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Merge branch 'samsung-fixes-4' of git://github.com/kgene/linux-samsung
[linux-btrfs-devel.git] / fs / isofs / inode.c
bloba5d03672d04edbd76f6014124922aea631ba9ed7
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
24 #include "isofs.h"
25 #include "zisofs.h"
26
27 #define BEQUIET
28
29 static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
30 struct qstr *qstr);
31 static int isofs_hash(const struct dentry *parent, const struct inode *inode,
32 struct qstr *qstr);
33 static int isofs_dentry_cmpi(const struct dentry *parent,
34 const struct inode *pinode,
35 const struct dentry *dentry, const struct inode *inode,
36 unsigned int len, const char *str, const struct qstr *name);
37 static int isofs_dentry_cmp(const struct dentry *parent,
38 const struct inode *pinode,
39 const struct dentry *dentry, const struct inode *inode,
40 unsigned int len, const char *str, const struct qstr *name);
41
42 #ifdef CONFIG_JOLIET
43 static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
44 struct qstr *qstr);
45 static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
46 struct qstr *qstr);
47 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
48 const struct inode *pinode,
49 const struct dentry *dentry, const struct inode *inode,
50 unsigned int len, const char *str, const struct qstr *name);
51 static int isofs_dentry_cmp_ms(const struct dentry *parent,
52 const struct inode *pinode,
53 const struct dentry *dentry, const struct inode *inode,
54 unsigned int len, const char *str, const struct qstr *name);
55 #endif
56
57 static void isofs_put_super(struct super_block *sb)
58 {
59 struct isofs_sb_info *sbi = ISOFS_SB(sb);
60
61 #ifdef CONFIG_JOLIET
62 unload_nls(sbi->s_nls_iocharset);
63 #endif
64
65 kfree(sbi);
66 sb->s_fs_info = NULL;
67 return;
68 }
69
70 static int isofs_read_inode(struct inode *);
71 static int isofs_statfs (struct dentry *, struct kstatfs *);
72
73 static struct kmem_cache *isofs_inode_cachep;
74
75 static struct inode *isofs_alloc_inode(struct super_block *sb)
76 {
77 struct iso_inode_info *ei;
78 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
79 if (!ei)
80 return NULL;
81 return &ei->vfs_inode;
82 }
83
84 static void isofs_i_callback(struct rcu_head *head)
85 {
86 struct inode *inode = container_of(head, struct inode, i_rcu);
87 INIT_LIST_HEAD(&inode->i_dentry);
88 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
89 }
90
91 static void isofs_destroy_inode(struct inode *inode)
92 {
93 call_rcu(&inode->i_rcu, isofs_i_callback);
94 }
95
96 static void init_once(void *foo)
97 {
98 struct iso_inode_info *ei = foo;
99
100 inode_init_once(&ei->vfs_inode);
101 }
102
103 static int init_inodecache(void)
104 {
105 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
106 sizeof(struct iso_inode_info),
107 0, (SLAB_RECLAIM_ACCOUNT|
108 SLAB_MEM_SPREAD),
109 init_once);
110 if (isofs_inode_cachep == NULL)
111 return -ENOMEM;
112 return 0;
113 }
114
115 static void destroy_inodecache(void)
116 {
117 kmem_cache_destroy(isofs_inode_cachep);
118 }
119
120 static int isofs_remount(struct super_block *sb, int *flags, char *data)
121 {
122 /* we probably want a lot more here */
123 *flags |= MS_RDONLY;
124 return 0;
125 }
126
127 static const struct super_operations isofs_sops = {
128 .alloc_inode = isofs_alloc_inode,
129 .destroy_inode = isofs_destroy_inode,
130 .put_super = isofs_put_super,
131 .statfs = isofs_statfs,
132 .remount_fs = isofs_remount,
133 .show_options = generic_show_options,
134 };
135
136
137 static const struct dentry_operations isofs_dentry_ops[] = {
138 {
139 .d_hash = isofs_hash,
140 .d_compare = isofs_dentry_cmp,
141 },
142 {
143 .d_hash = isofs_hashi,
144 .d_compare = isofs_dentry_cmpi,
145 },
146 #ifdef CONFIG_JOLIET
147 {
148 .d_hash = isofs_hash_ms,
149 .d_compare = isofs_dentry_cmp_ms,
150 },
151 {
152 .d_hash = isofs_hashi_ms,
153 .d_compare = isofs_dentry_cmpi_ms,
154 },
155 #endif
156 };
157
158 struct iso9660_options{
159 unsigned int rock:1;
160 unsigned int joliet:1;
161 unsigned int cruft:1;
162 unsigned int hide:1;
163 unsigned int showassoc:1;
164 unsigned int nocompress:1;
165 unsigned int overriderockperm:1;
166 unsigned int uid_set:1;
167 unsigned int gid_set:1;
168 unsigned int utf8:1;
169 unsigned char map;
170 unsigned char check;
171 unsigned int blocksize;
172 mode_t fmode;
173 mode_t dmode;
174 gid_t gid;
175 uid_t uid;
176 char *iocharset;
177 /* LVE */
178 s32 session;
179 s32 sbsector;
180 };
181
182 /*
183 * Compute the hash for the isofs name corresponding to the dentry.
184 */
185 static int
186 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
187 {
188 const char *name;
189 int len;
190
191 len = qstr->len;
192 name = qstr->name;
193 if (ms) {
194 while (len && name[len-1] == '.')
195 len--;
196 }
197
198 qstr->hash = full_name_hash(name, len);
199
200 return 0;
201 }
202
203 /*
204 * Compute the hash for the isofs name corresponding to the dentry.
205 */
206 static int
207 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
208 {
209 const char *name;
210 int len;
211 char c;
212 unsigned long hash;
213
214 len = qstr->len;
215 name = qstr->name;
216 if (ms) {
217 while (len && name[len-1] == '.')
