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Linux/fs/isofs/inode.c

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  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/parser.h>
 25 #include <linux/mpage.h>
 26 #include <linux/user_namespace.h>
 27 #include <linux/seq_file.h>
 28 #include <linux/blkdev.h>
 29 
 30 #include "isofs.h"
 31 #include "zisofs.h"
 32 
 33 /* max tz offset is 13 hours */
 34 #define MAX_TZ_OFFSET (52*15*60)
 35 
 36 #define BEQUIET
 37 
 38 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
 39 static int isofs_dentry_cmpi(const struct dentry *dentry,
 40                 unsigned int len, const char *str, const struct qstr *name);
 41 
 42 #ifdef CONFIG_JOLIET
 43 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
 44 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
 45 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
 46                 unsigned int len, const char *str, const struct qstr *name);
 47 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
 48                 unsigned int len, const char *str, const struct qstr *name);
 49 #endif
 50 
 51 static void isofs_put_super(struct super_block *sb)
 52 {
 53         struct isofs_sb_info *sbi = ISOFS_SB(sb);
 54 
 55 #ifdef CONFIG_JOLIET
 56         unload_nls(sbi->s_nls_iocharset);
 57 #endif
 58 
 59         kfree(sbi);
 60         sb->s_fs_info = NULL;
 61         return;
 62 }
 63 
 64 static int isofs_read_inode(struct inode *, int relocated);
 65 static int isofs_statfs (struct dentry *, struct kstatfs *);
 66 static int isofs_show_options(struct seq_file *, struct dentry *);
 67 
 68 static struct kmem_cache *isofs_inode_cachep;
 69 
 70 static struct inode *isofs_alloc_inode(struct super_block *sb)
 71 {
 72         struct iso_inode_info *ei;
 73         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
 74         if (!ei)
 75                 return NULL;
 76         return &ei->vfs_inode;
 77 }
 78 
 79 static void isofs_free_inode(struct inode *inode)
 80 {
 81         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
 82 }
 83 
 84 static void init_once(void *foo)
 85 {
 86         struct iso_inode_info *ei = foo;
 87 
 88         inode_init_once(&ei->vfs_inode);
 89 }
 90 
 91 static int __init init_inodecache(void)
 92 {
 93         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
 94                                         sizeof(struct iso_inode_info),
 95                                         0, (SLAB_RECLAIM_ACCOUNT|
 96                                         SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 97                                         init_once);
 98         if (!isofs_inode_cachep)
 99                 return -ENOMEM;
100         return 0;
101 }
102 
103 static void destroy_inodecache(void)
104 {
105         /*
106          * Make sure all delayed rcu free inodes are flushed before we
107          * destroy cache.
108          */
109         rcu_barrier();
110         kmem_cache_destroy(isofs_inode_cachep);
111 }
112 
113 static int isofs_remount(struct super_block *sb, int *flags, char *data)
114 {
115         sync_filesystem(sb);
116         if (!(*flags & SB_RDONLY))
117                 return -EROFS;
118         return 0;
119 }
120 
121 static const struct super_operations isofs_sops = {
122         .alloc_inode    = isofs_alloc_inode,
123         .free_inode     = isofs_free_inode,
124         .put_super      = isofs_put_super,
125         .statfs         = isofs_statfs,
126         .remount_fs     = isofs_remount,
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 iso9660_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 int utf8:1;
159         unsigned char map;
160         unsigned char check;
161         unsigned int blocksize;
162         umode_t fmode;
163         umode_t dmode;
164         kgid_t gid;
165         kuid_t uid;
166         char *iocharset;
167         /* LVE */
168         s32 session;
169         s32 sbsector;
170 };
171 
172 /*
173  * Compute the hash for the isofs name corresponding to the dentry.
174  */
175 static int
176 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
177 {
178         const char *name;
179         int len;
180         char c;
181         unsigned long hash;
182 
183         len = qstr->len;
184         name = qstr->name;
185         if (ms) {
186                 while (len && name[len-1] == '.')
187                         len--;
188         }
189 
190         hash = init_name_hash(dentry);
191         while (len--) {
192                 c = tolower(*name++);
193                 hash = partial_name_hash(c, hash);
194         }
195         qstr->hash = end_name_hash(hash);
196 
197         return 0;
198 }
199 
200 /*
201  * Compare of two isofs names.
202  */
203 static int isofs_dentry_cmp_common(
204                 unsigned int len, const char *str,
205                 const struct qstr *name, int ms, int ci)
206 {
207         int alen, blen;
208 
209         /* A filename cannot end in '.' or we treat it like it has none */
210         alen = name->len;
211         blen = len;
212         if (ms) {
213                 while (alen && name->name[alen-1] == '.')
214                         alen--;
215                 while (blen && str[blen-1] == '.')
216                         blen--;
217         }
218         if (alen == blen) {
219                 if (ci) {
220                         if (strncasecmp(name->name, str, alen) == 0)
221                                 return 0;
222                 } else {
223                         if (strncmp(name->name, str, alen) == 0)
224                                 return 0;
225                 }
226         }
227         return 1;
228 }
229 
230 static int
231 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
232 {
233         return isofs_hashi_common(dentry, qstr, 0);
234 }
235 
236 static int
237 isofs_dentry_cmpi(const struct dentry *dentry,
238                 unsigned int len, const char *str, const struct qstr *name)
239 {
240         return isofs_dentry_cmp_common(len, str, name, 0, 1);
241 }
242 
243 #ifdef CONFIG_JOLIET
244 /*
245  * Compute the hash for the isofs name corresponding to the dentry.
246  */
247 static int
248 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
249 {
250         const char *name;
251         int len;
252 
253         len = qstr->len;
254         name = qstr->name;
255         if (ms) {
256                 while (len && name[len-1] == '.')
