1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/isofs/inode.c
4 *
5 * (C) 1991 Linus Torvalds - minix filesystem
6 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
7 * 1994 Eberhard Mönkeberg - multi session handling.
8 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
9 * 1997 Gordon Chaffee - Joliet CDs
10 * 1998 Eric Lammerts - ISO 9660 Level 3
11 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
12 * 2004 Paul Serice - NFS Export Operations
13 */
14
15 #include <linux/init.h>
16 #include <linux/module.h>
17
18 #include <linux/slab.h>
19 #include <linux/cred.h>
20 #include <linux/nls.h>
21 #include <linux/ctype.h>
22 #include <linux/statfs.h>
23 #include <linux/cdrom.h>
24 #include <linux/mpage.h>
25 #include <linux/user_namespace.h>
26 #include <linux/seq_file.h>
27 #include <linux/blkdev.h>
28 #include <linux/fs_context.h>
29 #include <linux/fs_parser.h>
30
31 #include "isofs.h"
32 #include "zisofs.h"
33
34 /* max tz offset is 13 hours */
35 #define MAX_TZ_OFFSET (52*15*60)
36
37 #define BEQUIET
38
39 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
40 static int isofs_dentry_cmpi(const struct dentry *dentry,
41 unsigned int len, const char *str, const struct qstr *name);
42
43 #ifdef CONFIG_JOLIET
44 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
45 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
46 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
47 unsigned int len, const char *str, const struct qstr *name);
48 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
49 unsigned int len, const char *str, const struct qstr *name);
50 #endif
51
isofs_put_super(struct super_block * sb)52 static void isofs_put_super(struct super_block *sb)
53 {
54 struct isofs_sb_info *sbi = ISOFS_SB(sb);
55
56 #ifdef CONFIG_JOLIET
57 unload_nls(sbi->s_nls_iocharset);
58 #endif
59
60 kfree(sbi);
61 sb->s_fs_info = NULL;
62 return;
63 }
64
65 static int isofs_read_inode(struct inode *, int relocated);
66 static int isofs_statfs (struct dentry *, struct kstatfs *);
67 static int isofs_show_options(struct seq_file *, struct dentry *);
68
69 static struct kmem_cache *isofs_inode_cachep;
70
isofs_alloc_inode(struct super_block * sb)71 static struct inode *isofs_alloc_inode(struct super_block *sb)
72 {
73 struct iso_inode_info *ei;
74 ei = alloc_inode_sb(sb, isofs_inode_cachep, GFP_KERNEL);
75 if (!ei)
76 return NULL;
77 return &ei->vfs_inode;
78 }
79
isofs_free_inode(struct inode * inode)80 static void isofs_free_inode(struct inode *inode)
81 {
82 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
83 }
84
init_once(void * foo)85 static void init_once(void *foo)
86 {
87 struct iso_inode_info *ei = foo;
88
89 inode_init_once(&ei->vfs_inode);
90 }
91
init_inodecache(void)92 static int __init init_inodecache(void)
93 {
94 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
95 sizeof(struct iso_inode_info),
96 0, (SLAB_RECLAIM_ACCOUNT|
97 SLAB_ACCOUNT),
98 init_once);
99 if (!isofs_inode_cachep)
100 return -ENOMEM;
101 return 0;
102 }
103
destroy_inodecache(void)104 static void destroy_inodecache(void)
105 {
106 /*
107 * Make sure all delayed rcu free inodes are flushed before we
108 * destroy cache.
109 */
110 rcu_barrier();
111 kmem_cache_destroy(isofs_inode_cachep);
112 }
113
isofs_reconfigure(struct fs_context * fc)114 static int isofs_reconfigure(struct fs_context *fc)
115 {
116 sync_filesystem(fc->root->d_sb);
117 if (!(fc->sb_flags & SB_RDONLY))
118 return -EROFS;
119 return 0;
120 }
121
122 static const struct super_operations isofs_sops = {
123 .alloc_inode = isofs_alloc_inode,
124 .free_inode = isofs_free_inode,
125 .put_super = isofs_put_super,
126 .statfs = isofs_statfs,
127 .show_options = isofs_show_options,
128 };
129
130
131 static const struct dentry_operations isofs_dentry_ops[] = {
132 {
133 .d_hash = isofs_hashi,
134 .d_compare = isofs_dentry_cmpi,
135 },
136 #ifdef CONFIG_JOLIET
137 {
138 .d_hash = isofs_hash_ms,
139 .d_compare = isofs_dentry_cmp_ms,
140 },
141 {
142 .d_hash = isofs_hashi_ms,
143 .d_compare = isofs_dentry_cmpi_ms,
144 },
145 #endif
146 };
147
148 struct isofs_options{
149 unsigned int rock:1;
150 unsigned int joliet:1;
151 unsigned int cruft:1;
152 unsigned int hide:1;
153 unsigned int showassoc:1;
154 unsigned int nocompress:1;
155 unsigned int overriderockperm:1;
156 unsigned int uid_set:1;
157 unsigned int gid_set:1;
158 unsigned char map;
159 unsigned char check;
160 unsigned int blocksize;
161 umode_t fmode;
162 umode_t dmode;
163 kgid_t gid;
164 kuid_t uid;
165 char *iocharset;
166 /* LVE */
167 s32 session;
168 s32 sbsector;
169 };
170
171 /*
172 * Compute the hash for the isofs name corresponding to the dentry.
173 */
174 static int
isofs_hashi_common(const struct dentry * dentry,struct qstr * qstr,int ms)175 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
176 {
177 const char *name;
178 int len;
179 char c;
180 unsigned long hash;
181
182 len = qstr->len;
183 name = qstr->name;
184 if (ms) {
185 while (len && name[len-1] == '.')
186 len--;
187 }
188
189 hash = init_name_hash(dentry);
190 while (len--) {
191 c = tolower(*name++);
192 hash = partial_name_hash(c, hash);
193 }
194 qstr->hash = end_name_hash(hash);
195
196 return 0;
197 }
198
199 /*
200 * Compare of two isofs names.
201 */
isofs_dentry_cmp_common(unsigned int len,const char * str,const struct qstr * name,int ms,int ci)202 static int isofs_dentry_cmp_common(
203 unsigned int len, const char *str,
204 const struct qstr *name, int ms, int ci)
205 {
206 int alen, blen;
207
208 /* A filename cannot end in '.' or we treat it like it has none */
209 alen = name->len;
210 blen = len;
211 if (ms) {
212 while (alen && name->name[alen-1] == '.')
