Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/isofs/inode.c | |
3 | * | |
4 | * (C) 1991 Linus Torvalds - minix filesystem | |
5 | * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. | |
96de0e25 | 6 | * 1994 Eberhard Mönkeberg - multi session handling. |
1da177e4 LT |
7 | * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. |
8 | * 1997 Gordon Chaffee - Joliet CDs | |
9 | * 1998 Eric Lammerts - ISO 9660 Level 3 | |
10 | * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB | |
11 | * 2004 Paul Serice - NFS Export Operations | |
12 | */ | |
13 | ||
94f2f715 | 14 | #include <linux/init.h> |
1da177e4 LT |
15 | #include <linux/module.h> |
16 | ||
1da177e4 | 17 | #include <linux/slab.h> |
1da177e4 LT |
18 | #include <linux/nls.h> |
19 | #include <linux/ctype.h> | |
20 | #include <linux/smp_lock.h> | |
94f2f715 AV |
21 | #include <linux/statfs.h> |
22 | #include <linux/cdrom.h> | |
1da177e4 | 23 | #include <linux/parser.h> |
1da177e4 | 24 | |
94f2f715 | 25 | #include "isofs.h" |
1da177e4 LT |
26 | #include "zisofs.h" |
27 | ||
28 | #define BEQUIET | |
29 | ||
1da177e4 LT |
30 | static int isofs_hashi(struct dentry *parent, struct qstr *qstr); |
31 | static int isofs_hash(struct dentry *parent, struct qstr *qstr); | |
32 | static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b); | |
33 | static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b); | |
34 | ||
35 | #ifdef CONFIG_JOLIET | |
36 | static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr); | |
37 | static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr); | |
38 | static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b); | |
39 | static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b); | |
40 | #endif | |
41 | ||
42 | static void isofs_put_super(struct super_block *sb) | |
43 | { | |
44 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
6cfd0148 | 45 | |
1da177e4 | 46 | #ifdef CONFIG_JOLIET |
6cfd0148 CH |
47 | lock_kernel(); |
48 | ||
1da177e4 LT |
49 | if (sbi->s_nls_iocharset) { |
50 | unload_nls(sbi->s_nls_iocharset); | |
51 | sbi->s_nls_iocharset = NULL; | |
52 | } | |
6cfd0148 CH |
53 | |
54 | unlock_kernel(); | |
1da177e4 LT |
55 | #endif |
56 | ||
1da177e4 LT |
57 | kfree(sbi); |
58 | sb->s_fs_info = NULL; | |
59 | return; | |
60 | } | |
61 | ||
c4386c83 | 62 | static int isofs_read_inode(struct inode *); |
726c3342 | 63 | static int isofs_statfs (struct dentry *, struct kstatfs *); |
1da177e4 | 64 | |
e18b890b | 65 | static struct kmem_cache *isofs_inode_cachep; |
1da177e4 LT |
66 | |
67 | static struct inode *isofs_alloc_inode(struct super_block *sb) | |
68 | { | |
69 | struct iso_inode_info *ei; | |
e94b1766 | 70 | ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
71 | if (!ei) |
72 | return NULL; | |
73 | return &ei->vfs_inode; | |
74 | } | |
75 | ||
76 | static void isofs_destroy_inode(struct inode *inode) | |
77 | { | |
78 | kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); | |
79 | } | |
80 | ||
51cc5068 | 81 | static void init_once(void *foo) |
1da177e4 | 82 | { |
9eb7f2c6 | 83 | struct iso_inode_info *ei = foo; |
1da177e4 | 84 | |
a35afb83 | 85 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 86 | } |
c3ed85a3 | 87 | |
1da177e4 LT |
88 | static int init_inodecache(void) |
89 | { | |
90 | isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", | |
c3ed85a3 DJ |
91 | sizeof(struct iso_inode_info), |
92 | 0, (SLAB_RECLAIM_ACCOUNT| | |
93 | SLAB_MEM_SPREAD), | |
20c2df83 | 94 | init_once); |
1da177e4 LT |
95 | if (isofs_inode_cachep == NULL) |
96 | return -ENOMEM; | |
97 | return 0; | |
98 | } | |
99 | ||
100 | static void destroy_inodecache(void) | |
101 | { | |
1a1d92c1 | 102 | kmem_cache_destroy(isofs_inode_cachep); |
1da177e4 LT |
103 | } |
104 | ||
105 | static int isofs_remount(struct super_block *sb, int *flags, char *data) | |
106 | { | |
107 | /* we probably want a lot more here */ | |
108 | *flags |= MS_RDONLY; | |
109 | return 0; | |
110 | } | |
111 | ||
ee9b6d61 | 112 | static const struct super_operations isofs_sops = { |
1da177e4 LT |
113 | .alloc_inode = isofs_alloc_inode, |
114 | .destroy_inode = isofs_destroy_inode, | |
1da177e4 LT |
115 | .put_super = isofs_put_super, |
116 | .statfs = isofs_statfs, | |
117 | .remount_fs = isofs_remount, | |
d0132eea | 118 | .show_options = generic_show_options, |
1da177e4 LT |
119 | }; |
120 | ||
121 | ||
e16404ed | 122 | static const struct dentry_operations isofs_dentry_ops[] = { |
1da177e4 LT |
123 | { |
124 | .d_hash = isofs_hash, | |
125 | .d_compare = isofs_dentry_cmp, | |
126 | }, | |
127 | { | |
128 | .d_hash = isofs_hashi, | |
129 | .d_compare = isofs_dentry_cmpi, | |
130 | }, | |
131 | #ifdef CONFIG_JOLIET | |
132 | { | |
133 | .d_hash = isofs_hash_ms, | |
134 | .d_compare = isofs_dentry_cmp_ms, | |
135 | }, | |
136 | { | |
137 | .d_hash = isofs_hashi_ms, | |
138 | .d_compare = isofs_dentry_cmpi_ms, | |
9eb7f2c6 | 139 | }, |
1da177e4 LT |
140 | #endif |
141 | }; | |
142 | ||
143 | struct iso9660_options{ | |
5404ac8e | 144 | unsigned int rock:1; |
8711c67b | 145 | unsigned int joliet:1; |
5404ac8e JK |
146 | unsigned int cruft:1; |
147 | unsigned int hide:1; | |
148 | unsigned int showassoc:1; | |
149 | unsigned int nocompress:1; | |
150 | unsigned int overriderockperm:1; | |
151 | unsigned int uid_set:1; | |
152 | unsigned int gid_set:1; | |
153 | unsigned int utf8:1; | |
154 | unsigned char map; | |
1da177e4 LT |
155 | unsigned char check; |
156 | unsigned int blocksize; | |
9b7880e7 JK |
157 | mode_t fmode; |
158 | mode_t dmode; | |
1da177e4 LT |
159 | gid_t gid; |
160 | uid_t uid; | |
161 | char *iocharset; | |
c3ed85a3 DJ |
162 | /* LVE */ |
163 | s32 session; | |
164 | s32 sbsector; | |
1da177e4 LT |
165 | }; |
166 | ||
167 | /* | |
168 | * Compute the hash for the isofs name corresponding to the dentry. | |
169 | */ | |
170 | static int | |
171 | isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms) | |
172 | { | |
173 | const char *name; | |
174 | int len; | |
175 | ||
176 | len = qstr->len; | |
177 | name = qstr->name; | |
178 | if (ms) { | |
179 | while (len && name[len-1] == '.') | |
180 | len--; | |
181 | } | |
182 | ||
183 | qstr->hash = full_name_hash(name, len); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Compute the hash for the isofs name corresponding to the dentry. | |
190 | */ | |
191 | static int | |
192 | isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms) | |
193 | { | |
194 | const char *name; | |
195 | int len; | |
196 | char c; | |
197 | unsigned long hash; | |
198 | ||
199 | len = qstr->len; | |
200 | name = qstr->name; | |
201 | if (ms) { | |
202 | while (len && name[len-1] == '.') | |
203 | len--; | |
204 | } | |
205 | ||
206 | hash = init_name_hash(); | |
207 | while (len--) { | |
208 | c = tolower(*name++); | |
f17e121f | 209 | hash = partial_name_hash(c, hash); |
1da177e4 LT |
210 | } |
