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[mirror_ubuntu-artful-kernel.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 #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 struct kmem_cache *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, GFP_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(struct kmem_cache *cachep, void *foo)
77 {
78 struct iso_inode_info *ei = foo;
79
80 inode_init_once(&ei->vfs_inode);
81 }
82
83 static int init_inodecache(void)
84 {
85 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
86 sizeof(struct iso_inode_info),
87 0, (SLAB_RECLAIM_ACCOUNT|
88 SLAB_MEM_SPREAD),
89 init_once);
90 if (isofs_inode_cachep == NULL)
91 return -ENOMEM;
92 return 0;
93 }
94
95 static void destroy_inodecache(void)
96 {
97 kmem_cache_destroy(isofs_inode_cachep);
98 }
99
100 static int isofs_remount(struct super_block *sb, int *flags, char *data)
101 {
102 /* we probably want a lot more here */
103 *flags |= MS_RDONLY;
104 return 0;
105 }
106
107 static const struct super_operations isofs_sops = {
108 .alloc_inode = isofs_alloc_inode,
109 .destroy_inode = isofs_destroy_inode,
110 .read_inode = isofs_read_inode,
111 .put_super = isofs_put_super,
112 .statfs = isofs_statfs,
113 .remount_fs = isofs_remount,
114 };
115
116
117 static struct dentry_operations isofs_dentry_ops[] = {
118 {
119 .d_hash = isofs_hash,
120 .d_compare = isofs_dentry_cmp,
121 },
122 {
123 .d_hash = isofs_hashi,
124 .d_compare = isofs_dentry_cmpi,
125 },
126 #ifdef CONFIG_JOLIET
127 {
128 .d_hash = isofs_hash_ms,
129 .d_compare = isofs_dentry_cmp_ms,
130 },
131 {
132 .d_hash = isofs_hashi_ms,
133 .d_compare = isofs_dentry_cmpi_ms,
134 },
135 #endif
136 };
137
138 struct iso9660_options{
139 char map;
140 char rock;
141 char joliet;
142 char cruft;
143 char hide;
144 char showassoc;
145 char nocompress;
146 unsigned char check;
147 unsigned int blocksize;
148 mode_t mode;
149 gid_t gid;
150 uid_t uid;
151 char *iocharset;
152 unsigned char utf8;
153 /* LVE */
154 s32 session;
155 s32 sbsector;
156 };
157
158 /*
159 * Compute the hash for the isofs name corresponding to the dentry.
160 */
161 static int
162 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
163 {
164 const char *name;
165 int len;
166
167 len = qstr->len;
168 name = qstr->name;
169 if (ms) {
170 while (len && name[len-1] == '.')
171 len--;
172 }
173
174 qstr->hash = full_name_hash(name, len);
175
176 return 0;
177 }
178
179 /*
180 * Compute the hash for the isofs name corresponding to the dentry.
181 */
182 static int
183 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
184 {
185 const char *name;
186 int len;
187 char c;
188 unsigned long hash;
189
190 len = qstr->len;
191 name = qstr->name;
192 if (ms) {
193 while (len && name[len-1] == '.')
194 len--;
195 }
196
197 hash = init_name_hash();
198 while (len--) {
199 c = tolower(*name++);
200 hash = partial_name_hash(c, hash);
201 }
202 qstr->hash = end_name_hash(hash);
203
204 return 0;
205 }
206
207 /*
208 * Case insensitive compare of two isofs names.
209 */
210 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
211 struct qstr *b, int ms)
212 {
213 int alen, blen;
214
215 /* A filename cannot end in '.' or we treat it like it has none */
216 alen = a->len;
217 blen = b->len;
218 if (ms) {
219 while (alen && a->name[alen-1] == '.')
220 alen--;
221 while (blen && b->name[blen-1] == '.')
222 blen--;
223 }
224 if (alen == blen) {
225 if (strnicmp(a->name, b->name, alen) == 0)
226 return 0;
227 }
228 return 1;
229 }
230
231 /*
232 * Case sensitive compare of two isofs names.
233 */
234 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
235 struct qstr *b, int ms)
236 {
237 int alen, blen;
238
239 /* A filename cannot end in '.' or we treat it like it has none */
240 alen = a->len;
241 blen = b->len;
242 if (ms) {
243 while (alen && a->name[alen-1] == '.')
244 alen--;
245 while (blen && b->name[blen-1] == '.')
