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defconfig: exynos9610: Re-add dropped Wi-Fi AP options lost
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / isofs / inode.c
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CommitLineData
1/*
2 * linux/fs/isofs/inode.c
3 *
4 * (C) 1991 Linus Torvalds - minix filesystem
5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
6 * 1994 Eberhard Mönkeberg - multi session handling.
7 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
8 * 1997 Gordon Chaffee - Joliet CDs
9 * 1998 Eric Lammerts - ISO 9660 Level 3
10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
11 * 2004 Paul Serice - NFS Export Operations
12 */
13
14#include <linux/init.h>
15#include <linux/module.h>
16
17#include <linux/slab.h>
18#include <linux/cred.h>
19#include <linux/nls.h>
20#include <linux/ctype.h>
21#include <linux/statfs.h>
22#include <linux/cdrom.h>
23#include <linux/parser.h>
24#include <linux/mpage.h>
25#include <linux/user_namespace.h>
26#include <linux/seq_file.h>
27#include <linux/blkdev.h>
28
29#include "isofs.h"
30#include "zisofs.h"
31
32#define BEQUIET
33
34static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
35static int isofs_dentry_cmpi(const struct dentry *dentry,
36 unsigned int len, const char *str, const struct qstr *name);
37
38#ifdef CONFIG_JOLIET
39static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
40static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
41static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
42 unsigned int len, const char *str, const struct qstr *name);
43static int isofs_dentry_cmp_ms(const struct dentry *dentry,
44 unsigned int len, const char *str, const struct qstr *name);
45#endif
46
47static void isofs_put_super(struct super_block *sb)
48{
49 struct isofs_sb_info *sbi = ISOFS_SB(sb);
50
51#ifdef CONFIG_JOLIET
52 unload_nls(sbi->s_nls_iocharset);
53#endif
54
55 kfree(sbi);
56 sb->s_fs_info = NULL;
57 return;
58}
59
60static int isofs_read_inode(struct inode *, int relocated);
61static int isofs_statfs (struct dentry *, struct kstatfs *);
62static int isofs_show_options(struct seq_file *, struct dentry *);
63
64static struct kmem_cache *isofs_inode_cachep;
65
66static struct inode *isofs_alloc_inode(struct super_block *sb)
67{
68 struct iso_inode_info *ei;
69 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
70 if (!ei)
71 return NULL;
72 return &ei->vfs_inode;
73}
74
75static void isofs_i_callback(struct rcu_head *head)
76{
77 struct inode *inode = container_of(head, struct inode, i_rcu);
78 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
79}
80
81static void isofs_destroy_inode(struct inode *inode)
82{
83 call_rcu(&inode->i_rcu, isofs_i_callback);
84}
85
86static void init_once(void *foo)
87{
88 struct iso_inode_info *ei = foo;
89
90 inode_init_once(&ei->vfs_inode);
91}
92
93static int __init init_inodecache(void)
94{
95 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
96 sizeof(struct iso_inode_info),
97 0, (SLAB_RECLAIM_ACCOUNT|
98 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
99 init_once);
100 if (!isofs_inode_cachep)
101 return -ENOMEM;
102 return 0;
103}
104
105static void destroy_inodecache(void)
106{
107 /*
108 * Make sure all delayed rcu free inodes are flushed before we
109 * destroy cache.
110 */
111 rcu_barrier();
112 kmem_cache_destroy(isofs_inode_cachep);
113}
114
115static int isofs_remount(struct super_block *sb, int *flags, char *data)
116{
117 sync_filesystem(sb);
118 if (!(*flags & MS_RDONLY))
119 return -EROFS;
120 return 0;
121}
122
123static const struct super_operations isofs_sops = {
124 .alloc_inode = isofs_alloc_inode,
125 .destroy_inode = isofs_destroy_inode,
126 .put_super = isofs_put_super,
127 .statfs = isofs_statfs,
128 .remount_fs = isofs_remount,
129 .show_options = isofs_show_options,
130};
131
132
133static const struct dentry_operations isofs_dentry_ops[] = {
134 {
135 .d_hash = isofs_hashi,
136 .d_compare = isofs_dentry_cmpi,
137 },
138#ifdef CONFIG_JOLIET
139 {
140 .d_hash = isofs_hash_ms,
141 .d_compare = isofs_dentry_cmp_ms,
142 },
143 {
144 .d_hash = isofs_hashi_ms,
145 .d_compare = isofs_dentry_cmpi_ms,
146 },
147#endif
148};
149
150struct iso9660_options{
151 unsigned int rock:1;
152 unsigned int joliet:1;
153 unsigned int cruft:1;
154 unsigned int hide:1;
155 unsigned int showassoc:1;
156 unsigned int nocompress:1;
157 unsigned int overriderockperm:1;
158 unsigned int uid_set:1;
159 unsigned int gid_set:1;
160 unsigned int utf8:1;
161 unsigned char map;
162 unsigned char check;
163 unsigned int blocksize;
164 umode_t fmode;
165 umode_t dmode;
166 kgid_t gid;
167 kuid_t uid;
168 char *iocharset;
169 /* LVE */
170 s32 session;
171 s32 sbsector;
172};
173
174/*
175 * Compute the hash for the isofs name corresponding to the dentry.
176 */
177static int
178isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
179{
180 const char *name;
181 int len;
182 char c;
183 unsigned long hash;
184
185 len = qstr->len;
186 name = qstr->name;
187 if (ms) {
188 while (len && name[len-1] == '.')
189 len--;
190 }
191
192 hash = init_name_hash(dentry);
193 while (len--) {
194 c = tolower(*name++);
195 hash = partial_name_hash(c, hash);
196 }
197 qstr->hash = end_name_hash(hash);
198
199 return 0;
200}
201
202/*
203 * Compare of two isofs names.
204 */
205static int isofs_dentry_cmp_common(
206 unsigned int len, const char *str,
207 const struct qstr *name, int ms, int ci)
208{
209 int alen, blen;
210
211 /* A filename cannot end in '.' or we treat it like it has none */
212 alen = name->len;
213 blen = len;
214 if (ms) {
215 while (alen && name->name[alen-1] == '.')
216 alen--;
217 while (blen && str[blen-1] == '.')
