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/cred.h>
19 #include <linux/nls.h>
20 #include <linux/ctype.h>
21 #include <linux/statfs.h>
22 #include <linux/cdrom.h>
23 #include <linux/parser.h>
24 #include <linux/mpage.h>
25 #include <linux/user_namespace.h>
26 #include <linux/seq_file.h>
27 #include <linux/blkdev.h>
34 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
35 static int isofs_dentry_cmpi(const struct dentry *dentry,
36 unsigned int len, const char *str, const struct qstr *name);
39 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
40 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
41 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
42 unsigned int len, const char *str, const struct qstr *name);
43 static int isofs_dentry_cmp_ms(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 *);
62 static int isofs_show_options(struct seq_file *, struct dentry *);
64 static struct kmem_cache *isofs_inode_cachep;
66 static struct inode *isofs_alloc_inode(struct super_block *sb)
68 struct iso_inode_info *ei;
69 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
72 return &ei->vfs_inode;
75 static void isofs_i_callback(struct rcu_head *head)
77 struct inode *inode = container_of(head, struct inode, i_rcu);
78 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
81 static void isofs_destroy_inode(struct inode *inode)
83 call_rcu(&inode->i_rcu, isofs_i_callback);
86 static void init_once(void *foo)
88 struct iso_inode_info *ei = foo;
90 inode_init_once(&ei->vfs_inode);
93 static int __init init_inodecache(void)
95 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
96 sizeof(struct iso_inode_info),
97 0, (SLAB_RECLAIM_ACCOUNT|
98 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
100 if (!isofs_inode_cachep)
105 static void destroy_inodecache(void)
108 * Make sure all delayed rcu free inodes are flushed before we
112 kmem_cache_destroy(isofs_inode_cachep);
115 static int isofs_remount(struct super_block *sb, int *flags, char *data)
118 if (!(*flags & SB_RDONLY))
123 static const struct super_operations isofs_sops = {
124 .alloc_inode = isofs_alloc_inode,
125 .destroy_inode = isofs_destroy_inode,
126 .put_super = isofs_put_super,
127 .statfs = isofs_statfs,
128 .remount_fs = isofs_remount,
129 .show_options = isofs_show_options,
133 static const struct dentry_operations isofs_dentry_ops[] = {
135 .d_hash = isofs_hashi,
136 .d_compare = isofs_dentry_cmpi,
140 .d_hash = isofs_hash_ms,
141 .d_compare = isofs_dentry_cmp_ms,
144 .d_hash = isofs_hashi_ms,
145 .d_compare = isofs_dentry_cmpi_ms,
150 struct iso9660_options{
152 unsigned int joliet:1;
153 unsigned int cruft:1;
155 unsigned int showassoc:1;
156 unsigned int nocompress:1;
157 unsigned int overriderockperm:1;
158 unsigned int uid_set:1;
159 unsigned int gid_set:1;
163 unsigned int blocksize;
175 * Compute the hash for the isofs name corresponding to the dentry.
178 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
188 while (len && name[len-1] == '.')
192 hash = init_name_hash(dentry);
194 c = tolower(*name++);
195 hash = partial_name_hash(c, hash);
197 qstr->hash = end_name_hash(hash);
203 * Compare of two isofs names.
205 static int isofs_dentry_cmp_common(
206 unsigned int len, const char *str,
207 const struct qstr *name, int ms, int ci)
211 /* A filename cannot end in '.' or we treat it like it has none */
215 while (alen && name->name[alen-1] == '.')
217 while (blen && str[blen-1] == '.')
222 if (strncasecmp(name->name, str, alen) == 0)
225 if (strncmp(name->name, str, alen) == 0)
233 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
235 return isofs_hashi_common(dentry, qstr, 0);
239 isofs_dentry_cmpi(const struct dentry *dentry,
240 unsigned int len, const char *str, const struct qstr *name)
242 return isofs_dentry_cmp_common(len, str, name, 0, 1);
247 * Compute the hash for the isofs name corresponding to the dentry.
250 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
258 while (len && name[len-1] == '.')