211 | qstr->hash = end_name_hash(hash); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Case insensitive compare of two isofs names. | |
218 | */ | |
9eb7f2c6 AM |
219 | static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a, |
220 | struct qstr *b, int ms) | |
1da177e4 LT |
221 | { |
222 | int alen, blen; | |
223 | ||
224 | /* A filename cannot end in '.' or we treat it like it has none */ | |
225 | alen = a->len; | |
226 | blen = b->len; | |
227 | if (ms) { | |
228 | while (alen && a->name[alen-1] == '.') | |
229 | alen--; | |
230 | while (blen && b->name[blen-1] == '.') | |
231 | blen--; | |
232 | } | |
233 | if (alen == blen) { | |
234 | if (strnicmp(a->name, b->name, alen) == 0) | |
235 | return 0; | |
236 | } | |
237 | return 1; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Case sensitive compare of two isofs names. | |
242 | */ | |
9eb7f2c6 AM |
243 | static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a, |
244 | struct qstr *b, int ms) | |
1da177e4 LT |
245 | { |
246 | int alen, blen; | |
247 | ||
248 | /* A filename cannot end in '.' or we treat it like it has none */ | |
249 | alen = a->len; | |
250 | blen = b->len; | |
251 | if (ms) { | |
252 | while (alen && a->name[alen-1] == '.') | |
253 | alen--; | |
254 | while (blen && b->name[blen-1] == '.') | |
255 | blen--; | |
256 | } | |
257 | if (alen == blen) { | |
258 | if (strncmp(a->name, b->name, alen) == 0) | |
259 | return 0; | |
260 | } | |
261 | return 1; | |
262 | } | |
263 | ||
264 | static int | |
265 | isofs_hash(struct dentry *dentry, struct qstr *qstr) | |
266 | { | |
267 | return isofs_hash_common(dentry, qstr, 0); | |
268 | } | |
269 | ||
270 | static int | |
271 | isofs_hashi(struct dentry *dentry, struct qstr *qstr) | |
272 | { | |
273 | return isofs_hashi_common(dentry, qstr, 0); | |
274 | } | |
275 | ||
276 | static int | |
277 | isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
278 | { | |
279 | return isofs_dentry_cmp_common(dentry, a, b, 0); | |
280 | } | |
281 | ||
282 | static int | |
283 | isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
284 | { | |
285 | return isofs_dentry_cmpi_common(dentry, a, b, 0); | |
286 | } | |
287 | ||
288 | #ifdef CONFIG_JOLIET | |
289 | static int | |
290 | isofs_hash_ms(struct dentry *dentry, struct qstr *qstr) | |
291 | { | |
292 | return isofs_hash_common(dentry, qstr, 1); | |
293 | } | |
294 | ||
295 | static int | |
296 | isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr) | |
297 | { | |
298 | return isofs_hashi_common(dentry, qstr, 1); | |
299 | } | |
300 | ||
301 | static int | |
302 | isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
303 | { | |
304 | return isofs_dentry_cmp_common(dentry, a, b, 1); | |
305 | } | |
306 | ||
307 | static int | |
308 | isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
309 | { | |
310 | return isofs_dentry_cmpi_common(dentry, a, b, 1); | |
311 | } | |
312 | #endif | |
313 | ||
314 | enum { | |
315 | Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, | |
316 | Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, | |
317 | Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, | |
52b680c8 | 318 | Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm, |
1da177e4 LT |
319 | }; |
320 | ||
a447c093 | 321 | static const match_table_t tokens = { |
1da177e4 LT |
322 | {Opt_norock, "norock"}, |
323 | {Opt_nojoliet, "nojoliet"}, | |
324 | {Opt_unhide, "unhide"}, | |
9769f4eb JW |
325 | {Opt_hide, "hide"}, |
326 | {Opt_showassoc, "showassoc"}, | |
1da177e4 LT |
327 | {Opt_cruft, "cruft"}, |
328 | {Opt_utf8, "utf8"}, | |
329 | {Opt_iocharset, "iocharset=%s"}, | |
330 | {Opt_map_a, "map=acorn"}, | |
331 | {Opt_map_a, "map=a"}, | |
332 | {Opt_map_n, "map=normal"}, | |
333 | {Opt_map_n, "map=n"}, | |
334 | {Opt_map_o, "map=off"}, | |
335 | {Opt_map_o, "map=o"}, | |
336 | {Opt_session, "session=%u"}, | |
337 | {Opt_sb, "sbsector=%u"}, | |
338 | {Opt_check_r, "check=relaxed"}, | |
339 | {Opt_check_r, "check=r"}, | |
340 | {Opt_check_s, "check=strict"}, | |
341 | {Opt_check_s, "check=s"}, | |
342 | {Opt_uid, "uid=%u"}, | |
343 | {Opt_gid, "gid=%u"}, | |
344 | {Opt_mode, "mode=%u"}, | |
9b7880e7 | 345 | {Opt_dmode, "dmode=%u"}, |
52b680c8 | 346 | {Opt_overriderockperm, "overriderockperm"}, |
1da177e4 LT |
347 | {Opt_block, "block=%u"}, |
348 | {Opt_ignore, "conv=binary"}, | |
349 | {Opt_ignore, "conv=b"}, | |
350 | {Opt_ignore, "conv=text"}, | |
351 | {Opt_ignore, "conv=t"}, | |
352 | {Opt_ignore, "conv=mtext"}, | |
353 | {Opt_ignore, "conv=m"}, | |
354 | {Opt_ignore, "conv=auto"}, | |
355 | {Opt_ignore, "conv=a"}, | |
356 | {Opt_nocompress, "nocompress"}, | |
357 | {Opt_err, NULL} | |
358 | }; | |
359 | ||
9eb7f2c6 | 360 | static int parse_options(char *options, struct iso9660_options *popt) |
1da177e4 LT |
361 | { |
362 | char *p; | |
363 | int option; | |
364 | ||
365 | popt->map = 'n'; | |
5404ac8e JK |
366 | popt->rock = 1; |
367 | popt->joliet = 1; | |
368 | popt->cruft = 0; | |
369 | popt->hide = 0; | |
370 | popt->showassoc = 0; | |
1da177e4 LT |
371 | popt->check = 'u'; /* unset */ |
372 | popt->nocompress = 0; | |
373 | popt->blocksize = 1024; | |
52b680c8 | 374 | popt->fmode = popt->dmode = ISOFS_INVALID_MODE; |
5c4a656b JK |
375 | popt->uid_set = 0; |
376 | popt->gid_set = 0; | |
1da177e4 LT |
377 | popt->gid = 0; |
378 | popt->uid = 0; | |
379 | popt->iocharset = NULL; | |
380 | popt->utf8 = 0; | |
52b680c8 | 381 | popt->overriderockperm = 0; |
1da177e4 LT |
382 | popt->session=-1; |
383 | popt->sbsector=-1; | |
384 | if (!options) | |
385 | return 1; | |
386 | ||
387 | while ((p = strsep(&options, ",")) != NULL) { | |
388 | int token; | |
389 | substring_t args[MAX_OPT_ARGS]; | |
390 | unsigned n; | |
391 | ||
392 | if (!*p) | |
393 | continue; | |
394 | ||
395 | token = match_token(p, tokens, args); | |
396 | switch (token) { | |
397 | case Opt_norock: | |
5404ac8e | 398 | popt->rock = 0; |
1da177e4 LT |
399 | break; |
400 | case Opt_nojoliet: | |
5404ac8e | 401 | popt->joliet = 0; |
1da177e4 | 402 | break; |
9769f4eb | 403 | case Opt_hide: |
5404ac8e | 404 | popt->hide = 1; |
9769f4eb | 405 | break; |
1da177e4 | 406 | case Opt_unhide: |
9769f4eb | 407 | case Opt_showassoc: |
5404ac8e | 408 | popt->showassoc = 1; |
1da177e4 LT |
409 | break; |
410 | case Opt_cruft: | |
5404ac8e | 411 | popt->cruft = 1; |
1da177e4 LT |
412 | break; |
413 | case Opt_utf8: | |
414 | popt->utf8 = 1; | |
415 | break; | |
416 | #ifdef CONFIG_JOLIET | |
417 | case Opt_iocharset: | |
418 | popt->iocharset = match_strdup(&args[0]); | |
419 | break; | |
420 | #endif | |
421 | case Opt_map_a: | |
422 | popt->map = 'a'; | |
423 | break; | |
424 | case Opt_map_o: | |
425 | popt->map = 'o'; | |
426 | break; | |
427 | case Opt_map_n: | |
428 | popt->map = 'n'; | |
429 | break; | |
430 | case Opt_session: | |
431 | if (match_int(&args[0], &option)) | |
