1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/isofs/inode.c
5 * (C) 1991 Linus Torvalds - minix filesystem
6 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
7 * 1994 Eberhard Mönkeberg - multi session handling.
8 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
9 * 1997 Gordon Chaffee - Joliet CDs
10 * 1998 Eric Lammerts - ISO 9660 Level 3
11 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
12 * 2004 Paul Serice - NFS Export Operations
15 #include <linux/init.h>
16 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/cred.h>
20 #include <linux/nls.h>
21 #include <linux/ctype.h>
22 #include <linux/statfs.h>
23 #include <linux/cdrom.h>
24 #include <linux/parser.h>
25 #include <linux/mpage.h>
26 #include <linux/user_namespace.h>
27 #include <linux/seq_file.h>
28 #include <linux/blkdev.h>
33 /* max tz offset is 13 hours */
34 #define MAX_TZ_OFFSET (52*15*60)
38 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
39 static int isofs_dentry_cmpi(const struct dentry *dentry,
40 unsigned int len, const char *str, const struct qstr *name);
43 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
44 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
45 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
46 unsigned int len, const char *str, const struct qstr *name);
47 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
48 unsigned int len, const char *str, const struct qstr *name);
51 static void isofs_put_super(struct super_block *sb)
53 struct isofs_sb_info *sbi = ISOFS_SB(sb);
56 unload_nls(sbi->s_nls_iocharset);
64 static int isofs_read_inode(struct inode *, int relocated);
65 static int isofs_statfs (struct dentry *, struct kstatfs *);
66 static int isofs_show_options(struct seq_file *, struct dentry *);
68 static struct kmem_cache *isofs_inode_cachep;
70 static struct inode *isofs_alloc_inode(struct super_block *sb)
72 struct iso_inode_info *ei;
73 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
76 return &ei->vfs_inode;
79 static void isofs_free_inode(struct inode *inode)
81 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
84 static void init_once(void *foo)
86 struct iso_inode_info *ei = foo;
88 inode_init_once(&ei->vfs_inode);
91 static int __init init_inodecache(void)
93 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
94 sizeof(struct iso_inode_info),
95 0, (SLAB_RECLAIM_ACCOUNT|
96 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
98 if (!isofs_inode_cachep)
103 static void destroy_inodecache(void)
106 * Make sure all delayed rcu free inodes are flushed before we
110 kmem_cache_destroy(isofs_inode_cachep);
113 static int isofs_remount(struct super_block *sb, int *flags, char *data)
116 if (!(*flags & SB_RDONLY))
121 static const struct super_operations isofs_sops = {
122 .alloc_inode = isofs_alloc_inode,
123 .free_inode = isofs_free_inode,
124 .put_super = isofs_put_super,
125 .statfs = isofs_statfs,
126 .remount_fs = isofs_remount,
127 .show_options = isofs_show_options,
131 static const struct dentry_operations isofs_dentry_ops[] = {
133 .d_hash = isofs_hashi,
134 .d_compare = isofs_dentry_cmpi,
138 .d_hash = isofs_hash_ms,
139 .d_compare = isofs_dentry_cmp_ms,
142 .d_hash = isofs_hashi_ms,
143 .d_compare = isofs_dentry_cmpi_ms,
148 struct iso9660_options{
150 unsigned int joliet:1;
151 unsigned int cruft:1;
153 unsigned int showassoc:1;
154 unsigned int nocompress:1;
155 unsigned int overriderockperm:1;
156 unsigned int uid_set:1;
157 unsigned int gid_set:1;
161 unsigned int blocksize;
173 * Compute the hash for the isofs name corresponding to the dentry.
176 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
186 while (len && name[len-1] == '.')
190 hash = init_name_hash(dentry);
192 c = tolower(*name++);
193 hash = partial_name_hash(c, hash);
195 qstr->hash = end_name_hash(hash);
201 * Compare of two isofs names.
203 static int isofs_dentry_cmp_common(
204 unsigned int len, const char *str,
205 const struct qstr *name, int ms, int ci)
209 /* A filename cannot end in '.' or we treat it like it has none */
213 while (alen && name->name[alen-1] == '.')
215 while (blen && str[blen-1] == '.')
220 if (strncasecmp(name->name, str, alen) == 0)
223 if (strncmp(name->name, str, alen) == 0)
231 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
233 return isofs_hashi_common(dentry, qstr, 0);
237 isofs_dentry_cmpi(const struct dentry *dentry,
238 unsigned int len, const char *str, const struct qstr *name)
240 return isofs_dentry_cmp_common(len, str, name, 0, 1);
245 * Compute the hash for the isofs name corresponding to the dentry.
