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/mpage.h>
25 #include <linux/user_namespace.h>
26 #include <linux/seq_file.h>
27 #include <linux/blkdev.h>
28 #include <linux/fs_context.h>
29 #include <linux/fs_parser.h>
34 /* max tz offset is 13 hours */
35 #define MAX_TZ_OFFSET (52*15*60)
39 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
40 static int isofs_dentry_cmpi(const struct dentry *dentry,
41 unsigned int len, const char *str, const struct qstr *name);
44 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
45 static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
46 static int isofs_dentry_cmpi_ms(const struct dentry *dentry,
47 unsigned int len, const char *str, const struct qstr *name);
48 static int isofs_dentry_cmp_ms(const struct dentry *dentry,
49 unsigned int len, const char *str, const struct qstr *name);
52 static void isofs_put_super(struct super_block *sb)
54 struct isofs_sb_info *sbi = ISOFS_SB(sb);
57 unload_nls(sbi->s_nls_iocharset);
65 static int isofs_read_inode(struct inode *, int relocated);
66 static int isofs_statfs (struct dentry *, struct kstatfs *);
67 static int isofs_show_options(struct seq_file *, struct dentry *);
69 static struct kmem_cache *isofs_inode_cachep;
71 static struct inode *isofs_alloc_inode(struct super_block *sb)
73 struct iso_inode_info *ei;
74 ei = alloc_inode_sb(sb, isofs_inode_cachep, GFP_KERNEL);
77 return &ei->vfs_inode;
80 static void isofs_free_inode(struct inode *inode)
82 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
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|
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_reconfigure(struct fs_context *fc)
116 sync_filesystem(fc->root->d_sb);
117 if (!(fc->sb_flags & SB_RDONLY))
122 static const struct super_operations isofs_sops = {
123 .alloc_inode = isofs_alloc_inode,
124 .free_inode = isofs_free_inode,
125 .put_super = isofs_put_super,
126 .statfs = isofs_statfs,
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 isofs_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;
160 unsigned int blocksize;
172 * Compute the hash for the isofs name corresponding to the dentry.
175 isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
185 while (len && name[len-1] == '.')
189 hash = init_name_hash(dentry);
191 c = tolower(*name++);
192 hash = partial_name_hash(c, hash);
194 qstr->hash = end_name_hash(hash);
200 * Compare of two isofs names.
202 static int isofs_dentry_cmp_common(
203 unsigned int len, const char *str,
204 const struct qstr *name, int ms, int ci)
208 /* A filename cannot end in '.' or we treat it like it has none */
212 while (alen && name->name[alen-1] == '.')
214 while (blen && str[blen-1] == '.')
219 if (strncasecmp(name->name, str, alen) == 0)
222 if (strncmp(name->name, str, alen) == 0)
230 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
232 return isofs_hashi_common(dentry, qstr, 0);
236 isofs_dentry_cmpi(const struct dentry *dentry,
237 unsigned int len, const char *str, const struct qstr *name)
239 return isofs_dentry_cmp_common(len, str, name, 0, 1);
244 * Compute the hash for the isofs name corresponding to the dentry.
247 isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
255 while (len && name[len-1] == '.')
259 qstr->hash = full_name_hash(dentry, name, len);
265 isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
267 return isofs_hash_common(dentry, qstr, 1);
271 isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
273 return isofs_hashi_common(dentry, qstr, 1);
277 isofs_dentry_cmp_ms(const struct dentry *dentry,
278 unsigned int len, const char *str, const struct qstr *name)
280 return isofs_dentry_cmp_common(len, str, name, 1, 0);
284 isofs_dentry_cmpi_ms(const struct dentry *dentry,
285 unsigned int len, const char *str, const struct qstr *name)
287 return isofs_dentry_cmp_common(len, str, name, 1, 1);
292 Opt_block, Opt_check, Opt_cruft, Opt_gid, Opt_ignore, Opt_iocharset,
