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1/*
2 * linux/fs/isofs/inode.c
3 *
4 * (C) 1991 Linus Torvalds - minix filesystem
5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
6 * 1994 Eberhard Mönkeberg - multi session handling.
7 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
8 * 1997 Gordon Chaffee - Joliet CDs
9 * 1998 Eric Lammerts - ISO 9660 Level 3
10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
11 * 2004 Paul Serice - NFS Export Operations
12 */
13
14#include <linux/init.h>
15#include <linux/module.h>
16
17#include <linux/slab.h>
18#include <linux/nls.h>
19#include <linux/ctype.h>
20#include <linux/statfs.h>
21#include <linux/cdrom.h>
22#include <linux/parser.h>
23#include <linux/mpage.h>
24#include <linux/user_namespace.h>
25
26#include "isofs.h"
27#include "zisofs.h"
28
29#define BEQUIET
30
31static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
32static int isofs_hash(const struct dentry *parent, struct qstr *qstr);
33static int isofs_dentry_cmpi(const struct dentry *parent,
34 const struct dentry *dentry,
35 unsigned int len, const char *str, const struct qstr *name);
36static int isofs_dentry_cmp(const struct dentry *parent,
37 const struct dentry *dentry,
38 unsigned int len, const char *str, const struct qstr *name);
39
40#ifdef CONFIG_JOLIET
41static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
42static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
43static int isofs_dentry_cmpi_ms(const struct dentry *parent,
44 const struct dentry *dentry,
45 unsigned int len, const char *str, const struct qstr *name);
46static int isofs_dentry_cmp_ms(const struct dentry *parent,
47 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 *);
65static int isofs_statfs (struct dentry *, struct kstatfs *);
66
67static struct kmem_cache *isofs_inode_cachep;
68
69static struct inode *isofs_alloc_inode(struct super_block *sb)
70{
71 struct iso_inode_info *ei;
72 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
73 if (!ei)
74 return NULL;
75 return &ei->vfs_inode;
76}
77
78static void isofs_i_callback(struct rcu_head *head)
79{
80 struct inode *inode = container_of(head, struct inode, i_rcu);
81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
82}
83
84static void isofs_destroy_inode(struct inode *inode)
85{
86 call_rcu(&inode->i_rcu, isofs_i_callback);
87}
88
89static void init_once(void *foo)
90{
91 struct iso_inode_info *ei = foo;
92
93 inode_init_once(&ei->vfs_inode);
94}
95
96static int __init init_inodecache(void)
97{
98 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
99 sizeof(struct iso_inode_info),
100 0, (SLAB_RECLAIM_ACCOUNT|
101 SLAB_MEM_SPREAD),
102 init_once);
103 if (isofs_inode_cachep == NULL)
104 return -ENOMEM;
105 return 0;
106}
107
108static void destroy_inodecache(void)
109{
110 /*
111 * Make sure all delayed rcu free inodes are flushed before we
112 * destroy cache.
113 */
114 rcu_barrier();
115 kmem_cache_destroy(isofs_inode_cachep);
116}
117
118static int isofs_remount(struct super_block *sb, int *flags, char *data)
119{
120 sync_filesystem(sb);
121 if (!(*flags & MS_RDONLY))
122 return -EROFS;
123 return 0;
124}
125
126static const struct super_operations isofs_sops = {
127 .alloc_inode = isofs_alloc_inode,
128 .destroy_inode = isofs_destroy_inode,
129 .put_super = isofs_put_super,
130 .statfs = isofs_statfs,
131 .remount_fs = isofs_remount,
132 .show_options = generic_show_options,
133};
134
135
136static const struct dentry_operations isofs_dentry_ops[] = {
137 {
138 .d_hash = isofs_hash,
139 .d_compare = isofs_dentry_cmp,
140 },
141 {
142 .d_hash = isofs_hashi,
143 .d_compare = isofs_dentry_cmpi,
144 },
145#ifdef CONFIG_JOLIET
146 {
147 .d_hash = isofs_hash_ms,
148 .d_compare = isofs_dentry_cmp_ms,
149 },
150 {
151 .d_hash = isofs_hashi_ms,
152 .d_compare = isofs_dentry_cmpi_ms,
153 },
154#endif
155};
156
157struct iso9660_options{
158 unsigned int rock:1;
159 unsigned int joliet:1;
160 unsigned int cruft:1;
161 unsigned int hide:1;
162 unsigned int showassoc:1;
163 unsigned int nocompress:1;
164 unsigned int overriderockperm:1;
165 unsigned int uid_set:1;
166 unsigned int gid_set:1;
167 unsigned int utf8:1;
168 unsigned char map;
169 unsigned char check;
170 unsigned int blocksize;
171 umode_t fmode;
172 umode_t dmode;
173 kgid_t gid;
174 kuid_t uid;
175 char *iocharset;
176 /* LVE */
177 s32 session;
178 s32 sbsector;
179};
180
181/*
182 * Compute the hash for the isofs name corresponding to the dentry.
183 */
184static int
185isofs_hash_common(struct qstr *qstr, int ms)
186{
187 const char *name;
188 int len;
189
190 len = qstr->len;
191 name = qstr->name;
192 if (ms) {
193 while (len && name[len-1] == '.')
194 len--;
195 }
196
197 qstr->hash = full_name_hash(name, len);
198
199 return 0;
200}
201
202/*
203 * Compute the hash for the isofs name corresponding to the dentry.
204 */
205static int
206isofs_hashi_common(struct qstr *qstr, int ms)
207{
208 const char *name;
209 int len;
210 char c;
211 unsigned long hash;
212
213 len = qstr->len;
214 name = qstr->name;
215 if (ms) {
216 while (len && name[len-1] == '.')
217 len--;
218 }
219
220 hash = init_name_hash();
221 while (len--) {
222 c = tolower(*name++);
223 hash = partial_name_hash(c, hash);
224 }
225 qstr->hash = end_name_hash(hash);
226
227 return 0;
228}
229
230/*
231 * Compare of two isofs names.
232 */
233static int isofs_dentry_cmp_common(
234 unsigned int len, const char *str,
235 const struct qstr *name, int ms, int ci)
236{
237 int alen, blen;
238
239 /* A filename cannot end in '.' or we treat it like it has none */
240 alen = name->len;
241 blen = len;
242 if (ms) {
243 while (alen && name->name[alen-1] == '.')
244 alen--;
245 while (blen && str[blen-1] == '.')
246 blen--;
247 }
248 if (alen == blen) {
249 if (ci) {
250 if (strnicmp(name->name, str, alen) == 0)
251 return 0;
252 } else {
253 if (strncmp(name->name, str, alen) == 0)
254 return 0;
255 }
256 }
257 return 1;
258}
259
260static int
261isofs_hash(const struct dentry *dentry, struct qstr *qstr)
262{
263 return isofs_hash_common(qstr, 0);
264}
265
266static int
267isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
268{
269 return isofs_hashi_common(qstr, 0);
270}
271
272static int
273isofs_dentry_cmp(const struct dentry *parent, const struct dentry *dentry,
274 unsigned int len, const char *str, const struct qstr *name)
275{
276 return isofs_dentry_cmp_common(len, str, name, 0, 0);
277}
278
279static int
280isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry,
281 unsigned int len, const char *str, const struct qstr *name)
282{
283 return isofs_dentry_cmp_common(len, str, name, 0, 1);
284}
285
286#ifdef CONFIG_JOLIET
287static int
288isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
289{
290 return isofs_hash_common(qstr, 1);
291}
292
293static int
294isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
295{
296 return isofs_hashi_common(qstr, 1);
297}
298
299static int
300isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry,
301 unsigned int len, const char *str, const struct qstr *name)
302{
303 return isofs_dentry_cmp_common(len, str, name, 1, 0);
304}
305
306static int
307isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
308 unsigned int len, const char *str, const struct qstr *name)
309{
310 return isofs_dentry_cmp_common(len, str, name, 1, 1);
311}
312#endif
313
314enum {
315 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
316 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
317 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
318 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
319};
320
321static const match_table_t tokens = {
322 {Opt_norock, "norock"},
323 {Opt_nojoliet, "nojoliet"},
324 {Opt_unhide, "unhide"},
325 {Opt_hide, "hide"},
326 {Opt_showassoc, "showassoc"},
327 {Opt_cruft, "cruft"},
328 {Opt_utf8, "utf8"},
329 {Opt_iocharset, "iocharset=%s"},
330 {Opt_map_a, "map=acorn"},
331 {Opt_map_a, "map=a"},
332 {Opt_map_n, "map=normal"},
333 {Opt_map_n, "map=n"},
334 {Opt_map_o, "map=off"},
335 {Opt_map_o, "map=o"},
336 {Opt_session, "session=%u"},
337 {Opt_sb, "sbsector=%u"},
338 {Opt_check_r, "check=relaxed"},
339 {Opt_check_r, "check=r"},
340 {Opt_check_s, "check=strict"},
341 {Opt_check_s, "check=s"},
342 {Opt_uid, "uid=%u"},
343 {Opt_gid, "gid=%u"},
344 {Opt_mode, "mode=%u"},
345 {Opt_dmode, "dmode=%u"},
346 {Opt_overriderockperm, "overriderockperm"},
347 {Opt_block, "block=%u"},
348 {Opt_ignore, "conv=binary"},
349 {Opt_ignore, "conv=b"},
350 {Opt_ignore, "conv=text"},
351 {Opt_ignore, "conv=t"},
352 {Opt_ignore, "conv=mtext"},
353 {Opt_ignore, "conv=m"},
354 {Opt_ignore, "conv=auto"},
355 {Opt_ignore, "conv=a"},
356 {Opt_nocompress, "nocompress"},
357 {Opt_err, NULL}
358};
359
360static int parse_options(char *options, struct iso9660_options *popt)
361{
362 char *p;
363 int option;
364
365 popt->map = 'n';
366 popt->rock = 1;
367 popt->joliet = 1;
368 popt->cruft = 0;
369 popt->hide = 0;
370 popt->showassoc = 0;
371 popt->check = 'u'; /* unset */
372 popt->nocompress = 0;
373 popt->blocksize = 1024;
374 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
375 popt->uid_set = 0;
376 popt->gid_set = 0;
377 popt->gid = GLOBAL_ROOT_GID;
378 popt->uid = GLOBAL_ROOT_UID;
379 popt->iocharset = NULL;
380 popt->utf8 = 0;
381 popt->overriderockperm = 0;
382 popt->session=-1;
383 popt->sbsector=-1;
384 if (!options)
385 return 1;
386
387 while ((p = strsep(&options, ",")) != NULL) {
388 int token;
389 substring_t args[MAX_OPT_ARGS];
390 unsigned n;
391
392 if (!*p)
393 continue;
394
395 token = match_token(p, tokens, args);
396 switch (token) {
397 case Opt_norock:
398 popt->rock = 0;
399 break;
400 case Opt_nojoliet:
401 popt->joliet = 0;
402 break;
403 case Opt_hide:
404 popt->hide = 1;
405 break;
406 case Opt_unhide:
407 case Opt_showassoc:
408 popt->showassoc = 1;
409 break;
410 case Opt_cruft:
411 popt->cruft = 1;
412 break;
413 case Opt_utf8:
414 popt->utf8 = 1;
415 break;
416#ifdef CONFIG_JOLIET
417 case Opt_iocharset:
418 popt->iocharset = match_strdup(&args[0]);
419 break;
420#endif
421 case Opt_map_a:
422 popt->map = 'a';
423 break;
424 case Opt_map_o:
425 popt->map = 'o';
426 break;
427 case Opt_map_n:
428 popt->map = 'n';
429 break;
430 case Opt_session:
431 if (match_int(&args[0], &option))
432 return 0;
433 n = option;
434 if (n > 99)
435 return 0;
436 popt->session = n + 1;
437 break;
438 case Opt_sb:
439 if (match_int(&args[0], &option))
440 return 0;
441 popt->sbsector = option;
442 break;
443 case Opt_check_r:
444 popt->check = 'r';
445 break;
446 case Opt_check_s:
447 popt->check = 's';
448 break;
449 case Opt_ignore:
450 break;
451 case Opt_uid:
452 if (match_int(&args[0], &option))
453 return 0;
454 popt->uid = make_kuid(current_user_ns(), option);
455 if (!uid_valid(popt->uid))
456 return 0;
457 popt->uid_set = 1;
458 break;
459 case Opt_gid:
460 if (match_int(&args[0], &option))
461 return 0;
462 popt->gid = make_kgid(current_user_ns(), option);
463 if (!gid_valid(popt->gid))
464 return 0;
465 popt->gid_set = 1;
466 break;
467 case Opt_mode:
468 if (match_int(&args[0], &option))
469 return 0;
470 popt->fmode = option;
471 break;
472 case Opt_dmode:
473 if (match_int(&args[0], &option))
474 return 0;
475 popt->dmode = option;
476 break;
477 case Opt_overriderockperm:
478 popt->overriderockperm = 1;
479 break;
480 case Opt_block:
481 if (match_int(&args[0], &option))
482 return 0;
483 n = option;
484 if (n != 512 && n != 1024 && n != 2048)
485 return 0;
486 popt->blocksize = n;
487 break;
488 case Opt_nocompress:
489 popt->nocompress = 1;
490 break;
491 default:
492 return 0;
493 }
494 }
495 return 1;
496}
497
498/*
499 * look if the driver can tell the multi session redirection value
500 *
501 * don't change this if you don't know what you do, please!