432 | return 0; | |
433 | n = option; | |
434 | if (n > 99) | |
435 | return 0; | |
436 | popt->session = n + 1; | |
437 | break; | |
438 | case Opt_sb: | |
439 | if (match_int(&args[0], &option)) | |
440 | return 0; | |
441 | popt->sbsector = option; | |
442 | break; | |
443 | case Opt_check_r: | |
444 | popt->check = 'r'; | |
445 | break; | |
446 | case Opt_check_s: | |
447 | popt->check = 's'; | |
448 | break; | |
449 | case Opt_ignore: | |
450 | break; | |
451 | case Opt_uid: | |
452 | if (match_int(&args[0], &option)) | |
453 | return 0; | |
454 | popt->uid = option; | |
5c4a656b | 455 | popt->uid_set = 1; |
1da177e4 LT |
456 | break; |
457 | case Opt_gid: | |
458 | if (match_int(&args[0], &option)) | |
459 | return 0; | |
460 | popt->gid = option; | |
5c4a656b | 461 | popt->gid_set = 1; |
1da177e4 LT |
462 | break; |
463 | case Opt_mode: | |
464 | if (match_int(&args[0], &option)) | |
465 | return 0; | |
9b7880e7 JK |
466 | popt->fmode = option; |
467 | break; | |
468 | case Opt_dmode: | |
469 | if (match_int(&args[0], &option)) | |
470 | return 0; | |
471 | popt->dmode = option; | |
1da177e4 | 472 | break; |
52b680c8 JK |
473 | case Opt_overriderockperm: |
474 | popt->overriderockperm = 1; | |
475 | break; | |
1da177e4 LT |
476 | case Opt_block: |
477 | if (match_int(&args[0], &option)) | |
478 | return 0; | |
479 | n = option; | |
480 | if (n != 512 && n != 1024 && n != 2048) | |
481 | return 0; | |
482 | popt->blocksize = n; | |
483 | break; | |
484 | case Opt_nocompress: | |
485 | popt->nocompress = 1; | |
486 | break; | |
487 | default: | |
488 | return 0; | |
489 | } | |
490 | } | |
491 | return 1; | |
492 | } | |
493 | ||
494 | /* | |
495 | * look if the driver can tell the multi session redirection value | |
496 | * | |
497 | * don't change this if you don't know what you do, please! | |
498 | * Multisession is legal only with XA disks. | |
499 | * A non-XA disk with more than one volume descriptor may do it right, but | |
500 | * usually is written in a nowhere standardized "multi-partition" manner. | |
501 | * Multisession uses absolute addressing (solely the first frame of the whole | |
502 | * track is #0), multi-partition uses relative addressing (each first frame of | |
503 | * each track is #0), and a track is not a session. | |
504 | * | |
505 | * A broken CDwriter software or drive firmware does not set new standards, | |
506 | * at least not if conflicting with the existing ones. | |
507 | * | |
508 | * emoenke@gwdg.de | |
509 | */ | |
510 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
511 | ||
9eb7f2c6 | 512 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
1da177e4 LT |
513 | { |
514 | struct cdrom_multisession ms_info; | |
515 | unsigned int vol_desc_start; | |
516 | struct block_device *bdev = sb->s_bdev; | |
517 | int i; | |
518 | ||
519 | vol_desc_start=0; | |
520 | ms_info.addr_format=CDROM_LBA; | |
521 | if(session >= 0 && session <= 99) { | |
522 | struct cdrom_tocentry Te; | |
523 | Te.cdte_track=session; | |
524 | Te.cdte_format=CDROM_LBA; | |
525 | i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); | |
526 | if (!i) { | |
c3ed85a3 DJ |
527 | printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n", |
528 | session, Te.cdte_addr.lba, | |
529 | Te.cdte_ctrl&CDROM_DATA_TRACK); | |
1da177e4 LT |
530 | if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) |
531 | return Te.cdte_addr.lba; | |
532 | } | |
c3ed85a3 DJ |
533 | |
534 | printk(KERN_ERR "ISOFS: Invalid session number or type of track\n"); | |
1da177e4 LT |
535 | } |
536 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); | |
9eb7f2c6 | 537 | if (session > 0) |
c3ed85a3 | 538 | printk(KERN_ERR "ISOFS: Invalid session number\n"); |
1da177e4 | 539 | #if 0 |
c3ed85a3 | 540 | printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i); |
1da177e4 | 541 | if (i==0) { |
c3ed85a3 DJ |
542 | printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); |
543 | printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); | |
1da177e4 LT |
544 | } |
545 | #endif | |
546 | if (i==0) | |
547 | #if WE_OBEY_THE_WRITTEN_STANDARDS | |
c3ed85a3 | 548 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ |
1da177e4 | 549 | #endif |
c3ed85a3 | 550 | vol_desc_start=ms_info.addr.lba; |
1da177e4 LT |
551 | return vol_desc_start; |
552 | } | |
553 | ||
554 | /* | |
555 | * Initialize the superblock and read the root inode. | |
556 | * | |
557 | * Note: a check_disk_change() has been done immediately prior | |
558 | * to this call, so we don't need to check again. | |
559 | */ | |
560 | static int isofs_fill_super(struct super_block *s, void *data, int silent) | |
561 | { | |
c3ed85a3 DJ |
562 | struct buffer_head *bh = NULL, *pri_bh = NULL; |
563 | struct hs_primary_descriptor *h_pri = NULL; | |
564 | struct iso_primary_descriptor *pri = NULL; | |
1da177e4 | 565 | struct iso_supplementary_descriptor *sec = NULL; |
c3ed85a3 DJ |
566 | struct iso_directory_record *rootp; |
567 | struct inode *inode; | |
568 | struct iso9660_options opt; | |
569 | struct isofs_sb_info *sbi; | |
570 | unsigned long first_data_zone; | |
571 | int joliet_level = 0; | |
572 | int iso_blknum, block; | |
573 | int orig_zonesize; | |
c4386c83 | 574 | int table, error = -EINVAL; |
c3ed85a3 | 575 | unsigned int vol_desc_start; |
1da177e4 | 576 | |
d0132eea MS |
577 | save_mount_options(s, data); |
578 | ||
f8314dc6 | 579 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 LT |
580 | if (!sbi) |
581 | return -ENOMEM; | |
582 | s->s_fs_info = sbi; | |
1da177e4 | 583 | |
9eb7f2c6 | 584 | if (!parse_options((char *)data, &opt)) |
1da177e4 LT |
585 | goto out_freesbi; |
586 | ||
587 | /* | |
588 | * First of all, get the hardware blocksize for this device. | |
589 | * If we don't know what it is, or the hardware blocksize is | |
590 | * larger than the blocksize the user specified, then use | |
591 | * that value. | |
592 | */ | |
593 | /* | |
594 | * What if bugger tells us to go beyond page size? | |
595 | */ | |
596 | opt.blocksize = sb_min_blocksize(s, opt.blocksize); | |
597 | ||
598 | sbi->s_high_sierra = 0; /* default is iso9660 */ | |
599 | ||
600 | vol_desc_start = (opt.sbsector != -1) ? | |
601 | opt.sbsector : isofs_get_last_session(s,opt.session); | |
602 | ||
c3ed85a3 DJ |
603 | for (iso_blknum = vol_desc_start+16; |
604 | iso_blknum < vol_desc_start+100; iso_blknum++) { | |
605 | struct hs_volume_descriptor *hdp; | |
606 | struct iso_volume_descriptor *vdp; | |
607 | ||
608 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); | |
609 | if (!(bh = sb_bread(s, block))) | |
610 | goto out_no_read; | |
611 | ||
612 | vdp = (struct iso_volume_descriptor *)bh->b_data; | |
613 | hdp = (struct hs_volume_descriptor *)bh->b_data; | |
614 | ||
615 | /* | |
616 | * Due to the overlapping physical location of the descriptors, | |
617 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure | |
