2 * linux/fs/isofs/inode.c
4 * (C) 1991 Linus Torvalds - minix filesystem
5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
6 * 1994 Eberhard Mönkeberg - multi session handling.
7 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
8 * 1997 Gordon Chaffee - Joliet CDs
9 * 1998 Eric Lammerts - ISO 9660 Level 3
10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
11 * 2004 Paul Serice - NFS Export Operations
14 #include <linux/init.h>
15 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/nls.h>
19 #include <linux/ctype.h>
20 #include <linux/statfs.h>
21 #include <linux/cdrom.h>
22 #include <linux/parser.h>
23 #include <linux/mpage.h>
30 static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
32 static int isofs_hash(const struct dentry *parent, const struct inode *inode,
34 static int isofs_dentry_cmpi(const struct dentry *parent,
35 const struct inode *pinode,
36 const struct dentry *dentry, const struct inode *inode,
37 unsigned int len, const char *str, const struct qstr *name);
38 static int isofs_dentry_cmp(const struct dentry *parent,
39 const struct inode *pinode,
40 const struct dentry *dentry, const struct inode *inode,
41 unsigned int len, const char *str, const struct qstr *name);
44 static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
46 static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
48 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
49 const struct inode *pinode,
50 const struct dentry *dentry, const struct inode *inode,
51 unsigned int len, const char *str, const struct qstr *name);
52 static int isofs_dentry_cmp_ms(const struct dentry *parent,
53 const struct inode *pinode,
54 const struct dentry *dentry, const struct inode *inode,
55 unsigned int len, const char *str, const struct qstr *name);
58 static void isofs_put_super(struct super_block *sb)
60 struct isofs_sb_info *sbi = ISOFS_SB(sb);
63 unload_nls(sbi->s_nls_iocharset);
71 static int isofs_read_inode(struct inode *, int relocated);
72 static int isofs_statfs (struct dentry *, struct kstatfs *);
74 static struct kmem_cache *isofs_inode_cachep;
76 static struct inode *isofs_alloc_inode(struct super_block *sb)
78 struct iso_inode_info *ei;
79 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
82 return &ei->vfs_inode;
85 static void isofs_i_callback(struct rcu_head *head)
87 struct inode *inode = container_of(head, struct inode, i_rcu);
88 INIT_LIST_HEAD(&inode->i_dentry);
89 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
92 static void isofs_destroy_inode(struct inode *inode)
94 call_rcu(&inode->i_rcu, isofs_i_callback);
97 static void init_once(void *foo)
99 struct iso_inode_info *ei = foo;
101 inode_init_once(&ei->vfs_inode);
104 static int init_inodecache(void)
106 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
107 sizeof(struct iso_inode_info),
108 0, (SLAB_RECLAIM_ACCOUNT|
111 if (isofs_inode_cachep == NULL)
116 static void destroy_inodecache(void)
118 kmem_cache_destroy(isofs_inode_cachep);
121 static int isofs_remount(struct super_block *sb, int *flags, char *data)
123 if (!(*flags & MS_RDONLY))
128 static const struct super_operations isofs_sops = {
129 .alloc_inode = isofs_alloc_inode,
130 .destroy_inode = isofs_destroy_inode,
131 .put_super = isofs_put_super,
132 .statfs = isofs_statfs,
133 .remount_fs = isofs_remount,
134 .show_options = generic_show_options,
138 static const struct dentry_operations isofs_dentry_ops[] = {
140 .d_hash = isofs_hash,
141 .d_compare = isofs_dentry_cmp,
144 .d_hash = isofs_hashi,
145 .d_compare = isofs_dentry_cmpi,
149 .d_hash = isofs_hash_ms,
150 .d_compare = isofs_dentry_cmp_ms,
153 .d_hash = isofs_hashi_ms,
154 .d_compare = isofs_dentry_cmpi_ms,
159 struct iso9660_options{
161 unsigned int joliet:1;
162 unsigned int cruft:1;
164 unsigned int showassoc:1;
165 unsigned int nocompress:1;
166 unsigned int overriderockperm:1;
167 unsigned int uid_set:1;
168 unsigned int gid_set:1;
172 unsigned int blocksize;
184 * Compute the hash for the isofs name corresponding to the dentry.
187 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
195 while (len && name[len-1] == '.')
