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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// 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/mpage.h>
25#include <linux/user_namespace.h>
26#include <linux/seq_file.h>
27#include <linux/blkdev.h>
28#include <linux/fs_context.h>
29#include <linux/fs_parser.h>
30
31#include "isofs.h"
32#include "zisofs.h"
33
34/* max tz offset is 13 hours */
35#define MAX_TZ_OFFSET (52*15*60)
36
37#define BEQUIET
38
39static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
40static int isofs_dentry_cmpi(const struct dentry *dentry,
41 unsigned int len, const char *str, const struct qstr *name);
42
43#ifdef CONFIG_JOLIET
44static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
45static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
46static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
47 unsigned int len, const char *str, const struct qstr *name);
48static int isofs_dentry_cmp_ms(const struct dentry *dentry,
49 unsigned int len, const char *str, const struct qstr *name);
50#endif
51
52static void isofs_put_super(struct super_block *sb)
53{
54 struct isofs_sb_info *sbi = ISOFS_SB(sb);
55
56#ifdef CONFIG_JOLIET
57 unload_nls(sbi->s_nls_iocharset);
58#endif
59
60 kfree(sbi);
61 sb->s_fs_info = NULL;
62 return;
63}
64
65static int isofs_read_inode(struct inode *, int relocated);
66static int isofs_statfs (struct dentry *, struct kstatfs *);
67static int isofs_show_options(struct seq_file *, struct dentry *);
68
69static struct kmem_cache *isofs_inode_cachep;
70
71static struct inode *isofs_alloc_inode(struct super_block *sb)
72{
73 struct iso_inode_info *ei;
74 ei = alloc_inode_sb(sb, isofs_inode_cachep, GFP_KERNEL);
75 if (!ei)
76 return NULL;
77 return &ei->vfs_inode;
78}
79
80static void isofs_free_inode(struct inode *inode)
81{
82 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
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_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_reconfigure(struct fs_context *fc)
115{
116 sync_filesystem(fc->root->d_sb);
117 if (!(fc->sb_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 .free_inode = isofs_free_inode,
125 .put_super = isofs_put_super,
126 .statfs = isofs_statfs,
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 isofs_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, Opt_cruft, Opt_gid, Opt_ignore, Opt_iocharset,
293 Opt_map, Opt_mode, Opt_nojoliet, Opt_norock, Opt_sb, Opt_session,
294 Opt_uid, Opt_unhide, Opt_utf8, Opt_err, Opt_nocompress, Opt_hide,
295 Opt_showassoc, Opt_dmode, Opt_overriderockperm,
296};
297
298static const struct constant_table isofs_param_map[] = {
299 {"acorn", 'a'},
300 {"a", 'a'},
301 {"normal", 'n'},
302 {"n", 'n'},
303 {"off", 'o'},
304 {"o", 'o'},
305 {}
306};
307
308static const struct constant_table isofs_param_check[] = {
309 {"relaxed", 'r'},
310 {"r", 'r'},
311 {"strict", 's'},
312 {"s", 's'},
313 {}
314};
315
316static const struct fs_parameter_spec isofs_param_spec[] = {
317 fsparam_flag ("norock", Opt_norock),
318 fsparam_flag ("nojoliet", Opt_nojoliet),
319 fsparam_flag ("unhide", Opt_unhide),
320 fsparam_flag ("hide", Opt_hide),
321 fsparam_flag ("showassoc", Opt_showassoc),
322 fsparam_flag ("cruft", Opt_cruft),
323 fsparam_flag ("utf8", Opt_utf8),
324 fsparam_string ("iocharset", Opt_iocharset),
325 fsparam_enum ("map", Opt_map, isofs_param_map),
326 fsparam_u32 ("session", Opt_session),
327 fsparam_u32 ("sbsector", Opt_sb),
328 fsparam_enum ("check", Opt_check, isofs_param_check),
329 fsparam_uid ("uid", Opt_uid),
330 fsparam_gid ("gid", Opt_gid),
331 /* Note: mode/dmode historically accepted %u not strictly %o */
332 fsparam_u32 ("mode", Opt_mode),
333 fsparam_u32 ("dmode", Opt_dmode),
334 fsparam_flag ("overriderockperm", Opt_overriderockperm),
335 fsparam_u32 ("block", Opt_block),
336 fsparam_string ("conv", Opt_ignore),
337 fsparam_flag ("nocompress", Opt_nocompress),
338 {}
339};
340
341static int isofs_parse_param(struct fs_context *fc,
342 struct fs_parameter *param)
343{
344 struct isofs_options *popt = fc->fs_private;
345 struct fs_parse_result result;
346 int opt;
347 unsigned int n;
348
349 /* There are no remountable options */
350 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
351 return 0;
352
353 opt = fs_parse(fc, isofs_param_spec, param, &result);
354 if (opt < 0)
355 return opt;
356
357 switch (opt) {
358 case Opt_norock:
359 popt->rock = 0;
360 break;
361 case Opt_nojoliet:
362 popt->joliet = 0;
363 break;
364 case Opt_hide:
365 popt->hide = 1;
366 break;
367 case Opt_unhide:
368 case Opt_showassoc:
369 popt->showassoc = 1;
370 break;
371 case Opt_cruft:
372 popt->cruft = 1;
373 break;
374#ifdef CONFIG_JOLIET
375 case Opt_utf8:
376 kfree(popt->iocharset);
377 popt->iocharset = kstrdup("utf8", GFP_KERNEL);
378 if (!popt->iocharset)
379 return -ENOMEM;
380 break;
381 case Opt_iocharset:
382 kfree(popt->iocharset);
383 popt->iocharset = kstrdup(param->string, GFP_KERNEL);
384 if (!popt->iocharset)
385 return -ENOMEM;
386 break;
387#endif
388 case Opt_map:
389 popt->map = result.uint_32;
390 break;
391 case Opt_session:
392 n = result.uint_32;
393 /*
394 * Track numbers are supposed to be in range 1-99, the
395 * mount option starts indexing at 0.