246 blen--;
247 }
248 if (alen == blen) {
249 if (strncmp(a->name, b->name, alen) == 0)
250 return 0;
251 }
252 return 1;
253 }
254
255 static int
256 isofs_hash(struct dentry *dentry, struct qstr *qstr)
257 {
258 return isofs_hash_common(dentry, qstr, 0);
259 }
260
261 static int
262 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
263 {
264 return isofs_hashi_common(dentry, qstr, 0);
265 }
266
267 static int
268 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
269 {
270 return isofs_dentry_cmp_common(dentry, a, b, 0);
271 }
272
273 static int
274 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
275 {
276 return isofs_dentry_cmpi_common(dentry, a, b, 0);
277 }
278
279 #ifdef CONFIG_JOLIET
280 static int
281 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
282 {
283 return isofs_hash_common(dentry, qstr, 1);
284 }
285
286 static int
287 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
288 {
289 return isofs_hashi_common(dentry, qstr, 1);
290 }
291
292 static int
293 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
294 {
295 return isofs_dentry_cmp_common(dentry, a, b, 1);
296 }
297
298 static int
299 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
300 {
301 return isofs_dentry_cmpi_common(dentry, a, b, 1);
302 }
303 #endif
304
305 enum {
306 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
307 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
308 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
309 Opt_nocompress, Opt_hide, Opt_showassoc,
310 };
311
312 static match_table_t tokens = {
313 {Opt_norock, "norock"},
314 {Opt_nojoliet, "nojoliet"},
315 {Opt_unhide, "unhide"},
316 {Opt_hide, "hide"},
317 {Opt_showassoc, "showassoc"},
318 {Opt_cruft, "cruft"},
319 {Opt_utf8, "utf8"},
320 {Opt_iocharset, "iocharset=%s"},
321 {Opt_map_a, "map=acorn"},
322 {Opt_map_a, "map=a"},
323 {Opt_map_n, "map=normal"},
324 {Opt_map_n, "map=n"},
325 {Opt_map_o, "map=off"},
326 {Opt_map_o, "map=o"},
327 {Opt_session, "session=%u"},
328 {Opt_sb, "sbsector=%u"},
329 {Opt_check_r, "check=relaxed"},
330 {Opt_check_r, "check=r"},
331 {Opt_check_s, "check=strict"},
332 {Opt_check_s, "check=s"},
333 {Opt_uid, "uid=%u"},
334 {Opt_gid, "gid=%u"},
335 {Opt_mode, "mode=%u"},
336 {Opt_block, "block=%u"},
337 {Opt_ignore, "conv=binary"},
338 {Opt_ignore, "conv=b"},
339 {Opt_ignore, "conv=text"},
340 {Opt_ignore, "conv=t"},
341 {Opt_ignore, "conv=mtext"},
342 {Opt_ignore, "conv=m"},
343 {Opt_ignore, "conv=auto"},
344 {Opt_ignore, "conv=a"},
345 {Opt_nocompress, "nocompress"},
346 {Opt_err, NULL}
347 };
348
349 static int parse_options(char *options, struct iso9660_options *popt)
350 {
351 char *p;
352 int option;
353
354 popt->map = 'n';
355 popt->rock = 'y';
356 popt->joliet = 'y';
357 popt->cruft = 'n';
358 popt->hide = 'n';
359 popt->showassoc = 'n';
360 popt->check = 'u'; /* unset */
361 popt->nocompress = 0;
362 popt->blocksize = 1024;
363 popt->mode = S_IRUGO | S_IXUGO; /*
364 * r-x for all. The disc could
365 * be shared with DOS machines so
366 * virtually anything could be
367 * a valid executable.
368 */
369 popt->gid = 0;
370 popt->uid = 0;
371 popt->iocharset = NULL;
372 popt->utf8 = 0;
373 popt->session=-1;
374 popt->sbsector=-1;
375 if (!options)
376 return 1;
377
378 while ((p = strsep(&options, ",")) != NULL) {
379 int token;
380 substring_t args[MAX_OPT_ARGS];
381 unsigned n;
382
383 if (!*p)
384 continue;
385
386 token = match_token(p, tokens, args);
387 switch (token) {
388 case Opt_norock:
389 popt->rock = 'n';
390 break;
391 case Opt_nojoliet:
392 popt->joliet = 'n';
393 break;
394 case Opt_hide:
395 popt->hide = 'y';
396 break;
397 case Opt_unhide:
398 case Opt_showassoc:
399 popt->showassoc = 'y';
400 break;
401 case Opt_cruft:
402 popt->cruft = 'y';
403 break;
404 case Opt_utf8:
405 popt->utf8 = 1;
406 break;
407 #ifdef CONFIG_JOLIET
408 case Opt_iocharset:
409 popt->iocharset = match_strdup(&args[0]);
410 break;
411 #endif
412 case Opt_map_a:
413 popt->map = 'a';
414 break;
415 case Opt_map_o:
416 popt->map = 'o';
417 break;
418 case Opt_map_n:
419 popt->map = 'n';
420 break;
421 case Opt_session:
422 if (match_int(&args[0], &option))
423 return 0;
424 n = option;
425 if (n > 99)
426 return 0;
427 popt->session = n + 1;
428 break;
429 case Opt_sb:
430 if (match_int(&args[0], &option))
431 return 0;
432 popt->sbsector = option;
433 break;
434 case Opt_check_r:
435 popt->check = 'r';
436 break;
437 case Opt_check_s:
438 popt->check = 's';
439 break;
440 case Opt_ignore:
441 break;
442 case Opt_uid:
443 if (match_int(&args[0], &option))
444 return 0;
445 popt->uid = option;
446 break;
447 case Opt_gid:
448 if (match_int(&args[0], &option))
449 return 0;
450 popt->gid = option;
451 break;
452 case Opt_mode:
453 if (match_int(&args[0], &option))
454 return 0;
455 popt->mode = option;
456 break;
457 case Opt_block:
458 if (match_int(&args[0], &option))
459 return 0;
460 n = option;
461 if (n != 512 && n != 1024 && n != 2048)
462 return 0;
463 popt->blocksize = n;
464 break;
465 case Opt_nocompress:
466 popt->nocompress = 1;
467 break;
468 default:
469 return 0;
470 }
471 }
472 return 1;
473 }
474
475 /*
476 * look if the driver can tell the multi session redirection value
477 *
478 * don't change this if you don't know what you do, please!