199 qstr->hash = full_name_hash(name, len);
205 * Compute the hash for the isofs name corresponding to the dentry.
208 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
218 while (len && name[len-1] == '.')
222 hash = init_name_hash();
224 c = tolower(*name++);
225 hash = partial_name_hash(c, hash);
227 qstr->hash = end_name_hash(hash);
233 * Compare of two isofs names.
235 static int isofs_dentry_cmp_common(
236 unsigned int len, const char *str,
237 const struct qstr *name, int ms, int ci)
241 /* A filename cannot end in '.' or we treat it like it has none */
245 while (alen && name->name[alen-1] == '.')
247 while (blen && str[blen-1] == '.')
252 if (strnicmp(name->name, str, alen) == 0)
255 if (strncmp(name->name, str, alen) == 0)
263 isofs_hash(const struct dentry *dentry, const struct inode *inode,
266 return isofs_hash_common(dentry, qstr, 0);
270 isofs_hashi(const struct dentry *dentry, const struct inode *inode,
273 return isofs_hashi_common(dentry, qstr, 0);
277 isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
278 const struct dentry *dentry, const struct inode *inode,
279 unsigned int len, const char *str, const struct qstr *name)
281 return isofs_dentry_cmp_common(len, str, name, 0, 0);
285 isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
286 const struct dentry *dentry, const struct inode *inode,
287 unsigned int len, const char *str, const struct qstr *name)
289 return isofs_dentry_cmp_common(len, str, name, 0, 1);
294 isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
297 return isofs_hash_common(dentry, qstr, 1);
301 isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
304 return isofs_hashi_common(dentry, qstr, 1);
308 isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
309 const struct dentry *dentry, const struct inode *inode,
310 unsigned int len, const char *str, const struct qstr *name)
312 return isofs_dentry_cmp_common(len, str, name, 1, 0);
316 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
317 const struct dentry *dentry, const struct inode *inode,
318 unsigned int len, const char *str, const struct qstr *name)
320 return isofs_dentry_cmp_common(len, str, name, 1, 1);
325 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
326 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
327 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
328 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
331 static const match_table_t tokens = {
332 {Opt_norock, "norock"},
333 {Opt_nojoliet, "nojoliet"},
334 {Opt_unhide, "unhide"},
336 {Opt_showassoc, "showassoc"},
337 {Opt_cruft, "cruft"},
339 {Opt_iocharset, "iocharset=%s"},
340 {Opt_map_a, "map=acorn"},
341 {Opt_map_a, "map=a"},
342 {Opt_map_n, "map=normal"},
343 {Opt_map_n, "map=n"},
344 {Opt_map_o, "map=off"},
345 {Opt_map_o, "map=o"},
346 {Opt_session, "session=%u"},
347 {Opt_sb, "sbsector=%u"},
348 {Opt_check_r, "check=relaxed"},
349 {Opt_check_r, "check=r"},
350 {Opt_check_s, "check=strict"},
351 {Opt_check_s, "check=s"},
354 {Opt_mode, "mode=%u"},
355 {Opt_dmode, "dmode=%u"},
356 {Opt_overriderockperm, "overriderockperm"},
357 {Opt_block, "block=%u"},
358 {Opt_ignore, "conv=binary"},
359 {Opt_ignore, "conv=b"},
360 {Opt_ignore, "conv=text"},
361 {Opt_ignore, "conv=t"},
362 {Opt_ignore, "conv=mtext"},
363 {Opt_ignore, "conv=m"},
364 {Opt_ignore, "conv=auto"},
365 {Opt_ignore, "conv=a"},
366 {Opt_nocompress, "nocompress"},
370 static int parse_options(char *options, struct iso9660_options *popt)
381 popt->check = 'u'; /* unset */
382 popt->nocompress = 0;
383 popt->blocksize = 1024;
384 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
389 popt->iocharset = NULL;
391 popt->overriderockperm = 0;
397 while ((p = strsep(&options, ",")) != NULL) {
399 substring_t args[MAX_OPT_ARGS];
405 token = match_token(p, tokens, args);
428 popt->iocharset = match_strdup(&args[0]);
441 if (match_int(&args[0], &option))
446 popt->session = n + 1;
449 if (match_int(&args[0], &option))
451 popt->sbsector = option;
462 if (match_int(&args[0], &option))
468 if (match_int(&args[0], &option))
474 if (match_int(&args[0], &option))
476 popt->fmode = option;
479 if (match_int(&args[0], &option))
481 popt->dmode = option;
483 case Opt_overriderockperm:
484 popt->overriderockperm = 1;
487 if (match_int(&args[0], &option))
490 if (n != 512 && n != 1024 && n != 2048)
495 popt->nocompress = 1;
505 * look if the driver can tell the multi session redirection value
507 * don't change this if you don't know what you do, please!
