Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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_hash(const struct dentry *parent, struct qstr *qstr);
 33 static int isofs_dentry_cmpi(const struct dentry *parent,
 34                 const struct dentry *dentry,
 35                 unsigned int len, const char *str, const struct qstr *name);
 36 static int isofs_dentry_cmp(const struct dentry *parent,
 37                 const struct dentry *dentry,
 38                 unsigned int len, const char *str, const struct qstr *name);
 39 
 40 #ifdef CONFIG_JOLIET
 41 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
 42 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
 43 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
 44                 const struct dentry *dentry,
 45                 unsigned int len, const char *str, const struct qstr *name);
 46 static int isofs_dentry_cmp_ms(const struct dentry *parent,
 47                 const struct dentry *dentry,
 48                 unsigned int len, const char *str, const struct qstr *name);
 49 #endif
 50 
 51 static void isofs_put_super(struct super_block *sb)
 52 {
 53         struct isofs_sb_info *sbi = ISOFS_SB(sb);
 54 
 55 #ifdef CONFIG_JOLIET
 56         unload_nls(sbi->s_nls_iocharset);
 57 #endif
 58 
 59         kfree(sbi);
 60         sb->s_fs_info = NULL;
 61         return;
 62 }
 63 
 64 static int isofs_read_inode(struct inode *);
 65 static int isofs_statfs (struct dentry *, struct kstatfs *);
 66 
 67 static struct kmem_cache *isofs_inode_cachep;
 68 
 69 static struct inode *isofs_alloc_inode(struct super_block *sb)
 70 {
 71         struct iso_inode_info *ei;
 72         ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
 73         if (!ei)
 74                 return NULL;
 75         return &ei->vfs_inode;
 76 }
 77 
 78 static void isofs_i_callback(struct rcu_head *head)
 79 {
 80         struct inode *inode = container_of(head, struct inode, i_rcu);
 81         kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
 82 }
 83 
 84 static void isofs_destroy_inode(struct inode *inode)
 85 {
 86         call_rcu(&inode->i_rcu, isofs_i_callback);
 87 }
 88 
 89 static void init_once(void *foo)
 90 {
 91         struct iso_inode_info *ei = foo;
 92 
 93         inode_init_once(&ei->vfs_inode);
 94 }
 95 
 96 static int __init init_inodecache(void)
 97 {
 98         isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
 99                                         sizeof(struct iso_inode_info),
100                                         0, (SLAB_RECLAIM_ACCOUNT|
101                                         SLAB_MEM_SPREAD),
102                                         init_once);
103         if (isofs_inode_cachep == NULL)
104                 return -ENOMEM;
105         return 0;
106 }
107 
108 static void destroy_inodecache(void)
109 {
110         /*
111          * Make sure all delayed rcu free inodes are flushed before we
112          * destroy cache.
113          */
114         rcu_barrier();
115         kmem_cache_destroy(isofs_inode_cachep);
116 }
117 
118 static int isofs_remount(struct super_block *sb, int *flags, char *data)
119 {
120         sync_filesystem(sb);
121         if (!(*flags & MS_RDONLY))
122                 return -EROFS;
123         return 0;
124 }
125 
126 static const struct super_operations isofs_sops = {
127         .alloc_inode    = isofs_alloc_inode,
128         .destroy_inode  = isofs_destroy_inode,
129         .put_super      = isofs_put_super,
130         .statfs         = isofs_statfs,
131         .remount_fs     = isofs_remount,
132         .show_options   = generic_show_options,
133 };
134 
135 
136 static const struct dentry_operations isofs_dentry_ops[] = {
137         {
138                 .d_hash         = isofs_hash,
139                 .d_compare      = isofs_dentry_cmp,
140         },
141         {
142                 .d_hash         = isofs_hashi,
143                 .d_compare      = isofs_dentry_cmpi,
144         },
145 #ifdef CONFIG_JOLIET
146         {
147                 .d_hash         = isofs_hash_ms,
148                 .d_compare      = isofs_dentry_cmp_ms,
149         },
150         {
151                 .d_hash         = isofs_hashi_ms,
152                 .d_compare      = isofs_dentry_cmpi_ms,
153         },
154 #endif
155 };
156 
157 struct iso9660_options{
158         unsigned int rock:1;
159         unsigned int joliet:1;
160         unsigned int cruft:1;
161         unsigned int hide:1;
162         unsigned int showassoc:1;
163         unsigned int nocompress:1;
164         unsigned int overriderockperm:1;
165         unsigned int uid_set:1;
166         unsigned int gid_set:1;
167         unsigned int utf8:1;
168         unsigned char map;
169         unsigned char check;
170         unsigned int blocksize;
171         umode_t fmode;
172         umode_t dmode;
173         kgid_t gid;
174         kuid_t uid;
175         char *iocharset;
176         /* LVE */
177         s32 session;
178         s32 sbsector;
179 };
180 
181 /*
182  * Compute the hash for the isofs name corresponding to the dentry.
183  */
184 static int
185 isofs_hash_common(struct qstr *qstr, int ms)
186 {
187         const char *name;
188         int len;
189 
190         len = qstr->len;
191         name = qstr->name;
192         if (ms) {
193                 while (len && name[len-1] == '.')
194                         len--;
195         }
196 
197         qstr->hash = full_name_hash(name, len);
198 
199         return 0;
200 }
201 
202 /*
203  * Compute the hash for the isofs name corresponding to the dentry.
204  */
205 static int
206 isofs_hashi_common(struct qstr *qstr, int ms)
207 {
208         const char *name;
209         int len;
210         char c;
211         unsigned long hash;
212 
213         len = qstr->len;
214         name = qstr->name;
215         if (ms) {
216                 while (len && name[len-1] == '.')
217                         len--;
218         }
219 
220         hash = init_name_hash();
221         while (len--) {
222                 c = tolower(*name++);
223                 hash = partial_name_hash(c, hash);
224         }
225         qstr->hash = end_name_hash(hash);
226 
227         return 0;
228 }
229 
230 /*
231  * Compare of two isofs names.
