1 | // SPDX-License-Identifier: GPL-2.0-only |
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> |
15 | #include <linux/magic.h> |
16 | #include <linux/sched.h> |
17 | #include <linux/bitmap.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/seq_file.h> |
20 | |
21 | /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ |
22 | |
23 | static void mark_dirty(struct super_block *s, int remount) |
24 | { |
25 | if (hpfs_sb(sb: s)->sb_chkdsk && (remount || !sb_rdonly(sb: s))) { |
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); |
32 | sync_dirty_buffer(bh); |
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; |
45 | if (sb_rdonly(sb: s)) return; |
46 | sync_blockdev(bdev: s->s_bdev); |
47 | if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { |
48 | sb->dirty = hpfs_sb(sb: s)->sb_chkdsk > 1 - hpfs_sb(sb: s)->sb_was_error; |
49 | sb->old_wrote = hpfs_sb(sb: s)->sb_chkdsk >= 2 && !hpfs_sb(sb: s)->sb_was_error; |
50 | mark_buffer_dirty(bh); |
51 | sync_dirty_buffer(bh); |
52 | brelse(bh); |
53 | } |
54 | } |
55 | |
56 | /* Filesystem error... */ |
57 | void hpfs_error(struct super_block *s, const char *fmt, ...) |
58 | { |
59 | struct va_format vaf; |
60 | va_list args; |
61 | |
62 | va_start(args, fmt); |
63 | |
64 | vaf.fmt = fmt; |
65 | vaf.va = &args; |
66 | |
67 | pr_err("filesystem error: %pV" , &vaf); |
68 | |
69 | va_end(args); |
70 | |
71 | if (!hpfs_sb(sb: s)->sb_was_error) { |
72 | if (hpfs_sb(sb: s)->sb_err == 2) { |
73 | pr_cont("; crashing the system because you wanted it\n" ); |
74 | mark_dirty(s, remount: 0); |
75 | panic(fmt: "HPFS panic" ); |
76 | } else if (hpfs_sb(sb: s)->sb_err == 1) { |
77 | if (sb_rdonly(sb: s)) |
78 | pr_cont("; already mounted read-only\n" ); |
79 | else { |
80 | pr_cont("; remounting read-only\n" ); |
81 | mark_dirty(s, remount: 0); |
82 | s->s_flags |= SB_RDONLY; |
83 | } |
84 | } else if (sb_rdonly(sb: s)) |
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" ); |
90 | hpfs_sb(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, fmt: "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 | |
113 | static void free_sbi(struct hpfs_sb_info *sbi) |
114 | { |
115 | kfree(objp: sbi->sb_cp_table); |
116 | kfree(objp: sbi->sb_bmp_dir); |
117 | kfree(objp: sbi); |
118 | } |
119 | |
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 | { |
127 | hpfs_lock(s); |
128 | unmark_dirty(s); |
129 | hpfs_unlock(s); |
130 | call_rcu(head: &hpfs_sb(sb: s)->rcu, func: lazy_free_sbi); |
131 | } |
132 | |
133 | static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) |
134 | { |
135 | struct quad_buffer_head qbh; |
136 | unsigned long *bits; |
137 | unsigned count; |
138 | |
139 | bits = hpfs_map_4sectors(s, secno, &qbh, 0); |
140 | if (!bits) |
141 | return (unsigned)-1; |
142 | count = bitmap_weight(src: bits, nbits: 2048 * BITS_PER_BYTE); |
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(sb: s)->sb_fs_size + 0x3fff) >> 14; |
151 | count = 0; |
152 | for (n = 0; n < COUNT_RD_AHEAD; n++) { |
153 | hpfs_prefetch_bitmap(s, n); |
154 | } |
155 | for (n = 0; n < n_bands; n++) { |
156 | unsigned c; |
157 | hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD); |
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; |
161 | } |
162 | return count; |
163 | } |
164 | |
165 | unsigned hpfs_get_free_dnodes(struct super_block *s) |