248 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
256 while (len && name[len-1] == '.')
260 qstr->hash = full_name_hash(dentry, name, len);
266 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
268 return isofs_hash_common(dentry, qstr, 1);
272 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
274 return isofs_hashi_common(dentry, qstr, 1);
278 isofs_dentry_cmp_ms(const struct dentry *dentry,
279 unsigned int len, const char *str, const struct qstr *name)
281 return isofs_dentry_cmp_common(len, str, name, 1, 0);
285 isofs_dentry_cmpi_ms(const struct dentry *dentry,
286 unsigned int len, const char *str, const struct qstr *name)
288 return isofs_dentry_cmp_common(len, str, name, 1, 1);
293 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
294 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
295 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
296 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
299 static const match_table_t tokens = {
300 {Opt_norock, "norock"},
301 {Opt_nojoliet, "nojoliet"},
302 {Opt_unhide, "unhide"},
304 {Opt_showassoc, "showassoc"},
305 {Opt_cruft, "cruft"},
307 {Opt_iocharset, "iocharset=%s"},
308 {Opt_map_a, "map=acorn"},
309 {Opt_map_a, "map=a"},
310 {Opt_map_n, "map=normal"},
311 {Opt_map_n, "map=n"},
312 {Opt_map_o, "map=off"},
313 {Opt_map_o, "map=o"},
314 {Opt_session, "session=%u"},
315 {Opt_sb, "sbsector=%u"},
316 {Opt_check_r, "check=relaxed"},
317 {Opt_check_r, "check=r"},
318 {Opt_check_s, "check=strict"},
319 {Opt_check_s, "check=s"},
322 {Opt_mode, "mode=%u"},
323 {Opt_dmode, "dmode=%u"},
324 {Opt_overriderockperm, "overriderockperm"},
325 {Opt_block, "block=%u"},
326 {Opt_ignore, "conv=binary"},
327 {Opt_ignore, "conv=b"},
328 {Opt_ignore, "conv=text"},
329 {Opt_ignore, "conv=t"},
330 {Opt_ignore, "conv=mtext"},
331 {Opt_ignore, "conv=m"},
332 {Opt_ignore, "conv=auto"},
333 {Opt_ignore, "conv=a"},
334 {Opt_nocompress, "nocompress"},
338 static int parse_options(char *options, struct iso9660_options *popt)
349 popt->check = 'u'; /* unset */
350 popt->nocompress = 0;
351 popt->blocksize = 1024;
352 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
355 popt->gid = GLOBAL_ROOT_GID;
356 popt->uid = GLOBAL_ROOT_UID;
357 popt->iocharset = NULL;
359 popt->overriderockperm = 0;
365 while ((p = strsep(&options, ",")) != NULL) {
367 substring_t args[MAX_OPT_ARGS];
373 token = match_token(p, tokens, args);
396 kfree(popt->iocharset);
397 popt->iocharset = match_strdup(&args[0]);
398 if (!popt->iocharset)
412 if (match_int(&args[0], &option))
416 * Track numbers are supposed to be in range 1-99, the
417 * mount option starts indexing at 0.
421 popt->session = n + 1;
424 if (match_int(&args[0], &option))
426 popt->sbsector = option;
437 if (match_int(&args[0], &option))
439 popt->uid = make_kuid(current_user_ns(), option);
440 if (!uid_valid(popt->uid))
445 if (match_int(&args[0], &option))
447 popt->gid = make_kgid(current_user_ns(), option);
448 if (!gid_valid(popt->gid))
453 if (match_int(&args[0], &option))
455 popt->fmode = option;
458 if (match_int(&args[0], &option))
460 popt->dmode = option;
462 case Opt_overriderockperm:
463 popt->overriderockperm = 1;
466 if (match_int(&args[0], &option))
469 if (n != 512 && n != 1024 && n != 2048)
474 popt->nocompress = 1;
484 * Display the mount options in /proc/mounts.