618 | * proper identification in this case, we first check for ISO. | |
619 | */ | |
620 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { | |
621 | if (isonum_711(vdp->type) == ISO_VD_END) | |
622 | break; | |
623 | if (isonum_711(vdp->type) == ISO_VD_PRIMARY) { | |
624 | if (pri == NULL) { | |
625 | pri = (struct iso_primary_descriptor *)vdp; | |
626 | /* Save the buffer in case we need it ... */ | |
627 | pri_bh = bh; | |
628 | bh = NULL; | |
629 | } | |
630 | } | |
1da177e4 | 631 | #ifdef CONFIG_JOLIET |
c3ed85a3 DJ |
632 | else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) { |
633 | sec = (struct iso_supplementary_descriptor *)vdp; | |
634 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { | |
8711c67b | 635 | if (opt.joliet) { |
c3ed85a3 DJ |
636 | if (sec->escape[2] == 0x40) |
637 | joliet_level = 1; | |
638 | else if (sec->escape[2] == 0x43) | |
639 | joliet_level = 2; | |
640 | else if (sec->escape[2] == 0x45) | |
641 | joliet_level = 3; | |
642 | ||
643 | printk(KERN_DEBUG "ISO 9660 Extensions: " | |
644 | "Microsoft Joliet Level %d\n", | |
645 | joliet_level); | |
646 | } | |
647 | goto root_found; | |
648 | } else { | |
649 | /* Unknown supplementary volume descriptor */ | |
650 | sec = NULL; | |
651 | } | |
1da177e4 | 652 | } |
1da177e4 | 653 | #endif |
c3ed85a3 DJ |
654 | } else { |
655 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { | |
656 | if (isonum_711(hdp->type) != ISO_VD_PRIMARY) | |
657 | goto out_freebh; | |
658 | ||
659 | sbi->s_high_sierra = 1; | |
5404ac8e | 660 | opt.rock = 0; |
c3ed85a3 DJ |
661 | h_pri = (struct hs_primary_descriptor *)vdp; |
662 | goto root_found; | |
663 | } | |
1da177e4 | 664 | } |
1da177e4 | 665 | |
c3ed85a3 | 666 | /* Just skip any volume descriptors we don't recognize */ |
1da177e4 | 667 | |
c3ed85a3 DJ |
668 | brelse(bh); |
669 | bh = NULL; | |
1da177e4 LT |
670 | } |
671 | /* | |
672 | * If we fall through, either no volume descriptor was found, | |
673 | * or else we passed a primary descriptor looking for others. | |
674 | */ | |
675 | if (!pri) | |
676 | goto out_unknown_format; | |
677 | brelse(bh); | |
678 | bh = pri_bh; | |
679 | pri_bh = NULL; | |
680 | ||
681 | root_found: | |
682 | ||
5404ac8e | 683 | if (joliet_level && (pri == NULL || !opt.rock)) { |
c3ed85a3 DJ |
684 | /* This is the case of Joliet with the norock mount flag. |
685 | * A disc with both Joliet and Rock Ridge is handled later | |
686 | */ | |
687 | pri = (struct iso_primary_descriptor *) sec; | |
1da177e4 LT |
688 | } |
689 | ||
690 | if(sbi->s_high_sierra){ | |
c3ed85a3 DJ |
691 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; |
692 | sbi->s_nzones = isonum_733(h_pri->volume_space_size); | |
693 | sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size); | |
694 | sbi->s_max_size = isonum_733(h_pri->volume_space_size); | |
1da177e4 | 695 | } else { |
c3ed85a3 DJ |
696 | if (!pri) |
697 | goto out_freebh; | |
698 | rootp = (struct iso_directory_record *) pri->root_directory_record; | |
699 | sbi->s_nzones = isonum_733(pri->volume_space_size); | |
700 | sbi->s_log_zone_size = isonum_723(pri->logical_block_size); | |
701 | sbi->s_max_size = isonum_733(pri->volume_space_size); | |
1da177e4 LT |
702 | } |
703 | ||
704 | sbi->s_ninodes = 0; /* No way to figure this out easily */ | |
705 | ||
706 | orig_zonesize = sbi->s_log_zone_size; | |
707 | /* | |
708 | * If the zone size is smaller than the hardware sector size, | |
709 | * this is a fatal error. This would occur if the disc drive | |
710 | * had sectors that were 2048 bytes, but the filesystem had | |
711 | * blocks that were 512 bytes (which should only very rarely | |
712 | * happen.) | |
713 | */ | |
c3ed85a3 | 714 | if (orig_zonesize < opt.blocksize) |
1da177e4 LT |
715 | goto out_bad_size; |
716 | ||
717 | /* RDE: convert log zone size to bit shift */ | |
c3ed85a3 DJ |
718 | switch (sbi->s_log_zone_size) { |
719 | case 512: sbi->s_log_zone_size = 9; break; | |
720 | case 1024: sbi->s_log_zone_size = 10; break; | |
721 | case 2048: sbi->s_log_zone_size = 11; break; | |
1da177e4 | 722 | |
c3ed85a3 | 723 | default: |
1da177e4 | 724 | goto out_bad_zone_size; |
c3ed85a3 | 725 | } |
1da177e4 LT |
726 | |
727 | s->s_magic = ISOFS_SUPER_MAGIC; | |
728 | s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */ | |
729 | ||
c3ed85a3 DJ |
730 | /* |
731 | * The CDROM is read-only, has no nodes (devices) on it, and since | |
732 | * all of the files appear to be owned by root, we really do not want | |
733 | * to allow suid. (suid or devices will not show up unless we have | |
734 | * Rock Ridge extensions) | |
735 | */ | |
1da177e4 LT |
736 | |
737 | s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; | |
738 | ||
739 | /* Set this for reference. Its not currently used except on write | |
740 | which we don't have .. */ | |
c3ed85a3 DJ |
741 | |
742 | first_data_zone = isonum_733(rootp->extent) + | |
743 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
744 | sbi->s_firstdatazone = first_data_zone; |
745 | #ifndef BEQUIET | |
c3ed85a3 DJ |
746 | printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n", |
747 | sbi->s_max_size, 1UL << sbi->s_log_zone_size); | |
748 | printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone); | |
1da177e4 | 749 | if(sbi->s_high_sierra) |
c3ed85a3 | 750 | printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n"); |
1da177e4 LT |
751 | #endif |
752 | ||
753 | /* | |
754 | * If the Joliet level is set, we _may_ decide to use the | |
755 | * secondary descriptor, but can't be sure until after we | |
756 | * read the root inode. But before reading the root inode | |
757 | * we may need to change the device blocksize, and would | |
758 | * rather release the old buffer first. So, we cache the | |
759 | * first_data_zone value from the secondary descriptor. | |
760 | */ | |
761 | if (joliet_level) { | |
762 | pri = (struct iso_primary_descriptor *) sec; | |
763 | rootp = (struct iso_directory_record *) | |
764 | pri->root_directory_record; | |
c3ed85a3 DJ |
765 | first_data_zone = isonum_733(rootp->extent) + |
766 | isonum_711(rootp->ext_attr_length); | |
1da177e4 LT |
767 | } |
768 | ||
769 | /* | |
770 | * We're all done using the volume descriptor, and may need | |
771 | * to change the device blocksize, so release the buffer now. | |
772 | */ | |
773 | brelse(pri_bh); | |
774 | brelse(bh); | |
775 | ||
776 | /* | |
777 | * Force the blocksize to 512 for 512 byte sectors. The file | |
778 | * read primitives really get it wrong in a bad way if we don't | |
779 | * do this. | |
780 | * | |
781 | * Note - we should never be setting the blocksize to something | |
782 | * less than the hardware sector size for the device. If we | |
783 | * do, we would end up having to read larger buffers and split | |
784 | * out portions to satisfy requests. | |
785 | * | |
