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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
34#define MAX_TZ_OFFSET (52*15*60)
35
36#define BEQUIET
37
38static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
39static int isofs_dentry_cmpi(const struct dentry *dentry,
40 unsigned int len, const char *str, const struct qstr *name);
41
42#ifdef CONFIG_JOLIET
43static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
44static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
45static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
46 unsigned int len, const char *str, const struct qstr *name);
47static int isofs_dentry_cmp_ms(const struct dentry *dentry,
48 unsigned int len, const char *str, const struct qstr *name);
49#endif
50
51static void isofs_put_super(struct super_block *sb)
52{
53 struct isofs_sb_info *sbi = ISOFS_SB(sb);
54
55#ifdef CONFIG_JOLIET
56 unload_nls(sbi->s_nls_iocharset);
57#endif
58
59 kfree(sbi);
60 sb->s_fs_info = NULL;
61 return;
62}
63
64static int isofs_read_inode(struct inode *, int relocated);
65static int isofs_statfs (struct dentry *, struct kstatfs *);
66static int isofs_show_options(struct seq_file *, struct dentry *);
67
68static struct kmem_cache *isofs_inode_cachep;
69
70static struct inode *isofs_alloc_inode(struct super_block *sb)
71{
72 struct iso_inode_info *ei;
73 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
74 if (!ei)
75 return NULL;
76 return &ei->vfs_inode;
77}
78
79static void isofs_free_inode(struct inode *inode)
80{
81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
82}
83
84static void init_once(void *foo)
85{
86 struct iso_inode_info *ei = foo;
87
88 inode_init_once(&ei->vfs_inode);
89}
90
91static int __init init_inodecache(void)
92{
93 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 if (!isofs_inode_cachep)
99 return -ENOMEM;
100 return 0;
101}
102
103static void destroy_inodecache(void)
104{
105
106
107
108
109 rcu_barrier();
110 kmem_cache_destroy(isofs_inode_cachep);
111}
112
113static int isofs_remount(struct super_block *sb, int *flags, char *data)
114{
115 sync_filesystem(sb);
116 if (!(*flags & SB_RDONLY))
117 return -EROFS;
118 return 0;
119}
120
121static 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
131static 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
148struct 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
168 s32 session;
169 s32 sbsector;
170};
171
172
173
174
175static int
176isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
177{
178 const char *name;
179 int len;
180 char c;
181 unsigned long hash;
182
183 len = qstr->len;
184 name = qstr->name;
185 if (ms) {
186 while (len && name[len-1] == '.')
187 len--;
188 }
189
190 hash = init_name_hash(dentry);
191 while (len--) {
192 c = tolower(*name++);
193 hash = partial_name_hash(c, hash);
194 }
195 qstr->hash = end_name_hash(hash);
196
197 return 0;
198}
199
200
201
202
203static int isofs_dentry_cmp_common(
204 unsigned int len, const char *str,
205 const struct qstr *name, int ms, int ci)
206{
207 int alen, blen;
208
209
210 alen = name->len;
211 blen = len;
212 if (ms) {
213 while (alen && name->name[alen-1] == '.')
214 alen--;
215 while (blen && str[blen-1] == '.')
216 blen--;
217 }
218 if (alen == blen) {
219 if (ci) {
220 if (strncasecmp(name->name, str, alen) == 0)
221 return 0;
222 } else {
223 if (strncmp(name->name, str, alen) == 0)
224 return 0;
225 }
226 }
227 return 1;
228}
229
230static int
231isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
232{
233 return isofs_hashi_common(dentry, qstr, 0);
234}
235
236static int
237isofs_dentry_cmpi(const struct dentry *dentry,
238 unsigned int len, const char *str, const struct qstr *name)
239{
240 return isofs_dentry_cmp_common(len, str, name, 0, 1);
241}
242
243#ifdef CONFIG_JOLIET
244
245
246
247static int
248isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
249{
250 const char *name;
251 int len;
252
253 len = qstr->len;
254 name = qstr->name;
255 if (ms) {
256 while (len && name[len-1] == '.')
