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(objp: 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(s: isofs_inode_cachep, objp: 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(s: 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, prevhash: 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(s1: name->name, s2: str, n: 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, ms: 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, ms: 0, ci: 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(salt: 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, ms: 1);
268}
269
270static int
271isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
272{
273 return isofs_hashi_common(dentry, qstr, ms: 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, ms: 1, ci: 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, ms: 1, ci: 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, desc: isofs_param_spec, param, result: &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(objp: popt->iocharset);
377 popt->iocharset = kstrdup(s: "utf8", GFP_KERNEL);
378 if (!popt->iocharset)
379 return -ENOMEM;
380 break;
381 case Opt_iocharset:
382 kfree(objp: popt->iocharset);
383 popt->iocharset = kstrdup(s: 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(sb: root->d_sb);
447
448 if (!sbi->s_rock) seq_puts(m, s: ",norock");
449 else if (!sbi->s_joliet_level) seq_puts(m, s: ",nojoliet");
450 if (sbi->s_cruft) seq_puts(m, s: ",cruft");
451 if (sbi->s_hide) seq_puts(m, s: ",hide");
452 if (sbi->s_nocompress) seq_puts(m, s: ",nocompress");
453 if (sbi->s_overriderockperm) seq_puts(m, s: ",overriderockperm");
454 if (sbi->s_showassoc) seq_puts(m, s: ",showassoc");
455
456 if (sbi->s_check) seq_printf(m, fmt: ",check=%c", sbi->s_check);
457 if (sbi->s_mapping) seq_printf(m, fmt: ",map=%c", sbi->s_mapping);
458 if (sbi->s_session != 255) seq_printf(m, fmt: ",session=%u", sbi->s_session - 1);
459 if (sbi->s_sbsector != -1) seq_printf(m, fmt: ",sbsector=%u", sbi->s_sbsector);
460
461 if (root->d_sb->s_blocksize != 1024)
462 seq_printf(m, fmt: ",blocksize=%lu", root->d_sb->s_blocksize);
463
464 if (sbi->s_uid_set)
465 seq_printf(m, fmt: ",uid=%u",
466 from_kuid_munged(to: &init_user_ns, uid: sbi->s_uid));
467 if (sbi->s_gid_set)
468 seq_printf(m, fmt: ",gid=%u",
469 from_kgid_munged(to: &init_user_ns, gid: sbi->s_gid));
470
471 if (sbi->s_dmode != ISOFS_INVALID_MODE)
472 seq_printf(m, fmt: ",dmode=%o", sbi->s_dmode);
473 if (sbi->s_fmode != ISOFS_INVALID_MODE)
474 seq_printf(m, fmt: ",fmode=%o", sbi->s_fmode);
475
476#ifdef CONFIG_JOLIET
477 if (sbi->s_nls_iocharset)
478 seq_printf(m, fmt: ",iocharset=%s", sbi->s_nls_iocharset->charset);
479 else
480 seq_puts(m, s: ",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, entry: &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, info: &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(bdev: 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(sb: s, size: opt->blocksize);
613 if (!opt->blocksize) {
614 printk(KERN_ERR
615 "ISOFS: unable to set blocksize\n");
616 goto out_freesbi;
617 }
618
619 sbi->s_high_sierra = 0; /* default is iso9660 */
620 sbi->s_session = opt->session;
621 sbi->s_sbsector = opt->sbsector;
622
623 vol_desc_start = (opt->sbsector != -1) ?
624 opt->sbsector : isofs_get_last_session(sb: s, session: opt->session);
625
626 for (iso_blknum = vol_desc_start+16;
627 iso_blknum < vol_desc_start+100; iso_blknum++) {
628 struct hs_volume_descriptor *hdp;
629 struct iso_volume_descriptor *vdp;
630
631 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
632 if (!(bh = sb_bread(sb: s, block)))
633 goto out_no_read;
634
635 vdp = (struct iso_volume_descriptor *)bh->b_data;
636 hdp = (struct hs_volume_descriptor *)bh->b_data;
637
638 /*
639 * Due to the overlapping physical location of the descriptors,
640 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
641 * proper identification in this case, we first check for ISO.
