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TOMOYO Linux Cross Reference
Linux/fs/isofs/inode.c

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  1 /*
  2  *  linux/fs/isofs/inode.c
  3  *
  4  *  (C) 1991  Linus Torvalds - minix filesystem
  5  *      1992, 1993, 1994  Eric Youngdale Modified for ISO 9660 filesystem.
  6  *      1994  Eberhard Mönkeberg - multi session handling.
  7  *      1995  Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
  8  *      1997  Gordon Chaffee - Joliet CDs
  9  *      1998  Eric Lammerts - ISO 9660 Level 3
 10  *      2004  Paul Serice - Inode Support pushed out from 4GB to 128GB
 11  *      2004  Paul Serice - NFS Export Operations
 12  */
 13 
 14 #include <linux/init.h>
 15 #include <linux/module.h>
 16 
 17 #include <linux/slab.h>
 18 #include <linux/nls.h>
 19 #include <linux/ctype.h>
 20 #include <linux/statfs.h>
 21 #include <linux/cdrom.h>
 22 #include <linux/parser.h>
 23 #include <linux/mpage.h>
 24 
 25 #include "isofs.h"
 26 #include "zisofs.h"
 27 
 28 #define BEQUIET
 29 
 30 static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
 31                 struct qstr *qstr);
 32 static int isofs_hash(const struct dentry *parent, const struct inode *inode,
 33                 struct qstr *qstr);
 34 static int isofs_dentry_cmpi(const struct dentry *parent,
 35                 const struct inode *pinode,
 36                 const struct dentry *dentry, const struct inode *inode,
 37                 unsigned int len, const char *str, const struct qstr *name);
 38 static int isofs_dentry_cmp(const struct dentry *parent,
 39                 const struct inode *pinode,
 40                 const struct dentry *dentry, const struct inode *inode,
 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, const struct inode *inode,
 45                 struct qstr *qstr);
 46 static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
 47                 struct qstr *qstr);
 48 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
 49                 const struct inode *pinode,
 50                 const struct dentry *dentry, const struct inode *inode,
 51                 unsigned int len, const char *str, const struct qstr *name);
 52 static int isofs_dentry_cmp_ms(const struct dentry *parent,
 53                 const struct inode *pinode,
 54                 const struct dentry *dentry, const struct inode *inode,
 55                 unsigned int len, const char *str, const struct qstr *name);
 56 #endif
 57 
 58 static void isofs_put_super(struct super_block *sb)
 59 {
 60         struct isofs_sb_info *sbi = ISOFS_SB(sb);
 61 
 62 #ifdef CONFIG_JOLIET
 63         unload_nls(sbi->s_nls_iocharset);
 64 #endif
 65 
 66         kfree(sbi);
 67         sb->s_fs_info = NULL;
 68         return;
 69 }
 70 
 71 static int isofs_read_inode(struct inode *, int relocated);
 72 static int isofs_statfs (struct dentry *, struct kstatfs *);
 73 
 74 static struct kmem_cache *isofs_inode_cachep;
 75 
 76 static struct inode *isofs_alloc_inode(struct super_block *sb)
 77 {
 78         struct iso_inode_info *ei;
 79         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
 80         if (!ei)
 81                 return NULL;
 82         return &ei->vfs_inode;
 83 }
 84 
 85 static void isofs_i_callback(struct rcu_head *head)
 86 {
 87         struct inode *inode = container_of(head, struct inode, i_rcu);
 88         INIT_LIST_HEAD(&inode->i_dentry);
 89         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
 90 }
 91 
 92 static void isofs_destroy_inode(struct inode *inode)
 93 {
 94         call_rcu(&inode->i_rcu, isofs_i_callback);
 95 }
 96 
 97 static void init_once(void *foo)
 98 {
 99         struct iso_inode_info *ei = foo;
100 
101         inode_init_once(&ei->vfs_inode);
102 }
103 
104 static int init_inodecache(void)
105 {
106         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
107                                         sizeof(struct iso_inode_info),
108                                         0, (SLAB_RECLAIM_ACCOUNT|
109                                         SLAB_MEM_SPREAD),
110                                         init_once);
111         if (isofs_inode_cachep == NULL)
112                 return -ENOMEM;
113         return 0;
114 }
115 
116 static void destroy_inodecache(void)
117 {
118         kmem_cache_destroy(isofs_inode_cachep);
119 }
120 
121 static int isofs_remount(struct super_block *sb, int *flags, char *data)
122 {
123         if (!(*flags & MS_RDONLY))
124                 return -EROFS;
125         return 0;
126 }
127 
128 static const struct super_operations isofs_sops = {
129         .alloc_inode    = isofs_alloc_inode,
130         .destroy_inode  = isofs_destroy_inode,
131         .put_super      = isofs_put_super,
132         .statfs         = isofs_statfs,
133         .remount_fs     = isofs_remount,
134         .show_options   = generic_show_options,
135 };
136 
137 
138 static const struct dentry_operations isofs_dentry_ops[] = {
139         {
140                 .d_hash         = isofs_hash,
141                 .d_compare      = isofs_dentry_cmp,
142         },
143         {
144                 .d_hash         = isofs_hashi,
145                 .d_compare      = isofs_dentry_cmpi,
146         },
147 #ifdef CONFIG_JOLIET
148         {
149                 .d_hash         = isofs_hash_ms,
150                 .d_compare      = isofs_dentry_cmp_ms,
151         },
152         {
153                 .d_hash         = isofs_hashi_ms,
154                 .d_compare      = isofs_dentry_cmpi_ms,
155         },
156 #endif
157 };
158 
159 struct iso9660_options{
160         unsigned int rock:1;
161         unsigned int joliet:1;
162         unsigned int cruft:1;
163         unsigned int hide:1;
164         unsigned int showassoc:1;
165         unsigned int nocompress:1;
166         unsigned int overriderockperm:1;
167         unsigned int uid_set:1;
168         unsigned int gid_set:1;
169         unsigned int utf8:1;
170         unsigned char map;
171         unsigned char check;
172         unsigned int blocksize;
173         mode_t fmode;
174         mode_t dmode;
175         gid_t gid;
176         uid_t uid;
177         char *iocharset;
178         /* LVE */
179         s32 session;
180         s32 sbsector;
181 };
182 
183 /*
184  * Compute the hash for the isofs name corresponding to the dentry.
