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, const struct inode *inode,
33 static int isofs_hash(const struct dentry *parent, const struct inode *inode,
35 static int isofs_dentry_cmpi(const struct dentry *parent,
36 const struct inode *pinode,
37 const struct dentry *dentry, const struct inode *inode,
38 unsigned int len, const char *str, const struct qstr *name);
39 static int isofs_dentry_cmp(const struct dentry *parent,
40 const struct inode *pinode,
41 const struct dentry *dentry, const struct inode *inode,
42 unsigned int len, const char *str, const struct qstr *name);
45 static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
47 static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
49 static int isofs_dentry_cmpi_ms(const struct dentry *parent,
50 const struct inode *pinode,
51 const struct dentry *dentry, const struct inode *inode,
52 unsigned int len, const char *str, const struct qstr *name);
53 static int isofs_dentry_cmp_ms(const struct dentry *parent,
54 const struct inode *pinode,
55 const struct dentry *dentry, const struct inode *inode,
56 unsigned int len, const char *str, const struct qstr *name);
59 static void isofs_put_super(struct super_block *sb)
61 struct isofs_sb_info *sbi = ISOFS_SB(sb);
64 unload_nls(sbi->s_nls_iocharset);
72 static int isofs_read_inode(struct inode *);
73 static int isofs_statfs (struct dentry *, struct kstatfs *);
75 static struct kmem_cache *isofs_inode_cachep;
77 static struct inode *isofs_alloc_inode(struct super_block *sb)
79 struct iso_inode_info *ei;
80 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
83 return &ei->vfs_inode;
86 static void isofs_i_callback(struct rcu_head *head)
88 struct inode *inode = container_of(head, struct inode, i_rcu);
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 /* we probably want a lot more here */
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;
387 popt->gid = GLOBAL_ROOT_GID;
388 popt->uid = GLOBAL_ROOT_UID;
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))
464 popt->uid = make_kuid(current_user_ns(), option);
465 if (!uid_valid(popt->uid))
470 if (match_int(&args[0], &option))
472 popt->gid = make_kgid(current_user_ns(), option);
473 if (!gid_valid(popt->gid))
478 if (match_int(&args[0], &option))
480 popt->fmode = option;
483 if (match_int(&args[0], &option))
485 popt->dmode = option;
487 case Opt_overriderockperm:
488 popt->overriderockperm = 1;
491 if (match_int(&args[0], &option))
494 if (n != 512 && n != 1024 && n != 2048)
499 popt->nocompress = 1;
509 * look if the driver can tell the multi session redirection value
511 * don't change this if you don't know what you do, please!
512 * Multisession is legal only with XA disks.
513 * A non-XA disk with more than one volume descriptor may do it right, but
514 * usually is written in a nowhere standardized "multi-partition" manner.
515 * Multisession uses absolute addressing (solely the first frame of the whole
516 * track is #0), multi-partition uses relative addressing (each first frame of
517 * each track is #0), and a track is not a session.
519 * A broken CDwriter software or drive firmware does not set new standards,
520 * at least not if conflicting with the existing ones.
524 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
526 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
528 struct cdrom_multisession ms_info;
529 unsigned int vol_desc_start;
530 struct block_device *bdev = sb->s_bdev;
534 ms_info.addr_format=CDROM_LBA;
535 if(session >= 0 && session <= 99) {
536 struct cdrom_tocentry Te;
537 Te.cdte_track=session;
538 Te.cdte_format=CDROM_LBA;
539 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
541 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
542 session, Te.cdte_addr.lba,
543 Te.cdte_ctrl&CDROM_DATA_TRACK);
544 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
545 return Te.cdte_addr.lba;
548 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
550 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
552 printk(KERN_ERR "ISOFS: Invalid session number\n");
554 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
556 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
557 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
561 #if WE_OBEY_THE_WRITTEN_STANDARDS
562 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
564 vol_desc_start=ms_info.addr.lba;
565 return vol_desc_start;
569 * Check if root directory is empty (has less than 3 files).
