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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_dentry_cmpi(const struct dentry *dentry,
33 unsigned int len, const char *str, const struct qstr *name);
34
35#ifdef CONFIG_JOLIET
36static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
37static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
38static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
39 unsigned int len, const char *str, const struct qstr *name);
40static int isofs_dentry_cmp_ms(const struct dentry *dentry,
41 unsigned int len, const char *str, const struct qstr *name);
42#endif
43
44static void isofs_put_super(struct super_block *sb)
45{
46 struct isofs_sb_info *sbi = ISOFS_SB(sb);
47
48#ifdef CONFIG_JOLIET
49 unload_nls(sbi->s_nls_iocharset);
50#endif
51
52 kfree(sbi);
53 sb->s_fs_info = NULL;
54 return;
55}
56
57static int isofs_read_inode(struct inode *, int relocated);
58static int isofs_statfs (struct dentry *, struct kstatfs *);
59
60static struct kmem_cache *isofs_inode_cachep;
61
62static struct inode *isofs_alloc_inode(struct super_block *sb)
63{
64 struct iso_inode_info *ei;
65 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
66 if (!ei)
67 return NULL;
68 return &ei->vfs_inode;
69}
70
71static void isofs_i_callback(struct rcu_head *head)
72{
73 struct inode *inode = container_of(head, struct inode, i_rcu);
74 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
75}
76
77static void isofs_destroy_inode(struct inode *inode)
78{
79 call_rcu(&inode->i_rcu, isofs_i_callback);
80}
81
82static void init_once(void *foo)
83{
84 struct iso_inode_info *ei = foo;
85
86 inode_init_once(&ei->vfs_inode);
87}
88
89static int __init init_inodecache(void)
90{
91 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
92 sizeof(struct iso_inode_info),
93 0, (SLAB_RECLAIM_ACCOUNT|
94 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
95 init_once);
96 if (isofs_inode_cachep == NULL)
97 return -ENOMEM;
98 return 0;
99}
100
101static void destroy_inodecache(void)
102{
103 /*
104 * Make sure all delayed rcu free inodes are flushed before we
105 * destroy cache.
106 */
107 rcu_barrier();
108 kmem_cache_destroy(isofs_inode_cachep);
109}
110
111static int isofs_remount(struct super_block *sb, int *flags, char *data)
112{
113 sync_filesystem(sb);
114 if (!(*flags & MS_RDONLY))
115 return -EROFS;
116 return 0;
117}
118
119static const struct super_operations isofs_sops = {
120 .alloc_inode = isofs_alloc_inode,
121 .destroy_inode = isofs_destroy_inode,
122 .put_super = isofs_put_super,
123 .statfs = isofs_statfs,
124 .remount_fs = isofs_remount,
125 .show_options = generic_show_options,
126};
127
128
129static const struct dentry_operations isofs_dentry_ops[] = {
130 {
131 .d_hash = isofs_hashi,
132 .d_compare = isofs_dentry_cmpi,
133 },
134#ifdef CONFIG_JOLIET
135 {
136 .d_hash = isofs_hash_ms,
137 .d_compare = isofs_dentry_cmp_ms,
138 },
139 {
140 .d_hash = isofs_hashi_ms,
141 .d_compare = isofs_dentry_cmpi_ms,
142 },
143#endif
144};
145
146struct iso9660_options{
147 unsigned int rock:1;
148 unsigned int joliet:1;
149 unsigned int cruft:1;
150 unsigned int hide:1;
151 unsigned int showassoc:1;
152 unsigned int nocompress:1;
153 unsigned int overriderockperm:1;
154 unsigned int uid_set:1;
155 unsigned int gid_set:1;
156 unsigned int utf8:1;
157 unsigned char map;
158 unsigned char check;
159 unsigned int blocksize;
160 umode_t fmode;
161 umode_t dmode;
162 kgid_t gid;
163 kuid_t uid;
164 char *iocharset;
165 /* LVE */
166 s32 session;
167 s32 sbsector;
168};
169
170/*
171 * Compute the hash for the isofs name corresponding to the dentry.
172 */
173static int
174isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
175{
176 const char *name;
177 int len;
178 char c;
179 unsigned long hash;
180
181 len = qstr->len;
182 name = qstr->name;
183 if (ms) {
184 while (len && name[len-1] == '.')
185 len--;
186 }
187
188 hash = init_name_hash(dentry);
189 while (len--) {
190 c = tolower(*name++);
191 hash = partial_name_hash(c, hash);
192 }
193 qstr->hash = end_name_hash(hash);
194
195 return 0;
196}
197
198/*
199 * Compare of two isofs names.
200 */
201static int isofs_dentry_cmp_common(
202 unsigned int len, const char *str,
203 const struct qstr *name, int ms, int ci)
204{
205 int alen, blen;
206
207 /* A filename cannot end in '.' or we treat it like it has none */
208 alen = name->len;
209 blen = len;
210 if (ms) {
211 while (alen && name->name[alen-1] == '.')
212 alen--;
213 while (blen && str[blen-1] == '.')
214 blen--;
215 }
216 if (alen == blen) {
217 if (ci) {
218 if (strncasecmp(name->name, str, alen) == 0)
219 return 0;
220 } else {
221 if (strncmp(name->name, str, alen) == 0)
222 return 0;
223 }
224 }
225 return 1;
226}
227
228static int
229isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
230{
231 return isofs_hashi_common(dentry, qstr, 0);
232}
233
234static int
235isofs_dentry_cmpi(const struct dentry *dentry,
236 unsigned int len, const char *str, const struct qstr *name)
237{
238 return isofs_dentry_cmp_common(len, str, name, 0, 1);
239}
240
241#ifdef CONFIG_JOLIET
242/*
243 * Compute the hash for the isofs name corresponding to the dentry.
244 */
245static int
246isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
247{
248 const char *name;
249 int len;
250
251 len = qstr->len;
252 name = qstr->name;
253 if (ms) {
254 while (len && name[len-1] == '.')
255 len--;
256 }
257
258 qstr->hash = full_name_hash(dentry, name, len);
259
260 return 0;
261}
262
263static int
264isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
265{
266 return isofs_hash_common(dentry, qstr, 1);
267}
268
269static int
270isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
271{
272 return isofs_hashi_common(dentry, qstr, 1);
273}
274
275static int
276isofs_dentry_cmp_ms(const struct dentry *dentry,
277 unsigned int len, const char *str, const struct qstr *name)
278{
279 return isofs_dentry_cmp_common(len, str, name, 1, 0);
280}
281
282static int
283isofs_dentry_cmpi_ms(const struct dentry *dentry,
284 unsigned int len, const char *str, const struct qstr *name)
285{
286 return isofs_dentry_cmp_common(len, str, name, 1, 1);
287}
288#endif
289
290enum {
291 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
292 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
293 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
294 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
295};
296
297static const match_table_t tokens = {
298 {Opt_norock, "norock"},
299 {Opt_nojoliet, "nojoliet"},
300 {Opt_unhide, "unhide"},
301 {Opt_hide, "hide"},
302 {Opt_showassoc, "showassoc"},
303 {Opt_cruft, "cruft"},
304 {Opt_utf8, "utf8"},
305 {Opt_iocharset, "iocharset=%s"},
306 {Opt_map_a, "map=acorn"},
307 {Opt_map_a, "map=a"},
308 {Opt_map_n, "map=normal"},
309 {Opt_map_n, "map=n"},
310 {Opt_map_o, "map=off"},
311 {Opt_map_o, "map=o"},
312 {Opt_session, "session=%u"},
313 {Opt_sb, "sbsector=%u"},
314 {Opt_check_r, "check=relaxed"},
315 {Opt_check_r, "check=r"},
316 {Opt_check_s, "check=strict"},
317 {Opt_check_s, "check=s"},
318 {Opt_uid, "uid=%u"},
319 {Opt_gid, "gid=%u"},
320 {Opt_mode, "mode=%u"},
321 {Opt_dmode, "dmode=%u"},
322 {Opt_overriderockperm, "overriderockperm"},
323 {Opt_block, "block=%u"},
324 {Opt_ignore, "conv=binary"},
325 {Opt_ignore, "conv=b"},
326 {Opt_ignore, "conv=text"},
327 {Opt_ignore, "conv=t"},
328 {Opt_ignore, "conv=mtext"},
329 {Opt_ignore, "conv=m"},
330 {Opt_ignore, "conv=auto"},
331 {Opt_ignore, "conv=a"},
332 {Opt_nocompress, "nocompress"},
333 {Opt_err, NULL}
334};
335
336static int parse_options(char *options, struct iso9660_options *popt)
337{
338 char *p;
339 int option;
340
341 popt->map = 'n';
342 popt->rock = 1;
343 popt->joliet = 1;
344 popt->cruft = 0;
345 popt->hide = 0;
346 popt->showassoc = 0;
347 popt->check = 'u'; /* unset */
348 popt->nocompress = 0;
349 popt->blocksize = 1024;
350 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
351 popt->uid_set = 0;
352 popt->gid_set = 0;
353 popt->gid = GLOBAL_ROOT_GID;
354 popt->uid = GLOBAL_ROOT_UID;
355 popt->iocharset = NULL;
356 popt->utf8 = 0;
357 popt->overriderockperm = 0;
358 popt->session=-1;
359 popt->sbsector=-1;
360 if (!options)
361 return 1;
362
363 while ((p = strsep(&options, ",")) != NULL) {
364 int token;
365 substring_t args[MAX_OPT_ARGS];
366 unsigned n;
367
368 if (!*p)
369 continue;
370
371 token = match_token(p, tokens, args);
372 switch (token) {
373 case Opt_norock:
374 popt->rock = 0;
375 break;
376 case Opt_nojoliet:
377 popt->joliet = 0;
378 break;
379 case Opt_hide:
380 popt->hide = 1;
381 break;
382 case Opt_unhide:
383 case Opt_showassoc:
384 popt->showassoc = 1;
385 break;
386 case Opt_cruft:
387 popt->cruft = 1;
388 break;
389 case Opt_utf8:
390 popt->utf8 = 1;
391 break;
392#ifdef CONFIG_JOLIET
393 case Opt_iocharset:
394 popt->iocharset = match_strdup(&args[0]);
395 break;
396#endif
397 case Opt_map_a:
398 popt->map = 'a';
399 break;
400 case Opt_map_o:
401 popt->map = 'o';
402 break;
403 case Opt_map_n:
404 popt->map = 'n';
405 break;
406 case Opt_session:
407 if (match_int(&args[0], &option))
408 return 0;
409 n = option;
410 if (n > 99)
411 return 0;
412 popt->session = n + 1;
413 break;
414 case Opt_sb:
415 if (match_int(&args[0], &option))
416 return 0;
417 popt->sbsector = option;
418 break;
419 case Opt_check_r:
420 popt->check = 'r';
421 break;
422 case Opt_check_s:
423 popt->check = 's';
424 break;
425 case Opt_ignore:
426 break;
427 case Opt_uid:
428 if (match_int(&args[0], &option))
429 return 0;
430 popt->uid = make_kuid(current_user_ns(), option);
431 if (!uid_valid(popt->uid))
432 return 0;
433 popt->uid_set = 1;
434 break;
435 case Opt_gid:
436 if (match_int(&args[0], &option))
437 return 0;
438 popt->gid = make_kgid(current_user_ns(), option);
439 if (!gid_valid(popt->gid))
440 return 0;
441 popt->gid_set = 1;
442 break;
443 case Opt_mode:
444 if (match_int(&args[0], &option))
445 return 0;
446 popt->fmode = option;
447 break;
448 case Opt_dmode:
449 if (match_int(&args[0], &option))
450 return 0;
451 popt->dmode = option;
452 break;
453 case Opt_overriderockperm:
454 popt->overriderockperm = 1;
455 break;
456 case Opt_block:
457 if (match_int(&args[0], &option))
458 return 0;
459 n = option;
460 if (n != 512 && n != 1024 && n != 2048)
461 return 0;
462 popt->blocksize = n;
463 break;
464 case Opt_nocompress:
465 popt->nocompress = 1;
466 break;
467 default:
468 return 0;
469 }
470 }
471 return 1;
472}
473
474/*
475 * look if the driver can tell the multi session redirection value
476 *
477 * don't change this if you don't know what you do, please!
