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Merge branch 'acpi-thermal'
[linux/fpc-iii.git] / fs / isofs / inode.c
blob4556ce1af5b04f5a4f0cd0b4e1ae0515435a1857
1 /*
2 * linux/fs/isofs/inode.c
3 *
4 * (C) 1991 Linus Torvalds - minix filesystem
5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
6 * 1994 Eberhard Mönkeberg - multi session handling.
7 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
8 * 1997 Gordon Chaffee - Joliet CDs
9 * 1998 Eric Lammerts - ISO 9660 Level 3
10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
11 * 2004 Paul Serice - NFS Export Operations
12 */
13
14 #include <linux/init.h>
15 #include <linux/module.h>
16
17 #include <linux/slab.h>
18 #include <linux/nls.h>
19 #include <linux/ctype.h>
20 #include <linux/statfs.h>
21 #include <linux/cdrom.h>
22 #include <linux/parser.h>
23 #include <linux/mpage.h>
24 #include <linux/user_namespace.h>
25
26 #include "isofs.h"
27 #include "zisofs.h"
28
29 #define BEQUIET
30
31 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
32 static int isofs_hash(const struct dentry *parent, struct qstr *qstr);
33 static int isofs_dentry_cmpi(const struct dentry *parent,
34 const struct dentry *dentry,
35 unsigned int len, const char *str, const struct qstr *name);
36 static int isofs_dentry_cmp(const struct dentry *parent,
37 const struct dentry *dentry,
38 unsigned int len, const char *str, const struct qstr *name);
39
40 #ifdef CONFIG_JOLIET
41 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
42 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
43 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
44 const struct dentry *dentry,
45 unsigned int len, const char *str, const struct qstr *name);
46 static int isofs_dentry_cmp_ms(const struct dentry *parent,
47 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 *);
65 static int isofs_statfs (struct dentry *, struct kstatfs *);
66
67 static struct kmem_cache *isofs_inode_cachep;
68
69 static struct inode *isofs_alloc_inode(struct super_block *sb)
70 {
71 struct iso_inode_info *ei;
72 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
73 if (!ei)
74 return NULL;
75 return &ei->vfs_inode;
76 }
77
78 static void isofs_i_callback(struct rcu_head *head)
79 {
80 struct inode *inode = container_of(head, struct inode, i_rcu);
81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
82 }
83
84 static void isofs_destroy_inode(struct inode *inode)
85 {
86 call_rcu(&inode->i_rcu, isofs_i_callback);
87 }
88
89 static void init_once(void *foo)
90 {
91 struct iso_inode_info *ei = foo;
92
93 inode_init_once(&ei->vfs_inode);
94 }
95
96 static int __init init_inodecache(void)
97 {
98 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
99 sizeof(struct iso_inode_info),
100 0, (SLAB_RECLAIM_ACCOUNT|
101 SLAB_MEM_SPREAD),
102 init_once);
103 if (isofs_inode_cachep == NULL)
104 return -ENOMEM;
105 return 0;
106 }
107
108 static void destroy_inodecache(void)
109 {
110 /*
111 * Make sure all delayed rcu free inodes are flushed before we
112 * destroy cache.
113 */
114 rcu_barrier();
115 kmem_cache_destroy(isofs_inode_cachep);
116 }
117
118 static int isofs_remount(struct super_block *sb, int *flags, char *data)
119 {
120 sync_filesystem(sb);
121 if (!(*flags & MS_RDONLY))
122 return -EROFS;
123 return 0;
124 }
125
126 static const struct super_operations isofs_sops = {
127 .alloc_inode = isofs_alloc_inode,
128 .destroy_inode = isofs_destroy_inode,
129 .put_super = isofs_put_super,
130 .statfs = isofs_statfs,
131 .remount_fs = isofs_remount,
132 .show_options = generic_show_options,
133 };
134
135
136 static const struct dentry_operations isofs_dentry_ops[] = {
137 {
138 .d_hash = isofs_hash,
139 .d_compare = isofs_dentry_cmp,
140 },
141 {
142 .d_hash = isofs_hashi,
143 .d_compare = isofs_dentry_cmpi,
144 },
145 #ifdef CONFIG_JOLIET
146 {
147 .d_hash = isofs_hash_ms,
148 .d_compare = isofs_dentry_cmp_ms,
149 },
150 {
151 .d_hash = isofs_hashi_ms,
152 .d_compare = isofs_dentry_cmpi_ms,
153 },
154 #endif
155 };
156
157 struct iso9660_options{
158 unsigned int rock:1;
159 unsigned int joliet:1;
160 unsigned int cruft:1;
161 unsigned int hide:1;
162 unsigned int showassoc:1;
163 unsigned int nocompress:1;
164 unsigned int overriderockperm:1;
165 unsigned int uid_set:1;
166 unsigned int gid_set:1;
167 unsigned int utf8:1;
168 unsigned char map;
169 unsigned char check;
170 unsigned int blocksize;
171 umode_t fmode;
172 umode_t dmode;
173 kgid_t gid;
174 kuid_t uid;
175 char *iocharset;
176 /* LVE */
177 s32 session;
178 s32 sbsector;
179 };
180
181 /*
182 * Compute the hash for the isofs name corresponding to the dentry.
183 */
184 static int
185 isofs_hash_common(struct qstr *qstr, int ms)
186 {
187 const char *name;
188 int len;
189
190 len = qstr->len;
191 name = qstr->name;
192 if (ms) {
193 while (len && name[len-1] == '.')
194 len--;
195 }
196
197 qstr->hash = full_name_hash(name, len);
198
199 return 0;
200 }
201
202 /*
203 * Compute the hash for the isofs name corresponding to the dentry.
