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mm/memory_hotplug.c: make scan_lru_pages() static
[linux-2.6/next.git] / fs / isofs / inode.c
blob09ff41a752a092431068b991b9e323bbe5276fbd
1 /*
2 * linux/fs/isofs/inode.c
3 *
4 * (C) 1991 Linus Torvalds - minix filesystem
5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
6 * 1994 Eberhard Mönkeberg - multi session handling.
7 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
8 * 1997 Gordon Chaffee - Joliet CDs
9 * 1998 Eric Lammerts - ISO 9660 Level 3
10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
11 * 2004 Paul Serice - NFS Export Operations
12 */
13
14 #include <linux/init.h>
15 #include <linux/module.h>
16
17 #include <linux/slab.h>
18 #include <linux/nls.h>
19 #include <linux/ctype.h>
20 #include <linux/statfs.h>
21 #include <linux/cdrom.h>
22 #include <linux/parser.h>
23
24 #include "isofs.h"
25 #include "zisofs.h"
26
27 #define BEQUIET
28
29 static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
30 static int isofs_hash(struct dentry *parent, struct qstr *qstr);
31 static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
32 static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
33
34 #ifdef CONFIG_JOLIET
35 static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
36 static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
37 static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
38 static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
39 #endif
40
41 static void isofs_put_super(struct super_block *sb)
42 {
43 struct isofs_sb_info *sbi = ISOFS_SB(sb);
44
45 #ifdef CONFIG_JOLIET
46 unload_nls(sbi->s_nls_iocharset);
47 #endif
48
49 kfree(sbi);
50 sb->s_fs_info = NULL;
51 return;
52 }
53
54 static int isofs_read_inode(struct inode *);
55 static int isofs_statfs (struct dentry *, struct kstatfs *);
56
57 static struct kmem_cache *isofs_inode_cachep;
58
59 static struct inode *isofs_alloc_inode(struct super_block *sb)
60 {
61 struct iso_inode_info *ei;
62 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
63 if (!ei)
64 return NULL;
65 return &ei->vfs_inode;
66 }
67
68 static void isofs_destroy_inode(struct inode *inode)
69 {
70 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
71 }
72
73 static void init_once(void *foo)
74 {
75 struct iso_inode_info *ei = foo;
76
77 inode_init_once(&ei->vfs_inode);
78 }
79
80 static int init_inodecache(void)
81 {
82 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
83 sizeof(struct iso_inode_info),
84 0, (SLAB_RECLAIM_ACCOUNT|
85 SLAB_MEM_SPREAD),
86 init_once);
87 if (isofs_inode_cachep == NULL)
88 return -ENOMEM;
89 return 0;
90 }
91
92 static void destroy_inodecache(void)
93 {
94 kmem_cache_destroy(isofs_inode_cachep);
95 }
96
97 static int isofs_remount(struct super_block *sb, int *flags, char *data)
98 {
99 /* we probably want a lot more here */
100 *flags |= MS_RDONLY;
101 return 0;
102 }
103
104 static const struct super_operations isofs_sops = {
105 .alloc_inode = isofs_alloc_inode,
106 .destroy_inode = isofs_destroy_inode,
107 .put_super = isofs_put_super,
108 .statfs = isofs_statfs,
109 .remount_fs = isofs_remount,
110 .show_options = generic_show_options,
111 };
112
113
114 static const struct dentry_operations isofs_dentry_ops[] = {
115 {
116 .d_hash = isofs_hash,
117 .d_compare = isofs_dentry_cmp,
118 },
119 {
120 .d_hash = isofs_hashi,
121 .d_compare = isofs_dentry_cmpi,
122 },
123 #ifdef CONFIG_JOLIET
124 {
125 .d_hash = isofs_hash_ms,
126 .d_compare = isofs_dentry_cmp_ms,
127 },
128 {
129 .d_hash = isofs_hashi_ms,
130 .d_compare = isofs_dentry_cmpi_ms,
131 },
132 #endif
133 };
134
135 struct iso9660_options{
136 unsigned int rock:1;
137 unsigned int joliet:1;
138 unsigned int cruft:1;
139 unsigned int hide:1;
140 unsigned int showassoc:1;
141 unsigned int nocompress:1;
142 unsigned int overriderockperm:1;
143 unsigned int uid_set:1;
144 unsigned int gid_set:1;
145 unsigned int utf8:1;
146 unsigned char map;
147 unsigned char check;
148 unsigned int blocksize;
149 mode_t fmode;
150 mode_t dmode;
151 gid_t gid;
152 uid_t uid;
153 char *iocharset;
154 /* LVE */
155 s32 session;
156 s32 sbsector;
157 };
158
159 /*
160 * Compute the hash for the isofs name corresponding to the dentry.
161 */
162 static int
163 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
164 {
165 const char *name;
166 int len;
167
168 len = qstr->len;
169 name = qstr->name;
170 if (ms) {
171 while (len && name[len-1] == '.')
172 len--;
173 }
174
175 qstr->hash = full_name_hash(name, len);
176
177 return 0;
178 }
179
180 /*
181 * Compute the hash for the isofs name corresponding to the dentry.
182 */
183 static int
184 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
185 {
186 const char *name;
187 int len;
188 char c;
189 unsigned long hash;
190
191 len = qstr->len;
192 name = qstr->name;
193 if (ms) {
194 while (len && name[len-1] == '.')
195 len--;
196 }
197
198 hash = init_name_hash();
199 while (len--) {
200 c = tolower(*name++);
201 hash = partial_name_hash(c, hash);
202 }
203 qstr->hash = end_name_hash(hash);
204
205 return 0;
206 }
207
208 /*
209 * Case insensitive compare of two isofs names.