257 len--;
258 }
259
260 qstr->hash = full_name_hash(dentry, name, len);
261
262 return 0;
263}
264
265static int
266isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
267{
268 return isofs_hash_common(dentry, qstr, 1);
269}
270
271static int
272isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
273{
274 return isofs_hashi_common(dentry, qstr, 1);
275}
276
277static int
278isofs_dentry_cmp_ms(const struct dentry *dentry,
279 unsigned int len, const char *str, const struct qstr *name)
280{
281 return isofs_dentry_cmp_common(len, str, name, 1, 0);
282}
283
284static int
285isofs_dentry_cmpi_ms(const struct dentry *dentry,
286 unsigned int len, const char *str, const struct qstr *name)
287{
288 return isofs_dentry_cmp_common(len, str, name, 1, 1);
289}
290#endif
291
292enum {
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
299static 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
338static int parse_options(char *options, struct iso9660_options *popt)
339{
340 char *p;
341 int option;
342
343 popt->map = 'n';
344 popt->rock = 1;
345 popt->joliet = 1;
346 popt->cruft = 0;
347 popt->hide = 0;
348 popt->showassoc = 0;
349 popt->check = 'u';
350 popt->nocompress = 0;
351 popt->blocksize = 1024;
352 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
353 popt->uid_set = 0;
354 popt->gid_set = 0;
355 popt->gid = GLOBAL_ROOT_GID;
356 popt->uid = GLOBAL_ROOT_UID;
357 popt->iocharset = NULL;
358 popt->utf8 = 0;
359 popt->overriderockperm = 0;
360 popt->session=-1;
361 popt->sbsector=-1;
362 if (!options)
363 return 1;
364
365 while ((p = strsep(&options, ",")) != NULL) {
366 int token;
367 substring_t args[MAX_OPT_ARGS];
368 unsigned n;
369
370 if (!*p)
371 continue;
372
373 token = match_token(p, tokens, args);
374 switch (token) {
375 case Opt_norock:
376 popt->rock = 0;
377 break;
378 case Opt_nojoliet:
379 popt->joliet = 0;
380 break;
381 case Opt_hide:
382 popt->hide = 1;
383 break;
384 case Opt_unhide:
385 case Opt_showassoc:
386 popt->showassoc = 1;
387 break;
388 case Opt_cruft:
389 popt->cruft = 1;
390 break;
391 case Opt_utf8:
392 popt->utf8 = 1;
393 break;
394#ifdef CONFIG_JOLIET
395 case Opt_iocharset:
396 kfree(popt->iocharset);
397 popt->iocharset = match_strdup(&args[0]);
398 if (!popt->iocharset)
399 return 0;
400 break;
401#endif
402 case Opt_map_a:
403 popt->map = 'a';
404 break;
405 case Opt_map_o:
406 popt->map = 'o';
407 break;
408 case Opt_map_n:
409 popt->map = 'n';
410 break;
411 case Opt_session:
412 if (match_int(&args[0], &option))
413 return 0;
414 n = option;
415
416
417
418
419 if (n >= 99)
420 return 0;
421 popt->session = n + 1;
422 break;
423 case Opt_sb:
424 if (match_int(&args[0], &option))
425 return 0;
426 popt->sbsector = option;
427 break;
428 case Opt_check_r:
429 popt->check = 'r';
430 break;
431 case Opt_check_s:
432 popt->check = 's';
433 break;
434 case Opt_ignore:
435 break;
436 case Opt_uid:
437 if (match_int(&args[0], &option))
438 return 0;
439 popt->uid = make_kuid(current_user_ns(), option);
440 if (!uid_valid(popt->uid))
441 return 0;
442 popt->uid_set = 1;
443 break;
444 case Opt_gid:
445 if (match_int(&args[0], &option))
446 return 0;
447 popt->gid = make_kgid(current_user_ns(), option);
448 if (!gid_valid(popt->gid))
449 return 0;
450 popt->gid_set = 1;
451 break;
452 case Opt_mode:
453 if (match_int(&args[0], &option))
454 return 0;
455 popt->fmode = option;
456 break;
457 case Opt_dmode:
458 if (match_int(&args[0], &option))
459 return 0;
460 popt->dmode = option;
461 break;
462 case Opt_overriderockperm:
463 popt->overriderockperm = 1;
464 break;
465 case Opt_block:
466 if (match_int(&args[0], &option))
467 return 0;
468 n = option;
469 if (n != 512 && n != 1024 && n != 2048)
470 return 0;
471 popt->blocksize = n;
472 break;
473 case Opt_nocompress:
474 popt->nocompress = 1;
475 break;
476 default:
477 return 0;
478 }
479 }
480 return 1;
481}
482
483
484
485
486static int isofs_show_options(struct seq_file *m, struct dentry *root)
487{
488 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
489
490 if (!sbi->s_rock) seq_puts(m, ",norock");
