Line data Source code
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 :
42 : static void isofs_put_super(struct super_block *sb)
43 : {
44 4 : struct isofs_sb_info *sbi = ISOFS_SB(sb);
45 1 :
46 : #ifdef CONFIG_JOLIET
47 1 : lock_kernel();
48 :
49 1 : unload_nls(sbi->s_nls_iocharset);
50 :
51 1 : unlock_kernel();
52 : #endif
53 :
54 1 : kfree(sbi);
55 1 : sb->s_fs_info = NULL;
56 1 : return;
57 : }
58 :
59 : static int isofs_read_inode(struct inode *);
60 : static int isofs_statfs (struct dentry *, struct kstatfs *);
61 :
62 1 : static struct kmem_cache *isofs_inode_cachep;
63 :
64 : static struct inode *isofs_alloc_inode(struct super_block *sb)
65 : {
66 1 : struct iso_inode_info *ei;
67 3 : ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
68 2 : if (!ei)
69 1 : return NULL;
70 1 : return &ei->vfs_inode;
71 : }
72 :
73 : static void isofs_destroy_inode(struct inode *inode)
74 : {
75 4 : kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
76 1 : }
77 :
78 : static void init_once(void *foo)
79 : {
80 0 : struct iso_inode_info *ei = foo;
81 :
82 0 : inode_init_once(&ei->vfs_inode);
83 0 : }
84 :
85 : static int init_inodecache(void)
86 : {
87 1 : isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
88 : sizeof(struct iso_inode_info),
89 : 0, (SLAB_RECLAIM_ACCOUNT|
90 : SLAB_MEM_SPREAD),
91 : init_once);
92 2 : if (isofs_inode_cachep == NULL)
93 1 : return -ENOMEM;
94 1 : return 0;
95 : }
96 :
97 : static void destroy_inodecache(void)
98 : {
99 3 : kmem_cache_destroy(isofs_inode_cachep);
100 3 : }
101 :
102 : static int isofs_remount(struct super_block *sb, int *flags, char *data)
103 : {
104 : /* we probably want a lot more here */
105 1 : *flags |= MS_RDONLY;
106 1 : return 0;
107 : }
108 :
109 1 : static const struct super_operations isofs_sops = {
110 : .alloc_inode = isofs_alloc_inode,
111 : .destroy_inode = isofs_destroy_inode,
112 : .put_super = isofs_put_super,
113 : .statfs = isofs_statfs,
114 : .remount_fs = isofs_remount,
115 : .show_options = generic_show_options,
116 : };
117 :
118 :
119 1 : static const struct dentry_operations isofs_dentry_ops[] = {
120 : {
121 : .d_hash = isofs_hash,
122 : .d_compare = isofs_dentry_cmp,
123 : },
124 : {
125 : .d_hash = isofs_hashi,
126 : .d_compare = isofs_dentry_cmpi,
127 : },
128 : #ifdef CONFIG_JOLIET
129 : {
130 : .d_hash = isofs_hash_ms,
131 : .d_compare = isofs_dentry_cmp_ms,
132 : },
133 : {
134 : .d_hash = isofs_hashi_ms,
135 : .d_compare = isofs_dentry_cmpi_ms,
136 1 : },
137 : #endif
138 : };
139 :
140 : struct iso9660_options{
141 : unsigned int rock:1;
142 : unsigned int joliet:1;
143 : unsigned int cruft:1;
144 : unsigned int hide:1;
145 : unsigned int showassoc:1;
146 : unsigned int nocompress:1;
147 : unsigned int overriderockperm:1;
148 : unsigned int uid_set:1;
149 : unsigned int gid_set:1;
150 : unsigned int utf8:1;
151 : unsigned char map;
152 : unsigned char check;
153 : unsigned int blocksize;
154 : mode_t fmode;
155 : mode_t dmode;
156 : gid_t gid;
157 : uid_t uid;
158 : char *iocharset;
159 : /* LVE */
160 : s32 session;
161 : s32 sbsector;
162 : };
163 :
164 : /*
165 : * Compute the hash for the isofs name corresponding to the dentry.
166 : */
167 : static int
168 : isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
169 : {
170 2 : const char *name;
171 2 : int len;
172 :
173 4 : len = qstr->len;
174 4 : name = qstr->name;
175 4 : if (ms) {
176 10 : while (len && name[len-1] == '.')
177 4 : len--;
178 4 : }
179 :
180 8 : qstr->hash = full_name_hash(name, len);
181 :
182 2 : return 0;
183 : }
184 :
185 : /*
186 : * Compute the hash for the isofs name corresponding to the dentry.
187 : */
188 : static int
189 : isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
190 : {
191 2 : const char *name;
192 2 : int len;
193 2 : char c;
194 2 : unsigned long hash;
195 2 :
196 6 : len = qstr->len;
197 6 : name = qstr->name;
198 6 : if (ms) {
199 10 : while (len && name[len-1] == '.')
200 4 : len--;
201 4 : }
202 :
203 4 : hash = init_name_hash();
204 12 : while (len--) {
205 12 : c = tolower(*name++);
206 6 : hash = partial_name_hash(c, hash);
207 : }
208 8 : qstr->hash = end_name_hash(hash);
209 :
210 2 : return 0;
211 : }
212 :
213 : /*
214 : * Case insensitive compare of two isofs names.
215 : */
216 : static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
217 : struct qstr *b, int ms)
218 : {
219 2 : int alen, blen;
220 2 :
221 2 : /* A filename cannot end in '.' or we treat it like it has none */
222 4 : alen = a->len;
223 4 : blen = b->len;
224 4 : if (ms) {
225 10 : while (alen && a->name[alen-1] == '.')
226 4 : alen--;
227 14 : while (blen && b->name[blen-1] == '.')
228 4 : blen--;
229 4 : }
230 8 : if (alen == blen) {
231 20 : if (strnicmp(a->name, b->name, alen) == 0)
232 4 : return 0;
233 : }
234 4 : return 1;
235 : }
236 :
237 : /*
238 : * Case sensitive compare of two isofs names.
239 : */
240 : static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
241 : struct qstr *b, int ms)
242 : {
243 2 : int alen, blen;
244 2 :
245 2 : /* A filename cannot end in '.' or we treat it like it has none */
246 4 : alen = a->len;
247 4 : blen = b->len;
248 4 : if (ms) {
249 10 : while (alen && a->name[alen-1] == '.')
250 4 : alen--;
251 14 : while (blen && b->name[blen-1] == '.')
