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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux...
[deliverable/linux.git] / fs / isofs / inode.c
1 /*
2 * linux/fs/isofs/inode.c
3 *
4 * (C) 1991 Linus Torvalds - minix filesystem
5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
6 * 1994 Eberhard Mönkeberg - multi session handling.
7 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
8 * 1997 Gordon Chaffee - Joliet CDs
9 * 1998 Eric Lammerts - ISO 9660 Level 3
10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
11 * 2004 Paul Serice - NFS Export Operations
12 */
13
14 #include <linux/init.h>
15 #include <linux/module.h>
16
17 #include <linux/slab.h>
18 #include <linux/nls.h>
19 #include <linux/ctype.h>
20 #include <linux/statfs.h>
21 #include <linux/cdrom.h>
22 #include <linux/parser.h>
23 #include <linux/mpage.h>
24 #include <linux/user_namespace.h>
25
26 #include "isofs.h"
27 #include "zisofs.h"
28
29 #define BEQUIET
30
31 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
32 static int isofs_dentry_cmpi(const struct dentry *parent,
33 const struct dentry *dentry,
34 unsigned int len, const char *str, const struct qstr *name);
35
36 #ifdef CONFIG_JOLIET
37 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
38 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
39 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
40 const struct dentry *dentry,
41 unsigned int len, const char *str, const struct qstr *name);
42 static int isofs_dentry_cmp_ms(const struct dentry *parent,
43 const struct dentry *dentry,
44 unsigned int len, const char *str, const struct qstr *name);
45 #endif
46
47 static void isofs_put_super(struct super_block *sb)
48 {
49 struct isofs_sb_info *sbi = ISOFS_SB(sb);
50
51 #ifdef CONFIG_JOLIET
52 unload_nls(sbi->s_nls_iocharset);
53 #endif
54
55 kfree(sbi);
56 sb->s_fs_info = NULL;
57 return;
58 }
59
60 static int isofs_read_inode(struct inode *, int relocated);
61 static int isofs_statfs (struct dentry *, struct kstatfs *);
62
63 static struct kmem_cache *isofs_inode_cachep;
64
65 static struct inode *isofs_alloc_inode(struct super_block *sb)
66 {
67 struct iso_inode_info *ei;
68 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
69 if (!ei)
70 return NULL;
71 return &ei->vfs_inode;
72 }
73
74 static void isofs_i_callback(struct rcu_head *head)
75 {
76 struct inode *inode = container_of(head, struct inode, i_rcu);
77 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
78 }
79
80 static void isofs_destroy_inode(struct inode *inode)
81 {
82 call_rcu(&inode->i_rcu, isofs_i_callback);
83 }
84
85 static void init_once(void *foo)
86 {
87 struct iso_inode_info *ei = foo;
88
89 inode_init_once(&ei->vfs_inode);
90 }
91
92 static int __init init_inodecache(void)
93 {
94 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
95 sizeof(struct iso_inode_info),
96 0, (SLAB_RECLAIM_ACCOUNT|
97 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
98 init_once);
99 if (isofs_inode_cachep == NULL)
100 return -ENOMEM;
101 return 0;
102 }
103
104 static void destroy_inodecache(void)
105 {
106 /*
107 * Make sure all delayed rcu free inodes are flushed before we
108 * destroy cache.
109 */
110 rcu_barrier();
111 kmem_cache_destroy(isofs_inode_cachep);
112 }
113
114 static int isofs_remount(struct super_block *sb, int *flags, char *data)
115 {
116 sync_filesystem(sb);
117 if (!(*flags & MS_RDONLY))
118 return -EROFS;
119 return 0;
120 }
121
122 static const struct super_operations isofs_sops = {
123 .alloc_inode = isofs_alloc_inode,
124 .destroy_inode = isofs_destroy_inode,
125 .put_super = isofs_put_super,
126 .statfs = isofs_statfs,
127 .remount_fs = isofs_remount,
128 .show_options = generic_show_options,
129 };
130
131
132 static const struct dentry_operations isofs_dentry_ops[] = {
133 {
134 .d_hash = isofs_hashi,
135 .d_compare = isofs_dentry_cmpi,
136 },
137 #ifdef CONFIG_JOLIET
138 {
139 .d_hash = isofs_hash_ms,
140 .d_compare = isofs_dentry_cmp_ms,
141 },
142 {
143 .d_hash = isofs_hashi_ms,
144 .d_compare = isofs_dentry_cmpi_ms,
145 },
146 #endif
147 };
148
149 struct iso9660_options{
150 unsigned int rock:1;
151 unsigned int joliet:1;
152 unsigned int cruft:1;
153 unsigned int hide:1;
154 unsigned int showassoc:1;
155 unsigned int nocompress:1;
156 unsigned int overriderockperm:1;
157 unsigned int uid_set:1;
158 unsigned int gid_set:1;
159 unsigned int utf8:1;
160 unsigned char map;
161 unsigned char check;
162 unsigned int blocksize;
163 umode_t fmode;
164 umode_t dmode;
165 kgid_t gid;
166 kuid_t uid;
167 char *iocharset;
168 /* LVE */
169 s32 session;
170 s32 sbsector;
171 };
172
173 /*
174 * Compute the hash for the isofs name corresponding to the dentry.
175 */
176 static int
177 isofs_hashi_common(struct qstr *qstr, int ms)
178 {
179 const char *name;
180 int len;
181 char c;
182 unsigned long hash;
183
184 len = qstr->len;
185 name = qstr->name;
186 if (ms) {
187 while (len && name[len-1] == '.')
188 len--;
189 }
190
191 hash = init_name_hash();
192 while (len--) {
193 c = tolower(*name++);
194 hash = partial_name_hash(c, hash);
195 }
196 qstr->hash = end_name_hash(hash);
197
198 return 0;
199 }
200
201 /*
202 * Compare of two isofs names.
