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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / fs / isofs / inode.c
blob4a9e10ea13f2910570e989bdb2746fcc9ab796b1
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_hash(const struct dentry *parent, struct qstr *qstr);
33 static int isofs_dentry_cmpi(const struct dentry *parent,
34 const struct dentry *dentry,
35 unsigned int len, const char *str, const struct qstr *name);
36 static int isofs_dentry_cmp(const struct dentry *parent,
37 const struct dentry *dentry,
38 unsigned int len, const char *str, const struct qstr *name);
39
40 #ifdef CONFIG_JOLIET
41 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
42 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
43 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
44 const struct dentry *dentry,
45 unsigned int len, const char *str, const struct qstr *name);
46 static int isofs_dentry_cmp_ms(const struct dentry *parent,
47 const struct dentry *dentry,
48 unsigned int len, const char *str, const struct qstr *name);
49 #endif
50
51 static void isofs_put_super(struct super_block *sb)
52 {
53 struct isofs_sb_info *sbi = ISOFS_SB(sb);
54
55 #ifdef CONFIG_JOLIET
56 unload_nls(sbi->s_nls_iocharset);
57 #endif
58
59 kfree(sbi);
60 sb->s_fs_info = NULL;
61 return;
62 }
63
64 static int isofs_read_inode(struct inode *);
65 static int isofs_statfs (struct dentry *, struct kstatfs *);
66
67 static struct kmem_cache *isofs_inode_cachep;
68
69 static struct inode *isofs_alloc_inode(struct super_block *sb)
70 {
71 struct iso_inode_info *ei;
72 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
73 if (!ei)
74 return NULL;
75 return &ei->vfs_inode;
76 }
77
78 static void isofs_i_callback(struct rcu_head *head)
79 {
80 struct inode *inode = container_of(head, struct inode, i_rcu);
81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
82 }
83
84 static void isofs_destroy_inode(struct inode *inode)
85 {
86 call_rcu(&inode->i_rcu, isofs_i_callback);
87 }
88
89 static void init_once(void *foo)
90 {
91 struct iso_inode_info *ei = foo;
92
93 inode_init_once(&ei->vfs_inode);
94 }
95
96 static int init_inodecache(void)
97 {
98 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
99 sizeof(struct iso_inode_info),
100 0, (SLAB_RECLAIM_ACCOUNT|
101 SLAB_MEM_SPREAD),
102 init_once);
103 if (isofs_inode_cachep == NULL)
104 return -ENOMEM;
105 return 0;
106 }
107
108 static void destroy_inodecache(void)
109 {
110 /*
111 * Make sure all delayed rcu free inodes are flushed before we
112 * destroy cache.
113 */
114 rcu_barrier();
115 kmem_cache_destroy(isofs_inode_cachep);
116 }
117
118 static int isofs_remount(struct super_block *sb, int *flags, char *data)
119 {
120 if (!(*flags & MS_RDONLY))
121 return -EROFS;
122 return 0;
123 }
124
125 static const struct super_operations isofs_sops = {
126 .alloc_inode = isofs_alloc_inode,
127 .destroy_inode = isofs_destroy_inode,
128 .put_super = isofs_put_super,
129 .statfs = isofs_statfs,
130 .remount_fs = isofs_remount,
131 .show_options = generic_show_options,
132 };
133
134
135 static const struct dentry_operations isofs_dentry_ops[] = {
136 {
137 .d_hash = isofs_hash,
138 .d_compare = isofs_dentry_cmp,
139 },
140 {
141 .d_hash = isofs_hashi,
142 .d_compare = isofs_dentry_cmpi,
143 },
144 #ifdef CONFIG_JOLIET
145 {
146 .d_hash = isofs_hash_ms,
147 .d_compare = isofs_dentry_cmp_ms,
148 },
149 {
150 .d_hash = isofs_hashi_ms,
151 .d_compare = isofs_dentry_cmpi_ms,
152 },
153 #endif
154 };
155
156 struct iso9660_options{
157 unsigned int rock:1;
158 unsigned int joliet:1;
159 unsigned int cruft:1;
160 unsigned int hide:1;
161 unsigned int showassoc:1;
162 unsigned int nocompress:1;
163 unsigned int overriderockperm:1;
164 unsigned int uid_set:1;
165 unsigned int gid_set:1;
166 unsigned int utf8:1;
167 unsigned char map;
168 unsigned char check;
169 unsigned int blocksize;
170 umode_t fmode;
171 umode_t dmode;
172 kgid_t gid;
173 kuid_t uid;
174 char *iocharset;
175 /* LVE */
176 s32 session;
177 s32 sbsector;
178 };
179
180 /*
181 * Compute the hash for the isofs name corresponding to the dentry.
182 */
183 static int
184 isofs_hash_common(struct qstr *qstr, int ms)
185 {
186 const char *name;
187 int len;
188
189 len = qstr->len;
190 name = qstr->name;
191 if (ms) {
192 while (len && name[len-1] == '.')
193 len--;
194 }
195
196 qstr->hash = full_name_hash(name, len);
197
198 return 0;
199 }
200
201 /*
202 * Compute the hash for the isofs name corresponding to the dentry.
203 */
204 static int
205 isofs_hashi_common(struct qstr *qstr, int ms)
206 {
207 const char *name;
208 int len;
209 char c;
210 unsigned long hash;
211
212 len = qstr->len;
213 name = qstr->name;
214 if (ms) {
215 while (len && name[len-1] == '.')
216 len--;
217 }
218
219 hash = init_name_hash();
220 while (len--) {
221 c = tolower(*name++);
222 hash = partial_name_hash(c, hash);
223 }
224 qstr->hash = end_name_hash(hash);
225
226 return 0;
227 }
228
229 /*
230 * Compare of two isofs names.
231 */
232 static int isofs_dentry_cmp_common(
233 unsigned int len, const char *str,
234 const struct qstr *name, int ms, int ci)
235 {
236 int alen, blen;
237
238 /* A filename cannot end in '.' or we treat it like it has none */
239 alen = name->len;
240 blen = len;
241 if (ms) {
242 while (alen && name->name[alen-1] == '.')
