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Commit | Line | Data |
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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. | |
6 | * 1994 Eberhard Moenkeberg - multi session handling. | |
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); | |
45 | #ifdef CONFIG_JOLIET | |
46 | if (sbi->s_nls_iocharset) { | |
47 | unload_nls(sbi->s_nls_iocharset); | |
48 | sbi->s_nls_iocharset = NULL; | |
49 | } | |
50 | #endif | |
51 | ||
1da177e4 LT |
52 | kfree(sbi); |
53 | sb->s_fs_info = NULL; | |
54 | return; | |
55 | } | |
56 | ||
57 | static void isofs_read_inode(struct inode *); | |
726c3342 | 58 | static int isofs_statfs (struct dentry *, struct kstatfs *); |
1da177e4 | 59 | |
e18b890b | 60 | static struct kmem_cache *isofs_inode_cachep; |
1da177e4 LT |
61 | |
62 | static struct inode *isofs_alloc_inode(struct super_block *sb) | |
63 | { | |
64 | struct iso_inode_info *ei; | |
e94b1766 | 65 | ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
66 | if (!ei) |
67 | return NULL; | |
68 | return &ei->vfs_inode; | |
69 | } | |
70 | ||
71 | static void isofs_destroy_inode(struct inode *inode) | |
72 | { | |
73 | kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); | |
74 | } | |
75 | ||
e18b890b | 76 | static void init_once(void *foo, struct kmem_cache * cachep, unsigned long flags) |
1da177e4 | 77 | { |
9eb7f2c6 | 78 | struct iso_inode_info *ei = foo; |
1da177e4 | 79 | |
a35afb83 | 80 | inode_init_once(&ei->vfs_inode); |
1da177e4 LT |
81 | } |
82 | ||
83 | static int init_inodecache(void) | |
84 | { | |
85 | isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", | |
86 | sizeof(struct iso_inode_info), | |
fffb60f9 PJ |
87 | 0, (SLAB_RECLAIM_ACCOUNT| |
88 | SLAB_MEM_SPREAD), | |
1da177e4 LT |
89 | init_once, NULL); |
90 | if (isofs_inode_cachep == NULL) | |
91 | return -ENOMEM; | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static void destroy_inodecache(void) | |
96 | { | |
1a1d92c1 | 97 | kmem_cache_destroy(isofs_inode_cachep); |
1da177e4 LT |
98 | } |
99 | ||
100 | static int isofs_remount(struct super_block *sb, int *flags, char *data) | |
101 | { | |
102 | /* we probably want a lot more here */ | |
103 | *flags |= MS_RDONLY; | |
104 | return 0; | |
105 | } | |
106 | ||
ee9b6d61 | 107 | static const struct super_operations isofs_sops = { |
1da177e4 LT |
108 | .alloc_inode = isofs_alloc_inode, |
109 | .destroy_inode = isofs_destroy_inode, | |
110 | .read_inode = isofs_read_inode, | |
111 | .put_super = isofs_put_super, | |
112 | .statfs = isofs_statfs, | |
113 | .remount_fs = isofs_remount, | |
114 | }; | |
115 | ||
116 | ||
117 | static struct dentry_operations isofs_dentry_ops[] = { | |
118 | { | |
119 | .d_hash = isofs_hash, | |
120 | .d_compare = isofs_dentry_cmp, | |
121 | }, | |
122 | { | |
123 | .d_hash = isofs_hashi, | |
124 | .d_compare = isofs_dentry_cmpi, | |
125 | }, | |
126 | #ifdef CONFIG_JOLIET | |
127 | { | |
128 | .d_hash = isofs_hash_ms, | |
129 | .d_compare = isofs_dentry_cmp_ms, | |
130 | }, | |
131 | { | |
132 | .d_hash = isofs_hashi_ms, | |
133 | .d_compare = isofs_dentry_cmpi_ms, | |
9eb7f2c6 | 134 | }, |
1da177e4 LT |
135 | #endif |
136 | }; | |
137 | ||
138 | struct iso9660_options{ | |
139 | char map; | |
140 | char rock; | |
141 | char joliet; | |
142 | char cruft; | |
9769f4eb JW |
143 | char hide; |
144 | char showassoc; | |
1da177e4 LT |
145 | char nocompress; |
146 | unsigned char check; | |
147 | unsigned int blocksize; | |
148 | mode_t mode; | |
149 | gid_t gid; | |
150 | uid_t uid; | |
151 | char *iocharset; | |
152 | unsigned char utf8; | |
153 | /* LVE */ | |
154 | s32 session; | |
155 | s32 sbsector; | |
156 | }; | |
157 | ||
158 | /* | |
159 | * Compute the hash for the isofs name corresponding to the dentry. | |
160 | */ | |
161 | static int | |
162 | isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms) | |
163 | { | |
164 | const char *name; | |
165 | int len; | |
166 | ||
167 | len = qstr->len; | |
168 | name = qstr->name; | |
169 | if (ms) { | |
170 | while (len && name[len-1] == '.') | |
171 | len--; | |
172 | } | |
173 | ||
174 | qstr->hash = full_name_hash(name, len); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Compute the hash for the isofs name corresponding to the dentry. | |
181 | */ | |
182 | static int | |
183 | isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms) | |
184 | { | |
185 | const char *name; | |
186 | int len; | |
187 | char c; | |
188 | unsigned long hash; | |
189 | ||
190 | len = qstr->len; | |
191 | name = qstr->name; | |
192 | if (ms) { | |
193 | while (len && name[len-1] == '.') | |
194 | len--; | |
195 | } | |
196 | ||
197 | hash = init_name_hash(); | |
198 | while (len--) { | |
199 | c = tolower(*name++); | |
200 | hash = partial_name_hash(tolower(c), hash); | |
201 | } | |
202 | qstr->hash = end_name_hash(hash); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Case insensitive compare of two isofs names. | |
209 | */ | |
9eb7f2c6 AM |
210 | static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a, |
211 | struct qstr *b, int ms) | |
1da177e4 LT |
212 | { |
213 | int alen, blen; | |
214 | ||
215 | /* A filename cannot end in '.' or we treat it like it has none */ | |
216 | alen = a->len; | |
217 | blen = b->len; | |
218 | if (ms) { | |
219 | while (alen && a->name[alen-1] == '.') | |
220 | alen--; | |
221 | while (blen && b->name[blen-1] == '.') | |
222 | blen--; | |
223 | } | |
224 | if (alen == blen) { | |
225 | if (strnicmp(a->name, b->name, alen) == 0) | |
226 | return 0; | |
227 | } | |
228 | return 1; | |
229 | } | |
230 | ||
231 | /* | |
232 | * Case sensitive compare of two isofs names. | |
233 | */ | |
9eb7f2c6 AM |
234 | static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a, |
235 | struct qstr *b, int ms) | |
1da177e4 LT |
236 | { |
237 | int alen, blen; | |
238 | ||
239 | /* A filename cannot end in '.' or we treat it like it has none */ | |
240 | alen = a->len; | |
241 | blen = b->len; | |
242 | if (ms) { | |