204 */
205 static int
206 isofs_hashi_common(struct qstr *qstr, int ms)
207 {
208 const char *name;
209 int len;
210 char c;
211 unsigned long hash;
212
213 len = qstr->len;
214 name = qstr->name;
215 if (ms) {
216 while (len && name[len-1] == '.')
217 len--;
218 }
219
220 hash = init_name_hash();
221 while (len--) {
222 c = tolower(*name++);
223 hash = partial_name_hash(c, hash);
224 }
225 qstr->hash = end_name_hash(hash);
226
227 return 0;
228 }
229
230 /*
231 * Compare of two isofs names.
232 */
233 static int isofs_dentry_cmp_common(
234 unsigned int len, const char *str,
235 const struct qstr *name, int ms, int ci)
236 {
237 int alen, blen;
238
239 /* A filename cannot end in '.' or we treat it like it has none */
240 alen = name->len;
241 blen = len;
242 if (ms) {
243 while (alen && name->name[alen-1] == '.')
244 alen--;
245 while (blen && str[blen-1] == '.')
246 blen--;
247 }
248 if (alen == blen) {
249 if (ci) {
250 if (strnicmp(name->name, str, alen) == 0)
251 return 0;
252 } else {
253 if (strncmp(name->name, str, alen) == 0)
254 return 0;
255 }
256 }
257 return 1;
258 }
259
260 static int
261 isofs_hash(const struct dentry *dentry, struct qstr *qstr)
262 {
263 return isofs_hash_common(qstr, 0);
264 }
265
266 static int
267 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
268 {
269 return isofs_hashi_common(qstr, 0);
270 }
271
272 static int
273 isofs_dentry_cmp(const struct dentry *parent, const struct dentry *dentry,
274 unsigned int len, const char *str, const struct qstr *name)
275 {
276 return isofs_dentry_cmp_common(len, str, name, 0, 0);
277 }
278
279 static int
280 isofs_dentry_cmpi(const struct dentry *parent, 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, 0, 1);
284 }
285
286 #ifdef CONFIG_JOLIET
287 static int
288 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
289 {
290 return isofs_hash_common(qstr, 1);
291 }
292
293 static int
294 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
295 {
296 return isofs_hashi_common(qstr, 1);
297 }
298
299 static int
300 isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry,
301 unsigned int len, const char *str, const struct qstr *name)
302 {
303 return isofs_dentry_cmp_common(len, str, name, 1, 0);
304 }
305
306 static int
307 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
308 unsigned int len, const char *str, const struct qstr *name)
309 {
310 return isofs_dentry_cmp_common(len, str, name, 1, 1);
311 }
312 #endif
313
314 enum {
315 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
316 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
317 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
318 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
319 };
320
321 static const match_table_t tokens = {
322 {Opt_norock, "norock"},
323 {Opt_nojoliet, "nojoliet"},
324 {Opt_unhide, "unhide"},
325 {Opt_hide, "hide"},
326 {Opt_showassoc, "showassoc"},
327 {Opt_cruft, "cruft"},
328 {Opt_utf8, "utf8"},
329 {Opt_iocharset, "iocharset=%s"},
330 {Opt_map_a, "map=acorn"},
331 {Opt_map_a, "map=a"},
332 {Opt_map_n, "map=normal"},
333 {Opt_map_n, "map=n"},
334 {Opt_map_o, "map=off"},
335 {Opt_map_o, "map=o"},
336 {Opt_session, "session=%u"},
337 {Opt_sb, "sbsector=%u"},
338 {Opt_check_r, "check=relaxed"},
339 {Opt_check_r, "check=r"},
340 {Opt_check_s, "check=strict"},
341 {Opt_check_s, "check=s"},
342 {Opt_uid, "uid=%u"},
343 {Opt_gid, "gid=%u"},
344 {Opt_mode, "mode=%u"},
345 {Opt_dmode, "dmode=%u"},
346 {Opt_overriderockperm, "overriderockperm"},
347 {Opt_block, "block=%u"},
348 {Opt_ignore, "conv=binary"},
349 {Opt_ignore, "conv=b"},
350 {Opt_ignore, "conv=text"},
351 {Opt_ignore, "conv=t"},
352 {Opt_ignore, "conv=mtext"},
353 {Opt_ignore, "conv=m"},
354 {Opt_ignore, "conv=auto"},
355 {Opt_ignore, "conv=a"},
356 {Opt_nocompress, "nocompress"},
357 {Opt_err, NULL}
358 };
359
360 static int parse_options(char *options, struct iso9660_options *popt)
361 {
362 char *p;
363 int option;
364
365 popt->map = 'n';
366 popt->rock = 1;
367 popt->joliet = 1;
368 popt->cruft = 0;
369 popt->hide = 0;
370 popt->showassoc = 0;
371 popt->check = 'u'; /* unset */
372 popt->nocompress = 0;
373 popt->blocksize = 1024;
374 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
375 popt->uid_set = 0;
376 popt->gid_set = 0;
377 popt->gid = GLOBAL_ROOT_GID;
378 popt->uid = GLOBAL_ROOT_UID;
379 popt->iocharset = NULL;
380 popt->utf8 = 0;
381 popt->overriderockperm = 0;
382 popt->session=-1;
383 popt->sbsector=-1;
384 if (!options)
385 return 1;
386
387 while ((p = strsep(&options, ",")) != NULL) {
388 int token;
389 substring_t args[MAX_OPT_ARGS];
390 unsigned n;
391
392 if (!*p)
393 continue;
394
395 token = match_token(p, tokens, args);
396 switch (token) {
397 case Opt_norock:
398 popt->rock = 0;
399 break;
400 case Opt_nojoliet:
401 popt->joliet = 0;
402 break;
403 case Opt_hide:
404 popt->hide = 1;
405 break;
406 case Opt_unhide:
407 case Opt_showassoc:
408 popt->showassoc = 1;
409 break;
410 case Opt_cruft:
411 popt->cruft = 1;
412 break;
413 case Opt_utf8:
414 popt->utf8 = 1;
415 break;
416 #ifdef CONFIG_JOLIET
417 case Opt_iocharset:
418 popt->iocharset = match_strdup(&args[0]);
419 break;
420 #endif
421 case Opt_map_a:
422 popt->map = 'a';
423 break;
424 case Opt_map_o:
425 popt->map = 'o';
426 break;
427 case Opt_map_n:
428 popt->map = 'n';
429 break;
430 case Opt_session:
