Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

Linux/fs/isofs/inode.c

  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 #include <linux/user_namespace.h>
 25 
 26 #include "isofs.h"
 27 #include "zisofs.h"
 28 
 29 #define BEQUIET
 30 
 31 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
 32 static int isofs_dentry_cmpi(const struct dentry *dentry,
 33                 unsigned int len, const char *str, const struct qstr *name);
 34 
 35 #ifdef CONFIG_JOLIET
 36 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
 37 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
 38 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
 39                 unsigned int len, const char *str, const struct qstr *name);
 40 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
 41                 unsigned int len, const char *str, const struct qstr *name);
 42 #endif
 43 
 44 static void isofs_put_super(struct super_block *sb)
 45 {
 46         struct isofs_sb_info *sbi = ISOFS_SB(sb);
 47 
 48 #ifdef CONFIG_JOLIET
 49         unload_nls(sbi->s_nls_iocharset);
 50 #endif
 51 
 52         kfree(sbi);
 53         sb->s_fs_info = NULL;
 54         return;
 55 }
 56 
 57 static int isofs_read_inode(struct inode *, int relocated);
 58 static int isofs_statfs (struct dentry *, struct kstatfs *);
 59 
 60 static struct kmem_cache *isofs_inode_cachep;
 61 
 62 static struct inode *isofs_alloc_inode(struct super_block *sb)
 63 {
 64         struct iso_inode_info *ei;
 65         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
 66         if (!ei)
 67                 return NULL;
 68         return &ei->vfs_inode;
 69 }
 70 
 71 static void isofs_i_callback(struct rcu_head *head)
 72 {
 73         struct inode *inode = container_of(head, struct inode, i_rcu);
 74         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
 75 }
 76 
 77 static void isofs_destroy_inode(struct inode *inode)
 78 {
 79         call_rcu(&inode->i_rcu, isofs_i_callback);
 80 }
 81 
 82 static void init_once(void *foo)
 83 {
 84         struct iso_inode_info *ei = foo;
 85 
 86         inode_init_once(&ei->vfs_inode);
 87 }
 88 
 89 static int __init init_inodecache(void)
 90 {
 91         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
 92                                         sizeof(struct iso_inode_info),
 93                                         0, (SLAB_RECLAIM_ACCOUNT|
 94                                         SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 95                                         init_once);
 96         if (isofs_inode_cachep == NULL)
 97                 return -ENOMEM;
 98         return 0;
 99 }
100 
101 static void destroy_inodecache(void)
102 {
103         /*
104          * Make sure all delayed rcu free inodes are flushed before we
105          * destroy cache.
106          */
107         rcu_barrier();
108         kmem_cache_destroy(isofs_inode_cachep);
109 }
110 
111 static int isofs_remount(struct super_block *sb, int *flags, char *data)
112 {
113         sync_filesystem(sb);
114         if (!(*flags & MS_RDONLY))
115                 return -EROFS;
116         return 0;
117 }
118 
119 static const struct super_operations isofs_sops = {
120         .alloc_inode    = isofs_alloc_inode,
121         .destroy_inode  = isofs_destroy_inode,
122         .put_super      = isofs_put_super,
123         .statfs         = isofs_statfs,
124         .remount_fs     = isofs_remount,
125         .show_options   = generic_show_options,
126 };
127 
128 
129 static const struct dentry_operations isofs_dentry_ops[] = {
130         {
131                 .d_hash         = isofs_hashi,
132                 .d_compare      = isofs_dentry_cmpi,
133         },
134 #ifdef CONFIG_JOLIET
135         {
136                 .d_hash         = isofs_hash_ms,
137                 .d_compare      = isofs_dentry_cmp_ms,
138         },
139         {
140                 .d_hash         = isofs_hashi_ms,
141                 .d_compare      = isofs_dentry_cmpi_ms,
142         },
143 #endif
144 };
145 
146 struct iso9660_options{
147         unsigned int rock:1;
148         unsigned int joliet:1;
149         unsigned int cruft:1;
150         unsigned int hide:1;
151         unsigned int showassoc:1;
152         unsigned int nocompress:1;
153         unsigned int overriderockperm:1;
154         unsigned int uid_set:1;
155         unsigned int gid_set:1;
156         unsigned int utf8:1;
157         unsigned char map;
158         unsigned char check;
159         unsigned int blocksize;
160         umode_t fmode;
161         umode_t dmode;
162         kgid_t gid;
163         kuid_t uid;
164         char *iocharset;
165         /* LVE */
166         s32 session;
167         s32 sbsector;
168 };
169 
170 /*
171  * Compute the hash for the isofs name corresponding to the dentry.
172  */
173 static int
174 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
175 {
176         const char *name;
177         int len;
178         char c;
179         unsigned long hash;
180 
181         len = qstr->len;
182         name = qstr->name;
183         if (ms) {
184                 while (len && name[len-1] == '.')
185                         len--;
186         }
187 
188         hash = init_name_hash(dentry);
189         while (len--) {
190                 c = tolower(*name++);
191                 hash = partial_name_hash(c, hash);
192         }
193         qstr->hash = end_name_hash(hash);
194 
195         return 0;
196 }
197 
198 /*
199  * Compare of two isofs names.
200  */
201 static int isofs_dentry_cmp_common(
202                 unsigned int len, const char *str,
203                 const struct qstr *name, int ms, int ci)
204 {
205         int alen, blen;
206 
207         /* A filename cannot end in '.' or we treat it like it has none */
208         alen = name->len;
209         blen = len;
210         if (ms) {
211                 while (alen && name->name[alen-1] == '.')
212                         alen--;
213                 while (blen && str[blen-1] == '.')
214                         blen--;
215         }
216         if (alen == blen) {
217                 if (ci) {
218                         if (strncasecmp(name->name, str, alen) == 0)
219                                 return 0;
220                 } else {
221                         if (strncmp(name->name, str, alen) == 0)
222                                 return 0;
223                 }
224         }
225         return 1;
226 }
227 
228 static int
229 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
230 {
231         return isofs_hashi_common(dentry, qstr, 0);
232 }
233 
234 static int
235 isofs_dentry_cmpi(const struct dentry *dentry,
236                 unsigned int len, const char *str, const struct qstr *name)
237 {
238         return isofs_dentry_cmp_common(len, str, name, 0, 1);
239 }
240 
241 #ifdef CONFIG_JOLIET
242 /*
243  * Compute the hash for the isofs name corresponding to the dentry.
