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>
35 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
36 static int isofs_dentry_cmpi(const struct dentry *dentry,
37 unsigned int len, const char *str, const struct qstr *name);
40 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
41 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
42 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
43 unsigned int len, const char *str, const struct qstr *name);
44 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
45 unsigned int len, const char *str, const struct qstr *name);
48 static void isofs_put_super(struct super_block *sb)
50 struct isofs_sb_info *sbi = ISOFS_SB(sb);
53 unload_nls(sbi->s_nls_iocharset);
61 static int isofs_read_inode(struct inode *, int relocated);
62 static int isofs_statfs (struct dentry *, struct kstatfs *);
63 static int isofs_show_options(struct seq_file *, struct dentry *);
65 static struct kmem_cache *isofs_inode_cachep;
67 static struct inode *isofs_alloc_inode(struct super_block *sb)
69 struct iso_inode_info *ei;
70 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
73 return &ei->vfs_inode;
76 static void isofs_free_inode(struct inode *inode)
78 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
81 static void init_once(void *foo)
83 struct iso_inode_info *ei = foo;
85 inode_init_once(&ei->vfs_inode);
88 static int __init init_inodecache(void)
90 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
91 sizeof(struct iso_inode_info),
92 0, (SLAB_RECLAIM_ACCOUNT|
93 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
95 if (!isofs_inode_cachep)
100 static void destroy_inodecache(void)
103 * Make sure all delayed rcu free inodes are flushed before we
107 kmem_cache_destroy(isofs_inode_cachep);
110 static int isofs_remount(struct super_block *sb, int *flags, char *data)
113 if (!(*flags & SB_RDONLY))
118 static const struct super_operations isofs_sops = {
119 .alloc_inode = isofs_alloc_inode,
120 .free_inode = isofs_free_inode,
121 .put_super = isofs_put_super,
122 .statfs = isofs_statfs,
123 .remount_fs = isofs_remount,
124 .show_options = isofs_show_options,
128 static const struct dentry_operations isofs_dentry_ops[] = {
130 .d_hash = isofs_hashi,
131 .d_compare = isofs_dentry_cmpi,
135 .d_hash = isofs_hash_ms,
136 .d_compare = isofs_dentry_cmp_ms,
139 .d_hash = isofs_hashi_ms,
140 .d_compare = isofs_dentry_cmpi_ms,
145 struct iso9660_options{
147 unsigned int joliet:1;
148 unsigned int cruft:1;
150 unsigned int showassoc:1;
151 unsigned int nocompress:1;
152 unsigned int overriderockperm:1;
153 unsigned int uid_set:1;
154 unsigned int gid_set:1;
158 unsigned int blocksize;
170 * Compute the hash for the isofs name corresponding to the dentry.
173 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
183 while (len && name[len-1] == '.')
187 hash = init_name_hash(dentry);
189 c = tolower(*name++);
190 hash = partial_name_hash(c, hash);
192 qstr->hash = end_name_hash(hash);
198 * Compare of two isofs names.
200 static int isofs_dentry_cmp_common(
201 unsigned int len, const char *str,
202 const struct qstr *name, int ms, int ci)
206 /* A filename cannot end in '.' or we treat it like it has none */
210 while (alen && name->name[alen-1] == '.')
212 while (blen && str[blen-1] == '.')
217 if (strncasecmp(name->name, str, alen) == 0)
220 if (strncmp(name->name, str, alen) == 0)
228 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
230 return isofs_hashi_common(dentry, qstr, 0);
234 isofs_dentry_cmpi(const struct dentry *dentry,
235 unsigned int len, const char *str, const struct qstr *name)
237 return isofs_dentry_cmp_common(len, str, name, 0, 1);
242 * Compute the hash for the isofs name corresponding to the dentry.
245 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
253 while (len && name[len-1] == '.')