203 */
204 static int isofs_dentry_cmp_common(
205 unsigned int len, const char *str,
206 const struct qstr *name, int ms, int ci)
207 {
208 int alen, blen;
209
210 /* A filename cannot end in '.' or we treat it like it has none */
211 alen = name->len;
212 blen = len;
213 if (ms) {
214 while (alen && name->name[alen-1] == '.')
215 alen--;
216 while (blen && str[blen-1] == '.')
217 blen--;
218 }
219 if (alen == blen) {
220 if (ci) {
221 if (strncasecmp(name->name, str, alen) == 0)
222 return 0;
223 } else {
224 if (strncmp(name->name, str, alen) == 0)
225 return 0;
226 }
227 }
228 return 1;
229 }
230
231 static int
232 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
233 {
234 return isofs_hashi_common(qstr, 0);
235 }
236
237 static int
238 isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry,
239 unsigned int len, const char *str, const struct qstr *name)
240 {
241 return isofs_dentry_cmp_common(len, str, name, 0, 1);
242 }
243
244 #ifdef CONFIG_JOLIET
245 /*
246 * Compute the hash for the isofs name corresponding to the dentry.
247 */
248 static int
249 isofs_hash_common(struct qstr *qstr, int ms)
250 {
251 const char *name;
252 int len;
253
254 len = qstr->len;
255 name = qstr->name;
256 if (ms) {
257 while (len && name[len-1] == '.')
258 len--;
259 }
260
261 qstr->hash = full_name_hash(name, len);
262
263 return 0;
264 }
265
266 static int
267 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
268 {
269 return isofs_hash_common(qstr, 1);
270 }
271
272 static int
273 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
274 {
275 return isofs_hashi_common(qstr, 1);
276 }
277
278 static int
279 isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry,
280 unsigned int len, const char *str, const struct qstr *name)
281 {
282 return isofs_dentry_cmp_common(len, str, name, 1, 0);
283 }
284
285 static int
286 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
287 unsigned int len, const char *str, const struct qstr *name)
288 {
289 return isofs_dentry_cmp_common(len, str, name, 1, 1);
290 }
291 #endif
292
293 enum {
294 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
295 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
296 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
297 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
298 };
299
300 static const match_table_t tokens = {
301 {Opt_norock, "norock"},
302 {Opt_nojoliet, "nojoliet"},
303 {Opt_unhide, "unhide"},
304 {Opt_hide, "hide"},
305 {Opt_showassoc, "showassoc"},
306 {Opt_cruft, "cruft"},
307 {Opt_utf8, "utf8"},
308 {Opt_iocharset, "iocharset=%s"},
309 {Opt_map_a, "map=acorn"},
310 {Opt_map_a, "map=a"},
311 {Opt_map_n, "map=normal"},
312 {Opt_map_n, "map=n"},
313 {Opt_map_o, "map=off"},
314 {Opt_map_o, "map=o"},
315 {Opt_session, "session=%u"},
316 {Opt_sb, "sbsector=%u"},
317 {Opt_check_r, "check=relaxed"},
318 {Opt_check_r, "check=r"},
319 {Opt_check_s, "check=strict"},
320 {Opt_check_s, "check=s"},
321 {Opt_uid, "uid=%u"},
322 {Opt_gid, "gid=%u"},
323 {Opt_mode, "mode=%u"},
324 {Opt_dmode, "dmode=%u"},
325 {Opt_overriderockperm, "overriderockperm"},
326 {Opt_block, "block=%u"},
327 {Opt_ignore, "conv=binary"},
328 {Opt_ignore, "conv=b"},
329 {Opt_ignore, "conv=text"},
330 {Opt_ignore, "conv=t"},
331 {Opt_ignore, "conv=mtext"},
332 {Opt_ignore, "conv=m"},
333 {Opt_ignore, "conv=auto"},
334 {Opt_ignore, "conv=a"},
335 {Opt_nocompress, "nocompress"},
336 {Opt_err, NULL}
337 };
338
339 static int parse_options(char *options, struct iso9660_options *popt)
340 {
341 char *p;
342 int option;
343
344 popt->map = 'n';
345 popt->rock = 1;
346 popt->joliet = 1;
347 popt->cruft = 0;
348 popt->hide = 0;
349 popt->showassoc = 0;
350 popt->check = 'u'; /* unset */
351 popt->nocompress = 0;
352 popt->blocksize = 1024;
353 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
354 popt->uid_set = 0;
355 popt->gid_set = 0;
356 popt->gid = GLOBAL_ROOT_GID;
357 popt->uid = GLOBAL_ROOT_UID;
358 popt->iocharset = NULL;
359 popt->utf8 = 0;
360 popt->overriderockperm = 0;
361 popt->session=-1;
362 popt->sbsector=-1;
363 if (!options)
364 return 1;
365
366 while ((p = strsep(&options, ",")) != NULL) {
367 int token;
368 substring_t args[MAX_OPT_ARGS];
369 unsigned n;
370
371 if (!*p)
372 continue;
373
374 token = match_token(p, tokens, args);
375 switch (token) {
376 case Opt_norock:
377 popt->rock = 0;
378 break;
379 case Opt_nojoliet:
380 popt->joliet = 0;
381 break;
382 case Opt_hide:
383 popt->hide = 1;
384 break;
385 case Opt_unhide:
386 case Opt_showassoc:
387 popt->showassoc = 1;
388 break;
389 case Opt_cruft:
390 popt->cruft = 1;
391 break;
392 case Opt_utf8:
393 popt->utf8 = 1;
394 break;
395 #ifdef CONFIG_JOLIET
396 case Opt_iocharset:
397 popt->iocharset = match_strdup(&args[0]);
398 break;
399 #endif
400 case Opt_map_a:
401 popt->map = 'a';
402 break;
403 case Opt_map_o:
404 popt->map = 'o';
405 break;
406 case Opt_map_n:
407 popt->map = 'n';
408 break;
409 case Opt_session:
410 if (match_int(&args[0], &option))
411 return 0;
412 n = option;
413 if (n > 99)
414 return 0;
415 popt->session = n + 1;
416 break;
417 case Opt_sb:
418 if (match_int(&args[0], &option))
419 return 0;
420 popt->sbsector = option;
421 break;
422 case Opt_check_r:
423 popt->check = 'r';
424 break;
425 case Opt_check_s:
426 popt->check = 's';
427 break;
428 case Opt_ignore:
429 break;
430 case Opt_uid:
431 if (match_int(&args[0], &option))
432 return 0;
433 popt->uid = make_kuid(current_user_ns(), option);
434 if (!uid_valid(popt->uid))
435 return 0;
436 popt->uid_set = 1;
437 break;
438 case Opt_gid:
439 if (match_int(&args[0], &option))
440 return 0;
441 popt->gid = make_kgid(current_user_ns(), option);
442 if (!gid_valid(popt->gid))
443 return 0;
444 popt->gid_set = 1;
445 break;
446 case Opt_mode:
447 if (match_int(&args[0], &option))
448 return 0;
449 popt->fmode = option;
450 break;
451 case Opt_dmode:
452 if (match_int(&args[0], &option))
453 return 0;
454 popt->dmode = option;
455 break;
456 case Opt_overriderockperm:
457 popt->overriderockperm = 1;
458 break;
459 case Opt_block:
460 if (match_int(&args[0], &option))
461 return 0;
462 n = option;
463 if (n != 512 && n != 1024 && n != 2048)
464 return 0;
465 popt->blocksize = n;
466 break;
467 case Opt_nocompress:
468 popt->nocompress = 1;
469 break;
470 default:
471 return 0;
472 }
473 }
474 return 1;
475 }
476
477 /*
478 * look if the driver can tell the multi session redirection value
479 *
480 * don't change this if you don't know what you do, please!
