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>
24 #include <linux/user_namespace.h>
31 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
32 static int isofs_dentry_cmpi(const struct dentry *parent,
33 const struct dentry *dentry,
34 unsigned int len, const char *str, const struct qstr *name);
37 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
38 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
39 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
40 const struct dentry *dentry,
41 unsigned int len, const char *str, const struct qstr *name);
42 static int isofs_dentry_cmp_ms(const struct dentry *parent,
43 const struct dentry *dentry,
44 unsigned int len, const char *str, const struct qstr *name);
47 static void isofs_put_super(struct super_block *sb)
49 struct isofs_sb_info *sbi = ISOFS_SB(sb);
52 unload_nls(sbi->s_nls_iocharset);
60 static int isofs_read_inode(struct inode *, int relocated);
61 static int isofs_statfs (struct dentry *, struct kstatfs *);
63 static struct kmem_cache *isofs_inode_cachep;
65 static struct inode *isofs_alloc_inode(struct super_block *sb)
67 struct iso_inode_info *ei;
68 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
71 return &ei->vfs_inode;
74 static void isofs_i_callback(struct rcu_head *head)
76 struct inode *inode = container_of(head, struct inode, i_rcu);
77 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
80 static void isofs_destroy_inode(struct inode *inode)
82 call_rcu(&inode->i_rcu, isofs_i_callback);
85 static void init_once(void *foo)
87 struct iso_inode_info *ei = foo;
89 inode_init_once(&ei->vfs_inode);
92 static int __init init_inodecache(void)
94 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
95 sizeof(struct iso_inode_info),
96 0, (SLAB_RECLAIM_ACCOUNT|
99 if (isofs_inode_cachep == NULL)
104 static void destroy_inodecache(void)
107 * Make sure all delayed rcu free inodes are flushed before we
111 kmem_cache_destroy(isofs_inode_cachep);
114 static int isofs_remount(struct super_block *sb, int *flags, char *data)
117 if (!(*flags & MS_RDONLY))
122 static const struct super_operations isofs_sops = {
123 .alloc_inode = isofs_alloc_inode,
124 .destroy_inode = isofs_destroy_inode,
125 .put_super = isofs_put_super,
126 .statfs = isofs_statfs,
127 .remount_fs = isofs_remount,
128 .show_options = generic_show_options,
132 static const struct dentry_operations isofs_dentry_ops[] = {
134 .d_hash = isofs_hashi,
135 .d_compare = isofs_dentry_cmpi,
139 .d_hash = isofs_hash_ms,
140 .d_compare = isofs_dentry_cmp_ms,
143 .d_hash = isofs_hashi_ms,
144 .d_compare = isofs_dentry_cmpi_ms,
149 struct iso9660_options{
151 unsigned int joliet:1;
152 unsigned int cruft:1;
154 unsigned int showassoc:1;
155 unsigned int nocompress:1;
156 unsigned int overriderockperm:1;
157 unsigned int uid_set:1;
158 unsigned int gid_set:1;
162 unsigned int blocksize;
174 * Compute the hash for the isofs name corresponding to the dentry.
177 isofs_hashi_common(struct qstr *qstr, int ms)
187 while (len && name[len-1] == '.')
191 hash = init_name_hash();
193 c = tolower(*name++);
194 hash = partial_name_hash(c, hash);
196 qstr->hash = end_name_hash(hash);
202 * Compare of two isofs names.
204 static int isofs_dentry_cmp_common(
205 unsigned int len, const char *str,
206 const struct qstr *name, int ms, int ci)
210 /* A filename cannot end in '.' or we treat it like it has none */
214 while (alen && name->name[alen-1] == '.')
216 while (blen && str[blen-1] == '.')
221 if (strncasecmp(name->name, str, alen) == 0)
224 if (strncmp(name->name, str, alen) == 0)
232 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
234 return isofs_hashi_common(qstr, 0);
238 isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry,
239 unsigned int len, const char *str, const struct qstr *name)
241 return isofs_dentry_cmp_common(len, str, name, 0, 1);
246 * Compute the hash for the isofs name corresponding to the dentry.
