Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-only
2 : /*
3 : * linux/fs/isofs/inode.c
4 : *
5 : * (C) 1991 Linus Torvalds - minix filesystem
6 : * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
7 : * 1994 Eberhard Mönkeberg - multi session handling.
8 : * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
9 : * 1997 Gordon Chaffee - Joliet CDs
10 : * 1998 Eric Lammerts - ISO 9660 Level 3
11 : * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
12 : * 2004 Paul Serice - NFS Export Operations
13 : */
14 :
15 : #include <linux/init.h>
16 : #include <linux/module.h>
17 :
18 : #include <linux/slab.h>
19 : #include <linux/cred.h>
20 : #include <linux/nls.h>
21 : #include <linux/ctype.h>
22 : #include <linux/statfs.h>
23 : #include <linux/cdrom.h>
24 : #include <linux/parser.h>
25 : #include <linux/mpage.h>
26 : #include <linux/user_namespace.h>
27 : #include <linux/seq_file.h>
28 : #include <linux/blkdev.h>
29 :
30 : #include "isofs.h"
31 : #include "zisofs.h"
32 :
33 : /* max tz offset is 13 hours */
34 : #define MAX_TZ_OFFSET (52*15*60)
35 :
36 : #define BEQUIET
37 :
38 : static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
39 : static int isofs_dentry_cmpi(const struct dentry *dentry,
40 : unsigned int len, const char *str, const struct qstr *name);
41 :
42 : #ifdef CONFIG_JOLIET
43 : static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
44 : static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
45 : static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
46 : unsigned int len, const char *str, const struct qstr *name);
47 : static int isofs_dentry_cmp_ms(const struct dentry *dentry,
48 : unsigned int len, const char *str, const struct qstr *name);
49 : #endif
50 :
51 0 : static void isofs_put_super(struct super_block *sb)
52 : {
53 0 : struct isofs_sb_info *sbi = ISOFS_SB(sb);
54 :
55 : #ifdef CONFIG_JOLIET
56 0 : unload_nls(sbi->s_nls_iocharset);
57 : #endif
58 :
59 0 : kfree(sbi);
60 0 : sb->s_fs_info = NULL;
61 0 : return;
62 : }
63 :
64 : static int isofs_read_inode(struct inode *, int relocated);
65 : static int isofs_statfs (struct dentry *, struct kstatfs *);
66 : static int isofs_show_options(struct seq_file *, struct dentry *);
67 :
68 : static struct kmem_cache *isofs_inode_cachep;
69 :
70 0 : static struct inode *isofs_alloc_inode(struct super_block *sb)
71 : {
72 0 : struct iso_inode_info *ei;
73 0 : ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
74 0 : if (!ei)
75 : return NULL;
76 0 : return &ei->vfs_inode;
77 : }
78 :
79 0 : static void isofs_free_inode(struct inode *inode)
80 : {
81 0 : kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
82 0 : }
83 :
84 0 : static void init_once(void *foo)
85 : {
86 0 : struct iso_inode_info *ei = foo;
87 :
88 0 : inode_init_once(&ei->vfs_inode);
89 0 : }
90 :
91 1 : static int __init init_inodecache(void)
92 : {
93 1 : isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
94 : sizeof(struct iso_inode_info),
95 : 0, (SLAB_RECLAIM_ACCOUNT|
96 : SLAB_MEM_SPREAD|SLAB_ACCOUNT),
97 : init_once);
98 1 : if (!isofs_inode_cachep)
99 0 : return -ENOMEM;
100 : return 0;
101 : }
102 :
103 0 : static void destroy_inodecache(void)
104 : {
105 : /*
106 : * Make sure all delayed rcu free inodes are flushed before we
107 : * destroy cache.
108 : */
109 0 : rcu_barrier();
110 0 : kmem_cache_destroy(isofs_inode_cachep);
111 0 : }
112 :
113 0 : static int isofs_remount(struct super_block *sb, int *flags, char *data)
114 : {
115 0 : sync_filesystem(sb);
116 0 : if (!(*flags & SB_RDONLY))
117 0 : return -EROFS;
118 : return 0;
119 : }
120 :
121 : static const struct super_operations isofs_sops = {
122 : .alloc_inode = isofs_alloc_inode,
123 : .free_inode = isofs_free_inode,
124 : .put_super = isofs_put_super,
125 : .statfs = isofs_statfs,
126 : .remount_fs = isofs_remount,
127 : .show_options = isofs_show_options,
128 : };
129 :
130 :
131 : static const struct dentry_operations isofs_dentry_ops[] = {
132 : {
133 : .d_hash = isofs_hashi,
134 : .d_compare = isofs_dentry_cmpi,
135 : },
136 : #ifdef CONFIG_JOLIET
137 : {
138 : .d_hash = isofs_hash_ms,
139 : .d_compare = isofs_dentry_cmp_ms,
140 : },
141 : {
142 : .d_hash = isofs_hashi_ms,
143 : .d_compare = isofs_dentry_cmpi_ms,
144 : },
145 : #endif
146 : };
147 :
148 : struct iso9660_options{
149 : unsigned int rock:1;
150 : unsigned int joliet:1;
151 : unsigned int cruft:1;
152 : unsigned int hide:1;
153 : unsigned int showassoc:1;
154 : unsigned int nocompress:1;
155 : unsigned int overriderockperm:1;
156 : unsigned int uid_set:1;
157 : unsigned int gid_set:1;
158 : unsigned int utf8:1;
159 : unsigned char map;
160 : unsigned char check;
161 : unsigned int blocksize;
162 : umode_t fmode;
163 : umode_t dmode;
164 : kgid_t gid;
165 : kuid_t uid;
166 : char *iocharset;
167 : /* LVE */
168 : s32 session;
169 : s32 sbsector;
170 : };
171 :
172 : /*
173 : * Compute the hash for the isofs name corresponding to the dentry.
174 : */
175 : static int
176 0 : isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
177 : {
178 0 : const char *name;
179 0 : int len;
180 0 : char c;
181 0 : unsigned long hash;
182 :
183 0 : len = qstr->len;
184 0 : name = qstr->name;
185 0 : if (ms) {
186 0 : while (len && name[len-1] == '.')
187 : len--;
188 : }
189 :
190 0 : hash = init_name_hash(dentry);
191 0 : while (len--) {
192 0 : c = tolower(*name++);
193 0 : hash = partial_name_hash(c, hash);
194 : }
195 0 : qstr->hash = end_name_hash(hash);
196 :
197 0 : return 0;
198 : }
199 :
200 : /*
201 : * Compare of two isofs names.
202 : */
203 0 : static int isofs_dentry_cmp_common(
204 : unsigned int len, const char *str,
205 : const struct qstr *name, int ms, int ci)
206 : {
207 0 : int alen, blen;
208 :
209 : /* A filename cannot end in '.' or we treat it like it has none */
210 0 : alen = name->len;
211 0 : blen = len;
212 0 : if (ms) {
213 0 : while (alen && name->name[alen-1] == '.')
214 : alen--;
215 0 : while (blen && str[blen-1] == '.')
