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Merge branch 'intel_idle+snb' into idle-release
[mirror_ubuntu-bionic-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
46 #ifdef CONFIG_JOLIET
47 lock_kernel();
48
49 unload_nls(sbi->s_nls_iocharset);
50
51 unlock_kernel();
52 #endif
53
54 kfree(sbi);
55 sb->s_fs_info = NULL;
56 return;
57 }
58
59 static int isofs_read_inode(struct inode *);
60 static int isofs_statfs (struct dentry *, struct kstatfs *);
61
62 static struct kmem_cache *isofs_inode_cachep;
63
64 static struct inode *isofs_alloc_inode(struct super_block *sb)
65 {
66 struct iso_inode_info *ei;
67 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
68 if (!ei)
69 return NULL;
70 return &ei->vfs_inode;
71 }
72
73 static void isofs_destroy_inode(struct inode *inode)
74 {
75 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
76 }
77
78 static void init_once(void *foo)
79 {
80 struct iso_inode_info *ei = foo;
81
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);
92 if (isofs_inode_cachep == NULL)
93 return -ENOMEM;
94 return 0;
95 }
96
97 static void destroy_inodecache(void)
98 {
99 kmem_cache_destroy(isofs_inode_cachep);
100 }
101
102 static int isofs_remount(struct super_block *sb, int *flags, char *data)
103 {
104 /* we probably want a lot more here */
105 *flags |= MS_RDONLY;
106 return 0;
107 }
108
109 static const struct super_operations isofs_sops = {
110 .alloc_inode = isofs_alloc_inode,
111 .destroy_inode = isofs_destroy_inode,
112 .put_super = isofs_put_super,
113 .statfs = isofs_statfs,
114 .remount_fs = isofs_remount,
115 .show_options = generic_show_options,
116 };
117
118
119 static const struct dentry_operations isofs_dentry_ops[] = {
120 {
121 .d_hash = isofs_hash,
122 .d_compare = isofs_dentry_cmp,
123 },
124 {
125 .d_hash = isofs_hashi,
126 .d_compare = isofs_dentry_cmpi,
127 },
128 #ifdef CONFIG_JOLIET
129 {
130 .d_hash = isofs_hash_ms,
131 .d_compare = isofs_dentry_cmp_ms,
132 },
133 {
134 .d_hash = isofs_hashi_ms,
135 .d_compare = isofs_dentry_cmpi_ms,
136 },
137 #endif
138 };
139
140 struct iso9660_options{
141 unsigned int rock:1;
142 unsigned int joliet:1;
143 unsigned int cruft:1;
144 unsigned int hide:1;
145 unsigned int showassoc:1;
146 unsigned int nocompress:1;
147 unsigned int overriderockperm:1;
148 unsigned int uid_set:1;
149 unsigned int gid_set:1;
150 unsigned int utf8:1;
151 unsigned char map;
152 unsigned char check;
153 unsigned int blocksize;
154 mode_t fmode;
155 mode_t dmode;
156 gid_t gid;
157 uid_t uid;
158 char *iocharset;
159 /* LVE */
160 s32 session;
161 s32 sbsector;
162 };
163
164 /*
165 * Compute the hash for the isofs name corresponding to the dentry.
166 */
167 static int
168 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
169 {
170 const char *name;
171 int len;
172
173 len = qstr->len;
174 name = qstr->name;
175 if (ms) {
176 while (len && name[len-1] == '.')
177 len--;
178 }
179
180 qstr->hash = full_name_hash(name, len);
181
182 return 0;
183 }
184
185 /*
186 * Compute the hash for the isofs name corresponding to the dentry.
187 */
188 static int
189 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
190 {
191 const char *name;
192 int len;
193 char c;
194 unsigned long hash;
195
196 len = qstr->len;
197 name = qstr->name;
198 if (ms) {
199 while (len && name[len-1] == '.')
200 len--;
201 }
202
203 hash = init_name_hash();
204 while (len--) {
205 c = tolower(*name++);
206 hash = partial_name_hash(c, hash);
207 }
208 qstr->hash = end_name_hash(hash);
209
210 return 0;
211 }
212
213 /*
214 * Case insensitive compare of two isofs names.
215 */
216 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
217 struct qstr *b, int ms)
218 {
219 int alen, blen;
220
221 /* A filename cannot end in '.' or we treat it like it has none */
222 alen = a->len;
223 blen = b->len;
224 if (ms) {
225 while (alen && a->name[alen-1] == '.')
226 alen--;
227 while (blen && b->name[blen-1] == '.')
228 blen--;
229 }
230 if (alen == blen) {
231 if (strnicmp(a->name, b->name, alen) == 0)
232 return 0;
233 }
234 return 1;
235 }
236
237 /*
238 * Case sensitive compare of two isofs names.
239 */
240 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
241 struct qstr *b, int ms)
242 {
243 int alen, blen;
244
245 /* A filename cannot end in '.' or we treat it like it has none */
246 alen = a->len;
247 blen = b->len;
248 if (ms) {
249 while (alen && a->name[alen-1] == '.')
250 alen--;
251 while (blen && b->name[blen-1] == '.')