396 */
397 if (n >= 99)
398 return -EINVAL;
399 popt->session = n + 1;
400 break;
401 case Opt_sb:
402 popt->sbsector = result.uint_32;
403 break;
404 case Opt_check:
405 popt->check = result.uint_32;
406 break;
407 case Opt_ignore:
408 break;
409 case Opt_uid:
410 popt->uid = result.uid;
411 popt->uid_set = 1;
412 break;
413 case Opt_gid:
414 popt->gid = result.gid;
415 popt->gid_set = 1;
416 break;
417 case Opt_mode:
418 popt->fmode = result.uint_32;
419 break;
420 case Opt_dmode:
421 popt->dmode = result.uint_32;
422 break;
423 case Opt_overriderockperm:
424 popt->overriderockperm = 1;
425 break;
426 case Opt_block:
427 n = result.uint_32;
428 if (n != 512 && n != 1024 && n != 2048)
429 return -EINVAL;
430 popt->blocksize = n;
431 break;
432 case Opt_nocompress:
433 popt->nocompress = 1;
434 break;
435 default:
436 return -EINVAL;
437 }
438 return 0;
439}
440
441/*
442 * Display the mount options in /proc/mounts.
443 */
444static int isofs_show_options(struct seq_file *m, struct dentry *root)
445{
446 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
447
448 if (!sbi->s_rock) seq_puts(m, ",norock");
449 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
450 if (sbi->s_cruft) seq_puts(m, ",cruft");
451 if (sbi->s_hide) seq_puts(m, ",hide");
452 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
453 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
454 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
455
456 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
457 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
458 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
459 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
460
461 if (root->d_sb->s_blocksize != 1024)
462 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
463
464 if (sbi->s_uid_set)
465 seq_printf(m, ",uid=%u",
466 from_kuid_munged(&init_user_ns, sbi->s_uid));
467 if (sbi->s_gid_set)
468 seq_printf(m, ",gid=%u",
469 from_kgid_munged(&init_user_ns, sbi->s_gid));
470
471 if (sbi->s_dmode != ISOFS_INVALID_MODE)
472 seq_printf(m, ",dmode=%o", sbi->s_dmode);
473 if (sbi->s_fmode != ISOFS_INVALID_MODE)
474 seq_printf(m, ",fmode=%o", sbi->s_fmode);
475
476#ifdef CONFIG_JOLIET
477 if (sbi->s_nls_iocharset)
478 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
479 else
480 seq_puts(m, ",iocharset=utf8");
481#endif
482 return 0;
483}
484
485/*
486 * look if the driver can tell the multi session redirection value
487 *
488 * don't change this if you don't know what you do, please!
489 * Multisession is legal only with XA disks.
490 * A non-XA disk with more than one volume descriptor may do it right, but
491 * usually is written in a nowhere standardized "multi-partition" manner.
492 * Multisession uses absolute addressing (solely the first frame of the whole
493 * track is #0), multi-partition uses relative addressing (each first frame of
494 * each track is #0), and a track is not a session.
495 *
496 * A broken CDwriter software or drive firmware does not set new standards,
497 * at least not if conflicting with the existing ones.
498 *
499 * emoenke@gwdg.de
500 */
501#define WE_OBEY_THE_WRITTEN_STANDARDS 1
502
503static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
504{
505 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
506 unsigned int vol_desc_start = 0;
507
508 if (session > 0) {
509 struct cdrom_tocentry te;
510
511 if (!cdi)
512 return 0;
513
514 te.cdte_track = session;
515 te.cdte_format = CDROM_LBA;
516 if (cdrom_read_tocentry(cdi, &te) == 0) {
517 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
518 session, te.cdte_addr.lba,
519 te.cdte_ctrl & CDROM_DATA_TRACK);
520 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
521 return te.cdte_addr.lba;
522 }
523
524 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
525 }
526
527 if (cdi) {
528 struct cdrom_multisession ms_info;
529
530 ms_info.addr_format = CDROM_LBA;
531 if (cdrom_multisession(cdi, &ms_info) == 0) {
532#if WE_OBEY_THE_WRITTEN_STANDARDS
533 /* necessary for a valid ms_info.addr */
534 if (ms_info.xa_flag)
535#endif
536 vol_desc_start = ms_info.addr.lba;
537 }
538 }
539
540 return vol_desc_start;
541}
542
543/*
544 * Check if root directory is empty (has less than 3 files).
545 *
546 * Used to detect broken CDs where ISO root directory is empty but Joliet root
547 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
548 * (and Joliet used instead) or else no files would be visible.
549 */
550static bool rootdir_empty(struct super_block *sb, unsigned long block)
551{
552 int offset = 0, files = 0, de_len;
553 struct iso_directory_record *de;
554 struct buffer_head *bh;
555
556 bh = sb_bread(sb, block);
557 if (!bh)
558 return true;
559 while (files < 3) {
560 de = (struct iso_directory_record *) (bh->b_data + offset);
561 de_len = *(unsigned char *) de;
562 if (de_len == 0)
563 break;
564 files++;
565 offset += de_len;
566 }
567 brelse(bh);
568 return files < 3;
569}
570
571/*
572 * Initialize the superblock and read the root inode.
