2 * linux/fs/isofs/inode.c
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
14 #include <linux/init.h>
15 #include <linux/module.h>
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>
29 static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
31 static int isofs_hash(const struct dentry *parent, const struct inode *inode,
33 static int isofs_dentry_cmpi(const struct dentry *parent,
34 const struct inode *pinode,
35 const struct dentry *dentry, const struct inode *inode,
36 unsigned int len, const char *str, const struct qstr *name);
37 static int isofs_dentry_cmp(const struct dentry *parent,
38 const struct inode *pinode,
39 const struct dentry *dentry, const struct inode *inode,
40 unsigned int len, const char *str, const struct qstr *name);
43 static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
45 static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
47 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
48 const struct inode *pinode,
49 const struct dentry *dentry, const struct inode *inode,
50 unsigned int len, const char *str, const struct qstr *name);
51 static int isofs_dentry_cmp_ms(const struct dentry *parent,
52 const struct inode *pinode,
53 const struct dentry *dentry, const struct inode *inode,
54 unsigned int len, const char *str, const struct qstr *name);
57 static void isofs_put_super(struct super_block *sb)
59 struct isofs_sb_info *sbi = ISOFS_SB(sb);
62 unload_nls(sbi->s_nls_iocharset);
70 static int isofs_read_inode(struct inode *);
71 static int isofs_statfs (struct dentry *, struct kstatfs *);
73 static struct kmem_cache *isofs_inode_cachep;
75 static struct inode *isofs_alloc_inode(struct super_block *sb)
77 struct iso_inode_info *ei;
78 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
81 return &ei->vfs_inode;
84 static void isofs_destroy_inode(struct inode *inode)
86 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
89 static void init_once(void *foo)
91 struct iso_inode_info *ei = foo;
93 inode_init_once(&ei->vfs_inode);
96 static int init_inodecache(void)
98 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
99 sizeof(struct iso_inode_info),
100 0, (SLAB_RECLAIM_ACCOUNT|
103 if (isofs_inode_cachep == NULL)
108 static void destroy_inodecache(void)
110 kmem_cache_destroy(isofs_inode_cachep);
113 static int isofs_remount(struct super_block *sb, int *flags, char *data)
115 /* we probably want a lot more here */
120 static const struct super_operations isofs_sops = {
121 .alloc_inode = isofs_alloc_inode,
122 .destroy_inode = isofs_destroy_inode,
123 .put_super = isofs_put_super,
124 .statfs = isofs_statfs,
125 .remount_fs = isofs_remount,
126 .show_options = generic_show_options,
130 static const struct dentry_operations isofs_dentry_ops[] = {
132 .d_hash = isofs_hash,
133 .d_compare = isofs_dentry_cmp,
136 .d_hash = isofs_hashi,
137 .d_compare = isofs_dentry_cmpi,
141 .d_hash = isofs_hash_ms,
142 .d_compare = isofs_dentry_cmp_ms,
145 .d_hash = isofs_hashi_ms,
146 .d_compare = isofs_dentry_cmpi_ms,
151 struct iso9660_options{
153 unsigned int joliet:1;
154 unsigned int cruft:1;
156 unsigned int showassoc:1;
157 unsigned int nocompress:1;
158 unsigned int overriderockperm:1;
159 unsigned int uid_set:1;
160 unsigned int gid_set:1;
164 unsigned int blocksize;
176 * Compute the hash for the isofs name corresponding to the dentry.
179 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
187 while (len && name[len-1] == '.')
191 qstr->hash = full_name_hash(name, len);
197 * Compute the hash for the isofs name corresponding to the dentry.
200 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
210 while (len && name[len-1] == '.')
214 hash = init_name_hash();
216 c = tolower(*name++);
217 hash = partial_name_hash(c, hash);
219 qstr->hash = end_name_hash(hash);
225 * Compare of two isofs names.
227 static int isofs_dentry_cmp_common(
228 unsigned int len, const char *str,
229 const struct qstr *name, int ms, int ci)
233 /* A filename cannot end in '.' or we treat it like it has none */
237 while (alen && name->name[alen-1] == '.')
239 while (blen && str[blen-1] == '.')