293 Opt_map, Opt_mode, Opt_nojoliet, Opt_norock, Opt_sb, Opt_session,
294 Opt_uid, Opt_unhide, Opt_utf8, Opt_err, Opt_nocompress, Opt_hide,
295 Opt_showassoc, Opt_dmode, Opt_overriderockperm,
298 static const struct constant_table isofs_param_map[] = {
308 static const struct constant_table isofs_param_check[] = {
316 static const struct fs_parameter_spec isofs_param_spec[] = {
317 fsparam_flag ("norock", Opt_norock),
318 fsparam_flag ("nojoliet", Opt_nojoliet),
319 fsparam_flag ("unhide", Opt_unhide),
320 fsparam_flag ("hide", Opt_hide),
321 fsparam_flag ("showassoc", Opt_showassoc),
322 fsparam_flag ("cruft", Opt_cruft),
323 fsparam_flag ("utf8", Opt_utf8),
324 fsparam_string ("iocharset", Opt_iocharset),
325 fsparam_enum ("map", Opt_map, isofs_param_map),
326 fsparam_u32 ("session", Opt_session),
327 fsparam_u32 ("sbsector", Opt_sb),
328 fsparam_enum ("check", Opt_check, isofs_param_check),
329 fsparam_u32 ("uid", Opt_uid),
330 fsparam_u32 ("gid", Opt_gid),
331 /* Note: mode/dmode historically accepted %u not strictly %o */
332 fsparam_u32 ("mode", Opt_mode),
333 fsparam_u32 ("dmode", Opt_dmode),
334 fsparam_flag ("overriderockperm", Opt_overriderockperm),
335 fsparam_u32 ("block", Opt_block),
336 fsparam_string ("conv", Opt_ignore),
337 fsparam_flag ("nocompress", Opt_nocompress),
341 static int isofs_parse_param(struct fs_context *fc,
342 struct fs_parameter *param)
344 struct isofs_options *popt = fc->fs_private;
345 struct fs_parse_result result;
351 /* There are no remountable options */
352 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
355 opt = fs_parse(fc, isofs_param_spec, param, &result);
378 kfree(popt->iocharset);
379 popt->iocharset = kstrdup("utf8", GFP_KERNEL);
380 if (!popt->iocharset)
384 kfree(popt->iocharset);
385 popt->iocharset = kstrdup(param->string, GFP_KERNEL);
386 if (!popt->iocharset)
391 popt->map = result.uint_32;
396 * Track numbers are supposed to be in range 1-99, the
397 * mount option starts indexing at 0.
401 popt->session = n + 1;
404 popt->sbsector = result.uint_32;
407 popt->check = result.uint_32;
412 uid = make_kuid(current_user_ns(), result.uint_32);
419 gid = make_kgid(current_user_ns(), result.uint_32);
426 popt->fmode = result.uint_32;
429 popt->dmode = result.uint_32;
431 case Opt_overriderockperm:
432 popt->overriderockperm = 1;
436 if (n != 512 && n != 1024 && n != 2048)
441 popt->nocompress = 1;
450 * Display the mount options in /proc/mounts.
452 static int isofs_show_options(struct seq_file *m, struct dentry *root)
454 struct isofs_sb_info *sbi = ISOFS_SB(root->d_sb);
456 if (!sbi->s_rock) seq_puts(m, ",norock");
457 else if (!sbi->s_joliet_level) seq_puts(m, ",nojoliet");
458 if (sbi->s_cruft) seq_puts(m, ",cruft");
459 if (sbi->s_hide) seq_puts(m, ",hide");
460 if (sbi->s_nocompress) seq_puts(m, ",nocompress");
461 if (sbi->s_overriderockperm) seq_puts(m, ",overriderockperm");
462 if (sbi->s_showassoc) seq_puts(m, ",showassoc");
464 if (sbi->s_check) seq_printf(m, ",check=%c", sbi->s_check);
465 if (sbi->s_mapping) seq_printf(m, ",map=%c", sbi->s_mapping);
466 if (sbi->s_session != 255) seq_printf(m, ",session=%u", sbi->s_session - 1);
467 if (sbi->s_sbsector != -1) seq_printf(m, ",sbsector=%u", sbi->s_sbsector);
469 if (root->d_sb->s_blocksize != 1024)
470 seq_printf(m, ",blocksize=%lu", root->d_sb->s_blocksize);
473 seq_printf(m, ",uid=%u",
474 from_kuid_munged(&init_user_ns, sbi->s_uid));
476 seq_printf(m, ",gid=%u",
477 from_kgid_munged(&init_user_ns, sbi->s_gid));
479 if (sbi->s_dmode != ISOFS_INVALID_MODE)
480 seq_printf(m, ",dmode=%o", sbi->s_dmode);
481 if (sbi->s_fmode != ISOFS_INVALID_MODE)
482 seq_printf(m, ",fmode=%o", sbi->s_fmode);
485 if (sbi->s_nls_iocharset)
486 seq_printf(m, ",iocharset=%s", sbi->s_nls_iocharset->charset);
488 seq_puts(m, ",iocharset=utf8");
494 * look if the driver can tell the multi session redirection value
496 * don't change this if you don't know what you do, please!
