Version:  2.0.40 2.2.26 2.4.37 3.11 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

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 
691         if (joliet_level && (pri == NULL || !opt.rock)) {
692                 /* This is the case of Joliet with the norock mount flag.
693                  * A disc with both Joliet and Rock Ridge is handled later
694                  */
695                 pri = (struct iso_primary_descriptor *) sec;
696         }
697 
698         if(sbi->s_high_sierra){
699                 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
700                 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
701                 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
702                 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
703         } else {
704                 if (!pri)
705                         goto out_freebh;
706                 rootp = (struct iso_directory_record *) pri->root_directory_record;
707                 sbi->s_nzones = isonum_733(pri->volume_space_size);
708                 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
709                 sbi->s_max_size = isonum_733(pri->volume_space_size);
710         }
711 
712         sbi->s_ninodes = 0; /* No way to figure this out easily */
713 
714         orig_zonesize = sbi->s_log_zone_size;
715         /*
716          * If the zone size is smaller than the hardware sector size,
717          * this is a fatal error.  This would occur if the disc drive
718          * had sectors that were 2048 bytes, but the filesystem had
719          * blocks that were 512 bytes (which should only very rarely
720          * happen.)
721          */
722         if (orig_zonesize < opt.blocksize)
723                 goto out_bad_size;
724 
725         /* RDE: convert log zone size to bit shift */
726         switch (sbi->s_log_zone_size) {
727         case  512: sbi->s_log_zone_size =  9; break;
728         case 1024: sbi->s_log_zone_size = 10; break;
729         case 2048: sbi->s_log_zone_size = 11; break;
730 
731         default:
732                 goto out_bad_zone_size;
733         }
734 
735         s->s_magic = ISOFS_SUPER_MAGIC;
736 
737         /*
738          * With multi-extent files, file size is only limited by the maximum
739          * size of a file system, which is 8 TB.
740          */
741         s->s_maxbytes = 0x80000000000LL;
742 
743         /* Set this for reference. Its not currently used except on write
744            which we don't have .. */
745 
746         first_data_zone = isonum_733(rootp->extent) +
747                           isonum_711(rootp->ext_attr_length);
748         sbi->s_firstdatazone = first_data_zone;
749 #ifndef BEQUIET
750         printk(KERN_DEBUG "ISOFS: Max size:%ld   Log zone size:%ld\n",
751                 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
752         printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
753         if(sbi->s_high_sierra)
754                 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
755 #endif
756 
757         /*
758          * If the Joliet level is set, we _may_ decide to use the
759          * secondary descriptor, but can't be sure until after we
760          * read the root inode. But before reading the root inode
761          * we may need to change the device blocksize, and would
762          * rather release the old buffer first. So, we cache the
763          * first_data_zone value from the secondary descriptor.
764          */
765         if (joliet_level) {
766                 pri = (struct iso_primary_descriptor *) sec;
767                 rootp = (struct iso_directory_record *)
768                         pri->root_directory_record;
769                 first_data_zone = isonum_733(rootp->extent) +
770                                 isonum_711(rootp->ext_attr_length);
771         }
772 
773         /*
774          * We're all done using the volume descriptor, and may need
775          * to change the device blocksize, so release the buffer now.
776          */
777         brelse(pri_bh);
778         brelse(bh);
779 
780         /*
781          * Force the blocksize to 512 for 512 byte sectors.  The file
782          * read primitives really get it wrong in a bad way if we don't
783          * do this.
784          *
785          * Note - we should never be setting the blocksize to something
786          * less than the hardware sector size for the device.  If we
787          * do, we would end up having to read larger buffers and split
788          * out portions to satisfy requests.
789          *
790          * Note2- the idea here is that we want to deal with the optimal
791          * zonesize in the filesystem.  If we have it set to something less,
792          * then we have horrible problems with trying to piece together
793          * bits of adjacent blocks in order to properly read directory
794          * entries.  By forcing the blocksize in this way, we ensure
795          * that we will never be required to do this.
