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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 inode_set_mtime_to_ts(inode,
1426 inode_set_atime_to_ts(inode, inode_set_ctime(inode, iso_date(de->date, high_sierra), 0)));
1427
1428 ei->i_first_extent = (isonum_733(de->extent) +
1429 isonum_711(de->ext_attr_length));
1430
1431 /* Set the number of blocks for stat() - should be done before RR */
1432 inode->i_blocks = (inode->i_size + 511) >> 9;
1433
1434 /*
1435 * Now test for possible Rock Ridge extensions which will override
1436 * some of these numbers in the inode structure.
1437 */
1438
1439 if (!high_sierra) {
1440 parse_rock_ridge_inode(de, inode, relocated);
1441 /* if we want uid/gid set, override the rock ridge setting */
1442 if (sbi->s_uid_set)
1443 inode->i_uid = sbi->s_uid;
1444 if (sbi->s_gid_set)
1445 inode->i_gid = sbi->s_gid;
1446 }
1447 /* Now set final access rights if overriding rock ridge setting */
1448 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1449 sbi->s_dmode != ISOFS_INVALID_MODE)
1450 inode->i_mode = S_IFDIR | sbi->s_dmode;
1451 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1452 sbi->s_fmode != ISOFS_INVALID_MODE)
1453 inode->i_mode = S_IFREG | sbi->s_fmode;
1454
1455 /* Install the inode operations vector */
1456 if (S_ISREG(inode->i_mode)) {
1457 inode->i_fop = &generic_ro_fops;
1458 switch (ei->i_file_format) {
1459#ifdef CONFIG_ZISOFS
1460 case isofs_file_compressed:
1461 inode->i_data.a_ops = &zisofs_aops;
1462 break;
1463#endif
1464 default:
1465 inode->i_data.a_ops = &isofs_aops;
1466 break;
1467 }
1468 } else if (S_ISDIR(inode->i_mode)) {
1469 inode->i_op = &isofs_dir_inode_operations;
1470 inode->i_fop = &isofs_dir_operations;
1471 } else if (S_ISLNK(inode->i_mode)) {
1472 inode->i_op = &page_symlink_inode_operations;
1473 inode_nohighmem(inode);
1474 inode->i_data.a_ops = &isofs_symlink_aops;
1475 } else
1476 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1477 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1478
1479 ret = 0;
1480out:
1481 kfree(tmpde);
1482 brelse(bh);
1483 return ret;
1484
1485out_badread:
1486 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1487fail:
1488 goto out;
1489}
1490
1491struct isofs_iget5_callback_data {
1492 unsigned long block;
1493 unsigned long offset;
1494};
1495
1496static int isofs_iget5_test(struct inode *ino, void *data)
1497{
1498 struct iso_inode_info *i = ISOFS_I(ino);
1499 struct isofs_iget5_callback_data *d =
1500 (struct isofs_iget5_callback_data*)data;
1501 return (i->i_iget5_block == d->block)
1502 && (i->i_iget5_offset == d->offset);
1503}
1504
1505static int isofs_iget5_set(struct inode *ino, void *data)
1506{
1507 struct iso_inode_info *i = ISOFS_I(ino);
1508 struct isofs_iget5_callback_data *d =
1509 (struct isofs_iget5_callback_data*)data;
1510 i->i_iget5_block = d->block;
1511 i->i_iget5_offset = d->offset;
1512 return 0;
1513}
1514
1515/* Store, in the inode's containing structure, the block and block
1516 * offset that point to the underlying meta-data for the inode. The
1517 * code below is otherwise similar to the iget() code in
1518 * include/linux/fs.h */
1519struct inode *__isofs_iget(struct super_block *sb,
1520 unsigned long block,
1521 unsigned long offset,
1522 int relocated)
1523{
1524 unsigned long hashval;
1525 struct inode *inode;
1526 struct isofs_iget5_callback_data data;
1527 long ret;
1528
1529 if (offset >= 1ul << sb->s_blocksize_bits)
1530 return ERR_PTR(-EINVAL);
1531
1532 data.block = block;
1533 data.offset = offset;
1534
1535 hashval = (block << sb->s_blocksize_bits) | offset;
1536
1537 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1538 &isofs_iget5_set, &data);
1539
1540 if (!inode)
1541 return ERR_PTR(-ENOMEM);
1542
1543 if (inode->i_state & I_NEW) {
1544 ret = isofs_read_inode(inode, relocated);
1545 if (ret < 0) {
1546 iget_failed(inode);
1547 inode = ERR_PTR(ret);
1548 } else {
1549 unlock_new_inode(inode);
1550 }
1551 }
1552
1553 return inode;
1554}
1555
1556static struct dentry *isofs_mount(struct file_system_type *fs_type,
1557 int flags, const char *dev_name, void *data)
1558{
1559 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1560}
1561
1562static struct file_system_type iso9660_fs_type = {
1563 .owner = THIS_MODULE,
1564 .name = "iso9660",
1565 .mount = isofs_mount,
1566 .kill_sb = kill_block_super,
1567 .fs_flags = FS_REQUIRES_DEV,
1568};
1569MODULE_ALIAS_FS("iso9660");
1570MODULE_ALIAS("iso9660");
1571
1572static int __init init_iso9660_fs(void)
1573{
1574 int err = init_inodecache();
1575 if (err)
1576 goto out;
1577#ifdef CONFIG_ZISOFS
1578 err = zisofs_init();
1579 if (err)
1580 goto out1;
1581#endif
1582 err = register_filesystem(&iso9660_fs_type);
1583 if (err)
1584 goto out2;
1585 return 0;
1586out2:
1587#ifdef CONFIG_ZISOFS
1588 zisofs_cleanup();
1589out1:
1590#endif
1591 destroy_inodecache();
1592out:
1593 return err;
1594}
1595
1596static void __exit exit_iso9660_fs(void)
1597{
1598 unregister_filesystem(&iso9660_fs_type);
1599#ifdef CONFIG_ZISOFS
1600 zisofs_cleanup();
1601#endif
1602 destroy_inodecache();
1603}
1604
1605module_init(init_iso9660_fs)
1606module_exit(exit_iso9660_fs)
1607MODULE_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");