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