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