216 : blen--;
217 : }
218 0 : if (alen == blen) {
219 0 : if (ci) {
220 0 : if (strncasecmp(name->name, str, alen) == 0)
221 0 : return 0;
222 : } else {
223 0 : if (strncmp(name->name, str, alen) == 0)
224 0 : return 0;
225 : }
226 : }
227 : return 1;
228 : }
229 :
230 : static int
231 0 : isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
232 : {
233 0 : return isofs_hashi_common(dentry, qstr, 0);
234 : }
235 :
236 : static int
237 0 : isofs_dentry_cmpi(const struct dentry *dentry,
238 : unsigned int len, const char *str, const struct qstr *name)
239 : {
240 0 : return isofs_dentry_cmp_common(len, str, name, 0, 1);
241 : }
242 :
243 : #ifdef CONFIG_JOLIET
244 : /*
245 : * Compute the hash for the isofs name corresponding to the dentry.
246 : */
247 : static int
248 0 : isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
249 : {
250 0 : const char *name;
251 0 : int len;
252 :
253 0 : len = qstr->len;
254 0 : name = qstr->name;
255 0 : if (ms) {
256 0 : while (len && name[len-1] == '.')
257 : len--;
258 : }
259 :
260 0 : qstr->hash = full_name_hash(dentry, name, len);
261 :
262 0 : return 0;
263 : }
264 :
265 : static int
266 0 : isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
267 : {
268 0 : return isofs_hash_common(dentry, qstr, 1);
269 : }
270 :
271 : static int
272 0 : isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
273 : {
274 0 : return isofs_hashi_common(dentry, qstr, 1);
275 : }
276 :
277 : static int
278 0 : isofs_dentry_cmp_ms(const struct dentry *dentry,
279 : unsigned int len, const char *str, const struct qstr *name)
280 : {
281 0 : return isofs_dentry_cmp_common(len, str, name, 1, 0);
282 : }
283 :
284 : static int
285 0 : isofs_dentry_cmpi_ms(const struct dentry *dentry,
286 : unsigned int len, const char *str, const struct qstr *name)
287 : {
288 0 : return isofs_dentry_cmp_common(len, str, name, 1, 1);
289 : }
290 : #endif
291 :
292 : enum {
293 : Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
294 : Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
295 : Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
296 : Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
297 : };
298 :
299 : static const match_table_t tokens = {
300 : {Opt_norock, "norock"},
301 : {Opt_nojoliet, "nojoliet"},
302 : {Opt_unhide, "unhide"},
303 : {Opt_hide, "hide"},
304 : {Opt_showassoc, "showassoc"},
305 : {Opt_cruft, "cruft"},
306 : {Opt_utf8, "utf8"},
307 : {Opt_iocharset, "iocharset=%s"},
308 : {Opt_map_a, "map=acorn"},
309 : {Opt_map_a, "map=a"},
310 : {Opt_map_n, "map=normal"},
311 : {Opt_map_n, "map=n"},
312 : {Opt_map_o, "map=off"},
313 : {Opt_map_o, "map=o"},
314 : {Opt_session, "session=%u"},
315 : {Opt_sb, "sbsector=%u"},
316 : {Opt_check_r, "check=relaxed"},
317 : {Opt_check_r, "check=r"},
318 : {Opt_check_s, "check=strict"},
319 : {Opt_check_s, "check=s"},
320 : {Opt_uid, "uid=%u"},
321 : {Opt_gid, "gid=%u"},
322 : {Opt_mode, "mode=%u"},
323 : {Opt_dmode, "dmode=%u"},
324 : {Opt_overriderockperm, "overriderockperm"},
325 : {Opt_block, "block=%u"},
326 : {Opt_ignore, "conv=binary"},
327 : {Opt_ignore, "conv=b"},
328 : {Opt_ignore, "conv=text"},
329 : {Opt_ignore, "conv=t"},
330 : {Opt_ignore, "conv=mtext"},
331 : {Opt_ignore, "conv=m"},
332 : {Opt_ignore, "conv=auto"},
333 : {Opt_ignore, "conv=a"},
334 : {Opt_nocompress, "nocompress"},
335 : {Opt_err, NULL}
336 : };
337 :
338 0 : static int parse_options(char *options, struct iso9660_options *popt)
339 : {
340 0 : char *p;
341 0 : int option;
342 0 : unsigned int uv;
343 :
344 0 : popt->map = 'n';
345 0 : popt->rock = 1;
346 0 : popt->joliet = 1;
347 0 : popt->cruft = 0;
348 0 : popt->hide = 0;
349 0 : popt->showassoc = 0;
350 0 : popt->check = 'u'; /* unset */
351 0 : popt->nocompress = 0;
352 0 : popt->blocksize = 1024;
353 0 : popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
354 0 : popt->uid_set = 0;
355 0 : popt->gid_set = 0;
356 0 : popt->gid = GLOBAL_ROOT_GID;
357 0 : popt->uid = GLOBAL_ROOT_UID;
358 0 : popt->iocharset = NULL;
359 0 : popt->utf8 = 0;
360 0 : popt->overriderockperm = 0;
361 0 : popt->session=-1;
362 0 : popt->sbsector=-1;
363 0 : if (!options)
364 : return 1;
365 :
366 0 : while ((p = strsep(&options, ",")) != NULL) {
367 0 : int token;
368 0 : substring_t args[MAX_OPT_ARGS];
369 0 : unsigned n;
370 :
371 0 : if (!*p)
372 0 : continue;
373 :
374 0 : token = match_token(p, tokens, args);
375 0 : switch (token) {
376 0 : case Opt_norock:
377 0 : popt->rock = 0;
378 0 : break;
379 0 : case Opt_nojoliet:
380 0 : popt->joliet = 0;
381 0 : break;
382 0 : case Opt_hide:
383 0 : popt->hide = 1;
384 0 : break;
385 0 : case Opt_unhide:
386 : case Opt_showassoc:
387 0 : popt->showassoc = 1;
388 0 : break;
389 0 : case Opt_cruft:
390 0 : popt->cruft = 1;
391 0 : break;
392 0 : case Opt_utf8:
393 0 : popt->utf8 = 1;
394 0 : break;
395 : #ifdef CONFIG_JOLIET
396 0 : case Opt_iocharset:
397 0 : kfree(popt->iocharset);
398 0 : popt->iocharset = match_strdup(&args[0]);
399 0 : if (!popt->iocharset)
400 0 : return 0;
401 : break;
402 : #endif
403 0 : case Opt_map_a:
404 0 : popt->map = 'a';
405 0 : break;
406 0 : case Opt_map_o:
407 0 : popt->map = 'o';
408 0 : break;
409 0 : case Opt_map_n:
410 0 : popt->map = 'n';
411 0 : break;
412 0 : case Opt_session:
413 0 : if (match_int(&args[0], &option))
414 : return 0;
415 0 : n = option;
416 : /*
417 : * Track numbers are supposed to be in range 1-99, the
418 : * mount option starts indexing at 0.