210 */
211 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
212 struct qstr *b, int ms)
213 {
214 int alen, blen;
215
216 /* A filename cannot end in '.' or we treat it like it has none */
217 alen = a->len;
218 blen = b->len;
219 if (ms) {
220 while (alen && a->name[alen-1] == '.')
221 alen--;
222 while (blen && b->name[blen-1] == '.')
223 blen--;
224 }
225 if (alen == blen) {
226 if (strnicmp(a->name, b->name, alen) == 0)
227 return 0;
228 }
229 return 1;
230 }
231
232 /*
233 * Case sensitive compare of two isofs names.
234 */
235 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
236 struct qstr *b, int ms)
237 {
238 int alen, blen;
239
240 /* A filename cannot end in '.' or we treat it like it has none */
241 alen = a->len;
242 blen = b->len;
243 if (ms) {
244 while (alen && a->name[alen-1] == '.')
245 alen--;
246 while (blen && b->name[blen-1] == '.')
247 blen--;
248 }
249 if (alen == blen) {
250 if (strncmp(a->name, b->name, alen) == 0)
251 return 0;
252 }
253 return 1;
254 }
255
256 static int
257 isofs_hash(struct dentry *dentry, struct qstr *qstr)
258 {
259 return isofs_hash_common(dentry, qstr, 0);
260 }
261
262 static int
263 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
264 {
265 return isofs_hashi_common(dentry, qstr, 0);
266 }
267
268 static int
269 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
270 {
271 return isofs_dentry_cmp_common(dentry, a, b, 0);
272 }
273
274 static int
275 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
276 {
277 return isofs_dentry_cmpi_common(dentry, a, b, 0);
278 }
279
280 #ifdef CONFIG_JOLIET
281 static int
282 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
283 {
284 return isofs_hash_common(dentry, qstr, 1);
285 }
286
287 static int
288 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
289 {
290 return isofs_hashi_common(dentry, qstr, 1);
291 }
292
293 static int
294 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
295 {
296 return isofs_dentry_cmp_common(dentry, a, b, 1);
297 }
298
299 static int
300 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
301 {
302 return isofs_dentry_cmpi_common(dentry, a, b, 1);
303 }
304 #endif
305
306 enum {
307 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
308 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
309 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
310 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
311 };
312
313 static const match_table_t tokens = {
314 {Opt_norock, "norock"},
315 {Opt_nojoliet, "nojoliet"},
316 {Opt_unhide, "unhide"},
317 {Opt_hide, "hide"},
318 {Opt_showassoc, "showassoc"},
319 {Opt_cruft, "cruft"},
320 {Opt_utf8, "utf8"},
321 {Opt_iocharset, "iocharset=%s"},
322 {Opt_map_a, "map=acorn"},
323 {Opt_map_a, "map=a"},
324 {Opt_map_n, "map=normal"},
325 {Opt_map_n, "map=n"},
326 {Opt_map_o, "map=off"},
327 {Opt_map_o, "map=o"},
328 {Opt_session, "session=%u"},
329 {Opt_sb, "sbsector=%u"},
330 {Opt_check_r, "check=relaxed"},
331 {Opt_check_r, "check=r"},
332 {Opt_check_s, "check=strict"},
333 {Opt_check_s, "check=s"},
334 {Opt_uid, "uid=%u"},
335 {Opt_gid, "gid=%u"},
336 {Opt_mode, "mode=%u"},
337 {Opt_dmode, "dmode=%u"},
338 {Opt_overriderockperm, "overriderockperm"},
339 {Opt_block, "block=%u"},
340 {Opt_ignore, "conv=binary"},
341 {Opt_ignore, "conv=b"},
342 {Opt_ignore, "conv=text"},
343 {Opt_ignore, "conv=t"},
344 {Opt_ignore, "conv=mtext"},
345 {Opt_ignore, "conv=m"},
346 {Opt_ignore, "conv=auto"},
347 {Opt_ignore, "conv=a"},
348 {Opt_nocompress, "nocompress"},
349 {Opt_err, NULL}
350 };
351
352 static int parse_options(char *options, struct iso9660_options *popt)
353 {
354 char *p;
355 int option;
356
357 popt->map = 'n';
358 popt->rock = 1;
359 popt->joliet = 1;
360 popt->cruft = 0;
361 popt->hide = 0;
362 popt->showassoc = 0;
363 popt->check = 'u'; /* unset */
364 popt->nocompress = 0;
365 popt->blocksize = 1024;
366 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
367 popt->uid_set = 0;
368 popt->gid_set = 0;
369 popt->gid = 0;
370 popt->uid = 0;
371 popt->iocharset = NULL;
372 popt->utf8 = 0;
373 popt->overriderockperm = 0;
374 popt->session=-1;
375 popt->sbsector=-1;
376 if (!options)
377 return 1;
378
379 while ((p = strsep(&options, ",")) != NULL) {
380 int token;
381 substring_t args[MAX_OPT_ARGS];
382 unsigned n;
383
384 if (!*p)
385 continue;
386
387 token = match_token(p, tokens, args);
388 switch (token) {
389 case Opt_norock:
390 popt->rock = 0;
391 break;
392 case Opt_nojoliet:
393 popt->joliet = 0;
394 break;
395 case Opt_hide:
396 popt->hide = 1;
397 break;
398 case Opt_unhide:
399 case Opt_showassoc:
400 popt->showassoc = 1;
401 break;
402 case Opt_cruft:
403 popt->cruft = 1;
404 break;
405 case Opt_utf8:
406 popt->utf8 = 1;
407 break;
408 #ifdef CONFIG_JOLIET
409 case Opt_iocharset:
410 popt->iocharset = match_strdup(&args[0]);
411 break;
412 #endif
413 case Opt_map_a:
414 popt->map = 'a';
415 break;
416 case Opt_map_o:
417 popt->map = 'o';
418 break;
419 case Opt_map_n:
420 popt->map = 'n';
421 break;
422 case Opt_session:
423 if (match_int(&args[0], &option))
424 return 0;
425 n = option;
426 if (n > 99)
427 return 0;
428 popt->session = n + 1;
429 break;
430 case Opt_sb:
431 if (match_int(&args[0], &option))
432 return 0;
433 popt->sbsector = option;
434 break;
435 case Opt_check_r:
436 popt->check = 'r';
437 break;
438 case Opt_check_s:
439 popt->check = 's';
440 break;
441 case Opt_ignore:
442 break;
443 case Opt_uid:
444 if (match_int(&args[0], &option))
445 return 0;
446 popt->uid = option;
447 popt->uid_set = 1;
448 break;
449 case Opt_gid:
450 if (match_int(&args[0], &option))
451 return 0;
452 popt->gid = option;
453 popt->gid_set = 1;
454 break;
455 case Opt_mode:
456 if (match_int(&args[0], &option))
457 return 0;
458 popt->fmode = option;
459 break;
460 case Opt_dmode:
461 if (match_int(&args[0], &option))
462 return 0;
463 popt->dmode = option;
464 break;
465 case Opt_overriderockperm:
466 popt->overriderockperm = 1;
467 break;
468 case Opt_block:
469 if (match_int(&args[0], &option))
470 return 0;
471 n = option;
472 if (n != 512 && n != 1024 && n != 2048)
473 return 0;
474 popt->blocksize = n;
475 break;
476 case Opt_nocompress:
477 popt->nocompress = 1;
478 break;
479 default:
480 return 0;
481 }
482 }
483 return 1;
484 }
485
486 /*
487 * look if the driver can tell the multi session redirection value
488 *
489 * don't change this if you don't know what you do, please!
