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)
119 * Make sure all delayed rcu free inodes are flushed before we
123 kmem_cache_destroy(isofs_inode_cachep);
126 static int isofs_remount(struct super_block *sb, int *flags, char *data)
128 if (!(*flags & MS_RDONLY))
133 static const struct super_operations isofs_sops = {
134 .alloc_inode = isofs_alloc_inode,
135 .destroy_inode = isofs_destroy_inode,
136 .put_super = isofs_put_super,
137 .statfs = isofs_statfs,
138 .remount_fs = isofs_remount,
139 .show_options = generic_show_options,
143 static const struct dentry_operations isofs_dentry_ops[] = {
145 .d_hash = isofs_hash,
146 .d_compare = isofs_dentry_cmp,
149 .d_hash = isofs_hashi,
150 .d_compare = isofs_dentry_cmpi,
154 .d_hash = isofs_hash_ms,
155 .d_compare = isofs_dentry_cmp_ms,
158 .d_hash = isofs_hashi_ms,
159 .d_compare = isofs_dentry_cmpi_ms,
164 struct iso9660_options{
166 unsigned int joliet:1;
167 unsigned int cruft:1;
169 unsigned int showassoc:1;
170 unsigned int nocompress:1;
171 unsigned int overriderockperm:1;
172 unsigned int uid_set:1;
173 unsigned int gid_set:1;
177 unsigned int blocksize;
189 * Compute the hash for the isofs name corresponding to the dentry.
192 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
200 while (len && name[len-1] == '.')
204 qstr->hash = full_name_hash(name, len);
210 * Compute the hash for the isofs name corresponding to the dentry.
213 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
223 while (len && name[len-1] == '.')
227 hash = init_name_hash();
229 c = tolower(*name++);
230 hash = partial_name_hash(c, hash);
232 qstr->hash = end_name_hash(hash);
238 * Compare of two isofs names.
240 static int isofs_dentry_cmp_common(
241 unsigned int len, const char *str,
242 const struct qstr *name, int ms, int ci)
246 /* A filename cannot end in '.' or we treat it like it has none */
250 while (alen && name->name[alen-1] == '.')
252 while (blen && str[blen-1] == '.')
257 if (strnicmp(name->name, str, alen) == 0)
260 if (strncmp(name->name, str, alen) == 0)
268 isofs_hash(const struct dentry *dentry, const struct inode *inode,
271 return isofs_hash_common(dentry, qstr, 0);
275 isofs_hashi(const struct dentry *dentry, const struct inode *inode,
278 return isofs_hashi_common(dentry, qstr, 0);
282 isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
283 const struct dentry *dentry, const struct inode *inode,
284 unsigned int len, const char *str, const struct qstr *name)
286 return isofs_dentry_cmp_common(len, str, name, 0, 0);
290 isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
291 const struct dentry *dentry, const struct inode *inode,
292 unsigned int len, const char *str, const struct qstr *name)
294 return isofs_dentry_cmp_common(len, str, name, 0, 1);
299 isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
302 return isofs_hash_common(dentry, qstr, 1);
306 isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
309 return isofs_hashi_common(dentry, qstr, 1);
313 isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
314 const struct dentry *dentry, const struct inode *inode,
315 unsigned int len, const char *str, const struct qstr *name)
317 return isofs_dentry_cmp_common(len, str, name, 1, 0);
321 isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
322 const struct dentry *dentry, const struct inode *inode,
323 unsigned int len, const char *str, const struct qstr *name)
325 return isofs_dentry_cmp_common(len, str, name, 1, 1);
330 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
331 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
332 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
333 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
336 static const match_table_t tokens = {
337 {Opt_norock, "norock"},
338 {Opt_nojoliet, "nojoliet"},
339 {Opt_unhide, "unhide"},
341 {Opt_showassoc, "showassoc"},
342 {Opt_cruft, "cruft"},
