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);
46 if (sbi->s_nls_iocharset) {
47 unload_nls(sbi->s_nls_iocharset);
48 sbi->s_nls_iocharset = NULL;
57 static int isofs_read_inode(struct inode *);
58 static int isofs_statfs (struct dentry *, struct kstatfs *);
60 static struct kmem_cache *isofs_inode_cachep;
62 static struct inode *isofs_alloc_inode(struct super_block *sb)
64 struct iso_inode_info *ei;
65 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
68 return &ei->vfs_inode;
71 static void isofs_destroy_inode(struct inode *inode)
73 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
76 static void init_once(struct kmem_cache *cachep, void *foo)
78 struct iso_inode_info *ei = foo;
80 inode_init_once(&ei->vfs_inode);
83 static int init_inodecache(void)
85 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
86 sizeof(struct iso_inode_info),
87 0, (SLAB_RECLAIM_ACCOUNT|
90 if (isofs_inode_cachep == NULL)
95 static void destroy_inodecache(void)
97 kmem_cache_destroy(isofs_inode_cachep);
100 static int isofs_remount(struct super_block *sb, int *flags, char *data)
102 /* we probably want a lot more here */
107 static const struct super_operations isofs_sops = {
108 .alloc_inode = isofs_alloc_inode,
109 .destroy_inode = isofs_destroy_inode,
110 .put_super = isofs_put_super,
111 .statfs = isofs_statfs,
112 .remount_fs = isofs_remount,
116 static struct dentry_operations isofs_dentry_ops[] = {
118 .d_hash = isofs_hash,
119 .d_compare = isofs_dentry_cmp,
122 .d_hash = isofs_hashi,
123 .d_compare = isofs_dentry_cmpi,
127 .d_hash = isofs_hash_ms,
128 .d_compare = isofs_dentry_cmp_ms,
131 .d_hash = isofs_hashi_ms,
132 .d_compare = isofs_dentry_cmpi_ms,
137 struct iso9660_options{
146 unsigned int blocksize;
159 * Compute the hash for the isofs name corresponding to the dentry.
162 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
170 while (len && name[len-1] == '.')
174 qstr->hash = full_name_hash(name, len);
180 * Compute the hash for the isofs name corresponding to the dentry.
183 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
193 while (len && name[len-1] == '.')
197 hash = init_name_hash();
199 c = tolower(*name++);
200 hash = partial_name_hash(c, hash);
202 qstr->hash = end_name_hash(hash);
208 * Case insensitive compare of two isofs names.
210 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
211 struct qstr *b, int ms)
215 /* A filename cannot end in '.' or we treat it like it has none */
219 while (alen && a->name[alen-1] == '.')
221 while (blen && b->name[blen-1] == '.')
225 if (strnicmp(a->name, b->name, alen) == 0)
232 * Case sensitive compare of two isofs names.
234 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
235 struct qstr *b, int ms)
239 /* A filename cannot end in '.' or we treat it like it has none */
243 while (alen && a->name[alen-1] == '.')
245 while (blen && b->name[blen-1] == '.')