481 * Multisession is legal only with XA disks.
482 * A non-XA disk with more than one volume descriptor may do it right, but
483 * usually is written in a nowhere standardized "multi-partition" manner.
484 * Multisession uses absolute addressing (solely the first frame of the whole
485 * track is #0), multi-partition uses relative addressing (each first frame of
486 * each track is #0), and a track is not a session.
487 *
488 * A broken CDwriter software or drive firmware does not set new standards,
489 * at least not if conflicting with the existing ones.
490 *
491 * emoenke@gwdg.de
492 */
493 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
494
495 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
496 {
497 struct cdrom_multisession ms_info;
498 unsigned int vol_desc_start;
499 struct block_device *bdev = sb->s_bdev;
500 int i;
501
502 vol_desc_start=0;
503 ms_info.addr_format=CDROM_LBA;
504 if(session >= 0 && session <= 99) {
505 struct cdrom_tocentry Te;
506 Te.cdte_track=session;
507 Te.cdte_format=CDROM_LBA;
508 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
509 if (!i) {
510 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
511 session, Te.cdte_addr.lba,
512 Te.cdte_ctrl&CDROM_DATA_TRACK);
513 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
514 return Te.cdte_addr.lba;
515 }
516
517 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
518 }
519 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
520 if (session > 0)
521 printk(KERN_ERR "ISOFS: Invalid session number\n");
522 #if 0
523 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
524 if (i==0) {
525 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
526 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
527 }
528 #endif
529 if (i==0)
530 #if WE_OBEY_THE_WRITTEN_STANDARDS
531 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
532 #endif
533 vol_desc_start=ms_info.addr.lba;
534 return vol_desc_start;
535 }
536
537 /*
538 * Check if root directory is empty (has less than 3 files).
539 *
540 * Used to detect broken CDs where ISO root directory is empty but Joliet root
541 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
542 * (and Joliet used instead) or else no files would be visible.
543 */
544 static bool rootdir_empty(struct super_block *sb, unsigned long block)
545 {
546 int offset = 0, files = 0, de_len;
547 struct iso_directory_record *de;
548 struct buffer_head *bh;
549
550 bh = sb_bread(sb, block);
551 if (!bh)
552 return true;
553 while (files < 3) {
554 de = (struct iso_directory_record *) (bh->b_data + offset);
555 de_len = *(unsigned char *) de;
556 if (de_len == 0)
557 break;
558 files++;
559 offset += de_len;
560 }
561 brelse(bh);
562 return files < 3;
563 }
564
565 /*
566 * Initialize the superblock and read the root inode.
567 *
568 * Note: a check_disk_change() has been done immediately prior
569 * to this call, so we don't need to check again.
570 */
571 static int isofs_fill_super(struct super_block *s, void *data, int silent)
572 {
573 struct buffer_head *bh = NULL, *pri_bh = NULL;
574 struct hs_primary_descriptor *h_pri = NULL;
575 struct iso_primary_descriptor *pri = NULL;
576 struct iso_supplementary_descriptor *sec = NULL;
577 struct iso_directory_record *rootp;
578 struct inode *inode;
579 struct iso9660_options opt;
580 struct isofs_sb_info *sbi;
581 unsigned long first_data_zone;
582 int joliet_level = 0;
583 int iso_blknum, block;
584 int orig_zonesize;
585 int table, error = -EINVAL;
586 unsigned int vol_desc_start;
587
588 save_mount_options(s, data);
589
590 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
591 if (!sbi)
592 return -ENOMEM;
593 s->s_fs_info = sbi;
594
595 if (!parse_options((char *)data, &opt))
596 goto out_freesbi;
597
598 /*
599 * First of all, get the hardware blocksize for this device.
600 * If we don't know what it is, or the hardware blocksize is
601 * larger than the blocksize the user specified, then use
602 * that value.
603 */
604 /*
605 * What if bugger tells us to go beyond page size?
606 */
607 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
608
609 sbi->s_high_sierra = 0; /* default is iso9660 */
610
611 vol_desc_start = (opt.sbsector != -1) ?
