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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
24#include "isofs.h"
25#include "zisofs.h"
26
27#define BEQUIET
28
29static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
30 struct qstr *qstr);
31static int isofs_hash(const struct dentry *parent, const struct inode *inode,
32 struct qstr *qstr);
33static int isofs_dentry_cmpi(const struct dentry *parent,
34 const struct inode *pinode,
35 const struct dentry *dentry, const struct inode *inode,
36 unsigned int len, const char *str, const struct qstr *name);
37static int isofs_dentry_cmp(const struct dentry *parent,
38 const struct inode *pinode,
39 const struct dentry *dentry, const struct inode *inode,
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, const struct inode *inode,
44 struct qstr *qstr);
45static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
46 struct qstr *qstr);
47static int isofs_dentry_cmpi_ms(const struct dentry *parent,
48 const struct inode *pinode,
49 const struct dentry *dentry, const struct inode *inode,
50 unsigned int len, const char *str, const struct qstr *name);
51static int isofs_dentry_cmp_ms(const struct dentry *parent,
52 const struct inode *pinode,
53 const struct dentry *dentry, const struct inode *inode,
54 unsigned int len, const char *str, const struct qstr *name);
55#endif
56
57static void isofs_put_super(struct super_block *sb)
58{
59 struct isofs_sb_info *sbi = ISOFS_SB(sb);
60
61#ifdef CONFIG_JOLIET
62 unload_nls(sbi->s_nls_iocharset);
63#endif
64
65 kfree(sbi);
66 sb->s_fs_info = NULL;
67 return;
68}
69
70static int isofs_read_inode(struct inode *);
71static int isofs_statfs (struct dentry *, struct kstatfs *);
72
73static struct kmem_cache *isofs_inode_cachep;
74
75static struct inode *isofs_alloc_inode(struct super_block *sb)
76{
77 struct iso_inode_info *ei;
78 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
79 if (!ei)
80 return NULL;
81 return &ei->vfs_inode;
82}
83
84static void isofs_i_callback(struct rcu_head *head)
85{
86 struct inode *inode = container_of(head, struct inode, i_rcu);
87 INIT_LIST_HEAD(&inode->i_dentry);
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 mode_t fmode;
173 mode_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_alloc_root(inode);
951 if (!(s->s_root))
952 goto out_no_root;
953
954 kfree(opt.iocharset);
955
956 return 0;
957
958 /*
959 * Display error messages and free resources.
960 */
961out_iput:
962 iput(inode);
963 goto out_no_inode;
964out_no_root:
965 error = PTR_ERR(inode);
966 if (error != -ENOMEM)
967 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
968out_no_inode:
969#ifdef CONFIG_JOLIET
970 unload_nls(sbi->s_nls_iocharset);
971#endif
972 goto out_freesbi;
973out_no_read:
974 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
975 __func__, s->s_id, iso_blknum, block);
976 goto out_freebh;
977out_bad_zone_size:
978 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
979 sbi->s_log_zone_size);
980 goto out_freebh;
981out_bad_size:
982 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
983 orig_zonesize, opt.blocksize);
984 goto out_freebh;
985out_unknown_format:
986 if (!silent)
987 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
988
989out_freebh:
990 brelse(bh);
991 brelse(pri_bh);
992out_freesbi:
993 kfree(opt.iocharset);
994 kfree(sbi);
995 s->s_fs_info = NULL;
996 return error;
997}
998
999static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1000{
1001 struct super_block *sb = dentry->d_sb;
1002 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1003
1004 buf->f_type = ISOFS_SUPER_MAGIC;
1005 buf->f_bsize = sb->s_blocksize;
1006 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1007 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1008 buf->f_bfree = 0;
1009 buf->f_bavail = 0;
1010 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1011 buf->f_ffree = 0;
1012 buf->f_fsid.val[0] = (u32)id;
1013 buf->f_fsid.val[1] = (u32)(id >> 32);
1014 buf->f_namelen = NAME_MAX;
1015 return 0;
1016}
1017
1018/*
1019 * Get a set of blocks; filling in buffer_heads if already allocated
1020 * or getblk() if they are not. Returns the number of blocks inserted
1021 * (-ve == error.)
1022 */
1023int isofs_get_blocks(struct inode *inode, sector_t iblock,
1024 struct buffer_head **bh, unsigned long nblocks)
1025{
1026 unsigned long b_off = iblock;
1027 unsigned offset, sect_size;
1028 unsigned int firstext;
1029 unsigned long nextblk, nextoff;
1030 int section, rv, error;
1031 struct iso_inode_info *ei = ISOFS_I(inode);
1032
1033 error = -EIO;
1034 rv = 0;
1035 if (iblock != b_off) {
1036 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1037 goto abort;
1038 }
1039
1040
1041 offset = 0;
1042 firstext = ei->i_first_extent;
1043 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1044 nextblk = ei->i_next_section_block;
1045 nextoff = ei->i_next_section_offset;
1046 section = 0;
1047
1048 while (nblocks) {
1049 /* If we are *way* beyond the end of the file, print a message.
1050 * Access beyond the end of the file up to the next page boundary
1051 * is normal, however because of the way the page cache works.
1052 * In this case, we just return 0 so that we can properly fill
1053 * the page with useless information without generating any
1054 * I/O errors.
1055 */
1056 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1057 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1058 __func__, b_off,
1059 (unsigned long long)inode->i_size);
1060 goto abort;
1061 }
1062
1063 /* On the last section, nextblk == 0, section size is likely to
1064 * exceed sect_size by a partial block, and access beyond the
1065 * end of the file will reach beyond the section size, too.
1066 */
1067 while (nextblk && (b_off >= (offset + sect_size))) {
1068 struct inode *ninode;
1069
1070 offset += sect_size;
1071 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1072 if (IS_ERR(ninode)) {
1073 error = PTR_ERR(ninode);
1074 goto abort;
1075 }
1076 firstext = ISOFS_I(ninode)->i_first_extent;
1077 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1078 nextblk = ISOFS_I(ninode)->i_next_section_block;
1079 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1080 iput(ninode);
1081
1082 if (++section > 100) {
1083 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1084 " aborting...\n", __func__);
1085 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1086 "nextblk=%lu nextoff=%lu\n", __func__,
1087 b_off, firstext, (unsigned) sect_size,
1088 nextblk, nextoff);
1089 goto abort;
1090 }
1091 }
1092
1093 if (*bh) {
1094 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1095 } else {
1096 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1097 if (!*bh)
1098 goto abort;
1099 }
1100 bh++; /* Next buffer head */
1101 b_off++; /* Next buffer offset */
1102 nblocks--;
1103 rv++;
1104 }
1105
1106 error = 0;
1107abort:
1108 return rv != 0 ? rv : error;
1109}
1110
1111/*
1112 * Used by the standard interfaces.