249 if (strncmp(a->name, b->name, alen) == 0)
256 isofs_hash(struct dentry *dentry, struct qstr *qstr)
258 return isofs_hash_common(dentry, qstr, 0);
262 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
264 return isofs_hashi_common(dentry, qstr, 0);
268 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
270 return isofs_dentry_cmp_common(dentry, a, b, 0);
274 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
276 return isofs_dentry_cmpi_common(dentry, a, b, 0);
281 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
283 return isofs_hash_common(dentry, qstr, 1);
287 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
289 return isofs_hashi_common(dentry, qstr, 1);
293 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
295 return isofs_dentry_cmp_common(dentry, a, b, 1);
299 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
301 return isofs_dentry_cmpi_common(dentry, a, b, 1);
306 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
307 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
308 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
309 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode,
312 static match_table_t tokens = {
313 {Opt_norock, "norock"},
314 {Opt_nojoliet, "nojoliet"},
315 {Opt_unhide, "unhide"},
317 {Opt_showassoc, "showassoc"},
318 {Opt_cruft, "cruft"},
320 {Opt_iocharset, "iocharset=%s"},
321 {Opt_map_a, "map=acorn"},
322 {Opt_map_a, "map=a"},
323 {Opt_map_n, "map=normal"},
324 {Opt_map_n, "map=n"},
325 {Opt_map_o, "map=off"},
326 {Opt_map_o, "map=o"},
327 {Opt_session, "session=%u"},
328 {Opt_sb, "sbsector=%u"},
329 {Opt_check_r, "check=relaxed"},
330 {Opt_check_r, "check=r"},
331 {Opt_check_s, "check=strict"},
332 {Opt_check_s, "check=s"},
335 {Opt_mode, "mode=%u"},
336 {Opt_dmode, "dmode=%u"},
337 {Opt_block, "block=%u"},
338 {Opt_ignore, "conv=binary"},
339 {Opt_ignore, "conv=b"},
340 {Opt_ignore, "conv=text"},
341 {Opt_ignore, "conv=t"},
342 {Opt_ignore, "conv=mtext"},
343 {Opt_ignore, "conv=m"},
344 {Opt_ignore, "conv=auto"},
345 {Opt_ignore, "conv=a"},
346 {Opt_nocompress, "nocompress"},
350 static int parse_options(char *options, struct iso9660_options *popt)
360 popt->showassoc = 'n';
361 popt->check = 'u'; /* unset */
362 popt->nocompress = 0;
363 popt->blocksize = 1024;
364 popt->fmode = popt->dmode = S_IRUGO | S_IXUGO; /*
365 * r-x for all. The disc could
366 * be shared with DOS machines so
367 * virtually anything could be
368 * a valid executable.
372 popt->iocharset = NULL;
379 while ((p = strsep(&options, ",")) != NULL) {
381 substring_t args[MAX_OPT_ARGS];
387 token = match_token(p, tokens, args);
400 popt->showassoc = 'y';
410 popt->iocharset = match_strdup(&args[0]);
423 if (match_int(&args[0], &option))
428 popt->session = n + 1;
431 if (match_int(&args[0], &option))
433 popt->sbsector = option;
444 if (match_int(&args[0], &option))
449 if (match_int(&args[0], &option))
454 if (match_int(&args[0], &option))
456 popt->fmode = option;
459 if (match_int(&args[0], &option))
461 popt->dmode = option;
464 if (match_int(&args[0], &option))
467 if (n != 512 && n != 1024 && n != 2048)
472 popt->nocompress = 1;
482 * look if the driver can tell the multi session redirection value
484 * don't change this if you don't know what you do, please!
485 * Multisession is legal only with XA disks.
486 * A non-XA disk with more than one volume descriptor may do it right, but
487 * usually is written in a nowhere standardized "multi-partition" manner.
488 * Multisession uses absolute addressing (solely the first frame of the whole
489 * track is #0), multi-partition uses relative addressing (each first frame of
490 * each track is #0), and a track is not a session.
492 * A broken CDwriter software or drive firmware does not set new standards,
493 * at least not if conflicting with the existing ones.
497 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
499 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
501 struct cdrom_multisession ms_info;
502 unsigned int vol_desc_start;
503 struct block_device *bdev = sb->s_bdev;
507 ms_info.addr_format=CDROM_LBA;
508 if(session >= 0 && session <= 99) {
509 struct cdrom_tocentry Te;
510 Te.cdte_track=session;
511 Te.cdte_format=CDROM_LBA;
512 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
514 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
515 session, Te.cdte_addr.lba,
516 Te.cdte_ctrl&CDROM_DATA_TRACK);
517 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
518 return Te.cdte_addr.lba;
521 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
523 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
525 printk(KERN_ERR "ISOFS: Invalid session number\n");
527 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
529 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
530 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
534 #if WE_OBEY_THE_WRITTEN_STANDARDS
535 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
537 vol_desc_start=ms_info.addr.lba;
538 return vol_desc_start;
542 * Initialize the superblock and read the root inode.
544 * Note: a check_disk_change() has been done immediately prior
545 * to this call, so we don't need to check again.
547 static int isofs_fill_super(struct super_block *s, void *data, int silent)
549 struct buffer_head *bh = NULL, *pri_bh = NULL;
550 struct hs_primary_descriptor *h_pri = NULL;
551 struct iso_primary_descriptor *pri = NULL;
552 struct iso_supplementary_descriptor *sec = NULL;
553 struct iso_directory_record *rootp;
555 struct iso9660_options opt;
556 struct isofs_sb_info *sbi;
557 unsigned long first_data_zone;
558 int joliet_level = 0;
559 int iso_blknum, block;
561 int table, error = -EINVAL;
562 unsigned int vol_desc_start;
564 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
569 if (!parse_options((char *)data, &opt))
573 * First of all, get the hardware blocksize for this device.