252 blen--;
253 }
254 if (alen == blen) {
255 if (strncmp(a->name, b->name, alen) == 0)
256 return 0;
257 }
258 return 1;
259 }
260
261 static int
262 isofs_hash(struct dentry *dentry, struct qstr *qstr)
263 {
264 return isofs_hash_common(dentry, qstr, 0);
265 }
266
267 static int
268 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
269 {
270 return isofs_hashi_common(dentry, qstr, 0);
271 }
272
273 static int
274 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
275 {
276 return isofs_dentry_cmp_common(dentry, a, b, 0);
277 }
278
279 static int
280 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
281 {
282 return isofs_dentry_cmpi_common(dentry, a, b, 0);
283 }
284
285 #ifdef CONFIG_JOLIET
286 static int
287 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
288 {
289 return isofs_hash_common(dentry, qstr, 1);
290 }
291
292 static int
293 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
294 {
295 return isofs_hashi_common(dentry, qstr, 1);
296 }
297
298 static int
299 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
300 {
301 return isofs_dentry_cmp_common(dentry, a, b, 1);
302 }
303
304 static int
305 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
306 {
307 return isofs_dentry_cmpi_common(dentry, a, b, 1);
308 }
309 #endif
310
311 enum {
312 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
313 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
314 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
315 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
316 };
317
318 static const match_table_t tokens = {
319 {Opt_norock, "norock"},
320 {Opt_nojoliet, "nojoliet"},
321 {Opt_unhide, "unhide"},
322 {Opt_hide, "hide"},
323 {Opt_showassoc, "showassoc"},
324 {Opt_cruft, "cruft"},
325 {Opt_utf8, "utf8"},
326 {Opt_iocharset, "iocharset=%s"},
327 {Opt_map_a, "map=acorn"},
328 {Opt_map_a, "map=a"},
329 {Opt_map_n, "map=normal"},
330 {Opt_map_n, "map=n"},
331 {Opt_map_o, "map=off"},
332 {Opt_map_o, "map=o"},
333 {Opt_session, "session=%u"},
334 {Opt_sb, "sbsector=%u"},
335 {Opt_check_r, "check=relaxed"},
336 {Opt_check_r, "check=r"},
337 {Opt_check_s, "check=strict"},
338 {Opt_check_s, "check=s"},
339 {Opt_uid, "uid=%u"},
340 {Opt_gid, "gid=%u"},
341 {Opt_mode, "mode=%u"},
342 {Opt_dmode, "dmode=%u"},
343 {Opt_overriderockperm, "overriderockperm"},
344 {Opt_block, "block=%u"},
345 {Opt_ignore, "conv=binary"},
346 {Opt_ignore, "conv=b"},
347 {Opt_ignore, "conv=text"},
348 {Opt_ignore, "conv=t"},
349 {Opt_ignore, "conv=mtext"},
350 {Opt_ignore, "conv=m"},
351 {Opt_ignore, "conv=auto"},
352 {Opt_ignore, "conv=a"},
353 {Opt_nocompress, "nocompress"},
354 {Opt_err, NULL}
355 };
356
357 static int parse_options(char *options, struct iso9660_options *popt)
358 {
359 char *p;
360 int option;
361
362 popt->map = 'n';
363 popt->rock = 1;
364 popt->joliet = 1;
365 popt->cruft = 0;
366 popt->hide = 0;
367 popt->showassoc = 0;
368 popt->check = 'u'; /* unset */
369 popt->nocompress = 0;
370 popt->blocksize = 1024;
371 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
372 popt->uid_set = 0;
373 popt->gid_set = 0;
374 popt->gid = 0;
375 popt->uid = 0;
376 popt->iocharset = NULL;
377 popt->utf8 = 0;
378 popt->overriderockperm = 0;
379 popt->session=-1;
380 popt->sbsector=-1;
381 if (!options)
382 return 1;
383
384 while ((p = strsep(&options, ",")) != NULL) {
385 int token;
386 substring_t args[MAX_OPT_ARGS];
387 unsigned n;
388
389 if (!*p)
390 continue;
391
392 token = match_token(p, tokens, args);
393 switch (token) {
394 case Opt_norock:
395 popt->rock = 0;
396 break;
397 case Opt_nojoliet:
398 popt->joliet = 0;
399 break;
400 case Opt_hide:
401 popt->hide = 1;
402 break;
403 case Opt_unhide:
404 case Opt_showassoc:
405 popt->showassoc = 1;
406 break;
407 case Opt_cruft:
408 popt->cruft = 1;
409 break;
410 case Opt_utf8:
411 popt->utf8 = 1;
412 break;
413 #ifdef CONFIG_JOLIET
414 case Opt_iocharset:
415 popt->iocharset = match_strdup(&args[0]);
416 break;
417 #endif
418 case Opt_map_a:
419 popt->map = 'a';
420 break;
421 case Opt_map_o:
422 popt->map = 'o';
423 break;
424 case Opt_map_n:
425 popt->map = 'n';
426 break;
427 case Opt_session:
428 if (match_int(&args[0], &option))
429 return 0;
430 n = option;
431 if (n > 99)
432 return 0;
433 popt->session = n + 1;
434 break;
435 case Opt_sb:
436 if (match_int(&args[0], &option))
437 return 0;
438 popt->sbsector = option;
439 break;
440 case Opt_check_r:
441 popt->check = 'r';
442 break;
443 case Opt_check_s:
444 popt->check = 's';
445 break;
446 case Opt_ignore:
447 break;
448 case Opt_uid:
449 if (match_int(&args[0], &option))
450 return 0;
451 popt->uid = option;
452 popt->uid_set = 1;
453 break;
454 case Opt_gid:
455 if (match_int(&args[0], &option))
456 return 0;
457 popt->gid = option;
458 popt->gid_set = 1;
459 break;
460 case Opt_mode:
461 if (match_int(&args[0], &option))
462 return 0;
463 popt->fmode = option;
464 break;
465 case Opt_dmode:
466 if (match_int(&args[0], &option))
467 return 0;
468 popt->dmode = option;
469 break;
470 case Opt_overriderockperm:
471 popt->overriderockperm = 1;
472 break;
473 case Opt_block:
474 if (match_int(&args[0], &option))
475 return 0;
476 n = option;
477 if (n != 512 && n != 1024 && n != 2048)
478 return 0;
479 popt->blocksize = n;
480 break;
481 case Opt_nocompress:
482 popt->nocompress = 1;
483 break;
484 default:
485 return 0;
486 }
487 }
488 return 1;
489 }
490
491 /*
492 * look if the driver can tell the multi session redirection value
493 *
494 * don't change this if you don't know what you do, please!