218 len--;
219 }
220
221 hash = init_name_hash();
222 while (len--) {
223 c = tolower(*name++);
224 hash = partial_name_hash(c, hash);
225 }
226 qstr->hash = end_name_hash(hash);
227
228 return 0;
229 }
230
231 /*
232 * Compare of two isofs names.
233 */
234 static int isofs_dentry_cmp_common(
235 unsigned int len, const char *str,
236 const struct qstr *name, int ms, int ci)
237 {
238 int alen, blen;
239
240 /* A filename cannot end in '.' or we treat it like it has none */
241 alen = name->len;
242 blen = len;
243 if (ms) {
244 while (alen && name->name[alen-1] == '.')
245 alen--;
246 while (blen && str[blen-1] == '.')
247 blen--;
248 }
249 if (alen == blen) {
250 if (ci) {
251 if (strnicmp(name->name, str, alen) == 0)
252 return 0;
253 } else {
254 if (strncmp(name->name, str, alen) == 0)
255 return 0;
256 }
257 }
258 return 1;
259 }
260
261 static int
262 isofs_hash(const struct dentry *dentry, const struct inode *inode,
263 struct qstr *qstr)
264 {
265 return isofs_hash_common(dentry, qstr, 0);
266 }
267
268 static int
269 isofs_hashi(const struct dentry *dentry, const struct inode *inode,
270 struct qstr *qstr)
271 {
272 return isofs_hashi_common(dentry, qstr, 0);
273 }
274
275 static int
276 isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
277 const struct dentry *dentry, const struct inode *inode,
278 unsigned int len, const char *str, const struct qstr *name)
279 {
280 return isofs_dentry_cmp_common(len, str, name, 0, 0);
281 }
282
283 static int
284 isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
285 const struct dentry *dentry, const struct inode *inode,
286 unsigned int len, const char *str, const struct qstr *name)
287 {
288 return isofs_dentry_cmp_common(len, str, name, 0, 1);
289 }
290
291 #ifdef CONFIG_JOLIET
292 static int
293 isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
294 struct qstr *qstr)
295 {
296 return isofs_hash_common(dentry, qstr, 1);
297 }
298
299 static int
300 isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
301 struct qstr *qstr)
302 {
303 return isofs_hashi_common(dentry, qstr, 1);
304 }
305
306 static int
307 isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
308 const struct dentry *dentry, const struct inode *inode,
309 unsigned int len, const char *str, const struct qstr *name)
310 {
311 return isofs_dentry_cmp_common(len, str, name, 1, 0);
312 }
313
314 static int
315 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
316 const struct dentry *dentry, const struct inode *inode,
317 unsigned int len, const char *str, const struct qstr *name)
318 {
319 return isofs_dentry_cmp_common(len, str, name, 1, 1);
320 }
321 #endif
322
323 enum {
324 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
325 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
326 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
327 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
328 };
329
330 static const match_table_t tokens = {
331 {Opt_norock, "norock"},
332 {Opt_nojoliet, "nojoliet"},
333 {Opt_unhide, "unhide"},
334 {Opt_hide, "hide"},
335 {Opt_showassoc, "showassoc"},
336 {Opt_cruft, "cruft"},
337 {Opt_utf8, "utf8"},
338 {Opt_iocharset, "iocharset=%s"},
339 {Opt_map_a, "map=acorn"},
340 {Opt_map_a, "map=a"},
341 {Opt_map_n, "map=normal"},
342 {Opt_map_n, "map=n"},
343 {Opt_map_o, "map=off"},
344 {Opt_map_o, "map=o"},
345 {Opt_session, "session=%u"},
346 {Opt_sb, "sbsector=%u"},
347 {Opt_check_r, "check=relaxed"},
348 {Opt_check_r, "check=r"},
349 {Opt_check_s, "check=strict"},
350 {Opt_check_s, "check=s"},
351 {Opt_uid, "uid=%u"},
352 {Opt_gid, "gid=%u"},
353 {Opt_mode, "mode=%u"},
354 {Opt_dmode, "dmode=%u"},
355 {Opt_overriderockperm, "overriderockperm"},
356 {Opt_block, "block=%u"},
357 {Opt_ignore, "conv=binary"},
358 {Opt_ignore, "conv=b"},
359 {Opt_ignore, "conv=text"},
360 {Opt_ignore, "conv=t"},
361 {Opt_ignore, "conv=mtext"},
362 {Opt_ignore, "conv=m"},
363 {Opt_ignore, "conv=auto"},
364 {Opt_ignore, "conv=a"},
365 {Opt_nocompress, "nocompress"},
366 {Opt_err, NULL}
367 };
368
369 static int parse_options(char *options, struct iso9660_options *popt)
370 {
371 char *p;
372 int option;
373
374 popt->map = 'n';
375 popt->rock = 1;
376 popt->joliet = 1;
377 popt->cruft = 0;
378 popt->hide = 0;
379 popt->showassoc = 0;
380 popt->check = 'u'; /* unset */
381 popt->nocompress = 0;
382 popt->blocksize = 1024;
383 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
384 popt->uid_set = 0;
385 popt->gid_set = 0;
386 popt->gid = 0;
387 popt->uid = 0;
388 popt->iocharset = NULL;
389 popt->utf8 = 0;
390 popt->overriderockperm = 0;
391 popt->session=-1;
392 popt->sbsector=-1;
393 if (!options)
394 return 1;
395
396 while ((p = strsep(&options, ",")) != NULL) {
397 int token;
398 substring_t args[MAX_OPT_ARGS];
399 unsigned n;
400
401 if (!*p)
402 continue;
403
404 token = match_token(p, tokens, args);
405 switch (token) {
406 case Opt_norock:
407 popt->rock = 0;
408 break;
409 case Opt_nojoliet:
410 popt->joliet = 0;
411 break;
412 case Opt_hide:
413 popt->hide = 1;
414 break;
415 case Opt_unhide:
416 case Opt_showassoc:
417 popt->showassoc = 1;
418 break;
419 case Opt_cruft:
420 popt->cruft = 1;
421 break;
422 case Opt_utf8:
423 popt->utf8 = 1;
424 break;
425 #ifdef CONFIG_JOLIET
426 case Opt_iocharset:
427 popt->iocharset = match_strdup(&args[0]);
428 break;
429 #endif
430 case Opt_map_a:
431 popt->map = 'a';
432 break;
433 case Opt_map_o:
434 popt->map = 'o';
435 break;
436 case Opt_map_n:
437 popt->map = 'n';
438 break;
439 case Opt_session:
440 if (match_int(&args[0], &option))
