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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 Mönkeberg - 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/init.h>
15#include <linux/module.h>
16
17#include <linux/slab.h>
18#include <linux/nls.h>
19#include <linux/ctype.h>
20#include <linux/statfs.h>
21#include <linux/cdrom.h>
22#include <linux/parser.h>
23#include <linux/mpage.h>
24
25#include "isofs.h"
26#include "zisofs.h"
27
28#define BEQUIET
29
30static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
31 struct qstr *qstr);
32static int isofs_hash(const struct dentry *parent, const struct inode *inode,
33 struct qstr *qstr);
34static int isofs_dentry_cmpi(const struct dentry *parent,
35 const struct inode *pinode,
36 const struct dentry *dentry, const struct inode *inode,
37 unsigned int len, const char *str, const struct qstr *name);
38static int isofs_dentry_cmp(const struct dentry *parent,
39 const struct inode *pinode,
40 const struct dentry *dentry, const struct inode *inode,
41 unsigned int len, const char *str, const struct qstr *name);
42
43#ifdef CONFIG_JOLIET
44static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
45 struct qstr *qstr);
46static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
47 struct qstr *qstr);
48static int isofs_dentry_cmpi_ms(const struct dentry *parent,
49 const struct inode *pinode,
50 const struct dentry *dentry, const struct inode *inode,
51 unsigned int len, const char *str, const struct qstr *name);
52static int isofs_dentry_cmp_ms(const struct dentry *parent,
53 const struct inode *pinode,
54 const struct dentry *dentry, const struct inode *inode,
55 unsigned int len, const char *str, const struct qstr *name);
56#endif
57
58static void isofs_put_super(struct super_block *sb)
59{
60 struct isofs_sb_info *sbi = ISOFS_SB(sb);
61
62#ifdef CONFIG_JOLIET
63 unload_nls(sbi->s_nls_iocharset);
64#endif
65
66 kfree(sbi);
67 sb->s_fs_info = NULL;
68 return;
69}
70
71static int isofs_read_inode(struct inode *);
72static int isofs_statfs (struct dentry *, struct kstatfs *);
73
74static struct kmem_cache *isofs_inode_cachep;
75
76static struct inode *isofs_alloc_inode(struct super_block *sb)
77{
78 struct iso_inode_info *ei;
79 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
80 if (!ei)
81 return NULL;
82 return &ei->vfs_inode;
83}
84
85static void isofs_i_callback(struct rcu_head *head)
86{
87 struct inode *inode = container_of(head, struct inode, i_rcu);
88 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
89}
90
91static void isofs_destroy_inode(struct inode *inode)
92{
93 call_rcu(&inode->i_rcu, isofs_i_callback);
94}
95
96static void init_once(void *foo)
97{
98 struct iso_inode_info *ei = foo;
99
100 inode_init_once(&ei->vfs_inode);
101}
102
103static int init_inodecache(void)
104{
105 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
106 sizeof(struct iso_inode_info),
107 0, (SLAB_RECLAIM_ACCOUNT|
108 SLAB_MEM_SPREAD),
109 init_once);
110 if (isofs_inode_cachep == NULL)
111 return -ENOMEM;
112 return 0;
113}
114
115static void destroy_inodecache(void)
116{
117 kmem_cache_destroy(isofs_inode_cachep);
118}
119
120static int isofs_remount(struct super_block *sb, int *flags, char *data)
121{
122 /* we probably want a lot more here */
123 *flags |= MS_RDONLY;
124 return 0;
125}
126
127static const struct super_operations isofs_sops = {
128 .alloc_inode = isofs_alloc_inode,
129 .destroy_inode = isofs_destroy_inode,
130 .put_super = isofs_put_super,
131 .statfs = isofs_statfs,
132 .remount_fs = isofs_remount,
133 .show_options = generic_show_options,
134};
135
136
137static const struct dentry_operations isofs_dentry_ops[] = {
138 {
139 .d_hash = isofs_hash,
140 .d_compare = isofs_dentry_cmp,
141 },
142 {
143 .d_hash = isofs_hashi,
144 .d_compare = isofs_dentry_cmpi,
145 },
146#ifdef CONFIG_JOLIET
147 {
148 .d_hash = isofs_hash_ms,
149 .d_compare = isofs_dentry_cmp_ms,
150 },
151 {
152 .d_hash = isofs_hashi_ms,
153 .d_compare = isofs_dentry_cmpi_ms,
154 },
155#endif
156};
157
158struct iso9660_options{
159 unsigned int rock:1;
160 unsigned int joliet:1;
161 unsigned int cruft:1;
162 unsigned int hide:1;
163 unsigned int showassoc:1;
164 unsigned int nocompress:1;
165 unsigned int overriderockperm:1;
166 unsigned int uid_set:1;
167 unsigned int gid_set:1;
168 unsigned int utf8:1;
169 unsigned char map;
170 unsigned char check;
171 unsigned int blocksize;
172 umode_t fmode;
173 umode_t dmode;
174 gid_t gid;
175 uid_t uid;
176 char *iocharset;
177 /* LVE */
178 s32 session;
179 s32 sbsector;
180};
181
182/*
183 * Compute the hash for the isofs name corresponding to the dentry.
184 */
185static int
186isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
187{
188 const char *name;
189 int len;
190
191 len = qstr->len;
192 name = qstr->name;
193 if (ms) {
194 while (len && name[len-1] == '.')
195 len--;
196 }
197
198 qstr->hash = full_name_hash(name, len);
199
200 return 0;
201}
202
203/*
204 * Compute the hash for the isofs name corresponding to the dentry.
205 */
206static int
207isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
208{
209 const char *name;
210 int len;
211 char c;
212 unsigned long hash;
213
214 len = qstr->len;
215 name = qstr->name;
216 if (ms) {
217 while (len && name[len-1] == '.')
218 len--;
219 }
220
221 hash = init_name_hash();
222 while (len--) {
223 c = tolower(*name++);
224 hash = partial_name_hash(c, hash);
225 }
226 qstr->hash = end_name_hash(hash);
227
228 return 0;
229}
230
231/*
232 * Compare of two isofs names.
233 */
234static int isofs_dentry_cmp_common(
235 unsigned int len, const char *str,
236 const struct qstr *name, int ms, int ci)
237{
238 int alen, blen;
239
240 /* A filename cannot end in '.' or we treat it like it has none */
241 alen = name->len;
242 blen = len;
243 if (ms) {
244 while (alen && name->name[alen-1] == '.')
245 alen--;
246 while (blen && str[blen-1] == '.')
247 blen--;
248 }
249 if (alen == blen) {
250 if (ci) {
251 if (strnicmp(name->name, str, alen) == 0)
252 return 0;
253 } else {
254 if (strncmp(name->name, str, alen) == 0)
255 return 0;
256 }
257 }
258 return 1;
259}
260
261static int
262isofs_hash(const struct dentry *dentry, const struct inode *inode,
263 struct qstr *qstr)
264{
265 return isofs_hash_common(dentry, qstr, 0);
266}
267
268static int
269isofs_hashi(const struct dentry *dentry, const struct inode *inode,
270 struct qstr *qstr)
271{
272 return isofs_hashi_common(dentry, qstr, 0);
273}
274
275static int
276isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
277 const struct dentry *dentry, const struct inode *inode,
278 unsigned int len, const char *str, const struct qstr *name)
279{
280 return isofs_dentry_cmp_common(len, str, name, 0, 0);
281}
282
283static int
284isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
285 const struct dentry *dentry, const struct inode *inode,
286 unsigned int len, const char *str, const struct qstr *name)
287{
288 return isofs_dentry_cmp_common(len, str, name, 0, 1);
289}
290
291#ifdef CONFIG_JOLIET
292static int
293isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
294 struct qstr *qstr)
295{
296 return isofs_hash_common(dentry, qstr, 1);
297}
298
299static int
300isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
301 struct qstr *qstr)
302{
303 return isofs_hashi_common(dentry, qstr, 1);
304}
305
306static int
307isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
308 const struct dentry *dentry, const struct inode *inode,
309 unsigned int len, const char *str, const struct qstr *name)
310{
311 return isofs_dentry_cmp_common(len, str, name, 1, 0);
312}
313
314static int
315isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
316 const struct dentry *dentry, const struct inode *inode,
317 unsigned int len, const char *str, const struct qstr *name)
318{
319 return isofs_dentry_cmp_common(len, str, name, 1, 1);
320}
321#endif
322
323enum {
324 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
325 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
326 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
327 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
328};
329
330static const match_table_t tokens = {
331 {Opt_norock, "norock"},
332 {Opt_nojoliet, "nojoliet"},
333 {Opt_unhide, "unhide"},
334 {Opt_hide, "hide"},
335 {Opt_showassoc, "showassoc"},
336 {Opt_cruft, "cruft"},
337 {Opt_utf8, "utf8"},
338 {Opt_iocharset, "iocharset=%s"},
339 {Opt_map_a, "map=acorn"},
340 {Opt_map_a, "map=a"},
341 {Opt_map_n, "map=normal"},
342 {Opt_map_n, "map=n"},
343 {Opt_map_o, "map=off"},
344 {Opt_map_o, "map=o"},
345 {Opt_session, "session=%u"},
346 {Opt_sb, "sbsector=%u"},
347 {Opt_check_r, "check=relaxed"},
348 {Opt_check_r, "check=r"},
349 {Opt_check_s, "check=strict"},
350 {Opt_check_s, "check=s"},
351 {Opt_uid, "uid=%u"},
352 {Opt_gid, "gid=%u"},
353 {Opt_mode, "mode=%u"},
354 {Opt_dmode, "dmode=%u"},
355 {Opt_overriderockperm, "overriderockperm"},
356 {Opt_block, "block=%u"},
357 {Opt_ignore, "conv=binary"},
358 {Opt_ignore, "conv=b"},
359 {Opt_ignore, "conv=text"},
360 {Opt_ignore, "conv=t"},