185  */
186 static int
187 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
188 {
189         const char *name;
190         int len;
191 
192         len = qstr->len;
193         name = qstr->name;
194         if (ms) {
195                 while (len && name[len-1] == '.')
196                         len--;
197         }
198 
199         qstr->hash = full_name_hash(name, len);
200 
201         return 0;
202 }
203 
204 /*
205  * Compute the hash for the isofs name corresponding to the dentry.
206  */
207 static int
208 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
209 {
210         const char *name;
211         int len;
212         char c;
213         unsigned long hash;
214 
215         len = qstr->len;
216         name = qstr->name;
217         if (ms) {
218                 while (len && name[len-1] == '.')
219                         len--;
220         }
221 
222         hash = init_name_hash();
223         while (len--) {
224                 c = tolower(*name++);
225                 hash = partial_name_hash(c, hash);
226         }
227         qstr->hash = end_name_hash(hash);
228 
229         return 0;
230 }
231 
232 /*
233  * Compare of two isofs names.
234  */
235 static int isofs_dentry_cmp_common(
236                 unsigned int len, const char *str,
237                 const struct qstr *name, int ms, int ci)
238 {
239         int alen, blen;
240 
241         /* A filename cannot end in '.' or we treat it like it has none */
242         alen = name->len;
243         blen = len;
244         if (ms) {
245                 while (alen && name->name[alen-1] == '.')
246                         alen--;
247                 while (blen && str[blen-1] == '.')
248                         blen--;
249         }
250         if (alen == blen) {
251                 if (ci) {
252                         if (strnicmp(name->name, str, alen) == 0)
253                                 return 0;
254                 } else {
255                         if (strncmp(name->name, str, alen) == 0)
256                                 return 0;
257                 }
258         }
259         return 1;
260 }
261 
262 static int
263 isofs_hash(const struct dentry *dentry, const struct inode *inode,
264                 struct qstr *qstr)
265 {
266         return isofs_hash_common(dentry, qstr, 0);
267 }
268 
269 static int
270 isofs_hashi(const struct dentry *dentry, const struct inode *inode,
271                 struct qstr *qstr)
272 {
273         return isofs_hashi_common(dentry, qstr, 0);
274 }
275 
276 static int
277 isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
278                 const struct dentry *dentry, const struct inode *inode,
279                 unsigned int len, const char *str, const struct qstr *name)
280 {
281         return isofs_dentry_cmp_common(len, str, name, 0, 0);
282 }
283 
284 static int
285 isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
286                 const struct dentry *dentry, const struct inode *inode,
287                 unsigned int len, const char *str, const struct qstr *name)
288 {
289         return isofs_dentry_cmp_common(len, str, name, 0, 1);
290 }
291 
292 #ifdef CONFIG_JOLIET
293 static int
294 isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
295                 struct qstr *qstr)
296 {
297         return isofs_hash_common(dentry, qstr, 1);
298 }
299 
300 static int
301 isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
302                 struct qstr *qstr)
303 {
304         return isofs_hashi_common(dentry, qstr, 1);
305 }
306 
307 static int
308 isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
309                 const struct dentry *dentry, const struct inode *inode,
310                 unsigned int len, const char *str, const struct qstr *name)
311 {
312         return isofs_dentry_cmp_common(len, str, name, 1, 0);
313 }
314 
315 static int
316 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
317                 const struct dentry *dentry, const struct inode *inode,
318                 unsigned int len, const char *str, const struct qstr *name)
319 {
320         return isofs_dentry_cmp_common(len, str, name, 1, 1);
321 }
322 #endif
323 
324 enum {
325         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
326         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
327         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
328         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
329 };
330 
331 static const match_table_t tokens = {
332         {Opt_norock, "norock"},
333         {Opt_nojoliet, "nojoliet"},
334         {Opt_unhide, "unhide"},
335         {Opt_hide, "hide"},
336         {Opt_showassoc, "showassoc"},
337         {Opt_cruft, "cruft"},
338         {Opt_utf8, "utf8"},
339         {Opt_iocharset, "iocharset=%s"},
340         {Opt_map_a, "map=acorn"},
341         {Opt_map_a, "map=a"},
342         {Opt_map_n, "map=normal"},
343         {Opt_map_n, "map=n"},
344         {Opt_map_o, "map=off"},
345         {Opt_map_o, "map=o"},
346         {Opt_session, "session=%u"},
347         {Opt_sb, "sbsector=%u"},
348         {Opt_check_r, "check=relaxed"},
349         {Opt_check_r, "check=r"},
350         {Opt_check_s, "check=strict"},
351         {Opt_check_s, "check=s"},
352         {Opt_uid, "uid=%u"},
353         {Opt_gid, "gid=%u"},
354         {Opt_mode, "mode=%u"},
355         {Opt_dmode, "dmode=%u"},
356         {Opt_overriderockperm, "overriderockperm"},
357         {Opt_block, "block=%u"},
358         {Opt_ignore, "conv=binary"},
359         {Opt_ignore, "conv=b"},
360         {Opt_ignore, "conv=text"},
361         {Opt_ignore, "conv=t"},
362         {Opt_ignore, "conv=mtext"},
363         {Opt_ignore, "conv=m"},
364         {Opt_ignore, "conv=auto"},
365         {Opt_ignore, "conv=a"},
366         {Opt_nocompress, "nocompress"},
367         {Opt_err, NULL}
368 };
369 
370 static int parse_options(char *options, struct iso9660_options *popt)
371 {
372         char *p;
373         int option;
374 
375         popt->map = 'n';
376         popt->rock = 1;
377         popt->joliet = 1;
378         popt->cruft = 0;
379         popt->hide = 0;
380         popt->showassoc = 0;
381         popt->check = 'u';              /* unset */
382         popt->nocompress = 0;
383         popt->blocksize = 1024;
384         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
385         popt->uid_set = 0;
386         popt->gid_set = 0;
387         popt->gid = 0;
388         popt->uid = 0;
389         popt->iocharset = NULL;
390         popt->utf8 = 0;
391         popt->overriderockperm = 0;
392         popt->session=-1;
393         popt->sbsector=-1;
394         if (!options)
395                 return 1;
396 
397         while ((p = strsep(&options, ",")) != NULL) {
398                 int token;
399                 substring_t args[MAX_OPT_ARGS];
400                 unsigned n;
401 
402                 if (!*p)
403                         continue;
404 
405                 token = match_token(p, tokens, args);
406                 switch (token) {
407                 case Opt_norock:
408                         popt->rock = 0;
409                         break;
410                 case Opt_nojoliet:
411                         popt->joliet = 0;
412                         break;
413                 case Opt_hide:
414                         popt->hide = 1;