252 4 : blen--;
253 4 : }
254 8 : if (alen == blen) {
255 20 : if (strncmp(a->name, b->name, alen) == 0)
256 4 : return 0;
257 : }
258 4 : return 1;
259 : }
260 :
261 : static int
262 : isofs_hash(struct dentry *dentry, struct qstr *qstr)
263 : {
264 4 : return isofs_hash_common(dentry, qstr, 0);
265 : }
266 :
267 : static int
268 : isofs_hashi(struct dentry *dentry, struct qstr *qstr)
269 : {
270 4 : return isofs_hashi_common(dentry, qstr, 0);
271 : }
272 :
273 : static int
274 : isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
275 : {
276 5 : return isofs_dentry_cmp_common(dentry, a, b, 0);
277 : }
278 :
279 : static int
280 : isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
281 : {
282 5 : return isofs_dentry_cmpi_common(dentry, a, b, 0);
283 : }
284 :
285 : #ifdef CONFIG_JOLIET
286 : static int
287 : isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
288 : {
289 4 : return isofs_hash_common(dentry, qstr, 1);
290 : }
291 :
292 : static int
293 : isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
294 : {
295 4 : return isofs_hashi_common(dentry, qstr, 1);
296 : }
297 :
298 : static int
299 : isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
300 : {
301 5 : return isofs_dentry_cmp_common(dentry, a, b, 1);
302 : }
303 :
304 : static int
305 : isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
306 : {
307 5 : return isofs_dentry_cmpi_common(dentry, a, b, 1);
308 : }
309 : #endif
310 :
311 : enum {
312 : Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
313 : Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
314 : Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
315 : Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
316 : };
317 :
318 1 : static const match_table_t tokens = {
319 : {Opt_norock, "norock"},
320 : {Opt_nojoliet, "nojoliet"},
321 : {Opt_unhide, "unhide"},
322 : {Opt_hide, "hide"},
323 : {Opt_showassoc, "showassoc"},
324 : {Opt_cruft, "cruft"},
325 : {Opt_utf8, "utf8"},
326 : {Opt_iocharset, "iocharset=%s"},
327 : {Opt_map_a, "map=acorn"},
328 : {Opt_map_a, "map=a"},
329 : {Opt_map_n, "map=normal"},
330 : {Opt_map_n, "map=n"},
331 : {Opt_map_o, "map=off"},
332 : {Opt_map_o, "map=o"},
333 : {Opt_session, "session=%u"},
334 : {Opt_sb, "sbsector=%u"},
335 : {Opt_check_r, "check=relaxed"},
336 : {Opt_check_r, "check=r"},
337 : {Opt_check_s, "check=strict"},
338 : {Opt_check_s, "check=s"},
339 : {Opt_uid, "uid=%u"},
340 : {Opt_gid, "gid=%u"},
341 : {Opt_mode, "mode=%u"},
342 : {Opt_dmode, "dmode=%u"},
343 : {Opt_overriderockperm, "overriderockperm"},
344 : {Opt_block, "block=%u"},
345 : {Opt_ignore, "conv=binary"},
346 : {Opt_ignore, "conv=b"},
347 : {Opt_ignore, "conv=text"},
348 : {Opt_ignore, "conv=t"},
349 : {Opt_ignore, "conv=mtext"},
350 : {Opt_ignore, "conv=m"},
351 : {Opt_ignore, "conv=auto"},
352 : {Opt_ignore, "conv=a"},
353 : {Opt_nocompress, "nocompress"},
354 : {Opt_err, NULL}
355 : };
356 :
357 : static int parse_options(char *options, struct iso9660_options *popt)
358 : {
359 0 : char *p;
360 0 : int option;
361 0 :
362 0 : popt->map = 'n';
363 0 : popt->rock = 1;
364 0 : popt->joliet = 1;
365 0 : popt->cruft = 0;
366 0 : popt->hide = 0;
367 0 : popt->showassoc = 0;
368 0 : popt->check = 'u'; /* unset */
369 0 : popt->nocompress = 0;
370 0 : popt->blocksize = 1024;
371 0 : popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
372 0 : popt->uid_set = 0;
373 0 : popt->gid_set = 0;
374 0 : popt->gid = 0;
375 0 : popt->uid = 0;
376 0 : popt->iocharset = NULL;
377 0 : popt->utf8 = 0;
378 0 : popt->overriderockperm = 0;
379 0 : popt->session=-1;
380 0 : popt->sbsector=-1;
381 0 : if (!options)
382 0 : return 1;
383 :
384 0 : while ((p = strsep(&options, ",")) != NULL) {
385 0 : int token;
386 0 : substring_t args[MAX_OPT_ARGS];
387 : unsigned n;
388 :
389 0 : if (!*p)
390 0 : continue;
391 :
392 0 : token = match_token(p, tokens, args);
393 : switch (token) {
394 0 : case Opt_norock:
395 0 : popt->rock = 0;
396 0 : break;
397 0 : case Opt_nojoliet:
398 0 : popt->joliet = 0;
399 0 : break;
400 0 : case Opt_hide:
401 0 : popt->hide = 1;
402 0 : break;
403 0 : case Opt_unhide:
404 0 : case Opt_showassoc:
405 0 : popt->showassoc = 1;
406 0 : break;
407 0 : case Opt_cruft:
408 0 : popt->cruft = 1;
409 0 : break;
410 0 : case Opt_utf8:
411 0 : popt->utf8 = 1;
412 0 : break;
413 0 : #ifdef CONFIG_JOLIET
414 0 : case Opt_iocharset:
415 0 : popt->iocharset = match_strdup(&args[0]);
416 0 : break;
417 0 : #endif
418 0 : case Opt_map_a:
419 0 : popt->map = 'a';
420 0 : break;
421 0 : case Opt_map_o:
422 0 : popt->map = 'o';
423 0 : break;
424 0 : case Opt_map_n:
425 0 : popt->map = 'n';
426 0 : break;
427 0 : case Opt_session:
428 0 : if (match_int(&args[0], &option))
429 0 : return 0;
430 0 : n = option;
431 0 : if (n > 99)
432 0 : return 0;
433 0 : popt->session = n + 1;
434 0 : break;
435 0 : case Opt_sb:
436 0 : if (match_int(&args[0], &option))
437 0 : return 0;
438 0 : popt->sbsector = option;
439 0 : break;
440 0 : case Opt_check_r:
441 0 : popt->check = 'r';
442 0 : break;
443 0 : case Opt_check_s:
444 0 : popt->check = 's';
445 0 : break;
446 0 : case Opt_ignore:
447 0 : break;
448 0 : case Opt_uid:
449 0 : if (match_int(&args[0], &option))
450 0 : return 0;
451 0 : popt->uid = option;
452 0 : popt->uid_set = 1;
453 0 : break;
454 0 : case Opt_gid:
455 0 : if (match_int(&args[0], &option))
456 0 : return 0;
457 0 : popt->gid = option;
458 0 : popt->gid_set = 1;
459 0 : break;
460 0 : case Opt_mode:
461 0 : if (match_int(&args[0], &option))
462 0 : return 0;
463 0 : popt->fmode = option;
464 0 : break;
465 0 : case Opt_dmode:
466 0 : if (match_int(&args[0], &option))
467 0 : return 0;
468 0 : popt->dmode = option;
469 0 : break;
470 0 : case Opt_overriderockperm:
471 0 : popt->overriderockperm = 1;
472 0 : break;
473 0 : case Opt_block:
474 0 : if (match_int(&args[0], &option))
475 0 : return 0;
476 0 : n = option;
477 0 : if (n != 512 && n != 1024 && n != 2048)
478 0 : return 0;
479 0 : popt->blocksize = n;
480 0 : break;
481 0 : case Opt_nocompress:
482 0 : popt->nocompress = 1;
483 0 : break;
484 0 : default:
485 0 : return 0;
486 : }
487 : }
488 0 : return 1;
489 0 : }
490 :
491 : /*
492 : * look if the driver can tell the multi session redirection value
493 : *
494 : * don't change this if you don't know what you do, please!