502 * Multisession is legal only with XA disks.
503 * A non-XA disk with more than one volume descriptor may do it right, but
504 * usually is written in a nowhere standardized "multi-partition" manner.
505 * Multisession uses absolute addressing (solely the first frame of the whole
506 * track is #0), multi-partition uses relative addressing (each first frame of
507 * each track is #0), and a track is not a session.
508 *
509 * A broken CDwriter software or drive firmware does not set new standards,
510 * at least not if conflicting with the existing ones.
511 *
512 * emoenke@gwdg.de
513 */
514#define WE_OBEY_THE_WRITTEN_STANDARDS 1
515
516static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
517{
518 struct cdrom_multisession ms_info;
519 unsigned int vol_desc_start;
520 struct block_device *bdev = sb->s_bdev;
521 int i;
522
523 vol_desc_start=0;
524 ms_info.addr_format=CDROM_LBA;
525 if(session >= 0 && session <= 99) {
526 struct cdrom_tocentry Te;
527 Te.cdte_track=session;
528 Te.cdte_format=CDROM_LBA;
529 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
530 if (!i) {
531 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
532 session, Te.cdte_addr.lba,
533 Te.cdte_ctrl&CDROM_DATA_TRACK);
534 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
535 return Te.cdte_addr.lba;
536 }
537
538 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
539 }
540 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
541 if (session > 0)
542 printk(KERN_ERR "ISOFS: Invalid session number\n");
543#if 0
544 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
545 if (i==0) {
546 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
547 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
548 }
549#endif
550 if (i==0)
551#if WE_OBEY_THE_WRITTEN_STANDARDS
552 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
553#endif
554 vol_desc_start=ms_info.addr.lba;
555 return vol_desc_start;
556}
557
558/*
559 * Check if root directory is empty (has less than 3 files).
560 *
561 * Used to detect broken CDs where ISO root directory is empty but Joliet root
562 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
563 * (and Joliet used instead) or else no files would be visible.
564 */
565static bool rootdir_empty(struct super_block *sb, unsigned long block)
566{
567 int offset = 0, files = 0, de_len;
568 struct iso_directory_record *de;
569 struct buffer_head *bh;
570
571 bh = sb_bread(sb, block);
572 if (!bh)
573 return true;
574 while (files < 3) {
575 de = (struct iso_directory_record *) (bh->b_data + offset);
576 de_len = *(unsigned char *) de;
577 if (de_len == 0)
578 break;
579 files++;
580 offset += de_len;
581 }
582 brelse(bh);
583 return files < 3;
584}
585
586/*
587 * Initialize the superblock and read the root inode.
588 *
589 * Note: a check_disk_change() has been done immediately prior
590 * to this call, so we don't need to check again.
591 */
592static int isofs_fill_super(struct super_block *s, void *data, int silent)
593{
594 struct buffer_head *bh = NULL, *pri_bh = NULL;
595 struct hs_primary_descriptor *h_pri = NULL;
596 struct iso_primary_descriptor *pri = NULL;
597 struct iso_supplementary_descriptor *sec = NULL;
598 struct iso_directory_record *rootp;
599 struct inode *inode;
600 struct iso9660_options opt;
601 struct isofs_sb_info *sbi;
602 unsigned long first_data_zone;
603 int joliet_level = 0;
604 int iso_blknum, block;
605 int orig_zonesize;
606 int table, error = -EINVAL;
607 unsigned int vol_desc_start;
608
609 save_mount_options(s, data);
610
611 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
612 if (!sbi)
613 return -ENOMEM;
614 s->s_fs_info = sbi;
615
616 if (!parse_options((char *)data, &opt))
617 goto out_freesbi;
618
619 /*
620 * First of all, get the hardware blocksize for this device.
621 * If we don't know what it is, or the hardware blocksize is
622 * larger than the blocksize the user specified, then use
623 * that value.
624 */
625 /*
626 * What if bugger tells us to go beyond page size?
627 */
628 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
629
630 sbi->s_high_sierra = 0; /* default is iso9660 */
631
632 vol_desc_start = (opt.sbsector != -1) ?
633 opt.sbsector : isofs_get_last_session(s,opt.session);
634
635 for (iso_blknum = vol_desc_start+16;
636 iso_blknum < vol_desc_start+100; iso_blknum++) {
637 struct hs_volume_descriptor *hdp;
638 struct iso_volume_descriptor *vdp;
639
640 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
641 if (!(bh = sb_bread(s, block)))
642 goto out_no_read;
643
644 vdp = (struct iso_volume_descriptor *)bh->b_data;
645 hdp = (struct hs_volume_descriptor *)bh->b_data;
646
647 /*
648 * Due to the overlapping physical location of the descriptors,
649 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
650 * proper identification in this case, we first check for ISO.
651 */
652 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
653 if (isonum_711(vdp->type) == ISO_VD_END)
654 break;
655 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
656 if (pri == NULL) {
657 pri = (struct iso_primary_descriptor *)vdp;
658 /* Save the buffer in case we need it ... */
659 pri_bh = bh;
660 bh = NULL;
661 }
662 }
663#ifdef CONFIG_JOLIET
664 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
665 sec = (struct iso_supplementary_descriptor *)vdp;
666 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
667 if (opt.joliet) {
668 if (sec->escape[2] == 0x40)
669 joliet_level = 1;
670 else if (sec->escape[2] == 0x43)
671 joliet_level = 2;
672 else if (sec->escape[2] == 0x45)
673 joliet_level = 3;
674
675 printk(KERN_DEBUG "ISO 9660 Extensions: "
676 "Microsoft Joliet Level %d\n",
677 joliet_level);
678 }
679 goto root_found;
680 } else {
681 /* Unknown supplementary volume descriptor */
682 sec = NULL;
683 }
684 }
685#endif
686 } else {
687 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
688 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
689 goto out_freebh;
690
691 sbi->s_high_sierra = 1;
692 opt.rock = 0;
693 h_pri = (struct hs_primary_descriptor *)vdp;
694 goto root_found;
695 }
696 }
697
698 /* Just skip any volume descriptors we don't recognize */
699
700 brelse(bh);
701 bh = NULL;
702 }
703 /*
704 * If we fall through, either no volume descriptor was found,
705 * or else we passed a primary descriptor looking for others.
706 */
707 if (!pri)
708 goto out_unknown_format;
709 brelse(bh);
710 bh = pri_bh;
711 pri_bh = NULL;
712
713root_found:
714
715 if (joliet_level && (pri == NULL || !opt.rock)) {
716 /* This is the case of Joliet with the norock mount flag.
717 * A disc with both Joliet and Rock Ridge is handled later
718 */
719 pri = (struct iso_primary_descriptor *) sec;
720 }
721
722 if(sbi->s_high_sierra){
723 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
724 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
725 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
726 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
727 } else {
728 if (!pri)
729 goto out_freebh;
730 rootp = (struct iso_directory_record *) pri->root_directory_record;
731 sbi->s_nzones = isonum_733(pri->volume_space_size);
732 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
733 sbi->s_max_size = isonum_733(pri->volume_space_size);
734 }
735
736 sbi->s_ninodes = 0; /* No way to figure this out easily */
737
738 orig_zonesize = sbi->s_log_zone_size;
739 /*
740 * If the zone size is smaller than the hardware sector size,
741 * this is a fatal error. This would occur if the disc drive
742 * had sectors that were 2048 bytes, but the filesystem had
743 * blocks that were 512 bytes (which should only very rarely
744 * happen.)
745 */
746 if (orig_zonesize < opt.blocksize)
747 goto out_bad_size;
748
749 /* RDE: convert log zone size to bit shift */
750 switch (sbi->s_log_zone_size) {
751 case 512: sbi->s_log_zone_size = 9; break;
752 case 1024: sbi->s_log_zone_size = 10; break;
753 case 2048: sbi->s_log_zone_size = 11; break;
754
755 default:
756 goto out_bad_zone_size;
757 }
758
759 s->s_magic = ISOFS_SUPER_MAGIC;
760
761 /*
762 * With multi-extent files, file size is only limited by the maximum
763 * size of a file system, which is 8 TB.
764 */
765 s->s_maxbytes = 0x80000000000LL;
766
767 /* Set this for reference. Its not currently used except on write
768 which we don't have .. */
769
770 first_data_zone = isonum_733(rootp->extent) +
771 isonum_711(rootp->ext_attr_length);
772 sbi->s_firstdatazone = first_data_zone;
773#ifndef BEQUIET
774 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
775 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
776 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
777 if(sbi->s_high_sierra)
778 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
779#endif
780
781 /*
782 * If the Joliet level is set, we _may_ decide to use the
783 * secondary descriptor, but can't be sure until after we
784 * read the root inode. But before reading the root inode
785 * we may need to change the device blocksize, and would
786 * rather release the old buffer first. So, we cache the
787 * first_data_zone value from the secondary descriptor.
788 */
789 if (joliet_level) {
790 pri = (struct iso_primary_descriptor *) sec;
791 rootp = (struct iso_directory_record *)
792 pri->root_directory_record;
793 first_data_zone = isonum_733(rootp->extent) +
794 isonum_711(rootp->ext_attr_length);
795 }
796
797 /*
798 * We're all done using the volume descriptor, and may need
799 * to change the device blocksize, so release the buffer now.
800 */
801 brelse(pri_bh);
802 brelse(bh);
803
804 /*
805 * Force the blocksize to 512 for 512 byte sectors. The file
806 * read primitives really get it wrong in a bad way if we don't
807 * do this.