361 {Opt_ignore, "conv=mtext"},
362 {Opt_ignore, "conv=m"},
363 {Opt_ignore, "conv=auto"},
364 {Opt_ignore, "conv=a"},
365 {Opt_nocompress, "nocompress"},
366 {Opt_err, NULL}
367};
368
369static int parse_options(char *options, struct iso9660_options *popt)
370{
371 char *p;
372 int option;
373
374 popt->map = 'n';
375 popt->rock = 1;
376 popt->joliet = 1;
377 popt->cruft = 0;
378 popt->hide = 0;
379 popt->showassoc = 0;
380 popt->check = 'u'; /* unset */
381 popt->nocompress = 0;
382 popt->blocksize = 1024;
383 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
384 popt->uid_set = 0;
385 popt->gid_set = 0;
386 popt->gid = 0;
387 popt->uid = 0;
388 popt->iocharset = NULL;
389 popt->utf8 = 0;
390 popt->overriderockperm = 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 = 0;
408 break;
409 case Opt_nojoliet:
410 popt->joliet = 0;
411 break;
412 case Opt_hide:
413 popt->hide = 1;
414 break;
415 case Opt_unhide:
416 case Opt_showassoc:
417 popt->showassoc = 1;
418 break;
419 case Opt_cruft:
420 popt->cruft = 1;
421 break;
422 case Opt_utf8:
423 popt->utf8 = 1;
424 break;
425#ifdef CONFIG_JOLIET
426 case Opt_iocharset:
427 popt->iocharset = match_strdup(&args[0]);
428 break;
429#endif
430 case Opt_map_a:
431 popt->map = 'a';
432 break;
433 case Opt_map_o:
434 popt->map = 'o';
435 break;
436 case Opt_map_n:
437 popt->map = 'n';
438 break;
439 case Opt_session:
440 if (match_int(&args[0], &option))
441 return 0;
442 n = option;
443 if (n > 99)
444 return 0;
445 popt->session = n + 1;
446 break;
447 case Opt_sb:
448 if (match_int(&args[0], &option))
449 return 0;
450 popt->sbsector = option;
451 break;
452 case Opt_check_r:
453 popt->check = 'r';
454 break;
455 case Opt_check_s:
456 popt->check = 's';
457 break;
458 case Opt_ignore:
459 break;
460 case Opt_uid:
461 if (match_int(&args[0], &option))
462 return 0;
463 popt->uid = option;
464 popt->uid_set = 1;
465 break;
466 case Opt_gid:
467 if (match_int(&args[0], &option))
468 return 0;
469 popt->gid = option;
470 popt->gid_set = 1;
471 break;
472 case Opt_mode:
473 if (match_int(&args[0], &option))
474 return 0;
475 popt->fmode = option;
476 break;
477 case Opt_dmode:
478 if (match_int(&args[0], &option))
479 return 0;
480 popt->dmode = option;
481 break;
482 case Opt_overriderockperm:
483 popt->overriderockperm = 1;
484 break;
485 case Opt_block:
486 if (match_int(&args[0], &option))
487 return 0;
488 n = option;
489 if (n != 512 && n != 1024 && n != 2048)
490 return 0;
491 popt->blocksize = n;
492 break;
493 case Opt_nocompress:
494 popt->nocompress = 1;
495 break;
496 default:
497 return 0;
498 }
499 }
500 return 1;
501}
502
503/*
504 * look if the driver can tell the multi session redirection value
505 *
506 * don't change this if you don't know what you do, please!
507 * Multisession is legal only with XA disks.
508 * A non-XA disk with more than one volume descriptor may do it right, but
509 * usually is written in a nowhere standardized "multi-partition" manner.
510 * Multisession uses absolute addressing (solely the first frame of the whole
511 * track is #0), multi-partition uses relative addressing (each first frame of
512 * each track is #0), and a track is not a session.
513 *
514 * A broken CDwriter software or drive firmware does not set new standards,
515 * at least not if conflicting with the existing ones.
516 *
517 * emoenke@gwdg.de
518 */
519#define WE_OBEY_THE_WRITTEN_STANDARDS 1
520
521static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
522{
523 struct cdrom_multisession ms_info;
524 unsigned int vol_desc_start;
525 struct block_device *bdev = sb->s_bdev;
526 int i;
527
528 vol_desc_start=0;
529 ms_info.addr_format=CDROM_LBA;
530 if(session >= 0 && session <= 99) {
531 struct cdrom_tocentry Te;
532 Te.cdte_track=session;
533 Te.cdte_format=CDROM_LBA;
534 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
535 if (!i) {
536 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
537 session, Te.cdte_addr.lba,
538 Te.cdte_ctrl&CDROM_DATA_TRACK);
539 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
540 return Te.cdte_addr.lba;
541 }
542
543 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
544 }
545 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
546 if (session > 0)
547 printk(KERN_ERR "ISOFS: Invalid session number\n");
548#if 0
549 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
550 if (i==0) {
551 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
552 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
553 }
554#endif
555 if (i==0)
556#if WE_OBEY_THE_WRITTEN_STANDARDS
557 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
558#endif
559 vol_desc_start=ms_info.addr.lba;
560 return vol_desc_start;
561}
562
563/*
564 * Check if root directory is empty (has less than 3 files).
565 *
566 * Used to detect broken CDs where ISO root directory is empty but Joliet root
567 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
568 * (and Joliet used instead) or else no files would be visible.
569 */
570static bool rootdir_empty(struct super_block *sb, unsigned long block)
571{
572 int offset = 0, files = 0, de_len;
573 struct iso_directory_record *de;
574 struct buffer_head *bh;
575
576 bh = sb_bread(sb, block);
577 if (!bh)
578 return true;
579 while (files < 3) {
580 de = (struct iso_directory_record *) (bh->b_data + offset);
581 de_len = *(unsigned char *) de;
582 if (de_len == 0)
583 break;
584 files++;
585 offset += de_len;
586 }
587 brelse(bh);
588 return files < 3;
589}
590
591/*
592 * Initialize the superblock and read the root inode.
593 *
594 * Note: a check_disk_change() has been done immediately prior
595 * to this call, so we don't need to check again.
596 */
597static int isofs_fill_super(struct super_block *s, void *data, int silent)
598{
599 struct buffer_head *bh = NULL, *pri_bh = NULL;
600 struct hs_primary_descriptor *h_pri = NULL;
601 struct iso_primary_descriptor *pri = NULL;
602 struct iso_supplementary_descriptor *sec = NULL;
603 struct iso_directory_record *rootp;
604 struct inode *inode;
605 struct iso9660_options opt;
606 struct isofs_sb_info *sbi;
607 unsigned long first_data_zone;
608 int joliet_level = 0;
609 int iso_blknum, block;
610 int orig_zonesize;
611 int table, error = -EINVAL;
612 unsigned int vol_desc_start;
613
614 save_mount_options(s, data);
615
616 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617 if (!sbi)
618 return -ENOMEM;
619 s->s_fs_info = sbi;
620
621 if (!parse_options((char *)data, &opt))
622 goto out_freesbi;
623
624 /*
625 * First of all, get the hardware blocksize for this device.
626 * If we don't know what it is, or the hardware blocksize is
627 * larger than the blocksize the user specified, then use
628 * that value.
629 */
630 /*
631 * What if bugger tells us to go beyond page size?
632 */
633 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
634
635 sbi->s_high_sierra = 0; /* default is iso9660 */
636
637 vol_desc_start = (opt.sbsector != -1) ?
638 opt.sbsector : isofs_get_last_session(s,opt.session);
639
640 for (iso_blknum = vol_desc_start+16;
641 iso_blknum < vol_desc_start+100; iso_blknum++) {
642 struct hs_volume_descriptor *hdp;
643 struct iso_volume_descriptor *vdp;
644
645 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
646 if (!(bh = sb_bread(s, block)))
647 goto out_no_read;
648
649 vdp = (struct iso_volume_descriptor *)bh->b_data;
650 hdp = (struct hs_volume_descriptor *)bh->b_data;
651
652 /*
653 * Due to the overlapping physical location of the descriptors,
654 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
655 * proper identification in this case, we first check for ISO.
656 */
657 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
658 if (isonum_711(vdp->type) == ISO_VD_END)
659 break;
660 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
661 if (pri == NULL) {
662 pri = (struct iso_primary_descriptor *)vdp;
663 /* Save the buffer in case we need it ... */
664 pri_bh = bh;
665 bh = NULL;
666 }
667 }
668#ifdef CONFIG_JOLIET
669 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
670 sec = (struct iso_supplementary_descriptor *)vdp;
671 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
672 if (opt.joliet) {
673 if (sec->escape[2] == 0x40)
674 joliet_level = 1;
675 else if (sec->escape[2] == 0x43)
676 joliet_level = 2;
677 else if (sec->escape[2] == 0x45)
678 joliet_level = 3;
679
680 printk(KERN_DEBUG "ISO 9660 Extensions: "
681 "Microsoft Joliet Level %d\n",
682 joliet_level);
683 }
684 goto root_found;
685 } else {
686 /* Unknown supplementary volume descriptor */
687 sec = NULL;
688 }
689 }
690#endif
691 } else {
692 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
693 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
694 goto out_freebh;
695
696 sbi->s_high_sierra = 1;
697 opt.rock = 0;
698 h_pri = (struct hs_primary_descriptor *)vdp;
699 goto root_found;
700 }
701 }
702
703 /* Just skip any volume descriptors we don't recognize */
704
705 brelse(bh);
706 bh = NULL;
707 }
708 /*
709 * If we fall through, either no volume descriptor was found,
710 * or else we passed a primary descriptor looking for others.
