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/smp_lock.h>
21 #include <linux/statfs.h>
22 #include <linux/cdrom.h>
23 #include <linux/parser.h>
30 static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
31 static int isofs_hash(struct dentry *parent, struct qstr *qstr);
32 static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
33 static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
36 static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
37 static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
38 static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
39 static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
42 static void isofs_put_super(struct super_block *sb)
44 struct isofs_sb_info *sbi = ISOFS_SB(sb);
49 if (sbi->s_nls_iocharset) {
50 unload_nls(sbi->s_nls_iocharset);
51 sbi->s_nls_iocharset = NULL;
62 static int isofs_read_inode(struct inode *);
63 static int isofs_statfs (struct dentry *, struct kstatfs *);
65 static struct kmem_cache *isofs_inode_cachep;
67 static struct inode *isofs_alloc_inode(struct super_block *sb)
69 struct iso_inode_info *ei;
70 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
73 return &ei->vfs_inode;
76 static void isofs_destroy_inode(struct inode *inode)
78 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
81 static void init_once(void *foo)
83 struct iso_inode_info *ei = foo;
85 inode_init_once(&ei->vfs_inode);
88 static int init_inodecache(void)
90 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
91 sizeof(struct iso_inode_info),
92 0, (SLAB_RECLAIM_ACCOUNT|
95 if (isofs_inode_cachep == NULL)
100 static void destroy_inodecache(void)
102 kmem_cache_destroy(isofs_inode_cachep);
105 static int isofs_remount(struct super_block *sb, int *flags, char *data)
107 /* we probably want a lot more here */
112 static const struct super_operations isofs_sops = {
113 .alloc_inode = isofs_alloc_inode,
114 .destroy_inode = isofs_destroy_inode,
115 .put_super = isofs_put_super,
116 .statfs = isofs_statfs,
117 .remount_fs = isofs_remount,
118 .show_options = generic_show_options,
122 static const struct dentry_operations isofs_dentry_ops[] = {
124 .d_hash = isofs_hash,
125 .d_compare = isofs_dentry_cmp,
128 .d_hash = isofs_hashi,
129 .d_compare = isofs_dentry_cmpi,
133 .d_hash = isofs_hash_ms,
134 .d_compare = isofs_dentry_cmp_ms,
137 .d_hash = isofs_hashi_ms,
138 .d_compare = isofs_dentry_cmpi_ms,
143 struct iso9660_options{
151 char overriderockperm;
153 unsigned int blocksize;
166 * Compute the hash for the isofs name corresponding to the dentry.
169 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
177 while (len && name[len-1] == '.')
181 qstr->hash = full_name_hash(name, len);
187 * Compute the hash for the isofs name corresponding to the dentry.
190 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
200 while (len && name[len-1] == '.')
204 hash = init_name_hash();
206 c = tolower(*name++);
207 hash = partial_name_hash(c, hash);
209 qstr->hash = end_name_hash(hash);
215 * Case insensitive compare of two isofs names.
217 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
218 struct qstr *b, int ms)
222 /* A filename cannot end in '.' or we treat it like it has none */
226 while (alen && a->name[alen-1] == '.')
228 while (blen && b->name[blen-1] == '.')
232 if (strnicmp(a->name, b->name, alen) == 0)
239 * Case sensitive compare of two isofs names.
241 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
242 struct qstr *b, int ms)
246 /* A filename cannot end in '.' or we treat it like it has none */
250 while (alen && a->name[alen-1] == '.')
252 while (blen && b->name[blen-1] == '.')