1113 */
1114static int isofs_get_block(struct inode *inode, sector_t iblock,
1115 struct buffer_head *bh_result, int create)
1116{
1117 int ret;
1118
1119 if (create) {
1120 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1121 return -EROFS;
1122 }
1123
1124 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1125 return ret < 0 ? ret : 0;
1126}
1127
1128static int isofs_bmap(struct inode *inode, sector_t block)
1129{
1130 struct buffer_head dummy;
1131 int error;
1132
1133 dummy.b_state = 0;
1134 dummy.b_blocknr = -1000;
1135 error = isofs_get_block(inode, block, &dummy, 0);
1136 if (!error)
1137 return dummy.b_blocknr;
1138 return 0;
1139}
1140
1141struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1142{
1143 sector_t blknr = isofs_bmap(inode, block);
1144 if (!blknr)
1145 return NULL;
1146 return sb_bread(inode->i_sb, blknr);
1147}
1148
1149static int isofs_readpage(struct file *file, struct page *page)
1150{
1151 return block_read_full_page(page,isofs_get_block);
1152}
1153
1154static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1155{
1156 return generic_block_bmap(mapping,block,isofs_get_block);
1157}
1158
1159static const struct address_space_operations isofs_aops = {
1160 .readpage = isofs_readpage,
1161 .bmap = _isofs_bmap
1162};
1163
1164static int isofs_read_level3_size(struct inode *inode)
1165{
1166 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1167 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1168 struct buffer_head *bh = NULL;
1169 unsigned long block, offset, block_saved, offset_saved;
1170 int i = 0;
1171 int more_entries = 0;
1172 struct iso_directory_record *tmpde = NULL;
1173 struct iso_inode_info *ei = ISOFS_I(inode);
1174
1175 inode->i_size = 0;
1176
1177 /* The first 16 blocks are reserved as the System Area. Thus,
1178 * no inodes can appear in block 0. We use this to flag that
1179 * this is the last section. */
1180 ei->i_next_section_block = 0;
1181 ei->i_next_section_offset = 0;
1182
1183 block = ei->i_iget5_block;
1184 offset = ei->i_iget5_offset;
1185
1186 do {
1187 struct iso_directory_record *de;
1188 unsigned int de_len;
1189
1190 if (!bh) {
1191 bh = sb_bread(inode->i_sb, block);
1192 if (!bh)
1193 goto out_noread;
1194 }
1195 de = (struct iso_directory_record *) (bh->b_data + offset);
1196 de_len = *(unsigned char *) de;
1197
1198 if (de_len == 0) {
1199 brelse(bh);
1200 bh = NULL;
1201 ++block;
1202 offset = 0;
1203 continue;
1204 }
1205
1206 block_saved = block;
1207 offset_saved = offset;
1208 offset += de_len;
1209
1210 /* Make sure we have a full directory entry */
1211 if (offset >= bufsize) {
1212 int slop = bufsize - offset + de_len;
1213 if (!tmpde) {
1214 tmpde = kmalloc(256, GFP_KERNEL);
1215 if (!tmpde)
1216 goto out_nomem;
1217 }
1218 memcpy(tmpde, de, slop);
1219 offset &= bufsize - 1;
1220 block++;
1221 brelse(bh);
1222 bh = NULL;
1223 if (offset) {
1224 bh = sb_bread(inode->i_sb, block);
1225 if (!bh)
1226 goto out_noread;
1227 memcpy((void *)tmpde+slop, bh->b_data, offset);
1228 }
1229 de = tmpde;
1230 }
1231
1232 inode->i_size += isonum_733(de->size);
1233 if (i == 1) {
1234 ei->i_next_section_block = block_saved;
1235 ei->i_next_section_offset = offset_saved;
1236 }
1237
1238 more_entries = de->flags[-high_sierra] & 0x80;
1239
1240 i++;
1241 if (i > 100)
1242 goto out_toomany;
1243 } while (more_entries);
1244out:
1245 kfree(tmpde);
1246 if (bh)
1247 brelse(bh);
1248 return 0;
1249
1250out_nomem:
1251 if (bh)
1252 brelse(bh);
1253 return -ENOMEM;
1254
1255out_noread:
1256 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1257 kfree(tmpde);
1258 return -EIO;
1259
1260out_toomany:
1261 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1262 "isofs_read_level3_size: inode=%lu\n",
1263 __func__, inode->i_ino);
1264 goto out;
1265}
1266
1267static int isofs_read_inode(struct inode *inode)
1268{
1269 struct super_block *sb = inode->i_sb;
1270 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1271 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1272 unsigned long block;
1273 int high_sierra = sbi->s_high_sierra;
1274 struct buffer_head *bh = NULL;
1275 struct iso_directory_record *de;
1276 struct iso_directory_record *tmpde = NULL;
1277 unsigned int de_len;
1278 unsigned long offset;
1279 struct iso_inode_info *ei = ISOFS_I(inode);
1280 int ret = -EIO;
1281
1282 block = ei->i_iget5_block;
1283 bh = sb_bread(inode->i_sb, block);
1284 if (!bh)
1285 goto out_badread;
1286
1287 offset = ei->i_iget5_offset;
1288
1289 de = (struct iso_directory_record *) (bh->b_data + offset);
1290 de_len = *(unsigned char *) de;
1291
1292 if (offset + de_len > bufsize) {
1293 int frag1 = bufsize - offset;
1294
1295 tmpde = kmalloc(de_len, GFP_KERNEL);
1296 if (tmpde == NULL) {
1297 printk(KERN_INFO "%s: out of memory\n", __func__);
1298 ret = -ENOMEM;
1299 goto fail;
1300 }
1301 memcpy(tmpde, bh->b_data + offset, frag1);
1302 brelse(bh);
1303 bh = sb_bread(inode->i_sb, ++block);
1304 if (!bh)
1305 goto out_badread;
1306 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1307 de = tmpde;
1308 }
1309
1310 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1311 ei->i_iget5_offset,
1312 ISOFS_BUFFER_BITS(inode));
1313
1314 /* Assume it is a normal-format file unless told otherwise */
1315 ei->i_file_format = isofs_file_normal;
1316
1317 if (de->flags[-high_sierra] & 2) {
1318 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1319 inode->i_mode = S_IFDIR | sbi->s_dmode;
1320 else
1321 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1322 inode->i_nlink = 1; /*
1323 * Set to 1. We know there are 2, but
1324 * the find utility tries to optimize
1325 * if it is 2, and it screws up. It is
1326 * easier to give 1 which tells find to
1327 * do it the hard way.
1328 */
1329 } else {
1330 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1331 inode->i_mode = S_IFREG | sbi->s_fmode;
1332 } else {
1333 /*
1334 * Set default permissions: r-x for all. The disc
1335 * could be shared with DOS machines so virtually
1336 * anything could be a valid executable.
