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[mirror_ubuntu-hirsute-kernel.git] / fs / isofs / inode.c
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
38 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
39 static int isofs_dentry_cmpi(const struct dentry *dentry,
40 unsigned int len, const char *str, const struct qstr *name);
41
42 #ifdef CONFIG_JOLIET
43 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
44 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
45 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
46 unsigned int len, const char *str, const struct qstr *name);
47 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
48 unsigned int len, const char *str, const struct qstr *name);
49 #endif
50
51 static 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
64 static int isofs_read_inode(struct inode *, int relocated);
65 static int isofs_statfs (struct dentry *, struct kstatfs *);
66 static int isofs_show_options(struct seq_file *, struct dentry *);
67
68 static struct kmem_cache *isofs_inode_cachep;
69
70 static struct inode *isofs_alloc_inode(struct super_block *sb)
71 {
72 struct iso_inode_info *ei;
73 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
74 if (!ei)
75 return NULL;
76 return &ei->vfs_inode;
77 }
78
79 static void isofs_free_inode(struct inode *inode)
80 {
81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
82 }
83
84 static void init_once(void *foo)
85 {
86 struct iso_inode_info *ei = foo;
87
88 inode_init_once(&ei->vfs_inode);
89 }
90
91 static 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
103 static 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
113 static 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
121 static 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
131 static 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
148 struct 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 int utf8:1;
159 unsigned char map;
160 unsigned char check;
161 unsigned int blocksize;
162 umode_t fmode;
163 umode_t dmode;
164 kgid_t gid;
165 kuid_t uid;
166 char *iocharset;
167 /* LVE */
168 s32 session;
169 s32 sbsector;
170 };
171
172 /*
173 * Compute the hash for the isofs name corresponding to the dentry.
174 */
175 static int
176 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
177 {
178 const char *name;
179 int len;
180 char c;
181 unsigned long hash;
182
183 len = qstr->len;
184 name = qstr->name;
185 if (ms) {
186 while (len && name[len-1] == '.')
187 len--;
188 }
189
190 hash = init_name_hash(dentry);
191 while (len--) {
192 c = tolower(*name++);
193 hash = partial_name_hash(c, hash);
194 }
195 qstr->hash = end_name_hash(hash);
196
197 return 0;
198 }
199
200 /*
201 * Compare of two isofs names.
202 */
203 static int isofs_dentry_cmp_common(
204 unsigned int len, const char *str,
205 const struct qstr *name, int ms, int ci)
206 {
207 int alen, blen;
208
209 /* A filename cannot end in '.' or we treat it like it has none */
210 alen = name->len;
211 blen = len;
212 if (ms) {
213 while (alen && name->name[alen-1] == '.')
214 alen--;
215 while (blen && str[blen-1] == '.')
216 blen--;
217 }
218 if (alen == blen) {
219 if (ci) {
220 if (strncasecmp(name->name, str, alen) == 0)
221 return 0;
222 } else {
223 if (strncmp(name->name, str, alen) == 0)
224 return 0;
225 }
226 }
227 return 1;
228 }
229
230 static int
231 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
232 {
233 return isofs_hashi_common(dentry, qstr, 0);
234 }
235
236 static int
237 isofs_dentry_cmpi(const struct dentry *dentry,
238 unsigned int len, const char *str, const struct qstr *name)
239 {
240 return isofs_dentry_cmp_common(len, str, name, 0, 1);
241 }
242
243 #ifdef CONFIG_JOLIET
244 /*
245 * Compute the hash for the isofs name corresponding to the dentry.
246 */
247 static int
248 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
249 {
250 const char *name;
251 int len;
252
253 len = qstr->len;
254 name = qstr->name;
255 if (ms) {
256 while (len && name[len-1] == '.')