612 opt.sbsector : isofs_get_last_session(s,opt.session);
613
614 for (iso_blknum = vol_desc_start+16;
615 iso_blknum < vol_desc_start+100; iso_blknum++) {
616 struct hs_volume_descriptor *hdp;
617 struct iso_volume_descriptor *vdp;
618
619 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
620 if (!(bh = sb_bread(s, block)))
621 goto out_no_read;
622
623 vdp = (struct iso_volume_descriptor *)bh->b_data;
624 hdp = (struct hs_volume_descriptor *)bh->b_data;
625
626 /*
627 * Due to the overlapping physical location of the descriptors,
628 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
629 * proper identification in this case, we first check for ISO.
630 */
631 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
632 if (isonum_711(vdp->type) == ISO_VD_END)
633 break;
634 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
635 if (pri == NULL) {
636 pri = (struct iso_primary_descriptor *)vdp;
637 /* Save the buffer in case we need it ... */
638 pri_bh = bh;
639 bh = NULL;
640 }
641 }
642 #ifdef CONFIG_JOLIET
643 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
644 sec = (struct iso_supplementary_descriptor *)vdp;
645 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
646 if (opt.joliet) {
647 if (sec->escape[2] == 0x40)
648 joliet_level = 1;
649 else if (sec->escape[2] == 0x43)
650 joliet_level = 2;
651 else if (sec->escape[2] == 0x45)
652 joliet_level = 3;
653
654 printk(KERN_DEBUG "ISO 9660 Extensions: "
655 "Microsoft Joliet Level %d\n",
656 joliet_level);
657 }
658 goto root_found;
659 } else {
660 /* Unknown supplementary volume descriptor */
661 sec = NULL;
662 }
663 }
664 #endif
665 } else {
666 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
667 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
668 goto out_freebh;
669
670 sbi->s_high_sierra = 1;
671 opt.rock = 0;
672 h_pri = (struct hs_primary_descriptor *)vdp;
673 goto root_found;
674 }
675 }
676
677 /* Just skip any volume descriptors we don't recognize */
678
679 brelse(bh);
680 bh = NULL;
681 }
682 /*
683 * If we fall through, either no volume descriptor was found,
684 * or else we passed a primary descriptor looking for others.
685 */
686 if (!pri)
687 goto out_unknown_format;
688 brelse(bh);
689 bh = pri_bh;
690 pri_bh = NULL;
691
692 root_found:
693
694 if (joliet_level && (pri == NULL || !opt.rock)) {
695 /* This is the case of Joliet with the norock mount flag.
696 * A disc with both Joliet and Rock Ridge is handled later
697 */
698 pri = (struct iso_primary_descriptor *) sec;
699 }
700
701 if(sbi->s_high_sierra){
702 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
703 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
704 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
705 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
706 } else {
707 if (!pri)
708 goto out_freebh;
709 rootp = (struct iso_directory_record *) pri->root_directory_record;
710 sbi->s_nzones = isonum_733(pri->volume_space_size);
711 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
712 sbi->s_max_size = isonum_733(pri->volume_space_size);
713 }
714
715 sbi->s_ninodes = 0; /* No way to figure this out easily */
716
717 orig_zonesize = sbi->s_log_zone_size;
718 /*
719 * If the zone size is smaller than the hardware sector size,
720 * this is a fatal error. This would occur if the disc drive
721 * had sectors that were 2048 bytes, but the filesystem had
722 * blocks that were 512 bytes (which should only very rarely
723 * happen.)
724 */
725 if (orig_zonesize < opt.blocksize)
726 goto out_bad_size;
727
728 /* RDE: convert log zone size to bit shift */
729 switch (sbi->s_log_zone_size) {
730 case 512: sbi->s_log_zone_size = 9; break;
731 case 1024: sbi->s_log_zone_size = 10; break;
732 case 2048: sbi->s_log_zone_size = 11; break;
733
734 default:
735 goto out_bad_zone_size;
736 }
737
738 s->s_magic = ISOFS_SUPER_MAGIC;
739
740 /*
741 * With multi-extent files, file size is only limited by the maximum
742 * size of a file system, which is 8 TB.
743 */
744 s->s_maxbytes = 0x80000000000LL;
745
746 /* Set this for reference. Its not currently used except on write
747 which we don't have .. */
748
749 first_data_zone = isonum_733(rootp->extent) +
750 isonum_711(rootp->ext_attr_length);
751 sbi->s_firstdatazone = first_data_zone;
752 #ifndef BEQUIET
753 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
754 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
755 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
756 if(sbi->s_high_sierra)
757 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
758 #endif
759
760 /*
761 * If the Joliet level is set, we _may_ decide to use the
762 * secondary descriptor, but can't be sure until after we
763 * read the root inode. But before reading the root inode
764 * we may need to change the device blocksize, and would
765 * rather release the old buffer first. So, we cache the
766 * first_data_zone value from the secondary descriptor.
767 */
768 if (joliet_level) {
769 pri = (struct iso_primary_descriptor *) sec;
770 rootp = (struct iso_directory_record *)
771 pri->root_directory_record;
772 first_data_zone = isonum_733(rootp->extent) +
773 isonum_711(rootp->ext_attr_length);
774 }
775
776 /*
777 * We're all done using the volume descriptor, and may need
778 * to change the device blocksize, so release the buffer now.
779 */
780 brelse(pri_bh);
781 brelse(bh);
782
783 /*
784 * Force the blocksize to 512 for 512 byte sectors. The file
785 * read primitives really get it wrong in a bad way if we don't
786 * do this.
787 *
788 * Note - we should never be setting the blocksize to something
789 * less than the hardware sector size for the device. If we
790 * do, we would end up having to read larger buffers and split
791 * out portions to satisfy requests.
792 *
793 * Note2- the idea here is that we want to deal with the optimal
794 * zonesize in the filesystem. If we have it set to something less,
795 * then we have horrible problems with trying to piece together
796 * bits of adjacent blocks in order to properly read directory
797 * entries. By forcing the blocksize in this way, we ensure
798 * that we will never be required to do this.