495 * Multisession is legal only with XA disks.
496 * A non-XA disk with more than one volume descriptor may do it right, but
497 * usually is written in a nowhere standardized "multi-partition" manner.
498 * Multisession uses absolute addressing (solely the first frame of the whole
499 * track is #0), multi-partition uses relative addressing (each first frame of
500 * each track is #0), and a track is not a session.
501 *
502 * A broken CDwriter software or drive firmware does not set new standards,
503 * at least not if conflicting with the existing ones.
504 *
505 * emoenke@gwdg.de
506 */
507 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
508
509 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
510 {
511 struct cdrom_multisession ms_info;
512 unsigned int vol_desc_start;
513 struct block_device *bdev = sb->s_bdev;
514 int i;
515
516 vol_desc_start=0;
517 ms_info.addr_format=CDROM_LBA;
518 if(session >= 0 && session <= 99) {
519 struct cdrom_tocentry Te;
520 Te.cdte_track=session;
521 Te.cdte_format=CDROM_LBA;
522 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
523 if (!i) {
524 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
525 session, Te.cdte_addr.lba,
526 Te.cdte_ctrl&CDROM_DATA_TRACK);
527 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
528 return Te.cdte_addr.lba;
529 }
530
531 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
532 }
533 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
534 if (session > 0)
535 printk(KERN_ERR "ISOFS: Invalid session number\n");
536 #if 0
537 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
538 if (i==0) {
539 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
540 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
541 }
542 #endif
543 if (i==0)
544 #if WE_OBEY_THE_WRITTEN_STANDARDS
545 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
546 #endif
547 vol_desc_start=ms_info.addr.lba;
548 return vol_desc_start;
549 }
550
551 /*
552 * Initialize the superblock and read the root inode.
553 *
554 * Note: a check_disk_change() has been done immediately prior
555 * to this call, so we don't need to check again.
556 */
557 static int isofs_fill_super(struct super_block *s, void *data, int silent)
558 {
559 struct buffer_head *bh = NULL, *pri_bh = NULL;
560 struct hs_primary_descriptor *h_pri = NULL;
561 struct iso_primary_descriptor *pri = NULL;
562 struct iso_supplementary_descriptor *sec = NULL;
563 struct iso_directory_record *rootp;
564 struct inode *inode;
565 struct iso9660_options opt;
566 struct isofs_sb_info *sbi;
567 unsigned long first_data_zone;
568 int joliet_level = 0;
569 int iso_blknum, block;
570 int orig_zonesize;
571 int table, error = -EINVAL;
572 unsigned int vol_desc_start;
573
574 save_mount_options(s, data);
575
576 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
577 if (!sbi)
578 return -ENOMEM;
579 s->s_fs_info = sbi;
580
581 if (!parse_options((char *)data, &opt))
582 goto out_freesbi;
583
584 /*
585 * First of all, get the hardware blocksize for this device.
586 * If we don't know what it is, or the hardware blocksize is
587 * larger than the blocksize the user specified, then use
588 * that value.
589 */
590 /*
591 * What if bugger tells us to go beyond page size?
592 */
593 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
594
595 sbi->s_high_sierra = 0; /* default is iso9660 */
596
597 vol_desc_start = (opt.sbsector != -1) ?
598 opt.sbsector : isofs_get_last_session(s,opt.session);
599
600 for (iso_blknum = vol_desc_start+16;
601 iso_blknum < vol_desc_start+100; iso_blknum++) {
602 struct hs_volume_descriptor *hdp;
603 struct iso_volume_descriptor *vdp;
604
605 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
606 if (!(bh = sb_bread(s, block)))
607 goto out_no_read;
608
609 vdp = (struct iso_volume_descriptor *)bh->b_data;
610 hdp = (struct hs_volume_descriptor *)bh->b_data;
611
612 /*
613 * Due to the overlapping physical location of the descriptors,
614 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
615 * proper identification in this case, we first check for ISO.
616 */
617 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
618 if (isonum_711(vdp->type) == ISO_VD_END)
619 break;
620 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
621 if (pri == NULL) {
622 pri = (struct iso_primary_descriptor *)vdp;
623 /* Save the buffer in case we need it ... */
624 pri_bh = bh;
625 bh = NULL;
626 }
627 }
628 #ifdef CONFIG_JOLIET
629 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
630 sec = (struct iso_supplementary_descriptor *)vdp;
631 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
632 if (opt.joliet) {
633 if (sec->escape[2] == 0x40)
634 joliet_level = 1;
635 else if (sec->escape[2] == 0x43)
636 joliet_level = 2;
637 else if (sec->escape[2] == 0x45)
638 joliet_level = 3;
639
640 printk(KERN_DEBUG "ISO 9660 Extensions: "
641 "Microsoft Joliet Level %d\n",
642 joliet_level);
643 }
644 goto root_found;
645 } else {
646 /* Unknown supplementary volume descriptor */
647 sec = NULL;
648 }
649 }
650 #endif
651 } else {
652 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
653 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
654 goto out_freebh;
655
656 sbi->s_high_sierra = 1;
657 opt.rock = 0;
658 h_pri = (struct hs_primary_descriptor *)vdp;
659 goto root_found;
660 }
661 }
662
663 /* Just skip any volume descriptors we don't recognize */
664
665 brelse(bh);
666 bh = NULL;
667 }
668 /*
669 * If we fall through, either no volume descriptor was found,
670 * or else we passed a primary descriptor looking for others.