574 * If we don't know what it is, or the hardware blocksize is
575 * larger than the blocksize the user specified, then use
579 * What if bugger tells us to go beyond page size?
581 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
583 sbi->s_high_sierra = 0; /* default is iso9660 */
585 vol_desc_start = (opt.sbsector != -1) ?
586 opt.sbsector : isofs_get_last_session(s,opt.session);
588 for (iso_blknum = vol_desc_start+16;
589 iso_blknum < vol_desc_start+100; iso_blknum++) {
590 struct hs_volume_descriptor *hdp;
591 struct iso_volume_descriptor *vdp;
593 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
594 if (!(bh = sb_bread(s, block)))
597 vdp = (struct iso_volume_descriptor *)bh->b_data;
598 hdp = (struct hs_volume_descriptor *)bh->b_data;
601 * Due to the overlapping physical location of the descriptors,
602 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
603 * proper identification in this case, we first check for ISO.
605 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
606 if (isonum_711(vdp->type) == ISO_VD_END)
608 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
610 pri = (struct iso_primary_descriptor *)vdp;
611 /* Save the buffer in case we need it ... */
617 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
618 sec = (struct iso_supplementary_descriptor *)vdp;
619 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
620 if (opt.joliet == 'y') {
621 if (sec->escape[2] == 0x40)
623 else if (sec->escape[2] == 0x43)
625 else if (sec->escape[2] == 0x45)
628 printk(KERN_DEBUG "ISO 9660 Extensions: "
629 "Microsoft Joliet Level %d\n",
634 /* Unknown supplementary volume descriptor */
640 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
641 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
644 sbi->s_high_sierra = 1;
646 h_pri = (struct hs_primary_descriptor *)vdp;
651 /* Just skip any volume descriptors we don't recognize */
657 * If we fall through, either no volume descriptor was found,
658 * or else we passed a primary descriptor looking for others.
661 goto out_unknown_format;
668 if (joliet_level && (pri == NULL || opt.rock == 'n')) {
669 /* This is the case of Joliet with the norock mount flag.
670 * A disc with both Joliet and Rock Ridge is handled later
672 pri = (struct iso_primary_descriptor *) sec;
675 if(sbi->s_high_sierra){
676 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
677 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
678 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
679 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
683 rootp = (struct iso_directory_record *) pri->root_directory_record;
684 sbi->s_nzones = isonum_733(pri->volume_space_size);
685 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
686 sbi->s_max_size = isonum_733(pri->volume_space_size);
689 sbi->s_ninodes = 0; /* No way to figure this out easily */
691 orig_zonesize = sbi->s_log_zone_size;
693 * If the zone size is smaller than the hardware sector size,
694 * this is a fatal error. This would occur if the disc drive
695 * had sectors that were 2048 bytes, but the filesystem had
696 * blocks that were 512 bytes (which should only very rarely
699 if (orig_zonesize < opt.blocksize)
702 /* RDE: convert log zone size to bit shift */
703 switch (sbi->s_log_zone_size) {
704 case 512: sbi->s_log_zone_size = 9; break;
705 case 1024: sbi->s_log_zone_size = 10; break;
706 case 2048: sbi->s_log_zone_size = 11; break;
709 goto out_bad_zone_size;
712 s->s_magic = ISOFS_SUPER_MAGIC;
713 s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
716 * The CDROM is read-only, has no nodes (devices) on it, and since
717 * all of the files appear to be owned by root, we really do not want
718 * to allow suid. (suid or devices will not show up unless we have
719 * Rock Ridge extensions)
722 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
724 /* Set this for reference. Its not currently used except on write
725 which we don't have .. */
727 first_data_zone = isonum_733(rootp->extent) +
728 isonum_711(rootp->ext_attr_length);
729 sbi->s_firstdatazone = first_data_zone;
731 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
732 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
733 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
734 if(sbi->s_high_sierra)
735 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
739 * If the Joliet level is set, we _may_ decide to use the
740 * secondary descriptor, but can't be sure until after we
741 * read the root inode. But before reading the root inode
742 * we may need to change the device blocksize, and would
743 * rather release the old buffer first. So, we cache the
744 * first_data_zone value from the secondary descriptor.