573 */
574static int isofs_fill_super(struct super_block *s, struct fs_context *fc)
575{
576 struct buffer_head *bh = NULL, *pri_bh = NULL;
577 struct hs_primary_descriptor *h_pri = NULL;
578 struct iso_primary_descriptor *pri = NULL;
579 struct iso_supplementary_descriptor *sec = NULL;
580 struct iso_directory_record *rootp;
581 struct inode *inode;
582 struct isofs_options *opt = fc->fs_private;
583 struct isofs_sb_info *sbi;
584 unsigned long first_data_zone;
585 int joliet_level = 0;
586 int iso_blknum, block;
587 int orig_zonesize;
588 int table, error = -EINVAL;
589 unsigned int vol_desc_start;
590 int silent = fc->sb_flags & SB_SILENT;
591
592 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
593 if (!sbi)
594 return -ENOMEM;
595 s->s_fs_info = sbi;
596
597 /*
598 * First of all, get the hardware blocksize for this device.
599 * If we don't know what it is, or the hardware blocksize is
600 * larger than the blocksize the user specified, then use
601 * that value.
602 */
603 /*
604 * What if bugger tells us to go beyond page size?
605 */
606 if (bdev_logical_block_size(s->s_bdev) > 2048) {
607 printk(KERN_WARNING
608 "ISOFS: unsupported/invalid hardware sector size %d\n",
609 bdev_logical_block_size(s->s_bdev));
610 goto out_freesbi;
611 }
612 opt->blocksize = sb_min_blocksize(s, opt->blocksize);
613
614 sbi->s_high_sierra = 0; /* default is iso9660 */
615 sbi->s_session = opt->session;
616 sbi->s_sbsector = opt->sbsector;
617
618 vol_desc_start = (opt->sbsector != -1) ?
619 opt->sbsector : isofs_get_last_session(s, opt->session);
620
621 for (iso_blknum = vol_desc_start+16;
622 iso_blknum < vol_desc_start+100; iso_blknum++) {
623 struct hs_volume_descriptor *hdp;
624 struct iso_volume_descriptor *vdp;
625
626 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
627 if (!(bh = sb_bread(s, block)))
628 goto out_no_read;
629
630 vdp = (struct iso_volume_descriptor *)bh->b_data;
631 hdp = (struct hs_volume_descriptor *)bh->b_data;
632
633 /*
634 * Due to the overlapping physical location of the descriptors,
635 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
636 * proper identification in this case, we first check for ISO.
637 */
638 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
639 if (isonum_711(vdp->type) == ISO_VD_END)
640 break;
641 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
642 if (!pri) {
643 pri = (struct iso_primary_descriptor *)vdp;
644 /* Save the buffer in case we need it ... */
645 pri_bh = bh;
646 bh = NULL;
647 }
648 }
649#ifdef CONFIG_JOLIET
650 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
651 sec = (struct iso_supplementary_descriptor *)vdp;
652 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
653 if (opt->joliet) {
654 if (sec->escape[2] == 0x40)
655 joliet_level = 1;
656 else if (sec->escape[2] == 0x43)
657 joliet_level = 2;
658 else if (sec->escape[2] == 0x45)
659 joliet_level = 3;
660
661 printk(KERN_DEBUG "ISO 9660 Extensions: "
662 "Microsoft Joliet Level %d\n",
663 joliet_level);
664 }
665 goto root_found;
666 } else {
667 /* Unknown supplementary volume descriptor */
668 sec = NULL;
669 }
670 }
671#endif
672 } else {
673 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
674 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
675 goto out_freebh;
676
677 sbi->s_high_sierra = 1;
678 opt->rock = 0;
679 h_pri = (struct hs_primary_descriptor *)vdp;
680 goto root_found;
681 }
682 }
683
684 /* Just skip any volume descriptors we don't recognize */
685
686 brelse(bh);
687 bh = NULL;
688 }
689 /*
690 * If we fall through, either no volume descriptor was found,
691 * or else we passed a primary descriptor looking for others.
692 */
693 if (!pri)
694 goto out_unknown_format;
695 brelse(bh);
696 bh = pri_bh;
697 pri_bh = NULL;
698
699root_found:
700 /* We don't support read-write mounts */
701 if (!sb_rdonly(s)) {
702 error = -EACCES;
703 goto out_freebh;
704 }
705
706 if (joliet_level && (!pri || !opt->rock)) {
707 /* This is the case of Joliet with the norock mount flag.
708 * A disc with both Joliet and Rock Ridge is handled later
709 */
710 pri = (struct iso_primary_descriptor *) sec;
711 }
712
713 if(sbi->s_high_sierra){
714 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
715 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
716 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
717 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
718 } else {
719 if (!pri)
720 goto out_freebh;
721 rootp = (struct iso_directory_record *) pri->root_directory_record;
722 sbi->s_nzones = isonum_733(pri->volume_space_size);
723 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
724 sbi->s_max_size = isonum_733(pri->volume_space_size);
725 }
726
727 sbi->s_ninodes = 0; /* No way to figure this out easily */
728
729 orig_zonesize = sbi->s_log_zone_size;
730 /*
731 * If the zone size is smaller than the hardware sector size,
732 * this is a fatal error. This would occur if the disc drive
733 * had sectors that were 2048 bytes, but the filesystem had
734 * blocks that were 512 bytes (which should only very rarely
735 * happen.)
736 */
737 if (orig_zonesize < opt->blocksize)
738 goto out_bad_size;
739
740 /* RDE: convert log zone size to bit shift */
741 switch (sbi->s_log_zone_size) {
742 case 512: sbi->s_log_zone_size = 9; break;
743 case 1024: sbi->s_log_zone_size = 10; break;
744 case 2048: sbi->s_log_zone_size = 11; break;
745
746 default:
747 goto out_bad_zone_size;
748 }
749
750 s->s_magic = ISOFS_SUPER_MAGIC;
751
752 /*
753 * With multi-extent files, file size is only limited by the maximum
754 * size of a file system, which is 8 TB.