808 *
809 * Note - we should never be setting the blocksize to something
810 * less than the hardware sector size for the device. If we
811 * do, we would end up having to read larger buffers and split
812 * out portions to satisfy requests.
813 *
814 * Note2- the idea here is that we want to deal with the optimal
815 * zonesize in the filesystem. If we have it set to something less,
816 * then we have horrible problems with trying to piece together
817 * bits of adjacent blocks in order to properly read directory
818 * entries. By forcing the blocksize in this way, we ensure
819 * that we will never be required to do this.
820 */
821 sb_set_blocksize(s, orig_zonesize);
822
823 sbi->s_nls_iocharset = NULL;
824
825#ifdef CONFIG_JOLIET
826 if (joliet_level && opt.utf8 == 0) {
827 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
828 sbi->s_nls_iocharset = load_nls(p);
829 if (! sbi->s_nls_iocharset) {
830 /* Fail only if explicit charset specified */
831 if (opt.iocharset)
832 goto out_freesbi;
833 sbi->s_nls_iocharset = load_nls_default();
834 }
835 }
836#endif
837 s->s_op = &isofs_sops;
838 s->s_export_op = &isofs_export_ops;
839 sbi->s_mapping = opt.map;
840 sbi->s_rock = (opt.rock ? 2 : 0);
841 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
842 sbi->s_cruft = opt.cruft;
843 sbi->s_hide = opt.hide;
844 sbi->s_showassoc = opt.showassoc;
845 sbi->s_uid = opt.uid;
846 sbi->s_gid = opt.gid;
847 sbi->s_uid_set = opt.uid_set;
848 sbi->s_gid_set = opt.gid_set;
849 sbi->s_utf8 = opt.utf8;
850 sbi->s_nocompress = opt.nocompress;
851 sbi->s_overriderockperm = opt.overriderockperm;
852 /*
853 * It would be incredibly stupid to allow people to mark every file
854 * on the disk as suid, so we merely allow them to set the default
855 * permissions.
856 */
857 if (opt.fmode != ISOFS_INVALID_MODE)
858 sbi->s_fmode = opt.fmode & 0777;
859 else
860 sbi->s_fmode = ISOFS_INVALID_MODE;
861 if (opt.dmode != ISOFS_INVALID_MODE)
862 sbi->s_dmode = opt.dmode & 0777;
863 else
864 sbi->s_dmode = ISOFS_INVALID_MODE;
865
866 /*
867 * Read the root inode, which _may_ result in changing
868 * the s_rock flag. Once we have the final s_rock value,
869 * we then decide whether to use the Joliet descriptor.
870 */
871 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
872 if (IS_ERR(inode))
873 goto out_no_root;
874
875 /*
876 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
877 * correct Joliet root directory.
878 */
879 if (sbi->s_rock == 1 && joliet_level &&
880 rootdir_empty(s, sbi->s_firstdatazone)) {
881 printk(KERN_NOTICE
882 "ISOFS: primary root directory is empty. "
883 "Disabling Rock Ridge and switching to Joliet.");
884 sbi->s_rock = 0;
885 }
886
887 /*
888 * If this disk has both Rock Ridge and Joliet on it, then we
889 * want to use Rock Ridge by default. This can be overridden
890 * by using the norock mount option. There is still one other
891 * possibility that is not taken into account: a Rock Ridge
892 * CD with Unicode names. Until someone sees such a beast, it
893 * will not be supported.
894 */
895 if (sbi->s_rock == 1) {
896 joliet_level = 0;
897 } else if (joliet_level) {
898 sbi->s_rock = 0;
899 if (sbi->s_firstdatazone != first_data_zone) {
900 sbi->s_firstdatazone = first_data_zone;
901 printk(KERN_DEBUG
902 "ISOFS: changing to secondary root\n");
903 iput(inode);
904 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
905 if (IS_ERR(inode))
906 goto out_no_root;
907 }
908 }
909
910 if (opt.check == 'u') {
911 /* Only Joliet is case insensitive by default */
912 if (joliet_level)
913 opt.check = 'r';
914 else
915 opt.check = 's';
916 }
917 sbi->s_joliet_level = joliet_level;
918
919 /* Make sure the root inode is a directory */
920 if (!S_ISDIR(inode->i_mode)) {
921 printk(KERN_WARNING
922 "isofs_fill_super: root inode is not a directory. "
923 "Corrupted media?\n");
924 goto out_iput;
925 }
926
927 table = 0;
928 if (joliet_level)
929 table += 2;
930 if (opt.check == 'r')
931 table++;
932
933 s->s_d_op = &isofs_dentry_ops[table];
934
935 /* get the root dentry */
936 s->s_root = d_make_root(inode);
937 if (!(s->s_root)) {
938 error = -ENOMEM;
939 goto out_no_inode;
940 }
941
942 kfree(opt.iocharset);
943
944 return 0;
945
946 /*
947 * Display error messages and free resources.
948 */
949out_iput:
950 iput(inode);
951 goto out_no_inode;
952out_no_root:
953 error = PTR_ERR(inode);
954 if (error != -ENOMEM)
955 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
956out_no_inode:
957#ifdef CONFIG_JOLIET
958 unload_nls(sbi->s_nls_iocharset);
959#endif
960 goto out_freesbi;
961out_no_read:
962 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
963 __func__, s->s_id, iso_blknum, block);
964 goto out_freebh;
965out_bad_zone_size:
966 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
967 sbi->s_log_zone_size);
968 goto out_freebh;
969out_bad_size:
970 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
971 orig_zonesize, opt.blocksize);
972 goto out_freebh;
973out_unknown_format:
974 if (!silent)
975 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
976
977out_freebh:
978 brelse(bh);
979 brelse(pri_bh);
980out_freesbi:
981 kfree(opt.iocharset);
982 kfree(sbi);
983 s->s_fs_info = NULL;
984 return error;
985}
986
987static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
988{
989 struct super_block *sb = dentry->d_sb;
990 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
991
992 buf->f_type = ISOFS_SUPER_MAGIC;
993 buf->f_bsize = sb->s_blocksize;
994 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
995 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
996 buf->f_bfree = 0;
997 buf->f_bavail = 0;
998 buf->f_files = ISOFS_SB(sb)->s_ninodes;
999 buf->f_ffree = 0;
1000 buf->f_fsid.val[0] = (u32)id;
1001 buf->f_fsid.val[1] = (u32)(id >> 32);
1002 buf->f_namelen = NAME_MAX;
1003 return 0;
1004}
1005
1006/*
1007 * Get a set of blocks; filling in buffer_heads if already allocated
1008 * or getblk() if they are not. Returns the number of blocks inserted
1009 * (-ve == error.)
1010 */
1011int isofs_get_blocks(struct inode *inode, sector_t iblock,
1012 struct buffer_head **bh, unsigned long nblocks)
1013{
1014 unsigned long b_off = iblock;
1015 unsigned offset, sect_size;
1016 unsigned int firstext;
1017 unsigned long nextblk, nextoff;
1018 int section, rv, error;
1019 struct iso_inode_info *ei = ISOFS_I(inode);
1020
1021 error = -EIO;
1022 rv = 0;
1023 if (iblock != b_off) {
1024 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1025 goto abort;
1026 }
1027
1028
1029 offset = 0;
1030 firstext = ei->i_first_extent;
1031 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1032 nextblk = ei->i_next_section_block;
1033 nextoff = ei->i_next_section_offset;
1034 section = 0;
1035
1036 while (nblocks) {
1037 /* If we are *way* beyond the end of the file, print a message.
1038 * Access beyond the end of the file up to the next page boundary
1039 * is normal, however because of the way the page cache works.
1040 * In this case, we just return 0 so that we can properly fill
1041 * the page with useless information without generating any
1042 * I/O errors.
1043 */
1044 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1045 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1046 __func__, b_off,
1047 (unsigned long long)inode->i_size);
1048 goto abort;
1049 }
1050
1051 /* On the last section, nextblk == 0, section size is likely to
1052 * exceed sect_size by a partial block, and access beyond the
1053 * end of the file will reach beyond the section size, too.
1054 */
1055 while (nextblk && (b_off >= (offset + sect_size))) {
1056 struct inode *ninode;
1057
1058 offset += sect_size;
1059 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1060 if (IS_ERR(ninode)) {
1061 error = PTR_ERR(ninode);
1062 goto abort;
1063 }
1064 firstext = ISOFS_I(ninode)->i_first_extent;
1065 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1066 nextblk = ISOFS_I(ninode)->i_next_section_block;
1067 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1068 iput(ninode);
1069
1070 if (++section > 100) {
1071 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1072 " aborting...\n", __func__);
1073 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1074 "nextblk=%lu nextoff=%lu\n", __func__,
1075 b_off, firstext, (unsigned) sect_size,
1076 nextblk, nextoff);
1077 goto abort;
1078 }
1079 }
1080
1081 if (*bh) {
1082 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1083 } else {
1084 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1085 if (!*bh)
1086 goto abort;
1087 }
1088 bh++; /* Next buffer head */
1089 b_off++; /* Next buffer offset */
1090 nblocks--;
1091 rv++;
1092 }
1093
1094 error = 0;
1095abort:
1096 return rv != 0 ? rv : error;
1097}
1098
1099/*
1100 * Used by the standard interfaces.
