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Linux 4.8-rc8
[linux/fpc-iii.git] / fs / isofs / inode.c
blobad0c745ebad72e89fd987e0f67de5e61f525ff2a
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 *dentry,
33 unsigned int len, const char *str, const struct qstr *name);
34
35 #ifdef CONFIG_JOLIET
36 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
37 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
38 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
39 unsigned int len, const char *str, const struct qstr *name);
40 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
41 unsigned int len, const char *str, const struct qstr *name);
42 #endif
43
44 static void isofs_put_super(struct super_block *sb)
45 {
46 struct isofs_sb_info *sbi = ISOFS_SB(sb);
47
48 #ifdef CONFIG_JOLIET
49 unload_nls(sbi->s_nls_iocharset);
50 #endif
51
52 kfree(sbi);
53 sb->s_fs_info = NULL;
54 return;
55 }
56
57 static int isofs_read_inode(struct inode *, int relocated);
58 static int isofs_statfs (struct dentry *, struct kstatfs *);
59
60 static struct kmem_cache *isofs_inode_cachep;
61
62 static struct inode *isofs_alloc_inode(struct super_block *sb)
63 {
64 struct iso_inode_info *ei;
65 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
66 if (!ei)
67 return NULL;
68 return &ei->vfs_inode;
69 }
70
71 static void isofs_i_callback(struct rcu_head *head)
72 {
73 struct inode *inode = container_of(head, struct inode, i_rcu);
74 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
75 }
76
77 static void isofs_destroy_inode(struct inode *inode)
78 {
79 call_rcu(&inode->i_rcu, isofs_i_callback);
80 }
81
82 static void init_once(void *foo)
83 {
84 struct iso_inode_info *ei = foo;
85
86 inode_init_once(&ei->vfs_inode);
87 }
88
89 static int __init init_inodecache(void)
90 {
91 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
92 sizeof(struct iso_inode_info),
93 0, (SLAB_RECLAIM_ACCOUNT|
94 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
95 init_once);
96 if (isofs_inode_cachep == NULL)
97 return -ENOMEM;
98 return 0;
99 }
100
101 static void destroy_inodecache(void)
102 {
103 /*
104 * Make sure all delayed rcu free inodes are flushed before we
105 * destroy cache.
106 */
107 rcu_barrier();
108 kmem_cache_destroy(isofs_inode_cachep);
109 }
110
111 static int isofs_remount(struct super_block *sb, int *flags, char *data)
112 {
113 sync_filesystem(sb);
114 if (!(*flags & MS_RDONLY))
115 return -EROFS;
116 return 0;
117 }
118
119 static const struct super_operations isofs_sops = {
120 .alloc_inode = isofs_alloc_inode,
121 .destroy_inode = isofs_destroy_inode,
122 .put_super = isofs_put_super,
123 .statfs = isofs_statfs,
124 .remount_fs = isofs_remount,
125 .show_options = generic_show_options,
126 };
127
128
129 static const struct dentry_operations isofs_dentry_ops[] = {
130 {
131 .d_hash = isofs_hashi,
132 .d_compare = isofs_dentry_cmpi,
133 },
134 #ifdef CONFIG_JOLIET
135 {
136 .d_hash = isofs_hash_ms,
137 .d_compare = isofs_dentry_cmp_ms,
138 },
139 {
140 .d_hash = isofs_hashi_ms,
141 .d_compare = isofs_dentry_cmpi_ms,
142 },
143 #endif
144 };
145
146 struct iso9660_options{
147 unsigned int rock:1;
148 unsigned int joliet:1;
149 unsigned int cruft:1;
150 unsigned int hide:1;
151 unsigned int showassoc:1;
152 unsigned int nocompress:1;
153 unsigned int overriderockperm:1;
154 unsigned int uid_set:1;
155 unsigned int gid_set:1;
156 unsigned int utf8:1;
157 unsigned char map;
158 unsigned char check;
159 unsigned int blocksize;
160 umode_t fmode;
161 umode_t dmode;
162 kgid_t gid;
163 kuid_t uid;
164 char *iocharset;
165 /* LVE */
166 s32 session;
167 s32 sbsector;
168 };
169
170 /*
171 * Compute the hash for the isofs name corresponding to the dentry.
172 */
173 static int
174 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
175 {
176 const char *name;
177 int len;
178 char c;
179 unsigned long hash;
180
181 len = qstr->len;
182 name = qstr->name;
183 if (ms) {
184 while (len && name[len-1] == '.')
185 len--;
186 }
187
188 hash = init_name_hash(dentry);
189 while (len--) {
190 c = tolower(*name++);
191 hash = partial_name_hash(c, hash);
192 }
193 qstr->hash = end_name_hash(hash);
194
195 return 0;
196 }
197
198 /*
199 * Compare of two isofs names.
200 */
201 static int isofs_dentry_cmp_common(
202 unsigned int len, const char *str,
203 const struct qstr *name, int ms, int ci)
204 {
205 int alen, blen;
206
207 /* A filename cannot end in '.' or we treat it like it has none */
208 alen = name->len;
209 blen = len;
210 if (ms) {
211 while (alen && name->name[alen-1] == '.')
212 alen--;
213 while (blen && str[blen-1] == '.')
214 blen--;
215 }
216 if (alen == blen) {
217 if (ci) {
218 if (strncasecmp(name->name, str, alen) == 0)
219 return 0;
220 } else {
221 if (strncmp(name->name, str, alen) == 0)
222 return 0;
223 }
224 }
225 return 1;
226 }
227
228 static int
229 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
230 {
231 return isofs_hashi_common(dentry, qstr, 0);
232 }
233
234 static int
235 isofs_dentry_cmpi(const struct dentry *dentry,
236 unsigned int len, const char *str, const struct qstr *name)
237 {
238 return isofs_dentry_cmp_common(len, str, name, 0, 1);
239 }
240
241 #ifdef CONFIG_JOLIET
242 /*
243 * Compute the hash for the isofs name corresponding to the dentry.