232  */
233 static int isofs_dentry_cmp_common(
234                 unsigned int len, const char *str,
235                 const struct qstr *name, int ms, int ci)
236 {
237         int alen, blen;
238 
239         /* A filename cannot end in '.' or we treat it like it has none */
240         alen = name->len;
241         blen = len;
242         if (ms) {
243                 while (alen && name->name[alen-1] == '.')
244                         alen--;
245                 while (blen && str[blen-1] == '.')
246                         blen--;
247         }
248         if (alen == blen) {
249                 if (ci) {
250                         if (strnicmp(name->name, str, alen) == 0)
251                                 return 0;
252                 } else {
253                         if (strncmp(name->name, str, alen) == 0)
254                                 return 0;
255                 }
256         }
257         return 1;
258 }
259 
260 static int
261 isofs_hash(const struct dentry *dentry, struct qstr *qstr)
262 {
263         return isofs_hash_common(qstr, 0);
264 }
265 
266 static int
267 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
268 {
269         return isofs_hashi_common(qstr, 0);
270 }
271 
272 static int
273 isofs_dentry_cmp(const struct dentry *parent, const struct dentry *dentry,
274                 unsigned int len, const char *str, const struct qstr *name)
275 {
276         return isofs_dentry_cmp_common(len, str, name, 0, 0);
277 }
278 
279 static int
280 isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry,
281                 unsigned int len, const char *str, const struct qstr *name)
282 {
283         return isofs_dentry_cmp_common(len, str, name, 0, 1);
284 }
285 
286 #ifdef CONFIG_JOLIET
287 static int
288 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
289 {
290         return isofs_hash_common(qstr, 1);
291 }
292 
293 static int
294 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
295 {
296         return isofs_hashi_common(qstr, 1);
297 }
298 
299 static int
300 isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry,
301                 unsigned int len, const char *str, const struct qstr *name)
302 {
303         return isofs_dentry_cmp_common(len, str, name, 1, 0);
304 }
305 
306 static int
307 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
308                 unsigned int len, const char *str, const struct qstr *name)
309 {
310         return isofs_dentry_cmp_common(len, str, name, 1, 1);
311 }
312 #endif
313 
314 enum {
315         Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
316         Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
317         Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
318         Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
319 };
320 
321 static const match_table_t tokens = {
322         {Opt_norock, "norock"},
323         {Opt_nojoliet, "nojoliet"},
324         {Opt_unhide, "unhide"},
325         {Opt_hide, "hide"},
326         {Opt_showassoc, "showassoc"},
327         {Opt_cruft, "cruft"},
328         {Opt_utf8, "utf8"},
329         {Opt_iocharset, "iocharset=%s"},
330         {Opt_map_a, "map=acorn"},
331         {Opt_map_a, "map=a"},
332         {Opt_map_n, "map=normal"},
333         {Opt_map_n, "map=n"},
334         {Opt_map_o, "map=off"},
335         {Opt_map_o, "map=o"},
336         {Opt_session, "session=%u"},
337         {Opt_sb, "sbsector=%u"},
338         {Opt_check_r, "check=relaxed"},
339         {Opt_check_r, "check=r"},
340         {Opt_check_s, "check=strict"},
341         {Opt_check_s, "check=s"},
342         {Opt_uid, "uid=%u"},
343         {Opt_gid, "gid=%u"},
344         {Opt_mode, "mode=%u"},
345         {Opt_dmode, "dmode=%u"},
346         {Opt_overriderockperm, "overriderockperm"},
347         {Opt_block, "block=%u"},
348         {Opt_ignore, "conv=binary"},
349         {Opt_ignore, "conv=b"},
350         {Opt_ignore, "conv=text"},
351         {Opt_ignore, "conv=t"},
352         {Opt_ignore, "conv=mtext"},
353         {Opt_ignore, "conv=m"},
354         {Opt_ignore, "conv=auto"},
355         {Opt_ignore, "conv=a"},
356         {Opt_nocompress, "nocompress"},
357         {Opt_err, NULL}
358 };
359 
360 static int parse_options(char *options, struct iso9660_options *popt)
361 {
362         char *p;
363         int option;
364 
365         popt->map = 'n';
366         popt->rock = 1;
367         popt->joliet = 1;
368         popt->cruft = 0;
369         popt->hide = 0;
370         popt->showassoc = 0;
371         popt->check = 'u';              /* unset */
372         popt->nocompress = 0;
373         popt->blocksize = 1024;
374         popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
375         popt->uid_set = 0;
376         popt->gid_set = 0;
377         popt->gid = GLOBAL_ROOT_GID;
378         popt->uid = GLOBAL_ROOT_UID;
379         popt->iocharset = NULL;
380         popt->utf8 = 0;
381         popt->overriderockperm = 0;
382         popt->session=-1;
383         popt->sbsector=-1;
384         if (!options)
385                 return 1;
386 
387         while ((p = strsep(&options, ",")) != NULL) {
388                 int token;
389                 substring_t args[MAX_OPT_ARGS];
390                 unsigned n;
391 
392                 if (!*p)
393                         continue;
394 
395                 token = match_token(p, tokens, args);
396                 switch (token) {
397                 case Opt_norock:
398                         popt->rock = 0;
399                         break;
400                 case Opt_nojoliet:
401                         popt->joliet = 0;
402                         break;
403                 case Opt_hide:
404                         popt->hide = 1;
405                         break;
406                 case Opt_unhide:
407                 case Opt_showassoc:
408                         popt->showassoc = 1;
409                         break;
410                 case Opt_cruft:
411                         popt->cruft = 1;
412                         break;
413                 case Opt_utf8:
414                         popt->utf8 = 1;
415                         break;
416 #ifdef CONFIG_JOLIET
417                 case Opt_iocharset:
418                         popt->iocharset = match_strdup(&args[0]);
419                         break;
420 #endif
421                 case Opt_map_a:
422                         popt->map = 'a';
423                         break;
424                 case Opt_map_o:
425                         popt->map = 'o';
426                         break;
427                 case Opt_map_n:
428                         popt->map = 'n';
429                         break;
430                 case Opt_session:
431                         if (match_int(&args[0], &option))
432                                 return 0;
433                         n = option;
434                         if (n > 99)
435                                 return 0;
436                         popt->session = n + 1;
437                         break;
438                 case Opt_sb:
439                         if (match_int(&args[0], &option))
440                                 return 0;
441                         popt->sbsector = option;
442                         break;
443                 case Opt_check_r:
444                         popt->check = 'r';
445                         break;
446                 case Opt_check_s:
447                         popt->check = 's';
448                         break;
449                 case Opt_ignore:
450                         break;
451                 case Opt_uid:
452                         if (match_int(&args[0], &option))
453                                 return 0;
454                         popt->uid = make_kuid(current_user_ns(), option);
455                         if (!uid_valid(popt->uid))
456                                 return 0;
457                         popt->uid_set = 1;
458                         break;
459                 case Opt_gid:
460                         if (match_int(&args[0], &option))
461                                 return 0;
462                         popt->gid = make_kgid(current_user_ns(), option);
463                         if (!gid_valid(popt->gid))
464                                 return 0;
465                         popt->gid_set = 1;
466                         break;
467                 case Opt_mode:
468                         if (match_int(&args[0], &option))
469                                 return 0;
470                         popt->fmode = option;
471                         break;
472                 case Opt_dmode:
473                         if (match_int(&args[0], &option))
474                                 return 0;
475                         popt->dmode = option;
476                         break;
477                 case Opt_overriderockperm:
478                         popt->overriderockperm = 1;
479                         break;
480                 case Opt_block:
481                         if (match_int(&args[0], &option))
482                                 return 0;
483                         n = option;
484                         if (n != 512 && n != 1024 && n != 2048)
485                                 return 0;
486                         popt->blocksize = n;
487                         break;
488                 case Opt_nocompress:
489                         popt->nocompress = 1;
490                         break;
491                 default:
492                         return 0;
493                 }
494         }
495         return 1;
496 }
497 
498 /*
499  * look if the driver can tell the multi session redirection value
500  *
501  * don't change this if you don't know what you do, please!