243 alen--;
244 while (blen && str[blen-1] == '.')
245 blen--;
246 }
247 if (alen == blen) {
248 if (ci) {
249 if (strnicmp(name->name, str, alen) == 0)
250 return 0;
251 } else {
252 if (strncmp(name->name, str, alen) == 0)
253 return 0;
254 }
255 }
256 return 1;
257 }
258
259 static int
260 isofs_hash(const struct dentry *dentry, struct qstr *qstr)
261 {
262 return isofs_hash_common(qstr, 0);
263 }
264
265 static int
266 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
267 {
268 return isofs_hashi_common(qstr, 0);
269 }
270
271 static int
272 isofs_dentry_cmp(const struct dentry *parent, const struct dentry *dentry,
273 unsigned int len, const char *str, const struct qstr *name)
274 {
275 return isofs_dentry_cmp_common(len, str, name, 0, 0);
276 }
277
278 static int
279 isofs_dentry_cmpi(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, 0, 1);
283 }
284
285 #ifdef CONFIG_JOLIET
286 static int
287 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
288 {
289 return isofs_hash_common(qstr, 1);
290 }
291
292 static int
293 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
294 {
295 return isofs_hashi_common(qstr, 1);
296 }
297
298 static int
299 isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry,
300 unsigned int len, const char *str, const struct qstr *name)
301 {
302 return isofs_dentry_cmp_common(len, str, name, 1, 0);
303 }
304
305 static int
306 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
307 unsigned int len, const char *str, const struct qstr *name)
308 {
309 return isofs_dentry_cmp_common(len, str, name, 1, 1);
310 }
311 #endif
312
313 enum {
314 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
315 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
316 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
317 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
318 };
319
320 static const match_table_t tokens = {
321 {Opt_norock, "norock"},
322 {Opt_nojoliet, "nojoliet"},
323 {Opt_unhide, "unhide"},
324 {Opt_hide, "hide"},
325 {Opt_showassoc, "showassoc"},
326 {Opt_cruft, "cruft"},
327 {Opt_utf8, "utf8"},
328 {Opt_iocharset, "iocharset=%s"},
329 {Opt_map_a, "map=acorn"},
330 {Opt_map_a, "map=a"},
331 {Opt_map_n, "map=normal"},
332 {Opt_map_n, "map=n"},
333 {Opt_map_o, "map=off"},
334 {Opt_map_o, "map=o"},
335 {Opt_session, "session=%u"},
336 {Opt_sb, "sbsector=%u"},
337 {Opt_check_r, "check=relaxed"},
338 {Opt_check_r, "check=r"},
339 {Opt_check_s, "check=strict"},
340 {Opt_check_s, "check=s"},
341 {Opt_uid, "uid=%u"},
342 {Opt_gid, "gid=%u"},
343 {Opt_mode, "mode=%u"},
344 {Opt_dmode, "dmode=%u"},
345 {Opt_overriderockperm, "overriderockperm"},
346 {Opt_block, "block=%u"},
347 {Opt_ignore, "conv=binary"},
348 {Opt_ignore, "conv=b"},
349 {Opt_ignore, "conv=text"},
350 {Opt_ignore, "conv=t"},
351 {Opt_ignore, "conv=mtext"},
352 {Opt_ignore, "conv=m"},
353 {Opt_ignore, "conv=auto"},
354 {Opt_ignore, "conv=a"},
355 {Opt_nocompress, "nocompress"},
356 {Opt_err, NULL}
357 };
358
359 static int parse_options(char *options, struct iso9660_options *popt)
360 {
361 char *p;
362 int option;
363
364 popt->map = 'n';
365 popt->rock = 1;
366 popt->joliet = 1;
367 popt->cruft = 0;
368 popt->hide = 0;
369 popt->showassoc = 0;
370 popt->check = 'u'; /* unset */
371 popt->nocompress = 0;
372 popt->blocksize = 1024;
373 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
374 popt->uid_set = 0;
375 popt->gid_set = 0;
376 popt->gid = GLOBAL_ROOT_GID;
377 popt->uid = GLOBAL_ROOT_UID;
378 popt->iocharset = NULL;
379 popt->utf8 = 0;
380 popt->overriderockperm = 0;
381 popt->session=-1;
382 popt->sbsector=-1;
383 if (!options)
384 return 1;
385
386 while ((p = strsep(&options, ",")) != NULL) {
387 int token;
388 substring_t args[MAX_OPT_ARGS];
389 unsigned n;
390
391 if (!*p)
392 continue;
393
394 token = match_token(p, tokens, args);
395 switch (token) {
396 case Opt_norock:
397 popt->rock = 0;
398 break;
399 case Opt_nojoliet:
400 popt->joliet = 0;
401 break;
402 case Opt_hide:
403 popt->hide = 1;
404 break;
405 case Opt_unhide:
406 case Opt_showassoc:
407 popt->showassoc = 1;
408 break;
409 case Opt_cruft:
410 popt->cruft = 1;
411 break;
412 case Opt_utf8:
413 popt->utf8 = 1;
414 break;
415 #ifdef CONFIG_JOLIET
416 case Opt_iocharset:
417 popt->iocharset = match_strdup(&args[0]);
418 break;
419 #endif
420 case Opt_map_a:
421 popt->map = 'a';
422 break;
423 case Opt_map_o:
424 popt->map = 'o';
425 break;
426 case Opt_map_n:
427 popt->map = 'n';
428 break;
429 case Opt_session:
430 if (match_int(&args[0], &option))
431 return 0;
432 n = option;
433 if (n > 99)
434 return 0;
435 popt->session = n + 1;
436 break;
437 case Opt_sb:
438 if (match_int(&args[0], &option))
439 return 0;
440 popt->sbsector = option;
441 break;
442 case Opt_check_r:
443 popt->check = 'r';
444 break;
445 case Opt_check_s:
446 popt->check = 's';
447 break;
448 case Opt_ignore:
449 break;
450 case Opt_uid:
451 if (match_int(&args[0], &option))
452 return 0;
453 popt->uid = make_kuid(current_user_ns(), option);
454 if (!uid_valid(popt->uid))
455 return 0;
456 popt->uid_set = 1;
457 break;
458 case Opt_gid:
459 if (match_int(&args[0], &option))
460 return 0;
461 popt->gid = make_kgid(current_user_ns(), option);
462 if (!gid_valid(popt->gid))
463 return 0;
464 popt->gid_set = 1;
465 break;
466 case Opt_mode:
467 if (match_int(&args[0], &option))
468 return 0;
469 popt->fmode = option;
470 break;
471 case Opt_dmode:
472 if (match_int(&args[0], &option))
473 return 0;
474 popt->dmode = option;
475 break;
476 case Opt_overriderockperm:
477 popt->overriderockperm = 1;
478 break;
479 case Opt_block:
480 if (match_int(&args[0], &option))
481 return 0;
482 n = option;
483 if (n != 512 && n != 1024 && n != 2048)
484 return 0;
485 popt->blocksize = n;
486 break;
487 case Opt_nocompress:
488 popt->nocompress = 1;
489 break;
490 default:
491 return 0;
492 }
493 }
494 return 1;
495 }
496
497 /*
498 * look if the driver can tell the multi session redirection value
499 *
500 * don't change this if you don't know what you do, please!