796          */
797         sb_set_blocksize(s, orig_zonesize);
798 
799         sbi->s_nls_iocharset = NULL;
800 
801 #ifdef CONFIG_JOLIET
802         if (joliet_level && opt.utf8 == 0) {
803                 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
804                 sbi->s_nls_iocharset = load_nls(p);
805                 if (! sbi->s_nls_iocharset) {
806                         /* Fail only if explicit charset specified */
807                         if (opt.iocharset)
808                                 goto out_freesbi;
809                         sbi->s_nls_iocharset = load_nls_default();
810                 }
811         }
812 #endif
813         s->s_op = &isofs_sops;
814         s->s_export_op = &isofs_export_ops;
815         sbi->s_mapping = opt.map;
816         sbi->s_rock = (opt.rock ? 2 : 0);
817         sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
818         sbi->s_cruft = opt.cruft;
819         sbi->s_hide = opt.hide;
820         sbi->s_showassoc = opt.showassoc;
821         sbi->s_uid = opt.uid;
822         sbi->s_gid = opt.gid;
823         sbi->s_uid_set = opt.uid_set;
824         sbi->s_gid_set = opt.gid_set;
825         sbi->s_utf8 = opt.utf8;
826         sbi->s_nocompress = opt.nocompress;
827         sbi->s_overriderockperm = opt.overriderockperm;
828         /*
829          * It would be incredibly stupid to allow people to mark every file
830          * on the disk as suid, so we merely allow them to set the default
831          * permissions.
832          */
833         if (opt.fmode != ISOFS_INVALID_MODE)
834                 sbi->s_fmode = opt.fmode & 0777;
835         else
836                 sbi->s_fmode = ISOFS_INVALID_MODE;
837         if (opt.dmode != ISOFS_INVALID_MODE)
838                 sbi->s_dmode = opt.dmode & 0777;
839         else
840                 sbi->s_dmode = ISOFS_INVALID_MODE;
841 
842         /*
843          * Read the root inode, which _may_ result in changing
844          * the s_rock flag. Once we have the final s_rock value,
845          * we then decide whether to use the Joliet descriptor.
846          */
847         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
848         if (IS_ERR(inode))
849                 goto out_no_root;
850 
851         /*
852          * Fix for broken CDs with Rock Ridge and empty ISO root directory but
853          * correct Joliet root directory.
854          */
855         if (sbi->s_rock == 1 && joliet_level &&
856                                 rootdir_empty(s, sbi->s_firstdatazone)) {
857                 printk(KERN_NOTICE
858                         "ISOFS: primary root directory is empty. "
859                         "Disabling Rock Ridge and switching to Joliet.");
860                 sbi->s_rock = 0;
861         }
862 
863         /*
864          * If this disk has both Rock Ridge and Joliet on it, then we
865          * want to use Rock Ridge by default.  This can be overridden
866          * by using the norock mount option.  There is still one other
867          * possibility that is not taken into account: a Rock Ridge
868          * CD with Unicode names.  Until someone sees such a beast, it
869          * will not be supported.
870          */
871         if (sbi->s_rock == 1) {
872                 joliet_level = 0;
873         } else if (joliet_level) {
874                 sbi->s_rock = 0;
875                 if (sbi->s_firstdatazone != first_data_zone) {
876                         sbi->s_firstdatazone = first_data_zone;
877                         printk(KERN_DEBUG
878                                 "ISOFS: changing to secondary root\n");
879                         iput(inode);
880                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
881                         if (IS_ERR(inode))
882                                 goto out_no_root;
883                 }
884         }
885 
886         if (opt.check == 'u') {
887                 /* Only Joliet is case insensitive by default */
888                 if (joliet_level)
889                         opt.check = 'r';
890                 else
891                         opt.check = 's';
892         }
893         sbi->s_joliet_level = joliet_level;
894 
895         /* Make sure the root inode is a directory */
896         if (!S_ISDIR(inode->i_mode)) {
897                 printk(KERN_WARNING
898                         "isofs_fill_super: root inode is not a directory. "
899                         "Corrupted media?\n");
900                 goto out_iput;
901         }
902 
903         table = 0;
904         if (joliet_level)
905                 table += 2;
906         if (opt.check == 'r')
907                 table++;
908 
909         if (table)
910                 s->s_d_op = &isofs_dentry_ops[table - 1];
911 
912         /* get the root dentry */
913         s->s_root = d_make_root(inode);
914         if (!(s->s_root)) {
915                 error = -ENOMEM;
916                 goto out_no_inode;
917         }
918 
919         kfree(opt.iocharset);
920 
921         return 0;
922 
923         /*
924          * Display error messages and free resources.