479 * Multisession is legal only with XA disks.
480 * A non-XA disk with more than one volume descriptor may do it right, but
481 * usually is written in a nowhere standardized "multi-partition" manner.
482 * Multisession uses absolute addressing (solely the first frame of the whole
483 * track is #0), multi-partition uses relative addressing (each first frame of
484 * each track is #0), and a track is not a session.
485 *
486 * A broken CDwriter software or drive firmware does not set new standards,
487 * at least not if conflicting with the existing ones.
488 *
489 * emoenke@gwdg.de
490 */
491 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
492
493 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
494 {
495 struct cdrom_multisession ms_info;
496 unsigned int vol_desc_start;
497 struct block_device *bdev = sb->s_bdev;
498 int i;
499
500 vol_desc_start=0;
501 ms_info.addr_format=CDROM_LBA;
502 if(session >= 0 && session <= 99) {
503 struct cdrom_tocentry Te;
504 Te.cdte_track=session;
505 Te.cdte_format=CDROM_LBA;
506 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
507 if (!i) {
508 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
509 session, Te.cdte_addr.lba,
510 Te.cdte_ctrl&CDROM_DATA_TRACK);
511 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
512 return Te.cdte_addr.lba;
513 }
514
515 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
516 }
517 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
518 if (session > 0)
519 printk(KERN_ERR "ISOFS: Invalid session number\n");
520 #if 0
521 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
522 if (i==0) {
523 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
524 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
525 }
526 #endif
527 if (i==0)
528 #if WE_OBEY_THE_WRITTEN_STANDARDS
529 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
530 #endif
531 vol_desc_start=ms_info.addr.lba;
532 return vol_desc_start;
533 }
534
535 /*
536 * Initialize the superblock and read the root inode.
537 *
538 * Note: a check_disk_change() has been done immediately prior
539 * to this call, so we don't need to check again.
540 */
541 static int isofs_fill_super(struct super_block *s, void *data, int silent)
542 {
543 struct buffer_head *bh = NULL, *pri_bh = NULL;
544 struct hs_primary_descriptor *h_pri = NULL;
545 struct iso_primary_descriptor *pri = NULL;
546 struct iso_supplementary_descriptor *sec = NULL;
547 struct iso_directory_record *rootp;
548 struct inode *inode;
549 struct iso9660_options opt;
550 struct isofs_sb_info *sbi;
551 unsigned long first_data_zone;
552 int joliet_level = 0;
553 int iso_blknum, block;
554 int orig_zonesize;
555 int table;
556 unsigned int vol_desc_start;
557
558 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
559 if (!sbi)
560 return -ENOMEM;
561 s->s_fs_info = sbi;
562
563 if (!parse_options((char *)data, &opt))
564 goto out_freesbi;
565
566 /*
567 * First of all, get the hardware blocksize for this device.
568 * If we don't know what it is, or the hardware blocksize is
569 * larger than the blocksize the user specified, then use
570 * that value.
571 */
572 /*
573 * What if bugger tells us to go beyond page size?
574 */
575 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
576
577 sbi->s_high_sierra = 0; /* default is iso9660 */
578
579 vol_desc_start = (opt.sbsector != -1) ?
580 opt.sbsector : isofs_get_last_session(s,opt.session);
581
582 for (iso_blknum = vol_desc_start+16;
583 iso_blknum < vol_desc_start+100; iso_blknum++) {
584 struct hs_volume_descriptor *hdp;
585 struct iso_volume_descriptor *vdp;
586
587 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
588 if (!(bh = sb_bread(s, block)))
589 goto out_no_read;
590
591 vdp = (struct iso_volume_descriptor *)bh->b_data;
592 hdp = (struct hs_volume_descriptor *)bh->b_data;
593
594 /*
595 * Due to the overlapping physical location of the descriptors,
596 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
597 * proper identification in this case, we first check for ISO.