495 : * Multisession is legal only with XA disks.
496 : * A non-XA disk with more than one volume descriptor may do it right, but
497 : * usually is written in a nowhere standardized "multi-partition" manner.
498 : * Multisession uses absolute addressing (solely the first frame of the whole
499 : * track is #0), multi-partition uses relative addressing (each first frame of
500 : * each track is #0), and a track is not a session.
501 : *
502 : * A broken CDwriter software or drive firmware does not set new standards,
503 : * at least not if conflicting with the existing ones.
504 : *
505 : * emoenke@gwdg.de
506 : */
507 : #define WE_OBEY_THE_WRITTEN_STANDARDS 1
508 :
509 : static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
510 : {
511 0 : struct cdrom_multisession ms_info;
512 0 : unsigned int vol_desc_start;
513 0 : struct block_device *bdev = sb->s_bdev;
514 0 : int i;
515 0 :
516 0 : vol_desc_start=0;
517 0 : ms_info.addr_format=CDROM_LBA;
518 0 : if(session >= 0 && session <= 99) {
519 : struct cdrom_tocentry Te;
520 0 : Te.cdte_track=session;
521 0 : Te.cdte_format=CDROM_LBA;
522 0 : i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
523 0 : if (!i) {
524 0 : printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
525 : session, Te.cdte_addr.lba,
526 : Te.cdte_ctrl&CDROM_DATA_TRACK);
527 0 : if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
528 0 : return Te.cdte_addr.lba;
529 : }
530 :
531 0 : printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
532 : }
533 0 : i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
534 0 : if (session > 0)
535 0 : printk(KERN_ERR "ISOFS: Invalid session number\n");
536 : #if 0
537 : printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
538 : if (i==0) {
539 : printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
540 : printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
541 : }
542 : #endif
543 0 : if (i==0)
544 : #if WE_OBEY_THE_WRITTEN_STANDARDS
545 0 : if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
546 : #endif
547 0 : vol_desc_start=ms_info.addr.lba;
548 0 : return vol_desc_start;
549 : }
550 :
551 : /*
552 : * Initialize the superblock and read the root inode.
553 : *
554 : * Note: a check_disk_change() has been done immediately prior
555 : * to this call, so we don't need to check again.
556 : */
557 : static int isofs_fill_super(struct super_block *s, void *data, int silent)
558 : {
559 0 : struct buffer_head *bh = NULL, *pri_bh = NULL;
560 0 : struct hs_primary_descriptor *h_pri = NULL;
561 0 : struct iso_primary_descriptor *pri = NULL;
562 0 : struct iso_supplementary_descriptor *sec = NULL;
563 0 : struct iso_directory_record *rootp;
564 0 : struct inode *inode;
565 0 : struct iso9660_options opt;
566 0 : struct isofs_sb_info *sbi;
567 0 : unsigned long first_data_zone;
568 0 : int joliet_level = 0;
569 0 : int iso_blknum, block;
570 0 : int orig_zonesize;
571 0 : int table, error = -EINVAL;
572 0 : unsigned int vol_desc_start;
573 0 :
574 0 : save_mount_options(s, data);
575 0 :
576 0 : sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
577 0 : if (!sbi)
578 0 : return -ENOMEM;
579 0 : s->s_fs_info = sbi;
580 0 :
581 0 : if (!parse_options((char *)data, &opt))
582 0 : goto out_freesbi;
583 0 :
584 0 : /*
585 0 : * First of all, get the hardware blocksize for this device.
586 0 : * If we don't know what it is, or the hardware blocksize is
587 0 : * larger than the blocksize the user specified, then use
588 0 : * that value.
589 0 : */
590 0 : /*
591 0 : * What if bugger tells us to go beyond page size?
592 0 : */
593 0 : opt.blocksize = sb_min_blocksize(s, opt.blocksize);
594 0 :
595 0 : sbi->s_high_sierra = 0; /* default is iso9660 */
596 0 :
597 0 : vol_desc_start = (opt.sbsector != -1) ?
598 0 : opt.sbsector : isofs_get_last_session(s,opt.session);
599 0 :
600 0 : for (iso_blknum = vol_desc_start+16;
601 0 : iso_blknum < vol_desc_start+100; iso_blknum++) {
602 : struct hs_volume_descriptor *hdp;
603 0 : struct iso_volume_descriptor *vdp;
604 :
605 0 : block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
606 0 : if (!(bh = sb_bread(s, block)))
607 0 : goto out_no_read;
608 :
609 0 : vdp = (struct iso_volume_descriptor *)bh->b_data;
610 0 : hdp = (struct hs_volume_descriptor *)bh->b_data;
611 :
612 : /*
613 : * Due to the overlapping physical location of the descriptors,
614 : * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
615 : * proper identification in this case, we first check for ISO.
616 : */
617 0 : if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
618 0 : if (isonum_711(vdp->type) == ISO_VD_END)
619 0 : break;
620 0 : if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
621 0 : if (pri == NULL) {
622 0 : pri = (struct iso_primary_descriptor *)vdp;
623 : /* Save the buffer in case we need it ... */
624 0 : pri_bh = bh;
625 0 : bh = NULL;
626 : }
627 : }
628 : #ifdef CONFIG_JOLIET
629 0 : else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
630 0 : sec = (struct iso_supplementary_descriptor *)vdp;
631 0 : if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
632 0 : if (opt.joliet) {
633 0 : if (sec->escape[2] == 0x40)
634 0 : joliet_level = 1;
635 0 : else if (sec->escape[2] == 0x43)
636 0 : joliet_level = 2;
637 0 : else if (sec->escape[2] == 0x45)
638 0 : joliet_level = 3;
639 :
640 0 : printk(KERN_DEBUG "ISO 9660 Extensions: "
641 : "Microsoft Joliet Level %d\n",
642 : joliet_level);
643 : }
644 0 : goto root_found;
645 : } else {
646 : /* Unknown supplementary volume descriptor */
647 0 : sec = NULL;
648 : }
649 : }
650 : #endif
651 : } else {
652 0 : if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
653 0 : if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
654 0 : goto out_freebh;
655 :
656 0 : sbi->s_high_sierra = 1;
657 0 : opt.rock = 0;
658 0 : h_pri = (struct hs_primary_descriptor *)vdp;
659 0 : goto root_found;
660 : }
661 : }
662 :
663 : /* Just skip any volume descriptors we don't recognize */
664 :
665 0 : brelse(bh);
666 0 : bh = NULL;
667 : }
668 : /*
669 : * If we fall through, either no volume descriptor was found,
670 : * or else we passed a primary descriptor looking for others.