711 */
712 if (!pri)
713 goto out_unknown_format;
714 brelse(bh);
715 bh = pri_bh;
716 pri_bh = NULL;
717
718root_found:
719
720 if (joliet_level && (pri == NULL || !opt.rock)) {
721 /* This is the case of Joliet with the norock mount flag.
722 * A disc with both Joliet and Rock Ridge is handled later
723 */
724 pri = (struct iso_primary_descriptor *) sec;
725 }
726
727 if(sbi->s_high_sierra){
728 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
729 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
730 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
731 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
732 } else {
733 if (!pri)
734 goto out_freebh;
735 rootp = (struct iso_directory_record *) pri->root_directory_record;
736 sbi->s_nzones = isonum_733(pri->volume_space_size);
737 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
738 sbi->s_max_size = isonum_733(pri->volume_space_size);
739 }
740
741 sbi->s_ninodes = 0; /* No way to figure this out easily */
742
743 orig_zonesize = sbi->s_log_zone_size;
744 /*
745 * If the zone size is smaller than the hardware sector size,
746 * this is a fatal error. This would occur if the disc drive
747 * had sectors that were 2048 bytes, but the filesystem had
748 * blocks that were 512 bytes (which should only very rarely
749 * happen.)
750 */
751 if (orig_zonesize < opt.blocksize)
752 goto out_bad_size;
753
754 /* RDE: convert log zone size to bit shift */
755 switch (sbi->s_log_zone_size) {
756 case 512: sbi->s_log_zone_size = 9; break;
757 case 1024: sbi->s_log_zone_size = 10; break;
758 case 2048: sbi->s_log_zone_size = 11; break;
759
760 default:
761 goto out_bad_zone_size;
762 }
763
764 s->s_magic = ISOFS_SUPER_MAGIC;
765
766 /*
767 * With multi-extent files, file size is only limited by the maximum
768 * size of a file system, which is 8 TB.
769 */
770 s->s_maxbytes = 0x80000000000LL;
771
772 /*
773 * The CDROM is read-only, has no nodes (devices) on it, and since
774 * all of the files appear to be owned by root, we really do not want
775 * to allow suid. (suid or devices will not show up unless we have
776 * Rock Ridge extensions)
777 */
778
779 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
780
781 /* Set this for reference. Its not currently used except on write
782 which we don't have .. */
783
784 first_data_zone = isonum_733(rootp->extent) +
785 isonum_711(rootp->ext_attr_length);
786 sbi->s_firstdatazone = first_data_zone;
787#ifndef BEQUIET
788 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
789 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
790 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
791 if(sbi->s_high_sierra)
792 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
793#endif
794
795 /*
796 * If the Joliet level is set, we _may_ decide to use the
797 * secondary descriptor, but can't be sure until after we
798 * read the root inode. But before reading the root inode
799 * we may need to change the device blocksize, and would
800 * rather release the old buffer first. So, we cache the
801 * first_data_zone value from the secondary descriptor.
802 */
803 if (joliet_level) {
804 pri = (struct iso_primary_descriptor *) sec;
805 rootp = (struct iso_directory_record *)
806 pri->root_directory_record;
807 first_data_zone = isonum_733(rootp->extent) +
808 isonum_711(rootp->ext_attr_length);
809 }
810
811 /*
812 * We're all done using the volume descriptor, and may need
813 * to change the device blocksize, so release the buffer now.
814 */
815 brelse(pri_bh);
816 brelse(bh);
817
818 /*
819 * Force the blocksize to 512 for 512 byte sectors. The file
820 * read primitives really get it wrong in a bad way if we don't
821 * do this.
822 *
823 * Note - we should never be setting the blocksize to something
824 * less than the hardware sector size for the device. If we
825 * do, we would end up having to read larger buffers and split
826 * out portions to satisfy requests.
827 *
828 * Note2- the idea here is that we want to deal with the optimal
829 * zonesize in the filesystem. If we have it set to something less,
830 * then we have horrible problems with trying to piece together
831 * bits of adjacent blocks in order to properly read directory
832 * entries. By forcing the blocksize in this way, we ensure
833 * that we will never be required to do this.
834 */
835 sb_set_blocksize(s, orig_zonesize);
836
837 sbi->s_nls_iocharset = NULL;
838
839#ifdef CONFIG_JOLIET
840 if (joliet_level && opt.utf8 == 0) {
841 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
842 sbi->s_nls_iocharset = load_nls(p);
843 if (! sbi->s_nls_iocharset) {
844 /* Fail only if explicit charset specified */
845 if (opt.iocharset)
846 goto out_freesbi;
847 sbi->s_nls_iocharset = load_nls_default();
848 }
849 }
850#endif
851 s->s_op = &isofs_sops;
852 s->s_export_op = &isofs_export_ops;
853 sbi->s_mapping = opt.map;
854 sbi->s_rock = (opt.rock ? 2 : 0);
855 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
856 sbi->s_cruft = opt.cruft;
857 sbi->s_hide = opt.hide;
858 sbi->s_showassoc = opt.showassoc;
859 sbi->s_uid = opt.uid;
860 sbi->s_gid = opt.gid;
861 sbi->s_uid_set = opt.uid_set;
862 sbi->s_gid_set = opt.gid_set;
863 sbi->s_utf8 = opt.utf8;
864 sbi->s_nocompress = opt.nocompress;
865 sbi->s_overriderockperm = opt.overriderockperm;
866 /*
867 * It would be incredibly stupid to allow people to mark every file
868 * on the disk as suid, so we merely allow them to set the default
869 * permissions.
870 */
871 if (opt.fmode != ISOFS_INVALID_MODE)
872 sbi->s_fmode = opt.fmode & 0777;
873 else
874 sbi->s_fmode = ISOFS_INVALID_MODE;
875 if (opt.dmode != ISOFS_INVALID_MODE)
876 sbi->s_dmode = opt.dmode & 0777;
877 else
878 sbi->s_dmode = ISOFS_INVALID_MODE;
879
880 /*
881 * Read the root inode, which _may_ result in changing
882 * the s_rock flag. Once we have the final s_rock value,
883 * we then decide whether to use the Joliet descriptor.
884 */
885 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
886 if (IS_ERR(inode))
887 goto out_no_root;
888
889 /*
890 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
891 * correct Joliet root directory.
892 */
893 if (sbi->s_rock == 1 && joliet_level &&
894 rootdir_empty(s, sbi->s_firstdatazone)) {
895 printk(KERN_NOTICE
896 "ISOFS: primary root directory is empty. "
897 "Disabling Rock Ridge and switching to Joliet.");
898 sbi->s_rock = 0;
899 }
900
901 /*
902 * If this disk has both Rock Ridge and Joliet on it, then we
903 * want to use Rock Ridge by default. This can be overridden
904 * by using the norock mount option. There is still one other
905 * possibility that is not taken into account: a Rock Ridge
906 * CD with Unicode names. Until someone sees such a beast, it
907 * will not be supported.
908 */
909 if (sbi->s_rock == 1) {
910 joliet_level = 0;
911 } else if (joliet_level) {
912 sbi->s_rock = 0;
913 if (sbi->s_firstdatazone != first_data_zone) {
914 sbi->s_firstdatazone = first_data_zone;
915 printk(KERN_DEBUG
916 "ISOFS: changing to secondary root\n");
917 iput(inode);
918 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
919 if (IS_ERR(inode))
920 goto out_no_root;
921 }
922 }
923
924 if (opt.check == 'u') {
925 /* Only Joliet is case insensitive by default */
926 if (joliet_level)
927 opt.check = 'r';
928 else
929 opt.check = 's';
930 }
931 sbi->s_joliet_level = joliet_level;
932
933 /* Make sure the root inode is a directory */
934 if (!S_ISDIR(inode->i_mode)) {
935 printk(KERN_WARNING
936 "isofs_fill_super: root inode is not a directory. "
937 "Corrupted media?\n");
938 goto out_iput;
939 }
940
941 table = 0;
942 if (joliet_level)
943 table += 2;
944 if (opt.check == 'r')
945 table++;
946
947 s->s_d_op = &isofs_dentry_ops[table];
948
949 /* get the root dentry */
950 s->s_root = d_make_root(inode);
951 if (!(s->s_root)) {
952 error = -ENOMEM;
953 goto out_no_inode;
954 }
955
956 kfree(opt.iocharset);
957
958 return 0;
959
960 /*
961 * Display error messages and free resources.
962 */
963out_iput:
964 iput(inode);
965 goto out_no_inode;
966out_no_root:
967 error = PTR_ERR(inode);
968 if (error != -ENOMEM)
969 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
970out_no_inode:
971#ifdef CONFIG_JOLIET
972 unload_nls(sbi->s_nls_iocharset);
973#endif
974 goto out_freesbi;
975out_no_read:
976 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
977 __func__, s->s_id, iso_blknum, block);
978 goto out_freebh;
979out_bad_zone_size:
980 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
981 sbi->s_log_zone_size);
982 goto out_freebh;
983out_bad_size:
984 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
985 orig_zonesize, opt.blocksize);
986 goto out_freebh;
987out_unknown_format:
988 if (!silent)
989 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
990
991out_freebh:
992 brelse(bh);
993 brelse(pri_bh);
994out_freesbi:
995 kfree(opt.iocharset);
996 kfree(sbi);
997 s->s_fs_info = NULL;
998 return error;
999}
1000
1001static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1002{
1003 struct super_block *sb = dentry->d_sb;
1004 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1005
1006 buf->f_type = ISOFS_SUPER_MAGIC;
1007 buf->f_bsize = sb->s_blocksize;
1008 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1009 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1010 buf->f_bfree = 0;
1011 buf->f_bavail = 0;
1012 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1013 buf->f_ffree = 0;
1014 buf->f_fsid.val[0] = (u32)id;
1015 buf->f_fsid.val[1] = (u32)(id >> 32);
1016 buf->f_namelen = NAME_MAX;
1017 return 0;
1018}
1019
1020/*
1021 * Get a set of blocks; filling in buffer_heads if already allocated
1022 * or getblk() if they are not. Returns the number of blocks inserted
1023 * (-ve == error.)