419 : */
420 0 : if (n >= 99)
421 : return 0;
422 0 : popt->session = n + 1;
423 0 : break;
424 0 : case Opt_sb:
425 0 : if (match_int(&args[0], &option))
426 : return 0;
427 0 : popt->sbsector = option;
428 0 : break;
429 0 : case Opt_check_r:
430 0 : popt->check = 'r';
431 0 : break;
432 0 : case Opt_check_s:
433 0 : popt->check = 's';
434 0 : break;
435 : case Opt_ignore:
436 : break;
437 0 : case Opt_uid:
438 0 : if (match_uint(&args[0], &uv))
439 : return 0;
440 0 : popt->uid = make_kuid(current_user_ns(), uv);
441 0 : if (!uid_valid(popt->uid))
442 : return 0;
443 0 : popt->uid_set = 1;
444 0 : break;
445 0 : case Opt_gid:
446 0 : if (match_uint(&args[0], &uv))
447 : return 0;
448 0 : popt->gid = make_kgid(current_user_ns(), uv);
449 0 : if (!gid_valid(popt->gid))
450 : return 0;
451 0 : popt->gid_set = 1;
452 0 : break;
453 0 : case Opt_mode:
454 0 : if (match_int(&args[0], &option))
455 : return 0;
456 0 : popt->fmode = option;
457 0 : break;
458 0 : case Opt_dmode:
459 0 : if (match_int(&args[0], &option))
460 : return 0;
461 0 : popt->dmode = option;
462 0 : break;
463 0 : case Opt_overriderockperm:
464 0 : popt->overriderockperm = 1;
465 0 : break;
466 0 : case Opt_block:
467 0 : if (match_int(&args[0], &option))
468 : return 0;
469 0 : n = option;
470 0 : if (n != 512 && n != 1024 && n != 2048)
471 : return 0;
472 0 : popt->blocksize = n;
473 0 : break;
474 0 : case Opt_nocompress:
475 0 : popt->nocompress = 1;
476 0 : break;
477 : default:
478 : return 0;
479 : }
480 : }
481 : return 1;
482 : }
483 :
484 : /*
485 : * Display the mount options in /proc/mounts.
486 : */
487 0 : static int isofs_show_options(struct seq_file *m, struct dentry *root)
488 : {
489 0 : struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
490 :
491 0 : if (!sbi->s_rock) seq_puts(m, ",norock");
492 0 : else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
493 0 : if (sbi->s_cruft) seq_puts(m, ",cruft");
494 0 : if (sbi->s_hide) seq_puts(m, ",hide");
495 0 : if (sbi->s_nocompress) seq_puts(m, ",nocompress");
496 0 : if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
497 0 : if (sbi->s_showassoc) seq_puts(m, ",showassoc");
498 0 : if (sbi->s_utf8) seq_puts(m, ",utf8");
499 :
500 0 : if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
501 0 : if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
502 0 : if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
503 0 : if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
504 :
505 0 : if (root->d_sb->s_blocksize != 1024)
506 0 : seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
507 :
508 0 : if (sbi->s_uid_set)
509 0 : seq_printf(m, ",uid=%u",
510 : from_kuid_munged(&init_user_ns, sbi->s_uid));
511 0 : if (sbi->s_gid_set)
512 0 : seq_printf(m, ",gid=%u",
513 : from_kgid_munged(&init_user_ns, sbi->s_gid));
514 :
515 0 : if (sbi->s_dmode != ISOFS_INVALID_MODE)
516 0 : seq_printf(m, ",dmode=%o", sbi->s_dmode);
517 0 : if (sbi->s_fmode != ISOFS_INVALID_MODE)
518 0 : seq_printf(m, ",fmode=%o", sbi->s_fmode);
519 :
520 : #ifdef CONFIG_JOLIET
521 0 : if (sbi->s_nls_iocharset &&
522 0 : strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
523 0 : seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
524 : #endif
525 0 : return 0;
526 : }
527 :
528 : /*
529 : * look if the driver can tell the multi session redirection value
530 : *
531 : * don't change this if you don't know what you do, please!
532 : * Multisession is legal only with XA disks.
533 : * A non-XA disk with more than one volume descriptor may do it right, but
534 : * usually is written in a nowhere standardized "multi-partition" manner.
535 : * Multisession uses absolute addressing (solely the first frame of the whole
536 : * track is #0), multi-partition uses relative addressing (each first frame of
537 : * each track is #0), and a track is not a session.
538 : *
539 : * A broken CDwriter software or drive firmware does not set new standards,
540 : * at least not if conflicting with the existing ones.
541 : *
542 : * emoenke@gwdg.de
543 : */
544 : #define WE_OBEY_THE_WRITTEN_STANDARDS 1
545 :
546 0 : static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
547 : {
548 0 : struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
549 0 : unsigned int vol_desc_start = 0;
550 :
551 0 : if (session > 0) {
552 0 : struct cdrom_tocentry te;
553 :
554 0 : if (!cdi)
555 0 : return 0;
556 :
557 0 : te.cdte_track = session;
558 0 : te.cdte_format = CDROM_LBA;
559 0 : if (cdrom_read_tocentry(cdi, &te) == 0) {
560 0 : printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
561 : session, te.cdte_addr.lba,
562 0 : te.cdte_ctrl & CDROM_DATA_TRACK);
563 0 : if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
564 0 : return te.cdte_addr.lba;
565 : }
566 :
567 0 : printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
568 : }
569 :
570 0 : if (cdi) {
571 0 : struct cdrom_multisession ms_info;
572 :
573 0 : ms_info.addr_format = CDROM_LBA;
574 0 : if (cdrom_multisession(cdi, &ms_info) == 0) {
575 : #if WE_OBEY_THE_WRITTEN_STANDARDS
576 : /* necessary for a valid ms_info.addr */
577 0 : if (ms_info.xa_flag)
578 : #endif
579 0 : vol_desc_start = ms_info.addr.lba;
580 : }
581 : }
582 :
583 : return vol_desc_start;
584 : }
585 :
586 : /*
587 : * Check if root directory is empty (has less than 3 files).
588 : *
589 : * Used to detect broken CDs where ISO root directory is empty but Joliet root
590 : * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
591 : * (and Joliet used instead) or else no files would be visible.
592 : */
593 0 : static bool rootdir_empty(struct super_block *sb, unsigned long block)
594 : {
595 0 : int offset = 0, files = 0, de_len;
596 0 : struct iso_directory_record *de;
597 0 : struct buffer_head *bh;
598 :
599 0 : bh = sb_bread(sb, block);
600 0 : if (!bh)
601 : return true;
602 0 : while (files < 3) {
603 0 : de = (struct iso_directory_record *) (bh->b_data + offset);
604 0 : de_len = *(unsigned char *) de;
605 0 : if (de_len == 0)
606 : break;
607 0 : files++;
608 0 : offset += de_len;
609 : }
610 0 : brelse(bh);
611 0 : return files < 3;
612 : }
613 :
614 : /*
615 : * Initialize the superblock and read the root inode.
616 : */
617 0 : static int isofs_fill_super(struct super_block *s, void *data, int silent)
618 : {
619 0 : struct buffer_head *bh = NULL, *pri_bh = NULL;
620 0 : struct hs_primary_descriptor *h_pri = NULL;
621 0 : struct iso_primary_descriptor *pri = NULL;
622 0 : struct iso_supplementary_descriptor *sec = NULL;
623 0 : struct iso_directory_record *rootp;
624 0 : struct inode *inode;
625 0 : struct iso9660_options opt;
626 0 : struct isofs_sb_info *sbi;
627 0 : unsigned long first_data_zone;
628 0 : int joliet_level = 0;
629 0 : int iso_blknum, block;
630 0 : int orig_zonesize;
631 0 : int table, error = -EINVAL;
632 0 : unsigned int vol_desc_start;
633 :
634 0 : sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
635 0 : if (!sbi)
636 : return -ENOMEM;
637 0 : s->s_fs_info = sbi;
638 :
639 0 : if (!parse_options((char *)data, &opt))
640 0 : goto out_freesbi;
641 :
642 : /*
643 : * First of all, get the hardware blocksize for this device.
644 : * If we don't know what it is, or the hardware blocksize is
645 : * larger than the blocksize the user specified, then use
646 : * that value.
