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,
113 .show_options = generic_show_options,
117 static struct dentry_operations isofs_dentry_ops[] = {
119 .d_hash = isofs_hash,
120 .d_compare = isofs_dentry_cmp,
123 .d_hash = isofs_hashi,
124 .d_compare = isofs_dentry_cmpi,
128 .d_hash = isofs_hash_ms,
129 .d_compare = isofs_dentry_cmp_ms,
132 .d_hash = isofs_hashi_ms,
133 .d_compare = isofs_dentry_cmpi_ms,
138 struct iso9660_options{
147 unsigned int blocksize;
160 * Compute the hash for the isofs name corresponding to the dentry.
163 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
171 while (len && name[len-1] == '.')
175 qstr->hash = full_name_hash(name, len);
181 * Compute the hash for the isofs name corresponding to the dentry.
184 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
194 while (len && name[len-1] == '.')
198 hash = init_name_hash();
200 c = tolower(*name++);
201 hash = partial_name_hash(c, hash);
203 qstr->hash = end_name_hash(hash);
209 * Case insensitive compare of two isofs names.
211 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
212 struct qstr *b, int ms)
216 /* A filename cannot end in '.' or we treat it like it has none */
220 while (alen && a->name[alen-1] == '.')
222 while (blen && b->name[blen-1] == '.')
226 if (strnicmp(a->name, b->name, alen) == 0)
233 * Case sensitive compare of two isofs names.
235 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
236 struct qstr *b, int ms)
240 /* A filename cannot end in '.' or we treat it like it has none */
244 while (alen && a->name[alen-1] == '.')
246 while (blen && b->name[blen-1] == '.')
250 if (strncmp(a->name, b->name, alen) == 0)
257 isofs_hash(struct dentry *dentry, struct qstr *qstr)
259 return isofs_hash_common(dentry, qstr, 0);
263 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
265 return isofs_hashi_common(dentry, qstr, 0);
269 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
271 return isofs_dentry_cmp_common(dentry, a, b, 0);
275 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
277 return isofs_dentry_cmpi_common(dentry, a, b, 0);
282 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
284 return isofs_hash_common(dentry, qstr, 1);
288 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
290 return isofs_hashi_common(dentry, qstr, 1);
294 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
296 return isofs_dentry_cmp_common(dentry, a, b, 1);
300 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
302 return isofs_dentry_cmpi_common(dentry, a, b, 1);
307 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
308 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
309 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
310 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode,
313 static match_table_t tokens = {
314 {Opt_norock, "norock"},
315 {Opt_nojoliet, "nojoliet"},
316 {Opt_unhide, "unhide"},
318 {Opt_showassoc, "showassoc"},
319 {Opt_cruft, "cruft"},
321 {Opt_iocharset, "iocharset=%s"},
322 {Opt_map_a, "map=acorn"},
323 {Opt_map_a, "map=a"},
324 {Opt_map_n, "map=normal"},
325 {Opt_map_n, "map=n"},
326 {Opt_map_o, "map=off"},
327 {Opt_map_o, "map=o"},
328 {Opt_session, "session=%u"},
329 {Opt_sb, "sbsector=%u"},
330 {Opt_check_r, "check=relaxed"},
331 {Opt_check_r, "check=r"},
332 {Opt_check_s, "check=strict"},
333 {Opt_check_s, "check=s"},
336 {Opt_mode, "mode=%u"},
337 {Opt_dmode, "dmode=%u"},
338 {Opt_block, "block=%u"},
339 {Opt_ignore, "conv=binary"},
340 {Opt_ignore, "conv=b"},
341 {Opt_ignore, "conv=text"},
342 {Opt_ignore, "conv=t"},
343 {Opt_ignore, "conv=mtext"},
344 {Opt_ignore, "conv=m"},
345 {Opt_ignore, "conv=auto"},
346 {Opt_ignore, "conv=a"},
347 {Opt_nocompress, "nocompress"},
351 static int parse_options(char *options, struct iso9660_options *popt)
361 popt->showassoc = 'n';
362 popt->check = 'u'; /* unset */
363 popt->nocompress = 0;
364 popt->blocksize = 1024;
365 popt->fmode = popt->dmode = S_IRUGO | S_IXUGO; /*
366 * r-x for all. The disc could
367 * be shared with DOS machines so
368 * virtually anything could be
369 * a valid executable.