501 * Multisession is legal only with XA disks.
502 * A non-XA disk with more than one volume descriptor may do it right, but
503 * usually is written in a nowhere standardized "multi-partition" manner.
504 * Multisession uses absolute addressing (solely the first frame of the whole
505 * track is #0), multi-partition uses relative addressing (each first frame of
506 * each track is #0), and a track is not a session.
507 *
508 * A broken CDwriter software or drive firmware does not set new standards,
509 * at least not if conflicting with the existing ones.
510 *
511 * emoenke@gwdg.de
512 */
513 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
514
515 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
516 {
517 struct cdrom_multisession ms_info;
518 unsigned int vol_desc_start;
519 struct block_device *bdev = sb->s_bdev;
520 int i;
521
522 vol_desc_start=0;
523 ms_info.addr_format=CDROM_LBA;
524 if(session >= 0 && session <= 99) {
525 struct cdrom_tocentry Te;
526 Te.cdte_track=session;
527 Te.cdte_format=CDROM_LBA;
528 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
529 if (!i) {
530 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
531 session, Te.cdte_addr.lba,
532 Te.cdte_ctrl&CDROM_DATA_TRACK);
533 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
534 return Te.cdte_addr.lba;
535 }
536
537 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
538 }
539 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
540 if (session > 0)
541 printk(KERN_ERR "ISOFS: Invalid session number\n");
542 #if 0
543 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
544 if (i==0) {
545 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
546 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
547 }
548 #endif
549 if (i==0)
550 #if WE_OBEY_THE_WRITTEN_STANDARDS
551 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
552 #endif
553 vol_desc_start=ms_info.addr.lba;
554 return vol_desc_start;
555 }
556
557 /*
558 * Check if root directory is empty (has less than 3 files).
559 *
560 * Used to detect broken CDs where ISO root directory is empty but Joliet root
561 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
562 * (and Joliet used instead) or else no files would be visible.
563 */
564 static bool rootdir_empty(struct super_block *sb, unsigned long block)
565 {
566 int offset = 0, files = 0, de_len;
567 struct iso_directory_record *de;
568 struct buffer_head *bh;
569
570 bh = sb_bread(sb, block);
571 if (!bh)
572 return true;
573 while (files < 3) {
574 de = (struct iso_directory_record *) (bh->b_data + offset);
575 de_len = *(unsigned char *) de;
576 if (de_len == 0)
577 break;
578 files++;
579 offset += de_len;
580 }
581 brelse(bh);
582 return files < 3;
583 }
584
585 /*
586 * Initialize the superblock and read the root inode.
587 *
588 * Note: a check_disk_change() has been done immediately prior
589 * to this call, so we don't need to check again.
590 */
591 static int isofs_fill_super(struct super_block *s, void *data, int silent)
592 {
593 struct buffer_head *bh = NULL, *pri_bh = NULL;
594 struct hs_primary_descriptor *h_pri = NULL;
595 struct iso_primary_descriptor *pri = NULL;
596 struct iso_supplementary_descriptor *sec = NULL;
597 struct iso_directory_record *rootp;
598 struct inode *inode;
599 struct iso9660_options opt;
600 struct isofs_sb_info *sbi;
601 unsigned long first_data_zone;
602 int joliet_level = 0;
603 int iso_blknum, block;
604 int orig_zonesize;
605 int table, error = -EINVAL;
606 unsigned int vol_desc_start;
607
608 save_mount_options(s, data);
609
610 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
611 if (!sbi)
612 return -ENOMEM;
613 s->s_fs_info = sbi;
614
615 if (!parse_options((char *)data, &opt))
616 goto out_freesbi;
617
618 /*
619 * First of all, get the hardware blocksize for this device.
620 * If we don't know what it is, or the hardware blocksize is
621 * larger than the blocksize the user specified, then use
622 * that value.
623 */
624 /*
625 * What if bugger tells us to go beyond page size?
626 */
627 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
628
629 sbi->s_high_sierra = 0; /* default is iso9660 */
630
631 vol_desc_start = (opt.sbsector != -1) ?
632 opt.sbsector : isofs_get_last_session(s,opt.session);
633
634 for (iso_blknum = vol_desc_start+16;
635 iso_blknum < vol_desc_start+100; iso_blknum++) {
636 struct hs_volume_descriptor *hdp;
637 struct iso_volume_descriptor *vdp;
638
639 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
640 if (!(bh = sb_bread(s, block)))
641 goto out_no_read;
642
643 vdp = (struct iso_volume_descriptor *)bh->b_data;
644 hdp = (struct hs_volume_descriptor *)bh->b_data;
645
646 /*
647 * Due to the overlapping physical location of the descriptors,
648 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
649 * proper identification in this case, we first check for ISO.
