1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/fs/isofs/inode.c |
4 | * |
5 | * (C) 1991 Linus Torvalds - minix filesystem |
6 | * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. |
7 | * 1994 Eberhard Mönkeberg - multi session handling. |
8 | * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. |
9 | * 1997 Gordon Chaffee - Joliet CDs |
10 | * 1998 Eric Lammerts - ISO 9660 Level 3 |
11 | * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB |
12 | * 2004 Paul Serice - NFS Export Operations |
13 | */ |
14 | |
15 | #include <linux/init.h> |
16 | #include <linux/module.h> |
17 | |
18 | #include <linux/slab.h> |
19 | #include <linux/cred.h> |
20 | #include <linux/nls.h> |
21 | #include <linux/ctype.h> |
22 | #include <linux/statfs.h> |
23 | #include <linux/cdrom.h> |
24 | #include <linux/parser.h> |
25 | #include <linux/mpage.h> |
26 | #include <linux/user_namespace.h> |
27 | #include <linux/seq_file.h> |
28 | #include <linux/blkdev.h> |
29 | |
30 | #include "isofs.h" |
31 | #include "zisofs.h" |
32 | |
33 | /* max tz offset is 13 hours */ |
34 | #define MAX_TZ_OFFSET (52*15*60) |
35 | |
36 | #define BEQUIET |
37 | |
38 | static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); |
39 | static int isofs_dentry_cmpi(const struct dentry *dentry, |
40 | unsigned int len, const char *str, const struct qstr *name); |
41 | |
42 | #ifdef CONFIG_JOLIET |
43 | static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); |
44 | static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); |
45 | static int isofs_dentry_cmpi_ms(const struct dentry *dentry, |
46 | unsigned int len, const char *str, const struct qstr *name); |
47 | static int isofs_dentry_cmp_ms(const struct dentry *dentry, |
48 | unsigned int len, const char *str, const struct qstr *name); |
49 | #endif |
50 | |
51 | static void isofs_put_super(struct super_block *sb) |
52 | { |
53 | struct isofs_sb_info *sbi = ISOFS_SB(sb); |
54 | |
55 | #ifdef CONFIG_JOLIET |
56 | unload_nls(sbi->s_nls_iocharset); |
57 | #endif |
58 | |
59 | kfree(objp: sbi); |
60 | sb->s_fs_info = NULL; |
61 | return; |
62 | } |
63 | |
64 | static int isofs_read_inode(struct inode *, int relocated); |
65 | static int isofs_statfs (struct dentry *, struct kstatfs *); |
66 | static int isofs_show_options(struct seq_file *, struct dentry *); |
67 | |
68 | static struct kmem_cache *isofs_inode_cachep; |
69 | |
70 | static struct inode *isofs_alloc_inode(struct super_block *sb) |
71 | { |
72 | struct iso_inode_info *ei; |
73 | ei = alloc_inode_sb(sb, cache: isofs_inode_cachep, GFP_KERNEL); |
74 | if (!ei) |
75 | return NULL; |
76 | return &ei->vfs_inode; |
77 | } |
78 | |
79 | static void isofs_free_inode(struct inode *inode) |
80 | { |
81 | kmem_cache_free(s: isofs_inode_cachep, objp: ISOFS_I(inode)); |
82 | } |
83 | |
84 | static void init_once(void *foo) |
85 | { |
86 | struct iso_inode_info *ei = foo; |
87 | |
88 | inode_init_once(&ei->vfs_inode); |
89 | } |
90 | |
91 | static int __init init_inodecache(void) |
92 | { |
93 | isofs_inode_cachep = kmem_cache_create(name: "isofs_inode_cache" , |
94 | size: sizeof(struct iso_inode_info), |
95 | align: 0, flags: (SLAB_RECLAIM_ACCOUNT| |
96 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
97 | ctor: init_once); |
98 | if (!isofs_inode_cachep) |
99 | return -ENOMEM; |
100 | return 0; |
101 | } |
102 | |
103 | static void destroy_inodecache(void) |
104 | { |
105 | /* |
106 | * Make sure all delayed rcu free inodes are flushed before we |
107 | * destroy cache. |
108 | */ |
109 | rcu_barrier(); |
110 | kmem_cache_destroy(s: isofs_inode_cachep); |
111 | } |
112 | |
113 | static int isofs_remount(struct super_block *sb, int *flags, char *data) |
114 | { |
115 | sync_filesystem(sb); |
116 | if (!(*flags & SB_RDONLY)) |
117 | return -EROFS; |
118 | return 0; |
119 | } |
120 | |
121 | static const struct super_operations isofs_sops = { |
122 | .alloc_inode = isofs_alloc_inode, |
123 | .free_inode = isofs_free_inode, |
124 | .put_super = isofs_put_super, |
125 | .statfs = isofs_statfs, |
126 | .remount_fs = isofs_remount, |
127 | .show_options = isofs_show_options, |
128 | }; |
129 | |
130 | |
131 | static const struct dentry_operations isofs_dentry_ops[] = { |
132 | { |
133 | .d_hash = isofs_hashi, |
134 | .d_compare = isofs_dentry_cmpi, |
135 | }, |
136 | #ifdef CONFIG_JOLIET |
137 | { |
138 | .d_hash = isofs_hash_ms, |
139 | .d_compare = isofs_dentry_cmp_ms, |
140 | }, |
141 | { |
142 | .d_hash = isofs_hashi_ms, |
143 | .d_compare = isofs_dentry_cmpi_ms, |
144 | }, |
145 | #endif |
146 | }; |
147 | |
148 | struct iso9660_options{ |
149 | unsigned int rock:1; |
150 | unsigned int joliet:1; |
151 | unsigned int cruft:1; |
152 | unsigned int hide:1; |
153 | unsigned int showassoc:1; |
154 | unsigned int nocompress:1; |
155 | unsigned int overriderockperm:1; |
156 | unsigned int uid_set:1; |
157 | unsigned int gid_set:1; |
158 | unsigned char map; |
159 | unsigned char check; |
160 | unsigned int blocksize; |
161 | umode_t fmode; |
162 | umode_t dmode; |
163 | kgid_t gid; |
164 | kuid_t uid; |
165 | char *iocharset; |
166 | /* LVE */ |
167 | s32 session; |
168 | s32 sbsector; |
169 | }; |
170 | |
171 | /* |
172 | * Compute the hash for the isofs name corresponding to the dentry. |
173 | */ |
174 | static int |
175 | isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
176 | { |
177 | const char *name; |
178 | int len; |
179 | char c; |
180 | unsigned long hash; |
181 | |
182 | len = qstr->len; |
183 | name = qstr->name; |
184 | if (ms) { |
185 | while (len && name[len-1] == '.') |
186 | len--; |
187 | } |
188 | |
189 | hash = init_name_hash(dentry); |
190 | while (len--) { |
191 | c = tolower(*name++); |
192 | hash = partial_name_hash(c, prevhash: hash); |
193 | } |
194 | qstr->hash = end_name_hash(hash); |
195 | |
196 | return 0; |
197 | } |
198 | |
199 | /* |
200 | * Compare of two isofs names. |
201 | */ |
202 | static int isofs_dentry_cmp_common( |
203 | unsigned int len, const char *str, |
204 | const struct qstr *name, int ms, int ci) |
205 | { |
206 | int alen, blen; |
207 | |
208 | /* A filename cannot end in '.' or we treat it like it has none */ |
209 | alen = name->len; |
210 | blen = len; |
211 | if (ms) { |
212 | while (alen && name->name[alen-1] == '.') |
213 | alen--; |
214 | while (blen && str[blen-1] == '.') |
215 | blen--; |
216 | } |
217 | if (alen == blen) { |
218 | if (ci) { |
219 | if (strncasecmp(s1: name->name, s2: str, n: alen) == 0) |
220 | return 0; |
221 | } else { |
222 | if (strncmp(name->name, str, alen) == 0) |
