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>
33 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
34 static int isofs_dentry_cmpi(const struct dentry *dentry,
35 unsigned int len, const char *str, const struct qstr *name);
38 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
39 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
40 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
41 unsigned int len, const char *str, const struct qstr *name);
42 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
43 unsigned int len, const char *str, const struct qstr *name);
46 static void isofs_put_super(struct super_block *sb)
48 struct isofs_sb_info *sbi = ISOFS_SB(sb);
51 unload_nls(sbi->s_nls_iocharset);
59 static int isofs_read_inode(struct inode *, int relocated);
60 static int isofs_statfs (struct dentry *, struct kstatfs *);
61 static int isofs_show_options(struct seq_file *, struct dentry *);
63 static struct kmem_cache *isofs_inode_cachep;
65 static struct inode *isofs_alloc_inode(struct super_block *sb)
67 struct iso_inode_info *ei;
68 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
71 return &ei->vfs_inode;
74 static void isofs_i_callback(struct rcu_head *head)
76 struct inode *inode = container_of(head, struct inode, i_rcu);
77 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
80 static void isofs_destroy_inode(struct inode *inode)
82 call_rcu(&inode->i_rcu, isofs_i_callback);
85 static void init_once(void *foo)
87 struct iso_inode_info *ei = foo;
89 inode_init_once(&ei->vfs_inode);
92 static int __init init_inodecache(void)
94 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
95 sizeof(struct iso_inode_info),
96 0, (SLAB_RECLAIM_ACCOUNT|
97 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
99 if (!isofs_inode_cachep)
104 static void destroy_inodecache(void)
107 * Make sure all delayed rcu free inodes are flushed before we
111 kmem_cache_destroy(isofs_inode_cachep);
114 static int isofs_remount(struct super_block *sb, int *flags, char *data)
117 if (!(*flags & MS_RDONLY))
122 static const struct super_operations isofs_sops = {
123 .alloc_inode = isofs_alloc_inode,
124 .destroy_inode = isofs_destroy_inode,
125 .put_super = isofs_put_super,
126 .statfs = isofs_statfs,
127 .remount_fs = isofs_remount,
128 .show_options = isofs_show_options,
132 static const struct dentry_operations isofs_dentry_ops[] = {
134 .d_hash = isofs_hashi,
135 .d_compare = isofs_dentry_cmpi,
139 .d_hash = isofs_hash_ms,
140 .d_compare = isofs_dentry_cmp_ms,
143 .d_hash = isofs_hashi_ms,
144 .d_compare = isofs_dentry_cmpi_ms,
149 struct iso9660_options{
151 unsigned int joliet:1;
152 unsigned int cruft:1;
154 unsigned int showassoc:1;
155 unsigned int nocompress:1;
156 unsigned int overriderockperm:1;
157 unsigned int uid_set:1;
158 unsigned int gid_set:1;
162 unsigned int blocksize;
174 * Compute the hash for the isofs name corresponding to the dentry.
177 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
187 while (len && name[len-1] == '.')
191 hash = init_name_hash(dentry);
193 c = tolower(*name++);
194 hash = partial_name_hash(c, hash);
196 qstr->hash = end_name_hash(hash);
202 * Compare of two isofs names.
204 static int isofs_dentry_cmp_common(
205 unsigned int len, const char *str,
206 const struct qstr *name, int ms, int ci)
210 /* A filename cannot end in '.' or we treat it like it has none */
214 while (alen && name->name[alen-1] == '.')
216 while (blen && str[blen-1] == '.')
221 if (strncasecmp(name->name, str, alen) == 0)
224 if (strncmp(name->name, str, alen) == 0)
232 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
234 return isofs_hashi_common(dentry, qstr, 0);
238 isofs_dentry_cmpi(const struct dentry *dentry,
239 unsigned int len, const char *str, const struct qstr *name)
241 return isofs_dentry_cmp_common(len, str, name, 0, 1);
246 * Compute the hash for the isofs name corresponding to the dentry.
249 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
257 while (len && name[len-1] == '.')