925          */
926 out_iput:
927         iput(inode);
928         goto out_no_inode;
929 out_no_root:
930         error = PTR_ERR(inode);
931         if (error != -ENOMEM)
932                 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
933 out_no_inode:
934 #ifdef CONFIG_JOLIET
935         unload_nls(sbi->s_nls_iocharset);
936 #endif
937         goto out_freesbi;
938 out_no_read:
939         printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
940                 __func__, s->s_id, iso_blknum, block);
941         goto out_freebh;
942 out_bad_zone_size:
943         printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
944                 sbi->s_log_zone_size);
945         goto out_freebh;
946 out_bad_size:
947         printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
948                 orig_zonesize, opt.blocksize);
949         goto out_freebh;
950 out_unknown_format:
951         if (!silent)
952                 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
953 
954 out_freebh:
955         brelse(bh);
956         brelse(pri_bh);
957 out_freesbi:
958         kfree(opt.iocharset);
959         kfree(sbi);
960         s->s_fs_info = NULL;
961         return error;
962 }
963 
964 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
965 {
966         struct super_block *sb = dentry->d_sb;
967         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
968 
969         buf->f_type = ISOFS_SUPER_MAGIC;
970         buf->f_bsize = sb->s_blocksize;
971         buf->f_blocks = (ISOFS_SB(sb)->s_nzones
972                 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
973         buf->f_bfree = 0;
974         buf->f_bavail = 0;
975         buf->f_files = ISOFS_SB(sb)->s_ninodes;
976         buf->f_ffree = 0;
977         buf->f_fsid.val[0] = (u32)id;
978         buf->f_fsid.val[1] = (u32)(id >> 32);
979         buf->f_namelen = NAME_MAX;
980         return 0;
981 }
982 
983 /*
984  * Get a set of blocks; filling in buffer_heads if already allocated
985  * or getblk() if they are not.  Returns the number of blocks inserted
986  * (-ve == error.)
987  */
988 int isofs_get_blocks(struct inode *inode, sector_t iblock,
989                      struct buffer_head **bh, unsigned long nblocks)
990 {
991         unsigned long b_off = iblock;
992         unsigned offset, sect_size;
993         unsigned int firstext;
994         unsigned long nextblk, nextoff;
995         int section, rv, error;
996         struct iso_inode_info *ei = ISOFS_I(inode);
997 
998         error = -EIO;
999         rv = 0;
1000         if (iblock != b_off) {
1001                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1002                 goto abort;
1003         }
1004 
1005 
1006         offset = 0;
1007         firstext = ei->i_first_extent;
1008         sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1009         nextblk = ei->i_next_section_block;
1010         nextoff = ei->i_next_section_offset;
1011         section = 0;
1012 
1013         while (nblocks) {
1014                 /* If we are *way* beyond the end of the file, print a message.
1015                  * Access beyond the end of the file up to the next page boundary
1016                  * is normal, however because of the way the page cache works.
1017                  * In this case, we just return 0 so that we can properly fill
1018                  * the page with useless information without generating any
1019                  * I/O errors.
1020                  */
1021                 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1022                         printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1023                                 __func__, b_off,
1024                                 (unsigned long long)inode->i_size);
1025                         goto abort;
1026                 }
1027 
1028                 /* On the last section, nextblk == 0, section size is likely to
1029                  * exceed sect_size by a partial block, and access beyond the
1030                  * end of the file will reach beyond the section size, too.