502  * Multisession is legal only with XA disks.
503  * A non-XA disk with more than one volume descriptor may do it right, but
504  * usually is written in a nowhere standardized "multi-partition" manner.
505  * Multisession uses absolute addressing (solely the first frame of the whole
506  * track is #0), multi-partition uses relative addressing (each first frame of
507  * each track is #0), and a track is not a session.
508  *
509  * A broken CDwriter software or drive firmware does not set new standards,
510  * at least not if conflicting with the existing ones.
511  *
512  * emoenke@gwdg.de
513  */
514 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
515 
516 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
517 {
518         struct cdrom_multisession ms_info;
519         unsigned int vol_desc_start;
520         struct block_device *bdev = sb->s_bdev;
521         int i;
522 
523         vol_desc_start=0;
524         ms_info.addr_format=CDROM_LBA;
525         if(session >= 0 && session <= 99) {
526                 struct cdrom_tocentry Te;
527                 Te.cdte_track=session;
528                 Te.cdte_format=CDROM_LBA;
529                 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
530                 if (!i) {
531                         printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
532                                 session, Te.cdte_addr.lba,
533                                 Te.cdte_ctrl&CDROM_DATA_TRACK);
534                         if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
535                                 return Te.cdte_addr.lba;
536                 }
537 
538                 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
539         }
540         i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
541         if (session > 0)
542                 printk(KERN_ERR "ISOFS: Invalid session number\n");
543 #if 0
544         printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
545         if (i==0) {
546                 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
547                 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
548         }
549 #endif
550         if (i==0)
551 #if WE_OBEY_THE_WRITTEN_STANDARDS
552                 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
553 #endif
554                         vol_desc_start=ms_info.addr.lba;
555         return vol_desc_start;
556 }
557 
558 /*
559  * Check if root directory is empty (has less than 3 files).
560  *
561  * Used to detect broken CDs where ISO root directory is empty but Joliet root
562  * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
563  * (and Joliet used instead) or else no files would be visible.
564  */
565 static bool rootdir_empty(struct super_block *sb, unsigned long block)
566 {
567         int offset = 0, files = 0, de_len;
568         struct iso_directory_record *de;
569         struct buffer_head *bh;
570 
571         bh = sb_bread(sb, block);
572         if (!bh)
573                 return true;
574         while (files < 3) {
575                 de = (struct iso_directory_record *) (bh->b_data + offset);
576                 de_len = *(unsigned char *) de;
577                 if (de_len == 0)
578                         break;
579                 files++;
580                 offset += de_len;
581         }
582         brelse(bh);
583         return files < 3;
584 }
585 
586 /*
587  * Initialize the superblock and read the root inode.
588  *
589  * Note: a check_disk_change() has been done immediately prior
590  * to this call, so we don't need to check again.
591  */
592 static int isofs_fill_super(struct super_block *s, void *data, int silent)
593 {
594         struct buffer_head *bh = NULL, *pri_bh = NULL;
595         struct hs_primary_descriptor *h_pri = NULL;
596         struct iso_primary_descriptor *pri = NULL;
597         struct iso_supplementary_descriptor *sec = NULL;
598         struct iso_directory_record *rootp;
599         struct inode *inode;
600         struct iso9660_options opt;
601         struct isofs_sb_info *sbi;
602         unsigned long first_data_zone;
603         int joliet_level = 0;
604         int iso_blknum, block;
605         int orig_zonesize;
606         int table, error = -EINVAL;
607         unsigned int vol_desc_start;
608 
609         save_mount_options(s, data);
610 
611         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
612         if (!sbi)
613                 return -ENOMEM;
614         s->s_fs_info = sbi;
615 
616         if (!parse_options((char *)data, &opt))
617                 goto out_freesbi;
618 
619         /*
620          * First of all, get the hardware blocksize for this device.
621          * If we don't know what it is, or the hardware blocksize is
622          * larger than the blocksize the user specified, then use
623          * that value.
624          */
625         /*
626          * What if bugger tells us to go beyond page size?
627          */
628         opt.blocksize = sb_min_blocksize(s, opt.blocksize);
629 
630         sbi->s_high_sierra = 0; /* default is iso9660 */
631 
632         vol_desc_start = (opt.sbsector != -1) ?