799 */
800 sb_set_blocksize(s, orig_zonesize);
801
802 sbi->s_nls_iocharset = NULL;
803
804 #ifdef CONFIG_JOLIET
805 if (joliet_level && opt.utf8 == 0) {
806 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
807 sbi->s_nls_iocharset = load_nls(p);
808 if (! sbi->s_nls_iocharset) {
809 /* Fail only if explicit charset specified */
810 if (opt.iocharset)
811 goto out_freesbi;
812 sbi->s_nls_iocharset = load_nls_default();
813 }
814 }
815 #endif
816 s->s_op = &isofs_sops;
817 s->s_export_op = &isofs_export_ops;
818 sbi->s_mapping = opt.map;
819 sbi->s_rock = (opt.rock ? 2 : 0);
820 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
821 sbi->s_cruft = opt.cruft;
822 sbi->s_hide = opt.hide;
823 sbi->s_showassoc = opt.showassoc;
824 sbi->s_uid = opt.uid;
825 sbi->s_gid = opt.gid;
826 sbi->s_uid_set = opt.uid_set;
827 sbi->s_gid_set = opt.gid_set;
828 sbi->s_utf8 = opt.utf8;
829 sbi->s_nocompress = opt.nocompress;
830 sbi->s_overriderockperm = opt.overriderockperm;
831 /*
832 * It would be incredibly stupid to allow people to mark every file
833 * on the disk as suid, so we merely allow them to set the default
834 * permissions.
835 */
836 if (opt.fmode != ISOFS_INVALID_MODE)
837 sbi->s_fmode = opt.fmode & 0777;
838 else
839 sbi->s_fmode = ISOFS_INVALID_MODE;
840 if (opt.dmode != ISOFS_INVALID_MODE)
841 sbi->s_dmode = opt.dmode & 0777;
842 else
843 sbi->s_dmode = ISOFS_INVALID_MODE;
844
845 /*
846 * Read the root inode, which _may_ result in changing
847 * the s_rock flag. Once we have the final s_rock value,
848 * we then decide whether to use the Joliet descriptor.
849 */
850 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
851 if (IS_ERR(inode))
852 goto out_no_root;
853
854 /*
855 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
856 * correct Joliet root directory.
857 */
858 if (sbi->s_rock == 1 && joliet_level &&
859 rootdir_empty(s, sbi->s_firstdatazone)) {
860 printk(KERN_NOTICE
861 "ISOFS: primary root directory is empty. "
862 "Disabling Rock Ridge and switching to Joliet.");
863 sbi->s_rock = 0;
864 }
865
866 /*
867 * If this disk has both Rock Ridge and Joliet on it, then we
868 * want to use Rock Ridge by default. This can be overridden
869 * by using the norock mount option. There is still one other
870 * possibility that is not taken into account: a Rock Ridge
871 * CD with Unicode names. Until someone sees such a beast, it
872 * will not be supported.
873 */
874 if (sbi->s_rock == 1) {
875 joliet_level = 0;
876 } else if (joliet_level) {
877 sbi->s_rock = 0;
878 if (sbi->s_firstdatazone != first_data_zone) {
879 sbi->s_firstdatazone = first_data_zone;
880 printk(KERN_DEBUG
881 "ISOFS: changing to secondary root\n");
882 iput(inode);
883 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
884 if (IS_ERR(inode))
885 goto out_no_root;
886 }
887 }
888
889 if (opt.check == 'u') {
890 /* Only Joliet is case insensitive by default */
891 if (joliet_level)
892 opt.check = 'r';
893 else
894 opt.check = 's';
895 }
896 sbi->s_joliet_level = joliet_level;
897
898 /* Make sure the root inode is a directory */
899 if (!S_ISDIR(inode->i_mode)) {
900 printk(KERN_WARNING
901 "isofs_fill_super: root inode is not a directory. "
902 "Corrupted media?\n");
903 goto out_iput;
904 }
905
906 table = 0;
907 if (joliet_level)
908 table += 2;
909 if (opt.check == 'r')
910 table++;
911
912 if (table)
913 s->s_d_op = &isofs_dentry_ops[table - 1];
914
915 /* get the root dentry */
916 s->s_root = d_make_root(inode);
917 if (!(s->s_root)) {
918 error = -ENOMEM;
919 goto out_no_inode;
920 }
921
922 kfree(opt.iocharset);
923
924 return 0;
925
926 /*
927 * Display error messages and free resources.
928 */
929 out_iput:
930 iput(inode);
931 goto out_no_inode;
932 out_no_root:
933 error = PTR_ERR(inode);
934 if (error != -ENOMEM)
935 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
936 out_no_inode:
937 #ifdef CONFIG_JOLIET
938 unload_nls(sbi->s_nls_iocharset);
939 #endif
940 goto out_freesbi;
941 out_no_read:
942 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
943 __func__, s->s_id, iso_blknum, block);
944 goto out_freebh;
945 out_bad_zone_size:
946 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
947 sbi->s_log_zone_size);
948 goto out_freebh;
949 out_bad_size:
950 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
951 orig_zonesize, opt.blocksize);
952 goto out_freebh;
953 out_unknown_format:
954 if (!silent)
955 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
956
957 out_freebh:
958 brelse(bh);
959 brelse(pri_bh);
960 out_freesbi:
961 kfree(opt.iocharset);
962 kfree(sbi);
963 s->s_fs_info = NULL;
964 return error;
965 }
966
967 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
968 {
969 struct super_block *sb = dentry->d_sb;
970 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
971
972 buf->f_type = ISOFS_SUPER_MAGIC;
973 buf->f_bsize = sb->s_blocksize;
974 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
975 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
976 buf->f_bfree = 0;
977 buf->f_bavail = 0;
978 buf->f_files = ISOFS_SB(sb)->s_ninodes;
979 buf->f_ffree = 0;
980 buf->f_fsid.val[0] = (u32)id;
981 buf->f_fsid.val[1] = (u32)(id >> 32);
982 buf->f_namelen = NAME_MAX;
983 return 0;
984 }
985
986 /*
987 * Get a set of blocks; filling in buffer_heads if already allocated
988 * or getblk() if they are not. Returns the number of blocks inserted
989 * (-ve == error.)