344 {Opt_iocharset, "iocharset=%s"},
345 {Opt_map_a, "map=acorn"},
346 {Opt_map_a, "map=a"},
347 {Opt_map_n, "map=normal"},
348 {Opt_map_n, "map=n"},
349 {Opt_map_o, "map=off"},
350 {Opt_map_o, "map=o"},
351 {Opt_session, "session=%u"},
352 {Opt_sb, "sbsector=%u"},
353 {Opt_check_r, "check=relaxed"},
354 {Opt_check_r, "check=r"},
355 {Opt_check_s, "check=strict"},
356 {Opt_check_s, "check=s"},
359 {Opt_mode, "mode=%u"},
360 {Opt_dmode, "dmode=%u"},
361 {Opt_overriderockperm, "overriderockperm"},
362 {Opt_block, "block=%u"},
363 {Opt_ignore, "conv=binary"},
364 {Opt_ignore, "conv=b"},
365 {Opt_ignore, "conv=text"},
366 {Opt_ignore, "conv=t"},
367 {Opt_ignore, "conv=mtext"},
368 {Opt_ignore, "conv=m"},
369 {Opt_ignore, "conv=auto"},
370 {Opt_ignore, "conv=a"},
371 {Opt_nocompress, "nocompress"},
375 static int parse_options(char *options, struct iso9660_options *popt)
386 popt->check = 'u'; /* unset */
387 popt->nocompress = 0;
388 popt->blocksize = 1024;
389 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
392 popt->gid = GLOBAL_ROOT_GID;
393 popt->uid = GLOBAL_ROOT_UID;
394 popt->iocharset = NULL;
396 popt->overriderockperm = 0;
402 while ((p = strsep(&options, ",")) != NULL) {
404 substring_t args[MAX_OPT_ARGS];
410 token = match_token(p, tokens, args);
433 popt->iocharset = match_strdup(&args[0]);
446 if (match_int(&args[0], &option))
451 popt->session = n + 1;
454 if (match_int(&args[0], &option))
456 popt->sbsector = option;
467 if (match_int(&args[0], &option))
469 popt->uid = make_kuid(current_user_ns(), option);
470 if (!uid_valid(popt->uid))
475 if (match_int(&args[0], &option))
477 popt->gid = make_kgid(current_user_ns(), option);
478 if (!gid_valid(popt->gid))
483 if (match_int(&args[0], &option))
485 popt->fmode = option;
488 if (match_int(&args[0], &option))
490 popt->dmode = option;
492 case Opt_overriderockperm:
493 popt->overriderockperm = 1;
496 if (match_int(&args[0], &option))
499 if (n != 512 && n != 1024 && n != 2048)
504 popt->nocompress = 1;
514 * look if the driver can tell the multi session redirection value
516 * don't change this if you don't know what you do, please!
517 * Multisession is legal only with XA disks.
518 * A non-XA disk with more than one volume descriptor may do it right, but
519 * usually is written in a nowhere standardized "multi-partition" manner.
520 * Multisession uses absolute addressing (solely the first frame of the whole
521 * track is #0), multi-partition uses relative addressing (each first frame of
522 * each track is #0), and a track is not a session.
524 * A broken CDwriter software or drive firmware does not set new standards,
525 * at least not if conflicting with the existing ones.
529 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
531 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
533 struct cdrom_multisession ms_info;
534 unsigned int vol_desc_start;
535 struct block_device *bdev = sb->s_bdev;
539 ms_info.addr_format=CDROM_LBA;
540 if(session >= 0 && session <= 99) {
541 struct cdrom_tocentry Te;
542 Te.cdte_track=session;
543 Te.cdte_format=CDROM_LBA;
544 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
546 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
547 session, Te.cdte_addr.lba,
548 Te.cdte_ctrl&CDROM_DATA_TRACK);
549 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
550 return Te.cdte_addr.lba;
553 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
555 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
557 printk(KERN_ERR "ISOFS: Invalid session number\n");
559 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
561 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
562 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
566 #if WE_OBEY_THE_WRITTEN_STANDARDS
567 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
569 vol_desc_start=ms_info.addr.lba;
570 return vol_desc_start;
574 * Check if root directory is empty (has less than 3 files).
