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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 | ||
14 | #include <linux/config.h> | |
94f2f715 | 15 | #include <linux/init.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | ||
1da177e4 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include <linux/nls.h> |
20 | #include <linux/ctype.h> | |
21 | #include <linux/smp_lock.h> | |
94f2f715 AV |
22 | #include <linux/statfs.h> |
23 | #include <linux/cdrom.h> | |
1da177e4 | 24 | #include <linux/parser.h> |
1da177e4 | 25 | |
94f2f715 | 26 | #include "isofs.h" |
1da177e4 LT |
27 | #include "zisofs.h" |
28 | ||
29 | #define BEQUIET | |
30 | ||
1da177e4 LT |
31 | static int isofs_hashi(struct dentry *parent, struct qstr *qstr); |
32 | static int isofs_hash(struct dentry *parent, struct qstr *qstr); | |
33 | static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b); | |
34 | static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b); | |
35 | ||
36 | #ifdef CONFIG_JOLIET | |
37 | static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr); | |
38 | static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr); | |
39 | static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b); | |
40 | static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b); | |
41 | #endif | |
42 | ||
43 | static void isofs_put_super(struct super_block *sb) | |
44 | { | |
45 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
46 | #ifdef CONFIG_JOLIET | |
47 | if (sbi->s_nls_iocharset) { | |
48 | unload_nls(sbi->s_nls_iocharset); | |
49 | sbi->s_nls_iocharset = NULL; | |
50 | } | |
51 | #endif | |
52 | ||
1da177e4 LT |
53 | kfree(sbi); |
54 | sb->s_fs_info = NULL; | |
55 | return; | |
56 | } | |
57 | ||
58 | static void isofs_read_inode(struct inode *); | |
59 | static int isofs_statfs (struct super_block *, struct kstatfs *); | |
60 | ||
61 | static kmem_cache_t *isofs_inode_cachep; | |
62 | ||
63 | static struct inode *isofs_alloc_inode(struct super_block *sb) | |
64 | { | |
65 | struct iso_inode_info *ei; | |
9eb7f2c6 | 66 | ei = kmem_cache_alloc(isofs_inode_cachep, SLAB_KERNEL); |
1da177e4 LT |
67 | if (!ei) |
68 | return NULL; | |
69 | return &ei->vfs_inode; | |
70 | } | |
71 | ||
72 | static void isofs_destroy_inode(struct inode *inode) | |
73 | { | |
74 | kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode)); | |
75 | } | |
76 | ||
9eb7f2c6 | 77 | static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags) |
1da177e4 | 78 | { |
9eb7f2c6 | 79 | struct iso_inode_info *ei = foo; |
1da177e4 LT |
80 | |
81 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
82 | SLAB_CTOR_CONSTRUCTOR) | |
83 | inode_init_once(&ei->vfs_inode); | |
84 | } | |
85 | ||
86 | static int init_inodecache(void) | |
87 | { | |
88 | isofs_inode_cachep = kmem_cache_create("isofs_inode_cache", | |
89 | sizeof(struct iso_inode_info), | |
fffb60f9 PJ |
90 | 0, (SLAB_RECLAIM_ACCOUNT| |
91 | SLAB_MEM_SPREAD), | |
1da177e4 LT |
92 | init_once, NULL); |
93 | if (isofs_inode_cachep == NULL) | |
94 | return -ENOMEM; | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static void destroy_inodecache(void) | |
99 | { | |
100 | if (kmem_cache_destroy(isofs_inode_cachep)) | |
9eb7f2c6 AM |
101 | printk(KERN_INFO "iso_inode_cache: not all structures were " |
102 | "freed\n"); | |
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 | ||
112 | static struct super_operations isofs_sops = { | |
113 | .alloc_inode = isofs_alloc_inode, | |
114 | .destroy_inode = isofs_destroy_inode, | |
115 | .read_inode = isofs_read_inode, | |
116 | .put_super = isofs_put_super, | |
117 | .statfs = isofs_statfs, | |
118 | .remount_fs = isofs_remount, | |
119 | }; | |
120 | ||
121 | ||
122 | static struct dentry_operations isofs_dentry_ops[] = { | |
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{ | |
144 | char map; | |
145 | char rock; | |
146 | char joliet; | |
147 | char cruft; | |
9769f4eb JW |
148 | char hide; |
149 | char showassoc; | |
1da177e4 LT |
150 | char nocompress; |
151 | unsigned char check; | |
152 | unsigned int blocksize; | |
153 | mode_t mode; | |
154 | gid_t gid; | |
155 | uid_t uid; | |
156 | char *iocharset; | |
157 | unsigned char utf8; | |
158 | /* LVE */ | |
159 | s32 session; | |
160 | s32 sbsector; | |
161 | }; | |
162 | ||
163 | /* | |
164 | * Compute the hash for the isofs name corresponding to the dentry. | |
165 | */ | |
166 | static int | |
167 | isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms) | |
168 | { | |
169 | const char *name; | |
170 | int len; | |
171 | ||
172 | len = qstr->len; | |
173 | name = qstr->name; | |
174 | if (ms) { | |
175 | while (len && name[len-1] == '.') | |
176 | len--; | |
177 | } | |
178 | ||
179 | qstr->hash = full_name_hash(name, len); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | /* | |
185 | * Compute the hash for the isofs name corresponding to the dentry. | |
186 | */ | |
187 | static int | |
188 | isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms) | |
189 | { | |
190 | const char *name; | |
191 | int len; | |
192 | char c; | |
193 | unsigned long hash; | |
194 | ||
195 | len = qstr->len; | |
196 | name = qstr->name; | |
197 | if (ms) { | |
198 | while (len && name[len-1] == '.') | |
199 | len--; | |
200 | } | |
201 | ||
202 | hash = init_name_hash(); | |
203 | while (len--) { | |
204 | c = tolower(*name++); | |
205 | hash = partial_name_hash(tolower(c), hash); | |
206 | } | |
207 | qstr->hash = end_name_hash(hash); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Case insensitive compare of two isofs names. | |
214 | */ | |
9eb7f2c6 AM |
215 | static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a, |
216 | struct qstr *b, int ms) | |
1da177e4 LT |
217 | { |
218 | int alen, blen; | |
219 | ||
220 | /* A filename cannot end in '.' or we treat it like it has none */ | |
221 | alen = a->len; | |
222 | blen = b->len; | |
223 | if (ms) { | |
224 | while (alen && a->name[alen-1] == '.') | |
225 | alen--; | |
226 | while (blen && b->name[blen-1] == '.') | |
227 | blen--; | |
228 | } | |
229 | if (alen == blen) { | |