249 isofs_hash_common(struct qstr *qstr, int ms)
257 while (len && name[len-1] == '.')
261 qstr->hash = full_name_hash(name, len);
267 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
269 return isofs_hash_common(qstr, 1);
273 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
275 return isofs_hashi_common(qstr, 1);
279 isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry,
280 unsigned int len, const char *str, const struct qstr *name)
282 return isofs_dentry_cmp_common(len, str, name, 1, 0);
286 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
287 unsigned int len, const char *str, const struct qstr *name)
289 return isofs_dentry_cmp_common(len, str, name, 1, 1);
294 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
295 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
296 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
297 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
300 static const match_table_t tokens = {
301 {Opt_norock, "norock"},
302 {Opt_nojoliet, "nojoliet"},
303 {Opt_unhide, "unhide"},
305 {Opt_showassoc, "showassoc"},
306 {Opt_cruft, "cruft"},
308 {Opt_iocharset, "iocharset=%s"},
309 {Opt_map_a, "map=acorn"},
310 {Opt_map_a, "map=a"},
311 {Opt_map_n, "map=normal"},
312 {Opt_map_n, "map=n"},
313 {Opt_map_o, "map=off"},
314 {Opt_map_o, "map=o"},
315 {Opt_session, "session=%u"},
316 {Opt_sb, "sbsector=%u"},
317 {Opt_check_r, "check=relaxed"},
318 {Opt_check_r, "check=r"},
319 {Opt_check_s, "check=strict"},
320 {Opt_check_s, "check=s"},
323 {Opt_mode, "mode=%u"},
324 {Opt_dmode, "dmode=%u"},
325 {Opt_overriderockperm, "overriderockperm"},
326 {Opt_block, "block=%u"},
327 {Opt_ignore, "conv=binary"},
328 {Opt_ignore, "conv=b"},
329 {Opt_ignore, "conv=text"},
330 {Opt_ignore, "conv=t"},
331 {Opt_ignore, "conv=mtext"},
332 {Opt_ignore, "conv=m"},
333 {Opt_ignore, "conv=auto"},
334 {Opt_ignore, "conv=a"},
335 {Opt_nocompress, "nocompress"},
339 static int parse_options(char *options, struct iso9660_options *popt)
350 popt->check = 'u'; /* unset */
351 popt->nocompress = 0;
352 popt->blocksize = 1024;
353 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
356 popt->gid = GLOBAL_ROOT_GID;
357 popt->uid = GLOBAL_ROOT_UID;
358 popt->iocharset = NULL;
360 popt->overriderockperm = 0;
366 while ((p = strsep(&options, ",")) != NULL) {
368 substring_t args[MAX_OPT_ARGS];
374 token = match_token(p, tokens, args);
397 popt->iocharset = match_strdup(&args[0]);
410 if (match_int(&args[0], &option))
415 popt->session = n + 1;
418 if (match_int(&args[0], &option))
420 popt->sbsector = option;
431 if (match_int(&args[0], &option))
433 popt->uid = make_kuid(current_user_ns(), option);
434 if (!uid_valid(popt->uid))
439 if (match_int(&args[0], &option))
441 popt->gid = make_kgid(current_user_ns(), option);
442 if (!gid_valid(popt->gid))
447 if (match_int(&args[0], &option))
449 popt->fmode = option;
452 if (match_int(&args[0], &option))
454 popt->dmode = option;
456 case Opt_overriderockperm:
457 popt->overriderockperm = 1;
460 if (match_int(&args[0], &option))
463 if (n != 512 && n != 1024 && n != 2048)
468 popt->nocompress = 1;
478 * look if the driver can tell the multi session redirection value
480 * don't change this if you don't know what you do, please!
481 * Multisession is legal only with XA disks.
482 * A non-XA disk with more than one volume descriptor may do it right, but
483 * usually is written in a nowhere standardized "multi-partition" manner.
484 * Multisession uses absolute addressing (solely the first frame of the whole
485 * track is #0), multi-partition uses relative addressing (each first frame of
486 * each track is #0), and a track is not a session.
488 * A broken CDwriter software or drive firmware does not set new standards,
489 * at least not if conflicting with the existing ones.