508 * Multisession is legal only with XA disks.
509 * A non-XA disk with more than one volume descriptor may do it right, but
510 * usually is written in a nowhere standardized "multi-partition" manner.
511 * Multisession uses absolute addressing (solely the first frame of the whole
512 * track is #0), multi-partition uses relative addressing (each first frame of
513 * each track is #0), and a track is not a session.
515 * A broken CDwriter software or drive firmware does not set new standards,
516 * at least not if conflicting with the existing ones.
520 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
522 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
524 struct cdrom_multisession ms_info;
525 unsigned int vol_desc_start;
526 struct block_device *bdev = sb->s_bdev;
530 ms_info.addr_format=CDROM_LBA;
531 if(session >= 0 && session <= 99) {
532 struct cdrom_tocentry Te;
533 Te.cdte_track=session;
534 Te.cdte_format=CDROM_LBA;
535 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
537 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
538 session, Te.cdte_addr.lba,
539 Te.cdte_ctrl&CDROM_DATA_TRACK);
540 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
541 return Te.cdte_addr.lba;
544 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
546 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
548 printk(KERN_ERR "ISOFS: Invalid session number\n");
550 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
552 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
553 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
557 #if WE_OBEY_THE_WRITTEN_STANDARDS
558 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
560 vol_desc_start=ms_info.addr.lba;
561 return vol_desc_start;
565 * Check if root directory is empty (has less than 3 files).
567 * Used to detect broken CDs where ISO root directory is empty but Joliet root
568 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
569 * (and Joliet used instead) or else no files would be visible.
571 static bool rootdir_empty(struct super_block *sb, unsigned long block)
573 int offset = 0, files = 0, de_len;
574 struct iso_directory_record *de;
575 struct buffer_head *bh;
577 bh = sb_bread(sb, block);
581 de = (struct iso_directory_record *) (bh->b_data + offset);
582 de_len = *(unsigned char *) de;
593 * Initialize the superblock and read the root inode.
595 * Note: a check_disk_change() has been done immediately prior
596 * to this call, so we don't need to check again.
598 static int isofs_fill_super(struct super_block *s, void *data, int silent)
600 struct buffer_head *bh = NULL, *pri_bh = NULL;
601 struct hs_primary_descriptor *h_pri = NULL;
602 struct iso_primary_descriptor *pri = NULL;
603 struct iso_supplementary_descriptor *sec = NULL;
604 struct iso_directory_record *rootp;
606 struct iso9660_options opt;
607 struct isofs_sb_info *sbi;
608 unsigned long first_data_zone;
609 int joliet_level = 0;
610 int iso_blknum, block;
612 int table, error = -EINVAL;
613 unsigned int vol_desc_start;
615 save_mount_options(s, data);
617 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
622 if (!parse_options((char *)data, &opt))
626 * First of all, get the hardware blocksize for this device.
627 * If we don't know what it is, or the hardware blocksize is
628 * larger than the blocksize the user specified, then use
632 * What if bugger tells us to go beyond page size?
634 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
636 sbi->s_high_sierra = 0; /* default is iso9660 */
638 vol_desc_start = (opt.sbsector != -1) ?
639 opt.sbsector : isofs_get_last_session(s,opt.session);
641 for (iso_blknum = vol_desc_start+16;
642 iso_blknum < vol_desc_start+100; iso_blknum++) {
643 struct hs_volume_descriptor *hdp;
644 struct iso_volume_descriptor *vdp;
646 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
647 if (!(bh = sb_bread(s, block)))
650 vdp = (struct iso_volume_descriptor *)bh->b_data;
651 hdp = (struct hs_volume_descriptor *)bh->b_data;
654 * Due to the overlapping physical location of the descriptors,
655 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
656 * proper identification in this case, we first check for ISO.