262 qstr->hash = full_name_hash(dentry, name, len);
268 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
270 return isofs_hash_common(dentry, qstr, 1);
274 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
276 return isofs_hashi_common(dentry, qstr, 1);
280 isofs_dentry_cmp_ms(const struct dentry *dentry,
281 unsigned int len, const char *str, const struct qstr *name)
283 return isofs_dentry_cmp_common(len, str, name, 1, 0);
287 isofs_dentry_cmpi_ms(const struct dentry *dentry,
288 unsigned int len, const char *str, const struct qstr *name)
290 return isofs_dentry_cmp_common(len, str, name, 1, 1);
295 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
296 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
297 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
298 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
301 static const match_table_t tokens = {
302 {Opt_norock, "norock"},
303 {Opt_nojoliet, "nojoliet"},
304 {Opt_unhide, "unhide"},
306 {Opt_showassoc, "showassoc"},
307 {Opt_cruft, "cruft"},
309 {Opt_iocharset, "iocharset=%s"},
310 {Opt_map_a, "map=acorn"},
311 {Opt_map_a, "map=a"},
312 {Opt_map_n, "map=normal"},
313 {Opt_map_n, "map=n"},
314 {Opt_map_o, "map=off"},
315 {Opt_map_o, "map=o"},
316 {Opt_session, "session=%u"},
317 {Opt_sb, "sbsector=%u"},
318 {Opt_check_r, "check=relaxed"},
319 {Opt_check_r, "check=r"},
320 {Opt_check_s, "check=strict"},
321 {Opt_check_s, "check=s"},
324 {Opt_mode, "mode=%u"},
325 {Opt_dmode, "dmode=%u"},
326 {Opt_overriderockperm, "overriderockperm"},
327 {Opt_block, "block=%u"},
328 {Opt_ignore, "conv=binary"},
329 {Opt_ignore, "conv=b"},
330 {Opt_ignore, "conv=text"},
331 {Opt_ignore, "conv=t"},
332 {Opt_ignore, "conv=mtext"},
333 {Opt_ignore, "conv=m"},
334 {Opt_ignore, "conv=auto"},
335 {Opt_ignore, "conv=a"},
336 {Opt_nocompress, "nocompress"},
340 static int parse_options(char *options, struct iso9660_options *popt)
351 popt->check = 'u'; /* unset */
352 popt->nocompress = 0;
353 popt->blocksize = 1024;
354 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
357 popt->gid = GLOBAL_ROOT_GID;
358 popt->uid = GLOBAL_ROOT_UID;
359 popt->iocharset = NULL;
361 popt->overriderockperm = 0;
367 while ((p = strsep(&options, ",")) != NULL) {
369 substring_t args[MAX_OPT_ARGS];
375 token = match_token(p, tokens, args);
398 kfree(popt->iocharset);
399 popt->iocharset = match_strdup(&args[0]);
400 if (!popt->iocharset)
414 if (match_int(&args[0], &option))
418 * Track numbers are supposed to be in range 1-99, the
419 * mount option starts indexing at 0.
423 popt->session = n + 1;
426 if (match_int(&args[0], &option))
428 popt->sbsector = option;
439 if (match_int(&args[0], &option))
441 popt->uid = make_kuid(current_user_ns(), option);
442 if (!uid_valid(popt->uid))
447 if (match_int(&args[0], &option))
449 popt->gid = make_kgid(current_user_ns(), option);
450 if (!gid_valid(popt->gid))
455 if (match_int(&args[0], &option))
457 popt->fmode = option;
460 if (match_int(&args[0], &option))
462 popt->dmode = option;
464 case Opt_overriderockperm:
465 popt->overriderockperm = 1;
468 if (match_int(&args[0], &option))
471 if (n != 512 && n != 1024 && n != 2048)
476 popt->nocompress = 1;
486 * Display the mount options in /proc/mounts.
488 static int isofs_show_options(struct seq_file *m, struct dentry *root)
490 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
492 if (!sbi->s_rock) seq_puts(m, ",norock");
493 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
494 if (sbi->s_cruft) seq_puts(m, ",cruft");
495 if (sbi->s_hide) seq_puts(m, ",hide");
496 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
497 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
498 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
499 if (sbi->s_utf8) seq_puts(m, ",utf8");
501 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
502 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
503 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
504 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
506 if (root->d_sb->s_blocksize != 1024)
507 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
510 seq_printf(m, ",uid=%u",
511 from_kuid_munged(&init_user_ns, sbi->s_uid));
513 seq_printf(m, ",gid=%u",
514 from_kgid_munged(&init_user_ns, sbi->s_gid));
516 if (sbi->s_dmode != ISOFS_INVALID_MODE)
517 seq_printf(m, ",dmode=%o", sbi->s_dmode);
518 if (sbi->s_fmode != ISOFS_INVALID_MODE)
519 seq_printf(m, ",fmode=%o", sbi->s_fmode);
522 if (sbi->s_nls_iocharset &&
523 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
524 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
530 * look if the driver can tell the multi session redirection value
532 * don't change this if you don't know what you do, please!