571 * Used to detect broken CDs where ISO root directory is empty but Joliet root
572 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
573 * (and Joliet used instead) or else no files would be visible.
575 static bool rootdir_empty(struct super_block *sb, unsigned long block)
577 int offset = 0, files = 0, de_len;
578 struct iso_directory_record *de;
579 struct buffer_head *bh;
581 bh = sb_bread(sb, block);
585 de = (struct iso_directory_record *) (bh->b_data + offset);
586 de_len = *(unsigned char *) de;
597 * Initialize the superblock and read the root inode.
599 * Note: a check_disk_change() has been done immediately prior
600 * to this call, so we don't need to check again.
602 static int isofs_fill_super(struct super_block *s, void *data, int silent)
604 struct buffer_head *bh = NULL, *pri_bh = NULL;
605 struct hs_primary_descriptor *h_pri = NULL;
606 struct iso_primary_descriptor *pri = NULL;
607 struct iso_supplementary_descriptor *sec = NULL;
608 struct iso_directory_record *rootp;
610 struct iso9660_options opt;
611 struct isofs_sb_info *sbi;
612 unsigned long first_data_zone;
613 int joliet_level = 0;
614 int iso_blknum, block;
616 int table, error = -EINVAL;
617 unsigned int vol_desc_start;
619 save_mount_options(s, data);
621 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
626 if (!parse_options((char *)data, &opt))
630 * First of all, get the hardware blocksize for this device.
631 * If we don't know what it is, or the hardware blocksize is
632 * larger than the blocksize the user specified, then use
636 * What if bugger tells us to go beyond page size?
638 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
640 sbi->s_high_sierra = 0; /* default is iso9660 */
642 vol_desc_start = (opt.sbsector != -1) ?
643 opt.sbsector : isofs_get_last_session(s,opt.session);
645 for (iso_blknum = vol_desc_start+16;
646 iso_blknum < vol_desc_start+100; iso_blknum++) {
647 struct hs_volume_descriptor *hdp;
648 struct iso_volume_descriptor *vdp;
650 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
651 if (!(bh = sb_bread(s, block)))
654 vdp = (struct iso_volume_descriptor *)bh->b_data;
655 hdp = (struct hs_volume_descriptor *)bh->b_data;
658 * Due to the overlapping physical location of the descriptors,
659 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
660 * proper identification in this case, we first check for ISO.
662 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
663 if (isonum_711(vdp->type) == ISO_VD_END)
665 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
667 pri = (struct iso_primary_descriptor *)vdp;
668 /* Save the buffer in case we need it ... */
674 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
675 sec = (struct iso_supplementary_descriptor *)vdp;
676 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
678 if (sec->escape[2] == 0x40)
680 else if (sec->escape[2] == 0x43)
682 else if (sec->escape[2] == 0x45)
685 printk(KERN_DEBUG "ISO 9660 Extensions: "
686 "Microsoft Joliet Level %d\n",
691 /* Unknown supplementary volume descriptor */
697 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
698 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
701 sbi->s_high_sierra = 1;
703 h_pri = (struct hs_primary_descriptor *)vdp;
708 /* Just skip any volume descriptors we don't recognize */
714 * If we fall through, either no volume descriptor was found,
715 * or else we passed a primary descriptor looking for others.
718 goto out_unknown_format;
725 if (joliet_level && (pri == NULL || !opt.rock)) {
726 /* This is the case of Joliet with the norock mount flag.