497 * Multisession is legal only with XA disks.
498 * A non-XA disk with more than one volume descriptor may do it right, but
499 * usually is written in a nowhere standardized "multi-partition" manner.
500 * Multisession uses absolute addressing (solely the first frame of the whole
501 * track is #0), multi-partition uses relative addressing (each first frame of
502 * each track is #0), and a track is not a session.
504 * A broken CDwriter software or drive firmware does not set new standards,
505 * at least not if conflicting with the existing ones.
509 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
511 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
513 struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
514 unsigned int vol_desc_start = 0;
517 struct cdrom_tocentry te;
522 te.cdte_track = session;
523 te.cdte_format = CDROM_LBA;
524 if (cdrom_read_tocentry(cdi, &te) == 0) {
525 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
526 session, te.cdte_addr.lba,
527 te.cdte_ctrl & CDROM_DATA_TRACK);
528 if ((te.cdte_ctrl & CDROM_DATA_TRACK) == 4)
529 return te.cdte_addr.lba;
532 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
536 struct cdrom_multisession ms_info;
538 ms_info.addr_format = CDROM_LBA;
539 if (cdrom_multisession(cdi, &ms_info) == 0) {
540 #if WE_OBEY_THE_WRITTEN_STANDARDS
541 /* necessary for a valid ms_info.addr */
544 vol_desc_start = ms_info.addr.lba;
548 return vol_desc_start;
552 * Check if root directory is empty (has less than 3 files).
554 * Used to detect broken CDs where ISO root directory is empty but Joliet root
555 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
556 * (and Joliet used instead) or else no files would be visible.
558 static bool rootdir_empty(struct super_block *sb, unsigned long block)
560 int offset = 0, files = 0, de_len;
561 struct iso_directory_record *de;
562 struct buffer_head *bh;
564 bh = sb_bread(sb, block);
568 de = (struct iso_directory_record *) (bh->b_data + offset);
569 de_len = *(unsigned char *) de;
580 * Initialize the superblock and read the root inode.
582 static int isofs_fill_super(struct super_block *s, struct fs_context *fc)
584 struct buffer_head *bh = NULL, *pri_bh = NULL;
585 struct hs_primary_descriptor *h_pri = NULL;
586 struct iso_primary_descriptor *pri = NULL;
587 struct iso_supplementary_descriptor *sec = NULL;
588 struct iso_directory_record *rootp;
590 struct isofs_options *opt = fc->fs_private;
591 struct isofs_sb_info *sbi;
592 unsigned long first_data_zone;
593 int joliet_level = 0;
594 int iso_blknum, block;
596 int table, error = -EINVAL;
597 unsigned int vol_desc_start;
598 int silent = fc->sb_flags & SB_SILENT;
600 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
606 * First of all, get the hardware blocksize for this device.
607 * If we don't know what it is, or the hardware blocksize is
608 * larger than the blocksize the user specified, then use
612 * What if bugger tells us to go beyond page size?
614 if (bdev_logical_block_size(s->s_bdev) > 2048) {
616 "ISOFS: unsupported/invalid hardware sector size %d\n",
617 bdev_logical_block_size(s->s_bdev));
620 opt->blocksize = sb_min_blocksize(s, opt->blocksize);
622 sbi->s_high_sierra = 0; /* default is iso9660 */
623 sbi->s_session = opt->session;
624 sbi->s_sbsector = opt->sbsector;
626 vol_desc_start = (opt->sbsector != -1) ?
627 opt->sbsector : isofs_get_last_session(s, opt->session);
629 for (iso_blknum = vol_desc_start+16;
630 iso_blknum < vol_desc_start+100; iso_blknum++) {
631 struct hs_volume_descriptor *hdp;
632 struct iso_volume_descriptor *vdp;
634 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
635 if (!(bh = sb_bread(s, block)))
638 vdp = (struct iso_volume_descriptor *)bh->b_data;
639 hdp = (struct hs_volume_descriptor *)bh->b_data;
642 * Due to the overlapping physical location of the descriptors,
643 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
644 * proper identification in this case, we first check for ISO.
646 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
647 if (isonum_711(vdp->type) == ISO_VD_END)
649 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
651 pri = (struct iso_primary_descriptor *)vdp;
652 /* Save the buffer in case we need it ... */
658 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
659 sec = (struct iso_supplementary_descriptor *)vdp;
660 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
662 if (sec->escape[2] == 0x40)
664 else if (sec->escape[2] == 0x43)
666 else if (sec->escape[2] == 0x45)
669 printk(KERN_DEBUG "ISO 9660 Extensions: "
670 "Microsoft Joliet Level %d\n",
675 /* Unknown supplementary volume descriptor */
681 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
682 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
685 sbi->s_high_sierra = 1;
687 h_pri = (struct hs_primary_descriptor *)vdp;
692 /* Just skip any volume descriptors we don't recognize */
698 * If we fall through, either no volume descriptor was found,
699 * or else we passed a primary descriptor looking for others.