213 alen--;
214 while (blen && str[blen-1] == '.')
215 blen--;
216 }
217 if (alen == blen) {
218 if (ci) {
219 if (strncasecmp(name->name, str, alen) == 0)
220 return 0;
221 } else {
222 if (strncmp(name->name, str, alen) == 0)
223 return 0;
224 }
225 }
226 return 1;
227 }
228
229 static int
isofs_hashi(const struct dentry * dentry,struct qstr * qstr)230 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
231 {
232 return isofs_hashi_common(dentry, qstr, 0);
233 }
234
235 static int
isofs_dentry_cmpi(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)236 isofs_dentry_cmpi(const struct dentry *dentry,
237 unsigned int len, const char *str, const struct qstr *name)
238 {
239 return isofs_dentry_cmp_common(len, str, name, 0, 1);
240 }
241
242 #ifdef CONFIG_JOLIET
243 /*
244 * Compute the hash for the isofs name corresponding to the dentry.
245 */
246 static int
isofs_hash_common(const struct dentry * dentry,struct qstr * qstr,int ms)247 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
248 {
249 const char *name;
250 int len;
251
252 len = qstr->len;
253 name = qstr->name;
254 if (ms) {
255 while (len && name[len-1] == '.')
256 len--;
257 }
258
259 qstr->hash = full_name_hash(dentry, name, len);
260
261 return 0;
262 }
263
264 static int
isofs_hash_ms(const struct dentry * dentry,struct qstr * qstr)265 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
266 {
267 return isofs_hash_common(dentry, qstr, 1);
268 }
269
270 static int
isofs_hashi_ms(const struct dentry * dentry,struct qstr * qstr)271 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
272 {
273 return isofs_hashi_common(dentry, qstr, 1);
274 }
275
276 static int
isofs_dentry_cmp_ms(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)277 isofs_dentry_cmp_ms(const struct dentry *dentry,
278 unsigned int len, const char *str, const struct qstr *name)
279 {
280 return isofs_dentry_cmp_common(len, str, name, 1, 0);
281 }
282
283 static int
isofs_dentry_cmpi_ms(const struct dentry * dentry,unsigned int len,const char * str,const struct qstr * name)284 isofs_dentry_cmpi_ms(const struct dentry *dentry,
285 unsigned int len, const char *str, const struct qstr *name)
286 {
287 return isofs_dentry_cmp_common(len, str, name, 1, 1);
288 }
289 #endif
290
291 enum {
292 Opt_block, Opt_check, Opt_cruft, Opt_gid, Opt_ignore, Opt_iocharset,
293 Opt_map, Opt_mode, Opt_nojoliet, Opt_norock, Opt_sb, Opt_session,
294 Opt_uid, Opt_unhide, Opt_utf8, Opt_err, Opt_nocompress, Opt_hide,
295 Opt_showassoc, Opt_dmode, Opt_overriderockperm,
296 };
297
298 static const struct constant_table isofs_param_map[] = {
299 {"acorn", 'a'},
300 {"a", 'a'},
301 {"normal", 'n'},
302 {"n", 'n'},
303 {"off", 'o'},
304 {"o", 'o'},
305 {}
306 };
307
308 static const struct constant_table isofs_param_check[] = {
309 {"relaxed", 'r'},
310 {"r", 'r'},
311 {"strict", 's'},
312 {"s", 's'},
313 {}
314 };
315
316 static const struct fs_parameter_spec isofs_param_spec[] = {
317 fsparam_flag ("norock", Opt_norock),
318 fsparam_flag ("nojoliet", Opt_nojoliet),
319 fsparam_flag ("unhide", Opt_unhide),
320 fsparam_flag ("hide", Opt_hide),
321 fsparam_flag ("showassoc", Opt_showassoc),
322 fsparam_flag ("cruft", Opt_cruft),
323 fsparam_flag ("utf8", Opt_utf8),
324 fsparam_string ("iocharset", Opt_iocharset),
325 fsparam_enum ("map", Opt_map, isofs_param_map),
326 fsparam_u32 ("session", Opt_session),
327 fsparam_u32 ("sbsector", Opt_sb),
328 fsparam_enum ("check", Opt_check, isofs_param_check),
329 fsparam_uid ("uid", Opt_uid),
330 fsparam_gid ("gid", Opt_gid),
331 /* Note: mode/dmode historically accepted %u not strictly %o */
332 fsparam_u32 ("mode", Opt_mode),
333 fsparam_u32 ("dmode", Opt_dmode),
334 fsparam_flag ("overriderockperm", Opt_overriderockperm),
335 fsparam_u32 ("block", Opt_block),
336 fsparam_string ("conv", Opt_ignore),
337 fsparam_flag ("nocompress", Opt_nocompress),
338 {}
339 };
340
isofs_parse_param(struct fs_context * fc,struct fs_parameter * param)341 static int isofs_parse_param(struct fs_context *fc,
342 struct fs_parameter *param)
343 {
344 struct isofs_options *popt = fc->fs_private;
345 struct fs_parse_result result;
346 int opt;
347 unsigned int n;
348
349 /* There are no remountable options */
350 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
351 return 0;
352
353 opt = fs_parse(fc, isofs_param_spec, param, &result);
354 if (opt < 0)
355 return opt;
356
357 switch (opt) {
358 case Opt_norock:
359 popt->rock = 0;
360 break;
361 case Opt_nojoliet:
362 popt->joliet = 0;
363 break;
364 case Opt_hide:
365 popt->hide = 1;
366 break;
367 case Opt_unhide:
368 case Opt_showassoc:
369 popt->showassoc = 1;
370 break;
371 case Opt_cruft:
372 popt->cruft = 1;
373 break;
374 #ifdef CONFIG_JOLIET
375 case Opt_utf8:
376 kfree(popt->iocharset);
377 popt->iocharset = kstrdup("utf8", GFP_KERNEL);
378 if (!popt->iocharset)
379 return -ENOMEM;
380 break;
381 case Opt_iocharset:
382 kfree(popt->iocharset);
383 popt->iocharset = kstrdup(param->string, GFP_KERNEL);
384 if (!popt->iocharset)
385 return -ENOMEM;
386 break;
387 #endif
388 case Opt_map:
389 popt->map = result.uint_32;
390 break;
391 case Opt_session:
392 n = result.uint_32;
393 /*
394 * Track numbers are supposed to be in range 1-99, the
395 * mount option starts indexing at 0.