257 qstr->hash = full_name_hash(dentry, name, len);
263 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
265 return isofs_hash_common(dentry, qstr, 1);
269 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
271 return isofs_hashi_common(dentry, qstr, 1);
275 isofs_dentry_cmp_ms(const struct dentry *dentry,
276 unsigned int len, const char *str, const struct qstr *name)
278 return isofs_dentry_cmp_common(len, str, name, 1, 0);
282 isofs_dentry_cmpi_ms(const struct dentry *dentry,
283 unsigned int len, const char *str, const struct qstr *name)
285 return isofs_dentry_cmp_common(len, str, name, 1, 1);
290 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
291 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
292 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
293 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
296 static const match_table_t tokens = {
297 {Opt_norock, "norock"},
298 {Opt_nojoliet, "nojoliet"},
299 {Opt_unhide, "unhide"},
301 {Opt_showassoc, "showassoc"},
302 {Opt_cruft, "cruft"},
304 {Opt_iocharset, "iocharset=%s"},
305 {Opt_map_a, "map=acorn"},
306 {Opt_map_a, "map=a"},
307 {Opt_map_n, "map=normal"},
308 {Opt_map_n, "map=n"},
309 {Opt_map_o, "map=off"},
310 {Opt_map_o, "map=o"},
311 {Opt_session, "session=%u"},
312 {Opt_sb, "sbsector=%u"},
313 {Opt_check_r, "check=relaxed"},
314 {Opt_check_r, "check=r"},
315 {Opt_check_s, "check=strict"},
316 {Opt_check_s, "check=s"},
319 {Opt_mode, "mode=%u"},
320 {Opt_dmode, "dmode=%u"},
321 {Opt_overriderockperm, "overriderockperm"},
322 {Opt_block, "block=%u"},
323 {Opt_ignore, "conv=binary"},
324 {Opt_ignore, "conv=b"},
325 {Opt_ignore, "conv=text"},
326 {Opt_ignore, "conv=t"},
327 {Opt_ignore, "conv=mtext"},
328 {Opt_ignore, "conv=m"},
329 {Opt_ignore, "conv=auto"},
330 {Opt_ignore, "conv=a"},
331 {Opt_nocompress, "nocompress"},
335 static int parse_options(char *options, struct iso9660_options *popt)
346 popt->check = 'u'; /* unset */
347 popt->nocompress = 0;
348 popt->blocksize = 1024;
349 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
352 popt->gid = GLOBAL_ROOT_GID;
353 popt->uid = GLOBAL_ROOT_UID;
354 popt->iocharset = NULL;
356 popt->overriderockperm = 0;
362 while ((p = strsep(&options, ",")) != NULL) {
364 substring_t args[MAX_OPT_ARGS];
370 token = match_token(p, tokens, args);
393 kfree(popt->iocharset);
394 popt->iocharset = match_strdup(&args[0]);
395 if (!popt->iocharset)
409 if (match_int(&args[0], &option))
413 * Track numbers are supposed to be in range 1-99, the
414 * mount option starts indexing at 0.
418 popt->session = n + 1;
421 if (match_int(&args[0], &option))
423 popt->sbsector = option;
434 if (match_int(&args[0], &option))
436 popt->uid = make_kuid(current_user_ns(), option);
437 if (!uid_valid(popt->uid))
442 if (match_int(&args[0], &option))
444 popt->gid = make_kgid(current_user_ns(), option);
445 if (!gid_valid(popt->gid))
450 if (match_int(&args[0], &option))
452 popt->fmode = option;
455 if (match_int(&args[0], &option))
457 popt->dmode = option;
459 case Opt_overriderockperm:
460 popt->overriderockperm = 1;
463 if (match_int(&args[0], &option))
466 if (n != 512 && n != 1024 && n != 2048)
471 popt->nocompress = 1;
481 * Display the mount options in /proc/mounts.
483 static int isofs_show_options(struct seq_file *m, struct dentry *root)
485 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
487 if (!sbi->s_rock) seq_puts(m, ",norock");
488 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
489 if (sbi->s_cruft) seq_puts(m, ",cruft");
490 if (sbi->s_hide) seq_puts(m, ",hide");
491 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
492 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
493 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
494 if (sbi->s_utf8) seq_puts(m, ",utf8");
496 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
497 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
498 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
499 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
501 if (root->d_sb->s_blocksize != 1024)
502 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
505 seq_printf(m, ",uid=%u",
506 from_kuid_munged(&init_user_ns, sbi->s_uid));
508 seq_printf(m, ",gid=%u",
509 from_kgid_munged(&init_user_ns, sbi->s_gid));
511 if (sbi->s_dmode != ISOFS_INVALID_MODE)
512 seq_printf(m, ",dmode=%o", sbi->s_dmode);
513 if (sbi->s_fmode != ISOFS_INVALID_MODE)
514 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);
525 * look if the driver can tell the multi session redirection value
527 * don't change this if you don't know what you do, please!