671 */
672 if (!pri)
673 goto out_unknown_format;
674 brelse(bh);
675 bh = pri_bh;
676 pri_bh = NULL;
677
678 root_found:
679
680 if (joliet_level && (pri == NULL || !opt.rock)) {
681 /* This is the case of Joliet with the norock mount flag.
682 * A disc with both Joliet and Rock Ridge is handled later
683 */
684 pri = (struct iso_primary_descriptor *) sec;
685 }
686
687 if(sbi->s_high_sierra){
688 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
689 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
690 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
691 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
692 } else {
693 if (!pri)
694 goto out_freebh;
695 rootp = (struct iso_directory_record *) pri->root_directory_record;
696 sbi->s_nzones = isonum_733(pri->volume_space_size);
697 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
698 sbi->s_max_size = isonum_733(pri->volume_space_size);
699 }
700
701 sbi->s_ninodes = 0; /* No way to figure this out easily */
702
703 orig_zonesize = sbi->s_log_zone_size;
704 /*
705 * If the zone size is smaller than the hardware sector size,
706 * this is a fatal error. This would occur if the disc drive
707 * had sectors that were 2048 bytes, but the filesystem had
708 * blocks that were 512 bytes (which should only very rarely
709 * happen.)
710 */
711 if (orig_zonesize < opt.blocksize)
712 goto out_bad_size;
713
714 /* RDE: convert log zone size to bit shift */
715 switch (sbi->s_log_zone_size) {
716 case 512: sbi->s_log_zone_size = 9; break;
717 case 1024: sbi->s_log_zone_size = 10; break;
718 case 2048: sbi->s_log_zone_size = 11; break;
719
720 default:
721 goto out_bad_zone_size;
722 }
723
724 s->s_magic = ISOFS_SUPER_MAGIC;
725
726 /*
727 * With multi-extent files, file size is only limited by the maximum
728 * size of a file system, which is 8 TB.
729 */
730 s->s_maxbytes = 0x80000000000LL;
731
732 /*
733 * The CDROM is read-only, has no nodes (devices) on it, and since
734 * all of the files appear to be owned by root, we really do not want
735 * to allow suid. (suid or devices will not show up unless we have
736 * Rock Ridge extensions)
737 */
738
739 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
740
741 /* Set this for reference. Its not currently used except on write
742 which we don't have .. */
743
744 first_data_zone = isonum_733(rootp->extent) +
745 isonum_711(rootp->ext_attr_length);
746 sbi->s_firstdatazone = first_data_zone;
747 #ifndef BEQUIET
748 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
749 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
750 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
751 if(sbi->s_high_sierra)
752 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
753 #endif
754
755 /*
756 * If the Joliet level is set, we _may_ decide to use the
757 * secondary descriptor, but can't be sure until after we
758 * read the root inode. But before reading the root inode
759 * we may need to change the device blocksize, and would
760 * rather release the old buffer first. So, we cache the
761 * first_data_zone value from the secondary descriptor.
762 */
763 if (joliet_level) {
764 pri = (struct iso_primary_descriptor *) sec;
765 rootp = (struct iso_directory_record *)
766 pri->root_directory_record;
767 first_data_zone = isonum_733(rootp->extent) +
768 isonum_711(rootp->ext_attr_length);
769 }
770
771 /*
772 * We're all done using the volume descriptor, and may need
773 * to change the device blocksize, so release the buffer now.
774 */
775 brelse(pri_bh);
776 brelse(bh);
777
778 /*
779 * Force the blocksize to 512 for 512 byte sectors. The file
780 * read primitives really get it wrong in a bad way if we don't
781 * do this.
782 *
783 * Note - we should never be setting the blocksize to something
784 * less than the hardware sector size for the device. If we
785 * do, we would end up having to read larger buffers and split
786 * out portions to satisfy requests.
787 *
788 * Note2- the idea here is that we want to deal with the optimal
789 * zonesize in the filesystem. If we have it set to something less,
790 * then we have horrible problems with trying to piece together
791 * bits of adjacent blocks in order to properly read directory
792 * entries. By forcing the blocksize in this way, we ensure
793 * that we will never be required to do this.
794 */
795 sb_set_blocksize(s, orig_zonesize);
796
797 sbi->s_nls_iocharset = NULL;
798
799 #ifdef CONFIG_JOLIET
800 if (joliet_level && opt.utf8 == 0) {
801 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
802 sbi->s_nls_iocharset = load_nls(p);
803 if (! sbi->s_nls_iocharset) {
804 /* Fail only if explicit charset specified */
805 if (opt.iocharset)
806 goto out_freesbi;
807 sbi->s_nls_iocharset = load_nls_default();
808 }
809 }
810 #endif
811 s->s_op = &isofs_sops;
812 s->s_export_op = &isofs_export_ops;
813 sbi->s_mapping = opt.map;
814 sbi->s_rock = (opt.rock ? 2 : 0);
815 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
816 sbi->s_cruft = opt.cruft;
817 sbi->s_hide = opt.hide;
818 sbi->s_showassoc = opt.showassoc;
819 sbi->s_uid = opt.uid;
820 sbi->s_gid = opt.gid;
821 sbi->s_uid_set = opt.uid_set;
822 sbi->s_gid_set = opt.gid_set;
823 sbi->s_utf8 = opt.utf8;
824 sbi->s_nocompress = opt.nocompress;
825 sbi->s_overriderockperm = opt.overriderockperm;
826 /*
827 * It would be incredibly stupid to allow people to mark every file
828 * on the disk as suid, so we merely allow them to set the default
829 * permissions.