396 */
397 if (n >= 99)
398 return -EINVAL;
399 popt->session = n + 1;
400 break;
401 case Opt_sb:
402 popt->sbsector = result.uint_32;
403 break;
404 case Opt_check:
405 popt->check = result.uint_32;
406 break;
407 case Opt_ignore:
408 break;
409 case Opt_uid:
410 popt->uid = result.uid;
411 popt->uid_set = 1;
412 break;
413 case Opt_gid:
414 popt->gid = result.gid;
415 popt->gid_set = 1;
416 break;
417 case Opt_mode:
418 popt->fmode = result.uint_32;
419 break;
420 case Opt_dmode:
421 popt->dmode = result.uint_32;
422 break;
423 case Opt_overriderockperm:
424 popt->overriderockperm = 1;
425 break;
426 case Opt_block:
427 n = result.uint_32;
428 if (n != 512 && n != 1024 && n != 2048)
429 return -EINVAL;
430 popt->blocksize = n;
431 break;
432 case Opt_nocompress:
433 popt->nocompress = 1;
434 break;
435 default:
436 return -EINVAL;
437 }
438 return 0;
439 }
440
441 /*
442 * Display the mount options in /proc/mounts.
443 */
isofs_show_options(struct seq_file * m,struct dentry * root)444 static int isofs_show_options(struct seq_file *m, struct dentry *root)
445 {
446 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
447
448 if (!sbi->s_rock) seq_puts(m, ",norock");
449 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
450 if (sbi->s_cruft) seq_puts(m, ",cruft");
451 if (sbi->s_hide) seq_puts(m, ",hide");
452 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
453 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
454 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
455
456 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
457 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
458 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
459 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
460
461 if (root->d_sb->s_blocksize != 1024)
462 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
463
464 if (sbi->s_uid_set)
465 seq_printf(m, ",uid=%u",
466 from_kuid_munged(&init_user_ns, sbi->s_uid));
467 if (sbi->s_gid_set)
468 seq_printf(m, ",gid=%u",
469 from_kgid_munged(&init_user_ns, sbi->s_gid));
470
471 if (sbi->s_dmode != ISOFS_INVALID_MODE)
472 seq_printf(m, ",dmode=%o", sbi->s_dmode);
473 if (sbi->s_fmode != ISOFS_INVALID_MODE)
474 seq_printf(m, ",fmode=%o", sbi->s_fmode);
475
476 #ifdef CONFIG_JOLIET
477 if (sbi->s_nls_iocharset)
478 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
479 else
480 seq_puts(m, ",iocharset=utf8");
481 #endif
482 return 0;
483 }
484
485 /*
486 * look if the driver can tell the multi session redirection value
487 *
488 * don't change this if you don't know what you do, please!
489 * Multisession is legal only with XA disks.
490 * A non-XA disk with more than one volume descriptor may do it right, but
491 * usually is written in a nowhere standardized "multi-partition" manner.
492 * Multisession uses absolute addressing (solely the first frame of the whole
493 * track is #0), multi-partition uses relative addressing (each first frame of
494 * each track is #0), and a track is not a session.
495 *
496 * A broken CDwriter software or drive firmware does not set new standards,
497 * at least not if conflicting with the existing ones.
498 *
499 * emoenke@gwdg.de
500 */
501 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
502
isofs_get_last_session(struct super_block * sb,s32 session)503 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
504 {
505 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
506 unsigned int vol_desc_start = 0;
507
508 if (session > 0) {
509 struct cdrom_tocentry te;
510
511 if (!cdi)
512 return 0;
513
514 te.cdte_track = session;
515 te.cdte_format = CDROM_LBA;
516 if (cdrom_read_tocentry(cdi, &te) == 0) {
517 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
518 session, te.cdte_addr.lba,
519 te.cdte_ctrl & CDROM_DATA_TRACK);
520 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
521 return te.cdte_addr.lba;
522 }
523
524 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
525 }
526
527 if (cdi) {
528 struct cdrom_multisession ms_info;
529
530 ms_info.addr_format = CDROM_LBA;
531 if (cdrom_multisession(cdi, &ms_info) == 0) {
532 #if WE_OBEY_THE_WRITTEN_STANDARDS
533 /* necessary for a valid ms_info.addr */
534 if (ms_info.xa_flag)
535 #endif
536 vol_desc_start = ms_info.addr.lba;
537 }
538 }
539
540 return vol_desc_start;
541 }
542
543 /*
544 * Check if root directory is empty (has less than 3 files).
545 *
546 * Used to detect broken CDs where ISO root directory is empty but Joliet root
547 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
548 * (and Joliet used instead) or else no files would be visible.
549 */
rootdir_empty(struct super_block * sb,unsigned long block)550 static bool rootdir_empty(struct super_block *sb, unsigned long block)
551 {
552 int offset = 0, files = 0, de_len;
553 struct iso_directory_record *de;
554 struct buffer_head *bh;
555
556 bh = sb_bread(sb, block);
557 if (!bh)
558 return true;
559 while (files < 3) {
560 de = (struct iso_directory_record *) (bh->b_data + offset);
561 de_len = *(unsigned char *) de;
562 if (de_len == 0)
563 break;
564 files++;
565 offset += de_len;
566 }
567 brelse(bh);
568 return files < 3;
569 }
570
571 /*
572 * Initialize the superblock and read the root inode.
573 */
isofs_fill_super(struct super_block * s,struct fs_context * fc)574 static int isofs_fill_super(struct super_block *s, struct fs_context *fc)
575 {
576 struct buffer_head *bh = NULL, *pri_bh = NULL;
577 struct hs_primary_descriptor *h_pri = NULL;
578 struct iso_primary_descriptor *pri = NULL;
579 struct iso_supplementary_descriptor *sec = NULL;
580 struct iso_directory_record *rootp;
581 struct inode *inode;
582 struct isofs_options *opt = fc->fs_private;
583 struct isofs_sb_info *sbi;
584 unsigned long first_data_zone;
585 int joliet_level = 0;
586 int iso_blknum, block;
587 int orig_zonesize;
588 int table, error = -EINVAL;
589 unsigned int vol_desc_start;
590 int silent = fc->sb_flags & SB_SILENT;
591
592 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
593 if (!sbi)
594 return -ENOMEM;
595 s->s_fs_info = sbi;
596
597 /*
598 * First of all, get the hardware blocksize for this device.
599 * If we don't know what it is, or the hardware blocksize is
600 * larger than the blocksize the user specified, then use
601 * that value.
602 */
603 /*
604 * What if bugger tells us to go beyond page size?