650 */
651 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
652 if (isonum_711(vdp->type) == ISO_VD_END)
653 break;
654 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
655 if (pri == NULL) {
656 pri = (struct iso_primary_descriptor *)vdp;
657 /* Save the buffer in case we need it ... */
658 pri_bh = bh;
659 bh = NULL;
660 }
661 }
662 #ifdef CONFIG_JOLIET
663 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
664 sec = (struct iso_supplementary_descriptor *)vdp;
665 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
666 if (opt.joliet) {
667 if (sec->escape[2] == 0x40)
668 joliet_level = 1;
669 else if (sec->escape[2] == 0x43)
670 joliet_level = 2;
671 else if (sec->escape[2] == 0x45)
672 joliet_level = 3;
673
674 printk(KERN_DEBUG "ISO 9660 Extensions: "
675 "Microsoft Joliet Level %d\n",
676 joliet_level);
677 }
678 goto root_found;
679 } else {
680 /* Unknown supplementary volume descriptor */
681 sec = NULL;
682 }
683 }
684 #endif
685 } else {
686 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
687 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
688 goto out_freebh;
689
690 sbi->s_high_sierra = 1;
691 opt.rock = 0;
692 h_pri = (struct hs_primary_descriptor *)vdp;
693 goto root_found;
694 }
695 }
696
697 /* Just skip any volume descriptors we don't recognize */
698
699 brelse(bh);
700 bh = NULL;
701 }
702 /*
703 * If we fall through, either no volume descriptor was found,
704 * or else we passed a primary descriptor looking for others.
705 */
706 if (!pri)
707 goto out_unknown_format;
708 brelse(bh);
709 bh = pri_bh;
710 pri_bh = NULL;
711
712 root_found:
713
714 if (joliet_level && (pri == NULL || !opt.rock)) {
715 /* This is the case of Joliet with the norock mount flag.
716 * A disc with both Joliet and Rock Ridge is handled later
717 */
718 pri = (struct iso_primary_descriptor *) sec;
719 }
720
721 if(sbi->s_high_sierra){
722 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
723 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
724 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
725 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
726 } else {
727 if (!pri)
728 goto out_freebh;
729 rootp = (struct iso_directory_record *) pri->root_directory_record;
730 sbi->s_nzones = isonum_733(pri->volume_space_size);
731 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
732 sbi->s_max_size = isonum_733(pri->volume_space_size);
733 }
734
735 sbi->s_ninodes = 0; /* No way to figure this out easily */
736
737 orig_zonesize = sbi->s_log_zone_size;
738 /*
739 * If the zone size is smaller than the hardware sector size,
740 * this is a fatal error. This would occur if the disc drive
741 * had sectors that were 2048 bytes, but the filesystem had
742 * blocks that were 512 bytes (which should only very rarely
743 * happen.)
744 */
745 if (orig_zonesize < opt.blocksize)
746 goto out_bad_size;
747
748 /* RDE: convert log zone size to bit shift */
749 switch (sbi->s_log_zone_size) {
750 case 512: sbi->s_log_zone_size = 9; break;
751 case 1024: sbi->s_log_zone_size = 10; break;
752 case 2048: sbi->s_log_zone_size = 11; break;
753
754 default:
755 goto out_bad_zone_size;
756 }
757
758 s->s_magic = ISOFS_SUPER_MAGIC;
759
760 /*
761 * With multi-extent files, file size is only limited by the maximum
762 * size of a file system, which is 8 TB.
763 */
764 s->s_maxbytes = 0x80000000000LL;
765
766 /* Set this for reference. Its not currently used except on write
767 which we don't have .. */
768
769 first_data_zone = isonum_733(rootp->extent) +
770 isonum_711(rootp->ext_attr_length);
771 sbi->s_firstdatazone = first_data_zone;
772 #ifndef BEQUIET
773 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
774 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
775 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
776 if(sbi->s_high_sierra)
777 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
778 #endif
779
780 /*
781 * If the Joliet level is set, we _may_ decide to use the
782 * secondary descriptor, but can't be sure until after we
783 * read the root inode. But before reading the root inode
784 * we may need to change the device blocksize, and would
785 * rather release the old buffer first. So, we cache the
786 * first_data_zone value from the secondary descriptor.
787 */
788 if (joliet_level) {
789 pri = (struct iso_primary_descriptor *) sec;
790 rootp = (struct iso_directory_record *)
791 pri->root_directory_record;
792 first_data_zone = isonum_733(rootp->extent) +
793 isonum_711(rootp->ext_attr_length);
794 }
795
796 /*
797 * We're all done using the volume descriptor, and may need
798 * to change the device blocksize, so release the buffer now.
799 */
800 brelse(pri_bh);
801 brelse(bh);
802
803 /*
804 * Force the blocksize to 512 for 512 byte sectors. The file
805 * read primitives really get it wrong in a bad way if we don't
806 * do this.
807 *
808 * Note - we should never be setting the blocksize to something
809 * less than the hardware sector size for the device. If we
810 * do, we would end up having to read larger buffers and split
811 * out portions to satisfy requests.
812 *
813 * Note2- the idea here is that we want to deal with the optimal
814 * zonesize in the filesystem. If we have it set to something less,
815 * then we have horrible problems with trying to piece together
816 * bits of adjacent blocks in order to properly read directory
817 * entries. By forcing the blocksize in this way, we ensure
818 * that we will never be required to do this.