261 qstr->hash = full_name_hash(dentry, name, len);
267 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
269 return isofs_hash_common(dentry, qstr, 1);
273 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
275 return isofs_hashi_common(dentry, qstr, 1);
279 isofs_dentry_cmp_ms(const struct dentry *dentry,
280 unsigned int len, const char *str, const struct qstr *name)
282 return isofs_dentry_cmp_common(len, str, name, 1, 0);
286 isofs_dentry_cmpi_ms(const struct dentry *dentry,
287 unsigned int len, const char *str, const struct qstr *name)
289 return isofs_dentry_cmp_common(len, str, name, 1, 1);
294 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
295 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
296 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
297 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
300 static const match_table_t tokens = {
301 {Opt_norock, "norock"},
302 {Opt_nojoliet, "nojoliet"},
303 {Opt_unhide, "unhide"},
305 {Opt_showassoc, "showassoc"},
306 {Opt_cruft, "cruft"},
308 {Opt_iocharset, "iocharset=%s"},
309 {Opt_map_a, "map=acorn"},
310 {Opt_map_a, "map=a"},
311 {Opt_map_n, "map=normal"},
312 {Opt_map_n, "map=n"},
313 {Opt_map_o, "map=off"},
314 {Opt_map_o, "map=o"},
315 {Opt_session, "session=%u"},
316 {Opt_sb, "sbsector=%u"},
317 {Opt_check_r, "check=relaxed"},
318 {Opt_check_r, "check=r"},
319 {Opt_check_s, "check=strict"},
320 {Opt_check_s, "check=s"},
323 {Opt_mode, "mode=%u"},
324 {Opt_dmode, "dmode=%u"},
325 {Opt_overriderockperm, "overriderockperm"},
326 {Opt_block, "block=%u"},
327 {Opt_ignore, "conv=binary"},
328 {Opt_ignore, "conv=b"},
329 {Opt_ignore, "conv=text"},
330 {Opt_ignore, "conv=t"},
331 {Opt_ignore, "conv=mtext"},
332 {Opt_ignore, "conv=m"},
333 {Opt_ignore, "conv=auto"},
334 {Opt_ignore, "conv=a"},
335 {Opt_nocompress, "nocompress"},
339 static int parse_options(char *options, struct iso9660_options *popt)
350 popt->check = 'u'; /* unset */
351 popt->nocompress = 0;
352 popt->blocksize = 1024;
353 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
356 popt->gid = GLOBAL_ROOT_GID;
357 popt->uid = GLOBAL_ROOT_UID;
358 popt->iocharset = NULL;
360 popt->overriderockperm = 0;
366 while ((p = strsep(&options, ",")) != NULL) {
368 substring_t args[MAX_OPT_ARGS];
374 token = match_token(p, tokens, args);
397 popt->iocharset = match_strdup(&args[0]);
410 if (match_int(&args[0], &option))
414 * Track numbers are supposed to be in range 1-99, the
415 * mount option starts indexing at 0.
419 popt->session = n + 1;
422 if (match_int(&args[0], &option))
424 popt->sbsector = option;
435 if (match_int(&args[0], &option))
437 popt->uid = make_kuid(current_user_ns(), option);
438 if (!uid_valid(popt->uid))
443 if (match_int(&args[0], &option))
445 popt->gid = make_kgid(current_user_ns(), option);
446 if (!gid_valid(popt->gid))
451 if (match_int(&args[0], &option))
453 popt->fmode = option;
456 if (match_int(&args[0], &option))
458 popt->dmode = option;
460 case Opt_overriderockperm:
461 popt->overriderockperm = 1;
464 if (match_int(&args[0], &option))
467 if (n != 512 && n != 1024 && n != 2048)
472 popt->nocompress = 1;
482 * Display the mount options in /proc/mounts.
484 static int isofs_show_options(struct seq_file *m, struct dentry *root)
486 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
488 if (!sbi->s_rock) seq_puts(m, ",norock");
489 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
490 if (sbi->s_cruft) seq_puts(m, ",cruft");
491 if (sbi->s_hide) seq_puts(m, ",hide");
492 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
493 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
494 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
495 if (sbi->s_utf8) seq_puts(m, ",utf8");
497 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
498 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
499 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
500 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
502 if (root->d_sb->s_blocksize != 1024)
503 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
506 seq_printf(m, ",uid=%u",
507 from_kuid_munged(&init_user_ns, sbi->s_uid));
509 seq_printf(m, ",gid=%u",
510 from_kgid_munged(&init_user_ns, sbi->s_gid));
512 if (sbi->s_dmode != ISOFS_INVALID_MODE)
513 seq_printf(m, ",dmode=%o", sbi->s_dmode);
514 if (sbi->s_fmode != ISOFS_INVALID_MODE)
515 seq_printf(m, ",fmode=%o", sbi->s_fmode);
517 if (sbi->s_nls_iocharset &&
518 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
519 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
524 * look if the driver can tell the multi session redirection value
526 * don't change this if you don't know what you do, please!