990 */
991 int isofs_get_blocks(struct inode *inode, sector_t iblock,
992 struct buffer_head **bh, unsigned long nblocks)
993 {
994 unsigned long b_off = iblock;
995 unsigned offset, sect_size;
996 unsigned int firstext;
997 unsigned long nextblk, nextoff;
998 int section, rv, error;
999 struct iso_inode_info *ei = ISOFS_I(inode);
1000
1001 error = -EIO;
1002 rv = 0;
1003 if (iblock != b_off) {
1004 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1005 goto abort;
1006 }
1007
1008
1009 offset = 0;
1010 firstext = ei->i_first_extent;
1011 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1012 nextblk = ei->i_next_section_block;
1013 nextoff = ei->i_next_section_offset;
1014 section = 0;
1015
1016 while (nblocks) {
1017 /* If we are *way* beyond the end of the file, print a message.
1018 * Access beyond the end of the file up to the next page boundary
1019 * is normal, however because of the way the page cache works.
1020 * In this case, we just return 0 so that we can properly fill
1021 * the page with useless information without generating any
1022 * I/O errors.
1023 */
1024 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1025 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1026 __func__, b_off,
1027 (unsigned long long)inode->i_size);
1028 goto abort;
1029 }
1030
1031 /* On the last section, nextblk == 0, section size is likely to
1032 * exceed sect_size by a partial block, and access beyond the
1033 * end of the file will reach beyond the section size, too.
1034 */
1035 while (nextblk && (b_off >= (offset + sect_size))) {
1036 struct inode *ninode;
1037
1038 offset += sect_size;
1039 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1040 if (IS_ERR(ninode)) {
1041 error = PTR_ERR(ninode);
1042 goto abort;
1043 }
1044 firstext = ISOFS_I(ninode)->i_first_extent;
1045 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1046 nextblk = ISOFS_I(ninode)->i_next_section_block;
1047 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1048 iput(ninode);
1049
1050 if (++section > 100) {
1051 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1052 " aborting...\n", __func__);
1053 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1054 "nextblk=%lu nextoff=%lu\n", __func__,
1055 b_off, firstext, (unsigned) sect_size,
1056 nextblk, nextoff);
1057 goto abort;
1058 }
1059 }
1060
1061 if (*bh) {
1062 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1063 } else {
1064 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1065 if (!*bh)
1066 goto abort;
1067 }
1068 bh++; /* Next buffer head */
1069 b_off++; /* Next buffer offset */
1070 nblocks--;
1071 rv++;
1072 }
1073
1074 error = 0;
1075 abort:
1076 return rv != 0 ? rv : error;
1077 }
1078
1079 /*
1080 * Used by the standard interfaces.
1081 */
1082 static int isofs_get_block(struct inode *inode, sector_t iblock,
1083 struct buffer_head *bh_result, int create)
1084 {
1085 int ret;
1086
1087 if (create) {
1088 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1089 return -EROFS;
1090 }
1091
1092 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1093 return ret < 0 ? ret : 0;
1094 }
1095
1096 static int isofs_bmap(struct inode *inode, sector_t block)
1097 {
1098 struct buffer_head dummy;
1099 int error;
1100
1101 dummy.b_state = 0;
1102 dummy.b_blocknr = -1000;
1103 error = isofs_get_block(inode, block, &dummy, 0);
1104 if (!error)
1105 return dummy.b_blocknr;
1106 return 0;
1107 }
1108
1109 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1110 {
1111 sector_t blknr = isofs_bmap(inode, block);
1112 if (!blknr)
1113 return NULL;
1114 return sb_bread(inode->i_sb, blknr);
1115 }
1116
1117 static int isofs_readpage(struct file *file, struct page *page)
1118 {
1119 return mpage_readpage(page, isofs_get_block);
1120 }
1121
1122 static int isofs_readpages(struct file *file, struct address_space *mapping,
1123 struct list_head *pages, unsigned nr_pages)
1124 {
1125 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1126 }
1127
1128 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1129 {
1130 return generic_block_bmap(mapping,block,isofs_get_block);
1131 }
1132
1133 static const struct address_space_operations isofs_aops = {
1134 .readpage = isofs_readpage,
1135 .readpages = isofs_readpages,
1136 .bmap = _isofs_bmap
1137 };
1138
1139 static int isofs_read_level3_size(struct inode *inode)
1140 {
1141 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1142 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1143 struct buffer_head *bh = NULL;
1144 unsigned long block, offset, block_saved, offset_saved;
1145 int i = 0;
1146 int more_entries = 0;
1147 struct iso_directory_record *tmpde = NULL;
1148 struct iso_inode_info *ei = ISOFS_I(inode);
1149
1150 inode->i_size = 0;
1151
1152 /* The first 16 blocks are reserved as the System Area. Thus,
1153 * no inodes can appear in block 0. We use this to flag that
1154 * this is the last section. */
1155 ei->i_next_section_block = 0;
1156 ei->i_next_section_offset = 0;
1157
1158 block = ei->i_iget5_block;
1159 offset = ei->i_iget5_offset;
1160
1161 do {
1162 struct iso_directory_record *de;
1163 unsigned int de_len;
1164
1165 if (!bh) {
1166 bh = sb_bread(inode->i_sb, block);
1167 if (!bh)
1168 goto out_noread;
1169 }
1170 de = (struct iso_directory_record *) (bh->b_data + offset);
1171 de_len = *(unsigned char *) de;
1172
1173 if (de_len == 0) {
1174 brelse(bh);
1175 bh = NULL;
1176 ++block;
1177 offset = 0;
1178 continue;
1179 }
1180
1181 block_saved = block;
1182 offset_saved = offset;
1183 offset += de_len;
1184
1185 /* Make sure we have a full directory entry */