528 * Multisession is legal only with XA disks.
529 * A non-XA disk with more than one volume descriptor may do it right, but
530 * usually is written in a nowhere standardized "multi-partition" manner.
531 * Multisession uses absolute addressing (solely the first frame of the whole
532 * track is #0), multi-partition uses relative addressing (each first frame of
533 * each track is #0), and a track is not a session.
535 * A broken CDwriter software or drive firmware does not set new standards,
536 * at least not if conflicting with the existing ones.
540 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
542 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
544 struct cdrom_multisession ms_info;
545 unsigned int vol_desc_start;
546 struct block_device *bdev = sb->s_bdev;
550 ms_info.addr_format=CDROM_LBA;
552 struct cdrom_tocentry Te;
553 Te.cdte_track=session;
554 Te.cdte_format=CDROM_LBA;
555 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
557 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
558 session, Te.cdte_addr.lba,
559 Te.cdte_ctrl&CDROM_DATA_TRACK);
560 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
561 return Te.cdte_addr.lba;
564 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
566 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
568 printk(KERN_ERR "ISOFS: Invalid session number\n");
570 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
572 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
573 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
577 #if WE_OBEY_THE_WRITTEN_STANDARDS
578 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
580 vol_desc_start=ms_info.addr.lba;
581 return vol_desc_start;
585 * Check if root directory is empty (has less than 3 files).
587 * Used to detect broken CDs where ISO root directory is empty but Joliet root
588 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
589 * (and Joliet used instead) or else no files would be visible.
591 static bool rootdir_empty(struct super_block *sb, unsigned long block)
593 int offset = 0, files = 0, de_len;
594 struct iso_directory_record *de;
595 struct buffer_head *bh;
597 bh = sb_bread(sb, block);
601 de = (struct iso_directory_record *) (bh->b_data + offset);
602 de_len = *(unsigned char *) de;
613 * Initialize the superblock and read the root inode.
615 * Note: a check_disk_change() has been done immediately prior
616 * to this call, so we don't need to check again.
618 static int isofs_fill_super(struct super_block *s, void *data, int silent)
620 struct buffer_head *bh = NULL, *pri_bh = NULL;
621 struct hs_primary_descriptor *h_pri = NULL;
622 struct iso_primary_descriptor *pri = NULL;
623 struct iso_supplementary_descriptor *sec = NULL;
624 struct iso_directory_record *rootp;
626 struct iso9660_options opt;
627 struct isofs_sb_info *sbi;
628 unsigned long first_data_zone;
629 int joliet_level = 0;
630 int iso_blknum, block;
632 int table, error = -EINVAL;
633 unsigned int vol_desc_start;
635 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
640 if (!parse_options((char *)data, &opt))
644 * First of all, get the hardware blocksize for this device.
645 * If we don't know what it is, or the hardware blocksize is
646 * larger than the blocksize the user specified, then use
650 * What if bugger tells us to go beyond page size?
652 if (bdev_logical_block_size(s->s_bdev) > 2048) {
654 "ISOFS: unsupported/invalid hardware sector size %d\n",
655 bdev_logical_block_size(s->s_bdev));
658 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
660 sbi->s_high_sierra = 0; /* default is iso9660 */
661 sbi->s_session = opt.session;
662 sbi->s_sbsector = opt.sbsector;
664 vol_desc_start = (opt.sbsector != -1) ?
665 opt.sbsector : isofs_get_last_session(s,opt.session);
667 for (iso_blknum = vol_desc_start+16;
668 iso_blknum < vol_desc_start+100; iso_blknum++) {
669 struct hs_volume_descriptor *hdp;
670 struct iso_volume_descriptor *vdp;
672 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
673 if (!(bh = sb_bread(s, block)))
676 vdp = (struct iso_volume_descriptor *)bh->b_data;
677 hdp = (struct hs_volume_descriptor *)bh->b_data;
680 * Due to the overlapping physical location of the descriptors,
681 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
682 * proper identification in this case, we first check for ISO.