257                         len--;
258         }
259 
260         qstr->hash = full_name_hash(dentry, name, len);
261 
262         return 0;
263 }
264 
265 static int
266 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
267 {
268         return isofs_hash_common(dentry, qstr, 1);
269 }
270 
271 static int
272 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
273 {
274         return isofs_hashi_common(dentry, qstr, 1);
275 }
276 
277 static int
278 isofs_dentry_cmp_ms(const struct dentry *dentry,
279                 unsigned int len, const char *str, const struct qstr *name)
280 {
281         return isofs_dentry_cmp_common(len, str, name, 1, 0);
282 }
283 
284 static int
285 isofs_dentry_cmpi_ms(const struct dentry *dentry,
286                 unsigned int len, const char *str, const struct qstr *name)
287 {
288         return isofs_dentry_cmp_common(len, str, name, 1, 1);
289 }
290 #endif
291 
292 enum {
293         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
294         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
295         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
296         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
297 };
298 
299 static const match_table_t tokens = {
300         {Opt_norock, "norock"},
301         {Opt_nojoliet, "nojoliet"},
302         {Opt_unhide, "unhide"},
303         {Opt_hide, "hide"},
304         {Opt_showassoc, "showassoc"},
305         {Opt_cruft, "cruft"},
306         {Opt_utf8, "utf8"},
307         {Opt_iocharset, "iocharset=%s"},
308         {Opt_map_a, "map=acorn"},
309         {Opt_map_a, "map=a"},
310         {Opt_map_n, "map=normal"},
311         {Opt_map_n, "map=n"},
312         {Opt_map_o, "map=off"},
313         {Opt_map_o, "map=o"},
314         {Opt_session, "session=%u"},
315         {Opt_sb, "sbsector=%u"},
316         {Opt_check_r, "check=relaxed"},
317         {Opt_check_r, "check=r"},
318         {Opt_check_s, "check=strict"},
319         {Opt_check_s, "check=s"},
320         {Opt_uid, "uid=%u"},
321         {Opt_gid, "gid=%u"},
322         {Opt_mode, "mode=%u"},
323         {Opt_dmode, "dmode=%u"},
324         {Opt_overriderockperm, "overriderockperm"},
325         {Opt_block, "block=%u"},
326         {Opt_ignore, "conv=binary"},
327         {Opt_ignore, "conv=b"},
328         {Opt_ignore, "conv=text"},
329         {Opt_ignore, "conv=t"},
330         {Opt_ignore, "conv=mtext"},
331         {Opt_ignore, "conv=m"},
332         {Opt_ignore, "conv=auto"},
333         {Opt_ignore, "conv=a"},
334         {Opt_nocompress, "nocompress"},
335         {Opt_err, NULL}
336 };
337 
338 static int parse_options(char *options, struct iso9660_options *popt)
339 {
340         char *p;
341         int option;
342 
343         popt->map = 'n';
344         popt->rock = 1;
345         popt->joliet = 1;
346         popt->cruft = 0;
347         popt->hide = 0;
348         popt->showassoc = 0;
349         popt->check = 'u';              /* unset */
350         popt->nocompress = 0;
351         popt->blocksize = 1024;
352         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
353         popt->uid_set = 0;
354         popt->gid_set = 0;
355         popt->gid = GLOBAL_ROOT_GID;
356         popt->uid = GLOBAL_ROOT_UID;
357         popt->iocharset = NULL;
358         popt->utf8 = 0;
359         popt->overriderockperm = 0;
360         popt->session=-1;
361         popt->sbsector=-1;
362         if (!options)
363                 return 1;
364 
365         while ((p = strsep(&options, ",")) != NULL) {
366                 int token;
367                 substring_t args[MAX_OPT_ARGS];
368                 unsigned n;
369 
370                 if (!*p)
371                         continue;
372 
373                 token = match_token(p, tokens, args);
374                 switch (token) {
375                 case Opt_norock:
376                         popt->rock = 0;
377                         break;
378                 case Opt_nojoliet:
379                         popt->joliet = 0;
380                         break;
381                 case Opt_hide:
382                         popt->hide = 1;
383                         break;
384                 case Opt_unhide:
385                 case Opt_showassoc:
386                         popt->showassoc = 1;
387                         break;
388                 case Opt_cruft:
389                         popt->cruft = 1;
390                         break;
391                 case Opt_utf8:
392                         popt->utf8 = 1;
393                         break;
394 #ifdef CONFIG_JOLIET
395                 case Opt_iocharset:
396                         kfree(popt->iocharset);
397                         popt->iocharset = match_strdup(&args[0]);
398                         if (!popt->iocharset)
399                                 return 0;
400                         break;
401 #endif
402                 case Opt_map_a:
403                         popt->map = 'a';
404                         break;
405                 case Opt_map_o:
406                         popt->map = 'o';
407                         break;
408                 case Opt_map_n:
409                         popt->map = 'n';
410                         break;
411                 case Opt_session:
412                         if (match_int(&args[0], &option))
413                                 return 0;
414                         n = option;
415                         /*
416                          * Track numbers are supposed to be in range 1-99, the
417                          * mount option starts indexing at 0.
418                          */
419                         if (n >= 99)
420                                 return 0;
421                         popt->session = n + 1;
422                         break;
423                 case Opt_sb:
424                         if (match_int(&args[0], &option))
425                                 return 0;
426                         popt->sbsector = option;
427                         break;
428                 case Opt_check_r:
429                         popt->check = 'r';
430                         break;
431                 case Opt_check_s:
432                         popt->check = 's';
433                         break;
434                 case Opt_ignore:
435                         break;
436                 case Opt_uid:
437                         if (match_int(&args[0], &option))
438                                 return 0;
439                         popt->uid = make_kuid(current_user_ns(), option);
440                         if (!uid_valid(popt->uid))
441                                 return 0;
442                         popt->uid_set = 1;
443                         break;
444                 case Opt_gid:
445                         if (match_int(&args[0], &option))
446                                 return 0;
447                         popt->gid = make_kgid(current_user_ns(), option);
448                         if (!gid_valid(popt->gid))
449                                 return 0;
450                         popt->gid_set = 1;
451                         break;
452                 case Opt_mode:
453                         if (match_int(&args[0], &option))
454                                 return 0;
455                         popt->fmode = option;
456                         break;
457                 case Opt_dmode:
458                         if (match_int(&args[0], &option))
459                                 return 0;
460                         popt->dmode = option;
461                         break;
462                 case Opt_overriderockperm:
463                         popt->overriderockperm = 1;
464                         break;
465                 case Opt_block:
466                         if (match_int(&args[0], &option))
467                                 return 0;
468                         n = option;
469                         if (n != 512 && n != 1024 && n != 2048)
470                                 return 0;
471                         popt->blocksize = n;
472                         break;
473                 case Opt_nocompress:
474                         popt->nocompress = 1;
475                         break;
476                 default:
477                         return 0;
478                 }
479         }
480         return 1;
481 }
482 
483 /*
484  * Display the mount options in /proc/mounts.