166 | { |
167 | struct hpfs_sb_info *sbi = hpfs_sb(sb: s); |
168 | if (sbi->sb_n_free_dnodes == (unsigned)-1) { |
169 | unsigned c = hpfs_count_one_bitmap(s, secno: 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 | |
177 | static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
178 | { |
179 | struct super_block *s = dentry->d_sb; |
180 | struct hpfs_sb_info *sbi = hpfs_sb(sb: s); |
181 | u64 id = huge_encode_dev(dev: s->s_bdev->bd_dev); |
182 | |
183 | hpfs_lock(s); |
184 | |
185 | if (sbi->sb_n_free == (unsigned)-1) |
186 | sbi->sb_n_free = count_bitmaps(s); |
187 | |
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; |
194 | buf->f_ffree = hpfs_get_free_dnodes(s); |
195 | buf->f_fsid = u64_to_fsid(v: id); |
196 | buf->f_namelen = 254; |
197 | |
198 | hpfs_unlock(s); |
199 | |
200 | return 0; |
201 | } |
202 | |
203 | |
204 | long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
205 | { |
206 | switch (cmd) { |
207 | case FITRIM: { |
208 | struct fstrim_range range; |
209 | secno n_trimmed; |
210 | int r; |
211 | if (!capable(CAP_SYS_ADMIN)) |
212 | return -EPERM; |
213 | if (copy_from_user(to: &range, from: (struct fstrim_range __user *)arg, n: sizeof(range))) |
214 | return -EFAULT; |
215 | r = hpfs_trim_fs(file_inode(f: file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed); |
216 | if (r) |
217 | return r; |
218 | range.len = (u64)n_trimmed << 9; |
219 | if (copy_to_user(to: (struct fstrim_range __user *)arg, from: &range, n: sizeof(range))) |
220 | return -EFAULT; |
221 | return 0; |
222 | } |
223 | default: { |
224 | return -ENOIOCTLCMD; |
225 | } |
226 | } |
227 | } |
228 | |
229 | |
230 | static struct kmem_cache * hpfs_inode_cachep; |
231 | |
232 | static struct inode *hpfs_alloc_inode(struct super_block *sb) |
233 | { |
234 | struct hpfs_inode_info *ei; |
235 | ei = alloc_inode_sb(sb, cache: hpfs_inode_cachep, GFP_NOFS); |
236 | if (!ei) |
237 | return NULL; |
238 | return &ei->vfs_inode; |
239 | } |
240 | |
241 | static void hpfs_free_inode(struct inode *inode) |
242 | { |
243 | kmem_cache_free(s: hpfs_inode_cachep, objp: hpfs_i(inode)); |
244 | } |
245 | |
246 | static void init_once(void *foo) |
247 | { |
248 | struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; |
249 | |
250 | inode_init_once(&ei->vfs_inode); |
251 | } |
252 | |
253 | static int init_inodecache(void) |
254 | { |
255 | hpfs_inode_cachep = kmem_cache_create(name: "hpfs_inode_cache" , |
256 | size: sizeof(struct hpfs_inode_info), |
257 | align: 0, flags: (SLAB_RECLAIM_ACCOUNT| |
258 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
259 | ctor: init_once); |
260 | if (hpfs_inode_cachep == NULL) |
261 | return -ENOMEM; |
262 | return 0; |
263 | } |
264 | |
265 | static void destroy_inodecache(void) |
266 | { |
267 | /* |
268 | * Make sure all delayed rcu free inodes are flushed before we |
269 | * destroy cache. |
270 | */ |
271 | rcu_barrier(); |
272 | kmem_cache_destroy(s: hpfs_inode_cachep); |
273 | } |
274 | |
275 | /* |
276 | * A tiny parser for option strings, stolen from dosfs. |
277 | * Stolen again from read-only hpfs. |
278 | * And updated for table-driven option parsing. |
279 | */ |
280 | |
281 | enum { |
282 | Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, |
283 | Opt_check_none, Opt_check_normal, Opt_check_strict, |