702 goto out_unknown_format;
708 /* We don't support read-write mounts */
714 if (joliet_level && (!pri || !opt->rock)) {
715 /* This is the case of Joliet with the norock mount flag.
716 * A disc with both Joliet and Rock Ridge is handled later
718 pri = (struct iso_primary_descriptor *) sec;
721 if(sbi->s_high_sierra){
722 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
723 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
724 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
725 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
729 rootp = (struct iso_directory_record *) pri->root_directory_record;
730 sbi->s_nzones = isonum_733(pri->volume_space_size);
731 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
732 sbi->s_max_size = isonum_733(pri->volume_space_size);
735 sbi->s_ninodes = 0; /* No way to figure this out easily */
737 orig_zonesize = sbi->s_log_zone_size;
739 * If the zone size is smaller than the hardware sector size,
740 * this is a fatal error. This would occur if the disc drive
741 * had sectors that were 2048 bytes, but the filesystem had
742 * blocks that were 512 bytes (which should only very rarely
745 if (orig_zonesize < opt->blocksize)
748 /* RDE: convert log zone size to bit shift */
749 switch (sbi->s_log_zone_size) {
750 case 512: sbi->s_log_zone_size = 9; break;
751 case 1024: sbi->s_log_zone_size = 10; break;
752 case 2048: sbi->s_log_zone_size = 11; break;
755 goto out_bad_zone_size;
758 s->s_magic = ISOFS_SUPER_MAGIC;
761 * With multi-extent files, file size is only limited by the maximum
762 * size of a file system, which is 8 TB.
764 s->s_maxbytes = 0x80000000000LL;
766 /* ECMA-119 timestamp from 1900/1/1 with tz offset */
767 s->s_time_min = mktime64(1900, 1, 1, 0, 0, 0) - MAX_TZ_OFFSET;
768 s->s_time_max = mktime64(U8_MAX+1900, 12, 31, 23, 59, 59) + MAX_TZ_OFFSET;
770 /* Set this for reference. Its not currently used except on write
771 which we don't have .. */
773 first_data_zone = isonum_733(rootp->extent) +
774 isonum_711(rootp->ext_attr_length);
775 sbi->s_firstdatazone = first_data_zone;
777 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
778 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
779 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
780 if(sbi->s_high_sierra)
781 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
785 * If the Joliet level is set, we _may_ decide to use the
786 * secondary descriptor, but can't be sure until after we
787 * read the root inode. But before reading the root inode
788 * we may need to change the device blocksize, and would
789 * rather release the old buffer first. So, we cache the
790 * first_data_zone value from the secondary descriptor.
793 pri = (struct iso_primary_descriptor *) sec;
794 rootp = (struct iso_directory_record *)
795 pri->root_directory_record;
796 first_data_zone = isonum_733(rootp->extent) +
797 isonum_711(rootp->ext_attr_length);
801 * We're all done using the volume descriptor, and may need
802 * to change the device blocksize, so release the buffer now.
808 * Force the blocksize to 512 for 512 byte sectors. The file
809 * read primitives really get it wrong in a bad way if we don't
812 * Note - we should never be setting the blocksize to something
813 * less than the hardware sector size for the device. If we
814 * do, we would end up having to read larger buffers and split
815 * out portions to satisfy requests.
817 * Note2- the idea here is that we want to deal with the optimal
818 * zonesize in the filesystem. If we have it set to something less,
819 * then we have horrible problems with trying to piece together
820 * bits of adjacent blocks in order to properly read directory
821 * entries. By forcing the blocksize in this way, we ensure
822 * that we will never be required to do this.
824 sb_set_blocksize(s, orig_zonesize);
826 sbi->s_nls_iocharset = NULL;
830 char *p = opt->iocharset ? opt->iocharset : CONFIG_NLS_DEFAULT;
831 if (strcmp(p, "utf8") != 0) {
832 sbi->s_nls_iocharset = opt->iocharset ?