633                 opt.sbsector : isofs_get_last_session(s,opt.session);
634 
635         for (iso_blknum = vol_desc_start+16;
636                 iso_blknum < vol_desc_start+100; iso_blknum++) {
637                 struct hs_volume_descriptor *hdp;
638                 struct iso_volume_descriptor  *vdp;
639 
640                 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
641                 if (!(bh = sb_bread(s, block)))
642                         goto out_no_read;
643 
644                 vdp = (struct iso_volume_descriptor *)bh->b_data;
645                 hdp = (struct hs_volume_descriptor *)bh->b_data;
646 
647                 /*
648                  * Due to the overlapping physical location of the descriptors,
649                  * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
650                  * proper identification in this case, we first check for ISO.
651                  */
652                 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
653                         if (isonum_711(vdp->type) == ISO_VD_END)
654                                 break;
655                         if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
656                                 if (pri == NULL) {
657                                         pri = (struct iso_primary_descriptor *)vdp;
658                                         /* Save the buffer in case we need it ... */
659                                         pri_bh = bh;
660                                         bh = NULL;
661                                 }
662                         }
663 #ifdef CONFIG_JOLIET
664                         else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
665                                 sec = (struct iso_supplementary_descriptor *)vdp;
666                                 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
667                                         if (opt.joliet) {
668                                                 if (sec->escape[2] == 0x40)
669                                                         joliet_level = 1;
670                                                 else if (sec->escape[2] == 0x43)
671                                                         joliet_level = 2;
672                                                 else if (sec->escape[2] == 0x45)
673                                                         joliet_level = 3;
674 
675                                                 printk(KERN_DEBUG "ISO 9660 Extensions: "
676                                                         "Microsoft Joliet Level %d\n",
677                                                         joliet_level);
678                                         }
679                                         goto root_found;
680                                 } else {
681                                 /* Unknown supplementary volume descriptor */
682                                 sec = NULL;
683                                 }
684                         }
685 #endif
686                 } else {
687                         if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
688                                 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
689                                         goto out_freebh;
690 
691                                 sbi->s_high_sierra = 1;
692                                 opt.rock = 0;
693                                 h_pri = (struct hs_primary_descriptor *)vdp;
694                                 goto root_found;
695                         }
696                 }
697 
698                 /* Just skip any volume descriptors we don't recognize */
699 
700                 brelse(bh);
701                 bh = NULL;
702         }
703         /*
704          * If we fall through, either no volume descriptor was found,
705          * or else we passed a primary descriptor looking for others.
706          */
707         if (!pri)
708                 goto out_unknown_format;
709         brelse(bh);
710         bh = pri_bh;
711         pri_bh = NULL;
712 
713 root_found:
714 
715         if (joliet_level && (pri == NULL || !opt.rock)) {
716                 /* This is the case of Joliet with the norock mount flag.
717                  * A disc with both Joliet and Rock Ridge is handled later
718                  */
719                 pri = (struct iso_primary_descriptor *) sec;
720         }
721 
722         if(sbi->s_high_sierra){
723                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
724                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
725                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
726                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
727         } else {
728                 if (!pri)
729                         goto out_freebh;
730                 rootp = (struct iso_directory_record *) pri->root_directory_record;
731                 sbi->s_nzones = isonum_733(pri->volume_space_size);
732                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
733                 sbi->s_max_size = isonum_733(pri->volume_space_size);
734         }
735 
736         sbi->s_ninodes = 0; /* No way to figure this out easily */
737 
738         orig_zonesize = sbi->s_log_zone_size;
739         /*
740          * If the zone size is smaller than the hardware sector size,
741          * this is a fatal error.  This would occur if the disc drive
742          * had sectors that were 2048 bytes, but the filesystem had
743          * blocks that were 512 bytes (which should only very rarely
744          * happen.)
745          */
746         if (orig_zonesize < opt.blocksize)
747                 goto out_bad_size;
748 
749         /* RDE: convert log zone size to bit shift */
750         switch (sbi->s_log_zone_size) {
751         case  512: sbi->s_log_zone_size =  9; break;
752         case 1024: sbi->s_log_zone_size = 10; break;
753         case 2048: sbi->s_log_zone_size = 11; break;
754 
755         default:
756                 goto out_bad_zone_size;
757         }
758 
759         s->s_magic = ISOFS_SUPER_MAGIC;
760 
761         /*
762          * With multi-extent files, file size is only limited by the maximum
763          * size of a file system, which is 8 TB.
764          */
765         s->s_maxbytes = 0x80000000000LL;
766 
767         /* Set this for reference. Its not currently used except on write
768            which we don't have .. */
769 
770         first_data_zone = isonum_733(rootp->extent) +
771                           isonum_711(rootp->ext_attr_length);
772         sbi->s_firstdatazone = first_data_zone;
773 #ifndef BEQUIET
774         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
775                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
776         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
777         if(sbi->s_high_sierra)
778                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
779 #endif
780 
781         /*
782          * If the Joliet level is set, we _may_ decide to use the
783          * secondary descriptor, but can't be sure until after we
784          * read the root inode. But before reading the root inode
785          * we may need to change the device blocksize, and would
786          * rather release the old buffer first. So, we cache the
787          * first_data_zone value from the secondary descriptor.
788          */
789         if (joliet_level) {
790                 pri = (struct iso_primary_descriptor *) sec;
791                 rootp = (struct iso_directory_record *)
792                         pri->root_directory_record;
793                 first_data_zone = isonum_733(rootp->extent) +
794                                 isonum_711(rootp->ext_attr_length);
795         }
796 
797         /*
798          * We're all done using the volume descriptor, and may need
799          * to change the device blocksize, so release the buffer now.
800          */
801         brelse(pri_bh);
802         brelse(bh);
803 
804         /*
805          * Force the blocksize to 512 for 512 byte sectors.  The file
806          * read primitives really get it wrong in a bad way if we don't
807          * do this.
808          *
809          * Note - we should never be setting the blocksize to something
810          * less than the hardware sector size for the device.  If we
811          * do, we would end up having to read larger buffers and split
812          * out portions to satisfy requests.
813          *
814          * Note2- the idea here is that we want to deal with the optimal
815          * zonesize in the filesystem.  If we have it set to something less,
816          * then we have horrible problems with trying to piece together
817          * bits of adjacent blocks in order to properly read directory
818          * entries.  By forcing the blocksize in this way, we ensure
819          * that we will never be required to do this.