256 if (strncmp(a->name, b->name, alen) == 0)
263 isofs_hash(struct dentry *dentry, struct qstr *qstr)
265 return isofs_hash_common(dentry, qstr, 0);
269 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
271 return isofs_hashi_common(dentry, qstr, 0);
275 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
277 return isofs_dentry_cmp_common(dentry, a, b, 0);
281 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
283 return isofs_dentry_cmpi_common(dentry, a, b, 0);
288 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
290 return isofs_hash_common(dentry, qstr, 1);
294 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
296 return isofs_hashi_common(dentry, qstr, 1);
300 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
302 return isofs_dentry_cmp_common(dentry, a, b, 1);
306 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
308 return isofs_dentry_cmpi_common(dentry, a, b, 1);
313 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
314 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
315 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
316 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
319 static const match_table_t tokens = {
320 {Opt_norock, "norock"},
321 {Opt_nojoliet, "nojoliet"},
322 {Opt_unhide, "unhide"},
324 {Opt_showassoc, "showassoc"},
325 {Opt_cruft, "cruft"},
327 {Opt_iocharset, "iocharset=%s"},
328 {Opt_map_a, "map=acorn"},
329 {Opt_map_a, "map=a"},
330 {Opt_map_n, "map=normal"},
331 {Opt_map_n, "map=n"},
332 {Opt_map_o, "map=off"},
333 {Opt_map_o, "map=o"},
334 {Opt_session, "session=%u"},
335 {Opt_sb, "sbsector=%u"},
336 {Opt_check_r, "check=relaxed"},
337 {Opt_check_r, "check=r"},
338 {Opt_check_s, "check=strict"},
339 {Opt_check_s, "check=s"},
342 {Opt_mode, "mode=%u"},
343 {Opt_dmode, "dmode=%u"},
344 {Opt_overriderockperm, "overriderockperm"},
345 {Opt_block, "block=%u"},
346 {Opt_ignore, "conv=binary"},
347 {Opt_ignore, "conv=b"},
348 {Opt_ignore, "conv=text"},
349 {Opt_ignore, "conv=t"},
350 {Opt_ignore, "conv=mtext"},
351 {Opt_ignore, "conv=m"},
352 {Opt_ignore, "conv=auto"},
353 {Opt_ignore, "conv=a"},
354 {Opt_nocompress, "nocompress"},
358 static int parse_options(char *options, struct iso9660_options *popt)
368 popt->showassoc = 'n';
369 popt->check = 'u'; /* unset */
370 popt->nocompress = 0;
371 popt->blocksize = 1024;
372 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
375 popt->iocharset = NULL;
377 popt->overriderockperm = 0;
383 while ((p = strsep(&options, ",")) != NULL) {
385 substring_t args[MAX_OPT_ARGS];
391 token = match_token(p, tokens, args);
404 popt->showassoc = 'y';
414 popt->iocharset = match_strdup(&args[0]);
427 if (match_int(&args[0], &option))
432 popt->session = n + 1;
435 if (match_int(&args[0], &option))
437 popt->sbsector = option;
448 if (match_int(&args[0], &option))
453 if (match_int(&args[0], &option))
458 if (match_int(&args[0], &option))
460 popt->fmode = option;
463 if (match_int(&args[0], &option))
465 popt->dmode = option;
467 case Opt_overriderockperm:
468 popt->overriderockperm = 1;
471 if (match_int(&args[0], &option))
474 if (n != 512 && n != 1024 && n != 2048)
479 popt->nocompress = 1;
489 * look if the driver can tell the multi session redirection value
491 * don't change this if you don't know what you do, please!
492 * Multisession is legal only with XA disks.
493 * A non-XA disk with more than one volume descriptor may do it right, but
494 * usually is written in a nowhere standardized "multi-partition" manner.
495 * Multisession uses absolute addressing (solely the first frame of the whole
496 * track is #0), multi-partition uses relative addressing (each first frame of
497 * each track is #0), and a track is not a session.
499 * A broken CDwriter software or drive firmware does not set new standards,
500 * at least not if conflicting with the existing ones.