642 */
643 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
644 if (isonum_711(p: vdp->type) == ISO_VD_END)
645 break;
646 if (isonum_711(p: vdp->type) == ISO_VD_PRIMARY) {
647 if (!pri) {
648 pri = (struct iso_primary_descriptor *)vdp;
649 /* Save the buffer in case we need it ... */
650 pri_bh = bh;
651 bh = NULL;
652 }
653 }
654#ifdef CONFIG_JOLIET
655 else if (isonum_711(p: vdp->type) == ISO_VD_SUPPLEMENTARY) {
656 sec = (struct iso_supplementary_descriptor *)vdp;
657 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
658 if (opt->joliet) {
659 if (sec->escape[2] == 0x40)
660 joliet_level = 1;
661 else if (sec->escape[2] == 0x43)
662 joliet_level = 2;
663 else if (sec->escape[2] == 0x45)
664 joliet_level = 3;
665
666 printk(KERN_DEBUG "ISO 9660 Extensions: "
667 "Microsoft Joliet Level %d\n",
668 joliet_level);
669 }
670 goto root_found;
671 } else {
672 /* Unknown supplementary volume descriptor */
673 sec = NULL;
674 }
675 }
676#endif
677 } else {
678 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
679 if (isonum_711(p: hdp->type) != ISO_VD_PRIMARY)
680 goto out_freebh;
681
682 sbi->s_high_sierra = 1;
683 opt->rock = 0;
684 h_pri = (struct hs_primary_descriptor *)vdp;
685 goto root_found;
686 }
687 }
688
689 /* Just skip any volume descriptors we don't recognize */
690
691 brelse(bh);
692 bh = NULL;
693 }
694 /*
695 * If we fall through, either no volume descriptor was found,
696 * or else we passed a primary descriptor looking for others.
697 */
698 if (!pri)
699 goto out_unknown_format;
700 brelse(bh);
701 bh = pri_bh;
702 pri_bh = NULL;
703
704root_found:
705 /* We don't support read-write mounts */
706 if (!sb_rdonly(sb: s)) {
707 error = -EACCES;
708 goto out_freebh;
709 }
710
711 if (joliet_level && (!pri || !opt->rock)) {
712 /* This is the case of Joliet with the norock mount flag.
713 * A disc with both Joliet and Rock Ridge is handled later
714 */
715 pri = (struct iso_primary_descriptor *) sec;
716 }
717
718 if(sbi->s_high_sierra){
719 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
720 sbi->s_nzones = isonum_733(p: h_pri->volume_space_size);
721 sbi->s_log_zone_size = isonum_723(p: h_pri->logical_block_size);
722 sbi->s_max_size = isonum_733(p: h_pri->volume_space_size);
723 } else {
724 if (!pri)
725 goto out_freebh;
726 rootp = (struct iso_directory_record *) pri->root_directory_record;
727 sbi->s_nzones = isonum_733(p: pri->volume_space_size);
728 sbi->s_log_zone_size = isonum_723(p: pri->logical_block_size);
729 sbi->s_max_size = isonum_733(p: pri->volume_space_size);
730 }
731
732 sbi->s_ninodes = 0; /* No way to figure this out easily */
733
734 orig_zonesize = sbi->s_log_zone_size;
735 /*
736 * If the zone size is smaller than the hardware sector size,
737 * this is a fatal error. This would occur if the disc drive
738 * had sectors that were 2048 bytes, but the filesystem had
739 * blocks that were 512 bytes (which should only very rarely
740 * happen.)
741 */
742 if (orig_zonesize < opt->blocksize)
743 goto out_bad_size;
744
745 /* RDE: convert log zone size to bit shift */
746 switch (sbi->s_log_zone_size) {
747 case 512: sbi->s_log_zone_size = 9; break;
748 case 1024: sbi->s_log_zone_size = 10; break;
749 case 2048: sbi->s_log_zone_size = 11; break;
750
751 default:
752 goto out_bad_zone_size;
753 }
754
755 s->s_magic = ISOFS_SUPER_MAGIC;
756
757 /*
758 * With multi-extent files, file size is only limited by the maximum
759 * size of a file system, which is 8 TB.
760 */
761 s->s_maxbytes = 0x80000000000LL;
762
763 /* ECMA-119 timestamp from 1900/1/1 with tz offset */
764 s->s_time_min = mktime64(year: 1900, mon: 1, day: 1, hour: 0, min: 0, sec: 0) - MAX_TZ_OFFSET;
765 s->s_time_max = mktime64(U8_MAX+1900, mon: 12, day: 31, hour: 23, min: 59, sec: 59) + MAX_TZ_OFFSET;
766
767 /* Set this for reference. Its not currently used except on write
768 which we don't have .. */
769
770 first_data_zone = isonum_733(p: rootp->extent) +
771 isonum_711(p: rootp->ext_attr_length);
772 sbi->s_firstdatazone = first_data_zone;
773#ifndef BEQUIET
774 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
775 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
776 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
777 if(sbi->s_high_sierra)
778 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
779#endif
780
781 /*
782 * If the Joliet level is set, we _may_ decide to use the
783 * secondary descriptor, but can't be sure until after we
784 * read the root inode. But before reading the root inode
785 * we may need to change the device blocksize, and would
786 * rather release the old buffer first. So, we cache the
787 * first_data_zone value from the secondary descriptor.