486 static int isofs_show_options(struct seq_file *m, struct dentry *root)
488 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
490 if (!sbi->s_rock) seq_puts(m, ",norock");
491 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
492 if (sbi->s_cruft) seq_puts(m, ",cruft");
493 if (sbi->s_hide) seq_puts(m, ",hide");
494 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
495 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
496 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
497 if (sbi->s_utf8) seq_puts(m, ",utf8");
499 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
500 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
501 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
502 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
504 if (root->d_sb->s_blocksize != 1024)
505 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
508 seq_printf(m, ",uid=%u",
509 from_kuid_munged(&init_user_ns, sbi->s_uid));
511 seq_printf(m, ",gid=%u",
512 from_kgid_munged(&init_user_ns, sbi->s_gid));
514 if (sbi->s_dmode != ISOFS_INVALID_MODE)
515 seq_printf(m, ",dmode=%o", sbi->s_dmode);
516 if (sbi->s_fmode != ISOFS_INVALID_MODE)
517 seq_printf(m, ",fmode=%o", sbi->s_fmode);
520 if (sbi->s_nls_iocharset &&
521 strcmp(sbi->s_nls_iocharset->charset, CONFIG_NLS_DEFAULT) != 0)
522 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
528 * look if the driver can tell the multi session redirection value
530 * don't change this if you don't know what you do, please!
531 * Multisession is legal only with XA disks.
532 * A non-XA disk with more than one volume descriptor may do it right, but
533 * usually is written in a nowhere standardized "multi-partition" manner.
534 * Multisession uses absolute addressing (solely the first frame of the whole
535 * track is #0), multi-partition uses relative addressing (each first frame of
536 * each track is #0), and a track is not a session.
538 * A broken CDwriter software or drive firmware does not set new standards,
539 * at least not if conflicting with the existing ones.
543 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
545 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
547 struct cdrom_multisession ms_info;
548 unsigned int vol_desc_start;
549 struct block_device *bdev = sb->s_bdev;
553 ms_info.addr_format=CDROM_LBA;
555 struct cdrom_tocentry Te;
556 Te.cdte_track=session;
557 Te.cdte_format=CDROM_LBA;
558 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
560 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
561 session, Te.cdte_addr.lba,
562 Te.cdte_ctrl&CDROM_DATA_TRACK);
563 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
564 return Te.cdte_addr.lba;
567 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
569 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
571 printk(KERN_ERR "ISOFS: Invalid session number\n");
573 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
575 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
576 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
580 #if WE_OBEY_THE_WRITTEN_STANDARDS
581 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
583 vol_desc_start=ms_info.addr.lba;
584 return vol_desc_start;
588 * Check if root directory is empty (has less than 3 files).
590 * Used to detect broken CDs where ISO root directory is empty but Joliet root
591 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
592 * (and Joliet used instead) or else no files would be visible.
594 static bool rootdir_empty(struct super_block *sb, unsigned long block)
596 int offset = 0, files = 0, de_len;
597 struct iso_directory_record *de;
598 struct buffer_head *bh;
600 bh = sb_bread(sb, block);
604 de = (struct iso_directory_record *) (bh->b_data + offset);
605 de_len = *(unsigned char *) de;
616 * Initialize the superblock and read the root inode.
618 * Note: a check_disk_change() has been done immediately prior
619 * to this call, so we don't need to check again.
621 static int isofs_fill_super(struct super_block *s, void *data, int silent)
623 struct buffer_head *bh = NULL, *pri_bh = NULL;
624 struct hs_primary_descriptor *h_pri = NULL;
625 struct iso_primary_descriptor *pri = NULL;
626 struct iso_supplementary_descriptor *sec = NULL;
627 struct iso_directory_record *rootp;
629 struct iso9660_options opt;
630 struct isofs_sb_info *sbi;
631 unsigned long first_data_zone;
632 int joliet_level = 0;
633 int iso_blknum, block;
635 int table, error = -EINVAL;
636 unsigned int vol_desc_start;
638 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
643 if (!parse_options((char *)data, &opt))
647 * First of all, get the hardware blocksize for this device.
648 * If we don't know what it is, or the hardware blocksize is
649 * larger than the blocksize the user specified, then use
653 * What if bugger tells us to go beyond page size?
655 if (bdev_logical_block_size(s->s_bdev) > 2048) {
657 "ISOFS: unsupported/invalid hardware sector size %d\n",
658 bdev_logical_block_size(s->s_bdev));
661 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
663 sbi->s_high_sierra = 0; /* default is iso9660 */
664 sbi->s_session = opt.session;
665 sbi->s_sbsector = opt.sbsector;
667 vol_desc_start = (opt.sbsector != -1) ?