490 * Multisession is legal only with XA disks.
491 * A non-XA disk with more than one volume descriptor may do it right, but
492 * usually is written in a nowhere standardized "multi-partition" manner.
493 * Multisession uses absolute addressing (solely the first frame of the whole
494 * track is #0), multi-partition uses relative addressing (each first frame of
495 * each track is #0), and a track is not a session.
496 *
497 * A broken CDwriter software or drive firmware does not set new standards,
498 * at least not if conflicting with the existing ones.
499 *
500 * emoenke@gwdg.de
501 */
502 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
503
504 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
505 {
506 struct cdrom_multisession ms_info;
507 unsigned int vol_desc_start;
508 struct block_device *bdev = sb->s_bdev;
509 int i;
510
511 vol_desc_start=0;
512 ms_info.addr_format=CDROM_LBA;
513 if(session >= 0 && session <= 99) {
514 struct cdrom_tocentry Te;
515 Te.cdte_track=session;
516 Te.cdte_format=CDROM_LBA;
517 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
518 if (!i) {
519 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
520 session, Te.cdte_addr.lba,
521 Te.cdte_ctrl&CDROM_DATA_TRACK);
522 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
523 return Te.cdte_addr.lba;
524 }
525
526 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
527 }
528 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
529 if (session > 0)
530 printk(KERN_ERR "ISOFS: Invalid session number\n");
531 #if 0
532 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
533 if (i==0) {
534 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
535 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
536 }
537 #endif
538 if (i==0)
539 #if WE_OBEY_THE_WRITTEN_STANDARDS
540 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
541 #endif
542 vol_desc_start=ms_info.addr.lba;
543 return vol_desc_start;
544 }
545
546 /*
547 * Initialize the superblock and read the root inode.
548 *
549 * Note: a check_disk_change() has been done immediately prior
550 * to this call, so we don't need to check again.
551 */
552 static int isofs_fill_super(struct super_block *s, void *data, int silent)
553 {
554 struct buffer_head *bh = NULL, *pri_bh = NULL;
555 struct hs_primary_descriptor *h_pri = NULL;
556 struct iso_primary_descriptor *pri = NULL;
557 struct iso_supplementary_descriptor *sec = NULL;
558 struct iso_directory_record *rootp;
559 struct inode *inode;
560 struct iso9660_options opt;
561 struct isofs_sb_info *sbi;
562 unsigned long first_data_zone;
563 int joliet_level = 0;
564 int iso_blknum, block;
565 int orig_zonesize;
566 int table, error = -EINVAL;
567 unsigned int vol_desc_start;
568
569 save_mount_options(s, data);
570
571 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
572 if (!sbi)
573 return -ENOMEM;
574 s->s_fs_info = sbi;
575
576 if (!parse_options((char *)data, &opt))
577 goto out_freesbi;
578
579 /*
580 * First of all, get the hardware blocksize for this device.
581 * If we don't know what it is, or the hardware blocksize is
582 * larger than the blocksize the user specified, then use
583 * that value.
584 */
585 /*
586 * What if bugger tells us to go beyond page size?
587 */
588 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
589
590 sbi->s_high_sierra = 0; /* default is iso9660 */
591
592 vol_desc_start = (opt.sbsector != -1) ?
593 opt.sbsector : isofs_get_last_session(s,opt.session);
594
595 for (iso_blknum = vol_desc_start+16;
596 iso_blknum < vol_desc_start+100; iso_blknum++) {
597 struct hs_volume_descriptor *hdp;
598 struct iso_volume_descriptor *vdp;
599
600 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
601 if (!(bh = sb_bread(s, block)))
602 goto out_no_read;
603
604 vdp = (struct iso_volume_descriptor *)bh->b_data;
605 hdp = (struct hs_volume_descriptor *)bh->b_data;
606
607 /*
608 * Due to the overlapping physical location of the descriptors,
609 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
610 * proper identification in this case, we first check for ISO.