244 if (strnicmp(name->name, str, alen) == 0)
247 if (strncmp(name->name, str, alen) == 0)
255 isofs_hash(const struct dentry *dentry, const struct inode *inode,
258 return isofs_hash_common(dentry, qstr, 0);
262 isofs_hashi(const struct dentry *dentry, const struct inode *inode,
265 return isofs_hashi_common(dentry, qstr, 0);
269 isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
270 const struct dentry *dentry, const struct inode *inode,
271 unsigned int len, const char *str, const struct qstr *name)
273 return isofs_dentry_cmp_common(len, str, name, 0, 0);
277 isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
278 const struct dentry *dentry, const struct inode *inode,
279 unsigned int len, const char *str, const struct qstr *name)
281 return isofs_dentry_cmp_common(len, str, name, 0, 1);
286 isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
289 return isofs_hash_common(dentry, qstr, 1);
293 isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
296 return isofs_hashi_common(dentry, qstr, 1);
300 isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
301 const struct dentry *dentry, const struct inode *inode,
302 unsigned int len, const char *str, const struct qstr *name)
304 return isofs_dentry_cmp_common(len, str, name, 1, 0);
308 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
309 const struct dentry *dentry, const struct inode *inode,
310 unsigned int len, const char *str, const struct qstr *name)
312 return isofs_dentry_cmp_common(len, str, name, 1, 1);
317 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
318 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
319 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
320 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
323 static const match_table_t tokens = {
324 {Opt_norock, "norock"},
325 {Opt_nojoliet, "nojoliet"},
326 {Opt_unhide, "unhide"},
328 {Opt_showassoc, "showassoc"},
329 {Opt_cruft, "cruft"},
331 {Opt_iocharset, "iocharset=%s"},
332 {Opt_map_a, "map=acorn"},
333 {Opt_map_a, "map=a"},
334 {Opt_map_n, "map=normal"},
335 {Opt_map_n, "map=n"},
336 {Opt_map_o, "map=off"},
337 {Opt_map_o, "map=o"},
338 {Opt_session, "session=%u"},
339 {Opt_sb, "sbsector=%u"},
340 {Opt_check_r, "check=relaxed"},
341 {Opt_check_r, "check=r"},
342 {Opt_check_s, "check=strict"},
343 {Opt_check_s, "check=s"},
346 {Opt_mode, "mode=%u"},
347 {Opt_dmode, "dmode=%u"},
348 {Opt_overriderockperm, "overriderockperm"},
349 {Opt_block, "block=%u"},
350 {Opt_ignore, "conv=binary"},
351 {Opt_ignore, "conv=b"},
352 {Opt_ignore, "conv=text"},
353 {Opt_ignore, "conv=t"},
354 {Opt_ignore, "conv=mtext"},
355 {Opt_ignore, "conv=m"},
356 {Opt_ignore, "conv=auto"},
357 {Opt_ignore, "conv=a"},
358 {Opt_nocompress, "nocompress"},
362 static int parse_options(char *options, struct iso9660_options *popt)
373 popt->check = 'u'; /* unset */
374 popt->nocompress = 0;
375 popt->blocksize = 1024;
376 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
381 popt->iocharset = NULL;
383 popt->overriderockperm = 0;
389 while ((p = strsep(&options, ",")) != NULL) {
391 substring_t args[MAX_OPT_ARGS];
397 token = match_token(p, tokens, args);
420 popt->iocharset = match_strdup(&args[0]);
433 if (match_int(&args[0], &option))
438 popt->session = n + 1;
441 if (match_int(&args[0], &option))
443 popt->sbsector = option;
454 if (match_int(&args[0], &option))
460 if (match_int(&args[0], &option))
466 if (match_int(&args[0], &option))
468 popt->fmode = option;
471 if (match_int(&args[0], &option))
473 popt->dmode = option;
475 case Opt_overriderockperm:
476 popt->overriderockperm = 1;
479 if (match_int(&args[0], &option))
482 if (n != 512 && n != 1024 && n != 2048)
487 popt->nocompress = 1;
497 * look if the driver can tell the multi session redirection value
499 * don't change this if you don't know what you do, please!
500 * Multisession is legal only with XA disks.
