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ksefltest: MAINTAINERS git tree entry is incorrect
[linux/fpc-iii.git] / fs / isofs / inode.c
blob020ba093614641e02920cf622840444c47edbbc1
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/cred.h>
19 #include <linux/nls.h>
20 #include <linux/ctype.h>
21 #include <linux/statfs.h>
22 #include <linux/cdrom.h>
23 #include <linux/parser.h>
24 #include <linux/mpage.h>
25 #include <linux/user_namespace.h>
26
27 #include "isofs.h"
28 #include "zisofs.h"
29
30 #define BEQUIET
31
32 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
33 static int isofs_dentry_cmpi(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 *dentry,
40 unsigned int len, const char *str, const struct qstr *name);
41 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
42 unsigned int len, const char *str, const struct qstr *name);
43 #endif
44
45 static void isofs_put_super(struct super_block *sb)
46 {
47 struct isofs_sb_info *sbi = ISOFS_SB(sb);
48
49 #ifdef CONFIG_JOLIET
50 unload_nls(sbi->s_nls_iocharset);
51 #endif
52
53 kfree(sbi);
54 sb->s_fs_info = NULL;
55 return;
56 }
57
58 static int isofs_read_inode(struct inode *, int relocated);
59 static int isofs_statfs (struct dentry *, struct kstatfs *);
60
61 static struct kmem_cache *isofs_inode_cachep;
62
63 static struct inode *isofs_alloc_inode(struct super_block *sb)
64 {
65 struct iso_inode_info *ei;
66 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
67 if (!ei)
68 return NULL;
69 return &ei->vfs_inode;
70 }
71
72 static void isofs_i_callback(struct rcu_head *head)
73 {
74 struct inode *inode = container_of(head, struct inode, i_rcu);
75 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
76 }
77
78 static void isofs_destroy_inode(struct inode *inode)
79 {
80 call_rcu(&inode->i_rcu, isofs_i_callback);
81 }
82
83 static void init_once(void *foo)
84 {
85 struct iso_inode_info *ei = foo;
86
87 inode_init_once(&ei->vfs_inode);
88 }
89
90 static int __init init_inodecache(void)
91 {
92 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
93 sizeof(struct iso_inode_info),
94 0, (SLAB_RECLAIM_ACCOUNT|
95 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
96 init_once);
97 if (isofs_inode_cachep == NULL)
98 return -ENOMEM;
99 return 0;
100 }
101
102 static void destroy_inodecache(void)
103 {
104 /*
105 * Make sure all delayed rcu free inodes are flushed before we
106 * destroy cache.
107 */
108 rcu_barrier();
109 kmem_cache_destroy(isofs_inode_cachep);
110 }
111
112 static int isofs_remount(struct super_block *sb, int *flags, char *data)
113 {
114 sync_filesystem(sb);
115 if (!(*flags & MS_RDONLY))
116 return -EROFS;
117 return 0;
118 }
119
120 static const struct super_operations isofs_sops = {
121 .alloc_inode = isofs_alloc_inode,
122 .destroy_inode = isofs_destroy_inode,
123 .put_super = isofs_put_super,
124 .statfs = isofs_statfs,
125 .remount_fs = isofs_remount,
126 .show_options = generic_show_options,
127 };
128
129
130 static const struct dentry_operations isofs_dentry_ops[] = {
131 {
132 .d_hash = isofs_hashi,
133 .d_compare = isofs_dentry_cmpi,
134 },
135 #ifdef CONFIG_JOLIET
136 {
137 .d_hash = isofs_hash_ms,
138 .d_compare = isofs_dentry_cmp_ms,
139 },
140 {
141 .d_hash = isofs_hashi_ms,
142 .d_compare = isofs_dentry_cmpi_ms,
143 },
144 #endif
145 };
146
147 struct iso9660_options{
148 unsigned int rock:1;
149 unsigned int joliet:1;
150 unsigned int cruft:1;
151 unsigned int hide:1;
152 unsigned int showassoc:1;
153 unsigned int nocompress:1;
154 unsigned int overriderockperm:1;
155 unsigned int uid_set:1;
156 unsigned int gid_set:1;
157 unsigned int utf8:1;
158 unsigned char map;
159 unsigned char check;
160 unsigned int blocksize;
161 umode_t fmode;
162 umode_t dmode;
163 kgid_t gid;
164 kuid_t uid;
165 char *iocharset;
166 /* LVE */
167 s32 session;
168 s32 sbsector;
169 };
170
171 /*
172 * Compute the hash for the isofs name corresponding to the dentry.
173 */
174 static int
175 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
176 {
177 const char *name;
178 int len;
179 char c;
180 unsigned long hash;
181
182 len = qstr->len;
183 name = qstr->name;
184 if (ms) {
185 while (len && name[len-1] == '.')
186 len--;
187 }
188
189 hash = init_name_hash(dentry);
190 while (len--) {
191 c = tolower(*name++);
192 hash = partial_name_hash(c, hash);
193 }
194 qstr->hash = end_name_hash(hash);
195
196 return 0;
197 }
198
199 /*
200 * Compare of two isofs names.
201 */
202 static int isofs_dentry_cmp_common(
203 unsigned int len, const char *str,
204 const struct qstr *name, int ms, int ci)
205 {
206 int alen, blen;
207
208 /* A filename cannot end in '.' or we treat it like it has none */
209 alen = name->len;
210 blen = len;
211 if (ms) {
212 while (alen && name->name[alen-1] == '.')
213 alen--;
214 while (blen && str[blen-1] == '.')