647 : */
648 : /*
649 : * What if bugger tells us to go beyond page size?
650 : */
651 0 : if (bdev_logical_block_size(s->s_bdev) > 2048) {
652 0 : printk(KERN_WARNING
653 : "ISOFS: unsupported/invalid hardware sector size %d\n",
654 : bdev_logical_block_size(s->s_bdev));
655 0 : goto out_freesbi;
656 : }
657 0 : opt.blocksize = sb_min_blocksize(s, opt.blocksize);
658 :
659 0 : sbi->s_high_sierra = 0; /* default is iso9660 */
660 0 : sbi->s_session = opt.session;
661 0 : sbi->s_sbsector = opt.sbsector;
662 :
663 0 : vol_desc_start = (opt.sbsector != -1) ?
664 0 : opt.sbsector : isofs_get_last_session(s,opt.session);
665 :
666 0 : for (iso_blknum = vol_desc_start+16;
667 0 : iso_blknum < vol_desc_start+100; iso_blknum++) {
668 0 : struct hs_volume_descriptor *hdp;
669 0 : struct iso_volume_descriptor *vdp;
670 :
671 0 : block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
672 0 : if (!(bh = sb_bread(s, block)))
673 0 : goto out_no_read;
674 :
675 0 : vdp = (struct iso_volume_descriptor *)bh->b_data;
676 0 : hdp = (struct hs_volume_descriptor *)bh->b_data;
677 :
678 : /*
679 : * Due to the overlapping physical location of the descriptors,
680 : * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
681 : * proper identification in this case, we first check for ISO.
682 : */
683 0 : if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
684 0 : if (isonum_711(vdp->type) == ISO_VD_END)
685 : break;
686 0 : if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
687 0 : if (!pri) {
688 0 : pri = (struct iso_primary_descriptor *)vdp;
689 : /* Save the buffer in case we need it ... */
690 0 : pri_bh = bh;
691 0 : bh = NULL;
692 : }
693 : }
694 : #ifdef CONFIG_JOLIET
695 0 : else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
696 0 : sec = (struct iso_supplementary_descriptor *)vdp;
697 0 : if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
698 0 : if (opt.joliet) {
699 0 : if (sec->escape[2] == 0x40)
700 : joliet_level = 1;
701 0 : else if (sec->escape[2] == 0x43)
702 : joliet_level = 2;
703 0 : else if (sec->escape[2] == 0x45)
704 0 : joliet_level = 3;
705 :
706 0 : printk(KERN_DEBUG "ISO 9660 Extensions: "
707 : "Microsoft Joliet Level %d\n",
708 : joliet_level);
709 : }
710 0 : goto root_found;
711 : } else {
712 : /* Unknown supplementary volume descriptor */
713 : sec = NULL;
714 : }
715 : }
716 : #endif
717 : } else {
718 0 : if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
719 0 : if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
720 0 : goto out_freebh;
721 :
722 0 : sbi->s_high_sierra = 1;
723 0 : opt.rock = 0;
724 0 : h_pri = (struct hs_primary_descriptor *)vdp;
725 0 : goto root_found;
726 : }
727 : }
728 :
729 : /* Just skip any volume descriptors we don't recognize */
730 :
731 0 : brelse(bh);
732 0 : bh = NULL;
733 : }
734 : /*
735 : * If we fall through, either no volume descriptor was found,
736 : * or else we passed a primary descriptor looking for others.
737 : */
738 0 : if (!pri)
739 0 : goto out_unknown_format;
740 0 : brelse(bh);
741 : bh = pri_bh;
742 : pri_bh = NULL;
743 :
744 0 : root_found:
745 : /* We don't support read-write mounts */
746 0 : if (!sb_rdonly(s)) {
747 0 : error = -EACCES;
748 0 : goto out_freebh;
749 : }
750 :
751 0 : if (joliet_level && (!pri || !opt.rock)) {
752 : /* This is the case of Joliet with the norock mount flag.
753 : * A disc with both Joliet and Rock Ridge is handled later
754 : */
755 0 : pri = (struct iso_primary_descriptor *) sec;
756 : }
757 :
758 0 : if(sbi->s_high_sierra){
759 0 : rootp = (struct iso_directory_record *) h_pri->root_directory_record;
760 0 : sbi->s_nzones = isonum_733(h_pri->volume_space_size);
761 0 : sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
762 0 : sbi->s_max_size = isonum_733(h_pri->volume_space_size);
763 : } else {
764 0 : if (!pri)
765 0 : goto out_freebh;
766 0 : rootp = (struct iso_directory_record *) pri->root_directory_record;
767 0 : sbi->s_nzones = isonum_733(pri->volume_space_size);
768 0 : sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
769 0 : sbi->s_max_size = isonum_733(pri->volume_space_size);
770 : }
771 :
772 0 : sbi->s_ninodes = 0; /* No way to figure this out easily */
773 :
774 0 : orig_zonesize = sbi->s_log_zone_size;
775 : /*
776 : * If the zone size is smaller than the hardware sector size,
777 : * this is a fatal error. This would occur if the disc drive
778 : * had sectors that were 2048 bytes, but the filesystem had
779 : * blocks that were 512 bytes (which should only very rarely
780 : * happen.)
781 : */
782 0 : if (orig_zonesize < opt.blocksize)
783 0 : goto out_bad_size;
784 :
785 : /* RDE: convert log zone size to bit shift */
786 0 : switch (sbi->s_log_zone_size) {
787 0 : case 512: sbi->s_log_zone_size = 9; break;
788 0 : case 1024: sbi->s_log_zone_size = 10; break;
789 0 : case 2048: sbi->s_log_zone_size = 11; break;
790 :
791 0 : default:
792 0 : goto out_bad_zone_size;
793 : }
794 :
795 0 : s->s_magic = ISOFS_SUPER_MAGIC;
796 :
797 : /*
798 : * With multi-extent files, file size is only limited by the maximum
799 : * size of a file system, which is 8 TB.
800 : */
801 0 : s->s_maxbytes = 0x80000000000LL;
802 :
803 : /* ECMA-119 timestamp from 1900/1/1 with tz offset */
804 0 : s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
805 0 : s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
806 :
807 : /* Set this for reference. Its not currently used except on write
808 : which we don't have .. */
809 :
810 0 : first_data_zone = isonum_733(rootp->extent) +
811 0 : isonum_711(rootp->ext_attr_length);
812 0 : sbi->s_firstdatazone = first_data_zone;
813 : #ifndef BEQUIET
814 : printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
815 : sbi->s_max_size, 1UL << sbi->s_log_zone_size);
816 : printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
817 : if(sbi->s_high_sierra)
818 : printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
819 : #endif
820 :
821 : /*
822 : * If the Joliet level is set, we _may_ decide to use the
823 : * secondary descriptor, but can't be sure until after we
824 : * read the root inode. But before reading the root inode
825 : * we may need to change the device blocksize, and would
826 : * rather release the old buffer first. So, we cache the
827 : * first_data_zone value from the secondary descriptor.
828 : */
829 0 : if (joliet_level) {
830 0 : pri = (struct iso_primary_descriptor *) sec;
831 0 : rootp = (struct iso_directory_record *)
832 : pri->root_directory_record;
833 0 : first_data_zone = isonum_733(rootp->extent) +
834 0 : isonum_711(rootp->ext_attr_length);
835 : }
836 :
837 : /*
838 : * We're all done using the volume descriptor, and may need
839 : * to change the device blocksize, so release the buffer now.