1024 */
1025int isofs_get_blocks(struct inode *inode, sector_t iblock,
1026 struct buffer_head **bh, unsigned long nblocks)
1027{
1028 unsigned long b_off = iblock;
1029 unsigned offset, sect_size;
1030 unsigned int firstext;
1031 unsigned long nextblk, nextoff;
1032 int section, rv, error;
1033 struct iso_inode_info *ei = ISOFS_I(inode);
1034
1035 error = -EIO;
1036 rv = 0;
1037 if (iblock != b_off) {
1038 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1039 goto abort;
1040 }
1041
1042
1043 offset = 0;
1044 firstext = ei->i_first_extent;
1045 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1046 nextblk = ei->i_next_section_block;
1047 nextoff = ei->i_next_section_offset;
1048 section = 0;
1049
1050 while (nblocks) {
1051 /* If we are *way* beyond the end of the file, print a message.
1052 * Access beyond the end of the file up to the next page boundary
1053 * is normal, however because of the way the page cache works.
1054 * In this case, we just return 0 so that we can properly fill
1055 * the page with useless information without generating any
1056 * I/O errors.
1057 */
1058 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1059 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1060 __func__, b_off,
1061 (unsigned long long)inode->i_size);
1062 goto abort;
1063 }
1064
1065 /* On the last section, nextblk == 0, section size is likely to
1066 * exceed sect_size by a partial block, and access beyond the
1067 * end of the file will reach beyond the section size, too.
1068 */
1069 while (nextblk && (b_off >= (offset + sect_size))) {
1070 struct inode *ninode;
1071
1072 offset += sect_size;
1073 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1074 if (IS_ERR(ninode)) {
1075 error = PTR_ERR(ninode);
1076 goto abort;
1077 }
1078 firstext = ISOFS_I(ninode)->i_first_extent;
1079 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1080 nextblk = ISOFS_I(ninode)->i_next_section_block;
1081 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1082 iput(ninode);
1083
1084 if (++section > 100) {
1085 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1086 " aborting...\n", __func__);
1087 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1088 "nextblk=%lu nextoff=%lu\n", __func__,
1089 b_off, firstext, (unsigned) sect_size,
1090 nextblk, nextoff);
1091 goto abort;
1092 }
1093 }
1094
1095 if (*bh) {
1096 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1097 } else {
1098 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1099 if (!*bh)
1100 goto abort;
1101 }
1102 bh++; /* Next buffer head */
1103 b_off++; /* Next buffer offset */
1104 nblocks--;
1105 rv++;
1106 }
1107
1108 error = 0;
1109abort:
1110 return rv != 0 ? rv : error;
1111}
1112
1113/*
1114 * Used by the standard interfaces.
1115 */
1116static int isofs_get_block(struct inode *inode, sector_t iblock,
1117 struct buffer_head *bh_result, int create)
1118{
1119 int ret;
1120
1121 if (create) {
1122 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1123 return -EROFS;
1124 }
1125
1126 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1127 return ret < 0 ? ret : 0;
1128}
1129
1130static int isofs_bmap(struct inode *inode, sector_t block)
1131{
1132 struct buffer_head dummy;
1133 int error;
1134
1135 dummy.b_state = 0;
1136 dummy.b_blocknr = -1000;
1137 error = isofs_get_block(inode, block, &dummy, 0);
1138 if (!error)
1139 return dummy.b_blocknr;
1140 return 0;
1141}
1142
1143struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1144{
1145 sector_t blknr = isofs_bmap(inode, block);
1146 if (!blknr)
1147 return NULL;
1148 return sb_bread(inode->i_sb, blknr);
1149}
1150
1151static int isofs_readpage(struct file *file, struct page *page)
1152{
1153 return mpage_readpage(page, isofs_get_block);
1154}
1155
1156static int isofs_readpages(struct file *file, struct address_space *mapping,
1157 struct list_head *pages, unsigned nr_pages)
1158{
1159 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1160}
1161
1162static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1163{
1164 return generic_block_bmap(mapping,block,isofs_get_block);
1165}
1166
1167static const struct address_space_operations isofs_aops = {
1168 .readpage = isofs_readpage,
1169 .readpages = isofs_readpages,
1170 .bmap = _isofs_bmap
1171};
1172
1173static int isofs_read_level3_size(struct inode *inode)
1174{
1175 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1176 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1177 struct buffer_head *bh = NULL;
1178 unsigned long block, offset, block_saved, offset_saved;
1179 int i = 0;
1180 int more_entries = 0;
1181 struct iso_directory_record *tmpde = NULL;
1182 struct iso_inode_info *ei = ISOFS_I(inode);
1183
1184 inode->i_size = 0;
1185
1186 /* The first 16 blocks are reserved as the System Area. Thus,
1187 * no inodes can appear in block 0. We use this to flag that
1188 * this is the last section. */
1189 ei->i_next_section_block = 0;
1190 ei->i_next_section_offset = 0;
1191
1192 block = ei->i_iget5_block;
1193 offset = ei->i_iget5_offset;
1194
1195 do {
1196 struct iso_directory_record *de;
1197 unsigned int de_len;
1198
1199 if (!bh) {
1200 bh = sb_bread(inode->i_sb, block);
1201 if (!bh)
1202 goto out_noread;
1203 }
1204 de = (struct iso_directory_record *) (bh->b_data + offset);
1205 de_len = *(unsigned char *) de;
1206
1207 if (de_len == 0) {
1208 brelse(bh);
1209 bh = NULL;
1210 ++block;
1211 offset = 0;
1212 continue;
1213 }
1214
1215 block_saved = block;
1216 offset_saved = offset;
1217 offset += de_len;
1218
1219 /* Make sure we have a full directory entry */
1220 if (offset >= bufsize) {
1221 int slop = bufsize - offset + de_len;
1222 if (!tmpde) {
1223 tmpde = kmalloc(256, GFP_KERNEL);
1224 if (!tmpde)
1225 goto out_nomem;
1226 }
1227 memcpy(tmpde, de, slop);
1228 offset &= bufsize - 1;
1229 block++;
1230 brelse(bh);
1231 bh = NULL;
1232 if (offset) {
1233 bh = sb_bread(inode->i_sb, block);
1234 if (!bh)
1235 goto out_noread;
1236 memcpy((void *)tmpde+slop, bh->b_data, offset);
1237 }
1238 de = tmpde;
1239 }
1240
1241 inode->i_size += isonum_733(de->size);
1242 if (i == 1) {
1243 ei->i_next_section_block = block_saved;
1244 ei->i_next_section_offset = offset_saved;
1245 }
1246
1247 more_entries = de->flags[-high_sierra] & 0x80;
1248
1249 i++;
1250 if (i > 100)
1251 goto out_toomany;
1252 } while (more_entries);
1253out:
1254 kfree(tmpde);
1255 if (bh)
1256 brelse(bh);
1257 return 0;
1258
1259out_nomem:
1260 if (bh)
1261 brelse(bh);
1262 return -ENOMEM;
1263
1264out_noread:
1265 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1266 kfree(tmpde);
1267 return -EIO;
1268
1269out_toomany:
1270 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1271 "isofs_read_level3_size: inode=%lu\n",
1272 __func__, inode->i_ino);
1273 goto out;
1274}
1275
1276static int isofs_read_inode(struct inode *inode)
1277{
1278 struct super_block *sb = inode->i_sb;
1279 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1280 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1281 unsigned long block;
1282 int high_sierra = sbi->s_high_sierra;
1283 struct buffer_head *bh = NULL;
1284 struct iso_directory_record *de;
1285 struct iso_directory_record *tmpde = NULL;
1286 unsigned int de_len;
1287 unsigned long offset;
1288 struct iso_inode_info *ei = ISOFS_I(inode);
1289 int ret = -EIO;
1290
1291 block = ei->i_iget5_block;
1292 bh = sb_bread(inode->i_sb, block);
1293 if (!bh)
1294 goto out_badread;
1295
1296 offset = ei->i_iget5_offset;
1297
1298 de = (struct iso_directory_record *) (bh->b_data + offset);
1299 de_len = *(unsigned char *) de;
1300
1301 if (offset + de_len > bufsize) {
1302 int frag1 = bufsize - offset;
1303
1304 tmpde = kmalloc(de_len, GFP_KERNEL);
1305 if (tmpde == NULL) {
1306 printk(KERN_INFO "%s: out of memory\n", __func__);
1307 ret = -ENOMEM;
1308 goto fail;
1309 }
1310 memcpy(tmpde, bh->b_data + offset, frag1);
1311 brelse(bh);
1312 bh = sb_bread(inode->i_sb, ++block);
1313 if (!bh)
1314 goto out_badread;
1315 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1316 de = tmpde;
1317 }
1318
1319 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1320 ei->i_iget5_offset,
1321 ISOFS_BUFFER_BITS(inode));
1322
1323 /* Assume it is a normal-format file unless told otherwise */
1324 ei->i_file_format = isofs_file_normal;
1325
1326 if (de->flags[-high_sierra] & 2) {
1327 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1328 inode->i_mode = S_IFDIR | sbi->s_dmode;
1329 else
1330 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1331 set_nlink(inode, 1); /*
1332 * Set to 1. We know there are 2, but
1333 * the find utility tries to optimize
1334 * if it is 2, and it screws up. It is
1335 * easier to give 1 which tells find to
1336 * do it the hard way.