598 */
599 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
600 if (isonum_711(vdp->type) == ISO_VD_END)
601 break;
602 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
603 if (pri == NULL) {
604 pri = (struct iso_primary_descriptor *)vdp;
605 /* Save the buffer in case we need it ... */
606 pri_bh = bh;
607 bh = NULL;
608 }
609 }
610 #ifdef CONFIG_JOLIET
611 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
612 sec = (struct iso_supplementary_descriptor *)vdp;
613 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
614 if (opt.joliet == 'y') {
615 if (sec->escape[2] == 0x40)
616 joliet_level = 1;
617 else if (sec->escape[2] == 0x43)
618 joliet_level = 2;
619 else if (sec->escape[2] == 0x45)
620 joliet_level = 3;
621
622 printk(KERN_DEBUG "ISO 9660 Extensions: "
623 "Microsoft Joliet Level %d\n",
624 joliet_level);
625 }
626 goto root_found;
627 } else {
628 /* Unknown supplementary volume descriptor */
629 sec = NULL;
630 }
631 }
632 #endif
633 } else {
634 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
635 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
636 goto out_freebh;
637
638 sbi->s_high_sierra = 1;
639 opt.rock = 'n';
640 h_pri = (struct hs_primary_descriptor *)vdp;
641 goto root_found;
642 }
643 }
644
645 /* Just skip any volume descriptors we don't recognize */
646
647 brelse(bh);
648 bh = NULL;
649 }
650 /*
651 * If we fall through, either no volume descriptor was found,
652 * or else we passed a primary descriptor looking for others.
653 */
654 if (!pri)
655 goto out_unknown_format;
656 brelse(bh);
657 bh = pri_bh;
658 pri_bh = NULL;
659
660 root_found:
661
662 if (joliet_level && (pri == NULL || opt.rock == 'n')) {
663 /* This is the case of Joliet with the norock mount flag.
664 * A disc with both Joliet and Rock Ridge is handled later
665 */
666 pri = (struct iso_primary_descriptor *) sec;
667 }
668
669 if(sbi->s_high_sierra){
670 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
671 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
672 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
673 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
674 } else {
675 if (!pri)
676 goto out_freebh;
677 rootp = (struct iso_directory_record *) pri->root_directory_record;
678 sbi->s_nzones = isonum_733(pri->volume_space_size);
679 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
680 sbi->s_max_size = isonum_733(pri->volume_space_size);
681 }
682
683 sbi->s_ninodes = 0; /* No way to figure this out easily */
684
685 orig_zonesize = sbi->s_log_zone_size;
686 /*
687 * If the zone size is smaller than the hardware sector size,
688 * this is a fatal error. This would occur if the disc drive
689 * had sectors that were 2048 bytes, but the filesystem had
690 * blocks that were 512 bytes (which should only very rarely
691 * happen.)
692 */
693 if (orig_zonesize < opt.blocksize)
694 goto out_bad_size;
695
696 /* RDE: convert log zone size to bit shift */
697 switch (sbi->s_log_zone_size) {
698 case 512: sbi->s_log_zone_size = 9; break;
699 case 1024: sbi->s_log_zone_size = 10; break;
700 case 2048: sbi->s_log_zone_size = 11; break;
701
702 default:
703 goto out_bad_zone_size;
704 }
705
706 s->s_magic = ISOFS_SUPER_MAGIC;
707 s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
708
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
716 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
717
718 /* Set this for reference. Its not currently used except on write
719 which we don't have .. */
720
721 first_data_zone = isonum_733(rootp->extent) +
722 isonum_711(rootp->ext_attr_length);
723 sbi->s_firstdatazone = first_data_zone;
724 #ifndef BEQUIET
725 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
726 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
727 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
728 if(sbi->s_high_sierra)
729 printk(KERN_DEBUG "ISOFS: 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)
838 opt.check = 'r';
839 else
840 opt.check = 's';
841 }
842 sbi->s_joliet_level = joliet_level;
843
844 /* check the root inode */
845 if (!inode)
846 goto out_no_root;
847 if (!inode->i_op)
848 goto out_bad_root;
849
850 /* Make sure the root inode is a directory */
851 if (!S_ISDIR(inode->i_mode)) {
852 printk(KERN_WARNING
853 "isofs_fill_super: root inode is not a directory. "
854 "Corrupted media?\n");
855 goto out_iput;
856 }
857
858 /* get the root dentry */
859 s->s_root = d_alloc_root(inode);
860 if (!(s->s_root))
861 goto out_no_root;
862
863 table = 0;
864 if (joliet_level)
865 table += 2;
866 if (opt.check == 'r')
867 table++;
868 s->s_root->d_op = &isofs_dentry_ops[table];
869
870 kfree(opt.iocharset);
871
872 return 0;
873
874 /*
875 * Display error messages and free resources.