504 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
506 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
508 struct cdrom_multisession ms_info;
509 unsigned int vol_desc_start;
510 struct block_device *bdev = sb->s_bdev;
514 ms_info.addr_format=CDROM_LBA;
515 if(session >= 0 && session <= 99) {
516 struct cdrom_tocentry Te;
517 Te.cdte_track=session;
518 Te.cdte_format=CDROM_LBA;
519 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
521 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
522 session, Te.cdte_addr.lba,
523 Te.cdte_ctrl&CDROM_DATA_TRACK);
524 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
525 return Te.cdte_addr.lba;
528 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
530 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
532 printk(KERN_ERR "ISOFS: Invalid session number\n");
534 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
536 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
537 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
541 #if WE_OBEY_THE_WRITTEN_STANDARDS
542 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
544 vol_desc_start=ms_info.addr.lba;
545 return vol_desc_start;
549 * Initialize the superblock and read the root inode.
551 * Note: a check_disk_change() has been done immediately prior
552 * to this call, so we don't need to check again.
554 static int isofs_fill_super(struct super_block *s, void *data, int silent)
556 struct buffer_head *bh = NULL, *pri_bh = NULL;
557 struct hs_primary_descriptor *h_pri = NULL;
558 struct iso_primary_descriptor *pri = NULL;
559 struct iso_supplementary_descriptor *sec = NULL;
560 struct iso_directory_record *rootp;
562 struct iso9660_options opt;
563 struct isofs_sb_info *sbi;
564 unsigned long first_data_zone;
565 int joliet_level = 0;
566 int iso_blknum, block;
568 int table, error = -EINVAL;
569 unsigned int vol_desc_start;
571 save_mount_options(s, data);
573 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
578 if (!parse_options((char *)data, &opt))
582 * First of all, get the hardware blocksize for this device.
583 * If we don't know what it is, or the hardware blocksize is
584 * larger than the blocksize the user specified, then use
588 * What if bugger tells us to go beyond page size?
590 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
592 sbi->s_high_sierra = 0; /* default is iso9660 */
594 vol_desc_start = (opt.sbsector != -1) ?
595 opt.sbsector : isofs_get_last_session(s,opt.session);
597 for (iso_blknum = vol_desc_start+16;
598 iso_blknum < vol_desc_start+100; iso_blknum++) {
599 struct hs_volume_descriptor *hdp;
600 struct iso_volume_descriptor *vdp;
602 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
603 if (!(bh = sb_bread(s, block)))
606 vdp = (struct iso_volume_descriptor *)bh->b_data;
607 hdp = (struct hs_volume_descriptor *)bh->b_data;
610 * Due to the overlapping physical location of the descriptors,
611 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
612 * proper identification in this case, we first check for ISO.
614 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
615 if (isonum_711(vdp->type) == ISO_VD_END)
617 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
619 pri = (struct iso_primary_descriptor *)vdp;
620 /* Save the buffer in case we need it ... */
626 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
627 sec = (struct iso_supplementary_descriptor *)vdp;
628 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
629 if (opt.joliet == 'y') {
630 if (sec->escape[2] == 0x40)
632 else if (sec->escape[2] == 0x43)
634 else if (sec->escape[2] == 0x45)
637 printk(KERN_DEBUG "ISO 9660 Extensions: "
638 "Microsoft Joliet Level %d\n",
643 /* Unknown supplementary volume descriptor */
649 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
650 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
653 sbi->s_high_sierra = 1;
655 h_pri = (struct hs_primary_descriptor *)vdp;
660 /* Just skip any volume descriptors we don't recognize */
666 * If we fall through, either no volume descriptor was found,
667 * or else we passed a primary descriptor looking for others.
670 goto out_unknown_format;
677 if (joliet_level && (pri == NULL || opt.rock == 'n')) {
678 /* This is the case of Joliet with the norock mount flag.