786 | * Note2- the idea here is that we want to deal with the optimal | |
787 | * zonesize in the filesystem. If we have it set to something less, | |
788 | * then we have horrible problems with trying to piece together | |
789 | * bits of adjacent blocks in order to properly read directory | |
790 | * entries. By forcing the blocksize in this way, we ensure | |
791 | * that we will never be required to do this. | |
792 | */ | |
793 | sb_set_blocksize(s, orig_zonesize); | |
794 | ||
795 | sbi->s_nls_iocharset = NULL; | |
796 | ||
797 | #ifdef CONFIG_JOLIET | |
798 | if (joliet_level && opt.utf8 == 0) { | |
c3ed85a3 | 799 | char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; |
1da177e4 LT |
800 | sbi->s_nls_iocharset = load_nls(p); |
801 | if (! sbi->s_nls_iocharset) { | |
802 | /* Fail only if explicit charset specified */ | |
803 | if (opt.iocharset) | |
804 | goto out_freesbi; | |
805 | sbi->s_nls_iocharset = load_nls_default(); | |
806 | } | |
807 | } | |
808 | #endif | |
809 | s->s_op = &isofs_sops; | |
810 | s->s_export_op = &isofs_export_ops; | |
811 | sbi->s_mapping = opt.map; | |
5404ac8e | 812 | sbi->s_rock = (opt.rock ? 2 : 0); |
1da177e4 LT |
813 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ |
814 | sbi->s_cruft = opt.cruft; | |
9769f4eb JW |
815 | sbi->s_hide = opt.hide; |
816 | sbi->s_showassoc = opt.showassoc; | |
1da177e4 LT |
817 | sbi->s_uid = opt.uid; |
818 | sbi->s_gid = opt.gid; | |
5c4a656b JK |
819 | sbi->s_uid_set = opt.uid_set; |
820 | sbi->s_gid_set = opt.gid_set; | |
1da177e4 LT |
821 | sbi->s_utf8 = opt.utf8; |
822 | sbi->s_nocompress = opt.nocompress; | |
52b680c8 | 823 | sbi->s_overriderockperm = opt.overriderockperm; |
1da177e4 LT |
824 | /* |
825 | * It would be incredibly stupid to allow people to mark every file | |
826 | * on the disk as suid, so we merely allow them to set the default | |
827 | * permissions. | |
828 | */ | |
52b680c8 JK |
829 | if (opt.fmode != ISOFS_INVALID_MODE) |
830 | sbi->s_fmode = opt.fmode & 0777; | |
831 | else | |
832 | sbi->s_fmode = ISOFS_INVALID_MODE; | |
833 | if (opt.dmode != ISOFS_INVALID_MODE) | |
834 | sbi->s_dmode = opt.dmode & 0777; | |
835 | else | |
836 | sbi->s_dmode = ISOFS_INVALID_MODE; | |
1da177e4 LT |
837 | |
838 | /* | |
839 | * Read the root inode, which _may_ result in changing | |
840 | * the s_rock flag. Once we have the final s_rock value, | |
841 | * we then decide whether to use the Joliet descriptor. | |
842 | */ | |
843 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
844 | if (IS_ERR(inode)) |
845 | goto out_no_root; | |
1da177e4 LT |
846 | |
847 | /* | |
848 | * If this disk has both Rock Ridge and Joliet on it, then we | |
849 | * want to use Rock Ridge by default. This can be overridden | |
850 | * by using the norock mount option. There is still one other | |
851 | * possibility that is not taken into account: a Rock Ridge | |
852 | * CD with Unicode names. Until someone sees such a beast, it | |
853 | * will not be supported. | |
854 | */ | |
855 | if (sbi->s_rock == 1) { | |
856 | joliet_level = 0; | |
857 | } else if (joliet_level) { | |
858 | sbi->s_rock = 0; | |
859 | if (sbi->s_firstdatazone != first_data_zone) { | |
860 | sbi->s_firstdatazone = first_data_zone; | |
c3ed85a3 | 861 | printk(KERN_DEBUG |
1da177e4 LT |
862 | "ISOFS: changing to secondary root\n"); |
863 | iput(inode); | |
864 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
c4386c83 DH |
865 | if (IS_ERR(inode)) |
866 | goto out_no_root; | |
1da177e4 LT |
867 | } |
868 | } | |
869 | ||
870 | if (opt.check == 'u') { | |
871 | /* Only Joliet is case insensitive by default */ | |
c3ed85a3 DJ |
872 | if (joliet_level) |
873 | opt.check = 'r'; | |
874 | else | |
875 | opt.check = 's'; | |
1da177e4 LT |
876 | } |
877 | sbi->s_joliet_level = joliet_level; | |
878 | ||
817794e0 KK |
879 | /* Make sure the root inode is a directory */ |
880 | if (!S_ISDIR(inode->i_mode)) { | |
881 | printk(KERN_WARNING | |
882 | "isofs_fill_super: root inode is not a directory. " | |
883 | "Corrupted media?\n"); | |
884 | goto out_iput; | |
885 | } | |
886 | ||
1da177e4 LT |
887 | /* get the root dentry */ |
888 | s->s_root = d_alloc_root(inode); | |
889 | if (!(s->s_root)) | |
890 | goto out_no_root; | |
891 | ||
892 | table = 0; | |
c3ed85a3 DJ |
893 | if (joliet_level) |
894 | table += 2; | |
895 | if (opt.check == 'r') | |
896 | table++; | |
1da177e4 LT |
897 | s->s_root->d_op = &isofs_dentry_ops[table]; |
898 | ||
f99d49ad | 899 | kfree(opt.iocharset); |
1da177e4 LT |
900 | |
901 | return 0; | |
902 | ||
903 | /* | |
904 | * Display error messages and free resources. | |
905 | */ | |
1da177e4 LT |
906 | out_iput: |
907 | iput(inode); | |
c4386c83 DH |
908 | goto out_no_inode; |
909 | out_no_root: | |
910 | error = PTR_ERR(inode); | |
911 | if (error != -ENOMEM) | |
912 | printk(KERN_WARNING "%s: get root inode failed\n", __func__); | |
913 | out_no_inode: | |
1da177e4 LT |
914 | #ifdef CONFIG_JOLIET |
915 | if (sbi->s_nls_iocharset) | |
916 | unload_nls(sbi->s_nls_iocharset); | |
917 | #endif | |
918 | goto out_freesbi; | |
919 | out_no_read: | |
c3ed85a3 DJ |
920 | printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n", |
921 | __func__, s->s_id, iso_blknum, block); | |
1da177e4 LT |
922 | goto out_freesbi; |
923 | out_bad_zone_size: | |
c3ed85a3 | 924 | printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n", |
1da177e4 LT |
925 | sbi->s_log_zone_size); |
926 | goto out_freebh; | |
927 | out_bad_size: | |
c3ed85a3 | 928 | printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n", |
1da177e4 LT |
929 | orig_zonesize, opt.blocksize); |
930 | goto out_freebh; | |
931 | out_unknown_format: | |
932 | if (!silent) | |
c3ed85a3 | 933 | printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n"); |
1da177e4 LT |
934 | |
935 | out_freebh: | |
936 | brelse(bh); | |
937 | out_freesbi: | |
f99d49ad | 938 | kfree(opt.iocharset); |
1da177e4 LT |
939 | kfree(sbi); |
940 | s->s_fs_info = NULL; | |
c4386c83 | 941 | return error; |
1da177e4 LT |
942 | } |
943 | ||
726c3342 | 944 | static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 945 | { |
726c3342 | 946 | struct super_block *sb = dentry->d_sb; |
2430c4da | 947 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
726c3342 | 948 | |
1da177e4 LT |
949 | buf->f_type = ISOFS_SUPER_MAGIC; |
950 | buf->f_bsize = sb->s_blocksize; | |
951 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones | |
c3ed85a3 | 952 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); |
1da177e4 LT |
953 | buf->f_bfree = 0; |
954 | buf->f_bavail = 0; | |
955 | buf->f_files = ISOFS_SB(sb)->s_ninodes; | |
956 | buf->f_ffree = 0; | |
2430c4da CL |
957 | buf->f_fsid.val[0] = (u32)id; |
958 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
959 | buf->f_namelen = NAME_MAX; |
960 | return 0; | |
961 | } | |
962 | ||
963 | /* | |