373 popt->iocharset = NULL;
380 while ((p = strsep(&options, ",")) != NULL) {
382 substring_t args[MAX_OPT_ARGS];
388 token = match_token(p, tokens, args);
401 popt->showassoc = 'y';
411 popt->iocharset = match_strdup(&args[0]);
424 if (match_int(&args[0], &option))
429 popt->session = n + 1;
432 if (match_int(&args[0], &option))
434 popt->sbsector = option;
445 if (match_int(&args[0], &option))
450 if (match_int(&args[0], &option))
455 if (match_int(&args[0], &option))
457 popt->fmode = option;
460 if (match_int(&args[0], &option))
462 popt->dmode = option;
465 if (match_int(&args[0], &option))
468 if (n != 512 && n != 1024 && n != 2048)
473 popt->nocompress = 1;
483 * look if the driver can tell the multi session redirection value
485 * don't change this if you don't know what you do, please!
486 * Multisession is legal only with XA disks.
487 * A non-XA disk with more than one volume descriptor may do it right, but
488 * usually is written in a nowhere standardized "multi-partition" manner.
489 * Multisession uses absolute addressing (solely the first frame of the whole
490 * track is #0), multi-partition uses relative addressing (each first frame of
491 * each track is #0), and a track is not a session.
493 * A broken CDwriter software or drive firmware does not set new standards,
494 * at least not if conflicting with the existing ones.
498 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
500 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
502 struct cdrom_multisession ms_info;
503 unsigned int vol_desc_start;
504 struct block_device *bdev = sb->s_bdev;
508 ms_info.addr_format=CDROM_LBA;
509 if(session >= 0 && session <= 99) {
510 struct cdrom_tocentry Te;
511 Te.cdte_track=session;
512 Te.cdte_format=CDROM_LBA;
513 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
515 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
516 session, Te.cdte_addr.lba,
517 Te.cdte_ctrl&CDROM_DATA_TRACK);
518 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
519 return Te.cdte_addr.lba;
522 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
524 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
526 printk(KERN_ERR "ISOFS: Invalid session number\n");
528 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
530 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
531 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
535 #if WE_OBEY_THE_WRITTEN_STANDARDS
536 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
538 vol_desc_start=ms_info.addr.lba;
539 return vol_desc_start;
543 * Initialize the superblock and read the root inode.
545 * Note: a check_disk_change() has been done immediately prior
546 * to this call, so we don't need to check again.
548 static int isofs_fill_super(struct super_block *s, void *data, int silent)
550 struct buffer_head *bh = NULL, *pri_bh = NULL;
551 struct hs_primary_descriptor *h_pri = NULL;
552 struct iso_primary_descriptor *pri = NULL;
553 struct iso_supplementary_descriptor *sec = NULL;
554 struct iso_directory_record *rootp;
556 struct iso9660_options opt;
557 struct isofs_sb_info *sbi;
558 unsigned long first_data_zone;
559 int joliet_level = 0;
560 int iso_blknum, block;
562 int table, error = -EINVAL;
563 unsigned int vol_desc_start;
565 save_mount_options(s, data);
567 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
572 if (!parse_options((char *)data, &opt))
576 * First of all, get the hardware blocksize for this device.
577 * If we don't know what it is, or the hardware blocksize is
578 * larger than the blocksize the user specified, then use
582 * What if bugger tells us to go beyond page size?
584 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
586 sbi->s_high_sierra = 0; /* default is iso9660 */
588 vol_desc_start = (opt.sbsector != -1) ?
589 opt.sbsector : isofs_get_last_session(s,opt.session);
591 for (iso_blknum = vol_desc_start+16;
592 iso_blknum < vol_desc_start+100; iso_blknum++) {
593 struct hs_volume_descriptor *hdp;
594 struct iso_volume_descriptor *vdp;
596 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
597 if (!(bh = sb_bread(s, block)))
600 vdp = (struct iso_volume_descriptor *)bh->b_data;
601 hdp = (struct hs_volume_descriptor *)bh->b_data;
604 * Due to the overlapping physical location of the descriptors,
605 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
606 * proper identification in this case, we first check for ISO.