788 */
789 if (joliet_level) {
790 pri = (struct iso_primary_descriptor *) sec;
791 rootp = (struct iso_directory_record *)
792 pri->root_directory_record;
793 first_data_zone = isonum_733(p: rootp->extent) +
794 isonum_711(p: rootp->ext_attr_length);
795 }
796
797 /*
798 * We're all done using the volume descriptor, and may need
799 * to change the device blocksize, so release the buffer now.
800 */
801 brelse(bh: pri_bh);
802 brelse(bh);
803
804 /*
805 * Force the blocksize to 512 for 512 byte sectors. The file
806 * read primitives really get it wrong in a bad way if we don't
807 * do this.
808 *
809 * Note - we should never be setting the blocksize to something
810 * less than the hardware sector size for the device. If we
811 * do, we would end up having to read larger buffers and split
812 * out portions to satisfy requests.
813 *
814 * Note2- the idea here is that we want to deal with the optimal
815 * zonesize in the filesystem. If we have it set to something less,
816 * then we have horrible problems with trying to piece together
817 * bits of adjacent blocks in order to properly read directory
818 * entries. By forcing the blocksize in this way, we ensure
819 * that we will never be required to do this.
820 */
821 sb_set_blocksize(sb: s, size: orig_zonesize);
822
823 sbi->s_nls_iocharset = NULL;
824
825#ifdef CONFIG_JOLIET
826 if (joliet_level) {
827 char *p = opt->iocharset ? opt->iocharset : CONFIG_NLS_DEFAULT;
828 if (strcmp(p, "utf8") != 0) {
829 sbi->s_nls_iocharset = opt->iocharset ?
830 load_nls(charset: opt->iocharset) : load_nls_default();
831 if (!sbi->s_nls_iocharset)
832 goto out_freesbi;
833 }
834 }
835#endif
836 s->s_op = &isofs_sops;
837 s->s_export_op = &isofs_export_ops;
838 sbi->s_mapping = opt->map;
839 sbi->s_rock = (opt->rock ? 2 : 0);
840 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
841 sbi->s_cruft = opt->cruft;
842 sbi->s_hide = opt->hide;
843 sbi->s_showassoc = opt->showassoc;
844 sbi->s_uid = opt->uid;
845 sbi->s_gid = opt->gid;
846 sbi->s_uid_set = opt->uid_set;
847 sbi->s_gid_set = opt->gid_set;
848 sbi->s_nocompress = opt->nocompress;
849 sbi->s_overriderockperm = opt->overriderockperm;
850 /*
851 * It would be incredibly stupid to allow people to mark every file
852 * on the disk as suid, so we merely allow them to set the default
853 * permissions.
854 */
855 if (opt->fmode != ISOFS_INVALID_MODE)
856 sbi->s_fmode = opt->fmode & 0777;
857 else
858 sbi->s_fmode = ISOFS_INVALID_MODE;
859 if (opt->dmode != ISOFS_INVALID_MODE)
860 sbi->s_dmode = opt->dmode & 0777;
861 else
862 sbi->s_dmode = ISOFS_INVALID_MODE;
863
864 /*
865 * Read the root inode, which _may_ result in changing
866 * the s_rock flag. Once we have the final s_rock value,
867 * we then decide whether to use the Joliet descriptor.
868 */
869 inode = isofs_iget(sb: s, block: sbi->s_firstdatazone, offset: 0);
870
871 /*
872 * Fix for broken CDs with a corrupt root inode but a correct Joliet
873 * root directory.
874 */
875 if (IS_ERR(ptr: inode)) {
876 if (joliet_level && sbi->s_firstdatazone != first_data_zone) {
877 printk(KERN_NOTICE
878 "ISOFS: root inode is unusable. "
879 "Disabling Rock Ridge and switching to Joliet.");
880 sbi->s_rock = 0;
881 inode = NULL;
882 } else {
883 goto out_no_root;
884 }
885 }
886
887 /*
888 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
889 * correct Joliet root directory.
890 */
891 if (sbi->s_rock == 1 && joliet_level &&
892 rootdir_empty(sb: s, block: sbi->s_firstdatazone)) {
893 printk(KERN_NOTICE
894 "ISOFS: primary root directory is empty. "
895 "Disabling Rock Ridge and switching to Joliet.");
896 sbi->s_rock = 0;
897 }
898
899 /*
900 * If this disk has both Rock Ridge and Joliet on it, then we
901 * want to use Rock Ridge by default. This can be overridden
902 * by using the norock mount option. There is still one other
903 * possibility that is not taken into account: a Rock Ridge
904 * CD with Unicode names. Until someone sees such a beast, it
905 * will not be supported.