485  */
486 static int isofs_show_options(struct seq_file *m, struct dentry *root)
487 {
488         struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
489 
490         if (!sbi->s_rock)               seq_puts(m, ",norock");
491         else if (!sbi->s_joliet_level)  seq_puts(m, ",nojoliet");
492         if (sbi->s_cruft)               seq_puts(m, ",cruft");
493         if (sbi->s_hide)                seq_puts(m, ",hide");
494         if (sbi->s_nocompress)          seq_puts(m, ",nocompress");
495         if (sbi->s_overriderockperm)    seq_puts(m, ",overriderockperm");
496         if (sbi->s_showassoc)           seq_puts(m, ",showassoc");
497         if (sbi->s_utf8)                seq_puts(m, ",utf8");
498 
499         if (sbi->s_check)               seq_printf(m, ",check=%c", sbi->s_check);
500         if (sbi->s_mapping)             seq_printf(m, ",map=%c", sbi->s_mapping);
501         if (sbi->s_session != 255)      seq_printf(m, ",session=%u", sbi->s_session - 1);
502         if (sbi->s_sbsector != -1)      seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
503 
504         if (root->d_sb->s_blocksize != 1024)
505                 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
506 
507         if (sbi->s_uid_set)
508                 seq_printf(m, ",uid=%u",
509                            from_kuid_munged(&init_user_ns, sbi->s_uid));
510         if (sbi->s_gid_set)
511                 seq_printf(m, ",gid=%u",
512                            from_kgid_munged(&init_user_ns, sbi->s_gid));
513 
514         if (sbi->s_dmode != ISOFS_INVALID_MODE)
515                 seq_printf(m, ",dmode=%o", sbi->s_dmode);
516         if (sbi->s_fmode != ISOFS_INVALID_MODE)
517                 seq_printf(m, ",fmode=%o", sbi->s_fmode);
518 
519 #ifdef CONFIG_JOLIET
520         if (sbi->s_nls_iocharset &&
521             strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
522                 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
523 #endif
524         return 0;
525 }
526 
527 /*
528  * look if the driver can tell the multi session redirection value
529  *
530  * don't change this if you don't know what you do, please!
531  * Multisession is legal only with XA disks.
532  * A non-XA disk with more than one volume descriptor may do it right, but
533  * usually is written in a nowhere standardized "multi-partition" manner.
534  * Multisession uses absolute addressing (solely the first frame of the whole
535  * track is #0), multi-partition uses relative addressing (each first frame of
536  * each track is #0), and a track is not a session.
537  *
538  * A broken CDwriter software or drive firmware does not set new standards,
539  * at least not if conflicting with the existing ones.
540  *
541  * emoenke@gwdg.de
542  */
543 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
544 
545 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
546 {
547         struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
548         unsigned int vol_desc_start = 0;
549 
550         if (session > 0) {
551                 struct cdrom_tocentry te;
552 
553                 if (!cdi)
554                         return 0;
555 
556                 te.cdte_track = session;
557                 te.cdte_format = CDROM_LBA;
558                 if (cdrom_read_tocentry(cdi, &te) == 0) {
559                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
560                                 session, te.cdte_addr.lba,
561                                 te.cdte_ctrl & CDROM_DATA_TRACK);
562                         if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
563                                 return te.cdte_addr.lba;
564                 }
565 
566                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
567         }
568 
569         if (cdi) {
570                 struct cdrom_multisession ms_info;
571 
572                 ms_info.addr_format = CDROM_LBA;
573                 if (cdrom_multisession(cdi, &ms_info) == 0) {
574 #if WE_OBEY_THE_WRITTEN_STANDARDS
575                         /* necessary for a valid ms_info.addr */
576                         if (ms_info.xa_flag)
577 #endif
578                                 vol_desc_start = ms_info.addr.lba;
579                 }
580         }
581 
582         return vol_desc_start;
583 }
584 
585 /*
586  * Check if root directory is empty (has less than 3 files).
587  *
588  * Used to detect broken CDs where ISO root directory is empty but Joliet root
589  * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
590  * (and Joliet used instead) or else no files would be visible.
591  */
592 static bool rootdir_empty(struct super_block *sb, unsigned long block)
593 {
594         int offset = 0, files = 0, de_len;
595         struct iso_directory_record *de;
596         struct buffer_head *bh;
597 
598         bh = sb_bread(sb, block);
599         if (!bh)
600                 return true;
601         while (files < 3) {
602                 de = (struct iso_directory_record *) (bh->b_data + offset);
603                 de_len = *(unsigned char *) de;
604                 if (de_len == 0)
605                         break;
606                 files++;
607                 offset += de_len;
608         }
609         brelse(bh);
610         return files < 3;
611 }
612 
613 /*
614  * Initialize the superblock and read the root inode.
615  *
616  * Note: a check_disk_change() has been done immediately prior
617  * to this call, so we don't need to check again.
618  */
619 static int isofs_fill_super(struct super_block *s, void *data, int silent)
620 {
621         struct buffer_head *bh = NULL, *pri_bh = NULL;
622         struct hs_primary_descriptor *h_pri = NULL;
623         struct iso_primary_descriptor *pri = NULL;
624         struct iso_supplementary_descriptor *sec = NULL;
625         struct iso_directory_record *rootp;
626         struct inode *inode;
627         struct iso9660_options opt;
628         struct isofs_sb_info *sbi;
629         unsigned long first_data_zone;
630         int joliet_level = 0;
631         int iso_blknum, block;
632         int orig_zonesize;
633         int table, error = -EINVAL;
634         unsigned int vol_desc_start;
635 
636         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
637         if (!sbi)
638                 return -ENOMEM;
639         s->s_fs_info = sbi;
640 
641         if (!parse_options((char *)data, &opt))
642                 goto out_freesbi;
643 
644         /*
645          * First of all, get the hardware blocksize for this device.
646          * If we don't know what it is, or the hardware blocksize is
647          * larger than the blocksize the user specified, then use
648          * that value.
649          */
650         /*
651          * What if bugger tells us to go beyond page size?