876 */
877 out_bad_root:
878 printk(KERN_WARNING "%s: root inode not initialized\n", __func__);
879 goto out_iput;
880 out_no_root:
881 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
882 out_iput:
883 iput(inode);
884 #ifdef CONFIG_JOLIET
885 if (sbi->s_nls_iocharset)
886 unload_nls(sbi->s_nls_iocharset);
887 #endif
888 goto out_freesbi;
889 out_no_read:
890 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
891 __func__, s->s_id, iso_blknum, block);
892 goto out_freesbi;
893 out_bad_zone_size:
894 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
895 sbi->s_log_zone_size);
896 goto out_freebh;
897 out_bad_size:
898 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
899 orig_zonesize, opt.blocksize);
900 goto out_freebh;
901 out_unknown_format:
902 if (!silent)
903 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
904
905 out_freebh:
906 brelse(bh);
907 out_freesbi:
908 kfree(opt.iocharset);
909 kfree(sbi);
910 s->s_fs_info = NULL;
911 return -EINVAL;
912 }
913
914 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
915 {
916 struct super_block *sb = dentry->d_sb;
917
918 buf->f_type = ISOFS_SUPER_MAGIC;
919 buf->f_bsize = sb->s_blocksize;
920 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
921 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
922 buf->f_bfree = 0;
923 buf->f_bavail = 0;
924 buf->f_files = ISOFS_SB(sb)->s_ninodes;
925 buf->f_ffree = 0;
926 buf->f_namelen = NAME_MAX;
927 return 0;
928 }
929
930 /*
931 * Get a set of blocks; filling in buffer_heads if already allocated
932 * or getblk() if they are not. Returns the number of blocks inserted
933 * (0 == error.)
934 */
935 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
936 struct buffer_head **bh, unsigned long nblocks)
937 {
938 unsigned long b_off;
939 unsigned offset, sect_size;
940 unsigned int firstext;
941 unsigned long nextblk, nextoff;
942 long iblock = (long)iblock_s;
943 int section, rv;
944 struct iso_inode_info *ei = ISOFS_I(inode);
945
946 lock_kernel();
947
948 rv = 0;
949 if (iblock < 0 || iblock != iblock_s) {
950 printk(KERN_DEBUG "%s: block number too large\n", __func__);
951 goto abort;
952 }
953
954 b_off = iblock;
955
956 offset = 0;
957 firstext = ei->i_first_extent;
958 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
959 nextblk = ei->i_next_section_block;
960 nextoff = ei->i_next_section_offset;
961 section = 0;
962
963 while (nblocks) {
964 /* If we are *way* beyond the end of the file, print a message.
965 * Access beyond the end of the file up to the next page boundary
966 * is normal, however because of the way the page cache works.
967 * In this case, we just return 0 so that we can properly fill
968 * the page with useless information without generating any
969 * I/O errors.
970 */
971 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
972 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
973 __func__, iblock, (unsigned long) inode->i_size);
974 goto abort;
975 }
976
977 /* On the last section, nextblk == 0, section size is likely to
978 * exceed sect_size by a partial block, and access beyond the
979 * end of the file will reach beyond the section size, too.
980 */
981 while (nextblk && (b_off >= (offset + sect_size))) {
982 struct inode *ninode;
983
984 offset += sect_size;
985 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
986 if (!ninode)
987 goto abort;
988 firstext = ISOFS_I(ninode)->i_first_extent;
989 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
990 nextblk = ISOFS_I(ninode)->i_next_section_block;
991 nextoff = ISOFS_I(ninode)->i_next_section_offset;
992 iput(ninode);
993
994 if (++section > 100) {
995 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
996 " aborting...\n", __func__);
997 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
998 "nextblk=%lu nextoff=%lu\n", __func__,
999 iblock, firstext, (unsigned) sect_size,
1000 nextblk, nextoff);
1001 goto abort;
1002 }
1003 }
1004
1005 if (*bh) {
1006 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1007 } else {
1008 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1009 if (!*bh)
1010 goto abort;
1011 }
1012 bh++; /* Next buffer head */
1013 b_off++; /* Next buffer offset */
1014 nblocks--;
1015 rv++;
1016 }
1017
1018 abort:
1019 unlock_kernel();
1020 return rv;
1021 }
1022
1023 /*
1024 * Used by the standard interfaces.