243 | while (alen && a->name[alen-1] == '.') | |
244 | alen--; | |
245 | while (blen && b->name[blen-1] == '.') | |
246 | blen--; | |
247 | } | |
248 | if (alen == blen) { | |
249 | if (strncmp(a->name, b->name, alen) == 0) | |
250 | return 0; | |
251 | } | |
252 | return 1; | |
253 | } | |
254 | ||
255 | static int | |
256 | isofs_hash(struct dentry *dentry, struct qstr *qstr) | |
257 | { | |
258 | return isofs_hash_common(dentry, qstr, 0); | |
259 | } | |
260 | ||
261 | static int | |
262 | isofs_hashi(struct dentry *dentry, struct qstr *qstr) | |
263 | { | |
264 | return isofs_hashi_common(dentry, qstr, 0); | |
265 | } | |
266 | ||
267 | static int | |
268 | isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
269 | { | |
270 | return isofs_dentry_cmp_common(dentry, a, b, 0); | |
271 | } | |
272 | ||
273 | static int | |
274 | isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
275 | { | |
276 | return isofs_dentry_cmpi_common(dentry, a, b, 0); | |
277 | } | |
278 | ||
279 | #ifdef CONFIG_JOLIET | |
280 | static int | |
281 | isofs_hash_ms(struct dentry *dentry, struct qstr *qstr) | |
282 | { | |
283 | return isofs_hash_common(dentry, qstr, 1); | |
284 | } | |
285 | ||
286 | static int | |
287 | isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr) | |
288 | { | |
289 | return isofs_hashi_common(dentry, qstr, 1); | |
290 | } | |
291 | ||
292 | static int | |
293 | isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
294 | { | |
295 | return isofs_dentry_cmp_common(dentry, a, b, 1); | |
296 | } | |
297 | ||
298 | static int | |
299 | isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
300 | { | |
301 | return isofs_dentry_cmpi_common(dentry, a, b, 1); | |
302 | } | |
303 | #endif | |
304 | ||
305 | enum { | |
306 | Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, | |
307 | Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, | |
308 | Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, | |
9769f4eb | 309 | Opt_nocompress, Opt_hide, Opt_showassoc, |
1da177e4 LT |
310 | }; |
311 | ||
312 | static match_table_t tokens = { | |
313 | {Opt_norock, "norock"}, | |
314 | {Opt_nojoliet, "nojoliet"}, | |
315 | {Opt_unhide, "unhide"}, | |
9769f4eb JW |
316 | {Opt_hide, "hide"}, |
317 | {Opt_showassoc, "showassoc"}, | |
1da177e4 LT |
318 | {Opt_cruft, "cruft"}, |
319 | {Opt_utf8, "utf8"}, | |
320 | {Opt_iocharset, "iocharset=%s"}, | |
321 | {Opt_map_a, "map=acorn"}, | |
322 | {Opt_map_a, "map=a"}, | |
323 | {Opt_map_n, "map=normal"}, | |
324 | {Opt_map_n, "map=n"}, | |
325 | {Opt_map_o, "map=off"}, | |
326 | {Opt_map_o, "map=o"}, | |
327 | {Opt_session, "session=%u"}, | |
328 | {Opt_sb, "sbsector=%u"}, | |
329 | {Opt_check_r, "check=relaxed"}, | |
330 | {Opt_check_r, "check=r"}, | |
331 | {Opt_check_s, "check=strict"}, | |
332 | {Opt_check_s, "check=s"}, | |
333 | {Opt_uid, "uid=%u"}, | |
334 | {Opt_gid, "gid=%u"}, | |
335 | {Opt_mode, "mode=%u"}, | |
336 | {Opt_block, "block=%u"}, | |
337 | {Opt_ignore, "conv=binary"}, | |
338 | {Opt_ignore, "conv=b"}, | |
339 | {Opt_ignore, "conv=text"}, | |
340 | {Opt_ignore, "conv=t"}, | |
341 | {Opt_ignore, "conv=mtext"}, | |
342 | {Opt_ignore, "conv=m"}, | |
343 | {Opt_ignore, "conv=auto"}, | |
344 | {Opt_ignore, "conv=a"}, | |
345 | {Opt_nocompress, "nocompress"}, | |
346 | {Opt_err, NULL} | |
347 | }; | |
348 | ||
9eb7f2c6 | 349 | static int parse_options(char *options, struct iso9660_options *popt) |
1da177e4 LT |
350 | { |
351 | char *p; | |
352 | int option; | |
353 | ||
354 | popt->map = 'n'; | |
355 | popt->rock = 'y'; | |
356 | popt->joliet = 'y'; | |
357 | popt->cruft = 'n'; | |
9769f4eb JW |
358 | popt->hide = 'n'; |
359 | popt->showassoc = 'n'; | |
1da177e4 LT |
360 | popt->check = 'u'; /* unset */ |
361 | popt->nocompress = 0; | |
362 | popt->blocksize = 1024; | |
363 | popt->mode = S_IRUGO | S_IXUGO; /* r-x for all. The disc could | |
364 | be shared with DOS machines so | |
365 | virtually anything could be | |
366 | a valid executable. */ | |
367 | popt->gid = 0; | |
368 | popt->uid = 0; | |
369 | popt->iocharset = NULL; | |
370 | popt->utf8 = 0; | |
371 | popt->session=-1; | |
372 | popt->sbsector=-1; | |
373 | if (!options) | |
374 | return 1; | |
375 | ||
376 | while ((p = strsep(&options, ",")) != NULL) { | |
377 | int token; | |
378 | substring_t args[MAX_OPT_ARGS]; | |
379 | unsigned n; | |
380 | ||
381 | if (!*p) | |
382 | continue; | |
383 | ||
384 | token = match_token(p, tokens, args); | |
385 | switch (token) { | |
386 | case Opt_norock: | |
387 | popt->rock = 'n'; | |
388 | break; | |
389 | case Opt_nojoliet: | |
390 | popt->joliet = 'n'; | |
391 | break; | |
9769f4eb JW |
392 | case Opt_hide: |
393 | popt->hide = 'y'; | |
394 | break; | |
1da177e4 | 395 | case Opt_unhide: |
9769f4eb JW |
396 | case Opt_showassoc: |
397 | popt->showassoc = 'y'; | |
1da177e4 LT |
398 | break; |
399 | case Opt_cruft: | |
400 | popt->cruft = 'y'; | |
401 | break; | |
402 | case Opt_utf8: | |
403 | popt->utf8 = 1; | |
404 | break; | |
405 | #ifdef CONFIG_JOLIET | |
406 | case Opt_iocharset: | |
407 | popt->iocharset = match_strdup(&args[0]); | |
408 | break; | |
409 | #endif | |
410 | case Opt_map_a: | |
411 | popt->map = 'a'; | |
412 | break; | |
413 | case Opt_map_o: | |
414 | popt->map = 'o'; | |
415 | break; | |
416 | case Opt_map_n: | |
417 | popt->map = 'n'; | |
418 | break; | |
419 | case Opt_session: | |
420 | if (match_int(&args[0], &option)) | |
421 | return 0; | |
422 | n = option; | |
423 | if (n > 99) | |
424 | return 0; | |
425 | popt->session = n + 1; | |
426 | break; | |
427 | case Opt_sb: | |
428 | if (match_int(&args[0], &option)) | |
429 | return 0; | |
430 | popt->sbsector = option; | |
431 | break; | |
432 | case Opt_check_r: | |
433 | popt->check = 'r'; | |
434 | break; | |
435 | case Opt_check_s: | |
436 | popt->check = 's'; | |
437 | break; | |
438 | case Opt_ignore: | |
439 | break; | |
440 | case Opt_uid: | |
441 | if (match_int(&args[0], &option)) | |
442 | return 0; | |
443 | popt->uid = option; | |
444 | break; | |