215 blen--;
216 }
217 if (alen == blen) {
218 if (ci) {
219 if (strncasecmp(name->name, str, alen) == 0)
220 return 0;
221 } else {
222 if (strncmp(name->name, str, alen) == 0)
223 return 0;
224 }
225 }
226 return 1;
227 }
228
229 static int
230 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
231 {
232 return isofs_hashi_common(dentry, qstr, 0);
233 }
234
235 static int
236 isofs_dentry_cmpi(const struct dentry *dentry,
237 unsigned int len, const char *str, const struct qstr *name)
238 {
239 return isofs_dentry_cmp_common(len, str, name, 0, 1);
240 }
241
242 #ifdef CONFIG_JOLIET
243 /*
244 * Compute the hash for the isofs name corresponding to the dentry.
245 */
246 static int
247 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
248 {
249 const char *name;
250 int len;
251
252 len = qstr->len;
253 name = qstr->name;
254 if (ms) {
255 while (len && name[len-1] == '.')
256 len--;
257 }
258
259 qstr->hash = full_name_hash(dentry, name, len);
260
261 return 0;
262 }
263
264 static int
265 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
266 {
267 return isofs_hash_common(dentry, qstr, 1);
268 }
269
270 static int
271 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
272 {
273 return isofs_hashi_common(dentry, qstr, 1);
274 }
275
276 static int
277 isofs_dentry_cmp_ms(const struct dentry *dentry,
278 unsigned int len, const char *str, const struct qstr *name)
279 {
280 return isofs_dentry_cmp_common(len, str, name, 1, 0);
281 }
282
283 static int
284 isofs_dentry_cmpi_ms(const struct dentry *dentry,
285 unsigned int len, const char *str, const struct qstr *name)
286 {
287 return isofs_dentry_cmp_common(len, str, name, 1, 1);
288 }
289 #endif
290
291 enum {
292 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
293 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
294 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
295 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
296 };
297
298 static const match_table_t tokens = {
299 {Opt_norock, "norock"},
300 {Opt_nojoliet, "nojoliet"},
301 {Opt_unhide, "unhide"},
302 {Opt_hide, "hide"},
303 {Opt_showassoc, "showassoc"},
304 {Opt_cruft, "cruft"},
305 {Opt_utf8, "utf8"},
306 {Opt_iocharset, "iocharset=%s"},
307 {Opt_map_a, "map=acorn"},
308 {Opt_map_a, "map=a"},
309 {Opt_map_n, "map=normal"},
310 {Opt_map_n, "map=n"},
311 {Opt_map_o, "map=off"},
312 {Opt_map_o, "map=o"},
313 {Opt_session, "session=%u"},
314 {Opt_sb, "sbsector=%u"},
315 {Opt_check_r, "check=relaxed"},
316 {Opt_check_r, "check=r"},
317 {Opt_check_s, "check=strict"},
318 {Opt_check_s, "check=s"},
319 {Opt_uid, "uid=%u"},
320 {Opt_gid, "gid=%u"},
321 {Opt_mode, "mode=%u"},
322 {Opt_dmode, "dmode=%u"},
323 {Opt_overriderockperm, "overriderockperm"},
324 {Opt_block, "block=%u"},
325 {Opt_ignore, "conv=binary"},
326 {Opt_ignore, "conv=b"},
327 {Opt_ignore, "conv=text"},
328 {Opt_ignore, "conv=t"},
329 {Opt_ignore, "conv=mtext"},
330 {Opt_ignore, "conv=m"},
331 {Opt_ignore, "conv=auto"},
332 {Opt_ignore, "conv=a"},
333 {Opt_nocompress, "nocompress"},
334 {Opt_err, NULL}
335 };
336
337 static int parse_options(char *options, struct iso9660_options *popt)
338 {
339 char *p;
340 int option;
341
342 popt->map = 'n';
343 popt->rock = 1;
344 popt->joliet = 1;
345 popt->cruft = 0;
346 popt->hide = 0;
347 popt->showassoc = 0;
348 popt->check = 'u'; /* unset */
349 popt->nocompress = 0;
350 popt->blocksize = 1024;
351 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
352 popt->uid_set = 0;
353 popt->gid_set = 0;
354 popt->gid = GLOBAL_ROOT_GID;
355 popt->uid = GLOBAL_ROOT_UID;
356 popt->iocharset = NULL;
357 popt->utf8 = 0;
358 popt->overriderockperm = 0;
359 popt->session=-1;
360 popt->sbsector=-1;
361 if (!options)
362 return 1;
363
364 while ((p = strsep(&options, ",")) != NULL) {
365 int token;
366 substring_t args[MAX_OPT_ARGS];
367 unsigned n;
368
369 if (!*p)
370 continue;
371
372 token = match_token(p, tokens, args);
373 switch (token) {
374 case Opt_norock:
375 popt->rock = 0;
376 break;
377 case Opt_nojoliet:
378 popt->joliet = 0;
379 break;
380 case Opt_hide:
381 popt->hide = 1;
382 break;
383 case Opt_unhide:
384 case Opt_showassoc:
385 popt->showassoc = 1;
386 break;
387 case Opt_cruft:
388 popt->cruft = 1;
389 break;
390 case Opt_utf8:
391 popt->utf8 = 1;
392 break;
393 #ifdef CONFIG_JOLIET
394 case Opt_iocharset:
395 popt->iocharset = match_strdup(&args[0]);
396 break;
397 #endif
398 case Opt_map_a:
399 popt->map = 'a';
400 break;
401 case Opt_map_o:
402 popt->map = 'o';
403 break;
404 case Opt_map_n:
405 popt->map = 'n';
406 break;
407 case Opt_session:
408 if (match_int(&args[0], &option))
409 return 0;
410 n = option;
411 if (n > 99)
412 return 0;
413 popt->session = n + 1;
414 break;
415 case Opt_sb:
416 if (match_int(&args[0], &option))
417 return 0;
418 popt->sbsector = option;
419 break;
420 case Opt_check_r:
421 popt->check = 'r';
422 break;
423 case Opt_check_s:
424 popt->check = 's';
425 break;
426 case Opt_ignore:
427 break;
428 case Opt_uid:
429 if (match_int(&args[0], &option))
430 return 0;
431 popt->uid = make_kuid(current_user_ns(), option);
432 if (!uid_valid(popt->uid))
433 return 0;
434 popt->uid_set = 1;
435 break;
436 case Opt_gid:
437 if (match_int(&args[0], &option))
438 return 0;
439 popt->gid = make_kgid(current_user_ns(), option);
440 if (!gid_valid(popt->gid))
441 return 0;
442 popt->gid_set = 1;
443 break;
444 case Opt_mode:
445 if (match_int(&args[0], &option))
446 return 0;
447 popt->fmode = option;
448 break;
449 case Opt_dmode:
450 if (match_int(&args[0], &option))
451 return 0;
452 popt->dmode = option;
453 break;
454 case Opt_overriderockperm:
455 popt->overriderockperm = 1;
456 break;
457 case Opt_block:
458 if (match_int(&args[0], &option))
459 return 0;
460 n = option;
461 if (n != 512 && n != 1024 && n != 2048)
462 return 0;
463 popt->blocksize = n;
464 break;
465 case Opt_nocompress:
466 popt->nocompress = 1;
467 break;
468 default:
469 return 0;
470 }
471 }
472 return 1;
473 }
474
475 /*
476 * look if the driver can tell the multi session redirection value
477 *
478 * don't change this if you don't know what you do, please!