1031                  */
1032                 while (nextblk && (b_off >= (offset + sect_size))) {
1033                         struct inode *ninode;
1034 
1035                         offset += sect_size;
1036                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1037                         if (IS_ERR(ninode)) {
1038                                 error = PTR_ERR(ninode);
1039                                 goto abort;
1040                         }
1041                         firstext  = ISOFS_I(ninode)->i_first_extent;
1042                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1043                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
1044                         nextoff   = ISOFS_I(ninode)->i_next_section_offset;
1045                         iput(ninode);
1046 
1047                         if (++section > 100) {
1048                                 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1049                                         " aborting...\n", __func__);
1050                                 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1051                                         "nextblk=%lu nextoff=%lu\n", __func__,
1052                                         b_off, firstext, (unsigned) sect_size,
1053                                         nextblk, nextoff);
1054                                 goto abort;
1055                         }
1056                 }
1057 
1058                 if (*bh) {
1059                         map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1060                 } else {
1061                         *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1062                         if (!*bh)
1063                                 goto abort;
1064                 }
1065                 bh++;   /* Next buffer head */
1066                 b_off++;        /* Next buffer offset */
1067                 nblocks--;
1068                 rv++;
1069         }
1070 
1071         error = 0;
1072 abort:
1073         return rv != 0 ? rv : error;
1074 }
1075 
1076 /*
1077  * Used by the standard interfaces.
1078  */
1079 static int isofs_get_block(struct inode *inode, sector_t iblock,
1080                     struct buffer_head *bh_result, int create)
1081 {
1082         int ret;
1083 
1084         if (create) {
1085                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1086                 return -EROFS;
1087         }
1088 
1089         ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1090         return ret < 0 ? ret : 0;
1091 }
1092 
1093 static int isofs_bmap(struct inode *inode, sector_t block)
1094 {
1095         struct buffer_head dummy;
1096         int error;
1097 
1098         dummy.b_state = 0;
1099         dummy.b_blocknr = -1000;
1100         error = isofs_get_block(inode, block, &dummy, 0);
1101         if (!error)
1102                 return dummy.b_blocknr;
1103         return 0;
1104 }
1105 
1106 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1107 {
1108         sector_t blknr = isofs_bmap(inode, block);
1109         if (!blknr)
1110                 return NULL;
1111         return sb_bread(inode->i_sb, blknr);
1112 }
1113 
1114 static int isofs_readpage(struct file *file, struct page *page)
1115 {
1116         return mpage_readpage(page, isofs_get_block);
1117 }
1118 
1119 static int isofs_readpages(struct file *file, struct address_space *mapping,
1120                         struct list_head *pages, unsigned nr_pages)
1121 {
1122         return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1123 }
1124 
1125 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1126 {
1127         return generic_block_bmap(mapping,block,isofs_get_block);
1128 }
1129 
1130 static const struct address_space_operations isofs_aops = {
1131         .readpage = isofs_readpage,
1132         .readpages = isofs_readpages,
1133         .bmap = _isofs_bmap
1134 };
1135 
1136 static int isofs_read_level3_size(struct inode *inode)
1137 {
1138         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1139         int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1140         struct buffer_head *bh = NULL;
1141         unsigned long block, offset, block_saved, offset_saved;
1142         int i = 0;
1143         int more_entries = 0;
1144         struct iso_directory_record *tmpde = NULL;
1145         struct iso_inode_info *ei = ISOFS_I(inode);
1146 
1147         inode->i_size = 0;
1148 
1149         /* The first 16 blocks are reserved as the System Area.  Thus,
1150          * no inodes can appear in block 0.  We use this to flag that
1151          * this is the last section. */
1152         ei->i_next_section_block = 0;
1153         ei->i_next_section_offset = 0;
1154 
1155         block = ei->i_iget5_block;
1156         offset = ei->i_iget5_offset;
1157 
1158         do {
1159                 struct iso_directory_record *de;
1160                 unsigned int de_len;
1161 
1162                 if (!bh) {
1163                         bh = sb_bread(inode->i_sb, block);
1164                         if (!bh)
1165                                 goto out_noread;
1166                 }
1167                 de = (struct iso_directory_record *) (bh->b_data + offset);
1168                 de_len = *(unsigned char *) de;
1169 
1170                 if (de_len == 0) {
1171                         brelse(bh);
1172                         bh = NULL;
1173                         ++block;
1174                         offset = 0;
1175                         continue;
1176                 }
1177 