257 len--;
258 }
259
260 qstr->hash = full_name_hash(dentry, name, len);
261
262 return 0;
263 }
264
265 static int
266 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
267 {
268 return isofs_hash_common(dentry, qstr, 1);
269 }
270
271 static int
272 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
273 {
274 return isofs_hashi_common(dentry, qstr, 1);
275 }
276
277 static int
278 isofs_dentry_cmp_ms(const struct dentry *dentry,
279 unsigned int len, const char *str, const struct qstr *name)
280 {
281 return isofs_dentry_cmp_common(len, str, name, 1, 0);
282 }
283
284 static int
285 isofs_dentry_cmpi_ms(const struct dentry *dentry,
286 unsigned int len, const char *str, const struct qstr *name)
287 {
288 return isofs_dentry_cmp_common(len, str, name, 1, 1);
289 }
290 #endif
291
292 enum {
293 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
294 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
295 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
296 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
297 };
298
299 static const match_table_t tokens = {
300 {Opt_norock, "norock"},
301 {Opt_nojoliet, "nojoliet"},
302 {Opt_unhide, "unhide"},
303 {Opt_hide, "hide"},
304 {Opt_showassoc, "showassoc"},
305 {Opt_cruft, "cruft"},
306 {Opt_utf8, "utf8"},
307 {Opt_iocharset, "iocharset=%s"},
308 {Opt_map_a, "map=acorn"},
309 {Opt_map_a, "map=a"},
310 {Opt_map_n, "map=normal"},
311 {Opt_map_n, "map=n"},
312 {Opt_map_o, "map=off"},
313 {Opt_map_o, "map=o"},
314 {Opt_session, "session=%u"},
315 {Opt_sb, "sbsector=%u"},
316 {Opt_check_r, "check=relaxed"},
317 {Opt_check_r, "check=r"},
318 {Opt_check_s, "check=strict"},
319 {Opt_check_s, "check=s"},
320 {Opt_uid, "uid=%u"},
321 {Opt_gid, "gid=%u"},
322 {Opt_mode, "mode=%u"},
323 {Opt_dmode, "dmode=%u"},
324 {Opt_overriderockperm, "overriderockperm"},
325 {Opt_block, "block=%u"},
326 {Opt_ignore, "conv=binary"},
327 {Opt_ignore, "conv=b"},
328 {Opt_ignore, "conv=text"},
329 {Opt_ignore, "conv=t"},
330 {Opt_ignore, "conv=mtext"},
331 {Opt_ignore, "conv=m"},
332 {Opt_ignore, "conv=auto"},
333 {Opt_ignore, "conv=a"},
334 {Opt_nocompress, "nocompress"},
335 {Opt_err, NULL}
336 };
337
338 static int parse_options(char *options, struct iso9660_options *popt)
339 {
340 char *p;
341 int option;
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->utf8 = 0;
359 popt->overriderockperm = 0;
360 popt->session=-1;
361 popt->sbsector=-1;
362 if (!options)
363 return 1;
364
365 while ((p = strsep(&options, ",")) != NULL) {
366 int token;
367 substring_t args[MAX_OPT_ARGS];
368 unsigned n;
369
370 if (!*p)
371 continue;
372
373 token = match_token(p, tokens, args);
374 switch (token) {
375 case Opt_norock:
376 popt->rock = 0;
377 break;
378 case Opt_nojoliet:
379 popt->joliet = 0;
380 break;
381 case Opt_hide:
382 popt->hide = 1;
383 break;
384 case Opt_unhide:
385 case Opt_showassoc:
386 popt->showassoc = 1;
387 break;
388 case Opt_cruft:
389 popt->cruft = 1;
390 break;
391 case Opt_utf8:
392 popt->utf8 = 1;
393 break;
394 #ifdef CONFIG_JOLIET
395 case Opt_iocharset:
396 kfree(popt->iocharset);
397 popt->iocharset = match_strdup(&args[0]);
398 if (!popt->iocharset)
399 return 0;
400 break;
401 #endif
402 case Opt_map_a:
403 popt->map = 'a';
404 break;
405 case Opt_map_o:
406 popt->map = 'o';
407 break;
408 case Opt_map_n:
409 popt->map = 'n';
410 break;
411 case Opt_session:
412 if (match_int(&args[0], &option))
413 return 0;
414 n = option;
415 /*
416 * Track numbers are supposed to be in range 1-99, the
417 * mount option starts indexing at 0.
418 */
419 if (n >= 99)
420 return 0;
421 popt->session = n + 1;
422 break;
423 case Opt_sb:
424 if (match_int(&args[0], &option))
425 return 0;
426 popt->sbsector = option;
427 break;
428 case Opt_check_r:
429 popt->check = 'r';
430 break;
431 case Opt_check_s:
432 popt->check = 's';
433 break;
434 case Opt_ignore:
435 break;
436 case Opt_uid:
437 if (match_int(&args[0], &option))
438 return 0;
439 popt->uid = make_kuid(current_user_ns(), option);
440 if (!uid_valid(popt->uid))
441 return 0;
442 popt->uid_set = 1;
443 break;
444 case Opt_gid:
445 if (match_int(&args[0], &option))
446 return 0;
447 popt->gid = make_kgid(current_user_ns(), option);
448 if (!gid_valid(popt->gid))
449 return 0;
450 popt->gid_set = 1;
451 break;
452 case Opt_mode:
453 if (match_int(&args[0], &option))
454 return 0;
455 popt->fmode = option;
456 break;
457 case Opt_dmode:
458 if (match_int(&args[0], &option))
459 return 0;
460 popt->dmode = option;
461 break;
462 case Opt_overriderockperm:
463 popt->overriderockperm = 1;
464 break;
465 case Opt_block:
466 if (match_int(&args[0], &option))
467 return 0;
468 n = option;
469 if (n != 512 && n != 1024 && n != 2048)
470 return 0;
471 popt->blocksize = n;
472 break;
473 case Opt_nocompress:
474 popt->nocompress = 1;
475 break;
476 default:
477 return 0;
478 }
479 }
480 return 1;
481 }
482
483 /*
484 * Display the mount options in /proc/mounts.