964 | * Get a set of blocks; filling in buffer_heads if already allocated | |
965 | * or getblk() if they are not. Returns the number of blocks inserted | |
c4386c83 | 966 | * (-ve == error.) |
1da177e4 LT |
967 | */ |
968 | int isofs_get_blocks(struct inode *inode, sector_t iblock_s, | |
969 | struct buffer_head **bh, unsigned long nblocks) | |
970 | { | |
971 | unsigned long b_off; | |
972 | unsigned offset, sect_size; | |
973 | unsigned int firstext; | |
974 | unsigned long nextblk, nextoff; | |
975 | long iblock = (long)iblock_s; | |
c4386c83 | 976 | int section, rv, error; |
1da177e4 LT |
977 | struct iso_inode_info *ei = ISOFS_I(inode); |
978 | ||
979 | lock_kernel(); | |
980 | ||
c4386c83 | 981 | error = -EIO; |
1da177e4 LT |
982 | rv = 0; |
983 | if (iblock < 0 || iblock != iblock_s) { | |
c3ed85a3 | 984 | printk(KERN_DEBUG "%s: block number too large\n", __func__); |
1da177e4 LT |
985 | goto abort; |
986 | } | |
987 | ||
988 | b_off = iblock; | |
c3ed85a3 DJ |
989 | |
990 | offset = 0; | |
991 | firstext = ei->i_first_extent; | |
1da177e4 | 992 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); |
c3ed85a3 DJ |
993 | nextblk = ei->i_next_section_block; |
994 | nextoff = ei->i_next_section_offset; | |
995 | section = 0; | |
1da177e4 | 996 | |
c3ed85a3 | 997 | while (nblocks) { |
1da177e4 LT |
998 | /* If we are *way* beyond the end of the file, print a message. |
999 | * Access beyond the end of the file up to the next page boundary | |
1000 | * is normal, however because of the way the page cache works. | |
1001 | * In this case, we just return 0 so that we can properly fill | |
1002 | * the page with useless information without generating any | |
1003 | * I/O errors. | |
1004 | */ | |
1005 | if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { | |
c3ed85a3 DJ |
1006 | printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n", |
1007 | __func__, iblock, (unsigned long) inode->i_size); | |
1da177e4 LT |
1008 | goto abort; |
1009 | } | |
c3ed85a3 | 1010 | |
fb50ae74 JRV |
1011 | /* On the last section, nextblk == 0, section size is likely to |
1012 | * exceed sect_size by a partial block, and access beyond the | |
1013 | * end of the file will reach beyond the section size, too. | |
1014 | */ | |
1015 | while (nextblk && (b_off >= (offset + sect_size))) { | |
1016 | struct inode *ninode; | |
1017 | ||
1018 | offset += sect_size; | |
1019 | ninode = isofs_iget(inode->i_sb, nextblk, nextoff); | |
c4386c83 DH |
1020 | if (IS_ERR(ninode)) { |
1021 | error = PTR_ERR(ninode); | |
fb50ae74 | 1022 | goto abort; |
c4386c83 | 1023 | } |
fb50ae74 JRV |
1024 | firstext = ISOFS_I(ninode)->i_first_extent; |
1025 | sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); | |
1026 | nextblk = ISOFS_I(ninode)->i_next_section_block; | |
1027 | nextoff = ISOFS_I(ninode)->i_next_section_offset; | |
1028 | iput(ninode); | |
1029 | ||
1030 | if (++section > 100) { | |
c3ed85a3 DJ |
1031 | printk(KERN_DEBUG "%s: More than 100 file sections ?!?" |
1032 | " aborting...\n", __func__); | |
1033 | printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u " | |
1034 | "nextblk=%lu nextoff=%lu\n", __func__, | |
1035 | iblock, firstext, (unsigned) sect_size, | |
1036 | nextblk, nextoff); | |
fb50ae74 | 1037 | goto abort; |
1da177e4 LT |
1038 | } |
1039 | } | |
c3ed85a3 DJ |
1040 | |
1041 | if (*bh) { | |
1da177e4 LT |
1042 | map_bh(*bh, inode->i_sb, firstext + b_off - offset); |
1043 | } else { | |
1044 | *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); | |
c3ed85a3 | 1045 | if (!*bh) |
1da177e4 LT |
1046 | goto abort; |
1047 | } | |
1048 | bh++; /* Next buffer head */ | |
1049 | b_off++; /* Next buffer offset */ | |
1050 | nblocks--; | |
1051 | rv++; | |
1052 | } | |
1053 | ||
c4386c83 | 1054 | error = 0; |
1da177e4 LT |
1055 | abort: |
1056 | unlock_kernel(); | |
c4386c83 | 1057 | return rv != 0 ? rv : error; |
1da177e4 LT |
1058 | } |
1059 | ||
1060 | /* | |
1061 | * Used by the standard interfaces. | |
1062 | */ | |
1063 | static int isofs_get_block(struct inode *inode, sector_t iblock, | |
1064 | struct buffer_head *bh_result, int create) | |
1065 | { | |
c4386c83 DH |
1066 | int ret; |
1067 | ||
9eb7f2c6 | 1068 | if (create) { |
c3ed85a3 | 1069 | printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__); |
1da177e4 LT |
1070 | return -EROFS; |
1071 | } | |
1072 | ||
c4386c83 DH |
1073 | ret = isofs_get_blocks(inode, iblock, &bh_result, 1); |
1074 | return ret < 0 ? ret : 0; | |
1da177e4 LT |
1075 | } |
1076 | ||
1077 | static int isofs_bmap(struct inode *inode, sector_t block) | |
1078 | { | |
1079 | struct buffer_head dummy; | |
1080 | int error; | |
1081 | ||
1082 | dummy.b_state = 0; | |
1083 | dummy.b_blocknr = -1000; | |
1084 | error = isofs_get_block(inode, block, &dummy, 0); | |
1085 | if (!error) | |
1086 | return dummy.b_blocknr; | |
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) | |
1091 | { | |
1092 | sector_t blknr = isofs_bmap(inode, block); | |
1093 | if (!blknr) | |
1094 | return NULL; | |
1095 | return sb_bread(inode->i_sb, blknr); | |
1096 | } | |
1097 | ||
1098 | static int isofs_readpage(struct file *file, struct page *page) | |
1099 | { | |
1100 | return block_read_full_page(page,isofs_get_block); | |
1101 | } | |
1102 | ||
1103 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) | |
1104 | { | |
1105 | return generic_block_bmap(mapping,block,isofs_get_block); | |
1106 | } | |
1107 | ||
f5e54d6e | 1108 | static const struct address_space_operations isofs_aops = { |
1da177e4 LT |
1109 | .readpage = isofs_readpage, |
1110 | .sync_page = block_sync_page, | |
1111 | .bmap = _isofs_bmap | |
1112 | }; | |
1113 | ||
9eb7f2c6 | 1114 | static int isofs_read_level3_size(struct inode *inode) |
1da177e4 LT |
1115 | { |
1116 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1117 | int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; | |
c3ed85a3 | 1118 | struct buffer_head *bh = NULL; |
1da177e4 LT |
1119 | unsigned long block, offset, block_saved, offset_saved; |
1120 | int i = 0; | |
1121 | int more_entries = 0; | |
c3ed85a3 | 1122 | struct iso_directory_record *tmpde = NULL; |
1da177e4 LT |
1123 | struct iso_inode_info *ei = ISOFS_I(inode); |
1124 | ||
1125 | inode->i_size = 0; | |
1126 | ||
1127 | /* The first 16 blocks are reserved as the System Area. Thus, | |
1128 | * no inodes can appear in block 0. We use this to flag that | |
1129 | * this is the last section. */ | |
1130 | ei->i_next_section_block = 0; | |
1131 | ei->i_next_section_offset = 0; | |
1132 | ||
1133 | block = ei->i_iget5_block; | |
1134 | offset = ei->i_iget5_offset; | |
1135 | ||
1136 | do { | |
c3ed85a3 | 1137 | struct iso_directory_record *de; |
1da177e4 LT |
1138 | unsigned int de_len; |
1139 | ||
1140 | if (!bh) { | |
1141 | bh = sb_bread(inode->i_sb, block); | |
1142 | if (!bh) | |
1143 | goto out_noread; | |
1144 | } | |