223 | return 0; |
224 | } |
225 | } |
226 | return 1; |
227 | } |
228 | |
229 | static int |
230 | isofs_hashi(const struct dentry *dentry, struct qstr *qstr) |
231 | { |
232 | return isofs_hashi_common(dentry, qstr, ms: 0); |
233 | } |
234 | |
235 | static int |
236 | isofs_dentry_cmpi(const struct dentry *dentry, |
237 | unsigned int len, const char *str, const struct qstr *name) |
238 | { |
239 | return isofs_dentry_cmp_common(len, str, name, ms: 0, ci: 1); |
240 | } |
241 | |
242 | #ifdef CONFIG_JOLIET |
243 | /* |
244 | * Compute the hash for the isofs name corresponding to the dentry. |
245 | */ |
246 | static int |
247 | isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) |
248 | { |
249 | const char *name; |
250 | int len; |
251 | |
252 | len = qstr->len; |
253 | name = qstr->name; |
254 | if (ms) { |
255 | while (len && name[len-1] == '.') |
256 | len--; |
257 | } |
258 | |
259 | qstr->hash = full_name_hash(salt: dentry, name, len); |
260 | |
261 | return 0; |
262 | } |
263 | |
264 | static int |
265 | isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) |
266 | { |
267 | return isofs_hash_common(dentry, qstr, ms: 1); |
268 | } |
269 | |
270 | static int |
271 | isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) |
272 | { |
273 | return isofs_hashi_common(dentry, qstr, ms: 1); |
274 | } |
275 | |
276 | static int |
277 | isofs_dentry_cmp_ms(const struct dentry *dentry, |
278 | unsigned int len, const char *str, const struct qstr *name) |
279 | { |
280 | return isofs_dentry_cmp_common(len, str, name, ms: 1, ci: 0); |
281 | } |
282 | |
283 | static int |
284 | isofs_dentry_cmpi_ms(const struct dentry *dentry, |
285 | unsigned int len, const char *str, const struct qstr *name) |
286 | { |
287 | return isofs_dentry_cmp_common(len, str, name, ms: 1, ci: 1); |
288 | } |
289 | #endif |
290 | |
291 | enum { |
292 | Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, |
293 | Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, |
294 | Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, |
295 | Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, |
296 | }; |
297 | |
298 | static const match_table_t tokens = { |
299 | {Opt_norock, "norock" }, |
300 | {Opt_nojoliet, "nojoliet" }, |
301 | {Opt_unhide, "unhide" }, |
302 | {Opt_hide, "hide" }, |
303 | {Opt_showassoc, "showassoc" }, |
304 | {Opt_cruft, "cruft" }, |
305 | {Opt_utf8, "utf8" }, |
306 | {Opt_iocharset, "iocharset=%s" }, |
307 | {Opt_map_a, "map=acorn" }, |
308 | {Opt_map_a, "map=a" }, |
309 | {Opt_map_n, "map=normal" }, |
310 | {Opt_map_n, "map=n" }, |
311 | {Opt_map_o, "map=off" }, |
312 | {Opt_map_o, "map=o" }, |
313 | {Opt_session, "session=%u" }, |
314 | {Opt_sb, "sbsector=%u" }, |
315 | {Opt_check_r, "check=relaxed" }, |
316 | {Opt_check_r, "check=r" }, |
317 | {Opt_check_s, "check=strict" }, |
318 | {Opt_check_s, "check=s" }, |
319 | {Opt_uid, "uid=%u" }, |
320 | {Opt_gid, "gid=%u" }, |
321 | {Opt_mode, "mode=%u" }, |
322 | {Opt_dmode, "dmode=%u" }, |
323 | {Opt_overriderockperm, "overriderockperm" }, |
324 | {Opt_block, "block=%u" }, |
325 | {Opt_ignore, "conv=binary" }, |
326 | {Opt_ignore, "conv=b" }, |
327 | {Opt_ignore, "conv=text" }, |
328 | {Opt_ignore, "conv=t" }, |
329 | {Opt_ignore, "conv=mtext" }, |
330 | {Opt_ignore, "conv=m" }, |
331 | {Opt_ignore, "conv=auto" }, |
332 | {Opt_ignore, "conv=a" }, |
333 | {Opt_nocompress, "nocompress" }, |
334 | {Opt_err, NULL} |
335 | }; |
336 | |
337 | static int parse_options(char *options, struct iso9660_options *popt) |
338 | { |
339 | char *p; |
340 | int option; |
341 | unsigned int uv; |
342 | |
343 | popt->map = 'n'; |
344 | popt->rock = 1; |
345 | popt->joliet = 1; |
346 | popt->cruft = 0; |
347 | popt->hide = 0; |
348 | popt->showassoc = 0; |
349 | popt->check = 'u'; /* unset */ |
350 | popt->nocompress = 0; |
351 | popt->blocksize = 1024; |
352 | popt->fmode = popt->dmode = ISOFS_INVALID_MODE; |
353 | popt->uid_set = 0; |
354 | popt->gid_set = 0; |
355 | popt->gid = GLOBAL_ROOT_GID; |
356 | popt->uid = GLOBAL_ROOT_UID; |
357 | popt->iocharset = NULL; |
358 | popt->overriderockperm = 0; |
359 | popt->session=-1; |
360 | popt->sbsector=-1; |
361 | if (!options) |
362 | return 1; |
363 | |
364 | while ((p = strsep(&options, "," )) != NULL) { |
365 | int token; |
366 | substring_t args[MAX_OPT_ARGS]; |
367 | unsigned n; |
368 | |
369 | if (!*p) |
370 | continue; |
371 | |
372 | token = match_token(p, tokens, args); |
373 | switch (token) { |
374 | case Opt_norock: |
375 | popt->rock = 0; |
376 | break; |
377 | case Opt_nojoliet: |
378 | popt->joliet = 0; |
379 | break; |
380 | case Opt_hide: |
381 | popt->hide = 1; |
382 | break; |
383 | case Opt_unhide: |
384 | case Opt_showassoc: |
385 | popt->showassoc = 1; |
386 | break; |
387 | case Opt_cruft: |
388 | popt->cruft = 1; |
389 | break; |
390 | #ifdef CONFIG_JOLIET |
391 | case Opt_utf8: |
392 | kfree(popt->iocharset); |
393 | popt->iocharset = kstrdup("utf8" , GFP_KERNEL); |
394 | if (!popt->iocharset) |
395 | return 0; |
396 | break; |
397 | case Opt_iocharset: |
398 | kfree(popt->iocharset); |
399 | popt->iocharset = match_strdup(&args[0]); |
400 | if (!popt->iocharset) |
401 | return 0; |
402 | break; |
403 | #endif |
404 | case Opt_map_a: |
405 | popt->map = 'a'; |
406 | break; |
407 | case Opt_map_o: |
408 | popt->map = 'o'; |
409 | break; |
410 | case Opt_map_n: |
411 | popt->map = 'n'; |
412 | break; |
413 | case Opt_session: |
414 | if (match_int(&args[0], &option)) |
415 | return 0; |
416 | n = option; |
417 | /* |
418 | * Track numbers are supposed to be in range 1-99, the |
419 | * mount option starts indexing at 0. |
420 | */ |
421 | if (n >= 99) |
422 | return 0; |
423 | popt->session = n + 1; |
424 | break; |
425 | case Opt_sb: |
426 | if (match_int(&args[0], &option)) |
427 | return 0; |
428 | popt->sbsector = option; |
429 | break; |
430 | case Opt_check_r: |
431 | popt->check = 'r'; |
432 | break; |
433 | case Opt_check_s: |
434 | popt->check = 's'; |
435 | break; |
436 | case Opt_ignore: |
437 | break; |
438 | case Opt_uid: |
439 | if (match_uint(&args[0], &uv)) |
440 | return 0; |
441 | popt->uid = make_kuid(current_user_ns(), uv); |
442 | if (!uid_valid(popt->uid)) |
443 | return 0; |
444 | popt->uid_set = 1; |
445 | break; |
446 | case Opt_gid: |
447 | if (match_uint(&args[0], &uv)) |
448 | return 0; |
449 | popt->gid = make_kgid(current_user_ns(), uv); |
450 | if (!gid_valid(popt->gid)) |
451 | return 0; |
452 | popt->gid_set = 1; |
453 | break; |
454 | case Opt_mode: |
455 | if (match_int(&args[0], &option)) |
456 | return 0; |