906 */
907 if (sbi->s_rock == 1) {
908 joliet_level = 0;
909 } else if (joliet_level) {
910 sbi->s_rock = 0;
911 if (sbi->s_firstdatazone != first_data_zone) {
912 sbi->s_firstdatazone = first_data_zone;
913 printk(KERN_DEBUG
914 "ISOFS: changing to secondary root\n");
915 iput(inode);
916 inode = isofs_iget(sb: s, block: sbi->s_firstdatazone, offset: 0);
917 if (IS_ERR(ptr: inode))
918 goto out_no_root;
919 }
920 }
921
922 if (opt->check == 'u') {
923 /* Only Joliet is case insensitive by default */
924 if (joliet_level)
925 opt->check = 'r';
926 else
927 opt->check = 's';
928 }
929 sbi->s_joliet_level = joliet_level;
930
931 /* Make sure the root inode is a directory */
932 if (!S_ISDIR(inode->i_mode)) {
933 printk(KERN_WARNING
934 "isofs_fill_super: root inode is not a directory. "
935 "Corrupted media?\n");
936 goto out_iput;
937 }
938
939 table = 0;
940 if (joliet_level)
941 table += 2;
942 if (opt->check == 'r')
943 table++;
944 sbi->s_check = opt->check;
945
946 if (table)
947 set_default_d_op(s, &isofs_dentry_ops[table - 1]);
948
949 /* get the root dentry */
950 s->s_root = d_make_root(inode);
951 if (!(s->s_root)) {
952 error = -ENOMEM;
953 goto out_no_inode;
954 }
955
956 return 0;
957
958 /*
959 * Display error messages and free resources.
960 */
961out_iput:
962 iput(inode);
963 goto out_no_inode;
964out_no_root:
965 error = PTR_ERR(ptr: inode);
966 if (error != -ENOMEM)
967 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
968out_no_inode:
969#ifdef CONFIG_JOLIET
970 unload_nls(sbi->s_nls_iocharset);
971#endif
972 goto out_freesbi;
973out_no_read:
974 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
975 __func__, s->s_id, iso_blknum, block);
976 goto out_freebh;
977out_bad_zone_size:
978 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
979 sbi->s_log_zone_size);
980 goto out_freebh;
981out_bad_size:
982 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
983 orig_zonesize, opt->blocksize);
984 goto out_freebh;
985out_unknown_format:
986 if (!silent)
987 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
988
989out_freebh:
990 brelse(bh);
991 brelse(bh: pri_bh);
992out_freesbi:
993 kfree(objp: sbi);
994 s->s_fs_info = NULL;
995 return error;
996}
997
998static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
999{
1000 struct super_block *sb = dentry->d_sb;
1001 u64 id = huge_encode_dev(dev: sb->s_bdev->bd_dev);
1002
1003 buf->f_type = ISOFS_SUPER_MAGIC;
1004 buf->f_bsize = sb->s_blocksize;
1005 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1006 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1007 buf->f_bfree = 0;
1008 buf->f_bavail = 0;
1009 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1010 buf->f_ffree = 0;
1011 buf->f_fsid = u64_to_fsid(v: id);
1012 buf->f_namelen = NAME_MAX;
1013 return 0;
1014}
1015
1016/*
1017 * Get a set of blocks; filling in buffer_heads if already allocated
1018 * or getblk() if they are not. Returns the number of blocks inserted
1019 * (-ve == error.)
1020 */
1021int isofs_get_blocks(struct inode *inode, sector_t iblock,
1022 struct buffer_head **bh, unsigned long nblocks)
1023{
1024 unsigned long b_off = iblock;
1025 unsigned offset, sect_size;
1026 unsigned int firstext;
1027 unsigned long nextblk, nextoff;
1028 int section, rv, error;
1029 struct iso_inode_info *ei = ISOFS_I(inode);
1030
1031 error = -EIO;
1032 rv = 0;
1033 if (iblock != b_off) {
1034 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1035 goto abort;
1036 }
1037
1038
1039 offset = 0;
1040 firstext = ei->i_first_extent;
1041 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1042 nextblk = ei->i_next_section_block;
1043 nextoff = ei->i_next_section_offset;
1044 section = 0;
1045
1046 while (nblocks) {
1047 /* If we are *way* beyond the end of the file, print a message.
1048 * Access beyond the end of the file up to the next page boundary
1049 * is normal, however because of the way the page cache works.
1050 * In this case, we just return 0 so that we can properly fill
1051 * the page with useless information without generating any
1052 * I/O errors.
1053 */
1054 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1055 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1056 __func__, b_off,
1057 (unsigned long long)inode->i_size);
1058 goto abort;
1059 }
1060
1061 /* On the last section, nextblk == 0, section size is likely to
1062 * exceed sect_size by a partial block, and access beyond the
1063 * end of the file will reach beyond the section size, too.