747 pri = (struct iso_primary_descriptor *) sec;
748 rootp = (struct iso_directory_record *)
749 pri->root_directory_record;
750 first_data_zone = isonum_733(rootp->extent) +
751 isonum_711(rootp->ext_attr_length);
755 * We're all done using the volume descriptor, and may need
756 * to change the device blocksize, so release the buffer now.
762 * Force the blocksize to 512 for 512 byte sectors. The file
763 * read primitives really get it wrong in a bad way if we don't
766 * Note - we should never be setting the blocksize to something
767 * less than the hardware sector size for the device. If we
768 * do, we would end up having to read larger buffers and split
769 * out portions to satisfy requests.
771 * Note2- the idea here is that we want to deal with the optimal
772 * zonesize in the filesystem. If we have it set to something less,
773 * then we have horrible problems with trying to piece together
774 * bits of adjacent blocks in order to properly read directory
775 * entries. By forcing the blocksize in this way, we ensure
776 * that we will never be required to do this.
778 sb_set_blocksize(s, orig_zonesize);
780 sbi->s_nls_iocharset = NULL;
783 if (joliet_level && opt.utf8 == 0) {
784 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
785 sbi->s_nls_iocharset = load_nls(p);
786 if (! sbi->s_nls_iocharset) {
787 /* Fail only if explicit charset specified */
790 sbi->s_nls_iocharset = load_nls_default();
794 s->s_op = &isofs_sops;
795 s->s_export_op = &isofs_export_ops;
796 sbi->s_mapping = opt.map;
797 sbi->s_rock = (opt.rock == 'y' ? 2 : 0);
798 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
799 sbi->s_cruft = opt.cruft;
800 sbi->s_hide = opt.hide;
801 sbi->s_showassoc = opt.showassoc;
802 sbi->s_uid = opt.uid;
803 sbi->s_gid = opt.gid;
804 sbi->s_utf8 = opt.utf8;
805 sbi->s_nocompress = opt.nocompress;
807 * It would be incredibly stupid to allow people to mark every file
808 * on the disk as suid, so we merely allow them to set the default
811 sbi->s_fmode = opt.fmode & 0777;
812 sbi->s_dmode = opt.dmode & 0777;
815 * Read the root inode, which _may_ result in changing
816 * the s_rock flag. Once we have the final s_rock value,
817 * we then decide whether to use the Joliet descriptor.
819 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
824 * If this disk has both Rock Ridge and Joliet on it, then we
825 * want to use Rock Ridge by default. This can be overridden
826 * by using the norock mount option. There is still one other
827 * possibility that is not taken into account: a Rock Ridge
828 * CD with Unicode names. Until someone sees such a beast, it
829 * will not be supported.
831 if (sbi->s_rock == 1) {
833 } else if (joliet_level) {
835 if (sbi->s_firstdatazone != first_data_zone) {
836 sbi->s_firstdatazone = first_data_zone;
838 "ISOFS: changing to secondary root\n");
840 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
846 if (opt.check == 'u') {
847 /* Only Joliet is case insensitive by default */
853 sbi->s_joliet_level = joliet_level;
855 /* check the root inode */
859 /* Make sure the root inode is a directory */
860 if (!S_ISDIR(inode->i_mode)) {
862 "isofs_fill_super: root inode is not a directory. "
863 "Corrupted media?\n");
867 /* get the root dentry */
868 s->s_root = d_alloc_root(inode);
875 if (opt.check == 'r')
877 s->s_root->d_op = &isofs_dentry_ops[table];
879 kfree(opt.iocharset);
884 * Display error messages and free resources.