445 | case Opt_gid: | |
446 | if (match_int(&args[0], &option)) | |
447 | return 0; | |
448 | popt->gid = option; | |
449 | break; | |
450 | case Opt_mode: | |
451 | if (match_int(&args[0], &option)) | |
452 | return 0; | |
453 | popt->mode = option; | |
454 | break; | |
455 | case Opt_block: | |
456 | if (match_int(&args[0], &option)) | |
457 | return 0; | |
458 | n = option; | |
459 | if (n != 512 && n != 1024 && n != 2048) | |
460 | return 0; | |
461 | popt->blocksize = n; | |
462 | break; | |
463 | case Opt_nocompress: | |
464 | popt->nocompress = 1; | |
465 | break; | |
466 | default: | |
467 | return 0; | |
468 | } | |
469 | } | |
470 | return 1; | |
471 | } | |
472 | ||
473 | /* | |
474 | * look if the driver can tell the multi session redirection value | |
475 | * | |
476 | * don't change this if you don't know what you do, please! | |
477 | * Multisession is legal only with XA disks. | |
478 | * A non-XA disk with more than one volume descriptor may do it right, but | |
479 | * usually is written in a nowhere standardized "multi-partition" manner. | |
480 | * Multisession uses absolute addressing (solely the first frame of the whole | |
481 | * track is #0), multi-partition uses relative addressing (each first frame of | |
482 | * each track is #0), and a track is not a session. | |
483 | * | |
484 | * A broken CDwriter software or drive firmware does not set new standards, | |
485 | * at least not if conflicting with the existing ones. | |
486 | * | |
487 | * emoenke@gwdg.de | |
488 | */ | |
489 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
490 | ||
9eb7f2c6 | 491 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
1da177e4 LT |
492 | { |
493 | struct cdrom_multisession ms_info; | |
494 | unsigned int vol_desc_start; | |
495 | struct block_device *bdev = sb->s_bdev; | |
496 | int i; | |
497 | ||
498 | vol_desc_start=0; | |
499 | ms_info.addr_format=CDROM_LBA; | |
500 | if(session >= 0 && session <= 99) { | |
501 | struct cdrom_tocentry Te; | |
502 | Te.cdte_track=session; | |
503 | Te.cdte_format=CDROM_LBA; | |
504 | i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); | |
505 | if (!i) { | |
506 | printk(KERN_DEBUG "Session %d start %d type %d\n", | |
507 | session, Te.cdte_addr.lba, | |
508 | Te.cdte_ctrl&CDROM_DATA_TRACK); | |
509 | if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) | |
510 | return Te.cdte_addr.lba; | |
511 | } | |
512 | ||
513 | printk(KERN_ERR "Invalid session number or type of track\n"); | |
514 | } | |
515 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); | |
9eb7f2c6 AM |
516 | if (session > 0) |
517 | printk(KERN_ERR "Invalid session number\n"); | |
1da177e4 LT |
518 | #if 0 |
519 | printk("isofs.inode: CDROMMULTISESSION: rc=%d\n",i); | |
520 | if (i==0) { | |
521 | printk("isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); | |
522 | printk("isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); | |
523 | } | |
524 | #endif | |
525 | if (i==0) | |
526 | #if WE_OBEY_THE_WRITTEN_STANDARDS | |
527 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ | |
528 | #endif | |
529 | vol_desc_start=ms_info.addr.lba; | |
530 | return vol_desc_start; | |
531 | } | |
532 | ||
533 | /* | |
534 | * Initialize the superblock and read the root inode. | |
535 | * | |
536 | * Note: a check_disk_change() has been done immediately prior | |
537 | * to this call, so we don't need to check again. | |
538 | */ | |
539 | static int isofs_fill_super(struct super_block *s, void *data, int silent) | |
540 | { | |
541 | struct buffer_head * bh = NULL, *pri_bh = NULL; | |
542 | struct hs_primary_descriptor * h_pri = NULL; | |
543 | struct iso_primary_descriptor * pri = NULL; | |
544 | struct iso_supplementary_descriptor *sec = NULL; | |
545 | struct iso_directory_record * rootp; | |
546 | int joliet_level = 0; | |
547 | int iso_blknum, block; | |
548 | int orig_zonesize; | |
549 | int table; | |
550 | unsigned int vol_desc_start; | |
551 | unsigned long first_data_zone; | |
552 | struct inode * inode; | |
553 | struct iso9660_options opt; | |
554 | struct isofs_sb_info * sbi; | |
555 | ||
f8314dc6 | 556 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 LT |
557 | if (!sbi) |
558 | return -ENOMEM; | |
559 | s->s_fs_info = sbi; | |
1da177e4 | 560 | |
9eb7f2c6 | 561 | if (!parse_options((char *)data, &opt)) |
1da177e4 LT |
562 | goto out_freesbi; |
563 | ||
564 | /* | |
565 | * First of all, get the hardware blocksize for this device. | |
566 | * If we don't know what it is, or the hardware blocksize is | |
567 | * larger than the blocksize the user specified, then use | |
568 | * that value. | |
569 | */ | |
570 | /* | |
571 | * What if bugger tells us to go beyond page size? | |
572 | */ | |
573 | opt.blocksize = sb_min_blocksize(s, opt.blocksize); | |
574 | ||
575 | sbi->s_high_sierra = 0; /* default is iso9660 */ | |
576 | ||
577 | vol_desc_start = (opt.sbsector != -1) ? | |
578 | opt.sbsector : isofs_get_last_session(s,opt.session); | |
579 | ||
580 | for (iso_blknum = vol_desc_start+16; | |
581 | iso_blknum < vol_desc_start+100; iso_blknum++) | |
582 | { | |
583 | struct hs_volume_descriptor * hdp; | |
584 | struct iso_volume_descriptor * vdp; | |
585 | ||
586 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); | |
587 | if (!(bh = sb_bread(s, block))) | |
588 | goto out_no_read; | |
589 | ||
590 | vdp = (struct iso_volume_descriptor *)bh->b_data; | |
591 | hdp = (struct hs_volume_descriptor *)bh->b_data; | |
592 | ||
593 | /* Due to the overlapping physical location of the descriptors, | |
594 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure | |
595 | * proper identification in this case, we first check for ISO. | |
596 | */ | |
597 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { | |
598 | if (isonum_711 (vdp->type) == ISO_VD_END) | |
599 | break; | |
600 | if (isonum_711 (vdp->type) == ISO_VD_PRIMARY) { | |
601 | if (pri == NULL) { | |
602 | pri = (struct iso_primary_descriptor *)vdp; | |
603 | /* Save the buffer in case we need it ... */ | |