244  */
245 static int
246 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
247 {
248         const char *name;
249         int len;
250 
251         len = qstr->len;
252         name = qstr->name;
253         if (ms) {
254                 while (len && name[len-1] == '.')
255                         len--;
256         }
257 
258         qstr->hash = full_name_hash(dentry, name, len);
259 
260         return 0;
261 }
262 
263 static int
264 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
265 {
266         return isofs_hash_common(dentry, qstr, 1);
267 }
268 
269 static int
270 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
271 {
272         return isofs_hashi_common(dentry, qstr, 1);
273 }
274 
275 static int
276 isofs_dentry_cmp_ms(const struct dentry *dentry,
277                 unsigned int len, const char *str, const struct qstr *name)
278 {
279         return isofs_dentry_cmp_common(len, str, name, 1, 0);
280 }
281 
282 static int
283 isofs_dentry_cmpi_ms(const struct dentry *dentry,
284                 unsigned int len, const char *str, const struct qstr *name)
285 {
286         return isofs_dentry_cmp_common(len, str, name, 1, 1);
287 }
288 #endif
289 
290 enum {
291         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
292         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
293         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
294         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
295 };
296 
297 static const match_table_t tokens = {
298         {Opt_norock, "norock"},
299         {Opt_nojoliet, "nojoliet"},
300         {Opt_unhide, "unhide"},
301         {Opt_hide, "hide"},
302         {Opt_showassoc, "showassoc"},
303         {Opt_cruft, "cruft"},
304         {Opt_utf8, "utf8"},
305         {Opt_iocharset, "iocharset=%s"},
306         {Opt_map_a, "map=acorn"},
307         {Opt_map_a, "map=a"},
308         {Opt_map_n, "map=normal"},
309         {Opt_map_n, "map=n"},
310         {Opt_map_o, "map=off"},
311         {Opt_map_o, "map=o"},
312         {Opt_session, "session=%u"},
313         {Opt_sb, "sbsector=%u"},
314         {Opt_check_r, "check=relaxed"},
315         {Opt_check_r, "check=r"},
316         {Opt_check_s, "check=strict"},
317         {Opt_check_s, "check=s"},
318         {Opt_uid, "uid=%u"},
319         {Opt_gid, "gid=%u"},
320         {Opt_mode, "mode=%u"},
321         {Opt_dmode, "dmode=%u"},
322         {Opt_overriderockperm, "overriderockperm"},
323         {Opt_block, "block=%u"},
324         {Opt_ignore, "conv=binary"},
325         {Opt_ignore, "conv=b"},
326         {Opt_ignore, "conv=text"},
327         {Opt_ignore, "conv=t"},
328         {Opt_ignore, "conv=mtext"},
329         {Opt_ignore, "conv=m"},
330         {Opt_ignore, "conv=auto"},
331         {Opt_ignore, "conv=a"},
332         {Opt_nocompress, "nocompress"},
333         {Opt_err, NULL}
334 };
335 
336 static int parse_options(char *options, struct iso9660_options *popt)
337 {
338         char *p;
339         int option;
340 
341         popt->map = 'n';
342         popt->rock = 1;
343         popt->joliet = 1;
344         popt->cruft = 0;
345         popt->hide = 0;
346         popt->showassoc = 0;
347         popt->check = 'u';              /* unset */
348         popt->nocompress = 0;
349         popt->blocksize = 1024;
350         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
351         popt->uid_set = 0;
352         popt->gid_set = 0;
353         popt->gid = GLOBAL_ROOT_GID;
354         popt->uid = GLOBAL_ROOT_UID;
355         popt->iocharset = NULL;
356         popt->utf8 = 0;
357         popt->overriderockperm = 0;
358         popt->session=-1;
359         popt->sbsector=-1;
360         if (!options)
361                 return 1;
362 
363         while ((p = strsep(&options, ",")) != NULL) {
364                 int token;
365                 substring_t args[MAX_OPT_ARGS];
366                 unsigned n;
367 
368                 if (!*p)
369                         continue;
370 
371                 token = match_token(p, tokens, args);
372                 switch (token) {
373                 case Opt_norock:
374                         popt->rock = 0;
375                         break;
376                 case Opt_nojoliet:
377                         popt->joliet = 0;
378                         break;
379                 case Opt_hide:
380                         popt->hide = 1;
381                         break;
382                 case Opt_unhide:
383                 case Opt_showassoc:
384                         popt->showassoc = 1;
385                         break;
386                 case Opt_cruft:
387                         popt->cruft = 1;
388                         break;
389                 case Opt_utf8:
390                         popt->utf8 = 1;
391                         break;
392 #ifdef CONFIG_JOLIET
393                 case Opt_iocharset:
394                         popt->iocharset = match_strdup(&args[0]);
395                         break;
396 #endif
397                 case Opt_map_a:
398                         popt->map = 'a';
399                         break;
400                 case Opt_map_o:
401                         popt->map = 'o';
402                         break;
403                 case Opt_map_n:
404                         popt->map = 'n';
405                         break;
406                 case Opt_session:
407                         if (match_int(&args[0], &option))
408                                 return 0;
409                         n = option;
410                         if (n > 99)
411                                 return 0;
412                         popt->session = n + 1;
413                         break;
414                 case Opt_sb:
415                         if (match_int(&args[0], &option))
416                                 return 0;
417                         popt->sbsector = option;
418                         break;
419                 case Opt_check_r:
420                         popt->check = 'r';
421                         break;
422                 case Opt_check_s:
423                         popt->check = 's';
424                         break;
425                 case Opt_ignore:
426                         break;
427                 case Opt_uid:
428                         if (match_int(&args[0], &option))
429                                 return 0;
430                         popt->uid = make_kuid(current_user_ns(), option);
431                         if (!uid_valid(popt->uid))
432                                 return 0;
433                         popt->uid_set = 1;
434                         break;
435                 case Opt_gid:
436                         if (match_int(&args[0], &option))
437                                 return 0;
438                         popt->gid = make_kgid(current_user_ns(), option);
439                         if (!gid_valid(popt->gid))
440                                 return 0;
441                         popt->gid_set = 1;
442                         break;
443                 case Opt_mode:
444                         if (match_int(&args[0], &option))
445                                 return 0;
446                         popt->fmode = option;
447                         break;
448                 case Opt_dmode:
449                         if (match_int(&args[0], &option))
450                                 return 0;
451                         popt->dmode = option;
452                         break;
453                 case Opt_overriderockperm:
454                         popt->overriderockperm = 1;
455                         break;
456                 case Opt_block:
457                         if (match_int(&args[0], &option))
458                                 return 0;
459                         n = option;
460                         if (n != 512 && n != 1024 && n != 2048)
461                                 return 0;
462                         popt->blocksize = n;
463                         break;
464                 case Opt_nocompress:
465                         popt->nocompress = 1;
466                         break;
467                 default:
468                         return 0;
469                 }
470         }
471         return 1;
472 }
473 
474 /*
475  * look if the driver can tell the multi session redirection value
476  *
477  * don't change this if you don't know what you do, please!