479 * Multisession is legal only with XA disks.
480 * A non-XA disk with more than one volume descriptor may do it right, but
481 * usually is written in a nowhere standardized "multi-partition" manner.
482 * Multisession uses absolute addressing (solely the first frame of the whole
483 * track is #0), multi-partition uses relative addressing (each first frame of
484 * each track is #0), and a track is not a session.
485 *
486 * A broken CDwriter software or drive firmware does not set new standards,
487 * at least not if conflicting with the existing ones.
488 *
489 * emoenke@gwdg.de
490 */
491 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
492
493 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
494 {
495 struct cdrom_multisession ms_info;
496 unsigned int vol_desc_start;
497 struct block_device *bdev = sb->s_bdev;
498 int i;
499
500 vol_desc_start=0;
501 ms_info.addr_format=CDROM_LBA;
502 if(session >= 0 && session <= 99) {
503 struct cdrom_tocentry Te;
504 Te.cdte_track=session;
505 Te.cdte_format=CDROM_LBA;
506 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
507 if (!i) {
508 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
509 session, Te.cdte_addr.lba,
510 Te.cdte_ctrl&CDROM_DATA_TRACK);
511 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
512 return Te.cdte_addr.lba;
513 }
514
515 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
516 }
517 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
518 if (session > 0)
519 printk(KERN_ERR "ISOFS: Invalid session number\n");
520 #if 0
521 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
522 if (i==0) {
523 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
524 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
525 }
526 #endif
527 if (i==0)
528 #if WE_OBEY_THE_WRITTEN_STANDARDS
529 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
530 #endif
531 vol_desc_start=ms_info.addr.lba;
532 return vol_desc_start;
533 }
534
535 /*
536 * Check if root directory is empty (has less than 3 files).
537 *
538 * Used to detect broken CDs where ISO root directory is empty but Joliet root
539 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
540 * (and Joliet used instead) or else no files would be visible.
541 */
542 static bool rootdir_empty(struct super_block *sb, unsigned long block)
543 {
544 int offset = 0, files = 0, de_len;
545 struct iso_directory_record *de;
546 struct buffer_head *bh;
547
548 bh = sb_bread(sb, block);
549 if (!bh)
550 return true;
551 while (files < 3) {
552 de = (struct iso_directory_record *) (bh->b_data + offset);
553 de_len = *(unsigned char *) de;
554 if (de_len == 0)
555 break;
556 files++;
557 offset += de_len;
558 }
559 brelse(bh);
560 return files < 3;
561 }
562
563 /*
564 * Initialize the superblock and read the root inode.
565 *
566 * Note: a check_disk_change() has been done immediately prior
567 * to this call, so we don't need to check again.
568 */
569 static int isofs_fill_super(struct super_block *s, void *data, int silent)
570 {
571 struct buffer_head *bh = NULL, *pri_bh = NULL;
572 struct hs_primary_descriptor *h_pri = NULL;
573 struct iso_primary_descriptor *pri = NULL;
574 struct iso_supplementary_descriptor *sec = NULL;
575 struct iso_directory_record *rootp;
576 struct inode *inode;
577 struct iso9660_options opt;
578 struct isofs_sb_info *sbi;
579 unsigned long first_data_zone;
580 int joliet_level = 0;
581 int iso_blknum, block;
582 int orig_zonesize;
583 int table, error = -EINVAL;
584 unsigned int vol_desc_start;
585
586 save_mount_options(s, data);
587
588 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
589 if (!sbi)
590 return -ENOMEM;
591 s->s_fs_info = sbi;
592
593 if (!parse_options((char *)data, &opt))
594 goto out_freesbi;
595
596 /*
597 * First of all, get the hardware blocksize for this device.
598 * If we don't know what it is, or the hardware blocksize is
599 * larger than the blocksize the user specified, then use
600 * that value.
601 */
602 /*
603 * What if bugger tells us to go beyond page size?
604 */
605 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
606
607 sbi->s_high_sierra = 0; /* default is iso9660 */
608
609 vol_desc_start = (opt.sbsector != -1) ?