671 : */
672 0 : if (!pri)
673 0 : goto out_unknown_format;
674 0 : brelse(bh);
675 0 : bh = pri_bh;
676 0 : pri_bh = NULL;
677 :
678 0 : root_found:
679 :
680 0 : if (joliet_level && (pri == NULL || !opt.rock)) {
681 : /* This is the case of Joliet with the norock mount flag.
682 : * A disc with both Joliet and Rock Ridge is handled later
683 : */
684 0 : pri = (struct iso_primary_descriptor *) sec;
685 : }
686 :
687 0 : if(sbi->s_high_sierra){
688 0 : rootp = (struct iso_directory_record *) h_pri->root_directory_record;
689 0 : sbi->s_nzones = isonum_733(h_pri->volume_space_size);
690 0 : sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
691 0 : sbi->s_max_size = isonum_733(h_pri->volume_space_size);
692 : } else {
693 0 : if (!pri)
694 0 : goto out_freebh;
695 0 : rootp = (struct iso_directory_record *) pri->root_directory_record;
696 0 : sbi->s_nzones = isonum_733(pri->volume_space_size);
697 0 : sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
698 0 : sbi->s_max_size = isonum_733(pri->volume_space_size);
699 : }
700 :
701 0 : sbi->s_ninodes = 0; /* No way to figure this out easily */
702 :
703 0 : orig_zonesize = sbi->s_log_zone_size;
704 : /*
705 : * If the zone size is smaller than the hardware sector size,
706 : * this is a fatal error. This would occur if the disc drive
707 : * had sectors that were 2048 bytes, but the filesystem had
708 : * blocks that were 512 bytes (which should only very rarely
709 : * happen.)
710 : */
711 0 : if (orig_zonesize < opt.blocksize)
712 0 : goto out_bad_size;
713 :
714 : /* RDE: convert log zone size to bit shift */
715 : switch (sbi->s_log_zone_size) {
716 0 : case 512: sbi->s_log_zone_size = 9; break;
717 0 : case 1024: sbi->s_log_zone_size = 10; break;
718 0 : case 2048: sbi->s_log_zone_size = 11; break;
719 0 :
720 0 : default:
721 0 : goto out_bad_zone_size;
722 : }
723 :
724 0 : s->s_magic = ISOFS_SUPER_MAGIC;
725 0 : s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
726 :
727 : /*
728 : * The CDROM is read-only, has no nodes (devices) on it, and since
729 : * all of the files appear to be owned by root, we really do not want
730 : * to allow suid. (suid or devices will not show up unless we have
731 : * Rock Ridge extensions)
732 : */
733 :
734 0 : s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
735 :
736 : /* Set this for reference. Its not currently used except on write
737 : which we don't have .. */
738 :
739 0 : first_data_zone = isonum_733(rootp->extent) +
740 : isonum_711(rootp->ext_attr_length);
741 0 : sbi->s_firstdatazone = first_data_zone;
742 : #ifndef BEQUIET
743 : printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
744 : sbi->s_max_size, 1UL << sbi->s_log_zone_size);
745 : printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
746 : if(sbi->s_high_sierra)
747 : printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
748 : #endif
749 :
750 : /*
751 : * If the Joliet level is set, we _may_ decide to use the
752 : * secondary descriptor, but can't be sure until after we
753 : * read the root inode. But before reading the root inode
754 : * we may need to change the device blocksize, and would
755 : * rather release the old buffer first. So, we cache the
756 : * first_data_zone value from the secondary descriptor.
757 : */
758 0 : if (joliet_level) {
759 0 : pri = (struct iso_primary_descriptor *) sec;
760 0 : rootp = (struct iso_directory_record *)
761 : pri->root_directory_record;
762 0 : first_data_zone = isonum_733(rootp->extent) +
763 : isonum_711(rootp->ext_attr_length);
764 : }
765 :
766 : /*
767 : * We're all done using the volume descriptor, and may need
768 : * to change the device blocksize, so release the buffer now.
769 : */
770 0 : brelse(pri_bh);
771 0 : brelse(bh);
772 :
773 : /*
774 : * Force the blocksize to 512 for 512 byte sectors. The file
775 : * read primitives really get it wrong in a bad way if we don't
776 : * do this.
777 : *
778 : * Note - we should never be setting the blocksize to something
779 : * less than the hardware sector size for the device. If we
780 : * do, we would end up having to read larger buffers and split
781 : * out portions to satisfy requests.
782 : *
783 : * Note2- the idea here is that we want to deal with the optimal
784 : * zonesize in the filesystem. If we have it set to something less,
785 : * then we have horrible problems with trying to piece together
786 : * bits of adjacent blocks in order to properly read directory
787 : * entries. By forcing the blocksize in this way, we ensure
788 : * that we will never be required to do this.
789 : */
790 0 : sb_set_blocksize(s, orig_zonesize);
791 :
792 0 : sbi->s_nls_iocharset = NULL;
793 :
794 : #ifdef CONFIG_JOLIET
795 0 : if (joliet_level && opt.utf8 == 0) {
796 0 : char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
797 0 : sbi->s_nls_iocharset = load_nls(p);
798 0 : if (! sbi->s_nls_iocharset) {
799 : /* Fail only if explicit charset specified */
800 0 : if (opt.iocharset)
801 0 : goto out_freesbi;
802 0 : sbi->s_nls_iocharset = load_nls_default();
803 : }
804 : }
805 : #endif
806 0 : s->s_op = &isofs_sops;
807 0 : s->s_export_op = &isofs_export_ops;
808 0 : sbi->s_mapping = opt.map;
809 0 : sbi->s_rock = (opt.rock ? 2 : 0);
810 0 : sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
811 0 : sbi->s_cruft = opt.cruft;
812 0 : sbi->s_hide = opt.hide;
813 0 : sbi->s_showassoc = opt.showassoc;
814 0 : sbi->s_uid = opt.uid;
815 0 : sbi->s_gid = opt.gid;
816 0 : sbi->s_uid_set = opt.uid_set;
817 0 : sbi->s_gid_set = opt.gid_set;
818 0 : sbi->s_utf8 = opt.utf8;
819 0 : sbi->s_nocompress = opt.nocompress;
820 0 : sbi->s_overriderockperm = opt.overriderockperm;
821 : /*
822 : * It would be incredibly stupid to allow people to mark every file
823 : * on the disk as suid, so we merely allow them to set the default
824 : * permissions.