679 * A disc with both Joliet and Rock Ridge is handled later
681 pri = (struct iso_primary_descriptor *) sec;
684 if(sbi->s_high_sierra){
685 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
686 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
687 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
688 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
692 rootp = (struct iso_directory_record *) pri->root_directory_record;
693 sbi->s_nzones = isonum_733(pri->volume_space_size);
694 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
695 sbi->s_max_size = isonum_733(pri->volume_space_size);
698 sbi->s_ninodes = 0; /* No way to figure this out easily */
700 orig_zonesize = sbi->s_log_zone_size;
702 * If the zone size is smaller than the hardware sector size,
703 * this is a fatal error. This would occur if the disc drive
704 * had sectors that were 2048 bytes, but the filesystem had
705 * blocks that were 512 bytes (which should only very rarely
708 if (orig_zonesize < opt.blocksize)
711 /* RDE: convert log zone size to bit shift */
712 switch (sbi->s_log_zone_size) {
713 case 512: sbi->s_log_zone_size = 9; break;
714 case 1024: sbi->s_log_zone_size = 10; break;
715 case 2048: sbi->s_log_zone_size = 11; break;
718 goto out_bad_zone_size;
721 s->s_magic = ISOFS_SUPER_MAGIC;
722 s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
725 * The CDROM is read-only, has no nodes (devices) on it, and since
726 * all of the files appear to be owned by root, we really do not want
727 * to allow suid. (suid or devices will not show up unless we have
728 * Rock Ridge extensions)
731 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
733 /* Set this for reference. Its not currently used except on write
734 which we don't have .. */
736 first_data_zone = isonum_733(rootp->extent) +
737 isonum_711(rootp->ext_attr_length);
738 sbi->s_firstdatazone = first_data_zone;
740 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
741 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
742 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
743 if(sbi->s_high_sierra)
744 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
748 * If the Joliet level is set, we _may_ decide to use the
749 * secondary descriptor, but can't be sure until after we
750 * read the root inode. But before reading the root inode
751 * we may need to change the device blocksize, and would
752 * rather release the old buffer first. So, we cache the
753 * first_data_zone value from the secondary descriptor.
756 pri = (struct iso_primary_descriptor *) sec;
757 rootp = (struct iso_directory_record *)
758 pri->root_directory_record;
759 first_data_zone = isonum_733(rootp->extent) +
760 isonum_711(rootp->ext_attr_length);
764 * We're all done using the volume descriptor, and may need
765 * to change the device blocksize, so release the buffer now.
771 * Force the blocksize to 512 for 512 byte sectors. The file
772 * read primitives really get it wrong in a bad way if we don't
775 * Note - we should never be setting the blocksize to something
776 * less than the hardware sector size for the device. If we
777 * do, we would end up having to read larger buffers and split
778 * out portions to satisfy requests.
780 * Note2- the idea here is that we want to deal with the optimal
781 * zonesize in the filesystem. If we have it set to something less,
782 * then we have horrible problems with trying to piece together
783 * bits of adjacent blocks in order to properly read directory
784 * entries. By forcing the blocksize in this way, we ensure
785 * that we will never be required to do this.
787 sb_set_blocksize(s, orig_zonesize);
789 sbi->s_nls_iocharset = NULL;
792 if (joliet_level && opt.utf8 == 0) {
793 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
794 sbi->s_nls_iocharset = load_nls(p);
795 if (! sbi->s_nls_iocharset) {
796 /* Fail only if explicit charset specified */
799 sbi->s_nls_iocharset = load_nls_default();
803 s->s_op = &isofs_sops;
804 s->s_export_op = &isofs_export_ops;
805 sbi->s_mapping = opt.map;
806 sbi->s_rock = (opt.rock == 'y' ? 2 : 0);
807 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
808 sbi->s_cruft = opt.cruft;
809 sbi->s_hide = opt.hide;
810 sbi->s_showassoc = opt.showassoc;
811 sbi->s_uid = opt.uid;
812 sbi->s_gid = opt.gid;
813 sbi->s_utf8 = opt.utf8;
814 sbi->s_nocompress = opt.nocompress;
815 sbi->s_overriderockperm = opt.overriderockperm;
817 * It would be incredibly stupid to allow people to mark every file
818 * on the disk as suid, so we merely allow them to set the default
821 if (opt.fmode != ISOFS_INVALID_MODE)
822 sbi->s_fmode = opt.fmode & 0777;
824 sbi->s_fmode = ISOFS_INVALID_MODE;
825 if (opt.dmode != ISOFS_INVALID_MODE)
826 sbi->s_dmode = opt.dmode & 0777;
828 sbi->s_dmode = ISOFS_INVALID_MODE;
831 * Read the root inode, which _may_ result in changing
832 * the s_rock flag. Once we have the final s_rock value,
833 * we then decide whether to use the Joliet descriptor.