244 */
245 static int
246 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
247 {
248 const char *name;
249 int len;
250
251 len = qstr->len;
252 name = qstr->name;
253 if (ms) {
254 while (len && name[len-1] == '.')
255 len--;
256 }
257
258 qstr->hash = full_name_hash(dentry, name, len);
259
260 return 0;
261 }
262
263 static int
264 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
265 {
266 return isofs_hash_common(dentry, qstr, 1);
267 }
268
269 static int
270 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
271 {
272 return isofs_hashi_common(dentry, qstr, 1);
273 }
274
275 static int
276 isofs_dentry_cmp_ms(const struct dentry *dentry,
277 unsigned int len, const char *str, const struct qstr *name)
278 {
279 return isofs_dentry_cmp_common(len, str, name, 1, 0);
280 }
281
282 static int
283 isofs_dentry_cmpi_ms(const struct dentry *dentry,
284 unsigned int len, const char *str, const struct qstr *name)
285 {
286 return isofs_dentry_cmp_common(len, str, name, 1, 1);
287 }
288 #endif
289
290 enum {
291 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
292 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
293 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
294 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
295 };
296
297 static const match_table_t tokens = {
298 {Opt_norock, "norock"},
299 {Opt_nojoliet, "nojoliet"},
300 {Opt_unhide, "unhide"},
301 {Opt_hide, "hide"},
302 {Opt_showassoc, "showassoc"},
303 {Opt_cruft, "cruft"},
304 {Opt_utf8, "utf8"},
305 {Opt_iocharset, "iocharset=%s"},
306 {Opt_map_a, "map=acorn"},
307 {Opt_map_a, "map=a"},
308 {Opt_map_n, "map=normal"},
309 {Opt_map_n, "map=n"},
310 {Opt_map_o, "map=off"},
311 {Opt_map_o, "map=o"},
312 {Opt_session, "session=%u"},
313 {Opt_sb, "sbsector=%u"},
314 {Opt_check_r, "check=relaxed"},
315 {Opt_check_r, "check=r"},
316 {Opt_check_s, "check=strict"},
317 {Opt_check_s, "check=s"},
318 {Opt_uid, "uid=%u"},
319 {Opt_gid, "gid=%u"},
320 {Opt_mode, "mode=%u"},
321 {Opt_dmode, "dmode=%u"},
322 {Opt_overriderockperm, "overriderockperm"},
323 {Opt_block, "block=%u"},
324 {Opt_ignore, "conv=binary"},
325 {Opt_ignore, "conv=b"},
326 {Opt_ignore, "conv=text"},
327 {Opt_ignore, "conv=t"},
328 {Opt_ignore, "conv=mtext"},
329 {Opt_ignore, "conv=m"},
330 {Opt_ignore, "conv=auto"},
331 {Opt_ignore, "conv=a"},
332 {Opt_nocompress, "nocompress"},
333 {Opt_err, NULL}
334 };
335
336 static int parse_options(char *options, struct iso9660_options *popt)
337 {
338 char *p;
339 int option;
340
341 popt->map = 'n';
342 popt->rock = 1;
343 popt->joliet = 1;
344 popt->cruft = 0;
345 popt->hide = 0;
346 popt->showassoc = 0;
347 popt->check = 'u'; /* unset */
348 popt->nocompress = 0;
349 popt->blocksize = 1024;
350 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
351 popt->uid_set = 0;
352 popt->gid_set = 0;
353 popt->gid = GLOBAL_ROOT_GID;
354 popt->uid = GLOBAL_ROOT_UID;
355 popt->iocharset = NULL;
356 popt->utf8 = 0;
357 popt->overriderockperm = 0;
358 popt->session=-1;
359 popt->sbsector=-1;
360 if (!options)
361 return 1;
362
363 while ((p = strsep(&options, ",")) != NULL) {
364 int token;
365 substring_t args[MAX_OPT_ARGS];
366 unsigned n;
367
368 if (!*p)
369 continue;
370
371 token = match_token(p, tokens, args);
372 switch (token) {
373 case Opt_norock:
374 popt->rock = 0;
375 break;
376 case Opt_nojoliet:
377 popt->joliet = 0;
378 break;
379 case Opt_hide:
380 popt->hide = 1;
381 break;
382 case Opt_unhide:
383 case Opt_showassoc:
384 popt->showassoc = 1;
385 break;
386 case Opt_cruft:
387 popt->cruft = 1;
388 break;
389 case Opt_utf8:
390 popt->utf8 = 1;
391 break;
392 #ifdef CONFIG_JOLIET
393 case Opt_iocharset:
394 popt->iocharset = match_strdup(&args[0]);
395 break;
396 #endif
397 case Opt_map_a:
398 popt->map = 'a';
399 break;
400 case Opt_map_o:
401 popt->map = 'o';
402 break;
403 case Opt_map_n:
404 popt->map = 'n';
405 break;
406 case Opt_session:
407 if (match_int(&args[0], &option))
408 return 0;
409 n = option;
410 if (n > 99)
411 return 0;
412 popt->session = n + 1;
413 break;
414 case Opt_sb:
415 if (match_int(&args[0], &option))
416 return 0;
417 popt->sbsector = option;
418 break;
419 case Opt_check_r:
420 popt->check = 'r';
421 break;
422 case Opt_check_s:
423 popt->check = 's';
424 break;
425 case Opt_ignore:
426 break;
427 case Opt_uid:
428 if (match_int(&args[0], &option))
429 return 0;
430 popt->uid = make_kuid(current_user_ns(), option);
431 if (!uid_valid(popt->uid))
432 return 0;
433 popt->uid_set = 1;
434 break;
435 case Opt_gid:
436 if (match_int(&args[0], &option))
437 return 0;
438 popt->gid = make_kgid(current_user_ns(), option);
439 if (!gid_valid(popt->gid))
440 return 0;
441 popt->gid_set = 1;
442 break;
443 case Opt_mode:
444 if (match_int(&args[0], &option))
445 return 0;
446 popt->fmode = option;
447 break;
448 case Opt_dmode:
449 if (match_int(&args[0], &option))
450 return 0;
451 popt->dmode = option;
452 break;
453 case Opt_overriderockperm:
454 popt->overriderockperm = 1;
455 break;
456 case Opt_block:
457 if (match_int(&args[0], &option))
458 return 0;
459 n = option;
460 if (n != 512 && n != 1024 && n != 2048)
461 return 0;
462 popt->blocksize = n;
463 break;
464 case Opt_nocompress:
465 popt->nocompress = 1;
466 break;
467 default:
468 return 0;
469 }
470 }
471 return 1;
472 }
473
474 /*
475 * look if the driver can tell the multi session redirection value
476 *
477 * don't change this if you don't know what you do, please!