833 load_nls(opt->iocharset) : load_nls_default();
834 if (!sbi->s_nls_iocharset)
839 s->s_op = &isofs_sops;
840 s->s_export_op = &isofs_export_ops;
841 sbi->s_mapping = opt->map;
842 sbi->s_rock = (opt->rock ? 2 : 0);
843 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
844 sbi->s_cruft = opt->cruft;
845 sbi->s_hide = opt->hide;
846 sbi->s_showassoc = opt->showassoc;
847 sbi->s_uid = opt->uid;
848 sbi->s_gid = opt->gid;
849 sbi->s_uid_set = opt->uid_set;
850 sbi->s_gid_set = opt->gid_set;
851 sbi->s_nocompress = opt->nocompress;
852 sbi->s_overriderockperm = opt->overriderockperm;
854 * It would be incredibly stupid to allow people to mark every file
855 * on the disk as suid, so we merely allow them to set the default
858 if (opt->fmode != ISOFS_INVALID_MODE)
859 sbi->s_fmode = opt->fmode & 0777;
861 sbi->s_fmode = ISOFS_INVALID_MODE;
862 if (opt->dmode != ISOFS_INVALID_MODE)
863 sbi->s_dmode = opt->dmode & 0777;
865 sbi->s_dmode = ISOFS_INVALID_MODE;
868 * Read the root inode, which _may_ result in changing
869 * the s_rock flag. Once we have the final s_rock value,
870 * we then decide whether to use the Joliet descriptor.
872 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
875 * Fix for broken CDs with a corrupt root inode but a correct Joliet
879 if (joliet_level && sbi->s_firstdatazone != first_data_zone) {
881 "ISOFS: root inode is unusable. "
882 "Disabling Rock Ridge and switching to Joliet.");
891 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
892 * correct Joliet root directory.
894 if (sbi->s_rock == 1 && joliet_level &&
895 rootdir_empty(s, sbi->s_firstdatazone)) {
897 "ISOFS: primary root directory is empty. "
898 "Disabling Rock Ridge and switching to Joliet.");
903 * If this disk has both Rock Ridge and Joliet on it, then we
904 * want to use Rock Ridge by default. This can be overridden
905 * by using the norock mount option. There is still one other
906 * possibility that is not taken into account: a Rock Ridge
907 * CD with Unicode names. Until someone sees such a beast, it
908 * will not be supported.
910 if (sbi->s_rock == 1) {
912 } else if (joliet_level) {
914 if (sbi->s_firstdatazone != first_data_zone) {
915 sbi->s_firstdatazone = first_data_zone;
917 "ISOFS: changing to secondary root\n");
919 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
925 if (opt->check == 'u') {
926 /* Only Joliet is case insensitive by default */
932 sbi->s_joliet_level = joliet_level;
934 /* Make sure the root inode is a directory */
935 if (!S_ISDIR(inode->i_mode)) {
937 "isofs_fill_super: root inode is not a directory. "
938 "Corrupted media?\n");
945 if (opt->check == 'r')
947 sbi->s_check = opt->check;
950 s->s_d_op = &isofs_dentry_ops[table - 1];
952 /* get the root dentry */
953 s->s_root = d_make_root(inode);
959 kfree(opt->iocharset);
964 * Display error messages and free resources.
970 error = PTR_ERR(inode);
971 if (error != -ENOMEM)
972 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
975 unload_nls(sbi->s_nls_iocharset);
979 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
980 __func__, s->s_id, iso_blknum, block);
983 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
984 sbi->s_log_zone_size);
987 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
988 orig_zonesize, opt->blocksize);
992 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
998 kfree(opt->iocharset);
1000 s->s_fs_info = NULL;
1004 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
1006 struct super_block *sb = dentry->d_sb;
1007 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1009 buf->f_type = ISOFS_SUPER_MAGIC;
1010 buf->f_bsize = sb->s_blocksize;
1011 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
1012 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
1015 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1017 buf->f_fsid = u64_to_fsid(id);
1018 buf->f_namelen = NAME_MAX;
1023 * Get a set of blocks; filling in buffer_heads if already allocated
1024 * or getblk() if they are not. Returns the number of blocks inserted
1027 int isofs_get_blocks(struct inode *inode, sector_t iblock,
1028 struct buffer_head **bh, unsigned long nblocks)
1030 unsigned long b_off = iblock;
1031 unsigned offset, sect_size;
1032 unsigned int firstext;
1033 unsigned long nextblk, nextoff;
1034 int section, rv, error;
1035 struct iso_inode_info *ei = ISOFS_I(inode);
1039 if (iblock != b_off) {
1040 printk(KERN_DEBUG "%s: block number too large\n", __func__);
1046 firstext = ei->i_first_extent;
1047 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1048 nextblk = ei->i_next_section_block;
1049 nextoff = ei->i_next_section_offset;
1053 /* If we are *way* beyond the end of the file, print a message.