830 */
831 if (opt.fmode != ISOFS_INVALID_MODE)
832 sbi->s_fmode = opt.fmode & 0777;
833 else
834 sbi->s_fmode = ISOFS_INVALID_MODE;
835 if (opt.dmode != ISOFS_INVALID_MODE)
836 sbi->s_dmode = opt.dmode & 0777;
837 else
838 sbi->s_dmode = ISOFS_INVALID_MODE;
839
840 /*
841 * Read the root inode, which _may_ result in changing
842 * the s_rock flag. Once we have the final s_rock value,
843 * we then decide whether to use the Joliet descriptor.
844 */
845 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
846 if (IS_ERR(inode))
847 goto out_no_root;
848
849 /*
850 * If this disk has both Rock Ridge and Joliet on it, then we
851 * want to use Rock Ridge by default. This can be overridden
852 * by using the norock mount option. There is still one other
853 * possibility that is not taken into account: a Rock Ridge
854 * CD with Unicode names. Until someone sees such a beast, it
855 * will not be supported.
856 */
857 if (sbi->s_rock == 1) {
858 joliet_level = 0;
859 } else if (joliet_level) {
860 sbi->s_rock = 0;
861 if (sbi->s_firstdatazone != first_data_zone) {
862 sbi->s_firstdatazone = first_data_zone;
863 printk(KERN_DEBUG
864 "ISOFS: changing to secondary root\n");
865 iput(inode);
866 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
867 if (IS_ERR(inode))
868 goto out_no_root;
869 }
870 }
871
872 if (opt.check == 'u') {
873 /* Only Joliet is case insensitive by default */
874 if (joliet_level)
875 opt.check = 'r';
876 else
877 opt.check = 's';
878 }
879 sbi->s_joliet_level = joliet_level;
880
881 /* Make sure the root inode is a directory */
882 if (!S_ISDIR(inode->i_mode)) {
883 printk(KERN_WARNING
884 "isofs_fill_super: root inode is not a directory. "
885 "Corrupted media?\n");
886 goto out_iput;
887 }
888
889 /* get the root dentry */
890 s->s_root = d_alloc_root(inode);
891 if (!(s->s_root))
892 goto out_no_root;
893
894 table = 0;
895 if (joliet_level)
896 table += 2;
897 if (opt.check == 'r')
898 table++;
899 s->s_root->d_op = &isofs_dentry_ops[table];
900
901 kfree(opt.iocharset);
902
903 return 0;
904
905 /*
906 * Display error messages and free resources.
907 */
908 out_iput:
909 iput(inode);
910 goto out_no_inode;
911 out_no_root:
912 error = PTR_ERR(inode);
913 if (error != -ENOMEM)
914 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
915 out_no_inode:
916 #ifdef CONFIG_JOLIET
917 unload_nls(sbi->s_nls_iocharset);
918 #endif
919 goto out_freesbi;
920 out_no_read:
921 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
922 __func__, s->s_id, iso_blknum, block);
923 goto out_freesbi;
924 out_bad_zone_size:
925 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
926 sbi->s_log_zone_size);
927 goto out_freebh;
928 out_bad_size:
929 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
930 orig_zonesize, opt.blocksize);
931 goto out_freebh;
932 out_unknown_format:
933 if (!silent)
934 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
935
936 out_freebh:
937 brelse(bh);
938 out_freesbi:
939 kfree(opt.iocharset);
940 kfree(sbi);
941 s->s_fs_info = NULL;
942 return error;
943 }
944
945 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
946 {
947 struct super_block *sb = dentry->d_sb;
948 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
949
950 buf->f_type = ISOFS_SUPER_MAGIC;
951 buf->f_bsize = sb->s_blocksize;
952 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
953 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
954 buf->f_bfree = 0;
955 buf->f_bavail = 0;
956 buf->f_files = ISOFS_SB(sb)->s_ninodes;
957 buf->f_ffree = 0;
958 buf->f_fsid.val[0] = (u32)id;
959 buf->f_fsid.val[1] = (u32)(id >> 32);
960 buf->f_namelen = NAME_MAX;
961 return 0;
962 }
963
964 /*
965 * Get a set of blocks; filling in buffer_heads if already allocated
966 * or getblk() if they are not. Returns the number of blocks inserted
967 * (-ve == error.)
968 */
969 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
970 struct buffer_head **bh, unsigned long nblocks)
971 {
972 unsigned long b_off;
973 unsigned offset, sect_size;
974 unsigned int firstext;
975 unsigned long nextblk, nextoff;
976 long iblock = (long)iblock_s;
977 int section, rv, error;
978 struct iso_inode_info *ei = ISOFS_I(inode);
979
980 lock_kernel();
981
982 error = -EIO;
983 rv = 0;
984 if (iblock < 0 || iblock != iblock_s) {
985 printk(KERN_DEBUG "%s: block number too large\n", __func__);
986 goto abort;
987 }
988
989 b_off = iblock;
990
991 offset = 0;
992 firstext = ei->i_first_extent;
993 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
994 nextblk = ei->i_next_section_block;
995 nextoff = ei->i_next_section_offset;
996 section = 0;
997
998 while (nblocks) {
999 /* If we are *way* beyond the end of the file, print a message.