533 * Multisession is legal only with XA disks.
534 * A non-XA disk with more than one volume descriptor may do it right, but
535 * usually is written in a nowhere standardized "multi-partition" manner.
536 * Multisession uses absolute addressing (solely the first frame of the whole
537 * track is #0), multi-partition uses relative addressing (each first frame of
538 * each track is #0), and a track is not a session.
540 * A broken CDwriter software or drive firmware does not set new standards,
541 * at least not if conflicting with the existing ones.
545 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
547 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
549 struct cdrom_multisession ms_info;
550 unsigned int vol_desc_start;
551 struct block_device *bdev = sb->s_bdev;
555 ms_info.addr_format=CDROM_LBA;
557 struct cdrom_tocentry Te;
558 Te.cdte_track=session;
559 Te.cdte_format=CDROM_LBA;
560 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
562 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
563 session, Te.cdte_addr.lba,
564 Te.cdte_ctrl&CDROM_DATA_TRACK);
565 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
566 return Te.cdte_addr.lba;
569 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
571 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
573 printk(KERN_ERR "ISOFS: Invalid session number\n");
575 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
577 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
578 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
582 #if WE_OBEY_THE_WRITTEN_STANDARDS
583 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
585 vol_desc_start=ms_info.addr.lba;
586 return vol_desc_start;
590 * Check if root directory is empty (has less than 3 files).
592 * Used to detect broken CDs where ISO root directory is empty but Joliet root
593 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
594 * (and Joliet used instead) or else no files would be visible.
596 static bool rootdir_empty(struct super_block *sb, unsigned long block)
598 int offset = 0, files = 0, de_len;
599 struct iso_directory_record *de;
600 struct buffer_head *bh;
602 bh = sb_bread(sb, block);
606 de = (struct iso_directory_record *) (bh->b_data + offset);
607 de_len = *(unsigned char *) de;
618 * Initialize the superblock and read the root inode.
620 * Note: a check_disk_change() has been done immediately prior
621 * to this call, so we don't need to check again.
623 static int isofs_fill_super(struct super_block *s, void *data, int silent)
625 struct buffer_head *bh = NULL, *pri_bh = NULL;
626 struct hs_primary_descriptor *h_pri = NULL;
627 struct iso_primary_descriptor *pri = NULL;
628 struct iso_supplementary_descriptor *sec = NULL;
629 struct iso_directory_record *rootp;
631 struct iso9660_options opt;
632 struct isofs_sb_info *sbi;
633 unsigned long first_data_zone;
634 int joliet_level = 0;
635 int iso_blknum, block;
637 int table, error = -EINVAL;
638 unsigned int vol_desc_start;
640 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
645 if (!parse_options((char *)data, &opt))
649 * First of all, get the hardware blocksize for this device.
650 * If we don't know what it is, or the hardware blocksize is
651 * larger than the blocksize the user specified, then use
655 * What if bugger tells us to go beyond page size?
657 if (bdev_logical_block_size(s->s_bdev) > 2048) {
659 "ISOFS: unsupported/invalid hardware sector size %d\n",
660 bdev_logical_block_size(s->s_bdev));
663 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
665 sbi->s_high_sierra = 0; /* default is iso9660 */
666 sbi->s_session = opt.session;
667 sbi->s_sbsector = opt.sbsector;
669 vol_desc_start = (opt.sbsector != -1) ?
670 opt.sbsector : isofs_get_last_session(s,opt.session);
672 for (iso_blknum = vol_desc_start+16;
673 iso_blknum < vol_desc_start+100; iso_blknum++) {
674 struct hs_volume_descriptor *hdp;
675 struct iso_volume_descriptor *vdp;
677 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
678 if (!(bh = sb_bread(s, block)))
681 vdp = (struct iso_volume_descriptor *)bh->b_data;
682 hdp = (struct hs_volume_descriptor *)bh->b_data;
685 * Due to the overlapping physical location of the descriptors,
686 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
687 * proper identification in this case, we first check for ISO.