501 * A non-XA disk with more than one volume descriptor may do it right, but
502 * usually is written in a nowhere standardized "multi-partition" manner.
503 * Multisession uses absolute addressing (solely the first frame of the whole
504 * track is #0), multi-partition uses relative addressing (each first frame of
505 * each track is #0), and a track is not a session.
507 * A broken CDwriter software or drive firmware does not set new standards,
508 * at least not if conflicting with the existing ones.
512 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
514 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
516 struct cdrom_multisession ms_info;
517 unsigned int vol_desc_start;
518 struct block_device *bdev = sb->s_bdev;
522 ms_info.addr_format=CDROM_LBA;
523 if(session >= 0 && session <= 99) {
524 struct cdrom_tocentry Te;
525 Te.cdte_track=session;
526 Te.cdte_format=CDROM_LBA;
527 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
529 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
530 session, Te.cdte_addr.lba,
531 Te.cdte_ctrl&CDROM_DATA_TRACK);
532 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
533 return Te.cdte_addr.lba;
536 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
538 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
540 printk(KERN_ERR "ISOFS: Invalid session number\n");
542 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
544 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
545 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
549 #if WE_OBEY_THE_WRITTEN_STANDARDS
550 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
552 vol_desc_start=ms_info.addr.lba;
553 return vol_desc_start;
557 * Check if root directory is empty (has less than 3 files).
559 * Used to detect broken CDs where ISO root directory is empty but Joliet root
560 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
561 * (and Joliet used instead) or else no files would be visible.
563 static bool rootdir_empty(struct super_block *sb, unsigned long block)
565 int offset = 0, files = 0, de_len;
566 struct iso_directory_record *de;
567 struct buffer_head *bh;
569 bh = sb_bread(sb, block);
573 de = (struct iso_directory_record *) (bh->b_data + offset);
574 de_len = *(unsigned char *) de;
585 * Initialize the superblock and read the root inode.
587 * Note: a check_disk_change() has been done immediately prior
588 * to this call, so we don't need to check again.
590 static int isofs_fill_super(struct super_block *s, void *data, int silent)
592 struct buffer_head *bh = NULL, *pri_bh = NULL;
593 struct hs_primary_descriptor *h_pri = NULL;
594 struct iso_primary_descriptor *pri = NULL;
595 struct iso_supplementary_descriptor *sec = NULL;
596 struct iso_directory_record *rootp;
598 struct iso9660_options opt;
599 struct isofs_sb_info *sbi;
600 unsigned long first_data_zone;
601 int joliet_level = 0;
602 int iso_blknum, block;
604 int table, error = -EINVAL;
605 unsigned int vol_desc_start;
607 save_mount_options(s, data);
609 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
614 if (!parse_options((char *)data, &opt))
618 * First of all, get the hardware blocksize for this device.
619 * If we don't know what it is, or the hardware blocksize is
620 * larger than the blocksize the user specified, then use
624 * What if bugger tells us to go beyond page size?
626 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
628 sbi->s_high_sierra = 0; /* default is iso9660 */
630 vol_desc_start = (opt.sbsector != -1) ?
631 opt.sbsector : isofs_get_last_session(s,opt.session);
633 for (iso_blknum = vol_desc_start+16;
634 iso_blknum < vol_desc_start+100; iso_blknum++) {
635 struct hs_volume_descriptor *hdp;
636 struct iso_volume_descriptor *vdp;
638 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
639 if (!(bh = sb_bread(s, block)))
642 vdp = (struct iso_volume_descriptor *)bh->b_data;
643 hdp = (struct hs_volume_descriptor *)bh->b_data;
646 * Due to the overlapping physical location of the descriptors,
647 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
648 * proper identification in this case, we first check for ISO.
650 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
651 if (isonum_711(vdp->type) == ISO_VD_END)
653 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
655 pri = (struct iso_primary_descriptor *)vdp;
656 /* Save the buffer in case we need it ... */
662 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
663 sec = (struct iso_supplementary_descriptor *)vdp;
664 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
666 if (sec->escape[2] == 0x40)
668 else if (sec->escape[2] == 0x43)
670 else if (sec->escape[2] == 0x45)
673 printk(KERN_DEBUG "ISO 9660 Extensions: "
674 "Microsoft Joliet Level %d\n",
679 /* Unknown supplementary volume descriptor */
685 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
686 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
689 sbi->s_high_sierra = 1;
691 h_pri = (struct hs_primary_descriptor *)vdp;
696 /* Just skip any volume descriptors we don't recognize */
702 * If we fall through, either no volume descriptor was found,
703 * or else we passed a primary descriptor looking for others.