1337 */
1338 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1339 }
1340 inode->i_nlink = 1;
1341 }
1342 inode->i_uid = sbi->s_uid;
1343 inode->i_gid = sbi->s_gid;
1344 inode->i_blocks = 0;
1345
1346 ei->i_format_parm[0] = 0;
1347 ei->i_format_parm[1] = 0;
1348 ei->i_format_parm[2] = 0;
1349
1350 ei->i_section_size = isonum_733(de->size);
1351 if (de->flags[-high_sierra] & 0x80) {
1352 ret = isofs_read_level3_size(inode);
1353 if (ret < 0)
1354 goto fail;
1355 ret = -EIO;
1356 } else {
1357 ei->i_next_section_block = 0;
1358 ei->i_next_section_offset = 0;
1359 inode->i_size = isonum_733(de->size);
1360 }
1361
1362 /*
1363 * Some dipshit decided to store some other bit of information
1364 * in the high byte of the file length. Truncate size in case
1365 * this CDROM was mounted with the cruft option.
1366 */
1367
1368 if (sbi->s_cruft)
1369 inode->i_size &= 0x00ffffff;
1370
1371 if (de->interleave[0]) {
1372 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1373 inode->i_size = 0;
1374 }
1375
1376 /* I have no idea what file_unit_size is used for, so
1377 we will flag it for now */
1378 if (de->file_unit_size[0] != 0) {
1379 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1380 inode->i_ino);
1381 }
1382
1383 /* I have no idea what other flag bits are used for, so
1384 we will flag it for now */
1385#ifdef DEBUG
1386 if((de->flags[-high_sierra] & ~2)!= 0){
1387 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1388 "(%ld %x).\n",
1389 inode->i_ino, de->flags[-high_sierra]);
1390 }
1391#endif
1392
1393 inode->i_mtime.tv_sec =
1394 inode->i_atime.tv_sec =
1395 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1396 inode->i_mtime.tv_nsec =
1397 inode->i_atime.tv_nsec =
1398 inode->i_ctime.tv_nsec = 0;
1399
1400 ei->i_first_extent = (isonum_733(de->extent) +
1401 isonum_711(de->ext_attr_length));
1402
1403 /* Set the number of blocks for stat() - should be done before RR */
1404 inode->i_blocks = (inode->i_size + 511) >> 9;
1405
1406 /*
1407 * Now test for possible Rock Ridge extensions which will override
1408 * some of these numbers in the inode structure.
1409 */
1410
1411 if (!high_sierra) {
1412 parse_rock_ridge_inode(de, inode);
1413 /* if we want uid/gid set, override the rock ridge setting */
1414 if (sbi->s_uid_set)
1415 inode->i_uid = sbi->s_uid;
1416 if (sbi->s_gid_set)
1417 inode->i_gid = sbi->s_gid;
1418 }
1419 /* Now set final access rights if overriding rock ridge setting */
1420 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1421 sbi->s_dmode != ISOFS_INVALID_MODE)
1422 inode->i_mode = S_IFDIR | sbi->s_dmode;
1423 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1424 sbi->s_fmode != ISOFS_INVALID_MODE)
1425 inode->i_mode = S_IFREG | sbi->s_fmode;
1426
1427 /* Install the inode operations vector */
1428 if (S_ISREG(inode->i_mode)) {
1429 inode->i_fop = &generic_ro_fops;
1430 switch (ei->i_file_format) {
1431#ifdef CONFIG_ZISOFS
1432 case isofs_file_compressed:
1433 inode->i_data.a_ops = &zisofs_aops;
1434 break;
1435#endif
1436 default:
1437 inode->i_data.a_ops = &isofs_aops;
1438 break;
1439 }
1440 } else if (S_ISDIR(inode->i_mode)) {
1441 inode->i_op = &isofs_dir_inode_operations;
1442 inode->i_fop = &isofs_dir_operations;
1443 } else if (S_ISLNK(inode->i_mode)) {
1444 inode->i_op = &page_symlink_inode_operations;
1445 inode->i_data.a_ops = &isofs_symlink_aops;
1446 } else
1447 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1448 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1449
1450 ret = 0;
1451out:
1452 kfree(tmpde);
1453 if (bh)
1454 brelse(bh);
1455 return ret;
1456
1457out_badread:
1458 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1459fail:
1460 goto out;
1461}
1462
1463struct isofs_iget5_callback_data {
1464 unsigned long block;
1465 unsigned long offset;
1466};
1467
1468static int isofs_iget5_test(struct inode *ino, void *data)
1469{
1470 struct iso_inode_info *i = ISOFS_I(ino);
1471 struct isofs_iget5_callback_data *d =
1472 (struct isofs_iget5_callback_data*)data;
1473 return (i->i_iget5_block == d->block)
1474 && (i->i_iget5_offset == d->offset);
1475}
1476
1477static int isofs_iget5_set(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 i->i_iget5_block = d->block;
1483 i->i_iget5_offset = d->offset;
1484 return 0;
1485}
1486
1487/* Store, in the inode's containing structure, the block and block
1488 * offset that point to the underlying meta-data for the inode. The
1489 * code below is otherwise similar to the iget() code in
1490 * include/linux/fs.h */
1491struct inode *isofs_iget(struct super_block *sb,
1492 unsigned long block,
1493 unsigned long offset)
1494{
1495 unsigned long hashval;
1496 struct inode *inode;
1497 struct isofs_iget5_callback_data data;
1498 long ret;
1499
1500 if (offset >= 1ul << sb->s_blocksize_bits)
1501 return ERR_PTR(-EINVAL);
1502
1503 data.block = block;
1504 data.offset = offset;
1505
1506 hashval = (block << sb->s_blocksize_bits) | offset;
1507
1508 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1509 &isofs_iget5_set, &data);
1510
1511 if (!inode)
1512 return ERR_PTR(-ENOMEM);
1513
1514 if (inode->i_state & I_NEW) {
1515 ret = isofs_read_inode(inode);
1516 if (ret < 0) {
1517 iget_failed(inode);
1518 inode = ERR_PTR(ret);
1519 } else {
1520 unlock_new_inode(inode);
1521 }
1522 }
1523
1524 return inode;
1525}
1526
1527static struct dentry *isofs_mount(struct file_system_type *fs_type,
1528 int flags, const char *dev_name, void *data)
1529{
1530 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1531}
1532
1533static struct file_system_type iso9660_fs_type = {
1534 .owner = THIS_MODULE,
1535 .name = "iso9660",
1536 .mount = isofs_mount,
1537 .kill_sb = kill_block_super,
1538 .fs_flags = FS_REQUIRES_DEV,
1539};
1540
1541static int __init init_iso9660_fs(void)
1542{
1543 int err = init_inodecache();
1544 if (err)
1545 goto out;
1546#ifdef CONFIG_ZISOFS
1547 err = zisofs_init();
1548 if (err)
1549 goto out1;
1550#endif
1551 err = register_filesystem(&iso9660_fs_type);
1552 if (err)
1553 goto out2;
1554 return 0;
1555out2:
1556#ifdef CONFIG_ZISOFS
1557 zisofs_cleanup();
1558out1:
1559#endif
1560 destroy_inodecache();
1561out:
1562 return err;
1563}
1564
1565static void __exit exit_iso9660_fs(void)
1566{
1567 unregister_filesystem(&iso9660_fs_type);
1568#ifdef CONFIG_ZISOFS
1569 zisofs_cleanup();
1570#endif
1571 destroy_inodecache();
1572}
1573
1574module_init(init_iso9660_fs)
1575module_exit(exit_iso9660_fs)
1576MODULE_LICENSE("GPL");
1577/* Actual filesystem name is iso9660, as requested in filesystems.c */
1578MODULE_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_multisession ms_info;
548 unsigned int vol_desc_start;
549 struct block_device *bdev = sb->s_bdev;
550 int i;
551
552 vol_desc_start=0;
553 ms_info.addr_format=CDROM_LBA;
554 if (session > 0) {
555 struct cdrom_tocentry Te;
556 Te.cdte_track=session;
557 Te.cdte_format=CDROM_LBA;
558 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
559 if (!i) {
560 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
561 session, Te.cdte_addr.lba,
562 Te.cdte_ctrl&CDROM_DATA_TRACK);
563 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
564 return Te.cdte_addr.lba;
565 }
566
567 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
568 }
569 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
570 if (session > 0)
571 printk(KERN_ERR "ISOFS: Invalid session number\n");
572#if 0
573 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
574 if (i==0) {
575 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
576 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
577 }
578#endif
579 if (i==0)
580#if WE_OBEY_THE_WRITTEN_STANDARDS
581 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
582#endif
583 vol_desc_start=ms_info.addr.lba;
584 return vol_desc_start;
585}
586
587/*
588 * Check if root directory is empty (has less than 3 files).