689 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
690 if (isonum_711(vdp->type) == ISO_VD_END)
692 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
694 pri = (struct iso_primary_descriptor *)vdp;
695 /* Save the buffer in case we need it ... */
701 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
702 sec = (struct iso_supplementary_descriptor *)vdp;
703 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
705 if (sec->escape[2] == 0x40)
707 else if (sec->escape[2] == 0x43)
709 else if (sec->escape[2] == 0x45)
712 printk(KERN_DEBUG "ISO 9660 Extensions: "
713 "Microsoft Joliet Level %d\n",
718 /* Unknown supplementary volume descriptor */
724 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
725 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
728 sbi->s_high_sierra = 1;
730 h_pri = (struct hs_primary_descriptor *)vdp;
735 /* Just skip any volume descriptors we don't recognize */
741 * If we fall through, either no volume descriptor was found,
742 * or else we passed a primary descriptor looking for others.
745 goto out_unknown_format;
751 /* We don't support read-write mounts */
757 if (joliet_level && (!pri || !opt.rock)) {
758 /* This is the case of Joliet with the norock mount flag.
759 * A disc with both Joliet and Rock Ridge is handled later
761 pri = (struct iso_primary_descriptor *) sec;
764 if(sbi->s_high_sierra){
765 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
766 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
767 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
768 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
772 rootp = (struct iso_directory_record *) pri->root_directory_record;
773 sbi->s_nzones = isonum_733(pri->volume_space_size);
774 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
775 sbi->s_max_size = isonum_733(pri->volume_space_size);
778 sbi->s_ninodes = 0; /* No way to figure this out easily */
780 orig_zonesize = sbi->s_log_zone_size;
782 * If the zone size is smaller than the hardware sector size,
783 * this is a fatal error. This would occur if the disc drive
784 * had sectors that were 2048 bytes, but the filesystem had
785 * blocks that were 512 bytes (which should only very rarely
788 if (orig_zonesize < opt.blocksize)
791 /* RDE: convert log zone size to bit shift */
792 switch (sbi->s_log_zone_size) {
793 case 512: sbi->s_log_zone_size = 9; break;
794 case 1024: sbi->s_log_zone_size = 10; break;
795 case 2048: sbi->s_log_zone_size = 11; break;
798 goto out_bad_zone_size;
801 s->s_magic = ISOFS_SUPER_MAGIC;
804 * With multi-extent files, file size is only limited by the maximum
805 * size of a file system, which is 8 TB.
807 s->s_maxbytes = 0x80000000000LL;
809 /* Set this for reference. Its not currently used except on write
810 which we don't have .. */
812 first_data_zone = isonum_733(rootp->extent) +
813 isonum_711(rootp->ext_attr_length);
814 sbi->s_firstdatazone = first_data_zone;
816 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
817 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
818 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
819 if(sbi->s_high_sierra)
820 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
824 * If the Joliet level is set, we _may_ decide to use the
825 * secondary descriptor, but can't be sure until after we
826 * read the root inode. But before reading the root inode
827 * we may need to change the device blocksize, and would
828 * rather release the old buffer first. So, we cache the
829 * first_data_zone value from the secondary descriptor.
832 pri = (struct iso_primary_descriptor *) sec;
833 rootp = (struct iso_directory_record *)
834 pri->root_directory_record;
835 first_data_zone = isonum_733(rootp->extent) +
836 isonum_711(rootp->ext_attr_length);
840 * We're all done using the volume descriptor, and may need
841 * to change the device blocksize, so release the buffer now.
847 * Force the blocksize to 512 for 512 byte sectors. The file
848 * read primitives really get it wrong in a bad way if we don't
851 * Note - we should never be setting the blocksize to something
852 * less than the hardware sector size for the device. If we
853 * do, we would end up having to read larger buffers and split
854 * out portions to satisfy requests.
856 * Note2- the idea here is that we want to deal with the optimal
857 * zonesize in the filesystem. If we have it set to something less,
858 * then we have horrible problems with trying to piece together
859 * bits of adjacent blocks in order to properly read directory
860 * entries. By forcing the blocksize in this way, we ensure
861 * that we will never be required to do this.