835 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
840 * If this disk has both Rock Ridge and Joliet on it, then we
841 * want to use Rock Ridge by default. This can be overridden
842 * by using the norock mount option. There is still one other
843 * possibility that is not taken into account: a Rock Ridge
844 * CD with Unicode names. Until someone sees such a beast, it
845 * will not be supported.
847 if (sbi->s_rock == 1) {
849 } else if (joliet_level) {
851 if (sbi->s_firstdatazone != first_data_zone) {
852 sbi->s_firstdatazone = first_data_zone;
854 "ISOFS: changing to secondary root\n");
856 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
862 if (opt.check == 'u') {
863 /* Only Joliet is case insensitive by default */
869 sbi->s_joliet_level = joliet_level;
871 /* Make sure the root inode is a directory */
872 if (!S_ISDIR(inode->i_mode)) {
874 "isofs_fill_super: root inode is not a directory. "
875 "Corrupted media?\n");
879 /* get the root dentry */
880 s->s_root = d_alloc_root(inode);
887 if (opt.check == 'r')
889 s->s_root->d_op = &isofs_dentry_ops[table];
891 kfree(opt.iocharset);
896 * Display error messages and free resources.
902 error = PTR_ERR(inode);
903 if (error != -ENOMEM)
904 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
907 if (sbi->s_nls_iocharset)
908 unload_nls(sbi->s_nls_iocharset);
912 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
913 __func__, s->s_id, iso_blknum, block);
916 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
917 sbi->s_log_zone_size);
920 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
921 orig_zonesize, opt.blocksize);
925 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
930 kfree(opt.iocharset);
936 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
938 struct super_block *sb = dentry->d_sb;
939 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
941 buf->f_type = ISOFS_SUPER_MAGIC;
942 buf->f_bsize = sb->s_blocksize;
943 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
944 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
947 buf->f_files = ISOFS_SB(sb)->s_ninodes;
949 buf->f_fsid.val[0] = (u32)id;
950 buf->f_fsid.val[1] = (u32)(id >> 32);
951 buf->f_namelen = NAME_MAX;
956 * Get a set of blocks; filling in buffer_heads if already allocated
957 * or getblk() if they are not. Returns the number of blocks inserted
960 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
961 struct buffer_head **bh, unsigned long nblocks)
964 unsigned offset, sect_size;
965 unsigned int firstext;
966 unsigned long nextblk, nextoff;
967 long iblock = (long)iblock_s;
968 int section, rv, error;
969 struct iso_inode_info *ei = ISOFS_I(inode);
975 if (iblock < 0 || iblock != iblock_s) {
976 printk(KERN_DEBUG "%s: block number too large\n", __func__);
983 firstext = ei->i_first_extent;
984 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
985 nextblk = ei->i_next_section_block;
986 nextoff = ei->i_next_section_offset;
990 /* If we are *way* beyond the end of the file, print a message.
991 * Access beyond the end of the file up to the next page boundary
992 * is normal, however because of the way the page cache works.
993 * In this case, we just return 0 so that we can properly fill
994 * the page with useless information without generating any
997 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
998 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
999 __func__, iblock, (unsigned long) inode->i_size);
1003 /* On the last section, nextblk == 0, section size is likely to
1004 * exceed sect_size by a partial block, and access beyond the
1005 * end of the file will reach beyond the section size, too.