218 blen--;
219 }
220 if (alen == blen) {
221 if (ci) {
222 if (strncasecmp(name->name, str, alen) == 0)
223 return 0;
224 } else {
225 if (strncmp(name->name, str, alen) == 0)
226 return 0;
227 }
228 }
229 return 1;
230}
231
232static int
233isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
234{
235 return isofs_hashi_common(dentry, qstr, 0);
236}
237
238static int
239isofs_dentry_cmpi(const struct dentry *dentry,
240 unsigned int len, const char *str, const struct qstr *name)
241{
242 return isofs_dentry_cmp_common(len, str, name, 0, 1);
243}
244
245#ifdef CONFIG_JOLIET
246/*
247 * Compute the hash for the isofs name corresponding to the dentry.
248 */
249static int
250isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
251{
252 const char *name;
253 int len;
254
255 len = qstr->len;
256 name = qstr->name;
257 if (ms) {
258 while (len && name[len-1] == '.')
259 len--;
260 }
261
262 qstr->hash = full_name_hash(dentry, name, len);
263
264 return 0;
265}
266
267static int
268isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
269{
270 return isofs_hash_common(dentry, qstr, 1);
271}
272
273static int
274isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
275{
276 return isofs_hashi_common(dentry, qstr, 1);
277}
278
279static int
280isofs_dentry_cmp_ms(const struct dentry *dentry,
281 unsigned int len, const char *str, const struct qstr *name)
282{
283 return isofs_dentry_cmp_common(len, str, name, 1, 0);
284}
285
286static int
287isofs_dentry_cmpi_ms(const struct dentry *dentry,
288 unsigned int len, const char *str, const struct qstr *name)
289{
290 return isofs_dentry_cmp_common(len, str, name, 1, 1);
291}
292#endif
293
294enum {
295 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
296 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
297 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
298 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
299};
300
301static const match_table_t tokens = {
302 {Opt_norock, "norock"},
303 {Opt_nojoliet, "nojoliet"},
304 {Opt_unhide, "unhide"},
305 {Opt_hide, "hide"},
306 {Opt_showassoc, "showassoc"},
307 {Opt_cruft, "cruft"},
308 {Opt_utf8, "utf8"},
309 {Opt_iocharset, "iocharset=%s"},
310 {Opt_map_a, "map=acorn"},
311 {Opt_map_a, "map=a"},
312 {Opt_map_n, "map=normal"},
313 {Opt_map_n, "map=n"},
314 {Opt_map_o, "map=off"},
315 {Opt_map_o, "map=o"},
316 {Opt_session, "session=%u"},
317 {Opt_sb, "sbsector=%u"},
318 {Opt_check_r, "check=relaxed"},
319 {Opt_check_r, "check=r"},
320 {Opt_check_s, "check=strict"},
321 {Opt_check_s, "check=s"},
322 {Opt_uid, "uid=%u"},
323 {Opt_gid, "gid=%u"},
324 {Opt_mode, "mode=%u"},
325 {Opt_dmode, "dmode=%u"},
326 {Opt_overriderockperm, "overriderockperm"},
327 {Opt_block, "block=%u"},
328 {Opt_ignore, "conv=binary"},
329 {Opt_ignore, "conv=b"},
330 {Opt_ignore, "conv=text"},
331 {Opt_ignore, "conv=t"},
332 {Opt_ignore, "conv=mtext"},
333 {Opt_ignore, "conv=m"},
334 {Opt_ignore, "conv=auto"},
335 {Opt_ignore, "conv=a"},
336 {Opt_nocompress, "nocompress"},
337 {Opt_err, NULL}
338};
339
340static int parse_options(char *options, struct iso9660_options *popt)
341{
342 char *p;
343 int option;
344
345 popt->map = 'n';
346 popt->rock = 1;
347 popt->joliet = 1;
348 popt->cruft = 0;
349 popt->hide = 0;
350 popt->showassoc = 0;
351 popt->check = 'u'; /* unset */
352 popt->nocompress = 0;
353 popt->blocksize = 1024;
354 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
355 popt->uid_set = 0;
356 popt->gid_set = 0;
357 popt->gid = GLOBAL_ROOT_GID;
358 popt->uid = GLOBAL_ROOT_UID;
359 popt->iocharset = NULL;
360 popt->utf8 = 0;
361 popt->overriderockperm = 0;
362 popt->session=-1;
363 popt->sbsector=-1;
364 if (!options)
365 return 1;
366
367 while ((p = strsep(&options, ",")) != NULL) {
368 int token;
369 substring_t args[MAX_OPT_ARGS];
370 unsigned n;
371
372 if (!*p)
373 continue;
374
375 token = match_token(p, tokens, args);
376 switch (token) {
377 case Opt_norock:
378 popt->rock = 0;
379 break;
380 case Opt_nojoliet:
381 popt->joliet = 0;
382 break;
383 case Opt_hide:
384 popt->hide = 1;
385 break;
386 case Opt_unhide:
387 case Opt_showassoc:
388 popt->showassoc = 1;
389 break;
390 case Opt_cruft:
391 popt->cruft = 1;
392 break;
393 case Opt_utf8:
394 popt->utf8 = 1;
395 break;
396#ifdef CONFIG_JOLIET
397 case Opt_iocharset:
398 kfree(popt->iocharset);
399 popt->iocharset = match_strdup(&args[0]);
400 if (!popt->iocharset)
401 return 0;
402 break;
403#endif
404 case Opt_map_a:
405 popt->map = 'a';
406 break;
407 case Opt_map_o:
408 popt->map = 'o';
409 break;
410 case Opt_map_n:
411 popt->map = 'n';
412 break;
413 case Opt_session:
414 if (match_int(&args[0], &option))
415 return 0;
416 n = option;
417 /*
418 * Track numbers are supposed to be in range 1-99, the
419 * mount option starts indexing at 0.