478 * Multisession is legal only with XA disks.
479 * A non-XA disk with more than one volume descriptor may do it right, but
480 * usually is written in a nowhere standardized "multi-partition" manner.
481 * Multisession uses absolute addressing (solely the first frame of the whole
482 * track is #0), multi-partition uses relative addressing (each first frame of
483 * each track is #0), and a track is not a session.
484 *
485 * A broken CDwriter software or drive firmware does not set new standards,
486 * at least not if conflicting with the existing ones.
487 *
488 * emoenke@gwdg.de
489 */
490#define WE_OBEY_THE_WRITTEN_STANDARDS 1
491
492static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
493{
494 struct cdrom_multisession ms_info;
495 unsigned int vol_desc_start;
496 struct block_device *bdev = sb->s_bdev;
497 int i;
498
499 vol_desc_start=0;
500 ms_info.addr_format=CDROM_LBA;
501 if(session >= 0 && session <= 99) {
502 struct cdrom_tocentry Te;
503 Te.cdte_track=session;
504 Te.cdte_format=CDROM_LBA;
505 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
506 if (!i) {
507 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
508 session, Te.cdte_addr.lba,
509 Te.cdte_ctrl&CDROM_DATA_TRACK);
510 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
511 return Te.cdte_addr.lba;
512 }
513
514 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
515 }
516 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
517 if (session > 0)
518 printk(KERN_ERR "ISOFS: Invalid session number\n");
519#if 0
520 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
521 if (i==0) {
522 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
523 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
524 }
525#endif
526 if (i==0)
527#if WE_OBEY_THE_WRITTEN_STANDARDS
528 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
529#endif
530 vol_desc_start=ms_info.addr.lba;
531 return vol_desc_start;
532}
533
534/*
535 * Check if root directory is empty (has less than 3 files).
536 *
537 * Used to detect broken CDs where ISO root directory is empty but Joliet root
538 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
539 * (and Joliet used instead) or else no files would be visible.
540 */
541static bool rootdir_empty(struct super_block *sb, unsigned long block)
542{
543 int offset = 0, files = 0, de_len;
544 struct iso_directory_record *de;
545 struct buffer_head *bh;
546
547 bh = sb_bread(sb, block);
548 if (!bh)
549 return true;
550 while (files < 3) {
551 de = (struct iso_directory_record *) (bh->b_data + offset);
552 de_len = *(unsigned char *) de;
553 if (de_len == 0)
554 break;
555 files++;
556 offset += de_len;
557 }
558 brelse(bh);
559 return files < 3;
560}
561
562/*
563 * Initialize the superblock and read the root inode.
564 *
565 * Note: a check_disk_change() has been done immediately prior
566 * to this call, so we don't need to check again.
567 */
568static int isofs_fill_super(struct super_block *s, void *data, int silent)
569{
570 struct buffer_head *bh = NULL, *pri_bh = NULL;
571 struct hs_primary_descriptor *h_pri = NULL;
572 struct iso_primary_descriptor *pri = NULL;
573 struct iso_supplementary_descriptor *sec = NULL;
574 struct iso_directory_record *rootp;
575 struct inode *inode;
576 struct iso9660_options opt;
577 struct isofs_sb_info *sbi;
578 unsigned long first_data_zone;
579 int joliet_level = 0;
580 int iso_blknum, block;
581 int orig_zonesize;
582 int table, error = -EINVAL;
583 unsigned int vol_desc_start;
584
585 save_mount_options(s, data);
586
587 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
588 if (!sbi)
589 return -ENOMEM;
590 s->s_fs_info = sbi;
591
592 if (!parse_options((char *)data, &opt))
593 goto out_freesbi;
594
595 /*
596 * First of all, get the hardware blocksize for this device.
597 * If we don't know what it is, or the hardware blocksize is
598 * larger than the blocksize the user specified, then use
599 * that value.
600 */
601 /*
602 * What if bugger tells us to go beyond page size?
603 */
604 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
605
606 sbi->s_high_sierra = 0; /* default is iso9660 */
607
608 vol_desc_start = (opt.sbsector != -1) ?
609 opt.sbsector : isofs_get_last_session(s,opt.session);
610
611 for (iso_blknum = vol_desc_start+16;
612 iso_blknum < vol_desc_start+100; iso_blknum++) {
613 struct hs_volume_descriptor *hdp;
614 struct iso_volume_descriptor *vdp;
615
616 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
617 if (!(bh = sb_bread(s, block)))
618 goto out_no_read;
619
620 vdp = (struct iso_volume_descriptor *)bh->b_data;
621 hdp = (struct hs_volume_descriptor *)bh->b_data;
622
623 /*
624 * Due to the overlapping physical location of the descriptors,
625 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
626 * proper identification in this case, we first check for ISO.
627 */
628 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
629 if (isonum_711(vdp->type) == ISO_VD_END)
630 break;
631 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
632 if (pri == NULL) {
633 pri = (struct iso_primary_descriptor *)vdp;
634 /* Save the buffer in case we need it ... */
635 pri_bh = bh;
636 bh = NULL;
637 }
638 }
639#ifdef CONFIG_JOLIET
640 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
641 sec = (struct iso_supplementary_descriptor *)vdp;
642 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
643 if (opt.joliet) {
644 if (sec->escape[2] == 0x40)
645 joliet_level = 1;
646 else if (sec->escape[2] == 0x43)
647 joliet_level = 2;
648 else if (sec->escape[2] == 0x45)
649 joliet_level = 3;
650
651 printk(KERN_DEBUG "ISO 9660 Extensions: "
652 "Microsoft Joliet Level %d\n",
653 joliet_level);
654 }
655 goto root_found;
656 } else {
657 /* Unknown supplementary volume descriptor */
658 sec = NULL;
659 }
660 }
661#endif
662 } else {
663 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
664 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
665 goto out_freebh;
666
667 sbi->s_high_sierra = 1;
668 opt.rock = 0;
669 h_pri = (struct hs_primary_descriptor *)vdp;
670 goto root_found;
671 }
672 }
673
674 /* Just skip any volume descriptors we don't recognize */
675
676 brelse(bh);
677 bh = NULL;
678 }
679 /*
680 * If we fall through, either no volume descriptor was found,
681 * or else we passed a primary descriptor looking for others.
682 */
683 if (!pri)
684 goto out_unknown_format;
685 brelse(bh);
686 bh = pri_bh;
687 pri_bh = NULL;
688
689root_found:
690 /* We don't support read-write mounts */
691 if (!(s->s_flags & MS_RDONLY)) {
692 error = -EACCES;
693 goto out_freebh;
694 }
695
696 if (joliet_level && (pri == NULL || !opt.rock)) {
697 /* This is the case of Joliet with the norock mount flag.
698 * A disc with both Joliet and Rock Ridge is handled later
699 */
700 pri = (struct iso_primary_descriptor *) sec;
701 }
702
703 if(sbi->s_high_sierra){
704 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
705 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
706 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
707 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
708 } else {
709 if (!pri)
710 goto out_freebh;
711 rootp = (struct iso_directory_record *) pri->root_directory_record;
712 sbi->s_nzones = isonum_733(pri->volume_space_size);
713 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
714 sbi->s_max_size = isonum_733(pri->volume_space_size);
715 }
716
717 sbi->s_ninodes = 0; /* No way to figure this out easily */
718
719 orig_zonesize = sbi->s_log_zone_size;
720 /*
721 * If the zone size is smaller than the hardware sector size,
722 * this is a fatal error. This would occur if the disc drive
723 * had sectors that were 2048 bytes, but the filesystem had
724 * blocks that were 512 bytes (which should only very rarely
725 * happen.)
726 */
727 if (orig_zonesize < opt.blocksize)
728 goto out_bad_size;
729
730 /* RDE: convert log zone size to bit shift */
731 switch (sbi->s_log_zone_size) {
732 case 512: sbi->s_log_zone_size = 9; break;
733 case 1024: sbi->s_log_zone_size = 10; break;
734 case 2048: sbi->s_log_zone_size = 11; break;
735
736 default:
737 goto out_bad_zone_size;
738 }
739
740 s->s_magic = ISOFS_SUPER_MAGIC;
741
742 /*
743 * With multi-extent files, file size is only limited by the maximum
744 * size of a file system, which is 8 TB.
745 */
746 s->s_maxbytes = 0x80000000000LL;
747
748 /* Set this for reference. Its not currently used except on write
749 which we don't have .. */
750
751 first_data_zone = isonum_733(rootp->extent) +
752 isonum_711(rootp->ext_attr_length);
753 sbi->s_firstdatazone = first_data_zone;
754#ifndef BEQUIET
755 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
756 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
757 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
758 if(sbi->s_high_sierra)
759 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
760#endif
761
762 /*
763 * If the Joliet level is set, we _may_ decide to use the
764 * secondary descriptor, but can't be sure until after we
765 * read the root inode. But before reading the root inode
766 * we may need to change the device blocksize, and would
767 * rather release the old buffer first. So, we cache the
768 * first_data_zone value from the secondary descriptor.
769 */
770 if (joliet_level) {
771 pri = (struct iso_primary_descriptor *) sec;
772 rootp = (struct iso_directory_record *)
773 pri->root_directory_record;
774 first_data_zone = isonum_733(rootp->extent) +
775 isonum_711(rootp->ext_attr_length);
776 }
777
778 /*
779 * We're all done using the volume descriptor, and may need
780 * to change the device blocksize, so release the buffer now.
781 */
782 brelse(pri_bh);
783 brelse(bh);
784
785 /*
786 * Force the blocksize to 512 for 512 byte sectors. The file
787 * read primitives really get it wrong in a bad way if we don't
788 * do this.
789 *
790 * Note - we should never be setting the blocksize to something
791 * less than the hardware sector size for the device. If we
792 * do, we would end up having to read larger buffers and split
793 * out portions to satisfy requests.
794 *
795 * Note2- the idea here is that we want to deal with the optimal
796 * zonesize in the filesystem. If we have it set to something less,
797 * then we have horrible problems with trying to piece together
798 * bits of adjacent blocks in order to properly read directory
799 * entries. By forcing the blocksize in this way, we ensure
800 * that we will never be required to do this.
801 */
802 sb_set_blocksize(s, orig_zonesize);
803
804 sbi->s_nls_iocharset = NULL;
805
806#ifdef CONFIG_JOLIET
807 if (joliet_level && opt.utf8 == 0) {
808 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
809 sbi->s_nls_iocharset = load_nls(p);
810 if (! sbi->s_nls_iocharset) {
811 /* Fail only if explicit charset specified */
812 if (opt.iocharset)
813 goto out_freesbi;
814 sbi->s_nls_iocharset = load_nls_default();
815 }
816 }
817#endif
818 s->s_op = &isofs_sops;
819 s->s_export_op = &isofs_export_ops;
820 sbi->s_mapping = opt.map;
821 sbi->s_rock = (opt.rock ? 2 : 0);
822 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
823 sbi->s_cruft = opt.cruft;
824 sbi->s_hide = opt.hide;
825 sbi->s_showassoc = opt.showassoc;
826 sbi->s_uid = opt.uid;
827 sbi->s_gid = opt.gid;
828 sbi->s_uid_set = opt.uid_set;
829 sbi->s_gid_set = opt.gid_set;
830 sbi->s_utf8 = opt.utf8;
831 sbi->s_nocompress = opt.nocompress;
832 sbi->s_overriderockperm = opt.overriderockperm;
833 /*
834 * It would be incredibly stupid to allow people to mark every file
835 * on the disk as suid, so we merely allow them to set the default
836 * permissions.