863 sb_set_blocksize(s, orig_zonesize);
865 sbi->s_nls_iocharset = NULL;
868 if (joliet_level && opt.utf8 == 0) {
869 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
870 sbi->s_nls_iocharset = load_nls(p);
871 if (! sbi->s_nls_iocharset) {
872 /* Fail only if explicit charset specified */
875 sbi->s_nls_iocharset = load_nls_default();
879 s->s_op = &isofs_sops;
880 s->s_export_op = &isofs_export_ops;
881 sbi->s_mapping = opt.map;
882 sbi->s_rock = (opt.rock ? 2 : 0);
883 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
884 sbi->s_cruft = opt.cruft;
885 sbi->s_hide = opt.hide;
886 sbi->s_showassoc = opt.showassoc;
887 sbi->s_uid = opt.uid;
888 sbi->s_gid = opt.gid;
889 sbi->s_uid_set = opt.uid_set;
890 sbi->s_gid_set = opt.gid_set;
891 sbi->s_utf8 = opt.utf8;
892 sbi->s_nocompress = opt.nocompress;
893 sbi->s_overriderockperm = opt.overriderockperm;
895 * It would be incredibly stupid to allow people to mark every file
896 * on the disk as suid, so we merely allow them to set the default
899 if (opt.fmode != ISOFS_INVALID_MODE)
900 sbi->s_fmode = opt.fmode & 0777;
902 sbi->s_fmode = ISOFS_INVALID_MODE;
903 if (opt.dmode != ISOFS_INVALID_MODE)
904 sbi->s_dmode = opt.dmode & 0777;
906 sbi->s_dmode = ISOFS_INVALID_MODE;
909 * Read the root inode, which _may_ result in changing
910 * the s_rock flag. Once we have the final s_rock value,
911 * we then decide whether to use the Joliet descriptor.
913 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
918 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
919 * correct Joliet root directory.
921 if (sbi->s_rock == 1 && joliet_level &&
922 rootdir_empty(s, sbi->s_firstdatazone)) {
924 "ISOFS: primary root directory is empty. "
925 "Disabling Rock Ridge and switching to Joliet.");
930 * If this disk has both Rock Ridge and Joliet on it, then we
931 * want to use Rock Ridge by default. This can be overridden
932 * by using the norock mount option. There is still one other
933 * possibility that is not taken into account: a Rock Ridge
934 * CD with Unicode names. Until someone sees such a beast, it
935 * will not be supported.
937 if (sbi->s_rock == 1) {
939 } else if (joliet_level) {
941 if (sbi->s_firstdatazone != first_data_zone) {
942 sbi->s_firstdatazone = first_data_zone;
944 "ISOFS: changing to secondary root\n");
946 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
952 if (opt.check == 'u') {
953 /* Only Joliet is case insensitive by default */
959 sbi->s_joliet_level = joliet_level;
961 /* Make sure the root inode is a directory */
962 if (!S_ISDIR(inode->i_mode)) {
964 "isofs_fill_super: root inode is not a directory. "
965 "Corrupted media?\n");
972 if (opt.check == 'r')
974 sbi->s_check = opt.check;
977 s->s_d_op = &isofs_dentry_ops[table - 1];
979 /* get the root dentry */
980 s->s_root = d_make_root(inode);
986 kfree(opt.iocharset);
991 * Display error messages and free resources.
997 error = PTR_ERR(inode);
998 if (error != -ENOMEM)
999 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
1001 #ifdef CONFIG_JOLIET
1002 unload_nls(sbi->s_nls_iocharset);
1006 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1007 __func__, s->s_id, iso_blknum, block);
1010 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1011 sbi->s_log_zone_size);
1014 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1015 orig_zonesize, opt.blocksize);
1019 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1025 kfree(opt.iocharset);
1027 s->s_fs_info = NULL;
1031 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1033 struct super_block *sb = dentry->d_sb;
1034 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1036 buf->f_type = ISOFS_SUPER_MAGIC;
1037 buf->f_bsize = sb->s_blocksize;
1038 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1039 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1042 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1044 buf->f_fsid.val[0] = (u32)id;
1045 buf->f_fsid.val[1] = (u32)(id >> 32);
1046 buf->f_namelen = NAME_MAX;
1051 * Get a set of blocks; filling in buffer_heads if already allocated
1052 * or getblk() if they are not. Returns the number of blocks inserted
1055 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1056 struct buffer_head **bh, unsigned long nblocks)
1058 unsigned long b_off = iblock;
1059 unsigned offset, sect_size;
1060 unsigned int firstext;
1061 unsigned long nextblk, nextoff;
1062 int section, rv, error;
1063 struct iso_inode_info *ei = ISOFS_I(inode);
1067 if (iblock != b_off) {
1068 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1074 firstext = ei->i_first_extent;
1075 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1076 nextblk = ei->i_next_section_block;
1077 nextoff = ei->i_next_section_offset;
1081 /* If we are *way* beyond the end of the file, print a message.