230 | if (strnicmp(a->name, b->name, alen) == 0) | |
231 | return 0; | |
232 | } | |
233 | return 1; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Case sensitive compare of two isofs names. | |
238 | */ | |
9eb7f2c6 AM |
239 | static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a, |
240 | struct qstr *b, int ms) | |
1da177e4 LT |
241 | { |
242 | int alen, blen; | |
243 | ||
244 | /* A filename cannot end in '.' or we treat it like it has none */ | |
245 | alen = a->len; | |
246 | blen = b->len; | |
247 | if (ms) { | |
248 | while (alen && a->name[alen-1] == '.') | |
249 | alen--; | |
250 | while (blen && b->name[blen-1] == '.') | |
251 | blen--; | |
252 | } | |
253 | if (alen == blen) { | |
254 | if (strncmp(a->name, b->name, alen) == 0) | |
255 | return 0; | |
256 | } | |
257 | return 1; | |
258 | } | |
259 | ||
260 | static int | |
261 | isofs_hash(struct dentry *dentry, struct qstr *qstr) | |
262 | { | |
263 | return isofs_hash_common(dentry, qstr, 0); | |
264 | } | |
265 | ||
266 | static int | |
267 | isofs_hashi(struct dentry *dentry, struct qstr *qstr) | |
268 | { | |
269 | return isofs_hashi_common(dentry, qstr, 0); | |
270 | } | |
271 | ||
272 | static int | |
273 | isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
274 | { | |
275 | return isofs_dentry_cmp_common(dentry, a, b, 0); | |
276 | } | |
277 | ||
278 | static int | |
279 | isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
280 | { | |
281 | return isofs_dentry_cmpi_common(dentry, a, b, 0); | |
282 | } | |
283 | ||
284 | #ifdef CONFIG_JOLIET | |
285 | static int | |
286 | isofs_hash_ms(struct dentry *dentry, struct qstr *qstr) | |
287 | { | |
288 | return isofs_hash_common(dentry, qstr, 1); | |
289 | } | |
290 | ||
291 | static int | |
292 | isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr) | |
293 | { | |
294 | return isofs_hashi_common(dentry, qstr, 1); | |
295 | } | |
296 | ||
297 | static int | |
298 | isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
299 | { | |
300 | return isofs_dentry_cmp_common(dentry, a, b, 1); | |
301 | } | |
302 | ||
303 | static int | |
304 | isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b) | |
305 | { | |
306 | return isofs_dentry_cmpi_common(dentry, a, b, 1); | |
307 | } | |
308 | #endif | |
309 | ||
310 | enum { | |
311 | Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore, | |
312 | Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet, | |
313 | Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err, | |
9769f4eb | 314 | Opt_nocompress, Opt_hide, Opt_showassoc, |
1da177e4 LT |
315 | }; |
316 | ||
317 | static match_table_t tokens = { | |
318 | {Opt_norock, "norock"}, | |
319 | {Opt_nojoliet, "nojoliet"}, | |
320 | {Opt_unhide, "unhide"}, | |
9769f4eb JW |
321 | {Opt_hide, "hide"}, |
322 | {Opt_showassoc, "showassoc"}, | |
1da177e4 LT |
323 | {Opt_cruft, "cruft"}, |
324 | {Opt_utf8, "utf8"}, | |
325 | {Opt_iocharset, "iocharset=%s"}, | |
326 | {Opt_map_a, "map=acorn"}, | |
327 | {Opt_map_a, "map=a"}, | |
328 | {Opt_map_n, "map=normal"}, | |
329 | {Opt_map_n, "map=n"}, | |
330 | {Opt_map_o, "map=off"}, | |
331 | {Opt_map_o, "map=o"}, | |
332 | {Opt_session, "session=%u"}, | |
333 | {Opt_sb, "sbsector=%u"}, | |
334 | {Opt_check_r, "check=relaxed"}, | |
335 | {Opt_check_r, "check=r"}, | |
336 | {Opt_check_s, "check=strict"}, | |
337 | {Opt_check_s, "check=s"}, | |
338 | {Opt_uid, "uid=%u"}, | |
339 | {Opt_gid, "gid=%u"}, | |
340 | {Opt_mode, "mode=%u"}, | |
341 | {Opt_block, "block=%u"}, | |
342 | {Opt_ignore, "conv=binary"}, | |
343 | {Opt_ignore, "conv=b"}, | |
344 | {Opt_ignore, "conv=text"}, | |
345 | {Opt_ignore, "conv=t"}, | |
346 | {Opt_ignore, "conv=mtext"}, | |
347 | {Opt_ignore, "conv=m"}, | |
348 | {Opt_ignore, "conv=auto"}, | |
349 | {Opt_ignore, "conv=a"}, | |
350 | {Opt_nocompress, "nocompress"}, | |
351 | {Opt_err, NULL} | |
352 | }; | |
353 | ||
9eb7f2c6 | 354 | static int parse_options(char *options, struct iso9660_options *popt) |
1da177e4 LT |
355 | { |
356 | char *p; | |
357 | int option; | |
358 | ||
359 | popt->map = 'n'; | |
360 | popt->rock = 'y'; | |
361 | popt->joliet = 'y'; | |
362 | popt->cruft = 'n'; | |
9769f4eb JW |
363 | popt->hide = 'n'; |
364 | popt->showassoc = 'n'; | |
1da177e4 LT |
365 | popt->check = 'u'; /* unset */ |
366 | popt->nocompress = 0; | |
367 | popt->blocksize = 1024; | |
368 | popt->mode = S_IRUGO | S_IXUGO; /* r-x for all. The disc could | |
369 | be shared with DOS machines so | |
370 | virtually anything could be | |
371 | a valid executable. */ | |
372 | popt->gid = 0; | |
373 | popt->uid = 0; | |
374 | popt->iocharset = NULL; | |
375 | popt->utf8 = 0; | |
376 | popt->session=-1; | |
377 | popt->sbsector=-1; | |
378 | if (!options) | |
379 | return 1; | |
380 | ||
381 | while ((p = strsep(&options, ",")) != NULL) { | |
382 | int token; | |
383 | substring_t args[MAX_OPT_ARGS]; | |
384 | unsigned n; | |
385 | ||
386 | if (!*p) | |
387 | continue; | |
388 | ||
389 | token = match_token(p, tokens, args); | |
390 | switch (token) { | |
391 | case Opt_norock: | |
392 | popt->rock = 'n'; | |
393 | break; | |
394 | case Opt_nojoliet: | |
395 | popt->joliet = 'n'; | |
396 | break; | |
9769f4eb JW |
397 | case Opt_hide: |
398 | popt->hide = 'y'; | |
399 | break; | |
1da177e4 | 400 | case Opt_unhide: |
9769f4eb JW |
401 | case Opt_showassoc: |
402 | popt->showassoc = 'y'; | |
1da177e4 LT |
403 | break; |
404 | case Opt_cruft: | |
405 | popt->cruft = 'y'; | |
406 | break; | |
407 | case Opt_utf8: | |
408 | popt->utf8 = 1; | |
409 | break; | |
410 | #ifdef CONFIG_JOLIET | |
411 | case Opt_iocharset: | |
412 | popt->iocharset = match_strdup(&args[0]); | |
413 | break; | |
414 | #endif | |
415 | case Opt_map_a: | |
416 | popt->map = 'a'; | |
417 | break; | |
418 | case Opt_map_o: | |
419 | popt->map = 'o'; | |
420 | break; | |
421 | case Opt_map_n: | |
422 | popt->map = 'n'; | |
423 | break; | |
424 | case Opt_session: | |
425 | if (match_int(&args[0], &option)) | |
426 | return 0; | |
427 | n = option; | |
428 | if (n > 99) | |
429 | return 0; | |
430 | popt->session = n + 1; | |
431 | break; | |
432 | case Opt_sb: | |