589 *
590 * Used to detect broken CDs where ISO root directory is empty but Joliet root
591 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
592 * (and Joliet used instead) or else no files would be visible.
593 */
594static bool rootdir_empty(struct super_block *sb, unsigned long block)
595{
596 int offset = 0, files = 0, de_len;
597 struct iso_directory_record *de;
598 struct buffer_head *bh;
599
600 bh = sb_bread(sb, block);
601 if (!bh)
602 return true;
603 while (files < 3) {
604 de = (struct iso_directory_record *) (bh->b_data + offset);
605 de_len = *(unsigned char *) de;
606 if (de_len == 0)
607 break;
608 files++;
609 offset += de_len;
610 }
611 brelse(bh);
612 return files < 3;
613}
614
615/*
616 * Initialize the superblock and read the root inode.
617 *
618 * Note: a check_disk_change() has been done immediately prior
619 * to this call, so we don't need to check again.
620 */
621static int isofs_fill_super(struct super_block *s, void *data, int silent)
622{
623 struct buffer_head *bh = NULL, *pri_bh = NULL;
624 struct hs_primary_descriptor *h_pri = NULL;
625 struct iso_primary_descriptor *pri = NULL;
626 struct iso_supplementary_descriptor *sec = NULL;
627 struct iso_directory_record *rootp;
628 struct inode *inode;
629 struct iso9660_options opt;
630 struct isofs_sb_info *sbi;
631 unsigned long first_data_zone;
632 int joliet_level = 0;
633 int iso_blknum, block;
634 int orig_zonesize;
635 int table, error = -EINVAL;
636 unsigned int vol_desc_start;
637
638 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
639 if (!sbi)
640 return -ENOMEM;
641 s->s_fs_info = sbi;
642
643 if (!parse_options((char *)data, &opt))
644 goto out_freesbi;
645
646 /*
647 * First of all, get the hardware blocksize for this device.
648 * If we don't know what it is, or the hardware blocksize is
649 * larger than the blocksize the user specified, then use
650 * that value.
651 */
652 /*
653 * What if bugger tells us to go beyond page size?
654 */
655 if (bdev_logical_block_size(s->s_bdev) > 2048) {
656 printk(KERN_WARNING
657 "ISOFS: unsupported/invalid hardware sector size %d\n",
658 bdev_logical_block_size(s->s_bdev));
659 goto out_freesbi;
660 }
661 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
662
663 sbi->s_high_sierra = 0; /* default is iso9660 */
664 sbi->s_session = opt.session;
665 sbi->s_sbsector = opt.sbsector;
666
667 vol_desc_start = (opt.sbsector != -1) ?
668 opt.sbsector : isofs_get_last_session(s,opt.session);
669
670 for (iso_blknum = vol_desc_start+16;
671 iso_blknum < vol_desc_start+100; iso_blknum++) {
672 struct hs_volume_descriptor *hdp;
673 struct iso_volume_descriptor *vdp;
674
675 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
676 if (!(bh = sb_bread(s, block)))
677 goto out_no_read;
678
679 vdp = (struct iso_volume_descriptor *)bh->b_data;
680 hdp = (struct hs_volume_descriptor *)bh->b_data;
681
682 /*
683 * Due to the overlapping physical location of the descriptors,
684 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
685 * proper identification in this case, we first check for ISO.
686 */
687 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
688 if (isonum_711(vdp->type) == ISO_VD_END)
689 break;
690 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
691 if (!pri) {
692 pri = (struct iso_primary_descriptor *)vdp;
693 /* Save the buffer in case we need it ... */
694 pri_bh = bh;
695 bh = NULL;
696 }
697 }
698#ifdef CONFIG_JOLIET
699 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
700 sec = (struct iso_supplementary_descriptor *)vdp;
701 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
702 if (opt.joliet) {
703 if (sec->escape[2] == 0x40)
704 joliet_level = 1;
705 else if (sec->escape[2] == 0x43)
706 joliet_level = 2;
707 else if (sec->escape[2] == 0x45)
708 joliet_level = 3;
709
710 printk(KERN_DEBUG "ISO 9660 Extensions: "
711 "Microsoft Joliet Level %d\n",
712 joliet_level);
713 }
714 goto root_found;
715 } else {
716 /* Unknown supplementary volume descriptor */
717 sec = NULL;
718 }
719 }
720#endif
721 } else {
722 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
723 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
724 goto out_freebh;
725
726 sbi->s_high_sierra = 1;
727 opt.rock = 0;
728 h_pri = (struct hs_primary_descriptor *)vdp;
729 goto root_found;
730 }
731 }
732
733 /* Just skip any volume descriptors we don't recognize */
734
735 brelse(bh);
736 bh = NULL;
737 }
738 /*
739 * If we fall through, either no volume descriptor was found,
740 * or else we passed a primary descriptor looking for others.
741 */
742 if (!pri)
743 goto out_unknown_format;
744 brelse(bh);
745 bh = pri_bh;
746 pri_bh = NULL;
747
748root_found:
749 /* We don't support read-write mounts */
750 if (!sb_rdonly(s)) {
751 error = -EACCES;
752 goto out_freebh;
753 }
754
755 if (joliet_level && (!pri || !opt.rock)) {
756 /* This is the case of Joliet with the norock mount flag.