431 if (match_int(&args[0], &option))
432 return 0;
433 n = option;
434 if (n > 99)
435 return 0;
436 popt->session = n + 1;
437 break;
438 case Opt_sb:
439 if (match_int(&args[0], &option))
440 return 0;
441 popt->sbsector = option;
442 break;
443 case Opt_check_r:
444 popt->check = 'r';
445 break;
446 case Opt_check_s:
447 popt->check = 's';
448 break;
449 case Opt_ignore:
450 break;
451 case Opt_uid:
452 if (match_int(&args[0], &option))
453 return 0;
454 popt->uid = make_kuid(current_user_ns(), option);
455 if (!uid_valid(popt->uid))
456 return 0;
457 popt->uid_set = 1;
458 break;
459 case Opt_gid:
460 if (match_int(&args[0], &option))
461 return 0;
462 popt->gid = make_kgid(current_user_ns(), option);
463 if (!gid_valid(popt->gid))
464 return 0;
465 popt->gid_set = 1;
466 break;
467 case Opt_mode:
468 if (match_int(&args[0], &option))
469 return 0;
470 popt->fmode = option;
471 break;
472 case Opt_dmode:
473 if (match_int(&args[0], &option))
474 return 0;
475 popt->dmode = option;
476 break;
477 case Opt_overriderockperm:
478 popt->overriderockperm = 1;
479 break;
480 case Opt_block:
481 if (match_int(&args[0], &option))
482 return 0;
483 n = option;
484 if (n != 512 && n != 1024 && n != 2048)
485 return 0;
486 popt->blocksize = n;
487 break;
488 case Opt_nocompress:
489 popt->nocompress = 1;
490 break;
491 default:
492 return 0;
493 }
494 }
495 return 1;
496 }
497
498 /*
499 * look if the driver can tell the multi session redirection value
500 *
501 * don't change this if you don't know what you do, please!
502 * Multisession is legal only with XA disks.
503 * A non-XA disk with more than one volume descriptor may do it right, but
504 * usually is written in a nowhere standardized "multi-partition" manner.
505 * Multisession uses absolute addressing (solely the first frame of the whole
506 * track is #0), multi-partition uses relative addressing (each first frame of
507 * each track is #0), and a track is not a session.
508 *
509 * A broken CDwriter software or drive firmware does not set new standards,
510 * at least not if conflicting with the existing ones.
511 *
512 * emoenke@gwdg.de
513 */
514 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
515
516 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
517 {
518 struct cdrom_multisession ms_info;
519 unsigned int vol_desc_start;
520 struct block_device *bdev = sb->s_bdev;
521 int i;
522
523 vol_desc_start=0;
524 ms_info.addr_format=CDROM_LBA;
525 if(session >= 0 && session <= 99) {
526 struct cdrom_tocentry Te;
527 Te.cdte_track=session;
528 Te.cdte_format=CDROM_LBA;
529 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
530 if (!i) {
531 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
532 session, Te.cdte_addr.lba,
533 Te.cdte_ctrl&CDROM_DATA_TRACK);
534 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
535 return Te.cdte_addr.lba;
536 }
537
538 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
539 }
540 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
541 if (session > 0)
542 printk(KERN_ERR "ISOFS: Invalid session number\n");
543 #if 0
544 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
545 if (i==0) {
546 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
547 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
548 }
549 #endif
550 if (i==0)
551 #if WE_OBEY_THE_WRITTEN_STANDARDS
552 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
553 #endif
554 vol_desc_start=ms_info.addr.lba;
555 return vol_desc_start;
556 }
557
558 /*
559 * Check if root directory is empty (has less than 3 files).
560 *
561 * Used to detect broken CDs where ISO root directory is empty but Joliet root
562 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
563 * (and Joliet used instead) or else no files would be visible.
564 */
565 static bool rootdir_empty(struct super_block *sb, unsigned long block)
566 {
567 int offset = 0, files = 0, de_len;
568 struct iso_directory_record *de;
569 struct buffer_head *bh;
570
571 bh = sb_bread(sb, block);
572 if (!bh)
573 return true;
574 while (files < 3) {
575 de = (struct iso_directory_record *) (bh->b_data + offset);
576 de_len = *(unsigned char *) de;
577 if (de_len == 0)
578 break;
579 files++;
580 offset += de_len;
581 }
582 brelse(bh);
583 return files < 3;
584 }
585
586 /*
587 * Initialize the superblock and read the root inode.
588 *
589 * Note: a check_disk_change() has been done immediately prior
590 * to this call, so we don't need to check again.
591 */
592 static int isofs_fill_super(struct super_block *s, void *data, int silent)
593 {
594 struct buffer_head *bh = NULL, *pri_bh = NULL;
595 struct hs_primary_descriptor *h_pri = NULL;
596 struct iso_primary_descriptor *pri = NULL;
597 struct iso_supplementary_descriptor *sec = NULL;
598 struct iso_directory_record *rootp;
599 struct inode *inode;
600 struct iso9660_options opt;
601 struct isofs_sb_info *sbi;
602 unsigned long first_data_zone;
603 int joliet_level = 0;
604 int iso_blknum, block;
605 int orig_zonesize;
606 int table, error = -EINVAL;
607 unsigned int vol_desc_start;
608
609 save_mount_options(s, data);
610
611 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
612 if (!sbi)
613 return -ENOMEM;
614 s->s_fs_info = sbi;
615
616 if (!parse_options((char *)data, &opt))
617 goto out_freesbi;
618
619 /*
620 * First of all, get the hardware blocksize for this device.