493 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
495 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
497 struct cdrom_multisession ms_info;
498 unsigned int vol_desc_start;
499 struct block_device *bdev = sb->s_bdev;
503 ms_info.addr_format=CDROM_LBA;
504 if(session >= 0 && session <= 99) {
505 struct cdrom_tocentry Te;
506 Te.cdte_track=session;
507 Te.cdte_format=CDROM_LBA;
508 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
510 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
511 session, Te.cdte_addr.lba,
512 Te.cdte_ctrl&CDROM_DATA_TRACK);
513 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
514 return Te.cdte_addr.lba;
517 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
519 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
521 printk(KERN_ERR "ISOFS: Invalid session number\n");
523 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
525 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
526 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
530 #if WE_OBEY_THE_WRITTEN_STANDARDS
531 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
533 vol_desc_start=ms_info.addr.lba;
534 return vol_desc_start;
538 * Check if root directory is empty (has less than 3 files).
540 * Used to detect broken CDs where ISO root directory is empty but Joliet root
541 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
542 * (and Joliet used instead) or else no files would be visible.
544 static bool rootdir_empty(struct super_block *sb, unsigned long block)
546 int offset = 0, files = 0, de_len;
547 struct iso_directory_record *de;
548 struct buffer_head *bh;
550 bh = sb_bread(sb, block);
554 de = (struct iso_directory_record *) (bh->b_data + offset);
555 de_len = *(unsigned char *) de;
566 * Initialize the superblock and read the root inode.
568 * Note: a check_disk_change() has been done immediately prior
569 * to this call, so we don't need to check again.
571 static int isofs_fill_super(struct super_block *s, void *data, int silent)
573 struct buffer_head *bh = NULL, *pri_bh = NULL;
574 struct hs_primary_descriptor *h_pri = NULL;
575 struct iso_primary_descriptor *pri = NULL;
576 struct iso_supplementary_descriptor *sec = NULL;
577 struct iso_directory_record *rootp;
579 struct iso9660_options opt;
580 struct isofs_sb_info *sbi;
581 unsigned long first_data_zone;
582 int joliet_level = 0;
583 int iso_blknum, block;
585 int table, error = -EINVAL;
586 unsigned int vol_desc_start;
588 save_mount_options(s, data);
590 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
595 if (!parse_options((char *)data, &opt))
599 * First of all, get the hardware blocksize for this device.
600 * If we don't know what it is, or the hardware blocksize is
601 * larger than the blocksize the user specified, then use
605 * What if bugger tells us to go beyond page size?
607 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
609 sbi->s_high_sierra = 0; /* default is iso9660 */
611 vol_desc_start = (opt.sbsector != -1) ?
612 opt.sbsector : isofs_get_last_session(s,opt.session);
614 for (iso_blknum = vol_desc_start+16;
615 iso_blknum < vol_desc_start+100; iso_blknum++) {
616 struct hs_volume_descriptor *hdp;
617 struct iso_volume_descriptor *vdp;
619 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
620 if (!(bh = sb_bread(s, block)))
623 vdp = (struct iso_volume_descriptor *)bh->b_data;
624 hdp = (struct hs_volume_descriptor *)bh->b_data;
627 * Due to the overlapping physical location of the descriptors,
628 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
629 * proper identification in this case, we first check for ISO.
631 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
632 if (isonum_711(vdp->type) == ISO_VD_END)
634 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
636 pri = (struct iso_primary_descriptor *)vdp;
637 /* Save the buffer in case we need it ... */
643 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
644 sec = (struct iso_supplementary_descriptor *)vdp;
645 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
647 if (sec->escape[2] == 0x40)
649 else if (sec->escape[2] == 0x43)
651 else if (sec->escape[2] == 0x45)
654 printk(KERN_DEBUG "ISO 9660 Extensions: "
655 "Microsoft Joliet Level %d\n",
660 /* Unknown supplementary volume descriptor */
666 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
667 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
670 sbi->s_high_sierra = 1;
672 h_pri = (struct hs_primary_descriptor *)vdp;
677 /* Just skip any volume descriptors we don't recognize */
683 * If we fall through, either no volume descriptor was found,
684 * or else we passed a primary descriptor looking for others.