415                         break;
416                 case Opt_unhide:
417                 case Opt_showassoc:
418                         popt->showassoc = 1;
419                         break;
420                 case Opt_cruft:
421                         popt->cruft = 1;
422                         break;
423                 case Opt_utf8:
424                         popt->utf8 = 1;
425                         break;
426 #ifdef CONFIG_JOLIET
427                 case Opt_iocharset:
428                         popt->iocharset = match_strdup(&args[0]);
429                         break;
430 #endif
431                 case Opt_map_a:
432                         popt->map = 'a';
433                         break;
434                 case Opt_map_o:
435                         popt->map = 'o';
436                         break;
437                 case Opt_map_n:
438                         popt->map = 'n';
439                         break;
440                 case Opt_session:
441                         if (match_int(&args[0], &option))
442                                 return 0;
443                         n = option;
444                         if (n > 99)
445                                 return 0;
446                         popt->session = n + 1;
447                         break;
448                 case Opt_sb:
449                         if (match_int(&args[0], &option))
450                                 return 0;
451                         popt->sbsector = option;
452                         break;
453                 case Opt_check_r:
454                         popt->check = 'r';
455                         break;
456                 case Opt_check_s:
457                         popt->check = 's';
458                         break;
459                 case Opt_ignore:
460                         break;
461                 case Opt_uid:
462                         if (match_int(&args[0], &option))
463                                 return 0;
464                         popt->uid = option;
465                         popt->uid_set = 1;
466                         break;
467                 case Opt_gid:
468                         if (match_int(&args[0], &option))
469                                 return 0;
470                         popt->gid = option;
471                         popt->gid_set = 1;
472                         break;
473                 case Opt_mode:
474                         if (match_int(&args[0], &option))
475                                 return 0;
476                         popt->fmode = option;
477                         break;
478                 case Opt_dmode:
479                         if (match_int(&args[0], &option))
480                                 return 0;
481                         popt->dmode = option;
482                         break;
483                 case Opt_overriderockperm:
484                         popt->overriderockperm = 1;
485                         break;
486                 case Opt_block:
487                         if (match_int(&args[0], &option))
488                                 return 0;
489                         n = option;
490                         if (n != 512 && n != 1024 && n != 2048)
491                                 return 0;
492                         popt->blocksize = n;
493                         break;
494                 case Opt_nocompress:
495                         popt->nocompress = 1;
496                         break;
497                 default:
498                         return 0;
499                 }
500         }
501         return 1;
502 }
503 
504 /*
505  * look if the driver can tell the multi session redirection value
506  *
507  * don't change this if you don't know what you do, please!
508  * Multisession is legal only with XA disks.
509  * A non-XA disk with more than one volume descriptor may do it right, but
510  * usually is written in a nowhere standardized "multi-partition" manner.
511  * Multisession uses absolute addressing (solely the first frame of the whole
512  * track is #0), multi-partition uses relative addressing (each first frame of
513  * each track is #0), and a track is not a session.
514  *
515  * A broken CDwriter software or drive firmware does not set new standards,
516  * at least not if conflicting with the existing ones.
517  *
518  * emoenke@gwdg.de
519  */
520 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
521 
522 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
523 {
524         struct cdrom_multisession ms_info;
525         unsigned int vol_desc_start;
526         struct block_device *bdev = sb->s_bdev;
527         int i;
528 
529         vol_desc_start=0;
530         ms_info.addr_format=CDROM_LBA;
531         if(session >= 0 && session <= 99) {
532                 struct cdrom_tocentry Te;
533                 Te.cdte_track=session;
534                 Te.cdte_format=CDROM_LBA;
535                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
536                 if (!i) {
537                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
538                                 session, Te.cdte_addr.lba,
539                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
540                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
541                                 return Te.cdte_addr.lba;
542                 }
543 
544                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
545         }
546         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
547         if (session > 0)
548                 printk(KERN_ERR "ISOFS: Invalid session number\n");
549 #if 0
550         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
551         if (i==0) {
552                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
553                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
554         }
555 #endif
556         if (i==0)
557 #if WE_OBEY_THE_WRITTEN_STANDARDS
558                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
559 #endif
560                         vol_desc_start=ms_info.addr.lba;
561         return vol_desc_start;
562 }
563 
564 /*
565  * Check if root directory is empty (has less than 3 files).
566  *
567  * Used to detect broken CDs where ISO root directory is empty but Joliet root
568  * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
569  * (and Joliet used instead) or else no files would be visible.
570  */
571 static bool rootdir_empty(struct super_block *sb, unsigned long block)
572 {
573         int offset = 0, files = 0, de_len;
574         struct iso_directory_record *de;
575         struct buffer_head *bh;
576 
577         bh = sb_bread(sb, block);
578         if (!bh)
579                 return true;
580         while (files < 3) {
581                 de = (struct iso_directory_record *) (bh->b_data + offset);
582                 de_len = *(unsigned char *) de;
583                 if (de_len == 0)
584                         break;
585                 files++;
586                 offset += de_len;
587         }
588         brelse(bh);
589         return files < 3;
590 }
591 
592 /*
593  * Initialize the superblock and read the root inode.
594  *
595  * Note: a check_disk_change() has been done immediately prior
596  * to this call, so we don't need to check again.