420 */
421 if (n >= 99)
422 return 0;
423 popt->session = n + 1;
424 break;
425 case Opt_sb:
426 if (match_int(&args[0], &option))
427 return 0;
428 popt->sbsector = option;
429 break;
430 case Opt_check_r:
431 popt->check = 'r';
432 break;
433 case Opt_check_s:
434 popt->check = 's';
435 break;
436 case Opt_ignore:
437 break;
438 case Opt_uid:
439 if (match_int(&args[0], &option))
440 return 0;
441 popt->uid = make_kuid(current_user_ns(), option);
442 if (!uid_valid(popt->uid))
443 return 0;
444 popt->uid_set = 1;
445 break;
446 case Opt_gid:
447 if (match_int(&args[0], &option))
448 return 0;
449 popt->gid = make_kgid(current_user_ns(), option);
450 if (!gid_valid(popt->gid))
451 return 0;
452 popt->gid_set = 1;
453 break;
454 case Opt_mode:
455 if (match_int(&args[0], &option))
456 return 0;
457 popt->fmode = option;
458 break;
459 case Opt_dmode:
460 if (match_int(&args[0], &option))
461 return 0;
462 popt->dmode = option;
463 break;
464 case Opt_overriderockperm:
465 popt->overriderockperm = 1;
466 break;
467 case Opt_block:
468 if (match_int(&args[0], &option))
469 return 0;
470 n = option;
471 if (n != 512 && n != 1024 && n != 2048)
472 return 0;
473 popt->blocksize = n;
474 break;
475 case Opt_nocompress:
476 popt->nocompress = 1;
477 break;
478 default:
479 return 0;
480 }
481 }
482 return 1;
483}
484
485/*
486 * Display the mount options in /proc/mounts.
487 */
488static int isofs_show_options(struct seq_file *m, struct dentry *root)
489{
490 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
491
492 if (!sbi->s_rock) seq_puts(m, ",norock");
493 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
494 if (sbi->s_cruft) seq_puts(m, ",cruft");
495 if (sbi->s_hide) seq_puts(m, ",hide");
496 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
497 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
498 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
499 if (sbi->s_utf8) seq_puts(m, ",utf8");
500
501 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
502 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
503 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
504 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
505
506 if (root->d_sb->s_blocksize != 1024)
507 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
508
509 if (sbi->s_uid_set)
510 seq_printf(m, ",uid=%u",
511 from_kuid_munged(&init_user_ns, sbi->s_uid));
512 if (sbi->s_gid_set)
513 seq_printf(m, ",gid=%u",
514 from_kgid_munged(&init_user_ns, sbi->s_gid));
515
516 if (sbi->s_dmode != ISOFS_INVALID_MODE)
517 seq_printf(m, ",dmode=%o", sbi->s_dmode);
518 if (sbi->s_fmode != ISOFS_INVALID_MODE)
519 seq_printf(m, ",fmode=%o", sbi->s_fmode);
520
521#ifdef CONFIG_JOLIET
522 if (sbi->s_nls_iocharset &&
523 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
524 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
525#endif
526 return 0;
527}
528
529/*
530 * look if the driver can tell the multi session redirection value
531 *
532 * don't change this if you don't know what you do, please!
533 * Multisession is legal only with XA disks.
534 * A non-XA disk with more than one volume descriptor may do it right, but
535 * usually is written in a nowhere standardized "multi-partition" manner.
536 * Multisession uses absolute addressing (solely the first frame of the whole
537 * track is #0), multi-partition uses relative addressing (each first frame of
538 * each track is #0), and a track is not a session.
539 *
540 * A broken CDwriter software or drive firmware does not set new standards,
541 * at least not if conflicting with the existing ones.
542 *
543 * emoenke@gwdg.de
544 */
545#define WE_OBEY_THE_WRITTEN_STANDARDS 1
546
547static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
548{
549 struct cdrom_multisession ms_info;
550 unsigned int vol_desc_start;
551 struct block_device *bdev = sb->s_bdev;
552 int i;
553
554 vol_desc_start=0;
555 ms_info.addr_format=CDROM_LBA;
556 if (session > 0) {
557 struct cdrom_tocentry Te;
558 Te.cdte_track=session;
559 Te.cdte_format=CDROM_LBA;
560 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
561 if (!i) {
562 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
563 session, Te.cdte_addr.lba,
564 Te.cdte_ctrl&CDROM_DATA_TRACK);
565 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
566 return Te.cdte_addr.lba;
567 }
568
569 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
570 }
571 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
572 if (session > 0)
573 printk(KERN_ERR "ISOFS: Invalid session number\n");
574#if 0
575 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
576 if (i==0) {
577 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
578 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
579 }
580#endif
581 if (i==0)
582#if WE_OBEY_THE_WRITTEN_STANDARDS
583 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
584#endif
585 vol_desc_start=ms_info.addr.lba;
586 return vol_desc_start;
587}
588
589/*
590 * Check if root directory is empty (has less than 3 files).
591 *
592 * Used to detect broken CDs where ISO root directory is empty but Joliet root
593 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
594 * (and Joliet used instead) or else no files would be visible.
595 */
596static bool rootdir_empty(struct super_block *sb, unsigned long block)
597{
598 int offset = 0, files = 0, de_len;
599 struct iso_directory_record *de;
600 struct buffer_head *bh;
601
602 bh = sb_bread(sb, block);
603 if (!bh)
604 return true;
605 while (files < 3) {
606 de = (struct iso_directory_record *) (bh->b_data + offset);
607 de_len = *(unsigned char *) de;
608 if (de_len == 0)
609 break;
610 files++;
611 offset += de_len;
612 }
613 brelse(bh);
614 return files < 3;
615}
616
617/*
618 * Initialize the superblock and read the root inode.
619 *
620 * Note: a check_disk_change() has been done immediately prior
621 * to this call, so we don't need to check again.
622 */
623static int isofs_fill_super(struct super_block *s, void *data, int silent)
624{
625 struct buffer_head *bh = NULL, *pri_bh = NULL;
626 struct hs_primary_descriptor *h_pri = NULL;
627 struct iso_primary_descriptor *pri = NULL;
628 struct iso_supplementary_descriptor *sec = NULL;
629 struct iso_directory_record *rootp;
630 struct inode *inode;
631 struct iso9660_options opt;
632 struct isofs_sb_info *sbi;
633 unsigned long first_data_zone;
634 int joliet_level = 0;
635 int iso_blknum, block;
636 int orig_zonesize;
637 int table, error = -EINVAL;
638 unsigned int vol_desc_start;
639
640 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
641 if (!sbi)
642 return -ENOMEM;
643 s->s_fs_info = sbi;
644
645 if (!parse_options((char *)data, &opt))
646 goto out_freesbi;
647
648 /*
649 * First of all, get the hardware blocksize for this device.