706 goto out_unknown_format;
713 if (joliet_level && (pri == NULL || !opt.rock)) {
714 /* This is the case of Joliet with the norock mount flag.
715 * A disc with both Joliet and Rock Ridge is handled later
717 pri = (struct iso_primary_descriptor *) sec;
720 if(sbi->s_high_sierra){
721 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
722 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
723 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
724 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
728 rootp = (struct iso_directory_record *) pri->root_directory_record;
729 sbi->s_nzones = isonum_733(pri->volume_space_size);
730 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
731 sbi->s_max_size = isonum_733(pri->volume_space_size);
734 sbi->s_ninodes = 0; /* No way to figure this out easily */
736 orig_zonesize = sbi->s_log_zone_size;
738 * If the zone size is smaller than the hardware sector size,
739 * this is a fatal error. This would occur if the disc drive
740 * had sectors that were 2048 bytes, but the filesystem had
741 * blocks that were 512 bytes (which should only very rarely
744 if (orig_zonesize < opt.blocksize)
747 /* RDE: convert log zone size to bit shift */
748 switch (sbi->s_log_zone_size) {
749 case 512: sbi->s_log_zone_size = 9; break;
750 case 1024: sbi->s_log_zone_size = 10; break;
751 case 2048: sbi->s_log_zone_size = 11; break;
754 goto out_bad_zone_size;
757 s->s_magic = ISOFS_SUPER_MAGIC;
760 * With multi-extent files, file size is only limited by the maximum
761 * size of a file system, which is 8 TB.
763 s->s_maxbytes = 0x80000000000LL;
766 * The CDROM is read-only, has no nodes (devices) on it, and since
767 * all of the files appear to be owned by root, we really do not want
768 * to allow suid. (suid or devices will not show up unless we have
769 * Rock Ridge extensions)
772 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
774 /* Set this for reference. Its not currently used except on write
775 which we don't have .. */
777 first_data_zone = isonum_733(rootp->extent) +
778 isonum_711(rootp->ext_attr_length);
779 sbi->s_firstdatazone = first_data_zone;
781 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
782 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
783 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
784 if(sbi->s_high_sierra)
785 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
789 * If the Joliet level is set, we _may_ decide to use the
790 * secondary descriptor, but can't be sure until after we
791 * read the root inode. But before reading the root inode
792 * we may need to change the device blocksize, and would
793 * rather release the old buffer first. So, we cache the
794 * first_data_zone value from the secondary descriptor.
797 pri = (struct iso_primary_descriptor *) sec;
798 rootp = (struct iso_directory_record *)
799 pri->root_directory_record;
800 first_data_zone = isonum_733(rootp->extent) +
801 isonum_711(rootp->ext_attr_length);
805 * We're all done using the volume descriptor, and may need
806 * to change the device blocksize, so release the buffer now.
812 * Force the blocksize to 512 for 512 byte sectors. The file
813 * read primitives really get it wrong in a bad way if we don't
816 * Note - we should never be setting the blocksize to something
817 * less than the hardware sector size for the device. If we
818 * do, we would end up having to read larger buffers and split
819 * out portions to satisfy requests.
821 * Note2- the idea here is that we want to deal with the optimal
822 * zonesize in the filesystem. If we have it set to something less,
823 * then we have horrible problems with trying to piece together
824 * bits of adjacent blocks in order to properly read directory
825 * entries. By forcing the blocksize in this way, we ensure
826 * that we will never be required to do this.