837 */
838 if (opt.fmode != ISOFS_INVALID_MODE)
839 sbi->s_fmode = opt.fmode & 0777;
840 else
841 sbi->s_fmode = ISOFS_INVALID_MODE;
842 if (opt.dmode != ISOFS_INVALID_MODE)
843 sbi->s_dmode = opt.dmode & 0777;
844 else
845 sbi->s_dmode = ISOFS_INVALID_MODE;
846
847 /*
848 * Read the root inode, which _may_ result in changing
849 * the s_rock flag. Once we have the final s_rock value,
850 * we then decide whether to use the Joliet descriptor.
851 */
852 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
853 if (IS_ERR(inode))
854 goto out_no_root;
855
856 /*
857 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
858 * correct Joliet root directory.
859 */
860 if (sbi->s_rock == 1 && joliet_level &&
861 rootdir_empty(s, sbi->s_firstdatazone)) {
862 printk(KERN_NOTICE
863 "ISOFS: primary root directory is empty. "
864 "Disabling Rock Ridge and switching to Joliet.");
865 sbi->s_rock = 0;
866 }
867
868 /*
869 * If this disk has both Rock Ridge and Joliet on it, then we
870 * want to use Rock Ridge by default. This can be overridden
871 * by using the norock mount option. There is still one other
872 * possibility that is not taken into account: a Rock Ridge
873 * CD with Unicode names. Until someone sees such a beast, it
874 * will not be supported.
875 */
876 if (sbi->s_rock == 1) {
877 joliet_level = 0;
878 } else if (joliet_level) {
879 sbi->s_rock = 0;
880 if (sbi->s_firstdatazone != first_data_zone) {
881 sbi->s_firstdatazone = first_data_zone;
882 printk(KERN_DEBUG
883 "ISOFS: changing to secondary root\n");
884 iput(inode);
885 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
886 if (IS_ERR(inode))
887 goto out_no_root;
888 }
889 }
890
891 if (opt.check == 'u') {
892 /* Only Joliet is case insensitive by default */
893 if (joliet_level)
894 opt.check = 'r';
895 else
896 opt.check = 's';
897 }
898 sbi->s_joliet_level = joliet_level;
899
900 /* Make sure the root inode is a directory */
901 if (!S_ISDIR(inode->i_mode)) {
902 printk(KERN_WARNING
903 "isofs_fill_super: root inode is not a directory. "
904 "Corrupted media?\n");
905 goto out_iput;
906 }
907
908 table = 0;
909 if (joliet_level)
910 table += 2;
911 if (opt.check == 'r')
912 table++;
913
914 if (table)
915 s->s_d_op = &isofs_dentry_ops[table - 1];
916
917 /* get the root dentry */
918 s->s_root = d_make_root(inode);
919 if (!(s->s_root)) {
920 error = -ENOMEM;
921 goto out_no_inode;
922 }
923
924 kfree(opt.iocharset);
925
926 return 0;
927
928 /*
929 * Display error messages and free resources.
930 */
931out_iput:
932 iput(inode);
933 goto out_no_inode;
934out_no_root:
935 error = PTR_ERR(inode);
936 if (error != -ENOMEM)
937 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
938out_no_inode:
939#ifdef CONFIG_JOLIET
940 unload_nls(sbi->s_nls_iocharset);
941#endif
942 goto out_freesbi;
943out_no_read:
944 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
945 __func__, s->s_id, iso_blknum, block);
946 goto out_freebh;
947out_bad_zone_size:
948 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
949 sbi->s_log_zone_size);
950 goto out_freebh;
951out_bad_size:
952 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
953 orig_zonesize, opt.blocksize);
954 goto out_freebh;
955out_unknown_format:
956 if (!silent)
957 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
958
959out_freebh:
960 brelse(bh);
961 brelse(pri_bh);
962out_freesbi:
963 kfree(opt.iocharset);
964 kfree(sbi);
965 s->s_fs_info = NULL;
966 return error;
967}
968
969static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
970{
971 struct super_block *sb = dentry->d_sb;
972 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
973
974 buf->f_type = ISOFS_SUPER_MAGIC;
975 buf->f_bsize = sb->s_blocksize;
976 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
977 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
978 buf->f_bfree = 0;
979 buf->f_bavail = 0;
980 buf->f_files = ISOFS_SB(sb)->s_ninodes;
981 buf->f_ffree = 0;
982 buf->f_fsid.val[0] = (u32)id;
983 buf->f_fsid.val[1] = (u32)(id >> 32);
984 buf->f_namelen = NAME_MAX;
985 return 0;
986}
987
988/*
989 * Get a set of blocks; filling in buffer_heads if already allocated
990 * or getblk() if they are not. Returns the number of blocks inserted
991 * (-ve == error.)
992 */
993int isofs_get_blocks(struct inode *inode, sector_t iblock,
994 struct buffer_head **bh, unsigned long nblocks)
995{
996 unsigned long b_off = iblock;
997 unsigned offset, sect_size;
998 unsigned int firstext;
999 unsigned long nextblk, nextoff;
1000 int section, rv, error;
1001 struct iso_inode_info *ei = ISOFS_I(inode);
1002
1003 error = -EIO;
1004 rv = 0;
1005 if (iblock != b_off) {
1006 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1007 goto abort;
1008 }
1009
1010
1011 offset = 0;
1012 firstext = ei->i_first_extent;
1013 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1014 nextblk = ei->i_next_section_block;
1015 nextoff = ei->i_next_section_offset;
1016 section = 0;
1017
1018 while (nblocks) {
1019 /* If we are *way* beyond the end of the file, print a message.
1020 * Access beyond the end of the file up to the next page boundary
1021 * is normal, however because of the way the page cache works.
1022 * In this case, we just return 0 so that we can properly fill
1023 * the page with useless information without generating any
1024 * I/O errors.
1025 */
1026 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1027 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1028 __func__, b_off,
1029 (unsigned long long)inode->i_size);
1030 goto abort;
1031 }
1032
1033 /* On the last section, nextblk == 0, section size is likely to
1034 * exceed sect_size by a partial block, and access beyond the
1035 * end of the file will reach beyond the section size, too.
1036 */
1037 while (nextblk && (b_off >= (offset + sect_size))) {
1038 struct inode *ninode;
1039
1040 offset += sect_size;
1041 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1042 if (IS_ERR(ninode)) {
1043 error = PTR_ERR(ninode);
1044 goto abort;
1045 }
1046 firstext = ISOFS_I(ninode)->i_first_extent;
1047 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1048 nextblk = ISOFS_I(ninode)->i_next_section_block;
1049 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1050 iput(ninode);
1051
1052 if (++section > 100) {
1053 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1054 " aborting...\n", __func__);
1055 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1056 "nextblk=%lu nextoff=%lu\n", __func__,
1057 b_off, firstext, (unsigned) sect_size,
1058 nextblk, nextoff);
1059 goto abort;
1060 }
1061 }
1062
1063 if (*bh) {
1064 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1065 } else {
1066 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1067 if (!*bh)
1068 goto abort;
1069 }
1070 bh++; /* Next buffer head */
1071 b_off++; /* Next buffer offset */
1072 nblocks--;
1073 rv++;
1074 }
1075
1076 error = 0;
1077abort:
1078 return rv != 0 ? rv : error;
1079}
1080
1081/*
1082 * Used by the standard interfaces.
1083 */
1084static int isofs_get_block(struct inode *inode, sector_t iblock,
1085 struct buffer_head *bh_result, int create)
1086{
1087 int ret;
1088
1089 if (create) {
1090 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1091 return -EROFS;
1092 }
1093
1094 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1095 return ret < 0 ? ret : 0;
1096}
1097
1098static int isofs_bmap(struct inode *inode, sector_t block)
1099{
1100 struct buffer_head dummy;
1101 int error;
1102
1103 dummy.b_state = 0;
1104 dummy.b_blocknr = -1000;
1105 error = isofs_get_block(inode, block, &dummy, 0);
1106 if (!error)
1107 return dummy.b_blocknr;
1108 return 0;
1109}
1110
1111struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1112{
1113 sector_t blknr = isofs_bmap(inode, block);
1114 if (!blknr)
1115 return NULL;
1116 return sb_bread(inode->i_sb, blknr);
1117}
1118
1119static int isofs_readpage(struct file *file, struct page *page)
1120{
1121 return mpage_readpage(page, isofs_get_block);
1122}
1123
1124static int isofs_readpages(struct file *file, struct address_space *mapping,
1125 struct list_head *pages, unsigned nr_pages)
1126{
1127 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1128}
1129
1130static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1131{
1132 return generic_block_bmap(mapping,block,isofs_get_block);
1133}
1134
1135static const struct address_space_operations isofs_aops = {
1136 .readpage = isofs_readpage,
1137 .readpages = isofs_readpages,
1138 .bmap = _isofs_bmap
1139};
1140
1141static int isofs_read_level3_size(struct inode *inode)
1142{
1143 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1144 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1145 struct buffer_head *bh = NULL;
1146 unsigned long block, offset, block_saved, offset_saved;
1147 int i = 0;
1148 int more_entries = 0;
1149 struct iso_directory_record *tmpde = NULL;
1150 struct iso_inode_info *ei = ISOFS_I(inode);
1151
1152 inode->i_size = 0;
1153
1154 /* The first 16 blocks are reserved as the System Area. Thus,
1155 * no inodes can appear in block 0. We use this to flag that
1156 * this is the last section. */
1157 ei->i_next_section_block = 0;
1158 ei->i_next_section_offset = 0;
1159
1160 block = ei->i_iget5_block;
1161 offset = ei->i_iget5_offset;
1162
1163 do {
1164 struct iso_directory_record *de;
1165 unsigned int de_len;
1166
1167 if (!bh) {
1168 bh = sb_bread(inode->i_sb, block);
1169 if (!bh)
1170 goto out_noread;
1171 }
1172 de = (struct iso_directory_record *) (bh->b_data + offset);
1173 de_len = *(unsigned char *) de;
1174
1175 if (de_len == 0) {
1176 brelse(bh);
1177 bh = NULL;
1178 ++block;
1179 offset = 0;
1180 continue;
1181 }
1182
1183 block_saved = block;
1184 offset_saved = offset;
1185 offset += de_len;
1186
1187 /* Make sure we have a full directory entry */
1188 if (offset >= bufsize) {
1189 int slop = bufsize - offset + de_len;
1190 if (!tmpde) {
1191 tmpde = kmalloc(256, GFP_KERNEL);
1192 if (!tmpde)
1193 goto out_nomem;
1194 }
1195 memcpy(tmpde, de, slop);
1196 offset &= bufsize - 1;
1197 block++;
1198 brelse(bh);
1199 bh = NULL;
1200 if (offset) {
1201 bh = sb_bread(inode->i_sb, block);
1202 if (!bh)
1203 goto out_noread;
1204 memcpy((void *)tmpde+slop, bh->b_data, offset);
1205 }
1206 de = tmpde;
1207 }
1208
1209 inode->i_size += isonum_733(de->size);
1210 if (i == 1) {
1211 ei->i_next_section_block = block_saved;
1212 ei->i_next_section_offset = offset_saved;
1213 }
1214
1215 more_entries = de->flags[-high_sierra] & 0x80;
1216
1217 i++;
1218 if (i > 100)
1219 goto out_toomany;
1220 } while (more_entries);
1221out:
1222 kfree(tmpde);
1223 if (bh)
1224 brelse(bh);
1225 return 0;
1226
1227out_nomem:
1228 if (bh)
1229 brelse(bh);
1230 return -ENOMEM;
1231
1232out_noread:
1233 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1234 kfree(tmpde);
1235 return -EIO;
1236
1237out_toomany:
1238 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1239 "isofs_read_level3_size: inode=%lu\n",
1240 __func__, inode->i_ino);
1241 goto out;
1242}
1243
1244static int isofs_read_inode(struct inode *inode, int relocated)
1245{
1246 struct super_block *sb = inode->i_sb;
1247 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1248 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1249 unsigned long block;
1250 int high_sierra = sbi->s_high_sierra;
1251 struct buffer_head *bh = NULL;
1252 struct iso_directory_record *de;
1253 struct iso_directory_record *tmpde = NULL;
1254 unsigned int de_len;
1255 unsigned long offset;
1256 struct iso_inode_info *ei = ISOFS_I(inode);
1257 int ret = -EIO;
1258
1259 block = ei->i_iget5_block;
1260 bh = sb_bread(inode->i_sb, block);
1261 if (!bh)
1262 goto out_badread;
1263
1264 offset = ei->i_iget5_offset;
1265
1266 de = (struct iso_directory_record *) (bh->b_data + offset);
1267 de_len = *(unsigned char *) de;
1268
1269 if (offset + de_len > bufsize) {
1270 int frag1 = bufsize - offset;
1271
1272 tmpde = kmalloc(de_len, GFP_KERNEL);
1273 if (tmpde == NULL) {
1274 printk(KERN_INFO "%s: out of memory\n", __func__);
1275 ret = -ENOMEM;
1276 goto fail;
1277 }
1278 memcpy(tmpde, bh->b_data + offset, frag1);
1279 brelse(bh);
1280 bh = sb_bread(inode->i_sb, ++block);
1281 if (!bh)
1282 goto out_badread;
1283 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1284 de = tmpde;
1285 }
1286
1287 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1288 ei->i_iget5_offset,
1289 ISOFS_BUFFER_BITS(inode));
1290
1291 /* Assume it is a normal-format file unless told otherwise */
1292 ei->i_file_format = isofs_file_normal;
1293
1294 if (de->flags[-high_sierra] & 2) {
1295 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1296 inode->i_mode = S_IFDIR | sbi->s_dmode;
1297 else
1298 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1299 set_nlink(inode, 1); /*
1300 * Set to 1. We know there are 2, but
1301 * the find utility tries to optimize
1302 * if it is 2, and it screws up. It is
1303 * easier to give 1 which tells find to
1304 * do it the hard way.