478 * Multisession is legal only with XA disks.
479 * A non-XA disk with more than one volume descriptor may do it right, but
480 * usually is written in a nowhere standardized "multi-partition" manner.
481 * Multisession uses absolute addressing (solely the first frame of the whole
482 * track is #0), multi-partition uses relative addressing (each first frame of
483 * each track is #0), and a track is not a session.
484 *
485 * A broken CDwriter software or drive firmware does not set new standards,
486 * at least not if conflicting with the existing ones.
487 *
488 * emoenke@gwdg.de
489 */
490 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
491
492 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
493 {
494 struct cdrom_multisession ms_info;
495 unsigned int vol_desc_start;
496 struct block_device *bdev = sb->s_bdev;
497 int i;
498
499 vol_desc_start=0;
500 ms_info.addr_format=CDROM_LBA;
501 if(session >= 0 && session <= 99) {
502 struct cdrom_tocentry Te;
503 Te.cdte_track=session;
504 Te.cdte_format=CDROM_LBA;
505 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
506 if (!i) {
507 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
508 session, Te.cdte_addr.lba,
509 Te.cdte_ctrl&CDROM_DATA_TRACK);
510 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
511 return Te.cdte_addr.lba;
512 }
513
514 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
515 }
516 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
517 if (session > 0)
518 printk(KERN_ERR "ISOFS: Invalid session number\n");
519 #if 0
520 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
521 if (i==0) {
522 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
523 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
524 }
525 #endif
526 if (i==0)
527 #if WE_OBEY_THE_WRITTEN_STANDARDS
528 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
529 #endif
530 vol_desc_start=ms_info.addr.lba;
531 return vol_desc_start;
532 }
533
534 /*
535 * Check if root directory is empty (has less than 3 files).
536 *
537 * Used to detect broken CDs where ISO root directory is empty but Joliet root
538 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
539 * (and Joliet used instead) or else no files would be visible.
540 */
541 static bool rootdir_empty(struct super_block *sb, unsigned long block)
542 {
543 int offset = 0, files = 0, de_len;
544 struct iso_directory_record *de;
545 struct buffer_head *bh;
546
547 bh = sb_bread(sb, block);
548 if (!bh)
549 return true;
550 while (files < 3) {
551 de = (struct iso_directory_record *) (bh->b_data + offset);
552 de_len = *(unsigned char *) de;
553 if (de_len == 0)
554 break;
555 files++;
556 offset += de_len;
557 }
558 brelse(bh);
559 return files < 3;
560 }
561
562 /*
563 * Initialize the superblock and read the root inode.
564 *
565 * Note: a check_disk_change() has been done immediately prior
566 * to this call, so we don't need to check again.
567 */
568 static int isofs_fill_super(struct super_block *s, void *data, int silent)
569 {
570 struct buffer_head *bh = NULL, *pri_bh = NULL;
571 struct hs_primary_descriptor *h_pri = NULL;
572 struct iso_primary_descriptor *pri = NULL;
573 struct iso_supplementary_descriptor *sec = NULL;
574 struct iso_directory_record *rootp;
575 struct inode *inode;
576 struct iso9660_options opt;
577 struct isofs_sb_info *sbi;
578 unsigned long first_data_zone;
579 int joliet_level = 0;
580 int iso_blknum, block;
581 int orig_zonesize;
582 int table, error = -EINVAL;
583 unsigned int vol_desc_start;
584
585 save_mount_options(s, data);
586
587 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
588 if (!sbi)
589 return -ENOMEM;
590 s->s_fs_info = sbi;
591
592 if (!parse_options((char *)data, &opt))
593 goto out_freesbi;
594
595 /*
596 * First of all, get the hardware blocksize for this device.
597 * If we don't know what it is, or the hardware blocksize is
598 * larger than the blocksize the user specified, then use
599 * that value.
600 */
601 /*
602 * What if bugger tells us to go beyond page size?
603 */
604 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
605
606 sbi->s_high_sierra = 0; /* default is iso9660 */
607
608 vol_desc_start = (opt.sbsector != -1) ?
609 opt.sbsector : isofs_get_last_session(s,opt.session);
610
611 for (iso_blknum = vol_desc_start+16;
612 iso_blknum < vol_desc_start+100; iso_blknum++) {
613 struct hs_volume_descriptor *hdp;
614 struct iso_volume_descriptor *vdp;
615
616 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
617 if (!(bh = sb_bread(s, block)))
618 goto out_no_read;
619
620 vdp = (struct iso_volume_descriptor *)bh->b_data;
621 hdp = (struct hs_volume_descriptor *)bh->b_data;
622
623 /*
624 * Due to the overlapping physical location of the descriptors,
625 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
626 * proper identification in this case, we first check for ISO.