658 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
659 if (isonum_711(vdp->type) == ISO_VD_END)
661 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
663 pri = (struct iso_primary_descriptor *)vdp;
664 /* Save the buffer in case we need it ... */
670 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
671 sec = (struct iso_supplementary_descriptor *)vdp;
672 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
674 if (sec->escape[2] == 0x40)
676 else if (sec->escape[2] == 0x43)
678 else if (sec->escape[2] == 0x45)
681 printk(KERN_DEBUG "ISO 9660 Extensions: "
682 "Microsoft Joliet Level %d\n",
687 /* Unknown supplementary volume descriptor */
693 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
694 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
697 sbi->s_high_sierra = 1;
699 h_pri = (struct hs_primary_descriptor *)vdp;
704 /* Just skip any volume descriptors we don't recognize */
710 * If we fall through, either no volume descriptor was found,
711 * or else we passed a primary descriptor looking for others.
714 goto out_unknown_format;
721 if (joliet_level && (pri == NULL || !opt.rock)) {
722 /* This is the case of Joliet with the norock mount flag.
723 * A disc with both Joliet and Rock Ridge is handled later
725 pri = (struct iso_primary_descriptor *) sec;
728 if(sbi->s_high_sierra){
729 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
730 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
731 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
732 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
736 rootp = (struct iso_directory_record *) pri->root_directory_record;
737 sbi->s_nzones = isonum_733(pri->volume_space_size);
738 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
739 sbi->s_max_size = isonum_733(pri->volume_space_size);
742 sbi->s_ninodes = 0; /* No way to figure this out easily */
744 orig_zonesize = sbi->s_log_zone_size;
746 * If the zone size is smaller than the hardware sector size,
747 * this is a fatal error. This would occur if the disc drive
748 * had sectors that were 2048 bytes, but the filesystem had
749 * blocks that were 512 bytes (which should only very rarely
752 if (orig_zonesize < opt.blocksize)
755 /* RDE: convert log zone size to bit shift */
756 switch (sbi->s_log_zone_size) {
757 case 512: sbi->s_log_zone_size = 9; break;
758 case 1024: sbi->s_log_zone_size = 10; break;
759 case 2048: sbi->s_log_zone_size = 11; break;
762 goto out_bad_zone_size;
765 s->s_magic = ISOFS_SUPER_MAGIC;
768 * With multi-extent files, file size is only limited by the maximum
769 * size of a file system, which is 8 TB.
771 s->s_maxbytes = 0x80000000000LL;
773 /* Set this for reference. Its not currently used except on write
774 which we don't have .. */
776 first_data_zone = isonum_733(rootp->extent) +
777 isonum_711(rootp->ext_attr_length);
778 sbi->s_firstdatazone = first_data_zone;
780 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
781 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
782 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
783 if(sbi->s_high_sierra)
784 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
788 * If the Joliet level is set, we _may_ decide to use the
789 * secondary descriptor, but can't be sure until after we
790 * read the root inode. But before reading the root inode
791 * we may need to change the device blocksize, and would
792 * rather release the old buffer first. So, we cache the
793 * first_data_zone value from the secondary descriptor.
796 pri = (struct iso_primary_descriptor *) sec;
797 rootp = (struct iso_directory_record *)
798 pri->root_directory_record;
799 first_data_zone = isonum_733(rootp->extent) +
800 isonum_711(rootp->ext_attr_length);
804 * We're all done using the volume descriptor, and may need
805 * to change the device blocksize, so release the buffer now.
811 * Force the blocksize to 512 for 512 byte sectors. The file
812 * read primitives really get it wrong in a bad way if we don't
815 * Note - we should never be setting the blocksize to something
816 * less than the hardware sector size for the device. If we
817 * do, we would end up having to read larger buffers and split
818 * out portions to satisfy requests.
820 * Note2- the idea here is that we want to deal with the optimal
821 * zonesize in the filesystem. If we have it set to something less,
822 * then we have horrible problems with trying to piece together
823 * bits of adjacent blocks in order to properly read directory
824 * entries. By forcing the blocksize in this way, we ensure
825 * that we will never be required to do this.
