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

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