887 printk(KERN_WARNING "%s: root inode not initialized\n", __func__);
892 error = PTR_ERR(inode);
893 if (error != -ENOMEM)
894 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
897 if (sbi->s_nls_iocharset)
898 unload_nls(sbi->s_nls_iocharset);
902 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
903 __func__, s->s_id, iso_blknum, block);
906 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
907 sbi->s_log_zone_size);
910 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
911 orig_zonesize, opt.blocksize);
915 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
920 kfree(opt.iocharset);
926 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
928 struct super_block *sb = dentry->d_sb;
930 buf->f_type = ISOFS_SUPER_MAGIC;
931 buf->f_bsize = sb->s_blocksize;
932 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
933 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
936 buf->f_files = ISOFS_SB(sb)->s_ninodes;
938 buf->f_namelen = NAME_MAX;
943 * Get a set of blocks; filling in buffer_heads if already allocated
944 * or getblk() if they are not. Returns the number of blocks inserted
947 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
948 struct buffer_head **bh, unsigned long nblocks)
951 unsigned offset, sect_size;
952 unsigned int firstext;
953 unsigned long nextblk, nextoff;
954 long iblock = (long)iblock_s;
955 int section, rv, error;
956 struct iso_inode_info *ei = ISOFS_I(inode);
962 if (iblock < 0 || iblock != iblock_s) {
963 printk(KERN_DEBUG "%s: block number too large\n", __func__);
970 firstext = ei->i_first_extent;
971 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
972 nextblk = ei->i_next_section_block;
973 nextoff = ei->i_next_section_offset;
977 /* If we are *way* beyond the end of the file, print a message.
978 * Access beyond the end of the file up to the next page boundary
979 * is normal, however because of the way the page cache works.
980 * In this case, we just return 0 so that we can properly fill
981 * the page with useless information without generating any
984 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
985 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
986 __func__, iblock, (unsigned long) inode->i_size);
990 /* On the last section, nextblk == 0, section size is likely to
991 * exceed sect_size by a partial block, and access beyond the
992 * end of the file will reach beyond the section size, too.
994 while (nextblk && (b_off >= (offset + sect_size))) {
995 struct inode *ninode;
998 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
999 if (IS_ERR(ninode)) {
1000 error = PTR_ERR(ninode);
1003 firstext = ISOFS_I(ninode)->i_first_extent;
1004 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1005 nextblk = ISOFS_I(ninode)->i_next_section_block;
1006 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1009 if (++section > 100) {
1010 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1011 " aborting...\n", __func__);
1012 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1013 "nextblk=%lu nextoff=%lu\n", __func__,
1014 iblock, firstext, (unsigned) sect_size,
1021 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1023 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1027 bh++; /* Next buffer head */
1028 b_off++; /* Next buffer offset */
1036 return rv != 0 ? rv : error;
1040 * Used by the standard interfaces.
1042 static int isofs_get_block(struct inode *inode, sector_t iblock,
1043 struct buffer_head *bh_result, int create)
1048 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1052 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1053 return ret < 0 ? ret : 0;
1056 static int isofs_bmap(struct inode *inode, sector_t block)
1058 struct buffer_head dummy;
1062 dummy.b_blocknr = -1000;
1063 error = isofs_get_block(inode, block, &dummy, 0);
1065 return dummy.b_blocknr;
1069 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1071 sector_t blknr = isofs_bmap(inode, block);
1074 return sb_bread(inode->i_sb, blknr);
1077 static int isofs_readpage(struct file *file, struct page *page)
1079 return block_read_full_page(page,isofs_get_block);
1082 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1084 return generic_block_bmap(mapping,block,isofs_get_block);
1087 static const struct address_space_operations isofs_aops = {
1088 .readpage = isofs_readpage,
1089 .sync_page = block_sync_page,
1093 static inline void test_and_set_uid(uid_t *p, uid_t value)
1099 static inline void test_and_set_gid(gid_t *p, gid_t value)
1105 static int isofs_read_level3_size(struct inode *inode)
1107 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1108 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1109 struct buffer_head *bh = NULL;
1110 unsigned long block, offset, block_saved, offset_saved;
1112 int more_entries = 0;