687 goto out_unknown_format;
693 /* We don't support read-write mounts */
694 if (!(s->s_flags & MS_RDONLY)) {
699 if (joliet_level && (pri == NULL || !opt.rock)) {
700 /* This is the case of Joliet with the norock mount flag.
701 * A disc with both Joliet and Rock Ridge is handled later
703 pri = (struct iso_primary_descriptor *) sec;
706 if(sbi->s_high_sierra){
707 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
708 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
709 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
710 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
714 rootp = (struct iso_directory_record *) pri->root_directory_record;
715 sbi->s_nzones = isonum_733(pri->volume_space_size);
716 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
717 sbi->s_max_size = isonum_733(pri->volume_space_size);
720 sbi->s_ninodes = 0; /* No way to figure this out easily */
722 orig_zonesize = sbi->s_log_zone_size;
724 * If the zone size is smaller than the hardware sector size,
725 * this is a fatal error. This would occur if the disc drive
726 * had sectors that were 2048 bytes, but the filesystem had
727 * blocks that were 512 bytes (which should only very rarely
730 if (orig_zonesize < opt.blocksize)
733 /* RDE: convert log zone size to bit shift */
734 switch (sbi->s_log_zone_size) {
735 case 512: sbi->s_log_zone_size = 9; break;
736 case 1024: sbi->s_log_zone_size = 10; break;
737 case 2048: sbi->s_log_zone_size = 11; break;
740 goto out_bad_zone_size;
743 s->s_magic = ISOFS_SUPER_MAGIC;
746 * With multi-extent files, file size is only limited by the maximum
747 * size of a file system, which is 8 TB.
749 s->s_maxbytes = 0x80000000000LL;
751 /* Set this for reference. Its not currently used except on write
752 which we don't have .. */
754 first_data_zone = isonum_733(rootp->extent) +
755 isonum_711(rootp->ext_attr_length);
756 sbi->s_firstdatazone = first_data_zone;
758 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
759 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
760 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
761 if(sbi->s_high_sierra)
762 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
766 * If the Joliet level is set, we _may_ decide to use the
767 * secondary descriptor, but can't be sure until after we
768 * read the root inode. But before reading the root inode
769 * we may need to change the device blocksize, and would
770 * rather release the old buffer first. So, we cache the
771 * first_data_zone value from the secondary descriptor.
774 pri = (struct iso_primary_descriptor *) sec;
775 rootp = (struct iso_directory_record *)
776 pri->root_directory_record;
777 first_data_zone = isonum_733(rootp->extent) +
778 isonum_711(rootp->ext_attr_length);
782 * We're all done using the volume descriptor, and may need
783 * to change the device blocksize, so release the buffer now.
789 * Force the blocksize to 512 for 512 byte sectors. The file
790 * read primitives really get it wrong in a bad way if we don't
793 * Note - we should never be setting the blocksize to something
794 * less than the hardware sector size for the device. If we
795 * do, we would end up having to read larger buffers and split
796 * out portions to satisfy requests.
798 * Note2- the idea here is that we want to deal with the optimal
799 * zonesize in the filesystem. If we have it set to something less,
800 * then we have horrible problems with trying to piece together
801 * bits of adjacent blocks in order to properly read directory
802 * entries. By forcing the blocksize in this way, we ensure
803 * that we will never be required to do this.