727 * A disc with both Joliet and Rock Ridge is handled later
729 pri = (struct iso_primary_descriptor *) sec;
732 if(sbi->s_high_sierra){
733 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
734 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
735 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
736 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
740 rootp = (struct iso_directory_record *) pri->root_directory_record;
741 sbi->s_nzones = isonum_733(pri->volume_space_size);
742 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
743 sbi->s_max_size = isonum_733(pri->volume_space_size);
746 sbi->s_ninodes = 0; /* No way to figure this out easily */
748 orig_zonesize = sbi->s_log_zone_size;
750 * If the zone size is smaller than the hardware sector size,
751 * this is a fatal error. This would occur if the disc drive
752 * had sectors that were 2048 bytes, but the filesystem had
753 * blocks that were 512 bytes (which should only very rarely
756 if (orig_zonesize < opt.blocksize)
759 /* RDE: convert log zone size to bit shift */
760 switch (sbi->s_log_zone_size) {
761 case 512: sbi->s_log_zone_size = 9; break;
762 case 1024: sbi->s_log_zone_size = 10; break;
763 case 2048: sbi->s_log_zone_size = 11; break;
766 goto out_bad_zone_size;
769 s->s_magic = ISOFS_SUPER_MAGIC;
772 * With multi-extent files, file size is only limited by the maximum
773 * size of a file system, which is 8 TB.
775 s->s_maxbytes = 0x80000000000LL;
778 * The CDROM is read-only, has no nodes (devices) on it, and since
779 * all of the files appear to be owned by root, we really do not want
780 * to allow suid. (suid or devices will not show up unless we have
781 * Rock Ridge extensions)
784 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
786 /* Set this for reference. Its not currently used except on write
787 which we don't have .. */
789 first_data_zone = isonum_733(rootp->extent) +
790 isonum_711(rootp->ext_attr_length);
791 sbi->s_firstdatazone = first_data_zone;
793 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
794 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
795 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
796 if(sbi->s_high_sierra)
797 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
801 * If the Joliet level is set, we _may_ decide to use the
802 * secondary descriptor, but can't be sure until after we
803 * read the root inode. But before reading the root inode
804 * we may need to change the device blocksize, and would
805 * rather release the old buffer first. So, we cache the
806 * first_data_zone value from the secondary descriptor.
809 pri = (struct iso_primary_descriptor *) sec;
810 rootp = (struct iso_directory_record *)
811 pri->root_directory_record;
812 first_data_zone = isonum_733(rootp->extent) +
813 isonum_711(rootp->ext_attr_length);
817 * We're all done using the volume descriptor, and may need
818 * to change the device blocksize, so release the buffer now.
824 * Force the blocksize to 512 for 512 byte sectors. The file
825 * read primitives really get it wrong in a bad way if we don't
828 * Note - we should never be setting the blocksize to something
829 * less than the hardware sector size for the device. If we
830 * do, we would end up having to read larger buffers and split
831 * out portions to satisfy requests.
833 * Note2- the idea here is that we want to deal with the optimal
834 * zonesize in the filesystem. If we have it set to something less,
835 * then we have horrible problems with trying to piece together
836 * bits of adjacent blocks in order to properly read directory
837 * entries. By forcing the blocksize in this way, we ensure
838 * that we will never be required to do this.
840 sb_set_blocksize(s, orig_zonesize);
842 sbi->s_nls_iocharset = NULL;
845 if (joliet_level && opt.utf8 == 0) {
846 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
847 sbi->s_nls_iocharset = load_nls(p);
848 if (! sbi->s_nls_iocharset) {
849 /* Fail only if explicit charset specified */
852 sbi->s_nls_iocharset = load_nls_default();
856 s->s_op = &isofs_sops;
857 s->s_export_op = &isofs_export_ops;
858 sbi->s_mapping = opt.map;
859 sbi->s_rock = (opt.rock ? 2 : 0);
860 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
861 sbi->s_cruft = opt.cruft;
862 sbi->s_hide = opt.hide;
863 sbi->s_showassoc = opt.showassoc;
864 sbi->s_uid = opt.uid;
865 sbi->s_gid = opt.gid;
866 sbi->s_uid_set = opt.uid_set;
867 sbi->s_gid_set = opt.gid_set;
868 sbi->s_utf8 = opt.utf8;
869 sbi->s_nocompress = opt.nocompress;
870 sbi->s_overriderockperm = opt.overriderockperm;
872 * It would be incredibly stupid to allow people to mark every file
873 * on the disk as suid, so we merely allow them to set the default
876 if (opt.fmode != ISOFS_INVALID_MODE)
877 sbi->s_fmode = opt.fmode & 0777;
879 sbi->s_fmode = ISOFS_INVALID_MODE;
880 if (opt.dmode != ISOFS_INVALID_MODE)
881 sbi->s_dmode = opt.dmode & 0777;
883 sbi->s_dmode = ISOFS_INVALID_MODE;
886 * Read the root inode, which _may_ result in changing
887 * the s_rock flag. Once we have the final s_rock value,
888 * we then decide whether to use the Joliet descriptor.