820          */
821         sb_set_blocksize(s, orig_zonesize);
822 
823         sbi->s_nls_iocharset = NULL;
824 
825 #ifdef CONFIG_JOLIET
826         if (joliet_level && opt.utf8 == 0) {
827                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
828                 sbi->s_nls_iocharset = load_nls(p);
829                 if (! sbi->s_nls_iocharset) {
830                         /* Fail only if explicit charset specified */
831                         if (opt.iocharset)
832                                 goto out_freesbi;
833                         sbi->s_nls_iocharset = load_nls_default();
834                 }
835         }
836 #endif
837         s->s_op = &isofs_sops;
838         s->s_export_op = &isofs_export_ops;
839         sbi->s_mapping = opt.map;
840         sbi->s_rock = (opt.rock ? 2 : 0);
841         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
842         sbi->s_cruft = opt.cruft;
843         sbi->s_hide = opt.hide;
844         sbi->s_showassoc = opt.showassoc;
845         sbi->s_uid = opt.uid;
846         sbi->s_gid = opt.gid;
847         sbi->s_uid_set = opt.uid_set;
848         sbi->s_gid_set = opt.gid_set;
849         sbi->s_utf8 = opt.utf8;
850         sbi->s_nocompress = opt.nocompress;
851         sbi->s_overriderockperm = opt.overriderockperm;
852         /*
853          * It would be incredibly stupid to allow people to mark every file
854          * on the disk as suid, so we merely allow them to set the default
855          * permissions.
856          */
857         if (opt.fmode != ISOFS_INVALID_MODE)
858                 sbi->s_fmode = opt.fmode & 0777;
859         else
860                 sbi->s_fmode = ISOFS_INVALID_MODE;
861         if (opt.dmode != ISOFS_INVALID_MODE)
862                 sbi->s_dmode = opt.dmode & 0777;
863         else
864                 sbi->s_dmode = ISOFS_INVALID_MODE;
865 
866         /*
867          * Read the root inode, which _may_ result in changing
868          * the s_rock flag. Once we have the final s_rock value,
869          * we then decide whether to use the Joliet descriptor.
870          */
871         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
872         if (IS_ERR(inode))
873                 goto out_no_root;
874 
875         /*
876          * Fix for broken CDs with Rock Ridge and empty ISO root directory but
877          * correct Joliet root directory.
878          */
879         if (sbi->s_rock == 1 && joliet_level &&
880                                 rootdir_empty(s, sbi->s_firstdatazone)) {
881                 printk(KERN_NOTICE
882                         "ISOFS: primary root directory is empty. "
883                         "Disabling Rock Ridge and switching to Joliet.");
884                 sbi->s_rock = 0;
885         }
886 
887         /*
888          * If this disk has both Rock Ridge and Joliet on it, then we
889          * want to use Rock Ridge by default.  This can be overridden
890          * by using the norock mount option.  There is still one other
891          * possibility that is not taken into account: a Rock Ridge
892          * CD with Unicode names.  Until someone sees such a beast, it
893          * will not be supported.
894          */
895         if (sbi->s_rock == 1) {
896                 joliet_level = 0;
897         } else if (joliet_level) {
898                 sbi->s_rock = 0;
899                 if (sbi->s_firstdatazone != first_data_zone) {
900                         sbi->s_firstdatazone = first_data_zone;
901                         printk(KERN_DEBUG
902                                 "ISOFS: changing to secondary root\n");
903                         iput(inode);
904                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
905                         if (IS_ERR(inode))
906                                 goto out_no_root;
907                 }
908         }
909 
910         if (opt.check == 'u') {
911                 /* Only Joliet is case insensitive by default */
912                 if (joliet_level)
913                         opt.check = 'r';
914                 else
915                         opt.check = 's';
916         }
917         sbi->s_joliet_level = joliet_level;
918 
919         /* Make sure the root inode is a directory */
920         if (!S_ISDIR(inode->i_mode)) {
921                 printk(KERN_WARNING
922                         "isofs_fill_super: root inode is not a directory. "
923                         "Corrupted media?\n");
924                 goto out_iput;
925         }
926 
927         table = 0;
928         if (joliet_level)
929                 table += 2;
930         if (opt.check == 'r')
931                 table++;
932 
933         s->s_d_op = &isofs_dentry_ops[table];
934 
935         /* get the root dentry */
936         s->s_root = d_make_root(inode);
937         if (!(s->s_root)) {
938                 error = -ENOMEM;
939                 goto out_no_inode;
940         }
941 
942         kfree(opt.iocharset);
943 
944         return 0;
945 
946         /*
947          * Display error messages and free resources.
948          */
949 out_iput:
950         iput(inode);
951         goto out_no_inode;
952 out_no_root:
953         error = PTR_ERR(inode);
954         if (error != -ENOMEM)
955                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
956 out_no_inode:
957 #ifdef CONFIG_JOLIET
958         unload_nls(sbi->s_nls_iocharset);
959 #endif
960         goto out_freesbi;
961 out_no_read:
962         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
963                 __func__, s->s_id, iso_blknum, block);
964         goto out_freebh;
965 out_bad_zone_size:
966         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
967                 sbi->s_log_zone_size);
968         goto out_freebh;
969 out_bad_size:
970         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
971                 orig_zonesize, opt.blocksize);
972         goto out_freebh;
973 out_unknown_format:
974         if (!silent)
975                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
976 
977 out_freebh:
978         brelse(bh);
979         brelse(pri_bh);
980 out_freesbi:
981         kfree(opt.iocharset);
982         kfree(sbi);
983         s->s_fs_info = NULL;
984         return error;
985 }
986 
987 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
988 {
989         struct super_block *sb = dentry->d_sb;
990         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
991 
992         buf->f_type = ISOFS_SUPER_MAGIC;
993         buf->f_bsize = sb->s_blocksize;
994         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
995                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
996         buf->f_bfree = 0;
997         buf->f_bavail = 0;
998         buf->f_files = ISOFS_SB(sb)->s_ninodes;
999         buf->f_ffree = 0;
1000         buf->f_fsid.val[0] = (u32)id;
1001         buf->f_fsid.val[1] = (u32)(id >> 32);
1002         buf->f_namelen = NAME_MAX;
1003         return 0;
1004 }
1005 
1006 /*
1007  * Get a set of blocks; filling in buffer_heads if already allocated
1008  * or getblk() if they are not.  Returns the number of blocks inserted
1009  * (-ve == error.)