527 * Multisession is legal only with XA disks.
528 * A non-XA disk with more than one volume descriptor may do it right, but
529 * usually is written in a nowhere standardized "multi-partition" manner.
530 * Multisession uses absolute addressing (solely the first frame of the whole
531 * track is #0), multi-partition uses relative addressing (each first frame of
532 * each track is #0), and a track is not a session.
534 * A broken CDwriter software or drive firmware does not set new standards,
535 * at least not if conflicting with the existing ones.
539 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
541 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
543 struct cdrom_multisession ms_info;
544 unsigned int vol_desc_start;
545 struct block_device *bdev = sb->s_bdev;
549 ms_info.addr_format=CDROM_LBA;
551 struct cdrom_tocentry Te;
552 Te.cdte_track=session;
553 Te.cdte_format=CDROM_LBA;
554 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
556 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
557 session, Te.cdte_addr.lba,
558 Te.cdte_ctrl&CDROM_DATA_TRACK);
559 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
560 return Te.cdte_addr.lba;
563 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
565 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
567 printk(KERN_ERR "ISOFS: Invalid session number\n");
569 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
571 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
572 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
576 #if WE_OBEY_THE_WRITTEN_STANDARDS
577 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
579 vol_desc_start=ms_info.addr.lba;
580 return vol_desc_start;
584 * Check if root directory is empty (has less than 3 files).
586 * Used to detect broken CDs where ISO root directory is empty but Joliet root
587 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
588 * (and Joliet used instead) or else no files would be visible.
590 static bool rootdir_empty(struct super_block *sb, unsigned long block)
592 int offset = 0, files = 0, de_len;
593 struct iso_directory_record *de;
594 struct buffer_head *bh;
596 bh = sb_bread(sb, block);
600 de = (struct iso_directory_record *) (bh->b_data + offset);
601 de_len = *(unsigned char *) de;
612 * Initialize the superblock and read the root inode.
614 * Note: a check_disk_change() has been done immediately prior
615 * to this call, so we don't need to check again.
617 static int isofs_fill_super(struct super_block *s, void *data, int silent)
619 struct buffer_head *bh = NULL, *pri_bh = NULL;
620 struct hs_primary_descriptor *h_pri = NULL;
621 struct iso_primary_descriptor *pri = NULL;
622 struct iso_supplementary_descriptor *sec = NULL;
623 struct iso_directory_record *rootp;
625 struct iso9660_options opt;
626 struct isofs_sb_info *sbi;
627 unsigned long first_data_zone;
628 int joliet_level = 0;
629 int iso_blknum, block;
631 int table, error = -EINVAL;
632 unsigned int vol_desc_start;
634 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
639 if (!parse_options((char *)data, &opt))
643 * First of all, get the hardware blocksize for this device.
644 * If we don't know what it is, or the hardware blocksize is
645 * larger than the blocksize the user specified, then use
649 * What if bugger tells us to go beyond page size?
651 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
653 sbi->s_high_sierra = 0; /* default is iso9660 */
654 sbi->s_session = opt.session;
655 sbi->s_sbsector = opt.sbsector;
657 vol_desc_start = (opt.sbsector != -1) ?
658 opt.sbsector : isofs_get_last_session(s,opt.session);
660 for (iso_blknum = vol_desc_start+16;
661 iso_blknum < vol_desc_start+100; iso_blknum++) {
662 struct hs_volume_descriptor *hdp;
663 struct iso_volume_descriptor *vdp;
665 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
666 if (!(bh = sb_bread(s, block)))
669 vdp = (struct iso_volume_descriptor *)bh->b_data;
670 hdp = (struct hs_volume_descriptor *)bh->b_data;
673 * Due to the overlapping physical location of the descriptors,
674 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
675 * proper identification in this case, we first check for ISO.