1186 if (offset >= bufsize) {
1187 int slop = bufsize - offset + de_len;
1188 if (!tmpde) {
1189 tmpde = kmalloc(256, GFP_KERNEL);
1190 if (!tmpde)
1191 goto out_nomem;
1192 }
1193 memcpy(tmpde, de, slop);
1194 offset &= bufsize - 1;
1195 block++;
1196 brelse(bh);
1197 bh = NULL;
1198 if (offset) {
1199 bh = sb_bread(inode->i_sb, block);
1200 if (!bh)
1201 goto out_noread;
1202 memcpy((void *)tmpde+slop, bh->b_data, offset);
1203 }
1204 de = tmpde;
1205 }
1206
1207 inode->i_size += isonum_733(de->size);
1208 if (i == 1) {
1209 ei->i_next_section_block = block_saved;
1210 ei->i_next_section_offset = offset_saved;
1211 }
1212
1213 more_entries = de->flags[-high_sierra] & 0x80;
1214
1215 i++;
1216 if (i > 100)
1217 goto out_toomany;
1218 } while (more_entries);
1219 out:
1220 kfree(tmpde);
1221 if (bh)
1222 brelse(bh);
1223 return 0;
1224
1225 out_nomem:
1226 if (bh)
1227 brelse(bh);
1228 return -ENOMEM;
1229
1230 out_noread:
1231 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1232 kfree(tmpde);
1233 return -EIO;
1234
1235 out_toomany:
1236 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1237 "isofs_read_level3_size: inode=%lu\n",
1238 __func__, inode->i_ino);
1239 goto out;
1240 }
1241
1242 static int isofs_read_inode(struct inode *inode, int relocated)
1243 {
1244 struct super_block *sb = inode->i_sb;
1245 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1246 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1247 unsigned long block;
1248 int high_sierra = sbi->s_high_sierra;
1249 struct buffer_head *bh = NULL;
1250 struct iso_directory_record *de;
1251 struct iso_directory_record *tmpde = NULL;
1252 unsigned int de_len;
1253 unsigned long offset;
1254 struct iso_inode_info *ei = ISOFS_I(inode);
1255 int ret = -EIO;
1256
1257 block = ei->i_iget5_block;
1258 bh = sb_bread(inode->i_sb, block);
1259 if (!bh)
1260 goto out_badread;
1261
1262 offset = ei->i_iget5_offset;
1263
1264 de = (struct iso_directory_record *) (bh->b_data + offset);
1265 de_len = *(unsigned char *) de;
1266
1267 if (offset + de_len > bufsize) {
1268 int frag1 = bufsize - offset;
1269
1270 tmpde = kmalloc(de_len, GFP_KERNEL);
1271 if (tmpde == NULL) {
1272 printk(KERN_INFO "%s: out of memory\n", __func__);
1273 ret = -ENOMEM;
1274 goto fail;
1275 }
1276 memcpy(tmpde, bh->b_data + offset, frag1);
1277 brelse(bh);
1278 bh = sb_bread(inode->i_sb, ++block);
1279 if (!bh)
1280 goto out_badread;
1281 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1282 de = tmpde;
1283 }
1284
1285 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1286 ei->i_iget5_offset,
1287 ISOFS_BUFFER_BITS(inode));
1288
1289 /* Assume it is a normal-format file unless told otherwise */
1290 ei->i_file_format = isofs_file_normal;
1291
1292 if (de->flags[-high_sierra] & 2) {
1293 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1294 inode->i_mode = S_IFDIR | sbi->s_dmode;
1295 else
1296 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1297 set_nlink(inode, 1); /*
1298 * Set to 1. We know there are 2, but
1299 * the find utility tries to optimize
1300 * if it is 2, and it screws up. It is
1301 * easier to give 1 which tells find to
1302 * do it the hard way.
1303 */
1304 } else {
1305 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1306 inode->i_mode = S_IFREG | sbi->s_fmode;
1307 } else {
1308 /*
1309 * Set default permissions: r-x for all. The disc
1310 * could be shared with DOS machines so virtually
1311 * anything could be a valid executable.
1312 */
1313 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1314 }
1315 set_nlink(inode, 1);
1316 }
1317 inode->i_uid = sbi->s_uid;
1318 inode->i_gid = sbi->s_gid;
1319 inode->i_blocks = 0;
1320
1321 ei->i_format_parm[0] = 0;
1322 ei->i_format_parm[1] = 0;
1323 ei->i_format_parm[2] = 0;
1324
1325 ei->i_section_size = isonum_733(de->size);
1326 if (de->flags[-high_sierra] & 0x80) {
1327 ret = isofs_read_level3_size(inode);
1328 if (ret < 0)
1329 goto fail;
1330 ret = -EIO;
1331 } else {
1332 ei->i_next_section_block = 0;
1333 ei->i_next_section_offset = 0;
1334 inode->i_size = isonum_733(de->size);
1335 }
1336
1337 /*
1338 * Some dipshit decided to store some other bit of information
1339 * in the high byte of the file length. Truncate size in case
1340 * this CDROM was mounted with the cruft option.
1341 */
1342
1343 if (sbi->s_cruft)
1344 inode->i_size &= 0x00ffffff;
1345
1346 if (de->interleave[0]) {
1347 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1348 inode->i_size = 0;
1349 }
1350
1351 /* I have no idea what file_unit_size is used for, so
1352 we will flag it for now */
1353 if (de->file_unit_size[0] != 0) {
1354 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1355 inode->i_ino);
1356 }
1357
1358 /* I have no idea what other flag bits are used for, so
1359 we will flag it for now */
1360 #ifdef DEBUG
1361 if((de->flags[-high_sierra] & ~2)!= 0){
1362 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1363 "(%ld %x).\n",
1364 inode->i_ino, de->flags[-high_sierra]);
1365 }
1366 #endif
1367
1368 inode->i_mtime.tv_sec =
1369 inode->i_atime.tv_sec =
1370 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1371 inode->i_mtime.tv_nsec =
1372 inode->i_atime.tv_nsec =
1373 inode->i_ctime.tv_nsec = 0;
1374
1375 ei->i_first_extent = (isonum_733(de->extent) +
1376 isonum_711(de->ext_attr_length));
1377
1378 /* Set the number of blocks for stat() - should be done before RR */
1379 inode->i_blocks = (inode->i_size + 511) >> 9;
1380
1381 /*
1382 * Now test for possible Rock Ridge extensions which will override
1383 * some of these numbers in the inode structure.