1054 * Access beyond the end of the file up to the next page boundary
1055 * is normal, however because of the way the page cache works.
1056 * In this case, we just return 0 so that we can properly fill
1057 * the page with useless information without generating any
1060 if (b_off > ((inode->i_size + PAGE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1061 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1063 (unsigned long long)inode->i_size);
1067 /* On the last section, nextblk == 0, section size is likely to
1068 * exceed sect_size by a partial block, and access beyond the
1069 * end of the file will reach beyond the section size, too.
1071 while (nextblk && (b_off >= (offset + sect_size))) {
1072 struct inode *ninode;
1074 offset += sect_size;
1075 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1076 if (IS_ERR(ninode)) {
1077 error = PTR_ERR(ninode);
1080 firstext = ISOFS_I(ninode)->i_first_extent;
1081 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1082 nextblk = ISOFS_I(ninode)->i_next_section_block;
1083 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1086 if (++section > 100) {
1087 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1088 " aborting...\n", __func__);
1089 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
1090 "nextblk=%lu nextoff=%lu\n", __func__,
1091 b_off, firstext, (unsigned) sect_size,
1098 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1100 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1104 bh++; /* Next buffer head */
1105 b_off++; /* Next buffer offset */
1112 return rv != 0 ? rv : error;
1116 * Used by the standard interfaces.
1118 static int isofs_get_block(struct inode *inode, sector_t iblock,
1119 struct buffer_head *bh_result, int create)
1124 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1128 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1129 return ret < 0 ? ret : 0;
1132 static int isofs_bmap(struct inode *inode, sector_t block)
1134 struct buffer_head dummy;
1138 dummy.b_blocknr = -1000;
1139 error = isofs_get_block(inode, block, &dummy, 0);
1141 return dummy.b_blocknr;
1145 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1147 sector_t blknr = isofs_bmap(inode, block);
1150 return sb_bread(inode->i_sb, blknr);
1153 static int isofs_read_folio(struct file *file, struct folio *folio)
1155 return mpage_read_folio(folio, isofs_get_block);
1158 static void isofs_readahead(struct readahead_control *rac)
1160 mpage_readahead(rac, isofs_get_block);
1163 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1165 return generic_block_bmap(mapping,block,isofs_get_block);
1168 static const struct address_space_operations isofs_aops = {
1169 .read_folio = isofs_read_folio,
1170 .readahead = isofs_readahead,
1174 static int isofs_read_level3_size(struct inode *inode)
1176 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1177 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1178 struct buffer_head *bh = NULL;
1179 unsigned long block, offset, block_saved, offset_saved;
1181 int more_entries = 0;
1182 struct iso_directory_record *tmpde = NULL;
1183 struct iso_inode_info *ei = ISOFS_I(inode);
1187 /* The first 16 blocks are reserved as the System Area. Thus,
1188 * no inodes can appear in block 0. We use this to flag that
1189 * this is the last section. */
1190 ei->i_next_section_block = 0;
1191 ei->i_next_section_offset = 0;
1193 block = ei->i_iget5_block;
1194 offset = ei->i_iget5_offset;
1197 struct iso_directory_record *de;
1198 unsigned int de_len;
1201 bh = sb_bread(inode->i_sb, block);
1205 de = (struct iso_directory_record *) (bh->b_data + offset);
1206 de_len = *(unsigned char *) de;
1216 block_saved = block;
1217 offset_saved = offset;
1220 /* Make sure we have a full directory entry */
1221 if (offset >= bufsize) {
1222 int slop = bufsize - offset + de_len;
1224 tmpde = kmalloc(256, GFP_KERNEL);
1228 memcpy(tmpde, de, slop);
1229 offset &= bufsize - 1;
1234 bh = sb_bread(inode->i_sb, block);
1237 memcpy((void *)tmpde+slop, bh->b_data, offset);