485 */
486 static int isofs_show_options(struct seq_file *m, struct dentry *root)
487 {
488 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
489
490 if (!sbi->s_rock) seq_puts(m, ",norock");
491 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
492 if (sbi->s_cruft) seq_puts(m, ",cruft");
493 if (sbi->s_hide) seq_puts(m, ",hide");
494 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
495 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
496 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
497 if (sbi->s_utf8) seq_puts(m, ",utf8");
498
499 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
500 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
501 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
502 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
503
504 if (root->d_sb->s_blocksize != 1024)
505 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
506
507 if (sbi->s_uid_set)
508 seq_printf(m, ",uid=%u",
509 from_kuid_munged(&init_user_ns, sbi->s_uid));
510 if (sbi->s_gid_set)
511 seq_printf(m, ",gid=%u",
512 from_kgid_munged(&init_user_ns, sbi->s_gid));
513
514 if (sbi->s_dmode != ISOFS_INVALID_MODE)
515 seq_printf(m, ",dmode=%o", sbi->s_dmode);
516 if (sbi->s_fmode != ISOFS_INVALID_MODE)
517 seq_printf(m, ",fmode=%o", sbi->s_fmode);
518
519 #ifdef CONFIG_JOLIET
520 if (sbi->s_nls_iocharset &&
521 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
522 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
523 #endif
524 return 0;
525 }
526
527 /*
528 * look if the driver can tell the multi session redirection value
529 *
530 * don't change this if you don't know what you do, please!
531 * Multisession is legal only with XA disks.
532 * A non-XA disk with more than one volume descriptor may do it right, but
533 * usually is written in a nowhere standardized "multi-partition" manner.
534 * Multisession uses absolute addressing (solely the first frame of the whole
535 * track is #0), multi-partition uses relative addressing (each first frame of
536 * each track is #0), and a track is not a session.
537 *
538 * A broken CDwriter software or drive firmware does not set new standards,
539 * at least not if conflicting with the existing ones.
540 *
541 * emoenke@gwdg.de
542 */
543 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
544
545 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
546 {
547 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
548 unsigned int vol_desc_start = 0;
549
550 if (session > 0) {
551 struct cdrom_tocentry te;
552
553 if (!cdi)
554 return 0;
555
556 te.cdte_track = session;
557 te.cdte_format = CDROM_LBA;
558 if (cdrom_read_tocentry(cdi, &te) == 0) {
559 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
560 session, te.cdte_addr.lba,
561 te.cdte_ctrl & CDROM_DATA_TRACK);
562 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
563 return te.cdte_addr.lba;
564 }
565
566 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
567 }
568
569 if (cdi) {
570 struct cdrom_multisession ms_info;
571
572 ms_info.addr_format = CDROM_LBA;
573 if (cdrom_multisession(cdi, &ms_info) == 0) {
574 #if WE_OBEY_THE_WRITTEN_STANDARDS
575 /* necessary for a valid ms_info.addr */
576 if (ms_info.xa_flag)
577 #endif
578 vol_desc_start = ms_info.addr.lba;
579 }
580 }
581
582 return vol_desc_start;
583 }
584
585 /*
586 * Check if root directory is empty (has less than 3 files).
587 *
588 * Used to detect broken CDs where ISO root directory is empty but Joliet root
589 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
590 * (and Joliet used instead) or else no files would be visible.
591 */
592 static bool rootdir_empty(struct super_block *sb, unsigned long block)
593 {
594 int offset = 0, files = 0, de_len;
595 struct iso_directory_record *de;
596 struct buffer_head *bh;
597
598 bh = sb_bread(sb, block);
599 if (!bh)
600 return true;
601 while (files < 3) {
602 de = (struct iso_directory_record *) (bh->b_data + offset);
603 de_len = *(unsigned char *) de;
604 if (de_len == 0)
605 break;
606 files++;
607 offset += de_len;
608 }
609 brelse(bh);
610 return files < 3;
611 }
612
613 /*
614 * Initialize the superblock and read the root inode.
615 */
616 static int isofs_fill_super(struct super_block *s, void *data, int silent)
617 {
618 struct buffer_head *bh = NULL, *pri_bh = NULL;
619 struct hs_primary_descriptor *h_pri = NULL;
620 struct iso_primary_descriptor *pri = NULL;
621 struct iso_supplementary_descriptor *sec = NULL;
622 struct iso_directory_record *rootp;
623 struct inode *inode;
624 struct iso9660_options opt;
625 struct isofs_sb_info *sbi;
626 unsigned long first_data_zone;
627 int joliet_level = 0;
628 int iso_blknum, block;
629 int orig_zonesize;
630 int table, error = -EINVAL;
631 unsigned int vol_desc_start;
632
633 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
634 if (!sbi)
635 return -ENOMEM;
636 s->s_fs_info = sbi;
637
638 if (!parse_options((char *)data, &opt))
639 goto out_freesbi;
640
641 /*
642 * First of all, get the hardware blocksize for this device.
643 * If we don't know what it is, or the hardware blocksize is
644 * larger than the blocksize the user specified, then use
645 * that value.
646 */
647 /*
648 * What if bugger tells us to go beyond page size?
649 */
650 if (bdev_logical_block_size(s->s_bdev) > 2048) {
651 printk(KERN_WARNING
652 "ISOFS: unsupported/invalid hardware sector size %d\n",
653 bdev_logical_block_size(s->s_bdev));
654 goto out_freesbi;
655 }
656 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
657
658 sbi->s_high_sierra = 0; /* default is iso9660 */
659 sbi->s_session = opt.session;
660 sbi->s_sbsector = opt.sbsector;
661
662 vol_desc_start = (opt.sbsector != -1) ?