828 sb_set_blocksize(s, orig_zonesize);
830 sbi->s_nls_iocharset = NULL;
833 if (joliet_level && opt.utf8 == 0) {
834 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
835 sbi->s_nls_iocharset = load_nls(p);
836 if (! sbi->s_nls_iocharset) {
837 /* Fail only if explicit charset specified */
840 sbi->s_nls_iocharset = load_nls_default();
844 s->s_op = &isofs_sops;
845 s->s_export_op = &isofs_export_ops;
846 sbi->s_mapping = opt.map;
847 sbi->s_rock = (opt.rock ? 2 : 0);
848 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
849 sbi->s_cruft = opt.cruft;
850 sbi->s_hide = opt.hide;
851 sbi->s_showassoc = opt.showassoc;
852 sbi->s_uid = opt.uid;
853 sbi->s_gid = opt.gid;
854 sbi->s_uid_set = opt.uid_set;
855 sbi->s_gid_set = opt.gid_set;
856 sbi->s_utf8 = opt.utf8;
857 sbi->s_nocompress = opt.nocompress;
858 sbi->s_overriderockperm = opt.overriderockperm;
859 mutex_init(&sbi->s_mutex);
861 * It would be incredibly stupid to allow people to mark every file
862 * on the disk as suid, so we merely allow them to set the default
865 if (opt.fmode != ISOFS_INVALID_MODE)
866 sbi->s_fmode = opt.fmode & 0777;
868 sbi->s_fmode = ISOFS_INVALID_MODE;
869 if (opt.dmode != ISOFS_INVALID_MODE)
870 sbi->s_dmode = opt.dmode & 0777;
872 sbi->s_dmode = ISOFS_INVALID_MODE;
875 * Read the root inode, which _may_ result in changing
876 * the s_rock flag. Once we have the final s_rock value,
877 * we then decide whether to use the Joliet descriptor.
879 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
884 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
885 * correct Joliet root directory.
887 if (sbi->s_rock == 1 && joliet_level &&
888 rootdir_empty(s, sbi->s_firstdatazone)) {
890 "ISOFS: primary root directory is empty. "
891 "Disabling Rock Ridge and switching to Joliet.");
896 * If this disk has both Rock Ridge and Joliet on it, then we
897 * want to use Rock Ridge by default. This can be overridden
898 * by using the norock mount option. There is still one other
899 * possibility that is not taken into account: a Rock Ridge
900 * CD with Unicode names. Until someone sees such a beast, it
901 * will not be supported.
903 if (sbi->s_rock == 1) {
905 } else if (joliet_level) {
907 if (sbi->s_firstdatazone != first_data_zone) {
908 sbi->s_firstdatazone = first_data_zone;
910 "ISOFS: changing to secondary root\n");
912 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
918 if (opt.check == 'u') {
919 /* Only Joliet is case insensitive by default */
925 sbi->s_joliet_level = joliet_level;
927 /* Make sure the root inode is a directory */
928 if (!S_ISDIR(inode->i_mode)) {
930 "isofs_fill_super: root inode is not a directory. "
931 "Corrupted media?\n");
935 /* get the root dentry */
936 s->s_root = d_alloc_root(inode);
943 if (opt.check == 'r')
945 s->s_root->d_op = &isofs_dentry_ops[table];
947 kfree(opt.iocharset);
952 * Display error messages and free resources.
958 error = PTR_ERR(inode);
959 if (error != -ENOMEM)
960 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
963 unload_nls(sbi->s_nls_iocharset);
967 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
968 __func__, s->s_id, iso_blknum, block);
971 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
972 sbi->s_log_zone_size);
975 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
976 orig_zonesize, opt.blocksize);
980 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
985 kfree(opt.iocharset);
991 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
993 struct super_block *sb = dentry->d_sb;
994 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
996 buf->f_type = ISOFS_SUPER_MAGIC;
997 buf->f_bsize = sb->s_blocksize;
998 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
999 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1002 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1004 buf->f_fsid.val[0] = (u32)id;
1005 buf->f_fsid.val[1] = (u32)(id >> 32);
1006 buf->f_namelen = NAME_MAX;
1011 * Get a set of blocks; filling in buffer_heads if already allocated
1012 * or getblk() if they are not. Returns the number of blocks inserted
1015 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1016 struct buffer_head **bh, unsigned long nblocks)
1018 unsigned long b_off = iblock;
1019 unsigned offset, sect_size;
1020 unsigned int firstext;
1021 unsigned long nextblk, nextoff;
1022 int section, rv, error;
1023 struct iso_inode_info *ei = ISOFS_I(inode);
1027 if (iblock != b_off) {
1028 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1034 firstext = ei->i_first_extent;
1035 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1036 nextblk = ei->i_next_section_block;
1037 nextoff = ei->i_next_section_offset;
1041 /* If we are *way* beyond the end of the file, print a message.