433 | if (match_int(&args[0], &option)) | |
434 | return 0; | |
435 | popt->sbsector = option; | |
436 | break; | |
437 | case Opt_check_r: | |
438 | popt->check = 'r'; | |
439 | break; | |
440 | case Opt_check_s: | |
441 | popt->check = 's'; | |
442 | break; | |
443 | case Opt_ignore: | |
444 | break; | |
445 | case Opt_uid: | |
446 | if (match_int(&args[0], &option)) | |
447 | return 0; | |
448 | popt->uid = option; | |
449 | break; | |
450 | case Opt_gid: | |
451 | if (match_int(&args[0], &option)) | |
452 | return 0; | |
453 | popt->gid = option; | |
454 | break; | |
455 | case Opt_mode: | |
456 | if (match_int(&args[0], &option)) | |
457 | return 0; | |
458 | popt->mode = option; | |
459 | break; | |
460 | case Opt_block: | |
461 | if (match_int(&args[0], &option)) | |
462 | return 0; | |
463 | n = option; | |
464 | if (n != 512 && n != 1024 && n != 2048) | |
465 | return 0; | |
466 | popt->blocksize = n; | |
467 | break; | |
468 | case Opt_nocompress: | |
469 | popt->nocompress = 1; | |
470 | break; | |
471 | default: | |
472 | return 0; | |
473 | } | |
474 | } | |
475 | return 1; | |
476 | } | |
477 | ||
478 | /* | |
479 | * look if the driver can tell the multi session redirection value | |
480 | * | |
481 | * don't change this if you don't know what you do, please! | |
482 | * Multisession is legal only with XA disks. | |
483 | * A non-XA disk with more than one volume descriptor may do it right, but | |
484 | * usually is written in a nowhere standardized "multi-partition" manner. | |
485 | * Multisession uses absolute addressing (solely the first frame of the whole | |
486 | * track is #0), multi-partition uses relative addressing (each first frame of | |
487 | * each track is #0), and a track is not a session. | |
488 | * | |
489 | * A broken CDwriter software or drive firmware does not set new standards, | |
490 | * at least not if conflicting with the existing ones. | |
491 | * | |
492 | * emoenke@gwdg.de | |
493 | */ | |
494 | #define WE_OBEY_THE_WRITTEN_STANDARDS 1 | |
495 | ||
9eb7f2c6 | 496 | static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) |
1da177e4 LT |
497 | { |
498 | struct cdrom_multisession ms_info; | |
499 | unsigned int vol_desc_start; | |
500 | struct block_device *bdev = sb->s_bdev; | |
501 | int i; | |
502 | ||
503 | vol_desc_start=0; | |
504 | ms_info.addr_format=CDROM_LBA; | |
505 | if(session >= 0 && session <= 99) { | |
506 | struct cdrom_tocentry Te; | |
507 | Te.cdte_track=session; | |
508 | Te.cdte_format=CDROM_LBA; | |
509 | i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te); | |
510 | if (!i) { | |
511 | printk(KERN_DEBUG "Session %d start %d type %d\n", | |
512 | session, Te.cdte_addr.lba, | |
513 | Te.cdte_ctrl&CDROM_DATA_TRACK); | |
514 | if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4) | |
515 | return Te.cdte_addr.lba; | |
516 | } | |
517 | ||
518 | printk(KERN_ERR "Invalid session number or type of track\n"); | |
519 | } | |
520 | i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); | |
9eb7f2c6 AM |
521 | if (session > 0) |
522 | printk(KERN_ERR "Invalid session number\n"); | |
1da177e4 LT |
523 | #if 0 |
524 | printk("isofs.inode: CDROMMULTISESSION: rc=%d\n",i); | |
525 | if (i==0) { | |
526 | printk("isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no"); | |
527 | printk("isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba); | |
528 | } | |
529 | #endif | |
530 | if (i==0) | |
531 | #if WE_OBEY_THE_WRITTEN_STANDARDS | |
532 | if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ | |
533 | #endif | |
534 | vol_desc_start=ms_info.addr.lba; | |
535 | return vol_desc_start; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Initialize the superblock and read the root inode. | |
540 | * | |
541 | * Note: a check_disk_change() has been done immediately prior | |
542 | * to this call, so we don't need to check again. | |
543 | */ | |
544 | static int isofs_fill_super(struct super_block *s, void *data, int silent) | |
545 | { | |
546 | struct buffer_head * bh = NULL, *pri_bh = NULL; | |
547 | struct hs_primary_descriptor * h_pri = NULL; | |
548 | struct iso_primary_descriptor * pri = NULL; | |
549 | struct iso_supplementary_descriptor *sec = NULL; | |
550 | struct iso_directory_record * rootp; | |
551 | int joliet_level = 0; | |
552 | int iso_blknum, block; | |
553 | int orig_zonesize; | |
554 | int table; | |
555 | unsigned int vol_desc_start; | |
556 | unsigned long first_data_zone; | |
557 | struct inode * inode; | |
558 | struct iso9660_options opt; | |
559 | struct isofs_sb_info * sbi; | |
560 | ||
9eb7f2c6 | 561 | sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 LT |
562 | if (!sbi) |
563 | return -ENOMEM; | |
564 | s->s_fs_info = sbi; | |
9eb7f2c6 | 565 | memset(sbi, 0, sizeof(*sbi)); |
1da177e4 | 566 | |
9eb7f2c6 | 567 | if (!parse_options((char *)data, &opt)) |
1da177e4 LT |
568 | goto out_freesbi; |
569 | ||
570 | /* | |
571 | * First of all, get the hardware blocksize for this device. | |
572 | * If we don't know what it is, or the hardware blocksize is | |
573 | * larger than the blocksize the user specified, then use | |
574 | * that value. | |
575 | */ | |
576 | /* | |
577 | * What if bugger tells us to go beyond page size? | |
578 | */ | |
579 | opt.blocksize = sb_min_blocksize(s, opt.blocksize); | |
580 | ||
581 | sbi->s_high_sierra = 0; /* default is iso9660 */ | |
582 | ||
583 | vol_desc_start = (opt.sbsector != -1) ? | |
584 | opt.sbsector : isofs_get_last_session(s,opt.session); | |
585 | ||
586 | for (iso_blknum = vol_desc_start+16; | |
587 | iso_blknum < vol_desc_start+100; iso_blknum++) | |
588 | { | |
589 | struct hs_volume_descriptor * hdp; | |
590 | struct iso_volume_descriptor * vdp; | |
591 | ||
592 | block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits); | |
593 | if (!(bh = sb_bread(s, block))) | |
594 | goto out_no_read; | |
595 | ||
596 | vdp = (struct iso_volume_descriptor *)bh->b_data; | |
597 | hdp = (struct hs_volume_descriptor *)bh->b_data; | |
598 | ||
599 | /* Due to the overlapping physical location of the descriptors, | |