805 sb_set_blocksize(s, orig_zonesize);
807 sbi->s_nls_iocharset = NULL;
810 if (joliet_level && opt.utf8 == 0) {
811 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
812 sbi->s_nls_iocharset = load_nls(p);
813 if (! sbi->s_nls_iocharset) {
814 /* Fail only if explicit charset specified */
817 sbi->s_nls_iocharset = load_nls_default();
821 s->s_op = &isofs_sops;
822 s->s_export_op = &isofs_export_ops;
823 sbi->s_mapping = opt.map;
824 sbi->s_rock = (opt.rock ? 2 : 0);
825 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
826 sbi->s_cruft = opt.cruft;
827 sbi->s_hide = opt.hide;
828 sbi->s_showassoc = opt.showassoc;
829 sbi->s_uid = opt.uid;
830 sbi->s_gid = opt.gid;
831 sbi->s_uid_set = opt.uid_set;
832 sbi->s_gid_set = opt.gid_set;
833 sbi->s_utf8 = opt.utf8;
834 sbi->s_nocompress = opt.nocompress;
835 sbi->s_overriderockperm = opt.overriderockperm;
837 * It would be incredibly stupid to allow people to mark every file
838 * on the disk as suid, so we merely allow them to set the default
841 if (opt.fmode != ISOFS_INVALID_MODE)
842 sbi->s_fmode = opt.fmode & 0777;
844 sbi->s_fmode = ISOFS_INVALID_MODE;
845 if (opt.dmode != ISOFS_INVALID_MODE)
846 sbi->s_dmode = opt.dmode & 0777;
848 sbi->s_dmode = ISOFS_INVALID_MODE;
851 * Read the root inode, which _may_ result in changing
852 * the s_rock flag. Once we have the final s_rock value,
853 * we then decide whether to use the Joliet descriptor.
855 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
860 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
861 * correct Joliet root directory.
863 if (sbi->s_rock == 1 && joliet_level &&
864 rootdir_empty(s, sbi->s_firstdatazone)) {
866 "ISOFS: primary root directory is empty. "
867 "Disabling Rock Ridge and switching to Joliet.");
872 * If this disk has both Rock Ridge and Joliet on it, then we
873 * want to use Rock Ridge by default. This can be overridden
874 * by using the norock mount option. There is still one other
875 * possibility that is not taken into account: a Rock Ridge
876 * CD with Unicode names. Until someone sees such a beast, it
877 * will not be supported.
879 if (sbi->s_rock == 1) {
881 } else if (joliet_level) {
883 if (sbi->s_firstdatazone != first_data_zone) {
884 sbi->s_firstdatazone = first_data_zone;
886 "ISOFS: changing to secondary root\n");
888 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
894 if (opt.check == 'u') {
895 /* Only Joliet is case insensitive by default */
901 sbi->s_joliet_level = joliet_level;
903 /* Make sure the root inode is a directory */
904 if (!S_ISDIR(inode->i_mode)) {
906 "isofs_fill_super: root inode is not a directory. "
907 "Corrupted media?\n");
914 if (opt.check == 'r')
918 s->s_d_op = &isofs_dentry_ops[table - 1];
920 /* get the root dentry */
921 s->s_root = d_make_root(inode);
927 kfree(opt.iocharset);
932 * Display error messages and free resources.
938 error = PTR_ERR(inode);
939 if (error != -ENOMEM)
940 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
943 unload_nls(sbi->s_nls_iocharset);
947 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
948 __func__, s->s_id, iso_blknum, block);
951 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
952 sbi->s_log_zone_size);
955 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
956 orig_zonesize, opt.blocksize);
960 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
966 kfree(opt.iocharset);
972 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
974 struct super_block *sb = dentry->d_sb;
975 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
977 buf->f_type = ISOFS_SUPER_MAGIC;
978 buf->f_bsize = sb->s_blocksize;
979 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
980 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
983 buf->f_files = ISOFS_SB(sb)->s_ninodes;
985 buf->f_fsid.val[0] = (u32)id;
986 buf->f_fsid.val[1] = (u32)(id >> 32);
987 buf->f_namelen = NAME_MAX;
992 * Get a set of blocks; filling in buffer_heads if already allocated
993 * or getblk() if they are not. Returns the number of blocks inserted
996 int isofs_get_blocks(struct inode *inode, sector_t iblock,
997 struct buffer_head **bh, unsigned long nblocks)
999 unsigned long b_off = iblock;
1000 unsigned offset, sect_size;
1001 unsigned int firstext;
1002 unsigned long nextblk, nextoff;
1003 int section, rv, error;
1004 struct iso_inode_info *ei = ISOFS_I(inode);
1008 if (iblock != b_off) {
1009 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1015 firstext = ei->i_first_extent;
1016 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1017 nextblk = ei->i_next_section_block;
1018 nextoff = ei->i_next_section_offset;
1022 /* If we are *way* beyond the end of the file, print a message.