457 | popt->fmode = option; |
458 | break; |
459 | case Opt_dmode: |
460 | if (match_int(&args[0], &option)) |
461 | return 0; |
462 | popt->dmode = option; |
463 | break; |
464 | case Opt_overriderockperm: |
465 | popt->overriderockperm = 1; |
466 | break; |
467 | case Opt_block: |
468 | if (match_int(&args[0], &option)) |
469 | return 0; |
470 | n = option; |
471 | if (n != 512 && n != 1024 && n != 2048) |
472 | return 0; |
473 | popt->blocksize = n; |
474 | break; |
475 | case Opt_nocompress: |
476 | popt->nocompress = 1; |
477 | break; |
478 | default: |
479 | return 0; |
480 | } |
481 | } |
482 | return 1; |
483 | } |
484 | |
485 | /* |
486 | * Display the mount options in /proc/mounts. |
487 | */ |
488 | static int isofs_show_options(struct seq_file *m, struct dentry *root) |
489 | { |
490 | struct isofs_sb_info *sbi = ISOFS_SB(sb: root->d_sb); |
491 | |
492 | if (!sbi->s_rock) seq_puts(m, s: ",norock" ); |
493 | else if (!sbi->s_joliet_level) seq_puts(m, s: ",nojoliet" ); |
494 | if (sbi->s_cruft) seq_puts(m, s: ",cruft" ); |
495 | if (sbi->s_hide) seq_puts(m, s: ",hide" ); |
496 | if (sbi->s_nocompress) seq_puts(m, s: ",nocompress" ); |
497 | if (sbi->s_overriderockperm) seq_puts(m, s: ",overriderockperm" ); |
498 | if (sbi->s_showassoc) seq_puts(m, s: ",showassoc" ); |
499 | |
500 | if (sbi->s_check) seq_printf(m, fmt: ",check=%c" , sbi->s_check); |
501 | if (sbi->s_mapping) seq_printf(m, fmt: ",map=%c" , sbi->s_mapping); |
502 | if (sbi->s_session != 255) seq_printf(m, fmt: ",session=%u" , sbi->s_session - 1); |
503 | if (sbi->s_sbsector != -1) seq_printf(m, fmt: ",sbsector=%u" , sbi->s_sbsector); |
504 | |
505 | if (root->d_sb->s_blocksize != 1024) |
506 | seq_printf(m, fmt: ",blocksize=%lu" , root->d_sb->s_blocksize); |
507 | |
508 | if (sbi->s_uid_set) |
509 | seq_printf(m, fmt: ",uid=%u" , |
510 | from_kuid_munged(to: &init_user_ns, uid: sbi->s_uid)); |
511 | if (sbi->s_gid_set) |
512 | seq_printf(m, fmt: ",gid=%u" , |
513 | from_kgid_munged(to: &init_user_ns, gid: sbi->s_gid)); |
514 | |
515 | if (sbi->s_dmode != ISOFS_INVALID_MODE) |
516 | seq_printf(m, fmt: ",dmode=%o" , sbi->s_dmode); |
517 | if (sbi->s_fmode != ISOFS_INVALID_MODE) |
518 | seq_printf(m, fmt: ",fmode=%o" , sbi->s_fmode); |
519 | |
520 | #ifdef CONFIG_JOLIET |
521 | if (sbi->s_nls_iocharset) |
522 | seq_printf(m, fmt: ",iocharset=%s" , sbi->s_nls_iocharset->charset); |
523 | else |
524 | seq_puts(m, s: ",iocharset=utf8" ); |
525 | #endif |
526 | return 0; |
527 | } |
528 | |
529 | /* |
530 | * look if the driver can tell the multi session redirection value |
531 | * |
532 | * don't change this if you don't know what you do, please! |
533 | * Multisession is legal only with XA disks. |
534 | * A non-XA disk with more than one volume descriptor may do it right, but |
535 | * usually is written in a nowhere standardized "multi-partition" manner. |
536 | * Multisession uses absolute addressing (solely the first frame of the whole |
537 | * track is #0), multi-partition uses relative addressing (each first frame of |
538 | * each track is #0), and a track is not a session. |
539 | * |
540 | * A broken CDwriter software or drive firmware does not set new standards, |
541 | * at least not if conflicting with the existing ones. |
542 | * |
543 | * emoenke@gwdg.de |
544 | */ |
545 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 |
546 | |
547 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
548 | { |
549 | struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk); |
550 | unsigned int vol_desc_start = 0; |
551 | |
552 | if (session > 0) { |
553 | struct cdrom_tocentry te; |
554 | |
555 | if (!cdi) |
556 | return 0; |
557 | |
558 | te.cdte_track = session; |
559 | te.cdte_format = CDROM_LBA; |
560 | if (cdrom_read_tocentry(cdi, entry: &te) == 0) { |
561 | printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n" , |
562 | session, te.cdte_addr.lba, |
563 | te.cdte_ctrl & CDROM_DATA_TRACK); |
564 | if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4) |
565 | return te.cdte_addr.lba; |
566 | } |
567 | |
568 | printk(KERN_ERR "ISOFS: Invalid session number or type of track\n" ); |
569 | } |
570 | |
571 | if (cdi) { |
572 | struct cdrom_multisession ms_info; |
573 | |
574 | ms_info.addr_format = CDROM_LBA; |
575 | if (cdrom_multisession(cdi, info: &ms_info) == 0) { |
576 | #if WE_OBEY_THE_WRITTEN_STANDARDS |
577 | /* necessary for a valid ms_info.addr */ |
578 | if (ms_info.xa_flag) |
579 | #endif |
580 | vol_desc_start = ms_info.addr.lba; |
581 | } |
582 | } |
583 | |
584 | return vol_desc_start; |
585 | } |
586 | |
587 | /* |
588 | * Check if root directory is empty (has less than 3 files). |
589 | * |
590 | * Used to detect broken CDs where ISO root directory is empty but Joliet root |
591 | * directory is OK. If such CD has Rock Ridge extensions, they will be disabled |
592 | * (and Joliet used instead) or else no files would be visible. |
593 | */ |
594 | static bool rootdir_empty(struct super_block *sb, unsigned long block) |
595 | { |
596 | int offset = 0, files = 0, de_len; |
597 | struct iso_directory_record *de; |
598 | struct buffer_head *bh; |
599 | |
600 | bh = sb_bread(sb, block); |
601 | if (!bh) |
602 | return true; |
603 | while (files < 3) { |
604 | de = (struct iso_directory_record *) (bh->b_data + offset); |
605 | de_len = *(unsigned char *) de; |
606 | if (de_len == 0) |
607 | break; |
608 | files++; |
609 | offset += de_len; |
610 | } |
611 | brelse(bh); |
612 | return files < 3; |
613 | } |
614 | |
615 | /* |
616 | * Initialize the superblock and read the root inode. |
617 | */ |
618 | static int isofs_fill_super(struct super_block *s, void *data, int silent) |
619 | { |
620 | struct buffer_head *bh = NULL, *pri_bh = NULL; |
621 | struct hs_primary_descriptor *h_pri = NULL; |
622 | struct iso_primary_descriptor *pri = NULL; |
623 | struct iso_supplementary_descriptor *sec = NULL; |
624 | struct iso_directory_record *rootp; |
625 | struct inode *inode; |
626 | struct iso9660_options opt; |
627 | struct isofs_sb_info *sbi; |
628 | unsigned long first_data_zone; |
629 | int joliet_level = 0; |
630 | int iso_blknum, block; |
631 | int orig_zonesize; |
632 | int table, error = -EINVAL; |
633 | unsigned int vol_desc_start; |
634 | |
635 | sbi = kzalloc(size: sizeof(*sbi), GFP_KERNEL); |
636 | if (!sbi) |
637 | return -ENOMEM; |
638 | s->s_fs_info = sbi; |
639 | |
640 | if (!parse_options(options: (char *)data, popt: &opt)) |
641 | goto out_freesbi; |
642 | |
643 | /* |
644 | * First of all, get the hardware blocksize for this device. |