611 */
612 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
613 if (isonum_711(vdp->type) == ISO_VD_END)
614 break;
615 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
616 if (pri == NULL) {
617 pri = (struct iso_primary_descriptor *)vdp;
618 /* Save the buffer in case we need it ... */
619 pri_bh = bh;
620 bh = NULL;
621 }
622 }
623 #ifdef CONFIG_JOLIET
624 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
625 sec = (struct iso_supplementary_descriptor *)vdp;
626 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
627 if (opt.joliet) {
628 if (sec->escape[2] == 0x40)
629 joliet_level = 1;
630 else if (sec->escape[2] == 0x43)
631 joliet_level = 2;
632 else if (sec->escape[2] == 0x45)
633 joliet_level = 3;
634
635 printk(KERN_DEBUG "ISO 9660 Extensions: "
636 "Microsoft Joliet Level %d\n",
637 joliet_level);
638 }
639 goto root_found;
640 } else {
641 /* Unknown supplementary volume descriptor */
642 sec = NULL;
643 }
644 }
645 #endif
646 } else {
647 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
648 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
649 goto out_freebh;
650
651 sbi->s_high_sierra = 1;
652 opt.rock = 0;
653 h_pri = (struct hs_primary_descriptor *)vdp;
654 goto root_found;
655 }
656 }
657
658 /* Just skip any volume descriptors we don't recognize */
659
660 brelse(bh);
661 bh = NULL;
662 }
663 /*
664 * If we fall through, either no volume descriptor was found,
665 * or else we passed a primary descriptor looking for others.
666 */
667 if (!pri)
668 goto out_unknown_format;
669 brelse(bh);
670 bh = pri_bh;
671 pri_bh = NULL;
672
673 root_found:
674
675 if (joliet_level && (pri == NULL || !opt.rock)) {
676 /* This is the case of Joliet with the norock mount flag.
677 * A disc with both Joliet and Rock Ridge is handled later
678 */
679 pri = (struct iso_primary_descriptor *) sec;
680 }
681
682 if(sbi->s_high_sierra){
683 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
684 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
685 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
686 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
687 } else {
688 if (!pri)
689 goto out_freebh;
690 rootp = (struct iso_directory_record *) pri->root_directory_record;
691 sbi->s_nzones = isonum_733(pri->volume_space_size);
692 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
693 sbi->s_max_size = isonum_733(pri->volume_space_size);
694 }
695
696 sbi->s_ninodes = 0; /* No way to figure this out easily */
697
698 orig_zonesize = sbi->s_log_zone_size;
699 /*
700 * If the zone size is smaller than the hardware sector size,
701 * this is a fatal error. This would occur if the disc drive
702 * had sectors that were 2048 bytes, but the filesystem had
703 * blocks that were 512 bytes (which should only very rarely
704 * happen.)
705 */
706 if (orig_zonesize < opt.blocksize)
707 goto out_bad_size;
708
709 /* RDE: convert log zone size to bit shift */
710 switch (sbi->s_log_zone_size) {
711 case 512: sbi->s_log_zone_size = 9; break;
712 case 1024: sbi->s_log_zone_size = 10; break;
713 case 2048: sbi->s_log_zone_size = 11; break;
714
715 default:
716 goto out_bad_zone_size;
717 }
718
719 s->s_magic = ISOFS_SUPER_MAGIC;
720
721 /*
722 * With multi-extent files, file size is only limited by the maximum
723 * size of a file system, which is 8 TB.
724 */
725 s->s_maxbytes = 0x80000000000LL;
726
727 /*
728 * The CDROM is read-only, has no nodes (devices) on it, and since
729 * all of the files appear to be owned by root, we really do not want
730 * to allow suid. (suid or devices will not show up unless we have
731 * Rock Ridge extensions)
732 */
733
734 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
735
736 /* Set this for reference. Its not currently used except on write
737 which we don't have .. */
738
739 first_data_zone = isonum_733(rootp->extent) +
740 isonum_711(rootp->ext_attr_length);
741 sbi->s_firstdatazone = first_data_zone;
742 #ifndef BEQUIET
743 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
744 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
745 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
746 if(sbi->s_high_sierra)
747 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
748 #endif
749
750 /*
751 * If the Joliet level is set, we _may_ decide to use the
752 * secondary descriptor, but can't be sure until after we
753 * read the root inode. But before reading the root inode
754 * we may need to change the device blocksize, and would
755 * rather release the old buffer first. So, we cache the
756 * first_data_zone value from the secondary descriptor.
757 */
758 if (joliet_level) {
759 pri = (struct iso_primary_descriptor *) sec;
760 rootp = (struct iso_directory_record *)
761 pri->root_directory_record;
762 first_data_zone = isonum_733(rootp->extent) +
763 isonum_711(rootp->ext_attr_length);
764 }
765
766 /*
767 * We're all done using the volume descriptor, and may need
768 * to change the device blocksize, so release the buffer now.
769 */
770 brelse(pri_bh);
771 brelse(bh);
772
773 /*
774 * Force the blocksize to 512 for 512 byte sectors. The file
775 * read primitives really get it wrong in a bad way if we don't
776 * do this.
777 *
778 * Note - we should never be setting the blocksize to something
779 * less than the hardware sector size for the device. If we
780 * do, we would end up having to read larger buffers and split
781 * out portions to satisfy requests.
782 *
783 * Note2- the idea here is that we want to deal with the optimal
784 * zonesize in the filesystem. If we have it set to something less,
785 * then we have horrible problems with trying to piece together
786 * bits of adjacent blocks in order to properly read directory
787 * entries. By forcing the blocksize in this way, we ensure
788 * that we will never be required to do this.