605 */
606 if (bdev_logical_block_size(s->s_bdev) > 2048) {
607 printk(KERN_WARNING
608 "ISOFS: unsupported/invalid hardware sector size %d\n",
609 bdev_logical_block_size(s->s_bdev));
610 goto out_freesbi;
611 }
612 opt->blocksize = sb_min_blocksize(s, opt->blocksize);
613
614 sbi->s_high_sierra = 0; /* default is iso9660 */
615 sbi->s_session = opt->session;
616 sbi->s_sbsector = opt->sbsector;
617
618 vol_desc_start = (opt->sbsector != -1) ?
619 opt->sbsector : isofs_get_last_session(s, opt->session);
620
621 for (iso_blknum = vol_desc_start+16;
622 iso_blknum < vol_desc_start+100; iso_blknum++) {
623 struct hs_volume_descriptor *hdp;
624 struct iso_volume_descriptor *vdp;
625
626 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
627 if (!(bh = sb_bread(s, block)))
628 goto out_no_read;
629
630 vdp = (struct iso_volume_descriptor *)bh->b_data;
631 hdp = (struct hs_volume_descriptor *)bh->b_data;
632
633 /*
634 * Due to the overlapping physical location of the descriptors,
635 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
636 * proper identification in this case, we first check for ISO.
637 */
638 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
639 if (isonum_711(vdp->type) == ISO_VD_END)
640 break;
641 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
642 if (!pri) {
643 pri = (struct iso_primary_descriptor *)vdp;
644 /* Save the buffer in case we need it ... */
645 pri_bh = bh;
646 bh = NULL;
647 }
648 }
649 #ifdef CONFIG_JOLIET
650 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
651 sec = (struct iso_supplementary_descriptor *)vdp;
652 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
653 if (opt->joliet) {
654 if (sec->escape[2] == 0x40)
655 joliet_level = 1;
656 else if (sec->escape[2] == 0x43)
657 joliet_level = 2;
658 else if (sec->escape[2] == 0x45)
659 joliet_level = 3;
660
661 printk(KERN_DEBUG "ISO 9660 Extensions: "
662 "Microsoft Joliet Level %d\n",
663 joliet_level);
664 }
665 goto root_found;
666 } else {
667 /* Unknown supplementary volume descriptor */
668 sec = NULL;
669 }
670 }
671 #endif
672 } else {
673 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
674 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
675 goto out_freebh;
676
677 sbi->s_high_sierra = 1;
678 opt->rock = 0;
679 h_pri = (struct hs_primary_descriptor *)vdp;
680 goto root_found;
681 }
682 }
683
684 /* Just skip any volume descriptors we don't recognize */
685
686 brelse(bh);
687 bh = NULL;
688 }
689 /*
690 * If we fall through, either no volume descriptor was found,
691 * or else we passed a primary descriptor looking for others.
692 */
693 if (!pri)
694 goto out_unknown_format;
695 brelse(bh);
696 bh = pri_bh;
697 pri_bh = NULL;
698
699 root_found:
700 /* We don't support read-write mounts */
701 if (!sb_rdonly(s)) {
702 error = -EACCES;
703 goto out_freebh;
704 }
705
706 if (joliet_level && (!pri || !opt->rock)) {
707 /* This is the case of Joliet with the norock mount flag.
708 * A disc with both Joliet and Rock Ridge is handled later
709 */
710 pri = (struct iso_primary_descriptor *) sec;
711 }
712
713 if(sbi->s_high_sierra){
714 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
715 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
716 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
717 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
718 } else {
719 if (!pri)
720 goto out_freebh;
721 rootp = (struct iso_directory_record *) pri->root_directory_record;
722 sbi->s_nzones = isonum_733(pri->volume_space_size);
723 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
724 sbi->s_max_size = isonum_733(pri->volume_space_size);
725 }
726
727 sbi->s_ninodes = 0; /* No way to figure this out easily */
728
729 orig_zonesize = sbi->s_log_zone_size;
730 /*
731 * If the zone size is smaller than the hardware sector size,
732 * this is a fatal error. This would occur if the disc drive
733 * had sectors that were 2048 bytes, but the filesystem had
734 * blocks that were 512 bytes (which should only very rarely
735 * happen.)
736 */
737 if (orig_zonesize < opt->blocksize)
738 goto out_bad_size;
739
740 /* RDE: convert log zone size to bit shift */
741 switch (sbi->s_log_zone_size) {
742 case 512: sbi->s_log_zone_size = 9; break;
743 case 1024: sbi->s_log_zone_size = 10; break;
744 case 2048: sbi->s_log_zone_size = 11; break;
745
746 default:
747 goto out_bad_zone_size;
748 }
749
750 s->s_magic = ISOFS_SUPER_MAGIC;
751
752 /*
753 * With multi-extent files, file size is only limited by the maximum
754 * size of a file system, which is 8 TB.
755 */
756 s->s_maxbytes = 0x80000000000LL;
757
758 /* ECMA-119 timestamp from 1900/1/1 with tz offset */
759 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
760 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
761
762 /* Set this for reference. Its not currently used except on write
763 which we don't have .. */
764
765 first_data_zone = isonum_733(rootp->extent) +
766 isonum_711(rootp->ext_attr_length);
767 sbi->s_firstdatazone = first_data_zone;
768 #ifndef BEQUIET
769 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
770 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
771 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
772 if(sbi->s_high_sierra)
773 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
774 #endif
775
776 /*
777 * If the Joliet level is set, we _may_ decide to use the
778 * secondary descriptor, but can't be sure until after we
779 * read the root inode. But before reading the root inode
780 * we may need to change the device blocksize, and would
781 * rather release the old buffer first. So, we cache the
782 * first_data_zone value from the secondary descriptor.
783 */
784 if (joliet_level) {
785 pri = (struct iso_primary_descriptor *) sec;
786 rootp = (struct iso_directory_record *)
787 pri->root_directory_record;
788 first_data_zone = isonum_733(rootp->extent) +
789 isonum_711(rootp->ext_attr_length);
790 }
791
792 /*
793 * We're all done using the volume descriptor, and may need
794 * to change the device blocksize, so release the buffer now.
795 */
796 brelse(pri_bh);
797 brelse(bh);
798
799 /*
800 * Force the blocksize to 512 for 512 byte sectors. The file
801 * read primitives really get it wrong in a bad way if we don't
802 * do this.
803 *
804 * Note - we should never be setting the blocksize to something
805 * less than the hardware sector size for the device. If we
806 * do, we would end up having to read larger buffers and split
807 * out portions to satisfy requests.