608 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
609 if (isonum_711(vdp->type) == ISO_VD_END)
611 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
613 pri = (struct iso_primary_descriptor *)vdp;
614 /* Save the buffer in case we need it ... */
620 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
621 sec = (struct iso_supplementary_descriptor *)vdp;
622 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
623 if (opt.joliet == 'y') {
624 if (sec->escape[2] == 0x40)
626 else if (sec->escape[2] == 0x43)
628 else if (sec->escape[2] == 0x45)
631 printk(KERN_DEBUG "ISO 9660 Extensions: "
632 "Microsoft Joliet Level %d\n",
637 /* Unknown supplementary volume descriptor */
643 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
644 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
647 sbi->s_high_sierra = 1;
649 h_pri = (struct hs_primary_descriptor *)vdp;
654 /* Just skip any volume descriptors we don't recognize */
660 * If we fall through, either no volume descriptor was found,
661 * or else we passed a primary descriptor looking for others.
664 goto out_unknown_format;
671 if (joliet_level && (pri == NULL || opt.rock == 'n')) {
672 /* This is the case of Joliet with the norock mount flag.
673 * A disc with both Joliet and Rock Ridge is handled later
675 pri = (struct iso_primary_descriptor *) sec;
678 if(sbi->s_high_sierra){
679 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
680 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
681 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
682 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
686 rootp = (struct iso_directory_record *) pri->root_directory_record;
687 sbi->s_nzones = isonum_733(pri->volume_space_size);
688 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
689 sbi->s_max_size = isonum_733(pri->volume_space_size);
692 sbi->s_ninodes = 0; /* No way to figure this out easily */
694 orig_zonesize = sbi->s_log_zone_size;
696 * If the zone size is smaller than the hardware sector size,
697 * this is a fatal error. This would occur if the disc drive
698 * had sectors that were 2048 bytes, but the filesystem had
699 * blocks that were 512 bytes (which should only very rarely
702 if (orig_zonesize < opt.blocksize)
705 /* RDE: convert log zone size to bit shift */
706 switch (sbi->s_log_zone_size) {
707 case 512: sbi->s_log_zone_size = 9; break;
708 case 1024: sbi->s_log_zone_size = 10; break;
709 case 2048: sbi->s_log_zone_size = 11; break;
712 goto out_bad_zone_size;
715 s->s_magic = ISOFS_SUPER_MAGIC;
716 s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
719 * The CDROM is read-only, has no nodes (devices) on it, and since
720 * all of the files appear to be owned by root, we really do not want
721 * to allow suid. (suid or devices will not show up unless we have
722 * Rock Ridge extensions)
725 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
727 /* Set this for reference. Its not currently used except on write
728 which we don't have .. */
730 first_data_zone = isonum_733(rootp->extent) +
731 isonum_711(rootp->ext_attr_length);
732 sbi->s_firstdatazone = first_data_zone;
734 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
735 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
736 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
737 if(sbi->s_high_sierra)
738 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
742 * If the Joliet level is set, we _may_ decide to use the
743 * secondary descriptor, but can't be sure until after we
744 * read the root inode. But before reading the root inode
745 * we may need to change the device blocksize, and would
746 * rather release the old buffer first. So, we cache the
747 * first_data_zone value from the secondary descriptor.
750 pri = (struct iso_primary_descriptor *) sec;
751 rootp = (struct iso_directory_record *)
752 pri->root_directory_record;
753 first_data_zone = isonum_733(rootp->extent) +
754 isonum_711(rootp->ext_attr_length);
758 * We're all done using the volume descriptor, and may need
759 * to change the device blocksize, so release the buffer now.
765 * Force the blocksize to 512 for 512 byte sectors. The file
766 * read primitives really get it wrong in a bad way if we don't
769 * Note - we should never be setting the blocksize to something
770 * less than the hardware sector size for the device. If we
771 * do, we would end up having to read larger buffers and split
772 * out portions to satisfy requests.