755 */
756 s->s_maxbytes = 0x80000000000LL;
757
758 /* ECMA-119 timestamp from 1900/1/1 with tz offset */
759 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
760 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
761
762 /* Set this for reference. Its not currently used except on write
763 which we don't have .. */
764
765 first_data_zone = isonum_733(rootp->extent) +
766 isonum_711(rootp->ext_attr_length);
767 sbi->s_firstdatazone = first_data_zone;
768#ifndef BEQUIET
769 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
770 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
771 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
772 if(sbi->s_high_sierra)
773 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
774#endif
775
776 /*
777 * If the Joliet level is set, we _may_ decide to use the
778 * secondary descriptor, but can't be sure until after we
779 * read the root inode. But before reading the root inode
780 * we may need to change the device blocksize, and would
781 * rather release the old buffer first. So, we cache the
782 * first_data_zone value from the secondary descriptor.
783 */
784 if (joliet_level) {
785 pri = (struct iso_primary_descriptor *) sec;
786 rootp = (struct iso_directory_record *)
787 pri->root_directory_record;
788 first_data_zone = isonum_733(rootp->extent) +
789 isonum_711(rootp->ext_attr_length);
790 }
791
792 /*
793 * We're all done using the volume descriptor, and may need
794 * to change the device blocksize, so release the buffer now.
795 */
796 brelse(pri_bh);
797 brelse(bh);
798
799 /*
800 * Force the blocksize to 512 for 512 byte sectors. The file
801 * read primitives really get it wrong in a bad way if we don't
802 * do this.
803 *
804 * Note - we should never be setting the blocksize to something
805 * less than the hardware sector size for the device. If we
806 * do, we would end up having to read larger buffers and split
807 * out portions to satisfy requests.
808 *
809 * Note2- the idea here is that we want to deal with the optimal
810 * zonesize in the filesystem. If we have it set to something less,
811 * then we have horrible problems with trying to piece together
812 * bits of adjacent blocks in order to properly read directory
813 * entries. By forcing the blocksize in this way, we ensure
814 * that we will never be required to do this.
815 */
816 sb_set_blocksize(s, orig_zonesize);
817
818 sbi->s_nls_iocharset = NULL;
819
820#ifdef CONFIG_JOLIET
821 if (joliet_level) {
822 char *p = opt->iocharset ? opt->iocharset : CONFIG_NLS_DEFAULT;
823 if (strcmp(p, "utf8") != 0) {
824 sbi->s_nls_iocharset = opt->iocharset ?
825 load_nls(opt->iocharset) : load_nls_default();
826 if (!sbi->s_nls_iocharset)
827 goto out_freesbi;
828 }
829 }
830#endif
831 s->s_op = &isofs_sops;
832 s->s_export_op = &isofs_export_ops;
833 sbi->s_mapping = opt->map;
834 sbi->s_rock = (opt->rock ? 2 : 0);
835 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
836 sbi->s_cruft = opt->cruft;
837 sbi->s_hide = opt->hide;
838 sbi->s_showassoc = opt->showassoc;
839 sbi->s_uid = opt->uid;
840 sbi->s_gid = opt->gid;
841 sbi->s_uid_set = opt->uid_set;
842 sbi->s_gid_set = opt->gid_set;
843 sbi->s_nocompress = opt->nocompress;
844 sbi->s_overriderockperm = opt->overriderockperm;
845 /*
846 * It would be incredibly stupid to allow people to mark every file
847 * on the disk as suid, so we merely allow them to set the default
848 * permissions.
849 */
850 if (opt->fmode != ISOFS_INVALID_MODE)
851 sbi->s_fmode = opt->fmode & 0777;
852 else
853 sbi->s_fmode = ISOFS_INVALID_MODE;
854 if (opt->dmode != ISOFS_INVALID_MODE)
855 sbi->s_dmode = opt->dmode & 0777;
856 else
857 sbi->s_dmode = ISOFS_INVALID_MODE;
858
859 /*
860 * Read the root inode, which _may_ result in changing
861 * the s_rock flag. Once we have the final s_rock value,
862 * we then decide whether to use the Joliet descriptor.
863 */
864 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
865
866 /*
867 * Fix for broken CDs with a corrupt root inode but a correct Joliet
868 * root directory.
869 */
870 if (IS_ERR(inode)) {
871 if (joliet_level && sbi->s_firstdatazone != first_data_zone) {
872 printk(KERN_NOTICE
873 "ISOFS: root inode is unusable. "
874 "Disabling Rock Ridge and switching to Joliet.");
875 sbi->s_rock = 0;
876 inode = NULL;
877 } else {
878 goto out_no_root;
879 }
880 }
881
882 /*
883 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
884 * correct Joliet root directory.
885 */
886 if (sbi->s_rock == 1 && joliet_level &&
887 rootdir_empty(s, sbi->s_firstdatazone)) {
888 printk(KERN_NOTICE
889 "ISOFS: primary root directory is empty. "
890 "Disabling Rock Ridge and switching to Joliet.");
891 sbi->s_rock = 0;
892 }
893
894 /*
895 * If this disk has both Rock Ridge and Joliet on it, then we
896 * want to use Rock Ridge by default. This can be overridden
897 * by using the norock mount option. There is still one other
898 * possibility that is not taken into account: a Rock Ridge
899 * CD with Unicode names. Until someone sees such a beast, it
900 * will not be supported.
