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