663 opt.sbsector : isofs_get_last_session(s,opt.session);
664
665 for (iso_blknum = vol_desc_start+16;
666 iso_blknum < vol_desc_start+100; iso_blknum++) {
667 struct hs_volume_descriptor *hdp;
668 struct iso_volume_descriptor *vdp;
669
670 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
671 if (!(bh = sb_bread(s, block)))
672 goto out_no_read;
673
674 vdp = (struct iso_volume_descriptor *)bh->b_data;
675 hdp = (struct hs_volume_descriptor *)bh->b_data;
676
677 /*
678 * Due to the overlapping physical location of the descriptors,
679 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
680 * proper identification in this case, we first check for ISO.
681 */
682 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
683 if (isonum_711(vdp->type) == ISO_VD_END)
684 break;
685 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
686 if (!pri) {
687 pri = (struct iso_primary_descriptor *)vdp;
688 /* Save the buffer in case we need it ... */
689 pri_bh = bh;
690 bh = NULL;
691 }
692 }
693 #ifdef CONFIG_JOLIET
694 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
695 sec = (struct iso_supplementary_descriptor *)vdp;
696 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
697 if (opt.joliet) {
698 if (sec->escape[2] == 0x40)
699 joliet_level = 1;
700 else if (sec->escape[2] == 0x43)
701 joliet_level = 2;
702 else if (sec->escape[2] == 0x45)
703 joliet_level = 3;
704
705 printk(KERN_DEBUG "ISO 9660 Extensions: "
706 "Microsoft Joliet Level %d\n",
707 joliet_level);
708 }
709 goto root_found;
710 } else {
711 /* Unknown supplementary volume descriptor */
712 sec = NULL;
713 }
714 }
715 #endif
716 } else {
717 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
718 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
719 goto out_freebh;
720
721 sbi->s_high_sierra = 1;
722 opt.rock = 0;
723 h_pri = (struct hs_primary_descriptor *)vdp;
724 goto root_found;
725 }
726 }
727
728 /* Just skip any volume descriptors we don't recognize */
729
730 brelse(bh);
731 bh = NULL;
732 }
733 /*
734 * If we fall through, either no volume descriptor was found,
735 * or else we passed a primary descriptor looking for others.
736 */
737 if (!pri)
738 goto out_unknown_format;
739 brelse(bh);
740 bh = pri_bh;
741 pri_bh = NULL;
742
743 root_found:
744 /* We don't support read-write mounts */
745 if (!sb_rdonly(s)) {
746 error = -EACCES;
747 goto out_freebh;
748 }
749
750 if (joliet_level && (!pri || !opt.rock)) {
751 /* This is the case of Joliet with the norock mount flag.
752 * A disc with both Joliet and Rock Ridge is handled later
753 */
754 pri = (struct iso_primary_descriptor *) sec;
755 }
756
757 if(sbi->s_high_sierra){
758 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
759 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
760 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
761 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
762 } else {
763 if (!pri)
764 goto out_freebh;
765 rootp = (struct iso_directory_record *) pri->root_directory_record;
766 sbi->s_nzones = isonum_733(pri->volume_space_size);
767 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
768 sbi->s_max_size = isonum_733(pri->volume_space_size);
769 }
770
771 sbi->s_ninodes = 0; /* No way to figure this out easily */
772
773 orig_zonesize = sbi->s_log_zone_size;
774 /*
775 * If the zone size is smaller than the hardware sector size,
776 * this is a fatal error. This would occur if the disc drive
777 * had sectors that were 2048 bytes, but the filesystem had
778 * blocks that were 512 bytes (which should only very rarely
779 * happen.)
780 */
781 if (orig_zonesize < opt.blocksize)
782 goto out_bad_size;
783
784 /* RDE: convert log zone size to bit shift */
785 switch (sbi->s_log_zone_size) {
786 case 512: sbi->s_log_zone_size = 9; break;
787 case 1024: sbi->s_log_zone_size = 10; break;
788 case 2048: sbi->s_log_zone_size = 11; break;
789
790 default:
791 goto out_bad_zone_size;
792 }
793
794 s->s_magic = ISOFS_SUPER_MAGIC;
795
796 /*
797 * With multi-extent files, file size is only limited by the maximum
798 * size of a file system, which is 8 TB.
799 */
800 s->s_maxbytes = 0x80000000000LL;
801
802 /* ECMA-119 timestamp from 1900/1/1 with tz offset */
803 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
804 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
805
806 /* Set this for reference. Its not currently used except on write
807 which we don't have .. */
808
809 first_data_zone = isonum_733(rootp->extent) +
810 isonum_711(rootp->ext_attr_length);
811 sbi->s_firstdatazone = first_data_zone;
812 #ifndef BEQUIET
813 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
814 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
815 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
816 if(sbi->s_high_sierra)
817 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
818 #endif
819
820 /*
821 * If the Joliet level is set, we _may_ decide to use the
822 * secondary descriptor, but can't be sure until after we
823 * read the root inode. But before reading the root inode
824 * we may need to change the device blocksize, and would
825 * rather release the old buffer first. So, we cache the
826 * first_data_zone value from the secondary descriptor.
827 */
828 if (joliet_level) {
829 pri = (struct iso_primary_descriptor *) sec;
830 rootp = (struct iso_directory_record *)
831 pri->root_directory_record;
832 first_data_zone = isonum_733(rootp->extent) +
833 isonum_711(rootp->ext_attr_length);
834 }
835
836 /*
837 * We're all done using the volume descriptor, and may need
838 * to change the device blocksize, so release the buffer now.