600 | * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure | |
601 | * proper identification in this case, we first check for ISO. | |
602 | */ | |
603 | if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) { | |
604 | if (isonum_711 (vdp->type) == ISO_VD_END) | |
605 | break; | |
606 | if (isonum_711 (vdp->type) == ISO_VD_PRIMARY) { | |
607 | if (pri == NULL) { | |
608 | pri = (struct iso_primary_descriptor *)vdp; | |
609 | /* Save the buffer in case we need it ... */ | |
610 | pri_bh = bh; | |
611 | bh = NULL; | |
612 | } | |
613 | } | |
614 | #ifdef CONFIG_JOLIET | |
615 | else if (isonum_711 (vdp->type) == ISO_VD_SUPPLEMENTARY) { | |
616 | sec = (struct iso_supplementary_descriptor *)vdp; | |
617 | if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) { | |
618 | if (opt.joliet == 'y') { | |
619 | if (sec->escape[2] == 0x40) { | |
620 | joliet_level = 1; | |
621 | } else if (sec->escape[2] == 0x43) { | |
622 | joliet_level = 2; | |
623 | } else if (sec->escape[2] == 0x45) { | |
624 | joliet_level = 3; | |
625 | } | |
626 | printk(KERN_DEBUG"ISO 9660 Extensions: Microsoft Joliet Level %d\n", | |
627 | joliet_level); | |
628 | } | |
629 | goto root_found; | |
630 | } else { | |
631 | /* Unknown supplementary volume descriptor */ | |
632 | sec = NULL; | |
633 | } | |
634 | } | |
635 | #endif | |
636 | } else { | |
637 | if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) { | |
638 | if (isonum_711 (hdp->type) != ISO_VD_PRIMARY) | |
639 | goto out_freebh; | |
640 | ||
641 | sbi->s_high_sierra = 1; | |
642 | opt.rock = 'n'; | |
643 | h_pri = (struct hs_primary_descriptor *)vdp; | |
644 | goto root_found; | |
645 | } | |
646 | } | |
647 | ||
648 | /* Just skip any volume descriptors we don't recognize */ | |
649 | ||
650 | brelse(bh); | |
651 | bh = NULL; | |
652 | } | |
653 | /* | |
654 | * If we fall through, either no volume descriptor was found, | |
655 | * or else we passed a primary descriptor looking for others. | |
656 | */ | |
657 | if (!pri) | |
658 | goto out_unknown_format; | |
659 | brelse(bh); | |
660 | bh = pri_bh; | |
661 | pri_bh = NULL; | |
662 | ||
663 | root_found: | |
664 | ||
665 | if (joliet_level && (pri == NULL || opt.rock == 'n')) { | |
666 | /* This is the case of Joliet with the norock mount flag. | |
667 | * A disc with both Joliet and Rock Ridge is handled later | |
668 | */ | |
669 | pri = (struct iso_primary_descriptor *) sec; | |
670 | } | |
671 | ||
672 | if(sbi->s_high_sierra){ | |
673 | rootp = (struct iso_directory_record *) h_pri->root_directory_record; | |
674 | sbi->s_nzones = isonum_733 (h_pri->volume_space_size); | |
675 | sbi->s_log_zone_size = isonum_723 (h_pri->logical_block_size); | |
676 | sbi->s_max_size = isonum_733(h_pri->volume_space_size); | |
677 | } else { | |
678 | if (!pri) | |
679 | goto out_freebh; | |
680 | rootp = (struct iso_directory_record *) pri->root_directory_record; | |
681 | sbi->s_nzones = isonum_733 (pri->volume_space_size); | |
682 | sbi->s_log_zone_size = isonum_723 (pri->logical_block_size); | |
683 | sbi->s_max_size = isonum_733(pri->volume_space_size); | |
684 | } | |
685 | ||
686 | sbi->s_ninodes = 0; /* No way to figure this out easily */ | |
687 | ||
688 | orig_zonesize = sbi->s_log_zone_size; | |
689 | /* | |
690 | * If the zone size is smaller than the hardware sector size, | |
691 | * this is a fatal error. This would occur if the disc drive | |
692 | * had sectors that were 2048 bytes, but the filesystem had | |
693 | * blocks that were 512 bytes (which should only very rarely | |
694 | * happen.) | |
695 | */ | |
696 | if(orig_zonesize < opt.blocksize) | |
697 | goto out_bad_size; | |
698 | ||
699 | /* RDE: convert log zone size to bit shift */ | |
700 | switch (sbi->s_log_zone_size) | |
701 | { case 512: sbi->s_log_zone_size = 9; break; | |
702 | case 1024: sbi->s_log_zone_size = 10; break; | |
703 | case 2048: sbi->s_log_zone_size = 11; break; | |
704 | ||
705 | default: | |
706 | goto out_bad_zone_size; | |
707 | } | |
708 | ||
709 | s->s_magic = ISOFS_SUPER_MAGIC; | |
710 | s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */ | |
711 | ||
712 | /* The CDROM is read-only, has no nodes (devices) on it, and since | |
713 | all of the files appear to be owned by root, we really do not want | |
714 | to allow suid. (suid or devices will not show up unless we have | |
715 | Rock Ridge extensions) */ | |
716 | ||
717 | s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; | |
718 | ||
719 | /* Set this for reference. Its not currently used except on write | |
720 | which we don't have .. */ | |
721 | ||
722 | first_data_zone = isonum_733 (rootp->extent) + | |
723 | isonum_711 (rootp->ext_attr_length); | |
724 | sbi->s_firstdatazone = first_data_zone; | |
725 | #ifndef BEQUIET | |
726 | printk(KERN_DEBUG "Max size:%ld Log zone size:%ld\n", | |
727 | sbi->s_max_size, | |
728 | 1UL << sbi->s_log_zone_size); | |
729 | printk(KERN_DEBUG "First datazone:%ld\n", sbi->s_firstdatazone); | |
730 | if(sbi->s_high_sierra) | |
731 | printk(KERN_DEBUG "Disc in High Sierra format.\n"); | |
732 | #endif | |
733 | ||
734 | /* | |
735 | * If the Joliet level is set, we _may_ decide to use the | |
736 | * secondary descriptor, but can't be sure until after we | |
737 | * read the root inode. But before reading the root inode | |
738 | * we may need to change the device blocksize, and would | |
739 | * rather release the old buffer first. So, we cache the | |
740 | * first_data_zone value from the secondary descriptor. | |
741 | */ | |
742 | if (joliet_level) { | |
743 | pri = (struct iso_primary_descriptor *) sec; | |
744 | rootp = (struct iso_directory_record *) | |
745 | pri->root_directory_record; | |
746 | first_data_zone = isonum_733 (rootp->extent) + | |
747 | isonum_711 (rootp->ext_attr_length); | |
748 | } | |
749 | ||
750 | /* | |
751 | * We're all done using the volume descriptor, and may need | |
752 | * to change the device blocksize, so release the buffer now. | |
753 | */ | |
754 | brelse(pri_bh); | |
755 | brelse(bh); | |
756 | ||
757 | /* | |
758 | * Force the blocksize to 512 for 512 byte sectors. The file | |