1000 * Access beyond the end of the file up to the next page boundary
1001 * is normal, however because of the way the page cache works.
1002 * In this case, we just return 0 so that we can properly fill
1003 * the page with useless information without generating any
1004 * I/O errors.
1005 */
1006 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1007 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
1008 __func__, iblock, (unsigned long) inode->i_size);
1009 goto abort;
1010 }
1011
1012 /* On the last section, nextblk == 0, section size is likely to
1013 * exceed sect_size by a partial block, and access beyond the
1014 * end of the file will reach beyond the section size, too.
1015 */
1016 while (nextblk && (b_off >= (offset + sect_size))) {
1017 struct inode *ninode;
1018
1019 offset += sect_size;
1020 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1021 if (IS_ERR(ninode)) {
1022 error = PTR_ERR(ninode);
1023 goto abort;
1024 }
1025 firstext = ISOFS_I(ninode)->i_first_extent;
1026 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1027 nextblk = ISOFS_I(ninode)->i_next_section_block;
1028 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1029 iput(ninode);
1030
1031 if (++section > 100) {
1032 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1033 " aborting...\n", __func__);
1034 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1035 "nextblk=%lu nextoff=%lu\n", __func__,
1036 iblock, firstext, (unsigned) sect_size,
1037 nextblk, nextoff);
1038 goto abort;
1039 }
1040 }
1041
1042 if (*bh) {
1043 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1044 } else {
1045 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1046 if (!*bh)
1047 goto abort;
1048 }
1049 bh++; /* Next buffer head */
1050 b_off++; /* Next buffer offset */
1051 nblocks--;
1052 rv++;
1053 }
1054
1055 error = 0;
1056 abort:
1057 unlock_kernel();
1058 return rv != 0 ? rv : error;
1059 }
1060
1061 /*
1062 * Used by the standard interfaces.
1063 */
1064 static int isofs_get_block(struct inode *inode, sector_t iblock,
1065 struct buffer_head *bh_result, int create)
1066 {
1067 int ret;
1068
1069 if (create) {
1070 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1071 return -EROFS;
1072 }
1073
1074 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1075 return ret < 0 ? ret : 0;
1076 }
1077
1078 static int isofs_bmap(struct inode *inode, sector_t block)
1079 {
1080 struct buffer_head dummy;
1081 int error;
1082
1083 dummy.b_state = 0;
1084 dummy.b_blocknr = -1000;
1085 error = isofs_get_block(inode, block, &dummy, 0);
1086 if (!error)
1087 return dummy.b_blocknr;
1088 return 0;
1089 }
1090
1091 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1092 {
1093 sector_t blknr = isofs_bmap(inode, block);
1094 if (!blknr)
1095 return NULL;
1096 return sb_bread(inode->i_sb, blknr);
1097 }
1098
1099 static int isofs_readpage(struct file *file, struct page *page)
1100 {
1101 return block_read_full_page(page,isofs_get_block);
1102 }
1103
1104 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1105 {
1106 return generic_block_bmap(mapping,block,isofs_get_block);
1107 }
1108
1109 static const struct address_space_operations isofs_aops = {
1110 .readpage = isofs_readpage,
1111 .sync_page = block_sync_page,
1112 .bmap = _isofs_bmap
1113 };
1114
1115 static int isofs_read_level3_size(struct inode *inode)
1116 {
1117 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1118 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1119 struct buffer_head *bh = NULL;
1120 unsigned long block, offset, block_saved, offset_saved;
1121 int i = 0;
1122 int more_entries = 0;
1123 struct iso_directory_record *tmpde = NULL;
1124 struct iso_inode_info *ei = ISOFS_I(inode);
1125
1126 inode->i_size = 0;
1127
1128 /* The first 16 blocks are reserved as the System Area. Thus,
1129 * no inodes can appear in block 0. We use this to flag that
1130 * this is the last section. */
1131 ei->i_next_section_block = 0;
1132 ei->i_next_section_offset = 0;
1133
1134 block = ei->i_iget5_block;
1135 offset = ei->i_iget5_offset;
1136
1137 do {
1138 struct iso_directory_record *de;
1139 unsigned int de_len;
1140
1141 if (!bh) {
1142 bh = sb_bread(inode->i_sb, block);
1143 if (!bh)
1144 goto out_noread;
1145 }
1146 de = (struct iso_directory_record *) (bh->b_data + offset);
1147 de_len = *(unsigned char *) de;
1148
1149 if (de_len == 0) {
1150 brelse(bh);
1151 bh = NULL;
1152 ++block;
1153 offset = 0;
1154 continue;
1155 }
1156
1157 block_saved = block;
1158 offset_saved = offset;
1159 offset += de_len;
1160
1161 /* Make sure we have a full directory entry */
1162 if (offset >= bufsize) {
1163 int slop = bufsize - offset + de_len;
1164 if (!tmpde) {
1165 tmpde = kmalloc(256, GFP_KERNEL);
1166 if (!tmpde)
1167 goto out_nomem;
1168 }
1169 memcpy(tmpde, de, slop);
1170 offset &= bufsize - 1;
1171 block++;
1172 brelse(bh);
1173 bh = NULL;
1174 if (offset) {
1175 bh = sb_bread(inode->i_sb, block);
1176 if (!bh)
1177 goto out_noread;
1178 memcpy((void *)tmpde+slop, bh->b_data, offset);
1179 }
1180 de = tmpde;
1181 }
1182
1183 inode->i_size += isonum_733(de->size);