597  */
598 static int isofs_fill_super(struct super_block *s, void *data, int silent)
599 {
600         struct buffer_head *bh = NULL, *pri_bh = NULL;
601         struct hs_primary_descriptor *h_pri = NULL;
602         struct iso_primary_descriptor *pri = NULL;
603         struct iso_supplementary_descriptor *sec = NULL;
604         struct iso_directory_record *rootp;
605         struct inode *inode;
606         struct iso9660_options opt;
607         struct isofs_sb_info *sbi;
608         unsigned long first_data_zone;
609         int joliet_level = 0;
610         int iso_blknum, block;
611         int orig_zonesize;
612         int table, error = -EINVAL;
613         unsigned int vol_desc_start;
614 
615         save_mount_options(s, data);
616 
617         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
618         if (!sbi)
619                 return -ENOMEM;
620         s->s_fs_info = sbi;
621 
622         if (!parse_options((char *)data, &opt))
623                 goto out_freesbi;
624 
625         /*
626          * First of all, get the hardware blocksize for this device.
627          * If we don't know what it is, or the hardware blocksize is
628          * larger than the blocksize the user specified, then use
629          * that value.
630          */
631         /*
632          * What if bugger tells us to go beyond page size?
633          */
634         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
635 
636         sbi->s_high_sierra = 0; /* default is iso9660 */
637 
638         vol_desc_start = (opt.sbsector != -1) ?
639                 opt.sbsector : isofs_get_last_session(s,opt.session);
640 
641         for (iso_blknum = vol_desc_start+16;
642                 iso_blknum < vol_desc_start+100; iso_blknum++) {
643                 struct hs_volume_descriptor *hdp;
644                 struct iso_volume_descriptor  *vdp;
645 
646                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
647                 if (!(bh = sb_bread(s, block)))
648                         goto out_no_read;
649 
650                 vdp = (struct iso_volume_descriptor *)bh->b_data;
651                 hdp = (struct hs_volume_descriptor *)bh->b_data;
652 
653                 /*
654                  * Due to the overlapping physical location of the descriptors,
655                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
656                  * proper identification in this case, we first check for ISO.
657                  */
658                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
659                         if (isonum_711(vdp->type) == ISO_VD_END)
660                                 break;
661                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
662                                 if (pri == NULL) {
663                                         pri = (struct iso_primary_descriptor *)vdp;
664                                         /* Save the buffer in case we need it ... */
665                                         pri_bh = bh;
666                                         bh = NULL;
667                                 }
668                         }
669 #ifdef CONFIG_JOLIET
670                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
671                                 sec = (struct iso_supplementary_descriptor *)vdp;
672                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
673                                         if (opt.joliet) {
674                                                 if (sec->escape[2] == 0x40)
675                                                         joliet_level = 1;
676                                                 else if (sec->escape[2] == 0x43)
677                                                         joliet_level = 2;
678                                                 else if (sec->escape[2] == 0x45)
679                                                         joliet_level = 3;
680 
681                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
682                                                         "Microsoft Joliet Level %d\n",
683                                                         joliet_level);
684                                         }
685                                         goto root_found;
686                                 } else {
687                                 /* Unknown supplementary volume descriptor */
688                                 sec = NULL;
689                                 }
690                         }
691 #endif
692                 } else {
693                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
694                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
695                                         goto out_freebh;
696 
697                                 sbi->s_high_sierra = 1;
698                                 opt.rock = 0;
699                                 h_pri = (struct hs_primary_descriptor *)vdp;
700                                 goto root_found;
701                         }
702                 }
703 
704                 /* Just skip any volume descriptors we don't recognize */
705 
706                 brelse(bh);
707                 bh = NULL;
708         }
709         /*
710          * If we fall through, either no volume descriptor was found,
711          * or else we passed a primary descriptor looking for others.
712          */
713         if (!pri)
714                 goto out_unknown_format;
715         brelse(bh);
716         bh = pri_bh;
717         pri_bh = NULL;
718 
719 root_found:
720         /* We don't support read-write mounts */
721         if (!(s->s_flags & MS_RDONLY)) {
722                 error = -EACCES;
723                 goto out_freebh;
724         }
725 
726         if (joliet_level && (pri == NULL || !opt.rock)) {
727                 /* This is the case of Joliet with the norock mount flag.
728                  * A disc with both Joliet and Rock Ridge is handled later
729                  */
730                 pri = (struct iso_primary_descriptor *) sec;
731         }
732 
733         if(sbi->s_high_sierra){
734                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
735                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
736                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
737                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
738         } else {
739                 if (!pri)
740                         goto out_freebh;
741                 rootp = (struct iso_directory_record *) pri->root_directory_record;
742                 sbi->s_nzones = isonum_733(pri->volume_space_size);
743                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
744                 sbi->s_max_size = isonum_733(pri->volume_space_size);
745         }
746 
747         sbi->s_ninodes = 0; /* No way to figure this out easily */
748 
749         orig_zonesize = sbi->s_log_zone_size;
750         /*
751          * If the zone size is smaller than the hardware sector size,
752          * this is a fatal error.  This would occur if the disc drive
753          * had sectors that were 2048 bytes, but the filesystem had
754          * blocks that were 512 bytes (which should only very rarely
755          * happen.)
756          */
757         if (orig_zonesize < opt.blocksize)
758                 goto out_bad_size;
759 
760         /* RDE: convert log zone size to bit shift */
761         switch (sbi->s_log_zone_size) {
762         case  512: sbi->s_log_zone_size =  9; break;
763         case 1024: sbi->s_log_zone_size = 10; break;
764         case 2048: sbi->s_log_zone_size = 11; break;
765 
766         default:
767                 goto out_bad_zone_size;
768         }
769 
770         s->s_magic = ISOFS_SUPER_MAGIC;
771 
772         /*
773          * With multi-extent files, file size is only limited by the maximum
774          * size of a file system, which is 8 TB.
775          */
776         s->s_maxbytes = 0x80000000000LL;
777 
778         /* Set this for reference. Its not currently used except on write
779            which we don't have .. */
780 
781         first_data_zone = isonum_733(rootp->extent) +
782                           isonum_711(rootp->ext_attr_length);
783         sbi->s_firstdatazone = first_data_zone;
784 #ifndef BEQUIET
785         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
786                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
787         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
788         if(sbi->s_high_sierra)
789                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
790 #endif
791 
792         /*
793          * If the Joliet level is set, we _may_ decide to use the
794          * secondary descriptor, but can't be sure until after we
795          * read the root inode. But before reading the root inode
796          * we may need to change the device blocksize, and would
797          * rather release the old buffer first. So, we cache the
798          * first_data_zone value from the secondary descriptor.