759 | * read primitives really get it wrong in a bad way if we don't | |
760 | * do this. | |
761 | * | |
762 | * Note - we should never be setting the blocksize to something | |
763 | * less than the hardware sector size for the device. If we | |
764 | * do, we would end up having to read larger buffers and split | |
765 | * out portions to satisfy requests. | |
766 | * | |
767 | * Note2- the idea here is that we want to deal with the optimal | |
768 | * zonesize in the filesystem. If we have it set to something less, | |
769 | * then we have horrible problems with trying to piece together | |
770 | * bits of adjacent blocks in order to properly read directory | |
771 | * entries. By forcing the blocksize in this way, we ensure | |
772 | * that we will never be required to do this. | |
773 | */ | |
774 | sb_set_blocksize(s, orig_zonesize); | |
775 | ||
776 | sbi->s_nls_iocharset = NULL; | |
777 | ||
778 | #ifdef CONFIG_JOLIET | |
779 | if (joliet_level && opt.utf8 == 0) { | |
780 | char * p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT; | |
781 | sbi->s_nls_iocharset = load_nls(p); | |
782 | if (! sbi->s_nls_iocharset) { | |
783 | /* Fail only if explicit charset specified */ | |
784 | if (opt.iocharset) | |
785 | goto out_freesbi; | |
786 | sbi->s_nls_iocharset = load_nls_default(); | |
787 | } | |
788 | } | |
789 | #endif | |
790 | s->s_op = &isofs_sops; | |
791 | s->s_export_op = &isofs_export_ops; | |
792 | sbi->s_mapping = opt.map; | |
793 | sbi->s_rock = (opt.rock == 'y' ? 2 : 0); | |
794 | sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/ | |
795 | sbi->s_cruft = opt.cruft; | |
9769f4eb JW |
796 | sbi->s_hide = opt.hide; |
797 | sbi->s_showassoc = opt.showassoc; | |
1da177e4 LT |
798 | sbi->s_uid = opt.uid; |
799 | sbi->s_gid = opt.gid; | |
800 | sbi->s_utf8 = opt.utf8; | |
801 | sbi->s_nocompress = opt.nocompress; | |
802 | /* | |
803 | * It would be incredibly stupid to allow people to mark every file | |
804 | * on the disk as suid, so we merely allow them to set the default | |
805 | * permissions. | |
806 | */ | |
807 | sbi->s_mode = opt.mode & 0777; | |
808 | ||
809 | /* | |
810 | * Read the root inode, which _may_ result in changing | |
811 | * the s_rock flag. Once we have the final s_rock value, | |
812 | * we then decide whether to use the Joliet descriptor. | |
813 | */ | |
814 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
815 | ||
816 | /* | |
817 | * If this disk has both Rock Ridge and Joliet on it, then we | |
818 | * want to use Rock Ridge by default. This can be overridden | |
819 | * by using the norock mount option. There is still one other | |
820 | * possibility that is not taken into account: a Rock Ridge | |
821 | * CD with Unicode names. Until someone sees such a beast, it | |
822 | * will not be supported. | |
823 | */ | |
824 | if (sbi->s_rock == 1) { | |
825 | joliet_level = 0; | |
826 | } else if (joliet_level) { | |
827 | sbi->s_rock = 0; | |
828 | if (sbi->s_firstdatazone != first_data_zone) { | |
829 | sbi->s_firstdatazone = first_data_zone; | |
830 | printk(KERN_DEBUG | |
831 | "ISOFS: changing to secondary root\n"); | |
832 | iput(inode); | |
833 | inode = isofs_iget(s, sbi->s_firstdatazone, 0); | |
834 | } | |
835 | } | |
836 | ||
837 | if (opt.check == 'u') { | |
838 | /* Only Joliet is case insensitive by default */ | |
839 | if (joliet_level) opt.check = 'r'; | |
840 | else opt.check = 's'; | |
841 | } | |
842 | sbi->s_joliet_level = joliet_level; | |
843 | ||
844 | /* check the root inode */ | |
845 | if (!inode) | |
846 | goto out_no_root; | |
847 | if (!inode->i_op) | |
848 | goto out_bad_root; | |
849 | /* get the root dentry */ | |
850 | s->s_root = d_alloc_root(inode); | |
851 | if (!(s->s_root)) | |
852 | goto out_no_root; | |
853 | ||
854 | table = 0; | |
855 | if (joliet_level) table += 2; | |
856 | if (opt.check == 'r') table++; | |
857 | s->s_root->d_op = &isofs_dentry_ops[table]; | |
858 | ||
f99d49ad | 859 | kfree(opt.iocharset); |
1da177e4 LT |
860 | |
861 | return 0; | |
862 | ||
863 | /* | |
864 | * Display error messages and free resources. | |
865 | */ | |
866 | out_bad_root: | |
867 | printk(KERN_WARNING "isofs_fill_super: root inode not initialized\n"); | |
868 | goto out_iput; | |
869 | out_no_root: | |
870 | printk(KERN_WARNING "isofs_fill_super: get root inode failed\n"); | |
871 | out_iput: | |
872 | iput(inode); | |
873 | #ifdef CONFIG_JOLIET | |
874 | if (sbi->s_nls_iocharset) | |
875 | unload_nls(sbi->s_nls_iocharset); | |
876 | #endif | |
877 | goto out_freesbi; | |
878 | out_no_read: | |
879 | printk(KERN_WARNING "isofs_fill_super: " | |
880 | "bread failed, dev=%s, iso_blknum=%d, block=%d\n", | |
881 | s->s_id, iso_blknum, block); | |
882 | goto out_freesbi; | |
883 | out_bad_zone_size: | |
884 | printk(KERN_WARNING "Bad logical zone size %ld\n", | |
885 | sbi->s_log_zone_size); | |
886 | goto out_freebh; | |
887 | out_bad_size: | |
888 | printk(KERN_WARNING "Logical zone size(%d) < hardware blocksize(%u)\n", | |
889 | orig_zonesize, opt.blocksize); | |
890 | goto out_freebh; | |
891 | out_unknown_format: | |
892 | if (!silent) | |
893 | printk(KERN_WARNING "Unable to identify CD-ROM format.\n"); | |
894 | ||
895 | out_freebh: | |
896 | brelse(bh); | |
897 | out_freesbi: | |
f99d49ad | 898 | kfree(opt.iocharset); |
1da177e4 LT |
899 | kfree(sbi); |
900 | s->s_fs_info = NULL; | |
901 | return -EINVAL; | |
902 | } | |
903 | ||
904 | static int isofs_statfs (struct super_block *sb, struct kstatfs *buf) | |
905 | { | |
906 | buf->f_type = ISOFS_SUPER_MAGIC; | |
907 | buf->f_bsize = sb->s_blocksize; | |
908 | buf->f_blocks = (ISOFS_SB(sb)->s_nzones | |
909 | << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits)); | |
910 | buf->f_bfree = 0; | |
911 | buf->f_bavail = 0; | |
912 | buf->f_files = ISOFS_SB(sb)->s_ninodes; | |
913 | buf->f_ffree = 0; | |
914 | buf->f_namelen = NAME_MAX; | |
915 | return 0; | |
916 | } | |
917 | ||
918 | /* | |
919 | * Get a set of blocks; filling in buffer_heads if already allocated | |
920 | * or getblk() if they are not. Returns the number of blocks inserted | |