1042 * Access beyond the end of the file up to the next page boundary
1043 * is normal, however because of the way the page cache works.
1044 * In this case, we just return 0 so that we can properly fill
1045 * the page with useless information without generating any
1048 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1049 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1051 (unsigned long long)inode->i_size);
1055 /* On the last section, nextblk == 0, section size is likely to
1056 * exceed sect_size by a partial block, and access beyond the
1057 * end of the file will reach beyond the section size, too.
1059 while (nextblk && (b_off >= (offset + sect_size))) {
1060 struct inode *ninode;
1062 offset += sect_size;
1063 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1064 if (IS_ERR(ninode)) {
1065 error = PTR_ERR(ninode);
1068 firstext = ISOFS_I(ninode)->i_first_extent;
1069 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1070 nextblk = ISOFS_I(ninode)->i_next_section_block;
1071 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1074 if (++section > 100) {
1075 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1076 " aborting...\n", __func__);
1077 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1078 "nextblk=%lu nextoff=%lu\n", __func__,
1079 b_off, firstext, (unsigned) sect_size,
1086 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1088 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1092 bh++; /* Next buffer head */
1093 b_off++; /* Next buffer offset */
1100 return rv != 0 ? rv : error;
1104 * Used by the standard interfaces.
1106 static int isofs_get_block(struct inode *inode, sector_t iblock,
1107 struct buffer_head *bh_result, int create)
1112 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1116 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1117 return ret < 0 ? ret : 0;
1120 static int isofs_bmap(struct inode *inode, sector_t block)
1122 struct buffer_head dummy;
1126 dummy.b_blocknr = -1000;
1127 error = isofs_get_block(inode, block, &dummy, 0);
1129 return dummy.b_blocknr;
1133 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1135 sector_t blknr = isofs_bmap(inode, block);
1138 return sb_bread(inode->i_sb, blknr);
1141 static int isofs_readpage(struct file *file, struct page *page)
1143 return block_read_full_page(page,isofs_get_block);
1146 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1148 return generic_block_bmap(mapping,block,isofs_get_block);
1151 static const struct address_space_operations isofs_aops = {
1152 .readpage = isofs_readpage,
1153 .sync_page = block_sync_page,
1157 static int isofs_read_level3_size(struct inode *inode)
1159 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1160 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1161 struct buffer_head *bh = NULL;
1162 unsigned long block, offset, block_saved, offset_saved;
1164 int more_entries = 0;
1165 struct iso_directory_record *tmpde = NULL;
1166 struct iso_inode_info *ei = ISOFS_I(inode);
1170 /* The first 16 blocks are reserved as the System Area. Thus,
1171 * no inodes can appear in block 0. We use this to flag that
1172 * this is the last section. */
1173 ei->i_next_section_block = 0;
1174 ei->i_next_section_offset = 0;
1176 block = ei->i_iget5_block;
1177 offset = ei->i_iget5_offset;
1180 struct iso_directory_record *de;
1181 unsigned int de_len;
1184 bh = sb_bread(inode->i_sb, block);
1188 de = (struct iso_directory_record *) (bh->b_data + offset);
1189 de_len = *(unsigned char *) de;
1199 block_saved = block;
1200 offset_saved = offset;
1203 /* Make sure we have a full directory entry */
1204 if (offset >= bufsize) {
1205 int slop = bufsize - offset + de_len;
1207 tmpde = kmalloc(256, GFP_KERNEL);
1211 memcpy(tmpde, de, slop);
1212 offset &= bufsize - 1;
1217 bh = sb_bread(inode->i_sb, block);
1220 memcpy((void *)tmpde+slop, bh->b_data, offset);
1225 inode->i_size += isonum_733(de->size);
1227 ei->i_next_section_block = block_saved;
1228 ei->i_next_section_offset = offset_saved;