799          */
800         if (joliet_level) {
801                 pri = (struct iso_primary_descriptor *) sec;
802                 rootp = (struct iso_directory_record *)
803                         pri->root_directory_record;
804                 first_data_zone = isonum_733(rootp->extent) +
805                                 isonum_711(rootp->ext_attr_length);
806         }
807 
808         /*
809          * We're all done using the volume descriptor, and may need
810          * to change the device blocksize, so release the buffer now.
811          */
812         brelse(pri_bh);
813         brelse(bh);
814 
815         /*
816          * Force the blocksize to 512 for 512 byte sectors.  The file
817          * read primitives really get it wrong in a bad way if we don't
818          * do this.
819          *
820          * Note - we should never be setting the blocksize to something
821          * less than the hardware sector size for the device.  If we
822          * do, we would end up having to read larger buffers and split
823          * out portions to satisfy requests.
824          *
825          * Note2- the idea here is that we want to deal with the optimal
826          * zonesize in the filesystem.  If we have it set to something less,
827          * then we have horrible problems with trying to piece together
828          * bits of adjacent blocks in order to properly read directory
829          * entries.  By forcing the blocksize in this way, we ensure
830          * that we will never be required to do this.
831          */
832         sb_set_blocksize(s, orig_zonesize);
833 
834         sbi->s_nls_iocharset = NULL;
835 
836 #ifdef CONFIG_JOLIET
837         if (joliet_level && opt.utf8 == 0) {
838                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
839                 sbi->s_nls_iocharset = load_nls(p);
840                 if (! sbi->s_nls_iocharset) {
841                         /* Fail only if explicit charset specified */
842                         if (opt.iocharset)
843                                 goto out_freesbi;
844                         sbi->s_nls_iocharset = load_nls_default();
845                 }
846         }
847 #endif
848         s->s_op = &isofs_sops;
849         s->s_export_op = &isofs_export_ops;
850         sbi->s_mapping = opt.map;
851         sbi->s_rock = (opt.rock ? 2 : 0);
852         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
853         sbi->s_cruft = opt.cruft;
854         sbi->s_hide = opt.hide;
855         sbi->s_showassoc = opt.showassoc;
856         sbi->s_uid = opt.uid;
857         sbi->s_gid = opt.gid;
858         sbi->s_uid_set = opt.uid_set;
859         sbi->s_gid_set = opt.gid_set;
860         sbi->s_utf8 = opt.utf8;
861         sbi->s_nocompress = opt.nocompress;
862         sbi->s_overriderockperm = opt.overriderockperm;
863         /*
864          * It would be incredibly stupid to allow people to mark every file
865          * on the disk as suid, so we merely allow them to set the default
866          * permissions.
867          */
868         if (opt.fmode != ISOFS_INVALID_MODE)
869                 sbi->s_fmode = opt.fmode & 0777;
870         else
871                 sbi->s_fmode = ISOFS_INVALID_MODE;
872         if (opt.dmode != ISOFS_INVALID_MODE)
873                 sbi->s_dmode = opt.dmode & 0777;
874         else
875                 sbi->s_dmode = ISOFS_INVALID_MODE;
876 
877         /*
878          * Read the root inode, which _may_ result in changing
879          * the s_rock flag. Once we have the final s_rock value,
880          * we then decide whether to use the Joliet descriptor.
881          */
882         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
883         if (IS_ERR(inode))
884                 goto out_no_root;
885 
886         /*
887          * Fix for broken CDs with Rock Ridge and empty ISO root directory but
888          * correct Joliet root directory.
889          */
890         if (sbi->s_rock == 1 && joliet_level &&
891                                 rootdir_empty(s, sbi->s_firstdatazone)) {
892                 printk(KERN_NOTICE
893                         "ISOFS: primary root directory is empty. "
894                         "Disabling Rock Ridge and switching to Joliet.");
895                 sbi->s_rock = 0;
896         }
897 
898         /*
899          * If this disk has both Rock Ridge and Joliet on it, then we
900          * want to use Rock Ridge by default.  This can be overridden
901          * by using the norock mount option.  There is still one other
902          * possibility that is not taken into account: a Rock Ridge
903          * CD with Unicode names.  Until someone sees such a beast, it
904          * will not be supported.
905          */
906         if (sbi->s_rock == 1) {
907                 joliet_level = 0;
908         } else if (joliet_level) {
909                 sbi->s_rock = 0;
910                 if (sbi->s_firstdatazone != first_data_zone) {
911                         sbi->s_firstdatazone = first_data_zone;
912                         printk(KERN_DEBUG
913                                 "ISOFS: changing to secondary root\n");
914                         iput(inode);
915                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
916                         if (IS_ERR(inode))
917                                 goto out_no_root;
918                 }
919         }
920 
921         if (opt.check == 'u') {
922                 /* Only Joliet is case insensitive by default */
923                 if (joliet_level)
924                         opt.check = 'r';
925                 else
926                         opt.check = 's';
927         }
928         sbi->s_joliet_level = joliet_level;
929 
930         /* Make sure the root inode is a directory */
931         if (!S_ISDIR(inode->i_mode)) {
932                 printk(KERN_WARNING
933                         "isofs_fill_super: root inode is not a directory. "
934                         "Corrupted media?\n");
935                 goto out_iput;
936         }
937 
938         table = 0;
939         if (joliet_level)
940                 table += 2;
941         if (opt.check == 'r')
942                 table++;
943 
944         s->s_d_op = &isofs_dentry_ops[table];
945 
946         /* get the root dentry */
947         s->s_root = d_alloc_root(inode);
948         if (!(s->s_root))
949                 goto out_no_root;
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 
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.val[0] = (u32)id;
1010         buf->f_fsid.val[1] = (u32)(id >> 32);
1011         buf->f_namelen = NAME_MAX;
1012         return 0;
1013 }
1014 
1015 /*
1016  * Get a set of blocks; filling in buffer_heads if already allocated
1017  * or getblk() if they are not.  Returns the number of blocks inserted
1018  * (-ve == error.)