576 * Used to detect broken CDs where ISO root directory is empty but Joliet root
577 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
578 * (and Joliet used instead) or else no files would be visible.
580 static bool rootdir_empty(struct super_block *sb, unsigned long block)
582 int offset = 0, files = 0, de_len;
583 struct iso_directory_record *de;
584 struct buffer_head *bh;
586 bh = sb_bread(sb, block);
590 de = (struct iso_directory_record *) (bh->b_data + offset);
591 de_len = *(unsigned char *) de;
602 * Initialize the superblock and read the root inode.
604 * Note: a check_disk_change() has been done immediately prior
605 * to this call, so we don't need to check again.
607 static int isofs_fill_super(struct super_block *s, void *data, int silent)
609 struct buffer_head *bh = NULL, *pri_bh = NULL;
610 struct hs_primary_descriptor *h_pri = NULL;
611 struct iso_primary_descriptor *pri = NULL;
612 struct iso_supplementary_descriptor *sec = NULL;
613 struct iso_directory_record *rootp;
615 struct iso9660_options opt;
616 struct isofs_sb_info *sbi;
617 unsigned long first_data_zone;
618 int joliet_level = 0;
619 int iso_blknum, block;
621 int table, error = -EINVAL;
622 unsigned int vol_desc_start;
624 save_mount_options(s, data);
626 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
631 if (!parse_options((char *)data, &opt))
635 * First of all, get the hardware blocksize for this device.
636 * If we don't know what it is, or the hardware blocksize is
637 * larger than the blocksize the user specified, then use
641 * What if bugger tells us to go beyond page size?
643 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
645 sbi->s_high_sierra = 0; /* default is iso9660 */
647 vol_desc_start = (opt.sbsector != -1) ?
648 opt.sbsector : isofs_get_last_session(s,opt.session);
650 for (iso_blknum = vol_desc_start+16;
651 iso_blknum < vol_desc_start+100; iso_blknum++) {
652 struct hs_volume_descriptor *hdp;
653 struct iso_volume_descriptor *vdp;
655 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
656 if (!(bh = sb_bread(s, block)))
659 vdp = (struct iso_volume_descriptor *)bh->b_data;
660 hdp = (struct hs_volume_descriptor *)bh->b_data;
663 * Due to the overlapping physical location of the descriptors,
664 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
665 * proper identification in this case, we first check for ISO.
667 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
668 if (isonum_711(vdp->type) == ISO_VD_END)
670 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
672 pri = (struct iso_primary_descriptor *)vdp;
673 /* Save the buffer in case we need it ... */
679 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
680 sec = (struct iso_supplementary_descriptor *)vdp;
681 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
683 if (sec->escape[2] == 0x40)
685 else if (sec->escape[2] == 0x43)
687 else if (sec->escape[2] == 0x45)
690 printk(KERN_DEBUG "ISO 9660 Extensions: "
691 "Microsoft Joliet Level %d\n",
696 /* Unknown supplementary volume descriptor */
702 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
703 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
706 sbi->s_high_sierra = 1;
708 h_pri = (struct hs_primary_descriptor *)vdp;
713 /* Just skip any volume descriptors we don't recognize */
719 * If we fall through, either no volume descriptor was found,
720 * or else we passed a primary descriptor looking for others.
723 goto out_unknown_format;
730 if (joliet_level && (pri == NULL || !opt.rock)) {
731 /* This is the case of Joliet with the norock mount flag.