441 return 0;
442 n = option;
443 if (n > 99)
444 return 0;
445 popt->session = n + 1;
446 break;
447 case Opt_sb:
448 if (match_int(&args[0], &option))
449 return 0;
450 popt->sbsector = option;
451 break;
452 case Opt_check_r:
453 popt->check = 'r';
454 break;
455 case Opt_check_s:
456 popt->check = 's';
457 break;
458 case Opt_ignore:
459 break;
460 case Opt_uid:
461 if (match_int(&args[0], &option))
462 return 0;
463 popt->uid = option;
464 popt->uid_set = 1;
465 break;
466 case Opt_gid:
467 if (match_int(&args[0], &option))
468 return 0;
469 popt->gid = option;
470 popt->gid_set = 1;
471 break;
472 case Opt_mode:
473 if (match_int(&args[0], &option))
474 return 0;
475 popt->fmode = option;
476 break;
477 case Opt_dmode:
478 if (match_int(&args[0], &option))
479 return 0;
480 popt->dmode = option;
481 break;
482 case Opt_overriderockperm:
483 popt->overriderockperm = 1;
484 break;
485 case Opt_block:
486 if (match_int(&args[0], &option))
487 return 0;
488 n = option;
489 if (n != 512 && n != 1024 && n != 2048)
490 return 0;
491 popt->blocksize = n;
492 break;
493 case Opt_nocompress:
494 popt->nocompress = 1;
495 break;
496 default:
497 return 0;
498 }
499 }
500 return 1;
501 }
502
503 /*
504 * look if the driver can tell the multi session redirection value
505 *
506 * don't change this if you don't know what you do, please!
507 * Multisession is legal only with XA disks.
508 * A non-XA disk with more than one volume descriptor may do it right, but
509 * usually is written in a nowhere standardized "multi-partition" manner.
510 * Multisession uses absolute addressing (solely the first frame of the whole
511 * track is #0), multi-partition uses relative addressing (each first frame of
512 * each track is #0), and a track is not a session.
513 *
514 * A broken CDwriter software or drive firmware does not set new standards,
515 * at least not if conflicting with the existing ones.
516 *
517 * emoenke@gwdg.de
518 */
519 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
520
521 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
522 {
523 struct cdrom_multisession ms_info;
524 unsigned int vol_desc_start;
525 struct block_device *bdev = sb->s_bdev;
526 int i;
527
528 vol_desc_start=0;
529 ms_info.addr_format=CDROM_LBA;
530 if(session >= 0 && session <= 99) {
531 struct cdrom_tocentry Te;
532 Te.cdte_track=session;
533 Te.cdte_format=CDROM_LBA;
534 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
535 if (!i) {
536 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
537 session, Te.cdte_addr.lba,
538 Te.cdte_ctrl&CDROM_DATA_TRACK);
539 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
540 return Te.cdte_addr.lba;
541 }
542
543 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
544 }
545 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
546 if (session > 0)
547 printk(KERN_ERR "ISOFS: Invalid session number\n");
548 #if 0
549 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
550 if (i==0) {
551 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
552 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
553 }
554 #endif
555 if (i==0)
556 #if WE_OBEY_THE_WRITTEN_STANDARDS
557 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
558 #endif
559 vol_desc_start=ms_info.addr.lba;
560 return vol_desc_start;
561 }
562
563 /*
564 * Check if root directory is empty (has less than 3 files).
565 *
566 * Used to detect broken CDs where ISO root directory is empty but Joliet root
567 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
568 * (and Joliet used instead) or else no files would be visible.
569 */
570 static bool rootdir_empty(struct super_block *sb, unsigned long block)
571 {
572 int offset = 0, files = 0, de_len;
573 struct iso_directory_record *de;
574 struct buffer_head *bh;
575
576 bh = sb_bread(sb, block);
577 if (!bh)
578 return true;
579 while (files < 3) {
580 de = (struct iso_directory_record *) (bh->b_data + offset);
581 de_len = *(unsigned char *) de;
582 if (de_len == 0)
583 break;
584 files++;
585 offset += de_len;
586 }
587 brelse(bh);
588 return files < 3;
589 }
590
591 /*
592 * Initialize the superblock and read the root inode.
593 *
594 * Note: a check_disk_change() has been done immediately prior
595 * to this call, so we don't need to check again.
596 */
597 static int isofs_fill_super(struct super_block *s, void *data, int silent)
598 {
599 struct buffer_head *bh = NULL, *pri_bh = NULL;
600 struct hs_primary_descriptor *h_pri = NULL;
601 struct iso_primary_descriptor *pri = NULL;
602 struct iso_supplementary_descriptor *sec = NULL;
603 struct iso_directory_record *rootp;
604 struct inode *inode;
605 struct iso9660_options opt;
606 struct isofs_sb_info *sbi;
607 unsigned long first_data_zone;
608 int joliet_level = 0;
609 int iso_blknum, block;
610 int orig_zonesize;
611 int table, error = -EINVAL;
612 unsigned int vol_desc_start;
613
614 save_mount_options(s, data);
615
616 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617 if (!sbi)
618 return -ENOMEM;
619 s->s_fs_info = sbi;
620
621 if (!parse_options((char *)data, &opt))
622 goto out_freesbi;
623
624 /*
625 * First of all, get the hardware blocksize for this device.
626 * If we don't know what it is, or the hardware blocksize is
627 * larger than the blocksize the user specified, then use
628 * that value.
629 */
630 /*
631 * What if bugger tells us to go beyond page size?
632 */
633 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
634
635 sbi->s_high_sierra = 0; /* default is iso9660 */
636
637 vol_desc_start = (opt.sbsector != -1) ?