825 : */
826 0 : if (opt.fmode != ISOFS_INVALID_MODE)
827 0 : sbi->s_fmode = opt.fmode & 0777;
828 : else
829 0 : sbi->s_fmode = ISOFS_INVALID_MODE;
830 0 : if (opt.dmode != ISOFS_INVALID_MODE)
831 0 : sbi->s_dmode = opt.dmode & 0777;
832 : else
833 0 : sbi->s_dmode = ISOFS_INVALID_MODE;
834 :
835 : /*
836 : * Read the root inode, which _may_ result in changing
837 : * the s_rock flag. Once we have the final s_rock value,
838 : * we then decide whether to use the Joliet descriptor.
839 : */
840 0 : inode = isofs_iget(s, sbi->s_firstdatazone, 0);
841 0 : if (IS_ERR(inode))
842 0 : goto out_no_root;
843 :
844 : /*
845 : * If this disk has both Rock Ridge and Joliet on it, then we
846 : * want to use Rock Ridge by default. This can be overridden
847 : * by using the norock mount option. There is still one other
848 : * possibility that is not taken into account: a Rock Ridge
849 : * CD with Unicode names. Until someone sees such a beast, it
850 : * will not be supported.
851 : */
852 0 : if (sbi->s_rock == 1) {
853 0 : joliet_level = 0;
854 0 : } else if (joliet_level) {
855 0 : sbi->s_rock = 0;
856 0 : if (sbi->s_firstdatazone != first_data_zone) {
857 0 : sbi->s_firstdatazone = first_data_zone;
858 0 : printk(KERN_DEBUG
859 : "ISOFS: changing to secondary root\n");
860 0 : iput(inode);
861 0 : inode = isofs_iget(s, sbi->s_firstdatazone, 0);
862 0 : if (IS_ERR(inode))
863 0 : goto out_no_root;
864 : }
865 : }
866 :
867 0 : if (opt.check == 'u') {
868 : /* Only Joliet is case insensitive by default */
869 0 : if (joliet_level)
870 0 : opt.check = 'r';
871 : else
872 0 : opt.check = 's';
873 : }
874 0 : sbi->s_joliet_level = joliet_level;
875 :
876 : /* Make sure the root inode is a directory */
877 0 : if (!S_ISDIR(inode->i_mode)) {
878 0 : printk(KERN_WARNING
879 : "isofs_fill_super: root inode is not a directory. "
880 : "Corrupted media?\n");
881 0 : goto out_iput;
882 : }
883 :
884 : /* get the root dentry */
885 0 : s->s_root = d_alloc_root(inode);
886 0 : if (!(s->s_root))
887 0 : goto out_no_root;
888 :
889 0 : table = 0;
890 0 : if (joliet_level)
891 0 : table += 2;
892 0 : if (opt.check == 'r')
893 0 : table++;
894 0 : s->s_root->d_op = &isofs_dentry_ops[table];
895 :
896 0 : kfree(opt.iocharset);
897 :
898 0 : return 0;
899 0 :
900 : /*
901 : * Display error messages and free resources.
902 : */
903 : out_iput:
904 0 : iput(inode);
905 0 : goto out_no_inode;
906 0 : out_no_root:
907 0 : error = PTR_ERR(inode);
908 0 : if (error != -ENOMEM)
909 0 : printk(KERN_WARNING "%s: get root inode failed\n", __func__);
910 : out_no_inode:
911 : #ifdef CONFIG_JOLIET
912 0 : unload_nls(sbi->s_nls_iocharset);
913 : #endif
914 0 : goto out_freesbi;
915 0 : out_no_read:
916 0 : printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
917 : __func__, s->s_id, iso_blknum, block);
918 0 : goto out_freesbi;
919 0 : out_bad_zone_size:
920 0 : printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
921 : sbi->s_log_zone_size);
922 0 : goto out_freebh;
923 0 : out_bad_size:
924 0 : printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
925 : orig_zonesize, opt.blocksize);
926 0 : goto out_freebh;
927 0 : out_unknown_format:
928 0 : if (!silent)
929 0 : printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
930 :
931 : out_freebh:
932 0 : brelse(bh);
933 : out_freesbi:
934 0 : kfree(opt.iocharset);
935 0 : kfree(sbi);
936 0 : s->s_fs_info = NULL;
937 0 : return error;
938 : }
939 :
940 : static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
941 : {
942 2 : struct super_block *sb = dentry->d_sb;
943 4 : u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
944 1 :
945 2 : buf->f_type = ISOFS_SUPER_MAGIC;
946 3 : buf->f_bsize = sb->s_blocksize;
947 8 : buf->f_blocks = (ISOFS_SB(sb)->s_nzones
948 : << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
949 1 : buf->f_bfree = 0;
950 1 : buf->f_bavail = 0;
951 4 : buf->f_files = ISOFS_SB(sb)->s_ninodes;
952 1 : buf->f_ffree = 0;
953 1 : buf->f_fsid.val[0] = (u32)id;
954 1 : buf->f_fsid.val[1] = (u32)(id >> 32);
955 1 : buf->f_namelen = NAME_MAX;
956 1 : return 0;
957 : }
958 :
959 : /*
960 : * Get a set of blocks; filling in buffer_heads if already allocated
961 : * or getblk() if they are not. Returns the number of blocks inserted
962 : * (-ve == error.)
963 : */
964 : int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
965 : struct buffer_head **bh, unsigned long nblocks)
966 : {
967 4 : unsigned long b_off;
968 4 : unsigned offset, sect_size;
969 4 : unsigned int firstext;
970 4 : unsigned long nextblk, nextoff;
971 8 : long iblock = (long)iblock_s;
972 4 : int section, rv, error;
973 16 : struct iso_inode_info *ei = ISOFS_I(inode);
974 4 :
975 8 : lock_kernel();
976 4 :
977 8 : error = -EIO;
978 8 : rv = 0;
979 20 : if (iblock < 0 || iblock != iblock_s) {
980 8 : printk(KERN_DEBUG "%s: block number too large\n", __func__);
981 8 : goto abort;
982 4 : }
983 4 :
984 8 : b_off = iblock;
985 4 :
986 4 : offset = 0;
987 4 : firstext = ei->i_first_extent;
988 8 : sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
989 4 : nextblk = ei->i_next_section_block;
990 4 : nextoff = ei->i_next_section_offset;
991 4 : section = 0;
992 :
993 12 : while (nblocks) {
994 4 : /* If we are *way* beyond the end of the file, print a message.