645 | * If we don't know what it is, or the hardware blocksize is |
646 | * larger than the blocksize the user specified, then use |
647 | * that value. |
648 | */ |
649 | /* |
650 | * What if bugger tells us to go beyond page size? |
651 | */ |
652 | if (bdev_logical_block_size(bdev: s->s_bdev) > 2048) { |
653 | printk(KERN_WARNING |
654 | "ISOFS: unsupported/invalid hardware sector size %d\n" , |
655 | bdev_logical_block_size(s->s_bdev)); |
656 | goto out_freesbi; |
657 | } |
658 | opt.blocksize = sb_min_blocksize(s, opt.blocksize); |
659 | |
660 | sbi->s_high_sierra = 0; /* default is iso9660 */ |
661 | sbi->s_session = opt.session; |
662 | sbi->s_sbsector = opt.sbsector; |
663 | |
664 | vol_desc_start = (opt.sbsector != -1) ? |
665 | opt.sbsector : isofs_get_last_session(sb: s,session: opt.session); |
666 | |
667 | for (iso_blknum = vol_desc_start+16; |
668 | iso_blknum < vol_desc_start+100; iso_blknum++) { |
669 | struct hs_volume_descriptor *hdp; |
670 | struct iso_volume_descriptor *vdp; |
671 | |
672 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); |
673 | if (!(bh = sb_bread(sb: s, block))) |
674 | goto out_no_read; |
675 | |
676 | vdp = (struct iso_volume_descriptor *)bh->b_data; |
677 | hdp = (struct hs_volume_descriptor *)bh->b_data; |
678 | |
679 | /* |
680 | * Due to the overlapping physical location of the descriptors, |
681 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure |
682 | * proper identification in this case, we first check for ISO. |
683 | */ |
684 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { |
685 | if (isonum_711(p: vdp->type) == ISO_VD_END) |
686 | break; |
687 | if (isonum_711(p: vdp->type) == ISO_VD_PRIMARY) { |
688 | if (!pri) { |
689 | pri = (struct iso_primary_descriptor *)vdp; |
690 | /* Save the buffer in case we need it ... */ |
691 | pri_bh = bh; |
692 | bh = NULL; |
693 | } |
694 | } |
695 | #ifdef CONFIG_JOLIET |
696 | else if (isonum_711(p: vdp->type) == ISO_VD_SUPPLEMENTARY) { |
697 | sec = (struct iso_supplementary_descriptor *)vdp; |
698 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { |
699 | if (opt.joliet) { |
700 | if (sec->escape[2] == 0x40) |
701 | joliet_level = 1; |
702 | else if (sec->escape[2] == 0x43) |
703 | joliet_level = 2; |
704 | else if (sec->escape[2] == 0x45) |
705 | joliet_level = 3; |
706 | |
707 | printk(KERN_DEBUG "ISO 9660 Extensions: " |
708 | "Microsoft Joliet Level %d\n" , |
709 | joliet_level); |
710 | } |
711 | goto root_found; |
712 | } else { |
713 | /* Unknown supplementary volume descriptor */ |
714 | sec = NULL; |
715 | } |
716 | } |
717 | #endif |
718 | } else { |
719 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { |
720 | if (isonum_711(p: hdp->type) != ISO_VD_PRIMARY) |
721 | goto out_freebh; |
722 | |
723 | sbi->s_high_sierra = 1; |
724 | opt.rock = 0; |
725 | h_pri = (struct hs_primary_descriptor *)vdp; |
726 | goto root_found; |
727 | } |
728 | } |
729 | |
730 | /* Just skip any volume descriptors we don't recognize */ |
731 | |
732 | brelse(bh); |
733 | bh = NULL; |
734 | } |
735 | /* |
736 | * If we fall through, either no volume descriptor was found, |
737 | * or else we passed a primary descriptor looking for others. |
738 | */ |
739 | if (!pri) |
740 | goto out_unknown_format; |
741 | brelse(bh); |
742 | bh = pri_bh; |
743 | pri_bh = NULL; |
744 | |
745 | root_found: |
746 | /* We don't support read-write mounts */ |
747 | if (!sb_rdonly(sb: s)) { |
748 | error = -EACCES; |
749 | goto out_freebh; |
750 | } |
751 | |
752 | if (joliet_level && (!pri || !opt.rock)) { |
753 | /* This is the case of Joliet with the norock mount flag. |
754 | * A disc with both Joliet and Rock Ridge is handled later |
755 | */ |
756 | pri = (struct iso_primary_descriptor *) sec; |
757 | } |
758 | |
759 | if(sbi->s_high_sierra){ |
760 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; |
761 | sbi->s_nzones = isonum_733(p: h_pri->volume_space_size); |
762 | sbi->s_log_zone_size = isonum_723(p: h_pri->logical_block_size); |
763 | sbi->s_max_size = isonum_733(p: h_pri->volume_space_size); |
764 | } else { |
765 | if (!pri) |
766 | goto out_freebh; |
767 | rootp = (struct iso_directory_record *) pri->root_directory_record; |
768 | sbi->s_nzones = isonum_733(p: pri->volume_space_size); |
769 | sbi->s_log_zone_size = isonum_723(p: pri->logical_block_size); |
770 | sbi->s_max_size = isonum_733(p: pri->volume_space_size); |
771 | } |
772 | |
773 | sbi->s_ninodes = 0; /* No way to figure this out easily */ |
774 | |
775 | orig_zonesize = sbi->s_log_zone_size; |
776 | /* |
777 | * If the zone size is smaller than the hardware sector size, |
778 | * this is a fatal error. This would occur if the disc drive |
779 | * had sectors that were 2048 bytes, but the filesystem had |
780 | * blocks that were 512 bytes (which should only very rarely |
781 | * happen.) |
782 | */ |
783 | if (orig_zonesize < opt.blocksize) |
784 | goto out_bad_size; |
785 | |
786 | /* RDE: convert log zone size to bit shift */ |
787 | switch (sbi->s_log_zone_size) { |
788 | case 512: sbi->s_log_zone_size = 9; break; |
789 | case 1024: sbi->s_log_zone_size = 10; break; |
790 | case 2048: sbi->s_log_zone_size = 11; break; |
791 | |
792 | default: |
793 | goto out_bad_zone_size; |
794 | } |
795 | |
796 | s->s_magic = ISOFS_SUPER_MAGIC; |
797 | |
798 | /* |
799 | * With multi-extent files, file size is only limited by the maximum |
800 | * size of a file system, which is 8 TB. |
801 | */ |
802 | s->s_maxbytes = 0x80000000000LL; |
803 | |
804 | /* ECMA-119 timestamp from 1900/1/1 with tz offset */ |
805 | s->s_time_min = mktime64(year: 1900, mon: 1, day: 1, hour: 0, min: 0, sec: 0) - MAX_TZ_OFFSET; |
806 | s->s_time_max = mktime64(U8_MAX+1900, mon: 12, day: 31, hour: 23, min: 59, sec: 59) + MAX_TZ_OFFSET; |
807 | |
808 | /* Set this for reference. Its not currently used except on write |
809 | which we don't have .. */ |
810 | |
811 | first_data_zone = isonum_733(p: rootp->extent) + |
812 | isonum_711(p: rootp->ext_attr_length); |
813 | sbi->s_firstdatazone = first_data_zone; |
814 | #ifndef BEQUIET |
815 | printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n" , |
816 | sbi->s_max_size, 1UL << sbi->s_log_zone_size); |
817 | printk(KERN_DEBUG "ISOFS: First datazone:%ld\n" , sbi->s_firstdatazone); |
818 | if(sbi->s_high_sierra) |
819 | printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n" ); |
820 | #endif |
821 | |
822 | /* |
823 | * If the Joliet level is set, we _may_ decide to use the |
824 | * secondary descriptor, but can't be sure until after we |