732 * A disc with both Joliet and Rock Ridge is handled later
734 pri = (struct iso_primary_descriptor *) sec;
737 if(sbi->s_high_sierra){
738 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
739 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
740 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
741 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
745 rootp = (struct iso_directory_record *) pri->root_directory_record;
746 sbi->s_nzones = isonum_733(pri->volume_space_size);
747 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
748 sbi->s_max_size = isonum_733(pri->volume_space_size);
751 sbi->s_ninodes = 0; /* No way to figure this out easily */
753 orig_zonesize = sbi->s_log_zone_size;
755 * If the zone size is smaller than the hardware sector size,
756 * this is a fatal error. This would occur if the disc drive
757 * had sectors that were 2048 bytes, but the filesystem had
758 * blocks that were 512 bytes (which should only very rarely
761 if (orig_zonesize < opt.blocksize)
764 /* RDE: convert log zone size to bit shift */
765 switch (sbi->s_log_zone_size) {
766 case 512: sbi->s_log_zone_size = 9; break;
767 case 1024: sbi->s_log_zone_size = 10; break;
768 case 2048: sbi->s_log_zone_size = 11; break;
771 goto out_bad_zone_size;
774 s->s_magic = ISOFS_SUPER_MAGIC;
777 * With multi-extent files, file size is only limited by the maximum
778 * size of a file system, which is 8 TB.
780 s->s_maxbytes = 0x80000000000LL;
782 /* Set this for reference. Its not currently used except on write
783 which we don't have .. */
785 first_data_zone = isonum_733(rootp->extent) +
786 isonum_711(rootp->ext_attr_length);
787 sbi->s_firstdatazone = first_data_zone;
789 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
790 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
791 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
792 if(sbi->s_high_sierra)
793 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
797 * If the Joliet level is set, we _may_ decide to use the
798 * secondary descriptor, but can't be sure until after we
799 * read the root inode. But before reading the root inode
800 * we may need to change the device blocksize, and would
801 * rather release the old buffer first. So, we cache the
802 * first_data_zone value from the secondary descriptor.
805 pri = (struct iso_primary_descriptor *) sec;
806 rootp = (struct iso_directory_record *)
807 pri->root_directory_record;
808 first_data_zone = isonum_733(rootp->extent) +
809 isonum_711(rootp->ext_attr_length);
813 * We're all done using the volume descriptor, and may need
814 * to change the device blocksize, so release the buffer now.
820 * Force the blocksize to 512 for 512 byte sectors. The file
821 * read primitives really get it wrong in a bad way if we don't
824 * Note - we should never be setting the blocksize to something
825 * less than the hardware sector size for the device. If we
826 * do, we would end up having to read larger buffers and split
827 * out portions to satisfy requests.
829 * Note2- the idea here is that we want to deal with the optimal
830 * zonesize in the filesystem. If we have it set to something less,
831 * then we have horrible problems with trying to piece together
832 * bits of adjacent blocks in order to properly read directory
833 * entries. By forcing the blocksize in this way, we ensure
834 * that we will never be required to do this.
836 sb_set_blocksize(s, orig_zonesize);
838 sbi->s_nls_iocharset = NULL;
841 if (joliet_level && opt.utf8 == 0) {
842 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
843 sbi->s_nls_iocharset = load_nls(p);
844 if (! sbi->s_nls_iocharset) {
845 /* Fail only if explicit charset specified */
848 sbi->s_nls_iocharset = load_nls_default();
852 s->s_op = &isofs_sops;
853 s->s_export_op = &isofs_export_ops;
854 sbi->s_mapping = opt.map;
855 sbi->s_rock = (opt.rock ? 2 : 0);
856 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
857 sbi->s_cruft = opt.cruft;
858 sbi->s_hide = opt.hide;
859 sbi->s_showassoc = opt.showassoc;
860 sbi->s_uid = opt.uid;
861 sbi->s_gid = opt.gid;
862 sbi->s_uid_set = opt.uid_set;
863 sbi->s_gid_set = opt.gid_set;
864 sbi->s_utf8 = opt.utf8;
865 sbi->s_nocompress = opt.nocompress;
866 sbi->s_overriderockperm = opt.overriderockperm;
868 * It would be incredibly stupid to allow people to mark every file
869 * on the disk as suid, so we merely allow them to set the default
872 if (opt.fmode != ISOFS_INVALID_MODE)
873 sbi->s_fmode = opt.fmode & 0777;
875 sbi->s_fmode = ISOFS_INVALID_MODE;
876 if (opt.dmode != ISOFS_INVALID_MODE)
877 sbi->s_dmode = opt.dmode & 0777;
879 sbi->s_dmode = ISOFS_INVALID_MODE;
882 * Read the root inode, which _may_ result in changing
883 * the s_rock flag. Once we have the final s_rock value,
884 * we then decide whether to use the Joliet descriptor.