1337 */
1338 } else {
1339 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1340 inode->i_mode = S_IFREG | sbi->s_fmode;
1341 } else {
1342 /*
1343 * Set default permissions: r-x for all. The disc
1344 * could be shared with DOS machines so virtually
1345 * anything could be a valid executable.
1346 */
1347 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1348 }
1349 set_nlink(inode, 1);
1350 }
1351 inode->i_uid = sbi->s_uid;
1352 inode->i_gid = sbi->s_gid;
1353 inode->i_blocks = 0;
1354
1355 ei->i_format_parm[0] = 0;
1356 ei->i_format_parm[1] = 0;
1357 ei->i_format_parm[2] = 0;
1358
1359 ei->i_section_size = isonum_733(de->size);
1360 if (de->flags[-high_sierra] & 0x80) {
1361 ret = isofs_read_level3_size(inode);
1362 if (ret < 0)
1363 goto fail;
1364 ret = -EIO;
1365 } else {
1366 ei->i_next_section_block = 0;
1367 ei->i_next_section_offset = 0;
1368 inode->i_size = isonum_733(de->size);
1369 }
1370
1371 /*
1372 * Some dipshit decided to store some other bit of information
1373 * in the high byte of the file length. Truncate size in case
1374 * this CDROM was mounted with the cruft option.
1375 */
1376
1377 if (sbi->s_cruft)
1378 inode->i_size &= 0x00ffffff;
1379
1380 if (de->interleave[0]) {
1381 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1382 inode->i_size = 0;
1383 }
1384
1385 /* I have no idea what file_unit_size is used for, so
1386 we will flag it for now */
1387 if (de->file_unit_size[0] != 0) {
1388 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1389 inode->i_ino);
1390 }
1391
1392 /* I have no idea what other flag bits are used for, so
1393 we will flag it for now */
1394#ifdef DEBUG
1395 if((de->flags[-high_sierra] & ~2)!= 0){
1396 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1397 "(%ld %x).\n",
1398 inode->i_ino, de->flags[-high_sierra]);
1399 }
1400#endif
1401
1402 inode->i_mtime.tv_sec =
1403 inode->i_atime.tv_sec =
1404 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1405 inode->i_mtime.tv_nsec =
1406 inode->i_atime.tv_nsec =
1407 inode->i_ctime.tv_nsec = 0;
1408
1409 ei->i_first_extent = (isonum_733(de->extent) +
1410 isonum_711(de->ext_attr_length));
1411
1412 /* Set the number of blocks for stat() - should be done before RR */
1413 inode->i_blocks = (inode->i_size + 511) >> 9;
1414
1415 /*
1416 * Now test for possible Rock Ridge extensions which will override
1417 * some of these numbers in the inode structure.
1418 */
1419
1420 if (!high_sierra) {
1421 parse_rock_ridge_inode(de, inode);
1422 /* if we want uid/gid set, override the rock ridge setting */
1423 if (sbi->s_uid_set)
1424 inode->i_uid = sbi->s_uid;
1425 if (sbi->s_gid_set)
1426 inode->i_gid = sbi->s_gid;
1427 }
1428 /* Now set final access rights if overriding rock ridge setting */
1429 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1430 sbi->s_dmode != ISOFS_INVALID_MODE)
1431 inode->i_mode = S_IFDIR | sbi->s_dmode;
1432 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1433 sbi->s_fmode != ISOFS_INVALID_MODE)
1434 inode->i_mode = S_IFREG | sbi->s_fmode;
1435
1436 /* Install the inode operations vector */
1437 if (S_ISREG(inode->i_mode)) {
1438 inode->i_fop = &generic_ro_fops;
1439 switch (ei->i_file_format) {
1440#ifdef CONFIG_ZISOFS
1441 case isofs_file_compressed:
1442 inode->i_data.a_ops = &zisofs_aops;
1443 break;
1444#endif
1445 default:
1446 inode->i_data.a_ops = &isofs_aops;
1447 break;
1448 }
1449 } else if (S_ISDIR(inode->i_mode)) {
1450 inode->i_op = &isofs_dir_inode_operations;
1451 inode->i_fop = &isofs_dir_operations;
1452 } else if (S_ISLNK(inode->i_mode)) {
1453 inode->i_op = &page_symlink_inode_operations;
1454 inode->i_data.a_ops = &isofs_symlink_aops;
1455 } else
1456 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1457 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1458
1459 ret = 0;
1460out:
1461 kfree(tmpde);
1462 if (bh)
1463 brelse(bh);
1464 return ret;
1465
1466out_badread:
1467 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1468fail:
1469 goto out;
1470}
1471
1472struct isofs_iget5_callback_data {
1473 unsigned long block;
1474 unsigned long offset;
1475};
1476
1477static int isofs_iget5_test(struct inode *ino, void *data)
1478{
1479 struct iso_inode_info *i = ISOFS_I(ino);
1480 struct isofs_iget5_callback_data *d =
1481 (struct isofs_iget5_callback_data*)data;
1482 return (i->i_iget5_block == d->block)
1483 && (i->i_iget5_offset == d->offset);
1484}
1485
1486static int isofs_iget5_set(struct inode *ino, void *data)
1487{
1488 struct iso_inode_info *i = ISOFS_I(ino);
1489 struct isofs_iget5_callback_data *d =
1490 (struct isofs_iget5_callback_data*)data;
1491 i->i_iget5_block = d->block;
1492 i->i_iget5_offset = d->offset;
1493 return 0;
1494}
1495
1496/* Store, in the inode's containing structure, the block and block
1497 * offset that point to the underlying meta-data for the inode. The
1498 * code below is otherwise similar to the iget() code in
1499 * include/linux/fs.h */
1500struct inode *isofs_iget(struct super_block *sb,
1501 unsigned long block,
1502 unsigned long offset)
1503{
1504 unsigned long hashval;
1505 struct inode *inode;
1506 struct isofs_iget5_callback_data data;
1507 long ret;
1508
1509 if (offset >= 1ul << sb->s_blocksize_bits)
1510 return ERR_PTR(-EINVAL);
1511
1512 data.block = block;
1513 data.offset = offset;
1514
1515 hashval = (block << sb->s_blocksize_bits) | offset;
1516
1517 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1518 &isofs_iget5_set, &data);
1519
1520 if (!inode)
1521 return ERR_PTR(-ENOMEM);
1522
1523 if (inode->i_state & I_NEW) {
1524 ret = isofs_read_inode(inode);
1525 if (ret < 0) {
1526 iget_failed(inode);
1527 inode = ERR_PTR(ret);
1528 } else {
1529 unlock_new_inode(inode);
1530 }
1531 }
1532
1533 return inode;
1534}
1535
1536static struct dentry *isofs_mount(struct file_system_type *fs_type,
1537 int flags, const char *dev_name, void *data)
1538{
1539 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1540}
1541
1542static struct file_system_type iso9660_fs_type = {
1543 .owner = THIS_MODULE,
1544 .name = "iso9660",
1545 .mount = isofs_mount,
1546 .kill_sb = kill_block_super,
1547 .fs_flags = FS_REQUIRES_DEV,
1548};
1549
1550static int __init init_iso9660_fs(void)
1551{
1552 int err = init_inodecache();
1553 if (err)
1554 goto out;
1555#ifdef CONFIG_ZISOFS
1556 err = zisofs_init();
1557 if (err)
1558 goto out1;
1559#endif
1560 err = register_filesystem(&iso9660_fs_type);
1561 if (err)
1562 goto out2;
1563 return 0;
1564out2:
1565#ifdef CONFIG_ZISOFS
1566 zisofs_cleanup();
1567out1:
1568#endif
1569 destroy_inodecache();
1570out:
1571 return err;
1572}
1573
1574static void __exit exit_iso9660_fs(void)
1575{
1576 unregister_filesystem(&iso9660_fs_type);
1577#ifdef CONFIG_ZISOFS
1578 zisofs_cleanup();
1579#endif
1580 destroy_inodecache();
1581}
1582
1583module_init(init_iso9660_fs)
1584module_exit(exit_iso9660_fs)
1585MODULE_LICENSE("GPL");
1586/* Actual filesystem name is iso9660, as requested in filesystems.c */
1587MODULE_ALIAS("iso9660");
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
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 * Make sure all delayed rcu free inodes are flushed before we
107 * destroy cache.
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 /* LVE */
168 s32 session;
169 s32 sbsector;
170};
171
172/*
173 * Compute the hash for the isofs name corresponding to the dentry.
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 * Compare of two isofs names.
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 /* A filename cannot end in '.' or we treat it like it has none */
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 * Compute the hash for the isofs name corresponding to the dentry.
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'; /* unset */
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 * Track numbers are supposed to be in range 1-99, the
417 * mount option starts indexing at 0.
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 * Display the mount options in /proc/mounts.
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 * look if the driver can tell the multi session redirection value
529 *
530 * don't change this if you don't know what you do, please!
531 * Multisession is legal only with XA disks.
532 * A non-XA disk with more than one volume descriptor may do it right, but
533 * usually is written in a nowhere standardized "multi-partition" manner.