684 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
685 if (isonum_711(vdp->type) == ISO_VD_END)
687 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
689 pri = (struct iso_primary_descriptor *)vdp;
690 /* Save the buffer in case we need it ... */
696 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
697 sec = (struct iso_supplementary_descriptor *)vdp;
698 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
700 if (sec->escape[2] == 0x40)
702 else if (sec->escape[2] == 0x43)
704 else if (sec->escape[2] == 0x45)
707 printk(KERN_DEBUG "ISO 9660 Extensions: "
708 "Microsoft Joliet Level %d\n",
713 /* Unknown supplementary volume descriptor */
719 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
720 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
723 sbi->s_high_sierra = 1;
725 h_pri = (struct hs_primary_descriptor *)vdp;
730 /* Just skip any volume descriptors we don't recognize */
736 * If we fall through, either no volume descriptor was found,
737 * or else we passed a primary descriptor looking for others.
740 goto out_unknown_format;
746 /* We don't support read-write mounts */
752 if (joliet_level && (!pri || !opt.rock)) {
753 /* This is the case of Joliet with the norock mount flag.
754 * A disc with both Joliet and Rock Ridge is handled later
756 pri = (struct iso_primary_descriptor *) sec;
759 if(sbi->s_high_sierra){
760 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
761 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
762 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
763 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
767 rootp = (struct iso_directory_record *) pri->root_directory_record;
768 sbi->s_nzones = isonum_733(pri->volume_space_size);
769 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
770 sbi->s_max_size = isonum_733(pri->volume_space_size);
773 sbi->s_ninodes = 0; /* No way to figure this out easily */
775 orig_zonesize = sbi->s_log_zone_size;
777 * If the zone size is smaller than the hardware sector size,
778 * this is a fatal error. This would occur if the disc drive
779 * had sectors that were 2048 bytes, but the filesystem had
780 * blocks that were 512 bytes (which should only very rarely
783 if (orig_zonesize < opt.blocksize)
786 /* RDE: convert log zone size to bit shift */
787 switch (sbi->s_log_zone_size) {
788 case 512: sbi->s_log_zone_size = 9; break;
789 case 1024: sbi->s_log_zone_size = 10; break;
790 case 2048: sbi->s_log_zone_size = 11; break;
793 goto out_bad_zone_size;
796 s->s_magic = ISOFS_SUPER_MAGIC;
799 * With multi-extent files, file size is only limited by the maximum
800 * size of a file system, which is 8 TB.
802 s->s_maxbytes = 0x80000000000LL;
804 /* Set this for reference. Its not currently used except on write
805 which we don't have .. */
807 first_data_zone = isonum_733(rootp->extent) +
808 isonum_711(rootp->ext_attr_length);
809 sbi->s_firstdatazone = first_data_zone;
811 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
812 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
813 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
814 if(sbi->s_high_sierra)
815 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
819 * If the Joliet level is set, we _may_ decide to use the
820 * secondary descriptor, but can't be sure until after we
821 * read the root inode. But before reading the root inode
822 * we may need to change the device blocksize, and would
823 * rather release the old buffer first. So, we cache the
824 * first_data_zone value from the secondary descriptor.
827 pri = (struct iso_primary_descriptor *) sec;
828 rootp = (struct iso_directory_record *)
829 pri->root_directory_record;
830 first_data_zone = isonum_733(rootp->extent) +
831 isonum_711(rootp->ext_attr_length);
835 * We're all done using the volume descriptor, and may need
836 * to change the device blocksize, so release the buffer now.
842 * Force the blocksize to 512 for 512 byte sectors. The file
843 * read primitives really get it wrong in a bad way if we don't
846 * Note - we should never be setting the blocksize to something
847 * less than the hardware sector size for the device. If we
848 * do, we would end up having to read larger buffers and split
849 * out portions to satisfy requests.
851 * Note2- the idea here is that we want to deal with the optimal
852 * zonesize in the filesystem. If we have it set to something less,
853 * then we have horrible problems with trying to piece together
854 * bits of adjacent blocks in order to properly read directory
855 * entries. By forcing the blocksize in this way, we ensure
856 * that we will never be required to do this.