774 * Note2- the idea here is that we want to deal with the optimal
775 * zonesize in the filesystem. If we have it set to something less,
776 * then we have horrible problems with trying to piece together
777 * bits of adjacent blocks in order to properly read directory
778 * entries. By forcing the blocksize in this way, we ensure
779 * that we will never be required to do this.
781 sb_set_blocksize(s, orig_zonesize);
783 sbi->s_nls_iocharset = NULL;
786 if (joliet_level && opt.utf8 == 0) {
787 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
788 sbi->s_nls_iocharset = load_nls(p);
789 if (! sbi->s_nls_iocharset) {
790 /* Fail only if explicit charset specified */
793 sbi->s_nls_iocharset = load_nls_default();
797 s->s_op = &isofs_sops;
798 s->s_export_op = &isofs_export_ops;
799 sbi->s_mapping = opt.map;
800 sbi->s_rock = (opt.rock == 'y' ? 2 : 0);
801 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
802 sbi->s_cruft = opt.cruft;
803 sbi->s_hide = opt.hide;
804 sbi->s_showassoc = opt.showassoc;
805 sbi->s_uid = opt.uid;
806 sbi->s_gid = opt.gid;
807 sbi->s_utf8 = opt.utf8;
808 sbi->s_nocompress = opt.nocompress;
810 * It would be incredibly stupid to allow people to mark every file
811 * on the disk as suid, so we merely allow them to set the default
814 sbi->s_fmode = opt.fmode & 0777;
815 sbi->s_dmode = opt.dmode & 0777;
818 * Read the root inode, which _may_ result in changing
819 * the s_rock flag. Once we have the final s_rock value,
820 * we then decide whether to use the Joliet descriptor.
822 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
827 * If this disk has both Rock Ridge and Joliet on it, then we
828 * want to use Rock Ridge by default. This can be overridden
829 * by using the norock mount option. There is still one other
830 * possibility that is not taken into account: a Rock Ridge
831 * CD with Unicode names. Until someone sees such a beast, it
832 * will not be supported.
834 if (sbi->s_rock == 1) {
836 } else if (joliet_level) {
838 if (sbi->s_firstdatazone != first_data_zone) {
839 sbi->s_firstdatazone = first_data_zone;
841 "ISOFS: changing to secondary root\n");
843 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
849 if (opt.check == 'u') {
850 /* Only Joliet is case insensitive by default */
856 sbi->s_joliet_level = joliet_level;
858 /* check the root inode */
862 /* Make sure the root inode is a directory */
863 if (!S_ISDIR(inode->i_mode)) {
865 "isofs_fill_super: root inode is not a directory. "
866 "Corrupted media?\n");
870 /* get the root dentry */
871 s->s_root = d_alloc_root(inode);
878 if (opt.check == 'r')
880 s->s_root->d_op = &isofs_dentry_ops[table];
882 kfree(opt.iocharset);
887 * Display error messages and free resources.
890 printk(KERN_WARNING "%s: root inode not initialized\n", __func__);
895 error = PTR_ERR(inode);
896 if (error != -ENOMEM)
897 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
900 if (sbi->s_nls_iocharset)
901 unload_nls(sbi->s_nls_iocharset);
905 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
906 __func__, s->s_id, iso_blknum, block);
909 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
910 sbi->s_log_zone_size);
913 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
914 orig_zonesize, opt.blocksize);
918 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
923 kfree(opt.iocharset);
929 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
931 struct super_block *sb = dentry->d_sb;
933 buf->f_type = ISOFS_SUPER_MAGIC;
934 buf->f_bsize = sb->s_blocksize;
935 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
936 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
939 buf->f_files = ISOFS_SB(sb)->s_ninodes;
941 buf->f_namelen = NAME_MAX;
946 * Get a set of blocks; filling in buffer_heads if already allocated
947 * or getblk() if they are not. Returns the number of blocks inserted
950 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
951 struct buffer_head **bh, unsigned long nblocks)
954 unsigned offset, sect_size;
955 unsigned int firstext;
956 unsigned long nextblk, nextoff;
957 long iblock = (long)iblock_s;
958 int section, rv, error;
959 struct iso_inode_info *ei = ISOFS_I(inode);
965 if (iblock < 0 || iblock != iblock_s) {
966 printk(KERN_DEBUG "%s: block number too large\n", __func__);
973 firstext = ei->i_first_extent;
974 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
975 nextblk = ei->i_next_section_block;
976 nextoff = ei->i_next_section_offset;
980 /* If we are *way* beyond the end of the file, print a message.