627 */
628 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
629 if (isonum_711(vdp->type) == ISO_VD_END)
630 break;
631 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
632 if (pri == NULL) {
633 pri = (struct iso_primary_descriptor *)vdp;
634 /* Save the buffer in case we need it ... */
635 pri_bh = bh;
636 bh = NULL;
637 }
638 }
639 #ifdef CONFIG_JOLIET
640 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
641 sec = (struct iso_supplementary_descriptor *)vdp;
642 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
643 if (opt.joliet) {
644 if (sec->escape[2] == 0x40)
645 joliet_level = 1;
646 else if (sec->escape[2] == 0x43)
647 joliet_level = 2;
648 else if (sec->escape[2] == 0x45)
649 joliet_level = 3;
650
651 printk(KERN_DEBUG "ISO 9660 Extensions: "
652 "Microsoft Joliet Level %d\n",
653 joliet_level);
654 }
655 goto root_found;
656 } else {
657 /* Unknown supplementary volume descriptor */
658 sec = NULL;
659 }
660 }
661 #endif
662 } else {
663 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
664 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
665 goto out_freebh;
666
667 sbi->s_high_sierra = 1;
668 opt.rock = 0;
669 h_pri = (struct hs_primary_descriptor *)vdp;
670 goto root_found;
671 }
672 }
673
674 /* Just skip any volume descriptors we don't recognize */
675
676 brelse(bh);
677 bh = NULL;
678 }
679 /*
680 * If we fall through, either no volume descriptor was found,
681 * or else we passed a primary descriptor looking for others.
682 */
683 if (!pri)
684 goto out_unknown_format;
685 brelse(bh);
686 bh = pri_bh;
687 pri_bh = NULL;
688
689 root_found:
690
691 if (joliet_level && (pri == NULL || !opt.rock)) {
692 /* This is the case of Joliet with the norock mount flag.
693 * A disc with both Joliet and Rock Ridge is handled later
694 */
695 pri = (struct iso_primary_descriptor *) sec;
696 }
697
698 if(sbi->s_high_sierra){
699 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
700 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
701 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
702 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
703 } else {
704 if (!pri)
705 goto out_freebh;
706 rootp = (struct iso_directory_record *) pri->root_directory_record;
707 sbi->s_nzones = isonum_733(pri->volume_space_size);
708 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
709 sbi->s_max_size = isonum_733(pri->volume_space_size);
710 }
711
712 sbi->s_ninodes = 0; /* No way to figure this out easily */
713
714 orig_zonesize = sbi->s_log_zone_size;
715 /*
716 * If the zone size is smaller than the hardware sector size,
717 * this is a fatal error. This would occur if the disc drive
718 * had sectors that were 2048 bytes, but the filesystem had
719 * blocks that were 512 bytes (which should only very rarely
720 * happen.)
721 */
722 if (orig_zonesize < opt.blocksize)
723 goto out_bad_size;
724
725 /* RDE: convert log zone size to bit shift */
726 switch (sbi->s_log_zone_size) {
727 case 512: sbi->s_log_zone_size = 9; break;
728 case 1024: sbi->s_log_zone_size = 10; break;
729 case 2048: sbi->s_log_zone_size = 11; break;
730
731 default:
732 goto out_bad_zone_size;
733 }
734
735 s->s_magic = ISOFS_SUPER_MAGIC;
736
737 /*
738 * With multi-extent files, file size is only limited by the maximum
739 * size of a file system, which is 8 TB.
740 */
741 s->s_maxbytes = 0x80000000000LL;
742
743 /* Set this for reference. Its not currently used except on write
744 which we don't have .. */
745
746 first_data_zone = isonum_733(rootp->extent) +
747 isonum_711(rootp->ext_attr_length);
748 sbi->s_firstdatazone = first_data_zone;
749 #ifndef BEQUIET
750 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
751 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
752 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
753 if(sbi->s_high_sierra)
754 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
755 #endif
756
757 /*
758 * If the Joliet level is set, we _may_ decide to use the
759 * secondary descriptor, but can't be sure until after we
760 * read the root inode. But before reading the root inode
761 * we may need to change the device blocksize, and would
762 * rather release the old buffer first. So, we cache the
763 * first_data_zone value from the secondary descriptor.
764 */
765 if (joliet_level) {
766 pri = (struct iso_primary_descriptor *) sec;
767 rootp = (struct iso_directory_record *)
768 pri->root_directory_record;
769 first_data_zone = isonum_733(rootp->extent) +
770 isonum_711(rootp->ext_attr_length);
771 }
772
773 /*
774 * We're all done using the volume descriptor, and may need
775 * to change the device blocksize, so release the buffer now.
776 */
777 brelse(pri_bh);
778 brelse(bh);
779
780 /*
781 * Force the blocksize to 512 for 512 byte sectors. The file
782 * read primitives really get it wrong in a bad way if we don't
783 * do this.
784 *
785 * Note - we should never be setting the blocksize to something
786 * less than the hardware sector size for the device. If we
787 * do, we would end up having to read larger buffers and split
788 * out portions to satisfy requests.
789 *
790 * Note2- the idea here is that we want to deal with the optimal
791 * zonesize in the filesystem. If we have it set to something less,
792 * then we have horrible problems with trying to piece together
793 * bits of adjacent blocks in order to properly read directory
794 * entries. By forcing the blocksize in this way, we ensure
795 * that we will never be required to do this.
796 */
797 sb_set_blocksize(s, orig_zonesize);
798
799 sbi->s_nls_iocharset = NULL;
800
801 #ifdef CONFIG_JOLIET
802 if (joliet_level && opt.utf8 == 0) {
803 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
804 sbi->s_nls_iocharset = load_nls(p);
805 if (! sbi->s_nls_iocharset) {
806 /* Fail only if explicit charset specified */
807 if (opt.iocharset)
808 goto out_freesbi;
809 sbi->s_nls_iocharset = load_nls_default();
810 }
811 }
812 #endif
813 s->s_op = &isofs_sops;
814 s->s_export_op = &isofs_export_ops;
815 sbi->s_mapping = opt.map;
816 sbi->s_rock = (opt.rock ? 2 : 0);
817 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
818 sbi->s_cruft = opt.cruft;
819 sbi->s_hide = opt.hide;
820 sbi->s_showassoc = opt.showassoc;
821 sbi->s_uid = opt.uid;
822 sbi->s_gid = opt.gid;
823 sbi->s_uid_set = opt.uid_set;
824 sbi->s_gid_set = opt.gid_set;
825 sbi->s_utf8 = opt.utf8;
826 sbi->s_nocompress = opt.nocompress;
827 sbi->s_overriderockperm = opt.overriderockperm;
828 /*
829 * It would be incredibly stupid to allow people to mark every file
830 * on the disk as suid, so we merely allow them to set the default
831 * permissions.
