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