757 * A disc with both Joliet and Rock Ridge is handled later
758 */
759 pri = (struct iso_primary_descriptor *) sec;
760 }
761
762 if(sbi->s_high_sierra){
763 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
764 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
765 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
766 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
767 } else {
768 if (!pri)
769 goto out_freebh;
770 rootp = (struct iso_directory_record *) pri->root_directory_record;
771 sbi->s_nzones = isonum_733(pri->volume_space_size);
772 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
773 sbi->s_max_size = isonum_733(pri->volume_space_size);
774 }
775
776 sbi->s_ninodes = 0; /* No way to figure this out easily */
777
778 orig_zonesize = sbi->s_log_zone_size;
779 /*
780 * If the zone size is smaller than the hardware sector size,
781 * this is a fatal error. This would occur if the disc drive
782 * had sectors that were 2048 bytes, but the filesystem had
783 * blocks that were 512 bytes (which should only very rarely
784 * happen.)
785 */
786 if (orig_zonesize < opt.blocksize)
787 goto out_bad_size;
788
789 /* RDE: convert log zone size to bit shift */
790 switch (sbi->s_log_zone_size) {
791 case 512: sbi->s_log_zone_size = 9; break;
792 case 1024: sbi->s_log_zone_size = 10; break;
793 case 2048: sbi->s_log_zone_size = 11; break;
794
795 default:
796 goto out_bad_zone_size;
797 }
798
799 s->s_magic = ISOFS_SUPER_MAGIC;
800
801 /*
802 * With multi-extent files, file size is only limited by the maximum
803 * size of a file system, which is 8 TB.
804 */
805 s->s_maxbytes = 0x80000000000LL;
806
807 /* ECMA-119 timestamp from 1900/1/1 with tz offset */
808 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
809 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
810
811 /* Set this for reference. Its not currently used except on write
812 which we don't have .. */
813
814 first_data_zone = isonum_733(rootp->extent) +
815 isonum_711(rootp->ext_attr_length);
816 sbi->s_firstdatazone = first_data_zone;
817#ifndef BEQUIET
818 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
819 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
820 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
821 if(sbi->s_high_sierra)
822 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
823#endif
824
825 /*
826 * If the Joliet level is set, we _may_ decide to use the
827 * secondary descriptor, but can't be sure until after we
828 * read the root inode. But before reading the root inode
829 * we may need to change the device blocksize, and would
830 * rather release the old buffer first. So, we cache the
831 * first_data_zone value from the secondary descriptor.
832 */
833 if (joliet_level) {
834 pri = (struct iso_primary_descriptor *) sec;
835 rootp = (struct iso_directory_record *)
836 pri->root_directory_record;
837 first_data_zone = isonum_733(rootp->extent) +
838 isonum_711(rootp->ext_attr_length);
839 }
840
841 /*
842 * We're all done using the volume descriptor, and may need
843 * to change the device blocksize, so release the buffer now.
844 */
845 brelse(pri_bh);
846 brelse(bh);
847
848 /*
849 * Force the blocksize to 512 for 512 byte sectors. The file
850 * read primitives really get it wrong in a bad way if we don't
851 * do this.
852 *
853 * Note - we should never be setting the blocksize to something
854 * less than the hardware sector size for the device. If we
855 * do, we would end up having to read larger buffers and split
856 * out portions to satisfy requests.
857 *
858 * Note2- the idea here is that we want to deal with the optimal
859 * zonesize in the filesystem. If we have it set to something less,
860 * then we have horrible problems with trying to piece together
861 * bits of adjacent blocks in order to properly read directory
862 * entries. By forcing the blocksize in this way, we ensure
863 * that we will never be required to do this.
864 */
865 sb_set_blocksize(s, orig_zonesize);
866
867 sbi->s_nls_iocharset = NULL;
868
869#ifdef CONFIG_JOLIET
870 if (joliet_level && opt.utf8 == 0) {
871 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
872 sbi->s_nls_iocharset = load_nls(p);
873 if (! sbi->s_nls_iocharset) {
874 /* Fail only if explicit charset specified */
875 if (opt.iocharset)
876 goto out_freesbi;
877 sbi->s_nls_iocharset = load_nls_default();
878 }
879 }
880#endif
881 s->s_op = &isofs_sops;
882 s->s_export_op = &isofs_export_ops;
883 sbi->s_mapping = opt.map;
884 sbi->s_rock = (opt.rock ? 2 : 0);
885 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
886 sbi->s_cruft = opt.cruft;
887 sbi->s_hide = opt.hide;
888 sbi->s_showassoc = opt.showassoc;
889 sbi->s_uid = opt.uid;
890 sbi->s_gid = opt.gid;
891 sbi->s_uid_set = opt.uid_set;
892 sbi->s_gid_set = opt.gid_set;
893 sbi->s_utf8 = opt.utf8;
894 sbi->s_nocompress = opt.nocompress;
895 sbi->s_overriderockperm = opt.overriderockperm;
896 /*
897 * It would be incredibly stupid to allow people to mark every file
898 * on the disk as suid, so we merely allow them to set the default
899 * permissions.
900 */
901 if (opt.fmode != ISOFS_INVALID_MODE)
902 sbi->s_fmode = opt.fmode & 0777;
903 else
904 sbi->s_fmode = ISOFS_INVALID_MODE;
905 if (opt.dmode != ISOFS_INVALID_MODE)
906 sbi->s_dmode = opt.dmode & 0777;
907 else
908 sbi->s_dmode = ISOFS_INVALID_MODE;
909
910 /*
911 * Read the root inode, which _may_ result in changing
912 * the s_rock flag. Once we have the final s_rock value,
913 * we then decide whether to use the Joliet descriptor.
914 */
915 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
916 if (IS_ERR(inode))
917 goto out_no_root;
918
919 /*
920 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
921 * correct Joliet root directory.
922 */
923 if (sbi->s_rock == 1 && joliet_level &&
924 rootdir_empty(s, sbi->s_firstdatazone)) {
925 printk(KERN_NOTICE
926 "ISOFS: primary root directory is empty. "
927 "Disabling Rock Ridge and switching to Joliet.");
928 sbi->s_rock = 0;
929 }
930
931 /*
932 * If this disk has both Rock Ridge and Joliet on it, then we
933 * want to use Rock Ridge by default. This can be overridden
934 * by using the norock mount option. There is still one other
935 * possibility that is not taken into account: a Rock Ridge
936 * CD with Unicode names. Until someone sees such a beast, it
937 * will not be supported.