840 : */
841 0 : brelse(pri_bh);
842 0 : brelse(bh);
843 :
844 : /*
845 : * Force the blocksize to 512 for 512 byte sectors. The file
846 : * read primitives really get it wrong in a bad way if we don't
847 : * do this.
848 : *
849 : * Note - we should never be setting the blocksize to something
850 : * less than the hardware sector size for the device. If we
851 : * do, we would end up having to read larger buffers and split
852 : * out portions to satisfy requests.
853 : *
854 : * Note2- the idea here is that we want to deal with the optimal
855 : * zonesize in the filesystem. If we have it set to something less,
856 : * then we have horrible problems with trying to piece together
857 : * bits of adjacent blocks in order to properly read directory
858 : * entries. By forcing the blocksize in this way, we ensure
859 : * that we will never be required to do this.
860 : */
861 0 : sb_set_blocksize(s, orig_zonesize);
862 :
863 0 : sbi->s_nls_iocharset = NULL;
864 :
865 : #ifdef CONFIG_JOLIET
866 0 : if (joliet_level && opt.utf8 == 0) {
867 0 : char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
868 0 : sbi->s_nls_iocharset = load_nls(p);
869 0 : if (! sbi->s_nls_iocharset) {
870 : /* Fail only if explicit charset specified */
871 0 : if (opt.iocharset)
872 0 : goto out_freesbi;
873 0 : sbi->s_nls_iocharset = load_nls_default();
874 : }
875 : }
876 : #endif
877 0 : s->s_op = &isofs_sops;
878 0 : s->s_export_op = &isofs_export_ops;
879 0 : sbi->s_mapping = opt.map;
880 0 : sbi->s_rock = (opt.rock ? 2 : 0);
881 0 : sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
882 0 : sbi->s_cruft = opt.cruft;
883 0 : sbi->s_hide = opt.hide;
884 0 : sbi->s_showassoc = opt.showassoc;
885 0 : sbi->s_uid = opt.uid;
886 0 : sbi->s_gid = opt.gid;
887 0 : sbi->s_uid_set = opt.uid_set;
888 0 : sbi->s_gid_set = opt.gid_set;
889 0 : sbi->s_utf8 = opt.utf8;
890 0 : sbi->s_nocompress = opt.nocompress;
891 0 : sbi->s_overriderockperm = opt.overriderockperm;
892 : /*
893 : * It would be incredibly stupid to allow people to mark every file
894 : * on the disk as suid, so we merely allow them to set the default
895 : * permissions.
896 : */
897 0 : if (opt.fmode != ISOFS_INVALID_MODE)
898 0 : sbi->s_fmode = opt.fmode & 0777;
899 : else
900 0 : sbi->s_fmode = ISOFS_INVALID_MODE;
901 0 : if (opt.dmode != ISOFS_INVALID_MODE)
902 0 : sbi->s_dmode = opt.dmode & 0777;
903 : else
904 0 : sbi->s_dmode = ISOFS_INVALID_MODE;
905 :
906 : /*
907 : * Read the root inode, which _may_ result in changing
908 : * the s_rock flag. Once we have the final s_rock value,
909 : * we then decide whether to use the Joliet descriptor.
910 : */
911 0 : inode = isofs_iget(s, sbi->s_firstdatazone, 0);
912 0 : if (IS_ERR(inode))
913 0 : goto out_no_root;
914 :
915 : /*
916 : * Fix for broken CDs with Rock Ridge and empty ISO root directory but
917 : * correct Joliet root directory.
918 : */
919 0 : if (sbi->s_rock == 1 && joliet_level &&
920 0 : rootdir_empty(s, sbi->s_firstdatazone)) {
921 0 : printk(KERN_NOTICE
922 : "ISOFS: primary root directory is empty. "
923 : "Disabling Rock Ridge and switching to Joliet.");
924 0 : sbi->s_rock = 0;
925 : }
926 :
927 : /*
928 : * If this disk has both Rock Ridge and Joliet on it, then we
929 : * want to use Rock Ridge by default. This can be overridden
930 : * by using the norock mount option. There is still one other
931 : * possibility that is not taken into account: a Rock Ridge
932 : * CD with Unicode names. Until someone sees such a beast, it
933 : * will not be supported.
934 : */
935 0 : if (sbi->s_rock == 1) {
936 : joliet_level = 0;
937 0 : } else if (joliet_level) {
938 0 : sbi->s_rock = 0;
939 0 : if (sbi->s_firstdatazone != first_data_zone) {
940 0 : sbi->s_firstdatazone = first_data_zone;
941 0 : printk(KERN_DEBUG
942 : "ISOFS: changing to secondary root\n");
943 0 : iput(inode);
944 0 : inode = isofs_iget(s, sbi->s_firstdatazone, 0);
945 0 : if (IS_ERR(inode))
946 0 : goto out_no_root;
947 : }
948 : }
949 :
950 0 : if (opt.check == 'u') {
951 : /* Only Joliet is case insensitive by default */
952 0 : if (joliet_level)
953 0 : opt.check = 'r';
954 : else
955 0 : opt.check = 's';
956 : }
957 0 : sbi->s_joliet_level = joliet_level;
958 :
959 : /* Make sure the root inode is a directory */
960 0 : if (!S_ISDIR(inode->i_mode)) {
961 0 : printk(KERN_WARNING
962 : "isofs_fill_super: root inode is not a directory. "
963 : "Corrupted media?\n");
964 0 : goto out_iput;
965 : }
966 :
967 0 : table = 0;
968 0 : if (joliet_level)
969 0 : table += 2;
970 0 : if (opt.check == 'r')
971 0 : table++;
972 0 : sbi->s_check = opt.check;
973 :
974 0 : if (table)
975 0 : s->s_d_op = &isofs_dentry_ops[table - 1];
976 :
977 : /* get the root dentry */
978 0 : s->s_root = d_make_root(inode);
979 0 : if (!(s->s_root)) {
980 0 : error = -ENOMEM;
981 0 : goto out_no_inode;
982 : }
983 :
984 0 : kfree(opt.iocharset);
985 :
986 0 : return 0;
987 :
988 : /*
989 : * Display error messages and free resources.
990 : */
991 0 : out_iput:
992 0 : iput(inode);
993 0 : goto out_no_inode;
994 0 : out_no_root:
995 0 : error = PTR_ERR(inode);
996 0 : if (error != -ENOMEM)
997 0 : printk(KERN_WARNING "%s: get root inode failed\n", __func__);
998 0 : out_no_inode:
999 : #ifdef CONFIG_JOLIET
1000 0 : unload_nls(sbi->s_nls_iocharset);
1001 : #endif
1002 0 : goto out_freesbi;
1003 0 : out_no_read:
1004 0 : printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1005 0 : __func__, s->s_id, iso_blknum, block);
1006 0 : goto out_freebh;
1007 0 : out_bad_zone_size:
1008 0 : printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1009 : sbi->s_log_zone_size);
1010 0 : goto out_freebh;
1011 0 : out_bad_size:
1012 0 : printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1013 : orig_zonesize, opt.blocksize);
1014 0 : goto out_freebh;
1015 0 : out_unknown_format:
1016 0 : if (!silent)
1017 0 : printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1018 :
1019 0 : out_freebh:
1020 0 : brelse(bh);
1021 0 : brelse(pri_bh);
1022 0 : out_freesbi:
1023 0 : kfree(opt.iocharset);
1024 0 : kfree(sbi);
1025 0 : s->s_fs_info = NULL;
1026 0 : return error;
1027 : }
1028 :
1029 0 : static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1030 : {
1031 0 : struct super_block *sb = dentry->d_sb;
1032 0 : u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1033 :
1034 0 : buf->f_type = ISOFS_SUPER_MAGIC;
1035 0 : buf->f_bsize = sb->s_blocksize;
1036 0 : buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1037 0 : << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1038 0 : buf->f_bfree = 0;
1039 0 : buf->f_bavail = 0;
1040 0 : buf->f_files = ISOFS_SB(sb)->s_ninodes;
1041 0 : buf->f_ffree = 0;
1042 0 : buf->f_fsid = u64_to_fsid(id);
1043 0 : buf->f_namelen = NAME_MAX;
1044 0 : return 0;
1045 : }
1046 :
1047 : /*
1048 : * Get a set of blocks; filling in buffer_heads if already allocated
1049 : * or getblk() if they are not. Returns the number of blocks inserted
1050 : * (-ve == error.)