610 opt.sbsector : isofs_get_last_session(s,opt.session);
611
612 for (iso_blknum = vol_desc_start+16;
613 iso_blknum < vol_desc_start+100; iso_blknum++) {
614 struct hs_volume_descriptor *hdp;
615 struct iso_volume_descriptor *vdp;
616
617 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
618 if (!(bh = sb_bread(s, block)))
619 goto out_no_read;
620
621 vdp = (struct iso_volume_descriptor *)bh->b_data;
622 hdp = (struct hs_volume_descriptor *)bh->b_data;
623
624 /*
625 * Due to the overlapping physical location of the descriptors,
626 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
627 * proper identification in this case, we first check for ISO.
628 */
629 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
630 if (isonum_711(vdp->type) == ISO_VD_END)
631 break;
632 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
633 if (pri == NULL) {
634 pri = (struct iso_primary_descriptor *)vdp;
635 /* Save the buffer in case we need it ... */
636 pri_bh = bh;
637 bh = NULL;
638 }
639 }
640 #ifdef CONFIG_JOLIET
641 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
642 sec = (struct iso_supplementary_descriptor *)vdp;
643 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
644 if (opt.joliet) {
645 if (sec->escape[2] == 0x40)
646 joliet_level = 1;
647 else if (sec->escape[2] == 0x43)
648 joliet_level = 2;
649 else if (sec->escape[2] == 0x45)
650 joliet_level = 3;
651
652 printk(KERN_DEBUG "ISO 9660 Extensions: "
653 "Microsoft Joliet Level %d\n",
654 joliet_level);
655 }
656 goto root_found;
657 } else {
658 /* Unknown supplementary volume descriptor */
659 sec = NULL;
660 }
661 }
662 #endif
663 } else {
664 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
665 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
666 goto out_freebh;
667
668 sbi->s_high_sierra = 1;
669 opt.rock = 0;
670 h_pri = (struct hs_primary_descriptor *)vdp;
671 goto root_found;
672 }
673 }
674
675 /* Just skip any volume descriptors we don't recognize */
676
677 brelse(bh);
678 bh = NULL;
679 }
680 /*
681 * If we fall through, either no volume descriptor was found,
682 * or else we passed a primary descriptor looking for others.
683 */
684 if (!pri)
685 goto out_unknown_format;
686 brelse(bh);
687 bh = pri_bh;
688 pri_bh = NULL;
689
690 root_found:
691 /* We don't support read-write mounts */
692 if (!(s->s_flags & MS_RDONLY)) {
693 error = -EACCES;
694 goto out_freebh;
695 }
696
697 if (joliet_level && (pri == NULL || !opt.rock)) {
698 /* This is the case of Joliet with the norock mount flag.
699 * A disc with both Joliet and Rock Ridge is handled later
700 */
701 pri = (struct iso_primary_descriptor *) sec;
702 }
703
704 if(sbi->s_high_sierra){
705 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
706 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
707 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
708 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
709 } else {
710 if (!pri)
711 goto out_freebh;
712 rootp = (struct iso_directory_record *) pri->root_directory_record;
713 sbi->s_nzones = isonum_733(pri->volume_space_size);
714 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
715 sbi->s_max_size = isonum_733(pri->volume_space_size);
716 }
717
718 sbi->s_ninodes = 0; /* No way to figure this out easily */
719
720 orig_zonesize = sbi->s_log_zone_size;
721 /*
722 * If the zone size is smaller than the hardware sector size,
723 * this is a fatal error. This would occur if the disc drive
724 * had sectors that were 2048 bytes, but the filesystem had
725 * blocks that were 512 bytes (which should only very rarely
726 * happen.)
727 */
728 if (orig_zonesize < opt.blocksize)
729 goto out_bad_size;
730
731 /* RDE: convert log zone size to bit shift */
732 switch (sbi->s_log_zone_size) {
733 case 512: sbi->s_log_zone_size = 9; break;
734 case 1024: sbi->s_log_zone_size = 10; break;
735 case 2048: sbi->s_log_zone_size = 11; break;
736
737 default:
738 goto out_bad_zone_size;
739 }
740
741 s->s_magic = ISOFS_SUPER_MAGIC;
742
743 /*
744 * With multi-extent files, file size is only limited by the maximum
745 * size of a file system, which is 8 TB.
746 */
747 s->s_maxbytes = 0x80000000000LL;
748
749 /* Set this for reference. Its not currently used except on write
750 which we don't have .. */
751
752 first_data_zone = isonum_733(rootp->extent) +
753 isonum_711(rootp->ext_attr_length);
754 sbi->s_firstdatazone = first_data_zone;
755 #ifndef BEQUIET
756 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
757 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
758 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
759 if(sbi->s_high_sierra)
760 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
761 #endif
762
763 /*
764 * If the Joliet level is set, we _may_ decide to use the
765 * secondary descriptor, but can't be sure until after we
766 * read the root inode. But before reading the root inode
767 * we may need to change the device blocksize, and would
768 * rather release the old buffer first. So, we cache the
769 * first_data_zone value from the secondary descriptor.
770 */
771 if (joliet_level) {
772 pri = (struct iso_primary_descriptor *) sec;
773 rootp = (struct iso_directory_record *)
774 pri->root_directory_record;
775 first_data_zone = isonum_733(rootp->extent) +
776 isonum_711(rootp->ext_attr_length);
777 }
778
779 /*
780 * We're all done using the volume descriptor, and may need
781 * to change the device blocksize, so release the buffer now.
782 */
783 brelse(pri_bh);
784 brelse(bh);
785
786 /*
787 * Force the blocksize to 512 for 512 byte sectors. The file
788 * read primitives really get it wrong in a bad way if we don't
789 * do this.
790 *
791 * Note - we should never be setting the blocksize to something
792 * less than the hardware sector size for the device. If we
793 * do, we would end up having to read larger buffers and split
794 * out portions to satisfy requests.