995 4 : * Access beyond the end of the file up to the next page boundary
996 : * is normal, however because of the way the page cache works.
997 : * In this case, we just return 0 so that we can properly fill
998 : * the page with useless information without generating any
999 : * I/O errors.
1000 : */
1001 16 : if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1002 8 : printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
1003 : __func__, iblock, (unsigned long) inode->i_size);
1004 4 : goto abort;
1005 : }
1006 :
1007 : /* On the last section, nextblk == 0, section size is likely to
1008 : * exceed sect_size by a partial block, and access beyond the
1009 : * end of the file will reach beyond the section size, too.
1010 : */
1011 20 : while (nextblk && (b_off >= (offset + sect_size))) {
1012 4 : struct inode *ninode;
1013 4 :
1014 4 : offset += sect_size;
1015 24 : ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1016 16 : if (IS_ERR(ninode)) {
1017 12 : error = PTR_ERR(ninode);
1018 4 : goto abort;
1019 : }
1020 12 : firstext = ISOFS_I(ninode)->i_first_extent;
1021 16 : sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1022 12 : nextblk = ISOFS_I(ninode)->i_next_section_block;
1023 12 : nextoff = ISOFS_I(ninode)->i_next_section_offset;
1024 4 : iput(ninode);
1025 :
1026 12 : if (++section > 100) {
1027 4 : printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1028 : " aborting...\n", __func__);
1029 4 : printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1030 : "nextblk=%lu nextoff=%lu\n", __func__,
1031 : iblock, firstext, (unsigned) sect_size,
1032 : nextblk, nextoff);
1033 4 : goto abort;
1034 : }
1035 : }
1036 :
1037 12 : if (*bh) {
1038 8 : map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1039 : } else {
1040 8 : *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1041 8 : if (!*bh)
1042 4 : goto abort;
1043 : }
1044 8 : bh++; /* Next buffer head */
1045 8 : b_off++; /* Next buffer offset */
1046 8 : nblocks--;
1047 8 : rv++;
1048 8 : }
1049 :
1050 4 : error = 0;
1051 4 : abort:
1052 20 : unlock_kernel();
1053 120 : return rv != 0 ? rv : error;
1054 : }
1055 :
1056 : /*
1057 : * Used by the standard interfaces.
1058 : */
1059 : static int isofs_get_block(struct inode *inode, sector_t iblock,
1060 : struct buffer_head *bh_result, int create)
1061 : {
1062 4 : int ret;
1063 :
1064 8 : if (create) {
1065 4 : printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1066 4 : return -EROFS;
1067 : }
1068 :
1069 24 : ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1070 24 : return ret < 0 ? ret : 0;
1071 : }
1072 :
1073 : static int isofs_bmap(struct inode *inode, sector_t block)
1074 : {
1075 4 : struct buffer_head dummy;
1076 4 : int error;
1077 :
1078 4 : dummy.b_state = 0;
1079 4 : dummy.b_blocknr = -1000;
1080 12 : error = isofs_get_block(inode, block, &dummy, 0);
1081 8 : if (!error)
1082 4 : return dummy.b_blocknr;
1083 4 : return 0;
1084 : }
1085 :
1086 : struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1087 : {
1088 16 : sector_t blknr = isofs_bmap(inode, block);
1089 12 : if (!blknr)
1090 8 : return NULL;
1091 12 : return sb_bread(inode->i_sb, blknr);
1092 : }
1093 :
1094 : static int isofs_readpage(struct file *file, struct page *page)
1095 : {
1096 0 : return block_read_full_page(page,isofs_get_block);
1097 : }
1098 :
1099 : static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1100 : {
1101 3 : return generic_block_bmap(mapping,block,isofs_get_block);
1102 : }
1103 :
1104 1 : static const struct address_space_operations isofs_aops = {
1105 : .readpage = isofs_readpage,
1106 : .sync_page = block_sync_page,
1107 : .bmap = _isofs_bmap
1108 : };
1109 :
1110 : static int isofs_read_level3_size(struct inode *inode)
1111 : {
1112 16 : unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1113 40 : int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1114 16 : struct buffer_head *bh = NULL;
1115 8 : unsigned long block, offset, block_saved, offset_saved;
1116 16 : int i = 0;
1117 16 : int more_entries = 0;
1118 16 : struct iso_directory_record *tmpde = NULL;
1119 32 : struct iso_inode_info *ei = ISOFS_I(inode);
1120 8 :
1121 16 : inode->i_size = 0;
1122 8 :
1123 8 : /* The first 16 blocks are reserved as the System Area. Thus,
1124 8 : * no inodes can appear in block 0. We use this to flag that
1125 8 : * this is the last section. */
1126 16 : ei->i_next_section_block = 0;
1127 16 : ei->i_next_section_offset = 0;
1128 8 :
1129 16 : block = ei->i_iget5_block;
1130 8 : offset = ei->i_iget5_offset;
1131 :
1132 8 : do {
1133 : struct iso_directory_record *de;
1134 : unsigned int de_len;
1135 :
1136 16 : if (!bh) {
1137 16 : bh = sb_bread(inode->i_sb, block);
1138 16 : if (!bh)
1139 8 : goto out_noread;
1140 : }
1141 16 : de = (struct iso_directory_record *) (bh->b_data + offset);
1142 16 : de_len = *(unsigned char *) de;
1143 :
1144 32 : if (de_len == 0) {
1145 32 : brelse(bh);
1146 8 : bh = NULL;
1147 8 : ++block;
1148 8 : offset = 0;
1149 8 : continue;
1150 : }
1151 :
1152 16 : block_saved = block;
1153 16 : offset_saved = offset;
1154 16 : offset += de_len;
1155 :
1156 : /* Make sure we have a full directory entry */
1157 32 : if (offset >= bufsize) {
1158 16 : int slop = bufsize - offset + de_len;
1159 32 : if (!tmpde) {
1160 40 : tmpde = kmalloc(256, GFP_KERNEL);
1161 16 : if (!tmpde)
1162 8 : goto out_nomem;
1163 : }
1164 24 : memcpy(tmpde, de, slop);
1165 24 : offset &= bufsize - 1;
1166 24 : block++;
1167 48 : brelse(bh);
1168 8 : bh = NULL;
1169 16 : if (offset) {
1170 16 : bh = sb_bread(inode->i_sb, block);
1171 16 : if (!bh)
1172 8 : goto out_noread;
1173 16 : memcpy((void *)tmpde+slop, bh->b_data, offset);
1174 : }
1175 16 : de = tmpde;
1176 : }
1177 :
