
1da177e4 LT |
746 | } |
747 | ||
748 | static struct file_system_type hpfs_fs_type = { | |
749 | .owner = THIS_MODULE, | |
750 | .name = "hpfs", | |
152a0836 | 751 | .mount = hpfs_mount, |
1da177e4 LT |
752 | .kill_sb = kill_block_super, |
753 | .fs_flags = FS_REQUIRES_DEV, | |
754 | }; | |
3e64fe5b | 755 | MODULE_ALIAS_FS("hpfs"); |
1da177e4 LT |
756 | |
757 | static int __init init_hpfs_fs(void) | |
758 | { | |
759 | int err = init_inodecache(); | |
760 | if (err) | |
761 | goto out1; | |
762 | err = register_filesystem(&hpfs_fs_type); | |
763 | if (err) | |
764 | goto out; | |
765 | return 0; | |
766 | out: | |
767 | destroy_inodecache(); | |
768 | out1: | |
769 | return err; | |
770 | } | |
771 | ||
772 | static void __exit exit_hpfs_fs(void) | |
773 | { | |
774 | unregister_filesystem(&hpfs_fs_type); | |
775 | destroy_inodecache(); | |
776 | } | |
777 | ||
778 | module_init(init_hpfs_fs) | |
779 | module_exit(exit_hpfs_fs) | |
780 | MODULE_LICENSE("GPL"); |