652          */
653         if (bdev_logical_block_size(s->s_bdev) > 2048) {
654                 printk(KERN_WARNING
655                        "ISOFS: unsupported/invalid hardware sector size %d\n",
656                         bdev_logical_block_size(s->s_bdev));
657                 goto out_freesbi;
658         }
659         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
660 
661         sbi->s_high_sierra = 0; /* default is iso9660 */
662         sbi->s_session = opt.session;
663         sbi->s_sbsector = opt.sbsector;
664 
665         vol_desc_start = (opt.sbsector != -1) ?
666                 opt.sbsector : isofs_get_last_session(s,opt.session);
667 
668         for (iso_blknum = vol_desc_start+16;
669                 iso_blknum < vol_desc_start+100; iso_blknum++) {
670                 struct hs_volume_descriptor *hdp;
671                 struct iso_volume_descriptor  *vdp;
672 
673                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
674                 if (!(bh = sb_bread(s, block)))
675                         goto out_no_read;
676 
677                 vdp = (struct iso_volume_descriptor *)bh->b_data;
678                 hdp = (struct hs_volume_descriptor *)bh->b_data;
679 
680                 /*
681                  * Due to the overlapping physical location of the descriptors,
682                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
683                  * proper identification in this case, we first check for ISO.
684                  */
685                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
686                         if (isonum_711(vdp->type) == ISO_VD_END)
687                                 break;
688                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
689                                 if (!pri) {
690                                         pri = (struct iso_primary_descriptor *)vdp;
691                                         /* Save the buffer in case we need it ... */
692                                         pri_bh = bh;
693                                         bh = NULL;
694                                 }
695                         }
696 #ifdef CONFIG_JOLIET
697                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
698                                 sec = (struct iso_supplementary_descriptor *)vdp;
699                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
700                                         if (opt.joliet) {
701                                                 if (sec->escape[2] == 0x40)
702                                                         joliet_level = 1;
703                                                 else if (sec->escape[2] == 0x43)
704                                                         joliet_level = 2;
705                                                 else if (sec->escape[2] == 0x45)
706                                                         joliet_level = 3;
707 
708                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
709                                                         "Microsoft Joliet Level %d\n",
710                                                         joliet_level);
711                                         }
712                                         goto root_found;
713                                 } else {
714                                 /* Unknown supplementary volume descriptor */
715                                 sec = NULL;
716                                 }
717                         }
718 #endif
719                 } else {
720                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
721                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
722                                         goto out_freebh;
723 
724                                 sbi->s_high_sierra = 1;
725                                 opt.rock = 0;
726                                 h_pri = (struct hs_primary_descriptor *)vdp;
727                                 goto root_found;
728                         }
729                 }
730 
731                 /* Just skip any volume descriptors we don't recognize */
732 
733                 brelse(bh);
734                 bh = NULL;
735         }
736         /*
737          * If we fall through, either no volume descriptor was found,
738          * or else we passed a primary descriptor looking for others.
739          */
740         if (!pri)
741                 goto out_unknown_format;
742         brelse(bh);
743         bh = pri_bh;
744         pri_bh = NULL;
745 
746 root_found:
747         /* We don't support read-write mounts */
748         if (!sb_rdonly(s)) {
749                 error = -EACCES;
750                 goto out_freebh;
751         }
752 
753         if (joliet_level && (!pri || !opt.rock)) {
754                 /* This is the case of Joliet with the norock mount flag.
755                  * A disc with both Joliet and Rock Ridge is handled later
756                  */
757                 pri = (struct iso_primary_descriptor *) sec;
758         }
759 
760         if(sbi->s_high_sierra){
761                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
762                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
763                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
764                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
765         } else {
766                 if (!pri)
767                         goto out_freebh;
768                 rootp = (struct iso_directory_record *) pri->root_directory_record;
769                 sbi->s_nzones = isonum_733(pri->volume_space_size);
770                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
771                 sbi->s_max_size = isonum_733(pri->volume_space_size);
772         }
773 
774         sbi->s_ninodes = 0; /* No way to figure this out easily */
775 
776         orig_zonesize = sbi->s_log_zone_size;
777         /*
778          * If the zone size is smaller than the hardware sector size,
779          * this is a fatal error.  This would occur if the disc drive
780          * had sectors that were 2048 bytes, but the filesystem had
781          * blocks that were 512 bytes (which should only very rarely
782          * happen.)
783          */
784         if (orig_zonesize < opt.blocksize)
785                 goto out_bad_size;
786 
787         /* RDE: convert log zone size to bit shift */
788         switch (sbi->s_log_zone_size) {
789         case  512: sbi->s_log_zone_size =  9; break;
790         case 1024: sbi->s_log_zone_size = 10; break;
791         case 2048: sbi->s_log_zone_size = 11; break;
792 
793         default:
794                 goto out_bad_zone_size;
795         }
796 
797         s->s_magic = ISOFS_SUPER_MAGIC;
798 
799         /*
800          * With multi-extent files, file size is only limited by the maximum
801          * size of a file system, which is 8 TB.
802          */
803         s->s_maxbytes = 0x80000000000LL;
804 
805         /* ECMA-119 timestamp from 1900/1/1 with tz offset */
806         s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
807         s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
808 
809         /* Set this for reference. Its not currently used except on write
810            which we don't have .. */
811 
812         first_data_zone = isonum_733(rootp->extent) +
813                           isonum_711(rootp->ext_attr_length);
814         sbi->s_firstdatazone = first_data_zone;
815 #ifndef BEQUIET
816         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
817                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
818         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
819         if(sbi->s_high_sierra)
820                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
821 #endif
822 
823         /*
824          * If the Joliet level is set, we _may_ decide to use the
825          * secondary descriptor, but can't be sure until after we
826          * read the root inode. But before reading the root inode
827          * we may need to change the device blocksize, and would
828          * rather release the old buffer first. So, we cache the
829          * first_data_zone value from the secondary descriptor.
830          */
831         if (joliet_level) {
832                 pri = (struct iso_primary_descriptor *) sec;
833                 rootp = (struct iso_directory_record *)
834                         pri->root_directory_record;
835                 first_data_zone = isonum_733(rootp->extent) +
836                                 isonum_711(rootp->ext_attr_length);
837         }
838 
839         /*
840          * We're all done using the volume descriptor, and may need
841          * to change the device blocksize, so release the buffer now.
842          */
843         brelse(pri_bh);
844         brelse(bh);
845 
846         /*
847          * Force the blocksize to 512 for 512 byte sectors.  The file
848          * read primitives really get it wrong in a bad way if we don't
849          * do this.