1384 */
1385
1386 if (!high_sierra) {
1387 parse_rock_ridge_inode(de, inode, relocated);
1388 /* if we want uid/gid set, override the rock ridge setting */
1389 if (sbi->s_uid_set)
1390 inode->i_uid = sbi->s_uid;
1391 if (sbi->s_gid_set)
1392 inode->i_gid = sbi->s_gid;
1393 }
1394 /* Now set final access rights if overriding rock ridge setting */
1395 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1396 sbi->s_dmode != ISOFS_INVALID_MODE)
1397 inode->i_mode = S_IFDIR | sbi->s_dmode;
1398 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1399 sbi->s_fmode != ISOFS_INVALID_MODE)
1400 inode->i_mode = S_IFREG | sbi->s_fmode;
1401
1402 /* Install the inode operations vector */
1403 if (S_ISREG(inode->i_mode)) {
1404 inode->i_fop = &generic_ro_fops;
1405 switch (ei->i_file_format) {
1406 #ifdef CONFIG_ZISOFS
1407 case isofs_file_compressed:
1408 inode->i_data.a_ops = &zisofs_aops;
1409 break;
1410 #endif
1411 default:
1412 inode->i_data.a_ops = &isofs_aops;
1413 break;
1414 }
1415 } else if (S_ISDIR(inode->i_mode)) {
1416 inode->i_op = &isofs_dir_inode_operations;
1417 inode->i_fop = &isofs_dir_operations;
1418 } else if (S_ISLNK(inode->i_mode)) {
1419 inode->i_op = &page_symlink_inode_operations;
1420 inode_nohighmem(inode);
1421 inode->i_data.a_ops = &isofs_symlink_aops;
1422 } else
1423 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1424 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1425
1426 ret = 0;
1427 out:
1428 kfree(tmpde);
1429 if (bh)
1430 brelse(bh);
1431 return ret;
1432
1433 out_badread:
1434 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1435 fail:
1436 goto out;
1437 }
1438
1439 struct isofs_iget5_callback_data {
1440 unsigned long block;
1441 unsigned long offset;
1442 };
1443
1444 static int isofs_iget5_test(struct inode *ino, void *data)
1445 {
1446 struct iso_inode_info *i = ISOFS_I(ino);
1447 struct isofs_iget5_callback_data *d =
1448 (struct isofs_iget5_callback_data*)data;
1449 return (i->i_iget5_block == d->block)
1450 && (i->i_iget5_offset == d->offset);
1451 }
1452
1453 static int isofs_iget5_set(struct inode *ino, void *data)
1454 {
1455 struct iso_inode_info *i = ISOFS_I(ino);
1456 struct isofs_iget5_callback_data *d =
1457 (struct isofs_iget5_callback_data*)data;
1458 i->i_iget5_block = d->block;
1459 i->i_iget5_offset = d->offset;
1460 return 0;
1461 }
1462
1463 /* Store, in the inode's containing structure, the block and block
1464 * offset that point to the underlying meta-data for the inode. The
1465 * code below is otherwise similar to the iget() code in
1466 * include/linux/fs.h */
1467 struct inode *__isofs_iget(struct super_block *sb,
1468 unsigned long block,
1469 unsigned long offset,
1470 int relocated)
1471 {
1472 unsigned long hashval;
1473 struct inode *inode;
1474 struct isofs_iget5_callback_data data;
1475 long ret;
1476
1477 if (offset >= 1ul << sb->s_blocksize_bits)
1478 return ERR_PTR(-EINVAL);
1479
1480 data.block = block;
1481 data.offset = offset;
1482
1483 hashval = (block << sb->s_blocksize_bits) | offset;
1484
1485 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1486 &isofs_iget5_set, &data);
1487
1488 if (!inode)
1489 return ERR_PTR(-ENOMEM);
1490
1491 if (inode->i_state & I_NEW) {
1492 ret = isofs_read_inode(inode, relocated);
1493 if (ret < 0) {
1494 iget_failed(inode);
1495 inode = ERR_PTR(ret);
1496 } else {
1497 unlock_new_inode(inode);
1498 }
1499 }
1500
1501 return inode;
1502 }
1503
1504 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1505 int flags, const char *dev_name, void *data)
1506 {
1507 /* We don't support read-write mounts */
1508 if (!(flags & MS_RDONLY))
1509 return ERR_PTR(-EACCES);
1510 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1511 }
1512
1513 static struct file_system_type iso9660_fs_type = {
1514 .owner = THIS_MODULE,
1515 .name = "iso9660",
1516 .mount = isofs_mount,
1517 .kill_sb = kill_block_super,
1518 .fs_flags = FS_REQUIRES_DEV,
1519 };
1520 MODULE_ALIAS_FS("iso9660");
1521 MODULE_ALIAS("iso9660");
1522
1523 static int __init init_iso9660_fs(void)
1524 {
1525 int err = init_inodecache();
1526 if (err)
1527 goto out;
1528 #ifdef CONFIG_ZISOFS
1529 err = zisofs_init();
1530 if (err)
1531 goto out1;
1532 #endif
1533 err = register_filesystem(&iso9660_fs_type);
1534 if (err)
1535 goto out2;
1536 return 0;
1537 out2:
1538 #ifdef CONFIG_ZISOFS
1539 zisofs_cleanup();
1540 out1:
1541 #endif
1542 destroy_inodecache();
1543 out:
1544 return err;
1545 }
1546
1547 static void __exit exit_iso9660_fs(void)
1548 {
1549 unregister_filesystem(&iso9660_fs_type);
1550 #ifdef CONFIG_ZISOFS
1551 zisofs_cleanup();
1552 #endif
1553 destroy_inodecache();
1554 }
1555
1556 module_init(init_iso9660_fs)
1557 module_exit(exit_iso9660_fs)
1558 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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