478  * Multisession is legal only with XA disks.
479  * A non-XA disk with more than one volume descriptor may do it right, but
480  * usually is written in a nowhere standardized "multi-partition" manner.
481  * Multisession uses absolute addressing (solely the first frame of the whole
482  * track is #0), multi-partition uses relative addressing (each first frame of
483  * each track is #0), and a track is not a session.
484  *
485  * A broken CDwriter software or drive firmware does not set new standards,
486  * at least not if conflicting with the existing ones.
487  *
488  * emoenke@gwdg.de
489  */
490 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
491 
492 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
493 {
494         struct cdrom_multisession ms_info;
495         unsigned int vol_desc_start;
496         struct block_device *bdev = sb->s_bdev;
497         int i;
498 
499         vol_desc_start=0;
500         ms_info.addr_format=CDROM_LBA;
501         if(session >= 0 && session <= 99) {
502                 struct cdrom_tocentry Te;
503                 Te.cdte_track=session;
504                 Te.cdte_format=CDROM_LBA;
505                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
506                 if (!i) {
507                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
508                                 session, Te.cdte_addr.lba,
509                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
510                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
511                                 return Te.cdte_addr.lba;
512                 }
513 
514                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
515         }
516         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
517         if (session > 0)
518                 printk(KERN_ERR "ISOFS: Invalid session number\n");
519 #if 0
520         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
521         if (i==0) {
522                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
523                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
524         }
525 #endif
526         if (i==0)
527 #if WE_OBEY_THE_WRITTEN_STANDARDS
528                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
529 #endif
530                         vol_desc_start=ms_info.addr.lba;
531         return vol_desc_start;
532 }
533 
534 /*
535  * Check if root directory is empty (has less than 3 files).
536  *
537  * Used to detect broken CDs where ISO root directory is empty but Joliet root
538  * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
539  * (and Joliet used instead) or else no files would be visible.
540  */
541 static bool rootdir_empty(struct super_block *sb, unsigned long block)
542 {
543         int offset = 0, files = 0, de_len;
544         struct iso_directory_record *de;
545         struct buffer_head *bh;
546 
547         bh = sb_bread(sb, block);
548         if (!bh)
549                 return true;
550         while (files < 3) {
551                 de = (struct iso_directory_record *) (bh->b_data + offset);
552                 de_len = *(unsigned char *) de;
553                 if (de_len == 0)
554                         break;
555                 files++;
556                 offset += de_len;
557         }
558         brelse(bh);
559         return files < 3;
560 }
561 
562 /*
563  * Initialize the superblock and read the root inode.
564  *
565  * Note: a check_disk_change() has been done immediately prior
566  * to this call, so we don't need to check again.
567  */
568 static int isofs_fill_super(struct super_block *s, void *data, int silent)
569 {
570         struct buffer_head *bh = NULL, *pri_bh = NULL;
571         struct hs_primary_descriptor *h_pri = NULL;
572         struct iso_primary_descriptor *pri = NULL;
573         struct iso_supplementary_descriptor *sec = NULL;
574         struct iso_directory_record *rootp;
575         struct inode *inode;
576         struct iso9660_options opt;
577         struct isofs_sb_info *sbi;
578         unsigned long first_data_zone;
579         int joliet_level = 0;
580         int iso_blknum, block;
581         int orig_zonesize;
582         int table, error = -EINVAL;
583         unsigned int vol_desc_start;
584 
585         save_mount_options(s, data);
586 
587         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
588         if (!sbi)
589                 return -ENOMEM;
590         s->s_fs_info = sbi;
591 
592         if (!parse_options((char *)data, &opt))
593                 goto out_freesbi;
594 
595         /*
596          * First of all, get the hardware blocksize for this device.
597          * If we don't know what it is, or the hardware blocksize is
598          * larger than the blocksize the user specified, then use
599          * that value.
600          */
601         /*
602          * What if bugger tells us to go beyond page size?
603          */
604         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
605 
606         sbi->s_high_sierra = 0; /* default is iso9660 */
607 
608         vol_desc_start = (opt.sbsector != -1) ?
609                 opt.sbsector : isofs_get_last_session(s,opt.session);
610 
611         for (iso_blknum = vol_desc_start+16;
612                 iso_blknum < vol_desc_start+100; iso_blknum++) {
613                 struct hs_volume_descriptor *hdp;
614                 struct iso_volume_descriptor  *vdp;
615 
616                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
617                 if (!(bh = sb_bread(s, block)))
618                         goto out_no_read;
619 
620                 vdp = (struct iso_volume_descriptor *)bh->b_data;
621                 hdp = (struct hs_volume_descriptor *)bh->b_data;
622 
623                 /*
624                  * Due to the overlapping physical location of the descriptors,
625                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
626                  * proper identification in this case, we first check for ISO.