850          *
851          * Note - we should never be setting the blocksize to something
852          * less than the hardware sector size for the device.  If we
853          * do, we would end up having to read larger buffers and split
854          * out portions to satisfy requests.
855          *
856          * Note2- the idea here is that we want to deal with the optimal
857          * zonesize in the filesystem.  If we have it set to something less,
858          * then we have horrible problems with trying to piece together
859          * bits of adjacent blocks in order to properly read directory
860          * entries.  By forcing the blocksize in this way, we ensure
861          * that we will never be required to do this.
862          */
863         sb_set_blocksize(s, orig_zonesize);
864 
865         sbi->s_nls_iocharset = NULL;
866 
867 #ifdef CONFIG_JOLIET
868         if (joliet_level && opt.utf8 == 0) {
869                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
870                 sbi->s_nls_iocharset = load_nls(p);
871                 if (! sbi->s_nls_iocharset) {
872                         /* Fail only if explicit charset specified */
873                         if (opt.iocharset)
874                                 goto out_freesbi;
875                         sbi->s_nls_iocharset = load_nls_default();
876                 }
877         }
878 #endif
879         s->s_op = &isofs_sops;
880         s->s_export_op = &isofs_export_ops;
881         sbi->s_mapping = opt.map;
882         sbi->s_rock = (opt.rock ? 2 : 0);
883         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
884         sbi->s_cruft = opt.cruft;
885         sbi->s_hide = opt.hide;
886         sbi->s_showassoc = opt.showassoc;
887         sbi->s_uid = opt.uid;
888         sbi->s_gid = opt.gid;
889         sbi->s_uid_set = opt.uid_set;
890         sbi->s_gid_set = opt.gid_set;
891         sbi->s_utf8 = opt.utf8;
892         sbi->s_nocompress = opt.nocompress;
893         sbi->s_overriderockperm = opt.overriderockperm;
894         /*
895          * It would be incredibly stupid to allow people to mark every file
896          * on the disk as suid, so we merely allow them to set the default
897          * permissions.
898          */
899         if (opt.fmode != ISOFS_INVALID_MODE)
900                 sbi->s_fmode = opt.fmode & 0777;
901         else
902                 sbi->s_fmode = ISOFS_INVALID_MODE;
903         if (opt.dmode != ISOFS_INVALID_MODE)
904                 sbi->s_dmode = opt.dmode & 0777;
905         else
906                 sbi->s_dmode = ISOFS_INVALID_MODE;
907 
908         /*
909          * Read the root inode, which _may_ result in changing
910          * the s_rock flag. Once we have the final s_rock value,
911          * we then decide whether to use the Joliet descriptor.
912          */
913         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
914         if (IS_ERR(inode))
915                 goto out_no_root;
916 
917         /*
918          * Fix for broken CDs with Rock Ridge and empty ISO root directory but
919          * correct Joliet root directory.
920          */
921         if (sbi->s_rock == 1 && joliet_level &&
922                                 rootdir_empty(s, sbi->s_firstdatazone)) {
923                 printk(KERN_NOTICE
924                         "ISOFS: primary root directory is empty. "
925                         "Disabling Rock Ridge and switching to Joliet.");
926                 sbi->s_rock = 0;
927         }
928 
929         /*
930          * If this disk has both Rock Ridge and Joliet on it, then we
931          * want to use Rock Ridge by default.  This can be overridden
932          * by using the norock mount option.  There is still one other
933          * possibility that is not taken into account: a Rock Ridge
934          * CD with Unicode names.  Until someone sees such a beast, it
935          * will not be supported.
936          */
937         if (sbi->s_rock == 1) {
938                 joliet_level = 0;
939         } else if (joliet_level) {
940                 sbi->s_rock = 0;
941                 if (sbi->s_firstdatazone != first_data_zone) {
942                         sbi->s_firstdatazone = first_data_zone;
943                         printk(KERN_DEBUG
944                                 "ISOFS: changing to secondary root\n");
945                         iput(inode);
946                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
947                         if (IS_ERR(inode))
948                                 goto out_no_root;
949                 }
950         }
951 
952         if (opt.check == 'u') {
953                 /* Only Joliet is case insensitive by default */
954                 if (joliet_level)
955                         opt.check = 'r';
956                 else
957                         opt.check = 's';
958         }
959         sbi->s_joliet_level = joliet_level;
960 
961         /* Make sure the root inode is a directory */
962         if (!S_ISDIR(inode->i_mode)) {
963                 printk(KERN_WARNING
964                         "isofs_fill_super: root inode is not a directory. "
965                         "Corrupted media?\n");
966                 goto out_iput;
967         }
968 
969         table = 0;
970         if (joliet_level)
971                 table += 2;
972         if (opt.check == 'r')
973                 table++;
974         sbi->s_check = opt.check;
975 
976         if (table)
977                 s->s_d_op = &isofs_dentry_ops[table - 1];
978 
979         /* get the root dentry */
980         s->s_root = d_make_root(inode);
981         if (!(s->s_root)) {
982                 error = -ENOMEM;
983                 goto out_no_inode;
984         }
985 
986         kfree(opt.iocharset);
987 
988         return 0;
989 
990         /*
991          * Display error messages and free resources.
992          */
993 out_iput:
994         iput(inode);
995         goto out_no_inode;
996 out_no_root:
997         error = PTR_ERR(inode);
998         if (error != -ENOMEM)
999                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
1000 out_no_inode:
1001 #ifdef CONFIG_JOLIET
1002         unload_nls(sbi->s_nls_iocharset);
1003 #endif
1004         goto out_freesbi;
1005 out_no_read:
1006         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1007                 __func__, s->s_id, iso_blknum, block);
1008         goto out_freebh;
1009 out_bad_zone_size:
1010         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1011                 sbi->s_log_zone_size);
1012         goto out_freebh;
1013 out_bad_size:
1014         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1015                 orig_zonesize, opt.blocksize);
1016         goto out_freebh;
1017 out_unknown_format:
1018         if (!silent)
1019                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1020 
1021 out_freebh:
1022         brelse(bh);
1023         brelse(pri_bh);
1024 out_freesbi:
1025         kfree(opt.iocharset);
1026         kfree(sbi);
1027         s->s_fs_info = NULL;
1028         return error;
1029 }
1030 
1031 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1032 {
1033         struct super_block *sb = dentry->d_sb;
1034         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1035 
1036         buf->f_type = ISOFS_SUPER_MAGIC;
1037         buf->f_bsize = sb->s_blocksize;
1038         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1039                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1040         buf->f_bfree = 0;
1041         buf->f_bavail = 0;
1042         buf->f_files = ISOFS_SB(sb)->s_ninodes;
1043         buf->f_ffree = 0;
1044         buf->f_fsid.val[0] = (u32)id;
1045         buf->f_fsid.val[1] = (u32)(id >> 32);
1046         buf->f_namelen = NAME_MAX;
1047         return 0;
1048 }
1049 
1050 /*
1051  * Get a set of blocks; filling in buffer_heads if already allocated
1052  * or getblk() if they are not.  Returns the number of blocks inserted
1053  * (-ve == error.)