901 */
902 if (sbi->s_rock == 1) {
903 joliet_level = 0;
904 } else if (joliet_level) {
905 sbi->s_rock = 0;
906 if (sbi->s_firstdatazone != first_data_zone) {
907 sbi->s_firstdatazone = first_data_zone;
908 printk(KERN_DEBUG
909 "ISOFS: changing to secondary root\n");
910 iput(inode);
911 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
912 if (IS_ERR(inode))
913 goto out_no_root;
914 }
915 }
916
917 if (opt->check == 'u') {
918 /* Only Joliet is case insensitive by default */
919 if (joliet_level)
920 opt->check = 'r';
921 else
922 opt->check = 's';
923 }
924 sbi->s_joliet_level = joliet_level;
925
926 /* Make sure the root inode is a directory */
927 if (!S_ISDIR(inode->i_mode)) {
928 printk(KERN_WARNING
929 "isofs_fill_super: root inode is not a directory. "
930 "Corrupted media?\n");
931 goto out_iput;
932 }
933
934 table = 0;
935 if (joliet_level)
936 table += 2;
937 if (opt->check == 'r')
938 table++;
939 sbi->s_check = opt->check;
940
941 if (table)
942 s->s_d_op = &isofs_dentry_ops[table - 1];
943
944 /* get the root dentry */
945 s->s_root = d_make_root(inode);
946 if (!(s->s_root)) {
947 error = -ENOMEM;
948 goto out_no_inode;
949 }
950
951 return 0;
952
953 /*
954 * Display error messages and free resources.
955 */
956out_iput:
957 iput(inode);
958 goto out_no_inode;
959out_no_root:
960 error = PTR_ERR(inode);
961 if (error != -ENOMEM)
962 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
963out_no_inode:
964#ifdef CONFIG_JOLIET
965 unload_nls(sbi->s_nls_iocharset);
966#endif
967 goto out_freesbi;
968out_no_read:
969 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
970 __func__, s->s_id, iso_blknum, block);
971 goto out_freebh;
972out_bad_zone_size:
973 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
974 sbi->s_log_zone_size);
975 goto out_freebh;
976out_bad_size:
977 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
978 orig_zonesize, opt->blocksize);
979 goto out_freebh;
980out_unknown_format:
981 if (!silent)
982 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
983
984out_freebh:
985 brelse(bh);
986 brelse(pri_bh);
987out_freesbi:
988 kfree(sbi);
989 s->s_fs_info = NULL;
990 return error;
991}
992
993static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
994{
995 struct super_block *sb = dentry->d_sb;
996 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
997
998 buf->f_type = ISOFS_SUPER_MAGIC;
999 buf->f_bsize = sb->s_blocksize;
1000 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1001 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1002 buf->f_bfree = 0;
1003 buf->f_bavail = 0;
1004 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1005 buf->f_ffree = 0;
1006 buf->f_fsid = u64_to_fsid(id);
1007 buf->f_namelen = NAME_MAX;
1008 return 0;
1009}
1010
1011/*
1012 * Get a set of blocks; filling in buffer_heads if already allocated
1013 * or getblk() if they are not. Returns the number of blocks inserted
1014 * (-ve == error.)
1015 */
1016int isofs_get_blocks(struct inode *inode, sector_t iblock,
1017 struct buffer_head **bh, unsigned long nblocks)
1018{
1019 unsigned long b_off = iblock;
1020 unsigned offset, sect_size;
1021 unsigned int firstext;
1022 unsigned long nextblk, nextoff;
1023 int section, rv, error;
1024 struct iso_inode_info *ei = ISOFS_I(inode);
1025
1026 error = -EIO;
1027 rv = 0;
1028 if (iblock != b_off) {
1029 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1030 goto abort;
1031 }
1032
1033
1034 offset = 0;
1035 firstext = ei->i_first_extent;
1036 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1037 nextblk = ei->i_next_section_block;
1038 nextoff = ei->i_next_section_offset;
1039 section = 0;
1040
1041 while (nblocks) {
1042 /* If we are *way* beyond the end of the file, print a message.
1043 * Access beyond the end of the file up to the next page boundary
1044 * is normal, however because of the way the page cache works.
1045 * In this case, we just return 0 so that we can properly fill
1046 * the page with useless information without generating any
1047 * I/O errors.
1048 */
1049 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1050 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1051 __func__, b_off,
1052 (unsigned long long)inode->i_size);
1053 goto abort;
1054 }
1055
1056 /* On the last section, nextblk == 0, section size is likely to
1057 * exceed sect_size by a partial block, and access beyond the
1058 * end of the file will reach beyond the section size, too.
1059 */
1060 while (nextblk && (b_off >= (offset + sect_size))) {
1061 struct inode *ninode;
1062
1063 offset += sect_size;
1064 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1065 if (IS_ERR(ninode)) {
1066 error = PTR_ERR(ninode);
1067 goto abort;
1068 }
1069 firstext = ISOFS_I(ninode)->i_first_extent;
1070 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1071 nextblk = ISOFS_I(ninode)->i_next_section_block;
1072 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1073 iput(ninode);
1074
1075 if (++section > 100) {
1076 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1077 " aborting...\n", __func__);
1078 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1079 "nextblk=%lu nextoff=%lu\n", __func__,
1080 b_off, firstext, (unsigned) sect_size,
1081 nextblk, nextoff);
1082 goto abort;
1083 }
1084 }
1085
1086 if (*bh) {
1087 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1088 } else {
1089 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1090 if (!*bh)
1091 goto abort;
1092 }
1093 bh++; /* Next buffer head */
1094 b_off++; /* Next buffer offset */
1095 nblocks--;
1096 rv++;
1097 }
1098
1099 error = 0;
1100abort:
1101 return rv != 0 ? rv : error;
1102}
1103
1104/*
1105 * Used by the standard interfaces.