1305 */
1306 } else {
1307 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1308 inode->i_mode = S_IFREG | sbi->s_fmode;
1309 } else {
1310 /*
1311 * Set default permissions: r-x for all. The disc
1312 * could be shared with DOS machines so virtually
1313 * anything could be a valid executable.
1314 */
1315 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1316 }
1317 set_nlink(inode, 1);
1318 }
1319 inode->i_uid = sbi->s_uid;
1320 inode->i_gid = sbi->s_gid;
1321 inode->i_blocks = 0;
1322
1323 ei->i_format_parm[0] = 0;
1324 ei->i_format_parm[1] = 0;
1325 ei->i_format_parm[2] = 0;
1326
1327 ei->i_section_size = isonum_733(de->size);
1328 if (de->flags[-high_sierra] & 0x80) {
1329 ret = isofs_read_level3_size(inode);
1330 if (ret < 0)
1331 goto fail;
1332 ret = -EIO;
1333 } else {
1334 ei->i_next_section_block = 0;
1335 ei->i_next_section_offset = 0;
1336 inode->i_size = isonum_733(de->size);
1337 }
1338
1339 /*
1340 * Some dipshit decided to store some other bit of information
1341 * in the high byte of the file length. Truncate size in case
1342 * this CDROM was mounted with the cruft option.
1343 */
1344
1345 if (sbi->s_cruft)
1346 inode->i_size &= 0x00ffffff;
1347
1348 if (de->interleave[0]) {
1349 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1350 inode->i_size = 0;
1351 }
1352
1353 /* I have no idea what file_unit_size is used for, so
1354 we will flag it for now */
1355 if (de->file_unit_size[0] != 0) {
1356 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1357 inode->i_ino);
1358 }
1359
1360 /* I have no idea what other flag bits are used for, so
1361 we will flag it for now */
1362#ifdef DEBUG
1363 if((de->flags[-high_sierra] & ~2)!= 0){
1364 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1365 "(%ld %x).\n",
1366 inode->i_ino, de->flags[-high_sierra]);
1367 }
1368#endif
1369
1370 inode->i_mtime.tv_sec =
1371 inode->i_atime.tv_sec =
1372 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1373 inode->i_mtime.tv_nsec =
1374 inode->i_atime.tv_nsec =
1375 inode->i_ctime.tv_nsec = 0;
1376
1377 ei->i_first_extent = (isonum_733(de->extent) +
1378 isonum_711(de->ext_attr_length));
1379
1380 /* Set the number of blocks for stat() - should be done before RR */
1381 inode->i_blocks = (inode->i_size + 511) >> 9;
1382
1383 /*
1384 * Now test for possible Rock Ridge extensions which will override
1385 * some of these numbers in the inode structure.
1386 */
1387
1388 if (!high_sierra) {
1389 parse_rock_ridge_inode(de, inode, relocated);
1390 /* if we want uid/gid set, override the rock ridge setting */
1391 if (sbi->s_uid_set)
1392 inode->i_uid = sbi->s_uid;
1393 if (sbi->s_gid_set)
1394 inode->i_gid = sbi->s_gid;
1395 }
1396 /* Now set final access rights if overriding rock ridge setting */
1397 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1398 sbi->s_dmode != ISOFS_INVALID_MODE)
1399 inode->i_mode = S_IFDIR | sbi->s_dmode;
1400 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1401 sbi->s_fmode != ISOFS_INVALID_MODE)
1402 inode->i_mode = S_IFREG | sbi->s_fmode;
1403
1404 /* Install the inode operations vector */
1405 if (S_ISREG(inode->i_mode)) {
1406 inode->i_fop = &generic_ro_fops;
1407 switch (ei->i_file_format) {
1408#ifdef CONFIG_ZISOFS
1409 case isofs_file_compressed:
1410 inode->i_data.a_ops = &zisofs_aops;
1411 break;
1412#endif
1413 default:
1414 inode->i_data.a_ops = &isofs_aops;
1415 break;
1416 }
1417 } else if (S_ISDIR(inode->i_mode)) {
1418 inode->i_op = &isofs_dir_inode_operations;
1419 inode->i_fop = &isofs_dir_operations;
1420 } else if (S_ISLNK(inode->i_mode)) {
1421 inode->i_op = &page_symlink_inode_operations;
1422 inode_nohighmem(inode);
1423 inode->i_data.a_ops = &isofs_symlink_aops;
1424 } else
1425 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1426 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1427
1428 ret = 0;
1429out:
1430 kfree(tmpde);
1431 if (bh)
1432 brelse(bh);
1433 return ret;
1434
1435out_badread:
1436 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1437fail:
1438 goto out;
1439}
1440
1441struct isofs_iget5_callback_data {
1442 unsigned long block;
1443 unsigned long offset;
1444};
1445
1446static int isofs_iget5_test(struct inode *ino, void *data)
1447{
1448 struct iso_inode_info *i = ISOFS_I(ino);
1449 struct isofs_iget5_callback_data *d =
1450 (struct isofs_iget5_callback_data*)data;
1451 return (i->i_iget5_block == d->block)
1452 && (i->i_iget5_offset == d->offset);
1453}
1454
1455static int isofs_iget5_set(struct inode *ino, void *data)
1456{
1457 struct iso_inode_info *i = ISOFS_I(ino);
1458 struct isofs_iget5_callback_data *d =
1459 (struct isofs_iget5_callback_data*)data;
1460 i->i_iget5_block = d->block;
1461 i->i_iget5_offset = d->offset;
1462 return 0;
1463}
1464
1465/* Store, in the inode's containing structure, the block and block
1466 * offset that point to the underlying meta-data for the inode. The
1467 * code below is otherwise similar to the iget() code in
1468 * include/linux/fs.h */
1469struct inode *__isofs_iget(struct super_block *sb,
1470 unsigned long block,
1471 unsigned long offset,
1472 int relocated)
1473{
1474 unsigned long hashval;
1475 struct inode *inode;
1476 struct isofs_iget5_callback_data data;
1477 long ret;
1478
1479 if (offset >= 1ul << sb->s_blocksize_bits)
1480 return ERR_PTR(-EINVAL);
1481
1482 data.block = block;
1483 data.offset = offset;
1484
1485 hashval = (block << sb->s_blocksize_bits) | offset;
1486
1487 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1488 &isofs_iget5_set, &data);
1489
1490 if (!inode)
1491 return ERR_PTR(-ENOMEM);
1492
1493 if (inode->i_state & I_NEW) {
1494 ret = isofs_read_inode(inode, relocated);
1495 if (ret < 0) {
1496 iget_failed(inode);
1497 inode = ERR_PTR(ret);
1498 } else {
1499 unlock_new_inode(inode);
1500 }
1501 }
1502
1503 return inode;
1504}
1505
1506static struct dentry *isofs_mount(struct file_system_type *fs_type,
1507 int flags, const char *dev_name, void *data)
1508{
1509 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1510}
1511
1512static struct file_system_type iso9660_fs_type = {
1513 .owner = THIS_MODULE,
1514 .name = "iso9660",
1515 .mount = isofs_mount,
1516 .kill_sb = kill_block_super,
1517 .fs_flags = FS_REQUIRES_DEV,
1518};
1519MODULE_ALIAS_FS("iso9660");
1520MODULE_ALIAS("iso9660");
1521
1522static int __init init_iso9660_fs(void)
1523{
1524 int err = init_inodecache();
1525 if (err)
1526 goto out;
1527#ifdef CONFIG_ZISOFS
1528 err = zisofs_init();
1529 if (err)
1530 goto out1;
1531#endif
1532 err = register_filesystem(&iso9660_fs_type);
1533 if (err)
1534 goto out2;
1535 return 0;
1536out2:
1537#ifdef CONFIG_ZISOFS
1538 zisofs_cleanup();
1539out1:
1540#endif
1541 destroy_inodecache();
1542out:
1543 return err;
1544}
1545
1546static void __exit exit_iso9660_fs(void)
1547{
1548 unregister_filesystem(&iso9660_fs_type);
1549#ifdef CONFIG_ZISOFS
1550 zisofs_cleanup();
1551#endif
1552 destroy_inodecache();
1553}
1554
1555module_init(init_iso9660_fs)
1556module_exit(exit_iso9660_fs)
1557MODULE_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/parser.h>
25#include <linux/mpage.h>
26#include <linux/user_namespace.h>
27#include <linux/seq_file.h>
28#include <linux/blkdev.h>
29
30#include "isofs.h"
31#include "zisofs.h"
32
33/* max tz offset is 13 hours */
34#define MAX_TZ_OFFSET (52*15*60)
35
36#define BEQUIET
37
38static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
39static int isofs_dentry_cmpi(const struct dentry *dentry,
40 unsigned int len, const char *str, const struct qstr *name);
41
42#ifdef CONFIG_JOLIET
43static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
44static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
45static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
46 unsigned int len, const char *str, const struct qstr *name);
47static int isofs_dentry_cmp_ms(const struct dentry *dentry,
48 unsigned int len, const char *str, const struct qstr *name);
49#endif
50
51static void isofs_put_super(struct super_block *sb)
52{
53 struct isofs_sb_info *sbi = ISOFS_SB(sb);
54
55#ifdef CONFIG_JOLIET
56 unload_nls(sbi->s_nls_iocharset);
57#endif
58
59 kfree(sbi);
60 sb->s_fs_info = NULL;
61 return;
62}
63
64static int isofs_read_inode(struct inode *, int relocated);
65static int isofs_statfs (struct dentry *, struct kstatfs *);
66static int isofs_show_options(struct seq_file *, struct dentry *);
67
68static struct kmem_cache *isofs_inode_cachep;
69
70static struct inode *isofs_alloc_inode(struct super_block *sb)
71{
72 struct iso_inode_info *ei;
73 ei = alloc_inode_sb(sb, isofs_inode_cachep, GFP_KERNEL);
74 if (!ei)
75 return NULL;
76 return &ei->vfs_inode;
77}
78
79static void isofs_free_inode(struct inode *inode)
80{
81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
82}
83
84static void init_once(void *foo)
85{
86 struct iso_inode_info *ei = foo;
87
88 inode_init_once(&ei->vfs_inode);
89}
90
91static int __init init_inodecache(void)
92{
93 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
94 sizeof(struct iso_inode_info),
95 0, (SLAB_RECLAIM_ACCOUNT|
96 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
97 init_once);
98 if (!isofs_inode_cachep)
99 return -ENOMEM;
100 return 0;
101}
102
103static void destroy_inodecache(void)
104{
105 /*
106 * Make sure all delayed rcu free inodes are flushed before we
107 * destroy cache.