1023 * Access beyond the end of the file up to the next page boundary
1024 * is normal, however because of the way the page cache works.
1025 * In this case, we just return 0 so that we can properly fill
1026 * the page with useless information without generating any
1029 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1030 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1032 (unsigned long long)inode->i_size);
1036 /* On the last section, nextblk == 0, section size is likely to
1037 * exceed sect_size by a partial block, and access beyond the
1038 * end of the file will reach beyond the section size, too.
1040 while (nextblk && (b_off >= (offset + sect_size))) {
1041 struct inode *ninode;
1043 offset += sect_size;
1044 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1045 if (IS_ERR(ninode)) {
1046 error = PTR_ERR(ninode);
1049 firstext = ISOFS_I(ninode)->i_first_extent;
1050 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1051 nextblk = ISOFS_I(ninode)->i_next_section_block;
1052 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1055 if (++section > 100) {
1056 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1057 " aborting...\n", __func__);
1058 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1059 "nextblk=%lu nextoff=%lu\n", __func__,
1060 b_off, firstext, (unsigned) sect_size,
1067 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1069 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1073 bh++; /* Next buffer head */
1074 b_off++; /* Next buffer offset */
1081 return rv != 0 ? rv : error;
1085 * Used by the standard interfaces.
1087 static int isofs_get_block(struct inode *inode, sector_t iblock,
1088 struct buffer_head *bh_result, int create)
1093 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1097 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1098 return ret < 0 ? ret : 0;
1101 static int isofs_bmap(struct inode *inode, sector_t block)
1103 struct buffer_head dummy;
1107 dummy.b_blocknr = -1000;
1108 error = isofs_get_block(inode, block, &dummy, 0);
1110 return dummy.b_blocknr;
1114 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1116 sector_t blknr = isofs_bmap(inode, block);
1119 return sb_bread(inode->i_sb, blknr);
1122 static int isofs_readpage(struct file *file, struct page *page)
1124 return mpage_readpage(page, isofs_get_block);
1127 static int isofs_readpages(struct file *file, struct address_space *mapping,
1128 struct list_head *pages, unsigned nr_pages)
1130 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1133 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1135 return generic_block_bmap(mapping,block,isofs_get_block);
1138 static const struct address_space_operations isofs_aops = {
1139 .readpage = isofs_readpage,
1140 .readpages = isofs_readpages,
1144 static int isofs_read_level3_size(struct inode *inode)
1146 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1147 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1148 struct buffer_head *bh = NULL;
1149 unsigned long block, offset, block_saved, offset_saved;
1151 int more_entries = 0;
1152 struct iso_directory_record *tmpde = NULL;
1153 struct iso_inode_info *ei = ISOFS_I(inode);
1157 /* The first 16 blocks are reserved as the System Area. Thus,
1158 * no inodes can appear in block 0. We use this to flag that
1159 * this is the last section. */
1160 ei->i_next_section_block = 0;
1161 ei->i_next_section_offset = 0;
1163 block = ei->i_iget5_block;
1164 offset = ei->i_iget5_offset;
1167 struct iso_directory_record *de;
1168 unsigned int de_len;
1171 bh = sb_bread(inode->i_sb, block);
1175 de = (struct iso_directory_record *) (bh->b_data + offset);
1176 de_len = *(unsigned char *) de;
1186 block_saved = block;
1187 offset_saved = offset;
1190 /* Make sure we have a full directory entry */
1191 if (offset >= bufsize) {
1192 int slop = bufsize - offset + de_len;
1194 tmpde = kmalloc(256, GFP_KERNEL);
1198 memcpy(tmpde, de, slop);
1199 offset &= bufsize - 1;
1204 bh = sb_bread(inode->i_sb, block);
1207 memcpy((void *)tmpde+slop, bh->b_data, offset);
1212 inode->i_size += isonum_733(de->size);