839 */
840 brelse(pri_bh);
841 brelse(bh);
842
843 /*
844 * Force the blocksize to 512 for 512 byte sectors. The file
845 * read primitives really get it wrong in a bad way if we don't
846 * do this.
847 *
848 * Note - we should never be setting the blocksize to something
849 * less than the hardware sector size for the device. If we
850 * do, we would end up having to read larger buffers and split
851 * out portions to satisfy requests.
852 *
853 * Note2- the idea here is that we want to deal with the optimal
854 * zonesize in the filesystem. If we have it set to something less,
855 * then we have horrible problems with trying to piece together
856 * bits of adjacent blocks in order to properly read directory
857 * entries. By forcing the blocksize in this way, we ensure
858 * that we will never be required to do this.
859 */
860 sb_set_blocksize(s, orig_zonesize);
861
862 sbi->s_nls_iocharset = NULL;
863
864 #ifdef CONFIG_JOLIET
865 if (joliet_level && opt.utf8 == 0) {
866 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
867 sbi->s_nls_iocharset = load_nls(p);
868 if (! sbi->s_nls_iocharset) {
869 /* Fail only if explicit charset specified */
870 if (opt.iocharset)
871 goto out_freesbi;
872 sbi->s_nls_iocharset = load_nls_default();
873 }
874 }
875 #endif
876 s->s_op = &isofs_sops;
877 s->s_export_op = &isofs_export_ops;
878 sbi->s_mapping = opt.map;
879 sbi->s_rock = (opt.rock ? 2 : 0);
880 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
881 sbi->s_cruft = opt.cruft;
882 sbi->s_hide = opt.hide;
883 sbi->s_showassoc = opt.showassoc;
884 sbi->s_uid = opt.uid;
885 sbi->s_gid = opt.gid;
886 sbi->s_uid_set = opt.uid_set;
887 sbi->s_gid_set = opt.gid_set;
888 sbi->s_utf8 = opt.utf8;
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 */
990 out_iput:
991 iput(inode);
992 goto out_no_inode;
993 out_no_root:
994 error = PTR_ERR(inode);
995 if (error != -ENOMEM)
996 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
997 out_no_inode:
998 #ifdef CONFIG_JOLIET
999 unload_nls(sbi->s_nls_iocharset);
1000 #endif
1001 goto out_freesbi;
1002 out_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;
1006 out_bad_zone_size:
1007 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1008 sbi->s_log_zone_size);
1009 goto out_freebh;
1010 out_bad_size:
1011 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1012 orig_zonesize, opt.blocksize);
1013 goto out_freebh;
1014 out_unknown_format:
1015 if (!silent)
1016 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1017
1018 out_freebh:
1019 brelse(bh);
1020 brelse(pri_bh);
1021 out_freesbi:
1022 kfree(opt.iocharset);
1023 kfree(sbi);
1024 s->s_fs_info = NULL;
1025 return error;
1026 }
1027
1028 static 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.val[0] = (u32)id;
1042 buf->f_fsid.val[1] = (u32)(id >> 32);
1043 buf->f_namelen = NAME_MAX;
1044 return 0;
1045 }
1046
1047 /*
1048 * Get a set of blocks; filling in buffer_heads if already allocated
1049 * or getblk() if they are not. Returns the number of blocks inserted
1050 * (-ve == error.)
1051 */
1052 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1053 struct buffer_head **bh, unsigned long nblocks)
1054 {
1055 unsigned long b_off = iblock;
1056 unsigned offset, sect_size;
1057 unsigned int firstext;
1058 unsigned long nextblk, nextoff;
1059 int section, rv, error;
1060 struct iso_inode_info *ei = ISOFS_I(inode);
1061
1062 error = -EIO;
1063 rv = 0;
1064 if (iblock != b_off) {
1065 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1066 goto abort;
1067 }
1068
1069
1070 offset = 0;
1071 firstext = ei->i_first_extent;
1072 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1073 nextblk = ei->i_next_section_block;
1074 nextoff = ei->i_next_section_offset;
1075 section = 0;
1076
1077 while (nblocks) {
1078 /* If we are *way* beyond the end of the file, print a message.
1079 * Access beyond the end of the file up to the next page boundary
1080 * is normal, however because of the way the page cache works.
1081 * In this case, we just return 0 so that we can properly fill
1082 * the page with useless information without generating any
1083 * I/O errors.
1084 */
1085 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1086 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1087 __func__, b_off,
1088 (unsigned long long)inode->i_size);
1089 goto abort;
1090 }
1091
1092 /* On the last section, nextblk == 0, section size is likely to
1093 * exceed sect_size by a partial block, and access beyond the
1094 * end of the file will reach beyond the section size, too.