819 */
820 sb_set_blocksize(s, orig_zonesize);
821
822 sbi->s_nls_iocharset = NULL;
823
824 #ifdef CONFIG_JOLIET
825 if (joliet_level && opt.utf8 == 0) {
826 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
827 sbi->s_nls_iocharset = load_nls(p);
828 if (! sbi->s_nls_iocharset) {
829 /* Fail only if explicit charset specified */
830 if (opt.iocharset)
831 goto out_freesbi;
832 sbi->s_nls_iocharset = load_nls_default();
833 }
834 }
835 #endif
836 s->s_op = &isofs_sops;
837 s->s_export_op = &isofs_export_ops;
838 sbi->s_mapping = opt.map;
839 sbi->s_rock = (opt.rock ? 2 : 0);
840 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
841 sbi->s_cruft = opt.cruft;
842 sbi->s_hide = opt.hide;
843 sbi->s_showassoc = opt.showassoc;
844 sbi->s_uid = opt.uid;
845 sbi->s_gid = opt.gid;
846 sbi->s_uid_set = opt.uid_set;
847 sbi->s_gid_set = opt.gid_set;
848 sbi->s_utf8 = opt.utf8;
849 sbi->s_nocompress = opt.nocompress;
850 sbi->s_overriderockperm = opt.overriderockperm;
851 /*
852 * It would be incredibly stupid to allow people to mark every file
853 * on the disk as suid, so we merely allow them to set the default
854 * permissions.
855 */
856 if (opt.fmode != ISOFS_INVALID_MODE)
857 sbi->s_fmode = opt.fmode & 0777;
858 else
859 sbi->s_fmode = ISOFS_INVALID_MODE;
860 if (opt.dmode != ISOFS_INVALID_MODE)
861 sbi->s_dmode = opt.dmode & 0777;
862 else
863 sbi->s_dmode = ISOFS_INVALID_MODE;
864
865 /*
866 * Read the root inode, which _may_ result in changing
867 * the s_rock flag. Once we have the final s_rock value,
868 * we then decide whether to use the Joliet descriptor.
869 */
870 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
871 if (IS_ERR(inode))
872 goto out_no_root;
873
874 /*
875 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
876 * correct Joliet root directory.
877 */
878 if (sbi->s_rock == 1 && joliet_level &&
879 rootdir_empty(s, sbi->s_firstdatazone)) {
880 printk(KERN_NOTICE
881 "ISOFS: primary root directory is empty. "
882 "Disabling Rock Ridge and switching to Joliet.");
883 sbi->s_rock = 0;
884 }
885
886 /*
887 * If this disk has both Rock Ridge and Joliet on it, then we
888 * want to use Rock Ridge by default. This can be overridden
889 * by using the norock mount option. There is still one other
890 * possibility that is not taken into account: a Rock Ridge
891 * CD with Unicode names. Until someone sees such a beast, it
892 * will not be supported.
893 */
894 if (sbi->s_rock == 1) {
895 joliet_level = 0;
896 } else if (joliet_level) {
897 sbi->s_rock = 0;
898 if (sbi->s_firstdatazone != first_data_zone) {
899 sbi->s_firstdatazone = first_data_zone;
900 printk(KERN_DEBUG
901 "ISOFS: changing to secondary root\n");
902 iput(inode);
903 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
904 if (IS_ERR(inode))
905 goto out_no_root;
906 }
907 }
908
909 if (opt.check == 'u') {
910 /* Only Joliet is case insensitive by default */
911 if (joliet_level)
912 opt.check = 'r';
913 else
914 opt.check = 's';
915 }
916 sbi->s_joliet_level = joliet_level;
917
918 /* Make sure the root inode is a directory */
919 if (!S_ISDIR(inode->i_mode)) {
920 printk(KERN_WARNING
921 "isofs_fill_super: root inode is not a directory. "
922 "Corrupted media?\n");
923 goto out_iput;
924 }
925
926 table = 0;
927 if (joliet_level)
928 table += 2;
929 if (opt.check == 'r')
930 table++;
931
932 s->s_d_op = &isofs_dentry_ops[table];
933
934 /* get the root dentry */
935 s->s_root = d_make_root(inode);
936 if (!(s->s_root)) {
937 error = -ENOMEM;
938 goto out_no_inode;
939 }
940
941 kfree(opt.iocharset);
942
943 return 0;
944
945 /*
946 * Display error messages and free resources.
947 */
948 out_iput:
949 iput(inode);
950 goto out_no_inode;
951 out_no_root:
952 error = PTR_ERR(inode);
953 if (error != -ENOMEM)
954 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
955 out_no_inode:
956 #ifdef CONFIG_JOLIET
957 unload_nls(sbi->s_nls_iocharset);
958 #endif
959 goto out_freesbi;
960 out_no_read:
961 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
962 __func__, s->s_id, iso_blknum, block);
963 goto out_freebh;
964 out_bad_zone_size:
965 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
966 sbi->s_log_zone_size);
967 goto out_freebh;
968 out_bad_size:
969 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
970 orig_zonesize, opt.blocksize);
971 goto out_freebh;
972 out_unknown_format:
973 if (!silent)
974 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
975
976 out_freebh:
977 brelse(bh);
978 brelse(pri_bh);
979 out_freesbi:
980 kfree(opt.iocharset);
981 kfree(sbi);
982 s->s_fs_info = NULL;
983 return error;
984 }
985
986 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
987 {
988 struct super_block *sb = dentry->d_sb;
989 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
990
991 buf->f_type = ISOFS_SUPER_MAGIC;
992 buf->f_bsize = sb->s_blocksize;
993 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
994 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
995 buf->f_bfree = 0;
996 buf->f_bavail = 0;
997 buf->f_files = ISOFS_SB(sb)->s_ninodes;
998 buf->f_ffree = 0;
999 buf->f_fsid.val[0] = (u32)id;
1000 buf->f_fsid.val[1] = (u32)(id >> 32);
1001 buf->f_namelen = NAME_MAX;
1002 return 0;
1003 }
1004
1005 /*
1006 * Get a set of blocks; filling in buffer_heads if already allocated
1007 * or getblk() if they are not. Returns the number of blocks inserted
1008 * (-ve == error.)