981 * Access beyond the end of the file up to the next page boundary
982 * is normal, however because of the way the page cache works.
983 * In this case, we just return 0 so that we can properly fill
984 * the page with useless information without generating any
987 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
988 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
989 __func__, iblock, (unsigned long) inode->i_size);
993 /* On the last section, nextblk == 0, section size is likely to
994 * exceed sect_size by a partial block, and access beyond the
995 * end of the file will reach beyond the section size, too.
997 while (nextblk && (b_off >= (offset + sect_size))) {
998 struct inode *ninode;
1000 offset += sect_size;
1001 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1002 if (IS_ERR(ninode)) {
1003 error = PTR_ERR(ninode);
1006 firstext = ISOFS_I(ninode)->i_first_extent;
1007 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1008 nextblk = ISOFS_I(ninode)->i_next_section_block;
1009 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1012 if (++section > 100) {
1013 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1014 " aborting...\n", __func__);
1015 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1016 "nextblk=%lu nextoff=%lu\n", __func__,
1017 iblock, firstext, (unsigned) sect_size,
1024 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1026 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1030 bh++; /* Next buffer head */
1031 b_off++; /* Next buffer offset */
1039 return rv != 0 ? rv : error;
1043 * Used by the standard interfaces.
1045 static int isofs_get_block(struct inode *inode, sector_t iblock,
1046 struct buffer_head *bh_result, int create)
1051 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1055 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1056 return ret < 0 ? ret : 0;
1059 static int isofs_bmap(struct inode *inode, sector_t block)
1061 struct buffer_head dummy;
1065 dummy.b_blocknr = -1000;
1066 error = isofs_get_block(inode, block, &dummy, 0);
1068 return dummy.b_blocknr;
1072 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1074 sector_t blknr = isofs_bmap(inode, block);
1077 return sb_bread(inode->i_sb, blknr);
1080 static int isofs_readpage(struct file *file, struct page *page)
1082 return block_read_full_page(page,isofs_get_block);
1085 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1087 return generic_block_bmap(mapping,block,isofs_get_block);
1090 static const struct address_space_operations isofs_aops = {
1091 .readpage = isofs_readpage,
1092 .sync_page = block_sync_page,
1096 static inline void test_and_set_uid(uid_t *p, uid_t value)
1102 static inline void test_and_set_gid(gid_t *p, gid_t value)
1108 static int isofs_read_level3_size(struct inode *inode)
1110 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1111 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1112 struct buffer_head *bh = NULL;
1113 unsigned long block, offset, block_saved, offset_saved;
1115 int more_entries = 0;
1116 struct iso_directory_record *tmpde = NULL;
1117 struct iso_inode_info *ei = ISOFS_I(inode);
1121 /* The first 16 blocks are reserved as the System Area. Thus,
1122 * no inodes can appear in block 0. We use this to flag that
1123 * this is the last section. */
1124 ei->i_next_section_block = 0;
1125 ei->i_next_section_offset = 0;
1127 block = ei->i_iget5_block;
1128 offset = ei->i_iget5_offset;
1131 struct iso_directory_record *de;
1132 unsigned int de_len;
1135 bh = sb_bread(inode->i_sb, block);
1139 de = (struct iso_directory_record *) (bh->b_data + offset);
1140 de_len = *(unsigned char *) de;
1150 block_saved = block;
1151 offset_saved = offset;
1154 /* Make sure we have a full directory entry */
1155 if (offset >= bufsize) {
1156 int slop = bufsize - offset + de_len;
1158 tmpde = kmalloc(256, GFP_KERNEL);
1162 memcpy(tmpde, de, slop);
1163 offset &= bufsize - 1;