886 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
891 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
892 * correct Joliet root directory.
894 if (sbi->s_rock == 1 && joliet_level &&
895 rootdir_empty(s, sbi->s_firstdatazone)) {
897 "ISOFS: primary root directory is empty. "
898 "Disabling Rock Ridge and switching to Joliet.");
903 * If this disk has both Rock Ridge and Joliet on it, then we
904 * want to use Rock Ridge by default. This can be overridden
905 * by using the norock mount option. There is still one other
906 * possibility that is not taken into account: a Rock Ridge
907 * CD with Unicode names. Until someone sees such a beast, it
908 * will not be supported.
910 if (sbi->s_rock == 1) {
912 } else if (joliet_level) {
914 if (sbi->s_firstdatazone != first_data_zone) {
915 sbi->s_firstdatazone = first_data_zone;
917 "ISOFS: changing to secondary root\n");
919 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
925 if (opt.check == 'u') {
926 /* Only Joliet is case insensitive by default */
932 sbi->s_joliet_level = joliet_level;
934 /* Make sure the root inode is a directory */
935 if (!S_ISDIR(inode->i_mode)) {
937 "isofs_fill_super: root inode is not a directory. "
938 "Corrupted media?\n");
945 if (opt.check == 'r')
948 s->s_d_op = &isofs_dentry_ops[table];
950 /* get the root dentry */
951 s->s_root = d_make_root(inode);
957 kfree(opt.iocharset);
962 * Display error messages and free resources.
968 error = PTR_ERR(inode);
969 if (error != -ENOMEM)
970 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
973 unload_nls(sbi->s_nls_iocharset);
977 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
978 __func__, s->s_id, iso_blknum, block);
981 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
982 sbi->s_log_zone_size);
985 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
986 orig_zonesize, opt.blocksize);
990 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
996 kfree(opt.iocharset);
1002 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1004 struct super_block *sb = dentry->d_sb;
1005 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1007 buf->f_type = ISOFS_SUPER_MAGIC;
1008 buf->f_bsize = sb->s_blocksize;
1009 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1010 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1013 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1015 buf->f_fsid.val[0] = (u32)id;
1016 buf->f_fsid.val[1] = (u32)(id >> 32);
1017 buf->f_namelen = NAME_MAX;
1022 * Get a set of blocks; filling in buffer_heads if already allocated
1023 * or getblk() if they are not. Returns the number of blocks inserted
1026 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1027 struct buffer_head **bh, unsigned long nblocks)
1029 unsigned long b_off = iblock;
1030 unsigned offset, sect_size;
1031 unsigned int firstext;
1032 unsigned long nextblk, nextoff;
1033 int section, rv, error;
1034 struct iso_inode_info *ei = ISOFS_I(inode);
1038 if (iblock != b_off) {
1039 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1045 firstext = ei->i_first_extent;
1046 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1047 nextblk = ei->i_next_section_block;
1048 nextoff = ei->i_next_section_offset;
1052 /* If we are *way* beyond the end of the file, print a message.
1053 * Access beyond the end of the file up to the next page boundary
1054 * is normal, however because of the way the page cache works.
1055 * In this case, we just return 0 so that we can properly fill
1056 * the page with useless information without generating any
1059 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1060 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1062 (unsigned long long)inode->i_size);
1066 /* On the last section, nextblk == 0, section size is likely to
1067 * exceed sect_size by a partial block, and access beyond the
1068 * end of the file will reach beyond the section size, too.