1184 if (i == 1) {
1185 ei->i_next_section_block = block_saved;
1186 ei->i_next_section_offset = offset_saved;
1187 }
1188
1189 more_entries = de->flags[-high_sierra] & 0x80;
1190
1191 i++;
1192 if (i > 100)
1193 goto out_toomany;
1194 } while (more_entries);
1195 out:
1196 kfree(tmpde);
1197 if (bh)
1198 brelse(bh);
1199 return 0;
1200
1201 out_nomem:
1202 if (bh)
1203 brelse(bh);
1204 return -ENOMEM;
1205
1206 out_noread:
1207 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1208 kfree(tmpde);
1209 return -EIO;
1210
1211 out_toomany:
1212 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1213 "isofs_read_level3_size: inode=%lu\n",
1214 __func__, inode->i_ino);
1215 goto out;
1216 }
1217
1218 static int isofs_read_inode(struct inode *inode)
1219 {
1220 struct super_block *sb = inode->i_sb;
1221 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1222 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1223 unsigned long block;
1224 int high_sierra = sbi->s_high_sierra;
1225 struct buffer_head *bh = NULL;
1226 struct iso_directory_record *de;
1227 struct iso_directory_record *tmpde = NULL;
1228 unsigned int de_len;
1229 unsigned long offset;
1230 struct iso_inode_info *ei = ISOFS_I(inode);
1231 int ret = -EIO;
1232
1233 block = ei->i_iget5_block;
1234 bh = sb_bread(inode->i_sb, block);
1235 if (!bh)
1236 goto out_badread;
1237
1238 offset = ei->i_iget5_offset;
1239
1240 de = (struct iso_directory_record *) (bh->b_data + offset);
1241 de_len = *(unsigned char *) de;
1242
1243 if (offset + de_len > bufsize) {
1244 int frag1 = bufsize - offset;
1245
1246 tmpde = kmalloc(de_len, GFP_KERNEL);
1247 if (tmpde == NULL) {
1248 printk(KERN_INFO "%s: out of memory\n", __func__);
1249 ret = -ENOMEM;
1250 goto fail;
1251 }
1252 memcpy(tmpde, bh->b_data + offset, frag1);
1253 brelse(bh);
1254 bh = sb_bread(inode->i_sb, ++block);
1255 if (!bh)
1256 goto out_badread;
1257 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1258 de = tmpde;
1259 }
1260
1261 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1262 ei->i_iget5_offset,
1263 ISOFS_BUFFER_BITS(inode));
1264
1265 /* Assume it is a normal-format file unless told otherwise */
1266 ei->i_file_format = isofs_file_normal;
1267
1268 if (de->flags[-high_sierra] & 2) {
1269 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1270 inode->i_mode = S_IFDIR | sbi->s_dmode;
1271 else
1272 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1273 inode->i_nlink = 1; /*
1274 * Set to 1. We know there are 2, but
1275 * the find utility tries to optimize
1276 * if it is 2, and it screws up. It is
1277 * easier to give 1 which tells find to
1278 * do it the hard way.
1279 */
1280 } else {
1281 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1282 inode->i_mode = S_IFREG | sbi->s_fmode;
1283 } else {
1284 /*
1285 * Set default permissions: r-x for all. The disc
1286 * could be shared with DOS machines so virtually
1287 * anything could be a valid executable.
1288 */
1289 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1290 }
1291 inode->i_nlink = 1;
1292 }
1293 inode->i_uid = sbi->s_uid;
1294 inode->i_gid = sbi->s_gid;
1295 inode->i_blocks = 0;
1296
1297 ei->i_format_parm[0] = 0;
1298 ei->i_format_parm[1] = 0;
1299 ei->i_format_parm[2] = 0;
1300
1301 ei->i_section_size = isonum_733(de->size);
1302 if (de->flags[-high_sierra] & 0x80) {
1303 ret = isofs_read_level3_size(inode);
1304 if (ret < 0)
1305 goto fail;
1306 ret = -EIO;
1307 } else {
1308 ei->i_next_section_block = 0;
1309 ei->i_next_section_offset = 0;
1310 inode->i_size = isonum_733(de->size);
1311 }
1312
1313 /*
1314 * Some dipshit decided to store some other bit of information
1315 * in the high byte of the file length. Truncate size in case
1316 * this CDROM was mounted with the cruft option.
1317 */
1318
1319 if (sbi->s_cruft)
1320 inode->i_size &= 0x00ffffff;
1321
1322 if (de->interleave[0]) {
1323 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1324 inode->i_size = 0;
1325 }
1326
1327 /* I have no idea what file_unit_size is used for, so
1328 we will flag it for now */
1329 if (de->file_unit_size[0] != 0) {
1330 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1331 inode->i_ino);
1332 }
1333
1334 /* I have no idea what other flag bits are used for, so
1335 we will flag it for now */
1336 #ifdef DEBUG
1337 if((de->flags[-high_sierra] & ~2)!= 0){
1338 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1339 "(%ld %x).\n",
1340 inode->i_ino, de->flags[-high_sierra]);
1341 }
1342 #endif
1343
1344 inode->i_mtime.tv_sec =
1345 inode->i_atime.tv_sec =
1346 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1347 inode->i_mtime.tv_nsec =
1348 inode->i_atime.tv_nsec =
1349 inode->i_ctime.tv_nsec = 0;
1350
1351 ei->i_first_extent = (isonum_733(de->extent) +
1352 isonum_711(de->ext_attr_length));
1353
1354 /* Set the number of blocks for stat() - should be done before RR */
1355 inode->i_blocks = (inode->i_size + 511) >> 9;
1356
1357 /*
1358 * Now test for possible Rock Ridge extensions which will override
1359 * some of these numbers in the inode structure.