890 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
895 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
896 * correct Joliet root directory.
898 if (sbi->s_rock == 1 && joliet_level &&
899 rootdir_empty(s, sbi->s_firstdatazone)) {
901 "ISOFS: primary root directory is empty. "
902 "Disabling Rock Ridge and switching to Joliet.");
907 * If this disk has both Rock Ridge and Joliet on it, then we
908 * want to use Rock Ridge by default. This can be overridden
909 * by using the norock mount option. There is still one other
910 * possibility that is not taken into account: a Rock Ridge
911 * CD with Unicode names. Until someone sees such a beast, it
912 * will not be supported.
914 if (sbi->s_rock == 1) {
916 } else if (joliet_level) {
918 if (sbi->s_firstdatazone != first_data_zone) {
919 sbi->s_firstdatazone = first_data_zone;
921 "ISOFS: changing to secondary root\n");
923 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
929 if (opt.check == 'u') {
930 /* Only Joliet is case insensitive by default */
936 sbi->s_joliet_level = joliet_level;
938 /* Make sure the root inode is a directory */
939 if (!S_ISDIR(inode->i_mode)) {
941 "isofs_fill_super: root inode is not a directory. "
942 "Corrupted media?\n");
949 if (opt.check == 'r')
952 s->s_d_op = &isofs_dentry_ops[table];
954 /* get the root dentry */
955 s->s_root = d_make_root(inode);
961 kfree(opt.iocharset);
966 * Display error messages and free resources.
972 error = PTR_ERR(inode);
973 if (error != -ENOMEM)
974 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
977 unload_nls(sbi->s_nls_iocharset);
981 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
982 __func__, s->s_id, iso_blknum, block);
985 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
986 sbi->s_log_zone_size);
989 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
990 orig_zonesize, opt.blocksize);
994 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1000 kfree(opt.iocharset);
1002 s->s_fs_info = NULL;
1006 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1008 struct super_block *sb = dentry->d_sb;
1009 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1011 buf->f_type = ISOFS_SUPER_MAGIC;
1012 buf->f_bsize = sb->s_blocksize;
1013 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1014 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1017 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1019 buf->f_fsid.val[0] = (u32)id;
1020 buf->f_fsid.val[1] = (u32)(id >> 32);
1021 buf->f_namelen = NAME_MAX;
1026 * Get a set of blocks; filling in buffer_heads if already allocated
1027 * or getblk() if they are not. Returns the number of blocks inserted
1030 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1031 struct buffer_head **bh, unsigned long nblocks)
1033 unsigned long b_off = iblock;
1034 unsigned offset, sect_size;
1035 unsigned int firstext;
1036 unsigned long nextblk, nextoff;
1037 int section, rv, error;
1038 struct iso_inode_info *ei = ISOFS_I(inode);
1042 if (iblock != b_off) {
1043 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1049 firstext = ei->i_first_extent;
1050 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1051 nextblk = ei->i_next_section_block;
1052 nextoff = ei->i_next_section_offset;
1056 /* If we are *way* beyond the end of the file, print a message.
1057 * Access beyond the end of the file up to the next page boundary
1058 * is normal, however because of the way the page cache works.
1059 * In this case, we just return 0 so that we can properly fill
1060 * the page with useless information without generating any
1063 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1064 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1066 (unsigned long long)inode->i_size);
1070 /* On the last section, nextblk == 0, section size is likely to
1071 * exceed sect_size by a partial block, and access beyond the
1072 * end of the file will reach beyond the section size, too.