1231 more_entries = de->flags[-high_sierra] & 0x80;
1236 } while (more_entries);
1249 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1254 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1255 "isofs_read_level3_size: inode=%lu\n",
1256 __func__, inode->i_ino);
1260 static int isofs_read_inode(struct inode *inode)
1262 struct super_block *sb = inode->i_sb;
1263 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1264 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1265 unsigned long block;
1266 int high_sierra = sbi->s_high_sierra;
1267 struct buffer_head *bh = NULL;
1268 struct iso_directory_record *de;
1269 struct iso_directory_record *tmpde = NULL;
1270 unsigned int de_len;
1271 unsigned long offset;
1272 struct iso_inode_info *ei = ISOFS_I(inode);
1275 block = ei->i_iget5_block;
1276 bh = sb_bread(inode->i_sb, block);
1280 offset = ei->i_iget5_offset;
1282 de = (struct iso_directory_record *) (bh->b_data + offset);
1283 de_len = *(unsigned char *) de;
1285 if (offset + de_len > bufsize) {
1286 int frag1 = bufsize - offset;
1288 tmpde = kmalloc(de_len, GFP_KERNEL);
1289 if (tmpde == NULL) {
1290 printk(KERN_INFO "%s: out of memory\n", __func__);
1294 memcpy(tmpde, bh->b_data + offset, frag1);
1296 bh = sb_bread(inode->i_sb, ++block);
1299 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1303 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1305 ISOFS_BUFFER_BITS(inode));
1307 /* Assume it is a normal-format file unless told otherwise */
1308 ei->i_file_format = isofs_file_normal;
1310 if (de->flags[-high_sierra] & 2) {
1311 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1312 inode->i_mode = S_IFDIR | sbi->s_dmode;
1314 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1315 inode->i_nlink = 1; /*
1316 * Set to 1. We know there are 2, but
1317 * the find utility tries to optimize
1318 * if it is 2, and it screws up. It is
1319 * easier to give 1 which tells find to
1320 * do it the hard way.
1323 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1324 inode->i_mode = S_IFREG | sbi->s_fmode;
1327 * Set default permissions: r-x for all. The disc
1328 * could be shared with DOS machines so virtually
1329 * anything could be a valid executable.
1331 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1335 inode->i_uid = sbi->s_uid;
1336 inode->i_gid = sbi->s_gid;
1337 inode->i_blocks = 0;
1339 ei->i_format_parm[0] = 0;
1340 ei->i_format_parm[1] = 0;
1341 ei->i_format_parm[2] = 0;
1343 ei->i_section_size = isonum_733(de->size);
1344 if (de->flags[-high_sierra] & 0x80) {
1345 ret = isofs_read_level3_size(inode);
1350 ei->i_next_section_block = 0;
1351 ei->i_next_section_offset = 0;
1352 inode->i_size = isonum_733(de->size);
1356 * Some dipshit decided to store some other bit of information
1357 * in the high byte of the file length. Truncate size in case
1358 * this CDROM was mounted with the cruft option.
1362 inode->i_size &= 0x00ffffff;
1364 if (de->interleave[0]) {
1365 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1369 /* I have no idea what file_unit_size is used for, so
1370 we will flag it for now */
1371 if (de->file_unit_size[0] != 0) {
1372 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1376 /* I have no idea what other flag bits are used for, so
1377 we will flag it for now */
1379 if((de->flags[-high_sierra] & ~2)!= 0){
1380 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1382 inode->i_ino, de->flags[-high_sierra]);
1386 inode->i_mtime.tv_sec =
1387 inode->i_atime.tv_sec =
1388 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1389 inode->i_mtime.tv_nsec =
1390 inode->i_atime.tv_nsec =
1391 inode->i_ctime.tv_nsec = 0;
1393 ei->i_first_extent = (isonum_733(de->extent) +
1394 isonum_711(de->ext_attr_length));
1396 /* Set the number of blocks for stat() - should be done before RR */
1397 inode->i_blocks = (inode->i_size + 511) >> 9;
1400 * Now test for possible Rock Ridge extensions which will override
1401 * some of these numbers in the inode structure.