1214 ei->i_next_section_block = block_saved;
1215 ei->i_next_section_offset = offset_saved;
1218 more_entries = de->flags[-high_sierra] & 0x80;
1223 } while (more_entries);
1236 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1241 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1242 "isofs_read_level3_size: inode=%lu\n",
1243 __func__, inode->i_ino);
1247 static int isofs_read_inode(struct inode *inode, int relocated)
1249 struct super_block *sb = inode->i_sb;
1250 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1251 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1252 unsigned long block;
1253 int high_sierra = sbi->s_high_sierra;
1254 struct buffer_head *bh = NULL;
1255 struct iso_directory_record *de;
1256 struct iso_directory_record *tmpde = NULL;
1257 unsigned int de_len;
1258 unsigned long offset;
1259 struct iso_inode_info *ei = ISOFS_I(inode);
1262 block = ei->i_iget5_block;
1263 bh = sb_bread(inode->i_sb, block);
1267 offset = ei->i_iget5_offset;
1269 de = (struct iso_directory_record *) (bh->b_data + offset);
1270 de_len = *(unsigned char *) de;
1272 if (offset + de_len > bufsize) {
1273 int frag1 = bufsize - offset;
1275 tmpde = kmalloc(de_len, GFP_KERNEL);
1276 if (tmpde == NULL) {
1277 printk(KERN_INFO "%s: out of memory\n", __func__);
1281 memcpy(tmpde, bh->b_data + offset, frag1);
1283 bh = sb_bread(inode->i_sb, ++block);
1286 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1290 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1292 ISOFS_BUFFER_BITS(inode));
1294 /* Assume it is a normal-format file unless told otherwise */
1295 ei->i_file_format = isofs_file_normal;
1297 if (de->flags[-high_sierra] & 2) {
1298 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1299 inode->i_mode = S_IFDIR | sbi->s_dmode;
1301 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1302 set_nlink(inode, 1); /*
1303 * Set to 1. We know there are 2, but
1304 * the find utility tries to optimize
1305 * if it is 2, and it screws up. It is
1306 * easier to give 1 which tells find to
1307 * do it the hard way.
1310 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1311 inode->i_mode = S_IFREG | sbi->s_fmode;
1314 * Set default permissions: r-x for all. The disc
1315 * could be shared with DOS machines so virtually
1316 * anything could be a valid executable.
1318 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1320 set_nlink(inode, 1);
1322 inode->i_uid = sbi->s_uid;
1323 inode->i_gid = sbi->s_gid;
1324 inode->i_blocks = 0;
1326 ei->i_format_parm[0] = 0;
1327 ei->i_format_parm[1] = 0;
1328 ei->i_format_parm[2] = 0;
1330 ei->i_section_size = isonum_733(de->size);
1331 if (de->flags[-high_sierra] & 0x80) {
1332 ret = isofs_read_level3_size(inode);
1337 ei->i_next_section_block = 0;
1338 ei->i_next_section_offset = 0;
1339 inode->i_size = isonum_733(de->size);
1343 * Some dipshit decided to store some other bit of information
1344 * in the high byte of the file length. Truncate size in case
1345 * this CDROM was mounted with the cruft option.
1349 inode->i_size &= 0x00ffffff;
1351 if (de->interleave[0]) {
1352 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1356 /* I have no idea what file_unit_size is used for, so
1357 we will flag it for now */
1358 if (de->file_unit_size[0] != 0) {
1359 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1363 /* I have no idea what other flag bits are used for, so
1364 we will flag it for now */
1366 if((de->flags[-high_sierra] & ~2)!= 0){
1367 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1369 inode->i_ino, de->flags[-high_sierra]);
1373 inode->i_mtime.tv_sec =
1374 inode->i_atime.tv_sec =
1375 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1376 inode->i_mtime.tv_nsec =
1377 inode->i_atime.tv_nsec =
1378 inode->i_ctime.tv_nsec = 0;
1380 ei->i_first_extent = (isonum_733(de->extent) +
1381 isonum_711(de->ext_attr_length));
1383 /* Set the number of blocks for stat() - should be done before RR */
1384 inode->i_blocks = (inode->i_size + 511) >> 9;
1387 * Now test for possible Rock Ridge extensions which will override
1388 * some of these numbers in the inode structure.