1106 */
1107static int isofs_get_block(struct inode *inode, sector_t iblock,
1108 struct buffer_head *bh_result, int create)
1109{
1110 int ret;
1111
1112 if (create) {
1113 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1114 return -EROFS;
1115 }
1116
1117 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1118 return ret < 0 ? ret : 0;
1119}
1120
1121static int isofs_bmap(struct inode *inode, sector_t block)
1122{
1123 struct buffer_head dummy;
1124 int error;
1125
1126 dummy.b_state = 0;
1127 dummy.b_blocknr = -1000;
1128 error = isofs_get_block(inode, block, &dummy, 0);
1129 if (!error)
1130 return dummy.b_blocknr;
1131 return 0;
1132}
1133
1134struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1135{
1136 sector_t blknr = isofs_bmap(inode, block);
1137 if (!blknr)
1138 return NULL;
1139 return sb_bread(inode->i_sb, blknr);
1140}
1141
1142static int isofs_read_folio(struct file *file, struct folio *folio)
1143{
1144 return mpage_read_folio(folio, isofs_get_block);
1145}
1146
1147static void isofs_readahead(struct readahead_control *rac)
1148{
1149 mpage_readahead(rac, isofs_get_block);
1150}
1151
1152static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1153{
1154 return generic_block_bmap(mapping,block,isofs_get_block);
1155}
1156
1157static const struct address_space_operations isofs_aops = {
1158 .read_folio = isofs_read_folio,
1159 .readahead = isofs_readahead,
1160 .bmap = _isofs_bmap
1161};
1162
1163static int isofs_read_level3_size(struct inode *inode)
1164{
1165 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1166 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1167 struct buffer_head *bh = NULL;
1168 unsigned long block, offset, block_saved, offset_saved;
1169 int i = 0;
1170 int more_entries = 0;
1171 struct iso_directory_record *tmpde = NULL;
1172 struct iso_inode_info *ei = ISOFS_I(inode);
1173
1174 inode->i_size = 0;
1175
1176 /* The first 16 blocks are reserved as the System Area. Thus,
1177 * no inodes can appear in block 0. We use this to flag that
1178 * this is the last section. */
1179 ei->i_next_section_block = 0;
1180 ei->i_next_section_offset = 0;
1181
1182 block = ei->i_iget5_block;
1183 offset = ei->i_iget5_offset;
1184
1185 do {
1186 struct iso_directory_record *de;
1187 unsigned int de_len;
1188
1189 if (!bh) {
1190 bh = sb_bread(inode->i_sb, block);
1191 if (!bh)
1192 goto out_noread;
1193 }
1194 de = (struct iso_directory_record *) (bh->b_data + offset);
1195 de_len = *(unsigned char *) de;
1196
1197 if (de_len == 0) {
1198 brelse(bh);
1199 bh = NULL;
1200 ++block;
1201 offset = 0;
1202 continue;
1203 }
1204
1205 block_saved = block;
1206 offset_saved = offset;
1207 offset += de_len;
1208
1209 /* Make sure we have a full directory entry */
1210 if (offset >= bufsize) {
1211 int slop = bufsize - offset + de_len;
1212 if (!tmpde) {
1213 tmpde = kmalloc(256, GFP_KERNEL);
1214 if (!tmpde)
1215 goto out_nomem;
1216 }
1217 memcpy(tmpde, de, slop);
1218 offset &= bufsize - 1;
1219 block++;
1220 brelse(bh);
1221 bh = NULL;
1222 if (offset) {
1223 bh = sb_bread(inode->i_sb, block);
1224 if (!bh)
1225 goto out_noread;
1226 memcpy((void *)tmpde+slop, bh->b_data, offset);
1227 }
1228 de = tmpde;
1229 }
1230
1231 inode->i_size += isonum_733(de->size);
1232 if (i == 1) {
1233 ei->i_next_section_block = block_saved;
1234 ei->i_next_section_offset = offset_saved;
1235 }
1236
1237 more_entries = de->flags[-high_sierra] & 0x80;
1238
1239 i++;
1240 if (i > 100)
1241 goto out_toomany;
1242 } while (more_entries);
1243out:
1244 kfree(tmpde);
1245 brelse(bh);
1246 return 0;
1247
1248out_nomem:
1249 brelse(bh);
1250 return -ENOMEM;
1251
1252out_noread:
1253 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1254 kfree(tmpde);
1255 return -EIO;
1256
1257out_toomany:
1258 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1259 "isofs_read_level3_size: inode=%lu\n",
1260 __func__, inode->i_ino);
1261 goto out;
1262}
1263
1264static int isofs_read_inode(struct inode *inode, int relocated)
1265{
1266 struct super_block *sb = inode->i_sb;
1267 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1268 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1269 unsigned long block;
1270 int high_sierra = sbi->s_high_sierra;
1271 struct buffer_head *bh;
1272 struct iso_directory_record *de;
1273 struct iso_directory_record *tmpde = NULL;
1274 unsigned int de_len;
1275 unsigned long offset;
1276 struct iso_inode_info *ei = ISOFS_I(inode);
1277 int ret = -EIO;
1278
1279 block = ei->i_iget5_block;
1280 bh = sb_bread(inode->i_sb, block);
1281 if (!bh)
1282 goto out_badread;
1283
1284 offset = ei->i_iget5_offset;
1285
1286 de = (struct iso_directory_record *) (bh->b_data + offset);
1287 de_len = *(unsigned char *) de;
1288 if (de_len < sizeof(struct iso_directory_record))
1289 goto fail;
1290
1291 if (offset + de_len > bufsize) {
1292 int frag1 = bufsize - offset;
1293
1294 tmpde = kmalloc(de_len, GFP_KERNEL);
1295 if (!tmpde) {
1296 ret = -ENOMEM;
1297 goto fail;
1298 }
1299 memcpy(tmpde, bh->b_data + offset, frag1);
1300 brelse(bh);
1301 bh = sb_bread(inode->i_sb, ++block);
1302 if (!bh)
1303 goto out_badread;
1304 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1305 de = tmpde;
1306 }
1307
1308 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1309 ei->i_iget5_offset,
1310 ISOFS_BUFFER_BITS(inode));
1311
1312 /* Assume it is a normal-format file unless told otherwise */
1313 ei->i_file_format = isofs_file_normal;
1314
1315 if (de->flags[-high_sierra] & 2) {
1316 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1317 inode->i_mode = S_IFDIR | sbi->s_dmode;
1318 else
1319 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1320 set_nlink(inode, 1); /*
1321 * Set to 1. We know there are 2, but
1322 * the find utility tries to optimize
1323 * if it is 2, and it screws up. It is
1324 * easier to give 1 which tells find to
1325 * do it the hard way.