1074 while (nextblk && (b_off >= (offset + sect_size))) {
1075 struct inode *ninode;
1077 offset += sect_size;
1078 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1079 if (IS_ERR(ninode)) {
1080 error = PTR_ERR(ninode);
1083 firstext = ISOFS_I(ninode)->i_first_extent;
1084 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1085 nextblk = ISOFS_I(ninode)->i_next_section_block;
1086 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1089 if (++section > 100) {
1090 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1091 " aborting...\n", __func__);
1092 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1093 "nextblk=%lu nextoff=%lu\n", __func__,
1094 b_off, firstext, (unsigned) sect_size,
1101 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1103 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1107 bh++; /* Next buffer head */
1108 b_off++; /* Next buffer offset */
1115 return rv != 0 ? rv : error;
1119 * Used by the standard interfaces.
1121 static int isofs_get_block(struct inode *inode, sector_t iblock,
1122 struct buffer_head *bh_result, int create)
1127 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1131 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1132 return ret < 0 ? ret : 0;
1135 static int isofs_bmap(struct inode *inode, sector_t block)
1137 struct buffer_head dummy;
1141 dummy.b_blocknr = -1000;
1142 error = isofs_get_block(inode, block, &dummy, 0);
1144 return dummy.b_blocknr;
1148 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1150 sector_t blknr = isofs_bmap(inode, block);
1153 return sb_bread(inode->i_sb, blknr);
1156 static int isofs_readpage(struct file *file, struct page *page)
1158 return mpage_readpage(page, isofs_get_block);
1161 static int isofs_readpages(struct file *file, struct address_space *mapping,
1162 struct list_head *pages, unsigned nr_pages)
1164 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1167 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1169 return generic_block_bmap(mapping,block,isofs_get_block);
1172 static const struct address_space_operations isofs_aops = {
1173 .readpage = isofs_readpage,
1174 .readpages = isofs_readpages,
1178 static int isofs_read_level3_size(struct inode *inode)
1180 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1181 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1182 struct buffer_head *bh = NULL;
1183 unsigned long block, offset, block_saved, offset_saved;
1185 int more_entries = 0;
1186 struct iso_directory_record *tmpde = NULL;
1187 struct iso_inode_info *ei = ISOFS_I(inode);
1191 /* The first 16 blocks are reserved as the System Area. Thus,
1192 * no inodes can appear in block 0. We use this to flag that
1193 * this is the last section. */
1194 ei->i_next_section_block = 0;
1195 ei->i_next_section_offset = 0;
1197 block = ei->i_iget5_block;
1198 offset = ei->i_iget5_offset;
1201 struct iso_directory_record *de;
1202 unsigned int de_len;
1205 bh = sb_bread(inode->i_sb, block);
1209 de = (struct iso_directory_record *) (bh->b_data + offset);
1210 de_len = *(unsigned char *) de;
1220 block_saved = block;
1221 offset_saved = offset;
1224 /* Make sure we have a full directory entry */
1225 if (offset >= bufsize) {
1226 int slop = bufsize - offset + de_len;
1228 tmpde = kmalloc(256, GFP_KERNEL);
1232 memcpy(tmpde, de, slop);
1233 offset &= bufsize - 1;
1238 bh = sb_bread(inode->i_sb, block);
1241 memcpy((void *)tmpde+slop, bh->b_data, offset);
1246 inode->i_size += isonum_733(de->size);
1248 ei->i_next_section_block = block_saved;
1249 ei->i_next_section_offset = offset_saved;
1252 more_entries = de->flags[-high_sierra] & 0x80;
1257 } while (more_entries);
1270 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1275 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1276 "isofs_read_level3_size: inode=%lu\n",