668 opt.sbsector : isofs_get_last_session(s,opt.session);
670 for (iso_blknum = vol_desc_start+16;
671 iso_blknum < vol_desc_start+100; iso_blknum++) {
672 struct hs_volume_descriptor *hdp;
673 struct iso_volume_descriptor *vdp;
675 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
676 if (!(bh = sb_bread(s, block)))
679 vdp = (struct iso_volume_descriptor *)bh->b_data;
680 hdp = (struct hs_volume_descriptor *)bh->b_data;
683 * Due to the overlapping physical location of the descriptors,
684 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
685 * proper identification in this case, we first check for ISO.
687 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
688 if (isonum_711(vdp->type) == ISO_VD_END)
690 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
692 pri = (struct iso_primary_descriptor *)vdp;
693 /* Save the buffer in case we need it ... */
699 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
700 sec = (struct iso_supplementary_descriptor *)vdp;
701 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
703 if (sec->escape[2] == 0x40)
705 else if (sec->escape[2] == 0x43)
707 else if (sec->escape[2] == 0x45)
710 printk(KERN_DEBUG "ISO 9660 Extensions: "
711 "Microsoft Joliet Level %d\n",
716 /* Unknown supplementary volume descriptor */
722 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
723 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
726 sbi->s_high_sierra = 1;
728 h_pri = (struct hs_primary_descriptor *)vdp;
733 /* Just skip any volume descriptors we don't recognize */
739 * If we fall through, either no volume descriptor was found,
740 * or else we passed a primary descriptor looking for others.
743 goto out_unknown_format;
749 /* We don't support read-write mounts */
755 if (joliet_level && (!pri || !opt.rock)) {
756 /* This is the case of Joliet with the norock mount flag.
757 * A disc with both Joliet and Rock Ridge is handled later
759 pri = (struct iso_primary_descriptor *) sec;
762 if(sbi->s_high_sierra){
763 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
764 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
765 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
766 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
770 rootp = (struct iso_directory_record *) pri->root_directory_record;
771 sbi->s_nzones = isonum_733(pri->volume_space_size);
772 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
773 sbi->s_max_size = isonum_733(pri->volume_space_size);
776 sbi->s_ninodes = 0; /* No way to figure this out easily */
778 orig_zonesize = sbi->s_log_zone_size;
780 * If the zone size is smaller than the hardware sector size,
781 * this is a fatal error. This would occur if the disc drive
782 * had sectors that were 2048 bytes, but the filesystem had
783 * blocks that were 512 bytes (which should only very rarely
786 if (orig_zonesize < opt.blocksize)
789 /* RDE: convert log zone size to bit shift */
790 switch (sbi->s_log_zone_size) {
791 case 512: sbi->s_log_zone_size = 9; break;
792 case 1024: sbi->s_log_zone_size = 10; break;
793 case 2048: sbi->s_log_zone_size = 11; break;
796 goto out_bad_zone_size;
799 s->s_magic = ISOFS_SUPER_MAGIC;
802 * With multi-extent files, file size is only limited by the maximum
803 * size of a file system, which is 8 TB.
805 s->s_maxbytes = 0x80000000000LL;
807 /* ECMA-119 timestamp from 1900/1/1 with tz offset */
808 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
809 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
811 /* Set this for reference. Its not currently used except on write
812 which we don't have .. */
814 first_data_zone = isonum_733(rootp->extent) +
815 isonum_711(rootp->ext_attr_length);
816 sbi->s_firstdatazone = first_data_zone;
818 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
819 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
820 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
821 if(sbi->s_high_sierra)
822 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
826 * If the Joliet level is set, we _may_ decide to use the
827 * secondary descriptor, but can't be sure until after we
828 * read the root inode. But before reading the root inode
829 * we may need to change the device blocksize, and would
830 * rather release the old buffer first. So, we cache the
831 * first_data_zone value from the secondary descriptor.
834 pri = (struct iso_primary_descriptor *) sec;
835 rootp = (struct iso_directory_record *)
836 pri->root_directory_record;
837 first_data_zone = isonum_733(rootp->extent) +
838 isonum_711(rootp->ext_attr_length);
842 * We're all done using the volume descriptor, and may need
843 * to change the device blocksize, so release the buffer now.
849 * Force the blocksize to 512 for 512 byte sectors. The file
850 * read primitives really get it wrong in a bad way if we don't
853 * Note - we should never be setting the blocksize to something
854 * less than the hardware sector size for the device. If we
855 * do, we would end up having to read larger buffers and split
856 * out portions to satisfy requests.