825 | * read the root inode. But before reading the root inode |
826 | * we may need to change the device blocksize, and would |
827 | * rather release the old buffer first. So, we cache the |
828 | * first_data_zone value from the secondary descriptor. |
829 | */ |
830 | if (joliet_level) { |
831 | pri = (struct iso_primary_descriptor *) sec; |
832 | rootp = (struct iso_directory_record *) |
833 | pri->root_directory_record; |
834 | first_data_zone = isonum_733(p: rootp->extent) + |
835 | isonum_711(p: rootp->ext_attr_length); |
836 | } |
837 | |
838 | /* |
839 | * We're all done using the volume descriptor, and may need |
840 | * to change the device blocksize, so release the buffer now. |
841 | */ |
842 | brelse(bh: pri_bh); |
843 | brelse(bh); |
844 | |
845 | /* |
846 | * Force the blocksize to 512 for 512 byte sectors. The file |
847 | * read primitives really get it wrong in a bad way if we don't |
848 | * do this. |
849 | * |
850 | * Note - we should never be setting the blocksize to something |
851 | * less than the hardware sector size for the device. If we |
852 | * do, we would end up having to read larger buffers and split |
853 | * out portions to satisfy requests. |
854 | * |
855 | * Note2- the idea here is that we want to deal with the optimal |
856 | * zonesize in the filesystem. If we have it set to something less, |
857 | * then we have horrible problems with trying to piece together |
858 | * bits of adjacent blocks in order to properly read directory |
859 | * entries. By forcing the blocksize in this way, we ensure |
860 | * that we will never be required to do this. |
861 | */ |
862 | sb_set_blocksize(s, orig_zonesize); |
863 | |
864 | sbi->s_nls_iocharset = NULL; |
865 | |
866 | #ifdef CONFIG_JOLIET |
867 | if (joliet_level) { |
868 | char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; |
869 | if (strcmp(p, "utf8" ) != 0) { |
870 | sbi->s_nls_iocharset = opt.iocharset ? |
871 | load_nls(charset: opt.iocharset) : load_nls_default(); |
872 | if (!sbi->s_nls_iocharset) |
873 | goto out_freesbi; |
874 | } |
875 | } |
876 | #endif |
877 | s->s_op = &isofs_sops; |
878 | s->s_export_op = &isofs_export_ops; |
879 | sbi->s_mapping = opt.map; |
880 | sbi->s_rock = (opt.rock ? 2 : 0); |
881 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ |
882 | sbi->s_cruft = opt.cruft; |
883 | sbi->s_hide = opt.hide; |
884 | sbi->s_showassoc = opt.showassoc; |
885 | sbi->s_uid = opt.uid; |
886 | sbi->s_gid = opt.gid; |
887 | sbi->s_uid_set = opt.uid_set; |
888 | sbi->s_gid_set = opt.gid_set; |
889 | sbi->s_nocompress = opt.nocompress; |
890 | sbi->s_overriderockperm = opt.overriderockperm; |
891 | /* |
892 | * It would be incredibly stupid to allow people to mark every file |
893 | * on the disk as suid, so we merely allow them to set the default |
894 | * permissions. |
895 | */ |
896 | if (opt.fmode != ISOFS_INVALID_MODE) |
897 | sbi->s_fmode = opt.fmode & 0777; |
898 | else |
899 | sbi->s_fmode = ISOFS_INVALID_MODE; |
900 | if (opt.dmode != ISOFS_INVALID_MODE) |
901 | sbi->s_dmode = opt.dmode & 0777; |
902 | else |
903 | sbi->s_dmode = ISOFS_INVALID_MODE; |
904 | |
905 | /* |
906 | * Read the root inode, which _may_ result in changing |
907 | * the s_rock flag. Once we have the final s_rock value, |
908 | * we then decide whether to use the Joliet descriptor. |
909 | */ |
910 | inode = isofs_iget(sb: s, block: sbi->s_firstdatazone, offset: 0); |
911 | if (IS_ERR(ptr: inode)) |
912 | goto out_no_root; |
913 | |
914 | /* |
915 | * Fix for broken CDs with Rock Ridge and empty ISO root directory but |
916 | * correct Joliet root directory. |
917 | */ |
918 | if (sbi->s_rock == 1 && joliet_level && |
919 | rootdir_empty(sb: s, block: sbi->s_firstdatazone)) { |
920 | printk(KERN_NOTICE |
921 | "ISOFS: primary root directory is empty. " |
922 | "Disabling Rock Ridge and switching to Joliet." ); |
923 | sbi->s_rock = 0; |
924 | } |
925 | |
926 | /* |
927 | * If this disk has both Rock Ridge and Joliet on it, then we |
928 | * want to use Rock Ridge by default. This can be overridden |
929 | * by using the norock mount option. There is still one other |
930 | * possibility that is not taken into account: a Rock Ridge |
931 | * CD with Unicode names. Until someone sees such a beast, it |
932 | * will not be supported. |
933 | */ |
934 | if (sbi->s_rock == 1) { |
935 | joliet_level = 0; |
936 | } else if (joliet_level) { |
937 | sbi->s_rock = 0; |
938 | if (sbi->s_firstdatazone != first_data_zone) { |
939 | sbi->s_firstdatazone = first_data_zone; |
940 | printk(KERN_DEBUG |
941 | "ISOFS: changing to secondary root\n" ); |
942 | iput(inode); |
943 | inode = isofs_iget(sb: s, block: sbi->s_firstdatazone, offset: 0); |
944 | if (IS_ERR(ptr: inode)) |
945 | goto out_no_root; |
946 | } |
947 | } |
948 | |
949 | if (opt.check == 'u') { |
950 | /* Only Joliet is case insensitive by default */ |
951 | if (joliet_level) |
952 | opt.check = 'r'; |
953 | else |
954 | opt.check = 's'; |
955 | } |
956 | sbi->s_joliet_level = joliet_level; |
957 | |
958 | /* Make sure the root inode is a directory */ |
959 | if (!S_ISDIR(inode->i_mode)) { |
960 | printk(KERN_WARNING |
961 | "isofs_fill_super: root inode is not a directory. " |
962 | "Corrupted media?\n" ); |
963 | goto out_iput; |
964 | } |
965 | |
966 | table = 0; |
967 | if (joliet_level) |
968 | table += 2; |
969 | if (opt.check == 'r') |
970 | table++; |
971 | sbi->s_check = opt.check; |
972 | |
973 | if (table) |
974 | s->s_d_op = &isofs_dentry_ops[table - 1]; |
975 | |
976 | /* get the root dentry */ |
977 | s->s_root = d_make_root(inode); |
978 | if (!(s->s_root)) { |
979 | error = -ENOMEM; |
980 | goto out_no_inode; |
981 | } |
982 | |
983 | kfree(objp: opt.iocharset); |
984 | |
985 | return 0; |
986 | |
987 | /* |
988 | * Display error messages and free resources. |
989 | */ |
990 | out_iput: |
991 | iput(inode); |
992 | goto out_no_inode; |
993 | out_no_root: |
994 | error = PTR_ERR(ptr: inode); |
995 | if (error != -ENOMEM) |
996 | printk(KERN_WARNING "%s: get root inode failed\n" , __func__); |
997 | out_no_inode: |
998 | #ifdef CONFIG_JOLIET |
999 | unload_nls(sbi->s_nls_iocharset); |
1000 | #endif |
1001 | goto out_freesbi; |
1002 | out_no_read: |
1003 | printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n" , |
1004 | __func__, s->s_id, iso_blknum, block); |
1005 | goto out_freebh; |
1006 | out_bad_zone_size: |
1007 | printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n" , |
1008 | sbi->s_log_zone_size); |
1009 | goto out_freebh; |
1010 | out_bad_size: |