1326 */
1327 } else {
1328 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1329 inode->i_mode = S_IFREG | sbi->s_fmode;
1330 } else {
1331 /*
1332 * Set default permissions: r-x for all. The disc
1333 * could be shared with DOS machines so virtually
1334 * anything could be a valid executable.
1335 */
1336 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1337 }
1338 set_nlink(inode, 1);
1339 }
1340 inode->i_uid = sbi->s_uid;
1341 inode->i_gid = sbi->s_gid;
1342 inode->i_blocks = 0;
1343
1344 ei->i_format_parm[0] = 0;
1345 ei->i_format_parm[1] = 0;
1346 ei->i_format_parm[2] = 0;
1347
1348 ei->i_section_size = isonum_733(de->size);
1349 if (de->flags[-high_sierra] & 0x80) {
1350 ret = isofs_read_level3_size(inode);
1351 if (ret < 0)
1352 goto fail;
1353 ret = -EIO;
1354 } else {
1355 ei->i_next_section_block = 0;
1356 ei->i_next_section_offset = 0;
1357 inode->i_size = isonum_733(de->size);
1358 }
1359
1360 /*
1361 * Some dipshit decided to store some other bit of information
1362 * in the high byte of the file length. Truncate size in case
1363 * this CDROM was mounted with the cruft option.
1364 */
1365
1366 if (sbi->s_cruft)
1367 inode->i_size &= 0x00ffffff;
1368
1369 if (de->interleave[0]) {
1370 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1371 inode->i_size = 0;
1372 }
1373
1374 /* I have no idea what file_unit_size is used for, so
1375 we will flag it for now */
1376 if (de->file_unit_size[0] != 0) {
1377 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1378 inode->i_ino);
1379 }
1380
1381 /* I have no idea what other flag bits are used for, so
1382 we will flag it for now */
1383#ifdef DEBUG
1384 if((de->flags[-high_sierra] & ~2)!= 0){
1385 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1386 "(%ld %x).\n",
1387 inode->i_ino, de->flags[-high_sierra]);
1388 }
1389#endif
1390 inode_set_mtime_to_ts(inode,
1391 inode_set_atime_to_ts(inode, inode_set_ctime(inode, iso_date(de->date, high_sierra), 0)));
1392
1393 ei->i_first_extent = (isonum_733(de->extent) +
1394 isonum_711(de->ext_attr_length));
1395
1396 /* Set the number of blocks for stat() - should be done before RR */
1397 inode->i_blocks = (inode->i_size + 511) >> 9;
1398
1399 /*
1400 * Now test for possible Rock Ridge extensions which will override
1401 * some of these numbers in the inode structure.
1402 */
1403
1404 if (!high_sierra) {
1405 parse_rock_ridge_inode(de, inode, relocated);
1406 /* if we want uid/gid set, override the rock ridge setting */
1407 if (sbi->s_uid_set)
1408 inode->i_uid = sbi->s_uid;
1409 if (sbi->s_gid_set)
1410 inode->i_gid = sbi->s_gid;
1411 }
1412 /* Now set final access rights if overriding rock ridge setting */
1413 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1414 sbi->s_dmode != ISOFS_INVALID_MODE)
1415 inode->i_mode = S_IFDIR | sbi->s_dmode;
1416 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1417 sbi->s_fmode != ISOFS_INVALID_MODE)
1418 inode->i_mode = S_IFREG | sbi->s_fmode;
1419
1420 /* Install the inode operations vector */
1421 if (S_ISREG(inode->i_mode)) {
1422 inode->i_fop = &generic_ro_fops;
1423 switch (ei->i_file_format) {
1424#ifdef CONFIG_ZISOFS
1425 case isofs_file_compressed:
1426 inode->i_data.a_ops = &zisofs_aops;
1427 break;
1428#endif
1429 default:
1430 inode->i_data.a_ops = &isofs_aops;
1431 break;
1432 }
1433 } else if (S_ISDIR(inode->i_mode)) {
1434 inode->i_op = &isofs_dir_inode_operations;
1435 inode->i_fop = &isofs_dir_operations;
1436 } else if (S_ISLNK(inode->i_mode)) {
1437 inode->i_op = &page_symlink_inode_operations;
1438 inode_nohighmem(inode);
1439 inode->i_data.a_ops = &isofs_symlink_aops;
1440 } else
1441 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1442 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1443
1444 ret = 0;
1445out:
1446 kfree(tmpde);
1447 brelse(bh);
1448 return ret;
1449
1450out_badread:
1451 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1452fail:
1453 goto out;
1454}
1455
1456struct isofs_iget5_callback_data {
1457 unsigned long block;
1458 unsigned long offset;
1459};
1460