858 * Note2- the idea here is that we want to deal with the optimal
859 * zonesize in the filesystem. If we have it set to something less,
860 * then we have horrible problems with trying to piece together
861 * bits of adjacent blocks in order to properly read directory
862 * entries. By forcing the blocksize in this way, we ensure
863 * that we will never be required to do this.
865 sb_set_blocksize(s, orig_zonesize);
867 sbi->s_nls_iocharset = NULL;
870 if (joliet_level && opt.utf8 == 0) {
871 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
872 sbi->s_nls_iocharset = load_nls(p);
873 if (! sbi->s_nls_iocharset) {
874 /* Fail only if explicit charset specified */
877 sbi->s_nls_iocharset = load_nls_default();
881 s->s_op = &isofs_sops;
882 s->s_export_op = &isofs_export_ops;
883 sbi->s_mapping = opt.map;
884 sbi->s_rock = (opt.rock ? 2 : 0);
885 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
886 sbi->s_cruft = opt.cruft;
887 sbi->s_hide = opt.hide;
888 sbi->s_showassoc = opt.showassoc;
889 sbi->s_uid = opt.uid;
890 sbi->s_gid = opt.gid;
891 sbi->s_uid_set = opt.uid_set;
892 sbi->s_gid_set = opt.gid_set;
893 sbi->s_utf8 = opt.utf8;
894 sbi->s_nocompress = opt.nocompress;
895 sbi->s_overriderockperm = opt.overriderockperm;
897 * It would be incredibly stupid to allow people to mark every file
898 * on the disk as suid, so we merely allow them to set the default
901 if (opt.fmode != ISOFS_INVALID_MODE)
902 sbi->s_fmode = opt.fmode & 0777;
904 sbi->s_fmode = ISOFS_INVALID_MODE;
905 if (opt.dmode != ISOFS_INVALID_MODE)
906 sbi->s_dmode = opt.dmode & 0777;
908 sbi->s_dmode = ISOFS_INVALID_MODE;
911 * Read the root inode, which _may_ result in changing
912 * the s_rock flag. Once we have the final s_rock value,
913 * we then decide whether to use the Joliet descriptor.
915 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
920 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
921 * correct Joliet root directory.
923 if (sbi->s_rock == 1 && joliet_level &&
924 rootdir_empty(s, sbi->s_firstdatazone)) {
926 "ISOFS: primary root directory is empty. "
927 "Disabling Rock Ridge and switching to Joliet.");
932 * If this disk has both Rock Ridge and Joliet on it, then we
933 * want to use Rock Ridge by default. This can be overridden
934 * by using the norock mount option. There is still one other
935 * possibility that is not taken into account: a Rock Ridge
936 * CD with Unicode names. Until someone sees such a beast, it
937 * will not be supported.
939 if (sbi->s_rock == 1) {
941 } else if (joliet_level) {
943 if (sbi->s_firstdatazone != first_data_zone) {
944 sbi->s_firstdatazone = first_data_zone;
946 "ISOFS: changing to secondary root\n");
948 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
954 if (opt.check == 'u') {
955 /* Only Joliet is case insensitive by default */
961 sbi->s_joliet_level = joliet_level;
963 /* Make sure the root inode is a directory */
964 if (!S_ISDIR(inode->i_mode)) {
966 "isofs_fill_super: root inode is not a directory. "
967 "Corrupted media?\n");
974 if (opt.check == 'r')
976 sbi->s_check = opt.check;
979 s->s_d_op = &isofs_dentry_ops[table - 1];
981 /* get the root dentry */
982 s->s_root = d_make_root(inode);
988 kfree(opt.iocharset);
993 * Display error messages and free resources.