650 * If we don't know what it is, or the hardware blocksize is
651 * larger than the blocksize the user specified, then use
652 * that value.
653 */
654 /*
655 * What if bugger tells us to go beyond page size?
656 */
657 if (bdev_logical_block_size(s->s_bdev) > 2048) {
658 printk(KERN_WARNING
659 "ISOFS: unsupported/invalid hardware sector size %d\n",
660 bdev_logical_block_size(s->s_bdev));
661 goto out_freesbi;
662 }
663 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
664
665 sbi->s_high_sierra = 0; /* default is iso9660 */
666 sbi->s_session = opt.session;
667 sbi->s_sbsector = opt.sbsector;
668
669 vol_desc_start = (opt.sbsector != -1) ?
670 opt.sbsector : isofs_get_last_session(s,opt.session);
671
672 for (iso_blknum = vol_desc_start+16;
673 iso_blknum < vol_desc_start+100; iso_blknum++) {
674 struct hs_volume_descriptor *hdp;
675 struct iso_volume_descriptor *vdp;
676
677 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
678 if (!(bh = sb_bread(s, block)))
679 goto out_no_read;
680
681 vdp = (struct iso_volume_descriptor *)bh->b_data;
682 hdp = (struct hs_volume_descriptor *)bh->b_data;
683
684 /*
685 * Due to the overlapping physical location of the descriptors,
686 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
687 * proper identification in this case, we first check for ISO.
688 */
689 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
690 if (isonum_711(vdp->type) == ISO_VD_END)
691 break;
692 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
693 if (!pri) {
694 pri = (struct iso_primary_descriptor *)vdp;
695 /* Save the buffer in case we need it ... */
696 pri_bh = bh;
697 bh = NULL;
698 }
699 }
700#ifdef CONFIG_JOLIET
701 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
702 sec = (struct iso_supplementary_descriptor *)vdp;
703 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
704 if (opt.joliet) {
705 if (sec->escape[2] == 0x40)
706 joliet_level = 1;
707 else if (sec->escape[2] == 0x43)
708 joliet_level = 2;
709 else if (sec->escape[2] == 0x45)
710 joliet_level = 3;
711
712 printk(KERN_DEBUG "ISO 9660 Extensions: "
713 "Microsoft Joliet Level %d\n",
714 joliet_level);
715 }
716 goto root_found;
717 } else {
718 /* Unknown supplementary volume descriptor */
719 sec = NULL;
720 }
721 }
722#endif
723 } else {
724 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
725 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
726 goto out_freebh;
727
728 sbi->s_high_sierra = 1;
729 opt.rock = 0;
730 h_pri = (struct hs_primary_descriptor *)vdp;
731 goto root_found;
732 }
733 }
734
735 /* Just skip any volume descriptors we don't recognize */
736
737 brelse(bh);
738 bh = NULL;
739 }
740 /*
741 * If we fall through, either no volume descriptor was found,
742 * or else we passed a primary descriptor looking for others.
743 */
744 if (!pri)
745 goto out_unknown_format;
746 brelse(bh);
747 bh = pri_bh;
748 pri_bh = NULL;
749
750root_found:
751 /* We don't support read-write mounts */
752 if (!sb_rdonly(s)) {
753 error = -EACCES;
754 goto out_freebh;
755 }
756
757 if (joliet_level && (!pri || !opt.rock)) {
758 /* This is the case of Joliet with the norock mount flag.
759 * A disc with both Joliet and Rock Ridge is handled later
760 */
761 pri = (struct iso_primary_descriptor *) sec;
762 }
763
764 if(sbi->s_high_sierra){
765 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
766 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
767 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
768 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
769 } else {
770 if (!pri)
771 goto out_freebh;
772 rootp = (struct iso_directory_record *) pri->root_directory_record;
773 sbi->s_nzones = isonum_733(pri->volume_space_size);
774 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
775 sbi->s_max_size = isonum_733(pri->volume_space_size);
776 }
777
778 sbi->s_ninodes = 0; /* No way to figure this out easily */
779
780 orig_zonesize = sbi->s_log_zone_size;
781 /*
782 * If the zone size is smaller than the hardware sector size,
783 * this is a fatal error. This would occur if the disc drive
784 * had sectors that were 2048 bytes, but the filesystem had
785 * blocks that were 512 bytes (which should only very rarely
786 * happen.)
787 */
788 if (orig_zonesize < opt.blocksize)
789 goto out_bad_size;
790
791 /* RDE: convert log zone size to bit shift */
792 switch (sbi->s_log_zone_size) {
793 case 512: sbi->s_log_zone_size = 9; break;
794 case 1024: sbi->s_log_zone_size = 10; break;
795 case 2048: sbi->s_log_zone_size = 11; break;
796
797 default:
798 goto out_bad_zone_size;
799 }
800
801 s->s_magic = ISOFS_SUPER_MAGIC;
802
803 /*
804 * With multi-extent files, file size is only limited by the maximum
805 * size of a file system, which is 8 TB.
806 */
807 s->s_maxbytes = 0x80000000000LL;
808
809 /* Set this for reference. Its not currently used except on write
810 which we don't have .. */
811
812 first_data_zone = isonum_733(rootp->extent) +
813 isonum_711(rootp->ext_attr_length);
814 sbi->s_firstdatazone = first_data_zone;
815#ifndef BEQUIET
816 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
817 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
818 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
819 if(sbi->s_high_sierra)
820 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
821#endif
822
823 /*
824 * If the Joliet level is set, we _may_ decide to use the
825 * secondary descriptor, but can't be sure until after we
826 * read the root inode. But before reading the root inode
827 * we may need to change the device blocksize, and would
828 * rather release the old buffer first. So, we cache the
829 * first_data_zone value from the secondary descriptor.
830 */
831 if (joliet_level) {
832 pri = (struct iso_primary_descriptor *) sec;
833 rootp = (struct iso_directory_record *)
834 pri->root_directory_record;
835 first_data_zone = isonum_733(rootp->extent) +
836 isonum_711(rootp->ext_attr_length);
837 }
838
839 /*
840 * We're all done using the volume descriptor, and may need
841 * to change the device blocksize, so release the buffer now.