1025 */
1026 static int isofs_get_block(struct inode *inode, sector_t iblock,
1027 struct buffer_head *bh_result, int create)
1028 {
1029 if (create) {
1030 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1031 return -EROFS;
1032 }
1033
1034 return isofs_get_blocks(inode, iblock, &bh_result, 1) ? 0 : -EIO;
1035 }
1036
1037 static int isofs_bmap(struct inode *inode, sector_t block)
1038 {
1039 struct buffer_head dummy;
1040 int error;
1041
1042 dummy.b_state = 0;
1043 dummy.b_blocknr = -1000;
1044 error = isofs_get_block(inode, block, &dummy, 0);
1045 if (!error)
1046 return dummy.b_blocknr;
1047 return 0;
1048 }
1049
1050 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1051 {
1052 sector_t blknr = isofs_bmap(inode, block);
1053 if (!blknr)
1054 return NULL;
1055 return sb_bread(inode->i_sb, blknr);
1056 }
1057
1058 static int isofs_readpage(struct file *file, struct page *page)
1059 {
1060 return block_read_full_page(page,isofs_get_block);
1061 }
1062
1063 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1064 {
1065 return generic_block_bmap(mapping,block,isofs_get_block);
1066 }
1067
1068 static const struct address_space_operations isofs_aops = {
1069 .readpage = isofs_readpage,
1070 .sync_page = block_sync_page,
1071 .bmap = _isofs_bmap
1072 };
1073
1074 static inline void test_and_set_uid(uid_t *p, uid_t value)
1075 {
1076 if (value)
1077 *p = value;
1078 }
1079
1080 static inline void test_and_set_gid(gid_t *p, gid_t value)
1081 {
1082 if (value)
1083 *p = value;
1084 }
1085
1086 static int isofs_read_level3_size(struct inode *inode)
1087 {
1088 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1089 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1090 struct buffer_head *bh = NULL;
1091 unsigned long block, offset, block_saved, offset_saved;
1092 int i = 0;
1093 int more_entries = 0;
1094 struct iso_directory_record *tmpde = NULL;
1095 struct iso_inode_info *ei = ISOFS_I(inode);
1096
1097 inode->i_size = 0;
1098
1099 /* The first 16 blocks are reserved as the System Area. Thus,
1100 * no inodes can appear in block 0. We use this to flag that
1101 * this is the last section. */
1102 ei->i_next_section_block = 0;
1103 ei->i_next_section_offset = 0;
1104
1105 block = ei->i_iget5_block;
1106 offset = ei->i_iget5_offset;
1107
1108 do {
1109 struct iso_directory_record *de;
1110 unsigned int de_len;
1111
1112 if (!bh) {
1113 bh = sb_bread(inode->i_sb, block);
1114 if (!bh)
1115 goto out_noread;
1116 }
1117 de = (struct iso_directory_record *) (bh->b_data + offset);
1118 de_len = *(unsigned char *) de;
1119
1120 if (de_len == 0) {
1121 brelse(bh);
1122 bh = NULL;
1123 ++block;
1124 offset = 0;
1125 continue;
1126 }
1127
1128 block_saved = block;
1129 offset_saved = offset;
1130 offset += de_len;
1131
1132 /* Make sure we have a full directory entry */
1133 if (offset >= bufsize) {
1134 int slop = bufsize - offset + de_len;
1135 if (!tmpde) {
1136 tmpde = kmalloc(256, GFP_KERNEL);
1137 if (!tmpde)
1138 goto out_nomem;
1139 }
1140 memcpy(tmpde, de, slop);
1141 offset &= bufsize - 1;
1142 block++;
1143 brelse(bh);
1144 bh = NULL;
1145 if (offset) {
1146 bh = sb_bread(inode->i_sb, block);
1147 if (!bh)
1148 goto out_noread;
1149 memcpy((void *)tmpde+slop, bh->b_data, offset);
1150 }
1151 de = tmpde;
1152 }
1153
1154 inode->i_size += isonum_733(de->size);
1155 if (i == 1) {
1156 ei->i_next_section_block = block_saved;
1157 ei->i_next_section_offset = offset_saved;
1158 }
1159
1160 more_entries = de->flags[-high_sierra] & 0x80;
1161
1162 i++;
1163 if (i > 100)
1164 goto out_toomany;
1165 } while (more_entries);
1166 out:
1167 kfree(tmpde);
1168 if (bh)
1169 brelse(bh);
1170 return 0;
1171
1172 out_nomem:
1173 if (bh)
1174 brelse(bh);
1175 return -ENOMEM;
1176
1177 out_noread:
1178 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1179 kfree(tmpde);
1180 return -EIO;
1181
1182 out_toomany:
1183 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1184 "isofs_read_level3_size: inode=%lu\n",