1277 __func__, inode->i_ino);
1281 static int isofs_read_inode(struct inode *inode)
1283 struct super_block *sb = inode->i_sb;
1284 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1285 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1286 unsigned long block;
1287 int high_sierra = sbi->s_high_sierra;
1288 struct buffer_head *bh = NULL;
1289 struct iso_directory_record *de;
1290 struct iso_directory_record *tmpde = NULL;
1291 unsigned int de_len;
1292 unsigned long offset;
1293 struct iso_inode_info *ei = ISOFS_I(inode);
1296 block = ei->i_iget5_block;
1297 bh = sb_bread(inode->i_sb, block);
1301 offset = ei->i_iget5_offset;
1303 de = (struct iso_directory_record *) (bh->b_data + offset);
1304 de_len = *(unsigned char *) de;
1306 if (offset + de_len > bufsize) {
1307 int frag1 = bufsize - offset;
1309 tmpde = kmalloc(de_len, GFP_KERNEL);
1310 if (tmpde == NULL) {
1311 printk(KERN_INFO "%s: out of memory\n", __func__);
1315 memcpy(tmpde, bh->b_data + offset, frag1);
1317 bh = sb_bread(inode->i_sb, ++block);
1320 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1324 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1326 ISOFS_BUFFER_BITS(inode));
1328 /* Assume it is a normal-format file unless told otherwise */
1329 ei->i_file_format = isofs_file_normal;
1331 if (de->flags[-high_sierra] & 2) {
1332 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1333 inode->i_mode = S_IFDIR | sbi->s_dmode;
1335 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1336 set_nlink(inode, 1); /*
1337 * Set to 1. We know there are 2, but
1338 * the find utility tries to optimize
1339 * if it is 2, and it screws up. It is
1340 * easier to give 1 which tells find to
1341 * do it the hard way.
1344 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1345 inode->i_mode = S_IFREG | sbi->s_fmode;
1348 * Set default permissions: r-x for all. The disc
1349 * could be shared with DOS machines so virtually
1350 * anything could be a valid executable.
1352 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1354 set_nlink(inode, 1);
1356 inode->i_uid = sbi->s_uid;
1357 inode->i_gid = sbi->s_gid;
1358 inode->i_blocks = 0;
1360 ei->i_format_parm[0] = 0;
1361 ei->i_format_parm[1] = 0;
1362 ei->i_format_parm[2] = 0;
1364 ei->i_section_size = isonum_733(de->size);
1365 if (de->flags[-high_sierra] & 0x80) {
1366 ret = isofs_read_level3_size(inode);
1371 ei->i_next_section_block = 0;
1372 ei->i_next_section_offset = 0;
1373 inode->i_size = isonum_733(de->size);
1377 * Some dipshit decided to store some other bit of information
1378 * in the high byte of the file length. Truncate size in case
1379 * this CDROM was mounted with the cruft option.
1383 inode->i_size &= 0x00ffffff;
1385 if (de->interleave[0]) {
1386 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1390 /* I have no idea what file_unit_size is used for, so
1391 we will flag it for now */
1392 if (de->file_unit_size[0] != 0) {
1393 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1397 /* I have no idea what other flag bits are used for, so
1398 we will flag it for now */
1400 if((de->flags[-high_sierra] & ~2)!= 0){
1401 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1403 inode->i_ino, de->flags[-high_sierra]);
1407 inode->i_mtime.tv_sec =
1408 inode->i_atime.tv_sec =
1409 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1410 inode->i_mtime.tv_nsec =
1411 inode->i_atime.tv_nsec =
1412 inode->i_ctime.tv_nsec = 0;
1414 ei->i_first_extent = (isonum_733(de->extent) +
1415 isonum_711(de->ext_attr_length));
1417 /* Set the number of blocks for stat() - should be done before RR */
1418 inode->i_blocks = (inode->i_size + 511) >> 9;
1421 * Now test for possible Rock Ridge extensions which will override
1422 * some of these numbers in the inode structure.