638 opt.sbsector : isofs_get_last_session(s,opt.session);
639
640 for (iso_blknum = vol_desc_start+16;
641 iso_blknum < vol_desc_start+100; iso_blknum++) {
642 struct hs_volume_descriptor *hdp;
643 struct iso_volume_descriptor *vdp;
644
645 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
646 if (!(bh = sb_bread(s, block)))
647 goto out_no_read;
648
649 vdp = (struct iso_volume_descriptor *)bh->b_data;
650 hdp = (struct hs_volume_descriptor *)bh->b_data;
651
652 /*
653 * Due to the overlapping physical location of the descriptors,
654 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
655 * proper identification in this case, we first check for ISO.
656 */
657 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
658 if (isonum_711(vdp->type) == ISO_VD_END)
659 break;
660 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
661 if (pri == NULL) {
662 pri = (struct iso_primary_descriptor *)vdp;
663 /* Save the buffer in case we need it ... */
664 pri_bh = bh;
665 bh = NULL;
666 }
667 }
668 #ifdef CONFIG_JOLIET
669 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
670 sec = (struct iso_supplementary_descriptor *)vdp;
671 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
672 if (opt.joliet) {
673 if (sec->escape[2] == 0x40)
674 joliet_level = 1;
675 else if (sec->escape[2] == 0x43)
676 joliet_level = 2;
677 else if (sec->escape[2] == 0x45)
678 joliet_level = 3;
679
680 printk(KERN_DEBUG "ISO 9660 Extensions: "
681 "Microsoft Joliet Level %d\n",
682 joliet_level);
683 }
684 goto root_found;
685 } else {
686 /* Unknown supplementary volume descriptor */
687 sec = NULL;
688 }
689 }
690 #endif
691 } else {
692 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
693 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
694 goto out_freebh;
695
696 sbi->s_high_sierra = 1;
697 opt.rock = 0;
698 h_pri = (struct hs_primary_descriptor *)vdp;
699 goto root_found;
700 }
701 }
702
703 /* Just skip any volume descriptors we don't recognize */
704
705 brelse(bh);
706 bh = NULL;
707 }
708 /*
709 * If we fall through, either no volume descriptor was found,
710 * or else we passed a primary descriptor looking for others.
711 */
712 if (!pri)
713 goto out_unknown_format;
714 brelse(bh);
715 bh = pri_bh;
716 pri_bh = NULL;
717
718 root_found:
719
720 if (joliet_level && (pri == NULL || !opt.rock)) {
721 /* This is the case of Joliet with the norock mount flag.
722 * A disc with both Joliet and Rock Ridge is handled later
723 */
724 pri = (struct iso_primary_descriptor *) sec;
725 }
726
727 if(sbi->s_high_sierra){
728 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
729 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
730 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
731 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
732 } else {
733 if (!pri)
734 goto out_freebh;
735 rootp = (struct iso_directory_record *) pri->root_directory_record;
736 sbi->s_nzones = isonum_733(pri->volume_space_size);
737 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
738 sbi->s_max_size = isonum_733(pri->volume_space_size);
739 }
740
741 sbi->s_ninodes = 0; /* No way to figure this out easily */
742
743 orig_zonesize = sbi->s_log_zone_size;
744 /*
745 * If the zone size is smaller than the hardware sector size,
746 * this is a fatal error. This would occur if the disc drive
747 * had sectors that were 2048 bytes, but the filesystem had
748 * blocks that were 512 bytes (which should only very rarely
749 * happen.)
750 */
751 if (orig_zonesize < opt.blocksize)
752 goto out_bad_size;
753
754 /* RDE: convert log zone size to bit shift */
755 switch (sbi->s_log_zone_size) {
756 case 512: sbi->s_log_zone_size = 9; break;
757 case 1024: sbi->s_log_zone_size = 10; break;
758 case 2048: sbi->s_log_zone_size = 11; break;
759
760 default:
761 goto out_bad_zone_size;
762 }
763
764 s->s_magic = ISOFS_SUPER_MAGIC;
765
766 /*
767 * With multi-extent files, file size is only limited by the maximum
768 * size of a file system, which is 8 TB.
769 */
770 s->s_maxbytes = 0x80000000000LL;
771
772 /*
773 * The CDROM is read-only, has no nodes (devices) on it, and since
774 * all of the files appear to be owned by root, we really do not want
775 * to allow suid. (suid or devices will not show up unless we have
776 * Rock Ridge extensions)
777 */
778
779 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
780
781 /* Set this for reference. Its not currently used except on write
782 which we don't have .. */
783
784 first_data_zone = isonum_733(rootp->extent) +
785 isonum_711(rootp->ext_attr_length);
786 sbi->s_firstdatazone = first_data_zone;
787 #ifndef BEQUIET
788 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
789 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
790 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
791 if(sbi->s_high_sierra)
792 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
793 #endif
794
795 /*
796 * If the Joliet level is set, we _may_ decide to use the
797 * secondary descriptor, but can't be sure until after we
798 * read the root inode. But before reading the root inode
799 * we may need to change the device blocksize, and would
800 * rather release the old buffer first. So, we cache the
801 * first_data_zone value from the secondary descriptor.
802 */
803 if (joliet_level) {
804 pri = (struct iso_primary_descriptor *) sec;
805 rootp = (struct iso_directory_record *)
806 pri->root_directory_record;
807 first_data_zone = isonum_733(rootp->extent) +
808 isonum_711(rootp->ext_attr_length);
809 }
810
811 /*
812 * We're all done using the volume descriptor, and may need
813 * to change the device blocksize, so release the buffer now.
814 */
815 brelse(pri_bh);
816 brelse(bh);
817
818 /*
819 * Force the blocksize to 512 for 512 byte sectors. The file
820 * read primitives really get it wrong in a bad way if we don't
821 * do this.
822 *
823 * Note - we should never be setting the blocksize to something
824 * less than the hardware sector size for the device. If we
825 * do, we would end up having to read larger buffers and split
826 * out portions to satisfy requests.