1101 */
1102static int isofs_get_block(struct inode *inode, sector_t iblock,
1103 struct buffer_head *bh_result, int create)
1104{
1105 int ret;
1106
1107 if (create) {
1108 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1109 return -EROFS;
1110 }
1111
1112 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1113 return ret < 0 ? ret : 0;
1114}
1115
1116static int isofs_bmap(struct inode *inode, sector_t block)
1117{
1118 struct buffer_head dummy;
1119 int error;
1120
1121 dummy.b_state = 0;
1122 dummy.b_blocknr = -1000;
1123 error = isofs_get_block(inode, block, &dummy, 0);
1124 if (!error)
1125 return dummy.b_blocknr;
1126 return 0;
1127}
1128
1129struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1130{
1131 sector_t blknr = isofs_bmap(inode, block);
1132 if (!blknr)
1133 return NULL;
1134 return sb_bread(inode->i_sb, blknr);
1135}
1136
1137static int isofs_readpage(struct file *file, struct page *page)
1138{
1139 return mpage_readpage(page, isofs_get_block);
1140}
1141
1142static int isofs_readpages(struct file *file, struct address_space *mapping,
1143 struct list_head *pages, unsigned nr_pages)
1144{
1145 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1146}
1147
1148static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1149{
1150 return generic_block_bmap(mapping,block,isofs_get_block);
1151}
1152
1153static const struct address_space_operations isofs_aops = {
1154 .readpage = isofs_readpage,
1155 .readpages = isofs_readpages,
1156 .bmap = _isofs_bmap
1157};
1158
1159static int isofs_read_level3_size(struct inode *inode)
1160{
1161 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1162 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1163 struct buffer_head *bh = NULL;
1164 unsigned long block, offset, block_saved, offset_saved;
1165 int i = 0;
1166 int more_entries = 0;
1167 struct iso_directory_record *tmpde = NULL;
1168 struct iso_inode_info *ei = ISOFS_I(inode);
1169
1170 inode->i_size = 0;
1171
1172 /* The first 16 blocks are reserved as the System Area. Thus,
1173 * no inodes can appear in block 0. We use this to flag that
1174 * this is the last section. */
1175 ei->i_next_section_block = 0;
1176 ei->i_next_section_offset = 0;
1177
1178 block = ei->i_iget5_block;
1179 offset = ei->i_iget5_offset;
1180
1181 do {
1182 struct iso_directory_record *de;
1183 unsigned int de_len;
1184
1185 if (!bh) {
1186 bh = sb_bread(inode->i_sb, block);
1187 if (!bh)
1188 goto out_noread;
1189 }
1190 de = (struct iso_directory_record *) (bh->b_data + offset);
1191 de_len = *(unsigned char *) de;
1192
1193 if (de_len == 0) {
1194 brelse(bh);
1195 bh = NULL;
1196 ++block;
1197 offset = 0;
1198 continue;
1199 }
1200
1201 block_saved = block;
1202 offset_saved = offset;
1203 offset += de_len;
1204
1205 /* Make sure we have a full directory entry */
1206 if (offset >= bufsize) {
1207 int slop = bufsize - offset + de_len;
1208 if (!tmpde) {
1209 tmpde = kmalloc(256, GFP_KERNEL);
1210 if (!tmpde)
1211 goto out_nomem;
1212 }
1213 memcpy(tmpde, de, slop);
1214 offset &= bufsize - 1;
1215 block++;
1216 brelse(bh);
1217 bh = NULL;
1218 if (offset) {
1219 bh = sb_bread(inode->i_sb, block);
1220 if (!bh)
1221 goto out_noread;
1222 memcpy((void *)tmpde+slop, bh->b_data, offset);
1223 }
1224 de = tmpde;
1225 }
1226
1227 inode->i_size += isonum_733(de->size);
1228 if (i == 1) {
1229 ei->i_next_section_block = block_saved;
1230 ei->i_next_section_offset = offset_saved;
1231 }
1232
1233 more_entries = de->flags[-high_sierra] & 0x80;
1234
1235 i++;
1236 if (i > 100)
1237 goto out_toomany;
1238 } while (more_entries);
1239out:
1240 kfree(tmpde);
1241 if (bh)
1242 brelse(bh);
1243 return 0;
1244
1245out_nomem:
1246 if (bh)
1247 brelse(bh);
1248 return -ENOMEM;
1249
1250out_noread:
1251 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1252 kfree(tmpde);
1253 return -EIO;
1254
1255out_toomany:
1256 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1257 "isofs_read_level3_size: inode=%lu\n",
1258 __func__, inode->i_ino);
1259 goto out;
1260}
1261
1262static int isofs_read_inode(struct inode *inode)
1263{
1264 struct super_block *sb = inode->i_sb;
1265 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1266 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1267 unsigned long block;
1268 int high_sierra = sbi->s_high_sierra;
1269 struct buffer_head *bh = NULL;
1270 struct iso_directory_record *de;
1271 struct iso_directory_record *tmpde = NULL;
1272 unsigned int de_len;
1273 unsigned long offset;
1274 struct iso_inode_info *ei = ISOFS_I(inode);
1275 int ret = -EIO;
1276
1277 block = ei->i_iget5_block;
1278 bh = sb_bread(inode->i_sb, block);
1279 if (!bh)
1280 goto out_badread;
1281
1282 offset = ei->i_iget5_offset;
1283
1284 de = (struct iso_directory_record *) (bh->b_data + offset);
1285 de_len = *(unsigned char *) de;
1286
1287 if (offset + de_len > bufsize) {
1288 int frag1 = bufsize - offset;
1289
1290 tmpde = kmalloc(de_len, GFP_KERNEL);
1291 if (tmpde == NULL) {
1292 printk(KERN_INFO "%s: out of memory\n", __func__);
1293 ret = -ENOMEM;
1294 goto fail;
1295 }
1296 memcpy(tmpde, bh->b_data + offset, frag1);
1297 brelse(bh);
1298 bh = sb_bread(inode->i_sb, ++block);
1299 if (!bh)
1300 goto out_badread;
1301 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1302 de = tmpde;
1303 }
1304
1305 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1306 ei->i_iget5_offset,
1307 ISOFS_BUFFER_BITS(inode));
1308
1309 /* Assume it is a normal-format file unless told otherwise */
1310 ei->i_file_format = isofs_file_normal;
1311
1312 if (de->flags[-high_sierra] & 2) {
1313 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1314 inode->i_mode = S_IFDIR | sbi->s_dmode;
1315 else
1316 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1317 set_nlink(inode, 1); /*
1318 * Set to 1. We know there are 2, but
1319 * the find utility tries to optimize
1320 * if it is 2, and it screws up. It is
1321 * easier to give 1 which tells find to
1322 * do it the hard way.
1323 */
1324 } else {
1325 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1326 inode->i_mode = S_IFREG | sbi->s_fmode;
1327 } else {
1328 /*
1329 * Set default permissions: r-x for all. The disc
1330 * could be shared with DOS machines so virtually
1331 * anything could be a valid executable.
1332 */
1333 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1334 }
1335 set_nlink(inode, 1);
1336 }
1337 inode->i_uid = sbi->s_uid;
1338 inode->i_gid = sbi->s_gid;
1339 inode->i_blocks = 0;
1340
1341 ei->i_format_parm[0] = 0;
1342 ei->i_format_parm[1] = 0;
1343 ei->i_format_parm[2] = 0;
1344
1345 ei->i_section_size = isonum_733(de->size);
1346 if (de->flags[-high_sierra] & 0x80) {
1347 ret = isofs_read_level3_size(inode);
1348 if (ret < 0)
1349 goto fail;
1350 ret = -EIO;
1351 } else {
1352 ei->i_next_section_block = 0;
1353 ei->i_next_section_offset = 0;
1354 inode->i_size = isonum_733(de->size);
1355 }
1356
1357 /*
1358 * Some dipshit decided to store some other bit of information
1359 * in the high byte of the file length. Truncate size in case
1360 * this CDROM was mounted with the cruft option.
1361 */
1362
1363 if (sbi->s_cruft)
1364 inode->i_size &= 0x00ffffff;
1365
1366 if (de->interleave[0]) {
1367 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1368 inode->i_size = 0;
1369 }
1370
1371 /* I have no idea what file_unit_size is used for, so
1372 we will flag it for now */
1373 if (de->file_unit_size[0] != 0) {
1374 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1375 inode->i_ino);
1376 }
1377
1378 /* I have no idea what other flag bits are used for, so
1379 we will flag it for now */
1380#ifdef DEBUG
1381 if((de->flags[-high_sierra] & ~2)!= 0){
1382 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1383 "(%ld %x).\n",
1384 inode->i_ino, de->flags[-high_sierra]);
1385 }
1386#endif
1387
1388 inode->i_mtime.tv_sec =
1389 inode->i_atime.tv_sec =
1390 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1391 inode->i_mtime.tv_nsec =
1392 inode->i_atime.tv_nsec =
1393 inode->i_ctime.tv_nsec = 0;
1394
1395 ei->i_first_extent = (isonum_733(de->extent) +
1396 isonum_711(de->ext_attr_length));
1397
1398 /* Set the number of blocks for stat() - should be done before RR */
1399 inode->i_blocks = (inode->i_size + 511) >> 9;
1400
1401 /*
1402 * Now test for possible Rock Ridge extensions which will override
1403 * some of these numbers in the inode structure.
1404 */
1405
1406 if (!high_sierra) {
1407 parse_rock_ridge_inode(de, inode);
1408 /* if we want uid/gid set, override the rock ridge setting */
1409 if (sbi->s_uid_set)
1410 inode->i_uid = sbi->s_uid;
1411 if (sbi->s_gid_set)
1412 inode->i_gid = sbi->s_gid;
1413 }
1414 /* Now set final access rights if overriding rock ridge setting */
1415 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1416 sbi->s_dmode != ISOFS_INVALID_MODE)
1417 inode->i_mode = S_IFDIR | sbi->s_dmode;
1418 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1419 sbi->s_fmode != ISOFS_INVALID_MODE)
1420 inode->i_mode = S_IFREG | sbi->s_fmode;
1421
1422 /* Install the inode operations vector */
1423 if (S_ISREG(inode->i_mode)) {
1424 inode->i_fop = &generic_ro_fops;
1425 switch (ei->i_file_format) {
1426#ifdef CONFIG_ZISOFS
1427 case isofs_file_compressed:
1428 inode->i_data.a_ops = &zisofs_aops;
1429 break;
1430#endif
1431 default:
1432 inode->i_data.a_ops = &isofs_aops;
1433 break;
1434 }
1435 } else if (S_ISDIR(inode->i_mode)) {
1436 inode->i_op = &isofs_dir_inode_operations;
1437 inode->i_fop = &isofs_dir_operations;
1438 } else if (S_ISLNK(inode->i_mode)) {
1439 inode->i_op = &page_symlink_inode_operations;
1440 inode->i_data.a_ops = &isofs_symlink_aops;
1441 } else
1442 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1443 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1444
1445 ret = 0;
1446out:
1447 kfree(tmpde);
1448 if (bh)
1449 brelse(bh);
1450 return ret;
1451
1452out_badread:
1453 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1454fail:
1455 goto out;
1456}
1457
1458struct isofs_iget5_callback_data {
1459 unsigned long block;
1460 unsigned long offset;
1461};
1462
1463static int isofs_iget5_test(struct inode *ino, void *data)
1464{
1465 struct iso_inode_info *i = ISOFS_I(ino);
1466 struct isofs_iget5_callback_data *d =
1467 (struct isofs_iget5_callback_data*)data;
1468 return (i->i_iget5_block == d->block)
1469 && (i->i_iget5_offset == d->offset);
1470}
1471
1472static int isofs_iget5_set(struct inode *ino, void *data)
1473{
1474 struct iso_inode_info *i = ISOFS_I(ino);
1475 struct isofs_iget5_callback_data *d =
1476 (struct isofs_iget5_callback_data*)data;
1477 i->i_iget5_block = d->block;
1478 i->i_iget5_offset = d->offset;
1479 return 0;
1480}
1481
1482/* Store, in the inode's containing structure, the block and block
1483 * offset that point to the underlying meta-data for the inode. The
1484 * code below is otherwise similar to the iget() code in
1485 * include/linux/fs.h */
1486struct inode *isofs_iget(struct super_block *sb,
1487 unsigned long block,
1488 unsigned long offset)
1489{
1490 unsigned long hashval;
1491 struct inode *inode;
1492 struct isofs_iget5_callback_data data;
1493 long ret;
1494
1495 if (offset >= 1ul << sb->s_blocksize_bits)
1496 return ERR_PTR(-EINVAL);
1497
1498 data.block = block;
1499 data.offset = offset;
1500
1501 hashval = (block << sb->s_blocksize_bits) | offset;
1502
1503 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1504 &isofs_iget5_set, &data);
1505
1506 if (!inode)
1507 return ERR_PTR(-ENOMEM);
1508
1509 if (inode->i_state & I_NEW) {
1510 ret = isofs_read_inode(inode);
1511 if (ret < 0) {
1512 iget_failed(inode);
1513 inode = ERR_PTR(ret);
1514 } else {
1515 unlock_new_inode(inode);
1516 }
1517 }
1518
1519 return inode;
1520}
1521
1522static struct dentry *isofs_mount(struct file_system_type *fs_type,
1523 int flags, const char *dev_name, void *data)
1524{
1525 /* We don't support read-write mounts */
1526 if (!(flags & MS_RDONLY))
1527 return ERR_PTR(-EACCES);
1528 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1529}
1530
1531static struct file_system_type iso9660_fs_type = {
1532 .owner = THIS_MODULE,
1533 .name = "iso9660",
1534 .mount = isofs_mount,
1535 .kill_sb = kill_block_super,
1536 .fs_flags = FS_REQUIRES_DEV,
1537};
1538MODULE_ALIAS_FS("iso9660");
1539MODULE_ALIAS("iso9660");
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");
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/cred.h>
19#include <linux/nls.h>
20#include <linux/ctype.h>
21#include <linux/statfs.h>
22#include <linux/cdrom.h>
23#include <linux/parser.h>
24#include <linux/mpage.h>
25#include <linux/user_namespace.h>
26#include <linux/seq_file.h>
27
28#include "isofs.h"
29#include "zisofs.h"
30
31#define BEQUIET
32
33static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
34static int isofs_dentry_cmpi(const struct dentry *dentry,
35 unsigned int len, const char *str, const struct qstr *name);
36
37#ifdef CONFIG_JOLIET
38static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
39static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
40static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
41 unsigned int len, const char *str, const struct qstr *name);
42static int isofs_dentry_cmp_ms(const struct dentry *dentry,
43 unsigned int len, const char *str, const struct qstr *name);
44#endif
45
46static void isofs_put_super(struct super_block *sb)
47{
48 struct isofs_sb_info *sbi = ISOFS_SB(sb);
49
50#ifdef CONFIG_JOLIET
51 unload_nls(sbi->s_nls_iocharset);
52#endif
53
54 kfree(sbi);
55 sb->s_fs_info = NULL;
56 return;
57}
58
59static int isofs_read_inode(struct inode *, int relocated);
60static int isofs_statfs (struct dentry *, struct kstatfs *);
61static int isofs_show_options(struct seq_file *, struct dentry *);
62
63static struct kmem_cache *isofs_inode_cachep;
64
65static struct inode *isofs_alloc_inode(struct super_block *sb)
66{
67 struct iso_inode_info *ei;
68 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
69 if (!ei)
70 return NULL;
71 return &ei->vfs_inode;
72}
73
74static void isofs_i_callback(struct rcu_head *head)
75{
76 struct inode *inode = container_of(head, struct inode, i_rcu);
77 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
78}
79
80static void isofs_destroy_inode(struct inode *inode)
81{
82 call_rcu(&inode->i_rcu, isofs_i_callback);
83}
84
85static void init_once(void *foo)
86{
87 struct iso_inode_info *ei = foo;
88
89 inode_init_once(&ei->vfs_inode);
90}
91
92static int __init init_inodecache(void)
93{
94 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
95 sizeof(struct iso_inode_info),
96 0, (SLAB_RECLAIM_ACCOUNT|
97 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
98 init_once);
99 if (!isofs_inode_cachep)
100 return -ENOMEM;
101 return 0;
102}
103
104static void destroy_inodecache(void)
105{
106 /*
107 * Make sure all delayed rcu free inodes are flushed before we
108 * destroy cache.