1054  */
1055 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1056                      struct buffer_head **bh, unsigned long nblocks)
1057 {
1058         unsigned long b_off = iblock;
1059         unsigned offset, sect_size;
1060         unsigned int firstext;
1061         unsigned long nextblk, nextoff;
1062         int section, rv, error;
1063         struct iso_inode_info *ei = ISOFS_I(inode);
1064 
1065         error = -EIO;
1066         rv = 0;
1067         if (iblock != b_off) {
1068                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1069                 goto abort;
1070         }
1071 
1072 
1073         offset = 0;
1074         firstext = ei->i_first_extent;
1075         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1076         nextblk = ei->i_next_section_block;
1077         nextoff = ei->i_next_section_offset;
1078         section = 0;
1079 
1080         while (nblocks) {
1081                 /* If we are *way* beyond the end of the file, print a message.
1082                  * Access beyond the end of the file up to the next page boundary
1083                  * is normal, however because of the way the page cache works.
1084                  * In this case, we just return 0 so that we can properly fill
1085                  * the page with useless information without generating any
1086                  * I/O errors.
1087                  */
1088                 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1089                         printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1090                                 __func__, b_off,
1091                                 (unsigned long long)inode->i_size);
1092                         goto abort;
1093                 }
1094 
1095                 /* On the last section, nextblk == 0, section size is likely to
1096                  * exceed sect_size by a partial block, and access beyond the
1097                  * end of the file will reach beyond the section size, too.
1098                  */
1099                 while (nextblk && (b_off >= (offset + sect_size))) {
1100                         struct inode *ninode;
1101 
1102                         offset += sect_size;
1103                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1104                         if (IS_ERR(ninode)) {
1105                                 error = PTR_ERR(ninode);
1106                                 goto abort;
1107                         }
1108                         firstext  = ISOFS_I(ninode)->i_first_extent;
1109                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1110                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1111                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1112                         iput(ninode);
1113 
1114                         if (++section > 100) {
1115                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1116                                         " aborting...\n", __func__);
1117                                 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1118                                         "nextblk=%lu nextoff=%lu\n", __func__,
1119                                         b_off, firstext, (unsigned) sect_size,
1120                                         nextblk, nextoff);
1121                                 goto abort;
1122                         }
1123                 }
1124 
1125                 if (*bh) {
1126                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1127                 } else {
1128                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1129                         if (!*bh)
1130                                 goto abort;
1131                 }
1132                 bh++;   /* Next buffer head */
1133                 b_off++;        /* Next buffer offset */
1134                 nblocks--;
1135                 rv++;
1136         }
1137 
1138         error = 0;
1139 abort:
1140         return rv != 0 ? rv : error;
1141 }
1142 
1143 /*
1144  * Used by the standard interfaces.
1145  */
1146 static int isofs_get_block(struct inode *inode, sector_t iblock,
1147                     struct buffer_head *bh_result, int create)
1148 {
1149         int ret;
1150 
1151         if (create) {
1152                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1153                 return -EROFS;
1154         }
1155 
1156         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1157         return ret < 0 ? ret : 0;
1158 }
1159 
1160 static int isofs_bmap(struct inode *inode, sector_t block)
1161 {
1162         struct buffer_head dummy;
1163         int error;
1164 
1165         dummy.b_state = 0;
1166         dummy.b_blocknr = -1000;
1167         error = isofs_get_block(inode, block, &dummy, 0);
1168         if (!error)
1169                 return dummy.b_blocknr;
1170         return 0;
1171 }
1172 
1173 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1174 {
1175         sector_t blknr = isofs_bmap(inode, block);
1176         if (!blknr)
1177                 return NULL;
1178         return sb_bread(inode->i_sb, blknr);
1179 }
1180 
1181 static int isofs_readpage(struct file *file, struct page *page)
1182 {
1183         return mpage_readpage(page, isofs_get_block);
1184 }
1185 
1186 static void isofs_readahead(struct readahead_control *rac)
1187 {
1188         mpage_readahead(rac, isofs_get_block);
1189 }
1190 
1191 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1192 {
1193         return generic_block_bmap(mapping,block,isofs_get_block);
1194 }
1195 
1196 static const struct address_space_operations isofs_aops = {
1197         .readpage = isofs_readpage,
1198         .readahead = isofs_readahead,
1199         .bmap = _isofs_bmap
1200 };
1201 
1202 static int isofs_read_level3_size(struct inode *inode)
1203 {
1204         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1205         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1206         struct buffer_head *bh = NULL;
1207         unsigned long block, offset, block_saved, offset_saved;
1208         int i = 0;
1209         int more_entries = 0;
1210         struct iso_directory_record *tmpde = NULL;
1211         struct iso_inode_info *ei = ISOFS_I(inode);
1212 
1213         inode->i_size = 0;
1214 
1215         /* The first 16 blocks are reserved as the System Area.  Thus,
1216          * no inodes can appear in block 0.  We use this to flag that
1217          * this is the last section. */
1218         ei->i_next_section_block = 0;
1219         ei->i_next_section_offset = 0;
1220 
1221         block = ei->i_iget5_block;
1222         offset = ei->i_iget5_offset;
1223 
1224         do {
1225                 struct iso_directory_record *de;
1226                 unsigned int de_len;
1227 
1228                 if (!bh) {
1229                         bh = sb_bread(inode->i_sb, block);
1230                         if (!bh)
1231                                 goto out_noread;
1232                 }
1233                 de = (struct iso_directory_record *) (bh->b_data + offset);
1234                 de_len = *(unsigned char *) de;
1235 
1236                 if (de_len == 0) {
1237                         brelse(bh);
1238                         bh = NULL;
1239                         ++block;
1240                         offset = 0;
1241                         continue;
1242                 }
1243 
1244                 block_saved = block;
1245                 offset_saved = offset;
1246                 offset += de_len;
1247 
1248                 /* Make sure we have a full directory entry */
1249                 if (offset >= bufsize) {
1250                         int slop = bufsize - offset + de_len;
1251                         if (!tmpde) {
1252                                 tmpde = kmalloc(256, GFP_KERNEL);