999 error = PTR_ERR(inode);
1000 if (error != -ENOMEM)
1001 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
1003 #ifdef CONFIG_JOLIET
1004 unload_nls(sbi->s_nls_iocharset);
1008 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1009 __func__, s->s_id, iso_blknum, block);
1012 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1013 sbi->s_log_zone_size);
1016 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1017 orig_zonesize, opt.blocksize);
1021 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1027 kfree(opt.iocharset);
1029 s->s_fs_info = NULL;
1033 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1035 struct super_block *sb = dentry->d_sb;
1036 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1038 buf->f_type = ISOFS_SUPER_MAGIC;
1039 buf->f_bsize = sb->s_blocksize;
1040 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1041 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1044 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1046 buf->f_fsid.val[0] = (u32)id;
1047 buf->f_fsid.val[1] = (u32)(id >> 32);
1048 buf->f_namelen = NAME_MAX;
1053 * Get a set of blocks; filling in buffer_heads if already allocated
1054 * or getblk() if they are not. Returns the number of blocks inserted
1057 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1058 struct buffer_head **bh, unsigned long nblocks)
1060 unsigned long b_off = iblock;
1061 unsigned offset, sect_size;
1062 unsigned int firstext;
1063 unsigned long nextblk, nextoff;
1064 int section, rv, error;
1065 struct iso_inode_info *ei = ISOFS_I(inode);
1069 if (iblock != b_off) {
1070 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1076 firstext = ei->i_first_extent;
1077 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1078 nextblk = ei->i_next_section_block;
1079 nextoff = ei->i_next_section_offset;
1083 /* If we are *way* beyond the end of the file, print a message.
1084 * Access beyond the end of the file up to the next page boundary
1085 * is normal, however because of the way the page cache works.
1086 * In this case, we just return 0 so that we can properly fill
1087 * the page with useless information without generating any
1090 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1091 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1093 (unsigned long long)inode->i_size);
1097 /* On the last section, nextblk == 0, section size is likely to
1098 * exceed sect_size by a partial block, and access beyond the
1099 * end of the file will reach beyond the section size, too.
1101 while (nextblk && (b_off >= (offset + sect_size))) {
1102 struct inode *ninode;
1104 offset += sect_size;
1105 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1106 if (IS_ERR(ninode)) {
1107 error = PTR_ERR(ninode);
1110 firstext = ISOFS_I(ninode)->i_first_extent;
1111 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1112 nextblk = ISOFS_I(ninode)->i_next_section_block;
1113 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1116 if (++section > 100) {
1117 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1118 " aborting...\n", __func__);
1119 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1120 "nextblk=%lu nextoff=%lu\n", __func__,
1121 b_off, firstext, (unsigned) sect_size,
1128 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1130 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1134 bh++; /* Next buffer head */
1135 b_off++; /* Next buffer offset */
1142 return rv != 0 ? rv : error;
1146 * Used by the standard interfaces.
1148 static int isofs_get_block(struct inode *inode, sector_t iblock,
1149 struct buffer_head *bh_result, int create)
1154 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1158 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1159 return ret < 0 ? ret : 0;
1162 static int isofs_bmap(struct inode *inode, sector_t block)
1164 struct buffer_head dummy;
1168 dummy.b_blocknr = -1000;
1169 error = isofs_get_block(inode, block, &dummy, 0);
1171 return dummy.b_blocknr;
1175 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1177 sector_t blknr = isofs_bmap(inode, block);
1180 return sb_bread(inode->i_sb, blknr);
1183 static int isofs_readpage(struct file *file, struct page *page)
1185 return mpage_readpage(page, isofs_get_block);
1188 static int isofs_readpages(struct file *file, struct address_space *mapping,
1189 struct list_head *pages, unsigned nr_pages)
1191 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1194 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1196 return generic_block_bmap(mapping,block,isofs_get_block);
1199 static const struct address_space_operations isofs_aops = {
1200 .readpage = isofs_readpage,
1201 .readpages = isofs_readpages,
1205 static int isofs_read_level3_size(struct inode *inode)
1207 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1208 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1209 struct buffer_head *bh = NULL;
1210 unsigned long block, offset, block_saved, offset_saved;
1212 int more_entries = 0;
1213 struct iso_directory_record *tmpde = NULL;