827 *
828 * Note2- the idea here is that we want to deal with the optimal
829 * zonesize in the filesystem. If we have it set to something less,
830 * then we have horrible problems with trying to piece together
831 * bits of adjacent blocks in order to properly read directory
832 * entries. By forcing the blocksize in this way, we ensure
833 * that we will never be required to do this.
834 */
835 sb_set_blocksize(s, orig_zonesize);
836
837 sbi->s_nls_iocharset = NULL;
838
839 #ifdef CONFIG_JOLIET
840 if (joliet_level && opt.utf8 == 0) {
841 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
842 sbi->s_nls_iocharset = load_nls(p);
843 if (! sbi->s_nls_iocharset) {
844 /* Fail only if explicit charset specified */
845 if (opt.iocharset)
846 goto out_freesbi;
847 sbi->s_nls_iocharset = load_nls_default();
848 }
849 }
850 #endif
851 s->s_op = &isofs_sops;
852 s->s_export_op = &isofs_export_ops;
853 sbi->s_mapping = opt.map;
854 sbi->s_rock = (opt.rock ? 2 : 0);
855 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
856 sbi->s_cruft = opt.cruft;
857 sbi->s_hide = opt.hide;
858 sbi->s_showassoc = opt.showassoc;
859 sbi->s_uid = opt.uid;
860 sbi->s_gid = opt.gid;
861 sbi->s_uid_set = opt.uid_set;
862 sbi->s_gid_set = opt.gid_set;
863 sbi->s_utf8 = opt.utf8;
864 sbi->s_nocompress = opt.nocompress;
865 sbi->s_overriderockperm = opt.overriderockperm;
866 /*
867 * It would be incredibly stupid to allow people to mark every file
868 * on the disk as suid, so we merely allow them to set the default
869 * permissions.
870 */
871 if (opt.fmode != ISOFS_INVALID_MODE)
872 sbi->s_fmode = opt.fmode & 0777;
873 else
874 sbi->s_fmode = ISOFS_INVALID_MODE;
875 if (opt.dmode != ISOFS_INVALID_MODE)
876 sbi->s_dmode = opt.dmode & 0777;
877 else
878 sbi->s_dmode = ISOFS_INVALID_MODE;
879
880 /*
881 * Read the root inode, which _may_ result in changing
882 * the s_rock flag. Once we have the final s_rock value,
883 * we then decide whether to use the Joliet descriptor.
884 */
885 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
886 if (IS_ERR(inode))
887 goto out_no_root;
888
889 /*
890 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
891 * correct Joliet root directory.
892 */
893 if (sbi->s_rock == 1 && joliet_level &&
894 rootdir_empty(s, sbi->s_firstdatazone)) {
895 printk(KERN_NOTICE
896 "ISOFS: primary root directory is empty. "
897 "Disabling Rock Ridge and switching to Joliet.");
898 sbi->s_rock = 0;
899 }
900
901 /*
902 * If this disk has both Rock Ridge and Joliet on it, then we
903 * want to use Rock Ridge by default. This can be overridden
904 * by using the norock mount option. There is still one other
905 * possibility that is not taken into account: a Rock Ridge
906 * CD with Unicode names. Until someone sees such a beast, it
907 * will not be supported.
908 */
909 if (sbi->s_rock == 1) {
910 joliet_level = 0;
911 } else if (joliet_level) {
912 sbi->s_rock = 0;
913 if (sbi->s_firstdatazone != first_data_zone) {
914 sbi->s_firstdatazone = first_data_zone;
915 printk(KERN_DEBUG
916 "ISOFS: changing to secondary root\n");
917 iput(inode);
918 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
919 if (IS_ERR(inode))
920 goto out_no_root;
921 }
922 }
923
924 if (opt.check == 'u') {
925 /* Only Joliet is case insensitive by default */
926 if (joliet_level)
927 opt.check = 'r';
928 else
929 opt.check = 's';
930 }
931 sbi->s_joliet_level = joliet_level;
932
933 /* Make sure the root inode is a directory */
934 if (!S_ISDIR(inode->i_mode)) {
935 printk(KERN_WARNING
936 "isofs_fill_super: root inode is not a directory. "
937 "Corrupted media?\n");
938 goto out_iput;
939 }
940
941 table = 0;
942 if (joliet_level)
943 table += 2;
944 if (opt.check == 'r')
945 table++;
946
947 s->s_d_op = &isofs_dentry_ops[table];
948
949 /* get the root dentry */
950 s->s_root = d_alloc_root(inode);
951 if (!(s->s_root))
952 goto out_no_root;
953
954 kfree(opt.iocharset);
955
956 return 0;
957
958 /*
959 * Display error messages and free resources.
960 */
961 out_iput:
962 iput(inode);
963 goto out_no_inode;
964 out_no_root:
965 error = PTR_ERR(inode);
966 if (error != -ENOMEM)
967 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
968 out_no_inode:
969 #ifdef CONFIG_JOLIET
970 unload_nls(sbi->s_nls_iocharset);
971 #endif
972 goto out_freesbi;
973 out_no_read:
974 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
975 __func__, s->s_id, iso_blknum, block);
976 goto out_freebh;
977 out_bad_zone_size:
978 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
979 sbi->s_log_zone_size);
980 goto out_freebh;
981 out_bad_size:
982 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
983 orig_zonesize, opt.blocksize);
984 goto out_freebh;
985 out_unknown_format:
986 if (!silent)
987 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
988
989 out_freebh:
990 brelse(bh);
991 brelse(pri_bh);
992 out_freesbi:
993 kfree(opt.iocharset);
994 kfree(sbi);
995 s->s_fs_info = NULL;
996 return error;
997 }
998
999 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1000 {
1001 struct super_block *sb = dentry->d_sb;
1002 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1003
1004 buf->f_type = ISOFS_SUPER_MAGIC;
1005 buf->f_bsize = sb->s_blocksize;
1006 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1007 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1008 buf->f_bfree = 0;
1009 buf->f_bavail = 0;
1010 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1011 buf->f_ffree = 0;
1012 buf->f_fsid.val[0] = (u32)id;
1013 buf->f_fsid.val[1] = (u32)(id >> 32);
1014 buf->f_namelen = NAME_MAX;
1015 return 0;
1016 }
1017
1018 /*
1019 * Get a set of blocks; filling in buffer_heads if already allocated
1020 * or getblk() if they are not. Returns the number of blocks inserted
1021 * (-ve == error.)