108 */
109 rcu_barrier();
110 kmem_cache_destroy(isofs_inode_cachep);
111}
112
113static int isofs_remount(struct super_block *sb, int *flags, char *data)
114{
115 sync_filesystem(sb);
116 if (!(*flags & SB_RDONLY))
117 return -EROFS;
118 return 0;
119}
120
121static const struct super_operations isofs_sops = {
122 .alloc_inode = isofs_alloc_inode,
123 .free_inode = isofs_free_inode,
124 .put_super = isofs_put_super,
125 .statfs = isofs_statfs,
126 .remount_fs = isofs_remount,
127 .show_options = isofs_show_options,
128};
129
130
131static const struct dentry_operations isofs_dentry_ops[] = {
132 {
133 .d_hash = isofs_hashi,
134 .d_compare = isofs_dentry_cmpi,
135 },
136#ifdef CONFIG_JOLIET
137 {
138 .d_hash = isofs_hash_ms,
139 .d_compare = isofs_dentry_cmp_ms,
140 },
141 {
142 .d_hash = isofs_hashi_ms,
143 .d_compare = isofs_dentry_cmpi_ms,
144 },
145#endif
146};
147
148struct iso9660_options{
149 unsigned int rock:1;
150 unsigned int joliet:1;
151 unsigned int cruft:1;
152 unsigned int hide:1;
153 unsigned int showassoc:1;
154 unsigned int nocompress:1;
155 unsigned int overriderockperm:1;
156 unsigned int uid_set:1;
157 unsigned int gid_set:1;
158 unsigned char map;
159 unsigned char check;
160 unsigned int blocksize;
161 umode_t fmode;
162 umode_t dmode;
163 kgid_t gid;
164 kuid_t uid;
165 char *iocharset;
166 /* LVE */
167 s32 session;
168 s32 sbsector;
169};
170
171/*
172 * Compute the hash for the isofs name corresponding to the dentry.
173 */
174static int
175isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
176{
177 const char *name;
178 int len;
179 char c;
180 unsigned long hash;
181
182 len = qstr->len;
183 name = qstr->name;
184 if (ms) {
185 while (len && name[len-1] == '.')
186 len--;
187 }
188
189 hash = init_name_hash(dentry);
190 while (len--) {
191 c = tolower(*name++);
192 hash = partial_name_hash(c, hash);
193 }
194 qstr->hash = end_name_hash(hash);
195
196 return 0;
197}
198
199/*
200 * Compare of two isofs names.
201 */
202static int isofs_dentry_cmp_common(
203 unsigned int len, const char *str,
204 const struct qstr *name, int ms, int ci)
205{
206 int alen, blen;
207
208 /* A filename cannot end in '.' or we treat it like it has none */
209 alen = name->len;
210 blen = len;
211 if (ms) {
212 while (alen && name->name[alen-1] == '.')
213 alen--;
214 while (blen && str[blen-1] == '.')
215 blen--;
216 }
217 if (alen == blen) {
218 if (ci) {
219 if (strncasecmp(name->name, str, alen) == 0)
220 return 0;
221 } else {
222 if (strncmp(name->name, str, alen) == 0)
223 return 0;
224 }
225 }
226 return 1;
227}
228
229static int
230isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
231{
232 return isofs_hashi_common(dentry, qstr, 0);
233}
234
235static int
236isofs_dentry_cmpi(const struct dentry *dentry,
237 unsigned int len, const char *str, const struct qstr *name)
238{
239 return isofs_dentry_cmp_common(len, str, name, 0, 1);
240}
241
242#ifdef CONFIG_JOLIET
243/*
244 * Compute the hash for the isofs name corresponding to the dentry.
245 */
246static int
247isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
248{
249 const char *name;
250 int len;
251
252 len = qstr->len;
253 name = qstr->name;
254 if (ms) {
255 while (len && name[len-1] == '.')
256 len--;
257 }
258
259 qstr->hash = full_name_hash(dentry, name, len);
260
261 return 0;
262}
263
264static int
265isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
266{
267 return isofs_hash_common(dentry, qstr, 1);
268}
269
270static int
271isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
272{
273 return isofs_hashi_common(dentry, qstr, 1);
274}
275
276static int
277isofs_dentry_cmp_ms(const struct dentry *dentry,
278 unsigned int len, const char *str, const struct qstr *name)
279{
280 return isofs_dentry_cmp_common(len, str, name, 1, 0);
281}
282
283static int
284isofs_dentry_cmpi_ms(const struct dentry *dentry,
285 unsigned int len, const char *str, const struct qstr *name)
286{
287 return isofs_dentry_cmp_common(len, str, name, 1, 1);
288}
289#endif
290
291enum {
292 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
293 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
294 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
295 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
296};
297
298static const match_table_t tokens = {
299 {Opt_norock, "norock"},
300 {Opt_nojoliet, "nojoliet"},
301 {Opt_unhide, "unhide"},
302 {Opt_hide, "hide"},
303 {Opt_showassoc, "showassoc"},
304 {Opt_cruft, "cruft"},
305 {Opt_utf8, "utf8"},
306 {Opt_iocharset, "iocharset=%s"},
307 {Opt_map_a, "map=acorn"},
308 {Opt_map_a, "map=a"},
309 {Opt_map_n, "map=normal"},
310 {Opt_map_n, "map=n"},
311 {Opt_map_o, "map=off"},
312 {Opt_map_o, "map=o"},
313 {Opt_session, "session=%u"},
314 {Opt_sb, "sbsector=%u"},
315 {Opt_check_r, "check=relaxed"},
316 {Opt_check_r, "check=r"},
317 {Opt_check_s, "check=strict"},
318 {Opt_check_s, "check=s"},
319 {Opt_uid, "uid=%u"},
320 {Opt_gid, "gid=%u"},
321 {Opt_mode, "mode=%u"},
322 {Opt_dmode, "dmode=%u"},
323 {Opt_overriderockperm, "overriderockperm"},
324 {Opt_block, "block=%u"},
325 {Opt_ignore, "conv=binary"},
326 {Opt_ignore, "conv=b"},
327 {Opt_ignore, "conv=text"},
328 {Opt_ignore, "conv=t"},
329 {Opt_ignore, "conv=mtext"},
330 {Opt_ignore, "conv=m"},
331 {Opt_ignore, "conv=auto"},
332 {Opt_ignore, "conv=a"},
333 {Opt_nocompress, "nocompress"},
334 {Opt_err, NULL}
335};
336
337static int parse_options(char *options, struct iso9660_options *popt)
338{
339 char *p;
340 int option;
341 unsigned int uv;
342
343 popt->map = 'n';
344 popt->rock = 1;
345 popt->joliet = 1;
346 popt->cruft = 0;
347 popt->hide = 0;
348 popt->showassoc = 0;
349 popt->check = 'u'; /* unset */
350 popt->nocompress = 0;
351 popt->blocksize = 1024;
352 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
353 popt->uid_set = 0;
354 popt->gid_set = 0;
355 popt->gid = GLOBAL_ROOT_GID;
356 popt->uid = GLOBAL_ROOT_UID;
357 popt->iocharset = NULL;
358 popt->overriderockperm = 0;
359 popt->session=-1;
360 popt->sbsector=-1;
361 if (!options)
362 return 1;
363
364 while ((p = strsep(&options, ",")) != NULL) {
365 int token;
366 substring_t args[MAX_OPT_ARGS];
367 unsigned n;
368
369 if (!*p)
370 continue;
371
372 token = match_token(p, tokens, args);
373 switch (token) {
374 case Opt_norock:
375 popt->rock = 0;
376 break;
377 case Opt_nojoliet:
378 popt->joliet = 0;
379 break;
380 case Opt_hide:
381 popt->hide = 1;
382 break;
383 case Opt_unhide:
384 case Opt_showassoc:
385 popt->showassoc = 1;
386 break;
387 case Opt_cruft:
388 popt->cruft = 1;
389 break;
390#ifdef CONFIG_JOLIET
391 case Opt_utf8:
392 kfree(popt->iocharset);
393 popt->iocharset = kstrdup("utf8", GFP_KERNEL);
394 if (!popt->iocharset)
395 return 0;
396 break;
397 case Opt_iocharset:
398 kfree(popt->iocharset);
399 popt->iocharset = match_strdup(&args[0]);
400 if (!popt->iocharset)
401 return 0;
402 break;
403#endif
404 case Opt_map_a:
405 popt->map = 'a';
406 break;
407 case Opt_map_o:
408 popt->map = 'o';
409 break;
410 case Opt_map_n:
411 popt->map = 'n';
412 break;
413 case Opt_session:
414 if (match_int(&args[0], &option))
415 return 0;
416 n = option;
417 /*
418 * Track numbers are supposed to be in range 1-99, the
419 * mount option starts indexing at 0.
420 */
421 if (n >= 99)
422 return 0;
423 popt->session = n + 1;
424 break;
425 case Opt_sb:
426 if (match_int(&args[0], &option))
427 return 0;
428 popt->sbsector = option;
429 break;
430 case Opt_check_r:
431 popt->check = 'r';
432 break;
433 case Opt_check_s:
434 popt->check = 's';
435 break;
436 case Opt_ignore:
437 break;
438 case Opt_uid:
439 if (match_uint(&args[0], &uv))
440 return 0;
441 popt->uid = make_kuid(current_user_ns(), uv);
442 if (!uid_valid(popt->uid))
443 return 0;
444 popt->uid_set = 1;
445 break;
446 case Opt_gid:
447 if (match_uint(&args[0], &uv))
448 return 0;
449 popt->gid = make_kgid(current_user_ns(), uv);
450 if (!gid_valid(popt->gid))
451 return 0;
452 popt->gid_set = 1;
453 break;
454 case Opt_mode:
455 if (match_int(&args[0], &option))
456 return 0;
457 popt->fmode = option;
458 break;
459 case Opt_dmode:
460 if (match_int(&args[0], &option))
461 return 0;
462 popt->dmode = option;
463 break;
464 case Opt_overriderockperm:
465 popt->overriderockperm = 1;
466 break;
467 case Opt_block:
468 if (match_int(&args[0], &option))
469 return 0;
470 n = option;
471 if (n != 512 && n != 1024 && n != 2048)
472 return 0;
473 popt->blocksize = n;
474 break;
475 case Opt_nocompress:
476 popt->nocompress = 1;
477 break;
478 default:
479 return 0;
480 }
481 }
482 return 1;
483}
484
485/*
486 * Display the mount options in /proc/mounts.