109 */
110 rcu_barrier();
111 kmem_cache_destroy(isofs_inode_cachep);
112}
113
114static int isofs_remount(struct super_block *sb, int *flags, char *data)
115{
116 sync_filesystem(sb);
117 if (!(*flags & SB_RDONLY))
118 return -EROFS;
119 return 0;
120}
121
122static const struct super_operations isofs_sops = {
123 .alloc_inode = isofs_alloc_inode,
124 .destroy_inode = isofs_destroy_inode,
125 .put_super = isofs_put_super,
126 .statfs = isofs_statfs,
127 .remount_fs = isofs_remount,
128 .show_options = isofs_show_options,
129};
130
131
132static const struct dentry_operations isofs_dentry_ops[] = {
133 {
134 .d_hash = isofs_hashi,
135 .d_compare = isofs_dentry_cmpi,
136 },
137#ifdef CONFIG_JOLIET
138 {
139 .d_hash = isofs_hash_ms,
140 .d_compare = isofs_dentry_cmp_ms,
141 },
142 {
143 .d_hash = isofs_hashi_ms,
144 .d_compare = isofs_dentry_cmpi_ms,
145 },
146#endif
147};
148
149struct iso9660_options{
150 unsigned int rock:1;
151 unsigned int joliet:1;
152 unsigned int cruft:1;
153 unsigned int hide:1;
154 unsigned int showassoc:1;
155 unsigned int nocompress:1;
156 unsigned int overriderockperm:1;
157 unsigned int uid_set:1;
158 unsigned int gid_set:1;
159 unsigned int utf8:1;
160 unsigned char map;
161 unsigned char check;
162 unsigned int blocksize;
163 umode_t fmode;
164 umode_t dmode;
165 kgid_t gid;
166 kuid_t uid;
167 char *iocharset;
168 /* LVE */
169 s32 session;
170 s32 sbsector;
171};
172
173/*
174 * Compute the hash for the isofs name corresponding to the dentry.
175 */
176static int
177isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
178{
179 const char *name;
180 int len;
181 char c;
182 unsigned long hash;
183
184 len = qstr->len;
185 name = qstr->name;
186 if (ms) {
187 while (len && name[len-1] == '.')
188 len--;
189 }
190
191 hash = init_name_hash(dentry);
192 while (len--) {
193 c = tolower(*name++);
194 hash = partial_name_hash(c, hash);
195 }
196 qstr->hash = end_name_hash(hash);
197
198 return 0;
199}
200
201/*
202 * Compare of two isofs names.
203 */
204static int isofs_dentry_cmp_common(
205 unsigned int len, const char *str,
206 const struct qstr *name, int ms, int ci)
207{
208 int alen, blen;
209
210 /* A filename cannot end in '.' or we treat it like it has none */
211 alen = name->len;
212 blen = len;
213 if (ms) {
214 while (alen && name->name[alen-1] == '.')
215 alen--;
216 while (blen && str[blen-1] == '.')
217 blen--;
218 }
219 if (alen == blen) {
220 if (ci) {
221 if (strncasecmp(name->name, str, alen) == 0)
222 return 0;
223 } else {
224 if (strncmp(name->name, str, alen) == 0)
225 return 0;
226 }
227 }
228 return 1;
229}
230
231static int
232isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
233{
234 return isofs_hashi_common(dentry, qstr, 0);
235}
236
237static int
238isofs_dentry_cmpi(const struct dentry *dentry,
239 unsigned int len, const char *str, const struct qstr *name)
240{
241 return isofs_dentry_cmp_common(len, str, name, 0, 1);
242}
243
244#ifdef CONFIG_JOLIET
245/*
246 * Compute the hash for the isofs name corresponding to the dentry.
247 */
248static int
249isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
250{
251 const char *name;
252 int len;
253
254 len = qstr->len;
255 name = qstr->name;
256 if (ms) {
257 while (len && name[len-1] == '.')
258 len--;
259 }
260
261 qstr->hash = full_name_hash(dentry, name, len);
262
263 return 0;
264}
265
266static int
267isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
268{
269 return isofs_hash_common(dentry, qstr, 1);
270}
271
272static int
273isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
274{
275 return isofs_hashi_common(dentry, qstr, 1);
276}
277
278static int
279isofs_dentry_cmp_ms(const struct dentry *dentry,
280 unsigned int len, const char *str, const struct qstr *name)
281{
282 return isofs_dentry_cmp_common(len, str, name, 1, 0);
283}
284
285static int
286isofs_dentry_cmpi_ms(const struct dentry *dentry,
287 unsigned int len, const char *str, const struct qstr *name)
288{
289 return isofs_dentry_cmp_common(len, str, name, 1, 1);
290}
291#endif
292
293enum {
294 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
295 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
296 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
297 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
298};
299
300static const match_table_t tokens = {
301 {Opt_norock, "norock"},
302 {Opt_nojoliet, "nojoliet"},
303 {Opt_unhide, "unhide"},
304 {Opt_hide, "hide"},
305 {Opt_showassoc, "showassoc"},
306 {Opt_cruft, "cruft"},
307 {Opt_utf8, "utf8"},
308 {Opt_iocharset, "iocharset=%s"},
309 {Opt_map_a, "map=acorn"},
310 {Opt_map_a, "map=a"},
311 {Opt_map_n, "map=normal"},
312 {Opt_map_n, "map=n"},
313 {Opt_map_o, "map=off"},
314 {Opt_map_o, "map=o"},
315 {Opt_session, "session=%u"},
316 {Opt_sb, "sbsector=%u"},
317 {Opt_check_r, "check=relaxed"},
318 {Opt_check_r, "check=r"},
319 {Opt_check_s, "check=strict"},
320 {Opt_check_s, "check=s"},
321 {Opt_uid, "uid=%u"},
322 {Opt_gid, "gid=%u"},
323 {Opt_mode, "mode=%u"},
324 {Opt_dmode, "dmode=%u"},
325 {Opt_overriderockperm, "overriderockperm"},
326 {Opt_block, "block=%u"},
327 {Opt_ignore, "conv=binary"},
328 {Opt_ignore, "conv=b"},
329 {Opt_ignore, "conv=text"},
330 {Opt_ignore, "conv=t"},
331 {Opt_ignore, "conv=mtext"},
332 {Opt_ignore, "conv=m"},
333 {Opt_ignore, "conv=auto"},
334 {Opt_ignore, "conv=a"},
335 {Opt_nocompress, "nocompress"},
336 {Opt_err, NULL}
337};
338
339static int parse_options(char *options, struct iso9660_options *popt)
340{
341 char *p;
342 int option;
343
344 popt->map = 'n';
345 popt->rock = 1;
346 popt->joliet = 1;
347 popt->cruft = 0;
348 popt->hide = 0;
349 popt->showassoc = 0;
350 popt->check = 'u'; /* unset */
351 popt->nocompress = 0;
352 popt->blocksize = 1024;
353 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
354 popt->uid_set = 0;
355 popt->gid_set = 0;
356 popt->gid = GLOBAL_ROOT_GID;
357 popt->uid = GLOBAL_ROOT_UID;
358 popt->iocharset = NULL;
359 popt->utf8 = 0;
360 popt->overriderockperm = 0;
361 popt->session=-1;
362 popt->sbsector=-1;
363 if (!options)
364 return 1;
365
366 while ((p = strsep(&options, ",")) != NULL) {
367 int token;
368 substring_t args[MAX_OPT_ARGS];
369 unsigned n;
370
371 if (!*p)
372 continue;
373
374 token = match_token(p, tokens, args);
375 switch (token) {
376 case Opt_norock:
377 popt->rock = 0;
378 break;
379 case Opt_nojoliet:
380 popt->joliet = 0;
381 break;
382 case Opt_hide:
383 popt->hide = 1;
384 break;
385 case Opt_unhide:
386 case Opt_showassoc:
387 popt->showassoc = 1;
388 break;
389 case Opt_cruft:
390 popt->cruft = 1;
391 break;
392 case Opt_utf8:
393 popt->utf8 = 1;
394 break;
395#ifdef CONFIG_JOLIET
396 case Opt_iocharset:
397 kfree(popt->iocharset);
398 popt->iocharset = match_strdup(&args[0]);
399 if (!popt->iocharset)
400 return 0;
401 break;
402#endif
403 case Opt_map_a:
404 popt->map = 'a';
405 break;
406 case Opt_map_o:
407 popt->map = 'o';
408 break;
409 case Opt_map_n:
410 popt->map = 'n';
411 break;
412 case Opt_session:
413 if (match_int(&args[0], &option))
414 return 0;
415 n = option;
416 /*
417 * Track numbers are supposed to be in range 1-99, the
418 * mount option starts indexing at 0.