1011 | printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n" , |
1012 | orig_zonesize, opt.blocksize); |
1013 | goto out_freebh; |
1014 | out_unknown_format: |
1015 | if (!silent) |
1016 | printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n" ); |
1017 | |
1018 | out_freebh: |
1019 | brelse(bh); |
1020 | brelse(bh: pri_bh); |
1021 | out_freesbi: |
1022 | kfree(objp: opt.iocharset); |
1023 | kfree(objp: sbi); |
1024 | s->s_fs_info = NULL; |
1025 | return error; |
1026 | } |
1027 | |
1028 | static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) |
1029 | { |
1030 | struct super_block *sb = dentry->d_sb; |
1031 | u64 id = huge_encode_dev(dev: sb->s_bdev->bd_dev); |
1032 | |
1033 | buf->f_type = ISOFS_SUPER_MAGIC; |
1034 | buf->f_bsize = sb->s_blocksize; |
1035 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones |
1036 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); |
1037 | buf->f_bfree = 0; |
1038 | buf->f_bavail = 0; |
1039 | buf->f_files = ISOFS_SB(sb)->s_ninodes; |
1040 | buf->f_ffree = 0; |
1041 | buf->f_fsid = u64_to_fsid(v: id); |
1042 | buf->f_namelen = NAME_MAX; |
1043 | return 0; |
1044 | } |
1045 | |
1046 | /* |
1047 | * Get a set of blocks; filling in buffer_heads if already allocated |
1048 | * or getblk() if they are not. Returns the number of blocks inserted |
1049 | * (-ve == error.) |
1050 | */ |
1051 | int isofs_get_blocks(struct inode *inode, sector_t iblock, |
1052 | struct buffer_head **bh, unsigned long nblocks) |
1053 | { |
1054 | unsigned long b_off = iblock; |
1055 | unsigned offset, sect_size; |
1056 | unsigned int firstext; |
1057 | unsigned long nextblk, nextoff; |
1058 | int section, rv, error; |
1059 | struct iso_inode_info *ei = ISOFS_I(inode); |
1060 | |
1061 | error = -EIO; |
1062 | rv = 0; |
1063 | if (iblock != b_off) { |
1064 | printk(KERN_DEBUG "%s: block number too large\n" , __func__); |
1065 | goto abort; |
1066 | } |
1067 | |
1068 | |
1069 | offset = 0; |
1070 | firstext = ei->i_first_extent; |
1071 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); |
1072 | nextblk = ei->i_next_section_block; |
1073 | nextoff = ei->i_next_section_offset; |
1074 | section = 0; |
1075 | |
1076 | while (nblocks) { |
1077 | /* If we are *way* beyond the end of the file, print a message. |
1078 | * Access beyond the end of the file up to the next page boundary |
1079 | * is normal, however because of the way the page cache works. |
1080 | * In this case, we just return 0 so that we can properly fill |
1081 | * the page with useless information without generating any |
1082 | * I/O errors. |
1083 | */ |
1084 | if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { |
1085 | printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n" , |
1086 | __func__, b_off, |
1087 | (unsigned long long)inode->i_size); |
1088 | goto abort; |
1089 | } |
1090 | |
1091 | /* On the last section, nextblk == 0, section size is likely to |
1092 | * exceed sect_size by a partial block, and access beyond the |
1093 | * end of the file will reach beyond the section size, too. |
1094 | */ |
1095 | while (nextblk && (b_off >= (offset + sect_size))) { |
1096 | struct inode *ninode; |
1097 | |
1098 | offset += sect_size; |
1099 | ninode = isofs_iget(sb: inode->i_sb, block: nextblk, offset: nextoff); |
1100 | if (IS_ERR(ptr: ninode)) { |
1101 | error = PTR_ERR(ptr: ninode); |
1102 | goto abort; |
1103 | } |
1104 | firstext = ISOFS_I(inode: ninode)->i_first_extent; |
1105 | sect_size = ISOFS_I(inode: ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); |
1106 | nextblk = ISOFS_I(inode: ninode)->i_next_section_block; |
1107 | nextoff = ISOFS_I(inode: ninode)->i_next_section_offset; |
1108 | iput(ninode); |
1109 | |
1110 | if (++section > 100) { |
1111 | printk(KERN_DEBUG "%s: More than 100 file sections ?!?" |
1112 | " aborting...\n" , __func__); |
1113 | printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u " |
1114 | "nextblk=%lu nextoff=%lu\n" , __func__, |
1115 | b_off, firstext, (unsigned) sect_size, |
1116 | nextblk, nextoff); |
1117 | goto abort; |
1118 | } |
1119 | } |
1120 | |
1121 | if (*bh) { |
1122 | map_bh(bh: *bh, sb: inode->i_sb, block: firstext + b_off - offset); |
1123 | } else { |
1124 | *bh = sb_getblk(sb: inode->i_sb, block: firstext+b_off-offset); |
1125 | if (!*bh) |
1126 | goto abort; |
1127 | } |
1128 | bh++; /* Next buffer head */ |
1129 | b_off++; /* Next buffer offset */ |
1130 | nblocks--; |
1131 | rv++; |
1132 | } |
1133 | |
1134 | error = 0; |
1135 | abort: |
1136 | return rv != 0 ? rv : error; |
1137 | } |
1138 | |
1139 | /* |
1140 | * Used by the standard interfaces. |
1141 | */ |
1142 | static int isofs_get_block(struct inode *inode, sector_t iblock, |
1143 | struct buffer_head *bh_result, int create) |
1144 | { |
1145 | int ret; |
1146 | |
1147 | if (create) { |
1148 | printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n" , __func__); |
1149 | return -EROFS; |
1150 | } |
1151 | |
1152 | ret = isofs_get_blocks(inode, iblock, bh: &bh_result, nblocks: 1); |
1153 | return ret < 0 ? ret : 0; |
1154 | } |
1155 | |
1156 | static int isofs_bmap(struct inode *inode, sector_t block) |
1157 | { |
1158 | struct buffer_head dummy; |
1159 | int error; |
1160 | |
1161 | dummy.b_state = 0; |
1162 | dummy.b_blocknr = -1000; |
1163 | error = isofs_get_block(inode, iblock: block, bh_result: &dummy, create: 0); |
1164 | if (!error) |
1165 | return dummy.b_blocknr; |
1166 | return 0; |
1167 | } |
1168 | |
1169 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) |
1170 | { |
1171 | sector_t blknr = isofs_bmap(inode, block); |
1172 | if (!blknr) |
1173 | return NULL; |
1174 | return sb_bread(sb: inode->i_sb, block: blknr); |
1175 | } |
1176 | |
1177 | static int isofs_read_folio(struct file *file, struct folio *folio) |
1178 | { |
1179 | return mpage_read_folio(folio, get_block: isofs_get_block); |
1180 | } |
1181 | |
1182 | static void isofs_readahead(struct readahead_control *rac) |
1183 | { |
1184 | mpage_readahead(rac, get_block: isofs_get_block); |
1185 | } |
1186 | |
1187 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) |
1188 | { |
1189 | return generic_block_bmap(mapping,block,isofs_get_block); |
1190 | } |
1191 | |
1192 | static const struct address_space_operations isofs_aops = { |
1193 | .read_folio = isofs_read_folio, |
1194 | .readahead = isofs_readahead, |
1195 | .bmap = _isofs_bmap |
1196 | }; |
1197 | |
1198 | static int isofs_read_level3_size(struct inode *inode) |
1199 | { |
1200 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); |
1201 | int high_sierra = ISOFS_SB(sb: inode->i_sb)->s_high_sierra; |