1178                 block_saved = block;
1179                 offset_saved = offset;
1180                 offset += de_len;
1181 
1182                 /* Make sure we have a full directory entry */
1183                 if (offset >= bufsize) {
1184                         int slop = bufsize - offset + de_len;
1185                         if (!tmpde) {
1186                                 tmpde = kmalloc(256, GFP_KERNEL);
1187                                 if (!tmpde)
1188                                         goto out_nomem;
1189                         }
1190                         memcpy(tmpde, de, slop);
1191                         offset &= bufsize - 1;
1192                         block++;
1193                         brelse(bh);
1194                         bh = NULL;
1195                         if (offset) {
1196                                 bh = sb_bread(inode->i_sb, block);
1197                                 if (!bh)
1198                                         goto out_noread;
1199                                 memcpy((void *)tmpde+slop, bh->b_data, offset);
1200                         }
1201                         de = tmpde;
1202                 }
1203 
1204                 inode->i_size += isonum_733(de->size);
1205                 if (i == 1) {
1206                         ei->i_next_section_block = block_saved;
1207                         ei->i_next_section_offset = offset_saved;
1208                 }
1209 
1210                 more_entries = de->flags[-high_sierra] & 0x80;
1211 
1212                 i++;
1213                 if (i > 100)
1214                         goto out_toomany;
1215         } while (more_entries);
1216 out:
1217         kfree(tmpde);
1218         if (bh)
1219                 brelse(bh);
1220         return 0;
1221 
1222 out_nomem:
1223         if (bh)
1224                 brelse(bh);
1225         return -ENOMEM;
1226 
1227 out_noread:
1228         printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1229         kfree(tmpde);
1230         return -EIO;
1231 
1232 out_toomany:
1233         printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1234                 "isofs_read_level3_size: inode=%lu\n",
1235                 __func__, inode->i_ino);
1236         goto out;
1237 }
1238 
1239 static int isofs_read_inode(struct inode *inode, int relocated)
1240 {
1241         struct super_block *sb = inode->i_sb;
1242         struct isofs_sb_info *sbi = ISOFS_SB(sb);
1243         unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1244         unsigned long block;
1245         int high_sierra = sbi->s_high_sierra;
1246         struct buffer_head *bh = NULL;
1247         struct iso_directory_record *de;
1248         struct iso_directory_record *tmpde = NULL;
1249         unsigned int de_len;
1250         unsigned long offset;
1251         struct iso_inode_info *ei = ISOFS_I(inode);
1252         int ret = -EIO;
1253 
1254         block = ei->i_iget5_block;
1255         bh = sb_bread(inode->i_sb, block);
1256         if (!bh)
1257                 goto out_badread;
1258 
1259         offset = ei->i_iget5_offset;
1260 
1261         de = (struct iso_directory_record *) (bh->b_data + offset);
1262         de_len = *(unsigned char *) de;
1263 
1264         if (offset + de_len > bufsize) {
1265                 int frag1 = bufsize - offset;
1266 
1267                 tmpde = kmalloc(de_len, GFP_KERNEL);
1268                 if (tmpde == NULL) {
1269                         printk(KERN_INFO "%s: out of memory\n", __func__);
1270                         ret = -ENOMEM;
1271                         goto fail;
1272                 }
1273                 memcpy(tmpde, bh->b_data + offset, frag1);
1274                 brelse(bh);
1275                 bh = sb_bread(inode->i_sb, ++block);
1276                 if (!bh)
1277                         goto out_badread;
1278                 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1279                 de = tmpde;
1280         }
1281 
1282         inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1283                                         ei->i_iget5_offset,
1284                                         ISOFS_BUFFER_BITS(inode));
1285 
1286         /* Assume it is a normal-format file unless told otherwise */
1287         ei->i_file_format = isofs_file_normal;
1288 
1289         if (de->flags[-high_sierra] & 2) {
1290                 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1291                         inode->i_mode = S_IFDIR | sbi->s_dmode;
1292                 else
1293                         inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1294                 set_nlink(inode, 1);    /*
1295                                          * Set to 1.  We know there are 2, but
1296                                          * the find utility tries to optimize
1297                                          * if it is 2, and it screws up.  It is
1298                                          * easier to give 1 which tells find to
1299                                          * do it the hard way.
1300                                          */
1301         } else {
1302                 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1303                         inode->i_mode = S_IFREG | sbi->s_fmode;
1304                 } else {
1305                         /*
1306                          * Set default permissions: r-x for all.  The disc
1307                          * could be shared with DOS machines so virtually
1308                          * anything could be a valid executable.