858 sb_set_blocksize(s, orig_zonesize);
860 sbi->s_nls_iocharset = NULL;
863 if (joliet_level && opt.utf8 == 0) {
864 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
865 sbi->s_nls_iocharset = load_nls(p);
866 if (! sbi->s_nls_iocharset) {
867 /* Fail only if explicit charset specified */
870 sbi->s_nls_iocharset = load_nls_default();
874 s->s_op = &isofs_sops;
875 s->s_export_op = &isofs_export_ops;
876 sbi->s_mapping = opt.map;
877 sbi->s_rock = (opt.rock ? 2 : 0);
878 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
879 sbi->s_cruft = opt.cruft;
880 sbi->s_hide = opt.hide;
881 sbi->s_showassoc = opt.showassoc;
882 sbi->s_uid = opt.uid;
883 sbi->s_gid = opt.gid;
884 sbi->s_uid_set = opt.uid_set;
885 sbi->s_gid_set = opt.gid_set;
886 sbi->s_utf8 = opt.utf8;
887 sbi->s_nocompress = opt.nocompress;
888 sbi->s_overriderockperm = opt.overriderockperm;
890 * It would be incredibly stupid to allow people to mark every file
891 * on the disk as suid, so we merely allow them to set the default
894 if (opt.fmode != ISOFS_INVALID_MODE)
895 sbi->s_fmode = opt.fmode & 0777;
897 sbi->s_fmode = ISOFS_INVALID_MODE;
898 if (opt.dmode != ISOFS_INVALID_MODE)
899 sbi->s_dmode = opt.dmode & 0777;
901 sbi->s_dmode = ISOFS_INVALID_MODE;
904 * Read the root inode, which _may_ result in changing
905 * the s_rock flag. Once we have the final s_rock value,
906 * we then decide whether to use the Joliet descriptor.
908 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
913 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
914 * correct Joliet root directory.
916 if (sbi->s_rock == 1 && joliet_level &&
917 rootdir_empty(s, sbi->s_firstdatazone)) {
919 "ISOFS: primary root directory is empty. "
920 "Disabling Rock Ridge and switching to Joliet.");
925 * If this disk has both Rock Ridge and Joliet on it, then we
926 * want to use Rock Ridge by default. This can be overridden
927 * by using the norock mount option. There is still one other
928 * possibility that is not taken into account: a Rock Ridge
929 * CD with Unicode names. Until someone sees such a beast, it
930 * will not be supported.
932 if (sbi->s_rock == 1) {
934 } else if (joliet_level) {
936 if (sbi->s_firstdatazone != first_data_zone) {
937 sbi->s_firstdatazone = first_data_zone;
939 "ISOFS: changing to secondary root\n");
941 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
947 if (opt.check == 'u') {
948 /* Only Joliet is case insensitive by default */
954 sbi->s_joliet_level = joliet_level;
956 /* Make sure the root inode is a directory */
957 if (!S_ISDIR(inode->i_mode)) {
959 "isofs_fill_super: root inode is not a directory. "
960 "Corrupted media?\n");
967 if (opt.check == 'r')
969 sbi->s_check = opt.check;
972 s->s_d_op = &isofs_dentry_ops[table - 1];
974 /* get the root dentry */
975 s->s_root = d_make_root(inode);
981 kfree(opt.iocharset);
986 * Display error messages and free resources.
992 error = PTR_ERR(inode);
993 if (error != -ENOMEM)
994 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
997 unload_nls(sbi->s_nls_iocharset);
1001 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
1002 __func__, s->s_id, iso_blknum, block);
1005 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
1006 sbi->s_log_zone_size);
1009 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1010 orig_zonesize, opt.blocksize);
1014 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
1020 kfree(opt.iocharset);
1022 s->s_fs_info = NULL;
1026 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1028 struct super_block *sb = dentry->d_sb;
1029 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1031 buf->f_type = ISOFS_SUPER_MAGIC;
1032 buf->f_bsize = sb->s_blocksize;
1033 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1034 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1037 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1039 buf->f_fsid.val[0] = (u32)id;
1040 buf->f_fsid.val[1] = (u32)(id >> 32);
1041 buf->f_namelen = NAME_MAX;
1046 * Get a set of blocks; filling in buffer_heads if already allocated
1047 * or getblk() if they are not. Returns the number of blocks inserted
1050 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1051 struct buffer_head **bh, unsigned long nblocks)
1053 unsigned long b_off = iblock;
1054 unsigned offset, sect_size;
1055 unsigned int firstext;
1056 unsigned long nextblk, nextoff;
1057 int section, rv, error;
1058 struct iso_inode_info *ei = ISOFS_I(inode);
1062 if (iblock != b_off) {
1063 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1069 firstext = ei->i_first_extent;
1070 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1071 nextblk = ei->i_next_section_block;
1072 nextoff = ei->i_next_section_offset;
1076 /* If we are *way* beyond the end of the file, print a message.