534 * Multisession uses absolute addressing (solely the first frame of the whole
535 * track is #0), multi-partition uses relative addressing (each first frame of
536 * each track is #0), and a track is not a session.
537 *
538 * A broken CDwriter software or drive firmware does not set new standards,
539 * at least not if conflicting with the existing ones.
540 *
541 * emoenke@gwdg.de
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 /* necessary for a valid ms_info.addr */
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 * Check if root directory is empty (has less than 3 files).
587 *
588 * Used to detect broken CDs where ISO root directory is empty but Joliet root
589 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
590 * (and Joliet used instead) or else no files would be visible.
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 * Initialize the superblock and read the root inode.
615 */
616static int isofs_fill_super(struct super_block *s, void *data, int silent)
617{
618 struct buffer_head *bh = NULL, *pri_bh = NULL;
619 struct hs_primary_descriptor *h_pri = NULL;
620 struct iso_primary_descriptor *pri = NULL;
621 struct iso_supplementary_descriptor *sec = NULL;
622 struct iso_directory_record *rootp;
623 struct inode *inode;
624 struct iso9660_options opt;
625 struct isofs_sb_info *sbi;
626 unsigned long first_data_zone;
627 int joliet_level = 0;
628 int iso_blknum, block;
629 int orig_zonesize;
630 int table, error = -EINVAL;
631 unsigned int vol_desc_start;
632
633 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
634 if (!sbi)
635 return -ENOMEM;
636 s->s_fs_info = sbi;
637
638 if (!parse_options((char *)data, &opt))
639 goto out_freesbi;
640
641 /*
642 * First of all, get the hardware blocksize for this device.
643 * If we don't know what it is, or the hardware blocksize is
644 * larger than the blocksize the user specified, then use
645 * that value.
646 */
647 /*
648 * What if bugger tells us to go beyond page size?
649 */
650 if (bdev_logical_block_size(s->s_bdev) > 2048) {
651 printk(KERN_WARNING
652 "ISOFS: unsupported/invalid hardware sector size %d\n",
653 bdev_logical_block_size(s->s_bdev));
654 goto out_freesbi;
655 }
656 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
657
658 sbi->s_high_sierra = 0; /* default is iso9660 */
659 sbi->s_session = opt.session;
660 sbi->s_sbsector = opt.sbsector;
661
662 vol_desc_start = (opt.sbsector != -1) ?
663 opt.sbsector : isofs_get_last_session(s,opt.session);
664
665 for (iso_blknum = vol_desc_start+16;
666 iso_blknum < vol_desc_start+100; iso_blknum++) {
667 struct hs_volume_descriptor *hdp;
668 struct iso_volume_descriptor *vdp;
669
670 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
671 if (!(bh = sb_bread(s, block)))
672 goto out_no_read;
673
674 vdp = (struct iso_volume_descriptor *)bh->b_data;
675 hdp = (struct hs_volume_descriptor *)bh->b_data;
676
677 /*
678 * Due to the overlapping physical location of the descriptors,
679 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
680 * proper identification in this case, we first check for ISO.
681 */
682 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
683 if (isonum_711(vdp->type) == ISO_VD_END)
684 break;
685 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
686 if (!pri) {
687 pri = (struct iso_primary_descriptor *)vdp;
688 /* Save the buffer in case we need it ... */
689 pri_bh = bh;
690 bh = NULL;
691 }
692 }
693#ifdef CONFIG_JOLIET
694 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
695 sec = (struct iso_supplementary_descriptor *)vdp;
696 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
697 if (opt.joliet) {
698 if (sec->escape[2] == 0x40)
699 joliet_level = 1;
700 else if (sec->escape[2] == 0x43)
701 joliet_level = 2;
702 else if (sec->escape[2] == 0x45)
703 joliet_level = 3;
704
705 printk(KERN_DEBUG "ISO 9660 Extensions: "
706 "Microsoft Joliet Level %d\n",
707 joliet_level);
708 }
709 goto root_found;
710 } else {
711 /* Unknown supplementary volume descriptor */
712 sec = NULL;
713 }
714 }
715#endif
716 } else {
717 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
718 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
719 goto out_freebh;
720
721 sbi->s_high_sierra = 1;
722 opt.rock = 0;
723 h_pri = (struct hs_primary_descriptor *)vdp;
724 goto root_found;
725 }
726 }
727
728 /* Just skip any volume descriptors we don't recognize */
729
730 brelse(bh);
731 bh = NULL;
732 }
733 /*
734 * If we fall through, either no volume descriptor was found,
735 * or else we passed a primary descriptor looking for others.
736 */
737 if (!pri)
738 goto out_unknown_format;
739 brelse(bh);
740 bh = pri_bh;
741 pri_bh = NULL;
742
743root_found:
744 /* We don't support read-write mounts */
745 if (!sb_rdonly(s)) {
746 error = -EACCES;
747 goto out_freebh;
748 }
749
750 if (joliet_level && (!pri || !opt.rock)) {
751 /* This is the case of Joliet with the norock mount flag.
752 * A disc with both Joliet and Rock Ridge is handled later
753 */
754 pri = (struct iso_primary_descriptor *) sec;
755 }
756
757 if(sbi->s_high_sierra){
758 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
759 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
760 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
761 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
762 } else {
763 if (!pri)
764 goto out_freebh;
765 rootp = (struct iso_directory_record *) pri->root_directory_record;
766 sbi->s_nzones = isonum_733(pri->volume_space_size);
767 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
768 sbi->s_max_size = isonum_733(pri->volume_space_size);
769 }
770
771 sbi->s_ninodes = 0; /* No way to figure this out easily */
772
773 orig_zonesize = sbi->s_log_zone_size;
774 /*
775 * If the zone size is smaller than the hardware sector size,
776 * this is a fatal error. This would occur if the disc drive
777 * had sectors that were 2048 bytes, but the filesystem had
778 * blocks that were 512 bytes (which should only very rarely
779 * happen.)
780 */
781 if (orig_zonesize < opt.blocksize)
782 goto out_bad_size;
783
784 /* RDE: convert log zone size to bit shift */
785 switch (sbi->s_log_zone_size) {
786 case 512: sbi->s_log_zone_size = 9; break;
787 case 1024: sbi->s_log_zone_size = 10; break;
788 case 2048: sbi->s_log_zone_size = 11; break;
789
790 default:
791 goto out_bad_zone_size;
792 }
793
794 s->s_magic = ISOFS_SUPER_MAGIC;
795
796 /*
797 * With multi-extent files, file size is only limited by the maximum
798 * size of a file system, which is 8 TB.
799 */
800 s->s_maxbytes = 0x80000000000LL;
801
802 /* ECMA-119 timestamp from 1900/1/1 with tz offset */
803 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
804 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
805
806 /* Set this for reference. Its not currently used except on write
807 which we don't have .. */
808
809 first_data_zone = isonum_733(rootp->extent) +
810 isonum_711(rootp->ext_attr_length);
811 sbi->s_firstdatazone = first_data_zone;
812#ifndef BEQUIET
813 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
814 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
815 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
816 if(sbi->s_high_sierra)
817 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
818#endif
819
820 /*
821 * If the Joliet level is set, we _may_ decide to use the
822 * secondary descriptor, but can't be sure until after we
823 * read the root inode. But before reading the root inode
824 * we may need to change the device blocksize, and would
825 * rather release the old buffer first. So, we cache the
826 * first_data_zone value from the secondary descriptor.
827 */
828 if (joliet_level) {
829 pri = (struct iso_primary_descriptor *) sec;
830 rootp = (struct iso_directory_record *)
831 pri->root_directory_record;
832 first_data_zone = isonum_733(rootp->extent) +
833 isonum_711(rootp->ext_attr_length);
834 }
835
836 /*
837 * We're all done using the volume descriptor, and may need
838 * to change the device blocksize, so release the buffer now.
839 */
840 brelse(pri_bh);
841 brelse(bh);
842
843 /*
844 * Force the blocksize to 512 for 512 byte sectors. The file
845 * read primitives really get it wrong in a bad way if we don't
846 * do this.
847 *
848 * Note - we should never be setting the blocksize to something
849 * less than the hardware sector size for the device. If we
850 * do, we would end up having to read larger buffers and split
851 * out portions to satisfy requests.
852 *
853 * Note2- the idea here is that we want to deal with the optimal
854 * zonesize in the filesystem. If we have it set to something less,
855 * then we have horrible problems with trying to piece together
856 * bits of adjacent blocks in order to properly read directory
857 * entries. By forcing the blocksize in this way, we ensure
858 * that we will never be required to do this.
859 */
860 sb_set_blocksize(s, orig_zonesize);
861
862 sbi->s_nls_iocharset = NULL;
863
864#ifdef CONFIG_JOLIET
865 if (joliet_level && opt.utf8 == 0) {
866 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
867 sbi->s_nls_iocharset = load_nls(p);
868 if (! sbi->s_nls_iocharset) {
869 /* Fail only if explicit charset specified */
870 if (opt.iocharset)
871 goto out_freesbi;
872 sbi->s_nls_iocharset = load_nls_default();
873 }
874 }
875#endif
876 s->s_op = &isofs_sops;
877 s->s_export_op = &isofs_export_ops;
878 sbi->s_mapping = opt.map;
879 sbi->s_rock = (opt.rock ? 2 : 0);
880 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
881 sbi->s_cruft = opt.cruft;
882 sbi->s_hide = opt.hide;
883 sbi->s_showassoc = opt.showassoc;
884 sbi->s_uid = opt.uid;
885 sbi->s_gid = opt.gid;
886 sbi->s_uid_set = opt.uid_set;
887 sbi->s_gid_set = opt.gid_set;
888 sbi->s_utf8 = opt.utf8;
889 sbi->s_nocompress = opt.nocompress;
890 sbi->s_overriderockperm = opt.overriderockperm;
891 /*
892 * It would be incredibly stupid to allow people to mark every file
893 * on the disk as suid, so we merely allow them to set the default
894 * permissions.