789 */
790 sb_set_blocksize(s, orig_zonesize);
791
792 sbi->s_nls_iocharset = NULL;
793
794 #ifdef CONFIG_JOLIET
795 if (joliet_level && opt.utf8 == 0) {
796 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
797 sbi->s_nls_iocharset = load_nls(p);
798 if (! sbi->s_nls_iocharset) {
799 /* Fail only if explicit charset specified */
800 if (opt.iocharset)
801 goto out_freesbi;
802 sbi->s_nls_iocharset = load_nls_default();
803 }
804 }
805 #endif
806 s->s_op = &isofs_sops;
807 s->s_export_op = &isofs_export_ops;
808 sbi->s_mapping = opt.map;
809 sbi->s_rock = (opt.rock ? 2 : 0);
810 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
811 sbi->s_cruft = opt.cruft;
812 sbi->s_hide = opt.hide;
813 sbi->s_showassoc = opt.showassoc;
814 sbi->s_uid = opt.uid;
815 sbi->s_gid = opt.gid;
816 sbi->s_uid_set = opt.uid_set;
817 sbi->s_gid_set = opt.gid_set;
818 sbi->s_utf8 = opt.utf8;
819 sbi->s_nocompress = opt.nocompress;
820 sbi->s_overriderockperm = opt.overriderockperm;
821 mutex_init(&sbi->s_mutex);
822 /*
823 * It would be incredibly stupid to allow people to mark every file
824 * on the disk as suid, so we merely allow them to set the default
825 * permissions.
826 */
827 if (opt.fmode != ISOFS_INVALID_MODE)
828 sbi->s_fmode = opt.fmode & 0777;
829 else
830 sbi->s_fmode = ISOFS_INVALID_MODE;
831 if (opt.dmode != ISOFS_INVALID_MODE)
832 sbi->s_dmode = opt.dmode & 0777;
833 else
834 sbi->s_dmode = ISOFS_INVALID_MODE;
835
836 /*
837 * Read the root inode, which _may_ result in changing
838 * the s_rock flag. Once we have the final s_rock value,
839 * we then decide whether to use the Joliet descriptor.
840 */
841 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
842 if (IS_ERR(inode))
843 goto out_no_root;
844
845 /*
846 * If this disk has both Rock Ridge and Joliet on it, then we
847 * want to use Rock Ridge by default. This can be overridden
848 * by using the norock mount option. There is still one other
849 * possibility that is not taken into account: a Rock Ridge
850 * CD with Unicode names. Until someone sees such a beast, it
851 * will not be supported.
852 */
853 if (sbi->s_rock == 1) {
854 joliet_level = 0;
855 } else if (joliet_level) {
856 sbi->s_rock = 0;
857 if (sbi->s_firstdatazone != first_data_zone) {
858 sbi->s_firstdatazone = first_data_zone;
859 printk(KERN_DEBUG
860 "ISOFS: changing to secondary root\n");
861 iput(inode);
862 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
863 if (IS_ERR(inode))
864 goto out_no_root;
865 }
866 }
867
868 if (opt.check == 'u') {
869 /* Only Joliet is case insensitive by default */
870 if (joliet_level)
871 opt.check = 'r';
872 else
873 opt.check = 's';
874 }
875 sbi->s_joliet_level = joliet_level;
876
877 /* Make sure the root inode is a directory */
878 if (!S_ISDIR(inode->i_mode)) {
879 printk(KERN_WARNING
880 "isofs_fill_super: root inode is not a directory. "
881 "Corrupted media?\n");
882 goto out_iput;
883 }
884
885 /* get the root dentry */
886 s->s_root = d_alloc_root(inode);
887 if (!(s->s_root))
888 goto out_no_root;
889
890 table = 0;
891 if (joliet_level)
892 table += 2;
893 if (opt.check == 'r')
894 table++;
895 s->s_root->d_op = &isofs_dentry_ops[table];
896
897 kfree(opt.iocharset);
898
899 return 0;
900
901 /*
902 * Display error messages and free resources.
903 */
904 out_iput:
905 iput(inode);
906 goto out_no_inode;
907 out_no_root:
908 error = PTR_ERR(inode);
909 if (error != -ENOMEM)
910 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
911 out_no_inode:
912 #ifdef CONFIG_JOLIET
913 unload_nls(sbi->s_nls_iocharset);
914 #endif
915 goto out_freesbi;
916 out_no_read:
917 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
918 __func__, s->s_id, iso_blknum, block);
919 goto out_freesbi;
920 out_bad_zone_size:
921 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
922 sbi->s_log_zone_size);
923 goto out_freebh;
924 out_bad_size:
925 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
926 orig_zonesize, opt.blocksize);
927 goto out_freebh;
928 out_unknown_format:
929 if (!silent)
930 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
931
932 out_freebh:
933 brelse(bh);
934 out_freesbi:
935 kfree(opt.iocharset);
936 kfree(sbi);
937 s->s_fs_info = NULL;
938 return error;
939 }
940
941 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
942 {
943 struct super_block *sb = dentry->d_sb;
944 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
945
946 buf->f_type = ISOFS_SUPER_MAGIC;
947 buf->f_bsize = sb->s_blocksize;
948 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
949 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
950 buf->f_bfree = 0;
951 buf->f_bavail = 0;
952 buf->f_files = ISOFS_SB(sb)->s_ninodes;
953 buf->f_ffree = 0;
954 buf->f_fsid.val[0] = (u32)id;
955 buf->f_fsid.val[1] = (u32)(id >> 32);
956 buf->f_namelen = NAME_MAX;
957 return 0;
958 }
959
960 /*
961 * Get a set of blocks; filling in buffer_heads if already allocated
962 * or getblk() if they are not. Returns the number of blocks inserted
963 * (-ve == error.)