487 */
488static int isofs_show_options(struct seq_file *m, struct dentry *root)
489{
490 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
491
492 if (!sbi->s_rock) seq_puts(m, ",norock");
493 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
494 if (sbi->s_cruft) seq_puts(m, ",cruft");
495 if (sbi->s_hide) seq_puts(m, ",hide");
496 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
497 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
498 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
499
500 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
501 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
502 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
503 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
504
505 if (root->d_sb->s_blocksize != 1024)
506 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
507
508 if (sbi->s_uid_set)
509 seq_printf(m, ",uid=%u",
510 from_kuid_munged(&init_user_ns, sbi->s_uid));
511 if (sbi->s_gid_set)
512 seq_printf(m, ",gid=%u",
513 from_kgid_munged(&init_user_ns, sbi->s_gid));
514
515 if (sbi->s_dmode != ISOFS_INVALID_MODE)
516 seq_printf(m, ",dmode=%o", sbi->s_dmode);
517 if (sbi->s_fmode != ISOFS_INVALID_MODE)
518 seq_printf(m, ",fmode=%o", sbi->s_fmode);
519
520#ifdef CONFIG_JOLIET
521 if (sbi->s_nls_iocharset)
522 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
523 else
524 seq_puts(m, ",iocharset=utf8");
525#endif
526 return 0;
527}
528
529/*
530 * look if the driver can tell the multi session redirection value
531 *
532 * don't change this if you don't know what you do, please!
533 * Multisession is legal only with XA disks.
534 * A non-XA disk with more than one volume descriptor may do it right, but
535 * usually is written in a nowhere standardized "multi-partition" manner.
536 * Multisession uses absolute addressing (solely the first frame of the whole
537 * track is #0), multi-partition uses relative addressing (each first frame of
538 * each track is #0), and a track is not a session.
539 *
540 * A broken CDwriter software or drive firmware does not set new standards,
541 * at least not if conflicting with the existing ones.
542 *
543 * emoenke@gwdg.de
544 */
545#define WE_OBEY_THE_WRITTEN_STANDARDS 1
546
547static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
548{
549 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
550 unsigned int vol_desc_start = 0;
551
552 if (session > 0) {
553 struct cdrom_tocentry te;
554
555 if (!cdi)
556 return 0;
557
558 te.cdte_track = session;
559 te.cdte_format = CDROM_LBA;
560 if (cdrom_read_tocentry(cdi, &te) == 0) {
561 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
562 session, te.cdte_addr.lba,
563 te.cdte_ctrl & CDROM_DATA_TRACK);
564 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
565 return te.cdte_addr.lba;
566 }
567
568 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
569 }
570
571 if (cdi) {
572 struct cdrom_multisession ms_info;
573
574 ms_info.addr_format = CDROM_LBA;
575 if (cdrom_multisession(cdi, &ms_info) == 0) {
576#if WE_OBEY_THE_WRITTEN_STANDARDS
577 /* necessary for a valid ms_info.addr */
578 if (ms_info.xa_flag)
579#endif
580 vol_desc_start = ms_info.addr.lba;
581 }
582 }
583
584 return vol_desc_start;
585}
586
587/*
588 * Check if root directory is empty (has less than 3 files).
589 *
590 * Used to detect broken CDs where ISO root directory is empty but Joliet root
591 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
592 * (and Joliet used instead) or else no files would be visible.
593 */
594static bool rootdir_empty(struct super_block *sb, unsigned long block)
595{
596 int offset = 0, files = 0, de_len;
597 struct iso_directory_record *de;
598 struct buffer_head *bh;
599
600 bh = sb_bread(sb, block);
601 if (!bh)
602 return true;
603 while (files < 3) {
604 de = (struct iso_directory_record *) (bh->b_data + offset);
605 de_len = *(unsigned char *) de;
606 if (de_len == 0)
607 break;
608 files++;
609 offset += de_len;
610 }
611 brelse(bh);
612 return files < 3;
613}
614
615/*
616 * Initialize the superblock and read the root inode.
617 */
618static int isofs_fill_super(struct super_block *s, void *data, int silent)
619{
620 struct buffer_head *bh = NULL, *pri_bh = NULL;
621 struct hs_primary_descriptor *h_pri = NULL;
622 struct iso_primary_descriptor *pri = NULL;
623 struct iso_supplementary_descriptor *sec = NULL;
624 struct iso_directory_record *rootp;
625 struct inode *inode;
626 struct iso9660_options opt;
627 struct isofs_sb_info *sbi;
628 unsigned long first_data_zone;
629 int joliet_level = 0;
630 int iso_blknum, block;
631 int orig_zonesize;
632 int table, error = -EINVAL;
633 unsigned int vol_desc_start;
634
635 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
636 if (!sbi)
637 return -ENOMEM;
638 s->s_fs_info = sbi;
639
640 if (!parse_options((char *)data, &opt))
641 goto out_freesbi;
642
643 /*
644 * First of all, get the hardware blocksize for this device.
645 * If we don't know what it is, or the hardware blocksize is
646 * larger than the blocksize the user specified, then use
647 * that value.
648 */
649 /*
650 * What if bugger tells us to go beyond page size?
651 */
652 if (bdev_logical_block_size(s->s_bdev) > 2048) {
653 printk(KERN_WARNING
654 "ISOFS: unsupported/invalid hardware sector size %d\n",
655 bdev_logical_block_size(s->s_bdev));
656 goto out_freesbi;
657 }
658 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
659
660 sbi->s_high_sierra = 0; /* default is iso9660 */
661 sbi->s_session = opt.session;
662 sbi->s_sbsector = opt.sbsector;
663
664 vol_desc_start = (opt.sbsector != -1) ?
665 opt.sbsector : isofs_get_last_session(s,opt.session);
666
667 for (iso_blknum = vol_desc_start+16;
668 iso_blknum < vol_desc_start+100; iso_blknum++) {
669 struct hs_volume_descriptor *hdp;
670 struct iso_volume_descriptor *vdp;
671
672 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
673 if (!(bh = sb_bread(s, block)))
674 goto out_no_read;
675
676 vdp = (struct iso_volume_descriptor *)bh->b_data;
677 hdp = (struct hs_volume_descriptor *)bh->b_data;
678
679 /*
680 * Due to the overlapping physical location of the descriptors,
681 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
682 * proper identification in this case, we first check for ISO.
683 */
684 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
685 if (isonum_711(vdp->type) == ISO_VD_END)
686 break;
687 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
688 if (!pri) {
689 pri = (struct iso_primary_descriptor *)vdp;
690 /* Save the buffer in case we need it ... */
691 pri_bh = bh;
692 bh = NULL;
693 }
694 }
695#ifdef CONFIG_JOLIET
696 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
697 sec = (struct iso_supplementary_descriptor *)vdp;
698 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
699 if (opt.joliet) {
700 if (sec->escape[2] == 0x40)
701 joliet_level = 1;
702 else if (sec->escape[2] == 0x43)
703 joliet_level = 2;
704 else if (sec->escape[2] == 0x45)
705 joliet_level = 3;
706
707 printk(KERN_DEBUG "ISO 9660 Extensions: "
708 "Microsoft Joliet Level %d\n",
709 joliet_level);
710 }
711 goto root_found;
712 } else {
713 /* Unknown supplementary volume descriptor */
714 sec = NULL;
715 }
716 }
717#endif
718 } else {
719 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
720 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
721 goto out_freebh;
722
723 sbi->s_high_sierra = 1;
724 opt.rock = 0;
725 h_pri = (struct hs_primary_descriptor *)vdp;
726 goto root_found;
727 }
728 }
729
730 /* Just skip any volume descriptors we don't recognize */
731
732 brelse(bh);
733 bh = NULL;
734 }
735 /*
736 * If we fall through, either no volume descriptor was found,
737 * or else we passed a primary descriptor looking for others.
738 */
739 if (!pri)
740 goto out_unknown_format;
741 brelse(bh);
742 bh = pri_bh;
743 pri_bh = NULL;
744
745root_found:
746 /* We don't support read-write mounts */
747 if (!sb_rdonly(s)) {
748 error = -EACCES;
749 goto out_freebh;
750 }
751
752 if (joliet_level && (!pri || !opt.rock)) {
753 /* This is the case of Joliet with the norock mount flag.
754 * A disc with both Joliet and Rock Ridge is handled later
755 */
756 pri = (struct iso_primary_descriptor *) sec;
757 }
758
759 if(sbi->s_high_sierra){
760 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
761 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
762 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
763 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
764 } else {
765 if (!pri)
766 goto out_freebh;
767 rootp = (struct iso_directory_record *) pri->root_directory_record;
768 sbi->s_nzones = isonum_733(pri->volume_space_size);
769 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
770 sbi->s_max_size = isonum_733(pri->volume_space_size);
771 }
772
773 sbi->s_ninodes = 0; /* No way to figure this out easily */
774
775 orig_zonesize = sbi->s_log_zone_size;
776 /*
777 * If the zone size is smaller than the hardware sector size,
778 * this is a fatal error. This would occur if the disc drive
779 * had sectors that were 2048 bytes, but the filesystem had
780 * blocks that were 512 bytes (which should only very rarely
781 * happen.)
782 */
783 if (orig_zonesize < opt.blocksize)
784 goto out_bad_size;
785
786 /* RDE: convert log zone size to bit shift */
787 switch (sbi->s_log_zone_size) {
788 case 512: sbi->s_log_zone_size = 9; break;
789 case 1024: sbi->s_log_zone_size = 10; break;
790 case 2048: sbi->s_log_zone_size = 11; break;
791
792 default:
793 goto out_bad_zone_size;
794 }
795
796 s->s_magic = ISOFS_SUPER_MAGIC;
797
798 /*
799 * With multi-extent files, file size is only limited by the maximum
800 * size of a file system, which is 8 TB.
801 */
802 s->s_maxbytes = 0x80000000000LL;
803
804 /* ECMA-119 timestamp from 1900/1/1 with tz offset */
805 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
806 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
807
808 /* Set this for reference. Its not currently used except on write
809 which we don't have .. */
810
811 first_data_zone = isonum_733(rootp->extent) +
812 isonum_711(rootp->ext_attr_length);
813 sbi->s_firstdatazone = first_data_zone;
814#ifndef BEQUIET
815 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
816 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
817 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
818 if(sbi->s_high_sierra)
819 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
820#endif
821
822 /*
823 * If the Joliet level is set, we _may_ decide to use the
824 * secondary descriptor, but can't be sure until after we
825 * read the root inode. But before reading the root inode
826 * we may need to change the device blocksize, and would
827 * rather release the old buffer first. So, we cache the
828 * first_data_zone value from the secondary descriptor.
829 */
830 if (joliet_level) {
831 pri = (struct iso_primary_descriptor *) sec;
832 rootp = (struct iso_directory_record *)
833 pri->root_directory_record;
834 first_data_zone = isonum_733(rootp->extent) +
835 isonum_711(rootp->ext_attr_length);
836 }
837
838 /*
839 * We're all done using the volume descriptor, and may need
840 * to change the device blocksize, so release the buffer now.
841 */
842 brelse(pri_bh);
843 brelse(bh);
844
845 /*
846 * Force the blocksize to 512 for 512 byte sectors. The file
847 * read primitives really get it wrong in a bad way if we don't
848 * do this.
849 *
850 * Note - we should never be setting the blocksize to something
851 * less than the hardware sector size for the device. If we
852 * do, we would end up having to read larger buffers and split
853 * out portions to satisfy requests.
854 *
855 * Note2- the idea here is that we want to deal with the optimal
856 * zonesize in the filesystem. If we have it set to something less,
857 * then we have horrible problems with trying to piece together
858 * bits of adjacent blocks in order to properly read directory
859 * entries. By forcing the blocksize in this way, we ensure
860 * that we will never be required to do this.