1022 */
1023 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1024 struct buffer_head **bh, unsigned long nblocks)
1025 {
1026 unsigned long b_off = iblock;
1027 unsigned offset, sect_size;
1028 unsigned int firstext;
1029 unsigned long nextblk, nextoff;
1030 int section, rv, error;
1031 struct iso_inode_info *ei = ISOFS_I(inode);
1032
1033 error = -EIO;
1034 rv = 0;
1035 if (iblock != b_off) {
1036 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1037 goto abort;
1038 }
1039
1040
1041 offset = 0;
1042 firstext = ei->i_first_extent;
1043 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1044 nextblk = ei->i_next_section_block;
1045 nextoff = ei->i_next_section_offset;
1046 section = 0;
1047
1048 while (nblocks) {
1049 /* If we are *way* beyond the end of the file, print a message.
1050 * Access beyond the end of the file up to the next page boundary
1051 * is normal, however because of the way the page cache works.
1052 * In this case, we just return 0 so that we can properly fill
1053 * the page with useless information without generating any
1054 * I/O errors.
1055 */
1056 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1057 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1058 __func__, b_off,
1059 (unsigned long long)inode->i_size);
1060 goto abort;
1061 }
1062
1063 /* On the last section, nextblk == 0, section size is likely to
1064 * exceed sect_size by a partial block, and access beyond the
1065 * end of the file will reach beyond the section size, too.
1066 */
1067 while (nextblk && (b_off >= (offset + sect_size))) {
1068 struct inode *ninode;
1069
1070 offset += sect_size;
1071 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1072 if (IS_ERR(ninode)) {
1073 error = PTR_ERR(ninode);
1074 goto abort;
1075 }
1076 firstext = ISOFS_I(ninode)->i_first_extent;
1077 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1078 nextblk = ISOFS_I(ninode)->i_next_section_block;
1079 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1080 iput(ninode);
1081
1082 if (++section > 100) {
1083 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1084 " aborting...\n", __func__);
1085 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1086 "nextblk=%lu nextoff=%lu\n", __func__,
1087 b_off, firstext, (unsigned) sect_size,
1088 nextblk, nextoff);
1089 goto abort;
1090 }
1091 }
1092
1093 if (*bh) {
1094 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1095 } else {
1096 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1097 if (!*bh)
1098 goto abort;
1099 }
1100 bh++; /* Next buffer head */
1101 b_off++; /* Next buffer offset */
1102 nblocks--;
1103 rv++;
1104 }
1105
1106 error = 0;
1107 abort:
1108 return rv != 0 ? rv : error;
1109 }
1110
1111 /*
1112 * Used by the standard interfaces.
1113 */
1114 static int isofs_get_block(struct inode *inode, sector_t iblock,
1115 struct buffer_head *bh_result, int create)
1116 {
1117 int ret;
1118
1119 if (create) {
1120 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1121 return -EROFS;
1122 }
1123
1124 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1125 return ret < 0 ? ret : 0;
1126 }
1127
1128 static int isofs_bmap(struct inode *inode, sector_t block)
1129 {
1130 struct buffer_head dummy;
1131 int error;
1132
1133 dummy.b_state = 0;
1134 dummy.b_blocknr = -1000;
1135 error = isofs_get_block(inode, block, &dummy, 0);
1136 if (!error)
1137 return dummy.b_blocknr;
1138 return 0;
1139 }
1140
1141 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1142 {
1143 sector_t blknr = isofs_bmap(inode, block);
1144 if (!blknr)
1145 return NULL;
1146 return sb_bread(inode->i_sb, blknr);
1147 }
1148
1149 static int isofs_readpage(struct file *file, struct page *page)
1150 {
1151 return block_read_full_page(page,isofs_get_block);
1152 }
1153
1154 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1155 {
1156 return generic_block_bmap(mapping,block,isofs_get_block);
1157 }
1158
1159 static const struct address_space_operations isofs_aops = {
1160 .readpage = isofs_readpage,
1161 .bmap = _isofs_bmap
1162 };
1163
1164 static int isofs_read_level3_size(struct inode *inode)
1165 {
1166 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1167 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1168 struct buffer_head *bh = NULL;
1169 unsigned long block, offset, block_saved, offset_saved;
1170 int i = 0;
1171 int more_entries = 0;
1172 struct iso_directory_record *tmpde = NULL;
1173 struct iso_inode_info *ei = ISOFS_I(inode);
1174
1175 inode->i_size = 0;
1176
1177 /* The first 16 blocks are reserved as the System Area. Thus,
1178 * no inodes can appear in block 0. We use this to flag that
1179 * this is the last section. */
1180 ei->i_next_section_block = 0;
1181 ei->i_next_section_offset = 0;
1182
1183 block = ei->i_iget5_block;
1184 offset = ei->i_iget5_offset;
1185
1186 do {
1187 struct iso_directory_record *de;
1188 unsigned int de_len;
1189
1190 if (!bh) {
1191 bh = sb_bread(inode->i_sb, block);
1192 if (!bh)
1193 goto out_noread;
1194 }
1195 de = (struct iso_directory_record *) (bh->b_data + offset);
1196 de_len = *(unsigned char *) de;
1197
1198 if (de_len == 0) {
1199 brelse(bh);
1200 bh = NULL;
1201 ++block;
1202 offset = 0;
1203 continue;
1204 }
1205
1206 block_saved = block;
1207 offset_saved = offset;
1208 offset += de_len;
1209
1210 /* Make sure we have a full directory entry */
1211 if (offset >= bufsize) {
1212 int slop = bufsize - offset + de_len;
1213 if (!tmpde) {
1214 tmpde = kmalloc(256, GFP_KERNEL);