621 * If we don't know what it is, or the hardware blocksize is
622 * larger than the blocksize the user specified, then use
623 * that value.
624 */
625 /*
626 * What if bugger tells us to go beyond page size?
627 */
628 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
629
630 sbi->s_high_sierra = 0; /* default is iso9660 */
631
632 vol_desc_start = (opt.sbsector != -1) ?
633 opt.sbsector : isofs_get_last_session(s,opt.session);
634
635 for (iso_blknum = vol_desc_start+16;
636 iso_blknum < vol_desc_start+100; iso_blknum++) {
637 struct hs_volume_descriptor *hdp;
638 struct iso_volume_descriptor *vdp;
639
640 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
641 if (!(bh = sb_bread(s, block)))
642 goto out_no_read;
643
644 vdp = (struct iso_volume_descriptor *)bh->b_data;
645 hdp = (struct hs_volume_descriptor *)bh->b_data;
646
647 /*
648 * Due to the overlapping physical location of the descriptors,
649 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
650 * proper identification in this case, we first check for ISO.
651 */
652 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
653 if (isonum_711(vdp->type) == ISO_VD_END)
654 break;
655 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
656 if (pri == NULL) {
657 pri = (struct iso_primary_descriptor *)vdp;
658 /* Save the buffer in case we need it ... */
659 pri_bh = bh;
660 bh = NULL;
661 }
662 }
663 #ifdef CONFIG_JOLIET
664 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
665 sec = (struct iso_supplementary_descriptor *)vdp;
666 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
667 if (opt.joliet) {
668 if (sec->escape[2] == 0x40)
669 joliet_level = 1;
670 else if (sec->escape[2] == 0x43)
671 joliet_level = 2;
672 else if (sec->escape[2] == 0x45)
673 joliet_level = 3;
674
675 printk(KERN_DEBUG "ISO 9660 Extensions: "
676 "Microsoft Joliet Level %d\n",
677 joliet_level);
678 }
679 goto root_found;
680 } else {
681 /* Unknown supplementary volume descriptor */
682 sec = NULL;
683 }
684 }
685 #endif
686 } else {
687 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
688 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
689 goto out_freebh;
690
691 sbi->s_high_sierra = 1;
692 opt.rock = 0;
693 h_pri = (struct hs_primary_descriptor *)vdp;
694 goto root_found;
695 }
696 }
697
698 /* Just skip any volume descriptors we don't recognize */
699
700 brelse(bh);
701 bh = NULL;
702 }
703 /*
704 * If we fall through, either no volume descriptor was found,
705 * or else we passed a primary descriptor looking for others.
706 */
707 if (!pri)
708 goto out_unknown_format;
709 brelse(bh);
710 bh = pri_bh;
711 pri_bh = NULL;
712
713 root_found:
714
715 if (joliet_level && (pri == NULL || !opt.rock)) {
716 /* This is the case of Joliet with the norock mount flag.
717 * A disc with both Joliet and Rock Ridge is handled later
718 */
719 pri = (struct iso_primary_descriptor *) sec;
720 }
721
722 if(sbi->s_high_sierra){
723 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
724 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
725 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
726 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
727 } else {
728 if (!pri)
729 goto out_freebh;
730 rootp = (struct iso_directory_record *) pri->root_directory_record;
731 sbi->s_nzones = isonum_733(pri->volume_space_size);
732 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
733 sbi->s_max_size = isonum_733(pri->volume_space_size);
734 }
735
736 sbi->s_ninodes = 0; /* No way to figure this out easily */
737
738 orig_zonesize = sbi->s_log_zone_size;
739 /*
740 * If the zone size is smaller than the hardware sector size,
741 * this is a fatal error. This would occur if the disc drive
742 * had sectors that were 2048 bytes, but the filesystem had
743 * blocks that were 512 bytes (which should only very rarely
744 * happen.)
745 */
746 if (orig_zonesize < opt.blocksize)
747 goto out_bad_size;
748
749 /* RDE: convert log zone size to bit shift */
750 switch (sbi->s_log_zone_size) {
751 case 512: sbi->s_log_zone_size = 9; break;
752 case 1024: sbi->s_log_zone_size = 10; break;
753 case 2048: sbi->s_log_zone_size = 11; break;
754
755 default:
756 goto out_bad_zone_size;
757 }
758
759 s->s_magic = ISOFS_SUPER_MAGIC;
760
761 /*
762 * With multi-extent files, file size is only limited by the maximum
763 * size of a file system, which is 8 TB.
764 */
765 s->s_maxbytes = 0x80000000000LL;
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(rootp->extent) +
771 isonum_711(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(rootp->extent) +
794 isonum_711(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(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(s, orig_zonesize);
822
823 sbi->s_nls_iocharset = NULL;
824
825 #ifdef CONFIG_JOLIET
826 if (joliet_level && opt.utf8 == 0) {
827 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
828 sbi->s_nls_iocharset = load_nls(p);
829 if (! sbi->s_nls_iocharset) {
830 /* Fail only if explicit charset specified */
831 if (opt.iocharset)
832 goto out_freesbi;
833 sbi->s_nls_iocharset = load_nls_default();
834 }
835 }
836 #endif
837 s->s_op = &isofs_sops;
838 s->s_export_op = &isofs_export_ops;
839 sbi->s_mapping = opt.map;
840 sbi->s_rock = (opt.rock ? 2 : 0);
841 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
842 sbi->s_cruft = opt.cruft;
843 sbi->s_hide = opt.hide;
844 sbi->s_showassoc = opt.showassoc;
845 sbi->s_uid = opt.uid;
846 sbi->s_gid = opt.gid;
847 sbi->s_uid_set = opt.uid_set;
848 sbi->s_gid_set = opt.gid_set;
849 sbi->s_utf8 = opt.utf8;
850 sbi->s_nocompress = opt.nocompress;
851 sbi->s_overriderockperm = opt.overriderockperm;
852 /*
853 * It would be incredibly stupid to allow people to mark every file
854 * on the disk as suid, so we merely allow them to set the default
855 * permissions.