1461static int isofs_iget5_test(struct inode *ino, void *data)
1462{
1463 struct iso_inode_info *i = ISOFS_I(ino);
1464 struct isofs_iget5_callback_data *d =
1465 (struct isofs_iget5_callback_data*)data;
1466 return (i->i_iget5_block == d->block)
1467 && (i->i_iget5_offset == d->offset);
1468}
1469
1470static int isofs_iget5_set(struct inode *ino, void *data)
1471{
1472 struct iso_inode_info *i = ISOFS_I(ino);
1473 struct isofs_iget5_callback_data *d =
1474 (struct isofs_iget5_callback_data*)data;
1475 i->i_iget5_block = d->block;
1476 i->i_iget5_offset = d->offset;
1477 return 0;
1478}
1479
1480/* Store, in the inode's containing structure, the block and block
1481 * offset that point to the underlying meta-data for the inode. The
1482 * code below is otherwise similar to the iget() code in
1483 * include/linux/fs.h */
1484struct inode *__isofs_iget(struct super_block *sb,
1485 unsigned long block,
1486 unsigned long offset,
1487 int relocated)
1488{
1489 unsigned long hashval;
1490 struct inode *inode;
1491 struct isofs_iget5_callback_data data;
1492 long ret;
1493
1494 if (offset >= 1ul << sb->s_blocksize_bits)
1495 return ERR_PTR(-EINVAL);
1496
1497 data.block = block;
1498 data.offset = offset;
1499
1500 hashval = (block << sb->s_blocksize_bits) | offset;
1501
1502 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1503 &isofs_iget5_set, &data);
1504
1505 if (!inode)
1506 return ERR_PTR(-ENOMEM);
1507
1508 if (inode->i_state & I_NEW) {
1509 ret = isofs_read_inode(inode, relocated);
1510 if (ret < 0) {
1511 iget_failed(inode);
1512 inode = ERR_PTR(ret);
1513 } else {
1514 unlock_new_inode(inode);
1515 }
1516 }
1517
1518 return inode;
1519}
1520
1521static int isofs_get_tree(struct fs_context *fc)
1522{
1523 return get_tree_bdev(fc, isofs_fill_super);
1524}
1525
1526static void isofs_free_fc(struct fs_context *fc)
1527{
1528 struct isofs_options *opt = fc->fs_private;
1529
1530 kfree(opt->iocharset);
1531 kfree(opt);
1532}
1533
1534static const struct fs_context_operations isofs_context_ops = {
1535 .parse_param = isofs_parse_param,
1536 .get_tree = isofs_get_tree,
1537 .reconfigure = isofs_reconfigure,
1538 .free = isofs_free_fc,
1539};
1540
1541static int isofs_init_fs_context(struct fs_context *fc)
1542{
1543 struct isofs_options *opt;
1544
1545 opt = kzalloc(sizeof(*opt), GFP_KERNEL);
1546 if (!opt)
1547 return -ENOMEM;
1548
1549 opt->map = 'n';
1550 opt->rock = 1;
1551 opt->joliet = 1;
1552 opt->cruft = 0;
1553 opt->hide = 0;
1554 opt->showassoc = 0;
1555 opt->check = 'u'; /* unset */
1556 opt->nocompress = 0;
1557 opt->blocksize = 1024;
1558 opt->fmode = opt->dmode = ISOFS_INVALID_MODE;
1559 opt->uid_set = 0;
1560 opt->gid_set = 0;
1561 opt->gid = GLOBAL_ROOT_GID;
1562 opt->uid = GLOBAL_ROOT_UID;
1563 opt->iocharset = NULL;
1564 opt->overriderockperm = 0;
1565 opt->session = -1;
1566 opt->sbsector = -1;
1567
1568 fc->fs_private = opt;
1569 fc->ops = &isofs_context_ops;
1570
1571 return 0;
1572}
1573
1574static struct file_system_type iso9660_fs_type = {
1575 .owner = THIS_MODULE,
1576 .name = "iso9660",
1577 .kill_sb = kill_block_super,
1578 .fs_flags = FS_REQUIRES_DEV,
1579 .init_fs_context = isofs_init_fs_context,
1580 .parameters = isofs_param_spec,
1581};
1582MODULE_ALIAS_FS("iso9660");
1583MODULE_ALIAS("iso9660");
1584
1585static int __init init_iso9660_fs(void)
1586{
1587 int err = init_inodecache();
1588 if (err)
1589 goto out;
1590#ifdef CONFIG_ZISOFS
1591 err = zisofs_init();
1592 if (err)
1593 goto out1;
1594#endif
1595 err = register_filesystem(&iso9660_fs_type);
1596 if (err)
1597 goto out2;
1598 return 0;
1599out2:
1600#ifdef CONFIG_ZISOFS
1601 zisofs_cleanup();
1602out1:
1603#endif
1604 destroy_inodecache();
1605out:
1606 return err;
1607}
1608
1609static void __exit exit_iso9660_fs(void)
1610{
1611 unregister_filesystem(&iso9660_fs_type);
1612#ifdef CONFIG_ZISOFS
1613 zisofs_cleanup();
1614#endif
1615 destroy_inodecache();
1616}
1617
1618module_init(init_iso9660_fs)
1619module_exit(exit_iso9660_fs)
1620MODULE_DESCRIPTION("ISO 9660 CDROM file system support");
1621MODULE_LICENSE("GPL");