1019  */
1020 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1021                      struct buffer_head **bh, unsigned long nblocks)
1022 {
1023         unsigned long b_off = iblock;
1024         unsigned offset, sect_size;
1025         unsigned int firstext;
1026         unsigned long nextblk, nextoff;
1027         int section, rv, error;
1028         struct iso_inode_info *ei = ISOFS_I(inode);
1029 
1030         error = -EIO;
1031         rv = 0;
1032         if (iblock != b_off) {
1033                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1034                 goto abort;
1035         }
1036 
1037 
1038         offset = 0;
1039         firstext = ei->i_first_extent;
1040         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1041         nextblk = ei->i_next_section_block;
1042         nextoff = ei->i_next_section_offset;
1043         section = 0;
1044 
1045         while (nblocks) {
1046                 /* If we are *way* beyond the end of the file, print a message.
1047                  * Access beyond the end of the file up to the next page boundary
1048                  * is normal, however because of the way the page cache works.
1049                  * In this case, we just return 0 so that we can properly fill
1050                  * the page with useless information without generating any
1051                  * I/O errors.
1052                  */
1053                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1054                         printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1055                                 __func__, b_off,
1056                                 (unsigned long long)inode->i_size);
1057                         goto abort;
1058                 }
1059 
1060                 /* On the last section, nextblk == 0, section size is likely to
1061                  * exceed sect_size by a partial block, and access beyond the
1062                  * end of the file will reach beyond the section size, too.
1063                  */
1064                 while (nextblk && (b_off >= (offset + sect_size))) {
1065                         struct inode *ninode;
1066 
1067                         offset += sect_size;
1068                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1069                         if (IS_ERR(ninode)) {
1070                                 error = PTR_ERR(ninode);
1071                                 goto abort;
1072                         }
1073                         firstext  = ISOFS_I(ninode)->i_first_extent;
1074                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1075                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1076                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1077                         iput(ninode);
1078 
1079                         if (++section > 100) {
1080                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1081                                         " aborting...\n", __func__);
1082                                 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1083                                         "nextblk=%lu nextoff=%lu\n", __func__,
1084                                         b_off, firstext, (unsigned) sect_size,
1085                                         nextblk, nextoff);
1086                                 goto abort;
1087                         }
1088                 }
1089 
1090                 if (*bh) {
1091                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1092                 } else {
1093                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1094                         if (!*bh)
1095                                 goto abort;
1096                 }
1097                 bh++;   /* Next buffer head */
1098                 b_off++;        /* Next buffer offset */
1099                 nblocks--;
1100                 rv++;
1101         }
1102 
1103         error = 0;
1104 abort:
1105         return rv != 0 ? rv : error;
1106 }
1107 
1108 /*
1109  * Used by the standard interfaces.
1110  */
1111 static int isofs_get_block(struct inode *inode, sector_t iblock,
1112                     struct buffer_head *bh_result, int create)
1113 {
1114         int ret;
1115 
1116         if (create) {
1117                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1118                 return -EROFS;
1119         }
1120 
1121         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1122         return ret < 0 ? ret : 0;
1123 }
1124 
1125 static int isofs_bmap(struct inode *inode, sector_t block)
1126 {
1127         struct buffer_head dummy;
1128         int error;
1129 
1130         dummy.b_state = 0;
1131         dummy.b_blocknr = -1000;
1132         error = isofs_get_block(inode, block, &dummy, 0);
1133         if (!error)
1134                 return dummy.b_blocknr;
1135         return 0;
1136 }
1137 
1138 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1139 {
1140         sector_t blknr = isofs_bmap(inode, block);
1141         if (!blknr)
1142                 return NULL;
1143         return sb_bread(inode->i_sb, blknr);
1144 }
1145 
1146 static int isofs_readpage(struct file *file, struct page *page)
1147 {
1148         return mpage_readpage(page, isofs_get_block);
1149 }
1150 
1151 static int isofs_readpages(struct file *file, struct address_space *mapping,
1152                         struct list_head *pages, unsigned nr_pages)
1153 {
1154         return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1155 }
1156 
1157 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1158 {
1159         return generic_block_bmap(mapping,block,isofs_get_block);
1160 }
1161 
1162 static const struct address_space_operations isofs_aops = {
1163         .readpage = isofs_readpage,
1164         .readpages = isofs_readpages,
1165         .bmap = _isofs_bmap
1166 };
1167 
1168 static int isofs_read_level3_size(struct inode *inode)
1169 {
1170         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1171         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1172         struct buffer_head *bh = NULL;
1173         unsigned long block, offset, block_saved, offset_saved;
1174         int i = 0;
1175         int more_entries = 0;
1176         struct iso_directory_record *tmpde = NULL;
1177         struct iso_inode_info *ei = ISOFS_I(inode);
1178 
1179         inode->i_size = 0;
1180 
1181         /* The first 16 blocks are reserved as the System Area.  Thus,
1182          * no inodes can appear in block 0.  We use this to flag that
1183          * this is the last section. */
1184         ei->i_next_section_block = 0;
1185         ei->i_next_section_offset = 0;
1186 
1187         block = ei->i_iget5_block;
1188         offset = ei->i_iget5_offset;
1189 
1190         do {
1191                 struct iso_directory_record *de;
1192                 unsigned int de_len;
1193 
1194                 if (!bh) {
1195                         bh = sb_bread(inode->i_sb, block);
1196                         if (!bh)
1197                                 goto out_noread;
1198                 }
1199                 de = (struct iso_directory_record *) (bh->b_data + offset);
1200                 de_len = *(unsigned char *) de;
1201 
1202                 if (de_len == 0) {
1203                         brelse(bh);
1204                         bh = NULL;
1205                         ++block;
1206                         offset = 0;
1207                         continue;
1208                 }
1209 
1210                 block_saved = block;
1211                 offset_saved = offset;
1212                 offset += de_len;
1213 
1214                 /* Make sure we have a full directory entry */
1215                 if (offset >= bufsize) {
1216                         int slop = bufsize - offset + de_len;
1217                         if (!tmpde) {
1218                                 tmpde = kmalloc(256, GFP_KERNEL);