1009 */
1010 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1011 struct buffer_head **bh, unsigned long nblocks)
1012 {
1013 unsigned long b_off = iblock;
1014 unsigned offset, sect_size;
1015 unsigned int firstext;
1016 unsigned long nextblk, nextoff;
1017 int section, rv, error;
1018 struct iso_inode_info *ei = ISOFS_I(inode);
1019
1020 error = -EIO;
1021 rv = 0;
1022 if (iblock != b_off) {
1023 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1024 goto abort;
1025 }
1026
1027
1028 offset = 0;
1029 firstext = ei->i_first_extent;
1030 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1031 nextblk = ei->i_next_section_block;
1032 nextoff = ei->i_next_section_offset;
1033 section = 0;
1034
1035 while (nblocks) {
1036 /* If we are *way* beyond the end of the file, print a message.
1037 * Access beyond the end of the file up to the next page boundary
1038 * is normal, however because of the way the page cache works.
1039 * In this case, we just return 0 so that we can properly fill
1040 * the page with useless information without generating any
1041 * I/O errors.
1042 */
1043 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1044 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1045 __func__, b_off,
1046 (unsigned long long)inode->i_size);
1047 goto abort;
1048 }
1049
1050 /* On the last section, nextblk == 0, section size is likely to
1051 * exceed sect_size by a partial block, and access beyond the
1052 * end of the file will reach beyond the section size, too.
1053 */
1054 while (nextblk && (b_off >= (offset + sect_size))) {
1055 struct inode *ninode;
1056
1057 offset += sect_size;
1058 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1059 if (IS_ERR(ninode)) {
1060 error = PTR_ERR(ninode);
1061 goto abort;
1062 }
1063 firstext = ISOFS_I(ninode)->i_first_extent;
1064 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1065 nextblk = ISOFS_I(ninode)->i_next_section_block;
1066 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1067 iput(ninode);
1068
1069 if (++section > 100) {
1070 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1071 " aborting...\n", __func__);
1072 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1073 "nextblk=%lu nextoff=%lu\n", __func__,
1074 b_off, firstext, (unsigned) sect_size,
1075 nextblk, nextoff);
1076 goto abort;
1077 }
1078 }
1079
1080 if (*bh) {
1081 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1082 } else {
1083 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1084 if (!*bh)
1085 goto abort;
1086 }
1087 bh++; /* Next buffer head */
1088 b_off++; /* Next buffer offset */
1089 nblocks--;
1090 rv++;
1091 }
1092
1093 error = 0;
1094 abort:
1095 return rv != 0 ? rv : error;
1096 }
1097
1098 /*
1099 * Used by the standard interfaces.
1100 */
1101 static int isofs_get_block(struct inode *inode, sector_t iblock,
1102 struct buffer_head *bh_result, int create)
1103 {
1104 int ret;
1105
1106 if (create) {
1107 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1108 return -EROFS;
1109 }
1110
1111 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1112 return ret < 0 ? ret : 0;
1113 }
1114
1115 static int isofs_bmap(struct inode *inode, sector_t block)
1116 {
1117 struct buffer_head dummy;
1118 int error;
1119
1120 dummy.b_state = 0;
1121 dummy.b_blocknr = -1000;
1122 error = isofs_get_block(inode, block, &dummy, 0);
1123 if (!error)
1124 return dummy.b_blocknr;
1125 return 0;
1126 }
1127
1128 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1129 {
1130 sector_t blknr = isofs_bmap(inode, block);
1131 if (!blknr)
1132 return NULL;
1133 return sb_bread(inode->i_sb, blknr);
1134 }
1135
1136 static int isofs_readpage(struct file *file, struct page *page)
1137 {
1138 return mpage_readpage(page, isofs_get_block);
1139 }
1140
1141 static int isofs_readpages(struct file *file, struct address_space *mapping,
1142 struct list_head *pages, unsigned nr_pages)
1143 {
1144 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1145 }
1146
1147 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1148 {
1149 return generic_block_bmap(mapping,block,isofs_get_block);
1150 }
1151
1152 static const struct address_space_operations isofs_aops = {
1153 .readpage = isofs_readpage,
1154 .readpages = isofs_readpages,
1155 .bmap = _isofs_bmap
1156 };
1157
1158 static int isofs_read_level3_size(struct inode *inode)
1159 {
1160 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1161 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1162 struct buffer_head *bh = NULL;
1163 unsigned long block, offset, block_saved, offset_saved;
1164 int i = 0;
1165 int more_entries = 0;
1166 struct iso_directory_record *tmpde = NULL;
1167 struct iso_inode_info *ei = ISOFS_I(inode);
1168
1169 inode->i_size = 0;
1170
1171 /* The first 16 blocks are reserved as the System Area. Thus,
1172 * no inodes can appear in block 0. We use this to flag that
1173 * this is the last section. */
1174 ei->i_next_section_block = 0;
1175 ei->i_next_section_offset = 0;
1176
1177 block = ei->i_iget5_block;
1178 offset = ei->i_iget5_offset;
1179
1180 do {
1181 struct iso_directory_record *de;
1182 unsigned int de_len;
1183
1184 if (!bh) {
1185 bh = sb_bread(inode->i_sb, block);
1186 if (!bh)
1187 goto out_noread;
1188 }
1189 de = (struct iso_directory_record *) (bh->b_data + offset);
1190 de_len = *(unsigned char *) de;
1191
1192 if (de_len == 0) {
1193 brelse(bh);
1194 bh = NULL;
1195 ++block;
1196 offset = 0;
1197 continue;
1198 }
1199
1200 block_saved = block;
1201 offset_saved = offset;
1202 offset += de_len;
1203
1204 /* Make sure we have a full directory entry */