861 */
862 sb_set_blocksize(s, orig_zonesize);
863
864 sbi->s_nls_iocharset = NULL;
865
866#ifdef CONFIG_JOLIET
867 if (joliet_level) {
868 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
869 if (strcmp(p, "utf8") != 0) {
870 sbi->s_nls_iocharset = opt.iocharset ?
871 load_nls(opt.iocharset) : load_nls_default();
872 if (!sbi->s_nls_iocharset)
873 goto out_freesbi;
874 }
875 }
876#endif
877 s->s_op = &isofs_sops;
878 s->s_export_op = &isofs_export_ops;
879 sbi->s_mapping = opt.map;
880 sbi->s_rock = (opt.rock ? 2 : 0);
881 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
882 sbi->s_cruft = opt.cruft;
883 sbi->s_hide = opt.hide;
884 sbi->s_showassoc = opt.showassoc;
885 sbi->s_uid = opt.uid;
886 sbi->s_gid = opt.gid;
887 sbi->s_uid_set = opt.uid_set;
888 sbi->s_gid_set = opt.gid_set;
889 sbi->s_nocompress = opt.nocompress;
890 sbi->s_overriderockperm = opt.overriderockperm;
891 /*
892 * It would be incredibly stupid to allow people to mark every file
893 * on the disk as suid, so we merely allow them to set the default
894 * permissions.
895 */
896 if (opt.fmode != ISOFS_INVALID_MODE)
897 sbi->s_fmode = opt.fmode & 0777;
898 else
899 sbi->s_fmode = ISOFS_INVALID_MODE;
900 if (opt.dmode != ISOFS_INVALID_MODE)
901 sbi->s_dmode = opt.dmode & 0777;
902 else
903 sbi->s_dmode = ISOFS_INVALID_MODE;
904
905 /*
906 * Read the root inode, which _may_ result in changing
907 * the s_rock flag. Once we have the final s_rock value,
908 * we then decide whether to use the Joliet descriptor.
909 */
910 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
911 if (IS_ERR(inode))
912 goto out_no_root;
913
914 /*
915 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
916 * correct Joliet root directory.
917 */
918 if (sbi->s_rock == 1 && joliet_level &&
919 rootdir_empty(s, sbi->s_firstdatazone)) {
920 printk(KERN_NOTICE
921 "ISOFS: primary root directory is empty. "
922 "Disabling Rock Ridge and switching to Joliet.");
923 sbi->s_rock = 0;
924 }
925
926 /*
927 * If this disk has both Rock Ridge and Joliet on it, then we
928 * want to use Rock Ridge by default. This can be overridden
929 * by using the norock mount option. There is still one other
930 * possibility that is not taken into account: a Rock Ridge
931 * CD with Unicode names. Until someone sees such a beast, it
932 * will not be supported.
933 */
934 if (sbi->s_rock == 1) {
935 joliet_level = 0;
936 } else if (joliet_level) {
937 sbi->s_rock = 0;
938 if (sbi->s_firstdatazone != first_data_zone) {
939 sbi->s_firstdatazone = first_data_zone;
940 printk(KERN_DEBUG
941 "ISOFS: changing to secondary root\n");
942 iput(inode);
943 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
944 if (IS_ERR(inode))
945 goto out_no_root;
946 }
947 }
948
949 if (opt.check == 'u') {
950 /* Only Joliet is case insensitive by default */
951 if (joliet_level)
952 opt.check = 'r';
953 else
954 opt.check = 's';
955 }
956 sbi->s_joliet_level = joliet_level;
957
958 /* Make sure the root inode is a directory */
959 if (!S_ISDIR(inode->i_mode)) {
960 printk(KERN_WARNING
961 "isofs_fill_super: root inode is not a directory. "
962 "Corrupted media?\n");
963 goto out_iput;
964 }
965
966 table = 0;
967 if (joliet_level)
968 table += 2;
969 if (opt.check == 'r')
970 table++;
971 sbi->s_check = opt.check;
972
973 if (table)
974 s->s_d_op = &isofs_dentry_ops[table - 1];
975
976 /* get the root dentry */
977 s->s_root = d_make_root(inode);
978 if (!(s->s_root)) {
979 error = -ENOMEM;
980 goto out_no_inode;
981 }
982
983 kfree(opt.iocharset);
984
985 return 0;
986
987 /*
988 * Display error messages and free resources.
989 */
990out_iput:
991 iput(inode);
992 goto out_no_inode;
993out_no_root:
994 error = PTR_ERR(inode);
995 if (error != -ENOMEM)
996 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
997out_no_inode:
998#ifdef CONFIG_JOLIET
999 unload_nls(sbi->s_nls_iocharset);
1000#endif
1001 goto out_freesbi;
1002out_no_read:
1003 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1004 __func__, s->s_id, iso_blknum, block);
1005 goto out_freebh;
1006out_bad_zone_size:
1007 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1008 sbi->s_log_zone_size);
1009 goto out_freebh;
1010out_bad_size:
1011 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1012 orig_zonesize, opt.blocksize);
1013 goto out_freebh;
1014out_unknown_format:
1015 if (!silent)
1016 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1017
1018out_freebh:
1019 brelse(bh);
1020 brelse(pri_bh);
1021out_freesbi:
1022 kfree(opt.iocharset);
1023 kfree(sbi);
1024 s->s_fs_info = NULL;
1025 return error;
1026}
1027
1028static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1029{
1030 struct super_block *sb = dentry->d_sb;
1031 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1032
1033 buf->f_type = ISOFS_SUPER_MAGIC;
1034 buf->f_bsize = sb->s_blocksize;
1035 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1036 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1037 buf->f_bfree = 0;
1038 buf->f_bavail = 0;
1039 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1040 buf->f_ffree = 0;
1041 buf->f_fsid = u64_to_fsid(id);
1042 buf->f_namelen = NAME_MAX;
1043 return 0;
1044}
1045
1046/*
1047 * Get a set of blocks; filling in buffer_heads if already allocated
1048 * or getblk() if they are not. Returns the number of blocks inserted
1049 * (-ve == error.)
1050 */
1051int isofs_get_blocks(struct inode *inode, sector_t iblock,
1052 struct buffer_head **bh, unsigned long nblocks)
1053{
1054 unsigned long b_off = iblock;
1055 unsigned offset, sect_size;
1056 unsigned int firstext;
1057 unsigned long nextblk, nextoff;
1058 int section, rv, error;
1059 struct iso_inode_info *ei = ISOFS_I(inode);
1060
1061 error = -EIO;
1062 rv = 0;
1063 if (iblock != b_off) {
1064 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1065 goto abort;
1066 }
1067
1068
1069 offset = 0;
1070 firstext = ei->i_first_extent;
1071 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1072 nextblk = ei->i_next_section_block;
1073 nextoff = ei->i_next_section_offset;
1074 section = 0;
1075
1076 while (nblocks) {
1077 /* If we are *way* beyond the end of the file, print a message.
1078 * Access beyond the end of the file up to the next page boundary
1079 * is normal, however because of the way the page cache works.
1080 * In this case, we just return 0 so that we can properly fill
1081 * the page with useless information without generating any
1082 * I/O errors.
1083 */
1084 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1085 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1086 __func__, b_off,
1087 (unsigned long long)inode->i_size);
1088 goto abort;
1089 }
1090
1091 /* On the last section, nextblk == 0, section size is likely to
1092 * exceed sect_size by a partial block, and access beyond the
1093 * end of the file will reach beyond the section size, too.
1094 */
1095 while (nextblk && (b_off >= (offset + sect_size))) {
1096 struct inode *ninode;
1097
1098 offset += sect_size;
1099 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1100 if (IS_ERR(ninode)) {
1101 error = PTR_ERR(ninode);
1102 goto abort;
1103 }
1104 firstext = ISOFS_I(ninode)->i_first_extent;
1105 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1106 nextblk = ISOFS_I(ninode)->i_next_section_block;
1107 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1108 iput(ninode);
1109
1110 if (++section > 100) {
1111 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1112 " aborting...\n", __func__);
1113 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1114 "nextblk=%lu nextoff=%lu\n", __func__,
1115 b_off, firstext, (unsigned) sect_size,
1116 nextblk, nextoff);
1117 goto abort;
1118 }
1119 }
1120
1121 if (*bh) {
1122 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1123 } else {
1124 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1125 if (!*bh)
1126 goto abort;
1127 }
1128 bh++; /* Next buffer head */
1129 b_off++; /* Next buffer offset */
1130 nblocks--;
1131 rv++;
1132 }
1133
1134 error = 0;
1135abort:
1136 return rv != 0 ? rv : error;
1137}
1138
1139/*
1140 * Used by the standard interfaces.