677 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
678 if (isonum_711(vdp->type) == ISO_VD_END)
680 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
682 pri = (struct iso_primary_descriptor *)vdp;
683 /* Save the buffer in case we need it ... */
689 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
690 sec = (struct iso_supplementary_descriptor *)vdp;
691 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
693 if (sec->escape[2] == 0x40)
695 else if (sec->escape[2] == 0x43)
697 else if (sec->escape[2] == 0x45)
700 printk(KERN_DEBUG "ISO 9660 Extensions: "
701 "Microsoft Joliet Level %d\n",
706 /* Unknown supplementary volume descriptor */
712 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
713 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
716 sbi->s_high_sierra = 1;
718 h_pri = (struct hs_primary_descriptor *)vdp;
723 /* Just skip any volume descriptors we don't recognize */
729 * If we fall through, either no volume descriptor was found,
730 * or else we passed a primary descriptor looking for others.
733 goto out_unknown_format;
739 /* We don't support read-write mounts */
740 if (!(s->s_flags & MS_RDONLY)) {
745 if (joliet_level && (!pri || !opt.rock)) {
746 /* This is the case of Joliet with the norock mount flag.
747 * A disc with both Joliet and Rock Ridge is handled later
749 pri = (struct iso_primary_descriptor *) sec;
752 if(sbi->s_high_sierra){
753 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
754 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
755 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
756 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
760 rootp = (struct iso_directory_record *) pri->root_directory_record;
761 sbi->s_nzones = isonum_733(pri->volume_space_size);
762 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
763 sbi->s_max_size = isonum_733(pri->volume_space_size);
766 sbi->s_ninodes = 0; /* No way to figure this out easily */
768 orig_zonesize = sbi->s_log_zone_size;
770 * If the zone size is smaller than the hardware sector size,
771 * this is a fatal error. This would occur if the disc drive
772 * had sectors that were 2048 bytes, but the filesystem had
773 * blocks that were 512 bytes (which should only very rarely
776 if (orig_zonesize < opt.blocksize)
779 /* RDE: convert log zone size to bit shift */
780 switch (sbi->s_log_zone_size) {
781 case 512: sbi->s_log_zone_size = 9; break;
782 case 1024: sbi->s_log_zone_size = 10; break;
783 case 2048: sbi->s_log_zone_size = 11; break;
786 goto out_bad_zone_size;
789 s->s_magic = ISOFS_SUPER_MAGIC;
792 * With multi-extent files, file size is only limited by the maximum
793 * size of a file system, which is 8 TB.
795 s->s_maxbytes = 0x80000000000LL;
797 /* Set this for reference. Its not currently used except on write
798 which we don't have .. */
800 first_data_zone = isonum_733(rootp->extent) +
801 isonum_711(rootp->ext_attr_length);
802 sbi->s_firstdatazone = first_data_zone;
804 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
805 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
806 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
807 if(sbi->s_high_sierra)
808 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
812 * If the Joliet level is set, we _may_ decide to use the
813 * secondary descriptor, but can't be sure until after we
814 * read the root inode. But before reading the root inode
815 * we may need to change the device blocksize, and would
816 * rather release the old buffer first. So, we cache the
817 * first_data_zone value from the secondary descriptor.
820 pri = (struct iso_primary_descriptor *) sec;
821 rootp = (struct iso_directory_record *)
822 pri->root_directory_record;
823 first_data_zone = isonum_733(rootp->extent) +
824 isonum_711(rootp->ext_attr_length);
828 * We're all done using the volume descriptor, and may need
829 * to change the device blocksize, so release the buffer now.
835 * Force the blocksize to 512 for 512 byte sectors. The file
836 * read primitives really get it wrong in a bad way if we don't
839 * Note - we should never be setting the blocksize to something
840 * less than the hardware sector size for the device. If we
841 * do, we would end up having to read larger buffers and split
842 * out portions to satisfy requests.
844 * Note2- the idea here is that we want to deal with the optimal
845 * zonesize in the filesystem. If we have it set to something less,
846 * then we have horrible problems with trying to piece together
847 * bits of adjacent blocks in order to properly read directory
848 * entries. By forcing the blocksize in this way, we ensure
849 * that we will never be required to do this.