827 sb_set_blocksize(s, orig_zonesize);
829 sbi->s_nls_iocharset = NULL;
832 if (joliet_level && opt.utf8 == 0) {
833 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
834 sbi->s_nls_iocharset = load_nls(p);
835 if (! sbi->s_nls_iocharset) {
836 /* Fail only if explicit charset specified */
839 sbi->s_nls_iocharset = load_nls_default();
843 s->s_op = &isofs_sops;
844 s->s_export_op = &isofs_export_ops;
845 sbi->s_mapping = opt.map;
846 sbi->s_rock = (opt.rock ? 2 : 0);
847 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
848 sbi->s_cruft = opt.cruft;
849 sbi->s_hide = opt.hide;
850 sbi->s_showassoc = opt.showassoc;
851 sbi->s_uid = opt.uid;
852 sbi->s_gid = opt.gid;
853 sbi->s_uid_set = opt.uid_set;
854 sbi->s_gid_set = opt.gid_set;
855 sbi->s_utf8 = opt.utf8;
856 sbi->s_nocompress = opt.nocompress;
857 sbi->s_overriderockperm = opt.overriderockperm;
859 * It would be incredibly stupid to allow people to mark every file
860 * on the disk as suid, so we merely allow them to set the default
863 if (opt.fmode != ISOFS_INVALID_MODE)
864 sbi->s_fmode = opt.fmode & 0777;
866 sbi->s_fmode = ISOFS_INVALID_MODE;
867 if (opt.dmode != ISOFS_INVALID_MODE)
868 sbi->s_dmode = opt.dmode & 0777;
870 sbi->s_dmode = ISOFS_INVALID_MODE;
873 * Read the root inode, which _may_ result in changing
874 * the s_rock flag. Once we have the final s_rock value,
875 * we then decide whether to use the Joliet descriptor.
877 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
882 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
883 * correct Joliet root directory.
885 if (sbi->s_rock == 1 && joliet_level &&
886 rootdir_empty(s, sbi->s_firstdatazone)) {
888 "ISOFS: primary root directory is empty. "
889 "Disabling Rock Ridge and switching to Joliet.");
894 * If this disk has both Rock Ridge and Joliet on it, then we
895 * want to use Rock Ridge by default. This can be overridden
896 * by using the norock mount option. There is still one other
897 * possibility that is not taken into account: a Rock Ridge
898 * CD with Unicode names. Until someone sees such a beast, it
899 * will not be supported.
901 if (sbi->s_rock == 1) {
903 } else if (joliet_level) {
905 if (sbi->s_firstdatazone != first_data_zone) {
906 sbi->s_firstdatazone = first_data_zone;
908 "ISOFS: changing to secondary root\n");
910 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
916 if (opt.check == 'u') {
917 /* Only Joliet is case insensitive by default */
923 sbi->s_joliet_level = joliet_level;
925 /* Make sure the root inode is a directory */
926 if (!S_ISDIR(inode->i_mode)) {
928 "isofs_fill_super: root inode is not a directory. "
929 "Corrupted media?\n");
936 if (opt.check == 'r')
939 s->s_d_op = &isofs_dentry_ops[table];
941 /* get the root dentry */
942 s->s_root = d_alloc_root(inode);
946 kfree(opt.iocharset);
951 * Display error messages and free resources.
957 error = PTR_ERR(inode);
958 if (error != -ENOMEM)
959 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
962 unload_nls(sbi->s_nls_iocharset);
966 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
967 __func__, s->s_id, iso_blknum, block);
970 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
971 sbi->s_log_zone_size);
974 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
975 orig_zonesize, opt.blocksize);
979 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
985 kfree(opt.iocharset);
991 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
993 struct super_block *sb = dentry->d_sb;
994 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
996 buf->f_type = ISOFS_SUPER_MAGIC;
997 buf->f_bsize = sb->s_blocksize;
998 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
999 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1002 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1004 buf->f_fsid.val[0] = (u32)id;
1005 buf->f_fsid.val[1] = (u32)(id >> 32);
1006 buf->f_namelen = NAME_MAX;
1011 * Get a set of blocks; filling in buffer_heads if already allocated
1012 * or getblk() if they are not. Returns the number of blocks inserted
1015 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1016 struct buffer_head **bh, unsigned long nblocks)
1018 unsigned long b_off = iblock;
1019 unsigned offset, sect_size;
1020 unsigned int firstext;
1021 unsigned long nextblk, nextoff;
1022 int section, rv, error;
1023 struct iso_inode_info *ei = ISOFS_I(inode);
1027 if (iblock != b_off) {
1028 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1034 firstext = ei->i_first_extent;
1035 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1036 nextblk = ei->i_next_section_block;
1037 nextoff = ei->i_next_section_offset;
1041 /* If we are *way* beyond the end of the file, print a message.