627                  */
628                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
629                         if (isonum_711(vdp->type) == ISO_VD_END)
630                                 break;
631                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
632                                 if (pri == NULL) {
633                                         pri = (struct iso_primary_descriptor *)vdp;
634                                         /* Save the buffer in case we need it ... */
635                                         pri_bh = bh;
636                                         bh = NULL;
637                                 }
638                         }
639 #ifdef CONFIG_JOLIET
640                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
641                                 sec = (struct iso_supplementary_descriptor *)vdp;
642                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
643                                         if (opt.joliet) {
644                                                 if (sec->escape[2] == 0x40)
645                                                         joliet_level = 1;
646                                                 else if (sec->escape[2] == 0x43)
647                                                         joliet_level = 2;
648                                                 else if (sec->escape[2] == 0x45)
649                                                         joliet_level = 3;
650 
651                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
652                                                         "Microsoft Joliet Level %d\n",
653                                                         joliet_level);
654                                         }
655                                         goto root_found;
656                                 } else {
657                                 /* Unknown supplementary volume descriptor */
658                                 sec = NULL;
659                                 }
660                         }
661 #endif
662                 } else {
663                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
664                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
665                                         goto out_freebh;
666 
667                                 sbi->s_high_sierra = 1;
668                                 opt.rock = 0;
669                                 h_pri = (struct hs_primary_descriptor *)vdp;
670                                 goto root_found;
671                         }
672                 }
673 
674                 /* Just skip any volume descriptors we don't recognize */
675 
676                 brelse(bh);
677                 bh = NULL;
678         }
679         /*
680          * If we fall through, either no volume descriptor was found,
681          * or else we passed a primary descriptor looking for others.
682          */
683         if (!pri)
684                 goto out_unknown_format;
685         brelse(bh);
686         bh = pri_bh;
687         pri_bh = NULL;
688 
689 root_found:
690         /* We don't support read-write mounts */
691         if (!(s->s_flags & MS_RDONLY)) {
692                 error = -EACCES;
693                 goto out_freebh;
694         }
695 
696         if (joliet_level && (pri == NULL || !opt.rock)) {
697                 /* This is the case of Joliet with the norock mount flag.
698                  * A disc with both Joliet and Rock Ridge is handled later
699                  */
700                 pri = (struct iso_primary_descriptor *) sec;
701         }
702 
703         if(sbi->s_high_sierra){
704                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
705                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
706                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
707                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
708         } else {
709                 if (!pri)
710                         goto out_freebh;
711                 rootp = (struct iso_directory_record *) pri->root_directory_record;
712                 sbi->s_nzones = isonum_733(pri->volume_space_size);
713                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
714                 sbi->s_max_size = isonum_733(pri->volume_space_size);
715         }
716 
717         sbi->s_ninodes = 0; /* No way to figure this out easily */
718 
719         orig_zonesize = sbi->s_log_zone_size;
720         /*
721          * If the zone size is smaller than the hardware sector size,
722          * this is a fatal error.  This would occur if the disc drive
723          * had sectors that were 2048 bytes, but the filesystem had
724          * blocks that were 512 bytes (which should only very rarely
725          * happen.)
726          */
727         if (orig_zonesize < opt.blocksize)
728                 goto out_bad_size;
729 
730         /* RDE: convert log zone size to bit shift */
731         switch (sbi->s_log_zone_size) {
732         case  512: sbi->s_log_zone_size =  9; break;
733         case 1024: sbi->s_log_zone_size = 10; break;
734         case 2048: sbi->s_log_zone_size = 11; break;
735 
736         default:
737                 goto out_bad_zone_size;
738         }
739 
740         s->s_magic = ISOFS_SUPER_MAGIC;
741 
742         /*
743          * With multi-extent files, file size is only limited by the maximum
744          * size of a file system, which is 8 TB.
745          */
746         s->s_maxbytes = 0x80000000000LL;
747 
748         /* Set this for reference. Its not currently used except on write
749            which we don't have .. */
750 
751         first_data_zone = isonum_733(rootp->extent) +
752                           isonum_711(rootp->ext_attr_length);
753         sbi->s_firstdatazone = first_data_zone;
754 #ifndef BEQUIET
755         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
756                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
757         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
758         if(sbi->s_high_sierra)
759                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
760 #endif
761 
762         /*
763          * If the Joliet level is set, we _may_ decide to use the
764          * secondary descriptor, but can't be sure until after we
765          * read the root inode. But before reading the root inode
766          * we may need to change the device blocksize, and would
767          * rather release the old buffer first. So, we cache the
768          * first_data_zone value from the secondary descriptor.
769          */
770         if (joliet_level) {
771                 pri = (struct iso_primary_descriptor *) sec;
772                 rootp = (struct iso_directory_record *)
773                         pri->root_directory_record;
774                 first_data_zone = isonum_733(rootp->extent) +
775                                 isonum_711(rootp->ext_attr_length);
776         }
777 
778         /*
779          * We're all done using the volume descriptor, and may need
780          * to change the device blocksize, so release the buffer now.
781          */
782         brelse(pri_bh);
783         brelse(bh);
784 
785         /*
786          * Force the blocksize to 512 for 512 byte sectors.  The file
787          * read primitives really get it wrong in a bad way if we don't
788          * do this.
789          *
790          * Note - we should never be setting the blocksize to something
791          * less than the hardware sector size for the device.  If we
792          * do, we would end up having to read larger buffers and split
793          * out portions to satisfy requests.
794          *
795          * Note2- the idea here is that we want to deal with the optimal
796          * zonesize in the filesystem.  If we have it set to something less,
797          * then we have horrible problems with trying to piece together
798          * bits of adjacent blocks in order to properly read directory
799          * entries.  By forcing the blocksize in this way, we ensure
800          * that we will never be required to do this.