491 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
492 if (sbi->s_cruft) seq_puts(m, ",cruft");
493 if (sbi->s_hide) seq_puts(m, ",hide");
494 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
495 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
496 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
497 if (sbi->s_utf8) seq_puts(m, ",utf8");
498
499 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
500 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
501 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
502 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
503
504 if (root->d_sb->s_blocksize != 1024)
505 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
506
507 if (sbi->s_uid_set)
508 seq_printf(m, ",uid=%u",
509 from_kuid_munged(&init_user_ns, sbi->s_uid));
510 if (sbi->s_gid_set)
511 seq_printf(m, ",gid=%u",
512 from_kgid_munged(&init_user_ns, sbi->s_gid));
513
514 if (sbi->s_dmode != ISOFS_INVALID_MODE)
515 seq_printf(m, ",dmode=%o", sbi->s_dmode);
516 if (sbi->s_fmode != ISOFS_INVALID_MODE)
517 seq_printf(m, ",fmode=%o", sbi->s_fmode);
518
519#ifdef CONFIG_JOLIET
520 if (sbi->s_nls_iocharset &&
521 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
522 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
523#endif
524 return 0;
525}
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543#define WE_OBEY_THE_WRITTEN_STANDARDS 1
544
545static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
546{
547 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
548 unsigned int vol_desc_start = 0;
549
550 if (session > 0) {
551 struct cdrom_tocentry te;
552
553 if (!cdi)
554 return 0;
555
556 te.cdte_track = session;
557 te.cdte_format = CDROM_LBA;
558 if (cdrom_read_tocentry(cdi, &te) == 0) {
559 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
560 session, te.cdte_addr.lba,
561 te.cdte_ctrl & CDROM_DATA_TRACK);
562 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
563 return te.cdte_addr.lba;
564 }
565
566 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
567 }
568
569 if (cdi) {
570 struct cdrom_multisession ms_info;
571
572 ms_info.addr_format = CDROM_LBA;
573 if (cdrom_multisession(cdi, &ms_info) == 0) {
574#if WE_OBEY_THE_WRITTEN_STANDARDS
575
576 if (ms_info.xa_flag)
577#endif
578 vol_desc_start = ms_info.addr.lba;
579 }
580 }
581
582 return vol_desc_start;
583}
584
585
586
587
588
589
590
591
592static bool rootdir_empty(struct super_block *sb, unsigned long block)
593{
594 int offset = 0, files = 0, de_len;
595 struct iso_directory_record *de;
596 struct buffer_head *bh;
597
598 bh = sb_bread(sb, block);
599 if (!bh)
600 return true;
601 while (files < 3) {
602 de = (struct iso_directory_record *) (bh->b_data + offset);
603 de_len = *(unsigned char *) de;
604 if (de_len == 0)
605 break;
606 files++;
607 offset += de_len;
608 }
609 brelse(bh);
610 return files < 3;
611}
612
613
614
615
616
617
618
619static int isofs_fill_super(struct super_block *s, void *data, int silent)
620{
621 struct buffer_head *bh = NULL, *pri_bh = NULL;
622 struct hs_primary_descriptor *h_pri = NULL;
623 struct iso_primary_descriptor *pri = NULL;
624 struct iso_supplementary_descriptor *sec = NULL;
625 struct iso_directory_record *rootp;
626 struct inode *inode;
627 struct iso9660_options opt;
628 struct isofs_sb_info *sbi;
629 unsigned long first_data_zone;
630 int joliet_level = 0;
631 int iso_blknum, block;
632 int orig_zonesize;
633 int table, error = -EINVAL;
634 unsigned int vol_desc_start;
635
636 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
637 if (!sbi)
638 return -ENOMEM;
639 s->s_fs_info = sbi;
640
641 if (!parse_options((char *)data, &opt))
642 goto out_freesbi;
643
644
645
646
647
648
649
650
651
652
653 if (bdev_logical_block_size(s->s_bdev) > 2048) {
654 printk(KERN_WARNING
655 "ISOFS: unsupported/invalid hardware sector size %d\n",
656 bdev_logical_block_size(s->s_bdev));
657 goto out_freesbi;
658 }
659 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
660
661 sbi->s_high_sierra = 0;
662 sbi->s_session = opt.session;
663 sbi->s_sbsector = opt.sbsector;
664
665 vol_desc_start = (opt.sbsector != -1) ?