284 | Opt_err_cont, Opt_err_ro, Opt_err_panic, |
285 | Opt_eas_no, Opt_eas_ro, Opt_eas_rw, |
286 | Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, |
287 | Opt_timeshift, Opt_err, |
288 | }; |
289 | |
290 | static const match_table_t tokens = { |
291 | {Opt_help, "help" }, |
292 | {Opt_uid, "uid=%u" }, |
293 | {Opt_gid, "gid=%u" }, |
294 | {Opt_umask, "umask=%o" }, |
295 | {Opt_case_lower, "case=lower" }, |
296 | {Opt_case_asis, "case=asis" }, |
297 | {Opt_check_none, "check=none" }, |
298 | {Opt_check_normal, "check=normal" }, |
299 | {Opt_check_strict, "check=strict" }, |
300 | {Opt_err_cont, "errors=continue" }, |
301 | {Opt_err_ro, "errors=remount-ro" }, |
302 | {Opt_err_panic, "errors=panic" }, |
303 | {Opt_eas_no, "eas=no" }, |
304 | {Opt_eas_ro, "eas=ro" }, |
305 | {Opt_eas_rw, "eas=rw" }, |
306 | {Opt_chkdsk_no, "chkdsk=no" }, |
307 | {Opt_chkdsk_errors, "chkdsk=errors" }, |
308 | {Opt_chkdsk_always, "chkdsk=always" }, |
309 | {Opt_timeshift, "timeshift=%d" }, |
310 | {Opt_err, NULL}, |
311 | }; |
312 | |
313 | static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask, |
314 | int *lowercase, int *eas, int *chk, int *errs, |
315 | int *chkdsk, int *timeshift) |
316 | { |
317 | char *p; |
318 | int option; |
319 | |
320 | if (!opts) |
321 | return 1; |
322 | |
323 | /*pr_info("Parsing opts: '%s'\n",opts);*/ |
324 | |
325 | while ((p = strsep(&opts, "," )) != NULL) { |
326 | substring_t args[MAX_OPT_ARGS]; |
327 | int token; |
328 | if (!*p) |
329 | continue; |
330 | |
331 | token = match_token(p, table: tokens, args); |
332 | switch (token) { |
333 | case Opt_help: |
334 | return 2; |
335 | case Opt_uid: |
336 | if (match_int(args, result: &option)) |
337 | return 0; |
338 | *uid = make_kuid(current_user_ns(), uid: option); |
339 | if (!uid_valid(uid: *uid)) |
340 | return 0; |
341 | break; |
342 | case Opt_gid: |
343 | if (match_int(args, result: &option)) |
344 | return 0; |
345 | *gid = make_kgid(current_user_ns(), gid: option); |
346 | if (!gid_valid(gid: *gid)) |
347 | return 0; |
348 | break; |
349 | case Opt_umask: |
350 | if (match_octal(args, result: &option)) |
351 | return 0; |
352 | *umask = option; |
353 | break; |
354 | case Opt_case_lower: |
355 | *lowercase = 1; |
356 | break; |
357 | case Opt_case_asis: |
358 | *lowercase = 0; |
359 | break; |
360 | case Opt_check_none: |
361 | *chk = 0; |
362 | break; |
363 | case Opt_check_normal: |
364 | *chk = 1; |
365 | break; |
366 | case Opt_check_strict: |
367 | *chk = 2; |
368 | break; |
369 | case Opt_err_cont: |
370 | *errs = 0; |
371 | break; |
372 | case Opt_err_ro: |
373 | *errs = 1; |
374 | break; |
375 | case Opt_err_panic: |
376 | *errs = 2; |
377 | break; |
378 | case Opt_eas_no: |
379 | *eas = 0; |
380 | break; |
381 | case Opt_eas_ro: |
382 | *eas = 1; |
383 | break; |
384 | case Opt_eas_rw: |
385 | *eas = 2; |
386 | break; |
387 | case Opt_chkdsk_no: |
388 | *chkdsk = 0; |
389 | break; |
390 | case Opt_chkdsk_errors: |
391 | *chkdsk = 1; |
392 | break; |
393 | case Opt_chkdsk_always: |
394 | *chkdsk = 2; |
395 | break; |
396 | case Opt_timeshift: |
397 | { |
398 | int m = 1; |
399 | char *rhs = args[0].from; |
400 | if (!rhs || !*rhs) |
401 | return 0; |
402 | if (*rhs == '-') m = -1; |
403 | if (*rhs == '+' || *rhs == '-') rhs++; |
404 | *timeshift = simple_strtoul(rhs, &rhs, 0) * m; |