808 *
809 * Note2- the idea here is that we want to deal with the optimal
810 * zonesize in the filesystem. If we have it set to something less,
811 * then we have horrible problems with trying to piece together
812 * bits of adjacent blocks in order to properly read directory
813 * entries. By forcing the blocksize in this way, we ensure
814 * that we will never be required to do this.
815 */
816 sb_set_blocksize(s, orig_zonesize);
817
818 sbi->s_nls_iocharset = NULL;
819
820 #ifdef CONFIG_JOLIET
821 if (joliet_level) {
822 char *p = opt->iocharset ? opt->iocharset : CONFIG_NLS_DEFAULT;
823 if (strcmp(p, "utf8") != 0) {
824 sbi->s_nls_iocharset = opt->iocharset ?
825 load_nls(opt->iocharset) : load_nls_default();
826 if (!sbi->s_nls_iocharset)
827 goto out_freesbi;
828 }
829 }
830 #endif
831 s->s_op = &isofs_sops;
832 s->s_export_op = &isofs_export_ops;
833 sbi->s_mapping = opt->map;
834 sbi->s_rock = (opt->rock ? 2 : 0);
835 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
836 sbi->s_cruft = opt->cruft;
837 sbi->s_hide = opt->hide;
838 sbi->s_showassoc = opt->showassoc;
839 sbi->s_uid = opt->uid;
840 sbi->s_gid = opt->gid;
841 sbi->s_uid_set = opt->uid_set;
842 sbi->s_gid_set = opt->gid_set;
843 sbi->s_nocompress = opt->nocompress;
844 sbi->s_overriderockperm = opt->overriderockperm;
845 /*
846 * It would be incredibly stupid to allow people to mark every file
847 * on the disk as suid, so we merely allow them to set the default
848 * permissions.
849 */
850 if (opt->fmode != ISOFS_INVALID_MODE)
851 sbi->s_fmode = opt->fmode & 0777;
852 else
853 sbi->s_fmode = ISOFS_INVALID_MODE;
854 if (opt->dmode != ISOFS_INVALID_MODE)
855 sbi->s_dmode = opt->dmode & 0777;
856 else
857 sbi->s_dmode = ISOFS_INVALID_MODE;
858
859 /*
860 * Read the root inode, which _may_ result in changing
861 * the s_rock flag. Once we have the final s_rock value,
862 * we then decide whether to use the Joliet descriptor.
863 */
864 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
865
866 /*
867 * Fix for broken CDs with a corrupt root inode but a correct Joliet
868 * root directory.
869 */
870 if (IS_ERR(inode)) {
871 if (joliet_level && sbi->s_firstdatazone != first_data_zone) {
872 printk(KERN_NOTICE
873 "ISOFS: root inode is unusable. "
874 "Disabling Rock Ridge and switching to Joliet.");
875 sbi->s_rock = 0;
876 inode = NULL;
877 } else {
878 goto out_no_root;
879 }
880 }
881
882 /*
883 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
884 * correct Joliet root directory.
885 */
886 if (sbi->s_rock == 1 && joliet_level &&
887 rootdir_empty(s, sbi->s_firstdatazone)) {
888 printk(KERN_NOTICE
889 "ISOFS: primary root directory is empty. "
890 "Disabling Rock Ridge and switching to Joliet.");
891 sbi->s_rock = 0;
892 }
893
894 /*
895 * If this disk has both Rock Ridge and Joliet on it, then we
896 * want to use Rock Ridge by default. This can be overridden
897 * by using the norock mount option. There is still one other
898 * possibility that is not taken into account: a Rock Ridge
899 * CD with Unicode names. Until someone sees such a beast, it
900 * will not be supported.
901 */
902 if (sbi->s_rock == 1) {
903 joliet_level = 0;
904 } else if (joliet_level) {
905 sbi->s_rock = 0;
906 if (sbi->s_firstdatazone != first_data_zone) {
907 sbi->s_firstdatazone = first_data_zone;
908 printk(KERN_DEBUG
909 "ISOFS: changing to secondary root\n");
910 iput(inode);
911 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
912 if (IS_ERR(inode))
913 goto out_no_root;
914 }
915 }
916
917 if (opt->check == 'u') {
918 /* Only Joliet is case insensitive by default */
919 if (joliet_level)
920 opt->check = 'r';
921 else
922 opt->check = 's';
923 }
924 sbi->s_joliet_level = joliet_level;
925
926 /* Make sure the root inode is a directory */
927 if (!S_ISDIR(inode->i_mode)) {
928 printk(KERN_WARNING
929 "isofs_fill_super: root inode is not a directory. "
930 "Corrupted media?\n");
931 goto out_iput;
932 }
933
934 table = 0;
935 if (joliet_level)
936 table += 2;
937 if (opt->check == 'r')
938 table++;
939 sbi->s_check = opt->check;
940
941 if (table)
942 s->s_d_op = &isofs_dentry_ops[table - 1];
943
944 /* get the root dentry */
945 s->s_root = d_make_root(inode);
946 if (!(s->s_root)) {
947 error = -ENOMEM;
948 goto out_no_inode;
949 }
950
951 kfree(opt->iocharset);
952
953 return 0;
954
955 /*
956 * Display error messages and free resources.
957 */
958 out_iput:
959 iput(inode);
960 goto out_no_inode;
961 out_no_root:
962 error = PTR_ERR(inode);
963 if (error != -ENOMEM)
964 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
965 out_no_inode:
966 #ifdef CONFIG_JOLIET
967 unload_nls(sbi->s_nls_iocharset);
968 #endif
969 goto out_freesbi;
970 out_no_read:
971 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
972 __func__, s->s_id, iso_blknum, block);
973 goto out_freebh;
974 out_bad_zone_size:
975 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
976 sbi->s_log_zone_size);
977 goto out_freebh;
978 out_bad_size:
979 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
980 orig_zonesize, opt->blocksize);
981 goto out_freebh;
982 out_unknown_format:
983 if (!silent)
984 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
985
986 out_freebh:
987 brelse(bh);
988 brelse(pri_bh);
989 out_freesbi:
990 kfree(opt->iocharset);
991 kfree(sbi);
992 s->s_fs_info = NULL;
993 return error;
994 }
995
isofs_statfs(struct dentry * dentry,struct kstatfs * buf)996 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
997 {
998 struct super_block *sb = dentry->d_sb;
999 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1000
1001 buf->f_type = ISOFS_SUPER_MAGIC;
1002 buf->f_bsize = sb->s_blocksize;
1003 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1004 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1005 buf->f_bfree = 0;
1006 buf->f_bavail = 0;
1007 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1008 buf->f_ffree = 0;
1009 buf->f_fsid = u64_to_fsid(id);
1010 buf->f_namelen = NAME_MAX;
1011 return 0;
1012 }
1013
1014 /*
1015 * Get a set of blocks; filling in buffer_heads if already allocated
1016 * or getblk() if they are not. Returns the number of blocks inserted
1017 * (-ve == error.)