1007 while (nextblk && (b_off >= (offset + sect_size))) {
1008 struct inode *ninode;
1010 offset += sect_size;
1011 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1012 if (IS_ERR(ninode)) {
1013 error = PTR_ERR(ninode);
1016 firstext = ISOFS_I(ninode)->i_first_extent;
1017 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1018 nextblk = ISOFS_I(ninode)->i_next_section_block;
1019 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1022 if (++section > 100) {
1023 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1024 " aborting...\n", __func__);
1025 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1026 "nextblk=%lu nextoff=%lu\n", __func__,
1027 iblock, firstext, (unsigned) sect_size,
1034 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1036 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1040 bh++; /* Next buffer head */
1041 b_off++; /* Next buffer offset */
1049 return rv != 0 ? rv : error;
1053 * Used by the standard interfaces.
1055 static int isofs_get_block(struct inode *inode, sector_t iblock,
1056 struct buffer_head *bh_result, int create)
1061 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1065 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1066 return ret < 0 ? ret : 0;
1069 static int isofs_bmap(struct inode *inode, sector_t block)
1071 struct buffer_head dummy;
1075 dummy.b_blocknr = -1000;
1076 error = isofs_get_block(inode, block, &dummy, 0);
1078 return dummy.b_blocknr;
1082 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1084 sector_t blknr = isofs_bmap(inode, block);
1087 return sb_bread(inode->i_sb, blknr);
1090 static int isofs_readpage(struct file *file, struct page *page)
1092 return block_read_full_page(page,isofs_get_block);
1095 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1097 return generic_block_bmap(mapping,block,isofs_get_block);
1100 static const struct address_space_operations isofs_aops = {
1101 .readpage = isofs_readpage,
1102 .sync_page = block_sync_page,
1106 static inline void test_and_set_uid(uid_t *p, uid_t value)
1112 static inline void test_and_set_gid(gid_t *p, gid_t value)
1118 static int isofs_read_level3_size(struct inode *inode)
1120 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1121 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1122 struct buffer_head *bh = NULL;
1123 unsigned long block, offset, block_saved, offset_saved;
1125 int more_entries = 0;
1126 struct iso_directory_record *tmpde = NULL;
1127 struct iso_inode_info *ei = ISOFS_I(inode);
1131 /* The first 16 blocks are reserved as the System Area. Thus,
1132 * no inodes can appear in block 0. We use this to flag that
1133 * this is the last section. */
1134 ei->i_next_section_block = 0;
1135 ei->i_next_section_offset = 0;
1137 block = ei->i_iget5_block;
1138 offset = ei->i_iget5_offset;
1141 struct iso_directory_record *de;
1142 unsigned int de_len;
1145 bh = sb_bread(inode->i_sb, block);
1149 de = (struct iso_directory_record *) (bh->b_data + offset);
1150 de_len = *(unsigned char *) de;
1160 block_saved = block;
1161 offset_saved = offset;
1164 /* Make sure we have a full directory entry */
1165 if (offset >= bufsize) {
1166 int slop = bufsize - offset + de_len;
1168 tmpde = kmalloc(256, GFP_KERNEL);
1172 memcpy(tmpde, de, slop);
1173 offset &= bufsize - 1;
1178 bh = sb_bread(inode->i_sb, block);
1181 memcpy((void *)tmpde+slop, bh->b_data, offset);
1186 inode->i_size += isonum_733(de->size);
1188 ei->i_next_section_block = block_saved;
1189 ei->i_next_section_offset = offset_saved;
1192 more_entries = de->flags[-high_sierra] & 0x80;
1197 } while (more_entries);
1210 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1215 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1216 "isofs_read_level3_size: inode=%lu\n",