1145 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1146 | de_len = *(unsigned char *) de; | |
1147 | ||
1148 | if (de_len == 0) { | |
1149 | brelse(bh); | |
1150 | bh = NULL; | |
1151 | ++block; | |
1152 | offset = 0; | |
1153 | continue; | |
1154 | } | |
1155 | ||
1156 | block_saved = block; | |
1157 | offset_saved = offset; | |
1158 | offset += de_len; | |
1159 | ||
1160 | /* Make sure we have a full directory entry */ | |
1161 | if (offset >= bufsize) { | |
1162 | int slop = bufsize - offset + de_len; | |
1163 | if (!tmpde) { | |
1164 | tmpde = kmalloc(256, GFP_KERNEL); | |
1165 | if (!tmpde) | |
1166 | goto out_nomem; | |
1167 | } | |
1168 | memcpy(tmpde, de, slop); | |
1169 | offset &= bufsize - 1; | |
1170 | block++; | |
1171 | brelse(bh); | |
1172 | bh = NULL; | |
1173 | if (offset) { | |
1174 | bh = sb_bread(inode->i_sb, block); | |
1175 | if (!bh) | |
1176 | goto out_noread; | |
9eb7f2c6 | 1177 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
1da177e4 LT |
1178 | } |
1179 | de = tmpde; | |
1180 | } | |
1181 | ||
1182 | inode->i_size += isonum_733(de->size); | |
1183 | if (i == 1) { | |
1184 | ei->i_next_section_block = block_saved; | |
1185 | ei->i_next_section_offset = offset_saved; | |
1186 | } | |
1187 | ||
1188 | more_entries = de->flags[-high_sierra] & 0x80; | |
1189 | ||
1190 | i++; | |
9eb7f2c6 | 1191 | if (i > 100) |
1da177e4 | 1192 | goto out_toomany; |
9eb7f2c6 | 1193 | } while (more_entries); |
1da177e4 | 1194 | out: |
9eb7f2c6 | 1195 | kfree(tmpde); |
1da177e4 LT |
1196 | if (bh) |
1197 | brelse(bh); | |
1198 | return 0; | |
1199 | ||
1200 | out_nomem: | |
1201 | if (bh) | |
1202 | brelse(bh); | |
1203 | return -ENOMEM; | |
1204 | ||
1205 | out_noread: | |
1206 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); | |
f99d49ad | 1207 | kfree(tmpde); |
1da177e4 LT |
1208 | return -EIO; |
1209 | ||
1210 | out_toomany: | |
c3ed85a3 DJ |
1211 | printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n" |
1212 | "isofs_read_level3_size: inode=%lu\n", | |
1213 | __func__, inode->i_ino); | |
1da177e4 LT |
1214 | goto out; |
1215 | } | |
1216 | ||
c4386c83 | 1217 | static int isofs_read_inode(struct inode *inode) |
1da177e4 LT |
1218 | { |
1219 | struct super_block *sb = inode->i_sb; | |
1220 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
1221 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1222 | unsigned long block; | |
1223 | int high_sierra = sbi->s_high_sierra; | |
c3ed85a3 DJ |
1224 | struct buffer_head *bh = NULL; |
1225 | struct iso_directory_record *de; | |
1226 | struct iso_directory_record *tmpde = NULL; | |
1da177e4 LT |
1227 | unsigned int de_len; |
1228 | unsigned long offset; | |
1229 | struct iso_inode_info *ei = ISOFS_I(inode); | |
c4386c83 | 1230 | int ret = -EIO; |
1da177e4 LT |
1231 | |
1232 | block = ei->i_iget5_block; | |
1233 | bh = sb_bread(inode->i_sb, block); | |
1234 | if (!bh) | |
1235 | goto out_badread; | |
1236 | ||
1237 | offset = ei->i_iget5_offset; | |
1238 | ||
1239 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1240 | de_len = *(unsigned char *) de; | |
1241 | ||
1242 | if (offset + de_len > bufsize) { | |
1243 | int frag1 = bufsize - offset; | |
1244 | ||
1245 | tmpde = kmalloc(de_len, GFP_KERNEL); | |
1246 | if (tmpde == NULL) { | |
c3ed85a3 | 1247 | printk(KERN_INFO "%s: out of memory\n", __func__); |
c4386c83 | 1248 | ret = -ENOMEM; |
1da177e4 LT |
1249 | goto fail; |
1250 | } | |
1251 | memcpy(tmpde, bh->b_data + offset, frag1); | |
1252 | brelse(bh); | |
1253 | bh = sb_bread(inode->i_sb, ++block); | |
1254 | if (!bh) | |
1255 | goto out_badread; | |
1256 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); | |
1257 | de = tmpde; | |
1258 | } | |
1259 | ||
1260 | inode->i_ino = isofs_get_ino(ei->i_iget5_block, | |
c3ed85a3 DJ |
1261 | ei->i_iget5_offset, |
1262 | ISOFS_BUFFER_BITS(inode)); | |
1da177e4 LT |
1263 | |
1264 | /* Assume it is a normal-format file unless told otherwise */ | |
1265 | ei->i_file_format = isofs_file_normal; | |
1266 | ||
1267 | if (de->flags[-high_sierra] & 2) { | |
52b680c8 JK |
1268 | if (sbi->s_dmode != ISOFS_INVALID_MODE) |
1269 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1270 | else | |
1271 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
c3ed85a3 DJ |
1272 | inode->i_nlink = 1; /* |
1273 | * Set to 1. We know there are 2, but | |
1274 | * the find utility tries to optimize | |
1275 | * if it is 2, and it screws up. It is | |
1276 | * easier to give 1 which tells find to | |
1277 | * do it the hard way. | |
1278 | */ | |
1da177e4 | 1279 | } else { |
52b680c8 JK |
1280 | if (sbi->s_fmode != ISOFS_INVALID_MODE) { |
1281 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1282 | } else { | |
1283 | /* | |
1284 | * Set default permissions: r-x for all. The disc | |
1285 | * could be shared with DOS machines so virtually | |
1286 | * anything could be a valid executable. | |
1287 | */ | |
1288 | inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO; | |
1289 | } | |
1da177e4 | 1290 | inode->i_nlink = 1; |
1da177e4 LT |
1291 | } |
1292 | inode->i_uid = sbi->s_uid; | |
1293 | inode->i_gid = sbi->s_gid; | |
ba52de12 | 1294 | inode->i_blocks = 0; |
1da177e4 LT |
1295 | |
1296 | ei->i_format_parm[0] = 0; | |
1297 | ei->i_format_parm[1] = 0; | |
1298 | ei->i_format_parm[2] = 0; | |
1299 | ||
c3ed85a3 | 1300 | ei->i_section_size = isonum_733(de->size); |
9eb7f2c6 | 1301 | if (de->flags[-high_sierra] & 0x80) { |
c4386c83 DH |
1302 | ret = isofs_read_level3_size(inode); |
1303 | if (ret < 0) | |
c3ed85a3 | 1304 | goto fail; |
c4386c83 | 1305 | ret = -EIO; |
1da177e4 LT |
1306 | } else { |
1307 | ei->i_next_section_block = 0; | |
1308 | ei->i_next_section_offset = 0; | |
c3ed85a3 | 1309 | inode->i_size = isonum_733(de->size); |
1da177e4 LT |
1310 | } |
1311 | ||
1312 | /* | |
1313 | * Some dipshit decided to store some other bit of information | |
1314 | * in the high byte of the file length. Truncate size in case | |
1315 | * this CDROM was mounted with the cruft option. | |
1316 | */ | |
1317 | ||
5404ac8e | 1318 | if (sbi->s_cruft) |
1da177e4 LT |
1319 | inode->i_size &= 0x00ffffff; |
1320 | ||
1321 | if (de->interleave[0]) { | |
c3ed85a3 | 1322 | printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n"); |
1da177e4 LT |
1323 | inode->i_size = 0; |
1324 | } | |
1325 | ||
1326 | /* I have no idea what file_unit_size is used for, so | |
1327 | we will flag it for now */ | |
1328 | if (de->file_unit_size[0] != 0) { | |
c3ed85a3 DJ |
1329 | printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n", |
1330 | inode->i_ino); | |
1da177e4 LT |
1331 | } |
1332 | ||
1333 | /* I have no idea what other flag bits are used for, so | |
1334 | we will flag it for now */ | |
1335 | #ifdef DEBUG | |
1336 | if((de->flags[-high_sierra] & ~2)!= 0){ | |
c3ed85a3 DJ |
1337 | printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file " |