842 */
843 brelse(pri_bh);
844 brelse(bh);
845
846 /*
847 * Force the blocksize to 512 for 512 byte sectors. The file
848 * read primitives really get it wrong in a bad way if we don't
849 * do this.
850 *
851 * Note - we should never be setting the blocksize to something
852 * less than the hardware sector size for the device. If we
853 * do, we would end up having to read larger buffers and split
854 * out portions to satisfy requests.
855 *
856 * Note2- the idea here is that we want to deal with the optimal
857 * zonesize in the filesystem. If we have it set to something less,
858 * then we have horrible problems with trying to piece together
859 * bits of adjacent blocks in order to properly read directory
860 * entries. By forcing the blocksize in this way, we ensure
861 * that we will never be required to do this.
862 */
863 sb_set_blocksize(s, orig_zonesize);
864
865 sbi->s_nls_iocharset = NULL;
866
867#ifdef CONFIG_JOLIET
868 if (joliet_level && opt.utf8 == 0) {
869 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
870 sbi->s_nls_iocharset = load_nls(p);
871 if (! sbi->s_nls_iocharset) {
872 /* Fail only if explicit charset specified */
873 if (opt.iocharset)
874 goto out_freesbi;
875 sbi->s_nls_iocharset = load_nls_default();
876 }
877 }
878#endif
879 s->s_op = &isofs_sops;
880 s->s_export_op = &isofs_export_ops;
881 sbi->s_mapping = opt.map;
882 sbi->s_rock = (opt.rock ? 2 : 0);
883 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
884 sbi->s_cruft = opt.cruft;
885 sbi->s_hide = opt.hide;
886 sbi->s_showassoc = opt.showassoc;
887 sbi->s_uid = opt.uid;
888 sbi->s_gid = opt.gid;
889 sbi->s_uid_set = opt.uid_set;
890 sbi->s_gid_set = opt.gid_set;
891 sbi->s_utf8 = opt.utf8;
892 sbi->s_nocompress = opt.nocompress;
893 sbi->s_overriderockperm = opt.overriderockperm;
894 /*
895 * It would be incredibly stupid to allow people to mark every file
896 * on the disk as suid, so we merely allow them to set the default
897 * permissions.
898 */
899 if (opt.fmode != ISOFS_INVALID_MODE)
900 sbi->s_fmode = opt.fmode & 0777;
901 else
902 sbi->s_fmode = ISOFS_INVALID_MODE;
903 if (opt.dmode != ISOFS_INVALID_MODE)
904 sbi->s_dmode = opt.dmode & 0777;
905 else
906 sbi->s_dmode = ISOFS_INVALID_MODE;
907
908 /*
909 * Read the root inode, which _may_ result in changing
910 * the s_rock flag. Once we have the final s_rock value,
911 * we then decide whether to use the Joliet descriptor.
912 */
913 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
914 if (IS_ERR(inode))
915 goto out_no_root;
916
917 /*
918 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
919 * correct Joliet root directory.
920 */
921 if (sbi->s_rock == 1 && joliet_level &&
922 rootdir_empty(s, sbi->s_firstdatazone)) {
923 printk(KERN_NOTICE
924 "ISOFS: primary root directory is empty. "
925 "Disabling Rock Ridge and switching to Joliet.");
926 sbi->s_rock = 0;
927 }
928
929 /*
930 * If this disk has both Rock Ridge and Joliet on it, then we
931 * want to use Rock Ridge by default. This can be overridden
932 * by using the norock mount option. There is still one other
933 * possibility that is not taken into account: a Rock Ridge
934 * CD with Unicode names. Until someone sees such a beast, it
935 * will not be supported.
936 */
937 if (sbi->s_rock == 1) {
938 joliet_level = 0;
939 } else if (joliet_level) {
940 sbi->s_rock = 0;
941 if (sbi->s_firstdatazone != first_data_zone) {
942 sbi->s_firstdatazone = first_data_zone;
943 printk(KERN_DEBUG
944 "ISOFS: changing to secondary root\n");
945 iput(inode);
946 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
947 if (IS_ERR(inode))
948 goto out_no_root;
949 }
950 }
951
952 if (opt.check == 'u') {
953 /* Only Joliet is case insensitive by default */
954 if (joliet_level)
955 opt.check = 'r';
956 else
957 opt.check = 's';
958 }
959 sbi->s_joliet_level = joliet_level;
960
961 /* Make sure the root inode is a directory */
962 if (!S_ISDIR(inode->i_mode)) {
963 printk(KERN_WARNING
964 "isofs_fill_super: root inode is not a directory. "
965 "Corrupted media?\n");
966 goto out_iput;
967 }
968
969 table = 0;
970 if (joliet_level)
971 table += 2;
972 if (opt.check == 'r')
973 table++;
974 sbi->s_check = opt.check;
975
976 if (table)
977 s->s_d_op = &isofs_dentry_ops[table - 1];
978
979 /* get the root dentry */
980 s->s_root = d_make_root(inode);
981 if (!(s->s_root)) {
982 error = -ENOMEM;
983 goto out_no_inode;
984 }
985
986 kfree(opt.iocharset);
987
988 return 0;
989
990 /*
991 * Display error messages and free resources.