938 */
939 if (sbi->s_rock == 1) {
940 joliet_level = 0;
941 } else if (joliet_level) {
942 sbi->s_rock = 0;
943 if (sbi->s_firstdatazone != first_data_zone) {
944 sbi->s_firstdatazone = first_data_zone;
945 printk(KERN_DEBUG
946 "ISOFS: changing to secondary root\n");
947 iput(inode);
948 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
949 if (IS_ERR(inode))
950 goto out_no_root;
951 }
952 }
953
954 if (opt.check == 'u') {
955 /* Only Joliet is case insensitive by default */
956 if (joliet_level)
957 opt.check = 'r';
958 else
959 opt.check = 's';
960 }
961 sbi->s_joliet_level = joliet_level;
962
963 /* Make sure the root inode is a directory */
964 if (!S_ISDIR(inode->i_mode)) {
965 printk(KERN_WARNING
966 "isofs_fill_super: root inode is not a directory. "
967 "Corrupted media?\n");
968 goto out_iput;
969 }
970
971 table = 0;
972 if (joliet_level)
973 table += 2;
974 if (opt.check == 'r')
975 table++;
976 sbi->s_check = opt.check;
977
978 if (table)
979 s->s_d_op = &isofs_dentry_ops[table - 1];
980
981 /* get the root dentry */
982 s->s_root = d_make_root(inode);
983 if (!(s->s_root)) {
984 error = -ENOMEM;
985 goto out_no_inode;
986 }
987
988 kfree(opt.iocharset);
989
990 return 0;
991
992 /*
993 * Display error messages and free resources.
994 */
995out_iput:
996 iput(inode);
997 goto out_no_inode;
998out_no_root:
999 error = PTR_ERR(inode);
1000 if (error != -ENOMEM)
1001 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
1002out_no_inode:
1003#ifdef CONFIG_JOLIET
1004 unload_nls(sbi->s_nls_iocharset);
1005#endif
1006 goto out_freesbi;
1007out_no_read:
1008 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1009 __func__, s->s_id, iso_blknum, block);
1010 goto out_freebh;
1011out_bad_zone_size:
1012 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1013 sbi->s_log_zone_size);
1014 goto out_freebh;
1015out_bad_size:
1016 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1017 orig_zonesize, opt.blocksize);
1018 goto out_freebh;
1019out_unknown_format:
1020 if (!silent)
1021 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1022
1023out_freebh:
1024 brelse(bh);
1025 brelse(pri_bh);
1026out_freesbi:
1027 kfree(opt.iocharset);
1028 kfree(sbi);
1029 s->s_fs_info = NULL;
1030 return error;
1031}
1032
1033static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1034{
1035 struct super_block *sb = dentry->d_sb;
1036 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1037
1038 buf->f_type = ISOFS_SUPER_MAGIC;
1039 buf->f_bsize = sb->s_blocksize;
1040 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1041 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1042 buf->f_bfree = 0;
1043 buf->f_bavail = 0;
1044 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1045 buf->f_ffree = 0;
1046 buf->f_fsid.val[0] = (u32)id;
1047 buf->f_fsid.val[1] = (u32)(id >> 32);
1048 buf->f_namelen = NAME_MAX;
1049 return 0;
1050}
1051
1052/*
1053 * Get a set of blocks; filling in buffer_heads if already allocated
1054 * or getblk() if they are not. Returns the number of blocks inserted
1055 * (-ve == error.)
1056 */
1057int isofs_get_blocks(struct inode *inode, sector_t iblock,
1058 struct buffer_head **bh, unsigned long nblocks)
1059{
1060 unsigned long b_off = iblock;
1061 unsigned offset, sect_size;
1062 unsigned int firstext;
1063 unsigned long nextblk, nextoff;
1064 int section, rv, error;
1065 struct iso_inode_info *ei = ISOFS_I(inode);
1066
1067 error = -EIO;
1068 rv = 0;
1069 if (iblock != b_off) {
1070 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1071 goto abort;
1072 }
1073
1074
1075 offset = 0;
1076 firstext = ei->i_first_extent;
1077 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1078 nextblk = ei->i_next_section_block;
1079 nextoff = ei->i_next_section_offset;
1080 section = 0;
1081
1082 while (nblocks) {
1083 /* If we are *way* beyond the end of the file, print a message.
1084 * Access beyond the end of the file up to the next page boundary
1085 * is normal, however because of the way the page cache works.
1086 * In this case, we just return 0 so that we can properly fill
1087 * the page with useless information without generating any
1088 * I/O errors.
1089 */
1090 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1091 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1092 __func__, b_off,
1093 (unsigned long long)inode->i_size);
1094 goto abort;
1095 }
1096
1097 /* On the last section, nextblk == 0, section size is likely to
1098 * exceed sect_size by a partial block, and access beyond the
1099 * end of the file will reach beyond the section size, too.
1100 */
1101 while (nextblk && (b_off >= (offset + sect_size))) {
1102 struct inode *ninode;
1103
1104 offset += sect_size;
1105 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1106 if (IS_ERR(ninode)) {
1107 error = PTR_ERR(ninode);
1108 goto abort;
1109 }
1110 firstext = ISOFS_I(ninode)->i_first_extent;
1111 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1112 nextblk = ISOFS_I(ninode)->i_next_section_block;
1113 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1114 iput(ninode);
1115
1116 if (++section > 100) {
1117 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1118 " aborting...\n", __func__);
1119 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1120 "nextblk=%lu nextoff=%lu\n", __func__,
1121 b_off, firstext, (unsigned) sect_size,
1122 nextblk, nextoff);
1123 goto abort;
1124 }
1125 }
1126
1127 if (*bh) {
1128 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1129 } else {
1130 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1131 if (!*bh)
1132 goto abort;
1133 }
1134 bh++; /* Next buffer head */
1135 b_off++; /* Next buffer offset */
1136 nblocks--;
1137 rv++;
1138 }
1139
1140 error = 0;
1141abort:
1142 return rv != 0 ? rv : error;
1143}
1144
1145/*
1146 * Used by the standard interfaces.