1070 while (nextblk && (b_off >= (offset + sect_size))) {
1071 struct inode *ninode;
1073 offset += sect_size;
1074 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1075 if (IS_ERR(ninode)) {
1076 error = PTR_ERR(ninode);
1079 firstext = ISOFS_I(ninode)->i_first_extent;
1080 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1081 nextblk = ISOFS_I(ninode)->i_next_section_block;
1082 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1085 if (++section > 100) {
1086 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1087 " aborting...\n", __func__);
1088 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1089 "nextblk=%lu nextoff=%lu\n", __func__,
1090 b_off, firstext, (unsigned) sect_size,
1097 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1099 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1103 bh++; /* Next buffer head */
1104 b_off++; /* Next buffer offset */
1111 return rv != 0 ? rv : error;
1115 * Used by the standard interfaces.
1117 static int isofs_get_block(struct inode *inode, sector_t iblock,
1118 struct buffer_head *bh_result, int create)
1123 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1127 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1128 return ret < 0 ? ret : 0;
1131 static int isofs_bmap(struct inode *inode, sector_t block)
1133 struct buffer_head dummy;
1137 dummy.b_blocknr = -1000;
1138 error = isofs_get_block(inode, block, &dummy, 0);
1140 return dummy.b_blocknr;
1144 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1146 sector_t blknr = isofs_bmap(inode, block);
1149 return sb_bread(inode->i_sb, blknr);
1152 static int isofs_readpage(struct file *file, struct page *page)
1154 return mpage_readpage(page, isofs_get_block);
1157 static int isofs_readpages(struct file *file, struct address_space *mapping,
1158 struct list_head *pages, unsigned nr_pages)
1160 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1163 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1165 return generic_block_bmap(mapping,block,isofs_get_block);
1168 static const struct address_space_operations isofs_aops = {
1169 .readpage = isofs_readpage,
1170 .readpages = isofs_readpages,
1174 static int isofs_read_level3_size(struct inode *inode)
1176 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1177 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1178 struct buffer_head *bh = NULL;
1179 unsigned long block, offset, block_saved, offset_saved;
1181 int more_entries = 0;
1182 struct iso_directory_record *tmpde = NULL;
1183 struct iso_inode_info *ei = ISOFS_I(inode);
1187 /* The first 16 blocks are reserved as the System Area. Thus,
1188 * no inodes can appear in block 0. We use this to flag that
1189 * this is the last section. */
1190 ei->i_next_section_block = 0;
1191 ei->i_next_section_offset = 0;
1193 block = ei->i_iget5_block;
1194 offset = ei->i_iget5_offset;
1197 struct iso_directory_record *de;
1198 unsigned int de_len;
1201 bh = sb_bread(inode->i_sb, block);
1205 de = (struct iso_directory_record *) (bh->b_data + offset);
1206 de_len = *(unsigned char *) de;
1216 block_saved = block;
1217 offset_saved = offset;
1220 /* Make sure we have a full directory entry */
1221 if (offset >= bufsize) {
1222 int slop = bufsize - offset + de_len;
1224 tmpde = kmalloc(256, GFP_KERNEL);
1228 memcpy(tmpde, de, slop);
1229 offset &= bufsize - 1;
1234 bh = sb_bread(inode->i_sb, block);
1237 memcpy((void *)tmpde+slop, bh->b_data, offset);
1242 inode->i_size += isonum_733(de->size);
1244 ei->i_next_section_block = block_saved;
1245 ei->i_next_section_offset = offset_saved;
1248 more_entries = de->flags[-high_sierra] & 0x80;
1253 } while (more_entries);
1266 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1271 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1272 "isofs_read_level3_size: inode=%lu\n",