992 */
993out_iput:
994 iput(inode);
995 goto out_no_inode;
996out_no_root:
997 error = PTR_ERR(inode);
998 if (error != -ENOMEM)
999 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
1000out_no_inode:
1001#ifdef CONFIG_JOLIET
1002 unload_nls(sbi->s_nls_iocharset);
1003#endif
1004 goto out_freesbi;
1005out_no_read:
1006 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1007 __func__, s->s_id, iso_blknum, block);
1008 goto out_freebh;
1009out_bad_zone_size:
1010 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1011 sbi->s_log_zone_size);
1012 goto out_freebh;
1013out_bad_size:
1014 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1015 orig_zonesize, opt.blocksize);
1016 goto out_freebh;
1017out_unknown_format:
1018 if (!silent)
1019 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1020
1021out_freebh:
1022 brelse(bh);
1023 brelse(pri_bh);
1024out_freesbi:
1025 kfree(opt.iocharset);
1026 kfree(sbi);
1027 s->s_fs_info = NULL;
1028 return error;
1029}
1030
1031static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1032{
1033 struct super_block *sb = dentry->d_sb;
1034 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1035
1036 buf->f_type = ISOFS_SUPER_MAGIC;
1037 buf->f_bsize = sb->s_blocksize;
1038 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1039 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1040 buf->f_bfree = 0;
1041 buf->f_bavail = 0;
1042 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1043 buf->f_ffree = 0;
1044 buf->f_fsid.val[0] = (u32)id;
1045 buf->f_fsid.val[1] = (u32)(id >> 32);
1046 buf->f_namelen = NAME_MAX;
1047 return 0;
1048}
1049
1050/*
1051 * Get a set of blocks; filling in buffer_heads if already allocated
1052 * or getblk() if they are not. Returns the number of blocks inserted
1053 * (-ve == error.)
1054 */
1055int isofs_get_blocks(struct inode *inode, sector_t iblock,
1056 struct buffer_head **bh, unsigned long nblocks)
1057{
1058 unsigned long b_off = iblock;
1059 unsigned offset, sect_size;
1060 unsigned int firstext;
1061 unsigned long nextblk, nextoff;
1062 int section, rv, error;
1063 struct iso_inode_info *ei = ISOFS_I(inode);
1064
1065 error = -EIO;
1066 rv = 0;
1067 if (iblock != b_off) {
1068 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1069 goto abort;
1070 }
1071
1072
1073 offset = 0;
1074 firstext = ei->i_first_extent;
1075 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1076 nextblk = ei->i_next_section_block;
1077 nextoff = ei->i_next_section_offset;
1078 section = 0;
1079
1080 while (nblocks) {
1081 /* If we are *way* beyond the end of the file, print a message.
1082 * Access beyond the end of the file up to the next page boundary
1083 * is normal, however because of the way the page cache works.
1084 * In this case, we just return 0 so that we can properly fill
1085 * the page with useless information without generating any
1086 * I/O errors.
1087 */
1088 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1089 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1090 __func__, b_off,
1091 (unsigned long long)inode->i_size);
1092 goto abort;
1093 }
1094
1095 /* On the last section, nextblk == 0, section size is likely to
1096 * exceed sect_size by a partial block, and access beyond the
1097 * end of the file will reach beyond the section size, too.
1098 */
1099 while (nextblk && (b_off >= (offset + sect_size))) {
1100 struct inode *ninode;
1101
1102 offset += sect_size;
1103 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1104 if (IS_ERR(ninode)) {
1105 error = PTR_ERR(ninode);
1106 goto abort;
1107 }
1108 firstext = ISOFS_I(ninode)->i_first_extent;
1109 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1110 nextblk = ISOFS_I(ninode)->i_next_section_block;
1111 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1112 iput(ninode);
1113
1114 if (++section > 100) {
1115 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1116 " aborting...\n", __func__);
1117 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1118 "nextblk=%lu nextoff=%lu\n", __func__,
1119 b_off, firstext, (unsigned) sect_size,
1120 nextblk, nextoff);
1121 goto abort;
1122 }
1123 }
1124
1125 if (*bh) {
1126 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1127 } else {
1128 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1129 if (!*bh)
1130 goto abort;
1131 }
1132 bh++; /* Next buffer head */
1133 b_off++; /* Next buffer offset */
1134 nblocks--;
1135 rv++;
1136 }
1137
1138 error = 0;
1139abort:
1140 return rv != 0 ? rv : error;
1141}
1142
1143/*
1144 * Used by the standard interfaces.
1145 */
1146static int isofs_get_block(struct inode *inode, sector_t iblock,
1147 struct buffer_head *bh_result, int create)
1148{
1149 int ret;
1150
1151 if (create) {
1152 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1153 return -EROFS;
1154 }
1155
1156 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1157 return ret < 0 ? ret : 0;
1158}
1159
1160static int isofs_bmap(struct inode *inode, sector_t block)
1161{
1162 struct buffer_head dummy;
1163 int error;
1164
1165 dummy.b_state = 0;
1166 dummy.b_blocknr = -1000;
1167 error = isofs_get_block(inode, block, &dummy, 0);
1168 if (!error)
1169 return dummy.b_blocknr;
1170 return 0;
1171}
1172
1173struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1174{
1175 sector_t blknr = isofs_bmap(inode, block);
1176 if (!blknr)
1177 return NULL;
1178 return sb_bread(inode->i_sb, blknr);
1179}
1180
1181static int isofs_readpage(struct file *file, struct page *page)
1182{
1183 return mpage_readpage(page, isofs_get_block);
1184}
1185
1186static int isofs_readpages(struct file *file, struct address_space *mapping,
1187 struct list_head *pages, unsigned nr_pages)
1188{
1189 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1190}
1191
1192static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1193{
1194 return generic_block_bmap(mapping,block,isofs_get_block);
1195}
1196
1197static const struct address_space_operations isofs_aops = {
1198 .readpage = isofs_readpage,
1199 .readpages = isofs_readpages,
1200 .bmap = _isofs_bmap
1201};
1202
1203static int isofs_read_level3_size(struct inode *inode)
1204{
1205 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1206 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1207 struct buffer_head *bh = NULL;
1208 unsigned long block, offset, block_saved, offset_saved;
1209 int i = 0;
1210 int more_entries = 0;
1211 struct iso_directory_record *tmpde = NULL;