666 opt.sbsector : isofs_get_last_session(s,opt.session);
667
668 for (iso_blknum = vol_desc_start+16;
669 iso_blknum < vol_desc_start+100; iso_blknum++) {
670 struct hs_volume_descriptor *hdp;
671 struct iso_volume_descriptor *vdp;
672
673 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
674 if (!(bh = sb_bread(s, block)))
675 goto out_no_read;
676
677 vdp = (struct iso_volume_descriptor *)bh->b_data;
678 hdp = (struct hs_volume_descriptor *)bh->b_data;
679
680
681
682
683
684
685 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
686 if (isonum_711(vdp->type) == ISO_VD_END)
687 break;
688 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
689 if (!pri) {
690 pri = (struct iso_primary_descriptor *)vdp;
691
692 pri_bh = bh;
693 bh = NULL;
694 }
695 }
696#ifdef CONFIG_JOLIET
697 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
698 sec = (struct iso_supplementary_descriptor *)vdp;
699 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
700 if (opt.joliet) {
701 if (sec->escape[2] == 0x40)
702 joliet_level = 1;
703 else if (sec->escape[2] == 0x43)
704 joliet_level = 2;
705 else if (sec->escape[2] == 0x45)
706 joliet_level = 3;
707
708 printk(KERN_DEBUG "ISO 9660 Extensions: "
709 "Microsoft Joliet Level %d\n",
710 joliet_level);
711 }
712 goto root_found;
713 } else {
714
715 sec = NULL;
716 }
717 }
718#endif
719 } else {
720 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
721 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
722 goto out_freebh;
723
724 sbi->s_high_sierra = 1;
725 opt.rock = 0;
726 h_pri = (struct hs_primary_descriptor *)vdp;
727 goto root_found;
728 }
729 }
730
731
732
733 brelse(bh);
734 bh = NULL;
735 }
736
737
738
739
740 if (!pri)
741 goto out_unknown_format;
742 brelse(bh);
743 bh = pri_bh;
744 pri_bh = NULL;
745
746root_found:
747
748 if (!sb_rdonly(s)) {
749 error = -EACCES;
750 goto out_freebh;
751 }
752
753 if (joliet_level && (!pri || !opt.rock)) {
754
755
756
757 pri = (struct iso_primary_descriptor *) sec;
758 }
759
760 if(sbi->s_high_sierra){
761 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
762 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
763 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
764 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
765 } else {
766 if (!pri)
767 goto out_freebh;
768 rootp = (struct iso_directory_record *) pri->root_directory_record;
769 sbi->s_nzones = isonum_733(pri->volume_space_size);
770 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
771 sbi->s_max_size = isonum_733(pri->volume_space_size);
772 }
773
774 sbi->s_ninodes = 0;
775
776 orig_zonesize = sbi->s_log_zone_size;
777
778
779
780
781
782
783
784 if (orig_zonesize < opt.blocksize)
785 goto out_bad_size;
786
787
788 switch (sbi->s_log_zone_size) {
789 case 512: sbi->s_log_zone_size = 9; break;
790 case 1024: sbi->s_log_zone_size = 10; break;
791 case 2048: sbi->s_log_zone_size = 11; break;
792
793 default:
794 goto out_bad_zone_size;
795 }
796
797 s->s_magic = ISOFS_SUPER_MAGIC;
798
799
800
801
802
803 s->s_maxbytes = 0x80000000000LL;
804
805
806 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
807 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
808
809
810
811
812 first_data_zone = isonum_733(rootp->extent) +
813 isonum_711(rootp->ext_attr_length);
814 sbi->s_firstdatazone = first_data_zone;
815#ifndef BEQUIET
816 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
817 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
818 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
819 if(sbi->s_high_sierra)
820 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
821#endif
822
823
824
825
826
827
828
829
830
831 if (joliet_level) {
832 pri = (struct iso_primary_descriptor *) sec;
833 rootp = (struct iso_directory_record *)
834 pri->root_directory_record;
835 first_data_zone = isonum_733(rootp->extent) +
836 isonum_711(rootp->ext_attr_length);
837 }
838
839
840
841
842
843 brelse(pri_bh);
844 brelse(bh);
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863 sb_set_blocksize(s, orig_zonesize);
864
865 sbi->s_nls_iocharset = NULL;
866
867#ifdef CONFIG_JOLIET
868 if (joliet_level && opt.utf8 == 0) {
869 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
870 sbi->s_nls_iocharset = load_nls(p);
871 if (! sbi->s_nls_iocharset) {
872
873 if (opt.iocharset)
874 goto out_freesbi;