1082 * Access beyond the end of the file up to the next page boundary
1083 * is normal, however because of the way the page cache works.
1084 * In this case, we just return 0 so that we can properly fill
1085 * the page with useless information without generating any
1088 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1089 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1091 (unsigned long long)inode->i_size);
1095 /* On the last section, nextblk == 0, section size is likely to
1096 * exceed sect_size by a partial block, and access beyond the
1097 * end of the file will reach beyond the section size, too.
1099 while (nextblk && (b_off >= (offset + sect_size))) {
1100 struct inode *ninode;
1102 offset += sect_size;
1103 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1104 if (IS_ERR(ninode)) {
1105 error = PTR_ERR(ninode);
1108 firstext = ISOFS_I(ninode)->i_first_extent;
1109 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1110 nextblk = ISOFS_I(ninode)->i_next_section_block;
1111 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1114 if (++section > 100) {
1115 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1116 " aborting...\n", __func__);
1117 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1118 "nextblk=%lu nextoff=%lu\n", __func__,
1119 b_off, firstext, (unsigned) sect_size,
1126 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1128 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1132 bh++; /* Next buffer head */
1133 b_off++; /* Next buffer offset */
1140 return rv != 0 ? rv : error;
1144 * Used by the standard interfaces.
1146 static int isofs_get_block(struct inode *inode, sector_t iblock,
1147 struct buffer_head *bh_result, int create)
1152 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1156 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1157 return ret < 0 ? ret : 0;
1160 static int isofs_bmap(struct inode *inode, sector_t block)
1162 struct buffer_head dummy;
1166 dummy.b_blocknr = -1000;
1167 error = isofs_get_block(inode, block, &dummy, 0);
1169 return dummy.b_blocknr;
1173 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1175 sector_t blknr = isofs_bmap(inode, block);
1178 return sb_bread(inode->i_sb, blknr);
1181 static int isofs_readpage(struct file *file, struct page *page)
1183 return mpage_readpage(page, isofs_get_block);
1186 static int isofs_readpages(struct file *file, struct address_space *mapping,
1187 struct list_head *pages, unsigned nr_pages)
1189 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1192 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1194 return generic_block_bmap(mapping,block,isofs_get_block);
1197 static const struct address_space_operations isofs_aops = {
1198 .readpage = isofs_readpage,
1199 .readpages = isofs_readpages,
1203 static int isofs_read_level3_size(struct inode *inode)
1205 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1206 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1207 struct buffer_head *bh = NULL;
1208 unsigned long block, offset, block_saved, offset_saved;
1210 int more_entries = 0;
1211 struct iso_directory_record *tmpde = NULL;
1212 struct iso_inode_info *ei = ISOFS_I(inode);
1216 /* The first 16 blocks are reserved as the System Area. Thus,
1217 * no inodes can appear in block 0. We use this to flag that
1218 * this is the last section. */
1219 ei->i_next_section_block = 0;
1220 ei->i_next_section_offset = 0;
1222 block = ei->i_iget5_block;
1223 offset = ei->i_iget5_offset;
1226 struct iso_directory_record *de;
1227 unsigned int de_len;
1230 bh = sb_bread(inode->i_sb, block);
1234 de = (struct iso_directory_record *) (bh->b_data + offset);
1235 de_len = *(unsigned char *) de;
1245 block_saved = block;
1246 offset_saved = offset;
1249 /* Make sure we have a full directory entry */
1250 if (offset >= bufsize) {
1251 int slop = bufsize - offset + de_len;
1253 tmpde = kmalloc(256, GFP_KERNEL);
1257 memcpy(tmpde, de, slop);
1258 offset &= bufsize - 1;
1263 bh = sb_bread(inode->i_sb, block);
1266 memcpy((void *)tmpde+slop, bh->b_data, offset);