1064 */
1065 while (nextblk && (b_off >= (offset + sect_size))) {
1066 struct inode *ninode;
1067
1068 offset += sect_size;
1069 ninode = isofs_iget(sb: inode->i_sb, block: nextblk, offset: nextoff);
1070 if (IS_ERR(ptr: ninode)) {
1071 error = PTR_ERR(ptr: ninode);
1072 goto abort;
1073 }
1074 firstext = ISOFS_I(inode: ninode)->i_first_extent;
1075 sect_size = ISOFS_I(inode: ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1076 nextblk = ISOFS_I(inode: ninode)->i_next_section_block;
1077 nextoff = ISOFS_I(inode: ninode)->i_next_section_offset;
1078 iput(ninode);
1079
1080 if (++section > 100) {
1081 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1082 " aborting...\n", __func__);
1083 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1084 "nextblk=%lu nextoff=%lu\n", __func__,
1085 b_off, firstext, (unsigned) sect_size,
1086 nextblk, nextoff);
1087 goto abort;
1088 }
1089 }
1090
1091 if (*bh) {
1092 map_bh(bh: *bh, sb: inode->i_sb, block: firstext + b_off - offset);
1093 } else {
1094 *bh = sb_getblk(sb: inode->i_sb, block: firstext+b_off-offset);
1095 if (!*bh)
1096 goto abort;
1097 }
1098 bh++; /* Next buffer head */
1099 b_off++; /* Next buffer offset */
1100 nblocks--;
1101 rv++;
1102 }
1103
1104 error = 0;
1105abort:
1106 return rv != 0 ? rv : error;
1107}
1108
1109/*
1110 * Used by the standard interfaces.
1111 */
1112static int isofs_get_block(struct inode *inode, sector_t iblock,
1113 struct buffer_head *bh_result, int create)
1114{
1115 int ret;
1116
1117 if (create) {
1118 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1119 return -EROFS;
1120 }
1121
1122 ret = isofs_get_blocks(inode, iblock, bh: &bh_result, nblocks: 1);
1123 return ret < 0 ? ret : 0;
1124}
1125
1126static int isofs_bmap(struct inode *inode, sector_t block)
1127{
1128 struct buffer_head dummy;
1129 int error;
1130
1131 dummy.b_state = 0;
1132 dummy.b_blocknr = -1000;
1133 error = isofs_get_block(inode, iblock: block, bh_result: &dummy, create: 0);
1134 if (!error)
1135 return dummy.b_blocknr;
1136 return 0;
1137}
1138
1139struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1140{
1141 sector_t blknr = isofs_bmap(inode, block);
1142 if (!blknr)
1143 return NULL;
1144 return sb_bread(sb: inode->i_sb, block: blknr);
1145}
1146
1147static int isofs_read_folio(struct file *file, struct folio *folio)
1148{
1149 return mpage_read_folio(folio, get_block: isofs_get_block);
1150}
1151
1152static void isofs_readahead(struct readahead_control *rac)
1153{
1154 mpage_readahead(rac, get_block: isofs_get_block);
1155}
1156
1157static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1158{
1159 return generic_block_bmap(mapping,block,isofs_get_block);
1160}
1161
1162static const struct address_space_operations isofs_aops = {
1163 .read_folio = isofs_read_folio,
1164 .readahead = isofs_readahead,
1165 .bmap = _isofs_bmap
1166};
1167
1168static int isofs_read_level3_size(struct inode *inode)
1169{
1170 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1171 int high_sierra = ISOFS_SB(sb: inode->i_sb)->s_high_sierra;
1172 struct buffer_head *bh = NULL;
1173 unsigned long block, offset, block_saved, offset_saved;
1174 int i = 0;
1175 int more_entries = 0;
1176 struct iso_directory_record *tmpde = NULL;
1177 struct iso_inode_info *ei = ISOFS_I(inode);
1178
1179 inode->i_size = 0;
1180
1181 /* The first 16 blocks are reserved as the System Area. Thus,
1182 * no inodes can appear in block 0. We use this to flag that
1183 * this is the last section. */
1184 ei->i_next_section_block = 0;
1185 ei->i_next_section_offset = 0;
1186
1187 block = ei->i_iget5_block;
1188 offset = ei->i_iget5_offset;
1189
1190 do {
1191 struct iso_directory_record *de;
1192 unsigned int de_len;
1193
1194 if (!bh) {
1195 bh = sb_bread(sb: inode->i_sb, block);
1196 if (!bh)
1197 goto out_noread;
1198 }
1199 de = (struct iso_directory_record *) (bh->b_data + offset);
1200 de_len = *(unsigned char *) de;
1201
1202 if (de_len == 0) {
1203 brelse(bh);
1204 bh = NULL;
1205 ++block;
1206 offset = 0;
1207 continue;
1208 }
1209
1210 block_saved = block;
1211 offset_saved = offset;
1212 offset += de_len;
1213
1214 /* Make sure we have a full directory entry */
1215 if (offset >= bufsize) {
1216 int slop = bufsize - offset + de_len;
1217 if (!tmpde) {