832 */
833 if (opt.fmode != ISOFS_INVALID_MODE)
834 sbi->s_fmode = opt.fmode & 0777;
835 else
836 sbi->s_fmode = ISOFS_INVALID_MODE;
837 if (opt.dmode != ISOFS_INVALID_MODE)
838 sbi->s_dmode = opt.dmode & 0777;
839 else
840 sbi->s_dmode = ISOFS_INVALID_MODE;
841
842 /*
843 * Read the root inode, which _may_ result in changing
844 * the s_rock flag. Once we have the final s_rock value,
845 * we then decide whether to use the Joliet descriptor.
846 */
847 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
848 if (IS_ERR(inode))
849 goto out_no_root;
850
851 /*
852 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
853 * correct Joliet root directory.
854 */
855 if (sbi->s_rock == 1 && joliet_level &&
856 rootdir_empty(s, sbi->s_firstdatazone)) {
857 printk(KERN_NOTICE
858 "ISOFS: primary root directory is empty. "
859 "Disabling Rock Ridge and switching to Joliet.");
860 sbi->s_rock = 0;
861 }
862
863 /*
864 * If this disk has both Rock Ridge and Joliet on it, then we
865 * want to use Rock Ridge by default. This can be overridden
866 * by using the norock mount option. There is still one other
867 * possibility that is not taken into account: a Rock Ridge
868 * CD with Unicode names. Until someone sees such a beast, it
869 * will not be supported.
870 */
871 if (sbi->s_rock == 1) {
872 joliet_level = 0;
873 } else if (joliet_level) {
874 sbi->s_rock = 0;
875 if (sbi->s_firstdatazone != first_data_zone) {
876 sbi->s_firstdatazone = first_data_zone;
877 printk(KERN_DEBUG
878 "ISOFS: changing to secondary root\n");
879 iput(inode);
880 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
881 if (IS_ERR(inode))
882 goto out_no_root;
883 }
884 }
885
886 if (opt.check == 'u') {
887 /* Only Joliet is case insensitive by default */
888 if (joliet_level)
889 opt.check = 'r';
890 else
891 opt.check = 's';
892 }
893 sbi->s_joliet_level = joliet_level;
894
895 /* Make sure the root inode is a directory */
896 if (!S_ISDIR(inode->i_mode)) {
897 printk(KERN_WARNING
898 "isofs_fill_super: root inode is not a directory. "
899 "Corrupted media?\n");
900 goto out_iput;
901 }
902
903 table = 0;
904 if (joliet_level)
905 table += 2;
906 if (opt.check == 'r')
907 table++;
908
909 if (table)
910 s->s_d_op = &isofs_dentry_ops[table - 1];
911
912 /* get the root dentry */
913 s->s_root = d_make_root(inode);
914 if (!(s->s_root)) {
915 error = -ENOMEM;
916 goto out_no_inode;
917 }
918
919 kfree(opt.iocharset);
920
921 return 0;
922
923 /*
924 * Display error messages and free resources.
925 */
926 out_iput:
927 iput(inode);
928 goto out_no_inode;
929 out_no_root:
930 error = PTR_ERR(inode);
931 if (error != -ENOMEM)
932 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
933 out_no_inode:
934 #ifdef CONFIG_JOLIET
935 unload_nls(sbi->s_nls_iocharset);
936 #endif
937 goto out_freesbi;
938 out_no_read:
939 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
940 __func__, s->s_id, iso_blknum, block);
941 goto out_freebh;
942 out_bad_zone_size:
943 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
944 sbi->s_log_zone_size);
945 goto out_freebh;
946 out_bad_size:
947 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
948 orig_zonesize, opt.blocksize);
949 goto out_freebh;
950 out_unknown_format:
951 if (!silent)
952 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
953
954 out_freebh:
955 brelse(bh);
956 brelse(pri_bh);
957 out_freesbi:
958 kfree(opt.iocharset);
959 kfree(sbi);
960 s->s_fs_info = NULL;
961 return error;
962 }
963
964 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
965 {
966 struct super_block *sb = dentry->d_sb;
967 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
968
969 buf->f_type = ISOFS_SUPER_MAGIC;
970 buf->f_bsize = sb->s_blocksize;
971 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
972 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
973 buf->f_bfree = 0;
974 buf->f_bavail = 0;
975 buf->f_files = ISOFS_SB(sb)->s_ninodes;
976 buf->f_ffree = 0;
977 buf->f_fsid.val[0] = (u32)id;
978 buf->f_fsid.val[1] = (u32)(id >> 32);
979 buf->f_namelen = NAME_MAX;
980 return 0;
981 }
982
983 /*
984 * Get a set of blocks; filling in buffer_heads if already allocated
985 * or getblk() if they are not. Returns the number of blocks inserted
986 * (-ve == error.)