1205 if (offset >= bufsize) {
1206 int slop = bufsize - offset + de_len;
1207 if (!tmpde) {
1208 tmpde = kmalloc(256, GFP_KERNEL);
1209 if (!tmpde)
1210 goto out_nomem;
1211 }
1212 memcpy(tmpde, de, slop);
1213 offset &= bufsize - 1;
1214 block++;
1215 brelse(bh);
1216 bh = NULL;
1217 if (offset) {
1218 bh = sb_bread(inode->i_sb, block);
1219 if (!bh)
1220 goto out_noread;
1221 memcpy((void *)tmpde+slop, bh->b_data, offset);
1222 }
1223 de = tmpde;
1224 }
1225
1226 inode->i_size += isonum_733(de->size);
1227 if (i == 1) {
1228 ei->i_next_section_block = block_saved;
1229 ei->i_next_section_offset = offset_saved;
1230 }
1231
1232 more_entries = de->flags[-high_sierra] & 0x80;
1233
1234 i++;
1235 if (i > 100)
1236 goto out_toomany;
1237 } while (more_entries);
1238 out:
1239 kfree(tmpde);
1240 if (bh)
1241 brelse(bh);
1242 return 0;
1243
1244 out_nomem:
1245 if (bh)
1246 brelse(bh);
1247 return -ENOMEM;
1248
1249 out_noread:
1250 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1251 kfree(tmpde);
1252 return -EIO;
1253
1254 out_toomany:
1255 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1256 "isofs_read_level3_size: inode=%lu\n",
1257 __func__, inode->i_ino);
1258 goto out;
1259 }
1260
1261 static int isofs_read_inode(struct inode *inode)
1262 {
1263 struct super_block *sb = inode->i_sb;
1264 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1265 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1266 unsigned long block;
1267 int high_sierra = sbi->s_high_sierra;
1268 struct buffer_head *bh = NULL;
1269 struct iso_directory_record *de;
1270 struct iso_directory_record *tmpde = NULL;
1271 unsigned int de_len;
1272 unsigned long offset;
1273 struct iso_inode_info *ei = ISOFS_I(inode);
1274 int ret = -EIO;
1275
1276 block = ei->i_iget5_block;
1277 bh = sb_bread(inode->i_sb, block);
1278 if (!bh)
1279 goto out_badread;
1280
1281 offset = ei->i_iget5_offset;
1282
1283 de = (struct iso_directory_record *) (bh->b_data + offset);
1284 de_len = *(unsigned char *) de;
1285
1286 if (offset + de_len > bufsize) {
1287 int frag1 = bufsize - offset;
1288
1289 tmpde = kmalloc(de_len, GFP_KERNEL);
1290 if (tmpde == NULL) {
1291 printk(KERN_INFO "%s: out of memory\n", __func__);
1292 ret = -ENOMEM;
1293 goto fail;
1294 }
1295 memcpy(tmpde, bh->b_data + offset, frag1);
1296 brelse(bh);
1297 bh = sb_bread(inode->i_sb, ++block);
1298 if (!bh)
1299 goto out_badread;
1300 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1301 de = tmpde;
1302 }
1303
1304 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1305 ei->i_iget5_offset,
1306 ISOFS_BUFFER_BITS(inode));
1307
1308 /* Assume it is a normal-format file unless told otherwise */
1309 ei->i_file_format = isofs_file_normal;
1310
1311 if (de->flags[-high_sierra] & 2) {
1312 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1313 inode->i_mode = S_IFDIR | sbi->s_dmode;
1314 else
1315 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1316 set_nlink(inode, 1); /*
1317 * Set to 1. We know there are 2, but
1318 * the find utility tries to optimize
1319 * if it is 2, and it screws up. It is
1320 * easier to give 1 which tells find to
1321 * do it the hard way.
1322 */
1323 } else {
1324 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1325 inode->i_mode = S_IFREG | sbi->s_fmode;
1326 } else {
1327 /*
1328 * Set default permissions: r-x for all. The disc
1329 * could be shared with DOS machines so virtually
1330 * anything could be a valid executable.
1331 */
1332 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1333 }
1334 set_nlink(inode, 1);
1335 }
1336 inode->i_uid = sbi->s_uid;
1337 inode->i_gid = sbi->s_gid;
1338 inode->i_blocks = 0;
1339
1340 ei->i_format_parm[0] = 0;
1341 ei->i_format_parm[1] = 0;
1342 ei->i_format_parm[2] = 0;
1343
1344 ei->i_section_size = isonum_733(de->size);
1345 if (de->flags[-high_sierra] & 0x80) {
1346 ret = isofs_read_level3_size(inode);
1347 if (ret < 0)
1348 goto fail;
1349 ret = -EIO;
1350 } else {
1351 ei->i_next_section_block = 0;
1352 ei->i_next_section_offset = 0;
1353 inode->i_size = isonum_733(de->size);
1354 }
1355
1356 /*
1357 * Some dipshit decided to store some other bit of information
1358 * in the high byte of the file length. Truncate size in case
1359 * this CDROM was mounted with the cruft option.
1360 */
1361
1362 if (sbi->s_cruft)
1363 inode->i_size &= 0x00ffffff;
1364
1365 if (de->interleave[0]) {
1366 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1367 inode->i_size = 0;
1368 }
1369
1370 /* I have no idea what file_unit_size is used for, so
1371 we will flag it for now */
1372 if (de->file_unit_size[0] != 0) {
1373 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1374 inode->i_ino);
1375 }
1376
1377 /* I have no idea what other flag bits are used for, so
1378 we will flag it for now */
1379 #ifdef DEBUG
1380 if((de->flags[-high_sierra] & ~2)!= 0){
1381 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1382 "(%ld %x).\n",
1383 inode->i_ino, de->flags[-high_sierra]);
1384 }
1385 #endif
1386
1387 inode->i_mtime.tv_sec =
1388 inode->i_atime.tv_sec =
1389 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1390 inode->i_mtime.tv_nsec =
1391 inode->i_atime.tv_nsec =
1392 inode->i_ctime.tv_nsec = 0;
1393
1394 ei->i_first_extent = (isonum_733(de->extent) +
1395 isonum_711(de->ext_attr_length));
1396
1397 /* Set the number of blocks for stat() - should be done before RR */
1398 inode->i_blocks = (inode->i_size + 511) >> 9;
1399
1400 /*
1401 * Now test for possible Rock Ridge extensions which will override
1402 * some of these numbers in the inode structure.