405 | if (*rhs) |
406 | return 0; |
407 | break; |
408 | } |
409 | default: |
410 | return 0; |
411 | } |
412 | } |
413 | return 1; |
414 | } |
415 | |
416 | static inline void hpfs_help(void) |
417 | { |
418 | pr_info("\n\ |
419 | HPFS filesystem options:\n\ |
420 | help do not mount and display this text\n\ |
421 | uid=xxx set uid of files that don't have uid specified in eas\n\ |
422 | gid=xxx set gid of files that don't have gid specified in eas\n\ |
423 | umask=xxx set mode of files that don't have mode specified in eas\n\ |
424 | case=lower lowercase all files\n\ |
425 | case=asis do not lowercase files (default)\n\ |
426 | check=none no fs checks - kernel may crash on corrupted filesystem\n\ |
427 | check=normal do some checks - it should not crash (default)\n\ |
428 | check=strict do extra time-consuming checks, used for debugging\n\ |
429 | errors=continue continue on errors\n\ |
430 | errors=remount-ro remount read-only if errors found (default)\n\ |
431 | errors=panic panic on errors\n\ |
432 | chkdsk=no do not mark fs for chkdsking even if there were errors\n\ |
433 | chkdsk=errors mark fs dirty if errors found (default)\n\ |
434 | chkdsk=always always mark fs dirty - used for debugging\n\ |
435 | eas=no ignore extended attributes\n\ |
436 | eas=ro read but do not write extended attributes\n\ |
437 | eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ |
438 | timeshift=nnn add nnn seconds to file times\n\ |
439 | \n" ); |
440 | } |
441 | |
442 | static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) |
443 | { |
444 | kuid_t uid; |
445 | kgid_t gid; |
446 | umode_t umask; |
447 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
448 | int o; |
449 | struct hpfs_sb_info *sbi = hpfs_sb(sb: s); |
450 | |
451 | sync_filesystem(s); |
452 | |
453 | *flags |= SB_NOATIME; |
454 | |
455 | hpfs_lock(s); |
456 | uid = sbi->sb_uid; gid = sbi->sb_gid; |
457 | umask = 0777 & ~sbi->sb_mode; |
458 | lowercase = sbi->sb_lowercase; |
459 | eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; |
460 | errs = sbi->sb_err; timeshift = sbi->sb_timeshift; |
461 | |
462 | if (!(o = parse_opts(opts: data, uid: &uid, gid: &gid, umask: &umask, lowercase: &lowercase, |
463 | eas: &eas, chk: &chk, errs: &errs, chkdsk: &chkdsk, timeshift: ×hift))) { |
464 | pr_err("bad mount options.\n" ); |
465 | goto out_err; |
466 | } |
467 | if (o == 2) { |
468 | hpfs_help(); |
469 | goto out_err; |
470 | } |
471 | if (timeshift != sbi->sb_timeshift) { |
472 | pr_err("timeshift can't be changed using remount.\n" ); |
473 | goto out_err; |
474 | } |
475 | |
476 | unmark_dirty(s); |
477 | |
478 | sbi->sb_uid = uid; sbi->sb_gid = gid; |
479 | sbi->sb_mode = 0777 & ~umask; |
480 | sbi->sb_lowercase = lowercase; |
481 | sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; |
482 | sbi->sb_err = errs; sbi->sb_timeshift = timeshift; |
483 | |
484 | if (!(*flags & SB_RDONLY)) mark_dirty(s, remount: 1); |
485 | |
486 | hpfs_unlock(s); |
487 | return 0; |
488 | |
489 | out_err: |
490 | hpfs_unlock(s); |
491 | return -EINVAL; |
492 | } |
493 | |
494 | static int hpfs_show_options(struct seq_file *seq, struct dentry *root) |
495 | { |
496 | struct hpfs_sb_info *sbi = hpfs_sb(sb: root->d_sb); |
497 | |
498 | seq_printf(m: seq, fmt: ",uid=%u" , from_kuid_munged(to: &init_user_ns, uid: sbi->sb_uid)); |