1095 */
1096 while (nextblk && (b_off >= (offset + sect_size))) {
1097 struct inode *ninode;
1098
1099 offset += sect_size;
1100 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1101 if (IS_ERR(ninode)) {
1102 error = PTR_ERR(ninode);
1103 goto abort;
1104 }
1105 firstext = ISOFS_I(ninode)->i_first_extent;
1106 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1107 nextblk = ISOFS_I(ninode)->i_next_section_block;
1108 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1109 iput(ninode);
1110
1111 if (++section > 100) {
1112 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1113 " aborting...\n", __func__);
1114 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1115 "nextblk=%lu nextoff=%lu\n", __func__,
1116 b_off, firstext, (unsigned) sect_size,
1117 nextblk, nextoff);
1118 goto abort;
1119 }
1120 }
1121
1122 if (*bh) {
1123 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1124 } else {
1125 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1126 if (!*bh)
1127 goto abort;
1128 }
1129 bh++; /* Next buffer head */
1130 b_off++; /* Next buffer offset */
1131 nblocks--;
1132 rv++;
1133 }
1134
1135 error = 0;
1136 abort:
1137 return rv != 0 ? rv : error;
1138 }
1139
1140 /*
1141 * Used by the standard interfaces.
1142 */
1143 static int isofs_get_block(struct inode *inode, sector_t iblock,
1144 struct buffer_head *bh_result, int create)
1145 {
1146 int ret;
1147
1148 if (create) {
1149 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1150 return -EROFS;
1151 }
1152
1153 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1154 return ret < 0 ? ret : 0;
1155 }
1156
1157 static int isofs_bmap(struct inode *inode, sector_t block)
1158 {
1159 struct buffer_head dummy;
1160 int error;
1161
1162 dummy.b_state = 0;
1163 dummy.b_blocknr = -1000;
1164 error = isofs_get_block(inode, block, &dummy, 0);
1165 if (!error)
1166 return dummy.b_blocknr;
1167 return 0;
1168 }
1169
1170 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1171 {
1172 sector_t blknr = isofs_bmap(inode, block);
1173 if (!blknr)
1174 return NULL;
1175 return sb_bread(inode->i_sb, blknr);
1176 }
1177
1178 static int isofs_readpage(struct file *file, struct page *page)
1179 {
1180 return mpage_readpage(page, isofs_get_block);
1181 }
1182
1183 static void isofs_readahead(struct readahead_control *rac)
1184 {
1185 mpage_readahead(rac, isofs_get_block);
1186 }
1187
1188 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1189 {
1190 return generic_block_bmap(mapping,block,isofs_get_block);
1191 }
1192
1193 static const struct address_space_operations isofs_aops = {
1194 .readpage = isofs_readpage,
1195 .readahead = isofs_readahead,
1196 .bmap = _isofs_bmap
1197 };
1198
1199 static int isofs_read_level3_size(struct inode *inode)
1200 {
1201 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1202 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1203 struct buffer_head *bh = NULL;
1204 unsigned long block, offset, block_saved, offset_saved;
1205 int i = 0;
1206 int more_entries = 0;
1207 struct iso_directory_record *tmpde = NULL;
1208 struct iso_inode_info *ei = ISOFS_I(inode);
1209
1210 inode->i_size = 0;
1211
1212 /* The first 16 blocks are reserved as the System Area. Thus,
1213 * no inodes can appear in block 0. We use this to flag that
1214 * this is the last section. */
1215 ei->i_next_section_block = 0;
1216 ei->i_next_section_offset = 0;
1217
1218 block = ei->i_iget5_block;
1219 offset = ei->i_iget5_offset;
1220
1221 do {
1222 struct iso_directory_record *de;
1223 unsigned int de_len;
1224
1225 if (!bh) {
1226 bh = sb_bread(inode->i_sb, block);
1227 if (!bh)
1228 goto out_noread;
1229 }
1230 de = (struct iso_directory_record *) (bh->b_data + offset);
1231 de_len = *(unsigned char *) de;
1232
1233 if (de_len == 0) {
1234 brelse(bh);
1235 bh = NULL;
1236 ++block;
1237 offset = 0;
1238 continue;
1239 }
1240
1241 block_saved = block;
1242 offset_saved = offset;
1243 offset += de_len;
1244
1245 /* Make sure we have a full directory entry */
1246 if (offset >= bufsize) {
1247 int slop = bufsize - offset + de_len;
1248 if (!tmpde) {
1249 tmpde = kmalloc(256, GFP_KERNEL);
1250 if (!tmpde)
1251 goto out_nomem;
1252 }
1253 memcpy(tmpde, de, slop);
1254 offset &= bufsize - 1;
1255 block++;
1256 brelse(bh);
1257 bh = NULL;
1258 if (offset) {
1259 bh = sb_bread(inode->i_sb, block);
1260 if (!bh)
1261 goto out_noread;
1262 memcpy((void *)tmpde+slop, bh->b_data, offset);
1263 }
1264 de = tmpde;
1265 }
1266
1267 inode->i_size += isonum_733(de->size);
1268 if (i == 1) {
1269 ei->i_next_section_block = block_saved;
1270 ei->i_next_section_offset = offset_saved;
1271 }
1272
1273 more_entries = de->flags[-high_sierra] & 0x80;
1274
1275 i++;
1276 if (i > 100)
1277 goto out_toomany;
1278 } while (more_entries);