851 sb_set_blocksize(s, orig_zonesize);
853 sbi->s_nls_iocharset = NULL;
856 if (joliet_level && opt.utf8 == 0) {
857 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
858 sbi->s_nls_iocharset = load_nls(p);
859 if (! sbi->s_nls_iocharset) {
860 /* Fail only if explicit charset specified */
863 sbi->s_nls_iocharset = load_nls_default();
867 s->s_op = &isofs_sops;
868 s->s_export_op = &isofs_export_ops;
869 sbi->s_mapping = opt.map;
870 sbi->s_rock = (opt.rock ? 2 : 0);
871 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
872 sbi->s_cruft = opt.cruft;
873 sbi->s_hide = opt.hide;
874 sbi->s_showassoc = opt.showassoc;
875 sbi->s_uid = opt.uid;
876 sbi->s_gid = opt.gid;
877 sbi->s_uid_set = opt.uid_set;
878 sbi->s_gid_set = opt.gid_set;
879 sbi->s_utf8 = opt.utf8;
880 sbi->s_nocompress = opt.nocompress;
881 sbi->s_overriderockperm = opt.overriderockperm;
883 * It would be incredibly stupid to allow people to mark every file
884 * on the disk as suid, so we merely allow them to set the default
887 if (opt.fmode != ISOFS_INVALID_MODE)
888 sbi->s_fmode = opt.fmode & 0777;
890 sbi->s_fmode = ISOFS_INVALID_MODE;
891 if (opt.dmode != ISOFS_INVALID_MODE)
892 sbi->s_dmode = opt.dmode & 0777;
894 sbi->s_dmode = ISOFS_INVALID_MODE;
897 * Read the root inode, which _may_ result in changing
898 * the s_rock flag. Once we have the final s_rock value,
899 * we then decide whether to use the Joliet descriptor.
901 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
906 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
907 * correct Joliet root directory.
909 if (sbi->s_rock == 1 && joliet_level &&
910 rootdir_empty(s, sbi->s_firstdatazone)) {
912 "ISOFS: primary root directory is empty. "
913 "Disabling Rock Ridge and switching to Joliet.");
918 * If this disk has both Rock Ridge and Joliet on it, then we
919 * want to use Rock Ridge by default. This can be overridden
920 * by using the norock mount option. There is still one other
921 * possibility that is not taken into account: a Rock Ridge
922 * CD with Unicode names. Until someone sees such a beast, it
923 * will not be supported.
925 if (sbi->s_rock == 1) {
927 } else if (joliet_level) {
929 if (sbi->s_firstdatazone != first_data_zone) {
930 sbi->s_firstdatazone = first_data_zone;
932 "ISOFS: changing to secondary root\n");
934 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
940 if (opt.check == 'u') {
941 /* Only Joliet is case insensitive by default */
947 sbi->s_joliet_level = joliet_level;
949 /* Make sure the root inode is a directory */
950 if (!S_ISDIR(inode->i_mode)) {
952 "isofs_fill_super: root inode is not a directory. "
953 "Corrupted media?\n");
960 if (opt.check == 'r')
962 sbi->s_check = opt.check;
965 s->s_d_op = &isofs_dentry_ops[table - 1];
967 /* get the root dentry */
968 s->s_root = d_make_root(inode);
974 kfree(opt.iocharset);
979 * Display error messages and free resources.
985 error = PTR_ERR(inode);
986 if (error != -ENOMEM)
987 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
990 unload_nls(sbi->s_nls_iocharset);
994 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
995 __func__, s->s_id, iso_blknum, block);
998 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
999 sbi->s_log_zone_size);
1002 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1003 orig_zonesize, opt.blocksize);
1007 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1013 kfree(opt.iocharset);
1015 s->s_fs_info = NULL;
1019 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1021 struct super_block *sb = dentry->d_sb;
1022 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1024 buf->f_type = ISOFS_SUPER_MAGIC;
1025 buf->f_bsize = sb->s_blocksize;
1026 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1027 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1030 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1032 buf->f_fsid.val[0] = (u32)id;
1033 buf->f_fsid.val[1] = (u32)(id >> 32);
1034 buf->f_namelen = NAME_MAX;
1039 * Get a set of blocks; filling in buffer_heads if already allocated
1040 * or getblk() if they are not. Returns the number of blocks inserted
1043 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1044 struct buffer_head **bh, unsigned long nblocks)
1046 unsigned long b_off = iblock;
1047 unsigned offset, sect_size;
1048 unsigned int firstext;
1049 unsigned long nextblk, nextoff;
1050 int section, rv, error;
1051 struct iso_inode_info *ei = ISOFS_I(inode);
1055 if (iblock != b_off) {
1056 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1062 firstext = ei->i_first_extent;
1063 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1064 nextblk = ei->i_next_section_block;
1065 nextoff = ei->i_next_section_offset;
1069 /* If we are *way* beyond the end of the file, print a message.