1113 struct iso_directory_record *tmpde = NULL;
1114 struct iso_inode_info *ei = ISOFS_I(inode);
1118 /* The first 16 blocks are reserved as the System Area. Thus,
1119 * no inodes can appear in block 0. We use this to flag that
1120 * this is the last section. */
1121 ei->i_next_section_block = 0;
1122 ei->i_next_section_offset = 0;
1124 block = ei->i_iget5_block;
1125 offset = ei->i_iget5_offset;
1128 struct iso_directory_record *de;
1129 unsigned int de_len;
1132 bh = sb_bread(inode->i_sb, block);
1136 de = (struct iso_directory_record *) (bh->b_data + offset);
1137 de_len = *(unsigned char *) de;
1147 block_saved = block;
1148 offset_saved = offset;
1151 /* Make sure we have a full directory entry */
1152 if (offset >= bufsize) {
1153 int slop = bufsize - offset + de_len;
1155 tmpde = kmalloc(256, GFP_KERNEL);
1159 memcpy(tmpde, de, slop);
1160 offset &= bufsize - 1;
1165 bh = sb_bread(inode->i_sb, block);
1168 memcpy((void *)tmpde+slop, bh->b_data, offset);
1173 inode->i_size += isonum_733(de->size);
1175 ei->i_next_section_block = block_saved;
1176 ei->i_next_section_offset = offset_saved;
1179 more_entries = de->flags[-high_sierra] & 0x80;
1184 } while (more_entries);
1197 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1202 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1203 "isofs_read_level3_size: inode=%lu\n",
1204 __func__, inode->i_ino);
1208 static int isofs_read_inode(struct inode *inode)
1210 struct super_block *sb = inode->i_sb;
1211 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1212 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1213 unsigned long block;
1214 int high_sierra = sbi->s_high_sierra;
1215 struct buffer_head *bh = NULL;
1216 struct iso_directory_record *de;
1217 struct iso_directory_record *tmpde = NULL;
1218 unsigned int de_len;
1219 unsigned long offset;
1220 struct iso_inode_info *ei = ISOFS_I(inode);
1223 block = ei->i_iget5_block;
1224 bh = sb_bread(inode->i_sb, block);
1228 offset = ei->i_iget5_offset;
1230 de = (struct iso_directory_record *) (bh->b_data + offset);
1231 de_len = *(unsigned char *) de;
1233 if (offset + de_len > bufsize) {
1234 int frag1 = bufsize - offset;
1236 tmpde = kmalloc(de_len, GFP_KERNEL);
1237 if (tmpde == NULL) {
1238 printk(KERN_INFO "%s: out of memory\n", __func__);
1242 memcpy(tmpde, bh->b_data + offset, frag1);
1244 bh = sb_bread(inode->i_sb, ++block);
1247 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1251 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1253 ISOFS_BUFFER_BITS(inode));
1255 /* Assume it is a normal-format file unless told otherwise */
1256 ei->i_file_format = isofs_file_normal;
1258 if (de->flags[-high_sierra] & 2) {
1259 inode->i_mode = sbi->s_dmode | S_IFDIR;
1260 inode->i_nlink = 1; /*
1261 * Set to 1. We know there are 2, but
1262 * the find utility tries to optimize
1263 * if it is 2, and it screws up. It is
1264 * easier to give 1 which tells find to
1265 * do it the hard way.
1268 /* Everybody gets to read the file. */
1269 inode->i_mode = sbi->s_fmode | S_IFREG;
1272 inode->i_uid = sbi->s_uid;
1273 inode->i_gid = sbi->s_gid;
1274 inode->i_blocks = 0;
1276 ei->i_format_parm[0] = 0;
1277 ei->i_format_parm[1] = 0;
1278 ei->i_format_parm[2] = 0;
1280 ei->i_section_size = isonum_733(de->size);
1281 if (de->flags[-high_sierra] & 0x80) {
1282 ret = isofs_read_level3_size(inode);
1287 ei->i_next_section_block = 0;
1288 ei->i_next_section_offset = 0;
1289 inode->i_size = isonum_733(de->size);
1293 * Some dipshit decided to store some other bit of information
1294 * in the high byte of the file length. Truncate size in case
1295 * this CDROM was mounted with the cruft option.
1298 if (sbi->s_cruft == 'y')
1299 inode->i_size &= 0x00ffffff;
1301 if (de->interleave[0]) {
1302 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1306 /* I have no idea what file_unit_size is used for, so
1307 we will flag it for now */
1308 if (de->file_unit_size[0] != 0) {
1309 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1313 /* I have no idea what other flag bits are used for, so
1314 we will flag it for now */
1316 if((de->flags[-high_sierra] & ~2)!= 0){
1317 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1319 inode->i_ino, de->flags[-high_sierra]);
1323 inode->i_mtime.tv_sec =
1324 inode->i_atime.tv_sec =
1325 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1326 inode->i_mtime.tv_nsec =
1327 inode->i_atime.tv_nsec =
1328 inode->i_ctime.tv_nsec = 0;
1330 ei->i_first_extent = (isonum_733(de->extent) +
1331 isonum_711(de->ext_attr_length));
1333 /* Set the number of blocks for stat() - should be done before RR */
1334 inode->i_blocks = (inode->i_size + 511) >> 9;
1337 * Now test for possible Rock Ridge extensions which will override
1338 * some of these numbers in the inode structure.