987 */
988 int isofs_get_blocks(struct inode *inode, sector_t iblock,
989 struct buffer_head **bh, unsigned long nblocks)
990 {
991 unsigned long b_off = iblock;
992 unsigned offset, sect_size;
993 unsigned int firstext;
994 unsigned long nextblk, nextoff;
995 int section, rv, error;
996 struct iso_inode_info *ei = ISOFS_I(inode);
997
998 error = -EIO;
999 rv = 0;
1000 if (iblock != b_off) {
1001 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1002 goto abort;
1003 }
1004
1005
1006 offset = 0;
1007 firstext = ei->i_first_extent;
1008 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1009 nextblk = ei->i_next_section_block;
1010 nextoff = ei->i_next_section_offset;
1011 section = 0;
1012
1013 while (nblocks) {
1014 /* If we are *way* beyond the end of the file, print a message.
1015 * Access beyond the end of the file up to the next page boundary
1016 * is normal, however because of the way the page cache works.
1017 * In this case, we just return 0 so that we can properly fill
1018 * the page with useless information without generating any
1019 * I/O errors.
1020 */
1021 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1022 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1023 __func__, b_off,
1024 (unsigned long long)inode->i_size);
1025 goto abort;
1026 }
1027
1028 /* On the last section, nextblk == 0, section size is likely to
1029 * exceed sect_size by a partial block, and access beyond the
1030 * end of the file will reach beyond the section size, too.
1031 */
1032 while (nextblk && (b_off >= (offset + sect_size))) {
1033 struct inode *ninode;
1034
1035 offset += sect_size;
1036 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1037 if (IS_ERR(ninode)) {
1038 error = PTR_ERR(ninode);
1039 goto abort;
1040 }
1041 firstext = ISOFS_I(ninode)->i_first_extent;
1042 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1043 nextblk = ISOFS_I(ninode)->i_next_section_block;
1044 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1045 iput(ninode);
1046
1047 if (++section > 100) {
1048 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1049 " aborting...\n", __func__);
1050 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1051 "nextblk=%lu nextoff=%lu\n", __func__,
1052 b_off, firstext, (unsigned) sect_size,
1053 nextblk, nextoff);
1054 goto abort;
1055 }
1056 }
1057
1058 if (*bh) {
1059 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1060 } else {
1061 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1062 if (!*bh)
1063 goto abort;
1064 }
1065 bh++; /* Next buffer head */
1066 b_off++; /* Next buffer offset */
1067 nblocks--;
1068 rv++;
1069 }
1070
1071 error = 0;
1072 abort:
1073 return rv != 0 ? rv : error;
1074 }
1075
1076 /*
1077 * Used by the standard interfaces.
1078 */
1079 static int isofs_get_block(struct inode *inode, sector_t iblock,
1080 struct buffer_head *bh_result, int create)
1081 {
1082 int ret;
1083
1084 if (create) {
1085 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1086 return -EROFS;
1087 }
1088
1089 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1090 return ret < 0 ? ret : 0;
1091 }
1092
1093 static int isofs_bmap(struct inode *inode, sector_t block)
1094 {
1095 struct buffer_head dummy;
1096 int error;
1097
1098 dummy.b_state = 0;
1099 dummy.b_blocknr = -1000;
1100 error = isofs_get_block(inode, block, &dummy, 0);
1101 if (!error)
1102 return dummy.b_blocknr;
1103 return 0;
1104 }
1105
1106 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1107 {
1108 sector_t blknr = isofs_bmap(inode, block);
1109 if (!blknr)
1110 return NULL;
1111 return sb_bread(inode->i_sb, blknr);
1112 }
1113
1114 static int isofs_readpage(struct file *file, struct page *page)
1115 {
1116 return mpage_readpage(page, isofs_get_block);
1117 }
1118
1119 static int isofs_readpages(struct file *file, struct address_space *mapping,
1120 struct list_head *pages, unsigned nr_pages)
1121 {
1122 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1123 }
1124
1125 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1126 {
1127 return generic_block_bmap(mapping,block,isofs_get_block);
1128 }
1129
1130 static const struct address_space_operations isofs_aops = {
1131 .readpage = isofs_readpage,
1132 .readpages = isofs_readpages,
1133 .bmap = _isofs_bmap
1134 };
1135
1136 static int isofs_read_level3_size(struct inode *inode)
1137 {
1138 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1139 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1140 struct buffer_head *bh = NULL;
1141 unsigned long block, offset, block_saved, offset_saved;
1142 int i = 0;
1143 int more_entries = 0;
1144 struct iso_directory_record *tmpde = NULL;
1145 struct iso_inode_info *ei = ISOFS_I(inode);
1146
1147 inode->i_size = 0;
1148
1149 /* The first 16 blocks are reserved as the System Area. Thus,
1150 * no inodes can appear in block 0. We use this to flag that
1151 * this is the last section. */
1152 ei->i_next_section_block = 0;
1153 ei->i_next_section_offset = 0;
1154
1155 block = ei->i_iget5_block;
1156 offset = ei->i_iget5_offset;
1157
1158 do {
1159 struct iso_directory_record *de;
1160 unsigned int de_len;
1161
1162 if (!bh) {
1163 bh = sb_bread(inode->i_sb, block);
1164 if (!bh)
1165 goto out_noread;
1166 }
1167 de = (struct iso_directory_record *) (bh->b_data + offset);
1168 de_len = *(unsigned char *) de;
1169
1170 if (de_len == 0) {
1171 brelse(bh);
1172 bh = NULL;
1173 ++block;
1174 offset = 0;
1175 continue;
1176 }
1177
1178 block_saved = block;
1179 offset_saved = offset;
1180 offset += de_len;
1181
1182 /* Make sure we have a full directory entry */