419 */
420 if (n >= 99)
421 return 0;
422 popt->session = n + 1;
423 break;
424 case Opt_sb:
425 if (match_int(&args[0], &option))
426 return 0;
427 popt->sbsector = option;
428 break;
429 case Opt_check_r:
430 popt->check = 'r';
431 break;
432 case Opt_check_s:
433 popt->check = 's';
434 break;
435 case Opt_ignore:
436 break;
437 case Opt_uid:
438 if (match_int(&args[0], &option))
439 return 0;
440 popt->uid = make_kuid(current_user_ns(), option);
441 if (!uid_valid(popt->uid))
442 return 0;
443 popt->uid_set = 1;
444 break;
445 case Opt_gid:
446 if (match_int(&args[0], &option))
447 return 0;
448 popt->gid = make_kgid(current_user_ns(), option);
449 if (!gid_valid(popt->gid))
450 return 0;
451 popt->gid_set = 1;
452 break;
453 case Opt_mode:
454 if (match_int(&args[0], &option))
455 return 0;
456 popt->fmode = option;
457 break;
458 case Opt_dmode:
459 if (match_int(&args[0], &option))
460 return 0;
461 popt->dmode = option;
462 break;
463 case Opt_overriderockperm:
464 popt->overriderockperm = 1;
465 break;
466 case Opt_block:
467 if (match_int(&args[0], &option))
468 return 0;
469 n = option;
470 if (n != 512 && n != 1024 && n != 2048)
471 return 0;
472 popt->blocksize = n;
473 break;
474 case Opt_nocompress:
475 popt->nocompress = 1;
476 break;
477 default:
478 return 0;
479 }
480 }
481 return 1;
482}
483
484/*
485 * Display the mount options in /proc/mounts.
486 */
487static int isofs_show_options(struct seq_file *m, struct dentry *root)
488{
489 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
490
491 if (!sbi->s_rock) seq_puts(m, ",norock");
492 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
493 if (sbi->s_cruft) seq_puts(m, ",cruft");
494 if (sbi->s_hide) seq_puts(m, ",hide");
495 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
496 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
497 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
498 if (sbi->s_utf8) seq_puts(m, ",utf8");
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 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
523 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
524#endif
525 return 0;
526}
527
528/*
529 * look if the driver can tell the multi session redirection value
530 *
531 * don't change this if you don't know what you do, please!
532 * Multisession is legal only with XA disks.
533 * A non-XA disk with more than one volume descriptor may do it right, but
534 * usually is written in a nowhere standardized "multi-partition" manner.
535 * Multisession uses absolute addressing (solely the first frame of the whole
536 * track is #0), multi-partition uses relative addressing (each first frame of
537 * each track is #0), and a track is not a session.
538 *
539 * A broken CDwriter software or drive firmware does not set new standards,
540 * at least not if conflicting with the existing ones.
541 *
542 * emoenke@gwdg.de
543 */
544#define WE_OBEY_THE_WRITTEN_STANDARDS 1
545
546static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
547{
548 struct cdrom_multisession ms_info;
549 unsigned int vol_desc_start;
550 struct block_device *bdev = sb->s_bdev;
551 int i;
552
553 vol_desc_start=0;
554 ms_info.addr_format=CDROM_LBA;
555 if (session > 0) {
556 struct cdrom_tocentry Te;
557 Te.cdte_track=session;
558 Te.cdte_format=CDROM_LBA;
559 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
560 if (!i) {
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 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
571 if (session > 0)
572 printk(KERN_ERR "ISOFS: Invalid session number\n");
573#if 0
574 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
575 if (i==0) {
576 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
577 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
578 }
579#endif
580 if (i==0)
581#if WE_OBEY_THE_WRITTEN_STANDARDS
582 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
583#endif
584 vol_desc_start=ms_info.addr.lba;
585 return vol_desc_start;
586}
587
588/*
589 * Check if root directory is empty (has less than 3 files).
590 *
591 * Used to detect broken CDs where ISO root directory is empty but Joliet root
592 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
593 * (and Joliet used instead) or else no files would be visible.
594 */
595static bool rootdir_empty(struct super_block *sb, unsigned long block)
596{
597 int offset = 0, files = 0, de_len;
598 struct iso_directory_record *de;
599 struct buffer_head *bh;
600
601 bh = sb_bread(sb, block);
602 if (!bh)
603 return true;
604 while (files < 3) {
605 de = (struct iso_directory_record *) (bh->b_data + offset);
606 de_len = *(unsigned char *) de;
607 if (de_len == 0)
608 break;
609 files++;
610 offset += de_len;
611 }
612 brelse(bh);
613 return files < 3;
614}
615
616/*
617 * Initialize the superblock and read the root inode.
618 *
619 * Note: a check_disk_change() has been done immediately prior
620 * to this call, so we don't need to check again.
621 */
622static int isofs_fill_super(struct super_block *s, void *data, int silent)
623{
624 struct buffer_head *bh = NULL, *pri_bh = NULL;
625 struct hs_primary_descriptor *h_pri = NULL;
626 struct iso_primary_descriptor *pri = NULL;
627 struct iso_supplementary_descriptor *sec = NULL;
628 struct iso_directory_record *rootp;
629 struct inode *inode;
630 struct iso9660_options opt;
631 struct isofs_sb_info *sbi;
632 unsigned long first_data_zone;
633 int joliet_level = 0;
634 int iso_blknum, block;
635 int orig_zonesize;
636 int table, error = -EINVAL;
637 unsigned int vol_desc_start;
638
639 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
640 if (!sbi)
641 return -ENOMEM;
642 s->s_fs_info = sbi;
643
644 if (!parse_options((char *)data, &opt))
645 goto out_freesbi;
646
647 /*
648 * First of all, get the hardware blocksize for this device.
649 * If we don't know what it is, or the hardware blocksize is
650 * larger than the blocksize the user specified, then use
651 * that value.
652 */
653 /*
654 * What if bugger tells us to go beyond page size?
655 */
656 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
657
658 sbi->s_high_sierra = 0; /* default is iso9660 */
659 sbi->s_session = opt.session;
660 sbi->s_sbsector = opt.sbsector;
661
662 vol_desc_start = (opt.sbsector != -1) ?
663 opt.sbsector : isofs_get_last_session(s,opt.session);
664
665 for (iso_blknum = vol_desc_start+16;
666 iso_blknum < vol_desc_start+100; iso_blknum++) {
667 struct hs_volume_descriptor *hdp;
668 struct iso_volume_descriptor *vdp;
669
670 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
671 if (!(bh = sb_bread(s, block)))
672 goto out_no_read;
673
674 vdp = (struct iso_volume_descriptor *)bh->b_data;
675 hdp = (struct hs_volume_descriptor *)bh->b_data;
676
677 /*
678 * Due to the overlapping physical location of the descriptors,
679 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
680 * proper identification in this case, we first check for ISO.
681 */
682 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
683 if (isonum_711(vdp->type) == ISO_VD_END)
684 break;
685 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
686 if (!pri) {
687 pri = (struct iso_primary_descriptor *)vdp;
688 /* Save the buffer in case we need it ... */
689 pri_bh = bh;
690 bh = NULL;
691 }
692 }
693#ifdef CONFIG_JOLIET
694 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
695 sec = (struct iso_supplementary_descriptor *)vdp;
696 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
697 if (opt.joliet) {
698 if (sec->escape[2] == 0x40)
699 joliet_level = 1;
700 else if (sec->escape[2] == 0x43)
701 joliet_level = 2;
702 else if (sec->escape[2] == 0x45)
703 joliet_level = 3;
704
705 printk(KERN_DEBUG "ISO 9660 Extensions: "
706 "Microsoft Joliet Level %d\n",
707 joliet_level);
708 }
709 goto root_found;
710 } else {
711 /* Unknown supplementary volume descriptor */
712 sec = NULL;
713 }
714 }
715#endif
716 } else {
717 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
718 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
719 goto out_freebh;
720
721 sbi->s_high_sierra = 1;
722 opt.rock = 0;
723 h_pri = (struct hs_primary_descriptor *)vdp;
724 goto root_found;
725 }
726 }
727
728 /* Just skip any volume descriptors we don't recognize */
729
730 brelse(bh);
731 bh = NULL;
732 }
733 /*
734 * If we fall through, either no volume descriptor was found,
735 * or else we passed a primary descriptor looking for others.
736 */
737 if (!pri)
738 goto out_unknown_format;
739 brelse(bh);
740 bh = pri_bh;
741 pri_bh = NULL;
742
743root_found:
744 /* We don't support read-write mounts */
745 if (!sb_rdonly(s)) {
746 error = -EACCES;
747 goto out_freebh;
748 }
749
750 if (joliet_level && (!pri || !opt.rock)) {
751 /* This is the case of Joliet with the norock mount flag.
752 * A disc with both Joliet and Rock Ridge is handled later
753 */
754 pri = (struct iso_primary_descriptor *) sec;
755 }
756
757 if(sbi->s_high_sierra){
758 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
759 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
760 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
761 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
762 } else {
763 if (!pri)
764 goto out_freebh;
765 rootp = (struct iso_directory_record *) pri->root_directory_record;
766 sbi->s_nzones = isonum_733(pri->volume_space_size);
767 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
768 sbi->s_max_size = isonum_733(pri->volume_space_size);
769 }
770
771 sbi->s_ninodes = 0; /* No way to figure this out easily */
772
773 orig_zonesize = sbi->s_log_zone_size;
774 /*
775 * If the zone size is smaller than the hardware sector size,
776 * this is a fatal error. This would occur if the disc drive
777 * had sectors that were 2048 bytes, but the filesystem had
778 * blocks that were 512 bytes (which should only very rarely
779 * happen.)
780 */
781 if (orig_zonesize < opt.blocksize)
782 goto out_bad_size;
783
784 /* RDE: convert log zone size to bit shift */
785 switch (sbi->s_log_zone_size) {
786 case 512: sbi->s_log_zone_size = 9; break;
787 case 1024: sbi->s_log_zone_size = 10; break;
788 case 2048: sbi->s_log_zone_size = 11; break;
789
790 default:
791 goto out_bad_zone_size;
792 }
793
794 s->s_magic = ISOFS_SUPER_MAGIC;
795
796 /*
797 * With multi-extent files, file size is only limited by the maximum
798 * size of a file system, which is 8 TB.
799 */
800 s->s_maxbytes = 0x80000000000LL;
801
802 /* Set this for reference. Its not currently used except on write
803 which we don't have .. */
804
805 first_data_zone = isonum_733(rootp->extent) +
806 isonum_711(rootp->ext_attr_length);
807 sbi->s_firstdatazone = first_data_zone;
808#ifndef BEQUIET
809 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
810 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
811 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
812 if(sbi->s_high_sierra)
813 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
814#endif
815
816 /*
817 * If the Joliet level is set, we _may_ decide to use the
818 * secondary descriptor, but can't be sure until after we
819 * read the root inode. But before reading the root inode
820 * we may need to change the device blocksize, and would
821 * rather release the old buffer first. So, we cache the
822 * first_data_zone value from the secondary descriptor.
823 */
824 if (joliet_level) {
825 pri = (struct iso_primary_descriptor *) sec;
826 rootp = (struct iso_directory_record *)
827 pri->root_directory_record;
828 first_data_zone = isonum_733(rootp->extent) +
829 isonum_711(rootp->ext_attr_length);
830 }
831
832 /*
833 * We're all done using the volume descriptor, and may need
834 * to change the device blocksize, so release the buffer now.