921 | * (0 == error.) | |
922 | */ | |
923 | int isofs_get_blocks(struct inode *inode, sector_t iblock_s, | |
924 | struct buffer_head **bh, unsigned long nblocks) | |
925 | { | |
926 | unsigned long b_off; | |
927 | unsigned offset, sect_size; | |
928 | unsigned int firstext; | |
929 | unsigned long nextblk, nextoff; | |
930 | long iblock = (long)iblock_s; | |
931 | int section, rv; | |
932 | struct iso_inode_info *ei = ISOFS_I(inode); | |
933 | ||
934 | lock_kernel(); | |
935 | ||
936 | rv = 0; | |
937 | if (iblock < 0 || iblock != iblock_s) { | |
938 | printk("isofs_get_blocks: block number too large\n"); | |
939 | goto abort; | |
940 | } | |
941 | ||
942 | b_off = iblock; | |
943 | ||
944 | offset = 0; | |
945 | firstext = ei->i_first_extent; | |
946 | sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode); | |
947 | nextblk = ei->i_next_section_block; | |
948 | nextoff = ei->i_next_section_offset; | |
949 | section = 0; | |
950 | ||
951 | while ( nblocks ) { | |
952 | /* If we are *way* beyond the end of the file, print a message. | |
953 | * Access beyond the end of the file up to the next page boundary | |
954 | * is normal, however because of the way the page cache works. | |
955 | * In this case, we just return 0 so that we can properly fill | |
956 | * the page with useless information without generating any | |
957 | * I/O errors. | |
958 | */ | |
959 | if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) { | |
960 | printk("isofs_get_blocks: block >= EOF (%ld, %ld)\n", | |
961 | iblock, (unsigned long) inode->i_size); | |
962 | goto abort; | |
963 | } | |
964 | ||
965 | if (nextblk) { | |
966 | while (b_off >= (offset + sect_size)) { | |
967 | struct inode *ninode; | |
968 | ||
969 | offset += sect_size; | |
970 | if (nextblk == 0) | |
971 | goto abort; | |
972 | ninode = isofs_iget(inode->i_sb, nextblk, nextoff); | |
973 | if (!ninode) | |
974 | goto abort; | |
975 | firstext = ISOFS_I(ninode)->i_first_extent; | |
976 | sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode); | |
977 | nextblk = ISOFS_I(ninode)->i_next_section_block; | |
978 | nextoff = ISOFS_I(ninode)->i_next_section_offset; | |
979 | iput(ninode); | |
980 | ||
981 | if (++section > 100) { | |
982 | printk("isofs_get_blocks: More than 100 file sections ?!?, aborting...\n"); | |
983 | printk("isofs_get_blocks: block=%ld firstext=%u sect_size=%u " | |
984 | "nextblk=%lu nextoff=%lu\n", | |
985 | iblock, firstext, (unsigned) sect_size, | |
986 | nextblk, nextoff); | |
987 | goto abort; | |
988 | } | |
989 | } | |
990 | } | |
991 | ||
992 | if ( *bh ) { | |
993 | map_bh(*bh, inode->i_sb, firstext + b_off - offset); | |
994 | } else { | |
995 | *bh = sb_getblk(inode->i_sb, firstext+b_off-offset); | |
996 | if ( !*bh ) | |
997 | goto abort; | |
998 | } | |
999 | bh++; /* Next buffer head */ | |
1000 | b_off++; /* Next buffer offset */ | |
1001 | nblocks--; | |
1002 | rv++; | |
1003 | } | |
1004 | ||
1da177e4 LT |
1005 | abort: |
1006 | unlock_kernel(); | |
1007 | return rv; | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Used by the standard interfaces. | |
1012 | */ | |
1013 | static int isofs_get_block(struct inode *inode, sector_t iblock, | |
1014 | struct buffer_head *bh_result, int create) | |
1015 | { | |
9eb7f2c6 | 1016 | if (create) { |
1da177e4 LT |
1017 | printk("isofs_get_block: Kernel tries to allocate a block\n"); |
1018 | return -EROFS; | |
1019 | } | |
1020 | ||
1021 | return isofs_get_blocks(inode, iblock, &bh_result, 1) ? 0 : -EIO; | |
1022 | } | |
1023 | ||
1024 | static int isofs_bmap(struct inode *inode, sector_t block) | |
1025 | { | |
1026 | struct buffer_head dummy; | |
1027 | int error; | |
1028 | ||
1029 | dummy.b_state = 0; | |
1030 | dummy.b_blocknr = -1000; | |
1031 | error = isofs_get_block(inode, block, &dummy, 0); | |
1032 | if (!error) | |
1033 | return dummy.b_blocknr; | |
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | struct buffer_head *isofs_bread(struct inode *inode, sector_t block) | |
1038 | { | |
1039 | sector_t blknr = isofs_bmap(inode, block); | |
1040 | if (!blknr) | |
1041 | return NULL; | |
1042 | return sb_bread(inode->i_sb, blknr); | |
1043 | } | |
1044 | ||
1045 | static int isofs_readpage(struct file *file, struct page *page) | |
1046 | { | |
1047 | return block_read_full_page(page,isofs_get_block); | |
1048 | } | |
1049 | ||
1050 | static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) | |
1051 | { | |
1052 | return generic_block_bmap(mapping,block,isofs_get_block); | |
1053 | } | |
1054 | ||
1055 | static struct address_space_operations isofs_aops = { | |
1056 | .readpage = isofs_readpage, | |
1057 | .sync_page = block_sync_page, | |
1058 | .bmap = _isofs_bmap | |
1059 | }; | |
1060 | ||
1061 | static inline void test_and_set_uid(uid_t *p, uid_t value) | |
1062 | { | |
9eb7f2c6 | 1063 | if (value) |
1da177e4 | 1064 | *p = value; |
1da177e4 LT |
1065 | } |
1066 | ||
1067 | static inline void test_and_set_gid(gid_t *p, gid_t value) | |
1068 | { | |
9eb7f2c6 | 1069 | if (value) |
1da177e4 | 1070 | *p = value; |
1da177e4 LT |
1071 | } |
1072 | ||
9eb7f2c6 | 1073 | static int isofs_read_level3_size(struct inode *inode) |
1da177e4 LT |
1074 | { |
1075 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1076 | int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra; | |
1077 | struct buffer_head * bh = NULL; | |
1078 | unsigned long block, offset, block_saved, offset_saved; | |
1079 | int i = 0; | |
1080 | int more_entries = 0; | |
1081 | struct iso_directory_record * tmpde = NULL; | |
1082 | struct iso_inode_info *ei = ISOFS_I(inode); | |
1083 | ||
1084 | inode->i_size = 0; | |
1085 | ||
1086 | /* The first 16 blocks are reserved as the System Area. Thus, | |
1087 | * no inodes can appear in block 0. We use this to flag that | |
1088 | * this is the last section. */ | |
1089 | ei->i_next_section_block = 0; | |
1090 | ei->i_next_section_offset = 0; | |
1091 | ||
1092 | block = ei->i_iget5_block; | |
1093 | offset = ei->i_iget5_offset; | |
1094 | ||
1095 | do { | |
1096 | struct iso_directory_record * de; | |