1212 struct iso_inode_info *ei = ISOFS_I(inode);
1213
1214 inode->i_size = 0;
1215
1216 /* The first 16 blocks are reserved as the System Area. Thus,
1217 * no inodes can appear in block 0. We use this to flag that
1218 * this is the last section. */
1219 ei->i_next_section_block = 0;
1220 ei->i_next_section_offset = 0;
1221
1222 block = ei->i_iget5_block;
1223 offset = ei->i_iget5_offset;
1224
1225 do {
1226 struct iso_directory_record *de;
1227 unsigned int de_len;
1228
1229 if (!bh) {
1230 bh = sb_bread(inode->i_sb, block);
1231 if (!bh)
1232 goto out_noread;
1233 }
1234 de = (struct iso_directory_record *) (bh->b_data + offset);
1235 de_len = *(unsigned char *) de;
1236
1237 if (de_len == 0) {
1238 brelse(bh);
1239 bh = NULL;
1240 ++block;
1241 offset = 0;
1242 continue;
1243 }
1244
1245 block_saved = block;
1246 offset_saved = offset;
1247 offset += de_len;
1248
1249 /* Make sure we have a full directory entry */
1250 if (offset >= bufsize) {
1251 int slop = bufsize - offset + de_len;
1252 if (!tmpde) {
1253 tmpde = kmalloc(256, GFP_KERNEL);
1254 if (!tmpde)
1255 goto out_nomem;
1256 }
1257 memcpy(tmpde, de, slop);
1258 offset &= bufsize - 1;
1259 block++;
1260 brelse(bh);
1261 bh = NULL;
1262 if (offset) {
1263 bh = sb_bread(inode->i_sb, block);
1264 if (!bh)
1265 goto out_noread;
1266 memcpy((void *)tmpde+slop, bh->b_data, offset);
1267 }
1268 de = tmpde;
1269 }
1270
1271 inode->i_size += isonum_733(de->size);
1272 if (i == 1) {
1273 ei->i_next_section_block = block_saved;
1274 ei->i_next_section_offset = offset_saved;
1275 }
1276
1277 more_entries = de->flags[-high_sierra] & 0x80;
1278
1279 i++;
1280 if (i > 100)
1281 goto out_toomany;
1282 } while (more_entries);
1283out:
1284 kfree(tmpde);
1285 if (bh)
1286 brelse(bh);
1287 return 0;
1288
1289out_nomem:
1290 if (bh)
1291 brelse(bh);
1292 return -ENOMEM;
1293
1294out_noread:
1295 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1296 kfree(tmpde);
1297 return -EIO;
1298
1299out_toomany:
1300 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1301 "isofs_read_level3_size: inode=%lu\n",
1302 __func__, inode->i_ino);
1303 goto out;
1304}
1305
1306static int isofs_read_inode(struct inode *inode, int relocated)
1307{
1308 struct super_block *sb = inode->i_sb;
1309 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1310 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1311 unsigned long block;
1312 int high_sierra = sbi->s_high_sierra;
1313 struct buffer_head *bh;
1314 struct iso_directory_record *de;
1315 struct iso_directory_record *tmpde = NULL;
1316 unsigned int de_len;
1317 unsigned long offset;
1318 struct iso_inode_info *ei = ISOFS_I(inode);
1319 int ret = -EIO;
1320
1321 block = ei->i_iget5_block;
1322 bh = sb_bread(inode->i_sb, block);
1323 if (!bh)
1324 goto out_badread;
1325
1326 offset = ei->i_iget5_offset;
1327
1328 de = (struct iso_directory_record *) (bh->b_data + offset);
1329 de_len = *(unsigned char *) de;
1330
1331 if (offset + de_len > bufsize) {
1332 int frag1 = bufsize - offset;
1333
1334 tmpde = kmalloc(de_len, GFP_KERNEL);
1335 if (!tmpde) {
1336 ret = -ENOMEM;
1337 goto fail;
1338 }
1339 memcpy(tmpde, bh->b_data + offset, frag1);
1340 brelse(bh);
1341 bh = sb_bread(inode->i_sb, ++block);
1342 if (!bh)
1343 goto out_badread;
1344 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1345 de = tmpde;
1346 }
1347
1348 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1349 ei->i_iget5_offset,
1350 ISOFS_BUFFER_BITS(inode));
1351
1352 /* Assume it is a normal-format file unless told otherwise */
1353 ei->i_file_format = isofs_file_normal;
1354
1355 if (de->flags[-high_sierra] & 2) {
1356 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1357 inode->i_mode = S_IFDIR | sbi->s_dmode;
1358 else
1359 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1360 set_nlink(inode, 1); /*
1361 * Set to 1. We know there are 2, but
1362 * the find utility tries to optimize
1363 * if it is 2, and it screws up. It is
1364 * easier to give 1 which tells find to
1365 * do it the hard way.
1366 */
1367 } else {
1368 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1369 inode->i_mode = S_IFREG | sbi->s_fmode;
1370 } else {
1371 /*
1372 * Set default permissions: r-x for all. The disc
1373 * could be shared with DOS machines so virtually
1374 * anything could be a valid executable.
1375 */
1376 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1377 }
1378 set_nlink(inode, 1);
1379 }
1380 inode->i_uid = sbi->s_uid;
1381 inode->i_gid = sbi->s_gid;
1382 inode->i_blocks = 0;
1383
1384 ei->i_format_parm[0] = 0;
1385 ei->i_format_parm[1] = 0;
1386 ei->i_format_parm[2] = 0;
1387
1388 ei->i_section_size = isonum_733(de->size);
1389 if (de->flags[-high_sierra] & 0x80) {
1390 ret = isofs_read_level3_size(inode);
1391 if (ret < 0)
1392 goto fail;
1393 ret = -EIO;
1394 } else {
1395 ei->i_next_section_block = 0;
1396 ei->i_next_section_offset = 0;
1397 inode->i_size = isonum_733(de->size);
1398 }
1399
1400 /*
1401 * Some dipshit decided to store some other bit of information
1402 * in the high byte of the file length. Truncate size in case
1403 * this CDROM was mounted with the cruft option.
1404 */
1405
1406 if (sbi->s_cruft)
1407 inode->i_size &= 0x00ffffff;
1408
1409 if (de->interleave[0]) {
1410 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1411 inode->i_size = 0;
1412 }
1413
1414 /* I have no idea what file_unit_size is used for, so
1415 we will flag it for now */
1416 if (de->file_unit_size[0] != 0) {
1417 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1418 inode->i_ino);
1419 }
1420
1421 /* I have no idea what other flag bits are used for, so
1422 we will flag it for now */
1423#ifdef DEBUG
1424 if((de->flags[-high_sierra] & ~2)!= 0){
1425 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1426 "(%ld %x).\n",
1427 inode->i_ino, de->flags[-high_sierra]);
1428 }
1429#endif
1430
1431 inode->i_mtime.tv_sec =
1432 inode->i_atime.tv_sec =
1433 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1434 inode->i_mtime.tv_nsec =
1435 inode->i_atime.tv_nsec =
1436 inode->i_ctime.tv_nsec = 0;
1437
1438 ei->i_first_extent = (isonum_733(de->extent) +
1439 isonum_711(de->ext_attr_length));
1440
1441 /* Set the number of blocks for stat() - should be done before RR */
1442 inode->i_blocks = (inode->i_size + 511) >> 9;
1443
1444 /*
1445 * Now test for possible Rock Ridge extensions which will override
1446 * some of these numbers in the inode structure.