964 */
965 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
966 struct buffer_head **bh, unsigned long nblocks)
967 {
968 unsigned long b_off;
969 unsigned offset, sect_size;
970 unsigned int firstext;
971 unsigned long nextblk, nextoff;
972 long iblock = (long)iblock_s;
973 int section, rv, error;
974 struct iso_inode_info *ei = ISOFS_I(inode);
975
976 error = -EIO;
977 rv = 0;
978 if (iblock < 0 || iblock != iblock_s) {
979 printk(KERN_DEBUG "%s: block number too large\n", __func__);
980 goto abort;
981 }
982
983 b_off = iblock;
984
985 offset = 0;
986 firstext = ei->i_first_extent;
987 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
988 nextblk = ei->i_next_section_block;
989 nextoff = ei->i_next_section_offset;
990 section = 0;
991
992 while (nblocks) {
993 /* If we are *way* beyond the end of the file, print a message.
994 * Access beyond the end of the file up to the next page boundary
995 * is normal, however because of the way the page cache works.
996 * In this case, we just return 0 so that we can properly fill
997 * the page with useless information without generating any
998 * I/O errors.
999 */
1000 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1001 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
1002 __func__, iblock, (unsigned long) inode->i_size);
1003 goto abort;
1004 }
1005
1006 /* On the last section, nextblk == 0, section size is likely to
1007 * exceed sect_size by a partial block, and access beyond the
1008 * end of the file will reach beyond the section size, too.
1009 */
1010 while (nextblk && (b_off >= (offset + sect_size))) {
1011 struct inode *ninode;
1012
1013 offset += sect_size;
1014 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1015 if (IS_ERR(ninode)) {
1016 error = PTR_ERR(ninode);
1017 goto abort;
1018 }
1019 firstext = ISOFS_I(ninode)->i_first_extent;
1020 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1021 nextblk = ISOFS_I(ninode)->i_next_section_block;
1022 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1023 iput(ninode);
1024
1025 if (++section > 100) {
1026 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1027 " aborting...\n", __func__);
1028 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1029 "nextblk=%lu nextoff=%lu\n", __func__,
1030 iblock, firstext, (unsigned) sect_size,
1031 nextblk, nextoff);
1032 goto abort;
1033 }
1034 }
1035
1036 if (*bh) {
1037 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1038 } else {
1039 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1040 if (!*bh)
1041 goto abort;
1042 }
1043 bh++; /* Next buffer head */
1044 b_off++; /* Next buffer offset */
1045 nblocks--;
1046 rv++;
1047 }
1048
1049 error = 0;
1050 abort:
1051 return rv != 0 ? rv : error;
1052 }
1053
1054 /*
1055 * Used by the standard interfaces.
1056 */
1057 static int isofs_get_block(struct inode *inode, sector_t iblock,
1058 struct buffer_head *bh_result, int create)
1059 {
1060 int ret;
1061
1062 if (create) {
1063 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1064 return -EROFS;
1065 }
1066
1067 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1068 return ret < 0 ? ret : 0;
1069 }
1070
1071 static int isofs_bmap(struct inode *inode, sector_t block)
1072 {
1073 struct buffer_head dummy;
1074 int error;
1075
1076 dummy.b_state = 0;
1077 dummy.b_blocknr = -1000;
1078 error = isofs_get_block(inode, block, &dummy, 0);
1079 if (!error)
1080 return dummy.b_blocknr;
1081 return 0;
1082 }
1083
1084 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1085 {
1086 sector_t blknr = isofs_bmap(inode, block);
1087 if (!blknr)
1088 return NULL;
1089 return sb_bread(inode->i_sb, blknr);
1090 }
1091
1092 static int isofs_readpage(struct file *file, struct page *page)
1093 {
1094 return block_read_full_page(page,isofs_get_block);
1095 }
1096
1097 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1098 {
1099 return generic_block_bmap(mapping,block,isofs_get_block);
1100 }
1101
1102 static const struct address_space_operations isofs_aops = {
1103 .readpage = isofs_readpage,
1104 .sync_page = block_sync_page,
1105 .bmap = _isofs_bmap
1106 };
1107
1108 static int isofs_read_level3_size(struct inode *inode)
1109 {
1110 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1111 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1112 struct buffer_head *bh = NULL;
1113 unsigned long block, offset, block_saved, offset_saved;
1114 int i = 0;
1115 int more_entries = 0;
1116 struct iso_directory_record *tmpde = NULL;
1117 struct iso_inode_info *ei = ISOFS_I(inode);
1118
1119 inode->i_size = 0;
1120
1121 /* The first 16 blocks are reserved as the System Area. Thus,
1122 * no inodes can appear in block 0. We use this to flag that
1123 * this is the last section. */
1124 ei->i_next_section_block = 0;
1125 ei->i_next_section_offset = 0;
1126
1127 block = ei->i_iget5_block;
1128 offset = ei->i_iget5_offset;
1129
1130 do {
1131 struct iso_directory_record *de;
1132 unsigned int de_len;
1133
1134 if (!bh) {
1135 bh = sb_bread(inode->i_sb, block);
1136 if (!bh)
1137 goto out_noread;
1138 }
1139 de = (struct iso_directory_record *) (bh->b_data + offset);
1140 de_len = *(unsigned char *) de;
1141
1142 if (de_len == 0) {
1143 brelse(bh);
1144 bh = NULL;
1145 ++block;
1146 offset = 0;
1147 continue;
1148 }
1149
1150 block_saved = block;
1151 offset_saved = offset;
1152 offset += de_len;
1153
1154 /* Make sure we have a full directory entry */
1155 if (offset >= bufsize) {
1156 int slop = bufsize - offset + de_len;