1097 | unsigned int de_len; | |
1098 | ||
1099 | if (!bh) { | |
1100 | bh = sb_bread(inode->i_sb, block); | |
1101 | if (!bh) | |
1102 | goto out_noread; | |
1103 | } | |
1104 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1105 | de_len = *(unsigned char *) de; | |
1106 | ||
1107 | if (de_len == 0) { | |
1108 | brelse(bh); | |
1109 | bh = NULL; | |
1110 | ++block; | |
1111 | offset = 0; | |
1112 | continue; | |
1113 | } | |
1114 | ||
1115 | block_saved = block; | |
1116 | offset_saved = offset; | |
1117 | offset += de_len; | |
1118 | ||
1119 | /* Make sure we have a full directory entry */ | |
1120 | if (offset >= bufsize) { | |
1121 | int slop = bufsize - offset + de_len; | |
1122 | if (!tmpde) { | |
1123 | tmpde = kmalloc(256, GFP_KERNEL); | |
1124 | if (!tmpde) | |
1125 | goto out_nomem; | |
1126 | } | |
1127 | memcpy(tmpde, de, slop); | |
1128 | offset &= bufsize - 1; | |
1129 | block++; | |
1130 | brelse(bh); | |
1131 | bh = NULL; | |
1132 | if (offset) { | |
1133 | bh = sb_bread(inode->i_sb, block); | |
1134 | if (!bh) | |
1135 | goto out_noread; | |
9eb7f2c6 | 1136 | memcpy((void *)tmpde+slop, bh->b_data, offset); |
1da177e4 LT |
1137 | } |
1138 | de = tmpde; | |
1139 | } | |
1140 | ||
1141 | inode->i_size += isonum_733(de->size); | |
1142 | if (i == 1) { | |
1143 | ei->i_next_section_block = block_saved; | |
1144 | ei->i_next_section_offset = offset_saved; | |
1145 | } | |
1146 | ||
1147 | more_entries = de->flags[-high_sierra] & 0x80; | |
1148 | ||
1149 | i++; | |
9eb7f2c6 | 1150 | if (i > 100) |
1da177e4 | 1151 | goto out_toomany; |
9eb7f2c6 | 1152 | } while (more_entries); |
1da177e4 | 1153 | out: |
9eb7f2c6 | 1154 | kfree(tmpde); |
1da177e4 LT |
1155 | if (bh) |
1156 | brelse(bh); | |
1157 | return 0; | |
1158 | ||
1159 | out_nomem: | |
1160 | if (bh) | |
1161 | brelse(bh); | |
1162 | return -ENOMEM; | |
1163 | ||
1164 | out_noread: | |
1165 | printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block); | |
f99d49ad | 1166 | kfree(tmpde); |
1da177e4 LT |
1167 | return -EIO; |
1168 | ||
1169 | out_toomany: | |
1170 | printk(KERN_INFO "isofs_read_level3_size: " | |
1171 | "More than 100 file sections ?!?, aborting...\n" | |
1172 | "isofs_read_level3_size: inode=%lu\n", | |
1173 | inode->i_ino); | |
1174 | goto out; | |
1175 | } | |
1176 | ||
9eb7f2c6 | 1177 | static void isofs_read_inode(struct inode *inode) |
1da177e4 LT |
1178 | { |
1179 | struct super_block *sb = inode->i_sb; | |
1180 | struct isofs_sb_info *sbi = ISOFS_SB(sb); | |
1181 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
1182 | unsigned long block; | |
1183 | int high_sierra = sbi->s_high_sierra; | |
1184 | struct buffer_head * bh = NULL; | |
1185 | struct iso_directory_record * de; | |
1186 | struct iso_directory_record * tmpde = NULL; | |
1187 | unsigned int de_len; | |
1188 | unsigned long offset; | |
1189 | struct iso_inode_info *ei = ISOFS_I(inode); | |
1190 | ||
1191 | block = ei->i_iget5_block; | |
1192 | bh = sb_bread(inode->i_sb, block); | |
1193 | if (!bh) | |
1194 | goto out_badread; | |
1195 | ||
1196 | offset = ei->i_iget5_offset; | |
1197 | ||
1198 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
1199 | de_len = *(unsigned char *) de; | |
1200 | ||
1201 | if (offset + de_len > bufsize) { | |
1202 | int frag1 = bufsize - offset; | |
1203 | ||
1204 | tmpde = kmalloc(de_len, GFP_KERNEL); | |
1205 | if (tmpde == NULL) { | |
1206 | printk(KERN_INFO "isofs_read_inode: out of memory\n"); | |
1207 | goto fail; | |
1208 | } | |
1209 | memcpy(tmpde, bh->b_data + offset, frag1); | |
1210 | brelse(bh); | |
1211 | bh = sb_bread(inode->i_sb, ++block); | |
1212 | if (!bh) | |
1213 | goto out_badread; | |
1214 | memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1); | |
1215 | de = tmpde; | |
1216 | } | |
1217 | ||
1218 | inode->i_ino = isofs_get_ino(ei->i_iget5_block, | |
1219 | ei->i_iget5_offset, | |
1220 | ISOFS_BUFFER_BITS(inode)); | |
1221 | ||
1222 | /* Assume it is a normal-format file unless told otherwise */ | |
1223 | ei->i_file_format = isofs_file_normal; | |
1224 | ||
1225 | if (de->flags[-high_sierra] & 2) { | |
1226 | inode->i_mode = S_IRUGO | S_IXUGO | S_IFDIR; | |
1227 | inode->i_nlink = 1; /* Set to 1. We know there are 2, but | |
1228 | the find utility tries to optimize | |
1229 | if it is 2, and it screws up. It is | |
1230 | easier to give 1 which tells find to | |
1231 | do it the hard way. */ | |
1232 | } else { | |
1233 | /* Everybody gets to read the file. */ | |
1234 | inode->i_mode = sbi->s_mode; | |
1235 | inode->i_nlink = 1; | |
1236 | inode->i_mode |= S_IFREG; | |
1237 | } | |
1238 | inode->i_uid = sbi->s_uid; | |
1239 | inode->i_gid = sbi->s_gid; | |
1240 | inode->i_blocks = inode->i_blksize = 0; | |
1241 | ||
1242 | ei->i_format_parm[0] = 0; | |
1243 | ei->i_format_parm[1] = 0; | |
1244 | ei->i_format_parm[2] = 0; | |
1245 | ||
1246 | ei->i_section_size = isonum_733 (de->size); | |
9eb7f2c6 | 1247 | if (de->flags[-high_sierra] & 0x80) { |
1da177e4 LT |
1248 | if(isofs_read_level3_size(inode)) goto fail; |
1249 | } else { | |
1250 | ei->i_next_section_block = 0; | |
1251 | ei->i_next_section_offset = 0; | |
1252 | inode->i_size = isonum_733 (de->size); | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Some dipshit decided to store some other bit of information | |
1257 | * in the high byte of the file length. Truncate size in case | |
1258 | * this CDROM was mounted with the cruft option. | |
1259 | */ | |
1260 | ||
1261 | if (sbi->s_cruft == 'y') | |
1262 | inode->i_size &= 0x00ffffff; | |
1263 | ||
1264 | if (de->interleave[0]) { | |
1265 | printk("Interleaved files not (yet) supported.\n"); | |
1266 | inode->i_size = 0; | |
1267 | } | |
1268 | ||
1269 | /* I have no idea what file_unit_size is used for, so | |
1270 | we will flag it for now */ | |
1271 | if (de->file_unit_size[0] != 0) { | |
1272 | printk("File unit size != 0 for ISO file (%ld).\n", | |
1273 | inode->i_ino); | |
1274 | } | |
1275 | ||
1276 | /* I have no idea what other flag bits are used for, so | |
1277 | we will flag it for now */ | |
1278 | #ifdef DEBUG | |