1077 * Access beyond the end of the file up to the next page boundary
1078 * is normal, however because of the way the page cache works.
1079 * In this case, we just return 0 so that we can properly fill
1080 * the page with useless information without generating any
1083 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1084 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1086 (unsigned long long)inode->i_size);
1090 /* On the last section, nextblk == 0, section size is likely to
1091 * exceed sect_size by a partial block, and access beyond the
1092 * end of the file will reach beyond the section size, too.
1094 while (nextblk && (b_off >= (offset + sect_size))) {
1095 struct inode *ninode;
1097 offset += sect_size;
1098 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1099 if (IS_ERR(ninode)) {
1100 error = PTR_ERR(ninode);
1103 firstext = ISOFS_I(ninode)->i_first_extent;
1104 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1105 nextblk = ISOFS_I(ninode)->i_next_section_block;
1106 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1109 if (++section > 100) {
1110 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1111 " aborting...\n", __func__);
1112 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1113 "nextblk=%lu nextoff=%lu\n", __func__,
1114 b_off, firstext, (unsigned) sect_size,
1121 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1123 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1127 bh++; /* Next buffer head */
1128 b_off++; /* Next buffer offset */
1135 return rv != 0 ? rv : error;
1139 * Used by the standard interfaces.
1141 static int isofs_get_block(struct inode *inode, sector_t iblock,
1142 struct buffer_head *bh_result, int create)
1147 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1151 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1152 return ret < 0 ? ret : 0;
1155 static int isofs_bmap(struct inode *inode, sector_t block)
1157 struct buffer_head dummy;
1161 dummy.b_blocknr = -1000;
1162 error = isofs_get_block(inode, block, &dummy, 0);
1164 return dummy.b_blocknr;
1168 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1170 sector_t blknr = isofs_bmap(inode, block);
1173 return sb_bread(inode->i_sb, blknr);
1176 static int isofs_readpage(struct file *file, struct page *page)
1178 return mpage_readpage(page, isofs_get_block);
1181 static int isofs_readpages(struct file *file, struct address_space *mapping,
1182 struct list_head *pages, unsigned nr_pages)
1184 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
1187 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1189 return generic_block_bmap(mapping,block,isofs_get_block);
1192 static const struct address_space_operations isofs_aops = {
1193 .readpage = isofs_readpage,
1194 .readpages = isofs_readpages,
1198 static int isofs_read_level3_size(struct inode *inode)
1200 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1201 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1202 struct buffer_head *bh = NULL;
1203 unsigned long block, offset, block_saved, offset_saved;
1205 int more_entries = 0;
1206 struct iso_directory_record *tmpde = NULL;
1207 struct iso_inode_info *ei = ISOFS_I(inode);
1211 /* The first 16 blocks are reserved as the System Area. Thus,
1212 * no inodes can appear in block 0. We use this to flag that
1213 * this is the last section. */
1214 ei->i_next_section_block = 0;
1215 ei->i_next_section_offset = 0;
1217 block = ei->i_iget5_block;
1218 offset = ei->i_iget5_offset;
1221 struct iso_directory_record *de;
1222 unsigned int de_len;
1225 bh = sb_bread(inode->i_sb, block);
1229 de = (struct iso_directory_record *) (bh->b_data + offset);
1230 de_len = *(unsigned char *) de;
1240 block_saved = block;
1241 offset_saved = offset;
1244 /* Make sure we have a full directory entry */
1245 if (offset >= bufsize) {
1246 int slop = bufsize - offset + de_len;
1248 tmpde = kmalloc(256, GFP_KERNEL);
1252 memcpy(tmpde, de, slop);
1253 offset &= bufsize - 1;
1258 bh = sb_bread(inode->i_sb, block);
1261 memcpy((void *)tmpde+slop, bh->b_data, offset);