1309                          */
1310                         inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1311                 }
1312                 set_nlink(inode, 1);
1313         }
1314         inode->i_uid = sbi->s_uid;
1315         inode->i_gid = sbi->s_gid;
1316         inode->i_blocks = 0;
1317 
1318         ei->i_format_parm[0] = 0;
1319         ei->i_format_parm[1] = 0;
1320         ei->i_format_parm[2] = 0;
1321 
1322         ei->i_section_size = isonum_733(de->size);
1323         if (de->flags[-high_sierra] & 0x80) {
1324                 ret = isofs_read_level3_size(inode);
1325                 if (ret < 0)
1326                         goto fail;
1327                 ret = -EIO;
1328         } else {
1329                 ei->i_next_section_block = 0;
1330                 ei->i_next_section_offset = 0;
1331                 inode->i_size = isonum_733(de->size);
1332         }
1333 
1334         /*
1335          * Some dipshit decided to store some other bit of information
1336          * in the high byte of the file length.  Truncate size in case
1337          * this CDROM was mounted with the cruft option.
1338          */
1339 
1340         if (sbi->s_cruft)
1341                 inode->i_size &= 0x00ffffff;
1342 
1343         if (de->interleave[0]) {
1344                 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1345                 inode->i_size = 0;
1346         }
1347 
1348         /* I have no idea what file_unit_size is used for, so
1349            we will flag it for now */
1350         if (de->file_unit_size[0] != 0) {
1351                 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1352                         inode->i_ino);
1353         }
1354 
1355         /* I have no idea what other flag bits are used for, so
1356            we will flag it for now */
1357 #ifdef DEBUG
1358         if((de->flags[-high_sierra] & ~2)!= 0){
1359                 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1360                                 "(%ld %x).\n",
1361                         inode->i_ino, de->flags[-high_sierra]);
1362         }
1363 #endif
1364 
1365         inode->i_mtime.tv_sec =
1366         inode->i_atime.tv_sec =
1367         inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1368         inode->i_mtime.tv_nsec =
1369         inode->i_atime.tv_nsec =
1370         inode->i_ctime.tv_nsec = 0;
1371 
1372         ei->i_first_extent = (isonum_733(de->extent) +
1373                         isonum_711(de->ext_attr_length));
1374 
1375         /* Set the number of blocks for stat() - should be done before RR */
1376         inode->i_blocks = (inode->i_size + 511) >> 9;
1377 
1378         /*
1379          * Now test for possible Rock Ridge extensions which will override
1380          * some of these numbers in the inode structure.
1381          */
1382 
1383         if (!high_sierra) {
1384                 parse_rock_ridge_inode(de, inode, relocated);
1385                 /* if we want uid/gid set, override the rock ridge setting */
1386                 if (sbi->s_uid_set)
1387                         inode->i_uid = sbi->s_uid;
1388                 if (sbi->s_gid_set)
1389                         inode->i_gid = sbi->s_gid;
1390         }
1391         /* Now set final access rights if overriding rock ridge setting */
1392         if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1393             sbi->s_dmode != ISOFS_INVALID_MODE)
1394                 inode->i_mode = S_IFDIR | sbi->s_dmode;
1395         if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1396             sbi->s_fmode != ISOFS_INVALID_MODE)
1397                 inode->i_mode = S_IFREG | sbi->s_fmode;
1398 
1399         /* Install the inode operations vector */
1400         if (S_ISREG(inode->i_mode)) {
1401                 inode->i_fop = &generic_ro_fops;
1402                 switch (ei->i_file_format) {
1403 #ifdef CONFIG_ZISOFS
1404                 case isofs_file_compressed:
1405                         inode->i_data.a_ops = &zisofs_aops;
1406                         break;
1407 #endif
1408                 default:
1409                         inode->i_data.a_ops = &isofs_aops;
1410                         break;
1411                 }
1412         } else if (S_ISDIR(inode->i_mode)) {
1413                 inode->i_op = &isofs_dir_inode_operations;
1414                 inode->i_fop = &isofs_dir_operations;
1415         } else if (S_ISLNK(inode->i_mode)) {
1416                 inode->i_op = &page_symlink_inode_operations;