1219                                 if (!tmpde)
1220                                         goto out_nomem;
1221                         }
1222                         memcpy(tmpde, de, slop);
1223                         offset &= bufsize - 1;
1224                         block++;
1225                         brelse(bh);
1226                         bh = NULL;
1227                         if (offset) {
1228                                 bh = sb_bread(inode->i_sb, block);
1229                                 if (!bh)
1230                                         goto out_noread;
1231                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1232                         }
1233                         de = tmpde;
1234                 }
1235 
1236                 inode->i_size += isonum_733(de->size);
1237                 if (i == 1) {
1238                         ei->i_next_section_block = block_saved;
1239                         ei->i_next_section_offset = offset_saved;
1240                 }
1241 
1242                 more_entries = de->flags[-high_sierra] & 0x80;
1243 
1244                 i++;
1245                 if (i > 100)
1246                         goto out_toomany;
1247         } while (more_entries);
1248 out:
1249         kfree(tmpde);
1250         if (bh)
1251                 brelse(bh);
1252         return 0;
1253 
1254 out_nomem:
1255         if (bh)
1256                 brelse(bh);
1257         return -ENOMEM;
1258 
1259 out_noread:
1260         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1261         kfree(tmpde);
1262         return -EIO;
1263 
1264 out_toomany:
1265         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1266                 "isofs_read_level3_size: inode=%lu\n",
1267                 __func__, inode->i_ino);
1268         goto out;
1269 }
1270 
1271 static int isofs_read_inode(struct inode *inode, int relocated)
1272 {
1273         struct super_block *sb = inode->i_sb;
1274         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1275         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1276         unsigned long block;
1277         int high_sierra = sbi->s_high_sierra;
1278         struct buffer_head *bh = NULL;
1279         struct iso_directory_record *de;
1280         struct iso_directory_record *tmpde = NULL;
1281         unsigned int de_len;
1282         unsigned long offset;
1283         struct iso_inode_info *ei = ISOFS_I(inode);
1284         int ret = -EIO;
1285 
1286         block = ei->i_iget5_block;
1287         bh = sb_bread(inode->i_sb, block);
1288         if (!bh)
1289                 goto out_badread;
1290 
1291         offset = ei->i_iget5_offset;
1292 
1293         de = (struct iso_directory_record *) (bh->b_data + offset);
1294         de_len = *(unsigned char *) de;
1295 
1296         if (offset + de_len > bufsize) {
1297                 int frag1 = bufsize - offset;
1298 
1299                 tmpde = kmalloc(de_len, GFP_KERNEL);
1300                 if (tmpde == NULL) {
1301                         printk(KERN_INFO "%s: out of memory\n", __func__);
1302                         ret = -ENOMEM;
1303                         goto fail;
1304                 }
1305                 memcpy(tmpde, bh->b_data + offset, frag1);
1306                 brelse(bh);
1307                 bh = sb_bread(inode->i_sb, ++block);
1308                 if (!bh)
1309                         goto out_badread;
1310                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1311                 de = tmpde;
1312         }
1313 
1314         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1315                                         ei->i_iget5_offset,
1316                                         ISOFS_BUFFER_BITS(inode));
1317 
1318         /* Assume it is a normal-format file unless told otherwise */
1319         ei->i_file_format = isofs_file_normal;
1320 
1321         if (de->flags[-high_sierra] & 2) {
1322                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1323                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1324                 else
1325                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1326                 set_nlink(inode, 1);    /*
1327                                          * Set to 1.  We know there are 2, but
1328                                          * the find utility tries to optimize
1329                                          * if it is 2, and it screws up.  It is
1330                                          * easier to give 1 which tells find to
1331                                          * do it the hard way.
1332                                          */
1333         } else {
1334                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1335                         inode->i_mode = S_IFREG | sbi->s_fmode;
1336                 } else {
1337                         /*
1338                          * Set default permissions: r-x for all.  The disc
1339                          * could be shared with DOS machines so virtually
1340                          * anything could be a valid executable.
1341                          */
1342                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1343                 }
1344                 set_nlink(inode, 1);
1345         }
1346         inode->i_uid = sbi->s_uid;
1347         inode->i_gid = sbi->s_gid;
1348         inode->i_blocks = 0;
1349 
1350         ei->i_format_parm[0] = 0;
1351         ei->i_format_parm[1] = 0;
1352         ei->i_format_parm[2] = 0;
1353 
1354         ei->i_section_size = isonum_733(de->size);
1355         if (de->flags[-high_sierra] & 0x80) {
1356                 ret = isofs_read_level3_size(inode);
1357                 if (ret < 0)
1358                         goto fail;
1359                 ret = -EIO;
1360         } else {
1361                 ei->i_next_section_block = 0;
1362                 ei->i_next_section_offset = 0;
1363                 inode->i_size = isonum_733(de->size);
1364         }
1365 
1366         /*
1367          * Some dipshit decided to store some other bit of information
1368          * in the high byte of the file length.  Truncate size in case
1369          * this CDROM was mounted with the cruft option.
1370          */
1371 
1372         if (sbi->s_cruft)
1373                 inode->i_size &= 0x00ffffff;
1374 
1375         if (de->interleave[0]) {
1376                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1377                 inode->i_size = 0;
1378         }
1379 
1380         /* I have no idea what file_unit_size is used for, so
1381            we will flag it for now */
1382         if (de->file_unit_size[0] != 0) {
1383                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1384                         inode->i_ino);
1385         }
1386 
1387         /* I have no idea what other flag bits are used for, so
1388            we will flag it for now */
1389 #ifdef DEBUG
1390         if((de->flags[-high_sierra] & ~2)!= 0){
1391                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1392                                 "(%ld %x).\n",
1393                         inode->i_ino, de->flags[-high_sierra]);
1394         }
1395 #endif
1396 
1397         inode->i_mtime.tv_sec =
1398         inode->i_atime.tv_sec =
1399         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1400         inode->i_mtime.tv_nsec =
1401         inode->i_atime.tv_nsec =
1402         inode->i_ctime.tv_nsec = 0;
1403 
1404         ei->i_first_extent = (isonum_733(de->extent) +
1405                         isonum_711(de->ext_attr_length));
1406 
1407         /* Set the number of blocks for stat() - should be done before RR */
1408         inode->i_blocks = (inode->i_size + 511) >> 9;
1409 
1410         /*
1411          * Now test for possible Rock Ridge extensions which will override
1412          * some of these numbers in the inode structure.