1405 parse_rock_ridge_inode(de, inode);
1406 /* if we want uid/gid set, override the rock ridge setting */
1408 inode->i_uid = sbi->s_uid;
1410 inode->i_gid = sbi->s_gid;
1412 /* Now set final access rights if overriding rock ridge setting */
1413 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1414 sbi->s_dmode != ISOFS_INVALID_MODE)
1415 inode->i_mode = S_IFDIR | sbi->s_dmode;
1416 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1417 sbi->s_fmode != ISOFS_INVALID_MODE)
1418 inode->i_mode = S_IFREG | sbi->s_fmode;
1420 /* Install the inode operations vector */
1421 if (S_ISREG(inode->i_mode)) {
1422 inode->i_fop = &generic_ro_fops;
1423 switch (ei->i_file_format) {
1424 #ifdef CONFIG_ZISOFS
1425 case isofs_file_compressed:
1426 inode->i_data.a_ops = &zisofs_aops;
1430 inode->i_data.a_ops = &isofs_aops;
1433 } else if (S_ISDIR(inode->i_mode)) {
1434 inode->i_op = &isofs_dir_inode_operations;
1435 inode->i_fop = &isofs_dir_operations;
1436 } else if (S_ISLNK(inode->i_mode)) {
1437 inode->i_op = &page_symlink_inode_operations;
1438 inode->i_data.a_ops = &isofs_symlink_aops;
1440 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1441 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1451 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1456 struct isofs_iget5_callback_data {
1457 unsigned long block;
1458 unsigned long offset;
1461 static int isofs_iget5_test(struct inode *ino, void *data)
1463 struct iso_inode_info *i = ISOFS_I(ino);
1464 struct isofs_iget5_callback_data *d =
1465 (struct isofs_iget5_callback_data*)data;
1466 return (i->i_iget5_block == d->block)
1467 && (i->i_iget5_offset == d->offset);
1470 static int isofs_iget5_set(struct inode *ino, void *data)
1472 struct iso_inode_info *i = ISOFS_I(ino);
1473 struct isofs_iget5_callback_data *d =
1474 (struct isofs_iget5_callback_data*)data;
1475 i->i_iget5_block = d->block;
1476 i->i_iget5_offset = d->offset;
1480 /* Store, in the inode's containing structure, the block and block
1481 * offset that point to the underlying meta-data for the inode. The
1482 * code below is otherwise similar to the iget() code in
1483 * include/linux/fs.h */
1484 struct inode *isofs_iget(struct super_block *sb,
1485 unsigned long block,
1486 unsigned long offset)
1488 unsigned long hashval;
1489 struct inode *inode;
1490 struct isofs_iget5_callback_data data;
1493 if (offset >= 1ul << sb->s_blocksize_bits)
1494 return ERR_PTR(-EINVAL);
1497 data.offset = offset;
1499 hashval = (block << sb->s_blocksize_bits) | offset;
1501 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1502 &isofs_iget5_set, &data);
1505 return ERR_PTR(-ENOMEM);
1507 if (inode->i_state & I_NEW) {
1508 ret = isofs_read_inode(inode);
1511 inode = ERR_PTR(ret);
1513 unlock_new_inode(inode);
1520 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1521 int flags, const char *dev_name, void *data)
1523 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1526 static struct file_system_type iso9660_fs_type = {
1527 .owner = THIS_MODULE,
1529 .mount = isofs_mount,
1530 .kill_sb = kill_block_super,
1531 .fs_flags = FS_REQUIRES_DEV,
1534 static int __init init_iso9660_fs(void)
1536 int err = init_inodecache();
1539 #ifdef CONFIG_ZISOFS
1540 err = zisofs_init();
1544 err = register_filesystem(&iso9660_fs_type);
1549 #ifdef CONFIG_ZISOFS
1553 destroy_inodecache();
1558 static void __exit exit_iso9660_fs(void)
1560 unregister_filesystem(&iso9660_fs_type);
1561 #ifdef CONFIG_ZISOFS
1564 destroy_inodecache();
1567 module_init(init_iso9660_fs)
1568 module_exit(exit_iso9660_fs)
1569 MODULE_LICENSE("GPL");
1570 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1571 MODULE_ALIAS("iso9660");