1178 72 : inode->i_size += isonum_733(de->size);
1179 16 : if (i == 1) {
1180 8 : ei->i_next_section_block = block_saved;
1181 8 : ei->i_next_section_offset = offset_saved;
1182 : }
1183 :
1184 8 : more_entries = de->flags[-high_sierra] & 0x80;
1185 :
1186 8 : i++;
1187 16 : if (i > 100)
1188 8 : goto out_toomany;
1189 32 : } while (more_entries);
1190 : out:
1191 32 : kfree(tmpde);
1192 40 : if (bh)
1193 32 : brelse(bh);
1194 24 : return 0;
1195 8 :
1196 16 : out_nomem:
1197 16 : if (bh)
1198 16 : brelse(bh);
1199 16 : return -ENOMEM;
1200 16 :
1201 : out_noread:
1202 16 : printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1203 16 : kfree(tmpde);
1204 16 : return -EIO;
1205 8 :
1206 : out_toomany:
1207 8 : printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1208 : "isofs_read_level3_size: inode=%lu\n",
1209 : __func__, inode->i_ino);
1210 8 : goto out;
1211 : }
1212 :
1213 : static int isofs_read_inode(struct inode *inode)
1214 : {
1215 16 : struct super_block *sb = inode->i_sb;
1216 32 : struct isofs_sb_info *sbi = ISOFS_SB(sb);
1217 16 : unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1218 8 : unsigned long block;
1219 24 : int high_sierra = sbi->s_high_sierra;
1220 16 : struct buffer_head *bh = NULL;
1221 8 : struct iso_directory_record *de;
1222 16 : struct iso_directory_record *tmpde = NULL;
1223 8 : unsigned int de_len;
1224 8 : unsigned long offset;
1225 32 : struct iso_inode_info *ei = ISOFS_I(inode);
1226 16 : int ret = -EIO;
1227 8 :
1228 16 : block = ei->i_iget5_block;
1229 24 : bh = sb_bread(inode->i_sb, block);
1230 24 : if (!bh)
1231 16 : goto out_badread;
1232 8 :
1233 16 : offset = ei->i_iget5_offset;
1234 8 :
1235 16 : de = (struct iso_directory_record *) (bh->b_data + offset);
1236 16 : de_len = *(unsigned char *) de;
1237 8 :
1238 24 : if (offset + de_len > bufsize) {
1239 16 : int frag1 = bufsize - offset;
1240 :
1241 24 : tmpde = kmalloc(de_len, GFP_KERNEL);
1242 16 : if (tmpde == NULL) {
1243 8 : printk(KERN_INFO "%s: out of memory\n", __func__);
1244 8 : ret = -ENOMEM;
1245 8 : goto fail;
1246 : }
1247 8 : memcpy(tmpde, bh->b_data + offset, frag1);
1248 16 : brelse(bh);
1249 24 : bh = sb_bread(inode->i_sb, ++block);
1250 16 : if (!bh)
1251 8 : goto out_badread;
1252 16 : memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1253 8 : de = tmpde;
1254 : }
1255 :
1256 48 : inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1257 : ei->i_iget5_offset,
1258 : ISOFS_BUFFER_BITS(inode));
1259 :
1260 : /* Assume it is a normal-format file unless told otherwise */
1261 8 : ei->i_file_format = isofs_file_normal;
1262 :
1263 16 : if (de->flags[-high_sierra] & 2) {
1264 16 : if (sbi->s_dmode != ISOFS_INVALID_MODE)
1265 16 : inode->i_mode = S_IFDIR | sbi->s_dmode;
1266 : else
1267 8 : inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1268 8 : inode->i_nlink = 1; /*
1269 : * Set to 1. We know there are 2, but
1270 : * the find utility tries to optimize
1271 : * if it is 2, and it screws up. It is
1272 : * easier to give 1 which tells find to
1273 : * do it the hard way.
1274 : */
1275 : } else {
1276 16 : if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1277 16 : inode->i_mode = S_IFREG | sbi->s_fmode;
1278 : } else {
1279 : /*
1280 : * Set default permissions: r-x for all. The disc
1281 : * could be shared with DOS machines so virtually
1282 : * anything could be a valid executable.
1283 : */
1284 8 : inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1285 : }
1286 8 : inode->i_nlink = 1;
1287 : }
1288 8 : inode->i_uid = sbi->s_uid;
1289 8 : inode->i_gid = sbi->s_gid;
1290 8 : inode->i_blocks = 0;
1291 :
1292 8 : ei->i_format_parm[0] = 0;
1293 8 : ei->i_format_parm[1] = 0;
1294 8 : ei->i_format_parm[2] = 0;
1295 :
1296 24 : ei->i_section_size = isonum_733(de->size);
1297 16 : if (de->flags[-high_sierra] & 0x80) {
1298 64 : ret = isofs_read_level3_size(inode);
1299 16 : if (ret < 0)
1300 8 : goto fail;
1301 8 : ret = -EIO;
1302 : } else {
1303 8 : ei->i_next_section_block = 0;
1304 8 : ei->i_next_section_offset = 0;
1305 24 : inode->i_size = isonum_733(de->size);
1306 : }
1307 :
1308 : /*
1309 : * Some dipshit decided to store some other bit of information
1310 : * in the high byte of the file length. Truncate size in case
1311 : * this CDROM was mounted with the cruft option.
1312 : */
1313 :
1314 32 : if (sbi->s_cruft)
1315 16 : inode->i_size &= 0x00ffffff;
1316 :
1317 32 : if (de->interleave[0]) {
1318 16 : printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1319 16 : inode->i_size = 0;
1320 : }
1321 :
1322 : /* I have no idea what file_unit_size is used for, so
1323 : we will flag it for now */
1324 32 : if (de->file_unit_size[0] != 0) {
1325 16 : printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1326 : inode->i_ino);
1327 : }
1328 :
1329 : /* I have no idea what other flag bits are used for, so
1330 : we will flag it for now */
1331 : #ifdef DEBUG
1332 : if((de->flags[-high_sierra] & ~2)!= 0){
1333 : printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1334 : "(%ld %x).\n",
1335 : inode->i_ino, de->flags[-high_sierra]);
1336 : }
1337 : #endif
1338 :
1339 88 : inode->i_mtime.tv_sec =
1340 : inode->i_atime.tv_sec =
1341 : inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1342 40 : inode->i_mtime.tv_nsec =
1343 : inode->i_atime.tv_nsec =
1344 : inode->i_ctime.tv_nsec = 0;
1345 :
1346 40 : ei->i_first_extent = (isonum_733(de->extent) +
1347 : isonum_711(de->ext_attr_length));
1348 :
1349 : /* Set the number of blocks for stat() - should be done before RR */
1350 8 : inode->i_blocks = (inode->i_size + 511) >> 9;
1351 :
1352 : /*
1353 : * Now test for possible Rock Ridge extensions which will override
1354 : * some of these numbers in the inode structure.
