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