795 *
796 * Note2- the idea here is that we want to deal with the optimal
797 * zonesize in the filesystem. If we have it set to something less,
798 * then we have horrible problems with trying to piece together
799 * bits of adjacent blocks in order to properly read directory
800 * entries. By forcing the blocksize in this way, we ensure
801 * that we will never be required to do this.
802 */
803 sb_set_blocksize(s, orig_zonesize);
804
805 sbi->s_nls_iocharset = NULL;
806
807 #ifdef CONFIG_JOLIET
808 if (joliet_level && opt.utf8 == 0) {
809 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
810 sbi->s_nls_iocharset = load_nls(p);
811 if (! sbi->s_nls_iocharset) {
812 /* Fail only if explicit charset specified */
813 if (opt.iocharset)
814 goto out_freesbi;
815 sbi->s_nls_iocharset = load_nls_default();
816 }
817 }
818 #endif
819 s->s_op = &isofs_sops;
820 s->s_export_op = &isofs_export_ops;
821 sbi->s_mapping = opt.map;
822 sbi->s_rock = (opt.rock ? 2 : 0);
823 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
824 sbi->s_cruft = opt.cruft;
825 sbi->s_hide = opt.hide;
826 sbi->s_showassoc = opt.showassoc;
827 sbi->s_uid = opt.uid;
828 sbi->s_gid = opt.gid;
829 sbi->s_uid_set = opt.uid_set;
830 sbi->s_gid_set = opt.gid_set;
831 sbi->s_utf8 = opt.utf8;
832 sbi->s_nocompress = opt.nocompress;
833 sbi->s_overriderockperm = opt.overriderockperm;
834 /*
835 * It would be incredibly stupid to allow people to mark every file
836 * on the disk as suid, so we merely allow them to set the default
837 * permissions.
838 */
839 if (opt.fmode != ISOFS_INVALID_MODE)
840 sbi->s_fmode = opt.fmode & 0777;
841 else
842 sbi->s_fmode = ISOFS_INVALID_MODE;
843 if (opt.dmode != ISOFS_INVALID_MODE)
844 sbi->s_dmode = opt.dmode & 0777;
845 else
846 sbi->s_dmode = ISOFS_INVALID_MODE;
847
848 /*
849 * Read the root inode, which _may_ result in changing
850 * the s_rock flag. Once we have the final s_rock value,
851 * we then decide whether to use the Joliet descriptor.
852 */
853 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
854 if (IS_ERR(inode))
855 goto out_no_root;
856
857 /*
858 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
859 * correct Joliet root directory.
860 */
861 if (sbi->s_rock == 1 && joliet_level &&
862 rootdir_empty(s, sbi->s_firstdatazone)) {
863 printk(KERN_NOTICE
864 "ISOFS: primary root directory is empty. "
865 "Disabling Rock Ridge and switching to Joliet.");
866 sbi->s_rock = 0;
867 }
868
869 /*
870 * If this disk has both Rock Ridge and Joliet on it, then we
871 * want to use Rock Ridge by default. This can be overridden
872 * by using the norock mount option. There is still one other
873 * possibility that is not taken into account: a Rock Ridge
874 * CD with Unicode names. Until someone sees such a beast, it
875 * will not be supported.
876 */
877 if (sbi->s_rock == 1) {
878 joliet_level = 0;
879 } else if (joliet_level) {
880 sbi->s_rock = 0;
881 if (sbi->s_firstdatazone != first_data_zone) {
882 sbi->s_firstdatazone = first_data_zone;
883 printk(KERN_DEBUG
884 "ISOFS: changing to secondary root\n");
885 iput(inode);
886 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
887 if (IS_ERR(inode))
888 goto out_no_root;
889 }
890 }
891
892 if (opt.check == 'u') {
893 /* Only Joliet is case insensitive by default */
894 if (joliet_level)
895 opt.check = 'r';
896 else
897 opt.check = 's';
898 }
899 sbi->s_joliet_level = joliet_level;
900
901 /* Make sure the root inode is a directory */
902 if (!S_ISDIR(inode->i_mode)) {
903 printk(KERN_WARNING
904 "isofs_fill_super: root inode is not a directory. "
905 "Corrupted media?\n");
906 goto out_iput;
907 }
908
909 table = 0;
910 if (joliet_level)
911 table += 2;
912 if (opt.check == 'r')
913 table++;
914
915 if (table)
916 s->s_d_op = &isofs_dentry_ops[table - 1];
917
918 /* get the root dentry */
919 s->s_root = d_make_root(inode);
920 if (!(s->s_root)) {
921 error = -ENOMEM;
922 goto out_no_inode;
923 }
924
925 kfree(opt.iocharset);
926
927 return 0;
928
929 /*
930 * Display error messages and free resources.
931 */
932 out_iput:
933 iput(inode);
934 goto out_no_inode;
935 out_no_root:
936 error = PTR_ERR(inode);
937 if (error != -ENOMEM)
938 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
939 out_no_inode:
940 #ifdef CONFIG_JOLIET
941 unload_nls(sbi->s_nls_iocharset);
942 #endif
943 goto out_freesbi;
944 out_no_read:
945 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
946 __func__, s->s_id, iso_blknum, block);
947 goto out_freebh;
948 out_bad_zone_size:
949 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
950 sbi->s_log_zone_size);
951 goto out_freebh;
952 out_bad_size:
953 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
954 orig_zonesize, opt.blocksize);
955 goto out_freebh;
956 out_unknown_format:
957 if (!silent)
958 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
959
960 out_freebh:
961 brelse(bh);
962 brelse(pri_bh);
963 out_freesbi:
964 kfree(opt.iocharset);
965 kfree(sbi);
966 s->s_fs_info = NULL;
967 return error;
968 }
969
970 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
971 {
972 struct super_block *sb = dentry->d_sb;
973 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
974
975 buf->f_type = ISOFS_SUPER_MAGIC;
976 buf->f_bsize = sb->s_blocksize;
977 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
978 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
979 buf->f_bfree = 0;
980 buf->f_bavail = 0;
981 buf->f_files = ISOFS_SB(sb)->s_ninodes;
982 buf->f_ffree = 0;
983 buf->f_fsid.val[0] = (u32)id;
984 buf->f_fsid.val[1] = (u32)(id >> 32);
985 buf->f_namelen = NAME_MAX;
986 return 0;
987 }
988
989 /*
990 * Get a set of blocks; filling in buffer_heads if already allocated
991 * or getblk() if they are not. Returns the number of blocks inserted
992 * (-ve == error.)