1242 inode->i_size += isonum_733(de->size);
1244 ei->i_next_section_block = block_saved;
1245 ei->i_next_section_offset = offset_saved;
1248 more_entries = de->flags[-high_sierra] & 0x80;
1253 } while (more_entries);
1264 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1269 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1270 "isofs_read_level3_size: inode=%lu\n",
1271 __func__, inode->i_ino);
1275 static int isofs_read_inode(struct inode *inode, int relocated)
1277 struct super_block *sb = inode->i_sb;
1278 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1279 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1280 unsigned long block;
1281 int high_sierra = sbi->s_high_sierra;
1282 struct buffer_head *bh;
1283 struct iso_directory_record *de;
1284 struct iso_directory_record *tmpde = NULL;
1285 unsigned int de_len;
1286 unsigned long offset;
1287 struct iso_inode_info *ei = ISOFS_I(inode);
1290 block = ei->i_iget5_block;
1291 bh = sb_bread(inode->i_sb, block);
1295 offset = ei->i_iget5_offset;
1297 de = (struct iso_directory_record *) (bh->b_data + offset);
1298 de_len = *(unsigned char *) de;
1299 if (de_len < sizeof(struct iso_directory_record))
1302 if (offset + de_len > bufsize) {
1303 int frag1 = bufsize - offset;
1305 tmpde = kmalloc(de_len, GFP_KERNEL);
1310 memcpy(tmpde, bh->b_data + offset, frag1);
1312 bh = sb_bread(inode->i_sb, ++block);
1315 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1319 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1321 ISOFS_BUFFER_BITS(inode));
1323 /* Assume it is a normal-format file unless told otherwise */
1324 ei->i_file_format = isofs_file_normal;
1326 if (de->flags[-high_sierra] & 2) {
1327 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1328 inode->i_mode = S_IFDIR | sbi->s_dmode;
1330 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1331 set_nlink(inode, 1); /*
1332 * Set to 1. We know there are 2, but
1333 * the find utility tries to optimize
1334 * if it is 2, and it screws up. It is
1335 * easier to give 1 which tells find to
1336 * do it the hard way.
1339 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1340 inode->i_mode = S_IFREG | sbi->s_fmode;
1343 * Set default permissions: r-x for all. The disc
1344 * could be shared with DOS machines so virtually
1345 * anything could be a valid executable.
1347 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1349 set_nlink(inode, 1);
1351 inode->i_uid = sbi->s_uid;
1352 inode->i_gid = sbi->s_gid;
1353 inode->i_blocks = 0;
1355 ei->i_format_parm[0] = 0;
1356 ei->i_format_parm[1] = 0;
1357 ei->i_format_parm[2] = 0;
1359 ei->i_section_size = isonum_733(de->size);
1360 if (de->flags[-high_sierra] & 0x80) {
1361 ret = isofs_read_level3_size(inode);
1366 ei->i_next_section_block = 0;
1367 ei->i_next_section_offset = 0;
1368 inode->i_size = isonum_733(de->size);
1372 * Some dipshit decided to store some other bit of information
1373 * in the high byte of the file length. Truncate size in case
1374 * this CDROM was mounted with the cruft option.
1378 inode->i_size &= 0x00ffffff;
1380 if (de->interleave[0]) {
1381 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1385 /* I have no idea what file_unit_size is used for, so
1386 we will flag it for now */
1387 if (de->file_unit_size[0] != 0) {
1388 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1392 /* I have no idea what other flag bits are used for, so
1393 we will flag it for now */
1395 if((de->flags[-high_sierra] & ~2)!= 0){
1396 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1398 inode->i_ino, de->flags[-high_sierra]);
1401 inode_set_mtime_to_ts(inode,
1402 inode_set_atime_to_ts(inode, inode_set_ctime(inode, iso_date(de->date, high_sierra), 0)));
1404 ei->i_first_extent = (isonum_733(de->extent) +
1405 isonum_711(de->ext_attr_length));
1407 /* Set the number of blocks for stat() - should be done before RR */
1408 inode->i_blocks = (inode->i_size + 511) >> 9;
1411 * Now test for possible Rock Ridge extensions which will override
1412 * some of these numbers in the inode structure.