1214 struct iso_inode_info *ei = ISOFS_I(inode);
1218 /* The first 16 blocks are reserved as the System Area. Thus,
1219 * no inodes can appear in block 0. We use this to flag that
1220 * this is the last section. */
1221 ei->i_next_section_block = 0;
1222 ei->i_next_section_offset = 0;
1224 block = ei->i_iget5_block;
1225 offset = ei->i_iget5_offset;
1228 struct iso_directory_record *de;
1229 unsigned int de_len;
1232 bh = sb_bread(inode->i_sb, block);
1236 de = (struct iso_directory_record *) (bh->b_data + offset);
1237 de_len = *(unsigned char *) de;
1247 block_saved = block;
1248 offset_saved = offset;
1251 /* Make sure we have a full directory entry */
1252 if (offset >= bufsize) {
1253 int slop = bufsize - offset + de_len;
1255 tmpde = kmalloc(256, GFP_KERNEL);
1259 memcpy(tmpde, de, slop);
1260 offset &= bufsize - 1;
1265 bh = sb_bread(inode->i_sb, block);
1268 memcpy((void *)tmpde+slop, bh->b_data, offset);
1273 inode->i_size += isonum_733(de->size);
1275 ei->i_next_section_block = block_saved;
1276 ei->i_next_section_offset = offset_saved;
1279 more_entries = de->flags[-high_sierra] & 0x80;
1284 } while (more_entries);
1297 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1302 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1303 "isofs_read_level3_size: inode=%lu\n",
1304 __func__, inode->i_ino);
1308 static int isofs_read_inode(struct inode *inode, int relocated)
1310 struct super_block *sb = inode->i_sb;
1311 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1312 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1313 unsigned long block;
1314 int high_sierra = sbi->s_high_sierra;
1315 struct buffer_head *bh;
1316 struct iso_directory_record *de;
1317 struct iso_directory_record *tmpde = NULL;
1318 unsigned int de_len;
1319 unsigned long offset;
1320 struct iso_inode_info *ei = ISOFS_I(inode);
1323 block = ei->i_iget5_block;
1324 bh = sb_bread(inode->i_sb, block);
1328 offset = ei->i_iget5_offset;
1330 de = (struct iso_directory_record *) (bh->b_data + offset);
1331 de_len = *(unsigned char *) de;
1333 if (offset + de_len > bufsize) {
1334 int frag1 = bufsize - offset;
1336 tmpde = kmalloc(de_len, GFP_KERNEL);
1341 memcpy(tmpde, bh->b_data + offset, frag1);
1343 bh = sb_bread(inode->i_sb, ++block);
1346 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1350 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1352 ISOFS_BUFFER_BITS(inode));
1354 /* Assume it is a normal-format file unless told otherwise */
1355 ei->i_file_format = isofs_file_normal;
1357 if (de->flags[-high_sierra] & 2) {
1358 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1359 inode->i_mode = S_IFDIR | sbi->s_dmode;
1361 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1362 set_nlink(inode, 1); /*
1363 * Set to 1. We know there are 2, but
1364 * the find utility tries to optimize
1365 * if it is 2, and it screws up. It is
1366 * easier to give 1 which tells find to
1367 * do it the hard way.
1370 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1371 inode->i_mode = S_IFREG | sbi->s_fmode;
1374 * Set default permissions: r-x for all. The disc
1375 * could be shared with DOS machines so virtually
1376 * anything could be a valid executable.
1378 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1380 set_nlink(inode, 1);
1382 inode->i_uid = sbi->s_uid;
1383 inode->i_gid = sbi->s_gid;
1384 inode->i_blocks = 0;
1386 ei->i_format_parm[0] = 0;
1387 ei->i_format_parm[1] = 0;
1388 ei->i_format_parm[2] = 0;
1390 ei->i_section_size = isonum_733(de->size);
1391 if (de->flags[-high_sierra] & 0x80) {
1392 ret = isofs_read_level3_size(inode);
1397 ei->i_next_section_block = 0;
1398 ei->i_next_section_offset = 0;
1399 inode->i_size = isonum_733(de->size);
1403 * Some dipshit decided to store some other bit of information
1404 * in the high byte of the file length. Truncate size in case
1405 * this CDROM was mounted with the cruft option.
1409 inode->i_size &= 0x00ffffff;
1411 if (de->interleave[0]) {
1412 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1416 /* I have no idea what file_unit_size is used for, so
1417 we will flag it for now */
1418 if (de->file_unit_size[0] != 0) {
1419 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1423 /* I have no idea what other flag bits are used for, so
1424 we will flag it for now */
1426 if((de->flags[-high_sierra] & ~2)!= 0){
1427 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1429 inode->i_ino, de->flags[-high_sierra]);
1433 inode->i_mtime.tv_sec =
1434 inode->i_atime.tv_sec =
1435 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1436 inode->i_mtime.tv_nsec =
1437 inode->i_atime.tv_nsec =
1438 inode->i_ctime.tv_nsec = 0;
1440 ei->i_first_extent = (isonum_733(de->extent) +
1441 isonum_711(de->ext_attr_length));
1443 /* Set the number of blocks for stat() - should be done before RR */
1444 inode->i_blocks = (inode->i_size + 511) >> 9;
1447 * Now test for possible Rock Ridge extensions which will override
1448 * some of these numbers in the inode structure.