1253                                 if (!tmpde)
1254                                         goto out_nomem;
1255                         }
1256                         memcpy(tmpde, de, slop);
1257                         offset &= bufsize - 1;
1258                         block++;
1259                         brelse(bh);
1260                         bh = NULL;
1261                         if (offset) {
1262                                 bh = sb_bread(inode->i_sb, block);
1263                                 if (!bh)
1264                                         goto out_noread;
1265                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1266                         }
1267                         de = tmpde;
1268                 }
1269 
1270                 inode->i_size += isonum_733(de->size);
1271                 if (i == 1) {
1272                         ei->i_next_section_block = block_saved;
1273                         ei->i_next_section_offset = offset_saved;
1274                 }
1275 
1276                 more_entries = de->flags[-high_sierra] & 0x80;
1277 
1278                 i++;
1279                 if (i > 100)
1280                         goto out_toomany;
1281         } while (more_entries);
1282 out:
1283         kfree(tmpde);
1284         if (bh)
1285                 brelse(bh);
1286         return 0;
1287 
1288 out_nomem:
1289         if (bh)
1290                 brelse(bh);
1291         return -ENOMEM;
1292 
1293 out_noread:
1294         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1295         kfree(tmpde);
1296         return -EIO;
1297 
1298 out_toomany:
1299         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1300                 "isofs_read_level3_size: inode=%lu\n",
1301                 __func__, inode->i_ino);
1302         goto out;
1303 }
1304 
1305 static int isofs_read_inode(struct inode *inode, int relocated)
1306 {
1307         struct super_block *sb = inode->i_sb;
1308         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1309         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1310         unsigned long block;
1311         int high_sierra = sbi->s_high_sierra;
1312         struct buffer_head *bh;
1313         struct iso_directory_record *de;
1314         struct iso_directory_record *tmpde = NULL;
1315         unsigned int de_len;
1316         unsigned long offset;
1317         struct iso_inode_info *ei = ISOFS_I(inode);
1318         int ret = -EIO;
1319 
1320         block = ei->i_iget5_block;
1321         bh = sb_bread(inode->i_sb, block);
1322         if (!bh)
1323                 goto out_badread;
1324 
1325         offset = ei->i_iget5_offset;
1326 
1327         de = (struct iso_directory_record *) (bh->b_data + offset);
1328         de_len = *(unsigned char *) de;
1329 
1330         if (offset + de_len > bufsize) {
1331                 int frag1 = bufsize - offset;
1332 
1333                 tmpde = kmalloc(de_len, GFP_KERNEL);
1334                 if (!tmpde) {
1335                         ret = -ENOMEM;
1336                         goto fail;
1337                 }
1338                 memcpy(tmpde, bh->b_data + offset, frag1);
1339                 brelse(bh);
1340                 bh = sb_bread(inode->i_sb, ++block);
1341                 if (!bh)
1342                         goto out_badread;
1343                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1344                 de = tmpde;
1345         }
1346 
1347         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1348                                         ei->i_iget5_offset,
1349                                         ISOFS_BUFFER_BITS(inode));
1350 
1351         /* Assume it is a normal-format file unless told otherwise */
1352         ei->i_file_format = isofs_file_normal;
1353 
1354         if (de->flags[-high_sierra] & 2) {
1355                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1356                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1357                 else
1358                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1359                 set_nlink(inode, 1);    /*
1360                                          * Set to 1.  We know there are 2, but
1361                                          * the find utility tries to optimize
1362                                          * if it is 2, and it screws up.  It is
1363                                          * easier to give 1 which tells find to
1364                                          * do it the hard way.
1365                                          */
1366         } else {
1367                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1368                         inode->i_mode = S_IFREG | sbi->s_fmode;
1369                 } else {
1370                         /*
1371                          * Set default permissions: r-x for all.  The disc
1372                          * could be shared with DOS machines so virtually
1373                          * anything could be a valid executable.
1374                          */
1375                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1376                 }
1377                 set_nlink(inode, 1);
1378         }
1379         inode->i_uid = sbi->s_uid;
1380         inode->i_gid = sbi->s_gid;
1381         inode->i_blocks = 0;
1382 
1383         ei->i_format_parm[0] = 0;
1384         ei->i_format_parm[1] = 0;
1385         ei->i_format_parm[2] = 0;
1386 
1387         ei->i_section_size = isonum_733(de->size);
1388         if (de->flags[-high_sierra] & 0x80) {
1389                 ret = isofs_read_level3_size(inode);
1390                 if (ret < 0)
1391                         goto fail;
1392                 ret = -EIO;
1393         } else {
1394                 ei->i_next_section_block = 0;
1395                 ei->i_next_section_offset = 0;
1396                 inode->i_size = isonum_733(de->size);
1397         }
1398 
1399         /*
1400          * Some dipshit decided to store some other bit of information
1401          * in the high byte of the file length.  Truncate size in case
1402          * this CDROM was mounted with the cruft option.
1403          */
1404 
1405         if (sbi->s_cruft)
1406                 inode->i_size &= 0x00ffffff;
1407 
1408         if (de->interleave[0]) {
1409                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1410                 inode->i_size = 0;
1411         }
1412 
1413         /* I have no idea what file_unit_size is used for, so
1414            we will flag it for now */
1415         if (de->file_unit_size[0] != 0) {
1416                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1417                         inode->i_ino);
1418         }
1419 
1420         /* I have no idea what other flag bits are used for, so
1421            we will flag it for now */
1422 #ifdef DEBUG
1423         if((de->flags[-high_sierra] & ~2)!= 0){
1424                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1425                                 "(%ld %x).\n",
1426                         inode->i_ino, de->flags[-high_sierra]);
1427         }
1428 #endif
1429 
1430         inode->i_mtime.tv_sec =
1431         inode->i_atime.tv_sec =
1432         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1433         inode->i_mtime.tv_nsec =
1434         inode->i_atime.tv_nsec =
1435         inode->i_ctime.tv_nsec = 0;
1436 
1437         ei->i_first_extent = (isonum_733(de->extent) +
1438                         isonum_711(de->ext_attr_length));
1439 
1440         /* Set the number of blocks for stat() - should be done before RR */
1441         inode->i_blocks = (inode->i_size + 511) >> 9;
1442 
1443         /*
1444          * Now test for possible Rock Ridge extensions which will override
1445          * some of these numbers in the inode structure.