856 */
857 if (opt.fmode != ISOFS_INVALID_MODE)
858 sbi->s_fmode = opt.fmode & 0777;
859 else
860 sbi->s_fmode = ISOFS_INVALID_MODE;
861 if (opt.dmode != ISOFS_INVALID_MODE)
862 sbi->s_dmode = opt.dmode & 0777;
863 else
864 sbi->s_dmode = ISOFS_INVALID_MODE;
865
866 /*
867 * Read the root inode, which _may_ result in changing
868 * the s_rock flag. Once we have the final s_rock value,
869 * we then decide whether to use the Joliet descriptor.
870 */
871 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
872 if (IS_ERR(inode))
873 goto out_no_root;
874
875 /*
876 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
877 * correct Joliet root directory.
878 */
879 if (sbi->s_rock == 1 && joliet_level &&
880 rootdir_empty(s, sbi->s_firstdatazone)) {
881 printk(KERN_NOTICE
882 "ISOFS: primary root directory is empty. "
883 "Disabling Rock Ridge and switching to Joliet.");
884 sbi->s_rock = 0;
885 }
886
887 /*
888 * If this disk has both Rock Ridge and Joliet on it, then we
889 * want to use Rock Ridge by default. This can be overridden
890 * by using the norock mount option. There is still one other
891 * possibility that is not taken into account: a Rock Ridge
892 * CD with Unicode names. Until someone sees such a beast, it
893 * will not be supported.
894 */
895 if (sbi->s_rock == 1) {
896 joliet_level = 0;
897 } else if (joliet_level) {
898 sbi->s_rock = 0;
899 if (sbi->s_firstdatazone != first_data_zone) {
900 sbi->s_firstdatazone = first_data_zone;
901 printk(KERN_DEBUG
902 "ISOFS: changing to secondary root\n");
903 iput(inode);
904 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
905 if (IS_ERR(inode))
906 goto out_no_root;
907 }
908 }
909
910 if (opt.check == 'u') {
911 /* Only Joliet is case insensitive by default */
912 if (joliet_level)
913 opt.check = 'r';
914 else
915 opt.check = 's';
916 }
917 sbi->s_joliet_level = joliet_level;
918
919 /* Make sure the root inode is a directory */
920 if (!S_ISDIR(inode->i_mode)) {
921 printk(KERN_WARNING
922 "isofs_fill_super: root inode is not a directory. "
923 "Corrupted media?\n");
924 goto out_iput;
925 }
926
927 table = 0;
928 if (joliet_level)
929 table += 2;
930 if (opt.check == 'r')
931 table++;
932
933 s->s_d_op = &isofs_dentry_ops[table];
934
935 /* get the root dentry */
936 s->s_root = d_make_root(inode);
937 if (!(s->s_root)) {
938 error = -ENOMEM;
939 goto out_no_inode;
940 }
941
942 kfree(opt.iocharset);
943
944 return 0;
945
946 /*
947 * Display error messages and free resources.
948 */
949 out_iput:
950 iput(inode);
951 goto out_no_inode;
952 out_no_root:
953 error = PTR_ERR(inode);
954 if (error != -ENOMEM)
955 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
956 out_no_inode:
957 #ifdef CONFIG_JOLIET
958 unload_nls(sbi->s_nls_iocharset);
959 #endif
960 goto out_freesbi;
961 out_no_read:
962 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
963 __func__, s->s_id, iso_blknum, block);
964 goto out_freebh;
965 out_bad_zone_size:
966 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
967 sbi->s_log_zone_size);
968 goto out_freebh;
969 out_bad_size:
970 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
971 orig_zonesize, opt.blocksize);
972 goto out_freebh;
973 out_unknown_format:
974 if (!silent)
975 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
976
977 out_freebh:
978 brelse(bh);
979 brelse(pri_bh);
980 out_freesbi:
981 kfree(opt.iocharset);
982 kfree(sbi);
983 s->s_fs_info = NULL;
984 return error;
985 }
986
987 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
988 {
989 struct super_block *sb = dentry->d_sb;
990 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
991
992 buf->f_type = ISOFS_SUPER_MAGIC;
993 buf->f_bsize = sb->s_blocksize;
994 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
995 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
996 buf->f_bfree = 0;
997 buf->f_bavail = 0;
998 buf->f_files = ISOFS_SB(sb)->s_ninodes;
999 buf->f_ffree = 0;
1000 buf->f_fsid.val[0] = (u32)id;
1001 buf->f_fsid.val[1] = (u32)(id >> 32);
1002 buf->f_namelen = NAME_MAX;
1003 return 0;
1004 }
1005
1006 /*
1007 * Get a set of blocks; filling in buffer_heads if already allocated
1008 * or getblk() if they are not. Returns the number of blocks inserted
1009 * (-ve == error.)
1010 */
1011 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1012 struct buffer_head **bh, unsigned long nblocks)
1013 {
1014 unsigned long b_off = iblock;
1015 unsigned offset, sect_size;
1016 unsigned int firstext;
1017 unsigned long nextblk, nextoff;
1018 int section, rv, error;
1019 struct iso_inode_info *ei = ISOFS_I(inode);
1020
1021 error = -EIO;
1022 rv = 0;
1023 if (iblock != b_off) {
1024 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1025 goto abort;
1026 }
1027
1028
1029 offset = 0;
1030 firstext = ei->i_first_extent;
1031 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1032 nextblk = ei->i_next_section_block;
1033 nextoff = ei->i_next_section_offset;
1034 section = 0;
1035
1036 while (nblocks) {
1037 /* If we are *way* beyond the end of the file, print a message.