1217 __func__, inode->i_ino);
1221 static int isofs_read_inode(struct inode *inode)
1223 struct super_block *sb = inode->i_sb;
1224 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1225 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1226 unsigned long block;
1227 int high_sierra = sbi->s_high_sierra;
1228 struct buffer_head *bh = NULL;
1229 struct iso_directory_record *de;
1230 struct iso_directory_record *tmpde = NULL;
1231 unsigned int de_len;
1232 unsigned long offset;
1233 struct iso_inode_info *ei = ISOFS_I(inode);
1236 block = ei->i_iget5_block;
1237 bh = sb_bread(inode->i_sb, block);
1241 offset = ei->i_iget5_offset;
1243 de = (struct iso_directory_record *) (bh->b_data + offset);
1244 de_len = *(unsigned char *) de;
1246 if (offset + de_len > bufsize) {
1247 int frag1 = bufsize - offset;
1249 tmpde = kmalloc(de_len, GFP_KERNEL);
1250 if (tmpde == NULL) {
1251 printk(KERN_INFO "%s: out of memory\n", __func__);
1255 memcpy(tmpde, bh->b_data + offset, frag1);
1257 bh = sb_bread(inode->i_sb, ++block);
1260 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1264 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1266 ISOFS_BUFFER_BITS(inode));
1268 /* Assume it is a normal-format file unless told otherwise */
1269 ei->i_file_format = isofs_file_normal;
1271 if (de->flags[-high_sierra] & 2) {
1272 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1273 inode->i_mode = S_IFDIR | sbi->s_dmode;
1275 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1276 inode->i_nlink = 1; /*
1277 * Set to 1. We know there are 2, but
1278 * the find utility tries to optimize
1279 * if it is 2, and it screws up. It is
1280 * easier to give 1 which tells find to
1281 * do it the hard way.
1284 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1285 inode->i_mode = S_IFREG | sbi->s_fmode;
1288 * Set default permissions: r-x for all. The disc
1289 * could be shared with DOS machines so virtually
1290 * anything could be a valid executable.
1292 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1296 inode->i_uid = sbi->s_uid;
1297 inode->i_gid = sbi->s_gid;
1298 inode->i_blocks = 0;
1300 ei->i_format_parm[0] = 0;
1301 ei->i_format_parm[1] = 0;
1302 ei->i_format_parm[2] = 0;
1304 ei->i_section_size = isonum_733(de->size);
1305 if (de->flags[-high_sierra] & 0x80) {
1306 ret = isofs_read_level3_size(inode);
1311 ei->i_next_section_block = 0;
1312 ei->i_next_section_offset = 0;
1313 inode->i_size = isonum_733(de->size);
1317 * Some dipshit decided to store some other bit of information
1318 * in the high byte of the file length. Truncate size in case
1319 * this CDROM was mounted with the cruft option.
1322 if (sbi->s_cruft == 'y')
1323 inode->i_size &= 0x00ffffff;
1325 if (de->interleave[0]) {
1326 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1330 /* I have no idea what file_unit_size is used for, so
1331 we will flag it for now */
1332 if (de->file_unit_size[0] != 0) {
1333 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1337 /* I have no idea what other flag bits are used for, so
1338 we will flag it for now */
1340 if((de->flags[-high_sierra] & ~2)!= 0){
1341 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1343 inode->i_ino, de->flags[-high_sierra]);
1347 inode->i_mtime.tv_sec =
1348 inode->i_atime.tv_sec =
1349 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1350 inode->i_mtime.tv_nsec =
1351 inode->i_atime.tv_nsec =
1352 inode->i_ctime.tv_nsec = 0;
1354 ei->i_first_extent = (isonum_733(de->extent) +
1355 isonum_711(de->ext_attr_length));
1357 /* Set the number of blocks for stat() - should be done before RR */
1358 inode->i_blocks = (inode->i_size + 511) >> 9;
1361 * Now test for possible Rock Ridge extensions which will override
1362 * some of these numbers in the inode structure.