1018 */
isofs_get_blocks(struct inode * inode,sector_t iblock,struct buffer_head ** bh,unsigned long nblocks)1019 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1020 struct buffer_head **bh, unsigned long nblocks)
1021 {
1022 unsigned long b_off = iblock;
1023 unsigned offset, sect_size;
1024 unsigned int firstext;
1025 unsigned long nextblk, nextoff;
1026 int section, rv, error;
1027 struct iso_inode_info *ei = ISOFS_I(inode);
1028
1029 error = -EIO;
1030 rv = 0;
1031 if (iblock != b_off) {
1032 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1033 goto abort;
1034 }
1035
1036
1037 offset = 0;
1038 firstext = ei->i_first_extent;
1039 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1040 nextblk = ei->i_next_section_block;
1041 nextoff = ei->i_next_section_offset;
1042 section = 0;
1043
1044 while (nblocks) {
1045 /* If we are *way* beyond the end of the file, print a message.
1046 * Access beyond the end of the file up to the next page boundary
1047 * is normal, however because of the way the page cache works.
1048 * In this case, we just return 0 so that we can properly fill
1049 * the page with useless information without generating any
1050 * I/O errors.
1051 */
1052 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1053 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1054 __func__, b_off,
1055 (unsigned long long)inode->i_size);
1056 goto abort;
1057 }
1058
1059 /* On the last section, nextblk == 0, section size is likely to
1060 * exceed sect_size by a partial block, and access beyond the
1061 * end of the file will reach beyond the section size, too.
1062 */
1063 while (nextblk && (b_off >= (offset + sect_size))) {
1064 struct inode *ninode;
1065
1066 offset += sect_size;
1067 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1068 if (IS_ERR(ninode)) {
1069 error = PTR_ERR(ninode);
1070 goto abort;
1071 }
1072 firstext = ISOFS_I(ninode)->i_first_extent;
1073 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1074 nextblk = ISOFS_I(ninode)->i_next_section_block;
1075 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1076 iput(ninode);
1077
1078 if (++section > 100) {
1079 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1080 " aborting...\n", __func__);
1081 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1082 "nextblk=%lu nextoff=%lu\n", __func__,
1083 b_off, firstext, (unsigned) sect_size,
1084 nextblk, nextoff);
1085 goto abort;
1086 }
1087 }
1088
1089 if (*bh) {
1090 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1091 } else {
1092 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1093 if (!*bh)
1094 goto abort;
1095 }
1096 bh++; /* Next buffer head */
1097 b_off++; /* Next buffer offset */
1098 nblocks--;
1099 rv++;
1100 }
1101
1102 error = 0;
1103 abort:
1104 return rv != 0 ? rv : error;
1105 }
1106
1107 /*
1108 * Used by the standard interfaces.
1109 */
isofs_get_block(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)1110 static int isofs_get_block(struct inode *inode, sector_t iblock,
1111 struct buffer_head *bh_result, int create)
1112 {
1113 int ret;
1114
1115 if (create) {
1116 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1117 return -EROFS;
1118 }
1119
1120 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1121 return ret < 0 ? ret : 0;
1122 }
1123
isofs_bmap(struct inode * inode,sector_t block)1124 static int isofs_bmap(struct inode *inode, sector_t block)
1125 {
1126 struct buffer_head dummy;
1127 int error;
1128
1129 dummy.b_state = 0;
1130 dummy.b_blocknr = -1000;
1131 error = isofs_get_block(inode, block, &dummy, 0);
1132 if (!error)
1133 return dummy.b_blocknr;
1134 return 0;
1135 }
1136
isofs_bread(struct inode * inode,sector_t block)1137 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1138 {
1139 sector_t blknr = isofs_bmap(inode, block);
1140 if (!blknr)
1141 return NULL;
1142 return sb_bread(inode->i_sb, blknr);
1143 }
1144
isofs_read_folio(struct file * file,struct folio * folio)1145 static int isofs_read_folio(struct file *file, struct folio *folio)
1146 {
1147 return mpage_read_folio(folio, isofs_get_block);
1148 }
1149
isofs_readahead(struct readahead_control * rac)1150 static void isofs_readahead(struct readahead_control *rac)
1151 {
1152 mpage_readahead(rac, isofs_get_block);
1153 }
1154
_isofs_bmap(struct address_space * mapping,sector_t block)1155 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1156 {
1157 return generic_block_bmap(mapping,block,isofs_get_block);
1158 }
1159
1160 static const struct address_space_operations isofs_aops = {
1161 .read_folio = isofs_read_folio,
1162 .readahead = isofs_readahead,
1163 .bmap = _isofs_bmap
1164 };
1165
isofs_read_level3_size(struct inode * inode)1166 static int isofs_read_level3_size(struct inode *inode)
1167 {
1168 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1169 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1170 struct buffer_head *bh = NULL;
1171 unsigned long block, offset, block_saved, offset_saved;
1172 int i = 0;
1173 int more_entries = 0;
1174 struct iso_directory_record *tmpde = NULL;
1175 struct iso_inode_info *ei = ISOFS_I(inode);
1176
1177 inode->i_size = 0;
1178
1179 /* The first 16 blocks are reserved as the System Area. Thus,
1180 * no inodes can appear in block 0. We use this to flag that
1181 * this is the last section. */