1271 inode->i_size += isonum_733(de->size);
1273 ei->i_next_section_block = block_saved;
1274 ei->i_next_section_offset = offset_saved;
1277 more_entries = de->flags[-high_sierra] & 0x80;
1282 } while (more_entries);
1295 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1300 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1301 "isofs_read_level3_size: inode=%lu\n",
1302 __func__, inode->i_ino);
1306 static int isofs_read_inode(struct inode *inode, int relocated)
1308 struct super_block *sb = inode->i_sb;
1309 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1310 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1311 unsigned long block;
1312 int high_sierra = sbi->s_high_sierra;
1313 struct buffer_head *bh;
1314 struct iso_directory_record *de;
1315 struct iso_directory_record *tmpde = NULL;
1316 unsigned int de_len;
1317 unsigned long offset;
1318 struct iso_inode_info *ei = ISOFS_I(inode);
1321 block = ei->i_iget5_block;
1322 bh = sb_bread(inode->i_sb, block);
1326 offset = ei->i_iget5_offset;
1328 de = (struct iso_directory_record *) (bh->b_data + offset);
1329 de_len = *(unsigned char *) de;
1331 if (offset + de_len > bufsize) {
1332 int frag1 = bufsize - offset;
1334 tmpde = kmalloc(de_len, GFP_KERNEL);
1339 memcpy(tmpde, bh->b_data + offset, frag1);
1341 bh = sb_bread(inode->i_sb, ++block);
1344 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1348 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1350 ISOFS_BUFFER_BITS(inode));
1352 /* Assume it is a normal-format file unless told otherwise */
1353 ei->i_file_format = isofs_file_normal;
1355 if (de->flags[-high_sierra] & 2) {
1356 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1357 inode->i_mode = S_IFDIR | sbi->s_dmode;
1359 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1360 set_nlink(inode, 1); /*
1361 * Set to 1. We know there are 2, but
1362 * the find utility tries to optimize
1363 * if it is 2, and it screws up. It is
1364 * easier to give 1 which tells find to
1365 * do it the hard way.
1368 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1369 inode->i_mode = S_IFREG | sbi->s_fmode;
1372 * Set default permissions: r-x for all. The disc
1373 * could be shared with DOS machines so virtually
1374 * anything could be a valid executable.
1376 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1378 set_nlink(inode, 1);
1380 inode->i_uid = sbi->s_uid;
1381 inode->i_gid = sbi->s_gid;
1382 inode->i_blocks = 0;
1384 ei->i_format_parm[0] = 0;
1385 ei->i_format_parm[1] = 0;
1386 ei->i_format_parm[2] = 0;
1388 ei->i_section_size = isonum_733(de->size);
1389 if (de->flags[-high_sierra] & 0x80) {
1390 ret = isofs_read_level3_size(inode);
1395 ei->i_next_section_block = 0;
1396 ei->i_next_section_offset = 0;
1397 inode->i_size = isonum_733(de->size);
1401 * Some dipshit decided to store some other bit of information
1402 * in the high byte of the file length. Truncate size in case
1403 * this CDROM was mounted with the cruft option.
1407 inode->i_size &= 0x00ffffff;
1409 if (de->interleave[0]) {
1410 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1414 /* I have no idea what file_unit_size is used for, so
1415 we will flag it for now */
1416 if (de->file_unit_size[0] != 0) {
1417 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1421 /* I have no idea what other flag bits are used for, so
1422 we will flag it for now */
1424 if((de->flags[-high_sierra] & ~2)!= 0){
1425 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1427 inode->i_ino, de->flags[-high_sierra]);
1431 inode->i_mtime.tv_sec =
1432 inode->i_atime.tv_sec =
1433 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1434 inode->i_mtime.tv_nsec =
1435 inode->i_atime.tv_nsec =
1436 inode->i_ctime.tv_nsec = 0;
1438 ei->i_first_extent = (isonum_733(de->extent) +
1439 isonum_711(de->ext_attr_length));
1441 /* Set the number of blocks for stat() - should be done before RR */
1442 inode->i_blocks = (inode->i_size + 511) >> 9;
1445 * Now test for possible Rock Ridge extensions which will override
1446 * some of these numbers in the inode structure.