835 */
836 brelse(pri_bh);
837 brelse(bh);
838
839 /*
840 * Force the blocksize to 512 for 512 byte sectors. The file
841 * read primitives really get it wrong in a bad way if we don't
842 * do this.
843 *
844 * Note - we should never be setting the blocksize to something
845 * less than the hardware sector size for the device. If we
846 * do, we would end up having to read larger buffers and split
847 * out portions to satisfy requests.
848 *
849 * Note2- the idea here is that we want to deal with the optimal
850 * zonesize in the filesystem. If we have it set to something less,
851 * then we have horrible problems with trying to piece together
852 * bits of adjacent blocks in order to properly read directory
853 * entries. By forcing the blocksize in this way, we ensure
854 * that we will never be required to do this.
855 */
856 sb_set_blocksize(s, orig_zonesize);
857
858 sbi->s_nls_iocharset = NULL;
859
860#ifdef CONFIG_JOLIET
861 if (joliet_level && opt.utf8 == 0) {
862 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
863 sbi->s_nls_iocharset = load_nls(p);
864 if (! sbi->s_nls_iocharset) {
865 /* Fail only if explicit charset specified */
866 if (opt.iocharset)
867 goto out_freesbi;
868 sbi->s_nls_iocharset = load_nls_default();
869 }
870 }
871#endif
872 s->s_op = &isofs_sops;
873 s->s_export_op = &isofs_export_ops;
874 sbi->s_mapping = opt.map;
875 sbi->s_rock = (opt.rock ? 2 : 0);
876 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
877 sbi->s_cruft = opt.cruft;
878 sbi->s_hide = opt.hide;
879 sbi->s_showassoc = opt.showassoc;
880 sbi->s_uid = opt.uid;
881 sbi->s_gid = opt.gid;
882 sbi->s_uid_set = opt.uid_set;
883 sbi->s_gid_set = opt.gid_set;
884 sbi->s_utf8 = opt.utf8;
885 sbi->s_nocompress = opt.nocompress;
886 sbi->s_overriderockperm = opt.overriderockperm;
887 /*
888 * It would be incredibly stupid to allow people to mark every file
889 * on the disk as suid, so we merely allow them to set the default
890 * permissions.
891 */
892 if (opt.fmode != ISOFS_INVALID_MODE)
893 sbi->s_fmode = opt.fmode & 0777;
894 else
895 sbi->s_fmode = ISOFS_INVALID_MODE;
896 if (opt.dmode != ISOFS_INVALID_MODE)
897 sbi->s_dmode = opt.dmode & 0777;
898 else
899 sbi->s_dmode = ISOFS_INVALID_MODE;
900
901 /*
902 * Read the root inode, which _may_ result in changing
903 * the s_rock flag. Once we have the final s_rock value,
904 * we then decide whether to use the Joliet descriptor.
905 */
906 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
907 if (IS_ERR(inode))
908 goto out_no_root;
909
910 /*
911 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
912 * correct Joliet root directory.
913 */
914 if (sbi->s_rock == 1 && joliet_level &&
915 rootdir_empty(s, sbi->s_firstdatazone)) {
916 printk(KERN_NOTICE
917 "ISOFS: primary root directory is empty. "
918 "Disabling Rock Ridge and switching to Joliet.");
919 sbi->s_rock = 0;
920 }
921
922 /*
923 * If this disk has both Rock Ridge and Joliet on it, then we
924 * want to use Rock Ridge by default. This can be overridden
925 * by using the norock mount option. There is still one other
926 * possibility that is not taken into account: a Rock Ridge
927 * CD with Unicode names. Until someone sees such a beast, it
928 * will not be supported.
929 */
930 if (sbi->s_rock == 1) {
931 joliet_level = 0;
932 } else if (joliet_level) {
933 sbi->s_rock = 0;
934 if (sbi->s_firstdatazone != first_data_zone) {
935 sbi->s_firstdatazone = first_data_zone;
936 printk(KERN_DEBUG
937 "ISOFS: changing to secondary root\n");
938 iput(inode);
939 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
940 if (IS_ERR(inode))
941 goto out_no_root;
942 }
943 }
944
945 if (opt.check == 'u') {
946 /* Only Joliet is case insensitive by default */
947 if (joliet_level)
948 opt.check = 'r';
949 else
950 opt.check = 's';
951 }
952 sbi->s_joliet_level = joliet_level;
953
954 /* Make sure the root inode is a directory */
955 if (!S_ISDIR(inode->i_mode)) {
956 printk(KERN_WARNING
957 "isofs_fill_super: root inode is not a directory. "
958 "Corrupted media?\n");
959 goto out_iput;
960 }
961
962 table = 0;
963 if (joliet_level)
964 table += 2;
965 if (opt.check == 'r')
966 table++;
967 sbi->s_check = opt.check;
968
969 if (table)
970 s->s_d_op = &isofs_dentry_ops[table - 1];
971
972 /* get the root dentry */
973 s->s_root = d_make_root(inode);
974 if (!(s->s_root)) {
975 error = -ENOMEM;
976 goto out_no_inode;
977 }
978
979 kfree(opt.iocharset);
980
981 return 0;
982
983 /*
984 * Display error messages and free resources.
985 */
986out_iput:
987 iput(inode);
988 goto out_no_inode;
989out_no_root:
990 error = PTR_ERR(inode);
991 if (error != -ENOMEM)
992 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
993out_no_inode:
994#ifdef CONFIG_JOLIET
995 unload_nls(sbi->s_nls_iocharset);
996#endif
997 goto out_freesbi;
998out_no_read:
999 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1000 __func__, s->s_id, iso_blknum, block);
1001 goto out_freebh;
1002out_bad_zone_size:
1003 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1004 sbi->s_log_zone_size);
1005 goto out_freebh;
1006out_bad_size:
1007 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1008 orig_zonesize, opt.blocksize);
1009 goto out_freebh;
1010out_unknown_format:
1011 if (!silent)
1012 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1013
1014out_freebh:
1015 brelse(bh);
1016 brelse(pri_bh);
1017out_freesbi:
1018 kfree(opt.iocharset);
1019 kfree(sbi);
1020 s->s_fs_info = NULL;
1021 return error;
1022}
1023
1024static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1025{
1026 struct super_block *sb = dentry->d_sb;
1027 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1028
1029 buf->f_type = ISOFS_SUPER_MAGIC;
1030 buf->f_bsize = sb->s_blocksize;
1031 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1032 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1033 buf->f_bfree = 0;
1034 buf->f_bavail = 0;
1035 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1036 buf->f_ffree = 0;
1037 buf->f_fsid.val[0] = (u32)id;
1038 buf->f_fsid.val[1] = (u32)(id >> 32);
1039 buf->f_namelen = NAME_MAX;
1040 return 0;
1041}
1042
1043/*
1044 * Get a set of blocks; filling in buffer_heads if already allocated
1045 * or getblk() if they are not. Returns the number of blocks inserted
1046 * (-ve == error.)
1047 */
1048int isofs_get_blocks(struct inode *inode, sector_t iblock,
1049 struct buffer_head **bh, unsigned long nblocks)
1050{
1051 unsigned long b_off = iblock;
1052 unsigned offset, sect_size;
1053 unsigned int firstext;
1054 unsigned long nextblk, nextoff;
1055 int section, rv, error;
1056 struct iso_inode_info *ei = ISOFS_I(inode);
1057
1058 error = -EIO;
1059 rv = 0;
1060 if (iblock != b_off) {
1061 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1062 goto abort;
1063 }
1064
1065
1066 offset = 0;
1067 firstext = ei->i_first_extent;
1068 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1069 nextblk = ei->i_next_section_block;
1070 nextoff = ei->i_next_section_offset;
1071 section = 0;
1072
1073 while (nblocks) {
1074 /* If we are *way* beyond the end of the file, print a message.
1075 * Access beyond the end of the file up to the next page boundary
1076 * is normal, however because of the way the page cache works.
1077 * In this case, we just return 0 so that we can properly fill
1078 * the page with useless information without generating any
1079 * I/O errors.
1080 */
1081 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1082 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1083 __func__, b_off,
1084 (unsigned long long)inode->i_size);
1085 goto abort;
1086 }
1087
1088 /* On the last section, nextblk == 0, section size is likely to
1089 * exceed sect_size by a partial block, and access beyond the
1090 * end of the file will reach beyond the section size, too.
1091 */
1092 while (nextblk && (b_off >= (offset + sect_size))) {
1093 struct inode *ninode;
1094
1095 offset += sect_size;
1096 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1097 if (IS_ERR(ninode)) {
1098 error = PTR_ERR(ninode);
1099 goto abort;
1100 }
1101 firstext = ISOFS_I(ninode)->i_first_extent;
1102 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1103 nextblk = ISOFS_I(ninode)->i_next_section_block;
1104 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1105 iput(ninode);
1106
1107 if (++section > 100) {
1108 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1109 " aborting...\n", __func__);
1110 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1111 "nextblk=%lu nextoff=%lu\n", __func__,
1112 b_off, firstext, (unsigned) sect_size,
1113 nextblk, nextoff);
1114 goto abort;
1115 }
1116 }
1117
1118 if (*bh) {
1119 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1120 } else {
1121 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1122 if (!*bh)
1123 goto abort;
1124 }
1125 bh++; /* Next buffer head */
1126 b_off++; /* Next buffer offset */
1127 nblocks--;
1128 rv++;
1129 }
1130
1131 error = 0;
1132abort:
1133 return rv != 0 ? rv : error;
1134}
1135
1136/*
1137 * Used by the standard interfaces.