1051 : */
1052 0 : int isofs_get_blocks(struct inode *inode, sector_t iblock,
1053 : struct buffer_head **bh, unsigned long nblocks)
1054 : {
1055 0 : unsigned long b_off = iblock;
1056 0 : unsigned offset, sect_size;
1057 0 : unsigned int firstext;
1058 0 : unsigned long nextblk, nextoff;
1059 0 : int section, rv, error;
1060 0 : struct iso_inode_info *ei = ISOFS_I(inode);
1061 :
1062 0 : error = -EIO;
1063 0 : rv = 0;
1064 0 : if (iblock != b_off) {
1065 : printk(KERN_DEBUG "%s: block number too large\n", __func__);
1066 : goto abort;
1067 : }
1068 :
1069 :
1070 0 : offset = 0;
1071 0 : firstext = ei->i_first_extent;
1072 0 : sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1073 0 : nextblk = ei->i_next_section_block;
1074 0 : nextoff = ei->i_next_section_offset;
1075 0 : section = 0;
1076 :
1077 0 : while (nblocks) {
1078 : /* If we are *way* beyond the end of the file, print a message.
1079 : * Access beyond the end of the file up to the next page boundary
1080 : * is normal, however because of the way the page cache works.
1081 : * In this case, we just return 0 so that we can properly fill
1082 : * the page with useless information without generating any
1083 : * I/O errors.
1084 : */
1085 0 : if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1086 0 : printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1087 : __func__, b_off,
1088 : (unsigned long long)inode->i_size);
1089 0 : goto abort;
1090 : }
1091 :
1092 : /* On the last section, nextblk == 0, section size is likely to
1093 : * exceed sect_size by a partial block, and access beyond the
1094 : * end of the file will reach beyond the section size, too.
1095 : */
1096 0 : while (nextblk && (b_off >= (offset + sect_size))) {
1097 0 : struct inode *ninode;
1098 :
1099 0 : offset += sect_size;
1100 0 : ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1101 0 : if (IS_ERR(ninode)) {
1102 0 : error = PTR_ERR(ninode);
1103 0 : goto abort;
1104 : }
1105 0 : firstext = ISOFS_I(ninode)->i_first_extent;
1106 0 : sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1107 0 : nextblk = ISOFS_I(ninode)->i_next_section_block;
1108 0 : nextoff = ISOFS_I(ninode)->i_next_section_offset;
1109 0 : iput(ninode);
1110 :
1111 0 : if (++section > 100) {
1112 0 : printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1113 : " aborting...\n", __func__);
1114 0 : printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1115 : "nextblk=%lu nextoff=%lu\n", __func__,
1116 : b_off, firstext, (unsigned) sect_size,
1117 : nextblk, nextoff);
1118 0 : goto abort;
1119 : }
1120 : }
1121 :
1122 0 : if (*bh) {
1123 0 : map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1124 : } else {
1125 0 : *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1126 0 : if (!*bh)
1127 0 : goto abort;
1128 : }
1129 0 : bh++; /* Next buffer head */
1130 0 : b_off++; /* Next buffer offset */
1131 0 : nblocks--;
1132 0 : rv++;
1133 : }
1134 :
1135 : error = 0;
1136 0 : abort:
1137 0 : return rv != 0 ? rv : error;
1138 : }
1139 :
1140 : /*
1141 : * Used by the standard interfaces.
1142 : */
1143 0 : static int isofs_get_block(struct inode *inode, sector_t iblock,
1144 : struct buffer_head *bh_result, int create)
1145 : {
1146 0 : int ret;
1147 :
1148 0 : if (create) {
1149 0 : printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1150 0 : return -EROFS;
1151 : }
1152 :
1153 0 : ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1154 0 : return ret < 0 ? ret : 0;
1155 : }
1156 :
1157 0 : static int isofs_bmap(struct inode *inode, sector_t block)
1158 : {
1159 0 : struct buffer_head dummy;
1160 0 : int error;
1161 :
1162 0 : dummy.b_state = 0;
1163 0 : dummy.b_blocknr = -1000;
1164 0 : error = isofs_get_block(inode, block, &dummy, 0);
1165 0 : if (!error)
1166 0 : return dummy.b_blocknr;
1167 : return 0;
1168 : }
1169 :
1170 0 : struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1171 : {
1172 0 : sector_t blknr = isofs_bmap(inode, block);
1173 0 : if (!blknr)
1174 : return NULL;
1175 0 : return sb_bread(inode->i_sb, blknr);
1176 : }
1177 :
1178 0 : static int isofs_readpage(struct file *file, struct page *page)
1179 : {
1180 0 : return mpage_readpage(page, isofs_get_block);
1181 : }
1182 :
1183 0 : static void isofs_readahead(struct readahead_control *rac)
1184 : {
1185 0 : mpage_readahead(rac, isofs_get_block);
1186 0 : }
1187 :
1188 0 : static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1189 : {
1190 0 : return generic_block_bmap(mapping,block,isofs_get_block);
1191 : }
1192 :
1193 : static const struct address_space_operations isofs_aops = {
1194 : .readpage = isofs_readpage,
1195 : .readahead = isofs_readahead,
1196 : .bmap = _isofs_bmap
1197 : };
1198 :
1199 0 : static int isofs_read_level3_size(struct inode *inode)
1200 : {
1201 0 : unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1202 0 : int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1203 0 : struct buffer_head *bh = NULL;
1204 0 : unsigned long block, offset, block_saved, offset_saved;
1205 0 : int i = 0;
1206 0 : int more_entries = 0;
1207 0 : struct iso_directory_record *tmpde = NULL;
1208 0 : struct iso_inode_info *ei = ISOFS_I(inode);
1209 :
1210 0 : inode->i_size = 0;
1211 :
1212 : /* The first 16 blocks are reserved as the System Area. Thus,
1213 : * no inodes can appear in block 0. We use this to flag that
1214 : * this is the last section. */
1215 0 : ei->i_next_section_block = 0;
1216 0 : ei->i_next_section_offset = 0;
1217 :
1218 0 : block = ei->i_iget5_block;
1219 0 : offset = ei->i_iget5_offset;
1220 :
1221 0 : do {
1222 0 : struct iso_directory_record *de;
1223 0 : unsigned int de_len;
1224 :
1225 0 : if (!bh) {
1226 0 : bh = sb_bread(inode->i_sb, block);
1227 0 : if (!bh)
1228 0 : goto out_noread;
1229 : }
1230 0 : de = (struct iso_directory_record *) (bh->b_data + offset);
1231 0 : de_len = *(unsigned char *) de;
1232 :
1233 0 : if (de_len == 0) {
1234 0 : brelse(bh);
1235 0 : bh = NULL;
1236 0 : ++block;
1237 0 : offset = 0;
1238 0 : continue;
1239 : }
1240 :
1241 0 : block_saved = block;
1242 0 : offset_saved = offset;
1243 0 : offset += de_len;
1244 :
1245 : /* Make sure we have a full directory entry */