1070 * Access beyond the end of the file up to the next page boundary
1071 * is normal, however because of the way the page cache works.
1072 * In this case, we just return 0 so that we can properly fill
1073 * the page with useless information without generating any
1076 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1077 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1079 (unsigned long long)inode->i_size);
1083 /* On the last section, nextblk == 0, section size is likely to
1084 * exceed sect_size by a partial block, and access beyond the
1085 * end of the file will reach beyond the section size, too.
1087 while (nextblk && (b_off >= (offset + sect_size))) {
1088 struct inode *ninode;
1090 offset += sect_size;
1091 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1092 if (IS_ERR(ninode)) {
1093 error = PTR_ERR(ninode);
1096 firstext = ISOFS_I(ninode)->i_first_extent;
1097 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1098 nextblk = ISOFS_I(ninode)->i_next_section_block;
1099 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1102 if (++section > 100) {
1103 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1104 " aborting...\n", __func__);
1105 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1106 "nextblk=%lu nextoff=%lu\n", __func__,
1107 b_off, firstext, (unsigned) sect_size,
1114 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1116 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1120 bh++; /* Next buffer head */
1121 b_off++; /* Next buffer offset */
1128 return rv != 0 ? rv : error;
1132 * Used by the standard interfaces.
1134 static int isofs_get_block(struct inode *inode, sector_t iblock,
1135 struct buffer_head *bh_result, int create)
1140 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1144 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1145 return ret < 0 ? ret : 0;
1148 static int isofs_bmap(struct inode *inode, sector_t block)
1150 struct buffer_head dummy;
1154 dummy.b_blocknr = -1000;
1155 error = isofs_get_block(inode, block, &dummy, 0);
1157 return dummy.b_blocknr;
1161 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1163 sector_t blknr = isofs_bmap(inode, block);
1166 return sb_bread(inode->i_sb, blknr);
1169 static int isofs_readpage(struct file *file, struct page *page)
1171 return mpage_readpage(page, isofs_get_block);
1174 static int isofs_readpages(struct file *file, struct address_space *mapping,
1175 struct list_head *pages, unsigned nr_pages)
1177 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1180 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1182 return generic_block_bmap(mapping,block,isofs_get_block);
1185 static const struct address_space_operations isofs_aops = {
1186 .readpage = isofs_readpage,
1187 .readpages = isofs_readpages,
1191 static int isofs_read_level3_size(struct inode *inode)
1193 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1194 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1195 struct buffer_head *bh = NULL;
1196 unsigned long block, offset, block_saved, offset_saved;
1198 int more_entries = 0;
1199 struct iso_directory_record *tmpde = NULL;
1200 struct iso_inode_info *ei = ISOFS_I(inode);
1204 /* The first 16 blocks are reserved as the System Area. Thus,
1205 * no inodes can appear in block 0. We use this to flag that
1206 * this is the last section. */
1207 ei->i_next_section_block = 0;
1208 ei->i_next_section_offset = 0;
1210 block = ei->i_iget5_block;
1211 offset = ei->i_iget5_offset;
1214 struct iso_directory_record *de;
1215 unsigned int de_len;
1218 bh = sb_bread(inode->i_sb, block);
1222 de = (struct iso_directory_record *) (bh->b_data + offset);
1223 de_len = *(unsigned char *) de;
1233 block_saved = block;
1234 offset_saved = offset;
1237 /* Make sure we have a full directory entry */
1238 if (offset >= bufsize) {
1239 int slop = bufsize - offset + de_len;
1241 tmpde = kmalloc(256, GFP_KERNEL);
1245 memcpy(tmpde, de, slop);
1246 offset &= bufsize - 1;
1251 bh = sb_bread(inode->i_sb, block);
1254 memcpy((void *)tmpde+slop, bh->b_data, offset);