604 | pri_bh = bh; | |
605 | bh = NULL; | |
606 | } | |
607 | } | |
608 | #ifdef CONFIG_JOLIET | |
609 | else if (isonum_711 (vdp->type) == ISO_VD_SUPPLEMENTARY) { | |
610 | sec = (struct iso_supplementary_descriptor *)vdp; | |
611 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { | |
612 | if (opt.joliet == 'y') { | |
613 | if (sec->escape[2] == 0x40) { | |
614 | joliet_level = 1; | |
615 | } else if (sec->escape[2] == 0x43) { | |
616 | joliet_level = 2; | |
617 | } else if (sec->escape[2] == 0x45) { | |
618 | joliet_level = 3; | |
619 | } | |
620 | printk(KERN_DEBUG"ISO 9660 Extensions: Microsoft Joliet Level %d\n", | |
621 | joliet_level); | |
622 | } | |
623 | goto root_found; | |
624 | } else { | |
625 | /* Unknown supplementary volume descriptor */ | |
626 | sec = NULL; | |
627 | } | |
628 | } | |
629 | #endif | |
630 | } else { | |
631 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { | |
632 | if (isonum_711 (hdp->type) != ISO_VD_PRIMARY) | |
633 | goto out_freebh; | |
634 | ||
635 | sbi->s_high_sierra = 1; | |
636 | opt.rock = 'n'; | |
637 | h_pri = (struct hs_primary_descriptor *)vdp; | |
638 | goto root_found; | |
639 | } | |
640 | } | |
641 | ||
642 | /* Just skip any volume descriptors we don't recognize */ | |
643 | ||
644 | brelse(bh); | |
645 | bh = NULL; | |
646 | } | |
647 | /* | |
648 | * If we fall through, either no volume descriptor was found, | |
649 | * or else we passed a primary descriptor looking for others. | |
650 | */ | |
651 | if (!pri) | |
652 | goto out_unknown_format; | |
653 | brelse(bh); | |
654 | bh = pri_bh; | |
655 | pri_bh = NULL; | |
656 | ||
657 | root_found: | |
658 | ||
659 | if (joliet_level && (pri == NULL || opt.rock == 'n')) { | |
660 | /* This is the case of Joliet with the norock mount flag. | |
661 | * A disc with both Joliet and Rock Ridge is handled later | |
662 | */ | |
663 | pri = (struct iso_primary_descriptor *) sec; | |
664 | } | |
665 | ||
666 | if(sbi->s_high_sierra){ | |
667 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; | |
668 | sbi->s_nzones = isonum_733 (h_pri->volume_space_size); | |
669 | sbi->s_log_zone_size = isonum_723 (h_pri->logical_block_size); | |
670 | sbi->s_max_size = isonum_733(h_pri->volume_space_size); | |
671 | } else { | |
672 | if (!pri) | |
673 | goto out_freebh; | |
674 | rootp = (struct iso_directory_record *) pri->root_directory_record; | |
675 | sbi->s_nzones = isonum_733 (pri->volume_space_size); | |
676 | sbi->s_log_zone_size = isonum_723 (pri->logical_block_size); | |
677 | sbi->s_max_size = isonum_733(pri->volume_space_size); | |
678 | } | |
679 | ||
680 | sbi->s_ninodes = 0; /* No way to figure this out easily */ | |
681 | ||
682 | orig_zonesize = sbi->s_log_zone_size; | |
683 | /* | |
684 | * If the zone size is smaller than the hardware sector size, | |
685 | * this is a fatal error. This would occur if the disc drive | |
686 | * had sectors that were 2048 bytes, but the filesystem had | |
687 | * blocks that were 512 bytes (which should only very rarely | |
688 | * happen.) | |
689 | */ | |
690 | if(orig_zonesize < opt.blocksize) | |
691 | goto out_bad_size; | |
692 | ||
693 | /* RDE: convert log zone size to bit shift */ | |
694 | switch (sbi->s_log_zone_size) | |
695 | { case 512: sbi->s_log_zone_size = 9; break; | |
696 | case 1024: sbi->s_log_zone_size = 10; break; | |
697 | case 2048: sbi->s_log_zone_size = 11; break; | |
698 | ||
699 | default: | |
700 | goto out_bad_zone_size; | |
701 | } | |
702 | ||
703 | s->s_magic = ISOFS_SUPER_MAGIC; | |
704 | s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */ | |
705 | ||
706 | /* The CDROM is read-only, has no nodes (devices) on it, and since | |
707 | all of the files appear to be owned by root, we really do not want | |
708 | to allow suid. (suid or devices will not show up unless we have | |
709 | Rock Ridge extensions) */ | |
710 | ||
711 | s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; | |
712 | ||
713 | /* Set this for reference. Its not currently used except on write | |
714 | which we don't have .. */ | |
715 | ||
716 | first_data_zone = isonum_733 (rootp->extent) + | |
717 | isonum_711 (rootp->ext_attr_length); | |
718 | sbi->s_firstdatazone = first_data_zone; | |
719 | #ifndef BEQUIET | |
720 | printk(KERN_DEBUG "Max size:%ld Log zone size:%ld\n", | |
721 | sbi->s_max_size, | |
722 | 1UL << sbi->s_log_zone_size); | |
723 | printk(KERN_DEBUG "First datazone:%ld\n", sbi->s_firstdatazone); | |
724 | if(sbi->s_high_sierra) | |
725 | printk(KERN_DEBUG "Disc in High Sierra format.\n"); | |
726 | #endif | |
727 | ||
728 | /* | |
729 | * If the Joliet level is set, we _may_ decide to use the | |
730 | * secondary descriptor, but can't be sure until after we | |
731 | * read the root inode. But before reading the root inode | |
732 | * we may need to change the device blocksize, and would | |
733 | * rather release the old buffer first. So, we cache the | |
734 | * first_data_zone value from the secondary descriptor. | |
735 | */ | |
736 | if (joliet_level) { | |
737 | pri = (struct iso_primary_descriptor *) sec; | |
738 | rootp = (struct iso_directory_record *) | |
739 | pri->root_directory_record; | |
740 | first_data_zone = isonum_733 (rootp->extent) + | |
741 | isonum_711 (rootp->ext_attr_length); | |
742 | } | |
743 | ||
744 | /* | |
745 | * We're all done using the volume descriptor, and may need | |
746 | * to change the device blocksize, so release the buffer now. | |
747 | */ | |
748 | brelse(pri_bh); | |
749 | brelse(bh); | |
750 | ||
751 | /* | |
752 | * Force the blocksize to 512 for 512 byte sectors. The file | |
753 | * read primitives really get it wrong in a bad way if we don't | |
754 | * do this. | |
755 | * | |
756 | * Note - we should never be setting the blocksize to something | |
757 | * less than the hardware sector size for the device. If we | |
758 | * do, we would end up having to read larger buffers and split | |
759 | * out portions to satisfy requests. | |
760 | * | |