895 */
896 if (opt.fmode != ISOFS_INVALID_MODE)
897 sbi->s_fmode = opt.fmode & 0777;
898 else
899 sbi->s_fmode = ISOFS_INVALID_MODE;
900 if (opt.dmode != ISOFS_INVALID_MODE)
901 sbi->s_dmode = opt.dmode & 0777;
902 else
903 sbi->s_dmode = ISOFS_INVALID_MODE;
904
905 /*
906 * Read the root inode, which _may_ result in changing
907 * the s_rock flag. Once we have the final s_rock value,
908 * we then decide whether to use the Joliet descriptor.
909 */
910 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
911 if (IS_ERR(inode))
912 goto out_no_root;
913
914 /*
915 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
916 * correct Joliet root directory.
917 */
918 if (sbi->s_rock == 1 && joliet_level &&
919 rootdir_empty(s, sbi->s_firstdatazone)) {
920 printk(KERN_NOTICE
921 "ISOFS: primary root directory is empty. "
922 "Disabling Rock Ridge and switching to Joliet.");
923 sbi->s_rock = 0;
924 }
925
926 /*
927 * If this disk has both Rock Ridge and Joliet on it, then we
928 * want to use Rock Ridge by default. This can be overridden
929 * by using the norock mount option. There is still one other
930 * possibility that is not taken into account: a Rock Ridge
931 * CD with Unicode names. Until someone sees such a beast, it
932 * will not be supported.
933 */
934 if (sbi->s_rock == 1) {
935 joliet_level = 0;
936 } else if (joliet_level) {
937 sbi->s_rock = 0;
938 if (sbi->s_firstdatazone != first_data_zone) {
939 sbi->s_firstdatazone = first_data_zone;
940 printk(KERN_DEBUG
941 "ISOFS: changing to secondary root\n");
942 iput(inode);
943 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
944 if (IS_ERR(inode))
945 goto out_no_root;
946 }
947 }
948
949 if (opt.check == 'u') {
950 /* Only Joliet is case insensitive by default */
951 if (joliet_level)
952 opt.check = 'r';
953 else
954 opt.check = 's';
955 }
956 sbi->s_joliet_level = joliet_level;
957
958 /* Make sure the root inode is a directory */
959 if (!S_ISDIR(inode->i_mode)) {
960 printk(KERN_WARNING
961 "isofs_fill_super: root inode is not a directory. "
962 "Corrupted media?\n");
963 goto out_iput;
964 }
965
966 table = 0;
967 if (joliet_level)
968 table += 2;
969 if (opt.check == 'r')
970 table++;
971 sbi->s_check = opt.check;
972
973 if (table)
974 s->s_d_op = &isofs_dentry_ops[table - 1];
975
976 /* get the root dentry */
977 s->s_root = d_make_root(inode);
978 if (!(s->s_root)) {
979 error = -ENOMEM;
980 goto out_no_inode;
981 }
982
983 kfree(opt.iocharset);
984
985 return 0;
986
987 /*
988 * Display error messages and free resources.
989 */
990out_iput:
991 iput(inode);
992 goto out_no_inode;
993out_no_root:
994 error = PTR_ERR(inode);
995 if (error != -ENOMEM)
996 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
997out_no_inode:
998#ifdef CONFIG_JOLIET
999 unload_nls(sbi->s_nls_iocharset);
1000#endif
1001 goto out_freesbi;
1002out_no_read:
1003 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1004 __func__, s->s_id, iso_blknum, block);
1005 goto out_freebh;
1006out_bad_zone_size:
1007 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1008 sbi->s_log_zone_size);
1009 goto out_freebh;
1010out_bad_size:
1011 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1012 orig_zonesize, opt.blocksize);
1013 goto out_freebh;
1014out_unknown_format:
1015 if (!silent)
1016 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1017
1018out_freebh:
1019 brelse(bh);
1020 brelse(pri_bh);
1021out_freesbi:
1022 kfree(opt.iocharset);
1023 kfree(sbi);
1024 s->s_fs_info = NULL;
1025 return error;
1026}
1027
1028static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1029{
1030 struct super_block *sb = dentry->d_sb;
1031 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1032
1033 buf->f_type = ISOFS_SUPER_MAGIC;
1034 buf->f_bsize = sb->s_blocksize;
1035 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1036 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1037 buf->f_bfree = 0;
1038 buf->f_bavail = 0;
1039 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1040 buf->f_ffree = 0;
1041 buf->f_fsid.val[0] = (u32)id;
1042 buf->f_fsid.val[1] = (u32)(id >> 32);
1043 buf->f_namelen = NAME_MAX;
1044 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 */
1052int isofs_get_blocks(struct inode *inode, sector_t iblock,
1053 struct buffer_head **bh, unsigned long nblocks)
1054{
1055 unsigned long b_off = iblock;
1056 unsigned offset, sect_size;
1057 unsigned int firstext;
1058 unsigned long nextblk, nextoff;
1059 int section, rv, error;
1060 struct iso_inode_info *ei = ISOFS_I(inode);
1061
1062 error = -EIO;
1063 rv = 0;
1064 if (iblock != b_off) {
1065 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1066 goto abort;
1067 }
1068
1069
1070 offset = 0;
1071 firstext = ei->i_first_extent;
1072 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1073 nextblk = ei->i_next_section_block;
1074 nextoff = ei->i_next_section_offset;
1075 section = 0;
1076
1077 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 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1086 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1087 __func__, b_off,
1088 (unsigned long long)inode->i_size);
1089 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 while (nextblk && (b_off >= (offset + sect_size))) {
1097 struct inode *ninode;
1098
1099 offset += sect_size;
1100 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1101 if (IS_ERR(ninode)) {
1102 error = PTR_ERR(ninode);
1103 goto abort;
1104 }
1105 firstext = ISOFS_I(ninode)->i_first_extent;
1106 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1107 nextblk = ISOFS_I(ninode)->i_next_section_block;
1108 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1109 iput(ninode);
1110
1111 if (++section > 100) {
1112 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1113 " aborting...\n", __func__);
1114 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 goto abort;
1119 }
1120 }
1121
1122 if (*bh) {
1123 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1124 } else {
1125 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1126 if (!*bh)
1127 goto abort;
1128 }
1129 bh++; /* Next buffer head */
1130 b_off++; /* Next buffer offset */
1131 nblocks--;
1132 rv++;
1133 }
1134
1135 error = 0;
1136abort:
1137 return rv != 0 ? rv : error;
1138}
1139
1140/*
1141 * Used by the standard interfaces.