1413          */
1414 
1415         if (!high_sierra) {
1416                 parse_rock_ridge_inode(de, inode, relocated);
1417                 /* if we want uid/gid set, override the rock ridge setting */
1418                 if (sbi->s_uid_set)
1419                         inode->i_uid = sbi->s_uid;
1420                 if (sbi->s_gid_set)
1421                         inode->i_gid = sbi->s_gid;
1422         }
1423         /* Now set final access rights if overriding rock ridge setting */
1424         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1425             sbi->s_dmode != ISOFS_INVALID_MODE)
1426                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1427         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1428             sbi->s_fmode != ISOFS_INVALID_MODE)
1429                 inode->i_mode = S_IFREG | sbi->s_fmode;
1430 
1431         /* Install the inode operations vector */
1432         if (S_ISREG(inode->i_mode)) {
1433                 inode->i_fop = &generic_ro_fops;
1434                 switch (ei->i_file_format) {
1435 #ifdef CONFIG_ZISOFS
1436                 case isofs_file_compressed:
1437                         inode->i_data.a_ops = &zisofs_aops;
1438                         break;
1439 #endif
1440                 default:
1441                         inode->i_data.a_ops = &isofs_aops;
1442                         break;
1443                 }
1444         } else if (S_ISDIR(inode->i_mode)) {
1445                 inode->i_op = &isofs_dir_inode_operations;
1446                 inode->i_fop = &isofs_dir_operations;
1447         } else if (S_ISLNK(inode->i_mode)) {
1448                 inode->i_op = &page_symlink_inode_operations;
1449                 inode->i_data.a_ops = &isofs_symlink_aops;
1450         } else
1451                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1452                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1453 
1454         ret = 0;
1455 out:
1456         kfree(tmpde);
1457         if (bh)
1458                 brelse(bh);
1459         return ret;
1460 
1461 out_badread:
1462         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1463 fail:
1464         goto out;
1465 }
1466 
1467 struct isofs_iget5_callback_data {
1468         unsigned long block;
1469         unsigned long offset;
1470 };
1471 
1472 static int isofs_iget5_test(struct inode *ino, void *data)
1473 {
1474         struct iso_inode_info *i = ISOFS_I(ino);
1475         struct isofs_iget5_callback_data *d =
1476                 (struct isofs_iget5_callback_data*)data;
1477         return (i->i_iget5_block == d->block)
1478                 && (i->i_iget5_offset == d->offset);
1479 }
1480 
1481 static int isofs_iget5_set(struct inode *ino, void *data)
1482 {
1483         struct iso_inode_info *i = ISOFS_I(ino);
1484         struct isofs_iget5_callback_data *d =
1485                 (struct isofs_iget5_callback_data*)data;
1486         i->i_iget5_block = d->block;
1487         i->i_iget5_offset = d->offset;
1488         return 0;
1489 }
1490 
1491 /* Store, in the inode's containing structure, the block and block
1492  * offset that point to the underlying meta-data for the inode.  The
1493  * code below is otherwise similar to the iget() code in
1494  * include/linux/fs.h */
1495 struct inode *__isofs_iget(struct super_block *sb,
1496                            unsigned long block,
1497                            unsigned long offset,
1498                            int relocated)
1499 {
1500         unsigned long hashval;
1501         struct inode *inode;
1502         struct isofs_iget5_callback_data data;
1503         long ret;
1504 
1505         if (offset >= 1ul << sb->s_blocksize_bits)
1506                 return ERR_PTR(-EINVAL);
1507 
1508         data.block = block;
1509         data.offset = offset;
1510 
1511         hashval = (block << sb->s_blocksize_bits) | offset;
1512 
1513         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1514                                 &isofs_iget5_set, &data);
1515 
1516         if (!inode)
1517                 return ERR_PTR(-ENOMEM);
1518 
1519         if (inode->i_state & I_NEW) {
1520                 ret = isofs_read_inode(inode, relocated);
1521                 if (ret < 0) {
1522                         iget_failed(inode);
1523                         inode = ERR_PTR(ret);
1524                 } else {
1525                         unlock_new_inode(inode);
1526                 }
1527         }
1528 
1529         return inode;
1530 }
1531 
1532 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1533         int flags, const char *dev_name, void *data)
1534 {
1535         return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1536 }
1537 
1538 static struct file_system_type iso9660_fs_type = {
1539         .owner          = THIS_MODULE,
1540         .name           = "iso9660",
1541         .mount          = isofs_mount,
1542         .kill_sb        = kill_block_super,
1543         .fs_flags       = FS_REQUIRES_DEV,
1544 };
1545 
1546 static int __init init_iso9660_fs(void)
1547 {
1548         int err = init_inodecache();
1549         if (err)
1550                 goto out;
1551 #ifdef CONFIG_ZISOFS
1552         err = zisofs_init();
1553         if (err)
1554                 goto out1;
1555 #endif
1556         err = register_filesystem(&iso9660_fs_type);
1557         if (err)
1558                 goto out2;
1559         return 0;
1560 out2:
1561 #ifdef CONFIG_ZISOFS
1562         zisofs_cleanup();
1563 out1:
1564 #endif
1565         destroy_inodecache();
1566 out:
1567         return err;
1568 }
1569 
1570 static void __exit exit_iso9660_fs(void)
1571 {
1572         unregister_filesystem(&iso9660_fs_type);
1573 #ifdef CONFIG_ZISOFS
1574         zisofs_cleanup();
1575 #endif
1576         destroy_inodecache();
1577 }
1578 
1579 module_init(init_iso9660_fs)
1580 module_exit(exit_iso9660_fs)
1581 MODULE_LICENSE("GPL");
1582 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1583 MODULE_ALIAS("iso9660");
1584 

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