1279 | if((de->flags[-high_sierra] & ~2)!= 0){ | |
1280 | printk("Unusual flag settings for ISO file (%ld %x).\n", | |
1281 | inode->i_ino, de->flags[-high_sierra]); | |
1282 | } | |
1283 | #endif | |
1284 | ||
1285 | inode->i_mtime.tv_sec = | |
1286 | inode->i_atime.tv_sec = | |
1287 | inode->i_ctime.tv_sec = iso_date(de->date, high_sierra); | |
1288 | inode->i_mtime.tv_nsec = | |
1289 | inode->i_atime.tv_nsec = | |
1290 | inode->i_ctime.tv_nsec = 0; | |
1291 | ||
1292 | ei->i_first_extent = (isonum_733 (de->extent) + | |
1293 | isonum_711 (de->ext_attr_length)); | |
1294 | ||
1295 | /* Set the number of blocks for stat() - should be done before RR */ | |
1296 | inode->i_blksize = PAGE_CACHE_SIZE; /* For stat() only */ | |
1297 | inode->i_blocks = (inode->i_size + 511) >> 9; | |
1298 | ||
1299 | /* | |
1300 | * Now test for possible Rock Ridge extensions which will override | |
1301 | * some of these numbers in the inode structure. | |
1302 | */ | |
1303 | ||
1304 | if (!high_sierra) { | |
1305 | parse_rock_ridge_inode(de, inode); | |
1306 | /* if we want uid/gid set, override the rock ridge setting */ | |
1307 | test_and_set_uid(&inode->i_uid, sbi->s_uid); | |
1308 | test_and_set_gid(&inode->i_gid, sbi->s_gid); | |
1309 | } | |
1310 | ||
1311 | /* Install the inode operations vector */ | |
1312 | if (S_ISREG(inode->i_mode)) { | |
1313 | inode->i_fop = &generic_ro_fops; | |
1314 | switch ( ei->i_file_format ) { | |
1315 | #ifdef CONFIG_ZISOFS | |
1316 | case isofs_file_compressed: | |
1317 | inode->i_data.a_ops = &zisofs_aops; | |
1318 | break; | |
1319 | #endif | |
1320 | default: | |
1321 | inode->i_data.a_ops = &isofs_aops; | |
1322 | break; | |
1323 | } | |
1324 | } else if (S_ISDIR(inode->i_mode)) { | |
1325 | inode->i_op = &isofs_dir_inode_operations; | |
1326 | inode->i_fop = &isofs_dir_operations; | |
1327 | } else if (S_ISLNK(inode->i_mode)) { | |
1328 | inode->i_op = &page_symlink_inode_operations; | |
1329 | inode->i_data.a_ops = &isofs_symlink_aops; | |
1330 | } else | |
1331 | /* XXX - parse_rock_ridge_inode() had already set i_rdev. */ | |
1332 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
1333 | ||
9eb7f2c6 | 1334 | out: |
f99d49ad | 1335 | kfree(tmpde); |
1da177e4 LT |
1336 | if (bh) |
1337 | brelse(bh); | |
1338 | return; | |
1339 | ||
9eb7f2c6 | 1340 | out_badread: |
1da177e4 | 1341 | printk(KERN_WARNING "ISOFS: unable to read i-node block\n"); |
9eb7f2c6 | 1342 | fail: |
1da177e4 LT |
1343 | make_bad_inode(inode); |
1344 | goto out; | |
1345 | } | |
1346 | ||
1347 | struct isofs_iget5_callback_data { | |
1348 | unsigned long block; | |
1349 | unsigned long offset; | |
1350 | }; | |
1351 | ||
1352 | static int isofs_iget5_test(struct inode *ino, void *data) | |
1353 | { | |
1354 | struct iso_inode_info *i = ISOFS_I(ino); | |
1355 | struct isofs_iget5_callback_data *d = | |
1356 | (struct isofs_iget5_callback_data*)data; | |
1357 | return (i->i_iget5_block == d->block) | |
1358 | && (i->i_iget5_offset == d->offset); | |
1359 | } | |
1360 | ||
1361 | static int isofs_iget5_set(struct inode *ino, void *data) | |
1362 | { | |
1363 | struct iso_inode_info *i = ISOFS_I(ino); | |
1364 | struct isofs_iget5_callback_data *d = | |
1365 | (struct isofs_iget5_callback_data*)data; | |
1366 | i->i_iget5_block = d->block; | |
1367 | i->i_iget5_offset = d->offset; | |
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | /* Store, in the inode's containing structure, the block and block | |
1372 | * offset that point to the underlying meta-data for the inode. The | |
1373 | * code below is otherwise similar to the iget() code in | |
1374 | * include/linux/fs.h */ | |
1375 | struct inode *isofs_iget(struct super_block *sb, | |
1376 | unsigned long block, | |
1377 | unsigned long offset) | |
1378 | { | |
1379 | unsigned long hashval; | |
1380 | struct inode *inode; | |
1381 | struct isofs_iget5_callback_data data; | |
1382 | ||
1383 | if (offset >= 1ul << sb->s_blocksize_bits) | |
1384 | return NULL; | |
1385 | ||
1386 | data.block = block; | |
1387 | data.offset = offset; | |
1388 | ||
1389 | hashval = (block << sb->s_blocksize_bits) | offset; | |
1390 | ||
9eb7f2c6 AM |
1391 | inode = iget5_locked(sb, hashval, &isofs_iget5_test, |
1392 | &isofs_iget5_set, &data); | |
1da177e4 LT |
1393 | |
1394 | if (inode && (inode->i_state & I_NEW)) { | |
1395 | sb->s_op->read_inode(inode); | |
1396 | unlock_new_inode(inode); | |
1397 | } | |
1398 | ||
1399 | return inode; | |
1400 | } | |
1401 | ||
454e2398 DH |
1402 | static int isofs_get_sb(struct file_system_type *fs_type, |
1403 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 1404 | { |
454e2398 DH |
1405 | return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super, |
1406 | mnt); | |
1da177e4 LT |
1407 | } |
1408 | ||
1409 | static struct file_system_type iso9660_fs_type = { | |
1410 | .owner = THIS_MODULE, | |
1411 | .name = "iso9660", | |
1412 | .get_sb = isofs_get_sb, | |
1413 | .kill_sb = kill_block_super, | |
1414 | .fs_flags = FS_REQUIRES_DEV, | |
1415 | }; | |
1416 | ||
1417 | static int __init init_iso9660_fs(void) | |
1418 | { | |
1419 | int err = init_inodecache(); | |
1420 | if (err) | |
1421 | goto out; | |
1422 | #ifdef CONFIG_ZISOFS | |
1423 | err = zisofs_init(); | |
1424 | if (err) | |
1425 | goto out1; | |
1426 | #endif | |
1427 | err = register_filesystem(&iso9660_fs_type); | |
1428 | if (err) | |
1429 | goto out2; | |
1430 | return 0; | |
1431 | out2: | |
1432 | #ifdef CONFIG_ZISOFS | |
1433 | zisofs_cleanup(); | |
1434 | out1: | |
1435 | #endif | |
1436 | destroy_inodecache(); | |
1437 | out: | |
1438 | return err; | |
1439 | } | |
1440 | ||
1441 | static void __exit exit_iso9660_fs(void) | |
1442 | { | |
1443 | unregister_filesystem(&iso9660_fs_type); | |
1444 | #ifdef CONFIG_ZISOFS | |
1445 | zisofs_cleanup(); | |
1446 | #endif | |
1447 | destroy_inodecache(); | |
1448 | } | |
1449 | ||
1450 | module_init(init_iso9660_fs) | |
1451 | module_exit(exit_iso9660_fs) | |
1452 | MODULE_LICENSE("GPL"); | |
1453 | /* Actual filesystem name is iso9660, as requested in filesystems.c */ | |
1454 | MODULE_ALIAS("iso9660"); |