1215 if (!tmpde)
1216 goto out_nomem;
1217 }
1218 memcpy(tmpde, de, slop);
1219 offset &= bufsize - 1;
1220 block++;
1221 brelse(bh);
1222 bh = NULL;
1223 if (offset) {
1224 bh = sb_bread(inode->i_sb, block);
1225 if (!bh)
1226 goto out_noread;
1227 memcpy((void *)tmpde+slop, bh->b_data, offset);
1228 }
1229 de = tmpde;
1230 }
1231
1232 inode->i_size += isonum_733(de->size);
1233 if (i == 1) {
1234 ei->i_next_section_block = block_saved;
1235 ei->i_next_section_offset = offset_saved;
1236 }
1237
1238 more_entries = de->flags[-high_sierra] & 0x80;
1239
1240 i++;
1241 if (i > 100)
1242 goto out_toomany;
1243 } while (more_entries);
1244 out:
1245 kfree(tmpde);
1246 if (bh)
1247 brelse(bh);
1248 return 0;
1249
1250 out_nomem:
1251 if (bh)
1252 brelse(bh);
1253 return -ENOMEM;
1254
1255 out_noread:
1256 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1257 kfree(tmpde);
1258 return -EIO;
1259
1260 out_toomany:
1261 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1262 "isofs_read_level3_size: inode=%lu\n",
1263 __func__, inode->i_ino);
1264 goto out;
1265 }
1266
1267 static int isofs_read_inode(struct inode *inode)
1268 {
1269 struct super_block *sb = inode->i_sb;
1270 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1271 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1272 unsigned long block;
1273 int high_sierra = sbi->s_high_sierra;
1274 struct buffer_head *bh = NULL;
1275 struct iso_directory_record *de;
1276 struct iso_directory_record *tmpde = NULL;
1277 unsigned int de_len;
1278 unsigned long offset;
1279 struct iso_inode_info *ei = ISOFS_I(inode);
1280 int ret = -EIO;
1281
1282 block = ei->i_iget5_block;
1283 bh = sb_bread(inode->i_sb, block);
1284 if (!bh)
1285 goto out_badread;
1286
1287 offset = ei->i_iget5_offset;
1288
1289 de = (struct iso_directory_record *) (bh->b_data + offset);
1290 de_len = *(unsigned char *) de;
1291
1292 if (offset + de_len > bufsize) {
1293 int frag1 = bufsize - offset;
1294
1295 tmpde = kmalloc(de_len, GFP_KERNEL);
1296 if (tmpde == NULL) {
1297 printk(KERN_INFO "%s: out of memory\n", __func__);
1298 ret = -ENOMEM;
1299 goto fail;
1300 }
1301 memcpy(tmpde, bh->b_data + offset, frag1);
1302 brelse(bh);
1303 bh = sb_bread(inode->i_sb, ++block);
1304 if (!bh)
1305 goto out_badread;
1306 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1307 de = tmpde;
1308 }
1309
1310 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1311 ei->i_iget5_offset,
1312 ISOFS_BUFFER_BITS(inode));
1313
1314 /* Assume it is a normal-format file unless told otherwise */
1315 ei->i_file_format = isofs_file_normal;
1316
1317 if (de->flags[-high_sierra] & 2) {
1318 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1319 inode->i_mode = S_IFDIR | sbi->s_dmode;
1320 else
1321 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1322 inode->i_nlink = 1; /*
1323 * Set to 1. We know there are 2, but
1324 * the find utility tries to optimize
1325 * if it is 2, and it screws up. It is
1326 * easier to give 1 which tells find to
1327 * do it the hard way.
1328 */
1329 } else {
1330 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1331 inode->i_mode = S_IFREG | sbi->s_fmode;
1332 } else {
1333 /*
1334 * Set default permissions: r-x for all. The disc
1335 * could be shared with DOS machines so virtually
1336 * anything could be a valid executable.
1337 */
1338 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1339 }
1340 inode->i_nlink = 1;
1341 }
1342 inode->i_uid = sbi->s_uid;
1343 inode->i_gid = sbi->s_gid;
1344 inode->i_blocks = 0;
1345
1346 ei->i_format_parm[0] = 0;
1347 ei->i_format_parm[1] = 0;
1348 ei->i_format_parm[2] = 0;
1349
1350 ei->i_section_size = isonum_733(de->size);
1351 if (de->flags[-high_sierra] & 0x80) {
1352 ret = isofs_read_level3_size(inode);
1353 if (ret < 0)
1354 goto fail;
1355 ret = -EIO;
1356 } else {
1357 ei->i_next_section_block = 0;
1358 ei->i_next_section_offset = 0;
1359 inode->i_size = isonum_733(de->size);
1360 }
1361
1362 /*
1363 * Some dipshit decided to store some other bit of information
1364 * in the high byte of the file length. Truncate size in case
1365 * this CDROM was mounted with the cruft option.
1366 */
1367
1368 if (sbi->s_cruft)
1369 inode->i_size &= 0x00ffffff;
1370
1371 if (de->interleave[0]) {
1372 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1373 inode->i_size = 0;
1374 }
1375
1376 /* I have no idea what file_unit_size is used for, so
1377 we will flag it for now */
1378 if (de->file_unit_size[0] != 0) {
1379 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1380 inode->i_ino);
1381 }
1382
1383 /* I have no idea what other flag bits are used for, so
1384 we will flag it for now */
1385 #ifdef DEBUG
1386 if((de->flags[-high_sierra] & ~2)!= 0){
1387 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1388 "(%ld %x).\n",
1389 inode->i_ino, de->flags[-high_sierra]);
1390 }
1391 #endif
1392
1393 inode->i_mtime.tv_sec =
1394 inode->i_atime.tv_sec =
1395 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1396 inode->i_mtime.tv_nsec =
1397 inode->i_atime.tv_nsec =
1398 inode->i_ctime.tv_nsec = 0;
1399
1400 ei->i_first_extent = (isonum_733(de->extent) +
1401 isonum_711(de->ext_attr_length));
1402
1403 /* Set the number of blocks for stat() - should be done before RR */
1404 inode->i_blocks = (inode->i_size + 511) >> 9;
1405
1406 /*
1407 * Now test for possible Rock Ridge extensions which will override
1408 * some of these numbers in the inode structure.