761 | * Note2- the idea here is that we want to deal with the optimal | |
762 | * zonesize in the filesystem. If we have it set to something less, | |
763 | * then we have horrible problems with trying to piece together | |
764 | * bits of adjacent blocks in order to properly read directory | |
765 | * entries. By forcing the blocksize in this way, we ensure | |
766 | * that we will never be required to do this. | |
767 | */ | |
768 | sb_set_blocksize(s, orig_zonesize); | |
769 | ||
770 | sbi->s_nls_iocharset = NULL; | |
771 | ||
772 | #ifdef CONFIG_JOLIET | |
773 | if (joliet_level && opt.utf8 == 0) { | |
774 | char * p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; | |
775 | sbi->s_nls_iocharset = load_nls(p); | |
776 | if (! sbi->s_nls_iocharset) { | |
777 | /* Fail only if explicit charset specified */ | |
778 | if (opt.iocharset) | |
779 | goto out_freesbi; | |
780 | sbi->s_nls_iocharset = load_nls_default(); | |
781 | } | |
782 | } | |
783 | #endif | |
784 | s->s_op = &isofs_sops; | |
785 | s->s_export_op = &isofs_export_ops; | |
786 | sbi->s_mapping = opt.map; | |
787 | sbi->s_rock = (opt.rock == 'y' ? 2 : 0); | |
788 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ | |
789 | sbi->s_cruft = opt.cruft; | |
9769f4eb JW |
790 | sbi->s_hide = opt.hide; |
791 | sbi->s_showassoc = opt.showassoc; | |
1da177e4 LT |
792 | sbi->s_uid = opt.uid; |
793 | sbi->s_gid = opt.gid; | |
794 | sbi->s_utf8 = opt.utf8; | |
795 | sbi->s_nocompress = opt.nocompress; | |
796 | /* | |
797 | * It would be incredibly stupid to allow people to mark every file | |
798 | * on the disk as suid, so we merely allow them to set the default | |
799 | * permissions. | |
800 | */ | |
801 | sbi->s_mode = opt.mode & 0777; | |
802 | ||
803 | /* | |
804 | * Read the root inode, which _may_ result in changing | |
805 | * the s_rock flag. Once we have the final s_rock value, | |
806 | * we then decide whether to use the Joliet descriptor. | |
807 | */ | |
808 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
809 | ||
810 | /* | |
811 | * If this disk has both Rock Ridge and Joliet on it, then we | |
812 | * want to use Rock Ridge by default. This can be overridden | |
813 | * by using the norock mount option. There is still one other | |
814 | * possibility that is not taken into account: a Rock Ridge | |
815 | * CD with Unicode names. Until someone sees such a beast, it | |
816 | * will not be supported. | |
817 | */ | |
818 | if (sbi->s_rock == 1) { | |
819 | joliet_level = 0; | |
820 | } else if (joliet_level) { | |
821 | sbi->s_rock = 0; | |
822 | if (sbi->s_firstdatazone != first_data_zone) { | |
823 | sbi->s_firstdatazone = first_data_zone; | |
824 | printk(KERN_DEBUG | |
825 | "ISOFS: changing to secondary root\n"); | |
826 | iput(inode); | |
827 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
828 | } | |
829 | } | |
830 | ||
831 | if (opt.check == 'u') { | |
832 | /* Only Joliet is case insensitive by default */ | |
833 | if (joliet_level) opt.check = 'r'; | |
834 | else opt.check = 's'; | |
835 | } | |
836 | sbi->s_joliet_level = joliet_level; | |
837 | ||
838 | /* check the root inode */ | |
839 | if (!inode) | |
840 | goto out_no_root; | |
841 | if (!inode->i_op) | |
842 | goto out_bad_root; | |
843 | /* get the root dentry */ | |
844 | s->s_root = d_alloc_root(inode); | |
845 | if (!(s->s_root)) | |
846 | goto out_no_root; | |
847 | ||
848 | table = 0; | |
849 | if (joliet_level) table += 2; | |
850 | if (opt.check == 'r') table++; | |
851 | s->s_root->d_op = &isofs_dentry_ops[table]; | |
852 | ||
f99d49ad | 853 | kfree(opt.iocharset); |
1da177e4 LT |
854 | |
855 | return 0; | |
856 | ||
857 | /* | |
858 | * Display error messages and free resources. | |
859 | */ | |
860 | out_bad_root: | |
861 | printk(KERN_WARNING "isofs_fill_super: root inode not initialized\n"); | |
862 | goto out_iput; | |
863 | out_no_root: | |
864 | printk(KERN_WARNING "isofs_fill_super: get root inode failed\n"); | |
865 | out_iput: | |
866 | iput(inode); | |
867 | #ifdef CONFIG_JOLIET | |
868 | if (sbi->s_nls_iocharset) | |
869 | unload_nls(sbi->s_nls_iocharset); | |
870 | #endif | |
871 | goto out_freesbi; | |
872 | out_no_read: | |
873 | printk(KERN_WARNING "isofs_fill_super: " | |
874 | "bread failed, dev=%s, iso_blknum=%d, block=%d\n", | |
875 | s->s_id, iso_blknum, block); | |
876 | goto out_freesbi; | |
877 | out_bad_zone_size: | |
878 | printk(KERN_WARNING "Bad logical zone size %ld\n", | |
879 | sbi->s_log_zone_size); | |
880 | goto out_freebh; | |
881 | out_bad_size: | |
882 | printk(KERN_WARNING "Logical zone size(%d) < hardware blocksize(%u)\n", | |
883 | orig_zonesize, opt.blocksize); | |
884 | goto out_freebh; | |
885 | out_unknown_format: | |
886 | if (!silent) | |
887 | printk(KERN_WARNING "Unable to identify CD-ROM format.\n"); | |
888 | ||
889 | out_freebh: | |
890 | brelse(bh); | |
891 | out_freesbi: | |
f99d49ad | 892 | kfree(opt.iocharset); |
1da177e4 LT |
893 | kfree(sbi); |
894 | s->s_fs_info = NULL; | |
895 | return -EINVAL; | |
896 | } | |
897 | ||
726c3342 | 898 | static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 899 | { |
726c3342 DH |
900 | struct super_block *sb = dentry->d_sb; |
901 | ||
1da177e4 LT |
902 | buf->f_type = ISOFS_SUPER_MAGIC; |
903 | buf->f_bsize = sb->s_blocksize; | |
904 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones | |
905 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); | |
906 | buf->f_bfree = 0; | |
907 | buf->f_bavail = 0; | |
908 | buf->f_files = ISOFS_SB(sb)->s_ninodes; | |
909 | buf->f_ffree = 0; | |
910 | buf->f_namelen = NAME_MAX; | |
911 | return 0; | |
912 | } | |
913 | ||
914 | /* | |
915 | * Get a set of blocks; filling in buffer_heads if already allocated | |
916 | * or getblk() if they are not. Returns the number of blocks inserted | |
917 | * (0 == error.) | |
918 | */ | |
919 | int isofs_get_blocks(struct inode *inode, sector_t iblock_s, | |
920 | struct buffer_head **bh, unsigned long nblocks) | |
921 | { | |
922 | unsigned long b_off; | |
923 | unsigned offset, sect_size; | |