1338 | "(%ld %x).\n", | |
1339 | inode->i_ino, de->flags[-high_sierra]); | |
1da177e4 LT |
1340 | } |
1341 | #endif | |
1342 | ||
1343 | inode->i_mtime.tv_sec = | |
1344 | inode->i_atime.tv_sec = | |
1345 | inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); | |
1346 | inode->i_mtime.tv_nsec = | |
1347 | inode->i_atime.tv_nsec = | |
1348 | inode->i_ctime.tv_nsec = 0; | |
1349 | ||
c3ed85a3 DJ |
1350 | ei->i_first_extent = (isonum_733(de->extent) + |
1351 | isonum_711(de->ext_attr_length)); | |
1da177e4 LT |
1352 | |
1353 | /* Set the number of blocks for stat() - should be done before RR */ | |
c3ed85a3 | 1354 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1da177e4 LT |
1355 | |
1356 | /* | |
1357 | * Now test for possible Rock Ridge extensions which will override | |
1358 | * some of these numbers in the inode structure. | |
1359 | */ | |
1360 | ||
1361 | if (!high_sierra) { | |
1362 | parse_rock_ridge_inode(de, inode); | |
1363 | /* if we want uid/gid set, override the rock ridge setting */ | |
5c4a656b JK |
1364 | if (sbi->s_uid_set) |
1365 | inode->i_uid = sbi->s_uid; | |
1366 | if (sbi->s_gid_set) | |
1367 | inode->i_gid = sbi->s_gid; | |
1da177e4 | 1368 | } |
52b680c8 JK |
1369 | /* Now set final access rights if overriding rock ridge setting */ |
1370 | if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm && | |
1371 | sbi->s_dmode != ISOFS_INVALID_MODE) | |
1372 | inode->i_mode = S_IFDIR | sbi->s_dmode; | |
1373 | if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm && | |
1374 | sbi->s_fmode != ISOFS_INVALID_MODE) | |
1375 | inode->i_mode = S_IFREG | sbi->s_fmode; | |
1da177e4 LT |
1376 | |
1377 | /* Install the inode operations vector */ | |
1378 | if (S_ISREG(inode->i_mode)) { | |
1379 | inode->i_fop = &generic_ro_fops; | |
c3ed85a3 | 1380 | switch (ei->i_file_format) { |
1da177e4 LT |
1381 | #ifdef CONFIG_ZISOFS |
1382 | case isofs_file_compressed: | |
1383 | inode->i_data.a_ops = &zisofs_aops; | |
1384 | break; | |
1385 | #endif | |
1386 | default: | |
1387 | inode->i_data.a_ops = &isofs_aops; | |
1388 | break; | |
1389 | } | |
1390 | } else if (S_ISDIR(inode->i_mode)) { | |
1391 | inode->i_op = &isofs_dir_inode_operations; | |
1392 | inode->i_fop = &isofs_dir_operations; | |
1393 | } else if (S_ISLNK(inode->i_mode)) { | |
1394 | inode->i_op = &page_symlink_inode_operations; | |
1395 | inode->i_data.a_ops = &isofs_symlink_aops; | |
1396 | } else | |
1397 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ | |
1398 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1399 | ||
c4386c83 | 1400 | ret = 0; |
9eb7f2c6 | 1401 | out: |
f99d49ad | 1402 | kfree(tmpde); |
1da177e4 LT |
1403 | if (bh) |
1404 | brelse(bh); | |
c4386c83 | 1405 | return ret; |
1da177e4 | 1406 | |
9eb7f2c6 | 1407 | out_badread: |
1da177e4 | 1408 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); |
9eb7f2c6 | 1409 | fail: |
1da177e4 LT |
1410 | goto out; |
1411 | } | |
1412 | ||
1413 | struct isofs_iget5_callback_data { | |
1414 | unsigned long block; | |
1415 | unsigned long offset; | |
1416 | }; | |
1417 | ||
1418 | static int isofs_iget5_test(struct inode *ino, void *data) | |
1419 | { | |
1420 | struct iso_inode_info *i = ISOFS_I(ino); | |
1421 | struct isofs_iget5_callback_data *d = | |
1422 | (struct isofs_iget5_callback_data*)data; | |
1423 | return (i->i_iget5_block == d->block) | |
c3ed85a3 | 1424 | && (i->i_iget5_offset == d->offset); |
1da177e4 LT |
1425 | } |
1426 | ||
1427 | static int isofs_iget5_set(struct inode *ino, void *data) | |
1428 | { | |
1429 | struct iso_inode_info *i = ISOFS_I(ino); | |
1430 | struct isofs_iget5_callback_data *d = | |
1431 | (struct isofs_iget5_callback_data*)data; | |
1432 | i->i_iget5_block = d->block; | |
1433 | i->i_iget5_offset = d->offset; | |
1434 | return 0; | |
1435 | } | |
1436 | ||
1437 | /* Store, in the inode's containing structure, the block and block | |
1438 | * offset that point to the underlying meta-data for the inode. The | |
1439 | * code below is otherwise similar to the iget() code in | |
1440 | * include/linux/fs.h */ | |
1441 | struct inode *isofs_iget(struct super_block *sb, | |
1442 | unsigned long block, | |
1443 | unsigned long offset) | |
1444 | { | |
1445 | unsigned long hashval; | |
1446 | struct inode *inode; | |
1447 | struct isofs_iget5_callback_data data; | |
c4386c83 | 1448 | long ret; |
1da177e4 LT |
1449 | |
1450 | if (offset >= 1ul << sb->s_blocksize_bits) | |
c4386c83 | 1451 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
1452 | |
1453 | data.block = block; | |
1454 | data.offset = offset; | |
1455 | ||
1456 | hashval = (block << sb->s_blocksize_bits) | offset; | |
1457 | ||
9eb7f2c6 | 1458 | inode = iget5_locked(sb, hashval, &isofs_iget5_test, |
c3ed85a3 | 1459 | &isofs_iget5_set, &data); |
1da177e4 | 1460 | |
c4386c83 DH |
1461 | if (!inode) |
1462 | return ERR_PTR(-ENOMEM); | |
1463 | ||
1464 | if (inode->i_state & I_NEW) { | |
1465 | ret = isofs_read_inode(inode); | |
1466 | if (ret < 0) { | |
1467 | iget_failed(inode); | |
1468 | inode = ERR_PTR(ret); | |
1469 | } else { | |
1470 | unlock_new_inode(inode); | |
1471 | } | |
1da177e4 LT |
1472 | } |
1473 | ||
1474 | return inode; | |
1475 | } | |
1476 | ||
454e2398 DH |
1477 | static int isofs_get_sb(struct file_system_type *fs_type, |
1478 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 1479 | { |
454e2398 | 1480 | return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super, |
c3ed85a3 | 1481 | mnt); |
1da177e4 LT |
1482 | } |
1483 | ||
1484 | static struct file_system_type iso9660_fs_type = { | |
1485 | .owner = THIS_MODULE, | |
1486 | .name = "iso9660", | |
1487 | .get_sb = isofs_get_sb, | |
1488 | .kill_sb = kill_block_super, | |
1489 | .fs_flags = FS_REQUIRES_DEV, | |
1490 | }; | |
1491 | ||
1492 | static int __init init_iso9660_fs(void) | |
1493 | { | |
1494 | int err = init_inodecache(); | |
1495 | if (err) | |
1496 | goto out; | |
1497 | #ifdef CONFIG_ZISOFS | |
1498 | err = zisofs_init(); | |
1499 | if (err) | |
1500 | goto out1; | |
1501 | #endif | |
1502 | err = register_filesystem(&iso9660_fs_type); | |
1503 | if (err) | |
1504 | goto out2; | |
1505 | return 0; | |
1506 | out2: | |
1507 | #ifdef CONFIG_ZISOFS | |
1508 | zisofs_cleanup(); | |
1509 | out1: | |
1510 | #endif | |
1511 | destroy_inodecache(); | |
1512 | out: | |
1513 | return err; | |
1514 | } | |
1515 | ||
1516 | static void __exit exit_iso9660_fs(void) | |
1517 | { | |
1518 | unregister_filesystem(&iso9660_fs_type); | |
1519 | #ifdef CONFIG_ZISOFS | |
1520 | zisofs_cleanup(); | |
1521 | #endif | |
1522 | destroy_inodecache(); | |
1523 | } | |
1524 | ||
1525 | module_init(init_iso9660_fs) | |
1526 | module_exit(exit_iso9660_fs) | |
1527 | MODULE_LICENSE("GPL"); | |
1528 | /* Actual filesystem name is iso9660, as requested in filesystems.c */ | |
1529 | MODULE_ALIAS("iso9660"); |