1218 tmpde = kmalloc(256, GFP_KERNEL);
1219 if (!tmpde)
1220 goto out_nomem;
1221 }
1222 memcpy(tmpde, de, slop);
1223 offset &= bufsize - 1;
1224 block++;
1225 brelse(bh);
1226 bh = NULL;
1227 if (offset) {
1228 bh = sb_bread(sb: inode->i_sb, block);
1229 if (!bh)
1230 goto out_noread;
1231 memcpy((void *)tmpde+slop, bh->b_data, offset);
1232 }
1233 de = tmpde;
1234 }
1235
1236 inode->i_size += isonum_733(p: de->size);
1237 if (i == 1) {
1238 ei->i_next_section_block = block_saved;
1239 ei->i_next_section_offset = offset_saved;
1240 }
1241
1242 more_entries = de->flags[-high_sierra] & 0x80;
1243
1244 i++;
1245 if (i > 100)
1246 goto out_toomany;
1247 } while (more_entries);
1248out:
1249 kfree(objp: tmpde);
1250 brelse(bh);
1251 return 0;
1252
1253out_nomem:
1254 brelse(bh);
1255 return -ENOMEM;
1256
1257out_noread:
1258 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1259 kfree(objp: tmpde);
1260 return -EIO;
1261
1262out_toomany:
1263 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1264 "isofs_read_level3_size: inode=%lu\n",
1265 __func__, inode->i_ino);
1266 goto out;
1267}
1268
1269static int isofs_read_inode(struct inode *inode, int relocated)
1270{
1271 struct super_block *sb = inode->i_sb;
1272 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1273 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1274 unsigned long block;
1275 int high_sierra = sbi->s_high_sierra;
1276 struct buffer_head *bh;
1277 struct iso_directory_record *de;
1278 struct iso_directory_record *tmpde = NULL;
1279 unsigned int de_len;
1280 unsigned long offset;
1281 struct iso_inode_info *ei = ISOFS_I(inode);
1282 int ret = -EIO;
1283 struct timespec64 ts;
1284
1285 block = ei->i_iget5_block;
1286 bh = sb_bread(sb: inode->i_sb, block);
1287 if (!bh)
1288 goto out_badread;
1289
1290 offset = ei->i_iget5_offset;
1291
1292 de = (struct iso_directory_record *) (bh->b_data + offset);
1293 de_len = *(unsigned char *) de;
1294 if (de_len < sizeof(struct iso_directory_record))
1295 goto fail;
1296
1297 if (offset + de_len > bufsize) {
1298 int frag1 = bufsize - offset;
1299
1300 tmpde = kmalloc(de_len, GFP_KERNEL);
1301 if (!tmpde) {
1302 ret = -ENOMEM;
1303 goto fail;
1304 }
1305 memcpy(tmpde, bh->b_data + offset, frag1);
1306 brelse(bh);
1307 bh = sb_bread(sb: inode->i_sb, block: ++block);
1308 if (!bh)
1309 goto out_badread;
1310 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1311 de = tmpde;
1312 }
1313
1314 inode->i_ino = isofs_get_ino(block: ei->i_iget5_block,
1315 offset: ei->i_iget5_offset,
1316 ISOFS_BUFFER_BITS(inode));
1317
1318 /* Assume it is a normal-format file unless told otherwise */
1319 ei->i_file_format = isofs_file_normal;
1320
1321 if (de->flags[-high_sierra] & 2) {
1322 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1323 inode->i_mode = S_IFDIR | sbi->s_dmode;
1324 else
1325 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1326 set_nlink(inode, nlink: 1); /*
1327 * Set to 1. We know there are 2, but
1328 * the find utility tries to optimize
1329 * if it is 2, and it screws up. It is
1330 * easier to give 1 which tells find to
1331 * do it the hard way.
1332 */
1333 } else {
1334 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1335 inode->i_mode = S_IFREG | sbi->s_fmode;
1336 } else {
1337 /*
1338 * Set default permissions: r-x for all. The disc
1339 * could be shared with DOS machines so virtually
1340 * anything could be a valid executable.
1341 */
1342 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1343 }
1344 set_nlink(inode, nlink: 1);
1345 }
1346 inode->i_uid = sbi->s_uid;
1347 inode->i_gid = sbi->s_gid;
1348 inode->i_blocks = 0;
1349
1350 ei->i_format_parm[0] = 0;
1351 ei->i_format_parm[1] = 0;
1352 ei->i_format_parm[2] = 0;
1353
1354 ei->i_section_size = isonum_733(p: de->size);
1355 if (de->flags[-high_sierra] & 0x80) {
1356 ret = isofs_read_level3_size(inode);
1357 if (ret < 0)
1358 goto fail;
1359 ret = -EIO;
1360 } else {
1361 ei->i_next_section_block = 0;
1362 ei->i_next_section_offset = 0;
1363 inode->i_size = isonum_733(p: de->size);
1364 }
1365
1366 /*
1367 * Some dipshit decided to store some other bit of information
1368 * in the high byte of the file length. Truncate size in case
1369 * this CDROM was mounted with the cruft option.