924 | unsigned int firstext; | |
925 | unsigned long nextblk, nextoff; | |
926 | long iblock = (long)iblock_s; | |
927 | int section, rv; | |
928 | struct iso_inode_info *ei = ISOFS_I(inode); | |
929 | ||
930 | lock_kernel(); | |
931 | ||
932 | rv = 0; | |
933 | if (iblock < 0 || iblock != iblock_s) { | |
934 | printk("isofs_get_blocks: block number too large\n"); | |
935 | goto abort; | |
936 | } | |
937 | ||
938 | b_off = iblock; | |
939 | ||
940 | offset = 0; | |
941 | firstext = ei->i_first_extent; | |
942 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); | |
943 | nextblk = ei->i_next_section_block; | |
944 | nextoff = ei->i_next_section_offset; | |
945 | section = 0; | |
946 | ||
947 | while ( nblocks ) { | |
948 | /* If we are *way* beyond the end of the file, print a message. | |
949 | * Access beyond the end of the file up to the next page boundary | |
950 | * is normal, however because of the way the page cache works. | |
951 | * In this case, we just return 0 so that we can properly fill | |
952 | * the page with useless information without generating any | |
953 | * I/O errors. | |
954 | */ | |
955 | if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { | |
956 | printk("isofs_get_blocks: block >= EOF (%ld, %ld)\n", | |
957 | iblock, (unsigned long) inode->i_size); | |
958 | goto abort; | |
959 | } | |
960 | ||
fb50ae74 JRV |
961 | /* On the last section, nextblk == 0, section size is likely to |
962 | * exceed sect_size by a partial block, and access beyond the | |
963 | * end of the file will reach beyond the section size, too. | |
964 | */ | |
965 | while (nextblk && (b_off >= (offset + sect_size))) { | |
966 | struct inode *ninode; | |
967 | ||
968 | offset += sect_size; | |
969 | ninode = isofs_iget(inode->i_sb, nextblk, nextoff); | |
970 | if (!ninode) | |
971 | goto abort; | |
972 | firstext = ISOFS_I(ninode)->i_first_extent; | |
973 | sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); | |
974 | nextblk = ISOFS_I(ninode)->i_next_section_block; | |
975 | nextoff = ISOFS_I(ninode)->i_next_section_offset; | |
976 | iput(ninode); | |
977 | ||
978 | if (++section > 100) { | |
979 | printk("isofs_get_blocks: More than 100 file sections ?!?, aborting...\n"); | |
980 | printk("isofs_get_blocks: block=%ld firstext=%u sect_size=%u " | |
981 | "nextblk=%lu nextoff=%lu\n", | |
982 | iblock, firstext, (unsigned) sect_size, | |
983 | nextblk, nextoff); | |
984 | goto abort; | |
1da177e4 LT |
985 | } |
986 | } | |
987 | ||
988 | if ( *bh ) { | |
989 | map_bh(*bh, inode->i_sb, firstext + b_off - offset); | |
990 | } else { | |
991 | *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); | |
992 | if ( !*bh ) | |
993 | goto abort; | |
994 | } | |
995 | bh++; /* Next buffer head */ | |
996 | b_off++; /* Next buffer offset */ | |
997 | nblocks--; | |
998 | rv++; | |
999 | } | |
1000 | ||
1da177e4 LT |
1001 | abort: |
1002 | unlock_kernel(); | |
1003 | return rv; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Used by the standard interfaces. | |
1008 | */ | |
1009 | static int isofs_get_block(struct inode *inode, sector_t iblock, | |
1010 | struct buffer_head *bh_result, int create) | |
1011 | { | |
9eb7f2c6 | 1012 | if (create) { |
1da177e4 LT |
1013 | printk("isofs_get_block: Kernel tries to allocate a block\n"); |
1014 | return -EROFS; | |
1015 | } | |
1016 | ||
1017 | return isofs_get_blocks(inode, iblock, &bh_result, 1) ? 0 : -EIO; | |
1018 | } | |
1019 | ||
1020 | static int isofs_bmap(struct inode *inode, sector_t block) | |
1021 | { | |
1022 | struct buffer_head dummy; | |
1023 | int error; | |
1024 | ||
1025 | dummy.b_state = 0; | |
1026 | dummy.b_blocknr = -1000; | |
1027 | error = isofs_get_block(inode, block, &dummy, 0); | |
1028 | if (!error) | |
1029 | return dummy.b_blocknr; | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) | |
1034 | { | |
1035 | sector_t blknr = isofs_bmap(inode, block); | |
1036 | if (!blknr) | |
1037 | return NULL; | |
1038 | return sb_bread(inode->i_sb, blknr); | |
1039 | } | |
1040 | ||
1041 | static int isofs_readpage(struct file *file, struct page *page) | |
1042 | { | |
1043 | return block_read_full_page(page,isofs_get_block); | |
1044 | } | |
1045 | ||
1046 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) | |
1047 | { | |
1048 | return generic_block_bmap(mapping,block,isofs_get_block); | |
1049 | } | |
1050 | ||
f5e54d6e | 1051 | static const struct address_space_operations isofs_aops = { |
1da177e4 LT |
1052 | .readpage = isofs_readpage, |
1053 | .sync_page = block_sync_page, | |
1054 | .bmap = _isofs_bmap | |
1055 | }; | |
1056 | ||
1057 | static inline void test_and_set_uid(uid_t *p, uid_t value) | |
1058 | { | |
9eb7f2c6 | 1059 | if (value) |
1da177e4 | 1060 | *p = value; |
1da177e4 LT |
1061 | } |
1062 | ||
1063 | static inline void test_and_set_gid(gid_t *p, gid_t value) | |
1064 | { | |
9eb7f2c6 | 1065 | if (value) |
1da177e4 | 1066 | *p = value; |
1da177e4 LT |
1067 | } |
1068 | ||
9eb7f2c6 | 1069 | static int isofs_read_level3_size(struct inode *inode) |
1da177e4 LT |
1070 | { |
1071 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1072 | int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; | |
1073 | struct buffer_head * bh = NULL; | |
1074 | unsigned long block, offset, block_saved, offset_saved; | |
1075 | int i = 0; | |
1076 | int more_entries = 0; | |
1077 | struct iso_directory_record * tmpde = NULL; | |
1078 | struct iso_inode_info *ei = ISOFS_I(inode); | |
1079 | ||
1080 | inode->i_size = 0; | |
1081 | ||
1082 | /* The first 16 blocks are reserved as the System Area. Thus, | |
1083 | * no inodes can appear in block 0. We use this to flag that | |
1084 | * this is the last section. */ | |
1085 | ei->i_next_section_block = 0; | |
1086 | ei->i_next_section_offset = 0; | |
1087 | ||
1088 | block = ei->i_iget5_block; | |
1089 | offset = ei->i_iget5_offset; | |
1090 | ||
1091 | do { | |
1092 | struct iso_directory_record * de; | |
1093 | unsigned int de_len; | |
1094 | ||
1095 | if (!bh) { | |