801          */
802         sb_set_blocksize(s, orig_zonesize);
803 
804         sbi->s_nls_iocharset = NULL;
805 
806 #ifdef CONFIG_JOLIET
807         if (joliet_level && opt.utf8 == 0) {
808                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
809                 sbi->s_nls_iocharset = load_nls(p);
810                 if (! sbi->s_nls_iocharset) {
811                         /* Fail only if explicit charset specified */
812                         if (opt.iocharset)
813                                 goto out_freesbi;
814                         sbi->s_nls_iocharset = load_nls_default();
815                 }
816         }
817 #endif
818         s->s_op = &isofs_sops;
819         s->s_export_op = &isofs_export_ops;
820         sbi->s_mapping = opt.map;
821         sbi->s_rock = (opt.rock ? 2 : 0);
822         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
823         sbi->s_cruft = opt.cruft;
824         sbi->s_hide = opt.hide;
825         sbi->s_showassoc = opt.showassoc;
826         sbi->s_uid = opt.uid;
827         sbi->s_gid = opt.gid;
828         sbi->s_uid_set = opt.uid_set;
829         sbi->s_gid_set = opt.gid_set;
830         sbi->s_utf8 = opt.utf8;
831         sbi->s_nocompress = opt.nocompress;
832         sbi->s_overriderockperm = opt.overriderockperm;
833         /*
834          * It would be incredibly stupid to allow people to mark every file
835          * on the disk as suid, so we merely allow them to set the default
836          * permissions.
837          */
838         if (opt.fmode != ISOFS_INVALID_MODE)
839                 sbi->s_fmode = opt.fmode & 0777;
840         else
841                 sbi->s_fmode = ISOFS_INVALID_MODE;
842         if (opt.dmode != ISOFS_INVALID_MODE)
843                 sbi->s_dmode = opt.dmode & 0777;
844         else
845                 sbi->s_dmode = ISOFS_INVALID_MODE;
846 
847         /*
848          * Read the root inode, which _may_ result in changing
849          * the s_rock flag. Once we have the final s_rock value,
850          * we then decide whether to use the Joliet descriptor.
851          */
852         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
853         if (IS_ERR(inode))
854                 goto out_no_root;
855 
856         /*
857          * Fix for broken CDs with Rock Ridge and empty ISO root directory but
858          * correct Joliet root directory.
859          */
860         if (sbi->s_rock == 1 && joliet_level &&
861                                 rootdir_empty(s, sbi->s_firstdatazone)) {
862                 printk(KERN_NOTICE
863                         "ISOFS: primary root directory is empty. "
864                         "Disabling Rock Ridge and switching to Joliet.");
865                 sbi->s_rock = 0;
866         }
867 
868         /*
869          * If this disk has both Rock Ridge and Joliet on it, then we
870          * want to use Rock Ridge by default.  This can be overridden
871          * by using the norock mount option.  There is still one other
872          * possibility that is not taken into account: a Rock Ridge
873          * CD with Unicode names.  Until someone sees such a beast, it
874          * will not be supported.
875          */
876         if (sbi->s_rock == 1) {
877                 joliet_level = 0;
878         } else if (joliet_level) {
879                 sbi->s_rock = 0;
880                 if (sbi->s_firstdatazone != first_data_zone) {
881                         sbi->s_firstdatazone = first_data_zone;
882                         printk(KERN_DEBUG
883                                 "ISOFS: changing to secondary root\n");
884                         iput(inode);
885                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
886                         if (IS_ERR(inode))
887                                 goto out_no_root;
888                 }
889         }
890 
891         if (opt.check == 'u') {
892                 /* Only Joliet is case insensitive by default */
893                 if (joliet_level)
894                         opt.check = 'r';
895                 else
896                         opt.check = 's';
897         }
898         sbi->s_joliet_level = joliet_level;
899 
900         /* Make sure the root inode is a directory */
901         if (!S_ISDIR(inode->i_mode)) {
902                 printk(KERN_WARNING
903                         "isofs_fill_super: root inode is not a directory. "
904                         "Corrupted media?\n");
905                 goto out_iput;
906         }
907 
908         table = 0;
909         if (joliet_level)
910                 table += 2;
911         if (opt.check == 'r')
912                 table++;
913 
914         if (table)
915                 s->s_d_op = &isofs_dentry_ops[table - 1];
916 
917         /* get the root dentry */
918         s->s_root = d_make_root(inode);
919         if (!(s->s_root)) {
920                 error = -ENOMEM;
921                 goto out_no_inode;
922         }
923 
924         kfree(opt.iocharset);
925 
926         return 0;
927 
928         /*
929          * Display error messages and free resources.
930          */
931 out_iput:
932         iput(inode);
933         goto out_no_inode;
934 out_no_root:
935         error = PTR_ERR(inode);
936         if (error != -ENOMEM)
937                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
938 out_no_inode:
939 #ifdef CONFIG_JOLIET
940         unload_nls(sbi->s_nls_iocharset);
941 #endif
942         goto out_freesbi;
943 out_no_read:
944         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
945                 __func__, s->s_id, iso_blknum, block);
946         goto out_freebh;
947 out_bad_zone_size:
948         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
949                 sbi->s_log_zone_size);
950         goto out_freebh;
951 out_bad_size:
952         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
953                 orig_zonesize, opt.blocksize);
954         goto out_freebh;
955 out_unknown_format:
956         if (!silent)
957                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
958 
959 out_freebh:
960         brelse(bh);
961         brelse(pri_bh);
962 out_freesbi:
963         kfree(opt.iocharset);
964         kfree(sbi);
965         s->s_fs_info = NULL;
966         return error;
967 }
968 
969 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
970 {
971         struct super_block *sb = dentry->d_sb;
972         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
973 
974         buf->f_type = ISOFS_SUPER_MAGIC;
975         buf->f_bsize = sb->s_blocksize;
976         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
977                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
978         buf->f_bfree = 0;
979         buf->f_bavail = 0;
980         buf->f_files = ISOFS_SB(sb)->s_ninodes;
981         buf->f_ffree = 0;
982         buf->f_fsid.val[0] = (u32)id;
983         buf->f_fsid.val[1] = (u32)(id >> 32);
984         buf->f_namelen = NAME_MAX;
985         return 0;
986 }
987 
988 /*
989  * Get a set of blocks; filling in buffer_heads if already allocated
990  * or getblk() if they are not.  Returns the number of blocks inserted
991  * (-ve == error.)