1259 inode->i_size += isonum_733(de->size);
1261 ei->i_next_section_block = block_saved;
1262 ei->i_next_section_offset = offset_saved;
1265 more_entries = de->flags[-high_sierra] & 0x80;
1270 } while (more_entries);
1283 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1288 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1289 "isofs_read_level3_size: inode=%lu\n",
1290 __func__, inode->i_ino);
1294 static int isofs_read_inode(struct inode *inode, int relocated)
1296 struct super_block *sb = inode->i_sb;
1297 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1298 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1299 unsigned long block;
1300 int high_sierra = sbi->s_high_sierra;
1301 struct buffer_head *bh;
1302 struct iso_directory_record *de;
1303 struct iso_directory_record *tmpde = NULL;
1304 unsigned int de_len;
1305 unsigned long offset;
1306 struct iso_inode_info *ei = ISOFS_I(inode);
1309 block = ei->i_iget5_block;
1310 bh = sb_bread(inode->i_sb, block);
1314 offset = ei->i_iget5_offset;
1316 de = (struct iso_directory_record *) (bh->b_data + offset);
1317 de_len = *(unsigned char *) de;
1319 if (offset + de_len > bufsize) {
1320 int frag1 = bufsize - offset;
1322 tmpde = kmalloc(de_len, GFP_KERNEL);
1327 memcpy(tmpde, bh->b_data + offset, frag1);
1329 bh = sb_bread(inode->i_sb, ++block);
1332 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1336 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1338 ISOFS_BUFFER_BITS(inode));
1340 /* Assume it is a normal-format file unless told otherwise */
1341 ei->i_file_format = isofs_file_normal;
1343 if (de->flags[-high_sierra] & 2) {
1344 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1345 inode->i_mode = S_IFDIR | sbi->s_dmode;
1347 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1348 set_nlink(inode, 1); /*
1349 * Set to 1. We know there are 2, but
1350 * the find utility tries to optimize
1351 * if it is 2, and it screws up. It is
1352 * easier to give 1 which tells find to
1353 * do it the hard way.
1356 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1357 inode->i_mode = S_IFREG | sbi->s_fmode;
1360 * Set default permissions: r-x for all. The disc
1361 * could be shared with DOS machines so virtually
1362 * anything could be a valid executable.
1364 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1366 set_nlink(inode, 1);
1368 inode->i_uid = sbi->s_uid;
1369 inode->i_gid = sbi->s_gid;
1370 inode->i_blocks = 0;
1372 ei->i_format_parm[0] = 0;
1373 ei->i_format_parm[1] = 0;
1374 ei->i_format_parm[2] = 0;
1376 ei->i_section_size = isonum_733(de->size);
1377 if (de->flags[-high_sierra] & 0x80) {
1378 ret = isofs_read_level3_size(inode);
1383 ei->i_next_section_block = 0;
1384 ei->i_next_section_offset = 0;
1385 inode->i_size = isonum_733(de->size);
1389 * Some dipshit decided to store some other bit of information
1390 * in the high byte of the file length. Truncate size in case
1391 * this CDROM was mounted with the cruft option.
1395 inode->i_size &= 0x00ffffff;
1397 if (de->interleave[0]) {
1398 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1402 /* I have no idea what file_unit_size is used for, so
1403 we will flag it for now */
1404 if (de->file_unit_size[0] != 0) {
1405 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1409 /* I have no idea what other flag bits are used for, so
1410 we will flag it for now */
1412 if((de->flags[-high_sierra] & ~2)!= 0){
1413 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1415 inode->i_ino, de->flags[-high_sierra]);
1419 inode->i_mtime.tv_sec =
1420 inode->i_atime.tv_sec =
1421 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1422 inode->i_mtime.tv_nsec =
1423 inode->i_atime.tv_nsec =
1424 inode->i_ctime.tv_nsec = 0;
1426 ei->i_first_extent = (isonum_733(de->extent) +
1427 isonum_711(de->ext_attr_length));
1429 /* Set the number of blocks for stat() - should be done before RR */
1430 inode->i_blocks = (inode->i_size + 511) >> 9;
1433 * Now test for possible Rock Ridge extensions which will override
1434 * some of these numbers in the inode structure.