1452 parse_rock_ridge_inode(de, inode, relocated);
1453 /* if we want uid/gid set, override the rock ridge setting */
1455 inode->i_uid = sbi->s_uid;
1457 inode->i_gid = sbi->s_gid;
1459 /* Now set final access rights if overriding rock ridge setting */
1460 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1461 sbi->s_dmode != ISOFS_INVALID_MODE)
1462 inode->i_mode = S_IFDIR | sbi->s_dmode;
1463 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1464 sbi->s_fmode != ISOFS_INVALID_MODE)
1465 inode->i_mode = S_IFREG | sbi->s_fmode;
1467 /* Install the inode operations vector */
1468 if (S_ISREG(inode->i_mode)) {
1469 inode->i_fop = &generic_ro_fops;
1470 switch (ei->i_file_format) {
1471 #ifdef CONFIG_ZISOFS
1472 case isofs_file_compressed:
1473 inode->i_data.a_ops = &zisofs_aops;
1477 inode->i_data.a_ops = &isofs_aops;
1480 } else if (S_ISDIR(inode->i_mode)) {
1481 inode->i_op = &isofs_dir_inode_operations;
1482 inode->i_fop = &isofs_dir_operations;
1483 } else if (S_ISLNK(inode->i_mode)) {
1484 inode->i_op = &page_symlink_inode_operations;
1485 inode_nohighmem(inode);
1486 inode->i_data.a_ops = &isofs_symlink_aops;
1488 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1489 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1499 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1504 struct isofs_iget5_callback_data {
1505 unsigned long block;
1506 unsigned long offset;
1509 static int isofs_iget5_test(struct inode *ino, void *data)
1511 struct iso_inode_info *i = ISOFS_I(ino);
1512 struct isofs_iget5_callback_data *d =
1513 (struct isofs_iget5_callback_data*)data;
1514 return (i->i_iget5_block == d->block)
1515 && (i->i_iget5_offset == d->offset);
1518 static int isofs_iget5_set(struct inode *ino, void *data)
1520 struct iso_inode_info *i = ISOFS_I(ino);
1521 struct isofs_iget5_callback_data *d =
1522 (struct isofs_iget5_callback_data*)data;
1523 i->i_iget5_block = d->block;
1524 i->i_iget5_offset = d->offset;
1528 /* Store, in the inode's containing structure, the block and block
1529 * offset that point to the underlying meta-data for the inode. The
1530 * code below is otherwise similar to the iget() code in
1531 * include/linux/fs.h */
1532 struct inode *__isofs_iget(struct super_block *sb,
1533 unsigned long block,
1534 unsigned long offset,
1537 unsigned long hashval;
1538 struct inode *inode;
1539 struct isofs_iget5_callback_data data;
1542 if (offset >= 1ul << sb->s_blocksize_bits)
1543 return ERR_PTR(-EINVAL);
1546 data.offset = offset;
1548 hashval = (block << sb->s_blocksize_bits) | offset;
1550 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1551 &isofs_iget5_set, &data);
1554 return ERR_PTR(-ENOMEM);
1556 if (inode->i_state & I_NEW) {
1557 ret = isofs_read_inode(inode, relocated);
1560 inode = ERR_PTR(ret);
1562 unlock_new_inode(inode);
1569 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1570 int flags, const char *dev_name, void *data)
1572 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1575 static struct file_system_type iso9660_fs_type = {
1576 .owner = THIS_MODULE,
1578 .mount = isofs_mount,
1579 .kill_sb = kill_block_super,
1580 .fs_flags = FS_REQUIRES_DEV,
1582 MODULE_ALIAS_FS("iso9660");
1583 MODULE_ALIAS("iso9660");
1585 static int __init init_iso9660_fs(void)
1587 int err = init_inodecache();
1590 #ifdef CONFIG_ZISOFS
1591 err = zisofs_init();
1595 err = register_filesystem(&iso9660_fs_type);
1600 #ifdef CONFIG_ZISOFS
1604 destroy_inodecache();
1609 static void __exit exit_iso9660_fs(void)
1611 unregister_filesystem(&iso9660_fs_type);
1612 #ifdef CONFIG_ZISOFS
1615 destroy_inodecache();
1618 module_init(init_iso9660_fs)
1619 module_exit(exit_iso9660_fs)
1620 MODULE_LICENSE("GPL");