992  */
993 int isofs_get_blocks(struct inode *inode, sector_t iblock,
994                      struct buffer_head **bh, unsigned long nblocks)
995 {
996         unsigned long b_off = iblock;
997         unsigned offset, sect_size;
998         unsigned int firstext;
999         unsigned long nextblk, nextoff;
1000         int section, rv, error;
1001         struct iso_inode_info *ei = ISOFS_I(inode);
1002 
1003         error = -EIO;
1004         rv = 0;
1005         if (iblock != b_off) {
1006                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1007                 goto abort;
1008         }
1009 
1010 
1011         offset = 0;
1012         firstext = ei->i_first_extent;
1013         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1014         nextblk = ei->i_next_section_block;
1015         nextoff = ei->i_next_section_offset;
1016         section = 0;
1017 
1018         while (nblocks) {
1019                 /* If we are *way* beyond the end of the file, print a message.
1020                  * Access beyond the end of the file up to the next page boundary
1021                  * is normal, however because of the way the page cache works.
1022                  * In this case, we just return 0 so that we can properly fill
1023                  * the page with useless information without generating any
1024                  * I/O errors.
1025                  */
1026                 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1027                         printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1028                                 __func__, b_off,
1029                                 (unsigned long long)inode->i_size);
1030                         goto abort;
1031                 }
1032 
1033                 /* On the last section, nextblk == 0, section size is likely to
1034                  * exceed sect_size by a partial block, and access beyond the
1035                  * end of the file will reach beyond the section size, too.
1036                  */
1037                 while (nextblk && (b_off >= (offset + sect_size))) {
1038                         struct inode *ninode;
1039 
1040                         offset += sect_size;
1041                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1042                         if (IS_ERR(ninode)) {
1043                                 error = PTR_ERR(ninode);
1044                                 goto abort;
1045                         }
1046                         firstext  = ISOFS_I(ninode)->i_first_extent;
1047                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1048                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1049                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1050                         iput(ninode);
1051 
1052                         if (++section > 100) {
1053                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1054                                         " aborting...\n", __func__);
1055                                 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1056                                         "nextblk=%lu nextoff=%lu\n", __func__,
1057                                         b_off, firstext, (unsigned) sect_size,
1058                                         nextblk, nextoff);
1059                                 goto abort;
1060                         }
1061                 }
1062 
1063                 if (*bh) {
1064                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1065                 } else {
1066                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1067                         if (!*bh)
1068                                 goto abort;
1069                 }
1070                 bh++;   /* Next buffer head */
1071                 b_off++;        /* Next buffer offset */
1072                 nblocks--;
1073                 rv++;
1074         }
1075 
1076         error = 0;
1077 abort:
1078         return rv != 0 ? rv : error;
1079 }
1080 
1081 /*
1082  * Used by the standard interfaces.
1083  */
1084 static int isofs_get_block(struct inode *inode, sector_t iblock,
1085                     struct buffer_head *bh_result, int create)
1086 {
1087         int ret;
1088 
1089         if (create) {
1090                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1091                 return -EROFS;
1092         }
1093 
1094         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1095         return ret < 0 ? ret : 0;
1096 }
1097 
1098 static int isofs_bmap(struct inode *inode, sector_t block)
1099 {
1100         struct buffer_head dummy;
1101         int error;
1102 
1103         dummy.b_state = 0;
1104         dummy.b_blocknr = -1000;
1105         error = isofs_get_block(inode, block, &dummy, 0);
1106         if (!error)
1107                 return dummy.b_blocknr;
1108         return 0;
1109 }
1110 
1111 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1112 {
1113         sector_t blknr = isofs_bmap(inode, block);
1114         if (!blknr)
1115                 return NULL;
1116         return sb_bread(inode->i_sb, blknr);
1117 }
1118 
1119 static int isofs_readpage(struct file *file, struct page *page)
1120 {
1121         return mpage_readpage(page, isofs_get_block);
1122 }
1123 
1124 static int isofs_readpages(struct file *file, struct address_space *mapping,
1125                         struct list_head *pages, unsigned nr_pages)
1126 {
1127         return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1128 }
1129 
1130 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1131 {
1132         return generic_block_bmap(mapping,block,isofs_get_block);
1133 }
1134 
1135 static const struct address_space_operations isofs_aops = {
1136         .readpage = isofs_readpage,
1137         .readpages = isofs_readpages,
1138         .bmap = _isofs_bmap
1139 };
1140 
1141 static int isofs_read_level3_size(struct inode *inode)
1142 {
1143         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1144         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1145         struct buffer_head *bh = NULL;
1146         unsigned long block, offset, block_saved, offset_saved;
1147         int i = 0;
1148         int more_entries = 0;
1149         struct iso_directory_record *tmpde = NULL;
1150         struct iso_inode_info *ei = ISOFS_I(inode);
1151 
1152         inode->i_size = 0;
1153 
1154         /* The first 16 blocks are reserved as the System Area.  Thus,
1155          * no inodes can appear in block 0.  We use this to flag that
1156          * this is the last section. */
1157         ei->i_next_section_block = 0;
1158         ei->i_next_section_offset = 0;
1159 
1160         block = ei->i_iget5_block;
1161         offset = ei->i_iget5_offset;
1162 
1163         do {
1164                 struct iso_directory_record *de;
1165                 unsigned int de_len;
1166 
1167                 if (!bh) {
1168                         bh = sb_bread(inode->i_sb, block);
1169                         if (!bh)
1170                                 goto out_noread;
1171                 }
1172                 de = (struct iso_directory_record *) (bh->b_data + offset);
1173                 de_len = *(unsigned char *) de;
1174 
1175                 if (de_len == 0) {
1176                         brelse(bh);
1177                         bh = NULL;
1178                         ++block;
1179                         offset = 0;
1180                         continue;
1181                 }
1182 
1183                 block_saved = block;
1184                 offset_saved = offset;
1185                 offset += de_len;
1186 
1187                 /* Make sure we have a full directory entry */
1188                 if (offset >= bufsize) {
1189                         int slop = bufsize - offset + de_len;
1190                         if (!tmpde) {
1191                                 tmpde = kmalloc(256, GFP_KERNEL);