1447 */
1448
1449 if (!high_sierra) {
1450 parse_rock_ridge_inode(de, inode, relocated);
1451 /* if we want uid/gid set, override the rock ridge setting */
1452 if (sbi->s_uid_set)
1453 inode->i_uid = sbi->s_uid;
1454 if (sbi->s_gid_set)
1455 inode->i_gid = sbi->s_gid;
1456 }
1457 /* Now set final access rights if overriding rock ridge setting */
1458 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1459 sbi->s_dmode != ISOFS_INVALID_MODE)
1460 inode->i_mode = S_IFDIR | sbi->s_dmode;
1461 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1462 sbi->s_fmode != ISOFS_INVALID_MODE)
1463 inode->i_mode = S_IFREG | sbi->s_fmode;
1464
1465 /* Install the inode operations vector */
1466 if (S_ISREG(inode->i_mode)) {
1467 inode->i_fop = &generic_ro_fops;
1468 switch (ei->i_file_format) {
1469#ifdef CONFIG_ZISOFS
1470 case isofs_file_compressed:
1471 inode->i_data.a_ops = &zisofs_aops;
1472 break;
1473#endif
1474 default:
1475 inode->i_data.a_ops = &isofs_aops;
1476 break;
1477 }
1478 } else if (S_ISDIR(inode->i_mode)) {
1479 inode->i_op = &isofs_dir_inode_operations;
1480 inode->i_fop = &isofs_dir_operations;
1481 } else if (S_ISLNK(inode->i_mode)) {
1482 inode->i_op = &page_symlink_inode_operations;
1483 inode_nohighmem(inode);
1484 inode->i_data.a_ops = &isofs_symlink_aops;
1485 } else
1486 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1487 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1488
1489 ret = 0;
1490out:
1491 kfree(tmpde);
1492 if (bh)
1493 brelse(bh);
1494 return ret;
1495
1496out_badread:
1497 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1498fail:
1499 goto out;
1500}
1501
1502struct isofs_iget5_callback_data {
1503 unsigned long block;
1504 unsigned long offset;
1505};
1506
1507static int isofs_iget5_test(struct inode *ino, void *data)
1508{
1509 struct iso_inode_info *i = ISOFS_I(ino);
1510 struct isofs_iget5_callback_data *d =
1511 (struct isofs_iget5_callback_data*)data;
1512 return (i->i_iget5_block == d->block)
1513 && (i->i_iget5_offset == d->offset);
1514}
1515
1516static int isofs_iget5_set(struct inode *ino, void *data)
1517{
1518 struct iso_inode_info *i = ISOFS_I(ino);
1519 struct isofs_iget5_callback_data *d =
1520 (struct isofs_iget5_callback_data*)data;
1521 i->i_iget5_block = d->block;
1522 i->i_iget5_offset = d->offset;
1523 return 0;
1524}
1525
1526/* Store, in the inode's containing structure, the block and block
1527 * offset that point to the underlying meta-data for the inode. The
1528 * code below is otherwise similar to the iget() code in
1529 * include/linux/fs.h */
1530struct inode *__isofs_iget(struct super_block *sb,
1531 unsigned long block,
1532 unsigned long offset,
1533 int relocated)
1534{
1535 unsigned long hashval;
1536 struct inode *inode;
1537 struct isofs_iget5_callback_data data;
1538 long ret;
1539
1540 if (offset >= 1ul << sb->s_blocksize_bits)
1541 return ERR_PTR(-EINVAL);
1542
1543 data.block = block;
1544 data.offset = offset;
1545
1546 hashval = (block << sb->s_blocksize_bits) | offset;
1547
1548 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1549 &isofs_iget5_set, &data);
1550
1551 if (!inode)
1552 return ERR_PTR(-ENOMEM);
1553
1554 if (inode->i_state & I_NEW) {
1555 ret = isofs_read_inode(inode, relocated);
1556 if (ret < 0) {
1557 iget_failed(inode);
1558 inode = ERR_PTR(ret);
1559 } else {
1560 unlock_new_inode(inode);
1561 }
1562 }
1563
1564 return inode;
1565}
1566
1567static struct dentry *isofs_mount(struct file_system_type *fs_type,
1568 int flags, const char *dev_name, void *data)
1569{
1570 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1571}
1572
1573static struct file_system_type iso9660_fs_type = {
1574 .owner = THIS_MODULE,
1575 .name = "iso9660",
1576 .mount = isofs_mount,
1577 .kill_sb = kill_block_super,
1578 .fs_flags = FS_REQUIRES_DEV,
1579};
1580MODULE_ALIAS_FS("iso9660");
1581MODULE_ALIAS("iso9660");
1582
1583static int __init init_iso9660_fs(void)
1584{
1585 int err = init_inodecache();
1586 if (err)
1587 goto out;
1588#ifdef CONFIG_ZISOFS
1589 err = zisofs_init();
1590 if (err)
1591 goto out1;
1592#endif
1593 err = register_filesystem(&iso9660_fs_type);
1594 if (err)
1595 goto out2;
1596 return 0;
1597out2:
1598#ifdef CONFIG_ZISOFS
1599 zisofs_cleanup();
1600out1:
1601#endif
1602 destroy_inodecache();
1603out:
1604 return err;
1605}
1606
1607static void __exit exit_iso9660_fs(void)
1608{
1609 unregister_filesystem(&iso9660_fs_type);
1610#ifdef CONFIG_ZISOFS
1611 zisofs_cleanup();
1612#endif
1613 destroy_inodecache();
1614}
1615
1616module_init(init_iso9660_fs)
1617module_exit(exit_iso9660_fs)
1618MODULE_LICENSE("GPL");