1409 */
1410
1411 if (!high_sierra) {
1412 parse_rock_ridge_inode(de, inode);
1413 /* if we want uid/gid set, override the rock ridge setting */
1414 if (sbi->s_uid_set)
1415 inode->i_uid = sbi->s_uid;
1416 if (sbi->s_gid_set)
1417 inode->i_gid = sbi->s_gid;
1418 }
1419 /* Now set final access rights if overriding rock ridge setting */
1420 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1421 sbi->s_dmode != ISOFS_INVALID_MODE)
1422 inode->i_mode = S_IFDIR | sbi->s_dmode;
1423 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1424 sbi->s_fmode != ISOFS_INVALID_MODE)
1425 inode->i_mode = S_IFREG | sbi->s_fmode;
1426
1427 /* Install the inode operations vector */
1428 if (S_ISREG(inode->i_mode)) {
1429 inode->i_fop = &generic_ro_fops;
1430 switch (ei->i_file_format) {
1431 #ifdef CONFIG_ZISOFS
1432 case isofs_file_compressed:
1433 inode->i_data.a_ops = &zisofs_aops;
1434 break;
1435 #endif
1436 default:
1437 inode->i_data.a_ops = &isofs_aops;
1438 break;
1439 }
1440 } else if (S_ISDIR(inode->i_mode)) {
1441 inode->i_op = &isofs_dir_inode_operations;
1442 inode->i_fop = &isofs_dir_operations;
1443 } else if (S_ISLNK(inode->i_mode)) {
1444 inode->i_op = &page_symlink_inode_operations;
1445 inode->i_data.a_ops = &isofs_symlink_aops;
1446 } else
1447 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1448 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1449
1450 ret = 0;
1451 out:
1452 kfree(tmpde);
1453 if (bh)
1454 brelse(bh);
1455 return ret;
1456
1457 out_badread:
1458 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1459 fail:
1460 goto out;
1461 }
1462
1463 struct isofs_iget5_callback_data {
1464 unsigned long block;
1465 unsigned long offset;
1466 };
1467
1468 static int isofs_iget5_test(struct inode *ino, void *data)
1469 {
1470 struct iso_inode_info *i = ISOFS_I(ino);
1471 struct isofs_iget5_callback_data *d =
1472 (struct isofs_iget5_callback_data*)data;
1473 return (i->i_iget5_block == d->block)
1474 && (i->i_iget5_offset == d->offset);
1475 }
1476
1477 static int isofs_iget5_set(struct inode *ino, void *data)
1478 {
1479 struct iso_inode_info *i = ISOFS_I(ino);
1480 struct isofs_iget5_callback_data *d =
1481 (struct isofs_iget5_callback_data*)data;
1482 i->i_iget5_block = d->block;
1483 i->i_iget5_offset = d->offset;
1484 return 0;
1485 }
1486
1487 /* Store, in the inode's containing structure, the block and block
1488 * offset that point to the underlying meta-data for the inode. The
1489 * code below is otherwise similar to the iget() code in
1490 * include/linux/fs.h */
1491 struct inode *isofs_iget(struct super_block *sb,
1492 unsigned long block,
1493 unsigned long offset)
1494 {
1495 unsigned long hashval;
1496 struct inode *inode;
1497 struct isofs_iget5_callback_data data;
1498 long ret;
1499
1500 if (offset >= 1ul << sb->s_blocksize_bits)
1501 return ERR_PTR(-EINVAL);
1502
1503 data.block = block;
1504 data.offset = offset;
1505
1506 hashval = (block << sb->s_blocksize_bits) | offset;
1507
1508 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1509 &isofs_iget5_set, &data);
1510
1511 if (!inode)
1512 return ERR_PTR(-ENOMEM);
1513
1514 if (inode->i_state & I_NEW) {
1515 ret = isofs_read_inode(inode);
1516 if (ret < 0) {
1517 iget_failed(inode);
1518 inode = ERR_PTR(ret);
1519 } else {
1520 unlock_new_inode(inode);
1521 }
1522 }
1523
1524 return inode;
1525 }
1526
1527 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1528 int flags, const char *dev_name, void *data)
1529 {
1530 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1531 }
1532
1533 static struct file_system_type iso9660_fs_type = {
1534 .owner = THIS_MODULE,
1535 .name = "iso9660",
1536 .mount = isofs_mount,
1537 .kill_sb = kill_block_super,
1538 .fs_flags = FS_REQUIRES_DEV,
1539 };
1540
1541 static int __init init_iso9660_fs(void)
1542 {
1543 int err = init_inodecache();
1544 if (err)
1545 goto out;
1546 #ifdef CONFIG_ZISOFS
1547 err = zisofs_init();
1548 if (err)
1549 goto out1;
1550 #endif
1551 err = register_filesystem(&iso9660_fs_type);
1552 if (err)
1553 goto out2;
1554 return 0;
1555 out2:
1556 #ifdef CONFIG_ZISOFS
1557 zisofs_cleanup();
1558 out1:
1559 #endif
1560 destroy_inodecache();
1561 out:
1562 return err;
1563 }
1564
1565 static void __exit exit_iso9660_fs(void)
1566 {
1567 unregister_filesystem(&iso9660_fs_type);
1568 #ifdef CONFIG_ZISOFS
1569 zisofs_cleanup();
1570 #endif
1571 destroy_inodecache();
1572 }
1573
1574 module_init(init_iso9660_fs)
1575 module_exit(exit_iso9660_fs)
1576 MODULE_LICENSE("GPL");
1577 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1578 MODULE_ALIAS("iso9660");
Linux Btrfs Development