1182 ei->i_next_section_block = 0;
1183 ei->i_next_section_offset = 0;
1184
1185 block = ei->i_iget5_block;
1186 offset = ei->i_iget5_offset;
1187
1188 do {
1189 struct iso_directory_record *de;
1190 unsigned int de_len;
1191
1192 if (!bh) {
1193 bh = sb_bread(inode->i_sb, block);
1194 if (!bh)
1195 goto out_noread;
1196 }
1197 de = (struct iso_directory_record *) (bh->b_data + offset);
1198 de_len = *(unsigned char *) de;
1199
1200 if (de_len == 0) {
1201 brelse(bh);
1202 bh = NULL;
1203 ++block;
1204 offset = 0;
1205 continue;
1206 }
1207
1208 block_saved = block;
1209 offset_saved = offset;
1210 offset += de_len;
1211
1212 /* Make sure we have a full directory entry */
1213 if (offset >= bufsize) {
1214 int slop = bufsize - offset + de_len;
1215 if (!tmpde) {
1216 tmpde = kmalloc(256, GFP_KERNEL);
1217 if (!tmpde)
1218 goto out_nomem;
1219 }
1220 memcpy(tmpde, de, slop);
1221 offset &= bufsize - 1;
1222 block++;
1223 brelse(bh);
1224 bh = NULL;
1225 if (offset) {
1226 bh = sb_bread(inode->i_sb, block);
1227 if (!bh)
1228 goto out_noread;
1229 memcpy((void *)tmpde+slop, bh->b_data, offset);
1230 }
1231 de = tmpde;
1232 }
1233
1234 inode->i_size += isonum_733(de->size);
1235 if (i == 1) {
1236 ei->i_next_section_block = block_saved;
1237 ei->i_next_section_offset = offset_saved;
1238 }
1239
1240 more_entries = de->flags[-high_sierra] & 0x80;
1241
1242 i++;
1243 if (i > 100)
1244 goto out_toomany;
1245 } while (more_entries);
1246 out:
1247 kfree(tmpde);
1248 brelse(bh);
1249 return 0;
1250
1251 out_nomem:
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
isofs_read_inode(struct inode * inode,int relocated)1267 static int isofs_read_inode(struct inode *inode, int relocated)
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;
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 if (de_len < sizeof(struct iso_directory_record))
1292 goto fail;
1293
1294 if (offset + de_len > bufsize) {
1295 int frag1 = bufsize - offset;
1296
1297 tmpde = kmalloc(de_len, GFP_KERNEL);
1298 if (!tmpde) {
1299 ret = -ENOMEM;
1300 goto fail;
1301 }
1302 memcpy(tmpde, bh->b_data + offset, frag1);
1303 brelse(bh);
1304 bh = sb_bread(inode->i_sb, ++block);
1305 if (!bh)
1306 goto out_badread;
1307 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1308 de = tmpde;
1309 }
1310
1311 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1312 ei->i_iget5_offset,
1313 ISOFS_BUFFER_BITS(inode));
1314
1315 /* Assume it is a normal-format file unless told otherwise */
1316 ei->i_file_format = isofs_file_normal;
1317
1318 if (de->flags[-high_sierra] & 2) {
1319 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1320 inode->i_mode = S_IFDIR | sbi->s_dmode;
1321 else
1322 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1323 set_nlink(inode, 1); /*
1324 * Set to 1. We know there are 2, but
1325 * the find utility tries to optimize
1326 * if it is 2, and it screws up. It is
1327 * easier to give 1 which tells find to
1328 * do it the hard way.
1329 */
1330 } else {
1331 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1332 inode->i_mode = S_IFREG | sbi->s_fmode;
1333 } else {
1334 /*
1335 * Set default permissions: r-x for all. The disc
1336 * could be shared with DOS machines so virtually
1337 * anything could be a valid executable.
1338 */
1339 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1340 }
1341 set_nlink(inode, 1);
1342 }
1343 inode->i_uid = sbi->s_uid;
1344 inode->i_gid = sbi->s_gid;
1345 inode->i_blocks = 0;
1346
1347 ei->i_format_parm[0] = 0;
1348 ei->i_format_parm[1] = 0;
1349 ei->i_format_parm[2] = 0;
1350
1351 ei->i_section_size = isonum_733(de->size);
1352 if (de->flags[-high_sierra] & 0x80) {
1353 ret = isofs_read_level3_size(inode);
1354 if (ret < 0)
1355 goto fail;
1356 ret = -EIO;
1357 } else {
1358 ei->i_next_section_block = 0;
1359 ei->i_next_section_offset = 0;
1360 inode->i_size = isonum_733(de->size);
1361 }
1362
1363 /*
1364 * Some dipshit decided to store some other bit of information
1365 * in the high byte of the file length. Truncate size in case
1366 * this CDROM was mounted with the cruft option.
1367 */
1368
1369 if (sbi->s_cruft)
1370 inode->i_size &= 0x00ffffff;
1371
1372 if (de->interleave[0]) {
1373 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1374 inode->i_size = 0;
1375 }
1376
1377 /* I have no idea what file_unit_size is used for, so
1378 we will flag it for now */
1379 if (de->file_unit_size[0] != 0) {
1380 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1381 inode->i_ino);
1382 }
1383
1384 /* I have no idea what other flag bits are used for, so
1385 we will flag it for now */
1386 #ifdef DEBUG
1387 if((de->flags[-high_sierra] & ~2)!= 0){
1388 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1389 "(%ld %x).\n",
1390 inode->i_ino, de->flags[-high_sierra]);
1391 }
1392 #endif
1393 inode_set_mtime_to_ts(inode,
1394 inode_set_atime_to_ts(inode, inode_set_ctime(inode, iso_date(de->date, high_sierra), 0)));
1395
1396 ei->i_first_extent = (isonum_733(de->extent) +
1397 isonum_711(de->ext_attr_length));
1398
1399 /* Set the number of blocks for stat() - should be done before RR */
1400 inode->i_blocks = (inode->i_size + 511) >> 9;
1401
1402 /*
1403 * Now test for possible Rock Ridge extensions which will override
1404 * some of these numbers in the inode structure.