1042 * Access beyond the end of the file up to the next page boundary
1043 * is normal, however because of the way the page cache works.
1044 * In this case, we just return 0 so that we can properly fill
1045 * the page with useless information without generating any
1048 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1049 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1051 (unsigned long long)inode->i_size);
1055 /* On the last section, nextblk == 0, section size is likely to
1056 * exceed sect_size by a partial block, and access beyond the
1057 * end of the file will reach beyond the section size, too.
1059 while (nextblk && (b_off >= (offset + sect_size))) {
1060 struct inode *ninode;
1062 offset += sect_size;
1063 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1064 if (IS_ERR(ninode)) {
1065 error = PTR_ERR(ninode);
1068 firstext = ISOFS_I(ninode)->i_first_extent;
1069 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1070 nextblk = ISOFS_I(ninode)->i_next_section_block;
1071 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1074 if (++section > 100) {
1075 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1076 " aborting...\n", __func__);
1077 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1078 "nextblk=%lu nextoff=%lu\n", __func__,
1079 b_off, firstext, (unsigned) sect_size,
1086 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1088 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1092 bh++; /* Next buffer head */
1093 b_off++; /* Next buffer offset */
1100 return rv != 0 ? rv : error;
1104 * Used by the standard interfaces.
1106 static int isofs_get_block(struct inode *inode, sector_t iblock,
1107 struct buffer_head *bh_result, int create)
1112 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1116 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1117 return ret < 0 ? ret : 0;
1120 static int isofs_bmap(struct inode *inode, sector_t block)
1122 struct buffer_head dummy;
1126 dummy.b_blocknr = -1000;
1127 error = isofs_get_block(inode, block, &dummy, 0);
1129 return dummy.b_blocknr;
1133 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1135 sector_t blknr = isofs_bmap(inode, block);
1138 return sb_bread(inode->i_sb, blknr);
1141 static int isofs_readpage(struct file *file, struct page *page)
1143 return mpage_readpage(page, isofs_get_block);
1146 static int isofs_readpages(struct file *file, struct address_space *mapping,
1147 struct list_head *pages, unsigned nr_pages)
1149 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1152 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1154 return generic_block_bmap(mapping,block,isofs_get_block);
1157 static const struct address_space_operations isofs_aops = {
1158 .readpage = isofs_readpage,
1159 .readpages = isofs_readpages,
1163 static int isofs_read_level3_size(struct inode *inode)
1165 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1166 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1167 struct buffer_head *bh = NULL;
1168 unsigned long block, offset, block_saved, offset_saved;
1170 int more_entries = 0;
1171 struct iso_directory_record *tmpde = NULL;
1172 struct iso_inode_info *ei = ISOFS_I(inode);
1176 /* The first 16 blocks are reserved as the System Area. Thus,
1177 * no inodes can appear in block 0. We use this to flag that
1178 * this is the last section. */
1179 ei->i_next_section_block = 0;
1180 ei->i_next_section_offset = 0;
1182 block = ei->i_iget5_block;
1183 offset = ei->i_iget5_offset;
1186 struct iso_directory_record *de;
1187 unsigned int de_len;
1190 bh = sb_bread(inode->i_sb, block);
1194 de = (struct iso_directory_record *) (bh->b_data + offset);
1195 de_len = *(unsigned char *) de;
1205 block_saved = block;
1206 offset_saved = offset;
1209 /* Make sure we have a full directory entry */
1210 if (offset >= bufsize) {
1211 int slop = bufsize - offset + de_len;
1213 tmpde = kmalloc(256, GFP_KERNEL);
1217 memcpy(tmpde, de, slop);
1218 offset &= bufsize - 1;
1223 bh = sb_bread(inode->i_sb, block);
1226 memcpy((void *)tmpde+slop, bh->b_data, offset);
1231 inode->i_size += isonum_733(de->size);