1142 */
1143static int isofs_get_block(struct inode *inode, sector_t iblock,
1144 struct buffer_head *bh_result, int create)
1145{
1146 int ret;
1147
1148 if (create) {
1149 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1150 return -EROFS;
1151 }
1152
1153 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1154 return ret < 0 ? ret : 0;
1155}
1156
1157static int isofs_bmap(struct inode *inode, sector_t block)
1158{
1159 struct buffer_head dummy;
1160 int error;
1161
1162 dummy.b_state = 0;
1163 dummy.b_blocknr = -1000;
1164 error = isofs_get_block(inode, block, &dummy, 0);
1165 if (!error)
1166 return dummy.b_blocknr;
1167 return 0;
1168}
1169
1170struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1171{
1172 sector_t blknr = isofs_bmap(inode, block);
1173 if (!blknr)
1174 return NULL;
1175 return sb_bread(inode->i_sb, blknr);
1176}
1177
1178static int isofs_readpage(struct file *file, struct page *page)
1179{
1180 return mpage_readpage(page, isofs_get_block);
1181}
1182
1183static void isofs_readahead(struct readahead_control *rac)
1184{
1185 mpage_readahead(rac, isofs_get_block);
1186}
1187
1188static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1189{
1190 return generic_block_bmap(mapping,block,isofs_get_block);
1191}
1192
1193static const struct address_space_operations isofs_aops = {
1194 .readpage = isofs_readpage,
1195 .readahead = isofs_readahead,
1196 .bmap = _isofs_bmap
1197};
1198
1199static int isofs_read_level3_size(struct inode *inode)
1200{
1201 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1202 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1203 struct buffer_head *bh = NULL;
1204 unsigned long block, offset, block_saved, offset_saved;
1205 int i = 0;
1206 int more_entries = 0;
1207 struct iso_directory_record *tmpde = NULL;
1208 struct iso_inode_info *ei = ISOFS_I(inode);
1209
1210 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 ei->i_next_section_block = 0;
1216 ei->i_next_section_offset = 0;
1217
1218 block = ei->i_iget5_block;
1219 offset = ei->i_iget5_offset;
1220
1221 do {
1222 struct iso_directory_record *de;
1223 unsigned int de_len;
1224
1225 if (!bh) {
1226 bh = sb_bread(inode->i_sb, block);
1227 if (!bh)
1228 goto out_noread;
1229 }
1230 de = (struct iso_directory_record *) (bh->b_data + offset);
1231 de_len = *(unsigned char *) de;
1232
1233 if (de_len == 0) {
1234 brelse(bh);
1235 bh = NULL;
1236 ++block;
1237 offset = 0;
1238 continue;
1239 }
1240
1241 block_saved = block;
1242 offset_saved = offset;
1243 offset += de_len;
1244
1245 /* Make sure we have a full directory entry */
1246 if (offset >= bufsize) {
1247 int slop = bufsize - offset + de_len;
1248 if (!tmpde) {
1249 tmpde = kmalloc(256, GFP_KERNEL);
1250 if (!tmpde)
1251 goto out_nomem;
1252 }
1253 memcpy(tmpde, de, slop);
1254 offset &= bufsize - 1;
1255 block++;
1256 brelse(bh);
1257 bh = NULL;
1258 if (offset) {
1259 bh = sb_bread(inode->i_sb, block);
1260 if (!bh)
1261 goto out_noread;
1262 memcpy((void *)tmpde+slop, bh->b_data, offset);
1263 }
1264 de = tmpde;
1265 }
1266
1267 inode->i_size += isonum_733(de->size);
1268 if (i == 1) {
1269 ei->i_next_section_block = block_saved;
1270 ei->i_next_section_offset = offset_saved;
1271 }
1272
1273 more_entries = de->flags[-high_sierra] & 0x80;
1274
1275 i++;
1276 if (i > 100)
1277 goto out_toomany;
1278 } while (more_entries);
1279out:
1280 kfree(tmpde);
1281 if (bh)
1282 brelse(bh);
1283 return 0;
1284
1285out_nomem:
1286 if (bh)
1287 brelse(bh);
1288 return -ENOMEM;
1289
1290out_noread:
1291 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1292 kfree(tmpde);
1293 return -EIO;
1294
1295out_toomany:
1296 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 goto out;
1300}
1301
1302static int isofs_read_inode(struct inode *inode, int relocated)
1303{
1304 struct super_block *sb = inode->i_sb;
1305 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1306 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1307 unsigned long block;
1308 int high_sierra = sbi->s_high_sierra;
1309 struct buffer_head *bh;
1310 struct iso_directory_record *de;
1311 struct iso_directory_record *tmpde = NULL;
1312 unsigned int de_len;
1313 unsigned long offset;
1314 struct iso_inode_info *ei = ISOFS_I(inode);
1315 int ret = -EIO;
1316
1317 block = ei->i_iget5_block;
1318 bh = sb_bread(inode->i_sb, block);
1319 if (!bh)
1320 goto out_badread;
1321
1322 offset = ei->i_iget5_offset;
1323
1324 de = (struct iso_directory_record *) (bh->b_data + offset);
1325 de_len = *(unsigned char *) de;
1326
1327 if (offset + de_len > bufsize) {
1328 int frag1 = bufsize - offset;
1329
1330 tmpde = kmalloc(de_len, GFP_KERNEL);
1331 if (!tmpde) {
1332 ret = -ENOMEM;
1333 goto fail;
1334 }
1335 memcpy(tmpde, bh->b_data + offset, frag1);
1336 brelse(bh);
1337 bh = sb_bread(inode->i_sb, ++block);
1338 if (!bh)
1339 goto out_badread;
1340 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1341 de = tmpde;
1342 }
1343
1344 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1345 ei->i_iget5_offset,
1346 ISOFS_BUFFER_BITS(inode));
1347
1348 /* Assume it is a normal-format file unless told otherwise */
1349 ei->i_file_format = isofs_file_normal;
1350
1351 if (de->flags[-high_sierra] & 2) {
1352 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1353 inode->i_mode = S_IFDIR | sbi->s_dmode;
1354 else
1355 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1356 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 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1365 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 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1373 }
1374 set_nlink(inode, 1);
1375 }
1376 inode->i_uid = sbi->s_uid;
1377 inode->i_gid = sbi->s_gid;
1378 inode->i_blocks = 0;
1379
1380 ei->i_format_parm[0] = 0;
1381 ei->i_format_parm[1] = 0;
1382 ei->i_format_parm[2] = 0;
1383
1384 ei->i_section_size = isonum_733(de->size);
1385 if (de->flags[-high_sierra] & 0x80) {
1386 ret = isofs_read_level3_size(inode);
1387 if (ret < 0)
1388 goto fail;
1389 ret = -EIO;
1390 } else {
1391 ei->i_next_section_block = 0;
1392 ei->i_next_section_offset = 0;
1393 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 if (sbi->s_cruft)
1403 inode->i_size &= 0x00ffffff;
1404
1405 if (de->interleave[0]) {
1406 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1407 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 if (de->file_unit_size[0] != 0) {
1413 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 inode->i_mtime.tv_sec =
1428 inode->i_atime.tv_sec =
1429 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1430 inode->i_mtime.tv_nsec =
1431 inode->i_atime.tv_nsec =
1432 inode->i_ctime.tv_nsec = 0;
1433
1434 ei->i_first_extent = (isonum_733(de->extent) +
1435 isonum_711(de->ext_attr_length));
1436
1437 /* Set the number of blocks for stat() - should be done before RR */
1438 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 if (!high_sierra) {
1446 parse_rock_ridge_inode(de, inode, relocated);
1447 /* if we want uid/gid set, override the rock ridge setting */
1448 if (sbi->s_uid_set)
1449 inode->i_uid = sbi->s_uid;
1450 if (sbi->s_gid_set)
1451 inode->i_gid = sbi->s_gid;
1452 }
1453 /* Now set final access rights if overriding rock ridge setting */
1454 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1455 sbi->s_dmode != ISOFS_INVALID_MODE)
1456 inode->i_mode = S_IFDIR | sbi->s_dmode;
1457 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1458 sbi->s_fmode != ISOFS_INVALID_MODE)
1459 inode->i_mode = S_IFREG | sbi->s_fmode;
1460
1461 /* Install the inode operations vector */
1462 if (S_ISREG(inode->i_mode)) {
1463 inode->i_fop = &generic_ro_fops;
1464 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 inode->i_data.a_ops = &isofs_aops;
1472 break;
1473 }
1474 } else if (S_ISDIR(inode->i_mode)) {
1475 inode->i_op = &isofs_dir_inode_operations;
1476 inode->i_fop = &isofs_dir_operations;
1477 } else if (S_ISLNK(inode->i_mode)) {
1478 inode->i_op = &page_symlink_inode_operations;
1479 inode_nohighmem(inode);
1480 inode->i_data.a_ops = &isofs_symlink_aops;
1481 } else
1482 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1483 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1484
1485 ret = 0;
1486out:
1487 kfree(tmpde);
1488 if (bh)
1489 brelse(bh);
1490 return ret;
1491
1492out_badread:
1493 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1494fail:
1495 goto out;
1496}
1497
1498struct isofs_iget5_callback_data {
1499 unsigned long block;
1500 unsigned long offset;
1501};
1502
1503static int isofs_iget5_test(struct inode *ino, void *data)
1504{
1505 struct iso_inode_info *i = ISOFS_I(ino);
1506 struct isofs_iget5_callback_data *d =
1507 (struct isofs_iget5_callback_data*)data;
1508 return (i->i_iget5_block == d->block)
1509 && (i->i_iget5_offset == d->offset);
1510}
1511
1512static int isofs_iget5_set(struct inode *ino, void *data)
1513{
1514 struct iso_inode_info *i = ISOFS_I(ino);
1515 struct isofs_iget5_callback_data *d =
1516 (struct isofs_iget5_callback_data*)data;
1517 i->i_iget5_block = d->block;
1518 i->i_iget5_offset = d->offset;
1519 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 */
1526struct inode *__isofs_iget(struct super_block *sb,
1527 unsigned long block,
1528 unsigned long offset,
1529 int relocated)
1530{
1531 unsigned long hashval;
1532 struct inode *inode;
1533 struct isofs_iget5_callback_data data;
1534 long ret;
1535
1536 if (offset >= 1ul << sb->s_blocksize_bits)
1537 return ERR_PTR(-EINVAL);
1538
1539 data.block = block;
1540 data.offset = offset;
1541
1542 hashval = (block << sb->s_blocksize_bits) | offset;
1543
1544 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1545 &isofs_iget5_set, &data);
1546
1547 if (!inode)
1548 return ERR_PTR(-ENOMEM);
1549
1550 if (inode->i_state & I_NEW) {
1551 ret = isofs_read_inode(inode, relocated);
1552 if (ret < 0) {
1553 iget_failed(inode);
1554 inode = ERR_PTR(ret);
1555 } else {
1556 unlock_new_inode(inode);
1557 }
1558 }
1559
1560 return inode;
1561}
1562
1563static struct dentry *isofs_mount(struct file_system_type *fs_type,
1564 int flags, const char *dev_name, void *data)
1565{
1566 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1567}
1568
1569static 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};
1576MODULE_ALIAS_FS("iso9660");
1577MODULE_ALIAS("iso9660");
1578
1579static int __init init_iso9660_fs(void)
1580{
1581 int err = init_inodecache();
1582 if (err)
1583 goto out;
1584#ifdef CONFIG_ZISOFS
1585 err = zisofs_init();
1586 if (err)
1587 goto out1;
1588#endif
1589 err = register_filesystem(&iso9660_fs_type);
1590 if (err)
1591 goto out2;
1592 return 0;
1593out2:
1594#ifdef CONFIG_ZISOFS
1595 zisofs_cleanup();
1596out1:
1597#endif
1598 destroy_inodecache();
1599out:
1600 return err;
1601}
1602
1603static void __exit exit_iso9660_fs(void)
1604{
1605 unregister_filesystem(&iso9660_fs_type);
1606#ifdef CONFIG_ZISOFS
1607 zisofs_cleanup();
1608#endif
1609 destroy_inodecache();
1610}
1611
1612module_init(init_iso9660_fs)
1613module_exit(exit_iso9660_fs)
1614MODULE_LICENSE("GPL");