1416 parse_rock_ridge_inode(de, inode, relocated);
1417 /* if we want uid/gid set, override the rock ridge setting */
1419 inode->i_uid = sbi->s_uid;
1421 inode->i_gid = sbi->s_gid;
1423 /* Now set final access rights if overriding rock ridge setting */
1424 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1425 sbi->s_dmode != ISOFS_INVALID_MODE)
1426 inode->i_mode = S_IFDIR | sbi->s_dmode;
1427 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1428 sbi->s_fmode != ISOFS_INVALID_MODE)
1429 inode->i_mode = S_IFREG | sbi->s_fmode;
1431 /* Install the inode operations vector */
1432 if (S_ISREG(inode->i_mode)) {
1433 inode->i_fop = &generic_ro_fops;
1434 switch (ei->i_file_format) {
1435 #ifdef CONFIG_ZISOFS
1436 case isofs_file_compressed:
1437 inode->i_data.a_ops = &zisofs_aops;
1441 inode->i_data.a_ops = &isofs_aops;
1444 } else if (S_ISDIR(inode->i_mode)) {
1445 inode->i_op = &isofs_dir_inode_operations;
1446 inode->i_fop = &isofs_dir_operations;
1447 } else if (S_ISLNK(inode->i_mode)) {
1448 inode->i_op = &page_symlink_inode_operations;
1449 inode_nohighmem(inode);
1450 inode->i_data.a_ops = &isofs_symlink_aops;
1452 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1453 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1462 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1467 struct isofs_iget5_callback_data {
1468 unsigned long block;
1469 unsigned long offset;
1472 static int isofs_iget5_test(struct inode *ino, void *data)
1474 struct iso_inode_info *i = ISOFS_I(ino);
1475 struct isofs_iget5_callback_data *d =
1476 (struct isofs_iget5_callback_data*)data;
1477 return (i->i_iget5_block == d->block)
1478 && (i->i_iget5_offset == d->offset);
1481 static int isofs_iget5_set(struct inode *ino, void *data)
1483 struct iso_inode_info *i = ISOFS_I(ino);
1484 struct isofs_iget5_callback_data *d =
1485 (struct isofs_iget5_callback_data*)data;
1486 i->i_iget5_block = d->block;
1487 i->i_iget5_offset = d->offset;
1491 /* Store, in the inode's containing structure, the block and block
1492 * offset that point to the underlying meta-data for the inode. The
1493 * code below is otherwise similar to the iget() code in
1494 * include/linux/fs.h */
1495 struct inode *__isofs_iget(struct super_block *sb,
1496 unsigned long block,
1497 unsigned long offset,
1500 unsigned long hashval;
1501 struct inode *inode;
1502 struct isofs_iget5_callback_data data;
1505 if (offset >= 1ul << sb->s_blocksize_bits)
1506 return ERR_PTR(-EINVAL);
1509 data.offset = offset;
1511 hashval = (block << sb->s_blocksize_bits) | offset;
1513 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1514 &isofs_iget5_set, &data);
1517 return ERR_PTR(-ENOMEM);
1519 if (inode->i_state & I_NEW) {
1520 ret = isofs_read_inode(inode, relocated);
1523 inode = ERR_PTR(ret);
1525 unlock_new_inode(inode);
1532 static int isofs_get_tree(struct fs_context *fc)
1534 return get_tree_bdev(fc, isofs_fill_super);
1537 static void isofs_free_fc(struct fs_context *fc)
1539 kfree(fc->fs_private);
1542 static const struct fs_context_operations isofs_context_ops = {
1543 .parse_param = isofs_parse_param,
1544 .get_tree = isofs_get_tree,
1545 .reconfigure = isofs_reconfigure,
1546 .free = isofs_free_fc,
1549 static int isofs_init_fs_context(struct fs_context *fc)
1551 struct isofs_options *opt;
1553 opt = kzalloc(sizeof(*opt), GFP_KERNEL);
1563 opt->check = 'u'; /* unset */
1564 opt->nocompress = 0;
1565 opt->blocksize = 1024;
1566 opt->fmode = opt->dmode = ISOFS_INVALID_MODE;
1569 opt->gid = GLOBAL_ROOT_GID;
1570 opt->uid = GLOBAL_ROOT_UID;
1571 opt->iocharset = NULL;
1572 opt->overriderockperm = 0;
1576 fc->fs_private = opt;
1577 fc->ops = &isofs_context_ops;
1582 static struct file_system_type iso9660_fs_type = {
1583 .owner = THIS_MODULE,
1585 .kill_sb = kill_block_super,
1586 .fs_flags = FS_REQUIRES_DEV,
1587 .init_fs_context = isofs_init_fs_context,
1588 .parameters = isofs_param_spec,
1590 MODULE_ALIAS_FS("iso9660");
1591 MODULE_ALIAS("iso9660");
1593 static int __init init_iso9660_fs(void)
1595 int err = init_inodecache();
1598 #ifdef CONFIG_ZISOFS
1599 err = zisofs_init();
1603 err = register_filesystem(&iso9660_fs_type);
1608 #ifdef CONFIG_ZISOFS
1612 destroy_inodecache();
1617 static void __exit exit_iso9660_fs(void)
1619 unregister_filesystem(&iso9660_fs_type);
1620 #ifdef CONFIG_ZISOFS
1623 destroy_inodecache();
1626 module_init(init_iso9660_fs)
1627 module_exit(exit_iso9660_fs)
1628 MODULE_LICENSE("GPL");