993 */
994 int isofs_get_blocks(struct inode *inode, sector_t iblock,
995 struct buffer_head **bh, unsigned long nblocks)
996 {
997 unsigned long b_off = iblock;
998 unsigned offset, sect_size;
999 unsigned int firstext;
1000 unsigned long nextblk, nextoff;
1001 int section, rv, error;
1002 struct iso_inode_info *ei = ISOFS_I(inode);
1003
1004 error = -EIO;
1005 rv = 0;
1006 if (iblock != b_off) {
1007 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1008 goto abort;
1009 }
1010
1011
1012 offset = 0;
1013 firstext = ei->i_first_extent;
1014 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1015 nextblk = ei->i_next_section_block;
1016 nextoff = ei->i_next_section_offset;
1017 section = 0;
1018
1019 while (nblocks) {
1020 /* If we are *way* beyond the end of the file, print a message.
1021 * Access beyond the end of the file up to the next page boundary
1022 * is normal, however because of the way the page cache works.
1023 * In this case, we just return 0 so that we can properly fill
1024 * the page with useless information without generating any
1025 * I/O errors.
1026 */
1027 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1028 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1029 __func__, b_off,
1030 (unsigned long long)inode->i_size);
1031 goto abort;
1032 }
1033
1034 /* On the last section, nextblk == 0, section size is likely to
1035 * exceed sect_size by a partial block, and access beyond the
1036 * end of the file will reach beyond the section size, too.
1037 */
1038 while (nextblk && (b_off >= (offset + sect_size))) {
1039 struct inode *ninode;
1040
1041 offset += sect_size;
1042 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1043 if (IS_ERR(ninode)) {
1044 error = PTR_ERR(ninode);
1045 goto abort;
1046 }
1047 firstext = ISOFS_I(ninode)->i_first_extent;
1048 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1049 nextblk = ISOFS_I(ninode)->i_next_section_block;
1050 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1051 iput(ninode);
1052
1053 if (++section > 100) {
1054 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1055 " aborting...\n", __func__);
1056 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1057 "nextblk=%lu nextoff=%lu\n", __func__,
1058 b_off, firstext, (unsigned) sect_size,
1059 nextblk, nextoff);
1060 goto abort;
1061 }
1062 }
1063
1064 if (*bh) {
1065 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1066 } else {
1067 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1068 if (!*bh)
1069 goto abort;
1070 }
1071 bh++; /* Next buffer head */
1072 b_off++; /* Next buffer offset */
1073 nblocks--;
1074 rv++;
1075 }
1076
1077 error = 0;
1078 abort:
1079 return rv != 0 ? rv : error;
1080 }
1081
1082 /*
1083 * Used by the standard interfaces.
1084 */
1085 static int isofs_get_block(struct inode *inode, sector_t iblock,
1086 struct buffer_head *bh_result, int create)
1087 {
1088 int ret;
1089
1090 if (create) {
1091 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1092 return -EROFS;
1093 }
1094
1095 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1096 return ret < 0 ? ret : 0;
1097 }
1098
1099 static int isofs_bmap(struct inode *inode, sector_t block)
1100 {
1101 struct buffer_head dummy;
1102 int error;
1103
1104 dummy.b_state = 0;
1105 dummy.b_blocknr = -1000;
1106 error = isofs_get_block(inode, block, &dummy, 0);
1107 if (!error)
1108 return dummy.b_blocknr;
1109 return 0;
1110 }
1111
1112 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1113 {
1114 sector_t blknr = isofs_bmap(inode, block);
1115 if (!blknr)
1116 return NULL;
1117 return sb_bread(inode->i_sb, blknr);
1118 }
1119
1120 static int isofs_readpage(struct file *file, struct page *page)
1121 {
1122 return mpage_readpage(page, isofs_get_block);
1123 }
1124
1125 static int isofs_readpages(struct file *file, struct address_space *mapping,
1126 struct list_head *pages, unsigned nr_pages)
1127 {
1128 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1129 }
1130
1131 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1132 {
1133 return generic_block_bmap(mapping,block,isofs_get_block);
1134 }
1135
1136 static const struct address_space_operations isofs_aops = {
1137 .readpage = isofs_readpage,
1138 .readpages = isofs_readpages,
1139 .bmap = _isofs_bmap
1140 };
1141
1142 static int isofs_read_level3_size(struct inode *inode)
1143 {
1144 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1145 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1146 struct buffer_head *bh = NULL;
1147 unsigned long block, offset, block_saved, offset_saved;
1148 int i = 0;
1149 int more_entries = 0;
1150 struct iso_directory_record *tmpde = NULL;
1151 struct iso_inode_info *ei = ISOFS_I(inode);
1152
1153 inode->i_size = 0;
1154
1155 /* The first 16 blocks are reserved as the System Area. Thus,
1156 * no inodes can appear in block 0. We use this to flag that
1157 * this is the last section. */
1158 ei->i_next_section_block = 0;