875 sbi->s_nls_iocharset = load_nls_default();
876 }
877 }
878#endif
879 s->s_op = &isofs_sops;
880 s->s_export_op = &isofs_export_ops;
881 sbi->s_mapping = opt.map;
882 sbi->s_rock = (opt.rock ? 2 : 0);
883 sbi->s_rock_offset = -1;
884 sbi->s_cruft = opt.cruft;
885 sbi->s_hide = opt.hide;
886 sbi->s_showassoc = opt.showassoc;
887 sbi->s_uid = opt.uid;
888 sbi->s_gid = opt.gid;
889 sbi->s_uid_set = opt.uid_set;
890 sbi->s_gid_set = opt.gid_set;
891 sbi->s_utf8 = opt.utf8;
892 sbi->s_nocompress = opt.nocompress;
893 sbi->s_overriderockperm = opt.overriderockperm;
894
895
896
897
898
899 if (opt.fmode != ISOFS_INVALID_MODE)
900 sbi->s_fmode = opt.fmode & 0777;
901 else
902 sbi->s_fmode = ISOFS_INVALID_MODE;
903 if (opt.dmode != ISOFS_INVALID_MODE)
904 sbi->s_dmode = opt.dmode & 0777;
905 else
906 sbi->s_dmode = ISOFS_INVALID_MODE;
907
908
909
910
911
912
913 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
914 if (IS_ERR(inode))
915 goto out_no_root;
916
917
918
919
920
921 if (sbi->s_rock == 1 && joliet_level &&
922 rootdir_empty(s, sbi->s_firstdatazone)) {
923 printk(KERN_NOTICE
924 "ISOFS: primary root directory is empty. "
925 "Disabling Rock Ridge and switching to Joliet.");
926 sbi->s_rock = 0;
927 }
928
929
930
931
932
933
934
935
936
937 if (sbi->s_rock == 1) {
938 joliet_level = 0;
939 } else if (joliet_level) {
940 sbi->s_rock = 0;
941 if (sbi->s_firstdatazone != first_data_zone) {
942 sbi->s_firstdatazone = first_data_zone;
943 printk(KERN_DEBUG
944 "ISOFS: changing to secondary root\n");
945 iput(inode);
946 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
947 if (IS_ERR(inode))
948 goto out_no_root;
949 }
950 }
951
952 if (opt.check == 'u') {
953
954 if (joliet_level)
955 opt.check = 'r';
956 else
957 opt.check = 's';
958 }
959 sbi->s_joliet_level = joliet_level;
960
961
962 if (!S_ISDIR(inode->i_mode)) {
963 printk(KERN_WARNING
964 "isofs_fill_super: root inode is not a directory. "
965 "Corrupted media?\n");
966 goto out_iput;
967 }
968
969 table = 0;
970 if (joliet_level)
971 table += 2;
972 if (opt.check == 'r')
973 table++;
974 sbi->s_check = opt.check;
975
976 if (table)
977 s->s_d_op = &isofs_dentry_ops[table - 1];
978
979
980 s->s_root = d_make_root(inode);
981 if (!(s->s_root)) {
982 error = -ENOMEM;
983 goto out_no_inode;
984 }
985
986 kfree(opt.iocharset);
987
988 return 0;
989
990
991
992
993out_iput:
994 iput(inode);
995 goto out_no_inode;
996out_no_root:
997 error = PTR_ERR(inode);
998 if (error != -ENOMEM)
999 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
1000out_no_inode:
1001#ifdef CONFIG_JOLIET
1002 unload_nls(sbi->s_nls_iocharset);
1003#endif
1004 goto out_freesbi;
1005out_no_read:
1006 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1007 __func__, s->s_id, iso_blknum, block);
1008 goto out_freebh;
1009out_bad_zone_size:
1010 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1011 sbi->s_log_zone_size);
1012 goto out_freebh;
1013out_bad_size:
1014 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1015 orig_zonesize, opt.blocksize);
1016 goto out_freebh;
1017out_unknown_format:
1018 if (!silent)
1019 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1020
1021out_freebh:
1022 brelse(bh);
1023 brelse(pri_bh);
1024out_freesbi:
1025 kfree(opt.iocharset);
1026 kfree(sbi);
1027 s->s_fs_info = NULL;
1028 return error;
1029}
1030
1031static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1032{
1033 struct super_block *sb = dentry->d_sb;
1034 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1035
1036 buf->f_type = ISOFS_SUPER_MAGIC;
1037 buf->f_bsize = sb->s_blocksize;
1038 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1039 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1040 buf->f_bfree = 0;
1041 buf->f_bavail = 0;
1042 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1043 buf->f_ffree = 0;
1044 buf->f_fsid.val[0] = (u32)id;
1045 buf->f_fsid.val[1] = (u32)(id >> 32);
1046 buf->f_namelen = NAME_MAX;
1047 return 0;
1048}
1049
1050
1051
1052
1053
1054
1055int isofs_get_blocks(struct inode *inode, sector_t iblock,
1056 struct buffer_head **bh, unsigned long nblocks)
1057{
1058 unsigned long b_off = iblock;
1059 unsigned offset, sect_size;
1060 unsigned int firstext;
1061 unsigned long nextblk, nextoff;
1062 int section, rv, error;
1063 struct iso_inode_info *ei = ISOFS_I(inode);
1064
1065 error = -EIO;
1066 rv = 0;