499 | seq_printf(m: seq, fmt: ",gid=%u" , from_kgid_munged(to: &init_user_ns, gid: sbi->sb_gid)); |
500 | seq_printf(m: seq, fmt: ",umask=%03o" , (~sbi->sb_mode & 0777)); |
501 | if (sbi->sb_lowercase) |
502 | seq_printf(m: seq, fmt: ",case=lower" ); |
503 | if (!sbi->sb_chk) |
504 | seq_printf(m: seq, fmt: ",check=none" ); |
505 | if (sbi->sb_chk == 2) |
506 | seq_printf(m: seq, fmt: ",check=strict" ); |
507 | if (!sbi->sb_err) |
508 | seq_printf(m: seq, fmt: ",errors=continue" ); |
509 | if (sbi->sb_err == 2) |
510 | seq_printf(m: seq, fmt: ",errors=panic" ); |
511 | if (!sbi->sb_chkdsk) |
512 | seq_printf(m: seq, fmt: ",chkdsk=no" ); |
513 | if (sbi->sb_chkdsk == 2) |
514 | seq_printf(m: seq, fmt: ",chkdsk=always" ); |
515 | if (!sbi->sb_eas) |
516 | seq_printf(m: seq, fmt: ",eas=no" ); |
517 | if (sbi->sb_eas == 1) |
518 | seq_printf(m: seq, fmt: ",eas=ro" ); |
519 | if (sbi->sb_timeshift) |
520 | seq_printf(m: seq, fmt: ",timeshift=%d" , sbi->sb_timeshift); |
521 | return 0; |
522 | } |
523 | |
524 | /* Super operations */ |
525 | |
526 | static const struct super_operations hpfs_sops = |
527 | { |
528 | .alloc_inode = hpfs_alloc_inode, |
529 | .free_inode = hpfs_free_inode, |
530 | .evict_inode = hpfs_evict_inode, |
531 | .put_super = hpfs_put_super, |
532 | .statfs = hpfs_statfs, |
533 | .remount_fs = hpfs_remount_fs, |
534 | .show_options = hpfs_show_options, |
535 | }; |
536 | |
537 | static int hpfs_fill_super(struct super_block *s, void *options, int silent) |
538 | { |
539 | struct buffer_head *bh0, *bh1, *bh2; |
540 | struct hpfs_boot_block *bootblock; |
541 | struct hpfs_super_block *superblock; |
542 | struct hpfs_spare_block *spareblock; |
543 | struct hpfs_sb_info *sbi; |
544 | struct inode *root; |
545 | |
546 | kuid_t uid; |
547 | kgid_t gid; |
548 | umode_t umask; |
549 | int lowercase, eas, chk, errs, chkdsk, timeshift; |
550 | |
551 | dnode_secno root_dno; |
552 | struct hpfs_dirent *de = NULL; |
553 | struct quad_buffer_head qbh; |
554 | |
555 | int o; |
556 | |
557 | sbi = kzalloc(size: sizeof(*sbi), GFP_KERNEL); |
558 | if (!sbi) { |
559 | return -ENOMEM; |
560 | } |
561 | s->s_fs_info = sbi; |
562 | |
563 | mutex_init(&sbi->hpfs_mutex); |
564 | hpfs_lock(s); |
565 | |
566 | uid = current_uid(); |
567 | gid = current_gid(); |
568 | umask = current_umask(); |
569 | lowercase = 0; |
570 | eas = 2; |
571 | chk = 1; |
572 | errs = 1; |
573 | chkdsk = 1; |
574 | timeshift = 0; |
575 | |
576 | if (!(o = parse_opts(opts: options, uid: &uid, gid: &gid, umask: &umask, lowercase: &lowercase, |
577 | eas: &eas, chk: &chk, errs: &errs, chkdsk: &chkdsk, timeshift: ×hift))) { |
578 | pr_err("bad mount options.\n" ); |
579 | goto bail0; |
580 | } |
581 | if (o==2) { |
582 | hpfs_help(); |
583 | goto bail0; |
584 | } |
585 | |
586 | /*sbi->sb_mounting = 1;*/ |
587 | sb_set_blocksize(s, 512); |
588 | sbi->sb_fs_size = -1; |
589 | if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; |
590 | if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; |
591 | if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; |
592 | |
593 | /* Check magics */ |
594 | if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC |
595 | ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC |
596 | || le32_to_cpu(spareblock->magic) != SP_MAGIC) { |