1266 inode->i_size += isonum_733(de->size);
1268 ei->i_next_section_block = block_saved;
1269 ei->i_next_section_offset = offset_saved;
1272 more_entries = de->flags[-high_sierra] & 0x80;
1277 } while (more_entries);
1290 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1295 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1296 "isofs_read_level3_size: inode=%lu\n",
1297 __func__, inode->i_ino);
1301 static int isofs_read_inode(struct inode *inode, int relocated)
1303 struct super_block *sb = inode->i_sb;
1304 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1305 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1306 unsigned long block;
1307 int high_sierra = sbi->s_high_sierra;
1308 struct buffer_head *bh;
1309 struct iso_directory_record *de;
1310 struct iso_directory_record *tmpde = NULL;
1311 unsigned int de_len;
1312 unsigned long offset;
1313 struct iso_inode_info *ei = ISOFS_I(inode);
1316 block = ei->i_iget5_block;
1317 bh = sb_bread(inode->i_sb, block);
1321 offset = ei->i_iget5_offset;
1323 de = (struct iso_directory_record *) (bh->b_data + offset);
1324 de_len = *(unsigned char *) de;
1326 if (offset + de_len > bufsize) {
1327 int frag1 = bufsize - offset;
1329 tmpde = kmalloc(de_len, GFP_KERNEL);
1334 memcpy(tmpde, bh->b_data + offset, frag1);
1336 bh = sb_bread(inode->i_sb, ++block);
1339 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1343 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1345 ISOFS_BUFFER_BITS(inode));
1347 /* Assume it is a normal-format file unless told otherwise */
1348 ei->i_file_format = isofs_file_normal;
1350 if (de->flags[-high_sierra] & 2) {
1351 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1352 inode->i_mode = S_IFDIR | sbi->s_dmode;
1354 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1355 set_nlink(inode, 1); /*
1356 * Set to 1. We know there are 2, but
1357 * the find utility tries to optimize
1358 * if it is 2, and it screws up. It is
1359 * easier to give 1 which tells find to
1360 * do it the hard way.
1363 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1364 inode->i_mode = S_IFREG | sbi->s_fmode;
1367 * Set default permissions: r-x for all. The disc
1368 * could be shared with DOS machines so virtually
1369 * anything could be a valid executable.
1371 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1373 set_nlink(inode, 1);
1375 inode->i_uid = sbi->s_uid;
1376 inode->i_gid = sbi->s_gid;
1377 inode->i_blocks = 0;
1379 ei->i_format_parm[0] = 0;
1380 ei->i_format_parm[1] = 0;
1381 ei->i_format_parm[2] = 0;
1383 ei->i_section_size = isonum_733(de->size);
1384 if (de->flags[-high_sierra] & 0x80) {
1385 ret = isofs_read_level3_size(inode);
1390 ei->i_next_section_block = 0;
1391 ei->i_next_section_offset = 0;
1392 inode->i_size = isonum_733(de->size);
1396 * Some dipshit decided to store some other bit of information
1397 * in the high byte of the file length. Truncate size in case
1398 * this CDROM was mounted with the cruft option.
1402 inode->i_size &= 0x00ffffff;
1404 if (de->interleave[0]) {
1405 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1409 /* I have no idea what file_unit_size is used for, so
1410 we will flag it for now */
1411 if (de->file_unit_size[0] != 0) {
1412 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1416 /* I have no idea what other flag bits are used for, so
1417 we will flag it for now */
1419 if((de->flags[-high_sierra] & ~2)!= 0){
1420 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1422 inode->i_ino, de->flags[-high_sierra]);
1426 inode->i_mtime.tv_sec =
1427 inode->i_atime.tv_sec =
1428 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1429 inode->i_mtime.tv_nsec =
1430 inode->i_atime.tv_nsec =
1431 inode->i_ctime.tv_nsec = 0;
1433 ei->i_first_extent = (isonum_733(de->extent) +
1434 isonum_711(de->ext_attr_length));
1436 /* Set the number of blocks for stat() - should be done before RR */
1437 inode->i_blocks = (inode->i_size + 511) >> 9;
1440 * Now test for possible Rock Ridge extensions which will override
1441 * some of these numbers in the inode structure.