1038 * Access beyond the end of the file up to the next page boundary
1039 * is normal, however because of the way the page cache works.
1040 * In this case, we just return 0 so that we can properly fill
1041 * the page with useless information without generating any
1042 * I/O errors.
1043 */
1044 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1045 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1046 __func__, b_off,
1047 (unsigned long long)inode->i_size);
1048 goto abort;
1049 }
1050
1051 /* On the last section, nextblk == 0, section size is likely to
1052 * exceed sect_size by a partial block, and access beyond the
1053 * end of the file will reach beyond the section size, too.
1054 */
1055 while (nextblk && (b_off >= (offset + sect_size))) {
1056 struct inode *ninode;
1057
1058 offset += sect_size;
1059 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1060 if (IS_ERR(ninode)) {
1061 error = PTR_ERR(ninode);
1062 goto abort;
1063 }
1064 firstext = ISOFS_I(ninode)->i_first_extent;
1065 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1066 nextblk = ISOFS_I(ninode)->i_next_section_block;
1067 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1068 iput(ninode);
1069
1070 if (++section > 100) {
1071 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1072 " aborting...\n", __func__);
1073 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1074 "nextblk=%lu nextoff=%lu\n", __func__,
1075 b_off, firstext, (unsigned) sect_size,
1076 nextblk, nextoff);
1077 goto abort;
1078 }
1079 }
1080
1081 if (*bh) {
1082 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1083 } else {
1084 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1085 if (!*bh)
1086 goto abort;
1087 }
1088 bh++; /* Next buffer head */
1089 b_off++; /* Next buffer offset */
1090 nblocks--;
1091 rv++;
1092 }
1093
1094 error = 0;
1095 abort:
1096 return rv != 0 ? rv : error;
1097 }
1098
1099 /*
1100 * Used by the standard interfaces.
1101 */
1102 static int isofs_get_block(struct inode *inode, sector_t iblock,
1103 struct buffer_head *bh_result, int create)
1104 {
1105 int ret;
1106
1107 if (create) {
1108 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1109 return -EROFS;
1110 }
1111
1112 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1113 return ret < 0 ? ret : 0;
1114 }
1115
1116 static int isofs_bmap(struct inode *inode, sector_t block)
1117 {
1118 struct buffer_head dummy;
1119 int error;
1120
1121 dummy.b_state = 0;
1122 dummy.b_blocknr = -1000;
1123 error = isofs_get_block(inode, block, &dummy, 0);
1124 if (!error)
1125 return dummy.b_blocknr;
1126 return 0;
1127 }
1128
1129 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1130 {
1131 sector_t blknr = isofs_bmap(inode, block);
1132 if (!blknr)
1133 return NULL;
1134 return sb_bread(inode->i_sb, blknr);
1135 }
1136
1137 static int isofs_readpage(struct file *file, struct page *page)
1138 {
1139 return mpage_readpage(page, isofs_get_block);
1140 }
1141
1142 static int isofs_readpages(struct file *file, struct address_space *mapping,
1143 struct list_head *pages, unsigned nr_pages)
1144 {
1145 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1146 }
1147
1148 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1149 {
1150 return generic_block_bmap(mapping,block,isofs_get_block);
1151 }
1152
1153 static const struct address_space_operations isofs_aops = {
1154 .readpage = isofs_readpage,
1155 .readpages = isofs_readpages,
1156 .bmap = _isofs_bmap
1157 };
1158
1159 static int isofs_read_level3_size(struct inode *inode)
1160 {
1161 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1162 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1163 struct buffer_head *bh = NULL;
1164 unsigned long block, offset, block_saved, offset_saved;
1165 int i = 0;
1166 int more_entries = 0;
1167 struct iso_directory_record *tmpde = NULL;
1168 struct iso_inode_info *ei = ISOFS_I(inode);
1169
1170 inode->i_size = 0;
1171
1172 /* The first 16 blocks are reserved as the System Area. Thus,
1173 * no inodes can appear in block 0. We use this to flag that
1174 * this is the last section. */
1175 ei->i_next_section_block = 0;
1176 ei->i_next_section_offset = 0;
1177
1178 block = ei->i_iget5_block;
1179 offset = ei->i_iget5_offset;
1180
1181 do {
1182 struct iso_directory_record *de;
1183 unsigned int de_len;
1184
1185 if (!bh) {
1186 bh = sb_bread(inode->i_sb, block);
1187 if (!bh)
1188 goto out_noread;
1189 }
1190 de = (struct iso_directory_record *) (bh->b_data + offset);
1191 de_len = *(unsigned char *) de;
1192
1193 if (de_len == 0) {
1194 brelse(bh);
1195 bh = NULL;
1196 ++block;
1197 offset = 0;
1198 continue;
1199 }
1200
1201 block_saved = block;
1202 offset_saved = offset;
1203 offset += de_len;
1204
1205 /* Make sure we have a full directory entry */
1206 if (offset >= bufsize) {
1207 int slop = bufsize - offset + de_len;
1208 if (!tmpde) {
1209 tmpde = kmalloc(256, GFP_KERNEL);
1210 if (!tmpde)
1211 goto out_nomem;
1212 }
1213 memcpy(tmpde, de, slop);
1214 offset &= bufsize - 1;
1215 block++;
1216 brelse(bh);
1217 bh = NULL;
1218 if (offset) {
1219 bh = sb_bread(inode->i_sb, block);
1220 if (!bh)
1221 goto out_noread;