1342 parse_rock_ridge_inode(de, inode);
1343 /* if we want uid/gid set, override the rock ridge setting */
1344 test_and_set_uid(&inode->i_uid, sbi->s_uid);
1345 test_and_set_gid(&inode->i_gid, sbi->s_gid);
1348 /* Install the inode operations vector */
1349 if (S_ISREG(inode->i_mode)) {
1350 inode->i_fop = &generic_ro_fops;
1351 switch (ei->i_file_format) {
1352 #ifdef CONFIG_ZISOFS
1353 case isofs_file_compressed:
1354 inode->i_data.a_ops = &zisofs_aops;
1358 inode->i_data.a_ops = &isofs_aops;
1361 } else if (S_ISDIR(inode->i_mode)) {
1362 inode->i_op = &isofs_dir_inode_operations;
1363 inode->i_fop = &isofs_dir_operations;
1364 } else if (S_ISLNK(inode->i_mode)) {
1365 inode->i_op = &page_symlink_inode_operations;
1366 inode->i_data.a_ops = &isofs_symlink_aops;
1368 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1369 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1379 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1384 struct isofs_iget5_callback_data {
1385 unsigned long block;
1386 unsigned long offset;
1389 static int isofs_iget5_test(struct inode *ino, void *data)
1391 struct iso_inode_info *i = ISOFS_I(ino);
1392 struct isofs_iget5_callback_data *d =
1393 (struct isofs_iget5_callback_data*)data;
1394 return (i->i_iget5_block == d->block)
1395 && (i->i_iget5_offset == d->offset);
1398 static int isofs_iget5_set(struct inode *ino, void *data)
1400 struct iso_inode_info *i = ISOFS_I(ino);
1401 struct isofs_iget5_callback_data *d =
1402 (struct isofs_iget5_callback_data*)data;
1403 i->i_iget5_block = d->block;
1404 i->i_iget5_offset = d->offset;
1408 /* Store, in the inode's containing structure, the block and block
1409 * offset that point to the underlying meta-data for the inode. The
1410 * code below is otherwise similar to the iget() code in
1411 * include/linux/fs.h */
1412 struct inode *isofs_iget(struct super_block *sb,
1413 unsigned long block,
1414 unsigned long offset)
1416 unsigned long hashval;
1417 struct inode *inode;
1418 struct isofs_iget5_callback_data data;
1421 if (offset >= 1ul << sb->s_blocksize_bits)
1422 return ERR_PTR(-EINVAL);
1425 data.offset = offset;
1427 hashval = (block << sb->s_blocksize_bits) | offset;
1429 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1430 &isofs_iget5_set, &data);
1433 return ERR_PTR(-ENOMEM);
1435 if (inode->i_state & I_NEW) {
1436 ret = isofs_read_inode(inode);
1439 inode = ERR_PTR(ret);
1441 unlock_new_inode(inode);
1448 static int isofs_get_sb(struct file_system_type *fs_type,
1449 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1451 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1455 static struct file_system_type iso9660_fs_type = {
1456 .owner = THIS_MODULE,
1458 .get_sb = isofs_get_sb,
1459 .kill_sb = kill_block_super,
1460 .fs_flags = FS_REQUIRES_DEV,
1463 static int __init init_iso9660_fs(void)
1465 int err = init_inodecache();
1468 #ifdef CONFIG_ZISOFS
1469 err = zisofs_init();
1473 err = register_filesystem(&iso9660_fs_type);
1478 #ifdef CONFIG_ZISOFS
1482 destroy_inodecache();
1487 static void __exit exit_iso9660_fs(void)
1489 unregister_filesystem(&iso9660_fs_type);
1490 #ifdef CONFIG_ZISOFS
1493 destroy_inodecache();
1496 module_init(init_iso9660_fs)
1497 module_exit(exit_iso9660_fs)
1498 MODULE_LICENSE("GPL");
1499 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1500 MODULE_ALIAS("iso9660");