1233 ei->i_next_section_block = block_saved;
1234 ei->i_next_section_offset = offset_saved;
1237 more_entries = de->flags[-high_sierra] & 0x80;
1242 } while (more_entries);
1255 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1260 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1261 "isofs_read_level3_size: inode=%lu\n",
1262 __func__, inode->i_ino);
1266 static int isofs_read_inode(struct inode *inode, int relocated)
1268 struct super_block *sb = inode->i_sb;
1269 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1270 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1271 unsigned long block;
1272 int high_sierra = sbi->s_high_sierra;
1273 struct buffer_head *bh = NULL;
1274 struct iso_directory_record *de;
1275 struct iso_directory_record *tmpde = NULL;
1276 unsigned int de_len;
1277 unsigned long offset;
1278 struct iso_inode_info *ei = ISOFS_I(inode);
1281 block = ei->i_iget5_block;
1282 bh = sb_bread(inode->i_sb, block);
1286 offset = ei->i_iget5_offset;
1288 de = (struct iso_directory_record *) (bh->b_data + offset);
1289 de_len = *(unsigned char *) de;
1291 if (offset + de_len > bufsize) {
1292 int frag1 = bufsize - offset;
1294 tmpde = kmalloc(de_len, GFP_KERNEL);
1295 if (tmpde == NULL) {
1296 printk(KERN_INFO "%s: out of memory\n", __func__);
1300 memcpy(tmpde, bh->b_data + offset, frag1);
1302 bh = sb_bread(inode->i_sb, ++block);
1305 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1309 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1311 ISOFS_BUFFER_BITS(inode));
1313 /* Assume it is a normal-format file unless told otherwise */
1314 ei->i_file_format = isofs_file_normal;
1316 if (de->flags[-high_sierra] & 2) {
1317 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1318 inode->i_mode = S_IFDIR | sbi->s_dmode;
1320 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1321 set_nlink(inode, 1); /*
1322 * Set to 1. We know there are 2, but
1323 * the find utility tries to optimize
1324 * if it is 2, and it screws up. It is
1325 * easier to give 1 which tells find to
1326 * do it the hard way.
1329 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1330 inode->i_mode = S_IFREG | sbi->s_fmode;
1333 * Set default permissions: r-x for all. The disc
1334 * could be shared with DOS machines so virtually
1335 * anything could be a valid executable.
1337 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1339 set_nlink(inode, 1);
1341 inode->i_uid = sbi->s_uid;
1342 inode->i_gid = sbi->s_gid;
1343 inode->i_blocks = 0;
1345 ei->i_format_parm[0] = 0;
1346 ei->i_format_parm[1] = 0;
1347 ei->i_format_parm[2] = 0;
1349 ei->i_section_size = isonum_733(de->size);
1350 if (de->flags[-high_sierra] & 0x80) {
1351 ret = isofs_read_level3_size(inode);
1356 ei->i_next_section_block = 0;
1357 ei->i_next_section_offset = 0;
1358 inode->i_size = isonum_733(de->size);
1362 * Some dipshit decided to store some other bit of information
1363 * in the high byte of the file length. Truncate size in case
1364 * this CDROM was mounted with the cruft option.
1368 inode->i_size &= 0x00ffffff;
1370 if (de->interleave[0]) {
1371 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1375 /* I have no idea what file_unit_size is used for, so
1376 we will flag it for now */
1377 if (de->file_unit_size[0] != 0) {
1378 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1382 /* I have no idea what other flag bits are used for, so
1383 we will flag it for now */
1385 if((de->flags[-high_sierra] & ~2)!= 0){
1386 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1388 inode->i_ino, de->flags[-high_sierra]);
1392 inode->i_mtime.tv_sec =
1393 inode->i_atime.tv_sec =
1394 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1395 inode->i_mtime.tv_nsec =
1396 inode->i_atime.tv_nsec =
1397 inode->i_ctime.tv_nsec = 0;
1399 ei->i_first_extent = (isonum_733(de->extent) +
1400 isonum_711(de->ext_attr_length));
1402 /* Set the number of blocks for stat() - should be done before RR */
1403 inode->i_blocks = (inode->i_size + 511) >> 9;
1406 * Now test for possible Rock Ridge extensions which will override
1407 * some of these numbers in the inode structure.