1405 */
1406
1407 if (!high_sierra) {
1408 parse_rock_ridge_inode(de, inode, relocated);
1409 /* if we want uid/gid set, override the rock ridge setting */
1410 if (sbi->s_uid_set)
1411 inode->i_uid = sbi->s_uid;
1412 if (sbi->s_gid_set)
1413 inode->i_gid = sbi->s_gid;
1414 }
1415 /* Now set final access rights if overriding rock ridge setting */
1416 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1417 sbi->s_dmode != ISOFS_INVALID_MODE)
1418 inode->i_mode = S_IFDIR | sbi->s_dmode;
1419 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1420 sbi->s_fmode != ISOFS_INVALID_MODE)
1421 inode->i_mode = S_IFREG | sbi->s_fmode;
1422
1423 /* Install the inode operations vector */
1424 if (S_ISREG(inode->i_mode)) {
1425 inode->i_fop = &generic_ro_fops;
1426 switch (ei->i_file_format) {
1427 #ifdef CONFIG_ZISOFS
1428 case isofs_file_compressed:
1429 inode->i_data.a_ops = &zisofs_aops;
1430 break;
1431 #endif
1432 default:
1433 inode->i_data.a_ops = &isofs_aops;
1434 break;
1435 }
1436 } else if (S_ISDIR(inode->i_mode)) {
1437 inode->i_op = &isofs_dir_inode_operations;
1438 inode->i_fop = &isofs_dir_operations;
1439 } else if (S_ISLNK(inode->i_mode)) {
1440 inode->i_op = &page_symlink_inode_operations;
1441 inode_nohighmem(inode);
1442 inode->i_data.a_ops = &isofs_symlink_aops;
1443 } else
1444 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1445 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1446
1447 ret = 0;
1448 out:
1449 kfree(tmpde);
1450 brelse(bh);
1451 return ret;
1452
1453 out_badread:
1454 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1455 fail:
1456 goto out;
1457 }
1458
1459 struct isofs_iget5_callback_data {
1460 unsigned long block;
1461 unsigned long offset;
1462 };
1463
isofs_iget5_test(struct inode * ino,void * data)1464 static int isofs_iget5_test(struct inode *ino, void *data)
1465 {
1466 struct iso_inode_info *i = ISOFS_I(ino);
1467 struct isofs_iget5_callback_data *d =
1468 (struct isofs_iget5_callback_data*)data;
1469 return (i->i_iget5_block == d->block)
1470 && (i->i_iget5_offset == d->offset);
1471 }
1472
isofs_iget5_set(struct inode * ino,void * data)1473 static int isofs_iget5_set(struct inode *ino, void *data)
1474 {
1475 struct iso_inode_info *i = ISOFS_I(ino);
1476 struct isofs_iget5_callback_data *d =
1477 (struct isofs_iget5_callback_data*)data;
1478 i->i_iget5_block = d->block;
1479 i->i_iget5_offset = d->offset;
1480 return 0;
1481 }
1482
1483 /* Store, in the inode's containing structure, the block and block
1484 * offset that point to the underlying meta-data for the inode. The
1485 * code below is otherwise similar to the iget() code in
1486 * include/linux/fs.h */
__isofs_iget(struct super_block * sb,unsigned long block,unsigned long offset,int relocated)1487 struct inode *__isofs_iget(struct super_block *sb,
1488 unsigned long block,
1489 unsigned long offset,
1490 int relocated)
1491 {
1492 unsigned long hashval;
1493 struct inode *inode;
1494 struct isofs_iget5_callback_data data;
1495 long ret;
1496
1497 if (offset >= 1ul << sb->s_blocksize_bits)
1498 return ERR_PTR(-EINVAL);
1499
1500 data.block = block;
1501 data.offset = offset;
1502
1503 hashval = (block << sb->s_blocksize_bits) | offset;
1504
1505 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1506 &isofs_iget5_set, &data);
1507
1508 if (!inode)
1509 return ERR_PTR(-ENOMEM);
1510
1511 if (inode->i_state & I_NEW) {
1512 ret = isofs_read_inode(inode, relocated);
1513 if (ret < 0) {
1514 iget_failed(inode);
1515 inode = ERR_PTR(ret);
1516 } else {
1517 unlock_new_inode(inode);
1518 }
1519 }
1520
1521 return inode;
1522 }
1523
isofs_get_tree(struct fs_context * fc)1524 static int isofs_get_tree(struct fs_context *fc)
1525 {
1526 return get_tree_bdev(fc, isofs_fill_super);
1527 }
1528
isofs_free_fc(struct fs_context * fc)1529 static void isofs_free_fc(struct fs_context *fc)
1530 {
1531 kfree(fc->fs_private);
1532 }
1533
1534 static const struct fs_context_operations isofs_context_ops = {
1535 .parse_param = isofs_parse_param,
1536 .get_tree = isofs_get_tree,
1537 .reconfigure = isofs_reconfigure,
1538 .free = isofs_free_fc,
1539 };
1540
isofs_init_fs_context(struct fs_context * fc)1541 static int isofs_init_fs_context(struct fs_context *fc)
1542 {
1543 struct isofs_options *opt;
1544
1545 opt = kzalloc(sizeof(*opt), GFP_KERNEL);
1546 if (!opt)
1547 return -ENOMEM;
1548
1549 opt->map = 'n';
1550 opt->rock = 1;
1551 opt->joliet = 1;
1552 opt->cruft = 0;
1553 opt->hide = 0;
1554 opt->showassoc = 0;
1555 opt->check = 'u'; /* unset */
1556 opt->nocompress = 0;
1557 opt->blocksize = 1024;
1558 opt->fmode = opt->dmode = ISOFS_INVALID_MODE;
1559 opt->uid_set = 0;
1560 opt->gid_set = 0;
1561 opt->gid = GLOBAL_ROOT_GID;
1562 opt->uid = GLOBAL_ROOT_UID;
1563 opt->iocharset = NULL;
1564 opt->overriderockperm = 0;
1565 opt->session = -1;
1566 opt->sbsector = -1;
1567
1568 fc->fs_private = opt;
1569 fc->ops = &isofs_context_ops;
1570
1571 return 0;
1572 }
1573
1574 static struct file_system_type iso9660_fs_type = {
1575 .owner = THIS_MODULE,
1576 .name = "iso9660",
1577 .kill_sb = kill_block_super,
1578 .fs_flags = FS_REQUIRES_DEV,
1579 .init_fs_context = isofs_init_fs_context,
1580 .parameters = isofs_param_spec,
1581 };
1582 MODULE_ALIAS_FS("iso9660");
1583 MODULE_ALIAS("iso9660");
1584
init_iso9660_fs(void)1585 static int __init init_iso9660_fs(void)
1586 {
1587 int err = init_inodecache();
1588 if (err)
1589 goto out;
1590 #ifdef CONFIG_ZISOFS
1591 err = zisofs_init();
1592 if (err)
1593 goto out1;
1594 #endif
1595 err = register_filesystem(&iso9660_fs_type);
1596 if (err)
1597 goto out2;
1598 return 0;
1599 out2:
1600 #ifdef CONFIG_ZISOFS
1601 zisofs_cleanup();
1602 out1:
1603 #endif
1604 destroy_inodecache();
1605 out:
1606 return err;
1607 }
1608
exit_iso9660_fs(void)1609 static void __exit exit_iso9660_fs(void)
1610 {
1611 unregister_filesystem(&iso9660_fs_type);
1612 #ifdef CONFIG_ZISOFS
1613 zisofs_cleanup();
1614 #endif
1615 destroy_inodecache();
1616 }
1617
1618 module_init(init_iso9660_fs)
1619 module_exit(exit_iso9660_fs)
1620 MODULE_DESCRIPTION("ISO 9660 CDROM file system support");
1621 MODULE_LICENSE("GPL");
1622