1370 */
1371
1372 if (sbi->s_cruft)
1373 inode->i_size &= 0x00ffffff;
1374
1375 if (de->interleave[0]) {
1376 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1377 inode->i_size = 0;
1378 }
1379
1380 /* I have no idea what file_unit_size is used for, so
1381 we will flag it for now */
1382 if (de->file_unit_size[0] != 0) {
1383 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1384 inode->i_ino);
1385 }
1386
1387 /* I have no idea what other flag bits are used for, so
1388 we will flag it for now */
1389#ifdef DEBUG
1390 if((de->flags[-high_sierra] & ~2)!= 0){
1391 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1392 "(%ld %x).\n",
1393 inode->i_ino, de->flags[-high_sierra]);
1394 }
1395#endif
1396 ts = iso_date(p: de->date, flags: high_sierra ? ISO_DATE_HIGH_SIERRA : 0);
1397 inode_set_ctime_to_ts(inode, ts);
1398 inode_set_atime_to_ts(inode, ts);
1399 inode_set_mtime_to_ts(inode, ts);
1400
1401 ei->i_first_extent = (isonum_733(p: de->extent) +
1402 isonum_711(p: de->ext_attr_length));
1403
1404 /* Set the number of blocks for stat() - should be done before RR */
1405 inode->i_blocks = (inode->i_size + 511) >> 9;
1406
1407 /*
1408 * Now test for possible Rock Ridge extensions which will override
1409 * some of these numbers in the inode structure.
1410 */
1411
1412 if (!high_sierra) {
1413 parse_rock_ridge_inode(de, inode, relocated);
1414 /* if we want uid/gid set, override the rock ridge setting */
1415 if (sbi->s_uid_set)
1416 inode->i_uid = sbi->s_uid;
1417 if (sbi->s_gid_set)
1418 inode->i_gid = sbi->s_gid;
1419 }
1420 /* Now set final access rights if overriding rock ridge setting */
1421 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1422 sbi->s_dmode != ISOFS_INVALID_MODE)
1423 inode->i_mode = S_IFDIR | sbi->s_dmode;
1424 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1425 sbi->s_fmode != ISOFS_INVALID_MODE)
1426 inode->i_mode = S_IFREG | sbi->s_fmode;
1427
1428 /* Install the inode operations vector */
1429 if (S_ISREG(inode->i_mode)) {
1430 inode->i_fop = &generic_ro_fops;
1431 switch (ei->i_file_format) {
1432#ifdef CONFIG_ZISOFS
1433 case isofs_file_compressed:
1434 inode->i_data.a_ops = &zisofs_aops;
1435 break;
1436#endif
1437 default:
1438 inode->i_data.a_ops = &isofs_aops;
1439 break;
1440 }
1441 } else if (S_ISDIR(inode->i_mode)) {
1442 inode->i_op = &isofs_dir_inode_operations;
1443 inode->i_fop = &isofs_dir_operations;
1444 } else if (S_ISLNK(inode->i_mode)) {
1445 inode->i_op = &page_symlink_inode_operations;
1446 inode_nohighmem(inode);
1447 inode->i_data.a_ops = &isofs_symlink_aops;
1448 } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
1449 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
1450 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1451 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1452 } else {
1453 printk(KERN_DEBUG "ISOFS: Invalid file type 0%04o for inode %lu.\n",
1454 inode->i_mode, inode->i_ino);
1455 ret = -EIO;
1456 goto fail;
1457 }
1458
1459 ret = 0;
1460out:
1461 kfree(objp: tmpde);
1462 brelse(bh);
1463 return ret;
1464
1465out_badread:
1466 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1467fail:
1468 goto out;
1469}
1470
1471struct isofs_iget5_callback_data {
1472 unsigned long block;
1473 unsigned long offset;
1474};
1475
1476static int isofs_iget5_test(struct inode *ino, void *data)
1477{
1478 struct iso_inode_info *i = ISOFS_I(inode: ino);
1479 struct isofs_iget5_callback_data *d =
1480 (struct isofs_iget5_callback_data*)data;
1481 return (i->i_iget5_block == d->block)
1482 && (i->i_iget5_offset == d->offset);
1483}
1484
1485static int isofs_iget5_set(struct inode *ino, void *data)
1486{
1487 struct iso_inode_info *i = ISOFS_I(inode: ino);
1488 struct isofs_iget5_callback_data *d =