1138 */
1139static int isofs_get_block(struct inode *inode, sector_t iblock,
1140 struct buffer_head *bh_result, int create)
1141{
1142 int ret;
1143
1144 if (create) {
1145 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1146 return -EROFS;
1147 }
1148
1149 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1150 return ret < 0 ? ret : 0;
1151}
1152
1153static int isofs_bmap(struct inode *inode, sector_t block)
1154{
1155 struct buffer_head dummy;
1156 int error;
1157
1158 dummy.b_state = 0;
1159 dummy.b_blocknr = -1000;
1160 error = isofs_get_block(inode, block, &dummy, 0);
1161 if (!error)
1162 return dummy.b_blocknr;
1163 return 0;
1164}
1165
1166struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1167{
1168 sector_t blknr = isofs_bmap(inode, block);
1169 if (!blknr)
1170 return NULL;
1171 return sb_bread(inode->i_sb, blknr);
1172}
1173
1174static int isofs_readpage(struct file *file, struct page *page)
1175{
1176 return mpage_readpage(page, isofs_get_block);
1177}
1178
1179static int isofs_readpages(struct file *file, struct address_space *mapping,
1180 struct list_head *pages, unsigned nr_pages)
1181{
1182 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1183}
1184
1185static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1186{
1187 return generic_block_bmap(mapping,block,isofs_get_block);
1188}
1189
1190static const struct address_space_operations isofs_aops = {
1191 .readpage = isofs_readpage,
1192 .readpages = isofs_readpages,
1193 .bmap = _isofs_bmap
1194};
1195
1196static int isofs_read_level3_size(struct inode *inode)
1197{
1198 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1199 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1200 struct buffer_head *bh = NULL;
1201 unsigned long block, offset, block_saved, offset_saved;
1202 int i = 0;
1203 int more_entries = 0;
1204 struct iso_directory_record *tmpde = NULL;
1205 struct iso_inode_info *ei = ISOFS_I(inode);
1206
1207 inode->i_size = 0;
1208
1209 /* The first 16 blocks are reserved as the System Area. Thus,
1210 * no inodes can appear in block 0. We use this to flag that
1211 * this is the last section. */
1212 ei->i_next_section_block = 0;
1213 ei->i_next_section_offset = 0;
1214
1215 block = ei->i_iget5_block;
1216 offset = ei->i_iget5_offset;
1217
1218 do {
1219 struct iso_directory_record *de;
1220 unsigned int de_len;
1221
1222 if (!bh) {
1223 bh = sb_bread(inode->i_sb, block);
1224 if (!bh)
1225 goto out_noread;
1226 }
1227 de = (struct iso_directory_record *) (bh->b_data + offset);
1228 de_len = *(unsigned char *) de;
1229
1230 if (de_len == 0) {
1231 brelse(bh);
1232 bh = NULL;
1233 ++block;
1234 offset = 0;
1235 continue;
1236 }
1237
1238 block_saved = block;
1239 offset_saved = offset;
1240 offset += de_len;
1241
1242 /* Make sure we have a full directory entry */
1243 if (offset >= bufsize) {
1244 int slop = bufsize - offset + de_len;
1245 if (!tmpde) {
1246 tmpde = kmalloc(256, GFP_KERNEL);
1247 if (!tmpde)
1248 goto out_nomem;
1249 }
1250 memcpy(tmpde, de, slop);
1251 offset &= bufsize - 1;
1252 block++;
1253 brelse(bh);
1254 bh = NULL;
1255 if (offset) {
1256 bh = sb_bread(inode->i_sb, block);
1257 if (!bh)
1258 goto out_noread;
1259 memcpy((void *)tmpde+slop, bh->b_data, offset);
1260 }
1261 de = tmpde;
1262 }
1263
1264 inode->i_size += isonum_733(de->size);
1265 if (i == 1) {
1266 ei->i_next_section_block = block_saved;
1267 ei->i_next_section_offset = offset_saved;
1268 }
1269
1270 more_entries = de->flags[-high_sierra] & 0x80;
1271
1272 i++;
1273 if (i > 100)
1274 goto out_toomany;
1275 } while (more_entries);
1276out:
1277 kfree(tmpde);
1278 if (bh)
1279 brelse(bh);
1280 return 0;
1281
1282out_nomem:
1283 if (bh)
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
1324 if (offset + de_len > bufsize) {
1325 int frag1 = bufsize - offset;
1326
1327 tmpde = kmalloc(de_len, GFP_KERNEL);
1328 if (!tmpde) {
1329 ret = -ENOMEM;
1330 goto fail;
1331 }
1332 memcpy(tmpde, bh->b_data + offset, frag1);
1333 brelse(bh);
1334 bh = sb_bread(inode->i_sb, ++block);
1335 if (!bh)
1336 goto out_badread;
1337 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1338 de = tmpde;
1339 }
1340
1341 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1342 ei->i_iget5_offset,
1343 ISOFS_BUFFER_BITS(inode));
1344
1345 /* Assume it is a normal-format file unless told otherwise */
1346 ei->i_file_format = isofs_file_normal;
1347
1348 if (de->flags[-high_sierra] & 2) {
1349 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1350 inode->i_mode = S_IFDIR | sbi->s_dmode;
1351 else
1352 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1353 set_nlink(inode, 1); /*
1354 * Set to 1. We know there are 2, but
1355 * the find utility tries to optimize
1356 * if it is 2, and it screws up. It is
1357 * easier to give 1 which tells find to
1358 * do it the hard way.
1359 */
1360 } else {
1361 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1362 inode->i_mode = S_IFREG | sbi->s_fmode;
1363 } else {
1364 /*
1365 * Set default permissions: r-x for all. The disc
1366 * could be shared with DOS machines so virtually
1367 * anything could be a valid executable.
1368 */
1369 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1370 }
1371 set_nlink(inode, 1);
1372 }
1373 inode->i_uid = sbi->s_uid;
1374 inode->i_gid = sbi->s_gid;
1375 inode->i_blocks = 0;
1376
1377 ei->i_format_parm[0] = 0;
1378 ei->i_format_parm[1] = 0;
1379 ei->i_format_parm[2] = 0;
1380
1381 ei->i_section_size = isonum_733(de->size);
1382 if (de->flags[-high_sierra] & 0x80) {
1383 ret = isofs_read_level3_size(inode);
1384 if (ret < 0)
1385 goto fail;
1386 ret = -EIO;
1387 } else {
1388 ei->i_next_section_block = 0;
1389 ei->i_next_section_offset = 0;
1390 inode->i_size = isonum_733(de->size);
1391 }
1392
1393 /*
1394 * Some dipshit decided to store some other bit of information
1395 * in the high byte of the file length. Truncate size in case
1396 * this CDROM was mounted with the cruft option.
1397 */
1398
1399 if (sbi->s_cruft)
1400 inode->i_size &= 0x00ffffff;
1401
1402 if (de->interleave[0]) {
1403 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1404 inode->i_size = 0;
1405 }
1406
1407 /* I have no idea what file_unit_size is used for, so
1408 we will flag it for now */
1409 if (de->file_unit_size[0] != 0) {
1410 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1411 inode->i_ino);
1412 }
1413
1414 /* I have no idea what other flag bits are used for, so
1415 we will flag it for now */
1416#ifdef DEBUG
1417 if((de->flags[-high_sierra] & ~2)!= 0){
1418 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1419 "(%ld %x).\n",
1420 inode->i_ino, de->flags[-high_sierra]);
1421 }
1422#endif
1423
1424 inode->i_mtime.tv_sec =
1425 inode->i_atime.tv_sec =
1426 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1427 inode->i_mtime.tv_nsec =
1428 inode->i_atime.tv_nsec =
1429 inode->i_ctime.tv_nsec = 0;
1430
1431 ei->i_first_extent = (isonum_733(de->extent) +
1432 isonum_711(de->ext_attr_length));
1433
1434 /* Set the number of blocks for stat() - should be done before RR */
1435 inode->i_blocks = (inode->i_size + 511) >> 9;
1436
1437 /*
1438 * Now test for possible Rock Ridge extensions which will override
1439 * some of these numbers in the inode structure.
1440 */
1441
1442 if (!high_sierra) {
1443 parse_rock_ridge_inode(de, inode, relocated);
1444 /* if we want uid/gid set, override the rock ridge setting */
1445 if (sbi->s_uid_set)
1446 inode->i_uid = sbi->s_uid;
1447 if (sbi->s_gid_set)
1448 inode->i_gid = sbi->s_gid;
1449 }
1450 /* Now set final access rights if overriding rock ridge setting */
1451 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1452 sbi->s_dmode != ISOFS_INVALID_MODE)
1453 inode->i_mode = S_IFDIR | sbi->s_dmode;
1454 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1455 sbi->s_fmode != ISOFS_INVALID_MODE)
1456 inode->i_mode = S_IFREG | sbi->s_fmode;
1457
1458 /* Install the inode operations vector */
1459 if (S_ISREG(inode->i_mode)) {
1460 inode->i_fop = &generic_ro_fops;
1461 switch (ei->i_file_format) {
1462#ifdef CONFIG_ZISOFS
1463 case isofs_file_compressed:
1464 inode->i_data.a_ops = &zisofs_aops;
1465 break;
1466#endif
1467 default:
1468 inode->i_data.a_ops = &isofs_aops;
1469 break;
1470 }
1471 } else if (S_ISDIR(inode->i_mode)) {
1472 inode->i_op = &isofs_dir_inode_operations;
1473 inode->i_fop = &isofs_dir_operations;
1474 } else if (S_ISLNK(inode->i_mode)) {
1475 inode->i_op = &page_symlink_inode_operations;
1476 inode_nohighmem(inode);
1477 inode->i_data.a_ops = &isofs_symlink_aops;
1478 } else
1479 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1480 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1481
1482 ret = 0;
1483out:
1484 kfree(tmpde);
1485 if (bh)
1486 brelse(bh);
1487 return ret;
1488
1489out_badread:
1490 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1491fail:
1492 goto out;
1493}
1494
1495struct isofs_iget5_callback_data {
1496 unsigned long block;
1497 unsigned long offset;
1498};
1499
1500static int isofs_iget5_test(struct inode *ino, void *data)
1501{
1502 struct iso_inode_info *i = ISOFS_I(ino);
1503 struct isofs_iget5_callback_data *d =
1504 (struct isofs_iget5_callback_data*)data;
1505 return (i->i_iget5_block == d->block)
1506 && (i->i_iget5_offset == d->offset);
1507}
1508
1509static int isofs_iget5_set(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 i->i_iget5_block = d->block;
1515 i->i_iget5_offset = d->offset;
1516 return 0;
1517}
1518
1519/* Store, in the inode's containing structure, the block and block
1520 * offset that point to the underlying meta-data for the inode. The
1521 * code below is otherwise similar to the iget() code in
1522 * include/linux/fs.h */
1523struct inode *__isofs_iget(struct super_block *sb,
1524 unsigned long block,
1525 unsigned long offset,
1526 int relocated)
1527{
1528 unsigned long hashval;
1529 struct inode *inode;
1530 struct isofs_iget5_callback_data data;
1531 long ret;
1532
1533 if (offset >= 1ul << sb->s_blocksize_bits)
1534 return ERR_PTR(-EINVAL);
1535
1536 data.block = block;
1537 data.offset = offset;
1538
1539 hashval = (block << sb->s_blocksize_bits) | offset;
1540
1541 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1542 &isofs_iget5_set, &data);
1543
1544 if (!inode)
1545 return ERR_PTR(-ENOMEM);
1546
1547 if (inode->i_state & I_NEW) {
1548 ret = isofs_read_inode(inode, relocated);
1549 if (ret < 0) {
1550 iget_failed(inode);
1551 inode = ERR_PTR(ret);
1552 } else {
1553 unlock_new_inode(inode);
1554 }
1555 }
1556
1557 return inode;
1558}
1559
1560static struct dentry *isofs_mount(struct file_system_type *fs_type,
1561 int flags, const char *dev_name, void *data)
1562{
1563 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1564}
1565
1566static struct file_system_type iso9660_fs_type = {
1567 .owner = THIS_MODULE,
1568 .name = "iso9660",
1569 .mount = isofs_mount,
1570 .kill_sb = kill_block_super,
1571 .fs_flags = FS_REQUIRES_DEV,
1572};
1573MODULE_ALIAS_FS("iso9660");
1574MODULE_ALIAS("iso9660");
1575
1576static int __init init_iso9660_fs(void)
1577{
1578 int err = init_inodecache();
1579 if (err)
1580 goto out;
1581#ifdef CONFIG_ZISOFS
1582 err = zisofs_init();
1583 if (err)
1584 goto out1;
1585#endif
1586 err = register_filesystem(&iso9660_fs_type);
1587 if (err)
1588 goto out2;
1589 return 0;
1590out2:
1591#ifdef CONFIG_ZISOFS
1592 zisofs_cleanup();
1593out1:
1594#endif
1595 destroy_inodecache();
1596out:
1597 return err;
1598}
1599
1600static void __exit exit_iso9660_fs(void)
1601{
1602 unregister_filesystem(&iso9660_fs_type);
1603#ifdef CONFIG_ZISOFS
1604 zisofs_cleanup();
1605#endif
1606 destroy_inodecache();
1607}
1608
1609module_init(init_iso9660_fs)
1610module_exit(exit_iso9660_fs)
1611MODULE_LICENSE("GPL");