1360 */
1361
1362 if (!high_sierra) {
1363 parse_rock_ridge_inode(de, inode);
1364 /* if we want uid/gid set, override the rock ridge setting */
1365 if (sbi->s_uid_set)
1366 inode->i_uid = sbi->s_uid;
1367 if (sbi->s_gid_set)
1368 inode->i_gid = sbi->s_gid;
1369 }
1370 /* Now set final access rights if overriding rock ridge setting */
1371 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1372 sbi->s_dmode != ISOFS_INVALID_MODE)
1373 inode->i_mode = S_IFDIR | sbi->s_dmode;
1374 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1375 sbi->s_fmode != ISOFS_INVALID_MODE)
1376 inode->i_mode = S_IFREG | sbi->s_fmode;
1377
1378 /* Install the inode operations vector */
1379 if (S_ISREG(inode->i_mode)) {
1380 inode->i_fop = &generic_ro_fops;
1381 switch (ei->i_file_format) {
1382 #ifdef CONFIG_ZISOFS
1383 case isofs_file_compressed:
1384 inode->i_data.a_ops = &zisofs_aops;
1385 break;
1386 #endif
1387 default:
1388 inode->i_data.a_ops = &isofs_aops;
1389 break;
1390 }
1391 } else if (S_ISDIR(inode->i_mode)) {
1392 inode->i_op = &isofs_dir_inode_operations;
1393 inode->i_fop = &isofs_dir_operations;
1394 } else if (S_ISLNK(inode->i_mode)) {
1395 inode->i_op = &page_symlink_inode_operations;
1396 inode->i_data.a_ops = &isofs_symlink_aops;
1397 } else
1398 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1399 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1400
1401 ret = 0;
1402 out:
1403 kfree(tmpde);
1404 if (bh)
1405 brelse(bh);
1406 return ret;
1407
1408 out_badread:
1409 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1410 fail:
1411 goto out;
1412 }
1413
1414 struct isofs_iget5_callback_data {
1415 unsigned long block;
1416 unsigned long offset;
1417 };
1418
1419 static int isofs_iget5_test(struct inode *ino, void *data)
1420 {
1421 struct iso_inode_info *i = ISOFS_I(ino);
1422 struct isofs_iget5_callback_data *d =
1423 (struct isofs_iget5_callback_data*)data;
1424 return (i->i_iget5_block == d->block)
1425 && (i->i_iget5_offset == d->offset);
1426 }
1427
1428 static int isofs_iget5_set(struct inode *ino, void *data)
1429 {
1430 struct iso_inode_info *i = ISOFS_I(ino);
1431 struct isofs_iget5_callback_data *d =
1432 (struct isofs_iget5_callback_data*)data;
1433 i->i_iget5_block = d->block;
1434 i->i_iget5_offset = d->offset;
1435 return 0;
1436 }
1437
1438 /* Store, in the inode's containing structure, the block and block
1439 * offset that point to the underlying meta-data for the inode. The
1440 * code below is otherwise similar to the iget() code in
1441 * include/linux/fs.h */
1442 struct inode *isofs_iget(struct super_block *sb,
1443 unsigned long block,
1444 unsigned long offset)
1445 {
1446 unsigned long hashval;
1447 struct inode *inode;
1448 struct isofs_iget5_callback_data data;
1449 long ret;
1450
1451 if (offset >= 1ul << sb->s_blocksize_bits)
1452 return ERR_PTR(-EINVAL);
1453
1454 data.block = block;
1455 data.offset = offset;
1456
1457 hashval = (block << sb->s_blocksize_bits) | offset;
1458
1459 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1460 &isofs_iget5_set, &data);
1461
1462 if (!inode)
1463 return ERR_PTR(-ENOMEM);
1464
1465 if (inode->i_state & I_NEW) {
1466 ret = isofs_read_inode(inode);
1467 if (ret < 0) {
1468 iget_failed(inode);
1469 inode = ERR_PTR(ret);
1470 } else {
1471 unlock_new_inode(inode);
1472 }
1473 }
1474
1475 return inode;
1476 }
1477
1478 static int isofs_get_sb(struct file_system_type *fs_type,
1479 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1480 {
1481 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1482 mnt);
1483 }
1484
1485 static struct file_system_type iso9660_fs_type = {
1486 .owner = THIS_MODULE,
1487 .name = "iso9660",
1488 .get_sb = isofs_get_sb,
1489 .kill_sb = kill_block_super,
1490 .fs_flags = FS_REQUIRES_DEV,
1491 };
1492
1493 static int __init init_iso9660_fs(void)
1494 {
1495 int err = init_inodecache();
1496 if (err)
1497 goto out;
1498 #ifdef CONFIG_ZISOFS
1499 err = zisofs_init();
1500 if (err)
1501 goto out1;
1502 #endif
1503 err = register_filesystem(&iso9660_fs_type);
1504 if (err)
1505 goto out2;
1506 return 0;
1507 out2:
1508 #ifdef CONFIG_ZISOFS
1509 zisofs_cleanup();
1510 out1:
1511 #endif
1512 destroy_inodecache();
1513 out:
1514 return err;
1515 }
1516
1517 static void __exit exit_iso9660_fs(void)
1518 {
1519 unregister_filesystem(&iso9660_fs_type);
1520 #ifdef CONFIG_ZISOFS
1521 zisofs_cleanup();
1522 #endif
1523 destroy_inodecache();
1524 }
1525
1526 module_init(init_iso9660_fs)
1527 module_exit(exit_iso9660_fs)
1528 MODULE_LICENSE("GPL");
1529 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1530 MODULE_ALIAS("iso9660");
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