1185 __func__, inode->i_ino);
1186 goto out;
1187 }
1188
1189 static void isofs_read_inode(struct inode *inode)
1190 {
1191 struct super_block *sb = inode->i_sb;
1192 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1193 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1194 unsigned long block;
1195 int high_sierra = sbi->s_high_sierra;
1196 struct buffer_head *bh = NULL;
1197 struct iso_directory_record *de;
1198 struct iso_directory_record *tmpde = NULL;
1199 unsigned int de_len;
1200 unsigned long offset;
1201 struct iso_inode_info *ei = ISOFS_I(inode);
1202
1203 block = ei->i_iget5_block;
1204 bh = sb_bread(inode->i_sb, block);
1205 if (!bh)
1206 goto out_badread;
1207
1208 offset = ei->i_iget5_offset;
1209
1210 de = (struct iso_directory_record *) (bh->b_data + offset);
1211 de_len = *(unsigned char *) de;
1212
1213 if (offset + de_len > bufsize) {
1214 int frag1 = bufsize - offset;
1215
1216 tmpde = kmalloc(de_len, GFP_KERNEL);
1217 if (tmpde == NULL) {
1218 printk(KERN_INFO "%s: out of memory\n", __func__);
1219 goto fail;
1220 }
1221 memcpy(tmpde, bh->b_data + offset, frag1);
1222 brelse(bh);
1223 bh = sb_bread(inode->i_sb, ++block);
1224 if (!bh)
1225 goto out_badread;
1226 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1227 de = tmpde;
1228 }
1229
1230 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1231 ei->i_iget5_offset,
1232 ISOFS_BUFFER_BITS(inode));
1233
1234 /* Assume it is a normal-format file unless told otherwise */
1235 ei->i_file_format = isofs_file_normal;
1236
1237 if (de->flags[-high_sierra] & 2) {
1238 inode->i_mode = S_IRUGO | S_IXUGO | S_IFDIR;
1239 inode->i_nlink = 1; /*
1240 * Set to 1. We know there are 2, but
1241 * the find utility tries to optimize
1242 * if it is 2, and it screws up. It is
1243 * easier to give 1 which tells find to
1244 * do it the hard way.
1245 */
1246 } else {
1247 /* Everybody gets to read the file. */
1248 inode->i_mode = sbi->s_mode;
1249 inode->i_nlink = 1;
1250 inode->i_mode |= S_IFREG;
1251 }
1252 inode->i_uid = sbi->s_uid;
1253 inode->i_gid = sbi->s_gid;
1254 inode->i_blocks = 0;
1255
1256 ei->i_format_parm[0] = 0;
1257 ei->i_format_parm[1] = 0;
1258 ei->i_format_parm[2] = 0;
1259
1260 ei->i_section_size = isonum_733(de->size);
1261 if (de->flags[-high_sierra] & 0x80) {
1262 if(isofs_read_level3_size(inode))
1263 goto fail;
1264 } else {
1265 ei->i_next_section_block = 0;
1266 ei->i_next_section_offset = 0;
1267 inode->i_size = isonum_733(de->size);
1268 }
1269
1270 /*
1271 * Some dipshit decided to store some other bit of information
1272 * in the high byte of the file length. Truncate size in case
1273 * this CDROM was mounted with the cruft option.
1274 */
1275
1276 if (sbi->s_cruft == 'y')
1277 inode->i_size &= 0x00ffffff;
1278
1279 if (de->interleave[0]) {
1280 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1281 inode->i_size = 0;
1282 }
1283
1284 /* I have no idea what file_unit_size is used for, so
1285 we will flag it for now */
1286 if (de->file_unit_size[0] != 0) {
1287 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1288 inode->i_ino);
1289 }
1290
1291 /* I have no idea what other flag bits are used for, so
1292 we will flag it for now */
1293 #ifdef DEBUG
1294 if((de->flags[-high_sierra] & ~2)!= 0){
1295 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1296 "(%ld %x).\n",
1297 inode->i_ino, de->flags[-high_sierra]);
1298 }
1299 #endif
1300
1301 inode->i_mtime.tv_sec =
1302 inode->i_atime.tv_sec =
1303 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1304 inode->i_mtime.tv_nsec =
1305 inode->i_atime.tv_nsec =
1306 inode->i_ctime.tv_nsec = 0;
1307
1308 ei->i_first_extent = (isonum_733(de->extent) +
1309 isonum_711(de->ext_attr_length));
1310
1311 /* Set the number of blocks for stat() - should be done before RR */
1312 inode->i_blocks = (inode->i_size + 511) >> 9;
1313
1314 /*
1315 * Now test for possible Rock Ridge extensions which will override
1316 * some of these numbers in the inode structure.