1426 parse_rock_ridge_inode(de, inode);
1427 /* if we want uid/gid set, override the rock ridge setting */
1429 inode->i_uid = sbi->s_uid;
1431 inode->i_gid = sbi->s_gid;
1433 /* Now set final access rights if overriding rock ridge setting */
1434 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1435 sbi->s_dmode != ISOFS_INVALID_MODE)
1436 inode->i_mode = S_IFDIR | sbi->s_dmode;
1437 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1438 sbi->s_fmode != ISOFS_INVALID_MODE)
1439 inode->i_mode = S_IFREG | sbi->s_fmode;
1441 /* Install the inode operations vector */
1442 if (S_ISREG(inode->i_mode)) {
1443 inode->i_fop = &generic_ro_fops;
1444 switch (ei->i_file_format) {
1445 #ifdef CONFIG_ZISOFS
1446 case isofs_file_compressed:
1447 inode->i_data.a_ops = &zisofs_aops;
1451 inode->i_data.a_ops = &isofs_aops;
1454 } else if (S_ISDIR(inode->i_mode)) {
1455 inode->i_op = &isofs_dir_inode_operations;
1456 inode->i_fop = &isofs_dir_operations;
1457 } else if (S_ISLNK(inode->i_mode)) {
1458 inode->i_op = &page_symlink_inode_operations;
1459 inode->i_data.a_ops = &isofs_symlink_aops;
1461 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1462 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1472 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1477 struct isofs_iget5_callback_data {
1478 unsigned long block;
1479 unsigned long offset;
1482 static int isofs_iget5_test(struct inode *ino, void *data)
1484 struct iso_inode_info *i = ISOFS_I(ino);
1485 struct isofs_iget5_callback_data *d =
1486 (struct isofs_iget5_callback_data*)data;
1487 return (i->i_iget5_block == d->block)
1488 && (i->i_iget5_offset == d->offset);
1491 static int isofs_iget5_set(struct inode *ino, void *data)
1493 struct iso_inode_info *i = ISOFS_I(ino);
1494 struct isofs_iget5_callback_data *d =
1495 (struct isofs_iget5_callback_data*)data;
1496 i->i_iget5_block = d->block;
1497 i->i_iget5_offset = d->offset;
1501 /* Store, in the inode's containing structure, the block and block
1502 * offset that point to the underlying meta-data for the inode. The
1503 * code below is otherwise similar to the iget() code in
1504 * include/linux/fs.h */
1505 struct inode *isofs_iget(struct super_block *sb,
1506 unsigned long block,
1507 unsigned long offset)
1509 unsigned long hashval;
1510 struct inode *inode;
1511 struct isofs_iget5_callback_data data;
1514 if (offset >= 1ul << sb->s_blocksize_bits)
1515 return ERR_PTR(-EINVAL);
1518 data.offset = offset;
1520 hashval = (block << sb->s_blocksize_bits) | offset;
1522 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1523 &isofs_iget5_set, &data);
1526 return ERR_PTR(-ENOMEM);
1528 if (inode->i_state & I_NEW) {
1529 ret = isofs_read_inode(inode);
1532 inode = ERR_PTR(ret);
1534 unlock_new_inode(inode);
1541 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1542 int flags, const char *dev_name, void *data)
1544 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1547 static struct file_system_type iso9660_fs_type = {
1548 .owner = THIS_MODULE,
1550 .mount = isofs_mount,
1551 .kill_sb = kill_block_super,
1552 .fs_flags = FS_REQUIRES_DEV,
1555 static int __init init_iso9660_fs(void)
1557 int err = init_inodecache();
1560 #ifdef CONFIG_ZISOFS
1561 err = zisofs_init();
1565 err = register_filesystem(&iso9660_fs_type);
1570 #ifdef CONFIG_ZISOFS
1574 destroy_inodecache();
1579 static void __exit exit_iso9660_fs(void)
1581 unregister_filesystem(&iso9660_fs_type);
1582 #ifdef CONFIG_ZISOFS
1585 destroy_inodecache();
1588 module_init(init_iso9660_fs)
1589 module_exit(exit_iso9660_fs)
1590 MODULE_LICENSE("GPL");
1591 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1592 MODULE_ALIAS("iso9660");