1147 */
1148static int isofs_get_block(struct inode *inode, sector_t iblock,
1149 struct buffer_head *bh_result, int create)
1150{
1151 int ret;
1152
1153 if (create) {
1154 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1155 return -EROFS;
1156 }
1157
1158 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1159 return ret < 0 ? ret : 0;
1160}
1161
1162static int isofs_bmap(struct inode *inode, sector_t block)
1163{
1164 struct buffer_head dummy;
1165 int error;
1166
1167 dummy.b_state = 0;
1168 dummy.b_blocknr = -1000;
1169 error = isofs_get_block(inode, block, &dummy, 0);
1170 if (!error)
1171 return dummy.b_blocknr;
1172 return 0;
1173}
1174
1175struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1176{
1177 sector_t blknr = isofs_bmap(inode, block);
1178 if (!blknr)
1179 return NULL;
1180 return sb_bread(inode->i_sb, blknr);
1181}
1182
1183static int isofs_readpage(struct file *file, struct page *page)
1184{
1185 return mpage_readpage(page, isofs_get_block);
1186}
1187
1188static int isofs_readpages(struct file *file, struct address_space *mapping,
1189 struct list_head *pages, unsigned nr_pages)
1190{
1191 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1192}
1193
1194static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1195{
1196 return generic_block_bmap(mapping,block,isofs_get_block);
1197}
1198
1199static const struct address_space_operations isofs_aops = {
1200 .readpage = isofs_readpage,
1201 .readpages = isofs_readpages,
1202 .bmap = _isofs_bmap
1203};
1204
1205static int isofs_read_level3_size(struct inode *inode)
1206{
1207 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1208 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1209 struct buffer_head *bh = NULL;
1210 unsigned long block, offset, block_saved, offset_saved;
1211 int i = 0;
1212 int more_entries = 0;
1213 struct iso_directory_record *tmpde = NULL;
1214 struct iso_inode_info *ei = ISOFS_I(inode);
1215
1216 inode->i_size = 0;
1217
1218 /* The first 16 blocks are reserved as the System Area. Thus,
1219 * no inodes can appear in block 0. We use this to flag that
1220 * this is the last section. */
1221 ei->i_next_section_block = 0;
1222 ei->i_next_section_offset = 0;
1223
1224 block = ei->i_iget5_block;
1225 offset = ei->i_iget5_offset;
1226
1227 do {
1228 struct iso_directory_record *de;
1229 unsigned int de_len;
1230
1231 if (!bh) {
1232 bh = sb_bread(inode->i_sb, block);
1233 if (!bh)
1234 goto out_noread;
1235 }
1236 de = (struct iso_directory_record *) (bh->b_data + offset);
1237 de_len = *(unsigned char *) de;
1238
1239 if (de_len == 0) {
1240 brelse(bh);
1241 bh = NULL;
1242 ++block;
1243 offset = 0;
1244 continue;
1245 }
1246
1247 block_saved = block;
1248 offset_saved = offset;
1249 offset += de_len;
1250
1251 /* Make sure we have a full directory entry */
1252 if (offset >= bufsize) {
1253 int slop = bufsize - offset + de_len;
1254 if (!tmpde) {
1255 tmpde = kmalloc(256, GFP_KERNEL);
1256 if (!tmpde)
1257 goto out_nomem;
1258 }
1259 memcpy(tmpde, de, slop);
1260 offset &= bufsize - 1;
1261 block++;
1262 brelse(bh);
1263 bh = NULL;
1264 if (offset) {
1265 bh = sb_bread(inode->i_sb, block);
1266 if (!bh)
1267 goto out_noread;
1268 memcpy((void *)tmpde+slop, bh->b_data, offset);
1269 }
1270 de = tmpde;
1271 }
1272
1273 inode->i_size += isonum_733(de->size);
1274 if (i == 1) {
1275 ei->i_next_section_block = block_saved;
1276 ei->i_next_section_offset = offset_saved;
1277 }
1278
1279 more_entries = de->flags[-high_sierra] & 0x80;
1280
1281 i++;
1282 if (i > 100)
1283 goto out_toomany;
1284 } while (more_entries);
1285out:
1286 kfree(tmpde);
1287 if (bh)
1288 brelse(bh);
1289 return 0;
1290
1291out_nomem:
1292 if (bh)
1293 brelse(bh);
1294 return -ENOMEM;
1295
1296out_noread:
1297 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1298 kfree(tmpde);
1299 return -EIO;
1300
1301out_toomany:
1302 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1303 "isofs_read_level3_size: inode=%lu\n",
1304 __func__, inode->i_ino);
1305 goto out;
1306}
1307
1308static int isofs_read_inode(struct inode *inode, int relocated)
1309{
1310 struct super_block *sb = inode->i_sb;
1311 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1312 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1313 unsigned long block;
1314 int high_sierra = sbi->s_high_sierra;
1315 struct buffer_head *bh;
1316 struct iso_directory_record *de;
1317 struct iso_directory_record *tmpde = NULL;
1318 unsigned int de_len;
1319 unsigned long offset;
1320 struct iso_inode_info *ei = ISOFS_I(inode);
1321 int ret = -EIO;
1322
1323 block = ei->i_iget5_block;
1324 bh = sb_bread(inode->i_sb, block);
1325 if (!bh)
1326 goto out_badread;
1327
1328 offset = ei->i_iget5_offset;
1329
1330 de = (struct iso_directory_record *) (bh->b_data + offset);
1331 de_len = *(unsigned char *) de;
1332
1333 if (offset + de_len > bufsize) {
1334 int frag1 = bufsize - offset;
1335
1336 tmpde = kmalloc(de_len, GFP_KERNEL);
1337 if (!tmpde) {
1338 ret = -ENOMEM;
1339 goto fail;
1340 }
1341 memcpy(tmpde, bh->b_data + offset, frag1);
1342 brelse(bh);
1343 bh = sb_bread(inode->i_sb, ++block);
1344 if (!bh)
1345 goto out_badread;
1346 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1347 de = tmpde;
1348 }
1349
1350 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1351 ei->i_iget5_offset,
1352 ISOFS_BUFFER_BITS(inode));
1353
1354 /* Assume it is a normal-format file unless told otherwise */
1355 ei->i_file_format = isofs_file_normal;
1356
1357 if (de->flags[-high_sierra] & 2) {
1358 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1359 inode->i_mode = S_IFDIR | sbi->s_dmode;
1360 else
1361 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1362 set_nlink(inode, 1); /*
1363 * Set to 1. We know there are 2, but
1364 * the find utility tries to optimize
1365 * if it is 2, and it screws up. It is
1366 * easier to give 1 which tells find to
1367 * do it the hard way.
1368 */
1369 } else {
1370 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1371 inode->i_mode = S_IFREG | sbi->s_fmode;
1372 } else {
1373 /*
1374 * Set default permissions: r-x for all. The disc
1375 * could be shared with DOS machines so virtually
1376 * anything could be a valid executable.
1377 */
1378 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1379 }
1380 set_nlink(inode, 1);
1381 }
1382 inode->i_uid = sbi->s_uid;
1383 inode->i_gid = sbi->s_gid;
1384 inode->i_blocks = 0;
1385
1386 ei->i_format_parm[0] = 0;
1387 ei->i_format_parm[1] = 0;
1388 ei->i_format_parm[2] = 0;
1389
1390 ei->i_section_size = isonum_733(de->size);
1391 if (de->flags[-high_sierra] & 0x80) {
1392 ret = isofs_read_level3_size(inode);
1393 if (ret < 0)
1394 goto fail;
1395 ret = -EIO;
1396 } else {
1397 ei->i_next_section_block = 0;
1398 ei->i_next_section_offset = 0;
1399 inode->i_size = isonum_733(de->size);
1400 }
1401
1402 /*
1403 * Some dipshit decided to store some other bit of information
1404 * in the high byte of the file length. Truncate size in case
1405 * this CDROM was mounted with the cruft option.