1317 */
1318
1319 if (!high_sierra) {
1320 parse_rock_ridge_inode(de, inode);
1321 /* if we want uid/gid set, override the rock ridge setting */
1322 test_and_set_uid(&inode->i_uid, sbi->s_uid);
1323 test_and_set_gid(&inode->i_gid, sbi->s_gid);
1324 }
1325
1326 /* Install the inode operations vector */
1327 if (S_ISREG(inode->i_mode)) {
1328 inode->i_fop = &generic_ro_fops;
1329 switch (ei->i_file_format) {
1330 #ifdef CONFIG_ZISOFS
1331 case isofs_file_compressed:
1332 inode->i_data.a_ops = &zisofs_aops;
1333 break;
1334 #endif
1335 default:
1336 inode->i_data.a_ops = &isofs_aops;
1337 break;
1338 }
1339 } else if (S_ISDIR(inode->i_mode)) {
1340 inode->i_op = &isofs_dir_inode_operations;
1341 inode->i_fop = &isofs_dir_operations;
1342 } else if (S_ISLNK(inode->i_mode)) {
1343 inode->i_op = &page_symlink_inode_operations;
1344 inode->i_data.a_ops = &isofs_symlink_aops;
1345 } else
1346 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1347 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1348
1349 out:
1350 kfree(tmpde);
1351 if (bh)
1352 brelse(bh);
1353 return;
1354
1355 out_badread:
1356 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1357 fail:
1358 make_bad_inode(inode);
1359 goto out;
1360 }
1361
1362 struct isofs_iget5_callback_data {
1363 unsigned long block;
1364 unsigned long offset;
1365 };
1366
1367 static int isofs_iget5_test(struct inode *ino, void *data)
1368 {
1369 struct iso_inode_info *i = ISOFS_I(ino);
1370 struct isofs_iget5_callback_data *d =
1371 (struct isofs_iget5_callback_data*)data;
1372 return (i->i_iget5_block == d->block)
1373 && (i->i_iget5_offset == d->offset);
1374 }
1375
1376 static int isofs_iget5_set(struct inode *ino, void *data)
1377 {
1378 struct iso_inode_info *i = ISOFS_I(ino);
1379 struct isofs_iget5_callback_data *d =
1380 (struct isofs_iget5_callback_data*)data;
1381 i->i_iget5_block = d->block;
1382 i->i_iget5_offset = d->offset;
1383 return 0;
1384 }
1385
1386 /* Store, in the inode's containing structure, the block and block
1387 * offset that point to the underlying meta-data for the inode. The
1388 * code below is otherwise similar to the iget() code in
1389 * include/linux/fs.h */
1390 struct inode *isofs_iget(struct super_block *sb,
1391 unsigned long block,
1392 unsigned long offset)
1393 {
1394 unsigned long hashval;
1395 struct inode *inode;
1396 struct isofs_iget5_callback_data data;
1397
1398 if (offset >= 1ul << sb->s_blocksize_bits)
1399 return NULL;
1400
1401 data.block = block;
1402 data.offset = offset;
1403
1404 hashval = (block << sb->s_blocksize_bits) | offset;
1405
1406 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1407 &isofs_iget5_set, &data);
1408
1409 if (inode && (inode->i_state & I_NEW)) {
1410 sb->s_op->read_inode(inode);
1411 unlock_new_inode(inode);
1412 }
1413
1414 return inode;
1415 }
1416
1417 static int isofs_get_sb(struct file_system_type *fs_type,
1418 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1419 {
1420 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1421 mnt);
1422 }
1423
1424 static struct file_system_type iso9660_fs_type = {
1425 .owner = THIS_MODULE,
1426 .name = "iso9660",
1427 .get_sb = isofs_get_sb,
1428 .kill_sb = kill_block_super,
1429 .fs_flags = FS_REQUIRES_DEV,
1430 };
1431
1432 static int __init init_iso9660_fs(void)
1433 {
1434 int err = init_inodecache();
1435 if (err)
1436 goto out;
1437 #ifdef CONFIG_ZISOFS
1438 err = zisofs_init();
1439 if (err)
1440 goto out1;
1441 #endif
1442 err = register_filesystem(&iso9660_fs_type);
1443 if (err)
1444 goto out2;
1445 return 0;
1446 out2:
1447 #ifdef CONFIG_ZISOFS
1448 zisofs_cleanup();
1449 out1:
1450 #endif
1451 destroy_inodecache();
1452 out:
1453 return err;
1454 }
1455
1456 static void __exit exit_iso9660_fs(void)
1457 {
1458 unregister_filesystem(&iso9660_fs_type);
1459 #ifdef CONFIG_ZISOFS
1460 zisofs_cleanup();
1461 #endif
1462 destroy_inodecache();
1463 }
1464
1465 module_init(init_iso9660_fs)
1466 module_exit(exit_iso9660_fs)
1467 MODULE_LICENSE("GPL");
1468 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1469 MODULE_ALIAS("iso9660");
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