1010  */
1011 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1012                      struct buffer_head **bh, unsigned long nblocks)
1013 {
1014         unsigned long b_off = iblock;
1015         unsigned offset, sect_size;
1016         unsigned int firstext;
1017         unsigned long nextblk, nextoff;
1018         int section, rv, error;
1019         struct iso_inode_info *ei = ISOFS_I(inode);
1020 
1021         error = -EIO;
1022         rv = 0;
1023         if (iblock != b_off) {
1024                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1025                 goto abort;
1026         }
1027 
1028 
1029         offset = 0;
1030         firstext = ei->i_first_extent;
1031         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1032         nextblk = ei->i_next_section_block;
1033         nextoff = ei->i_next_section_offset;
1034         section = 0;
1035 
1036         while (nblocks) {
1037                 /* If we are *way* beyond the end of the file, print a message.
1038                  * Access beyond the end of the file up to the next page boundary
1039                  * is normal, however because of the way the page cache works.
1040                  * In this case, we just return 0 so that we can properly fill
1041                  * the page with useless information without generating any
1042                  * I/O errors.
1043                  */
1044                 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1045                         printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1046                                 __func__, b_off,
1047                                 (unsigned long long)inode->i_size);
1048                         goto abort;
1049                 }
1050 
1051                 /* On the last section, nextblk == 0, section size is likely to
1052                  * exceed sect_size by a partial block, and access beyond the
1053                  * end of the file will reach beyond the section size, too.
1054                  */
1055                 while (nextblk && (b_off >= (offset + sect_size))) {
1056                         struct inode *ninode;
1057 
1058                         offset += sect_size;
1059                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1060                         if (IS_ERR(ninode)) {
1061                                 error = PTR_ERR(ninode);
1062                                 goto abort;
1063                         }
1064                         firstext  = ISOFS_I(ninode)->i_first_extent;
1065                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1066                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1067                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1068                         iput(ninode);
1069 
1070                         if (++section > 100) {
1071                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1072                                         " aborting...\n", __func__);
1073                                 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1074                                         "nextblk=%lu nextoff=%lu\n", __func__,
1075                                         b_off, firstext, (unsigned) sect_size,
1076                                         nextblk, nextoff);
1077                                 goto abort;
1078                         }
1079                 }
1080 
1081                 if (*bh) {
1082                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1083                 } else {
1084                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1085                         if (!*bh)
1086                                 goto abort;
1087                 }
1088                 bh++;   /* Next buffer head */
1089                 b_off++;        /* Next buffer offset */
1090                 nblocks--;
1091                 rv++;
1092         }
1093 
1094         error = 0;
1095 abort:
1096         return rv != 0 ? rv : error;
1097 }
1098 
1099 /*
1100  * Used by the standard interfaces.
1101  */
1102 static int isofs_get_block(struct inode *inode, sector_t iblock,
1103                     struct buffer_head *bh_result, int create)
1104 {
1105         int ret;
1106 
1107         if (create) {
1108                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1109                 return -EROFS;
1110         }
1111 
1112         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1113         return ret < 0 ? ret : 0;
1114 }
1115 
1116 static int isofs_bmap(struct inode *inode, sector_t block)
1117 {
1118         struct buffer_head dummy;
1119         int error;
1120 
1121         dummy.b_state = 0;
1122         dummy.b_blocknr = -1000;
1123         error = isofs_get_block(inode, block, &dummy, 0);
1124         if (!error)
1125                 return dummy.b_blocknr;
1126         return 0;
1127 }
1128 
1129 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1130 {
1131         sector_t blknr = isofs_bmap(inode, block);
1132         if (!blknr)
1133                 return NULL;
1134         return sb_bread(inode->i_sb, blknr);
1135 }
1136 
1137 static int isofs_readpage(struct file *file, struct page *page)
1138 {
1139         return mpage_readpage(page, isofs_get_block);
1140 }
1141 
1142 static int isofs_readpages(struct file *file, struct address_space *mapping,
1143                         struct list_head *pages, unsigned nr_pages)
1144 {
1145         return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1146 }
1147 
1148 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1149 {
1150         return generic_block_bmap(mapping,block,isofs_get_block);
1151 }
1152 
1153 static const struct address_space_operations isofs_aops = {
1154         .readpage = isofs_readpage,
1155         .readpages = isofs_readpages,
1156         .bmap = _isofs_bmap
1157 };
1158 
1159 static int isofs_read_level3_size(struct inode *inode)
1160 {
1161         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1162         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1163         struct buffer_head *bh = NULL;
1164         unsigned long block, offset, block_saved, offset_saved;
1165         int i = 0;
1166         int more_entries = 0;
1167         struct iso_directory_record *tmpde = NULL;
1168         struct iso_inode_info *ei = ISOFS_I(inode);
1169 
1170         inode->i_size = 0;
1171 
1172         /* The first 16 blocks are reserved as the System Area.  Thus,
1173          * no inodes can appear in block 0.  We use this to flag that
1174          * this is the last section. */
1175         ei->i_next_section_block = 0;
1176         ei->i_next_section_offset = 0;
1177 
1178         block = ei->i_iget5_block;
1179         offset = ei->i_iget5_offset;
1180 
1181         do {
1182                 struct iso_directory_record *de;
1183                 unsigned int de_len;
1184 
1185                 if (!bh) {
1186                         bh = sb_bread(inode->i_sb, block);
1187                         if (!bh)
1188                                 goto out_noread;
1189                 }
1190                 de = (struct iso_directory_record *) (bh->b_data + offset);
1191                 de_len = *(unsigned char *) de;
1192 
1193                 if (de_len == 0) {
1194                         brelse(bh);
1195                         bh = NULL;
1196                         ++block;
1197                         offset = 0;
1198                         continue;
1199                 }
1200 
1201                 block_saved = block;
1202                 offset_saved = offset;
1203                 offset += de_len;
1204 
1205                 /* Make sure we have a full directory entry */
1206                 if (offset >= bufsize) {
1207                         int slop = bufsize - offset + de_len;
1208                         if (!tmpde) {
1209                                 tmpde = kmalloc(256, GFP_KERNEL);