597 | if (!silent) |
598 | pr_err("Bad magic ... probably not HPFS\n" ); |
599 | goto bail4; |
600 | } |
601 | |
602 | /* Check version */ |
603 | if (!sb_rdonly(sb: s) && superblock->funcversion != 2 && superblock->funcversion != 3) { |
604 | pr_err("Bad version %d,%d. Mount readonly to go around\n" , |
605 | (int)superblock->version, (int)superblock->funcversion); |
606 | pr_err("please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n" ); |
607 | goto bail4; |
608 | } |
609 | |
610 | s->s_flags |= SB_NOATIME; |
611 | |
612 | /* Fill superblock stuff */ |
613 | s->s_magic = HPFS_SUPER_MAGIC; |
614 | s->s_op = &hpfs_sops; |
615 | s->s_d_op = &hpfs_dentry_operations; |
616 | s->s_time_min = local_to_gmt(s, t: 0); |
617 | s->s_time_max = local_to_gmt(s, U32_MAX); |
618 | |
619 | sbi->sb_root = le32_to_cpu(superblock->root); |
620 | sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors); |
621 | sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps); |
622 | sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start); |
623 | sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band); |
624 | sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap); |
625 | sbi->sb_uid = uid; |
626 | sbi->sb_gid = gid; |
627 | sbi->sb_mode = 0777 & ~umask; |
628 | sbi->sb_n_free = -1; |
629 | sbi->sb_n_free_dnodes = -1; |
630 | sbi->sb_lowercase = lowercase; |
631 | sbi->sb_eas = eas; |
632 | sbi->sb_chk = chk; |
633 | sbi->sb_chkdsk = chkdsk; |
634 | sbi->sb_err = errs; |
635 | sbi->sb_timeshift = timeshift; |
636 | sbi->sb_was_error = 0; |
637 | sbi->sb_cp_table = NULL; |
638 | sbi->sb_c_bitmap = -1; |
639 | sbi->sb_max_fwd_alloc = 0xffffff; |
640 | |
641 | if (sbi->sb_fs_size >= 0x80000000) { |
642 | hpfs_error(s, fmt: "invalid size in superblock: %08x" , |
643 | (unsigned)sbi->sb_fs_size); |
644 | goto bail4; |
645 | } |
646 | |
647 | if (spareblock->n_spares_used) |
648 | hpfs_load_hotfix_map(s, spareblock); |
649 | |
650 | /* Load bitmap directory */ |
651 | if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) |
652 | goto bail4; |
653 | |
654 | /* Check for general fs errors*/ |
655 | if (spareblock->dirty && !spareblock->old_wrote) { |
656 | if (errs == 2) { |
657 | pr_err("Improperly stopped, not mounted\n" ); |
658 | goto bail4; |
659 | } |
660 | hpfs_error(s, fmt: "improperly stopped" ); |
661 | } |
662 | |
663 | if (!sb_rdonly(sb: s)) { |
664 | spareblock->dirty = 1; |
665 | spareblock->old_wrote = 0; |
666 | mark_buffer_dirty(bh: bh2); |
667 | } |
668 | |
669 | if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { |
670 | if (errs >= 2) { |
671 | pr_err("Spare dnodes used, try chkdsk\n" ); |
672 | mark_dirty(s, remount: 0); |
673 | goto bail4; |
674 | } |
675 | hpfs_error(s, fmt: "warning: spare dnodes used, try chkdsk" ); |
676 | if (errs == 0) |
677 | pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n" ); |
678 | } |
679 | if (chk) { |
680 | unsigned a; |
681 | if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) || |
682 | le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) { |
683 | hpfs_error(s, fmt: "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x" , |
684 | le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band)); |
685 | goto bail4; |
686 | } |
687 | a = sbi->sb_dirband_size; |
688 | sbi->sb_dirband_size = 0; |