1411 parse_rock_ridge_inode(de, inode, relocated);
1412 /* if we want uid/gid set, override the rock ridge setting */
1414 inode->i_uid = sbi->s_uid;
1416 inode->i_gid = sbi->s_gid;
1418 /* Now set final access rights if overriding rock ridge setting */
1419 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1420 sbi->s_dmode != ISOFS_INVALID_MODE)
1421 inode->i_mode = S_IFDIR | sbi->s_dmode;
1422 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1423 sbi->s_fmode != ISOFS_INVALID_MODE)
1424 inode->i_mode = S_IFREG | sbi->s_fmode;
1426 /* Install the inode operations vector */
1427 if (S_ISREG(inode->i_mode)) {
1428 inode->i_fop = &generic_ro_fops;
1429 switch (ei->i_file_format) {
1430 #ifdef CONFIG_ZISOFS
1431 case isofs_file_compressed:
1432 inode->i_data.a_ops = &zisofs_aops;
1436 inode->i_data.a_ops = &isofs_aops;
1439 } else if (S_ISDIR(inode->i_mode)) {
1440 inode->i_op = &isofs_dir_inode_operations;
1441 inode->i_fop = &isofs_dir_operations;
1442 } else if (S_ISLNK(inode->i_mode)) {
1443 inode->i_op = &page_symlink_inode_operations;
1444 inode->i_data.a_ops = &isofs_symlink_aops;
1446 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1447 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1457 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1462 struct isofs_iget5_callback_data {
1463 unsigned long block;
1464 unsigned long offset;
1467 static int isofs_iget5_test(struct inode *ino, void *data)
1469 struct iso_inode_info *i = ISOFS_I(ino);
1470 struct isofs_iget5_callback_data *d =
1471 (struct isofs_iget5_callback_data*)data;
1472 return (i->i_iget5_block == d->block)
1473 && (i->i_iget5_offset == d->offset);
1476 static int isofs_iget5_set(struct inode *ino, void *data)
1478 struct iso_inode_info *i = ISOFS_I(ino);
1479 struct isofs_iget5_callback_data *d =
1480 (struct isofs_iget5_callback_data*)data;
1481 i->i_iget5_block = d->block;
1482 i->i_iget5_offset = d->offset;
1486 /* Store, in the inode's containing structure, the block and block
1487 * offset that point to the underlying meta-data for the inode. The
1488 * code below is otherwise similar to the iget() code in
1489 * include/linux/fs.h */
1490 struct inode *__isofs_iget(struct super_block *sb,
1491 unsigned long block,
1492 unsigned long offset,
1495 unsigned long hashval;
1496 struct inode *inode;
1497 struct isofs_iget5_callback_data data;
1500 if (offset >= 1ul << sb->s_blocksize_bits)
1501 return ERR_PTR(-EINVAL);
1504 data.offset = offset;
1506 hashval = (block << sb->s_blocksize_bits) | offset;
1508 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1509 &isofs_iget5_set, &data);
1512 return ERR_PTR(-ENOMEM);
1514 if (inode->i_state & I_NEW) {
1515 ret = isofs_read_inode(inode, relocated);
1518 inode = ERR_PTR(ret);
1520 unlock_new_inode(inode);
1527 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1528 int flags, const char *dev_name, void *data)
1530 /* We don't support read-write mounts */
1531 if (!(flags & MS_RDONLY))
1532 return ERR_PTR(-EACCES);
1533 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1536 static struct file_system_type iso9660_fs_type = {
1537 .owner = THIS_MODULE,
1539 .mount = isofs_mount,
1540 .kill_sb = kill_block_super,
1541 .fs_flags = FS_REQUIRES_DEV,
1544 static int __init init_iso9660_fs(void)
1546 int err = init_inodecache();
1549 #ifdef CONFIG_ZISOFS
1550 err = zisofs_init();
1554 err = register_filesystem(&iso9660_fs_type);
1559 #ifdef CONFIG_ZISOFS
1563 destroy_inodecache();
1568 static void __exit exit_iso9660_fs(void)
1570 unregister_filesystem(&iso9660_fs_type);
1571 #ifdef CONFIG_ZISOFS
1574 destroy_inodecache();
1577 module_init(init_iso9660_fs)
1578 module_exit(exit_iso9660_fs)
1579 MODULE_LICENSE("GPL");
1580 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1581 MODULE_ALIAS("iso9660");