1202 | struct buffer_head *bh = NULL; |
1203 | unsigned long block, offset, block_saved, offset_saved; |
1204 | int i = 0; |
1205 | int more_entries = 0; |
1206 | struct iso_directory_record *tmpde = NULL; |
1207 | struct iso_inode_info *ei = ISOFS_I(inode); |
1208 | |
1209 | inode->i_size = 0; |
1210 | |
1211 | /* The first 16 blocks are reserved as the System Area. Thus, |
1212 | * no inodes can appear in block 0. We use this to flag that |
1213 | * this is the last section. */ |
1214 | ei->i_next_section_block = 0; |
1215 | ei->i_next_section_offset = 0; |
1216 | |
1217 | block = ei->i_iget5_block; |
1218 | offset = ei->i_iget5_offset; |
1219 | |
1220 | do { |
1221 | struct iso_directory_record *de; |
1222 | unsigned int de_len; |
1223 | |
1224 | if (!bh) { |
1225 | bh = sb_bread(sb: inode->i_sb, block); |
1226 | if (!bh) |
1227 | goto out_noread; |
1228 | } |
1229 | de = (struct iso_directory_record *) (bh->b_data + offset); |
1230 | de_len = *(unsigned char *) de; |
1231 | |
1232 | if (de_len == 0) { |
1233 | brelse(bh); |
1234 | bh = NULL; |
1235 | ++block; |
1236 | offset = 0; |
1237 | continue; |
1238 | } |
1239 | |
1240 | block_saved = block; |
1241 | offset_saved = offset; |
1242 | offset += de_len; |
1243 | |
1244 | /* Make sure we have a full directory entry */ |
1245 | if (offset >= bufsize) { |
1246 | int slop = bufsize - offset + de_len; |
1247 | if (!tmpde) { |
1248 | tmpde = kmalloc(size: 256, GFP_KERNEL); |
1249 | if (!tmpde) |
1250 | goto out_nomem; |
1251 | } |
1252 | memcpy(tmpde, de, slop); |
1253 | offset &= bufsize - 1; |
1254 | block++; |
1255 | brelse(bh); |
1256 | bh = NULL; |
1257 | if (offset) { |
1258 | bh = sb_bread(sb: inode->i_sb, block); |
1259 | if (!bh) |
1260 | goto out_noread; |
1261 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
1262 | } |
1263 | de = tmpde; |
1264 | } |
1265 | |
1266 | inode->i_size += isonum_733(p: de->size); |
1267 | if (i == 1) { |
1268 | ei->i_next_section_block = block_saved; |
1269 | ei->i_next_section_offset = offset_saved; |
1270 | } |
1271 | |
1272 | more_entries = de->flags[-high_sierra] & 0x80; |
1273 | |
1274 | i++; |
1275 | if (i > 100) |
1276 | goto out_toomany; |
1277 | } while (more_entries); |
1278 | out: |
1279 | kfree(objp: tmpde); |
1280 | brelse(bh); |
1281 | return 0; |
1282 | |
1283 | out_nomem: |
1284 | brelse(bh); |
1285 | return -ENOMEM; |
1286 | |
1287 | out_noread: |
1288 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n" , block); |
1289 | kfree(objp: tmpde); |
1290 | return -EIO; |
1291 | |
1292 | out_toomany: |
1293 | printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" |
1294 | "isofs_read_level3_size: inode=%lu\n" , |
1295 | __func__, inode->i_ino); |
1296 | goto out; |
1297 | } |
1298 | |
1299 | static int isofs_read_inode(struct inode *inode, int relocated) |
1300 | { |
1301 | struct super_block *sb = inode->i_sb; |
1302 | struct isofs_sb_info *sbi = ISOFS_SB(sb); |
1303 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); |
1304 | unsigned long block; |
1305 | int high_sierra = sbi->s_high_sierra; |
1306 | struct buffer_head *bh; |
1307 | struct iso_directory_record *de; |
1308 | struct iso_directory_record *tmpde = NULL; |
1309 | unsigned int de_len; |
1310 | unsigned long offset; |
1311 | struct iso_inode_info *ei = ISOFS_I(inode); |
1312 | int ret = -EIO; |
1313 | |
1314 | block = ei->i_iget5_block; |
1315 | bh = sb_bread(sb: inode->i_sb, block); |
1316 | if (!bh) |
1317 | goto out_badread; |
1318 | |
1319 | offset = ei->i_iget5_offset; |
1320 | |
1321 | de = (struct iso_directory_record *) (bh->b_data + offset); |
1322 | de_len = *(unsigned char *) de; |
1323 | if (de_len < sizeof(struct iso_directory_record)) |
1324 | goto fail; |
1325 | |
1326 | if (offset + de_len > bufsize) { |
1327 | int frag1 = bufsize - offset; |
1328 | |
1329 | tmpde = kmalloc(size: de_len, GFP_KERNEL); |
1330 | if (!tmpde) { |
1331 | ret = -ENOMEM; |
1332 | goto fail; |
1333 | } |
1334 | memcpy(tmpde, bh->b_data + offset, frag1); |
1335 | brelse(bh); |
1336 | bh = sb_bread(sb: inode->i_sb, block: ++block); |
1337 | if (!bh) |
1338 | goto out_badread; |
1339 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); |
1340 | de = tmpde; |
1341 | } |
1342 | |
1343 | inode->i_ino = isofs_get_ino(block: ei->i_iget5_block, |
1344 | offset: ei->i_iget5_offset, |
1345 | ISOFS_BUFFER_BITS(inode)); |
1346 | |
1347 | /* Assume it is a normal-format file unless told otherwise */ |
1348 | ei->i_file_format = isofs_file_normal; |
1349 | |
1350 | if (de->flags[-high_sierra] & 2) { |
1351 | if (sbi->s_dmode != ISOFS_INVALID_MODE) |
1352 | inode->i_mode = S_IFDIR | sbi->s_dmode; |
1353 | else |
1354 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; |
1355 | set_nlink(inode, nlink: 1); /* |
1356 | * Set to 1. We know there are 2, but |
1357 | * the find utility tries to optimize |
1358 | * if it is 2, and it screws up. It is |
1359 | * easier to give 1 which tells find to |
1360 | * do it the hard way. |
1361 | */ |
1362 | } else { |
1363 | if (sbi->s_fmode != ISOFS_INVALID_MODE) { |
1364 | inode->i_mode = S_IFREG | sbi->s_fmode; |
1365 | } else { |
1366 | /* |
1367 | * Set default permissions: r-x for all. The disc |
1368 | * could be shared with DOS machines so virtually |
1369 | * anything could be a valid executable. |
1370 | */ |
1371 | inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; |
1372 | } |
1373 | set_nlink(inode, nlink: 1); |
1374 | } |
1375 | inode->i_uid = sbi->s_uid; |
1376 | inode->i_gid = sbi->s_gid; |
1377 | inode->i_blocks = 0; |
1378 | |
1379 | ei->i_format_parm[0] = 0; |
1380 | ei->i_format_parm[1] = 0; |
1381 | ei->i_format_parm[2] = 0; |
1382 | |
1383 | ei->i_section_size = isonum_733(p: de->size); |
1384 | if (de->flags[-high_sierra] & 0x80) { |
1385 | ret = isofs_read_level3_size(inode); |
1386 | if (ret < 0) |
1387 | goto fail; |
1388 | ret = -EIO; |
1389 | } else { |
1390 | ei->i_next_section_block = 0; |
1391 | ei->i_next_section_offset = 0; |
1392 | inode->i_size = isonum_733(p: de->size); |
1393 | } |
1394 | |
1395 | /* |
1396 | * Some dipshit decided to store some other bit of information |
1397 | * in the high byte of the file length. Truncate size in case |
1398 | * this CDROM was mounted with the cruft option. |
1399 | */ |
1400 | |
1401 | if (sbi->s_cruft) |
1402 | inode->i_size &= 0x00ffffff; |
1403 | |
1404 | if (de->interleave[0]) { |
1405 | printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n" ); |
1406 | inode->i_size = 0; |
1407 | } |
1408 | |
1409 | /* I have no idea what file_unit_size is used for, so |