1445 parse_rock_ridge_inode(de, inode, relocated);
1446 /* if we want uid/gid set, override the rock ridge setting */
1448 inode->i_uid = sbi->s_uid;
1450 inode->i_gid = sbi->s_gid;
1452 /* Now set final access rights if overriding rock ridge setting */
1453 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1454 sbi->s_dmode != ISOFS_INVALID_MODE)
1455 inode->i_mode = S_IFDIR | sbi->s_dmode;
1456 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1457 sbi->s_fmode != ISOFS_INVALID_MODE)
1458 inode->i_mode = S_IFREG | sbi->s_fmode;
1460 /* Install the inode operations vector */
1461 if (S_ISREG(inode->i_mode)) {
1462 inode->i_fop = &generic_ro_fops;
1463 switch (ei->i_file_format) {
1464 #ifdef CONFIG_ZISOFS
1465 case isofs_file_compressed:
1466 inode->i_data.a_ops = &zisofs_aops;
1470 inode->i_data.a_ops = &isofs_aops;
1473 } else if (S_ISDIR(inode->i_mode)) {
1474 inode->i_op = &isofs_dir_inode_operations;
1475 inode->i_fop = &isofs_dir_operations;
1476 } else if (S_ISLNK(inode->i_mode)) {
1477 inode->i_op = &page_symlink_inode_operations;
1478 inode_nohighmem(inode);
1479 inode->i_data.a_ops = &isofs_symlink_aops;
1481 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1482 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1492 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1497 struct isofs_iget5_callback_data {
1498 unsigned long block;
1499 unsigned long offset;
1502 static int isofs_iget5_test(struct inode *ino, void *data)
1504 struct iso_inode_info *i = ISOFS_I(ino);
1505 struct isofs_iget5_callback_data *d =
1506 (struct isofs_iget5_callback_data*)data;
1507 return (i->i_iget5_block == d->block)
1508 && (i->i_iget5_offset == d->offset);
1511 static int isofs_iget5_set(struct inode *ino, void *data)
1513 struct iso_inode_info *i = ISOFS_I(ino);
1514 struct isofs_iget5_callback_data *d =
1515 (struct isofs_iget5_callback_data*)data;
1516 i->i_iget5_block = d->block;
1517 i->i_iget5_offset = d->offset;
1521 /* Store, in the inode's containing structure, the block and block
1522 * offset that point to the underlying meta-data for the inode. The
1523 * code below is otherwise similar to the iget() code in
1524 * include/linux/fs.h */
1525 struct inode *__isofs_iget(struct super_block *sb,
1526 unsigned long block,
1527 unsigned long offset,
1530 unsigned long hashval;
1531 struct inode *inode;
1532 struct isofs_iget5_callback_data data;
1535 if (offset >= 1ul << sb->s_blocksize_bits)
1536 return ERR_PTR(-EINVAL);
1539 data.offset = offset;
1541 hashval = (block << sb->s_blocksize_bits) | offset;
1543 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1544 &isofs_iget5_set, &data);
1547 return ERR_PTR(-ENOMEM);
1549 if (inode->i_state & I_NEW) {
1550 ret = isofs_read_inode(inode, relocated);
1553 inode = ERR_PTR(ret);
1555 unlock_new_inode(inode);
1562 static struct dentry *isofs_mount(struct file_system_type *fs_type,
1563 int flags, const char *dev_name, void *data)
1565 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1568 static struct file_system_type iso9660_fs_type = {
1569 .owner = THIS_MODULE,
1571 .mount = isofs_mount,
1572 .kill_sb = kill_block_super,
1573 .fs_flags = FS_REQUIRES_DEV,
1575 MODULE_ALIAS_FS("iso9660");
1576 MODULE_ALIAS("iso9660");
1578 static int __init init_iso9660_fs(void)
1580 int err = init_inodecache();
1583 #ifdef CONFIG_ZISOFS
1584 err = zisofs_init();
1588 err = register_filesystem(&iso9660_fs_type);
1593 #ifdef CONFIG_ZISOFS
1597 destroy_inodecache();
1602 static void __exit exit_iso9660_fs(void)
1604 unregister_filesystem(&iso9660_fs_type);
1605 #ifdef CONFIG_ZISOFS
1608 destroy_inodecache();
1611 module_init(init_iso9660_fs)
1612 module_exit(exit_iso9660_fs)
1613 MODULE_LICENSE("GPL");