1438 parse_rock_ridge_inode(de, inode, relocated);
1439 /* if we want uid/gid set, override the rock ridge setting */
1441 inode->i_uid = sbi->s_uid;
1443 inode->i_gid = sbi->s_gid;
1445 /* Now set final access rights if overriding rock ridge setting */
1446 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1447 sbi->s_dmode != ISOFS_INVALID_MODE)
1448 inode->i_mode = S_IFDIR | sbi->s_dmode;
1449 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1450 sbi->s_fmode != ISOFS_INVALID_MODE)
1451 inode->i_mode = S_IFREG | sbi->s_fmode;
1453 /* Install the inode operations vector */
1454 if (S_ISREG(inode->i_mode)) {
1455 inode->i_fop = &generic_ro_fops;
1456 switch (ei->i_file_format) {
1457 #ifdef CONFIG_ZISOFS
1458 case isofs_file_compressed:
1459 inode->i_data.a_ops = &zisofs_aops;
1463 inode->i_data.a_ops = &isofs_aops;
1466 } else if (S_ISDIR(inode->i_mode)) {
1467 inode->i_op = &isofs_dir_inode_operations;
1468 inode->i_fop = &isofs_dir_operations;
1469 } else if (S_ISLNK(inode->i_mode)) {
1470 inode->i_op = &page_symlink_inode_operations;
1471 inode_nohighmem(inode);
1472 inode->i_data.a_ops = &isofs_symlink_aops;
1474 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1475 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1485 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1490 struct isofs_iget5_callback_data {
1491 unsigned long block;
1492 unsigned long offset;
1495 static int isofs_iget5_test(struct inode *ino, void *data)
1497 struct iso_inode_info *i = ISOFS_I(ino);
1498 struct isofs_iget5_callback_data *d =
1499 (struct isofs_iget5_callback_data*)data;
1500 return (i->i_iget5_block == d->block)
1501 && (i->i_iget5_offset == d->offset);
1504 static int isofs_iget5_set(struct inode *ino, void *data)
1506 struct iso_inode_info *i = ISOFS_I(ino);
1507 struct isofs_iget5_callback_data *d =
1508 (struct isofs_iget5_callback_data*)data;
1509 i->i_iget5_block = d->block;
1510 i->i_iget5_offset = d->offset;
1514 /* Store, in the inode's containing structure, the block and block
1515 * offset that point to the underlying meta-data for the inode. The
1516 * code below is otherwise similar to the iget() code in
1517 * include/linux/fs.h */
1518 struct inode *__isofs_iget(struct super_block *sb,
1519 unsigned long block,
1520 unsigned long offset,
1523 unsigned long hashval;
1524 struct inode *inode;
1525 struct isofs_iget5_callback_data data;
1528 if (offset >= 1ul << sb->s_blocksize_bits)
1529 return ERR_PTR(-EINVAL);
1532 data.offset = offset;
1534 hashval = (block << sb->s_blocksize_bits) | offset;
1536 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1537 &isofs_iget5_set, &data);
1540 return ERR_PTR(-ENOMEM);
1542 if (inode->i_state & I_NEW) {
1543 ret = isofs_read_inode(inode, relocated);
1546 inode = ERR_PTR(ret);
1548 unlock_new_inode(inode);
1555 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1556 int flags, const char *dev_name, void *data)
1558 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1561 static struct file_system_type iso9660_fs_type = {
1562 .owner = THIS_MODULE,
1564 .mount = isofs_mount,
1565 .kill_sb = kill_block_super,
1566 .fs_flags = FS_REQUIRES_DEV,
1568 MODULE_ALIAS_FS("iso9660");
1569 MODULE_ALIAS("iso9660");
1571 static int __init init_iso9660_fs(void)
1573 int err = init_inodecache();
1576 #ifdef CONFIG_ZISOFS
1577 err = zisofs_init();
1581 err = register_filesystem(&iso9660_fs_type);
1586 #ifdef CONFIG_ZISOFS
1590 destroy_inodecache();
1595 static void __exit exit_iso9660_fs(void)
1597 unregister_filesystem(&iso9660_fs_type);
1598 #ifdef CONFIG_ZISOFS
1601 destroy_inodecache();
1604 module_init(init_iso9660_fs)
1605 module_exit(exit_iso9660_fs)
1606 MODULE_LICENSE("GPL");