1192                                 if (!tmpde)
1193                                         goto out_nomem;
1194                         }
1195                         memcpy(tmpde, de, slop);
1196                         offset &= bufsize - 1;
1197                         block++;
1198                         brelse(bh);
1199                         bh = NULL;
1200                         if (offset) {
1201                                 bh = sb_bread(inode->i_sb, block);
1202                                 if (!bh)
1203                                         goto out_noread;
1204                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1205                         }
1206                         de = tmpde;
1207                 }
1208 
1209                 inode->i_size += isonum_733(de->size);
1210                 if (i == 1) {
1211                         ei->i_next_section_block = block_saved;
1212                         ei->i_next_section_offset = offset_saved;
1213                 }
1214 
1215                 more_entries = de->flags[-high_sierra] & 0x80;
1216 
1217                 i++;
1218                 if (i > 100)
1219                         goto out_toomany;
1220         } while (more_entries);
1221 out:
1222         kfree(tmpde);
1223         if (bh)
1224                 brelse(bh);
1225         return 0;
1226 
1227 out_nomem:
1228         if (bh)
1229                 brelse(bh);
1230         return -ENOMEM;
1231 
1232 out_noread:
1233         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1234         kfree(tmpde);
1235         return -EIO;
1236 
1237 out_toomany:
1238         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1239                 "isofs_read_level3_size: inode=%lu\n",
1240                 __func__, inode->i_ino);
1241         goto out;
1242 }
1243 
1244 static int isofs_read_inode(struct inode *inode, int relocated)
1245 {
1246         struct super_block *sb = inode->i_sb;
1247         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1248         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1249         unsigned long block;
1250         int high_sierra = sbi->s_high_sierra;
1251         struct buffer_head *bh = NULL;
1252         struct iso_directory_record *de;
1253         struct iso_directory_record *tmpde = NULL;
1254         unsigned int de_len;
1255         unsigned long offset;
1256         struct iso_inode_info *ei = ISOFS_I(inode);
1257         int ret = -EIO;
1258 
1259         block = ei->i_iget5_block;
1260         bh = sb_bread(inode->i_sb, block);
1261         if (!bh)
1262                 goto out_badread;
1263 
1264         offset = ei->i_iget5_offset;
1265 
1266         de = (struct iso_directory_record *) (bh->b_data + offset);
1267         de_len = *(unsigned char *) de;
1268 
1269         if (offset + de_len > bufsize) {
1270                 int frag1 = bufsize - offset;
1271 
1272                 tmpde = kmalloc(de_len, GFP_KERNEL);
1273                 if (tmpde == NULL) {
1274                         printk(KERN_INFO "%s: out of memory\n", __func__);
1275                         ret = -ENOMEM;
1276                         goto fail;
1277                 }
1278                 memcpy(tmpde, bh->b_data + offset, frag1);
1279                 brelse(bh);
1280                 bh = sb_bread(inode->i_sb, ++block);
1281                 if (!bh)
1282                         goto out_badread;
1283                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1284                 de = tmpde;
1285         }
1286 
1287         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1288                                         ei->i_iget5_offset,
1289                                         ISOFS_BUFFER_BITS(inode));
1290 
1291         /* Assume it is a normal-format file unless told otherwise */
1292         ei->i_file_format = isofs_file_normal;
1293 
1294         if (de->flags[-high_sierra] & 2) {
1295                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1296                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1297                 else
1298                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1299                 set_nlink(inode, 1);    /*
1300                                          * Set to 1.  We know there are 2, but
1301                                          * the find utility tries to optimize
1302                                          * if it is 2, and it screws up.  It is
1303                                          * easier to give 1 which tells find to
1304                                          * do it the hard way.
1305                                          */
1306         } else {
1307                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1308                         inode->i_mode = S_IFREG | sbi->s_fmode;
1309                 } else {
1310                         /*
1311                          * Set default permissions: r-x for all.  The disc
1312                          * could be shared with DOS machines so virtually
1313                          * anything could be a valid executable.
1314                          */
1315                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1316                 }
1317                 set_nlink(inode, 1);
1318         }
1319         inode->i_uid = sbi->s_uid;
1320         inode->i_gid = sbi->s_gid;
1321         inode->i_blocks = 0;
1322 
1323         ei->i_format_parm[0] = 0;
1324         ei->i_format_parm[1] = 0;
1325         ei->i_format_parm[2] = 0;
1326 
1327         ei->i_section_size = isonum_733(de->size);
1328         if (de->flags[-high_sierra] & 0x80) {
1329                 ret = isofs_read_level3_size(inode);
1330                 if (ret < 0)
1331                         goto fail;
1332                 ret = -EIO;
1333         } else {
1334                 ei->i_next_section_block = 0;
1335                 ei->i_next_section_offset = 0;
1336                 inode->i_size = isonum_733(de->size);
1337         }
1338 
1339         /*
1340          * Some dipshit decided to store some other bit of information
1341          * in the high byte of the file length.  Truncate size in case
1342          * this CDROM was mounted with the cruft option.
1343          */
1344 
1345         if (sbi->s_cruft)
1346                 inode->i_size &= 0x00ffffff;
1347 
1348         if (de->interleave[0]) {
1349                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1350                 inode->i_size = 0;
1351         }
1352 
1353         /* I have no idea what file_unit_size is used for, so
1354            we will flag it for now */
1355         if (de->file_unit_size[0] != 0) {
1356                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1357                         inode->i_ino);
1358         }
1359 
1360         /* I have no idea what other flag bits are used for, so
1361            we will flag it for now */
1362 #ifdef DEBUG
1363         if((de->flags[-high_sierra] & ~2)!= 0){
1364                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1365                                 "(%ld %x).\n",
1366                         inode->i_ino, de->flags[-high_sierra]);
1367         }
1368 #endif
1369 
1370         inode->i_mtime.tv_sec =
1371         inode->i_atime.tv_sec =
1372         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1373         inode->i_mtime.tv_nsec =
1374         inode->i_atime.tv_nsec =
1375         inode->i_ctime.tv_nsec = 0;
1376 
1377         ei->i_first_extent = (isonum_733(de->extent) +
1378                         isonum_711(de->ext_attr_length));
1379 
1380         /* Set the number of blocks for stat() - should be done before RR */
1381         inode->i_blocks = (inode->i_size + 511) >> 9;
1382 
1383         /*
1384          * Now test for possible Rock Ridge extensions which will override
1385          * some of these numbers in the inode structure.