1157 if (!tmpde) {
1158 tmpde = kmalloc(256, GFP_KERNEL);
1159 if (!tmpde)
1160 goto out_nomem;
1161 }
1162 memcpy(tmpde, de, slop);
1163 offset &= bufsize - 1;
1164 block++;
1165 brelse(bh);
1166 bh = NULL;
1167 if (offset) {
1168 bh = sb_bread(inode->i_sb, block);
1169 if (!bh)
1170 goto out_noread;
1171 memcpy((void *)tmpde+slop, bh->b_data, offset);
1172 }
1173 de = tmpde;
1174 }
1175
1176 inode->i_size += isonum_733(de->size);
1177 if (i == 1) {
1178 ei->i_next_section_block = block_saved;
1179 ei->i_next_section_offset = offset_saved;
1180 }
1181
1182 more_entries = de->flags[-high_sierra] & 0x80;
1183
1184 i++;
1185 if (i > 100)
1186 goto out_toomany;
1187 } while (more_entries);
1188 out:
1189 kfree(tmpde);
1190 if (bh)
1191 brelse(bh);
1192 return 0;
1193
1194 out_nomem:
1195 if (bh)
1196 brelse(bh);
1197 return -ENOMEM;
1198
1199 out_noread:
1200 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1201 kfree(tmpde);
1202 return -EIO;
1203
1204 out_toomany:
1205 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1206 "isofs_read_level3_size: inode=%lu\n",
1207 __func__, inode->i_ino);
1208 goto out;
1209 }
1210
1211 static int isofs_read_inode(struct inode *inode)
1212 {
1213 struct super_block *sb = inode->i_sb;
1214 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1215 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1216 unsigned long block;
1217 int high_sierra = sbi->s_high_sierra;
1218 struct buffer_head *bh = NULL;
1219 struct iso_directory_record *de;
1220 struct iso_directory_record *tmpde = NULL;
1221 unsigned int de_len;
1222 unsigned long offset;
1223 struct iso_inode_info *ei = ISOFS_I(inode);
1224 int ret = -EIO;
1225
1226 block = ei->i_iget5_block;
1227 bh = sb_bread(inode->i_sb, block);
1228 if (!bh)
1229 goto out_badread;
1230
1231 offset = ei->i_iget5_offset;
1232
1233 de = (struct iso_directory_record *) (bh->b_data + offset);
1234 de_len = *(unsigned char *) de;
1235
1236 if (offset + de_len > bufsize) {
1237 int frag1 = bufsize - offset;
1238
1239 tmpde = kmalloc(de_len, GFP_KERNEL);
1240 if (tmpde == NULL) {
1241 printk(KERN_INFO "%s: out of memory\n", __func__);
1242 ret = -ENOMEM;
1243 goto fail;
1244 }
1245 memcpy(tmpde, bh->b_data + offset, frag1);
1246 brelse(bh);
1247 bh = sb_bread(inode->i_sb, ++block);
1248 if (!bh)
1249 goto out_badread;
1250 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1251 de = tmpde;
1252 }
1253
1254 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1255 ei->i_iget5_offset,
1256 ISOFS_BUFFER_BITS(inode));
1257
1258 /* Assume it is a normal-format file unless told otherwise */
1259 ei->i_file_format = isofs_file_normal;
1260
1261 if (de->flags[-high_sierra] & 2) {
1262 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1263 inode->i_mode = S_IFDIR | sbi->s_dmode;
1264 else
1265 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1266 inode->i_nlink = 1; /*
1267 * Set to 1. We know there are 2, but
1268 * the find utility tries to optimize
1269 * if it is 2, and it screws up. It is
1270 * easier to give 1 which tells find to
1271 * do it the hard way.
1272 */
1273 } else {
1274 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1275 inode->i_mode = S_IFREG | sbi->s_fmode;
1276 } else {
1277 /*
1278 * Set default permissions: r-x for all. The disc
1279 * could be shared with DOS machines so virtually
1280 * anything could be a valid executable.
1281 */
1282 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1283 }
1284 inode->i_nlink = 1;
1285 }
1286 inode->i_uid = sbi->s_uid;
1287 inode->i_gid = sbi->s_gid;
1288 inode->i_blocks = 0;
1289
1290 ei->i_format_parm[0] = 0;
1291 ei->i_format_parm[1] = 0;
1292 ei->i_format_parm[2] = 0;
1293
1294 ei->i_section_size = isonum_733(de->size);
1295 if (de->flags[-high_sierra] & 0x80) {
1296 ret = isofs_read_level3_size(inode);
1297 if (ret < 0)
1298 goto fail;
1299 ret = -EIO;
1300 } else {
1301 ei->i_next_section_block = 0;
1302 ei->i_next_section_offset = 0;
1303 inode->i_size = isonum_733(de->size);
1304 }
1305
1306 /*
1307 * Some dipshit decided to store some other bit of information
1308 * in the high byte of the file length. Truncate size in case
1309 * this CDROM was mounted with the cruft option.
1310 */
1311
1312 if (sbi->s_cruft)
1313 inode->i_size &= 0x00ffffff;
1314
1315 if (de->interleave[0]) {
1316 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1317 inode->i_size = 0;
1318 }
1319
1320 /* I have no idea what file_unit_size is used for, so
1321 we will flag it for now */
1322 if (de->file_unit_size[0] != 0) {
1323 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1324 inode->i_ino);
1325 }
1326
1327 /* I have no idea what other flag bits are used for, so
1328 we will flag it for now */
1329 #ifdef DEBUG
1330 if((de->flags[-high_sierra] & ~2)!= 0){
1331 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1332 "(%ld %x).\n",
1333 inode->i_ino, de->flags[-high_sierra]);
1334 }
1335 #endif
1336
1337 inode->i_mtime.tv_sec =
1338 inode->i_atime.tv_sec =
1339 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1340 inode->i_mtime.tv_nsec =
1341 inode->i_atime.tv_nsec =
1342 inode->i_ctime.tv_nsec = 0;
1343
1344 ei->i_first_extent = (isonum_733(de->extent) +
1345 isonum_711(de->ext_attr_length));
1346
1347 /* Set the number of blocks for stat() - should be done before RR */
1348 inode->i_blocks = (inode->i_size + 511) >> 9;
1349
1350 /*
1351 * Now test for possible Rock Ridge extensions which will override
1352 * some of these numbers in the inode structure.