1067 if (iblock != b_off) {
1068 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1069 goto abort;
1070 }
1071
1072
1073 offset = 0;
1074 firstext = ei->i_first_extent;
1075 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1076 nextblk = ei->i_next_section_block;
1077 nextoff = ei->i_next_section_offset;
1078 section = 0;
1079
1080 while (nblocks) {
1081
1082
1083
1084
1085
1086
1087
1088 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1089 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1090 __func__, b_off,
1091 (unsigned long long)inode->i_size);
1092 goto abort;
1093 }
1094
1095
1096
1097
1098
1099 while (nextblk && (b_off >= (offset + sect_size))) {
1100 struct inode *ninode;
1101
1102 offset += sect_size;
1103 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1104 if (IS_ERR(ninode)) {
1105 error = PTR_ERR(ninode);
1106 goto abort;
1107 }
1108 firstext = ISOFS_I(ninode)->i_first_extent;
1109 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1110 nextblk = ISOFS_I(ninode)->i_next_section_block;
1111 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1112 iput(ninode);
1113
1114 if (++section > 100) {
1115 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1116 " aborting...\n", __func__);
1117 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1118 "nextblk=%lu nextoff=%lu\n", __func__,
1119 b_off, firstext, (unsigned) sect_size,
1120 nextblk, nextoff);
1121 goto abort;
1122 }
1123 }
1124
1125 if (*bh) {
1126 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1127 } else {
1128 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1129 if (!*bh)
1130 goto abort;
1131 }
1132 bh++;
1133 b_off++;
1134 nblocks--;
1135 rv++;
1136 }
1137
1138 error = 0;
1139abort:
1140 return rv != 0 ? rv : error;
1141}
1142
1143
1144
1145
1146static int isofs_get_block(struct inode *inode, sector_t iblock,
1147 struct buffer_head *bh_result, int create)
1148{
1149 int ret;
1150
1151 if (create) {
1152 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1153 return -EROFS;
1154 }
1155
1156 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1157 return ret < 0 ? ret : 0;
1158}
1159
1160static int isofs_bmap(struct inode *inode, sector_t block)
1161{
1162 struct buffer_head dummy;
1163 int error;
1164
1165 dummy.b_state = 0;
1166 dummy.b_blocknr = -1000;
1167 error = isofs_get_block(inode, block, &dummy, 0);
1168 if (!error)
1169 return dummy.b_blocknr;
1170 return 0;
1171}
1172
1173struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1174{
1175 sector_t blknr = isofs_bmap(inode, block);
1176 if (!blknr)
1177 return NULL;
1178 return sb_bread(inode->i_sb, blknr);
1179}
1180
1181static int isofs_readpage(struct file *file, struct page *page)
1182{
1183 return mpage_readpage(page, isofs_get_block);
1184}
1185
1186static void isofs_readahead(struct readahead_control *rac)
1187{
1188 mpage_readahead(rac, isofs_get_block);
1189}
1190
1191static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1192{
1193 return generic_block_bmap(mapping,block,isofs_get_block);
1194}
1195
1196static const struct address_space_operations isofs_aops = {
1197 .readpage = isofs_readpage,
1198 .readahead = isofs_readahead,
1199 .bmap = _isofs_bmap
1200};
1201
1202static int isofs_read_level3_size(struct inode *inode)
1203{
1204 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1205 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1206 struct buffer_head *bh = NULL;
1207 unsigned long block, offset, block_saved, offset_saved;
1208 int i = 0;
1209 int more_entries = 0;
1210 struct iso_directory_record *tmpde = NULL;
1211 struct iso_inode_info *ei = ISOFS_I(inode);
1212
1213 inode->i_size = 0;
1214
1215
1216
1217
1218 ei->i_next_section_block = 0;
1219 ei->i_next_section_offset = 0;
1220
1221 block = ei->i_iget5_block;
1222 offset = ei->i_iget5_offset;
1223
1224 do {
1225 struct iso_directory_record *de;
1226 unsigned int de_len;
1227
1228 if (!bh) {
1229 bh = sb_bread(inode->i_sb, block);
1230 if (!bh)
1231 goto out_noread;
1232 }
1233 de = (struct iso_directory_record *) (bh->b_data + offset);
1234 de_len = *(unsigned char *) de;
1235
1236 if (de_len == 0) {
1237 brelse(bh);
1238 bh = NULL;
1239 ++block;
1240 offset = 0;
1241 continue;
1242 }
1243
1244 block_saved = block;
1245 offset_saved = offset;
1246 offset += de_len;
1247
1248
1249 if (offset >= bufsize) {
1250 int slop = bufsize - offset + de_len;