1403 */
1404
1405 if (!high_sierra) {
1406 parse_rock_ridge_inode(de, inode);
1407 /* if we want uid/gid set, override the rock ridge setting */
1408 if (sbi->s_uid_set)
1409 inode->i_uid = sbi->s_uid;
1410 if (sbi->s_gid_set)
1411 inode->i_gid = sbi->s_gid;
1412 }
1413 /* Now set final access rights if overriding rock ridge setting */
1414 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1415 sbi->s_dmode != ISOFS_INVALID_MODE)
1416 inode->i_mode = S_IFDIR | sbi->s_dmode;
1417 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1418 sbi->s_fmode != ISOFS_INVALID_MODE)
1419 inode->i_mode = S_IFREG | sbi->s_fmode;
1420
1421 /* Install the inode operations vector */
1422 if (S_ISREG(inode->i_mode)) {
1423 inode->i_fop = &generic_ro_fops;
1424 switch (ei->i_file_format) {
1425 #ifdef CONFIG_ZISOFS
1426 case isofs_file_compressed:
1427 inode->i_data.a_ops = &zisofs_aops;
1428 break;
1429 #endif
1430 default:
1431 inode->i_data.a_ops = &isofs_aops;
1432 break;
1433 }
1434 } else if (S_ISDIR(inode->i_mode)) {
1435 inode->i_op = &isofs_dir_inode_operations;
1436 inode->i_fop = &isofs_dir_operations;
1437 } else if (S_ISLNK(inode->i_mode)) {
1438 inode->i_op = &page_symlink_inode_operations;
1439 inode->i_data.a_ops = &isofs_symlink_aops;
1440 } else
1441 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1442 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1443
1444 ret = 0;
1445 out:
1446 kfree(tmpde);
1447 if (bh)
1448 brelse(bh);
1449 return ret;
1450
1451 out_badread:
1452 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1453 fail:
1454 goto out;
1455 }
1456
1457 struct isofs_iget5_callback_data {
1458 unsigned long block;
1459 unsigned long offset;
1460 };
1461
1462 static int isofs_iget5_test(struct inode *ino, void *data)
1463 {
1464 struct iso_inode_info *i = ISOFS_I(ino);
1465 struct isofs_iget5_callback_data *d =
1466 (struct isofs_iget5_callback_data*)data;
1467 return (i->i_iget5_block == d->block)
1468 && (i->i_iget5_offset == d->offset);
1469 }
1470
1471 static int isofs_iget5_set(struct inode *ino, void *data)
1472 {
1473 struct iso_inode_info *i = ISOFS_I(ino);
1474 struct isofs_iget5_callback_data *d =
1475 (struct isofs_iget5_callback_data*)data;
1476 i->i_iget5_block = d->block;
1477 i->i_iget5_offset = d->offset;
1478 return 0;
1479 }
1480
1481 /* Store, in the inode's containing structure, the block and block
1482 * offset that point to the underlying meta-data for the inode. The
1483 * code below is otherwise similar to the iget() code in
1484 * include/linux/fs.h */
1485 struct inode *isofs_iget(struct super_block *sb,
1486 unsigned long block,
1487 unsigned long offset)
1488 {
1489 unsigned long hashval;
1490 struct inode *inode;
1491 struct isofs_iget5_callback_data data;
1492 long ret;
1493
1494 if (offset >= 1ul << sb->s_blocksize_bits)
1495 return ERR_PTR(-EINVAL);
1496
1497 data.block = block;
1498 data.offset = offset;
1499
1500 hashval = (block << sb->s_blocksize_bits) | offset;
1501
1502 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1503 &isofs_iget5_set, &data);
1504
1505 if (!inode)
1506 return ERR_PTR(-ENOMEM);
1507
1508 if (inode->i_state & I_NEW) {
1509 ret = isofs_read_inode(inode);
1510 if (ret < 0) {
1511 iget_failed(inode);
1512 inode = ERR_PTR(ret);
1513 } else {
1514 unlock_new_inode(inode);
1515 }
1516 }
1517
1518 return inode;
1519 }
1520
1521 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1522 int flags, const char *dev_name, void *data)
1523 {
1524 /* We don't support read-write mounts */
1525 if (!(flags & MS_RDONLY))
1526 return ERR_PTR(-EACCES);
1527 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1528 }
1529
1530 static struct file_system_type iso9660_fs_type = {
1531 .owner = THIS_MODULE,
1532 .name = "iso9660",
1533 .mount = isofs_mount,
1534 .kill_sb = kill_block_super,
1535 .fs_flags = FS_REQUIRES_DEV,
1536 };
1537 MODULE_ALIAS_FS("iso9660");
1538 MODULE_ALIAS("iso9660");
1539
1540 static int __init init_iso9660_fs(void)
1541 {
1542 int err = init_inodecache();
1543 if (err)
1544 goto out;
1545 #ifdef CONFIG_ZISOFS
1546 err = zisofs_init();
1547 if (err)
1548 goto out1;
1549 #endif
1550 err = register_filesystem(&iso9660_fs_type);
1551 if (err)
1552 goto out2;
1553 return 0;
1554 out2:
1555 #ifdef CONFIG_ZISOFS
1556 zisofs_cleanup();
1557 out1:
1558 #endif
1559 destroy_inodecache();
1560 out:
1561 return err;
1562 }
1563
1564 static void __exit exit_iso9660_fs(void)
1565 {
1566 unregister_filesystem(&iso9660_fs_type);
1567 #ifdef CONFIG_ZISOFS
1568 zisofs_cleanup();
1569 #endif
1570 destroy_inodecache();
1571 }
1572
1573 module_init(init_iso9660_fs)
1574 module_exit(exit_iso9660_fs)
1575 MODULE_LICENSE("GPL");
Linux with added FPC-III support