1446          */
1447 
1448         if (!high_sierra) {
1449                 parse_rock_ridge_inode(de, inode, relocated);
1450                 /* if we want uid/gid set, override the rock ridge setting */
1451                 if (sbi->s_uid_set)
1452                         inode->i_uid = sbi->s_uid;
1453                 if (sbi->s_gid_set)
1454                         inode->i_gid = sbi->s_gid;
1455         }
1456         /* Now set final access rights if overriding rock ridge setting */
1457         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1458             sbi->s_dmode != ISOFS_INVALID_MODE)
1459                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1460         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1461             sbi->s_fmode != ISOFS_INVALID_MODE)
1462                 inode->i_mode = S_IFREG | sbi->s_fmode;
1463 
1464         /* Install the inode operations vector */
1465         if (S_ISREG(inode->i_mode)) {
1466                 inode->i_fop = &generic_ro_fops;
1467                 switch (ei->i_file_format) {
1468 #ifdef CONFIG_ZISOFS
1469                 case isofs_file_compressed:
1470                         inode->i_data.a_ops = &zisofs_aops;
1471                         break;
1472 #endif
1473                 default:
1474                         inode->i_data.a_ops = &isofs_aops;
1475                         break;
1476                 }
1477         } else if (S_ISDIR(inode->i_mode)) {
1478                 inode->i_op = &isofs_dir_inode_operations;
1479                 inode->i_fop = &isofs_dir_operations;
1480         } else if (S_ISLNK(inode->i_mode)) {
1481                 inode->i_op = &page_symlink_inode_operations;
1482                 inode_nohighmem(inode);
1483                 inode->i_data.a_ops = &isofs_symlink_aops;
1484         } else
1485                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1486                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1487 
1488         ret = 0;
1489 out:
1490         kfree(tmpde);
1491         if (bh)
1492                 brelse(bh);
1493         return ret;
1494 
1495 out_badread:
1496         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1497 fail:
1498         goto out;
1499 }
1500 
1501 struct isofs_iget5_callback_data {
1502         unsigned long block;
1503         unsigned long offset;
1504 };
1505 
1506 static int isofs_iget5_test(struct inode *ino, void *data)
1507 {
1508         struct iso_inode_info *i = ISOFS_I(ino);
1509         struct isofs_iget5_callback_data *d =
1510                 (struct isofs_iget5_callback_data*)data;
1511         return (i->i_iget5_block == d->block)
1512                 && (i->i_iget5_offset == d->offset);
1513 }
1514 
1515 static int isofs_iget5_set(struct inode *ino, void *data)
1516 {
1517         struct iso_inode_info *i = ISOFS_I(ino);
1518         struct isofs_iget5_callback_data *d =
1519                 (struct isofs_iget5_callback_data*)data;
1520         i->i_iget5_block = d->block;
1521         i->i_iget5_offset = d->offset;
1522         return 0;
1523 }
1524 
1525 /* Store, in the inode's containing structure, the block and block
1526  * offset that point to the underlying meta-data for the inode.  The
1527  * code below is otherwise similar to the iget() code in
1528  * include/linux/fs.h */
1529 struct inode *__isofs_iget(struct super_block *sb,
1530                            unsigned long block,
1531                            unsigned long offset,
1532                            int relocated)
1533 {
1534         unsigned long hashval;
1535         struct inode *inode;
1536         struct isofs_iget5_callback_data data;
1537         long ret;
1538 
1539         if (offset >= 1ul << sb->s_blocksize_bits)
1540                 return ERR_PTR(-EINVAL);
1541 
1542         data.block = block;
1543         data.offset = offset;
1544 
1545         hashval = (block << sb->s_blocksize_bits) | offset;
1546 
1547         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1548                                 &isofs_iget5_set, &data);
1549 
1550         if (!inode)
1551                 return ERR_PTR(-ENOMEM);
1552 
1553         if (inode->i_state & I_NEW) {
1554                 ret = isofs_read_inode(inode, relocated);
1555                 if (ret < 0) {
1556                         iget_failed(inode);
1557                         inode = ERR_PTR(ret);
1558                 } else {
1559                         unlock_new_inode(inode);
1560                 }
1561         }
1562 
1563         return inode;
1564 }
1565 
1566 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1567         int flags, const char *dev_name, void *data)
1568 {
1569         return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1570 }
1571 
1572 static struct file_system_type iso9660_fs_type = {
1573         .owner          = THIS_MODULE,
1574         .name           = "iso9660",
1575         .mount          = isofs_mount,
1576         .kill_sb        = kill_block_super,
1577         .fs_flags       = FS_REQUIRES_DEV,
1578 };
1579 MODULE_ALIAS_FS("iso9660");
1580 MODULE_ALIAS("iso9660");
1581 
1582 static int __init init_iso9660_fs(void)
1583 {
1584         int err = init_inodecache();
1585         if (err)
1586                 goto out;
1587 #ifdef CONFIG_ZISOFS
1588         err = zisofs_init();
1589         if (err)
1590                 goto out1;
1591 #endif
1592         err = register_filesystem(&iso9660_fs_type);
1593         if (err)
1594                 goto out2;
1595         return 0;
1596 out2:
1597 #ifdef CONFIG_ZISOFS
1598         zisofs_cleanup();
1599 out1:
1600 #endif
1601         destroy_inodecache();
1602 out:
1603         return err;
1604 }
1605 
1606 static void __exit exit_iso9660_fs(void)
1607 {
1608         unregister_filesystem(&iso9660_fs_type);
1609 #ifdef CONFIG_ZISOFS
1610         zisofs_cleanup();
1611 #endif
1612         destroy_inodecache();
1613 }
1614 
1615 module_init(init_iso9660_fs)
1616 module_exit(exit_iso9660_fs)
1617 MODULE_LICENSE("GPL");
1618 

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