1183 if (offset >= bufsize) {
1184 int slop = bufsize - offset + de_len;
1185 if (!tmpde) {
1186 tmpde = kmalloc(256, GFP_KERNEL);
1187 if (!tmpde)
1188 goto out_nomem;
1189 }
1190 memcpy(tmpde, de, slop);
1191 offset &= bufsize - 1;
1192 block++;
1193 brelse(bh);
1194 bh = NULL;
1195 if (offset) {
1196 bh = sb_bread(inode->i_sb, block);
1197 if (!bh)
1198 goto out_noread;
1199 memcpy((void *)tmpde+slop, bh->b_data, offset);
1200 }
1201 de = tmpde;
1202 }
1203
1204 inode->i_size += isonum_733(de->size);
1205 if (i == 1) {
1206 ei->i_next_section_block = block_saved;
1207 ei->i_next_section_offset = offset_saved;
1208 }
1209
1210 more_entries = de->flags[-high_sierra] & 0x80;
1211
1212 i++;
1213 if (i > 100)
1214 goto out_toomany;
1215 } while (more_entries);
1216 out:
1217 kfree(tmpde);
1218 if (bh)
1219 brelse(bh);
1220 return 0;
1221
1222 out_nomem:
1223 if (bh)
1224 brelse(bh);
1225 return -ENOMEM;
1226
1227 out_noread:
1228 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1229 kfree(tmpde);
1230 return -EIO;
1231
1232 out_toomany:
1233 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1234 "isofs_read_level3_size: inode=%lu\n",
1235 __func__, inode->i_ino);
1236 goto out;
1237 }
1238
1239 static int isofs_read_inode(struct inode *inode, int relocated)
1240 {
1241 struct super_block *sb = inode->i_sb;
1242 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1243 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1244 unsigned long block;
1245 int high_sierra = sbi->s_high_sierra;
1246 struct buffer_head *bh = NULL;
1247 struct iso_directory_record *de;
1248 struct iso_directory_record *tmpde = NULL;
1249 unsigned int de_len;
1250 unsigned long offset;
1251 struct iso_inode_info *ei = ISOFS_I(inode);
1252 int ret = -EIO;
1253
1254 block = ei->i_iget5_block;
1255 bh = sb_bread(inode->i_sb, block);
1256 if (!bh)
1257 goto out_badread;
1258
1259 offset = ei->i_iget5_offset;
1260
1261 de = (struct iso_directory_record *) (bh->b_data + offset);
1262 de_len = *(unsigned char *) de;
1263
1264 if (offset + de_len > bufsize) {
1265 int frag1 = bufsize - offset;
1266
1267 tmpde = kmalloc(de_len, GFP_KERNEL);
1268 if (tmpde == NULL) {
1269 printk(KERN_INFO "%s: out of memory\n", __func__);
1270 ret = -ENOMEM;
1271 goto fail;
1272 }
1273 memcpy(tmpde, bh->b_data + offset, frag1);
1274 brelse(bh);
1275 bh = sb_bread(inode->i_sb, ++block);
1276 if (!bh)
1277 goto out_badread;
1278 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1279 de = tmpde;
1280 }
1281
1282 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1283 ei->i_iget5_offset,
1284 ISOFS_BUFFER_BITS(inode));
1285
1286 /* Assume it is a normal-format file unless told otherwise */
1287 ei->i_file_format = isofs_file_normal;
1288
1289 if (de->flags[-high_sierra] & 2) {
1290 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1291 inode->i_mode = S_IFDIR | sbi->s_dmode;
1292 else
1293 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1294 set_nlink(inode, 1); /*
1295 * Set to 1. We know there are 2, but
1296 * the find utility tries to optimize
1297 * if it is 2, and it screws up. It is
1298 * easier to give 1 which tells find to
1299 * do it the hard way.
1300 */
1301 } else {
1302 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1303 inode->i_mode = S_IFREG | sbi->s_fmode;
1304 } else {
1305 /*
1306 * Set default permissions: r-x for all. The disc
1307 * could be shared with DOS machines so virtually
1308 * anything could be a valid executable.
1309 */
1310 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1311 }
1312 set_nlink(inode, 1);
1313 }
1314 inode->i_uid = sbi->s_uid;
1315 inode->i_gid = sbi->s_gid;
1316 inode->i_blocks = 0;
1317
1318 ei->i_format_parm[0] = 0;
1319 ei->i_format_parm[1] = 0;
1320 ei->i_format_parm[2] = 0;
1321
1322 ei->i_section_size = isonum_733(de->size);
1323 if (de->flags[-high_sierra] & 0x80) {
1324 ret = isofs_read_level3_size(inode);
1325 if (ret < 0)
1326 goto fail;
1327 ret = -EIO;
1328 } else {
1329 ei->i_next_section_block = 0;
1330 ei->i_next_section_offset = 0;
1331 inode->i_size = isonum_733(de->size);
1332 }
1333
1334 /*
1335 * Some dipshit decided to store some other bit of information
1336 * in the high byte of the file length. Truncate size in case
1337 * this CDROM was mounted with the cruft option.
1338 */
1339
1340 if (sbi->s_cruft)
1341 inode->i_size &= 0x00ffffff;
1342
1343 if (de->interleave[0]) {
1344 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1345 inode->i_size = 0;
1346 }
1347
1348 /* I have no idea what file_unit_size is used for, so
1349 we will flag it for now */
1350 if (de->file_unit_size[0] != 0) {
1351 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1352 inode->i_ino);
1353 }
1354
1355 /* I have no idea what other flag bits are used for, so
1356 we will flag it for now */
1357 #ifdef DEBUG
1358 if((de->flags[-high_sierra] & ~2)!= 0){
1359 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1360 "(%ld %x).\n",
1361 inode->i_ino, de->flags[-high_sierra]);
1362 }
1363 #endif
1364
1365 inode->i_mtime.tv_sec =
1366 inode->i_atime.tv_sec =
1367 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1368 inode->i_mtime.tv_nsec =
1369 inode->i_atime.tv_nsec =
1370 inode->i_ctime.tv_nsec = 0;
1371
1372 ei->i_first_extent = (isonum_733(de->extent) +
1373 isonum_711(de->ext_attr_length));
1374
1375 /* Set the number of blocks for stat() - should be done before RR */
1376 inode->i_blocks = (inode->i_size + 511) >> 9;
1377
1378 /*
1379 * Now test for possible Rock Ridge extensions which will override
1380 * some of these numbers in the inode structure.