1392 parse_rock_ridge_inode(de, inode, relocated);
1393 /* if we want uid/gid set, override the rock ridge setting */
1395 inode->i_uid = sbi->s_uid;
1397 inode->i_gid = sbi->s_gid;
1399 /* Now set final access rights if overriding rock ridge setting */
1400 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1401 sbi->s_dmode != ISOFS_INVALID_MODE)
1402 inode->i_mode = S_IFDIR | sbi->s_dmode;
1403 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1404 sbi->s_fmode != ISOFS_INVALID_MODE)
1405 inode->i_mode = S_IFREG | sbi->s_fmode;
1407 /* Install the inode operations vector */
1408 if (S_ISREG(inode->i_mode)) {
1409 inode->i_fop = &generic_ro_fops;
1410 switch (ei->i_file_format) {
1411 #ifdef CONFIG_ZISOFS
1412 case isofs_file_compressed:
1413 inode->i_data.a_ops = &zisofs_aops;
1417 inode->i_data.a_ops = &isofs_aops;
1420 } else if (S_ISDIR(inode->i_mode)) {
1421 inode->i_op = &isofs_dir_inode_operations;
1422 inode->i_fop = &isofs_dir_operations;
1423 } else if (S_ISLNK(inode->i_mode)) {
1424 inode->i_op = &page_symlink_inode_operations;
1425 inode->i_data.a_ops = &isofs_symlink_aops;
1427 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1428 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1438 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1443 struct isofs_iget5_callback_data {
1444 unsigned long block;
1445 unsigned long offset;
1448 static int isofs_iget5_test(struct inode *ino, void *data)
1450 struct iso_inode_info *i = ISOFS_I(ino);
1451 struct isofs_iget5_callback_data *d =
1452 (struct isofs_iget5_callback_data*)data;
1453 return (i->i_iget5_block == d->block)
1454 && (i->i_iget5_offset == d->offset);
1457 static int isofs_iget5_set(struct inode *ino, void *data)
1459 struct iso_inode_info *i = ISOFS_I(ino);
1460 struct isofs_iget5_callback_data *d =
1461 (struct isofs_iget5_callback_data*)data;
1462 i->i_iget5_block = d->block;
1463 i->i_iget5_offset = d->offset;
1467 /* Store, in the inode's containing structure, the block and block
1468 * offset that point to the underlying meta-data for the inode. The
1469 * code below is otherwise similar to the iget() code in
1470 * include/linux/fs.h */
1471 struct inode *__isofs_iget(struct super_block *sb,
1472 unsigned long block,
1473 unsigned long offset,
1476 unsigned long hashval;
1477 struct inode *inode;
1478 struct isofs_iget5_callback_data data;
1481 if (offset >= 1ul << sb->s_blocksize_bits)
1482 return ERR_PTR(-EINVAL);
1485 data.offset = offset;
1487 hashval = (block << sb->s_blocksize_bits) | offset;
1489 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1490 &isofs_iget5_set, &data);
1493 return ERR_PTR(-ENOMEM);
1495 if (inode->i_state & I_NEW) {
1496 ret = isofs_read_inode(inode, relocated);
1499 inode = ERR_PTR(ret);
1501 unlock_new_inode(inode);
1508 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1509 int flags, const char *dev_name, void *data)
1511 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1514 static struct file_system_type iso9660_fs_type = {
1515 .owner = THIS_MODULE,
1517 .mount = isofs_mount,
1518 .kill_sb = kill_block_super,
1519 .fs_flags = FS_REQUIRES_DEV,
1521 MODULE_ALIAS_FS("iso9660");
1522 MODULE_ALIAS("iso9660");
1524 static int __init init_iso9660_fs(void)
1526 int err = init_inodecache();
1529 #ifdef CONFIG_ZISOFS
1530 err = zisofs_init();
1534 err = register_filesystem(&iso9660_fs_type);
1539 #ifdef CONFIG_ZISOFS
1543 destroy_inodecache();
1548 static void __exit exit_iso9660_fs(void)
1550 unregister_filesystem(&iso9660_fs_type);
1551 #ifdef CONFIG_ZISOFS
1554 destroy_inodecache();
1557 module_init(init_iso9660_fs)
1558 module_exit(exit_iso9660_fs)
1559 MODULE_LICENSE("GPL");