1096 | bh = sb_bread(inode->i_sb, block); | |
1097 | if (!bh) | |
1098 | goto out_noread; | |
1099 | } | |
1100 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1101 | de_len = *(unsigned char *) de; | |
1102 | ||
1103 | if (de_len == 0) { | |
1104 | brelse(bh); | |
1105 | bh = NULL; | |
1106 | ++block; | |
1107 | offset = 0; | |
1108 | continue; | |
1109 | } | |
1110 | ||
1111 | block_saved = block; | |
1112 | offset_saved = offset; | |
1113 | offset += de_len; | |
1114 | ||
1115 | /* Make sure we have a full directory entry */ | |
1116 | if (offset >= bufsize) { | |
1117 | int slop = bufsize - offset + de_len; | |
1118 | if (!tmpde) { | |
1119 | tmpde = kmalloc(256, GFP_KERNEL); | |
1120 | if (!tmpde) | |
1121 | goto out_nomem; | |
1122 | } | |
1123 | memcpy(tmpde, de, slop); | |
1124 | offset &= bufsize - 1; | |
1125 | block++; | |
1126 | brelse(bh); | |
1127 | bh = NULL; | |
1128 | if (offset) { | |
1129 | bh = sb_bread(inode->i_sb, block); | |
1130 | if (!bh) | |
1131 | goto out_noread; | |
9eb7f2c6 | 1132 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
1da177e4 LT |
1133 | } |
1134 | de = tmpde; | |
1135 | } | |
1136 | ||
1137 | inode->i_size += isonum_733(de->size); | |
1138 | if (i == 1) { | |
1139 | ei->i_next_section_block = block_saved; | |
1140 | ei->i_next_section_offset = offset_saved; | |
1141 | } | |
1142 | ||
1143 | more_entries = de->flags[-high_sierra] & 0x80; | |
1144 | ||
1145 | i++; | |
9eb7f2c6 | 1146 | if (i > 100) |
1da177e4 | 1147 | goto out_toomany; |
9eb7f2c6 | 1148 | } while (more_entries); |
1da177e4 | 1149 | out: |
9eb7f2c6 | 1150 | kfree(tmpde); |
1da177e4 LT |
1151 | if (bh) |
1152 | brelse(bh); | |
1153 | return 0; | |
1154 | ||
1155 | out_nomem: | |
1156 | if (bh) | |
1157 | brelse(bh); | |
1158 | return -ENOMEM; | |
1159 | ||
1160 | out_noread: | |
1161 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); | |
f99d49ad | 1162 | kfree(tmpde); |
1da177e4 LT |
1163 | return -EIO; |
1164 | ||
1165 | out_toomany: | |
1166 | printk(KERN_INFO "isofs_read_level3_size: " | |
1167 | "More than 100 file sections ?!?, aborting...\n" | |
1168 | "isofs_read_level3_size: inode=%lu\n", | |
1169 | inode->i_ino); | |
1170 | goto out; | |
1171 | } | |
1172 | ||
9eb7f2c6 | 1173 | static void isofs_read_inode(struct inode *inode) |
1da177e4 LT |
1174 | { |
1175 | struct super_block *sb = inode->i_sb; | |
1176 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
1177 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1178 | unsigned long block; | |
1179 | int high_sierra = sbi->s_high_sierra; | |
1180 | struct buffer_head * bh = NULL; | |
1181 | struct iso_directory_record * de; | |
1182 | struct iso_directory_record * tmpde = NULL; | |
1183 | unsigned int de_len; | |
1184 | unsigned long offset; | |
1185 | struct iso_inode_info *ei = ISOFS_I(inode); | |
1186 | ||
1187 | block = ei->i_iget5_block; | |
1188 | bh = sb_bread(inode->i_sb, block); | |
1189 | if (!bh) | |
1190 | goto out_badread; | |
1191 | ||
1192 | offset = ei->i_iget5_offset; | |
1193 | ||
1194 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1195 | de_len = *(unsigned char *) de; | |
1196 | ||
1197 | if (offset + de_len > bufsize) { | |
1198 | int frag1 = bufsize - offset; | |
1199 | ||
1200 | tmpde = kmalloc(de_len, GFP_KERNEL); | |
1201 | if (tmpde == NULL) { | |
1202 | printk(KERN_INFO "isofs_read_inode: out of memory\n"); | |
1203 | goto fail; | |
1204 | } | |
1205 | memcpy(tmpde, bh->b_data + offset, frag1); | |
1206 | brelse(bh); | |
1207 | bh = sb_bread(inode->i_sb, ++block); | |
1208 | if (!bh) | |
1209 | goto out_badread; | |
1210 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); | |
1211 | de = tmpde; | |
1212 | } | |
1213 | ||
1214 | inode->i_ino = isofs_get_ino(ei->i_iget5_block, | |
1215 | ei->i_iget5_offset, | |
1216 | ISOFS_BUFFER_BITS(inode)); | |
1217 | ||
1218 | /* Assume it is a normal-format file unless told otherwise */ | |
1219 | ei->i_file_format = isofs_file_normal; | |
1220 | ||
1221 | if (de->flags[-high_sierra] & 2) { | |
1222 | inode->i_mode = S_IRUGO | S_IXUGO | S_IFDIR; | |
1223 | inode->i_nlink = 1; /* Set to 1. We know there are 2, but | |
1224 | the find utility tries to optimize | |
1225 | if it is 2, and it screws up. It is | |
1226 | easier to give 1 which tells find to | |
1227 | do it the hard way. */ | |
1228 | } else { | |
1229 | /* Everybody gets to read the file. */ | |
1230 | inode->i_mode = sbi->s_mode; | |
1231 | inode->i_nlink = 1; | |
1232 | inode->i_mode |= S_IFREG; | |
1233 | } | |
1234 | inode->i_uid = sbi->s_uid; | |
1235 | inode->i_gid = sbi->s_gid; | |
ba52de12 | 1236 | inode->i_blocks = 0; |
1da177e4 LT |
1237 | |
1238 | ei->i_format_parm[0] = 0; | |
1239 | ei->i_format_parm[1] = 0; | |
1240 | ei->i_format_parm[2] = 0; | |
1241 | ||
1242 | ei->i_section_size = isonum_733 (de->size); | |
9eb7f2c6 | 1243 | if (de->flags[-high_sierra] & 0x80) { |
1da177e4 LT |
1244 | if(isofs_read_level3_size(inode)) goto fail; |
1245 | } else { | |
1246 | ei->i_next_section_block = 0; | |
1247 | ei->i_next_section_offset = 0; | |
1248 | inode->i_size = isonum_733 (de->size); | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | * Some dipshit decided to store some other bit of information | |
1253 | * in the high byte of the file length. Truncate size in case | |
1254 | * this CDROM was mounted with the cruft option. | |
1255 | */ | |
1256 | ||
1257 | if (sbi->s_cruft == 'y') | |
1258 | inode->i_size &= 0x00ffffff; | |
1259 | ||
1260 | if (de->interleave[0]) { | |
1261 | printk("Interleaved files not (yet) supported.\n"); | |
1262 | inode->i_size = 0; | |
1263 | } | |
1264 | ||
1265 | /* I have no idea what file_unit_size is used for, so | |
1266 | we will flag it for now */ | |
1267 | if (de->file_unit_size[0] != 0) { | |
1268 | printk("File unit size != 0 for ISO file (%ld).\n", | |
1269 | inode->i_ino); | |
1270 | } | |
1271 | ||
1272 | /* I have no idea what other flag bits are used for, so | |
1273 | we will flag it for now */ | |
1274 | #ifdef DEBUG | |