1353 */
1354
1355 if (!high_sierra) {
1356 parse_rock_ridge_inode(de, inode);
1357 /* if we want uid/gid set, override the rock ridge setting */
1358 if (sbi->s_uid_set)
1359 inode->i_uid = sbi->s_uid;
1360 if (sbi->s_gid_set)
1361 inode->i_gid = sbi->s_gid;
1362 }
1363 /* Now set final access rights if overriding rock ridge setting */
1364 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1365 sbi->s_dmode != ISOFS_INVALID_MODE)
1366 inode->i_mode = S_IFDIR | sbi->s_dmode;
1367 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1368 sbi->s_fmode != ISOFS_INVALID_MODE)
1369 inode->i_mode = S_IFREG | sbi->s_fmode;
1370
1371 /* Install the inode operations vector */
1372 if (S_ISREG(inode->i_mode)) {
1373 inode->i_fop = &generic_ro_fops;
1374 switch (ei->i_file_format) {
1375 #ifdef CONFIG_ZISOFS
1376 case isofs_file_compressed:
1377 inode->i_data.a_ops = &zisofs_aops;
1378 break;
1379 #endif
1380 default:
1381 inode->i_data.a_ops = &isofs_aops;
1382 break;
1383 }
1384 } else if (S_ISDIR(inode->i_mode)) {
1385 inode->i_op = &isofs_dir_inode_operations;
1386 inode->i_fop = &isofs_dir_operations;
1387 } else if (S_ISLNK(inode->i_mode)) {
1388 inode->i_op = &page_symlink_inode_operations;
1389 inode->i_data.a_ops = &isofs_symlink_aops;
1390 } else
1391 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1392 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1393
1394 ret = 0;
1395 out:
1396 kfree(tmpde);
1397 if (bh)
1398 brelse(bh);
1399 return ret;
1400
1401 out_badread:
1402 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1403 fail:
1404 goto out;
1405 }
1406
1407 struct isofs_iget5_callback_data {
1408 unsigned long block;
1409 unsigned long offset;
1410 };
1411
1412 static int isofs_iget5_test(struct inode *ino, void *data)
1413 {
1414 struct iso_inode_info *i = ISOFS_I(ino);
1415 struct isofs_iget5_callback_data *d =
1416 (struct isofs_iget5_callback_data*)data;
1417 return (i->i_iget5_block == d->block)
1418 && (i->i_iget5_offset == d->offset);
1419 }
1420
1421 static int isofs_iget5_set(struct inode *ino, void *data)
1422 {
1423 struct iso_inode_info *i = ISOFS_I(ino);
1424 struct isofs_iget5_callback_data *d =
1425 (struct isofs_iget5_callback_data*)data;
1426 i->i_iget5_block = d->block;
1427 i->i_iget5_offset = d->offset;
1428 return 0;
1429 }
1430
1431 /* Store, in the inode's containing structure, the block and block
1432 * offset that point to the underlying meta-data for the inode. The
1433 * code below is otherwise similar to the iget() code in
1434 * include/linux/fs.h */
1435 struct inode *isofs_iget(struct super_block *sb,
1436 unsigned long block,
1437 unsigned long offset)
1438 {
1439 unsigned long hashval;
1440 struct inode *inode;
1441 struct isofs_iget5_callback_data data;
1442 long ret;
1443
1444 if (offset >= 1ul << sb->s_blocksize_bits)
1445 return ERR_PTR(-EINVAL);
1446
1447 data.block = block;
1448 data.offset = offset;
1449
1450 hashval = (block << sb->s_blocksize_bits) | offset;
1451
1452 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1453 &isofs_iget5_set, &data);
1454
1455 if (!inode)
1456 return ERR_PTR(-ENOMEM);
1457
1458 if (inode->i_state & I_NEW) {
1459 ret = isofs_read_inode(inode);
1460 if (ret < 0) {
1461 iget_failed(inode);
1462 inode = ERR_PTR(ret);
1463 } else {
1464 unlock_new_inode(inode);
1465 }
1466 }
1467
1468 return inode;
1469 }
1470
1471 static int isofs_get_sb(struct file_system_type *fs_type,
1472 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1473 {
1474 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1475 mnt);
1476 }
1477
1478 static struct file_system_type iso9660_fs_type = {
1479 .owner = THIS_MODULE,
1480 .name = "iso9660",
1481 .get_sb = isofs_get_sb,
1482 .kill_sb = kill_block_super,
1483 .fs_flags = FS_REQUIRES_DEV,
1484 };
1485
1486 static int __init init_iso9660_fs(void)
1487 {
1488 int err = init_inodecache();
1489 if (err)
1490 goto out;
1491 #ifdef CONFIG_ZISOFS
1492 err = zisofs_init();
1493 if (err)
1494 goto out1;
1495 #endif
1496 err = register_filesystem(&iso9660_fs_type);
1497 if (err)
1498 goto out2;
1499 return 0;
1500 out2:
1501 #ifdef CONFIG_ZISOFS
1502 zisofs_cleanup();
1503 out1:
1504 #endif
1505 destroy_inodecache();
1506 out:
1507 return err;
1508 }
1509
1510 static void __exit exit_iso9660_fs(void)
1511 {
1512 unregister_filesystem(&iso9660_fs_type);
1513 #ifdef CONFIG_ZISOFS
1514 zisofs_cleanup();
1515 #endif
1516 destroy_inodecache();
1517 }
1518
1519 module_init(init_iso9660_fs)
1520 module_exit(exit_iso9660_fs)
1521 MODULE_LICENSE("GPL");
1522 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1523 MODULE_ALIAS("iso9660");
linux-next