1273 __func__, inode->i_ino);
1277 static int isofs_read_inode(struct inode *inode)
1279 struct super_block *sb = inode->i_sb;
1280 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1281 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1282 unsigned long block;
1283 int high_sierra = sbi->s_high_sierra;
1284 struct buffer_head *bh = NULL;
1285 struct iso_directory_record *de;
1286 struct iso_directory_record *tmpde = NULL;
1287 unsigned int de_len;
1288 unsigned long offset;
1289 struct iso_inode_info *ei = ISOFS_I(inode);
1292 block = ei->i_iget5_block;
1293 bh = sb_bread(inode->i_sb, block);
1297 offset = ei->i_iget5_offset;
1299 de = (struct iso_directory_record *) (bh->b_data + offset);
1300 de_len = *(unsigned char *) de;
1302 if (offset + de_len > bufsize) {
1303 int frag1 = bufsize - offset;
1305 tmpde = kmalloc(de_len, GFP_KERNEL);
1306 if (tmpde == NULL) {
1307 printk(KERN_INFO "%s: out of memory\n", __func__);
1311 memcpy(tmpde, bh->b_data + offset, frag1);
1313 bh = sb_bread(inode->i_sb, ++block);
1316 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1320 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1322 ISOFS_BUFFER_BITS(inode));
1324 /* Assume it is a normal-format file unless told otherwise */
1325 ei->i_file_format = isofs_file_normal;
1327 if (de->flags[-high_sierra] & 2) {
1328 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1329 inode->i_mode = S_IFDIR | sbi->s_dmode;
1331 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1332 set_nlink(inode, 1); /*
1333 * Set to 1. We know there are 2, but
1334 * the find utility tries to optimize
1335 * if it is 2, and it screws up. It is
1336 * easier to give 1 which tells find to
1337 * do it the hard way.
1340 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1341 inode->i_mode = S_IFREG | sbi->s_fmode;
1344 * Set default permissions: r-x for all. The disc
1345 * could be shared with DOS machines so virtually
1346 * anything could be a valid executable.
1348 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1350 set_nlink(inode, 1);
1352 inode->i_uid = sbi->s_uid;
1353 inode->i_gid = sbi->s_gid;
1354 inode->i_blocks = 0;
1356 ei->i_format_parm[0] = 0;
1357 ei->i_format_parm[1] = 0;
1358 ei->i_format_parm[2] = 0;
1360 ei->i_section_size = isonum_733(de->size);
1361 if (de->flags[-high_sierra] & 0x80) {
1362 ret = isofs_read_level3_size(inode);
1367 ei->i_next_section_block = 0;
1368 ei->i_next_section_offset = 0;
1369 inode->i_size = isonum_733(de->size);
1373 * Some dipshit decided to store some other bit of information
1374 * in the high byte of the file length. Truncate size in case
1375 * this CDROM was mounted with the cruft option.
1379 inode->i_size &= 0x00ffffff;
1381 if (de->interleave[0]) {
1382 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1386 /* I have no idea what file_unit_size is used for, so
1387 we will flag it for now */
1388 if (de->file_unit_size[0] != 0) {
1389 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1393 /* I have no idea what other flag bits are used for, so
1394 we will flag it for now */
1396 if((de->flags[-high_sierra] & ~2)!= 0){
1397 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1399 inode->i_ino, de->flags[-high_sierra]);
1403 inode->i_mtime.tv_sec =
1404 inode->i_atime.tv_sec =
1405 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1406 inode->i_mtime.tv_nsec =
1407 inode->i_atime.tv_nsec =
1408 inode->i_ctime.tv_nsec = 0;
1410 ei->i_first_extent = (isonum_733(de->extent) +
1411 isonum_711(de->ext_attr_length));
1413 /* Set the number of blocks for stat() - should be done before RR */
1414 inode->i_blocks = (inode->i_size + 511) >> 9;
1417 * Now test for possible Rock Ridge extensions which will override
1418 * some of these numbers in the inode structure.