1251 if (!tmpde) {
1252 tmpde = kmalloc(256, GFP_KERNEL);
1253 if (!tmpde)
1254 goto out_nomem;
1255 }
1256 memcpy(tmpde, de, slop);
1257 offset &= bufsize - 1;
1258 block++;
1259 brelse(bh);
1260 bh = NULL;
1261 if (offset) {
1262 bh = sb_bread(inode->i_sb, block);
1263 if (!bh)
1264 goto out_noread;
1265 memcpy((void *)tmpde+slop, bh->b_data, offset);
1266 }
1267 de = tmpde;
1268 }
1269
1270 inode->i_size += isonum_733(de->size);
1271 if (i == 1) {
1272 ei->i_next_section_block = block_saved;
1273 ei->i_next_section_offset = offset_saved;
1274 }
1275
1276 more_entries = de->flags[-high_sierra] & 0x80;
1277
1278 i++;
1279 if (i > 100)
1280 goto out_toomany;
1281 } while (more_entries);
1282out:
1283 kfree(tmpde);
1284 if (bh)
1285 brelse(bh);
1286 return 0;
1287
1288out_nomem:
1289 if (bh)
1290 brelse(bh);
1291 return -ENOMEM;
1292
1293out_noread:
1294 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1295 kfree(tmpde);
1296 return -EIO;
1297
1298out_toomany:
1299 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1300 "isofs_read_level3_size: inode=%lu\n",
1301 __func__, inode->i_ino);
1302 goto out;
1303}
1304
1305static int isofs_read_inode(struct inode *inode, int relocated)
1306{
1307 struct super_block *sb = inode->i_sb;
1308 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1309 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1310 unsigned long block;
1311 int high_sierra = sbi->s_high_sierra;
1312 struct buffer_head *bh;
1313 struct iso_directory_record *de;
1314 struct iso_directory_record *tmpde = NULL;
1315 unsigned int de_len;
1316 unsigned long offset;
1317 struct iso_inode_info *ei = ISOFS_I(inode);
1318 int ret = -EIO;
1319
1320 block = ei->i_iget5_block;
1321 bh = sb_bread(inode->i_sb, block);
1322 if (!bh)
1323 goto out_badread;
1324
1325 offset = ei->i_iget5_offset;
1326
1327 de = (struct iso_directory_record *) (bh->b_data + offset);
1328 de_len = *(unsigned char *) de;
1329
1330 if (offset + de_len > bufsize) {
1331 int frag1 = bufsize - offset;
1332
1333 tmpde = kmalloc(de_len, GFP_KERNEL);
1334 if (!tmpde) {
1335 ret = -ENOMEM;
1336 goto fail;
1337 }
1338 memcpy(tmpde, bh->b_data + offset, frag1);
1339 brelse(bh);
1340 bh = sb_bread(inode->i_sb, ++block);
1341 if (!bh)
1342 goto out_badread;
1343 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1344 de = tmpde;
1345 }
1346
1347 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1348 ei->i_iget5_offset,
1349 ISOFS_BUFFER_BITS(inode));
1350
1351
1352 ei->i_file_format = isofs_file_normal;
1353
1354 if (de->flags[-high_sierra] & 2) {
1355 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1356 inode->i_mode = S_IFDIR | sbi->s_dmode;
1357 else
1358 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1359 set_nlink(inode, 1);
1360
1361
1362
1363
1364
1365
1366 } else {
1367 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1368 inode->i_mode = S_IFREG | sbi->s_fmode;
1369 } else {
1370
1371
1372
1373
1374
1375 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1376 }
1377 set_nlink(inode, 1);
1378 }
1379 inode->i_uid = sbi->s_uid;
1380 inode->i_gid = sbi->s_gid;
1381 inode->i_blocks = 0;
1382
1383 ei->i_format_parm[0] = 0;
1384 ei->i_format_parm[1] = 0;
1385 ei->i_format_parm[2] = 0;
1386
1387 ei->i_section_size = isonum_733(de->size);
1388 if (de->flags[-high_sierra] & 0x80) {
1389 ret = isofs_read_level3_size(inode);
1390 if (ret < 0)
1391 goto fail;
1392 ret = -EIO;
1393 } else {
1394 ei->i_next_section_block = 0;
1395 ei->i_next_section_offset = 0;
1396 inode->i_size = isonum_733(de->size);
1397 }
1398
1399
1400
1401
1402
1403
1404
1405 if (sbi->s_cruft)
1406 inode->i_size &= 0x00ffffff;
1407
1408 if (de->interleave[0]) {
1409 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1410 inode->i_size = 0;
1411 }
1412
1413
1414
1415 if (de->file_unit_size[0] != 0) {
1416 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1417 inode->i_ino);
1418 }
1419
1420
1421
1422#ifdef DEBUG
1423 if((de->flags[-high_sierra] & ~2)!= 0){
1424 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1425 "(%ld %x).\n",
1426 inode->i_ino, de->flags[-high_sierra]);
1427 }
1428#endif
1429
1430 inode->i_mtime.tv_sec =
1431 inode->i_atime.tv_sec =
1432 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1433 inode->i_mtime.tv_nsec =
1434 inode->i_atime.tv_nsec =
1435 inode->i_ctime.tv_nsec = 0;