1450 parse_rock_ridge_inode(de, inode, relocated);
1451 /* if we want uid/gid set, override the rock ridge setting */
1453 inode->i_uid = sbi->s_uid;
1455 inode->i_gid = sbi->s_gid;
1457 /* Now set final access rights if overriding rock ridge setting */
1458 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1459 sbi->s_dmode != ISOFS_INVALID_MODE)
1460 inode->i_mode = S_IFDIR | sbi->s_dmode;
1461 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1462 sbi->s_fmode != ISOFS_INVALID_MODE)
1463 inode->i_mode = S_IFREG | sbi->s_fmode;
1465 /* Install the inode operations vector */
1466 if (S_ISREG(inode->i_mode)) {
1467 inode->i_fop = &generic_ro_fops;
1468 switch (ei->i_file_format) {
1469 #ifdef CONFIG_ZISOFS
1470 case isofs_file_compressed:
1471 inode->i_data.a_ops = &zisofs_aops;
1475 inode->i_data.a_ops = &isofs_aops;
1478 } else if (S_ISDIR(inode->i_mode)) {
1479 inode->i_op = &isofs_dir_inode_operations;
1480 inode->i_fop = &isofs_dir_operations;
1481 } else if (S_ISLNK(inode->i_mode)) {
1482 inode->i_op = &page_symlink_inode_operations;
1483 inode_nohighmem(inode);
1484 inode->i_data.a_ops = &isofs_symlink_aops;
1486 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1487 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1497 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1502 struct isofs_iget5_callback_data {
1503 unsigned long block;
1504 unsigned long offset;
1507 static int isofs_iget5_test(struct inode *ino, void *data)
1509 struct iso_inode_info *i = ISOFS_I(ino);
1510 struct isofs_iget5_callback_data *d =
1511 (struct isofs_iget5_callback_data*)data;
1512 return (i->i_iget5_block == d->block)
1513 && (i->i_iget5_offset == d->offset);
1516 static int isofs_iget5_set(struct inode *ino, void *data)
1518 struct iso_inode_info *i = ISOFS_I(ino);
1519 struct isofs_iget5_callback_data *d =
1520 (struct isofs_iget5_callback_data*)data;
1521 i->i_iget5_block = d->block;
1522 i->i_iget5_offset = d->offset;
1526 /* Store, in the inode's containing structure, the block and block
1527 * offset that point to the underlying meta-data for the inode. The
1528 * code below is otherwise similar to the iget() code in
1529 * include/linux/fs.h */
1530 struct inode *__isofs_iget(struct super_block *sb,
1531 unsigned long block,
1532 unsigned long offset,
1535 unsigned long hashval;
1536 struct inode *inode;
1537 struct isofs_iget5_callback_data data;
1540 if (offset >= 1ul << sb->s_blocksize_bits)
1541 return ERR_PTR(-EINVAL);
1544 data.offset = offset;
1546 hashval = (block << sb->s_blocksize_bits) | offset;
1548 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1549 &isofs_iget5_set, &data);
1552 return ERR_PTR(-ENOMEM);
1554 if (inode->i_state & I_NEW) {
1555 ret = isofs_read_inode(inode, relocated);
1558 inode = ERR_PTR(ret);
1560 unlock_new_inode(inode);
1567 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1568 int flags, const char *dev_name, void *data)
1570 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1573 static struct file_system_type iso9660_fs_type = {
1574 .owner = THIS_MODULE,
1576 .mount = isofs_mount,
1577 .kill_sb = kill_block_super,
1578 .fs_flags = FS_REQUIRES_DEV,
1580 MODULE_ALIAS_FS("iso9660");
1581 MODULE_ALIAS("iso9660");
1583 static int __init init_iso9660_fs(void)
1585 int err = init_inodecache();
1588 #ifdef CONFIG_ZISOFS
1589 err = zisofs_init();
1593 err = register_filesystem(&iso9660_fs_type);
1598 #ifdef CONFIG_ZISOFS
1602 destroy_inodecache();
1607 static void __exit exit_iso9660_fs(void)
1609 unregister_filesystem(&iso9660_fs_type);
1610 #ifdef CONFIG_ZISOFS
1613 destroy_inodecache();
1616 module_init(init_iso9660_fs)
1617 module_exit(exit_iso9660_fs)
1618 MODULE_LICENSE("GPL");