1168 bh = sb_bread(inode->i_sb, block);
1171 memcpy((void *)tmpde+slop, bh->b_data, offset);
1176 inode->i_size += isonum_733(de->size);
1178 ei->i_next_section_block = block_saved;
1179 ei->i_next_section_offset = offset_saved;
1182 more_entries = de->flags[-high_sierra] & 0x80;
1187 } while (more_entries);
1200 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1205 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1206 "isofs_read_level3_size: inode=%lu\n",
1207 __func__, inode->i_ino);
1211 static int isofs_read_inode(struct inode *inode)
1213 struct super_block *sb = inode->i_sb;
1214 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1215 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1216 unsigned long block;
1217 int high_sierra = sbi->s_high_sierra;
1218 struct buffer_head *bh = NULL;
1219 struct iso_directory_record *de;
1220 struct iso_directory_record *tmpde = NULL;
1221 unsigned int de_len;
1222 unsigned long offset;
1223 struct iso_inode_info *ei = ISOFS_I(inode);
1226 block = ei->i_iget5_block;
1227 bh = sb_bread(inode->i_sb, block);
1231 offset = ei->i_iget5_offset;
1233 de = (struct iso_directory_record *) (bh->b_data + offset);
1234 de_len = *(unsigned char *) de;
1236 if (offset + de_len > bufsize) {
1237 int frag1 = bufsize - offset;
1239 tmpde = kmalloc(de_len, GFP_KERNEL);
1240 if (tmpde == NULL) {
1241 printk(KERN_INFO "%s: out of memory\n", __func__);
1245 memcpy(tmpde, bh->b_data + offset, frag1);
1247 bh = sb_bread(inode->i_sb, ++block);
1250 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1254 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1256 ISOFS_BUFFER_BITS(inode));
1258 /* Assume it is a normal-format file unless told otherwise */
1259 ei->i_file_format = isofs_file_normal;
1261 if (de->flags[-high_sierra] & 2) {
1262 inode->i_mode = sbi->s_dmode | S_IFDIR;
1263 inode->i_nlink = 1; /*
1264 * Set to 1. We know there are 2, but
1265 * the find utility tries to optimize
1266 * if it is 2, and it screws up. It is
1267 * easier to give 1 which tells find to
1268 * do it the hard way.
1271 /* Everybody gets to read the file. */
1272 inode->i_mode = sbi->s_fmode | S_IFREG;
1275 inode->i_uid = sbi->s_uid;
1276 inode->i_gid = sbi->s_gid;
1277 inode->i_blocks = 0;
1279 ei->i_format_parm[0] = 0;
1280 ei->i_format_parm[1] = 0;
1281 ei->i_format_parm[2] = 0;
1283 ei->i_section_size = isonum_733(de->size);
1284 if (de->flags[-high_sierra] & 0x80) {
1285 ret = isofs_read_level3_size(inode);
1290 ei->i_next_section_block = 0;
1291 ei->i_next_section_offset = 0;
1292 inode->i_size = isonum_733(de->size);
1296 * Some dipshit decided to store some other bit of information
1297 * in the high byte of the file length. Truncate size in case
1298 * this CDROM was mounted with the cruft option.
1301 if (sbi->s_cruft == 'y')
1302 inode->i_size &= 0x00ffffff;
1304 if (de->interleave[0]) {
1305 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1309 /* I have no idea what file_unit_size is used for, so
1310 we will flag it for now */
1311 if (de->file_unit_size[0] != 0) {
1312 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1316 /* I have no idea what other flag bits are used for, so
1317 we will flag it for now */
1319 if((de->flags[-high_sierra] & ~2)!= 0){
1320 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1322 inode->i_ino, de->flags[-high_sierra]);
1326 inode->i_mtime.tv_sec =
1327 inode->i_atime.tv_sec =
1328 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1329 inode->i_mtime.tv_nsec =
1330 inode->i_atime.tv_nsec =
1331 inode->i_ctime.tv_nsec = 0;
1333 ei->i_first_extent = (isonum_733(de->extent) +
1334 isonum_711(de->ext_attr_length));
1336 /* Set the number of blocks for stat() - should be done before RR */
1337 inode->i_blocks = (inode->i_size + 511) >> 9;
1340 * Now test for possible Rock Ridge extensions which will override
1341 * some of these numbers in the inode structure.