1489 (struct isofs_iget5_callback_data*)data;
1490 i->i_iget5_block = d->block;
1491 i->i_iget5_offset = d->offset;
1492 return 0;
1493}
1494
1495/* Store, in the inode's containing structure, the block and block
1496 * offset that point to the underlying meta-data for the inode. The
1497 * code below is otherwise similar to the iget() code in
1498 * include/linux/fs.h */
1499struct inode *__isofs_iget(struct super_block *sb,
1500 unsigned long block,
1501 unsigned long offset,
1502 int relocated)
1503{
1504 unsigned long hashval;
1505 struct inode *inode;
1506 struct isofs_iget5_callback_data data;
1507 long ret;
1508
1509 if (offset >= 1ul << sb->s_blocksize_bits)
1510 return ERR_PTR(error: -EINVAL);
1511
1512 data.block = block;
1513 data.offset = offset;
1514
1515 hashval = (block << sb->s_blocksize_bits) | offset;
1516
1517 inode = iget5_locked(sb, hashval, test: &isofs_iget5_test,
1518 set: &isofs_iget5_set, &data);
1519
1520 if (!inode)
1521 return ERR_PTR(error: -ENOMEM);
1522
1523 if (inode_state_read_once(inode) & I_NEW) {
1524 ret = isofs_read_inode(inode, relocated);
1525 if (ret < 0) {
1526 iget_failed(inode);
1527 inode = ERR_PTR(error: ret);
1528 } else {
1529 unlock_new_inode(inode);
1530 }
1531 }
1532
1533 return inode;
1534}
1535
1536static int isofs_get_tree(struct fs_context *fc)
1537{
1538 return get_tree_bdev(fc, fill_super: isofs_fill_super);
1539}
1540
1541static void isofs_free_fc(struct fs_context *fc)
1542{
1543 struct isofs_options *opt = fc->fs_private;
1544
1545 kfree(objp: opt->iocharset);
1546 kfree(objp: opt);
1547}
1548
1549static const struct fs_context_operations isofs_context_ops = {
1550 .parse_param = isofs_parse_param,
1551 .get_tree = isofs_get_tree,
1552 .reconfigure = isofs_reconfigure,
1553 .free = isofs_free_fc,
1554};
1555
1556static int isofs_init_fs_context(struct fs_context *fc)
1557{
1558 struct isofs_options *opt;
1559
1560 opt = kzalloc(sizeof(*opt), GFP_KERNEL);
1561 if (!opt)
1562 return -ENOMEM;
1563
1564 opt->map = 'n';
1565 opt->rock = 1;
1566 opt->joliet = 1;
1567 opt->cruft = 0;
1568 opt->hide = 0;
1569 opt->showassoc = 0;
1570 opt->check = 'u'; /* unset */
1571 opt->nocompress = 0;
1572 opt->blocksize = 1024;
1573 opt->fmode = opt->dmode = ISOFS_INVALID_MODE;
1574 opt->uid_set = 0;
1575 opt->gid_set = 0;
1576 opt->gid = GLOBAL_ROOT_GID;
1577 opt->uid = GLOBAL_ROOT_UID;
1578 opt->iocharset = NULL;
1579 opt->overriderockperm = 0;
1580 opt->session = -1;
1581 opt->sbsector = -1;
1582
1583 fc->fs_private = opt;
1584 fc->ops = &isofs_context_ops;
1585
1586 return 0;
1587}
1588
1589static struct file_system_type iso9660_fs_type = {
1590 .owner = THIS_MODULE,
1591 .name = "iso9660",
1592 .kill_sb = kill_block_super,
1593 .fs_flags = FS_REQUIRES_DEV,
1594 .init_fs_context = isofs_init_fs_context,
1595 .parameters = isofs_param_spec,
1596};
1597MODULE_ALIAS_FS("iso9660");
1598MODULE_ALIAS("iso9660");
1599
1600static int __init init_iso9660_fs(void)
1601{
1602 int err = init_inodecache();
1603 if (err)
1604 goto out;
1605#ifdef CONFIG_ZISOFS
1606 err = zisofs_init();
1607 if (err)
1608 goto out1;
1609#endif
1610 err = register_filesystem(&iso9660_fs_type);
1611 if (err)
1612 goto out2;
1613 return 0;
1614out2:
1615#ifdef CONFIG_ZISOFS
1616 zisofs_cleanup();
1617out1:
1618#endif
1619 destroy_inodecache();
1620out:
1621 return err;
1622}
1623
1624static void __exit exit_iso9660_fs(void)
1625{
1626 unregister_filesystem(&iso9660_fs_type);
1627#ifdef CONFIG_ZISOFS
1628 zisofs_cleanup();
1629#endif
1630 destroy_inodecache();
1631}
1632
1633module_init(init_iso9660_fs)
1634module_exit(exit_iso9660_fs)
1635MODULE_DESCRIPTION("ISO 9660 CDROM file system support");
1636MODULE_LICENSE("GPL");
1637

source code of linux/fs/isofs/inode.c