1279 out:
1280 kfree(tmpde);
1281 if (bh)
1282 brelse(bh);
1283 return 0;
1284
1285 out_nomem:
1286 if (bh)
1287 brelse(bh);
1288 return -ENOMEM;
1289
1290 out_noread:
1291 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1292 kfree(tmpde);
1293 return -EIO;
1294
1295 out_toomany:
1296 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1297 "isofs_read_level3_size: inode=%lu\n",
1298 __func__, inode->i_ino);
1299 goto out;
1300 }
1301
1302 static int isofs_read_inode(struct inode *inode, int relocated)
1303 {
1304 struct super_block *sb = inode->i_sb;
1305 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1306 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1307 unsigned long block;
1308 int high_sierra = sbi->s_high_sierra;
1309 struct buffer_head *bh;
1310 struct iso_directory_record *de;
1311 struct iso_directory_record *tmpde = NULL;
1312 unsigned int de_len;
1313 unsigned long offset;
1314 struct iso_inode_info *ei = ISOFS_I(inode);
1315 int ret = -EIO;
1316
1317 block = ei->i_iget5_block;
1318 bh = sb_bread(inode->i_sb, block);
1319 if (!bh)
1320 goto out_badread;
1321
1322 offset = ei->i_iget5_offset;
1323
1324 de = (struct iso_directory_record *) (bh->b_data + offset);
1325 de_len = *(unsigned char *) de;
1326
1327 if (offset + de_len > bufsize) {
1328 int frag1 = bufsize - offset;
1329
1330 tmpde = kmalloc(de_len, GFP_KERNEL);
1331 if (!tmpde) {
1332 ret = -ENOMEM;
1333 goto fail;
1334 }
1335 memcpy(tmpde, bh->b_data + offset, frag1);
1336 brelse(bh);
1337 bh = sb_bread(inode->i_sb, ++block);
1338 if (!bh)
1339 goto out_badread;
1340 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1341 de = tmpde;
1342 }
1343
1344 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1345 ei->i_iget5_offset,
1346 ISOFS_BUFFER_BITS(inode));
1347
1348 /* Assume it is a normal-format file unless told otherwise */
1349 ei->i_file_format = isofs_file_normal;
1350
1351 if (de->flags[-high_sierra] & 2) {
1352 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1353 inode->i_mode = S_IFDIR | sbi->s_dmode;
1354 else
1355 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1356 set_nlink(inode, 1); /*
1357 * Set to 1. We know there are 2, but
1358 * the find utility tries to optimize
1359 * if it is 2, and it screws up. It is
1360 * easier to give 1 which tells find to
1361 * do it the hard way.
1362 */
1363 } else {
1364 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1365 inode->i_mode = S_IFREG | sbi->s_fmode;
1366 } else {
1367 /*
1368 * Set default permissions: r-x for all. The disc
1369 * could be shared with DOS machines so virtually
1370 * anything could be a valid executable.
1371 */
1372 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1373 }
1374 set_nlink(inode, 1);
1375 }
1376 inode->i_uid = sbi->s_uid;
1377 inode->i_gid = sbi->s_gid;
1378 inode->i_blocks = 0;
1379
1380 ei->i_format_parm[0] = 0;
1381 ei->i_format_parm[1] = 0;
1382 ei->i_format_parm[2] = 0;
1383
1384 ei->i_section_size = isonum_733(de->size);
1385 if (de->flags[-high_sierra] & 0x80) {
1386 ret = isofs_read_level3_size(inode);
1387 if (ret < 0)
1388 goto fail;
1389 ret = -EIO;
1390 } else {
1391 ei->i_next_section_block = 0;
1392 ei->i_next_section_offset = 0;
1393 inode->i_size = isonum_733(de->size);
1394 }
1395
1396 /*
1397 * Some dipshit decided to store some other bit of information
1398 * in the high byte of the file length. Truncate size in case
1399 * this CDROM was mounted with the cruft option.
1400 */
1401
1402 if (sbi->s_cruft)
1403 inode->i_size &= 0x00ffffff;
1404
1405 if (de->interleave[0]) {
1406 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1407 inode->i_size = 0;
1408 }
1409
1410 /* I have no idea what file_unit_size is used for, so
1411 we will flag it for now */
1412 if (de->file_unit_size[0] != 0) {
1413 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1414 inode->i_ino);
1415 }
1416
1417 /* I have no idea what other flag bits are used for, so
1418 we will flag it for now */
1419 #ifdef DEBUG
1420 if((de->flags[-high_sierra] & ~2)!= 0){
1421 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1422 "(%ld %x).\n",
1423 inode->i_ino, de->flags[-high_sierra]);
1424 }
1425 #endif
1426
1427 inode->i_mtime.tv_sec =
1428 inode->i_atime.tv_sec =
1429 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1430 inode->i_mtime.tv_nsec =
1431 inode->i_atime.tv_nsec =
1432 inode->i_ctime.tv_nsec = 0;
1433
1434 ei->i_first_extent = (isonum_733(de->extent) +
1435 isonum_711(de->ext_attr_length));
1436
1437 /* Set the number of blocks for stat() - should be done before RR */
1438 inode->i_blocks = (inode->i_size + 511) >> 9;
1439
1440 /*
1441 * Now test for possible Rock Ridge extensions which will override
1442 * some of these numbers in the inode structure.