1222 memcpy((void *)tmpde+slop, bh->b_data, offset);
1223 }
1224 de = tmpde;
1225 }
1226
1227 inode->i_size += isonum_733(de->size);
1228 if (i == 1) {
1229 ei->i_next_section_block = block_saved;
1230 ei->i_next_section_offset = offset_saved;
1231 }
1232
1233 more_entries = de->flags[-high_sierra] & 0x80;
1234
1235 i++;
1236 if (i > 100)
1237 goto out_toomany;
1238 } while (more_entries);
1239 out:
1240 kfree(tmpde);
1241 if (bh)
1242 brelse(bh);
1243 return 0;
1244
1245 out_nomem:
1246 if (bh)
1247 brelse(bh);
1248 return -ENOMEM;
1249
1250 out_noread:
1251 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1252 kfree(tmpde);
1253 return -EIO;
1254
1255 out_toomany:
1256 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1257 "isofs_read_level3_size: inode=%lu\n",
1258 __func__, inode->i_ino);
1259 goto out;
1260 }
1261
1262 static int isofs_read_inode(struct inode *inode)
1263 {
1264 struct super_block *sb = inode->i_sb;
1265 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1266 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1267 unsigned long block;
1268 int high_sierra = sbi->s_high_sierra;
1269 struct buffer_head *bh = NULL;
1270 struct iso_directory_record *de;
1271 struct iso_directory_record *tmpde = NULL;
1272 unsigned int de_len;
1273 unsigned long offset;
1274 struct iso_inode_info *ei = ISOFS_I(inode);
1275 int ret = -EIO;
1276
1277 block = ei->i_iget5_block;
1278 bh = sb_bread(inode->i_sb, block);
1279 if (!bh)
1280 goto out_badread;
1281
1282 offset = ei->i_iget5_offset;
1283
1284 de = (struct iso_directory_record *) (bh->b_data + offset);
1285 de_len = *(unsigned char *) de;
1286
1287 if (offset + de_len > bufsize) {
1288 int frag1 = bufsize - offset;
1289
1290 tmpde = kmalloc(de_len, GFP_KERNEL);
1291 if (tmpde == NULL) {
1292 printk(KERN_INFO "%s: out of memory\n", __func__);
1293 ret = -ENOMEM;
1294 goto fail;
1295 }
1296 memcpy(tmpde, bh->b_data + offset, frag1);
1297 brelse(bh);
1298 bh = sb_bread(inode->i_sb, ++block);
1299 if (!bh)
1300 goto out_badread;
1301 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1302 de = tmpde;
1303 }
1304
1305 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1306 ei->i_iget5_offset,
1307 ISOFS_BUFFER_BITS(inode));
1308
1309 /* Assume it is a normal-format file unless told otherwise */
1310 ei->i_file_format = isofs_file_normal;
1311
1312 if (de->flags[-high_sierra] & 2) {
1313 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1314 inode->i_mode = S_IFDIR | sbi->s_dmode;
1315 else
1316 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1317 set_nlink(inode, 1); /*
1318 * Set to 1. We know there are 2, but
1319 * the find utility tries to optimize
1320 * if it is 2, and it screws up. It is
1321 * easier to give 1 which tells find to
1322 * do it the hard way.
1323 */
1324 } else {
1325 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1326 inode->i_mode = S_IFREG | sbi->s_fmode;
1327 } else {
1328 /*
1329 * Set default permissions: r-x for all. The disc
1330 * could be shared with DOS machines so virtually
1331 * anything could be a valid executable.
1332 */
1333 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1334 }
1335 set_nlink(inode, 1);
1336 }
1337 inode->i_uid = sbi->s_uid;
1338 inode->i_gid = sbi->s_gid;
1339 inode->i_blocks = 0;
1340
1341 ei->i_format_parm[0] = 0;
1342 ei->i_format_parm[1] = 0;
1343 ei->i_format_parm[2] = 0;
1344
1345 ei->i_section_size = isonum_733(de->size);
1346 if (de->flags[-high_sierra] & 0x80) {
1347 ret = isofs_read_level3_size(inode);
1348 if (ret < 0)
1349 goto fail;
1350 ret = -EIO;
1351 } else {
1352 ei->i_next_section_block = 0;
1353 ei->i_next_section_offset = 0;
1354 inode->i_size = isonum_733(de->size);
1355 }
1356
1357 /*
1358 * Some dipshit decided to store some other bit of information
1359 * in the high byte of the file length. Truncate size in case
1360 * this CDROM was mounted with the cruft option.
1361 */
1362
1363 if (sbi->s_cruft)
1364 inode->i_size &= 0x00ffffff;
1365
1366 if (de->interleave[0]) {
1367 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1368 inode->i_size = 0;
1369 }
1370
1371 /* I have no idea what file_unit_size is used for, so
1372 we will flag it for now */
1373 if (de->file_unit_size[0] != 0) {
1374 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1375 inode->i_ino);
1376 }
1377
1378 /* I have no idea what other flag bits are used for, so
1379 we will flag it for now */
1380 #ifdef DEBUG
1381 if((de->flags[-high_sierra] & ~2)!= 0){
1382 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1383 "(%ld %x).\n",
1384 inode->i_ino, de->flags[-high_sierra]);
1385 }
1386 #endif
1387
1388 inode->i_mtime.tv_sec =
1389 inode->i_atime.tv_sec =
1390 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1391 inode->i_mtime.tv_nsec =
1392 inode->i_atime.tv_nsec =
1393 inode->i_ctime.tv_nsec = 0;
1394
1395 ei->i_first_extent = (isonum_733(de->extent) +
1396 isonum_711(de->ext_attr_length));
1397
1398 /* Set the number of blocks for stat() - should be done before RR */
1399 inode->i_blocks = (inode->i_size + 511) >> 9;
1400
1401 /*
1402 * Now test for possible Rock Ridge extensions which will override
1403 * some of these numbers in the inode structure.