1210                                 if (!tmpde)
1211                                         goto out_nomem;
1212                         }
1213                         memcpy(tmpde, de, slop);
1214                         offset &= bufsize - 1;
1215                         block++;
1216                         brelse(bh);
1217                         bh = NULL;
1218                         if (offset) {
1219                                 bh = sb_bread(inode->i_sb, block);
1220                                 if (!bh)
1221                                         goto out_noread;
1222                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1223                         }
1224                         de = tmpde;
1225                 }
1226 
1227                 inode->i_size += isonum_733(de->size);
1228                 if (i == 1) {
1229                         ei->i_next_section_block = block_saved;
1230                         ei->i_next_section_offset = offset_saved;
1231                 }
1232 
1233                 more_entries = de->flags[-high_sierra] & 0x80;
1234 
1235                 i++;
1236                 if (i > 100)
1237                         goto out_toomany;
1238         } while (more_entries);
1239 out:
1240         kfree(tmpde);
1241         if (bh)
1242                 brelse(bh);
1243         return 0;
1244 
1245 out_nomem:
1246         if (bh)
1247                 brelse(bh);
1248         return -ENOMEM;
1249 
1250 out_noread:
1251         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1252         kfree(tmpde);
1253         return -EIO;
1254 
1255 out_toomany:
1256         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1257                 "isofs_read_level3_size: inode=%lu\n",
1258                 __func__, inode->i_ino);
1259         goto out;
1260 }
1261 
1262 static int isofs_read_inode(struct inode *inode)
1263 {
1264         struct super_block *sb = inode->i_sb;
1265         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1266         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1267         unsigned long block;
1268         int high_sierra = sbi->s_high_sierra;
1269         struct buffer_head *bh = NULL;
1270         struct iso_directory_record *de;
1271         struct iso_directory_record *tmpde = NULL;
1272         unsigned int de_len;
1273         unsigned long offset;
1274         struct iso_inode_info *ei = ISOFS_I(inode);
1275         int ret = -EIO;
1276 
1277         block = ei->i_iget5_block;
1278         bh = sb_bread(inode->i_sb, block);
1279         if (!bh)
1280                 goto out_badread;
1281 
1282         offset = ei->i_iget5_offset;
1283 
1284         de = (struct iso_directory_record *) (bh->b_data + offset);
1285         de_len = *(unsigned char *) de;
1286 
1287         if (offset + de_len > bufsize) {
1288                 int frag1 = bufsize - offset;
1289 
1290                 tmpde = kmalloc(de_len, GFP_KERNEL);
1291                 if (tmpde == NULL) {
1292                         printk(KERN_INFO "%s: out of memory\n", __func__);
1293                         ret = -ENOMEM;
1294                         goto fail;
1295                 }
1296                 memcpy(tmpde, bh->b_data + offset, frag1);
1297                 brelse(bh);
1298                 bh = sb_bread(inode->i_sb, ++block);
1299                 if (!bh)
1300                         goto out_badread;
1301                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1302                 de = tmpde;
1303         }
1304 
1305         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1306                                         ei->i_iget5_offset,
1307                                         ISOFS_BUFFER_BITS(inode));
1308 
1309         /* Assume it is a normal-format file unless told otherwise */
1310         ei->i_file_format = isofs_file_normal;
1311 
1312         if (de->flags[-high_sierra] & 2) {
1313                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1314                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1315                 else
1316                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1317                 set_nlink(inode, 1);    /*
1318                                          * Set to 1.  We know there are 2, but
1319                                          * the find utility tries to optimize
1320                                          * if it is 2, and it screws up.  It is
1321                                          * easier to give 1 which tells find to
1322                                          * do it the hard way.
1323                                          */
1324         } else {
1325                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1326                         inode->i_mode = S_IFREG | sbi->s_fmode;
1327                 } else {
1328                         /*
1329                          * Set default permissions: r-x for all.  The disc
1330                          * could be shared with DOS machines so virtually
1331                          * anything could be a valid executable.
1332                          */
1333                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1334                 }
1335                 set_nlink(inode, 1);
1336         }
1337         inode->i_uid = sbi->s_uid;
1338         inode->i_gid = sbi->s_gid;
1339         inode->i_blocks = 0;
1340 
1341         ei->i_format_parm[0] = 0;
1342         ei->i_format_parm[1] = 0;
1343         ei->i_format_parm[2] = 0;
1344 
1345         ei->i_section_size = isonum_733(de->size);
1346         if (de->flags[-high_sierra] & 0x80) {
1347                 ret = isofs_read_level3_size(inode);
1348                 if (ret < 0)
1349                         goto fail;
1350                 ret = -EIO;
1351         } else {
1352                 ei->i_next_section_block = 0;
1353                 ei->i_next_section_offset = 0;
1354                 inode->i_size = isonum_733(de->size);
1355         }
1356 
1357         /*
1358          * Some dipshit decided to store some other bit of information
1359          * in the high byte of the file length.  Truncate size in case
1360          * this CDROM was mounted with the cruft option.
1361          */
1362 
1363         if (sbi->s_cruft)
1364                 inode->i_size &= 0x00ffffff;
1365 
1366         if (de->interleave[0]) {
1367                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1368                 inode->i_size = 0;
1369         }
1370 
1371         /* I have no idea what file_unit_size is used for, so
1372            we will flag it for now */
1373         if (de->file_unit_size[0] != 0) {
1374                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1375                         inode->i_ino);
1376         }
1377 
1378         /* I have no idea what other flag bits are used for, so
1379            we will flag it for now */
1380 #ifdef DEBUG
1381         if((de->flags[-high_sierra] & ~2)!= 0){
1382                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1383                                 "(%ld %x).\n",
1384                         inode->i_ino, de->flags[-high_sierra]);
1385         }
1386 #endif
1387 
1388         inode->i_mtime.tv_sec =
1389         inode->i_atime.tv_sec =
1390         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1391         inode->i_mtime.tv_nsec =
1392         inode->i_atime.tv_nsec =
1393         inode->i_ctime.tv_nsec = 0;
1394 
1395         ei->i_first_extent = (isonum_733(de->extent) +
1396                         isonum_711(de->ext_attr_length));
1397 
1398         /* Set the number of blocks for stat() - should be done before RR */
1399         inode->i_blocks = (inode->i_size + 511) >> 9;
1400 
1401         /*
1402          * Now test for possible Rock Ridge extensions which will override
1403          * some of these numbers in the inode structure.