1141 */
1142static int isofs_get_block(struct inode *inode, sector_t iblock,
1143 struct buffer_head *bh_result, int create)
1144{
1145 int ret;
1146
1147 if (create) {
1148 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1149 return -EROFS;
1150 }
1151
1152 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1153 return ret < 0 ? ret : 0;
1154}
1155
1156static int isofs_bmap(struct inode *inode, sector_t block)
1157{
1158 struct buffer_head dummy;
1159 int error;
1160
1161 dummy.b_state = 0;
1162 dummy.b_blocknr = -1000;
1163 error = isofs_get_block(inode, block, &dummy, 0);
1164 if (!error)
1165 return dummy.b_blocknr;
1166 return 0;
1167}
1168
1169struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1170{
1171 sector_t blknr = isofs_bmap(inode, block);
1172 if (!blknr)
1173 return NULL;
1174 return sb_bread(inode->i_sb, blknr);
1175}
1176
1177static int isofs_read_folio(struct file *file, struct folio *folio)
1178{
1179 return mpage_read_folio(folio, isofs_get_block);
1180}
1181
1182static void isofs_readahead(struct readahead_control *rac)
1183{
1184 mpage_readahead(rac, isofs_get_block);
1185}
1186
1187static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1188{
1189 return generic_block_bmap(mapping,block,isofs_get_block);
1190}
1191
1192static const struct address_space_operations isofs_aops = {
1193 .read_folio = isofs_read_folio,
1194 .readahead = isofs_readahead,
1195 .bmap = _isofs_bmap
1196};
1197
1198static int isofs_read_level3_size(struct inode *inode)
1199{
1200 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1201 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1202 struct buffer_head *bh = NULL;
1203 unsigned long block, offset, block_saved, offset_saved;
1204 int i = 0;
1205 int more_entries = 0;
1206 struct iso_directory_record *tmpde = NULL;
1207 struct iso_inode_info *ei = ISOFS_I(inode);
1208
1209 inode->i_size = 0;
1210
1211 /* The first 16 blocks are reserved as the System Area. Thus,
1212 * no inodes can appear in block 0. We use this to flag that
1213 * this is the last section. */
1214 ei->i_next_section_block = 0;
1215 ei->i_next_section_offset = 0;
1216
1217 block = ei->i_iget5_block;
1218 offset = ei->i_iget5_offset;
1219
1220 do {
1221 struct iso_directory_record *de;
1222 unsigned int de_len;
1223
1224 if (!bh) {
1225 bh = sb_bread(inode->i_sb, block);
1226 if (!bh)
1227 goto out_noread;
1228 }
1229 de = (struct iso_directory_record *) (bh->b_data + offset);
1230 de_len = *(unsigned char *) de;
1231
1232 if (de_len == 0) {
1233 brelse(bh);
1234 bh = NULL;
1235 ++block;
1236 offset = 0;
1237 continue;
1238 }
1239
1240 block_saved = block;
1241 offset_saved = offset;
1242 offset += de_len;
1243
1244 /* Make sure we have a full directory entry */
1245 if (offset >= bufsize) {
1246 int slop = bufsize - offset + de_len;
1247 if (!tmpde) {
1248 tmpde = kmalloc(256, GFP_KERNEL);
1249 if (!tmpde)
1250 goto out_nomem;
1251 }
1252 memcpy(tmpde, de, slop);
1253 offset &= bufsize - 1;
1254 block++;
1255 brelse(bh);
1256 bh = NULL;
1257 if (offset) {
1258 bh = sb_bread(inode->i_sb, block);
1259 if (!bh)
1260 goto out_noread;
1261 memcpy((void *)tmpde+slop, bh->b_data, offset);
1262 }
1263 de = tmpde;
1264 }
1265
1266 inode->i_size += isonum_733(de->size);
1267 if (i == 1) {
1268 ei->i_next_section_block = block_saved;
1269 ei->i_next_section_offset = offset_saved;
1270 }
1271
1272 more_entries = de->flags[-high_sierra] & 0x80;
1273
1274 i++;
1275 if (i > 100)
1276 goto out_toomany;
1277 } while (more_entries);
1278out:
1279 kfree(tmpde);
1280 brelse(bh);
1281 return 0;
1282
1283out_nomem:
1284 brelse(bh);
1285 return -ENOMEM;
1286
1287out_noread:
1288 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1289 kfree(tmpde);
1290 return -EIO;
1291
1292out_toomany:
1293 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1294 "isofs_read_level3_size: inode=%lu\n",
1295 __func__, inode->i_ino);
1296 goto out;
1297}
1298
1299static int isofs_read_inode(struct inode *inode, int relocated)
1300{
1301 struct super_block *sb = inode->i_sb;
1302 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1303 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1304 unsigned long block;
1305 int high_sierra = sbi->s_high_sierra;
1306 struct buffer_head *bh;
1307 struct iso_directory_record *de;
1308 struct iso_directory_record *tmpde = NULL;
1309 unsigned int de_len;
1310 unsigned long offset;
1311 struct iso_inode_info *ei = ISOFS_I(inode);
1312 int ret = -EIO;
1313
1314 block = ei->i_iget5_block;
1315 bh = sb_bread(inode->i_sb, block);
1316 if (!bh)
1317 goto out_badread;
1318
1319 offset = ei->i_iget5_offset;
1320
1321 de = (struct iso_directory_record *) (bh->b_data + offset);
1322 de_len = *(unsigned char *) de;
1323 if (de_len < sizeof(struct iso_directory_record))
1324 goto fail;
1325
1326 if (offset + de_len > bufsize) {
1327 int frag1 = bufsize - offset;
1328
1329 tmpde = kmalloc(de_len, GFP_KERNEL);
1330 if (!tmpde) {
1331 ret = -ENOMEM;
1332 goto fail;
1333 }
1334 memcpy(tmpde, bh->b_data + offset, frag1);
1335 brelse(bh);
1336 bh = sb_bread(inode->i_sb, ++block);
1337 if (!bh)
1338 goto out_badread;
1339 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1340 de = tmpde;
1341 }
1342
1343 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1344 ei->i_iget5_offset,
1345 ISOFS_BUFFER_BITS(inode));
1346
1347 /* Assume it is a normal-format file unless told otherwise */
1348 ei->i_file_format = isofs_file_normal;
1349
1350 if (de->flags[-high_sierra] & 2) {
1351 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1352 inode->i_mode = S_IFDIR | sbi->s_dmode;
1353 else
1354 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1355 set_nlink(inode, 1); /*
1356 * Set to 1. We know there are 2, but
1357 * the find utility tries to optimize
1358 * if it is 2, and it screws up. It is
1359 * easier to give 1 which tells find to
1360 * do it the hard way.
1361 */
1362 } else {
1363 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1364 inode->i_mode = S_IFREG | sbi->s_fmode;
1365 } else {
1366 /*
1367 * Set default permissions: r-x for all. The disc
1368 * could be shared with DOS machines so virtually
1369 * anything could be a valid executable.
1370 */
1371 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1372 }
1373 set_nlink(inode, 1);
1374 }
1375 inode->i_uid = sbi->s_uid;
1376 inode->i_gid = sbi->s_gid;
1377 inode->i_blocks = 0;
1378
1379 ei->i_format_parm[0] = 0;
1380 ei->i_format_parm[1] = 0;
1381 ei->i_format_parm[2] = 0;
1382
1383 ei->i_section_size = isonum_733(de->size);
1384 if (de->flags[-high_sierra] & 0x80) {
1385 ret = isofs_read_level3_size(inode);
1386 if (ret < 0)
1387 goto fail;
1388 ret = -EIO;
1389 } else {
1390 ei->i_next_section_block = 0;
1391 ei->i_next_section_offset = 0;
1392 inode->i_size = isonum_733(de->size);
1393 }
1394
1395 /*
1396 * Some dipshit decided to store some other bit of information
1397 * in the high byte of the file length. Truncate size in case
1398 * this CDROM was mounted with the cruft option.
1399 */
1400
1401 if (sbi->s_cruft)
1402 inode->i_size &= 0x00ffffff;
1403
1404 if (de->interleave[0]) {
1405 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1406 inode->i_size = 0;
1407 }
1408
1409 /* I have no idea what file_unit_size is used for, so
1410 we will flag it for now */
1411 if (de->file_unit_size[0] != 0) {
1412 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1413 inode->i_ino);
1414 }
1415
1416 /* I have no idea what other flag bits are used for, so
1417 we will flag it for now */
1418#ifdef DEBUG
1419 if((de->flags[-high_sierra] & ~2)!= 0){
1420 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1421 "(%ld %x).\n",
1422 inode->i_ino, de->flags[-high_sierra]);
1423 }
1424#endif
1425
1426 inode->i_mtime.tv_sec =
1427 inode->i_atime.tv_sec =
1428 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1429 inode->i_mtime.tv_nsec =
1430 inode->i_atime.tv_nsec =
1431 inode->i_ctime.tv_nsec = 0;
1432
1433 ei->i_first_extent = (isonum_733(de->extent) +
1434 isonum_711(de->ext_attr_length));
1435
1436 /* Set the number of blocks for stat() - should be done before RR */
1437 inode->i_blocks = (inode->i_size + 511) >> 9;
1438
1439 /*
1440 * Now test for possible Rock Ridge extensions which will override
1441 * some of these numbers in the inode structure.
1442 */
1443
1444 if (!high_sierra) {
1445 parse_rock_ridge_inode(de, inode, relocated);
1446 /* if we want uid/gid set, override the rock ridge setting */
1447 if (sbi->s_uid_set)
1448 inode->i_uid = sbi->s_uid;
1449 if (sbi->s_gid_set)
1450 inode->i_gid = sbi->s_gid;
1451 }
1452 /* Now set final access rights if overriding rock ridge setting */
1453 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1454 sbi->s_dmode != ISOFS_INVALID_MODE)
1455 inode->i_mode = S_IFDIR | sbi->s_dmode;
1456 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1457 sbi->s_fmode != ISOFS_INVALID_MODE)
1458 inode->i_mode = S_IFREG | sbi->s_fmode;
1459
1460 /* Install the inode operations vector */
1461 if (S_ISREG(inode->i_mode)) {
1462 inode->i_fop = &generic_ro_fops;
1463 switch (ei->i_file_format) {
1464#ifdef CONFIG_ZISOFS
1465 case isofs_file_compressed:
1466 inode->i_data.a_ops = &zisofs_aops;
1467 break;
1468#endif
1469 default:
1470 inode->i_data.a_ops = &isofs_aops;
1471 break;
1472 }
1473 } else if (S_ISDIR(inode->i_mode)) {
1474 inode->i_op = &isofs_dir_inode_operations;
1475 inode->i_fop = &isofs_dir_operations;
1476 } else if (S_ISLNK(inode->i_mode)) {
1477 inode->i_op = &page_symlink_inode_operations;
1478 inode_nohighmem(inode);
1479 inode->i_data.a_ops = &isofs_symlink_aops;
1480 } else
1481 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1482 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1483
1484 ret = 0;
1485out:
1486 kfree(tmpde);
1487 brelse(bh);
1488 return ret;
1489
1490out_badread:
1491 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1492fail:
1493 goto out;
1494}
1495
1496struct isofs_iget5_callback_data {
1497 unsigned long block;
1498 unsigned long offset;
1499};
1500
1501static int isofs_iget5_test(struct inode *ino, void *data)
1502{
1503 struct iso_inode_info *i = ISOFS_I(ino);
1504 struct isofs_iget5_callback_data *d =
1505 (struct isofs_iget5_callback_data*)data;
1506 return (i->i_iget5_block == d->block)
1507 && (i->i_iget5_offset == d->offset);
1508}
1509
1510static int isofs_iget5_set(struct inode *ino, void *data)
1511{
1512 struct iso_inode_info *i = ISOFS_I(ino);
1513 struct isofs_iget5_callback_data *d =
1514 (struct isofs_iget5_callback_data*)data;
1515 i->i_iget5_block = d->block;
1516 i->i_iget5_offset = d->offset;
1517 return 0;
1518}
1519
1520/* Store, in the inode's containing structure, the block and block
1521 * offset that point to the underlying meta-data for the inode. The
1522 * code below is otherwise similar to the iget() code in
1523 * include/linux/fs.h */
1524struct inode *__isofs_iget(struct super_block *sb,
1525 unsigned long block,
1526 unsigned long offset,
1527 int relocated)
1528{
1529 unsigned long hashval;
1530 struct inode *inode;
1531 struct isofs_iget5_callback_data data;
1532 long ret;
1533
1534 if (offset >= 1ul << sb->s_blocksize_bits)
1535 return ERR_PTR(-EINVAL);
1536
1537 data.block = block;
1538 data.offset = offset;
1539
1540 hashval = (block << sb->s_blocksize_bits) | offset;
1541
1542 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1543 &isofs_iget5_set, &data);
1544
1545 if (!inode)
1546 return ERR_PTR(-ENOMEM);
1547
1548 if (inode->i_state & I_NEW) {
1549 ret = isofs_read_inode(inode, relocated);
1550 if (ret < 0) {
1551 iget_failed(inode);
1552 inode = ERR_PTR(ret);
1553 } else {
1554 unlock_new_inode(inode);
1555 }
1556 }
1557
1558 return inode;
1559}
1560
1561static struct dentry *isofs_mount(struct file_system_type *fs_type,
1562 int flags, const char *dev_name, void *data)
1563{
1564 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1565}
1566
1567static struct file_system_type iso9660_fs_type = {
1568 .owner = THIS_MODULE,
1569 .name = "iso9660",
1570 .mount = isofs_mount,
1571 .kill_sb = kill_block_super,
1572 .fs_flags = FS_REQUIRES_DEV,
1573};
1574MODULE_ALIAS_FS("iso9660");
1575MODULE_ALIAS("iso9660");
1576
1577static int __init init_iso9660_fs(void)
1578{
1579 int err = init_inodecache();
1580 if (err)
1581 goto out;
1582#ifdef CONFIG_ZISOFS
1583 err = zisofs_init();
1584 if (err)
1585 goto out1;
1586#endif
1587 err = register_filesystem(&iso9660_fs_type);
1588 if (err)
1589 goto out2;
1590 return 0;
1591out2:
1592#ifdef CONFIG_ZISOFS
1593 zisofs_cleanup();
1594out1:
1595#endif
1596 destroy_inodecache();
1597out:
1598 return err;
1599}
1600
1601static void __exit exit_iso9660_fs(void)
1602{
1603 unregister_filesystem(&iso9660_fs_type);
1604#ifdef CONFIG_ZISOFS
1605 zisofs_cleanup();
1606#endif
1607 destroy_inodecache();
1608}
1609
1610module_init(init_iso9660_fs)
1611module_exit(exit_iso9660_fs)
1612MODULE_LICENSE("GPL");