1246 0 : if (offset >= bufsize) {
1247 0 : int slop = bufsize - offset + de_len;
1248 0 : if (!tmpde) {
1249 0 : tmpde = kmalloc(256, GFP_KERNEL);
1250 0 : if (!tmpde)
1251 0 : goto out_nomem;
1252 : }
1253 0 : memcpy(tmpde, de, slop);
1254 0 : offset &= bufsize - 1;
1255 0 : block++;
1256 0 : brelse(bh);
1257 0 : bh = NULL;
1258 0 : if (offset) {
1259 0 : bh = sb_bread(inode->i_sb, block);
1260 0 : if (!bh)
1261 0 : goto out_noread;
1262 0 : memcpy((void *)tmpde+slop, bh->b_data, offset);
1263 : }
1264 : de = tmpde;
1265 : }
1266 :
1267 0 : inode->i_size += isonum_733(de->size);
1268 0 : if (i == 1) {
1269 0 : ei->i_next_section_block = block_saved;
1270 0 : ei->i_next_section_offset = offset_saved;
1271 : }
1272 :
1273 0 : more_entries = de->flags[-high_sierra] & 0x80;
1274 :
1275 0 : i++;
1276 0 : if (i > 100)
1277 0 : goto out_toomany;
1278 0 : } while (more_entries);
1279 0 : out:
1280 0 : kfree(tmpde);
1281 0 : if (bh)
1282 0 : brelse(bh);
1283 : return 0;
1284 :
1285 0 : out_nomem:
1286 0 : if (bh)
1287 0 : brelse(bh);
1288 : return -ENOMEM;
1289 :
1290 0 : out_noread:
1291 0 : printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1292 0 : kfree(tmpde);
1293 0 : return -EIO;
1294 :
1295 0 : out_toomany:
1296 0 : printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1297 : "isofs_read_level3_size: inode=%lu\n",
1298 : __func__, inode->i_ino);
1299 0 : goto out;
1300 : }
1301 :
1302 0 : static int isofs_read_inode(struct inode *inode, int relocated)
1303 : {
1304 0 : struct super_block *sb = inode->i_sb;
1305 0 : struct isofs_sb_info *sbi = ISOFS_SB(sb);
1306 0 : unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1307 0 : unsigned long block;
1308 0 : int high_sierra = sbi->s_high_sierra;
1309 0 : struct buffer_head *bh;
1310 0 : struct iso_directory_record *de;
1311 0 : struct iso_directory_record *tmpde = NULL;
1312 0 : unsigned int de_len;
1313 0 : unsigned long offset;
1314 0 : struct iso_inode_info *ei = ISOFS_I(inode);
1315 0 : int ret = -EIO;
1316 :
1317 0 : block = ei->i_iget5_block;
1318 0 : bh = sb_bread(inode->i_sb, block);
1319 0 : if (!bh)
1320 0 : goto out_badread;
1321 :
1322 0 : offset = ei->i_iget5_offset;
1323 :
1324 0 : de = (struct iso_directory_record *) (bh->b_data + offset);
1325 0 : de_len = *(unsigned char *) de;
1326 :
1327 0 : if (offset + de_len > bufsize) {
1328 0 : int frag1 = bufsize - offset;
1329 :
1330 0 : tmpde = kmalloc(de_len, GFP_KERNEL);
1331 0 : if (!tmpde) {
1332 0 : ret = -ENOMEM;
1333 0 : goto fail;
1334 : }
1335 0 : memcpy(tmpde, bh->b_data + offset, frag1);
1336 0 : brelse(bh);
1337 0 : bh = sb_bread(inode->i_sb, ++block);
1338 0 : if (!bh)
1339 0 : goto out_badread;
1340 0 : memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1341 0 : de = tmpde;
1342 : }
1343 :
1344 0 : inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1345 : ei->i_iget5_offset,
1346 0 : ISOFS_BUFFER_BITS(inode));
1347 :
1348 : /* Assume it is a normal-format file unless told otherwise */
1349 0 : ei->i_file_format = isofs_file_normal;
1350 :
1351 0 : if (de->flags[-high_sierra] & 2) {
1352 0 : if (sbi->s_dmode != ISOFS_INVALID_MODE)
1353 0 : inode->i_mode = S_IFDIR | sbi->s_dmode;
1354 : else
1355 0 : inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1356 0 : set_nlink(inode, 1); /*
1357 : * Set to 1. We know there are 2, but
1358 : * the find utility tries to optimize
1359 : * if it is 2, and it screws up. It is
1360 : * easier to give 1 which tells find to
1361 : * do it the hard way.
1362 : */
1363 : } else {
1364 0 : if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1365 0 : inode->i_mode = S_IFREG | sbi->s_fmode;
1366 : } else {
1367 : /*
1368 : * Set default permissions: r-x for all. The disc
1369 : * could be shared with DOS machines so virtually
1370 : * anything could be a valid executable.
1371 : */
1372 0 : inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1373 : }
1374 0 : set_nlink(inode, 1);
1375 : }
1376 0 : inode->i_uid = sbi->s_uid;
1377 0 : inode->i_gid = sbi->s_gid;
1378 0 : inode->i_blocks = 0;
1379 :
1380 0 : ei->i_format_parm[0] = 0;
1381 0 : ei->i_format_parm[1] = 0;
1382 0 : ei->i_format_parm[2] = 0;
1383 :
1384 0 : ei->i_section_size = isonum_733(de->size);
1385 0 : if (de->flags[-high_sierra] & 0x80) {
1386 0 : ret = isofs_read_level3_size(inode);
1387 0 : if (ret < 0)
1388 0 : goto fail;
1389 0 : ret = -EIO;
1390 : } else {
1391 0 : ei->i_next_section_block = 0;
1392 0 : ei->i_next_section_offset = 0;
1393 0 : inode->i_size = isonum_733(de->size);
1394 : }
1395 :
1396 : /*
1397 : * Some dipshit decided to store some other bit of information
1398 : * in the high byte of the file length. Truncate size in case
1399 : * this CDROM was mounted with the cruft option.
1400 : */
1401 :
1402 0 : if (sbi->s_cruft)
1403 0 : inode->i_size &= 0x00ffffff;
1404 :
1405 0 : if (de->interleave[0]) {
1406 0 : printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1407 0 : inode->i_size = 0;
1408 : }
1409 :
1410 : /* I have no idea what file_unit_size is used for, so
1411 : we will flag it for now */
1412 0 : if (de->file_unit_size[0] != 0) {
1413 0 : printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1414 : inode->i_ino);
1415 : }
1416 :
1417 : /* I have no idea what other flag bits are used for, so
1418 : we will flag it for now */
1419 : #ifdef DEBUG
1420 : if((de->flags[-high_sierra] & ~2)!= 0){
1421 : printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1422 : "(%ld %x).\n",
1423 : inode->i_ino, de->flags[-high_sierra]);
1424 : }
1425 : #endif
1426 :
1427 0 : inode->i_mtime.tv_sec =
1428 0 : inode->i_atime.tv_sec =
1429 0 : inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1430 0 : inode->i_mtime.tv_nsec =
1431 0 : inode->i_atime.tv_nsec =
1432 0 : inode->i_ctime.tv_nsec = 0;
1433 :
1434 0 : ei->i_first_extent = (isonum_733(de->extent) +
1435 0 : isonum_711(de->ext_attr_length));
1436 :
1437 : /* Set the number of blocks for stat() - should be done before RR */
1438 0 : inode->i_blocks = (inode->i_size + 511) >> 9;
1439 :
1440 : /*
1441 : * Now test for possible Rock Ridge extensions which will override
1442 : * some of these numbers in the inode structure.