1366 parse_rock_ridge_inode(de, inode);
1367 /* if we want uid/gid set, override the rock ridge setting */
1368 test_and_set_uid(&inode->i_uid, sbi->s_uid);
1369 test_and_set_gid(&inode->i_gid, sbi->s_gid);
1371 /* Now set final access rights if overriding rock ridge setting */
1372 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1373 sbi->s_dmode != ISOFS_INVALID_MODE)
1374 inode->i_mode = S_IFDIR | sbi->s_dmode;
1375 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1376 sbi->s_fmode != ISOFS_INVALID_MODE)
1377 inode->i_mode = S_IFREG | sbi->s_fmode;
1379 /* Install the inode operations vector */
1380 if (S_ISREG(inode->i_mode)) {
1381 inode->i_fop = &generic_ro_fops;
1382 switch (ei->i_file_format) {
1383 #ifdef CONFIG_ZISOFS
1384 case isofs_file_compressed:
1385 inode->i_data.a_ops = &zisofs_aops;
1389 inode->i_data.a_ops = &isofs_aops;
1392 } else if (S_ISDIR(inode->i_mode)) {
1393 inode->i_op = &isofs_dir_inode_operations;
1394 inode->i_fop = &isofs_dir_operations;
1395 } else if (S_ISLNK(inode->i_mode)) {
1396 inode->i_op = &page_symlink_inode_operations;
1397 inode->i_data.a_ops = &isofs_symlink_aops;
1399 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1400 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1410 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1415 struct isofs_iget5_callback_data {
1416 unsigned long block;
1417 unsigned long offset;
1420 static int isofs_iget5_test(struct inode *ino, void *data)
1422 struct iso_inode_info *i = ISOFS_I(ino);
1423 struct isofs_iget5_callback_data *d =
1424 (struct isofs_iget5_callback_data*)data;
1425 return (i->i_iget5_block == d->block)
1426 && (i->i_iget5_offset == d->offset);
1429 static int isofs_iget5_set(struct inode *ino, void *data)
1431 struct iso_inode_info *i = ISOFS_I(ino);
1432 struct isofs_iget5_callback_data *d =
1433 (struct isofs_iget5_callback_data*)data;
1434 i->i_iget5_block = d->block;
1435 i->i_iget5_offset = d->offset;
1439 /* Store, in the inode's containing structure, the block and block
1440 * offset that point to the underlying meta-data for the inode. The
1441 * code below is otherwise similar to the iget() code in
1442 * include/linux/fs.h */
1443 struct inode *isofs_iget(struct super_block *sb,
1444 unsigned long block,
1445 unsigned long offset)
1447 unsigned long hashval;
1448 struct inode *inode;
1449 struct isofs_iget5_callback_data data;
1452 if (offset >= 1ul << sb->s_blocksize_bits)
1453 return ERR_PTR(-EINVAL);
1456 data.offset = offset;
1458 hashval = (block << sb->s_blocksize_bits) | offset;
1460 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1461 &isofs_iget5_set, &data);
1464 return ERR_PTR(-ENOMEM);
1466 if (inode->i_state & I_NEW) {
1467 ret = isofs_read_inode(inode);
1470 inode = ERR_PTR(ret);
1472 unlock_new_inode(inode);
1479 static int isofs_get_sb(struct file_system_type *fs_type,
1480 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1482 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1486 static struct file_system_type iso9660_fs_type = {
1487 .owner = THIS_MODULE,
1489 .get_sb = isofs_get_sb,
1490 .kill_sb = kill_block_super,
1491 .fs_flags = FS_REQUIRES_DEV,
1494 static int __init init_iso9660_fs(void)
1496 int err = init_inodecache();
1499 #ifdef CONFIG_ZISOFS
1500 err = zisofs_init();
1504 err = register_filesystem(&iso9660_fs_type);
1509 #ifdef CONFIG_ZISOFS
1513 destroy_inodecache();
1518 static void __exit exit_iso9660_fs(void)
1520 unregister_filesystem(&iso9660_fs_type);
1521 #ifdef CONFIG_ZISOFS
1524 destroy_inodecache();
1527 module_init(init_iso9660_fs)
1528 module_exit(exit_iso9660_fs)
1529 MODULE_LICENSE("GPL");
1530 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1531 MODULE_ALIAS("iso9660");