1355 : */
1356 :
1357 16 : if (!high_sierra) {
1358 32 : parse_rock_ridge_inode(de, inode);
1359 : /* if we want uid/gid set, override the rock ridge setting */
1360 16 : if (sbi->s_uid_set)
1361 8 : inode->i_uid = sbi->s_uid;
1362 16 : if (sbi->s_gid_set)
1363 8 : inode->i_gid = sbi->s_gid;
1364 : }
1365 : /* Now set final access rights if overriding rock ridge setting */
1366 112 : if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1367 : sbi->s_dmode != ISOFS_INVALID_MODE)
1368 32 : inode->i_mode = S_IFDIR | sbi->s_dmode;
1369 112 : if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1370 : sbi->s_fmode != ISOFS_INVALID_MODE)
1371 32 : inode->i_mode = S_IFREG | sbi->s_fmode;
1372 :
1373 : /* Install the inode operations vector */
1374 48 : if (S_ISREG(inode->i_mode)) {
1375 16 : inode->i_fop = &generic_ro_fops;
1376 : switch (ei->i_file_format) {
1377 : #ifdef CONFIG_ZISOFS
1378 : case isofs_file_compressed:
1379 : inode->i_data.a_ops = &zisofs_aops;
1380 : break;
1381 : #endif
1382 16 : default:
1383 32 : inode->i_data.a_ops = &isofs_aops;
1384 16 : break;
1385 : }
1386 48 : } else if (S_ISDIR(inode->i_mode)) {
1387 16 : inode->i_op = &isofs_dir_inode_operations;
1388 16 : inode->i_fop = &isofs_dir_operations;
1389 48 : } else if (S_ISLNK(inode->i_mode)) {
1390 16 : inode->i_op = &page_symlink_inode_operations;
1391 16 : inode->i_data.a_ops = &isofs_symlink_aops;
1392 : } else
1393 : /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1394 32 : init_special_inode(inode, inode->i_mode, inode->i_rdev);
1395 :
1396 16 : ret = 0;
1397 16 : out:
1398 48 : kfree(tmpde);
1399 96 : if (bh)
1400 96 : brelse(bh);
1401 56 : return ret;
1402 16 :
1403 : out_badread:
1404 16 : printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1405 : fail:
1406 48 : goto out;
1407 : }
1408 1 :
1409 : struct isofs_iget5_callback_data {
1410 : unsigned long block;
1411 : unsigned long offset;
1412 : };
1413 :
1414 : static int isofs_iget5_test(struct inode *ino, void *data)
1415 : {
1416 0 : struct iso_inode_info *i = ISOFS_I(ino);
1417 0 : struct isofs_iget5_callback_data *d =
1418 0 : (struct isofs_iget5_callback_data*)data;
1419 0 : return (i->i_iget5_block == d->block)
1420 : && (i->i_iget5_offset == d->offset);
1421 : }
1422 :
1423 : static int isofs_iget5_set(struct inode *ino, void *data)
1424 : {
1425 0 : struct iso_inode_info *i = ISOFS_I(ino);
1426 0 : struct isofs_iget5_callback_data *d =
1427 0 : (struct isofs_iget5_callback_data*)data;
1428 0 : i->i_iget5_block = d->block;
1429 0 : i->i_iget5_offset = d->offset;
1430 0 : return 0;
1431 : }
1432 :
1433 : /* Store, in the inode's containing structure, the block and block
1434 : * offset that point to the underlying meta-data for the inode. The
1435 : * code below is otherwise similar to the iget() code in
1436 : * include/linux/fs.h */
1437 : struct inode *isofs_iget(struct super_block *sb,
1438 : unsigned long block,
1439 8 : unsigned long offset)
1440 8 : {
1441 8 : unsigned long hashval;
1442 8 : struct inode *inode;
1443 8 : struct isofs_iget5_callback_data data;
1444 8 : long ret;
1445 8 :
1446 32 : if (offset >= 1ul << sb->s_blocksize_bits)
1447 24 : return ERR_PTR(-EINVAL);
1448 :
1449 8 : data.block = block;
1450 8 : data.offset = offset;
1451 :
1452 16 : hashval = (block << sb->s_blocksize_bits) | offset;
1453 :
1454 8 : inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1455 : &isofs_iget5_set, &data);
1456 :
1457 16 : if (!inode)
1458 24 : return ERR_PTR(-ENOMEM);
1459 :
1460 16 : if (inode->i_state & I_NEW) {
1461 72 : ret = isofs_read_inode(inode);
1462 16 : if (ret < 0) {
1463 8 : iget_failed(inode);
1464 24 : inode = ERR_PTR(ret);
1465 : } else {
1466 8 : unlock_new_inode(inode);
1467 : }
1468 : }
1469 :
1470 24 : return inode;
1471 : }
1472 :
1473 : static int isofs_get_sb(struct file_system_type *fs_type,
1474 : int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1475 : {
1476 3 : return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1477 : mnt);
1478 : }
1479 :
1480 1 : static struct file_system_type iso9660_fs_type = {
1481 : .owner = THIS_MODULE,
1482 : .name = "iso9660",
1483 : .get_sb = isofs_get_sb,
1484 : .kill_sb = kill_block_super,
1485 : .fs_flags = FS_REQUIRES_DEV,
1486 : };
1487 :
1488 : static int __init init_iso9660_fs(void)
1489 : {
1490 4 : int err = init_inodecache();
1491 3 : if (err)
1492 1 : goto out;
1493 : #ifdef CONFIG_ZISOFS
1494 : err = zisofs_init();
1495 : if (err)
1496 : goto out1;
1497 : #endif
1498 2 : err = register_filesystem(&iso9660_fs_type);
1499 2 : if (err)
1500 1 : goto out2;
1501 1 : return 0;
1502 1 : out2:
1503 : #ifdef CONFIG_ZISOFS
1504 : zisofs_cleanup();
1505 : out1:
1506 : #endif
1507 2 : destroy_inodecache();
1508 : out:
1509 3 : return err;
1510 : }
1511 :
1512 : static void __exit exit_iso9660_fs(void)
1513 : {
1514 4 : unregister_filesystem(&iso9660_fs_type);
1515 : #ifdef CONFIG_ZISOFS
1516 : zisofs_cleanup();
1517 : #endif
1518 4 : destroy_inodecache();
1519 2 : }
1520 :
1521 : module_init(init_iso9660_fs)
1522 : module_exit(exit_iso9660_fs)
1523 1 : MODULE_LICENSE("GPL");
1524 : /* Actual filesystem name is iso9660, as requested in filesystems.c */
1525 : MODULE_ALIAS("iso9660");
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