1417                 inode_nohighmem(inode);
1418                 inode->i_data.a_ops = &isofs_symlink_aops;
1419         } else
1420                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1421                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1422 
1423         ret = 0;
1424 out:
1425         kfree(tmpde);
1426         if (bh)
1427                 brelse(bh);
1428         return ret;
1429 
1430 out_badread:
1431         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1432 fail:
1433         goto out;
1434 }
1435 
1436 struct isofs_iget5_callback_data {
1437         unsigned long block;
1438         unsigned long offset;
1439 };
1440 
1441 static int isofs_iget5_test(struct inode *ino, void *data)
1442 {
1443         struct iso_inode_info *i = ISOFS_I(ino);
1444         struct isofs_iget5_callback_data *d =
1445                 (struct isofs_iget5_callback_data*)data;
1446         return (i->i_iget5_block == d->block)
1447                 && (i->i_iget5_offset == d->offset);
1448 }
1449 
1450 static int isofs_iget5_set(struct inode *ino, void *data)
1451 {
1452         struct iso_inode_info *i = ISOFS_I(ino);
1453         struct isofs_iget5_callback_data *d =
1454                 (struct isofs_iget5_callback_data*)data;
1455         i->i_iget5_block = d->block;
1456         i->i_iget5_offset = d->offset;
1457         return 0;
1458 }
1459 
1460 /* Store, in the inode's containing structure, the block and block
1461  * offset that point to the underlying meta-data for the inode.  The
1462  * code below is otherwise similar to the iget() code in
1463  * include/linux/fs.h */
1464 struct inode *__isofs_iget(struct super_block *sb,
1465                            unsigned long block,
1466                            unsigned long offset,
1467                            int relocated)
1468 {
1469         unsigned long hashval;
1470         struct inode *inode;
1471         struct isofs_iget5_callback_data data;
1472         long ret;
1473 
1474         if (offset >= 1ul << sb->s_blocksize_bits)
1475                 return ERR_PTR(-EINVAL);
1476 
1477         data.block = block;
1478         data.offset = offset;
1479 
1480         hashval = (block << sb->s_blocksize_bits) | offset;
1481 
1482         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1483                                 &isofs_iget5_set, &data);
1484 
1485         if (!inode)
1486                 return ERR_PTR(-ENOMEM);
1487 
1488         if (inode->i_state & I_NEW) {
1489                 ret = isofs_read_inode(inode, relocated);
1490                 if (ret < 0) {
1491                         iget_failed(inode);
1492                         inode = ERR_PTR(ret);
1493                 } else {
1494                         unlock_new_inode(inode);
1495                 }
1496         }
1497 
1498         return inode;
1499 }
1500 
1501 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1502         int flags, const char *dev_name, void *data)
1503 {
1504         /* We don't support read-write mounts */
1505         if (!(flags & MS_RDONLY))
1506                 return ERR_PTR(-EACCES);
1507         return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1508 }
1509 
1510 static struct file_system_type iso9660_fs_type = {
1511         .owner          = THIS_MODULE,
1512         .name           = "iso9660",
1513         .mount          = isofs_mount,
1514         .kill_sb        = kill_block_super,
1515         .fs_flags       = FS_REQUIRES_DEV,
1516 };
1517 MODULE_ALIAS_FS("iso9660");
1518 MODULE_ALIAS("iso9660");
1519 
1520 static int __init init_iso9660_fs(void)
1521 {
1522         int err = init_inodecache();
1523         if (err)
1524                 goto out;
1525 #ifdef CONFIG_ZISOFS
1526         err = zisofs_init();
1527         if (err)
1528                 goto out1;
1529 #endif
1530         err = register_filesystem(&iso9660_fs_type);
1531         if (err)
1532                 goto out2;
1533         return 0;
1534 out2:
1535 #ifdef CONFIG_ZISOFS
1536         zisofs_cleanup();
1537 out1:
1538 #endif
1539         destroy_inodecache();
1540 out:
1541         return err;
1542 }
1543 
1544 static void __exit exit_iso9660_fs(void)
1545 {
1546         unregister_filesystem(&iso9660_fs_type);
1547 #ifdef CONFIG_ZISOFS
1548         zisofs_cleanup();
1549 #endif
1550         destroy_inodecache();
1551 }
1552 
1553 module_init(init_iso9660_fs)
1554 module_exit(exit_iso9660_fs)
1555 MODULE_LICENSE("GPL");
1556 

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