1159 ei->i_next_section_offset = 0;
1160
1161 block = ei->i_iget5_block;
1162 offset = ei->i_iget5_offset;
1163
1164 do {
1165 struct iso_directory_record *de;
1166 unsigned int de_len;
1167
1168 if (!bh) {
1169 bh = sb_bread(inode->i_sb, block);
1170 if (!bh)
1171 goto out_noread;
1172 }
1173 de = (struct iso_directory_record *) (bh->b_data + offset);
1174 de_len = *(unsigned char *) de;
1175
1176 if (de_len == 0) {
1177 brelse(bh);
1178 bh = NULL;
1179 ++block;
1180 offset = 0;
1181 continue;
1182 }
1183
1184 block_saved = block;
1185 offset_saved = offset;
1186 offset += de_len;
1187
1188 /* Make sure we have a full directory entry */
1189 if (offset >= bufsize) {
1190 int slop = bufsize - offset + de_len;
1191 if (!tmpde) {
1192 tmpde = kmalloc(256, GFP_KERNEL);
1193 if (!tmpde)
1194 goto out_nomem;
1195 }
1196 memcpy(tmpde, de, slop);
1197 offset &= bufsize - 1;
1198 block++;
1199 brelse(bh);
1200 bh = NULL;
1201 if (offset) {
1202 bh = sb_bread(inode->i_sb, block);
1203 if (!bh)
1204 goto out_noread;
1205 memcpy((void *)tmpde+slop, bh->b_data, offset);
1206 }
1207 de = tmpde;
1208 }
1209
1210 inode->i_size += isonum_733(de->size);
1211 if (i == 1) {
1212 ei->i_next_section_block = block_saved;
1213 ei->i_next_section_offset = offset_saved;
1214 }
1215
1216 more_entries = de->flags[-high_sierra] & 0x80;
1217
1218 i++;
1219 if (i > 100)
1220 goto out_toomany;
1221 } while (more_entries);
1222 out:
1223 kfree(tmpde);
1224 if (bh)
1225 brelse(bh);
1226 return 0;
1227
1228 out_nomem:
1229 if (bh)
1230 brelse(bh);
1231 return -ENOMEM;
1232
1233 out_noread:
1234 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1235 kfree(tmpde);
1236 return -EIO;
1237
1238 out_toomany:
1239 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1240 "isofs_read_level3_size: inode=%lu\n",
1241 __func__, inode->i_ino);
1242 goto out;
1243 }
1244
1245 static int isofs_read_inode(struct inode *inode, int relocated)
1246 {
1247 struct super_block *sb = inode->i_sb;
1248 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1249 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1250 unsigned long block;
1251 int high_sierra = sbi->s_high_sierra;
1252 struct buffer_head *bh = NULL;
1253 struct iso_directory_record *de;
1254 struct iso_directory_record *tmpde = NULL;
1255 unsigned int de_len;
1256 unsigned long offset;
1257 struct iso_inode_info *ei = ISOFS_I(inode);
1258 int ret = -EIO;
1259
1260 block = ei->i_iget5_block;
1261 bh = sb_bread(inode->i_sb, block);
1262 if (!bh)
1263 goto out_badread;
1264
1265 offset = ei->i_iget5_offset;
1266
1267 de = (struct iso_directory_record *) (bh->b_data + offset);
1268 de_len = *(unsigned char *) de;
1269
1270 if (offset + de_len > bufsize) {
1271 int frag1 = bufsize - offset;
1272
1273 tmpde = kmalloc(de_len, GFP_KERNEL);
1274 if (tmpde == NULL) {
1275 printk(KERN_INFO "%s: out of memory\n", __func__);
1276 ret = -ENOMEM;
1277 goto fail;
1278 }
1279 memcpy(tmpde, bh->b_data + offset, frag1);
1280 brelse(bh);
1281 bh = sb_bread(inode->i_sb, ++block);
1282 if (!bh)
1283 goto out_badread;
1284 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1285 de = tmpde;
1286 }
1287
1288 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1289 ei->i_iget5_offset,
1290 ISOFS_BUFFER_BITS(inode));
1291
1292 /* Assume it is a normal-format file unless told otherwise */
1293 ei->i_file_format = isofs_file_normal;
1294
1295 if (de->flags[-high_sierra] & 2) {
1296 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1297 inode->i_mode = S_IFDIR | sbi->s_dmode;
1298 else
1299 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1300 set_nlink(inode, 1); /*
1301 * Set to 1. We know there are 2, but
1302 * the find utility tries to optimize
1303 * if it is 2, and it screws up. It is
1304 * easier to give 1 which tells find to
1305 * do it the hard way.
1306 */
1307 } else {
1308 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1309 inode->i_mode = S_IFREG | sbi->s_fmode;
1310 } else {
1311 /*
1312 * Set default permissions: r-x for all. The disc
1313 * could be shared with DOS machines so virtually
1314 * anything could be a valid executable.
1315 */
1316 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1317 }
1318 set_nlink(inode, 1);
1319 }
1320 inode->i_uid = sbi->s_uid;
1321 inode->i_gid = sbi->s_gid;
1322 inode->i_blocks = 0;
1323
1324 ei->i_format_parm[0] = 0;
1325 ei->i_format_parm[1] = 0;
1326 ei->i_format_parm[2] = 0;
1327
1328 ei->i_section_size = isonum_733(de->size);
1329 if (de->flags[-high_sierra] & 0x80) {
1330 ret = isofs_read_level3_size(inode);
1331 if (ret < 0)
1332 goto fail;
1333 ret = -EIO;
1334 } else {
1335 ei->i_next_section_block = 0;
1336 ei->i_next_section_offset = 0;
1337 inode->i_size = isonum_733(de->size);
1338 }
1339
1340 /*
1341 * Some dipshit decided to store some other bit of information
1342 * in the high byte of the file length. Truncate size in case
1343 * this CDROM was mounted with the cruft option.