1404          */
1405 
1406         if (!high_sierra) {
1407                 parse_rock_ridge_inode(de, inode);
1408                 /* if we want uid/gid set, override the rock ridge setting */
1409                 if (sbi->s_uid_set)
1410                         inode->i_uid = sbi->s_uid;
1411                 if (sbi->s_gid_set)
1412                         inode->i_gid = sbi->s_gid;
1413         }
1414         /* Now set final access rights if overriding rock ridge setting */
1415         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1416             sbi->s_dmode != ISOFS_INVALID_MODE)
1417                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1418         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1419             sbi->s_fmode != ISOFS_INVALID_MODE)
1420                 inode->i_mode = S_IFREG | sbi->s_fmode;
1421 
1422         /* Install the inode operations vector */
1423         if (S_ISREG(inode->i_mode)) {
1424                 inode->i_fop = &generic_ro_fops;
1425                 switch (ei->i_file_format) {
1426 #ifdef CONFIG_ZISOFS
1427                 case isofs_file_compressed:
1428                         inode->i_data.a_ops = &zisofs_aops;
1429                         break;
1430 #endif
1431                 default:
1432                         inode->i_data.a_ops = &isofs_aops;
1433                         break;
1434                 }
1435         } else if (S_ISDIR(inode->i_mode)) {
1436                 inode->i_op = &isofs_dir_inode_operations;
1437                 inode->i_fop = &isofs_dir_operations;
1438         } else if (S_ISLNK(inode->i_mode)) {
1439                 inode->i_op = &page_symlink_inode_operations;
1440                 inode->i_data.a_ops = &isofs_symlink_aops;
1441         } else
1442                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1443                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1444 
1445         ret = 0;
1446 out:
1447         kfree(tmpde);
1448         if (bh)
1449                 brelse(bh);
1450         return ret;
1451 
1452 out_badread:
1453         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1454 fail:
1455         goto out;
1456 }
1457 
1458 struct isofs_iget5_callback_data {
1459         unsigned long block;
1460         unsigned long offset;
1461 };
1462 
1463 static int isofs_iget5_test(struct inode *ino, void *data)
1464 {
1465         struct iso_inode_info *i = ISOFS_I(ino);
1466         struct isofs_iget5_callback_data *d =
1467                 (struct isofs_iget5_callback_data*)data;
1468         return (i->i_iget5_block == d->block)
1469                 && (i->i_iget5_offset == d->offset);
1470 }
1471 
1472 static int isofs_iget5_set(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         i->i_iget5_block = d->block;
1478         i->i_iget5_offset = d->offset;
1479         return 0;
1480 }
1481 
1482 /* Store, in the inode's containing structure, the block and block
1483  * offset that point to the underlying meta-data for the inode.  The
1484  * code below is otherwise similar to the iget() code in
1485  * include/linux/fs.h */
1486 struct inode *isofs_iget(struct super_block *sb,
1487                          unsigned long block,
1488                          unsigned long offset)
1489 {
1490         unsigned long hashval;
1491         struct inode *inode;
1492         struct isofs_iget5_callback_data data;
1493         long ret;
1494 
1495         if (offset >= 1ul << sb->s_blocksize_bits)
1496                 return ERR_PTR(-EINVAL);
1497 
1498         data.block = block;
1499         data.offset = offset;
1500 
1501         hashval = (block << sb->s_blocksize_bits) | offset;
1502 
1503         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1504                                 &isofs_iget5_set, &data);
1505 
1506         if (!inode)
1507                 return ERR_PTR(-ENOMEM);
1508 
1509         if (inode->i_state & I_NEW) {
1510                 ret = isofs_read_inode(inode);
1511                 if (ret < 0) {
1512                         iget_failed(inode);
1513                         inode = ERR_PTR(ret);
1514                 } else {
1515                         unlock_new_inode(inode);
1516                 }
1517         }
1518 
1519         return inode;
1520 }
1521 
1522 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1523         int flags, const char *dev_name, void *data)
1524 {
1525         /* We don't support read-write mounts */
1526         if (!(flags & MS_RDONLY))
1527                 return ERR_PTR(-EACCES);
1528         return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1529 }
1530 
1531 static struct file_system_type iso9660_fs_type = {
1532         .owner          = THIS_MODULE,
1533         .name           = "iso9660",
1534         .mount          = isofs_mount,
1535         .kill_sb        = kill_block_super,
1536         .fs_flags       = FS_REQUIRES_DEV,
1537 };
1538 MODULE_ALIAS_FS("iso9660");
1539 MODULE_ALIAS("iso9660");
1540 
1541 static int __init init_iso9660_fs(void)
1542 {
1543         int err = init_inodecache();
1544         if (err)
1545                 goto out;
1546 #ifdef CONFIG_ZISOFS
1547         err = zisofs_init();
1548         if (err)
1549                 goto out1;
1550 #endif
1551         err = register_filesystem(&iso9660_fs_type);
1552         if (err)
1553                 goto out2;
1554         return 0;
1555 out2:
1556 #ifdef CONFIG_ZISOFS
1557         zisofs_cleanup();
1558 out1:
1559 #endif
1560         destroy_inodecache();
1561 out:
1562         return err;
1563 }
1564 
1565 static void __exit exit_iso9660_fs(void)
1566 {
1567         unregister_filesystem(&iso9660_fs_type);
1568 #ifdef CONFIG_ZISOFS
1569         zisofs_cleanup();
1570 #endif
1571         destroy_inodecache();
1572 }
1573 
1574 module_init(init_iso9660_fs)
1575 module_exit(exit_iso9660_fs)
1576 MODULE_LICENSE("GPL");
1577 

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