1406 */
1407
1408 if (sbi->s_cruft)
1409 inode->i_size &= 0x00ffffff;
1410
1411 if (de->interleave[0]) {
1412 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1413 inode->i_size = 0;
1414 }
1415
1416 /* I have no idea what file_unit_size is used for, so
1417 we will flag it for now */
1418 if (de->file_unit_size[0] != 0) {
1419 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1420 inode->i_ino);
1421 }
1422
1423 /* I have no idea what other flag bits are used for, so
1424 we will flag it for now */
1425#ifdef DEBUG
1426 if((de->flags[-high_sierra] & ~2)!= 0){
1427 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1428 "(%ld %x).\n",
1429 inode->i_ino, de->flags[-high_sierra]);
1430 }
1431#endif
1432
1433 inode->i_mtime.tv_sec =
1434 inode->i_atime.tv_sec =
1435 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1436 inode->i_mtime.tv_nsec =
1437 inode->i_atime.tv_nsec =
1438 inode->i_ctime.tv_nsec = 0;
1439
1440 ei->i_first_extent = (isonum_733(de->extent) +
1441 isonum_711(de->ext_attr_length));
1442
1443 /* Set the number of blocks for stat() - should be done before RR */
1444 inode->i_blocks = (inode->i_size + 511) >> 9;
1445
1446 /*
1447 * Now test for possible Rock Ridge extensions which will override
1448 * some of these numbers in the inode structure.
1449 */
1450
1451 if (!high_sierra) {
1452 parse_rock_ridge_inode(de, inode, relocated);
1453 /* if we want uid/gid set, override the rock ridge setting */
1454 if (sbi->s_uid_set)
1455 inode->i_uid = sbi->s_uid;
1456 if (sbi->s_gid_set)
1457 inode->i_gid = sbi->s_gid;
1458 }
1459 /* Now set final access rights if overriding rock ridge setting */
1460 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1461 sbi->s_dmode != ISOFS_INVALID_MODE)
1462 inode->i_mode = S_IFDIR | sbi->s_dmode;
1463 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1464 sbi->s_fmode != ISOFS_INVALID_MODE)
1465 inode->i_mode = S_IFREG | sbi->s_fmode;
1466
1467 /* Install the inode operations vector */
1468 if (S_ISREG(inode->i_mode)) {
1469 inode->i_fop = &generic_ro_fops;
1470 switch (ei->i_file_format) {
1471#ifdef CONFIG_ZISOFS
1472 case isofs_file_compressed:
1473 inode->i_data.a_ops = &zisofs_aops;
1474 break;
1475#endif
1476 default:
1477 inode->i_data.a_ops = &isofs_aops;
1478 break;
1479 }
1480 } else if (S_ISDIR(inode->i_mode)) {
1481 inode->i_op = &isofs_dir_inode_operations;
1482 inode->i_fop = &isofs_dir_operations;
1483 } else if (S_ISLNK(inode->i_mode)) {
1484 inode->i_op = &page_symlink_inode_operations;
1485 inode_nohighmem(inode);
1486 inode->i_data.a_ops = &isofs_symlink_aops;
1487 } else
1488 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1489 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1490
1491 ret = 0;
1492out:
1493 kfree(tmpde);
1494 if (bh)
1495 brelse(bh);
1496 return ret;
1497
1498out_badread:
1499 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1500fail:
1501 goto out;
1502}
1503
1504struct isofs_iget5_callback_data {
1505 unsigned long block;
1506 unsigned long offset;
1507};
1508
1509static int isofs_iget5_test(struct inode *ino, void *data)
1510{
1511 struct iso_inode_info *i = ISOFS_I(ino);
1512 struct isofs_iget5_callback_data *d =
1513 (struct isofs_iget5_callback_data*)data;
1514 return (i->i_iget5_block == d->block)
1515 && (i->i_iget5_offset == d->offset);
1516}
1517
1518static int isofs_iget5_set(struct inode *ino, void *data)
1519{
1520 struct iso_inode_info *i = ISOFS_I(ino);
1521 struct isofs_iget5_callback_data *d =
1522 (struct isofs_iget5_callback_data*)data;
1523 i->i_iget5_block = d->block;
1524 i->i_iget5_offset = d->offset;
1525 return 0;
1526}
1527
1528/* Store, in the inode's containing structure, the block and block
1529 * offset that point to the underlying meta-data for the inode. The
1530 * code below is otherwise similar to the iget() code in
1531 * include/linux/fs.h */
1532struct inode *__isofs_iget(struct super_block *sb,
1533 unsigned long block,
1534 unsigned long offset,
1535 int relocated)
1536{
1537 unsigned long hashval;
1538 struct inode *inode;
1539 struct isofs_iget5_callback_data data;
1540 long ret;
1541
1542 if (offset >= 1ul << sb->s_blocksize_bits)
1543 return ERR_PTR(-EINVAL);
1544
1545 data.block = block;
1546 data.offset = offset;
1547
1548 hashval = (block << sb->s_blocksize_bits) | offset;
1549
1550 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1551 &isofs_iget5_set, &data);
1552
1553 if (!inode)
1554 return ERR_PTR(-ENOMEM);
1555
1556 if (inode->i_state & I_NEW) {
1557 ret = isofs_read_inode(inode, relocated);
1558 if (ret < 0) {
1559 iget_failed(inode);
1560 inode = ERR_PTR(ret);
1561 } else {
1562 unlock_new_inode(inode);
1563 }
1564 }
1565
1566 return inode;
1567}
1568
1569static struct dentry *isofs_mount(struct file_system_type *fs_type,
1570 int flags, const char *dev_name, void *data)
1571{
1572 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1573}
1574
1575static struct file_system_type iso9660_fs_type = {
1576 .owner = THIS_MODULE,
1577 .name = "iso9660",
1578 .mount = isofs_mount,
1579 .kill_sb = kill_block_super,
1580 .fs_flags = FS_REQUIRES_DEV,
1581};
1582MODULE_ALIAS_FS("iso9660");
1583MODULE_ALIAS("iso9660");
1584
1585static int __init init_iso9660_fs(void)
1586{
1587 int err = init_inodecache();
1588 if (err)
1589 goto out;
1590#ifdef CONFIG_ZISOFS
1591 err = zisofs_init();
1592 if (err)
1593 goto out1;
1594#endif
1595 err = register_filesystem(&iso9660_fs_type);
1596 if (err)
1597 goto out2;
1598 return 0;
1599out2:
1600#ifdef CONFIG_ZISOFS
1601 zisofs_cleanup();
1602out1:
1603#endif
1604 destroy_inodecache();
1605out:
1606 return err;
1607}
1608
1609static void __exit exit_iso9660_fs(void)
1610{
1611 unregister_filesystem(&iso9660_fs_type);
1612#ifdef CONFIG_ZISOFS
1613 zisofs_cleanup();
1614#endif
1615 destroy_inodecache();
1616}
1617
1618module_init(init_iso9660_fs)
1619module_exit(exit_iso9660_fs)
1620MODULE_LICENSE("GPL");