689 | if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band" ) || |
690 | hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap" ) || |
691 | hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps" )) { |
692 | mark_dirty(s, remount: 0); |
693 | goto bail4; |
694 | } |
695 | sbi->sb_dirband_size = a; |
696 | } else |
697 | pr_err("You really don't want any checks? You are crazy...\n" ); |
698 | |
699 | /* Load code page table */ |
700 | if (le32_to_cpu(spareblock->n_code_pages)) |
701 | if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir)))) |
702 | pr_err("code page support is disabled\n" ); |
703 | |
704 | brelse(bh: bh2); |
705 | brelse(bh: bh1); |
706 | brelse(bh: bh0); |
707 | |
708 | root = iget_locked(s, sbi->sb_root); |
709 | if (!root) |
710 | goto bail0; |
711 | hpfs_init_inode(root); |
712 | hpfs_read_inode(root); |
713 | unlock_new_inode(root); |
714 | s->s_root = d_make_root(root); |
715 | if (!s->s_root) |
716 | goto bail0; |
717 | |
718 | /* |
719 | * find the root directory's . pointer & finish filling in the inode |
720 | */ |
721 | |
722 | root_dno = hpfs_fnode_dno(s, ino: sbi->sb_root); |
723 | if (root_dno) |
724 | de = map_dirent(root, root_dno, "\001\001" , 2, NULL, &qbh); |
725 | if (!de) |
726 | hpfs_error(s, fmt: "unable to find root dir" ); |
727 | else { |
728 | inode_set_atime(inode: root, |
729 | sec: local_to_gmt(s, le32_to_cpu(de->read_date)), |
730 | nsec: 0); |
731 | inode_set_mtime(inode: root, |
732 | sec: local_to_gmt(s, le32_to_cpu(de->write_date)), |
733 | nsec: 0); |
734 | inode_set_ctime(inode: root, |
735 | sec: local_to_gmt(s, le32_to_cpu(de->creation_date)), |
736 | nsec: 0); |
737 | hpfs_i(inode: root)->i_ea_size = le32_to_cpu(de->ea_size); |
738 | hpfs_i(inode: root)->i_parent_dir = root->i_ino; |
739 | if (root->i_size == -1) |
740 | root->i_size = 2048; |
741 | if (root->i_blocks == -1) |
742 | root->i_blocks = 5; |
743 | hpfs_brelse4(&qbh); |
744 | } |
745 | hpfs_unlock(s); |
746 | return 0; |
747 | |
748 | bail4: brelse(bh: bh2); |
749 | bail3: brelse(bh: bh1); |
750 | bail2: brelse(bh: bh0); |
751 | bail1: |
752 | bail0: |
753 | hpfs_unlock(s); |
754 | free_sbi(sbi); |
755 | return -EINVAL; |
756 | } |
757 | |
758 | static struct dentry *hpfs_mount(struct file_system_type *fs_type, |
759 | int flags, const char *dev_name, void *data) |
760 | { |
761 | return mount_bdev(fs_type, flags, dev_name, data, fill_super: hpfs_fill_super); |
762 | } |
763 | |
764 | static struct file_system_type hpfs_fs_type = { |
765 | .owner = THIS_MODULE, |
766 | .name = "hpfs" , |
767 | .mount = hpfs_mount, |
768 | .kill_sb = kill_block_super, |
769 | .fs_flags = FS_REQUIRES_DEV, |
770 | }; |
771 | MODULE_ALIAS_FS("hpfs" ); |
772 | |
773 | static int __init init_hpfs_fs(void) |
774 | { |
775 | int err = init_inodecache(); |
776 | if (err) |
777 | goto out1; |
778 | err = register_filesystem(&hpfs_fs_type); |
779 | if (err) |
780 | goto out; |
781 | return 0; |
782 | out: |
783 | destroy_inodecache(); |
784 | out1: |
785 | return err; |
786 | } |
787 | |
788 | static void __exit exit_hpfs_fs(void) |
789 | { |
790 | unregister_filesystem(&hpfs_fs_type); |
791 | destroy_inodecache(); |
792 | } |
793 | |
794 | module_init(init_hpfs_fs) |
795 | module_exit(exit_hpfs_fs) |
796 | MODULE_LICENSE("GPL" ); |
797 | |