1381 */
1382
1383 if (!high_sierra) {
1384 parse_rock_ridge_inode(de, inode, relocated);
1385 /* if we want uid/gid set, override the rock ridge setting */
1386 if (sbi->s_uid_set)
1387 inode->i_uid = sbi->s_uid;
1388 if (sbi->s_gid_set)
1389 inode->i_gid = sbi->s_gid;
1390 }
1391 /* Now set final access rights if overriding rock ridge setting */
1392 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1393 sbi->s_dmode != ISOFS_INVALID_MODE)
1394 inode->i_mode = S_IFDIR | sbi->s_dmode;
1395 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1396 sbi->s_fmode != ISOFS_INVALID_MODE)
1397 inode->i_mode = S_IFREG | sbi->s_fmode;
1398
1399 /* Install the inode operations vector */
1400 if (S_ISREG(inode->i_mode)) {
1401 inode->i_fop = &generic_ro_fops;
1402 switch (ei->i_file_format) {
1403 #ifdef CONFIG_ZISOFS
1404 case isofs_file_compressed:
1405 inode->i_data.a_ops = &zisofs_aops;
1406 break;
1407 #endif
1408 default:
1409 inode->i_data.a_ops = &isofs_aops;
1410 break;
1411 }
1412 } else if (S_ISDIR(inode->i_mode)) {
1413 inode->i_op = &isofs_dir_inode_operations;
1414 inode->i_fop = &isofs_dir_operations;
1415 } else if (S_ISLNK(inode->i_mode)) {
1416 inode->i_op = &page_symlink_inode_operations;
1417 inode_nohighmem(inode);
1418 inode->i_data.a_ops = &isofs_symlink_aops;
1419 } else
1420 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1421 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1422
1423 ret = 0;
1424 out:
1425 kfree(tmpde);
1426 if (bh)
1427 brelse(bh);
1428 return ret;
1429
1430 out_badread:
1431 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1432 fail:
1433 goto out;
1434 }
1435
1436 struct isofs_iget5_callback_data {
1437 unsigned long block;
1438 unsigned long offset;
1439 };
1440
1441 static int isofs_iget5_test(struct inode *ino, void *data)
1442 {
1443 struct iso_inode_info *i = ISOFS_I(ino);
1444 struct isofs_iget5_callback_data *d =
1445 (struct isofs_iget5_callback_data*)data;
1446 return (i->i_iget5_block == d->block)
1447 && (i->i_iget5_offset == d->offset);
1448 }
1449
1450 static int isofs_iget5_set(struct inode *ino, void *data)
1451 {
1452 struct iso_inode_info *i = ISOFS_I(ino);
1453 struct isofs_iget5_callback_data *d =
1454 (struct isofs_iget5_callback_data*)data;
1455 i->i_iget5_block = d->block;
1456 i->i_iget5_offset = d->offset;
1457 return 0;
1458 }
1459
1460 /* Store, in the inode's containing structure, the block and block
1461 * offset that point to the underlying meta-data for the inode. The
1462 * code below is otherwise similar to the iget() code in
1463 * include/linux/fs.h */
1464 struct inode *__isofs_iget(struct super_block *sb,
1465 unsigned long block,
1466 unsigned long offset,
1467 int relocated)
1468 {
1469 unsigned long hashval;
1470 struct inode *inode;
1471 struct isofs_iget5_callback_data data;
1472 long ret;
1473
1474 if (offset >= 1ul << sb->s_blocksize_bits)
1475 return ERR_PTR(-EINVAL);
1476
1477 data.block = block;
1478 data.offset = offset;
1479
1480 hashval = (block << sb->s_blocksize_bits) | offset;
1481
1482 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1483 &isofs_iget5_set, &data);
1484
1485 if (!inode)
1486 return ERR_PTR(-ENOMEM);
1487
1488 if (inode->i_state & I_NEW) {
1489 ret = isofs_read_inode(inode, relocated);
1490 if (ret < 0) {
1491 iget_failed(inode);
1492 inode = ERR_PTR(ret);
1493 } else {
1494 unlock_new_inode(inode);
1495 }
1496 }
1497
1498 return inode;
1499 }
1500
1501 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1502 int flags, const char *dev_name, void *data)
1503 {
1504 /* We don't support read-write mounts */
1505 if (!(flags & MS_RDONLY))
1506 return ERR_PTR(-EACCES);
1507 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1508 }
1509
1510 static struct file_system_type iso9660_fs_type = {
1511 .owner = THIS_MODULE,
1512 .name = "iso9660",
1513 .mount = isofs_mount,
1514 .kill_sb = kill_block_super,
1515 .fs_flags = FS_REQUIRES_DEV,
1516 };
1517 MODULE_ALIAS_FS("iso9660");
1518 MODULE_ALIAS("iso9660");
1519
1520 static int __init init_iso9660_fs(void)
1521 {
1522 int err = init_inodecache();
1523 if (err)
1524 goto out;
1525 #ifdef CONFIG_ZISOFS
1526 err = zisofs_init();
1527 if (err)
1528 goto out1;
1529 #endif
1530 err = register_filesystem(&iso9660_fs_type);
1531 if (err)
1532 goto out2;
1533 return 0;
1534 out2:
1535 #ifdef CONFIG_ZISOFS
1536 zisofs_cleanup();
1537 out1:
1538 #endif
1539 destroy_inodecache();
1540 out:
1541 return err;
1542 }
1543
1544 static void __exit exit_iso9660_fs(void)
1545 {
1546 unregister_filesystem(&iso9660_fs_type);
1547 #ifdef CONFIG_ZISOFS
1548 zisofs_cleanup();
1549 #endif
1550 destroy_inodecache();
1551 }
1552
1553 module_init(init_iso9660_fs)
1554 module_exit(exit_iso9660_fs)
1555 MODULE_LICENSE("GPL");
Linux with added FPC-III support