1386          */
1387 
1388         if (!high_sierra) {
1389                 parse_rock_ridge_inode(de, inode, relocated);
1390                 /* if we want uid/gid set, override the rock ridge setting */
1391                 if (sbi->s_uid_set)
1392                         inode->i_uid = sbi->s_uid;
1393                 if (sbi->s_gid_set)
1394                         inode->i_gid = sbi->s_gid;
1395         }
1396         /* Now set final access rights if overriding rock ridge setting */
1397         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1398             sbi->s_dmode != ISOFS_INVALID_MODE)
1399                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1400         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1401             sbi->s_fmode != ISOFS_INVALID_MODE)
1402                 inode->i_mode = S_IFREG | sbi->s_fmode;
1403 
1404         /* Install the inode operations vector */
1405         if (S_ISREG(inode->i_mode)) {
1406                 inode->i_fop = &generic_ro_fops;
1407                 switch (ei->i_file_format) {
1408 #ifdef CONFIG_ZISOFS
1409                 case isofs_file_compressed:
1410                         inode->i_data.a_ops = &zisofs_aops;
1411                         break;
1412 #endif
1413                 default:
1414                         inode->i_data.a_ops = &isofs_aops;
1415                         break;
1416                 }
1417         } else if (S_ISDIR(inode->i_mode)) {
1418                 inode->i_op = &isofs_dir_inode_operations;
1419                 inode->i_fop = &isofs_dir_operations;
1420         } else if (S_ISLNK(inode->i_mode)) {
1421                 inode->i_op = &page_symlink_inode_operations;
1422                 inode_nohighmem(inode);
1423                 inode->i_data.a_ops = &isofs_symlink_aops;
1424         } else
1425                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1426                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1427 
1428         ret = 0;
1429 out:
1430         kfree(tmpde);
1431         if (bh)
1432                 brelse(bh);
1433         return ret;
1434 
1435 out_badread:
1436         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1437 fail:
1438         goto out;
1439 }
1440 
1441 struct isofs_iget5_callback_data {
1442         unsigned long block;
1443         unsigned long offset;
1444 };
1445 
1446 static int isofs_iget5_test(struct inode *ino, void *data)
1447 {
1448         struct iso_inode_info *i = ISOFS_I(ino);
1449         struct isofs_iget5_callback_data *d =
1450                 (struct isofs_iget5_callback_data*)data;
1451         return (i->i_iget5_block == d->block)
1452                 && (i->i_iget5_offset == d->offset);
1453 }
1454 
1455 static int isofs_iget5_set(struct inode *ino, void *data)
1456 {
1457         struct iso_inode_info *i = ISOFS_I(ino);
1458         struct isofs_iget5_callback_data *d =
1459                 (struct isofs_iget5_callback_data*)data;
1460         i->i_iget5_block = d->block;
1461         i->i_iget5_offset = d->offset;
1462         return 0;
1463 }
1464 
1465 /* Store, in the inode's containing structure, the block and block
1466  * offset that point to the underlying meta-data for the inode.  The
1467  * code below is otherwise similar to the iget() code in
1468  * include/linux/fs.h */
1469 struct inode *__isofs_iget(struct super_block *sb,
1470                            unsigned long block,
1471                            unsigned long offset,
1472                            int relocated)
1473 {
1474         unsigned long hashval;
1475         struct inode *inode;
1476         struct isofs_iget5_callback_data data;
1477         long ret;
1478 
1479         if (offset >= 1ul << sb->s_blocksize_bits)
1480                 return ERR_PTR(-EINVAL);
1481 
1482         data.block = block;
1483         data.offset = offset;
1484 
1485         hashval = (block << sb->s_blocksize_bits) | offset;
1486 
1487         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1488                                 &isofs_iget5_set, &data);
1489 
1490         if (!inode)
1491                 return ERR_PTR(-ENOMEM);
1492 
1493         if (inode->i_state & I_NEW) {
1494                 ret = isofs_read_inode(inode, relocated);
1495                 if (ret < 0) {
1496                         iget_failed(inode);
1497                         inode = ERR_PTR(ret);
1498                 } else {
1499                         unlock_new_inode(inode);
1500                 }
1501         }
1502 
1503         return inode;
1504 }
1505 
1506 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1507         int flags, const char *dev_name, void *data)
1508 {
1509         return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1510 }
1511 
1512 static struct file_system_type iso9660_fs_type = {
1513         .owner          = THIS_MODULE,
1514         .name           = "iso9660",
1515         .mount          = isofs_mount,
1516         .kill_sb        = kill_block_super,
1517         .fs_flags       = FS_REQUIRES_DEV,
1518 };
1519 MODULE_ALIAS_FS("iso9660");
1520 MODULE_ALIAS("iso9660");
1521 
1522 static int __init init_iso9660_fs(void)
1523 {
1524         int err = init_inodecache();
1525         if (err)
1526                 goto out;
1527 #ifdef CONFIG_ZISOFS
1528         err = zisofs_init();
1529         if (err)
1530                 goto out1;
1531 #endif
1532         err = register_filesystem(&iso9660_fs_type);
1533         if (err)
1534                 goto out2;
1535         return 0;
1536 out2:
1537 #ifdef CONFIG_ZISOFS
1538         zisofs_cleanup();
1539 out1:
1540 #endif
1541         destroy_inodecache();
1542 out:
1543         return err;
1544 }
1545 
1546 static void __exit exit_iso9660_fs(void)
1547 {
1548         unregister_filesystem(&iso9660_fs_type);
1549 #ifdef CONFIG_ZISOFS
1550         zisofs_cleanup();
1551 #endif
1552         destroy_inodecache();
1553 }
1554 
1555 module_init(init_iso9660_fs)
1556 module_exit(exit_iso9660_fs)
1557 MODULE_LICENSE("GPL");
1558 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us