1344 */
1345
1346 if (sbi->s_cruft)
1347 inode->i_size &= 0x00ffffff;
1348
1349 if (de->interleave[0]) {
1350 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1351 inode->i_size = 0;
1352 }
1353
1354 /* I have no idea what file_unit_size is used for, so
1355 we will flag it for now */
1356 if (de->file_unit_size[0] != 0) {
1357 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1358 inode->i_ino);
1359 }
1360
1361 /* I have no idea what other flag bits are used for, so
1362 we will flag it for now */
1363 #ifdef DEBUG
1364 if((de->flags[-high_sierra] & ~2)!= 0){
1365 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1366 "(%ld %x).\n",
1367 inode->i_ino, de->flags[-high_sierra]);
1368 }
1369 #endif
1370
1371 inode->i_mtime.tv_sec =
1372 inode->i_atime.tv_sec =
1373 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1374 inode->i_mtime.tv_nsec =
1375 inode->i_atime.tv_nsec =
1376 inode->i_ctime.tv_nsec = 0;
1377
1378 ei->i_first_extent = (isonum_733(de->extent) +
1379 isonum_711(de->ext_attr_length));
1380
1381 /* Set the number of blocks for stat() - should be done before RR */
1382 inode->i_blocks = (inode->i_size + 511) >> 9;
1383
1384 /*
1385 * Now test for possible Rock Ridge extensions which will override
1386 * some of these numbers in the inode structure.
1387 */
1388
1389 if (!high_sierra) {
1390 parse_rock_ridge_inode(de, inode, relocated);
1391 /* if we want uid/gid set, override the rock ridge setting */
1392 if (sbi->s_uid_set)
1393 inode->i_uid = sbi->s_uid;
1394 if (sbi->s_gid_set)
1395 inode->i_gid = sbi->s_gid;
1396 }
1397 /* Now set final access rights if overriding rock ridge setting */
1398 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1399 sbi->s_dmode != ISOFS_INVALID_MODE)
1400 inode->i_mode = S_IFDIR | sbi->s_dmode;
1401 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1402 sbi->s_fmode != ISOFS_INVALID_MODE)
1403 inode->i_mode = S_IFREG | sbi->s_fmode;
1404
1405 /* Install the inode operations vector */
1406 if (S_ISREG(inode->i_mode)) {
1407 inode->i_fop = &generic_ro_fops;
1408 switch (ei->i_file_format) {
1409 #ifdef CONFIG_ZISOFS
1410 case isofs_file_compressed:
1411 inode->i_data.a_ops = &zisofs_aops;
1412 break;
1413 #endif
1414 default:
1415 inode->i_data.a_ops = &isofs_aops;
1416 break;
1417 }
1418 } else if (S_ISDIR(inode->i_mode)) {
1419 inode->i_op = &isofs_dir_inode_operations;
1420 inode->i_fop = &isofs_dir_operations;
1421 } else if (S_ISLNK(inode->i_mode)) {
1422 inode->i_op = &page_symlink_inode_operations;
1423 inode_nohighmem(inode);
1424 inode->i_data.a_ops = &isofs_symlink_aops;
1425 } else
1426 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1427 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1428
1429 ret = 0;
1430 out:
1431 kfree(tmpde);
1432 if (bh)
1433 brelse(bh);
1434 return ret;
1435
1436 out_badread:
1437 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1438 fail:
1439 goto out;
1440 }
1441
1442 struct isofs_iget5_callback_data {
1443 unsigned long block;
1444 unsigned long offset;
1445 };
1446
1447 static int isofs_iget5_test(struct inode *ino, void *data)
1448 {
1449 struct iso_inode_info *i = ISOFS_I(ino);
1450 struct isofs_iget5_callback_data *d =
1451 (struct isofs_iget5_callback_data*)data;
1452 return (i->i_iget5_block == d->block)
1453 && (i->i_iget5_offset == d->offset);
1454 }
1455
1456 static int isofs_iget5_set(struct inode *ino, void *data)
1457 {
1458 struct iso_inode_info *i = ISOFS_I(ino);
1459 struct isofs_iget5_callback_data *d =
1460 (struct isofs_iget5_callback_data*)data;
1461 i->i_iget5_block = d->block;
1462 i->i_iget5_offset = d->offset;
1463 return 0;
1464 }
1465
1466 /* Store, in the inode's containing structure, the block and block
1467 * offset that point to the underlying meta-data for the inode. The
1468 * code below is otherwise similar to the iget() code in
1469 * include/linux/fs.h */
1470 struct inode *__isofs_iget(struct super_block *sb,
1471 unsigned long block,
1472 unsigned long offset,
1473 int relocated)
1474 {
1475 unsigned long hashval;
1476 struct inode *inode;
1477 struct isofs_iget5_callback_data data;
1478 long ret;
1479
1480 if (offset >= 1ul << sb->s_blocksize_bits)
1481 return ERR_PTR(-EINVAL);
1482
1483 data.block = block;
1484 data.offset = offset;
1485
1486 hashval = (block << sb->s_blocksize_bits) | offset;
1487
1488 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1489 &isofs_iget5_set, &data);
1490
1491 if (!inode)
1492 return ERR_PTR(-ENOMEM);
1493
1494 if (inode->i_state & I_NEW) {
1495 ret = isofs_read_inode(inode, relocated);
1496 if (ret < 0) {
1497 iget_failed(inode);
1498 inode = ERR_PTR(ret);
1499 } else {
1500 unlock_new_inode(inode);
1501 }
1502 }
1503
1504 return inode;
1505 }
1506
1507 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1508 int flags, const char *dev_name, void *data)
1509 {
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 with added FPC-III support