1275 | if((de->flags[-high_sierra] & ~2)!= 0){ | |
1276 | printk("Unusual flag settings for ISO file (%ld %x).\n", | |
1277 | inode->i_ino, de->flags[-high_sierra]); | |
1278 | } | |
1279 | #endif | |
1280 | ||
1281 | inode->i_mtime.tv_sec = | |
1282 | inode->i_atime.tv_sec = | |
1283 | inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); | |
1284 | inode->i_mtime.tv_nsec = | |
1285 | inode->i_atime.tv_nsec = | |
1286 | inode->i_ctime.tv_nsec = 0; | |
1287 | ||
1288 | ei->i_first_extent = (isonum_733 (de->extent) + | |
1289 | isonum_711 (de->ext_attr_length)); | |
1290 | ||
1291 | /* Set the number of blocks for stat() - should be done before RR */ | |
1da177e4 LT |
1292 | inode->i_blocks = (inode->i_size + 511) >> 9; |
1293 | ||
1294 | /* | |
1295 | * Now test for possible Rock Ridge extensions which will override | |
1296 | * some of these numbers in the inode structure. | |
1297 | */ | |
1298 | ||
1299 | if (!high_sierra) { | |
1300 | parse_rock_ridge_inode(de, inode); | |
1301 | /* if we want uid/gid set, override the rock ridge setting */ | |
1302 | test_and_set_uid(&inode->i_uid, sbi->s_uid); | |
1303 | test_and_set_gid(&inode->i_gid, sbi->s_gid); | |
1304 | } | |
1305 | ||
1306 | /* Install the inode operations vector */ | |
1307 | if (S_ISREG(inode->i_mode)) { | |
1308 | inode->i_fop = &generic_ro_fops; | |
1309 | switch ( ei->i_file_format ) { | |
1310 | #ifdef CONFIG_ZISOFS | |
1311 | case isofs_file_compressed: | |
1312 | inode->i_data.a_ops = &zisofs_aops; | |
1313 | break; | |
1314 | #endif | |
1315 | default: | |
1316 | inode->i_data.a_ops = &isofs_aops; | |
1317 | break; | |
1318 | } | |
1319 | } else if (S_ISDIR(inode->i_mode)) { | |
1320 | inode->i_op = &isofs_dir_inode_operations; | |
1321 | inode->i_fop = &isofs_dir_operations; | |
1322 | } else if (S_ISLNK(inode->i_mode)) { | |
1323 | inode->i_op = &page_symlink_inode_operations; | |
1324 | inode->i_data.a_ops = &isofs_symlink_aops; | |
1325 | } else | |
1326 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ | |
1327 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1328 | ||
9eb7f2c6 | 1329 | out: |
f99d49ad | 1330 | kfree(tmpde); |
1da177e4 LT |
1331 | if (bh) |
1332 | brelse(bh); | |
1333 | return; | |
1334 | ||
9eb7f2c6 | 1335 | out_badread: |
1da177e4 | 1336 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); |
9eb7f2c6 | 1337 | fail: |
1da177e4 LT |
1338 | make_bad_inode(inode); |
1339 | goto out; | |
1340 | } | |
1341 | ||
1342 | struct isofs_iget5_callback_data { | |
1343 | unsigned long block; | |
1344 | unsigned long offset; | |
1345 | }; | |
1346 | ||
1347 | static int isofs_iget5_test(struct inode *ino, void *data) | |
1348 | { | |
1349 | struct iso_inode_info *i = ISOFS_I(ino); | |
1350 | struct isofs_iget5_callback_data *d = | |
1351 | (struct isofs_iget5_callback_data*)data; | |
1352 | return (i->i_iget5_block == d->block) | |
1353 | && (i->i_iget5_offset == d->offset); | |
1354 | } | |
1355 | ||
1356 | static int isofs_iget5_set(struct inode *ino, void *data) | |
1357 | { | |
1358 | struct iso_inode_info *i = ISOFS_I(ino); | |
1359 | struct isofs_iget5_callback_data *d = | |
1360 | (struct isofs_iget5_callback_data*)data; | |
1361 | i->i_iget5_block = d->block; | |
1362 | i->i_iget5_offset = d->offset; | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | /* Store, in the inode's containing structure, the block and block | |
1367 | * offset that point to the underlying meta-data for the inode. The | |
1368 | * code below is otherwise similar to the iget() code in | |
1369 | * include/linux/fs.h */ | |
1370 | struct inode *isofs_iget(struct super_block *sb, | |
1371 | unsigned long block, | |
1372 | unsigned long offset) | |
1373 | { | |
1374 | unsigned long hashval; | |
1375 | struct inode *inode; | |
1376 | struct isofs_iget5_callback_data data; | |
1377 | ||
1378 | if (offset >= 1ul << sb->s_blocksize_bits) | |
1379 | return NULL; | |
1380 | ||
1381 | data.block = block; | |
1382 | data.offset = offset; | |
1383 | ||
1384 | hashval = (block << sb->s_blocksize_bits) | offset; | |
1385 | ||
9eb7f2c6 AM |
1386 | inode = iget5_locked(sb, hashval, &isofs_iget5_test, |
1387 | &isofs_iget5_set, &data); | |
1da177e4 LT |
1388 | |
1389 | if (inode && (inode->i_state & I_NEW)) { | |
1390 | sb->s_op->read_inode(inode); | |
1391 | unlock_new_inode(inode); | |
1392 | } | |
1393 | ||
1394 | return inode; | |
1395 | } | |
1396 | ||
454e2398 DH |
1397 | static int isofs_get_sb(struct file_system_type *fs_type, |
1398 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 1399 | { |
454e2398 DH |
1400 | return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super, |
1401 | mnt); | |
1da177e4 LT |
1402 | } |
1403 | ||
1404 | static struct file_system_type iso9660_fs_type = { | |
1405 | .owner = THIS_MODULE, | |
1406 | .name = "iso9660", | |
1407 | .get_sb = isofs_get_sb, | |
1408 | .kill_sb = kill_block_super, | |
1409 | .fs_flags = FS_REQUIRES_DEV, | |
1410 | }; | |
1411 | ||
1412 | static int __init init_iso9660_fs(void) | |
1413 | { | |
1414 | int err = init_inodecache(); | |
1415 | if (err) | |
1416 | goto out; | |
1417 | #ifdef CONFIG_ZISOFS | |
1418 | err = zisofs_init(); | |
1419 | if (err) | |
1420 | goto out1; | |
1421 | #endif | |
1422 | err = register_filesystem(&iso9660_fs_type); | |
1423 | if (err) | |
1424 | goto out2; | |
1425 | return 0; | |
1426 | out2: | |
1427 | #ifdef CONFIG_ZISOFS | |
1428 | zisofs_cleanup(); | |
1429 | out1: | |
1430 | #endif | |
1431 | destroy_inodecache(); | |
1432 | out: | |
1433 | return err; | |
1434 | } | |
1435 | ||
1436 | static void __exit exit_iso9660_fs(void) | |
1437 | { | |
1438 | unregister_filesystem(&iso9660_fs_type); | |
1439 | #ifdef CONFIG_ZISOFS | |
1440 | zisofs_cleanup(); | |
1441 | #endif | |
1442 | destroy_inodecache(); | |
1443 | } | |
1444 | ||
1445 | module_init(init_iso9660_fs) | |
1446 | module_exit(exit_iso9660_fs) | |
1447 | MODULE_LICENSE("GPL"); | |
1448 | /* Actual filesystem name is iso9660, as requested in filesystems.c */ | |
1449 | MODULE_ALIAS("iso9660"); |