1345 parse_rock_ridge_inode(de, inode);
1346 /* if we want uid/gid set, override the rock ridge setting */
1347 test_and_set_uid(&inode->i_uid, sbi->s_uid);
1348 test_and_set_gid(&inode->i_gid, sbi->s_gid);
1351 /* Install the inode operations vector */
1352 if (S_ISREG(inode->i_mode)) {
1353 inode->i_fop = &generic_ro_fops;
1354 switch (ei->i_file_format) {
1355 #ifdef CONFIG_ZISOFS
1356 case isofs_file_compressed:
1357 inode->i_data.a_ops = &zisofs_aops;
1361 inode->i_data.a_ops = &isofs_aops;
1364 } else if (S_ISDIR(inode->i_mode)) {
1365 inode->i_op = &isofs_dir_inode_operations;
1366 inode->i_fop = &isofs_dir_operations;
1367 } else if (S_ISLNK(inode->i_mode)) {
1368 inode->i_op = &page_symlink_inode_operations;
1369 inode->i_data.a_ops = &isofs_symlink_aops;
1371 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1372 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1382 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1387 struct isofs_iget5_callback_data {
1388 unsigned long block;
1389 unsigned long offset;
1392 static int isofs_iget5_test(struct inode *ino, void *data)
1394 struct iso_inode_info *i = ISOFS_I(ino);
1395 struct isofs_iget5_callback_data *d =
1396 (struct isofs_iget5_callback_data*)data;
1397 return (i->i_iget5_block == d->block)
1398 && (i->i_iget5_offset == d->offset);
1401 static int isofs_iget5_set(struct inode *ino, void *data)
1403 struct iso_inode_info *i = ISOFS_I(ino);
1404 struct isofs_iget5_callback_data *d =
1405 (struct isofs_iget5_callback_data*)data;
1406 i->i_iget5_block = d->block;
1407 i->i_iget5_offset = d->offset;
1411 /* Store, in the inode's containing structure, the block and block
1412 * offset that point to the underlying meta-data for the inode. The
1413 * code below is otherwise similar to the iget() code in
1414 * include/linux/fs.h */
1415 struct inode *isofs_iget(struct super_block *sb,
1416 unsigned long block,
1417 unsigned long offset)
1419 unsigned long hashval;
1420 struct inode *inode;
1421 struct isofs_iget5_callback_data data;
1424 if (offset >= 1ul << sb->s_blocksize_bits)
1425 return ERR_PTR(-EINVAL);
1428 data.offset = offset;
1430 hashval = (block << sb->s_blocksize_bits) | offset;
1432 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1433 &isofs_iget5_set, &data);
1436 return ERR_PTR(-ENOMEM);
1438 if (inode->i_state & I_NEW) {
1439 ret = isofs_read_inode(inode);
1442 inode = ERR_PTR(ret);
1444 unlock_new_inode(inode);
1451 static int isofs_get_sb(struct file_system_type *fs_type,
1452 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1454 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1458 static struct file_system_type iso9660_fs_type = {
1459 .owner = THIS_MODULE,
1461 .get_sb = isofs_get_sb,
1462 .kill_sb = kill_block_super,
1463 .fs_flags = FS_REQUIRES_DEV,
1466 static int __init init_iso9660_fs(void)
1468 int err = init_inodecache();
1471 #ifdef CONFIG_ZISOFS
1472 err = zisofs_init();
1476 err = register_filesystem(&iso9660_fs_type);
1481 #ifdef CONFIG_ZISOFS
1485 destroy_inodecache();
1490 static void __exit exit_iso9660_fs(void)
1492 unregister_filesystem(&iso9660_fs_type);
1493 #ifdef CONFIG_ZISOFS
1496 destroy_inodecache();
1499 module_init(init_iso9660_fs)
1500 module_exit(exit_iso9660_fs)
1501 MODULE_LICENSE("GPL");
1502 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1503 MODULE_ALIAS("iso9660");