1404 */
1405
1406 if (!high_sierra) {
1407 parse_rock_ridge_inode(de, inode);
1408 /* if we want uid/gid set, override the rock ridge setting */
1409 if (sbi->s_uid_set)
1410 inode->i_uid = sbi->s_uid;
1411 if (sbi->s_gid_set)
1412 inode->i_gid = sbi->s_gid;
1413 }
1414 /* Now set final access rights if overriding rock ridge setting */
1415 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1416 sbi->s_dmode != ISOFS_INVALID_MODE)
1417 inode->i_mode = S_IFDIR | sbi->s_dmode;
1418 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1419 sbi->s_fmode != ISOFS_INVALID_MODE)
1420 inode->i_mode = S_IFREG | sbi->s_fmode;
1421
1422 /* Install the inode operations vector */
1423 if (S_ISREG(inode->i_mode)) {
1424 inode->i_fop = &generic_ro_fops;
1425 switch (ei->i_file_format) {
1426 #ifdef CONFIG_ZISOFS
1427 case isofs_file_compressed:
1428 inode->i_data.a_ops = &zisofs_aops;
1429 break;
1430 #endif
1431 default:
1432 inode->i_data.a_ops = &isofs_aops;
1433 break;
1434 }
1435 } else if (S_ISDIR(inode->i_mode)) {
1436 inode->i_op = &isofs_dir_inode_operations;
1437 inode->i_fop = &isofs_dir_operations;
1438 } else if (S_ISLNK(inode->i_mode)) {
1439 inode->i_op = &page_symlink_inode_operations;
1440 inode->i_data.a_ops = &isofs_symlink_aops;
1441 } else
1442 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1443 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1444
1445 ret = 0;
1446 out:
1447 kfree(tmpde);
1448 if (bh)
1449 brelse(bh);
1450 return ret;
1451
1452 out_badread:
1453 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1454 fail:
1455 goto out;
1456 }
1457
1458 struct isofs_iget5_callback_data {
1459 unsigned long block;
1460 unsigned long offset;
1461 };
1462
1463 static int isofs_iget5_test(struct inode *ino, void *data)
1464 {
1465 struct iso_inode_info *i = ISOFS_I(ino);
1466 struct isofs_iget5_callback_data *d =
1467 (struct isofs_iget5_callback_data*)data;
1468 return (i->i_iget5_block == d->block)
1469 && (i->i_iget5_offset == d->offset);
1470 }
1471
1472 static int isofs_iget5_set(struct inode *ino, void *data)
1473 {
1474 struct iso_inode_info *i = ISOFS_I(ino);
1475 struct isofs_iget5_callback_data *d =
1476 (struct isofs_iget5_callback_data*)data;
1477 i->i_iget5_block = d->block;
1478 i->i_iget5_offset = d->offset;
1479 return 0;
1480 }
1481
1482 /* Store, in the inode's containing structure, the block and block
1483 * offset that point to the underlying meta-data for the inode. The
1484 * code below is otherwise similar to the iget() code in
1485 * include/linux/fs.h */
1486 struct inode *isofs_iget(struct super_block *sb,
1487 unsigned long block,
1488 unsigned long offset)
1489 {
1490 unsigned long hashval;
1491 struct inode *inode;
1492 struct isofs_iget5_callback_data data;
1493 long ret;
1494
1495 if (offset >= 1ul << sb->s_blocksize_bits)
1496 return ERR_PTR(-EINVAL);
1497
1498 data.block = block;
1499 data.offset = offset;
1500
1501 hashval = (block << sb->s_blocksize_bits) | offset;
1502
1503 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1504 &isofs_iget5_set, &data);
1505
1506 if (!inode)
1507 return ERR_PTR(-ENOMEM);
1508
1509 if (inode->i_state & I_NEW) {
1510 ret = isofs_read_inode(inode);
1511 if (ret < 0) {
1512 iget_failed(inode);
1513 inode = ERR_PTR(ret);
1514 } else {
1515 unlock_new_inode(inode);
1516 }
1517 }
1518
1519 return inode;
1520 }
1521
1522 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1523 int flags, const char *dev_name, void *data)
1524 {
1525 /* We don't support read-write mounts */
1526 if (!(flags & MS_RDONLY))
1527 return ERR_PTR(-EACCES);
1528 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1529 }
1530
1531 static struct file_system_type iso9660_fs_type = {
1532 .owner = THIS_MODULE,
1533 .name = "iso9660",
1534 .mount = isofs_mount,
1535 .kill_sb = kill_block_super,
1536 .fs_flags = FS_REQUIRES_DEV,
1537 };
1538 MODULE_ALIAS_FS("iso9660");
1539 MODULE_ALIAS("iso9660");
1540
1541 static int __init init_iso9660_fs(void)
1542 {
1543 int err = init_inodecache();
1544 if (err)
1545 goto out;
1546 #ifdef CONFIG_ZISOFS
1547 err = zisofs_init();
1548 if (err)
1549 goto out1;
1550 #endif
1551 err = register_filesystem(&iso9660_fs_type);
1552 if (err)
1553 goto out2;
1554 return 0;
1555 out2:
1556 #ifdef CONFIG_ZISOFS
1557 zisofs_cleanup();
1558 out1:
1559 #endif
1560 destroy_inodecache();
1561 out:
1562 return err;
1563 }
1564
1565 static void __exit exit_iso9660_fs(void)
1566 {
1567 unregister_filesystem(&iso9660_fs_type);
1568 #ifdef CONFIG_ZISOFS
1569 zisofs_cleanup();
1570 #endif
1571 destroy_inodecache();
1572 }
1573
1574 module_init(init_iso9660_fs)
1575 module_exit(exit_iso9660_fs)
1576 MODULE_LICENSE("GPL");
Linux with added FPC-III support