1410 | we will flag it for now */ |
1411 | if (de->file_unit_size[0] != 0) { |
1412 | printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n" , |
1413 | inode->i_ino); |
1414 | } |
1415 | |
1416 | /* I have no idea what other flag bits are used for, so |
1417 | we will flag it for now */ |
1418 | #ifdef DEBUG |
1419 | if((de->flags[-high_sierra] & ~2)!= 0){ |
1420 | printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " |
1421 | "(%ld %x).\n" , |
1422 | inode->i_ino, de->flags[-high_sierra]); |
1423 | } |
1424 | #endif |
1425 | inode_set_mtime_to_ts(inode, |
1426 | ts: inode_set_atime_to_ts(inode, ts: inode_set_ctime(inode, sec: iso_date(de->date, high_sierra), nsec: 0))); |
1427 | |
1428 | ei->i_first_extent = (isonum_733(p: de->extent) + |
1429 | isonum_711(p: de->ext_attr_length)); |
1430 | |
1431 | /* Set the number of blocks for stat() - should be done before RR */ |
1432 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1433 | |
1434 | /* |
1435 | * Now test for possible Rock Ridge extensions which will override |
1436 | * some of these numbers in the inode structure. |
1437 | */ |
1438 | |
1439 | if (!high_sierra) { |
1440 | parse_rock_ridge_inode(de, inode, relocated); |
1441 | /* if we want uid/gid set, override the rock ridge setting */ |
1442 | if (sbi->s_uid_set) |
1443 | inode->i_uid = sbi->s_uid; |
1444 | if (sbi->s_gid_set) |
1445 | inode->i_gid = sbi->s_gid; |
1446 | } |
1447 | /* Now set final access rights if overriding rock ridge setting */ |
1448 | if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && |
1449 | sbi->s_dmode != ISOFS_INVALID_MODE) |
1450 | inode->i_mode = S_IFDIR | sbi->s_dmode; |
1451 | if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && |
1452 | sbi->s_fmode != ISOFS_INVALID_MODE) |
1453 | inode->i_mode = S_IFREG | sbi->s_fmode; |
1454 | |
1455 | /* Install the inode operations vector */ |
1456 | if (S_ISREG(inode->i_mode)) { |
1457 | inode->i_fop = &generic_ro_fops; |
1458 | switch (ei->i_file_format) { |
1459 | #ifdef CONFIG_ZISOFS |
1460 | case isofs_file_compressed: |
1461 | inode->i_data.a_ops = &zisofs_aops; |
1462 | break; |
1463 | #endif |
1464 | default: |
1465 | inode->i_data.a_ops = &isofs_aops; |
1466 | break; |
1467 | } |
1468 | } else if (S_ISDIR(inode->i_mode)) { |
1469 | inode->i_op = &isofs_dir_inode_operations; |
1470 | inode->i_fop = &isofs_dir_operations; |
1471 | } else if (S_ISLNK(inode->i_mode)) { |
1472 | inode->i_op = &page_symlink_inode_operations; |
1473 | inode_nohighmem(inode); |
1474 | inode->i_data.a_ops = &isofs_symlink_aops; |
1475 | } else |
1476 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ |
1477 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
1478 | |
1479 | ret = 0; |
1480 | out: |
1481 | kfree(objp: tmpde); |
1482 | brelse(bh); |
1483 | return ret; |
1484 | |
1485 | out_badread: |
1486 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n" ); |
1487 | fail: |
1488 | goto out; |
1489 | } |
1490 | |
1491 | struct isofs_iget5_callback_data { |
1492 | unsigned long block; |
1493 | unsigned long offset; |
1494 | }; |
1495 | |
1496 | static int isofs_iget5_test(struct inode *ino, void *data) |
1497 | { |
1498 | struct iso_inode_info *i = ISOFS_I(inode: ino); |
1499 | struct isofs_iget5_callback_data *d = |
1500 | (struct isofs_iget5_callback_data*)data; |
1501 | return (i->i_iget5_block == d->block) |
1502 | && (i->i_iget5_offset == d->offset); |
1503 | } |
1504 | |
1505 | static int isofs_iget5_set(struct inode *ino, void *data) |
1506 | { |
1507 | struct iso_inode_info *i = ISOFS_I(inode: ino); |
1508 | struct isofs_iget5_callback_data *d = |
1509 | (struct isofs_iget5_callback_data*)data; |
1510 | i->i_iget5_block = d->block; |
1511 | i->i_iget5_offset = d->offset; |
1512 | return 0; |
1513 | } |
1514 | |
1515 | /* Store, in the inode's containing structure, the block and block |
1516 | * offset that point to the underlying meta-data for the inode. The |
1517 | * code below is otherwise similar to the iget() code in |
1518 | * include/linux/fs.h */ |
1519 | struct inode *__isofs_iget(struct super_block *sb, |
1520 | unsigned long block, |
1521 | unsigned long offset, |
1522 | int relocated) |
1523 | { |
1524 | unsigned long hashval; |
1525 | struct inode *inode; |
1526 | struct isofs_iget5_callback_data data; |
1527 | long ret; |
1528 | |
1529 | if (offset >= 1ul << sb->s_blocksize_bits) |
1530 | return ERR_PTR(error: -EINVAL); |
1531 | |
1532 | data.block = block; |
1533 | data.offset = offset; |
1534 | |
1535 | hashval = (block << sb->s_blocksize_bits) | offset; |
1536 | |
1537 | inode = iget5_locked(sb, hashval, test: &isofs_iget5_test, |
1538 | set: &isofs_iget5_set, &data); |
1539 | |
1540 | if (!inode) |
1541 | return ERR_PTR(error: -ENOMEM); |
1542 | |
1543 | if (inode->i_state & I_NEW) { |
1544 | ret = isofs_read_inode(inode, relocated); |
1545 | if (ret < 0) { |
1546 | iget_failed(inode); |
1547 | inode = ERR_PTR(error: ret); |
1548 | } else { |
1549 | unlock_new_inode(inode); |
1550 | } |
1551 | } |
1552 | |
1553 | return inode; |
1554 | } |
1555 | |
1556 | static struct dentry *isofs_mount(struct file_system_type *fs_type, |
1557 | int flags, const char *dev_name, void *data) |
1558 | { |
1559 | return mount_bdev(fs_type, flags, dev_name, data, fill_super: isofs_fill_super); |
1560 | } |
1561 | |
1562 | static struct file_system_type iso9660_fs_type = { |
1563 | .owner = THIS_MODULE, |
1564 | .name = "iso9660" , |
1565 | .mount = isofs_mount, |
1566 | .kill_sb = kill_block_super, |
1567 | .fs_flags = FS_REQUIRES_DEV, |
1568 | }; |
1569 | MODULE_ALIAS_FS("iso9660" ); |
1570 | MODULE_ALIAS("iso9660" ); |
1571 | |
1572 | static int __init init_iso9660_fs(void) |
1573 | { |
1574 | int err = init_inodecache(); |
1575 | if (err) |
1576 | goto out; |
1577 | #ifdef CONFIG_ZISOFS |
1578 | err = zisofs_init(); |
1579 | if (err) |
1580 | goto out1; |
1581 | #endif |
1582 | err = register_filesystem(&iso9660_fs_type); |
1583 | if (err) |
1584 | goto out2; |
1585 | return 0; |
1586 | out2: |
1587 | #ifdef CONFIG_ZISOFS |
1588 | zisofs_cleanup(); |
1589 | out1: |
1590 | #endif |
1591 | destroy_inodecache(); |
1592 | out: |
1593 | return err; |
1594 | } |
1595 | |
1596 | static void __exit exit_iso9660_fs(void) |
1597 | { |
1598 | unregister_filesystem(&iso9660_fs_type); |
1599 | #ifdef CONFIG_ZISOFS |
1600 | zisofs_cleanup(); |
1601 | #endif |
1602 | destroy_inodecache(); |
1603 | } |
1604 | |
1605 | module_init(init_iso9660_fs) |
1606 | module_exit(exit_iso9660_fs) |
1607 | MODULE_LICENSE("GPL" ); |
1608 | |