1422 parse_rock_ridge_inode(de, inode);
1423 /* if we want uid/gid set, override the rock ridge setting */
1425 inode->i_uid = sbi->s_uid;
1427 inode->i_gid = sbi->s_gid;
1429 /* Now set final access rights if overriding rock ridge setting */
1430 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1431 sbi->s_dmode != ISOFS_INVALID_MODE)
1432 inode->i_mode = S_IFDIR | sbi->s_dmode;
1433 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1434 sbi->s_fmode != ISOFS_INVALID_MODE)
1435 inode->i_mode = S_IFREG | sbi->s_fmode;
1437 /* Install the inode operations vector */
1438 if (S_ISREG(inode->i_mode)) {
1439 inode->i_fop = &generic_ro_fops;
1440 switch (ei->i_file_format) {
1441 #ifdef CONFIG_ZISOFS
1442 case isofs_file_compressed:
1443 inode->i_data.a_ops = &zisofs_aops;
1447 inode->i_data.a_ops = &isofs_aops;
1450 } else if (S_ISDIR(inode->i_mode)) {
1451 inode->i_op = &isofs_dir_inode_operations;
1452 inode->i_fop = &isofs_dir_operations;
1453 } else if (S_ISLNK(inode->i_mode)) {
1454 inode->i_op = &page_symlink_inode_operations;
1455 inode->i_data.a_ops = &isofs_symlink_aops;
1457 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1458 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1468 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1473 struct isofs_iget5_callback_data {
1474 unsigned long block;
1475 unsigned long offset;
1478 static int isofs_iget5_test(struct inode *ino, void *data)
1480 struct iso_inode_info *i = ISOFS_I(ino);
1481 struct isofs_iget5_callback_data *d =
1482 (struct isofs_iget5_callback_data*)data;
1483 return (i->i_iget5_block == d->block)
1484 && (i->i_iget5_offset == d->offset);
1487 static int isofs_iget5_set(struct inode *ino, void *data)
1489 struct iso_inode_info *i = ISOFS_I(ino);
1490 struct isofs_iget5_callback_data *d =
1491 (struct isofs_iget5_callback_data*)data;
1492 i->i_iget5_block = d->block;
1493 i->i_iget5_offset = d->offset;
1497 /* Store, in the inode's containing structure, the block and block
1498 * offset that point to the underlying meta-data for the inode. The
1499 * code below is otherwise similar to the iget() code in
1500 * include/linux/fs.h */
1501 struct inode *isofs_iget(struct super_block *sb,
1502 unsigned long block,
1503 unsigned long offset)
1505 unsigned long hashval;
1506 struct inode *inode;
1507 struct isofs_iget5_callback_data data;
1510 if (offset >= 1ul << sb->s_blocksize_bits)
1511 return ERR_PTR(-EINVAL);
1514 data.offset = offset;
1516 hashval = (block << sb->s_blocksize_bits) | offset;
1518 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1519 &isofs_iget5_set, &data);
1522 return ERR_PTR(-ENOMEM);
1524 if (inode->i_state & I_NEW) {
1525 ret = isofs_read_inode(inode);
1528 inode = ERR_PTR(ret);
1530 unlock_new_inode(inode);
1537 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1538 int flags, const char *dev_name, void *data)
1540 /* We don't support read-write mounts */
1541 if (!(flags & MS_RDONLY))
1542 return ERR_PTR(-EACCES);
1543 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1546 static struct file_system_type iso9660_fs_type = {
1547 .owner = THIS_MODULE,
1549 .mount = isofs_mount,
1550 .kill_sb = kill_block_super,
1551 .fs_flags = FS_REQUIRES_DEV,
1553 MODULE_ALIAS_FS("iso9660");
1554 MODULE_ALIAS("iso9660");
1556 static int __init init_iso9660_fs(void)
1558 int err = init_inodecache();
1561 #ifdef CONFIG_ZISOFS
1562 err = zisofs_init();
1566 err = register_filesystem(&iso9660_fs_type);
1571 #ifdef CONFIG_ZISOFS
1575 destroy_inodecache();
1580 static void __exit exit_iso9660_fs(void)
1582 unregister_filesystem(&iso9660_fs_type);
1583 #ifdef CONFIG_ZISOFS
1586 destroy_inodecache();
1589 module_init(init_iso9660_fs)
1590 module_exit(exit_iso9660_fs)
1591 MODULE_LICENSE("GPL");