1443 : */
1444 :
1445 0 : if (!high_sierra) {
1446 0 : parse_rock_ridge_inode(de, inode, relocated);
1447 : /* if we want uid/gid set, override the rock ridge setting */
1448 0 : if (sbi->s_uid_set)
1449 0 : inode->i_uid = sbi->s_uid;
1450 0 : if (sbi->s_gid_set)
1451 0 : inode->i_gid = sbi->s_gid;
1452 : }
1453 : /* Now set final access rights if overriding rock ridge setting */
1454 0 : if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1455 0 : sbi->s_dmode != ISOFS_INVALID_MODE)
1456 0 : inode->i_mode = S_IFDIR | sbi->s_dmode;
1457 0 : if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1458 0 : sbi->s_fmode != ISOFS_INVALID_MODE)
1459 0 : inode->i_mode = S_IFREG | sbi->s_fmode;
1460 :
1461 : /* Install the inode operations vector */
1462 0 : if (S_ISREG(inode->i_mode)) {
1463 0 : inode->i_fop = &generic_ro_fops;
1464 0 : switch (ei->i_file_format) {
1465 : #ifdef CONFIG_ZISOFS
1466 : case isofs_file_compressed:
1467 : inode->i_data.a_ops = &zisofs_aops;
1468 : break;
1469 : #endif
1470 : default:
1471 0 : inode->i_data.a_ops = &isofs_aops;
1472 0 : break;
1473 : }
1474 0 : } else if (S_ISDIR(inode->i_mode)) {
1475 0 : inode->i_op = &isofs_dir_inode_operations;
1476 0 : inode->i_fop = &isofs_dir_operations;
1477 0 : } else if (S_ISLNK(inode->i_mode)) {
1478 0 : inode->i_op = &page_symlink_inode_operations;
1479 0 : inode_nohighmem(inode);
1480 0 : inode->i_data.a_ops = &isofs_symlink_aops;
1481 : } else
1482 : /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1483 0 : init_special_inode(inode, inode->i_mode, inode->i_rdev);
1484 :
1485 : ret = 0;
1486 0 : out:
1487 0 : kfree(tmpde);
1488 0 : if (bh)
1489 0 : brelse(bh);
1490 0 : return ret;
1491 :
1492 0 : out_badread:
1493 0 : printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1494 0 : fail:
1495 0 : goto out;
1496 : }
1497 :
1498 : struct isofs_iget5_callback_data {
1499 : unsigned long block;
1500 : unsigned long offset;
1501 : };
1502 :
1503 0 : static int isofs_iget5_test(struct inode *ino, void *data)
1504 : {
1505 0 : struct iso_inode_info *i = ISOFS_I(ino);
1506 0 : struct isofs_iget5_callback_data *d =
1507 : (struct isofs_iget5_callback_data*)data;
1508 0 : return (i->i_iget5_block == d->block)
1509 0 : && (i->i_iget5_offset == d->offset);
1510 : }
1511 :
1512 0 : static int isofs_iget5_set(struct inode *ino, void *data)
1513 : {
1514 0 : struct iso_inode_info *i = ISOFS_I(ino);
1515 0 : struct isofs_iget5_callback_data *d =
1516 : (struct isofs_iget5_callback_data*)data;
1517 0 : i->i_iget5_block = d->block;
1518 0 : i->i_iget5_offset = d->offset;
1519 0 : return 0;
1520 : }
1521 :
1522 : /* Store, in the inode's containing structure, the block and block
1523 : * offset that point to the underlying meta-data for the inode. The
1524 : * code below is otherwise similar to the iget() code in
1525 : * include/linux/fs.h */
1526 0 : struct inode *__isofs_iget(struct super_block *sb,
1527 : unsigned long block,
1528 : unsigned long offset,
1529 : int relocated)
1530 : {
1531 0 : unsigned long hashval;
1532 0 : struct inode *inode;
1533 0 : struct isofs_iget5_callback_data data;
1534 0 : long ret;
1535 :
1536 0 : if (offset >= 1ul << sb->s_blocksize_bits)
1537 0 : return ERR_PTR(-EINVAL);
1538 :
1539 0 : data.block = block;
1540 0 : data.offset = offset;
1541 :
1542 0 : hashval = (block << sb->s_blocksize_bits) | offset;
1543 :
1544 0 : inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1545 : &isofs_iget5_set, &data);
1546 :
1547 0 : if (!inode)
1548 0 : return ERR_PTR(-ENOMEM);
1549 :
1550 0 : if (inode->i_state & I_NEW) {
1551 0 : ret = isofs_read_inode(inode, relocated);
1552 0 : if (ret < 0) {
1553 0 : iget_failed(inode);
1554 0 : inode = ERR_PTR(ret);
1555 : } else {
1556 0 : unlock_new_inode(inode);
1557 : }
1558 : }
1559 :
1560 : return inode;
1561 : }
1562 :
1563 0 : static struct dentry *isofs_mount(struct file_system_type *fs_type,
1564 : int flags, const char *dev_name, void *data)
1565 : {
1566 0 : return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1567 : }
1568 :
1569 : static struct file_system_type iso9660_fs_type = {
1570 : .owner = THIS_MODULE,
1571 : .name = "iso9660",
1572 : .mount = isofs_mount,
1573 : .kill_sb = kill_block_super,
1574 : .fs_flags = FS_REQUIRES_DEV,
1575 : };
1576 : MODULE_ALIAS_FS("iso9660");
1577 : MODULE_ALIAS("iso9660");
1578 :
1579 1 : static int __init init_iso9660_fs(void)
1580 : {
1581 1 : int err = init_inodecache();
1582 1 : if (err)
1583 0 : goto out;
1584 : #ifdef CONFIG_ZISOFS
1585 : err = zisofs_init();
1586 : if (err)
1587 : goto out1;
1588 : #endif
1589 1 : err = register_filesystem(&iso9660_fs_type);
1590 1 : if (err)
1591 0 : goto out2;
1592 : return 0;
1593 0 : out2:
1594 : #ifdef CONFIG_ZISOFS
1595 : zisofs_cleanup();
1596 : out1:
1597 : #endif
1598 0 : destroy_inodecache();
1599 : out:
1600 : return err;
1601 : }
1602 :
1603 0 : static void __exit exit_iso9660_fs(void)
1604 : {
1605 0 : unregister_filesystem(&iso9660_fs_type);
1606 : #ifdef CONFIG_ZISOFS
1607 : zisofs_cleanup();
1608 : #endif
1609 0 : destroy_inodecache();
1610 0 : }
1611 :
1612 : module_init(init_iso9660_fs)
1613 : module_exit(exit_iso9660_fs)
1614 : MODULE_LICENSE("GPL");
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