1443 */
1444
1445 if (!high_sierra) {
1446 parse_rock_ridge_inode(de, inode, relocated);
1447 /* if we want uid/gid set, override the rock ridge setting */
1448 if (sbi->s_uid_set)
1449 inode->i_uid = sbi->s_uid;
1450 if (sbi->s_gid_set)
1451 inode->i_gid = sbi->s_gid;
1452 }
1453 /* Now set final access rights if overriding rock ridge setting */
1454 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1455 sbi->s_dmode != ISOFS_INVALID_MODE)
1456 inode->i_mode = S_IFDIR | sbi->s_dmode;
1457 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1458 sbi->s_fmode != ISOFS_INVALID_MODE)
1459 inode->i_mode = S_IFREG | sbi->s_fmode;
1460
1461 /* Install the inode operations vector */
1462 if (S_ISREG(inode->i_mode)) {
1463 inode->i_fop = &generic_ro_fops;
1464 switch (ei->i_file_format) {
1465 #ifdef CONFIG_ZISOFS
1466 case isofs_file_compressed:
1467 inode->i_data.a_ops = &zisofs_aops;
1468 break;
1469 #endif
1470 default:
1471 inode->i_data.a_ops = &isofs_aops;
1472 break;
1473 }
1474 } else if (S_ISDIR(inode->i_mode)) {
1475 inode->i_op = &isofs_dir_inode_operations;
1476 inode->i_fop = &isofs_dir_operations;
1477 } else if (S_ISLNK(inode->i_mode)) {
1478 inode->i_op = &page_symlink_inode_operations;
1479 inode_nohighmem(inode);
1480 inode->i_data.a_ops = &isofs_symlink_aops;
1481 } else
1482 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1483 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1484
1485 ret = 0;
1486 out:
1487 kfree(tmpde);
1488 if (bh)
1489 brelse(bh);
1490 return ret;
1491
1492 out_badread:
1493 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1494 fail:
1495 goto out;
1496 }
1497
1498 struct isofs_iget5_callback_data {
1499 unsigned long block;
1500 unsigned long offset;
1501 };
1502
1503 static int isofs_iget5_test(struct inode *ino, void *data)
1504 {
1505 struct iso_inode_info *i = ISOFS_I(ino);
1506 struct isofs_iget5_callback_data *d =
1507 (struct isofs_iget5_callback_data*)data;
1508 return (i->i_iget5_block == d->block)
1509 && (i->i_iget5_offset == d->offset);
1510 }
1511
1512 static int isofs_iget5_set(struct inode *ino, void *data)
1513 {
1514 struct iso_inode_info *i = ISOFS_I(ino);
1515 struct isofs_iget5_callback_data *d =
1516 (struct isofs_iget5_callback_data*)data;
1517 i->i_iget5_block = d->block;
1518 i->i_iget5_offset = d->offset;
1519 return 0;
1520 }
1521
1522 /* Store, in the inode's containing structure, the block and block
1523 * offset that point to the underlying meta-data for the inode. The
1524 * code below is otherwise similar to the iget() code in
1525 * include/linux/fs.h */
1526 struct inode *__isofs_iget(struct super_block *sb,
1527 unsigned long block,
1528 unsigned long offset,
1529 int relocated)
1530 {
1531 unsigned long hashval;
1532 struct inode *inode;
1533 struct isofs_iget5_callback_data data;
1534 long ret;
1535
1536 if (offset >= 1ul << sb->s_blocksize_bits)
1537 return ERR_PTR(-EINVAL);
1538
1539 data.block = block;
1540 data.offset = offset;
1541
1542 hashval = (block << sb->s_blocksize_bits) | offset;
1543
1544 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1545 &isofs_iget5_set, &data);
1546
1547 if (!inode)
1548 return ERR_PTR(-ENOMEM);
1549
1550 if (inode->i_state & I_NEW) {
1551 ret = isofs_read_inode(inode, relocated);
1552 if (ret < 0) {
1553 iget_failed(inode);
1554 inode = ERR_PTR(ret);
1555 } else {
1556 unlock_new_inode(inode);
1557 }
1558 }
1559
1560 return inode;
1561 }
1562
1563 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1564 int flags, const char *dev_name, void *data)
1565 {
1566 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1567 }
1568
1569 static struct file_system_type iso9660_fs_type = {
1570 .owner = THIS_MODULE,
1571 .name = "iso9660",
1572 .mount = isofs_mount,
1573 .kill_sb = kill_block_super,
1574 .fs_flags = FS_REQUIRES_DEV,
1575 };
1576 MODULE_ALIAS_FS("iso9660");
1577 MODULE_ALIAS("iso9660");
1578
1579 static int __init init_iso9660_fs(void)
1580 {
1581 int err = init_inodecache();
1582 if (err)
1583 goto out;
1584 #ifdef CONFIG_ZISOFS
1585 err = zisofs_init();
1586 if (err)
1587 goto out1;
1588 #endif
1589 err = register_filesystem(&iso9660_fs_type);
1590 if (err)
1591 goto out2;
1592 return 0;
1593 out2:
1594 #ifdef CONFIG_ZISOFS
1595 zisofs_cleanup();
1596 out1:
1597 #endif
1598 destroy_inodecache();
1599 out:
1600 return err;
1601 }
1602
1603 static void __exit exit_iso9660_fs(void)
1604 {
1605 unregister_filesystem(&iso9660_fs_type);
1606 #ifdef CONFIG_ZISOFS
1607 zisofs_cleanup();
1608 #endif
1609 destroy_inodecache();
1610 }
1611
1612 module_init(init_iso9660_fs)
1613 module_exit(exit_iso9660_fs)
1614 MODULE_LICENSE("GPL");
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