1436
1437 ei->i_first_extent = (isonum_733(de->extent) +
1438 isonum_711(de->ext_attr_length));
1439
1440
1441 inode->i_blocks = (inode->i_size + 511) >> 9;
1442
1443
1444
1445
1446
1447
1448 if (!high_sierra) {
1449 parse_rock_ridge_inode(de, inode, relocated);
1450
1451 if (sbi->s_uid_set)
1452 inode->i_uid = sbi->s_uid;
1453 if (sbi->s_gid_set)
1454 inode->i_gid = sbi->s_gid;
1455 }
1456
1457 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1458 sbi->s_dmode != ISOFS_INVALID_MODE)
1459 inode->i_mode = S_IFDIR | sbi->s_dmode;
1460 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1461 sbi->s_fmode != ISOFS_INVALID_MODE)
1462 inode->i_mode = S_IFREG | sbi->s_fmode;
1463
1464
1465 if (S_ISREG(inode->i_mode)) {
1466 inode->i_fop = &generic_ro_fops;
1467 switch (ei->i_file_format) {
1468#ifdef CONFIG_ZISOFS
1469 case isofs_file_compressed:
1470 inode->i_data.a_ops = &zisofs_aops;
1471 break;
1472#endif
1473 default:
1474 inode->i_data.a_ops = &isofs_aops;
1475 break;
1476 }
1477 } else if (S_ISDIR(inode->i_mode)) {
1478 inode->i_op = &isofs_dir_inode_operations;
1479 inode->i_fop = &isofs_dir_operations;
1480 } else if (S_ISLNK(inode->i_mode)) {
1481 inode->i_op = &page_symlink_inode_operations;
1482 inode_nohighmem(inode);
1483 inode->i_data.a_ops = &isofs_symlink_aops;
1484 } else
1485
1486 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1487
1488 ret = 0;
1489out:
1490 kfree(tmpde);
1491 if (bh)
1492 brelse(bh);
1493 return ret;
1494
1495out_badread:
1496 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1497fail:
1498 goto out;
1499}
1500
1501struct isofs_iget5_callback_data {
1502 unsigned long block;
1503 unsigned long offset;
1504};
1505
1506static int isofs_iget5_test(struct inode *ino, void *data)
1507{
1508 struct iso_inode_info *i = ISOFS_I(ino);
1509 struct isofs_iget5_callback_data *d =
1510 (struct isofs_iget5_callback_data*)data;
1511 return (i->i_iget5_block == d->block)
1512 && (i->i_iget5_offset == d->offset);
1513}
1514
1515static int isofs_iget5_set(struct inode *ino, void *data)
1516{
1517 struct iso_inode_info *i = ISOFS_I(ino);
1518 struct isofs_iget5_callback_data *d =
1519 (struct isofs_iget5_callback_data*)data;
1520 i->i_iget5_block = d->block;
1521 i->i_iget5_offset = d->offset;
1522 return 0;
1523}
1524
1525
1526
1527
1528
1529struct inode *__isofs_iget(struct super_block *sb,
1530 unsigned long block,
1531 unsigned long offset,
1532 int relocated)
1533{
1534 unsigned long hashval;
1535 struct inode *inode;
1536 struct isofs_iget5_callback_data data;
1537 long ret;
1538
1539 if (offset >= 1ul << sb->s_blocksize_bits)
1540 return ERR_PTR(-EINVAL);
1541
1542 data.block = block;
1543 data.offset = offset;
1544
1545 hashval = (block << sb->s_blocksize_bits) | offset;
1546
1547 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1548 &isofs_iget5_set, &data);
1549
1550 if (!inode)
1551 return ERR_PTR(-ENOMEM);
1552
1553 if (inode->i_state & I_NEW) {
1554 ret = isofs_read_inode(inode, relocated);
1555 if (ret < 0) {
1556 iget_failed(inode);
1557 inode = ERR_PTR(ret);
1558 } else {
1559 unlock_new_inode(inode);
1560 }
1561 }
1562
1563 return inode;
1564}
1565
1566static struct dentry *isofs_mount(struct file_system_type *fs_type,
1567 int flags, const char *dev_name, void *data)
1568{
1569 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1570}
1571
1572static struct file_system_type iso9660_fs_type = {
1573 .owner = THIS_MODULE,
1574 .name = "iso9660",
1575 .mount = isofs_mount,
1576 .kill_sb = kill_block_super,
1577 .fs_flags = FS_REQUIRES_DEV,
1578};
1579MODULE_ALIAS_FS("iso9660");
1580MODULE_ALIAS("iso9660");
1581
1582static int __init init_iso9660_fs(void)
1583{
1584 int err = init_inodecache();
1585 if (err)
1586 goto out;
1587#ifdef CONFIG_ZISOFS
1588 err = zisofs_init();
1589 if (err)
1590 goto out1;
1591#endif
1592 err = register_filesystem(&iso9660_fs_type);
1593 if (err)
1594 goto out2;
1595 return 0;
1596out2:
1597#ifdef CONFIG_ZISOFS
1598 zisofs_cleanup();
1599out1:
1600#endif
1601 destroy_inodecache();
1602out:
1603 return err;
1604}
1605
1606static void __exit exit_iso9660_fs(void)
1607{
1608 unregister_filesystem(&iso9660_fs_type);
1609#ifdef CONFIG_ZISOFS
1610 zisofs_cleanup();
1611#endif
1612 destroy_inodecache();
1613}
1614
1615module_init(init_iso9660_fs)
1616module_exit(exit_iso9660_fs)
1617MODULE_LICENSE("GPL");
1618